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 #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 | SNDRV_PCM_RATE_16000 |
72 SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 |
73 SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 |
74 SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000 |
80 .buffer_bytes_max = 128 * 1024,
81 .period_bytes_min = 32,
82 .period_bytes_max = 8 * 1024,
88 static struct snd_pcm_hardware pcm_hardware_capture = {
89 .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
90 SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
91 SNDRV_PCM_INFO_PAUSE |
92 SNDRV_PCM_INFO_BATCH),
93 .formats = DAVINCI_PCM_FMTBITS,
94 .rates = (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 |
95 SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 |
96 SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 |
97 SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000 |
103 .buffer_bytes_max = 128 * 1024,
104 .period_bytes_min = 32,
105 .period_bytes_max = 8 * 1024,
112 * How ping/pong works....
115 * ram_params - copys 2*ping_size from start of SDRAM to iram,
117 * ram_link2 - copys rest of SDRAM to iram in ping_size units,
119 * ram_link - copys entire SDRAM to iram in ping_size uints,
122 * asp_params - same as asp_link[0]
123 * asp_link[0] - copys from lower half of iram to asp port
124 * links to asp_link[1], triggers iram copy event on completion
125 * asp_link[1] - copys from upper half of iram to asp port
126 * links to asp_link[0], triggers iram copy event on completion
127 * triggers interrupt only needed to let upper SOC levels update position
128 * in stream on completion
130 * When playback is started:
135 * ram_params - same as ram_link,
137 * ram_link - same as playback
140 * asp_params - same as playback
141 * asp_link[0] - same as playback
142 * asp_link[1] - same as playback
144 * When capture is started:
147 struct davinci_runtime_data {
149 int period; /* current DMA period */
150 int asp_channel; /* Master DMA channel */
151 int asp_link[2]; /* asp parameter link channel, ping/pong */
152 struct davinci_pcm_dma_params *params; /* DMA params */
156 struct edmacc_param asp_params;
157 struct edmacc_param ram_params;
160 static void davinci_pcm_period_elapsed(struct snd_pcm_substream *substream)
162 struct davinci_runtime_data *prtd = substream->runtime->private_data;
163 struct snd_pcm_runtime *runtime = substream->runtime;
166 if (unlikely(prtd->period >= runtime->periods))
170 static void davinci_pcm_period_reset(struct snd_pcm_substream *substream)
172 struct davinci_runtime_data *prtd = substream->runtime->private_data;
177 * Not used with ping/pong
179 static void davinci_pcm_enqueue_dma(struct snd_pcm_substream *substream)
181 struct davinci_runtime_data *prtd = substream->runtime->private_data;
182 struct snd_pcm_runtime *runtime = substream->runtime;
183 unsigned int period_size;
184 unsigned int dma_offset;
187 unsigned short src_bidx, dst_bidx;
188 unsigned short src_cidx, dst_cidx;
189 unsigned int data_type;
192 unsigned int fifo_level;
194 period_size = snd_pcm_lib_period_bytes(substream);
195 dma_offset = prtd->period * period_size;
196 dma_pos = runtime->dma_addr + dma_offset;
197 fifo_level = prtd->params->fifo_level;
199 pr_debug("davinci_pcm: audio_set_dma_params_play channel = %d "
200 "dma_ptr = %x period_size=%x\n", prtd->asp_link[0], dma_pos,
203 data_type = prtd->params->data_type;
204 count = period_size / data_type;
208 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
210 dst = prtd->params->dma_addr;
211 src_bidx = data_type;
213 src_cidx = data_type * fifo_level;
216 src = prtd->params->dma_addr;
219 dst_bidx = data_type;
221 dst_cidx = data_type * fifo_level;
224 acnt = prtd->params->acnt;
225 edma_set_src(prtd->asp_link[0], src, INCR, W8BIT);
226 edma_set_dest(prtd->asp_link[0], dst, INCR, W8BIT);
228 edma_set_src_index(prtd->asp_link[0], src_bidx, src_cidx);
229 edma_set_dest_index(prtd->asp_link[0], dst_bidx, dst_cidx);
232 edma_set_transfer_params(prtd->asp_link[0], acnt, count, 1, 0,
235 edma_set_transfer_params(prtd->asp_link[0], acnt, fifo_level,
240 static void davinci_pcm_dma_irq(unsigned link, u16 ch_status, void *data)
242 struct snd_pcm_substream *substream = data;
243 struct davinci_runtime_data *prtd = substream->runtime->private_data;
