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1/*
2 * Driver for the TXx9 SoC DMA Controller
3 *
4 * Copyright (C) 2009 Atsushi Nemoto
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10#include <linux/dma-mapping.h>
11#include <linux/init.h>
12#include <linux/interrupt.h>
13#include <linux/io.h>
14#include <linux/module.h>
15#include <linux/platform_device.h>
16#include <linux/slab.h>
17#include <linux/scatterlist.h>
18
19#include "dmaengine.h"
20#include "txx9dmac.h"
21
22static struct txx9dmac_chan *to_txx9dmac_chan(struct dma_chan *chan)
23{
24 return container_of(chan, struct txx9dmac_chan, chan);
25}
26
27static struct txx9dmac_cregs __iomem *__dma_regs(const struct txx9dmac_chan *dc)
28{
29 return dc->ch_regs;
30}
31
32static struct txx9dmac_cregs32 __iomem *__dma_regs32(
33 const struct txx9dmac_chan *dc)
34{
35 return dc->ch_regs;
36}
37
38#define channel64_readq(dc, name) \
39 __raw_readq(&(__dma_regs(dc)->name))
40#define channel64_writeq(dc, name, val) \
41 __raw_writeq((val), &(__dma_regs(dc)->name))
42#define channel64_readl(dc, name) \
43 __raw_readl(&(__dma_regs(dc)->name))
44#define channel64_writel(dc, name, val) \
45 __raw_writel((val), &(__dma_regs(dc)->name))
46
47#define channel32_readl(dc, name) \
48 __raw_readl(&(__dma_regs32(dc)->name))
49#define channel32_writel(dc, name, val) \
50 __raw_writel((val), &(__dma_regs32(dc)->name))
51
52#define channel_readq(dc, name) channel64_readq(dc, name)
53#define channel_writeq(dc, name, val) channel64_writeq(dc, name, val)
54#define channel_readl(dc, name) \
55 (is_dmac64(dc) ? \
56 channel64_readl(dc, name) : channel32_readl(dc, name))
57#define channel_writel(dc, name, val) \
58 (is_dmac64(dc) ? \
59 channel64_writel(dc, name, val) : channel32_writel(dc, name, val))
60
61static dma_addr_t channel64_read_CHAR(const struct txx9dmac_chan *dc)
62{
63 if (sizeof(__dma_regs(dc)->CHAR) == sizeof(u64))
64 return channel64_readq(dc, CHAR);
65 else
66 return channel64_readl(dc, CHAR);
67}
68
69static void channel64_write_CHAR(const struct txx9dmac_chan *dc, dma_addr_t val)
70{
71 if (sizeof(__dma_regs(dc)->CHAR) == sizeof(u64))
72 channel64_writeq(dc, CHAR, val);
73 else
74 channel64_writel(dc, CHAR, val);
75}
76
77static void channel64_clear_CHAR(const struct txx9dmac_chan *dc)
78{
79#if defined(CONFIG_32BIT) && !defined(CONFIG_64BIT_PHYS_ADDR)
80 channel64_writel(dc, CHAR, 0);
81 channel64_writel(dc, __pad_CHAR, 0);
82#else
83 channel64_writeq(dc, CHAR, 0);
84#endif
85}
86
87static dma_addr_t channel_read_CHAR(const struct txx9dmac_chan *dc)
88{
89 if (is_dmac64(dc))
90 return channel64_read_CHAR(dc);
91 else
92 return channel32_readl(dc, CHAR);
93}
94
95static void channel_write_CHAR(const struct txx9dmac_chan *dc, dma_addr_t val)
96{
97 if (is_dmac64(dc))
98 channel64_write_CHAR(dc, val);
99 else
100 channel32_writel(dc, CHAR, val);
101}
102
103static struct txx9dmac_regs __iomem *__txx9dmac_regs(
104 const struct txx9dmac_dev *ddev)
105{
106 return ddev->regs;
107}
108
109static struct txx9dmac_regs32 __iomem *__txx9dmac_regs32(
110 const struct txx9dmac_dev *ddev)
111{
112 return ddev->regs;
113}
114
115#define dma64_readl(ddev, name) \
116 __raw_readl(&(__txx9dmac_regs(ddev)->name))
117#define dma64_writel(ddev, name, val) \
118 __raw_writel((val), &(__txx9dmac_regs(ddev)->name))
119
120#define dma32_readl(ddev, name) \
121 __raw_readl(&(__txx9dmac_regs32(ddev)->name))
122#define dma32_writel(ddev, name, val) \
123 __raw_writel((val), &(__txx9dmac_regs32(ddev)->name))
124
125#define dma_readl(ddev, name) \
126 (__is_dmac64(ddev) ? \
127 dma64_readl(ddev, name) : dma32_readl(ddev, name))
128#define dma_writel(ddev, name, val) \
129 (__is_dmac64(ddev) ? \
130 dma64_writel(ddev, name, val) : dma32_writel(ddev, name, val))
131
132static struct device *chan2dev(struct dma_chan *chan)
133{
134 return &chan->dev->device;
135}
136static struct device *chan2parent(struct dma_chan *chan)
137{
138 return chan->dev->device.parent;
139}
140
141static struct txx9dmac_desc *
142txd_to_txx9dmac_desc(struct dma_async_tx_descriptor *txd)
143{
144 return container_of(txd, struct txx9dmac_desc, txd);
145}
146
147static dma_addr_t desc_read_CHAR(const struct txx9dmac_chan *dc,
148 const struct txx9dmac_desc *desc)
149{
150 return is_dmac64(dc) ? desc->hwdesc.CHAR : desc->hwdesc32.CHAR;
151}
152
153static void desc_write_CHAR(const struct txx9dmac_chan *dc,
154 struct txx9dmac_desc *desc, dma_addr_t val)
155{
156 if (is_dmac64(dc))
157 desc->hwdesc.CHAR = val;
158 else
159 desc->hwdesc32.CHAR = val;
160}
161
162#define TXX9_DMA_MAX_COUNT 0x04000000
163
164#define TXX9_DMA_INITIAL_DESC_COUNT 64
165
166static struct txx9dmac_desc *txx9dmac_first_active(struct txx9dmac_chan *dc)
167{
168 return list_entry(dc->active_list.next,
169 struct txx9dmac_desc, desc_node);
170}
171
172static struct txx9dmac_desc *txx9dmac_last_active(struct txx9dmac_chan *dc)
173{
174 return list_entry(dc->active_list.prev,
175 struct txx9dmac_desc, desc_node);
176}
177
178static struct txx9dmac_desc *txx9dmac_first_queued(struct txx9dmac_chan *dc)
179{
180 return list_entry(dc->queue.next, struct txx9dmac_desc, desc_node);
181}
182
183static struct txx9dmac_desc *txx9dmac_last_child(struct txx9dmac_desc *desc)
184{
185 if (!list_empty(&desc->tx_list))
186 desc = list_entry(desc->tx_list.prev, typeof(*desc), desc_node);
187 return desc;
188}
189
190static dma_cookie_t txx9dmac_tx_submit(struct dma_async_tx_descriptor *tx);
191
192static struct txx9dmac_desc *txx9dmac_desc_alloc(struct txx9dmac_chan *dc,
193 gfp_t flags)
194{
195 struct txx9dmac_dev *ddev = dc->ddev;
196 struct txx9dmac_desc *desc;
197
198 desc = kzalloc(sizeof(*desc), flags);
199 if (!desc)
200 return NULL;
201 INIT_LIST_HEAD(&desc->tx_list);
202 dma_async_tx_descriptor_init(&desc->txd, &dc->chan);
203 desc->txd.tx_submit = txx9dmac_tx_submit;
204 /* txd.flags will be overwritten in prep funcs */
205 desc->txd.flags = DMA_CTRL_ACK;
206 desc->txd.phys = dma_map_single(chan2parent(&dc->chan), &desc->hwdesc,
207 ddev->descsize, DMA_TO_DEVICE);
208 return desc;
209}
210
211static struct txx9dmac_desc *txx9dmac_desc_get(struct txx9dmac_chan *dc)
212{
213 struct txx9dmac_desc *desc, *_desc;
214 struct txx9dmac_desc *ret = NULL;
215 unsigned int i = 0;
216
217 spin_lock_bh(&dc->lock);
218 list_for_each_entry_safe(desc, _desc, &dc->free_list, desc_node) {
219 if (async_tx_test_ack(&desc->txd)) {
220 list_del(&desc->desc_node);
221 ret = desc;
222 break;
223 }
224 dev_dbg(chan2dev(&dc->chan), "desc %p not ACKed\n", desc);
225 i++;
226 }
227 spin_unlock_bh(&dc->lock);
228
229 dev_vdbg(chan2dev(&dc->chan), "scanned %u descriptors on freelist\n",
230 i);
231 if (!ret) {
232 ret = txx9dmac_desc_alloc(dc, GFP_ATOMIC);
233 if (ret) {
234 spin_lock_bh(&dc->lock);
235 dc->descs_allocated++;
236 spin_unlock_bh(&dc->lock);
237 } else
238 dev_err(chan2dev(&dc->chan),
239 "not enough descriptors available\n");
240 }
241 return ret;
242}
243
244static void txx9dmac_sync_desc_for_cpu(struct txx9dmac_chan *dc,
245 struct txx9dmac_desc *desc)
246{
247 struct txx9dmac_dev *ddev = dc->ddev;
248 struct txx9dmac_desc *child;
249
250 list_for_each_entry(child, &desc->tx_list, desc_node)
251 dma_sync_single_for_cpu(chan2parent(&dc->chan),
252 child->txd.phys, ddev->descsize,
253 DMA_TO_DEVICE);
254 dma_sync_single_for_cpu(chan2parent(&dc->chan),
255 desc->txd.phys, ddev->descsize,
256 DMA_TO_DEVICE);
257}
258
259/*
260 * Move a descriptor, including any children, to the free list.
261 * `desc' must not be on any lists.
