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b7d861d9 BK |
1 | /* |
2 | * Copyright (c) 2012 Samsung Electronics Co., Ltd. | |
3 | * http://www.samsung.com | |
b3040e40 JB |
4 | * |
5 | * Copyright (C) 2010 Samsung Electronics Co. Ltd. | |
6 | * Jaswinder Singh <jassi.brar@samsung.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | */ | |
13 | ||
b7d861d9 | 14 | #include <linux/kernel.h> |
b3040e40 JB |
15 | #include <linux/io.h> |
16 | #include <linux/init.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/module.h> | |
b7d861d9 BK |
19 | #include <linux/string.h> |
20 | #include <linux/delay.h> | |
21 | #include <linux/interrupt.h> | |
22 | #include <linux/dma-mapping.h> | |
b3040e40 | 23 | #include <linux/dmaengine.h> |
b3040e40 JB |
24 | #include <linux/amba/bus.h> |
25 | #include <linux/amba/pl330.h> | |
1b9bb715 | 26 | #include <linux/scatterlist.h> |
93ed5544 | 27 | #include <linux/of.h> |
a80258f9 | 28 | #include <linux/of_dma.h> |
bcc7fa95 | 29 | #include <linux/err.h> |
b3040e40 | 30 | |
d2ebfb33 | 31 | #include "dmaengine.h" |
b7d861d9 BK |
32 | #define PL330_MAX_CHAN 8 |
33 | #define PL330_MAX_IRQS 32 | |
34 | #define PL330_MAX_PERI 32 | |
35 | ||
36 | enum pl330_srccachectrl { | |
37 | SCCTRL0, /* Noncacheable and nonbufferable */ | |
38 | SCCTRL1, /* Bufferable only */ | |
39 | SCCTRL2, /* Cacheable, but do not allocate */ | |
40 | SCCTRL3, /* Cacheable and bufferable, but do not allocate */ | |
41 | SINVALID1, | |
42 | SINVALID2, | |
43 | SCCTRL6, /* Cacheable write-through, allocate on reads only */ | |
44 | SCCTRL7, /* Cacheable write-back, allocate on reads only */ | |
45 | }; | |
46 | ||
47 | enum pl330_dstcachectrl { | |
48 | DCCTRL0, /* Noncacheable and nonbufferable */ | |
49 | DCCTRL1, /* Bufferable only */ | |
50 | DCCTRL2, /* Cacheable, but do not allocate */ | |
51 | DCCTRL3, /* Cacheable and bufferable, but do not allocate */ | |
ef08e782 | 52 | DINVALID1, /* AWCACHE = 0x1000 */ |
b7d861d9 BK |
53 | DINVALID2, |
54 | DCCTRL6, /* Cacheable write-through, allocate on writes only */ | |
55 | DCCTRL7, /* Cacheable write-back, allocate on writes only */ | |
56 | }; | |
57 | ||
58 | enum pl330_byteswap { | |
59 | SWAP_NO, | |
60 | SWAP_2, | |
61 | SWAP_4, | |
62 | SWAP_8, | |
63 | SWAP_16, | |
64 | }; | |
65 | ||
66 | enum pl330_reqtype { | |
67 | MEMTOMEM, | |
68 | MEMTODEV, | |
69 | DEVTOMEM, | |
70 | DEVTODEV, | |
71 | }; | |
72 | ||
73 | /* Register and Bit field Definitions */ | |
74 | #define DS 0x0 | |
75 | #define DS_ST_STOP 0x0 | |
76 | #define DS_ST_EXEC 0x1 | |
77 | #define DS_ST_CMISS 0x2 | |
78 | #define DS_ST_UPDTPC 0x3 | |
79 | #define DS_ST_WFE 0x4 | |
80 | #define DS_ST_ATBRR 0x5 | |
81 | #define DS_ST_QBUSY 0x6 | |
82 | #define DS_ST_WFP 0x7 | |
83 | #define DS_ST_KILL 0x8 | |
84 | #define DS_ST_CMPLT 0x9 | |
85 | #define DS_ST_FLTCMP 0xe | |
86 | #define DS_ST_FAULT 0xf | |
87 | ||
88 | #define DPC 0x4 | |
89 | #define INTEN 0x20 | |
90 | #define ES 0x24 | |
91 | #define INTSTATUS 0x28 | |
92 | #define INTCLR 0x2c | |
93 | #define FSM 0x30 | |
94 | #define FSC 0x34 | |
95 | #define FTM 0x38 | |
96 | ||
97 | #define _FTC 0x40 | |
98 | #define FTC(n) (_FTC + (n)*0x4) | |
99 | ||
100 | #define _CS 0x100 | |
101 | #define CS(n) (_CS + (n)*0x8) | |
102 | #define CS_CNS (1 << 21) | |
103 | ||
104 | #define _CPC 0x104 | |
105 | #define CPC(n) (_CPC + (n)*0x8) | |
106 | ||
107 | #define _SA 0x400 | |
108 | #define SA(n) (_SA + (n)*0x20) | |
109 | ||
110 | #define _DA 0x404 | |
111 | #define DA(n) (_DA + (n)*0x20) | |
112 | ||
113 | #define _CC 0x408 | |
114 | #define CC(n) (_CC + (n)*0x20) | |
115 | ||
116 | #define CC_SRCINC (1 << 0) | |
117 | #define CC_DSTINC (1 << 14) | |
118 | #define CC_SRCPRI (1 << 8) | |
119 | #define CC_DSTPRI (1 << 22) | |
120 | #define CC_SRCNS (1 << 9) | |
121 | #define CC_DSTNS (1 << 23) | |
122 | #define CC_SRCIA (1 << 10) | |
123 | #define CC_DSTIA (1 << 24) | |
124 | #define CC_SRCBRSTLEN_SHFT 4 | |
125 | #define CC_DSTBRSTLEN_SHFT 18 | |
126 | #define CC_SRCBRSTSIZE_SHFT 1 | |
127 | #define CC_DSTBRSTSIZE_SHFT 15 | |
128 | #define CC_SRCCCTRL_SHFT 11 | |
129 | #define CC_SRCCCTRL_MASK 0x7 | |
130 | #define CC_DSTCCTRL_SHFT 25 | |
131 | #define CC_DRCCCTRL_MASK 0x7 | |
132 | #define CC_SWAP_SHFT 28 | |
133 | ||
134 | #define _LC0 0x40c | |
135 | #define LC0(n) (_LC0 + (n)*0x20) | |
136 | ||
137 | #define _LC1 0x410 | |
138 | #define LC1(n) (_LC1 + (n)*0x20) | |
139 | ||
140 | #define DBGSTATUS 0xd00 | |
141 | #define DBG_BUSY (1 << 0) | |
142 | ||
143 | #define DBGCMD 0xd04 | |
144 | #define DBGINST0 0xd08 | |
145 | #define DBGINST1 0xd0c | |
146 | ||
147 | #define CR0 0xe00 | |
148 | #define CR1 0xe04 | |
149 | #define CR2 0xe08 | |
150 | #define CR3 0xe0c | |
151 | #define CR4 0xe10 | |
152 | #define CRD 0xe14 | |
153 | ||
154 | #define PERIPH_ID 0xfe0 | |
3ecf51a4 BK |
155 | #define PERIPH_REV_SHIFT 20 |
156 | #define PERIPH_REV_MASK 0xf | |
157 | #define PERIPH_REV_R0P0 0 | |
158 | #define PERIPH_REV_R1P0 1 | |
159 | #define PERIPH_REV_R1P1 2 | |
b7d861d9 BK |
160 | |
161 | #define CR0_PERIPH_REQ_SET (1 << 0) | |
162 | #define CR0_BOOT_EN_SET (1 << 1) | |
163 | #define CR0_BOOT_MAN_NS (1 << 2) | |
164 | #define CR0_NUM_CHANS_SHIFT 4 | |
165 | #define CR0_NUM_CHANS_MASK 0x7 | |
166 | #define CR0_NUM_PERIPH_SHIFT 12 | |
167 | #define CR0_NUM_PERIPH_MASK 0x1f | |
168 | #define CR0_NUM_EVENTS_SHIFT 17 | |
169 | #define CR0_NUM_EVENTS_MASK 0x1f | |
170 | ||
171 | #define CR1_ICACHE_LEN_SHIFT 0 | |
172 | #define CR1_ICACHE_LEN_MASK 0x7 | |
173 | #define CR1_NUM_ICACHELINES_SHIFT 4 | |
174 | #define CR1_NUM_ICACHELINES_MASK 0xf | |
175 | ||
176 | #define CRD_DATA_WIDTH_SHIFT 0 | |
177 | #define CRD_DATA_WIDTH_MASK 0x7 | |
178 | #define CRD_WR_CAP_SHIFT 4 | |
179 | #define CRD_WR_CAP_MASK 0x7 | |
180 | #define CRD_WR_Q_DEP_SHIFT 8 | |
181 | #define CRD_WR_Q_DEP_MASK 0xf | |
182 | #define CRD_RD_CAP_SHIFT 12 | |
183 | #define CRD_RD_CAP_MASK 0x7 | |
184 | #define CRD_RD_Q_DEP_SHIFT 16 | |
185 | #define CRD_RD_Q_DEP_MASK 0xf | |
186 | #define CRD_DATA_BUFF_SHIFT 20 | |
187 | #define CRD_DATA_BUFF_MASK 0x3ff | |
188 | ||
189 | #define PART 0x330 | |
190 | #define DESIGNER 0x41 | |
191 | #define REVISION 0x0 | |
192 | #define INTEG_CFG 0x0 | |
193 | #define PERIPH_ID_VAL ((PART << 0) | (DESIGNER << 12)) | |
194 | ||
b7d861d9 BK |
195 | #define PL330_STATE_STOPPED (1 << 0) |
196 | #define PL330_STATE_EXECUTING (1 << 1) | |
197 | #define PL330_STATE_WFE (1 << 2) | |
198 | #define PL330_STATE_FAULTING (1 << 3) | |
199 | #define PL330_STATE_COMPLETING (1 << 4) | |
200 | #define PL330_STATE_WFP (1 << 5) | |
201 | #define PL330_STATE_KILLING (1 << 6) | |
202 | #define PL330_STATE_FAULT_COMPLETING (1 << 7) | |
203 | #define PL330_STATE_CACHEMISS (1 << 8) | |
204 | #define PL330_STATE_UPDTPC (1 << 9) | |
205 | #define PL330_STATE_ATBARRIER (1 << 10) | |
206 | #define PL330_STATE_QUEUEBUSY (1 << 11) | |
207 | #define PL330_STATE_INVALID (1 << 15) | |
208 | ||
209 | #define PL330_STABLE_STATES (PL330_STATE_STOPPED | PL330_STATE_EXECUTING \ | |
210 | | PL330_STATE_WFE | PL330_STATE_FAULTING) | |
211 | ||
212 | #define CMD_DMAADDH 0x54 | |
213 | #define CMD_DMAEND 0x00 | |
214 | #define CMD_DMAFLUSHP 0x35 | |
215 | #define CMD_DMAGO 0xa0 | |
216 | #define CMD_DMALD 0x04 | |
217 | #define CMD_DMALDP 0x25 | |
218 | #define CMD_DMALP 0x20 | |
219 | #define CMD_DMALPEND 0x28 | |
220 | #define CMD_DMAKILL 0x01 | |
221 | #define CMD_DMAMOV 0xbc | |
222 | #define CMD_DMANOP 0x18 | |
223 | #define CMD_DMARMB 0x12 | |
224 | #define CMD_DMASEV 0x34 | |
225 | #define CMD_DMAST 0x08 | |
226 | #define CMD_DMASTP 0x29 | |
227 | #define CMD_DMASTZ 0x0c | |
228 | #define CMD_DMAWFE 0x36 | |
229 | #define CMD_DMAWFP 0x30 | |
230 | #define CMD_DMAWMB 0x13 | |
231 | ||
232 | #define SZ_DMAADDH 3 | |
233 | #define SZ_DMAEND 1 | |
234 | #define SZ_DMAFLUSHP 2 | |
235 | #define SZ_DMALD 1 | |
236 | #define SZ_DMALDP 2 | |
237 | #define SZ_DMALP 2 | |
238 | #define SZ_DMALPEND 2 | |
239 | #define SZ_DMAKILL 1 | |
240 | #define SZ_DMAMOV 6 | |
241 | #define SZ_DMANOP 1 | |
242 | #define SZ_DMARMB 1 | |
243 | #define SZ_DMASEV 2 | |
244 | #define SZ_DMAST 1 | |
245 | #define SZ_DMASTP 2 | |
246 | #define SZ_DMASTZ 1 | |
247 | #define SZ_DMAWFE 2 | |
248 | #define SZ_DMAWFP 2 | |
249 | #define SZ_DMAWMB 1 | |
250 | #define SZ_DMAGO 6 | |
251 | ||
252 | #define BRST_LEN(ccr) ((((ccr) >> CC_SRCBRSTLEN_SHFT) & 0xf) + 1) | |
253 | #define BRST_SIZE(ccr) (1 << (((ccr) >> CC_SRCBRSTSIZE_SHFT) & 0x7)) | |
254 | ||
255 | #define BYTE_TO_BURST(b, ccr) ((b) / BRST_SIZE(ccr) / BRST_LEN(ccr)) | |
256 | #define BURST_TO_BYTE(c, ccr) ((c) * BRST_SIZE(ccr) * BRST_LEN(ccr)) | |
257 | ||
258 | /* | |
259 | * With 256 bytes, we can do more than 2.5MB and 5MB xfers per req | |
260 | * at 1byte/burst for P<->M and M<->M respectively. | |
261 | * For typical scenario, at 1word/burst, 10MB and 20MB xfers per req | |
262 | * should be enough for P<->M and M<->M respectively. | |
263 | */ | |
264 | #define MCODE_BUFF_PER_REQ 256 | |
265 | ||
266 | /* If the _pl330_req is available to the client */ | |
267 | #define IS_FREE(req) (*((u8 *)((req)->mc_cpu)) == CMD_DMAEND) | |
268 | ||
269 | /* Use this _only_ to wait on transient states */ | |
270 | #define UNTIL(t, s) while (!(_state(t) & (s))) cpu_relax(); | |
271 | ||
272 | #ifdef PL330_DEBUG_MCGEN | |
273 | static unsigned cmd_line; | |
274 | #define PL330_DBGCMD_DUMP(off, x...) do { \ | |
275 | printk("%x:", cmd_line); \ | |
276 | printk(x); \ | |
277 | cmd_line += off; \ | |
278 | } while (0) | |
279 | #define PL330_DBGMC_START(addr) (cmd_line = addr) | |
280 | #else | |
281 | #define PL330_DBGCMD_DUMP(off, x...) do {} while (0) | |
282 | #define PL330_DBGMC_START(addr) do {} while (0) | |
283 | #endif | |
284 | ||
285 | /* The number of default descriptors */ | |
d2ebfb33 | 286 | |
b3040e40 JB |
287 | #define NR_DEFAULT_DESC 16 |
288 | ||
b7d861d9 BK |
289 | /* Populated by the PL330 core driver for DMA API driver's info */ |
290 | struct pl330_config { | |
291 | u32 periph_id; | |
b7d861d9 BK |
292 | #define DMAC_MODE_NS (1 << 0) |
293 | unsigned int mode; | |
294 | unsigned int data_bus_width:10; /* In number of bits */ | |
295 | unsigned int data_buf_dep:10; | |
296 | unsigned int num_chan:4; | |
297 | unsigned int num_peri:6; | |
298 | u32 peri_ns; | |
299 | unsigned int num_events:6; | |
300 | u32 irq_ns; | |
301 | }; | |
302 | ||
303 | /* Handle to the DMAC provided to the PL330 core */ | |
304 | struct pl330_info { | |
305 | /* Owning device */ | |
306 | struct device *dev; | |
307 | /* Size of MicroCode buffers for each channel. */ | |
308 | unsigned mcbufsz; | |
309 | /* ioremap'ed address of PL330 registers. */ | |
310 | void __iomem *base; | |
311 | /* Client can freely use it. */ | |
312 | void *client_data; | |
313 | /* PL330 core data, Client must not touch it. */ | |
314 | void *pl330_data; | |
315 | /* Populated by the PL330 core driver during pl330_add */ | |
316 | struct pl330_config pcfg; | |
317 | /* | |
318 | * If the DMAC has some reset mechanism, then the | |
319 | * client may want to provide pointer to the method. | |
320 | */ | |
321 | void (*dmac_reset)(struct pl330_info *pi); | |
322 | }; | |
323 | ||
324 | /** | |
325 | * Request Configuration. | |
326 | * The PL330 core does not modify this and uses the last | |
327 | * working configuration if the request doesn't provide any. | |
328 | * | |
329 | * The Client may want to provide this info only for the | |
330 | * first request and a request with new settings. | |
331 | */ | |
332 | struct pl330_reqcfg { | |
333 | /* Address Incrementing */ | |
334 | unsigned dst_inc:1; | |
335 | unsigned src_inc:1; | |
336 | ||
337 | /* | |
338 | * For now, the SRC & DST protection levels | |
339 | * and burst size/length are assumed same. | |
340 | */ | |
341 | bool nonsecure; | |
342 | bool privileged; | |
343 | bool insnaccess; | |
344 | unsigned brst_len:5; | |
345 | unsigned brst_size:3; /* in power of 2 */ | |
346 | ||
347 | enum pl330_dstcachectrl dcctl; | |
348 | enum pl330_srccachectrl scctl; | |
349 | enum pl330_byteswap swap; | |
3ecf51a4 | 350 | struct pl330_config *pcfg; |
b7d861d9 BK |
351 | }; |
352 | ||
353 | /* | |
354 | * One cycle of DMAC operation. | |
355 | * There may be more than one xfer in a request. | |
356 | */ | |
357 | struct pl330_xfer { | |
358 | u32 src_addr; | |
359 | u32 dst_addr; | |
360 | /* Size to xfer */ | |
