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/sram.h>
  27
  28 #include "davinci-pcm.h"
  29
  30 #ifdef DEBUG
  31 static void print_buf_info(int slot, char *name)
  32 {
  33         struct edmacc_param p;
  34         if (slot < 0)
  35                 return;
  36         edma_read_slot(slot, &p);
  37         printk(KERN_DEBUG "%s: 0x%x, opt=%x, src=%x, a_b_cnt=%x dst=%x\n",
  38                         name, slot, p.opt, p.src, p.a_b_cnt, p.dst);
  39         printk(KERN_DEBUG "    src_dst_bidx=%x link_bcntrld=%x src_dst_cidx=%x ccnt=%x\n",
  40                         p.src_dst_bidx, p.link_bcntrld, p.src_dst_cidx, p.ccnt);
  41 }
  42 #else
  43 static void print_buf_info(int slot, char *name)
  44 {
  45 }
  46 #endif
  47
  48 #define DAVINCI_PCM_FMTBITS     (\
  49                                 SNDRV_PCM_FMTBIT_S8     |\
  50                                 SNDRV_PCM_FMTBIT_U8     |\
  51                                 SNDRV_PCM_FMTBIT_S16_LE |\
  52                                 SNDRV_PCM_FMTBIT_S16_BE |\
  53                                 SNDRV_PCM_FMTBIT_U16_LE |\
  54                                 SNDRV_PCM_FMTBIT_U16_BE |\
  55                                 SNDRV_PCM_FMTBIT_S24_LE |\
  56                                 SNDRV_PCM_FMTBIT_S24_BE |\
  57                                 SNDRV_PCM_FMTBIT_U24_LE |\
  58                                 SNDRV_PCM_FMTBIT_U24_BE |\
  59                                 SNDRV_PCM_FMTBIT_S32_LE |\
  60                                 SNDRV_PCM_FMTBIT_S32_BE |\
  61                                 SNDRV_PCM_FMTBIT_U32_LE |\
  62                                 SNDRV_PCM_FMTBIT_U32_BE)
  63
  64 static struct snd_pcm_hardware pcm_hardware_playback = {
  65         .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
  66                  SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
  67                  SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME|
  68                  SNDRV_PCM_INFO_BATCH),
  69         .formats = DAVINCI_PCM_FMTBITS,
  70         .rates = (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 |
  71                   SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 |
  72                   SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 |
  73                   SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000 |
  74                   SNDRV_PCM_RATE_KNOT),
  75         .rate_min = 8000,
  76         .rate_max = 96000,
  77         .channels_min = 2,
  78         .channels_max = 384,
  79         .buffer_bytes_max = 128 * 1024,
  80         .period_bytes_min = 32,
  81         .period_bytes_max = 8 * 1024,
  82         .periods_min = 16,
  83         .periods_max = 255,
  84         .fifo_size = 0,
  85 };
  86
  87 static struct snd_pcm_hardware pcm_hardware_capture = {
  88         .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
  89                  SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
  90                  SNDRV_PCM_INFO_PAUSE |
  91                  SNDRV_PCM_INFO_BATCH),
  92         .formats = DAVINCI_PCM_FMTBITS,
  93         .rates = (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 |
  94                   SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 |
  95                   SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 |
  96                   SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000 |
  97                   SNDRV_PCM_RATE_KNOT),
  98         .rate_min = 8000,
  99         .rate_max = 96000,
 100         .channels_min = 2,
 101         .channels_max = 384,
 102         .buffer_bytes_max = 128 * 1024,
 103         .period_bytes_min = 32,
 104         .period_bytes_max = 8 * 1024,
 105         .periods_min = 16,
 106         .periods_max = 255,
 107         .fifo_size = 0,
 108 };
 109
 110 /*
 111  * How ping/pong works....
