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 != 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 = (void *)gen_pool_alloc(sram_pool, size);
273 iram_phys = gen_pool_virt_to_phys(sram_pool, (unsigned)iram_virt);
274 iram_dma = kzalloc(sizeof(*iram_dma), GFP_KERNEL);
277 iram_dma->area = iram_virt;
278 iram_dma->addr = iram_phys;
279 memset(iram_dma->area, 0, size);
280 iram_dma->bytes = size;
281 buf->private_data = iram_dma;
285 gen_pool_free(sram_pool, (unsigned)iram_virt, size);
290 static void davinci_free_sram(struct snd_pcm_substream *substream,
291 struct snd_dma_buffer *iram_dma)
293 struct davinci_runtime_data *prtd = substream->runtime->private_data;
294 struct gen_pool *sram_pool = prtd->params->sram_pool;
296 gen_pool_free(sram_pool, (unsigned) iram_dma->area, iram_dma->bytes);
299 static int allocate_sram(struct snd_pcm_substream *substream,
300 struct gen_pool *sram_pool, unsigned size,
301 struct snd_pcm_hardware *ppcm)
306 static void davinci_free_sram(struct snd_pcm_substream *substream,
307 struct snd_dma_buffer *iram_dma)
313 * Only used with ping/pong.
314 * This is called after runtime->dma_addr, period_bytes and data_type are valid
316 static int ping_pong_dma_setup(struct snd_pcm_substream *substream)
318 unsigned short ram_src_cidx, ram_dst_cidx;
319 struct snd_pcm_runtime *runtime = substream->runtime;
320 struct davinci_runtime_data *prtd = runtime->private_data;
321 struct snd_dma_buffer *iram_dma =
322 (struct snd_dma_buffer *)substream->dma_buffer.private_data;
323 struct davinci_pcm_dma_params *params = prtd->params;
324 unsigned int data_type = params->data_type;
325 unsigned int acnt = params->acnt;
326 /* divide by 2 for ping/pong */
327 unsigned int ping_size = snd_pcm_lib_period_bytes(substream) >> 1;
328 unsigned int fifo_level = prtd->params->fifo_level;
330 if ((data_type == 0) || (data_type > 4)) {
331 printk(KERN_ERR "%s: data_type=%i\n", __func__, data_type);
334 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
335 dma_addr_t asp_src_pong = iram_dma->addr + ping_size;
336 ram_src_cidx = ping_size;
337 ram_dst_cidx = -ping_size;
338 edma_set_src(prtd->asp_link[1], asp_src_pong, INCR, W8BIT);
340 edma_set_src_index(prtd->asp_link[0], data_type,
341 data_type * fifo_level);
342 edma_set_src_index(prtd->asp_link[1], data_type,
343 data_type * fifo_level);
345 edma_set_src(prtd->ram_link, runtime->dma_addr, INCR, W32BIT);
347 dma_addr_t asp_dst_pong = iram_dma->addr + ping_size;
348 ram_src_cidx = -ping_size;
349 ram_dst_cidx = ping_size;
350 edma_set_dest(prtd->asp_link[1], asp_dst_pong, INCR, W8BIT);
352 edma_set_dest_index(prtd->asp_link[0], data_type,
353 data_type * fifo_level);
354 edma_set_dest_index(prtd->asp_link[1], data_type,
355 data_type * fifo_level);
357 edma_set_dest(prtd->ram_link, runtime->dma_addr, INCR, W32BIT);
361 count = ping_size / data_type;
362 edma_set_transfer_params(prtd->asp_link[0], acnt, count,
364 edma_set_transfer_params(prtd->asp_link[1], acnt, count,
367 count = ping_size / (data_type * fifo_level);
368 edma_set_transfer_params(prtd->asp_link[0], acnt, fifo_level,
369 count, fifo_level, ABSYNC);
370 edma_set_transfer_params(prtd->asp_link[1], acnt, fifo_level,
371 count, fifo_level, ABSYNC);
374 edma_set_src_index(prtd->ram_link, ping_size, ram_src_cidx);
375 edma_set_dest_index(prtd->ram_link, ping_size, ram_dst_cidx);
376 edma_set_transfer_params(prtd->ram_link, ping_size, 2,
377 runtime->periods, 2, ASYNC);
379 /* init master params */
380 edma_read_slot(prtd->asp_link[0], &prtd->asp_params);
381 edma_read_slot(prtd->ram_link, &prtd->ram_params);
382 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
383 struct edmacc_param p_ram;
384 /* Copy entire iram buffer before playback started */
385 prtd->ram_params.a_b_cnt = (1 << 16) | (ping_size << 1);
387 prtd->ram_params.src_dst_bidx = (ping_size << 1);
389 prtd->ram_params.src_dst_cidx = (ping_size << 1);
390 prtd->ram_params.ccnt = 1;
392 /* Skip 1st period */
393 edma_read_slot(prtd->ram_link, &p_ram);
394 p_ram.src += (ping_size << 1);
396 edma_write_slot(prtd->ram_link2, &p_ram);
398 * When 1st started, ram -> iram dma channel will fill the
399 * entire iram. Then, whenever a ping/pong asp buffer finishes,
400 * 1/2 iram will be filled.