361 | u32 bytes; | |
362 | /* | |
363 | * Pointer to next xfer in the list. | |
364 | * The last xfer in the req must point to NULL. | |
365 | */ | |
366 | struct pl330_xfer *next; | |
367 | }; | |
368 | ||
369 | /* The xfer callbacks are made with one of these arguments. */ | |
370 | enum pl330_op_err { | |
371 | /* The all xfers in the request were success. */ | |
372 | PL330_ERR_NONE, | |
373 | /* If req aborted due to global error. */ | |
374 | PL330_ERR_ABORT, | |
375 | /* If req failed due to problem with Channel. */ | |
376 | PL330_ERR_FAIL, | |
377 | }; | |
378 | ||
379 | /* A request defining Scatter-Gather List ending with NULL xfer. */ | |
380 | struct pl330_req { | |
381 | enum pl330_reqtype rqtype; | |
382 | /* Index of peripheral for the xfer. */ | |
383 | unsigned peri:5; | |
384 | /* Unique token for this xfer, set by the client. */ | |
385 | void *token; | |
386 | /* Callback to be called after xfer. */ | |
387 | void (*xfer_cb)(void *token, enum pl330_op_err err); | |
388 | /* If NULL, req will be done at last set parameters. */ | |
389 | struct pl330_reqcfg *cfg; | |
390 | /* Pointer to first xfer in the request. */ | |
391 | struct pl330_xfer *x; | |
fdec53d5 JM |
392 | /* Hook to attach to DMAC's list of reqs with due callback */ |
393 | struct list_head rqd; | |
b7d861d9 BK |
394 | }; |
395 | ||
396 | /* | |
397 | * To know the status of the channel and DMAC, the client | |
398 | * provides a pointer to this structure. The PL330 core | |
399 | * fills it with current information. | |
400 | */ | |
401 | struct pl330_chanstatus { | |
402 | /* | |
403 | * If the DMAC engine halted due to some error, | |
404 | * the client should remove-add DMAC. | |
405 | */ | |
406 | bool dmac_halted; | |
407 | /* | |
408 | * If channel is halted due to some error, | |
409 | * the client should ABORT/FLUSH and START the channel. | |
410 | */ | |
411 | bool faulting; | |
412 | /* Location of last load */ | |
413 | u32 src_addr; | |
414 | /* Location of last store */ | |
415 | u32 dst_addr; | |
416 | /* | |
417 | * Pointer to the currently active req, NULL if channel is | |
418 | * inactive, even though the requests may be present. | |
419 | */ | |
420 | struct pl330_req *top_req; | |
421 | /* Pointer to req waiting second in the queue if any. */ | |
422 | struct pl330_req *wait_req; | |
423 | }; | |
424 | ||
425 | enum pl330_chan_op { | |
426 | /* Start the channel */ | |
427 | PL330_OP_START, | |
428 | /* Abort the active xfer */ | |
429 | PL330_OP_ABORT, | |
430 | /* Stop xfer and flush queue */ | |
431 | PL330_OP_FLUSH, | |
432 | }; | |
433 | ||
434 | struct _xfer_spec { | |
435 | u32 ccr; | |
436 | struct pl330_req *r; | |
437 | struct pl330_xfer *x; | |
438 | }; | |
439 | ||
440 | enum dmamov_dst { | |
441 | SAR = 0, | |
442 | CCR, | |
443 | DAR, | |
444 | }; | |
445 | ||
446 | enum pl330_dst { | |
447 | SRC = 0, | |
448 | DST, | |
449 | }; | |
450 | ||
451 | enum pl330_cond { | |
452 | SINGLE, | |
453 | BURST, | |
454 | ALWAYS, | |
455 | }; | |
456 | ||
457 | struct _pl330_req { | |
458 | u32 mc_bus; | |
459 | void *mc_cpu; | |
460 | /* Number of bytes taken to setup MC for the req */ | |
461 | u32 mc_len; | |
462 | struct pl330_req *r; | |
b7d861d9 BK |
463 | }; |
464 | ||
465 | /* ToBeDone for tasklet */ | |
466 | struct _pl330_tbd { | |
467 | bool reset_dmac; | |
468 | bool reset_mngr; | |
469 | u8 reset_chan; | |
470 | }; | |
471 | ||
472 | /* A DMAC Thread */ | |
473 | struct pl330_thread { | |
474 | u8 id; | |
475 | int ev; | |
476 | /* If the channel is not yet acquired by any client */ | |
477 | bool free; | |
478 | /* Parent DMAC */ | |
479 | struct pl330_dmac *dmac; | |
480 | /* Only two at a time */ | |
481 | struct _pl330_req req[2]; | |
482 | /* Index of the last enqueued request */ | |
483 | unsigned lstenq; | |
484 | /* Index of the last submitted request or -1 if the DMA is stopped */ | |
485 | int req_running; | |
486 | }; | |
487 | ||
488 | enum pl330_dmac_state { | |
489 | UNINIT, | |
490 | INIT, | |
491 | DYING, | |
492 | }; | |
493 | ||
494 | /* A DMAC */ | |
495 | struct pl330_dmac { | |
496 | spinlock_t lock; | |
497 | /* Holds list of reqs with due callbacks */ | |
498 | struct list_head req_done; | |
499 | /* Pointer to platform specific stuff */ | |
500 | struct pl330_info *pinfo; | |
501 | /* Maximum possible events/irqs */ | |
502 | int events[32]; | |
503 | /* BUS address of MicroCode buffer */ | |
fed8c457 | 504 | dma_addr_t mcode_bus; |
b7d861d9 BK |
505 | /* CPU address of MicroCode buffer */ |
506 | void *mcode_cpu; | |
507 | /* List of all Channel threads */ | |
508 | struct pl330_thread *channels; | |
509 | /* Pointer to the MANAGER thread */ | |
510 | struct pl330_thread *manager; | |
511 | /* To handle bad news in interrupt */ | |
512 | struct tasklet_struct tasks; | |
513 | struct _pl330_tbd dmac_tbd; | |
514 | /* State of DMAC operation */ | |
515 | enum pl330_dmac_state state; | |
516 | }; | |
517 | ||
b3040e40 JB |
518 | enum desc_status { |
519 | /* In the DMAC pool */ | |
520 | FREE, | |
521 | /* | |
d73111c6 | 522 | * Allocated to some channel during prep_xxx |
b3040e40 JB |
523 | * Also may be sitting on the work_list. |
524 | */ | |
525 | PREP, | |
526 | /* | |
527 | * Sitting on the work_list and already submitted | |
528 | * to the PL330 core. Not more than two descriptors | |
529 | * of a channel can be BUSY at any time. | |
530 | */ | |
531 | BUSY, | |
532 | /* | |
533 | * Sitting on the channel work_list but xfer done | |
534 | * by PL330 core | |
535 | */ | |
536 | DONE, | |
537 | }; | |
538 | ||
539 | struct dma_pl330_chan { | |
540 | /* Schedule desc completion */ | |
541 | struct tasklet_struct task; | |
542 | ||
543 | /* DMA-Engine Channel */ | |
544 | struct dma_chan chan; | |
545 | ||
b3040e40 JB |
546 | /* List of to be xfered descriptors */ |
547 | struct list_head work_list; | |
548 | ||
549 | /* Pointer to the DMAC that manages this channel, | |
550 | * NULL if the channel is available to be acquired. | |
551 | * As the parent, this DMAC also provides descriptors | |
552 | * to the channel. | |
553 | */ | |
554 | struct dma_pl330_dmac *dmac; | |
555 | ||
556 | /* To protect channel manipulation */ | |
557 | spinlock_t lock; | |
558 | ||
559 | /* Token of a hardware channel thread of PL330 DMAC | |
560 | * NULL if the channel is available to be acquired. | |
561 | */ | |
562 | void *pl330_chid; | |
1b9bb715 BK |
563 | |
564 | /* For D-to-M and M-to-D channels */ | |
565 | int burst_sz; /* the peripheral fifo width */ | |
1d0c1d60 | 566 | int burst_len; /* the number of burst */ |
1b9bb715 | 567 | dma_addr_t fifo_addr; |
42bc9cf4 BK |
568 | |
569 | /* for cyclic capability */ | |
570 | bool cyclic; | |
b3040e40 JB |
571 | }; |
572 | ||
573 | struct dma_pl330_dmac { | |
574 | struct pl330_info pif; | |
575 | ||
576 | /* DMA-Engine Device */ | |
577 | struct dma_device ddma; | |
578 | ||
579 | /* Pool of descriptors available for the DMAC's channels */ | |
580 | struct list_head desc_pool; | |
581 | /* To protect desc_pool manipulation */ | |
582 | spinlock_t pool_lock; | |
583 | ||
584 | /* Peripheral channels connected to this DMAC */ | |
4e0e6109 | 585 | struct dma_pl330_chan *peripherals; /* keep at end */ |
b3040e40 JB |
586 | }; |
587 | ||
588 | struct dma_pl330_desc { | |
589 | /* To attach to a queue as child */ | |
590 | struct list_head node; | |
591 | ||
592 | /* Descriptor for the DMA Engine API */ | |
593 | struct dma_async_tx_descriptor txd; | |
594 | ||
595 | /* Xfer for PL330 core */ | |
596 | struct pl330_xfer px; | |
597 | ||
598 | struct pl330_reqcfg rqcfg; | |
599 | struct pl330_req req; | |
600 | ||
601 | enum desc_status status; | |
602 | ||
603 | /* The channel which currently holds this desc */ | |
604 | struct dma_pl330_chan *pchan; | |
605 | }; | |
606 | ||
34d19355 PV |
607 | struct dma_pl330_filter_args { |
608 | struct dma_pl330_dmac *pdmac; | |
609 | unsigned int chan_id; | |
610 | }; | |
611 | ||
b7d861d9 BK |
612 | static inline void _callback(struct pl330_req *r, enum pl330_op_err err) |
613 | { | |
614 | if (r && r->xfer_cb) | |
615 | r->xfer_cb(r->token, err); | |
616 | } | |
617 | ||
618 | static inline bool _queue_empty(struct pl330_thread *thrd) | |
619 | { | |
620 | return (IS_FREE(&thrd->req[0]) && IS_FREE(&thrd->req[1])) | |
621 | ? true : false; | |
622 | } | |
623 | ||
624 | static inline bool _queue_full(struct pl330_thread *thrd) | |
625 | { | |
626 | return (IS_FREE(&thrd->req[0]) || IS_FREE(&thrd->req[1])) | |
627 | ? false : true; | |
628 | } | |
629 | ||
630 | static inline bool is_manager(struct pl330_thread *thrd) | |
631 | { | |
632 | struct pl330_dmac *pl330 = thrd->dmac; | |
633 | ||
634 | /* MANAGER is indexed at the end */ | |
635 | if (thrd->id == pl330->pinfo->pcfg.num_chan) | |
636 | return true; | |
637 | else | |
638 | return false; | |
639 | } | |
640 | ||
641 | /* If manager of the thread is in Non-Secure mode */ | |
642 | static inline bool _manager_ns(struct pl330_thread *thrd) | |
643 | { | |
644 | struct pl330_dmac *pl330 = thrd->dmac; | |
645 | ||
646 | return (pl330->pinfo->pcfg.mode & DMAC_MODE_NS) ? true : false; | |
647 | } | |
648 | ||
3ecf51a4 BK |
649 | static inline u32 get_revision(u32 periph_id) |
650 | { | |
651 | return (periph_id >> PERIPH_REV_SHIFT) & PERIPH_REV_MASK; | |
652 | } | |
653 | ||
b7d861d9 BK |
654 | static inline u32 _emit_ADDH(unsigned dry_run, u8 buf[], |
655 | enum pl330_dst da, u16 val) | |
656 | { | |
657 | if (dry_run) | |
658 | return SZ_DMAADDH; | |
659 | ||
660 | buf[0] = CMD_DMAADDH; | |
661 | buf[0] |= (da << 1); | |
662 | *((u16 *)&buf[1]) = val; | |
663 | ||
664 | PL330_DBGCMD_DUMP(SZ_DMAADDH, "\tDMAADDH %s %u\n", | |
665 | da == 1 ? "DA" : "SA", val); | |
666 | ||
667 | return SZ_DMAADDH; | |
668 | } | |
669 | ||
670 | static inline u32 _emit_END(unsigned dry_run, u8 buf[]) | |
671 | { | |
672 | if (dry_run) | |
673 | return SZ_DMAEND; | |
674 | ||
675 | buf[0] = CMD_DMAEND; | |
676 | ||
677 | PL330_DBGCMD_DUMP(SZ_DMAEND, "\tDMAEND\n"); | |
678 | ||
679 | return SZ_DMAEND; | |
680 | } | |
681 | ||
682 | static inline u32 _emit_FLUSHP(unsigned dry_run, u8 buf[], u8 peri) | |
683 | { | |
684 | if (dry_run) | |
685 | return SZ_DMAFLUSHP; | |
686 | ||
687 | buf[0] = CMD_DMAFLUSHP; | |
688 | ||
689 | peri &= 0x1f; | |
690 | peri <<= 3; | |
691 | buf[1] = peri; | |
692 | ||
693 | PL330_DBGCMD_DUMP(SZ_DMAFLUSHP, "\tDMAFLUSHP %u\n", peri >> 3); | |
694 | ||
695 | return SZ_DMAFLUSHP; | |
696 | } | |
697 | ||
698 | static inline u32 _emit_LD(unsigned dry_run, u8 buf[], enum pl330_cond cond) | |
699 | { | |
700 | if (dry_run) | |
701 | return SZ_DMALD; | |
702 | ||
703 | buf[0] = CMD_DMALD; | |
704 | ||
705 | if (cond == SINGLE) | |
706 | buf[0] |= (0 << 1) | (1 << 0); | |
707 | else if (cond == BURST) | |
708 | buf[0] |= (1 << 1) | (1 << 0); | |
709 | ||
710 | PL330_DBGCMD_DUMP(SZ_DMALD, "\tDMALD%c\n", | |
711 | cond == SINGLE ? 'S' : (cond == BURST ? 'B' : 'A')); | |
712 | ||
713 | return SZ_DMALD; | |
714 | } | |
715 | ||
716 | static inline u32 _emit_LDP(unsigned dry_run, u8 buf[], | |
717 | enum pl330_cond cond, u8 peri) | |
718 | { | |
719 | if (dry_run) | |
720 | return SZ_DMALDP; | |
721 | ||
722 | buf[0] = CMD_DMALDP; | |
723 | ||
724 | if (cond == BURST) | |
725 | buf[0] |= (1 << 1); | |
726 | ||
727 | peri &= 0x1f; | |
728 | peri <<= 3; | |
729 | buf[1] = peri; | |
730 | ||
731 | PL330_DBGCMD_DUMP(SZ_DMALDP, "\tDMALDP%c %u\n", | |
732 | cond == SINGLE ? 'S' : 'B', peri >> 3); | |
733 | ||
734 | return SZ_DMALDP; | |
735 | } | |
736 | ||
737 | static inline u32 _emit_LP(unsigned dry_run, u8 buf[], | |
738 | unsigned loop, u8 cnt) | |
739 | { | |
740 | if (dry_run) | |
741 | return SZ_DMALP; | |
742 | ||
743 | buf[0] = CMD_DMALP; | |
744 | ||
745 | if (loop) | |
746 | buf[0] |= (1 << 1); | |
747 | ||
748 | cnt--; /* DMAC increments by 1 internally */ | |
749 | buf[1] = cnt; | |
750 | ||
751 | PL330_DBGCMD_DUMP(SZ_DMALP, "\tDMALP_%c %u\n", loop ? '1' : '0', cnt); | |
752 | ||
753 | return SZ_DMALP; | |
754 | } | |
755 | ||
756 | struct _arg_LPEND { | |
757 | enum pl330_cond cond; | |
758 | bool forever; | |
759 | unsigned loop; | |
760 | u8 bjump; | |
761 | }; | |
762 | ||
763 | static inline u32 _emit_LPEND(unsigned dry_run, u8 buf[], | |
764 | const struct _arg_LPEND *arg) | |
765 | { | |
766 | enum pl330_cond cond = arg->cond; | |
767 | bool forever = arg->forever; | |
768 | unsigned loop = arg->loop; | |