 112  *
 113  * Playback:
 114  * ram_params - copys 2*ping_size from start of SDRAM to iram,
 115  *      links to ram_link2
 116  * ram_link2 - copys rest of SDRAM to iram in ping_size units,
 117  *      links to ram_link
 118  * ram_link - copys entire SDRAM to iram in ping_size uints,
 119  *      links to self
 120  *
 121  * asp_params - same as asp_link[0]
 122  * asp_link[0] - copys from lower half of iram to asp port
 123  *      links to asp_link[1], triggers iram copy event on completion
 124  * asp_link[1] - copys from upper half of iram to asp port
 125  *      links to asp_link[0], triggers iram copy event on completion
 126  *      triggers interrupt only needed to let upper SOC levels update position
 127  *      in stream on completion
 128  *
 129  * When playback is started:
 130  *      ram_params started
 131  *      asp_params started
 132  *
 133  * Capture:
 134  * ram_params - same as ram_link,
 135  *      links to ram_link
 136  * ram_link - same as playback
 137  *      links to self
 138  *
 139  * asp_params - same as playback
 140  * asp_link[0] - same as playback
 141  * asp_link[1] - same as playback
 142  *
 143  * When capture is started:
 144  *      asp_params started
 145  */
 146 struct davinci_runtime_data {
 147         spinlock_t lock;
 148         int period;             /* current DMA period */
 149         int asp_channel;        /* Master DMA channel */
 150         int asp_link[2];        /* asp parameter link channel, ping/pong */
 151         struct davinci_pcm_dma_params *params;  /* DMA params */
 152         int ram_channel;
 153         int ram_link;
 154         int ram_link2;
 155         struct edmacc_param asp_params;
 156         struct edmacc_param ram_params;
 157 };
 158
 159 static void davinci_pcm_period_elapsed(struct snd_pcm_substream *substream)
 160 {
 161         struct davinci_runtime_data *prtd = substream->runtime->private_data;
 162         struct snd_pcm_runtime *runtime = substream->runtime;
 163
 164         prtd->period++;
 165         if (unlikely(prtd->period >= runtime->periods))
 166                 prtd->period = 0;
 167 }
 168
 169 static void davinci_pcm_period_reset(struct snd_pcm_substream *substream)
 170 {
 171         struct davinci_runtime_data *prtd = substream->runtime->private_data;
 172
 173         prtd->period = 0;
 174 }
 175 /*
 176  * Not used with ping/pong
 177  */
 178 static void davinci_pcm_enqueue_dma(struct snd_pcm_substream *substream)
 179 {
 180         struct davinci_runtime_data *prtd = substream->runtime->private_data;
 181         struct snd_pcm_runtime *runtime = substream->runtime;
 182         unsigned int period_size;
 183         unsigned int dma_offset;
 184         dma_addr_t dma_pos;
 185         dma_addr_t src, dst;
 186         unsigned short src_bidx, dst_bidx;
 187         unsigned short src_cidx, dst_cidx;
 188         unsigned int data_type;
 189         unsigned short acnt;
 190         unsigned int count;
 191         unsigned int fifo_level;
 192
 193         period_size = snd_pcm_lib_period_bytes(substream);
 194         dma_offset = prtd->period * period_size;
 195         dma_pos = runtime->dma_addr + dma_offset;
 196         fifo_level = prtd->params->fifo_level;
 197
 198         pr_debug("davinci_pcm: audio_set_dma_params_play channel = %d "
 199                 "dma_ptr = %x period_size=%x\n", prtd->asp_link[0], dma_pos,
 200                 period_size);
 201
 202         data_type = prtd->params->data_type;
 203         count = period_size / data_type;
 204         if (fifo_level)
 205                 count /= fifo_level;
 206
 207         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 208                 src = dma_pos;
 209                 dst = prtd->params->dma_addr;
 210                 src_bidx = data_type;
 211                 dst_bidx = 0;
 212                 src_cidx = data_type * fifo_level;
 213                 dst_cidx = 0;
 214         } else {
 215                 src = prtd->params->dma_addr;
 216                 dst = dma_pos;
 217                 src_bidx = 0;
 218                 dst_bidx = data_type;
 219                 src_cidx = 0;
 220                 dst_cidx = data_type * fifo_level;
 221         }
 222
 223         acnt = prtd->params->acnt;
 224         edma_set_src(prtd->asp_link[0], src, INCR, W8BIT);
 225         edma_set_dest(prtd->asp_link[0], dst, INCR, W8BIT);
 226
 227         edma_set_src_index(prtd->asp_link[0], src_bidx, src_cidx);
 228         edma_set_dest_index(prtd->asp_link[0], dst_bidx, dst_cidx);
 229
