release/src-rt-6.x.4708/linux/linux-2.6.36/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 static struct snd_pcm_hardware pcm_hardware_playback = {
  50         .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
  51                  SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
  52                  SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME),
  53         .formats = (SNDRV_PCM_FMTBIT_S16_LE),
  54         .rates = (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 |
  55                   SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 |
  56                   SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 |
  57                   SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000 |
  58                   SNDRV_PCM_RATE_KNOT),
  59         .rate_min = 8000,
  60         .rate_max = 96000,
  61         .channels_min = 2,
  62         .channels_max = 2,
  63         .buffer_bytes_max = 128 * 1024,
  64         .period_bytes_min = 32,
  65         .period_bytes_max = 8 * 1024,
  66         .periods_min = 16,
  67         .periods_max = 255,
  68         .fifo_size = 0,
  69 };
  70
  71 static struct snd_pcm_hardware pcm_hardware_capture = {
  72         .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
  73                  SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
  74                  SNDRV_PCM_INFO_PAUSE),
  75         .formats = (SNDRV_PCM_FMTBIT_S16_LE),
  76         .rates = (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 |
  77                   SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 |
  78                   SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 |
  79                   SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000 |
  80                   SNDRV_PCM_RATE_KNOT),
  81         .rate_min = 8000,
  82         .rate_max = 96000,
  83         .channels_min = 2,
  84         .channels_max = 2,
  85         .buffer_bytes_max = 128 * 1024,
  86         .period_bytes_min = 32,
  87         .period_bytes_max = 8 * 1024,
  88         .periods_min = 16,
  89         .periods_max = 255,
  90         .fifo_size = 0,
  91 };
  92
  93 /*
  94  * How ping/pong works....
  95  *
  96  * Playback:
  97  * ram_params - copys 2*ping_size from start of SDRAM to iram,
  98  *      links to ram_link2
  99  * ram_link2 - copys rest of SDRAM to iram in ping_size units,
 100  *      links to ram_link
 101  * ram_link - copys entire SDRAM to iram in ping_size uints,
 102  *      links to self
 103  *
 104  * asp_params - same as asp_link[0]
 105  * asp_link[0] - copys from lower half of iram to asp port
 106  *      links to asp_link[1], triggers iram copy event on completion
 107  * asp_link[1] - copys from upper half of iram to asp port
 108  *      links to asp_link[0], triggers iram copy event on completion
 109  *      triggers interrupt only needed to let upper SOC levels update position
 110  *      in stream on completion
 111  *
 112  * When playback is started:
 113  *      ram_params started
 114  *      asp_params started
 115  *
 116  * Capture:
 117  * ram_params - same as ram_link,
 118  *      links to ram_link
 119  * ram_link - same as playback
 120  *      links to self
 121  *
 122  * asp_params - same as playback
 123  * asp_link[0] - same as playback
 124  * asp_link[1] - same as playback
 125  *
 126  * When capture is started:
 127  *      asp_params started
 128  */
 129 struct davinci_runtime_data {
 130         spinlock_t lock;
 131         int period;             /* current DMA period */
 132         int asp_channel;        /* Master DMA channel */
 133         int asp_link[2];        /* asp parameter link channel, ping/pong */
 134         struct davinci_pcm_dma_params *params;  /* DMA params */
 135         int ram_channel;
 136         int ram_link;
 137         int ram_link2;
 138         struct edmacc_param asp_params;