769 | u8 bjump = arg->bjump; | |
770 | ||
771 | if (dry_run) | |
772 | return SZ_DMALPEND; | |
773 | ||
774 | buf[0] = CMD_DMALPEND; | |
775 | ||
776 | if (loop) | |
777 | buf[0] |= (1 << 2); | |
778 | ||
779 | if (!forever) | |
780 | buf[0] |= (1 << 4); | |
781 | ||
782 | if (cond == SINGLE) | |
783 | buf[0] |= (0 << 1) | (1 << 0); | |
784 | else if (cond == BURST) | |
785 | buf[0] |= (1 << 1) | (1 << 0); | |
786 | ||
787 | buf[1] = bjump; | |
788 | ||
789 | PL330_DBGCMD_DUMP(SZ_DMALPEND, "\tDMALP%s%c_%c bjmpto_%x\n", | |
790 | forever ? "FE" : "END", | |
791 | cond == SINGLE ? 'S' : (cond == BURST ? 'B' : 'A'), | |
792 | loop ? '1' : '0', | |
793 | bjump); | |
794 | ||
795 | return SZ_DMALPEND; | |
796 | } | |
797 | ||
798 | static inline u32 _emit_KILL(unsigned dry_run, u8 buf[]) | |
799 | { | |
800 | if (dry_run) | |
801 | return SZ_DMAKILL; | |
802 | ||
803 | buf[0] = CMD_DMAKILL; | |
804 | ||
805 | return SZ_DMAKILL; | |
806 | } | |
807 | ||
808 | static inline u32 _emit_MOV(unsigned dry_run, u8 buf[], | |
809 | enum dmamov_dst dst, u32 val) | |
810 | { | |
811 | if (dry_run) | |
812 | return SZ_DMAMOV; | |
813 | ||
814 | buf[0] = CMD_DMAMOV; | |
815 | buf[1] = dst; | |
816 | *((u32 *)&buf[2]) = val; | |
817 | ||
818 | PL330_DBGCMD_DUMP(SZ_DMAMOV, "\tDMAMOV %s 0x%x\n", | |
819 | dst == SAR ? "SAR" : (dst == DAR ? "DAR" : "CCR"), val); | |
820 | ||
821 | return SZ_DMAMOV; | |
822 | } | |
823 | ||
824 | static inline u32 _emit_NOP(unsigned dry_run, u8 buf[]) | |
825 | { | |
826 | if (dry_run) | |
827 | return SZ_DMANOP; | |
828 | ||
829 | buf[0] = CMD_DMANOP; | |
830 | ||
831 | PL330_DBGCMD_DUMP(SZ_DMANOP, "\tDMANOP\n"); | |
832 | ||
833 | return SZ_DMANOP; | |
834 | } | |
835 | ||
836 | static inline u32 _emit_RMB(unsigned dry_run, u8 buf[]) | |
837 | { | |
838 | if (dry_run) | |
839 | return SZ_DMARMB; | |
840 | ||
841 | buf[0] = CMD_DMARMB; | |
842 | ||
843 | PL330_DBGCMD_DUMP(SZ_DMARMB, "\tDMARMB\n"); | |
844 | ||
845 | return SZ_DMARMB; | |
846 | } | |
847 | ||
848 | static inline u32 _emit_SEV(unsigned dry_run, u8 buf[], u8 ev) | |
849 | { | |
850 | if (dry_run) | |
851 | return SZ_DMASEV; | |
852 | ||
853 | buf[0] = CMD_DMASEV; | |
854 | ||
855 | ev &= 0x1f; | |
856 | ev <<= 3; | |
857 | buf[1] = ev; | |
858 | ||
859 | PL330_DBGCMD_DUMP(SZ_DMASEV, "\tDMASEV %u\n", ev >> 3); | |
860 | ||
861 | return SZ_DMASEV; | |
862 | } | |
863 | ||
864 | static inline u32 _emit_ST(unsigned dry_run, u8 buf[], enum pl330_cond cond) | |
865 | { | |
866 | if (dry_run) | |
867 | return SZ_DMAST; | |
868 | ||
869 | buf[0] = CMD_DMAST; | |
870 | ||
871 | if (cond == SINGLE) | |
872 | buf[0] |= (0 << 1) | (1 << 0); | |
873 | else if (cond == BURST) | |
874 | buf[0] |= (1 << 1) | (1 << 0); | |
875 | ||
876 | PL330_DBGCMD_DUMP(SZ_DMAST, "\tDMAST%c\n", | |
877 | cond == SINGLE ? 'S' : (cond == BURST ? 'B' : 'A')); | |
878 | ||
879 | return SZ_DMAST; | |
880 | } | |
881 | ||
882 | static inline u32 _emit_STP(unsigned dry_run, u8 buf[], | |
883 | enum pl330_cond cond, u8 peri) | |
884 | { | |
885 | if (dry_run) | |
886 | return SZ_DMASTP; | |
887 | ||
888 | buf[0] = CMD_DMASTP; | |
889 | ||
890 | if (cond == BURST) | |
891 | buf[0] |= (1 << 1); | |
892 | ||
893 | peri &= 0x1f; | |
894 | peri <<= 3; | |
895 | buf[1] = peri; | |
896 | ||
897 | PL330_DBGCMD_DUMP(SZ_DMASTP, "\tDMASTP%c %u\n", | |
898 | cond == SINGLE ? 'S' : 'B', peri >> 3); | |
899 | ||
900 | return SZ_DMASTP; | |
901 | } | |
902 | ||
903 | static inline u32 _emit_STZ(unsigned dry_run, u8 buf[]) | |
904 | { | |
905 | if (dry_run) | |
906 | return SZ_DMASTZ; | |
907 | ||
908 | buf[0] = CMD_DMASTZ; | |
909 | ||
910 | PL330_DBGCMD_DUMP(SZ_DMASTZ, "\tDMASTZ\n"); | |
911 | ||
912 | return SZ_DMASTZ; | |
913 | } | |
914 | ||
915 | static inline u32 _emit_WFE(unsigned dry_run, u8 buf[], u8 ev, | |
916 | unsigned invalidate) | |
917 | { | |
918 | if (dry_run) | |
919 | return SZ_DMAWFE; | |
920 | ||
921 | buf[0] = CMD_DMAWFE; | |
922 | ||
923 | ev &= 0x1f; | |
924 | ev <<= 3; | |
925 | buf[1] = ev; | |
926 | ||
927 | if (invalidate) | |
928 | buf[1] |= (1 << 1); | |
929 | ||
930 | PL330_DBGCMD_DUMP(SZ_DMAWFE, "\tDMAWFE %u%s\n", | |
931 | ev >> 3, invalidate ? ", I" : ""); | |
932 | ||
933 | return SZ_DMAWFE; | |
934 | } | |
935 | ||
936 | static inline u32 _emit_WFP(unsigned dry_run, u8 buf[], | |
937 | enum pl330_cond cond, u8 peri) | |
938 | { | |
939 | if (dry_run) | |
940 | return SZ_DMAWFP; | |
941 | ||
942 | buf[0] = CMD_DMAWFP; | |
943 | ||
944 | if (cond == SINGLE) | |
945 | buf[0] |= (0 << 1) | (0 << 0); | |
946 | else if (cond == BURST) | |
947 | buf[0] |= (1 << 1) | (0 << 0); | |
948 | else | |
949 | buf[0] |= (0 << 1) | (1 << 0); | |
950 | ||
951 | peri &= 0x1f; | |
952 | peri <<= 3; | |
953 | buf[1] = peri; | |
954 | ||
955 | PL330_DBGCMD_DUMP(SZ_DMAWFP, "\tDMAWFP%c %u\n", | |
956 | cond == SINGLE ? 'S' : (cond == BURST ? 'B' : 'P'), peri >> 3); | |
957 | ||
958 | return SZ_DMAWFP; | |
959 | } | |
960 | ||
961 | static inline u32 _emit_WMB(unsigned dry_run, u8 buf[]) | |
962 | { | |
963 | if (dry_run) | |
964 | return SZ_DMAWMB; | |
965 | ||
966 | buf[0] = CMD_DMAWMB; | |
967 | ||
968 | PL330_DBGCMD_DUMP(SZ_DMAWMB, "\tDMAWMB\n"); | |
969 | ||
970 | return SZ_DMAWMB; | |
971 | } | |
972 | ||
973 | struct _arg_GO { | |
974 | u8 chan; | |
975 | u32 addr; | |
976 | unsigned ns; | |
977 | }; | |
978 | ||
979 | static inline u32 _emit_GO(unsigned dry_run, u8 buf[], | |
980 | const struct _arg_GO *arg) | |
981 | { | |
982 | u8 chan = arg->chan; | |
983 | u32 addr = arg->addr; | |
984 | unsigned ns = arg->ns; | |
985 | ||
986 | if (dry_run) | |
987 | return SZ_DMAGO; | |
988 | ||
989 | buf[0] = CMD_DMAGO; | |
990 | buf[0] |= (ns << 1); | |
991 | ||
992 | buf[1] = chan & 0x7; | |
993 | ||
994 | *((u32 *)&buf[2]) = addr; | |
995 | ||
996 | return SZ_DMAGO; | |
997 | } | |
998 | ||
999 | #define msecs_to_loops(t) (loops_per_jiffy / 1000 * HZ * t) | |
1000 | ||
1001 | /* Returns Time-Out */ | |
1002 | static bool _until_dmac_idle(struct pl330_thread *thrd) | |
1003 | { | |
1004 | void __iomem *regs = thrd->dmac->pinfo->base; | |
1005 | unsigned long loops = msecs_to_loops(5); | |
1006 | ||
1007 | do { | |
1008 | /* Until Manager is Idle */ | |
1009 | if (!(readl(regs + DBGSTATUS) & DBG_BUSY)) | |
1010 | break; | |
1011 | ||
1012 | cpu_relax(); | |
1013 | } while (--loops); | |
1014 | ||
1015 | if (!loops) | |
1016 | return true; | |
1017 | ||
1018 | return false; | |
1019 | } | |
1020 | ||
1021 | static inline void _execute_DBGINSN(struct pl330_thread *thrd, | |
1022 | u8 insn[], bool as_manager) | |
1023 | { | |
1024 | void __iomem *regs = thrd->dmac->pinfo->base; | |
1025 | u32 val; | |
1026 | ||
1027 | val = (insn[0] << 16) | (insn[1] << 24); | |
1028 | if (!as_manager) { | |
1029 | val |= (1 << 0); | |
1030 | val |= (thrd->id << 8); /* Channel Number */ | |
1031 | } | |
1032 | writel(val, regs + DBGINST0); | |
1033 | ||
1034 | val = *((u32 *)&insn[2]); | |
1035 | writel(val, regs + DBGINST1); | |
1036 | ||
1037 | /* If timed out due to halted state-machine */ | |
1038 | if (_until_dmac_idle(thrd)) { | |
1039 | dev_err(thrd->dmac->pinfo->dev, "DMAC halted!\n"); | |
1040 | return; | |
1041 | } | |
1042 | ||
1043 | /* Get going */ | |
1044 | writel(0, regs + DBGCMD); | |
1045 | } | |
1046 | ||
1047 | /* | |
1048 | * Mark a _pl330_req as free. | |
1049 | * We do it by writing DMAEND as the first instruction | |
1050 | * because no valid request is going to have DMAEND as | |
1051 | * its first instruction to execute. | |
1052 | */ | |
1053 | static void mark_free(struct pl330_thread *thrd, int idx) | |
1054 | { | |
1055 | struct _pl330_req *req = &thrd->req[idx]; | |
1056 | ||
1057 | _emit_END(0, req->mc_cpu); | |
1058 | req->mc_len = 0; | |
1059 | ||
1060 | thrd->req_running = -1; | |
1061 | } | |
1062 | ||
1063 | static inline u32 _state(struct pl330_thread *thrd) | |
1064 | { | |
1065 | void __iomem *regs = thrd->dmac->pinfo->base; | |
1066 | u32 val; | |
1067 | ||
1068 | if (is_manager(thrd)) | |
1069 | val = readl(regs + DS) & 0xf; | |
1070 | else | |
1071 | val = readl(regs + CS(thrd->id)) & 0xf; | |
1072 | ||
1073 | switch (val) { | |
1074 | case DS_ST_STOP: | |
1075 | return PL330_STATE_STOPPED; | |
1076 | case DS_ST_EXEC: | |
1077 | return PL330_STATE_EXECUTING; | |
1078 | case DS_ST_CMISS: | |
1079 | return PL330_STATE_CACHEMISS; | |
1080 | case DS_ST_UPDTPC: | |
1081 | return PL330_STATE_UPDTPC; | |
1082 | case DS_ST_WFE: | |
1083 | return PL330_STATE_WFE; | |
1084 | case DS_ST_FAULT: | |
1085 | return PL330_STATE_FAULTING; | |
1086 | case DS_ST_ATBRR: | |
1087 | if (is_manager(thrd)) | |
1088 | return PL330_STATE_INVALID; | |
1089 | else | |
1090 | return PL330_STATE_ATBARRIER; | |
1091 | case DS_ST_QBUSY: | |
1092 | if (is_manager(thrd)) | |
1093 | return PL330_STATE_INVALID; | |
1094 | else | |
1095 | return PL330_STATE_QUEUEBUSY; | |
1096 | case DS_ST_WFP: | |
1097 | if (is_manager(thrd)) | |
1098 | return PL330_STATE_INVALID; | |
1099 | else | |
1100 | return PL330_STATE_WFP; | |
1101 | case DS_ST_KILL: | |
1102 | if (is_manager(thrd)) | |
1103 | return PL330_STATE_INVALID; | |
1104 | else | |
1105 | return PL330_STATE_KILLING; | |
1106 | case DS_ST_CMPLT: | |
1107 | if (is_manager(thrd)) | |
1108 | return PL330_STATE_INVALID; | |
1109 | else | |
1110 | return PL330_STATE_COMPLETING; | |
1111 | case DS_ST_FLTCMP: | |
1112 | if (is_manager(thrd)) | |
1113 | return PL330_STATE_INVALID; | |
1114 | else | |
1115 | return PL330_STATE_FAULT_COMPLETING; | |
1116 | default: | |
1117 | return PL330_STATE_INVALID; | |
1118 | } | |
1119 | } | |
1120 | ||
1121 | static void _stop(struct pl330_thread *thrd) | |
1122 | { | |
1123 | void __iomem *regs = thrd->dmac->pinfo->base; | |
1124 | u8 insn[6] = {0, 0, 0, 0, 0, 0}; | |
1125 | ||
1126 | if (_state(thrd) == PL330_STATE_FAULT_COMPLETING) | |
1127 | UNTIL(thrd, PL330_STATE_FAULTING | PL330_STATE_KILLING); | |
1128 | ||
1129 | /* Return if nothing needs to be done */ | |
1130 | if (_state(thrd) == PL330_STATE_COMPLETING | |
1131 | || _state(thrd) == PL330_STATE_KILLING | |
1132 | || _state(thrd) == PL330_STATE_STOPPED) | |
1133 | return; | |
1134 | ||
1135 | _emit_KILL(0, insn); | |
1136 | ||
1137 | /* Stop generating interrupts for SEV */ | |
1138 | writel(readl(regs + INTEN) & ~(1 << thrd->ev), regs + INTEN); | |
1139 | ||
1140 | _execute_DBGINSN(thrd, insn, is_manager(thrd)); | |
1141 | } | |
1142 | ||
1143 | /* Start doing req 'idx' of thread 'thrd' */ | |
1144 | static bool _trigger(struct pl330_thread *thrd) | |
1145 | { | |
1146 | void __iomem *regs = thrd->dmac->pinfo->base; | |
1147 | struct _pl330_req *req; | |
1148 | struct pl330_req *r; | |
1149 | struct _arg_GO go; | |
1150 | unsigned ns; | |
1151 | u8 insn[6] = {0, 0, 0, 0, 0, 0}; | |
1152 | int idx; | |
1153 | ||
1154 | /* Return if already ACTIVE */ | |
1155 | if (_state(thrd) != PL330_STATE_STOPPED) | |
1156 | return true; | |
1157 | ||
1158 | idx = 1 - thrd->lstenq; | |
1159 | if (!IS_FREE(&thrd->req[idx])) | |
1160 | req = &thrd->req[idx]; | |
1161 | else { | |
1162 | idx = thrd->lstenq; | |
1163 | if (!IS_FREE(&thrd->req[idx])) | |
1164 | req = &thrd->req[idx]; | |
1165 | else | |
1166 | req = NULL; | |
1167 | } | |
1168 | ||
1169 | /* Return if no request */ | |
1170 | if (!req || !req->r) | |
1171 | return true; | |
1172 | ||
1173 | r = req->r; | |
1174 | ||
1175 | if (r->cfg) | |
1176 | ns = r->cfg->nonsecure ? 1 : 0; | |
1177 | else if (readl(regs + CS(thrd->id)) & CS_CNS) | |
1178 | ns = 1; | |
1179 | else | |
1180 | ns = 0; | |
1181 | ||
1182 | /* See 'Abort Sources' point-4 at Page 2-25 */ | |
1183 | if (_manager_ns(thrd) && !ns) | |
1184 | dev_info(thrd->dmac->pinfo->dev, "%s:%d Recipe for ABORT!\n", | |
1185 | __func__, __LINE__); | |
1186 | ||
1187 | go.chan = thrd->id; | |
1188 | go.addr = req->mc_bus; | |
1189 | go.ns = ns; | |
1190 | _emit_GO(0, insn, &go); | |
1191 | ||
1192 | /* Set to generate interrupts for SEV */ | |
1193 | writel(readl(regs + INTEN) | (1 << thrd->ev), regs + INTEN); | |
1194 | ||
1195 | /* Only manager can execute GO */ | |
1196 | _execute_DBGINSN(thrd, insn, true); | |
1197 | ||
1198 | thrd->req_running = idx; | |
1199 | ||
1200 | return true; | |
1201 | } | |
1202 | ||
1203 | static bool _start(struct pl330_thread *thrd) | |
1204 | { | |
1205 | switch (_state(thrd)) { | |
1206 | case PL330_STATE_FAULT_COMPLETING: | |
1207 | UNTIL(thrd, PL330_STATE_FAULTING | PL330_STATE_KILLING); | |
