2 * ALSA PCM interface for the TI DAVINCI processor
4 * Author: Vladimir Barinov, <vbarinov@embeddedalley.com>
5 * Copyright: (C) 2007 MontaVista Software, Inc., <source@mvista.com>
6 * added SRAM ping/pong (C) 2008 Troy Kisky <troy.kisky@boundarydevices.com>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/platform_device.h>
16 #include <linux/slab.h>
17 #include <linux/dma-mapping.h>
18 #include <linux/kernel.h>
19 #include <linux/genalloc.h>
20 #include <linux/platform_data/edma.h>
22 #include <sound/core.h>
23 #include <sound/pcm.h>
24 #include <sound/pcm_params.h>
25 #include <sound/soc.h>
29 #include "davinci-pcm.h"
32 static void print_buf_info(int slot, char *name)
34 struct edmacc_param p;
37 edma_read_slot(slot, &p);
38 printk(KERN_DEBUG "%s: 0x%x, opt=%x, src=%x, a_b_cnt=%x dst=%x\n",
39 name, slot, p.opt, p.src, p.a_b_cnt, p.dst);
40 printk(KERN_DEBUG " src_dst_bidx=%x link_bcntrld=%x src_dst_cidx=%x ccnt=%x\n",
41 p.src_dst_bidx, p.link_bcntrld, p.src_dst_cidx, p.ccnt);
44 static void print_buf_info(int slot, char *name)
49 #define DAVINCI_PCM_FMTBITS (\
50 SNDRV_PCM_FMTBIT_S8 |\
51 SNDRV_PCM_FMTBIT_U8 |\
52 SNDRV_PCM_FMTBIT_S16_LE |\
53 SNDRV_PCM_FMTBIT_S16_BE |\
54 SNDRV_PCM_FMTBIT_U16_LE |\
55 SNDRV_PCM_FMTBIT_U16_BE |\
56 SNDRV_PCM_FMTBIT_S24_LE |\
57 SNDRV_PCM_FMTBIT_S24_BE |\
58 SNDRV_PCM_FMTBIT_U24_LE |\
59 SNDRV_PCM_FMTBIT_U24_BE |\
60 SNDRV_PCM_FMTBIT_S32_LE |\
61 SNDRV_PCM_FMTBIT_S32_BE |\
62 SNDRV_PCM_FMTBIT_U32_LE |\
63 SNDRV_PCM_FMTBIT_U32_BE)
65 static struct snd_pcm_hardware pcm_hardware_playback = {
66 .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
67 SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
68 SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME|
69 SNDRV_PCM_INFO_BATCH),
70 .formats = DAVINCI_PCM_FMTBITS,
71 .rates = SNDRV_PCM_RATE_8000_192000 | SNDRV_PCM_RATE_KNOT,
76 .buffer_bytes_max = 128 * 1024,
77 .period_bytes_min = 32,
78 .period_bytes_max = 8 * 1024,
84 static struct snd_pcm_hardware pcm_hardware_capture = {
85 .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
86 SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
87 SNDRV_PCM_INFO_PAUSE |
88 SNDRV_PCM_INFO_BATCH),
89 .formats = DAVINCI_PCM_FMTBITS,
90 .rates = SNDRV_PCM_RATE_8000_192000 | SNDRV_PCM_RATE_KNOT,
95 .buffer_bytes_max = 128 * 1024,
96 .period_bytes_min = 32,
97 .period_bytes_max = 8 * 1024,
104 * How ping/pong works....
