1 // SPDX-License-Identifier: GPL-2.0+
3 // AMD ALSA SoC PDM Driver
5 //Copyright 2020 Advanced Micro Devices, Inc.
7 #include <linux/platform_device.h>
8 #include <linux/module.h>
11 #include <linux/pm_runtime.h>
12 #include <sound/pcm_params.h>
13 #include <sound/soc.h>
14 #include <sound/soc-dai.h>
18 #define DRV_NAME "acp_rn_pdm_dma"
20 static const struct snd_pcm_hardware acp_pdm_hardware_capture = {
21 .info = SNDRV_PCM_INFO_INTERLEAVED |
22 SNDRV_PCM_INFO_BLOCK_TRANSFER |
24 SNDRV_PCM_INFO_MMAP_VALID |
25 SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME,
26 .formats = SNDRV_PCM_FMTBIT_S32_LE,
29 .rates = SNDRV_PCM_RATE_48000,
32 .buffer_bytes_max = CAPTURE_MAX_NUM_PERIODS * CAPTURE_MAX_PERIOD_SIZE,
33 .period_bytes_min = CAPTURE_MIN_PERIOD_SIZE,
34 .period_bytes_max = CAPTURE_MAX_PERIOD_SIZE,
35 .periods_min = CAPTURE_MIN_NUM_PERIODS,
36 .periods_max = CAPTURE_MAX_NUM_PERIODS,
39 static irqreturn_t pdm_irq_handler(int irq, void *dev_id)
41 struct pdm_dev_data *rn_pdm_data;
50 val = rn_readl(rn_pdm_data->acp_base + ACP_EXTERNAL_INTR_STAT);
51 if ((val & BIT(PDM_DMA_STAT)) && rn_pdm_data->capture_stream) {
52 rn_writel(BIT(PDM_DMA_STAT), rn_pdm_data->acp_base +
53 ACP_EXTERNAL_INTR_STAT);
54 snd_pcm_period_elapsed(rn_pdm_data->capture_stream);
64 static void init_pdm_ring_buffer(u32 physical_addr,
67 void __iomem *acp_base)
69 rn_writel(physical_addr, acp_base + ACP_WOV_RX_RINGBUFADDR);
70 rn_writel(buffer_size, acp_base + ACP_WOV_RX_RINGBUFSIZE);
71 rn_writel(watermark_size, acp_base + ACP_WOV_RX_INTR_WATERMARK_SIZE);
72 rn_writel(0x01, acp_base + ACPAXI2AXI_ATU_CTRL);
75 static void enable_pdm_clock(void __iomem *acp_base)
77 u32 pdm_clk_enable, pdm_ctrl;
79 pdm_clk_enable = ACP_PDM_CLK_FREQ_MASK;
82 rn_writel(pdm_clk_enable, acp_base + ACP_WOV_CLK_CTRL);
83 pdm_ctrl = rn_readl(acp_base + ACP_WOV_MISC_CTRL);
84 pdm_ctrl |= ACP_WOV_MISC_CTRL_MASK;
85 rn_writel(pdm_ctrl, acp_base + ACP_WOV_MISC_CTRL);
88 static void enable_pdm_interrupts(void __iomem *acp_base)
92 ext_int_ctrl = rn_readl(acp_base + ACP_EXTERNAL_INTR_CNTL);
93 ext_int_ctrl |= PDM_DMA_INTR_MASK;
94 rn_writel(ext_int_ctrl, acp_base + ACP_EXTERNAL_INTR_CNTL);
97 static void disable_pdm_interrupts(void __iomem *acp_base)
101 ext_int_ctrl = rn_readl(acp_base + ACP_EXTERNAL_INTR_CNTL);
102 ext_int_ctrl |= ~PDM_DMA_INTR_MASK;
103 rn_writel(ext_int_ctrl, acp_base + ACP_EXTERNAL_INTR_CNTL);
106 static bool check_pdm_dma_status(void __iomem *acp_base)
109 u32 pdm_enable, pdm_dma_enable;
111 pdm_dma_status = false;
112 pdm_enable = rn_readl(acp_base + ACP_WOV_PDM_ENABLE);
113 pdm_dma_enable = rn_readl(acp_base + ACP_WOV_PDM_DMA_ENABLE);
114 if ((pdm_enable & ACP_PDM_ENABLE) && (pdm_dma_enable &
115 ACP_PDM_DMA_EN_STATUS))
116 pdm_dma_status = true;
117 return pdm_dma_status;
120 static int start_pdm_dma(void __iomem *acp_base)
127 pdm_dma_enable = 0x01;
129 enable_pdm_clock(acp_base);
130 rn_writel(pdm_enable, acp_base + ACP_WOV_PDM_ENABLE);
131 rn_writel(pdm_dma_enable, acp_base + ACP_WOV_PDM_DMA_ENABLE);
132 pdm_dma_enable = 0x00;
134 while (++timeout < ACP_COUNTER) {
135 pdm_dma_enable = rn_readl(acp_base + ACP_WOV_PDM_DMA_ENABLE);
136 if ((pdm_dma_enable & 0x02) == ACP_PDM_DMA_EN_STATUS)
143 static int stop_pdm_dma(void __iomem *acp_base)
145 u32 pdm_enable, pdm_dma_enable;
149 pdm_dma_enable = 0x00;
151 pdm_enable = rn_readl(acp_base + ACP_WOV_PDM_ENABLE);
152 pdm_dma_enable = rn_readl(acp_base + ACP_WOV_PDM_DMA_ENABLE);
153 if (pdm_dma_enable & 0x01) {
154 pdm_dma_enable = 0x02;
155 rn_writel(pdm_dma_enable, acp_base + ACP_WOV_PDM_DMA_ENABLE);