245 print_buf_info(prtd->ram_channel, "i ram_channel");
246 pr_debug("davinci_pcm: link=%d, status=0x%x\n", link, ch_status);
248 if (unlikely(ch_status != DMA_COMPLETE))
251 if (snd_pcm_running(substream)) {
252 spin_lock(&prtd->lock);
253 if (prtd->ram_channel < 0) {
254 /* No ping/pong must fix up link dma data*/
255 davinci_pcm_enqueue_dma(substream);
257 davinci_pcm_period_elapsed(substream);
258 spin_unlock(&prtd->lock);
259 snd_pcm_period_elapsed(substream);
263 static int allocate_sram(struct snd_pcm_substream *substream, unsigned size,
264 struct snd_pcm_hardware *ppcm)
266 struct snd_dma_buffer *buf = &substream->dma_buffer;
267 struct snd_dma_buffer *iram_dma = NULL;
268 dma_addr_t iram_phys = 0;
269 void *iram_virt = NULL;
271 if (buf->private_data || !size)
274 ppcm->period_bytes_max = size;
275 iram_virt = sram_alloc(size, &iram_phys);
278 iram_dma = kzalloc(sizeof(*iram_dma), GFP_KERNEL);
281 iram_dma->area = iram_virt;
282 iram_dma->addr = iram_phys;
283 memset(iram_dma->area, 0, size);
284 iram_dma->bytes = size;
285 buf->private_data = iram_dma;
289 sram_free(iram_virt, size);
295 * Only used with ping/pong.
296 * This is called after runtime->dma_addr, period_bytes and data_type are valid
298 static int ping_pong_dma_setup(struct snd_pcm_substream *substream)
300 unsigned short ram_src_cidx, ram_dst_cidx;
301 struct snd_pcm_runtime *runtime = substream->runtime;
302 struct davinci_runtime_data *prtd = runtime->private_data;
303 struct snd_dma_buffer *iram_dma =
304 (struct snd_dma_buffer *)substream->dma_buffer.private_data;
305 struct davinci_pcm_dma_params *params = prtd->params;
306 unsigned int data_type = params->data_type;
307 unsigned int acnt = params->acnt;
308 /* divide by 2 for ping/pong */
309 unsigned int ping_size = snd_pcm_lib_period_bytes(substream) >> 1;
310 unsigned int fifo_level = prtd->params->fifo_level;
312 if ((data_type == 0) || (data_type > 4)) {
313 printk(KERN_ERR "%s: data_type=%i\n", __func__, data_type);
316 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
317 dma_addr_t asp_src_pong = iram_dma->addr + ping_size;
318 ram_src_cidx = ping_size;
319 ram_dst_cidx = -ping_size;
320 edma_set_src(prtd->asp_link[1], asp_src_pong, INCR, W8BIT);
322 edma_set_src_index(prtd->asp_link[0], data_type,
323 data_type * fifo_level);
324 edma_set_src_index(prtd->asp_link[1], data_type,
325 data_type * fifo_level);
327 edma_set_src(prtd->ram_link, runtime->dma_addr, INCR, W32BIT);
329 dma_addr_t asp_dst_pong = iram_dma->addr + ping_size;
330 ram_src_cidx = -ping_size;
331 ram_dst_cidx = ping_size;
332 edma_set_dest(prtd->asp_link[1], asp_dst_pong, INCR, W8BIT);
334 edma_set_dest_index(prtd->asp_link[0], data_type,
335 data_type * fifo_level);
336 edma_set_dest_index(prtd->asp_link[1], data_type,
337 data_type * fifo_level);
339 edma_set_dest(prtd->ram_link, runtime->dma_addr, INCR, W32BIT);
343 count = ping_size / data_type;
344 edma_set_transfer_params(prtd->asp_link[0], acnt, count,
346 edma_set_transfer_params(prtd->asp_link[1], acnt, count,
349 count = ping_size / (data_type * fifo_level);
350 edma_set_transfer_params(prtd->asp_link[0], acnt, fifo_level,
351 count, fifo_level, ABSYNC);
352 edma_set_transfer_params(prtd->asp_link[1], acnt, fifo_level,
353 count, fifo_level, ABSYNC);
356 edma_set_src_index(prtd->ram_link, ping_size, ram_src_cidx);
357 edma_set_dest_index(prtd->ram_link, ping_size, ram_dst_cidx);
358 edma_set_transfer_params(prtd->ram_link, ping_size, 2,
359 runtime->periods, 2, ASYNC);
361 /* init master params */
362 edma_read_slot(prtd->asp_link[0], &prtd->asp_params);
363 edma_read_slot(prtd->ram_link, &prtd->ram_params);
364 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
365 struct edmacc_param p_ram;
366 /* Copy entire iram buffer before playback started */
367 prtd->ram_params.a_b_cnt = (1 << 16) | (ping_size << 1);
369 prtd->ram_params.src_dst_bidx = (ping_size << 1);
371 prtd->ram_params.src_dst_cidx = (ping_size << 1);
372 prtd->ram_params.ccnt = 1;
374 /* Skip 1st period */
375 edma_read_slot(prtd->ram_link, &p_ram);
376 p_ram.src += (ping_size << 1);
378 edma_write_slot(prtd->ram_link2, &p_ram);
380 * When 1st started, ram -> iram dma channel will fill the
381 * entire iram. Then, whenever a ping/pong asp buffer finishes,
382 * 1/2 iram will be filled.