107 * ram_params - copys 2*ping_size from start of SDRAM to iram,
109 * ram_link2 - copys rest of SDRAM to iram in ping_size units,
111 * ram_link - copys entire SDRAM to iram in ping_size uints,
114 * asp_params - same as asp_link[0]
115 * asp_link[0] - copys from lower half of iram to asp port
116 * links to asp_link[1], triggers iram copy event on completion
117 * asp_link[1] - copys from upper half of iram to asp port
118 * links to asp_link[0], triggers iram copy event on completion
119 * triggers interrupt only needed to let upper SOC levels update position
120 * in stream on completion
122 * When playback is started:
127 * ram_params - same as ram_link,
129 * ram_link - same as playback
132 * asp_params - same as playback
133 * asp_link[0] - same as playback
134 * asp_link[1] - same as playback
136 * When capture is started:
139 struct davinci_runtime_data {
141 int period; /* current DMA period */
142 int asp_channel; /* Master DMA channel */
143 int asp_link[2]; /* asp parameter link channel, ping/pong */
144 struct davinci_pcm_dma_params *params; /* DMA params */
148 struct edmacc_param asp_params;
149 struct edmacc_param ram_params;
152 static void davinci_pcm_period_elapsed(struct snd_pcm_substream *substream)
154 struct davinci_runtime_data *prtd = substream->runtime->private_data;
155 struct snd_pcm_runtime *runtime = substream->runtime;
158 if (unlikely(prtd->period >= runtime->periods))
162 static void davinci_pcm_period_reset(struct snd_pcm_substream *substream)
164 struct davinci_runtime_data *prtd = substream->runtime->private_data;
169 * Not used with ping/pong
171 static void davinci_pcm_enqueue_dma(struct snd_pcm_substream *substream)
173 struct davinci_runtime_data *prtd = substream->runtime->private_data;
174 struct snd_pcm_runtime *runtime = substream->runtime;
175 unsigned int period_size;
176 unsigned int dma_offset;
179 unsigned short src_bidx, dst_bidx;
180 unsigned short src_cidx, dst_cidx;
181 unsigned int data_type;
184 unsigned int fifo_level;
186 period_size = snd_pcm_lib_period_bytes(substream);
187 dma_offset = prtd->period * period_size;
188 dma_pos = runtime->dma_addr + dma_offset;
189 fifo_level = prtd->params->fifo_level;
191 pr_debug("davinci_pcm: audio_set_dma_params_play channel = %d "
192 "dma_ptr = %x period_size=%x\n", prtd->asp_link[0], dma_pos,
195 data_type = prtd->params->data_type;
196 count = period_size / data_type;
200 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
202 dst = prtd->params->dma_addr;
203 src_bidx = data_type;
205 src_cidx = data_type * fifo_level;
208 src = prtd->params->dma_addr;
211 dst_bidx = data_type;
213 dst_cidx = data_type * fifo_level;
216 acnt = prtd->params->acnt;
217 edma_set_src(prtd->asp_link[0], src, INCR, W8BIT);
218 edma_set_dest(prtd->asp_link[0], dst, INCR, W8BIT);
220 edma_set_src_index(prtd->asp_link[0], src_bidx, src_cidx);
221 edma_set_dest_index(prtd->asp_link[0], dst_bidx, dst_cidx);
224 edma_set_transfer_params(prtd->asp_link[0], acnt, count, 1, 0,
227 edma_set_transfer_params(prtd->asp_link[0], acnt,
233 static void davinci_pcm_dma_irq(unsigned link, u16 ch_status, void *data)
235 struct snd_pcm_substream *substream = data;
236 struct davinci_runtime_data *prtd = substream->runtime->private_data;
238 print_buf_info(prtd->ram_channel, "i ram_channel");
239 pr_debug("davinci_pcm: link=%d, status=0x%x\n", link, ch_status);
241 if (unlikely(ch_status != EDMA_DMA_COMPLETE))
244 if (snd_pcm_running(substream)) {
245 spin_lock(&prtd->lock);
246 if (prtd->ram_channel < 0) {
247 /* No ping/pong must fix up link dma data*/
248 davinci_pcm_enqueue_dma(substream);
250 davinci_pcm_period_elapsed(substream);
251 spin_unlock(&prtd->lock);
252 snd_pcm_period_elapsed(substream);
256 #ifdef CONFIG_GENERIC_ALLOCATOR
257 static int allocate_sram(struct snd_pcm_substream *substream,
258 struct gen_pool *sram_pool, unsigned size,
259 struct snd_pcm_hardware *ppcm)
261 struct snd_dma_buffer *buf = &substream->dma_buffer;
262 struct snd_dma_buffer *iram_dma = NULL;
263 dma_addr_t iram_phys = 0;
264 void *iram_virt = NULL;
266 if (buf->private_data || !size)
269 ppcm->period_bytes_max = size;
270 iram_virt = gen_pool_dma_alloc(sram_pool, size, &iram_phys);
273 iram_dma = kzalloc(sizeof(*iram_dma), GFP_KERNEL);
276 iram_dma->area = iram_virt;
277 iram_dma->addr = iram_phys;
278 memset(iram_dma->area, 0, size);
279 iram_dma->bytes = size;
280 buf->private_data = iram_dma;
284 gen_pool_free(sram_pool, (unsigned)iram_virt, size);
289 static void davinci_free_sram(struct snd_pcm_substream *substream,
290 struct snd_dma_buffer *iram_dma)
292 struct davinci_runtime_data *prtd = substream->runtime->private_data;
293 struct gen_pool *sram_pool = prtd->params->sram_pool;
295 gen_pool_free(sram_pool, (unsigned) iram_dma->area, iram_dma->bytes);
298 static int allocate_sram(struct snd_pcm_substream *substream,
299 struct gen_pool *sram_pool, unsigned size,
300 struct snd_pcm_hardware *ppcm)
305 static void davinci_free_sram(struct snd_pcm_substream *substream,
306 struct snd_dma_buffer *iram_dma)
312 * Only used with ping/pong.
