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12458ea0 AG |
1 | /* |
2 | * Copyright (C) 2006-2009 DENX Software Engineering. | |
3 | * | |
4 | * Author: Yuri Tikhonov <yur@emcraft.com> | |
5 | * | |
6 | * Further porting to arch/powerpc by | |
7 | * Anatolij Gustschin <agust@denx.de> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify it | |
10 | * under the terms of the GNU General Public License as published by the Free | |
11 | * Software Foundation; either version 2 of the License, or (at your option) | |
12 | * any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
15 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
16 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
17 | * more details. | |
18 | * | |
12458ea0 AG |
19 | * The full GNU General Public License is included in this distribution in the |
20 | * file called COPYING. | |
21 | */ | |
22 | ||
23 | /* | |
24 | * This driver supports the asynchrounous DMA copy and RAID engines available | |
25 | * on the AMCC PPC440SPe Processors. | |
26 | * Based on the Intel Xscale(R) family of I/O Processors (IOP 32x, 33x, 134x) | |
27 | * ADMA driver written by D.Williams. | |
28 | */ | |
29 | ||
30 | #include <linux/init.h> | |
31 | #include <linux/module.h> | |
32 | #include <linux/async_tx.h> | |
33 | #include <linux/delay.h> | |
34 | #include <linux/dma-mapping.h> | |
35 | #include <linux/spinlock.h> | |
36 | #include <linux/interrupt.h> | |
5a0e3ad6 | 37 | #include <linux/slab.h> |
12458ea0 AG |
38 | #include <linux/uaccess.h> |
39 | #include <linux/proc_fs.h> | |
40 | #include <linux/of.h> | |
c11eede6 RH |
41 | #include <linux/of_address.h> |
42 | #include <linux/of_irq.h> | |
12458ea0 AG |
43 | #include <linux/of_platform.h> |
44 | #include <asm/dcr.h> | |
45 | #include <asm/dcr-regs.h> | |
46 | #include "adma.h" | |
d2ebfb33 | 47 | #include "../dmaengine.h" |
12458ea0 AG |
48 | |
49 | enum ppc_adma_init_code { | |
50 | PPC_ADMA_INIT_OK = 0, | |
51 | PPC_ADMA_INIT_MEMRES, | |
52 | PPC_ADMA_INIT_MEMREG, | |
53 | PPC_ADMA_INIT_ALLOC, | |
54 | PPC_ADMA_INIT_COHERENT, | |
55 | PPC_ADMA_INIT_CHANNEL, | |
56 | PPC_ADMA_INIT_IRQ1, | |
57 | PPC_ADMA_INIT_IRQ2, | |
58 | PPC_ADMA_INIT_REGISTER | |
59 | }; | |
60 | ||
61 | static char *ppc_adma_errors[] = { | |
62 | [PPC_ADMA_INIT_OK] = "ok", | |
63 | [PPC_ADMA_INIT_MEMRES] = "failed to get memory resource", | |
64 | [PPC_ADMA_INIT_MEMREG] = "failed to request memory region", | |
65 | [PPC_ADMA_INIT_ALLOC] = "failed to allocate memory for adev " | |
66 | "structure", | |
67 | [PPC_ADMA_INIT_COHERENT] = "failed to allocate coherent memory for " | |
68 | "hardware descriptors", | |
69 | [PPC_ADMA_INIT_CHANNEL] = "failed to allocate memory for channel", | |
70 | [PPC_ADMA_INIT_IRQ1] = "failed to request first irq", | |
71 | [PPC_ADMA_INIT_IRQ2] = "failed to request second irq", | |
72 | [PPC_ADMA_INIT_REGISTER] = "failed to register dma async device", | |
73 | }; | |
74 | ||
75 | static enum ppc_adma_init_code | |
76 | ppc440spe_adma_devices[PPC440SPE_ADMA_ENGINES_NUM]; | |
77 | ||
78 | struct ppc_dma_chan_ref { | |
79 | struct dma_chan *chan; | |
80 | struct list_head node; | |
81 | }; | |
82 | ||
83 | /* The list of channels exported by ppc440spe ADMA */ | |
84 | struct list_head | |
85 | ppc440spe_adma_chan_list = LIST_HEAD_INIT(ppc440spe_adma_chan_list); | |
86 | ||
87 | /* This flag is set when want to refetch the xor chain in the interrupt | |
88 | * handler | |
89 | */ | |
90 | static u32 do_xor_refetch; | |
91 | ||
92 | /* Pointer to DMA0, DMA1 CP/CS FIFO */ | |
93 | static void *ppc440spe_dma_fifo_buf; | |
94 | ||
95 | /* Pointers to last submitted to DMA0, DMA1 CDBs */ | |
96 | static struct ppc440spe_adma_desc_slot *chan_last_sub[3]; | |
97 | static struct ppc440spe_adma_desc_slot *chan_first_cdb[3]; | |
98 | ||
99 | /* Pointer to last linked and submitted xor CB */ | |
100 | static struct ppc440spe_adma_desc_slot *xor_last_linked; | |
101 | static struct ppc440spe_adma_desc_slot *xor_last_submit; | |
102 | ||
103 | /* This array is used in data-check operations for storing a pattern */ | |
104 | static char ppc440spe_qword[16]; | |
105 | ||
106 | static atomic_t ppc440spe_adma_err_irq_ref; | |
107 | static dcr_host_t ppc440spe_mq_dcr_host; | |
108 | static unsigned int ppc440spe_mq_dcr_len; | |
109 | ||
110 | /* Since RXOR operations use the common register (MQ0_CF2H) for setting-up | |
111 | * the block size in transactions, then we do not allow to activate more than | |
112 | * only one RXOR transactions simultaneously. So use this var to store | |
113 | * the information about is RXOR currently active (PPC440SPE_RXOR_RUN bit is | |
114 | * set) or not (PPC440SPE_RXOR_RUN is clear). | |
115 | */ | |
116 | static unsigned long ppc440spe_rxor_state; | |
117 | ||
118 | /* These are used in enable & check routines | |
119 | */ | |
120 | static u32 ppc440spe_r6_enabled; | |
121 | static struct ppc440spe_adma_chan *ppc440spe_r6_tchan; | |
122 | static struct completion ppc440spe_r6_test_comp; | |
123 | ||
124 | static int ppc440spe_adma_dma2rxor_prep_src( | |
125 | struct ppc440spe_adma_desc_slot *desc, | |
126 | struct ppc440spe_rxor *cursor, int index, | |
127 | int src_cnt, u32 addr); | |
128 | static void ppc440spe_adma_dma2rxor_set_src( | |
129 | struct ppc440spe_adma_desc_slot *desc, | |
130 | int index, dma_addr_t addr); | |
131 | static void ppc440spe_adma_dma2rxor_set_mult( | |
132 | struct ppc440spe_adma_desc_slot *desc, | |
133 | int index, u8 mult); | |
134 | ||
135 | #ifdef ADMA_LL_DEBUG | |
136 | #define ADMA_LL_DBG(x) ({ if (1) x; 0; }) | |
137 | #else | |
138 | #define ADMA_LL_DBG(x) ({ if (0) x; 0; }) | |
139 | #endif | |
140 | ||
141 | static void print_cb(struct ppc440spe_adma_chan *chan, void *block) | |
142 | { | |
143 | struct dma_cdb *cdb; | |
144 | struct xor_cb *cb; | |
145 | int i; | |
146 | ||
147 | switch (chan->device->id) { | |
148 | case 0: | |
149 | case 1: | |
150 | cdb = block; | |
151 | ||
152 | pr_debug("CDB at %p [%d]:\n" | |
153 | "\t attr 0x%02x opc 0x%02x cnt 0x%08x\n" | |
154 | "\t sg1u 0x%08x sg1l 0x%08x\n" | |
155 | "\t sg2u 0x%08x sg2l 0x%08x\n" | |
156 | "\t sg3u 0x%08x sg3l 0x%08x\n", | |
157 | cdb, chan->device->id, | |
158 | cdb->attr, cdb->opc, le32_to_cpu(cdb->cnt), | |
159 | le32_to_cpu(cdb->sg1u), le32_to_cpu(cdb->sg1l), | |
160 | le32_to_cpu(cdb->sg2u), le32_to_cpu(cdb->sg2l), | |
161 | le32_to_cpu(cdb->sg3u), le32_to_cpu(cdb->sg3l) | |
162 | ); | |
163 | break; | |
164 | case 2: | |
165 | cb = block; | |
166 | ||
167 | pr_debug("CB at %p [%d]:\n" | |
168 | "\t cbc 0x%08x cbbc 0x%08x cbs 0x%08x\n" | |
169 | "\t cbtah 0x%08x cbtal 0x%08x\n" | |
170 | "\t cblah 0x%08x cblal 0x%08x\n", | |
171 | cb, chan->device->id, | |
172 | cb->cbc, cb->cbbc, cb->cbs, | |
173 | cb->cbtah, cb->cbtal, | |
174 | cb->cblah, cb->cblal); | |
175 | for (i = 0; i < 16; i++) { | |
176 | if (i && !cb->ops[i].h && !cb->ops[i].l) | |
177 | continue; | |
178 | pr_debug("\t ops[%2d]: h 0x%08x l 0x%08x\n", | |
179 | i, cb->ops[i].h, cb->ops[i].l); | |
180 | } | |
181 | break; | |
182 | } | |
183 | } | |
184 | ||
185 | static void print_cb_list(struct ppc440spe_adma_chan *chan, | |
186 | struct ppc440spe_adma_desc_slot *iter) | |
187 | { | |
188 | for (; iter; iter = iter->hw_next) | |
189 | print_cb(chan, iter->hw_desc); | |
190 | } | |
191 | ||
192 | static void prep_dma_xor_dbg(int id, dma_addr_t dst, dma_addr_t *src, | |
193 | unsigned int src_cnt) | |
194 | { | |
195 | int i; | |
196 | ||
197 | pr_debug("\n%s(%d):\nsrc: ", __func__, id); | |
198 | for (i = 0; i < src_cnt; i++) | |
199 | pr_debug("\t0x%016llx ", src[i]); | |
200 | pr_debug("dst:\n\t0x%016llx\n", dst); | |
201 | } | |
202 | ||
203 | static void prep_dma_pq_dbg(int id, dma_addr_t *dst, dma_addr_t *src, | |
204 | unsigned int src_cnt) | |
205 | { | |
206 | int i; | |
207 | ||
208 | pr_debug("\n%s(%d):\nsrc: ", __func__, id); | |
209 | for (i = 0; i < src_cnt; i++) | |
210 | pr_debug("\t0x%016llx ", src[i]); | |
211 | pr_debug("dst: "); | |
212 | for (i = 0; i < 2; i++) | |
213 | pr_debug("\t0x%016llx ", dst[i]); | |
214 | } | |
215 | ||
216 | static void prep_dma_pqzero_sum_dbg(int id, dma_addr_t *src, | |
217 | unsigned int src_cnt, | |
218 | const unsigned char *scf) | |
219 | { | |
220 | int i; | |
221 | ||
222 | pr_debug("\n%s(%d):\nsrc(coef): ", __func__, id); | |
223 | if (scf) { | |
224 | for (i = 0; i < src_cnt; i++) | |
225 | pr_debug("\t0x%016llx(0x%02x) ", src[i], scf[i]); | |
226 | } else { | |
227 | for (i = 0; i < src_cnt; i++) | |
228 | pr_debug("\t0x%016llx(no) ", src[i]); | |
229 | } | |
230 | ||
231 | pr_debug("dst: "); | |
232 | for (i = 0; i < 2; i++) | |
233 | pr_debug("\t0x%016llx ", src[src_cnt + i]); | |
234 | } | |
235 | ||
236 | /****************************************************************************** | |
237 | * Command (Descriptor) Blocks low-level routines | |
238 | ******************************************************************************/ | |
239 | /** | |
240 | * ppc440spe_desc_init_interrupt - initialize the descriptor for INTERRUPT | |
241 | * pseudo operation | |
242 | */ | |
243 | static void ppc440spe_desc_init_interrupt(struct ppc440spe_adma_desc_slot *desc, | |
244 | struct ppc440spe_adma_chan *chan) | |
245 | { | |
246 | struct xor_cb *p; | |
247 | ||
248 | switch (chan->device->id) { | |
249 | case PPC440SPE_XOR_ID: | |
250 | p = desc->hw_desc; | |
251 | memset(desc->hw_desc, 0, sizeof(struct xor_cb)); | |
252 | /* NOP with Command Block Complete Enable */ | |
253 | p->cbc = XOR_CBCR_CBCE_BIT; | |
254 | break; | |
255 | case PPC440SPE_DMA0_ID: | |
256 | case PPC440SPE_DMA1_ID: | |
257 | memset(desc->hw_desc, 0, sizeof(struct dma_cdb)); | |
258 | /* NOP with interrupt */ | |
259 | set_bit(PPC440SPE_DESC_INT, &desc->flags); | |
260 | break; | |
261 | default: | |
262 | printk(KERN_ERR "Unsupported id %d in %s\n", chan->device->id, | |
263 | __func__); | |
264 | break; | |
265 | } | |
266 | } | |
267 | ||
268 | /** | |
269 | * ppc440spe_desc_init_null_xor - initialize the descriptor for NULL XOR | |
270 | * pseudo operation | |
271 | */ | |
272 | static void ppc440spe_desc_init_null_xor(struct ppc440spe_adma_desc_slot *desc) | |
273 | { | |
274 | memset(desc->hw_desc, 0, sizeof(struct xor_cb)); | |
275 | desc->hw_next = NULL; | |
276 | desc->src_cnt = 0; | |
277 | desc->dst_cnt = 1; | |
278 | } | |
279 | ||
280 | /** | |
281 | * ppc440spe_desc_init_xor - initialize the descriptor for XOR operation | |
282 | */ | |
283 | static void ppc440spe_desc_init_xor(struct ppc440spe_adma_desc_slot *desc, | |
284 | int src_cnt, unsigned long flags) | |
285 | { | |
286 | struct xor_cb *hw_desc = desc->hw_desc; | |
287 | ||
288 | memset(desc->hw_desc, 0, sizeof(struct xor_cb)); | |
289 | desc->hw_next = NULL; | |
290 | desc->src_cnt = src_cnt; | |
291 | desc->dst_cnt = 1; | |
292 | ||
293 | hw_desc->cbc = XOR_CBCR_TGT_BIT | src_cnt; | |
294 | if (flags & DMA_PREP_INTERRUPT) | |
295 | /* Enable interrupt on completion */ | |
296 | hw_desc->cbc |= XOR_CBCR_CBCE_BIT; | |
297 | } | |
298 | ||
299 | /** | |
300 | * ppc440spe_desc_init_dma2pq - initialize the descriptor for PQ | |
301 | * operation in DMA2 controller | |
302 | */ | |
303 | static void ppc440spe_desc_init_dma2pq(struct ppc440spe_adma_desc_slot *desc, | |
304 | int dst_cnt, int src_cnt, unsigned long flags) | |
305 | { | |
306 | struct xor_cb *hw_desc = desc->hw_desc; | |
307 | ||
308 | memset(desc->hw_desc, 0, sizeof(struct xor_cb)); | |
309 | desc->hw_next = NULL; | |
310 | desc->src_cnt = src_cnt; | |
311 | desc->dst_cnt = dst_cnt; | |
312 | memset(desc->reverse_flags, 0, sizeof(desc->reverse_flags)); | |
313 | desc->descs_per_op = 0; | |
314 | ||
315 | hw_desc->cbc = XOR_CBCR_TGT_BIT; | |
316 | if (flags & DMA_PREP_INTERRUPT) | |
317 | /* Enable interrupt on completion */ | |
318 | hw_desc->cbc |= XOR_CBCR_CBCE_BIT; | |
319 | } | |
320 | ||
321 | #define DMA_CTRL_FLAGS_LAST DMA_PREP_FENCE | |
322 | #define DMA_PREP_ZERO_P (DMA_CTRL_FLAGS_LAST << 1) | |
323 | #define DMA_PREP_ZERO_Q (DMA_PREP_ZERO_P << 1) | |
324 | ||
325 | /** | |
326 | * ppc440spe_desc_init_dma01pq - initialize the descriptors for PQ operation | |
327 | * with DMA0/1 | |
328 | */ | |
329 | static void ppc440spe_desc_init_dma01pq(struct ppc440spe_adma_desc_slot *desc, | |
330 | int dst_cnt, int src_cnt, unsigned long flags, | |
331 | unsigned long op) | |
332 | { | |
333 | struct dma_cdb *hw_desc; | |
334 | struct ppc440spe_adma_desc_slot *iter; | |
335 | u8 dopc; | |
336 | ||
337 | /* Common initialization of a PQ descriptors chain */ | |
338 | set_bits(op, &desc->flags); | |
339 | desc->src_cnt = src_cnt; | |
340 | desc->dst_cnt = dst_cnt; | |
341 | ||
342 | /* WXOR MULTICAST if both P and Q are being computed | |
343 | * MV_SG1_SG2 if Q only | |
344 | */ | |
345 | dopc = (desc->dst_cnt == DMA_DEST_MAX_NUM) ? | |
346 | DMA_CDB_OPC_MULTICAST : DMA_CDB_OPC_MV_SG1_SG2; | |
347 | ||
348 | list_for_each_entry(iter, &desc->group_list, chain_node) { | |
349 | hw_desc = iter->hw_desc; | |
350 | memset(iter->hw_desc, 0, sizeof(struct dma_cdb)); | |
351 | ||
352 | if (likely(!list_is_last(&iter->chain_node, | |
353 | &desc->group_list))) { | |
354 | /* set 'next' pointer */ | |
355 | iter->hw_next = list_entry(iter->chain_node.next, | |
356 | struct ppc440spe_adma_desc_slot, chain_node); | |
357 | clear_bit(PPC440SPE_DESC_INT, &iter->flags); | |
358 | } else { | |
359 | /* this is the last descriptor. | |
360 | * this slot will be pasted from ADMA level | |
361 | * each time it wants to configure parameters | |
362 | * of the transaction (src, dst, ...) | |
363 | */ | |
364 | iter->hw_next = NULL; | |
365 | if (flags & DMA_PREP_INTERRUPT) | |
366 | set_bit(PPC440SPE_DESC_INT, &iter->flags); | |
367 | else | |
368 | clear_bit(PPC440SPE_DESC_INT, &iter->flags); | |
369 | } | |
370 | } | |
371 | ||
372 | /* Set OPS depending on WXOR/RXOR type of operation */ | |
373 | if (!test_bit(PPC440SPE_DESC_RXOR, &desc->flags)) { | |
374 | /* This is a WXOR only chain: | |
375 | * - first descriptors are for zeroing destinations | |
376 | * if PPC440SPE_ZERO_P/Q set; | |
377 | * - descriptors remained are for GF-XOR operations. | |
378 | */ | |
379 | iter = list_first_entry(&desc->group_list, | |
380 | struct ppc440spe_adma_desc_slot, | |
381 | chain_node); | |
382 | ||
383 | if (test_bit(PPC440SPE_ZERO_P, &desc->flags)) { | |
384 | hw_desc = iter->hw_desc; | |
385 | hw_desc->opc = DMA_CDB_OPC_MV_SG1_SG2; | |
386 | iter = list_first_entry(&iter->chain_node, | |
387 | struct ppc440spe_adma_desc_slot, | |
388 | chain_node); | |
389 | } | |
390 | ||
391 | if (test_bit(PPC440SPE_ZERO_Q, &desc->flags)) { | |
392 | hw_desc = iter->hw_desc; | |
393 | hw_desc->opc = DMA_CDB_OPC_MV_SG1_SG2; | |
394 | iter = list_first_entry(&iter->chain_node, | |
395 | struct ppc440spe_adma_desc_slot, | |
396 | chain_node); | |
397 | } | |
398 | ||
399 | list_for_each_entry_from(iter, &desc->group_list, chain_node) { | |
400 | hw_desc = iter->hw_desc; | |
401 | hw_desc->opc = dopc; | |
402 | } | |
403 | } else { | |
404 | /* This is either RXOR-only or mixed RXOR/WXOR */ | |
405 | ||
406 | /* The first 1 or 2 slots in chain are always RXOR, | |
407 | * if need to calculate P & Q, then there are two | |
408 | * RXOR slots; if only P or only Q, then there is one | |
409 | */ | |
410 | iter = list_first_entry(&desc->group_list, | |
411 | struct ppc440spe_adma_desc_slot, | |
412 | chain_node); | |
413 | hw_desc = iter->hw_desc; | |
414 | hw_desc->opc = DMA_CDB_OPC_MV_SG1_SG2; | |
415 | ||
416 | if (desc->dst_cnt == DMA_DEST_MAX_NUM) { | |
417 | iter = list_first_entry(&iter->chain_node, | |
418 | struct ppc440spe_adma_desc_slot, | |
419 | chain_node); | |
420 | hw_desc = iter->hw_desc; | |
421 | hw_desc->opc = DMA_CDB_OPC_MV_SG1_SG2; | |
422 | } | |
423 | ||
424 | /* The remaining descs (if any) are WXORs */ | |
425 | if (test_bit(PPC440SPE_DESC_WXOR, &desc->flags)) { | |
426 | iter = list_first_entry(&iter->chain_node, | |
427 | struct ppc440spe_adma_desc_slot, | |
428 | chain_node); | |
429 | list_for_each_entry_from(iter, &desc->group_list, | |
430 | chain_node) { | |
431 | hw_desc = iter->hw_desc; | |
432 | hw_desc->opc = dopc; | |
433 | } | |
434 | } | |
435 | } | |
436 | } | |
437 | ||
438 | /** | |
439 | * ppc440spe_desc_init_dma01pqzero_sum - initialize the descriptor | |
440 | * for PQ_ZERO_SUM operation | |
441 | */ | |
442 | static void ppc440spe_desc_init_dma01pqzero_sum( | |
443 | struct ppc440spe_adma_desc_slot *desc, | |
444 | int dst_cnt, int src_cnt) | |
445 | { | |
446 | struct dma_cdb *hw_desc; | |
447 | struct ppc440spe_adma_desc_slot *iter; | |
448 | int i = 0; | |
449 | u8 dopc = (dst_cnt == 2) ? DMA_CDB_OPC_MULTICAST : | |
450 | DMA_CDB_OPC_MV_SG1_SG2; | |
451 | /* | |
452 | * Initialize starting from 2nd or 3rd descriptor dependent | |
453 | * on dst_cnt. First one or two slots are for cloning P | |
454 | * and/or Q to chan->pdest and/or chan->qdest as we have | |
455 | * to preserve original P/Q. | |
456 | */ | |
457 | iter = list_first_entry(&desc->group_list, | |
458 | struct ppc440spe_adma_desc_slot, chain_node); | |
459 | iter = list_entry(iter->chain_node.next, | |
460 | struct ppc440spe_adma_desc_slot, chain_node); | |
461 | ||
462 | if (dst_cnt > 1) { | |
463 | iter = list_entry(iter->chain_node.next, | |
464 | struct ppc440spe_adma_desc_slot, chain_node); | |
465 | } | |
466 | /* initialize each source descriptor in chain */ | |
467 | list_for_each_entry_from(iter, &desc->group_list, chain_node) { | |
468 | hw_desc = iter->hw_desc; | |
469 | memset(iter->hw_desc, 0, sizeof(struct dma_cdb)); | |
470 | iter->src_cnt = 0; | |
471 | iter->dst_cnt = 0; | |
472 | ||
473 | /* This is a ZERO_SUM operation: | |
474 | * - <src_cnt> descriptors starting from 2nd or 3rd | |
475 | * descriptor are for GF-XOR operations; | |
476 | * - remaining <dst_cnt> descriptors are for checking the result | |
477 | */ | |
478 | if (i++ < src_cnt) | |
479 | /* MV_SG1_SG2 if only Q is being verified | |
480 | * MULTICAST if both P and Q are being verified | |
481 | */ | |
482 | hw_desc->opc = dopc; | |
483 | else | |
484 | /* DMA_CDB_OPC_DCHECK128 operation */ | |
485 | hw_desc->opc = DMA_CDB_OPC_DCHECK128; | |
486 | ||
487 | if (likely(!list_is_last(&iter->chain_node, | |
488 | &desc->group_list))) { | |
489 | /* set 'next' pointer */ | |
490 | iter->hw_next = list_entry(iter->chain_node.next, | |
491 | struct ppc440spe_adma_desc_slot, | |
492 | chain_node); | |
493 | } else { | |
494 | /* this is the last descriptor. | |
495 | * this slot will be pasted from ADMA level | |
496 | * each time it wants to configure parameters | |
497 | * of the transaction (src, dst, ...) | |
498 | */ | |
499 | iter->hw_next = NULL; | |
500 | /* always enable interrupt generation since we get | |
501 | * the status of pqzero from the handler | |
502 | */ | |
503 | set_bit(PPC440SPE_DESC_INT, &iter->flags); | |
504 | } | |
505 | } | |
506 | desc->src_cnt = src_cnt; | |
507 | desc->dst_cnt = dst_cnt; | |
508 | } | |
509 | ||
510 | /** | |
511 | * ppc440spe_desc_init_memcpy - initialize the descriptor for MEMCPY operation | |
512 | */ | |
513 | static void ppc440spe_desc_init_memcpy(struct ppc440spe_adma_desc_slot *desc, | |
514 | unsigned long flags) | |
515 | { | |
516 | struct dma_cdb *hw_desc = desc->hw_desc; | |
517 | ||
518 | memset(desc->hw_desc, 0, sizeof(struct dma_cdb)); | |
519 | desc->hw_next = NULL; | |
520 | desc->src_cnt = 1; | |
521 | desc->dst_cnt = 1; | |
522 | ||
523 | if (flags & DMA_PREP_INTERRUPT) | |
524 | set_bit(PPC440SPE_DESC_INT, &desc->flags); | |
525 | else | |
526 | clear_bit(PPC440SPE_DESC_INT, &desc->flags); | |
527 | ||
528 | hw_desc->opc = DMA_CDB_OPC_MV_SG1_SG2; | |
529 | } | |
530 | ||
12458ea0 AG |
531 | /** |
532 | * ppc440spe_desc_set_src_addr - set source address into the descriptor | |
533 | */ | |
534 | static void ppc440spe_desc_set_src_addr(struct ppc440spe_adma_desc_slot *desc, | |
535 | struct ppc440spe_adma_chan *chan, | |
536 | int src_idx, dma_addr_t addrh, | |
537 | dma_addr_t addrl) | |
538 | { | |
539 | struct dma_cdb *dma_hw_desc; | |
540 | struct xor_cb *xor_hw_desc; | |
541 | phys_addr_t addr64, tmplow, tmphi; | |
542 | ||
543 | switch (chan->device->id) { | |
544 | case PPC440SPE_DMA0_ID: | |
545 | case PPC440SPE_DMA1_ID: | |
546 | if (!addrh) { | |
547 | addr64 = addrl; | |
548 | tmphi = (addr64 >> 32); | |
549 | tmplow = (addr64 & 0xFFFFFFFF); | |
550 | } else { | |
551 | tmphi = addrh; | |
552 | tmplow = addrl; | |
553 | } | |
554 | dma_hw_desc = desc->hw_desc; | |
555 | dma_hw_desc->sg1l = cpu_to_le32((u32)tmplow); | |
556 | dma_hw_desc->sg1u |= cpu_to_le32((u32)tmphi); | |
557 | break; | |
558 | case PPC440SPE_XOR_ID: | |
559 | xor_hw_desc = desc->hw_desc; | |
560 | xor_hw_desc->ops[src_idx].l = addrl; | |
561 | xor_hw_desc->ops[src_idx].h |= addrh; | |
562 | break; | |
563 | } | |
564 | } | |
565 | ||
566 | /** | |
567 | * ppc440spe_desc_set_src_mult - set source address mult into the descriptor | |
568 | */ | |
569 | static void ppc440spe_desc_set_src_mult(struct ppc440spe_adma_desc_slot *desc, | |
570 | struct ppc440spe_adma_chan *chan, u32 mult_index, | |
