sound/soc/davinci/davinci-pcm.c

   1 /*
   2  * ALSA PCM interface for the TI DAVINCI processor
   3  *
   4  * Author:      Vladimir Barinov, <vbarinov@embeddedalley.com>
   5  * Copyright:   (C) 2007 MontaVista Software, Inc., <source@mvista.com>
   6  * added SRAM ping/pong (C) 2008 Troy Kisky <troy.kisky@boundarydevices.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/init.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/slab.h>
  17 #include <linux/dma-mapping.h>
  18 #include <linux/kernel.h>
  19
  20 #include <sound/core.h>
  21 #include <sound/pcm.h>
  22 #include <sound/pcm_params.h>
  23 #include <sound/soc.h>
  24
  25 #include <asm/dma.h>
  26 #include <mach/edma.h>
  27 #include <mach/sram.h>
  28
  29 #include "davinci-pcm.h"
  30
  31 #ifdef DEBUG
  32 static void print_buf_info(int slot, char *name)
  33 {
  34         struct edmacc_param p;
  35         if (slot < 0)
  36                 return;
  37         edma_read_slot(slot, &p);
  38         printk(KERN_DEBUG "%s: 0x%x, opt=%x, src=%x, a_b_cnt=%x dst=%x\n",
  39                         name, slot, p.opt, p.src, p.a_b_cnt, p.dst);
  40         printk(KERN_DEBUG "    src_dst_bidx=%x link_bcntrld=%x src_dst_cidx=%x ccnt=%x\n",
  41                         p.src_dst_bidx, p.link_bcntrld, p.src_dst_cidx, p.ccnt);
  42 }
  43 #else
  44 static void print_buf_info(int slot, char *name)
  45 {
  46 }
  47 #endif
  48
  49 #define DAVINCI_PCM_FMTBITS     (\
  50                                 SNDRV_PCM_FMTBIT_S8     |\
  51                                 SNDRV_PCM_FMTBIT_U8     |\
  52                                 SNDRV_PCM_FMTBIT_S16_LE |\
  53                                 SNDRV_PCM_FMTBIT_S16_BE |\
  54                                 SNDRV_PCM_FMTBIT_U16_LE |\
  55                                 SNDRV_PCM_FMTBIT_U16_BE |\
  56                                 SNDRV_PCM_FMTBIT_S24_LE |\
  57                                 SNDRV_PCM_FMTBIT_S24_BE |\
  58                                 SNDRV_PCM_FMTBIT_U24_LE |\
  59                                 SNDRV_PCM_FMTBIT_U24_BE |\
  60                                 SNDRV_PCM_FMTBIT_S32_LE |\
  61                                 SNDRV_PCM_FMTBIT_S32_BE |\
  62                                 SNDRV_PCM_FMTBIT_U32_LE |\
  63                                 SNDRV_PCM_FMTBIT_U32_BE)
  64
  65 static struct snd_pcm_hardware pcm_hardware_playback = {
  66         .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
  67                  SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
  68                  SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME|
  69                  SNDRV_PCM_INFO_BATCH),
  70         .formats = DAVINCI_PCM_FMTBITS,
  71         .rates = (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 |
  72                   SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 |
  73                   SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 |
  74                   SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000 |
  75                   SNDRV_PCM_RATE_KNOT),
  76         .rate_min = 8000,
  77         .rate_max = 96000,
  78         .channels_min = 2,
  79         .channels_max = 384,
  80         .buffer_bytes_max = 128 * 1024,
  81         .period_bytes_min = 32,
  82         .period_bytes_max = 8 * 1024,
  83         .periods_min = 16,
  84         .periods_max = 255,
  85         .fifo_size = 0,
  86 };
  87
  88 static struct snd_pcm_hardware pcm_hardware_capture = {
  89         .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
  90                  SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
  91                  SNDRV_PCM_INFO_PAUSE |
  92                  SNDRV_PCM_INFO_BATCH),
  93         .formats = DAVINCI_PCM_FMTBITS,
  94         .rates = (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 |
  95                   SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 |
  96                   SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 |
  97                   SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000 |
  98                   SNDRV_PCM_RATE_KNOT),
  99         .rate_min = 8000,
 100         .rate_max = 96000,
 101         .channels_min = 2,
 102         .channels_max = 384,
 103         .buffer_bytes_max = 128 * 1024,
 104         .period_bytes_min = 32,
 105         .period_bytes_max = 8 * 1024,
 106         .periods_min = 16,
 107         .periods_max = 255,
 108         .fifo_size = 0,
 109 };
 110
 111 /*
 112  * How ping/pong works....