1208 | ||
1209 | if (_state(thrd) == PL330_STATE_KILLING) | |
1210 | UNTIL(thrd, PL330_STATE_STOPPED) | |
1211 | ||
1212 | case PL330_STATE_FAULTING: | |
1213 | _stop(thrd); | |
1214 | ||
1215 | case PL330_STATE_KILLING: | |
1216 | case PL330_STATE_COMPLETING: | |
1217 | UNTIL(thrd, PL330_STATE_STOPPED) | |
1218 | ||
1219 | case PL330_STATE_STOPPED: | |
1220 | return _trigger(thrd); | |
1221 | ||
1222 | case PL330_STATE_WFP: | |
1223 | case PL330_STATE_QUEUEBUSY: | |
1224 | case PL330_STATE_ATBARRIER: | |
1225 | case PL330_STATE_UPDTPC: | |
1226 | case PL330_STATE_CACHEMISS: | |
1227 | case PL330_STATE_EXECUTING: | |
1228 | return true; | |
1229 | ||
1230 | case PL330_STATE_WFE: /* For RESUME, nothing yet */ | |
1231 | default: | |
1232 | return false; | |
1233 | } | |
1234 | } | |
1235 | ||
1236 | static inline int _ldst_memtomem(unsigned dry_run, u8 buf[], | |
1237 | const struct _xfer_spec *pxs, int cyc) | |
1238 | { | |
1239 | int off = 0; | |
3ecf51a4 | 1240 | struct pl330_config *pcfg = pxs->r->cfg->pcfg; |
b7d861d9 | 1241 | |
3ecf51a4 BK |
1242 | /* check lock-up free version */ |
1243 | if (get_revision(pcfg->periph_id) >= PERIPH_REV_R1P0) { | |
1244 | while (cyc--) { | |
1245 | off += _emit_LD(dry_run, &buf[off], ALWAYS); | |
1246 | off += _emit_ST(dry_run, &buf[off], ALWAYS); | |
1247 | } | |
1248 | } else { | |
1249 | while (cyc--) { | |
1250 | off += _emit_LD(dry_run, &buf[off], ALWAYS); | |
1251 | off += _emit_RMB(dry_run, &buf[off]); | |
1252 | off += _emit_ST(dry_run, &buf[off], ALWAYS); | |
1253 | off += _emit_WMB(dry_run, &buf[off]); | |
1254 | } | |
b7d861d9 BK |
1255 | } |
1256 | ||
1257 | return off; | |
1258 | } | |
1259 | ||
1260 | static inline int _ldst_devtomem(unsigned dry_run, u8 buf[], | |
1261 | const struct _xfer_spec *pxs, int cyc) | |
1262 | { | |
1263 | int off = 0; | |
1264 | ||
1265 | while (cyc--) { | |
1266 | off += _emit_WFP(dry_run, &buf[off], SINGLE, pxs->r->peri); | |
1267 | off += _emit_LDP(dry_run, &buf[off], SINGLE, pxs->r->peri); | |
1268 | off += _emit_ST(dry_run, &buf[off], ALWAYS); | |
1269 | off += _emit_FLUSHP(dry_run, &buf[off], pxs->r->peri); | |
1270 | } | |
1271 | ||
1272 | return off; | |
1273 | } | |
1274 | ||
1275 | static inline int _ldst_memtodev(unsigned dry_run, u8 buf[], | |
1276 | const struct _xfer_spec *pxs, int cyc) | |
1277 | { | |
1278 | int off = 0; | |
1279 | ||
1280 | while (cyc--) { | |
1281 | off += _emit_WFP(dry_run, &buf[off], SINGLE, pxs->r->peri); | |
1282 | off += _emit_LD(dry_run, &buf[off], ALWAYS); | |
1283 | off += _emit_STP(dry_run, &buf[off], SINGLE, pxs->r->peri); | |
1284 | off += _emit_FLUSHP(dry_run, &buf[off], pxs->r->peri); | |
1285 | } | |
1286 | ||
1287 | return off; | |
1288 | } | |
1289 | ||
1290 | static int _bursts(unsigned dry_run, u8 buf[], | |
1291 | const struct _xfer_spec *pxs, int cyc) | |
1292 | { | |
1293 | int off = 0; | |
1294 | ||
1295 | switch (pxs->r->rqtype) { | |
1296 | case MEMTODEV: | |
1297 | off += _ldst_memtodev(dry_run, &buf[off], pxs, cyc); | |
1298 | break; | |
1299 | case DEVTOMEM: | |
1300 | off += _ldst_devtomem(dry_run, &buf[off], pxs, cyc); | |
1301 | break; | |
1302 | case MEMTOMEM: | |
1303 | off += _ldst_memtomem(dry_run, &buf[off], pxs, cyc); | |
1304 | break; | |
1305 | default: | |
1306 | off += 0x40000000; /* Scare off the Client */ | |
1307 | break; | |
1308 | } | |
1309 | ||
1310 | return off; | |
1311 | } | |
1312 | ||
1313 | /* Returns bytes consumed and updates bursts */ | |
1314 | static inline int _loop(unsigned dry_run, u8 buf[], | |
1315 | unsigned long *bursts, const struct _xfer_spec *pxs) | |
1316 | { | |
1317 | int cyc, cycmax, szlp, szlpend, szbrst, off; | |
1318 | unsigned lcnt0, lcnt1, ljmp0, ljmp1; | |
1319 | struct _arg_LPEND lpend; | |
1320 | ||
1321 | /* Max iterations possible in DMALP is 256 */ | |
1322 | if (*bursts >= 256*256) { | |
1323 | lcnt1 = 256; | |
1324 | lcnt0 = 256; | |
1325 | cyc = *bursts / lcnt1 / lcnt0; | |
1326 | } else if (*bursts > 256) { | |
1327 | lcnt1 = 256; | |
1328 | lcnt0 = *bursts / lcnt1; | |
1329 | cyc = 1; | |
1330 | } else { | |
1331 | lcnt1 = *bursts; | |
1332 | lcnt0 = 0; | |
1333 | cyc = 1; | |
1334 | } | |
1335 | ||
1336 | szlp = _emit_LP(1, buf, 0, 0); | |
1337 | szbrst = _bursts(1, buf, pxs, 1); | |
1338 | ||
1339 | lpend.cond = ALWAYS; | |
1340 | lpend.forever = false; | |
1341 | lpend.loop = 0; | |
1342 | lpend.bjump = 0; | |
1343 | szlpend = _emit_LPEND(1, buf, &lpend); | |
1344 | ||
1345 | if (lcnt0) { | |
1346 | szlp *= 2; | |
1347 | szlpend *= 2; | |
1348 | } | |
1349 | ||
1350 | /* | |
1351 | * Max bursts that we can unroll due to limit on the | |
1352 | * size of backward jump that can be encoded in DMALPEND | |
1353 | * which is 8-bits and hence 255 | |
1354 | */ | |
1355 | cycmax = (255 - (szlp + szlpend)) / szbrst; | |
1356 | ||
1357 | cyc = (cycmax < cyc) ? cycmax : cyc; | |
1358 | ||
1359 | off = 0; | |
1360 | ||
1361 | if (lcnt0) { | |
1362 | off += _emit_LP(dry_run, &buf[off], 0, lcnt0); | |
1363 | ljmp0 = off; | |
1364 | } | |
1365 | ||
1366 | off += _emit_LP(dry_run, &buf[off], 1, lcnt1); | |
1367 | ljmp1 = off; | |
1368 | ||
1369 | off += _bursts(dry_run, &buf[off], pxs, cyc); | |
1370 | ||
1371 | lpend.cond = ALWAYS; | |
1372 | lpend.forever = false; | |
1373 | lpend.loop = 1; | |
1374 | lpend.bjump = off - ljmp1; | |
1375 | off += _emit_LPEND(dry_run, &buf[off], &lpend); | |
1376 | ||
1377 | if (lcnt0) { | |
1378 | lpend.cond = ALWAYS; | |
1379 | lpend.forever = false; | |
1380 | lpend.loop = 0; | |
1381 | lpend.bjump = off - ljmp0; | |
1382 | off += _emit_LPEND(dry_run, &buf[off], &lpend); | |
1383 | } | |
1384 | ||
1385 | *bursts = lcnt1 * cyc; | |
1386 | if (lcnt0) | |
1387 | *bursts *= lcnt0; | |
1388 | ||
1389 | return off; | |
1390 | } | |
1391 | ||
1392 | static inline int _setup_loops(unsigned dry_run, u8 buf[], | |
1393 | const struct _xfer_spec *pxs) | |
1394 | { | |
1395 | struct pl330_xfer *x = pxs->x; | |
1396 | u32 ccr = pxs->ccr; | |
1397 | unsigned long c, bursts = BYTE_TO_BURST(x->bytes, ccr); | |
1398 | int off = 0; | |
1399 | ||
1400 | while (bursts) { | |
1401 | c = bursts; | |
1402 | off += _loop(dry_run, &buf[off], &c, pxs); | |
1403 | bursts -= c; | |
1404 | } | |
1405 | ||
1406 | return off; | |
1407 | } | |
1408 | ||
1409 | static inline int _setup_xfer(unsigned dry_run, u8 buf[], | |
1410 | const struct _xfer_spec *pxs) | |
1411 | { | |
1412 | struct pl330_xfer *x = pxs->x; | |
1413 | int off = 0; | |
1414 | ||
1415 | /* DMAMOV SAR, x->src_addr */ | |
1416 | off += _emit_MOV(dry_run, &buf[off], SAR, x->src_addr); | |
1417 | /* DMAMOV DAR, x->dst_addr */ | |
1418 | off += _emit_MOV(dry_run, &buf[off], DAR, x->dst_addr); | |
1419 | ||
1420 | /* Setup Loop(s) */ | |
1421 | off += _setup_loops(dry_run, &buf[off], pxs); | |
1422 | ||
1423 | return off; | |
1424 | } | |
1425 | ||
1426 | /* | |
1427 | * A req is a sequence of one or more xfer units. | |
1428 | * Returns the number of bytes taken to setup the MC for the req. | |
1429 | */ | |
1430 | static int _setup_req(unsigned dry_run, struct pl330_thread *thrd, | |
1431 | unsigned index, struct _xfer_spec *pxs) | |
1432 | { | |
1433 | struct _pl330_req *req = &thrd->req[index]; | |
1434 | struct pl330_xfer *x; | |
1435 | u8 *buf = req->mc_cpu; | |
1436 | int off = 0; | |
1437 | ||
1438 | PL330_DBGMC_START(req->mc_bus); | |
1439 | ||
1440 | /* DMAMOV CCR, ccr */ | |
1441 | off += _emit_MOV(dry_run, &buf[off], CCR, pxs->ccr); | |
1442 | ||
1443 | x = pxs->r->x; | |
1444 | do { | |
1445 | /* Error if xfer length is not aligned at burst size */ | |
1446 | if (x->bytes % (BRST_SIZE(pxs->ccr) * BRST_LEN(pxs->ccr))) | |
1447 | return -EINVAL; | |
1448 | ||
1449 | pxs->x = x; | |
1450 | off += _setup_xfer(dry_run, &buf[off], pxs); | |
1451 | ||
1452 | x = x->next; | |
1453 | } while (x); | |
1454 | ||
1455 | /* DMASEV peripheral/event */ | |
1456 | off += _emit_SEV(dry_run, &buf[off], thrd->ev); | |
1457 | /* DMAEND */ | |
1458 | off += _emit_END(dry_run, &buf[off]); | |
1459 | ||
1460 | return off; | |
1461 | } | |
1462 | ||
1463 | static inline u32 _prepare_ccr(const struct pl330_reqcfg *rqc) | |
1464 | { | |
1465 | u32 ccr = 0; | |
1466 | ||
1467 | if (rqc->src_inc) | |
1468 | ccr |= CC_SRCINC; | |
1469 | ||
1470 | if (rqc->dst_inc) | |
1471 | ccr |= CC_DSTINC; | |
1472 | ||
1473 | /* We set same protection levels for Src and DST for now */ | |
1474 | if (rqc->privileged) | |
1475 | ccr |= CC_SRCPRI | CC_DSTPRI; | |
1476 | if (rqc->nonsecure) | |
1477 | ccr |= CC_SRCNS | CC_DSTNS; | |
1478 | if (rqc->insnaccess) | |
1479 | ccr |= CC_SRCIA | CC_DSTIA; | |
1480 | ||
1481 | ccr |= (((rqc->brst_len - 1) & 0xf) << CC_SRCBRSTLEN_SHFT); | |
1482 | ccr |= (((rqc->brst_len - 1) & 0xf) << CC_DSTBRSTLEN_SHFT); | |
1483 | ||
1484 | ccr |= (rqc->brst_size << CC_SRCBRSTSIZE_SHFT); | |
1485 | ccr |= (rqc->brst_size << CC_DSTBRSTSIZE_SHFT); | |
1486 | ||
1487 | ccr |= (rqc->scctl << CC_SRCCCTRL_SHFT); | |
1488 | ccr |= (rqc->dcctl << CC_DSTCCTRL_SHFT); | |
1489 | ||
1490 | ccr |= (rqc->swap << CC_SWAP_SHFT); | |
1491 | ||
1492 | return ccr; | |
1493 | } | |
1494 | ||
1495 | static inline bool _is_valid(u32 ccr) | |
1496 | { | |
1497 | enum pl330_dstcachectrl dcctl; | |
1498 | enum pl330_srccachectrl scctl; | |
1499 | ||
1500 | dcctl = (ccr >> CC_DSTCCTRL_SHFT) & CC_DRCCCTRL_MASK; | |
1501 | scctl = (ccr >> CC_SRCCCTRL_SHFT) & CC_SRCCCTRL_MASK; | |
1502 | ||
1503 | if (dcctl == DINVALID1 || dcctl == DINVALID2 | |
1504 | || scctl == SINVALID1 || scctl == SINVALID2) | |
1505 | return false; | |
1506 | else | |
1507 | return true; | |
1508 | } | |
1509 | ||
1510 | /* | |
1511 | * Submit a list of xfers after which the client wants notification. | |
1512 | * Client is not notified after each xfer unit, just once after all | |
1513 | * xfer units are done or some error occurs. | |
1514 | */ | |
1515 | static int pl330_submit_req(void *ch_id, struct pl330_req *r) | |
1516 | { | |
1517 | struct pl330_thread *thrd = ch_id; | |
1518 | struct pl330_dmac *pl330; | |
1519 | struct pl330_info *pi; | |
1520 | struct _xfer_spec xs; | |
1521 | unsigned long flags; | |
1522 | void __iomem *regs; | |
1523 | unsigned idx; | |
1524 | u32 ccr; | |
1525 | int ret = 0; | |
1526 | ||
1527 | /* No Req or Unacquired Channel or DMAC */ | |
1528 | if (!r || !thrd || thrd->free) | |
1529 | return -EINVAL; | |
1530 | ||
1531 | pl330 = thrd->dmac; | |
1532 | pi = pl330->pinfo; | |
1533 | regs = pi->base; | |
1534 | ||
1535 | if (pl330->state == DYING | |
1536 | || pl330->dmac_tbd.reset_chan & (1 << thrd->id)) { | |
1537 | dev_info(thrd->dmac->pinfo->dev, "%s:%d\n", | |
1538 | __func__, __LINE__); | |
1539 | return -EAGAIN; | |
1540 | } | |
1541 | ||
1542 | /* If request for non-existing peripheral */ | |
1543 | if (r->rqtype != MEMTOMEM && r->peri >= pi->pcfg.num_peri) { | |
1544 | dev_info(thrd->dmac->pinfo->dev, | |
1545 | "%s:%d Invalid peripheral(%u)!\n", | |
1546 | __func__, __LINE__, r->peri); | |
1547 | return -EINVAL; | |
1548 | } | |
1549 | ||
1550 | spin_lock_irqsave(&pl330->lock, flags); | |
1551 | ||
1552 | if (_queue_full(thrd)) { | |
1553 | ret = -EAGAIN; | |
1554 | goto xfer_exit; | |
1555 | } | |
1556 | ||
b7d861d9 BK |
1557 | |
1558 | /* Use last settings, if not provided */ | |
2e2c682b SK |
1559 | if (r->cfg) { |
1560 | /* Prefer Secure Channel */ | |
1561 | if (!_manager_ns(thrd)) | |
1562 | r->cfg->nonsecure = 0; | |
1563 | else | |
1564 | r->cfg->nonsecure = 1; | |
1565 | ||
b7d861d9 | 1566 | ccr = _prepare_ccr(r->cfg); |
2e2c682b | 1567 | } else { |
b7d861d9 | 1568 | ccr = readl(regs + CC(thrd->id)); |
2e2c682b | 1569 | } |
b7d861d9 BK |
1570 | |
1571 | /* If this req doesn't have valid xfer settings */ | |
1572 | if (!_is_valid(ccr)) { | |
1573 | ret = -EINVAL; | |
1574 | dev_info(thrd->dmac->pinfo->dev, "%s:%d Invalid CCR(%x)!\n", | |
1575 | __func__, __LINE__, ccr); | |
1576 | goto xfer_exit; | |
1577 | } | |
1578 | ||
1579 | idx = IS_FREE(&thrd->req[0]) ? 0 : 1; | |
1580 | ||
1581 | xs.ccr = ccr; | |
1582 | xs.r = r; | |
1583 | ||
1584 | /* First dry run to check if req is acceptable */ | |
1585 | ret = _setup_req(1, thrd, idx, &xs); | |
1586 | if (ret < 0) | |
1587 | goto xfer_exit; | |
1588 | ||
1589 | if (ret > pi->mcbufsz / 2) { | |
1590 | dev_info(thrd->dmac->pinfo->dev, | |
1591 | "%s:%d Trying increasing mcbufsz\n", | |
1592 | __func__, __LINE__); | |
1593 | ret = -ENOMEM; | |
1594 | goto xfer_exit; | |
1595 | } | |