262 */
263static void txx9dmac_desc_put(struct txx9dmac_chan *dc,
264 struct txx9dmac_desc *desc)
265{
266 if (desc) {
267 struct txx9dmac_desc *child;
268
269 txx9dmac_sync_desc_for_cpu(dc, desc);
270
271 spin_lock_bh(&dc->lock);
272 list_for_each_entry(child, &desc->tx_list, desc_node)
273 dev_vdbg(chan2dev(&dc->chan),
274 "moving child desc %p to freelist\n",
275 child);
276 list_splice_init(&desc->tx_list, &dc->free_list);
277 dev_vdbg(chan2dev(&dc->chan), "moving desc %p to freelist\n",
278 desc);
279 list_add(&desc->desc_node, &dc->free_list);
280 spin_unlock_bh(&dc->lock);
281 }
282}
283
284/*----------------------------------------------------------------------*/
285
286static void txx9dmac_dump_regs(struct txx9dmac_chan *dc)
287{
288 if (is_dmac64(dc))
289 dev_err(chan2dev(&dc->chan),
290 " CHAR: %#llx SAR: %#llx DAR: %#llx CNTR: %#x"
291 " SAIR: %#x DAIR: %#x CCR: %#x CSR: %#x\n",
292 (u64)channel64_read_CHAR(dc),
293 channel64_readq(dc, SAR),
294 channel64_readq(dc, DAR),
295 channel64_readl(dc, CNTR),
296 channel64_readl(dc, SAIR),
297 channel64_readl(dc, DAIR),
298 channel64_readl(dc, CCR),
299 channel64_readl(dc, CSR));
300 else
301 dev_err(chan2dev(&dc->chan),
302 " CHAR: %#x SAR: %#x DAR: %#x CNTR: %#x"
303 " SAIR: %#x DAIR: %#x CCR: %#x CSR: %#x\n",
304 channel32_readl(dc, CHAR),
305 channel32_readl(dc, SAR),
306 channel32_readl(dc, DAR),
307 channel32_readl(dc, CNTR),
308 channel32_readl(dc, SAIR),
309 channel32_readl(dc, DAIR),
310 channel32_readl(dc, CCR),
311 channel32_readl(dc, CSR));
312}
313
314static void txx9dmac_reset_chan(struct txx9dmac_chan *dc)
315{
316 channel_writel(dc, CCR, TXX9_DMA_CCR_CHRST);
317 if (is_dmac64(dc)) {
318 channel64_clear_CHAR(dc);
319 channel_writeq(dc, SAR, 0);
320 channel_writeq(dc, DAR, 0);
321 } else {
322 channel_writel(dc, CHAR, 0);
323 channel_writel(dc, SAR, 0);
324 channel_writel(dc, DAR, 0);
325 }
326 channel_writel(dc, CNTR, 0);
327 channel_writel(dc, SAIR, 0);
328 channel_writel(dc, DAIR, 0);
329 channel_writel(dc, CCR, 0);
330 mmiowb();
331}
332
333/* Called with dc->lock held and bh disabled */
334static void txx9dmac_dostart(struct txx9dmac_chan *dc,
335 struct txx9dmac_desc *first)
336{
337 struct txx9dmac_slave *ds = dc->chan.private;
338 u32 sai, dai;
339
340 dev_vdbg(chan2dev(&dc->chan), "dostart %u %p\n",
341 first->txd.cookie, first);
342 /* ASSERT: channel is idle */
343 if (channel_readl(dc, CSR) & TXX9_DMA_CSR_XFACT) {
344 dev_err(chan2dev(&dc->chan),
345 "BUG: Attempted to start non-idle channel\n");
346 txx9dmac_dump_regs(dc);
347 /* The tasklet will hopefully advance the queue... */
348 return;
349 }
350
351 if (is_dmac64(dc)) {
352 channel64_writel(dc, CNTR, 0);
353 channel64_writel(dc, CSR, 0xffffffff);
354 if (ds) {
355 if (ds->tx_reg) {
356 sai = ds->reg_width;
357 dai = 0;
358 } else {
359 sai = 0;
360 dai = ds->reg_width;
361 }
362 } else {
363 sai = 8;
364 dai = 8;
365 }
366 channel64_writel(dc, SAIR, sai);
367 channel64_writel(dc, DAIR, dai);
368 /* All 64-bit DMAC supports SMPCHN */
369 channel64_writel(dc, CCR, dc->ccr);
370 /* Writing a non zero value to CHAR will assert XFACT */
371 channel64_write_CHAR(dc, first->txd.phys);
372 } else {
373 channel32_writel(dc, CNTR, 0);
374 channel32_writel(dc, CSR, 0xffffffff);
375 if (ds) {
376 if (ds->tx_reg) {
377 sai = ds->reg_width;
378 dai = 0;
379 } else {
380 sai = 0;
381 dai = ds->reg_width;
382 }
383 } else {
384 sai = 4;
385 dai = 4;
386 }
387 channel32_writel(dc, SAIR, sai);
388 channel32_writel(dc, DAIR, dai);
389 if (txx9_dma_have_SMPCHN()) {
390 channel32_writel(dc, CCR, dc->ccr);
391 /* Writing a non zero value to CHAR will assert XFACT */
392 channel32_writel(dc, CHAR, first->txd.phys);
393 } else {
394 channel32_writel(dc, CHAR, first->txd.phys);
395 channel32_writel(dc, CCR, dc->ccr);
396 }
397 }
398}
399
400/*----------------------------------------------------------------------*/
401
402static void
403txx9dmac_descriptor_complete(struct txx9dmac_chan *dc,
404 struct txx9dmac_desc *desc)
405{
406 dma_async_tx_callback callback;
407 void *param;
408 struct dma_async_tx_descriptor *txd = &desc->txd;
409
410 dev_vdbg(chan2dev(&dc->chan), "descriptor %u %p complete\n",
411 txd->cookie, desc);
412
413 dma_cookie_complete(txd);
414 callback = txd->callback;
415 param = txd->callback_param;
416
417 txx9dmac_sync_desc_for_cpu(dc, desc);
418 list_splice_init(&desc->tx_list, &dc->free_list);
419 list_move(&desc->desc_node, &dc->free_list);
420
421 dma_descriptor_unmap(txd);
422 /*
423 * The API requires that no submissions are done from a
424 * callback, so we don't need to drop the lock here
425 */
426 if (callback)
427 callback(param);
428 dma_run_dependencies(txd);
429}
430
431static void txx9dmac_dequeue(struct txx9dmac_chan *dc, struct list_head *list)
432{
433 struct txx9dmac_dev *ddev = dc->ddev;
434 struct txx9dmac_desc *desc;
435 struct txx9dmac_desc *prev = NULL;
436
437 BUG_ON(!list_empty(list));
438 do {
439 desc = txx9dmac_first_queued(dc);
440 if (prev) {
441 desc_write_CHAR(dc, prev, desc->txd.phys);
442 dma_sync_single_for_device(chan2parent(&dc->chan),
443 prev->txd.phys, ddev->descsize,
444 DMA_TO_DEVICE);
445 }
446 prev = txx9dmac_last_child(desc);
447 list_move_tail(&desc->desc_node, list);
448 /* Make chain-completion interrupt happen */
449 if ((desc->txd.flags & DMA_PREP_INTERRUPT) &&
450 !txx9dmac_chan_INTENT(dc))
451 break;
452 } while (!list_empty(&dc->queue));
453}
454
455static void txx9dmac_complete_all(struct txx9dmac_chan *dc)
456{
457 struct txx9dmac_desc *desc, *_desc;
458 LIST_HEAD(list);
459
460 /*
461 * Submit queued descriptors ASAP, i.e. before we go through
462 * the completed ones.
463 */
464 list_splice_init(&dc->active_list, &list);
465 if (!list_empty(&dc->queue)) {
466 txx9dmac_dequeue(dc, &dc->active_list);
467 txx9dmac_dostart(dc, txx9dmac_first_active(dc));
468 }
469
470 list_for_each_entry_safe(desc, _desc, &list, desc_node)
471 txx9dmac_descriptor_complete(dc, desc);
472}
473
474static void txx9dmac_dump_desc(struct txx9dmac_chan *dc,
475 struct txx9dmac_hwdesc *desc)
476{
477 if (is_dmac64(dc)) {
478#ifdef TXX9_DMA_USE_SIMPLE_CHAIN
479 dev_crit(chan2dev(&dc->chan),
480 " desc: ch%#llx s%#llx d%#llx c%#x\n",
481 (u64)desc->CHAR, desc->SAR, desc->DAR, desc->CNTR);
482#else
483 dev_crit(chan2dev(&dc->chan),
484 " desc: ch%#llx s%#llx d%#llx c%#x"
485 " si%#x di%#x cc%#x cs%#x\n",
486 (u64)desc->CHAR, desc->SAR, desc->DAR, desc->CNTR,
487 desc->SAIR, desc->DAIR, desc->CCR, desc->CSR);
488#endif
489 } else {
490 struct txx9dmac_hwdesc32 *d = (struct txx9dmac_hwdesc32 *)desc;
491#ifdef TXX9_DMA_USE_SIMPLE_CHAIN
492 dev_crit(chan2dev(&dc->chan),
493 " desc: ch%#x s%#x d%#x c%#x\n",
494 d->CHAR, d->SAR, d->DAR, d->CNTR);
495#else
496 dev_crit(chan2dev(&dc->chan),
497 " desc: ch%#x s%#x d%#x c%#x"
498 " si%#x di%#x cc%#x cs%#x\n",
499 d->CHAR, d->SAR, d->DAR, d->CNTR,
500 d->SAIR, d->DAIR, d->CCR, d->CSR);
501#endif
502 }
503}
504
505static void txx9dmac_handle_error(struct txx9dmac_chan *dc, u32 csr)
506{
507 struct txx9dmac_desc *bad_desc;
508 struct txx9dmac_desc *child;
509 u32 errors;
510
511 /*
512 * The descriptor currently at the head of the active list is
513 * borked. Since we don't have any way to report errors, we'll
514 * just have to scream loudly and try to carry on.
515 */
516 dev_crit(chan2dev(&dc->chan), "Abnormal Chain Completion\n");
517 txx9dmac_dump_regs(dc);
518
519 bad_desc = txx9dmac_first_active(dc);
520 list_del_init(&bad_desc->desc_node);
521
522 /* Clear all error flags and try to restart the controller */
523 errors = csr & (TXX9_DMA_CSR_ABCHC |
524 TXX9_DMA_CSR_CFERR | TXX9_DMA_CSR_CHERR |
525 TXX9_DMA_CSR_DESERR | TXX9_DMA_CSR_SORERR);
526 channel_writel(dc, CSR, errors);
527
528 if (list_empty(&dc->active_list) && !list_empty(&dc->queue))
529 txx9dmac_dequeue(dc, &dc->active_list);
530 if (!list_empty(&dc->active_list))
531 txx9dmac_dostart(dc, txx9dmac_first_active(dc));
532
533 dev_crit(chan2dev(&dc->chan),
534 "Bad descriptor submitted for DMA! (cookie: %d)\n",
535 bad_desc->txd.cookie);
536 txx9dmac_dump_desc(dc, &bad_desc->hwdesc);
537 list_for_each_entry(child, &bad_desc->tx_list, desc_node)
538 txx9dmac_dump_desc(dc, &child->hwdesc);
539 /* Pretend the descriptor completed successfully */
540 txx9dmac_descriptor_complete(dc, bad_desc);
541}
542
543static void txx9dmac_scan_descriptors(struct txx9dmac_chan *dc)
544{
545 dma_addr_t chain;
546 struct txx9dmac_desc *desc, *_desc;
547 struct txx9dmac_desc *child;
548 u32 csr;
549
550 if (is_dmac64(dc)) {
551 chain = channel64_read_CHAR(dc);
552 csr = channel64_readl(dc, CSR);
553 channel64_writel(dc, CSR, csr);
554 } else {
555 chain = channel32_readl(dc, CHAR);
556 csr = channel32_readl(dc, CSR);
557 channel32_writel(dc, CSR, csr);
558 }
559 /* For dynamic chain, we should look at XFACT instead of NCHNC */
560 if (!(csr & (TXX9_DMA_CSR_XFACT | TXX9_DMA_CSR_ABCHC))) {
561 /* Everything we've submitted is done */
562 txx9dmac_complete_all(dc);
563 return;
564 }
565 if (!(csr & TXX9_DMA_CSR_CHNEN))
566 chain = 0; /* last descriptor of this chain */
567
568 dev_vdbg(chan2dev(&dc->chan), "scan_descriptors: char=%#llx\n",
569 (u64)chain);
570
571 list_for_each_entry_safe(desc, _desc, &dc->active_list, desc_node) {
572 if (desc_read_CHAR(dc, desc) == chain) {
573 /* This one is currently in progress */
574 if (csr & TXX9_DMA_CSR_ABCHC)
575 goto scan_done;
576 return;
577 }
578
579 list_for_each_entry(child, &desc->tx_list, desc_node)
580 if (desc_read_CHAR(dc, child) == chain) {
581 /* Currently in progress */
582 if (csr & TXX9_DMA_CSR_ABCHC)
583 goto scan_done;
584 return;
585 }
586
587 /*
588 * No descriptors so far seem to be in progress, i.e.
589 * this one must be done.
590 */
591 txx9dmac_descriptor_complete(dc, desc);
592 }
593scan_done:
594 if (csr & TXX9_DMA_CSR_ABCHC) {
595 txx9dmac_handle_error(dc, csr);
596 return;
597 }
598
599 dev_err(chan2dev(&dc->chan),
600 "BUG: All descriptors done, but channel not idle!\n");
601
602 /* Try to continue after resetting the channel... */
603 txx9dmac_reset_chan(dc);
604
605 if (!list_empty(&dc->queue)) {
606 txx9dmac_dequeue(dc, &dc->active_list);
607 txx9dmac_dostart(dc, txx9dmac_first_active(dc));
608 }
609}
610
611static void txx9dmac_chan_tasklet(unsigned long data)
612{
613 int irq;
614 u32 csr;
615 struct txx9dmac_chan *dc;
616
617 dc = (struct txx9dmac_chan *)data;
618 csr = channel_readl(dc, CSR);
619 dev_vdbg(chan2dev(&dc->chan), "tasklet: status=%x\n", csr);
620
621 spin_lock(&dc->lock);
622 if (csr & (TXX9_DMA_CSR_ABCHC | TXX9_DMA_CSR_NCHNC |
623 TXX9_DMA_CSR_NTRNFC))
624 txx9dmac_scan_descriptors(dc);
625 spin_unlock(&dc->lock);
626 irq = dc->irq;
627
628 enable_irq(irq);
629}
630
631static irqreturn_t txx9dmac_chan_interrupt(int irq, void *dev_id)
632{
633 struct txx9dmac_chan *dc = dev_id;
634
635 dev_vdbg(chan2dev(&dc->chan), "interrupt: status=%#x\n",
636 channel_readl(dc, CSR));
637
638 tasklet_schedule(&dc->tasklet);
639 /*
640 * Just disable the interrupts. We'll turn them back on in the
641 * softirq handler.
642 */
643 disable_irq_nosync(irq);
644
645 return IRQ_HANDLED;
646}
647
648static void txx9dmac_tasklet(unsigned long data)
649{
650 int irq;
651 u32 csr;
652 struct txx9dmac_chan *dc;
653
654 struct txx9dmac_dev *ddev = (struct txx9dmac_dev *)data;
655 u32 mcr;
656 int i;
657
658 mcr = dma_readl(ddev, MCR);
659 dev_vdbg(ddev->chan[0]->dma.dev, "tasklet: mcr=%x\n", mcr);
660 for (i = 0; i < TXX9_DMA_MAX_NR_CHANNELS; i++) {
661 if ((mcr >> (24 + i)) & 0x11) {
662 dc = ddev->chan[i];
663 csr = channel_readl(dc, CSR);
664 dev_vdbg(chan2dev(&dc->chan), "tasklet: status=%x\n",
665 csr);
666 spin_lock(&dc->lock);
667 if (csr & (TXX9_DMA_CSR_ABCHC | TXX9_DMA_CSR_NCHNC |
668 TXX9_DMA_CSR_NTRNFC))
669 txx9dmac_scan_descriptors(dc);
670 spin_unlock(&dc->lock);
671 }
672 }
673 irq = ddev->irq;
674
675 enable_irq(irq);
676}
677
678static irqreturn_t txx9dmac_interrupt(int irq, void *dev_id)
679{
680 struct txx9dmac_dev *ddev = dev_id;
681
682 dev_vdbg(ddev->chan[0]->dma.dev, "interrupt: status=%#x\n",
683 dma_readl(ddev, MCR));
684
685 tasklet_schedule(&ddev->tasklet);
686 /*
687 * Just disable the interrupts. We'll turn them back on in the
688 * softirq handler.
