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-rw-r--r--drivers/dma/shdma.c1477
-rw-r--r--drivers/dma/shdma.h60
2 files changed, 1537 insertions, 0 deletions
diff --git a/drivers/dma/shdma.c b/drivers/dma/shdma.c
new file mode 100644
index 00000000000..7f49235d14b
--- /dev/null
+++ b/drivers/dma/shdma.c
@@ -0,0 +1,1477 @@
1/*
2 * Renesas SuperH DMA Engine support
3 *
4 * base is drivers/dma/flsdma.c
5 *
6 * Copyright (C) 2009 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>
7 * Copyright (C) 2009 Renesas Solutions, Inc. All rights reserved.
8 * Copyright (C) 2007 Freescale Semiconductor, Inc. All rights reserved.
9 *
10 * This is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * - DMA of SuperH does not have Hardware DMA chain mode.
16 * - MAX DMA size is 16MB.
17 *
18 */
19
20#include <linux/init.h>
21#include <linux/module.h>
22#include <linux/slab.h>
23#include <linux/interrupt.h>
24#include <linux/dmaengine.h>
25#include <linux/delay.h>
26#include <linux/dma-mapping.h>
27#include <linux/platform_device.h>
28#include <linux/pm_runtime.h>
29#include <linux/sh_dma.h>
30#include <linux/notifier.h>
31#include <linux/kdebug.h>
32#include <linux/spinlock.h>
33#include <linux/rculist.h>
34#include "shdma.h"
35
36/* DMA descriptor control */
37enum sh_dmae_desc_status {
38 DESC_IDLE,
39 DESC_PREPARED,
40 DESC_SUBMITTED,
41 DESC_COMPLETED, /* completed, have to call callback */
42 DESC_WAITING, /* callback called, waiting for ack / re-submit */
43};
44
45#define NR_DESCS_PER_CHANNEL 32
46/* Default MEMCPY transfer size = 2^2 = 4 bytes */
47#define LOG2_DEFAULT_XFER_SIZE 2
48
49/*
50 * Used for write-side mutual exclusion for the global device list,
51 * read-side synchronization by way of RCU, and per-controller data.
52 */
53static DEFINE_SPINLOCK(sh_dmae_lock);
54static LIST_HEAD(sh_dmae_devices);
55
56/* A bitmask with bits enough for enum sh_dmae_slave_chan_id */
57static unsigned long sh_dmae_slave_used[BITS_TO_LONGS(SH_DMA_SLAVE_NUMBER)];
58
59static void sh_dmae_chan_ld_cleanup(struct sh_dmae_chan *sh_chan, bool all);
60
61static void sh_dmae_writel(struct sh_dmae_chan *sh_dc, u32 data, u32 reg)
62{
63 __raw_writel(data, sh_dc->base + reg / sizeof(u32));
64}
65
66static u32 sh_dmae_readl(struct sh_dmae_chan *sh_dc, u32 reg)
67{
68 return __raw_readl(sh_dc->base + reg / sizeof(u32));
69}
70
71static u16 dmaor_read(struct sh_dmae_device *shdev)
72{
73 u32 __iomem *addr = shdev->chan_reg + DMAOR / sizeof(u32);
74
75 if (shdev->pdata->dmaor_is_32bit)
76 return __raw_readl(addr);
77 else
78 return __raw_readw(addr);
79}
80
81static void dmaor_write(struct sh_dmae_device *shdev, u16 data)
82{
83 u32 __iomem *addr = shdev->chan_reg + DMAOR / sizeof(u32);
84
85 if (shdev->pdata->dmaor_is_32bit)
86 __raw_writel(data, addr);
87 else
88 __raw_writew(data, addr);
89}
90
91static void chcr_write(struct sh_dmae_chan *sh_dc, u32 data)
92{
93 struct sh_dmae_device *shdev = to_sh_dev(sh_dc);
94
95 __raw_writel(data, sh_dc->base + shdev->chcr_offset / sizeof(u32));
96}
97
98static u32 chcr_read(struct sh_dmae_chan *sh_dc)
99{
100 struct sh_dmae_device *shdev = to_sh_dev(sh_dc);
101
102 return __raw_readl(sh_dc->base + shdev->chcr_offset / sizeof(u32));
103}
104
105/*
106 * Reset DMA controller
107 *
108 * SH7780 has two DMAOR register
109 */
110static void sh_dmae_ctl_stop(struct sh_dmae_device *shdev)
111{
112 unsigned short dmaor;
113 unsigned long flags;
114
115 spin_lock_irqsave(&sh_dmae_lock, flags);
116
117 dmaor = dmaor_read(shdev);
118 dmaor_write(shdev, dmaor & ~(DMAOR_NMIF | DMAOR_AE | DMAOR_DME));
119
120 spin_unlock_irqrestore(&sh_dmae_lock, flags);
121}
122
123static int sh_dmae_rst(struct sh_dmae_device *shdev)
124{
125 unsigned short dmaor;
126 unsigned long flags;
127
128 spin_lock_irqsave(&sh_dmae_lock, flags);
129
130 dmaor = dmaor_read(shdev) & ~(DMAOR_NMIF | DMAOR_AE | DMAOR_DME);
131
132 dmaor_write(shdev, dmaor | shdev->pdata->dmaor_init);
133
134 dmaor = dmaor_read(shdev);
135
136 spin_unlock_irqrestore(&sh_dmae_lock, flags);
137
138 if (dmaor & (DMAOR_AE | DMAOR_NMIF)) {
139 dev_warn(shdev->common.dev, "Can't initialize DMAOR.\n");
140 return -EIO;
141 }
142 return 0;
143}
144
145static bool dmae_is_busy(struct sh_dmae_chan *sh_chan)
146{
147 u32 chcr = chcr_read(sh_chan);
148
149 if ((chcr & (CHCR_DE | CHCR_TE)) == CHCR_DE)
150 return true; /* working */
151
152 return false; /* waiting */
153}
154
155static unsigned int calc_xmit_shift(struct sh_dmae_chan *sh_chan, u32 chcr)
156{
157 struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
158 struct sh_dmae_pdata *pdata = shdev->pdata;
159 int cnt = ((chcr & pdata->ts_low_mask) >> pdata->ts_low_shift) |
160 ((chcr & pdata->ts_high_mask) >> pdata->ts_high_shift);
161
162 if (cnt >= pdata->ts_shift_num)
163 cnt = 0;
164
165 return pdata->ts_shift[cnt];
166}
167
168static u32 log2size_to_chcr(struct sh_dmae_chan *sh_chan, int l2size)
169{
170 struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
171 struct sh_dmae_pdata *pdata = shdev->pdata;
172 int i;
173
174 for (i = 0; i < pdata->ts_shift_num; i++)
175 if (pdata->ts_shift[i] == l2size)
176 break;
177
178 if (i == pdata->ts_shift_num)
179 i = 0;
180
181 return ((i << pdata->ts_low_shift) & pdata->ts_low_mask) |
182 ((i << pdata->ts_high_shift) & pdata->ts_high_mask);
183}
184
185static void dmae_set_reg(struct sh_dmae_chan *sh_chan, struct sh_dmae_regs *hw)
186{
187 sh_dmae_writel(sh_chan, hw->sar, SAR);
188 sh_dmae_writel(sh_chan, hw->dar, DAR);
189 sh_dmae_writel(sh_chan, hw->tcr >> sh_chan->xmit_shift, TCR);
190}
191
192static void dmae_start(struct sh_dmae_chan *sh_chan)
193{
194 struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
195 u32 chcr = chcr_read(sh_chan);
196
197 if (shdev->pdata->needs_tend_set)
198 sh_dmae_writel(sh_chan, 0xFFFFFFFF, TEND);
199
200 chcr |= CHCR_DE | shdev->chcr_ie_bit;
201 chcr_write(sh_chan, chcr & ~CHCR_TE);
202}
203
204static void dmae_halt(struct sh_dmae_chan *sh_chan)
205{
206 struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
207 u32 chcr = chcr_read(sh_chan);
208
209 chcr &= ~(CHCR_DE | CHCR_TE | shdev->chcr_ie_bit);
210 chcr_write(sh_chan, chcr);
211}
212
213static void dmae_init(struct sh_dmae_chan *sh_chan)
214{
215 /*
216 * Default configuration for dual address memory-memory transfer.