 139         struct edmacc_param ram_params;
 140 };
 141
 142 /*
 143  * Not used with ping/pong
 144  */
 145 static void davinci_pcm_enqueue_dma(struct snd_pcm_substream *substream)
 146 {
 147         struct davinci_runtime_data *prtd = substream->runtime->private_data;
 148         struct snd_pcm_runtime *runtime = substream->runtime;
 149         int link = prtd->asp_link[0];
 150         unsigned int period_size;
 151         unsigned int dma_offset;
 152         dma_addr_t dma_pos;
 153         dma_addr_t src, dst;
 154         unsigned short src_bidx, dst_bidx;
 155         unsigned short src_cidx, dst_cidx;
 156         unsigned int data_type;
 157         unsigned short acnt;
 158         unsigned int count;
 159         unsigned int fifo_level;
 160
 161         period_size = snd_pcm_lib_period_bytes(substream);
 162         dma_offset = prtd->period * period_size;
 163         dma_pos = runtime->dma_addr + dma_offset;
 164         fifo_level = prtd->params->fifo_level;
 165
 166         pr_debug("davinci_pcm: audio_set_dma_params_play channel = %d "
 167                 "dma_ptr = %x period_size=%x\n", link, dma_pos, period_size);
 168
 169         data_type = prtd->params->data_type;
 170         count = period_size / data_type;
 171         if (fifo_level)
 172                 count /= fifo_level;
 173
 174         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 175                 src = dma_pos;
 176                 dst = prtd->params->dma_addr;
 177                 src_bidx = data_type;
 178                 dst_bidx = 0;
 179                 src_cidx = data_type * fifo_level;
 180                 dst_cidx = 0;
 181         } else {
 182                 src = prtd->params->dma_addr;
 183                 dst = dma_pos;
 184                 src_bidx = 0;
 185                 dst_bidx = data_type;
 186                 src_cidx = 0;
 187                 dst_cidx = data_type * fifo_level;
 188         }
 189
 190         acnt = prtd->params->acnt;
 191         edma_set_src(link, src, INCR, W8BIT);
 192         edma_set_dest(link, dst, INCR, W8BIT);
 193
 194         edma_set_src_index(link, src_bidx, src_cidx);
 195         edma_set_dest_index(link, dst_bidx, dst_cidx);
 196
 197         if (!fifo_level)
 198                 edma_set_transfer_params(link, acnt, count, 1, 0, ASYNC);
 199         else
 200                 edma_set_transfer_params(link, acnt, fifo_level, count,
 201                                                         fifo_level, ABSYNC);
 202
 203         prtd->period++;
 204         if (unlikely(prtd->period >= runtime->periods))
 205                 prtd->period = 0;
 206 }
 207
 208 static void davinci_pcm_dma_irq(unsigned link, u16 ch_status, void *data)
 209 {
 210         struct snd_pcm_substream *substream = data;
 211         struct davinci_runtime_data *prtd = substream->runtime->private_data;
 212
 213         print_buf_info(prtd->ram_channel, "i ram_channel");
 214         pr_debug("davinci_pcm: link=%d, status=0x%x\n", link, ch_status);
 215
 216         if (unlikely(ch_status != DMA_COMPLETE))
 217                 return;
 218
 219         if (snd_pcm_running(substream)) {
 220                 if (prtd->ram_channel < 0) {
 221                         /* No ping/pong must fix up link dma data*/
 222                         spin_lock(&prtd->lock);
 223                         davinci_pcm_enqueue_dma(substream);
 224                         spin_unlock(&prtd->lock);
 225                 }
 226                 snd_pcm_period_elapsed(substream);
 227         }
 228 }
 229
 230 static int allocate_sram(struct snd_pcm_substream *substream, 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 = sram_alloc(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                 sram_free(iram_virt, size);
 257 exit1:
 258         return -ENOMEM;
 259 }
 260
 261 /*
 262  * Only used with ping/pong.
