Commit | Line | Data |
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3bfb1d20 HS |
1 | /* |
2 | * Driver for the Synopsys DesignWare DMA Controller (aka DMACA on | |
3 | * AVR32 systems.) | |
4 | * | |
5 | * Copyright (C) 2007-2008 Atmel Corporation | |
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 | */ | |
11 | #include <linux/clk.h> | |
12 | #include <linux/delay.h> | |
13 | #include <linux/dmaengine.h> | |
14 | #include <linux/dma-mapping.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/interrupt.h> | |
17 | #include <linux/io.h> | |
18 | #include <linux/mm.h> | |
19 | #include <linux/module.h> | |
20 | #include <linux/platform_device.h> | |
21 | #include <linux/slab.h> | |
22 | ||
23 | #include "dw_dmac_regs.h" | |
24 | ||
25 | /* | |
26 | * This supports the Synopsys "DesignWare AHB Central DMA Controller", | |
27 | * (DW_ahb_dmac) which is used with various AMBA 2.0 systems (not all | |
28 | * of which use ARM any more). See the "Databook" from Synopsys for | |
29 | * information beyond what licensees probably provide. | |
30 | * | |
31 | * The driver has currently been tested only with the Atmel AT32AP7000, | |
32 | * which does not support descriptor writeback. | |
33 | */ | |
34 | ||
35 | /* NOTE: DMS+SMS is system-specific. We should get this information | |
36 | * from the platform code somehow. | |
37 | */ | |
38 | #define DWC_DEFAULT_CTLLO (DWC_CTLL_DST_MSIZE(0) \ | |
39 | | DWC_CTLL_SRC_MSIZE(0) \ | |
40 | | DWC_CTLL_DMS(0) \ | |
41 | | DWC_CTLL_SMS(1) \ | |
42 | | DWC_CTLL_LLP_D_EN \ | |
43 | | DWC_CTLL_LLP_S_EN) | |
44 | ||
45 | /* | |
46 | * This is configuration-dependent and usually a funny size like 4095. | |
47 | * Let's round it down to the nearest power of two. | |
48 | * | |
49 | * Note that this is a transfer count, i.e. if we transfer 32-bit | |
50 | * words, we can do 8192 bytes per descriptor. | |
51 | * | |
52 | * This parameter is also system-specific. | |
53 | */ | |
54 | #define DWC_MAX_COUNT 2048U | |
55 | ||
56 | /* | |
57 | * Number of descriptors to allocate for each channel. This should be | |
58 | * made configurable somehow; preferably, the clients (at least the | |
59 | * ones using slave transfers) should be able to give us a hint. | |
60 | */ | |
61 | #define NR_DESCS_PER_CHANNEL 64 | |
62 | ||
63 | /*----------------------------------------------------------------------*/ | |
64 | ||
65 | /* | |
66 | * Because we're not relying on writeback from the controller (it may not | |
67 | * even be configured into the core!) we don't need to use dma_pool. These | |
68 | * descriptors -- and associated data -- are cacheable. We do need to make | |
69 | * sure their dcache entries are written back before handing them off to | |
70 | * the controller, though. | |
71 | */ | |
72 | ||
41d5e59c DW |
73 | static struct device *chan2dev(struct dma_chan *chan) |
74 | { | |
75 | return &chan->dev->device; | |
76 | } | |
77 | static struct device *chan2parent(struct dma_chan *chan) | |
78 | { | |
79 | return chan->dev->device.parent; | |
80 | } | |
81 | ||
3bfb1d20 HS |
82 | static struct dw_desc *dwc_first_active(struct dw_dma_chan *dwc) |
83 | { | |
84 | return list_entry(dwc->active_list.next, struct dw_desc, desc_node); | |
85 | } | |
86 | ||
87 | static struct dw_desc *dwc_first_queued(struct dw_dma_chan *dwc) | |
88 | { | |
89 | return list_entry(dwc->queue.next, struct dw_desc, desc_node); | |
90 | } | |
91 | ||
92 | static struct dw_desc *dwc_desc_get(struct dw_dma_chan *dwc) | |
93 | { | |
94 | struct dw_desc *desc, *_desc; | |
95 | struct dw_desc *ret = NULL; | |
96 | unsigned int i = 0; | |
97 | ||
98 | spin_lock_bh(&dwc->lock); | |
99 | list_for_each_entry_safe(desc, _desc, &dwc->free_list, desc_node) { | |
100 | if (async_tx_test_ack(&desc->txd)) { | |
101 | list_del(&desc->desc_node); | |
102 | ret = desc; | |
103 | break; | |
104 | } | |
41d5e59c | 105 | dev_dbg(chan2dev(&dwc->chan), "desc %p not ACKed\n", desc); |
3bfb1d20 HS |
106 | i++; |
107 | } | |
108 | spin_unlock_bh(&dwc->lock); | |
109 | ||
41d5e59c | 110 | dev_vdbg(chan2dev(&dwc->chan), "scanned %u descriptors on freelist\n", i); |
3bfb1d20 HS |
111 | |
112 | return ret; | |
113 | } | |
114 | ||
115 | static void dwc_sync_desc_for_cpu(struct dw_dma_chan *dwc, struct dw_desc *desc) | |
116 | { | |
117 | struct dw_desc *child; | |
118 | ||
e0bd0f8c | 119 | list_for_each_entry(child, &desc->tx_list, desc_node) |
41d5e59c | 120 | dma_sync_single_for_cpu(chan2parent(&dwc->chan), |
3bfb1d20 HS |
121 | child->txd.phys, sizeof(child->lli), |
122 | DMA_TO_DEVICE); | |
41d5e59c | 123 | dma_sync_single_for_cpu(chan2parent(&dwc->chan), |
3bfb1d20 HS |
124 | desc->txd.phys, sizeof(desc->lli), |
125 | DMA_TO_DEVICE); | |
126 | } | |
127 | ||
128 | /* | |
129 | * Move a descriptor, including any children, to the free list. | |
130 | * `desc' must not be on any lists. | |
131 | */ | |
132 | static void dwc_desc_put(struct dw_dma_chan *dwc, struct dw_desc *desc) | |
133 | { | |
134 | if (desc) { | |
135 | struct dw_desc *child; | |
136 | ||
137 | dwc_sync_desc_for_cpu(dwc, desc); | |
138 | ||
139 | spin_lock_bh(&dwc->lock); | |
e0bd0f8c | 140 | list_for_each_entry(child, &desc->tx_list, desc_node) |
41d5e59c | 141 | dev_vdbg(chan2dev(&dwc->chan), |
3bfb1d20 HS |
142 | "moving child desc %p to freelist\n", |
143 | child); | |
e0bd0f8c | 144 | list_splice_init(&desc->tx_list, &dwc->free_list); |
41d5e59c | 145 | dev_vdbg(chan2dev(&dwc->chan), "moving desc %p to freelist\n", desc); |
3bfb1d20 HS |
146 | list_add(&desc->desc_node, &dwc->free_list); |
147 | spin_unlock_bh(&dwc->lock); | |
148 | } | |
149 | } | |
150 | ||
151 | /* Called with dwc->lock held and bh disabled */ | |
152 | static dma_cookie_t | |
153 | dwc_assign_cookie(struct dw_dma_chan *dwc, struct dw_desc *desc) | |
154 | { | |
155 | dma_cookie_t cookie = dwc->chan.cookie; | |
156 | ||
157 | if (++cookie < 0) | |
158 | cookie = 1; | |
159 | ||
160 | dwc->chan.cookie = cookie; | |
161 | desc->txd.cookie = cookie; | |
162 | ||
163 | return cookie; | |
164 | } | |
165 | ||
166 | /*----------------------------------------------------------------------*/ | |
167 | ||
168 | /* Called with dwc->lock held and bh disabled */ | |
169 | static void dwc_dostart(struct dw_dma_chan *dwc, struct dw_desc *first) | |
170 | { | |
171 | struct dw_dma *dw = to_dw_dma(dwc->chan.device); | |
172 | ||
173 | /* ASSERT: channel is idle */ | |
174 | if (dma_readl(dw, CH_EN) & dwc->mask) { | |
41d5e59c | 175 | dev_err(chan2dev(&dwc->chan), |
3bfb1d20 | 176 | "BUG: Attempted to start non-idle channel\n"); |
