sound/soc/amd/raven/acp3x-pcm-dma.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 //
   3 // AMD ALSA SoC PCM Driver
   4 //
   5 //Copyright 2016 Advanced Micro Devices, Inc.
   6
   7 #include <linux/platform_device.h>
   8 #include <linux/module.h>
   9 #include <linux/err.h>
  10 #include <linux/io.h>
  11 #include <linux/pm_runtime.h>
  12 #include <sound/pcm_params.h>
  13 #include <sound/soc.h>
  14 #include <sound/soc-dai.h>
  15
  16 #include "acp3x.h"
  17
  18 #define DRV_NAME "acp3x-i2s-audio"
  19
  20 static const struct snd_pcm_hardware acp3x_pcm_hardware_playback = {
  21         .info = SNDRV_PCM_INFO_INTERLEAVED |
  22                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
  23                 SNDRV_PCM_INFO_BATCH |
  24                 SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
  25                 SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME,
  26         .formats = SNDRV_PCM_FMTBIT_S16_LE |  SNDRV_PCM_FMTBIT_S8 |
  27                    SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S24_LE |
  28                    SNDRV_PCM_FMTBIT_S32_LE,
  29         .channels_min = 2,
  30         .channels_max = 8,
  31         .rates = SNDRV_PCM_RATE_8000_96000,
  32         .rate_min = 8000,
  33         .rate_max = 96000,
  34         .buffer_bytes_max = PLAYBACK_MAX_NUM_PERIODS * PLAYBACK_MAX_PERIOD_SIZE,
  35         .period_bytes_min = PLAYBACK_MIN_PERIOD_SIZE,
  36         .period_bytes_max = PLAYBACK_MAX_PERIOD_SIZE,
  37         .periods_min = PLAYBACK_MIN_NUM_PERIODS,
  38         .periods_max = PLAYBACK_MAX_NUM_PERIODS,
  39 };
  40
  41 static const struct snd_pcm_hardware acp3x_pcm_hardware_capture = {
  42         .info = SNDRV_PCM_INFO_INTERLEAVED |
  43                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
  44                 SNDRV_PCM_INFO_BATCH |
  45                 SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
  46                 SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME,
  47         .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S8 |
  48                    SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S24_LE |
  49                    SNDRV_PCM_FMTBIT_S32_LE,
  50         .channels_min = 2,
  51         .channels_max = 2,
  52         .rates = SNDRV_PCM_RATE_8000_48000,
  53         .rate_min = 8000,
  54         .rate_max = 48000,
  55         .buffer_bytes_max = CAPTURE_MAX_NUM_PERIODS * CAPTURE_MAX_PERIOD_SIZE,
  56         .period_bytes_min = CAPTURE_MIN_PERIOD_SIZE,
  57         .period_bytes_max = CAPTURE_MAX_PERIOD_SIZE,
  58         .periods_min = CAPTURE_MIN_NUM_PERIODS,
  59         .periods_max = CAPTURE_MAX_NUM_PERIODS,
  60 };
  61
  62 static irqreturn_t i2s_irq_handler(int irq, void *dev_id)
  63 {
  64         struct i2s_dev_data *rv_i2s_data;
  65         u16 play_flag, cap_flag;
  66         u32 val;
  67
  68         rv_i2s_data = dev_id;
  69         if (!rv_i2s_data)
  70                 return IRQ_NONE;
  71
  72         play_flag = 0;
  73         cap_flag = 0;
  74         val = rv_readl(rv_i2s_data->acp3x_base + mmACP_EXTERNAL_INTR_STAT);
  75         if ((val & BIT(BT_TX_THRESHOLD)) && rv_i2s_data->play_stream) {
  76                 rv_writel(BIT(BT_TX_THRESHOLD), rv_i2s_data->acp3x_base +
  77                           mmACP_EXTERNAL_INTR_STAT);
  78                 snd_pcm_period_elapsed(rv_i2s_data->play_stream);
  79                 play_flag = 1;
  80         }
  81         if ((val & BIT(I2S_TX_THRESHOLD)) &&
  82                                 rv_i2s_data->i2ssp_play_stream) {
  83                 rv_writel(BIT(I2S_TX_THRESHOLD),
  84                         rv_i2s_data->acp3x_base + mmACP_EXTERNAL_INTR_STAT);
  85                 snd_pcm_period_elapsed(rv_i2s_data->i2ssp_play_stream);
  86                 play_flag = 1;
  87         }
  88
  89         if ((val & BIT(BT_RX_THRESHOLD)) && rv_i2s_data->capture_stream) {
  90                 rv_writel(BIT(BT_RX_THRESHOLD), rv_i2s_data->acp3x_base +