689 */
690 disable_irq_nosync(irq);
691
692 return IRQ_HANDLED;
693}
694
695/*----------------------------------------------------------------------*/
696
697static dma_cookie_t txx9dmac_tx_submit(struct dma_async_tx_descriptor *tx)
698{
699 struct txx9dmac_desc *desc = txd_to_txx9dmac_desc(tx);
700 struct txx9dmac_chan *dc = to_txx9dmac_chan(tx->chan);
701 dma_cookie_t cookie;
702
703 spin_lock_bh(&dc->lock);
704 cookie = dma_cookie_assign(tx);
705
706 dev_vdbg(chan2dev(tx->chan), "tx_submit: queued %u %p\n",
707 desc->txd.cookie, desc);
708
709 list_add_tail(&desc->desc_node, &dc->queue);
710 spin_unlock_bh(&dc->lock);
711
712 return cookie;
713}
714
715static struct dma_async_tx_descriptor *
716txx9dmac_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
717 size_t len, unsigned long flags)
718{
719 struct txx9dmac_chan *dc = to_txx9dmac_chan(chan);
720 struct txx9dmac_dev *ddev = dc->ddev;
721 struct txx9dmac_desc *desc;
722 struct txx9dmac_desc *first;
723 struct txx9dmac_desc *prev;
724 size_t xfer_count;
725 size_t offset;
726
727 dev_vdbg(chan2dev(chan), "prep_dma_memcpy d%#llx s%#llx l%#zx f%#lx\n",
728 (u64)dest, (u64)src, len, flags);
729
730 if (unlikely(!len)) {
731 dev_dbg(chan2dev(chan), "prep_dma_memcpy: length is zero!\n");
732 return NULL;
733 }
734
735 prev = first = NULL;
736
737 for (offset = 0; offset < len; offset += xfer_count) {
738 xfer_count = min_t(size_t, len - offset, TXX9_DMA_MAX_COUNT);
739 /*
740 * Workaround for ERT-TX49H2-033, ERT-TX49H3-020,
741 * ERT-TX49H4-016 (slightly conservative)
742 */
743 if (__is_dmac64(ddev)) {
744 if (xfer_count > 0x100 &&
745 (xfer_count & 0xff) >= 0xfa &&
746 (xfer_count & 0xff) <= 0xff)
747 xfer_count -= 0x20;
748 } else {
749 if (xfer_count > 0x80 &&
750 (xfer_count & 0x7f) >= 0x7e &&
751 (xfer_count & 0x7f) <= 0x7f)
752 xfer_count -= 0x20;
753 }
754
755 desc = txx9dmac_desc_get(dc);
756 if (!desc) {
757 txx9dmac_desc_put(dc, first);
758 return NULL;
759 }
760
761 if (__is_dmac64(ddev)) {
762 desc->hwdesc.SAR = src + offset;
763 desc->hwdesc.DAR = dest + offset;
764 desc->hwdesc.CNTR = xfer_count;
765 txx9dmac_desc_set_nosimple(ddev, desc, 8, 8,
766 dc->ccr | TXX9_DMA_CCR_XFACT);
767 } else {
768 desc->hwdesc32.SAR = src + offset;
769 desc->hwdesc32.DAR = dest + offset;
770 desc->hwdesc32.CNTR = xfer_count;
771 txx9dmac_desc_set_nosimple(ddev, desc, 4, 4,
772 dc->ccr | TXX9_DMA_CCR_XFACT);
773 }
774
775 /*
776 * The descriptors on tx_list are not reachable from
777 * the dc->queue list or dc->active_list after a
778 * submit. If we put all descriptors on active_list,
779 * calling of callback on the completion will be more
780 * complex.
781 */
782 if (!first) {
783 first = desc;
784 } else {
785 desc_write_CHAR(dc, prev, desc->txd.phys);
786 dma_sync_single_for_device(chan2parent(&dc->chan),
787 prev->txd.phys, ddev->descsize,
788 DMA_TO_DEVICE);
789 list_add_tail(&desc->desc_node, &first->tx_list);
790 }
791 prev = desc;
792 }
793
794 /* Trigger interrupt after last block */
795 if (flags & DMA_PREP_INTERRUPT)
796 txx9dmac_desc_set_INTENT(ddev, prev);
797
798 desc_write_CHAR(dc, prev, 0);
799 dma_sync_single_for_device(chan2parent(&dc->chan),
800 prev->txd.phys, ddev->descsize,
801 DMA_TO_DEVICE);
802
803 first->txd.flags = flags;
804 first->len = len;
805
806 return &first->txd;
807}
808
809static struct dma_async_tx_descriptor *
810txx9dmac_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
811 unsigned int sg_len, enum dma_transfer_direction direction,
812 unsigned long flags, void *context)
813{
814 struct txx9dmac_chan *dc = to_txx9dmac_chan(chan);
815 struct txx9dmac_dev *ddev = dc->ddev;
816 struct txx9dmac_slave *ds = chan->private;
817 struct txx9dmac_desc *prev;
818 struct txx9dmac_desc *first;
819 unsigned int i;
820 struct scatterlist *sg;
821
822 dev_vdbg(chan2dev(chan), "prep_dma_slave\n");
823
824 BUG_ON(!ds || !ds->reg_width);
825 if (ds->tx_reg)
826 BUG_ON(direction != DMA_MEM_TO_DEV);
827 else
828 BUG_ON(direction != DMA_DEV_TO_MEM);
829 if (unlikely(!sg_len))
830 return NULL;
831
832 prev = first = NULL;
833
834 for_each_sg(sgl, sg, sg_len, i) {
835 struct txx9dmac_desc *desc;
836 dma_addr_t mem;
837 u32 sai, dai;
838
839 desc = txx9dmac_desc_get(dc);
840 if (!desc) {
841 txx9dmac_desc_put(dc, first);
842 return NULL;
843 }
844
845 mem = sg_dma_address(sg);
846
847 if (__is_dmac64(ddev)) {
848 if (direction == DMA_MEM_TO_DEV) {
849 desc->hwdesc.SAR = mem;
850 desc->hwdesc.DAR = ds->tx_reg;
851 } else {
852 desc->hwdesc.SAR = ds->rx_reg;
853 desc->hwdesc.DAR = mem;
854 }
855 desc->hwdesc.CNTR = sg_dma_len(sg);
856 } else {
857 if (direction == DMA_MEM_TO_DEV) {
858 desc->hwdesc32.SAR = mem;
859 desc->hwdesc32.DAR = ds->tx_reg;
860 } else {
861 desc->hwdesc32.SAR = ds->rx_reg;
862 desc->hwdesc32.DAR = mem;
863 }
864 desc->hwdesc32.CNTR = sg_dma_len(sg);
865 }
866 if (direction == DMA_MEM_TO_DEV) {
867 sai = ds->reg_width;
868 dai = 0;
869 } else {
870 sai = 0;
871 dai = ds->reg_width;
872 }
873 txx9dmac_desc_set_nosimple(ddev, desc, sai, dai,
874 dc->ccr | TXX9_DMA_CCR_XFACT);
875
876 if (!first) {
877 first = desc;
878 } else {
879 desc_write_CHAR(dc, prev, desc->txd.phys);
880 dma_sync_single_for_device(chan2parent(&dc->chan),
881 prev->txd.phys,
882 ddev->descsize,
883 DMA_TO_DEVICE);
884 list_add_tail(&desc->desc_node, &first->tx_list);
885 }
886 prev = desc;
887 }
888
889 /* Trigger interrupt after last block */
890 if (flags & DMA_PREP_INTERRUPT)
891 txx9dmac_desc_set_INTENT(ddev, prev);
892
893 desc_write_CHAR(dc, prev, 0);
894 dma_sync_single_for_device(chan2parent(&dc->chan),
895 prev->txd.phys, ddev->descsize,
896 DMA_TO_DEVICE);
897
898 first->txd.flags = flags;
899 first->len = 0;
900
901 return &first->txd;
902}
903
904static int txx9dmac_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
905 unsigned long arg)
906{
907 struct txx9dmac_chan *dc = to_txx9dmac_chan(chan);
908 struct txx9dmac_desc *desc, *_desc;
909 LIST_HEAD(list);
910
911 /* Only supports DMA_TERMINATE_ALL */
912 if (cmd != DMA_TERMINATE_ALL)
913 return -EINVAL;
914
915 dev_vdbg(chan2dev(chan), "terminate_all\n");
916 spin_lock_bh(&dc->lock);
917
918 txx9dmac_reset_chan(dc);
919
920 /* active_list entries will end up before queued entries */
921 list_splice_init(&dc->queue, &list);
922 list_splice_init(&dc->active_list, &list);
923
924 spin_unlock_bh(&dc->lock);
925
926 /* Flush all pending and queued descriptors */
927 list_for_each_entry_safe(desc, _desc, &list, desc_node)
928 txx9dmac_descriptor_complete(dc, desc);
929
930 return 0;
931}
932
933static enum dma_status
934txx9dmac_tx_status(struct dma_chan *chan, dma_cookie_t cookie,
935 struct dma_tx_state *txstate)
936{
937 struct txx9dmac_chan *dc = to_txx9dmac_chan(chan);
938 enum dma_status ret;
939
940 ret = dma_cookie_status(chan, cookie, txstate);
941 if (ret == DMA_COMPLETE)
942 return DMA_COMPLETE;
943
944 spin_lock_bh(&dc->lock);
945 txx9dmac_scan_descriptors(dc);
946 spin_unlock_bh(&dc->lock);
947
948 return dma_cookie_status(chan, cookie, txstate);
949}
950
951static void txx9dmac_chain_dynamic(struct txx9dmac_chan *dc,
952 struct txx9dmac_desc *prev)
953{
954 struct txx9dmac_dev *ddev = dc->ddev;
955 struct txx9dmac_desc *desc;
956 LIST_HEAD(list);
957
958 prev = txx9dmac_last_child(prev);
959 txx9dmac_dequeue(dc, &list);
960 desc = list_entry(list.next, struct txx9dmac_desc, desc_node);
961 desc_write_CHAR(dc, prev, desc->txd.phys);
962 dma_sync_single_for_device(chan2parent(&dc->chan),
963 prev->txd.phys, ddev->descsize,
964 DMA_TO_DEVICE);
965 mmiowb();
966 if (!(channel_readl(dc, CSR) & TXX9_DMA_CSR_CHNEN) &&
967 channel_read_CHAR(dc) == prev->txd.phys)
968 /* Restart chain DMA */
969 channel_write_CHAR(dc, desc->txd.phys);
970 list_splice_tail(&list, &dc->active_list);
971}
972
973static void txx9dmac_issue_pending(struct dma_chan *chan)
974{
975 struct txx9dmac_chan *dc = to_txx9dmac_chan(chan);
976
977 spin_lock_bh(&dc->lock);
978
979 if (!list_empty(&dc->active_list))
980 txx9dmac_scan_descriptors(dc);
981 if (!list_empty(&dc->queue)) {
982 if (list_empty(&dc->active_list)) {
983 txx9dmac_dequeue(dc, &dc->active_list);
984 txx9dmac_dostart(dc, txx9dmac_first_active(dc));
985 } else if (txx9_dma_have_SMPCHN()) {
986 struct txx9dmac_desc *prev = txx9dmac_last_active(dc);
987
988 if (!(prev->txd.flags & DMA_PREP_INTERRUPT) ||
989 txx9dmac_chan_INTENT(dc))
990 txx9dmac_chain_dynamic(dc, prev);
991 }
992 }
993
994 spin_unlock_bh(&dc->lock);
995}
996
997static int txx9dmac_alloc_chan_resources(struct dma_chan *chan)
998{
