Commit | Line | Data |
---|---|---|
3bfb1d20 | 1 | /* |
b801479b | 2 | * Core driver for the Synopsys DesignWare DMA Controller |
3bfb1d20 HS |
3 | * |
4 | * Copyright (C) 2007-2008 Atmel Corporation | |
aecb7b64 | 5 | * Copyright (C) 2010-2011 ST Microelectronics |
3bfb1d20 HS |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
b801479b | 11 | |
327e6970 | 12 | #include <linux/bitops.h> |
3bfb1d20 HS |
13 | #include <linux/clk.h> |
14 | #include <linux/delay.h> | |
15 | #include <linux/dmaengine.h> | |
16 | #include <linux/dma-mapping.h> | |
17 | #include <linux/init.h> | |
18 | #include <linux/interrupt.h> | |
19 | #include <linux/io.h> | |
d3f797d9 | 20 | #include <linux/of.h> |
3bfb1d20 HS |
21 | #include <linux/mm.h> |
22 | #include <linux/module.h> | |
23 | #include <linux/platform_device.h> | |
24 | #include <linux/slab.h> | |
25 | ||
26 | #include "dw_dmac_regs.h" | |
d2ebfb33 | 27 | #include "dmaengine.h" |
3bfb1d20 HS |
28 | |
29 | /* | |
30 | * This supports the Synopsys "DesignWare AHB Central DMA Controller", | |
31 | * (DW_ahb_dmac) which is used with various AMBA 2.0 systems (not all | |
32 | * of which use ARM any more). See the "Databook" from Synopsys for | |
33 | * information beyond what licensees probably provide. | |
34 | * | |
35 | * The driver has currently been tested only with the Atmel AT32AP7000, | |
36 | * which does not support descriptor writeback. | |
37 | */ | |
38 | ||
a0982004 AS |
39 | static inline unsigned int dwc_get_dms(struct dw_dma_slave *slave) |
40 | { | |
41 | return slave ? slave->dst_master : 0; | |
42 | } | |
43 | ||
44 | static inline unsigned int dwc_get_sms(struct dw_dma_slave *slave) | |
45 | { | |
46 | return slave ? slave->src_master : 1; | |
47 | } | |
48 | ||
327e6970 VK |
49 | #define DWC_DEFAULT_CTLLO(_chan) ({ \ |
50 | struct dw_dma_slave *__slave = (_chan->private); \ | |
51 | struct dw_dma_chan *_dwc = to_dw_dma_chan(_chan); \ | |
52 | struct dma_slave_config *_sconfig = &_dwc->dma_sconfig; \ | |
495aea4b | 53 | bool _is_slave = is_slave_direction(_dwc->direction); \ |
a0982004 AS |
54 | int _dms = dwc_get_dms(__slave); \ |
55 | int _sms = dwc_get_sms(__slave); \ | |
495aea4b | 56 | u8 _smsize = _is_slave ? _sconfig->src_maxburst : \ |
327e6970 | 57 | DW_DMA_MSIZE_16; \ |
495aea4b | 58 | u8 _dmsize = _is_slave ? _sconfig->dst_maxburst : \ |
327e6970 | 59 | DW_DMA_MSIZE_16; \ |
f301c062 | 60 | \ |
327e6970 VK |
61 | (DWC_CTLL_DST_MSIZE(_dmsize) \ |
62 | | DWC_CTLL_SRC_MSIZE(_smsize) \ | |
f301c062 JI |
63 | | DWC_CTLL_LLP_D_EN \ |
64 | | DWC_CTLL_LLP_S_EN \ | |
327e6970 VK |
65 | | DWC_CTLL_DMS(_dms) \ |
66 | | DWC_CTLL_SMS(_sms)); \ | |
f301c062 | 67 | }) |
3bfb1d20 | 68 | |
3bfb1d20 HS |
69 | /* |
70 | * Number of descriptors to allocate for each channel. This should be | |
71 | * made configurable somehow; preferably, the clients (at least the | |
72 | * ones using slave transfers) should be able to give us a hint. | |
73 | */ | |
74 | #define NR_DESCS_PER_CHANNEL 64 | |
75 | ||
23d5f4ec AS |
76 | #define SRC_MASTER 0 |
77 | #define DST_MASTER 1 | |
78 | ||
79 | static inline unsigned int dwc_get_data_width(struct dma_chan *chan, int master) | |
80 | { | |
81 | struct dw_dma *dw = to_dw_dma(chan->device); | |
82 | struct dw_dma_slave *dws = chan->private; | |
83 | ||
84 | if (master == SRC_MASTER) | |
85 | return dw->data_width[dwc_get_sms(dws)]; | |
86 | else if (master == DST_MASTER) | |
87 | return dw->data_width[dwc_get_dms(dws)]; | |
88 | ||
89 | return 0; | |
90 | } | |
91 | ||
3bfb1d20 HS |
92 | /*----------------------------------------------------------------------*/ |
93 | ||
94 | /* | |
95 | * Because we're not relying on writeback from the controller (it may not | |
96 | * even be configured into the core!) we don't need to use dma_pool. These | |
97 | * descriptors -- and associated data -- are cacheable. We do need to make | |
98 | * sure their dcache entries are written back before handing them off to | |
99 | * the controller, though. | |
100 | */ | |
101 | ||
41d5e59c DW |
102 | static struct device *chan2dev(struct dma_chan *chan) |
103 | { | |
104 | return &chan->dev->device; | |
105 | } | |
106 | static struct device *chan2parent(struct dma_chan *chan) | |
107 | { | |
108 | return chan->dev->device.parent; | |
109 | } | |
110 | ||
3bfb1d20 HS |
111 | static struct dw_desc *dwc_first_active(struct dw_dma_chan *dwc) |
112 | { | |
e63a47a3 | 113 | return to_dw_desc(dwc->active_list.next); |
3bfb1d20 HS |
114 | } |
115 | ||
3bfb1d20 HS |
116 | static struct dw_desc *dwc_desc_get(struct dw_dma_chan *dwc) |
117 | { | |
118 | struct dw_desc *desc, *_desc; | |
119 | struct dw_desc *ret = NULL; | |
120 | unsigned int i = 0; | |
69cea5a0 | 121 | unsigned long flags; |
3bfb1d20 | 122 | |
69cea5a0 | 123 | spin_lock_irqsave(&dwc->lock, flags); |
3bfb1d20 | 124 | list_for_each_entry_safe(desc, _desc, &dwc->free_list, desc_node) { |
2ab37276 | 125 | i++; |
3bfb1d20 HS |
126 | if (async_tx_test_ack(&desc->txd)) { |
127 | list_del(&desc->desc_node); | |
128 | ret = desc; | |
129 | break; | |
130 | } | |
41d5e59c | 131 | dev_dbg(chan2dev(&dwc->chan), "desc %p not ACKed\n", desc); |
3bfb1d20 | 132 | } |
69cea5a0 | 133 | spin_unlock_irqrestore(&dwc->lock, flags); |
3bfb1d20 | 134 | |
41d5e59c | 135 | dev_vdbg(chan2dev(&dwc->chan), "scanned %u descriptors on freelist\n", i); |
3bfb1d20 HS |
136 | |
137 | return ret; | |
138 | } | |
139 | ||
140 | static void dwc_sync_desc_for_cpu(struct dw_dma_chan *dwc, struct dw_desc *desc) | |
141 | { | |
142 | struct dw_desc *child; | |
143 | ||
e0bd0f8c | 144 | list_for_each_entry(child, &desc->tx_list, desc_node) |
41d5e59c | 145 | dma_sync_single_for_cpu(chan2parent(&dwc->chan), |
3bfb1d20 HS |
146 | child->txd.phys, sizeof(child->lli), |
147 | DMA_TO_DEVICE); | |
41d5e59c | 148 | dma_sync_single_for_cpu(chan2parent(&dwc->chan), |
3bfb1d20 HS |
149 | desc->txd.phys, sizeof(desc->lli), |
150 | DMA_TO_DEVICE); | |
151 | } | |
152 | ||
153 | /* | |
154 | * Move a descriptor, including any children, to the free list. | |
155 | * `desc' must not be on any lists. | |
156 | */ | |
157 | static void dwc_desc_put(struct dw_dma_chan *dwc, struct dw_desc *desc) | |
158 | { | |
69cea5a0 VK |
159 | unsigned long flags; |
160 | ||
3bfb1d20 HS |
161 | if (desc) { |
162 | struct dw_desc *child; | |
163 | ||
164 | dwc_sync_desc_for_cpu(dwc, desc); | |
165 | ||
69cea5a0 | 166 | spin_lock_irqsave(&dwc->lock, flags); |
e0bd0f8c | 167 | list_for_each_entry(child, &desc->tx_list, desc_node) |
41d5e59c | 168 | dev_vdbg(chan2dev(&dwc->chan), |
3bfb1d20 HS |
169 | "moving child desc %p to freelist\n", |
170 | child); | |
e0bd0f8c | 171 | list_splice_init(&desc->tx_list, &dwc->free_list); |
41d5e59c | 172 | dev_vdbg(chan2dev(&dwc->chan), "moving desc %p to freelist\n", desc); |
3bfb1d20 | 173 | list_add(&desc->desc_node, &dwc->free_list); |
69cea5a0 | 174 | spin_unlock_irqrestore(&dwc->lock, flags); |
3bfb1d20 HS |
175 | } |
176 | } | |
177 | ||
61e183f8 VK |
178 | static void dwc_initialize(struct dw_dma_chan *dwc) |
179 | { | |
180 | struct dw_dma *dw = to_dw_dma(dwc->chan.device); | |
181 | struct dw_dma_slave *dws = dwc->chan.private; | |
182 | u32 cfghi = DWC_CFGH_FIFO_MODE; | |
183 | u32 cfglo = DWC_CFGL_CH_PRIOR(dwc->priority); | |
184 | ||
185 | if (dwc->initialized == true) | |
186 | return; | |
187 | ||
188 | if (dws) { | |
189 | /* | |
190 | * We need controller-specific data to set up slave | |
191 | * transfers. | |
192 | */ | |
193 | BUG_ON(!dws->dma_dev || dws->dma_dev != dw->dma.dev); | |
194 | ||
195 | cfghi = dws->cfg_hi; | |
196 | cfglo |= dws->cfg_lo & ~DWC_CFGL_CH_PRIOR_MASK; | |
8fccc5bf | 197 | } else { |
0fdb567f | 198 | if (dwc->direction == DMA_MEM_TO_DEV) |
8fccc5bf | 199 | cfghi = DWC_CFGH_DST_PER(dwc->dma_sconfig.slave_id); |
0fdb567f | 200 | else if (dwc->direction == DMA_DEV_TO_MEM) |
8fccc5bf | 201 | cfghi = DWC_CFGH_SRC_PER(dwc->dma_sconfig.slave_id); |
61e183f8 VK |
202 | } |
203 | ||
204 | channel_writel(dwc, CFG_LO, cfglo); | |
205 | channel_writel(dwc, CFG_HI, cfghi); | |
206 | ||
207 | /* Enable interrupts */ | |
208 | channel_set_bit(dw, MASK.XFER, dwc->mask); | |
61e183f8 VK |
209 | channel_set_bit(dw, MASK.ERROR, dwc->mask); |
210 | ||
211 | dwc->initialized = true; | |
212 | } | |
213 | ||
3bfb1d20 HS |
214 | /*----------------------------------------------------------------------*/ |
215 | ||
4c2d56c5 AS |
216 | static inline unsigned int dwc_fast_fls(unsigned long long v) |
217 | { | |
218 | /* | |
219 | * We can be a lot more clever here, but this should take care | |
220 | * of the most common optimization. | |
221 | */ | |
222 | if (!(v & 7)) | |
223 | return 3; | |
224 | else if (!(v & 3)) | |
225 | return 2; | |
226 | else if (!(v & 1)) | |
227 | return 1; | |
228 | return 0; | |
229 | } | |
230 | ||
f52b36d2 | 231 | static inline void dwc_dump_chan_regs(struct dw_dma_chan *dwc) |
1d455437 AS |
232 | { |
233 | dev_err(chan2dev(&dwc->chan), | |
234 | " SAR: 0x%x DAR: 0x%x LLP: 0x%x CTL: 0x%x:%08x\n", | |