571 | int sg_index, unsigned char mult_value) | |
572 | { | |
573 | struct dma_cdb *dma_hw_desc; | |
574 | struct xor_cb *xor_hw_desc; | |
575 | u32 *psgu; | |
576 | ||
577 | switch (chan->device->id) { | |
578 | case PPC440SPE_DMA0_ID: | |
579 | case PPC440SPE_DMA1_ID: | |
580 | dma_hw_desc = desc->hw_desc; | |
581 | ||
582 | switch (sg_index) { | |
583 | /* for RXOR operations set multiplier | |
584 | * into source cued address | |
585 | */ | |
586 | case DMA_CDB_SG_SRC: | |
587 | psgu = &dma_hw_desc->sg1u; | |
588 | break; | |
589 | /* for WXOR operations set multiplier | |
590 | * into destination cued address(es) | |
591 | */ | |
592 | case DMA_CDB_SG_DST1: | |
593 | psgu = &dma_hw_desc->sg2u; | |
594 | break; | |
595 | case DMA_CDB_SG_DST2: | |
596 | psgu = &dma_hw_desc->sg3u; | |
597 | break; | |
598 | default: | |
599 | BUG(); | |
600 | } | |
601 | ||
602 | *psgu |= cpu_to_le32(mult_value << mult_index); | |
603 | break; | |
604 | case PPC440SPE_XOR_ID: | |
605 | xor_hw_desc = desc->hw_desc; | |
606 | break; | |
607 | default: | |
608 | BUG(); | |
609 | } | |
610 | } | |
611 | ||
612 | /** | |
613 | * ppc440spe_desc_set_dest_addr - set destination address into the descriptor | |
614 | */ | |
615 | static void ppc440spe_desc_set_dest_addr(struct ppc440spe_adma_desc_slot *desc, | |
616 | struct ppc440spe_adma_chan *chan, | |
617 | dma_addr_t addrh, dma_addr_t addrl, | |
618 | u32 dst_idx) | |
619 | { | |
620 | struct dma_cdb *dma_hw_desc; | |
621 | struct xor_cb *xor_hw_desc; | |
622 | phys_addr_t addr64, tmphi, tmplow; | |
623 | u32 *psgu, *psgl; | |
624 | ||
625 | switch (chan->device->id) { | |
626 | case PPC440SPE_DMA0_ID: | |
627 | case PPC440SPE_DMA1_ID: | |
628 | if (!addrh) { | |
629 | addr64 = addrl; | |
630 | tmphi = (addr64 >> 32); | |
631 | tmplow = (addr64 & 0xFFFFFFFF); | |
632 | } else { | |
633 | tmphi = addrh; | |
634 | tmplow = addrl; | |
635 | } | |
636 | dma_hw_desc = desc->hw_desc; | |
637 | ||
638 | psgu = dst_idx ? &dma_hw_desc->sg3u : &dma_hw_desc->sg2u; | |
639 | psgl = dst_idx ? &dma_hw_desc->sg3l : &dma_hw_desc->sg2l; | |
640 | ||
641 | *psgl = cpu_to_le32((u32)tmplow); | |
642 | *psgu |= cpu_to_le32((u32)tmphi); | |
643 | break; | |
644 | case PPC440SPE_XOR_ID: | |
645 | xor_hw_desc = desc->hw_desc; | |
646 | xor_hw_desc->cbtal = addrl; | |
647 | xor_hw_desc->cbtah |= addrh; | |
648 | break; | |
649 | } | |
650 | } | |
651 | ||
652 | /** | |
653 | * ppc440spe_desc_set_byte_count - set number of data bytes involved | |
654 | * into the operation | |
655 | */ | |
656 | static void ppc440spe_desc_set_byte_count(struct ppc440spe_adma_desc_slot *desc, | |
657 | struct ppc440spe_adma_chan *chan, | |
658 | u32 byte_count) | |
659 | { | |
660 | struct dma_cdb *dma_hw_desc; | |
661 | struct xor_cb *xor_hw_desc; | |
662 | ||
663 | switch (chan->device->id) { | |
664 | case PPC440SPE_DMA0_ID: | |
665 | case PPC440SPE_DMA1_ID: | |
666 | dma_hw_desc = desc->hw_desc; | |
667 | dma_hw_desc->cnt = cpu_to_le32(byte_count); | |
668 | break; | |
669 | case PPC440SPE_XOR_ID: | |
670 | xor_hw_desc = desc->hw_desc; | |
671 | xor_hw_desc->cbbc = byte_count; | |
672 | break; | |
673 | } | |
674 | } | |
675 | ||
676 | /** | |
677 | * ppc440spe_desc_set_rxor_block_size - set RXOR block size | |
678 | */ | |
679 | static inline void ppc440spe_desc_set_rxor_block_size(u32 byte_count) | |
680 | { | |
681 | /* assume that byte_count is aligned on the 512-boundary; | |
682 | * thus write it directly to the register (bits 23:31 are | |
683 | * reserved there). | |
684 | */ | |
685 | dcr_write(ppc440spe_mq_dcr_host, DCRN_MQ0_CF2H, byte_count); | |
686 | } | |
687 | ||
688 | /** | |
689 | * ppc440spe_desc_set_dcheck - set CHECK pattern | |
690 | */ | |
691 | static void ppc440spe_desc_set_dcheck(struct ppc440spe_adma_desc_slot *desc, | |
692 | struct ppc440spe_adma_chan *chan, u8 *qword) | |
693 | { | |
694 | struct dma_cdb *dma_hw_desc; | |
695 | ||
696 | switch (chan->device->id) { | |
697 | case PPC440SPE_DMA0_ID: | |
698 | case PPC440SPE_DMA1_ID: | |
699 | dma_hw_desc = desc->hw_desc; | |
700 | iowrite32(qword[0], &dma_hw_desc->sg3l); | |
701 | iowrite32(qword[4], &dma_hw_desc->sg3u); | |
702 | iowrite32(qword[8], &dma_hw_desc->sg2l); | |
703 | iowrite32(qword[12], &dma_hw_desc->sg2u); | |
704 | break; | |
705 | default: | |
706 | BUG(); | |
707 | } | |
708 | } | |
709 | ||
710 | /** | |
711 | * ppc440spe_xor_set_link - set link address in xor CB | |
712 | */ | |
713 | static void ppc440spe_xor_set_link(struct ppc440spe_adma_desc_slot *prev_desc, | |
714 | struct ppc440spe_adma_desc_slot *next_desc) | |
715 | { | |
716 | struct xor_cb *xor_hw_desc = prev_desc->hw_desc; | |
717 | ||
718 | if (unlikely(!next_desc || !(next_desc->phys))) { | |
719 | printk(KERN_ERR "%s: next_desc=0x%p; next_desc->phys=0x%llx\n", | |
720 | __func__, next_desc, | |
721 | next_desc ? next_desc->phys : 0); | |
722 | BUG(); | |
723 | } | |
724 | ||
725 | xor_hw_desc->cbs = 0; | |
726 | xor_hw_desc->cblal = next_desc->phys; | |
727 | xor_hw_desc->cblah = 0; | |
728 | xor_hw_desc->cbc |= XOR_CBCR_LNK_BIT; | |
729 | } | |
730 | ||
731 | /** | |
732 | * ppc440spe_desc_set_link - set the address of descriptor following this | |
733 | * descriptor in chain | |
734 | */ | |
735 | static void ppc440spe_desc_set_link(struct ppc440spe_adma_chan *chan, | |
736 | struct ppc440spe_adma_desc_slot *prev_desc, | |
737 | struct ppc440spe_adma_desc_slot *next_desc) | |
738 | { | |
739 | unsigned long flags; | |
740 | struct ppc440spe_adma_desc_slot *tail = next_desc; | |
741 | ||
742 | if (unlikely(!prev_desc || !next_desc || | |
743 | (prev_desc->hw_next && prev_desc->hw_next != next_desc))) { | |
744 | /* If previous next is overwritten something is wrong. | |
745 | * though we may refetch from append to initiate list | |
746 | * processing; in this case - it's ok. | |
747 | */ | |
748 | printk(KERN_ERR "%s: prev_desc=0x%p; next_desc=0x%p; " | |
749 | "prev->hw_next=0x%p\n", __func__, prev_desc, | |
750 | next_desc, prev_desc ? prev_desc->hw_next : 0); | |
751 | BUG(); | |
752 | } | |
753 | ||
754 | local_irq_save(flags); | |
755 | ||
756 | /* do s/w chaining both for DMA and XOR descriptors */ | |
757 | prev_desc->hw_next = next_desc; | |
758 | ||
759 | switch (chan->device->id) { | |
760 | case PPC440SPE_DMA0_ID: | |
761 | case PPC440SPE_DMA1_ID: | |
762 | break; | |
763 | case PPC440SPE_XOR_ID: | |
764 | /* bind descriptor to the chain */ | |
765 | while (tail->hw_next) | |
766 | tail = tail->hw_next; | |
767 | xor_last_linked = tail; | |
768 | ||
769 | if (prev_desc == xor_last_submit) | |
770 | /* do not link to the last submitted CB */ | |
771 | break; | |
772 | ppc440spe_xor_set_link(prev_desc, next_desc); | |
773 | break; | |
774 | } | |
775 | ||
776 | local_irq_restore(flags); | |
777 | } | |
778 | ||
12458ea0 AG |
779 | /** |
780 | * ppc440spe_desc_get_link - get the address of the descriptor that | |
781 | * follows this one | |
782 | */ | |
783 | static inline u32 ppc440spe_desc_get_link(struct ppc440spe_adma_desc_slot *desc, | |
784 | struct ppc440spe_adma_chan *chan) | |
785 | { | |
786 | if (!desc->hw_next) | |
787 | return 0; | |
788 | ||
789 | return desc->hw_next->phys; | |
790 | } | |
791 | ||
792 | /** | |
793 | * ppc440spe_desc_is_aligned - check alignment | |
794 | */ | |
795 | static inline int ppc440spe_desc_is_aligned( | |
796 | struct ppc440spe_adma_desc_slot *desc, int num_slots) | |
797 | { | |
798 | return (desc->idx & (num_slots - 1)) ? 0 : 1; | |
799 | } | |
800 | ||
801 | /** | |
802 | * ppc440spe_chan_xor_slot_count - get the number of slots necessary for | |
803 | * XOR operation | |
804 | */ | |
805 | static int ppc440spe_chan_xor_slot_count(size_t len, int src_cnt, | |
806 | int *slots_per_op) | |
807 | { | |
808 | int slot_cnt; | |
809 | ||
810 | /* each XOR descriptor provides up to 16 source operands */ | |
811 | slot_cnt = *slots_per_op = (src_cnt + XOR_MAX_OPS - 1)/XOR_MAX_OPS; | |
812 | ||
813 | if (likely(len <= PPC440SPE_ADMA_XOR_MAX_BYTE_COUNT)) | |
814 | return slot_cnt; | |
815 | ||
816 | printk(KERN_ERR "%s: len %d > max %d !!\n", | |
817 | __func__, len, PPC440SPE_ADMA_XOR_MAX_BYTE_COUNT); | |
818 | BUG(); | |
819 | return slot_cnt; | |
820 | } | |
821 | ||
822 | /** | |
823 | * ppc440spe_dma2_pq_slot_count - get the number of slots necessary for | |
824 | * DMA2 PQ operation | |
825 | */ | |
826 | static int ppc440spe_dma2_pq_slot_count(dma_addr_t *srcs, | |
827 | int src_cnt, size_t len) | |
828 | { | |
829 | signed long long order = 0; | |
830 | int state = 0; | |
831 | int addr_count = 0; | |
832 | int i; | |
833 | for (i = 1; i < src_cnt; i++) { | |
834 | dma_addr_t cur_addr = srcs[i]; | |
835 | dma_addr_t old_addr = srcs[i-1]; | |
836 | switch (state) { | |
837 | case 0: | |
838 | if (cur_addr == old_addr + len) { | |
839 | /* direct RXOR */ | |
840 | order = 1; | |
841 | state = 1; | |
842 | if (i == src_cnt-1) | |
843 | addr_count++; | |
844 | } else if (old_addr == cur_addr + len) { | |
845 | /* reverse RXOR */ | |
846 | order = -1; | |
847 | state = 1; | |
848 | if (i == src_cnt-1) | |
849 | addr_count++; | |
850 | } else { | |
851 | state = 3; | |
852 | } | |
853 | break; | |
854 | case 1: | |
855 | if (i == src_cnt-2 || (order == -1 | |
856 | && cur_addr != old_addr - len)) { | |
857 | order = 0; | |
858 | state = 0; | |
859 | addr_count++; | |
860 | } else if (cur_addr == old_addr + len*order) { | |
861 | state = 2; | |
862 | if (i == src_cnt-1) | |
863 | addr_count++; | |
864 | } else if (cur_addr == old_addr + 2*len) { | |
865 | state = 2; | |
866 | if (i == src_cnt-1) | |
867 | addr_count++; | |
868 | } else if (cur_addr == old_addr + 3*len) { | |
869 | state = 2; | |
870 | if (i == src_cnt-1) | |
871 | addr_count++; | |
872 | } else { | |
873 | order = 0; | |
874 | state = 0; | |
875 | addr_count++; | |
876 | } | |
877 | break; | |
878 | case 2: | |
879 | order = 0; | |
880 | state = 0; | |
881 | addr_count++; | |
882 | break; | |
883 | } | |
884 | if (state == 3) | |
885 | break; | |
886 | } | |
887 | if (src_cnt <= 1 || (state != 1 && state != 2)) { | |
888 | pr_err("%s: src_cnt=%d, state=%d, addr_count=%d, order=%lld\n", | |
889 | __func__, src_cnt, state, addr_count, order); | |
890 | for (i = 0; i < src_cnt; i++) | |
891 | pr_err("\t[%d] 0x%llx \n", i, srcs[i]); | |
892 | BUG(); | |
893 | } | |
894 | ||
895 | return (addr_count + XOR_MAX_OPS - 1) / XOR_MAX_OPS; | |
896 | } | |
897 | ||
898 | ||
899 | /****************************************************************************** | |
900 | * ADMA channel low-level routines | |
901 | ******************************************************************************/ | |
902 | ||
903 | static u32 | |
904 | ppc440spe_chan_get_current_descriptor(struct ppc440spe_adma_chan *chan); | |
905 | static void ppc440spe_chan_append(struct ppc440spe_adma_chan *chan); | |
906 | ||
907 | /** | |
908 | * ppc440spe_adma_device_clear_eot_status - interrupt ack to XOR or DMA engine | |
909 | */ | |
910 | static void ppc440spe_adma_device_clear_eot_status( | |
911 | struct ppc440spe_adma_chan *chan) | |
912 | { | |
913 | struct dma_regs *dma_reg; | |
914 | struct xor_regs *xor_reg; | |
915 | u8 *p = chan->device->dma_desc_pool_virt; | |
916 | struct dma_cdb *cdb; | |
917 | u32 rv, i; | |
918 | ||
919 | switch (chan->device->id) { | |
920 | case PPC440SPE_DMA0_ID: | |
921 | case PPC440SPE_DMA1_ID: | |
922 | /* read FIFO to ack */ | |
923 | dma_reg = chan->device->dma_reg; | |
924 | while ((rv = ioread32(&dma_reg->csfpl))) { | |
925 | i = rv & DMA_CDB_ADDR_MSK; | |
926 | cdb = (struct dma_cdb *)&p[i - | |
927 | (u32)chan->device->dma_desc_pool]; | |
928 | ||
929 | /* Clear opcode to ack. This is necessary for | |
930 | * ZeroSum operations only | |
931 | */ | |
932 | cdb->opc = 0; | |
933 | ||
934 | if (test_bit(PPC440SPE_RXOR_RUN, | |
935 | &ppc440spe_rxor_state)) { | |
936 | /* probably this is a completed RXOR op, | |
937 | * get pointer to CDB using the fact that | |
938 | * physical and virtual addresses of CDB | |
939 | * in pools have the same offsets | |
940 | */ | |
941 | if (le32_to_cpu(cdb->sg1u) & | |
942 | DMA_CUED_XOR_BASE) { | |
943 | /* this is a RXOR */ | |
944 | clear_bit(PPC440SPE_RXOR_RUN, | |
945 | &ppc440spe_rxor_state); | |
946 | } | |
947 | } | |
948 | ||
949 | if (rv & DMA_CDB_STATUS_MSK) { | |
950 | /* ZeroSum check failed | |
951 | */ | |
952 | struct ppc440spe_adma_desc_slot *iter; | |
953 | dma_addr_t phys = rv & ~DMA_CDB_MSK; | |
954 | ||
955 | /* | |
956 | * Update the status of corresponding | |
957 | * descriptor. | |
958 | */ | |
959 | list_for_each_entry(iter, &chan->chain, | |
960 | chain_node) { | |
961 | if (iter->phys == phys) | |
962 | break; | |
963 | } | |
964 | /* | |
965 | * if cannot find the corresponding | |
966 | * slot it's a bug | |
967 | */ | |
968 | BUG_ON(&iter->chain_node == &chan->chain); | |
969 | ||
970 | if (iter->xor_check_result) { | |
971 | if (test_bit(PPC440SPE_DESC_PCHECK, | |
972 | &iter->flags)) { | |
973 | *iter->xor_check_result |= | |
974 | SUM_CHECK_P_RESULT; | |
975 | } else | |
976 | if (test_bit(PPC440SPE_DESC_QCHECK, | |
977 | &iter->flags)) { | |
978 | *iter->xor_check_result |= | |
979 | SUM_CHECK_Q_RESULT; | |
980 | } else | |
981 | BUG(); | |
982 | } | |
983 | } | |
984 | } | |
985 | ||
986 | rv = ioread32(&dma_reg->dsts); | |
987 | if (rv) { | |
988 | pr_err("DMA%d err status: 0x%x\n", | |
989 | chan->device->id, rv); | |
990 | /* write back to clear */ | |
991 | iowrite32(rv, &dma_reg->dsts); | |
992 | } | |
993 | break; | |
994 | case PPC440SPE_XOR_ID: | |
995 | /* reset status bits to ack */ | |
996 | xor_reg = chan->device->xor_reg; | |
997 | rv = ioread32be(&xor_reg->sr); | |
998 | iowrite32be(rv, &xor_reg->sr); | |
999 | ||
1000 | if (rv & (XOR_IE_ICBIE_BIT|XOR_IE_ICIE_BIT|XOR_IE_RPTIE_BIT)) { | |
1001 | if (rv & XOR_IE_RPTIE_BIT) { | |
1002 | /* Read PLB Timeout Error. | |
1003 | * Try to resubmit the CB | |
1004 | */ | |
1005 | u32 val = ioread32be(&xor_reg->ccbalr); | |
1006 | ||
1007 | iowrite32be(val, &xor_reg->cblalr); | |
1008 | ||
1009 | val = ioread32be(&xor_reg->crsr); | |
1010 | iowrite32be(val | XOR_CRSR_XAE_BIT, | |
1011 | &xor_reg->crsr); | |
1012 | } else | |
1013 | pr_err("XOR ERR 0x%x status\n", rv); | |
1014 | break; | |
1015 | } | |
1016 | ||
1017 | /* if the XORcore is idle, but there are unprocessed CBs | |
1018 | * then refetch the s/w chain here | |
1019 | */ | |
1020 | if (!(ioread32be(&xor_reg->sr) & XOR_SR_XCP_BIT) && | |
1021 | do_xor_refetch) | |
1022 | ppc440spe_chan_append(chan); | |
1023 | break; | |
1024 | } | |
1025 | } | |
1026 | ||
1027 | /** | |
1028 | * ppc440spe_chan_is_busy - get the channel status | |
1029 | */ | |
1030 | static int ppc440spe_chan_is_busy(struct ppc440spe_adma_chan *chan) | |
1031 | { | |
1032 | struct dma_regs *dma_reg; | |
1033 | struct xor_regs *xor_reg; | |
1034 | int busy = 0; | |
1035 | ||
1036 | switch (chan->device->id) { | |
1037 | case PPC440SPE_DMA0_ID: | |
1038 | case PPC440SPE_DMA1_ID: | |
1039 | dma_reg = chan->device->dma_reg; | |
1040 | /* if command FIFO's head and tail pointers are equal and | |
1041 | * status tail is the same as command, then channel is free | |
1042 | */ | |
1043 | if (ioread16(&dma_reg->cpfhp) != ioread16(&dma_reg->cpftp) || | |
1044 | ioread16(&dma_reg->cpftp) != ioread16(&dma_reg->csftp)) | |
1045 | busy = 1; | |
1046 | break; | |
1047 | case PPC440SPE_XOR_ID: | |
1048 | /* use the special status bit for the XORcore | |
1049 | */ | |
1050 | xor_reg = chan->device->xor_reg; | |
1051 | busy = (ioread32be(&xor_reg->sr) & XOR_SR_XCP_BIT) ? 1 : 0; | |
1052 | break; | |
1053 | } | |
1054 | ||
1055 | return busy; | |
1056 | } | |
1057 | ||
1058 | /** | |
1059 | * ppc440spe_chan_set_first_xor_descriptor - init XORcore chain | |
1060 | */ | |
1061 | static void ppc440spe_chan_set_first_xor_descriptor( | |
1062 | struct ppc440spe_adma_chan *chan, | |
1063 | struct ppc440spe_adma_desc_slot *next_desc) | |
1064 | { | |
1065 | struct xor_regs *xor_reg = chan->device->xor_reg; | |
1066 | ||
1067 | if (ioread32be(&xor_reg->sr) & XOR_SR_XCP_BIT) | |
1068 | printk(KERN_INFO "%s: Warn: XORcore is running " | |
1069 | "when try to set the first CDB!\n", | |
1070 | __func__); | |
1071 | ||
1072 | xor_last_submit = xor_last_linked = next_desc; | |
1073 | ||
1074 | iowrite32be(XOR_CRSR_64BA_BIT, &xor_reg->crsr); | |
1075 | ||
1076 | iowrite32be(next_desc->phys, &xor_reg->cblalr); | |
1077 | iowrite32be(0, &xor_reg->cblahr); | |
1078 | iowrite32be(ioread32be(&xor_reg->cbcr) | XOR_CBCR_LNK_BIT, | |
1079 | &xor_reg->cbcr); | |
1080 | ||
1081 | chan->hw_chain_inited = 1; | |
1082 | } | |
1083 | ||
1084 | /** | |
1085 | * ppc440spe_dma_put_desc - put DMA0,1 descriptor to FIFO. | |
1086 | * called with irqs disabled | |
1087 | */ | |
1088 | static void ppc440spe_dma_put_desc(struct ppc440spe_adma_chan *chan, | |
1089 | struct ppc440spe_adma_desc_slot *desc) | |
1090 | { | |
1091 | u32 pcdb; | |
1092 | struct dma_regs *dma_reg = chan->device->dma_reg; | |
1093 | ||
1094 | pcdb = desc->phys; | |
1095 | if (!test_bit(PPC440SPE_DESC_INT, &desc->flags)) | |
1096 | pcdb |= DMA_CDB_NO_INT; | |
1097 | ||
1098 | chan_last_sub[chan->device->id] = desc; | |
1099 | ||
1100 | ADMA_LL_DBG(print_cb(chan, desc->hw_desc)); | |
1101 | ||
1102 | iowrite32(pcdb, &dma_reg->cpfpl); | |
1103 | } | |
1104 | ||
1105 | /** | |
1106 | * ppc440spe_chan_append - update the h/w chain in the channel | |
1107 | */ | |
1108 | static void ppc440spe_chan_append(struct ppc440spe_adma_chan *chan) | |
1109 | { | |
1110 | struct xor_regs *xor_reg; | |
1111 | struct ppc440spe_adma_desc_slot *iter; | |
1112 | struct xor_cb *xcb; | |
1113 | u32 cur_desc; | |
1114 | unsigned long flags; | |
1115 | ||
1116 | local_irq_save(flags); | |
1117 | ||
1118 | switch (chan->device->id) { | |
1119 | case PPC440SPE_DMA0_ID: | |
1120 | case PPC440SPE_DMA1_ID: | |
1121 | cur_desc = ppc440spe_chan_get_current_descriptor(chan); | |
1122 | ||
1123 | if (likely(cur_desc)) { | |
1124 | iter = chan_last_sub[chan->device->id]; | |
1125 | BUG_ON(!iter); | |
1126 | } else { | |
1127 | /* first peer */ | |
1128 | iter = chan_first_cdb[chan->device->id]; | |
1129 | BUG_ON(!iter); | |
1130 | ppc440spe_dma_put_desc(chan, iter); | |
1131 | chan->hw_chain_inited = 1; | |
1132 | } | |
1133 | ||
1134 | /* is there something new to append */ | |
1135 | if (!iter->hw_next) | |
1136 | break; | |
1137 | ||
1138 | /* flush descriptors from the s/w queue to fifo */ | |
1139 | list_for_each_entry_continue(iter, &chan->chain, chain_node) { | |
1140 | ppc440spe_dma_put_desc(chan, iter); | |
1141 | if (!iter->hw_next) | |
1142 | break; | |
1143 | } | |
1144 | break; | |
1145 | case PPC440SPE_XOR_ID: | |
1146 | /* update h/w links and refetch */ | |
1147 | if (!xor_last_submit->hw_next) | |
1148 | break; | |
1149 | ||
1150 | xor_reg = chan->device->xor_reg; | |
1151 | /* the last linked CDB has to generate an interrupt | |
1152 | * that we'd be able to append the next lists to h/w | |
1153 | * regardless of the XOR engine state at the moment of | |
1154 | * appending of these next lists | |
1155 | */ | |
1156 | xcb = xor_last_linked->hw_desc; | |
1157 | xcb->cbc |= XOR_CBCR_CBCE_BIT; | |
1158 | ||
1159 | if (!(ioread32be(&xor_reg->sr) & XOR_SR_XCP_BIT)) { | |
1160 | /* XORcore is idle. Refetch now */ | |
1161 | do_xor_refetch = 0; | |
1162 | ppc440spe_xor_set_link(xor_last_submit, | |
1163 | xor_last_submit->hw_next); | |
1164 | ||
1165 | ADMA_LL_DBG(print_cb_list(chan, | |
1166 | xor_last_submit->hw_next)); | |
1167 | ||
1168 | xor_last_submit = xor_last_linked; | |
1169 | iowrite32be(ioread32be(&xor_reg->crsr) | | |
1170 | XOR_CRSR_RCBE_BIT | XOR_CRSR_64BA_BIT, | |
1171 | &xor_reg->crsr); | |
1172 | } else { | |
1173 | /* XORcore is running. Refetch later in the handler */ | |
1174 | do_xor_refetch = 1; | |
1175 | } | |
1176 | ||
1177 | break; | |
1178 | } | |
1179 | ||
1180 | local_irq_restore(flags); | |
1181 | } | |
1182 | ||
1183 | /** | |
1184 | * ppc440spe_chan_get_current_descriptor - get the currently executed descriptor | |
1185 | */ | |
1186 | static u32 | |
1187 | ppc440spe_chan_get_current_descriptor(struct ppc440spe_adma_chan *chan) | |
1188 | { | |
1189 | struct dma_regs *dma_reg; | |
1190 | struct xor_regs *xor_reg; | |
1191 | ||
1192 | if (unlikely(!chan->hw_chain_inited)) | |
1193 | /* h/w descriptor chain is not initialized yet */ | |
1194 | return 0; | |
1195 | ||
1196 | switch (chan->device->id) { | |
1197 | case PPC440SPE_DMA0_ID: | |
1198 | case PPC440SPE_DMA1_ID: | |
1199 | dma_reg = chan->device->dma_reg; | |
1200 | return ioread32(&dma_reg->acpl) & (~DMA_CDB_MSK); | |
1201 | case PPC440SPE_XOR_ID: | |
1202 | xor_reg = chan->device->xor_reg; | |
1203 | return ioread32be(&xor_reg->ccbalr); | |
1204 | } | |
1205 | return 0; | |
1206 | } | |
1207 | ||
1208 | /** | |
1209 | * ppc440spe_chan_run - enable the channel | |
1210 | */ | |
1211 | static void ppc440spe_chan_run(struct ppc440spe_adma_chan *chan) | |
1212 | { | |
1213 | struct xor_regs *xor_reg; | |
1214 | ||
1215 | switch (chan->device->id) { | |
1216 | case PPC440SPE_DMA0_ID: | |
