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/bitfield.h> 10 #include <linux/err.h> 11 #include <linux/io.h> 12 #include <linux/pm_runtime.h> 13 #include <sound/pcm_params.h> 14 #include <sound/soc.h> 15 #include <sound/soc-dai.h> 16 17 #include "rn_acp3x.h" 18 19 #define DRV_NAME "acp_rn_pdm_dma" 20 21 static int pdm_gain = 3; 22 module_param(pdm_gain, int, 0644); 23 MODULE_PARM_DESC(pdm_gain, "Gain control (0-3)"); 24 25 static const struct snd_pcm_hardware acp_pdm_hardware_capture = { 26 .info = SNDRV_PCM_INFO_INTERLEAVED | 27 SNDRV_PCM_INFO_BLOCK_TRANSFER | 28 SNDRV_PCM_INFO_MMAP | 29 SNDRV_PCM_INFO_MMAP_VALID | 30 SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME, 31 .formats = SNDRV_PCM_FMTBIT_S32_LE, 32 .channels_min = 2, 33 .channels_max = 2, 34 .rates = SNDRV_PCM_RATE_48000, 35 .rate_min = 48000, 36 .rate_max = 48000, 37 .buffer_bytes_max = CAPTURE_MAX_NUM_PERIODS * CAPTURE_MAX_PERIOD_SIZE, 38 .period_bytes_min = CAPTURE_MIN_PERIOD_SIZE, 39 .period_bytes_max = CAPTURE_MAX_PERIOD_SIZE, 40 .periods_min = CAPTURE_MIN_NUM_PERIODS, 41 .periods_max = CAPTURE_MAX_NUM_PERIODS, 42 }; 43 44 static irqreturn_t pdm_irq_handler(int irq, void *dev_id) 45 { 46 struct pdm_dev_data *rn_pdm_data; 47 u16 cap_flag; 48 u32 val; 49 50 rn_pdm_data = dev_id; 51 if (!rn_pdm_data) 52 return IRQ_NONE; 53 54 cap_flag = 0; 55 val = rn_readl(rn_pdm_data->acp_base + ACP_EXTERNAL_INTR_STAT); 56 if ((val & BIT(PDM_DMA_STAT)) && rn_pdm_data->capture_stream) { 57 rn_writel(BIT(PDM_DMA_STAT), rn_pdm_data->acp_base + 58 ACP_EXTERNAL_INTR_STAT); 59 snd_pcm_period_elapsed(rn_pdm_data->capture_stream); 60 cap_flag = 1; 61 } 62 63 if (cap_flag) 64 return IRQ_HANDLED; 65 else 66 return IRQ_NONE; 67 } 68 69 static void init_pdm_ring_buffer(u32 physical_addr, 70 u32 buffer_size, 71 u32 watermark_size, 72 void __iomem *acp_base) 73 { 74 rn_writel(physical_addr, acp_base + ACP_WOV_RX_RINGBUFADDR); 75 rn_writel(buffer_size, acp_base + ACP_WOV_RX_RINGBUFSIZE); 76 rn_writel(watermark_size, acp_base + ACP_WOV_RX_INTR_WATERMARK_SIZE); 77 rn_writel(0x01, acp_base + ACPAXI2AXI_ATU_CTRL); 78 } 79 80 static void enable_pdm_clock(void __iomem *acp_base) 81 { 82 u32 pdm_clk_enable, pdm_ctrl; 83 84 pdm_clk_enable = ACP_PDM_CLK_FREQ_MASK; 85 86 rn_writel(pdm_clk_enable, acp_base + ACP_WOV_CLK_CTRL); 87 pdm_ctrl = rn_readl(acp_base + ACP_WOV_MISC_CTRL); 88 pdm_ctrl &= ~ACP_WOV_GAIN_CONTROL; 89 pdm_ctrl |= FIELD_PREP(ACP_WOV_GAIN_CONTROL, clamp(pdm_gain, 0, 3)); 90 rn_writel(pdm_ctrl, acp_base + ACP_WOV_MISC_CTRL); 91 } 92 93 static void enable_pdm_interrupts(void __iomem *acp_base) 94 { 95 u32 ext_int_ctrl; 96 97 ext_int_ctrl = rn_readl(acp_base + ACP_EXTERNAL_INTR_CNTL); 98 ext_int_ctrl |= PDM_DMA_INTR_MASK; 99 rn_writel(ext_int_ctrl, acp_base + ACP_EXTERNAL_INTR_CNTL); 100 } 101 102 static void disable_pdm_interrupts(void __iomem *acp_base) 103 { 104 u32 ext_int_ctrl; 105 106 ext_int_ctrl = rn_readl(acp_base + ACP_EXTERNAL_INTR_CNTL); 107 ext_int_ctrl |= ~PDM_DMA_INTR_MASK; 108 rn_writel(ext_int_ctrl, acp_base + ACP_EXTERNAL_INTR_CNTL); 109 } 110 111 static bool check_pdm_dma_status(void __iomem *acp_base) 112 { 113 bool pdm_dma_status; 114 u32 pdm_enable, pdm_dma_enable; 115 116 pdm_dma_status = false; 117 pdm_enable = rn_readl(acp_base + ACP_WOV_PDM_ENABLE); 118 pdm_dma_enable = rn_readl(acp_base + ACP_WOV_PDM_DMA_ENABLE); 119 if ((pdm_enable & ACP_PDM_ENABLE) && (pdm_dma_enable & 120 ACP_PDM_DMA_EN_STATUS)) 121 