235 | channel_readl(dwc, SAR), | |
236 | channel_readl(dwc, DAR), | |
237 | channel_readl(dwc, LLP), | |
238 | channel_readl(dwc, CTL_HI), | |
239 | channel_readl(dwc, CTL_LO)); | |
240 | } | |
241 | ||
3f936207 AS |
242 | static inline void dwc_chan_disable(struct dw_dma *dw, struct dw_dma_chan *dwc) |
243 | { | |
244 | channel_clear_bit(dw, CH_EN, dwc->mask); | |
245 | while (dma_readl(dw, CH_EN) & dwc->mask) | |
246 | cpu_relax(); | |
247 | } | |
248 | ||
1d455437 AS |
249 | /*----------------------------------------------------------------------*/ |
250 | ||
fed2574b AS |
251 | /* Perform single block transfer */ |
252 | static inline void dwc_do_single_block(struct dw_dma_chan *dwc, | |
253 | struct dw_desc *desc) | |
254 | { | |
255 | struct dw_dma *dw = to_dw_dma(dwc->chan.device); | |
256 | u32 ctllo; | |
257 | ||
258 | /* Software emulation of LLP mode relies on interrupts to continue | |
259 | * multi block transfer. */ | |
260 | ctllo = desc->lli.ctllo | DWC_CTLL_INT_EN; | |
261 | ||
262 | channel_writel(dwc, SAR, desc->lli.sar); | |
263 | channel_writel(dwc, DAR, desc->lli.dar); | |
264 | channel_writel(dwc, CTL_LO, ctllo); | |
265 | channel_writel(dwc, CTL_HI, desc->lli.ctlhi); | |
266 | channel_set_bit(dw, CH_EN, dwc->mask); | |
f5c6a7df AS |
267 | |
268 | /* Move pointer to next descriptor */ | |
269 | dwc->tx_node_active = dwc->tx_node_active->next; | |
fed2574b AS |
270 | } |
271 | ||
3bfb1d20 HS |
272 | /* Called with dwc->lock held and bh disabled */ |
273 | static void dwc_dostart(struct dw_dma_chan *dwc, struct dw_desc *first) | |
274 | { | |
275 | struct dw_dma *dw = to_dw_dma(dwc->chan.device); | |
fed2574b | 276 | unsigned long was_soft_llp; |
3bfb1d20 HS |
277 | |
278 | /* ASSERT: channel is idle */ | |
279 | if (dma_readl(dw, CH_EN) & dwc->mask) { | |
41d5e59c | 280 | dev_err(chan2dev(&dwc->chan), |
3bfb1d20 | 281 | "BUG: Attempted to start non-idle channel\n"); |
1d455437 | 282 | dwc_dump_chan_regs(dwc); |
3bfb1d20 HS |
283 | |
284 | /* The tasklet will hopefully advance the queue... */ | |
285 | return; | |
286 | } | |
287 | ||
fed2574b AS |
288 | if (dwc->nollp) { |
289 | was_soft_llp = test_and_set_bit(DW_DMA_IS_SOFT_LLP, | |
290 | &dwc->flags); | |
291 | if (was_soft_llp) { | |
292 | dev_err(chan2dev(&dwc->chan), | |
293 | "BUG: Attempted to start new LLP transfer " | |
294 | "inside ongoing one\n"); | |
295 | return; | |
296 | } | |
297 | ||
298 | dwc_initialize(dwc); | |
299 | ||
300 | dwc->tx_list = &first->tx_list; | |
f5c6a7df | 301 | dwc->tx_node_active = &first->tx_list; |
fed2574b AS |
302 | |
303 | dwc_do_single_block(dwc, first); | |
304 | ||
305 | return; | |
306 | } | |
307 | ||
61e183f8 VK |
308 | dwc_initialize(dwc); |
309 | ||
3bfb1d20 HS |
310 | channel_writel(dwc, LLP, first->txd.phys); |
311 | channel_writel(dwc, CTL_LO, | |
312 | DWC_CTLL_LLP_D_EN | DWC_CTLL_LLP_S_EN); | |
313 | channel_writel(dwc, CTL_HI, 0); | |
314 | channel_set_bit(dw, CH_EN, dwc->mask); | |
315 | } | |
316 | ||
317 | /*----------------------------------------------------------------------*/ | |
318 | ||
319 | static void | |
5fedefb8 VK |
320 | dwc_descriptor_complete(struct dw_dma_chan *dwc, struct dw_desc *desc, |
321 | bool callback_required) | |
3bfb1d20 | 322 | { |
5fedefb8 VK |
323 | dma_async_tx_callback callback = NULL; |
324 | void *param = NULL; | |
3bfb1d20 | 325 | struct dma_async_tx_descriptor *txd = &desc->txd; |
e518076e | 326 | struct dw_desc *child; |
69cea5a0 | 327 | unsigned long flags; |
3bfb1d20 | 328 | |
41d5e59c | 329 | dev_vdbg(chan2dev(&dwc->chan), "descriptor %u complete\n", txd->cookie); |
3bfb1d20 | 330 | |
69cea5a0 | 331 | spin_lock_irqsave(&dwc->lock, flags); |
f7fbce07 | 332 | dma_cookie_complete(txd); |
5fedefb8 VK |
333 | if (callback_required) { |
334 | callback = txd->callback; | |
335 | param = txd->callback_param; | |
336 | } | |
3bfb1d20 HS |
337 | |
338 | dwc_sync_desc_for_cpu(dwc, desc); | |
e518076e VK |
339 | |
340 | /* async_tx_ack */ | |
341 | list_for_each_entry(child, &desc->tx_list, desc_node) | |
342 | async_tx_ack(&child->txd); | |
343 | async_tx_ack(&desc->txd); | |
344 | ||
e0bd0f8c | 345 | list_splice_init(&desc->tx_list, &dwc->free_list); |
3bfb1d20 HS |
346 | list_move(&desc->desc_node, &dwc->free_list); |
347 | ||
495aea4b | 348 | if (!is_slave_direction(dwc->direction)) { |
657a77fa AN |
349 | struct device *parent = chan2parent(&dwc->chan); |
350 | if (!(txd->flags & DMA_COMPL_SKIP_DEST_UNMAP)) { | |
351 | if (txd->flags & DMA_COMPL_DEST_UNMAP_SINGLE) | |
352 | dma_unmap_single(parent, desc->lli.dar, | |
353 | desc->len, DMA_FROM_DEVICE); | |
354 | else | |
355 | dma_unmap_page(parent, desc->lli.dar, | |
356 | desc->len, DMA_FROM_DEVICE); | |
357 | } | |
358 | if (!(txd->flags & DMA_COMPL_SKIP_SRC_UNMAP)) { | |
359 | if (txd->flags & DMA_COMPL_SRC_UNMAP_SINGLE) | |
360 | dma_unmap_single(parent, desc->lli.sar, | |
361 | desc->len, DMA_TO_DEVICE); | |
362 | else | |
363 | dma_unmap_page(parent, desc->lli.sar, | |
364 | desc->len, DMA_TO_DEVICE); | |
365 | } | |
366 | } | |
3bfb1d20 | 367 | |
69cea5a0 VK |
368 | spin_unlock_irqrestore(&dwc->lock, flags); |
369 | ||
21e93c1e | 370 | if (callback) |
3bfb1d20 HS |
371 | callback(param); |
372 | } | |
373 | ||
374 | static void dwc_complete_all(struct dw_dma *dw, struct dw_dma_chan *dwc) | |
375 | { | |
376 | struct dw_desc *desc, *_desc; | |
377 | LIST_HEAD(list); | |
69cea5a0 | 378 | unsigned long flags; |
3bfb1d20 | 379 | |
69cea5a0 | 380 | spin_lock_irqsave(&dwc->lock, flags); |
3bfb1d20 | 381 | if (dma_readl(dw, CH_EN) & dwc->mask) { |
41d5e59c | 382 | dev_err(chan2dev(&dwc->chan), |
3bfb1d20 HS |
383 | "BUG: XFER bit set, but channel not idle!\n"); |
384 | ||
385 | /* Try to continue after resetting the channel... */ | |
3f936207 | 386 | dwc_chan_disable(dw, dwc); |
3bfb1d20 HS |
387 | } |
388 | ||
389 | /* | |
390 | * Submit queued descriptors ASAP, i.e. before we go through | |
391 | * the completed ones. | |
392 | */ | |
3bfb1d20 | 393 | list_splice_init(&dwc->active_list, &list); |
f336e42f VK |
394 | if (!list_empty(&dwc->queue)) { |
395 | list_move(dwc->queue.next, &dwc->active_list); | |
396 | dwc_dostart(dwc, dwc_first_active(dwc)); | |
397 | } | |
3bfb1d20 | 398 | |
69cea5a0 VK |
399 | spin_unlock_irqrestore(&dwc->lock, flags); |
400 | ||
3bfb1d20 | 401 | list_for_each_entry_safe(desc, _desc, &list, desc_node) |
5fedefb8 | 402 | dwc_descriptor_complete(dwc, desc, true); |
3bfb1d20 HS |
403 | } |
404 | ||
405 | static void dwc_scan_descriptors(struct dw_dma *dw, struct dw_dma_chan *dwc) | |
406 | { | |
407 | dma_addr_t llp; | |
408 | struct dw_desc *desc, *_desc; | |
409 | struct dw_desc *child; | |
410 | u32 status_xfer; | |
69cea5a0 | 411 | unsigned long flags; |
3bfb1d20 | 412 | |
69cea5a0 | 413 | spin_lock_irqsave(&dwc->lock, flags); |
3bfb1d20 HS |
414 | llp = channel_readl(dwc, LLP); |
415 | status_xfer = dma_readl(dw, RAW.XFER); | |
416 | ||
417 | if (status_xfer & dwc->mask) { | |
418 | /* Everything we've submitted is done */ | |
419 | dma_writel(dw, CLEAR.XFER, dwc->mask); | |
69cea5a0 VK |
420 | spin_unlock_irqrestore(&dwc->lock, flags); |
421 | ||
3bfb1d20 HS |
422 | dwc_complete_all(dw, dwc); |
423 | return; | |
424 | } | |
425 | ||
69cea5a0 VK |
426 | if (list_empty(&dwc->active_list)) { |
427 | spin_unlock_irqrestore(&dwc->lock, flags); | |
087809fc | 428 | return; |
69cea5a0 | 429 | } |
087809fc | 430 | |
2e4c364e | 431 | dev_vdbg(chan2dev(&dwc->chan), "%s: llp=0x%llx\n", __func__, |
2f45d613 | 432 | (unsigned long long)llp); |
3bfb1d20 HS |
433 | |
434 | list_for_each_entry_safe(desc, _desc, &dwc->active_list, desc_node) { | |
84adccfb | 435 | /* check first descriptors addr */ |
69cea5a0 VK |
436 | if (desc->txd.phys == llp) { |
437 | spin_unlock_irqrestore(&dwc->lock, flags); | |
84adccfb | 438 | return; |
69cea5a0 | 439 | } |
84adccfb VK |
440 | |
441 | /* check first descriptors llp */ | |
69cea5a0 | 442 | if (desc->lli.llp == llp) { |
3bfb1d20 | 443 | /* This one is currently in progress */ |
69cea5a0 | 444 | spin_unlock_irqrestore(&dwc->lock, flags); |
3bfb1d20 | 445 | return; |
69cea5a0 | 446 | } |
3bfb1d20 | 447 | |
e0bd0f8c | 448 | list_for_each_entry(child, &desc->tx_list, desc_node) |
69cea5a0 | 449 | if (child->lli.llp == llp) { |
3bfb1d20 | 450 | /* Currently in progress */ |
69cea5a0 | 451 | spin_unlock_irqrestore(&dwc->lock, flags); |
3bfb1d20 | 452 | return; |
69cea5a0 | 453 | } |
3bfb1d20 HS |
454 | |
455 | /* | |
456 | * No descriptors so far seem to be in progress, i.e. | |
457 | * this one must be done. | |
458 | */ | |
69cea5a0 | 459 | spin_unlock_irqrestore(&dwc->lock, flags); |
5fedefb8 | 460 | dwc_descriptor_complete(dwc, desc, true); |
69cea5a0 | 461 | spin_lock_irqsave(&dwc->lock, flags); |
3bfb1d20 HS |
462 | } |
463 | ||
41d5e59c | 464 | dev_err(chan2dev(&dwc->chan), |
3bfb1d20 HS |
465 | "BUG: All descriptors done, but channel not idle!\n"); |
466 | ||
467 | /* Try to continue after resetting the channel... */ | |
3f936207 | 468 | dwc_chan_disable(dw, dwc); |
3bfb1d20 HS |
