sound/soc/qcom/lpass-platform.c

   1 /*
   2  * Copyright (c) 2010-2011,2013-2015 The Linux Foundation. All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 and
   6  * only version 2 as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * lpass-platform.c -- ALSA SoC platform driver for QTi LPASS
  14  */
  15
  16 #include <linux/dma-mapping.h>
  17 #include <linux/export.h>
  18 #include <linux/kernel.h>
  19 #include <linux/module.h>
  20 #include <linux/platform_device.h>
  21 #include <sound/pcm_params.h>
  22 #include <linux/regmap.h>
  23 #include <sound/soc.h>
  24 #include "lpass-lpaif-reg.h"
  25 #include "lpass.h"
  26
  27 struct lpass_pcm_data {
  28         int rdma_ch;
  29         int wrdma_ch;
  30         int i2s_port;
  31 };
  32
  33 #define LPASS_PLATFORM_BUFFER_SIZE      (16 * 1024)
  34 #define LPASS_PLATFORM_PERIODS          2
  35
  36 static struct snd_pcm_hardware lpass_platform_pcm_hardware = {
  37         .info                   =       SNDRV_PCM_INFO_MMAP |
  38                                         SNDRV_PCM_INFO_MMAP_VALID |
  39                                         SNDRV_PCM_INFO_INTERLEAVED |
  40                                         SNDRV_PCM_INFO_PAUSE |
  41                                         SNDRV_PCM_INFO_RESUME,
  42         .formats                =       SNDRV_PCM_FMTBIT_S16 |
  43                                         SNDRV_PCM_FMTBIT_S24 |
  44                                         SNDRV_PCM_FMTBIT_S32,
  45         .rates                  =       SNDRV_PCM_RATE_8000_192000,
  46         .rate_min               =       8000,
  47         .rate_max               =       192000,
  48         .channels_min           =       1,
  49         .channels_max           =       8,
  50         .buffer_bytes_max       =       LPASS_PLATFORM_BUFFER_SIZE,
  51         .period_bytes_max       =       LPASS_PLATFORM_BUFFER_SIZE /
  52                                                 LPASS_PLATFORM_PERIODS,
  53         .period_bytes_min       =       LPASS_PLATFORM_BUFFER_SIZE /
  54                                                 LPASS_PLATFORM_PERIODS,
  55         .periods_min            =       LPASS_PLATFORM_PERIODS,
  56         .periods_max            =       LPASS_PLATFORM_PERIODS,
  57         .fifo_size              =       0,
  58 };
  59
  60 static int lpass_platform_pcmops_open(struct snd_pcm_substream *substream)
  61 {
  62         struct snd_pcm_runtime *runtime = substream->runtime;
  63         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
  64         int ret;
  65
  66         snd_soc_set_runtime_hwparams(substream, &lpass_platform_pcm_hardware);
  67
  68         runtime->dma_bytes = lpass_platform_pcm_hardware.buffer_bytes_max;
  69
  70         ret = snd_pcm_hw_constraint_integer(runtime,
  71                         SNDRV_PCM_HW_PARAM_PERIODS);
  72         if (ret < 0) {
  73                 dev_err(soc_runtime->dev, "%s() setting constraints failed: %d\n",
  74                                 __func__, ret);
  75                 return -EINVAL;
  76         }
  77
  78         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
  79
  80         return 0;
  81 }
  82
  83 static int lpass_platform_pcmops_hw_params(struct snd_pcm_substream *substream,
  84                 struct snd_pcm_hw_params *params)
  85 {
  86         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
  87         struct lpass_data *drvdata =
  88                 snd_soc_platform_get_drvdata(soc_runtime->platform);
  89         struct lpass_pcm_data *pcm_data = drvdata->private_data;
  90         struct lpass_variant *v = drvdata->variant;
  91         snd_pcm_format_t format = params_format(params);
  92         unsigned int channels = params_channels(params);
  93         unsigned int regval;
  94         int ch, dir = substream->stream;
  95         int bitwidth;