999 struct txx9dmac_chan *dc = to_txx9dmac_chan(chan);
1000 struct txx9dmac_slave *ds = chan->private;
1001 struct txx9dmac_desc *desc;
1002 int i;
1003
1004 dev_vdbg(chan2dev(chan), "alloc_chan_resources\n");
1005
1006 /* ASSERT: channel is idle */
1007 if (channel_readl(dc, CSR) & TXX9_DMA_CSR_XFACT) {
1008 dev_dbg(chan2dev(chan), "DMA channel not idle?\n");
1009 return -EIO;
1010 }
1011
1012 dma_cookie_init(chan);
1013
1014 dc->ccr = TXX9_DMA_CCR_IMMCHN | TXX9_DMA_CCR_INTENE | CCR_LE;
1015 txx9dmac_chan_set_SMPCHN(dc);
1016 if (!txx9_dma_have_SMPCHN() || (dc->ccr & TXX9_DMA_CCR_SMPCHN))
1017 dc->ccr |= TXX9_DMA_CCR_INTENC;
1018 if (chan->device->device_prep_dma_memcpy) {
1019 if (ds)
1020 return -EINVAL;
1021 dc->ccr |= TXX9_DMA_CCR_XFSZ_X8;
1022 } else {
1023 if (!ds ||
1024 (ds->tx_reg && ds->rx_reg) || (!ds->tx_reg && !ds->rx_reg))
1025 return -EINVAL;
1026 dc->ccr |= TXX9_DMA_CCR_EXTRQ |
1027 TXX9_DMA_CCR_XFSZ(__ffs(ds->reg_width));
1028 txx9dmac_chan_set_INTENT(dc);
1029 }
1030
1031 spin_lock_bh(&dc->lock);
1032 i = dc->descs_allocated;
1033 while (dc->descs_allocated < TXX9_DMA_INITIAL_DESC_COUNT) {
1034 spin_unlock_bh(&dc->lock);
1035
1036 desc = txx9dmac_desc_alloc(dc, GFP_KERNEL);
1037 if (!desc) {
1038 dev_info(chan2dev(chan),
1039 "only allocated %d descriptors\n", i);
1040 spin_lock_bh(&dc->lock);
1041 break;
1042 }
1043 txx9dmac_desc_put(dc, desc);
1044
1045 spin_lock_bh(&dc->lock);
1046 i = ++dc->descs_allocated;
1047 }
1048 spin_unlock_bh(&dc->lock);
1049
1050 dev_dbg(chan2dev(chan),
1051 "alloc_chan_resources allocated %d descriptors\n", i);
1052
1053 return i;
1054}
1055
1056static void txx9dmac_free_chan_resources(struct dma_chan *chan)
1057{
1058 struct txx9dmac_chan *dc = to_txx9dmac_chan(chan);
1059 struct txx9dmac_dev *ddev = dc->ddev;
1060 struct txx9dmac_desc *desc, *_desc;
1061 LIST_HEAD(list);
1062
1063 dev_dbg(chan2dev(chan), "free_chan_resources (descs allocated=%u)\n",
1064 dc->descs_allocated);
1065
1066 /* ASSERT: channel is idle */
1067 BUG_ON(!list_empty(&dc->active_list));
1068 BUG_ON(!list_empty(&dc->queue));
1069 BUG_ON(channel_readl(dc, CSR) & TXX9_DMA_CSR_XFACT);
1070
1071 spin_lock_bh(&dc->lock);
1072 list_splice_init(&dc->free_list, &list);
1073 dc->descs_allocated = 0;
1074 spin_unlock_bh(&dc->lock);
1075
1076 list_for_each_entry_safe(desc, _desc, &list, desc_node) {
1077 dev_vdbg(chan2dev(chan), " freeing descriptor %p\n", desc);
1078 dma_unmap_single(chan2parent(chan), desc->txd.phys,
1079 ddev->descsize, DMA_TO_DEVICE);
1080 kfree(desc);
1081 }
1082
1083 dev_vdbg(chan2dev(chan), "free_chan_resources done\n");
1084}
1085
1086/*----------------------------------------------------------------------*/
1087
1088static void txx9dmac_off(struct txx9dmac_dev *ddev)
1089{
1090 dma_writel(ddev, MCR, 0);
1091 mmiowb();
1092}
1093
1094static int __init txx9dmac_chan_probe(struct platform_device *pdev)
1095{
1096 struct txx9dmac_chan_platform_data *cpdata =
1097 dev_get_platdata(&pdev->dev);
1098 struct platform_device *dmac_dev = cpdata->dmac_dev;
1099 struct txx9dmac_platform_data *pdata = dev_get_platdata(&dmac_dev->dev);
1100 struct txx9dmac_chan *dc;
1101 int err;
1102 int ch = pdev->id % TXX9_DMA_MAX_NR_CHANNELS;
1103 int irq;
1104
1105 dc = devm_kzalloc(&pdev->dev, sizeof(*dc), GFP_KERNEL);
1106 if (!dc)
1107 return -ENOMEM;
1108
1109 dc->dma.dev = &pdev->dev;
1110 dc->dma.device_alloc_chan_resources = txx9dmac_alloc_chan_resources;
1111 dc->dma.device_free_chan_resources = txx9dmac_free_chan_resources;
1112 dc->dma.device_control = txx9dmac_control;
1113 dc->dma.device_tx_status = txx9dmac_tx_status;
1114 dc->dma.device_issue_pending = txx9dmac_issue_pending;
1115 if (pdata && pdata->memcpy_chan == ch) {
1116 dc->dma.device_prep_dma_memcpy = txx9dmac_prep_dma_memcpy;
1117 dma_cap_set(DMA_MEMCPY, dc->dma.cap_mask);
1118 } else {
1119 dc->dma.device_prep_slave_sg = txx9dmac_prep_slave_sg;
1120 dma_cap_set(DMA_SLAVE, dc->dma.cap_mask);
1121 dma_cap_set(DMA_PRIVATE, dc->dma.cap_mask);
1122 }
1123
1124 INIT_LIST_HEAD(&dc->dma.channels);
1125 dc->ddev = platform_get_drvdata(dmac_dev);
1126 if (dc->ddev->irq < 0) {
1127 irq = platform_get_irq(pdev, 0);
1128 if (irq < 0)
1129 return irq;
1130 tasklet_init(&dc->tasklet, txx9dmac_chan_tasklet,
1131 (unsigned long)dc);
1132 dc->irq = irq;
1133 err = devm_request_irq(&pdev->dev, dc->irq,
1134 txx9dmac_chan_interrupt, 0, dev_name(&pdev->dev), dc);
1135 if (err)
1136 return err;
1137 } else
1138 dc->irq = -1;
1139 dc->ddev->chan[ch] = dc;
1140 dc->chan.device = &dc->dma;
1141 list_add_tail(&dc->chan.device_node, &dc->chan.device->channels);
1142 dma_cookie_init(&dc->chan);
1143
1144 if (is_dmac64(dc))
1145 dc->ch_regs = &__txx9dmac_regs(dc->ddev)->CHAN[ch];
1146 else
1147 dc->ch_regs = &__txx9dmac_regs32(dc->ddev)->CHAN[ch];
1148 spin_lock_init(&dc->lock);
1149
1150 INIT_LIST_HEAD(&dc->active_list);
1151 INIT_LIST_HEAD(&dc->queue);
1152 INIT_LIST_HEAD(&dc->free_list);
1153
1154 txx9dmac_reset_chan(dc);
1155
1156 platform_set_drvdata(pdev, dc);
1157
1158 err = dma_async_device_register(&dc->dma);
1159 if (err)
1160 return err;
1161 dev_dbg(&pdev->dev, "TXx9 DMA Channel (dma%d%s%s)\n",
1162 dc->dma.dev_id,
1163 dma_has_cap(DMA_MEMCPY, dc->dma.cap_mask) ? " memcpy" : "",
1164 dma_has_cap(DMA_SLAVE, dc->dma.cap_mask) ? " slave" : "");
1165
1166 return 0;
1167}
1168
1169static int txx9dmac_chan_remove(struct platform_device *pdev)
1170{
1171 struct txx9dmac_chan *dc = platform_get_drvdata(pdev);
1172
1173 dma_async_device_unregister(&dc->dma);
1174 if (dc->irq >= 0)
1175 tasklet_kill(&dc->tasklet);
1176 dc->ddev->chan[pdev->id % TXX9_DMA_MAX_NR_CHANNELS] = NULL;
1177 return 0;
1178}
1179
1180static int __init txx9dmac_probe(struct platform_device *pdev)
1181{
1182 struct txx9dmac_platform_data *pdata = dev_get_platdata(&pdev->dev);
1183 struct resource *io;
1184 struct txx9dmac_dev *ddev;
1185 u32 mcr;
1186 int err;
1187
1188 io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1189 if (!io)
1190 return -EINVAL;
1191
1192 ddev = devm_kzalloc(&pdev->dev, sizeof(*ddev), GFP_KERNEL);
1193 if (!ddev)
1194 return -ENOMEM;
1195
1196 if (!devm_request_mem_region(&pdev->dev, io->start, resource_size(io),
1197 dev_name(&pdev->dev)))
1198 return -EBUSY;
1199
1200 ddev->regs = devm_ioremap(&pdev->dev, io->start, resource_size(io));
1201 if (!ddev->regs)
1202 return -ENOMEM;
1203 ddev->have_64bit_regs = pdata->have_64bit_regs;
1204 if (__is_dmac64(ddev))
1205 ddev->descsize = sizeof(struct txx9dmac_hwdesc);
1206 else
1207 ddev->descsize = sizeof(struct txx9dmac_hwdesc32);
1208
1209 /* force dma off, just in case */
1210 txx9dmac_off(ddev);
1211
1212 ddev->irq = platform_get_irq(pdev, 0);
1213 if (ddev->irq >= 0) {
1214 tasklet_init(&ddev->tasklet, txx9dmac_tasklet,
1215 (unsigned long)ddev);
1216 err = devm_request_irq(&pdev->dev, ddev->irq,
1217 txx9dmac_interrupt, 0, dev_name(&pdev->dev), ddev);
1218 if (err)
1219 return err;
1220 }
1221
1222 mcr = TXX9_DMA_MCR_MSTEN | MCR_LE;
1223 if (pdata && pdata->memcpy_chan >= 0)
1224 mcr |= TXX9_DMA_MCR_FIFUM(pdata->memcpy_chan);
1225 dma_writel(ddev, MCR, mcr);
1226
1227 platform_set_drvdata(pdev, ddev);
1228 return 0;
1229}
1230
1231static int txx9dmac_remove(struct platform_device *pdev)
1232{
1233 struct txx9dmac_dev *ddev = platform_get_drvdata(pdev);
1234
1235 txx9dmac_off(ddev);
1236 if (ddev->irq >= 0)
1237 tasklet_kill(&ddev->tasklet);
1238 return 0;
1239}
1240
1241static void txx9dmac_shutdown(struct platform_device *pdev)
1242{
1243 struct txx9dmac_dev *ddev = platform_get_drvdata(pdev);
1244
1245 txx9dmac_off(ddev);
1246}
1247
1248static int txx9dmac_suspend_noirq(struct device *dev)
1249{
1250 struct platform_device *pdev = to_platform_device(dev);
1251 struct txx9dmac_dev *ddev = platform_get_drvdata(pdev);
1252
1253 txx9dmac_off(ddev);
1254 return 0;
1255}
1256
1257static int txx9dmac_resume_noirq(struct device *dev)
1258{
1259 struct platform_device *pdev = to_platform_device(dev);
1260 struct txx9dmac_dev *ddev = platform_get_drvdata(pdev);
1261 struct txx9dmac_platform_data *pdata = dev_get_platdata(&pdev->dev);
1262 u32 mcr;
1263
1264 mcr = TXX9_DMA_MCR_MSTEN | MCR_LE;
1265 if (pdata && pdata->memcpy_chan >= 0)
1266 mcr |= TXX9_DMA_MCR_FIFUM(pdata->memcpy_chan);
1267 dma_writel(ddev, MCR, mcr);
1268 return 0;
1269
1270}
1271
1272static const struct dev_pm_ops txx9dmac_dev_pm_ops = {
1273 .suspend_noirq = txx9dmac_suspend_noirq,
1274 .resume_noirq = txx9dmac_resume_noirq,
1275};
1276
1277static struct platform_driver txx9dmac_chan_driver = {
1278 .remove = txx9dmac_chan_remove,