 263  * This is called after runtime->dma_addr, period_bytes and data_type are valid
 264  */
 265 static int ping_pong_dma_setup(struct snd_pcm_substream *substream)
 266 {
 267         unsigned short ram_src_cidx, ram_dst_cidx;
 268         struct snd_pcm_runtime *runtime = substream->runtime;
 269         struct davinci_runtime_data *prtd = runtime->private_data;
 270         struct snd_dma_buffer *iram_dma =
 271                 (struct snd_dma_buffer *)substream->dma_buffer.private_data;
 272         struct davinci_pcm_dma_params *params = prtd->params;
 273         unsigned int data_type = params->data_type;
 274         unsigned int acnt = params->acnt;
 275         /* divide by 2 for ping/pong */
 276         unsigned int ping_size = snd_pcm_lib_period_bytes(substream) >> 1;
 277         int link = prtd->asp_link[1];
 278         unsigned int fifo_level = prtd->params->fifo_level;
 279         unsigned int count;
 280         if ((data_type == 0) || (data_type > 4)) {
 281                 printk(KERN_ERR "%s: data_type=%i\n", __func__, data_type);
 282                 return -EINVAL;
 283         }
 284         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 285                 dma_addr_t asp_src_pong = iram_dma->addr + ping_size;
 286                 ram_src_cidx = ping_size;
 287                 ram_dst_cidx = -ping_size;
 288                 edma_set_src(link, asp_src_pong, INCR, W8BIT);
 289
 290                 link = prtd->asp_link[0];
 291                 edma_set_src_index(link, data_type, data_type * fifo_level);
 292                 link = prtd->asp_link[1];
 293                 edma_set_src_index(link, data_type, data_type * fifo_level);
 294
 295                 link = prtd->ram_link;
 296                 edma_set_src(link, runtime->dma_addr, INCR, W32BIT);
 297         } else {
 298                 dma_addr_t asp_dst_pong = iram_dma->addr + ping_size;
 299                 ram_src_cidx = -ping_size;
 300                 ram_dst_cidx = ping_size;
 301                 edma_set_dest(link, asp_dst_pong, INCR, W8BIT);
 302
 303                 link = prtd->asp_link[0];
 304                 edma_set_dest_index(link, data_type, data_type * fifo_level);
 305                 link = prtd->asp_link[1];
 306                 edma_set_dest_index(link, data_type, data_type * fifo_level);
 307
 308                 link = prtd->ram_link;
 309                 edma_set_dest(link, runtime->dma_addr, INCR, W32BIT);
 310         }
 311
 312         if (!fifo_level) {
 313                 count = ping_size / data_type;
 314                 edma_set_transfer_params(prtd->asp_link[0], acnt, count,
 315                                 1, 0, ASYNC);
 316                 edma_set_transfer_params(prtd->asp_link[1], acnt, count,
 317                                 1, 0, ASYNC);
 318         } else {
 319                 count = ping_size / (data_type * fifo_level);
 320                 edma_set_transfer_params(prtd->asp_link[0], acnt, fifo_level,
 321                                 count, fifo_level, ABSYNC);
 322                 edma_set_transfer_params(prtd->asp_link[1], acnt, fifo_level,
 323                                 count, fifo_level, ABSYNC);
 324         }
 325
 326         link = prtd->ram_link;
 327         edma_set_src_index(link, ping_size, ram_src_cidx);
 328         edma_set_dest_index(link, ping_size, ram_dst_cidx);
 329         edma_set_transfer_params(link, ping_size, 2,
 330                         runtime->periods, 2, ASYNC);
 331
 332         /* init master params */
 333         edma_read_slot(prtd->asp_link[0], &prtd->asp_params);
 334         edma_read_slot(prtd->ram_link, &prtd->ram_params);
 335         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 336                 struct edmacc_param p_ram;
 337                 /* Copy entire iram buffer before playback started */
 338                 prtd->ram_params.a_b_cnt = (1 << 16) | (ping_size << 1);
 339                 /* 0 dst_bidx */
 340                 prtd->ram_params.src_dst_bidx = (ping_size << 1);
 341                 /* 0 dst_cidx */
 342                 prtd->ram_params.src_dst_cidx = (ping_size << 1);
 343                 prtd->ram_params.ccnt = 1;
 344
 345                 /* Skip 1st period */
 346                 edma_read_slot(prtd->ram_link, &p_ram);
 347                 p_ram.src += (ping_size << 1);
 348                 p_ram.ccnt -= 1;
 349                 edma_write_slot(prtd->ram_link2, &p_ram);
 350                 /*
 351                  * When 1st started, ram -> iram dma channel will fill the
 352                  * entire iram.  Then, whenever a ping/pong asp buffer finishes,
 353                  * 1/2 iram will be filled.