  96         int ret, dma_port = pcm_data->i2s_port + v->dmactl_audif_start;
  97
  98         if (dir ==  SNDRV_PCM_STREAM_PLAYBACK)
  99                 ch = pcm_data->rdma_ch;
 100         else
 101                 ch = pcm_data->wrdma_ch;
 102
 103         bitwidth = snd_pcm_format_width(format);
 104         if (bitwidth < 0) {
 105                 dev_err(soc_runtime->dev, "%s() invalid bit width given: %d\n",
 106                                 __func__, bitwidth);
 107                 return bitwidth;
 108         }
 109
 110         regval = LPAIF_DMACTL_BURSTEN_INCR4 |
 111                         LPAIF_DMACTL_AUDINTF(dma_port) |
 112                         LPAIF_DMACTL_FIFOWM_8;
 113
 114         switch (bitwidth) {
 115         case 16:
 116                 switch (channels) {
 117                 case 1:
 118                 case 2:
 119                         regval |= LPAIF_DMACTL_WPSCNT_ONE;
 120                         break;
 121                 case 4:
 122                         regval |= LPAIF_DMACTL_WPSCNT_TWO;
 123                         break;
 124                 case 6:
 125                         regval |= LPAIF_DMACTL_WPSCNT_THREE;
 126                         break;
 127                 case 8:
 128                         regval |= LPAIF_DMACTL_WPSCNT_FOUR;
 129                         break;
 130                 default:
 131                         dev_err(soc_runtime->dev, "%s() invalid PCM config given: bw=%d, ch=%u\n",
 132                                         __func__, bitwidth, channels);
 133                         return -EINVAL;
 134                 }
 135                 break;
 136         case 24:
 137         case 32:
 138                 switch (channels) {
 139                 case 1:
 140                         regval |= LPAIF_DMACTL_WPSCNT_ONE;
 141                         break;
 142                 case 2:
 143                         regval |= LPAIF_DMACTL_WPSCNT_TWO;
 144                         break;
 145                 case 4:
 146                         regval |= LPAIF_DMACTL_WPSCNT_FOUR;
 147                         break;
 148                 case 6:
 149                         regval |= LPAIF_DMACTL_WPSCNT_SIX;
 150                         break;
 151                 case 8:
 152                         regval |= LPAIF_DMACTL_WPSCNT_EIGHT;
 153                         break;
 154                 default:
 155                         dev_err(soc_runtime->dev, "%s() invalid PCM config given: bw=%d, ch=%u\n",
 156                                         __func__, bitwidth, channels);
 157                         return -EINVAL;
 158                 }
 159                 break;
 160         default:
 161                 dev_err(soc_runtime->dev, "%s() invalid PCM config given: bw=%d, ch=%u\n",
 162                                 __func__, bitwidth, channels);
 163                 return -EINVAL;
 164         }
 165
 166         ret = regmap_write(drvdata->lpaif_map,
 167                         LPAIF_DMACTL_REG(v, ch, dir), regval);
 168         if (ret) {
 169                 dev_err(soc_runtime->dev, "%s() error writing to rdmactl reg: %d\n",
 170                                 __func__, ret);
 171                 return ret;
 172         }
 173
 174         return 0;
 175 }
 176
 177 static int lpass_platform_pcmops_hw_free(struct snd_pcm_substream *substream)
 178 {
 179         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
 180         struct lpass_data *drvdata =
 181                 snd_soc_platform_get_drvdata(soc_runtime->platform);
 182         struct lpass_pcm_data *pcm_data = drvdata->private_data;
 183         struct lpass_variant *v = drvdata->variant;
 184         unsigned int reg;
 185         int ret;
 186
 187         if (substream->stream ==  SNDRV_PCM_STREAM_PLAYBACK)
 188                 reg = LPAIF_RDMACTL_REG(v, pcm_data->rdma_ch);
 189         else