1217 | case PPC440SPE_DMA1_ID: | |
1218 | /* DMAs are always enabled, do nothing */ | |
1219 | break; | |
1220 | case PPC440SPE_XOR_ID: | |
1221 | /* drain write buffer */ | |
1222 | xor_reg = chan->device->xor_reg; | |
1223 | ||
1224 | /* fetch descriptor pointed to in <link> */ | |
1225 | iowrite32be(XOR_CRSR_64BA_BIT | XOR_CRSR_XAE_BIT, | |
1226 | &xor_reg->crsr); | |
1227 | break; | |
1228 | } | |
1229 | } | |
1230 | ||
1231 | /****************************************************************************** | |
1232 | * ADMA device level | |
1233 | ******************************************************************************/ | |
1234 | ||
1235 | static void ppc440spe_chan_start_null_xor(struct ppc440spe_adma_chan *chan); | |
1236 | static int ppc440spe_adma_alloc_chan_resources(struct dma_chan *chan); | |
1237 | ||
1238 | static dma_cookie_t | |
1239 | ppc440spe_adma_tx_submit(struct dma_async_tx_descriptor *tx); | |
1240 | ||
1241 | static void ppc440spe_adma_set_dest(struct ppc440spe_adma_desc_slot *tx, | |
1242 | dma_addr_t addr, int index); | |
1243 | static void | |
1244 | ppc440spe_adma_memcpy_xor_set_src(struct ppc440spe_adma_desc_slot *tx, | |
1245 | dma_addr_t addr, int index); | |
1246 | ||
1247 | static void | |
1248 | ppc440spe_adma_pq_set_dest(struct ppc440spe_adma_desc_slot *tx, | |
1249 | dma_addr_t *paddr, unsigned long flags); | |
1250 | static void | |
1251 | ppc440spe_adma_pq_set_src(struct ppc440spe_adma_desc_slot *tx, | |
1252 | dma_addr_t addr, int index); | |
1253 | static void | |
1254 | ppc440spe_adma_pq_set_src_mult(struct ppc440spe_adma_desc_slot *tx, | |
1255 | unsigned char mult, int index, int dst_pos); | |
1256 | static void | |
1257 | ppc440spe_adma_pqzero_sum_set_dest(struct ppc440spe_adma_desc_slot *tx, | |
1258 | dma_addr_t paddr, dma_addr_t qaddr); | |
1259 | ||
1260 | static struct page *ppc440spe_rxor_srcs[32]; | |
1261 | ||
1262 | /** | |
1263 | * ppc440spe_can_rxor - check if the operands may be processed with RXOR | |
1264 | */ | |
1265 | static int ppc440spe_can_rxor(struct page **srcs, int src_cnt, size_t len) | |
1266 | { | |
1267 | int i, order = 0, state = 0; | |
1268 | int idx = 0; | |
1269 | ||
1270 | if (unlikely(!(src_cnt > 1))) | |
1271 | return 0; | |
1272 | ||
1273 | BUG_ON(src_cnt > ARRAY_SIZE(ppc440spe_rxor_srcs)); | |
1274 | ||
1275 | /* Skip holes in the source list before checking */ | |
1276 | for (i = 0; i < src_cnt; i++) { | |
1277 | if (!srcs[i]) | |
1278 | continue; | |
1279 | ppc440spe_rxor_srcs[idx++] = srcs[i]; | |
1280 | } | |
1281 | src_cnt = idx; | |
1282 | ||
1283 | for (i = 1; i < src_cnt; i++) { | |
1284 | char *cur_addr = page_address(ppc440spe_rxor_srcs[i]); | |
1285 | char *old_addr = page_address(ppc440spe_rxor_srcs[i - 1]); | |
1286 | ||
1287 | switch (state) { | |
1288 | case 0: | |
1289 | if (cur_addr == old_addr + len) { | |
1290 | /* direct RXOR */ | |
1291 | order = 1; | |
1292 | state = 1; | |
1293 | } else if (old_addr == cur_addr + len) { | |
1294 | /* reverse RXOR */ | |
1295 | order = -1; | |
1296 | state = 1; | |
1297 | } else | |
1298 | goto out; | |
1299 | break; | |
1300 | case 1: | |
1301 | if ((i == src_cnt - 2) || | |
1302 | (order == -1 && cur_addr != old_addr - len)) { | |
1303 | order = 0; | |
1304 | state = 0; | |
1305 | } else if ((cur_addr == old_addr + len * order) || | |
1306 | (cur_addr == old_addr + 2 * len) || | |
1307 | (cur_addr == old_addr + 3 * len)) { | |
1308 | state = 2; | |
1309 | } else { | |
1310 | order = 0; | |
1311 | state = 0; | |
1312 | } | |
1313 | break; | |
1314 | case 2: | |
1315 | order = 0; | |
1316 | state = 0; | |
1317 | break; | |
1318 | } | |
1319 | } | |
1320 | ||
1321 | out: | |
1322 | if (state == 1 || state == 2) | |
1323 | return 1; | |
1324 | ||
1325 | return 0; | |
1326 | } | |
1327 | ||
1328 | /** | |
1329 | * ppc440spe_adma_device_estimate - estimate the efficiency of processing | |
1330 | * the operation given on this channel. It's assumed that 'chan' is | |
1331 | * capable to process 'cap' type of operation. | |
1332 | * @chan: channel to use | |
1333 | * @cap: type of transaction | |
1334 | * @dst_lst: array of destination pointers | |
1335 | * @dst_cnt: number of destination operands | |
1336 | * @src_lst: array of source pointers | |
1337 | * @src_cnt: number of source operands | |
1338 | * @src_sz: size of each source operand | |
1339 | */ | |
1340 | static int ppc440spe_adma_estimate(struct dma_chan *chan, | |
1341 | enum dma_transaction_type cap, struct page **dst_lst, int dst_cnt, | |
1342 | struct page **src_lst, int src_cnt, size_t src_sz) | |
1343 | { | |
1344 | int ef = 1; | |
1345 | ||
1346 | if (cap == DMA_PQ || cap == DMA_PQ_VAL) { | |
1347 | /* If RAID-6 capabilities were not activated don't try | |
1348 | * to use them | |
1349 | */ | |
1350 | if (unlikely(!ppc440spe_r6_enabled)) | |
1351 | return -1; | |
1352 | } | |
1353 | /* In the current implementation of ppc440spe ADMA driver it | |
1354 | * makes sense to pick out only pq case, because it may be | |
1355 | * processed: | |
1356 | * (1) either using Biskup method on DMA2; | |
1357 | * (2) or on DMA0/1. | |
1358 | * Thus we give a favour to (1) if the sources are suitable; | |
1359 | * else let it be processed on one of the DMA0/1 engines. | |
1360 | * In the sum_product case where destination is also the | |
1361 | * source process it on DMA0/1 only. | |
1362 | */ | |
1363 | if (cap == DMA_PQ && chan->chan_id == PPC440SPE_XOR_ID) { | |
1364 | ||
1365 | if (dst_cnt == 1 && src_cnt == 2 && dst_lst[0] == src_lst[1]) | |
1366 | ef = 0; /* sum_product case, process on DMA0/1 */ | |
1367 | else if (ppc440spe_can_rxor(src_lst, src_cnt, src_sz)) | |
1368 | ef = 3; /* override (DMA0/1 + idle) */ | |
1369 | else | |
1370 | ef = 0; /* can't process on DMA2 if !rxor */ | |
1371 | } | |
1372 | ||
1373 | /* channel idleness increases the priority */ | |
1374 | if (likely(ef) && | |
1375 | !ppc440spe_chan_is_busy(to_ppc440spe_adma_chan(chan))) | |
1376 | ef++; | |
1377 | ||
1378 | return ef; | |
1379 | } | |
1380 | ||
1381 | struct dma_chan * | |
1382 | ppc440spe_async_tx_find_best_channel(enum dma_transaction_type cap, | |
1383 | struct page **dst_lst, int dst_cnt, struct page **src_lst, | |
1384 | int src_cnt, size_t src_sz) | |
1385 | { | |
1386 | struct dma_chan *best_chan = NULL; | |
1387 | struct ppc_dma_chan_ref *ref; | |
1388 | int best_rank = -1; | |
1389 | ||
1390 | if (unlikely(!src_sz)) | |
1391 | return NULL; | |
1392 | if (src_sz > PAGE_SIZE) { | |
1393 | /* | |
1394 | * should a user of the api ever pass > PAGE_SIZE requests | |
1395 | * we sort out cases where temporary page-sized buffers | |
1396 | * are used. | |
1397 | */ | |
1398 | switch (cap) { | |
1399 | case DMA_PQ: | |
1400 | if (src_cnt == 1 && dst_lst[1] == src_lst[0]) | |
1401 | return NULL; | |
1402 | if (src_cnt == 2 && dst_lst[1] == src_lst[1]) | |
1403 | return NULL; | |
1404 | break; | |
1405 | case DMA_PQ_VAL: | |
1406 | case DMA_XOR_VAL: | |
1407 | return NULL; | |
1408 | default: | |
1409 | break; | |
1410 | } | |
1411 | } | |
1412 | ||
1413 | list_for_each_entry(ref, &ppc440spe_adma_chan_list, node) { | |
1414 | if (dma_has_cap(cap, ref->chan->device->cap_mask)) { | |
1415 | int rank; | |
1416 | ||
1417 | rank = ppc440spe_adma_estimate(ref->chan, cap, dst_lst, | |
1418 | dst_cnt, src_lst, src_cnt, src_sz); | |
1419 | if (rank > best_rank) { | |
1420 | best_rank = rank; | |
1421 | best_chan = ref->chan; | |
1422 | } | |
1423 | } | |
1424 | } | |
1425 | ||
1426 | return best_chan; | |
1427 | } | |
1428 | EXPORT_SYMBOL_GPL(ppc440spe_async_tx_find_best_channel); | |
1429 | ||
1430 | /** | |
1431 | * ppc440spe_get_group_entry - get group entry with index idx | |
1432 | * @tdesc: is the last allocated slot in the group. | |
1433 | */ | |
1434 | static struct ppc440spe_adma_desc_slot * | |
1435 | ppc440spe_get_group_entry(struct ppc440spe_adma_desc_slot *tdesc, u32 entry_idx) | |
1436 | { | |
1437 | struct ppc440spe_adma_desc_slot *iter = tdesc->group_head; | |
1438 | int i = 0; | |
1439 | ||
1440 | if (entry_idx < 0 || entry_idx >= (tdesc->src_cnt + tdesc->dst_cnt)) { | |
1441 | printk("%s: entry_idx %d, src_cnt %d, dst_cnt %d\n", | |
1442 | __func__, entry_idx, tdesc->src_cnt, tdesc->dst_cnt); | |
1443 | BUG(); | |
1444 | } | |
1445 | ||
1446 | list_for_each_entry(iter, &tdesc->group_list, chain_node) { | |
1447 | if (i++ == entry_idx) | |
1448 | break; | |
1449 | } | |
1450 | return iter; | |
1451 | } | |
1452 | ||
1453 | /** | |
1454 | * ppc440spe_adma_free_slots - flags descriptor slots for reuse | |
1455 | * @slot: Slot to free | |
1456 | * Caller must hold &ppc440spe_chan->lock while calling this function | |
1457 | */ | |
1458 | static void ppc440spe_adma_free_slots(struct ppc440spe_adma_desc_slot *slot, | |
1459 | struct ppc440spe_adma_chan *chan) | |
1460 | { | |
1461 | int stride = slot->slots_per_op; | |
1462 | ||
1463 | while (stride--) { | |
1464 | slot->slots_per_op = 0; | |
1465 | slot = list_entry(slot->slot_node.next, | |
1466 | struct ppc440spe_adma_desc_slot, | |
1467 | slot_node); | |
1468 | } | |
1469 | } | |
1470 | ||
12458ea0 AG |
1471 | /** |
1472 | * ppc440spe_adma_run_tx_complete_actions - call functions to be called | |
1473 | * upon completion | |
1474 | */ | |
1475 | static dma_cookie_t ppc440spe_adma_run_tx_complete_actions( | |
1476 | struct ppc440spe_adma_desc_slot *desc, | |
1477 | struct ppc440spe_adma_chan *chan, | |
1478 | dma_cookie_t cookie) | |
1479 | { | |
12458ea0 AG |
1480 | BUG_ON(desc->async_tx.cookie < 0); |
1481 | if (desc->async_tx.cookie > 0) { | |
1482 | cookie = desc->async_tx.cookie; | |
1483 | desc->async_tx.cookie = 0; | |
1484 | ||
1485 | /* call the callback (must not sleep or submit new | |
1486 | * operations to this channel) | |
1487 | */ | |
1488 | if (desc->async_tx.callback) | |
1489 | desc->async_tx.callback( | |
1490 | desc->async_tx.callback_param); | |
1491 | ||
d38a8c62 | 1492 | dma_descriptor_unmap(&desc->async_tx); |
12458ea0 AG |
1493 | } |
1494 | ||
1495 | /* run dependent operations */ | |
1496 | dma_run_dependencies(&desc->async_tx); | |
1497 | ||
1498 | return cookie; | |
1499 | } | |
1500 | ||
1501 | /** | |
1502 | * ppc440spe_adma_clean_slot - clean up CDB slot (if ack is set) | |
1503 | */ | |
1504 | static int ppc440spe_adma_clean_slot(struct ppc440spe_adma_desc_slot *desc, | |
1505 | struct ppc440spe_adma_chan *chan) | |
1506 | { | |
1507 | /* the client is allowed to attach dependent operations | |
1508 | * until 'ack' is set | |
1509 | */ | |
1510 | if (!async_tx_test_ack(&desc->async_tx)) | |
1511 | return 0; | |
1512 | ||
1513 | /* leave the last descriptor in the chain | |
1514 | * so we can append to it | |
1515 | */ | |
1516 | if (list_is_last(&desc->chain_node, &chan->chain) || | |
1517 | desc->phys == ppc440spe_chan_get_current_descriptor(chan)) | |
1518 | return 1; | |
1519 | ||
1520 | if (chan->device->id != PPC440SPE_XOR_ID) { | |
1521 | /* our DMA interrupt handler clears opc field of | |
1522 | * each processed descriptor. For all types of | |
1523 | * operations except for ZeroSum we do not actually | |
1524 | * need ack from the interrupt handler. ZeroSum is a | |
1525 | * special case since the result of this operation | |
1526 | * is available from the handler only, so if we see | |
1527 | * such type of descriptor (which is unprocessed yet) | |
1528 | * then leave it in chain. | |
1529 | */ | |
1530 | struct dma_cdb *cdb = desc->hw_desc; | |
1531 | if (cdb->opc == DMA_CDB_OPC_DCHECK128) | |
1532 | return 1; | |
1533 | } | |
1534 | ||
1535 | dev_dbg(chan->device->common.dev, "\tfree slot %llx: %d stride: %d\n", | |
1536 | desc->phys, desc->idx, desc->slots_per_op); | |
1537 | ||
1538 | list_del(&desc->chain_node); | |
1539 | ppc440spe_adma_free_slots(desc, chan); | |
1540 | return 0; | |
1541 | } | |
1542 | ||
1543 | /** | |
1544 | * __ppc440spe_adma_slot_cleanup - this is the common clean-up routine | |
1545 | * which runs through the channel CDBs list until reach the descriptor | |
1546 | * currently processed. When routine determines that all CDBs of group | |
1547 | * are completed then corresponding callbacks (if any) are called and slots | |
1548 | * are freed. | |
1549 | */ | |
1550 | static void __ppc440spe_adma_slot_cleanup(struct ppc440spe_adma_chan *chan) | |
1551 | { | |
1552 | struct ppc440spe_adma_desc_slot *iter, *_iter, *group_start = NULL; | |
1553 | dma_cookie_t cookie = 0; | |
1554 | u32 current_desc = ppc440spe_chan_get_current_descriptor(chan); | |
1555 | int busy = ppc440spe_chan_is_busy(chan); | |
1556 | int seen_current = 0, slot_cnt = 0, slots_per_op = 0; | |
1557 | ||
1558 | dev_dbg(chan->device->common.dev, "ppc440spe adma%d: %s\n", | |
1559 | chan->device->id, __func__); | |
1560 | ||
1561 | if (!current_desc) { | |
1562 | /* There were no transactions yet, so | |
1563 | * nothing to clean | |
1564 | */ | |
1565 | return; | |
1566 | } | |
1567 | ||
1568 | /* free completed slots from the chain starting with | |
1569 | * the oldest descriptor | |
1570 | */ | |
1571 | list_for_each_entry_safe(iter, _iter, &chan->chain, | |
1572 | chain_node) { | |
1573 | dev_dbg(chan->device->common.dev, "\tcookie: %d slot: %d " | |
1574 | "busy: %d this_desc: %#llx next_desc: %#x " | |
1575 | "cur: %#x ack: %d\n", | |
1576 | iter->async_tx.cookie, iter->idx, busy, iter->phys, | |
1577 | ppc440spe_desc_get_link(iter, chan), current_desc, | |
1578 | async_tx_test_ack(&iter->async_tx)); | |
1579 | prefetch(_iter); | |
1580 | prefetch(&_iter->async_tx); | |
1581 | ||
1582 | /* do not advance past the current descriptor loaded into the | |
1583 | * hardware channel,subsequent descriptors are either in process | |
1584 | * or have not been submitted | |
1585 | */ | |
1586 | if (seen_current) | |
1587 | break; | |
1588 | ||
1589 | /* stop the search if we reach the current descriptor and the | |
1590 | * channel is busy, or if it appears that the current descriptor | |
1591 | * needs to be re-read (i.e. has been appended to) | |
1592 | */ | |
1593 | if (iter->phys == current_desc) { | |
1594 | BUG_ON(seen_current++); | |
1595 | if (busy || ppc440spe_desc_get_link(iter, chan)) { | |
1596 | /* not all descriptors of the group have | |
1597 | * been completed; exit. | |
1598 | */ | |
1599 | break; | |
1600 | } | |
1601 | } | |
1602 | ||
1603 | /* detect the start of a group transaction */ | |
1604 | if (!slot_cnt && !slots_per_op) { | |
1605 | slot_cnt = iter->slot_cnt; | |
1606 | slots_per_op = iter->slots_per_op; | |
1607 | if (slot_cnt <= slots_per_op) { | |
1608 | slot_cnt = 0; | |
1609 | slots_per_op = 0; | |
1610 | } | |
1611 | } | |
1612 | ||
1613 | if (slot_cnt) { | |
1614 | if (!group_start) | |
1615 | group_start = iter; | |
1616 | slot_cnt -= slots_per_op; | |
1617 | } | |
1618 | ||
1619 | /* all the members of a group are complete */ | |
1620 | if (slots_per_op != 0 && slot_cnt == 0) { | |
1621 | struct ppc440spe_adma_desc_slot *grp_iter, *_grp_iter; | |
1622 | int end_of_chain = 0; | |
1623 | ||
1624 | /* clean up the group */ | |
1625 | slot_cnt = group_start->slot_cnt; | |
1626 | grp_iter = group_start; | |
1627 | list_for_each_entry_safe_from(grp_iter, _grp_iter, | |
1628 | &chan->chain, chain_node) { | |
1629 | ||
1630 | cookie = ppc440spe_adma_run_tx_complete_actions( | |
1631 | grp_iter, chan, cookie); | |
1632 | ||
1633 | slot_cnt -= slots_per_op; | |
1634 | end_of_chain = ppc440spe_adma_clean_slot( | |
1635 | grp_iter, chan); | |
1636 | if (end_of_chain && slot_cnt) { | |
1637 | /* Should wait for ZeroSum completion */ | |
1638 | if (cookie > 0) | |
4d4e58de | 1639 | chan->common.completed_cookie = cookie; |
12458ea0 AG |
1640 | return; |
1641 | } | |
1642 | ||
1643 | if (slot_cnt == 0 || end_of_chain) | |
1644 | break; | |
1645 | } | |
1646 | ||
1647 | /* the group should be complete at this point */ | |
1648 | BUG_ON(slot_cnt); | |
1649 | ||
1650 | slots_per_op = 0; | |
1651 | group_start = NULL; | |
1652 | if (end_of_chain) | |
1653 | break; | |
1654 | else | |
1655 | continue; | |
1656 | } else if (slots_per_op) /* wait for group completion */ | |
1657 | continue; | |
1658 | ||
1659 | cookie = ppc440spe_adma_run_tx_complete_actions(iter, chan, | |
1660 | cookie); | |
1661 | ||
1662 | if (ppc440spe_adma_clean_slot(iter, chan)) | |
1663 | break; | |
1664 | } | |
1665 | ||
1666 | BUG_ON(!seen_current); | |
1667 | ||
1668 | if (cookie > 0) { | |
4d4e58de | 1669 | chan->common.completed_cookie = cookie; |
12458ea0 AG |
1670 | pr_debug("\tcompleted cookie %d\n", cookie); |
1671 | } | |
1672 | ||
1673 | } | |
1674 | ||
1675 | /** | |
1676 | * ppc440spe_adma_tasklet - clean up watch-dog initiator | |
1677 | */ | |
1678 | static void ppc440spe_adma_tasklet(unsigned long data) | |
1679 | { | |
1680 | struct ppc440spe_adma_chan *chan = (struct ppc440spe_adma_chan *) data; | |
1681 | ||
1682 | spin_lock_nested(&chan->lock, SINGLE_DEPTH_NESTING); | |
1683 | __ppc440spe_adma_slot_cleanup(chan); | |
1684 | spin_unlock(&chan->lock); | |
1685 | } | |
1686 | ||
1687 | /** | |
1688 | * ppc440spe_adma_slot_cleanup - clean up scheduled initiator | |
1689 | */ | |
1690 | static void ppc440spe_adma_slot_cleanup(struct ppc440spe_adma_chan *chan) | |
1691 | { | |
1692 | spin_lock_bh(&chan->lock); | |
1693 | __ppc440spe_adma_slot_cleanup(chan); | |
1694 | spin_unlock_bh(&chan->lock); | |
1695 | } | |
1696 | ||
1697 | /** | |
1698 | * ppc440spe_adma_alloc_slots - allocate free slots (if any) | |
1699 | */ | |
1700 | static struct ppc440spe_adma_desc_slot *ppc440spe_adma_alloc_slots( | |
1701 | struct ppc440spe_adma_chan *chan, int num_slots, | |
1702 | int slots_per_op) | |
1703 | { | |
1704 | struct ppc440spe_adma_desc_slot *iter = NULL, *_iter; | |
1705 | struct ppc440spe_adma_desc_slot *alloc_start = NULL; | |
1706 | struct list_head chain = LIST_HEAD_INIT(chain); | |
1707 | int slots_found, retry = 0; | |
1708 | ||
1709 | ||
1710 | BUG_ON(!num_slots || !slots_per_op); | |
1711 | /* start search from the last allocated descrtiptor | |
1712 | * if a contiguous allocation can not be found start searching | |
1713 | * from the beginning of the list | |
1714 | */ | |
1715 | retry: | |
1716 | slots_found = 0; | |
1717 | if (retry == 0) | |
1718 | iter = chan->last_used; | |
1719 | else | |
1720 | iter = list_entry(&chan->all_slots, | |
1721 | struct ppc440spe_adma_desc_slot, | |
1722 | slot_node); | |
1723 | list_for_each_entry_safe_continue(iter, _iter, &chan->all_slots, | |
1724 | slot_node) { | |
1725 | prefetch(_iter); | |
1726 | prefetch(&_iter->async_tx); | |
1727 | if (iter->slots_per_op) { | |
1728 | slots_found = 0; | |
1729 | continue; | |
1730 | } | |
1731 | ||
1732 | /* start the allocation if the slot is correctly aligned */ | |
1733 | if (!slots_found++) | |
1734 | alloc_start = iter; | |
1735 | ||
1736 | if (slots_found == num_slots) { | |
1737 | struct ppc440spe_adma_desc_slot *alloc_tail = NULL; | |
1738 | struct ppc440spe_adma_desc_slot *last_used = NULL; | |
1739 | ||
1740 | iter = alloc_start; | |
1741 | while (num_slots) { | |
1742 | int i; | |
1743 | /* pre-ack all but the last descriptor */ | |
1744 | if (num_slots != slots_per_op) | |
1745 | async_tx_ack(&iter->async_tx); | |
1746 | ||
1747 | list_add_tail(&iter->chain_node, &chain); | |
1748 | alloc_tail = iter; | |
1749 | iter->async_tx.cookie = 0; | |
1750 | iter->hw_next = NULL; | |
1751 | iter->flags = 0; | |
1752 | iter->slot_cnt = num_slots; | |
1753 | iter->xor_check_result = NULL; | |
1754 | for (i = 0; i < slots_per_op; i++) { | |
1755 | iter->slots_per_op = slots_per_op - i; | |
1756 | last_used = iter; | |
1757 | iter = list_entry(iter->slot_node.next, | |
1758 | struct ppc440spe_adma_desc_slot, | |
1759 | slot_node); | |
1760 | } | |
1761 | num_slots -= slots_per_op; | |
1762 | } | |
1763 | alloc_tail->group_head = alloc_start; | |
1764 | alloc_tail->async_tx.cookie = -EBUSY; | |
1765 | list_splice(&chain, &alloc_tail->group_list); | |
1766 | chan->last_used = last_used; | |
1767 | return alloc_tail; | |
1768 | } | |
1769 | } | |
1770 | if (!retry++) | |
1771 | goto retry; | |
1772 | ||
1773 | /* try to free some slots if the allocation fails */ | |
1774 | tasklet_schedule(&chan->irq_tasklet); | |
1775 | return NULL; | |
1776 | } | |
1777 | ||
1778 | /** | |
1779 | * ppc440spe_adma_alloc_chan_resources - allocate pools for CDB slots | |
1780 | */ | |
1781 | static int ppc440spe_adma_alloc_chan_resources(struct dma_chan *chan) | |
1782 | { | |
1783 | struct ppc440spe_adma_chan *ppc440spe_chan; | |
1784 | struct ppc440spe_adma_desc_slot *slot = NULL; | |
1785 | char *hw_desc; | |
1786 | int i, db_sz; | |
1787 | int init; | |
1788 | ||
1789 | ppc440spe_chan = to_ppc440spe_adma_chan(chan); | |
1790 | init = ppc440spe_chan->slots_allocated ? 0 : 1; | |
1791 | chan->chan_id = ppc440spe_chan->device->id; | |
1792 | ||
1793 | /* Allocate descriptor slots */ | |
1794 | i = ppc440spe_chan->slots_allocated; | |
1795 | if (ppc440spe_chan->device->id != PPC440SPE_XOR_ID) | |
1796 | db_sz = sizeof(struct dma_cdb); | |
1797 | else | |
1798 | db_sz = sizeof(struct xor_cb); | |
1799 | ||
1800 | for (; i < (ppc440spe_chan->device->pool_size / db_sz); i++) { | |