41d5e59c | 177 | dev_err(chan2dev(&dwc->chan), |
3bfb1d20 HS |
178 | " SAR: 0x%x DAR: 0x%x LLP: 0x%x CTL: 0x%x:%08x\n", |
179 | channel_readl(dwc, SAR), | |
180 | channel_readl(dwc, DAR), | |
181 | channel_readl(dwc, LLP), | |
182 | channel_readl(dwc, CTL_HI), | |
183 | channel_readl(dwc, CTL_LO)); | |
184 | ||
185 | /* The tasklet will hopefully advance the queue... */ | |
186 | return; | |
187 | } | |
188 | ||
189 | channel_writel(dwc, LLP, first->txd.phys); | |
190 | channel_writel(dwc, CTL_LO, | |
191 | DWC_CTLL_LLP_D_EN | DWC_CTLL_LLP_S_EN); | |
192 | channel_writel(dwc, CTL_HI, 0); | |
193 | channel_set_bit(dw, CH_EN, dwc->mask); | |
194 | } | |
195 | ||
196 | /*----------------------------------------------------------------------*/ | |
197 | ||
198 | static void | |
199 | dwc_descriptor_complete(struct dw_dma_chan *dwc, struct dw_desc *desc) | |
200 | { | |
201 | dma_async_tx_callback callback; | |
202 | void *param; | |
203 | struct dma_async_tx_descriptor *txd = &desc->txd; | |
204 | ||
41d5e59c | 205 | dev_vdbg(chan2dev(&dwc->chan), "descriptor %u complete\n", txd->cookie); |
3bfb1d20 HS |
206 | |
207 | dwc->completed = txd->cookie; | |
208 | callback = txd->callback; | |
209 | param = txd->callback_param; | |
210 | ||
211 | dwc_sync_desc_for_cpu(dwc, desc); | |
e0bd0f8c | 212 | list_splice_init(&desc->tx_list, &dwc->free_list); |
3bfb1d20 HS |
213 | list_move(&desc->desc_node, &dwc->free_list); |
214 | ||
657a77fa AN |
215 | if (!dwc->chan.private) { |
216 | struct device *parent = chan2parent(&dwc->chan); | |
217 | if (!(txd->flags & DMA_COMPL_SKIP_DEST_UNMAP)) { | |
218 | if (txd->flags & DMA_COMPL_DEST_UNMAP_SINGLE) | |
219 | dma_unmap_single(parent, desc->lli.dar, | |
220 | desc->len, DMA_FROM_DEVICE); | |
221 | else | |
222 | dma_unmap_page(parent, desc->lli.dar, | |
223 | desc->len, DMA_FROM_DEVICE); | |
224 | } | |
225 | if (!(txd->flags & DMA_COMPL_SKIP_SRC_UNMAP)) { | |
226 | if (txd->flags & DMA_COMPL_SRC_UNMAP_SINGLE) | |
227 | dma_unmap_single(parent, desc->lli.sar, | |
228 | desc->len, DMA_TO_DEVICE); | |
229 | else | |
230 | dma_unmap_page(parent, desc->lli.sar, | |
231 | desc->len, DMA_TO_DEVICE); | |
232 | } | |
233 | } | |
3bfb1d20 HS |
234 | |
235 | /* | |
236 | * The API requires that no submissions are done from a | |
237 | * callback, so we don't need to drop the lock here | |
238 | */ | |
239 | if (callback) | |
240 | callback(param); | |
241 | } | |
242 | ||
243 | static void dwc_complete_all(struct dw_dma *dw, struct dw_dma_chan *dwc) | |
244 | { | |
245 | struct dw_desc *desc, *_desc; | |
246 | LIST_HEAD(list); | |
247 | ||
248 | if (dma_readl(dw, CH_EN) & dwc->mask) { | |
41d5e59c | 249 | dev_err(chan2dev(&dwc->chan), |
3bfb1d20 HS |
250 | "BUG: XFER bit set, but channel not idle!\n"); |
251 | ||
252 | /* Try to continue after resetting the channel... */ | |
253 | channel_clear_bit(dw, CH_EN, dwc->mask); | |
254 | while (dma_readl(dw, CH_EN) & dwc->mask) | |
255 | cpu_relax(); | |
256 | } | |
257 | ||
258 | /* | |
259 | * Submit queued descriptors ASAP, i.e. before we go through | |
260 | * the completed ones. | |
261 | */ | |
262 | if (!list_empty(&dwc->queue)) | |
263 | dwc_dostart(dwc, dwc_first_queued(dwc)); | |
264 | list_splice_init(&dwc->active_list, &list); | |
265 | list_splice_init(&dwc->queue, &dwc->active_list); | |
266 | ||
267 | list_for_each_entry_safe(desc, _desc, &list, desc_node) | |
268 | dwc_descriptor_complete(dwc, desc); | |
269 | } | |
270 | ||
271 | static void dwc_scan_descriptors(struct dw_dma *dw, struct dw_dma_chan *dwc) | |
272 | { | |
273 | dma_addr_t llp; | |
274 | struct dw_desc *desc, *_desc; | |
275 | struct dw_desc *child; | |
276 | u32 status_xfer; | |
277 | ||
278 | /* | |
279 | * Clear block interrupt flag before scanning so that we don't | |
280 | * miss any, and read LLP before RAW_XFER to ensure it is | |
281 | * valid if we decide to scan the list. | |
282 | */ | |
283 | dma_writel(dw, CLEAR.BLOCK, dwc->mask); | |
284 | llp = channel_readl(dwc, LLP); | |
285 | status_xfer = dma_readl(dw, RAW.XFER); | |
286 | ||
287 | if (status_xfer & dwc->mask) { | |
288 | /* Everything we've submitted is done */ | |
289 | dma_writel(dw, CLEAR.XFER, dwc->mask); | |
290 | dwc_complete_all(dw, dwc); | |
291 | return; | |
292 | } | |
293 | ||
087809fc JI |
294 | if (list_empty(&dwc->active_list)) |
295 | return; | |
296 | ||
41d5e59c | 297 | dev_vdbg(chan2dev(&dwc->chan), "scan_descriptors: llp=0x%x\n", llp); |
3bfb1d20 HS |
298 | |
299 | list_for_each_entry_safe(desc, _desc, &dwc->active_list, desc_node) { | |
300 | if (desc->lli.llp == llp) | |
301 | /* This one is currently in progress */ | |
302 | return; | |
303 | ||
e0bd0f8c | 304 | list_for_each_entry(child, &desc->tx_list, desc_node) |
3bfb1d20 HS |
305 | if (child->lli.llp == llp) |
306 | /* Currently in progress */ | |
307 | return; | |
308 | ||
309 | /* | |
310 | * No descriptors so far seem to be in progress, i.e. | |
311 | * this one must be done. | |
312 | */ | |
313 | dwc_descriptor_complete(dwc, desc); | |
314 | } | |
315 | ||
41d5e59c | 316 | dev_err(chan2dev(&dwc->chan), |
3bfb1d20 HS |
317 | "BUG: All descriptors done, but channel not idle!\n"); |
318 | ||
319 | /* Try to continue after resetting the channel... */ | |
320 | channel_clear_bit(dw, CH_EN, dwc->mask); | |
321 | while (dma_readl(dw, CH_EN) & dwc->mask) | |
322 | cpu_relax(); | |
323 | ||
324 | if (!list_empty(&dwc->queue)) { | |
325 | dwc_dostart(dwc, dwc_first_queued(dwc)); | |
326 | list_splice_init(&dwc->queue, &dwc->active_list); | |
327 | } | |
328 | } | |
329 | ||
330 | static void dwc_dump_lli(struct dw_dma_chan *dwc, struct dw_lli *lli) | |
331 | { | |
41d5e59c | 332 | dev_printk(KERN_CRIT, chan2dev(&dwc->chan), |
3bfb1d20 HS |
333 | " desc: s0x%x d0x%x l0x%x c0x%x:%x\n", |
334 | lli->sar, lli->dar, lli->llp, | |
335 | lli->ctlhi, lli->ctllo); | |
336 | } | |
337 | ||
338 | static void dwc_handle_error(struct dw_dma *dw, struct dw_dma_chan *dwc) | |
339 | { | |
340 | struct dw_desc *bad_desc; | |
341 | struct dw_desc *child; | |
342 | ||
343 | dwc_scan_descriptors(dw, dwc); | |
344 | ||
345 | /* | |
346 | * The descriptor currently at the head of the active list is | |
347 | * borked. Since we don't have any way to report errors, we'll | |
348 | * just have to scream loudly and try to carry on. | |
349 | */ | |
350 | bad_desc = dwc_first_active(dwc); | |
351 | list_del_init(&bad_desc->desc_node); | |
352 | list_splice_init(&dwc->queue, dwc->active_list.prev); | |
353 | ||