217 * 0x400 represents auto-request.
218 */
219 u32 chcr = DM_INC | SM_INC | 0x400 | log2size_to_chcr(sh_chan,
220 LOG2_DEFAULT_XFER_SIZE);
221 sh_chan->xmit_shift = calc_xmit_shift(sh_chan, chcr);
222 chcr_write(sh_chan, chcr);
223}
224
225static int dmae_set_chcr(struct sh_dmae_chan *sh_chan, u32 val)
226{
227 /* If DMA is active, cannot set CHCR. TODO: remove this superfluous check */
228 if (dmae_is_busy(sh_chan))
229 return -EBUSY;
230
231 sh_chan->xmit_shift = calc_xmit_shift(sh_chan, val);
232 chcr_write(sh_chan, val);
233
234 return 0;
235}
236
237static int dmae_set_dmars(struct sh_dmae_chan *sh_chan, u16 val)
238{
239 struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
240 struct sh_dmae_pdata *pdata = shdev->pdata;
241 const struct sh_dmae_channel *chan_pdata = &pdata->channel[sh_chan->id];
242 u16 __iomem *addr = shdev->dmars;
243 unsigned int shift = chan_pdata->dmars_bit;
244
245 if (dmae_is_busy(sh_chan))
246 return -EBUSY;
247
248 if (pdata->no_dmars)
249 return 0;
250
251 /* in the case of a missing DMARS resource use first memory window */
252 if (!addr)
253 addr = (u16 __iomem *)shdev->chan_reg;
254 addr += chan_pdata->dmars / sizeof(u16);
255
256 __raw_writew((__raw_readw(addr) & (0xff00 >> shift)) | (val << shift),
257 addr);
258
259 return 0;
260}
261
262static dma_cookie_t sh_dmae_tx_submit(struct dma_async_tx_descriptor *tx)
263{
264 struct sh_desc *desc = tx_to_sh_desc(tx), *chunk, *last = desc, *c;
265 struct sh_dmae_chan *sh_chan = to_sh_chan(tx->chan);
266 dma_async_tx_callback callback = tx->callback;
267 dma_cookie_t cookie;
268
269 spin_lock_bh(&sh_chan->desc_lock);
270
271 cookie = sh_chan->common.cookie;
272 cookie++;
273 if (cookie < 0)
274 cookie = 1;
275
276 sh_chan->common.cookie = cookie;
277 tx->cookie = cookie;
278
279 /* Mark all chunks of this descriptor as submitted, move to the queue */
280 list_for_each_entry_safe(chunk, c, desc->node.prev, node) {
281 /*
282 * All chunks are on the global ld_free, so, we have to find
283 * the end of the chain ourselves
284 */
285 if (chunk != desc && (chunk->mark == DESC_IDLE ||
286 chunk->async_tx.cookie > 0 ||
287 chunk->async_tx.cookie == -EBUSY ||
288 &chunk->node == &sh_chan->ld_free))
289 break;
290 chunk->mark = DESC_SUBMITTED;
291 /* Callback goes to the last chunk */
292 chunk->async_tx.callback = NULL;
293 chunk->cookie = cookie;
294 list_move_tail(&chunk->node, &sh_chan->ld_queue);
295 last = chunk;
296 }
297
298 last->async_tx.callback = callback;
299 last->async_tx.callback_param = tx->callback_param;
300
301 dev_dbg(sh_chan->dev, "submit #%d@%p on %d: %x[%d] -> %x\n",
302 tx->cookie, &last->async_tx, sh_chan->id,
303 desc->hw.sar, desc->hw.tcr, desc->hw.dar);
304
305 spin_unlock_bh(&sh_chan->desc_lock);
306
307 return cookie;
308}
309
310/* Called with desc_lock held */
311static struct sh_desc *sh_dmae_get_desc(struct sh_dmae_chan *sh_chan)
312{
313 struct sh_desc *desc;
314
315 list_for_each_entry(desc, &sh_chan->ld_free, node)
316 if (desc->mark != DESC_PREPARED) {
317 BUG_ON(desc->mark != DESC_IDLE);
318 list_del(&desc->node);
319 return desc;
320 }
321
322 return NULL;
323}
324
325static const struct sh_dmae_slave_config *sh_dmae_find_slave(
326 struct sh_dmae_chan *sh_chan, struct sh_dmae_slave *param)
327{
328 struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
329 struct sh_dmae_pdata *pdata = shdev->pdata;
330 int i;
331
332 if (param->slave_id >= SH_DMA_SLAVE_NUMBER)
333 return NULL;
334
335 for (i = 0; i < pdata->slave_num; i++)
336 if (pdata->slave[i].slave_id == param->slave_id)
337 return pdata->slave + i;
338
339 return NULL;
340}
341
342static int sh_dmae_alloc_chan_resources(struct dma_chan *chan)
343{
344 struct sh_dmae_chan *sh_chan = to_sh_chan(chan);
345 struct sh_desc *desc;
346 struct sh_dmae_slave *param = chan->private;
347 int ret;
348
349 pm_runtime_get_sync(sh_chan->dev);
350
351 /*
352 * This relies on the guarantee from dmaengine that alloc_chan_resources
353 * never runs concurrently with itself or free_chan_resources.
354 */
355 if (param) {
356 const struct sh_dmae_slave_config *cfg;
357
358 cfg = sh_dmae_find_slave(sh_chan, param);
359 if (!cfg) {
360 ret = -EINVAL;
361 goto efindslave;
362 }
363
364 if (test_and_set_bit(param->slave_id, sh_dmae_slave_used)) {
365 ret = -EBUSY;
366 goto etestused;
367 }
368
369 param->config = cfg;
370
371 dmae_set_dmars(sh_chan, cfg->mid_rid);
372 dmae_set_chcr(sh_chan, cfg->chcr);
373 } else {
374 dmae_init(sh_chan);
375 }
376
377 spin_lock_bh(&sh_chan->desc_lock);
378 while (sh_chan->descs_allocated < NR_DESCS_PER_CHANNEL) {
379 spin_unlock_bh(&sh_chan->desc_lock);
380 desc = kzalloc(sizeof(struct sh_desc), GFP_KERNEL);
381 if (!desc) {
382 spin_lock_bh(&sh_chan->desc_lock);
383 break;
384 }
385 dma_async_tx_descriptor_init(&desc->async_tx,
386 &sh_chan->common);
387 desc->async_tx.tx_submit = sh_dmae_tx_submit;
388 desc->mark = DESC_IDLE;
389
390 spin_lock_bh(&sh_chan->desc_lock);
391 list_add(&desc->node, &sh_chan->ld_free);
392 sh_chan->descs_allocated++;
393 }
394 spin_unlock_bh(&sh_chan->desc_lock);
395
396 if (!sh_chan->descs_allocated) {
397 ret = -ENOMEM;
398 goto edescalloc;
399 }
400
401 return sh_chan->descs_allocated;
402
403edescalloc:
404 if (param)
405 clear_bit(param->slave_id, sh_dmae_slave_used);
406etestused:
407efindslave:
408 pm_runtime_put(sh_chan->dev);
409 return ret;
410}
411
412/*
413 * sh_dma_free_chan_resources - Free all resources of the channel.
