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 acp63_init_pdm_ring_buffer(u32 physical_addr,u32 buffer_size,u32 watermark_size,void __iomem * acp_base)45 static void acp63_init_pdm_ring_buffer(u32 physical_addr, u32 buffer_size, 46 u32 watermark_size, void __iomem *acp_base) 47 { 48 writel(physical_addr, acp_base + ACP_WOV_RX_RINGBUFADDR); 49 writel(buffer_size, acp_base + ACP_WOV_RX_RINGBUFSIZE); 50 writel(watermark_size, acp_base + ACP_WOV_RX_INTR_WATERMARK_SIZE); 51 writel(0x01, acp_base + ACPAXI2AXI_ATU_CTRL); 52 } 53 acp63_enable_pdm_clock(void __iomem * acp_base)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 writel(pdm_clk_enable, acp_base + ACP_WOV_CLK_CTRL); 62 pdm_ctrl = 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 writel(pdm_ctrl, acp_base + ACP_WOV_MISC_CTRL); 66 } 67 acp63_enable_pdm_interrupts(struct pdm_dev_data * adata)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 = readl(adata->acp63_base + ACP_EXTERNAL_INTR_CNTL); 74 ext_int_ctrl |= PDM_DMA_INTR_MASK; 75 writel(ext_int_ctrl, adata->acp63_base + ACP_EXTERNAL_INTR_CNTL); 76 mutex_unlock(adata->acp_lock); 77 } 78 acp63_disable_pdm_interrupts(struct pdm_dev_data * adata)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 = readl(adata->acp63_base + ACP_EXTERNAL_INTR_CNTL); 85 ext_int_ctrl &= ~PDM_DMA_INTR_MASK; 86 writel(ext_int_ctrl, adata->acp63_base + ACP_EXTERNAL_INTR_CNTL); 87 mutex_unlock(adata->acp_lock); 88 } 89 acp63_check_pdm_dma_status(void __iomem * acp_base)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 = readl(acp_base + ACP_WOV_PDM_ENABLE); 97 pdm_dma_enable = 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 acp63_start_pdm_dma(void __iomem * acp_base)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 writel(pdm_enable, acp_base + ACP_WOV_PDM_ENABLE); 115 writel(pdm_dma_enable, acp_base + ACP_WOV_PDM_DMA_ENABLE); 116 timeout = 0; 117 while (++timeout < ACP_COUNTER) { 118 pdm_dma_enable = 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 acp63_stop_pdm_dma(void __iomem * acp_base)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 = readl(acp_base + ACP_WOV_PDM_ENABLE); 135 pdm_dma_enable = readl(acp_base + ACP_WOV_PDM_DMA_ENABLE); 136 if (pdm_dma_enable & 0x01) { 137 pdm_dma_enable = 0x02; 138 writel(pdm_dma_enable, acp_base + ACP_WOV_PDM_DMA_ENABLE); 139 timeout = 0; 140 while (++timeout < ACP_COUNTER) { 141 pdm_dma_enable = 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 writel(pdm_enable, acp_base + ACP_WOV_PDM_ENABLE); 152 } 153 writel(0x01, acp_base + ACP_WOV_PDM_FIFO_FLUSH); 154 return 0; 155 } 156 acp63_config_dma(struct pdm_stream_instance * rtd,int direction)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 writel(ACP_SRAM_PTE_OFFSET | BIT(31), rtd->acp63_base + ACPAXI2AXI_ATU_BASE_ADDR_GRP_1); 168 writel(PAGE_SIZE_4K_ENABLE, rtd->acp63_base + ACPAXI2AXI_ATU_PAGE_SIZE_GRP_1); 169 for (page_idx = 0; page_idx < rtd->num_pages; page_idx++) { 170 /* Load the low address of page int ACP SRAM through SRBM */ 171 low = lower_32_bits(addr); 172 high = upper_32_bits(addr); 173 174 writel(low, rtd->acp63_base + ACP_SCRATCH_REG_0 + val); 175 high |= BIT(31); 176 