Commit | Line | Data |
---|---|---|
7bedaa55 RK |
1 | /* |
2 | * OMAP DMAengine support | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | */ | |
8 | #include <linux/dmaengine.h> | |
9 | #include <linux/dma-mapping.h> | |
10 | #include <linux/err.h> | |
11 | #include <linux/init.h> | |
12 | #include <linux/interrupt.h> | |
13 | #include <linux/list.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/omap-dma.h> | |
16 | #include <linux/platform_device.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/spinlock.h> | |
19 | ||
20 | #include "virt-dma.h" | |
7d7e1eba | 21 | |
7bedaa55 RK |
22 | struct omap_dmadev { |
23 | struct dma_device ddev; | |
24 | spinlock_t lock; | |
25 | struct tasklet_struct task; | |
26 | struct list_head pending; | |
27 | }; | |
28 | ||
29 | struct omap_chan { | |
30 | struct virt_dma_chan vc; | |
31 | struct list_head node; | |
32 | ||
33 | struct dma_slave_config cfg; | |
34 | unsigned dma_sig; | |
3a774ea9 | 35 | bool cyclic; |
2dcdf570 | 36 | bool paused; |
7bedaa55 RK |
37 | |
38 | int dma_ch; | |
39 | struct omap_desc *desc; | |
40 | unsigned sgidx; | |
41 | }; | |
42 | ||
43 | struct omap_sg { | |
44 | dma_addr_t addr; | |
45 | uint32_t en; /* number of elements (24-bit) */ | |
46 | uint32_t fn; /* number of frames (16-bit) */ | |
47 | }; | |
48 | ||
49 | struct omap_desc { | |
50 | struct virt_dma_desc vd; | |
51 | enum dma_transfer_direction dir; | |
52 | dma_addr_t dev_addr; | |
53 | ||
7c836bc7 | 54 | int16_t fi; /* for OMAP_DMA_SYNC_PACKET */ |
7bedaa55 RK |
55 | uint8_t es; /* OMAP_DMA_DATA_TYPE_xxx */ |
56 | uint8_t sync_mode; /* OMAP_DMA_SYNC_xxx */ | |
57 | uint8_t sync_type; /* OMAP_DMA_xxx_SYNC* */ | |
58 | uint8_t periph_port; /* Peripheral port */ | |
59 | ||
60 | unsigned sglen; | |
61 | struct omap_sg sg[0]; | |
62 | }; | |
63 | ||
64 | static const unsigned es_bytes[] = { | |
65 | [OMAP_DMA_DATA_TYPE_S8] = 1, | |
66 | [OMAP_DMA_DATA_TYPE_S16] = 2, | |
67 | [OMAP_DMA_DATA_TYPE_S32] = 4, | |
68 | }; | |
69 | ||
70 | static inline struct omap_dmadev *to_omap_dma_dev(struct dma_device *d) | |
71 | { | |
72 | return container_of(d, struct omap_dmadev, ddev); | |
73 | } | |
74 | ||
75 | static inline struct omap_chan *to_omap_dma_chan(struct dma_chan *c) | |
76 | { | |
77 | return container_of(c, struct omap_chan, vc.chan); | |
78 | } | |
79 | ||
80 | static inline struct omap_desc *to_omap_dma_desc(struct dma_async_tx_descriptor *t) | |
81 | { | |
82 | return container_of(t, struct omap_desc, vd.tx); | |
83 | } | |
84 | ||
85 | static void omap_dma_desc_free(struct virt_dma_desc *vd) | |
86 | { | |
87 | kfree(container_of(vd, struct omap_desc, vd)); | |
88 | } | |
89 | ||
90 | static void omap_dma_start_sg(struct omap_chan *c, struct omap_desc *d, | |
91 | unsigned idx) | |
92 | { | |
93 | struct omap_sg *sg = d->sg + idx; | |
94 | ||