1801 | slot = kzalloc(sizeof(struct ppc440spe_adma_desc_slot), | |
1802 | GFP_KERNEL); | |
1803 | if (!slot) { | |
1804 | printk(KERN_INFO "SPE ADMA Channel only initialized" | |
1805 | " %d descriptor slots", i--); | |
1806 | break; | |
1807 | } | |
1808 | ||
1809 | hw_desc = (char *) ppc440spe_chan->device->dma_desc_pool_virt; | |
1810 | slot->hw_desc = (void *) &hw_desc[i * db_sz]; | |
1811 | dma_async_tx_descriptor_init(&slot->async_tx, chan); | |
1812 | slot->async_tx.tx_submit = ppc440spe_adma_tx_submit; | |
1813 | INIT_LIST_HEAD(&slot->chain_node); | |
1814 | INIT_LIST_HEAD(&slot->slot_node); | |
1815 | INIT_LIST_HEAD(&slot->group_list); | |
1816 | slot->phys = ppc440spe_chan->device->dma_desc_pool + i * db_sz; | |
1817 | slot->idx = i; | |
1818 | ||
1819 | spin_lock_bh(&ppc440spe_chan->lock); | |
1820 | ppc440spe_chan->slots_allocated++; | |
1821 | list_add_tail(&slot->slot_node, &ppc440spe_chan->all_slots); | |
1822 | spin_unlock_bh(&ppc440spe_chan->lock); | |
1823 | } | |
1824 | ||
1825 | if (i && !ppc440spe_chan->last_used) { | |
1826 | ppc440spe_chan->last_used = | |
1827 | list_entry(ppc440spe_chan->all_slots.next, | |
1828 | struct ppc440spe_adma_desc_slot, | |
1829 | slot_node); | |
1830 | } | |
1831 | ||
1832 | dev_dbg(ppc440spe_chan->device->common.dev, | |
1833 | "ppc440spe adma%d: allocated %d descriptor slots\n", | |
1834 | ppc440spe_chan->device->id, i); | |
1835 | ||
1836 | /* initialize the channel and the chain with a null operation */ | |
1837 | if (init) { | |
1838 | switch (ppc440spe_chan->device->id) { | |
1839 | case PPC440SPE_DMA0_ID: | |
1840 | case PPC440SPE_DMA1_ID: | |
1841 | ppc440spe_chan->hw_chain_inited = 0; | |
1842 | /* Use WXOR for self-testing */ | |
1843 | if (!ppc440spe_r6_tchan) | |
1844 | ppc440spe_r6_tchan = ppc440spe_chan; | |
1845 | break; | |
1846 | case PPC440SPE_XOR_ID: | |
1847 | ppc440spe_chan_start_null_xor(ppc440spe_chan); | |
1848 | break; | |
1849 | default: | |
1850 | BUG(); | |
1851 | } | |
1852 | ppc440spe_chan->needs_unmap = 1; | |
1853 | } | |
1854 | ||
1855 | return (i > 0) ? i : -ENOMEM; | |
1856 | } | |
1857 | ||
12458ea0 AG |
1858 | /** |
1859 | * ppc440spe_rxor_set_region_data - | |
1860 | */ | |
1861 | static void ppc440spe_rxor_set_region(struct ppc440spe_adma_desc_slot *desc, | |
1862 | u8 xor_arg_no, u32 mask) | |
1863 | { | |
1864 | struct xor_cb *xcb = desc->hw_desc; | |
1865 | ||
1866 | xcb->ops[xor_arg_no].h |= mask; | |
1867 | } | |
1868 | ||
1869 | /** | |
1870 | * ppc440spe_rxor_set_src - | |
1871 | */ | |
1872 | static void ppc440spe_rxor_set_src(struct ppc440spe_adma_desc_slot *desc, | |
1873 | u8 xor_arg_no, dma_addr_t addr) | |
1874 | { | |
1875 | struct xor_cb *xcb = desc->hw_desc; | |
1876 | ||
1877 | xcb->ops[xor_arg_no].h |= DMA_CUED_XOR_BASE; | |
1878 | xcb->ops[xor_arg_no].l = addr; | |
1879 | } | |
1880 | ||
1881 | /** | |
1882 | * ppc440spe_rxor_set_mult - | |
1883 | */ | |
1884 | static void ppc440spe_rxor_set_mult(struct ppc440spe_adma_desc_slot *desc, | |
1885 | u8 xor_arg_no, u8 idx, u8 mult) | |
1886 | { | |
1887 | struct xor_cb *xcb = desc->hw_desc; | |
1888 | ||
1889 | xcb->ops[xor_arg_no].h |= mult << (DMA_CUED_MULT1_OFF + idx * 8); | |
1890 | } | |
1891 | ||
1892 | /** | |
1893 | * ppc440spe_adma_check_threshold - append CDBs to h/w chain if threshold | |
1894 | * has been achieved | |
1895 | */ | |
1896 | static void ppc440spe_adma_check_threshold(struct ppc440spe_adma_chan *chan) | |
1897 | { | |
1898 | dev_dbg(chan->device->common.dev, "ppc440spe adma%d: pending: %d\n", | |
1899 | chan->device->id, chan->pending); | |
1900 | ||
1901 | if (chan->pending >= PPC440SPE_ADMA_THRESHOLD) { | |
1902 | chan->pending = 0; | |
1903 | ppc440spe_chan_append(chan); | |
1904 | } | |
1905 | } | |
1906 | ||
1907 | /** | |
1908 | * ppc440spe_adma_tx_submit - submit new descriptor group to the channel | |
1909 | * (it's not necessary that descriptors will be submitted to the h/w | |
1910 | * chains too right now) | |
1911 | */ | |
1912 | static dma_cookie_t ppc440spe_adma_tx_submit(struct dma_async_tx_descriptor *tx) | |
1913 | { | |
1914 | struct ppc440spe_adma_desc_slot *sw_desc; | |
1915 | struct ppc440spe_adma_chan *chan = to_ppc440spe_adma_chan(tx->chan); | |
1916 | struct ppc440spe_adma_desc_slot *group_start, *old_chain_tail; | |
1917 | int slot_cnt; | |
1918 | int slots_per_op; | |
1919 | dma_cookie_t cookie; | |
1920 | ||
1921 | sw_desc = tx_to_ppc440spe_adma_slot(tx); | |
1922 | ||
1923 | group_start = sw_desc->group_head; | |
1924 | slot_cnt = group_start->slot_cnt; | |
1925 | slots_per_op = group_start->slots_per_op; | |
1926 | ||
1927 | spin_lock_bh(&chan->lock); | |
884485e1 | 1928 | cookie = dma_cookie_assign(tx); |
12458ea0 AG |
1929 | |
1930 | if (unlikely(list_empty(&chan->chain))) { | |
1931 | /* first peer */ | |
1932 | list_splice_init(&sw_desc->group_list, &chan->chain); | |
1933 | chan_first_cdb[chan->device->id] = group_start; | |
1934 | } else { | |
1935 | /* isn't first peer, bind CDBs to chain */ | |
1936 | old_chain_tail = list_entry(chan->chain.prev, | |
1937 | struct ppc440spe_adma_desc_slot, | |
1938 | chain_node); | |
1939 | list_splice_init(&sw_desc->group_list, | |
1940 | &old_chain_tail->chain_node); | |
1941 | /* fix up the hardware chain */ | |
1942 | ppc440spe_desc_set_link(chan, old_chain_tail, group_start); | |
1943 | } | |
1944 | ||
1945 | /* increment the pending count by the number of operations */ | |
1946 | chan->pending += slot_cnt / slots_per_op; | |
1947 | ppc440spe_adma_check_threshold(chan); | |
1948 | spin_unlock_bh(&chan->lock); | |
1949 | ||
1950 | dev_dbg(chan->device->common.dev, | |
1951 | "ppc440spe adma%d: %s cookie: %d slot: %d tx %p\n", | |
1952 | chan->device->id, __func__, | |
1953 | sw_desc->async_tx.cookie, sw_desc->idx, sw_desc); | |
1954 | ||
1955 | return cookie; | |
1956 | } | |
1957 | ||
1958 | /** | |
1959 | * ppc440spe_adma_prep_dma_interrupt - prepare CDB for a pseudo DMA operation | |
1960 | */ | |
1961 | static struct dma_async_tx_descriptor *ppc440spe_adma_prep_dma_interrupt( | |
1962 | struct dma_chan *chan, unsigned long flags) | |
1963 | { | |
1964 | struct ppc440spe_adma_chan *ppc440spe_chan; | |
1965 | struct ppc440spe_adma_desc_slot *sw_desc, *group_start; | |
1966 | int slot_cnt, slots_per_op; | |
1967 | ||
1968 | ppc440spe_chan = to_ppc440spe_adma_chan(chan); | |
1969 | ||
1970 | dev_dbg(ppc440spe_chan->device->common.dev, | |
1971 | "ppc440spe adma%d: %s\n", ppc440spe_chan->device->id, | |
1972 | __func__); | |
1973 | ||
1974 | spin_lock_bh(&ppc440spe_chan->lock); | |
1975 | slot_cnt = slots_per_op = 1; | |
1976 | sw_desc = ppc440spe_adma_alloc_slots(ppc440spe_chan, slot_cnt, | |
1977 | slots_per_op); | |
1978 | if (sw_desc) { | |
1979 | group_start = sw_desc->group_head; | |
1980 | ppc440spe_desc_init_interrupt(group_start, ppc440spe_chan); | |
1981 | group_start->unmap_len = 0; | |
1982 | sw_desc->async_tx.flags = flags; | |
1983 | } | |
1984 | spin_unlock_bh(&ppc440spe_chan->lock); | |
1985 | ||
1986 | return sw_desc ? &sw_desc->async_tx : NULL; | |
1987 | } | |
1988 | ||
1989 | /** | |
1990 | * ppc440spe_adma_prep_dma_memcpy - prepare CDB for a MEMCPY operation | |
1991 | */ | |
1992 | static struct dma_async_tx_descriptor *ppc440spe_adma_prep_dma_memcpy( | |
1993 | struct dma_chan *chan, dma_addr_t dma_dest, | |
1994 | dma_addr_t dma_src, size_t len, unsigned long flags) | |
1995 | { | |
1996 | struct ppc440spe_adma_chan *ppc440spe_chan; | |
1997 | struct ppc440spe_adma_desc_slot *sw_desc, *group_start; | |
1998 | int slot_cnt, slots_per_op; | |
1999 | ||
2000 | ppc440spe_chan = to_ppc440spe_adma_chan(chan); | |
2001 | ||
2002 | if (unlikely(!len)) | |
2003 | return NULL; | |
2004 | ||
427cdf19 | 2005 | BUG_ON(len > PPC440SPE_ADMA_DMA_MAX_BYTE_COUNT); |
12458ea0 AG |
2006 | |
2007 | spin_lock_bh(&ppc440spe_chan->lock); | |
2008 | ||
2009 | dev_dbg(ppc440spe_chan->device->common.dev, | |
2010 | "ppc440spe adma%d: %s len: %u int_en %d\n", | |
2011 | ppc440spe_chan->device->id, __func__, len, | |
2012 | flags & DMA_PREP_INTERRUPT ? 1 : 0); | |
2013 | slot_cnt = slots_per_op = 1; | |
2014 | sw_desc = ppc440spe_adma_alloc_slots(ppc440spe_chan, slot_cnt, | |
2015 | slots_per_op); | |
2016 | if (sw_desc) { | |
2017 | group_start = sw_desc->group_head; | |
2018 | ppc440spe_desc_init_memcpy(group_start, flags); | |
2019 | ppc440spe_adma_set_dest(group_start, dma_dest, 0); | |
2020 | ppc440spe_adma_memcpy_xor_set_src(group_start, dma_src, 0); | |
2021 | ppc440spe_desc_set_byte_count(group_start, ppc440spe_chan, len); | |
2022 | sw_desc->unmap_len = len; | |
2023 | sw_desc->async_tx.flags = flags; | |
2024 | } | |
2025 | spin_unlock_bh(&ppc440spe_chan->lock); | |
2026 | ||
2027 | return sw_desc ? &sw_desc->async_tx : NULL; | |
2028 | } | |
2029 | ||
12458ea0 AG |
2030 | /** |
2031 | * ppc440spe_adma_prep_dma_xor - prepare CDB for a XOR operation | |
2032 | */ | |
2033 | static struct dma_async_tx_descriptor *ppc440spe_adma_prep_dma_xor( | |
2034 | struct dma_chan *chan, dma_addr_t dma_dest, | |
2035 | dma_addr_t *dma_src, u32 src_cnt, size_t len, | |
2036 | unsigned long flags) | |
2037 | { | |
2038 | struct ppc440spe_adma_chan *ppc440spe_chan; | |
2039 | struct ppc440spe_adma_desc_slot *sw_desc, *group_start; | |
2040 | int slot_cnt, slots_per_op; | |
2041 | ||
2042 | ppc440spe_chan = to_ppc440spe_adma_chan(chan); | |
2043 | ||
2044 | ADMA_LL_DBG(prep_dma_xor_dbg(ppc440spe_chan->device->id, | |
2045 | dma_dest, dma_src, src_cnt)); | |
2046 | if (unlikely(!len)) | |
2047 | return NULL; | |
427cdf19 | 2048 | BUG_ON(len > PPC440SPE_ADMA_XOR_MAX_BYTE_COUNT); |
12458ea0 AG |
2049 | |
2050 | dev_dbg(ppc440spe_chan->device->common.dev, | |
2051 | "ppc440spe adma%d: %s src_cnt: %d len: %u int_en: %d\n", | |
2052 | ppc440spe_chan->device->id, __func__, src_cnt, len, | |
2053 | flags & DMA_PREP_INTERRUPT ? 1 : 0); | |
2054 | ||
2055 | spin_lock_bh(&ppc440spe_chan->lock); | |
2056 | slot_cnt = ppc440spe_chan_xor_slot_count(len, src_cnt, &slots_per_op); | |
2057 | sw_desc = ppc440spe_adma_alloc_slots(ppc440spe_chan, slot_cnt, | |
2058 | slots_per_op); | |
2059 | if (sw_desc) { | |
2060 | group_start = sw_desc->group_head; | |
2061 | ppc440spe_desc_init_xor(group_start, src_cnt, flags); | |
2062 | ppc440spe_adma_set_dest(group_start, dma_dest, 0); | |
2063 | while (src_cnt--) | |
2064 | ppc440spe_adma_memcpy_xor_set_src(group_start, | |
2065 | dma_src[src_cnt], src_cnt); | |
2066 | ppc440spe_desc_set_byte_count(group_start, ppc440spe_chan, len); | |
2067 | sw_desc->unmap_len = len; | |
2068 | sw_desc->async_tx.flags = flags; | |
2069 | } | |
2070 | spin_unlock_bh(&ppc440spe_chan->lock); | |
2071 | ||
2072 | return sw_desc ? &sw_desc->async_tx : NULL; | |
2073 | } | |
2074 | ||
2075 | static inline void | |
2076 | ppc440spe_desc_set_xor_src_cnt(struct ppc440spe_adma_desc_slot *desc, | |
2077 | int src_cnt); | |
2078 | static void ppc440spe_init_rxor_cursor(struct ppc440spe_rxor *cursor); | |
2079 | ||
2080 | /** | |
2081 | * ppc440spe_adma_init_dma2rxor_slot - | |
2082 | */ | |
2083 | static void ppc440spe_adma_init_dma2rxor_slot( | |
2084 | struct ppc440spe_adma_desc_slot *desc, | |
2085 | dma_addr_t *src, int src_cnt) | |
2086 | { | |
2087 | int i; | |
2088 | ||
2089 | /* initialize CDB */ | |
2090 | for (i = 0; i < src_cnt; i++) { | |
2091 | ppc440spe_adma_dma2rxor_prep_src(desc, &desc->rxor_cursor, i, | |
2092 | desc->src_cnt, (u32)src[i]); | |
2093 | } | |
2094 | } | |
2095 | ||
2096 | /** | |
2097 | * ppc440spe_dma01_prep_mult - | |
2098 | * for Q operation where destination is also the source | |
2099 | */ | |
2100 | static struct ppc440spe_adma_desc_slot *ppc440spe_dma01_prep_mult( | |
2101 | struct ppc440spe_adma_chan *ppc440spe_chan, | |
2102 | dma_addr_t *dst, int dst_cnt, dma_addr_t *src, int src_cnt, | |
2103 | const unsigned char *scf, size_t len, unsigned long flags) | |
2104 | { | |
2105 | struct ppc440spe_adma_desc_slot *sw_desc = NULL; | |
2106 | unsigned long op = 0; | |
2107 | int slot_cnt; | |
2108 | ||
2109 | set_bit(PPC440SPE_DESC_WXOR, &op); | |
2110 | slot_cnt = 2; | |
2111 | ||
2112 | spin_lock_bh(&ppc440spe_chan->lock); | |
2113 | ||
2114 | /* use WXOR, each descriptor occupies one slot */ | |
2115 | sw_desc = ppc440spe_adma_alloc_slots(ppc440spe_chan, slot_cnt, 1); | |
2116 | if (sw_desc) { | |
2117 | struct ppc440spe_adma_chan *chan; | |
2118 | struct ppc440spe_adma_desc_slot *iter; | |
2119 | struct dma_cdb *hw_desc; | |
2120 | ||
2121 | chan = to_ppc440spe_adma_chan(sw_desc->async_tx.chan); | |
2122 | set_bits(op, &sw_desc->flags); | |
2123 | sw_desc->src_cnt = src_cnt; | |
2124 | sw_desc->dst_cnt = dst_cnt; | |
2125 | /* First descriptor, zero data in the destination and copy it | |
2126 | * to q page using MULTICAST transfer. | |
2127 | */ | |
2128 | iter = list_first_entry(&sw_desc->group_list, | |
2129 | struct ppc440spe_adma_desc_slot, | |
2130 | chain_node); | |
2131 | memset(iter->hw_desc, 0, sizeof(struct dma_cdb)); | |
2132 | /* set 'next' pointer */ | |
2133 | iter->hw_next = list_entry(iter->chain_node.next, | |
2134 | struct ppc440spe_adma_desc_slot, | |
2135 | chain_node); | |
2136 | clear_bit(PPC440SPE_DESC_INT, &iter->flags); | |
2137 | hw_desc = iter->hw_desc; | |
2138 | hw_desc->opc = DMA_CDB_OPC_MULTICAST; | |
2139 | ||
2140 | ppc440spe_desc_set_dest_addr(iter, chan, | |
2141 | DMA_CUED_XOR_BASE, dst[0], 0); | |
2142 | ppc440spe_desc_set_dest_addr(iter, chan, 0, dst[1], 1); | |
2143 | ppc440spe_desc_set_src_addr(iter, chan, 0, DMA_CUED_XOR_HB, | |
2144 | src[0]); | |
2145 | ppc440spe_desc_set_byte_count(iter, ppc440spe_chan, len); | |
2146 | iter->unmap_len = len; | |
2147 | ||
2148 | /* | |
2149 | * Second descriptor, multiply data from the q page | |
2150 | * and store the result in real destination. | |
2151 | */ | |
2152 | iter = list_first_entry(&iter->chain_node, | |
2153 | struct ppc440spe_adma_desc_slot, | |
2154 | chain_node); | |
2155 | memset(iter->hw_desc, 0, sizeof(struct dma_cdb)); | |
2156 | iter->hw_next = NULL; | |
2157 | if (flags & DMA_PREP_INTERRUPT) | |
2158 | set_bit(PPC440SPE_DESC_INT, &iter->flags); | |
2159 | else | |
2160 | clear_bit(PPC440SPE_DESC_INT, &iter->flags); | |
2161 | ||
2162 | hw_desc = iter->hw_desc; | |
2163 | hw_desc->opc = DMA_CDB_OPC_MV_SG1_SG2; | |
2164 | ppc440spe_desc_set_src_addr(iter, chan, 0, | |
2165 | DMA_CUED_XOR_HB, dst[1]); | |
2166 | ppc440spe_desc_set_dest_addr(iter, chan, | |
2167 | DMA_CUED_XOR_BASE, dst[0], 0); | |
2168 | ||
2169 | ppc440spe_desc_set_src_mult(iter, chan, DMA_CUED_MULT1_OFF, | |
2170 | DMA_CDB_SG_DST1, scf[0]); | |
2171 | ppc440spe_desc_set_byte_count(iter, ppc440spe_chan, len); | |
2172 | iter->unmap_len = len; | |
2173 | sw_desc->async_tx.flags = flags; | |
2174 | } | |
2175 | ||
2176 | spin_unlock_bh(&ppc440spe_chan->lock); | |
2177 | ||
2178 | return sw_desc; | |
2179 | } | |
2180 | ||
2181 | /** | |
2182 | * ppc440spe_dma01_prep_sum_product - | |
2183 | * Dx = A*(P+Pxy) + B*(Q+Qxy) operation where destination is also | |
2184 | * the source. | |
2185 | */ | |
2186 | static struct ppc440spe_adma_desc_slot *ppc440spe_dma01_prep_sum_product( | |
2187 | struct ppc440spe_adma_chan *ppc440spe_chan, | |
2188 | dma_addr_t *dst, dma_addr_t *src, int src_cnt, | |
2189 | const unsigned char *scf, size_t len, unsigned long flags) | |
2190 | { | |
2191 | struct ppc440spe_adma_desc_slot *sw_desc = NULL; | |
2192 | unsigned long op = 0; | |
2193 | int slot_cnt; | |
2194 | ||
2195 | set_bit(PPC440SPE_DESC_WXOR, &op); | |
2196 | slot_cnt = 3; | |
2197 | ||
2198 | spin_lock_bh(&ppc440spe_chan->lock); | |
2199 | ||
2200 | /* WXOR, each descriptor occupies one slot */ | |
2201 | sw_desc = ppc440spe_adma_alloc_slots(ppc440spe_chan, slot_cnt, 1); | |
2202 | if (sw_desc) { | |
2203 | struct ppc440spe_adma_chan *chan; | |
2204 | struct ppc440spe_adma_desc_slot *iter; | |
2205 | struct dma_cdb *hw_desc; | |
2206 | ||
2207 | chan = to_ppc440spe_adma_chan(sw_desc->async_tx.chan); | |
2208 | set_bits(op, &sw_desc->flags); | |
2209 | sw_desc->src_cnt = src_cnt; | |
2210 | sw_desc->dst_cnt = 1; | |
2211 | /* 1st descriptor, src[1] data to q page and zero destination */ | |
2212 | iter = list_first_entry(&sw_desc->group_list, | |
2213 | struct ppc440spe_adma_desc_slot, | |
2214 | chain_node); | |
2215 | memset(iter->hw_desc, 0, sizeof(struct dma_cdb)); | |
2216 | iter->hw_next = list_entry(iter->chain_node.next, | |
2217 | struct ppc440spe_adma_desc_slot, | |
2218 | chain_node); | |
2219 | clear_bit(PPC440SPE_DESC_INT, &iter->flags); | |
2220 | hw_desc = iter->hw_desc; | |
2221 | hw_desc->opc = DMA_CDB_OPC_MULTICAST; | |
2222 | ||
2223 | ppc440spe_desc_set_dest_addr(iter, chan, DMA_CUED_XOR_BASE, | |
2224 | *dst, 0); | |
2225 | ppc440spe_desc_set_dest_addr(iter, chan, 0, | |
2226 | ppc440spe_chan->qdest, 1); | |
2227 | ppc440spe_desc_set_src_addr(iter, chan, 0, DMA_CUED_XOR_HB, | |
2228 | src[1]); | |
2229 | ppc440spe_desc_set_byte_count(iter, ppc440spe_chan, len); | |
2230 | iter->unmap_len = len; | |
2231 | ||
2232 | /* 2nd descriptor, multiply src[1] data and store the | |
2233 | * result in destination */ | |
2234 | iter = list_first_entry(&iter->chain_node, | |
2235 | struct ppc440spe_adma_desc_slot, | |
2236 | chain_node); | |
2237 | memset(iter->hw_desc, 0, sizeof(struct dma_cdb)); | |
2238 | /* set 'next' pointer */ | |
2239 | iter->hw_next = list_entry(iter->chain_node.next, | |
2240 | struct ppc440spe_adma_desc_slot, | |
2241 | chain_node); | |
2242 | if (flags & DMA_PREP_INTERRUPT) | |
2243 | set_bit(PPC440SPE_DESC_INT, &iter->flags); | |
2244 | else | |
2245 | clear_bit(PPC440SPE_DESC_INT, &iter->flags); | |
2246 | ||
2247 | hw_desc = iter->hw_desc; | |
2248 | hw_desc->opc = DMA_CDB_OPC_MV_SG1_SG2; | |
2249 | ppc440spe_desc_set_src_addr(iter, chan, 0, DMA_CUED_XOR_HB, | |
2250 | ppc440spe_chan->qdest); | |
2251 | ppc440spe_desc_set_dest_addr(iter, chan, DMA_CUED_XOR_BASE, | |
2252 | *dst, 0); | |
2253 | ppc440spe_desc_set_src_mult(iter, chan, DMA_CUED_MULT1_OFF, | |
2254 | DMA_CDB_SG_DST1, scf[1]); | |
2255 | ppc440spe_desc_set_byte_count(iter, ppc440spe_chan, len); | |
2256 | iter->unmap_len = len; | |
2257 | ||
2258 | /* | |
2259 | * 3rd descriptor, multiply src[0] data and xor it | |
2260 | * with destination | |
2261 | */ | |
2262 | iter = list_first_entry(&iter->chain_node, | |
2263 | struct ppc440spe_adma_desc_slot, | |
2264 | chain_node); | |
2265 | memset(iter->hw_desc, 0, sizeof(struct dma_cdb)); | |
2266 | iter->hw_next = NULL; | |
2267 | if (flags & DMA_PREP_INTERRUPT) | |
2268 | set_bit(PPC440SPE_DESC_INT, &iter->flags); | |
2269 | else | |
2270 | clear_bit(PPC440SPE_DESC_INT, &iter->flags); | |
2271 | ||
2272 | hw_desc = iter->hw_desc; | |
2273 | hw_desc->opc = DMA_CDB_OPC_MV_SG1_SG2; | |
2274 | ppc440spe_desc_set_src_addr(iter, chan, 0, DMA_CUED_XOR_HB, | |
2275 | src[0]); | |
2276 | ppc440spe_desc_set_dest_addr(iter, chan, DMA_CUED_XOR_BASE, | |
2277 | *dst, 0); | |
2278 | ppc440spe_desc_set_src_mult(iter, chan, DMA_CUED_MULT1_OFF, | |
2279 | DMA_CDB_SG_DST1, scf[0]); | |
2280 | ppc440spe_desc_set_byte_count(iter, ppc440spe_chan, len); | |
2281 | iter->unmap_len = len; | |
2282 | sw_desc->async_tx.flags = flags; | |
2283 | } | |
2284 | ||
2285 | spin_unlock_bh(&ppc440spe_chan->lock); | |
2286 | ||
2287 | return sw_desc; | |
2288 | } | |
2289 | ||
2290 | static struct ppc440spe_adma_desc_slot *ppc440spe_dma01_prep_pq( | |
2291 | struct ppc440spe_adma_chan *ppc440spe_chan, | |
2292 | dma_addr_t *dst, int dst_cnt, dma_addr_t *src, int src_cnt, | |
2293 | const unsigned char *scf, size_t len, unsigned long flags) | |
2294 | { | |
2295 | int slot_cnt; | |
2296 | struct ppc440spe_adma_desc_slot *sw_desc = NULL, *iter; | |
2297 | unsigned long op = 0; | |
2298 | unsigned char mult = 1; | |
2299 | ||
2300 | pr_debug("%s: dst_cnt %d, src_cnt %d, len %d\n", | |
2301 | __func__, dst_cnt, src_cnt, len); | |
2302 | /* select operations WXOR/RXOR depending on the | |
2303 | * source addresses of operators and the number | |
2304 | * of destinations (RXOR support only Q-parity calculations) | |
2305 | */ | |
2306 | set_bit(PPC440SPE_DESC_WXOR, &op); | |
2307 | if (!test_and_set_bit(PPC440SPE_RXOR_RUN, &ppc440spe_rxor_state)) { | |
2308 | /* no active RXOR; | |
2309 | * do RXOR if: | |
2310 | * - there are more than 1 source, | |
2311 | * - len is aligned on 512-byte boundary, | |
2312 | * - source addresses fit to one of 4 possible regions. | |
2313 | */ | |
2314 | if (src_cnt > 1 && | |
2315 | !(len & MQ0_CF2H_RXOR_BS_MASK) && | |
2316 | (src[0] + len) == src[1]) { | |
2317 | /* may do RXOR R1 R2 */ | |
2318 | set_bit(PPC440SPE_DESC_RXOR, &op); | |
2319 | if (src_cnt != 2) { | |
2320 | /* may try to enhance region of RXOR */ | |
2321 | if ((src[1] + len) == src[2]) { | |
2322 | /* do RXOR R1 R2 R3 */ | |
2323 | set_bit(PPC440SPE_DESC_RXOR123, | |
2324 | &op); | |
2325 | } else if ((src[1] + len * 2) == src[2]) { | |
2326 | /* do RXOR R1 R2 R4 */ | |
2327 | set_bit(PPC440SPE_DESC_RXOR124, &op); | |
2328 | } else if ((src[1] + len * 3) == src[2]) { | |
2329 | /* do RXOR R1 R2 R5 */ | |
2330 | set_bit(PPC440SPE_DESC_RXOR125, | |
2331 | &op); | |
2332 | } else { | |
