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1// SPDX-License-Identifier: GPL-2.0+2//3// AMD ALSA SoC PDM Driver4//5//Copyright 2020 Advanced Micro Devices, Inc.6 7#include <linux/platform_device.h>8#include <linux/module.h>9#include <linux/bitfield.h>10#include <linux/err.h>11#include <linux/io.h>12#include <linux/pm_runtime.h>13#include <sound/pcm_params.h>14#include <sound/soc.h>15#include <sound/soc-dai.h>16 17#include "rn_acp3x.h"18 19#define DRV_NAME "acp_rn_pdm_dma"20 21static int pdm_gain = 3;22module_param(pdm_gain, int, 0644);23MODULE_PARM_DESC(pdm_gain, "Gain control (0-3)");24 25static const struct snd_pcm_hardware acp_pdm_hardware_capture = {26 .info = SNDRV_PCM_INFO_INTERLEAVED |27 SNDRV_PCM_INFO_BLOCK_TRANSFER |28 SNDRV_PCM_INFO_MMAP |29 SNDRV_PCM_INFO_MMAP_VALID |30 SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME,31 .formats = SNDRV_PCM_FMTBIT_S32_LE,32 .channels_min = 2,33 .channels_max = 2,34 .rates = SNDRV_PCM_RATE_48000,35 .rate_min = 48000,36 .rate_max = 48000,37 .buffer_bytes_max = CAPTURE_MAX_NUM_PERIODS * CAPTURE_MAX_PERIOD_SIZE,38 .period_bytes_min = CAPTURE_MIN_PERIOD_SIZE,39 .period_bytes_max = CAPTURE_MAX_PERIOD_SIZE,40 .periods_min = CAPTURE_MIN_NUM_PERIODS,41 .periods_max = CAPTURE_MAX_NUM_PERIODS,42};43 44static irqreturn_t pdm_irq_handler(int irq, void *dev_id)45{46 struct pdm_dev_data *rn_pdm_data;47 u16 cap_flag;48 u32 val;49 50 rn_pdm_data = dev_id;51 if (!rn_pdm_data)52 return IRQ_NONE;53 54 cap_flag = 0;55 val = rn_readl(rn_pdm_data->acp_base + ACP_EXTERNAL_INTR_STAT);56 if ((val & BIT(PDM_DMA_STAT)) && rn_pdm_data->capture_stream) {57 rn_writel(BIT(PDM_DMA_STAT), rn_pdm_data->acp_base +58 ACP_EXTERNAL_INTR_STAT);59 snd_pcm_period_elapsed(rn_pdm_data->capture_stream);60 cap_flag = 1;61 }62 63 if (cap_flag)64 return IRQ_HANDLED;65 else66 return IRQ_NONE;67}68 69static void init_pdm_ring_buffer(u32 physical_addr,70 u32 buffer_size,71 u32 watermark_size,72 void __iomem *acp_base)73{74 rn_writel(physical_addr, acp_base + ACP_WOV_RX_RINGBUFADDR);75 rn_writel(buffer_size, acp_base + ACP_WOV_RX_RINGBUFSIZE);76 rn_writel(watermark_size, acp_base + ACP_WOV_RX_INTR_WATERMARK_SIZE);77 rn_writel(0x01, acp_base + ACPAXI2AXI_ATU_CTRL);78}79 80static void enable_pdm_clock(void __iomem *acp_base)81{82 u32 pdm_clk_enable, pdm_ctrl;83 84 pdm_clk_enable = ACP_PDM_CLK_FREQ_MASK;85 86 rn_writel(pdm_clk_enable, acp_base + ACP_WOV_CLK_CTRL);87 pdm_ctrl = rn_readl(acp_base + ACP_WOV_MISC_CTRL);88 pdm_ctrl &= ~ACP_WOV_GAIN_CONTROL;89 pdm_ctrl |= FIELD_PREP(ACP_WOV_GAIN_CONTROL, clamp(pdm_gain, 0, 3));90 rn_writel(pdm_ctrl, acp_base + ACP_WOV_MISC_CTRL);91}92 93static void enable_pdm_interrupts(void __iomem *acp_base)94{95 u32 ext_int_ctrl;96 97 ext_int_ctrl = rn_readl(acp_base + ACP_EXTERNAL_INTR_CNTL);98 ext_int_ctrl |= PDM_DMA_INTR_MASK;99 rn_writel(ext_int_ctrl, acp_base + ACP_EXTERNAL_INTR_CNTL);100}101 102static void disable_pdm_interrupts(void __iomem *acp_base)103{104 u32 ext_int_ctrl;105 106 ext_int_ctrl = rn_readl(acp_base + ACP_EXTERNAL_INTR_CNTL);107 ext_int_ctrl |= ~PDM_DMA_INTR_MASK;108 rn_writel(ext_int_ctrl, acp_base + ACP_EXTERNAL_INTR_CNTL);109}110 111static bool check_pdm_dma_status(void __iomem *acp_base)112{113 bool pdm_dma_status;114 u32 pdm_enable, pdm_dma_enable;115 116 pdm_dma_status = false;117 pdm_enable = rn_readl(acp_base + ACP_WOV_PDM_ENABLE);118 