projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
net/mlx5: Kconfig: Fix MLX5_EN/VXLAN build issue
[deliverable/linux.git] / drivers / dma / pxa_dma.c
1 /*
2 * Copyright 2015 Robert Jarzmik <robert.jarzmik@free.fr>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 */
8
9 #include <linux/err.h>
10 #include <linux/module.h>
11 #include <linux/init.h>
12 #include <linux/types.h>
13 #include <linux/interrupt.h>
14 #include <linux/dma-mapping.h>
15 #include <linux/slab.h>
16 #include <linux/dmaengine.h>
17 #include <linux/platform_device.h>
18 #include <linux/device.h>
19 #include <linux/platform_data/mmp_dma.h>
20 #include <linux/dmapool.h>
21 #include <linux/of_device.h>
22 #include <linux/of_dma.h>
23 #include <linux/of.h>
24 #include <linux/dma/pxa-dma.h>
25
26 #include "dmaengine.h"
27 #include "virt-dma.h"
28
29 #define DCSR(n) (0x0000 + ((n) << 2))
30 #define DALGN(n) 0x00a0
31 #define DINT 0x00f0
32 #define DDADR(n) (0x0200 + ((n) << 4))
33 #define DSADR(n) (0x0204 + ((n) << 4))
34 #define DTADR(n) (0x0208 + ((n) << 4))
35 #define DCMD(n) (0x020c + ((n) << 4))
36
37 #define PXA_DCSR_RUN BIT(31) /* Run Bit (read / write) */
38 #define PXA_DCSR_NODESC BIT(30) /* No-Descriptor Fetch (read / write) */
39 #define PXA_DCSR_STOPIRQEN BIT(29) /* Stop Interrupt Enable (R/W) */
40 #define PXA_DCSR_REQPEND BIT(8) /* Request Pending (read-only) */
41 #define PXA_DCSR_STOPSTATE BIT(3) /* Stop State (read-only) */
42 #define PXA_DCSR_ENDINTR BIT(2) /* End Interrupt (read / write) */
43 #define PXA_DCSR_STARTINTR BIT(1) /* Start Interrupt (read / write) */
44 #define PXA_DCSR_BUSERR BIT(0) /* Bus Error Interrupt (read / write) */
45
46 #define PXA_DCSR_EORIRQEN BIT(28) /* End of Receive IRQ Enable (R/W) */
47 #define PXA_DCSR_EORJMPEN BIT(27) /* Jump to next descriptor on EOR */
48 #define PXA_DCSR_EORSTOPEN BIT(26) /* STOP on an EOR */
49 #define PXA_DCSR_SETCMPST BIT(25) /* Set Descriptor Compare Status */
50 #define PXA_DCSR_CLRCMPST BIT(24) /* Clear Descriptor Compare Status */
51 #define PXA_DCSR_CMPST BIT(10) /* The Descriptor Compare Status */
52 #define PXA_DCSR_EORINTR BIT(9) /* The end of Receive */
53
54 #define DRCMR_MAPVLD BIT(7) /* Map Valid (read / write) */
55 #define DRCMR_CHLNUM 0x1f /* mask for Channel Number (read / write) */
56
57 #define DDADR_DESCADDR 0xfffffff0 /* Address of next descriptor (mask) */
58 #define DDADR_STOP BIT(0) /* Stop (read / write) */
59
60 #define PXA_DCMD_INCSRCADDR BIT(31) /* Source Address Increment Setting. */
61 #define PXA_DCMD_INCTRGADDR BIT(30) /* Target Address Increment Setting. */
62 #define PXA_DCMD_FLOWSRC BIT(29) /* Flow Control by the source. */
63 #define PXA_DCMD_FLOWTRG BIT(28) /* Flow Control by the target. */
64 #define PXA_DCMD_STARTIRQEN BIT(22) /* Start Interrupt Enable */
65 #define PXA_DCMD_ENDIRQEN BIT(21) /* End Interrupt Enable */
66 #define PXA_DCMD_ENDIAN BIT(18) /* Device Endian-ness. */
67 #define PXA_DCMD_BURST8 (1 << 16) /* 8 byte burst */
68 #define PXA_DCMD_BURST16 (2 << 16) /* 16 byte burst */
69 #define PXA_DCMD_BURST32 (3 << 16) /* 32 byte burst */
70 #define PXA_DCMD_WIDTH1 (1 << 14) /* 1 byte width */
71 #define PXA_DCMD_WIDTH2 (2 << 14) /* 2 byte width (HalfWord) */
72 #define PXA_DCMD_WIDTH4 (3 << 14) /* 4 byte width (Word) */
73 #define PXA_DCMD_LENGTH 0x01fff /* length mask (max = 8K - 1) */
74
75 #define PDMA_ALIGNMENT 3
76 #define PDMA_MAX_DESC_BYTES (PXA_DCMD_LENGTH & ~((1 << PDMA_ALIGNMENT) - 1))
77
78 struct pxad_desc_hw {
79 u32 ddadr; /* Points to the next descriptor + flags */
80 u32 dsadr; /* DSADR value for the current transfer */
81 u32 dtadr; /* DTADR value for the current transfer */
82 u32 dcmd; /* DCMD value for the current transfer */
83 } __aligned(16);
84
85 struct pxad_desc_sw {
86 struct virt_dma_desc vd; /* Virtual descriptor */
87 int nb_desc; /* Number of hw. descriptors */
88 size_t len; /* Number of bytes xfered */
89 dma_addr_t first; /* First descriptor's addr */
90
91 /* At least one descriptor has an src/dst address not multiple of 8 */
92 bool misaligned;
93 bool cyclic;
94 struct dma_pool *desc_pool; /* Channel's used allocator */
95
96 struct pxad_desc_hw *hw_desc[]; /* DMA coherent descriptors */
97 };
98
99 struct pxad_phy {
100 int idx;
101 void __iomem *base;
102 struct pxad_chan *vchan;
103 };
104
105 struct pxad_chan {
106 struct virt_dma_chan vc; /* Virtual channel */
107 u32 drcmr; /* Requestor of the channel */
108 enum pxad_chan_prio prio; /* Required priority of phy */
109 /*
110 * At least one desc_sw in submitted or issued transfers on this channel
111 * has one address such as: addr % 8 != 0. This implies the DALGN
112 * setting on the phy.