 230         if (!fifo_level)
 231                 edma_set_transfer_params(prtd->asp_link[0], acnt, count, 1, 0,
 232                                                         ASYNC);
 233         else
 234                 edma_set_transfer_params(prtd->asp_link[0], acnt, fifo_level,
 235                                                         count, fifo_level,
 236                                                         ABSYNC);
 237 }
 238
 239 static void davinci_pcm_dma_irq(unsigned link, u16 ch_status, void *data)
 240 {
 241         struct snd_pcm_substream *substream = data;
 242         struct davinci_runtime_data *prtd = substream->runtime->private_data;
 243
 244         print_buf_info(prtd->ram_channel, "i ram_channel");
 245         pr_debug("davinci_pcm: link=%d, status=0x%x\n", link, ch_status);
 246
 247         if (unlikely(ch_status != DMA_COMPLETE))
 248                 return;
 249
 250         if (snd_pcm_running(substream)) {
 251                 spin_lock(&prtd->lock);
 252                 if (prtd->ram_channel < 0) {
 253                         /* No ping/pong must fix up link dma data*/
 254                         davinci_pcm_enqueue_dma(substream);
 255                 }
 256                 davinci_pcm_period_elapsed(substream);
 257                 spin_unlock(&prtd->lock);
 258                 snd_pcm_period_elapsed(substream);
 259         }
 260 }
 261
 262 static int allocate_sram(struct snd_pcm_substream *substream, unsigned size,
 263                 struct snd_pcm_hardware *ppcm)
 264 {
 265         struct snd_dma_buffer *buf = &substream->dma_buffer;
 266         struct snd_dma_buffer *iram_dma = NULL;
 267         dma_addr_t iram_phys = 0;
 268         void *iram_virt = NULL;
 269
 270         if (buf->private_data || !size)
 271                 return 0;
 272
 273         ppcm->period_bytes_max = size;
 274         iram_virt = sram_alloc(size, &iram_phys);
 275         if (!iram_virt)
 276                 goto exit1;
 277         iram_dma = kzalloc(sizeof(*iram_dma), GFP_KERNEL);
 278         if (!iram_dma)
 279                 goto exit2;
 280         iram_dma->area = iram_virt;
 281         iram_dma->addr = iram_phys;
 282         memset(iram_dma->area, 0, size);
 283         iram_dma->bytes = size;
 284         buf->private_data = iram_dma;
 285         return 0;
 286 exit2:
 287         if (iram_virt)
 288                 sram_free(iram_virt, size);
 289 exit1:
 290         return -ENOMEM;
 291 }
 292
 293 /*
 294  * Only used with ping/pong.
 295  * This is called after runtime->dma_addr, period_bytes and data_type are valid
 296  */
 297 static int ping_pong_dma_setup(struct snd_pcm_substream *substream)
 298 {
 299         unsigned short ram_src_cidx, ram_dst_cidx;
 300         struct snd_pcm_runtime *runtime = substream->runtime;
 301         struct davinci_runtime_data *prtd = runtime->private_data;
 302         struct snd_dma_buffer *iram_dma =
 303                 (struct snd_dma_buffer *)substream->dma_buffer.private_data;
 304         struct davinci_pcm_dma_params *params = prtd->params;
 305         unsigned int data_type = params->data_type;
 306         unsigned int acnt = params->acnt;
 307         /* divide by 2 for ping/pong */
 308         unsigned int ping_size = snd_pcm_lib_period_bytes(substream) >> 1;
 309         unsigned int fifo_level = prtd->params->fifo_level;
 310         unsigned int count;
 311         if ((data_type == 0) || (data_type > 4)) {
 312                 printk(KERN_ERR "%s: data_type=%i\n", __func__, data_type);
 313                 return -EINVAL;
 314         }
 315         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 316                 dma_addr_t asp_src_pong = iram_dma->addr + ping_size;
 317                 ram_src_cidx = ping_size;
 318                 ram_dst_cidx = -ping_size;
 319                 edma_set_src(prtd->asp_link[1], asp_src_pong, INCR, W8BIT);
 320
 321                 edma_set_src_index(prtd->asp_link[0], data_type,
 322                                 data_type * fifo_level);
 323                 edma_set_src_index(prtd->asp_link[1], data_type,
 324                                 data_type * fifo_level);
 325
 326                 edma_set_src(prtd->ram_link, runtime->dma_addr, INCR, W32BIT);
 327         } else {
 328                 dma_addr_t asp_dst_pong = iram_dma->addr + ping_size;
 329                 ram_src_cidx = -ping_size;
 330                 ram_dst_cidx = ping_size;
 331                 edma_set_dest(prtd->asp_link[1], asp_dst_pong, INCR, W8BIT);
 332
 333                 edma_set_dest_index(prtd->asp_link[0], data_type,