414 */
415static void sh_dmae_free_chan_resources(struct dma_chan *chan)
416{
417 struct sh_dmae_chan *sh_chan = to_sh_chan(chan);
418 struct sh_desc *desc, *_desc;
419 LIST_HEAD(list);
420 int descs = sh_chan->descs_allocated;
421
422 /* Protect against ISR */
423 spin_lock_irq(&sh_chan->desc_lock);
424 dmae_halt(sh_chan);
425 spin_unlock_irq(&sh_chan->desc_lock);
426
427 /* Now no new interrupts will occur */
428
429 /* Prepared and not submitted descriptors can still be on the queue */
430 if (!list_empty(&sh_chan->ld_queue))
431 sh_dmae_chan_ld_cleanup(sh_chan, true);
432
433 if (chan->private) {
434 /* The caller is holding dma_list_mutex */
435 struct sh_dmae_slave *param = chan->private;
436 clear_bit(param->slave_id, sh_dmae_slave_used);
437 chan->private = NULL;
438 }
439
440 spin_lock_bh(&sh_chan->desc_lock);
441
442 list_splice_init(&sh_chan->ld_free, &list);
443 sh_chan->descs_allocated = 0;
444
445 spin_unlock_bh(&sh_chan->desc_lock);
446
447 if (descs > 0)
448 pm_runtime_put(sh_chan->dev);
449
450 list_for_each_entry_safe(desc, _desc, &list, node)
451 kfree(desc);
452}
453
454/**
455 * sh_dmae_add_desc - get, set up and return one transfer descriptor
456 * @sh_chan: DMA channel
457 * @flags: DMA transfer flags
458 * @dest: destination DMA address, incremented when direction equals
459 * DMA_FROM_DEVICE or DMA_BIDIRECTIONAL
460 * @src: source DMA address, incremented when direction equals
461 * DMA_TO_DEVICE or DMA_BIDIRECTIONAL
462 * @len: DMA transfer length
463 * @first: if NULL, set to the current descriptor and cookie set to -EBUSY
464 * @direction: needed for slave DMA to decide which address to keep constant,
465 * equals DMA_BIDIRECTIONAL for MEMCPY
466 * Returns 0 or an error
467 * Locks: called with desc_lock held
468 */
469static struct sh_desc *sh_dmae_add_desc(struct sh_dmae_chan *sh_chan,
470 unsigned long flags, dma_addr_t *dest, dma_addr_t *src, size_t *len,
471 struct sh_desc **first, enum dma_data_direction direction)
472{
473 struct sh_desc *new;
474 size_t copy_size;
475
476 if (!*len)
477 return NULL;
478
479 /* Allocate the link descriptor from the free list */
480 new = sh_dmae_get_desc(sh_chan);
481 if (!new) {
482 dev_err(sh_chan->dev, "No free link descriptor available\n");
483 return NULL;
484 }
485
486 copy_size = min(*len, (size_t)SH_DMA_TCR_MAX + 1);
487
488 new->hw.sar = *src;
489 new->hw.dar = *dest;
490 new->hw.tcr = copy_size;
491
492 if (!*first) {
493 /* First desc */
494 new->async_tx.cookie = -EBUSY;
495 *first = new;
496 } else {
497 /* Other desc - invisible to the user */
498 new->async_tx.cookie = -EINVAL;
499 }
500
501 dev_dbg(sh_chan->dev,
502 "chaining (%u/%u)@%x -> %x with %p, cookie %d, shift %d\n",
503 copy_size, *len, *src, *dest, &new->async_tx,
504 new->async_tx.cookie, sh_chan->xmit_shift);
505
506 new->mark = DESC_PREPARED;
507 new->async_tx.flags = flags;
508 new->direction = direction;
509
510 *len -= copy_size;
511 if (direction == DMA_BIDIRECTIONAL || direction == DMA_TO_DEVICE)
512 *src += copy_size;
513 if (direction == DMA_BIDIRECTIONAL || direction == DMA_FROM_DEVICE)
514 *dest += copy_size;
515
516 return new;
517}
518
519/*
520 * sh_dmae_prep_sg - prepare transfer descriptors from an SG list
521 *
522 * Common routine for public (MEMCPY) and slave DMA. The MEMCPY case is also
523 * converted to scatter-gather to guarantee consistent locking and a correct
524 * list manipulation. For slave DMA direction carries the usual meaning, and,
525 * logically, the SG list is RAM and the addr variable contains slave address,
526 * e.g., the FIFO I/O register. For MEMCPY direction equals DMA_BIDIRECTIONAL
527 * and the SG list contains only one element and points at the source buffer.