469 | |
470 | if (!list_empty(&dwc->queue)) { | |
f336e42f VK |
471 | list_move(dwc->queue.next, &dwc->active_list); |
472 | dwc_dostart(dwc, dwc_first_active(dwc)); | |
3bfb1d20 | 473 | } |
69cea5a0 | 474 | spin_unlock_irqrestore(&dwc->lock, flags); |
3bfb1d20 HS |
475 | } |
476 | ||
93aad1bc | 477 | static inline void dwc_dump_lli(struct dw_dma_chan *dwc, struct dw_lli *lli) |
3bfb1d20 | 478 | { |
21d43f49 AS |
479 | dev_crit(chan2dev(&dwc->chan), " desc: s0x%x d0x%x l0x%x c0x%x:%x\n", |
480 | lli->sar, lli->dar, lli->llp, lli->ctlhi, lli->ctllo); | |
3bfb1d20 HS |
481 | } |
482 | ||
483 | static void dwc_handle_error(struct dw_dma *dw, struct dw_dma_chan *dwc) | |
484 | { | |
485 | struct dw_desc *bad_desc; | |
486 | struct dw_desc *child; | |
69cea5a0 | 487 | unsigned long flags; |
3bfb1d20 HS |
488 | |
489 | dwc_scan_descriptors(dw, dwc); | |
490 | ||
69cea5a0 VK |
491 | spin_lock_irqsave(&dwc->lock, flags); |
492 | ||
3bfb1d20 HS |
493 | /* |
494 | * The descriptor currently at the head of the active list is | |
495 | * borked. Since we don't have any way to report errors, we'll | |
496 | * just have to scream loudly and try to carry on. | |
497 | */ | |
498 | bad_desc = dwc_first_active(dwc); | |
499 | list_del_init(&bad_desc->desc_node); | |
f336e42f | 500 | list_move(dwc->queue.next, dwc->active_list.prev); |
3bfb1d20 HS |
501 | |
502 | /* Clear the error flag and try to restart the controller */ | |
503 | dma_writel(dw, CLEAR.ERROR, dwc->mask); | |
504 | if (!list_empty(&dwc->active_list)) | |
505 | dwc_dostart(dwc, dwc_first_active(dwc)); | |
506 | ||
507 | /* | |
ba84bd71 | 508 | * WARN may seem harsh, but since this only happens |
3bfb1d20 HS |
509 | * when someone submits a bad physical address in a |
510 | * descriptor, we should consider ourselves lucky that the | |
511 | * controller flagged an error instead of scribbling over | |
512 | * random memory locations. | |
513 | */ | |
ba84bd71 AS |
514 | dev_WARN(chan2dev(&dwc->chan), "Bad descriptor submitted for DMA!\n" |
515 | " cookie: %d\n", bad_desc->txd.cookie); | |
3bfb1d20 | 516 | dwc_dump_lli(dwc, &bad_desc->lli); |
e0bd0f8c | 517 | list_for_each_entry(child, &bad_desc->tx_list, desc_node) |
3bfb1d20 HS |
518 | dwc_dump_lli(dwc, &child->lli); |
519 | ||
69cea5a0 VK |
520 | spin_unlock_irqrestore(&dwc->lock, flags); |
521 | ||
3bfb1d20 | 522 | /* Pretend the descriptor completed successfully */ |
5fedefb8 | 523 | dwc_descriptor_complete(dwc, bad_desc, true); |
3bfb1d20 HS |
524 | } |
525 | ||
d9de4519 HCE |
526 | /* --------------------- Cyclic DMA API extensions -------------------- */ |
527 | ||
528 | inline dma_addr_t dw_dma_get_src_addr(struct dma_chan *chan) | |
529 | { | |
530 | struct dw_dma_chan *dwc = to_dw_dma_chan(chan); | |
531 | return channel_readl(dwc, SAR); | |
532 | } | |
533 | EXPORT_SYMBOL(dw_dma_get_src_addr); | |
534 | ||
535 | inline dma_addr_t dw_dma_get_dst_addr(struct dma_chan *chan) | |
536 | { | |
537 | struct dw_dma_chan *dwc = to_dw_dma_chan(chan); | |
538 | return channel_readl(dwc, DAR); | |
539 | } | |
540 | EXPORT_SYMBOL(dw_dma_get_dst_addr); | |
541 | ||
542 | /* called with dwc->lock held and all DMAC interrupts disabled */ | |
543 | static void dwc_handle_cyclic(struct dw_dma *dw, struct dw_dma_chan *dwc, | |
ff7b05f2 | 544 | u32 status_err, u32 status_xfer) |
d9de4519 | 545 | { |
69cea5a0 VK |
546 | unsigned long flags; |
547 | ||
ff7b05f2 | 548 | if (dwc->mask) { |
d9de4519 HCE |
549 | void (*callback)(void *param); |
550 | void *callback_param; | |
551 | ||
552 | dev_vdbg(chan2dev(&dwc->chan), "new cyclic period llp 0x%08x\n", | |
553 | channel_readl(dwc, LLP)); | |
d9de4519 HCE |
554 | |
555 | callback = dwc->cdesc->period_callback; | |
556 | callback_param = dwc->cdesc->period_callback_param; | |
69cea5a0 VK |
557 | |
558 | if (callback) | |
d9de4519 | 559 | callback(callback_param); |
d9de4519 HCE |
560 | } |
561 | ||
562 | /* | |
563 | * Error and transfer complete are highly unlikely, and will most | |
564 | * likely be due to a configuration error by the user. | |
565 | */ | |
566 | if (unlikely(status_err & dwc->mask) || | |
567 | unlikely(status_xfer & dwc->mask)) { | |
568 | int i; | |
569 | ||
570 | dev_err(chan2dev(&dwc->chan), "cyclic DMA unexpected %s " | |
571 | "interrupt, stopping DMA transfer\n", | |
572 | status_xfer ? "xfer" : "error"); | |
69cea5a0 VK |
573 | |
574 | spin_lock_irqsave(&dwc->lock, flags); | |
575 | ||
1d455437 | 576 | dwc_dump_chan_regs(dwc); |
d9de4519 | 577 | |
3f936207 | 578 | dwc_chan_disable(dw, dwc); |
d9de4519 HCE |
579 | |
580 | /* make sure DMA does not restart by loading a new list */ | |
581 | channel_writel(dwc, LLP, 0); | |
582 | channel_writel(dwc, CTL_LO, 0); | |
583 | channel_writel(dwc, CTL_HI, 0); | |
584 | ||
d9de4519 HCE |
585 | dma_writel(dw, CLEAR.ERROR, dwc->mask); |
586 | dma_writel(dw, CLEAR.XFER, dwc->mask); | |
587 | ||
588 | for (i = 0; i < dwc->cdesc->periods; i++) | |
589 | dwc_dump_lli(dwc, &dwc->cdesc->desc[i]->lli); | |
69cea5a0 VK |
590 | |
591 | spin_unlock_irqrestore(&dwc->lock, flags); | |
d9de4519 HCE |
592 | } |
593 | } | |
594 | ||
595 | /* ------------------------------------------------------------------------- */ | |
596 | ||
3bfb1d20 HS |
597 | static void dw_dma_tasklet(unsigned long data) |
598 | { | |
599 | struct dw_dma *dw = (struct dw_dma *)data; | |
600 | struct dw_dma_chan *dwc; | |
3bfb1d20 HS |
601 | u32 status_xfer; |
602 | u32 status_err; | |
603 | int i; | |
604 | ||
7fe7b2f4 | 605 | status_xfer = dma_readl(dw, RAW.XFER); |
3bfb1d20 HS |
606 | status_err = dma_readl(dw, RAW.ERROR); |
607 | ||
2e4c364e | 608 | dev_vdbg(dw->dma.dev, "%s: status_err=%x\n", __func__, status_err); |
3bfb1d20 HS |
609 | |
610 | for (i = 0; i < dw->dma.chancnt; i++) { | |
611 | dwc = &dw->chan[i]; | |
d9de4519 | 612 | if (test_bit(DW_DMA_IS_CYCLIC, &dwc->flags)) |
ff7b05f2 | 613 | dwc_handle_cyclic(dw, dwc, status_err, status_xfer); |
d9de4519 | 614 | else if (status_err & (1 << i)) |
3bfb1d20 | 615 | dwc_handle_error(dw, dwc); |
fed2574b AS |
616 | else if (status_xfer & (1 << i)) { |
617 | unsigned long flags; | |
618 | ||
619 | spin_lock_irqsave(&dwc->lock, flags); | |
620 | if (test_bit(DW_DMA_IS_SOFT_LLP, &dwc->flags)) { | |
621 | if (dwc->tx_node_active != dwc->tx_list) { | |
622 | struct dw_desc *desc = | |
e63a47a3 | 623 | to_dw_desc(dwc->tx_node_active); |
fed2574b AS |
624 | |
625 | dma_writel(dw, CLEAR.XFER, dwc->mask); | |
626 | ||
fed2574b AS |
627 | dwc_do_single_block(dwc, desc); |
628 | ||
629 | spin_unlock_irqrestore(&dwc->lock, flags); | |
630 | continue; | |
fed2574b | 631 | } |
f5c6a7df AS |
632 | /* we are done here */ |
633 | clear_bit(DW_DMA_IS_SOFT_LLP, &dwc->flags); | |
fed2574b AS |
634 | } |
635 | spin_unlock_irqrestore(&dwc->lock, flags); | |
636 | ||
3bfb1d20 | 637 | dwc_scan_descriptors(dw, dwc); |
fed2574b | 638 | } |
3bfb1d20 HS |
639 | } |
640 | ||
641 | /* | |
ff7b05f2 | 642 | * Re-enable interrupts. |
3bfb1d20 HS |
643 | */ |
644 | channel_set_bit(dw, MASK.XFER, dw->all_chan_mask); | |
3bfb1d20 HS |
645 | channel_set_bit(dw, MASK.ERROR, dw->all_chan_mask); |
646 | } | |
647 | ||
648 | static irqreturn_t dw_dma_interrupt(int irq, void *dev_id) | |
649 | { | |
650 | struct dw_dma *dw = dev_id; | |
651 | u32 status; | |
652 | ||
2e4c364e | 653 | dev_vdbg(dw->dma.dev, "%s: status=0x%x\n", __func__, |
3bfb1d20 HS |
654 | dma_readl(dw, STATUS_INT)); |
655 | ||
656 | /* | |
657 | * Just disable the interrupts. We'll turn them back on in the | |
658 | * softirq handler. | |
659 | */ | |
660 | channel_clear_bit(dw, MASK.XFER, dw->all_chan_mask); | |
3bfb1d20 HS |
661 | channel_clear_bit(dw, MASK.ERROR, dw->all_chan_mask); |
662 | ||
663 | status = dma_readl(dw, STATUS_INT); | |
664 | if (status) { | |
665 | dev_err(dw->dma.dev, | |
666 | "BUG: Unexpected interrupts pending: 0x%x\n", | |
667 | status); | |
668 | ||
669 | /* Try to recover */ | |
670 | channel_clear_bit(dw, MASK.XFER, (1 << 8) - 1); | |
3bfb1d20 HS |
671 | channel_clear_bit(dw, MASK.SRC_TRAN, (1 << 8) - 1); |
672 | channel_clear_bit(dw, MASK.DST_TRAN, (1 << 8) - 1); | |
673 | channel_clear_bit(dw, MASK.ERROR, (1 << 8) - 1); | |
674 | } | |
675 | ||
676 | tasklet_schedule(&dw->tasklet); | |
677 | ||
678 | return IRQ_HANDLED; | |
679 | } | |
680 | ||
681 | /*----------------------------------------------------------------------*/ | |
682 | ||
683 | static dma_cookie_t dwc_tx_submit(struct dma_async_tx_descriptor *tx) | |
684 | { | |
685 | struct dw_desc *desc = txd_to_dw_desc(tx); | |
686 | struct dw_dma_chan *dwc = to_dw_dma_chan(tx->chan); | |
687 | dma_cookie_t cookie; | |
69cea5a0 | 688 | unsigned long flags; |
3bfb1d20 | 689 | |
69cea5a0 | 690 | spin_lock_irqsave(&dwc->lock, flags); |
884485e1 | 691 | cookie = dma_cookie_assign(tx); |
3bfb1d20 HS |
692 | |
693 | /* | |
694 | * REVISIT: We should attempt to chain as many descriptors as | |
695 | * possible, perhaps even appending to those already submitted | |
696 | * for DMA. But this is hard to do in a race-free manner. | |