313 * This is called after runtime->dma_addr, period_bytes and data_type are valid
315 static int ping_pong_dma_setup(struct snd_pcm_substream *substream)
317 unsigned short ram_src_cidx, ram_dst_cidx;
318 struct snd_pcm_runtime *runtime = substream->runtime;
319 struct davinci_runtime_data *prtd = runtime->private_data;
320 struct snd_dma_buffer *iram_dma =
321 (struct snd_dma_buffer *)substream->dma_buffer.private_data;
322 struct davinci_pcm_dma_params *params = prtd->params;
323 unsigned int data_type = params->data_type;
324 unsigned int acnt = params->acnt;
325 /* divide by 2 for ping/pong */
326 unsigned int ping_size = snd_pcm_lib_period_bytes(substream) >> 1;
327 unsigned int fifo_level = prtd->params->fifo_level;
329 if ((data_type == 0) || (data_type > 4)) {
330 printk(KERN_ERR "%s: data_type=%i\n", __func__, data_type);
333 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
334 dma_addr_t asp_src_pong = iram_dma->addr + ping_size;
335 ram_src_cidx = ping_size;
336 ram_dst_cidx = -ping_size;
337 edma_set_src(prtd->asp_link[1], asp_src_pong, INCR, W8BIT);
339 edma_set_src_index(prtd->asp_link[0], data_type,
340 data_type * fifo_level);
341 edma_set_src_index(prtd->asp_link[1], data_type,
342 data_type * fifo_level);
344 edma_set_src(prtd->ram_link, runtime->dma_addr, INCR, W32BIT);
346 dma_addr_t asp_dst_pong = iram_dma->addr + ping_size;
347 ram_src_cidx = -ping_size;
348 ram_dst_cidx = ping_size;
349 edma_set_dest(prtd->asp_link[1], asp_dst_pong, INCR, W8BIT);
351 edma_set_dest_index(prtd->asp_link[0], data_type,
352 data_type * fifo_level);
353 edma_set_dest_index(prtd->asp_link[1], data_type,
354 data_type * fifo_level);
356 edma_set_dest(prtd->ram_link, runtime->dma_addr, INCR, W32BIT);
360 count = ping_size / data_type;
361 edma_set_transfer_params(prtd->asp_link[0], acnt, count,
363 edma_set_transfer_params(prtd->asp_link[1], acnt, count,
366 count = ping_size / (data_type * fifo_level);
367 edma_set_transfer_params(prtd->asp_link[0], acnt, fifo_level,
368 count, fifo_level, ABSYNC);
369 edma_set_transfer_params(prtd->asp_link[1], acnt, fifo_level,
370 count, fifo_level, ABSYNC);
373 edma_set_src_index(prtd->ram_link, ping_size, ram_src_cidx);
374 edma_set_dest_index(prtd->ram_link, ping_size, ram_dst_cidx);
375 edma_set_transfer_params(prtd->ram_link, ping_size, 2,
376 runtime->periods, 2, ASYNC);
378 /* init master params */
379 edma_read_slot(prtd->asp_link[0], &prtd->asp_params);
380 edma_read_slot(prtd->ram_link, &prtd->ram_params);
381 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
382 struct edmacc_param p_ram;
383 /* Copy entire iram buffer before playback started */
384 prtd->ram_params.a_b_cnt = (1 << 16) | (ping_size << 1);
386 prtd->ram_params.src_dst_bidx = (ping_size << 1);
388 prtd->ram_params.src_dst_cidx = (ping_size << 1);
389 prtd->ram_params.ccnt = 1;
391 /* Skip 1st period */
392 edma_read_slot(prtd->ram_link, &p_ram);
393 p_ram.src += (ping_size << 1);
395 edma_write_slot(prtd->ram_link2, &p_ram);
397 * When 1st started, ram -> iram dma channel will fill the
398 * entire iram. Then, whenever a ping/pong asp buffer finishes,
399 * 1/2 iram will be filled.