528 */
529static struct dma_async_tx_descriptor *sh_dmae_prep_sg(struct sh_dmae_chan *sh_chan,
530 struct scatterlist *sgl, unsigned int sg_len, dma_addr_t *addr,
531 enum dma_data_direction direction, unsigned long flags)
532{
533 struct scatterlist *sg;
534 struct sh_desc *first = NULL, *new = NULL /* compiler... */;
535 LIST_HEAD(tx_list);
536 int chunks = 0;
537 int i;
538
539 if (!sg_len)
540 return NULL;
541
542 for_each_sg(sgl, sg, sg_len, i)
543 chunks += (sg_dma_len(sg) + SH_DMA_TCR_MAX) /
544 (SH_DMA_TCR_MAX + 1);
545
546 /* Have to lock the whole loop to protect against concurrent release */
547 spin_lock_bh(&sh_chan->desc_lock);
548
549 /*
550 * Chaining:
551 * first descriptor is what user is dealing with in all API calls, its
552 * cookie is at first set to -EBUSY, at tx-submit to a positive
553 * number
554 * if more than one chunk is needed further chunks have cookie = -EINVAL
555 * the last chunk, if not equal to the first, has cookie = -ENOSPC
556 * all chunks are linked onto the tx_list head with their .node heads
557 * only during this function, then they are immediately spliced
558 * back onto the free list in form of a chain
559 */
560 for_each_sg(sgl, sg, sg_len, i) {
561 dma_addr_t sg_addr = sg_dma_address(sg);
562 size_t len = sg_dma_len(sg);
563
564 if (!len)
565 goto err_get_desc;
566
567 do {
568 dev_dbg(sh_chan->dev, "Add SG #%d@%p[%d], dma %llx\n",
569 i, sg, len, (unsigned long long)sg_addr);
570
571 if (direction == DMA_FROM_DEVICE)
572 new = sh_dmae_add_desc(sh_chan, flags,
573 &sg_addr, addr, &len, &first,
574 direction);
575 else
576 new = sh_dmae_add_desc(sh_chan, flags,
577 addr, &sg_addr, &len, &first,
578 direction);
579 if (!new)
580 goto err_get_desc;
581
582 new->chunks = chunks--;
583 list_add_tail(&new->node, &tx_list);
584 } while (len);
585 }
586
587 if (new != first)
588 new->async_tx.cookie = -ENOSPC;
589
590 /* Put them back on the free list, so, they don't get lost */
591 list_splice_tail(&tx_list, &sh_chan->ld_free);
592
593 spin_unlock_bh(&sh_chan->desc_lock);
594
595 return &first->async_tx;
596
597err_get_desc:
598 list_for_each_entry(new, &tx_list, node)
599 new->mark = DESC_IDLE;
600 list_splice(&tx_list, &sh_chan->ld_free);
601
602 spin_unlock_bh(&sh_chan->desc_lock);
603
604 return NULL;
605}
606
607static struct dma_async_tx_descriptor *sh_dmae_prep_memcpy(
608 struct dma_chan *chan, dma_addr_t dma_dest, dma_addr_t dma_src,
609 size_t len, unsigned long flags)
610{
611 struct sh_dmae_chan *sh_chan;
612 struct scatterlist sg;
613
614 if (!chan || !len)
615 return NULL;
616
617 sh_chan = to_sh_chan(chan);
618
619 sg_init_table(&sg, 1);
620 sg_set_page(&sg, pfn_to_page(PFN_DOWN(dma_src)), len,
621 offset_in_page(dma_src));
622 sg_dma_address(&sg) = dma_src;
623 sg_dma_len(&sg) = len;
624
625 return sh_dmae_prep_sg(sh_chan, &sg, 1, &dma_dest, DMA_BIDIRECTIONAL,
626 flags);
627}
628
629static struct dma_async_tx_descriptor *sh_dmae_prep_slave_sg(
630 struct dma_chan *chan, struct scatterlist *sgl, unsigned int sg_len,
631 enum dma_data_direction direction, unsigned long flags)
632{
633 struct sh_dmae_slave *param;
634 struct sh_dmae_chan *sh_chan;
635 dma_addr_t slave_addr;
636
637 if (!chan)
638 return NULL;
639
640 sh_chan = to_sh_chan(chan);
641 param = chan->private;
642
643 /* Someone calling slave DMA on a public channel? */
644 if (!param || !sg_len) {
645 dev_warn(sh_chan->dev, "%s: bad parameter: %p, %d, %d\n",
646 __func__, param, sg_len, param ? param->slave_id : -1);
647 return NULL;
648 }
649
650 slave_addr = param->config->addr;
651
652 /*
653 * if (param != NULL), this is a successfully requested slave channel,
654 * therefore param->config != NULL too.
655 */
656 return sh_dmae_prep_sg(sh_chan, sgl, sg_len, &slave_addr,
657 direction, flags);
658}
659
660static int sh_dmae_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
661 unsigned long arg)
662{
663 struct sh_dmae_chan *sh_chan = to_sh_chan(chan);
664
665 /* Only supports DMA_TERMINATE_ALL */
666 if (cmd != DMA_TERMINATE_ALL)
667 return -ENXIO;
668
669 if (!chan)
670 return -EINVAL;
671
672 spin_lock_bh(&sh_chan->desc_lock);
673 dmae_halt(sh_chan);
674
675 if (!list_empty(&sh_chan->ld_queue)) {
676 /* Record partial transfer */
677 struct sh_desc *desc = list_entry(sh_chan->ld_queue.next,
678 struct sh_desc, node);
679 desc->partial = (desc->hw.tcr - sh_dmae_readl(sh_chan, TCR)) <<
680 sh_chan->xmit_shift;
681
682 }
683 spin_unlock_bh(&sh_chan->desc_lock);
684
685 sh_dmae_chan_ld_cleanup(sh_chan, true);
686
687 return 0;
688}
689
690static dma_async_tx_callback __ld_cleanup(struct sh_dmae_chan *sh_chan, bool all)
691{
692 struct sh_desc *desc, *_desc;
693 /* Is the "exposed" head of a chain acked? */
694 bool head_acked = false;
695 dma_cookie_t cookie = 0;
696 dma_async_tx_callback callback = NULL;
697 void *param = NULL;
698
699 spin_lock_bh(&sh_chan->desc_lock);
700 list_for_each_entry_safe(desc, _desc, &sh_chan->ld_queue, node) {
701 struct dma_async_tx_descriptor *tx = &desc->async_tx;
702
703 BUG_ON(tx->cookie > 0 && tx->cookie != desc->cookie);
704 BUG_ON(desc->mark != DESC_SUBMITTED &&
705 desc->mark != DESC_COMPLETED &&
706 desc->mark != DESC_WAITING);
707
708 /*
709 * queue is ordered, and we use this loop to (1) clean up all
710 * completed descriptors, and to (2) update descriptor flags of
711 * any chunks in a (partially) completed chain
712 */
713 if (!all && desc->mark == DESC_SUBMITTED &&
714 desc->cookie != cookie)
715 break;
716
717 if (tx->cookie > 0)
718 cookie = tx->cookie;
719
720 if (desc->mark == DESC_COMPLETED && desc->chunks == 1) {
721 if (sh_chan->completed_cookie != desc->cookie - 1)
722 dev_dbg(sh_chan->dev,
723 "Completing cookie %d, expected %d\n",
724 desc->cookie,
725 sh_chan->completed_cookie + 1);
726 sh_chan->completed_cookie = desc->cookie;
727 }
728
729 /* Call callback on the last chunk */
730 if (desc->mark == DESC_COMPLETED && tx->callback) {
731 desc->mark = DESC_WAITING;
732 callback = tx->callback;
733 param = tx->callback_param;
734 dev_dbg(sh_chan->dev, "descriptor #%d@%p on %d callback\n",
735 tx->cookie, tx, sh_chan->id);
736 BUG_ON(desc->chunks != 1);
737 break;
738 }
739
740 if (tx->cookie > 0 || tx->cookie == -EBUSY) {
741 if (desc->mark == DESC_COMPLETED) {
742 BUG_ON(tx->cookie < 0);
743 desc->mark = DESC_WAITING;
744 }
745 head_acked = async_tx_test_ack(tx);
746 } else {
747 switch (desc->mark) {
748 case DESC_COMPLETED:
749 desc->mark = DESC_WAITING;
750 /* Fall through */
751 case DESC_WAITING:
752 if (head_acked)
753 async_tx_ack(&desc->async_tx);
754 }
755 }
756
757 dev_dbg(sh_chan->dev, "descriptor %p #%d completed.\n",
758 tx, tx->cookie);
759
760 if (((desc->mark == DESC_COMPLETED ||
761 desc->mark == DESC_WAITING) &&
762 async_tx_test_ack(&desc->async_tx)) || all) {
763 /* Remove from ld_queue list */
764 desc->mark = DESC_IDLE;
765 list_move(&desc->node, &sh_chan->ld_free);
766 }
767 }
768
769 if (all && !callback)
770 /*
771 * Terminating and the loop completed normally: forgive
772 * uncompleted cookies
773 */
774 sh_chan->completed_cookie = sh_chan->common.cookie;
775
776 spin_unlock_bh(&sh_chan->desc_lock);
777
778 if (callback)
779 callback(param);
780
781 return callback;
782}
783
784/*
785 * sh_chan_ld_cleanup - Clean up link descriptors
786 *
787 * This function cleans up the ld_queue of DMA channel.
