sound/soc/amd/vangogh/acp5x-pcm-dma.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 //
   3 // AMD ALSA SoC PCM Driver
   4 //
   5 // Copyright (C) 2021 Advanced Micro Devices, Inc. All rights reserved.
   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.h>
  13 #include <sound/pcm_params.h>
  14 #include <sound/soc.h>
  15 #include <sound/soc-dai.h>
  16
  17 #include "acp5x.h"
  18
  19 #define DRV_NAME "acp5x_i2s_dma"
  20
  21 static const struct snd_pcm_hardware acp5x_pcm_hardware_playback = {
  22         .info = SNDRV_PCM_INFO_INTERLEAVED |
  23                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
  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_S32_LE,
  28         .channels_min = 2,
  29         .channels_max = 2,
  30         .rates = SNDRV_PCM_RATE_8000_96000,
  31         .rate_min = 8000,
  32         .rate_max = 96000,
  33         .buffer_bytes_max = PLAYBACK_MAX_NUM_PERIODS * PLAYBACK_MAX_PERIOD_SIZE,
  34         .period_bytes_min = PLAYBACK_MIN_PERIOD_SIZE,
  35         .period_bytes_max = PLAYBACK_MAX_PERIOD_SIZE,
  36         .periods_min = PLAYBACK_MIN_NUM_PERIODS,
  37         .periods_max = PLAYBACK_MAX_NUM_PERIODS,
  38 };
  39
  40 static const struct snd_pcm_hardware acp5x_pcm_hardware_capture = {
  41         .info = SNDRV_PCM_INFO_INTERLEAVED |
  42                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
  43                 SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
  44                 SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME,
  45         .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S8 |
  46                    SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S32_LE,
  47         .channels_min = 2,
  48         .channels_max = 2,
  49         .rates = SNDRV_PCM_RATE_8000_96000,
  50         .rate_min = 8000,
  51         .rate_max = 96000,
  52         .buffer_bytes_max = CAPTURE_MAX_NUM_PERIODS * CAPTURE_MAX_PERIOD_SIZE,
  53         .period_bytes_min = CAPTURE_MIN_PERIOD_SIZE,
  54         .period_bytes_max = CAPTURE_MAX_PERIOD_SIZE,
  55         .periods_min = CAPTURE_MIN_NUM_PERIODS,
  56         .periods_max = CAPTURE_MAX_NUM_PERIODS,
  57 };
  58
  59 static irqreturn_t i2s_irq_handler(int irq, void *dev_id)
  60 {
  61         struct i2s_dev_data *vg_i2s_data;
  62         u16 irq_flag;
  63         u32 val;
  64
  65         vg_i2s_data = dev_id;
  66         if (!vg_i2s_data)
  67                 return IRQ_NONE;
  68
  69         irq_flag = 0;
  70         val = acp_readl(vg_i2s_data->acp5x_base + ACP_EXTERNAL_INTR_STAT);
  71         if ((val & BIT(HS_TX_THRESHOLD)) && vg_i2s_data->play_stream) {
  72                 acp_writel(BIT(HS_TX_THRESHOLD), vg_i2s_data->acp5x_base +
  73                            ACP_EXTERNAL_INTR_STAT);
  74                 snd_pcm_period_elapsed(vg_i2s_data->play_stream);
  75                 irq_flag = 1;
  76         }
  77         if ((val & BIT(I2S_TX_THRESHOLD)) && vg_i2s_data->i2ssp_play_stream) {
  78                 acp_writel(BIT(I2S_TX_THRESHOLD),
  79                            vg_i2s_data->acp5x_base + ACP_EXTERNAL_INTR_STAT);
  80                 snd_pcm_period_elapsed(vg_i2s_data->i2ssp_play_stream);
  81                 irq_flag = 1;
  82         }
  83
  84         if ((val & BIT(HS_RX_THRESHOLD)) && vg_i2s_data->capture_stream) {
  85                 acp_writel(BIT(HS_RX_THRESHOLD), vg_i2s_data->acp5x_base +
  86                            ACP_EXTERNAL_INTR_STAT);
  87                 snd_pcm_period_elapsed(vg_i2s_data->capture_stream);
  88                 irq_flag = 1;
  89         }
  90         if ((val & BIT(I2S_RX_THRESHOLD)) && vg_i2s_data->i2ssp_capture_stream) {
