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>
20 #include <sound/core.h>
21 #include <sound/pcm.h>
22 #include <sound/pcm_params.h>
23 #include <sound/soc.h>
26 #include <mach/edma.h>
27 #include <mach/sram.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 static struct snd_pcm_hardware pcm_hardware_playback = {
50 .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
51 SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
52 SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME),
53 .formats = (SNDRV_PCM_FMTBIT_S16_LE),
54 .rates = (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 |
55 SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 |
56 SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 |
57 SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000 |
63 .buffer_bytes_max = 128 * 1024,
64 .period_bytes_min = 32,
65 .period_bytes_max = 8 * 1024,
71 static struct snd_pcm_hardware pcm_hardware_capture = {
72 .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
73 SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
74 SNDRV_PCM_INFO_PAUSE),
75 .formats = (SNDRV_PCM_FMTBIT_S16_LE),
76 .rates = (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 |
77 SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 |
78 SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 |
79 SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000 |
85 .buffer_bytes_max = 128 * 1024,
86 .period_bytes_min = 32,
87 .period_bytes_max = 8 * 1024,
94 * How ping/pong works....
97 * ram_params - copys 2*ping_size from start of SDRAM to iram,
99 * ram_link2 - copys rest of SDRAM to iram in ping_size units,
101 * ram_link - copys entire SDRAM to iram in ping_size uints,
104 * asp_params - same as asp_link[0]
105 * asp_link[0] - copys from lower half of iram to asp port
106 * links to asp_link[1], triggers iram copy event on completion
107 * asp_link[1] - copys from upper half of iram to asp port
108 * links to asp_link[0], triggers iram copy event on completion
109 * triggers interrupt only needed to let upper SOC levels update position
110 * in stream on completion
112 * When playback is started:
117 * ram_params - same as ram_link,
119 * ram_link - same as playback
122 * asp_params - same as playback
123 * asp_link[0] - same as playback
124 * asp_link[1] - same as playback
126 * When capture is started:
129 struct davinci_runtime_data {
131 int period; /* current DMA period */
132 int asp_channel; /* Master DMA channel */
133 int asp_link[2]; /* asp parameter link channel, ping/pong */
134 struct davinci_pcm_dma_params *params; /* DMA params */
138 struct edmacc_param asp_params;
139 struct edmacc_param ram_params;
143 * Not used with ping/pong
145 static void davinci_pcm_enqueue_dma(struct snd_pcm_substream *substream)
147 struct davinci_runtime_data *prtd = substream->runtime->private_data;
148 struct snd_pcm_runtime *runtime = substream->runtime;
149 int link = prtd->asp_link[0];
150 unsigned int period_size;
151 unsigned int dma_offset;
154 unsigned short src_bidx, dst_bidx;
155 unsigned short src_cidx, dst_cidx;
156 unsigned int data_type;
159 unsigned int fifo_level;
161 period_size = snd_pcm_lib_period_bytes(substream);
162 dma_offset = prtd->period * period_size;
163 dma_pos = runtime->dma_addr + dma_offset;
164 fifo_level = prtd->params->fifo_level;
166 pr_debug("davinci_pcm: audio_set_dma_params_play channel = %d "
167 "dma_ptr = %x period_size=%x\n", link, dma_pos, period_size);
169 data_type = prtd->params->data_type;
170 count = period_size / data_type;
174 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
176 dst = prtd->params->dma_addr;
177 src_bidx = data_type;
179 src_cidx = data_type * fifo_level;
182 src = prtd->params->dma_addr;
185 dst_bidx = data_type;
187 dst_cidx = data_type * fifo_level;
190 acnt = prtd->params->acnt;
191 edma_set_src(link, src, INCR, W8BIT);
192 edma_set_dest(link, dst, INCR, W8BIT);
194 edma_set_src_index(link, src_bidx, src_cidx);
195 edma_set_dest_index(link, dst_bidx, dst_cidx);
198 edma_set_transfer_params(link, acnt, count, 1, 0, ASYNC);
200 edma_set_transfer_params(link, acnt, fifo_level, count,
204 if (unlikely(prtd->period >= runtime->periods))
208 static void davinci_pcm_dma_irq(unsigned link, u16 ch_status, void *data)
210 struct snd_pcm_substream *substream = data;
211 struct davinci_runtime_data *prtd = substream->runtime->private_data;