 113  *
 114  * Playback:
 115  * ram_params - copys 2*ping_size from start of SDRAM to iram,
 116  *      links to ram_link2
 117  * ram_link2 - copys rest of SDRAM to iram in ping_size units,
 118  *      links to ram_link
 119  * ram_link - copys entire SDRAM to iram in ping_size uints,
 120  *      links to self
 121  *
 122  * asp_params - same as asp_link[0]
 123  * asp_link[0] - copys from lower half of iram to asp port
 124  *      links to asp_link[1], triggers iram copy event on completion
 125  * asp_link[1] - copys from upper half of iram to asp port
 126  *      links to asp_link[0], triggers iram copy event on completion
 127  *      triggers interrupt only needed to let upper SOC levels update position
 128  *      in stream on completion
 129  *
 130  * When playback is started:
 131  *      ram_params started
 132  *      asp_params started
 133  *
 134  * Capture:
 135  * ram_params - same as ram_link,
 136  *      links to ram_link
 137  * ram_link - same as playback
 138  *      links to self
 139  *
 140  * asp_params - same as playback
 141  * asp_link[0] - same as playback
 142  * asp_link[1] - same as playback
 143  *
 144  * When capture is started:
 145  *      asp_params started
 146  */
 147 struct davinci_runtime_data {
 148         spinlock_t lock;
 149         int period;             /* current DMA period */
 150         int asp_channel;        /* Master DMA channel */
 151         int asp_link[2];        /* asp parameter link channel, ping/pong */
 152         struct davinci_pcm_dma_params *params;  /* DMA params */
 153         int ram_channel;
 154         int ram_link;
 155         int ram_link2;
 156         struct edmacc_param asp_params;
 157         struct edmacc_param ram_params;
 158 };
 159
 160 static void davinci_pcm_period_elapsed(struct snd_pcm_substream *substream)
 161 {
 162         struct davinci_runtime_data *prtd = substream->runtime->private_data;
 163         struct snd_pcm_runtime *runtime = substream->runtime;
 164
 165         prtd->period++;
 166         if (unlikely(prtd->period >= runtime->periods))
 167                 prtd->period = 0;
 168 }
 169
 170 static void davinci_pcm_period_reset(struct snd_pcm_substream *substream)
 171 {
 172         struct davinci_runtime_data *prtd = substream->runtime->private_data;
 173
 174         prtd->period = 0;
 175 }
 176 /*
 177  * Not used with ping/pong
 178  */
 179 static void davinci_pcm_enqueue_dma(struct snd_pcm_substream *substream)
 180 {
 181         struct davinci_runtime_data *prtd = substream->runtime->private_data;
 182         struct snd_pcm_runtime *runtime = substream->runtime;
 183         int link = prtd->asp_link[0];
 184         unsigned int period_size;
 185         unsigned int dma_offset;
 186         dma_addr_t dma_pos;
 187         dma_addr_t src, dst;
 188         unsigned short src_bidx, dst_bidx;
 189         unsigned short src_cidx, dst_cidx;
 190         unsigned int data_type;
 191         unsigned short acnt;
 192         unsigned int count;
 193         unsigned int fifo_level;
 194
 195         period_size = snd_pcm_lib_period_bytes(substream);
 196         dma_offset = prtd->period * period_size;
 197         dma_pos = runtime->dma_addr + dma_offset;
 198         fifo_level = prtd->params->fifo_level;
 199
 200         pr_debug("davinci_pcm: audio_set_dma_params_play channel = %d "
 201                 "dma_ptr = %x period_size=%x\n", link, dma_pos, period_size);
 202
 203         data_type = prtd->params->data_type;
 204         count = period_size / data_type;
 205         if (fifo_level)
 206                 count /= fifo_level;
 207
 208         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 209                 src = dma_pos;
 210                 dst = prtd->params->dma_addr;
 211                 src_bidx = data_type;
 212                 dst_bidx = 0;
 213                 src_cidx = data_type * fifo_level;
 214                 dst_cidx = 0;
 215         } else {
 216                 src = prtd->params->dma_addr;
 217                 dst = dma_pos;
 218                 src_bidx = 0;
 219                 dst_bidx = data_type;
 220                 src_cidx = 0;
 221                 dst_cidx = data_type * fifo_level;
 222         }
 223
 224         acnt = prtd->params->acnt;
 225         edma_set_src(link, src, INCR, W8BIT);
 226         edma_set_dest(link, dst, INCR, W8BIT);
 227