  91                 acp_writel(BIT(I2S_RX_THRESHOLD),
  92                            vg_i2s_data->acp5x_base + ACP_EXTERNAL_INTR_STAT);
  93                 snd_pcm_period_elapsed(vg_i2s_data->i2ssp_capture_stream);
  94                 irq_flag = 1;
  95         }
  96
  97         if (irq_flag)
  98                 return IRQ_HANDLED;
  99         else
 100                 return IRQ_NONE;
 101 }
 102
 103 static void config_acp5x_dma(struct i2s_stream_instance *rtd, int direction)
 104 {
 105         u16 page_idx;
 106         u32 low, high, val, acp_fifo_addr, reg_fifo_addr;
 107         u32 reg_dma_size, reg_fifo_size;
 108         dma_addr_t addr;
 109
 110         addr = rtd->dma_addr;
 111         if (direction == SNDRV_PCM_STREAM_PLAYBACK) {
 112                 switch (rtd->i2s_instance) {
 113                 case I2S_HS_INSTANCE:
 114                         val = ACP_SRAM_HS_PB_PTE_OFFSET;
 115                         break;
 116                 case I2S_SP_INSTANCE:
 117                 default:
 118                         val = ACP_SRAM_SP_PB_PTE_OFFSET;
 119                 }
 120         } else {
 121                 switch (rtd->i2s_instance) {
 122                 case I2S_HS_INSTANCE:
 123                         val = ACP_SRAM_HS_CP_PTE_OFFSET;
 124                         break;
 125                 case I2S_SP_INSTANCE:
 126                 default:
 127                         val = ACP_SRAM_SP_CP_PTE_OFFSET;
 128                 }
 129         }
 130         /* Group Enable */
 131         acp_writel(ACP_SRAM_PTE_OFFSET | BIT(31), rtd->acp5x_base +
 132                    ACPAXI2AXI_ATU_BASE_ADDR_GRP_1);
 133         acp_writel(PAGE_SIZE_4K_ENABLE, rtd->acp5x_base +
 134                    ACPAXI2AXI_ATU_PAGE_SIZE_GRP_1);
 135
 136         for (page_idx = 0; page_idx < rtd->num_pages; page_idx++) {
 137                 /* Load the low address of page int ACP SRAM through SRBM */
 138                 low = lower_32_bits(addr);
 139                 high = upper_32_bits(addr);
 140
 141                 acp_writel(low, rtd->acp5x_base + ACP_SCRATCH_REG_0 + val);
 142                 high |= BIT(31);
 143                 acp_writel(high, rtd->acp5x_base + ACP_SCRATCH_REG_0 + val + 4);
 144                 /* Move to next physically contiguous page */
 145                 val += 8;
 146                 addr += PAGE_SIZE;
 147         }
 148
 149         if (direction == SNDRV_PCM_STREAM_PLAYBACK) {
 150                 switch (rtd->i2s_instance) {
 151                 case I2S_HS_INSTANCE:
 152                         reg_dma_size = ACP_HS_TX_DMA_SIZE;
 153                         acp_fifo_addr = ACP_SRAM_PTE_OFFSET +
 154                                         HS_PB_FIFO_ADDR_OFFSET;
 155                         reg_fifo_addr = ACP_HS_TX_FIFOADDR;
 156                         reg_fifo_size = ACP_HS_TX_FIFOSIZE;
 157                         acp_writel(I2S_HS_TX_MEM_WINDOW_START,
 158                                    rtd->acp5x_base + ACP_HS_TX_RINGBUFADDR);
 159                         break;
 160
 161                 case I2S_SP_INSTANCE:
 162                 default:
 163                         reg_dma_size = ACP_I2S_TX_DMA_SIZE;
 164                         acp_fifo_addr = ACP_SRAM_PTE_OFFSET +
 165                                         SP_PB_FIFO_ADDR_OFFSET;
 166                         reg_fifo_addr = ACP_I2S_TX_FIFOADDR;
 167                         reg_fifo_size = ACP_I2S_TX_FIFOSIZE;
 168                         acp_writel(I2S_SP_TX_MEM_WINDOW_START,
 169                                    rtd->acp5x_base + ACP_I2S_TX_RINGBUFADDR);
 170                 }
 171         } else {
 172                 switch (rtd->i2s_instance) {
 173                 case I2S_HS_INSTANCE:
