sound/soc/davinci/davinci-pcm.c

   1 /*
   2  * ALSA PCM interface for the TI DAVINCI processor
   3  *
   4  * Author:      Vladimir Barinov, <vbarinov@embeddedalley.com>
   5  * Copyright:   (C) 2007 MontaVista Software, Inc., <source@mvista.com>
   6  * added SRAM ping/pong (C) 2008 Troy Kisky <troy.kisky@boundarydevices.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/init.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/slab.h>
  17 #include <linux/dma-mapping.h>
  18 #include <linux/kernel.h>
  19 #include <linux/genalloc.h>
  20 #include <linux/platform_data/edma.h>
  21
  22 #include <sound/core.h>
  23 #include <sound/pcm.h>
  24 #include <sound/pcm_params.h>
  25 #include <sound/soc.h>
  26
  27 #include <asm/dma.h>
  28
  29 #include "davinci-pcm.h"
  30
  31 #ifdef DEBUG
  32 static void print_buf_info(int slot, char *name)
  33 {
  34         struct edmacc_param p;
  35         if (slot < 0)
  36                 return;
  37         edma_read_slot(slot, &p);
  38         printk(KERN_DEBUG "%s: 0x%x, opt=%x, src=%x, a_b_cnt=%x dst=%x\n",
  39                         name, slot, p.opt, p.src, p.a_b_cnt, p.dst);
  40         printk(KERN_DEBUG "    src_dst_bidx=%x link_bcntrld=%x src_dst_cidx=%x ccnt=%x\n",
  41                         p.src_dst_bidx, p.link_bcntrld, p.src_dst_cidx, p.ccnt);
  42 }
  43 #else
  44 static void print_buf_info(int slot, char *name)
  45 {
  46 }
  47 #endif
  48
  49 #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_192000 | SNDRV_PCM_RATE_KNOT,
  72         .rate_min = 8000,
  73         .rate_max = 192000,
  74         .channels_min = 2,
  75         .channels_max = 384,
  76         .buffer_bytes_max = 128 * 1024,
  77         .period_bytes_min = 32,
  78         .period_bytes_max = 8 * 1024,
  79         .periods_min = 16,
  80         .periods_max = 255,
  81         .fifo_size = 0,
  82 };
  83
  84 static struct snd_pcm_hardware pcm_hardware_capture = {
  85         .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
  86                  SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
  87                  SNDRV_PCM_INFO_PAUSE |
  88                  SNDRV_PCM_INFO_BATCH),
  89         .formats = DAVINCI_PCM_FMTBITS,
  90         .rates = SNDRV_PCM_RATE_8000_192000 | SNDRV_PCM_RATE_KNOT,
  91         .rate_min = 8000,
  92         .rate_max = 192000,
  93         .channels_min = 2,
  94         .channels_max = 384,
  95         .buffer_bytes_max = 128 * 1024,
  96         .period_bytes_min = 32,
  97         .period_bytes_max = 8 * 1024,
  98         .periods_min = 16,
  99         .periods_max = 255,
 100         .fifo_size = 0,
 101 };
 102
 103 /*
 104  * How ping/pong works....
 105  *
 106  * Playback:
 107  * ram_params - copys 2*ping_size from start of SDRAM to iram,
 108  *      links to ram_link2
 109  * ram_link2 - copys rest of SDRAM to iram in ping_size units,
 110  *      links to ram_link
 111  * ram_link - copys entire SDRAM to iram in ping_size uints,
 112  *      links to self
 113  *
 114  * asp_params - same as asp_link[0]
 115  * asp_link[0] - copys from lower half of iram to asp port
 116  *      links to asp_link[1], triggers iram copy event on completion
 117  * asp_link[1] - copys from upper half of iram to asp port
 118  *      links to asp_link[0], triggers iram copy event on completion
 119  *      triggers interrupt only needed to let upper SOC levels update position
 120  *      in stream on completion
 121  *
 122  * When playback is started:
 123  *      ram_params started
 124  *      asp_params started
 125  *
 126  * Capture:
 127  * ram_params - same as ram_link,
 128  *      links to ram_link
 129  * ram_link - same as playback
 130  *      links to self
 131  *
 132  * asp_params - same as playback
 133  * asp_link[0] - same as playback
 134  * asp_link[1] - same as playback
 135  *
 136  * When capture is started:
 137  *      asp_params started
 138  */
 139 struct davinci_runtime_data {
 140         spinlock_t lock;
 141         int period;             /* current DMA period */
 142         int asp_channel;        /* Master DMA channel */
 143         int asp_link[2];        /* asp parameter link channel, ping/pong */
 144         struct davinci_pcm_dma_params *params;  /* DMA params */
 145         int ram_channel;
 146         int ram_link;
 147         int ram_link2;