402 prtd->ram_params.link_bcntrld =
403 EDMA_CHAN_SLOT(prtd->ram_link2) << 5;
408 /* 1 asp tx or rx channel using 2 parameter channels
409 * 1 ram to/from iram channel using 1 parameter channel
412 * ram copy channel kicks off first,
413 * 1st ram copy of entire iram buffer completion kicks off asp channel
414 * asp tcc always kicks off ram copy of 1/2 iram buffer
417 * asp channel starts, tcc kicks off ram copy
419 static int request_ping_pong(struct snd_pcm_substream *substream,
420 struct davinci_runtime_data *prtd,
421 struct snd_dma_buffer *iram_dma)
423 dma_addr_t asp_src_ping;
424 dma_addr_t asp_dst_ping;
426 struct davinci_pcm_dma_params *params = prtd->params;
428 /* Request ram master channel */
429 ret = prtd->ram_channel = edma_alloc_channel(EDMA_CHANNEL_ANY,
430 davinci_pcm_dma_irq, substream,
431 prtd->params->ram_chan_q);
435 /* Request ram link channel */
436 ret = prtd->ram_link = edma_alloc_slot(
437 EDMA_CTLR(prtd->ram_channel), EDMA_SLOT_ANY);
441 ret = prtd->asp_link[1] = edma_alloc_slot(
442 EDMA_CTLR(prtd->asp_channel), EDMA_SLOT_ANY);
446 prtd->ram_link2 = -1;
447 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
448 ret = prtd->ram_link2 = edma_alloc_slot(
449 EDMA_CTLR(prtd->ram_channel), EDMA_SLOT_ANY);
453 /* circle ping-pong buffers */
454 edma_link(prtd->asp_link[0], prtd->asp_link[1]);
455 edma_link(prtd->asp_link[1], prtd->asp_link[0]);
456 /* circle ram buffers */
457 edma_link(prtd->ram_link, prtd->ram_link);
459 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
460 asp_src_ping = iram_dma->addr;
461 asp_dst_ping = params->dma_addr; /* fifo */
463 asp_src_ping = params->dma_addr; /* fifo */
464 asp_dst_ping = iram_dma->addr;
467 edma_set_src(prtd->asp_link[0], asp_src_ping, INCR, W16BIT);
468 edma_set_dest(prtd->asp_link[0], asp_dst_ping, INCR, W16BIT);
469 edma_set_src_index(prtd->asp_link[0], 0, 0);
470 edma_set_dest_index(prtd->asp_link[0], 0, 0);
472 edma_read_slot(prtd->asp_link[0], &prtd->asp_params);
473 prtd->asp_params.opt &= ~(TCCMODE | EDMA_TCC(0x3f) | TCINTEN);
474 prtd->asp_params.opt |= TCCHEN |
475 EDMA_TCC(prtd->ram_channel & 0x3f);
476 edma_write_slot(prtd->asp_link[0], &prtd->asp_params);
479 edma_set_src(prtd->asp_link[1], asp_src_ping, INCR, W16BIT);
480 edma_set_dest(prtd->asp_link[1], asp_dst_ping, INCR, W16BIT);
481 edma_set_src_index(prtd->asp_link[1], 0, 0);
482 edma_set_dest_index(prtd->asp_link[1], 0, 0);
484 edma_read_slot(prtd->asp_link[1], &prtd->asp_params);
485 prtd->asp_params.opt &= ~(TCCMODE | EDMA_TCC(0x3f));
486 /* interrupt after every pong completion */
487 prtd->asp_params.opt |= TCINTEN | TCCHEN |
488 EDMA_TCC(prtd->ram_channel & 0x3f);
489 edma_write_slot(prtd->asp_link[1], &prtd->asp_params);
492 edma_set_src(prtd->ram_link, iram_dma->addr, INCR, W32BIT);
493 edma_set_dest(prtd->ram_link, iram_dma->addr, INCR, W32BIT);
494 pr_debug("%s: audio dma channels/slots in use for ram:%u %u %u,"
495 "for asp:%u %u %u\n", __func__,
496 prtd->ram_channel, prtd->ram_link, prtd->ram_link2,
497 prtd->asp_channel, prtd->asp_link[0],
501 edma_free_channel(prtd->asp_link[1]);
502 prtd->asp_link[1] = -1;
504 edma_free_channel(prtd->ram_link);
507 edma_free_channel(prtd->ram_channel);
508 prtd->ram_channel = -1;
