Commit | Line | Data |
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c2dde5f8 MP |
1 | /* |
2 | * TI EDMA DMA engine driver | |
3 | * | |
4 | * Copyright 2012 Texas Instruments | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License as | |
8 | * published by the Free Software Foundation version 2. | |
9 | * | |
10 | * This program is distributed "as is" WITHOUT ANY WARRANTY of any | |
11 | * kind, whether express or implied; without even the implied warranty | |
12 | * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | */ | |
15 | ||
16 | #include <linux/dmaengine.h> | |
17 | #include <linux/dma-mapping.h> | |
18 | #include <linux/err.h> | |
19 | #include <linux/init.h> | |
20 | #include <linux/interrupt.h> | |
21 | #include <linux/list.h> | |
22 | #include <linux/module.h> | |
23 | #include <linux/platform_device.h> | |
24 | #include <linux/slab.h> | |
25 | #include <linux/spinlock.h> | |
ed64610f | 26 | #include <linux/of.h> |
c2dde5f8 | 27 | |
3ad7a42d | 28 | #include <linux/platform_data/edma.h> |
c2dde5f8 MP |
29 | |
30 | #include "dmaengine.h" | |
31 | #include "virt-dma.h" | |
32 | ||
33 | /* | |
34 | * This will go away when the private EDMA API is folded | |
35 | * into this driver and the platform device(s) are | |
36 | * instantiated in the arch code. We can only get away | |
37 | * with this simplification because DA8XX may not be built | |
38 | * in the same kernel image with other DaVinci parts. This | |
39 | * avoids having to sprinkle dmaengine driver platform devices | |
40 | * and data throughout all the existing board files. | |
41 | */ | |
42 | #ifdef CONFIG_ARCH_DAVINCI_DA8XX | |
43 | #define EDMA_CTLRS 2 | |
44 | #define EDMA_CHANS 32 | |
45 | #else | |
46 | #define EDMA_CTLRS 1 | |
47 | #define EDMA_CHANS 64 | |
48 | #endif /* CONFIG_ARCH_DAVINCI_DA8XX */ | |
49 | ||
2abd5f1b JF |
50 | /* |
51 | * Max of 20 segments per channel to conserve PaRAM slots | |
52 | * Also note that MAX_NR_SG should be atleast the no.of periods | |
53 | * that are required for ASoC, otherwise DMA prep calls will | |
54 | * fail. Today davinci-pcm is the only user of this driver and | |
55 | * requires atleast 17 slots, so we setup the default to 20. | |
56 | */ | |
57 | #define MAX_NR_SG 20 | |
c2dde5f8 MP |
58 | #define EDMA_MAX_SLOTS MAX_NR_SG |
59 | #define EDMA_DESCRIPTORS 16 | |
60 | ||
b5088ad9 | 61 | struct edma_pset { |
c2da2340 TG |
62 | u32 len; |
63 | dma_addr_t addr; | |
b5088ad9 TG |
64 | struct edmacc_param param; |
65 | }; | |
66 | ||
c2dde5f8 MP |
67 | struct edma_desc { |
68 | struct virt_dma_desc vdesc; | |
69 | struct list_head node; | |
c2da2340 | 70 | enum dma_transfer_direction direction; |
50a9c707 | 71 | int cyclic; |
c2dde5f8 MP |
72 | int absync; |
73 | int pset_nr; | |
04361d88 | 74 | struct edma_chan *echan; |
53407062 | 75 | int processed; |
04361d88 JF |
76 | |
77 | /* | |
78 | * The following 4 elements are used for residue accounting. | |
79 | * | |
80 | * - processed_stat: the number of SG elements we have traversed | |
81 | * so far to cover accounting. This is updated directly to processed | |
82 | * during edma_callback and is always <= processed, because processed | |
83 | * refers to the number of pending transfer (programmed to EDMA | |
84 | * controller), where as processed_stat tracks number of transfers | |
85 | * accounted for so far. | |
86 | * | |
87 | * - residue: The amount of bytes we have left to transfer for this desc | |
88 | * | |
89 | * - residue_stat: The residue in bytes of data we have covered | |
90 | * so far for accounting. This is updated directly to residue | |
91 | * during callbacks to keep it current. | |
92 | * | |
93 | * - sg_len: Tracks the length of the current intermediate transfer, | |
94 | * this is required to update the residue during intermediate transfer | |
95 | * completion callback. | |
96 | */ | |
740b41f7 | 97 | int processed_stat; |
740b41f7 | 98 | u32 sg_len; |
04361d88 | 99 | u32 residue; |
740b41f7 | 100 | u32 residue_stat; |
04361d88 | 101 | |
b5088ad9 | 102 | struct edma_pset pset[0]; |
c2dde5f8 MP |
103 | }; |
104 | ||
105 | struct edma_cc; | |
106 | ||
107 | struct edma_chan { | |
108 | struct virt_dma_chan vchan; | |
109 | struct list_head node; | |
110 | struct edma_desc *edesc; | |
111 | struct edma_cc *ecc; | |
112 | int ch_num; | |
113 | bool alloced; | |
114 | int slot[EDMA_MAX_SLOTS]; | |
c5f47990 | 115 | int missed; |
661f7cb5 | 116 | struct dma_slave_config cfg; |
c2dde5f8 MP |
117 | }; |
118 | ||
119 | struct edma_cc { | |
120 | int ctlr; | |
121 | struct dma_device dma_slave; | |
122 | struct edma_chan slave_chans[EDMA_CHANS]; | |
123 | int num_slave_chans; | |
124 | int dummy_slot; | |
125 | }; | |
126 | ||
127 | static inline struct edma_cc *to_edma_cc(struct dma_device *d) | |
128 | { | |
129 | return container_of(d, struct edma_cc, dma_slave); | |
130 | } | |
131 | ||
132 | static inline struct edma_chan *to_edma_chan(struct dma_chan *c) | |
133 | { | |
134 | return container_of(c, struct edma_chan, vchan.chan); | |
135 | } | |
136 | ||
137 | static inline struct edma_desc | |
138 | *to_edma_desc(struct dma_async_tx_descriptor *tx) | |
139 | { | |
140 | return container_of(tx, struct edma_desc, vdesc.tx); | |
141 | } | |