1279 .driver = {
1280 .name = "txx9dmac-chan",
1281 },
1282};
1283
1284static struct platform_driver txx9dmac_driver = {
1285 .remove = txx9dmac_remove,
1286 .shutdown = txx9dmac_shutdown,
1287 .driver = {
1288 .name = "txx9dmac",
1289 .pm = &txx9dmac_dev_pm_ops,
1290 },
1291};
1292
1293static int __init txx9dmac_init(void)
1294{
1295 int rc;
1296
1297 rc = platform_driver_probe(&txx9dmac_driver, txx9dmac_probe);
1298 if (!rc) {
1299 rc = platform_driver_probe(&txx9dmac_chan_driver,
1300 txx9dmac_chan_probe);
1301 if (rc)
1302 platform_driver_unregister(&txx9dmac_driver);
1303 }
1304 return rc;
1305}
1306module_init(txx9dmac_init);
1307
1308static void __exit txx9dmac_exit(void)
1309{
1310 platform_driver_unregister(&txx9dmac_chan_driver);
1311 platform_driver_unregister(&txx9dmac_driver);
1312}
1313module_exit(txx9dmac_exit);
1314
1315MODULE_LICENSE("GPL");
1316MODULE_DESCRIPTION("TXx9 DMA Controller driver");
1317MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>");
1318MODULE_ALIAS("platform:txx9dmac");
1319MODULE_ALIAS("platform:txx9dmac-chan");
1/*
2 * Driver for the TXx9 SoC DMA Controller
3 *
4 * Copyright (C) 2009 Atsushi Nemoto
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10#include <linux/dma-mapping.h>
11#include <linux/init.h>
12#include <linux/interrupt.h>
13#include <linux/io.h>
14#include <linux/module.h>
15#include <linux/platform_device.h>
16#include <linux/slab.h>
17#include <linux/scatterlist.h>
18
19#include "dmaengine.h"
20#include "txx9dmac.h"
21
22static struct txx9dmac_chan *to_txx9dmac_chan(struct dma_chan *chan)
23{
24 return container_of(chan, struct txx9dmac_chan, chan);
25}
26
27static struct txx9dmac_cregs __iomem *__dma_regs(const struct txx9dmac_chan *dc)
28{
29 return dc->ch_regs;
30}
31
32static struct txx9dmac_cregs32 __iomem *__dma_regs32(
33 const struct txx9dmac_chan *dc)
34{
35 return dc->ch_regs;
36}
37
38#define channel64_readq(dc, name) \
39 __raw_readq(&(__dma_regs(dc)->name))
40#define channel64_writeq(dc, name, val) \
41 __raw_writeq((val), &(__dma_regs(dc)->name))
42#define channel64_readl(dc, name) \
43 __raw_readl(&(__dma_regs(dc)->name))
44#define channel64_writel(dc, name, val) \
45 __raw_writel((val), &(__dma_regs(dc)->name))
46
47#define channel32_readl(dc, name) \
48 __raw_readl(&(__dma_regs32(dc)->name))
49#define channel32_writel(dc, name, val) \
50 __raw_writel((val), &(__dma_regs32(dc)->name))
51
52#define channel_readq(dc, name) channel64_readq(dc, name)
53#define channel_writeq(dc, name, val) channel64_writeq(dc, name, val)
54#define channel_readl(dc, name) \
55 (is_dmac64(dc) ? \
56 channel64_readl(dc, name) : channel32_readl(dc, name))
57#define channel_writel(dc, name, val) \
58 (is_dmac64(dc) ? \
59 channel64_writel(dc, name, val) : channel32_writel(dc, name, val))
60
61static dma_addr_t channel64_read_CHAR(const struct txx9dmac_chan *dc)
62{
63 if (sizeof(__dma_regs(dc)->CHAR) == sizeof(u64))
64 return channel64_readq(dc, CHAR);
65 else
66 return channel64_readl(dc, CHAR);
67}
68
69static void channel64_write_CHAR(const struct txx9dmac_chan *dc, dma_addr_t val)
70{
71 if (sizeof(__dma_regs(dc)->CHAR) == sizeof(u64))
72 channel64_writeq(dc, CHAR, val);
73 else
74 channel64_writel(dc, CHAR, val);
75}
76
77static void channel64_clear_CHAR(const struct txx9dmac_chan *dc)
78{
79#if defined(CONFIG_32BIT) && !defined(CONFIG_PHYS_ADDR_T_64BIT)
80 channel64_writel(dc, CHAR, 0);
81 channel64_writel(dc, __pad_CHAR, 0);
82#else
83 channel64_writeq(dc, CHAR, 0);
84#endif
85}
86
87static dma_addr_t channel_read_CHAR(const struct txx9dmac_chan *dc)
88{
89 if (is_dmac64(dc))
90 return channel64_read_CHAR(dc);
91 else
92 return channel32_readl(dc, CHAR);
93}
94
95static void channel_write_CHAR(const struct txx9dmac_chan *dc, dma_addr_t val)
96{
97 if (is_dmac64(dc))
98 channel64_write_CHAR(dc, val);
99 else
100 channel32_writel(dc, CHAR, val);
101}
102
103static struct txx9dmac_regs __iomem *__txx9dmac_regs(
104 const struct txx9dmac_dev *ddev)
105{
106 return ddev->regs;
107}
108
109static struct txx9dmac_regs32 __iomem *__txx9dmac_regs32(
110 const struct txx9dmac_dev *ddev)
111{
112 return ddev->regs;
113}
114
115#define dma64_readl(ddev, name) \
116 __raw_readl(&(__txx9dmac_regs(ddev)->name))
117#define dma64_writel(ddev, name, val) \
118 __raw_writel((val), &(__txx9dmac_regs(ddev)->name))
119
120#define dma32_readl(ddev, name) \
121 __raw_readl(&(__txx9dmac_regs32(ddev)->name))
122#define dma32_writel(ddev, name, val) \
123 __raw_writel((val), &(__txx9dmac_regs32(ddev)->name))
124
125#define dma_readl(ddev, name) \
126 (__is_dmac64(ddev) ? \
127 dma64_readl(ddev, name) : dma32_readl(ddev, name))
128#define dma_writel(ddev, name, val) \
129 (__is_dmac64(ddev) ? \
130 dma64_writel(ddev, name, val) : dma32_writel(ddev, name, val))
131
132static struct device *chan2dev(struct dma_chan *chan)
133{
134 return &chan->dev->device;
135}
136static struct device *chan2parent(struct dma_chan *chan)
137{
138 return chan->dev->device.parent;
139}
140
141static struct txx9dmac_desc *
142txd_to_txx9dmac_desc(struct dma_async_tx_descriptor *txd)
143{
144 return container_of(txd, struct txx9dmac_desc, txd);
145}
146
147static dma_addr_t desc_read_CHAR(const struct txx9dmac_chan *dc,
148 const struct txx9dmac_desc *desc)
149{
150 return is_dmac64(dc) ? desc->hwdesc.CHAR : desc->hwdesc32.CHAR;
151}
152
153static void desc_write_CHAR(const struct txx9dmac_chan *dc,
154 struct txx9dmac_desc *desc, dma_addr_t val)
155{
156 if (is_dmac64(dc))
157 desc->hwdesc.CHAR = val;
158 else
159 desc->hwdesc32.CHAR = val;
160}
161
162#define TXX9_DMA_MAX_COUNT 0x04000000
163
164#define TXX9_DMA_INITIAL_DESC_COUNT 64
165
166static struct txx9dmac_desc *txx9dmac_first_active(struct txx9dmac_chan *dc)
167{
168 return list_entry(dc->active_list.next,
169 struct txx9dmac_desc, desc_node);
170}
171
172static struct txx9dmac_desc *txx9dmac_last_active(struct txx9dmac_chan *dc)
173{
174 return list_entry(dc->active_list.prev,
175 struct txx9dmac_desc, desc_node);
176}
177
178static struct txx9dmac_desc *txx9dmac_first_queued(struct txx9dmac_chan *dc)
179{
180 return list_entry(dc->queue.next, struct txx9dmac_desc, desc_node);
181}
182
183static struct txx9dmac_desc *txx9dmac_last_child(struct txx9dmac_desc *desc)
184{
185 if (!list_empty(&desc->tx_list))
186 desc = list_entry(desc->tx_list.prev, typeof(*desc), desc_node);
187 return desc;
188}
189
190static dma_cookie_t txx9dmac_tx_submit(struct dma_async_tx_descriptor *tx);
191
192static struct txx9dmac_desc *txx9dmac_desc_alloc(struct txx9dmac_chan *dc,
193 gfp_t flags)
194{
195 struct txx9dmac_dev *ddev = dc->ddev;
196 struct txx9dmac_desc *desc;
197
198 desc = kzalloc(sizeof(*desc), flags);
199 if (!desc)
200 return NULL;
201 INIT_LIST_HEAD(&desc->tx_list);
202 dma_async_tx_descriptor_init(&desc->txd, &dc->chan);
203 desc->txd.tx_submit = txx9dmac_tx_submit;
204 /* txd.flags will be overwritten in prep funcs */
205 desc->txd.flags = DMA_CTRL_ACK;
206 desc->txd.phys = dma_map_single(chan2parent(&dc->chan), &desc->hwdesc,
207 ddev->descsize, DMA_TO_DEVICE);
208 return desc;
209}
210
211static struct txx9dmac_desc *txx9dmac_desc_get(struct txx9dmac_chan *dc)
212{
213 struct txx9dmac_desc *desc, *_desc;
214 struct txx9dmac_desc *ret = NULL;
215 unsigned int i = 0;
216
217 spin_lock_bh(&dc->lock);
218 list_for_each_entry_safe(desc, _desc, &dc->free_list, desc_node) {
219 if (async_tx_test_ack(&desc->txd)) {
220 list_del(&desc->desc_node);
221 ret = desc;
222 break;
223 }
224 dev_dbg(chan2dev(&dc->chan), "desc %p not ACKed\n", desc);
225 i++;
226 }
227 spin_unlock_bh(&dc->lock);
228
229 dev_vdbg(chan2dev(&dc->chan), "scanned %u descriptors on freelist\n",
230 i);
231 if (!ret) {
232 ret = txx9dmac_desc_alloc(dc, GFP_ATOMIC);
233 if (ret) {
234 spin_lock_bh(&dc->lock);
235 dc->descs_allocated++;
236 spin_unlock_bh(&dc->lock);
237 } else
238 dev_err(chan2dev(&dc->chan),
239 "not enough descriptors available\n");
240 }
241 return ret;
242}
243
244static void txx9dmac_sync_desc_for_cpu(struct txx9dmac_chan *dc,
245 struct txx9dmac_desc *desc)
246{
247 struct txx9dmac_dev *ddev = dc->ddev;
248 struct txx9dmac_desc *child;
249
250 list_for_each_entry(child, &desc->tx_list, desc_node)
251 dma_sync_single_for_cpu(chan2parent(&dc->chan),
252 child->txd.phys, ddev->descsize,
253 DMA_TO_DEVICE);
254 dma_sync_single_for_cpu(chan2parent(&dc->chan),
255 desc->txd.phys, ddev->descsize,
256 DMA_TO_DEVICE);
257}
258
259/*
260 * Move a descriptor, including any children, to the free list.
261 * `desc' must not be on any lists.
