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 #include <linux/genalloc.h>
  20 #include <linux/platform_data/edma.h>
  21
  22 #include <sound/core.h>
  23 #include <sound/pcm.h>
  24 #include <sound/pcm_params.h>
  25 #include <sound/soc.h>
  26
  27 #include <asm/dma.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 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                  SNDRV_PCM_INFO_BATCH),
  54         .buffer_bytes_max = 128 * 1024,
  55         .period_bytes_min = 32,
  56         .period_bytes_max = 8 * 1024,
  57         .periods_min = 16,
  58         .periods_max = 255,
  59         .fifo_size = 0,
  60 };
  61
  62 static struct snd_pcm_hardware pcm_hardware_capture = {
  63         .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
  64                  SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
  65                  SNDRV_PCM_INFO_PAUSE |
  66                  SNDRV_PCM_INFO_BATCH),
  67         .buffer_bytes_max = 128 * 1024,
  68         .period_bytes_min = 32,
  69         .period_bytes_max = 8 * 1024,
  70         .periods_min = 16,
  71         .periods_max = 255,
  72         .fifo_size = 0,
  73 };
  74
  75 /*
  76  * How ping/pong works....
  77  *
  78  * Playback:
  79  * ram_params - copys 2*ping_size from start of SDRAM to iram,
  80  *      links to ram_link2
  81  * ram_link2 - copys rest of SDRAM to iram in ping_size units,
  82  *      links to ram_link
  83  * ram_link - copys entire SDRAM to iram in ping_size uints,
  84  *      links to self
  85  *
  86  * asp_params - same as asp_link[0]
  87  * asp_link[0] - copys from lower half of iram to asp port
  88  *      links to asp_link[1], triggers iram copy event on completion
  89  * asp_link[1] - copys from upper half of iram to asp port
  90  *      links to asp_link[0], triggers iram copy event on completion
  91  *      triggers interrupt only needed to let upper SOC levels update position
  92  *      in stream on completion
  93  *
  94  * When playback is started:
  95  *      ram_params started
  96  *      asp_params started
  97  *
  98  * Capture:
  99  * ram_params - same as ram_link,
 100  *      links to ram_link
 101  * ram_link - same as playback
 102  *      links to self
 103  *
 104  * asp_params - same as playback
 105  * asp_link[0] - same as playback
 106  * asp_link[1] - same as playback
 107  *
 108  * When capture is started:
 109  *      asp_params started
 110  */
 111 struct davinci_runtime_data {
 112         spinlock_t lock;
 113         int period;             /* current DMA period */
 114         int asp_channel;        /* Master DMA channel */
 115         int asp_link[2];        /* asp parameter link channel, ping/pong */
 116         struct davinci_pcm_dma_params *params;  /* DMA params */
 117         int ram_channel;
 118         int ram_link;
 119         int ram_link2;
 120         struct edmacc_param asp_params;
 121         struct edmacc_param ram_params;
 122 };
 123
 124 static void davinci_pcm_period_elapsed(struct snd_pcm_substream *substream)
 125 {
 126         struct davinci_runtime_data *prtd = substream->runtime->private_data;
 127         struct snd_pcm_runtime *runtime = substream->runtime;
 128
 129         prtd->period++;
 130         if (unlikely(prtd->period >= runtime->periods))
 131                 prtd->period = 0;
 132 }
 133
 134 static void davinci_pcm_period_reset(struct snd_pcm_substream *substream)
 135 {
 136         struct davinci_runtime_data *prtd = substream->runtime->private_data;
 137
 138         prtd->period = 0;
 139 }
 140 /*
 141  * Not used with ping/pong
 142  */
 143 static void davinci_pcm_enqueue_dma(struct snd_pcm_substream *substream)
 144 {
 145         struct davinci_runtime_data *prtd = substream->runtime->private_data;
 146         struct snd_pcm_runtime *runtime = substream->runtime;
 147         unsigned int period_size;
 148         unsigned int dma_offset;
 149         dma_addr_t dma_pos;
 150         dma_addr_t src, dst;
 151         unsigned short src_bidx, dst_bidx;
 152         unsigned short src_cidx, dst_cidx;
 153         unsigned int data_type;
 154         unsigned short acnt;
 155         unsigned int count;
 156         unsigned int fifo_level;
 157
 158         period_size = snd_pcm_lib_period_bytes(substream);
 159         dma_offset = prtd->period * period_size;
 160         dma_pos = runtime->dma_addr + dma_offset;
 161         fifo_level = prtd->params->fifo_level;
 162