95 | if (d->dir == DMA_DEV_TO_MEM) | |
96 | omap_set_dma_dest_params(c->dma_ch, OMAP_DMA_PORT_EMIFF, | |
97 | OMAP_DMA_AMODE_POST_INC, sg->addr, 0, 0); | |
98 | else | |
99 | omap_set_dma_src_params(c->dma_ch, OMAP_DMA_PORT_EMIFF, | |
100 | OMAP_DMA_AMODE_POST_INC, sg->addr, 0, 0); | |
101 | ||
102 | omap_set_dma_transfer_params(c->dma_ch, d->es, sg->en, sg->fn, | |
103 | d->sync_mode, c->dma_sig, d->sync_type); | |
104 | ||
105 | omap_start_dma(c->dma_ch); | |
106 | } | |
107 | ||
108 | static void omap_dma_start_desc(struct omap_chan *c) | |
109 | { | |
110 | struct virt_dma_desc *vd = vchan_next_desc(&c->vc); | |
111 | struct omap_desc *d; | |
112 | ||
113 | if (!vd) { | |
114 | c->desc = NULL; | |
115 | return; | |
116 | } | |
117 | ||
118 | list_del(&vd->node); | |
119 | ||
120 | c->desc = d = to_omap_dma_desc(&vd->tx); | |
121 | c->sgidx = 0; | |
122 | ||
123 | if (d->dir == DMA_DEV_TO_MEM) | |
124 | omap_set_dma_src_params(c->dma_ch, d->periph_port, | |
7c836bc7 | 125 | OMAP_DMA_AMODE_CONSTANT, d->dev_addr, 0, d->fi); |
7bedaa55 RK |
126 | else |
127 | omap_set_dma_dest_params(c->dma_ch, d->periph_port, | |
7c836bc7 | 128 | OMAP_DMA_AMODE_CONSTANT, d->dev_addr, 0, d->fi); |
7bedaa55 RK |
129 | |
130 | omap_dma_start_sg(c, d, 0); | |
131 | } | |
132 | ||
133 | static void omap_dma_callback(int ch, u16 status, void *data) | |
134 | { | |
135 | struct omap_chan *c = data; | |
136 | struct omap_desc *d; | |
137 | unsigned long flags; | |
138 | ||
139 | spin_lock_irqsave(&c->vc.lock, flags); | |
140 | d = c->desc; | |
141 | if (d) { | |
3a774ea9 RK |
142 | if (!c->cyclic) { |
143 | if (++c->sgidx < d->sglen) { | |
144 | omap_dma_start_sg(c, d, c->sgidx); | |
145 | } else { | |
146 | omap_dma_start_desc(c); | |
147 | vchan_cookie_complete(&d->vd); | |
148 | } | |
7bedaa55 | 149 | } else { |
3a774ea9 | 150 | vchan_cyclic_callback(&d->vd); |
7bedaa55 RK |
151 | } |
152 | } | |
153 | spin_unlock_irqrestore(&c->vc.lock, flags); | |
154 | } | |
155 | ||
156 | /* | |
157 | * This callback schedules all pending channels. We could be more | |
158 | * clever here by postponing allocation of the real DMA channels to | |
159 | * this point, and freeing them when our virtual channel becomes idle. | |
160 | * | |
161 | * We would then need to deal with 'all channels in-use' | |
162 | */ | |
163 | static void omap_dma_sched(unsigned long data) | |
164 | { | |
165 | struct omap_dmadev *d = (struct omap_dmadev *)data; | |
166 | LIST_HEAD(head); | |
167 | ||
168 | spin_lock_irq(&d->lock); | |
169 | list_splice_tail_init(&d->pending, &head); | |
170 | spin_unlock_irq(&d->lock); | |
171 | ||
172 | while (!list_empty(&head)) { | |
173 | struct omap_chan *c = list_first_entry(&head, | |
174 | struct omap_chan, node); | |
175 | ||
176 | spin_lock_irq(&c->vc.lock); | |
177 | list_del_init(&c->node); | |