 174                         reg_dma_size = ACP_HS_RX_DMA_SIZE;
 175                         acp_fifo_addr = ACP_SRAM_PTE_OFFSET +
 176                                         HS_CAPT_FIFO_ADDR_OFFSET;
 177                         reg_fifo_addr = ACP_HS_RX_FIFOADDR;
 178                         reg_fifo_size = ACP_HS_RX_FIFOSIZE;
 179                         acp_writel(I2S_HS_RX_MEM_WINDOW_START,
 180                                    rtd->acp5x_base + ACP_HS_RX_RINGBUFADDR);
 181                         break;
 182
 183                 case I2S_SP_INSTANCE:
 184                 default:
 185                         reg_dma_size = ACP_I2S_RX_DMA_SIZE;
 186                         acp_fifo_addr = ACP_SRAM_PTE_OFFSET +
 187                                         SP_CAPT_FIFO_ADDR_OFFSET;
 188                         reg_fifo_addr = ACP_I2S_RX_FIFOADDR;
 189                         reg_fifo_size = ACP_I2S_RX_FIFOSIZE;
 190                         acp_writel(I2S_SP_RX_MEM_WINDOW_START,
 191                                    rtd->acp5x_base + ACP_I2S_RX_RINGBUFADDR);
 192                 }
 193         }
 194         acp_writel(DMA_SIZE, rtd->acp5x_base + reg_dma_size);
 195         acp_writel(acp_fifo_addr, rtd->acp5x_base + reg_fifo_addr);
 196         acp_writel(FIFO_SIZE, rtd->acp5x_base + reg_fifo_size);
 197         acp_writel(BIT(I2S_RX_THRESHOLD) | BIT(HS_RX_THRESHOLD)
 198                    | BIT(I2S_TX_THRESHOLD) | BIT(HS_TX_THRESHOLD),
 199                    rtd->acp5x_base + ACP_EXTERNAL_INTR_CNTL);
 200 }
 201
 202 static int acp5x_dma_open(struct snd_soc_component *component,
 203                           struct snd_pcm_substream *substream)
 204 {
 205         struct snd_pcm_runtime *runtime;
 206         struct snd_soc_pcm_runtime *prtd;
 207         struct i2s_dev_data *adata;
 208         struct i2s_stream_instance *i2s_data;
 209         int ret;
 210
 211         runtime = substream->runtime;
 212         prtd = asoc_substream_to_rtd(substream);
 213         component = snd_soc_rtdcom_lookup(prtd, DRV_NAME);
 214         adata = dev_get_drvdata(component->dev);
 215
 216         i2s_data = kzalloc(sizeof(*i2s_data), GFP_KERNEL);
 217         if (!i2s_data)
 218                 return -ENOMEM;
 219
 220         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 221                 runtime->hw = acp5x_pcm_hardware_playback;
 222         else
 223                 runtime->hw = acp5x_pcm_hardware_capture;
 224
 225         ret = snd_pcm_hw_constraint_integer(runtime,
 226                                             SNDRV_PCM_HW_PARAM_PERIODS);
 227         if (ret < 0) {
 228                 dev_err(component->dev, "set integer constraint failed\n");
 229                 kfree(i2s_data);
 230                 return ret;
 231         }
 232         i2s_data->acp5x_base = adata->acp5x_base;
 233         runtime->private_data = i2s_data;
 234         return ret;
 235 }
 236
 237 static int acp5x_dma_hw_params(struct snd_soc_component *component,
 238                                struct snd_pcm_substream *substream,
 239                                struct snd_pcm_hw_params *params)
 240 {
 241         struct i2s_stream_instance *rtd;
 242         struct snd_soc_pcm_runtime *prtd;
 243         struct snd_soc_card *card;
 244         struct acp5x_platform_info *pinfo;
 245         struct i2s_dev_data *adata;
 246         u64 size;
 247
 248         prtd = asoc_substream_to_rtd(substream);
 249         card = prtd->card;
 250         pinfo = snd_soc_card_get_drvdata(card);
 251         adata = dev_get_drvdata(component->dev);
 252         rtd = substream->runtime->private_data;
 253
 254         if (!rtd)
 255                 return -EINVAL;
 256