513 static int davinci_pcm_dma_request(struct snd_pcm_substream *substream)
515 struct snd_dma_buffer *iram_dma;
516 struct davinci_runtime_data *prtd = substream->runtime->private_data;
517 struct davinci_pcm_dma_params *params = prtd->params;
523 /* Request asp master DMA channel */
524 ret = prtd->asp_channel = edma_alloc_channel(params->channel,
525 davinci_pcm_dma_irq, substream,
526 prtd->params->asp_chan_q);
530 /* Request asp link channels */
531 ret = prtd->asp_link[0] = edma_alloc_slot(
532 EDMA_CTLR(prtd->asp_channel), EDMA_SLOT_ANY);
536 iram_dma = (struct snd_dma_buffer *)substream->dma_buffer.private_data;
538 if (request_ping_pong(substream, prtd, iram_dma) == 0)
540 printk(KERN_WARNING "%s: dma channel allocation failed,"
541 "not using sram\n", __func__);
544 /* Issue transfer completion IRQ when the channel completes a
545 * transfer, then always reload from the same slot (by a kind
546 * of loopback link). The completion IRQ handler will update
547 * the reload slot with a new buffer.
549 * REVISIT save p_ram here after setting up everything except
550 * the buffer and its length (ccnt) ... use it as a template
551 * so davinci_pcm_enqueue_dma() takes less time in IRQ.
553 edma_read_slot(prtd->asp_link[0], &prtd->asp_params);
554 prtd->asp_params.opt |= TCINTEN |
555 EDMA_TCC(EDMA_CHAN_SLOT(prtd->asp_channel));
556 prtd->asp_params.link_bcntrld = EDMA_CHAN_SLOT(prtd->asp_link[0]) << 5;
557 edma_write_slot(prtd->asp_link[0], &prtd->asp_params);
560 edma_free_channel(prtd->asp_channel);
561 prtd->asp_channel = -1;
566 static int davinci_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
568 struct davinci_runtime_data *prtd = substream->runtime->private_data;
571 spin_lock(&prtd->lock);
574 case SNDRV_PCM_TRIGGER_START:
575 edma_start(prtd->asp_channel);
576 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
577 prtd->ram_channel >= 0) {
578 /* copy 1st iram buffer */
579 edma_start(prtd->ram_channel);
582 case SNDRV_PCM_TRIGGER_RESUME:
583 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
584 edma_resume(prtd->asp_channel);
586 case SNDRV_PCM_TRIGGER_STOP:
587 case SNDRV_PCM_TRIGGER_SUSPEND:
588 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
589 edma_pause(prtd->asp_channel);
596 spin_unlock(&prtd->lock);
601 static int davinci_pcm_prepare(struct snd_pcm_substream *substream)
603 struct davinci_runtime_data *prtd = substream->runtime->private_data;
605 davinci_pcm_period_reset(substream);
606 if (prtd->ram_channel >= 0) {
607 int ret = ping_pong_dma_setup(substream);
611 edma_write_slot(prtd->ram_channel, &prtd->ram_params);
612 edma_write_slot(prtd->asp_channel, &prtd->asp_params);
614 print_buf_info(prtd->ram_channel, "ram_channel");
615 print_buf_info(prtd->ram_link, "ram_link");
616 print_buf_info(prtd->ram_link2, "ram_link2");
617 print_buf_info(prtd->asp_channel, "asp_channel");
618 print_buf_info(prtd->asp_link[0], "asp_link[0]");
619 print_buf_info(prtd->asp_link[1], "asp_link[1]");
622 * There is a phase offset of 2 periods between the position
623 * used by dma setup and the position reported in the pointer
626 * The phase offset, when not using ping-pong buffers, is due to
627 * the two consecutive calls to davinci_pcm_enqueue_dma() below.