 228         edma_set_src_index(link, src_bidx, src_cidx);
 229         edma_set_dest_index(link, dst_bidx, dst_cidx);
 230
 231         if (!fifo_level)
 232                 edma_set_transfer_params(link, acnt, count, 1, 0, ASYNC);
 233         else
 234                 edma_set_transfer_params(link, acnt, fifo_level, count,
 235                                                         fifo_level, ABSYNC);
 236 }
 237
 238 static void davinci_pcm_dma_irq(unsigned link, u16 ch_status, void *data)
 239 {
 240         struct snd_pcm_substream *substream = data;
 241         struct davinci_runtime_data *prtd = substream->runtime->private_data;
 242
 243         print_buf_info(prtd->ram_channel, "i ram_channel");
 244         pr_debug("davinci_pcm: link=%d, status=0x%x\n", link, ch_status);
 245
 246         if (unlikely(ch_status != DMA_COMPLETE))
 247                 return;
 248
 249         if (snd_pcm_running(substream)) {
 250                 spin_lock(&prtd->lock);
 251                 if (prtd->ram_channel < 0) {
 252                         /* No ping/pong must fix up link dma data*/
 253                         davinci_pcm_enqueue_dma(substream);
 254                 }
 255                 davinci_pcm_period_elapsed(substream);
 256                 spin_unlock(&prtd->lock);
 257                 snd_pcm_period_elapsed(substream);
 258         }
 259 }
 260
 261 static int allocate_sram(struct snd_pcm_substream *substream, unsigned size,
 262                 struct snd_pcm_hardware *ppcm)
 263 {
 264         struct snd_dma_buffer *buf = &substream->dma_buffer;
 265         struct snd_dma_buffer *iram_dma = NULL;
 266         dma_addr_t iram_phys = 0;
 267         void *iram_virt = NULL;
 268
 269         if (buf->private_data || !size)
 270                 return 0;
 271
 272         ppcm->period_bytes_max = size;
 273         iram_virt = sram_alloc(size, &iram_phys);
 274         if (!iram_virt)
 275                 goto exit1;
 276         iram_dma = kzalloc(sizeof(*iram_dma), GFP_KERNEL);
 277         if (!iram_dma)
 278                 goto exit2;
 279         iram_dma->area = iram_virt;
 280         iram_dma->addr = iram_phys;
 281         memset(iram_dma->area, 0, size);
 282         iram_dma->bytes = size;
 283         buf->private_data = iram_dma;
 284         return 0;
 285 exit2:
 286         if (iram_virt)
 287                 sram_free(iram_virt, size);
 288 exit1:
 289         return -ENOMEM;
 290 }
 291
 292 /*
 293  * Only used with ping/pong.
 294  * This is called after runtime->dma_addr, period_bytes and data_type are valid
 295  */
 296 static int ping_pong_dma_setup(struct snd_pcm_substream *substream)
 297 {
 298         unsigned short ram_src_cidx, ram_dst_cidx;
 299         struct snd_pcm_runtime *runtime = substream->runtime;
 300         struct davinci_runtime_data *prtd = runtime->private_data;
 301         struct snd_dma_buffer *iram_dma =
 302                 (struct snd_dma_buffer *)substream->dma_buffer.private_data;
 303         struct davinci_pcm_dma_params *params = prtd->params;
 304         unsigned int data_type = params->data_type;
 305         unsigned int acnt = params->acnt;
 306         /* divide by 2 for ping/pong */
 307         unsigned int ping_size = snd_pcm_lib_period_bytes(substream) >> 1;
 308         int link = prtd->asp_link[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(link, asp_src_pong, INCR, W8BIT);
 320
 321                 link = prtd->asp_link[0];
 322                 edma_set_src_index(link, data_type, data_type * fifo_level);
 323                 link = prtd->asp_link[1];
 324                 edma_set_src_index(link, data_type, data_type * fifo_level);
 325
 326                 link = prtd->ram_link;
 327                 edma_set_src(link, runtime->dma_addr, INCR, W32BIT);
 328         } else {
 329                 dma_addr_t asp_dst_pong = iram_dma->addr + ping_size;
 330                 ram_src_cidx = -ping_size;
 331                 ram_dst_cidx = ping_size;
 332                 edma_set_dest(link, asp_dst_pong, INCR, W8BIT);
 333
 334                 link = prtd->asp_link[0];
 335                 edma_set_dest_index(link, data_type, data_type * fifo_level);
 336                 link = prtd->asp_link[1];
 337                 edma_set_dest_index(link, data_type, data_type * fifo_level);
 338
 339                 link = prtd->ram_link;
 340                 edma_set_dest(link, runtime->dma_addr, INCR, W32BIT);