384 prtd->ram_params.link_bcntrld =
385 EDMA_CHAN_SLOT(prtd->ram_link2) << 5;
390 /* 1 asp tx or rx channel using 2 parameter channels
391 * 1 ram to/from iram channel using 1 parameter channel
394 * ram copy channel kicks off first,
395 * 1st ram copy of entire iram buffer completion kicks off asp channel
396 * asp tcc always kicks off ram copy of 1/2 iram buffer
399 * asp channel starts, tcc kicks off ram copy
401 static int request_ping_pong(struct snd_pcm_substream *substream,
402 struct davinci_runtime_data *prtd,
403 struct snd_dma_buffer *iram_dma)
405 dma_addr_t asp_src_ping;
406 dma_addr_t asp_dst_ping;
408 struct davinci_pcm_dma_params *params = prtd->params;
410 /* Request ram master channel */
411 ret = prtd->ram_channel = edma_alloc_channel(EDMA_CHANNEL_ANY,
412 davinci_pcm_dma_irq, substream,
413 prtd->params->ram_chan_q);
417 /* Request ram link channel */
418 ret = prtd->ram_link = edma_alloc_slot(
419 EDMA_CTLR(prtd->ram_channel), EDMA_SLOT_ANY);
423 ret = prtd->asp_link[1] = edma_alloc_slot(
424 EDMA_CTLR(prtd->asp_channel), EDMA_SLOT_ANY);
428 prtd->ram_link2 = -1;
429 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
430 ret = prtd->ram_link2 = edma_alloc_slot(
431 EDMA_CTLR(prtd->ram_channel), EDMA_SLOT_ANY);
435 /* circle ping-pong buffers */
436 edma_link(prtd->asp_link[0], prtd->asp_link[1]);
437 edma_link(prtd->asp_link[1], prtd->asp_link[0]);
438 /* circle ram buffers */
439 edma_link(prtd->ram_link, prtd->ram_link);
441 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
442 asp_src_ping = iram_dma->addr;
443 asp_dst_ping = params->dma_addr; /* fifo */
445 asp_src_ping = params->dma_addr; /* fifo */
446 asp_dst_ping = iram_dma->addr;
449 edma_set_src(prtd->asp_link[0], asp_src_ping, INCR, W16BIT);
450 edma_set_dest(prtd->asp_link[0], asp_dst_ping, INCR, W16BIT);
451 edma_set_src_index(prtd->asp_link[0], 0, 0);
452 edma_set_dest_index(prtd->asp_link[0], 0, 0);
454 edma_read_slot(prtd->asp_link[0], &prtd->asp_params);
455 prtd->asp_params.opt &= ~(TCCMODE | EDMA_TCC(0x3f) | TCINTEN);
456 prtd->asp_params.opt |= TCCHEN |
457 EDMA_TCC(prtd->ram_channel & 0x3f);
458 edma_write_slot(prtd->asp_link[0], &prtd->asp_params);
461 edma_set_src(prtd->asp_link[1], asp_src_ping, INCR, W16BIT);
462 edma_set_dest(prtd->asp_link[1], asp_dst_ping, INCR, W16BIT);
463 edma_set_src_index(prtd->asp_link[1], 0, 0);
464 edma_set_dest_index(prtd->asp_link[1], 0, 0);
466 edma_read_slot(prtd->asp_link[1], &prtd->asp_params);
467 prtd->asp_params.opt &= ~(TCCMODE | EDMA_TCC(0x3f));
468 /* interrupt after every pong completion */
469 prtd->asp_params.opt |= TCINTEN | TCCHEN |
470 EDMA_TCC(prtd->ram_channel & 0x3f);
471 edma_write_slot(prtd->asp_link[1], &prtd->asp_params);
474 edma_set_src(prtd->ram_link, iram_dma->addr, INCR, W32BIT);
475 edma_set_dest(prtd->ram_link, iram_dma->addr, INCR, W32BIT);
476 pr_debug("%s: audio dma channels/slots in use for ram:%u %u %u,"
477 "for asp:%u %u %u\n", __func__,
478 prtd->ram_channel, prtd->ram_link, prtd->ram_link2,
479 prtd->asp_channel, prtd->asp_link[0],
483 edma_free_channel(prtd->asp_link[1]);
484 prtd->asp_link[1] = -1;
486 edma_free_channel(prtd->ram_link);
489 edma_free_channel(prtd->ram_channel);
490 prtd->ram_channel = -1;