213 print_buf_info(prtd->ram_channel, "i ram_channel");
214 pr_debug("davinci_pcm: link=%d, status=0x%x\n", link, ch_status);
216 if (unlikely(ch_status != DMA_COMPLETE))
219 if (snd_pcm_running(substream)) {
220 if (prtd->ram_channel < 0) {
221 /* No ping/pong must fix up link dma data*/
222 spin_lock(&prtd->lock);
223 davinci_pcm_enqueue_dma(substream);
224 spin_unlock(&prtd->lock);
226 snd_pcm_period_elapsed(substream);
230 static int allocate_sram(struct snd_pcm_substream *substream, unsigned size,
231 struct snd_pcm_hardware *ppcm)
233 struct snd_dma_buffer *buf = &substream->dma_buffer;
234 struct snd_dma_buffer *iram_dma = NULL;
235 dma_addr_t iram_phys = 0;
236 void *iram_virt = NULL;
238 if (buf->private_data || !size)
241 ppcm->period_bytes_max = size;
242 iram_virt = sram_alloc(size, &iram_phys);
245 iram_dma = kzalloc(sizeof(*iram_dma), GFP_KERNEL);
248 iram_dma->area = iram_virt;
249 iram_dma->addr = iram_phys;
250 memset(iram_dma->area, 0, size);
251 iram_dma->bytes = size;
252 buf->private_data = iram_dma;
256 sram_free(iram_virt, size);
262 * Only used with ping/pong.
263 * This is called after runtime->dma_addr, period_bytes and data_type are valid
265 static int ping_pong_dma_setup(struct snd_pcm_substream *substream)
267 unsigned short ram_src_cidx, ram_dst_cidx;
268 struct snd_pcm_runtime *runtime = substream->runtime;
269 struct davinci_runtime_data *prtd = runtime->private_data;
270 struct snd_dma_buffer *iram_dma =
271 (struct snd_dma_buffer *)substream->dma_buffer.private_data;
272 struct davinci_pcm_dma_params *params = prtd->params;
273 unsigned int data_type = params->data_type;
274 unsigned int acnt = params->acnt;
275 /* divide by 2 for ping/pong */
276 unsigned int ping_size = snd_pcm_lib_period_bytes(substream) >> 1;
277 int link = prtd->asp_link[1];
278 unsigned int fifo_level = prtd->params->fifo_level;
280 if ((data_type == 0) || (data_type > 4)) {
281 printk(KERN_ERR "%s: data_type=%i\n", __func__, data_type);
284 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
285 dma_addr_t asp_src_pong = iram_dma->addr + ping_size;
286 ram_src_cidx = ping_size;
287 ram_dst_cidx = -ping_size;
288 edma_set_src(link, asp_src_pong, INCR, W8BIT);
290 link = prtd->asp_link[0];
291 edma_set_src_index(link, data_type, data_type * fifo_level);
292 link = prtd->asp_link[1];
293 edma_set_src_index(link, data_type, data_type * fifo_level);
295 link = prtd->ram_link;
296 edma_set_src(link, runtime->dma_addr, INCR, W32BIT);
298 dma_addr_t asp_dst_pong = iram_dma->addr + ping_size;
299 ram_src_cidx = -ping_size;
300 ram_dst_cidx = ping_size;
301 edma_set_dest(link, asp_dst_pong, INCR, W8BIT);
303 link = prtd->asp_link[0];
304 edma_set_dest_index(link, data_type, data_type * fifo_level);
305 link = prtd->asp_link[1];
306 edma_set_dest_index(link, data_type, data_type * fifo_level);
308 link = prtd->ram_link;
309 edma_set_dest(link, runtime->dma_addr, INCR, W32BIT);
313 count = ping_size / data_type;
314 edma_set_transfer_params(prtd->asp_link[0], acnt, count,
316 edma_set_transfer_params(prtd->asp_link[1], acnt, count,
319 count = ping_size / (data_type * fifo_level);
320 edma_set_transfer_params(prtd->asp_link[0], acnt, fifo_level,
321 count, fifo_level, ABSYNC);
322 edma_set_transfer_params(prtd->asp_link[1], acnt, fifo_level,
323 count, fifo_level, ABSYNC);
326 link = prtd->ram_link;
327 edma_set_src_index(link, ping_size, ram_src_cidx);
328 edma_set_dest_index(link, ping_size, ram_dst_cidx);
329 edma_set_transfer_params(link, ping_size, 2,
330 runtime->periods, 2, ASYNC);
332 /* init master params */
333 edma_read_slot(prtd->asp_link[0], &prtd->asp_params);
334 edma_read_slot(prtd->ram_link, &prtd->ram_params);
335 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
336 struct edmacc_param p_ram;
337 /* Copy entire iram buffer before playback started */
338 prtd->ram_params.a_b_cnt = (1 << 16) | (ping_size << 1);
340 prtd->ram_params.src_dst_bidx = (ping_size << 1);
342 prtd->ram_params.src_dst_cidx = (ping_size << 1);
343 prtd->ram_params.ccnt = 1;
345 /* Skip 1st period */
346 edma_read_slot(prtd->ram_link, &p_ram);
347 p_ram.src += (ping_size << 1);
349 edma_write_slot(prtd->ram_link2, &p_ram);
351 * When 1st started, ram -> iram dma channel will fill the
352 * entire iram. Then, whenever a ping/pong asp buffer finishes,
353 * 1/2 iram will be filled.