1596 | ||
1597 | /* Hook the request */ | |
1598 | thrd->lstenq = idx; | |
1599 | thrd->req[idx].mc_len = _setup_req(0, thrd, idx, &xs); | |
1600 | thrd->req[idx].r = r; | |
1601 | ||
1602 | ret = 0; | |
1603 | ||
1604 | xfer_exit: | |
1605 | spin_unlock_irqrestore(&pl330->lock, flags); | |
1606 | ||
1607 | return ret; | |
1608 | } | |
1609 | ||
1610 | static void pl330_dotask(unsigned long data) | |
1611 | { | |
1612 | struct pl330_dmac *pl330 = (struct pl330_dmac *) data; | |
1613 | struct pl330_info *pi = pl330->pinfo; | |
1614 | unsigned long flags; | |
1615 | int i; | |
1616 | ||
1617 | spin_lock_irqsave(&pl330->lock, flags); | |
1618 | ||
1619 | /* The DMAC itself gone nuts */ | |
1620 | if (pl330->dmac_tbd.reset_dmac) { | |
1621 | pl330->state = DYING; | |
1622 | /* Reset the manager too */ | |
1623 | pl330->dmac_tbd.reset_mngr = true; | |
1624 | /* Clear the reset flag */ | |
1625 | pl330->dmac_tbd.reset_dmac = false; | |
1626 | } | |
1627 | ||
1628 | if (pl330->dmac_tbd.reset_mngr) { | |
1629 | _stop(pl330->manager); | |
1630 | /* Reset all channels */ | |
1631 | pl330->dmac_tbd.reset_chan = (1 << pi->pcfg.num_chan) - 1; | |
1632 | /* Clear the reset flag */ | |
1633 | pl330->dmac_tbd.reset_mngr = false; | |
1634 | } | |
1635 | ||
1636 | for (i = 0; i < pi->pcfg.num_chan; i++) { | |
1637 | ||
1638 | if (pl330->dmac_tbd.reset_chan & (1 << i)) { | |
1639 | struct pl330_thread *thrd = &pl330->channels[i]; | |
1640 | void __iomem *regs = pi->base; | |
1641 | enum pl330_op_err err; | |
1642 | ||
1643 | _stop(thrd); | |
1644 | ||
1645 | if (readl(regs + FSC) & (1 << thrd->id)) | |
1646 | err = PL330_ERR_FAIL; | |
1647 | else | |
1648 | err = PL330_ERR_ABORT; | |
1649 | ||
1650 | spin_unlock_irqrestore(&pl330->lock, flags); | |
1651 | ||
1652 | _callback(thrd->req[1 - thrd->lstenq].r, err); | |
1653 | _callback(thrd->req[thrd->lstenq].r, err); | |
1654 | ||
1655 | spin_lock_irqsave(&pl330->lock, flags); | |
1656 | ||
1657 | thrd->req[0].r = NULL; | |
1658 | thrd->req[1].r = NULL; | |
1659 | mark_free(thrd, 0); | |
1660 | mark_free(thrd, 1); | |
1661 | ||
1662 | /* Clear the reset flag */ | |
1663 | pl330->dmac_tbd.reset_chan &= ~(1 << i); | |
1664 | } | |
1665 | } | |
1666 | ||
1667 | spin_unlock_irqrestore(&pl330->lock, flags); | |
1668 | ||
1669 | return; | |
1670 | } | |
1671 | ||
1672 | /* Returns 1 if state was updated, 0 otherwise */ | |
1673 | static int pl330_update(const struct pl330_info *pi) | |
1674 | { | |
fdec53d5 | 1675 | struct pl330_req *rqdone, *tmp; |
b7d861d9 BK |
1676 | struct pl330_dmac *pl330; |
1677 | unsigned long flags; | |
1678 | void __iomem *regs; | |
1679 | u32 val; | |
1680 | int id, ev, ret = 0; | |
1681 | ||
1682 | if (!pi || !pi->pl330_data) | |
1683 | return 0; | |
1684 | ||
1685 | regs = pi->base; | |
1686 | pl330 = pi->pl330_data; | |
1687 | ||
1688 | spin_lock_irqsave(&pl330->lock, flags); | |
1689 | ||
1690 | val = readl(regs + FSM) & 0x1; | |
1691 | if (val) | |
1692 | pl330->dmac_tbd.reset_mngr = true; | |
1693 | else | |
1694 | pl330->dmac_tbd.reset_mngr = false; | |
1695 | ||
1696 | val = readl(regs + FSC) & ((1 << pi->pcfg.num_chan) - 1); | |
1697 | pl330->dmac_tbd.reset_chan |= val; | |
1698 | if (val) { | |
1699 | int i = 0; | |
1700 | while (i < pi->pcfg.num_chan) { | |
1701 | if (val & (1 << i)) { | |
1702 | dev_info(pi->dev, | |
1703 | "Reset Channel-%d\t CS-%x FTC-%x\n", | |
1704 | i, readl(regs + CS(i)), | |
1705 | readl(regs + FTC(i))); | |
1706 | _stop(&pl330->channels[i]); | |
1707 | } | |
1708 | i++; | |
1709 | } | |
1710 | } | |
1711 | ||
1712 | /* Check which event happened i.e, thread notified */ | |
1713 | val = readl(regs + ES); | |
1714 | if (pi->pcfg.num_events < 32 | |
1715 | && val & ~((1 << pi->pcfg.num_events) - 1)) { | |
1716 | pl330->dmac_tbd.reset_dmac = true; | |
1717 | dev_err(pi->dev, "%s:%d Unexpected!\n", __func__, __LINE__); | |
1718 | ret = 1; | |
1719 | goto updt_exit; | |
1720 | } | |
1721 | ||
1722 | for (ev = 0; ev < pi->pcfg.num_events; ev++) { | |
1723 | if (val & (1 << ev)) { /* Event occurred */ | |
1724 | struct pl330_thread *thrd; | |
1725 | u32 inten = readl(regs + INTEN); | |
1726 | int active; | |
1727 | ||
1728 | /* Clear the event */ | |
1729 | if (inten & (1 << ev)) | |
1730 | writel(1 << ev, regs + INTCLR); | |
1731 | ||
1732 | ret = 1; | |
1733 | ||
1734 | id = pl330->events[ev]; | |
1735 | ||
1736 | thrd = &pl330->channels[id]; | |
1737 | ||
1738 | active = thrd->req_running; | |
1739 | if (active == -1) /* Aborted */ | |
1740 | continue; | |
1741 | ||
fdec53d5 JM |
1742 | /* Detach the req */ |
1743 | rqdone = thrd->req[active].r; | |
1744 | thrd->req[active].r = NULL; | |
1745 | ||
b7d861d9 BK |
1746 | mark_free(thrd, active); |
1747 | ||
1748 | /* Get going again ASAP */ | |
1749 | _start(thrd); | |
1750 | ||
1751 | /* For now, just make a list of callbacks to be done */ | |
1752 | list_add_tail(&rqdone->rqd, &pl330->req_done); | |
1753 | } | |
1754 | } | |
1755 | ||
1756 | /* Now that we are in no hurry, do the callbacks */ | |
fdec53d5 JM |
1757 | list_for_each_entry_safe(rqdone, tmp, &pl330->req_done, rqd) { |
1758 | list_del(&rqdone->rqd); | |
b7d861d9 BK |
1759 | |
1760 | spin_unlock_irqrestore(&pl330->lock, flags); | |
fdec53d5 | 1761 | _callback(rqdone, PL330_ERR_NONE); |
b7d861d9 BK |
1762 | spin_lock_irqsave(&pl330->lock, flags); |
1763 | } | |
1764 | ||
1765 | updt_exit: | |
1766 | spin_unlock_irqrestore(&pl330->lock, flags); | |
1767 | ||
1768 | if (pl330->dmac_tbd.reset_dmac | |
1769 | || pl330->dmac_tbd.reset_mngr | |
1770 | || pl330->dmac_tbd.reset_chan) { | |
1771 | ret = 1; | |
1772 | tasklet_schedule(&pl330->tasks); | |
1773 | } | |
1774 | ||
1775 | return ret; | |
1776 | } | |
1777 | ||
1778 | static int pl330_chan_ctrl(void *ch_id, enum pl330_chan_op op) | |
1779 | { | |
1780 | struct pl330_thread *thrd = ch_id; | |
1781 | struct pl330_dmac *pl330; | |
1782 | unsigned long flags; | |
ef08e782 | 1783 | int ret = 0, active; |
b7d861d9 BK |
1784 | |
1785 | if (!thrd || thrd->free || thrd->dmac->state == DYING) | |
1786 | return -EINVAL; | |
1787 | ||
1788 | pl330 = thrd->dmac; | |
ef08e782 | 1789 | active = thrd->req_running; |
b7d861d9 BK |
1790 | |
1791 | spin_lock_irqsave(&pl330->lock, flags); | |
1792 | ||
1793 | switch (op) { | |
1794 | case PL330_OP_FLUSH: | |
1795 | /* Make sure the channel is stopped */ | |
1796 | _stop(thrd); | |
1797 | ||
1798 | thrd->req[0].r = NULL; | |
1799 | thrd->req[1].r = NULL; | |
1800 | mark_free(thrd, 0); | |
1801 | mark_free(thrd, 1); | |
1802 | break; | |
1803 | ||
1804 | case PL330_OP_ABORT: | |
1805 | /* Make sure the channel is stopped */ | |
1806 | _stop(thrd); | |
1807 | ||
1808 | /* ABORT is only for the active req */ | |
1809 | if (active == -1) | |
1810 | break; | |
1811 | ||
1812 | thrd->req[active].r = NULL; | |
1813 | mark_free(thrd, active); | |
1814 | ||
1815 | /* Start the next */ | |
1816 | case PL330_OP_START: | |
1817 | if ((active == -1) && !_start(thrd)) | |
1818 | ret = -EIO; | |
1819 | break; | |
1820 | ||
1821 | default: | |
1822 | ret = -EINVAL; | |
1823 | } | |
1824 | ||
1825 | spin_unlock_irqrestore(&pl330->lock, flags); | |
1826 | return ret; | |
1827 | } | |
1828 | ||
b7d861d9 BK |
1829 | /* Reserve an event */ |
1830 | static inline int _alloc_event(struct pl330_thread *thrd) | |
1831 | { | |
1832 | struct pl330_dmac *pl330 = thrd->dmac; | |
1833 | struct pl330_info *pi = pl330->pinfo; | |
1834 | int ev; | |
1835 | ||
1836 | for (ev = 0; ev < pi->pcfg.num_events; ev++) | |
1837 | if (pl330->events[ev] == -1) { | |
1838 | pl330->events[ev] = thrd->id; | |
1839 | return ev; | |
1840 | } | |
1841 | ||
1842 | return -1; | |
1843 | } | |
1844 | ||
1845 | static bool _chan_ns(const struct pl330_info *pi, int i) | |
1846 | { | |
1847 | return pi->pcfg.irq_ns & (1 << i); | |
1848 | } | |
1849 | ||
1850 | /* Upon success, returns IdentityToken for the | |
1851 | * allocated channel, NULL otherwise. | |
1852 | */ | |
1853 | static void *pl330_request_channel(const struct pl330_info *pi) | |
1854 | { | |
1855 | struct pl330_thread *thrd = NULL; | |
1856 | struct pl330_dmac *pl330; | |
1857 | unsigned long flags; | |
1858 | int chans, i; | |
1859 | ||
1860 | if (!pi || !pi->pl330_data) | |
1861 | return NULL; | |
b3040e40 | 1862 | |
b7d861d9 BK |
1863 | pl330 = pi->pl330_data; |
1864 | ||
1865 | if (pl330->state == DYING) | |
1866 | return NULL; | |
1867 | ||
1868 | chans = pi->pcfg.num_chan; | |
1869 | ||
1870 | spin_lock_irqsave(&pl330->lock, flags); | |
1871 | ||
1872 | for (i = 0; i < chans; i++) { | |
1873 | thrd = &pl330->channels[i]; | |
1874 | if ((thrd->free) && (!_manager_ns(thrd) || | |
1875 | _chan_ns(pi, i))) { | |
1876 | thrd->ev = _alloc_event(thrd); | |
1877 | if (thrd->ev >= 0) { | |
1878 | thrd->free = false; | |
1879 | thrd->lstenq = 1; | |
1880 | thrd->req[0].r = NULL; | |
1881 | mark_free(thrd, 0); | |
1882 | thrd->req[1].r = NULL; | |
1883 | mark_free(thrd, 1); | |
1884 | break; | |
1885 | } | |
1886 | } | |
1887 | thrd = NULL; | |
1888 | } | |
1889 | ||
1890 | spin_unlock_irqrestore(&pl330->lock, flags); | |
1891 | ||
1892 | return thrd; | |
1893 | } | |
1894 | ||
1895 | /* Release an event */ | |
1896 | static inline void _free_event(struct pl330_thread *thrd, int ev) | |
1897 | { | |
1898 | struct pl330_dmac *pl330 = thrd->dmac; | |
1899 | struct pl330_info *pi = pl330->pinfo; | |
1900 | ||
1901 | /* If the event is valid and was held by the thread */ | |
1902 | if (ev >= 0 && ev < pi->pcfg.num_events | |
1903 | && pl330->events[ev] == thrd->id) | |
1904 | pl330->events[ev] = -1; | |
1905 | } | |
1906 | ||
1907 | static void pl330_release_channel(void *ch_id) | |
1908 | { | |
1909 | struct pl330_thread *thrd = ch_id; | |
1910 | struct pl330_dmac *pl330; | |
1911 | unsigned long flags; | |
1912 | ||
1913 | if (!thrd || thrd->free) | |
1914 | return; | |
1915 | ||
1916 | _stop(thrd); | |
1917 | ||
1918 | _callback(thrd->req[1 - thrd->lstenq].r, PL330_ERR_ABORT); | |
1919 | _callback(thrd->req[thrd->lstenq].r, PL330_ERR_ABORT); | |
1920 | ||
1921 | pl330 = thrd->dmac; | |
1922 | ||
1923 | spin_lock_irqsave(&pl330->lock, flags); | |
1924 | _free_event(thrd, thrd->ev); | |
1925 | thrd->free = true; | |
1926 | spin_unlock_irqrestore(&pl330->lock, flags); | |
1927 | } | |
1928 | ||
1929 | /* Initialize the structure for PL330 configuration, that can be used | |
1930 | * by the client driver the make best use of the DMAC | |
1931 | */ | |
1932 | static void read_dmac_config(struct pl330_info *pi) | |
1933 | { | |
1934 | void __iomem *regs = pi->base; | |
1935 | u32 val; | |
1936 | ||
1937 | val = readl(regs + CRD) >> CRD_DATA_WIDTH_SHIFT; | |
1938 | val &= CRD_DATA_WIDTH_MASK; | |
1939 | pi->pcfg.data_bus_width = 8 * (1 << val); | |
1940 | ||
1941 | val = readl(regs + CRD) >> CRD_DATA_BUFF_SHIFT; | |
1942 | val &= CRD_DATA_BUFF_MASK; | |
1943 | pi->pcfg.data_buf_dep = val + 1; | |
1944 | ||
1945 | val = readl(regs + CR0) >> CR0_NUM_CHANS_SHIFT; | |
1946 | val &= CR0_NUM_CHANS_MASK; | |
1947 | val += 1; | |
1948 | pi->pcfg.num_chan = val; | |
1949 | ||
1950 | val = readl(regs + CR0); | |
1951 | if (val & CR0_PERIPH_REQ_SET) { | |
1952 | val = (val >> CR0_NUM_PERIPH_SHIFT) & CR0_NUM_PERIPH_MASK; | |
1953 | val += 1; | |
1954 | pi->pcfg.num_peri = val; | |
1955 | pi->pcfg.peri_ns = readl(regs + CR4); | |
1956 | } else { | |
1957 | pi->pcfg.num_peri = 0; | |
1958 | } | |
1959 | ||
1960 | val = readl(regs + CR0); | |
1961 | if (val & CR0_BOOT_MAN_NS) | |
1962 | pi->pcfg.mode |= DMAC_MODE_NS; | |
1963 | else | |
1964 | pi->pcfg.mode &= ~DMAC_MODE_NS; | |
1965 | ||
1966 | val = readl(regs + CR0) >> CR0_NUM_EVENTS_SHIFT; | |
1967 | val &= CR0_NUM_EVENTS_MASK; | |
1968 | val += 1; | |
1969 | pi->pcfg.num_events = val; | |
1970 | ||
1971 | pi->pcfg.irq_ns = readl(regs + CR3); | |
b7d861d9 BK |
1972 | } |
1973 | ||
1974 | static inline void _reset_thread(struct pl330_thread *thrd) | |
1975 | { | |
1976 | struct pl330_dmac *pl330 = thrd->dmac; | |
1977 | struct pl330_info *pi = pl330->pinfo; | |
1978 | ||
1979 | thrd->req[0].mc_cpu = pl330->mcode_cpu | |
1980 | + (thrd->id * pi->mcbufsz); | |
1981 | thrd->req[0].mc_bus = pl330->mcode_bus | |
1982 | + (thrd->id * pi->mcbufsz); | |
1983 | thrd->req[0].r = NULL; | |
1984 | mark_free(thrd, 0); | |
1985 | ||
1986 | thrd->req[1].mc_cpu = thrd->req[0].mc_cpu | |
1987 | + pi->mcbufsz / 2; | |
1988 | thrd->req[1].mc_bus = thrd->req[0].mc_bus | |
1989 | + pi->mcbufsz / 2; | |