697 | */ | |
698 | if (list_empty(&dwc->active_list)) { | |
2e4c364e | 699 | dev_vdbg(chan2dev(tx->chan), "%s: started %u\n", __func__, |
3bfb1d20 | 700 | desc->txd.cookie); |
3bfb1d20 | 701 | list_add_tail(&desc->desc_node, &dwc->active_list); |
f336e42f | 702 | dwc_dostart(dwc, dwc_first_active(dwc)); |
3bfb1d20 | 703 | } else { |
2e4c364e | 704 | dev_vdbg(chan2dev(tx->chan), "%s: queued %u\n", __func__, |
3bfb1d20 HS |
705 | desc->txd.cookie); |
706 | ||
707 | list_add_tail(&desc->desc_node, &dwc->queue); | |
708 | } | |
709 | ||
69cea5a0 | 710 | spin_unlock_irqrestore(&dwc->lock, flags); |
3bfb1d20 HS |
711 | |
712 | return cookie; | |
713 | } | |
714 | ||
715 | static struct dma_async_tx_descriptor * | |
716 | dwc_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src, | |
717 | size_t len, unsigned long flags) | |
718 | { | |
719 | struct dw_dma_chan *dwc = to_dw_dma_chan(chan); | |
720 | struct dw_desc *desc; | |
721 | struct dw_desc *first; | |
722 | struct dw_desc *prev; | |
723 | size_t xfer_count; | |
724 | size_t offset; | |
725 | unsigned int src_width; | |
726 | unsigned int dst_width; | |
3d4f8605 | 727 | unsigned int data_width; |
3bfb1d20 HS |
728 | u32 ctllo; |
729 | ||
2f45d613 | 730 | dev_vdbg(chan2dev(chan), |
2e4c364e | 731 | "%s: d0x%llx s0x%llx l0x%zx f0x%lx\n", __func__, |
2f45d613 AS |
732 | (unsigned long long)dest, (unsigned long long)src, |
733 | len, flags); | |
3bfb1d20 HS |
734 | |
735 | if (unlikely(!len)) { | |
2e4c364e | 736 | dev_dbg(chan2dev(chan), "%s: length is zero!\n", __func__); |
3bfb1d20 HS |
737 | return NULL; |
738 | } | |
739 | ||
0fdb567f AS |
740 | dwc->direction = DMA_MEM_TO_MEM; |
741 | ||
23d5f4ec AS |
742 | data_width = min_t(unsigned int, dwc_get_data_width(chan, SRC_MASTER), |
743 | dwc_get_data_width(chan, DST_MASTER)); | |
a0982004 | 744 | |
3d4f8605 AS |
745 | src_width = dst_width = min_t(unsigned int, data_width, |
746 | dwc_fast_fls(src | dest | len)); | |
3bfb1d20 | 747 | |
327e6970 | 748 | ctllo = DWC_DEFAULT_CTLLO(chan) |
3bfb1d20 HS |
749 | | DWC_CTLL_DST_WIDTH(dst_width) |
750 | | DWC_CTLL_SRC_WIDTH(src_width) | |
751 | | DWC_CTLL_DST_INC | |
752 | | DWC_CTLL_SRC_INC | |
753 | | DWC_CTLL_FC_M2M; | |
754 | prev = first = NULL; | |
755 | ||
756 | for (offset = 0; offset < len; offset += xfer_count << src_width) { | |
757 | xfer_count = min_t(size_t, (len - offset) >> src_width, | |
4a63a8b3 | 758 | dwc->block_size); |
3bfb1d20 HS |
759 | |
760 | desc = dwc_desc_get(dwc); | |
761 | if (!desc) | |
762 | goto err_desc_get; | |
763 | ||
764 | desc->lli.sar = src + offset; | |
765 | desc->lli.dar = dest + offset; | |
766 | desc->lli.ctllo = ctllo; | |
767 | desc->lli.ctlhi = xfer_count; | |
768 | ||
769 | if (!first) { | |
770 | first = desc; | |
771 | } else { | |
772 | prev->lli.llp = desc->txd.phys; | |
41d5e59c | 773 | dma_sync_single_for_device(chan2parent(chan), |
3bfb1d20 HS |
774 | prev->txd.phys, sizeof(prev->lli), |
775 | DMA_TO_DEVICE); | |
776 | list_add_tail(&desc->desc_node, | |
e0bd0f8c | 777 | &first->tx_list); |
3bfb1d20 HS |
778 | } |
779 | prev = desc; | |
780 | } | |
781 | ||
782 | ||
783 | if (flags & DMA_PREP_INTERRUPT) | |
784 | /* Trigger interrupt after last block */ | |
785 | prev->lli.ctllo |= DWC_CTLL_INT_EN; | |
786 | ||
787 | prev->lli.llp = 0; | |
41d5e59c | 788 | dma_sync_single_for_device(chan2parent(chan), |
3bfb1d20 HS |
789 | prev->txd.phys, sizeof(prev->lli), |
790 | DMA_TO_DEVICE); | |
791 | ||
792 | first->txd.flags = flags; | |
793 | first->len = len; | |
794 | ||
795 | return &first->txd; | |
796 | ||
797 | err_desc_get: | |
798 | dwc_desc_put(dwc, first); | |
799 | return NULL; | |
800 | } | |
801 | ||
802 | static struct dma_async_tx_descriptor * | |
803 | dwc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, | |
db8196df | 804 | unsigned int sg_len, enum dma_transfer_direction direction, |
185ecb5f | 805 | unsigned long flags, void *context) |
3bfb1d20 HS |
806 | { |
807 | struct dw_dma_chan *dwc = to_dw_dma_chan(chan); | |
327e6970 | 808 | struct dma_slave_config *sconfig = &dwc->dma_sconfig; |
3bfb1d20 HS |
809 | struct dw_desc *prev; |
810 | struct dw_desc *first; | |
811 | u32 ctllo; | |
812 | dma_addr_t reg; | |
813 | unsigned int reg_width; | |
814 | unsigned int mem_width; | |
a0982004 | 815 | unsigned int data_width; |
3bfb1d20 HS |
816 | unsigned int i; |
817 | struct scatterlist *sg; | |
818 | size_t total_len = 0; | |
819 | ||
2e4c364e | 820 | dev_vdbg(chan2dev(chan), "%s\n", __func__); |
3bfb1d20 | 821 | |
495aea4b | 822 | if (unlikely(!is_slave_direction(direction) || !sg_len)) |
3bfb1d20 HS |
823 | return NULL; |
824 | ||
0fdb567f AS |
825 | dwc->direction = direction; |
826 | ||
3bfb1d20 HS |
827 | prev = first = NULL; |
828 | ||
3bfb1d20 | 829 | switch (direction) { |
db8196df | 830 | case DMA_MEM_TO_DEV: |
327e6970 VK |
831 | reg_width = __fls(sconfig->dst_addr_width); |
832 | reg = sconfig->dst_addr; | |
833 | ctllo = (DWC_DEFAULT_CTLLO(chan) | |
3bfb1d20 HS |
834 | | DWC_CTLL_DST_WIDTH(reg_width) |
835 | | DWC_CTLL_DST_FIX | |
327e6970 VK |
836 | | DWC_CTLL_SRC_INC); |
837 | ||
838 | ctllo |= sconfig->device_fc ? DWC_CTLL_FC(DW_DMA_FC_P_M2P) : | |
839 | DWC_CTLL_FC(DW_DMA_FC_D_M2P); | |
840 | ||
23d5f4ec | 841 | data_width = dwc_get_data_width(chan, SRC_MASTER); |
a0982004 | 842 | |
3bfb1d20 HS |
843 | for_each_sg(sgl, sg, sg_len, i) { |
844 | struct dw_desc *desc; | |
69dc14b5 | 845 | u32 len, dlen, mem; |
3bfb1d20 | 846 | |
cbb796cc | 847 | mem = sg_dma_address(sg); |
69dc14b5 | 848 | len = sg_dma_len(sg); |
6bc711f6 | 849 | |
a0982004 AS |
850 | mem_width = min_t(unsigned int, |
851 | data_width, dwc_fast_fls(mem | len)); | |
3bfb1d20 | 852 | |
69dc14b5 | 853 | slave_sg_todev_fill_desc: |
3bfb1d20 HS |
854 | desc = dwc_desc_get(dwc); |
855 | if (!desc) { | |
41d5e59c | 856 | dev_err(chan2dev(chan), |
3bfb1d20 HS |
857 | "not enough descriptors available\n"); |
858 | goto err_desc_get; | |
859 | } | |
860 | ||
3bfb1d20 HS |
861 | desc->lli.sar = mem; |
862 | desc->lli.dar = reg; | |
863 | desc->lli.ctllo = ctllo | DWC_CTLL_SRC_WIDTH(mem_width); | |
4a63a8b3 AS |
864 | if ((len >> mem_width) > dwc->block_size) { |
865 | dlen = dwc->block_size << mem_width; | |
69dc14b5 VK |
866 | mem += dlen; |
867 | len -= dlen; | |
868 | } else { | |
869 | dlen = len; | |
870 | len = 0; | |
871 | } | |
872 | ||
873 | desc->lli.ctlhi = dlen >> mem_width; | |
3bfb1d20 HS |
874 | |
875 | if (!first) { | |
876 | first = desc; | |
877 | } else { | |
878 | prev->lli.llp = desc->txd.phys; | |
41d5e59c | 879 | dma_sync_single_for_device(chan2parent(chan), |
3bfb1d20 HS |
880 | prev->txd.phys, |
881 | sizeof(prev->lli), | |
882 | DMA_TO_DEVICE); | |
883 | list_add_tail(&desc->desc_node, | |
e0bd0f8c | 884 | &first->tx_list); |
3bfb1d20 HS |
885 | } |
886 | prev = desc; | |
69dc14b5 VK |
887 | total_len += dlen; |
888 | ||
889 | if (len) | |
890 | goto slave_sg_todev_fill_desc; | |
3bfb1d20 HS |
891 | } |
892 | break; | |
db8196df | 893 | case DMA_DEV_TO_MEM: |
327e6970 VK |
894 | reg_width = __fls(sconfig->src_addr_width); |
895 | reg = sconfig->src_addr; | |
896 | ctllo = (DWC_DEFAULT_CTLLO(chan) | |
3bfb1d20 HS |
897 | | DWC_CTLL_SRC_WIDTH(reg_width) |
898 | | DWC_CTLL_DST_INC | |
327e6970 VK |
899 | | DWC_CTLL_SRC_FIX); |
900 | ||
901 | ctllo |= sconfig->device_fc ? DWC_CTLL_FC(DW_DMA_FC_P_P2M) : | |
902 | DWC_CTLL_FC(DW_DMA_FC_D_P2M); | |
3bfb1d20 | 903 | |
23d5f4ec | 904 | data_width = dwc_get_data_width(chan, DST_MASTER); |
a0982004 | 905 | |
3bfb1d20 HS |
906 | for_each_sg(sgl, sg, sg_len, i) { |
907 | struct dw_desc *desc; | |
69dc14b5 | 908 | u32 len, dlen, mem; |
3bfb1d20 | 909 | |
cbb796cc | 910 | mem = sg_dma_address(sg); |
3bfb1d20 | 911 | len = sg_dma_len(sg); |
6bc711f6 | 912 | |
a0982004 AS |
913 | mem_width = min_t(unsigned int, |
914 | data_width, dwc_fast_fls(mem | len)); | |
3bfb1d20 | 915 | |
69dc14b5 VK |
916 | slave_sg_fromdev_fill_desc: |
917 | desc = dwc_desc_get(dwc); | |
918 | if (!desc) { | |
919 | dev_err(chan2dev(chan), | |
920 | "not enough descriptors available\n"); | |
921 | goto err_desc_get; | |
922 | } | |
923 | ||
3bfb1d20 HS |
924 | desc->lli.sar = reg; |
925 | desc->lli.dar = mem; | |
926 | desc->lli.ctllo = ctllo | DWC_CTLL_DST_WIDTH(mem_width); | |
4a63a8b3 AS |
927 | if ((len >> reg_width) > dwc->block_size) { |
928 | dlen = dwc->block_size << reg_width; | |
69dc14b5 VK |
929 | mem += dlen; |
930 | len -= dlen; | |
931 | } else { | |
932 | dlen = len; | |
933 | len = 0; | |
934 | } | |
935 | desc->lli.ctlhi = dlen >> reg_width; | |
3bfb1d20 HS |
936 | |
937 | if (!first) { | |
938 | first = desc; | |
939 | } else { | |
940 | prev->lli.llp = desc->txd.phys; | |
41d5e59c | 941 | dma_sync_single_for_device(chan2parent(chan), |
3bfb1d20 HS |
942 | prev->txd.phys, |
943 | sizeof(prev->lli), | |
944 | DMA_TO_DEVICE); | |
945 | list_add_tail(&desc->desc_node, | |
e0bd0f8c | 946 | &first->tx_list); |
3bfb1d20 HS |
947 | } |
948 | prev = desc; | |
69dc14b5 VK |
949 | total_len += dlen; |
950 | ||
951 | if (len) | |