262 */
263static void txx9dmac_desc_put(struct txx9dmac_chan *dc,
264 struct txx9dmac_desc *desc)
265{
266 if (desc) {
267 struct txx9dmac_desc *child;
268
269 txx9dmac_sync_desc_for_cpu(dc, desc);
270
271 spin_lock_bh(&dc->lock);
272 list_for_each_entry(child, &desc->tx_list, desc_node)
273 dev_vdbg(chan2dev(&dc->chan),
274 "moving child desc %p to freelist\n",
275 child);
276 list_splice_init(&desc->tx_list, &dc->free_list);
277 dev_vdbg(chan2dev(&dc->chan), "moving desc %p to freelist\n",
278 desc);
279 list_add(&desc->desc_node, &dc->free_list);
280 spin_unlock_bh(&dc->lock);
281 }
282}
283
284/*----------------------------------------------------------------------*/
285
286static void txx9dmac_dump_regs(struct txx9dmac_chan *dc)
287{
288 if (is_dmac64(dc))
289 dev_err(chan2dev(&dc->chan),
290 " CHAR: %#llx SAR: %#llx DAR: %#llx CNTR: %#x"
291 " SAIR: %#x DAIR: %#x CCR: %#x CSR: %#x\n",
292 (u64)channel64_read_CHAR(dc),
293 channel64_readq(dc, SAR),
294 channel64_readq(dc, DAR),
295 channel64_readl(dc, CNTR),
296 channel64_readl(dc, SAIR),
297 channel64_readl(dc, DAIR),
298 channel64_readl(dc, CCR),
299 channel64_readl(dc, CSR));
300 else
301 dev_err(chan2dev(&dc->chan),
302 " CHAR: %#x SAR: %#x DAR: %#x CNTR: %#x"
303 " SAIR: %#x DAIR: %#x CCR: %#x CSR: %#x\n",
304 channel32_readl(dc, CHAR),
305 channel32_readl(dc, SAR),
306 channel32_readl(dc, DAR),
307 channel32_readl(dc, CNTR),
308 channel32_readl(dc, SAIR),
309 channel32_readl(dc, DAIR),
310 channel32_readl(dc, CCR),
311 channel32_readl(dc, CSR));
312}
313
314static void txx9dmac_reset_chan(struct txx9dmac_chan *dc)
315{
316 channel_writel(dc, CCR, TXX9_DMA_CCR_CHRST);
317 if (is_dmac64(dc)) {
318 channel64_clear_CHAR(dc);
319 channel_writeq(dc, SAR, 0);
320 channel_writeq(dc, DAR, 0);
321 } else {
322 channel_writel(dc, CHAR, 0);
323 channel_writel(dc, SAR, 0);
324 channel_writel(dc, DAR, 0);
325 }
326 channel_writel(dc, CNTR, 0);
327 channel_writel(dc, SAIR, 0);
328 channel_writel(dc, DAIR, 0);
329 channel_writel(dc, CCR, 0);
330 mmiowb();
331}
332
333/* Called with dc->lock held and bh disabled */
334static void txx9dmac_dostart(struct txx9dmac_chan *dc,
335 struct txx9dmac_desc *first)
336{
337 struct txx9dmac_slave *ds = dc->chan.private;
338 u32 sai, dai;
339
340 dev_vdbg(chan2dev(&dc->chan), "dostart %u %p\n",
341 first->txd.cookie, first);
342 /* ASSERT: channel is idle */
343 if (channel_readl(dc, CSR) & TXX9_DMA_CSR_XFACT) {
344 dev_err(chan2dev(&dc->chan),
345 "BUG: Attempted to start non-idle channel\n");
346 txx9dmac_dump_regs(dc);
347 /* The tasklet will hopefully advance the queue... */
348 return;
349 }
350
351 if (is_dmac64(dc)) {
352 channel64_writel(dc, CNTR, 0);
353 channel64_writel(dc, CSR, 0xffffffff);
354 if (ds) {
355 if (ds->tx_reg) {
356 sai = ds->reg_width;
357 dai = 0;
358 } else {
359 sai = 0;
360 dai = ds->reg_width;
361 }
362 } else {
363 sai = 8;
364 dai = 8;
365 }
366 channel64_writel(dc, SAIR, sai);
367 channel64_writel(dc, DAIR, dai);
368 /* All 64-bit DMAC supports SMPCHN */
369 channel64_writel(dc, CCR, dc->ccr);
370 /* Writing a non zero value to CHAR will assert XFACT */
371 channel64_write_CHAR(dc, first->txd.phys);
372 } else {
373 channel32_writel(dc, CNTR, 0);
374 channel32_writel(dc, CSR, 0xffffffff);
375 if (ds) {
376 if (ds->tx_reg) {
377 sai = ds->reg_width;
378 dai = 0;
379 } else {
380 sai = 0;
381 dai = ds->reg_width;
382 }
383 } else {
384 sai = 4;
385 dai = 4;
386 }
387 channel32_writel(dc, SAIR, sai);
388 channel32_writel(dc, DAIR, dai);
389 if (txx9_dma_have_SMPCHN()) {
390 channel32_writel(dc, CCR, dc->ccr);
391 /* Writing a non zero value to CHAR will assert XFACT */
392 channel32_writel(dc, CHAR, first->txd.phys);
393 } else {
394 channel32_writel(dc, CHAR, first->txd.phys);
395 channel32_writel(dc, CCR, dc->ccr);
396 }
397 }
398}
399
400/*----------------------------------------------------------------------*/
401
402static void
403txx9dmac_descriptor_complete(struct txx9dmac_chan *dc,
404 struct txx9dmac_desc *desc)
405{
406 struct dmaengine_desc_callback cb;
407 struct dma_async_tx_descriptor *txd = &desc->txd;
408
409 dev_vdbg(chan2dev(&dc->chan), "descriptor %u %p complete\n",
410 txd->cookie, desc);
411
412 dma_cookie_complete(txd);
413 dmaengine_desc_get_callback(txd, &cb);
414
415 txx9dmac_sync_desc_for_cpu(dc, desc);
416 list_splice_init(&desc->tx_list, &dc->free_list);
417 list_move(&desc->desc_node, &dc->free_list);
418
419 dma_descriptor_unmap(txd);
420 /*
421 * The API requires that no submissions are done from a
422 * callback, so we don't need to drop the lock here
423 */
424 dmaengine_desc_callback_invoke(&cb, NULL);
425 dma_run_dependencies(txd);
426}
427
428static void txx9dmac_dequeue(struct txx9dmac_chan *dc, struct list_head *list)
429{
430 struct txx9dmac_dev *ddev = dc->ddev;
431 struct txx9dmac_desc *desc;
432 struct txx9dmac_desc *prev = NULL;
433
434 BUG_ON(!list_empty(list));
435 do {
436 desc = txx9dmac_first_queued(dc);
437 if (prev) {
438 desc_write_CHAR(dc, prev, desc->txd.phys);
439 dma_sync_single_for_device(chan2parent(&dc->chan),
440 prev->txd.phys, ddev->descsize,
441 DMA_TO_DEVICE);
442 }
443 prev = txx9dmac_last_child(desc);
444 list_move_tail(&desc->desc_node, list);
445 /* Make chain-completion interrupt happen */
446 if ((desc->txd.flags & DMA_PREP_INTERRUPT) &&
447 !txx9dmac_chan_INTENT(dc))
448 break;
449 } while (!list_empty(&dc->queue));
450}
451
452static void txx9dmac_complete_all(struct txx9dmac_chan *dc)
453{
454 struct txx9dmac_desc *desc, *_desc;
455 LIST_HEAD(list);
456
457 /*
458 * Submit queued descriptors ASAP, i.e. before we go through
459 * the completed ones.
460 */
461 list_splice_init(&dc->active_list, &list);
462 if (!list_empty(&dc->queue)) {
463 txx9dmac_dequeue(dc, &dc->active_list);
464 txx9dmac_dostart(dc, txx9dmac_first_active(dc));
465 }
466
467 list_for_each_entry_safe(desc, _desc, &list, desc_node)
468 txx9dmac_descriptor_complete(dc, desc);
469}
470
471static void txx9dmac_dump_desc(struct txx9dmac_chan *dc,
472 struct txx9dmac_hwdesc *desc)
473{
474 if (is_dmac64(dc)) {
475#ifdef TXX9_DMA_USE_SIMPLE_CHAIN
476 dev_crit(chan2dev(&dc->chan),
477 " desc: ch%#llx s%#llx d%#llx c%#x\n",
478 (u64)desc->CHAR, desc->SAR, desc->DAR, desc->CNTR);
479#else
480 dev_crit(chan2dev(&dc->chan),
481 " desc: ch%#llx s%#llx d%#llx c%#x"
482 " si%#x di%#x cc%#x cs%#x\n",
483 (u64)desc->CHAR, desc->SAR, desc->DAR, desc->CNTR,
484 desc->SAIR, desc->DAIR, desc->CCR, desc->CSR);
485#endif
486 } else {
487 struct txx9dmac_hwdesc32 *d = (struct txx9dmac_hwdesc32 *)desc;
488#ifdef TXX9_DMA_USE_SIMPLE_CHAIN
489 dev_crit(chan2dev(&dc->chan),
490 " desc: ch%#x s%#x d%#x c%#x\n",
491 d->CHAR, d->SAR, d->DAR, d->CNTR);
492#else
493 dev_crit(chan2dev(&dc->chan),
494 " desc: ch%#x s%#x d%#x c%#x"
495 " si%#x di%#x cc%#x cs%#x\n",
496 d->CHAR, d->SAR, d->DAR, d->CNTR,
497 d->SAIR, d->DAIR, d->CCR, d->CSR);
498#endif
499 }
500}
501
502static void txx9dmac_handle_error(struct txx9dmac_chan *dc, u32 csr)
503{
504 struct txx9dmac_desc *bad_desc;
505 struct txx9dmac_desc *child;
506 u32 errors;
507
508 /*
509 * The descriptor currently at the head of the active list is
510 * borked. Since we don't have any way to report errors, we'll
511 * just have to scream loudly and try to carry on.
512 */
513 dev_crit(chan2dev(&dc->chan), "Abnormal Chain Completion\n");
514 txx9dmac_dump_regs(dc);
515
516 bad_desc = txx9dmac_first_active(dc);
517 list_del_init(&bad_desc->desc_node);
518
519 /* Clear all error flags and try to restart the controller */
520 errors = csr & (TXX9_DMA_CSR_ABCHC |
521 TXX9_DMA_CSR_CFERR | TXX9_DMA_CSR_CHERR |
522 TXX9_DMA_CSR_DESERR | TXX9_DMA_CSR_SORERR);
523 channel_writel(dc, CSR, errors);
524
525 if (list_empty(&dc->active_list) && !list_empty(&dc->queue))
526 txx9dmac_dequeue(dc, &dc->active_list);
527 if (!list_empty(&dc->active_list))
528 txx9dmac_dostart(dc, txx9dmac_first_active(dc));
529
530 dev_crit(chan2dev(&dc->chan),
531 "Bad descriptor submitted for DMA! (cookie: %d)\n",
532 bad_desc->txd.cookie);
533 txx9dmac_dump_desc(dc, &bad_desc->hwdesc);
534 list_for_each_entry(child, &bad_desc->tx_list, desc_node)
535 txx9dmac_dump_desc(dc, &child->hwdesc);
536 /* Pretend the descriptor completed successfully */
537 txx9dmac_descriptor_complete(dc, bad_desc);
538}
539
540static void txx9dmac_scan_descriptors(struct txx9dmac_chan *dc)
541{
542 dma_addr_t chain;
543 struct txx9dmac_desc *desc, *_desc;
544 struct txx9dmac_desc *child;
545 u32 csr;
546
547 if (is_dmac64(dc)) {
548 chain = channel64_read_CHAR(dc);
549 csr = channel64_readl(dc, CSR);
550 channel64_writel(dc, CSR, csr);
551 } else {
552 chain = channel32_readl(dc, CHAR);
553 csr = channel32_readl(dc, CSR);
554 channel32_writel(dc, CSR, csr);
555 }
556 /* For dynamic chain, we should look at XFACT instead of NCHNC */
557 if (!(csr & (TXX9_DMA_CSR_XFACT | TXX9_DMA_CSR_ABCHC))) {
558 /* Everything we've submitted is done */
559 txx9dmac_complete_all(dc);
560 return;
561 }
562 if (!(csr & TXX9_DMA_CSR_CHNEN))
563 chain = 0; /* last descriptor of this chain */
564
565 dev_vdbg(chan2dev(&dc->chan), "scan_descriptors: char=%#llx\n",
566 (u64)chain);
567
568 list_for_each_entry_safe(desc, _desc, &dc->active_list, desc_node) {
569 if (desc_read_CHAR(dc, desc) == chain) {
570 /* This one is currently in progress */
571 if (csr & TXX9_DMA_CSR_ABCHC)
572 goto scan_done;
573 return;
574 }
575
576 list_for_each_entry(child, &desc->tx_list, desc_node)
577 if (desc_read_CHAR(dc, child) == chain) {
578 /* Currently in progress */
579 if (csr & TXX9_DMA_CSR_ABCHC)
580 goto scan_done;
581 return;
582 }
583
584 /*
585 * No descriptors so far seem to be in progress, i.e.
586 * this one must be done.
587 */
588 txx9dmac_descriptor_complete(dc, desc);
589 }
590scan_done:
591 if (csr & TXX9_DMA_CSR_ABCHC) {
592 txx9dmac_handle_error(dc, csr);
593 return;
594 }
595
596 dev_err(chan2dev(&dc->chan),
597 "BUG: All descriptors done, but channel not idle!\n");
598
599 /* Try to continue after resetting the channel... */
600 txx9dmac_reset_chan(dc);
601
602 if (!list_empty(&dc->queue)) {
603 txx9dmac_dequeue(dc, &dc->active_list);
604 txx9dmac_dostart(dc, txx9dmac_first_active(dc));
605 }
606}
607
608static void txx9dmac_chan_tasklet(unsigned long data)
609{
610 int irq;
611 u32 csr;
612 struct txx9dmac_chan *dc;
613
614 dc = (struct txx9dmac_chan *)data;
615 csr = channel_readl(dc, CSR);
616 dev_vdbg(chan2dev(&dc->chan), "tasklet: status=%x\n", csr);
617
618 spin_lock(&dc->lock);
619 if (csr & (TXX9_DMA_CSR_ABCHC | TXX9_DMA_CSR_NCHNC |
620 TXX9_DMA_CSR_NTRNFC))
621 txx9dmac_scan_descriptors(dc);
622 spin_unlock(&dc->lock);
623 irq = dc->irq;
624
625 enable_irq(irq);
626}
627
628static irqreturn_t txx9dmac_chan_interrupt(int irq, void *dev_id)
629{
630 struct txx9dmac_chan *dc = dev_id;
631
632 dev_vdbg(chan2dev(&dc->chan), "interrupt: status=%#x\n",
633 channel_readl(dc, CSR));
634
635 tasklet_schedule(&dc->tasklet);
636 /*
637 * Just disable the interrupts. We'll turn them back on in the
638 * softirq handler.
639 */
640 disable_irq_nosync(irq);
641
642 return IRQ_HANDLED;
643}
644
645static void txx9dmac_tasklet(unsigned long data)
646{
647 int irq;
648 u32 csr;
649 struct txx9dmac_chan *dc;
650
651 struct txx9dmac_dev *ddev = (struct txx9dmac_dev *)data;
652 u32 mcr;
653 int i;
654
655 mcr = dma_readl(ddev, MCR);
656 dev_vdbg(ddev->chan[0]->dma.dev, "tasklet: mcr=%x\n", mcr);
657 for (i = 0; i < TXX9_DMA_MAX_NR_CHANNELS; i++) {
658 if ((mcr >> (24 + i)) & 0x11) {
659 dc = ddev->chan[i];
660 csr = channel_readl(dc, CSR);
661 dev_vdbg(chan2dev(&dc->chan), "tasklet: status=%x\n",
662 csr);
663 spin_lock(&dc->lock);
664 if (csr & (TXX9_DMA_CSR_ABCHC | TXX9_DMA_CSR_NCHNC |
665 TXX9_DMA_CSR_NTRNFC))
666 txx9dmac_scan_descriptors(dc);
667 spin_unlock(&dc->lock);
668 }
669 }
670 irq = ddev->irq;
671
672 enable_irq(irq);
673}
674
675static irqreturn_t txx9dmac_interrupt(int irq, void *dev_id)
676{
677 struct txx9dmac_dev *ddev = dev_id;
678
679 dev_vdbg(ddev->chan[0]->dma.dev, "interrupt: status=%#x\n",
680 dma_readl(ddev, MCR));
681
682 tasklet_schedule(&ddev->tasklet);
683 /*
684 * Just disable the interrupts. We'll turn them back on in the
685 * softirq handler.