pdm_dma_status = true; 122 return pdm_dma_status; 123 } 124 125 static int start_pdm_dma(void __iomem *acp_base) 126 { 127 u32 pdm_enable; 128 u32 pdm_dma_enable; 129 int timeout; 130 131 pdm_enable = 0x01; 132 pdm_dma_enable = 0x01; 133 134 enable_pdm_clock(acp_base); 135 rn_writel(pdm_enable, acp_base + ACP_WOV_PDM_ENABLE); 136 rn_writel(pdm_dma_enable, acp_base + ACP_WOV_PDM_DMA_ENABLE); 137 timeout = 0; 138 while (++timeout < ACP_COUNTER) { 139 pdm_dma_enable = rn_readl(acp_base + ACP_WOV_PDM_DMA_ENABLE); 140 if ((pdm_dma_enable & 0x02) == ACP_PDM_DMA_EN_STATUS) 141 return 0; 142 udelay(DELAY_US); 143 } 144 return -ETIMEDOUT; 145 } 146 147 static int stop_pdm_dma(void __iomem *acp_base) 148 { 149 u32 pdm_enable, pdm_dma_enable; 150 int timeout; 151 152 pdm_enable = rn_readl(acp_base + ACP_WOV_PDM_ENABLE); 153 pdm_dma_enable = rn_readl(acp_base + ACP_WOV_PDM_DMA_ENABLE); 154 if (pdm_dma_enable & 0x01) { 155 pdm_dma_enable = 0x02; 156 rn_writel(pdm_dma_enable, acp_base + ACP_WOV_PDM_DMA_ENABLE); 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->runtime->dma_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_close(struct snd_soc_component *component, 301 struct snd_pcm_substream *substream) 302 { 303 struct pdm_dev_data *adata = dev_get_drvdata(component->dev); 304 305 disable_pdm_interrupts(adata->acp_base); 306 adata->capture_stream = NULL; 307 return 0; 308 } 309 310 static int acp_pdm_dai_trigger(struct snd_pcm_substream *substream, 311 int cmd, struct snd_soc_dai *dai) 312 { 313 struct pdm_stream_instance *rtd; 314 int ret; 315 bool pdm_status; 316 unsigned int ch_mask; 317 318 rtd = substream->runtime->private_data; 319 ret = 0; 320 switch (substream->runtime->channels) { 321 case TWO_CH: 322 ch_mask = 0x00; 323 break; 324 default: 325 return -EINVAL; 326 } 327 switch (cmd) { 328 case SNDRV_PCM_TRIGGER_START: 329 case SNDRV_PCM_TRIGGER_RESUME: 330 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 331 rn_writel(ch_mask, rtd->acp_base + ACP_WOV_PDM_NO_OF_CHANNELS); 332 rn_writel(PDM_DECIMATION_FACTOR, rtd->acp_base + 333 ACP_WOV_PDM_DECIMATION_FACTOR); 334 rtd->bytescount = acp_pdm_get_byte_count(rtd, 335 substream->stream); 336 pdm_status = check_pdm_dma_status(rtd->acp_base); 337 if (!pdm_status) 338 ret = start_pdm_dma(rtd->acp_base); 339 break; 340 case SNDRV_PCM_TRIGGER_STOP: 341 case SNDRV_PCM_TRIGGER_SUSPEND: 342 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 343 pdm_status = check_pdm_dma_status(rtd->acp_base); 344 if (pdm_status) 345 ret = stop_pdm_dma(rtd->acp_base); 346 break; 347 default: 348 ret = -EINVAL; 349 break; 350 } 351 return ret; 352 } 353 354 static const struct snd_soc_dai_ops acp_pdm_dai_ops = { 355 .trigger = acp_pdm_dai_trigger, 356 }; 357 358 static struct snd_soc_dai_driver acp_pdm_dai_driver = { 359 .capture = { 360 .rates = SNDRV_PCM_RATE_48000, 361 .formats = SNDRV_PCM_FMTBIT_S24_LE | 362 SNDRV_PCM_FMTBIT_S32_LE, 363 .channels_min = 2, 364 .channels_max = 2, 365 .rate_min = 48000, 366 .rate_max = 48000, 367 }, 368 .ops = &acp_pdm_dai_ops, 369 }; 370 371 static const struct snd_soc_component_driver acp_pdm_component = { 372 .name = DRV_NAME, 373 .open = acp_pdm_dma_open, 374 .close = acp_pdm_dma_close, 375 .hw_params = acp_pdm_dma_hw_params, 376 .pointer = acp_pdm_dma_pointer, 377 .pcm_construct = acp_pdm_dma_new, 378 .legacy_dai_naming = 1, 379 }; 380 381 static int acp_pdm_audio_probe(struct platform_device *pdev) 382 { 383 struct