 341         }
 342
 343         if (!fifo_level) {
 344                 count = ping_size / data_type;
 345                 edma_set_transfer_params(prtd->asp_link[0], acnt, count,
 346                                 1, 0, ASYNC);
 347                 edma_set_transfer_params(prtd->asp_link[1], acnt, count,
 348                                 1, 0, ASYNC);
 349         } else {
 350                 count = ping_size / (data_type * fifo_level);
 351                 edma_set_transfer_params(prtd->asp_link[0], acnt, fifo_level,
 352                                 count, fifo_level, ABSYNC);
 353                 edma_set_transfer_params(prtd->asp_link[1], acnt, fifo_level,
 354                                 count, fifo_level, ABSYNC);
 355         }
 356
 357         link = prtd->ram_link;
 358         edma_set_src_index(link, ping_size, ram_src_cidx);
 359         edma_set_dest_index(link, ping_size, ram_dst_cidx);
 360         edma_set_transfer_params(link, ping_size, 2,
 361                         runtime->periods, 2, ASYNC);
 362
 363         /* init master params */
 364         edma_read_slot(prtd->asp_link[0], &prtd->asp_params);
 365         edma_read_slot(prtd->ram_link, &prtd->ram_params);
 366         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 367                 struct edmacc_param p_ram;
 368                 /* Copy entire iram buffer before playback started */
 369                 prtd->ram_params.a_b_cnt = (1 << 16) | (ping_size << 1);
 370                 /* 0 dst_bidx */
 371                 prtd->ram_params.src_dst_bidx = (ping_size << 1);
 372                 /* 0 dst_cidx */
 373                 prtd->ram_params.src_dst_cidx = (ping_size << 1);
 374                 prtd->ram_params.ccnt = 1;
 375
 376                 /* Skip 1st period */
 377                 edma_read_slot(prtd->ram_link, &p_ram);
 378                 p_ram.src += (ping_size << 1);
 379                 p_ram.ccnt -= 1;
 380                 edma_write_slot(prtd->ram_link2, &p_ram);
 381                 /*
 382                  * When 1st started, ram -> iram dma channel will fill the
 383                  * entire iram.  Then, whenever a ping/pong asp buffer finishes,
 384                  * 1/2 iram will be filled.
 385                  */
 386                 prtd->ram_params.link_bcntrld =
 387                         EDMA_CHAN_SLOT(prtd->ram_link2) << 5;
 388         }
 389         return 0;
 390 }
 391
 392 /* 1 asp tx or rx channel using 2 parameter channels
 393  * 1 ram to/from iram channel using 1 parameter channel
 394  *
 395  * Playback
 396  * ram copy channel kicks off first,
 397  * 1st ram copy of entire iram buffer completion kicks off asp channel
 398  * asp tcc always kicks off ram copy of 1/2 iram buffer
 399  *
 400  * Record
 401  * asp channel starts, tcc kicks off ram copy
 402  */
 403 static int request_ping_pong(struct snd_pcm_substream *substream,
 404                 struct davinci_runtime_data *prtd,
 405                 struct snd_dma_buffer *iram_dma)
 406 {
 407         dma_addr_t asp_src_ping;
 408         dma_addr_t asp_dst_ping;
 409         int link;
 410         struct davinci_pcm_dma_params *params = prtd->params;
 411
 412         /* Request ram master channel */
 413         link = prtd->ram_channel = edma_alloc_channel(EDMA_CHANNEL_ANY,
 414                                   davinci_pcm_dma_irq, substream,
 415                                   prtd->params->ram_chan_q);
 416         if (link < 0)
 417                 goto exit1;
 418
 419         /* Request ram link channel */
 420         link = prtd->ram_link = edma_alloc_slot(
 421                         EDMA_CTLR(prtd->ram_channel), EDMA_SLOT_ANY);
 422         if (link < 0)
 423                 goto exit2;
 424
 425         link = prtd->asp_link[1] = edma_alloc_slot(
 426                         EDMA_CTLR(prtd->asp_channel), EDMA_SLOT_ANY);
 427         if (link < 0)
 428                 goto exit3;
 429
 430         prtd->ram_link2 = -1;
 431         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 432                 link = prtd->ram_link2 = edma_alloc_slot(
 433                         EDMA_CTLR(prtd->ram_channel), EDMA_SLOT_ANY);
 434                 if (link < 0)
 435                         goto exit4;
 436         }
 437         /* circle ping-pong buffers */
 438         edma_link(prtd->asp_link[0], prtd->asp_link[1]);
