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Commit | Line | Data |
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dc78baa2 NF |
1 | /* |
2 | * Driver for the Atmel AHB DMA Controller (aka HDMA or DMAC on AT91 systems) | |
3 | * | |
4 | * Copyright (C) 2008 Atmel Corporation | |
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 as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * | |
9102d871 NF |
12 | * This supports the Atmel AHB DMA Controller found in several Atmel SoCs. |
13 | * The only Atmel DMA Controller that is not covered by this driver is the one | |
14 | * found on AT91SAM9263. | |
dc78baa2 NF |
15 | */ |
16 | ||
17 | #include <linux/clk.h> | |
18 | #include <linux/dmaengine.h> | |
19 | #include <linux/dma-mapping.h> | |
20 | #include <linux/dmapool.h> | |
21 | #include <linux/interrupt.h> | |
22 | #include <linux/module.h> | |
23 | #include <linux/platform_device.h> | |
5a0e3ad6 | 24 | #include <linux/slab.h> |
c5115953 NF |
25 | #include <linux/of.h> |
26 | #include <linux/of_device.h> | |
bbe89c8e | 27 | #include <linux/of_dma.h> |
dc78baa2 NF |
28 | |
29 | #include "at_hdmac_regs.h" | |
d2ebfb33 | 30 | #include "dmaengine.h" |
dc78baa2 NF |
31 | |
32 | /* | |
33 | * Glossary | |
34 | * -------- | |
35 | * | |
36 | * at_hdmac : Name of the ATmel AHB DMA Controller | |
37 | * at_dma_ / atdma : ATmel DMA controller entity related | |
38 | * atc_ / atchan : ATmel DMA Channel entity related | |
39 | */ | |
40 | ||
41 | #define ATC_DEFAULT_CFG (ATC_FIFOCFG_HALFFIFO) | |
ae14d4b5 NF |
42 | #define ATC_DEFAULT_CTRLB (ATC_SIF(AT_DMA_MEM_IF) \ |
43 | |ATC_DIF(AT_DMA_MEM_IF)) | |
dc78baa2 NF |
44 | |
45 | /* | |
46 | * Initial number of descriptors to allocate for each channel. This could | |
47 | * be increased during dma usage. | |
48 | */ | |
49 | static unsigned int init_nr_desc_per_channel = 64; | |
50 | module_param(init_nr_desc_per_channel, uint, 0644); | |
51 | MODULE_PARM_DESC(init_nr_desc_per_channel, | |
52 | "initial descriptors per channel (default: 64)"); | |
53 | ||
54 | ||
55 | /* prototypes */ | |
56 | static dma_cookie_t atc_tx_submit(struct dma_async_tx_descriptor *tx); | |
57 | ||
58 | ||
59 | /*----------------------------------------------------------------------*/ | |
60 | ||
61 | static struct at_desc *atc_first_active(struct at_dma_chan *atchan) | |
62 | { | |
63 | return list_first_entry(&atchan->active_list, | |
64 | struct at_desc, desc_node); | |
65 | } | |
66 | ||
67 | static struct at_desc *atc_first_queued(struct at_dma_chan *atchan) | |
68 | { | |
69 | return list_first_entry(&atchan->queue, | |
70 | struct at_desc, desc_node); | |
71 | } | |
72 | ||
73 | /** | |
421f91d2 | 74 | * atc_alloc_descriptor - allocate and return an initialized descriptor |
dc78baa2 NF |
75 | * @chan: the channel to allocate descriptors for |
76 | * @gfp_flags: GFP allocation flags | |
77 | * | |
78 | * Note: The ack-bit is positioned in the descriptor flag at creation time | |
79 | * to make initial allocation more convenient. This bit will be cleared | |
80 | * and control will be given to client at usage time (during | |
81 | * preparation functions). | |
82 | */ | |
83 | static struct at_desc *atc_alloc_descriptor(struct dma_chan *chan, | |
84 | gfp_t gfp_flags) | |
85 | { | |
86 | struct at_desc *desc = NULL; | |
87 | struct at_dma *atdma = to_at_dma(chan->device); | |
88 | dma_addr_t phys; | |
89 | ||
90 | desc = dma_pool_alloc(atdma->dma_desc_pool, gfp_flags, &phys); | |
91 | if (desc) { | |
92 | memset(desc, 0, sizeof(struct at_desc)); | |
285a3c71 | 93 | INIT_LIST_HEAD(&desc->tx_list); |
dc78baa2 NF |
94 | dma_async_tx_descriptor_init(&desc->txd, chan); |
95 | /* txd.flags will be overwritten in prep functions */ | |
96 | desc->txd.flags = DMA_CTRL_ACK; | |
97 | desc->txd.tx_submit = atc_tx_submit; | |
98 | desc->txd.phys = phys; | |
99 | } | |
100 | ||
101 | return desc; | |
102 | } | |
103 | ||
104 | /** | |
af901ca1 | 105 | * atc_desc_get - get an unused descriptor from free_list |
dc78baa2 NF |
106 | * @atchan: channel we want a new descriptor for |
107 | */ | |
108 | static struct at_desc *atc_desc_get(struct at_dma_chan *atchan) | |
109 | { | |
110 | struct at_desc *desc, *_desc; | |
111 | struct at_desc *ret = NULL; | |
d8cb04b0 | 112 | unsigned long flags; |
dc78baa2 NF |
113 | unsigned int i = 0; |
114 | LIST_HEAD(tmp_list); | |
115 | ||
d8cb04b0 | 116 | spin_lock_irqsave(&atchan->lock, flags); |
dc78baa2 NF |
117 | list_for_each_entry_safe(desc, _desc, &atchan->free_list, desc_node) { |
118 | i++; | |
119 | if (async_tx_test_ack(&desc->txd)) { | |
120 | list_del(&desc->desc_node); | |
121 | ret = desc; | |
122 | break; | |
123 | } | |
124 | dev_dbg(chan2dev(&atchan->chan_common), | |
125 | "desc %p not ACKed\n", desc); | |
126 | } | |
d8cb04b0 | 127 | spin_unlock_irqrestore(&atchan->lock, flags); |
dc78baa2 NF |
128 | dev_vdbg(chan2dev(&atchan->chan_common), |
129 | "scanned %u descriptors on freelist\n", i); | |
130 | ||
131 | /* no more descriptor available in initial pool: create one more */ | |
132 | if (!ret) { | |
133 | ret = atc_alloc_descriptor(&atchan->chan_common, GFP_ATOMIC); | |
134 | if (ret) { | |
d8cb04b0 | 135 | spin_lock_irqsave(&atchan->lock, flags); |
dc78baa2 | 136 | atchan->descs_allocated++; |
d8cb04b0 | 137 | spin_unlock_irqrestore(&atchan->lock, flags); |
dc78baa2 NF |
138 | } else { |
139 | dev_err(chan2dev(&atchan->chan_common), | |
140 | "not enough descriptors available\n"); | |
141 | } | |
142 | } | |
143 | ||
144 | return ret; | |
145 | } | |
146 | ||
147 | /** | |
148 | * atc_desc_put - move a descriptor, including any children, to the free list | |
149 | * @atchan: channel we work on | |
150 | * @desc: descriptor, at the head of a chain, to move to free list | |
151 | */ | |
152 | static void atc_desc_put(struct at_dma_chan *atchan, struct at_desc *desc) | |
153 | { | |
154 | if (desc) { | |
155 | struct at_desc *child; | |
d8cb04b0 | 156 | unsigned long flags; |
dc78baa2 | 157 | |
d8cb04b0 | 158 | spin_lock_irqsave(&atchan->lock, flags); |
285a3c71 | 159 | list_for_each_entry(child, &desc->tx_list, desc_node) |
dc78baa2 NF |
160 | dev_vdbg(chan2dev(&atchan->chan_common), |
161 | "moving child desc %p to freelist\n", | |
162 | child); | |
285a3c71 | 163 | list_splice_init(&desc->tx_list, &atchan->free_list); |
dc78baa2 NF |
164 | dev_vdbg(chan2dev(&atchan->chan_common), |
165 | "moving desc %p to freelist\n", desc); | |
166 | list_add(&desc->desc_node, &atchan->free_list); | |
d8cb04b0 | 167 | spin_unlock_irqrestore(&atchan->lock, flags); |
dc78baa2 NF |
168 | } |
169 | } | |
170 | ||
53830cc7 | 171 | /** |
d73111c6 MI |
172 | * atc_desc_chain - build chain adding a descriptor |
173 | * @first: address of first descriptor of the chain | |
174 | * @prev: address of previous descriptor of the chain | |
53830cc7 NF |
175 | * @desc: descriptor to queue |
176 | * | |
177 | * Called from prep_* functions | |
178 | */ | |
179 | static void atc_desc_chain(struct at_desc **first, struct at_desc **prev, | |
180 | struct at_desc *desc) | |
181 | { | |
182 | if (!(*first)) { | |
183 | *first = desc; | |
184 | } else { | |
185 | /* inform the HW lli about chaining */ | |
186 | (*prev)->lli.dscr = desc->txd.phys; | |
187 | /* insert the link descriptor to the LD ring */ | |
188 | list_add_tail(&desc->desc_node, | |
189 | &(*first)->tx_list); | |
190 | } | |
191 | *prev = desc; | |
192 | } | |
193 | ||
dc78baa2 NF |
194 | /** |
195 | * atc_dostart - starts the DMA engine for real | |
196 | * @atchan: the channel we want to start | |
197 | * @first: first descriptor in the list we want to begin with | |
198 | * | |
199 | * Called with atchan->lock held and bh disabled | |
200 | */ | |
201 | static void atc_dostart(struct at_dma_chan *atchan, struct at_desc *first) | |
202 | { | |
203 | struct at_dma *atdma = to_at_dma(atchan->chan_common.device); | |
204 | ||
205 | /* ASSERT: channel is idle */ | |
206 | if (atc_chan_is_enabled(atchan)) { | |
207 | dev_err(chan2dev(&atchan->chan_common), | |
208 | "BUG: Attempted to start non-idle channel\n"); | |