pdm_dma_enable = rn_readl(acp_base + ACP_WOV_PDM_DMA_ENABLE);119 if ((pdm_enable & ACP_PDM_ENABLE) && (pdm_dma_enable &120 ACP_PDM_DMA_EN_STATUS))121 pdm_dma_status = true;122 return pdm_dma_status;123}124 125static int start_pdm_dma(void __iomem *acp_base)126{127 u32 pdm_enable;128 u32 pdm_dma_enable;129 int timeout;130 131 pdm_enable = 0x01;132 pdm_dma_enable = 0x01;133 134 enable_pdm_clock(acp_base);135 rn_writel(pdm_enable, acp_base + ACP_WOV_PDM_ENABLE);136 rn_writel(pdm_dma_enable, acp_base + ACP_WOV_PDM_DMA_ENABLE);137 timeout = 0;138 while (++timeout < ACP_COUNTER) {139 pdm_dma_enable = rn_readl(acp_base + ACP_WOV_PDM_DMA_ENABLE);140 if ((pdm_dma_enable & 0x02) == ACP_PDM_DMA_EN_STATUS)141 return 0;142 udelay(DELAY_US);143 }144 return -ETIMEDOUT;145}146 147static int stop_pdm_dma(void __iomem *acp_base)148{149 u32 pdm_enable, pdm_dma_enable;150 int timeout;151 152 pdm_enable = rn_readl(acp_base + ACP_WOV_PDM_ENABLE);153 pdm_dma_enable = rn_readl(acp_base + ACP_WOV_PDM_DMA_ENABLE);154 if (pdm_dma_enable & 0x01) {155 pdm_dma_enable = 0x02;156 rn_writel(pdm_dma_enable, acp_base + ACP_WOV_PDM_DMA_ENABLE);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_close(struct snd_soc_component *component,301 struct snd_pcm_substream *substream)302{303 struct pdm_dev_data *adata = dev_get_drvdata(component->dev);304 305 disable_pdm_interrupts(adata->acp_base);306 adata->capture_stream = NULL;307 return 0;308}309 310static int acp_pdm_dai_trigger(struct snd_pcm_substream *substream,311 int cmd, struct snd_soc_dai *dai)312{313 struct pdm_stream_instance *rtd;314 int ret;315 bool pdm_status;316 unsigned int ch_mask;317 318 rtd = substream->runtime->private_data;319 ret = 0;320 switch (substream->runtime->channels) {321 case TWO_CH:322 ch_mask = 0x00;323 break;324 default:325 return -EINVAL;326 }327 switch (cmd) {328 case SNDRV_PCM_TRIGGER_START:329 case SNDRV_PCM_TRIGGER_RESUME:330 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:331 rn_writel(ch_mask, rtd->acp_base + ACP_WOV_PDM_NO_OF_CHANNELS);332 rn_writel(PDM_DECIMATION_FACTOR, rtd->acp_base +333 ACP_WOV_PDM_DECIMATION_FACTOR);334 rtd->bytescount = acp_pdm_get_byte_count(rtd,335 substream->stream);336 pdm_status = check_pdm_dma_status(rtd->acp_base);337 if (!pdm_status)338 ret = start_pdm_dma(rtd->acp_base);339 break;340 case SNDRV_PCM_TRIGGER_STOP:341 case SNDRV_PCM_TRIGGER_SUSPEND:342 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:343 pdm_status = check_pdm_dma_status(rtd->acp_base);344 if (pdm_status)345 ret = stop_pdm_dma(rtd->acp_base);346 break;347 default:348 ret = -EINVAL;349 break;350 }351 return ret;352}353 354static const struct snd_soc_dai_ops acp_pdm_dai_ops = {355 .trigger = acp_pdm_dai_trigger,356};357 358static struct snd_soc_dai_driver acp_pdm_dai_driver = {359 .capture = {360 .rates = SNDRV_PCM_RATE_48000,361 .formats = SNDRV_PCM_FMTBIT_S24_LE |362 SNDRV_PCM_FMTBIT_S32_LE,363 .channels_min = 2,364 .channels_max = 2,365 .rate_min = 48000,366 .rate_max = 48000,367 },368 .ops = &acp_pdm_dai_ops,369};370 371static const struct snd_soc_component_driver acp_pdm_component = {372 .name = DRV_NAME,373 .open = acp_pdm_dma_open,374 .close = acp_pdm_dma_close,375 .hw_params = acp_pdm_dma_hw_params,376 .pointer = acp_pdm_dma_pointer,377 .pcm_construct = acp_pdm_dma_new,378 .legacy_dai_naming = 1,379};380 381static int acp_pdm_audio_probe(struct