 190                 reg = LPAIF_WRDMACTL_REG(v, pcm_data->wrdma_ch);
 191
 192         ret = regmap_write(drvdata->lpaif_map, reg, 0);
 193         if (ret)
 194                 dev_err(soc_runtime->dev, "%s() error writing to rdmactl reg: %d\n",
 195                                 __func__, ret);
 196
 197         return ret;
 198 }
 199
 200 static int lpass_platform_pcmops_prepare(struct snd_pcm_substream *substream)
 201 {
 202         struct snd_pcm_runtime *runtime = substream->runtime;
 203         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
 204         struct lpass_data *drvdata =
 205                 snd_soc_platform_get_drvdata(soc_runtime->platform);
 206         struct lpass_pcm_data *pcm_data = drvdata->private_data;
 207         struct lpass_variant *v = drvdata->variant;
 208         int ret, ch, dir = substream->stream;
 209
 210         if (dir ==  SNDRV_PCM_STREAM_PLAYBACK)
 211                 ch = pcm_data->rdma_ch;
 212         else
 213                 ch = pcm_data->wrdma_ch;
 214
 215         ret = regmap_write(drvdata->lpaif_map,
 216                         LPAIF_DMABASE_REG(v, ch, dir),
 217                         runtime->dma_addr);
 218         if (ret) {
 219                 dev_err(soc_runtime->dev, "%s() error writing to rdmabase reg: %d\n",
 220                                 __func__, ret);
 221                 return ret;
 222         }
 223
 224         ret = regmap_write(drvdata->lpaif_map,
 225                         LPAIF_DMABUFF_REG(v, ch, dir),
 226                         (snd_pcm_lib_buffer_bytes(substream) >> 2) - 1);
 227         if (ret) {
 228                 dev_err(soc_runtime->dev, "%s() error writing to rdmabuff reg: %d\n",
 229                                 __func__, ret);
 230                 return ret;
 231         }
 232
 233         ret = regmap_write(drvdata->lpaif_map,
 234                         LPAIF_DMAPER_REG(v, ch, dir),
 235                         (snd_pcm_lib_period_bytes(substream) >> 2) - 1);
 236         if (ret) {
 237                 dev_err(soc_runtime->dev, "%s() error writing to rdmaper reg: %d\n",
 238                                 __func__, ret);
 239                 return ret;
 240         }
 241
 242         ret = regmap_update_bits(drvdata->lpaif_map,
 243                         LPAIF_DMACTL_REG(v, ch, dir),
 244                         LPAIF_DMACTL_ENABLE_MASK, LPAIF_DMACTL_ENABLE_ON);
 245         if (ret) {
 246                 dev_err(soc_runtime->dev, "%s() error writing to rdmactl reg: %d\n",
 247                                 __func__, ret);
 248                 return ret;
 249         }
 250
 251         return 0;
 252 }
 253
 254 static int lpass_platform_pcmops_trigger(struct snd_pcm_substream *substream,
 255                 int cmd)
 256 {
 257         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
 258         struct lpass_data *drvdata =
 259                 snd_soc_platform_get_drvdata(soc_runtime->platform);
 260         struct lpass_pcm_data *pcm_data = drvdata->private_data;
 261         struct lpass_variant *v = drvdata->variant;
 262         int ret, ch, dir = substream->stream;
 263
 264         if (dir == SNDRV_PCM_STREAM_PLAYBACK)
 265                 ch = pcm_data->rdma_ch;
 266         else
 267                 ch = pcm_data->wrdma_ch;
 268
 269         switch (cmd) {
 270         case SNDRV_PCM_TRIGGER_START:
 271         case SNDRV_PCM_TRIGGER_RESUME:
 272         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 273                 /* clear status before enabling interrupts */
 274                 ret = regmap_write(drvdata->lpaif_map,
 275                                 LPAIF_IRQCLEAR_REG(v, LPAIF_IRQ_PORT_HOST),
 276                                 LPAIF_IRQ_ALL(ch));
 277                 if (ret) {
 278                         dev_err(soc_runtime->dev, "%s() error writing to irqclear reg: %d\n",