 334                                 data_type * fifo_level);
 335                 edma_set_dest_index(prtd->asp_link[1], data_type,
 336                                 data_type * fifo_level);
 337
 338                 edma_set_dest(prtd->ram_link, runtime->dma_addr, INCR, W32BIT);
 339         }
 340
 341         if (!fifo_level) {
 342                 count = ping_size / data_type;
 343                 edma_set_transfer_params(prtd->asp_link[0], acnt, count,
 344                                 1, 0, ASYNC);
 345                 edma_set_transfer_params(prtd->asp_link[1], acnt, count,
 346                                 1, 0, ASYNC);
 347         } else {
 348                 count = ping_size / (data_type * fifo_level);
 349                 edma_set_transfer_params(prtd->asp_link[0], acnt, fifo_level,
 350                                 count, fifo_level, ABSYNC);
 351                 edma_set_transfer_params(prtd->asp_link[1], acnt, fifo_level,
 352                                 count, fifo_level, ABSYNC);
 353         }
 354
 355         edma_set_src_index(prtd->ram_link, ping_size, ram_src_cidx);
 356         edma_set_dest_index(prtd->ram_link, ping_size, ram_dst_cidx);
 357         edma_set_transfer_params(prtd->ram_link, ping_size, 2,
 358                         runtime->periods, 2, ASYNC);
 359
 360         /* init master params */
 361         edma_read_slot(prtd->asp_link[0], &prtd->asp_params);
 362         edma_read_slot(prtd->ram_link, &prtd->ram_params);
 363         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 364                 struct edmacc_param p_ram;
 365                 /* Copy entire iram buffer before playback started */
 366                 prtd->ram_params.a_b_cnt = (1 << 16) | (ping_size << 1);
 367                 /* 0 dst_bidx */
 368                 prtd->ram_params.src_dst_bidx = (ping_size << 1);
 369                 /* 0 dst_cidx */
 370                 prtd->ram_params.src_dst_cidx = (ping_size << 1);
 371                 prtd->ram_params.ccnt = 1;
 372
 373                 /* Skip 1st period */
 374                 edma_read_slot(prtd->ram_link, &p_ram);
 375                 p_ram.src += (ping_size << 1);
 376                 p_ram.ccnt -= 1;
 377                 edma_write_slot(prtd->ram_link2, &p_ram);
 378                 /*
 379                  * When 1st started, ram -> iram dma channel will fill the
 380                  * entire iram.  Then, whenever a ping/pong asp buffer finishes,
 381                  * 1/2 iram will be filled.
 382                  */
 383                 prtd->ram_params.link_bcntrld =
 384                         EDMA_CHAN_SLOT(prtd->ram_link2) << 5;
 385         }
 386         return 0;
 387 }
 388
 389 /* 1 asp tx or rx channel using 2 parameter channels
 390  * 1 ram to/from iram channel using 1 parameter channel
 391  *
 392  * Playback
 393  * ram copy channel kicks off first,
 394  * 1st ram copy of entire iram buffer completion kicks off asp channel
 395  * asp tcc always kicks off ram copy of 1/2 iram buffer
 396  *
 397  * Record
 398  * asp channel starts, tcc kicks off ram copy
 399  */
 400 static int request_ping_pong(struct snd_pcm_substream *substream,
 401                 struct davinci_runtime_data *prtd,
 402                 struct snd_dma_buffer *iram_dma)
 403 {
 404         dma_addr_t asp_src_ping;
 405         dma_addr_t asp_dst_ping;
 406         int ret;
 407         struct davinci_pcm_dma_params *params = prtd->params;
 408
 409         /* Request ram master channel */
 410         ret = prtd->ram_channel = edma_alloc_channel(EDMA_CHANNEL_ANY,
 411                                   davinci_pcm_dma_irq, substream,
 412                                   prtd->params->ram_chan_q);
 413         if (ret < 0)
 414                 goto exit1;
 415
 416         /* Request ram link channel */
 417         ret = prtd->ram_link = edma_alloc_slot(
 418                         EDMA_CTLR(prtd->ram_channel), EDMA_SLOT_ANY);
 419         if (ret < 0)
 420                 goto exit2;
 421
 422         ret = prtd->asp_link[1] = edma_alloc_slot(
 423                         EDMA_CTLR(prtd->asp_channel), EDMA_SLOT_ANY);
 424         if (ret < 0)
 425                 goto exit3;
 426
 427         prtd->ram_link2 = -1;
 428         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 429                 ret = prtd->ram_link2 = edma_alloc_slot(
 430                         EDMA_CTLR(prtd->ram_channel), EDMA_SLOT_ANY);
 431                 if (ret < 0)
 432                         goto exit4;