 163         pr_debug("davinci_pcm: audio_set_dma_params_play channel = %d "
 164                 "dma_ptr = %x period_size=%x\n", prtd->asp_link[0], dma_pos,
 165                 period_size);
 166
 167         data_type = prtd->params->data_type;
 168         count = period_size / data_type;
 169         if (fifo_level)
 170                 count /= fifo_level;
 171
 172         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 173                 src = dma_pos;
 174                 dst = prtd->params->dma_addr;
 175                 src_bidx = data_type;
 176                 dst_bidx = 4;
 177                 src_cidx = data_type * fifo_level;
 178                 dst_cidx = 0;
 179         } else {
 180                 src = prtd->params->dma_addr;
 181                 dst = dma_pos;
 182                 src_bidx = 0;
 183                 dst_bidx = data_type;
 184                 src_cidx = 0;
 185                 dst_cidx = data_type * fifo_level;
 186         }
 187
 188         acnt = prtd->params->acnt;
 189         edma_set_src(prtd->asp_link[0], src, INCR, W8BIT);
 190         edma_set_dest(prtd->asp_link[0], dst, INCR, W8BIT);
 191
 192         edma_set_src_index(prtd->asp_link[0], src_bidx, src_cidx);
 193         edma_set_dest_index(prtd->asp_link[0], dst_bidx, dst_cidx);
 194
 195         if (!fifo_level)
 196                 edma_set_transfer_params(prtd->asp_link[0], acnt, count, 1, 0,
 197                                                         ASYNC);
 198         else
 199                 edma_set_transfer_params(prtd->asp_link[0], acnt,
 200                                                 fifo_level,
 201                                                 count, fifo_level,
 202                                                 ABSYNC);
 203 }
 204
 205 static void davinci_pcm_dma_irq(unsigned link, u16 ch_status, void *data)
 206 {
 207         struct snd_pcm_substream *substream = data;
 208         struct davinci_runtime_data *prtd = substream->runtime->private_data;
 209
 210         print_buf_info(prtd->ram_channel, "i ram_channel");
 211         pr_debug("davinci_pcm: link=%d, status=0x%x\n", link, ch_status);
 212
 213         if (unlikely(ch_status != EDMA_DMA_COMPLETE))
 214                 return;
 215
 216         if (snd_pcm_running(substream)) {
 217                 spin_lock(&prtd->lock);
 218                 if (prtd->ram_channel < 0) {
 219                         /* No ping/pong must fix up link dma data*/
 220                         davinci_pcm_enqueue_dma(substream);
 221                 }
 222                 davinci_pcm_period_elapsed(substream);
 223                 spin_unlock(&prtd->lock);
 224                 snd_pcm_period_elapsed(substream);
 225         }
 226 }
 227
 228 #ifdef CONFIG_GENERIC_ALLOCATOR
 229 static int allocate_sram(struct snd_pcm_substream *substream,
 230                 struct gen_pool *sram_pool, unsigned size,
 231                 struct snd_pcm_hardware *ppcm)
 232 {
 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;
 237
 238         if (buf->private_data || !size)
 239                 return 0;
 240
 241         ppcm->period_bytes_max = size;
 242         iram_virt = gen_pool_dma_alloc(sram_pool, size, &iram_phys);
 243         if (!iram_virt)
 244                 goto exit1;
 245         iram_dma = kzalloc(sizeof(*iram_dma), GFP_KERNEL);
 246         if (!iram_dma)
 247                 goto exit2;
 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;
 253         return 0;
 254 exit2:
 255         if (iram_virt)
 256                 gen_pool_free(sram_pool, (unsigned)iram_virt, size);
 257 exit1:
 258         return -ENOMEM;
 259 }
 260
 261 static void davinci_free_sram(struct snd_pcm_substream *substream,
 262                               struct snd_dma_buffer *iram_dma)
 263 {
 264         struct davinci_runtime_data *prtd = substream->runtime->private_data;
 265         struct gen_pool *sram_pool = prtd->params->sram_pool;
 266
 267         gen_pool_free(sram_pool, (unsigned) iram_dma->area, iram_dma->bytes);
 268 }
 269 #else
 270 static int allocate_sram(struct snd_pcm_substream *substream,
 271                 struct gen_pool *sram_pool, unsigned size,
 272                 struct snd_pcm_hardware *ppcm)
 273 {
 274         return 0;
 275 }
 276
 277 static void davinci_free_sram(struct snd_pcm_substream *substream,
 278                               struct snd_dma_buffer *iram_dma)
 279 {
 280 }
 281 #endif
 282
 283 /*
 284  * Only used with ping/pong.