113 */
114 bool misaligned;
115 struct dma_slave_config cfg; /* Runtime config */
116
117 /* protected by vc->lock */
118 struct pxad_phy *phy;
119 struct dma_pool *desc_pool; /* Descriptors pool */
120 };
121
122 struct pxad_device {
123 struct dma_device slave;
124 int nr_chans;
125 int nr_requestors;
126 void __iomem *base;
127 struct pxad_phy *phys;
128 spinlock_t phy_lock; /* Phy association */
129 #ifdef CONFIG_DEBUG_FS
130 struct dentry *dbgfs_root;
131 struct dentry *dbgfs_state;
132 struct dentry **dbgfs_chan;
133 #endif
134 };
135
136 #define tx_to_pxad_desc(tx) \
137 container_of(tx, struct pxad_desc_sw, async_tx)
138 #define to_pxad_chan(dchan) \
139 container_of(dchan, struct pxad_chan, vc.chan)
140 #define to_pxad_dev(dmadev) \
141 container_of(dmadev, struct pxad_device, slave)
142 #define to_pxad_sw_desc(_vd) \
143 container_of((_vd), struct pxad_desc_sw, vd)
144
145 #define _phy_readl_relaxed(phy, _reg) \
146 readl_relaxed((phy)->base + _reg((phy)->idx))
147 #define phy_readl_relaxed(phy, _reg) \
148 ({ \
149 u32 _v; \
150 _v = readl_relaxed((phy)->base + _reg((phy)->idx)); \
151 dev_vdbg(&phy->vchan->vc.chan.dev->device, \
152 "%s(): readl(%s): 0x%08x\n", __func__, #_reg, \
153 _v); \
154 _v; \
155 })
156 #define phy_writel(phy, val, _reg) \
157 do { \
158 writel((val), (phy)->base + _reg((phy)->idx)); \
159 dev_vdbg(&phy->vchan->vc.chan.dev->device, \
160 "%s(): writel(0x%08x, %s)\n", \
161 __func__, (u32)(val), #_reg); \
162 } while (0)
163 #define phy_writel_relaxed(phy, val, _reg) \
164 do { \
165 writel_relaxed((val), (phy)->base + _reg((phy)->idx)); \
166 dev_vdbg(&phy->vchan->vc.chan.dev->device, \
167 "%s(): writel_relaxed(0x%08x, %s)\n", \
168 __func__, (u32)(val), #_reg); \
169 } while (0)
170
171 static unsigned int pxad_drcmr(unsigned int line)
172 {
173 if (line < 64)
174 return 0x100 + line * 4;
175 return 0x1000 + line * 4;
176 }
177
178 /*
179 * Debug fs
180 */
181 #ifdef CONFIG_DEBUG_FS
182 #include <linux/debugfs.h>
183 #include <linux/uaccess.h>
184 #include <linux/seq_file.h>
185
186 static int dbg_show_requester_chan(struct seq_file *s, void *p)
187 {
188 struct pxad_phy *phy = s->private;
189 int i;
190 u32 drcmr;
191
192 seq_printf(s, "DMA channel %d requester :\n", phy->idx);
193 for (i = 0; i < 70; i++) {
194 drcmr = readl_relaxed(phy->base + pxad_drcmr(i));
195 if ((drcmr & DRCMR_CHLNUM) == phy->idx)
196 seq_printf(s, "\tRequester %d (MAPVLD=%d)\n", i,
197 !!(drcmr & DRCMR_MAPVLD));
198 }
199 return 0;
200 }
201
202 static inline int dbg_burst_from_dcmd(u32 dcmd)
203 {
204 int burst = (dcmd >> 16) & 0x3;
205
206 return burst ? 4 << burst : 0;
207 }
208
209 static int is_phys_valid(unsigned long addr)
210 {
211 return pfn_valid(__phys_to_pfn(addr));
212 }
213
214 #define PXA_DCSR_STR(flag) (dcsr & PXA_DCSR_##flag ? #flag" " : "")
215 #define PXA_DCMD_STR(flag) (dcmd & PXA_DCMD_##flag ? #flag" " : "")
216
217 static int dbg_show_descriptors(struct seq_file *s, void *p)
218 {
219 struct pxad_phy *phy = s->private;
220 int i, max_show = 20, burst, width;
221 u32 dcmd;
222 unsigned long phys_desc, ddadr;
223 struct pxad_desc_hw *desc;
224
225 phys_desc = ddadr = _phy_readl_relaxed(phy, DDADR);
226
227 seq_printf(s, "DMA channel %d descriptors :\n", phy->idx);
228 seq_printf(s, "[%03d] First descriptor unknown\n", 0);
229 for (i = 1; i < max_show && is_phys_valid(phys_desc); i++) {
230 desc = phys_to_virt(phys_desc);
231 dcmd = desc->dcmd;
232 burst = dbg_burst_from_dcmd(dcmd);
233 width = (1 << ((dcmd >> 14) & 0x3)) >> 1;
234
235 seq_printf(s, "[%03d] Desc at %08lx(virt %p)\n",
236 i, phys_desc, desc);
237 seq_printf(s, "\tDDADR = %08x\n", desc->ddadr);
238 seq_printf(s, "\tDSADR = %08x\n", desc->dsadr);
239 seq_printf(s, "\tDTADR = %08x\n", desc->dtadr);
240 seq_printf(s, "\tDCMD = %08x (%s%s%s%s%s%s%sburst=%d width=%d len=%d)\n",
241 dcmd,
242 PXA_DCMD_STR(INCSRCADDR), PXA_DCMD_STR(INCTRGADDR),
243 PXA_DCMD_STR(FLOWSRC), PXA_DCMD_STR(FLOWTRG),
244 PXA_DCMD_STR(STARTIRQEN), PXA_DCMD_STR(ENDIRQEN),
245 PXA_DCMD_STR(ENDIAN), burst, width,
246 dcmd & PXA_DCMD_LENGTH);
247 phys_desc = desc->ddadr;
248 }
249 if (i == max_show)
250 seq_printf(s, "[%03d] Desc at %08lx ... max display reached\n",
251 i, phys_desc);
252 else
253 seq_printf(s, "[%03d] Desc at %08lx is %s\n",
254 i, phys_desc, phys_desc == DDADR_STOP ?
255 "DDADR_STOP" : "invalid");
256
257 return 0;
258 }
259
260 static int dbg_show_chan_state(struct seq_file *s, void *p)
261 {
262 struct pxad_phy *phy = s->private;
263 u32 dcsr, dcmd;
264 int burst, width;
265 static const char * const str_prio[] = {
266 "high", "normal", "low", "invalid"
267 };
268
269 dcsr = _phy_readl_relaxed(phy, DCSR);
270 dcmd = _phy_readl_relaxed(phy, DCMD);
271 burst = dbg_burst_from_dcmd(dcmd);
272 width = (1 << ((dcmd >> 14) & 0x3)) >> 1;
273
274 seq_printf(s, "DMA channel %d\n", phy->idx);
275 seq_printf(s, "\tPriority : %s\n",
276 str_prio[(phy->idx & 0xf) / 4]);
277 seq_printf(s, "\tUnaligned transfer bit: %s\n",
278 _phy_readl_relaxed(phy, DALGN) & BIT(phy->idx) ?
279 "yes" : "no");
280 seq_printf(s, "\tDCSR = %08x (%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s)\n",
281 dcsr, PXA_DCSR_STR(RUN), PXA_DCSR_STR(NODESC),
282 PXA_DCSR_STR(STOPIRQEN), PXA_DCSR_STR(EORIRQEN),
283 PXA_DCSR_STR(EORJMPEN), PXA_DCSR_STR(EORSTOPEN),
284 PXA_DCSR_STR(SETCMPST), PXA_DCSR_STR(CLRCMPST),
285 PXA_DCSR_STR(CMPST), PXA_DCSR_STR(EORINTR),
286 PXA_DCSR_STR(REQPEND), PXA_DCSR_STR(STOPSTATE),
287 PXA_DCSR_STR(ENDINTR), PXA_DCSR_STR(STARTINTR),
288 PXA_DCSR_STR(BUSERR));
289
290 seq_printf(s, "\tDCMD = %08x (%s%s%s%s%s%s%sburst=%d width=%d len=%d)\n",
291 dcmd,
292 PXA_DCMD_STR(INCSRCADDR), PXA_DCMD_STR(INCTRGADDR),
293 PXA_DCMD_STR(FLOWSRC), PXA_DCMD_STR(FLOWTRG),
294 PXA_DCMD_STR(STARTIRQEN), PXA_DCMD_STR(ENDIRQEN),
295 PXA_DCMD_STR(ENDIAN), burst, width, dcmd & PXA_DCMD_LENGTH);
296 seq_printf(s, "\tDSADR = %08x\n", _phy_readl_relaxed(phy, DSADR));
297 seq_printf(s, "\tDTADR = %08x\n", _phy_readl_relaxed(phy, DTADR));
298 seq_printf(s, "\tDDADR = %08x\n", _phy_readl_relaxed(phy, DDADR));
299
300 return 0;
301 }
302
303 static int dbg_show_state(struct seq_file *s, void *p)
304 {
305 struct pxad_device *pdev = s->private;
306
307 /* basic device status */