 433         }
 434         /* circle ping-pong buffers */
 435         edma_link(prtd->asp_link[0], prtd->asp_link[1]);
 436         edma_link(prtd->asp_link[1], prtd->asp_link[0]);
 437         /* circle ram buffers */
 438         edma_link(prtd->ram_link, prtd->ram_link);
 439
 440         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 441                 asp_src_ping = iram_dma->addr;
 442                 asp_dst_ping = params->dma_addr;        /* fifo */
 443         } else {
 444                 asp_src_ping = params->dma_addr;        /* fifo */
 445                 asp_dst_ping = iram_dma->addr;
 446         }
 447         /* ping */
 448         edma_set_src(prtd->asp_link[0], asp_src_ping, INCR, W16BIT);
 449         edma_set_dest(prtd->asp_link[0], asp_dst_ping, INCR, W16BIT);
 450         edma_set_src_index(prtd->asp_link[0], 0, 0);
 451         edma_set_dest_index(prtd->asp_link[0], 0, 0);
 452
 453         edma_read_slot(prtd->asp_link[0], &prtd->asp_params);
 454         prtd->asp_params.opt &= ~(TCCMODE | EDMA_TCC(0x3f) | TCINTEN);
 455         prtd->asp_params.opt |= TCCHEN |
 456                 EDMA_TCC(prtd->ram_channel & 0x3f);
 457         edma_write_slot(prtd->asp_link[0], &prtd->asp_params);
 458
 459         /* pong */
 460         edma_set_src(prtd->asp_link[1], asp_src_ping, INCR, W16BIT);
 461         edma_set_dest(prtd->asp_link[1], asp_dst_ping, INCR, W16BIT);
 462         edma_set_src_index(prtd->asp_link[1], 0, 0);
 463         edma_set_dest_index(prtd->asp_link[1], 0, 0);
 464
 465         edma_read_slot(prtd->asp_link[1], &prtd->asp_params);
 466         prtd->asp_params.opt &= ~(TCCMODE | EDMA_TCC(0x3f));
 467         /* interrupt after every pong completion */
 468         prtd->asp_params.opt |= TCINTEN | TCCHEN |
 469                 EDMA_TCC(prtd->ram_channel & 0x3f);
 470         edma_write_slot(prtd->asp_link[1], &prtd->asp_params);
 471
 472         /* ram */
 473         edma_set_src(prtd->ram_link, iram_dma->addr, INCR, W32BIT);
 474         edma_set_dest(prtd->ram_link, iram_dma->addr, INCR, W32BIT);
 475         pr_debug("%s: audio dma channels/slots in use for ram:%u %u %u,"
 476                 "for asp:%u %u %u\n", __func__,
 477                 prtd->ram_channel, prtd->ram_link, prtd->ram_link2,
 478                 prtd->asp_channel, prtd->asp_link[0],
 479                 prtd->asp_link[1]);
 480         return 0;
 481 exit4:
 482         edma_free_channel(prtd->asp_link[1]);
 483         prtd->asp_link[1] = -1;
 484 exit3:
 485         edma_free_channel(prtd->ram_link);
 486         prtd->ram_link = -1;
 487 exit2:
 488         edma_free_channel(prtd->ram_channel);
 489         prtd->ram_channel = -1;
 490 exit1:
 491         return ret;
 492 }
 493
 494 static int davinci_pcm_dma_request(struct snd_pcm_substream *substream)
 495 {
 496         struct snd_dma_buffer *iram_dma;
 497         struct davinci_runtime_data *prtd = substream->runtime->private_data;
 498         struct davinci_pcm_dma_params *params = prtd->params;
 499         int ret;
 500
 501         if (!params)
 502                 return -ENODEV;
 503
 504         /* Request asp master DMA channel */
 505         ret = prtd->asp_channel = edma_alloc_channel(params->channel,
 506                         davinci_pcm_dma_irq, substream,
 507                         prtd->params->asp_chan_q);
 508         if (ret < 0)
 509                 goto exit1;
 510
 511         /* Request asp link channels */
 512         ret = prtd->asp_link[0] = edma_alloc_slot(
 513                         EDMA_CTLR(prtd->asp_channel), EDMA_SLOT_ANY);
 514         if (ret < 0)
 515                 goto exit2;
 516
 517         iram_dma = (struct snd_dma_buffer *)substream->dma_buffer.private_data;
 518         if (iram_dma) {
 519                 if (request_ping_pong(substream, prtd, iram_dma) == 0)
 520                         return 0;
 521                 printk(KERN_WARNING "%s: dma channel allocation failed,"
 522                                 "not using sram\n", __func__);
 523         }
 524
 525         /* Issue transfer completion IRQ when the channel completes a
 526          * transfer, then always reload from the same slot (by a kind
 527          * of loopback link).  The completion IRQ handler will update
 528          * the reload slot with a new buffer.
 529          *
 530          * REVISIT save p_ram here after setting up everything except
 531          * the buffer and its length (ccnt) ... use it as a template
 532          * so davinci_pcm_enqueue_dma() takes less time in IRQ.