 285  * This is called after runtime->dma_addr, period_bytes and data_type are valid
 286  */
 287 static int ping_pong_dma_setup(struct snd_pcm_substream *substream)
 288 {
 289         unsigned short ram_src_cidx, ram_dst_cidx;
 290         struct snd_pcm_runtime *runtime = substream->runtime;
 291         struct davinci_runtime_data *prtd = runtime->private_data;
 292         struct snd_dma_buffer *iram_dma =
 293                 (struct snd_dma_buffer *)substream->dma_buffer.private_data;
 294         struct davinci_pcm_dma_params *params = prtd->params;
 295         unsigned int data_type = params->data_type;
 296         unsigned int acnt = params->acnt;
 297         /* divide by 2 for ping/pong */
 298         unsigned int ping_size = snd_pcm_lib_period_bytes(substream) >> 1;
 299         unsigned int fifo_level = prtd->params->fifo_level;
 300         unsigned int count;
 301         if ((data_type == 0) || (data_type > 4)) {
 302                 printk(KERN_ERR "%s: data_type=%i\n", __func__, data_type);
 303                 return -EINVAL;
 304         }
 305         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 306                 dma_addr_t asp_src_pong = iram_dma->addr + ping_size;
 307                 ram_src_cidx = ping_size;
 308                 ram_dst_cidx = -ping_size;
 309                 edma_set_src(prtd->asp_link[1], asp_src_pong, INCR, W8BIT);
 310
 311                 edma_set_src_index(prtd->asp_link[0], data_type,
 312                                 data_type * fifo_level);
 313                 edma_set_src_index(prtd->asp_link[1], data_type,
 314                                 data_type * fifo_level);
 315
 316                 edma_set_src(prtd->ram_link, runtime->dma_addr, INCR, W32BIT);
 317         } else {
 318                 dma_addr_t asp_dst_pong = iram_dma->addr + ping_size;
 319                 ram_src_cidx = -ping_size;
 320                 ram_dst_cidx = ping_size;
 321                 edma_set_dest(prtd->asp_link[1], asp_dst_pong, INCR, W8BIT);
 322
 323                 edma_set_dest_index(prtd->asp_link[0], data_type,
 324                                 data_type * fifo_level);
 325                 edma_set_dest_index(prtd->asp_link[1], data_type,
 326                                 data_type * fifo_level);
 327
 328                 edma_set_dest(prtd->ram_link, runtime->dma_addr, INCR, W32BIT);
 329         }
 330
 331         if (!fifo_level) {
 332                 count = ping_size / data_type;
 333                 edma_set_transfer_params(prtd->asp_link[0], acnt, count,
 334                                 1, 0, ASYNC);
 335                 edma_set_transfer_params(prtd->asp_link[1], acnt, count,
 336                                 1, 0, ASYNC);
 337         } else {
 338                 count = ping_size / (data_type * fifo_level);
 339                 edma_set_transfer_params(prtd->asp_link[0], acnt, fifo_level,
 340                                 count, fifo_level, ABSYNC);
 341                 edma_set_transfer_params(prtd->asp_link[1], acnt, fifo_level,
 342                                 count, fifo_level, ABSYNC);
 343         }
 344
 345         edma_set_src_index(prtd->ram_link, ping_size, ram_src_cidx);
 346         edma_set_dest_index(prtd->ram_link, ping_size, ram_dst_cidx);
 347         edma_set_transfer_params(prtd->ram_link, ping_size, 2,
 348                         runtime->periods, 2, ASYNC);
 349
 350         /* init master params */
 351         edma_read_slot(prtd->asp_link[0], &prtd->asp_params);
 352         edma_read_slot(prtd->ram_link, &prtd->ram_params);
 353         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 354                 struct edmacc_param p_ram;
 355                 /* Copy entire iram buffer before playback started */
 356                 prtd->ram_params.a_b_cnt = (1 << 16) | (ping_size << 1);
 357                 /* 0 dst_bidx */
 358                 prtd->ram_params.src_dst_bidx = (ping_size << 1);
 359                 /* 0 dst_cidx */
 360                 prtd->ram_params.src_dst_cidx = (ping_size << 1);
 361                 prtd->ram_params.ccnt = 1;
 362
 363                 /* Skip 1st period */
 364                 edma_read_slot(prtd->ram_link, &p_ram);
 365                 p_ram.src += (ping_size << 1);
 366                 p_ram.ccnt -= 1;
 367                 edma_write_slot(prtd->ram_link2, &p_ram);
 368                 /*
 369                  * When 1st started, ram -> iram dma channel will fill the
 370                  * entire iram.  Then, whenever a ping/pong asp buffer finishes,
 371                  * 1/2 iram will be filled.