178 | omap_dma_start_desc(c); | |
179 | spin_unlock_irq(&c->vc.lock); | |
180 | } | |
181 | } | |
182 | ||
183 | static int omap_dma_alloc_chan_resources(struct dma_chan *chan) | |
184 | { | |
185 | struct omap_chan *c = to_omap_dma_chan(chan); | |
186 | ||
187 | dev_info(c->vc.chan.device->dev, "allocating channel for %u\n", c->dma_sig); | |
188 | ||
189 | return omap_request_dma(c->dma_sig, "DMA engine", | |
190 | omap_dma_callback, c, &c->dma_ch); | |
191 | } | |
192 | ||
193 | static void omap_dma_free_chan_resources(struct dma_chan *chan) | |
194 | { | |
195 | struct omap_chan *c = to_omap_dma_chan(chan); | |
196 | ||
197 | vchan_free_chan_resources(&c->vc); | |
198 | omap_free_dma(c->dma_ch); | |
199 | ||
200 | dev_info(c->vc.chan.device->dev, "freeing channel for %u\n", c->dma_sig); | |
201 | } | |
202 | ||
3850e22f RK |
203 | static size_t omap_dma_sg_size(struct omap_sg *sg) |
204 | { | |
205 | return sg->en * sg->fn; | |
206 | } | |
207 | ||
208 | static size_t omap_dma_desc_size(struct omap_desc *d) | |
209 | { | |
210 | unsigned i; | |
211 | size_t size; | |
212 | ||
213 | for (size = i = 0; i < d->sglen; i++) | |
214 | size += omap_dma_sg_size(&d->sg[i]); | |
215 | ||
216 | return size * es_bytes[d->es]; | |
217 | } | |
218 | ||
219 | static size_t omap_dma_desc_size_pos(struct omap_desc *d, dma_addr_t addr) | |
220 | { | |
221 | unsigned i; | |
222 | size_t size, es_size = es_bytes[d->es]; | |
223 | ||
224 | for (size = i = 0; i < d->sglen; i++) { | |
225 | size_t this_size = omap_dma_sg_size(&d->sg[i]) * es_size; | |
226 | ||
227 | if (size) | |
228 | size += this_size; | |
229 | else if (addr >= d->sg[i].addr && | |
230 | addr < d->sg[i].addr + this_size) | |
231 | size += d->sg[i].addr + this_size - addr; | |
232 | } | |
233 | return size; | |
234 | } | |
235 | ||
7bedaa55 RK |
236 | static enum dma_status omap_dma_tx_status(struct dma_chan *chan, |
237 | dma_cookie_t cookie, struct dma_tx_state *txstate) | |
238 | { | |
3850e22f RK |
239 | struct omap_chan *c = to_omap_dma_chan(chan); |
240 | struct virt_dma_desc *vd; | |
241 | enum dma_status ret; | |
242 | unsigned long flags; | |
243 | ||
244 | ret = dma_cookie_status(chan, cookie, txstate); | |
245 | if (ret == DMA_SUCCESS || !txstate) | |
246 | return ret; | |
247 | ||
248 | spin_lock_irqsave(&c->vc.lock, flags); | |
249 | vd = vchan_find_desc(&c->vc, cookie); | |
250 | if (vd) { | |
251 | txstate->residue = omap_dma_desc_size(to_omap_dma_desc(&vd->tx)); | |
252 | } else if (c->desc && c->desc->vd.tx.cookie == cookie) { | |
253 | struct omap_desc *d = c->desc; | |
254 | dma_addr_t pos; | |
255 | ||
256 | if (d->dir == DMA_MEM_TO_DEV) | |
257 | pos = omap_get_dma_src_pos(c->dma_ch); | |
258 | else if (d->dir == DMA_DEV_TO_MEM) | |
259 | pos = omap_get_dma_dst_pos(c->dma_ch); | |
260 | else | |
261 | pos = 0; | |
262 | ||