1990 | thrd->req[1].r = NULL; | |
1991 | mark_free(thrd, 1); | |
1992 | } | |
1993 | ||
1994 | static int dmac_alloc_threads(struct pl330_dmac *pl330) | |
1995 | { | |
1996 | struct pl330_info *pi = pl330->pinfo; | |
1997 | int chans = pi->pcfg.num_chan; | |
1998 | struct pl330_thread *thrd; | |
1999 | int i; | |
2000 | ||
2001 | /* Allocate 1 Manager and 'chans' Channel threads */ | |
2002 | pl330->channels = kzalloc((1 + chans) * sizeof(*thrd), | |
2003 | GFP_KERNEL); | |
2004 | if (!pl330->channels) | |
2005 | return -ENOMEM; | |
2006 | ||
2007 | /* Init Channel threads */ | |
2008 | for (i = 0; i < chans; i++) { | |
2009 | thrd = &pl330->channels[i]; | |
2010 | thrd->id = i; | |
2011 | thrd->dmac = pl330; | |
2012 | _reset_thread(thrd); | |
2013 | thrd->free = true; | |
2014 | } | |
2015 | ||
2016 | /* MANAGER is indexed at the end */ | |
2017 | thrd = &pl330->channels[chans]; | |
2018 | thrd->id = chans; | |
2019 | thrd->dmac = pl330; | |
2020 | thrd->free = false; | |
2021 | pl330->manager = thrd; | |
2022 | ||
2023 | return 0; | |
2024 | } | |
2025 | ||
2026 | static int dmac_alloc_resources(struct pl330_dmac *pl330) | |
2027 | { | |
2028 | struct pl330_info *pi = pl330->pinfo; | |
2029 | int chans = pi->pcfg.num_chan; | |
2030 | int ret; | |
b3040e40 | 2031 | |
b3040e40 | 2032 | /* |
b7d861d9 BK |
2033 | * Alloc MicroCode buffer for 'chans' Channel threads. |
2034 | * A channel's buffer offset is (Channel_Id * MCODE_BUFF_PERCHAN) | |
b3040e40 | 2035 | */ |
b7d861d9 BK |
2036 | pl330->mcode_cpu = dma_alloc_coherent(pi->dev, |
2037 | chans * pi->mcbufsz, | |
2038 | &pl330->mcode_bus, GFP_KERNEL); | |
2039 | if (!pl330->mcode_cpu) { | |
2040 | dev_err(pi->dev, "%s:%d Can't allocate memory!\n", | |
2041 | __func__, __LINE__); | |
2042 | return -ENOMEM; | |
2043 | } | |
2044 | ||
2045 | ret = dmac_alloc_threads(pl330); | |
2046 | if (ret) { | |
2047 | dev_err(pi->dev, "%s:%d Can't to create channels for DMAC!\n", | |
2048 | __func__, __LINE__); | |
2049 | dma_free_coherent(pi->dev, | |
2050 | chans * pi->mcbufsz, | |
2051 | pl330->mcode_cpu, pl330->mcode_bus); | |
2052 | return ret; | |
2053 | } | |
2054 | ||
2055 | return 0; | |
2056 | } | |
2057 | ||
2058 | static int pl330_add(struct pl330_info *pi) | |
2059 | { | |
2060 | struct pl330_dmac *pl330; | |
2061 | void __iomem *regs; | |
2062 | int i, ret; | |
2063 | ||
2064 | if (!pi || !pi->dev) | |
2065 | return -EINVAL; | |
2066 | ||
2067 | /* If already added */ | |
2068 | if (pi->pl330_data) | |
2069 | return -EINVAL; | |
2070 | ||
b3040e40 | 2071 | /* |
b7d861d9 BK |
2072 | * If the SoC can perform reset on the DMAC, then do it |
2073 | * before reading its configuration. | |
b3040e40 | 2074 | */ |
b7d861d9 BK |
2075 | if (pi->dmac_reset) |
2076 | pi->dmac_reset(pi); | |
b3040e40 | 2077 | |
b7d861d9 | 2078 | regs = pi->base; |
b3040e40 | 2079 | |
b7d861d9 | 2080 | /* Check if we can handle this DMAC */ |
09677176 WD |
2081 | if ((pi->pcfg.periph_id & 0xfffff) != PERIPH_ID_VAL) { |
2082 | dev_err(pi->dev, "PERIPH_ID 0x%x !\n", pi->pcfg.periph_id); | |
b7d861d9 BK |
2083 | return -EINVAL; |
2084 | } | |
b3040e40 | 2085 | |
b7d861d9 BK |
2086 | /* Read the configuration of the DMAC */ |
2087 | read_dmac_config(pi); | |
b3040e40 | 2088 | |
b7d861d9 BK |
2089 | if (pi->pcfg.num_events == 0) { |
2090 | dev_err(pi->dev, "%s:%d Can't work without events!\n", | |
2091 | __func__, __LINE__); | |
2092 | return -EINVAL; | |
2093 | } | |
b3040e40 | 2094 | |
b7d861d9 BK |
2095 | pl330 = kzalloc(sizeof(*pl330), GFP_KERNEL); |
2096 | if (!pl330) { | |
2097 | dev_err(pi->dev, "%s:%d Can't allocate memory!\n", | |
2098 | __func__, __LINE__); | |
2099 | return -ENOMEM; | |
2100 | } | |
b3040e40 | 2101 | |
b7d861d9 BK |
2102 | /* Assign the info structure and private data */ |
2103 | pl330->pinfo = pi; | |
2104 | pi->pl330_data = pl330; | |
b3040e40 | 2105 | |
b7d861d9 | 2106 | spin_lock_init(&pl330->lock); |
1b9bb715 | 2107 | |
b7d861d9 | 2108 | INIT_LIST_HEAD(&pl330->req_done); |
42bc9cf4 | 2109 | |
b7d861d9 BK |
2110 | /* Use default MC buffer size if not provided */ |
2111 | if (!pi->mcbufsz) | |
2112 | pi->mcbufsz = MCODE_BUFF_PER_REQ * 2; | |
b3040e40 | 2113 | |
b7d861d9 BK |
2114 | /* Mark all events as free */ |
2115 | for (i = 0; i < pi->pcfg.num_events; i++) | |
2116 | pl330->events[i] = -1; | |
b3040e40 | 2117 | |
b7d861d9 BK |
2118 | /* Allocate resources needed by the DMAC */ |
2119 | ret = dmac_alloc_resources(pl330); | |
2120 | if (ret) { | |
2121 | dev_err(pi->dev, "Unable to create channels for DMAC\n"); | |
2122 | kfree(pl330); | |
2123 | return ret; | |
2124 | } | |
b3040e40 | 2125 | |
b7d861d9 | 2126 | tasklet_init(&pl330->tasks, pl330_dotask, (unsigned long) pl330); |
b3040e40 | 2127 | |
b7d861d9 | 2128 | pl330->state = INIT; |
a2f5203f | 2129 | |
b7d861d9 BK |
2130 | return 0; |
2131 | } | |
b3040e40 | 2132 | |
b7d861d9 BK |
2133 | static int dmac_free_threads(struct pl330_dmac *pl330) |
2134 | { | |
2135 | struct pl330_info *pi = pl330->pinfo; | |
2136 | int chans = pi->pcfg.num_chan; | |
2137 | struct pl330_thread *thrd; | |
2138 | int i; | |
b3040e40 | 2139 | |
b7d861d9 BK |
2140 | /* Release Channel threads */ |
2141 | for (i = 0; i < chans; i++) { | |
2142 | thrd = &pl330->channels[i]; | |
2143 | pl330_release_channel((void *)thrd); | |
2144 | } | |
b3040e40 | 2145 | |
b7d861d9 BK |
2146 | /* Free memory */ |
2147 | kfree(pl330->channels); | |
b3040e40 | 2148 | |
b7d861d9 BK |
2149 | return 0; |
2150 | } | |
b3040e40 | 2151 | |
b7d861d9 BK |
2152 | static void dmac_free_resources(struct pl330_dmac *pl330) |
2153 | { | |
2154 | struct pl330_info *pi = pl330->pinfo; | |
2155 | int chans = pi->pcfg.num_chan; | |
b3040e40 | 2156 | |
b7d861d9 BK |
2157 | dmac_free_threads(pl330); |
2158 | ||
2159 | dma_free_coherent(pi->dev, chans * pi->mcbufsz, | |
2160 | pl330->mcode_cpu, pl330->mcode_bus); | |
2161 | } | |
2162 | ||
2163 | static void pl330_del(struct pl330_info *pi) | |
2164 | { | |
2165 | struct pl330_dmac *pl330; | |
2166 | ||
2167 | if (!pi || !pi->pl330_data) | |
2168 | return; | |
2169 | ||
2170 | pl330 = pi->pl330_data; | |
2171 | ||
2172 | pl330->state = UNINIT; | |
2173 | ||
2174 | tasklet_kill(&pl330->tasks); | |
2175 | ||
2176 | /* Free DMAC resources */ | |
2177 | dmac_free_resources(pl330); | |
2178 | ||
2179 | kfree(pl330); | |
2180 | pi->pl330_data = NULL; | |
2181 | } | |
b3040e40 | 2182 | |
3e2ec13a TA |
2183 | /* forward declaration */ |
2184 | static struct amba_driver pl330_driver; | |
2185 | ||
b3040e40 JB |
2186 | static inline struct dma_pl330_chan * |
2187 | to_pchan(struct dma_chan *ch) | |
2188 | { | |
2189 | if (!ch) | |
2190 | return NULL; | |
2191 | ||
2192 | return container_of(ch, struct dma_pl330_chan, chan); | |
2193 | } | |
2194 | ||
2195 | static inline struct dma_pl330_desc * | |
2196 | to_desc(struct dma_async_tx_descriptor *tx) | |
2197 | { | |
2198 | return container_of(tx, struct dma_pl330_desc, txd); | |
2199 | } | |
2200 | ||
2201 | static inline void free_desc_list(struct list_head *list) | |
2202 | { | |
2203 | struct dma_pl330_dmac *pdmac; | |
2204 | struct dma_pl330_desc *desc; | |
c8473828 | 2205 | struct dma_pl330_chan *pch = NULL; |
b3040e40 JB |
2206 | unsigned long flags; |
2207 | ||
b3040e40 JB |
2208 | /* Finish off the work list */ |
2209 | list_for_each_entry(desc, list, node) { | |
2210 | dma_async_tx_callback callback; | |
2211 | void *param; | |
2212 | ||
2213 | /* All desc in a list belong to same channel */ | |
2214 | pch = desc->pchan; | |
2215 | callback = desc->txd.callback; | |
2216 | param = desc->txd.callback_param; | |
2217 | ||
2218 | if (callback) | |
2219 | callback(param); | |
2220 | ||
2221 | desc->pchan = NULL; | |
2222 | } | |
2223 | ||
c8473828 OJ |
2224 | /* pch will be unset if list was empty */ |
2225 | if (!pch) | |
2226 | return; | |
2227 | ||
b3040e40 JB |
2228 | pdmac = pch->dmac; |
2229 | ||
2230 | spin_lock_irqsave(&pdmac->pool_lock, flags); | |
2231 | list_splice_tail_init(list, &pdmac->desc_pool); | |
2232 | spin_unlock_irqrestore(&pdmac->pool_lock, flags); | |
2233 | } | |
2234 | ||
42bc9cf4 BK |
2235 | static inline void handle_cyclic_desc_list(struct list_head *list) |
2236 | { | |
2237 | struct dma_pl330_desc *desc; | |
c8473828 | 2238 | struct dma_pl330_chan *pch = NULL; |
42bc9cf4 BK |
2239 | unsigned long flags; |
2240 | ||
42bc9cf4 BK |
2241 | list_for_each_entry(desc, list, node) { |
2242 | dma_async_tx_callback callback; | |
2243 | ||
2244 | /* Change status to reload it */ | |
2245 | desc->status = PREP; | |
2246 | pch = desc->pchan; | |
2247 | callback = desc->txd.callback; | |
2248 | if (callback) | |
2249 | callback(desc->txd.callback_param); | |
2250 | } | |
2251 | ||
c8473828 OJ |
2252 | /* pch will be unset if list was empty */ |
2253 | if (!pch) | |
2254 | return; | |
2255 | ||
42bc9cf4 BK |
2256 | spin_lock_irqsave(&pch->lock, flags); |
2257 | list_splice_tail_init(list, &pch->work_list); | |
2258 | spin_unlock_irqrestore(&pch->lock, flags); | |
2259 | } | |
2260 | ||
b3040e40 JB |
2261 | static inline void fill_queue(struct dma_pl330_chan *pch) |
2262 | { | |
2263 | struct dma_pl330_desc *desc; | |
2264 | int ret; | |
2265 | ||
2266 | list_for_each_entry(desc, &pch->work_list, node) { | |
2267 | ||
2268 | /* If already submitted */ | |
2269 | if (desc->status == BUSY) | |
30fb980b | 2270 | continue; |
b3040e40 JB |
2271 | |
2272 | ret = pl330_submit_req(pch->pl330_chid, | |
2273 | &desc->req); | |
2274 | if (!ret) { | |
2275 | desc->status = BUSY; | |
b3040e40 JB |
2276 | } else if (ret == -EAGAIN) { |
2277 | /* QFull or DMAC Dying */ | |
2278 | break; | |
2279 | } else { | |
2280 | /* Unacceptable request */ | |
2281 | desc->status = DONE; | |
2282 | dev_err(pch->dmac->pif.dev, "%s:%d Bad Desc(%d)\n", | |
2283 | __func__, __LINE__, desc->txd.cookie); | |
2284 | tasklet_schedule(&pch->task); | |
2285 | } | |
2286 | } | |
2287 | } | |
2288 | ||
2289 | static void pl330_tasklet(unsigned long data) | |
2290 | { | |
2291 | struct dma_pl330_chan *pch = (struct dma_pl330_chan *)data; | |
2292 | struct dma_pl330_desc *desc, *_dt; | |
2293 | unsigned long flags; | |
2294 | LIST_HEAD(list); | |
2295 | ||
2296 | spin_lock_irqsave(&pch->lock, flags); | |
2297 | ||
2298 | /* Pick up ripe tomatoes */ | |
2299 | list_for_each_entry_safe(desc, _dt, &pch->work_list, node) | |
2300 | if (desc->status == DONE) { | |
30c1dc0f | 2301 | if (!pch->cyclic) |
eab21585 | 2302 | dma_cookie_complete(&desc->txd); |
b3040e40 JB |
2303 | list_move_tail(&desc->node, &list); |
2304 | } | |
2305 | ||
2306 | /* Try to submit a req imm. next to the last completed cookie */ | |
2307 | fill_queue(pch); | |
2308 | ||
2309 | /* Make sure the PL330 Channel thread is active */ | |
2310 | pl330_chan_ctrl(pch->pl330_chid, PL330_OP_START); | |
2311 | ||
2312 | spin_unlock_irqrestore(&pch->lock, flags); | |
2313 | ||
42bc9cf4 BK |
2314 | if (pch->cyclic) |
2315 | handle_cyclic_desc_list(&list); | |
2316 | else | |
2317 | free_desc_list(&list); | |
b3040e40 JB |
2318 | } |
2319 | ||
2320 | static void dma_pl330_rqcb(void *token, enum pl330_op_err err) | |
2321 | { | |
2322 | struct dma_pl330_desc *desc = token; | |
2323 | struct dma_pl330_chan *pch = desc->pchan; | |
2324 | unsigned long flags; | |
2325 | ||
2326 | /* If desc aborted */ | |
2327 | if (!pch) | |
2328 | return; | |
2329 | ||
2330 | spin_lock_irqsave(&pch->lock, flags); | |
2331 | ||
2332 | desc->status = DONE; | |
2333 | ||
2334 | spin_unlock_irqrestore(&pch->lock, flags); | |
2335 | ||
2336 | tasklet_schedule(&pch->task); | |
2337 | } | |
2338 | ||
34d19355 PV |
2339 | static bool pl330_dt_filter(struct dma_chan *chan, void *param) |
2340 | { | |
2341 | struct dma_pl330_filter_args *fargs = param; | |
2342 | ||
2343 | if (chan->device != &fargs->pdmac->ddma) | |
2344 | return false; | |
2345 | ||
2346 | return (chan->chan_id == fargs->chan_id); | |
2347 | } | |
2348 | ||
3e2ec13a TA |
2349 | bool pl330_filter(struct dma_chan *chan, void *param) |
2350 | { | |
cd072515 | 2351 | u8 *peri_id; |
3e2ec13a TA |
2352 | |
2353 | if (chan->device->dev->driver != &pl330_driver.drv) | |
2354 | return false; | |
2355 | ||
cd072515 TA |
2356 | peri_id = chan->private; |
2357 | return *peri_id == (unsigned)param; | |
3e2ec13a TA |
2358 | } |
2359 | EXPORT_SYMBOL(pl330_filter); | |
2360 | ||
a80258f9 PV |
2361 | static struct dma_chan *of_dma_pl330_xlate(struct of_phandle_args *dma_spec, |