952 | goto slave_sg_fromdev_fill_desc; | |
3bfb1d20 HS |
953 | } |
954 | break; | |
955 | default: | |
956 | return NULL; | |
957 | } | |
958 | ||
959 | if (flags & DMA_PREP_INTERRUPT) | |
960 | /* Trigger interrupt after last block */ | |
961 | prev->lli.ctllo |= DWC_CTLL_INT_EN; | |
962 | ||
963 | prev->lli.llp = 0; | |
41d5e59c | 964 | dma_sync_single_for_device(chan2parent(chan), |
3bfb1d20 HS |
965 | prev->txd.phys, sizeof(prev->lli), |
966 | DMA_TO_DEVICE); | |
967 | ||
968 | first->len = total_len; | |
969 | ||
970 | return &first->txd; | |
971 | ||
972 | err_desc_get: | |
973 | dwc_desc_put(dwc, first); | |
974 | return NULL; | |
975 | } | |
976 | ||
327e6970 VK |
977 | /* |
978 | * Fix sconfig's burst size according to dw_dmac. We need to convert them as: | |
979 | * 1 -> 0, 4 -> 1, 8 -> 2, 16 -> 3. | |
980 | * | |
981 | * NOTE: burst size 2 is not supported by controller. | |
982 | * | |
983 | * This can be done by finding least significant bit set: n & (n - 1) | |
984 | */ | |
985 | static inline void convert_burst(u32 *maxburst) | |
986 | { | |
987 | if (*maxburst > 1) | |
988 | *maxburst = fls(*maxburst) - 2; | |
989 | else | |
990 | *maxburst = 0; | |
991 | } | |
992 | ||
993 | static int | |
994 | set_runtime_config(struct dma_chan *chan, struct dma_slave_config *sconfig) | |
995 | { | |
996 | struct dw_dma_chan *dwc = to_dw_dma_chan(chan); | |
997 | ||
495aea4b AS |
998 | /* Check if chan will be configured for slave transfers */ |
999 | if (!is_slave_direction(sconfig->direction)) | |
327e6970 VK |
1000 | return -EINVAL; |
1001 | ||
1002 | memcpy(&dwc->dma_sconfig, sconfig, sizeof(*sconfig)); | |
0fdb567f | 1003 | dwc->direction = sconfig->direction; |
327e6970 VK |
1004 | |
1005 | convert_burst(&dwc->dma_sconfig.src_maxburst); | |
1006 | convert_burst(&dwc->dma_sconfig.dst_maxburst); | |
1007 | ||
1008 | return 0; | |
1009 | } | |
1010 | ||
21fe3c52 AS |
1011 | static inline void dwc_chan_pause(struct dw_dma_chan *dwc) |
1012 | { | |
1013 | u32 cfglo = channel_readl(dwc, CFG_LO); | |
1014 | ||
1015 | channel_writel(dwc, CFG_LO, cfglo | DWC_CFGL_CH_SUSP); | |
1016 | while (!(channel_readl(dwc, CFG_LO) & DWC_CFGL_FIFO_EMPTY)) | |
1017 | cpu_relax(); | |
1018 | ||
1019 | dwc->paused = true; | |
1020 | } | |
1021 | ||
1022 | static inline void dwc_chan_resume(struct dw_dma_chan *dwc) | |
1023 | { | |
1024 | u32 cfglo = channel_readl(dwc, CFG_LO); | |
1025 | ||
1026 | channel_writel(dwc, CFG_LO, cfglo & ~DWC_CFGL_CH_SUSP); | |
1027 | ||
1028 | dwc->paused = false; | |
1029 | } | |
1030 | ||
05827630 LW |
1031 | static int dwc_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, |
1032 | unsigned long arg) | |
3bfb1d20 HS |
1033 | { |
1034 | struct dw_dma_chan *dwc = to_dw_dma_chan(chan); | |
1035 | struct dw_dma *dw = to_dw_dma(chan->device); | |
1036 | struct dw_desc *desc, *_desc; | |
69cea5a0 | 1037 | unsigned long flags; |
3bfb1d20 HS |
1038 | LIST_HEAD(list); |
1039 | ||
a7c57cf7 LW |
1040 | if (cmd == DMA_PAUSE) { |
1041 | spin_lock_irqsave(&dwc->lock, flags); | |
c3635c78 | 1042 | |
21fe3c52 | 1043 | dwc_chan_pause(dwc); |
3bfb1d20 | 1044 | |
a7c57cf7 LW |
1045 | spin_unlock_irqrestore(&dwc->lock, flags); |
1046 | } else if (cmd == DMA_RESUME) { | |
1047 | if (!dwc->paused) | |
1048 | return 0; | |
3bfb1d20 | 1049 | |
a7c57cf7 | 1050 | spin_lock_irqsave(&dwc->lock, flags); |
3bfb1d20 | 1051 | |
21fe3c52 | 1052 | dwc_chan_resume(dwc); |
3bfb1d20 | 1053 | |
a7c57cf7 LW |
1054 | spin_unlock_irqrestore(&dwc->lock, flags); |
1055 | } else if (cmd == DMA_TERMINATE_ALL) { | |
1056 | spin_lock_irqsave(&dwc->lock, flags); | |
3bfb1d20 | 1057 | |
fed2574b AS |
1058 | clear_bit(DW_DMA_IS_SOFT_LLP, &dwc->flags); |
1059 | ||
3f936207 | 1060 | dwc_chan_disable(dw, dwc); |
a7c57cf7 LW |
1061 | |
1062 | dwc->paused = false; | |
1063 | ||
1064 | /* active_list entries will end up before queued entries */ | |
1065 | list_splice_init(&dwc->queue, &list); | |
1066 | list_splice_init(&dwc->active_list, &list); | |
1067 | ||
1068 | spin_unlock_irqrestore(&dwc->lock, flags); | |
1069 | ||
1070 | /* Flush all pending and queued descriptors */ | |
1071 | list_for_each_entry_safe(desc, _desc, &list, desc_node) | |
1072 | dwc_descriptor_complete(dwc, desc, false); | |
327e6970 VK |
1073 | } else if (cmd == DMA_SLAVE_CONFIG) { |
1074 | return set_runtime_config(chan, (struct dma_slave_config *)arg); | |
1075 | } else { | |
a7c57cf7 | 1076 | return -ENXIO; |
327e6970 | 1077 | } |
c3635c78 LW |
1078 | |
1079 | return 0; | |
3bfb1d20 HS |
1080 | } |
1081 | ||
1082 | static enum dma_status | |
07934481 LW |
1083 | dwc_tx_status(struct dma_chan *chan, |
1084 | dma_cookie_t cookie, | |
1085 | struct dma_tx_state *txstate) | |
3bfb1d20 HS |
1086 | { |
1087 | struct dw_dma_chan *dwc = to_dw_dma_chan(chan); | |
96a2af41 | 1088 | enum dma_status ret; |
3bfb1d20 | 1089 | |
96a2af41 | 1090 | ret = dma_cookie_status(chan, cookie, txstate); |
3bfb1d20 HS |
1091 | if (ret != DMA_SUCCESS) { |
1092 | dwc_scan_descriptors(to_dw_dma(chan->device), dwc); | |
1093 | ||
96a2af41 | 1094 | ret = dma_cookie_status(chan, cookie, txstate); |
3bfb1d20 HS |
1095 | } |
1096 | ||
abf53902 | 1097 | if (ret != DMA_SUCCESS) |
96a2af41 | 1098 | dma_set_residue(txstate, dwc_first_active(dwc)->len); |
3bfb1d20 | 1099 | |
a7c57cf7 LW |
1100 | if (dwc->paused) |
1101 | return DMA_PAUSED; | |
3bfb1d20 HS |
1102 | |
1103 | return ret; | |
1104 | } | |
1105 | ||
1106 | static void dwc_issue_pending(struct dma_chan *chan) | |
1107 | { | |
1108 | struct dw_dma_chan *dwc = to_dw_dma_chan(chan); | |
1109 | ||
3bfb1d20 HS |
1110 | if (!list_empty(&dwc->queue)) |
1111 | dwc_scan_descriptors(to_dw_dma(chan->device), dwc); | |
3bfb1d20 HS |
1112 | } |
1113 | ||
aa1e6f1a | 1114 | static int dwc_alloc_chan_resources(struct dma_chan *chan) |
3bfb1d20 HS |
1115 | { |
1116 | struct dw_dma_chan *dwc = to_dw_dma_chan(chan); | |
1117 | struct dw_dma *dw = to_dw_dma(chan->device); | |
1118 | struct dw_desc *desc; | |
3bfb1d20 | 1119 | int i; |
69cea5a0 | 1120 | unsigned long flags; |
cbd65312 | 1121 | int ret; |
3bfb1d20 | 1122 | |
2e4c364e | 1123 | dev_vdbg(chan2dev(chan), "%s\n", __func__); |
3bfb1d20 | 1124 | |
3bfb1d20 HS |
1125 | /* ASSERT: channel is idle */ |
1126 | if (dma_readl(dw, CH_EN) & dwc->mask) { | |
41d5e59c | 1127 | dev_dbg(chan2dev(chan), "DMA channel not idle?\n"); |
3bfb1d20 HS |
1128 | return -EIO; |
1129 | } | |
1130 | ||
d3ee98cd | 1131 | dma_cookie_init(chan); |
3bfb1d20 | 1132 | |
3bfb1d20 HS |
1133 | /* |
1134 | * NOTE: some controllers may have additional features that we | |
1135 | * need to initialize here, like "scatter-gather" (which | |
1136 | * doesn't mean what you think it means), and status writeback. | |
1137 | */ | |
1138 | ||
69cea5a0 | 1139 | spin_lock_irqsave(&dwc->lock, flags); |
3bfb1d20 HS |
1140 | i = dwc->descs_allocated; |
1141 | while (dwc->descs_allocated < NR_DESCS_PER_CHANNEL) { | |
69cea5a0 | 1142 | spin_unlock_irqrestore(&dwc->lock, flags); |
3bfb1d20 HS |
1143 | |
1144 | desc = kzalloc(sizeof(struct dw_desc), GFP_KERNEL); | |
cbd65312 AS |
1145 | if (!desc) |
1146 | goto err_desc_alloc; | |
3bfb1d20 | 1147 | |
e0bd0f8c | 1148 | INIT_LIST_HEAD(&desc->tx_list); |
3bfb1d20 HS |
1149 | dma_async_tx_descriptor_init(&desc->txd, chan); |
1150 | desc->txd.tx_submit = dwc_tx_submit; | |
1151 | desc->txd.flags = DMA_CTRL_ACK; | |
41d5e59c | 1152 | desc->txd.phys = dma_map_single(chan2parent(chan), &desc->lli, |
3bfb1d20 | 1153 | sizeof(desc->lli), DMA_TO_DEVICE); |
cbd65312 AS |
1154 | ret = dma_mapping_error(chan2parent(chan), desc->txd.phys); |
1155 | if (ret) | |
1156 | goto err_desc_alloc; | |
1157 | ||
3bfb1d20 HS |
1158 | dwc_desc_put(dwc, desc); |
1159 | ||
69cea5a0 | 1160 | spin_lock_irqsave(&dwc->lock, flags); |
3bfb1d20 HS |
1161 | i = ++dwc->descs_allocated; |
1162 | } | |
1163 | ||
69cea5a0 | 1164 | spin_unlock_irqrestore(&dwc->lock, flags); |
3bfb1d20 | 1165 | |
2e4c364e | 1166 | dev_dbg(chan2dev(chan), "%s: allocated %d descriptors\n", __func__, i); |
3bfb1d20 | 1167 | |
cbd65312 AS |
1168 | return i; |
1169 | ||
1170 | err_desc_alloc: | |
1171 | kfree(desc); | |
1172 | ||
1173 | dev_info(chan2dev(chan), "only allocated %d descriptors\n", i); | |
1174 | ||
3bfb1d20 HS |
1175 | return i; |
1176 | } | |
1177 | ||
1178 | static void dwc_free_chan_resources(struct dma_chan *chan) | |
1179 | { | |
1180 | struct dw_dma_chan *dwc = to_dw_dma_chan(chan); | |
1181 | struct dw_dma *dw = to_dw_dma(chan->device); | |
1182 | struct dw_desc *desc, *_desc; | |
69cea5a0 | 1183 | unsigned long flags; |
3bfb1d20 HS |
1184 | LIST_HEAD(list); |
1185 | ||
2e4c364e | 1186 | dev_dbg(chan2dev(chan), "%s: descs allocated=%u\n", __func__, |
3bfb1d20 HS |
1187 | dwc->descs_allocated); |
1188 | ||
1189 | /* ASSERT: channel is idle */ | |
1190 | BUG_ON(!list_empty(&dwc->active_list)); | |
1191 | BUG_ON(!list_empty(&dwc->queue)); | |
1192 | BUG_ON(dma_readl(to_dw_dma(chan->device), CH_EN) & dwc->mask); | |
1193 | ||
69cea5a0 | 1194 | spin_lock_irqsave(&dwc->lock, flags); |