142 | ||
143 | static void edma_desc_free(struct virt_dma_desc *vdesc) | |
144 | { | |
145 | kfree(container_of(vdesc, struct edma_desc, vdesc)); | |
146 | } | |
147 | ||
148 | /* Dispatch a queued descriptor to the controller (caller holds lock) */ | |
149 | static void edma_execute(struct edma_chan *echan) | |
150 | { | |
53407062 | 151 | struct virt_dma_desc *vdesc; |
c2dde5f8 | 152 | struct edma_desc *edesc; |
53407062 JF |
153 | struct device *dev = echan->vchan.chan.device->dev; |
154 | int i, j, left, nslots; | |
155 | ||
156 | /* If either we processed all psets or we're still not started */ | |
157 | if (!echan->edesc || | |
158 | echan->edesc->pset_nr == echan->edesc->processed) { | |
159 | /* Get next vdesc */ | |
160 | vdesc = vchan_next_desc(&echan->vchan); | |
161 | if (!vdesc) { | |
162 | echan->edesc = NULL; | |
163 | return; | |
164 | } | |
165 | list_del(&vdesc->node); | |
166 | echan->edesc = to_edma_desc(&vdesc->tx); | |
c2dde5f8 MP |
167 | } |
168 | ||
53407062 | 169 | edesc = echan->edesc; |
c2dde5f8 | 170 | |
53407062 JF |
171 | /* Find out how many left */ |
172 | left = edesc->pset_nr - edesc->processed; | |
173 | nslots = min(MAX_NR_SG, left); | |
740b41f7 | 174 | edesc->sg_len = 0; |
c2dde5f8 MP |
175 | |
176 | /* Write descriptor PaRAM set(s) */ | |
53407062 JF |
177 | for (i = 0; i < nslots; i++) { |
178 | j = i + edesc->processed; | |
b5088ad9 | 179 | edma_write_slot(echan->slot[i], &edesc->pset[j].param); |
740b41f7 | 180 | edesc->sg_len += edesc->pset[j].len; |
83bb3126 | 181 | dev_vdbg(echan->vchan.chan.device->dev, |
c2dde5f8 MP |
182 | "\n pset[%d]:\n" |
183 | " chnum\t%d\n" | |
184 | " slot\t%d\n" | |
185 | " opt\t%08x\n" | |
186 | " src\t%08x\n" | |
187 | " dst\t%08x\n" | |
188 | " abcnt\t%08x\n" | |
189 | " ccnt\t%08x\n" | |
190 | " bidx\t%08x\n" | |
191 | " cidx\t%08x\n" | |
192 | " lkrld\t%08x\n", | |
53407062 | 193 | j, echan->ch_num, echan->slot[i], |
b5088ad9 TG |
194 | edesc->pset[j].param.opt, |
195 | edesc->pset[j].param.src, | |
196 | edesc->pset[j].param.dst, | |
197 | edesc->pset[j].param.a_b_cnt, | |
198 | edesc->pset[j].param.ccnt, | |
199 | edesc->pset[j].param.src_dst_bidx, | |
200 | edesc->pset[j].param.src_dst_cidx, | |
201 | edesc->pset[j].param.link_bcntrld); | |
c2dde5f8 | 202 | /* Link to the previous slot if not the last set */ |
53407062 | 203 | if (i != (nslots - 1)) |
c2dde5f8 | 204 | edma_link(echan->slot[i], echan->slot[i+1]); |
c2dde5f8 MP |
205 | } |
206 | ||
53407062 JF |
207 | edesc->processed += nslots; |
208 | ||
b267b3bc JF |
209 | /* |
210 | * If this is either the last set in a set of SG-list transactions | |
211 | * then setup a link to the dummy slot, this results in all future | |
212 | * events being absorbed and that's OK because we're done | |
213 | */ | |
50a9c707 JF |
214 | if (edesc->processed == edesc->pset_nr) { |
215 | if (edesc->cyclic) | |
216 | edma_link(echan->slot[nslots-1], echan->slot[1]); | |
217 | else | |
218 | edma_link(echan->slot[nslots-1], | |
219 | echan->ecc->dummy_slot); | |
220 | } | |
b267b3bc | 221 | |
53407062 | 222 | if (edesc->processed <= MAX_NR_SG) { |
9aac9096 PU |
223 | dev_dbg(dev, "first transfer starting on channel %d\n", |
224 | echan->ch_num); | |
53407062 | 225 | edma_start(echan->ch_num); |
5fc68a6c SN |
226 | } else { |
227 | dev_dbg(dev, "chan: %d: completed %d elements, resuming\n", | |
228 | echan->ch_num, edesc->processed); | |
229 | edma_resume(echan->ch_num); | |
53407062 | 230 | } |
c5f47990 JF |
231 | |
232 | /* | |
233 | * This happens due to setup times between intermediate transfers | |
234 | * in long SG lists which have to be broken up into transfers of | |
235 | * MAX_NR_SG | |
236 | */ | |
237 | if (echan->missed) { | |
9aac9096 | 238 | dev_dbg(dev, "missed event on channel %d\n", echan->ch_num); |
c5f47990 JF |
239 | edma_clean_channel(echan->ch_num); |
240 | edma_stop(echan->ch_num); | |
241 | edma_start(echan->ch_num); | |
242 | edma_trigger_channel(echan->ch_num); | |
243 | echan->missed = 0; | |
244 | } | |
c2dde5f8 MP |
245 | } |
246 | ||
247 | static int edma_terminate_all(struct edma_chan *echan) | |
248 | { | |
249 | unsigned long flags; | |
250 | LIST_HEAD(head); | |
251 | ||
252 | spin_lock_irqsave(&echan->vchan.lock, flags); | |
253 | ||
254 | /* | |
255 | * Stop DMA activity: we assume the callback will not be called | |
256 | * after edma_dma() returns (even if it does, it will see | |
257 | * echan->edesc is NULL and exit.) | |
258 | */ | |
259 | if (echan->edesc) { | |
8e8805d5 | 260 | int cyclic = echan->edesc->cyclic; |
c2dde5f8 MP |
261 | echan->edesc = NULL; |
262 | edma_stop(echan->ch_num); | |
8e8805d5 PU |
263 | /* Move the cyclic channel back to default queue */ |
264 | if (cyclic) | |
265 | edma_assign_channel_eventq(echan->ch_num, | |
266 | EVENTQ_DEFAULT); | |
c2dde5f8 MP |
267 | } |
268 | ||
269 | vchan_get_all_descriptors(&echan->vchan, &head); | |
270 | spin_unlock_irqrestore(&echan->vchan.lock, flags); | |
271 | vchan_dma_desc_free_list(&echan->vchan, &head); | |
272 | ||
273 | return 0; | |
274 | } | |
275 | ||
c2dde5f8 | 276 | static int edma_slave_config(struct edma_chan *echan, |
661f7cb5 | 277 | struct dma_slave_config *cfg) |
c2dde5f8 | 278 | { |
661f7cb5 MP |