 439         edma_link(prtd->asp_link[1], prtd->asp_link[0]);
 440         /* circle ram buffers */
 441         edma_link(prtd->ram_link, prtd->ram_link);
 442
 443         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 444                 asp_src_ping = iram_dma->addr;
 445                 asp_dst_ping = params->dma_addr;        /* fifo */
 446         } else {
 447                 asp_src_ping = params->dma_addr;        /* fifo */
 448                 asp_dst_ping = iram_dma->addr;
 449         }
 450         /* ping */
 451         link = prtd->asp_link[0];
 452         edma_set_src(link, asp_src_ping, INCR, W16BIT);
 453         edma_set_dest(link, asp_dst_ping, INCR, W16BIT);
 454         edma_set_src_index(link, 0, 0);
 455         edma_set_dest_index(link, 0, 0);
 456
 457         edma_read_slot(link, &prtd->asp_params);
 458         prtd->asp_params.opt &= ~(TCCMODE | EDMA_TCC(0x3f) | TCINTEN);
 459         prtd->asp_params.opt |= TCCHEN |
 460                 EDMA_TCC(prtd->ram_channel & 0x3f);
 461         edma_write_slot(link, &prtd->asp_params);
 462
 463         /* pong */
 464         link = prtd->asp_link[1];
 465         edma_set_src(link, asp_src_ping, INCR, W16BIT);
 466         edma_set_dest(link, asp_dst_ping, INCR, W16BIT);
 467         edma_set_src_index(link, 0, 0);
 468         edma_set_dest_index(link, 0, 0);
 469
 470         edma_read_slot(link, &prtd->asp_params);
 471         prtd->asp_params.opt &= ~(TCCMODE | EDMA_TCC(0x3f));
 472         /* interrupt after every pong completion */
 473         prtd->asp_params.opt |= TCINTEN | TCCHEN |
 474                 EDMA_TCC(prtd->ram_channel & 0x3f);
 475         edma_write_slot(link, &prtd->asp_params);
 476
 477         /* ram */
 478         link = prtd->ram_link;
 479         edma_set_src(link, iram_dma->addr, INCR, W32BIT);
 480         edma_set_dest(link, iram_dma->addr, INCR, W32BIT);
 481         pr_debug("%s: audio dma channels/slots in use for ram:%u %u %u,"
 482                 "for asp:%u %u %u\n", __func__,
 483                 prtd->ram_channel, prtd->ram_link, prtd->ram_link2,
 484                 prtd->asp_channel, prtd->asp_link[0],
 485                 prtd->asp_link[1]);
 486         return 0;
 487 exit4:
 488         edma_free_channel(prtd->asp_link[1]);
 489         prtd->asp_link[1] = -1;
 490 exit3:
 491         edma_free_channel(prtd->ram_link);
 492         prtd->ram_link = -1;
 493 exit2:
 494         edma_free_channel(prtd->ram_channel);
 495         prtd->ram_channel = -1;
 496 exit1:
 497         return link;
 498 }
 499
 500 static int davinci_pcm_dma_request(struct snd_pcm_substream *substream)
 501 {
 502         struct snd_dma_buffer *iram_dma;
 503         struct davinci_runtime_data *prtd = substream->runtime->private_data;
 504         struct davinci_pcm_dma_params *params = prtd->params;
 505         int link;
 506
 507         if (!params)
 508                 return -ENODEV;
 509
 510         /* Request asp master DMA channel */
 511         link = prtd->asp_channel = edma_alloc_channel(params->channel,
 512                         davinci_pcm_dma_irq, substream,
 513                         prtd->params->asp_chan_q);
 514         if (link < 0)
 515                 goto exit1;
 516
 517         /* Request asp link channels */
 518         link = prtd->asp_link[0] = edma_alloc_slot(
 519                         EDMA_CTLR(prtd->asp_channel), EDMA_SLOT_ANY);
 520         if (link < 0)
 521                 goto exit2;
 522
 523         iram_dma = (struct snd_dma_buffer *)substream->dma_buffer.private_data;
 524         if (iram_dma) {
 525                 if (request_ping_pong(substream, prtd, iram_dma) == 0)
 526                         return 0;
 527                 printk(KERN_WARNING "%s: dma channel allocation failed,"
 528                                 "not using sram\n", __func__);
 529         }
 530
 531         /* Issue transfer completion IRQ when the channel completes a
 532          * transfer, then always reload from the same slot (by a kind
 533          * of loopback link).  The completion IRQ handler will update
 534          * the reload slot with a new buffer.
 535          *
 536          * REVISIT save p_ram here after setting up everything except
 537          * the buffer and its length (ccnt) ... use it as a template
 538          * so davinci_pcm_enqueue_dma() takes less time in IRQ.