writel(high, rtd->acp63_base + ACP_SCRATCH_REG_0 + val + 4); 177 val += 8; 178 addr += PAGE_SIZE; 179 } 180 } 181 acp63_pdm_dma_open(struct snd_soc_component * component,struct snd_pcm_substream * substream)182 static int acp63_pdm_dma_open(struct snd_soc_component *component, 183 struct snd_pcm_substream *substream) 184 { 185 struct snd_pcm_runtime *runtime; 186 struct pdm_dev_data *adata; 187 struct pdm_stream_instance *pdm_data; 188 int ret; 189 190 runtime = substream->runtime; 191 adata = dev_get_drvdata(component->dev); 192 pdm_data = kzalloc(sizeof(*pdm_data), GFP_KERNEL); 193 if (!pdm_data) 194 return -EINVAL; 195 196 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 197 runtime->hw = acp63_pdm_hardware_capture; 198 199 ret = snd_pcm_hw_constraint_integer(runtime, 200 SNDRV_PCM_HW_PARAM_PERIODS); 201 if (ret < 0) { 202 dev_err(component->dev, "set integer constraint failed\n"); 203 kfree(pdm_data); 204 return ret; 205 } 206 207 acp63_enable_pdm_interrupts(adata); 208 209 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 210 adata->capture_stream = substream; 211 212 pdm_data->acp63_base = adata->acp63_base; 213 runtime->private_data = pdm_data; 214 return ret; 215 } 216 acp63_pdm_dma_hw_params(struct snd_soc_component * component,struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params)217 static int acp63_pdm_dma_hw_params(struct snd_soc_component *component, 218 struct snd_pcm_substream *substream, 219 struct snd_pcm_hw_params *params) 220 { 221 struct pdm_stream_instance *rtd; 222 size_t size, period_bytes; 223 224 rtd = substream->runtime->private_data; 225 if (!rtd) 226 return -EINVAL; 227 size = params_buffer_bytes(params); 228 period_bytes = params_period_bytes(params); 229 rtd->dma_addr = substream->runtime->dma_addr; 230 rtd->num_pages = (PAGE_ALIGN(size) >> PAGE_SHIFT); 231 acp63_config_dma(rtd, substream->stream); 232 acp63_init_pdm_ring_buffer(PDM_MEM_WINDOW_START, size, 233 period_bytes, rtd->acp63_base); 234 return 0; 235 } 236 acp63_pdm_get_byte_count(struct pdm_stream_instance * rtd,int direction)237 static u64 acp63_pdm_get_byte_count(struct pdm_stream_instance *rtd, 238 int direction) 239 { 240 u32 high, low; 241 u64 byte_count; 242 243 high = readl(rtd->acp63_base + ACP_WOV_RX_LINEARPOSITIONCNTR_HIGH); 244 byte_count = high; 245 low = readl(rtd->acp63_base + ACP_WOV_RX_LINEARPOSITIONCNTR_LOW); 246 byte_count = (byte_count << 32) | low; 247 return byte_count; 248 } 249 acp63_pdm_dma_pointer(struct snd_soc_component * comp,struct snd_pcm_substream * stream)250 static snd_pcm_uframes_t acp63_pdm_dma_pointer(struct snd_soc_component *comp, 251 struct snd_pcm_substream *stream) 252 { 253 struct pdm_stream_instance *rtd; 254 u32 pos, buffersize; 255 u64 bytescount; 256 257 rtd = stream->runtime->private_data; 258 buffersize = frames_to_bytes(stream->runtime, 259 stream->runtime->buffer_size); 260 bytescount = acp63_pdm_get_byte_count(rtd, stream->stream); 261 if (bytescount > rtd->bytescount) 262 bytescount -= rtd->bytescount; 263 pos = do_div(bytescount, buffersize); 264 return bytes_to_frames(stream->runtime, pos); 265 } 266 acp63_pdm_dma_new(struct snd_soc_component * component,struct