 148         struct edmacc_param asp_params;
 149         struct edmacc_param ram_params;
 150 };
 151
 152 static void davinci_pcm_period_elapsed(struct snd_pcm_substream *substream)
 153 {
 154         struct davinci_runtime_data *prtd = substream->runtime->private_data;
 155         struct snd_pcm_runtime *runtime = substream->runtime;
 156
 157         prtd->period++;
 158         if (unlikely(prtd->period >= runtime->periods))
 159                 prtd->period = 0;
 160 }
 161
 162 static void davinci_pcm_period_reset(struct snd_pcm_substream *substream)
 163 {
 164         struct davinci_runtime_data *prtd = substream->runtime->private_data;
 165
 166         prtd->period = 0;
 167 }
 168 /*
 169  * Not used with ping/pong
 170  */
 171 static void davinci_pcm_enqueue_dma(struct snd_pcm_substream *substream)
 172 {
 173         struct davinci_runtime_data *prtd = substream->runtime->private_data;
 174         struct snd_pcm_runtime *runtime = substream->runtime;
 175         unsigned int period_size;
 176         unsigned int dma_offset;
 177         dma_addr_t dma_pos;
 178         dma_addr_t src, dst;
 179         unsigned short src_bidx, dst_bidx;
 180         unsigned short src_cidx, dst_cidx;
 181         unsigned int data_type;
 182         unsigned short acnt;
 183         unsigned int count;
 184         unsigned int fifo_level;
 185
 186         period_size = snd_pcm_lib_period_bytes(substream);
 187         dma_offset = prtd->period * period_size;
 188         dma_pos = runtime->dma_addr + dma_offset;
 189         fifo_level = prtd->params->fifo_level;
 190
 191         pr_debug("davinci_pcm: audio_set_dma_params_play channel = %d "
 192                 "dma_ptr = %x period_size=%x\n", prtd->asp_link[0], dma_pos,
 193                 period_size);
 194
 195         data_type = prtd->params->data_type;
 196         count = period_size / data_type;
 197         if (fifo_level)
 198                 count /= fifo_level;
 199
 200         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 201                 src = dma_pos;
 202                 dst = prtd->params->dma_addr;
 203                 src_bidx = data_type;
 204                 dst_bidx = 4;
 205                 src_cidx = data_type * fifo_level;
 206                 dst_cidx = 0;
 207         } else {
 208                 src = prtd->params->dma_addr;
 209                 dst = dma_pos;
 210                 src_bidx = 0;
 211                 dst_bidx = data_type;
 212                 src_cidx = 0;
 213                 dst_cidx = data_type * fifo_level;
 214         }
 215
 216         acnt = prtd->params->acnt;
 217         edma_set_src(prtd->asp_link[0], src, INCR, W8BIT);
 218         edma_set_dest(prtd->asp_link[0], dst, INCR, W8BIT);
 219
 220         edma_set_src_index(prtd->asp_link[0], src_bidx, src_cidx);
 221         edma_set_dest_index(prtd->asp_link[0], dst_bidx, dst_cidx);
 222
 223         if (!fifo_level)
 224                 edma_set_transfer_params(prtd->asp_link[0], acnt, count, 1, 0,
 225                                                         ASYNC);
 226         else
 227                 edma_set_transfer_params(prtd->asp_link[0], acnt,
 228                                                 fifo_level,
 229                                                 count, fifo_level,
 230                                                 ABSYNC);
 231 }
 232
 233 static void davinci_pcm_dma_irq(unsigned link, u16 ch_status, void *data)
 234 {
 235         struct snd_pcm_substream *substream = data;
 236         struct davinci_runtime_data *prtd = substream->runtime->private_data;
 237
 238         print_buf_info(prtd->ram_channel, "i ram_channel");
 239         pr_debug("davinci_pcm: link=%d, status=0x%x\n", link, ch_status);
 240
 241         if (unlikely(ch_status != DMA_COMPLETE))
 242                 return;
 243
 244         if (snd_pcm_running(substream)) {
 245                 spin_lock(&prtd->lock);
 246                 if (prtd->ram_channel < 0) {
 247                         /* No ping/pong must fix up link dma data*/
 248                         davinci_pcm_enqueue_dma(substream);
 249                 }
 250                 davinci_pcm_period_elapsed(substream);
 251                 spin_unlock(&prtd->lock);
 252                 snd_pcm_period_elapsed(substream);
 253         }
 254 }
 255
 256 #ifdef CONFIG_GENERIC_ALLOCATOR