686 */
687 disable_irq_nosync(irq);
688
689 return IRQ_HANDLED;
690}
691
692/*----------------------------------------------------------------------*/
693
694static dma_cookie_t txx9dmac_tx_submit(struct dma_async_tx_descriptor *tx)
695{
696 struct txx9dmac_desc *desc = txd_to_txx9dmac_desc(tx);
697 struct txx9dmac_chan *dc = to_txx9dmac_chan(tx->chan);
698 dma_cookie_t cookie;
699
700 spin_lock_bh(&dc->lock);
701 cookie = dma_cookie_assign(tx);
702
703 dev_vdbg(chan2dev(tx->chan), "tx_submit: queued %u %p\n",
704 desc->txd.cookie, desc);
705
706 list_add_tail(&desc->desc_node, &dc->queue);
707 spin_unlock_bh(&dc->lock);
708
709 return cookie;
710}
711
712static struct dma_async_tx_descriptor *
713txx9dmac_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
714 size_t len, unsigned long flags)
715{
716 struct txx9dmac_chan *dc = to_txx9dmac_chan(chan);
717 struct txx9dmac_dev *ddev = dc->ddev;
718 struct txx9dmac_desc *desc;
719 struct txx9dmac_desc *first;
720 struct txx9dmac_desc *prev;
721 size_t xfer_count;
722 size_t offset;
723
724 dev_vdbg(chan2dev(chan), "prep_dma_memcpy d%#llx s%#llx l%#zx f%#lx\n",
725 (u64)dest, (u64)src, len, flags);
726
727 if (unlikely(!len)) {
728 dev_dbg(chan2dev(chan), "prep_dma_memcpy: length is zero!\n");
729 return NULL;
730 }
731
732 prev = first = NULL;
733
734 for (offset = 0; offset < len; offset += xfer_count) {
735 xfer_count = min_t(size_t, len - offset, TXX9_DMA_MAX_COUNT);
736 /*
737 * Workaround for ERT-TX49H2-033, ERT-TX49H3-020,
738 * ERT-TX49H4-016 (slightly conservative)
739 */
740 if (__is_dmac64(ddev)) {
741 if (xfer_count > 0x100 &&
742 (xfer_count & 0xff) >= 0xfa &&
743 (xfer_count & 0xff) <= 0xff)
744 xfer_count -= 0x20;
745 } else {
746 if (xfer_count > 0x80 &&
747 (xfer_count & 0x7f) >= 0x7e &&
748 (xfer_count & 0x7f) <= 0x7f)
749 xfer_count -= 0x20;
750 }
751
752 desc = txx9dmac_desc_get(dc);
753 if (!desc) {
754 txx9dmac_desc_put(dc, first);
755 return NULL;
756 }
757
758 if (__is_dmac64(ddev)) {
759 desc->hwdesc.SAR = src + offset;
760 desc->hwdesc.DAR = dest + offset;
761 desc->hwdesc.CNTR = xfer_count;
762 txx9dmac_desc_set_nosimple(ddev, desc, 8, 8,
763 dc->ccr | TXX9_DMA_CCR_XFACT);
764 } else {
765 desc->hwdesc32.SAR = src + offset;
766 desc->hwdesc32.DAR = dest + offset;
767 desc->hwdesc32.CNTR = xfer_count;
768 txx9dmac_desc_set_nosimple(ddev, desc, 4, 4,
769 dc->ccr | TXX9_DMA_CCR_XFACT);
770 }
771
772 /*
773 * The descriptors on tx_list are not reachable from
774 * the dc->queue list or dc->active_list after a
775 * submit. If we put all descriptors on active_list,
776 * calling of callback on the completion will be more
777 * complex.
778 */
779 if (!first) {
780 first = desc;
781 } else {
782 desc_write_CHAR(dc, prev, desc->txd.phys);
783 dma_sync_single_for_device(chan2parent(&dc->chan),
784 prev->txd.phys, ddev->descsize,
785 DMA_TO_DEVICE);
786 list_add_tail(&desc->desc_node, &first->tx_list);
787 }
788 prev = desc;
789 }
790
791 /* Trigger interrupt after last block */
792 if (flags & DMA_PREP_INTERRUPT)
793 txx9dmac_desc_set_INTENT(ddev, prev);
794
795 desc_write_CHAR(dc, prev, 0);
796 dma_sync_single_for_device(chan2parent(&dc->chan),
797 prev->txd.phys, ddev->descsize,
798 DMA_TO_DEVICE);
799
800 first->txd.flags = flags;
801 first->len = len;
802
803 return &first->txd;
804}
805
806static struct dma_async_tx_descriptor *
807txx9dmac_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
808 unsigned int sg_len, enum dma_transfer_direction direction,
809 unsigned long flags, void *context)
810{
811 struct txx9dmac_chan *dc = to_txx9dmac_chan(chan);
812 struct txx9dmac_dev *ddev = dc->ddev;
813 struct txx9dmac_slave *ds = chan->private;
814 struct txx9dmac_desc *prev;
815 struct txx9dmac_desc *first;
816 unsigned int i;
817 struct scatterlist *sg;
818
819 dev_vdbg(chan2dev(chan), "prep_dma_slave\n");
820
821 BUG_ON(!ds || !ds->reg_width);
822 if (ds->tx_reg)
823 BUG_ON(direction != DMA_MEM_TO_DEV);
824 else
825 BUG_ON(direction != DMA_DEV_TO_MEM);
826 if (unlikely(!sg_len))
827 return NULL;
828
829 prev = first = NULL;
830
831 for_each_sg(sgl, sg, sg_len, i) {
832 struct txx9dmac_desc *desc;
833 dma_addr_t mem;
834 u32 sai, dai;
835
836 desc = txx9dmac_desc_get(dc);
837 if (!desc) {
838 txx9dmac_desc_put(dc, first);
839 return NULL;
840 }
841
842 mem = sg_dma_address(sg);
843
844 if (__is_dmac64(ddev)) {
845 if (direction == DMA_MEM_TO_DEV) {
846 desc->hwdesc.SAR = mem;
847 desc->hwdesc.DAR = ds->tx_reg;
848 } else {
849 desc->hwdesc.SAR = ds->rx_reg;
850 desc->hwdesc.DAR = mem;
851 }
852 desc->hwdesc.CNTR = sg_dma_len(sg);
853 } else {
854 if (direction == DMA_MEM_TO_DEV) {
855 desc->hwdesc32.SAR = mem;
856 desc->hwdesc32.DAR = ds->tx_reg;
857 } else {
858 desc->hwdesc32.SAR = ds->rx_reg;
859 desc->hwdesc32.DAR = mem;
860 }
861 desc->hwdesc32.CNTR = sg_dma_len(sg);
862 }
863 if (direction == DMA_MEM_TO_DEV) {
864 sai = ds->reg_width;
865 dai = 0;
866 } else {
867 sai = 0;
868 dai = ds->reg_width;
869 }
870 txx9dmac_desc_set_nosimple(ddev, desc, sai, dai,
871 dc->ccr | TXX9_DMA_CCR_XFACT);
872
873 if (!first) {
874 first = desc;
875 } else {
876 desc_write_CHAR(dc, prev, desc->txd.phys);
877 dma_sync_single_for_device(chan2parent(&dc->chan),
878 prev->txd.phys,
879 ddev->descsize,
880 DMA_TO_DEVICE);
881 list_add_tail(&desc->desc_node, &first->tx_list);
882 }
883 prev = desc;
884 }
885
886 /* Trigger interrupt after last block */
887 if (flags & DMA_PREP_INTERRUPT)
888 txx9dmac_desc_set_INTENT(ddev, prev);
889
890 desc_write_CHAR(dc, prev, 0);
891 dma_sync_single_for_device(chan2parent(&dc->chan),
892 prev->txd.phys, ddev->descsize,
893 DMA_TO_DEVICE);
894
895 first->txd.flags = flags;
896 first->len = 0;
897
898 return &first->txd;
899}
900
901static int txx9dmac_terminate_all(struct dma_chan *chan)
902{
903 struct txx9dmac_chan *dc = to_txx9dmac_chan(chan);
904 struct txx9dmac_desc *desc, *_desc;
905 LIST_HEAD(list);
906
907 dev_vdbg(chan2dev(chan), "terminate_all\n");
908 spin_lock_bh(&dc->lock);
909
910 txx9dmac_reset_chan(dc);
911
912 /* active_list entries will end up before queued entries */
913 list_splice_init(&dc->queue, &list);
914 list_splice_init(&dc->active_list, &list);
915
916 spin_unlock_bh(&dc->lock);
917
918 /* Flush all pending and queued descriptors */
919 list_for_each_entry_safe(desc, _desc, &list, desc_node)
920 txx9dmac_descriptor_complete(dc, desc);
921
922 return 0;
923}
924
925static enum dma_status
926txx9dmac_tx_status(struct dma_chan *chan, dma_cookie_t cookie,
927 struct dma_tx_state *txstate)
928{
929 struct txx9dmac_chan *dc = to_txx9dmac_chan(chan);
930 enum dma_status ret;
931
932 ret = dma_cookie_status(chan, cookie, txstate);
933 if (ret == DMA_COMPLETE)
934 return DMA_COMPLETE;
935
936 spin_lock_bh(&dc->lock);
937 txx9dmac_scan_descriptors(dc);
938 spin_unlock_bh(&dc->lock);
939
940 return dma_cookie_status(chan, cookie, txstate);
941}
942
943static void txx9dmac_chain_dynamic(struct txx9dmac_chan *dc,
944 struct txx9dmac_desc *prev)
945{
946 struct txx9dmac_dev *ddev = dc->ddev;
947 struct txx9dmac_desc *desc;
948 LIST_HEAD(list);
949
950 prev = txx9dmac_last_child(prev);
951 txx9dmac_dequeue(dc, &list);
952 desc = list_entry(list.next, struct txx9dmac_desc, desc_node);
953 desc_write_CHAR(dc, prev, desc->txd.phys);
954 dma_sync_single_for_device(chan2parent(&dc->chan),
955 prev->txd.phys, ddev->descsize,
956 DMA_TO_DEVICE);
957 mmiowb();
958 if (!(channel_readl(dc, CSR) & TXX9_DMA_CSR_CHNEN) &&
959 channel_read_CHAR(dc) == prev->txd.phys)
960 /* Restart chain DMA */
961 channel_write_CHAR(dc, desc->txd.phys);
962 list_splice_tail(&list, &dc->active_list);
963}
964
965static void txx9dmac_issue_pending(struct dma_chan *chan)
966{
967 struct txx9dmac_chan *dc = to_txx9dmac_chan(chan);
968
969 spin_lock_bh(&dc->lock);
970
971 if (!list_empty(&dc->active_list))
972 txx9dmac_scan_descriptors(dc);
973 if (!list_empty(&dc->queue)) {
974 if (list_empty(&dc->active_list)) {
975 txx9dmac_dequeue(dc, &dc->active_list);
976 txx9dmac_dostart(dc, txx9dmac_first_active(dc));
977 } else if (txx9_dma_have_SMPCHN()) {
978 struct txx9dmac_desc *prev = txx9dmac_last_active(dc);
979
980 if (!(prev->txd.flags & DMA_PREP_INTERRUPT) ||
981 txx9dmac_chan_INTENT(dc))
982 txx9dmac_chain_dynamic(dc, prev);
983 }
984 }
985
986 spin_unlock_bh(&dc->lock);
987}
988
989static int txx9dmac_alloc_chan_resources(struct dma_chan *chan)
990{
991 struct txx9dmac_chan *dc = to_txx9dmac_chan(chan);
992 struct txx9dmac_slave *ds = chan->private;
993 struct txx9dmac_desc *desc;
994 int i;
995
996 dev_vdbg(chan2dev(chan), "alloc_chan_resources\n");
997
998 /* ASSERT: channel is idle */
999 if (channel_readl(dc, CSR) & TXX9_DMA_CSR_XFACT) {
1000 dev_dbg(chan2dev(chan), "DMA channel not idle?\n");
1001 return -EIO;
1002 }
1003
1004 dma_cookie_init(chan);
1005
1006 dc->ccr = TXX9_DMA_CCR_IMMCHN | TXX9_DMA_CCR_INTENE | CCR_LE;
1007 txx9dmac_chan_set_SMPCHN(dc);
1008 if (!txx9_dma_have_SMPCHN() || (dc->ccr & TXX9_DMA_CCR_SMPCHN))
1009 dc->ccr |= TXX9_DMA_CCR_INTENC;
1010 if (chan->device->device_prep_dma_memcpy) {
1011 if (ds)