2333 | /* do RXOR R1 R2 */ | |
2334 | set_bit(PPC440SPE_DESC_RXOR12, | |
2335 | &op); | |
2336 | } | |
2337 | } else { | |
2338 | /* do RXOR R1 R2 */ | |
2339 | set_bit(PPC440SPE_DESC_RXOR12, &op); | |
2340 | } | |
2341 | } | |
2342 | ||
2343 | if (!test_bit(PPC440SPE_DESC_RXOR, &op)) { | |
2344 | /* can not do this operation with RXOR */ | |
2345 | clear_bit(PPC440SPE_RXOR_RUN, | |
2346 | &ppc440spe_rxor_state); | |
2347 | } else { | |
2348 | /* can do; set block size right now */ | |
2349 | ppc440spe_desc_set_rxor_block_size(len); | |
2350 | } | |
2351 | } | |
2352 | ||
2353 | /* Number of necessary slots depends on operation type selected */ | |
2354 | if (!test_bit(PPC440SPE_DESC_RXOR, &op)) { | |
2355 | /* This is a WXOR only chain. Need descriptors for each | |
2356 | * source to GF-XOR them with WXOR, and need descriptors | |
2357 | * for each destination to zero them with WXOR | |
2358 | */ | |
2359 | slot_cnt = src_cnt; | |
2360 | ||
2361 | if (flags & DMA_PREP_ZERO_P) { | |
2362 | slot_cnt++; | |
2363 | set_bit(PPC440SPE_ZERO_P, &op); | |
2364 | } | |
2365 | if (flags & DMA_PREP_ZERO_Q) { | |
2366 | slot_cnt++; | |
2367 | set_bit(PPC440SPE_ZERO_Q, &op); | |
2368 | } | |
2369 | } else { | |
2370 | /* Need 1/2 descriptor for RXOR operation, and | |
2371 | * need (src_cnt - (2 or 3)) for WXOR of sources | |
2372 | * remained (if any) | |
2373 | */ | |
2374 | slot_cnt = dst_cnt; | |
2375 | ||
2376 | if (flags & DMA_PREP_ZERO_P) | |
2377 | set_bit(PPC440SPE_ZERO_P, &op); | |
2378 | if (flags & DMA_PREP_ZERO_Q) | |
2379 | set_bit(PPC440SPE_ZERO_Q, &op); | |
2380 | ||
2381 | if (test_bit(PPC440SPE_DESC_RXOR12, &op)) | |
2382 | slot_cnt += src_cnt - 2; | |
2383 | else | |
2384 | slot_cnt += src_cnt - 3; | |
2385 | ||
2386 | /* Thus we have either RXOR only chain or | |
2387 | * mixed RXOR/WXOR | |
2388 | */ | |
2389 | if (slot_cnt == dst_cnt) | |
2390 | /* RXOR only chain */ | |
2391 | clear_bit(PPC440SPE_DESC_WXOR, &op); | |
2392 | } | |
2393 | ||
2394 | spin_lock_bh(&ppc440spe_chan->lock); | |
2395 | /* for both RXOR/WXOR each descriptor occupies one slot */ | |
2396 | sw_desc = ppc440spe_adma_alloc_slots(ppc440spe_chan, slot_cnt, 1); | |
2397 | if (sw_desc) { | |
2398 | ppc440spe_desc_init_dma01pq(sw_desc, dst_cnt, src_cnt, | |
2399 | flags, op); | |
2400 | ||
2401 | /* setup dst/src/mult */ | |
2402 | pr_debug("%s: set dst descriptor 0, 1: 0x%016llx, 0x%016llx\n", | |
2403 | __func__, dst[0], dst[1]); | |
2404 | ppc440spe_adma_pq_set_dest(sw_desc, dst, flags); | |
2405 | while (src_cnt--) { | |
2406 | ppc440spe_adma_pq_set_src(sw_desc, src[src_cnt], | |
2407 | src_cnt); | |
2408 | ||
2409 | /* NOTE: "Multi = 0 is equivalent to = 1" as it | |
2410 | * stated in 440SPSPe_RAID6_Addendum_UM_1_17.pdf | |
2411 | * doesn't work for RXOR with DMA0/1! Instead, multi=0 | |
2412 | * leads to zeroing source data after RXOR. | |
2413 | * So, for P case set-up mult=1 explicitly. | |
2414 | */ | |
2415 | if (!(flags & DMA_PREP_PQ_DISABLE_Q)) | |
2416 | mult = scf[src_cnt]; | |
2417 | ppc440spe_adma_pq_set_src_mult(sw_desc, | |
2418 | mult, src_cnt, dst_cnt - 1); | |
2419 | } | |
2420 | ||
2421 | /* Setup byte count foreach slot just allocated */ | |
2422 | sw_desc->async_tx.flags = flags; | |
2423 | list_for_each_entry(iter, &sw_desc->group_list, | |
2424 | chain_node) { | |
2425 | ppc440spe_desc_set_byte_count(iter, | |
2426 | ppc440spe_chan, len); | |
2427 | iter->unmap_len = len; | |
2428 | } | |
2429 | } | |
2430 | spin_unlock_bh(&ppc440spe_chan->lock); | |
2431 | ||
2432 | return sw_desc; | |
2433 | } | |
2434 | ||
2435 | static struct ppc440spe_adma_desc_slot *ppc440spe_dma2_prep_pq( | |
2436 | struct ppc440spe_adma_chan *ppc440spe_chan, | |
2437 | dma_addr_t *dst, int dst_cnt, dma_addr_t *src, int src_cnt, | |
2438 | const unsigned char *scf, size_t len, unsigned long flags) | |
2439 | { | |
2440 | int slot_cnt, descs_per_op; | |
2441 | struct ppc440spe_adma_desc_slot *sw_desc = NULL, *iter; | |
2442 | unsigned long op = 0; | |
2443 | unsigned char mult = 1; | |
2444 | ||
2445 | BUG_ON(!dst_cnt); | |
2446 | /*pr_debug("%s: dst_cnt %d, src_cnt %d, len %d\n", | |
2447 | __func__, dst_cnt, src_cnt, len);*/ | |
2448 | ||
2449 | spin_lock_bh(&ppc440spe_chan->lock); | |
2450 | descs_per_op = ppc440spe_dma2_pq_slot_count(src, src_cnt, len); | |
2451 | if (descs_per_op < 0) { | |
2452 | spin_unlock_bh(&ppc440spe_chan->lock); | |
2453 | return NULL; | |
2454 | } | |
2455 | ||
2456 | /* depending on number of sources we have 1 or 2 RXOR chains */ | |
2457 | slot_cnt = descs_per_op * dst_cnt; | |
2458 | ||
2459 | sw_desc = ppc440spe_adma_alloc_slots(ppc440spe_chan, slot_cnt, 1); | |
2460 | if (sw_desc) { | |
2461 | op = slot_cnt; | |
2462 | sw_desc->async_tx.flags = flags; | |
2463 | list_for_each_entry(iter, &sw_desc->group_list, chain_node) { | |
2464 | ppc440spe_desc_init_dma2pq(iter, dst_cnt, src_cnt, | |
2465 | --op ? 0 : flags); | |
2466 | ppc440spe_desc_set_byte_count(iter, ppc440spe_chan, | |
2467 | len); | |
2468 | iter->unmap_len = len; | |
2469 | ||
2470 | ppc440spe_init_rxor_cursor(&(iter->rxor_cursor)); | |
2471 | iter->rxor_cursor.len = len; | |
2472 | iter->descs_per_op = descs_per_op; | |
2473 | } | |
2474 | op = 0; | |
2475 | list_for_each_entry(iter, &sw_desc->group_list, chain_node) { | |
2476 | op++; | |
2477 | if (op % descs_per_op == 0) | |
2478 | ppc440spe_adma_init_dma2rxor_slot(iter, src, | |
2479 | src_cnt); | |
2480 | if (likely(!list_is_last(&iter->chain_node, | |
2481 | &sw_desc->group_list))) { | |
2482 | /* set 'next' pointer */ | |
2483 | iter->hw_next = | |
2484 | list_entry(iter->chain_node.next, | |
2485 | struct ppc440spe_adma_desc_slot, | |
2486 | chain_node); | |
2487 | ppc440spe_xor_set_link(iter, iter->hw_next); | |
2488 | } else { | |
2489 | /* this is the last descriptor. */ | |
2490 | iter->hw_next = NULL; | |
2491 | } | |
2492 | } | |
2493 | ||
2494 | /* fixup head descriptor */ | |
2495 | sw_desc->dst_cnt = dst_cnt; | |
2496 | if (flags & DMA_PREP_ZERO_P) | |
2497 | set_bit(PPC440SPE_ZERO_P, &sw_desc->flags); | |
2498 | if (flags & DMA_PREP_ZERO_Q) | |
2499 | set_bit(PPC440SPE_ZERO_Q, &sw_desc->flags); | |
2500 | ||
2501 | /* setup dst/src/mult */ | |
2502 | ppc440spe_adma_pq_set_dest(sw_desc, dst, flags); | |
2503 | ||
2504 | while (src_cnt--) { | |
2505 | /* handle descriptors (if dst_cnt == 2) inside | |
2506 | * the ppc440spe_adma_pq_set_srcxxx() functions | |
2507 | */ | |
2508 | ppc440spe_adma_pq_set_src(sw_desc, src[src_cnt], | |
2509 | src_cnt); | |
2510 | if (!(flags & DMA_PREP_PQ_DISABLE_Q)) | |
2511 | mult = scf[src_cnt]; | |
2512 | ppc440spe_adma_pq_set_src_mult(sw_desc, | |
2513 | mult, src_cnt, dst_cnt - 1); | |
2514 | } | |
2515 | } | |
2516 | spin_unlock_bh(&ppc440spe_chan->lock); | |
2517 | ppc440spe_desc_set_rxor_block_size(len); | |
2518 | return sw_desc; | |
2519 | } | |
2520 | ||
2521 | /** | |
2522 | * ppc440spe_adma_prep_dma_pq - prepare CDB (group) for a GF-XOR operation | |
2523 | */ | |
2524 | static struct dma_async_tx_descriptor *ppc440spe_adma_prep_dma_pq( | |
2525 | struct dma_chan *chan, dma_addr_t *dst, dma_addr_t *src, | |
2526 | unsigned int src_cnt, const unsigned char *scf, | |
2527 | size_t len, unsigned long flags) | |
2528 | { | |
2529 | struct ppc440spe_adma_chan *ppc440spe_chan; | |
2530 | struct ppc440spe_adma_desc_slot *sw_desc = NULL; | |
2531 | int dst_cnt = 0; | |
2532 | ||
2533 | ppc440spe_chan = to_ppc440spe_adma_chan(chan); | |
2534 | ||
2535 | ADMA_LL_DBG(prep_dma_pq_dbg(ppc440spe_chan->device->id, | |
2536 | dst, src, src_cnt)); | |
2537 | BUG_ON(!len); | |
427cdf19 | 2538 | BUG_ON(len > PPC440SPE_ADMA_XOR_MAX_BYTE_COUNT); |
12458ea0 AG |
2539 | BUG_ON(!src_cnt); |
2540 | ||
2541 | if (src_cnt == 1 && dst[1] == src[0]) { | |
2542 | dma_addr_t dest[2]; | |
2543 | ||
2544 | /* dst[1] is real destination (Q) */ | |
2545 | dest[0] = dst[1]; | |
2546 | /* this is the page to multicast source data to */ | |
2547 | dest[1] = ppc440spe_chan->qdest; | |
2548 | sw_desc = ppc440spe_dma01_prep_mult(ppc440spe_chan, | |
2549 | dest, 2, src, src_cnt, scf, len, flags); | |
2550 | return sw_desc ? &sw_desc->async_tx : NULL; | |
2551 | } | |
2552 | ||
2553 | if (src_cnt == 2 && dst[1] == src[1]) { | |
2554 | sw_desc = ppc440spe_dma01_prep_sum_product(ppc440spe_chan, | |
2555 | &dst[1], src, 2, scf, len, flags); | |
2556 | return sw_desc ? &sw_desc->async_tx : NULL; | |
2557 | } | |
2558 | ||
2559 | if (!(flags & DMA_PREP_PQ_DISABLE_P)) { | |
2560 | BUG_ON(!dst[0]); | |
2561 | dst_cnt++; | |
2562 | flags |= DMA_PREP_ZERO_P; | |
2563 | } | |
2564 | ||
2565 | if (!(flags & DMA_PREP_PQ_DISABLE_Q)) { | |
2566 | BUG_ON(!dst[1]); | |
2567 | dst_cnt++; | |
2568 | flags |= DMA_PREP_ZERO_Q; | |
2569 | } | |
2570 | ||
2571 | BUG_ON(!dst_cnt); | |
2572 | ||
2573 | dev_dbg(ppc440spe_chan->device->common.dev, | |
2574 | "ppc440spe adma%d: %s src_cnt: %d len: %u int_en: %d\n", | |
2575 | ppc440spe_chan->device->id, __func__, src_cnt, len, | |
2576 | flags & DMA_PREP_INTERRUPT ? 1 : 0); | |
2577 | ||
2578 | switch (ppc440spe_chan->device->id) { | |
2579 | case PPC440SPE_DMA0_ID: | |
2580 | case PPC440SPE_DMA1_ID: | |
2581 | sw_desc = ppc440spe_dma01_prep_pq(ppc440spe_chan, | |
2582 | dst, dst_cnt, src, src_cnt, scf, | |
2583 | len, flags); | |
2584 | break; | |
2585 | ||
2586 | case PPC440SPE_XOR_ID: | |
2587 | sw_desc = ppc440spe_dma2_prep_pq(ppc440spe_chan, | |
2588 | dst, dst_cnt, src, src_cnt, scf, | |
2589 | len, flags); | |
2590 | break; | |
2591 | } | |
2592 | ||
2593 | return sw_desc ? &sw_desc->async_tx : NULL; | |
2594 | } | |
2595 | ||
2596 | /** | |
2597 | * ppc440spe_adma_prep_dma_pqzero_sum - prepare CDB group for | |
2598 | * a PQ_ZERO_SUM operation | |
2599 | */ | |
2600 | static struct dma_async_tx_descriptor *ppc440spe_adma_prep_dma_pqzero_sum( | |
2601 | struct dma_chan *chan, dma_addr_t *pq, dma_addr_t *src, | |
2602 | unsigned int src_cnt, const unsigned char *scf, size_t len, | |
2603 | enum sum_check_flags *pqres, unsigned long flags) | |
2604 | { | |
2605 | struct ppc440spe_adma_chan *ppc440spe_chan; | |
2606 | struct ppc440spe_adma_desc_slot *sw_desc, *iter; | |
2607 | dma_addr_t pdest, qdest; | |
2608 | int slot_cnt, slots_per_op, idst, dst_cnt; | |
2609 | ||
2610 | ppc440spe_chan = to_ppc440spe_adma_chan(chan); | |
2611 | ||
2612 | if (flags & DMA_PREP_PQ_DISABLE_P) | |
2613 | pdest = 0; | |
2614 | else | |
2615 | pdest = pq[0]; | |
2616 | ||
2617 | if (flags & DMA_PREP_PQ_DISABLE_Q) | |
2618 | qdest = 0; | |
2619 | else | |
2620 | qdest = pq[1]; | |
2621 | ||
2622 | ADMA_LL_DBG(prep_dma_pqzero_sum_dbg(ppc440spe_chan->device->id, | |
2623 | src, src_cnt, scf)); | |
2624 | ||
2625 | /* Always use WXOR for P/Q calculations (two destinations). | |
2626 | * Need 1 or 2 extra slots to verify results are zero. | |
2627 | */ | |
2628 | idst = dst_cnt = (pdest && qdest) ? 2 : 1; | |
2629 | ||
2630 | /* One additional slot per destination to clone P/Q | |
2631 | * before calculation (we have to preserve destinations). | |
2632 | */ | |
2633 | slot_cnt = src_cnt + dst_cnt * 2; | |
2634 | slots_per_op = 1; | |
2635 | ||
2636 | spin_lock_bh(&ppc440spe_chan->lock); | |
2637 | sw_desc = ppc440spe_adma_alloc_slots(ppc440spe_chan, slot_cnt, | |
2638 | slots_per_op); | |
2639 | if (sw_desc) { | |
2640 | ppc440spe_desc_init_dma01pqzero_sum(sw_desc, dst_cnt, src_cnt); | |
2641 | ||
2642 | /* Setup byte count for each slot just allocated */ | |
2643 | sw_desc->async_tx.flags = flags; | |
2644 | list_for_each_entry(iter, &sw_desc->group_list, chain_node) { | |
2645 | ppc440spe_desc_set_byte_count(iter, ppc440spe_chan, | |
2646 | len); | |
2647 | iter->unmap_len = len; | |
2648 | } | |
2649 | ||
2650 | if (pdest) { | |
2651 | struct dma_cdb *hw_desc; | |
2652 | struct ppc440spe_adma_chan *chan; | |
2653 | ||
2654 | iter = sw_desc->group_head; | |
2655 | chan = to_ppc440spe_adma_chan(iter->async_tx.chan); | |
2656 | memset(iter->hw_desc, 0, sizeof(struct dma_cdb)); | |
2657 | iter->hw_next = list_entry(iter->chain_node.next, | |
2658 | struct ppc440spe_adma_desc_slot, | |
2659 | chain_node); | |
2660 | hw_desc = iter->hw_desc; | |
2661 | hw_desc->opc = DMA_CDB_OPC_MV_SG1_SG2; | |
2662 | iter->src_cnt = 0; | |
2663 | iter->dst_cnt = 0; | |
2664 | ppc440spe_desc_set_dest_addr(iter, chan, 0, | |
2665 | ppc440spe_chan->pdest, 0); | |
2666 | ppc440spe_desc_set_src_addr(iter, chan, 0, 0, pdest); | |
2667 | ppc440spe_desc_set_byte_count(iter, ppc440spe_chan, | |
2668 | len); | |
2669 | iter->unmap_len = 0; | |
2670 | /* override pdest to preserve original P */ | |
2671 | pdest = ppc440spe_chan->pdest; | |
2672 | } | |
2673 | if (qdest) { | |
2674 | struct dma_cdb *hw_desc; | |
2675 | struct ppc440spe_adma_chan *chan; | |
2676 | ||
2677 | iter = list_first_entry(&sw_desc->group_list, | |
2678 | struct ppc440spe_adma_desc_slot, | |
2679 | chain_node); | |
2680 | chan = to_ppc440spe_adma_chan(iter->async_tx.chan); | |
2681 | ||
2682 | if (pdest) { | |
2683 | iter = list_entry(iter->chain_node.next, | |
2684 | struct ppc440spe_adma_desc_slot, | |
2685 | chain_node); | |
2686 | } | |
2687 | ||
2688 | memset(iter->hw_desc, 0, sizeof(struct dma_cdb)); | |
2689 | iter->hw_next = list_entry(iter->chain_node.next, | |
2690 | struct ppc440spe_adma_desc_slot, | |
2691 | chain_node); | |
2692 | hw_desc = iter->hw_desc; | |
2693 | hw_desc->opc = DMA_CDB_OPC_MV_SG1_SG2; | |
2694 | iter->src_cnt = 0; | |
2695 | iter->dst_cnt = 0; | |
2696 | ppc440spe_desc_set_dest_addr(iter, chan, 0, | |
2697 | ppc440spe_chan->qdest, 0); | |
2698 | ppc440spe_desc_set_src_addr(iter, chan, 0, 0, qdest); | |
2699 | ppc440spe_desc_set_byte_count(iter, ppc440spe_chan, | |
2700 | len); | |
2701 | iter->unmap_len = 0; | |
2702 | /* override qdest to preserve original Q */ | |
2703 | qdest = ppc440spe_chan->qdest; | |
2704 | } | |
2705 | ||
2706 | /* Setup destinations for P/Q ops */ | |
2707 | ppc440spe_adma_pqzero_sum_set_dest(sw_desc, pdest, qdest); | |
2708 | ||
2709 | /* Setup zero QWORDs into DCHECK CDBs */ | |
2710 | idst = dst_cnt; | |
2711 | list_for_each_entry_reverse(iter, &sw_desc->group_list, | |
2712 | chain_node) { | |
2713 | /* | |
2714 | * The last CDB corresponds to Q-parity check, | |
2715 | * the one before last CDB corresponds | |
2716 | * P-parity check | |
2717 | */ | |
2718 | if (idst == DMA_DEST_MAX_NUM) { | |
2719 | if (idst == dst_cnt) { | |
2720 | set_bit(PPC440SPE_DESC_QCHECK, | |
2721 | &iter->flags); | |
2722 | } else { | |
2723 | set_bit(PPC440SPE_DESC_PCHECK, | |
2724 | &iter->flags); | |
2725 | } | |
2726 | } else { | |
2727 | if (qdest) { | |
2728 | set_bit(PPC440SPE_DESC_QCHECK, | |
2729 | &iter->flags); | |
2730 | } else { | |
2731 | set_bit(PPC440SPE_DESC_PCHECK, | |
2732 | &iter->flags); | |
2733 | } | |
2734 | } | |
2735 | iter->xor_check_result = pqres; | |
2736 | ||
2737 | /* | |
2738 | * set it to zero, if check fail then result will | |
2739 | * be updated | |
2740 | */ | |
2741 | *iter->xor_check_result = 0; | |
2742 | ppc440spe_desc_set_dcheck(iter, ppc440spe_chan, | |
2743 | ppc440spe_qword); | |
2744 | ||
2745 | if (!(--dst_cnt)) | |
2746 | break; | |
2747 | } | |
2748 | ||
2749 | /* Setup sources and mults for P/Q ops */ | |
2750 | list_for_each_entry_continue_reverse(iter, &sw_desc->group_list, | |
2751 | chain_node) { | |
2752 | struct ppc440spe_adma_chan *chan; | |
2753 | u32 mult_dst; | |
2754 | ||
2755 | chan = to_ppc440spe_adma_chan(iter->async_tx.chan); | |
2756 | ppc440spe_desc_set_src_addr(iter, chan, 0, | |
2757 | DMA_CUED_XOR_HB, | |
2758 | src[src_cnt - 1]); | |
2759 | if (qdest) { | |
2760 | mult_dst = (dst_cnt - 1) ? DMA_CDB_SG_DST2 : | |
2761 | DMA_CDB_SG_DST1; | |
2762 | ppc440spe_desc_set_src_mult(iter, chan, | |
2763 | DMA_CUED_MULT1_OFF, | |
2764 | mult_dst, | |
2765 | scf[src_cnt - 1]); | |
2766 | } | |
2767 | if (!(--src_cnt)) | |
2768 | break; | |
2769 | } | |
2770 | } | |
2771 | spin_unlock_bh(&ppc440spe_chan->lock); | |
2772 | return sw_desc ? &sw_desc->async_tx : NULL; | |
2773 | } | |
2774 | ||
2775 | /** | |
2776 | * ppc440spe_adma_prep_dma_xor_zero_sum - prepare CDB group for | |
2777 | * XOR ZERO_SUM operation | |
2778 | */ | |
2779 | static struct dma_async_tx_descriptor *ppc440spe_adma_prep_dma_xor_zero_sum( | |
2780 | struct dma_chan *chan, dma_addr_t *src, unsigned int src_cnt, | |
2781 | size_t len, enum sum_check_flags *result, unsigned long flags) | |
2782 | { | |
2783 | struct dma_async_tx_descriptor *tx; | |
2784 | dma_addr_t pq[2]; | |
2785 | ||
2786 | /* validate P, disable Q */ | |
2787 | pq[0] = src[0]; | |
2788 | pq[1] = 0; | |
2789 | flags |= DMA_PREP_PQ_DISABLE_Q; | |
2790 | ||
2791 | tx = ppc440spe_adma_prep_dma_pqzero_sum(chan, pq, &src[1], | |
2792 | src_cnt - 1, 0, len, | |
2793 | result, flags); | |
2794 | return tx; | |
2795 | } | |
2796 | ||
2797 | /** | |
2798 | * ppc440spe_adma_set_dest - set destination address into descriptor | |
2799 | */ | |
2800 | static void ppc440spe_adma_set_dest(struct ppc440spe_adma_desc_slot *sw_desc, | |
2801 | dma_addr_t addr, int index) | |
2802 | { | |
2803 | struct ppc440spe_adma_chan *chan; | |
2804 | ||
2805 | BUG_ON(index >= sw_desc->dst_cnt); | |
2806 | ||
2807 | chan = to_ppc440spe_adma_chan(sw_desc->async_tx.chan); | |
2808 | ||
2809 | switch (chan->device->id) { | |
2810 | case PPC440SPE_DMA0_ID: | |
2811 | case PPC440SPE_DMA1_ID: | |
2812 | /* to do: support transfers lengths > | |
2813 | * PPC440SPE_ADMA_DMA/XOR_MAX_BYTE_COUNT | |
2814 | */ | |
2815 | ppc440spe_desc_set_dest_addr(sw_desc->group_head, | |
2816 | chan, 0, addr, index); | |
2817 | break; | |
2818 | case PPC440SPE_XOR_ID: | |
2819 | sw_desc = ppc440spe_get_group_entry(sw_desc, index); | |
2820 | ppc440spe_desc_set_dest_addr(sw_desc, | |
2821 | chan, 0, addr, index); | |
2822 | break; | |
2823 | } | |
2824 | } | |
2825 | ||
2826 | static void ppc440spe_adma_pq_zero_op(struct ppc440spe_adma_desc_slot *iter, | |
2827 | struct ppc440spe_adma_chan *chan, dma_addr_t addr) | |
2828 | { | |
2829 | /* To clear destinations update the descriptor | |
2830 | * (P or Q depending on index) as follows: | |
2831 | * addr is destination (0 corresponds to SG2): | |
2832 | */ | |
2833 | ppc440spe_desc_set_dest_addr(iter, chan, DMA_CUED_XOR_BASE, addr, 0); | |
2834 | ||
2835 | /* ... and the addr is source: */ | |
2836 | ppc440spe_desc_set_src_addr(iter, chan, 0, DMA_CUED_XOR_HB, addr); | |
2837 | ||
2838 | /* addr is always SG2 then the mult is always DST1 */ | |
2839 | ppc440spe_desc_set_src_mult(iter, chan, DMA_CUED_MULT1_OFF, | |
2840 | DMA_CDB_SG_DST1, 1); | |
2841 | } | |
2842 | ||
2843 | /** | |
2844 | * ppc440spe_adma_pq_set_dest - set destination address into descriptor | |
2845 | * for the PQXOR operation | |
2846 | */ | |
2847 | static void ppc440spe_adma_pq_set_dest(struct ppc440spe_adma_desc_slot *sw_desc, | |
2848 | dma_addr_t *addrs, unsigned long flags) | |
2849 | { | |
2850 | struct ppc440spe_adma_desc_slot *iter; | |
2851 | struct ppc440spe_adma_chan *chan; | |
2852 | dma_addr_t paddr, qaddr; | |
2853 | dma_addr_t addr = 0, ppath, qpath; | |
2854 | int index = 0, i; | |
2855 | ||
2856 | chan = to_ppc440spe_adma_chan(sw_desc->async_tx.chan); | |
2857 | ||
2858 | if (flags & DMA_PREP_PQ_DISABLE_P) | |
2859 | paddr = 0; | |
2860 | else | |
2861 | paddr = addrs[0]; | |
2862 | ||
2863 | if (flags & DMA_PREP_PQ_DISABLE_Q) | |
2864 | qaddr = 0; | |
2865 | else | |
2866 | qaddr = addrs[1]; | |
2867 | ||
2868 | if (!paddr || !qaddr) | |
2869 | addr = paddr ? paddr : qaddr; | |
2870 | ||
2871 | switch (chan->device->id) { | |
2872 | case PPC440SPE_DMA0_ID: | |
2873 | case PPC440SPE_DMA1_ID: | |
2874 | /* walk through the WXOR source list and set P/Q-destinations | |
2875 | * for each slot: | |
2876 | */ | |
2877 | if (!test_bit(PPC440SPE_DESC_RXOR, &sw_desc->flags)) { | |
2878 | /* This is WXOR-only chain; may have 1/2 zero descs */ | |
2879 | if (test_bit(PPC440SPE_ZERO_P, &sw_desc->flags)) | |
2880 | index++; | |
2881 | if (test_bit(PPC440SPE_ZERO_Q, &sw_desc->flags)) | |
2882 | index++; | |
2883 | ||
2884 | iter = ppc440spe_get_group_entry(sw_desc, index); | |
2885 | if (addr) { | |
2886 | /* one destination */ | |
2887 | list_for_each_entry_from(iter, | |
2888 | &sw_desc->group_list, chain_node) | |
2889 | ppc440spe_desc_set_dest_addr(iter, chan, | |
2890 | DMA_CUED_XOR_BASE, addr, 0); | |
2891 | } else { | |
2892 | /* two destinations */ | |
2893 | list_for_each_entry_from(iter, | |
2894 | &sw_desc->group_list, chain_node) { | |
2895 | ppc440spe_desc_set_dest_addr(iter, chan, | |
2896 | DMA_CUED_XOR_BASE, paddr, 0); | |
2897 | ppc440spe_desc_set_dest_addr(iter, chan, | |
2898 | DMA_CUED_XOR_BASE, qaddr, 1); | |
2899 | } | |
2900 | } | |
2901 | ||
2902 | if (index) { | |
2903 | /* To clear destinations update the descriptor | |
2904 | * (1st,2nd, or both depending on flags) | |
2905 | */ | |
2906 | index = 0; | |
2907 | if (test_bit(PPC440SPE_ZERO_P, | |
2908 | &sw_desc->flags)) { | |
2909 | iter = ppc440spe_get_group_entry( | |
2910 | sw_desc, index++); | |
2911 | ppc440spe_adma_pq_zero_op(iter, chan, | |
2912 | paddr); | |
2913 | } | |
2914 | ||
2915 | if (test_bit(PPC440SPE_ZERO_Q, | |
2916 | &sw_desc->flags)) { | |