resource *res; 384 struct pdm_dev_data *adata; 385 unsigned int irqflags; 386 int status; 387 388 if (!pdev->dev.platform_data) { 389 dev_err(&pdev->dev, "platform_data not retrieved\n"); 390 return -ENODEV; 391 } 392 irqflags = *((unsigned int *)(pdev->dev.platform_data)); 393 394 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 395 if (!res) { 396 dev_err(&pdev->dev, "IORESOURCE_MEM FAILED\n"); 397 return -ENODEV; 398 } 399 400 adata = devm_kzalloc(&pdev->dev, sizeof(*adata), GFP_KERNEL); 401 if (!adata) 402 return -ENOMEM; 403 404 adata->acp_base = devm_ioremap(&pdev->dev, res->start, 405 resource_size(res)); 406 if (!adata->acp_base) 407 return -ENOMEM; 408 409 status = platform_get_irq(pdev, 0); 410 if (status < 0) 411 return status; 412 adata->pdm_irq = status; 413 414 adata->capture_stream = NULL; 415 416 dev_set_drvdata(&pdev->dev, adata); 417 status = devm_snd_soc_register_component(&pdev->dev, 418 &acp_pdm_component, 419 &acp_pdm_dai_driver, 1); 420 if (status) { 421 dev_err(&pdev->dev, "Fail to register acp pdm dai\n"); 422 423 return -ENODEV; 424 } 425 status = devm_request_irq(&pdev->dev, adata->pdm_irq, pdm_irq_handler, 426 irqflags, "ACP_PDM_IRQ", adata); 427 if (status) { 428 dev_err(&pdev->dev, "ACP PDM IRQ request failed\n"); 429 return -ENODEV; 430 } 431 pm_runtime_set_autosuspend_delay(&pdev->dev, ACP_SUSPEND_DELAY_MS); 432 pm_runtime_use_autosuspend(&pdev->dev); 433 pm_runtime_mark_last_busy(&pdev->dev); 434 pm_runtime_set_active(&pdev->dev); 435 pm_runtime_enable(&pdev->dev); 436 return 0; 437 } 438 439 static void acp_pdm_audio_remove(struct platform_device *pdev) 440 { 441 pm_runtime_disable(&pdev->dev); 442 } 443 444 static int acp_pdm_resume(struct device *dev) 445 { 446 struct pdm_dev_data *adata; 447 struct snd_pcm_runtime *runtime; 448 struct pdm_stream_instance *rtd; 449 u32 period_bytes, buffer_len; 450 451 adata = dev_get_drvdata(dev); 452 if (adata->capture_stream && adata->capture_stream->runtime) { 453 runtime = adata->capture_stream->runtime; 454 rtd = runtime->private_data; 455 period_bytes = frames_to_bytes(runtime, runtime->period_size); 456 buffer_len = frames_to_bytes(runtime, runtime->buffer_size); 457 config_acp_dma(rtd, SNDRV_PCM_STREAM_CAPTURE); 458 init_pdm_ring_buffer(MEM_WINDOW_START, buffer_len, period_bytes, 459 adata->acp_base); 460 } 461 enable_pdm_interrupts(adata->acp_base); 462 return 0; 463 } 464 465 static int acp_pdm_runtime_suspend(struct device *dev) 466 { 467 struct pdm_dev_data *adata; 468 469 adata = dev_get_drvdata(dev); 470 disable_pdm_interrupts(adata->acp_base); 471 472 return 0; 473 } 474 475 static int acp_pdm_runtime_resume(struct device *dev) 476 { 477 struct pdm_dev_data *adata; 478 479 adata = dev_get_drvdata(dev); 480 enable_pdm_interrupts(adata->acp_base); 481 return 0; 482 } 483 484 static const struct dev_pm_ops acp_pdm_pm_ops = { 485 .runtime_suspend = acp_pdm_runtime_suspend, 486 .runtime_resume = acp_pdm_runtime_resume, 487 .resume = acp_pdm_resume, 488 }; 489 490 static struct platform_driver acp_pdm_dma_driver = { 491 .probe = acp_pdm_audio_probe, 492 .remove = acp_pdm_audio_remove, 493 .driver = { 494 .name = "acp_rn_pdm_dma", 495 .pm = &acp_pdm_pm_ops, 496 }, 497 }; 498 499 module_platform_driver(acp_pdm_dma_driver); 500 501 MODULE_AUTHOR("Vijendar.Mukunda@amd.com"); 502 MODULE_DESCRIPTION("AMD ACP3x Renior PDM Driver"); 503 MODULE_LICENSE("GPL v2"); 504 MODULE_ALIAS("platform:" DRV_NAME); 505