  91                           mmACP_EXTERNAL_INTR_STAT);
  92                 snd_pcm_period_elapsed(rv_i2s_data->capture_stream);
  93                 cap_flag = 1;
  94         }
  95         if ((val & BIT(I2S_RX_THRESHOLD)) &&
  96                                 rv_i2s_data->i2ssp_capture_stream) {
  97                 rv_writel(BIT(I2S_RX_THRESHOLD),
  98                          rv_i2s_data->acp3x_base + mmACP_EXTERNAL_INTR_STAT);
  99                 snd_pcm_period_elapsed(rv_i2s_data->i2ssp_capture_stream);
 100                 cap_flag = 1;
 101         }
 102
 103         if (play_flag | cap_flag)
 104                 return IRQ_HANDLED;
 105         else
 106                 return IRQ_NONE;
 107 }
 108
 109 static void config_acp3x_dma(struct i2s_stream_instance *rtd, int direction)
 110 {
 111         u16 page_idx;
 112         u32 low, high, val, acp_fifo_addr, reg_fifo_addr;
 113         u32 reg_ringbuf_size, reg_dma_size, reg_fifo_size;
 114         dma_addr_t addr;
 115
 116         addr = rtd->dma_addr;
 117
 118         if (direction == SNDRV_PCM_STREAM_PLAYBACK) {
 119                 switch (rtd->i2s_instance) {
 120                 case I2S_BT_INSTANCE:
 121                         val = ACP_SRAM_BT_PB_PTE_OFFSET;
 122                         break;
 123                 case I2S_SP_INSTANCE:
 124                 default:
 125                         val = ACP_SRAM_SP_PB_PTE_OFFSET;
 126                 }
 127         } else {
 128                 switch (rtd->i2s_instance) {
 129                 case I2S_BT_INSTANCE:
 130                         val = ACP_SRAM_BT_CP_PTE_OFFSET;
 131                         break;
 132                 case I2S_SP_INSTANCE:
 133                 default:
 134                         val = ACP_SRAM_SP_CP_PTE_OFFSET;
 135                 }
 136         }
 137         /* Group Enable */
 138         rv_writel(ACP_SRAM_PTE_OFFSET | BIT(31), rtd->acp3x_base +
 139                   mmACPAXI2AXI_ATU_BASE_ADDR_GRP_1);
 140         rv_writel(PAGE_SIZE_4K_ENABLE, rtd->acp3x_base +
 141                   mmACPAXI2AXI_ATU_PAGE_SIZE_GRP_1);
 142
 143         for (page_idx = 0; page_idx < rtd->num_pages; page_idx++) {
 144                 /* Load the low address of page int ACP SRAM through SRBM */
 145                 low = lower_32_bits(addr);
 146                 high = upper_32_bits(addr);
 147
 148                 rv_writel(low, rtd->acp3x_base + mmACP_SCRATCH_REG_0 + val);
 149                 high |= BIT(31);
 150                 rv_writel(high, rtd->acp3x_base + mmACP_SCRATCH_REG_0 + val
 151                                 + 4);
 152                 /* Move to next physically contiguos page */
 153                 val += 8;
 154                 addr += PAGE_SIZE;
 155         }
 156
 157         if (direction == SNDRV_PCM_STREAM_PLAYBACK) {
 158                 switch (rtd->i2s_instance) {
 159                 case I2S_BT_INSTANCE:
 160                         reg_ringbuf_size = mmACP_BT_TX_RINGBUFSIZE;
 161                         reg_dma_size = mmACP_BT_TX_DMA_SIZE;
 162                         acp_fifo_addr = ACP_SRAM_PTE_OFFSET +
 163                                                 BT_PB_FIFO_ADDR_OFFSET;
 164                         reg_fifo_addr = mmACP_BT_TX_FIFOADDR;
 165                         reg_fifo_size = mmACP_BT_TX_FIFOSIZE;
 166                         rv_writel(I2S_BT_TX_MEM_WINDOW_START,
 167                                 rtd->acp3x_base + mmACP_BT_TX_RINGBUFADDR);
 168                         break;
 169
 170                 case I2S_SP_INSTANCE:
 171                 default:
 172                         reg_ringbuf_size = mmACP_I2S_TX_RINGBUFSIZE;
 173                         reg_dma_size = mmACP_I2S_TX_DMA_SIZE;
 174                         acp_fifo_addr = ACP_SRAM_PTE_OFFSET +
 175                                                 SP_PB_FIFO_ADDR_OFFSET;
 176                         reg_fifo_addr = mmACP_I2S_TX_FIFOADDR;
 177                         reg_fifo_size = mmACP_I2S_TX_FIFOSIZE;
 178                         rv_writel(I2S_SP_TX_MEM_WINDOW_START,