1012 return -EINVAL;
1013 dc->ccr |= TXX9_DMA_CCR_XFSZ_X8;
1014 } else {
1015 if (!ds ||
1016 (ds->tx_reg && ds->rx_reg) || (!ds->tx_reg && !ds->rx_reg))
1017 return -EINVAL;
1018 dc->ccr |= TXX9_DMA_CCR_EXTRQ |
1019 TXX9_DMA_CCR_XFSZ(__ffs(ds->reg_width));
1020 txx9dmac_chan_set_INTENT(dc);
1021 }
1022
1023 spin_lock_bh(&dc->lock);
1024 i = dc->descs_allocated;
1025 while (dc->descs_allocated < TXX9_DMA_INITIAL_DESC_COUNT) {
1026 spin_unlock_bh(&dc->lock);
1027
1028 desc = txx9dmac_desc_alloc(dc, GFP_KERNEL);
1029 if (!desc) {
1030 dev_info(chan2dev(chan),
1031 "only allocated %d descriptors\n", i);
1032 spin_lock_bh(&dc->lock);
1033 break;
1034 }
1035 txx9dmac_desc_put(dc, desc);
1036
1037 spin_lock_bh(&dc->lock);
1038 i = ++dc->descs_allocated;
1039 }
1040 spin_unlock_bh(&dc->lock);
1041
1042 dev_dbg(chan2dev(chan),
1043 "alloc_chan_resources allocated %d descriptors\n", i);
1044
1045 return i;
1046}
1047
1048static void txx9dmac_free_chan_resources(struct dma_chan *chan)
1049{
1050 struct txx9dmac_chan *dc = to_txx9dmac_chan(chan);
1051 struct txx9dmac_dev *ddev = dc->ddev;
1052 struct txx9dmac_desc *desc, *_desc;
1053 LIST_HEAD(list);
1054
1055 dev_dbg(chan2dev(chan), "free_chan_resources (descs allocated=%u)\n",
1056 dc->descs_allocated);
1057
1058 /* ASSERT: channel is idle */
1059 BUG_ON(!list_empty(&dc->active_list));
1060 BUG_ON(!list_empty(&dc->queue));
1061 BUG_ON(channel_readl(dc, CSR) & TXX9_DMA_CSR_XFACT);
1062
1063 spin_lock_bh(&dc->lock);
1064 list_splice_init(&dc->free_list, &list);
1065 dc->descs_allocated = 0;
1066 spin_unlock_bh(&dc->lock);
1067
1068 list_for_each_entry_safe(desc, _desc, &list, desc_node) {
1069 dev_vdbg(chan2dev(chan), " freeing descriptor %p\n", desc);
1070 dma_unmap_single(chan2parent(chan), desc->txd.phys,
1071 ddev->descsize, DMA_TO_DEVICE);
1072 kfree(desc);
1073 }
1074
1075 dev_vdbg(chan2dev(chan), "free_chan_resources done\n");
1076}
1077
1078/*----------------------------------------------------------------------*/
1079
1080static void txx9dmac_off(struct txx9dmac_dev *ddev)
1081{
1082 dma_writel(ddev, MCR, 0);
1083 mmiowb();
1084}
1085
1086static int __init txx9dmac_chan_probe(struct platform_device *pdev)
1087{
1088 struct txx9dmac_chan_platform_data *cpdata =
1089 dev_get_platdata(&pdev->dev);
1090 struct platform_device *dmac_dev = cpdata->dmac_dev;
1091 struct txx9dmac_platform_data *pdata = dev_get_platdata(&dmac_dev->dev);
1092 struct txx9dmac_chan *dc;
1093 int err;
1094 int ch = pdev->id % TXX9_DMA_MAX_NR_CHANNELS;
1095 int irq;
1096
1097 dc = devm_kzalloc(&pdev->dev, sizeof(*dc), GFP_KERNEL);
1098 if (!dc)
1099 return -ENOMEM;
1100
1101 dc->dma.dev = &pdev->dev;
1102 dc->dma.device_alloc_chan_resources = txx9dmac_alloc_chan_resources;
1103 dc->dma.device_free_chan_resources = txx9dmac_free_chan_resources;
1104 dc->dma.device_terminate_all = txx9dmac_terminate_all;
1105 dc->dma.device_tx_status = txx9dmac_tx_status;
1106 dc->dma.device_issue_pending = txx9dmac_issue_pending;
1107 if (pdata && pdata->memcpy_chan == ch) {
1108 dc->dma.device_prep_dma_memcpy = txx9dmac_prep_dma_memcpy;
1109 dma_cap_set(DMA_MEMCPY, dc->dma.cap_mask);
1110 } else {
1111 dc->dma.device_prep_slave_sg = txx9dmac_prep_slave_sg;
1112 dma_cap_set(DMA_SLAVE, dc->dma.cap_mask);
1113 dma_cap_set(DMA_PRIVATE, dc->dma.cap_mask);
1114 }
1115
1116 INIT_LIST_HEAD(&dc->dma.channels);
1117 dc->ddev = platform_get_drvdata(dmac_dev);
1118 if (dc->ddev->irq < 0) {
1119 irq = platform_get_irq(pdev, 0);
1120 if (irq < 0)
1121 return irq;
1122 tasklet_init(&dc->tasklet, txx9dmac_chan_tasklet,
1123 (unsigned long)dc);
1124 dc->irq = irq;
1125 err = devm_request_irq(&pdev->dev, dc->irq,
1126 txx9dmac_chan_interrupt, 0, dev_name(&pdev->dev), dc);
1127 if (err)
1128 return err;
1129 } else
1130 dc->irq = -1;
1131 dc->ddev->chan[ch] = dc;
1132 dc->chan.device = &dc->dma;
1133 list_add_tail(&dc->chan.device_node, &dc->chan.device->channels);
1134 dma_cookie_init(&dc->chan);
1135
1136 if (is_dmac64(dc))
1137 dc->ch_regs = &__txx9dmac_regs(dc->ddev)->CHAN[ch];
1138 else
1139 dc->ch_regs = &__txx9dmac_regs32(dc->ddev)->CHAN[ch];
1140 spin_lock_init(&dc->lock);
1141
1142 INIT_LIST_HEAD(&dc->active_list);
1143 INIT_LIST_HEAD(&dc->queue);
1144 INIT_LIST_HEAD(&dc->free_list);
1145
1146 txx9dmac_reset_chan(dc);
1147
1148 platform_set_drvdata(pdev, dc);
1149
1150 err = dma_async_device_register(&dc->dma);
1151 if (err)
1152 return err;
1153 dev_dbg(&pdev->dev, "TXx9 DMA Channel (dma%d%s%s)\n",
1154 dc->dma.dev_id,
1155 dma_has_cap(DMA_MEMCPY, dc->dma.cap_mask) ? " memcpy" : "",
1156 dma_has_cap(DMA_SLAVE, dc->dma.cap_mask) ? " slave" : "");
1157
1158 return 0;
1159}
1160
1161static int txx9dmac_chan_remove(struct platform_device *pdev)
1162{
1163 struct txx9dmac_chan *dc = platform_get_drvdata(pdev);
1164
1165
1166 dma_async_device_unregister(&dc->dma);
1167 if (dc->irq >= 0) {
1168 devm_free_irq(&pdev->dev, dc->irq, dc);
1169 tasklet_kill(&dc->tasklet);
1170 }
1171 dc->ddev->chan[pdev->id % TXX9_DMA_MAX_NR_CHANNELS] = NULL;
1172 return 0;
1173}
1174
1175static int __init txx9dmac_probe(struct platform_device *pdev)
1176{
1177 struct txx9dmac_platform_data *pdata = dev_get_platdata(&pdev->dev);
1178 struct resource *io;
1179 struct txx9dmac_dev *ddev;
1180 u32 mcr;
1181 int err;
1182
1183 io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1184 if (!io)
1185 return -EINVAL;
1186
1187 ddev = devm_kzalloc(&pdev->dev, sizeof(*ddev), GFP_KERNEL);
1188 if (!ddev)
1189 return -ENOMEM;
1190
1191 if (!devm_request_mem_region(&pdev->dev, io->start, resource_size(io),
1192 dev_name(&pdev->dev)))
1193 return -EBUSY;
1194
1195 ddev->regs = devm_ioremap(&pdev->dev, io->start, resource_size(io));
1196 if (!ddev->regs)
1197 return -ENOMEM;
1198 ddev->have_64bit_regs = pdata->have_64bit_regs;
1199 if (__is_dmac64(ddev))
1200 ddev->descsize = sizeof(struct txx9dmac_hwdesc);
1201 else
1202 ddev->descsize = sizeof(struct txx9dmac_hwdesc32);
1203
1204 /* force dma off, just in case */
1205 txx9dmac_off(ddev);
1206
1207 ddev->irq = platform_get_irq(pdev, 0);
1208 if (ddev->irq >= 0) {
1209 tasklet_init(&ddev->tasklet, txx9dmac_tasklet,
1210 (unsigned long)ddev);
1211 err = devm_request_irq(&pdev->dev, ddev->irq,
1212 txx9dmac_interrupt, 0, dev_name(&pdev->dev), ddev);
1213 if (err)
1214 return err;
1215 }
1216
1217 mcr = TXX9_DMA_MCR_MSTEN | MCR_LE;
1218 if (pdata && pdata->memcpy_chan >= 0)
1219 mcr |= TXX9_DMA_MCR_FIFUM(pdata->memcpy_chan);
1220 dma_writel(ddev, MCR, mcr);
1221
1222 platform_set_drvdata(pdev, ddev);
1223 return 0;
1224}
1225
1226static int txx9dmac_remove(struct platform_device *pdev)
1227{
1228 struct txx9dmac_dev *ddev = platform_get_drvdata(pdev);
1229
1230 txx9dmac_off(ddev);
1231 if (ddev->irq >= 0) {
1232 devm_free_irq(&pdev->dev, ddev->irq, ddev);
1233 tasklet_kill(&ddev->tasklet);
1234 }
1235 return 0;
1236}
1237
1238static void txx9dmac_shutdown(struct platform_device *pdev)
1239{
1240 struct txx9dmac_dev *ddev = platform_get_drvdata(pdev);
1241
1242 txx9dmac_off(ddev);
1243}
1244
1245static int txx9dmac_suspend_noirq(struct device *dev)
1246{
1247 struct platform_device *pdev = to_platform_device(dev);
1248 struct txx9dmac_dev *ddev = platform_get_drvdata(pdev);
1249
1250 txx9dmac_off(ddev);
1251 return 0;
1252}
1253
1254static int txx9dmac_resume_noirq(struct device *dev)
1255{
1256 struct platform_device *pdev = to_platform_device(dev);
1257 struct txx9dmac_dev *ddev = platform_get_drvdata(pdev);
1258 struct txx9dmac_platform_data *pdata = dev_get_platdata(&pdev->dev);
1259 u32 mcr;
1260
1261 mcr = TXX9_DMA_MCR_MSTEN | MCR_LE;
1262 if (pdata && pdata->memcpy_chan >= 0)
1263 mcr |= TXX9_DMA_MCR_FIFUM(pdata->memcpy_chan);
1264 dma_writel(ddev, MCR, mcr);
1265 return 0;
1266
1267}
1268
1269static const struct dev_pm_ops txx9dmac_dev_pm_ops = {
1270 .suspend_noirq = txx9dmac_suspend_noirq,
1271 .resume_noirq = txx9dmac_resume_noirq,
1272};
1273
1274static struct platform_driver txx9dmac_chan_driver = {
1275 .remove = txx9dmac_chan_remove,
1276 .driver = {
1277 .name = "txx9dmac-chan",
1278 },
1279};
1280
1281static struct platform_driver txx9dmac_driver = {
1282 .remove = txx9dmac_remove,
1283 .shutdown = txx9dmac_shutdown,
1284 .driver = {
1285 .name = "txx9dmac",
1286 .pm = &txx9dmac_dev_pm_ops,
1287 },
1288};
1289
1290static int __init txx9dmac_init(void)
1291{
1292 int rc;
1293
1294 rc = platform_driver_probe(&txx9dmac_driver, txx9dmac_probe);
1295 if (!rc) {
1296 rc = platform_driver_probe(&txx9dmac_chan_driver,
1297 txx9dmac_chan_probe);
1298 if (rc)
1299 platform_driver_unregister(&txx9dmac_driver);
1300 }
1301 return rc;
1302}
1303module_init(txx9dmac_init);
1304
1305static void __exit txx9dmac_exit(void)
1306{
1307 platform_driver_unregister(&txx9dmac_chan_driver);
1308 platform_driver_unregister(&txx9dmac_driver);
1309}
1310module_exit(txx9dmac_exit);
1311
1312MODULE_LICENSE("GPL");
1313MODULE_DESCRIPTION("TXx9 DMA Controller driver");
1314MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>");
1315MODULE_ALIAS("platform:txx9dmac");
1316MODULE_ALIAS("platform:txx9dmac-chan");