401 prtd->ram_params.link_bcntrld =
402 EDMA_CHAN_SLOT(prtd->ram_link2) << 5;
407 /* 1 asp tx or rx channel using 2 parameter channels
408 * 1 ram to/from iram channel using 1 parameter channel
411 * ram copy channel kicks off first,
412 * 1st ram copy of entire iram buffer completion kicks off asp channel
413 * asp tcc always kicks off ram copy of 1/2 iram buffer
416 * asp channel starts, tcc kicks off ram copy
418 static int request_ping_pong(struct snd_pcm_substream *substream,
419 struct davinci_runtime_data *prtd,
420 struct snd_dma_buffer *iram_dma)
422 dma_addr_t asp_src_ping;
423 dma_addr_t asp_dst_ping;
425 struct davinci_pcm_dma_params *params = prtd->params;
427 /* Request ram master channel */
428 ret = prtd->ram_channel = edma_alloc_channel(EDMA_CHANNEL_ANY,
429 davinci_pcm_dma_irq, substream,
430 prtd->params->ram_chan_q);
434 /* Request ram link channel */
435 ret = prtd->ram_link = edma_alloc_slot(
436 EDMA_CTLR(prtd->ram_channel), EDMA_SLOT_ANY);
440 ret = prtd->asp_link[1] = edma_alloc_slot(
441 EDMA_CTLR(prtd->asp_channel), EDMA_SLOT_ANY);
445 prtd->ram_link2 = -1;
446 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
447 ret = prtd->ram_link2 = edma_alloc_slot(
448 EDMA_CTLR(prtd->ram_channel), EDMA_SLOT_ANY);
452 /* circle ping-pong buffers */
453 edma_link(prtd->asp_link[0], prtd->asp_link[1]);
454 edma_link(prtd->asp_link[1], prtd->asp_link[0]);
455 /* circle ram buffers */
456 edma_link(prtd->ram_link, prtd->ram_link);
458 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
459 asp_src_ping = iram_dma->addr;
460 asp_dst_ping = params->dma_addr; /* fifo */
462 asp_src_ping = params->dma_addr; /* fifo */
463 asp_dst_ping = iram_dma->addr;
466 edma_set_src(prtd->asp_link[0], asp_src_ping, INCR, W16BIT);
467 edma_set_dest(prtd->asp_link[0], asp_dst_ping, INCR, W16BIT);
468 edma_set_src_index(prtd->asp_link[0], 0, 0);
469 edma_set_dest_index(prtd->asp_link[0], 0, 0);
471 edma_read_slot(prtd->asp_link[0], &prtd->asp_params);
472 prtd->asp_params.opt &= ~(TCCMODE | EDMA_TCC(0x3f) | TCINTEN);
473 prtd->asp_params.opt |= TCCHEN |
474 EDMA_TCC(prtd->ram_channel & 0x3f);
475 edma_write_slot(prtd->asp_link[0], &prtd->asp_params);
478 edma_set_src(prtd->asp_link[1], asp_src_ping, INCR, W16BIT);
479 edma_set_dest(prtd->asp_link[1], asp_dst_ping, INCR, W16BIT);
480 edma_set_src_index(prtd->asp_link[1], 0, 0);
481 edma_set_dest_index(prtd->asp_link[1], 0, 0);
483 edma_read_slot(prtd->asp_link[1], &prtd->asp_params);
484 prtd->asp_params.opt &= ~(TCCMODE | EDMA_TCC(0x3f));
485 /* interrupt after every pong completion */
486 prtd->asp_params.opt |= TCINTEN | TCCHEN |
487 EDMA_TCC(prtd->ram_channel & 0x3f);
488 edma_write_slot(prtd->asp_link[1], &prtd->asp_params);
491 edma_set_src(prtd->ram_link, iram_dma->addr, INCR, W32BIT);
492 edma_set_dest(prtd->ram_link, iram_dma->addr, INCR, W32BIT);
493 pr_debug("%s: audio dma channels/slots in use for ram:%u %u %u,"
494 "for asp:%u %u %u\n", __func__,
495 prtd->ram_channel, prtd->ram_link, prtd->ram_link2,
496 prtd->asp_channel, prtd->asp_link[0],
500 edma_free_channel(prtd->asp_link[1]);
501 prtd->asp_link[1] = -1;
503 edma_free_channel(prtd->ram_link);
506 edma_free_channel(prtd->ram_channel);
507 prtd->ram_channel = -1;