 179                                 rtd->acp3x_base + mmACP_I2S_TX_RINGBUFADDR);
 180                 }
 181         } else {
 182                 switch (rtd->i2s_instance) {
 183                 case I2S_BT_INSTANCE:
 184                         reg_ringbuf_size = mmACP_BT_RX_RINGBUFSIZE;
 185                         reg_dma_size = mmACP_BT_RX_DMA_SIZE;
 186                         acp_fifo_addr = ACP_SRAM_PTE_OFFSET +
 187                                                 BT_CAPT_FIFO_ADDR_OFFSET;
 188                         reg_fifo_addr = mmACP_BT_RX_FIFOADDR;
 189                         reg_fifo_size = mmACP_BT_RX_FIFOSIZE;
 190                         rv_writel(I2S_BT_RX_MEM_WINDOW_START,
 191                                 rtd->acp3x_base + mmACP_BT_RX_RINGBUFADDR);
 192                         break;
 193
 194                 case I2S_SP_INSTANCE:
 195                 default:
 196                         reg_ringbuf_size = mmACP_I2S_RX_RINGBUFSIZE;
 197                         reg_dma_size = mmACP_I2S_RX_DMA_SIZE;
 198                         acp_fifo_addr = ACP_SRAM_PTE_OFFSET +
 199                                                 SP_CAPT_FIFO_ADDR_OFFSET;
 200                         reg_fifo_addr = mmACP_I2S_RX_FIFOADDR;
 201                         reg_fifo_size = mmACP_I2S_RX_FIFOSIZE;
 202                         rv_writel(I2S_SP_RX_MEM_WINDOW_START,
 203                                 rtd->acp3x_base + mmACP_I2S_RX_RINGBUFADDR);
 204                 }
 205         }
 206         rv_writel(MAX_BUFFER, rtd->acp3x_base + reg_ringbuf_size);
 207         rv_writel(DMA_SIZE, rtd->acp3x_base + reg_dma_size);
 208         rv_writel(acp_fifo_addr, rtd->acp3x_base + reg_fifo_addr);
 209         rv_writel(FIFO_SIZE, rtd->acp3x_base + reg_fifo_size);
 210         rv_writel(BIT(I2S_RX_THRESHOLD) | BIT(BT_RX_THRESHOLD)
 211                 | BIT(I2S_TX_THRESHOLD) | BIT(BT_TX_THRESHOLD),
 212                 rtd->acp3x_base + mmACP_EXTERNAL_INTR_CNTL);
 213 }
 214
 215 static int acp3x_dma_open(struct snd_soc_component *component,
 216                           struct snd_pcm_substream *substream)
 217 {
 218         struct snd_pcm_runtime *runtime;
 219         struct snd_soc_pcm_runtime *prtd;
 220         struct i2s_dev_data *adata;
 221         struct i2s_stream_instance *i2s_data;
 222         int ret;
 223
 224         runtime = substream->runtime;
 225         prtd = substream->private_data;
 226         component = snd_soc_rtdcom_lookup(prtd, DRV_NAME);
 227         adata = dev_get_drvdata(component->dev);
 228         i2s_data = kzalloc(sizeof(*i2s_data), GFP_KERNEL);
 229         if (!i2s_data)
 230                 return -EINVAL;
 231
 232         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 233                 runtime->hw = acp3x_pcm_hardware_playback;
 234         else
 235                 runtime->hw = acp3x_pcm_hardware_capture;
 236
 237         ret = snd_pcm_hw_constraint_integer(runtime,
 238                                             SNDRV_PCM_HW_PARAM_PERIODS);
 239         if (ret < 0) {
 240                 dev_err(component->dev, "set integer constraint failed\n");
 241                 kfree(i2s_data);
 242                 return ret;
 243         }
 244
 245         if (!adata->play_stream && !adata->capture_stream &&
 246                 adata->i2ssp_play_stream && !adata->i2ssp_capture_stream)
 247                 rv_writel(1, adata->acp3x_base + mmACP_EXTERNAL_INTR_ENB);
 248
 249         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 250                 adata->play_stream = substream;
 251                 adata->i2ssp_play_stream = substream;
 252         } else {
 253                 adata->capture_stream = substream;
 254                 adata->i2ssp_capture_stream = substream;
 255         }
 256
 257         i2s_data->acp3x_base = adata->acp3x_base;
 258         runtime->private_data = i2s_data;
 259         return ret;
 260 }
 261
 262
 263 static int acp3x_dma_hw_params(struct snd_soc_component *component,
