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_enable(&pdev->dev); 387 pm_runtime_allow(&pdev->dev); 388 return 0; 389 } 390 391 static void acp6x_pdm_audio_remove(struct platform_device *pdev) 392 { 393 pm_runtime_disable(&pdev->dev); 394 } 395 396 static int __maybe_unused acp6x_pdm_resume(struct device *dev) 397 { 398 struct pdm_dev_data *adata; 399 struct snd_pcm_runtime *runtime; 400 struct pdm_stream_instance *rtd; 401 u32 period_bytes, buffer_len; 402 403 adata = dev_get_drvdata(dev); 404 if (adata->capture_stream && adata->capture_stream->runtime) { 405 runtime = adata->capture_stream->runtime; 406 rtd = runtime->private_data; 407 period_bytes = frames_to_bytes(runtime, runtime->period_size); 408 buffer_len = frames_to_bytes(runtime, runtime->buffer_size); 409 acp6x_config_dma(rtd, SNDRV_PCM_STREAM_CAPTURE); 410 acp6x_init_pdm_ring_buffer(PDM_MEM_WINDOW_START, buffer_len, 411 period_bytes, adata->acp6x_base); 412 } 413 acp6x_enable_pdm_interrupts(adata->acp6x_base); 414 return 0; 415 } 416 417 static int __maybe_unused acp6x_pdm_suspend(struct device *dev) 418 { 419 struct pdm_dev_data *adata; 420 421 adata = dev_get_drvdata(dev); 422 acp6x_disable_pdm_interrupts(adata->acp6x_base); 423 return 0; 424 } 425 426 static int __maybe_unused acp6x_pdm_runtime_resume(struct device *dev) 427 { 428 struct pdm_dev_data *adata; 429 430 adata = dev_get_drvdata(dev); 431 acp6x_enable_pdm_interrupts(adata->acp6x_base); 432 return 0; 433 } 434 435 static const struct dev_pm_ops acp6x_pdm_pm_ops = { 436 SET_RUNTIME_PM_OPS(acp6x_pdm_suspend, acp6x_pdm_runtime_resume, NULL) 437 SET_SYSTEM_SLEEP_PM_OPS(acp6x_pdm_suspend, acp6x_pdm_resume) 438 }; 439 440 static struct platform_driver acp6x_pdm_dma_driver = { 441 .probe = acp6x_pdm_audio_probe, 442 .remove_new = acp6x_pdm_audio_remove, 443 .driver = { 444 .name = "acp_yc_pdm_dma", 445 .pm = &acp6x_pdm_pm_ops, 446 }, 447 }; 448 449 module_platform_driver(acp6x_pdm_dma_driver); 450 451 MODULE_AUTHOR("Vijendar.Mukunda@amd.com"); 452 MODULE_DESCRIPTION("AMD ACP6x YC PDM Driver"); 453 MODULE_LICENSE("GPL v2"); 454 MODULE_ALIAS("platform:" DRV_NAME); 455