279 | if (cfg->src_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES || |
280 | cfg->dst_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES) | |
c2dde5f8 MP |
281 | return -EINVAL; |
282 | ||
661f7cb5 | 283 | memcpy(&echan->cfg, cfg, sizeof(echan->cfg)); |
c2dde5f8 MP |
284 | |
285 | return 0; | |
286 | } | |
287 | ||
72c7b67a PU |
288 | static int edma_dma_pause(struct edma_chan *echan) |
289 | { | |
290 | /* Pause/Resume only allowed with cyclic mode */ | |
639559ad | 291 | if (!echan->edesc || !echan->edesc->cyclic) |
72c7b67a PU |
292 | return -EINVAL; |
293 | ||
294 | edma_pause(echan->ch_num); | |
295 | return 0; | |
296 | } | |
297 | ||
298 | static int edma_dma_resume(struct edma_chan *echan) | |
299 | { | |
300 | /* Pause/Resume only allowed with cyclic mode */ | |
301 | if (!echan->edesc->cyclic) | |
302 | return -EINVAL; | |
303 | ||
304 | edma_resume(echan->ch_num); | |
305 | return 0; | |
306 | } | |
307 | ||
c2dde5f8 MP |
308 | static int edma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, |
309 | unsigned long arg) | |
310 | { | |
311 | int ret = 0; | |
312 | struct dma_slave_config *config; | |
313 | struct edma_chan *echan = to_edma_chan(chan); | |
314 | ||
315 | switch (cmd) { | |
316 | case DMA_TERMINATE_ALL: | |
317 | edma_terminate_all(echan); | |
318 | break; | |
319 | case DMA_SLAVE_CONFIG: | |
320 | config = (struct dma_slave_config *)arg; | |
321 | ret = edma_slave_config(echan, config); | |
322 | break; | |
72c7b67a PU |
323 | case DMA_PAUSE: |
324 | ret = edma_dma_pause(echan); | |
325 | break; | |
326 | ||
327 | case DMA_RESUME: | |
328 | ret = edma_dma_resume(echan); | |
329 | break; | |
330 | ||
c2dde5f8 MP |
331 | default: |
332 | ret = -ENOSYS; | |
333 | } | |
334 | ||
335 | return ret; | |
336 | } | |
337 | ||
fd009035 JF |
338 | /* |
339 | * A PaRAM set configuration abstraction used by other modes | |
340 | * @chan: Channel who's PaRAM set we're configuring | |
341 | * @pset: PaRAM set to initialize and setup. | |
342 | * @src_addr: Source address of the DMA | |
343 | * @dst_addr: Destination address of the DMA | |
344 | * @burst: In units of dev_width, how much to send | |
345 | * @dev_width: How much is the dev_width | |
346 | * @dma_length: Total length of the DMA transfer | |
347 | * @direction: Direction of the transfer | |
348 | */ | |
b5088ad9 | 349 | static int edma_config_pset(struct dma_chan *chan, struct edma_pset *epset, |
fd009035 JF |
350 | dma_addr_t src_addr, dma_addr_t dst_addr, u32 burst, |
351 | enum dma_slave_buswidth dev_width, unsigned int dma_length, | |
352 | enum dma_transfer_direction direction) | |
353 | { | |
354 | struct edma_chan *echan = to_edma_chan(chan); | |
355 | struct device *dev = chan->device->dev; | |
b5088ad9 | 356 | struct edmacc_param *param = &epset->param; |
fd009035 JF |
357 | int acnt, bcnt, ccnt, cidx; |
358 | int src_bidx, dst_bidx, src_cidx, dst_cidx; | |
359 | int absync; | |
360 | ||
361 | acnt = dev_width; | |
b2b617de PU |
362 | |
363 | /* src/dst_maxburst == 0 is the same case as src/dst_maxburst == 1 */ | |
364 | if (!burst) | |
365 | burst = 1; | |
fd009035 JF |
366 | /* |
367 | * If the maxburst is equal to the fifo width, use | |
368 | * A-synced transfers. This allows for large contiguous | |
369 | * buffer transfers using only one PaRAM set. | |
370 | */ | |
371 | if (burst == 1) { | |
372 | /* | |
373 | * For the A-sync case, bcnt and ccnt are the remainder | |
374 | * and quotient respectively of the division of: | |
375 | * (dma_length / acnt) by (SZ_64K -1). This is so | |
376 | * that in case bcnt over flows, we have ccnt to use. | |
377 | * Note: In A-sync tranfer only, bcntrld is used, but it | |
378 | * only applies for sg_dma_len(sg) >= SZ_64K. | |
379 | * In this case, the best way adopted is- bccnt for the | |
380 | * first frame will be the remainder below. Then for | |
381 | * every successive frame, bcnt will be SZ_64K-1. This | |
382 | * is assured as bcntrld = 0xffff in end of function. | |
383 | */ | |
384 | absync = false; | |
385 | ccnt = dma_length / acnt / (SZ_64K - 1); | |
386 | bcnt = dma_length / acnt - ccnt * (SZ_64K - 1); | |
387 | /* | |
388 | * If bcnt is non-zero, we have a remainder and hence an | |
389 | * extra frame to transfer, so increment ccnt. | |
390 | */ | |
391 | if (bcnt) | |
392 | ccnt++; | |
393 | else | |
394 | bcnt = SZ_64K - 1; | |
395 | cidx = acnt; | |
396 | } else { | |
397 | /* | |
398 | * If maxburst is greater than the fifo address_width, | |
399 | * use AB-synced transfers where A count is the fifo | |
400 | * address_width and B count is the maxburst. In this | |
401 | * case, we are limited to transfers of C count frames | |
402 | * of (address_width * maxburst) where C count is limited | |
403 | * to SZ_64K-1. This places an upper bound on the length | |
404 | * of an SG segment that can be handled. | |
405 | */ | |
406 | absync = true; | |
407 | bcnt = burst; | |
408 | ccnt = dma_length / (acnt * bcnt); | |
409 | if (ccnt > (SZ_64K - 1)) { | |
410 | dev_err(dev, "Exceeded max SG segment size\n"); | |
411 | return -EINVAL; | |
412 | } | |
413 | cidx = acnt * bcnt; | |
414 | } | |
415 | ||
c2da2340 TG |
416 | epset->len = dma_length; |
417 | ||
fd009035 JF |
418 | if (direction == DMA_MEM_TO_DEV) { |