 539          */
 540         edma_read_slot(link, &prtd->asp_params);
 541         prtd->asp_params.opt |= TCINTEN |
 542                 EDMA_TCC(EDMA_CHAN_SLOT(prtd->asp_channel));
 543         prtd->asp_params.link_bcntrld = EDMA_CHAN_SLOT(link) << 5;
 544         edma_write_slot(link, &prtd->asp_params);
 545         return 0;
 546 exit2:
 547         edma_free_channel(prtd->asp_channel);
 548         prtd->asp_channel = -1;
 549 exit1:
 550         return link;
 551 }
 552
 553 static int davinci_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 554 {
 555         struct davinci_runtime_data *prtd = substream->runtime->private_data;
 556         int ret = 0;
 557
 558         spin_lock(&prtd->lock);
 559
 560         switch (cmd) {
 561         case SNDRV_PCM_TRIGGER_START:
 562                 edma_start(prtd->asp_channel);
 563                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 564                     prtd->ram_channel >= 0) {
 565                         /* copy 1st iram buffer */
 566                         edma_start(prtd->ram_channel);
 567                 }
 568                 break;
 569         case SNDRV_PCM_TRIGGER_RESUME:
 570         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 571                 edma_resume(prtd->asp_channel);
 572                 break;
 573         case SNDRV_PCM_TRIGGER_STOP:
 574         case SNDRV_PCM_TRIGGER_SUSPEND:
 575         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 576                 edma_pause(prtd->asp_channel);
 577                 break;
 578         default:
 579                 ret = -EINVAL;
 580                 break;
 581         }
 582
 583         spin_unlock(&prtd->lock);
 584
 585         return ret;
 586 }
 587
 588 static int davinci_pcm_prepare(struct snd_pcm_substream *substream)
 589 {
 590         struct davinci_runtime_data *prtd = substream->runtime->private_data;
 591
 592         davinci_pcm_period_reset(substream);
 593         if (prtd->ram_channel >= 0) {
 594                 int ret = ping_pong_dma_setup(substream);
 595                 if (ret < 0)
 596                         return ret;
 597
 598                 edma_write_slot(prtd->ram_channel, &prtd->ram_params);
 599                 edma_write_slot(prtd->asp_channel, &prtd->asp_params);
 600
 601                 print_buf_info(prtd->ram_channel, "ram_channel");
 602                 print_buf_info(prtd->ram_link, "ram_link");
 603                 print_buf_info(prtd->ram_link2, "ram_link2");
 604                 print_buf_info(prtd->asp_channel, "asp_channel");
 605                 print_buf_info(prtd->asp_link[0], "asp_link[0]");
 606                 print_buf_info(prtd->asp_link[1], "asp_link[1]");
 607
 608                 /*
 609                  * There is a phase offset of 2 periods between the position
 610                  * used by dma setup and the position reported in the pointer
 611                  * function.
 612                  *
 613                  * The phase offset, when not using ping-pong buffers, is due to
 614                  * the two consecutive calls to davinci_pcm_enqueue_dma() below.
 615                  *
 616                  * Whereas here, with ping-pong buffers, the phase is due to
 617                  * there being an entire buffer transfer complete before the
 618                  * first dma completion event triggers davinci_pcm_dma_irq().
 619                  */
 620                 davinci_pcm_period_elapsed(substream);
 621                 davinci_pcm_period_elapsed(substream);
 622
 623                 return 0;
 624         }
 625         davinci_pcm_enqueue_dma(substream);
 626         davinci_pcm_period_elapsed(substream);
 627
 628         /* Copy self-linked parameter RAM entry into master channel */
 629         edma_read_slot(prtd->asp_link[0], &prtd->asp_params);
 630         edma_write_slot(prtd->asp_channel, &prtd->asp_params);
 631         davinci_pcm_enqueue_dma(substream);
 632         davinci_pcm_period_elapsed(substream);
 633
 634         return 0;
 635 }
 636
 637 static snd_pcm_uframes_t
 638 davinci_pcm_pointer(struct snd_pcm_substream *substream)
 639 {
 640         struct snd_pcm_runtime *runtime = substream->runtime;
 641         struct davinci_runtime_data *prtd = runtime->private_data;
 642         unsigned int offset;
 643         int asp_count;
 644         unsigned int period_size = snd_pcm_lib_period_bytes(substream);
 645
 646         /*
 647          * There is a phase offset of 2 periods between the position used by dma
 648          * setup and the position reported in the pointer function. Either +2 in
 649          * the dma setup or -2 here in the pointer function (with wrapping,
 650          * both) accounts for this offset -- choose the latter since it makes
 651          * the first-time setup clearer.