263 | txstate->residue = omap_dma_desc_size_pos(d, pos); | |
264 | } else { | |
265 | txstate->residue = 0; | |
266 | } | |
267 | spin_unlock_irqrestore(&c->vc.lock, flags); | |
268 | ||
269 | return ret; | |
7bedaa55 RK |
270 | } |
271 | ||
272 | static void omap_dma_issue_pending(struct dma_chan *chan) | |
273 | { | |
274 | struct omap_chan *c = to_omap_dma_chan(chan); | |
275 | unsigned long flags; | |
276 | ||
277 | spin_lock_irqsave(&c->vc.lock, flags); | |
278 | if (vchan_issue_pending(&c->vc) && !c->desc) { | |
279 | struct omap_dmadev *d = to_omap_dma_dev(chan->device); | |
280 | spin_lock(&d->lock); | |
281 | if (list_empty(&c->node)) | |
282 | list_add_tail(&c->node, &d->pending); | |
283 | spin_unlock(&d->lock); | |
284 | tasklet_schedule(&d->task); | |
285 | } | |
286 | spin_unlock_irqrestore(&c->vc.lock, flags); | |
287 | } | |
288 | ||
289 | static struct dma_async_tx_descriptor *omap_dma_prep_slave_sg( | |
290 | struct dma_chan *chan, struct scatterlist *sgl, unsigned sglen, | |
291 | enum dma_transfer_direction dir, unsigned long tx_flags, void *context) | |
292 | { | |
293 | struct omap_chan *c = to_omap_dma_chan(chan); | |
294 | enum dma_slave_buswidth dev_width; | |
295 | struct scatterlist *sgent; | |
296 | struct omap_desc *d; | |
297 | dma_addr_t dev_addr; | |
298 | unsigned i, j = 0, es, en, frame_bytes, sync_type; | |
299 | u32 burst; | |
300 | ||
301 | if (dir == DMA_DEV_TO_MEM) { | |
302 | dev_addr = c->cfg.src_addr; | |
303 | dev_width = c->cfg.src_addr_width; | |
304 | burst = c->cfg.src_maxburst; | |
305 | sync_type = OMAP_DMA_SRC_SYNC; | |
306 | } else if (dir == DMA_MEM_TO_DEV) { | |
307 | dev_addr = c->cfg.dst_addr; | |
308 | dev_width = c->cfg.dst_addr_width; | |
309 | burst = c->cfg.dst_maxburst; | |
310 | sync_type = OMAP_DMA_DST_SYNC; | |
311 | } else { | |
312 | dev_err(chan->device->dev, "%s: bad direction?\n", __func__); | |
313 | return NULL; | |
314 | } | |
315 | ||
316 | /* Bus width translates to the element size (ES) */ | |
317 | switch (dev_width) { | |
318 | case DMA_SLAVE_BUSWIDTH_1_BYTE: | |
319 | es = OMAP_DMA_DATA_TYPE_S8; | |
320 | break; | |
321 | case DMA_SLAVE_BUSWIDTH_2_BYTES: | |
322 | es = OMAP_DMA_DATA_TYPE_S16; | |
323 | break; | |
324 | case DMA_SLAVE_BUSWIDTH_4_BYTES: | |
325 | es = OMAP_DMA_DATA_TYPE_S32; | |
326 | break; | |
327 | default: /* not reached */ | |
328 | return NULL; | |
329 | } | |
330 | ||
331 | /* Now allocate and setup the descriptor. */ | |
332 | d = kzalloc(sizeof(*d) + sglen * sizeof(d->sg[0]), GFP_ATOMIC); | |
333 | if (!d) | |
334 | return NULL; | |
335 | ||
336 | d->dir = dir; | |
337 | d->dev_addr = dev_addr; | |
338 | d->es = es; | |
339 | d->sync_mode = OMAP_DMA_SYNC_FRAME; | |
340 | d->sync_type = sync_type; | |
341 | d->periph_port = OMAP_DMA_PORT_TIPB; | |
342 | ||
343 | /* | |