419 | src_bidx = acnt; | |
420 | src_cidx = cidx; | |
421 | dst_bidx = 0; | |
422 | dst_cidx = 0; | |
c2da2340 | 423 | epset->addr = src_addr; |
fd009035 JF |
424 | } else if (direction == DMA_DEV_TO_MEM) { |
425 | src_bidx = 0; | |
426 | src_cidx = 0; | |
427 | dst_bidx = acnt; | |
428 | dst_cidx = cidx; | |
c2da2340 | 429 | epset->addr = dst_addr; |
8cc3e30b JF |
430 | } else if (direction == DMA_MEM_TO_MEM) { |
431 | src_bidx = acnt; | |
432 | src_cidx = cidx; | |
433 | dst_bidx = acnt; | |
434 | dst_cidx = cidx; | |
fd009035 JF |
435 | } else { |
436 | dev_err(dev, "%s: direction not implemented yet\n", __func__); | |
437 | return -EINVAL; | |
438 | } | |
439 | ||
b5088ad9 | 440 | param->opt = EDMA_TCC(EDMA_CHAN_SLOT(echan->ch_num)); |
fd009035 JF |
441 | /* Configure A or AB synchronized transfers */ |
442 | if (absync) | |
b5088ad9 | 443 | param->opt |= SYNCDIM; |
fd009035 | 444 | |
b5088ad9 TG |
445 | param->src = src_addr; |
446 | param->dst = dst_addr; | |
fd009035 | 447 | |
b5088ad9 TG |
448 | param->src_dst_bidx = (dst_bidx << 16) | src_bidx; |
449 | param->src_dst_cidx = (dst_cidx << 16) | src_cidx; | |
fd009035 | 450 | |
b5088ad9 TG |
451 | param->a_b_cnt = bcnt << 16 | acnt; |
452 | param->ccnt = ccnt; | |
fd009035 JF |
453 | /* |
454 | * Only time when (bcntrld) auto reload is required is for | |
455 | * A-sync case, and in this case, a requirement of reload value | |
456 | * of SZ_64K-1 only is assured. 'link' is initially set to NULL | |
457 | * and then later will be populated by edma_execute. | |
458 | */ | |
b5088ad9 | 459 | param->link_bcntrld = 0xffffffff; |
fd009035 JF |
460 | return absync; |
461 | } | |
462 | ||
c2dde5f8 MP |
463 | static struct dma_async_tx_descriptor *edma_prep_slave_sg( |
464 | struct dma_chan *chan, struct scatterlist *sgl, | |
465 | unsigned int sg_len, enum dma_transfer_direction direction, | |
466 | unsigned long tx_flags, void *context) | |
467 | { | |
468 | struct edma_chan *echan = to_edma_chan(chan); | |
469 | struct device *dev = chan->device->dev; | |
470 | struct edma_desc *edesc; | |
fd009035 | 471 | dma_addr_t src_addr = 0, dst_addr = 0; |
661f7cb5 MP |
472 | enum dma_slave_buswidth dev_width; |
473 | u32 burst; | |
c2dde5f8 | 474 | struct scatterlist *sg; |
fd009035 | 475 | int i, nslots, ret; |
c2dde5f8 MP |
476 | |
477 | if (unlikely(!echan || !sgl || !sg_len)) | |
478 | return NULL; | |
479 | ||
661f7cb5 | 480 | if (direction == DMA_DEV_TO_MEM) { |
fd009035 | 481 | src_addr = echan->cfg.src_addr; |
661f7cb5 MP |
482 | dev_width = echan->cfg.src_addr_width; |
483 | burst = echan->cfg.src_maxburst; | |
484 | } else if (direction == DMA_MEM_TO_DEV) { | |
fd009035 | 485 | dst_addr = echan->cfg.dst_addr; |
661f7cb5 MP |
486 | dev_width = echan->cfg.dst_addr_width; |
487 | burst = echan->cfg.dst_maxburst; | |
488 | } else { | |
e6fad592 | 489 | dev_err(dev, "%s: bad direction: %d\n", __func__, direction); |
661f7cb5 MP |
490 | return NULL; |
491 | } | |
492 | ||
493 | if (dev_width == DMA_SLAVE_BUSWIDTH_UNDEFINED) { | |
c594c891 | 494 | dev_err(dev, "%s: Undefined slave buswidth\n", __func__); |
c2dde5f8 MP |
495 | return NULL; |
496 | } | |
497 | ||
c2dde5f8 MP |
498 | edesc = kzalloc(sizeof(*edesc) + sg_len * |
499 | sizeof(edesc->pset[0]), GFP_ATOMIC); | |
500 | if (!edesc) { | |
c594c891 | 501 | dev_err(dev, "%s: Failed to allocate a descriptor\n", __func__); |
c2dde5f8 MP |
502 | return NULL; |
503 | } | |
504 | ||
505 | edesc->pset_nr = sg_len; | |
b6205c39 | 506 | edesc->residue = 0; |
c2da2340 | 507 | edesc->direction = direction; |
740b41f7 | 508 | edesc->echan = echan; |
c2dde5f8 | 509 | |
6fbe24da JF |
510 | /* Allocate a PaRAM slot, if needed */ |
511 | nslots = min_t(unsigned, MAX_NR_SG, sg_len); | |
512 | ||
513 | for (i = 0; i < nslots; i++) { | |
c2dde5f8 MP |
514 | if (echan->slot[i] < 0) { |
515 | echan->slot[i] = | |
516 | edma_alloc_slot(EDMA_CTLR(echan->ch_num), | |
517 | EDMA_SLOT_ANY); | |
518 | if (echan->slot[i] < 0) { | |
4b6271a6 | 519 | kfree(edesc); |
c594c891 PU |
520 | dev_err(dev, "%s: Failed to allocate slot\n", |
521 | __func__); | |
c2dde5f8 MP |
522 | return NULL; |
523 | } | |
524 | } | |
6fbe24da JF |
525 | } |
526 | ||
527 | /* Configure PaRAM sets for each SG */ | |
528 | for_each_sg(sgl, sg, sg_len, i) { | |
fd009035 JF |
529 | /* Get address for each SG */ |
530 | if (direction == DMA_DEV_TO_MEM) | |
531 | dst_addr = sg_dma_address(sg); | |
532 | else | |
533 | src_addr = sg_dma_address(sg); | |
c2dde5f8 | 534 | |
fd009035 JF |
535 | ret = edma_config_pset(chan, &edesc->pset[i], src_addr, |
536 | dst_addr, burst, dev_width, | |
537 | sg_dma_len(sg), direction); | |
b967aecf VK |
538 | if (ret < 0) { |
539 | kfree(edesc); | |
fd009035 | 540 | return NULL; |
c2dde5f8 MP |
541 | } |
542 | ||
fd009035 | 543 | edesc->absync = ret; |
b6205c39 | 544 | edesc->residue += sg_dma_len(sg); |
6fbe24da JF |
545 | |
546 | /* If this is the last in a current SG set of transactions, | |
547 | enable interrupts so that next set is processed */ | |
548 | if (!((i+1) % MAX_NR_SG)) | |
b5088ad9 | 549 | edesc->pset[i].param.opt |= TCINTEN; |
6fbe24da | 550 | |
c2dde5f8 MP |
551 | /* If this is the last set, enable completion interrupt flag */ |
552 | if (i == sg_len - 1) | |
