asoc: tegra: add use_codec_jd_irq to allow AP to be able to use codec irq
[linux-2.6.git] / sound / soc / davinci / davinci-pcm.c
1 /*
2  * ALSA PCM interface for the TI DAVINCI processor
3  *
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>
7  *
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.
11  */
12
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
20 #include <sound/core.h>
21 #include <sound/pcm.h>
22 #include <sound/pcm_params.h>
23 #include <sound/soc.h>
24
25 #include <asm/dma.h>
26 #include <mach/edma.h>
27 #include <mach/sram.h>
28
29 #include "davinci-pcm.h"
30
31 #ifdef DEBUG
32 static void print_buf_info(int slot, char *name)
33 {
34         struct edmacc_param p;
35         if (slot < 0)
36                 return;
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);
42 }
43 #else
44 static void print_buf_info(int slot, char *name)
45 {
46 }
47 #endif
48
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)
64
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 |
75                   SNDRV_PCM_RATE_KNOT),
76         .rate_min = 8000,
77         .rate_max = 96000,
78         .channels_min = 2,
79         .channels_max = 384,
80         .buffer_bytes_max = 128 * 1024,
81         .period_bytes_min = 32,
82         .period_bytes_max = 8 * 1024,
83         .periods_min = 16,
84         .periods_max = 255,
85         .fifo_size = 0,
86 };
87
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 |
98                   SNDRV_PCM_RATE_KNOT),
99         .rate_min = 8000,
100         .rate_max = 96000,
101         .channels_min = 2,
102         .channels_max = 384,
103         .buffer_bytes_max = 128 * 1024,
104         .period_bytes_min = 32,
105         .period_bytes_max = 8 * 1024,
106         .periods_min = 16,
107         .periods_max = 255,
108         .fifo_size = 0,
109 };
110
111 /*
112  * How ping/pong works....
113  *
114  * Playback:
115  * ram_params - copys 2*ping_size from start of SDRAM to iram,
116  *      links to ram_link2
117  * ram_link2 - copys rest of SDRAM to iram in ping_size units,
118  *      links to ram_link
119  * ram_link - copys entire SDRAM to iram in ping_size uints,
120  *      links to self
121  *
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
129  *
130  * When playback is started:
131  *      ram_params started
132  *      asp_params started
133  *
134  * Capture:
135  * ram_params - same as ram_link,
136  *      links to ram_link
137  * ram_link - same as playback
138  *      links to self
139  *
140  * asp_params - same as playback
141  * asp_link[0] - same as playback
142  * asp_link[1] - same as playback
143  *
144  * When capture is started:
145  *      asp_params started
146  */
147 struct davinci_runtime_data {
148         spinlock_t lock;
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 */
153         int ram_channel;
154         int ram_link;
155         int ram_link2;
156         struct edmacc_param asp_params;
157         struct edmacc_param ram_params;
158 };
159
160 static void davinci_pcm_period_elapsed(struct snd_pcm_substream *substream)
161 {
162         struct davinci_runtime_data *prtd = substream->runtime->private_data;
163         struct snd_pcm_runtime *runtime = substream->runtime;
164
165         prtd->period++;
166         if (unlikely(prtd->period >= runtime->periods))
167                 prtd->period = 0;
168 }
169
170 static void davinci_pcm_period_reset(struct snd_pcm_substream *substream)
171 {
172         struct davinci_runtime_data *prtd = substream->runtime->private_data;
173
174         prtd->period = 0;
175 }
176 /*
177  * Not used with ping/pong
178  */
179 static void davinci_pcm_enqueue_dma(struct snd_pcm_substream *substream)
180 {
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;
185         dma_addr_t dma_pos;
186         dma_addr_t src, dst;
187         unsigned short src_bidx, dst_bidx;
188         unsigned short src_cidx, dst_cidx;
189         unsigned int data_type;
190         unsigned short acnt;
191         unsigned int count;
192         unsigned int fifo_level;
193
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;
198
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,
201                 period_size);
202
203         data_type = prtd->params->data_type;
204         count = period_size / data_type;
205         if (fifo_level)
206                 count /= fifo_level;
207
208         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
209                 src = dma_pos;
210                 dst = prtd->params->dma_addr;
211                 src_bidx = data_type;
212                 dst_bidx = 0;
213                 src_cidx = data_type * fifo_level;
214                 dst_cidx = 0;
215         } else {
216                 src = prtd->params->dma_addr;
217                 dst = dma_pos;
218                 src_bidx = 0;
219                 dst_bidx = data_type;
220                 src_cidx = 0;
221                 dst_cidx = data_type * fifo_level;
222         }
223
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);
227
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);
230
231         if (!fifo_level)
232                 edma_set_transfer_params(prtd->asp_link[0], acnt, count, 1, 0,
233                                                         ASYNC);