354 | /* Clear the error flag and try to restart the controller */ | |
355 | dma_writel(dw, CLEAR.ERROR, dwc->mask); | |
356 | if (!list_empty(&dwc->active_list)) | |
357 | dwc_dostart(dwc, dwc_first_active(dwc)); | |
358 | ||
359 | /* | |
360 | * KERN_CRITICAL may seem harsh, but since this only happens | |
361 | * when someone submits a bad physical address in a | |
362 | * descriptor, we should consider ourselves lucky that the | |
363 | * controller flagged an error instead of scribbling over | |
364 | * random memory locations. | |
365 | */ | |
41d5e59c | 366 | dev_printk(KERN_CRIT, chan2dev(&dwc->chan), |
3bfb1d20 | 367 | "Bad descriptor submitted for DMA!\n"); |
41d5e59c | 368 | dev_printk(KERN_CRIT, chan2dev(&dwc->chan), |
3bfb1d20 HS |
369 | " cookie: %d\n", bad_desc->txd.cookie); |
370 | dwc_dump_lli(dwc, &bad_desc->lli); | |
e0bd0f8c | 371 | list_for_each_entry(child, &bad_desc->tx_list, desc_node) |
3bfb1d20 HS |
372 | dwc_dump_lli(dwc, &child->lli); |
373 | ||
374 | /* Pretend the descriptor completed successfully */ | |
375 | dwc_descriptor_complete(dwc, bad_desc); | |
376 | } | |
377 | ||
d9de4519 HCE |
378 | /* --------------------- Cyclic DMA API extensions -------------------- */ |
379 | ||
380 | inline dma_addr_t dw_dma_get_src_addr(struct dma_chan *chan) | |
381 | { | |
382 | struct dw_dma_chan *dwc = to_dw_dma_chan(chan); | |
383 | return channel_readl(dwc, SAR); | |
384 | } | |
385 | EXPORT_SYMBOL(dw_dma_get_src_addr); | |
386 | ||
387 | inline dma_addr_t dw_dma_get_dst_addr(struct dma_chan *chan) | |
388 | { | |
389 | struct dw_dma_chan *dwc = to_dw_dma_chan(chan); | |
390 | return channel_readl(dwc, DAR); | |
391 | } | |
392 | EXPORT_SYMBOL(dw_dma_get_dst_addr); | |
393 | ||
394 | /* called with dwc->lock held and all DMAC interrupts disabled */ | |
395 | static void dwc_handle_cyclic(struct dw_dma *dw, struct dw_dma_chan *dwc, | |
396 | u32 status_block, u32 status_err, u32 status_xfer) | |
397 | { | |
398 | if (status_block & dwc->mask) { | |
399 | void (*callback)(void *param); | |
400 | void *callback_param; | |
401 | ||
402 | dev_vdbg(chan2dev(&dwc->chan), "new cyclic period llp 0x%08x\n", | |
403 | channel_readl(dwc, LLP)); | |
404 | dma_writel(dw, CLEAR.BLOCK, dwc->mask); | |
405 | ||
406 | callback = dwc->cdesc->period_callback; | |
407 | callback_param = dwc->cdesc->period_callback_param; | |
408 | if (callback) { | |
409 | spin_unlock(&dwc->lock); | |
410 | callback(callback_param); | |
411 | spin_lock(&dwc->lock); | |
412 | } | |
413 | } | |
414 | ||
415 | /* | |
416 | * Error and transfer complete are highly unlikely, and will most | |
417 | * likely be due to a configuration error by the user. | |
418 | */ | |
419 | if (unlikely(status_err & dwc->mask) || | |
420 | unlikely(status_xfer & dwc->mask)) { | |
421 | int i; | |
422 | ||
423 | dev_err(chan2dev(&dwc->chan), "cyclic DMA unexpected %s " | |
424 | "interrupt, stopping DMA transfer\n", | |
425 | status_xfer ? "xfer" : "error"); | |
426 | dev_err(chan2dev(&dwc->chan), | |
427 | " SAR: 0x%x DAR: 0x%x LLP: 0x%x CTL: 0x%x:%08x\n", | |
428 | channel_readl(dwc, SAR), | |
429 | channel_readl(dwc, DAR), | |
430 | channel_readl(dwc, LLP), | |
431 | channel_readl(dwc, CTL_HI), | |
432 | channel_readl(dwc, CTL_LO)); | |
433 | ||
434 | channel_clear_bit(dw, CH_EN, dwc->mask); | |
435 | while (dma_readl(dw, CH_EN) & dwc->mask) | |
436 | cpu_relax(); | |
437 | ||
438 | /* make sure DMA does not restart by loading a new list */ | |
439 | channel_writel(dwc, LLP, 0); | |
440 | channel_writel(dwc, CTL_LO, 0); | |
441 | channel_writel(dwc, CTL_HI, 0); | |
442 | ||
443 | dma_writel(dw, CLEAR.BLOCK, dwc->mask); | |
444 | dma_writel(dw, CLEAR.ERROR, dwc->mask); | |
445 | dma_writel(dw, CLEAR.XFER, dwc->mask); | |
446 | ||
447 | for (i = 0; i < dwc->cdesc->periods; i++) | |
448 | dwc_dump_lli(dwc, &dwc->cdesc->desc[i]->lli); | |
449 | } | |
450 | } | |
451 | ||
452 | /* ------------------------------------------------------------------------- */ | |
453 | ||
3bfb1d20 HS |
454 | static void dw_dma_tasklet(unsigned long data) |
455 | { | |
456 | struct dw_dma *dw = (struct dw_dma *)data; | |
457 | struct dw_dma_chan *dwc; | |
458 | u32 status_block; | |
459 | u32 status_xfer; | |
460 | u32 status_err; | |
461 | int i; | |
462 | ||
463 | status_block = dma_readl(dw, RAW.BLOCK); | |
7fe7b2f4 | 464 | status_xfer = dma_readl(dw, RAW.XFER); |
3bfb1d20 HS |
465 | status_err = dma_readl(dw, RAW.ERROR); |
466 | ||
467 | dev_vdbg(dw->dma.dev, "tasklet: status_block=%x status_err=%x\n", | |
468 | status_block, status_err); | |
469 | ||
470 | for (i = 0; i < dw->dma.chancnt; i++) { | |
471 | dwc = &dw->chan[i]; | |
472 | spin_lock(&dwc->lock); | |
d9de4519 HCE |
473 | if (test_bit(DW_DMA_IS_CYCLIC, &dwc->flags)) |
474 | dwc_handle_cyclic(dw, dwc, status_block, status_err, | |
475 | status_xfer); | |
476 | else if (status_err & (1 << i)) | |
3bfb1d20 HS |
477 | dwc_handle_error(dw, dwc); |
478 | else if ((status_block | status_xfer) & (1 << i)) | |
479 | dwc_scan_descriptors(dw, dwc); | |
480 | spin_unlock(&dwc->lock); | |
481 | } | |
482 | ||
483 | /* | |
484 | * Re-enable interrupts. Block Complete interrupts are only | |
485 | * enabled if the INT_EN bit in the descriptor is set. This | |
486 | * will trigger a scan before the whole list is done. | |
487 | */ | |
488 | channel_set_bit(dw, MASK.XFER, dw->all_chan_mask); | |
489 | channel_set_bit(dw, MASK.BLOCK, dw->all_chan_mask); | |
490 | channel_set_bit(dw, MASK.ERROR, dw->all_chan_mask); | |
491 | } | |
492 | ||
493 | static irqreturn_t dw_dma_interrupt(int irq, void *dev_id) | |
494 | { | |
495 | struct dw_dma *dw = dev_id; | |
496 | u32 status; | |
497 | ||
498 | dev_vdbg(dw->dma.dev, "interrupt: status=0x%x\n", | |
499 | dma_readl(dw, STATUS_INT)); | |
500 | ||
501 | /* | |
502 | * Just disable the interrupts. We'll turn them back on in the | |
503 | * softirq handler. | |
504 | */ | |
505 | channel_clear_bit(dw, MASK.XFER, dw->all_chan_mask); | |
506 | channel_clear_bit(dw, MASK.BLOCK, dw->all_chan_mask); | |
507 | channel_clear_bit(dw, MASK.ERROR, dw->all_chan_mask); | |
508 | ||
509 | status = dma_readl(dw, STATUS_INT); | |
510 | if (status) { | |
511 | dev_err(dw->dma.dev, | |
512 | "BUG: Unexpected interrupts pending: 0x%x\n", | |
513 | status); | |
514 | ||
515 | /* Try to recover */ | |
516 | channel_clear_bit(dw, MASK.XFER, (1 << 8) - 1); | |
517 | channel_clear_bit(dw, MASK.BLOCK, (1 << 8) - 1); | |
518 | channel_clear_bit(dw, MASK.SRC_TRAN, (1 << 8) - 1); | |
519 | channel_clear_bit(dw, MASK.DST_TRAN, (1 << 8) - 1); | |