 533          */
 534         edma_read_slot(prtd->asp_link[0], &prtd->asp_params);
 535         prtd->asp_params.opt |= TCINTEN |
 536                 EDMA_TCC(EDMA_CHAN_SLOT(prtd->asp_channel));
 537         prtd->asp_params.link_bcntrld = EDMA_CHAN_SLOT(prtd->asp_link[0]) << 5;
 538         edma_write_slot(prtd->asp_link[0], &prtd->asp_params);
 539         return 0;
 540 exit2:
 541         edma_free_channel(prtd->asp_channel);
 542         prtd->asp_channel = -1;
 543 exit1:
 544         return ret;
 545 }
 546
 547 static int davinci_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 548 {
 549         struct davinci_runtime_data *prtd = substream->runtime->private_data;
 550         int ret = 0;
 551
 552         spin_lock(&prtd->lock);
 553
 554         switch (cmd) {
 555         case SNDRV_PCM_TRIGGER_START:
 556                 edma_start(prtd->asp_channel);
 557                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 558                     prtd->ram_channel >= 0) {
 559                         /* copy 1st iram buffer */
 560                         edma_start(prtd->ram_channel);
 561                 }
 562                 break;
 563         case SNDRV_PCM_TRIGGER_RESUME:
 564         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 565                 edma_resume(prtd->asp_channel);
 566                 break;
 567         case SNDRV_PCM_TRIGGER_STOP:
 568         case SNDRV_PCM_TRIGGER_SUSPEND:
 569         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 570                 edma_pause(prtd->asp_channel);
 571                 break;
 572         default:
 573                 ret = -EINVAL;
 574                 break;
 575         }
 576
 577         spin_unlock(&prtd->lock);
 578
 579         return ret;
 580 }
 581
 582 static int davinci_pcm_prepare(struct snd_pcm_substream *substream)
 583 {
 584         struct davinci_runtime_data *prtd = substream->runtime->private_data;
 585
 586         davinci_pcm_period_reset(substream);
 587         if (prtd->ram_channel >= 0) {
 588                 int ret = ping_pong_dma_setup(substream);
 589                 if (ret < 0)
 590                         return ret;
 591
 592                 edma_write_slot(prtd->ram_channel, &prtd->ram_params);
 593                 edma_write_slot(prtd->asp_channel, &prtd->asp_params);
 594
 595                 print_buf_info(prtd->ram_channel, "ram_channel");
 596                 print_buf_info(prtd->ram_link, "ram_link");
 597                 print_buf_info(prtd->ram_link2, "ram_link2");
 598                 print_buf_info(prtd->asp_channel, "asp_channel");
 599                 print_buf_info(prtd->asp_link[0], "asp_link[0]");
 600                 print_buf_info(prtd->asp_link[1], "asp_link[1]");
 601
 602                 /*
 603                  * There is a phase offset of 2 periods between the position
 604                  * used by dma setup and the position reported in the pointer
 605                  * function.
 606                  *
 607                  * The phase offset, when not using ping-pong buffers, is due to
 608                  * the two consecutive calls to davinci_pcm_enqueue_dma() below.
 609                  *
 610                  * Whereas here, with ping-pong buffers, the phase is due to
 611                  * there being an entire buffer transfer complete before the
 612                  * first dma completion event triggers davinci_pcm_dma_irq().
 613                  */
 614                 davinci_pcm_period_elapsed(substream);
 615                 davinci_pcm_period_elapsed(substream);
 616
 617                 return 0;
 618         }
 619         davinci_pcm_enqueue_dma(substream);
 620         davinci_pcm_period_elapsed(substream);
 621
 622         /* Copy self-linked parameter RAM entry into master channel */
 623         edma_read_slot(prtd->asp_link[0], &prtd->asp_params);
 624         edma_write_slot(prtd->asp_channel, &prtd->asp_params);
 625         davinci_pcm_enqueue_dma(substream);
 626         davinci_pcm_period_elapsed(substream);
 627
 628         return 0;
 629 }
 630
 631 static snd_pcm_uframes_t
 632 davinci_pcm_pointer(struct snd_pcm_substream *substream)
 633 {
 634         struct snd_pcm_runtime *runtime = substream->runtime;
 635         struct davinci_runtime_data *prtd = runtime->private_data;
 636         unsigned int offset;
 637         int asp_count;
 638         unsigned int period_size = snd_pcm_lib_period_bytes(substream);
 639
 640         /*
 641          * There is a phase offset of 2 periods between the position used by dma
 642          * setup and the position reported in the pointer function. Either +2 in
 643          * the dma setup or -2 here in the pointer function (with wrapping,
 644          * both) accounts for this offset -- choose the latter since it makes
 645          * the first-time setup clearer.