 354                  */
 355                 prtd->ram_params.link_bcntrld =
 356                         EDMA_CHAN_SLOT(prtd->ram_link2) << 5;
 357         }
 358         return 0;
 359 }
 360
 361 /* 1 asp tx or rx channel using 2 parameter channels
 362  * 1 ram to/from iram channel using 1 parameter channel
 363  *
 364  * Playback
 365  * ram copy channel kicks off first,
 366  * 1st ram copy of entire iram buffer completion kicks off asp channel
 367  * asp tcc always kicks off ram copy of 1/2 iram buffer
 368  *
 369  * Record
 370  * asp channel starts, tcc kicks off ram copy
 371  */
 372 static int request_ping_pong(struct snd_pcm_substream *substream,
 373                 struct davinci_runtime_data *prtd,
 374                 struct snd_dma_buffer *iram_dma)
 375 {
 376         dma_addr_t asp_src_ping;
 377         dma_addr_t asp_dst_ping;
 378         int link;
 379         struct davinci_pcm_dma_params *params = prtd->params;
 380
 381         /* Request ram master channel */
 382         link = prtd->ram_channel = edma_alloc_channel(EDMA_CHANNEL_ANY,
 383                                   davinci_pcm_dma_irq, substream,
 384                                   prtd->params->ram_chan_q);
 385         if (link < 0)
 386                 goto exit1;
 387
 388         /* Request ram link channel */
 389         link = prtd->ram_link = edma_alloc_slot(
 390                         EDMA_CTLR(prtd->ram_channel), EDMA_SLOT_ANY);
 391         if (link < 0)
 392                 goto exit2;
 393
 394         link = prtd->asp_link[1] = edma_alloc_slot(
 395                         EDMA_CTLR(prtd->asp_channel), EDMA_SLOT_ANY);
 396         if (link < 0)
 397                 goto exit3;
 398
 399         prtd->ram_link2 = -1;
 400         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 401                 link = prtd->ram_link2 = edma_alloc_slot(
 402                         EDMA_CTLR(prtd->ram_channel), EDMA_SLOT_ANY);
 403                 if (link < 0)
 404                         goto exit4;
 405         }
 406         /* circle ping-pong buffers */
 407         edma_link(prtd->asp_link[0], prtd->asp_link[1]);
 408         edma_link(prtd->asp_link[1], prtd->asp_link[0]);
 409         /* circle ram buffers */
 410         edma_link(prtd->ram_link, prtd->ram_link);
 411
 412         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 413                 asp_src_ping = iram_dma->addr;
 414                 asp_dst_ping = params->dma_addr;        /* fifo */
 415         } else {
 416                 asp_src_ping = params->dma_addr;        /* fifo */
 417                 asp_dst_ping = iram_dma->addr;
 418         }
 419         /* ping */
 420         link = prtd->asp_link[0];
 421         edma_set_src(link, asp_src_ping, INCR, W16BIT);
 422         edma_set_dest(link, asp_dst_ping, INCR, W16BIT);
 423         edma_set_src_index(link, 0, 0);
 424         edma_set_dest_index(link, 0, 0);
 425
 426         edma_read_slot(link, &prtd->asp_params);
 427         prtd->asp_params.opt &= ~(TCCMODE | EDMA_TCC(0x3f) | TCINTEN);
 428         prtd->asp_params.opt |= TCCHEN | EDMA_TCC(prtd->ram_channel & 0x3f);
 429         edma_write_slot(link, &prtd->asp_params);
 430
 431         /* pong */
 432         link = prtd->asp_link[1];
 433         edma_set_src(link, asp_src_ping, INCR, W16BIT);
 434         edma_set_dest(link, asp_dst_ping, INCR, W16BIT);
 435         edma_set_src_index(link, 0, 0);
 436         edma_set_dest_index(link, 0, 0);
 437
 438         edma_read_slot(link, &prtd->asp_params);
 439         prtd->asp_params.opt &= ~(TCCMODE | EDMA_TCC(0x3f));
 440         /* interrupt after every pong completion */
 441         prtd->asp_params.opt |= TCINTEN | TCCHEN |
 442                 EDMA_TCC(EDMA_CHAN_SLOT(prtd->ram_channel));
 443         edma_write_slot(link, &prtd->asp_params);
 444
 445         /* ram */
 446         link = prtd->ram_link;
 447         edma_set_src(link, iram_dma->addr, INCR, W32BIT);
 448         edma_set_dest(link, iram_dma->addr, INCR, W32BIT);
 449         pr_debug("%s: audio dma channels/slots in use for ram:%u %u %u,"
 450                 "for asp:%u %u %u\n", __func__,