209 | dev_err(chan2dev(&atchan->chan_common), | |
210 | " channel: s0x%x d0x%x ctrl0x%x:0x%x l0x%x\n", | |
211 | channel_readl(atchan, SADDR), | |
212 | channel_readl(atchan, DADDR), | |
213 | channel_readl(atchan, CTRLA), | |
214 | channel_readl(atchan, CTRLB), | |
215 | channel_readl(atchan, DSCR)); | |
216 | ||
217 | /* The tasklet will hopefully advance the queue... */ | |
218 | return; | |
219 | } | |
220 | ||
221 | vdbg_dump_regs(atchan); | |
222 | ||
dc78baa2 NF |
223 | channel_writel(atchan, SADDR, 0); |
224 | channel_writel(atchan, DADDR, 0); | |
225 | channel_writel(atchan, CTRLA, 0); | |
226 | channel_writel(atchan, CTRLB, 0); | |
227 | channel_writel(atchan, DSCR, first->txd.phys); | |
228 | dma_writel(atdma, CHER, atchan->mask); | |
229 | ||
230 | vdbg_dump_regs(atchan); | |
231 | } | |
232 | ||
233 | /** | |
234 | * atc_chain_complete - finish work for one transaction chain | |
235 | * @atchan: channel we work on | |
236 | * @desc: descriptor at the head of the chain we want do complete | |
237 | * | |
238 | * Called with atchan->lock held and bh disabled */ | |
239 | static void | |
240 | atc_chain_complete(struct at_dma_chan *atchan, struct at_desc *desc) | |
241 | { | |
dc78baa2 NF |
242 | struct dma_async_tx_descriptor *txd = &desc->txd; |
243 | ||
244 | dev_vdbg(chan2dev(&atchan->chan_common), | |
245 | "descriptor %u complete\n", txd->cookie); | |
246 | ||
d4116052 VK |
247 | /* mark the descriptor as complete for non cyclic cases only */ |
248 | if (!atc_chan_is_cyclic(atchan)) | |
249 | dma_cookie_complete(txd); | |
dc78baa2 NF |
250 | |
251 | /* move children to free_list */ | |
285a3c71 | 252 | list_splice_init(&desc->tx_list, &atchan->free_list); |
dc78baa2 NF |
253 | /* move myself to free_list */ |
254 | list_move(&desc->desc_node, &atchan->free_list); | |
255 | ||
ebcf9b80 | 256 | /* unmap dma addresses (not on slave channels) */ |
657a77fa AN |
257 | if (!atchan->chan_common.private) { |
258 | struct device *parent = chan2parent(&atchan->chan_common); | |
259 | if (!(txd->flags & DMA_COMPL_SKIP_DEST_UNMAP)) { | |
260 | if (txd->flags & DMA_COMPL_DEST_UNMAP_SINGLE) | |
261 | dma_unmap_single(parent, | |
262 | desc->lli.daddr, | |
263 | desc->len, DMA_FROM_DEVICE); | |
264 | else | |
265 | dma_unmap_page(parent, | |
266 | desc->lli.daddr, | |
267 | desc->len, DMA_FROM_DEVICE); | |
268 | } | |
269 | if (!(txd->flags & DMA_COMPL_SKIP_SRC_UNMAP)) { | |
270 | if (txd->flags & DMA_COMPL_SRC_UNMAP_SINGLE) | |
271 | dma_unmap_single(parent, | |
272 | desc->lli.saddr, | |
273 | desc->len, DMA_TO_DEVICE); | |
274 | else | |
275 | dma_unmap_page(parent, | |
276 | desc->lli.saddr, | |
277 | desc->len, DMA_TO_DEVICE); | |
278 | } | |
dc78baa2 NF |
279 | } |
280 | ||
53830cc7 NF |
281 | /* for cyclic transfers, |
282 | * no need to replay callback function while stopping */ | |
3c477482 | 283 | if (!atc_chan_is_cyclic(atchan)) { |
53830cc7 NF |
284 | dma_async_tx_callback callback = txd->callback; |
285 | void *param = txd->callback_param; | |
286 | ||
287 | /* | |
288 | * The API requires that no submissions are done from a | |
289 | * callback, so we don't need to drop the lock here | |
290 | */ | |
291 | if (callback) | |
292 | callback(param); | |
293 | } | |
dc78baa2 NF |
294 | |
295 | dma_run_dependencies(txd); | |
296 | } | |
297 | ||
298 | /** | |
299 | * atc_complete_all - finish work for all transactions | |
300 | * @atchan: channel to complete transactions for | |
301 | * | |
302 | * Eventually submit queued descriptors if any | |
303 | * | |
304 | * Assume channel is idle while calling this function | |
305 | * Called with atchan->lock held and bh disabled | |
306 | */ | |
307 | static void atc_complete_all(struct at_dma_chan *atchan) | |
308 | { | |
309 | struct at_desc *desc, *_desc; | |
310 | LIST_HEAD(list); | |
311 | ||
312 | dev_vdbg(chan2dev(&atchan->chan_common), "complete all\n"); | |
313 | ||
dc78baa2 NF |
314 | /* |
315 | * Submit queued descriptors ASAP, i.e. before we go through | |
316 | * the completed ones. | |
317 | */ | |
318 | if (!list_empty(&atchan->queue)) | |
319 | atc_dostart(atchan, atc_first_queued(atchan)); | |
320 | /* empty active_list now it is completed */ | |
321 | list_splice_init(&atchan->active_list, &list); | |
322 | /* empty queue list by moving descriptors (if any) to active_list */ | |
323 | list_splice_init(&atchan->queue, &atchan->active_list); | |
324 | ||
325 | list_for_each_entry_safe(desc, _desc, &list, desc_node) | |
326 | atc_chain_complete(atchan, desc); | |
327 | } | |
328 | ||
329 | /** | |
330 | * atc_cleanup_descriptors - cleanup up finished descriptors in active_list | |
331 | * @atchan: channel to be cleaned up | |
332 | * | |
333 | * Called with atchan->lock held and bh disabled | |
334 | */ | |
335 | static void atc_cleanup_descriptors(struct at_dma_chan *atchan) | |
336 | { | |
337 | struct at_desc *desc, *_desc; | |
338 | struct at_desc *child; | |
339 | ||
340 | dev_vdbg(chan2dev(&atchan->chan_common), "cleanup descriptors\n"); | |
341 | ||
342 | list_for_each_entry_safe(desc, _desc, &atchan->active_list, desc_node) { | |
343 | if (!(desc->lli.ctrla & ATC_DONE)) | |
344 | /* This one is currently in progress */ | |
345 | return; | |
346 | ||
285a3c71 | 347 | list_for_each_entry(child, &desc->tx_list, desc_node) |
dc78baa2 NF |
348 | if (!(child->lli.ctrla & ATC_DONE)) |
349 | /* Currently in progress */ | |
350 | return; | |
351 | ||
352 | /* | |
353 | * No descriptors so far seem to be in progress, i.e. | |
354 | * this chain must be done. | |
355 | */ | |
356 | atc_chain_complete(atchan, desc); | |
357 | } | |
358 | } | |
359 | ||
360 | /** | |
361 | * atc_advance_work - at the end of a transaction, move forward | |
362 | * @atchan: channel where the transaction ended | |
363 | * | |
364 | * Called with atchan->lock held and bh disabled | |
365 | */ | |
366 | static void atc_advance_work(struct at_dma_chan *atchan) | |
367 | { | |
368 | dev_vdbg(chan2dev(&atchan->chan_common), "advance_work\n"); | |
369 | ||
d202f051 LD |
370 | if (atc_chan_is_enabled(atchan)) |
371 | return; | |
372 | ||
dc78baa2 NF |
373 | if (list_empty(&atchan->active_list) || |
374 | list_is_singular(&atchan->active_list)) { | |
375 | atc_complete_all(atchan); | |
376 | } else { | |
377 | atc_chain_complete(atchan, atc_first_active(atchan)); | |
378 | /* advance work */ | |
379 | atc_dostart(atchan, atc_first_active(atchan)); | |
380 | } | |
381 | } | |
382 | ||
383 | ||
384 | /** | |
385 | * atc_handle_error - handle errors reported by DMA controller | |
386 | * @atchan: channel where error occurs | |
387 | * | |
388 | * Called with atchan->lock held and bh disabled | |
389 | */ | |
390 | static void atc_handle_error(struct at_dma_chan *atchan) | |
391 | { | |
392 | struct at_desc *bad_desc; | |
393 | struct at_desc *child; | |
394 | ||
395 | /* | |
396 | * The descriptor currently at the head of the active list is | |
397 | * broked. Since we don't have any way to report errors, we'll | |
398 | * just have to scream loudly and try to carry on. | |
399 | */ | |
400 | bad_desc = atc_first_active(atchan); | |
401 | list_del_init(&bad_desc->desc_node); | |
402 | ||
403 | /* As we are stopped, take advantage to push queued descriptors | |
404 | * in active_list */ | |
405 | list_splice_init(&atchan->queue, atchan->active_list.prev); | |
406 | ||
407 | /* Try to restart the controller */ | |
408 | if (!list_empty(&atchan->active_list)) | |
409 | atc_dostart(atchan, atc_first_active(atchan)); | |
410 | ||
411 | /* | |
412 | * KERN_CRITICAL may seem harsh, but since this only happens | |
413 | * when someone submits a bad physical address in a | |
414 | * descriptor, we should consider ourselves lucky that the | |
415 | * controller flagged an error instead of scribbling over | |
416 | * random memory locations. | |
417 | */ | |
418 | dev_crit(chan2dev(&atchan->chan_common), | |
419 | "Bad descriptor submitted for DMA!\n"); | |
420 | dev_crit(chan2dev(&atchan->chan_common), | |
421 | " cookie: %d\n", bad_desc->txd.cookie); | |