512 static int davinci_pcm_dma_request(struct snd_pcm_substream *substream)
514 struct snd_dma_buffer *iram_dma;
515 struct davinci_runtime_data *prtd = substream->runtime->private_data;
516 struct davinci_pcm_dma_params *params = prtd->params;
522 /* Request asp master DMA channel */
523 ret = prtd->asp_channel = edma_alloc_channel(params->channel,
524 davinci_pcm_dma_irq, substream,
525 prtd->params->asp_chan_q);
529 /* Request asp link channels */
530 ret = prtd->asp_link[0] = edma_alloc_slot(
531 EDMA_CTLR(prtd->asp_channel), EDMA_SLOT_ANY);
535 iram_dma = (struct snd_dma_buffer *)substream->dma_buffer.private_data;
537 if (request_ping_pong(substream, prtd, iram_dma) == 0)
539 printk(KERN_WARNING "%s: dma channel allocation failed,"
540 "not using sram\n", __func__);
543 /* Issue transfer completion IRQ when the channel completes a
544 * transfer, then always reload from the same slot (by a kind
545 * of loopback link). The completion IRQ handler will update
546 * the reload slot with a new buffer.
548 * REVISIT save p_ram here after setting up everything except
549 * the buffer and its length (ccnt) ... use it as a template
550 * so davinci_pcm_enqueue_dma() takes less time in IRQ.
552 edma_read_slot(prtd->asp_link[0], &prtd->asp_params);
553 prtd->asp_params.opt |= TCINTEN |
554 EDMA_TCC(EDMA_CHAN_SLOT(prtd->asp_channel));
555 prtd->asp_params.link_bcntrld = EDMA_CHAN_SLOT(prtd->asp_link[0]) << 5;
556 edma_write_slot(prtd->asp_link[0], &prtd->asp_params);
559 edma_free_channel(prtd->asp_channel);
560 prtd->asp_channel = -1;
565 static int davinci_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
567 struct davinci_runtime_data *prtd = substream->runtime->private_data;
570 spin_lock(&prtd->lock);
573 case SNDRV_PCM_TRIGGER_START:
574 edma_start(prtd->asp_channel);
575 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
576 prtd->ram_channel >= 0) {
577 /* copy 1st iram buffer */
578 edma_start(prtd->ram_channel);
581 case SNDRV_PCM_TRIGGER_RESUME:
582 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
583 edma_resume(prtd->asp_channel);
585 case SNDRV_PCM_TRIGGER_STOP:
586 case SNDRV_PCM_TRIGGER_SUSPEND:
587 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
588 edma_pause(prtd->asp_channel);
595 spin_unlock(&prtd->lock);
600 static int davinci_pcm_prepare(struct snd_pcm_substream *substream)
602 struct davinci_runtime_data *prtd = substream->runtime->private_data;
604 davinci_pcm_period_reset(substream);
605 if (prtd->ram_channel >= 0) {
606 int ret = ping_pong_dma_setup(substream);
610 edma_write_slot(prtd->ram_channel, &prtd->ram_params);
611 edma_write_slot(prtd->asp_channel, &prtd->asp_params);
613 print_buf_info(prtd->ram_channel, "ram_channel");
614 print_buf_info(prtd->ram_link, "ram_link");
615 print_buf_info(prtd->ram_link2, "ram_link2");
616 print_buf_info(prtd->asp_channel, "asp_channel");
617 print_buf_info(prtd->asp_link[0], "asp_link[0]");
618 print_buf_info(prtd->asp_link[1], "asp_link[1]");
621 * There is a phase offset of 2 periods between the position
622 * used by dma setup and the position reported in the pointer
625 * The phase offset, when not using ping-pong buffers, is due to
626 * the two consecutive calls to davinci_pcm_enqueue_dma() below.