629 * Whereas here, with ping-pong buffers, the phase is due to
630 * there being an entire buffer transfer complete before the
631 * first dma completion event triggers davinci_pcm_dma_irq().
633 davinci_pcm_period_elapsed(substream);
634 davinci_pcm_period_elapsed(substream);
638 davinci_pcm_enqueue_dma(substream);
639 davinci_pcm_period_elapsed(substream);
641 /* Copy self-linked parameter RAM entry into master channel */
642 edma_read_slot(prtd->asp_link[0], &prtd->asp_params);
643 edma_write_slot(prtd->asp_channel, &prtd->asp_params);
644 davinci_pcm_enqueue_dma(substream);
645 davinci_pcm_period_elapsed(substream);
650 static snd_pcm_uframes_t
651 davinci_pcm_pointer(struct snd_pcm_substream *substream)
653 struct snd_pcm_runtime *runtime = substream->runtime;
654 struct davinci_runtime_data *prtd = runtime->private_data;
657 unsigned int period_size = snd_pcm_lib_period_bytes(substream);
660 * There is a phase offset of 2 periods between the position used by dma
661 * setup and the position reported in the pointer function. Either +2 in
662 * the dma setup or -2 here in the pointer function (with wrapping,
663 * both) accounts for this offset -- choose the latter since it makes
664 * the first-time setup clearer.
666 spin_lock(&prtd->lock);
667 asp_count = prtd->period - 2;
668 spin_unlock(&prtd->lock);
671 asp_count += runtime->periods;
672 asp_count *= period_size;
674 offset = bytes_to_frames(runtime, asp_count);
675 if (offset >= runtime->buffer_size)
681 static int davinci_pcm_open(struct snd_pcm_substream *substream)
683 struct snd_pcm_runtime *runtime = substream->runtime;
684 struct davinci_runtime_data *prtd;
685 struct snd_pcm_hardware *ppcm;
687 struct snd_soc_pcm_runtime *rtd = substream->private_data;
688 struct davinci_pcm_dma_params *pa;
689 struct davinci_pcm_dma_params *params;
691 pa = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
694 params = &pa[substream->stream];
696 ppcm = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
697 &pcm_hardware_playback : &pcm_hardware_capture;
698 allocate_sram(substream, params->sram_pool, params->sram_size, ppcm);
699 snd_soc_set_runtime_hwparams(substream, ppcm);
700 /* ensure that buffer size is a multiple of period size */
701 ret = snd_pcm_hw_constraint_integer(runtime,
702 SNDRV_PCM_HW_PARAM_PERIODS);
706 prtd = kzalloc(sizeof(struct davinci_runtime_data), GFP_KERNEL);
710 spin_lock_init(&prtd->lock);
711 prtd->params = params;
712 prtd->asp_channel = -1;
713 prtd->asp_link[0] = prtd->asp_link[1] = -1;
714 prtd->ram_channel = -1;
716 prtd->ram_link2 = -1;
718 runtime->private_data = prtd;
720 ret = davinci_pcm_dma_request(substream);
722 printk(KERN_ERR "davinci_pcm: Failed to get dma channels\n");
729 static int davinci_pcm_close(struct snd_pcm_substream *substream)
731 struct snd_pcm_runtime *runtime = substream->runtime;
732 struct davinci_runtime_data *prtd = runtime->private_data;
734 if (prtd->ram_channel >= 0)
735 edma_stop(prtd->ram_channel);
736 if (prtd->asp_channel >= 0)
737 edma_stop(prtd->asp_channel);
738 if (prtd->asp_link[0] >= 0)
739 edma_unlink(prtd->asp_link[0]);
740 if (prtd->asp_link[1] >= 0)
741 edma_unlink(prtd->asp_link[1]);
742 if (prtd->ram_link >= 0)
743 edma_unlink(prtd->ram_link);
745 if (prtd->asp_link[0] >= 0)
746 edma_free_slot(prtd->asp_link[0]);
747 if (prtd->asp_link[1] >= 0)
748 edma_free_slot(prtd->asp_link[1]);