520 | channel_clear_bit(dw, MASK.ERROR, (1 << 8) - 1); | |
521 | } | |
522 | ||
523 | tasklet_schedule(&dw->tasklet); | |
524 | ||
525 | return IRQ_HANDLED; | |
526 | } | |
527 | ||
528 | /*----------------------------------------------------------------------*/ | |
529 | ||
530 | static dma_cookie_t dwc_tx_submit(struct dma_async_tx_descriptor *tx) | |
531 | { | |
532 | struct dw_desc *desc = txd_to_dw_desc(tx); | |
533 | struct dw_dma_chan *dwc = to_dw_dma_chan(tx->chan); | |
534 | dma_cookie_t cookie; | |
535 | ||
536 | spin_lock_bh(&dwc->lock); | |
537 | cookie = dwc_assign_cookie(dwc, desc); | |
538 | ||
539 | /* | |
540 | * REVISIT: We should attempt to chain as many descriptors as | |
541 | * possible, perhaps even appending to those already submitted | |
542 | * for DMA. But this is hard to do in a race-free manner. | |
543 | */ | |
544 | if (list_empty(&dwc->active_list)) { | |
41d5e59c | 545 | dev_vdbg(chan2dev(tx->chan), "tx_submit: started %u\n", |
3bfb1d20 HS |
546 | desc->txd.cookie); |
547 | dwc_dostart(dwc, desc); | |
548 | list_add_tail(&desc->desc_node, &dwc->active_list); | |
549 | } else { | |
41d5e59c | 550 | dev_vdbg(chan2dev(tx->chan), "tx_submit: queued %u\n", |
3bfb1d20 HS |
551 | desc->txd.cookie); |
552 | ||
553 | list_add_tail(&desc->desc_node, &dwc->queue); | |
554 | } | |
555 | ||
556 | spin_unlock_bh(&dwc->lock); | |
557 | ||
558 | return cookie; | |
559 | } | |
560 | ||
561 | static struct dma_async_tx_descriptor * | |
562 | dwc_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src, | |
563 | size_t len, unsigned long flags) | |
564 | { | |
565 | struct dw_dma_chan *dwc = to_dw_dma_chan(chan); | |
566 | struct dw_desc *desc; | |
567 | struct dw_desc *first; | |
568 | struct dw_desc *prev; | |
569 | size_t xfer_count; | |
570 | size_t offset; | |
571 | unsigned int src_width; | |
572 | unsigned int dst_width; | |
573 | u32 ctllo; | |
574 | ||
41d5e59c | 575 | dev_vdbg(chan2dev(chan), "prep_dma_memcpy d0x%x s0x%x l0x%zx f0x%lx\n", |
3bfb1d20 HS |
576 | dest, src, len, flags); |
577 | ||
578 | if (unlikely(!len)) { | |
41d5e59c | 579 | dev_dbg(chan2dev(chan), "prep_dma_memcpy: length is zero!\n"); |
3bfb1d20 HS |
580 | return NULL; |
581 | } | |
582 | ||
583 | /* | |
584 | * We can be a lot more clever here, but this should take care | |
585 | * of the most common optimization. | |
586 | */ | |
587 | if (!((src | dest | len) & 3)) | |
588 | src_width = dst_width = 2; | |
589 | else if (!((src | dest | len) & 1)) | |
590 | src_width = dst_width = 1; | |
591 | else | |
592 | src_width = dst_width = 0; | |
593 | ||
594 | ctllo = DWC_DEFAULT_CTLLO | |
595 | | DWC_CTLL_DST_WIDTH(dst_width) | |
596 | | DWC_CTLL_SRC_WIDTH(src_width) | |
597 | | DWC_CTLL_DST_INC | |
598 | | DWC_CTLL_SRC_INC | |
599 | | DWC_CTLL_FC_M2M; | |
600 | prev = first = NULL; | |
601 | ||
602 | for (offset = 0; offset < len; offset += xfer_count << src_width) { | |
603 | xfer_count = min_t(size_t, (len - offset) >> src_width, | |
604 | DWC_MAX_COUNT); | |
605 | ||
606 | desc = dwc_desc_get(dwc); | |
607 | if (!desc) | |
608 | goto err_desc_get; | |
609 | ||
610 | desc->lli.sar = src + offset; | |
611 | desc->lli.dar = dest + offset; | |
612 | desc->lli.ctllo = ctllo; | |
613 | desc->lli.ctlhi = xfer_count; | |
614 | ||
615 | if (!first) { | |
616 | first = desc; | |
617 | } else { | |
618 | prev->lli.llp = desc->txd.phys; | |
41d5e59c | 619 | dma_sync_single_for_device(chan2parent(chan), |
3bfb1d20 HS |
620 | prev->txd.phys, sizeof(prev->lli), |
621 | DMA_TO_DEVICE); | |
622 | list_add_tail(&desc->desc_node, | |
e0bd0f8c | 623 | &first->tx_list); |
3bfb1d20 HS |
624 | } |
625 | prev = desc; | |
626 | } | |
627 | ||
628 | ||
629 | if (flags & DMA_PREP_INTERRUPT) | |
630 | /* Trigger interrupt after last block */ | |
631 | prev->lli.ctllo |= DWC_CTLL_INT_EN; | |
632 | ||
633 | prev->lli.llp = 0; | |
41d5e59c | 634 | dma_sync_single_for_device(chan2parent(chan), |
3bfb1d20 HS |
635 | prev->txd.phys, sizeof(prev->lli), |
636 | DMA_TO_DEVICE); | |
637 | ||
638 | first->txd.flags = flags; | |
639 | first->len = len; | |
640 | ||
641 | return &first->txd; | |
642 | ||
643 | err_desc_get: | |
644 | dwc_desc_put(dwc, first); | |
645 | return NULL; | |
646 | } | |
647 | ||
648 | static struct dma_async_tx_descriptor * | |
649 | dwc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, | |
650 | unsigned int sg_len, enum dma_data_direction direction, | |
651 | unsigned long flags) | |
652 | { | |
653 | struct dw_dma_chan *dwc = to_dw_dma_chan(chan); | |
287d8592 | 654 | struct dw_dma_slave *dws = chan->private; |
3bfb1d20 HS |
655 | struct dw_desc *prev; |
656 | struct dw_desc *first; | |
657 | u32 ctllo; | |
658 | dma_addr_t reg; | |
659 | unsigned int reg_width; | |
660 | unsigned int mem_width; | |
661 | unsigned int i; | |
662 | struct scatterlist *sg; | |
663 | size_t total_len = 0; | |
664 | ||
41d5e59c | 665 | dev_vdbg(chan2dev(chan), "prep_dma_slave\n"); |
3bfb1d20 HS |
666 | |
667 | if (unlikely(!dws || !sg_len)) | |
668 | return NULL; | |
669 | ||
74465b4f | 670 | reg_width = dws->reg_width; |
3bfb1d20 HS |
671 | prev = first = NULL; |
672 | ||
3bfb1d20 HS |
673 | switch (direction) { |
674 | case DMA_TO_DEVICE: | |
675 | ctllo = (DWC_DEFAULT_CTLLO | |
676 | | DWC_CTLL_DST_WIDTH(reg_width) | |
677 | | DWC_CTLL_DST_FIX | |
678 | | DWC_CTLL_SRC_INC | |
679 | | DWC_CTLL_FC_M2P); | |
74465b4f | 680 | reg = dws->tx_reg; |
3bfb1d20 HS |
681 | for_each_sg(sgl, sg, sg_len, i) { |
682 | struct dw_desc *desc; | |
683 | u32 len; | |
684 | u32 mem; | |
685 | ||
686 | desc = dwc_desc_get(dwc); | |
687 | if (!desc) { | |
41d5e59c | 688 | dev_err(chan2dev(chan), |
3bfb1d20 HS |
689 | "not enough descriptors available\n"); |
690 | goto err_desc_get; | |
691 | } | |
692 | ||
693 | mem = sg_phys(sg); | |
694 | len = sg_dma_len(sg); | |
695 | mem_width = 2; | |
696 | if (unlikely(mem & 3 || len & 3)) | |
697 | mem_width = 0; | |
698 | ||
699 | desc->lli.sar = mem; | |
700 | desc->lli.dar = reg; | |
701 | desc->lli.ctllo = ctllo | DWC_CTLL_SRC_WIDTH(mem_width); | |
702 | desc->lli.ctlhi = len >> mem_width; | |
703 | ||
704 | if (!first) { | |
705 | first = desc; | |
706 | } else { | |
707 | prev->lli.llp = desc->txd.phys; | |
41d5e59c | 708 | dma_sync_single_for_device(chan2parent(chan), |
3bfb1d20 HS |
709 | prev->txd.phys, |
710 | sizeof(prev->lli), | |
711 | DMA_TO_DEVICE); | |
712 | list_add_tail(&desc->desc_node, | |
e0bd0f8c | 713 | &first->tx_list); |
3bfb1d20 HS |
714 | } |
715 | prev = desc; | |
716 | total_len += len; | |