308 seq_puts(s, "DMA engine status\n");
309 seq_printf(s, "\tChannel number: %d\n", pdev->nr_chans);
310
311 return 0;
312 }
313
314 #define DBGFS_FUNC_DECL(name) \
315 static int dbg_open_##name(struct inode *inode, struct file *file) \
316 { \
317 return single_open(file, dbg_show_##name, inode->i_private); \
318 } \
319 static const struct file_operations dbg_fops_##name = { \
320 .owner = THIS_MODULE, \
321 .open = dbg_open_##name, \
322 .llseek = seq_lseek, \
323 .read = seq_read, \
324 .release = single_release, \
325 }
326
327 DBGFS_FUNC_DECL(state);
328 DBGFS_FUNC_DECL(chan_state);
329 DBGFS_FUNC_DECL(descriptors);
330 DBGFS_FUNC_DECL(requester_chan);
331
332 static struct dentry *pxad_dbg_alloc_chan(struct pxad_device *pdev,
333 int ch, struct dentry *chandir)
334 {
335 char chan_name[11];
336 struct dentry *chan, *chan_state = NULL, *chan_descr = NULL;
337 struct dentry *chan_reqs = NULL;
338 void *dt;
339
340 scnprintf(chan_name, sizeof(chan_name), "%d", ch);
341 chan = debugfs_create_dir(chan_name, chandir);
342 dt = (void *)&pdev->phys[ch];
343
344 if (chan)
345 chan_state = debugfs_create_file("state", 0400, chan, dt,
346 &dbg_fops_chan_state);
347 if (chan_state)
348 chan_descr = debugfs_create_file("descriptors", 0400, chan, dt,
349 &dbg_fops_descriptors);
350 if (chan_descr)
351 chan_reqs = debugfs_create_file("requesters", 0400, chan, dt,
352 &dbg_fops_requester_chan);
353 if (!chan_reqs)
354 goto err_state;
355
356 return chan;
357
358 err_state:
359 debugfs_remove_recursive(chan);
360 return NULL;
361 }
362
363 static void pxad_init_debugfs(struct pxad_device *pdev)
364 {
365 int i;
366 struct dentry *chandir;
367
368 pdev->dbgfs_root = debugfs_create_dir(dev_name(pdev->slave.dev), NULL);
369 if (IS_ERR(pdev->dbgfs_root) || !pdev->dbgfs_root)
370 goto err_root;
371
372 pdev->dbgfs_state = debugfs_create_file("state", 0400, pdev->dbgfs_root,
373 pdev, &dbg_fops_state);
374 if (!pdev->dbgfs_state)
375 goto err_state;
376
377 pdev->dbgfs_chan =
378 kmalloc_array(pdev->nr_chans, sizeof(*pdev->dbgfs_state),
379 GFP_KERNEL);
380 if (!pdev->dbgfs_chan)
381 goto err_alloc;
382
383 chandir = debugfs_create_dir("channels", pdev->dbgfs_root);
384 if (!chandir)
385 goto err_chandir;
386
387 for (i = 0; i < pdev->nr_chans; i++) {
388 pdev->dbgfs_chan[i] = pxad_dbg_alloc_chan(pdev, i, chandir);
389 if (!pdev->dbgfs_chan[i])
390 goto err_chans;
391 }
392
393 return;
394 err_chans:
395 err_chandir:
396 kfree(pdev->dbgfs_chan);
397 err_alloc:
398 err_state:
399 debugfs_remove_recursive(pdev->dbgfs_root);
400 err_root:
401 pr_err("pxad: debugfs is not available\n");
402 }
403
404 static void pxad_cleanup_debugfs(struct pxad_device *pdev)
405 {
406 debugfs_remove_recursive(pdev->dbgfs_root);
407 }
408 #else
409 static inline void pxad_init_debugfs(struct pxad_device *pdev) {}
410 static inline void pxad_cleanup_debugfs(struct pxad_device *pdev) {}
411 #endif
412
413 /*
414 * In the transition phase where legacy pxa handling is done at the same time as
415 * mmp_dma, the DMA physical channel split between the 2 DMA providers is done
416 * through legacy_reserved. Legacy code reserves DMA channels by settings
417 * corresponding bits in legacy_reserved.
418 */
419 static u32 legacy_reserved;
420 static u32 legacy_unavailable;
421
422 static struct pxad_phy *lookup_phy(struct pxad_chan *pchan)
423 {
424 int prio, i;
425 struct pxad_device *pdev = to_pxad_dev(pchan->vc.chan.device);
426 struct pxad_phy *phy, *found = NULL;
427 unsigned long flags;
428
429 /*
430 * dma channel priorities
431 * ch 0 - 3, 16 - 19 <--> (0)
432 * ch 4 - 7, 20 - 23 <--> (1)
433 * ch 8 - 11, 24 - 27 <--> (2)
434 * ch 12 - 15, 28 - 31 <--> (3)
435 */
436
437 spin_lock_irqsave(&pdev->phy_lock, flags);
438 for (prio = pchan->prio; prio >= PXAD_PRIO_HIGHEST; prio--) {
439 for (i = 0; i < pdev->nr_chans; i++) {
440 if (prio != (i & 0xf) >> 2)
441 continue;
442 if ((i < 32) && (legacy_reserved & BIT(i)))
443 continue;
444 phy = &pdev->phys[i];
445 if (!phy->vchan) {
446 phy->vchan = pchan;
447 found = phy;
448 if (i < 32)
449 legacy_unavailable |= BIT(i);
450 goto out_unlock;
451 }
452 }
453 }
454
455 out_unlock:
456 spin_unlock_irqrestore(&pdev->phy_lock, flags);
457 dev_dbg(&pchan->vc.chan.dev->device,
458 "%s(): phy=%p(%d)\n", __func__, found,
459 found ? found->idx : -1);
460
461 return found;
462 }
463
464 static void pxad_free_phy(struct pxad_chan *chan)
465 {
466 struct pxad_device *pdev = to_pxad_dev(chan->vc.chan.device);
467 unsigned long flags;
468 u32 reg;
469 int i;
470
471 dev_dbg(&chan->vc.chan.dev->device,
472 "%s(): freeing\n", __func__);
473 if (!chan->phy)
474 return;
475
476 /* clear the channel mapping in DRCMR */
477 if (chan->drcmr <= pdev->nr_requestors) {
478 reg = pxad_drcmr(chan->drcmr);
479 writel_relaxed(0, chan->phy->base + reg);
480 }
481
482 spin_lock_irqsave(&pdev->phy_lock, flags);
483 for (i = 0; i < 32; i++)
484 if (chan->phy == &pdev->phys[i])
485 legacy_unavailable &= ~BIT(i);
486 chan->phy->vchan = NULL;
487 chan->phy = NULL;
488 spin_unlock_irqrestore(&pdev->phy_lock, flags);
489 }
490
491 static bool is_chan_running(struct pxad_chan *chan)
492 {
493 u32 dcsr;
494 struct pxad_phy *phy = chan->phy;
495
496 if (!phy)
497 return false;
498 dcsr = phy_readl_relaxed(phy, DCSR);
499 return dcsr & PXA_DCSR_RUN;
500 }
501
502 static bool is_running_chan_misaligned(struct pxad_chan *chan)
503 {
504 u32 dalgn;
505
506 BUG_ON(!chan->phy);
507 dalgn = phy_readl_relaxed(chan->phy, DALGN);
508 return dalgn & (BIT(chan->phy->idx));
509 }
510
511 static void phy_enable(struct pxad_phy *phy, bool misaligned)
512 {
513 struct pxad_device *pdev;
514 u32 reg, dalgn;
515
516 if (!phy->vchan)
517 return;
518
519 dev_dbg(&phy->vchan->vc.chan.dev->device,
520 "%s(); phy=%p(%d) misaligned=%d\n", __func__,
521 phy, phy->idx, misaligned);
522
523 pdev = to_pxad_dev(phy->vchan->vc.chan.device);
524 if (phy->vchan->drcmr <= pdev->nr_requestors) {
525 reg = pxad_drcmr(phy->vchan->drcmr);
526 writel_relaxed(DRCMR_MAPVLD | phy->idx, phy->base + reg);
527 }
528
529 dalgn = phy_readl_relaxed(phy, DALGN);
530 if (misaligned)
531 dalgn |= BIT(phy->idx);
532 else
533 dalgn &= ~BIT(phy->idx);
534 phy_writel_relaxed(phy, dalgn, DALGN);