 257 static int allocate_sram(struct snd_pcm_substream *substream,
 258                 struct gen_pool *sram_pool, unsigned size,
 259                 struct snd_pcm_hardware *ppcm)
 260 {
 261         struct snd_dma_buffer *buf = &substream->dma_buffer;
 262         struct snd_dma_buffer *iram_dma = NULL;
 263         dma_addr_t iram_phys = 0;
 264         void *iram_virt = NULL;
 265
 266         if (buf->private_data || !size)
 267                 return 0;
 268
 269         ppcm->period_bytes_max = size;
 270         iram_virt = (void *)gen_pool_alloc(sram_pool, size);
 271         if (!iram_virt)
 272                 goto exit1;
 273         iram_phys = gen_pool_virt_to_phys(sram_pool, (unsigned)iram_virt);
 274         iram_dma = kzalloc(sizeof(*iram_dma), GFP_KERNEL);
 275         if (!iram_dma)
 276                 goto exit2;
 277         iram_dma->area = iram_virt;
 278         iram_dma->addr = iram_phys;
 279         memset(iram_dma->area, 0, size);
 280         iram_dma->bytes = size;
 281         buf->private_data = iram_dma;
 282         return 0;
 283 exit2:
 284         if (iram_virt)
 285                 gen_pool_free(sram_pool, (unsigned)iram_virt, size);
 286 exit1:
 287         return -ENOMEM;
 288 }
 289
 290 static void davinci_free_sram(struct snd_pcm_substream *substream,
 291                               struct snd_dma_buffer *iram_dma)
 292 {
 293         struct davinci_runtime_data *prtd = substream->runtime->private_data;
 294         struct gen_pool *sram_pool = prtd->params->sram_pool;
 295
 296         gen_pool_free(sram_pool, (unsigned) iram_dma->area, iram_dma->bytes);
 297 }
 298 #else
 299 static int allocate_sram(struct snd_pcm_substream *substream,
 300                 struct gen_pool *sram_pool, unsigned size,
 301                 struct snd_pcm_hardware *ppcm)
 302 {
 303         return 0;
 304 }
 305
 306 static void davinci_free_sram(struct snd_pcm_substream *substream,
 307                               struct snd_dma_buffer *iram_dma)
 308 {
 309 }
 310 #endif
 311
 312 /*
 313  * Only used with ping/pong.
 314  * This is called after runtime->dma_addr, period_bytes and data_type are valid
 315  */
 316 static int ping_pong_dma_setup(struct snd_pcm_substream *substream)
 317 {
 318         unsigned short ram_src_cidx, ram_dst_cidx;
 319         struct snd_pcm_runtime *runtime = substream->runtime;
 320         struct davinci_runtime_data *prtd = runtime->private_data;
 321         struct snd_dma_buffer *iram_dma =
 322                 (struct snd_dma_buffer *)substream->dma_buffer.private_data;
 323         struct davinci_pcm_dma_params *params = prtd->params;
 324         unsigned int data_type = params->data_type;
 325         unsigned int acnt = params->acnt;
 326         /* divide by 2 for ping/pong */
 327         unsigned int ping_size = snd_pcm_lib_period_bytes(substream) >> 1;
 328         unsigned int fifo_level = prtd->params->fifo_level;
 329         unsigned int count;
 330         if ((data_type == 0) || (data_type > 4)) {
 331                 printk(KERN_ERR "%s: data_type=%i\n", __func__, data_type);
 332                 return -EINVAL;
 333         }
 334         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 335                 dma_addr_t asp_src_pong = iram_dma->addr + ping_size;
 336                 ram_src_cidx = ping_size;
 337                 ram_dst_cidx = -ping_size;
 338                 edma_set_src(prtd->asp_link[1], asp_src_pong, INCR, W8BIT);
 339
 340                 edma_set_src_index(prtd->asp_link[0], data_type,
 341                                 data_type * fifo_level);
 342                 edma_set_src_index(prtd->asp_link[1], data_type,
 343                                 data_type * fifo_level);
 344
 345                 edma_set_src(prtd->ram_link, runtime->dma_addr, INCR, W32BIT);
 346         } else {
 347                 dma_addr_t asp_dst_pong = iram_dma->addr + ping_size;
 348                 ram_src_cidx = -ping_size;
 349                 ram_dst_cidx = ping_size;
 350                 edma_set_dest(prtd->asp_link[1], asp_dst_pong, INCR, W8BIT);
 351
 352                 edma_set_dest_index(prtd->asp_link[0], data_type,
 353                                 data_type * fifo_level);
 354                 edma_set_dest_index(prtd->asp_link[1], data_type,
 355                                 data_type * fifo_level);