717 | } | |
718 | break; | |
719 | case DMA_FROM_DEVICE: | |
720 | ctllo = (DWC_DEFAULT_CTLLO | |
721 | | DWC_CTLL_SRC_WIDTH(reg_width) | |
722 | | DWC_CTLL_DST_INC | |
723 | | DWC_CTLL_SRC_FIX | |
724 | | DWC_CTLL_FC_P2M); | |
725 | ||
74465b4f | 726 | reg = dws->rx_reg; |
3bfb1d20 HS |
727 | for_each_sg(sgl, sg, sg_len, i) { |
728 | struct dw_desc *desc; | |
729 | u32 len; | |
730 | u32 mem; | |
731 | ||
732 | desc = dwc_desc_get(dwc); | |
733 | if (!desc) { | |
41d5e59c | 734 | dev_err(chan2dev(chan), |
3bfb1d20 HS |
735 | "not enough descriptors available\n"); |
736 | goto err_desc_get; | |
737 | } | |
738 | ||
739 | mem = sg_phys(sg); | |
740 | len = sg_dma_len(sg); | |
741 | mem_width = 2; | |
742 | if (unlikely(mem & 3 || len & 3)) | |
743 | mem_width = 0; | |
744 | ||
745 | desc->lli.sar = reg; | |
746 | desc->lli.dar = mem; | |
747 | desc->lli.ctllo = ctllo | DWC_CTLL_DST_WIDTH(mem_width); | |
748 | desc->lli.ctlhi = len >> reg_width; | |
749 | ||
750 | if (!first) { | |
751 | first = desc; | |
752 | } else { | |
753 | prev->lli.llp = desc->txd.phys; | |
41d5e59c | 754 | dma_sync_single_for_device(chan2parent(chan), |
3bfb1d20 HS |
755 | prev->txd.phys, |
756 | sizeof(prev->lli), | |
757 | DMA_TO_DEVICE); | |
758 | list_add_tail(&desc->desc_node, | |
e0bd0f8c | 759 | &first->tx_list); |
3bfb1d20 HS |
760 | } |
761 | prev = desc; | |
762 | total_len += len; | |
763 | } | |
764 | break; | |
765 | default: | |
766 | return NULL; | |
767 | } | |
768 | ||
769 | if (flags & DMA_PREP_INTERRUPT) | |
770 | /* Trigger interrupt after last block */ | |
771 | prev->lli.ctllo |= DWC_CTLL_INT_EN; | |
772 | ||
773 | prev->lli.llp = 0; | |
41d5e59c | 774 | dma_sync_single_for_device(chan2parent(chan), |
3bfb1d20 HS |
775 | prev->txd.phys, sizeof(prev->lli), |
776 | DMA_TO_DEVICE); | |
777 | ||
778 | first->len = total_len; | |
779 | ||
780 | return &first->txd; | |
781 | ||
782 | err_desc_get: | |
783 | dwc_desc_put(dwc, first); | |
784 | return NULL; | |
785 | } | |
786 | ||
05827630 LW |
787 | static int dwc_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, |
788 | unsigned long arg) | |
3bfb1d20 HS |
789 | { |
790 | struct dw_dma_chan *dwc = to_dw_dma_chan(chan); | |
791 | struct dw_dma *dw = to_dw_dma(chan->device); | |
792 | struct dw_desc *desc, *_desc; | |
793 | LIST_HEAD(list); | |
794 | ||
c3635c78 LW |
795 | /* Only supports DMA_TERMINATE_ALL */ |
796 | if (cmd != DMA_TERMINATE_ALL) | |
797 | return -ENXIO; | |
798 | ||
3bfb1d20 HS |
799 | /* |
800 | * This is only called when something went wrong elsewhere, so | |
801 | * we don't really care about the data. Just disable the | |
802 | * channel. We still have to poll the channel enable bit due | |
803 | * to AHB/HSB limitations. | |
804 | */ | |
805 | spin_lock_bh(&dwc->lock); | |
806 | ||
807 | channel_clear_bit(dw, CH_EN, dwc->mask); | |
808 | ||
809 | while (dma_readl(dw, CH_EN) & dwc->mask) | |
810 | cpu_relax(); | |
811 | ||
812 | /* active_list entries will end up before queued entries */ | |
813 | list_splice_init(&dwc->queue, &list); | |
814 | list_splice_init(&dwc->active_list, &list); | |
815 | ||
816 | spin_unlock_bh(&dwc->lock); | |
817 | ||
818 | /* Flush all pending and queued descriptors */ | |
819 | list_for_each_entry_safe(desc, _desc, &list, desc_node) | |
820 | dwc_descriptor_complete(dwc, desc); | |
c3635c78 LW |
821 | |
822 | return 0; | |
3bfb1d20 HS |
823 | } |
824 | ||
825 | static enum dma_status | |
07934481 LW |
826 | dwc_tx_status(struct dma_chan *chan, |
827 | dma_cookie_t cookie, | |
828 | struct dma_tx_state *txstate) | |
3bfb1d20 HS |
829 | { |
830 | struct dw_dma_chan *dwc = to_dw_dma_chan(chan); | |
831 | dma_cookie_t last_used; | |
832 | dma_cookie_t last_complete; | |
833 | int ret; | |
834 | ||
835 | last_complete = dwc->completed; | |
836 | last_used = chan->cookie; | |
837 | ||
838 | ret = dma_async_is_complete(cookie, last_complete, last_used); | |
839 | if (ret != DMA_SUCCESS) { | |
840 | dwc_scan_descriptors(to_dw_dma(chan->device), dwc); | |
841 | ||
842 | last_complete = dwc->completed; | |
843 | last_used = chan->cookie; | |
844 | ||
845 | ret = dma_async_is_complete(cookie, last_complete, last_used); | |
846 | } | |
847 | ||
bca34692 | 848 | dma_set_tx_state(txstate, last_complete, last_used, 0); |
3bfb1d20 HS |
849 | |
850 | return ret; | |
851 | } | |
852 | ||
853 | static void dwc_issue_pending(struct dma_chan *chan) | |
854 | { | |
855 | struct dw_dma_chan *dwc = to_dw_dma_chan(chan); | |
856 | ||
857 | spin_lock_bh(&dwc->lock); | |
858 | if (!list_empty(&dwc->queue)) | |
859 | dwc_scan_descriptors(to_dw_dma(chan->device), dwc); | |
860 | spin_unlock_bh(&dwc->lock); | |
861 | } | |
862 | ||
aa1e6f1a | 863 | static int dwc_alloc_chan_resources(struct dma_chan *chan) |
3bfb1d20 HS |
864 | { |
865 | struct dw_dma_chan *dwc = to_dw_dma_chan(chan); | |
866 | struct dw_dma *dw = to_dw_dma(chan->device); | |
867 | struct dw_desc *desc; | |
3bfb1d20 HS |
868 | struct dw_dma_slave *dws; |
869 | int i; | |
870 | u32 cfghi; | |
871 | u32 cfglo; | |
872 | ||
41d5e59c | 873 | dev_vdbg(chan2dev(chan), "alloc_chan_resources\n"); |
3bfb1d20 | 874 | |
3bfb1d20 HS |
875 | /* ASSERT: channel is idle */ |
876 | if (dma_readl(dw, CH_EN) & dwc->mask) { | |
41d5e59c | 877 | dev_dbg(chan2dev(chan), "DMA channel not idle?\n"); |
3bfb1d20 HS |
878 | return -EIO; |
879 | } | |
880 | ||
881 | dwc->completed = chan->cookie = 1; | |
882 | ||
883 | cfghi = DWC_CFGH_FIFO_MODE; | |
884 | cfglo = 0; | |
885 | ||
287d8592 | 886 | dws = chan->private; |
74465b4f | 887 | if (dws) { |
3bfb1d20 HS |
888 | /* |
889 | * We need controller-specific data to set up slave | |
890 | * transfers. | |
891 | */ | |
74465b4f | 892 | BUG_ON(!dws->dma_dev || dws->dma_dev != dw->dma.dev); |
3bfb1d20 | 893 | |
3bfb1d20 HS |
894 | cfghi = dws->cfg_hi; |
895 | cfglo = dws->cfg_lo; | |
3bfb1d20 | 896 | } |
3bfb1d20 HS |
897 | channel_writel(dwc, CFG_LO, cfglo); |
898 | channel_writel(dwc, CFG_HI, cfghi); | |
899 | ||
900 | /* | |
901 | * NOTE: some controllers may have additional features that we | |
902 | * need to initialize here, like "scatter-gather" (which | |
903 | * doesn't mean what you think it means), and status writeback. | |
904 | */ | |
905 | ||
906 | spin_lock_bh(&dwc->lock); | |
907 | i = dwc->descs_allocated; | |
908 | while (dwc->descs_allocated < NR_DESCS_PER_CHANNEL) { | |
909 | spin_unlock_bh(&dwc->lock); | |
910 | ||
911 | desc = kzalloc(sizeof(struct dw_desc), GFP_KERNEL); | |
912 | if (!desc) { | |
41d5e59c | 913 | dev_info(chan2dev(chan), |