b5088ad9 | 553 | edesc->pset[i].param.opt |= TCINTEN; |
c2dde5f8 | 554 | } |
740b41f7 | 555 | edesc->residue_stat = edesc->residue; |
c2dde5f8 | 556 | |
c2dde5f8 MP |
557 | return vchan_tx_prep(&echan->vchan, &edesc->vdesc, tx_flags); |
558 | } | |
c2dde5f8 | 559 | |
8cc3e30b JF |
560 | struct dma_async_tx_descriptor *edma_prep_dma_memcpy( |
561 | struct dma_chan *chan, dma_addr_t dest, dma_addr_t src, | |
562 | size_t len, unsigned long tx_flags) | |
563 | { | |
564 | int ret; | |
565 | struct edma_desc *edesc; | |
566 | struct device *dev = chan->device->dev; | |
567 | struct edma_chan *echan = to_edma_chan(chan); | |
568 | ||
569 | if (unlikely(!echan || !len)) | |
570 | return NULL; | |
571 | ||
572 | edesc = kzalloc(sizeof(*edesc) + sizeof(edesc->pset[0]), GFP_ATOMIC); | |
573 | if (!edesc) { | |
574 | dev_dbg(dev, "Failed to allocate a descriptor\n"); | |
575 | return NULL; | |
576 | } | |
577 | ||
578 | edesc->pset_nr = 1; | |
579 | ||
580 | ret = edma_config_pset(chan, &edesc->pset[0], src, dest, 1, | |
581 | DMA_SLAVE_BUSWIDTH_4_BYTES, len, DMA_MEM_TO_MEM); | |
582 | if (ret < 0) | |
583 | return NULL; | |
584 | ||
585 | edesc->absync = ret; | |
586 | ||
587 | /* | |
588 | * Enable intermediate transfer chaining to re-trigger channel | |
589 | * on completion of every TR, and enable transfer-completion | |
590 | * interrupt on completion of the whole transfer. | |
591 | */ | |
b0cce4ca JF |
592 | edesc->pset[0].param.opt |= ITCCHEN; |
593 | edesc->pset[0].param.opt |= TCINTEN; | |
8cc3e30b JF |
594 | |
595 | return vchan_tx_prep(&echan->vchan, &edesc->vdesc, tx_flags); | |
596 | } | |
597 | ||
50a9c707 JF |
598 | static struct dma_async_tx_descriptor *edma_prep_dma_cyclic( |
599 | struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len, | |
600 | size_t period_len, enum dma_transfer_direction direction, | |
31c1e5a1 | 601 | unsigned long tx_flags) |
50a9c707 JF |
602 | { |
603 | struct edma_chan *echan = to_edma_chan(chan); | |
604 | struct device *dev = chan->device->dev; | |
605 | struct edma_desc *edesc; | |
606 | dma_addr_t src_addr, dst_addr; | |
607 | enum dma_slave_buswidth dev_width; | |
608 | u32 burst; | |
609 | int i, ret, nslots; | |
610 | ||
611 | if (unlikely(!echan || !buf_len || !period_len)) | |
612 | return NULL; | |
613 | ||
614 | if (direction == DMA_DEV_TO_MEM) { | |
615 | src_addr = echan->cfg.src_addr; | |
616 | dst_addr = buf_addr; | |
617 | dev_width = echan->cfg.src_addr_width; | |
618 | burst = echan->cfg.src_maxburst; | |
619 | } else if (direction == DMA_MEM_TO_DEV) { | |
620 | src_addr = buf_addr; | |
621 | dst_addr = echan->cfg.dst_addr; | |
622 | dev_width = echan->cfg.dst_addr_width; | |
623 | burst = echan->cfg.dst_maxburst; | |
624 | } else { | |
e6fad592 | 625 | dev_err(dev, "%s: bad direction: %d\n", __func__, direction); |
50a9c707 JF |
626 | return NULL; |
627 | } | |
628 | ||
629 | if (dev_width == DMA_SLAVE_BUSWIDTH_UNDEFINED) { | |
c594c891 | 630 | dev_err(dev, "%s: Undefined slave buswidth\n", __func__); |
50a9c707 JF |
631 | return NULL; |
632 | } | |
633 | ||
634 | if (unlikely(buf_len % period_len)) { | |
635 | dev_err(dev, "Period should be multiple of Buffer length\n"); | |
636 | return NULL; | |
637 | } | |
638 | ||
639 | nslots = (buf_len / period_len) + 1; | |
640 | ||
641 | /* | |
642 | * Cyclic DMA users such as audio cannot tolerate delays introduced | |
643 | * by cases where the number of periods is more than the maximum | |
644 | * number of SGs the EDMA driver can handle at a time. For DMA types | |
645 | * such as Slave SGs, such delays are tolerable and synchronized, | |
646 | * but the synchronization is difficult to achieve with Cyclic and | |
647 | * cannot be guaranteed, so we error out early. | |
648 | */ | |
649 | if (nslots > MAX_NR_SG) | |
650 | return NULL; | |
651 | ||
652 | edesc = kzalloc(sizeof(*edesc) + nslots * | |
653 | sizeof(edesc->pset[0]), GFP_ATOMIC); | |
654 | if (!edesc) { | |
c594c891 | 655 | dev_err(dev, "%s: Failed to allocate a descriptor\n", __func__); |
50a9c707 JF |
656 | return NULL; |
657 | } | |
658 | ||
659 | edesc->cyclic = 1; | |
660 | edesc->pset_nr = nslots; | |
740b41f7 | 661 | edesc->residue = edesc->residue_stat = buf_len; |
c2da2340 | 662 | edesc->direction = direction; |
740b41f7 | 663 | edesc->echan = echan; |
50a9c707 | 664 | |
83bb3126 PU |
665 | dev_dbg(dev, "%s: channel=%d nslots=%d period_len=%zu buf_len=%zu\n", |
666 | __func__, echan->ch_num, nslots, period_len, buf_len); | |
50a9c707 JF |
667 | |
668 | for (i = 0; i < nslots; i++) { | |
669 | /* Allocate a PaRAM slot, if needed */ | |
670 | if (echan->slot[i] < 0) { | |
671 | echan->slot[i] = | |
672 | edma_alloc_slot(EDMA_CTLR(echan->ch_num), | |
673 | EDMA_SLOT_ANY); | |
674 | if (echan->slot[i] < 0) { | |
e3ddc979 | 675 | kfree(edesc); |
c594c891 PU |
676 | dev_err(dev, "%s: Failed to allocate slot\n", |
677 | __func__); | |
50a9c707 JF |
678 | return NULL; |
679 | } | |
680 | } | |
681 | ||
682 | if (i == nslots - 1) { | |
683 | memcpy(&edesc->pset[i], &edesc->pset[0], | |
684 | sizeof(edesc->pset[0])); | |
685 | break; | |
686 | } | |
687 | ||
688 | ret = edma_config_pset(chan, &edesc->pset[i], src_addr, | |
689 | dst_addr, burst, dev_width, period_len, | |