 372                  */
 373                 prtd->ram_params.link_bcntrld =
 374                         EDMA_CHAN_SLOT(prtd->ram_link2) << 5;
 375         }
 376         return 0;
 377 }
 378
 379 /* 1 asp tx or rx channel using 2 parameter channels
 380  * 1 ram to/from iram channel using 1 parameter channel
 381  *
 382  * Playback
 383  * ram copy channel kicks off first,
 384  * 1st ram copy of entire iram buffer completion kicks off asp channel
 385  * asp tcc always kicks off ram copy of 1/2 iram buffer
 386  *
 387  * Record
 388  * asp channel starts, tcc kicks off ram copy
 389  */
 390 static int request_ping_pong(struct snd_pcm_substream *substream,
 391                 struct davinci_runtime_data *prtd,
 392                 struct snd_dma_buffer *iram_dma)
 393 {
 394         dma_addr_t asp_src_ping;
 395         dma_addr_t asp_dst_ping;
 396         int ret;
 397         struct davinci_pcm_dma_params *params = prtd->params;
 398
 399         /* Request ram master channel */
 400         ret = prtd->ram_channel = edma_alloc_channel(EDMA_CHANNEL_ANY,
 401                                   davinci_pcm_dma_irq, substream,
 402                                   prtd->params->ram_chan_q);
 403         if (ret < 0)
 404                 goto exit1;
 405
 406         /* Request ram link channel */
 407         ret = prtd->ram_link = edma_alloc_slot(
 408                         EDMA_CTLR(prtd->ram_channel), EDMA_SLOT_ANY);
 409         if (ret < 0)
 410                 goto exit2;
 411
 412         ret = prtd->asp_link[1] = edma_alloc_slot(
 413                         EDMA_CTLR(prtd->asp_channel), EDMA_SLOT_ANY);
 414         if (ret < 0)
 415                 goto exit3;
 416
 417         prtd->ram_link2 = -1;
 418         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 419                 ret = prtd->ram_link2 = edma_alloc_slot(
 420                         EDMA_CTLR(prtd->ram_channel), EDMA_SLOT_ANY);
 421                 if (ret < 0)
 422                         goto exit4;
 423         }
 424         /* circle ping-pong buffers */
 425         edma_link(prtd->asp_link[0], prtd->asp_link[1]);
 426         edma_link(prtd->asp_link[1], prtd->asp_link[0]);
 427         /* circle ram buffers */
 428         edma_link(prtd->ram_link, prtd->ram_link);
 429
 430         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 431                 asp_src_ping = iram_dma->addr;
 432                 asp_dst_ping = params->dma_addr;        /* fifo */
 433         } else {
 434                 asp_src_ping = params->dma_addr;        /* fifo */
 435                 asp_dst_ping = iram_dma->addr;
 436         }
 437         /* ping */
 438         edma_set_src(prtd->asp_link[0], asp_src_ping, INCR, W16BIT);
 439         edma_set_dest(prtd->asp_link[0], asp_dst_ping, INCR, W16BIT);
 440         edma_set_src_index(prtd->asp_link[0], 0, 0);
 441         edma_set_dest_index(prtd->asp_link[0], 0, 0);
 442
 443         edma_read_slot(prtd->asp_link[0], &prtd->asp_params);
 444         prtd->asp_params.opt &= ~(TCCMODE | EDMA_TCC(0x3f) | TCINTEN);
 445         prtd->asp_params.opt |= TCCHEN |
 446                 EDMA_TCC(prtd->ram_channel & 0x3f);
 447         edma_write_slot(prtd->asp_link[0], &prtd->asp_params);
 448
 449         /* pong */