422 | atc_dump_lli(atchan, &bad_desc->lli); | |
285a3c71 | 423 | list_for_each_entry(child, &bad_desc->tx_list, desc_node) |
dc78baa2 NF |
424 | atc_dump_lli(atchan, &child->lli); |
425 | ||
426 | /* Pretend the descriptor completed successfully */ | |
427 | atc_chain_complete(atchan, bad_desc); | |
428 | } | |
429 | ||
53830cc7 NF |
430 | /** |
431 | * atc_handle_cyclic - at the end of a period, run callback function | |
432 | * @atchan: channel used for cyclic operations | |
433 | * | |
434 | * Called with atchan->lock held and bh disabled | |
435 | */ | |
436 | static void atc_handle_cyclic(struct at_dma_chan *atchan) | |
437 | { | |
438 | struct at_desc *first = atc_first_active(atchan); | |
439 | struct dma_async_tx_descriptor *txd = &first->txd; | |
440 | dma_async_tx_callback callback = txd->callback; | |
441 | void *param = txd->callback_param; | |
442 | ||
443 | dev_vdbg(chan2dev(&atchan->chan_common), | |
444 | "new cyclic period llp 0x%08x\n", | |
445 | channel_readl(atchan, DSCR)); | |
446 | ||
447 | if (callback) | |
448 | callback(param); | |
449 | } | |
dc78baa2 NF |
450 | |
451 | /*-- IRQ & Tasklet ---------------------------------------------------*/ | |
452 | ||
453 | static void atc_tasklet(unsigned long data) | |
454 | { | |
455 | struct at_dma_chan *atchan = (struct at_dma_chan *)data; | |
d8cb04b0 | 456 | unsigned long flags; |
dc78baa2 | 457 | |
d8cb04b0 | 458 | spin_lock_irqsave(&atchan->lock, flags); |
53830cc7 | 459 | if (test_and_clear_bit(ATC_IS_ERROR, &atchan->status)) |
dc78baa2 | 460 | atc_handle_error(atchan); |
3c477482 | 461 | else if (atc_chan_is_cyclic(atchan)) |
53830cc7 | 462 | atc_handle_cyclic(atchan); |
dc78baa2 NF |
463 | else |
464 | atc_advance_work(atchan); | |
465 | ||
d8cb04b0 | 466 | spin_unlock_irqrestore(&atchan->lock, flags); |
dc78baa2 NF |
467 | } |
468 | ||
469 | static irqreturn_t at_dma_interrupt(int irq, void *dev_id) | |
470 | { | |
471 | struct at_dma *atdma = (struct at_dma *)dev_id; | |
472 | struct at_dma_chan *atchan; | |
473 | int i; | |
474 | u32 status, pending, imr; | |
475 | int ret = IRQ_NONE; | |
476 | ||
477 | do { | |
478 | imr = dma_readl(atdma, EBCIMR); | |
479 | status = dma_readl(atdma, EBCISR); | |
480 | pending = status & imr; | |
481 | ||
482 | if (!pending) | |
483 | break; | |
484 | ||
485 | dev_vdbg(atdma->dma_common.dev, | |
486 | "interrupt: status = 0x%08x, 0x%08x, 0x%08x\n", | |
487 | status, imr, pending); | |
488 | ||
489 | for (i = 0; i < atdma->dma_common.chancnt; i++) { | |
490 | atchan = &atdma->chan[i]; | |
9b3aa589 | 491 | if (pending & (AT_DMA_BTC(i) | AT_DMA_ERR(i))) { |
dc78baa2 NF |
492 | if (pending & AT_DMA_ERR(i)) { |
493 | /* Disable channel on AHB error */ | |
23b5e3ad NF |
494 | dma_writel(atdma, CHDR, |
495 | AT_DMA_RES(i) | atchan->mask); | |
dc78baa2 | 496 | /* Give information to tasklet */ |
53830cc7 | 497 | set_bit(ATC_IS_ERROR, &atchan->status); |
dc78baa2 NF |
498 | } |
499 | tasklet_schedule(&atchan->tasklet); | |
500 | ret = IRQ_HANDLED; | |
501 | } | |
502 | } | |
503 | ||
504 | } while (pending); | |
505 | ||
506 | return ret; | |
507 | } | |
508 | ||
509 | ||
510 | /*-- DMA Engine API --------------------------------------------------*/ | |
511 | ||
512 | /** | |
513 | * atc_tx_submit - set the prepared descriptor(s) to be executed by the engine | |
514 | * @desc: descriptor at the head of the transaction chain | |
515 | * | |
516 | * Queue chain if DMA engine is working already | |
517 | * | |
518 | * Cookie increment and adding to active_list or queue must be atomic | |
519 | */ | |
520 | static dma_cookie_t atc_tx_submit(struct dma_async_tx_descriptor *tx) | |
521 | { | |
522 | struct at_desc *desc = txd_to_at_desc(tx); | |
523 | struct at_dma_chan *atchan = to_at_dma_chan(tx->chan); | |
524 | dma_cookie_t cookie; | |
d8cb04b0 | 525 | unsigned long flags; |
dc78baa2 | 526 | |
d8cb04b0 | 527 | spin_lock_irqsave(&atchan->lock, flags); |
884485e1 | 528 | cookie = dma_cookie_assign(tx); |
dc78baa2 NF |
529 | |
530 | if (list_empty(&atchan->active_list)) { | |
531 | dev_vdbg(chan2dev(tx->chan), "tx_submit: started %u\n", | |
532 | desc->txd.cookie); | |
533 | atc_dostart(atchan, desc); | |
534 | list_add_tail(&desc->desc_node, &atchan->active_list); | |
535 | } else { | |
536 | dev_vdbg(chan2dev(tx->chan), "tx_submit: queued %u\n", | |
537 | desc->txd.cookie); | |
538 | list_add_tail(&desc->desc_node, &atchan->queue); | |
539 | } | |
540 | ||
d8cb04b0 | 541 | spin_unlock_irqrestore(&atchan->lock, flags); |
dc78baa2 NF |
542 | |
543 | return cookie; | |
544 | } | |
545 | ||
546 | /** | |
547 | * atc_prep_dma_memcpy - prepare a memcpy operation | |
548 | * @chan: the channel to prepare operation on | |
549 | * @dest: operation virtual destination address | |
550 | * @src: operation virtual source address | |
551 | * @len: operation length | |
552 | * @flags: tx descriptor status flags | |
553 | */ | |
554 | static struct dma_async_tx_descriptor * | |
555 | atc_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src, | |
556 | size_t len, unsigned long flags) | |
557 | { | |
558 | struct at_dma_chan *atchan = to_at_dma_chan(chan); | |
559 | struct at_desc *desc = NULL; | |
560 | struct at_desc *first = NULL; | |
561 | struct at_desc *prev = NULL; | |
562 | size_t xfer_count; | |
563 | size_t offset; | |
564 | unsigned int src_width; | |
565 | unsigned int dst_width; | |
566 | u32 ctrla; | |
567 | u32 ctrlb; | |
568 | ||
569 | dev_vdbg(chan2dev(chan), "prep_dma_memcpy: d0x%x s0x%x l0x%zx f0x%lx\n", | |
570 | dest, src, len, flags); | |
571 | ||
572 | if (unlikely(!len)) { | |
573 | dev_dbg(chan2dev(chan), "prep_dma_memcpy: length is zero!\n"); | |
574 | return NULL; | |
575 | } | |
576 | ||
9b3aa589 | 577 | ctrlb = ATC_DEFAULT_CTRLB | ATC_IEN |
dc78baa2 NF |
578 | | ATC_SRC_ADDR_MODE_INCR |
579 | | ATC_DST_ADDR_MODE_INCR | |
580 | | ATC_FC_MEM2MEM; | |
581 | ||
582 | /* | |
583 | * We can be a lot more clever here, but this should take care | |
584 | * of the most common optimization. | |
585 | */ | |
586 | if (!((src | dest | len) & 3)) { | |
b409ebfb | 587 | ctrla = ATC_SRC_WIDTH_WORD | ATC_DST_WIDTH_WORD; |
dc78baa2 NF |
588 | src_width = dst_width = 2; |
589 | } else if (!((src | dest | len) & 1)) { | |
b409ebfb | 590 | ctrla = ATC_SRC_WIDTH_HALFWORD | ATC_DST_WIDTH_HALFWORD; |
dc78baa2 NF |
591 | src_width = dst_width = 1; |
592 | } else { | |
b409ebfb | 593 | ctrla = ATC_SRC_WIDTH_BYTE | ATC_DST_WIDTH_BYTE; |
dc78baa2 NF |
594 | src_width = dst_width = 0; |
595 | } | |
596 | ||
597 | for (offset = 0; offset < len; offset += xfer_count << src_width) { | |
598 | xfer_count = min_t(size_t, (len - offset) >> src_width, | |
599 | ATC_BTSIZE_MAX); | |
600 | ||
601 | desc = atc_desc_get(atchan); | |
602 | if (!desc) | |
603 | goto err_desc_get; | |
604 | ||
605 | desc->lli.saddr = src + offset; | |
606 | desc->lli.daddr = dest + offset; | |
607 | desc->lli.ctrla = ctrla | xfer_count; | |
608 | desc->lli.ctrlb = ctrlb; | |
609 | ||
610 | desc->txd.cookie = 0; | |
dc78baa2 | 611 | |
e257e156 | 612 | atc_desc_chain(&first, &prev, desc); |
dc78baa2 NF |
613 | } |
614 | ||
615 | /* First descriptor of the chain embedds additional information */ | |
616 | first->txd.cookie = -EBUSY; | |
617 | first->len = len; | |
d088c33b | 618 | first->tx_width = src_width; |
dc78baa2 NF |
619 | |
620 | /* set end-of-link to the last link descriptor of list*/ | |
621 | set_desc_eol(desc); | |
622 | ||
568f7f0c | 623 | first->txd.flags = flags; /* client is in control of this ack */ |
dc78baa2 NF |
624 | |
625 | return &first->txd; | |
626 | ||
627 | err_desc_get: | |
628 | atc_desc_put(atchan, first); | |
629 | return NULL; | |
630 | } | |
631 | ||
808347f6 NF |
632 | |
633 | /** | |
634 | * atc_prep_slave_sg - prepare descriptors for a DMA_SLAVE transaction | |
635 | * @chan: DMA channel | |
636 | * @sgl: scatterlist to transfer to/from | |
637 | * @sg_len: number of entries in @scatterlist | |
638 | * @direction: DMA direction | |
639 | * @flags: tx descriptor status flags | |
185ecb5f | 640 | * @context: transaction context (ignored) |