535
536 phy_writel(phy, PXA_DCSR_STOPIRQEN | PXA_DCSR_ENDINTR |
537 PXA_DCSR_BUSERR | PXA_DCSR_RUN, DCSR);
538 }
539
540 static void phy_disable(struct pxad_phy *phy)
541 {
542 u32 dcsr;
543
544 if (!phy)
545 return;
546
547 dcsr = phy_readl_relaxed(phy, DCSR);
548 dev_dbg(&phy->vchan->vc.chan.dev->device,
549 "%s(): phy=%p(%d)\n", __func__, phy, phy->idx);
550 phy_writel(phy, dcsr & ~PXA_DCSR_RUN & ~PXA_DCSR_STOPIRQEN, DCSR);
551 }
552
553 static void pxad_launch_chan(struct pxad_chan *chan,
554 struct pxad_desc_sw *desc)
555 {
556 dev_dbg(&chan->vc.chan.dev->device,
557 "%s(): desc=%p\n", __func__, desc);
558 if (!chan->phy) {
559 chan->phy = lookup_phy(chan);
560 if (!chan->phy) {
561 dev_dbg(&chan->vc.chan.dev->device,
562 "%s(): no free dma channel\n", __func__);
563 return;
564 }
565 }
566
567 /*
568 * Program the descriptor's address into the DMA controller,
569 * then start the DMA transaction
570 */
571 phy_writel(chan->phy, desc->first, DDADR);
572 phy_enable(chan->phy, chan->misaligned);
573 }
574
575 static void set_updater_desc(struct pxad_desc_sw *sw_desc,
576 unsigned long flags)
577 {
578 struct pxad_desc_hw *updater =
579 sw_desc->hw_desc[sw_desc->nb_desc - 1];
580 dma_addr_t dma = sw_desc->hw_desc[sw_desc->nb_desc - 2]->ddadr;
581
582 updater->ddadr = DDADR_STOP;
583 updater->dsadr = dma;
584 updater->dtadr = dma + 8;
585 updater->dcmd = PXA_DCMD_WIDTH4 | PXA_DCMD_BURST32 |
586 (PXA_DCMD_LENGTH & sizeof(u32));
587 if (flags & DMA_PREP_INTERRUPT)
588 updater->dcmd |= PXA_DCMD_ENDIRQEN;
589 if (sw_desc->cyclic)
590 sw_desc->hw_desc[sw_desc->nb_desc - 2]->ddadr = sw_desc->first;
591 }
592
593 static bool is_desc_completed(struct virt_dma_desc *vd)
594 {
595 struct pxad_desc_sw *sw_desc = to_pxad_sw_desc(vd);
596 struct pxad_desc_hw *updater =
597 sw_desc->hw_desc[sw_desc->nb_desc - 1];
598
599 return updater->dtadr != (updater->dsadr + 8);
600 }
601
602 static void pxad_desc_chain(struct virt_dma_desc *vd1,
603 struct virt_dma_desc *vd2)
604 {
605 struct pxad_desc_sw *desc1 = to_pxad_sw_desc(vd1);
606 struct pxad_desc_sw *desc2 = to_pxad_sw_desc(vd2);
607 dma_addr_t dma_to_chain;
608
609 dma_to_chain = desc2->first;
610 desc1->hw_desc[desc1->nb_desc - 1]->ddadr = dma_to_chain;
611 }
612
613 static bool pxad_try_hotchain(struct virt_dma_chan *vc,
614 struct virt_dma_desc *vd)
615 {
616 struct virt_dma_desc *vd_last_issued = NULL;
617 struct pxad_chan *chan = to_pxad_chan(&vc->chan);
618
619 /*
620 * Attempt to hot chain the tx if the phy is still running. This is
621 * considered successful only if either the channel is still running
622 * after the chaining, or if the chained transfer is completed after
623 * having been hot chained.
624 * A change of alignment is not allowed, and forbids hotchaining.
625 */
626 if (is_chan_running(chan)) {
627 BUG_ON(list_empty(&vc->desc_issued));
628
629 if (!is_running_chan_misaligned(chan) &&
630 to_pxad_sw_desc(vd)->misaligned)
631 return false;
632
633 vd_last_issued = list_entry(vc->desc_issued.prev,
634 struct virt_dma_desc, node);
635 pxad_desc_chain(vd_last_issued, vd);
636 if (is_chan_running(chan) || is_desc_completed(vd_last_issued))
637 return true;
638 }
639
640 return false;
641 }
642
643 static unsigned int clear_chan_irq(struct pxad_phy *phy)
644 {
645 u32 dcsr;
646 u32 dint = readl(phy->base + DINT);
647
648 if (!(dint & BIT(phy->idx)))
649 return PXA_DCSR_RUN;
650
651 /* clear irq */
652 dcsr = phy_readl_relaxed(phy, DCSR);
653 phy_writel(phy, dcsr, DCSR);
654 if ((dcsr & PXA_DCSR_BUSERR) && (phy->vchan))
655 dev_warn(&phy->vchan->vc.chan.dev->device,
656 "%s(chan=%p): PXA_DCSR_BUSERR\n",
657 __func__, &phy->vchan);
658
659 return dcsr & ~PXA_DCSR_RUN;
660 }
661
662 static irqreturn_t pxad_chan_handler(int irq, void *dev_id)
663 {
664 struct pxad_phy *phy = dev_id;
665 struct pxad_chan *chan = phy->vchan;
666 struct virt_dma_desc *vd, *tmp;
667 unsigned int dcsr;
668 unsigned long flags;
669
670 BUG_ON(!chan);
671
672 dcsr = clear_chan_irq(phy);
673 if (dcsr & PXA_DCSR_RUN)
674 return IRQ_NONE;
675
676 spin_lock_irqsave(&chan->vc.lock, flags);
677 list_for_each_entry_safe(vd, tmp, &chan->vc.desc_issued, node) {
678 dev_dbg(&chan->vc.chan.dev->device,
679 "%s(): checking txd %p[%x]: completed=%d\n",
680 __func__, vd, vd->tx.cookie, is_desc_completed(vd));
681 if (to_pxad_sw_desc(vd)->cyclic) {
682 vchan_cyclic_callback(vd);
683 break;
684 }
685 if (is_desc_completed(vd)) {
686 list_del(&vd->node);
687 vchan_cookie_complete(vd);
688 } else {
689 break;
690 }
691 }
692
693 if (dcsr & PXA_DCSR_STOPSTATE) {
694 dev_dbg(&chan->vc.chan.dev->device,
695 "%s(): channel stopped, submitted_empty=%d issued_empty=%d",
696 __func__,
697 list_empty(&chan->vc.desc_submitted),
698 list_empty(&chan->vc.desc_issued));
699 phy_writel_relaxed(phy, dcsr & ~PXA_DCSR_STOPIRQEN, DCSR);
700
701 if (list_empty(&chan->vc.desc_issued)) {
702 chan->misaligned =
703 !list_empty(&chan->vc.desc_submitted);
704 } else {
705 vd = list_first_entry(&chan->vc.desc_issued,
706 struct virt_dma_desc, node);
707 pxad_launch_chan(chan, to_pxad_sw_desc(vd));
708 }
709 }
710 spin_unlock_irqrestore(&chan->vc.lock, flags);
711
712 return IRQ_HANDLED;
713 }
714
715 static irqreturn_t pxad_int_handler(int irq, void *dev_id)
716 {
717 struct pxad_device *pdev = dev_id;
718 struct pxad_phy *phy;
719 u32 dint = readl(pdev->base + DINT);
720 int i, ret = IRQ_NONE;
721
722 while (dint) {
723 i = __ffs(dint);
724 dint &= (dint - 1);
725 phy = &pdev->phys[i];
726 if ((i < 32) && (legacy_reserved & BIT(i)))
727 continue;
728 if (pxad_chan_handler(irq, phy) == IRQ_HANDLED)
729 ret = IRQ_HANDLED;
730 }
731
732 return ret;
733 }
734
735 static int pxad_alloc_chan_resources(struct dma_chan *dchan)
736 {
737 struct pxad_chan *chan = to_pxad_chan(dchan);
738 struct pxad_device *pdev = to_pxad_dev(chan->vc.chan.device);
739
740 if (chan->desc_pool)
741 return 1;
742
743 chan->desc_pool = dma_pool_create(dma_chan_name(dchan),
744 pdev->slave.dev,
745 sizeof(struct pxad_desc_hw),
746 __alignof__(struct pxad_desc_hw),
747 0);
748 if (!chan->desc_pool) {
749 dev_err(&chan->vc.chan.dev->device,
750 "%s(): unable to allocate descriptor pool\n",
751 __func__);
752 return -ENOMEM;
753 }
754
755 return 1;