platform_device *pdev)382{383 struct resource *res;384 struct pdm_dev_data *adata;385 unsigned int irqflags;386 int status;387 388 if (!pdev->dev.platform_data) {389 dev_err(&pdev->dev, "platform_data not retrieved\n");390 return -ENODEV;391 }392 irqflags = *((unsigned int *)(pdev->dev.platform_data));393 394 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);395 if (!res) {396 dev_err(&pdev->dev, "IORESOURCE_MEM FAILED\n");397 return -ENODEV;398 }399 400 adata = devm_kzalloc(&pdev->dev, sizeof(*adata), GFP_KERNEL);401 if (!adata)402 return -ENOMEM;403 404 adata->acp_base = devm_ioremap(&pdev->dev, res->start,405 resource_size(res));406 if (!adata->acp_base)407 return -ENOMEM;408 409 status = platform_get_irq(pdev, 0);410 if (status < 0)411 return status;412 adata->pdm_irq = status;413 414 adata->capture_stream = NULL;415 416 dev_set_drvdata(&pdev->dev, adata);417 status = devm_snd_soc_register_component(&pdev->dev,418 &acp_pdm_component,419 &acp_pdm_dai_driver, 1);420 if (status) {421 dev_err(&pdev->dev, "Fail to register acp pdm dai\n");422 423 return -ENODEV;424 }425 status = devm_request_irq(&pdev->dev, adata->pdm_irq, pdm_irq_handler,426 irqflags, "ACP_PDM_IRQ", adata);427 if (status) {428 dev_err(&pdev->dev, "ACP PDM IRQ request failed\n");429 return -ENODEV;430 }431 pm_runtime_set_autosuspend_delay(&pdev->dev, ACP_SUSPEND_DELAY_MS);432 pm_runtime_use_autosuspend(&pdev->dev);433 pm_runtime_mark_last_busy(&pdev->dev);434 pm_runtime_set_active(&pdev->dev);435 pm_runtime_enable(&pdev->dev);436 return 0;437}438 439static void acp_pdm_audio_remove(struct platform_device *pdev)440{441 pm_runtime_disable(&pdev->dev);442}443 444static int acp_pdm_resume(struct device *dev)445{446 struct pdm_dev_data *adata;447 struct snd_pcm_runtime *runtime;448 struct pdm_stream_instance *rtd;449 u32 period_bytes, buffer_len;450 451 adata = dev_get_drvdata(dev);452 if (adata->capture_stream && adata->capture_stream->runtime) {453 runtime = adata->capture_stream->runtime;454 rtd = runtime->private_data;455 period_bytes = frames_to_bytes(runtime, runtime->period_size);456 buffer_len = frames_to_bytes(runtime, runtime->buffer_size);457 config_acp_dma(rtd, SNDRV_PCM_STREAM_CAPTURE);458 init_pdm_ring_buffer(MEM_WINDOW_START, buffer_len, period_bytes,459 adata->acp_base);460 }461 enable_pdm_interrupts(adata->acp_base);462 return 0;463}464 465static int acp_pdm_runtime_suspend(struct device *dev)466{467 struct pdm_dev_data *adata;468 469 adata = dev_get_drvdata(dev);470 disable_pdm_interrupts(adata->acp_base);471 472 return 0;473}474 475static int acp_pdm_runtime_resume(struct device *dev)476{477 struct pdm_dev_data *adata;478 479 adata = dev_get_drvdata(dev);480 enable_pdm_interrupts(adata->acp_base);481 return 0;482}483 484static const struct dev_pm_ops acp_pdm_pm_ops = {485 .runtime_suspend = acp_pdm_runtime_suspend,486 .runtime_resume = acp_pdm_runtime_resume,487 .resume = acp_pdm_resume,488};489 490static struct platform_driver acp_pdm_dma_driver = {491 .probe = acp_pdm_audio_probe,492 .remove = acp_pdm_audio_remove,493 .driver = {494 .name = "acp_rn_pdm_dma",495 .pm = &acp_pdm_pm_ops,496 },497};498 499module_platform_driver(acp_pdm_dma_driver);500 501MODULE_AUTHOR("Vijendar.Mukunda@amd.com");502MODULE_DESCRIPTION("AMD ACP3x Renior PDM Driver");503MODULE_LICENSE("GPL v2");504MODULE_ALIAS("platform:" DRV_NAME);505