 450         edma_set_src(prtd->asp_link[1], asp_src_ping, INCR, W16BIT);
 451         edma_set_dest(prtd->asp_link[1], asp_dst_ping, INCR, W16BIT);
 452         edma_set_src_index(prtd->asp_link[1], 0, 0);
 453         edma_set_dest_index(prtd->asp_link[1], 0, 0);
 454
 455         edma_read_slot(prtd->asp_link[1], &prtd->asp_params);
 456         prtd->asp_params.opt &= ~(TCCMODE | EDMA_TCC(0x3f));
 457         /* interrupt after every pong completion */
 458         prtd->asp_params.opt |= TCINTEN | TCCHEN |
 459                 EDMA_TCC(prtd->ram_channel & 0x3f);
 460         edma_write_slot(prtd->asp_link[1], &prtd->asp_params);
 461
 462         /* ram */
 463         edma_set_src(prtd->ram_link, iram_dma->addr, INCR, W32BIT);
 464         edma_set_dest(prtd->ram_link, iram_dma->addr, INCR, W32BIT);
 465         pr_debug("%s: audio dma channels/slots in use for ram:%u %u %u,"
 466                 "for asp:%u %u %u\n", __func__,
 467                 prtd->ram_channel, prtd->ram_link, prtd->ram_link2,
 468                 prtd->asp_channel, prtd->asp_link[0],
 469                 prtd->asp_link[1]);
 470         return 0;
 471 exit4:
 472         edma_free_channel(prtd->asp_link[1]);
 473         prtd->asp_link[1] = -1;
 474 exit3:
 475         edma_free_channel(prtd->ram_link);
 476         prtd->ram_link = -1;
 477 exit2:
 478         edma_free_channel(prtd->ram_channel);
 479         prtd->ram_channel = -1;
 480 exit1:
 481         return ret;
 482 }
 483
 484 static int davinci_pcm_dma_request(struct snd_pcm_substream *substream)
 485 {
 486         struct snd_dma_buffer *iram_dma;
 487         struct davinci_runtime_data *prtd = substream->runtime->private_data;
 488         struct davinci_pcm_dma_params *params = prtd->params;
 489         int ret;
 490
 491         if (!params)
 492                 return -ENODEV;
 493
 494         /* Request asp master DMA channel */
 495         ret = prtd->asp_channel = edma_alloc_channel(params->channel,
 496                         davinci_pcm_dma_irq, substream,
 497                         prtd->params->asp_chan_q);
 498         if (ret < 0)
 499                 goto exit1;
 500
 501         /* Request asp link channels */
 502         ret = prtd->asp_link[0] = edma_alloc_slot(
 503                         EDMA_CTLR(prtd->asp_channel), EDMA_SLOT_ANY);
 504         if (ret < 0)
 505                 goto exit2;
 506
 507         iram_dma = (struct snd_dma_buffer *)substream->dma_buffer.private_data;
 508         if (iram_dma) {
 509                 if (request_ping_pong(substream, prtd, iram_dma) == 0)
 510                         return 0;
 511                 printk(KERN_WARNING "%s: dma channel allocation failed,"
 512                                 "not using sram\n", __func__);
 513         }
 514
 515         /* Issue transfer completion IRQ when the channel completes a
 516          * transfer, then always reload from the same slot (by a kind
 517          * of loopback link).  The completion IRQ handler will update
 518          * the reload slot with a new buffer.
 519          *
 520          * REVISIT save p_ram here after setting up everything except
 521          * the buffer and its length (ccnt) ... use it as a template
 522          * so davinci_pcm_enqueue_dma() takes less time in IRQ.
