sound/soc/amd/yc/acp6x-pdm-dma.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * AMD ALSA SoC Yellow Carp PDM Driver
   4  *
   5  * Copyright 2021 Advanced Micro Devices, Inc.
   6  */
   7
   8 #include <linux/platform_device.h>
   9 #include <linux/module.h>
  10 #include <linux/bitfield.h>
  11 #include <linux/err.h>
  12 #include <linux/io.h>
  13 #include <sound/pcm_params.h>
  14 #include <sound/soc.h>
  15 #include <sound/soc-dai.h>
  16 #include <linux/pm_runtime.h>
  17
  18 #include "acp6x.h"
  19
  20 #define DRV_NAME "acp_yc_pdm_dma"
  21
  22 static int pdm_gain = 3;
  23 module_param(pdm_gain, int, 0644);
  24 MODULE_PARM_DESC(pdm_gain, "Gain control (0-3)");
  25
  26 static const struct snd_pcm_hardware acp6x_pdm_hardware_capture = {
  27         .info = SNDRV_PCM_INFO_INTERLEAVED |
  28                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
  29                 SNDRV_PCM_INFO_MMAP |
  30                 SNDRV_PCM_INFO_MMAP_VALID |
  31                 SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME,
  32         .formats = SNDRV_PCM_FMTBIT_S32_LE,
  33         .channels_min = 2,
  34         .channels_max = 2,
  35         .rates = SNDRV_PCM_RATE_48000,
  36         .rate_min = 48000,
  37         .rate_max = 48000,
  38         .buffer_bytes_max = CAPTURE_MAX_NUM_PERIODS * CAPTURE_MAX_PERIOD_SIZE,
  39         .period_bytes_min = CAPTURE_MIN_PERIOD_SIZE,
  40         .period_bytes_max = CAPTURE_MAX_PERIOD_SIZE,
  41         .periods_min = CAPTURE_MIN_NUM_PERIODS,
  42         .periods_max = CAPTURE_MAX_NUM_PERIODS,
  43 };
  44
  45 static void acp6x_init_pdm_ring_buffer(u32 physical_addr, u32 buffer_size,
  46                                        u32 watermark_size, void __iomem *acp_base)
  47 {
  48         acp6x_writel(physical_addr, acp_base + ACP_WOV_RX_RINGBUFADDR);
  49         acp6x_writel(buffer_size, acp_base + ACP_WOV_RX_RINGBUFSIZE);
  50         acp6x_writel(watermark_size, acp_base + ACP_WOV_RX_INTR_WATERMARK_SIZE);
  51         acp6x_writel(0x01, acp_base + ACPAXI2AXI_ATU_CTRL);
  52 }
  53
  54 static void acp6x_enable_pdm_clock(void __iomem *acp_base)
  55 {
  56         u32 pdm_clk_enable, pdm_ctrl;
  57
  58         pdm_clk_enable = ACP_PDM_CLK_FREQ_MASK;
  59         pdm_ctrl = 0x00;
  60
  61         acp6x_writel(pdm_clk_enable, acp_base + ACP_WOV_CLK_CTRL);
  62         pdm_ctrl = acp6x_readl(acp_base + ACP_WOV_MISC_CTRL);
  63         pdm_ctrl &= ~ACP_WOV_GAIN_CONTROL;
  64         pdm_ctrl |= FIELD_PREP(ACP_WOV_GAIN_CONTROL, clamp(pdm_gain, 0, 3));
  65         acp6x_writel(pdm_ctrl, acp_base + ACP_WOV_MISC_CTRL);
  66 }
  67
  68 static void acp6x_enable_pdm_interrupts(void __iomem *acp_base)
  69 {
  70         u32 ext_int_ctrl;
  71
  72         ext_int_ctrl = acp6x_readl(acp_base + ACP_EXTERNAL_INTR_CNTL);
  73         ext_int_ctrl |= PDM_DMA_INTR_MASK;
  74         acp6x_writel(ext_int_ctrl, acp_base + ACP_EXTERNAL_INTR_CNTL);
  75 }
  76
  77 static void acp6x_disable_pdm_interrupts(void __iomem *acp_base)
  78 {
  79         u32 ext_int_ctrl;
  80
  81         ext_int_ctrl = acp6x_readl(acp_base + ACP_EXTERNAL_INTR_CNTL);
  82         ext_int_ctrl &= ~PDM_DMA_INTR_MASK;
  83         acp6x_writel(ext_int_ctrl, acp_base + ACP_EXTERNAL_INTR_CNTL);
  84 }
  85
  86 static bool acp6x_check_pdm_dma_status(void __iomem *acp_base)
  87 {
  88         bool pdm_dma_status;
  89         u32 pdm_enable, pdm_dma_enable;
  90
  91         pdm_dma_status = false;
  92         pdm_enable = acp6x_readl(acp_base + ACP_WOV_PDM_ENABLE);
  93         pdm_dma_enable = acp6x_readl(acp_base + ACP_WOV_PDM_DMA_ENABLE);