344 | * Build our scatterlist entries: each contains the address, | |
345 | * the number of elements (EN) in each frame, and the number of | |
346 | * frames (FN). Number of bytes for this entry = ES * EN * FN. | |
347 | * | |
348 | * Burst size translates to number of elements with frame sync. | |
349 | * Note: DMA engine defines burst to be the number of dev-width | |
350 | * transfers. | |
351 | */ | |
352 | en = burst; | |
353 | frame_bytes = es_bytes[es] * en; | |
354 | for_each_sg(sgl, sgent, sglen, i) { | |
355 | d->sg[j].addr = sg_dma_address(sgent); | |
356 | d->sg[j].en = en; | |
357 | d->sg[j].fn = sg_dma_len(sgent) / frame_bytes; | |
358 | j++; | |
359 | } | |
360 | ||
361 | d->sglen = j; | |
362 | ||
363 | return vchan_tx_prep(&c->vc, &d->vd, tx_flags); | |
364 | } | |
365 | ||
3a774ea9 RK |
366 | static struct dma_async_tx_descriptor *omap_dma_prep_dma_cyclic( |
367 | struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len, | |
ec8b5e48 PU |
368 | size_t period_len, enum dma_transfer_direction dir, unsigned long flags, |
369 | void *context) | |
3a774ea9 RK |
370 | { |
371 | struct omap_chan *c = to_omap_dma_chan(chan); | |
372 | enum dma_slave_buswidth dev_width; | |
373 | struct omap_desc *d; | |
374 | dma_addr_t dev_addr; | |
375 | unsigned es, sync_type; | |
376 | u32 burst; | |
377 | ||
378 | if (dir == DMA_DEV_TO_MEM) { | |
379 | dev_addr = c->cfg.src_addr; | |
380 | dev_width = c->cfg.src_addr_width; | |
381 | burst = c->cfg.src_maxburst; | |
382 | sync_type = OMAP_DMA_SRC_SYNC; | |
383 | } else if (dir == DMA_MEM_TO_DEV) { | |
384 | dev_addr = c->cfg.dst_addr; | |
385 | dev_width = c->cfg.dst_addr_width; | |
386 | burst = c->cfg.dst_maxburst; | |
387 | sync_type = OMAP_DMA_DST_SYNC; | |
388 | } else { | |
389 | dev_err(chan->device->dev, "%s: bad direction?\n", __func__); | |
390 | return NULL; | |
391 | } | |
392 | ||
393 | /* Bus width translates to the element size (ES) */ | |
394 | switch (dev_width) { | |
395 | case DMA_SLAVE_BUSWIDTH_1_BYTE: | |
396 | es = OMAP_DMA_DATA_TYPE_S8; | |
397 | break; | |
398 | case DMA_SLAVE_BUSWIDTH_2_BYTES: | |
399 | es = OMAP_DMA_DATA_TYPE_S16; | |
400 | break; | |
401 | case DMA_SLAVE_BUSWIDTH_4_BYTES: | |
402 | es = OMAP_DMA_DATA_TYPE_S32; | |
403 | break; | |
404 | default: /* not reached */ | |
405 | return NULL; | |
406 | } | |
407 | ||
408 | /* Now allocate and setup the descriptor. */ | |
409 | d = kzalloc(sizeof(*d) + sizeof(d->sg[0]), GFP_ATOMIC); | |
410 | if (!d) | |
411 | return NULL; | |
412 | ||
413 | d->dir = dir; | |
414 | d->dev_addr = dev_addr; | |
415 | d->fi = burst; | |
416 | d->es = es; | |
ccffa387 PU |
417 | if (burst) |
418 | d->sync_mode = OMAP_DMA_SYNC_PACKET; | |
419 | else | |
420 | d->sync_mode = OMAP_DMA_SYNC_ELEMENT; | |
3a774ea9 RK |
421 | d->sync_type = sync_type; |
422 | d->periph_port = OMAP_DMA_PORT_MPUI; | |