 279                                         __func__, ret);
 280                         return ret;
 281                 }
 282
 283                 ret = regmap_update_bits(drvdata->lpaif_map,
 284                                 LPAIF_IRQEN_REG(v, LPAIF_IRQ_PORT_HOST),
 285                                 LPAIF_IRQ_ALL(ch),
 286                                 LPAIF_IRQ_ALL(ch));
 287                 if (ret) {
 288                         dev_err(soc_runtime->dev, "%s() error writing to irqen reg: %d\n",
 289                                         __func__, ret);
 290                         return ret;
 291                 }
 292
 293                 ret = regmap_update_bits(drvdata->lpaif_map,
 294                                 LPAIF_DMACTL_REG(v, ch, dir),
 295                                 LPAIF_DMACTL_ENABLE_MASK,
 296                                 LPAIF_DMACTL_ENABLE_ON);
 297                 if (ret) {
 298                         dev_err(soc_runtime->dev, "%s() error writing to rdmactl reg: %d\n",
 299                                         __func__, ret);
 300                         return ret;
 301                 }
 302                 break;
 303         case SNDRV_PCM_TRIGGER_STOP:
 304         case SNDRV_PCM_TRIGGER_SUSPEND:
 305         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 306                 ret = regmap_update_bits(drvdata->lpaif_map,
 307                                 LPAIF_DMACTL_REG(v, ch, dir),
 308                                 LPAIF_DMACTL_ENABLE_MASK,
 309                                 LPAIF_DMACTL_ENABLE_OFF);
 310                 if (ret) {
 311                         dev_err(soc_runtime->dev, "%s() error writing to rdmactl reg: %d\n",
 312                                         __func__, ret);
 313                         return ret;
 314                 }
 315
 316                 ret = regmap_update_bits(drvdata->lpaif_map,
 317                                 LPAIF_IRQEN_REG(v, LPAIF_IRQ_PORT_HOST),
 318                                 LPAIF_IRQ_ALL(ch), 0);
 319                 if (ret) {
 320                         dev_err(soc_runtime->dev, "%s() error writing to irqen reg: %d\n",
 321                                         __func__, ret);
 322                         return ret;
 323                 }
 324                 break;
 325         }
 326
 327         return 0;
 328 }
 329
 330 static snd_pcm_uframes_t lpass_platform_pcmops_pointer(
 331                 struct snd_pcm_substream *substream)
 332 {
 333         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
 334         struct lpass_data *drvdata =
 335                         snd_soc_platform_get_drvdata(soc_runtime->platform);
 336         struct lpass_pcm_data *pcm_data = drvdata->private_data;
 337         struct lpass_variant *v = drvdata->variant;
 338         unsigned int base_addr, curr_addr;
 339         int ret, ch, dir = substream->stream;
 340
 341         if (dir == SNDRV_PCM_STREAM_PLAYBACK)
 342                 ch = pcm_data->rdma_ch;
 343         else
 344                 ch = pcm_data->wrdma_ch;
 345
 346         ret = regmap_read(drvdata->lpaif_map,
 347                         LPAIF_DMABASE_REG(v, ch, dir), &base_addr);
 348         if (ret) {
 349                 dev_err(soc_runtime->dev, "%s() error reading from rdmabase reg: %d\n",
 350                                 __func__, ret);
 351                 return ret;
 352         }
 353
 354         ret = regmap_read(drvdata->lpaif_map,
 355                         LPAIF_DMACURR_REG(v, ch, dir), &curr_addr);
 356         if (ret) {
 357                 dev_err(soc_runtime->dev, "%s() error reading from rdmacurr reg: %d\n",
 358                                 __func__, ret);
 359                 return ret;
 360         }
 361
 362         return bytes_to_frames(substream->runtime, curr_addr - base_addr);
 363 }
 364
 365 static int lpass_platform_pcmops_mmap(struct snd_pcm_substream *substream,