3bfb1d20 HS |
1195 | list_splice_init(&dwc->free_list, &list); |
1196 | dwc->descs_allocated = 0; | |
61e183f8 | 1197 | dwc->initialized = false; |
3bfb1d20 HS |
1198 | |
1199 | /* Disable interrupts */ | |
1200 | channel_clear_bit(dw, MASK.XFER, dwc->mask); | |
3bfb1d20 HS |
1201 | channel_clear_bit(dw, MASK.ERROR, dwc->mask); |
1202 | ||
69cea5a0 | 1203 | spin_unlock_irqrestore(&dwc->lock, flags); |
3bfb1d20 HS |
1204 | |
1205 | list_for_each_entry_safe(desc, _desc, &list, desc_node) { | |
41d5e59c DW |
1206 | dev_vdbg(chan2dev(chan), " freeing descriptor %p\n", desc); |
1207 | dma_unmap_single(chan2parent(chan), desc->txd.phys, | |
3bfb1d20 HS |
1208 | sizeof(desc->lli), DMA_TO_DEVICE); |
1209 | kfree(desc); | |
1210 | } | |
1211 | ||
2e4c364e | 1212 | dev_vdbg(chan2dev(chan), "%s: done\n", __func__); |
3bfb1d20 HS |
1213 | } |
1214 | ||
a9ddb575 VK |
1215 | bool dw_dma_generic_filter(struct dma_chan *chan, void *param) |
1216 | { | |
1217 | struct dw_dma *dw = to_dw_dma(chan->device); | |
1218 | static struct dw_dma *last_dw; | |
1219 | static char *last_bus_id; | |
1220 | int i = -1; | |
1221 | ||
1222 | /* | |
1223 | * dmaengine framework calls this routine for all channels of all dma | |
1224 | * controller, until true is returned. If 'param' bus_id is not | |
1225 | * registered with a dma controller (dw), then there is no need of | |
1226 | * running below function for all channels of dw. | |
1227 | * | |
1228 | * This block of code does this by saving the parameters of last | |
1229 | * failure. If dw and param are same, i.e. trying on same dw with | |
1230 | * different channel, return false. | |
1231 | */ | |
1232 | if ((last_dw == dw) && (last_bus_id == param)) | |
1233 | return false; | |
1234 | /* | |
1235 | * Return true: | |
1236 | * - If dw_dma's platform data is not filled with slave info, then all | |
1237 | * dma controllers are fine for transfer. | |
1238 | * - Or if param is NULL | |
1239 | */ | |
1240 | if (!dw->sd || !param) | |
1241 | return true; | |
1242 | ||
1243 | while (++i < dw->sd_count) { | |
1244 | if (!strcmp(dw->sd[i].bus_id, param)) { | |
1245 | chan->private = &dw->sd[i]; | |
1246 | last_dw = NULL; | |
1247 | last_bus_id = NULL; | |
1248 | ||
1249 | return true; | |
1250 | } | |
1251 | } | |
1252 | ||
1253 | last_dw = dw; | |
1254 | last_bus_id = param; | |
1255 | return false; | |
1256 | } | |
1257 | EXPORT_SYMBOL(dw_dma_generic_filter); | |
1258 | ||
d9de4519 HCE |
1259 | /* --------------------- Cyclic DMA API extensions -------------------- */ |
1260 | ||
1261 | /** | |
1262 | * dw_dma_cyclic_start - start the cyclic DMA transfer | |
1263 | * @chan: the DMA channel to start | |
1264 | * | |
1265 | * Must be called with soft interrupts disabled. Returns zero on success or | |
1266 | * -errno on failure. | |
1267 | */ | |
1268 | int dw_dma_cyclic_start(struct dma_chan *chan) | |
1269 | { | |
1270 | struct dw_dma_chan *dwc = to_dw_dma_chan(chan); | |
1271 | struct dw_dma *dw = to_dw_dma(dwc->chan.device); | |
69cea5a0 | 1272 | unsigned long flags; |
d9de4519 HCE |
1273 | |
1274 | if (!test_bit(DW_DMA_IS_CYCLIC, &dwc->flags)) { | |
1275 | dev_err(chan2dev(&dwc->chan), "missing prep for cyclic DMA\n"); | |
1276 | return -ENODEV; | |
1277 | } | |
1278 | ||
69cea5a0 | 1279 | spin_lock_irqsave(&dwc->lock, flags); |
d9de4519 HCE |
1280 | |
1281 | /* assert channel is idle */ | |
1282 | if (dma_readl(dw, CH_EN) & dwc->mask) { | |
1283 | dev_err(chan2dev(&dwc->chan), | |
1284 | "BUG: Attempted to start non-idle channel\n"); | |
1d455437 | 1285 | dwc_dump_chan_regs(dwc); |
69cea5a0 | 1286 | spin_unlock_irqrestore(&dwc->lock, flags); |
d9de4519 HCE |
1287 | return -EBUSY; |
1288 | } | |
1289 | ||
d9de4519 HCE |
1290 | dma_writel(dw, CLEAR.ERROR, dwc->mask); |
1291 | dma_writel(dw, CLEAR.XFER, dwc->mask); | |
1292 | ||
1293 | /* setup DMAC channel registers */ | |
1294 | channel_writel(dwc, LLP, dwc->cdesc->desc[0]->txd.phys); | |
1295 | channel_writel(dwc, CTL_LO, DWC_CTLL_LLP_D_EN | DWC_CTLL_LLP_S_EN); | |
1296 | channel_writel(dwc, CTL_HI, 0); | |
1297 | ||
1298 | channel_set_bit(dw, CH_EN, dwc->mask); | |
1299 | ||
69cea5a0 | 1300 | spin_unlock_irqrestore(&dwc->lock, flags); |
d9de4519 HCE |
1301 | |
1302 | return 0; | |
1303 | } | |
1304 | EXPORT_SYMBOL(dw_dma_cyclic_start); | |
1305 | ||
1306 | /** | |
1307 | * dw_dma_cyclic_stop - stop the cyclic DMA transfer | |
1308 | * @chan: the DMA channel to stop | |
1309 | * | |
1310 | * Must be called with soft interrupts disabled. | |
1311 | */ | |
1312 | void dw_dma_cyclic_stop(struct dma_chan *chan) | |
1313 | { | |
1314 | struct dw_dma_chan *dwc = to_dw_dma_chan(chan); | |
1315 | struct dw_dma *dw = to_dw_dma(dwc->chan.device); | |
69cea5a0 | 1316 | unsigned long flags; |
d9de4519 | 1317 | |
69cea5a0 | 1318 | spin_lock_irqsave(&dwc->lock, flags); |
d9de4519 | 1319 | |
3f936207 | 1320 | dwc_chan_disable(dw, dwc); |
d9de4519 | 1321 | |
69cea5a0 | 1322 | spin_unlock_irqrestore(&dwc->lock, flags); |
d9de4519 HCE |
1323 | } |
1324 | EXPORT_SYMBOL(dw_dma_cyclic_stop); | |
1325 | ||
1326 | /** | |
1327 | * dw_dma_cyclic_prep - prepare the cyclic DMA transfer | |
1328 | * @chan: the DMA channel to prepare | |
1329 | * @buf_addr: physical DMA address where the buffer starts | |
1330 | * @buf_len: total number of bytes for the entire buffer | |
1331 | * @period_len: number of bytes for each period | |
1332 | * @direction: transfer direction, to or from device | |
1333 | * | |
1334 | * Must be called before trying to start the transfer. Returns a valid struct | |
1335 | * dw_cyclic_desc if successful or an ERR_PTR(-errno) if not successful. | |
1336 | */ | |
1337 | struct dw_cyclic_desc *dw_dma_cyclic_prep(struct dma_chan *chan, | |
1338 | dma_addr_t buf_addr, size_t buf_len, size_t period_len, | |
db8196df | 1339 | enum dma_transfer_direction direction) |
d9de4519 HCE |
1340 | { |
1341 | struct dw_dma_chan *dwc = to_dw_dma_chan(chan); | |
327e6970 | 1342 | struct dma_slave_config *sconfig = &dwc->dma_sconfig; |
d9de4519 HCE |
1343 | struct dw_cyclic_desc *cdesc; |
1344 | struct dw_cyclic_desc *retval = NULL; | |
1345 | struct dw_desc *desc; | |
1346 | struct dw_desc *last = NULL; | |
d9de4519 HCE |
1347 | unsigned long was_cyclic; |
1348 | unsigned int reg_width; | |
1349 | unsigned int periods; | |
1350 | unsigned int i; | |
69cea5a0 | 1351 | unsigned long flags; |
d9de4519 | 1352 | |
69cea5a0 | 1353 | spin_lock_irqsave(&dwc->lock, flags); |
fed2574b AS |
1354 | if (dwc->nollp) { |
1355 | spin_unlock_irqrestore(&dwc->lock, flags); | |
1356 | dev_dbg(chan2dev(&dwc->chan), | |
1357 | "channel doesn't support LLP transfers\n"); | |
1358 | return ERR_PTR(-EINVAL); | |
1359 | } | |
1360 | ||
d9de4519 | 1361 | if (!list_empty(&dwc->queue) || !list_empty(&dwc->active_list)) { |
69cea5a0 | 1362 | spin_unlock_irqrestore(&dwc->lock, flags); |
d9de4519 HCE |
1363 | dev_dbg(chan2dev(&dwc->chan), |
1364 | "queue and/or active list are not empty\n"); | |
1365 | return ERR_PTR(-EBUSY); | |
1366 | } | |
1367 | ||
1368 | was_cyclic = test_and_set_bit(DW_DMA_IS_CYCLIC, &dwc->flags); | |
69cea5a0 | 1369 | spin_unlock_irqrestore(&dwc->lock, flags); |
d9de4519 HCE |
1370 | if (was_cyclic) { |
1371 | dev_dbg(chan2dev(&dwc->chan), | |
1372 | "channel already prepared for cyclic DMA\n"); | |
1373 | return ERR_PTR(-EBUSY); | |
1374 | } | |
1375 | ||
1376 | retval = ERR_PTR(-EINVAL); | |
327e6970 | 1377 | |
f44b92f4 AS |
1378 | if (unlikely(!is_slave_direction(direction))) |
1379 | goto out_err; | |
1380 | ||
0fdb567f AS |
1381 | dwc->direction = direction; |
1382 | ||
327e6970 VK |
1383 | if (direction == DMA_MEM_TO_DEV) |
1384 | reg_width = __ffs(sconfig->dst_addr_width); | |
1385 | else | |
1386 | reg_width = __ffs(sconfig->src_addr_width); | |
1387 | ||
d9de4519 HCE |
1388 | periods = buf_len / period_len; |
1389 | ||
1390 | /* Check for too big/unaligned periods and unaligned DMA buffer. */ | |
4a63a8b3 | 1391 | if (period_len > (dwc->block_size << reg_width)) |
d9de4519 HCE |
1392 | goto out_err; |
1393 | if (unlikely(period_len & ((1 << reg_width) - 1))) | |
1394 | goto out_err; | |
1395 | if (unlikely(buf_addr & ((1 << reg_width) - 1))) | |
1396 | goto out_err; | |
d9de4519 HCE |
1397 | |
1398 | retval = ERR_PTR(-ENOMEM); | |
1399 | ||
1400 | if (periods > NR_DESCS_PER_CHANNEL) | |
1401 | goto out_err; | |
1402 | ||
1403 | cdesc = kzalloc(sizeof(struct dw_cyclic_desc), GFP_KERNEL); | |
1404 | if (!cdesc) | |
1405 | goto out_err; | |
1406 | ||
1407 | cdesc->desc = kzalloc(sizeof(struct dw_desc *) * periods, GFP_KERNEL); | |
1408 | if (!cdesc->desc) | |
1409 | goto out_err_alloc; | |
1410 | ||
1411 | for (i = 0; i < periods; i++) { | |
1412 | desc = dwc_desc_get(dwc); | |
1413 | if (!desc) | |
1414 | goto out_err_desc_get; | |
1415 | ||
1416 | switch (direction) { | |
db8196df | 1417 | case DMA_MEM_TO_DEV: |
327e6970 | 1418 | desc->lli.dar = sconfig->dst_addr; |
d9de4519 | 1419 | desc->lli.sar = buf_addr + (period_len * i); |
327e6970 | 1420 | desc->lli.ctllo = (DWC_DEFAULT_CTLLO(chan) |