788 */
789static void sh_dmae_chan_ld_cleanup(struct sh_dmae_chan *sh_chan, bool all)
790{
791 while (__ld_cleanup(sh_chan, all))
792 ;
793}
794
795static void sh_chan_xfer_ld_queue(struct sh_dmae_chan *sh_chan)
796{
797 struct sh_desc *desc;
798
799 spin_lock_bh(&sh_chan->desc_lock);
800 /* DMA work check */
801 if (dmae_is_busy(sh_chan))
802 goto sh_chan_xfer_ld_queue_end;
803
804 /* Find the first not transferred descriptor */
805 list_for_each_entry(desc, &sh_chan->ld_queue, node)
806 if (desc->mark == DESC_SUBMITTED) {
807 dev_dbg(sh_chan->dev, "Queue #%d to %d: %u@%x -> %x\n",
808 desc->async_tx.cookie, sh_chan->id,
809 desc->hw.tcr, desc->hw.sar, desc->hw.dar);
810 /* Get the ld start address from ld_queue */
811 dmae_set_reg(sh_chan, &desc->hw);
812 dmae_start(sh_chan);
813 break;
814 }
815
816sh_chan_xfer_ld_queue_end:
817 spin_unlock_bh(&sh_chan->desc_lock);
818}
819
820static void sh_dmae_memcpy_issue_pending(struct dma_chan *chan)
821{
822 struct sh_dmae_chan *sh_chan = to_sh_chan(chan);
823 sh_chan_xfer_ld_queue(sh_chan);
824}
825
826static enum dma_status sh_dmae_tx_status(struct dma_chan *chan,
827 dma_cookie_t cookie,
828 struct dma_tx_state *txstate)
829{
830 struct sh_dmae_chan *sh_chan = to_sh_chan(chan);
831 dma_cookie_t last_used;
832 dma_cookie_t last_complete;
833 enum dma_status status;
834
835 sh_dmae_chan_ld_cleanup(sh_chan, false);
836
837 /* First read completed cookie to avoid a skew */
838 last_complete = sh_chan->completed_cookie;
839 rmb();
840 last_used = chan->cookie;
841 BUG_ON(last_complete < 0);
842 dma_set_tx_state(txstate, last_complete, last_used, 0);
843
844 spin_lock_bh(&sh_chan->desc_lock);
845
846 status = dma_async_is_complete(cookie, last_complete, last_used);
847
848 /*
849 * If we don't find cookie on the queue, it has been aborted and we have
850 * to report error
851 */
852 if (status != DMA_SUCCESS) {
853 struct sh_desc *desc;
854 status = DMA_ERROR;
855 list_for_each_entry(desc, &sh_chan->ld_queue, node)
856 if (desc->cookie == cookie) {
857 status = DMA_IN_PROGRESS;
858 break;
859 }
860 }
861
862 spin_unlock_bh(&sh_chan->desc_lock);
863
864 return status;
865}
866
867static irqreturn_t sh_dmae_interrupt(int irq, void *data)
868{
869 irqreturn_t ret = IRQ_NONE;
870 struct sh_dmae_chan *sh_chan = data;
871 u32 chcr;
872
873 spin_lock(&sh_chan->desc_lock);
874
875 chcr = chcr_read(sh_chan);
876
877 if (chcr & CHCR_TE) {
878 /* DMA stop */
879 dmae_halt(sh_chan);
880
881 ret = IRQ_HANDLED;
882 tasklet_schedule(&sh_chan->tasklet);
883 }
884
885 spin_unlock(&sh_chan->desc_lock);
886
887 return ret;
888}
889
890/* Called from error IRQ or NMI */
891static bool sh_dmae_reset(struct sh_dmae_device *shdev)
892{
893 unsigned int handled = 0;
894 int i;
895
896 /* halt the dma controller */
897 sh_dmae_ctl_stop(shdev);
898
899 /* We cannot detect, which channel caused the error, have to reset all */
900 for (i = 0; i < SH_DMAC_MAX_CHANNELS; i++) {
901 struct sh_dmae_chan *sh_chan = shdev->chan[i];
902 struct sh_desc *desc;
903 LIST_HEAD(dl);
904
905 if (!sh_chan)
906 continue;
907
908 spin_lock(&sh_chan->desc_lock);
909
910 /* Stop the channel */
911 dmae_halt(sh_chan);
912
913 list_splice_init(&sh_chan->ld_queue, &dl);
914
915 spin_unlock(&sh_chan->desc_lock);
916
917 /* Complete all */
918 list_for_each_entry(desc, &dl, node) {
919 struct dma_async_tx_descriptor *tx = &desc->async_tx;
920 desc->mark = DESC_IDLE;
921 if (tx->callback)
922 tx->callback(tx->callback_param);
923 }
924
925 spin_lock(&sh_chan->desc_lock);
926 list_splice(&dl, &sh_chan->ld_free);
927 spin_unlock(&sh_chan->desc_lock);
928
929 handled++;
930 }
931
932 sh_dmae_rst(shdev);
933
934 return !!handled;
935}
936
937static irqreturn_t sh_dmae_err(int irq, void *data)
938{
939 struct sh_dmae_device *shdev = data;
940
941 if (!(dmaor_read(shdev) & DMAOR_AE))
942 return IRQ_NONE;
943
944 sh_dmae_reset(data);
945 return IRQ_HANDLED;
946}
947
948static void dmae_do_tasklet(unsigned long data)
949{
950 struct sh_dmae_chan *sh_chan = (struct sh_dmae_chan *)data;
951 struct sh_desc *desc;
952 u32 sar_buf = sh_dmae_readl(sh_chan, SAR);
953 u32 dar_buf = sh_dmae_readl(sh_chan, DAR);
954
955 spin_lock(&sh_chan->desc_lock);
956 list_for_each_entry(desc, &sh_chan->ld_queue, node) {
957 if (desc->mark == DESC_SUBMITTED &&
958 ((desc->direction == DMA_FROM_DEVICE &&
959 (desc->hw.dar + desc->hw.tcr) == dar_buf) ||
960 (desc->hw.sar + desc->hw.tcr) == sar_buf)) {
961 dev_dbg(sh_chan->dev, "done #%d@%p dst %u\n",
962 desc->async_tx.cookie, &desc->async_tx,
963 desc->hw.dar);
964 desc->mark = DESC_COMPLETED;
965 break;
966 }
967 }
968 spin_unlock(&sh_chan->desc_lock);
969
970 /* Next desc */
971 sh_chan_xfer_ld_queue(sh_chan);
972 sh_dmae_chan_ld_cleanup(sh_chan, false);
973}
974
975static bool sh_dmae_nmi_notify(struct sh_dmae_device *shdev)
976{
977 /* Fast path out if NMIF is not asserted for this controller */
978 if ((dmaor_read(shdev) & DMAOR_NMIF) == 0)
979 return false;
980
981 return sh_dmae_reset(shdev);
982}
983
984static int sh_dmae_nmi_handler(struct notifier_block *self,
985 unsigned long cmd, void *data)
986{
987 struct sh_dmae_device *shdev;
988 int ret = NOTIFY_DONE;
989 bool triggered;
990
991 /*
992 * Only concern ourselves with NMI events.