749 if (prtd->asp_channel >= 0)
750 edma_free_channel(prtd->asp_channel);
751 if (prtd->ram_link >= 0)
752 edma_free_slot(prtd->ram_link);
753 if (prtd->ram_link2 >= 0)
754 edma_free_slot(prtd->ram_link2);
755 if (prtd->ram_channel >= 0)
756 edma_free_channel(prtd->ram_channel);
763 static int davinci_pcm_hw_params(struct snd_pcm_substream *substream,
764 struct snd_pcm_hw_params *hw_params)
766 return snd_pcm_lib_malloc_pages(substream,
767 params_buffer_bytes(hw_params));
770 static int davinci_pcm_hw_free(struct snd_pcm_substream *substream)
772 return snd_pcm_lib_free_pages(substream);
775 static int davinci_pcm_mmap(struct snd_pcm_substream *substream,
776 struct vm_area_struct *vma)
778 struct snd_pcm_runtime *runtime = substream->runtime;
780 return dma_mmap_writecombine(substream->pcm->card->dev, vma,
786 static struct snd_pcm_ops davinci_pcm_ops = {
787 .open = davinci_pcm_open,
788 .close = davinci_pcm_close,
789 .ioctl = snd_pcm_lib_ioctl,
790 .hw_params = davinci_pcm_hw_params,
791 .hw_free = davinci_pcm_hw_free,
792 .prepare = davinci_pcm_prepare,
793 .trigger = davinci_pcm_trigger,
794 .pointer = davinci_pcm_pointer,
795 .mmap = davinci_pcm_mmap,
798 static int davinci_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream,
801 struct snd_pcm_substream *substream = pcm->streams[stream].substream;
802 struct snd_dma_buffer *buf = &substream->dma_buffer;
804 buf->dev.type = SNDRV_DMA_TYPE_DEV;
805 buf->dev.dev = pcm->card->dev;
806 buf->private_data = NULL;
807 buf->area = dma_alloc_writecombine(pcm->card->dev, size,
808 &buf->addr, GFP_KERNEL);
810 pr_debug("davinci_pcm: preallocate_dma_buffer: area=%p, addr=%p, "
811 "size=%d\n", (void *) buf->area, (void *) buf->addr, size);
820 static void davinci_pcm_free(struct snd_pcm *pcm)
822 struct snd_pcm_substream *substream;
823 struct snd_dma_buffer *buf;
826 for (stream = 0; stream < 2; stream++) {
827 struct snd_dma_buffer *iram_dma;
828 substream = pcm->streams[stream].substream;
832 buf = &substream->dma_buffer;
836 dma_free_writecombine(pcm->card->dev, buf->bytes,
837 buf->area, buf->addr);
839 iram_dma = buf->private_data;
841 davinci_free_sram(substream, iram_dma);
847 static int davinci_pcm_new(struct snd_soc_pcm_runtime *rtd)
849 struct snd_card *card = rtd->card->snd_card;
850 struct snd_pcm *pcm = rtd->pcm;
853 ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
857 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
858 ret = davinci_pcm_preallocate_dma_buffer(pcm,
859 SNDRV_PCM_STREAM_PLAYBACK,
860 pcm_hardware_playback.buffer_bytes_max);
865 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
866 ret = davinci_pcm_preallocate_dma_buffer(pcm,
867 SNDRV_PCM_STREAM_CAPTURE,
868 pcm_hardware_capture.buffer_bytes_max);
876 static struct snd_soc_platform_driver davinci_soc_platform = {
877 .ops = &davinci_pcm_ops,
878 .pcm_new = davinci_pcm_new,
879 .pcm_free = davinci_pcm_free,
882 int davinci_soc_platform_register(struct device *dev)
884 return snd_soc_register_platform(dev, &davinci_soc_platform);
886 EXPORT_SYMBOL_GPL(davinci_soc_platform_register);
888 void davinci_soc_platform_unregister(struct device *dev)
890 snd_soc_unregister_platform(dev);
892 EXPORT_SYMBOL_GPL(davinci_soc_platform_unregister);
894 MODULE_AUTHOR("Vladimir Barinov");
895 MODULE_DESCRIPTION("TI DAVINCI PCM DMA module");
896 MODULE_LICENSE("GPL");