  94         if ((pdm_enable & ACP_PDM_ENABLE) && (pdm_dma_enable & ACP_PDM_DMA_EN_STATUS))
  95                 pdm_dma_status = true;
  96
  97         return pdm_dma_status;
  98 }
  99
 100 static int acp6x_start_pdm_dma(void __iomem *acp_base)
 101 {
 102         u32 pdm_enable;
 103         u32 pdm_dma_enable;
 104         int timeout;
 105
 106         pdm_enable = 0x01;
 107         pdm_dma_enable  = 0x01;
 108
 109         acp6x_enable_pdm_clock(acp_base);
 110         acp6x_writel(pdm_enable, acp_base + ACP_WOV_PDM_ENABLE);
 111         acp6x_writel(pdm_dma_enable, acp_base + ACP_WOV_PDM_DMA_ENABLE);
 112         timeout = 0;
 113         while (++timeout < ACP_COUNTER) {
 114                 pdm_dma_enable = acp6x_readl(acp_base + ACP_WOV_PDM_DMA_ENABLE);
 115                 if ((pdm_dma_enable & 0x02) == ACP_PDM_DMA_EN_STATUS)
 116                         return 0;
 117                 udelay(DELAY_US);
 118         }
 119         return -ETIMEDOUT;
 120 }
 121
 122 static int acp6x_stop_pdm_dma(void __iomem *acp_base)
 123 {
 124         u32 pdm_enable, pdm_dma_enable;
 125         int timeout;
 126
 127         pdm_enable = 0x00;
 128         pdm_dma_enable  = 0x00;
 129
 130         pdm_enable = acp6x_readl(acp_base + ACP_WOV_PDM_ENABLE);
 131         pdm_dma_enable = acp6x_readl(acp_base + ACP_WOV_PDM_DMA_ENABLE);
 132         if (pdm_dma_enable & 0x01) {
 133                 pdm_dma_enable = 0x02;
 134                 acp6x_writel(pdm_dma_enable, acp_base + ACP_WOV_PDM_DMA_ENABLE);
 135                 timeout = 0;
 136                 while (++timeout < ACP_COUNTER) {
 137                         pdm_dma_enable = acp6x_readl(acp_base + ACP_WOV_PDM_DMA_ENABLE);
 138                         if ((pdm_dma_enable & 0x02) == 0x00)
 139                                 break;
 140                         udelay(DELAY_US);
 141                 }
 142                 if (timeout == ACP_COUNTER)
 143                         return -ETIMEDOUT;
 144         }
 145         if (pdm_enable == ACP_PDM_ENABLE) {
 146                 pdm_enable = ACP_PDM_DISABLE;
 147                 acp6x_writel(pdm_enable, acp_base + ACP_WOV_PDM_ENABLE);
 148         }
 149         acp6x_writel(0x01, acp_base + ACP_WOV_PDM_FIFO_FLUSH);
 150         return 0;
 151 }
 152
 153 static void acp6x_config_dma(struct pdm_stream_instance *rtd, int direction)
 154 {
 155         u16 page_idx;
 156         u32 low, high, val;
 157         dma_addr_t addr;
 158
 159         addr = rtd->dma_addr;
 160         val = PDM_PTE_OFFSET;
 161
 162         /* Group Enable */
 163         acp6x_writel(ACP_SRAM_PTE_OFFSET | BIT(31), rtd->acp6x_base +
 164                      ACPAXI2AXI_ATU_BASE_ADDR_GRP_1);
 165         acp6x_writel(PAGE_SIZE_4K_ENABLE, rtd->acp6x_base +
 166                      ACPAXI2AXI_ATU_PAGE_SIZE_GRP_1);
 167         for (page_idx = 0; page_idx < rtd->num_pages; page_idx++) {
 168                 /* Load the low address of page int ACP SRAM through SRBM */
 169                 low = lower_32_bits(addr);
 170                 high = upper_32_bits(addr);
 171
 172                 acp6x_writel(low, rtd->acp6x_base + ACP_SCRATCH_REG_0 + val);
 173                 high |= BIT(31);
 174                 acp6x_writel(high, rtd->acp6x_base + ACP_SCRATCH_REG_0 + val + 4);
 175                 val += 8;
 176                 addr += PAGE_SIZE;
 177         }
 178 }
 179
 180 static int acp6x_pdm_dma_open(struct snd_soc_component *component,
 181                               struct snd_pcm_substream *substream)
 182 {
 183         struct snd_pcm_runtime *runtime;