234         else
235                 edma_set_transfer_params(prtd->asp_link[0], acnt, fifo_level,
236                                                         count, fifo_level,
237                                                         ABSYNC);
238 }
239
240 static void davinci_pcm_dma_irq(unsigned link, u16 ch_status, void *data)
241 {
242         struct snd_pcm_substream *substream = data;
243         struct davinci_runtime_data *prtd = substream->runtime->private_data;
244
245         print_buf_info(prtd->ram_channel, "i ram_channel");
246         pr_debug("davinci_pcm: link=%d, status=0x%x\n", link, ch_status);
247
248         if (unlikely(ch_status != DMA_COMPLETE))
249                 return;
250
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);
256                 }
257                 davinci_pcm_period_elapsed(substream);
258                 spin_unlock(&prtd->lock);
259                 snd_pcm_period_elapsed(substream);
260         }
261 }
262
263 static int allocate_sram(struct snd_pcm_substream *substream, unsigned size,
264                 struct snd_pcm_hardware *ppcm)
265 {
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;
270
271         if (buf->private_data || !size)
272                 return 0;
273
274         ppcm->period_bytes_max = size;
275         iram_virt = sram_alloc(size, &iram_phys);
276         if (!iram_virt)
277                 goto exit1;
278         iram_dma = kzalloc(sizeof(*iram_dma), GFP_KERNEL);
279         if (!iram_dma)
280                 goto exit2;
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;
286         return 0;
287 exit2:
288         if (iram_virt)
289                 sram_free(iram_virt, size);
290 exit1:
291         return -ENOMEM;
292 }
293
294 /*
295  * Only used with ping/pong.
296  * This is called after runtime->dma_addr, period_bytes and data_type are valid
297  */
298 static int ping_pong_dma_setup(struct snd_pcm_substream *substream)
299 {
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;
311         unsigned int count;
312         if ((data_type == 0) || (data_type > 4)) {
313                 printk(KERN_ERR "%s: data_type=%i\n", __func__, data_type);
314                 return -EINVAL;
315         }
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);
321
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);
326
327                 edma_set_src(prtd->ram_link, runtime->dma_addr, INCR, W32BIT);
328         } else {
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);
333
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);
338
339                 edma_set_dest(prtd->ram_link, runtime->dma_addr, INCR, W32BIT);
340         }
341
342         if (!fifo_level) {
343                 count = ping_size / data_type;
344                 edma_set_transfer_params(prtd->asp_link[0], acnt, count,
345                                 1, 0, ASYNC);
346                 edma_set_transfer_params(prtd->asp_link[1], acnt, count,
347                                 1, 0, ASYNC);
348         } else {
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);
354         }
355
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);
360
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);
368                 /* 0 dst_bidx */
369                 prtd->ram_params.src_dst_bidx = (ping_size << 1);
370                 /* 0 dst_cidx */
371                 prtd->ram_params.src_dst_cidx = (ping_size << 1);
372                 prtd->ram_params.ccnt = 1;
373
374                 /* Skip 1st period */
375                 edma_read_slot(prtd->ram_link, &p_ram);
376                 p_ram.src += (ping_size << 1);
377                 p_ram.ccnt -= 1;
378                 edma_write_slot(prtd->ram_link2, &p_ram);
379                 /*
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.
383                  */
384                 prtd->ram_params.link_bcntrld =
385                         EDMA_CHAN_SLOT(prtd->ram_link2) << 5;
386         }
387         return 0;
388 }
389
390 /* 1 asp tx or rx channel using 2 parameter channels
391  * 1 ram to/from iram channel using 1 parameter channel
392  *
393  * Playback
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
397  *
398  * Record
399  * asp channel starts, tcc kicks off ram copy
400  */
401 static int request_ping_pong(struct snd_pcm_substream *substream,
402                 struct davinci_runtime_data *prtd,
403                 struct snd_dma_buffer *iram_dma)
404 {
405         dma_addr_t asp_src_ping;
406         dma_addr_t asp_dst_ping;
407         int ret;
408         struct davinci_pcm_dma_params *params = prtd->params;
409
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);
414         if (ret < 0)
415                 goto exit1;
416
417         /* Request ram link channel */
418         ret = prtd->ram_link = edma_alloc_slot(
419                         EDMA_CTLR(prtd->ram_channel), EDMA_SLOT_ANY);
420         if (ret < 0)
421                 goto exit2;
422
423         ret = prtd->asp_link[1] = edma_alloc_slot(
424                         EDMA_CTLR(prtd->asp_channel), EDMA_SLOT_ANY);
425         if (ret < 0)
426                 goto exit3;
427
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);
432                 if (ret < 0)