 646          */
 647         spin_lock(&prtd->lock);
 648         asp_count = prtd->period - 2;
 649         spin_unlock(&prtd->lock);
 650
 651         if (asp_count < 0)
 652                 asp_count += runtime->periods;
 653         asp_count *= period_size;
 654
 655         offset = bytes_to_frames(runtime, asp_count);
 656         if (offset >= runtime->buffer_size)
 657                 offset = 0;
 658
 659         return offset;
 660 }
 661
 662 static int davinci_pcm_open(struct snd_pcm_substream *substream)
 663 {
 664         struct snd_pcm_runtime *runtime = substream->runtime;
 665         struct davinci_runtime_data *prtd;
 666         struct snd_pcm_hardware *ppcm;
 667         int ret = 0;
 668         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 669         struct davinci_pcm_dma_params *pa;
 670         struct davinci_pcm_dma_params *params;
 671
 672         pa = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 673         if (!pa)
 674                 return -ENODEV;
 675         params = &pa[substream->stream];
 676
 677         ppcm = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
 678                         &pcm_hardware_playback : &pcm_hardware_capture;
 679         allocate_sram(substream, params->sram_size, ppcm);
 680         snd_soc_set_runtime_hwparams(substream, ppcm);
 681         /* ensure that buffer size is a multiple of period size */
 682         ret = snd_pcm_hw_constraint_integer(runtime,
 683                                                 SNDRV_PCM_HW_PARAM_PERIODS);
 684         if (ret < 0)
 685                 return ret;
 686
 687         prtd = kzalloc(sizeof(struct davinci_runtime_data), GFP_KERNEL);
 688         if (prtd == NULL)
 689                 return -ENOMEM;
 690
 691         spin_lock_init(&prtd->lock);
 692         prtd->params = params;
 693         prtd->asp_channel = -1;
 694         prtd->asp_link[0] = prtd->asp_link[1] = -1;
 695         prtd->ram_channel = -1;
 696         prtd->ram_link = -1;
 697         prtd->ram_link2 = -1;
 698
 699         runtime->private_data = prtd;
 700
 701         ret = davinci_pcm_dma_request(substream);
 702         if (ret) {
 703                 printk(KERN_ERR "davinci_pcm: Failed to get dma channels\n");
 704                 kfree(prtd);
 705         }
 706
 707         return ret;
 708 }
 709
 710 static int davinci_pcm_close(struct snd_pcm_substream *substream)
 711 {
 712         struct snd_pcm_runtime *runtime = substream->runtime;
 713         struct davinci_runtime_data *prtd = runtime->private_data;
 714
 715         if (prtd->ram_channel >= 0)
 716                 edma_stop(prtd->ram_channel);
 717         if (prtd->asp_channel >= 0)
 718                 edma_stop(prtd->asp_channel);
 719         if (prtd->asp_link[0] >= 0)
 720                 edma_unlink(prtd->asp_link[0]);
 721         if (prtd->asp_link[1] >= 0)
 722                 edma_unlink(prtd->asp_link[1]);
 723         if (prtd->ram_link >= 0)
 724                 edma_unlink(prtd->ram_link);
 725
 726         if (prtd->asp_link[0] >= 0)
 727                 edma_free_slot(prtd->asp_link[0]);
 728         if (prtd->asp_link[1] >= 0)
 729                 edma_free_slot(prtd->asp_link[1]);
 730         if (prtd->asp_channel >= 0)
 731                 edma_free_channel(prtd->asp_channel);
 732         if (prtd->ram_link >= 0)
 733                 edma_free_slot(prtd->ram_link);
 734         if (prtd->ram_link2 >= 0)
 735                 edma_free_slot(prtd->ram_link2);
 736         if (prtd->ram_channel >= 0)
 737                 edma_free_channel(prtd->ram_channel);
 738
 739         kfree(prtd);
 740
 741         return 0;
 742 }
 743
 744 static int davinci_pcm_hw_params(struct snd_pcm_substream *substream,
 745                                  struct snd_pcm_hw_params *hw_params)
 746 {
 747         return snd_pcm_lib_malloc_pages(substream,
 748                                         params_buffer_bytes(hw_params));
 749 }
 750
 751 static int davinci_pcm_hw_free(struct snd_pcm_substream *substream)
 752 {
 753         return snd_pcm_lib_free_pages(substream);
 754 }
 755
 756 static int davinci_pcm_mmap(struct snd_pcm_substream *substream,
 757                             struct vm_area_struct *vma)
 758 {
 759         struct snd_pcm_runtime *runtime = substream->runtime;
 760
 761         return dma_mmap_writecombine(substream->pcm->card->dev, vma,
 762                                      runtime->dma_area,