 451                 prtd->ram_channel, prtd->ram_link, prtd->ram_link2,
 452                 prtd->asp_channel, prtd->asp_link[0],
 453                 prtd->asp_link[1]);
 454         return 0;
 455 exit4:
 456         edma_free_channel(prtd->asp_link[1]);
 457         prtd->asp_link[1] = -1;
 458 exit3:
 459         edma_free_channel(prtd->ram_link);
 460         prtd->ram_link = -1;
 461 exit2:
 462         edma_free_channel(prtd->ram_channel);
 463         prtd->ram_channel = -1;
 464 exit1:
 465         return link;
 466 }
 467
 468 static int davinci_pcm_dma_request(struct snd_pcm_substream *substream)
 469 {
 470         struct snd_dma_buffer *iram_dma;
 471         struct davinci_runtime_data *prtd = substream->runtime->private_data;
 472         struct davinci_pcm_dma_params *params = prtd->params;
 473         int link;
 474
 475         if (!params)
 476                 return -ENODEV;
 477
 478         /* Request asp master DMA channel */
 479         link = prtd->asp_channel = edma_alloc_channel(params->channel,
 480                         davinci_pcm_dma_irq, substream,
 481                         prtd->params->asp_chan_q);
 482         if (link < 0)
 483                 goto exit1;
 484
 485         /* Request asp link channels */
 486         link = prtd->asp_link[0] = edma_alloc_slot(
 487                         EDMA_CTLR(prtd->asp_channel), EDMA_SLOT_ANY);
 488         if (link < 0)
 489                 goto exit2;
 490
 491         iram_dma = (struct snd_dma_buffer *)substream->dma_buffer.private_data;
 492         if (iram_dma) {
 493                 if (request_ping_pong(substream, prtd, iram_dma) == 0)
 494                         return 0;
 495                 printk(KERN_WARNING "%s: dma channel allocation failed,"
 496                                 "not using sram\n", __func__);
 497         }
 498
 499         /* Issue transfer completion IRQ when the channel completes a
 500          * transfer, then always reload from the same slot (by a kind
 501          * of loopback link).  The completion IRQ handler will update
 502          * the reload slot with a new buffer.
 503          *
 504          * REVISIT save p_ram here after setting up everything except
 505          * the buffer and its length (ccnt) ... use it as a template
 506          * so davinci_pcm_enqueue_dma() takes less time in IRQ.
 507          */
 508         edma_read_slot(link, &prtd->asp_params);
 509         prtd->asp_params.opt |= TCINTEN |
 510                 EDMA_TCC(EDMA_CHAN_SLOT(prtd->asp_channel));
 511         prtd->asp_params.link_bcntrld = EDMA_CHAN_SLOT(link) << 5;
 512         edma_write_slot(link, &prtd->asp_params);
 513         return 0;
 514 exit2:
 515         edma_free_channel(prtd->asp_channel);
 516         prtd->asp_channel = -1;
 517 exit1:
 518         return link;
 519 }
 520
 521 static int davinci_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 522 {
 523         struct davinci_runtime_data *prtd = substream->runtime->private_data;
 524         int ret = 0;
 525
 526         spin_lock(&prtd->lock);
 527
 528         switch (cmd) {
 529         case SNDRV_PCM_TRIGGER_START:
 530         case SNDRV_PCM_TRIGGER_RESUME:
 531         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 532                 edma_resume(prtd->asp_channel);
 533                 break;
 534         case SNDRV_PCM_TRIGGER_STOP:
 535         case SNDRV_PCM_TRIGGER_SUSPEND:
 536         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 537                 edma_pause(prtd->asp_channel);
 538                 break;
 539         default:
 540                 ret = -EINVAL;
 541                 break;
 542         }
 543
 544         spin_unlock(&prtd->lock);
 545
 546         return ret;
 547 }
 548
 549 static int davinci_pcm_prepare(struct snd_pcm_substream *substream)
 550 {
 551         struct davinci_runtime_data *prtd = substream->runtime->private_data;
 552
 553         if (prtd->ram_channel >= 0) {
 554                 int ret = ping_pong_dma_setup(substream);
 555                 if (ret < 0)
 556                         return ret;
 557
 558                 edma_write_slot(prtd->ram_channel, &prtd->ram_params);