993 *
994 * Normally we would check the die chain value, but as this needs
995 * to be architecture independent, check for NMI context instead.
996 */
997 if (!in_nmi())
998 return NOTIFY_DONE;
999
1000 rcu_read_lock();
1001 list_for_each_entry_rcu(shdev, &sh_dmae_devices, node) {
1002 /*
1003 * Only stop if one of the controllers has NMIF asserted,
1004 * we do not want to interfere with regular address error
1005 * handling or NMI events that don't concern the DMACs.
1006 */
1007 triggered = sh_dmae_nmi_notify(shdev);
1008 if (triggered == true)
1009 ret = NOTIFY_OK;
1010 }
1011 rcu_read_unlock();
1012
1013 return ret;
1014}
1015
1016static struct notifier_block sh_dmae_nmi_notifier __read_mostly = {
1017 .notifier_call = sh_dmae_nmi_handler,
1018
1019 /* Run before NMI debug handler and KGDB */
1020 .priority = 1,
1021};
1022
1023static int __devinit sh_dmae_chan_probe(struct sh_dmae_device *shdev, int id,
1024 int irq, unsigned long flags)
1025{
1026 int err;
1027 const struct sh_dmae_channel *chan_pdata = &shdev->pdata->channel[id];
1028 struct platform_device *pdev = to_platform_device(shdev->common.dev);
1029 struct sh_dmae_chan *new_sh_chan;
1030
1031 /* alloc channel */
1032 new_sh_chan = kzalloc(sizeof(struct sh_dmae_chan), GFP_KERNEL);
1033 if (!new_sh_chan) {
1034 dev_err(shdev->common.dev,
1035 "No free memory for allocating dma channels!\n");
1036 return -ENOMEM;
1037 }
1038
1039 /* copy struct dma_device */
1040 new_sh_chan->common.device = &shdev->common;
1041
1042 new_sh_chan->dev = shdev->common.dev;
1043 new_sh_chan->id = id;
1044 new_sh_chan->irq = irq;
1045 new_sh_chan->base = shdev->chan_reg + chan_pdata->offset / sizeof(u32);
1046
1047 /* Init DMA tasklet */
1048 tasklet_init(&new_sh_chan->tasklet, dmae_do_tasklet,
1049 (unsigned long)new_sh_chan);
1050
1051 spin_lock_init(&new_sh_chan->desc_lock);
1052
1053 /* Init descripter manage list */
1054 INIT_LIST_HEAD(&new_sh_chan->ld_queue);
1055 INIT_LIST_HEAD(&new_sh_chan->ld_free);
1056
1057 /* Add the channel to DMA device channel list */
1058 list_add_tail(&new_sh_chan->common.device_node,
1059 &shdev->common.channels);
1060 shdev->common.chancnt++;
1061
1062 if (pdev->id >= 0)
1063 snprintf(new_sh_chan->dev_id, sizeof(new_sh_chan->dev_id),
1064 "sh-dmae%d.%d", pdev->id, new_sh_chan->id);
1065 else
1066 snprintf(new_sh_chan->dev_id, sizeof(new_sh_chan->dev_id),
1067 "sh-dma%d", new_sh_chan->id);
1068
1069 /* set up channel irq */
1070 err = request_irq(irq, &sh_dmae_interrupt, flags,
1071 new_sh_chan->dev_id, new_sh_chan);
1072 if (err) {
1073 dev_err(shdev->common.dev, "DMA channel %d request_irq error "
1074 "with return %d\n", id, err);
1075 goto err_no_irq;
1076 }
1077
1078 shdev->chan[id] = new_sh_chan;
1079 return 0;
1080
1081err_no_irq:
1082 /* remove from dmaengine device node */
1083 list_del(&new_sh_chan->common.device_node);
1084 kfree(new_sh_chan);
1085 return err;
1086}
1087
1088static void sh_dmae_chan_remove(struct sh_dmae_device *shdev)
1089{
1090 int i;
1091
1092 for (i = shdev->common.chancnt - 1 ; i >= 0 ; i--) {
1093 if (shdev->chan[i]) {
1094 struct sh_dmae_chan *sh_chan = shdev->chan[i];
1095
1096 free_irq(sh_chan->irq, sh_chan);
1097
1098 list_del(&sh_chan->common.device_node);
1099 kfree(sh_chan);
1100 shdev->chan[i] = NULL;
1101 }
1102 }
1103 shdev->common.chancnt = 0;
1104}
1105
1106static int __init sh_dmae_probe(struct platform_device *pdev)
1107{
1108 struct sh_dmae_pdata *pdata = pdev->dev.platform_data;
1109 unsigned long irqflags = IRQF_DISABLED,
1110 chan_flag[SH_DMAC_MAX_CHANNELS] = {};
1111 int errirq, chan_irq[SH_DMAC_MAX_CHANNELS];
1112 int err, i, irq_cnt = 0, irqres = 0, irq_cap = 0;
1113 struct sh_dmae_device *shdev;
1114 struct resource *chan, *dmars, *errirq_res, *chanirq_res;
1115
1116 /* get platform data */
1117 if (!pdata || !pdata->channel_num)
1118 return -ENODEV;
1119
1120 chan = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1121 /* DMARS area is optional */
1122 dmars = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1123 /*
1124 * IRQ resources:
1125 * 1. there always must be at least one IRQ IO-resource. On SH4 it is
1126 * the error IRQ, in which case it is the only IRQ in this resource:
1127 * start == end. If it is the only IRQ resource, all channels also
1128 * use the same IRQ.