756 }
757
758 static void pxad_free_chan_resources(struct dma_chan *dchan)
759 {
760 struct pxad_chan *chan = to_pxad_chan(dchan);
761
762 vchan_free_chan_resources(&chan->vc);
763 dma_pool_destroy(chan->desc_pool);
764 chan->desc_pool = NULL;
765
766 }
767
768 static void pxad_free_desc(struct virt_dma_desc *vd)
769 {
770 int i;
771 dma_addr_t dma;
772 struct pxad_desc_sw *sw_desc = to_pxad_sw_desc(vd);
773
774 BUG_ON(sw_desc->nb_desc == 0);
775 for (i = sw_desc->nb_desc - 1; i >= 0; i--) {
776 if (i > 0)
777 dma = sw_desc->hw_desc[i - 1]->ddadr;
778 else
779 dma = sw_desc->first;
780 dma_pool_free(sw_desc->desc_pool,
781 sw_desc->hw_desc[i], dma);
782 }
783 sw_desc->nb_desc = 0;
784 kfree(sw_desc);
785 }
786
787 static struct pxad_desc_sw *
788 pxad_alloc_desc(struct pxad_chan *chan, unsigned int nb_hw_desc)
789 {
790 struct pxad_desc_sw *sw_desc;
791 dma_addr_t dma;
792 int i;
793
794 sw_desc = kzalloc(sizeof(*sw_desc) +
795 nb_hw_desc * sizeof(struct pxad_desc_hw *),
796 GFP_NOWAIT);
797 if (!sw_desc)
798 return NULL;
799 sw_desc->desc_pool = chan->desc_pool;
800
801 for (i = 0; i < nb_hw_desc; i++) {
802 sw_desc->hw_desc[i] = dma_pool_alloc(sw_desc->desc_pool,
803 GFP_NOWAIT, &dma);
804 if (!sw_desc->hw_desc[i]) {
805 dev_err(&chan->vc.chan.dev->device,
806 "%s(): Couldn't allocate the %dth hw_desc from dma_pool %p\n",
807 __func__, i, sw_desc->desc_pool);
808 goto err;
809 }
810
811 if (i == 0)
812 sw_desc->first = dma;
813 else
814 sw_desc->hw_desc[i - 1]->ddadr = dma;
815 sw_desc->nb_desc++;
816 }
817
818 return sw_desc;
819 err:
820 pxad_free_desc(&sw_desc->vd);
821 return NULL;
822 }
823
824 static dma_cookie_t pxad_tx_submit(struct dma_async_tx_descriptor *tx)
825 {
826 struct virt_dma_chan *vc = to_virt_chan(tx->chan);
827 struct pxad_chan *chan = to_pxad_chan(&vc->chan);
828 struct virt_dma_desc *vd_chained = NULL,
829 *vd = container_of(tx, struct virt_dma_desc, tx);
830 dma_cookie_t cookie;
831 unsigned long flags;
832
833 set_updater_desc(to_pxad_sw_desc(vd), tx->flags);
834
835 spin_lock_irqsave(&vc->lock, flags);
836 cookie = dma_cookie_assign(tx);
837
838 if (list_empty(&vc->desc_submitted) && pxad_try_hotchain(vc, vd)) {
839 list_move_tail(&vd->node, &vc->desc_issued);
840 dev_dbg(&chan->vc.chan.dev->device,
841 "%s(): txd %p[%x]: submitted (hot linked)\n",
842 __func__, vd, cookie);
843 goto out;
844 }
845
846 /*
847 * Fallback to placing the tx in the submitted queue
848 */
849 if (!list_empty(&vc->desc_submitted)) {
850 vd_chained = list_entry(vc->desc_submitted.prev,
851 struct virt_dma_desc, node);
852 /*
853 * Only chain the descriptors if no new misalignment is
854 * introduced. If a new misalignment is chained, let the channel
855 * stop, and be relaunched in misalign mode from the irq
856 * handler.
857 */
858 if (chan->misaligned || !to_pxad_sw_desc(vd)->misaligned)
859 pxad_desc_chain(vd_chained, vd);
860 else
861 vd_chained = NULL;
862 }
863 dev_dbg(&chan->vc.chan.dev->device,
864 "%s(): txd %p[%x]: submitted (%s linked)\n",
865 __func__, vd, cookie, vd_chained ? "cold" : "not");
866 list_move_tail(&vd->node, &vc->desc_submitted);
867 chan->misaligned |= to_pxad_sw_desc(vd)->misaligned;
868
869 out:
870 spin_unlock_irqrestore(&vc->lock, flags);
871 return cookie;
872 }
873
874 static void pxad_issue_pending(struct dma_chan *dchan)
875 {
876 struct pxad_chan *chan = to_pxad_chan(dchan);
877 struct virt_dma_desc *vd_first;
878 unsigned long flags;
879
880 spin_lock_irqsave(&chan->vc.lock, flags);
881 if (list_empty(&chan->vc.desc_submitted))
882 goto out;
883
884 vd_first = list_first_entry(&chan->vc.desc_submitted,
885 struct virt_dma_desc, node);
886 dev_dbg(&chan->vc.chan.dev->device,
887 "%s(): txd %p[%x]", __func__, vd_first, vd_first->tx.cookie);
888
889 vchan_issue_pending(&chan->vc);
890 if (!pxad_try_hotchain(&chan->vc, vd_first))
891 pxad_launch_chan(chan, to_pxad_sw_desc(vd_first));
892 out:
893 spin_unlock_irqrestore(&chan->vc.lock, flags);
894 }
895
896 static inline struct dma_async_tx_descriptor *
897 pxad_tx_prep(struct virt_dma_chan *vc, struct virt_dma_desc *vd,
898 unsigned long tx_flags)
899 {
900 struct dma_async_tx_descriptor *tx;
901 struct pxad_chan *chan = container_of(vc, struct pxad_chan, vc);
902
903 INIT_LIST_HEAD(&vd->node);
904 tx = vchan_tx_prep(vc, vd, tx_flags);
905 tx->tx_submit = pxad_tx_submit;
906 dev_dbg(&chan->vc.chan.dev->device,
907 "%s(): vc=%p txd=%p[%x] flags=0x%lx\n", __func__,
908 vc, vd, vd->tx.cookie,
909 tx_flags);
910
911 return tx;
912 }
913
914 static void pxad_get_config(struct pxad_chan *chan,
915 enum dma_transfer_direction dir,
916 u32 *dcmd, u32 *dev_src, u32 *dev_dst)
917 {
918 u32 maxburst = 0, dev_addr = 0;
919 enum dma_slave_buswidth width = DMA_SLAVE_BUSWIDTH_UNDEFINED;
920 struct pxad_device *pdev = to_pxad_dev(chan->vc.chan.device);
921
922 *dcmd = 0;
923 if (dir == DMA_DEV_TO_MEM) {
924 maxburst = chan->cfg.src_maxburst;
925 width = chan->cfg.src_addr_width;
926 dev_addr = chan->cfg.src_addr;
927 *dev_src = dev_addr;
928 *dcmd |= PXA_DCMD_INCTRGADDR;
929 if (chan->drcmr <= pdev->nr_requestors)
930 *dcmd |= PXA_DCMD_FLOWSRC;
931 }
932 if (dir == DMA_MEM_TO_DEV) {
933 maxburst = chan->cfg.dst_maxburst;
934 width = chan->cfg.dst_addr_width;
935 dev_addr = chan->cfg.dst_addr;
936 *dev_dst = dev_addr;
937 *dcmd |= PXA_DCMD_INCSRCADDR;
938 if (chan->drcmr <= pdev->nr_requestors)
939 *dcmd |= PXA_DCMD_FLOWTRG;
940 }
941 if (dir == DMA_MEM_TO_MEM)
942 *dcmd |= PXA_DCMD_BURST32 | PXA_DCMD_INCTRGADDR |
943 PXA_DCMD_INCSRCADDR;
944
945 dev_dbg(&chan->vc.chan.dev->device,
946 "%s(): dev_addr=0x%x maxburst=%d width=%d dir=%d\n",
947 __func__, dev_addr, maxburst, width, dir);
948
949 if (width == DMA_SLAVE_BUSWIDTH_1_BYTE)
950 *dcmd |= PXA_DCMD_WIDTH1;
951 else if (width == DMA_SLAVE_BUSWIDTH_2_BYTES)
952 *dcmd |= PXA_DCMD_WIDTH2;
953 else if (width == DMA_SLAVE_BUSWIDTH_4_BYTES)
954 *dcmd |= PXA_DCMD_WIDTH4;
955
956 if (maxburst == 8)
957 *dcmd |= PXA_DCMD_BURST8;
958 else if (maxburst == 16)
959 *dcmd |= PXA_DCMD_BURST16;
960 else if (maxburst == 32)
961 *dcmd |= PXA_DCMD_BURST32;
962
963 /* FIXME: drivers should be ported over to use the filter
964 * function. Once that's done, the following two lines can
965 * be removed.