495 static int davinci_pcm_dma_request(struct snd_pcm_substream *substream)
497 struct snd_dma_buffer *iram_dma;
498 struct davinci_runtime_data *prtd = substream->runtime->private_data;
499 struct davinci_pcm_dma_params *params = prtd->params;
505 /* Request asp master DMA channel */
506 ret = prtd->asp_channel = edma_alloc_channel(params->channel,
507 davinci_pcm_dma_irq, substream,
508 prtd->params->asp_chan_q);
512 /* Request asp link channels */
513 ret = prtd->asp_link[0] = edma_alloc_slot(
514 EDMA_CTLR(prtd->asp_channel), EDMA_SLOT_ANY);
518 iram_dma = (struct snd_dma_buffer *)substream->dma_buffer.private_data;
520 if (request_ping_pong(substream, prtd, iram_dma) == 0)
522 printk(KERN_WARNING "%s: dma channel allocation failed,"
523 "not using sram\n", __func__);
526 /* Issue transfer completion IRQ when the channel completes a
527 * transfer, then always reload from the same slot (by a kind
528 * of loopback link). The completion IRQ handler will update
529 * the reload slot with a new buffer.
531 * REVISIT save p_ram here after setting up everything except
532 * the buffer and its length (ccnt) ... use it as a template
533 * so davinci_pcm_enqueue_dma() takes less time in IRQ.
535 edma_read_slot(prtd->asp_link[0], &prtd->asp_params);
536 prtd->asp_params.opt |= TCINTEN |
537 EDMA_TCC(EDMA_CHAN_SLOT(prtd->asp_channel));
538 prtd->asp_params.link_bcntrld = EDMA_CHAN_SLOT(prtd->asp_link[0]) << 5;
539 edma_write_slot(prtd->asp_link[0], &prtd->asp_params);
542 edma_free_channel(prtd->asp_channel);
543 prtd->asp_channel = -1;
548 static int davinci_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
550 struct davinci_runtime_data *prtd = substream->runtime->private_data;
553 spin_lock(&prtd->lock);
556 case SNDRV_PCM_TRIGGER_START:
557 edma_start(prtd->asp_channel);
558 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
559 prtd->ram_channel >= 0) {
560 /* copy 1st iram buffer */
561 edma_start(prtd->ram_channel);
564 case SNDRV_PCM_TRIGGER_RESUME:
565 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
566 edma_resume(prtd->asp_channel);
568 case SNDRV_PCM_TRIGGER_STOP:
569 case SNDRV_PCM_TRIGGER_SUSPEND:
570 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
571 edma_pause(prtd->asp_channel);
578 spin_unlock(&prtd->lock);
583 static int davinci_pcm_prepare(struct snd_pcm_substream *substream)
585 struct davinci_runtime_data *prtd = substream->runtime->private_data;
587 davinci_pcm_period_reset(substream);
588 if (prtd->ram_channel >= 0) {
589 int ret = ping_pong_dma_setup(substream);
593 edma_write_slot(prtd->ram_channel, &prtd->ram_params);
594 edma_write_slot(prtd->asp_channel, &prtd->asp_params);
596 print_buf_info(prtd->ram_channel, "ram_channel");
597 print_buf_info(prtd->ram_link, "ram_link");
598 print_buf_info(prtd->ram_link2, "ram_link2");
599 print_buf_info(prtd->asp_channel, "asp_channel");
600 print_buf_info(prtd->asp_link[0], "asp_link[0]");
601 print_buf_info(prtd->asp_link[1], "asp_link[1]");
604 * There is a phase offset of 2 periods between the position
605 * used by dma setup and the position reported in the pointer
608 * The phase offset, when not using ping-pong buffers, is due to
609 * the two consecutive calls to davinci_pcm_enqueue_dma() below.