355 prtd->ram_params.link_bcntrld =
356 EDMA_CHAN_SLOT(prtd->ram_link2) << 5;
361 /* 1 asp tx or rx channel using 2 parameter channels
362 * 1 ram to/from iram channel using 1 parameter channel
365 * ram copy channel kicks off first,
366 * 1st ram copy of entire iram buffer completion kicks off asp channel
367 * asp tcc always kicks off ram copy of 1/2 iram buffer
370 * asp channel starts, tcc kicks off ram copy
372 static int request_ping_pong(struct snd_pcm_substream *substream,
373 struct davinci_runtime_data *prtd,
374 struct snd_dma_buffer *iram_dma)
376 dma_addr_t asp_src_ping;
377 dma_addr_t asp_dst_ping;
379 struct davinci_pcm_dma_params *params = prtd->params;
381 /* Request ram master channel */
382 link = prtd->ram_channel = edma_alloc_channel(EDMA_CHANNEL_ANY,
383 davinci_pcm_dma_irq, substream,
388 /* Request ram link channel */
389 link = prtd->ram_link = edma_alloc_slot(
390 EDMA_CTLR(prtd->ram_channel), EDMA_SLOT_ANY);
394 link = prtd->asp_link[1] = edma_alloc_slot(
395 EDMA_CTLR(prtd->asp_channel), EDMA_SLOT_ANY);
399 prtd->ram_link2 = -1;
400 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
401 link = prtd->ram_link2 = edma_alloc_slot(
402 EDMA_CTLR(prtd->ram_channel), EDMA_SLOT_ANY);
406 /* circle ping-pong buffers */
407 edma_link(prtd->asp_link[0], prtd->asp_link[1]);
408 edma_link(prtd->asp_link[1], prtd->asp_link[0]);
409 /* circle ram buffers */
410 edma_link(prtd->ram_link, prtd->ram_link);
412 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
413 asp_src_ping = iram_dma->addr;
414 asp_dst_ping = params->dma_addr; /* fifo */
416 asp_src_ping = params->dma_addr; /* fifo */
417 asp_dst_ping = iram_dma->addr;
420 link = prtd->asp_link[0];
421 edma_set_src(link, asp_src_ping, INCR, W16BIT);
422 edma_set_dest(link, asp_dst_ping, INCR, W16BIT);
423 edma_set_src_index(link, 0, 0);
424 edma_set_dest_index(link, 0, 0);
426 edma_read_slot(link, &prtd->asp_params);
427 prtd->asp_params.opt &= ~(TCCMODE | EDMA_TCC(0x3f) | TCINTEN);
428 prtd->asp_params.opt |= TCCHEN | EDMA_TCC(prtd->ram_channel & 0x3f);
429 edma_write_slot(link, &prtd->asp_params);
432 link = prtd->asp_link[1];
433 edma_set_src(link, asp_src_ping, INCR, W16BIT);
434 edma_set_dest(link, asp_dst_ping, INCR, W16BIT);
435 edma_set_src_index(link, 0, 0);
436 edma_set_dest_index(link, 0, 0);
438 edma_read_slot(link, &prtd->asp_params);
439 prtd->asp_params.opt &= ~(TCCMODE | EDMA_TCC(0x3f));
440 /* interrupt after every pong completion */
441 prtd->asp_params.opt |= TCINTEN | TCCHEN |
442 EDMA_TCC(EDMA_CHAN_SLOT(prtd->ram_channel));
443 edma_write_slot(link, &prtd->asp_params);
446 link = prtd->ram_link;
447 edma_set_src(link, iram_dma->addr, INCR, W32BIT);
448 edma_set_dest(link, iram_dma->addr, INCR, W32BIT);
449 pr_debug("%s: audio dma channels/slots in use for ram:%u %u %u,"
450 "for asp:%u %u %u\n", __func__,
451 prtd->ram_channel, prtd->ram_link, prtd->ram_link2,
452 prtd->asp_channel, prtd->asp_link[0],
456 edma_free_channel(prtd->asp_link[1]);
457 prtd->asp_link[1] = -1;
459 edma_free_channel(prtd->ram_link);
462 edma_free_channel(prtd->ram_channel);
463 prtd->ram_channel = -1;
468 static int davinci_pcm_dma_request(struct snd_pcm_substream *substream)
470 struct snd_dma_buffer *iram_dma;
471 struct davinci_runtime_data *prtd = substream->runtime->private_data;