 356
 357                 edma_set_dest(prtd->ram_link, runtime->dma_addr, INCR, W32BIT);
 358         }
 359
 360         if (!fifo_level) {
 361                 count = ping_size / data_type;
 362                 edma_set_transfer_params(prtd->asp_link[0], acnt, count,
 363                                 1, 0, ASYNC);
 364                 edma_set_transfer_params(prtd->asp_link[1], acnt, count,
 365                                 1, 0, ASYNC);
 366         } else {
 367                 count = ping_size / (data_type * fifo_level);
 368                 edma_set_transfer_params(prtd->asp_link[0], acnt, fifo_level,
 369                                 count, fifo_level, ABSYNC);
 370                 edma_set_transfer_params(prtd->asp_link[1], acnt, fifo_level,
 371                                 count, fifo_level, ABSYNC);
 372         }
 373
 374         edma_set_src_index(prtd->ram_link, ping_size, ram_src_cidx);
 375         edma_set_dest_index(prtd->ram_link, ping_size, ram_dst_cidx);
 376         edma_set_transfer_params(prtd->ram_link, ping_size, 2,
 377                         runtime->periods, 2, ASYNC);
 378
 379         /* init master params */
 380         edma_read_slot(prtd->asp_link[0], &prtd->asp_params);
 381         edma_read_slot(prtd->ram_link, &prtd->ram_params);
 382         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 383                 struct edmacc_param p_ram;
 384                 /* Copy entire iram buffer before playback started */
 385                 prtd->ram_params.a_b_cnt = (1 << 16) | (ping_size << 1);
 386                 /* 0 dst_bidx */
 387                 prtd->ram_params.src_dst_bidx = (ping_size << 1);
 388                 /* 0 dst_cidx */
 389                 prtd->ram_params.src_dst_cidx = (ping_size << 1);
 390                 prtd->ram_params.ccnt = 1;
 391
 392                 /* Skip 1st period */
 393                 edma_read_slot(prtd->ram_link, &p_ram);
 394                 p_ram.src += (ping_size << 1);
 395                 p_ram.ccnt -= 1;
 396                 edma_write_slot(prtd->ram_link2, &p_ram);
 397                 /*
 398                  * When 1st started, ram -> iram dma channel will fill the
 399                  * entire iram.  Then, whenever a ping/pong asp buffer finishes,
 400                  * 1/2 iram will be filled.
 401                  */
 402                 prtd->ram_params.link_bcntrld =
 403                         EDMA_CHAN_SLOT(prtd->ram_link2) << 5;
 404         }
 405         return 0;
 406 }
 407
 408 /* 1 asp tx or rx channel using 2 parameter channels
 409  * 1 ram to/from iram channel using 1 parameter channel
 410  *
 411  * Playback
 412  * ram copy channel kicks off first,
 413  * 1st ram copy of entire iram buffer completion kicks off asp channel
 414  * asp tcc always kicks off ram copy of 1/2 iram buffer
 415  *
 416  * Record
 417  * asp channel starts, tcc kicks off ram copy
 418  */
 419 static int request_ping_pong(struct snd_pcm_substream *substream,
 420                 struct davinci_runtime_data *prtd,
 421                 struct snd_dma_buffer *iram_dma)
 422 {
 423         dma_addr_t asp_src_ping;
 424         dma_addr_t asp_dst_ping;
 425         int ret;
 426         struct davinci_pcm_dma_params *params = prtd->params;
 427
 428         /* Request ram master channel */
 429         ret = prtd->ram_channel = edma_alloc_channel(EDMA_CHANNEL_ANY,
 430                                   davinci_pcm_dma_irq, substream,
 431                                   prtd->params->ram_chan_q);
 432         if (ret < 0)
 433                 goto exit1;
 434
 435         /* Request ram link channel */
 436         ret = prtd->ram_link = edma_alloc_slot(
 437                         EDMA_CTLR(prtd->ram_channel), EDMA_SLOT_ANY);
 438         if (ret < 0)
 439                 goto exit2;
 440
 441         ret = prtd->asp_link[1] = edma_alloc_slot(
 442                         EDMA_CTLR(prtd->asp_channel), EDMA_SLOT_ANY);
 443         if (ret < 0)
 444                 goto exit3;
 445
 446         prtd->ram_link2 = -1;
 447         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 448                 ret = prtd->ram_link2 = edma_alloc_slot(
 449                         EDMA_CTLR(prtd->ram_channel), EDMA_SLOT_ANY);
 450                 if (ret < 0)