 184         struct pdm_dev_data *adata;
 185         struct pdm_stream_instance *pdm_data;
 186         int ret;
 187
 188         runtime = substream->runtime;
 189         adata = dev_get_drvdata(component->dev);
 190         pdm_data = kzalloc(sizeof(*pdm_data), GFP_KERNEL);
 191         if (!pdm_data)
 192                 return -EINVAL;
 193
 194         if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
 195                 runtime->hw = acp6x_pdm_hardware_capture;
 196
 197         ret = snd_pcm_hw_constraint_integer(runtime,
 198                                             SNDRV_PCM_HW_PARAM_PERIODS);
 199         if (ret < 0) {
 200                 dev_err(component->dev, "set integer constraint failed\n");
 201                 kfree(pdm_data);
 202                 return ret;
 203         }
 204
 205         acp6x_enable_pdm_interrupts(adata->acp6x_base);
 206
 207         if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
 208                 adata->capture_stream = substream;
 209
 210         pdm_data->acp6x_base = adata->acp6x_base;
 211         runtime->private_data = pdm_data;
 212         return ret;
 213 }
 214
 215 static int acp6x_pdm_dma_hw_params(struct snd_soc_component *component,
 216                                    struct snd_pcm_substream *substream,
 217                                    struct snd_pcm_hw_params *params)
 218 {
 219         struct pdm_stream_instance *rtd;
 220         size_t size, period_bytes;
 221
 222         rtd = substream->runtime->private_data;
 223         if (!rtd)
 224                 return -EINVAL;
 225         size = params_buffer_bytes(params);
 226         period_bytes = params_period_bytes(params);
 227         rtd->dma_addr = substream->runtime->dma_addr;
 228         rtd->num_pages = (PAGE_ALIGN(size) >> PAGE_SHIFT);
 229         acp6x_config_dma(rtd, substream->stream);
 230         acp6x_init_pdm_ring_buffer(PDM_MEM_WINDOW_START, size,
 231                                    period_bytes, rtd->acp6x_base);
 232         return 0;
 233 }
 234
 235 static u64 acp6x_pdm_get_byte_count(struct pdm_stream_instance *rtd,
 236                                     int direction)
 237 {
 238         union acp_pdm_dma_count byte_count;
 239
 240         byte_count.bcount.high =
 241                         acp6x_readl(rtd->acp6x_base + ACP_WOV_RX_LINEARPOSITIONCNTR_HIGH);
 242         byte_count.bcount.low =
 243                         acp6x_readl(rtd->acp6x_base + ACP_WOV_RX_LINEARPOSITIONCNTR_LOW);
 244         return byte_count.bytescount;
 245 }
 246
 247 static snd_pcm_uframes_t acp6x_pdm_dma_pointer(struct snd_soc_component *comp,
 248                                                struct snd_pcm_substream *stream)
 249 {
 250         struct pdm_stream_instance *rtd;
 251         u32 pos, buffersize;
 252         u64 bytescount;
 253
 254         rtd = stream->runtime->private_data;
 255         buffersize = frames_to_bytes(stream->runtime,
 256                                      stream->runtime->buffer_size);
 257         bytescount = acp6x_pdm_get_byte_count(rtd, stream->stream);
 258         if (bytescount > rtd->bytescount)
 259                 bytescount -= rtd->bytescount;
 260         pos = do_div(bytescount, buffersize);
 261         return bytes_to_frames(stream->runtime, pos);
 262 }
 263
 264 static int acp6x_pdm_dma_new(struct snd_soc_component *component,
 265                              struct snd_soc_pcm_runtime *rtd)
 266 {
 267         struct device *parent = component->dev->parent;
 268
 269         snd_pcm_set_managed_buffer_all(rtd->pcm, SNDRV_DMA_TYPE_DEV,