472 struct davinci_pcm_dma_params *params = prtd->params;
478 /* Request asp master DMA channel */
479 link = prtd->asp_channel = edma_alloc_channel(params->channel,
480 davinci_pcm_dma_irq, substream, EVENTQ_0);
484 /* Request asp link channels */
485 link = prtd->asp_link[0] = edma_alloc_slot(
486 EDMA_CTLR(prtd->asp_channel), EDMA_SLOT_ANY);
490 iram_dma = (struct snd_dma_buffer *)substream->dma_buffer.private_data;
492 if (request_ping_pong(substream, prtd, iram_dma) == 0)
494 printk(KERN_WARNING "%s: dma channel allocation failed,"
495 "not using sram\n", __func__);
498 /* Issue transfer completion IRQ when the channel completes a
499 * transfer, then always reload from the same slot (by a kind
500 * of loopback link). The completion IRQ handler will update
501 * the reload slot with a new buffer.
503 * REVISIT save p_ram here after setting up everything except
504 * the buffer and its length (ccnt) ... use it as a template
505 * so davinci_pcm_enqueue_dma() takes less time in IRQ.
507 edma_read_slot(link, &prtd->asp_params);
508 prtd->asp_params.opt |= TCINTEN |
509 EDMA_TCC(EDMA_CHAN_SLOT(prtd->asp_channel));
510 prtd->asp_params.link_bcntrld = EDMA_CHAN_SLOT(link) << 5;
511 edma_write_slot(link, &prtd->asp_params);
514 edma_free_channel(prtd->asp_channel);
515 prtd->asp_channel = -1;
520 static int davinci_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
522 struct davinci_runtime_data *prtd = substream->runtime->private_data;
525 spin_lock(&prtd->lock);
528 case SNDRV_PCM_TRIGGER_START:
529 case SNDRV_PCM_TRIGGER_RESUME:
530 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
531 edma_resume(prtd->asp_channel);
533 case SNDRV_PCM_TRIGGER_STOP:
534 case SNDRV_PCM_TRIGGER_SUSPEND:
535 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
536 edma_pause(prtd->asp_channel);
543 spin_unlock(&prtd->lock);
548 static int davinci_pcm_prepare(struct snd_pcm_substream *substream)
550 struct davinci_runtime_data *prtd = substream->runtime->private_data;
552 if (prtd->ram_channel >= 0) {
553 int ret = ping_pong_dma_setup(substream);
557 edma_write_slot(prtd->ram_channel, &prtd->ram_params);
558 edma_write_slot(prtd->asp_channel, &prtd->asp_params);
560 print_buf_info(prtd->ram_channel, "ram_channel");
561 print_buf_info(prtd->ram_link, "ram_link");
562 print_buf_info(prtd->ram_link2, "ram_link2");
563 print_buf_info(prtd->asp_channel, "asp_channel");
564 print_buf_info(prtd->asp_link[0], "asp_link[0]");
565 print_buf_info(prtd->asp_link[1], "asp_link[1]");
567 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
568 /* copy 1st iram buffer */
569 edma_start(prtd->ram_channel);
571 edma_start(prtd->asp_channel);
575 davinci_pcm_enqueue_dma(substream);
577 /* Copy self-linked parameter RAM entry into master channel */
578 edma_read_slot(prtd->asp_link[0], &prtd->asp_params);
579 edma_write_slot(prtd->asp_channel, &prtd->asp_params);
580 davinci_pcm_enqueue_dma(substream);
581 edma_start(prtd->asp_channel);
586 static snd_pcm_uframes_t
587 davinci_pcm_pointer(struct snd_pcm_substream *substream)
589 struct snd_pcm_runtime *runtime = substream->runtime;
590 struct davinci_runtime_data *prtd = runtime->private_data;
593 dma_addr_t asp_src, asp_dst;
595 spin_lock(&prtd->lock);