628 * Whereas here, with ping-pong buffers, the phase is due to
629 * there being an entire buffer transfer complete before the
630 * first dma completion event triggers davinci_pcm_dma_irq().
632 davinci_pcm_period_elapsed(substream);
633 davinci_pcm_period_elapsed(substream);
637 davinci_pcm_enqueue_dma(substream);
638 davinci_pcm_period_elapsed(substream);
640 /* Copy self-linked parameter RAM entry into master channel */
641 edma_read_slot(prtd->asp_link[0], &prtd->asp_params);
642 edma_write_slot(prtd->asp_channel, &prtd->asp_params);
643 davinci_pcm_enqueue_dma(substream);
644 davinci_pcm_period_elapsed(substream);
649 static snd_pcm_uframes_t
650 davinci_pcm_pointer(struct snd_pcm_substream *substream)
652 struct snd_pcm_runtime *runtime = substream->runtime;
653 struct davinci_runtime_data *prtd = runtime->private_data;
656 unsigned int period_size = snd_pcm_lib_period_bytes(substream);
659 * There is a phase offset of 2 periods between the position used by dma
660 * setup and the position reported in the pointer function. Either +2 in
661 * the dma setup or -2 here in the pointer function (with wrapping,
662 * both) accounts for this offset -- choose the latter since it makes
663 * the first-time setup clearer.
665 spin_lock(&prtd->lock);
666 asp_count = prtd->period - 2;
667 spin_unlock(&prtd->lock);
670 asp_count += runtime->periods;
671 asp_count *= period_size;
673 offset = bytes_to_frames(runtime, asp_count);
674 if (offset >= runtime->buffer_size)
680 static int davinci_pcm_open(struct snd_pcm_substream *substream)
682 struct snd_pcm_runtime *runtime = substream->runtime;
683 struct davinci_runtime_data *prtd;
684 struct snd_pcm_hardware *ppcm;
686 struct snd_soc_pcm_runtime *rtd = substream->private_data;
687 struct davinci_pcm_dma_params *pa;
688 struct davinci_pcm_dma_params *params;
690 pa = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
693 params = &pa[substream->stream];
695 ppcm = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
696 &pcm_hardware_playback : &pcm_hardware_capture;
697 allocate_sram(substream, params->sram_pool, params->sram_size, ppcm);
698 snd_soc_set_runtime_hwparams(substream, ppcm);
699 /* ensure that buffer size is a multiple of period size */
700 ret = snd_pcm_hw_constraint_integer(runtime,
701 SNDRV_PCM_HW_PARAM_PERIODS);
705 prtd = kzalloc(sizeof(struct davinci_runtime_data), GFP_KERNEL);
709 spin_lock_init(&prtd->lock);
710 prtd->params = params;
711 prtd->asp_channel = -1;
712 prtd->asp_link[0] = prtd->asp_link[1] = -1;
713 prtd->ram_channel = -1;
715 prtd->ram_link2 = -1;
717 runtime->private_data = prtd;
719 ret = davinci_pcm_dma_request(substream);
721 printk(KERN_ERR "davinci_pcm: Failed to get dma channels\n");
728 static int davinci_pcm_close(struct snd_pcm_substream *substream)
730 struct snd_pcm_runtime *runtime = substream->runtime;
731 struct davinci_runtime_data *prtd = runtime->private_data;
733 if (prtd->ram_channel >= 0)
734 edma_stop(prtd->ram_channel);
735 if (prtd->asp_channel >= 0)
736 edma_stop(prtd->asp_channel);
737 if (prtd->asp_link[0] >= 0)
738 edma_unlink(prtd->asp_link[0]);
739 if (prtd->asp_link[1] >= 0)
740 edma_unlink(prtd->asp_link[1]);
741 if (prtd->ram_link >= 0)
742 edma_unlink(prtd->ram_link);
744 if (prtd->asp_link[0] >= 0)
745 edma_free_slot(prtd->asp_link[0]);
746 if (prtd->asp_link[1] >= 0)
747 edma_free_slot(prtd->asp_link[1]);