423 | d->sg[0].addr = buf_addr; | |
424 | d->sg[0].en = period_len / es_bytes[es]; | |
425 | d->sg[0].fn = buf_len / period_len; | |
426 | d->sglen = 1; | |
427 | ||
428 | if (!c->cyclic) { | |
429 | c->cyclic = true; | |
430 | omap_dma_link_lch(c->dma_ch, c->dma_ch); | |
2dde5b90 PU |
431 | |
432 | if (flags & DMA_PREP_INTERRUPT) | |
433 | omap_enable_dma_irq(c->dma_ch, OMAP_DMA_FRAME_IRQ); | |
434 | ||
3a774ea9 RK |
435 | omap_disable_dma_irq(c->dma_ch, OMAP_DMA_BLOCK_IRQ); |
436 | } | |
437 | ||
27615a97 | 438 | if (dma_omap2plus()) { |
3a774ea9 RK |
439 | omap_set_dma_src_burst_mode(c->dma_ch, OMAP_DMA_DATA_BURST_16); |
440 | omap_set_dma_dest_burst_mode(c->dma_ch, OMAP_DMA_DATA_BURST_16); | |
441 | } | |
442 | ||
2dde5b90 | 443 | return vchan_tx_prep(&c->vc, &d->vd, flags); |
3a774ea9 RK |
444 | } |
445 | ||
7bedaa55 RK |
446 | static int omap_dma_slave_config(struct omap_chan *c, struct dma_slave_config *cfg) |
447 | { | |
448 | if (cfg->src_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES || | |
449 | cfg->dst_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES) | |
450 | return -EINVAL; | |
451 | ||
452 | memcpy(&c->cfg, cfg, sizeof(c->cfg)); | |
453 | ||
454 | return 0; | |
455 | } | |
456 | ||
457 | static int omap_dma_terminate_all(struct omap_chan *c) | |
458 | { | |
459 | struct omap_dmadev *d = to_omap_dma_dev(c->vc.chan.device); | |
460 | unsigned long flags; | |
461 | LIST_HEAD(head); | |
462 | ||
463 | spin_lock_irqsave(&c->vc.lock, flags); | |
464 | ||
465 | /* Prevent this channel being scheduled */ | |
466 | spin_lock(&d->lock); | |
467 | list_del_init(&c->node); | |
468 | spin_unlock(&d->lock); | |
469 | ||
470 | /* | |
471 | * Stop DMA activity: we assume the callback will not be called | |
472 | * after omap_stop_dma() returns (even if it does, it will see | |
473 | * c->desc is NULL and exit.) | |
474 | */ | |
475 | if (c->desc) { | |
476 | c->desc = NULL; | |
2dcdf570 PU |
477 | /* Avoid stopping the dma twice */ |
478 | if (!c->paused) | |
479 | omap_stop_dma(c->dma_ch); | |
7bedaa55 RK |
480 | } |
481 | ||
3a774ea9 RK |
482 | if (c->cyclic) { |
483 | c->cyclic = false; | |
2dcdf570 | 484 | c->paused = false; |
3a774ea9 RK |
485 | omap_dma_unlink_lch(c->dma_ch, c->dma_ch); |
486 | } | |
487 | ||
7bedaa55 RK |
488 | vchan_get_all_descriptors(&c->vc, &head); |
489 | spin_unlock_irqrestore(&c->vc.lock, flags); | |
490 | vchan_dma_desc_free_list(&c->vc, &head); | |
491 | ||
492 | return 0; | |
493 | } | |
494 | ||
495 | static int omap_dma_pause(struct omap_chan *c) | |
496 | { | |
2dcdf570 PU |
497 | /* Pause/Resume only allowed with cyclic mode */ |
498 | if (!c->cyclic) | |
499 | return -EINVAL; | |
500 | ||
501 | if (!c->paused) { | |
502 | omap_stop_dma(c->dma_ch); | |
503 | c->paused = true; | |
504 | } | |
505 | ||
506 | return 0; | |
7bedaa55 RK |
507 | } |