433                         goto exit4;
434         }
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);
440
441         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
442                 asp_src_ping = iram_dma->addr;
443                 asp_dst_ping = params->dma_addr;        /* fifo */
444         } else {
445                 asp_src_ping = params->dma_addr;        /* fifo */
446                 asp_dst_ping = iram_dma->addr;
447         }
448         /* ping */
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);
453
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);
459
460         /* pong */
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);
465
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);
472
473         /* ram */
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],
480                 prtd->asp_link[1]);
481         return 0;
482 exit4:
483         edma_free_channel(prtd->asp_link[1]);
484         prtd->asp_link[1] = -1;
485 exit3:
486         edma_free_channel(prtd->ram_link);
487         prtd->ram_link = -1;
488 exit2:
489         edma_free_channel(prtd->ram_channel);
490         prtd->ram_channel = -1;
491 exit1:
492         return ret;
493 }
494
495 static int davinci_pcm_dma_request(struct snd_pcm_substream *substream)
496 {
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;
500         int ret;
501
502         if (!params)
503                 return -ENODEV;
504
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);
509         if (ret < 0)
510                 goto exit1;
511
512         /* Request asp link channels */
513         ret = prtd->asp_link[0] = edma_alloc_slot(
514                         EDMA_CTLR(prtd->asp_channel), EDMA_SLOT_ANY);
515         if (ret < 0)
516                 goto exit2;
517
518         iram_dma = (struct snd_dma_buffer *)substream->dma_buffer.private_data;
519         if (iram_dma) {
520                 if (request_ping_pong(substream, prtd, iram_dma) == 0)
521                         return 0;
522                 printk(KERN_WARNING "%s: dma channel allocation failed,"
523                                 "not using sram\n", __func__);
524         }
525
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.
530          *
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.
534          */
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);
540         return 0;
541 exit2:
542         edma_free_channel(prtd->asp_channel);
543         prtd->asp_channel = -1;
544 exit1:
545         return ret;
546 }
547
548 static int davinci_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
549 {
550         struct davinci_runtime_data *prtd = substream->runtime->private_data;
551         int ret = 0;
552
553         spin_lock(&prtd->lock);
554
555         switch (cmd) {
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);
562                 }
563                 break;
564         case SNDRV_PCM_TRIGGER_RESUME:
565         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
566                 edma_resume(prtd->asp_channel);
567                 break;
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);
572                 break;
573         default:
574                 ret = -EINVAL;
575                 break;
576         }
577
578         spin_unlock(&prtd->lock);
579
580         return ret;
581 }
582
583 static int davinci_pcm_prepare(struct snd_pcm_substream *substream)
584 {
585         struct davinci_runtime_data *prtd = substream->runtime->private_data;
586
587         davinci_pcm_period_reset(substream);
588         if (prtd->ram_channel >= 0) {
589                 int ret = ping_pong_dma_setup(substream);
590                 if (ret < 0)
591                         return ret;
592
593                 edma_write_slot(prtd->ram_channel, &prtd->ram_params);
594                 edma_write_slot(prtd->asp_channel, &prtd->asp_params);
595
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]");
602
603                 /*
604                  * There is a phase offset of 2 periods between the position
605                  * used by dma setup and the position reported in the pointer
606                  * function.
607                  *
608                  * The phase offset, when not using ping-pong buffers, is due to
609                  * the two consecutive calls to davinci_pcm_enqueue_dma() below.
610                  *
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().
614                  */
615                 davinci_pcm_period_elapsed(substream);
616                 davinci_pcm_period_elapsed(substream);
617
618                 return 0;
619         }
620         davinci_pcm_enqueue_dma(substream);
621         davinci_pcm_period_elapsed(substream);
622
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);
628
629         return 0;
630 }
631
632 static snd_pcm_uframes_t
633 davinci_pcm_pointer(struct snd_pcm_substream *substream)
634 {
635         struct snd_pcm_runtime *runtime = substream->runtime;
636         struct davinci_runtime_data *prtd = runtime->private_data;
637         unsigned int offset;
638         int asp_count;
639         unsigned int period_size = snd_pcm_lib_period_bytes(substream);
640
641         /*
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.