 366                 struct vm_area_struct *vma)
 367 {
 368         struct snd_pcm_runtime *runtime = substream->runtime;
 369
 370         return dma_mmap_coherent(substream->pcm->card->dev, vma,
 371                         runtime->dma_area, runtime->dma_addr,
 372                         runtime->dma_bytes);
 373 }
 374
 375 static const struct snd_pcm_ops lpass_platform_pcm_ops = {
 376         .open           = lpass_platform_pcmops_open,
 377         .ioctl          = snd_pcm_lib_ioctl,
 378         .hw_params      = lpass_platform_pcmops_hw_params,
 379         .hw_free        = lpass_platform_pcmops_hw_free,
 380         .prepare        = lpass_platform_pcmops_prepare,
 381         .trigger        = lpass_platform_pcmops_trigger,
 382         .pointer        = lpass_platform_pcmops_pointer,
 383         .mmap           = lpass_platform_pcmops_mmap,
 384 };
 385
 386 static irqreturn_t lpass_dma_interrupt_handler(
 387                         struct snd_pcm_substream *substream,
 388                         struct lpass_data *drvdata,
 389                         int chan, u32 interrupts)
 390 {
 391         struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
 392         struct lpass_variant *v = drvdata->variant;
 393         irqreturn_t ret = IRQ_NONE;
 394         int rv;
 395
 396         if (interrupts & LPAIF_IRQ_PER(chan)) {
 397                 rv = regmap_write(drvdata->lpaif_map,
 398                                 LPAIF_IRQCLEAR_REG(v, LPAIF_IRQ_PORT_HOST),
 399                                 LPAIF_IRQ_PER(chan));
 400                 if (rv) {
 401                         dev_err(soc_runtime->dev, "%s() error writing to irqclear reg: %d\n",
 402                                         __func__, rv);
 403                         return IRQ_NONE;
 404                 }
 405                 snd_pcm_period_elapsed(substream);
 406                 ret = IRQ_HANDLED;
 407         }
 408
 409         if (interrupts & LPAIF_IRQ_XRUN(chan)) {
 410                 rv = regmap_write(drvdata->lpaif_map,
 411                                 LPAIF_IRQCLEAR_REG(v, LPAIF_IRQ_PORT_HOST),
 412                                 LPAIF_IRQ_XRUN(chan));
 413                 if (rv) {
 414                         dev_err(soc_runtime->dev, "%s() error writing to irqclear reg: %d\n",
 415                                         __func__, rv);
 416                         return IRQ_NONE;
 417                 }
 418                 dev_warn(soc_runtime->dev, "%s() xrun warning\n", __func__);
 419                 snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
 420                 ret = IRQ_HANDLED;
 421         }
 422
 423         if (interrupts & LPAIF_IRQ_ERR(chan)) {
 424                 rv = regmap_write(drvdata->lpaif_map,
 425                                 LPAIF_IRQCLEAR_REG(v, LPAIF_IRQ_PORT_HOST),
 426                                 LPAIF_IRQ_ERR(chan));
 427                 if (rv) {
 428                         dev_err(soc_runtime->dev, "%s() error writing to irqclear reg: %d\n",
 429                                         __func__, rv);
 430                         return IRQ_NONE;
 431                 }
 432                 dev_err(soc_runtime->dev, "%s() bus access error\n", __func__);
 433                 snd_pcm_stop(substream, SNDRV_PCM_STATE_DISCONNECTED);
 434                 ret = IRQ_HANDLED;
 435         }
 436
 437         return ret;
 438 }
 439
 440 static irqreturn_t lpass_platform_lpaif_irq(int irq, void *data)
 441 {
 442         struct lpass_data *drvdata = data;
 443         struct lpass_variant *v = drvdata->variant;
 444         unsigned int irqs;
 445         int rv, chan;
 446
 447         rv = regmap_read(drvdata->lpaif_map,
 448                         LPAIF_IRQSTAT_REG(v, LPAIF_IRQ_PORT_HOST), &irqs);
 449         if (rv) {
 450                 pr_err("%s() error reading from irqstat reg: %d\n",