snd_soc_pcm_runtime * rtd)267 static int acp63_pdm_dma_new(struct snd_soc_component *component, 268 struct snd_soc_pcm_runtime *rtd) 269 { 270 struct device *parent = component->dev->parent; 271 272 snd_pcm_set_managed_buffer_all(rtd->pcm, SNDRV_DMA_TYPE_DEV, 273 parent, MIN_BUFFER, MAX_BUFFER); 274 return 0; 275 } 276 acp63_pdm_dma_close(struct snd_soc_component * component,struct snd_pcm_substream * substream)277 static int acp63_pdm_dma_close(struct snd_soc_component *component, 278 struct snd_pcm_substream *substream) 279 { 280 struct pdm_dev_data *adata = dev_get_drvdata(component->dev); 281 struct snd_pcm_runtime *runtime = substream->runtime; 282 283 acp63_disable_pdm_interrupts(adata); 284 adata->capture_stream = NULL; 285 kfree(runtime->private_data); 286 return 0; 287 } 288 acp63_pdm_dai_trigger(struct snd_pcm_substream * substream,int cmd,struct snd_soc_dai * dai)289 static int acp63_pdm_dai_trigger(struct snd_pcm_substream *substream, 290 int cmd, struct snd_soc_dai *dai) 291 { 292 struct pdm_stream_instance *rtd; 293 int ret; 294 bool pdm_status; 295 unsigned int ch_mask; 296 297 rtd = substream->runtime->private_data; 298 ret = 0; 299 switch (substream->runtime->channels) { 300 case TWO_CH: 301 ch_mask = 0x00; 302 break; 303 default: 304 return -EINVAL; 305 } 306 switch (cmd) { 307 case SNDRV_PCM_TRIGGER_START: 308 case SNDRV_PCM_TRIGGER_RESUME: 309 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 310 writel(ch_mask, rtd->acp63_base + ACP_WOV_PDM_NO_OF_CHANNELS); 311 writel(PDM_DECIMATION_FACTOR, rtd->acp63_base + ACP_WOV_PDM_DECIMATION_FACTOR); 312 rtd->bytescount = acp63_pdm_get_byte_count(rtd, substream->stream); 313 pdm_status = acp63_check_pdm_dma_status(rtd->acp63_base); 314 if (!pdm_status) 315 ret = acp63_start_pdm_dma(rtd->acp63_base); 316 break; 317 case SNDRV_PCM_TRIGGER_STOP: 318 case SNDRV_PCM_TRIGGER_SUSPEND: 319 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 320 pdm_status = acp63_check_pdm_dma_status(rtd->acp63_base); 321 if (pdm_status) 322 ret = acp63_stop_pdm_dma(rtd->acp63_base); 323 break; 324 default: 325 ret = -EINVAL; 326 break; 327 } 328 return ret; 329 } 330 331 static const struct snd_soc_dai_ops acp63_pdm_dai_ops = { 332 .trigger = acp63_pdm_dai_trigger, 333 }; 334 335 static struct snd_soc_dai_driver acp63_pdm_dai_driver = { 336 .name = "acp_ps_pdm_dma.0", 337 .capture = { 338 .rates = SNDRV_PCM_RATE_48000, 339 .formats = SNDRV_PCM_FMTBIT_S32_LE, 340 .channels_min = 2, 341 .channels_max = 2, 342 .rate_min = 48000, 343 .rate_max = 48000, 344 }, 345 .ops = &acp63_pdm_dai_ops, 346 }; 347 348 static const struct snd_soc_component_driver acp63_pdm_component = { 349 .name = DRV_NAME, 350 .open = acp63_pdm_dma_open, 351 .close = acp63_pdm_dma_close, 352 .hw_params = acp63_pdm_dma_hw_params, 353 .pointer = acp63_pdm_dma_pointer, 354 .pcm_construct = acp63_pdm_dma_new, 355 }; 356 acp63_pdm_audio_probe(struct platform_device * pdev)357 static int acp63_pdm_audio_probe(struct platform_device *pdev) 358 { 359 struct resource *res; 360 struct pdm_dev_data *adata; 361 struct acp63_dev_data *acp_data; 362 struct device *parent; 363 int status; 364 365 parent = pdev->dev.parent; 