611 * Whereas here, with ping-pong buffers, the phase is due to
612 * there being an entire buffer transfer complete before the
613 * first dma completion event triggers davinci_pcm_dma_irq().
615 davinci_pcm_period_elapsed(substream);
616 davinci_pcm_period_elapsed(substream);
620 davinci_pcm_enqueue_dma(substream);
621 davinci_pcm_period_elapsed(substream);
623 /* Copy self-linked parameter RAM entry into master channel */
624 edma_read_slot(prtd->asp_link[0], &prtd->asp_params);
625 edma_write_slot(prtd->asp_channel, &prtd->asp_params);
626 davinci_pcm_enqueue_dma(substream);
627 davinci_pcm_period_elapsed(substream);
632 static snd_pcm_uframes_t
633 davinci_pcm_pointer(struct snd_pcm_substream *substream)
635 struct snd_pcm_runtime *runtime = substream->runtime;
636 struct davinci_runtime_data *prtd = runtime->private_data;
639 unsigned int period_size = snd_pcm_lib_period_bytes(substream);
642 * There is a phase offset of 2 periods between the position used by dma
643 * setup and the position reported in the pointer function. Either +2 in
644 * the dma setup or -2 here in the pointer function (with wrapping,
645 * both) accounts for this offset -- choose the latter since it makes
646 * the first-time setup clearer.
648 spin_lock(&prtd->lock);
649 asp_count = prtd->period - 2;
650 spin_unlock(&prtd->lock);
653 asp_count += runtime->periods;
654 asp_count *= period_size;
656 offset = bytes_to_frames(runtime, asp_count);
657 if (offset >= runtime->buffer_size)
663 static int davinci_pcm_open(struct snd_pcm_substream *substream)
665 struct snd_pcm_runtime *runtime = substream->runtime;
666 struct davinci_runtime_data *prtd;
667 struct snd_pcm_hardware *ppcm;
669 struct snd_soc_pcm_runtime *rtd = substream->private_data;
670 struct davinci_pcm_dma_params *pa;
671 struct davinci_pcm_dma_params *params;
673 pa = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
676 params = &pa[substream->stream];
678 ppcm = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
679 &pcm_hardware_playback : &pcm_hardware_capture;
680 allocate_sram(substream, params->sram_size, ppcm);
681 snd_soc_set_runtime_hwparams(substream, ppcm);
682 /* ensure that buffer size is a multiple of period size */
683 ret = snd_pcm_hw_constraint_integer(runtime,
684 SNDRV_PCM_HW_PARAM_PERIODS);
688 prtd = kzalloc(sizeof(struct davinci_runtime_data), GFP_KERNEL);
692 spin_lock_init(&prtd->lock);
693 prtd->params = params;
694 prtd->asp_channel = -1;
695 prtd->asp_link[0] = prtd->asp_link[1] = -1;
696 prtd->ram_channel = -1;
698 prtd->ram_link2 = -1;
700 runtime->private_data = prtd;
702 ret = davinci_pcm_dma_request(substream);
704 printk(KERN_ERR "davinci_pcm: Failed to get dma channels\n");
711 static int davinci_pcm_close(struct snd_pcm_substream *substream)
713 struct snd_pcm_runtime *runtime = substream->runtime;
714 struct davinci_runtime_data *prtd = runtime->private_data;
716 if (prtd->ram_channel >= 0)
717 edma_stop(prtd->ram_channel);
718 if (prtd->asp_channel >= 0)
719 edma_stop(prtd->asp_channel);
720 if (prtd->asp_link[0] >= 0)
721 edma_unlink(prtd->asp_link[0]);
722 if (prtd->asp_link[1] >= 0)
723 edma_unlink(prtd->asp_link[1]);
724 if (prtd->ram_link >= 0)
725 edma_unlink(prtd->ram_link);
727 if (prtd->asp_link[0] >= 0)
728 edma_free_slot(prtd->asp_link[0]);
729 if (prtd->asp_link[1] >= 0)
730 edma_free_slot(prtd->asp_link[1]);
731 if (prtd->asp_channel >= 0)
732 edma_free_channel(prtd->asp_channel);
733 if (prtd->ram_link >= 0)
734 edma_free_slot(prtd->ram_link);
735 if (prtd->ram_link2 >= 0)