 451                         goto exit4;
 452         }
 453         /* circle ping-pong buffers */
 454         edma_link(prtd->asp_link[0], prtd->asp_link[1]);
 455         edma_link(prtd->asp_link[1], prtd->asp_link[0]);
 456         /* circle ram buffers */
 457         edma_link(prtd->ram_link, prtd->ram_link);
 458
 459         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 460                 asp_src_ping = iram_dma->addr;
 461                 asp_dst_ping = params->dma_addr;        /* fifo */
 462         } else {
 463                 asp_src_ping = params->dma_addr;        /* fifo */
 464                 asp_dst_ping = iram_dma->addr;
 465         }
 466         /* ping */
 467         edma_set_src(prtd->asp_link[0], asp_src_ping, INCR, W16BIT);
 468         edma_set_dest(prtd->asp_link[0], asp_dst_ping, INCR, W16BIT);
 469         edma_set_src_index(prtd->asp_link[0], 0, 0);
 470         edma_set_dest_index(prtd->asp_link[0], 0, 0);
 471
 472         edma_read_slot(prtd->asp_link[0], &prtd->asp_params);
 473         prtd->asp_params.opt &= ~(TCCMODE | EDMA_TCC(0x3f) | TCINTEN);
 474         prtd->asp_params.opt |= TCCHEN |
 475                 EDMA_TCC(prtd->ram_channel & 0x3f);
 476         edma_write_slot(prtd->asp_link[0], &prtd->asp_params);
 477
 478         /* pong */
 479         edma_set_src(prtd->asp_link[1], asp_src_ping, INCR, W16BIT);
 480         edma_set_dest(prtd->asp_link[1], asp_dst_ping, INCR, W16BIT);
 481         edma_set_src_index(prtd->asp_link[1], 0, 0);
 482         edma_set_dest_index(prtd->asp_link[1], 0, 0);
 483
 484         edma_read_slot(prtd->asp_link[1], &prtd->asp_params);
 485         prtd->asp_params.opt &= ~(TCCMODE | EDMA_TCC(0x3f));
 486         /* interrupt after every pong completion */
 487         prtd->asp_params.opt |= TCINTEN | TCCHEN |
 488                 EDMA_TCC(prtd->ram_channel & 0x3f);
 489         edma_write_slot(prtd->asp_link[1], &prtd->asp_params);
 490
 491         /* ram */
 492         edma_set_src(prtd->ram_link, iram_dma->addr, INCR, W32BIT);
 493         edma_set_dest(prtd->ram_link, iram_dma->addr, INCR, W32BIT);
 494         pr_debug("%s: audio dma channels/slots in use for ram:%u %u %u,"
 495                 "for asp:%u %u %u\n", __func__,
 496                 prtd->ram_channel, prtd->ram_link, prtd->ram_link2,
 497                 prtd->asp_channel, prtd->asp_link[0],
 498                 prtd->asp_link[1]);
 499         return 0;
 500 exit4:
 501         edma_free_channel(prtd->asp_link[1]);
 502         prtd->asp_link[1] = -1;
 503 exit3:
 504         edma_free_channel(prtd->ram_link);
 505         prtd->ram_link = -1;
 506 exit2:
 507         edma_free_channel(prtd->ram_channel);
 508         prtd->ram_channel = -1;
 509 exit1:
 510         return ret;
 511 }
 512
 513 static int davinci_pcm_dma_request(struct snd_pcm_substream *substream)
 514 {
 515         struct snd_dma_buffer *iram_dma;
 516         struct davinci_runtime_data *prtd = substream->runtime->private_data;
 517         struct davinci_pcm_dma_params *params = prtd->params;
 518         int ret;
 519
 520         if (!params)
 521                 return -ENODEV;
 522
 523         /* Request asp master DMA channel */
 524         ret = prtd->asp_channel = edma_alloc_channel(params->channel,
 525                         davinci_pcm_dma_irq, substream,
 526                         prtd->params->asp_chan_q);
 527         if (ret < 0)
 528                 goto exit1;
 529
 530         /* Request asp link channels */
 531         ret = prtd->asp_link[0] = edma_alloc_slot(
 532                         EDMA_CTLR(prtd->asp_channel), EDMA_SLOT_ANY);
 533         if (ret < 0)
 534                 goto exit2;
 535
 536         iram_dma = (struct snd_dma_buffer *)substream->dma_buffer.private_data;
 537         if (iram_dma) {
 538                 if (request_ping_pong(substream, prtd, iram_dma) == 0)
 539                         return 0;
 540                 printk(KERN_WARNING "%s: dma channel allocation failed,"
 541                                 "not using sram\n", __func__);
 542         }
 543
 544         /* Issue transfer completion IRQ when the channel completes a
 545          * transfer, then always reload from the same slot (by a kind
 546          * of loopback link).  The completion IRQ handler will update
 547          * the reload slot with a new buffer.