808347f6 NF |
641 | */ |
642 | static struct dma_async_tx_descriptor * | |
643 | atc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, | |
db8196df | 644 | unsigned int sg_len, enum dma_transfer_direction direction, |
185ecb5f | 645 | unsigned long flags, void *context) |
808347f6 NF |
646 | { |
647 | struct at_dma_chan *atchan = to_at_dma_chan(chan); | |
648 | struct at_dma_slave *atslave = chan->private; | |
beeaa103 | 649 | struct dma_slave_config *sconfig = &atchan->dma_sconfig; |
808347f6 NF |
650 | struct at_desc *first = NULL; |
651 | struct at_desc *prev = NULL; | |
652 | u32 ctrla; | |
653 | u32 ctrlb; | |
654 | dma_addr_t reg; | |
655 | unsigned int reg_width; | |
656 | unsigned int mem_width; | |
657 | unsigned int i; | |
658 | struct scatterlist *sg; | |
659 | size_t total_len = 0; | |
660 | ||
cc52a10a NF |
661 | dev_vdbg(chan2dev(chan), "prep_slave_sg (%d): %s f0x%lx\n", |
662 | sg_len, | |
db8196df | 663 | direction == DMA_MEM_TO_DEV ? "TO DEVICE" : "FROM DEVICE", |
808347f6 NF |
664 | flags); |
665 | ||
666 | if (unlikely(!atslave || !sg_len)) { | |
c618a9be | 667 | dev_dbg(chan2dev(chan), "prep_slave_sg: sg length is zero!\n"); |
808347f6 NF |
668 | return NULL; |
669 | } | |
670 | ||
1dd1ea8e NF |
671 | ctrla = ATC_SCSIZE(sconfig->src_maxburst) |
672 | | ATC_DCSIZE(sconfig->dst_maxburst); | |
ae14d4b5 | 673 | ctrlb = ATC_IEN; |
808347f6 NF |
674 | |
675 | switch (direction) { | |
db8196df | 676 | case DMA_MEM_TO_DEV: |
beeaa103 | 677 | reg_width = convert_buswidth(sconfig->dst_addr_width); |
808347f6 NF |
678 | ctrla |= ATC_DST_WIDTH(reg_width); |
679 | ctrlb |= ATC_DST_ADDR_MODE_FIXED | |
680 | | ATC_SRC_ADDR_MODE_INCR | |
ae14d4b5 | 681 | | ATC_FC_MEM2PER |
bbe89c8e | 682 | | ATC_SIF(atchan->mem_if) | ATC_DIF(atchan->per_if); |
beeaa103 | 683 | reg = sconfig->dst_addr; |
808347f6 NF |
684 | for_each_sg(sgl, sg, sg_len, i) { |
685 | struct at_desc *desc; | |
686 | u32 len; | |
687 | u32 mem; | |
688 | ||
689 | desc = atc_desc_get(atchan); | |
690 | if (!desc) | |
691 | goto err_desc_get; | |
692 | ||
0f70e8ce | 693 | mem = sg_dma_address(sg); |
808347f6 | 694 | len = sg_dma_len(sg); |
c4567976 NF |
695 | if (unlikely(!len)) { |
696 | dev_dbg(chan2dev(chan), | |
697 | "prep_slave_sg: sg(%d) data length is zero\n", i); | |
698 | goto err; | |
699 | } | |
808347f6 NF |
700 | mem_width = 2; |
701 | if (unlikely(mem & 3 || len & 3)) | |
702 | mem_width = 0; | |
703 | ||
704 | desc->lli.saddr = mem; | |
705 | desc->lli.daddr = reg; | |
706 | desc->lli.ctrla = ctrla | |
707 | | ATC_SRC_WIDTH(mem_width) | |
708 | | len >> mem_width; | |
709 | desc->lli.ctrlb = ctrlb; | |
710 | ||
e257e156 | 711 | atc_desc_chain(&first, &prev, desc); |
808347f6 NF |
712 | total_len += len; |
713 | } | |
714 | break; | |
db8196df | 715 | case DMA_DEV_TO_MEM: |
beeaa103 | 716 | reg_width = convert_buswidth(sconfig->src_addr_width); |
808347f6 NF |
717 | ctrla |= ATC_SRC_WIDTH(reg_width); |
718 | ctrlb |= ATC_DST_ADDR_MODE_INCR | |
719 | | ATC_SRC_ADDR_MODE_FIXED | |
ae14d4b5 | 720 | | ATC_FC_PER2MEM |
bbe89c8e | 721 | | ATC_SIF(atchan->per_if) | ATC_DIF(atchan->mem_if); |
808347f6 | 722 | |
beeaa103 | 723 | reg = sconfig->src_addr; |
808347f6 NF |
724 | for_each_sg(sgl, sg, sg_len, i) { |
725 | struct at_desc *desc; | |
726 | u32 len; | |
727 | u32 mem; | |
728 | ||
729 | desc = atc_desc_get(atchan); | |
730 | if (!desc) | |
731 | goto err_desc_get; | |
732 | ||
0f70e8ce | 733 | mem = sg_dma_address(sg); |
808347f6 | 734 | len = sg_dma_len(sg); |
c4567976 NF |
735 | if (unlikely(!len)) { |
736 | dev_dbg(chan2dev(chan), | |
737 | "prep_slave_sg: sg(%d) data length is zero\n", i); | |
738 | goto err; | |
739 | } | |
808347f6 NF |
740 | mem_width = 2; |
741 | if (unlikely(mem & 3 || len & 3)) | |
742 | mem_width = 0; | |
743 | ||
744 | desc->lli.saddr = reg; | |
745 | desc->lli.daddr = mem; | |
746 | desc->lli.ctrla = ctrla | |
747 | | ATC_DST_WIDTH(mem_width) | |
59a609d9 | 748 | | len >> reg_width; |
808347f6 NF |
749 | desc->lli.ctrlb = ctrlb; |
750 | ||
e257e156 | 751 | atc_desc_chain(&first, &prev, desc); |
808347f6 NF |
752 | total_len += len; |
753 | } | |
754 | break; | |
755 | default: | |
756 | return NULL; | |
757 | } | |
758 | ||
759 | /* set end-of-link to the last link descriptor of list*/ | |
760 | set_desc_eol(prev); | |
761 | ||
762 | /* First descriptor of the chain embedds additional information */ | |
763 | first->txd.cookie = -EBUSY; | |
764 | first->len = total_len; | |
d088c33b | 765 | first->tx_width = reg_width; |
808347f6 | 766 | |
568f7f0c NF |
767 | /* first link descriptor of list is responsible of flags */ |
768 | first->txd.flags = flags; /* client is in control of this ack */ | |
808347f6 NF |
769 | |
770 | return &first->txd; | |
771 | ||
772 | err_desc_get: | |
773 | dev_err(chan2dev(chan), "not enough descriptors available\n"); | |
c4567976 | 774 | err: |
808347f6 NF |
775 | atc_desc_put(atchan, first); |
776 | return NULL; | |
777 | } | |
778 | ||
53830cc7 NF |
779 | /** |
780 | * atc_dma_cyclic_check_values | |
781 | * Check for too big/unaligned periods and unaligned DMA buffer | |
782 | */ | |
783 | static int | |
784 | atc_dma_cyclic_check_values(unsigned int reg_width, dma_addr_t buf_addr, | |
0e7264cc | 785 | size_t period_len) |
53830cc7 NF |
786 | { |
787 | if (period_len > (ATC_BTSIZE_MAX << reg_width)) | |
788 | goto err_out; | |
789 | if (unlikely(period_len & ((1 << reg_width) - 1))) | |
790 | goto err_out; | |
791 | if (unlikely(buf_addr & ((1 << reg_width) - 1))) | |
792 | goto err_out; | |
53830cc7 NF |
793 | |
794 | return 0; | |
795 | ||
796 | err_out: | |
797 | return -EINVAL; | |
798 | } | |
799 | ||
800 | /** | |
d73111c6 | 801 | * atc_dma_cyclic_fill_desc - Fill one period descriptor |
53830cc7 NF |
802 | */ |
803 | static int | |
beeaa103 | 804 | atc_dma_cyclic_fill_desc(struct dma_chan *chan, struct at_desc *desc, |
53830cc7 | 805 | unsigned int period_index, dma_addr_t buf_addr, |
beeaa103 NF |
806 | unsigned int reg_width, size_t period_len, |
807 | enum dma_transfer_direction direction) | |
53830cc7 | 808 | { |
beeaa103 | 809 | struct at_dma_chan *atchan = to_at_dma_chan(chan); |
beeaa103 NF |
810 | struct dma_slave_config *sconfig = &atchan->dma_sconfig; |
811 | u32 ctrla; | |
53830cc7 NF |
812 | |
813 | /* prepare common CRTLA value */ | |
1dd1ea8e NF |
814 | ctrla = ATC_SCSIZE(sconfig->src_maxburst) |
815 | | ATC_DCSIZE(sconfig->dst_maxburst) | |
53830cc7 NF |
816 | | ATC_DST_WIDTH(reg_width) |
817 | | ATC_SRC_WIDTH(reg_width) | |
818 | | period_len >> reg_width; | |
819 | ||
820 | switch (direction) { | |
db8196df | 821 | case DMA_MEM_TO_DEV: |
53830cc7 | 822 | desc->lli.saddr = buf_addr + (period_len * period_index); |
beeaa103 | 823 | desc->lli.daddr = sconfig->dst_addr; |
53830cc7 | 824 | desc->lli.ctrla = ctrla; |
ae14d4b5 | 825 | desc->lli.ctrlb = ATC_DST_ADDR_MODE_FIXED |
53830cc7 | 826 | | ATC_SRC_ADDR_MODE_INCR |
ae14d4b5 | 827 | | ATC_FC_MEM2PER |
bbe89c8e LD |
828 | | ATC_SIF(atchan->mem_if) |
829 | | ATC_DIF(atchan->per_if); | |
53830cc7 NF |
830 | break; |
831 | ||
db8196df | 832 | case DMA_DEV_TO_MEM: |
beeaa103 | 833 | desc->lli.saddr = sconfig->src_addr; |
53830cc7 NF |
834 | desc->lli.daddr = buf_addr + (period_len * period_index); |
835 | desc->lli.ctrla = ctrla; | |
ae14d4b5 | 836 | desc->lli.ctrlb = ATC_DST_ADDR_MODE_INCR |
53830cc7 | 837 | | ATC_SRC_ADDR_MODE_FIXED |
ae14d4b5 | 838 | | ATC_FC_PER2MEM |
bbe89c8e LD |
839 | | ATC_SIF(atchan->per_if) |
840 | | ATC_DIF(atchan->mem_if); | |
53830cc7 NF |
841 | break; |
842 | ||
843 | default: | |
844 | return -EINVAL; | |
845 | } | |
846 | ||
847 | return 0; | |
848 | } | |
849 | ||
850 | /** | |
851 | * atc_prep_dma_cyclic - prepare the cyclic DMA transfer | |
852 | * @chan: the DMA channel to prepare | |
853 | * @buf_addr: physical DMA address where the buffer starts | |
854 | * @buf_len: total number of bytes for the entire buffer | |
855 | * @period_len: number of bytes for each period | |
856 | * @direction: transfer direction, to or from device | |