2917 | iter = ppc440spe_get_group_entry( | |
2918 | sw_desc, index++); | |
2919 | ppc440spe_adma_pq_zero_op(iter, chan, | |
2920 | qaddr); | |
2921 | } | |
2922 | ||
2923 | return; | |
2924 | } | |
2925 | } else { | |
2926 | /* This is RXOR-only or RXOR/WXOR mixed chain */ | |
2927 | ||
2928 | /* If we want to include destination into calculations, | |
2929 | * then make dest addresses cued with mult=1 (XOR). | |
2930 | */ | |
2931 | ppath = test_bit(PPC440SPE_ZERO_P, &sw_desc->flags) ? | |
2932 | DMA_CUED_XOR_HB : | |
2933 | DMA_CUED_XOR_BASE | | |
2934 | (1 << DMA_CUED_MULT1_OFF); | |
2935 | qpath = test_bit(PPC440SPE_ZERO_Q, &sw_desc->flags) ? | |
2936 | DMA_CUED_XOR_HB : | |
2937 | DMA_CUED_XOR_BASE | | |
2938 | (1 << DMA_CUED_MULT1_OFF); | |
2939 | ||
2940 | /* Setup destination(s) in RXOR slot(s) */ | |
2941 | iter = ppc440spe_get_group_entry(sw_desc, index++); | |
2942 | ppc440spe_desc_set_dest_addr(iter, chan, | |
2943 | paddr ? ppath : qpath, | |
2944 | paddr ? paddr : qaddr, 0); | |
2945 | if (!addr) { | |
2946 | /* two destinations */ | |
2947 | iter = ppc440spe_get_group_entry(sw_desc, | |
2948 | index++); | |
2949 | ppc440spe_desc_set_dest_addr(iter, chan, | |
2950 | qpath, qaddr, 0); | |
2951 | } | |
2952 | ||
2953 | if (test_bit(PPC440SPE_DESC_WXOR, &sw_desc->flags)) { | |
2954 | /* Setup destination(s) in remaining WXOR | |
2955 | * slots | |
2956 | */ | |
2957 | iter = ppc440spe_get_group_entry(sw_desc, | |
2958 | index); | |
2959 | if (addr) { | |
2960 | /* one destination */ | |
2961 | list_for_each_entry_from(iter, | |
2962 | &sw_desc->group_list, | |
2963 | chain_node) | |
2964 | ppc440spe_desc_set_dest_addr( | |
2965 | iter, chan, | |
2966 | DMA_CUED_XOR_BASE, | |
2967 | addr, 0); | |
2968 | ||
2969 | } else { | |
2970 | /* two destinations */ | |
2971 | list_for_each_entry_from(iter, | |
2972 | &sw_desc->group_list, | |
2973 | chain_node) { | |
2974 | ppc440spe_desc_set_dest_addr( | |
2975 | iter, chan, | |
2976 | DMA_CUED_XOR_BASE, | |
2977 | paddr, 0); | |
2978 | ppc440spe_desc_set_dest_addr( | |
2979 | iter, chan, | |
2980 | DMA_CUED_XOR_BASE, | |
2981 | qaddr, 1); | |
2982 | } | |
2983 | } | |
2984 | } | |
2985 | ||
2986 | } | |
2987 | break; | |
2988 | ||
2989 | case PPC440SPE_XOR_ID: | |
2990 | /* DMA2 descriptors have only 1 destination, so there are | |
2991 | * two chains - one for each dest. | |
2992 | * If we want to include destination into calculations, | |
2993 | * then make dest addresses cued with mult=1 (XOR). | |
2994 | */ | |
2995 | ppath = test_bit(PPC440SPE_ZERO_P, &sw_desc->flags) ? | |
2996 | DMA_CUED_XOR_HB : | |
2997 | DMA_CUED_XOR_BASE | | |
2998 | (1 << DMA_CUED_MULT1_OFF); | |
2999 | ||
3000 | qpath = test_bit(PPC440SPE_ZERO_Q, &sw_desc->flags) ? | |
3001 | DMA_CUED_XOR_HB : | |
3002 | DMA_CUED_XOR_BASE | | |
3003 | (1 << DMA_CUED_MULT1_OFF); | |
3004 | ||
3005 | iter = ppc440spe_get_group_entry(sw_desc, 0); | |
3006 | for (i = 0; i < sw_desc->descs_per_op; i++) { | |
3007 | ppc440spe_desc_set_dest_addr(iter, chan, | |
3008 | paddr ? ppath : qpath, | |
3009 | paddr ? paddr : qaddr, 0); | |
3010 | iter = list_entry(iter->chain_node.next, | |
3011 | struct ppc440spe_adma_desc_slot, | |
3012 | chain_node); | |
3013 | } | |
3014 | ||
3015 | if (!addr) { | |
3016 | /* Two destinations; setup Q here */ | |
3017 | iter = ppc440spe_get_group_entry(sw_desc, | |
3018 | sw_desc->descs_per_op); | |
3019 | for (i = 0; i < sw_desc->descs_per_op; i++) { | |
3020 | ppc440spe_desc_set_dest_addr(iter, | |
3021 | chan, qpath, qaddr, 0); | |
3022 | iter = list_entry(iter->chain_node.next, | |
3023 | struct ppc440spe_adma_desc_slot, | |
3024 | chain_node); | |
3025 | } | |
3026 | } | |
3027 | ||
3028 | break; | |
3029 | } | |
3030 | } | |
3031 | ||
3032 | /** | |
3033 | * ppc440spe_adma_pq_zero_sum_set_dest - set destination address into descriptor | |
3034 | * for the PQ_ZERO_SUM operation | |
3035 | */ | |
3036 | static void ppc440spe_adma_pqzero_sum_set_dest( | |
3037 | struct ppc440spe_adma_desc_slot *sw_desc, | |
3038 | dma_addr_t paddr, dma_addr_t qaddr) | |
3039 | { | |
3040 | struct ppc440spe_adma_desc_slot *iter, *end; | |
3041 | struct ppc440spe_adma_chan *chan; | |
3042 | dma_addr_t addr = 0; | |
3043 | int idx; | |
3044 | ||
3045 | chan = to_ppc440spe_adma_chan(sw_desc->async_tx.chan); | |
3046 | ||
3047 | /* walk through the WXOR source list and set P/Q-destinations | |
3048 | * for each slot | |
3049 | */ | |
3050 | idx = (paddr && qaddr) ? 2 : 1; | |
3051 | /* set end */ | |
3052 | list_for_each_entry_reverse(end, &sw_desc->group_list, | |
3053 | chain_node) { | |
3054 | if (!(--idx)) | |
3055 | break; | |
3056 | } | |
3057 | /* set start */ | |
3058 | idx = (paddr && qaddr) ? 2 : 1; | |
3059 | iter = ppc440spe_get_group_entry(sw_desc, idx); | |
3060 | ||
3061 | if (paddr && qaddr) { | |
3062 | /* two destinations */ | |
3063 | list_for_each_entry_from(iter, &sw_desc->group_list, | |
3064 | chain_node) { | |
3065 | if (unlikely(iter == end)) | |
3066 | break; | |
3067 | ppc440spe_desc_set_dest_addr(iter, chan, | |
3068 | DMA_CUED_XOR_BASE, paddr, 0); | |
3069 | ppc440spe_desc_set_dest_addr(iter, chan, | |
3070 | DMA_CUED_XOR_BASE, qaddr, 1); | |
3071 | } | |
3072 | } else { | |
3073 | /* one destination */ | |
3074 | addr = paddr ? paddr : qaddr; | |
3075 | list_for_each_entry_from(iter, &sw_desc->group_list, | |
3076 | chain_node) { | |
3077 | if (unlikely(iter == end)) | |
3078 | break; | |
3079 | ppc440spe_desc_set_dest_addr(iter, chan, | |
3080 | DMA_CUED_XOR_BASE, addr, 0); | |
3081 | } | |
3082 | } | |
3083 | ||
3084 | /* The remaining descriptors are DATACHECK. These have no need in | |
3085 | * destination. Actually, these destinations are used there | |
3086 | * as sources for check operation. So, set addr as source. | |
3087 | */ | |
3088 | ppc440spe_desc_set_src_addr(end, chan, 0, 0, addr ? addr : paddr); | |
3089 | ||
3090 | if (!addr) { | |
3091 | end = list_entry(end->chain_node.next, | |
3092 | struct ppc440spe_adma_desc_slot, chain_node); | |
3093 | ppc440spe_desc_set_src_addr(end, chan, 0, 0, qaddr); | |
3094 | } | |
3095 | } | |
3096 | ||
3097 | /** | |
3098 | * ppc440spe_desc_set_xor_src_cnt - set source count into descriptor | |
3099 | */ | |
3100 | static inline void ppc440spe_desc_set_xor_src_cnt( | |
3101 | struct ppc440spe_adma_desc_slot *desc, | |
3102 | int src_cnt) | |
3103 | { | |
3104 | struct xor_cb *hw_desc = desc->hw_desc; | |
3105 | ||
3106 | hw_desc->cbc &= ~XOR_CDCR_OAC_MSK; | |
3107 | hw_desc->cbc |= src_cnt; | |
3108 | } | |
3109 | ||
3110 | /** | |
3111 | * ppc440spe_adma_pq_set_src - set source address into descriptor | |
3112 | */ | |
3113 | static void ppc440spe_adma_pq_set_src(struct ppc440spe_adma_desc_slot *sw_desc, | |
3114 | dma_addr_t addr, int index) | |
3115 | { | |
3116 | struct ppc440spe_adma_chan *chan; | |
3117 | dma_addr_t haddr = 0; | |
3118 | struct ppc440spe_adma_desc_slot *iter = NULL; | |
3119 | ||
3120 | chan = to_ppc440spe_adma_chan(sw_desc->async_tx.chan); | |
3121 | ||
3122 | switch (chan->device->id) { | |
3123 | case PPC440SPE_DMA0_ID: | |
3124 | case PPC440SPE_DMA1_ID: | |
3125 | /* DMA0,1 may do: WXOR, RXOR, RXOR+WXORs chain | |
3126 | */ | |
3127 | if (test_bit(PPC440SPE_DESC_RXOR, &sw_desc->flags)) { | |
3128 | /* RXOR-only or RXOR/WXOR operation */ | |
3129 | int iskip = test_bit(PPC440SPE_DESC_RXOR12, | |
3130 | &sw_desc->flags) ? 2 : 3; | |
3131 | ||
3132 | if (index == 0) { | |
3133 | /* 1st slot (RXOR) */ | |
3134 | /* setup sources region (R1-2-3, R1-2-4, | |
3135 | * or R1-2-5) | |
3136 | */ | |
3137 | if (test_bit(PPC440SPE_DESC_RXOR12, | |
3138 | &sw_desc->flags)) | |
3139 | haddr = DMA_RXOR12 << | |
3140 | DMA_CUED_REGION_OFF; | |
3141 | else if (test_bit(PPC440SPE_DESC_RXOR123, | |
3142 | &sw_desc->flags)) | |
3143 | haddr = DMA_RXOR123 << | |
3144 | DMA_CUED_REGION_OFF; | |
3145 | else if (test_bit(PPC440SPE_DESC_RXOR124, | |
3146 | &sw_desc->flags)) | |
3147 | haddr = DMA_RXOR124 << | |
3148 | DMA_CUED_REGION_OFF; | |
3149 | else if (test_bit(PPC440SPE_DESC_RXOR125, | |
3150 | &sw_desc->flags)) | |
3151 | haddr = DMA_RXOR125 << | |
3152 | DMA_CUED_REGION_OFF; | |
3153 | else | |
3154 | BUG(); | |
3155 | haddr |= DMA_CUED_XOR_BASE; | |
3156 | iter = ppc440spe_get_group_entry(sw_desc, 0); | |
3157 | } else if (index < iskip) { | |
3158 | /* 1st slot (RXOR) | |
3159 | * shall actually set source address only once | |
3160 | * instead of first <iskip> | |
3161 | */ | |
3162 | iter = NULL; | |
3163 | } else { | |
3164 | /* 2nd/3d and next slots (WXOR); | |
3165 | * skip first slot with RXOR | |
3166 | */ | |
3167 | haddr = DMA_CUED_XOR_HB; | |
3168 | iter = ppc440spe_get_group_entry(sw_desc, | |
3169 | index - iskip + sw_desc->dst_cnt); | |
3170 | } | |
3171 | } else { | |
3172 | int znum = 0; | |
3173 | ||
3174 | /* WXOR-only operation; skip first slots with | |
3175 | * zeroing destinations | |
3176 | */ | |
3177 | if (test_bit(PPC440SPE_ZERO_P, &sw_desc->flags)) | |
3178 | znum++; | |
3179 | if (test_bit(PPC440SPE_ZERO_Q, &sw_desc->flags)) | |
3180 | znum++; | |
3181 | ||
3182 | haddr = DMA_CUED_XOR_HB; | |
3183 | iter = ppc440spe_get_group_entry(sw_desc, | |
3184 | index + znum); | |
3185 | } | |
3186 | ||
3187 | if (likely(iter)) { | |
3188 | ppc440spe_desc_set_src_addr(iter, chan, 0, haddr, addr); | |
3189 | ||
3190 | if (!index && | |
3191 | test_bit(PPC440SPE_DESC_RXOR, &sw_desc->flags) && | |
3192 | sw_desc->dst_cnt == 2) { | |
3193 | /* if we have two destinations for RXOR, then | |
3194 | * setup source in the second descr too | |
3195 | */ | |
3196 | iter = ppc440spe_get_group_entry(sw_desc, 1); | |
3197 | ppc440spe_desc_set_src_addr(iter, chan, 0, | |
3198 | haddr, addr); | |
3199 | } | |
3200 | } | |
3201 | break; | |
3202 | ||
3203 | case PPC440SPE_XOR_ID: | |
3204 | /* DMA2 may do Biskup */ | |
3205 | iter = sw_desc->group_head; | |
3206 | if (iter->dst_cnt == 2) { | |
3207 | /* both P & Q calculations required; set P src here */ | |
3208 | ppc440spe_adma_dma2rxor_set_src(iter, index, addr); | |
3209 | ||
3210 | /* this is for Q */ | |
3211 | iter = ppc440spe_get_group_entry(sw_desc, | |
3212 | sw_desc->descs_per_op); | |
3213 | } | |
3214 | ppc440spe_adma_dma2rxor_set_src(iter, index, addr); | |
3215 | break; | |
3216 | } | |
3217 | } | |
3218 | ||
3219 | /** | |
3220 | * ppc440spe_adma_memcpy_xor_set_src - set source address into descriptor | |
3221 | */ | |
3222 | static void ppc440spe_adma_memcpy_xor_set_src( | |
3223 | struct ppc440spe_adma_desc_slot *sw_desc, | |
3224 | dma_addr_t addr, int index) | |
3225 | { | |
3226 | struct ppc440spe_adma_chan *chan; | |
3227 | ||
3228 | chan = to_ppc440spe_adma_chan(sw_desc->async_tx.chan); | |
3229 | sw_desc = sw_desc->group_head; | |
3230 | ||
3231 | if (likely(sw_desc)) | |
3232 | ppc440spe_desc_set_src_addr(sw_desc, chan, index, 0, addr); | |
3233 | } | |
3234 | ||
3235 | /** | |
3236 | * ppc440spe_adma_dma2rxor_inc_addr - | |
3237 | */ | |
3238 | static void ppc440spe_adma_dma2rxor_inc_addr( | |
3239 | struct ppc440spe_adma_desc_slot *desc, | |
3240 | struct ppc440spe_rxor *cursor, int index, int src_cnt) | |
3241 | { | |
3242 | cursor->addr_count++; | |
3243 | if (index == src_cnt - 1) { | |
3244 | ppc440spe_desc_set_xor_src_cnt(desc, cursor->addr_count); | |
3245 | } else if (cursor->addr_count == XOR_MAX_OPS) { | |
3246 | ppc440spe_desc_set_xor_src_cnt(desc, cursor->addr_count); | |
3247 | cursor->addr_count = 0; | |
3248 | cursor->desc_count++; | |
3249 | } | |
3250 | } | |
3251 | ||
3252 | /** | |
3253 | * ppc440spe_adma_dma2rxor_prep_src - setup RXOR types in DMA2 CDB | |
3254 | */ | |
3255 | static int ppc440spe_adma_dma2rxor_prep_src( | |
3256 | struct ppc440spe_adma_desc_slot *hdesc, | |
3257 | struct ppc440spe_rxor *cursor, int index, | |
3258 | int src_cnt, u32 addr) | |
3259 | { | |
3260 | int rval = 0; | |
3261 | u32 sign; | |
3262 | struct ppc440spe_adma_desc_slot *desc = hdesc; | |
3263 | int i; | |
3264 | ||
3265 | for (i = 0; i < cursor->desc_count; i++) { | |
3266 | desc = list_entry(hdesc->chain_node.next, | |
3267 | struct ppc440spe_adma_desc_slot, | |
3268 | chain_node); | |
3269 | } | |
3270 | ||
3271 | switch (cursor->state) { | |
3272 | case 0: | |
3273 | if (addr == cursor->addrl + cursor->len) { | |
3274 | /* direct RXOR */ | |
3275 | cursor->state = 1; | |
3276 | cursor->xor_count++; | |
3277 | if (index == src_cnt-1) { | |
3278 | ppc440spe_rxor_set_region(desc, | |
3279 | cursor->addr_count, | |
3280 | DMA_RXOR12 << DMA_CUED_REGION_OFF); | |
3281 | ppc440spe_adma_dma2rxor_inc_addr( | |
3282 | desc, cursor, index, src_cnt); | |
3283 | } | |
3284 | } else if (cursor->addrl == addr + cursor->len) { | |
3285 | /* reverse RXOR */ | |
3286 | cursor->state = 1; | |
3287 | cursor->xor_count++; | |
3288 | set_bit(cursor->addr_count, &desc->reverse_flags[0]); | |
3289 | if (index == src_cnt-1) { | |
3290 | ppc440spe_rxor_set_region(desc, | |
3291 | cursor->addr_count, | |
3292 | DMA_RXOR12 << DMA_CUED_REGION_OFF); | |
3293 | ppc440spe_adma_dma2rxor_inc_addr( | |
3294 | desc, cursor, index, src_cnt); | |
3295 | } | |
3296 | } else { | |
3297 | printk(KERN_ERR "Cannot build " | |
3298 | "DMA2 RXOR command block.\n"); | |
3299 | BUG(); | |
3300 | } | |
3301 | break; | |
3302 | case 1: | |
3303 | sign = test_bit(cursor->addr_count, | |
3304 | desc->reverse_flags) | |
3305 | ? -1 : 1; | |
3306 | if (index == src_cnt-2 || (sign == -1 | |
3307 | && addr != cursor->addrl - 2*cursor->len)) { | |
3308 | cursor->state = 0; | |
3309 | cursor->xor_count = 1; | |
3310 | cursor->addrl = addr; | |
3311 | ppc440spe_rxor_set_region(desc, | |
3312 | cursor->addr_count, | |
3313 | DMA_RXOR12 << DMA_CUED_REGION_OFF); | |
3314 | ppc440spe_adma_dma2rxor_inc_addr( | |
3315 | desc, cursor, index, src_cnt); | |
3316 | } else if (addr == cursor->addrl + 2*sign*cursor->len) { | |
3317 | cursor->state = 2; | |
3318 | cursor->xor_count = 0; | |
3319 | ppc440spe_rxor_set_region(desc, | |
3320 | cursor->addr_count, | |
3321 | DMA_RXOR123 << DMA_CUED_REGION_OFF); | |
3322 | if (index == src_cnt-1) { | |
3323 | ppc440spe_adma_dma2rxor_inc_addr( | |
3324 | desc, cursor, index, src_cnt); | |
3325 | } | |
3326 | } else if (addr == cursor->addrl + 3*cursor->len) { | |
3327 | cursor->state = 2; | |
3328 | cursor->xor_count = 0; | |
3329 | ppc440spe_rxor_set_region(desc, | |
3330 | cursor->addr_count, | |
3331 | DMA_RXOR124 << DMA_CUED_REGION_OFF); | |
3332 | if (index == src_cnt-1) { | |
3333 | ppc440spe_adma_dma2rxor_inc_addr( | |
3334 | desc, cursor, index, src_cnt); | |
3335 | } | |
3336 | } else if (addr == cursor->addrl + 4*cursor->len) { | |
3337 | cursor->state = 2; | |
3338 | cursor->xor_count = 0; | |
3339 | ppc440spe_rxor_set_region(desc, | |
3340 | cursor->addr_count, | |
3341 | DMA_RXOR125 << DMA_CUED_REGION_OFF); | |
3342 | if (index == src_cnt-1) { | |
3343 | ppc440spe_adma_dma2rxor_inc_addr( | |
3344 | desc, cursor, index, src_cnt); | |
3345 | } | |
3346 | } else { | |
3347 | cursor->state = 0; | |
3348 | cursor->xor_count = 1; | |
3349 | cursor->addrl = addr; | |
3350 | ppc440spe_rxor_set_region(desc, | |
3351 | cursor->addr_count, | |
3352 | DMA_RXOR12 << DMA_CUED_REGION_OFF); | |
3353 | ppc440spe_adma_dma2rxor_inc_addr( | |
3354 | desc, cursor, index, src_cnt); | |
3355 | } | |
3356 | break; | |
3357 | case 2: | |
3358 | cursor->state = 0; | |
3359 | cursor->addrl = addr; | |
3360 | cursor->xor_count++; | |
3361 | if (index) { | |
3362 | ppc440spe_adma_dma2rxor_inc_addr( | |
3363 | desc, cursor, index, src_cnt); | |
3364 | } | |
3365 | break; | |
3366 | } | |
3367 | ||
3368 | return rval; | |
3369 | } | |
3370 | ||
3371 | /** | |
3372 | * ppc440spe_adma_dma2rxor_set_src - set RXOR source address; it's assumed that | |
3373 | * ppc440spe_adma_dma2rxor_prep_src() has already done prior this call | |
3374 | */ | |
3375 | static void ppc440spe_adma_dma2rxor_set_src( | |
3376 | struct ppc440spe_adma_desc_slot *desc, | |
3377 | int index, dma_addr_t addr) | |
3378 | { | |
3379 | struct xor_cb *xcb = desc->hw_desc; | |
3380 | int k = 0, op = 0, lop = 0; | |
3381 | ||
3382 | /* get the RXOR operand which corresponds to index addr */ | |
3383 | while (op <= index) { | |
3384 | lop = op; | |
3385 | if (k == XOR_MAX_OPS) { | |
3386 | k = 0; | |
3387 | desc = list_entry(desc->chain_node.next, | |
3388 | struct ppc440spe_adma_desc_slot, chain_node); | |
3389 | xcb = desc->hw_desc; | |
3390 | ||
3391 | } | |
3392 | if ((xcb->ops[k++].h & (DMA_RXOR12 << DMA_CUED_REGION_OFF)) == | |
3393 | (DMA_RXOR12 << DMA_CUED_REGION_OFF)) | |
3394 | op += 2; | |
3395 | else | |
3396 | op += 3; | |
3397 | } | |
3398 | ||
3399 | BUG_ON(k < 1); | |
3400 | ||
3401 | if (test_bit(k-1, desc->reverse_flags)) { | |
3402 | /* reverse operand order; put last op in RXOR group */ | |
3403 | if (index == op - 1) | |
3404 | ppc440spe_rxor_set_src(desc, k - 1, addr); | |
3405 | } else { | |
3406 | /* direct operand order; put first op in RXOR group */ | |
3407 | if (index == lop) | |
3408 | ppc440spe_rxor_set_src(desc, k - 1, addr); | |
3409 | } | |
3410 | } | |
3411 | ||
3412 | /** | |
3413 | * ppc440spe_adma_dma2rxor_set_mult - set RXOR multipliers; it's assumed that | |
3414 | * ppc440spe_adma_dma2rxor_prep_src() has already done prior this call | |
3415 | */ | |
3416 | static void ppc440spe_adma_dma2rxor_set_mult( | |
3417 | struct ppc440spe_adma_desc_slot *desc, | |
3418 | int index, u8 mult) | |
3419 | { | |
3420 | struct xor_cb *xcb = desc->hw_desc; | |
3421 | int k = 0, op = 0, lop = 0; | |
3422 | ||
3423 | /* get the RXOR operand which corresponds to index mult */ | |
3424 | while (op <= index) { | |
3425 | lop = op; | |
3426 | if (k == XOR_MAX_OPS) { | |
3427 | k = 0; | |
3428 | desc = list_entry(desc->chain_node.next, | |
3429 | struct ppc440spe_adma_desc_slot, | |
3430 | chain_node); | |
3431 | xcb = desc->hw_desc; | |
3432 | ||
3433 | } | |
3434 | if ((xcb->ops[k++].h & (DMA_RXOR12 << DMA_CUED_REGION_OFF)) == | |
3435 | (DMA_RXOR12 << DMA_CUED_REGION_OFF)) | |
3436 | op += 2; | |
3437 | else | |
3438 | op += 3; | |
3439 | } | |
3440 | ||
3441 | BUG_ON(k < 1); | |
3442 | if (test_bit(k-1, desc->reverse_flags)) { | |
3443 | /* reverse order */ | |
3444 | ppc440spe_rxor_set_mult(desc, k - 1, op - index - 1, mult); | |
3445 | } else { | |
3446 | /* direct order */ | |
3447 | ppc440spe_rxor_set_mult(desc, k - 1, index - lop, mult); | |
3448 | } | |
3449 | } | |
3450 | ||
3451 | /** | |
3452 | * ppc440spe_init_rxor_cursor - | |
3453 | */ | |
3454 | static void ppc440spe_init_rxor_cursor(struct ppc440spe_rxor *cursor) | |
3455 | { | |
3456 | memset(cursor, 0, sizeof(struct ppc440spe_rxor)); | |
3457 | cursor->state = 2; | |
3458 | } | |
3459 | ||
3460 | /** | |
3461 | * ppc440spe_adma_pq_set_src_mult - set multiplication coefficient into | |
3462 | * descriptor for the PQXOR operation | |
3463 | */ | |
3464 | static void ppc440spe_adma_pq_set_src_mult( | |
3465 | struct ppc440spe_adma_desc_slot *sw_desc, | |
3466 | unsigned char mult, int index, int dst_pos) | |
3467 | { | |
3468 | struct ppc440spe_adma_chan *chan; | |
3469 | u32 mult_idx, mult_dst; | |
3470 | struct ppc440spe_adma_desc_slot *iter = NULL, *iter1 = NULL; | |
3471 | ||
3472 | chan = to_ppc440spe_adma_chan(sw_desc->async_tx.chan); | |
3473 | ||
3474 | switch (chan->device->id) { | |
3475 | case PPC440SPE_DMA0_ID: | |
3476 | case PPC440SPE_DMA1_ID: | |
3477 | if (test_bit(PPC440SPE_DESC_RXOR, &sw_desc->flags)) { | |
3478 | int region = test_bit(PPC440SPE_DESC_RXOR12, | |
3479 | &sw_desc->flags) ? 2 : 3; | |
3480 | ||
3481 | if (index < region) { | |
3482 | /* RXOR multipliers */ | |
3483 | iter = ppc440spe_get_group_entry(sw_desc, | |
3484 | sw_desc->dst_cnt - 1); | |
3485 | if (sw_desc->dst_cnt == 2) | |
3486 | iter1 = ppc440spe_get_group_entry( | |
3487 | sw_desc, 0); | |
3488 | ||
3489 | mult_idx = DMA_CUED_MULT1_OFF + (index << 3); | |
3490 | mult_dst = DMA_CDB_SG_SRC; | |
3491 | } else { | |
3492 | /* WXOR multiplier */ | |
3493 | iter = ppc440spe_get_group_entry(sw_desc, | |
3494 | index - region + | |
3495 | sw_desc->dst_cnt); | |
3496 | mult_idx = DMA_CUED_MULT1_OFF; | |
3497 | mult_dst = dst_pos ? DMA_CDB_SG_DST2 : | |
3498 | DMA_CDB_SG_DST1; | |
3499 | } | |
3500 | } else { | |
3501 | int znum = 0; | |
3502 | ||
3503 | /* WXOR-only; | |
3504 | * skip first slots with destinations (if ZERO_DST has | |
3505 | * place) | |
3506 | */ | |
3507 | if (test_bit(PPC440SPE_ZERO_P, &sw_desc->flags)) | |
3508 | znum++; | |
3509 | if (test_bit(PPC440SPE_ZERO_Q, &sw_desc->flags)) | |
3510 | znum++; | |
3511 | ||
3512 | iter = ppc440spe_get_group_entry(sw_desc, index + znum); | |
3513 | mult_idx = DMA_CUED_MULT1_OFF; | |
3514 | mult_dst = dst_pos ? DMA_CDB_SG_DST2 : DMA_CDB_SG_DST1; | |
3515 | } | |
3516 | ||
3517 | if (likely(iter)) { | |
3518 | ppc440spe_desc_set_src_mult(iter, chan, | |
3519 | mult_idx, mult_dst, mult); | |
3520 | ||
3521 | if (unlikely(iter1)) { | |
3522 | /* if we have two destinations for RXOR, then | |
3523 | * we've just set Q mult. Set-up P now. | |
3524 | */ | |
3525 | ppc440spe_desc_set_src_mult(iter1, chan, | |
3526 | mult_idx, mult_dst, 1); | |
3527 | } | |
3528 | ||
3529 | } | |