3bfb1d20 HS |
914 | "only allocated %d descriptors\n", i); |
915 | spin_lock_bh(&dwc->lock); | |
916 | break; | |
917 | } | |
918 | ||
e0bd0f8c | 919 | INIT_LIST_HEAD(&desc->tx_list); |
3bfb1d20 HS |
920 | dma_async_tx_descriptor_init(&desc->txd, chan); |
921 | desc->txd.tx_submit = dwc_tx_submit; | |
922 | desc->txd.flags = DMA_CTRL_ACK; | |
41d5e59c | 923 | desc->txd.phys = dma_map_single(chan2parent(chan), &desc->lli, |
3bfb1d20 HS |
924 | sizeof(desc->lli), DMA_TO_DEVICE); |
925 | dwc_desc_put(dwc, desc); | |
926 | ||
927 | spin_lock_bh(&dwc->lock); | |
928 | i = ++dwc->descs_allocated; | |
929 | } | |
930 | ||
931 | /* Enable interrupts */ | |
932 | channel_set_bit(dw, MASK.XFER, dwc->mask); | |
933 | channel_set_bit(dw, MASK.BLOCK, dwc->mask); | |
934 | channel_set_bit(dw, MASK.ERROR, dwc->mask); | |
935 | ||
936 | spin_unlock_bh(&dwc->lock); | |
937 | ||
41d5e59c | 938 | dev_dbg(chan2dev(chan), |
3bfb1d20 HS |
939 | "alloc_chan_resources allocated %d descriptors\n", i); |
940 | ||
941 | return i; | |
942 | } | |
943 | ||
944 | static void dwc_free_chan_resources(struct dma_chan *chan) | |
945 | { | |
946 | struct dw_dma_chan *dwc = to_dw_dma_chan(chan); | |
947 | struct dw_dma *dw = to_dw_dma(chan->device); | |
948 | struct dw_desc *desc, *_desc; | |
949 | LIST_HEAD(list); | |
950 | ||
41d5e59c | 951 | dev_dbg(chan2dev(chan), "free_chan_resources (descs allocated=%u)\n", |
3bfb1d20 HS |
952 | dwc->descs_allocated); |
953 | ||
954 | /* ASSERT: channel is idle */ | |
955 | BUG_ON(!list_empty(&dwc->active_list)); | |
956 | BUG_ON(!list_empty(&dwc->queue)); | |
957 | BUG_ON(dma_readl(to_dw_dma(chan->device), CH_EN) & dwc->mask); | |
958 | ||
959 | spin_lock_bh(&dwc->lock); | |
960 | list_splice_init(&dwc->free_list, &list); | |
961 | dwc->descs_allocated = 0; | |
3bfb1d20 HS |
962 | |
963 | /* Disable interrupts */ | |
964 | channel_clear_bit(dw, MASK.XFER, dwc->mask); | |
965 | channel_clear_bit(dw, MASK.BLOCK, dwc->mask); | |
966 | channel_clear_bit(dw, MASK.ERROR, dwc->mask); | |
967 | ||
968 | spin_unlock_bh(&dwc->lock); | |
969 | ||
970 | list_for_each_entry_safe(desc, _desc, &list, desc_node) { | |
41d5e59c DW |
971 | dev_vdbg(chan2dev(chan), " freeing descriptor %p\n", desc); |
972 | dma_unmap_single(chan2parent(chan), desc->txd.phys, | |
3bfb1d20 HS |
973 | sizeof(desc->lli), DMA_TO_DEVICE); |
974 | kfree(desc); | |
975 | } | |
976 | ||
41d5e59c | 977 | dev_vdbg(chan2dev(chan), "free_chan_resources done\n"); |
3bfb1d20 HS |
978 | } |
979 | ||
d9de4519 HCE |
980 | /* --------------------- Cyclic DMA API extensions -------------------- */ |
981 | ||
982 | /** | |
983 | * dw_dma_cyclic_start - start the cyclic DMA transfer | |
984 | * @chan: the DMA channel to start | |
985 | * | |
986 | * Must be called with soft interrupts disabled. Returns zero on success or | |
987 | * -errno on failure. | |
988 | */ | |
989 | int dw_dma_cyclic_start(struct dma_chan *chan) | |
990 | { | |
991 | struct dw_dma_chan *dwc = to_dw_dma_chan(chan); | |
992 | struct dw_dma *dw = to_dw_dma(dwc->chan.device); | |
993 | ||
994 | if (!test_bit(DW_DMA_IS_CYCLIC, &dwc->flags)) { | |
995 | dev_err(chan2dev(&dwc->chan), "missing prep for cyclic DMA\n"); | |
996 | return -ENODEV; | |
997 | } | |
998 | ||
999 | spin_lock(&dwc->lock); | |
1000 | ||
1001 | /* assert channel is idle */ | |
1002 | if (dma_readl(dw, CH_EN) & dwc->mask) { | |
1003 | dev_err(chan2dev(&dwc->chan), | |
1004 | "BUG: Attempted to start non-idle channel\n"); | |
1005 | dev_err(chan2dev(&dwc->chan), | |
1006 | " SAR: 0x%x DAR: 0x%x LLP: 0x%x CTL: 0x%x:%08x\n", | |
1007 | channel_readl(dwc, SAR), | |
1008 | channel_readl(dwc, DAR), | |
1009 | channel_readl(dwc, LLP), | |
1010 | channel_readl(dwc, CTL_HI), | |
1011 | channel_readl(dwc, CTL_LO)); | |
1012 | spin_unlock(&dwc->lock); | |
1013 | return -EBUSY; | |
1014 | } | |
1015 | ||
1016 | dma_writel(dw, CLEAR.BLOCK, dwc->mask); | |
1017 | dma_writel(dw, CLEAR.ERROR, dwc->mask); | |
1018 | dma_writel(dw, CLEAR.XFER, dwc->mask); | |
1019 | ||
1020 | /* setup DMAC channel registers */ | |
1021 | channel_writel(dwc, LLP, dwc->cdesc->desc[0]->txd.phys); | |
1022 | channel_writel(dwc, CTL_LO, DWC_CTLL_LLP_D_EN | DWC_CTLL_LLP_S_EN); | |
1023 | channel_writel(dwc, CTL_HI, 0); | |
1024 | ||
1025 | channel_set_bit(dw, CH_EN, dwc->mask); | |
1026 | ||
1027 | spin_unlock(&dwc->lock); | |
1028 | ||
1029 | return 0; | |
1030 | } | |
1031 | EXPORT_SYMBOL(dw_dma_cyclic_start); | |
1032 | ||
1033 | /** | |
1034 | * dw_dma_cyclic_stop - stop the cyclic DMA transfer | |
1035 | * @chan: the DMA channel to stop | |
1036 | * | |
1037 | * Must be called with soft interrupts disabled. | |
1038 | */ | |
1039 | void dw_dma_cyclic_stop(struct dma_chan *chan) | |
1040 | { | |
1041 | struct dw_dma_chan *dwc = to_dw_dma_chan(chan); | |
1042 | struct dw_dma *dw = to_dw_dma(dwc->chan.device); | |
1043 | ||
1044 | spin_lock(&dwc->lock); | |
1045 | ||
1046 | channel_clear_bit(dw, CH_EN, dwc->mask); | |
1047 | while (dma_readl(dw, CH_EN) & dwc->mask) | |
1048 | cpu_relax(); | |
1049 | ||
1050 | spin_unlock(&dwc->lock); | |
1051 | } | |
1052 | EXPORT_SYMBOL(dw_dma_cyclic_stop); | |
1053 | ||
1054 | /** | |
1055 | * dw_dma_cyclic_prep - prepare the cyclic DMA transfer | |
1056 | * @chan: the DMA channel to prepare | |
1057 | * @buf_addr: physical DMA address where the buffer starts | |
1058 | * @buf_len: total number of bytes for the entire buffer | |
1059 | * @period_len: number of bytes for each period | |
1060 | * @direction: transfer direction, to or from device | |
1061 | * | |
1062 | * Must be called before trying to start the transfer. Returns a valid struct | |
1063 | * dw_cyclic_desc if successful or an ERR_PTR(-errno) if not successful. | |
1064 | */ | |
1065 | struct dw_cyclic_desc *dw_dma_cyclic_prep(struct dma_chan *chan, | |
1066 | dma_addr_t buf_addr, size_t buf_len, size_t period_len, | |
1067 | enum dma_data_direction direction) | |
1068 | { | |
1069 | struct dw_dma_chan *dwc = to_dw_dma_chan(chan); | |
1070 | struct dw_cyclic_desc *cdesc; | |
1071 | struct dw_cyclic_desc *retval = NULL; | |
1072 | struct dw_desc *desc; | |
1073 | struct dw_desc *last = NULL; | |
1074 | struct dw_dma_slave *dws = chan->private; | |
1075 | unsigned long was_cyclic; | |
1076 | unsigned int reg_width; | |
1077 | unsigned int periods; | |
1078 | unsigned int i; | |
1079 | ||
1080 | spin_lock_bh(&dwc->lock); | |
1081 | if (!list_empty(&dwc->queue) || !list_empty(&dwc->active_list)) { | |
1082 | spin_unlock_bh(&dwc->lock); | |
1083 | dev_dbg(chan2dev(&dwc->chan), | |