 270                                        parent, MIN_BUFFER, MAX_BUFFER);
 271         return 0;
 272 }
 273
 274 static int acp6x_pdm_dma_close(struct snd_soc_component *component,
 275                                struct snd_pcm_substream *substream)
 276 {
 277         struct pdm_dev_data *adata = dev_get_drvdata(component->dev);
 278
 279         acp6x_disable_pdm_interrupts(adata->acp6x_base);
 280         adata->capture_stream = NULL;
 281         return 0;
 282 }
 283
 284 static int acp6x_pdm_dai_trigger(struct snd_pcm_substream *substream,
 285                                  int cmd, struct snd_soc_dai *dai)
 286 {
 287         struct pdm_stream_instance *rtd;
 288         int ret;
 289         bool pdm_status;
 290         unsigned int ch_mask;
 291
 292         rtd = substream->runtime->private_data;
 293         ret = 0;
 294         switch (substream->runtime->channels) {
 295         case TWO_CH:
 296                 ch_mask = 0x00;
 297                 break;
 298         default:
 299                 return -EINVAL;
 300         }
 301         switch (cmd) {
 302         case SNDRV_PCM_TRIGGER_START:
 303         case SNDRV_PCM_TRIGGER_RESUME:
 304         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 305                 acp6x_writel(ch_mask, rtd->acp6x_base + ACP_WOV_PDM_NO_OF_CHANNELS);
 306                 acp6x_writel(PDM_DECIMATION_FACTOR, rtd->acp6x_base +
 307                              ACP_WOV_PDM_DECIMATION_FACTOR);
 308                 rtd->bytescount = acp6x_pdm_get_byte_count(rtd, substream->stream);
 309                 pdm_status = acp6x_check_pdm_dma_status(rtd->acp6x_base);
 310                 if (!pdm_status)
 311                         ret = acp6x_start_pdm_dma(rtd->acp6x_base);
 312                 break;
 313         case SNDRV_PCM_TRIGGER_STOP:
 314         case SNDRV_PCM_TRIGGER_SUSPEND:
 315         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 316                 pdm_status = acp6x_check_pdm_dma_status(rtd->acp6x_base);
 317                 if (pdm_status)
 318                         ret = acp6x_stop_pdm_dma(rtd->acp6x_base);
 319                 break;
 320         default:
 321                 ret = -EINVAL;
 322                 break;
 323         }
 324         return ret;
 325 }
 326
 327 static const struct snd_soc_dai_ops acp6x_pdm_dai_ops = {
 328         .trigger   = acp6x_pdm_dai_trigger,
 329 };
 330
 331 static struct snd_soc_dai_driver acp6x_pdm_dai_driver = {
 332         .capture = {
 333                 .rates = SNDRV_PCM_RATE_48000,
 334                 .formats = SNDRV_PCM_FMTBIT_S32_LE,
 335                 .channels_min = 2,
 336                 .channels_max = 2,
 337                 .rate_min = 48000,
 338                 .rate_max = 48000,
 339         },
 340         .ops = &acp6x_pdm_dai_ops,
 341 };
 342
 343 static const struct snd_soc_component_driver acp6x_pdm_component = {
 344         .name                   = DRV_NAME,
 345         .open                   = acp6x_pdm_dma_open,
 346         .close                  = acp6x_pdm_dma_close,
 347         .hw_params              = acp6x_pdm_dma_hw_params,
 348         .pointer                = acp6x_pdm_dma_pointer,
 349         .pcm_construct          = acp6x_pdm_dma_new,
 350         .legacy_dai_naming      = 1,
 351 };
 352
 353 static int acp6x_pdm_audio_probe(struct platform_device *pdev)
 354 {
 355         struct resource *res;
 356         struct pdm_dev_data *adata;
 357         int status;
 358
 359         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 360         if (!res) {