690 | direction); | |
e3ddc979 CE |
691 | if (ret < 0) { |
692 | kfree(edesc); | |
50a9c707 | 693 | return NULL; |
e3ddc979 | 694 | } |
c2dde5f8 | 695 | |
50a9c707 JF |
696 | if (direction == DMA_DEV_TO_MEM) |
697 | dst_addr += period_len; | |
698 | else | |
699 | src_addr += period_len; | |
c2dde5f8 | 700 | |
83bb3126 PU |
701 | dev_vdbg(dev, "%s: Configure period %d of buf:\n", __func__, i); |
702 | dev_vdbg(dev, | |
50a9c707 JF |
703 | "\n pset[%d]:\n" |
704 | " chnum\t%d\n" | |
705 | " slot\t%d\n" | |
706 | " opt\t%08x\n" | |
707 | " src\t%08x\n" | |
708 | " dst\t%08x\n" | |
709 | " abcnt\t%08x\n" | |
710 | " ccnt\t%08x\n" | |
711 | " bidx\t%08x\n" | |
712 | " cidx\t%08x\n" | |
713 | " lkrld\t%08x\n", | |
714 | i, echan->ch_num, echan->slot[i], | |
b5088ad9 TG |
715 | edesc->pset[i].param.opt, |
716 | edesc->pset[i].param.src, | |
717 | edesc->pset[i].param.dst, | |
718 | edesc->pset[i].param.a_b_cnt, | |
719 | edesc->pset[i].param.ccnt, | |
720 | edesc->pset[i].param.src_dst_bidx, | |
721 | edesc->pset[i].param.src_dst_cidx, | |
722 | edesc->pset[i].param.link_bcntrld); | |
50a9c707 JF |
723 | |
724 | edesc->absync = ret; | |
725 | ||
726 | /* | |
a1f146f3 | 727 | * Enable period interrupt only if it is requested |
50a9c707 | 728 | */ |
a1f146f3 PU |
729 | if (tx_flags & DMA_PREP_INTERRUPT) |
730 | edesc->pset[i].param.opt |= TCINTEN; | |
c2dde5f8 MP |
731 | } |
732 | ||
8e8805d5 PU |
733 | /* Place the cyclic channel to highest priority queue */ |
734 | edma_assign_channel_eventq(echan->ch_num, EVENTQ_0); | |
735 | ||
c2dde5f8 MP |
736 | return vchan_tx_prep(&echan->vchan, &edesc->vdesc, tx_flags); |
737 | } | |
738 | ||
739 | static void edma_callback(unsigned ch_num, u16 ch_status, void *data) | |
740 | { | |
741 | struct edma_chan *echan = data; | |
742 | struct device *dev = echan->vchan.chan.device->dev; | |
743 | struct edma_desc *edesc; | |
c5f47990 | 744 | struct edmacc_param p; |
c2dde5f8 | 745 | |
50a9c707 JF |
746 | edesc = echan->edesc; |
747 | ||
748 | /* Pause the channel for non-cyclic */ | |
749 | if (!edesc || (edesc && !edesc->cyclic)) | |
750 | edma_pause(echan->ch_num); | |
c2dde5f8 MP |
751 | |
752 | switch (ch_status) { | |
db60d8da | 753 | case EDMA_DMA_COMPLETE: |
406efb1a | 754 | spin_lock(&echan->vchan.lock); |
c2dde5f8 | 755 | |
c2dde5f8 | 756 | if (edesc) { |
50a9c707 JF |
757 | if (edesc->cyclic) { |
758 | vchan_cyclic_callback(&edesc->vdesc); | |
759 | } else if (edesc->processed == edesc->pset_nr) { | |
53407062 | 760 | dev_dbg(dev, "Transfer complete, stopping channel %d\n", ch_num); |
b6205c39 | 761 | edesc->residue = 0; |
53407062 JF |
762 | edma_stop(echan->ch_num); |
763 | vchan_cookie_complete(&edesc->vdesc); | |
50a9c707 | 764 | edma_execute(echan); |
53407062 JF |
765 | } else { |
766 | dev_dbg(dev, "Intermediate transfer complete on channel %d\n", ch_num); | |
740b41f7 TG |
767 | |
768 | /* Update statistics for tx_status */ | |
769 | edesc->residue -= edesc->sg_len; | |
770 | edesc->residue_stat = edesc->residue; | |
771 | edesc->processed_stat = edesc->processed; | |
772 | ||
50a9c707 | 773 | edma_execute(echan); |
53407062 | 774 | } |
c2dde5f8 MP |
775 | } |
776 | ||
406efb1a | 777 | spin_unlock(&echan->vchan.lock); |
c2dde5f8 MP |
778 | |
779 | break; | |
db60d8da | 780 | case EDMA_DMA_CC_ERROR: |
406efb1a | 781 | spin_lock(&echan->vchan.lock); |
c5f47990 JF |
782 | |
783 | edma_read_slot(EDMA_CHAN_SLOT(echan->slot[0]), &p); | |
784 | ||
785 | /* | |
786 | * Issue later based on missed flag which will be sure | |
787 | * to happen as: | |
788 | * (1) we finished transmitting an intermediate slot and | |
789 | * edma_execute is coming up. | |
790 | * (2) or we finished current transfer and issue will | |
791 | * call edma_execute. | |
792 | * | |
793 | * Important note: issuing can be dangerous here and | |
794 | * lead to some nasty recursion when we are in a NULL | |
795 | * slot. So we avoid doing so and set the missed flag. | |
796 | */ | |
797 | if (p.a_b_cnt == 0 && p.ccnt == 0) { | |
798 | dev_dbg(dev, "Error occurred, looks like slot is null, just setting miss\n"); | |
799 | echan->missed = 1; | |
800 | } else { | |
801 | /* | |
802 | * The slot is already programmed but the event got | |
803 | * missed, so its safe to issue it here. | |
804 | */ | |
805 | dev_dbg(dev, "Error occurred but slot is non-null, TRIGGERING\n"); | |
806 | edma_clean_channel(echan->ch_num); | |
807 | edma_stop(echan->ch_num); | |
808 | edma_start(echan->ch_num); | |
809 | edma_trigger_channel(echan->ch_num); | |
810 | } | |
811 | ||
406efb1a | 812 | spin_unlock(&echan->vchan.lock); |
c5f47990 | 813 | |
c2dde5f8 MP |
814 | break; |
815 | default: | |
816 | break; | |
817 | } | |
818 | } | |
819 | ||
820 | /* Alloc channel resources */ | |
821 | static int edma_alloc_chan_resources(struct dma_chan *chan) | |
822 | { | |
823 | struct edma_chan *echan = to_edma_chan(chan); | |
824 | struct device *dev = chan->device->dev; | |
825 | int ret; | |
826 | int a_ch_num; | |
827 | LIST_HEAD(descs); | |
828 | ||
829 | a_ch_num = edma_alloc_channel(echan->ch_num, edma_callback, | |
830 | chan, EVENTQ_DEFAULT); | |
831 | ||
832 | if (a_ch_num < 0) { | |
833 | ret = -ENODEV; | |
834 | goto err_no_chan; | |
835 | } | |