596 if (prtd->ram_channel >= 0) {
599 dma_addr_t ram_src, ram_dst;
600 unsigned int period_size = snd_pcm_lib_period_bytes(substream);
601 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
602 /* reading ram before asp should be safe
603 * as long as the asp transfers less than a ping size
604 * of bytes between the 2 reads
606 edma_get_position(prtd->ram_channel,
608 edma_get_position(prtd->asp_channel,
610 asp_count = asp_src - prtd->asp_params.src;
611 ram_count = ram_src - prtd->ram_params.src;
612 mod_ram = ram_count % period_size;
613 mod_ram -= asp_count;
615 mod_ram += period_size;
616 else if (mod_ram == 0) {
617 if (snd_pcm_running(substream))
618 mod_ram += period_size;
620 ram_count -= mod_ram;
622 ram_count += period_size * runtime->periods;
624 edma_get_position(prtd->ram_channel,
626 ram_count = ram_dst - prtd->ram_params.dst;
628 asp_count = ram_count;
630 edma_get_position(prtd->asp_channel, &asp_src, &asp_dst);
631 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
632 asp_count = asp_src - runtime->dma_addr;
634 asp_count = asp_dst - runtime->dma_addr;
636 spin_unlock(&prtd->lock);
638 offset = bytes_to_frames(runtime, asp_count);
639 if (offset >= runtime->buffer_size)
645 static int davinci_pcm_open(struct snd_pcm_substream *substream)
647 struct snd_pcm_runtime *runtime = substream->runtime;
648 struct davinci_runtime_data *prtd;
649 struct snd_pcm_hardware *ppcm;
651 struct snd_soc_pcm_runtime *rtd = substream->private_data;
652 struct davinci_pcm_dma_params *pa = rtd->dai->cpu_dai->dma_data;
653 struct davinci_pcm_dma_params *params;
656 params = &pa[substream->stream];
658 ppcm = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
659 &pcm_hardware_playback : &pcm_hardware_capture;
660 allocate_sram(substream, params->sram_size, ppcm);
661 snd_soc_set_runtime_hwparams(substream, ppcm);
662 /* ensure that buffer size is a multiple of period size */
663 ret = snd_pcm_hw_constraint_integer(runtime,
664 SNDRV_PCM_HW_PARAM_PERIODS);
668 prtd = kzalloc(sizeof(struct davinci_runtime_data), GFP_KERNEL);
672 spin_lock_init(&prtd->lock);
673 prtd->params = params;
674 prtd->asp_channel = -1;
675 prtd->asp_link[0] = prtd->asp_link[1] = -1;
676 prtd->ram_channel = -1;
678 prtd->ram_link2 = -1;
680 runtime->private_data = prtd;
682 ret = davinci_pcm_dma_request(substream);
684 printk(KERN_ERR "davinci_pcm: Failed to get dma channels\n");
691 static int davinci_pcm_close(struct snd_pcm_substream *substream)
693 struct snd_pcm_runtime *runtime = substream->runtime;
694 struct davinci_runtime_data *prtd = runtime->private_data;
696 if (prtd->ram_channel >= 0)
697 edma_stop(prtd->ram_channel);
698 if (prtd->asp_channel >= 0)
699 edma_stop(prtd->asp_channel);
700 if (prtd->asp_link[0] >= 0)
701 edma_unlink(prtd->asp_link[0]);
702 if (prtd->asp_link[1] >= 0)
703 edma_unlink(prtd->asp_link[1]);
704 if (prtd->ram_link >= 0)
705 edma_unlink(prtd->ram_link);
707 if (prtd->asp_link[0] >= 0)
708 edma_free_slot(prtd->asp_link[0]);
709 if (prtd->asp_link[1] >= 0)
710 edma_free_slot(prtd->asp_link[1]);
711 if (prtd->asp_channel >= 0)
712 edma_free_channel(prtd->asp_channel);
713 if (prtd->ram_link >= 0)
714 edma_free_slot(prtd->ram_link);
715 if (prtd->ram_link2 >= 0)
716 edma_free_slot(prtd->ram_link2);
717 if (prtd->ram_channel >= 0)