 361                 dev_err(&pdev->dev, "IORESOURCE_MEM FAILED\n");
 362                 return -ENODEV;
 363         }
 364
 365         adata = devm_kzalloc(&pdev->dev, sizeof(*adata), GFP_KERNEL);
 366         if (!adata)
 367                 return -ENOMEM;
 368
 369         adata->acp6x_base = devm_ioremap(&pdev->dev, res->start, resource_size(res));
 370         if (!adata->acp6x_base)
 371                 return -ENOMEM;
 372
 373         adata->capture_stream = NULL;
 374
 375         dev_set_drvdata(&pdev->dev, adata);
 376         status = devm_snd_soc_register_component(&pdev->dev,
 377                                                  &acp6x_pdm_component,
 378                                                  &acp6x_pdm_dai_driver, 1);
 379         if (status) {
 380                 dev_err(&pdev->dev, "Fail to register acp pdm dai\n");
 381
 382                 return -ENODEV;
 383         }
 384         pm_runtime_set_autosuspend_delay(&pdev->dev, ACP_SUSPEND_DELAY_MS);
 385         pm_runtime_use_autosuspend(&pdev->dev);
 386         pm_runtime_mark_last_busy(&pdev->dev);
 387         pm_runtime_set_active(&pdev->dev);
 388         pm_runtime_enable(&pdev->dev);
 389         return 0;
 390 }
 391
 392 static void acp6x_pdm_audio_remove(struct platform_device *pdev)
 393 {
 394         pm_runtime_disable(&pdev->dev);
 395 }
 396
 397 static int __maybe_unused acp6x_pdm_resume(struct device *dev)
 398 {
 399         struct pdm_dev_data *adata;
 400         struct snd_pcm_runtime *runtime;
 401         struct pdm_stream_instance *rtd;
 402         u32 period_bytes, buffer_len;
 403
 404         adata = dev_get_drvdata(dev);
 405         if (adata->capture_stream && adata->capture_stream->runtime) {
 406                 runtime = adata->capture_stream->runtime;
 407                 rtd = runtime->private_data;
 408                 period_bytes = frames_to_bytes(runtime, runtime->period_size);
 409                 buffer_len = frames_to_bytes(runtime, runtime->buffer_size);
 410                 acp6x_config_dma(rtd, SNDRV_PCM_STREAM_CAPTURE);
 411                 acp6x_init_pdm_ring_buffer(PDM_MEM_WINDOW_START, buffer_len,
 412                                            period_bytes, adata->acp6x_base);
 413         }
 414         acp6x_enable_pdm_interrupts(adata->acp6x_base);
 415         return 0;
 416 }
 417
 418 static int __maybe_unused acp6x_pdm_suspend(struct device *dev)
 419 {
 420         struct pdm_dev_data *adata;
 421
 422         adata = dev_get_drvdata(dev);
 423         acp6x_disable_pdm_interrupts(adata->acp6x_base);
 424         return 0;
 425 }
 426
 427 static int __maybe_unused acp6x_pdm_runtime_resume(struct device *dev)
 428 {
 429         struct pdm_dev_data *adata;
 430
 431         adata = dev_get_drvdata(dev);
 432         acp6x_enable_pdm_interrupts(adata->acp6x_base);
 433         return 0;
 434 }
 435
 436 static const struct dev_pm_ops acp6x_pdm_pm_ops = {
 437         SET_RUNTIME_PM_OPS(acp6x_pdm_suspend, acp6x_pdm_runtime_resume, NULL)
 438         SET_SYSTEM_SLEEP_PM_OPS(acp6x_pdm_suspend, acp6x_pdm_resume)
 439 };
 440
 441 static struct platform_driver acp6x_pdm_dma_driver = {
 442         .probe = acp6x_pdm_audio_probe,
 443         .remove = acp6x_pdm_audio_remove,
 444         .driver = {
 445                 .name = "acp_yc_pdm_dma",
 446                 .pm = &acp6x_pdm_pm_ops,
 447         },
 448 };
 449
 450 module_platform_driver(acp6x_pdm_dma_driver);
 451
 452 MODULE_AUTHOR("Vijendar.Mukunda@amd.com");
 453 MODULE_DESCRIPTION("AMD ACP6x YC PDM Driver");
 454 MODULE_LICENSE("GPL v2");
 455 MODULE_ALIAS("platform:" DRV_NAME);