| 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); |