1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * AMD ALSA SoC Pink Sardine PDM Driver 4 * 5 * Copyright 2022 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 "acp63.h" 19 20 #define DRV_NAME "acp_ps_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 acp63_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 acp63_init_pdm_ring_buffer(u32 physical_addr, u32 buffer_size, 46 u32 watermark_size, void __iomem *acp_base) 47 { 48 acp63_writel(physical_addr, acp_base + ACP_WOV_RX_RINGBUFADDR); 49 acp63_writel(buffer_size, acp_base + ACP_WOV_RX_RINGBUFSIZE); 50 acp63_writel(watermark_size, acp_base + ACP_WOV_RX_INTR_WATERMARK_SIZE); 51 acp63_writel(0x01, acp_base + ACPAXI2AXI_ATU_CTRL); 52 } 53 54 static void acp63_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 acp63_writel(pdm_clk_enable, acp_base + ACP_WOV_CLK_CTRL); 62 pdm_ctrl = acp63_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 acp63_writel(pdm_ctrl, acp_base + ACP_WOV_MISC_CTRL); 66 } 67 68 static void acp63_enable_pdm_interrupts(struct pdm_dev_data *adata) 69 { 70 u32 ext_int_ctrl; 71 72 mutex_lock(adata->acp_lock); 73 ext_int_ctrl = acp63_readl(adata->acp63_base + ACP_EXTERNAL_INTR_CNTL); 74 ext_int_ctrl |= PDM_DMA_INTR_MASK; 75 acp63_writel(ext_int_ctrl, adata->acp63_base + ACP_EXTERNAL_INTR_CNTL); 76 mutex_unlock(adata->acp_lock); 77 } 78 79 static void acp63_disable_pdm_interrupts(struct pdm_dev_data *adata) 80 { 81 u32 ext_int_ctrl; 82 83 mutex_lock(adata->acp_lock); 84 ext_int_ctrl = acp63_readl(adata->acp63_base + ACP_EXTERNAL_INTR_CNTL); 85 ext_int_ctrl &= ~PDM_DMA_INTR_MASK; 86 acp63_writel(ext_int_ctrl, adata->acp63_base + ACP_EXTERNAL_INTR_CNTL); 87 mutex_unlock(adata->acp_lock); 88 } 89 90 static bool acp63_check_pdm_dma_status(void __iomem *acp_base) 91 { 92 bool pdm_dma_status; 93 u32 pdm_enable, pdm_dma_enable; 94 95 pdm_dma_status = false; 96 pdm_enable = acp63_readl(acp_base + ACP_WOV_PDM_ENABLE); 97 pdm_dma_enable = acp63_readl(acp_base + ACP_WOV_PDM_DMA_ENABLE); 98 if ((pdm_enable & ACP_PDM_ENABLE) && (pdm_dma_enable & ACP_PDM_DMA_EN_STATUS)) 99 pdm_dma_status = true; 100 101 return pdm_dma_status; 102 } 103 104 static int acp63_start_pdm_dma(void __iomem *acp_base) 105 { 106 u32 pdm_enable; 107 u32 pdm_dma_enable; 108 int timeout; 109 110 pdm_enable = 0x01; 111 pdm_dma_enable = 0x01; 112 113 acp63_enable_pdm_clock(acp_base); 114 acp63_writel(pdm_enable, acp_base + ACP_WOV_PDM_ENABLE); 115 acp63_writel(pdm_dma_enable, acp_base + ACP_WOV_PDM_DMA_ENABLE); 116 timeout = 0; 117 while (++timeout < ACP_COUNTER) { 118 pdm_dma_enable = acp63_readl(acp_base + ACP_WOV_PDM_DMA_ENABLE); 119 if ((pdm_dma_enable & 0x02) == ACP_PDM_DMA_EN_STATUS) 120 return 0; 121 udelay(DELAY_US); 122 } 123 return -ETIMEDOUT; 124 } 125 126 static int acp63_stop_pdm_dma(void __iomem *acp_base) 127 { 128 u32 pdm_enable, pdm_dma_enable; 129 int timeout; 130 131 pdm_enable = 0x00; 132 pdm_dma_enable = 0x00; 133 134 pdm_enable = acp63_readl(acp_base + ACP_WOV_PDM_ENABLE); 135 pdm_dma_enable = acp63_readl(acp_base + ACP_WOV_PDM_DMA_ENABLE); 136 if (pdm_dma_enable & 0x01) { 137 pdm_dma_enable = 0x02; 138 acp63_writel(pdm_dma_enable, acp_base + ACP_WOV_PDM_DMA_ENABLE); 139 timeout = 0; 140 while (++timeout < ACP_COUNTER) { 141 pdm_dma_enable = acp63_readl(acp_base + ACP_WOV_PDM_DMA_ENABLE); 142 if ((pdm_dma_enable & 0x02) == 0x00) 143 break; 144 udelay(DELAY_US); 145 } 146 if (timeout == ACP_COUNTER) 147 return -ETIMEDOUT; 148 } 149 if (pdm_enable == ACP_PDM_ENABLE) { 150 pdm_enable = ACP_PDM_DISABLE; 151 acp63_writel(pdm_enable, acp_base + ACP_WOV_PDM_ENABLE); 152 } 153 acp63_writel(0x01, acp_base + ACP_WOV_PDM_FIFO_FLUSH); 154 return 0; 155 } 156 157 static void acp63_config_dma(struct pdm_stream_instance *rtd, int direction) 158 { 159 u16 page_idx; 160 u32 low, high, val; 161 dma_addr_t addr; 162 163 addr = rtd->dma_addr; 164 val = PDM_PTE_OFFSET; 165 166 /* Group Enable */ 167 acp63_writel(ACP_SRAM_PTE_OFFSET | BIT(31), rtd->acp63_base + 168 ACPAXI2AXI_ATU_BASE_ADDR_GRP_1); 169 acp63_writel(PAGE_SIZE_4K_ENABLE, rtd->acp63_base + 170 ACPAXI2AXI_ATU_PAGE_SIZE_GRP_1); 171 for (page_idx = 0; page_idx < rtd->num_pages; page_idx++) { 172 /* Load the low address of page int ACP SRAM through SRBM */ 173 low = lower_32_bits(addr); 174 high = upper_32_bits(addr); 175 176 acp63_writel(low, rtd->acp63_base + ACP_SCRATCH_REG_0 + val); 177 high |= BIT(31); 178 acp63_writel(high, rtd->acp63_base + ACP_SCRATCH_REG_0 + val + 4); 179 val += 8; 180 addr += PAGE_SIZE; 181 } 182 } 183 184 static int acp63_pdm_dma_open(struct snd_soc_component *component, 185 struct snd_pcm_substream *substream) 186 { 187 struct snd_pcm_runtime *runtime; 188 struct pdm_dev_data *adata; 189 struct pdm_stream_instance *pdm_data; 190 int ret; 191 192 runtime = substream->runtime; 193 adata = dev_get_drvdata(component->dev); 194 pdm_data = kzalloc(sizeof(*pdm_data), GFP_KERNEL); 195 if (!pdm_data) 196 return -EINVAL; 197 198 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 199 runtime->hw = acp63_pdm_hardware_capture; 200 201 ret = snd_pcm_hw_constraint_integer(runtime, 202 SNDRV_PCM_HW_PARAM_PERIODS); 203 if (ret < 0) { 204 dev_err(component->dev, "set integer constraint failed\n"); 205 kfree(pdm_data); 206 return ret; 207 } 208 209 acp63_enable_pdm_interrupts(adata); 210 211 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 212 adata->capture_stream = substream; 213 214 pdm_data->acp63_base = adata->acp63_base; 215 runtime->private_data = pdm_data; 216 return ret; 217 } 218 219 static int acp63_pdm_dma_hw_params(struct snd_soc_component *component, 220 struct snd_pcm_substream *substream, 221 struct snd_pcm_hw_params *params) 222 { 223 struct pdm_stream_instance *rtd; 224 size_t size, period_bytes; 225 226 rtd = substream->runtime->private_data; 227 if (!rtd) 228 return -EINVAL; 229 size = params_buffer_bytes(params); 230 period_bytes = params_period_bytes(params); 231 rtd->dma_addr = substream->runtime->dma_addr; 232 rtd->num_pages = (PAGE_ALIGN(size) >> PAGE_SHIFT); 233 acp63_config_dma(rtd, substream->stream); 234 acp63_init_pdm_ring_buffer(PDM_MEM_WINDOW_START, size, 235 period_bytes, rtd->acp63_base); 236 return 0; 237 } 238 239 static u64 acp63_pdm_get_byte_count(struct pdm_stream_instance *rtd, 240 int direction) 241 { 242 u32 high, low; 243 u64 byte_count; 244 245 high = acp63_readl(rtd->acp63_base + ACP_WOV_RX_LINEARPOSITIONCNTR_HIGH); 246 byte_count = high; 247 low = acp63_readl(rtd->acp63_base + ACP_WOV_RX_LINEARPOSITIONCNTR_LOW); 248 byte_count = (byte_count << 32) | low; 249 return byte_count; 250 } 251 252 static snd_pcm_uframes_t acp63_pdm_dma_pointer(struct snd_soc_component *comp, 253 struct snd_pcm_substream *stream) 254 { 255 struct pdm_stream_instance *rtd; 256 u32 pos, buffersize; 257 u64 bytescount; 258 259 rtd = stream->runtime->private_data; 260 buffersize = frames_to_bytes(stream->runtime, 261 stream->runtime->buffer_size); 262 bytescount = acp63_pdm_get_byte_count(rtd, stream->stream); 263 if (bytescount > rtd->bytescount) 264 bytescount -= rtd->bytescount; 265 pos = do_div(bytescount, buffersize); 266 return bytes_to_frames(stream->runtime, pos); 267 } 268 269 static int acp63_pdm_dma_new(struct snd_soc_component *component, 270 struct snd_soc_pcm_runtime *rtd) 271 { 272 struct device *parent = component->dev->parent; 273 274 snd_pcm_set_managed_buffer_all(rtd->pcm, SNDRV_DMA_TYPE_DEV, 275 parent, MIN_BUFFER, MAX_BUFFER); 276 return 0; 277 } 278 279 static int acp63_pdm_dma_close(struct snd_soc_component *component, 280 struct snd_pcm_substream *substream) 281 { 282 struct pdm_dev_data *adata = dev_get_drvdata(component->dev); 283 struct snd_pcm_runtime *runtime = substream->runtime; 284 285 acp63_disable_pdm_interrupts(adata); 286 adata->capture_stream = NULL; 287 kfree(runtime->private_data); 288 return 0; 289 } 290 291 static int acp63_pdm_dai_trigger(struct snd_pcm_substream *substream, 292 int cmd, struct snd_soc_dai *dai) 293 { 294 struct pdm_stream_instance *rtd; 295 int ret; 296 bool pdm_status; 297 unsigned int ch_mask; 298 299 rtd = substream->runtime->private_data; 300 ret = 0; 301 switch (substream->runtime->channels) { 302 case TWO_CH: 303 ch_mask = 0x00; 304 break; 305 default: 306 return -EINVAL; 307 } 308 switch (cmd) { 309 case SNDRV_PCM_TRIGGER_START: 310 case SNDRV_PCM_TRIGGER_RESUME: 311 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 312 acp63_writel(ch_mask, rtd->acp63_base + ACP_WOV_PDM_NO_OF_CHANNELS); 313 acp63_writel(PDM_DECIMATION_FACTOR, rtd->acp63_base + 314 ACP_WOV_PDM_DECIMATION_FACTOR); 315 rtd->bytescount = acp63_pdm_get_byte_count(rtd, substream->stream); 316 pdm_status = acp63_check_pdm_dma_status(rtd->acp63_base); 317 if (!pdm_status) 318 ret = acp63_start_pdm_dma(rtd->acp63_base); 319 break; 320 case SNDRV_PCM_TRIGGER_STOP: 321 case SNDRV_PCM_TRIGGER_SUSPEND: 322 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 323 pdm_status = acp63_check_pdm_dma_status(rtd->acp63_base); 324 if (pdm_status) 325 ret = acp63_stop_pdm_dma(rtd->acp63_base); 326 break; 327 default: 328 ret = -EINVAL; 329 break; 330 } 331 return ret; 332 } 333 334 static const struct snd_soc_dai_ops acp63_pdm_dai_ops = { 335 .trigger = acp63_pdm_dai_trigger, 336 }; 337 338 static struct snd_soc_dai_driver acp63_pdm_dai_driver = { 339 .name = "acp_ps_pdm_dma.0", 340 .capture = { 341 .rates = SNDRV_PCM_RATE_48000, 342 .formats = SNDRV_PCM_FMTBIT_S32_LE, 343 .channels_min = 2, 344 .channels_max = 2, 345 .rate_min = 48000, 346 .rate_max = 48000, 347 }, 348 .ops = &acp63_pdm_dai_ops, 349 }; 350 351 static const struct snd_soc_component_driver acp63_pdm_component = { 352 .name = DRV_NAME, 353 .open = acp63_pdm_dma_open, 354 .close = acp63_pdm_dma_close, 355 .hw_params = acp63_pdm_dma_hw_params, 356 .pointer = acp63_pdm_dma_pointer, 357 .pcm_construct = acp63_pdm_dma_new, 358 }; 359 360 static int acp63_pdm_audio_probe(struct platform_device *pdev) 361 { 362 struct resource *res; 363 struct pdm_dev_data *adata; 364 int status; 365 366 if (!pdev->dev.platform_data) { 367 dev_err(&pdev->dev, "platform_data not retrieved\n"); 368 return -ENODEV; 369 } 370 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 371 if (!res) { 372 dev_err(&pdev->dev, "IORESOURCE_MEM FAILED\n"); 373 return -ENODEV; 374 } 375 376 adata = devm_kzalloc(&pdev->dev, sizeof(*adata), GFP_KERNEL); 377 if (!adata) 378 return -ENOMEM; 379 380 adata->acp63_base = devm_ioremap(&pdev->dev, res->start, resource_size(res)); 381 if (!adata->acp63_base) 382 return -ENOMEM; 383 384 adata->capture_stream = NULL; 385 adata->acp_lock = pdev->dev.platform_data; 386 dev_set_drvdata(&pdev->dev, adata); 387 status = devm_snd_soc_register_component(&pdev->dev, 388 &acp63_pdm_component, 389 &acp63_pdm_dai_driver, 1); 390 if (status) { 391 dev_err(&pdev->dev, "Fail to register acp pdm dai\n"); 392 393 return -ENODEV; 394 } 395 pm_runtime_set_autosuspend_delay(&pdev->dev, ACP_SUSPEND_DELAY_MS); 396 pm_runtime_use_autosuspend(&pdev->dev); 397 pm_runtime_enable(&pdev->dev); 398 pm_runtime_allow(&pdev->dev); 399 return 0; 400 } 401 402 static int acp63_pdm_audio_remove(struct platform_device *pdev) 403 { 404 pm_runtime_disable(&pdev->dev); 405 return 0; 406 } 407 408 static int __maybe_unused acp63_pdm_resume(struct device *dev) 409 { 410 struct pdm_dev_data *adata; 411 struct snd_pcm_runtime *runtime; 412 struct pdm_stream_instance *rtd; 413 u32 period_bytes, buffer_len; 414 415 adata = dev_get_drvdata(dev); 416 if (adata->capture_stream && adata->capture_stream->runtime) { 417 runtime = adata->capture_stream->runtime; 418 rtd = runtime->private_data; 419 period_bytes = frames_to_bytes(runtime, runtime->period_size); 420 buffer_len = frames_to_bytes(runtime, runtime->buffer_size); 421 acp63_config_dma(rtd, SNDRV_PCM_STREAM_CAPTURE); 422 acp63_init_pdm_ring_buffer(PDM_MEM_WINDOW_START, buffer_len, 423 period_bytes, adata->acp63_base); 424 } 425 acp63_enable_pdm_interrupts(adata); 426 return 0; 427 } 428 429 static int __maybe_unused acp63_pdm_suspend(struct device *dev) 430 { 431 struct pdm_dev_data *adata; 432 433 adata = dev_get_drvdata(dev); 434 acp63_disable_pdm_interrupts(adata); 435 return 0; 436 } 437 438 static int __maybe_unused acp63_pdm_runtime_resume(struct device *dev) 439 { 440 struct pdm_dev_data *adata; 441 442 adata = dev_get_drvdata(dev); 443 acp63_enable_pdm_interrupts(adata); 444 return 0; 445 } 446 447 static const struct dev_pm_ops acp63_pdm_pm_ops = { 448 SET_RUNTIME_PM_OPS(acp63_pdm_suspend, acp63_pdm_runtime_resume, NULL) 449 SET_SYSTEM_SLEEP_PM_OPS(acp63_pdm_suspend, acp63_pdm_resume) 450 }; 451 452 static struct platform_driver acp63_pdm_dma_driver = { 453 .probe = acp63_pdm_audio_probe, 454 .remove = acp63_pdm_audio_remove, 455 .driver = { 456 .name = "acp_ps_pdm_dma", 457 .pm = &acp63_pdm_pm_ops, 458 }, 459 }; 460 461 module_platform_driver(acp63_pdm_dma_driver); 462 463 MODULE_AUTHOR("Syed.SabaKareem@amd.com"); 464 MODULE_DESCRIPTION("AMD PINK SARDINE PDM Driver"); 465 MODULE_LICENSE("GPL v2"); 466 MODULE_ALIAS("platform:" DRV_NAME); 467