1 // SPDX-License-Identifier: GPL-2.0+ 2 // 3 // AMD ALSA SoC PDM Driver 4 // 5 //Copyright 2020 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 "rn_acp3x.h" 17 18 #define DRV_NAME "acp_rn_pdm_dma" 19 20 static const struct snd_pcm_hardware acp_pdm_hardware_capture = { 21 .info = SNDRV_PCM_INFO_INTERLEAVED | 22 SNDRV_PCM_INFO_BLOCK_TRANSFER | 23 SNDRV_PCM_INFO_MMAP | 24 SNDRV_PCM_INFO_MMAP_VALID | 25 SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME, 26 .formats = SNDRV_PCM_FMTBIT_S32_LE, 27 .channels_min = 2, 28 .channels_max = 2, 29 .rates = SNDRV_PCM_RATE_48000, 30 .rate_min = 48000, 31 .rate_max = 48000, 32 .buffer_bytes_max = CAPTURE_MAX_NUM_PERIODS * CAPTURE_MAX_PERIOD_SIZE, 33 .period_bytes_min = CAPTURE_MIN_PERIOD_SIZE, 34 .period_bytes_max = CAPTURE_MAX_PERIOD_SIZE, 35 .periods_min = CAPTURE_MIN_NUM_PERIODS, 36 .periods_max = CAPTURE_MAX_NUM_PERIODS, 37 }; 38 39 static irqreturn_t pdm_irq_handler(int irq, void *dev_id) 40 { 41 struct pdm_dev_data *rn_pdm_data; 42 u16 cap_flag; 43 u32 val; 44 45 rn_pdm_data = dev_id; 46 if (!rn_pdm_data) 47 return IRQ_NONE; 48 49 cap_flag = 0; 50 val = rn_readl(rn_pdm_data->acp_base + ACP_EXTERNAL_INTR_STAT); 51 if ((val & BIT(PDM_DMA_STAT)) && rn_pdm_data->capture_stream) { 52 rn_writel(BIT(PDM_DMA_STAT), rn_pdm_data->acp_base + 53 ACP_EXTERNAL_INTR_STAT); 54 snd_pcm_period_elapsed(rn_pdm_data->capture_stream); 55 cap_flag = 1; 56 } 57 58 if (cap_flag) 59 return IRQ_HANDLED; 60 else 61 return IRQ_NONE; 62 } 63 64 static void init_pdm_ring_buffer(u32 physical_addr, 65 u32 buffer_size, 66 u32 watermark_size, 67 void __iomem *acp_base) 68 { 69 rn_writel(physical_addr, acp_base + ACP_WOV_RX_RINGBUFADDR); 70 rn_writel(buffer_size, acp_base + ACP_WOV_RX_RINGBUFSIZE); 71 rn_writel(watermark_size, acp_base + ACP_WOV_RX_INTR_WATERMARK_SIZE); 72 rn_writel(0x01, acp_base + ACPAXI2AXI_ATU_CTRL); 73 } 74 75 static void enable_pdm_clock(void __iomem *acp_base) 76 { 77 u32 pdm_clk_enable, pdm_ctrl; 78 79 pdm_clk_enable = ACP_PDM_CLK_FREQ_MASK; 80 pdm_ctrl = 0x00; 81 82 rn_writel(pdm_clk_enable, acp_base + ACP_WOV_CLK_CTRL); 83 pdm_ctrl = rn_readl(acp_base + ACP_WOV_MISC_CTRL); 84 pdm_ctrl |= ACP_WOV_MISC_CTRL_MASK; 85 rn_writel(pdm_ctrl, acp_base + ACP_WOV_MISC_CTRL); 86 } 87 88 static void enable_pdm_interrupts(void __iomem *acp_base) 89 { 90 u32 ext_int_ctrl; 91 92 ext_int_ctrl = rn_readl(acp_base + ACP_EXTERNAL_INTR_CNTL); 93 ext_int_ctrl |= PDM_DMA_INTR_MASK; 94 rn_writel(ext_int_ctrl, acp_base + ACP_EXTERNAL_INTR_CNTL); 95 } 96 97 static void disable_pdm_interrupts(void __iomem *acp_base) 98 { 99 u32 ext_int_ctrl; 100 101 ext_int_ctrl = rn_readl(acp_base + ACP_EXTERNAL_INTR_CNTL); 102 ext_int_ctrl |= ~PDM_DMA_INTR_MASK; 103 rn_writel(ext_int_ctrl, acp_base + ACP_EXTERNAL_INTR_CNTL); 104 } 105 106 static bool check_pdm_dma_status(void __iomem *acp_base) 107 { 108 bool pdm_dma_status; 109 u32 pdm_enable, pdm_dma_enable; 110 111 pdm_dma_status = false; 112 pdm_enable = rn_readl(acp_base + ACP_WOV_PDM_ENABLE); 113 pdm_dma_enable = rn_readl(acp_base + ACP_WOV_PDM_DMA_ENABLE); 114 if ((pdm_enable & ACP_PDM_ENABLE) && (pdm_dma_enable & 115 ACP_PDM_DMA_EN_STATUS)) 116 pdm_dma_status = true; 117 return pdm_dma_status; 118 } 119 120 static int start_pdm_dma(void __iomem *acp_base) 121 { 122 u32 pdm_enable; 123 u32 pdm_dma_enable; 124 int timeout; 125 126 pdm_enable = 0x01; 127 pdm_dma_enable = 0x01; 128 129 enable_pdm_clock(acp_base); 130 rn_writel(pdm_enable, acp_base + ACP_WOV_PDM_ENABLE); 131 rn_writel(pdm_dma_enable, acp_base + ACP_WOV_PDM_DMA_ENABLE); 132 pdm_dma_enable = 0x00; 133 timeout = 0; 134 while (++timeout < ACP_COUNTER) { 135 pdm_dma_enable = rn_readl(acp_base + ACP_WOV_PDM_DMA_ENABLE); 136 if ((pdm_dma_enable & 0x02) == ACP_PDM_DMA_EN_STATUS) 137 return 0; 138 udelay(DELAY_US); 139 } 140 return -ETIMEDOUT; 141 } 142 143 static int stop_pdm_dma(void __iomem *acp_base) 144 { 145 u32 pdm_enable, pdm_dma_enable; 146 int timeout; 147 148 pdm_enable = 0x00; 149 pdm_dma_enable = 0x00; 150 151 pdm_enable = rn_readl(acp_base + ACP_WOV_PDM_ENABLE); 152 pdm_dma_enable = rn_readl(acp_base + ACP_WOV_PDM_DMA_ENABLE); 153 if (pdm_dma_enable & 0x01) { 154 pdm_dma_enable = 0x02; 155 rn_writel(pdm_dma_enable, acp_base + ACP_WOV_PDM_DMA_ENABLE); 156 pdm_dma_enable = 0x00; 157 timeout = 0; 158 while (++timeout < ACP_COUNTER) { 159 pdm_dma_enable = rn_readl(acp_base + 160 ACP_WOV_PDM_DMA_ENABLE); 161 if ((pdm_dma_enable & 0x02) == 0x00) 162 break; 163 udelay(DELAY_US); 164 } 165 if (timeout == ACP_COUNTER) 166 return -ETIMEDOUT; 167 } 168 if (pdm_enable == ACP_PDM_ENABLE) { 169 pdm_enable = ACP_PDM_DISABLE; 170 rn_writel(pdm_enable, acp_base + ACP_WOV_PDM_ENABLE); 171 } 172 rn_writel(0x01, acp_base + ACP_WOV_PDM_FIFO_FLUSH); 173 return 0; 174 } 175 176 static void config_acp_dma(struct pdm_stream_instance *rtd, int direction) 177 { 178 u16 page_idx; 179 u32 low, high, val; 180 dma_addr_t addr; 181 182 addr = rtd->dma_addr; 183 val = 0; 184 185 /* Group Enable */ 186 rn_writel(ACP_SRAM_PTE_OFFSET | BIT(31), rtd->acp_base + 187 ACPAXI2AXI_ATU_BASE_ADDR_GRP_1); 188 rn_writel(PAGE_SIZE_4K_ENABLE, rtd->acp_base + 189 ACPAXI2AXI_ATU_PAGE_SIZE_GRP_1); 190 191 for (page_idx = 0; page_idx < rtd->num_pages; page_idx++) { 192 /* Load the low address of page int ACP SRAM through SRBM */ 193 low = lower_32_bits(addr); 194 high = upper_32_bits(addr); 195 196 rn_writel(low, rtd->acp_base + ACP_SCRATCH_REG_0 + val); 197 high |= BIT(31); 198 rn_writel(high, rtd->acp_base + ACP_SCRATCH_REG_0 + val + 4); 199 val += 8; 200 addr += PAGE_SIZE; 201 } 202 } 203 204 static int acp_pdm_dma_open(struct snd_soc_component *component, 205 struct snd_pcm_substream *substream) 206 { 207 struct snd_pcm_runtime *runtime; 208 struct pdm_dev_data *adata; 209 struct pdm_stream_instance *pdm_data; 210 int ret; 211 212 runtime = substream->runtime; 213 adata = dev_get_drvdata(component->dev); 214 pdm_data = kzalloc(sizeof(*pdm_data), GFP_KERNEL); 215 if (!pdm_data) 216 return -EINVAL; 217 218 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 219 runtime->hw = acp_pdm_hardware_capture; 220 221 ret = snd_pcm_hw_constraint_integer(runtime, 222 SNDRV_PCM_HW_PARAM_PERIODS); 223 if (ret < 0) { 224 dev_err(component->dev, "set integer constraint failed\n"); 225 kfree(pdm_data); 226 return ret; 227 } 228 229 enable_pdm_interrupts(adata->acp_base); 230 231 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 232 adata->capture_stream = substream; 233 234 pdm_data->acp_base = adata->acp_base; 235 runtime->private_data = pdm_data; 236 return ret; 237 } 238 239 static int acp_pdm_dma_hw_params(struct snd_soc_component *component, 240 struct snd_pcm_substream *substream, 241 struct snd_pcm_hw_params *params) 242 { 243 struct pdm_stream_instance *rtd; 244 size_t size, period_bytes; 245 246 rtd = substream->runtime->private_data; 247 if (!rtd) 248 return -EINVAL; 249 size = params_buffer_bytes(params); 250 period_bytes = params_period_bytes(params); 251 rtd->dma_addr = substream->dma_buffer.addr; 252 rtd->num_pages = (PAGE_ALIGN(size) >> PAGE_SHIFT); 253 config_acp_dma(rtd, substream->stream); 254 init_pdm_ring_buffer(MEM_WINDOW_START, size, period_bytes, 255 rtd->acp_base); 256 return 0; 257 } 258 259 static u64 acp_pdm_get_byte_count(struct pdm_stream_instance *rtd, 260 int direction) 261 { 262 union acp_pdm_dma_count byte_count; 263 264 byte_count.bcount.high = 265 rn_readl(rtd->acp_base + 266 ACP_WOV_RX_LINEARPOSITIONCNTR_HIGH); 267 byte_count.bcount.low = 268 rn_readl(rtd->acp_base + 269 ACP_WOV_RX_LINEARPOSITIONCNTR_LOW); 270 return byte_count.bytescount; 271 } 272 273 static snd_pcm_uframes_t acp_pdm_dma_pointer(struct snd_soc_component *comp, 274 struct snd_pcm_substream *stream) 275 { 276 struct pdm_stream_instance *rtd; 277 u32 pos, buffersize; 278 u64 bytescount; 279 280 rtd = stream->runtime->private_data; 281 buffersize = frames_to_bytes(stream->runtime, 282 stream->runtime->buffer_size); 283 bytescount = acp_pdm_get_byte_count(rtd, stream->stream); 284 if (bytescount > rtd->bytescount) 285 bytescount -= rtd->bytescount; 286 pos = do_div(bytescount, buffersize); 287 return bytes_to_frames(stream->runtime, pos); 288 } 289 290 static int acp_pdm_dma_new(struct snd_soc_component *component, 291 struct snd_soc_pcm_runtime *rtd) 292 { 293 struct device *parent = component->dev->parent; 294 295 snd_pcm_set_managed_buffer_all(rtd->pcm, SNDRV_DMA_TYPE_DEV, 296 parent, MIN_BUFFER, MAX_BUFFER); 297 return 0; 298 } 299 300 static int acp_pdm_dma_mmap(struct snd_soc_component *component, 301 struct snd_pcm_substream *substream, 302 struct vm_area_struct *vma) 303 { 304 return snd_pcm_lib_default_mmap(substream, vma); 305 } 306 307 static int acp_pdm_dma_close(struct snd_soc_component *component, 308 struct snd_pcm_substream *substream) 309 { 310 struct pdm_dev_data *adata = dev_get_drvdata(component->dev); 311 312 