718 edma_free_channel(prtd->ram_channel);
725 static int davinci_pcm_hw_params(struct snd_pcm_substream *substream,
726 struct snd_pcm_hw_params *hw_params)
728 return snd_pcm_lib_malloc_pages(substream,
729 params_buffer_bytes(hw_params));
732 static int davinci_pcm_hw_free(struct snd_pcm_substream *substream)
734 return snd_pcm_lib_free_pages(substream);
737 static int davinci_pcm_mmap(struct snd_pcm_substream *substream,
738 struct vm_area_struct *vma)
740 struct snd_pcm_runtime *runtime = substream->runtime;
742 return dma_mmap_writecombine(substream->pcm->card->dev, vma,
748 static struct snd_pcm_ops davinci_pcm_ops = {
749 .open = davinci_pcm_open,
750 .close = davinci_pcm_close,
751 .ioctl = snd_pcm_lib_ioctl,
752 .hw_params = davinci_pcm_hw_params,
753 .hw_free = davinci_pcm_hw_free,
754 .prepare = davinci_pcm_prepare,
755 .trigger = davinci_pcm_trigger,
756 .pointer = davinci_pcm_pointer,
757 .mmap = davinci_pcm_mmap,
760 static int davinci_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream,
763 struct snd_pcm_substream *substream = pcm->streams[stream].substream;
764 struct snd_dma_buffer *buf = &substream->dma_buffer;
766 buf->dev.type = SNDRV_DMA_TYPE_DEV;
767 buf->dev.dev = pcm->card->dev;
768 buf->private_data = NULL;
769 buf->area = dma_alloc_writecombine(pcm->card->dev, size,
770 &buf->addr, GFP_KERNEL);
772 pr_debug("davinci_pcm: preallocate_dma_buffer: area=%p, addr=%p, "
773 "size=%d\n", (void *) buf->area, (void *) buf->addr, size);
782 static void davinci_pcm_free(struct snd_pcm *pcm)
784 struct snd_pcm_substream *substream;
785 struct snd_dma_buffer *buf;
788 for (stream = 0; stream < 2; stream++) {
789 struct snd_dma_buffer *iram_dma;
790 substream = pcm->streams[stream].substream;
794 buf = &substream->dma_buffer;
798 dma_free_writecombine(pcm->card->dev, buf->bytes,
799 buf->area, buf->addr);
801 iram_dma = (struct snd_dma_buffer *)buf->private_data;
803 sram_free(iram_dma->area, iram_dma->bytes);
809 static u64 davinci_pcm_dmamask = 0xffffffff;
811 static int davinci_pcm_new(struct snd_card *card,
812 struct snd_soc_dai *dai, struct snd_pcm *pcm)
816 if (!card->dev->dma_mask)
817 card->dev->dma_mask = &davinci_pcm_dmamask;
818 if (!card->dev->coherent_dma_mask)
819 card->dev->coherent_dma_mask = 0xffffffff;
821 if (dai->playback.channels_min) {
822 ret = davinci_pcm_preallocate_dma_buffer(pcm,
823 SNDRV_PCM_STREAM_PLAYBACK,
824 pcm_hardware_playback.buffer_bytes_max);
829 if (dai->capture.channels_min) {
830 ret = davinci_pcm_preallocate_dma_buffer(pcm,
831 SNDRV_PCM_STREAM_CAPTURE,
832 pcm_hardware_capture.buffer_bytes_max);
840 struct snd_soc_platform davinci_soc_platform = {
841 .name = "davinci-audio",
842 .pcm_ops = &davinci_pcm_ops,
843 .pcm_new = davinci_pcm_new,
844 .pcm_free = davinci_pcm_free,
846 EXPORT_SYMBOL_GPL(davinci_soc_platform);
848 static int __init davinci_soc_platform_init(void)
850 return snd_soc_register_platform(&davinci_soc_platform);
852 module_init(davinci_soc_platform_init);
854 static void __exit davinci_soc_platform_exit(void)
856 snd_soc_unregister_platform(&davinci_soc_platform);
858 module_exit(davinci_soc_platform_exit);
860 MODULE_AUTHOR("Vladimir Barinov");
861 MODULE_DESCRIPTION("TI DAVINCI PCM DMA module");
862 MODULE_LICENSE("GPL");