ec8b5e48 | 857 | * @flags: tx descriptor status flags |
185ecb5f | 858 | * @context: transfer context (ignored) |
53830cc7 NF |
859 | */ |
860 | static struct dma_async_tx_descriptor * | |
861 | atc_prep_dma_cyclic(struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len, | |
185ecb5f | 862 | size_t period_len, enum dma_transfer_direction direction, |
ec8b5e48 | 863 | unsigned long flags, void *context) |
53830cc7 NF |
864 | { |
865 | struct at_dma_chan *atchan = to_at_dma_chan(chan); | |
866 | struct at_dma_slave *atslave = chan->private; | |
beeaa103 | 867 | struct dma_slave_config *sconfig = &atchan->dma_sconfig; |
53830cc7 NF |
868 | struct at_desc *first = NULL; |
869 | struct at_desc *prev = NULL; | |
870 | unsigned long was_cyclic; | |
beeaa103 | 871 | unsigned int reg_width; |
53830cc7 NF |
872 | unsigned int periods = buf_len / period_len; |
873 | unsigned int i; | |
874 | ||
875 | dev_vdbg(chan2dev(chan), "prep_dma_cyclic: %s buf@0x%08x - %d (%d/%d)\n", | |
db8196df | 876 | direction == DMA_MEM_TO_DEV ? "TO DEVICE" : "FROM DEVICE", |
53830cc7 NF |
877 | buf_addr, |
878 | periods, buf_len, period_len); | |
879 | ||
880 | if (unlikely(!atslave || !buf_len || !period_len)) { | |
881 | dev_dbg(chan2dev(chan), "prep_dma_cyclic: length is zero!\n"); | |
882 | return NULL; | |
883 | } | |
884 | ||
885 | was_cyclic = test_and_set_bit(ATC_IS_CYCLIC, &atchan->status); | |
886 | if (was_cyclic) { | |
887 | dev_dbg(chan2dev(chan), "prep_dma_cyclic: channel in use!\n"); | |
888 | return NULL; | |
889 | } | |
890 | ||
0e7264cc AS |
891 | if (unlikely(!is_slave_direction(direction))) |
892 | goto err_out; | |
893 | ||
beeaa103 NF |
894 | if (sconfig->direction == DMA_MEM_TO_DEV) |
895 | reg_width = convert_buswidth(sconfig->dst_addr_width); | |
896 | else | |
897 | reg_width = convert_buswidth(sconfig->src_addr_width); | |
898 | ||
53830cc7 | 899 | /* Check for too big/unaligned periods and unaligned DMA buffer */ |
0e7264cc | 900 | if (atc_dma_cyclic_check_values(reg_width, buf_addr, period_len)) |
53830cc7 NF |
901 | goto err_out; |
902 | ||
903 | /* build cyclic linked list */ | |
904 | for (i = 0; i < periods; i++) { | |
905 | struct at_desc *desc; | |
906 | ||
907 | desc = atc_desc_get(atchan); | |
908 | if (!desc) | |
909 | goto err_desc_get; | |
910 | ||
beeaa103 NF |
911 | if (atc_dma_cyclic_fill_desc(chan, desc, i, buf_addr, |
912 | reg_width, period_len, direction)) | |
53830cc7 NF |
913 | goto err_desc_get; |
914 | ||
915 | atc_desc_chain(&first, &prev, desc); | |
916 | } | |
917 | ||
918 | /* lets make a cyclic list */ | |
919 | prev->lli.dscr = first->txd.phys; | |
920 | ||
921 | /* First descriptor of the chain embedds additional information */ | |
922 | first->txd.cookie = -EBUSY; | |
923 | first->len = buf_len; | |
d088c33b | 924 | first->tx_width = reg_width; |
53830cc7 NF |
925 | |
926 | return &first->txd; | |
927 | ||
928 | err_desc_get: | |
929 | dev_err(chan2dev(chan), "not enough descriptors available\n"); | |
930 | atc_desc_put(atchan, first); | |
931 | err_out: | |
932 | clear_bit(ATC_IS_CYCLIC, &atchan->status); | |
933 | return NULL; | |
934 | } | |
935 | ||
beeaa103 NF |
936 | static int set_runtime_config(struct dma_chan *chan, |
937 | struct dma_slave_config *sconfig) | |
938 | { | |
939 | struct at_dma_chan *atchan = to_at_dma_chan(chan); | |
940 | ||
941 | /* Check if it is chan is configured for slave transfers */ | |
942 | if (!chan->private) | |
943 | return -EINVAL; | |
944 | ||
945 | memcpy(&atchan->dma_sconfig, sconfig, sizeof(*sconfig)); | |
946 | ||
947 | convert_burst(&atchan->dma_sconfig.src_maxburst); | |
948 | convert_burst(&atchan->dma_sconfig.dst_maxburst); | |
949 | ||
950 | return 0; | |
951 | } | |
952 | ||
53830cc7 | 953 | |
05827630 LW |
954 | static int atc_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, |
955 | unsigned long arg) | |
808347f6 NF |
956 | { |
957 | struct at_dma_chan *atchan = to_at_dma_chan(chan); | |
958 | struct at_dma *atdma = to_at_dma(chan->device); | |
23b5e3ad | 959 | int chan_id = atchan->chan_common.chan_id; |
d8cb04b0 | 960 | unsigned long flags; |
23b5e3ad | 961 | |
808347f6 NF |
962 | LIST_HEAD(list); |
963 | ||
23b5e3ad | 964 | dev_vdbg(chan2dev(chan), "atc_control (%d)\n", cmd); |
c3635c78 | 965 | |
23b5e3ad | 966 | if (cmd == DMA_PAUSE) { |
d8cb04b0 | 967 | spin_lock_irqsave(&atchan->lock, flags); |
808347f6 | 968 | |
23b5e3ad | 969 | dma_writel(atdma, CHER, AT_DMA_SUSP(chan_id)); |
23b5e3ad | 970 | set_bit(ATC_IS_PAUSED, &atchan->status); |
808347f6 | 971 | |
d8cb04b0 | 972 | spin_unlock_irqrestore(&atchan->lock, flags); |
23b5e3ad | 973 | } else if (cmd == DMA_RESUME) { |
3c477482 | 974 | if (!atc_chan_is_paused(atchan)) |
23b5e3ad | 975 | return 0; |
808347f6 | 976 | |
d8cb04b0 | 977 | spin_lock_irqsave(&atchan->lock, flags); |
808347f6 | 978 | |
23b5e3ad NF |
979 | dma_writel(atdma, CHDR, AT_DMA_RES(chan_id)); |
980 | clear_bit(ATC_IS_PAUSED, &atchan->status); | |
c3635c78 | 981 | |
d8cb04b0 | 982 | spin_unlock_irqrestore(&atchan->lock, flags); |
23b5e3ad NF |
983 | } else if (cmd == DMA_TERMINATE_ALL) { |
984 | struct at_desc *desc, *_desc; | |
985 | /* | |
986 | * This is only called when something went wrong elsewhere, so | |
987 | * we don't really care about the data. Just disable the | |
988 | * channel. We still have to poll the channel enable bit due | |
989 | * to AHB/HSB limitations. | |
990 | */ | |
d8cb04b0 | 991 | spin_lock_irqsave(&atchan->lock, flags); |
23b5e3ad NF |
992 | |
993 | /* disabling channel: must also remove suspend state */ | |
994 | dma_writel(atdma, CHDR, AT_DMA_RES(chan_id) | atchan->mask); | |
995 | ||
996 | /* confirm that this channel is disabled */ | |
997 | while (dma_readl(atdma, CHSR) & atchan->mask) | |
998 | cpu_relax(); | |
999 | ||
1000 | /* active_list entries will end up before queued entries */ | |
1001 | list_splice_init(&atchan->queue, &list); | |
1002 | list_splice_init(&atchan->active_list, &list); | |
1003 | ||
1004 | /* Flush all pending and queued descriptors */ | |
1005 | list_for_each_entry_safe(desc, _desc, &list, desc_node) | |
1006 | atc_chain_complete(atchan, desc); | |
1007 | ||
1008 | clear_bit(ATC_IS_PAUSED, &atchan->status); | |
1009 | /* if channel dedicated to cyclic operations, free it */ | |
1010 | clear_bit(ATC_IS_CYCLIC, &atchan->status); | |
1011 | ||
d8cb04b0 | 1012 | spin_unlock_irqrestore(&atchan->lock, flags); |
beeaa103 NF |
1013 | } else if (cmd == DMA_SLAVE_CONFIG) { |
1014 | return set_runtime_config(chan, (struct dma_slave_config *)arg); | |
23b5e3ad NF |
1015 | } else { |
1016 | return -ENXIO; | |
1017 | } | |
b0ebeb9c | 1018 | |
c3635c78 | 1019 | return 0; |
808347f6 NF |
1020 | } |
1021 | ||
dc78baa2 | 1022 | /** |
07934481 | 1023 | * atc_tx_status - poll for transaction completion |
dc78baa2 NF |
1024 | * @chan: DMA channel |
1025 | * @cookie: transaction identifier to check status of | |
07934481 | 1026 | * @txstate: if not %NULL updated with transaction state |
dc78baa2 | 1027 | * |
07934481 | 1028 | * If @txstate is passed in, upon return it reflect the driver |
dc78baa2 NF |
1029 | * internal state and can be used with dma_async_is_complete() to check |
1030 | * the status of multiple cookies without re-checking hardware state. | |
1031 | */ | |
1032 | static enum dma_status | |
07934481 | 1033 | atc_tx_status(struct dma_chan *chan, |
dc78baa2 | 1034 | dma_cookie_t cookie, |
07934481 | 1035 | struct dma_tx_state *txstate) |
dc78baa2 NF |
1036 | { |
1037 | struct at_dma_chan *atchan = to_at_dma_chan(chan); | |
1038 | dma_cookie_t last_used; | |
1039 | dma_cookie_t last_complete; | |
d8cb04b0 | 1040 | unsigned long flags; |
dc78baa2 NF |
1041 | enum dma_status ret; |
1042 | ||
d8cb04b0 | 1043 | spin_lock_irqsave(&atchan->lock, flags); |
dc78baa2 | 1044 | |
96a2af41 | 1045 | ret = dma_cookie_status(chan, cookie, txstate); |
dc78baa2 NF |
1046 | if (ret != DMA_SUCCESS) { |
1047 | atc_cleanup_descriptors(atchan); | |
1048 | ||
96a2af41 | 1049 | ret = dma_cookie_status(chan, cookie, txstate); |
dc78baa2 NF |
1050 | } |
1051 | ||
