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 20static 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 39static 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 64static 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 75static 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 88static 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 97static 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 106static 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 120static 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 143static 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 176static 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 204static 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 239static 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 259static 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 273static 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 290static 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 300static 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 307static 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 317static int acp_pdm_dai_trigger(struct snd_pcm_substream *substream, 318 int cmd, struct snd_soc_dai *dai) 319{ 320 struct pdm_stream_instance *rtd; 321 int ret; 322 bool pdm_status; 323 unsigned int ch_mask; 324 325 rtd = substream->runtime->private_data; 326 ret = 0; 327 switch (substream->runtime->channels) { 328 case TWO_CH: 329 ch_mask = 0x00; 330 break; 331 default: 332 return -EINVAL; 333 } 334 switch (cmd) { 335 case SNDRV_PCM_TRIGGER_START: 336 case SNDRV_PCM_TRIGGER_RESUME: 337 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 338 rn_writel(ch_mask, rtd->acp_base + ACP_WOV_PDM_NO_OF_CHANNELS); 339 rn_writel(PDM_DECIMATION_FACTOR, rtd->acp_base + 340 ACP_WOV_PDM_DECIMATION_FACTOR); 341 rtd->bytescount = acp_pdm_get_byte_count(rtd, 342 substream->stream); 343 pdm_status = check_pdm_dma_status(rtd->acp_base); 344 if (!pdm_status) 345 ret = start_pdm_dma(rtd->acp_base); 346 break; 347 case SNDRV_PCM_TRIGGER_STOP: 348 case SNDRV_PCM_TRIGGER_SUSPEND: 349 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 350 pdm_status = check_pdm_dma_status(rtd->acp_base); 351 if (pdm_status) 352 ret = stop_pdm_dma(rtd->acp_base); 353 break; 354 default: 355 ret = -EINVAL; 356 break; 357 } 358 return ret; 359} 360 361static struct snd_soc_dai_ops acp_pdm_dai_ops = { 362 .trigger = acp_pdm_dai_trigger, 363}; 364 365static struct snd_soc_dai_driver acp_pdm_dai_driver = { 366 .capture = { 367 .rates = SNDRV_PCM_RATE_48000, 368 .formats = SNDRV_PCM_FMTBIT_S24_LE | 369 SNDRV_PCM_FMTBIT_S32_LE, 370 .channels_min = 2, 371 .channels_max = 2, 372 .rate_min = 48000, 373 .rate_max = 48000, 374 }, 375 .ops = &acp_pdm_dai_ops, 376}; 377 378static const struct snd_soc_component_driver acp_pdm_component = { 379 .name = DRV_NAME, 380 .open = acp_pdm_dma_open, 381 .close = acp_pdm_dma_close, 382 .hw_params = acp_pdm_dma_hw_params, 383 .pointer = acp_pdm_dma_pointer, 384 .mmap = acp_pdm_dma_mmap, 385 .pcm_construct = acp_pdm_dma_new, 386}; 387 388static int acp_pdm_audio_probe(struct platform_device *pdev) 389{ 390 struct resource *res; 391 struct pdm_dev_data *adata; 392 unsigned int irqflags; 393 int status; 394 395 if (!pdev->dev.platform_data) { 396 dev_err(&pdev->dev, "platform_data not retrieved\n"); 397 return -ENODEV; 398 } 399 irqflags = *((unsigned int *)(pdev->dev.platform_data)); 400 401 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 402 if (!res) { 403 dev_err(&pdev->dev, "IORESOURCE_MEM FAILED\n"); 404 return -ENODEV; 405 } 406 407 adata = devm_kzalloc(&pdev->dev, sizeof(*adata), GFP_KERNEL); 408 if (!adata) 409 return -ENOMEM; 410 411 adata->acp_base = devm_ioremap(&pdev->dev, res->start, 412 resource_size(res)); 413 if (!adata->acp_base) 414 return -ENOMEM; 415 416 res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); 417 if (!res) { 418 dev_err(&pdev->dev, "IORESOURCE_IRQ FAILED\n"); 419 return -ENODEV; 420 } 421 422 adata->pdm_irq = res->start; 423 adata->capture_stream = NULL; 424 425 dev_set_drvdata(&pdev->dev, adata); 426 status = devm_snd_soc_register_component(&pdev->dev, 427 &acp_pdm_component, 428 &acp_pdm_dai_driver, 1); 429 if (status) { 430 dev_err(&pdev->dev, "Fail to register acp pdm dai\n"); 431 432 return -ENODEV; 433 } 434 status = devm_request_irq(&pdev->dev, adata->pdm_irq, pdm_irq_handler, 435 irqflags, "ACP_PDM_IRQ", adata); 436 if (status) { 437 dev_err(&pdev->dev, "ACP PDM IRQ request failed\n"); 438 return -ENODEV; 439 } 440 pm_runtime_set_autosuspend_delay(&pdev->dev, ACP_SUSPEND_DELAY_MS); 441 pm_runtime_use_autosuspend(&pdev->dev); 442 pm_runtime_enable(&pdev->dev); 443 pm_runtime_allow(&pdev->dev); 444 return 0; 445} 446 447static int acp_pdm_audio_remove(struct platform_device *pdev) 448{ 449 pm_runtime_disable(&pdev->dev); 450 return 0; 451} 452 453static int acp_pdm_resume(struct device *dev) 454{ 455 struct pdm_dev_data *adata; 456 struct snd_pcm_runtime *runtime; 457 struct pdm_stream_instance *rtd; 458 u32 period_bytes, buffer_len; 459 460 adata = dev_get_drvdata(dev); 461 if (adata->capture_stream && adata->capture_stream->runtime) { 462 runtime = adata->capture_stream->runtime; 463 rtd = runtime->private_data; 464 period_bytes = frames_to_bytes(runtime, runtime->period_size); 465 buffer_len = frames_to_bytes(runtime, runtime->buffer_size); 466 config_acp_dma(rtd, SNDRV_PCM_STREAM_CAPTURE); 467 init_pdm_ring_buffer(MEM_WINDOW_START, buffer_len, period_bytes, 468 adata->acp_base); 469 } 470 enable_pdm_interrupts(adata->acp_base); 471 return 0; 472} 473 474static int acp_pdm_runtime_suspend(struct device *dev) 475{ 476 struct pdm_dev_data *adata; 477 478 adata = dev_get_drvdata(dev); 479 disable_pdm_interrupts(adata->acp_base); 480 481 return 0; 482} 483 484static int acp_pdm_runtime_resume(struct device *dev) 485{ 486 struct pdm_dev_data *adata; 487 488 adata = dev_get_drvdata(dev); 489 enable_pdm_interrupts(adata->acp_base); 490 return 0; 491} 492 493static const struct dev_pm_ops acp_pdm_pm_ops = { 494 .runtime_suspend = acp_pdm_runtime_suspend, 495 .runtime_resume = acp_pdm_runtime_resume, 496 .resume = acp_pdm_resume, 497}; 498 499static struct platform_driver acp_pdm_dma_driver = { 500 .probe = acp_pdm_audio_probe, 501 .remove = acp_pdm_audio_remove, 502 .driver = { 503 .name = "acp_rn_pdm_dma", 504 .pm = &acp_pdm_pm_ops, 505 }, 506}; 507 508module_platform_driver(acp_pdm_dma_driver); 509 510MODULE_AUTHOR("Vijendar.Mukunda@amd.com"); 511MODULE_DESCRIPTION("AMD ACP3x Renior PDM Driver"); 512MODULE_LICENSE("GPL v2"); 513MODULE_ALIAS("platform:" DRV_NAME); 514