 559                 edma_write_slot(prtd->asp_channel, &prtd->asp_params);
 560
 561                 print_buf_info(prtd->ram_channel, "ram_channel");
 562                 print_buf_info(prtd->ram_link, "ram_link");
 563                 print_buf_info(prtd->ram_link2, "ram_link2");
 564                 print_buf_info(prtd->asp_channel, "asp_channel");
 565                 print_buf_info(prtd->asp_link[0], "asp_link[0]");
 566                 print_buf_info(prtd->asp_link[1], "asp_link[1]");
 567
 568                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 569                         /* copy 1st iram buffer */
 570                         edma_start(prtd->ram_channel);
 571                 }
 572                 edma_start(prtd->asp_channel);
 573                 return 0;
 574         }
 575         prtd->period = 0;
 576         davinci_pcm_enqueue_dma(substream);
 577
 578         /* Copy self-linked parameter RAM entry into master channel */
 579         edma_read_slot(prtd->asp_link[0], &prtd->asp_params);
 580         edma_write_slot(prtd->asp_channel, &prtd->asp_params);
 581         davinci_pcm_enqueue_dma(substream);
 582         edma_start(prtd->asp_channel);
 583
 584         return 0;
 585 }
 586
 587 static snd_pcm_uframes_t
 588 davinci_pcm_pointer(struct snd_pcm_substream *substream)
 589 {
 590         struct snd_pcm_runtime *runtime = substream->runtime;
 591         struct davinci_runtime_data *prtd = runtime->private_data;
 592         unsigned int offset;
 593         int asp_count;
 594         dma_addr_t asp_src, asp_dst;
 595
 596         spin_lock(&prtd->lock);
 597         if (prtd->ram_channel >= 0) {
 598                 int ram_count;
 599                 int mod_ram;
 600                 dma_addr_t ram_src, ram_dst;
 601                 unsigned int period_size = snd_pcm_lib_period_bytes(substream);
 602                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 603                         /* reading ram before asp should be safe
 604                          * as long as the asp transfers less than a ping size
 605                          * of bytes between the 2 reads
 606                          */
 607                         edma_get_position(prtd->ram_channel,
 608                                         &ram_src, &ram_dst);
 609                         edma_get_position(prtd->asp_channel,
 610                                         &asp_src, &asp_dst);
 611                         asp_count = asp_src - prtd->asp_params.src;
 612                         ram_count = ram_src - prtd->ram_params.src;
 613                         mod_ram = ram_count % period_size;
 614                         mod_ram -= asp_count;
 615                         if (mod_ram < 0)
 616                                 mod_ram += period_size;
 617                         else if (mod_ram == 0) {
 618                                 if (snd_pcm_running(substream))
 619                                         mod_ram += period_size;
 620                         }
 621                         ram_count -= mod_ram;
 622                         if (ram_count < 0)
 623                                 ram_count += period_size * runtime->periods;
 624                 } else {
 625                         edma_get_position(prtd->ram_channel,
 626                                         &ram_src, &ram_dst);
 627                         ram_count = ram_dst - prtd->ram_params.dst;
 628                 }
 629                 asp_count = ram_count;
 630         } else {
 631                 edma_get_position(prtd->asp_channel, &asp_src, &asp_dst);
 632                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 633                         asp_count = asp_src - runtime->dma_addr;
 634                 else
 635                         asp_count = asp_dst - runtime->dma_addr;
 636         }
 637         spin_unlock(&prtd->lock);
 638
 639         offset = bytes_to_frames(runtime, asp_count);
 640         if (offset >= runtime->buffer_size)
 641                 offset = 0;
 642
 643         return offset;
 644 }
 645
 646 static int davinci_pcm_open(struct snd_pcm_substream *substream)
 647 {