96a2af41 RKAL |
1052 | last_complete = chan->completed_cookie; |
1053 | last_used = chan->cookie; | |
1054 | ||
d8cb04b0 | 1055 | spin_unlock_irqrestore(&atchan->lock, flags); |
dc78baa2 | 1056 | |
543aabc7 | 1057 | if (ret != DMA_SUCCESS) |
96a2af41 | 1058 | dma_set_residue(txstate, atc_first_active(atchan)->len); |
543aabc7 | 1059 | |
3c477482 | 1060 | if (atc_chan_is_paused(atchan)) |
23b5e3ad NF |
1061 | ret = DMA_PAUSED; |
1062 | ||
1063 | dev_vdbg(chan2dev(chan), "tx_status %d: cookie = %d (d%d, u%d)\n", | |
1064 | ret, cookie, last_complete ? last_complete : 0, | |
07934481 | 1065 | last_used ? last_used : 0); |
dc78baa2 NF |
1066 | |
1067 | return ret; | |
1068 | } | |
1069 | ||
1070 | /** | |
1071 | * atc_issue_pending - try to finish work | |
1072 | * @chan: target DMA channel | |
1073 | */ | |
1074 | static void atc_issue_pending(struct dma_chan *chan) | |
1075 | { | |
1076 | struct at_dma_chan *atchan = to_at_dma_chan(chan); | |
d8cb04b0 | 1077 | unsigned long flags; |
dc78baa2 NF |
1078 | |
1079 | dev_vdbg(chan2dev(chan), "issue_pending\n"); | |
1080 | ||
53830cc7 | 1081 | /* Not needed for cyclic transfers */ |
3c477482 | 1082 | if (atc_chan_is_cyclic(atchan)) |
53830cc7 NF |
1083 | return; |
1084 | ||
d8cb04b0 | 1085 | spin_lock_irqsave(&atchan->lock, flags); |
d202f051 | 1086 | atc_advance_work(atchan); |
d8cb04b0 | 1087 | spin_unlock_irqrestore(&atchan->lock, flags); |
dc78baa2 NF |
1088 | } |
1089 | ||
1090 | /** | |
1091 | * atc_alloc_chan_resources - allocate resources for DMA channel | |
1092 | * @chan: allocate descriptor resources for this channel | |
1093 | * @client: current client requesting the channel be ready for requests | |
1094 | * | |
1095 | * return - the number of allocated descriptors | |
1096 | */ | |
1097 | static int atc_alloc_chan_resources(struct dma_chan *chan) | |
1098 | { | |
1099 | struct at_dma_chan *atchan = to_at_dma_chan(chan); | |
1100 | struct at_dma *atdma = to_at_dma(chan->device); | |
1101 | struct at_desc *desc; | |
808347f6 | 1102 | struct at_dma_slave *atslave; |
d8cb04b0 | 1103 | unsigned long flags; |
dc78baa2 | 1104 | int i; |
808347f6 | 1105 | u32 cfg; |
dc78baa2 NF |
1106 | LIST_HEAD(tmp_list); |
1107 | ||
1108 | dev_vdbg(chan2dev(chan), "alloc_chan_resources\n"); | |
1109 | ||
1110 | /* ASSERT: channel is idle */ | |
1111 | if (atc_chan_is_enabled(atchan)) { | |
1112 | dev_dbg(chan2dev(chan), "DMA channel not idle ?\n"); | |
1113 | return -EIO; | |
1114 | } | |
1115 | ||
808347f6 NF |
1116 | cfg = ATC_DEFAULT_CFG; |
1117 | ||
1118 | atslave = chan->private; | |
1119 | if (atslave) { | |
1120 | /* | |
1121 | * We need controller-specific data to set up slave | |
1122 | * transfers. | |
1123 | */ | |
1124 | BUG_ON(!atslave->dma_dev || atslave->dma_dev != atdma->dma_common.dev); | |
1125 | ||
ea7e7906 | 1126 | /* if cfg configuration specified take it instead of default */ |
808347f6 NF |
1127 | if (atslave->cfg) |
1128 | cfg = atslave->cfg; | |
1129 | } | |
1130 | ||
1131 | /* have we already been set up? | |
1132 | * reconfigure channel but no need to reallocate descriptors */ | |
dc78baa2 NF |
1133 | if (!list_empty(&atchan->free_list)) |
1134 | return atchan->descs_allocated; | |
1135 | ||
1136 | /* Allocate initial pool of descriptors */ | |
1137 | for (i = 0; i < init_nr_desc_per_channel; i++) { | |
1138 | desc = atc_alloc_descriptor(chan, GFP_KERNEL); | |
1139 | if (!desc) { | |
1140 | dev_err(atdma->dma_common.dev, | |
1141 | "Only %d initial descriptors\n", i); | |
1142 | break; | |
1143 | } | |
1144 | list_add_tail(&desc->desc_node, &tmp_list); | |
1145 | } | |
1146 | ||
d8cb04b0 | 1147 | spin_lock_irqsave(&atchan->lock, flags); |
dc78baa2 NF |
1148 | atchan->descs_allocated = i; |
1149 | list_splice(&tmp_list, &atchan->free_list); | |
d3ee98cd | 1150 | dma_cookie_init(chan); |
d8cb04b0 | 1151 | spin_unlock_irqrestore(&atchan->lock, flags); |
dc78baa2 NF |
1152 | |
1153 | /* channel parameters */ | |
808347f6 | 1154 | channel_writel(atchan, CFG, cfg); |
dc78baa2 NF |
1155 | |
1156 | dev_dbg(chan2dev(chan), | |
1157 | "alloc_chan_resources: allocated %d descriptors\n", | |
1158 | atchan->descs_allocated); | |
1159 | ||
1160 | return atchan->descs_allocated; | |
1161 | } | |
1162 | ||
1163 | /** | |
1164 | * atc_free_chan_resources - free all channel resources | |
1165 | * @chan: DMA channel | |
1166 | */ | |
1167 | static void atc_free_chan_resources(struct dma_chan *chan) | |
1168 | { | |
1169 | struct at_dma_chan *atchan = to_at_dma_chan(chan); | |
1170 | struct at_dma *atdma = to_at_dma(chan->device); | |
1171 | struct at_desc *desc, *_desc; | |
1172 | LIST_HEAD(list); | |
1173 | ||
1174 | dev_dbg(chan2dev(chan), "free_chan_resources: (descs allocated=%u)\n", | |
1175 | atchan->descs_allocated); | |
1176 | ||
1177 | /* ASSERT: channel is idle */ | |
1178 | BUG_ON(!list_empty(&atchan->active_list)); | |
1179 | BUG_ON(!list_empty(&atchan->queue)); | |
1180 | BUG_ON(atc_chan_is_enabled(atchan)); | |
1181 | ||
1182 | list_for_each_entry_safe(desc, _desc, &atchan->free_list, desc_node) { | |
1183 | dev_vdbg(chan2dev(chan), " freeing descriptor %p\n", desc); | |
1184 | list_del(&desc->desc_node); | |
1185 | /* free link descriptor */ | |
1186 | dma_pool_free(atdma->dma_desc_pool, desc, desc->txd.phys); | |
1187 | } | |
1188 | list_splice_init(&atchan->free_list, &list); | |
1189 | atchan->descs_allocated = 0; | |
53830cc7 | 1190 | atchan->status = 0; |
dc78baa2 NF |
1191 | |
1192 | dev_vdbg(chan2dev(chan), "free_chan_resources: done\n"); | |
1193 | } | |
1194 | ||
bbe89c8e LD |
1195 | #ifdef CONFIG_OF |
1196 | static bool at_dma_filter(struct dma_chan *chan, void *slave) | |
1197 | { | |
1198 | struct at_dma_slave *atslave = slave; | |
1199 | ||
1200 | if (atslave->dma_dev == chan->device->dev) { | |
1201 | chan->private = atslave; | |
1202 | return true; | |
1203 | } else { | |
1204 | return false; | |
1205 | } | |
1206 | } | |
1207 | ||
1208 | static struct dma_chan *at_dma_xlate(struct of_phandle_args *dma_spec, | |
1209 | struct of_dma *of_dma) | |
1210 | { | |
1211 | struct dma_chan *chan; | |
1212 | struct at_dma_chan *atchan; | |
1213 | struct at_dma_slave *atslave; | |
1214 | dma_cap_mask_t mask; | |
1215 | unsigned int per_id; | |
1216 | struct platform_device *dmac_pdev; | |
1217 | ||
1218 | if (dma_spec->args_count != 2) | |
1219 | return NULL; | |
1220 | ||
1221 | dmac_pdev = of_find_device_by_node(dma_spec->np); | |
1222 | ||
1223 | dma_cap_zero(mask); | |
1224 | dma_cap_set(DMA_SLAVE, mask); | |
1225 | ||
1226 | atslave = devm_kzalloc(&dmac_pdev->dev, sizeof(*atslave), GFP_KERNEL); | |
1227 | if (!atslave) | |
1228 | return NULL; | |
1229 | /* | |
1230 | * We can fill both SRC_PER and DST_PER, one of these fields will be | |
1231 | * ignored depending on DMA transfer direction. | |
1232 | */ | |
1233 | per_id = dma_spec->args[1]; | |
6c22770f NF |
1234 | atslave->cfg = ATC_FIFOCFG_HALFFIFO |
1235 | | ATC_DST_H2SEL_HW | ATC_SRC_H2SEL_HW | |
1236 | | ATC_DST_PER_MSB(per_id) | ATC_DST_PER(per_id) | |
1237 | | ATC_SRC_PER_MSB(per_id) | ATC_SRC_PER(per_id); | |
bbe89c8e LD |
1238 | atslave->dma_dev = &dmac_pdev->dev; |
1239 | ||
1240 | chan = dma_request_channel(mask, at_dma_filter, atslave); | |
1241 | if (!chan) | |
1242 | return NULL; | |
1243 | ||
1244 | atchan = to_at_dma_chan(chan); | |
1245 | atchan->per_if = dma_spec->args[0] & 0xff; | |
1246 | atchan->mem_if = (dma_spec->args[0] >> 16) & 0xff; | |
1247 | ||
1248 | return chan; | |
1249 | } | |
1250 | #else | |
1251 | static struct dma_chan *at_dma_xlate(struct of_phandle_args *dma_spec, | |
1252 | struct of_dma *of_dma) | |
1253 | { | |
1254 | return NULL; | |
1255 | } | |
1256 | #endif | |
dc78baa2 NF |
1257 | |
1258 | /*-- Module Management -----------------------------------------------*/ | |
1259 | ||
02f88be9 NF |
1260 | /* cap_mask is a multi-u32 bitfield, fill it with proper C code. */ |
1261 | static struct at_dma_platform_data at91sam9rl_config = { | |
1262 | .nr_channels = 2, | |
1263 | }; | |
1264 | static struct at_dma_platform_data at91sam9g45_config = { | |