 451                                 __func__, rv);
 452                 return IRQ_NONE;
 453         }
 454
 455         /* Handle per channel interrupts */
 456         for (chan = 0; chan < LPASS_MAX_DMA_CHANNELS; chan++) {
 457                 if (irqs & LPAIF_IRQ_ALL(chan) && drvdata->substream[chan]) {
 458                         rv = lpass_dma_interrupt_handler(
 459                                                 drvdata->substream[chan],
 460                                                 drvdata, chan, irqs);
 461                         if (rv != IRQ_HANDLED)
 462                                 return rv;
 463                 }
 464         }
 465
 466         return IRQ_HANDLED;
 467 }
 468
 469 static int lpass_platform_pcm_new(struct snd_soc_pcm_runtime *soc_runtime)
 470 {
 471         struct snd_pcm *pcm = soc_runtime->pcm;
 472         struct snd_pcm_substream *psubstream, *csubstream;
 473         struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai;
 474         struct lpass_data *drvdata =
 475                 snd_soc_platform_get_drvdata(soc_runtime->platform);
 476         struct lpass_variant *v = drvdata->variant;
 477         int ret = -EINVAL;
 478         struct lpass_pcm_data *data;
 479         size_t size = lpass_platform_pcm_hardware.buffer_bytes_max;
 480
 481         data = devm_kzalloc(soc_runtime->dev, sizeof(*data), GFP_KERNEL);
 482         if (!data)
 483                 return -ENOMEM;
 484
 485         data->i2s_port = cpu_dai->driver->id;
 486         drvdata->private_data = data;
 487
 488         psubstream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
 489         if (psubstream) {
 490                 if (v->alloc_dma_channel)
 491                         data->rdma_ch = v->alloc_dma_channel(drvdata,
 492                                                 SNDRV_PCM_STREAM_PLAYBACK);
 493
 494                 if (data->rdma_ch < 0)
 495                         return data->rdma_ch;
 496
 497                 drvdata->substream[data->rdma_ch] = psubstream;
 498
 499                 ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV,
 500                                         soc_runtime->platform->dev,
 501                                         size, &psubstream->dma_buffer);
 502                 if (ret)
 503                         goto playback_alloc_err;
 504
 505                 ret = regmap_write(drvdata->lpaif_map,
 506                         LPAIF_RDMACTL_REG(v, data->rdma_ch), 0);
 507                 if (ret) {
 508                         dev_err(soc_runtime->dev,
 509                                 "%s() error writing to rdmactl reg: %d\n",
 510                                 __func__, ret);
 511                         goto capture_alloc_err;
 512                 }
 513         }
 514
 515         csubstream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
 516         if (csubstream) {
 517                 if (v->alloc_dma_channel)
 518                         data->wrdma_ch = v->alloc_dma_channel(drvdata,
 519                                                 SNDRV_PCM_STREAM_CAPTURE);
 520
 521                 if (data->wrdma_ch < 0) {
 522                         ret = data->wrdma_ch;
 523                         goto capture_alloc_err;
 524                 }
 525
 526                 drvdata->substream[data->wrdma_ch] = csubstream;
 527
 528                 ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV,
 529                                         soc_runtime->platform->dev,
 530                                         size, &csubstream->dma_buffer);
 531                 if (ret)
 532                         goto capture_alloc_err;
 533
 534                 ret = regmap_write(drvdata->lpaif_map,
 535                         LPAIF_WRDMACTL_REG(v, data->wrdma_ch), 0);
 536                 if (ret) {