1084 | "queue and/or active list are not empty\n"); | |
1085 | return ERR_PTR(-EBUSY); | |
1086 | } | |
1087 | ||
1088 | was_cyclic = test_and_set_bit(DW_DMA_IS_CYCLIC, &dwc->flags); | |
1089 | spin_unlock_bh(&dwc->lock); | |
1090 | if (was_cyclic) { | |
1091 | dev_dbg(chan2dev(&dwc->chan), | |
1092 | "channel already prepared for cyclic DMA\n"); | |
1093 | return ERR_PTR(-EBUSY); | |
1094 | } | |
1095 | ||
1096 | retval = ERR_PTR(-EINVAL); | |
1097 | reg_width = dws->reg_width; | |
1098 | periods = buf_len / period_len; | |
1099 | ||
1100 | /* Check for too big/unaligned periods and unaligned DMA buffer. */ | |
1101 | if (period_len > (DWC_MAX_COUNT << reg_width)) | |
1102 | goto out_err; | |
1103 | if (unlikely(period_len & ((1 << reg_width) - 1))) | |
1104 | goto out_err; | |
1105 | if (unlikely(buf_addr & ((1 << reg_width) - 1))) | |
1106 | goto out_err; | |
1107 | if (unlikely(!(direction & (DMA_TO_DEVICE | DMA_FROM_DEVICE)))) | |
1108 | goto out_err; | |
1109 | ||
1110 | retval = ERR_PTR(-ENOMEM); | |
1111 | ||
1112 | if (periods > NR_DESCS_PER_CHANNEL) | |
1113 | goto out_err; | |
1114 | ||
1115 | cdesc = kzalloc(sizeof(struct dw_cyclic_desc), GFP_KERNEL); | |
1116 | if (!cdesc) | |
1117 | goto out_err; | |
1118 | ||
1119 | cdesc->desc = kzalloc(sizeof(struct dw_desc *) * periods, GFP_KERNEL); | |
1120 | if (!cdesc->desc) | |
1121 | goto out_err_alloc; | |
1122 | ||
1123 | for (i = 0; i < periods; i++) { | |
1124 | desc = dwc_desc_get(dwc); | |
1125 | if (!desc) | |
1126 | goto out_err_desc_get; | |
1127 | ||
1128 | switch (direction) { | |
1129 | case DMA_TO_DEVICE: | |
1130 | desc->lli.dar = dws->tx_reg; | |
1131 | desc->lli.sar = buf_addr + (period_len * i); | |
1132 | desc->lli.ctllo = (DWC_DEFAULT_CTLLO | |
1133 | | DWC_CTLL_DST_WIDTH(reg_width) | |
1134 | | DWC_CTLL_SRC_WIDTH(reg_width) | |
1135 | | DWC_CTLL_DST_FIX | |
1136 | | DWC_CTLL_SRC_INC | |
1137 | | DWC_CTLL_FC_M2P | |
1138 | | DWC_CTLL_INT_EN); | |
1139 | break; | |
1140 | case DMA_FROM_DEVICE: | |
1141 | desc->lli.dar = buf_addr + (period_len * i); | |
1142 | desc->lli.sar = dws->rx_reg; | |
1143 | desc->lli.ctllo = (DWC_DEFAULT_CTLLO | |
1144 | | DWC_CTLL_SRC_WIDTH(reg_width) | |
1145 | | DWC_CTLL_DST_WIDTH(reg_width) | |
1146 | | DWC_CTLL_DST_INC | |
1147 | | DWC_CTLL_SRC_FIX | |
1148 | | DWC_CTLL_FC_P2M | |
1149 | | DWC_CTLL_INT_EN); | |
1150 | break; | |
1151 | default: | |
1152 | break; | |
1153 | } | |
1154 | ||
1155 | desc->lli.ctlhi = (period_len >> reg_width); | |
1156 | cdesc->desc[i] = desc; | |
1157 | ||
1158 | if (last) { | |
1159 | last->lli.llp = desc->txd.phys; | |
1160 | dma_sync_single_for_device(chan2parent(chan), | |
1161 | last->txd.phys, sizeof(last->lli), | |
1162 | DMA_TO_DEVICE); | |
1163 | } | |
1164 | ||
1165 | last = desc; | |
1166 | } | |
1167 | ||
1168 | /* lets make a cyclic list */ | |
1169 | last->lli.llp = cdesc->desc[0]->txd.phys; | |
1170 | dma_sync_single_for_device(chan2parent(chan), last->txd.phys, | |
1171 | sizeof(last->lli), DMA_TO_DEVICE); | |
1172 | ||
1173 | dev_dbg(chan2dev(&dwc->chan), "cyclic prepared buf 0x%08x len %zu " | |
1174 | "period %zu periods %d\n", buf_addr, buf_len, | |
1175 | period_len, periods); | |
1176 | ||
1177 | cdesc->periods = periods; | |
1178 | dwc->cdesc = cdesc; | |
1179 | ||
1180 | return cdesc; | |
1181 | ||
1182 | out_err_desc_get: | |
1183 | while (i--) | |
1184 | dwc_desc_put(dwc, cdesc->desc[i]); | |
1185 | out_err_alloc: | |
1186 | kfree(cdesc); | |
1187 | out_err: | |
1188 | clear_bit(DW_DMA_IS_CYCLIC, &dwc->flags); | |
1189 | return (struct dw_cyclic_desc *)retval; | |
1190 | } | |
1191 | EXPORT_SYMBOL(dw_dma_cyclic_prep); | |
1192 | ||
1193 | /** | |
1194 | * dw_dma_cyclic_free - free a prepared cyclic DMA transfer | |
1195 | * @chan: the DMA channel to free | |
1196 | */ | |
1197 | void dw_dma_cyclic_free(struct dma_chan *chan) | |
1198 | { | |
1199 | struct dw_dma_chan *dwc = to_dw_dma_chan(chan); | |
1200 | struct dw_dma *dw = to_dw_dma(dwc->chan.device); | |
1201 | struct dw_cyclic_desc *cdesc = dwc->cdesc; | |
1202 | int i; | |
1203 | ||
1204 | dev_dbg(chan2dev(&dwc->chan), "cyclic free\n"); | |
1205 | ||
1206 | if (!cdesc) | |
1207 | return; | |
1208 | ||
1209 | spin_lock_bh(&dwc->lock); | |
1210 | ||
1211 | channel_clear_bit(dw, CH_EN, dwc->mask); | |
1212 | while (dma_readl(dw, CH_EN) & dwc->mask) | |
1213 | cpu_relax(); | |
1214 | ||
1215 | dma_writel(dw, CLEAR.BLOCK, dwc->mask); | |
1216 | dma_writel(dw, CLEAR.ERROR, dwc->mask); | |
1217 | dma_writel(dw, CLEAR.XFER, dwc->mask); | |
1218 | ||
1219 | spin_unlock_bh(&dwc->lock); | |
1220 | ||
1221 | for (i = 0; i < cdesc->periods; i++) | |
1222 | dwc_desc_put(dwc, cdesc->desc[i]); | |
1223 | ||
1224 | kfree(cdesc->desc); | |
1225 | kfree(cdesc); | |
1226 | ||
1227 | clear_bit(DW_DMA_IS_CYCLIC, &dwc->flags); | |
1228 | } | |
1229 | EXPORT_SYMBOL(dw_dma_cyclic_free); | |
1230 | ||
3bfb1d20 HS |
1231 | /*----------------------------------------------------------------------*/ |
1232 | ||
1233 | static void dw_dma_off(struct dw_dma *dw) | |
1234 | { | |
1235 | dma_writel(dw, CFG, 0); | |
1236 | ||
1237 | channel_clear_bit(dw, MASK.XFER, dw->all_chan_mask); | |
1238 | channel_clear_bit(dw, MASK.BLOCK, dw->all_chan_mask); | |
1239 | channel_clear_bit(dw, MASK.SRC_TRAN, dw->all_chan_mask); | |
1240 | channel_clear_bit(dw, MASK.DST_TRAN, dw->all_chan_mask); | |
1241 | channel_clear_bit(dw, MASK.ERROR, dw->all_chan_mask); | |
1242 | ||
1243 | while (dma_readl(dw, CFG) & DW_CFG_DMA_EN) | |
1244 | cpu_relax(); | |
1245 | } | |
1246 | ||
1247 | static int __init dw_probe(struct platform_device *pdev) | |
1248 | { | |
1249 | struct dw_dma_platform_data *pdata; | |
1250 | struct resource *io; | |
1251 | struct dw_dma *dw; | |
1252 | size_t size; | |
1253 | int irq; | |
1254 | int err; | |
1255 | int i; | |
1256 | ||
1257 | pdata = pdev->dev.platform_data; | |
1258 | if (!pdata || pdata->nr_channels > DW_DMA_MAX_NR_CHANNELS) | |
1259 | return -EINVAL; | |
1260 | ||
1261 | io = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
1262 | if (!io) | |
1263 | return -EINVAL; | |
1264 | ||
1265 | irq = platform_get_irq(pdev, 0); | |
1266 | if (irq < 0) | |
1267 | return irq; | |
1268 | ||
1269 | size = sizeof(struct dw_dma); | |
1270 | size += pdata->nr_channels * sizeof(struct dw_dma_chan); | |
1271 | dw = kzalloc(size, GFP_KERNEL); | |
1272 | if (!dw) | |
1273 | return -ENOMEM; | |
1274 | ||
1275 | if (!request_mem_region(io->start, DW_REGLEN, pdev->dev.driver->name)) { | |
1276 | err = -EBUSY; | |
1277 | goto err_kfree; | |