disable_pdm_interrupts(adata->acp_base); 313 adata->capture_stream = NULL; 314 return 0; 315 } 316 317 static int acp_pdm_dai_hw_params(struct snd_pcm_substream *substream, 318 struct snd_pcm_hw_params *params, 319 struct snd_soc_dai *dai) 320 { 321 struct pdm_stream_instance *rtd; 322 unsigned int ch_mask; 323 324 rtd = substream->runtime->private_data; 325 switch (params_channels(params)) { 326 case TWO_CH: 327 ch_mask = 0x00; 328 break; 329 default: 330 return -EINVAL; 331 } 332 rn_writel(ch_mask, rtd->acp_base + ACP_WOV_PDM_NO_OF_CHANNELS); 333 rn_writel(PDM_DECIMATION_FACTOR, rtd->acp_base + 334 ACP_WOV_PDM_DECIMATION_FACTOR); 335 return 0; 336 } 337 338 static int acp_pdm_dai_trigger(struct snd_pcm_substream *substream, 339 int cmd, struct snd_soc_dai *dai) 340 { 341 struct pdm_stream_instance *rtd; 342 int ret; 343 bool pdm_status; 344 345 rtd = substream->runtime->private_data; 346 ret = 0; 347 switch (cmd) { 348 case SNDRV_PCM_TRIGGER_START: 349 case SNDRV_PCM_TRIGGER_RESUME: 350 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 351 rtd->bytescount = acp_pdm_get_byte_count(rtd, 352 substream->stream); 353 pdm_status = check_pdm_dma_status(rtd->acp_base); 354 if (!pdm_status) 355 ret = start_pdm_dma(rtd->acp_base); 356 break; 357 case SNDRV_PCM_TRIGGER_STOP: 358 case SNDRV_PCM_TRIGGER_SUSPEND: 359 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 360 pdm_status = check_pdm_dma_status(rtd->acp_base); 361 if (pdm_status) 362 ret = stop_pdm_dma(rtd->acp_base); 363 break; 364 default: 365 ret = -EINVAL; 366 break; 367 } 368 return ret; 369 } 370 371 static struct snd_soc_dai_ops acp_pdm_dai_ops = { 372 .hw_params = acp_pdm_dai_hw_params, 373 .trigger = acp_pdm_dai_trigger, 374 }; 375 376 static struct snd_soc_dai_driver acp_pdm_dai_driver = { 377 .capture = { 378 .rates = SNDRV_PCM_RATE_48000, 379 .formats = SNDRV_PCM_FMTBIT_S24_LE | 380 SNDRV_PCM_FMTBIT_S32_LE, 381 .channels_min = 2, 382 .channels_max = 2, 383 .rate_min = 48000, 384 .rate_max = 48000, 385 }, 386 .ops = &acp_pdm_dai_ops, 387 }; 388 389 static const struct snd_soc_component_driver acp_pdm_component = { 390 .name = DRV_NAME, 391 .open = acp_pdm_dma_open, 392 .close = acp_pdm_dma_close, 393 .hw_params = acp_pdm_dma_hw_params, 394 .pointer = acp_pdm_dma_pointer, 395 .mmap = acp_pdm_dma_mmap, 396 .pcm_construct = acp_pdm_dma_new, 397 }; 398 399 static int acp_pdm_audio_probe(struct platform_device *pdev) 400 { 401 struct resource *res; 402 struct pdm_dev_data *adata; 403 unsigned int irqflags; 404 int status; 405 406 if (!pdev->dev.platform_data) { 407 dev_err(&pdev->dev, "platform_data not retrieved\n"); 408 return -ENODEV; 409 } 410 irqflags = *((unsigned int *)(pdev->dev.platform_data)); 411 412 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 413 if (!res) { 414 dev_err(&pdev->dev, "IORESOURCE_MEM FAILED\n"); 415 return -ENODEV; 416 } 417 418 adata = devm_kzalloc(&pdev->dev, sizeof(*adata), GFP_KERNEL); 419 if (!adata) 420 return -ENOMEM; 421 422 adata->acp_base = devm_ioremap(&pdev->dev, res->start, 423 resource_size(res)); 424 if (!adata->acp_base) 425 return -ENOMEM; 426 427 res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); 428 if (!res) { 429 dev_err(&pdev->dev, "IORESOURCE_IRQ FAILED\n"); 430 return -ENODEV; 431 } 432 433 adata->pdm_irq = res->start; 434 adata->capture_stream = NULL; 435 436 dev_set_drvdata(&pdev->dev, adata); 437 status = devm_snd_soc_register_component(&pdev->dev, 438 &acp_pdm_component, 439 &acp_pdm_dai_driver, 1); 440 if (status) { 441 dev_err(&pdev->dev, "Fail to register acp pdm dai\n"); 442 443 return -ENODEV; 444 } 445 status = devm_request_irq(&pdev->dev, adata->pdm_irq, pdm_irq_handler, 446 irqflags, "ACP_PDM_IRQ", adata); 447 if (status) { 448 dev_err(&pdev->dev, "ACP PDM IRQ request failed\n"); 449 return -ENODEV; 450 } 451 pm_runtime_set_autosuspend_delay(&pdev->dev, ACP_SUSPEND_DELAY_MS); 452 pm_runtime_use_autosuspend(&pdev->dev); 453 pm_runtime_enable(&pdev->dev); 454 pm_runtime_allow(&pdev->dev); 455 return 0; 456 } 457 458 static int acp_pdm_audio_remove(struct platform_device *pdev) 459 { 460 pm_runtime_disable(&pdev->dev); 461 return 0; 462 } 463 464 static int acp_pdm_resume(struct device *dev) 465 { 466 struct pdm_dev_data *adata; 467 struct snd_pcm_runtime *runtime; 468 struct pdm_stream_instance *rtd; 469 u32 period_bytes, buffer_len; 470 471 adata = dev_get_drvdata(dev); 472 if (adata->capture_stream && adata->capture_stream->runtime) { 473 runtime = adata->capture_stream->runtime; 474 rtd = runtime->private_data; 475 period_bytes = frames_to_bytes(runtime, runtime->period_size); 476 buffer_len = frames_to_bytes(runtime, runtime->buffer_size); 477 config_acp_dma(rtd, SNDRV_PCM_STREAM_CAPTURE); 478 init_pdm_ring_buffer(MEM_WINDOW_START, buffer_len, period_bytes, 479 adata->acp_base); 480 } 481 enable_pdm_interrupts(adata->acp_base); 482 return 0; 483 } 484 485 static int acp_pdm_runtime_suspend(struct device *dev) 486 { 487 struct pdm_dev_data *adata; 488 489 adata = dev_get_drvdata(dev); 490 disable_pdm_interrupts(adata->acp_base); 491 492 return 0; 493 } 494 495 static int acp_pdm_runtime_resume(struct device *dev) 496 { 497 struct pdm_dev_data *adata; 498 499 adata = dev_get_drvdata(dev); 500 enable_pdm_interrupts(adata->acp_base); 501 return 0; 502 } 503 504 static const struct dev_pm_ops acp_pdm_pm_ops = { 505 .runtime_suspend = acp_pdm_runtime_suspend, 506 .runtime_resume = acp_pdm_runtime_resume, 507 .resume = acp_pdm_resume, 508 }; 509 510 static struct platform_driver acp_pdm_dma_driver = { 511 .probe = acp_pdm_audio_probe, 512 .remove = acp_pdm_audio_remove, 513 .driver = { 514 .name = "acp_rn_pdm_dma", 515 .pm = &acp_pdm_pm_ops, 516 }, 517 }; 518 519 module_platform_driver(acp_pdm_dma_driver); 520 521 MODULE_AUTHOR("Vijendar.Mukunda@amd.com"); 522 MODULE_DESCRIPTION("AMD ACP3x Renior PDM Driver"); 523 MODULE_LICENSE("GPL v2"); 524 MODULE_ALIAS("platform:" DRV_NAME); 525