 523          */
 524         edma_read_slot(prtd->asp_link[0], &prtd->asp_params);
 525         prtd->asp_params.opt |= TCINTEN |
 526                 EDMA_TCC(EDMA_CHAN_SLOT(prtd->asp_channel));
 527         prtd->asp_params.link_bcntrld = EDMA_CHAN_SLOT(prtd->asp_link[0]) << 5;
 528         edma_write_slot(prtd->asp_link[0], &prtd->asp_params);
 529         return 0;
 530 exit2:
 531         edma_free_channel(prtd->asp_channel);
 532         prtd->asp_channel = -1;
 533 exit1:
 534         return ret;
 535 }
 536
 537 static int davinci_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 538 {
 539         struct davinci_runtime_data *prtd = substream->runtime->private_data;
 540         int ret = 0;
 541
 542         spin_lock(&prtd->lock);
 543
 544         switch (cmd) {
 545         case SNDRV_PCM_TRIGGER_START:
 546                 edma_start(prtd->asp_channel);
 547                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 548                     prtd->ram_channel >= 0) {
 549                         /* copy 1st iram buffer */
 550                         edma_start(prtd->ram_channel);
 551                 }
 552                 break;
 553         case SNDRV_PCM_TRIGGER_RESUME:
 554         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 555                 edma_resume(prtd->asp_channel);
 556                 break;
 557         case SNDRV_PCM_TRIGGER_STOP:
 558         case SNDRV_PCM_TRIGGER_SUSPEND:
 559         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 560                 edma_pause(prtd->asp_channel);
 561                 break;
 562         default:
 563                 ret = -EINVAL;
 564                 break;
 565         }
 566
 567         spin_unlock(&prtd->lock);
 568
 569         return ret;
 570 }
 571
 572 static int davinci_pcm_prepare(struct snd_pcm_substream *substream)
 573 {
 574         struct davinci_runtime_data *prtd = substream->runtime->private_data;
 575
 576         davinci_pcm_period_reset(substream);
 577         if (prtd->ram_channel >= 0) {
 578                 int ret = ping_pong_dma_setup(substream);
 579                 if (ret < 0)
 580                         return ret;
 581
 582                 edma_write_slot(prtd->ram_channel, &prtd->ram_params);
 583                 edma_write_slot(prtd->asp_channel, &prtd->asp_params);
 584
 585                 print_buf_info(prtd->ram_channel, "ram_channel");
 586                 print_buf_info(prtd->ram_link, "ram_link");
 587                 print_buf_info(prtd->ram_link2, "ram_link2");
 588                 print_buf_info(prtd->asp_channel, "asp_channel");
 589                 print_buf_info(prtd->asp_link[0], "asp_link[0]");
 590                 print_buf_info(prtd->asp_link[1], "asp_link[1]");
 591
 592                 /*
 593                  * There is a phase offset of 2 periods between the position
 594                  * used by dma setup and the position reported in the pointer
 595                  * function.
 596                  *
 597                  * The phase offset, when not using ping-pong buffers, is due to
 598                  * the two consecutive calls to davinci_pcm_enqueue_dma() below.
 599                  *
 600                  * Whereas here, with ping-pong buffers, the phase is due to
 601                  * there being an entire buffer transfer complete before the
 602                  * first dma completion event triggers davinci_pcm_dma_irq().
 603                  */
 604                 davinci_pcm_period_elapsed(substream);
 605                 davinci_pcm_period_elapsed(substream);
 606
 607                 return 0;
 608         }
 609         davinci_pcm_enqueue_dma(substream);
 610         davinci_pcm_period_elapsed(substream);
 611
 612         /* Copy self-linked parameter RAM entry into master channel */
 613         edma_read_slot(prtd->asp_link[0], &prtd->asp_params);
 614         edma_write_slot(prtd->asp_channel, &prtd->asp_params);
 615         davinci_pcm_enqueue_dma(substream);
 616         davinci_pcm_period_elapsed(substream);
 617
 618         return 0;
 619 }
 620
 621 static snd_pcm_uframes_t
 622 davinci_pcm_pointer(struct snd_pcm_substream *substream)
 623 {
 624         struct snd_pcm_runtime *runtime = substream->runtime;
 625         struct davinci_runtime_data *prtd = runtime->private_data;
 626         unsigned int offset;
 627         int asp_count;
 628         unsigned int period_size = snd_pcm_lib_period_bytes(substream);
 629
 630         /*
 631          * There is a phase offset of 2 periods between the position used by dma
 632          * setup and the position reported in the pointer function. Either +2 in
 633          * the dma setup or -2 here in the pointer function (with wrapping,
 634          * both) accounts for this offset -- choose the latter since it makes
 635          * the first-time setup clearer.