3530 | break; | |
3531 | ||
3532 | case PPC440SPE_XOR_ID: | |
3533 | iter = sw_desc->group_head; | |
3534 | if (sw_desc->dst_cnt == 2) { | |
3535 | /* both P & Q calculations required; set P mult here */ | |
3536 | ppc440spe_adma_dma2rxor_set_mult(iter, index, 1); | |
3537 | ||
3538 | /* and then set Q mult */ | |
3539 | iter = ppc440spe_get_group_entry(sw_desc, | |
3540 | sw_desc->descs_per_op); | |
3541 | } | |
3542 | ppc440spe_adma_dma2rxor_set_mult(iter, index, mult); | |
3543 | break; | |
3544 | } | |
3545 | } | |
3546 | ||
3547 | /** | |
3548 | * ppc440spe_adma_free_chan_resources - free the resources allocated | |
3549 | */ | |
3550 | static void ppc440spe_adma_free_chan_resources(struct dma_chan *chan) | |
3551 | { | |
3552 | struct ppc440spe_adma_chan *ppc440spe_chan; | |
3553 | struct ppc440spe_adma_desc_slot *iter, *_iter; | |
3554 | int in_use_descs = 0; | |
3555 | ||
3556 | ppc440spe_chan = to_ppc440spe_adma_chan(chan); | |
3557 | ppc440spe_adma_slot_cleanup(ppc440spe_chan); | |
3558 | ||
3559 | spin_lock_bh(&ppc440spe_chan->lock); | |
3560 | list_for_each_entry_safe(iter, _iter, &ppc440spe_chan->chain, | |
3561 | chain_node) { | |
3562 | in_use_descs++; | |
3563 | list_del(&iter->chain_node); | |
3564 | } | |
3565 | list_for_each_entry_safe_reverse(iter, _iter, | |
3566 | &ppc440spe_chan->all_slots, slot_node) { | |
3567 | list_del(&iter->slot_node); | |
3568 | kfree(iter); | |
3569 | ppc440spe_chan->slots_allocated--; | |
3570 | } | |
3571 | ppc440spe_chan->last_used = NULL; | |
3572 | ||
3573 | dev_dbg(ppc440spe_chan->device->common.dev, | |
3574 | "ppc440spe adma%d %s slots_allocated %d\n", | |
3575 | ppc440spe_chan->device->id, | |
3576 | __func__, ppc440spe_chan->slots_allocated); | |
3577 | spin_unlock_bh(&ppc440spe_chan->lock); | |
3578 | ||
3579 | /* one is ok since we left it on there on purpose */ | |
3580 | if (in_use_descs > 1) | |
3581 | printk(KERN_ERR "SPE: Freeing %d in use descriptors!\n", | |
3582 | in_use_descs - 1); | |
3583 | } | |
3584 | ||
3585 | /** | |
07934481 | 3586 | * ppc440spe_adma_tx_status - poll the status of an ADMA transaction |
12458ea0 AG |
3587 | * @chan: ADMA channel handle |
3588 | * @cookie: ADMA transaction identifier | |
07934481 | 3589 | * @txstate: a holder for the current state of the channel |
12458ea0 | 3590 | */ |
07934481 LW |
3591 | static enum dma_status ppc440spe_adma_tx_status(struct dma_chan *chan, |
3592 | dma_cookie_t cookie, struct dma_tx_state *txstate) | |
12458ea0 AG |
3593 | { |
3594 | struct ppc440spe_adma_chan *ppc440spe_chan; | |
12458ea0 AG |
3595 | enum dma_status ret; |
3596 | ||
3597 | ppc440spe_chan = to_ppc440spe_adma_chan(chan); | |
96a2af41 | 3598 | ret = dma_cookie_status(chan, cookie, txstate); |
5738992b | 3599 | if (ret == DMA_COMPLETE) |
12458ea0 AG |
3600 | return ret; |
3601 | ||
3602 | ppc440spe_adma_slot_cleanup(ppc440spe_chan); | |
3603 | ||
96a2af41 | 3604 | return dma_cookie_status(chan, cookie, txstate); |
12458ea0 AG |
3605 | } |
3606 | ||
3607 | /** | |
3608 | * ppc440spe_adma_eot_handler - end of transfer interrupt handler | |
3609 | */ | |
3610 | static irqreturn_t ppc440spe_adma_eot_handler(int irq, void *data) | |
3611 | { | |
3612 | struct ppc440spe_adma_chan *chan = data; | |
3613 | ||
3614 | dev_dbg(chan->device->common.dev, | |
3615 | "ppc440spe adma%d: %s\n", chan->device->id, __func__); | |
3616 | ||
3617 | tasklet_schedule(&chan->irq_tasklet); | |
3618 | ppc440spe_adma_device_clear_eot_status(chan); | |
3619 | ||
3620 | return IRQ_HANDLED; | |
3621 | } | |
3622 | ||
3623 | /** | |
3624 | * ppc440spe_adma_err_handler - DMA error interrupt handler; | |
3625 | * do the same things as a eot handler | |
3626 | */ | |
3627 | static irqreturn_t ppc440spe_adma_err_handler(int irq, void *data) | |
3628 | { | |
3629 | struct ppc440spe_adma_chan *chan = data; | |
3630 | ||
3631 | dev_dbg(chan->device->common.dev, | |
3632 | "ppc440spe adma%d: %s\n", chan->device->id, __func__); | |
3633 | ||
3634 | tasklet_schedule(&chan->irq_tasklet); | |
3635 | ppc440spe_adma_device_clear_eot_status(chan); | |
3636 | ||
3637 | return IRQ_HANDLED; | |
3638 | } | |
3639 | ||
3640 | /** | |
3641 | * ppc440spe_test_callback - called when test operation has been done | |
3642 | */ | |
3643 | static void ppc440spe_test_callback(void *unused) | |
3644 | { | |
3645 | complete(&ppc440spe_r6_test_comp); | |
3646 | } | |
3647 | ||
3648 | /** | |
3649 | * ppc440spe_adma_issue_pending - flush all pending descriptors to h/w | |
3650 | */ | |
3651 | static void ppc440spe_adma_issue_pending(struct dma_chan *chan) | |
3652 | { | |
3653 | struct ppc440spe_adma_chan *ppc440spe_chan; | |
3654 | ||
3655 | ppc440spe_chan = to_ppc440spe_adma_chan(chan); | |
3656 | dev_dbg(ppc440spe_chan->device->common.dev, | |
3657 | "ppc440spe adma%d: %s %d \n", ppc440spe_chan->device->id, | |
3658 | __func__, ppc440spe_chan->pending); | |
3659 | ||
3660 | if (ppc440spe_chan->pending) { | |
3661 | ppc440spe_chan->pending = 0; | |
3662 | ppc440spe_chan_append(ppc440spe_chan); | |
3663 | } | |
3664 | } | |
3665 | ||
3666 | /** | |
3667 | * ppc440spe_chan_start_null_xor - initiate the first XOR operation (DMA engines | |
3668 | * use FIFOs (as opposite to chains used in XOR) so this is a XOR | |
3669 | * specific operation) | |
3670 | */ | |
3671 | static void ppc440spe_chan_start_null_xor(struct ppc440spe_adma_chan *chan) | |
3672 | { | |
3673 | struct ppc440spe_adma_desc_slot *sw_desc, *group_start; | |
3674 | dma_cookie_t cookie; | |
3675 | int slot_cnt, slots_per_op; | |
3676 | ||
3677 | dev_dbg(chan->device->common.dev, | |
3678 | "ppc440spe adma%d: %s\n", chan->device->id, __func__); | |
3679 | ||
3680 | spin_lock_bh(&chan->lock); | |
3681 | slot_cnt = ppc440spe_chan_xor_slot_count(0, 2, &slots_per_op); | |
3682 | sw_desc = ppc440spe_adma_alloc_slots(chan, slot_cnt, slots_per_op); | |
3683 | if (sw_desc) { | |
3684 | group_start = sw_desc->group_head; | |
3685 | list_splice_init(&sw_desc->group_list, &chan->chain); | |
3686 | async_tx_ack(&sw_desc->async_tx); | |
3687 | ppc440spe_desc_init_null_xor(group_start); | |
3688 | ||
2a926e46 | 3689 | cookie = dma_cookie_assign(&sw_desc->async_tx); |
12458ea0 AG |
3690 | |
3691 | /* initialize the completed cookie to be less than | |
3692 | * the most recently used cookie | |
3693 | */ | |
4d4e58de | 3694 | chan->common.completed_cookie = cookie - 1; |
12458ea0 AG |
3695 | |
3696 | /* channel should not be busy */ | |
3697 | BUG_ON(ppc440spe_chan_is_busy(chan)); | |
3698 | ||
3699 | /* set the descriptor address */ | |
3700 | ppc440spe_chan_set_first_xor_descriptor(chan, sw_desc); | |
3701 | ||
3702 | /* run the descriptor */ | |
3703 | ppc440spe_chan_run(chan); | |
3704 | } else | |
3705 | printk(KERN_ERR "ppc440spe adma%d" | |
3706 | " failed to allocate null descriptor\n", | |
3707 | chan->device->id); | |
3708 | spin_unlock_bh(&chan->lock); | |
3709 | } | |
3710 | ||
3711 | /** | |
3712 | * ppc440spe_test_raid6 - test are RAID-6 capabilities enabled successfully. | |
3713 | * For this we just perform one WXOR operation with the same source | |
3714 | * and destination addresses, the GF-multiplier is 1; so if RAID-6 | |
3715 | * capabilities are enabled then we'll get src/dst filled with zero. | |
3716 | */ | |
3717 | static int ppc440spe_test_raid6(struct ppc440spe_adma_chan *chan) | |
3718 | { | |
3719 | struct ppc440spe_adma_desc_slot *sw_desc, *iter; | |
3720 | struct page *pg; | |
3721 | char *a; | |
3722 | dma_addr_t dma_addr, addrs[2]; | |
3723 | unsigned long op = 0; | |
3724 | int rval = 0; | |
3725 | ||
3726 | set_bit(PPC440SPE_DESC_WXOR, &op); | |
3727 | ||
3728 | pg = alloc_page(GFP_KERNEL); | |
3729 | if (!pg) | |
3730 | return -ENOMEM; | |
3731 | ||
3732 | spin_lock_bh(&chan->lock); | |
3733 | sw_desc = ppc440spe_adma_alloc_slots(chan, 1, 1); | |
3734 | if (sw_desc) { | |
3735 | /* 1 src, 1 dsr, int_ena, WXOR */ | |
3736 | ppc440spe_desc_init_dma01pq(sw_desc, 1, 1, 1, op); | |
3737 | list_for_each_entry(iter, &sw_desc->group_list, chain_node) { | |
3738 | ppc440spe_desc_set_byte_count(iter, chan, PAGE_SIZE); | |
3739 | iter->unmap_len = PAGE_SIZE; | |
3740 | } | |
3741 | } else { | |
3742 | rval = -EFAULT; | |
3743 | spin_unlock_bh(&chan->lock); | |
3744 | goto exit; | |
3745 | } | |
3746 | spin_unlock_bh(&chan->lock); | |
3747 | ||
3748 | /* Fill the test page with ones */ | |
3749 | memset(page_address(pg), 0xFF, PAGE_SIZE); | |
3750 | dma_addr = dma_map_page(chan->device->dev, pg, 0, | |
3751 | PAGE_SIZE, DMA_BIDIRECTIONAL); | |
3752 | ||
3753 | /* Setup addresses */ | |
3754 | ppc440spe_adma_pq_set_src(sw_desc, dma_addr, 0); | |
3755 | ppc440spe_adma_pq_set_src_mult(sw_desc, 1, 0, 0); | |
3756 | addrs[0] = dma_addr; | |
3757 | addrs[1] = 0; | |
3758 | ppc440spe_adma_pq_set_dest(sw_desc, addrs, DMA_PREP_PQ_DISABLE_Q); | |
3759 | ||
3760 | async_tx_ack(&sw_desc->async_tx); | |
3761 | sw_desc->async_tx.callback = ppc440spe_test_callback; | |
3762 | sw_desc->async_tx.callback_param = NULL; | |
3763 | ||
3764 | init_completion(&ppc440spe_r6_test_comp); | |
3765 | ||
3766 | ppc440spe_adma_tx_submit(&sw_desc->async_tx); | |
3767 | ppc440spe_adma_issue_pending(&chan->common); | |
3768 | ||
3769 | wait_for_completion(&ppc440spe_r6_test_comp); | |
3770 | ||
3771 | /* Now check if the test page is zeroed */ | |
3772 | a = page_address(pg); | |
3773 | if ((*(u32 *)a) == 0 && memcmp(a, a+4, PAGE_SIZE-4) == 0) { | |
3774 | /* page is zero - RAID-6 enabled */ | |
3775 | rval = 0; | |
3776 | } else { | |
3777 | /* RAID-6 was not enabled */ | |
3778 | rval = -EINVAL; | |
3779 | } | |
3780 | exit: | |
3781 | __free_page(pg); | |
3782 | return rval; | |
3783 | } | |
3784 | ||
3785 | static void ppc440spe_adma_init_capabilities(struct ppc440spe_adma_device *adev) | |
3786 | { | |
3787 | switch (adev->id) { | |
3788 | case PPC440SPE_DMA0_ID: | |
3789 | case PPC440SPE_DMA1_ID: | |
3790 | dma_cap_set(DMA_MEMCPY, adev->common.cap_mask); | |
3791 | dma_cap_set(DMA_INTERRUPT, adev->common.cap_mask); | |
12458ea0 AG |
3792 | dma_cap_set(DMA_PQ, adev->common.cap_mask); |
3793 | dma_cap_set(DMA_PQ_VAL, adev->common.cap_mask); | |
3794 | dma_cap_set(DMA_XOR_VAL, adev->common.cap_mask); | |
3795 | break; | |
3796 | case PPC440SPE_XOR_ID: | |
3797 | dma_cap_set(DMA_XOR, adev->common.cap_mask); | |
3798 | dma_cap_set(DMA_PQ, adev->common.cap_mask); | |
3799 | dma_cap_set(DMA_INTERRUPT, adev->common.cap_mask); | |
3800 | adev->common.cap_mask = adev->common.cap_mask; | |
3801 | break; | |
3802 | } | |
3803 | ||
3804 | /* Set base routines */ | |
3805 | adev->common.device_alloc_chan_resources = | |
3806 | ppc440spe_adma_alloc_chan_resources; | |
3807 | adev->common.device_free_chan_resources = | |
3808 | ppc440spe_adma_free_chan_resources; | |
07934481 | 3809 | adev->common.device_tx_status = ppc440spe_adma_tx_status; |
12458ea0 AG |
3810 | adev->common.device_issue_pending = ppc440spe_adma_issue_pending; |
3811 | ||
3812 | /* Set prep routines based on capability */ | |
3813 | if (dma_has_cap(DMA_MEMCPY, adev->common.cap_mask)) { | |
3814 | adev->common.device_prep_dma_memcpy = | |
3815 | ppc440spe_adma_prep_dma_memcpy; | |
3816 | } | |
12458ea0 AG |
3817 | if (dma_has_cap(DMA_XOR, adev->common.cap_mask)) { |
3818 | adev->common.max_xor = XOR_MAX_OPS; | |
3819 | adev->common.device_prep_dma_xor = | |
3820 | ppc440spe_adma_prep_dma_xor; | |
3821 | } | |
3822 | if (dma_has_cap(DMA_PQ, adev->common.cap_mask)) { | |
3823 | switch (adev->id) { | |
3824 | case PPC440SPE_DMA0_ID: | |
3825 | dma_set_maxpq(&adev->common, | |
3826 | DMA0_FIFO_SIZE / sizeof(struct dma_cdb), 0); | |
3827 | break; | |
3828 | case PPC440SPE_DMA1_ID: | |
3829 | dma_set_maxpq(&adev->common, | |
3830 | DMA1_FIFO_SIZE / sizeof(struct dma_cdb), 0); | |
3831 | break; | |
3832 | case PPC440SPE_XOR_ID: | |
3833 | adev->common.max_pq = XOR_MAX_OPS * 3; | |
3834 | break; | |
3835 | } | |
3836 | adev->common.device_prep_dma_pq = | |
3837 | ppc440spe_adma_prep_dma_pq; | |
3838 | } | |
3839 | if (dma_has_cap(DMA_PQ_VAL, adev->common.cap_mask)) { | |
3840 | switch (adev->id) { | |
3841 | case PPC440SPE_DMA0_ID: | |
3842 | adev->common.max_pq = DMA0_FIFO_SIZE / | |
3843 | sizeof(struct dma_cdb); | |
3844 | break; | |
3845 | case PPC440SPE_DMA1_ID: | |
3846 | adev->common.max_pq = DMA1_FIFO_SIZE / | |
3847 | sizeof(struct dma_cdb); | |
3848 | break; | |
3849 | } | |
3850 | adev->common.device_prep_dma_pq_val = | |
3851 | ppc440spe_adma_prep_dma_pqzero_sum; | |
3852 | } | |
3853 | if (dma_has_cap(DMA_XOR_VAL, adev->common.cap_mask)) { | |
3854 | switch (adev->id) { | |
3855 | case PPC440SPE_DMA0_ID: | |
3856 | adev->common.max_xor = DMA0_FIFO_SIZE / | |
3857 | sizeof(struct dma_cdb); | |
3858 | break; | |
3859 | case PPC440SPE_DMA1_ID: | |
3860 | adev->common.max_xor = DMA1_FIFO_SIZE / | |
3861 | sizeof(struct dma_cdb); | |
3862 | break; | |
3863 | } | |
3864 | adev->common.device_prep_dma_xor_val = | |
3865 | ppc440spe_adma_prep_dma_xor_zero_sum; | |
3866 | } | |
3867 | if (dma_has_cap(DMA_INTERRUPT, adev->common.cap_mask)) { | |
3868 | adev->common.device_prep_dma_interrupt = | |
3869 | ppc440spe_adma_prep_dma_interrupt; | |
3870 | } | |
3871 | pr_info("%s: AMCC(R) PPC440SP(E) ADMA Engine: " | |
6aa2731c | 3872 | "( %s%s%s%s%s%s)\n", |
12458ea0 AG |
3873 | dev_name(adev->dev), |
3874 | dma_has_cap(DMA_PQ, adev->common.cap_mask) ? "pq " : "", | |
3875 | dma_has_cap(DMA_PQ_VAL, adev->common.cap_mask) ? "pq_val " : "", | |
3876 | dma_has_cap(DMA_XOR, adev->common.cap_mask) ? "xor " : "", | |
3877 | dma_has_cap(DMA_XOR_VAL, adev->common.cap_mask) ? "xor_val " : "", | |
3878 | dma_has_cap(DMA_MEMCPY, adev->common.cap_mask) ? "memcpy " : "", | |
12458ea0 AG |
3879 | dma_has_cap(DMA_INTERRUPT, adev->common.cap_mask) ? "intr " : ""); |
3880 | } | |
3881 | ||
3882 | static int ppc440spe_adma_setup_irqs(struct ppc440spe_adma_device *adev, | |
3883 | struct ppc440spe_adma_chan *chan, | |
3884 | int *initcode) | |
3885 | { | |
2dc11581 | 3886 | struct platform_device *ofdev; |
12458ea0 AG |
3887 | struct device_node *np; |
3888 | int ret; | |
3889 | ||
2dc11581 | 3890 | ofdev = container_of(adev->dev, struct platform_device, dev); |
3e6b02d9 | 3891 | np = ofdev->dev.of_node; |
12458ea0 AG |
3892 | if (adev->id != PPC440SPE_XOR_ID) { |
3893 | adev->err_irq = irq_of_parse_and_map(np, 1); | |
3894 | if (adev->err_irq == NO_IRQ) { | |
3895 | dev_warn(adev->dev, "no err irq resource?\n"); | |
3896 | *initcode = PPC_ADMA_INIT_IRQ2; | |
3897 | adev->err_irq = -ENXIO; | |
3898 | } else | |
3899 | atomic_inc(&ppc440spe_adma_err_irq_ref); | |
3900 | } else { | |
3901 | adev->err_irq = -ENXIO; | |
3902 | } | |
3903 | ||
3904 | adev->irq = irq_of_parse_and_map(np, 0); | |
3905 | if (adev->irq == NO_IRQ) { | |
3906 | dev_err(adev->dev, "no irq resource\n"); | |
3907 | *initcode = PPC_ADMA_INIT_IRQ1; | |
3908 | ret = -ENXIO; | |
3909 | goto err_irq_map; | |
3910 | } | |
3911 | dev_dbg(adev->dev, "irq %d, err irq %d\n", | |
3912 | adev->irq, adev->err_irq); | |
3913 | ||
3914 | ret = request_irq(adev->irq, ppc440spe_adma_eot_handler, | |
3915 | 0, dev_driver_string(adev->dev), chan); | |
3916 | if (ret) { | |
3917 | dev_err(adev->dev, "can't request irq %d\n", | |
3918 | adev->irq); | |
3919 | *initcode = PPC_ADMA_INIT_IRQ1; | |
3920 | ret = -EIO; | |
3921 | goto err_req1; | |
3922 | } | |
3923 | ||
3924 | /* only DMA engines have a separate error IRQ | |
3925 | * so it's Ok if err_irq < 0 in XOR engine case. | |
3926 | */ | |
3927 | if (adev->err_irq > 0) { | |
3928 | /* both DMA engines share common error IRQ */ | |
3929 | ret = request_irq(adev->err_irq, | |
3930 | ppc440spe_adma_err_handler, | |
3931 | IRQF_SHARED, | |
3932 | dev_driver_string(adev->dev), | |
3933 | chan); | |
3934 | if (ret) { | |
3935 | dev_err(adev->dev, "can't request irq %d\n", | |
3936 | adev->err_irq); | |
3937 | *initcode = PPC_ADMA_INIT_IRQ2; | |
3938 | ret = -EIO; | |
3939 | goto err_req2; | |
3940 | } | |
3941 | } | |
3942 | ||
3943 | if (adev->id == PPC440SPE_XOR_ID) { | |
3944 | /* enable XOR engine interrupts */ | |
3945 | iowrite32be(XOR_IE_CBCIE_BIT | XOR_IE_ICBIE_BIT | | |
3946 | XOR_IE_ICIE_BIT | XOR_IE_RPTIE_BIT, | |
3947 | &adev->xor_reg->ier); | |
3948 | } else { | |
3949 | u32 mask, enable; | |
3950 | ||
3951 | np = of_find_compatible_node(NULL, NULL, "ibm,i2o-440spe"); | |
3952 | if (!np) { | |
3953 | pr_err("%s: can't find I2O device tree node\n", | |
3954 | __func__); | |
3955 | ret = -ENODEV; | |
3956 | goto err_req2; | |
3957 | } | |
3958 | adev->i2o_reg = of_iomap(np, 0); | |
3959 | if (!adev->i2o_reg) { | |
3960 | pr_err("%s: failed to map I2O registers\n", __func__); | |
3961 | of_node_put(np); | |
3962 | ret = -EINVAL; | |
3963 | goto err_req2; | |
3964 | } | |
3965 | of_node_put(np); | |
3966 | /* Unmask 'CS FIFO Attention' interrupts and | |
3967 | * enable generating interrupts on errors | |
3968 | */ | |
3969 | enable = (adev->id == PPC440SPE_DMA0_ID) ? | |
3970 | ~(I2O_IOPIM_P0SNE | I2O_IOPIM_P0EM) : | |
3971 | ~(I2O_IOPIM_P1SNE | I2O_IOPIM_P1EM); | |
3972 | mask = ioread32(&adev->i2o_reg->iopim) & enable; | |
3973 | iowrite32(mask, &adev->i2o_reg->iopim); | |
3974 | } | |
3975 | return 0; | |
3976 | ||
3977 | err_req2: | |
3978 | free_irq(adev->irq, chan); | |
3979 | err_req1: | |
3980 | irq_dispose_mapping(adev->irq); | |
3981 | err_irq_map: | |
3982 | if (adev->err_irq > 0) { | |
3983 | if (atomic_dec_and_test(&ppc440spe_adma_err_irq_ref)) | |
3984 | irq_dispose_mapping(adev->err_irq); | |
3985 | } | |
3986 | return ret; | |
3987 | } | |
3988 | ||
3989 | static void ppc440spe_adma_release_irqs(struct ppc440spe_adma_device *adev, | |
3990 | struct ppc440spe_adma_chan *chan) | |
3991 | { | |
3992 | u32 mask, disable; | |
3993 | ||
3994 | if (adev->id == PPC440SPE_XOR_ID) { | |
3995 | /* disable XOR engine interrupts */ | |
3996 | mask = ioread32be(&adev->xor_reg->ier); | |
3997 | mask &= ~(XOR_IE_CBCIE_BIT | XOR_IE_ICBIE_BIT | | |
3998 | XOR_IE_ICIE_BIT | XOR_IE_RPTIE_BIT); | |
3999 | iowrite32be(mask, &adev->xor_reg->ier); | |
4000 | } else { | |
4001 | /* disable DMAx engine interrupts */ | |
4002 | disable = (adev->id == PPC440SPE_DMA0_ID) ? | |
4003 | (I2O_IOPIM_P0SNE | I2O_IOPIM_P0EM) : | |
4004 | (I2O_IOPIM_P1SNE | I2O_IOPIM_P1EM); | |
4005 | mask = ioread32(&adev->i2o_reg->iopim) | disable; | |
4006 | iowrite32(mask, &adev->i2o_reg->iopim); | |
4007 | } | |
4008 | free_irq(adev->irq, chan); | |
4009 | irq_dispose_mapping(adev->irq); | |
4010 | if (adev->err_irq > 0) { | |
4011 | free_irq(adev->err_irq, chan); | |
4012 | if (atomic_dec_and_test(&ppc440spe_adma_err_irq_ref)) { | |
4013 | irq_dispose_mapping(adev->err_irq); | |
4014 | iounmap(adev->i2o_reg); | |
4015 | } | |
4016 | } | |
4017 | } | |
4018 | ||
4019 | /** | |
4020 | * ppc440spe_adma_probe - probe the asynch device | |
4021 | */ | |
463a1f8b | 4022 | static int ppc440spe_adma_probe(struct platform_device *ofdev) |
12458ea0 | 4023 | { |
05c02542 | 4024 | struct device_node *np = ofdev->dev.of_node; |
12458ea0 AG |
4025 | struct resource res; |
4026 | struct ppc440spe_adma_device *adev; | |
4027 | struct ppc440spe_adma_chan *chan; | |
4028 | struct ppc_dma_chan_ref *ref, *_ref; | |
4029 | int ret = 0, initcode = PPC_ADMA_INIT_OK; | |
4030 | const u32 *idx; | |
4031 | int len; | |
4032 | void *regs; | |
4033 | u32 id, pool_size; | |
4034 | ||
4035 | if (of_device_is_compatible(np, "amcc,xor-accelerator")) { | |
4036 | id = PPC440SPE_XOR_ID; | |
4037 | /* As far as the XOR engine is concerned, it does not | |
4038 | * use FIFOs but uses linked list. So there is no dependency | |
4039 | * between pool size to allocate and the engine configuration. | |
4040 | */ | |
4041 | pool_size = PAGE_SIZE << 1; | |
4042 | } else { | |
4043 | /* it is DMA0 or DMA1 */ | |
4044 | idx = of_get_property(np, "cell-index", &len); | |
4045 | if (!idx || (len != sizeof(u32))) { | |
4046 | dev_err(&ofdev->dev, "Device node %s has missing " | |
4047 | "or invalid cell-index property\n", | |
4048 | np->full_name); | |
4049 | return -EINVAL; | |
4050 | } | |
4051 | id = *idx; | |
4052 | /* DMA0,1 engines use FIFO to maintain CDBs, so we | |
4053 | * should allocate the pool accordingly to size of this | |
4054 | * FIFO. Thus, the pool size depends on the FIFO depth: | |
4055 | * how much CDBs pointers the FIFO may contain then so | |
4056 | * much CDBs we should provide in the pool. | |
4057 | * That is | |
4058 | * CDB size = 32B; | |
4059 | * CDBs number = (DMA0_FIFO_SIZE >> 3); | |
4060 | * Pool size = CDBs number * CDB size = | |
4061 | * = (DMA0_FIFO_SIZE >> 3) << 5 = DMA0_FIFO_SIZE << 2. | |
4062 | */ | |
4063 | pool_size = (id == PPC440SPE_DMA0_ID) ? | |
4064 | DMA0_FIFO_SIZE : DMA1_FIFO_SIZE; | |
4065 | pool_size <<= 2; | |
4066 | } | |
4067 | ||
4068 | if (of_address_to_resource(np, 0, &res)) { | |
4069 | dev_err(&ofdev->dev, "failed to get memory resource\n"); | |
4070 | initcode = PPC_ADMA_INIT_MEMRES; | |
4071 | ret = -ENODEV; | |
4072 | goto out; | |
4073 | } | |
4074 | ||
4075 | if (!request_mem_region(res.start, resource_size(&res), | |
4076 | dev_driver_string(&ofdev->dev))) { | |
a584bff5 JP |
4077 | dev_err(&ofdev->dev, "failed to request memory region %pR\n", |