 548          *
 549          * REVISIT save p_ram here after setting up everything except
 550          * the buffer and its length (ccnt) ... use it as a template
 551          * so davinci_pcm_enqueue_dma() takes less time in IRQ.
 552          */
 553         edma_read_slot(prtd->asp_link[0], &prtd->asp_params);
 554         prtd->asp_params.opt |= TCINTEN |
 555                 EDMA_TCC(EDMA_CHAN_SLOT(prtd->asp_channel));
 556         prtd->asp_params.link_bcntrld = EDMA_CHAN_SLOT(prtd->asp_link[0]) << 5;
 557         edma_write_slot(prtd->asp_link[0], &prtd->asp_params);
 558         return 0;
 559 exit2:
 560         edma_free_channel(prtd->asp_channel);
 561         prtd->asp_channel = -1;
 562 exit1:
 563         return ret;
 564 }
 565
 566 static int davinci_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 567 {
 568         struct davinci_runtime_data *prtd = substream->runtime->private_data;
 569         int ret = 0;
 570
 571         spin_lock(&prtd->lock);
 572
 573         switch (cmd) {
 574         case SNDRV_PCM_TRIGGER_START:
 575                 edma_start(prtd->asp_channel);
 576                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 577                     prtd->ram_channel >= 0) {
 578                         /* copy 1st iram buffer */
 579                         edma_start(prtd->ram_channel);
 580                 }
 581                 break;
 582         case SNDRV_PCM_TRIGGER_RESUME:
 583         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 584                 edma_resume(prtd->asp_channel);
 585                 break;
 586         case SNDRV_PCM_TRIGGER_STOP:
 587         case SNDRV_PCM_TRIGGER_SUSPEND:
 588         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 589                 edma_pause(prtd->asp_channel);
 590                 break;
 591         default:
 592                 ret = -EINVAL;
 593                 break;
 594         }
 595
 596         spin_unlock(&prtd->lock);
 597
 598         return ret;
 599 }
 600
 601 static int davinci_pcm_prepare(struct snd_pcm_substream *substream)
 602 {
 603         struct davinci_runtime_data *prtd = substream->runtime->private_data;
 604
 605         davinci_pcm_period_reset(substream);
 606         if (prtd->ram_channel >= 0) {
 607                 int ret = ping_pong_dma_setup(substream);
 608                 if (ret < 0)
 609                         return ret;
 610
 611                 edma_write_slot(prtd->ram_channel, &prtd->ram_params);
 612                 edma_write_slot(prtd->asp_channel, &prtd->asp_params);
 613
 614                 print_buf_info(prtd->ram_channel, "ram_channel");
 615                 print_buf_info(prtd->ram_link, "ram_link");
 616                 print_buf_info(prtd->ram_link2, "ram_link2");
 617                 print_buf_info(prtd->asp_channel, "asp_channel");
 618                 print_buf_info(prtd->asp_link[0], "asp_link[0]");
 619                 print_buf_info(prtd->asp_link[1], "asp_link[1]");
 620
 621                 /*
 622                  * There is a phase offset of 2 periods between the position
 623                  * used by dma setup and the position reported in the pointer
 624                  * function.
 625                  *
 626                  * The phase offset, when not using ping-pong buffers, is due to
 627                  * the two consecutive calls to davinci_pcm_enqueue_dma() below.
 628                  *
 629                  * Whereas here, with ping-pong buffers, the phase is due to
 630                  * there being an entire buffer transfer complete before the
 631                  * first dma completion event triggers davinci_pcm_dma_irq().
 632                  */
 633                 davinci_pcm_period_elapsed(substream);
 634                 davinci_pcm_period_elapsed(substream);
 635
 636                 return 0;
 637         }
 638         davinci_pcm_enqueue_dma(substream);
 639         davinci_pcm_period_elapsed(substream);
 640
 641         /* Copy self-linked parameter RAM entry into master channel */
 642         edma_read_slot(prtd->asp_link[0], &prtd->asp_params);
 643         edma_write_slot(prtd->asp_channel, &prtd->asp_params);
 644         davinci_pcm_enqueue_dma(substream);
 645         davinci_pcm_period_elapsed(substream);
 646
 647         return 0;
 648 }
 649
 650 static snd_pcm_uframes_t
 651 davinci_pcm_pointer(struct snd_pcm_substream *substream)
 652 {
 653         struct snd_pcm_runtime *runtime = substream->runtime;
 654         struct davinci_runtime_data *prtd = runtime->private_data;
 655         unsigned int offset;
 656         int asp_count;
 657         unsigned int period_size = snd_pcm_lib_period_bytes(substream);
 658
 659         /*
 660          * There is a phase offset of 2 periods between the position used by dma
 661          * setup and the position reported in the pointer function. Either +2 in
 662          * the dma setup or -2 here in the pointer function (with wrapping,
 663          * both) accounts for this offset -- choose the latter since it makes
 664          * the first-time setup clearer.