366 acp_data = dev_get_drvdata(parent); 367 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 368 if (!res) { 369 dev_err(&pdev->dev, "IORESOURCE_MEM FAILED\n"); 370 return -ENODEV; 371 } 372 373 adata = devm_kzalloc(&pdev->dev, sizeof(*adata), GFP_KERNEL); 374 if (!adata) 375 return -ENOMEM; 376 377 adata->acp63_base = devm_ioremap(&pdev->dev, res->start, resource_size(res)); 378 if (!adata->acp63_base) 379 return -ENOMEM; 380 381 adata->capture_stream = NULL; 382 adata->acp_lock = &acp_data->acp_lock; 383 dev_set_drvdata(&pdev->dev, adata); 384 status = devm_snd_soc_register_component(&pdev->dev, 385 &acp63_pdm_component, 386 &acp63_pdm_dai_driver, 1); 387 if (status) { 388 dev_err(&pdev->dev, "Fail to register acp pdm dai\n"); 389 390 return -ENODEV; 391 } 392 pm_runtime_set_autosuspend_delay(&pdev->dev, ACP_SUSPEND_DELAY_MS); 393 pm_runtime_use_autosuspend(&pdev->dev); 394 pm_runtime_mark_last_busy(&pdev->dev); 395 pm_runtime_set_active(&pdev->dev); 396 pm_runtime_enable(&pdev->dev); 397 return 0; 398 } 399 acp63_pdm_audio_remove(struct platform_device * pdev)400 static void acp63_pdm_audio_remove(struct platform_device *pdev) 401 { 402 pm_runtime_disable(&pdev->dev); 403 } 404 acp63_pdm_resume(struct device * dev)405 static int __maybe_unused acp63_pdm_resume(struct device *dev) 406 { 407 struct pdm_dev_data *adata; 408 struct snd_pcm_runtime *runtime; 409 struct pdm_stream_instance *rtd; 410 u32 period_bytes, buffer_len; 411 412 adata = dev_get_drvdata(dev); 413 if (adata->capture_stream && adata->capture_stream->runtime) { 414 runtime = adata->capture_stream->runtime; 415 rtd = runtime->private_data; 416 period_bytes = frames_to_bytes(runtime, runtime->period_size); 417 buffer_len = frames_to_bytes(runtime, runtime->buffer_size); 418 acp63_config_dma(rtd, SNDRV_PCM_STREAM_CAPTURE); 419 acp63_init_pdm_ring_buffer(PDM_MEM_WINDOW_START, buffer_len, 420 period_bytes, adata->acp63_base); 421 } 422 acp63_enable_pdm_interrupts(adata); 423 return 0; 424 } 425 acp63_pdm_suspend(struct device * dev)426 static int __maybe_unused acp63_pdm_suspend(struct device *dev) 427 { 428 struct pdm_dev_data *adata; 429 430 adata = dev_get_drvdata(dev); 431 acp63_disable_pdm_interrupts(adata); 432 return 0; 433 } 434 acp63_pdm_runtime_resume(struct device * dev)435 static int __maybe_unused acp63_pdm_runtime_resume(struct device *dev) 436 { 437 struct pdm_dev_data *adata; 438 439 adata = dev_get_drvdata(dev); 440 acp63_enable_pdm_interrupts(adata); 441 return 0; 442 } 443 444 static const struct dev_pm_ops acp63_pdm_pm_ops = { 445 SET_RUNTIME_PM_OPS(acp63_pdm_suspend, acp63_pdm_runtime_resume, NULL) 446 SET_SYSTEM_SLEEP_PM_OPS(acp63_pdm_suspend, acp63_pdm_resume) 447 }; 448 449 static struct platform_driver acp63_pdm_dma_driver = { 450 .probe = acp63_pdm_audio_probe, 451 .remove_new = acp63_pdm_audio_remove, 452 .driver = { 453 .name = "acp_ps_pdm_dma", 454 .pm = &acp63_pdm_pm_ops, 455 }, 456 }; 457 458 module_platform_driver(acp63_pdm_dma_driver); 459 460 MODULE_AUTHOR("Syed.SabaKareem@amd.com"); 461 MODULE_DESCRIPTION("AMD PINK SARDINE PDM Driver"); 462 MODULE_LICENSE("GPL v2"); 463 MODULE_ALIAS("platform:" DRV_NAME); 464