 652          */
 653         spin_lock(&prtd->lock);
 654         asp_count = prtd->period - 2;
 655         spin_unlock(&prtd->lock);
 656
 657         if (asp_count < 0)
 658                 asp_count += runtime->periods;
 659         asp_count *= period_size;
 660
 661         offset = bytes_to_frames(runtime, asp_count);
 662         if (offset >= runtime->buffer_size)
 663                 offset = 0;
 664
 665         return offset;
 666 }
 667
 668 static int davinci_pcm_open(struct snd_pcm_substream *substream)
 669 {
 670         struct snd_pcm_runtime *runtime = substream->runtime;
 671         struct davinci_runtime_data *prtd;
 672         struct snd_pcm_hardware *ppcm;
 673         int ret = 0;
 674         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 675         struct davinci_pcm_dma_params *pa;
 676         struct davinci_pcm_dma_params *params;
 677
 678         pa = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 679         if (!pa)
 680                 return -ENODEV;
 681         params = &pa[substream->stream];
 682
 683         ppcm = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
 684                         &pcm_hardware_playback : &pcm_hardware_capture;
 685         allocate_sram(substream, params->sram_size, ppcm);
 686         snd_soc_set_runtime_hwparams(substream, ppcm);
 687         /* ensure that buffer size is a multiple of period size */
 688         ret = snd_pcm_hw_constraint_integer(runtime,
 689                                                 SNDRV_PCM_HW_PARAM_PERIODS);
 690         if (ret < 0)
 691                 return ret;
 692
 693         prtd = kzalloc(sizeof(struct davinci_runtime_data), GFP_KERNEL);
 694         if (prtd == NULL)
 695                 return -ENOMEM;
 696
 697         spin_lock_init(&prtd->lock);
 698         prtd->params = params;
 699         prtd->asp_channel = -1;
 700         prtd->asp_link[0] = prtd->asp_link[1] = -1;
 701         prtd->ram_channel = -1;
 702         prtd->ram_link = -1;
 703         prtd->ram_link2 = -1;
 704
 705         runtime->private_data = prtd;
 706
 707         ret = davinci_pcm_dma_request(substream);
 708         if (ret) {
 709                 printk(KERN_ERR "davinci_pcm: Failed to get dma channels\n");
 710                 kfree(prtd);
 711         }
 712
 713         return ret;
 714 }
 715
 716 static int davinci_pcm_close(struct snd_pcm_substream *substream)
 717 {
 718         struct snd_pcm_runtime *runtime = substream->runtime;
 719         struct davinci_runtime_data *prtd = runtime->private_data;
 720
 721         if (prtd->ram_channel >= 0)
 722                 edma_stop(prtd->ram_channel);
 723         if (prtd->asp_channel >= 0)
 724                 edma_stop(prtd->asp_channel);
 725         if (prtd->asp_link[0] >= 0)
 726                 edma_unlink(prtd->asp_link[0]);
 727         if (prtd->asp_link[1] >= 0)
 728                 edma_unlink(prtd->asp_link[1]);
 729         if (prtd->ram_link >= 0)
 730                 edma_unlink(prtd->ram_link);
 731
 732         if (prtd->asp_link[0] >= 0)
 733                 edma_free_slot(prtd->asp_link[0]);
 734         if (prtd->asp_link[1] >= 0)
 735                 edma_free_slot(prtd->asp_link[1]);
 736         if (prtd->asp_channel >= 0)
 737                 edma_free_channel(prtd->asp_channel);
 738         if (prtd->ram_link >= 0)
 739                 edma_free_slot(prtd->ram_link);
 740         if (prtd->ram_link2 >= 0)
 741                 edma_free_slot(prtd->ram_link2);
 742         if (prtd->ram_channel >= 0)
 743                 edma_free_channel(prtd->ram_channel);
 744
 745         kfree(prtd);
 746
 747         return 0;
 748 }
 749
 750 static int davinci_pcm_hw_params(struct snd_pcm_substream *substream,
 751                                  struct snd_pcm_hw_params *hw_params)
 752 {
 753         return snd_pcm_lib_malloc_pages(substream,
 754                                         params_buffer_bytes(hw_params));
 755 }
 756
 757 static int davinci_pcm_hw_free(struct snd_pcm_substream *substream)
 758 {
 759         return snd_pcm_lib_free_pages(substream);
 760 }
 761
 762 static int davinci_pcm_mmap(struct snd_pcm_substream *substream,
 763                             struct vm_area_struct *vma)
 764 {
 765         struct snd_pcm_runtime *runtime = substream->runtime;
 766
 767         return dma_mmap_writecombine(substream->pcm->card->dev, vma,
 768                                      runtime->dma_area,
 769                                      runtime->dma_addr,
 770                                      runtime->dma_bytes);
 771 }
 772
 773 static struct snd_pcm_ops davinci_pcm_ops = {
 774         .open =         davinci_pcm_open,
 775         .close =        davinci_pcm_close,
 776         .ioctl =        snd_pcm_lib_ioctl,