2362 | struct of_dma *ofdma) | |
2363 | { | |
2364 | int count = dma_spec->args_count; | |
2365 | struct dma_pl330_dmac *pdmac = ofdma->of_dma_data; | |
2366 | struct dma_pl330_filter_args fargs; | |
2367 | dma_cap_mask_t cap; | |
2368 | ||
2369 | if (!pdmac) | |
2370 | return NULL; | |
2371 | ||
2372 | if (count != 1) | |
2373 | return NULL; | |
2374 | ||
2375 | fargs.pdmac = pdmac; | |
2376 | fargs.chan_id = dma_spec->args[0]; | |
2377 | ||
2378 | dma_cap_zero(cap); | |
2379 | dma_cap_set(DMA_SLAVE, cap); | |
2380 | dma_cap_set(DMA_CYCLIC, cap); | |
2381 | ||
2382 | return dma_request_channel(cap, pl330_dt_filter, &fargs); | |
2383 | } | |
2384 | ||
b3040e40 JB |
2385 | static int pl330_alloc_chan_resources(struct dma_chan *chan) |
2386 | { | |
2387 | struct dma_pl330_chan *pch = to_pchan(chan); | |
2388 | struct dma_pl330_dmac *pdmac = pch->dmac; | |
2389 | unsigned long flags; | |
2390 | ||
2391 | spin_lock_irqsave(&pch->lock, flags); | |
2392 | ||
d3ee98cd | 2393 | dma_cookie_init(chan); |
42bc9cf4 | 2394 | pch->cyclic = false; |
b3040e40 JB |
2395 | |
2396 | pch->pl330_chid = pl330_request_channel(&pdmac->pif); | |
2397 | if (!pch->pl330_chid) { | |
2398 | spin_unlock_irqrestore(&pch->lock, flags); | |
02747885 | 2399 | return -ENOMEM; |
b3040e40 JB |
2400 | } |
2401 | ||
2402 | tasklet_init(&pch->task, pl330_tasklet, (unsigned long) pch); | |
2403 | ||
2404 | spin_unlock_irqrestore(&pch->lock, flags); | |
2405 | ||
2406 | return 1; | |
2407 | } | |
2408 | ||
2409 | static int pl330_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, unsigned long arg) | |
2410 | { | |
2411 | struct dma_pl330_chan *pch = to_pchan(chan); | |
ae43b886 | 2412 | struct dma_pl330_desc *desc, *_dt; |
b3040e40 | 2413 | unsigned long flags; |
1d0c1d60 BK |
2414 | struct dma_pl330_dmac *pdmac = pch->dmac; |
2415 | struct dma_slave_config *slave_config; | |
ae43b886 | 2416 | LIST_HEAD(list); |
b3040e40 | 2417 | |
1d0c1d60 BK |
2418 | switch (cmd) { |
2419 | case DMA_TERMINATE_ALL: | |
2420 | spin_lock_irqsave(&pch->lock, flags); | |
b3040e40 | 2421 | |
1d0c1d60 BK |
2422 | /* FLUSH the PL330 Channel thread */ |
2423 | pl330_chan_ctrl(pch->pl330_chid, PL330_OP_FLUSH); | |
b3040e40 | 2424 | |
1d0c1d60 | 2425 | /* Mark all desc done */ |
ae43b886 | 2426 | list_for_each_entry_safe(desc, _dt, &pch->work_list , node) { |
1d0c1d60 | 2427 | desc->status = DONE; |
ae43b886 BK |
2428 | list_move_tail(&desc->node, &list); |
2429 | } | |
b3040e40 | 2430 | |
ae43b886 | 2431 | list_splice_tail_init(&list, &pdmac->desc_pool); |
1d0c1d60 | 2432 | spin_unlock_irqrestore(&pch->lock, flags); |
1d0c1d60 BK |
2433 | break; |
2434 | case DMA_SLAVE_CONFIG: | |
2435 | slave_config = (struct dma_slave_config *)arg; | |
2436 | ||
db8196df | 2437 | if (slave_config->direction == DMA_MEM_TO_DEV) { |
1d0c1d60 BK |
2438 | if (slave_config->dst_addr) |
2439 | pch->fifo_addr = slave_config->dst_addr; | |
2440 | if (slave_config->dst_addr_width) | |
2441 | pch->burst_sz = __ffs(slave_config->dst_addr_width); | |
2442 | if (slave_config->dst_maxburst) | |
2443 | pch->burst_len = slave_config->dst_maxburst; | |
db8196df | 2444 | } else if (slave_config->direction == DMA_DEV_TO_MEM) { |
1d0c1d60 BK |
2445 | if (slave_config->src_addr) |
2446 | pch->fifo_addr = slave_config->src_addr; | |
2447 | if (slave_config->src_addr_width) | |
2448 | pch->burst_sz = __ffs(slave_config->src_addr_width); | |
2449 | if (slave_config->src_maxburst) | |
2450 | pch->burst_len = slave_config->src_maxburst; | |
2451 | } | |
2452 | break; | |
2453 | default: | |
2454 | dev_err(pch->dmac->pif.dev, "Not supported command.\n"); | |
2455 | return -ENXIO; | |
2456 | } | |
b3040e40 JB |
2457 | |
2458 | return 0; | |
2459 | } | |
2460 | ||
2461 | static void pl330_free_chan_resources(struct dma_chan *chan) | |
2462 | { | |
2463 | struct dma_pl330_chan *pch = to_pchan(chan); | |
2464 | unsigned long flags; | |
2465 | ||
b3040e40 JB |
2466 | tasklet_kill(&pch->task); |
2467 | ||
da331ba8 BZ |
2468 | spin_lock_irqsave(&pch->lock, flags); |
2469 | ||
b3040e40 JB |
2470 | pl330_release_channel(pch->pl330_chid); |
2471 | pch->pl330_chid = NULL; | |
2472 | ||
42bc9cf4 BK |
2473 | if (pch->cyclic) |
2474 | list_splice_tail_init(&pch->work_list, &pch->dmac->desc_pool); | |
2475 | ||
b3040e40 JB |
2476 | spin_unlock_irqrestore(&pch->lock, flags); |
2477 | } | |
2478 | ||
2479 | static enum dma_status | |
2480 | pl330_tx_status(struct dma_chan *chan, dma_cookie_t cookie, | |
2481 | struct dma_tx_state *txstate) | |
2482 | { | |
96a2af41 | 2483 | return dma_cookie_status(chan, cookie, txstate); |
b3040e40 JB |
2484 | } |
2485 | ||
2486 | static void pl330_issue_pending(struct dma_chan *chan) | |
2487 | { | |
2488 | pl330_tasklet((unsigned long) to_pchan(chan)); | |
2489 | } | |
2490 | ||
2491 | /* | |
2492 | * We returned the last one of the circular list of descriptor(s) | |
2493 | * from prep_xxx, so the argument to submit corresponds to the last | |
2494 | * descriptor of the list. | |
2495 | */ | |
2496 | static dma_cookie_t pl330_tx_submit(struct dma_async_tx_descriptor *tx) | |
2497 | { | |
2498 | struct dma_pl330_desc *desc, *last = to_desc(tx); | |
2499 | struct dma_pl330_chan *pch = to_pchan(tx->chan); | |
2500 | dma_cookie_t cookie; | |
2501 | unsigned long flags; | |
2502 | ||
2503 | spin_lock_irqsave(&pch->lock, flags); | |
2504 | ||
2505 | /* Assign cookies to all nodes */ | |
b3040e40 JB |
2506 | while (!list_empty(&last->node)) { |
2507 | desc = list_entry(last->node.next, struct dma_pl330_desc, node); | |
2508 | ||
884485e1 | 2509 | dma_cookie_assign(&desc->txd); |
b3040e40 JB |
2510 | |
2511 | list_move_tail(&desc->node, &pch->work_list); | |
2512 | } | |
2513 | ||
884485e1 | 2514 | cookie = dma_cookie_assign(&last->txd); |
b3040e40 | 2515 | list_add_tail(&last->node, &pch->work_list); |
b3040e40 JB |
2516 | spin_unlock_irqrestore(&pch->lock, flags); |
2517 | ||
2518 | return cookie; | |
2519 | } | |
2520 | ||
2521 | static inline void _init_desc(struct dma_pl330_desc *desc) | |
2522 | { | |
2523 | desc->pchan = NULL; | |
2524 | desc->req.x = &desc->px; | |
2525 | desc->req.token = desc; | |
2526 | desc->rqcfg.swap = SWAP_NO; | |
2527 | desc->rqcfg.privileged = 0; | |
2528 | desc->rqcfg.insnaccess = 0; | |
2529 | desc->rqcfg.scctl = SCCTRL0; | |
2530 | desc->rqcfg.dcctl = DCCTRL0; | |
2531 | desc->req.cfg = &desc->rqcfg; | |
2532 | desc->req.xfer_cb = dma_pl330_rqcb; | |
2533 | desc->txd.tx_submit = pl330_tx_submit; | |
2534 | ||
2535 | INIT_LIST_HEAD(&desc->node); | |
2536 | } | |
2537 | ||
2538 | /* Returns the number of descriptors added to the DMAC pool */ | |
5a67ac57 | 2539 | static int add_desc(struct dma_pl330_dmac *pdmac, gfp_t flg, int count) |
b3040e40 JB |
2540 | { |
2541 | struct dma_pl330_desc *desc; | |
2542 | unsigned long flags; | |
2543 | int i; | |
2544 | ||
2545 | if (!pdmac) | |
2546 | return 0; | |
2547 | ||
2548 | desc = kmalloc(count * sizeof(*desc), flg); | |
2549 | if (!desc) | |
2550 | return 0; | |
2551 | ||
2552 | spin_lock_irqsave(&pdmac->pool_lock, flags); | |
2553 | ||
2554 | for (i = 0; i < count; i++) { | |
2555 | _init_desc(&desc[i]); | |
2556 | list_add_tail(&desc[i].node, &pdmac->desc_pool); | |
2557 | } | |
2558 | ||
2559 | spin_unlock_irqrestore(&pdmac->pool_lock, flags); | |
2560 | ||
2561 | return count; | |
2562 | } | |
2563 | ||
2564 | static struct dma_pl330_desc * | |
2565 | pluck_desc(struct dma_pl330_dmac *pdmac) | |
2566 | { | |
2567 | struct dma_pl330_desc *desc = NULL; | |
2568 | unsigned long flags; | |
2569 | ||
2570 | if (!pdmac) | |
2571 | return NULL; | |
2572 | ||
2573 | spin_lock_irqsave(&pdmac->pool_lock, flags); | |
2574 | ||
2575 | if (!list_empty(&pdmac->desc_pool)) { | |
2576 | desc = list_entry(pdmac->desc_pool.next, | |
2577 | struct dma_pl330_desc, node); | |
2578 | ||
2579 | list_del_init(&desc->node); | |
2580 | ||
2581 | desc->status = PREP; | |
2582 | desc->txd.callback = NULL; | |
2583 | } | |
2584 | ||
2585 | spin_unlock_irqrestore(&pdmac->pool_lock, flags); | |
2586 | ||
2587 | return desc; | |
2588 | } | |
2589 | ||
2590 | static struct dma_pl330_desc *pl330_get_desc(struct dma_pl330_chan *pch) | |
2591 | { | |
2592 | struct dma_pl330_dmac *pdmac = pch->dmac; | |
cd072515 | 2593 | u8 *peri_id = pch->chan.private; |
b3040e40 JB |
2594 | struct dma_pl330_desc *desc; |
2595 | ||
2596 | /* Pluck one desc from the pool of DMAC */ | |
2597 | desc = pluck_desc(pdmac); | |
2598 | ||
2599 | /* If the DMAC pool is empty, alloc new */ | |
2600 | if (!desc) { | |
2601 | if (!add_desc(pdmac, GFP_ATOMIC, 1)) | |
2602 | return NULL; | |
2603 | ||
2604 | /* Try again */ | |
2605 | desc = pluck_desc(pdmac); | |
2606 | if (!desc) { | |
2607 | dev_err(pch->dmac->pif.dev, | |
2608 | "%s:%d ALERT!\n", __func__, __LINE__); | |
2609 | return NULL; | |
2610 | } | |
2611 | } | |
2612 | ||
2613 | /* Initialize the descriptor */ | |
2614 | desc->pchan = pch; | |
2615 | desc->txd.cookie = 0; | |
2616 | async_tx_ack(&desc->txd); | |
2617 | ||
cd072515 | 2618 | desc->req.peri = peri_id ? pch->chan.chan_id : 0; |
3ecf51a4 | 2619 | desc->rqcfg.pcfg = &pch->dmac->pif.pcfg; |
b3040e40 JB |
2620 | |
2621 | dma_async_tx_descriptor_init(&desc->txd, &pch->chan); | |
2622 | ||
2623 | return desc; | |
2624 | } | |
2625 | ||
2626 | static inline void fill_px(struct pl330_xfer *px, | |
2627 | dma_addr_t dst, dma_addr_t src, size_t len) | |
2628 | { | |
2629 | px->next = NULL; | |
2630 | px->bytes = len; | |
2631 | px->dst_addr = dst; | |
2632 | px->src_addr = src; | |
2633 | } | |
2634 | ||
2635 | static struct dma_pl330_desc * | |
2636 | __pl330_prep_dma_memcpy(struct dma_pl330_chan *pch, dma_addr_t dst, | |
2637 | dma_addr_t src, size_t len) | |
2638 | { | |
2639 | struct dma_pl330_desc *desc = pl330_get_desc(pch); | |
2640 | ||
2641 | if (!desc) { | |
2642 | dev_err(pch->dmac->pif.dev, "%s:%d Unable to fetch desc\n", | |
2643 | __func__, __LINE__); | |
2644 | return NULL; | |
2645 | } | |
2646 | ||
2647 | /* | |
2648 | * Ideally we should lookout for reqs bigger than | |
2649 | * those that can be programmed with 256 bytes of | |
2650 | * MC buffer, but considering a req size is seldom | |
2651 | * going to be word-unaligned and more than 200MB, | |
2652 | * we take it easy. | |
2653 | * Also, should the limit is reached we'd rather | |
2654 | * have the platform increase MC buffer size than | |
2655 | * complicating this API driver. | |
2656 | */ | |
2657 | fill_px(&desc->px, dst, src, len); | |
2658 | ||
2659 | return desc; | |
2660 | } | |
2661 | ||
2662 | /* Call after fixing burst size */ | |
2663 | static inline int get_burst_len(struct dma_pl330_desc *desc, size_t len) | |
2664 | { | |
2665 | struct dma_pl330_chan *pch = desc->pchan; | |
2666 | struct pl330_info *pi = &pch->dmac->pif; | |
2667 | int burst_len; | |
2668 | ||
2669 | burst_len = pi->pcfg.data_bus_width / 8; | |
2670 | burst_len *= pi->pcfg.data_buf_dep; | |
2671 | burst_len >>= desc->rqcfg.brst_size; | |
2672 | ||
2673 | /* src/dst_burst_len can't be more than 16 */ | |
2674 | if (burst_len > 16) | |
2675 | burst_len = 16; | |
2676 | ||
2677 | while (burst_len > 1) { | |
2678 | if (!(len % (burst_len << desc->rqcfg.brst_size))) | |
2679 | break; | |
2680 | burst_len--; | |
2681 | } | |
2682 | ||
2683 | return burst_len; | |
2684 | } | |
2685 | ||
42bc9cf4 BK |
2686 | static struct dma_async_tx_descriptor *pl330_prep_dma_cyclic( |
2687 | struct dma_chan *chan, dma_addr_t dma_addr, size_t len, | |
185ecb5f | 2688 | size_t period_len, enum dma_transfer_direction direction, |
ec8b5e48 | 2689 | unsigned long flags, void *context) |
42bc9cf4 BK |
2690 | { |
2691 | struct dma_pl330_desc *desc; | |
2692 | struct dma_pl330_chan *pch = to_pchan(chan); | |
2693 | dma_addr_t dst; | |
2694 | dma_addr_t src; | |
2695 | ||
2696 | desc = pl330_get_desc(pch); | |
2697 | if (!desc) { | |
2698 | dev_err(pch->dmac->pif.dev, "%s:%d Unable to fetch desc\n", | |
2699 | __func__, __LINE__); | |
2700 | return NULL; | |
2701 | } | |
2702 | ||
2703 | switch (direction) { | |
db8196df | 2704 | case DMA_MEM_TO_DEV: |
42bc9cf4 BK |
2705 | desc->rqcfg.src_inc = 1; |
2706 | desc->rqcfg.dst_inc = 0; | |
cd072515 | 2707 | desc->req.rqtype = MEMTODEV; |
42bc9cf4 BK |
2708 | src = dma_addr; |
2709 | dst = pch->fifo_addr; | |
2710 | break; | |
db8196df | 2711 | case DMA_DEV_TO_MEM: |
42bc9cf4 BK |
2712 | desc->rqcfg.src_inc = 0; |
2713 | desc->rqcfg.dst_inc = 1; | |