 636          */
 637         spin_lock(&prtd->lock);
 638         asp_count = prtd->period - 2;
 639         spin_unlock(&prtd->lock);
 640
 641         if (asp_count < 0)
 642                 asp_count += runtime->periods;
 643         asp_count *= period_size;
 644
 645         offset = bytes_to_frames(runtime, asp_count);
 646         if (offset >= runtime->buffer_size)
 647                 offset = 0;
 648
 649         return offset;
 650 }
 651
 652 static int davinci_pcm_open(struct snd_pcm_substream *substream)
 653 {
 654         struct snd_pcm_runtime *runtime = substream->runtime;
 655         struct davinci_runtime_data *prtd;
 656         struct snd_pcm_hardware *ppcm;
 657         int ret = 0;
 658         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 659         struct davinci_pcm_dma_params *pa;
 660         struct davinci_pcm_dma_params *params;
 661
 662         pa = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 663         if (!pa)
 664                 return -ENODEV;
 665         params = &pa[substream->stream];
 666
 667         ppcm = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
 668                         &pcm_hardware_playback : &pcm_hardware_capture;
 669         allocate_sram(substream, params->sram_pool, params->sram_size, ppcm);
 670         snd_soc_set_runtime_hwparams(substream, ppcm);
 671         /* ensure that buffer size is a multiple of period size */
 672         ret = snd_pcm_hw_constraint_integer(runtime,
 673                                                 SNDRV_PCM_HW_PARAM_PERIODS);
 674         if (ret < 0)
 675                 return ret;
 676
 677         prtd = kzalloc(sizeof(struct davinci_runtime_data), GFP_KERNEL);
 678         if (prtd == NULL)
 679                 return -ENOMEM;
 680
 681         spin_lock_init(&prtd->lock);
 682         prtd->params = params;
 683         prtd->asp_channel = -1;
 684         prtd->asp_link[0] = prtd->asp_link[1] = -1;
 685         prtd->ram_channel = -1;
 686         prtd->ram_link = -1;
 687         prtd->ram_link2 = -1;
 688
 689         runtime->private_data = prtd;
 690
 691         ret = davinci_pcm_dma_request(substream);
 692         if (ret) {
 693                 printk(KERN_ERR "davinci_pcm: Failed to get dma channels\n");
 694                 kfree(prtd);
 695         }
 696
 697         return ret;
 698 }
 699
 700 static int davinci_pcm_close(struct snd_pcm_substream *substream)
 701 {
 702         struct snd_pcm_runtime *runtime = substream->runtime;
 703         struct davinci_runtime_data *prtd = runtime->private_data;
 704
 705         if (prtd->ram_channel >= 0)
 706                 edma_stop(prtd->ram_channel);
 707         if (prtd->asp_channel >= 0)
 708                 edma_stop(prtd->asp_channel);
 709         if (prtd->asp_link[0] >= 0)
 710                 edma_unlink(prtd->asp_link[0]);
 711         if (prtd->asp_link[1] >= 0)
 712                 edma_unlink(prtd->asp_link[1]);
 713         if (prtd->ram_link >= 0)
 714                 edma_unlink(prtd->ram_link);
 715
 716         if (prtd->asp_link[0] >= 0)
 717                 edma_free_slot(prtd->asp_link[0]);
 718         if (prtd->asp_link[1] >= 0)
 719                 edma_free_slot(prtd->asp_link[1]);
 720         if (prtd->asp_channel >= 0)
 721                 edma_free_channel(prtd->asp_channel);
 722         if (prtd->ram_link >= 0)
 723                 edma_free_slot(prtd->ram_link);
 724         if (prtd->ram_link2 >= 0)
 725                 edma_free_slot(prtd->ram_link2);
 726         if (prtd->ram_channel >= 0)
 727                 edma_free_channel(prtd->ram_channel);
 728
 729         kfree(prtd);
 730
 731         return 0;
 732 }
 733
 734 static int davinci_pcm_hw_params(struct snd_pcm_substream *substream,
 735                                  struct snd_pcm_hw_params *hw_params)
 736 {
 737         return snd_pcm_lib_malloc_pages(substream,
 738                                         params_buffer_bytes(hw_params));
 739 }
 740
 741 static int davinci_pcm_hw_free(struct snd_pcm_substream *substream)
 742 {
 743         return snd_pcm_lib_free_pages(substream);
 744 }
 745
 746 static int davinci_pcm_mmap(struct snd_pcm_substream *substream,
 747                             struct vm_area_struct *vma)
 748 {