1278 | } | |
1279 | ||
3bfb1d20 HS |
1280 | dw->regs = ioremap(io->start, DW_REGLEN); |
1281 | if (!dw->regs) { | |
1282 | err = -ENOMEM; | |
1283 | goto err_release_r; | |
1284 | } | |
1285 | ||
1286 | dw->clk = clk_get(&pdev->dev, "hclk"); | |
1287 | if (IS_ERR(dw->clk)) { | |
1288 | err = PTR_ERR(dw->clk); | |
1289 | goto err_clk; | |
1290 | } | |
1291 | clk_enable(dw->clk); | |
1292 | ||
1293 | /* force dma off, just in case */ | |
1294 | dw_dma_off(dw); | |
1295 | ||
1296 | err = request_irq(irq, dw_dma_interrupt, 0, "dw_dmac", dw); | |
1297 | if (err) | |
1298 | goto err_irq; | |
1299 | ||
1300 | platform_set_drvdata(pdev, dw); | |
1301 | ||
1302 | tasklet_init(&dw->tasklet, dw_dma_tasklet, (unsigned long)dw); | |
1303 | ||
1304 | dw->all_chan_mask = (1 << pdata->nr_channels) - 1; | |
1305 | ||
1306 | INIT_LIST_HEAD(&dw->dma.channels); | |
1307 | for (i = 0; i < pdata->nr_channels; i++, dw->dma.chancnt++) { | |
1308 | struct dw_dma_chan *dwc = &dw->chan[i]; | |
1309 | ||
1310 | dwc->chan.device = &dw->dma; | |
1311 | dwc->chan.cookie = dwc->completed = 1; | |
1312 | dwc->chan.chan_id = i; | |
1313 | list_add_tail(&dwc->chan.device_node, &dw->dma.channels); | |
1314 | ||
1315 | dwc->ch_regs = &__dw_regs(dw)->CHAN[i]; | |
1316 | spin_lock_init(&dwc->lock); | |
1317 | dwc->mask = 1 << i; | |
1318 | ||
1319 | INIT_LIST_HEAD(&dwc->active_list); | |
1320 | INIT_LIST_HEAD(&dwc->queue); | |
1321 | INIT_LIST_HEAD(&dwc->free_list); | |
1322 | ||
1323 | channel_clear_bit(dw, CH_EN, dwc->mask); | |
1324 | } | |
1325 | ||
1326 | /* Clear/disable all interrupts on all channels. */ | |
1327 | dma_writel(dw, CLEAR.XFER, dw->all_chan_mask); | |
1328 | dma_writel(dw, CLEAR.BLOCK, dw->all_chan_mask); | |
1329 | dma_writel(dw, CLEAR.SRC_TRAN, dw->all_chan_mask); | |
1330 | dma_writel(dw, CLEAR.DST_TRAN, dw->all_chan_mask); | |
1331 | dma_writel(dw, CLEAR.ERROR, dw->all_chan_mask); | |
1332 | ||
1333 | channel_clear_bit(dw, MASK.XFER, dw->all_chan_mask); | |
1334 | channel_clear_bit(dw, MASK.BLOCK, dw->all_chan_mask); | |
1335 | channel_clear_bit(dw, MASK.SRC_TRAN, dw->all_chan_mask); | |
1336 | channel_clear_bit(dw, MASK.DST_TRAN, dw->all_chan_mask); | |
1337 | channel_clear_bit(dw, MASK.ERROR, dw->all_chan_mask); | |
1338 | ||
1339 | dma_cap_set(DMA_MEMCPY, dw->dma.cap_mask); | |
1340 | dma_cap_set(DMA_SLAVE, dw->dma.cap_mask); | |
1341 | dw->dma.dev = &pdev->dev; | |
1342 | dw->dma.device_alloc_chan_resources = dwc_alloc_chan_resources; | |
1343 | dw->dma.device_free_chan_resources = dwc_free_chan_resources; | |
1344 | ||
1345 | dw->dma.device_prep_dma_memcpy = dwc_prep_dma_memcpy; | |
1346 | ||
1347 | dw->dma.device_prep_slave_sg = dwc_prep_slave_sg; | |
c3635c78 | 1348 | dw->dma.device_control = dwc_control; |
3bfb1d20 | 1349 | |
07934481 | 1350 | dw->dma.device_tx_status = dwc_tx_status; |
3bfb1d20 HS |
1351 | dw->dma.device_issue_pending = dwc_issue_pending; |
1352 | ||
1353 | dma_writel(dw, CFG, DW_CFG_DMA_EN); | |
1354 | ||
1355 | printk(KERN_INFO "%s: DesignWare DMA Controller, %d channels\n", | |
dfbc9019 | 1356 | dev_name(&pdev->dev), dw->dma.chancnt); |
3bfb1d20 HS |
1357 | |
1358 | dma_async_device_register(&dw->dma); | |
1359 | ||
1360 | return 0; | |
1361 | ||
1362 | err_irq: | |
1363 | clk_disable(dw->clk); | |
1364 | clk_put(dw->clk); | |
1365 | err_clk: | |
1366 | iounmap(dw->regs); | |
1367 | dw->regs = NULL; | |
1368 | err_release_r: | |
1369 | release_resource(io); | |
1370 | err_kfree: | |
1371 | kfree(dw); | |
1372 | return err; | |
1373 | } | |
1374 | ||
1375 | static int __exit dw_remove(struct platform_device *pdev) | |
1376 | { | |
1377 | struct dw_dma *dw = platform_get_drvdata(pdev); | |
1378 | struct dw_dma_chan *dwc, *_dwc; | |
1379 | struct resource *io; | |
1380 | ||
1381 | dw_dma_off(dw); | |
1382 | dma_async_device_unregister(&dw->dma); | |
1383 | ||
1384 | free_irq(platform_get_irq(pdev, 0), dw); | |
1385 | tasklet_kill(&dw->tasklet); | |
1386 | ||
1387 | list_for_each_entry_safe(dwc, _dwc, &dw->dma.channels, | |
1388 | chan.device_node) { | |
1389 | list_del(&dwc->chan.device_node); | |
1390 | channel_clear_bit(dw, CH_EN, dwc->mask); | |
1391 | } | |
1392 | ||
1393 | clk_disable(dw->clk); | |
1394 | clk_put(dw->clk); | |
1395 | ||
1396 | iounmap(dw->regs); | |
1397 | dw->regs = NULL; | |
1398 | ||
1399 | io = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
1400 | release_mem_region(io->start, DW_REGLEN); | |
1401 | ||
1402 | kfree(dw); | |
1403 | ||
1404 | return 0; | |
1405 | } | |
1406 | ||
1407 | static void dw_shutdown(struct platform_device *pdev) | |
1408 | { | |
1409 | struct dw_dma *dw = platform_get_drvdata(pdev); | |
1410 | ||
1411 | dw_dma_off(platform_get_drvdata(pdev)); | |
1412 | clk_disable(dw->clk); | |
1413 | } | |
1414 | ||
4a256b5f | 1415 | static int dw_suspend_noirq(struct device *dev) |
3bfb1d20 | 1416 | { |
4a256b5f | 1417 | struct platform_device *pdev = to_platform_device(dev); |
3bfb1d20 HS |
1418 | struct dw_dma *dw = platform_get_drvdata(pdev); |
1419 | ||
1420 | dw_dma_off(platform_get_drvdata(pdev)); | |
1421 | clk_disable(dw->clk); | |
1422 | return 0; | |
1423 | } | |
1424 | ||
4a256b5f | 1425 | static int dw_resume_noirq(struct device *dev) |
3bfb1d20 | 1426 | { |
4a256b5f | 1427 | struct platform_device *pdev = to_platform_device(dev); |
3bfb1d20 HS |
1428 | struct dw_dma *dw = platform_get_drvdata(pdev); |
1429 | ||
1430 | clk_enable(dw->clk); | |
1431 | dma_writel(dw, CFG, DW_CFG_DMA_EN); | |
1432 | return 0; | |
3bfb1d20 HS |
1433 | } |
1434 | ||
47145210 | 1435 | static const struct dev_pm_ops dw_dev_pm_ops = { |
4a256b5f MD |
1436 | .suspend_noirq = dw_suspend_noirq, |
1437 | .resume_noirq = dw_resume_noirq, | |
1438 | }; | |
1439 | ||
3bfb1d20 HS |
1440 | static struct platform_driver dw_driver = { |
1441 | .remove = __exit_p(dw_remove), | |
1442 | .shutdown = dw_shutdown, | |
3bfb1d20 HS |
1443 | .driver = { |
1444 | .name = "dw_dmac", | |
4a256b5f | 1445 | .pm = &dw_dev_pm_ops, |
3bfb1d20 HS |
1446 | }, |
1447 | }; | |
1448 | ||
1449 | static int __init dw_init(void) | |
1450 | { | |
1451 | return platform_driver_probe(&dw_driver, dw_probe); | |
1452 | } | |
1453 | module_init(dw_init); | |
1454 | ||
1455 | static void __exit dw_exit(void) | |
1456 | { | |
1457 | platform_driver_unregister(&dw_driver); | |
1458 | } | |
1459 | module_exit(dw_exit); | |
1460 | ||
1461 | MODULE_LICENSE("GPL v2"); | |
1462 | MODULE_DESCRIPTION("Synopsys DesignWare DMA Controller driver"); | |
1463 | MODULE_AUTHOR("Haavard Skinnemoen <haavard.skinnemoen@atmel.com>"); |