736 edma_free_slot(prtd->ram_link2);
737 if (prtd->ram_channel >= 0)
738 edma_free_channel(prtd->ram_channel);
745 static int davinci_pcm_hw_params(struct snd_pcm_substream *substream,
746 struct snd_pcm_hw_params *hw_params)
748 return snd_pcm_lib_malloc_pages(substream,
749 params_buffer_bytes(hw_params));
752 static int davinci_pcm_hw_free(struct snd_pcm_substream *substream)
754 return snd_pcm_lib_free_pages(substream);
757 static int davinci_pcm_mmap(struct snd_pcm_substream *substream,
758 struct vm_area_struct *vma)
760 struct snd_pcm_runtime *runtime = substream->runtime;
762 return dma_mmap_writecombine(substream->pcm->card->dev, vma,
768 static struct snd_pcm_ops davinci_pcm_ops = {
769 .open = davinci_pcm_open,
770 .close = davinci_pcm_close,
771 .ioctl = snd_pcm_lib_ioctl,
772 .hw_params = davinci_pcm_hw_params,
773 .hw_free = davinci_pcm_hw_free,
774 .prepare = davinci_pcm_prepare,
775 .trigger = davinci_pcm_trigger,
776 .pointer = davinci_pcm_pointer,
777 .mmap = davinci_pcm_mmap,
780 static int davinci_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream,
783 struct snd_pcm_substream *substream = pcm->streams[stream].substream;
784 struct snd_dma_buffer *buf = &substream->dma_buffer;
786 buf->dev.type = SNDRV_DMA_TYPE_DEV;
787 buf->dev.dev = pcm->card->dev;
788 buf->private_data = NULL;
789 buf->area = dma_alloc_writecombine(pcm->card->dev, size,
790 &buf->addr, GFP_KERNEL);
792 pr_debug("davinci_pcm: preallocate_dma_buffer: area=%p, addr=%p, "
793 "size=%d\n", (void *) buf->area, (void *) buf->addr, size);
802 static void davinci_pcm_free(struct snd_pcm *pcm)
804 struct snd_pcm_substream *substream;
805 struct snd_dma_buffer *buf;
808 for (stream = 0; stream < 2; stream++) {
809 struct snd_dma_buffer *iram_dma;
810 substream = pcm->streams[stream].substream;
814 buf = &substream->dma_buffer;
818 dma_free_writecombine(pcm->card->dev, buf->bytes,
819 buf->area, buf->addr);
821 iram_dma = buf->private_data;
823 sram_free(iram_dma->area, iram_dma->bytes);
829 static u64 davinci_pcm_dmamask = 0xffffffff;
831 static int davinci_pcm_new(struct snd_soc_pcm_runtime *rtd)
833 struct snd_card *card = rtd->card->snd_card;
834 struct snd_pcm *pcm = rtd->pcm;
837 if (!card->dev->dma_mask)
838 card->dev->dma_mask = &davinci_pcm_dmamask;
839 if (!card->dev->coherent_dma_mask)
840 card->dev->coherent_dma_mask = 0xffffffff;
842 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
843 ret = davinci_pcm_preallocate_dma_buffer(pcm,
844 SNDRV_PCM_STREAM_PLAYBACK,
845 pcm_hardware_playback.buffer_bytes_max);
850 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
851 ret = davinci_pcm_preallocate_dma_buffer(pcm,
852 SNDRV_PCM_STREAM_CAPTURE,
853 pcm_hardware_capture.buffer_bytes_max);
861 static struct snd_soc_platform_driver davinci_soc_platform = {
862 .ops = &davinci_pcm_ops,
863 .pcm_new = davinci_pcm_new,
864 .pcm_free = davinci_pcm_free,
867 static int __devinit davinci_soc_platform_probe(struct platform_device *pdev)
869 return snd_soc_register_platform(&pdev->dev, &davinci_soc_platform);
872 static int __devexit davinci_soc_platform_remove(struct platform_device *pdev)
874 snd_soc_unregister_platform(&pdev->dev);
878 static struct platform_driver davinci_pcm_driver = {
880 .name = "davinci-pcm-audio",
881 .owner = THIS_MODULE,
884 .probe = davinci_soc_platform_probe,
885 .remove = __devexit_p(davinci_soc_platform_remove),
888 module_platform_driver(davinci_pcm_driver);
890 MODULE_AUTHOR("Vladimir Barinov");
891 MODULE_DESCRIPTION("TI DAVINCI PCM DMA module");
892 MODULE_LICENSE("GPL");