 648         struct snd_pcm_runtime *runtime = substream->runtime;
 649         struct davinci_runtime_data *prtd;
 650         struct snd_pcm_hardware *ppcm;
 651         int ret = 0;
 652         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 653         struct davinci_pcm_dma_params *pa;
 654         struct davinci_pcm_dma_params *params;
 655
 656         pa = snd_soc_dai_get_dma_data(rtd->dai->cpu_dai, substream);
 657         if (!pa)
 658                 return -ENODEV;
 659         params = &pa[substream->stream];
 660
 661         ppcm = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
 662                         &pcm_hardware_playback : &pcm_hardware_capture;
 663         allocate_sram(substream, params->sram_size, ppcm);
 664         snd_soc_set_runtime_hwparams(substream, ppcm);
 665         /* ensure that buffer size is a multiple of period size */
 666         ret = snd_pcm_hw_constraint_integer(runtime,
 667                                                 SNDRV_PCM_HW_PARAM_PERIODS);
 668         if (ret < 0)
 669                 return ret;
 670
 671         prtd = kzalloc(sizeof(struct davinci_runtime_data), GFP_KERNEL);
 672         if (prtd == NULL)
 673                 return -ENOMEM;
 674
 675         spin_lock_init(&prtd->lock);
 676         prtd->params = params;
 677         prtd->asp_channel = -1;
 678         prtd->asp_link[0] = prtd->asp_link[1] = -1;
 679         prtd->ram_channel = -1;
 680         prtd->ram_link = -1;
 681         prtd->ram_link2 = -1;
 682
 683         runtime->private_data = prtd;
 684
 685         ret = davinci_pcm_dma_request(substream);
 686         if (ret) {
 687                 printk(KERN_ERR "davinci_pcm: Failed to get dma channels\n");
 688                 kfree(prtd);
 689         }
 690
 691         return ret;
 692 }
 693
 694 static int davinci_pcm_close(struct snd_pcm_substream *substream)
 695 {
 696         struct snd_pcm_runtime *runtime = substream->runtime;
 697         struct davinci_runtime_data *prtd = runtime->private_data;
 698
 699         if (prtd->ram_channel >= 0)
 700                 edma_stop(prtd->ram_channel);
 701         if (prtd->asp_channel >= 0)
 702                 edma_stop(prtd->asp_channel);
 703         if (prtd->asp_link[0] >= 0)
 704                 edma_unlink(prtd->asp_link[0]);
 705         if (prtd->asp_link[1] >= 0)
 706                 edma_unlink(prtd->asp_link[1]);
 707         if (prtd->ram_link >= 0)
 708                 edma_unlink(prtd->ram_link);
 709
 710         if (prtd->asp_link[0] >= 0)
 711                 edma_free_slot(prtd->asp_link[0]);
 712         if (prtd->asp_link[1] >= 0)
 713                 edma_free_slot(prtd->asp_link[1]);
 714         if (prtd->asp_channel >= 0)
 715                 edma_free_channel(prtd->asp_channel);
 716         if (prtd->ram_link >= 0)
 717                 edma_free_slot(prtd->ram_link);
 718         if (prtd->ram_link2 >= 0)
 719                 edma_free_slot(prtd->ram_link2);
 720         if (prtd->ram_channel >= 0)
 721                 edma_free_channel(prtd->ram_channel);
 722
 723         kfree(prtd);
 724
 725         return 0;
 726 }
 727
 728 static int davinci_pcm_hw_params(struct snd_pcm_substream *substream,
 729                                  struct snd_pcm_hw_params *hw_params)
 730 {
 731         return snd_pcm_lib_malloc_pages(substream,
 732                                         params_buffer_bytes(hw_params));
 733 }
 734
 735 static int davinci_pcm_hw_free(struct snd_pcm_substream *substream)
 736 {
 737         return snd_pcm_lib_free_pages(substream);
 738 }
 739
 740 static int davinci_pcm_mmap(struct snd_pcm_substream *substream,
 741                             struct vm_area_struct *vma)
 742 {
 743         struct snd_pcm_runtime *runtime = substream->runtime;
 744
 745         return dma_mmap_writecombine(substream->pcm->card->dev, vma,
 746                                      runtime->dma_area,
 747                                      runtime->dma_addr,
 748                                      runtime->dma_bytes);
 749 }
 750
 751 static struct snd_pcm_ops davinci_pcm_ops = {
 752         .open =         davinci_pcm_open,