508 | ||
509 | static int omap_dma_resume(struct omap_chan *c) | |
510 | { | |
2dcdf570 PU |
511 | /* Pause/Resume only allowed with cyclic mode */ |
512 | if (!c->cyclic) | |
513 | return -EINVAL; | |
514 | ||
515 | if (c->paused) { | |
516 | omap_start_dma(c->dma_ch); | |
517 | c->paused = false; | |
518 | } | |
519 | ||
520 | return 0; | |
7bedaa55 RK |
521 | } |
522 | ||
523 | static int omap_dma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, | |
524 | unsigned long arg) | |
525 | { | |
526 | struct omap_chan *c = to_omap_dma_chan(chan); | |
527 | int ret; | |
528 | ||
529 | switch (cmd) { | |
530 | case DMA_SLAVE_CONFIG: | |
531 | ret = omap_dma_slave_config(c, (struct dma_slave_config *)arg); | |
532 | break; | |
533 | ||
534 | case DMA_TERMINATE_ALL: | |
535 | ret = omap_dma_terminate_all(c); | |
536 | break; | |
537 | ||
538 | case DMA_PAUSE: | |
539 | ret = omap_dma_pause(c); | |
540 | break; | |
541 | ||
542 | case DMA_RESUME: | |
543 | ret = omap_dma_resume(c); | |
544 | break; | |
545 | ||
546 | default: | |
547 | ret = -ENXIO; | |
548 | break; | |
549 | } | |
550 | ||
551 | return ret; | |
552 | } | |
553 | ||
554 | static int omap_dma_chan_init(struct omap_dmadev *od, int dma_sig) | |
555 | { | |
556 | struct omap_chan *c; | |
557 | ||
558 | c = kzalloc(sizeof(*c), GFP_KERNEL); | |
559 | if (!c) | |
560 | return -ENOMEM; | |
561 | ||
562 | c->dma_sig = dma_sig; | |
563 | c->vc.desc_free = omap_dma_desc_free; | |
564 | vchan_init(&c->vc, &od->ddev); | |
565 | INIT_LIST_HEAD(&c->node); | |
566 | ||
567 | od->ddev.chancnt++; | |
568 | ||
569 | return 0; | |
570 | } | |
571 | ||
572 | static void omap_dma_free(struct omap_dmadev *od) | |
573 | { | |
574 | tasklet_kill(&od->task); | |
575 | while (!list_empty(&od->ddev.channels)) { | |
576 | struct omap_chan *c = list_first_entry(&od->ddev.channels, | |
577 | struct omap_chan, vc.chan.device_node); | |
578 | ||
579 | list_del(&c->vc.chan.device_node); | |
580 | tasklet_kill(&c->vc.task); | |
581 | kfree(c); | |
582 | } | |
583 | kfree(od); | |
584 | } | |
585 | ||
586 | static int omap_dma_probe(struct platform_device *pdev) | |
587 | { | |
588 | struct omap_dmadev *od; | |
589 | int rc, i; | |
590 | ||
591 | od = kzalloc(sizeof(*od), GFP_KERNEL); | |
592 | if (!od) | |
593 | return -ENOMEM; | |
594 | ||
595 | dma_cap_set(DMA_SLAVE, od->ddev.cap_mask); | |
3a774ea9 | 596 | dma_cap_set(DMA_CYCLIC, od->ddev.cap_mask); |
7bedaa55 RK |
597 | od->ddev.device_alloc_chan_resources = omap_dma_alloc_chan_resources; |
598 | od->ddev.device_free_chan_resources = omap_dma_free_chan_resources; | |
599 | od->ddev.device_tx_status = omap_dma_tx_status; | |
600 | od->ddev.device_issue_pending = omap_dma_issue_pending; | |
601 | od->ddev.device_prep_slave_sg = omap_dma_prep_slave_sg; | |
3a774ea9 | 602 | od->ddev.device_prep_dma_cyclic = omap_dma_prep_dma_cyclic; |