748 if (prtd->asp_channel >= 0)
749 edma_free_channel(prtd->asp_channel);
750 if (prtd->ram_link >= 0)
751 edma_free_slot(prtd->ram_link);
752 if (prtd->ram_link2 >= 0)
753 edma_free_slot(prtd->ram_link2);
754 if (prtd->ram_channel >= 0)
755 edma_free_channel(prtd->ram_channel);
762 static int davinci_pcm_hw_params(struct snd_pcm_substream *substream,
763 struct snd_pcm_hw_params *hw_params)
765 return snd_pcm_lib_malloc_pages(substream,
766 params_buffer_bytes(hw_params));
769 static int davinci_pcm_hw_free(struct snd_pcm_substream *substream)
771 return snd_pcm_lib_free_pages(substream);
774 static int davinci_pcm_mmap(struct snd_pcm_substream *substream,
775 struct vm_area_struct *vma)
777 struct snd_pcm_runtime *runtime = substream->runtime;
779 return dma_mmap_writecombine(substream->pcm->card->dev, vma,
785 static struct snd_pcm_ops davinci_pcm_ops = {
786 .open = davinci_pcm_open,
787 .close = davinci_pcm_close,
788 .ioctl = snd_pcm_lib_ioctl,
789 .hw_params = davinci_pcm_hw_params,
790 .hw_free = davinci_pcm_hw_free,
791 .prepare = davinci_pcm_prepare,
792 .trigger = davinci_pcm_trigger,
793 .pointer = davinci_pcm_pointer,
794 .mmap = davinci_pcm_mmap,
797 static int davinci_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream,
800 struct snd_pcm_substream *substream = pcm->streams[stream].substream;
801 struct snd_dma_buffer *buf = &substream->dma_buffer;
803 buf->dev.type = SNDRV_DMA_TYPE_DEV;
804 buf->dev.dev = pcm->card->dev;
805 buf->private_data = NULL;
806 buf->area = dma_alloc_writecombine(pcm->card->dev, size,
807 &buf->addr, GFP_KERNEL);
809 pr_debug("davinci_pcm: preallocate_dma_buffer: area=%p, addr=%p, "
810 "size=%d\n", (void *) buf->area, (void *) buf->addr, size);
819 static void davinci_pcm_free(struct snd_pcm *pcm)
821 struct snd_pcm_substream *substream;
822 struct snd_dma_buffer *buf;
825 for (stream = 0; stream < 2; stream++) {
826 struct snd_dma_buffer *iram_dma;
827 substream = pcm->streams[stream].substream;
831 buf = &substream->dma_buffer;
835 dma_free_writecombine(pcm->card->dev, buf->bytes,
836 buf->area, buf->addr);
838 iram_dma = buf->private_data;
840 davinci_free_sram(substream, iram_dma);
846 static int davinci_pcm_new(struct snd_soc_pcm_runtime *rtd)
848 struct snd_card *card = rtd->card->snd_card;
849 struct snd_pcm *pcm = rtd->pcm;
852 ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
856 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
857 ret = davinci_pcm_preallocate_dma_buffer(pcm,
858 SNDRV_PCM_STREAM_PLAYBACK,
859 pcm_hardware_playback.buffer_bytes_max);
864 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
865 ret = davinci_pcm_preallocate_dma_buffer(pcm,
866 SNDRV_PCM_STREAM_CAPTURE,
867 pcm_hardware_capture.buffer_bytes_max);
875 static struct snd_soc_platform_driver davinci_soc_platform = {
876 .ops = &davinci_pcm_ops,
877 .pcm_new = davinci_pcm_new,
878 .pcm_free = davinci_pcm_free,
881 int davinci_soc_platform_register(struct device *dev)
883 return snd_soc_register_platform(dev, &davinci_soc_platform);
885 EXPORT_SYMBOL_GPL(davinci_soc_platform_register);
887 void davinci_soc_platform_unregister(struct device *dev)
889 snd_soc_unregister_platform(dev);
891 EXPORT_SYMBOL_GPL(davinci_soc_platform_unregister);
893 MODULE_AUTHOR("Vladimir Barinov");
894 MODULE_DESCRIPTION("TI DAVINCI PCM DMA module");
895 MODULE_LICENSE("GPL");