cd072515 | 2714 | desc->req.rqtype = DEVTOMEM; |
42bc9cf4 BK |
2715 | src = pch->fifo_addr; |
2716 | dst = dma_addr; | |
2717 | break; | |
2718 | default: | |
2719 | dev_err(pch->dmac->pif.dev, "%s:%d Invalid dma direction\n", | |
2720 | __func__, __LINE__); | |
2721 | return NULL; | |
2722 | } | |
2723 | ||
2724 | desc->rqcfg.brst_size = pch->burst_sz; | |
2725 | desc->rqcfg.brst_len = 1; | |
2726 | ||
2727 | pch->cyclic = true; | |
2728 | ||
2729 | fill_px(&desc->px, dst, src, period_len); | |
2730 | ||
2731 | return &desc->txd; | |
2732 | } | |
2733 | ||
b3040e40 JB |
2734 | static struct dma_async_tx_descriptor * |
2735 | pl330_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dst, | |
2736 | dma_addr_t src, size_t len, unsigned long flags) | |
2737 | { | |
2738 | struct dma_pl330_desc *desc; | |
2739 | struct dma_pl330_chan *pch = to_pchan(chan); | |
b3040e40 JB |
2740 | struct pl330_info *pi; |
2741 | int burst; | |
2742 | ||
4e0e6109 | 2743 | if (unlikely(!pch || !len)) |
b3040e40 JB |
2744 | return NULL; |
2745 | ||
b3040e40 JB |
2746 | pi = &pch->dmac->pif; |
2747 | ||
2748 | desc = __pl330_prep_dma_memcpy(pch, dst, src, len); | |
2749 | if (!desc) | |
2750 | return NULL; | |
2751 | ||
2752 | desc->rqcfg.src_inc = 1; | |
2753 | desc->rqcfg.dst_inc = 1; | |
cd072515 | 2754 | desc->req.rqtype = MEMTOMEM; |
b3040e40 JB |
2755 | |
2756 | /* Select max possible burst size */ | |
2757 | burst = pi->pcfg.data_bus_width / 8; | |
2758 | ||
2759 | while (burst > 1) { | |
2760 | if (!(len % burst)) | |
2761 | break; | |
2762 | burst /= 2; | |
2763 | } | |
2764 | ||
2765 | desc->rqcfg.brst_size = 0; | |
2766 | while (burst != (1 << desc->rqcfg.brst_size)) | |
2767 | desc->rqcfg.brst_size++; | |
2768 | ||
2769 | desc->rqcfg.brst_len = get_burst_len(desc, len); | |
2770 | ||
2771 | desc->txd.flags = flags; | |
2772 | ||
2773 | return &desc->txd; | |
2774 | } | |
2775 | ||
2776 | static struct dma_async_tx_descriptor * | |
2777 | pl330_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, | |
db8196df | 2778 | unsigned int sg_len, enum dma_transfer_direction direction, |
185ecb5f | 2779 | unsigned long flg, void *context) |
b3040e40 JB |
2780 | { |
2781 | struct dma_pl330_desc *first, *desc = NULL; | |
2782 | struct dma_pl330_chan *pch = to_pchan(chan); | |
b3040e40 JB |
2783 | struct scatterlist *sg; |
2784 | unsigned long flags; | |
1b9bb715 | 2785 | int i; |
b3040e40 JB |
2786 | dma_addr_t addr; |
2787 | ||
cd072515 | 2788 | if (unlikely(!pch || !sgl || !sg_len)) |
b3040e40 JB |
2789 | return NULL; |
2790 | ||
1b9bb715 | 2791 | addr = pch->fifo_addr; |
b3040e40 JB |
2792 | |
2793 | first = NULL; | |
2794 | ||
2795 | for_each_sg(sgl, sg, sg_len, i) { | |
2796 | ||
2797 | desc = pl330_get_desc(pch); | |
2798 | if (!desc) { | |
2799 | struct dma_pl330_dmac *pdmac = pch->dmac; | |
2800 | ||
2801 | dev_err(pch->dmac->pif.dev, | |
2802 | "%s:%d Unable to fetch desc\n", | |
2803 | __func__, __LINE__); | |
2804 | if (!first) | |
2805 | return NULL; | |
2806 | ||
2807 | spin_lock_irqsave(&pdmac->pool_lock, flags); | |
2808 | ||
2809 | while (!list_empty(&first->node)) { | |
2810 | desc = list_entry(first->node.next, | |
2811 | struct dma_pl330_desc, node); | |
2812 | list_move_tail(&desc->node, &pdmac->desc_pool); | |
2813 | } | |
2814 | ||
2815 | list_move_tail(&first->node, &pdmac->desc_pool); | |
2816 | ||
2817 | spin_unlock_irqrestore(&pdmac->pool_lock, flags); | |
2818 | ||
2819 | return NULL; | |
2820 | } | |
2821 | ||
2822 | if (!first) | |
2823 | first = desc; | |
2824 | else | |
2825 | list_add_tail(&desc->node, &first->node); | |
2826 | ||
db8196df | 2827 | if (direction == DMA_MEM_TO_DEV) { |
b3040e40 JB |
2828 | desc->rqcfg.src_inc = 1; |
2829 | desc->rqcfg.dst_inc = 0; | |
cd072515 | 2830 | desc->req.rqtype = MEMTODEV; |
b3040e40 JB |
2831 | fill_px(&desc->px, |
2832 | addr, sg_dma_address(sg), sg_dma_len(sg)); | |
2833 | } else { | |
2834 | desc->rqcfg.src_inc = 0; | |
2835 | desc->rqcfg.dst_inc = 1; | |
cd072515 | 2836 | desc->req.rqtype = DEVTOMEM; |
b3040e40 JB |
2837 | fill_px(&desc->px, |
2838 | sg_dma_address(sg), addr, sg_dma_len(sg)); | |
2839 | } | |
2840 | ||
1b9bb715 | 2841 | desc->rqcfg.brst_size = pch->burst_sz; |
b3040e40 JB |
2842 | desc->rqcfg.brst_len = 1; |
2843 | } | |
2844 | ||
2845 | /* Return the last desc in the chain */ | |
2846 | desc->txd.flags = flg; | |
2847 | return &desc->txd; | |
2848 | } | |
2849 | ||
2850 | static irqreturn_t pl330_irq_handler(int irq, void *data) | |
2851 | { | |
2852 | if (pl330_update(data)) | |
2853 | return IRQ_HANDLED; | |
2854 | else | |
2855 | return IRQ_NONE; | |
2856 | } | |
2857 | ||
463a1f8b | 2858 | static int |
aa25afad | 2859 | pl330_probe(struct amba_device *adev, const struct amba_id *id) |
b3040e40 JB |
2860 | { |
2861 | struct dma_pl330_platdata *pdat; | |
2862 | struct dma_pl330_dmac *pdmac; | |
0b94c577 | 2863 | struct dma_pl330_chan *pch, *_p; |
b3040e40 JB |
2864 | struct pl330_info *pi; |
2865 | struct dma_device *pd; | |
2866 | struct resource *res; | |
2867 | int i, ret, irq; | |
4e0e6109 | 2868 | int num_chan; |
b3040e40 JB |
2869 | |
2870 | pdat = adev->dev.platform_data; | |
2871 | ||
b3040e40 | 2872 | /* Allocate a new DMAC and its Channels */ |
e4d43c17 | 2873 | pdmac = devm_kzalloc(&adev->dev, sizeof(*pdmac), GFP_KERNEL); |
b3040e40 JB |
2874 | if (!pdmac) { |
2875 | dev_err(&adev->dev, "unable to allocate mem\n"); | |
2876 | return -ENOMEM; | |
2877 | } | |
2878 | ||
2879 | pi = &pdmac->pif; | |
2880 | pi->dev = &adev->dev; | |
2881 | pi->pl330_data = NULL; | |
4e0e6109 | 2882 | pi->mcbufsz = pdat ? pdat->mcbuf_sz : 0; |
b3040e40 JB |
2883 | |
2884 | res = &adev->res; | |
bcc7fa95 SK |
2885 | pi->base = devm_ioremap_resource(&adev->dev, res); |
2886 | if (IS_ERR(pi->base)) | |
2887 | return PTR_ERR(pi->base); | |
b3040e40 | 2888 | |
a2f5203f BK |
2889 | amba_set_drvdata(adev, pdmac); |
2890 | ||
b3040e40 JB |
2891 | irq = adev->irq[0]; |
2892 | ret = request_irq(irq, pl330_irq_handler, 0, | |
2893 | dev_name(&adev->dev), pi); | |
2894 | if (ret) | |
e4d43c17 | 2895 | return ret; |
b3040e40 | 2896 | |
09677176 | 2897 | pi->pcfg.periph_id = adev->periphid; |
b3040e40 JB |
2898 | ret = pl330_add(pi); |
2899 | if (ret) | |
e4d43c17 | 2900 | goto probe_err1; |
b3040e40 JB |
2901 | |
2902 | INIT_LIST_HEAD(&pdmac->desc_pool); | |
2903 | spin_lock_init(&pdmac->pool_lock); | |
2904 | ||
2905 | /* Create a descriptor pool of default size */ | |
2906 | if (!add_desc(pdmac, GFP_KERNEL, NR_DEFAULT_DESC)) | |
2907 | dev_warn(&adev->dev, "unable to allocate desc\n"); | |
2908 | ||
2909 | pd = &pdmac->ddma; | |
2910 | INIT_LIST_HEAD(&pd->channels); | |
2911 | ||
2912 | /* Initialize channel parameters */ | |
c8473828 OJ |
2913 | if (pdat) |
2914 | num_chan = max_t(int, pdat->nr_valid_peri, pi->pcfg.num_chan); | |
2915 | else | |
2916 | num_chan = max_t(int, pi->pcfg.num_peri, pi->pcfg.num_chan); | |
2917 | ||
4e0e6109 | 2918 | pdmac->peripherals = kzalloc(num_chan * sizeof(*pch), GFP_KERNEL); |
61c6e753 SK |
2919 | if (!pdmac->peripherals) { |
2920 | ret = -ENOMEM; | |
2921 | dev_err(&adev->dev, "unable to allocate pdmac->peripherals\n"); | |
e4d43c17 | 2922 | goto probe_err2; |
61c6e753 | 2923 | } |
b3040e40 | 2924 | |
4e0e6109 RH |
2925 | for (i = 0; i < num_chan; i++) { |
2926 | pch = &pdmac->peripherals[i]; | |
93ed5544 TA |
2927 | if (!adev->dev.of_node) |
2928 | pch->chan.private = pdat ? &pdat->peri_id[i] : NULL; | |
2929 | else | |
2930 | pch->chan.private = adev->dev.of_node; | |
b3040e40 JB |
2931 | |
2932 | INIT_LIST_HEAD(&pch->work_list); | |
2933 | spin_lock_init(&pch->lock); | |
2934 | pch->pl330_chid = NULL; | |
b3040e40 | 2935 | pch->chan.device = pd; |
b3040e40 JB |
2936 | pch->dmac = pdmac; |
2937 | ||
2938 | /* Add the channel to the DMAC list */ | |
b3040e40 JB |
2939 | list_add_tail(&pch->chan.device_node, &pd->channels); |
2940 | } | |
2941 | ||
2942 | pd->dev = &adev->dev; | |
93ed5544 | 2943 | if (pdat) { |
cd072515 | 2944 | pd->cap_mask = pdat->cap_mask; |
93ed5544 | 2945 | } else { |
cd072515 | 2946 | dma_cap_set(DMA_MEMCPY, pd->cap_mask); |
93ed5544 TA |
2947 | if (pi->pcfg.num_peri) { |
2948 | dma_cap_set(DMA_SLAVE, pd->cap_mask); | |
2949 | dma_cap_set(DMA_CYCLIC, pd->cap_mask); | |
5557a419 | 2950 | dma_cap_set(DMA_PRIVATE, pd->cap_mask); |
93ed5544 TA |
2951 | } |
2952 | } | |
b3040e40 JB |
2953 | |
2954 | pd->device_alloc_chan_resources = pl330_alloc_chan_resources; | |
2955 | pd->device_free_chan_resources = pl330_free_chan_resources; | |
2956 | pd->device_prep_dma_memcpy = pl330_prep_dma_memcpy; | |
42bc9cf4 | 2957 | pd->device_prep_dma_cyclic = pl330_prep_dma_cyclic; |
b3040e40 JB |
2958 | pd->device_tx_status = pl330_tx_status; |
2959 | pd->device_prep_slave_sg = pl330_prep_slave_sg; | |
2960 | pd->device_control = pl330_control; | |
2961 | pd->device_issue_pending = pl330_issue_pending; | |
2962 | ||
2963 | ret = dma_async_device_register(pd); | |
2964 | if (ret) { | |
2965 | dev_err(&adev->dev, "unable to register DMAC\n"); | |
0b94c577 PV |
2966 | goto probe_err3; |
2967 | } | |
2968 | ||
2969 | if (adev->dev.of_node) { | |
2970 | ret = of_dma_controller_register(adev->dev.of_node, | |
2971 | of_dma_pl330_xlate, pdmac); | |
2972 | if (ret) { | |
2973 | dev_err(&adev->dev, | |
2974 | "unable to register DMA to the generic DT DMA helpers\n"); | |
2975 | } | |
b3040e40 JB |
2976 | } |
2977 | ||
b3040e40 JB |
2978 | dev_info(&adev->dev, |
2979 | "Loaded driver for PL330 DMAC-%d\n", adev->periphid); | |
2980 | dev_info(&adev->dev, | |
2981 | "\tDBUFF-%ux%ubytes Num_Chans-%u Num_Peri-%u Num_Events-%u\n", | |
2982 | pi->pcfg.data_buf_dep, | |
2983 | pi->pcfg.data_bus_width / 8, pi->pcfg.num_chan, | |
2984 | pi->pcfg.num_peri, pi->pcfg.num_events); | |
2985 | ||
2986 | return 0; | |
0b94c577 PV |
2987 | probe_err3: |
2988 | amba_set_drvdata(adev, NULL); | |
b3040e40 | 2989 | |
0b94c577 PV |
2990 | /* Idle the DMAC */ |
2991 | list_for_each_entry_safe(pch, _p, &pdmac->ddma.channels, | |
2992 | chan.device_node) { | |
2993 | ||
2994 | /* Remove the channel */ | |
2995 | list_del(&pch->chan.device_node); | |
2996 | ||
2997 | /* Flush the channel */ | |
2998 | pl330_control(&pch->chan, DMA_TERMINATE_ALL, 0); | |
2999 | pl330_free_chan_resources(&pch->chan); | |
3000 | } | |
b3040e40 | 3001 | probe_err2: |
e4d43c17 | 3002 | pl330_del(pi); |
b3040e40 | 3003 | probe_err1: |
e4d43c17 | 3004 | free_irq(irq, pi); |
b3040e40 JB |
3005 | |
3006 | return ret; | |
3007 | } | |
3008 | ||
4bf27b8b | 3009 | static int pl330_remove(struct amba_device *adev) |
b3040e40 JB |
3010 | { |
3011 | struct dma_pl330_dmac *pdmac = amba_get_drvdata(adev); | |
3012 | struct dma_pl330_chan *pch, *_p; | |
3013 | struct pl330_info *pi; | |
b3040e40 JB |
3014 | int irq; |
3015 | ||
3016 | if (!pdmac) | |
3017 | return 0; | |
3018 | ||
0b94c577 PV |
3019 | if (adev->dev.of_node) |
3020 | of_dma_controller_free(adev->dev.of_node); | |
421da89a | 3021 | |
0b94c577 | 3022 | dma_async_device_unregister(&pdmac->ddma); |
b3040e40 JB |
3023 | amba_set_drvdata(adev, NULL); |
3024 | ||
3025 | /* Idle the DMAC */ | |
3026 | list_for_each_entry_safe(pch, _p, &pdmac->ddma.channels, | |
3027 | chan.device_node) { | |
3028 | ||
3029 | /* Remove the channel */ | |
3030 | list_del(&pch->chan.device_node); | |
3031 | ||
3032 | /* Flush the channel */ | |
3033 | pl330_control(&pch->chan, DMA_TERMINATE_ALL, 0); | |
3034 | pl330_free_chan_resources(&pch->chan); | |
3035 | } | |
3036 | ||
3037 | pi = &pdmac->pif; | |
3038 | ||
3039 | pl330_del(pi); | |
3040 | ||
3041 | irq = adev->irq[0]; | |
3042 | free_irq(irq, pi); | |
3043 | ||
b3040e40 JB |
3044 | return 0; |
3045 | } | |
3046 | ||
3047 | static struct amba_id pl330_ids[] = { | |
3048 | { | |
3049 | .id = 0x00041330, | |
3050 | .mask = 0x000fffff, | |
3051 | }, | |
3052 | { 0, 0 }, | |
3053 | }; | |
3054 | ||
e8fa516a DM |
3055 | MODULE_DEVICE_TABLE(amba, pl330_ids); |
3056 | ||
b3040e40 JB |
3057 | static struct amba_driver pl330_driver = { |
3058 | .drv = { | |
3059 | .owner = THIS_MODULE, | |
3060 | .name = "dma-pl330", | |
3061 | }, | |
3062 | .id_table = pl330_ids, | |
3063 | .probe = pl330_probe, | |
3064 | .remove = pl330_remove, | |
3065 | }; | |
3066 | ||
9e5ed094 | 3067 | module_amba_driver(pl330_driver); |
b3040e40 JB |
3068 | |
3069 | MODULE_AUTHOR("Jaswinder Singh <jassi.brar@samsung.com>"); | |
3070 | MODULE_DESCRIPTION("API Driver for PL330 DMAC"); | |
3071 | MODULE_LICENSE("GPL"); |