 257         if (pinfo) {
 258                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 259                         rtd->i2s_instance = pinfo->play_i2s_instance;
 260                         switch (rtd->i2s_instance) {
 261                         case I2S_HS_INSTANCE:
 262                                 adata->play_stream = substream;
 263                                 break;
 264                         case I2S_SP_INSTANCE:
 265                         default:
 266                                 adata->i2ssp_play_stream = substream;
 267                         }
 268                 } else {
 269                         rtd->i2s_instance = pinfo->cap_i2s_instance;
 270                         switch (rtd->i2s_instance) {
 271                         case I2S_HS_INSTANCE:
 272                                 adata->capture_stream = substream;
 273                                 break;
 274                         case I2S_SP_INSTANCE:
 275                         default:
 276                                 adata->i2ssp_capture_stream = substream;
 277                         }
 278                 }
 279         } else {
 280                 dev_err(component->dev, "pinfo failed\n");
 281                 return -EINVAL;
 282         }
 283         size = params_buffer_bytes(params);
 284         rtd->dma_addr = substream->runtime->dma_addr;
 285         rtd->num_pages = (PAGE_ALIGN(size) >> PAGE_SHIFT);
 286         config_acp5x_dma(rtd, substream->stream);
 287         return 0;
 288 }
 289
 290 static snd_pcm_uframes_t acp5x_dma_pointer(struct snd_soc_component *component,
 291                                            struct snd_pcm_substream *substream)
 292 {
 293         struct i2s_stream_instance *rtd;
 294         u32 pos;
 295         u32 buffersize;
 296         u64 bytescount;
 297
 298         rtd = substream->runtime->private_data;
 299         buffersize = frames_to_bytes(substream->runtime,
 300                                      substream->runtime->buffer_size);
 301         bytescount = acp_get_byte_count(rtd, substream->stream);
 302         if (bytescount > rtd->bytescount)
 303                 bytescount -= rtd->bytescount;
 304         pos = do_div(bytescount, buffersize);
 305         return bytes_to_frames(substream->runtime, pos);
 306 }
 307
 308 static int acp5x_dma_new(struct snd_soc_component *component,
 309                          struct snd_soc_pcm_runtime *rtd)
 310 {
 311         struct device *parent = component->dev->parent;
 312
 313         snd_pcm_set_managed_buffer_all(rtd->pcm, SNDRV_DMA_TYPE_DEV,
 314                                        parent, MIN_BUFFER, MAX_BUFFER);
 315         return 0;
 316 }
 317
 318 static int acp5x_dma_close(struct snd_soc_component *component,
 319                            struct snd_pcm_substream *substream)
 320 {
 321         struct snd_soc_pcm_runtime *prtd;
 322         struct i2s_dev_data *adata;
 323         struct i2s_stream_instance *ins;
 324
 325         prtd = asoc_substream_to_rtd(substream);
 326         component = snd_soc_rtdcom_lookup(prtd, DRV_NAME);
 327         adata = dev_get_drvdata(component->dev);
 328         ins = substream->runtime->private_data;
 329         if (!ins)
 330                 return -EINVAL;
 331         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 332                 switch (ins->i2s_instance) {
 333                 case I2S_HS_INSTANCE:
 334                         adata->play_stream = NULL;
 335                         break;
 336                 case I2S_SP_INSTANCE:
 337                 default:
 338                         adata->i2ssp_play_stream = NULL;
 339                 }
 340         } else {