d9de4519 HCE |
1421 | | DWC_CTLL_DST_WIDTH(reg_width) |
1422 | | DWC_CTLL_SRC_WIDTH(reg_width) | |
1423 | | DWC_CTLL_DST_FIX | |
1424 | | DWC_CTLL_SRC_INC | |
d9de4519 | 1425 | | DWC_CTLL_INT_EN); |
327e6970 VK |
1426 | |
1427 | desc->lli.ctllo |= sconfig->device_fc ? | |
1428 | DWC_CTLL_FC(DW_DMA_FC_P_M2P) : | |
1429 | DWC_CTLL_FC(DW_DMA_FC_D_M2P); | |
1430 | ||
d9de4519 | 1431 | break; |
db8196df | 1432 | case DMA_DEV_TO_MEM: |
d9de4519 | 1433 | desc->lli.dar = buf_addr + (period_len * i); |
327e6970 VK |
1434 | desc->lli.sar = sconfig->src_addr; |
1435 | desc->lli.ctllo = (DWC_DEFAULT_CTLLO(chan) | |
d9de4519 HCE |
1436 | | DWC_CTLL_SRC_WIDTH(reg_width) |
1437 | | DWC_CTLL_DST_WIDTH(reg_width) | |
1438 | | DWC_CTLL_DST_INC | |
1439 | | DWC_CTLL_SRC_FIX | |
d9de4519 | 1440 | | DWC_CTLL_INT_EN); |
327e6970 VK |
1441 | |
1442 | desc->lli.ctllo |= sconfig->device_fc ? | |
1443 | DWC_CTLL_FC(DW_DMA_FC_P_P2M) : | |
1444 | DWC_CTLL_FC(DW_DMA_FC_D_P2M); | |
1445 | ||
d9de4519 HCE |
1446 | break; |
1447 | default: | |
1448 | break; | |
1449 | } | |
1450 | ||
1451 | desc->lli.ctlhi = (period_len >> reg_width); | |
1452 | cdesc->desc[i] = desc; | |
1453 | ||
1454 | if (last) { | |
1455 | last->lli.llp = desc->txd.phys; | |
1456 | dma_sync_single_for_device(chan2parent(chan), | |
1457 | last->txd.phys, sizeof(last->lli), | |
1458 | DMA_TO_DEVICE); | |
1459 | } | |
1460 | ||
1461 | last = desc; | |
1462 | } | |
1463 | ||
1464 | /* lets make a cyclic list */ | |
1465 | last->lli.llp = cdesc->desc[0]->txd.phys; | |
1466 | dma_sync_single_for_device(chan2parent(chan), last->txd.phys, | |
1467 | sizeof(last->lli), DMA_TO_DEVICE); | |
1468 | ||
2f45d613 AS |
1469 | dev_dbg(chan2dev(&dwc->chan), "cyclic prepared buf 0x%llx len %zu " |
1470 | "period %zu periods %d\n", (unsigned long long)buf_addr, | |
1471 | buf_len, period_len, periods); | |
d9de4519 HCE |
1472 | |
1473 | cdesc->periods = periods; | |
1474 | dwc->cdesc = cdesc; | |
1475 | ||
1476 | return cdesc; | |
1477 | ||
1478 | out_err_desc_get: | |
1479 | while (i--) | |
1480 | dwc_desc_put(dwc, cdesc->desc[i]); | |
1481 | out_err_alloc: | |
1482 | kfree(cdesc); | |
1483 | out_err: | |
1484 | clear_bit(DW_DMA_IS_CYCLIC, &dwc->flags); | |
1485 | return (struct dw_cyclic_desc *)retval; | |
1486 | } | |
1487 | EXPORT_SYMBOL(dw_dma_cyclic_prep); | |
1488 | ||
1489 | /** | |
1490 | * dw_dma_cyclic_free - free a prepared cyclic DMA transfer | |
1491 | * @chan: the DMA channel to free | |
1492 | */ | |
1493 | void dw_dma_cyclic_free(struct dma_chan *chan) | |
1494 | { | |
1495 | struct dw_dma_chan *dwc = to_dw_dma_chan(chan); | |
1496 | struct dw_dma *dw = to_dw_dma(dwc->chan.device); | |
1497 | struct dw_cyclic_desc *cdesc = dwc->cdesc; | |
1498 | int i; | |
69cea5a0 | 1499 | unsigned long flags; |
d9de4519 | 1500 | |
2e4c364e | 1501 | dev_dbg(chan2dev(&dwc->chan), "%s\n", __func__); |
d9de4519 HCE |
1502 | |
1503 | if (!cdesc) | |
1504 | return; | |
1505 | ||
69cea5a0 | 1506 | spin_lock_irqsave(&dwc->lock, flags); |
d9de4519 | 1507 | |
3f936207 | 1508 | dwc_chan_disable(dw, dwc); |
d9de4519 | 1509 | |
d9de4519 HCE |
1510 | dma_writel(dw, CLEAR.ERROR, dwc->mask); |
1511 | dma_writel(dw, CLEAR.XFER, dwc->mask); | |
1512 | ||
69cea5a0 | 1513 | spin_unlock_irqrestore(&dwc->lock, flags); |
d9de4519 HCE |
1514 | |
1515 | for (i = 0; i < cdesc->periods; i++) | |
1516 | dwc_desc_put(dwc, cdesc->desc[i]); | |
1517 | ||
1518 | kfree(cdesc->desc); | |
1519 | kfree(cdesc); | |
1520 | ||
1521 | clear_bit(DW_DMA_IS_CYCLIC, &dwc->flags); | |
1522 | } | |
1523 | EXPORT_SYMBOL(dw_dma_cyclic_free); | |
1524 | ||
3bfb1d20 HS |
1525 | /*----------------------------------------------------------------------*/ |
1526 | ||
1527 | static void dw_dma_off(struct dw_dma *dw) | |
1528 | { | |
61e183f8 VK |
1529 | int i; |
1530 | ||
3bfb1d20 HS |
1531 | dma_writel(dw, CFG, 0); |
1532 | ||
1533 | channel_clear_bit(dw, MASK.XFER, dw->all_chan_mask); | |
3bfb1d20 HS |
1534 | channel_clear_bit(dw, MASK.SRC_TRAN, dw->all_chan_mask); |
1535 | channel_clear_bit(dw, MASK.DST_TRAN, dw->all_chan_mask); | |
1536 | channel_clear_bit(dw, MASK.ERROR, dw->all_chan_mask); | |
1537 | ||
1538 | while (dma_readl(dw, CFG) & DW_CFG_DMA_EN) | |
1539 | cpu_relax(); | |
61e183f8 VK |
1540 | |
1541 | for (i = 0; i < dw->dma.chancnt; i++) | |
1542 | dw->chan[i].initialized = false; | |
3bfb1d20 HS |
1543 | } |
1544 | ||
a9ddb575 VK |
1545 | #ifdef CONFIG_OF |
1546 | static struct dw_dma_platform_data * | |
1547 | dw_dma_parse_dt(struct platform_device *pdev) | |
1548 | { | |
1549 | struct device_node *sn, *cn, *np = pdev->dev.of_node; | |
1550 | struct dw_dma_platform_data *pdata; | |
1551 | struct dw_dma_slave *sd; | |
1552 | u32 tmp, arr[4]; | |
1553 | ||
1554 | if (!np) { | |
1555 | dev_err(&pdev->dev, "Missing DT data\n"); | |
1556 | return NULL; | |
1557 | } | |
1558 | ||
1559 | pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); | |
1560 | if (!pdata) | |
1561 | return NULL; | |
1562 | ||
1563 | if (of_property_read_u32(np, "nr_channels", &pdata->nr_channels)) | |
1564 | return NULL; | |
1565 | ||
1566 | if (of_property_read_bool(np, "is_private")) | |
1567 | pdata->is_private = true; | |
1568 | ||
1569 | if (!of_property_read_u32(np, "chan_allocation_order", &tmp)) | |
1570 | pdata->chan_allocation_order = (unsigned char)tmp; | |
1571 | ||
1572 | if (!of_property_read_u32(np, "chan_priority", &tmp)) | |
1573 | pdata->chan_priority = tmp; | |
1574 | ||
1575 | if (!of_property_read_u32(np, "block_size", &tmp)) | |
1576 | pdata->block_size = tmp; | |
1577 | ||
1578 | if (!of_property_read_u32(np, "nr_masters", &tmp)) { | |
1579 | if (tmp > 4) | |
1580 | return NULL; | |
1581 | ||
1582 | pdata->nr_masters = tmp; | |
1583 | } | |
1584 | ||
1585 | if (!of_property_read_u32_array(np, "data_width", arr, | |
1586 | pdata->nr_masters)) | |
1587 | for (tmp = 0; tmp < pdata->nr_masters; tmp++) | |
1588 | pdata->data_width[tmp] = arr[tmp]; | |
1589 | ||
1590 | /* parse slave data */ | |
1591 | sn = of_find_node_by_name(np, "slave_info"); | |
1592 | if (!sn) | |
1593 | return pdata; | |
1594 | ||
1595 | /* calculate number of slaves */ | |
1596 | tmp = of_get_child_count(sn); | |
1597 | if (!tmp) | |
1598 | return NULL; | |
1599 | ||
1600 | sd = devm_kzalloc(&pdev->dev, sizeof(*sd) * tmp, GFP_KERNEL); | |
1601 | if (!sd) | |
1602 | return NULL; | |
1603 | ||
1604 | pdata->sd = sd; | |
1605 | pdata->sd_count = tmp; | |
1606 | ||
1607 | for_each_child_of_node(sn, cn) { | |
1608 | sd->dma_dev = &pdev->dev; | |
1609 | of_property_read_string(cn, "bus_id", &sd->bus_id); | |
1610 | of_property_read_u32(cn, "cfg_hi", &sd->cfg_hi); | |
1611 | of_property_read_u32(cn, "cfg_lo", &sd->cfg_lo); | |
1612 | if (!of_property_read_u32(cn, "src_master", &tmp)) | |
1613 | sd->src_master = tmp; | |
1614 | ||
1615 | if (!of_property_read_u32(cn, "dst_master", &tmp)) | |
1616 | sd->dst_master = tmp; | |
1617 | sd++; | |
1618 | } | |
1619 | ||
1620 | return pdata; | |
1621 | } | |
1622 | #else | |
1623 | static inline struct dw_dma_platform_data * | |
1624 | dw_dma_parse_dt(struct platform_device *pdev) | |
1625 | { | |
1626 | return NULL; | |
1627 | } | |
1628 | #endif | |
1629 | ||
463a1f8b | 1630 | static int dw_probe(struct platform_device *pdev) |
3bfb1d20 HS |
1631 | { |
1632 | struct dw_dma_platform_data *pdata; | |
1633 | struct resource *io; | |
1634 | struct dw_dma *dw; | |
1635 | size_t size; | |
482c67ea AS |
1636 | void __iomem *regs; |
1637 | bool autocfg; | |
1638 | unsigned int dw_params; | |
1639 | unsigned int nr_channels; | |
4a63a8b3 | 1640 | unsigned int max_blk_size = 0; |
3bfb1d20 HS |
1641 | int irq; |
1642 | int err; | |
1643 | int i; | |
1644 | ||
3bfb1d20 HS |
1645 | io = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
1646 | if (!io) | |
1647 | return -EINVAL; | |
1648 | ||
1649 | irq = platform_get_irq(pdev, 0); | |
1650 | if (irq < 0) | |
1651 | return irq; | |
1652 | ||
482c67ea AS |
1653 | regs = devm_request_and_ioremap(&pdev->dev, io); |
1654 | if (!regs) | |
1655 | return -EBUSY; | |
1656 | ||
1657 | dw_params = dma_read_byaddr(regs, DW_PARAMS); | |
1658 | autocfg = dw_params >> DW_PARAMS_EN & 0x1; | |
1659 | ||
123de543 AS |
1660 | pdata = dev_get_platdata(&pdev->dev); |
1661 | if (!pdata) | |
1662 | pdata = dw_dma_parse_dt(pdev); | |
1663 | ||
1664 | if (!pdata && autocfg) { | |
1665 | pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); | |
1666 | if (!pdata) | |
1667 | return -ENOMEM; | |
1668 | ||
1669 | /* Fill platform data with the default values */ | |
1670 | pdata->is_private = true; | |
1671 | pdata->chan_allocation_order = CHAN_ALLOCATION_ASCENDING; | |
1672 | pdata->chan_priority = CHAN_PRIORITY_ASCENDING; | |
1673 | } else if (!pdata || pdata->nr_channels > DW_DMA_MAX_NR_CHANNELS) | |
1674 | return -EINVAL; | |
1675 | ||
482c67ea AS |
1676 | if (autocfg) |
1677 | nr_channels = (dw_params >> DW_PARAMS_NR_CHAN & 0x7) + 1; | |
1678 | else | |
1679 | nr_channels = pdata->nr_channels; | |
1680 | ||