 749         struct snd_pcm_runtime *runtime = substream->runtime;
 750
 751         return dma_mmap_writecombine(substream->pcm->card->dev, vma,
 752                                      runtime->dma_area,
 753                                      runtime->dma_addr,
 754                                      runtime->dma_bytes);
 755 }
 756
 757 static struct snd_pcm_ops davinci_pcm_ops = {
 758         .open =         davinci_pcm_open,
 759         .close =        davinci_pcm_close,
 760         .ioctl =        snd_pcm_lib_ioctl,
 761         .hw_params =    davinci_pcm_hw_params,
 762         .hw_free =      davinci_pcm_hw_free,
 763         .prepare =      davinci_pcm_prepare,
 764         .trigger =      davinci_pcm_trigger,
 765         .pointer =      davinci_pcm_pointer,
 766         .mmap =         davinci_pcm_mmap,
 767 };
 768
 769 static int davinci_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream,
 770                 size_t size)
 771 {
 772         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 773         struct snd_dma_buffer *buf = &substream->dma_buffer;
 774
 775         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 776         buf->dev.dev = pcm->card->dev;
 777         buf->private_data = NULL;
 778         buf->area = dma_alloc_writecombine(pcm->card->dev, size,
 779                                            &buf->addr, GFP_KERNEL);
 780
 781         pr_debug("davinci_pcm: preallocate_dma_buffer: area=%p, addr=%p, "
 782                 "size=%d\n", (void *) buf->area, (void *) buf->addr, size);
 783
 784         if (!buf->area)
 785                 return -ENOMEM;
 786
 787         buf->bytes = size;
 788         return 0;
 789 }
 790
 791 static void davinci_pcm_free(struct snd_pcm *pcm)
 792 {
 793         struct snd_pcm_substream *substream;
 794         struct snd_dma_buffer *buf;
 795         int stream;
 796
 797         for (stream = 0; stream < 2; stream++) {
 798                 struct snd_dma_buffer *iram_dma;
 799                 substream = pcm->streams[stream].substream;
 800                 if (!substream)
 801                         continue;
 802
 803                 buf = &substream->dma_buffer;
 804                 if (!buf->area)
 805                         continue;
 806
 807                 dma_free_writecombine(pcm->card->dev, buf->bytes,
 808                                       buf->area, buf->addr);
 809                 buf->area = NULL;
 810                 iram_dma = buf->private_data;
 811                 if (iram_dma) {
 812                         davinci_free_sram(substream, iram_dma);
 813                         kfree(iram_dma);
 814                 }
 815         }
 816 }
 817
 818 static int davinci_pcm_new(struct snd_soc_pcm_runtime *rtd)
 819 {
 820         struct snd_card *card = rtd->card->snd_card;
 821         struct snd_pcm *pcm = rtd->pcm;
 822         int ret;
 823
 824         ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
 825         if (ret)
 826                 return ret;
 827
 828         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
 829                 ret = davinci_pcm_preallocate_dma_buffer(pcm,
 830                         SNDRV_PCM_STREAM_PLAYBACK,
 831                         pcm_hardware_playback.buffer_bytes_max);
 832                 if (ret)
 833                         return ret;
 834         }
 835
 836         if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
 837                 ret = davinci_pcm_preallocate_dma_buffer(pcm,
 838                         SNDRV_PCM_STREAM_CAPTURE,
 839                         pcm_hardware_capture.buffer_bytes_max);
 840                 if (ret)
 841                         return ret;
 842         }
 843
 844         return 0;
 845 }
 846
 847 static struct snd_soc_platform_driver davinci_soc_platform = {
 848         .ops =          &davinci_pcm_ops,
 849         .pcm_new =      davinci_pcm_new,
 850         .pcm_free =     davinci_pcm_free,
 851 };
 852
 853 int davinci_soc_platform_register(struct device *dev)
 854 {
 855         return devm_snd_soc_register_platform(dev, &davinci_soc_platform);
 856 }
 857 EXPORT_SYMBOL_GPL(davinci_soc_platform_register);
 858
 859 MODULE_AUTHOR("Vladimir Barinov");
 860 MODULE_DESCRIPTION("TI DAVINCI PCM DMA module");
 861 MODULE_LICENSE("GPL");