4078 | &res); | |
12458ea0 AG |
4079 | initcode = PPC_ADMA_INIT_MEMREG; |
4080 | ret = -EBUSY; | |
4081 | goto out; | |
4082 | } | |
4083 | ||
4084 | /* create a device */ | |
4085 | adev = kzalloc(sizeof(*adev), GFP_KERNEL); | |
4086 | if (!adev) { | |
4087 | dev_err(&ofdev->dev, "failed to allocate device\n"); | |
4088 | initcode = PPC_ADMA_INIT_ALLOC; | |
4089 | ret = -ENOMEM; | |
4090 | goto err_adev_alloc; | |
4091 | } | |
4092 | ||
4093 | adev->id = id; | |
4094 | adev->pool_size = pool_size; | |
4095 | /* allocate coherent memory for hardware descriptors */ | |
4096 | adev->dma_desc_pool_virt = dma_alloc_coherent(&ofdev->dev, | |
4097 | adev->pool_size, &adev->dma_desc_pool, | |
4098 | GFP_KERNEL); | |
4099 | if (adev->dma_desc_pool_virt == NULL) { | |
4100 | dev_err(&ofdev->dev, "failed to allocate %d bytes of coherent " | |
4101 | "memory for hardware descriptors\n", | |
4102 | adev->pool_size); | |
4103 | initcode = PPC_ADMA_INIT_COHERENT; | |
4104 | ret = -ENOMEM; | |
4105 | goto err_dma_alloc; | |
4106 | } | |
d73111c6 | 4107 | dev_dbg(&ofdev->dev, "allocated descriptor pool virt 0x%p phys 0x%llx\n", |
12458ea0 AG |
4108 | adev->dma_desc_pool_virt, (u64)adev->dma_desc_pool); |
4109 | ||
4110 | regs = ioremap(res.start, resource_size(&res)); | |
4111 | if (!regs) { | |
4112 | dev_err(&ofdev->dev, "failed to ioremap regs!\n"); | |
f3b77727 | 4113 | ret = -ENOMEM; |
12458ea0 AG |
4114 | goto err_regs_alloc; |
4115 | } | |
4116 | ||
4117 | if (adev->id == PPC440SPE_XOR_ID) { | |
4118 | adev->xor_reg = regs; | |
4119 | /* Reset XOR */ | |
4120 | iowrite32be(XOR_CRSR_XASR_BIT, &adev->xor_reg->crsr); | |
4121 | iowrite32be(XOR_CRSR_64BA_BIT, &adev->xor_reg->crrr); | |
4122 | } else { | |
4123 | size_t fifo_size = (adev->id == PPC440SPE_DMA0_ID) ? | |
4124 | DMA0_FIFO_SIZE : DMA1_FIFO_SIZE; | |
4125 | adev->dma_reg = regs; | |
4126 | /* DMAx_FIFO_SIZE is defined in bytes, | |
4127 | * <fsiz> - is defined in number of CDB pointers (8byte). | |
4128 | * DMA FIFO Length = CSlength + CPlength, where | |
4129 | * CSlength = CPlength = (fsiz + 1) * 8. | |
4130 | */ | |
4131 | iowrite32(DMA_FIFO_ENABLE | ((fifo_size >> 3) - 2), | |
4132 | &adev->dma_reg->fsiz); | |
4133 | /* Configure DMA engine */ | |
4134 | iowrite32(DMA_CFG_DXEPR_HP | DMA_CFG_DFMPP_HP | DMA_CFG_FALGN, | |
4135 | &adev->dma_reg->cfg); | |
4136 | /* Clear Status */ | |
4137 | iowrite32(~0, &adev->dma_reg->dsts); | |
4138 | } | |
4139 | ||
4140 | adev->dev = &ofdev->dev; | |
4141 | adev->common.dev = &ofdev->dev; | |
4142 | INIT_LIST_HEAD(&adev->common.channels); | |
dd3daca1 | 4143 | platform_set_drvdata(ofdev, adev); |
12458ea0 AG |
4144 | |
4145 | /* create a channel */ | |
4146 | chan = kzalloc(sizeof(*chan), GFP_KERNEL); | |
4147 | if (!chan) { | |
4148 | dev_err(&ofdev->dev, "can't allocate channel structure\n"); | |
4149 | initcode = PPC_ADMA_INIT_CHANNEL; | |
4150 | ret = -ENOMEM; | |
4151 | goto err_chan_alloc; | |
4152 | } | |
4153 | ||
4154 | spin_lock_init(&chan->lock); | |
4155 | INIT_LIST_HEAD(&chan->chain); | |
4156 | INIT_LIST_HEAD(&chan->all_slots); | |
4157 | chan->device = adev; | |
4158 | chan->common.device = &adev->common; | |
8ac69546 | 4159 | dma_cookie_init(&chan->common); |
12458ea0 AG |
4160 | list_add_tail(&chan->common.device_node, &adev->common.channels); |
4161 | tasklet_init(&chan->irq_tasklet, ppc440spe_adma_tasklet, | |
4162 | (unsigned long)chan); | |
4163 | ||
4164 | /* allocate and map helper pages for async validation or | |
4165 | * async_mult/async_sum_product operations on DMA0/1. | |
4166 | */ | |
4167 | if (adev->id != PPC440SPE_XOR_ID) { | |
4168 | chan->pdest_page = alloc_page(GFP_KERNEL); | |
4169 | chan->qdest_page = alloc_page(GFP_KERNEL); | |
4170 | if (!chan->pdest_page || | |
4171 | !chan->qdest_page) { | |
4172 | if (chan->pdest_page) | |
4173 | __free_page(chan->pdest_page); | |
4174 | if (chan->qdest_page) | |
4175 | __free_page(chan->qdest_page); | |
4176 | ret = -ENOMEM; | |
4177 | goto err_page_alloc; | |
4178 | } | |
4179 | chan->pdest = dma_map_page(&ofdev->dev, chan->pdest_page, 0, | |
4180 | PAGE_SIZE, DMA_BIDIRECTIONAL); | |
4181 | chan->qdest = dma_map_page(&ofdev->dev, chan->qdest_page, 0, | |
4182 | PAGE_SIZE, DMA_BIDIRECTIONAL); | |
4183 | } | |
4184 | ||
4185 | ref = kmalloc(sizeof(*ref), GFP_KERNEL); | |
4186 | if (ref) { | |
4187 | ref->chan = &chan->common; | |
4188 | INIT_LIST_HEAD(&ref->node); | |
4189 | list_add_tail(&ref->node, &ppc440spe_adma_chan_list); | |
4190 | } else { | |
4191 | dev_err(&ofdev->dev, "failed to allocate channel reference!\n"); | |
4192 | ret = -ENOMEM; | |
4193 | goto err_ref_alloc; | |
4194 | } | |
4195 | ||
4196 | ret = ppc440spe_adma_setup_irqs(adev, chan, &initcode); | |
4197 | if (ret) | |
4198 | goto err_irq; | |
4199 | ||
4200 | ppc440spe_adma_init_capabilities(adev); | |
4201 | ||
4202 | ret = dma_async_device_register(&adev->common); | |
4203 | if (ret) { | |
4204 | initcode = PPC_ADMA_INIT_REGISTER; | |
4205 | dev_err(&ofdev->dev, "failed to register dma device\n"); | |
4206 | goto err_dev_reg; | |
4207 | } | |
4208 | ||
4209 | goto out; | |
4210 | ||
4211 | err_dev_reg: | |
4212 | ppc440spe_adma_release_irqs(adev, chan); | |
4213 | err_irq: | |
4214 | list_for_each_entry_safe(ref, _ref, &ppc440spe_adma_chan_list, node) { | |
4215 | if (chan == to_ppc440spe_adma_chan(ref->chan)) { | |
4216 | list_del(&ref->node); | |
4217 | kfree(ref); | |
4218 | } | |
4219 | } | |
4220 | err_ref_alloc: | |
4221 | if (adev->id != PPC440SPE_XOR_ID) { | |
4222 | dma_unmap_page(&ofdev->dev, chan->pdest, | |
4223 | PAGE_SIZE, DMA_BIDIRECTIONAL); | |
4224 | dma_unmap_page(&ofdev->dev, chan->qdest, | |
4225 | PAGE_SIZE, DMA_BIDIRECTIONAL); | |
4226 | __free_page(chan->pdest_page); | |
4227 | __free_page(chan->qdest_page); | |
4228 | } | |
4229 | err_page_alloc: | |
4230 | kfree(chan); | |
4231 | err_chan_alloc: | |
4232 | if (adev->id == PPC440SPE_XOR_ID) | |
4233 | iounmap(adev->xor_reg); | |
4234 | else | |
4235 | iounmap(adev->dma_reg); | |
4236 | err_regs_alloc: | |
4237 | dma_free_coherent(adev->dev, adev->pool_size, | |
4238 | adev->dma_desc_pool_virt, | |
4239 | adev->dma_desc_pool); | |
4240 | err_dma_alloc: | |
4241 | kfree(adev); | |
4242 | err_adev_alloc: | |
4243 | release_mem_region(res.start, resource_size(&res)); | |
4244 | out: | |
4245 | if (id < PPC440SPE_ADMA_ENGINES_NUM) | |
4246 | ppc440spe_adma_devices[id] = initcode; | |
4247 | ||
4248 | return ret; | |
4249 | } | |
4250 | ||
4251 | /** | |
4252 | * ppc440spe_adma_remove - remove the asynch device | |
4253 | */ | |
4bf27b8b | 4254 | static int ppc440spe_adma_remove(struct platform_device *ofdev) |
12458ea0 | 4255 | { |
dd3daca1 | 4256 | struct ppc440spe_adma_device *adev = platform_get_drvdata(ofdev); |
05c02542 | 4257 | struct device_node *np = ofdev->dev.of_node; |
12458ea0 AG |
4258 | struct resource res; |
4259 | struct dma_chan *chan, *_chan; | |
4260 | struct ppc_dma_chan_ref *ref, *_ref; | |
4261 | struct ppc440spe_adma_chan *ppc440spe_chan; | |
4262 | ||
12458ea0 AG |
4263 | if (adev->id < PPC440SPE_ADMA_ENGINES_NUM) |
4264 | ppc440spe_adma_devices[adev->id] = -1; | |
4265 | ||
4266 | dma_async_device_unregister(&adev->common); | |
4267 | ||
4268 | list_for_each_entry_safe(chan, _chan, &adev->common.channels, | |
4269 | device_node) { | |
4270 | ppc440spe_chan = to_ppc440spe_adma_chan(chan); | |
4271 | ppc440spe_adma_release_irqs(adev, ppc440spe_chan); | |
4272 | tasklet_kill(&ppc440spe_chan->irq_tasklet); | |
4273 | if (adev->id != PPC440SPE_XOR_ID) { | |
4274 | dma_unmap_page(&ofdev->dev, ppc440spe_chan->pdest, | |
4275 | PAGE_SIZE, DMA_BIDIRECTIONAL); | |
4276 | dma_unmap_page(&ofdev->dev, ppc440spe_chan->qdest, | |
4277 | PAGE_SIZE, DMA_BIDIRECTIONAL); | |
4278 | __free_page(ppc440spe_chan->pdest_page); | |
4279 | __free_page(ppc440spe_chan->qdest_page); | |
4280 | } | |
4281 | list_for_each_entry_safe(ref, _ref, &ppc440spe_adma_chan_list, | |
4282 | node) { | |
4283 | if (ppc440spe_chan == | |
4284 | to_ppc440spe_adma_chan(ref->chan)) { | |
4285 | list_del(&ref->node); | |
4286 | kfree(ref); | |
4287 | } | |
4288 | } | |
4289 | list_del(&chan->device_node); | |
4290 | kfree(ppc440spe_chan); | |
4291 | } | |
4292 | ||
4293 | dma_free_coherent(adev->dev, adev->pool_size, | |
4294 | adev->dma_desc_pool_virt, adev->dma_desc_pool); | |
4295 | if (adev->id == PPC440SPE_XOR_ID) | |
4296 | iounmap(adev->xor_reg); | |
4297 | else | |
4298 | iounmap(adev->dma_reg); | |
4299 | of_address_to_resource(np, 0, &res); | |
4300 | release_mem_region(res.start, resource_size(&res)); | |
4301 | kfree(adev); | |
4302 | return 0; | |
4303 | } | |
4304 | ||
4305 | /* | |
4306 | * /sys driver interface to enable h/w RAID-6 capabilities | |
4307 | * Files created in e.g. /sys/devices/plb.0/400100100.dma0/driver/ | |
4308 | * directory are "devices", "enable" and "poly". | |
4309 | * "devices" shows available engines. | |
4310 | * "enable" is used to enable RAID-6 capabilities or to check | |
4311 | * whether these has been activated. | |
4312 | * "poly" allows setting/checking used polynomial (for PPC440SPe only). | |
4313 | */ | |
4314 | ||
4315 | static ssize_t show_ppc440spe_devices(struct device_driver *dev, char *buf) | |
4316 | { | |
4317 | ssize_t size = 0; | |
4318 | int i; | |
4319 | ||
4320 | for (i = 0; i < PPC440SPE_ADMA_ENGINES_NUM; i++) { | |
4321 | if (ppc440spe_adma_devices[i] == -1) | |
4322 | continue; | |
4323 | size += snprintf(buf + size, PAGE_SIZE - size, | |
4324 | "PPC440SP(E)-ADMA.%d: %s\n", i, | |
4325 | ppc_adma_errors[ppc440spe_adma_devices[i]]); | |
4326 | } | |
4327 | return size; | |
4328 | } | |
4329 | ||
4330 | static ssize_t show_ppc440spe_r6enable(struct device_driver *dev, char *buf) | |
4331 | { | |
4332 | return snprintf(buf, PAGE_SIZE, | |
4333 | "PPC440SP(e) RAID-6 capabilities are %sABLED.\n", | |
4334 | ppc440spe_r6_enabled ? "EN" : "DIS"); | |
4335 | } | |
4336 | ||
4337 | static ssize_t store_ppc440spe_r6enable(struct device_driver *dev, | |
4338 | const char *buf, size_t count) | |
4339 | { | |
4340 | unsigned long val; | |
4341 | ||
4342 | if (!count || count > 11) | |
4343 | return -EINVAL; | |
4344 | ||
4345 | if (!ppc440spe_r6_tchan) | |
4346 | return -EFAULT; | |
4347 | ||
4348 | /* Write a key */ | |
4349 | sscanf(buf, "%lx", &val); | |
4350 | dcr_write(ppc440spe_mq_dcr_host, DCRN_MQ0_XORBA, val); | |
4351 | isync(); | |
4352 | ||
4353 | /* Verify whether it really works now */ | |
4354 | if (ppc440spe_test_raid6(ppc440spe_r6_tchan) == 0) { | |
4355 | pr_info("PPC440SP(e) RAID-6 has been activated " | |
4356 | "successfully\n"); | |
4357 | ppc440spe_r6_enabled = 1; | |
4358 | } else { | |
4359 | pr_info("PPC440SP(e) RAID-6 hasn't been activated!" | |
4360 | " Error key ?\n"); | |
4361 | ppc440spe_r6_enabled = 0; | |
4362 | } | |
4363 | return count; | |
4364 | } | |
4365 | ||
4366 | static ssize_t show_ppc440spe_r6poly(struct device_driver *dev, char *buf) | |
4367 | { | |
4368 | ssize_t size = 0; | |
4369 | u32 reg; | |
4370 | ||
4371 | #ifdef CONFIG_440SP | |
4372 | /* 440SP has fixed polynomial */ | |
4373 | reg = 0x4d; | |
4374 | #else | |
4375 | reg = dcr_read(ppc440spe_mq_dcr_host, DCRN_MQ0_CFBHL); | |
4376 | reg >>= MQ0_CFBHL_POLY; | |
4377 | reg &= 0xFF; | |
4378 | #endif | |
4379 | ||
4380 | size = snprintf(buf, PAGE_SIZE, "PPC440SP(e) RAID-6 driver " | |
4381 | "uses 0x1%02x polynomial.\n", reg); | |
4382 | return size; | |
4383 | } | |
4384 | ||
4385 | static ssize_t store_ppc440spe_r6poly(struct device_driver *dev, | |
4386 | const char *buf, size_t count) | |
4387 | { | |
4388 | unsigned long reg, val; | |
4389 | ||
4390 | #ifdef CONFIG_440SP | |
4391 | /* 440SP uses default 0x14D polynomial only */ | |
4392 | return -EINVAL; | |
4393 | #endif | |
4394 | ||
4395 | if (!count || count > 6) | |
4396 | return -EINVAL; | |
4397 | ||
4398 | /* e.g., 0x14D or 0x11D */ | |
4399 | sscanf(buf, "%lx", &val); | |
4400 | ||
4401 | if (val & ~0x1FF) | |
4402 | return -EINVAL; | |
4403 | ||
4404 | val &= 0xFF; | |
4405 | reg = dcr_read(ppc440spe_mq_dcr_host, DCRN_MQ0_CFBHL); | |
4406 | reg &= ~(0xFF << MQ0_CFBHL_POLY); | |
4407 | reg |= val << MQ0_CFBHL_POLY; | |
4408 | dcr_write(ppc440spe_mq_dcr_host, DCRN_MQ0_CFBHL, reg); | |
4409 | ||
4410 | return count; | |
4411 | } | |
4412 | ||
4413 | static DRIVER_ATTR(devices, S_IRUGO, show_ppc440spe_devices, NULL); | |
4414 | static DRIVER_ATTR(enable, S_IRUGO | S_IWUSR, show_ppc440spe_r6enable, | |
4415 | store_ppc440spe_r6enable); | |
4416 | static DRIVER_ATTR(poly, S_IRUGO | S_IWUSR, show_ppc440spe_r6poly, | |
4417 | store_ppc440spe_r6poly); | |
4418 | ||
4419 | /* | |
4420 | * Common initialisation for RAID engines; allocate memory for | |
4421 | * DMAx FIFOs, perform configuration common for all DMA engines. | |
4422 | * Further DMA engine specific configuration is done at probe time. | |
4423 | */ | |
4424 | static int ppc440spe_configure_raid_devices(void) | |
4425 | { | |
4426 | struct device_node *np; | |
4427 | struct resource i2o_res; | |
4428 | struct i2o_regs __iomem *i2o_reg; | |
4429 | dcr_host_t i2o_dcr_host; | |
4430 | unsigned int dcr_base, dcr_len; | |
4431 | int i, ret; | |
4432 | ||
4433 | np = of_find_compatible_node(NULL, NULL, "ibm,i2o-440spe"); | |
4434 | if (!np) { | |
4435 | pr_err("%s: can't find I2O device tree node\n", | |
4436 | __func__); | |
4437 | return -ENODEV; | |
4438 | } | |
4439 | ||
4440 | if (of_address_to_resource(np, 0, &i2o_res)) { | |
4441 | of_node_put(np); | |
4442 | return -EINVAL; | |
4443 | } | |
4444 | ||
4445 | i2o_reg = of_iomap(np, 0); | |
4446 | if (!i2o_reg) { | |
4447 | pr_err("%s: failed to map I2O registers\n", __func__); | |
4448 | of_node_put(np); | |
4449 | return -EINVAL; | |
4450 | } | |
4451 | ||
4452 | /* Get I2O DCRs base */ | |
4453 | dcr_base = dcr_resource_start(np, 0); | |
4454 | dcr_len = dcr_resource_len(np, 0); | |
4455 | if (!dcr_base && !dcr_len) { | |
4456 | pr_err("%s: can't get DCR registers base/len!\n", | |
4457 | np->full_name); | |
4458 | of_node_put(np); | |
4459 | iounmap(i2o_reg); | |
4460 | return -ENODEV; | |
4461 | } | |
4462 | ||
4463 | i2o_dcr_host = dcr_map(np, dcr_base, dcr_len); | |
4464 | if (!DCR_MAP_OK(i2o_dcr_host)) { | |
4465 | pr_err("%s: failed to map DCRs!\n", np->full_name); | |
4466 | of_node_put(np); | |
4467 | iounmap(i2o_reg); | |
4468 | return -ENODEV; | |
4469 | } | |
4470 | of_node_put(np); | |
4471 | ||
4472 | /* Provide memory regions for DMA's FIFOs: I2O, DMA0 and DMA1 share | |
4473 | * the base address of FIFO memory space. | |
4474 | * Actually we need twice more physical memory than programmed in the | |
4475 | * <fsiz> register (because there are two FIFOs for each DMA: CP and CS) | |
4476 | */ | |
4477 | ppc440spe_dma_fifo_buf = kmalloc((DMA0_FIFO_SIZE + DMA1_FIFO_SIZE) << 1, | |
4478 | GFP_KERNEL); | |
4479 | if (!ppc440spe_dma_fifo_buf) { | |
4480 | pr_err("%s: DMA FIFO buffer allocation failed.\n", __func__); | |
4481 | iounmap(i2o_reg); | |
4482 | dcr_unmap(i2o_dcr_host, dcr_len); | |
4483 | return -ENOMEM; | |
4484 | } | |
4485 | ||
4486 | /* | |
4487 | * Configure h/w | |
4488 | */ | |
4489 | /* Reset I2O/DMA */ | |
4490 | mtdcri(SDR0, DCRN_SDR0_SRST, DCRN_SDR0_SRST_I2ODMA); | |
4491 | mtdcri(SDR0, DCRN_SDR0_SRST, 0); | |
4492 | ||
4493 | /* Setup the base address of mmaped registers */ | |
4494 | dcr_write(i2o_dcr_host, DCRN_I2O0_IBAH, (u32)(i2o_res.start >> 32)); | |
4495 | dcr_write(i2o_dcr_host, DCRN_I2O0_IBAL, (u32)(i2o_res.start) | | |
4496 | I2O_REG_ENABLE); | |
4497 | dcr_unmap(i2o_dcr_host, dcr_len); | |
4498 | ||
4499 | /* Setup FIFO memory space base address */ | |
4500 | iowrite32(0, &i2o_reg->ifbah); | |
4501 | iowrite32(((u32)__pa(ppc440spe_dma_fifo_buf)), &i2o_reg->ifbal); | |
4502 | ||
4503 | /* set zero FIFO size for I2O, so the whole | |
4504 | * ppc440spe_dma_fifo_buf is used by DMAs. | |
4505 | * DMAx_FIFOs will be configured while probe. | |
4506 | */ | |
4507 | iowrite32(0, &i2o_reg->ifsiz); | |
4508 | iounmap(i2o_reg); | |
4509 | ||
4510 | /* To prepare WXOR/RXOR functionality we need access to | |
4511 | * Memory Queue Module DCRs (finally it will be enabled | |
4512 | * via /sys interface of the ppc440spe ADMA driver). | |
4513 | */ | |
4514 | np = of_find_compatible_node(NULL, NULL, "ibm,mq-440spe"); | |
4515 | if (!np) { | |
4516 | pr_err("%s: can't find MQ device tree node\n", | |
4517 | __func__); | |
4518 | ret = -ENODEV; | |
4519 | goto out_free; | |
4520 | } | |
4521 | ||
4522 | /* Get MQ DCRs base */ | |
4523 | dcr_base = dcr_resource_start(np, 0); | |
4524 | dcr_len = dcr_resource_len(np, 0); | |
4525 | if (!dcr_base && !dcr_len) { | |
4526 | pr_err("%s: can't get DCR registers base/len!\n", | |
4527 | np->full_name); | |
4528 | ret = -ENODEV; | |
4529 | goto out_mq; | |
4530 | } | |
4531 | ||
4532 | ppc440spe_mq_dcr_host = dcr_map(np, dcr_base, dcr_len); | |
4533 | if (!DCR_MAP_OK(ppc440spe_mq_dcr_host)) { | |
4534 | pr_err("%s: failed to map DCRs!\n", np->full_name); | |
4535 | ret = -ENODEV; | |
4536 | goto out_mq; | |
4537 | } | |
4538 | of_node_put(np); | |
4539 | ppc440spe_mq_dcr_len = dcr_len; | |
4540 | ||
4541 | /* Set HB alias */ | |
4542 | dcr_write(ppc440spe_mq_dcr_host, DCRN_MQ0_BAUH, DMA_CUED_XOR_HB); | |
4543 | ||
4544 | /* Set: | |
4545 | * - LL transaction passing limit to 1; | |
4546 | * - Memory controller cycle limit to 1; | |
4547 | * - Galois Polynomial to 0x14d (default) | |
4548 | */ | |
4549 | dcr_write(ppc440spe_mq_dcr_host, DCRN_MQ0_CFBHL, | |
4550 | (1 << MQ0_CFBHL_TPLM) | (1 << MQ0_CFBHL_HBCL) | | |
4551 | (PPC440SPE_DEFAULT_POLY << MQ0_CFBHL_POLY)); | |
4552 | ||
4553 | atomic_set(&ppc440spe_adma_err_irq_ref, 0); | |
4554 | for (i = 0; i < PPC440SPE_ADMA_ENGINES_NUM; i++) | |
4555 | ppc440spe_adma_devices[i] = -1; | |
4556 | ||
4557 | return 0; | |
4558 | ||
4559 | out_mq: | |
4560 | of_node_put(np); | |
4561 | out_free: | |
4562 | kfree(ppc440spe_dma_fifo_buf); | |
4563 | return ret; | |
4564 | } | |
4565 | ||
4bf27b8b | 4566 | static const struct of_device_id ppc440spe_adma_of_match[] = { |
12458ea0 AG |
4567 | { .compatible = "ibm,dma-440spe", }, |
4568 | { .compatible = "amcc,xor-accelerator", }, | |
4569 | {}, | |
4570 | }; | |
4571 | MODULE_DEVICE_TABLE(of, ppc440spe_adma_of_match); | |
4572 | ||
00006124 | 4573 | static struct platform_driver ppc440spe_adma_driver = { |
12458ea0 | 4574 | .probe = ppc440spe_adma_probe, |
a7d6e3ec | 4575 | .remove = ppc440spe_adma_remove, |
12458ea0 AG |
4576 | .driver = { |
4577 | .name = "PPC440SP(E)-ADMA", | |
4018294b | 4578 | .of_match_table = ppc440spe_adma_of_match, |
12458ea0 AG |
4579 | }, |
4580 | }; | |
4581 | ||
4582 | static __init int ppc440spe_adma_init(void) | |
4583 | { | |
4584 | int ret; | |
4585 | ||
4586 | ret = ppc440spe_configure_raid_devices(); | |
4587 | if (ret) | |
4588 | return ret; | |
4589 | ||
00006124 | 4590 | ret = platform_driver_register(&ppc440spe_adma_driver); |
12458ea0 AG |
4591 | if (ret) { |
4592 | pr_err("%s: failed to register platform driver\n", | |
4593 | __func__); | |
4594 | goto out_reg; | |
4595 | } | |
4596 | ||
4597 | /* Initialization status */ | |
4598 | ret = driver_create_file(&ppc440spe_adma_driver.driver, | |
4599 | &driver_attr_devices); | |
4600 | if (ret) | |
4601 | goto out_dev; | |
4602 | ||
4603 | /* RAID-6 h/w enable entry */ | |
4604 | ret = driver_create_file(&ppc440spe_adma_driver.driver, | |
4605 | &driver_attr_enable); | |
4606 | if (ret) | |
4607 | goto out_en; | |
4608 | ||
4609 | /* GF polynomial to use */ | |
4610 | ret = driver_create_file(&ppc440spe_adma_driver.driver, | |
4611 | &driver_attr_poly); | |
4612 | if (!ret) | |
4613 | return ret; | |
4614 | ||
4615 | driver_remove_file(&ppc440spe_adma_driver.driver, | |
4616 | &driver_attr_enable); | |
4617 | out_en: | |
4618 | driver_remove_file(&ppc440spe_adma_driver.driver, | |
4619 | &driver_attr_devices); | |
4620 | out_dev: | |
4621 | /* User will not be able to enable h/w RAID-6 */ | |
4622 | pr_err("%s: failed to create RAID-6 driver interface\n", | |
4623 | __func__); | |
00006124 | 4624 | platform_driver_unregister(&ppc440spe_adma_driver); |
12458ea0 AG |
4625 | out_reg: |
4626 | dcr_unmap(ppc440spe_mq_dcr_host, ppc440spe_mq_dcr_len); | |
4627 | kfree(ppc440spe_dma_fifo_buf); | |
4628 | return ret; | |
4629 | } | |
4630 | ||
4631 | static void __exit ppc440spe_adma_exit(void) | |
4632 | { | |
4633 | driver_remove_file(&ppc440spe_adma_driver.driver, | |
4634 | &driver_attr_poly); | |
4635 | driver_remove_file(&ppc440spe_adma_driver.driver, | |
4636 | &driver_attr_enable); | |
4637 | driver_remove_file(&ppc440spe_adma_driver.driver, | |
4638 | &driver_attr_devices); | |
00006124 | 4639 | platform_driver_unregister(&ppc440spe_adma_driver); |
12458ea0 AG |
4640 | dcr_unmap(ppc440spe_mq_dcr_host, ppc440spe_mq_dcr_len); |
4641 | kfree(ppc440spe_dma_fifo_buf); | |
4642 | } | |
4643 | ||
4644 | arch_initcall(ppc440spe_adma_init); | |
4645 | module_exit(ppc440spe_adma_exit); | |
4646 | ||
4647 | MODULE_AUTHOR("Yuri Tikhonov <yur@emcraft.com>"); | |
4648 | MODULE_DESCRIPTION("PPC440SPE ADMA Engine Driver"); | |
4649 | MODULE_LICENSE("GPL"); |