1681 | size = sizeof(struct dw_dma) + nr_channels * sizeof(struct dw_dma_chan); | |
dbde5c29 | 1682 | dw = devm_kzalloc(&pdev->dev, size, GFP_KERNEL); |
3bfb1d20 HS |
1683 | if (!dw) |
1684 | return -ENOMEM; | |
1685 | ||
dbde5c29 AS |
1686 | dw->clk = devm_clk_get(&pdev->dev, "hclk"); |
1687 | if (IS_ERR(dw->clk)) | |
1688 | return PTR_ERR(dw->clk); | |
3075528d | 1689 | clk_prepare_enable(dw->clk); |
3bfb1d20 | 1690 | |
482c67ea | 1691 | dw->regs = regs; |
a9ddb575 VK |
1692 | dw->sd = pdata->sd; |
1693 | dw->sd_count = pdata->sd_count; | |
482c67ea | 1694 | |
4a63a8b3 | 1695 | /* get hardware configuration parameters */ |
a0982004 | 1696 | if (autocfg) { |
4a63a8b3 AS |
1697 | max_blk_size = dma_readl(dw, MAX_BLK_SIZE); |
1698 | ||
a0982004 AS |
1699 | dw->nr_masters = (dw_params >> DW_PARAMS_NR_MASTER & 3) + 1; |
1700 | for (i = 0; i < dw->nr_masters; i++) { | |
1701 | dw->data_width[i] = | |
1702 | (dw_params >> DW_PARAMS_DATA_WIDTH(i) & 3) + 2; | |
1703 | } | |
1704 | } else { | |
1705 | dw->nr_masters = pdata->nr_masters; | |
1706 | memcpy(dw->data_width, pdata->data_width, 4); | |
1707 | } | |
1708 | ||
11f932ec | 1709 | /* Calculate all channel mask before DMA setup */ |
482c67ea | 1710 | dw->all_chan_mask = (1 << nr_channels) - 1; |
11f932ec | 1711 | |
3bfb1d20 HS |
1712 | /* force dma off, just in case */ |
1713 | dw_dma_off(dw); | |
1714 | ||
236b106f AS |
1715 | /* disable BLOCK interrupts as well */ |
1716 | channel_clear_bit(dw, MASK.BLOCK, dw->all_chan_mask); | |
1717 | ||
dbde5c29 AS |
1718 | err = devm_request_irq(&pdev->dev, irq, dw_dma_interrupt, 0, |
1719 | "dw_dmac", dw); | |
3bfb1d20 | 1720 | if (err) |
dbde5c29 | 1721 | return err; |
3bfb1d20 HS |
1722 | |
1723 | platform_set_drvdata(pdev, dw); | |
1724 | ||
1725 | tasklet_init(&dw->tasklet, dw_dma_tasklet, (unsigned long)dw); | |
1726 | ||
3bfb1d20 | 1727 | INIT_LIST_HEAD(&dw->dma.channels); |
482c67ea | 1728 | for (i = 0; i < nr_channels; i++) { |
3bfb1d20 | 1729 | struct dw_dma_chan *dwc = &dw->chan[i]; |
fed2574b | 1730 | int r = nr_channels - i - 1; |
3bfb1d20 HS |
1731 | |
1732 | dwc->chan.device = &dw->dma; | |
d3ee98cd | 1733 | dma_cookie_init(&dwc->chan); |
b0c3130d VK |
1734 | if (pdata->chan_allocation_order == CHAN_ALLOCATION_ASCENDING) |
1735 | list_add_tail(&dwc->chan.device_node, | |
1736 | &dw->dma.channels); | |
1737 | else | |
1738 | list_add(&dwc->chan.device_node, &dw->dma.channels); | |
3bfb1d20 | 1739 | |
93317e8e VK |
1740 | /* 7 is highest priority & 0 is lowest. */ |
1741 | if (pdata->chan_priority == CHAN_PRIORITY_ASCENDING) | |
fed2574b | 1742 | dwc->priority = r; |
93317e8e VK |
1743 | else |
1744 | dwc->priority = i; | |
1745 | ||
3bfb1d20 HS |
1746 | dwc->ch_regs = &__dw_regs(dw)->CHAN[i]; |
1747 | spin_lock_init(&dwc->lock); | |
1748 | dwc->mask = 1 << i; | |
1749 | ||
1750 | INIT_LIST_HEAD(&dwc->active_list); | |
1751 | INIT_LIST_HEAD(&dwc->queue); | |
1752 | INIT_LIST_HEAD(&dwc->free_list); | |
1753 | ||
1754 | channel_clear_bit(dw, CH_EN, dwc->mask); | |
4a63a8b3 | 1755 | |
0fdb567f | 1756 | dwc->direction = DMA_TRANS_NONE; |
a0982004 | 1757 | |
4a63a8b3 | 1758 | /* hardware configuration */ |
fed2574b AS |
1759 | if (autocfg) { |
1760 | unsigned int dwc_params; | |
1761 | ||
1762 | dwc_params = dma_read_byaddr(regs + r * sizeof(u32), | |
1763 | DWC_PARAMS); | |
1764 | ||
4a63a8b3 AS |
1765 | /* Decode maximum block size for given channel. The |
1766 | * stored 4 bit value represents blocks from 0x00 for 3 | |
1767 | * up to 0x0a for 4095. */ | |
1768 | dwc->block_size = | |
1769 | (4 << ((max_blk_size >> 4 * i) & 0xf)) - 1; | |
fed2574b AS |
1770 | dwc->nollp = |
1771 | (dwc_params >> DWC_PARAMS_MBLK_EN & 0x1) == 0; | |
1772 | } else { | |
4a63a8b3 | 1773 | dwc->block_size = pdata->block_size; |
fed2574b AS |
1774 | |
1775 | /* Check if channel supports multi block transfer */ | |
1776 | channel_writel(dwc, LLP, 0xfffffffc); | |
1777 | dwc->nollp = | |
1778 | (channel_readl(dwc, LLP) & 0xfffffffc) == 0; | |
1779 | channel_writel(dwc, LLP, 0); | |
1780 | } | |
3bfb1d20 HS |
1781 | } |
1782 | ||
11f932ec | 1783 | /* Clear all interrupts on all channels. */ |
3bfb1d20 | 1784 | dma_writel(dw, CLEAR.XFER, dw->all_chan_mask); |
236b106f | 1785 | dma_writel(dw, CLEAR.BLOCK, dw->all_chan_mask); |
3bfb1d20 HS |
1786 | dma_writel(dw, CLEAR.SRC_TRAN, dw->all_chan_mask); |
1787 | dma_writel(dw, CLEAR.DST_TRAN, dw->all_chan_mask); | |
1788 | dma_writel(dw, CLEAR.ERROR, dw->all_chan_mask); | |
1789 | ||
3bfb1d20 HS |
1790 | dma_cap_set(DMA_MEMCPY, dw->dma.cap_mask); |
1791 | dma_cap_set(DMA_SLAVE, dw->dma.cap_mask); | |
95ea759e JI |
1792 | if (pdata->is_private) |
1793 | dma_cap_set(DMA_PRIVATE, dw->dma.cap_mask); | |
3bfb1d20 HS |
1794 | dw->dma.dev = &pdev->dev; |
1795 | dw->dma.device_alloc_chan_resources = dwc_alloc_chan_resources; | |
1796 | dw->dma.device_free_chan_resources = dwc_free_chan_resources; | |
1797 | ||
1798 | dw->dma.device_prep_dma_memcpy = dwc_prep_dma_memcpy; | |
1799 | ||
1800 | dw->dma.device_prep_slave_sg = dwc_prep_slave_sg; | |
c3635c78 | 1801 | dw->dma.device_control = dwc_control; |
3bfb1d20 | 1802 | |
07934481 | 1803 | dw->dma.device_tx_status = dwc_tx_status; |
3bfb1d20 HS |
1804 | dw->dma.device_issue_pending = dwc_issue_pending; |
1805 | ||
1806 | dma_writel(dw, CFG, DW_CFG_DMA_EN); | |
1807 | ||
21d43f49 AS |
1808 | dev_info(&pdev->dev, "DesignWare DMA Controller, %d channels\n", |
1809 | nr_channels); | |
3bfb1d20 HS |
1810 | |
1811 | dma_async_device_register(&dw->dma); | |
1812 | ||
1813 | return 0; | |
3bfb1d20 HS |
1814 | } |
1815 | ||
0272e93f | 1816 | static int __devexit dw_remove(struct platform_device *pdev) |
3bfb1d20 HS |
1817 | { |
1818 | struct dw_dma *dw = platform_get_drvdata(pdev); | |
1819 | struct dw_dma_chan *dwc, *_dwc; | |
3bfb1d20 HS |
1820 | |
1821 | dw_dma_off(dw); | |
1822 | dma_async_device_unregister(&dw->dma); | |
1823 | ||
3bfb1d20 HS |
1824 | tasklet_kill(&dw->tasklet); |
1825 | ||
1826 | list_for_each_entry_safe(dwc, _dwc, &dw->dma.channels, | |
1827 | chan.device_node) { | |
1828 | list_del(&dwc->chan.device_node); | |
1829 | channel_clear_bit(dw, CH_EN, dwc->mask); | |
1830 | } | |
1831 | ||
3bfb1d20 HS |
1832 | return 0; |
1833 | } | |
1834 | ||
1835 | static void dw_shutdown(struct platform_device *pdev) | |
1836 | { | |
1837 | struct dw_dma *dw = platform_get_drvdata(pdev); | |
1838 | ||
6168d567 | 1839 | dw_dma_off(dw); |
3075528d | 1840 | clk_disable_unprepare(dw->clk); |
3bfb1d20 HS |
1841 | } |
1842 | ||
4a256b5f | 1843 | static int dw_suspend_noirq(struct device *dev) |
3bfb1d20 | 1844 | { |
4a256b5f | 1845 | struct platform_device *pdev = to_platform_device(dev); |
3bfb1d20 HS |
1846 | struct dw_dma *dw = platform_get_drvdata(pdev); |
1847 | ||
6168d567 | 1848 | dw_dma_off(dw); |
3075528d | 1849 | clk_disable_unprepare(dw->clk); |
61e183f8 | 1850 | |
3bfb1d20 HS |
1851 | return 0; |
1852 | } | |
1853 | ||
4a256b5f | 1854 | static int dw_resume_noirq(struct device *dev) |
3bfb1d20 | 1855 | { |
4a256b5f | 1856 | struct platform_device *pdev = to_platform_device(dev); |
3bfb1d20 HS |
1857 | struct dw_dma *dw = platform_get_drvdata(pdev); |
1858 | ||
3075528d | 1859 | clk_prepare_enable(dw->clk); |
3bfb1d20 | 1860 | dma_writel(dw, CFG, DW_CFG_DMA_EN); |
b801479b | 1861 | |
3bfb1d20 | 1862 | return 0; |
3bfb1d20 HS |
1863 | } |
1864 | ||
47145210 | 1865 | static const struct dev_pm_ops dw_dev_pm_ops = { |
4a256b5f MD |
1866 | .suspend_noirq = dw_suspend_noirq, |
1867 | .resume_noirq = dw_resume_noirq, | |
7414a1b8 RK |
1868 | .freeze_noirq = dw_suspend_noirq, |
1869 | .thaw_noirq = dw_resume_noirq, | |
1870 | .restore_noirq = dw_resume_noirq, | |
1871 | .poweroff_noirq = dw_suspend_noirq, | |
4a256b5f MD |
1872 | }; |
1873 | ||
d3f797d9 VK |
1874 | #ifdef CONFIG_OF |
1875 | static const struct of_device_id dw_dma_id_table[] = { | |
1876 | { .compatible = "snps,dma-spear1340" }, | |
1877 | {} | |
1878 | }; | |
1879 | MODULE_DEVICE_TABLE(of, dw_dma_id_table); | |
1880 | #endif | |
1881 | ||
3bfb1d20 | 1882 | static struct platform_driver dw_driver = { |
01126856 | 1883 | .probe = dw_probe, |
a7d6e3ec | 1884 | .remove = dw_remove, |
3bfb1d20 | 1885 | .shutdown = dw_shutdown, |
3bfb1d20 HS |
1886 | .driver = { |
1887 | .name = "dw_dmac", | |
4a256b5f | 1888 | .pm = &dw_dev_pm_ops, |
d3f797d9 | 1889 | .of_match_table = of_match_ptr(dw_dma_id_table), |
3bfb1d20 HS |
1890 | }, |
1891 | }; | |
1892 | ||
1893 | static int __init dw_init(void) | |
1894 | { | |
01126856 | 1895 | return platform_driver_register(&dw_driver); |
3bfb1d20 | 1896 | } |
cb689a70 | 1897 | subsys_initcall(dw_init); |
3bfb1d20 HS |
1898 | |
1899 | static void __exit dw_exit(void) | |
1900 | { | |
1901 | platform_driver_unregister(&dw_driver); | |
1902 | } | |
1903 | module_exit(dw_exit); | |
1904 | ||
1905 | MODULE_LICENSE("GPL v2"); | |
1906 | MODULE_DESCRIPTION("Synopsys DesignWare DMA Controller driver"); | |
e05503ef | 1907 | MODULE_AUTHOR("Haavard Skinnemoen (Atmel)"); |
10d8935f | 1908 | MODULE_AUTHOR("Viresh Kumar <viresh.linux@gmail.com>"); |