1129 * 2. DMA channel IRQ resources can be specified one per resource or in
1130 * ranges (start != end)
1131 * 3. iff all events (channels and, optionally, error) on this
1132 * controller use the same IRQ, only one IRQ resource can be
1133 * specified, otherwise there must be one IRQ per channel, even if
1134 * some of them are equal
1135 * 4. if all IRQs on this controller are equal or if some specific IRQs
1136 * specify IORESOURCE_IRQ_SHAREABLE in their resources, they will be
1137 * requested with the IRQF_SHARED flag
1138 */
1139 errirq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
1140 if (!chan || !errirq_res)
1141 return -ENODEV;
1142
1143 if (!request_mem_region(chan->start, resource_size(chan), pdev->name)) {
1144 dev_err(&pdev->dev, "DMAC register region already claimed\n");
1145 return -EBUSY;
1146 }
1147
1148 if (dmars && !request_mem_region(dmars->start, resource_size(dmars), pdev->name)) {
1149 dev_err(&pdev->dev, "DMAC DMARS region already claimed\n");
1150 err = -EBUSY;
1151 goto ermrdmars;
1152 }
1153
1154 err = -ENOMEM;
1155 shdev = kzalloc(sizeof(struct sh_dmae_device), GFP_KERNEL);
1156 if (!shdev) {
1157 dev_err(&pdev->dev, "Not enough memory\n");
1158 goto ealloc;
1159 }
1160
1161 shdev->chan_reg = ioremap(chan->start, resource_size(chan));
1162 if (!shdev->chan_reg)
1163 goto emapchan;
1164 if (dmars) {
1165 shdev->dmars = ioremap(dmars->start, resource_size(dmars));
1166 if (!shdev->dmars)
1167 goto emapdmars;
1168 }
1169
1170 /* platform data */
1171 shdev->pdata = pdata;
1172
1173 if (pdata->chcr_offset)
1174 shdev->chcr_offset = pdata->chcr_offset;
1175 else
1176 shdev->chcr_offset = CHCR;
1177
1178 if (pdata->chcr_ie_bit)
1179 shdev->chcr_ie_bit = pdata->chcr_ie_bit;
1180 else
1181 shdev->chcr_ie_bit = CHCR_IE;
1182
1183 platform_set_drvdata(pdev, shdev);
1184
1185 pm_runtime_enable(&pdev->dev);
1186 pm_runtime_get_sync(&pdev->dev);
1187
1188 spin_lock_irq(&sh_dmae_lock);
1189 list_add_tail_rcu(&shdev->node, &sh_dmae_devices);
1190 spin_unlock_irq(&sh_dmae_lock);
1191
1192 /* reset dma controller - only needed as a test */
1193 err = sh_dmae_rst(shdev);
1194 if (err)
1195 goto rst_err;
1196
1197 INIT_LIST_HEAD(&shdev->common.channels);
1198
1199 dma_cap_set(DMA_MEMCPY, shdev->common.cap_mask);
1200 if (pdata->slave && pdata->slave_num)
1201 dma_cap_set(DMA_SLAVE, shdev->common.cap_mask);
1202
1203 shdev->common.device_alloc_chan_resources
1204 = sh_dmae_alloc_chan_resources;
1205 shdev->common.device_free_chan_resources = sh_dmae_free_chan_resources;
1206 shdev->common.device_prep_dma_memcpy = sh_dmae_prep_memcpy;
1207 shdev->common.device_tx_status = sh_dmae_tx_status;
1208 shdev->common.device_issue_pending = sh_dmae_memcpy_issue_pending;
1209
1210 /* Compulsory for DMA_SLAVE fields */
1211 shdev->common.device_prep_slave_sg = sh_dmae_prep_slave_sg;
1212 shdev->common.device_control = sh_dmae_control;
1213
1214 shdev->common.dev = &pdev->dev;
1215 /* Default transfer size of 32 bytes requires 32-byte alignment */
1216 shdev->common.copy_align = LOG2_DEFAULT_XFER_SIZE;
1217
1218#if defined(CONFIG_CPU_SH4) || defined(CONFIG_ARCH_SHMOBILE)
1219 chanirq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 1);
1220
1221 if (!chanirq_res)
1222 chanirq_res = errirq_res;
1223 else
1224 irqres++;
1225
1226 if (chanirq_res == errirq_res ||
1227 (errirq_res->flags & IORESOURCE_BITS) == IORESOURCE_IRQ_SHAREABLE)
1228 irqflags = IRQF_SHARED;
1229
1230 errirq = errirq_res->start;
1231
1232 err = request_irq(errirq, sh_dmae_err, irqflags,
1233 "DMAC Address Error", shdev);
1234 if (err) {
1235 dev_err(&pdev->dev,
1236 "DMA failed requesting irq #%d, error %d\n",
1237 errirq, err);
1238 goto eirq_err;
1239 }
1240
1241#else
1242 chanirq_res = errirq_res;
1243#endif /* CONFIG_CPU_SH4 || CONFIG_ARCH_SHMOBILE */
1244
1245 if (chanirq_res->start == chanirq_res->end &&
1246 !platform_get_resource(pdev, IORESOURCE_IRQ, 1)) {
1247 /* Special case - all multiplexed */
1248 for (; irq_cnt < pdata->channel_num; irq_cnt++) {
1249 if (irq_cnt < SH_DMAC_MAX_CHANNELS) {
1250 chan_irq[irq_cnt] = chanirq_res->start;
1251 chan_flag[irq_cnt] = IRQF_SHARED;
1252 } else {
1253 irq_cap = 1;
1254 break;
1255 }
1256 }
1257 } else {
1258 do {
1259 for (i = chanirq_res->start; i <= chanirq_res->end; i++) {
1260 if (irq_cnt >= SH_DMAC_MAX_CHANNELS) {
1261 irq_cap = 1;
1262 break;
1263 }
1264
1265 if ((errirq_res->flags & IORESOURCE_BITS) ==
1266 IORESOURCE_IRQ_SHAREABLE)
1267 chan_flag[irq_cnt] = IRQF_SHARED;
1268 else
1269 chan_flag[irq_cnt] = IRQF_DISABLED;
1270 dev_dbg(&pdev->dev,
1271 "Found IRQ %d for channel %d\n",
1272 i, irq_cnt);
1273 chan_irq[irq_cnt++] = i;
1274 }
1275
1276 if (irq_cnt >= SH_DMAC_MAX_CHANNELS)
1277 break;
1278
1279 chanirq_res = platform_get_resource(pdev,
1280 IORESOURCE_IRQ, ++irqres);
1281 } while (irq_cnt < pdata->channel_num && chanirq_res);
1282 }
1283
1284 /* Create DMA Channel */
1285 for (i = 0; i < irq_cnt; i++) {
1286 err = sh_dmae_chan_probe(shdev, i, chan_irq[i], chan_flag[i]);
1287 if (err)
1288 goto chan_probe_err;
1289 }
1290
1291 if (irq_cap)
1292 dev_notice(&pdev->dev, "Attempting to register %d DMA "
1293 "channels when a maximum of %d are supported.\n",
1294 pdata->channel_num, SH_DMAC_MAX_CHANNELS);
1295
1296 pm_runtime_put(&pdev->dev);
1297
1298 dma_async_device_register(&shdev->common);
1299
1300 return err;
1301
1302chan_probe_err:
1303 sh_dmae_chan_remove(shdev);
1304
1305#if defined(CONFIG_CPU_SH4) || defined(CONFIG_ARCH_SHMOBILE)
1306 free_irq(errirq, shdev);
1307eirq_err:
1308#endif
1309rst_err:
1310 spin_lock_irq(&sh_dmae_lock);
1311 list_del_rcu(&shdev->node);
1312 spin_unlock_irq(&sh_dmae_lock);
1313
1314 pm_runtime_put(&pdev->dev);
1315 pm_runtime_disable(&pdev->dev);
1316
1317 if (dmars)
1318 iounmap(shdev->dmars);
1319
1320 platform_set_drvdata(pdev, NULL);
1321emapdmars:
1322 iounmap(shdev->chan_reg);
1323 synchronize_rcu();
1324emapchan:
1325 kfree(shdev);
1326ealloc:
1327 if (dmars)