1265 | .nr_channels = 8, | |
1266 | }; | |
1267 | ||
c5115953 NF |
1268 | #if defined(CONFIG_OF) |
1269 | static const struct of_device_id atmel_dma_dt_ids[] = { | |
1270 | { | |
1271 | .compatible = "atmel,at91sam9rl-dma", | |
02f88be9 | 1272 | .data = &at91sam9rl_config, |
c5115953 NF |
1273 | }, { |
1274 | .compatible = "atmel,at91sam9g45-dma", | |
02f88be9 | 1275 | .data = &at91sam9g45_config, |
dcc81734 NF |
1276 | }, { |
1277 | /* sentinel */ | |
1278 | } | |
c5115953 NF |
1279 | }; |
1280 | ||
1281 | MODULE_DEVICE_TABLE(of, atmel_dma_dt_ids); | |
1282 | #endif | |
1283 | ||
0ab88a01 | 1284 | static const struct platform_device_id atdma_devtypes[] = { |
67348450 NF |
1285 | { |
1286 | .name = "at91sam9rl_dma", | |
02f88be9 | 1287 | .driver_data = (unsigned long) &at91sam9rl_config, |
67348450 NF |
1288 | }, { |
1289 | .name = "at91sam9g45_dma", | |
02f88be9 | 1290 | .driver_data = (unsigned long) &at91sam9g45_config, |
67348450 NF |
1291 | }, { |
1292 | /* sentinel */ | |
1293 | } | |
1294 | }; | |
1295 | ||
7fd63ccd | 1296 | static inline const struct at_dma_platform_data * __init at_dma_get_driver_data( |
02f88be9 | 1297 | struct platform_device *pdev) |
c5115953 NF |
1298 | { |
1299 | if (pdev->dev.of_node) { | |
1300 | const struct of_device_id *match; | |
1301 | match = of_match_node(atmel_dma_dt_ids, pdev->dev.of_node); | |
1302 | if (match == NULL) | |
02f88be9 NF |
1303 | return NULL; |
1304 | return match->data; | |
c5115953 | 1305 | } |
02f88be9 NF |
1306 | return (struct at_dma_platform_data *) |
1307 | platform_get_device_id(pdev)->driver_data; | |
c5115953 NF |
1308 | } |
1309 | ||
dc78baa2 NF |
1310 | /** |
1311 | * at_dma_off - disable DMA controller | |
1312 | * @atdma: the Atmel HDAMC device | |
1313 | */ | |
1314 | static void at_dma_off(struct at_dma *atdma) | |
1315 | { | |
1316 | dma_writel(atdma, EN, 0); | |
1317 | ||
1318 | /* disable all interrupts */ | |
1319 | dma_writel(atdma, EBCIDR, -1L); | |
1320 | ||
1321 | /* confirm that all channels are disabled */ | |
1322 | while (dma_readl(atdma, CHSR) & atdma->all_chan_mask) | |
1323 | cpu_relax(); | |
1324 | } | |
1325 | ||
1326 | static int __init at_dma_probe(struct platform_device *pdev) | |
1327 | { | |
dc78baa2 NF |
1328 | struct resource *io; |
1329 | struct at_dma *atdma; | |
1330 | size_t size; | |
1331 | int irq; | |
1332 | int err; | |
1333 | int i; | |
7fd63ccd | 1334 | const struct at_dma_platform_data *plat_dat; |
67348450 | 1335 | |
02f88be9 NF |
1336 | /* setup platform data for each SoC */ |
1337 | dma_cap_set(DMA_MEMCPY, at91sam9rl_config.cap_mask); | |
1338 | dma_cap_set(DMA_MEMCPY, at91sam9g45_config.cap_mask); | |
1339 | dma_cap_set(DMA_SLAVE, at91sam9g45_config.cap_mask); | |
67348450 NF |
1340 | |
1341 | /* get DMA parameters from controller type */ | |
02f88be9 NF |
1342 | plat_dat = at_dma_get_driver_data(pdev); |
1343 | if (!plat_dat) | |
1344 | return -ENODEV; | |
dc78baa2 NF |
1345 | |
1346 | io = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
1347 | if (!io) | |
1348 | return -EINVAL; | |
1349 | ||
1350 | irq = platform_get_irq(pdev, 0); | |
1351 | if (irq < 0) | |
1352 | return irq; | |
1353 | ||
1354 | size = sizeof(struct at_dma); | |
02f88be9 | 1355 | size += plat_dat->nr_channels * sizeof(struct at_dma_chan); |
dc78baa2 NF |
1356 | atdma = kzalloc(size, GFP_KERNEL); |
1357 | if (!atdma) | |
1358 | return -ENOMEM; | |
1359 | ||
67348450 | 1360 | /* discover transaction capabilities */ |
02f88be9 NF |
1361 | atdma->dma_common.cap_mask = plat_dat->cap_mask; |
1362 | atdma->all_chan_mask = (1 << plat_dat->nr_channels) - 1; | |
dc78baa2 | 1363 | |
114df7d6 | 1364 | size = resource_size(io); |
dc78baa2 NF |
1365 | if (!request_mem_region(io->start, size, pdev->dev.driver->name)) { |
1366 | err = -EBUSY; | |
1367 | goto err_kfree; | |
1368 | } | |
1369 | ||
1370 | atdma->regs = ioremap(io->start, size); | |
1371 | if (!atdma->regs) { | |
1372 | err = -ENOMEM; | |
1373 | goto err_release_r; | |
1374 | } | |
1375 | ||
1376 | atdma->clk = clk_get(&pdev->dev, "dma_clk"); | |
1377 | if (IS_ERR(atdma->clk)) { | |
1378 | err = PTR_ERR(atdma->clk); | |
1379 | goto err_clk; | |
1380 | } | |
1381 | clk_enable(atdma->clk); | |
1382 | ||
1383 | /* force dma off, just in case */ | |
1384 | at_dma_off(atdma); | |
1385 | ||
1386 | err = request_irq(irq, at_dma_interrupt, 0, "at_hdmac", atdma); | |
1387 | if (err) | |
1388 | goto err_irq; | |
1389 | ||
1390 | platform_set_drvdata(pdev, atdma); | |
1391 | ||
1392 | /* create a pool of consistent memory blocks for hardware descriptors */ | |
1393 | atdma->dma_desc_pool = dma_pool_create("at_hdmac_desc_pool", | |
1394 | &pdev->dev, sizeof(struct at_desc), | |
1395 | 4 /* word alignment */, 0); | |
1396 | if (!atdma->dma_desc_pool) { | |
1397 | dev_err(&pdev->dev, "No memory for descriptors dma pool\n"); | |
1398 | err = -ENOMEM; | |
1399 | goto err_pool_create; | |
1400 | } | |
1401 | ||
1402 | /* clear any pending interrupt */ | |
1403 | while (dma_readl(atdma, EBCISR)) | |
1404 | cpu_relax(); | |
1405 | ||
1406 | /* initialize channels related values */ | |
1407 | INIT_LIST_HEAD(&atdma->dma_common.channels); | |
02f88be9 | 1408 | for (i = 0; i < plat_dat->nr_channels; i++) { |
dc78baa2 NF |
1409 | struct at_dma_chan *atchan = &atdma->chan[i]; |
1410 | ||
bbe89c8e LD |
1411 | atchan->mem_if = AT_DMA_MEM_IF; |
1412 | atchan->per_if = AT_DMA_PER_IF; | |
dc78baa2 | 1413 | atchan->chan_common.device = &atdma->dma_common; |
d3ee98cd | 1414 | dma_cookie_init(&atchan->chan_common); |
dc78baa2 NF |
1415 | list_add_tail(&atchan->chan_common.device_node, |
1416 | &atdma->dma_common.channels); | |
1417 | ||
1418 | atchan->ch_regs = atdma->regs + ch_regs(i); | |
1419 | spin_lock_init(&atchan->lock); | |
1420 | atchan->mask = 1 << i; | |
1421 | ||
1422 | INIT_LIST_HEAD(&atchan->active_list); | |
1423 | INIT_LIST_HEAD(&atchan->queue); | |
1424 | INIT_LIST_HEAD(&atchan->free_list); | |
1425 | ||
1426 | tasklet_init(&atchan->tasklet, atc_tasklet, | |
1427 | (unsigned long)atchan); | |
bda3a47c | 1428 | atc_enable_chan_irq(atdma, i); |
dc78baa2 NF |
1429 | } |
1430 | ||
1431 | /* set base routines */ | |
1432 | atdma->dma_common.device_alloc_chan_resources = atc_alloc_chan_resources; | |
1433 | atdma->dma_common.device_free_chan_resources = atc_free_chan_resources; | |
07934481 | 1434 | atdma->dma_common.device_tx_status = atc_tx_status; |
dc78baa2 NF |
1435 | atdma->dma_common.device_issue_pending = atc_issue_pending; |
1436 | atdma->dma_common.dev = &pdev->dev; | |
1437 | ||
1438 | /* set prep routines based on capability */ | |
1439 | if (dma_has_cap(DMA_MEMCPY, atdma->dma_common.cap_mask)) | |
1440 | atdma->dma_common.device_prep_dma_memcpy = atc_prep_dma_memcpy; | |
1441 | ||
d7db8080 | 1442 | if (dma_has_cap(DMA_SLAVE, atdma->dma_common.cap_mask)) { |
808347f6 | 1443 | atdma->dma_common.device_prep_slave_sg = atc_prep_slave_sg; |
d7db8080 NF |
1444 | /* controller can do slave DMA: can trigger cyclic transfers */ |
1445 | dma_cap_set(DMA_CYCLIC, atdma->dma_common.cap_mask); | |
53830cc7 | 1446 | atdma->dma_common.device_prep_dma_cyclic = atc_prep_dma_cyclic; |
c3635c78 | 1447 | atdma->dma_common.device_control = atc_control; |
d7db8080 | 1448 | } |
808347f6 | 1449 | |
dc78baa2 NF |
1450 | dma_writel(atdma, EN, AT_DMA_ENABLE); |
1451 | ||
1452 | dev_info(&pdev->dev, "Atmel AHB DMA Controller ( %s%s), %d channels\n", | |
1453 | dma_has_cap(DMA_MEMCPY, atdma->dma_common.cap_mask) ? "cpy " : "", | |
1454 | dma_has_cap(DMA_SLAVE, atdma->dma_common.cap_mask) ? "slave " : "", | |
02f88be9 | 1455 | plat_dat->nr_channels); |
dc78baa2 NF |
1456 | |
1457 | dma_async_device_register(&atdma->dma_common); | |
1458 | ||
bbe89c8e LD |
1459 | /* |
1460 | * Do not return an error if the dmac node is not present in order to | |
1461 | * not break the existing way of requesting channel with | |
1462 | * dma_request_channel(). | |
1463 | */ | |
1464 | if (pdev->dev.of_node) { | |
1465 | err = of_dma_controller_register(pdev->dev.of_node, | |
1466 | at_dma_xlate, atdma); | |