 341                 switch (ins->i2s_instance) {
 342                 case I2S_HS_INSTANCE:
 343                         adata->capture_stream = NULL;
 344                         break;
 345                 case I2S_SP_INSTANCE:
 346                 default:
 347                         adata->i2ssp_capture_stream = NULL;
 348                 }
 349         }
 350         kfree(ins);
 351         return 0;
 352 }
 353
 354 static const struct snd_soc_component_driver acp5x_i2s_component = {
 355         .name           = DRV_NAME,
 356         .open           = acp5x_dma_open,
 357         .close          = acp5x_dma_close,
 358         .hw_params      = acp5x_dma_hw_params,
 359         .pointer        = acp5x_dma_pointer,
 360         .pcm_construct  = acp5x_dma_new,
 361 };
 362
 363 static int acp5x_audio_probe(struct platform_device *pdev)
 364 {
 365         struct resource *res;
 366         struct i2s_dev_data *adata;
 367         unsigned int irqflags;
 368         int status;
 369
 370         if (!pdev->dev.platform_data) {
 371                 dev_err(&pdev->dev, "platform_data not retrieved\n");
 372                 return -ENODEV;
 373         }
 374         irqflags = *((unsigned int *)(pdev->dev.platform_data));
 375
 376         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 377         if (!res) {
 378                 dev_err(&pdev->dev, "IORESOURCE_MEM FAILED\n");
 379                 return -ENODEV;
 380         }
 381
 382         adata = devm_kzalloc(&pdev->dev, sizeof(*adata), GFP_KERNEL);
 383         if (!adata)
 384                 return -ENOMEM;
 385
 386         adata->acp5x_base = devm_ioremap(&pdev->dev, res->start,
 387                                          resource_size(res));
 388         if (!adata->acp5x_base)
 389                 return -ENOMEM;
 390
 391         status = platform_get_irq(pdev, 0);
 392         if (status < 0)
 393                 return status;
 394         adata->i2s_irq = status;
 395
 396         dev_set_drvdata(&pdev->dev, adata);
 397         status = devm_snd_soc_register_component(&pdev->dev,
 398                                                  &acp5x_i2s_component,
 399                                                  NULL, 0);
 400         if (status) {
 401                 dev_err(&pdev->dev, "Fail to register acp i2s component\n");
 402                 return status;
 403         }
 404         status = devm_request_irq(&pdev->dev, adata->i2s_irq, i2s_irq_handler,
 405                                   irqflags, "ACP5x_I2S_IRQ", adata);
 406         if (status) {
 407                 dev_err(&pdev->dev, "ACP5x I2S IRQ request failed\n");
 408                 return status;
 409         }
 410         pm_runtime_set_autosuspend_delay(&pdev->dev, 2000);
 411         pm_runtime_use_autosuspend(&pdev->dev);
 412         pm_runtime_enable(&pdev->dev);
 413         pm_runtime_allow(&pdev->dev);
 414
 415         return 0;
 416 }
 417
 418 static int acp5x_audio_remove(struct platform_device *pdev)
 419 {
 420         pm_runtime_disable(&pdev->dev);
 421         return 0;
 422 }
 423
 424 static int __maybe_unused acp5x_pcm_resume(struct device *dev)
 425 {
 426         struct i2s_dev_data *adata;
 427         struct i2s_stream_instance *rtd;
 428         u32 val;
 429
 430         adata = dev_get_drvdata(dev);
 431
 432         if (adata->play_stream && adata->play_stream->runtime) {
 433                 rtd = adata->play_stream->runtime->private_data;
 434                 config_acp5x_dma(rtd, SNDRV_PCM_STREAM_PLAYBACK);
 435                 acp_writel((rtd->xfer_resolution  << 3), rtd->acp5x_base + ACP_HSTDM_ITER);
 436                 if (adata->tdm_mode == TDM_ENABLE) {
 437                         acp_writel(adata->tdm_fmt, adata->acp5x_base + ACP_HSTDM_TXFRMT);