 264                                struct snd_pcm_substream *substream,
 265                                struct snd_pcm_hw_params *params)
 266 {
 267         struct i2s_stream_instance *rtd;
 268         struct snd_soc_pcm_runtime *prtd;
 269         struct snd_soc_card *card;
 270         struct acp3x_platform_info *pinfo;
 271         u64 size;
 272
 273         prtd = substream->private_data;
 274         card = prtd->card;
 275         pinfo = snd_soc_card_get_drvdata(card);
 276         rtd = substream->runtime->private_data;
 277         if (!rtd)
 278                 return -EINVAL;
 279
 280         if (pinfo)
 281                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 282                         rtd->i2s_instance = pinfo->play_i2s_instance;
 283                 else
 284                         rtd->i2s_instance = pinfo->cap_i2s_instance;
 285         else
 286                 pr_err("pinfo failed\n");
 287
 288         size = params_buffer_bytes(params);
 289         rtd->dma_addr = substream->dma_buffer.addr;
 290         rtd->num_pages = (PAGE_ALIGN(size) >> PAGE_SHIFT);
 291         config_acp3x_dma(rtd, substream->stream);
 292         return 0;
 293 }
 294
 295 static snd_pcm_uframes_t acp3x_dma_pointer(struct snd_soc_component *component,
 296                                            struct snd_pcm_substream *substream)
 297 {
 298         struct snd_soc_pcm_runtime *prtd;
 299         struct snd_soc_card *card;
 300         struct acp3x_platform_info *pinfo;
 301         struct i2s_stream_instance *rtd;
 302         u32 pos;
 303         u32 buffersize;
 304         u64 bytescount;
 305
 306         prtd = substream->private_data;
 307         card = prtd->card;
 308         rtd = substream->runtime->private_data;
 309         pinfo = snd_soc_card_get_drvdata(card);
 310         if (pinfo) {
 311                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 312                         rtd->i2s_instance = pinfo->play_i2s_instance;
 313                 else
 314                         rtd->i2s_instance = pinfo->cap_i2s_instance;
 315         }
 316
 317         buffersize = frames_to_bytes(substream->runtime,
 318                                      substream->runtime->buffer_size);
 319         bytescount = acp_get_byte_count(rtd, substream->stream);
 320         if (bytescount > rtd->bytescount)
 321                 bytescount -= rtd->bytescount;
 322         pos = do_div(bytescount, buffersize);
 323         return bytes_to_frames(substream->runtime, pos);
 324 }
 325
 326 static int acp3x_dma_new(struct snd_soc_component *component,
 327                          struct snd_soc_pcm_runtime *rtd)
 328 {
 329         struct device *parent = component->dev->parent;
 330         snd_pcm_set_managed_buffer_all(rtd->pcm, SNDRV_DMA_TYPE_DEV,
 331                                        parent, MIN_BUFFER, MAX_BUFFER);
 332         return 0;
 333 }
 334
 335 static int acp3x_dma_mmap(struct snd_soc_component *component,
 336                           struct snd_pcm_substream *substream,
 337                           struct vm_area_struct *vma)
 338 {
 339         return snd_pcm_lib_default_mmap(substream, vma);
 340 }
 341
 342 static int acp3x_dma_close(struct snd_soc_component *component,
 343                            struct snd_pcm_substream *substream)
 344 {
 345         struct snd_soc_pcm_runtime *prtd;
 346         struct i2s_dev_data *adata;
 347
 348         prtd = substream->private_data;
 349         component = snd_soc_rtdcom_lookup(prtd, DRV_NAME);
 350         adata = dev_get_drvdata(component->dev);
 351
 352         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 353                 adata->play_stream = NULL;
 354                 adata->i2ssp_play_stream = NULL;
 355         } else {
 356                 adata->capture_stream = NULL;
 357                 adata->i2ssp_capture_stream = NULL;
 358         }
 359
 360         /* Disable ACP irq, when the current stream is being closed and
 361          * another stream is also not active.