 763                                      runtime->dma_addr,
 764                                      runtime->dma_bytes);
 765 }
 766
 767 static struct snd_pcm_ops davinci_pcm_ops = {
 768         .open =         davinci_pcm_open,
 769         .close =        davinci_pcm_close,
 770         .ioctl =        snd_pcm_lib_ioctl,
 771         .hw_params =    davinci_pcm_hw_params,
 772         .hw_free =      davinci_pcm_hw_free,
 773         .prepare =      davinci_pcm_prepare,
 774         .trigger =      davinci_pcm_trigger,
 775         .pointer =      davinci_pcm_pointer,
 776         .mmap =         davinci_pcm_mmap,
 777 };
 778
 779 static int davinci_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream,
 780                 size_t size)
 781 {
 782         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 783         struct snd_dma_buffer *buf = &substream->dma_buffer;
 784
 785         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 786         buf->dev.dev = pcm->card->dev;
 787         buf->private_data = NULL;
 788         buf->area = dma_alloc_writecombine(pcm->card->dev, size,
 789                                            &buf->addr, GFP_KERNEL);
 790
 791         pr_debug("davinci_pcm: preallocate_dma_buffer: area=%p, addr=%p, "
 792                 "size=%d\n", (void *) buf->area, (void *) buf->addr, size);
 793
 794         if (!buf->area)
 795                 return -ENOMEM;
 796
 797         buf->bytes = size;
 798         return 0;
 799 }
 800
 801 static void davinci_pcm_free(struct snd_pcm *pcm)
 802 {
 803         struct snd_pcm_substream *substream;
 804         struct snd_dma_buffer *buf;
 805         int stream;
 806
 807         for (stream = 0; stream < 2; stream++) {
 808                 struct snd_dma_buffer *iram_dma;
 809                 substream = pcm->streams[stream].substream;
 810                 if (!substream)
 811                         continue;
 812
 813                 buf = &substream->dma_buffer;
 814                 if (!buf->area)
 815                         continue;
 816
 817                 dma_free_writecombine(pcm->card->dev, buf->bytes,
 818                                       buf->area, buf->addr);
 819                 buf->area = NULL;
 820                 iram_dma = buf->private_data;
 821                 if (iram_dma) {
 822                         sram_free(iram_dma->area, iram_dma->bytes);
 823                         kfree(iram_dma);
 824                 }
 825         }
 826 }
 827
 828 static u64 davinci_pcm_dmamask = DMA_BIT_MASK(32);
 829
 830 static int davinci_pcm_new(struct snd_soc_pcm_runtime *rtd)
 831 {
 832         struct snd_card *card = rtd->card->snd_card;
 833         struct snd_pcm *pcm = rtd->pcm;
 834         int ret;
 835
 836         if (!card->dev->dma_mask)
 837                 card->dev->dma_mask = &davinci_pcm_dmamask;
 838         if (!card->dev->coherent_dma_mask)
 839                 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
 840
 841         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
 842                 ret = davinci_pcm_preallocate_dma_buffer(pcm,
 843                         SNDRV_PCM_STREAM_PLAYBACK,
 844                         pcm_hardware_playback.buffer_bytes_max);
 845                 if (ret)
 846                         return ret;
 847         }
 848
 849         if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
 850                 ret = davinci_pcm_preallocate_dma_buffer(pcm,
 851                         SNDRV_PCM_STREAM_CAPTURE,
 852                         pcm_hardware_capture.buffer_bytes_max);
 853                 if (ret)
 854                         return ret;
 855         }
 856
 857         return 0;
 858 }
 859
 860 static struct snd_soc_platform_driver davinci_soc_platform = {
 861         .ops =          &davinci_pcm_ops,
 862         .pcm_new =      davinci_pcm_new,
 863         .pcm_free =     davinci_pcm_free,
 864 };
 865
 866 int davinci_soc_platform_register(struct device *dev)
 867 {
 868         return snd_soc_register_platform(dev, &davinci_soc_platform);
 869 }
 870 EXPORT_SYMBOL_GPL(davinci_soc_platform_register);
 871
 872 void davinci_soc_platform_unregister(struct device *dev)
 873 {
 874         snd_soc_unregister_platform(dev);
 875 }
 876 EXPORT_SYMBOL_GPL(davinci_soc_platform_unregister);
 877
 878 MODULE_AUTHOR("Vladimir Barinov");
 879 MODULE_DESCRIPTION("TI DAVINCI PCM DMA module");
 880 MODULE_LICENSE("GPL");