836 | ||
837 | if (a_ch_num != echan->ch_num) { | |
838 | dev_err(dev, "failed to allocate requested channel %u:%u\n", | |
839 | EDMA_CTLR(echan->ch_num), | |
840 | EDMA_CHAN_SLOT(echan->ch_num)); | |
841 | ret = -ENODEV; | |
842 | goto err_wrong_chan; | |
843 | } | |
844 | ||
845 | echan->alloced = true; | |
846 | echan->slot[0] = echan->ch_num; | |
847 | ||
9aac9096 | 848 | dev_dbg(dev, "allocated channel %d for %u:%u\n", echan->ch_num, |
0e772c67 | 849 | EDMA_CTLR(echan->ch_num), EDMA_CHAN_SLOT(echan->ch_num)); |
c2dde5f8 MP |
850 | |
851 | return 0; | |
852 | ||
853 | err_wrong_chan: | |
854 | edma_free_channel(a_ch_num); | |
855 | err_no_chan: | |
856 | return ret; | |
857 | } | |
858 | ||
859 | /* Free channel resources */ | |
860 | static void edma_free_chan_resources(struct dma_chan *chan) | |
861 | { | |
862 | struct edma_chan *echan = to_edma_chan(chan); | |
863 | struct device *dev = chan->device->dev; | |
864 | int i; | |
865 | ||
866 | /* Terminate transfers */ | |
867 | edma_stop(echan->ch_num); | |
868 | ||
869 | vchan_free_chan_resources(&echan->vchan); | |
870 | ||
871 | /* Free EDMA PaRAM slots */ | |
872 | for (i = 1; i < EDMA_MAX_SLOTS; i++) { | |
873 | if (echan->slot[i] >= 0) { | |
874 | edma_free_slot(echan->slot[i]); | |
875 | echan->slot[i] = -1; | |
876 | } | |
877 | } | |
878 | ||
879 | /* Free EDMA channel */ | |
880 | if (echan->alloced) { | |
881 | edma_free_channel(echan->ch_num); | |
882 | echan->alloced = false; | |
883 | } | |
884 | ||
0e772c67 | 885 | dev_dbg(dev, "freeing channel for %u\n", echan->ch_num); |
c2dde5f8 MP |
886 | } |
887 | ||
888 | /* Send pending descriptor to hardware */ | |
889 | static void edma_issue_pending(struct dma_chan *chan) | |
890 | { | |
891 | struct edma_chan *echan = to_edma_chan(chan); | |
892 | unsigned long flags; | |
893 | ||
894 | spin_lock_irqsave(&echan->vchan.lock, flags); | |
895 | if (vchan_issue_pending(&echan->vchan) && !echan->edesc) | |
896 | edma_execute(echan); | |
897 | spin_unlock_irqrestore(&echan->vchan.lock, flags); | |
898 | } | |
899 | ||
740b41f7 TG |
900 | static u32 edma_residue(struct edma_desc *edesc) |
901 | { | |
902 | bool dst = edesc->direction == DMA_DEV_TO_MEM; | |
903 | struct edma_pset *pset = edesc->pset; | |
904 | dma_addr_t done, pos; | |
905 | int i; | |
906 | ||
907 | /* | |
908 | * We always read the dst/src position from the first RamPar | |
909 | * pset. That's the one which is active now. | |
910 | */ | |
911 | pos = edma_get_position(edesc->echan->slot[0], dst); | |
912 | ||
913 | /* | |
914 | * Cyclic is simple. Just subtract pset[0].addr from pos. | |
915 | * | |
916 | * We never update edesc->residue in the cyclic case, so we | |
917 | * can tell the remaining room to the end of the circular | |
918 | * buffer. | |
919 | */ | |
920 | if (edesc->cyclic) { | |
921 | done = pos - pset->addr; | |
922 | edesc->residue_stat = edesc->residue - done; | |
923 | return edesc->residue_stat; | |
924 | } | |
925 | ||
926 | /* | |
927 | * For SG operation we catch up with the last processed | |
928 | * status. | |
929 | */ | |
930 | pset += edesc->processed_stat; | |
931 | ||
932 | for (i = edesc->processed_stat; i < edesc->processed; i++, pset++) { | |
933 | /* | |
934 | * If we are inside this pset address range, we know | |
935 | * this is the active one. Get the current delta and | |
936 | * stop walking the psets. | |
937 | */ | |
938 | if (pos >= pset->addr && pos < pset->addr + pset->len) | |
939 | return edesc->residue_stat - (pos - pset->addr); | |
940 | ||
941 | /* Otherwise mark it done and update residue_stat. */ | |
942 | edesc->processed_stat++; | |
943 | edesc->residue_stat -= pset->len; | |
944 | } | |
945 | return edesc->residue_stat; | |
946 | } | |
947 | ||
c2dde5f8 MP |
948 | /* Check request completion status */ |
949 | static enum dma_status edma_tx_status(struct dma_chan *chan, | |
950 | dma_cookie_t cookie, | |
951 | struct dma_tx_state *txstate) | |
952 | { | |
953 | struct edma_chan *echan = to_edma_chan(chan); | |
954 | struct virt_dma_desc *vdesc; | |
955 | enum dma_status ret; | |
956 | unsigned long flags; | |
957 | ||
958 | ret = dma_cookie_status(chan, cookie, txstate); | |
9d386ec5 | 959 | if (ret == DMA_COMPLETE || !txstate) |
c2dde5f8 MP |
960 | return ret; |
961 | ||
962 | spin_lock_irqsave(&echan->vchan.lock, flags); | |
de135939 | 963 | if (echan->edesc && echan->edesc->vdesc.tx.cookie == cookie) |
740b41f7 | 964 | txstate->residue = edma_residue(echan->edesc); |
de135939 TG |
965 | else if ((vdesc = vchan_find_desc(&echan->vchan, cookie))) |
966 | txstate->residue = to_edma_desc(&vdesc->tx)->residue; | |
c2dde5f8 MP |
967 | spin_unlock_irqrestore(&echan->vchan.lock, flags); |
968 | ||
969 | return ret; | |
970 | } | |
971 | ||
972 | static void __init edma_chan_init(struct edma_cc *ecc, | |
973 | struct dma_device *dma, | |
974 | struct edma_chan *echans) | |
975 | { | |
976 | int i, j; | |
977 | ||
978 | for (i = 0; i < EDMA_CHANS; i++) { | |
979 | struct edma_chan *echan = &echans[i]; | |
980 | echan->ch_num = EDMA_CTLR_CHAN(ecc->ctlr, i); | |
981 | echan->ecc = ecc; | |
982 | echan->vchan.desc_free = edma_desc_free; | |
983 | ||
984 | vchan_init(&echan->vchan, dma); | |
985 | ||
986 | INIT_LIST_HEAD(&echan->node); | |