 362          */
 363         if (!adata->play_stream && !adata->capture_stream &&
 364                 !adata->i2ssp_play_stream && !adata->i2ssp_capture_stream)
 365                 rv_writel(0, adata->acp3x_base + mmACP_EXTERNAL_INTR_ENB);
 366         return 0;
 367 }
 368
 369 static const struct snd_soc_component_driver acp3x_i2s_component = {
 370         .name           = DRV_NAME,
 371         .open           = acp3x_dma_open,
 372         .close          = acp3x_dma_close,
 373         .hw_params      = acp3x_dma_hw_params,
 374         .pointer        = acp3x_dma_pointer,
 375         .mmap           = acp3x_dma_mmap,
 376         .pcm_construct  = acp3x_dma_new,
 377 };
 378
 379 static int acp3x_audio_probe(struct platform_device *pdev)
 380 {
 381         struct resource *res;
 382         struct i2s_dev_data *adata;
 383         unsigned int irqflags;
 384         int status;
 385
 386         if (!pdev->dev.platform_data) {
 387                 dev_err(&pdev->dev, "platform_data not retrieved\n");
 388                 return -ENODEV;
 389         }
 390         irqflags = *((unsigned int *)(pdev->dev.platform_data));
 391
 392         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 393         if (!res) {
 394                 dev_err(&pdev->dev, "IORESOURCE_MEM FAILED\n");
 395                 return -ENODEV;
 396         }
 397
 398         adata = devm_kzalloc(&pdev->dev, sizeof(*adata), GFP_KERNEL);
 399         if (!adata)
 400                 return -ENOMEM;
 401
 402         adata->acp3x_base = devm_ioremap(&pdev->dev, res->start,
 403                                          resource_size(res));
 404         if (!adata->acp3x_base)
 405                 return -ENOMEM;
 406
 407         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 408         if (!res) {
 409                 dev_err(&pdev->dev, "IORESOURCE_IRQ FAILED\n");
 410                 return -ENODEV;
 411         }
 412
 413         adata->i2s_irq = res->start;
 414
 415         dev_set_drvdata(&pdev->dev, adata);
 416         status = devm_snd_soc_register_component(&pdev->dev,
 417                                                  &acp3x_i2s_component,
 418                                                  NULL, 0);
 419         if (status) {
 420                 dev_err(&pdev->dev, "Fail to register acp i2s component\n");
 421                 return -ENODEV;
 422         }
 423         status = devm_request_irq(&pdev->dev, adata->i2s_irq, i2s_irq_handler,
 424                                   irqflags, "ACP3x_I2S_IRQ", adata);
 425         if (status) {
 426                 dev_err(&pdev->dev, "ACP3x I2S IRQ request failed\n");
 427                 return -ENODEV;
 428         }
 429
 430         pm_runtime_set_autosuspend_delay(&pdev->dev, 2000);
 431         pm_runtime_use_autosuspend(&pdev->dev);
 432         pm_runtime_enable(&pdev->dev);
 433         pm_runtime_allow(&pdev->dev);
 434         return 0;
 435 }
 436
 437 static int acp3x_audio_remove(struct platform_device *pdev)
 438 {
 439         pm_runtime_disable(&pdev->dev);
 440         return 0;
 441 }
 442
 443 static int acp3x_resume(struct device *dev)
 444 {
 445         struct i2s_dev_data *adata;
 446         u32 val, reg_val, frmt_val;
 447
 448         reg_val = 0;
 449         frmt_val = 0;
 450         adata = dev_get_drvdata(dev);
 451