 753         .close =        davinci_pcm_close,
 754         .ioctl =        snd_pcm_lib_ioctl,
 755         .hw_params =    davinci_pcm_hw_params,
 756         .hw_free =      davinci_pcm_hw_free,
 757         .prepare =      davinci_pcm_prepare,
 758         .trigger =      davinci_pcm_trigger,
 759         .pointer =      davinci_pcm_pointer,
 760         .mmap =         davinci_pcm_mmap,
 761 };
 762
 763 static int davinci_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream,
 764                 size_t size)
 765 {
 766         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 767         struct snd_dma_buffer *buf = &substream->dma_buffer;
 768
 769         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 770         buf->dev.dev = pcm->card->dev;
 771         buf->private_data = NULL;
 772         buf->area = dma_alloc_writecombine(pcm->card->dev, size,
 773                                            &buf->addr, GFP_KERNEL);
 774
 775         pr_debug("davinci_pcm: preallocate_dma_buffer: area=%p, addr=%p, "
 776                 "size=%d\n", (void *) buf->area, (void *) buf->addr, size);
 777
 778         if (!buf->area)
 779                 return -ENOMEM;
 780
 781         buf->bytes = size;
 782         return 0;
 783 }
 784
 785 static void davinci_pcm_free(struct snd_pcm *pcm)
 786 {
 787         struct snd_pcm_substream *substream;
 788         struct snd_dma_buffer *buf;
 789         int stream;
 790
 791         for (stream = 0; stream < 2; stream++) {
 792                 struct snd_dma_buffer *iram_dma;
 793                 substream = pcm->streams[stream].substream;
 794                 if (!substream)
 795                         continue;
 796
 797                 buf = &substream->dma_buffer;
 798                 if (!buf->area)
 799                         continue;
 800
 801                 dma_free_writecombine(pcm->card->dev, buf->bytes,
 802                                       buf->area, buf->addr);
 803                 buf->area = NULL;
 804                 iram_dma = buf->private_data;
 805                 if (iram_dma) {
 806                         sram_free(iram_dma->area, iram_dma->bytes);
 807                         kfree(iram_dma);
 808                 }
 809         }
 810 }
 811
 812 static u64 davinci_pcm_dmamask = 0xffffffff;
 813
 814 static int davinci_pcm_new(struct snd_card *card,
 815                            struct snd_soc_dai *dai, struct snd_pcm *pcm)
 816 {
 817         int ret;
 818
 819         if (!card->dev->dma_mask)
 820                 card->dev->dma_mask = &davinci_pcm_dmamask;
 821         if (!card->dev->coherent_dma_mask)
 822                 card->dev->coherent_dma_mask = 0xffffffff;
 823
 824         if (dai->playback.channels_min) {
 825                 ret = davinci_pcm_preallocate_dma_buffer(pcm,
 826                         SNDRV_PCM_STREAM_PLAYBACK,
 827                         pcm_hardware_playback.buffer_bytes_max);
 828                 if (ret)
 829                         return ret;
 830         }
 831
 832         if (dai->capture.channels_min) {
 833                 ret = davinci_pcm_preallocate_dma_buffer(pcm,
 834                         SNDRV_PCM_STREAM_CAPTURE,
 835                         pcm_hardware_capture.buffer_bytes_max);
 836                 if (ret)
 837                         return ret;
 838         }
 839
 840         return 0;
 841 }
 842
 843 struct snd_soc_platform davinci_soc_platform = {
 844         .name =         "davinci-audio",
 845         .pcm_ops =      &davinci_pcm_ops,
 846         .pcm_new =      davinci_pcm_new,
 847         .pcm_free =     davinci_pcm_free,
 848 };
 849 EXPORT_SYMBOL_GPL(davinci_soc_platform);
 850
 851 static int __init davinci_soc_platform_init(void)
 852 {
 853         return snd_soc_register_platform(&davinci_soc_platform);
 854 }
 855 module_init(davinci_soc_platform_init);
 856
 857 static void __exit davinci_soc_platform_exit(void)
 858 {
 859         snd_soc_unregister_platform(&davinci_soc_platform);
 860 }
 861 module_exit(davinci_soc_platform_exit);
 862
 863 MODULE_AUTHOR("Vladimir Barinov");
 864 MODULE_DESCRIPTION("TI DAVINCI PCM DMA module");
 865 MODULE_LICENSE("GPL");