987 | for (j = 0; j < EDMA_MAX_SLOTS; j++) | |
988 | echan->slot[j] = -1; | |
989 | } | |
990 | } | |
991 | ||
2c88ee6b PU |
992 | #define EDMA_DMA_BUSWIDTHS (BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \ |
993 | BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \ | |
e4a899d9 | 994 | BIT(DMA_SLAVE_BUSWIDTH_3_BYTES) | \ |
2c88ee6b PU |
995 | BIT(DMA_SLAVE_BUSWIDTH_4_BYTES)) |
996 | ||
997 | static int edma_dma_device_slave_caps(struct dma_chan *dchan, | |
998 | struct dma_slave_caps *caps) | |
999 | { | |
1000 | caps->src_addr_widths = EDMA_DMA_BUSWIDTHS; | |
1001 | caps->dstn_addr_widths = EDMA_DMA_BUSWIDTHS; | |
1002 | caps->directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV); | |
1003 | caps->cmd_pause = true; | |
1004 | caps->cmd_terminate = true; | |
b7f9bc52 | 1005 | caps->residue_granularity = DMA_RESIDUE_GRANULARITY_BURST; |
2c88ee6b PU |
1006 | |
1007 | return 0; | |
1008 | } | |
1009 | ||
c2dde5f8 MP |
1010 | static void edma_dma_init(struct edma_cc *ecc, struct dma_device *dma, |
1011 | struct device *dev) | |
1012 | { | |
1013 | dma->device_prep_slave_sg = edma_prep_slave_sg; | |
50a9c707 | 1014 | dma->device_prep_dma_cyclic = edma_prep_dma_cyclic; |
8cc3e30b | 1015 | dma->device_prep_dma_memcpy = edma_prep_dma_memcpy; |
c2dde5f8 MP |
1016 | dma->device_alloc_chan_resources = edma_alloc_chan_resources; |
1017 | dma->device_free_chan_resources = edma_free_chan_resources; | |
1018 | dma->device_issue_pending = edma_issue_pending; | |
1019 | dma->device_tx_status = edma_tx_status; | |
1020 | dma->device_control = edma_control; | |
2c88ee6b | 1021 | dma->device_slave_caps = edma_dma_device_slave_caps; |
c2dde5f8 MP |
1022 | dma->dev = dev; |
1023 | ||
8cc3e30b JF |
1024 | /* |
1025 | * code using dma memcpy must make sure alignment of | |
1026 | * length is at dma->copy_align boundary. | |
1027 | */ | |
1028 | dma->copy_align = DMA_SLAVE_BUSWIDTH_4_BYTES; | |
1029 | ||
c2dde5f8 MP |
1030 | INIT_LIST_HEAD(&dma->channels); |
1031 | } | |
1032 | ||
463a1f8b | 1033 | static int edma_probe(struct platform_device *pdev) |
c2dde5f8 MP |
1034 | { |
1035 | struct edma_cc *ecc; | |
1036 | int ret; | |
1037 | ||
94cb0e79 RK |
1038 | ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); |
1039 | if (ret) | |
1040 | return ret; | |
1041 | ||
c2dde5f8 MP |
1042 | ecc = devm_kzalloc(&pdev->dev, sizeof(*ecc), GFP_KERNEL); |
1043 | if (!ecc) { | |
1044 | dev_err(&pdev->dev, "Can't allocate controller\n"); | |
1045 | return -ENOMEM; | |
1046 | } | |
1047 | ||
1048 | ecc->ctlr = pdev->id; | |
1049 | ecc->dummy_slot = edma_alloc_slot(ecc->ctlr, EDMA_SLOT_ANY); | |
1050 | if (ecc->dummy_slot < 0) { | |
1051 | dev_err(&pdev->dev, "Can't allocate PaRAM dummy slot\n"); | |
04d537d9 | 1052 | return ecc->dummy_slot; |
c2dde5f8 MP |
1053 | } |
1054 | ||
1055 | dma_cap_zero(ecc->dma_slave.cap_mask); | |
1056 | dma_cap_set(DMA_SLAVE, ecc->dma_slave.cap_mask); | |
232b223d | 1057 | dma_cap_set(DMA_CYCLIC, ecc->dma_slave.cap_mask); |
8cc3e30b | 1058 | dma_cap_set(DMA_MEMCPY, ecc->dma_slave.cap_mask); |
c2dde5f8 MP |
1059 | |
1060 | edma_dma_init(ecc, &ecc->dma_slave, &pdev->dev); | |
1061 | ||
1062 | edma_chan_init(ecc, &ecc->dma_slave, ecc->slave_chans); | |
1063 | ||
1064 | ret = dma_async_device_register(&ecc->dma_slave); | |
1065 | if (ret) | |
1066 | goto err_reg1; | |
1067 | ||
1068 | platform_set_drvdata(pdev, ecc); | |
1069 | ||
1070 | dev_info(&pdev->dev, "TI EDMA DMA engine driver\n"); | |
1071 | ||
1072 | return 0; | |
1073 | ||
1074 | err_reg1: | |
1075 | edma_free_slot(ecc->dummy_slot); | |
1076 | return ret; | |
1077 | } | |
1078 | ||
4bf27b8b | 1079 | static int edma_remove(struct platform_device *pdev) |
c2dde5f8 MP |
1080 | { |
1081 | struct device *dev = &pdev->dev; | |
1082 | struct edma_cc *ecc = dev_get_drvdata(dev); | |
1083 | ||
1084 | dma_async_device_unregister(&ecc->dma_slave); | |
1085 | edma_free_slot(ecc->dummy_slot); | |
1086 | ||
1087 | return 0; | |
1088 | } | |
1089 | ||
1090 | static struct platform_driver edma_driver = { | |
1091 | .probe = edma_probe, | |
a7d6e3ec | 1092 | .remove = edma_remove, |
c2dde5f8 MP |
1093 | .driver = { |
1094 | .name = "edma-dma-engine", | |
1095 | .owner = THIS_MODULE, | |
1096 | }, | |
1097 | }; | |
1098 | ||
1099 | bool edma_filter_fn(struct dma_chan *chan, void *param) | |
1100 | { | |
1101 | if (chan->device->dev->driver == &edma_driver.driver) { | |
1102 | struct edma_chan *echan = to_edma_chan(chan); | |
1103 | unsigned ch_req = *(unsigned *)param; | |
1104 | return ch_req == echan->ch_num; | |
1105 | } | |
1106 | return false; | |
1107 | } | |
1108 | EXPORT_SYMBOL(edma_filter_fn); | |
1109 | ||
c2dde5f8 MP |
1110 | static int edma_init(void) |
1111 | { | |
5305e4d6 | 1112 | return platform_driver_register(&edma_driver); |
c2dde5f8 MP |
1113 | } |
1114 | subsys_initcall(edma_init); | |
1115 | ||
1116 | static void __exit edma_exit(void) | |
1117 | { | |
c2dde5f8 MP |
1118 | platform_driver_unregister(&edma_driver); |
1119 | } | |
1120 | module_exit(edma_exit); | |
1121 | ||
d71505b6 | 1122 | MODULE_AUTHOR("Matt Porter <matt.porter@linaro.org>"); |
c2dde5f8 MP |
1123 | MODULE_DESCRIPTION("TI EDMA DMA engine driver"); |
1124 | MODULE_LICENSE("GPL v2"); |