 777         .hw_params =    davinci_pcm_hw_params,
 778         .hw_free =      davinci_pcm_hw_free,
 779         .prepare =      davinci_pcm_prepare,
 780         .trigger =      davinci_pcm_trigger,
 781         .pointer =      davinci_pcm_pointer,
 782         .mmap =         davinci_pcm_mmap,
 783 };
 784
 785 static int davinci_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream,
 786                 size_t size)
 787 {
 788         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 789         struct snd_dma_buffer *buf = &substream->dma_buffer;
 790
 791         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 792         buf->dev.dev = pcm->card->dev;
 793         buf->private_data = NULL;
 794         buf->area = dma_alloc_writecombine(pcm->card->dev, size,
 795                                            &buf->addr, GFP_KERNEL);
 796
 797         pr_debug("davinci_pcm: preallocate_dma_buffer: area=%p, addr=%p, "
 798                 "size=%d\n", (void *) buf->area, (void *) buf->addr, size);
 799
 800         if (!buf->area)
 801                 return -ENOMEM;
 802
 803         buf->bytes = size;
 804         return 0;
 805 }
 806
 807 static void davinci_pcm_free(struct snd_pcm *pcm)
 808 {
 809         struct snd_pcm_substream *substream;
 810         struct snd_dma_buffer *buf;
 811         int stream;
 812
 813         for (stream = 0; stream < 2; stream++) {
 814                 struct snd_dma_buffer *iram_dma;
 815                 substream = pcm->streams[stream].substream;
 816                 if (!substream)
 817                         continue;
 818
 819                 buf = &substream->dma_buffer;
 820                 if (!buf->area)
 821                         continue;
 822
 823                 dma_free_writecombine(pcm->card->dev, buf->bytes,
 824                                       buf->area, buf->addr);
 825                 buf->area = NULL;
 826                 iram_dma = buf->private_data;
 827                 if (iram_dma) {
 828                         sram_free(iram_dma->area, iram_dma->bytes);
 829                         kfree(iram_dma);
 830                 }
 831         }
 832 }
 833
 834 static u64 davinci_pcm_dmamask = 0xffffffff;
 835
 836 static int davinci_pcm_new(struct snd_soc_pcm_runtime *rtd)
 837 {
 838         struct snd_card *card = rtd->card->snd_card;
 839         struct snd_soc_dai *dai = rtd->cpu_dai;
 840         struct snd_pcm *pcm = rtd->pcm;
 841         int ret;
 842
 843         if (!card->dev->dma_mask)
 844                 card->dev->dma_mask = &davinci_pcm_dmamask;
 845         if (!card->dev->coherent_dma_mask)
 846                 card->dev->coherent_dma_mask = 0xffffffff;
 847
 848         if (dai->driver->playback.channels_min) {
 849                 ret = davinci_pcm_preallocate_dma_buffer(pcm,
 850                         SNDRV_PCM_STREAM_PLAYBACK,
 851                         pcm_hardware_playback.buffer_bytes_max);
 852                 if (ret)
 853                         return ret;
 854         }
 855
 856         if (dai->driver->capture.channels_min) {
 857                 ret = davinci_pcm_preallocate_dma_buffer(pcm,
 858                         SNDRV_PCM_STREAM_CAPTURE,
 859                         pcm_hardware_capture.buffer_bytes_max);
 860                 if (ret)
 861                         return ret;
 862         }
 863
 864         return 0;
 865 }
 866
 867 static struct snd_soc_platform_driver davinci_soc_platform = {
 868         .ops =          &davinci_pcm_ops,
 869         .pcm_new =      davinci_pcm_new,
 870         .pcm_free =     davinci_pcm_free,
 871 };
 872
 873 static int __devinit davinci_soc_platform_probe(struct platform_device *pdev)
 874 {
 875         return snd_soc_register_platform(&pdev->dev, &davinci_soc_platform);
 876 }
 877
 878 static int __devexit davinci_soc_platform_remove(struct platform_device *pdev)
 879 {
 880         snd_soc_unregister_platform(&pdev->dev);
 881         return 0;
 882 }
 883
 884 static struct platform_driver davinci_pcm_driver = {
 885         .driver = {
 886                         .name = "davinci-pcm-audio",
 887                         .owner = THIS_MODULE,
 888         },
 889
 890         .probe = davinci_soc_platform_probe,
 891         .remove = __devexit_p(davinci_soc_platform_remove),
 892 };
 893
 894 static int __init snd_davinci_pcm_init(void)
 895 {
 896         return platform_driver_register(&davinci_pcm_driver);
 897 }
 898 module_init(snd_davinci_pcm_init);
 899
 900 static void __exit snd_davinci_pcm_exit(void)
 901 {
 902         platform_driver_unregister(&davinci_pcm_driver);
 903 }
 904 module_exit(snd_davinci_pcm_exit);
 905
 906 MODULE_AUTHOR("Vladimir Barinov");
 907 MODULE_DESCRIPTION("TI DAVINCI PCM DMA module");
 908 MODULE_LICENSE("GPL");