1328 release_mem_region(dmars->start, resource_size(dmars));
1329ermrdmars:
1330 release_mem_region(chan->start, resource_size(chan));
1331
1332 return err;
1333}
1334
1335static int __exit sh_dmae_remove(struct platform_device *pdev)
1336{
1337 struct sh_dmae_device *shdev = platform_get_drvdata(pdev);
1338 struct resource *res;
1339 int errirq = platform_get_irq(pdev, 0);
1340
1341 dma_async_device_unregister(&shdev->common);
1342
1343 if (errirq > 0)
1344 free_irq(errirq, shdev);
1345
1346 spin_lock_irq(&sh_dmae_lock);
1347 list_del_rcu(&shdev->node);
1348 spin_unlock_irq(&sh_dmae_lock);
1349
1350 /* channel data remove */
1351 sh_dmae_chan_remove(shdev);
1352
1353 pm_runtime_disable(&pdev->dev);
1354
1355 if (shdev->dmars)
1356 iounmap(shdev->dmars);
1357 iounmap(shdev->chan_reg);
1358
1359 platform_set_drvdata(pdev, NULL);
1360
1361 synchronize_rcu();
1362 kfree(shdev);
1363
1364 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1365 if (res)
1366 release_mem_region(res->start, resource_size(res));
1367 res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1368 if (res)
1369 release_mem_region(res->start, resource_size(res));
1370
1371 return 0;
1372}
1373
1374static void sh_dmae_shutdown(struct platform_device *pdev)
1375{
1376 struct sh_dmae_device *shdev = platform_get_drvdata(pdev);
1377 sh_dmae_ctl_stop(shdev);
1378}
1379
1380static int sh_dmae_runtime_suspend(struct device *dev)
1381{
1382 return 0;
1383}
1384
1385static int sh_dmae_runtime_resume(struct device *dev)
1386{
1387 struct sh_dmae_device *shdev = dev_get_drvdata(dev);
1388
1389 return sh_dmae_rst(shdev);
1390}
1391
1392#ifdef CONFIG_PM
1393static int sh_dmae_suspend(struct device *dev)
1394{
1395 struct sh_dmae_device *shdev = dev_get_drvdata(dev);
1396 int i;
1397
1398 for (i = 0; i < shdev->pdata->channel_num; i++) {
1399 struct sh_dmae_chan *sh_chan = shdev->chan[i];
1400 if (sh_chan->descs_allocated)
1401 sh_chan->pm_error = pm_runtime_put_sync(dev);
1402 }
1403
1404 return 0;
1405}
1406
1407static int sh_dmae_resume(struct device *dev)
1408{
1409 struct sh_dmae_device *shdev = dev_get_drvdata(dev);
1410 int i;
1411
1412 for (i = 0; i < shdev->pdata->channel_num; i++) {
1413 struct sh_dmae_chan *sh_chan = shdev->chan[i];
1414 struct sh_dmae_slave *param = sh_chan->common.private;
1415
1416 if (!sh_chan->descs_allocated)
1417 continue;
1418
1419 if (!sh_chan->pm_error)
1420 pm_runtime_get_sync(dev);
1421
1422 if (param) {
1423 const struct sh_dmae_slave_config *cfg = param->config;
1424 dmae_set_dmars(sh_chan, cfg->mid_rid);
1425 dmae_set_chcr(sh_chan, cfg->chcr);
1426 } else {
1427 dmae_init(sh_chan);
1428 }
1429 }
1430
1431 return 0;
1432}
1433#else
1434#define sh_dmae_suspend NULL
1435#define sh_dmae_resume NULL
1436#endif
1437
1438const struct dev_pm_ops sh_dmae_pm = {
1439 .suspend = sh_dmae_suspend,
1440 .resume = sh_dmae_resume,
1441 .runtime_suspend = sh_dmae_runtime_suspend,
1442 .runtime_resume = sh_dmae_runtime_resume,
1443};
1444
1445static struct platform_driver sh_dmae_driver = {
1446 .remove = __exit_p(sh_dmae_remove),
1447 .shutdown = sh_dmae_shutdown,
1448 .driver = {
1449 .owner = THIS_MODULE,
1450 .name = "sh-dma-engine",
1451 .pm = &sh_dmae_pm,
1452 },
1453};
1454
1455static int __init sh_dmae_init(void)
1456{
1457 /* Wire up NMI handling */
1458 int err = register_die_notifier(&sh_dmae_nmi_notifier);
1459 if (err)
1460 return err;
1461
1462 return platform_driver_probe(&sh_dmae_driver, sh_dmae_probe);
1463}
1464module_init(sh_dmae_init);
1465
1466static void __exit sh_dmae_exit(void)
1467{
1468 platform_driver_unregister(&sh_dmae_driver);
1469
1470 unregister_die_notifier(&sh_dmae_nmi_notifier);
1471}
1472module_exit(sh_dmae_exit);
1473
1474MODULE_AUTHOR("Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>");
1475MODULE_DESCRIPTION("Renesas SH DMA Engine driver");
1476MODULE_LICENSE("GPL");
1477MODULE_ALIAS("platform:sh-dma-engine");
diff --git a/drivers/dma/shdma.h b/drivers/dma/shdma.h
new file mode 100644
index 00000000000..dc56576f9fd
--- /dev/null
+++ b/drivers/dma/shdma.h
@@ -0,0 +1,60 @@
1/*
2 * Renesas SuperH DMA Engine support
3 *
4 * Copyright (C) 2009 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>
5 * Copyright (C) 2009 Renesas Solutions, Inc. All rights reserved.
6 *
7 * This is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 */
13#ifndef __DMA_SHDMA_H
14#define __DMA_SHDMA_H
15
16#include <linux/dmaengine.h>
17#include <linux/interrupt.h>
18#include <linux/list.h>
19
20#define SH_DMAC_MAX_CHANNELS 20
21#define SH_DMA_SLAVE_NUMBER 256
22#define SH_DMA_TCR_MAX 0x00FFFFFF /* 16MB */
23
24struct device;
25
26struct sh_dmae_chan {
27 dma_cookie_t completed_cookie; /* The maximum cookie completed */
28 spinlock_t desc_lock; /* Descriptor operation lock */
29 struct list_head ld_queue; /* Link descriptors queue */
30 struct list_head ld_free; /* Link descriptors free */
31 struct dma_chan common; /* DMA common channel */
32 struct device *dev; /* Channel device */
33 struct tasklet_struct tasklet; /* Tasklet */
34 int descs_allocated; /* desc count */
35 int xmit_shift; /* log_2(bytes_per_xfer) */
36 int irq;
37 int id; /* Raw id of this channel */
38 u32 __iomem *base;
39 char dev_id[16]; /* unique name per DMAC of channel */
40 int pm_error;
41};
42
43struct sh_dmae_device {
44 struct dma_device common;
45 struct sh_dmae_chan *chan[SH_DMAC_MAX_CHANNELS];
46 struct sh_dmae_pdata *pdata;
47 struct list_head node;
48 u32 __iomem *chan_reg;
49 u16 __iomem *dmars;
50 unsigned int chcr_offset;
51 u32 chcr_ie_bit;
52};
53
54#define to_sh_chan(chan) container_of(chan, struct sh_dmae_chan, common)
55#define to_sh_desc(lh) container_of(lh, struct sh_desc, node)
56#define tx_to_sh_desc(tx) container_of(tx, struct sh_desc, async_tx)
57#define to_sh_dev(chan) container_of(chan->common.device,\
58 struct sh_dmae_device, common)
59
60#endif /* __DMA_SHDMA_H */
generated by cgit v1.2.2 (git 2.25.0) at 2026-01-12 19:54:01 -0500