1467 | if (err) { | |
1468 | dev_err(&pdev->dev, "could not register of_dma_controller\n"); | |
1469 | goto err_of_dma_controller_register; | |
1470 | } | |
1471 | } | |
1472 | ||
dc78baa2 NF |
1473 | return 0; |
1474 | ||
bbe89c8e LD |
1475 | err_of_dma_controller_register: |
1476 | dma_async_device_unregister(&atdma->dma_common); | |
1477 | dma_pool_destroy(atdma->dma_desc_pool); | |
dc78baa2 NF |
1478 | err_pool_create: |
1479 | platform_set_drvdata(pdev, NULL); | |
1480 | free_irq(platform_get_irq(pdev, 0), atdma); | |
1481 | err_irq: | |
1482 | clk_disable(atdma->clk); | |
1483 | clk_put(atdma->clk); | |
1484 | err_clk: | |
1485 | iounmap(atdma->regs); | |
1486 | atdma->regs = NULL; | |
1487 | err_release_r: | |
1488 | release_mem_region(io->start, size); | |
1489 | err_kfree: | |
1490 | kfree(atdma); | |
1491 | return err; | |
1492 | } | |
1493 | ||
1d1bbd30 | 1494 | static int at_dma_remove(struct platform_device *pdev) |
dc78baa2 NF |
1495 | { |
1496 | struct at_dma *atdma = platform_get_drvdata(pdev); | |
1497 | struct dma_chan *chan, *_chan; | |
1498 | struct resource *io; | |
1499 | ||
1500 | at_dma_off(atdma); | |
1501 | dma_async_device_unregister(&atdma->dma_common); | |
1502 | ||
1503 | dma_pool_destroy(atdma->dma_desc_pool); | |
1504 | platform_set_drvdata(pdev, NULL); | |
1505 | free_irq(platform_get_irq(pdev, 0), atdma); | |
1506 | ||
1507 | list_for_each_entry_safe(chan, _chan, &atdma->dma_common.channels, | |
1508 | device_node) { | |
1509 | struct at_dma_chan *atchan = to_at_dma_chan(chan); | |
1510 | ||
1511 | /* Disable interrupts */ | |
bda3a47c | 1512 | atc_disable_chan_irq(atdma, chan->chan_id); |
dc78baa2 NF |
1513 | tasklet_disable(&atchan->tasklet); |
1514 | ||
1515 | tasklet_kill(&atchan->tasklet); | |
1516 | list_del(&chan->device_node); | |
1517 | } | |
1518 | ||
1519 | clk_disable(atdma->clk); | |
1520 | clk_put(atdma->clk); | |
1521 | ||
1522 | iounmap(atdma->regs); | |
1523 | atdma->regs = NULL; | |
1524 | ||
1525 | io = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
114df7d6 | 1526 | release_mem_region(io->start, resource_size(io)); |
dc78baa2 NF |
1527 | |
1528 | kfree(atdma); | |
1529 | ||
1530 | return 0; | |
1531 | } | |
1532 | ||
1533 | static void at_dma_shutdown(struct platform_device *pdev) | |
1534 | { | |
1535 | struct at_dma *atdma = platform_get_drvdata(pdev); | |
1536 | ||
1537 | at_dma_off(platform_get_drvdata(pdev)); | |
1538 | clk_disable(atdma->clk); | |
1539 | } | |
1540 | ||
c0ba5947 NF |
1541 | static int at_dma_prepare(struct device *dev) |
1542 | { | |
1543 | struct platform_device *pdev = to_platform_device(dev); | |
1544 | struct at_dma *atdma = platform_get_drvdata(pdev); | |
1545 | struct dma_chan *chan, *_chan; | |
1546 | ||
1547 | list_for_each_entry_safe(chan, _chan, &atdma->dma_common.channels, | |
1548 | device_node) { | |
1549 | struct at_dma_chan *atchan = to_at_dma_chan(chan); | |
1550 | /* wait for transaction completion (except in cyclic case) */ | |
3c477482 | 1551 | if (atc_chan_is_enabled(atchan) && !atc_chan_is_cyclic(atchan)) |
c0ba5947 NF |
1552 | return -EAGAIN; |
1553 | } | |
1554 | return 0; | |
1555 | } | |
1556 | ||
1557 | static void atc_suspend_cyclic(struct at_dma_chan *atchan) | |
1558 | { | |
1559 | struct dma_chan *chan = &atchan->chan_common; | |
1560 | ||
1561 | /* Channel should be paused by user | |
1562 | * do it anyway even if it is not done already */ | |
3c477482 | 1563 | if (!atc_chan_is_paused(atchan)) { |
c0ba5947 NF |
1564 | dev_warn(chan2dev(chan), |
1565 | "cyclic channel not paused, should be done by channel user\n"); | |
1566 | atc_control(chan, DMA_PAUSE, 0); | |
1567 | } | |
1568 | ||
1569 | /* now preserve additional data for cyclic operations */ | |
1570 | /* next descriptor address in the cyclic list */ | |
1571 | atchan->save_dscr = channel_readl(atchan, DSCR); | |
1572 | ||
1573 | vdbg_dump_regs(atchan); | |
1574 | } | |
1575 | ||
33f82d14 | 1576 | static int at_dma_suspend_noirq(struct device *dev) |
dc78baa2 | 1577 | { |
33f82d14 DW |
1578 | struct platform_device *pdev = to_platform_device(dev); |
1579 | struct at_dma *atdma = platform_get_drvdata(pdev); | |
c0ba5947 | 1580 | struct dma_chan *chan, *_chan; |
dc78baa2 | 1581 | |
c0ba5947 NF |
1582 | /* preserve data */ |
1583 | list_for_each_entry_safe(chan, _chan, &atdma->dma_common.channels, | |
1584 | device_node) { | |
1585 | struct at_dma_chan *atchan = to_at_dma_chan(chan); | |
1586 | ||
3c477482 | 1587 | if (atc_chan_is_cyclic(atchan)) |
c0ba5947 NF |
1588 | atc_suspend_cyclic(atchan); |
1589 | atchan->save_cfg = channel_readl(atchan, CFG); | |
1590 | } | |
1591 | atdma->save_imr = dma_readl(atdma, EBCIMR); | |
1592 | ||
1593 | /* disable DMA controller */ | |
1594 | at_dma_off(atdma); | |
dc78baa2 NF |
1595 | clk_disable(atdma->clk); |
1596 | return 0; | |
1597 | } | |
1598 | ||
c0ba5947 NF |
1599 | static void atc_resume_cyclic(struct at_dma_chan *atchan) |
1600 | { | |
1601 | struct at_dma *atdma = to_at_dma(atchan->chan_common.device); | |
1602 | ||
1603 | /* restore channel status for cyclic descriptors list: | |
1604 | * next descriptor in the cyclic list at the time of suspend */ | |
1605 | channel_writel(atchan, SADDR, 0); | |
1606 | channel_writel(atchan, DADDR, 0); | |
1607 | channel_writel(atchan, CTRLA, 0); | |
1608 | channel_writel(atchan, CTRLB, 0); | |
1609 | channel_writel(atchan, DSCR, atchan->save_dscr); | |
1610 | dma_writel(atdma, CHER, atchan->mask); | |
1611 | ||
1612 | /* channel pause status should be removed by channel user | |
1613 | * We cannot take the initiative to do it here */ | |
1614 | ||
1615 | vdbg_dump_regs(atchan); | |
1616 | } | |
1617 | ||
33f82d14 | 1618 | static int at_dma_resume_noirq(struct device *dev) |
dc78baa2 | 1619 | { |
33f82d14 DW |
1620 | struct platform_device *pdev = to_platform_device(dev); |
1621 | struct at_dma *atdma = platform_get_drvdata(pdev); | |
c0ba5947 | 1622 | struct dma_chan *chan, *_chan; |
dc78baa2 | 1623 | |
c0ba5947 | 1624 | /* bring back DMA controller */ |
dc78baa2 NF |
1625 | clk_enable(atdma->clk); |
1626 | dma_writel(atdma, EN, AT_DMA_ENABLE); | |
c0ba5947 NF |
1627 | |
1628 | /* clear any pending interrupt */ | |
1629 | while (dma_readl(atdma, EBCISR)) | |
1630 | cpu_relax(); | |
1631 | ||
1632 | /* restore saved data */ | |
1633 | dma_writel(atdma, EBCIER, atdma->save_imr); | |
1634 | list_for_each_entry_safe(chan, _chan, &atdma->dma_common.channels, | |
1635 | device_node) { | |
1636 | struct at_dma_chan *atchan = to_at_dma_chan(chan); | |
1637 | ||
1638 | channel_writel(atchan, CFG, atchan->save_cfg); | |
3c477482 | 1639 | if (atc_chan_is_cyclic(atchan)) |
c0ba5947 NF |
1640 | atc_resume_cyclic(atchan); |
1641 | } | |
dc78baa2 | 1642 | return 0; |
dc78baa2 NF |
1643 | } |
1644 | ||
47145210 | 1645 | static const struct dev_pm_ops at_dma_dev_pm_ops = { |
c0ba5947 | 1646 | .prepare = at_dma_prepare, |
33f82d14 DW |
1647 | .suspend_noirq = at_dma_suspend_noirq, |
1648 | .resume_noirq = at_dma_resume_noirq, | |
1649 | }; | |
1650 | ||
dc78baa2 | 1651 | static struct platform_driver at_dma_driver = { |
1d1bbd30 | 1652 | .remove = at_dma_remove, |
dc78baa2 | 1653 | .shutdown = at_dma_shutdown, |
67348450 | 1654 | .id_table = atdma_devtypes, |
dc78baa2 NF |
1655 | .driver = { |
1656 | .name = "at_hdmac", | |
33f82d14 | 1657 | .pm = &at_dma_dev_pm_ops, |
c5115953 | 1658 | .of_match_table = of_match_ptr(atmel_dma_dt_ids), |
dc78baa2 NF |
1659 | }, |
1660 | }; | |
1661 | ||
1662 | static int __init at_dma_init(void) | |
1663 | { | |
1664 | return platform_driver_probe(&at_dma_driver, at_dma_probe); | |
1665 | } | |
93d0bec2 | 1666 | subsys_initcall(at_dma_init); |
dc78baa2 NF |
1667 | |
1668 | static void __exit at_dma_exit(void) | |
1669 | { | |
1670 | platform_driver_unregister(&at_dma_driver); | |
1671 | } | |
1672 | module_exit(at_dma_exit); | |
1673 | ||
1674 | MODULE_DESCRIPTION("Atmel AHB DMA Controller driver"); | |
1675 | MODULE_AUTHOR("Nicolas Ferre <nicolas.ferre@atmel.com>"); | |
1676 | MODULE_LICENSE("GPL"); | |
1677 | MODULE_ALIAS("platform:at_hdmac"); |