 438                         val = acp_readl(adata->acp5x_base + ACP_HSTDM_ITER);
 439                         acp_writel(val | 0x2, adata->acp5x_base + ACP_HSTDM_ITER);
 440                 }
 441         }
 442         if (adata->i2ssp_play_stream && adata->i2ssp_play_stream->runtime) {
 443                 rtd = adata->i2ssp_play_stream->runtime->private_data;
 444                 config_acp5x_dma(rtd, SNDRV_PCM_STREAM_PLAYBACK);
 445                 acp_writel((rtd->xfer_resolution  << 3), rtd->acp5x_base + ACP_I2STDM_ITER);
 446                 if (adata->tdm_mode == TDM_ENABLE) {
 447                         acp_writel(adata->tdm_fmt, adata->acp5x_base + ACP_I2STDM_TXFRMT);
 448                         val = acp_readl(adata->acp5x_base + ACP_I2STDM_ITER);
 449                         acp_writel(val | 0x2, adata->acp5x_base + ACP_I2STDM_ITER);
 450                 }
 451         }
 452
 453         if (adata->capture_stream && adata->capture_stream->runtime) {
 454                 rtd = adata->capture_stream->runtime->private_data;
 455                 config_acp5x_dma(rtd, SNDRV_PCM_STREAM_CAPTURE);
 456                 acp_writel((rtd->xfer_resolution  << 3), rtd->acp5x_base + ACP_HSTDM_IRER);
 457                 if (adata->tdm_mode == TDM_ENABLE) {
 458                         acp_writel(adata->tdm_fmt, adata->acp5x_base + ACP_HSTDM_RXFRMT);
 459                         val = acp_readl(adata->acp5x_base + ACP_HSTDM_IRER);
 460                         acp_writel(val | 0x2, adata->acp5x_base + ACP_HSTDM_IRER);
 461                 }
 462         }
 463         if (adata->i2ssp_capture_stream && adata->i2ssp_capture_stream->runtime) {
 464                 rtd = adata->i2ssp_capture_stream->runtime->private_data;
 465                 config_acp5x_dma(rtd, SNDRV_PCM_STREAM_CAPTURE);
 466                 acp_writel((rtd->xfer_resolution  << 3), rtd->acp5x_base + ACP_I2STDM_IRER);
 467                 if (adata->tdm_mode == TDM_ENABLE) {
 468                         acp_writel(adata->tdm_fmt, adata->acp5x_base + ACP_I2STDM_RXFRMT);
 469                         val = acp_readl(adata->acp5x_base + ACP_I2STDM_IRER);
 470                         acp_writel(val | 0x2, adata->acp5x_base + ACP_I2STDM_IRER);
 471                 }
 472         }
 473         acp_writel(1, adata->acp5x_base + ACP_EXTERNAL_INTR_ENB);
 474         return 0;
 475 }
 476
 477 static int __maybe_unused acp5x_pcm_suspend(struct device *dev)
 478 {
 479         struct i2s_dev_data *adata;
 480
 481         adata = dev_get_drvdata(dev);
 482         acp_writel(0, adata->acp5x_base + ACP_EXTERNAL_INTR_ENB);
 483         return 0;
 484 }
 485
 486 static int __maybe_unused acp5x_pcm_runtime_resume(struct device *dev)
 487 {
 488         struct i2s_dev_data *adata;
 489
 490         adata = dev_get_drvdata(dev);
 491         acp_writel(1, adata->acp5x_base + ACP_EXTERNAL_INTR_ENB);
 492         return 0;
 493 }
 494
 495 static const struct dev_pm_ops acp5x_pm_ops = {
 496         SET_RUNTIME_PM_OPS(acp5x_pcm_suspend,
 497                            acp5x_pcm_runtime_resume, NULL)
 498         SET_SYSTEM_SLEEP_PM_OPS(acp5x_pcm_suspend, acp5x_pcm_resume)
 499 };
 500
 501 static struct platform_driver acp5x_dma_driver = {
 502         .probe = acp5x_audio_probe,
 503         .remove = acp5x_audio_remove,
 504         .driver = {
 505                 .name = "acp5x_i2s_dma",
 506                 .pm = &acp5x_pm_ops,
 507         },
 508 };
 509
 510 module_platform_driver(acp5x_dma_driver);
 511
 512 MODULE_AUTHOR("Vijendar.Mukunda@amd.com");
 513 MODULE_DESCRIPTION("AMD ACP 5.x PCM Driver");
 514 MODULE_LICENSE("GPL v2");
 515 MODULE_ALIAS("platform:" DRV_NAME);