 665          */
 666         spin_lock(&prtd->lock);
 667         asp_count = prtd->period - 2;
 668         spin_unlock(&prtd->lock);
 669
 670         if (asp_count < 0)
 671                 asp_count += runtime->periods;
 672         asp_count *= period_size;
 673
 674         offset = bytes_to_frames(runtime, asp_count);
 675         if (offset >= runtime->buffer_size)
 676                 offset = 0;
 677
 678         return offset;
 679 }
 680
 681 static int davinci_pcm_open(struct snd_pcm_substream *substream)
 682 {
 683         struct snd_pcm_runtime *runtime = substream->runtime;
 684         struct davinci_runtime_data *prtd;
 685         struct snd_pcm_hardware *ppcm;
 686         int ret = 0;
 687         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 688         struct davinci_pcm_dma_params *pa;
 689         struct davinci_pcm_dma_params *params;
 690
 691         pa = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 692         if (!pa)
 693                 return -ENODEV;
 694         params = &pa[substream->stream];
 695
 696         ppcm = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
 697                         &pcm_hardware_playback : &pcm_hardware_capture;
 698         allocate_sram(substream, params->sram_pool, params->sram_size, ppcm);
 699         snd_soc_set_runtime_hwparams(substream, ppcm);
 700         /* ensure that buffer size is a multiple of period size */
 701         ret = snd_pcm_hw_constraint_integer(runtime,
 702                                                 SNDRV_PCM_HW_PARAM_PERIODS);
 703         if (ret < 0)
 704                 return ret;
 705
 706         prtd = kzalloc(sizeof(struct davinci_runtime_data), GFP_KERNEL);
 707         if (prtd == NULL)
 708                 return -ENOMEM;
 709
 710         spin_lock_init(&prtd->lock);
 711         prtd->params = params;
 712         prtd->asp_channel = -1;
 713         prtd->asp_link[0] = prtd->asp_link[1] = -1;
 714         prtd->ram_channel = -1;
 715         prtd->ram_link = -1;
 716         prtd->ram_link2 = -1;
 717
 718         runtime->private_data = prtd;
 719
 720         ret = davinci_pcm_dma_request(substream);
 721         if (ret) {
 722                 printk(KERN_ERR "davinci_pcm: Failed to get dma channels\n");
 723                 kfree(prtd);
 724         }
 725
 726         return ret;
 727 }
 728
 729 static int davinci_pcm_close(struct snd_pcm_substream *substream)
 730 {
 731         struct snd_pcm_runtime *runtime = substream->runtime;
 732         struct davinci_runtime_data *prtd = runtime->private_data;
 733
 734         if (prtd->ram_channel >= 0)
 735                 edma_stop(prtd->ram_channel);
 736         if (prtd->asp_channel >= 0)
 737                 edma_stop(prtd->asp_channel);
 738         if (prtd->asp_link[0] >= 0)
 739                 edma_unlink(prtd->asp_link[0]);
 740         if (prtd->asp_link[1] >= 0)
 741                 edma_unlink(prtd->asp_link[1]);
 742         if (prtd->ram_link >= 0)
 743                 edma_unlink(prtd->ram_link);
 744
 745         if (prtd->asp_link[0] >= 0)
 746                 edma_free_slot(prtd->asp_link[0]);
 747         if (prtd->asp_link[1] >= 0)
 748                 edma_free_slot(prtd->asp_link[1]);
 749         if (prtd->asp_channel >= 0)
 750                 edma_free_channel(prtd->asp_channel);
 751         if (prtd->ram_link >= 0)
 752                 edma_free_slot(prtd->ram_link);
 753         if (prtd->ram_link2 >= 0)
 754                 edma_free_slot(prtd->ram_link2);
 755         if (prtd->ram_channel >= 0)
 756                 edma_free_channel(prtd->ram_channel);
 757
 758         kfree(prtd);
 759
 760         return 0;
 761 }
 762
 763 static int davinci_pcm_hw_params(struct snd_pcm_substream *substream,
 764                                  struct snd_pcm_hw_params *hw_params)
 765 {
 766         return snd_pcm_lib_malloc_pages(substream,
 767                                         params_buffer_bytes(hw_params));
 768 }
 769
 770 static int davinci_pcm_hw_free(struct snd_pcm_substream *substream)
 771 {
 772         return snd_pcm_lib_free_pages(substream);
 773 }
 774
 775 static int davinci_pcm_mmap(struct snd_pcm_substream *substream,
 776                             struct vm_area_struct *vma)
 777 {
 778         struct snd_pcm_runtime *runtime = substream->runtime;
 779
 780         return dma_mmap_writecombine(substream->pcm->card->dev, vma,
 781                                      runtime->dma_area,