966 */
967 if (chan->cfg.slave_id)
968 chan->drcmr = chan->cfg.slave_id;
969 }
970
971 static struct dma_async_tx_descriptor *
972 pxad_prep_memcpy(struct dma_chan *dchan,
973 dma_addr_t dma_dst, dma_addr_t dma_src,
974 size_t len, unsigned long flags)
975 {
976 struct pxad_chan *chan = to_pxad_chan(dchan);
977 struct pxad_desc_sw *sw_desc;
978 struct pxad_desc_hw *hw_desc;
979 u32 dcmd;
980 unsigned int i, nb_desc = 0;
981 size_t copy;
982
983 if (!dchan || !len)
984 return NULL;
985
986 dev_dbg(&chan->vc.chan.dev->device,
987 "%s(): dma_dst=0x%lx dma_src=0x%lx len=%zu flags=%lx\n",
988 __func__, (unsigned long)dma_dst, (unsigned long)dma_src,
989 len, flags);
990 pxad_get_config(chan, DMA_MEM_TO_MEM, &dcmd, NULL, NULL);
991
992 nb_desc = DIV_ROUND_UP(len, PDMA_MAX_DESC_BYTES);
993 sw_desc = pxad_alloc_desc(chan, nb_desc + 1);
994 if (!sw_desc)
995 return NULL;
996 sw_desc->len = len;
997
998 if (!IS_ALIGNED(dma_src, 1 << PDMA_ALIGNMENT) ||
999 !IS_ALIGNED(dma_dst, 1 << PDMA_ALIGNMENT))
1000 sw_desc->misaligned = true;
1001
1002 i = 0;
1003 do {
1004 hw_desc = sw_desc->hw_desc[i++];
1005 copy = min_t(size_t, len, PDMA_MAX_DESC_BYTES);
1006 hw_desc->dcmd = dcmd | (PXA_DCMD_LENGTH & copy);
1007 hw_desc->dsadr = dma_src;
1008 hw_desc->dtadr = dma_dst;
1009 len -= copy;
1010 dma_src += copy;
1011 dma_dst += copy;
1012 } while (len);
1013 set_updater_desc(sw_desc, flags);
1014
1015 return pxad_tx_prep(&chan->vc, &sw_desc->vd, flags);
1016 }
1017
1018 static struct dma_async_tx_descriptor *
1019 pxad_prep_slave_sg(struct dma_chan *dchan, struct scatterlist *sgl,
1020 unsigned int sg_len, enum dma_transfer_direction dir,
1021 unsigned long flags, void *context)
1022 {
1023 struct pxad_chan *chan = to_pxad_chan(dchan);
1024 struct pxad_desc_sw *sw_desc;
1025 size_t len, avail;
1026 struct scatterlist *sg;
1027 dma_addr_t dma;
1028 u32 dcmd, dsadr = 0, dtadr = 0;
1029 unsigned int nb_desc = 0, i, j = 0;
1030
1031 if ((sgl == NULL) || (sg_len == 0))
1032 return NULL;
1033
1034 pxad_get_config(chan, dir, &dcmd, &dsadr, &dtadr);
1035 dev_dbg(&chan->vc.chan.dev->device,
1036 "%s(): dir=%d flags=%lx\n", __func__, dir, flags);
1037
1038 for_each_sg(sgl, sg, sg_len, i)
1039 nb_desc += DIV_ROUND_UP(sg_dma_len(sg), PDMA_MAX_DESC_BYTES);
1040 sw_desc = pxad_alloc_desc(chan, nb_desc + 1);
1041 if (!sw_desc)
1042 return NULL;
1043
1044 for_each_sg(sgl, sg, sg_len, i) {
1045 dma = sg_dma_address(sg);
1046 avail = sg_dma_len(sg);
1047 sw_desc->len += avail;
1048
1049 do {
1050 len = min_t(size_t, avail, PDMA_MAX_DESC_BYTES);
1051 if (dma & 0x7)
1052 sw_desc->misaligned = true;
1053
1054 sw_desc->hw_desc[j]->dcmd =
1055 dcmd | (PXA_DCMD_LENGTH & len);
1056 sw_desc->hw_desc[j]->dsadr = dsadr ? dsadr : dma;
1057 sw_desc->hw_desc[j++]->dtadr = dtadr ? dtadr : dma;
1058
1059 dma += len;
1060 avail -= len;
1061 } while (avail);
1062 }
1063 set_updater_desc(sw_desc, flags);
1064
1065 return pxad_tx_prep(&chan->vc, &sw_desc->vd, flags);
1066 }
1067
1068 static struct dma_async_tx_descriptor *
1069 pxad_prep_dma_cyclic(struct dma_chan *dchan,
1070 dma_addr_t buf_addr, size_t len, size_t period_len,
1071 enum dma_transfer_direction dir, unsigned long flags)
1072 {
1073 struct pxad_chan *chan = to_pxad_chan(dchan);
1074 struct pxad_desc_sw *sw_desc;
1075 struct pxad_desc_hw **phw_desc;
1076 dma_addr_t dma;
1077 u32 dcmd, dsadr = 0, dtadr = 0;
1078 unsigned int nb_desc = 0;
1079
1080 if (!dchan || !len || !period_len)
1081 return NULL;
1082 if ((dir != DMA_DEV_TO_MEM) && (dir != DMA_MEM_TO_DEV)) {
1083 dev_err(&chan->vc.chan.dev->device,
1084 "Unsupported direction for cyclic DMA\n");
1085 return NULL;
1086 }
1087 /* the buffer length must be a multiple of period_len */
1088 if (len % period_len != 0 || period_len > PDMA_MAX_DESC_BYTES ||
1089 !IS_ALIGNED(period_len, 1 << PDMA_ALIGNMENT))
1090 return NULL;
1091
1092 pxad_get_config(chan, dir, &dcmd, &dsadr, &dtadr);
1093 dcmd |= PXA_DCMD_ENDIRQEN | (PXA_DCMD_LENGTH & period_len);
1094 dev_dbg(&chan->vc.chan.dev->device,
1095 "%s(): buf_addr=0x%lx len=%zu period=%zu dir=%d flags=%lx\n",
1096 __func__, (unsigned long)buf_addr, len, period_len, dir, flags);
1097
1098 nb_desc = DIV_ROUND_UP(period_len, PDMA_MAX_DESC_BYTES);
1099 nb_desc *= DIV_ROUND_UP(len, period_len);
1100 sw_desc = pxad_alloc_desc(chan, nb_desc + 1);
1101 if (!sw_desc)
1102 return NULL;
1103 sw_desc->cyclic = true;
1104 sw_desc->len = len;
1105
1106 phw_desc = sw_desc->hw_desc;
1107 dma = buf_addr;
1108 do {
1109 phw_desc[0]->dsadr = dsadr ? dsadr : dma;
1110 phw_desc[0]->dtadr = dtadr ? dtadr : dma;
1111 phw_desc[0]->dcmd = dcmd;
1112 phw_desc++;
1113 dma += period_len;
1114 len -= period_len;
1115 } while (len);
1116 set_updater_desc(sw_desc, flags);
1117
1118 return pxad_tx_prep(&chan->vc, &sw_desc->vd, flags);
1119 }
1120
1121 static int pxad_config(struct dma_chan *dchan,
1122 struct dma_slave_config *cfg)
1123 {
1124 struct pxad_chan *chan = to_pxad_chan(dchan);
1125
1126 if (!dchan)
1127 return -EINVAL;
1128
1129 chan->cfg = *cfg;
1130 return 0;
1131 }
1132
1133 static int pxad_terminate_all(struct dma_chan *dchan)
1134 {
1135 struct pxad_chan *chan = to_pxad_chan(dchan);
1136 struct pxad_device *pdev = to_pxad_dev(chan->vc.chan.device);
1137 struct virt_dma_desc *vd = NULL;
1138 unsigned long flags;
1139 struct pxad_phy *phy;
1140 LIST_HEAD(head);
1141
1142 dev_dbg(&chan->vc.chan.dev->device,
1143 "%s(): vchan %p: terminate all\n", __func__, &chan->vc);