 537                         dev_err(soc_runtime->dev,
 538                                 "%s() error writing to wrdmactl reg: %d\n",
 539                                 __func__, ret);
 540                         goto capture_reg_err;
 541                 }
 542         }
 543
 544         return 0;
 545
 546 capture_reg_err:
 547         if (csubstream)
 548                 snd_dma_free_pages(&csubstream->dma_buffer);
 549
 550 capture_alloc_err:
 551         if (psubstream)
 552                 snd_dma_free_pages(&psubstream->dma_buffer);
 553
 554  playback_alloc_err:
 555         dev_err(soc_runtime->dev, "Cannot allocate buffer(s)\n");
 556
 557         return ret;
 558 }
 559
 560 static void lpass_platform_pcm_free(struct snd_pcm *pcm)
 561 {
 562         struct snd_soc_pcm_runtime *rt;
 563         struct lpass_data *drvdata;
 564         struct lpass_pcm_data *data;
 565         struct lpass_variant *v;
 566         struct snd_pcm_substream *substream;
 567         int ch, i;
 568
 569         for (i = 0; i < ARRAY_SIZE(pcm->streams); i++) {
 570                 substream = pcm->streams[i].substream;
 571                 if (substream) {
 572                         rt = substream->private_data;
 573                         drvdata = snd_soc_platform_get_drvdata(rt->platform);
 574                         data = drvdata->private_data;
 575
 576                         ch = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 577                                 ? data->rdma_ch
 578                                 : data->wrdma_ch;
 579                         v = drvdata->variant;
 580                         drvdata->substream[ch] = NULL;
 581                         if (v->free_dma_channel)
 582                                 v->free_dma_channel(drvdata, ch);
 583
 584                         snd_dma_free_pages(&substream->dma_buffer);
 585                         substream->dma_buffer.area = NULL;
 586                         substream->dma_buffer.addr = 0;
 587                 }
 588         }
 589 }
 590
 591 static struct snd_soc_platform_driver lpass_platform_driver = {
 592         .pcm_new        = lpass_platform_pcm_new,
 593         .pcm_free       = lpass_platform_pcm_free,
 594         .ops            = &lpass_platform_pcm_ops,
 595 };
 596
 597 int asoc_qcom_lpass_platform_register(struct platform_device *pdev)
 598 {
 599         struct lpass_data *drvdata = platform_get_drvdata(pdev);
 600         struct lpass_variant *v = drvdata->variant;
 601         int ret;
 602
 603         drvdata->lpaif_irq = platform_get_irq_byname(pdev, "lpass-irq-lpaif");
 604         if (drvdata->lpaif_irq < 0) {
 605                 dev_err(&pdev->dev, "%s() error getting irq handle: %d\n",
 606                                 __func__, drvdata->lpaif_irq);
 607                 return -ENODEV;
 608         }
 609
 610         /* ensure audio hardware is disabled */
 611         ret = regmap_write(drvdata->lpaif_map,
 612                         LPAIF_IRQEN_REG(v, LPAIF_IRQ_PORT_HOST), 0);
 613         if (ret) {
 614                 dev_err(&pdev->dev, "%s() error writing to irqen reg: %d\n",
 615                                 __func__, ret);
 616                 return ret;
 617         }
 618
 619         ret = devm_request_irq(&pdev->dev, drvdata->lpaif_irq,
 620                         lpass_platform_lpaif_irq, IRQF_TRIGGER_RISING,
 621                         "lpass-irq-lpaif", drvdata);
 622         if (ret) {
 623                 dev_err(&pdev->dev, "%s() irq request failed: %d\n",
 624                                 __func__, ret);
 625                 return ret;
 626         }
 627
 628
 629         return devm_snd_soc_register_platform(&pdev->dev,
 630                         &lpass_platform_driver);
 631 }
 632 EXPORT_SYMBOL_GPL(asoc_qcom_lpass_platform_register);
 633
 634 MODULE_DESCRIPTION("QTi LPASS Platform Driver");
 635 MODULE_LICENSE("GPL v2");