 782                                      runtime->dma_addr,
 783                                      runtime->dma_bytes);
 784 }
 785
 786 static struct snd_pcm_ops davinci_pcm_ops = {
 787         .open =         davinci_pcm_open,
 788         .close =        davinci_pcm_close,
 789         .ioctl =        snd_pcm_lib_ioctl,
 790         .hw_params =    davinci_pcm_hw_params,
 791         .hw_free =      davinci_pcm_hw_free,
 792         .prepare =      davinci_pcm_prepare,
 793         .trigger =      davinci_pcm_trigger,
 794         .pointer =      davinci_pcm_pointer,
 795         .mmap =         davinci_pcm_mmap,
 796 };
 797
 798 static int davinci_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream,
 799                 size_t size)
 800 {
 801         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 802         struct snd_dma_buffer *buf = &substream->dma_buffer;
 803
 804         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 805         buf->dev.dev = pcm->card->dev;
 806         buf->private_data = NULL;
 807         buf->area = dma_alloc_writecombine(pcm->card->dev, size,
 808                                            &buf->addr, GFP_KERNEL);
 809
 810         pr_debug("davinci_pcm: preallocate_dma_buffer: area=%p, addr=%p, "
 811                 "size=%d\n", (void *) buf->area, (void *) buf->addr, size);
 812
 813         if (!buf->area)
 814                 return -ENOMEM;
 815
 816         buf->bytes = size;
 817         return 0;
 818 }
 819
 820 static void davinci_pcm_free(struct snd_pcm *pcm)
 821 {
 822         struct snd_pcm_substream *substream;
 823         struct snd_dma_buffer *buf;
 824         int stream;
 825
 826         for (stream = 0; stream < 2; stream++) {
 827                 struct snd_dma_buffer *iram_dma;
 828                 substream = pcm->streams[stream].substream;
 829                 if (!substream)
 830                         continue;
 831
 832                 buf = &substream->dma_buffer;
 833                 if (!buf->area)
 834                         continue;
 835
 836                 dma_free_writecombine(pcm->card->dev, buf->bytes,
 837                                       buf->area, buf->addr);
 838                 buf->area = NULL;
 839                 iram_dma = buf->private_data;
 840                 if (iram_dma) {
 841                         davinci_free_sram(substream, iram_dma);
 842                         kfree(iram_dma);
 843                 }
 844         }
 845 }
 846
 847 static u64 davinci_pcm_dmamask = DMA_BIT_MASK(32);
 848
 849 static int davinci_pcm_new(struct snd_soc_pcm_runtime *rtd)
 850 {
 851         struct snd_card *card = rtd->card->snd_card;
 852         struct snd_pcm *pcm = rtd->pcm;
 853         int ret;
 854
 855         if (!card->dev->dma_mask)
 856                 card->dev->dma_mask = &davinci_pcm_dmamask;
 857         if (!card->dev->coherent_dma_mask)
 858                 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
 859
 860         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
 861                 ret = davinci_pcm_preallocate_dma_buffer(pcm,
 862                         SNDRV_PCM_STREAM_PLAYBACK,
 863                         pcm_hardware_playback.buffer_bytes_max);
 864                 if (ret)
 865                         return ret;
 866         }
 867
 868         if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
 869                 ret = davinci_pcm_preallocate_dma_buffer(pcm,
 870                         SNDRV_PCM_STREAM_CAPTURE,
 871                         pcm_hardware_capture.buffer_bytes_max);
 872                 if (ret)
 873                         return ret;
 874         }
 875
 876         return 0;
 877 }
 878
 879 static struct snd_soc_platform_driver davinci_soc_platform = {
 880         .ops =          &davinci_pcm_ops,
 881         .pcm_new =      davinci_pcm_new,
 882         .pcm_free =     davinci_pcm_free,
 883 };
 884
 885 int davinci_soc_platform_register(struct device *dev)
 886 {
 887         return snd_soc_register_platform(dev, &davinci_soc_platform);
 888 }
 889 EXPORT_SYMBOL_GPL(davinci_soc_platform_register);
 890
 891 void davinci_soc_platform_unregister(struct device *dev)
 892 {
 893         snd_soc_unregister_platform(dev);
 894 }
 895 EXPORT_SYMBOL_GPL(davinci_soc_platform_unregister);
 896
 897 MODULE_AUTHOR("Vladimir Barinov");
 898 MODULE_DESCRIPTION("TI DAVINCI PCM DMA module");
 899 MODULE_LICENSE("GPL");