647          */
648         spin_lock(&prtd->lock);
649         asp_count = prtd->period - 2;
650         spin_unlock(&prtd->lock);
651
652         if (asp_count < 0)
653                 asp_count += runtime->periods;
654         asp_count *= period_size;
655
656         offset = bytes_to_frames(runtime, asp_count);
657         if (offset >= runtime->buffer_size)
658                 offset = 0;
659
660         return offset;
661 }
662
663 static int davinci_pcm_open(struct snd_pcm_substream *substream)
664 {
665         struct snd_pcm_runtime *runtime = substream->runtime;
666         struct davinci_runtime_data *prtd;
667         struct snd_pcm_hardware *ppcm;
668         int ret = 0;
669         struct snd_soc_pcm_runtime *rtd = substream->private_data;
670         struct davinci_pcm_dma_params *pa;
671         struct davinci_pcm_dma_params *params;
672
673         pa = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
674         if (!pa)
675                 return -ENODEV;
676         params = &pa[substream->stream];
677
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);
685         if (ret < 0)
686                 return ret;
687
688         prtd = kzalloc(sizeof(struct davinci_runtime_data), GFP_KERNEL);
689         if (prtd == NULL)
690                 return -ENOMEM;
691
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;
697         prtd->ram_link = -1;
698         prtd->ram_link2 = -1;
699
700         runtime->private_data = prtd;
701
702         ret = davinci_pcm_dma_request(substream);
703         if (ret) {
704                 printk(KERN_ERR "davinci_pcm: Failed to get dma channels\n");
705                 kfree(prtd);
706         }
707
708         return ret;
709 }
710
711 static int davinci_pcm_close(struct snd_pcm_substream *substream)
712 {
713         struct snd_pcm_runtime *runtime = substream->runtime;
714         struct davinci_runtime_data *prtd = runtime->private_data;
715
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);
726
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);
739
740         kfree(prtd);
741
742         return 0;
743 }
744
745 static int davinci_pcm_hw_params(struct snd_pcm_substream *substream,
746                                  struct snd_pcm_hw_params *hw_params)
747 {
748         return snd_pcm_lib_malloc_pages(substream,
749                                         params_buffer_bytes(hw_params));
750 }
751
752 static int davinci_pcm_hw_free(struct snd_pcm_substream *substream)
753 {
754         return snd_pcm_lib_free_pages(substream);
755 }
756
757 static int davinci_pcm_mmap(struct snd_pcm_substream *substream,
758                             struct vm_area_struct *vma)
759 {
760         struct snd_pcm_runtime *runtime = substream->runtime;
761
762         return dma_mmap_writecombine(substream->pcm->card->dev, vma,
763                                      runtime->dma_area,
764                                      runtime->dma_addr,
765                                      runtime->dma_bytes);
766 }
767
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,
778 };
779
780 static int davinci_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream,
781                 size_t size)
782 {
783         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
784         struct snd_dma_buffer *buf = &substream->dma_buffer;
785
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);
791
792         pr_debug("davinci_pcm: preallocate_dma_buffer: area=%p, addr=%p, "
793                 "size=%d\n", (void *) buf->area, (void *) buf->addr, size);
794
795         if (!buf->area)
796                 return -ENOMEM;
797
798         buf->bytes = size;
799         return 0;
800 }
801
802 static void davinci_pcm_free(struct snd_pcm *pcm)
803 {
804         struct snd_pcm_substream *substream;
805         struct snd_dma_buffer *buf;
806         int stream;
807
808         for (stream = 0; stream < 2; stream++) {
809                 struct snd_dma_buffer *iram_dma;
810                 substream = pcm->streams[stream].substream;
811                 if (!substream)
812                         continue;
813
814                 buf = &substream->dma_buffer;
815                 if (!buf->area)
816                         continue;
817
818                 dma_free_writecombine(pcm->card->dev, buf->bytes,
819                                       buf->area, buf->addr);
820                 buf->area = NULL;
821                 iram_dma = buf->private_data;
822                 if (iram_dma) {
823                         sram_free(iram_dma->area, iram_dma->bytes);
824                         kfree(iram_dma);
825                 }
826         }
827 }
828
829 static u64 davinci_pcm_dmamask = DMA_BIT_MASK(32);
830
831 static int davinci_pcm_new(struct snd_soc_pcm_runtime *rtd)
832 {
833         struct snd_card *card = rtd->card->snd_card;
834         struct snd_pcm *pcm = rtd->pcm;
835         int ret;
836
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 = DMA_BIT_MASK(32);
841
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);
846                 if (ret)
847                         return ret;
848         }
849
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);
854                 if (ret)
855                         return ret;
856         }
857
858         return 0;
859 }
860
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,
865 };
866
867 static int __devinit davinci_soc_platform_probe(struct platform_device *pdev)
868 {
869         return snd_soc_register_platform(&pdev->dev, &davinci_soc_platform);
870 }
871
872 static int __devexit davinci_soc_platform_remove(struct platform_device *pdev)
873 {
874         snd_soc_unregister_platform(&pdev->dev);
875         return 0;
876 }
877
878 static struct platform_driver davinci_pcm_driver = {
879         .driver = {
880                         .name = "davinci-pcm-audio",
881                         .owner = THIS_MODULE,
882         },
883
884         .probe = davinci_soc_platform_probe,
885         .remove = __devexit_p(davinci_soc_platform_remove),
886 };
887
888 module_platform_driver(davinci_pcm_driver);
889
890 MODULE_AUTHOR("Vladimir Barinov");
891 MODULE_DESCRIPTION("TI DAVINCI PCM DMA module");
892 MODULE_LICENSE("GPL");