7bedaa55 RK |
603 | od->ddev.device_control = omap_dma_control; |
604 | od->ddev.dev = &pdev->dev; | |
605 | INIT_LIST_HEAD(&od->ddev.channels); | |
606 | INIT_LIST_HEAD(&od->pending); | |
607 | spin_lock_init(&od->lock); | |
608 | ||
609 | tasklet_init(&od->task, omap_dma_sched, (unsigned long)od); | |
610 | ||
611 | for (i = 0; i < 127; i++) { | |
612 | rc = omap_dma_chan_init(od, i); | |
613 | if (rc) { | |
614 | omap_dma_free(od); | |
615 | return rc; | |
616 | } | |
617 | } | |
618 | ||
619 | rc = dma_async_device_register(&od->ddev); | |
620 | if (rc) { | |
621 | pr_warn("OMAP-DMA: failed to register slave DMA engine device: %d\n", | |
622 | rc); | |
623 | omap_dma_free(od); | |
624 | } else { | |
625 | platform_set_drvdata(pdev, od); | |
626 | } | |
627 | ||
628 | dev_info(&pdev->dev, "OMAP DMA engine driver\n"); | |
629 | ||
630 | return rc; | |
631 | } | |
632 | ||
633 | static int omap_dma_remove(struct platform_device *pdev) | |
634 | { | |
635 | struct omap_dmadev *od = platform_get_drvdata(pdev); | |
636 | ||
637 | dma_async_device_unregister(&od->ddev); | |
638 | omap_dma_free(od); | |
639 | ||
640 | return 0; | |
641 | } | |
642 | ||
643 | static struct platform_driver omap_dma_driver = { | |
644 | .probe = omap_dma_probe, | |
645 | .remove = omap_dma_remove, | |
646 | .driver = { | |
647 | .name = "omap-dma-engine", | |
648 | .owner = THIS_MODULE, | |
649 | }, | |
650 | }; | |
651 | ||
652 | bool omap_dma_filter_fn(struct dma_chan *chan, void *param) | |
653 | { | |
654 | if (chan->device->dev->driver == &omap_dma_driver.driver) { | |
655 | struct omap_chan *c = to_omap_dma_chan(chan); | |
656 | unsigned req = *(unsigned *)param; | |
657 | ||
658 | return req == c->dma_sig; | |
659 | } | |
660 | return false; | |
661 | } | |
662 | EXPORT_SYMBOL_GPL(omap_dma_filter_fn); | |
663 | ||
664 | static struct platform_device *pdev; | |
665 | ||
666 | static const struct platform_device_info omap_dma_dev_info = { | |
667 | .name = "omap-dma-engine", | |
668 | .id = -1, | |
669 | .dma_mask = DMA_BIT_MASK(32), | |
670 | }; | |
671 | ||
672 | static int omap_dma_init(void) | |
673 | { | |
674 | int rc = platform_driver_register(&omap_dma_driver); | |
675 | ||
676 | if (rc == 0) { | |
677 | pdev = platform_device_register_full(&omap_dma_dev_info); | |
678 | if (IS_ERR(pdev)) { | |
679 | platform_driver_unregister(&omap_dma_driver); | |
680 | rc = PTR_ERR(pdev); | |
681 | } | |
682 | } | |
683 | return rc; | |
684 | } | |
685 | subsys_initcall(omap_dma_init); | |
686 | ||
687 | static void __exit omap_dma_exit(void) | |
688 | { | |
689 | platform_device_unregister(pdev); | |
690 | platform_driver_unregister(&omap_dma_driver); | |
691 | } | |
692 | module_exit(omap_dma_exit); | |
693 | ||
694 | MODULE_AUTHOR("Russell King"); | |
695 | MODULE_LICENSE("GPL"); |