1144
1145 spin_lock_irqsave(&chan->vc.lock, flags);
1146 vchan_get_all_descriptors(&chan->vc, &head);
1147
1148 list_for_each_entry(vd, &head, node) {
1149 dev_dbg(&chan->vc.chan.dev->device,
1150 "%s(): cancelling txd %p[%x] (completed=%d)", __func__,
1151 vd, vd->tx.cookie, is_desc_completed(vd));
1152 }
1153
1154 phy = chan->phy;
1155 if (phy) {
1156 phy_disable(chan->phy);
1157 pxad_free_phy(chan);
1158 chan->phy = NULL;
1159 spin_lock(&pdev->phy_lock);
1160 phy->vchan = NULL;
1161 spin_unlock(&pdev->phy_lock);
1162 }
1163 spin_unlock_irqrestore(&chan->vc.lock, flags);
1164 vchan_dma_desc_free_list(&chan->vc, &head);
1165
1166 return 0;
1167 }
1168
1169 static unsigned int pxad_residue(struct pxad_chan *chan,
1170 dma_cookie_t cookie)
1171 {
1172 struct virt_dma_desc *vd = NULL;
1173 struct pxad_desc_sw *sw_desc = NULL;
1174 struct pxad_desc_hw *hw_desc = NULL;
1175 u32 curr, start, len, end, residue = 0;
1176 unsigned long flags;
1177 bool passed = false;
1178 int i;
1179
1180 /*
1181 * If the channel does not have a phy pointer anymore, it has already
1182 * been completed. Therefore, its residue is 0.
1183 */
1184 if (!chan->phy)
1185 return 0;
1186
1187 spin_lock_irqsave(&chan->vc.lock, flags);
1188
1189 vd = vchan_find_desc(&chan->vc, cookie);
1190 if (!vd)
1191 goto out;
1192
1193 sw_desc = to_pxad_sw_desc(vd);
1194 if (sw_desc->hw_desc[0]->dcmd & PXA_DCMD_INCSRCADDR)
1195 curr = phy_readl_relaxed(chan->phy, DSADR);
1196 else
1197 curr = phy_readl_relaxed(chan->phy, DTADR);
1198
1199 /*
1200 * curr has to be actually read before checking descriptor
1201 * completion, so that a curr inside a status updater
1202 * descriptor implies the following test returns true, and
1203 * preventing reordering of curr load and the test.
1204 */
1205 rmb();
1206 if (is_desc_completed(vd))
1207 goto out;
1208
1209 for (i = 0; i < sw_desc->nb_desc - 1; i++) {
1210 hw_desc = sw_desc->hw_desc[i];
1211 if (sw_desc->hw_desc[0]->dcmd & PXA_DCMD_INCSRCADDR)
1212 start = hw_desc->dsadr;
1213 else
1214 start = hw_desc->dtadr;
1215 len = hw_desc->dcmd & PXA_DCMD_LENGTH;
1216 end = start + len;
1217
1218 /*
1219 * 'passed' will be latched once we found the descriptor
1220 * which lies inside the boundaries of the curr
1221 * pointer. All descriptors that occur in the list
1222 * _after_ we found that partially handled descriptor
1223 * are still to be processed and are hence added to the
1224 * residual bytes counter.
1225 */
1226
1227 if (passed) {
1228 residue += len;
1229 } else if (curr >= start && curr <= end) {
1230 residue += end - curr;
1231 passed = true;
1232 }
1233 }
1234 if (!passed)
1235 residue = sw_desc->len;
1236
1237 out:
1238 spin_unlock_irqrestore(&chan->vc.lock, flags);
1239 dev_dbg(&chan->vc.chan.dev->device,
1240 "%s(): txd %p[%x] sw_desc=%p: %d\n",
1241 __func__, vd, cookie, sw_desc, residue);
1242 return residue;
1243 }
1244
1245 static enum dma_status pxad_tx_status(struct dma_chan *dchan,
1246 dma_cookie_t cookie,
1247 struct dma_tx_state *txstate)
1248 {
1249 struct pxad_chan *chan = to_pxad_chan(dchan);
1250 enum dma_status ret;
1251
1252 ret = dma_cookie_status(dchan, cookie, txstate);
1253 if (likely(txstate && (ret != DMA_ERROR)))
1254 dma_set_residue(txstate, pxad_residue(chan, cookie));
1255
1256 return ret;
1257 }
1258
1259 static void pxad_free_channels(struct dma_device *dmadev)
1260 {
1261 struct pxad_chan *c, *cn;
1262
1263 list_for_each_entry_safe(c, cn, &dmadev->channels,
1264 vc.chan.device_node) {
1265 list_del(&c->vc.chan.device_node);
1266 tasklet_kill(&c->vc.task);
1267 }
1268 }
1269
1270 static int pxad_remove(struct platform_device *op)
1271 {
1272 struct pxad_device *pdev = platform_get_drvdata(op);
1273
1274 pxad_cleanup_debugfs(pdev);
1275 pxad_free_channels(&pdev->slave);
1276 dma_async_device_unregister(&pdev->slave);
1277 return 0;
1278 }
1279
1280 static int pxad_init_phys(struct platform_device *op,
1281 struct pxad_device *pdev,
1282 unsigned int nb_phy_chans)
1283 {
1284 int irq0, irq, nr_irq = 0, i, ret;
1285 struct pxad_phy *phy;
1286
1287 irq0 = platform_get_irq(op, 0);
1288 if (irq0 < 0)
1289 return irq0;
1290
1291 pdev->phys = devm_kcalloc(&op->dev, nb_phy_chans,
1292 sizeof(pdev->phys[0]), GFP_KERNEL);
1293 if (!pdev->phys)
1294 return -ENOMEM;
1295
1296 for (i = 0; i < nb_phy_chans; i++)
1297 if (platform_get_irq(op, i) > 0)
1298 nr_irq++;
1299
1300 for (i = 0; i < nb_phy_chans; i++) {
1301 phy = &pdev->phys[i];
1302 phy->base = pdev->base;
1303 phy->idx = i;
1304 irq = platform_get_irq(op, i);
1305 if ((nr_irq > 1) && (irq > 0))
1306 ret = devm_request_irq(&op->dev, irq,
1307 pxad_chan_handler,
1308 IRQF_SHARED, "pxa-dma", phy);
1309 if ((nr_irq == 1) && (i == 0))
1310 ret = devm_request_irq(&op->dev, irq0,
1311 pxad_int_handler,
1312 IRQF_SHARED, "pxa-dma", pdev);
1313 if (ret) {
1314 dev_err(pdev->slave.dev,
1315 "%s(): can't request irq %d:%d\n", __func__,
1316 irq, ret);
1317 return ret;
1318 }
1319 }
1320
1321 return 0;
1322 }
1323
1324 static const struct of_device_id const pxad_dt_ids[] = {
1325 { .compatible = "marvell,pdma-1.0", },
1326 {}
1327 };
1328 MODULE_DEVICE_TABLE(of, pxad_dt_ids);
1329
1330 static struct dma_chan *pxad_dma_xlate(struct of_phandle_args *dma_spec,
1331 struct of_dma *ofdma)
1332 {
1333 struct pxad_device *d = ofdma->of_dma_data;
1334 struct dma_chan *chan;
1335
1336 chan = dma_get_any_slave_channel(&d->slave);
1337 if (!chan)
1338 return NULL;