 452         if (adata->play_stream && adata->play_stream->runtime) {
 453                 struct i2s_stream_instance *rtd =
 454                         adata->play_stream->runtime->private_data;
 455                 config_acp3x_dma(rtd, SNDRV_PCM_STREAM_PLAYBACK);
 456                 switch (rtd->i2s_instance) {
 457                 case I2S_BT_INSTANCE:
 458                         reg_val = mmACP_BTTDM_ITER;
 459                         frmt_val = mmACP_BTTDM_TXFRMT;
 460                         break;
 461                 case I2S_SP_INSTANCE:
 462                 default:
 463                         reg_val = mmACP_I2STDM_ITER;
 464                         frmt_val = mmACP_I2STDM_TXFRMT;
 465                 }
 466         rv_writel((rtd->xfer_resolution  << 3), rtd->acp3x_base + reg_val);
 467         }
 468         if (adata->capture_stream && adata->capture_stream->runtime) {
 469                 struct i2s_stream_instance *rtd =
 470                         adata->capture_stream->runtime->private_data;
 471                 config_acp3x_dma(rtd, SNDRV_PCM_STREAM_CAPTURE);
 472                 switch (rtd->i2s_instance) {
 473                 case I2S_BT_INSTANCE:
 474                         reg_val = mmACP_BTTDM_IRER;
 475                         frmt_val = mmACP_BTTDM_RXFRMT;
 476                         break;
 477                 case I2S_SP_INSTANCE:
 478                 default:
 479                         reg_val = mmACP_I2STDM_IRER;
 480                         frmt_val = mmACP_I2STDM_RXFRMT;
 481                 }
 482         rv_writel((rtd->xfer_resolution  << 3), rtd->acp3x_base + reg_val);
 483         }
 484         if (adata->tdm_mode == TDM_ENABLE) {
 485                 rv_writel(adata->tdm_fmt, adata->acp3x_base + frmt_val);
 486                 val = rv_readl(adata->acp3x_base + reg_val);
 487                 rv_writel(val | 0x2, adata->acp3x_base + reg_val);
 488         }
 489         rv_writel(1, adata->acp3x_base + mmACP_EXTERNAL_INTR_ENB);
 490         return 0;
 491 }
 492
 493
 494 static int acp3x_pcm_runtime_suspend(struct device *dev)
 495 {
 496         struct i2s_dev_data *adata;
 497
 498         adata = dev_get_drvdata(dev);
 499
 500         rv_writel(0, adata->acp3x_base + mmACP_EXTERNAL_INTR_ENB);
 501
 502         return 0;
 503 }
 504
 505 static int acp3x_pcm_runtime_resume(struct device *dev)
 506 {
 507         struct i2s_dev_data *adata;
 508
 509         adata = dev_get_drvdata(dev);
 510
 511         rv_writel(1, adata->acp3x_base + mmACP_EXTERNAL_INTR_ENB);
 512         return 0;
 513 }
 514
 515 static const struct dev_pm_ops acp3x_pm_ops = {
 516         .runtime_suspend = acp3x_pcm_runtime_suspend,
 517         .runtime_resume = acp3x_pcm_runtime_resume,
 518         .resume = acp3x_resume,
 519 };
 520
 521 static struct platform_driver acp3x_dma_driver = {
 522         .probe = acp3x_audio_probe,
 523         .remove = acp3x_audio_remove,
 524         .driver = {
 525                 .name = "acp3x_rv_i2s_dma",
 526                 .pm = &acp3x_pm_ops,
 527         },
 528 };
 529
 530 module_platform_driver(acp3x_dma_driver);
 531
 532 MODULE_AUTHOR("Vishnuvardhanrao.Ravulapati@amd.com");
 533 MODULE_AUTHOR("Maruthi.Bayyavarapu@amd.com");
 534 MODULE_AUTHOR("Vijendar.Mukunda@amd.com");
 535 MODULE_DESCRIPTION("AMD ACP 3.x PCM Driver");
 536 MODULE_LICENSE("GPL v2");
 537 MODULE_ALIAS("platform:" DRV_NAME);