1339
1340 to_pxad_chan(chan)->drcmr = dma_spec->args[0];
1341 to_pxad_chan(chan)->prio = dma_spec->args[1];
1342
1343 return chan;
1344 }
1345
1346 static int pxad_init_dmadev(struct platform_device *op,
1347 struct pxad_device *pdev,
1348 unsigned int nr_phy_chans,
1349 unsigned int nr_requestors)
1350 {
1351 int ret;
1352 unsigned int i;
1353 struct pxad_chan *c;
1354
1355 pdev->nr_chans = nr_phy_chans;
1356 pdev->nr_requestors = nr_requestors;
1357 INIT_LIST_HEAD(&pdev->slave.channels);
1358 pdev->slave.device_alloc_chan_resources = pxad_alloc_chan_resources;
1359 pdev->slave.device_free_chan_resources = pxad_free_chan_resources;
1360 pdev->slave.device_tx_status = pxad_tx_status;
1361 pdev->slave.device_issue_pending = pxad_issue_pending;
1362 pdev->slave.device_config = pxad_config;
1363 pdev->slave.device_terminate_all = pxad_terminate_all;
1364
1365 if (op->dev.coherent_dma_mask)
1366 dma_set_mask(&op->dev, op->dev.coherent_dma_mask);
1367 else
1368 dma_set_mask(&op->dev, DMA_BIT_MASK(32));
1369
1370 ret = pxad_init_phys(op, pdev, nr_phy_chans);
1371 if (ret)
1372 return ret;
1373
1374 for (i = 0; i < nr_phy_chans; i++) {
1375 c = devm_kzalloc(&op->dev, sizeof(*c), GFP_KERNEL);
1376 if (!c)
1377 return -ENOMEM;
1378 c->vc.desc_free = pxad_free_desc;
1379 vchan_init(&c->vc, &pdev->slave);
1380 }
1381
1382 return dma_async_device_register(&pdev->slave);
1383 }
1384
1385 static int pxad_probe(struct platform_device *op)
1386 {
1387 struct pxad_device *pdev;
1388 const struct of_device_id *of_id;
1389 struct mmp_dma_platdata *pdata = dev_get_platdata(&op->dev);
1390 struct resource *iores;
1391 int ret, dma_channels = 0, nb_requestors = 0;
1392 const enum dma_slave_buswidth widths =
1393 DMA_SLAVE_BUSWIDTH_1_BYTE | DMA_SLAVE_BUSWIDTH_2_BYTES |
1394 DMA_SLAVE_BUSWIDTH_4_BYTES;
1395
1396 pdev = devm_kzalloc(&op->dev, sizeof(*pdev), GFP_KERNEL);
1397 if (!pdev)
1398 return -ENOMEM;
1399
1400 spin_lock_init(&pdev->phy_lock);
1401
1402 iores = platform_get_resource(op, IORESOURCE_MEM, 0);
1403 pdev->base = devm_ioremap_resource(&op->dev, iores);
1404 if (IS_ERR(pdev->base))
1405 return PTR_ERR(pdev->base);
1406
1407 of_id = of_match_device(pxad_dt_ids, &op->dev);
1408 if (of_id) {
1409 of_property_read_u32(op->dev.of_node, "#dma-channels",
1410 &dma_channels);
1411 ret = of_property_read_u32(op->dev.of_node, "#dma-requests",
1412 &nb_requestors);
1413 if (ret) {
1414 dev_warn(pdev->slave.dev,
1415 "#dma-requests set to default 32 as missing in OF: %d",
1416 ret);
1417 nb_requestors = 32;
1418 };
1419 } else if (pdata && pdata->dma_channels) {
1420 dma_channels = pdata->dma_channels;
1421 nb_requestors = pdata->nb_requestors;
1422 } else {
1423 dma_channels = 32; /* default 32 channel */
1424 }
1425
1426 dma_cap_set(DMA_SLAVE, pdev->slave.cap_mask);
1427 dma_cap_set(DMA_MEMCPY, pdev->slave.cap_mask);
1428 dma_cap_set(DMA_CYCLIC, pdev->slave.cap_mask);
1429 dma_cap_set(DMA_PRIVATE, pdev->slave.cap_mask);
1430 pdev->slave.device_prep_dma_memcpy = pxad_prep_memcpy;
1431 pdev->slave.device_prep_slave_sg = pxad_prep_slave_sg;
1432 pdev->slave.device_prep_dma_cyclic = pxad_prep_dma_cyclic;
1433
1434 pdev->slave.copy_align = PDMA_ALIGNMENT;
1435 pdev->slave.src_addr_widths = widths;
1436 pdev->slave.dst_addr_widths = widths;
1437 pdev->slave.directions = BIT(DMA_MEM_TO_DEV) | BIT(DMA_DEV_TO_MEM);
1438 pdev->slave.residue_granularity = DMA_RESIDUE_GRANULARITY_DESCRIPTOR;
1439 pdev->slave.descriptor_reuse = true;
1440
1441 pdev->slave.dev = &op->dev;
1442 ret = pxad_init_dmadev(op, pdev, dma_channels, nb_requestors);
1443 if (ret) {
1444 dev_err(pdev->slave.dev, "unable to register\n");
1445 return ret;
1446 }
1447
1448 if (op->dev.of_node) {
1449 /* Device-tree DMA controller registration */
1450 ret = of_dma_controller_register(op->dev.of_node,
1451 pxad_dma_xlate, pdev);
1452 if (ret < 0) {
1453 dev_err(pdev->slave.dev,
1454 "of_dma_controller_register failed\n");
1455 return ret;
1456 }
1457 }
1458
1459 platform_set_drvdata(op, pdev);
1460 pxad_init_debugfs(pdev);
1461 dev_info(pdev->slave.dev, "initialized %d channels on %d requestors\n",
1462 dma_channels, nb_requestors);
1463 return 0;
1464 }
1465
1466 static const struct platform_device_id pxad_id_table[] = {
1467 { "pxa-dma", },
1468 { },
1469 };
1470
1471 static struct platform_driver pxad_driver = {
1472 .driver = {
1473 .name = "pxa-dma",
1474 .of_match_table = pxad_dt_ids,
1475 },
1476 .id_table = pxad_id_table,
1477 .probe = pxad_probe,
1478 .remove = pxad_remove,
1479 };
1480
1481 bool pxad_filter_fn(struct dma_chan *chan, void *param)
1482 {
1483 struct pxad_chan *c = to_pxad_chan(chan);
1484 struct pxad_param *p = param;
1485
1486 if (chan->device->dev->driver != &pxad_driver.driver)
1487 return false;
1488
1489 c->drcmr = p->drcmr;
1490 c->prio = p->prio;
1491
1492 return true;
1493 }
1494 EXPORT_SYMBOL_GPL(pxad_filter_fn);
1495
1496 int pxad_toggle_reserved_channel(int legacy_channel)
1497 {
1498 if (legacy_unavailable & (BIT(legacy_channel)))
1499 return -EBUSY;
1500 legacy_reserved ^= BIT(legacy_channel);
1501 return 0;
1502 }
1503 EXPORT_SYMBOL_GPL(pxad_toggle_reserved_channel);
1504
1505 module_platform_driver(pxad_driver);
1506
1507 MODULE_DESCRIPTION("Marvell PXA Peripheral DMA Driver");
1508 MODULE_AUTHOR("Robert Jarzmik <robert.jarzmik@free.fr>");
1509 MODULE_LICENSE("GPL v2");
Linux kernel - Deliverables
This page took 0.11249 seconds and 5 git commands to generate.