156 pdm_dma_enable = 0x00;
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)
165 if (timeout == ACP_COUNTER)
168 if (pdm_enable == ACP_PDM_ENABLE) {
169 pdm_enable = ACP_PDM_DISABLE;
170 rn_writel(pdm_enable, acp_base + ACP_WOV_PDM_ENABLE);
172 rn_writel(0x01, acp_base + ACP_WOV_PDM_FIFO_FLUSH);
176 static void config_acp_dma(struct pdm_stream_instance *rtd, int direction)
182 addr = rtd->dma_addr;
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);
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);
196 rn_writel(low, rtd->acp_base + ACP_SCRATCH_REG_0 + val);
198 rn_writel(high, rtd->acp_base + ACP_SCRATCH_REG_0 + val + 4);
204 static int acp_pdm_dma_open(struct snd_soc_component *component,
205 struct snd_pcm_substream *substream)
207 struct snd_pcm_runtime *runtime;
208 struct pdm_dev_data *adata;
209 struct pdm_stream_instance *pdm_data;
212 runtime = substream->runtime;
213 adata = dev_get_drvdata(component->dev);
214 pdm_data = kzalloc(sizeof(*pdm_data), GFP_KERNEL);
218 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
219 runtime->hw = acp_pdm_hardware_capture;
221 ret = snd_pcm_hw_constraint_integer(runtime,
222 SNDRV_PCM_HW_PARAM_PERIODS);
224 dev_err(component->dev, "set integer constraint failed\n");
229 enable_pdm_interrupts(adata->acp_base);
231 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
232 adata->capture_stream = substream;
234 pdm_data->acp_base = adata->acp_base;
235 runtime->private_data = pdm_data;
239 static int acp_pdm_dma_hw_params(struct snd_soc_component *component,
240 struct snd_pcm_substream *substream,
241 struct snd_pcm_hw_params *params)
243 struct pdm_stream_instance *rtd;
244 size_t size, period_bytes;
246 rtd = substream->runtime->private_data;
249 size = params_buffer_bytes(params);
250 period_bytes = params_period_bytes(params);
251 rtd->dma_addr = substream->dma_buffer.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,
259 static u64 acp_pdm_get_byte_count(struct pdm_stream_instance *rtd,
262 union acp_pdm_dma_count byte_count;
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;
273 static snd_pcm_uframes_t acp_pdm_dma_pointer(struct snd_soc_component *comp,
274 struct snd_pcm_substream *stream)
276 struct pdm_stream_instance *rtd;
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);
290 static int acp_pdm_dma_new(struct snd_soc_component *component,
291 struct snd_soc_pcm_runtime *rtd)
293 struct device *parent = component->dev->parent;
295 snd_pcm_set_managed_buffer_all(rtd->pcm, SNDRV_DMA_TYPE_DEV,
296 parent, MIN_BUFFER, MAX_BUFFER);
300 static int acp_pdm_dma_mmap(struct snd_soc_component *component,
301 struct snd_pcm_substream *substream,
302 struct vm_area_struct *vma)
304 return snd_pcm_lib_default_mmap(substream, vma);
307 static int acp_pdm_dma_close(struct snd_soc_component *component,
308 struct snd_pcm_substream *substream)
310 struct pdm_dev_data *adata = dev_get_drvdata(component->dev);
312 disable_pdm_interrupts(adata->acp_base);
313 adata->capture_stream = NULL;
317 static int acp_pdm_dai_trigger(struct snd_pcm_substream *substream,
318 int cmd, struct snd_soc_dai *dai)
320 struct pdm_stream_instance *rtd;
323 unsigned int ch_mask;
325 rtd = substream->runtime->private_data;
327 switch (substream->runtime->channels) {
335 case SNDRV_PCM_TRIGGER_START:
336 case SNDRV_PCM_TRIGGER_RESUME:
337 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
338 rn_writel(ch_mask, rtd->acp_base + ACP_WOV_PDM_NO_OF_CHANNELS);
339 rn_writel(PDM_DECIMATION_FACTOR, rtd->acp_base +
340 ACP_WOV_PDM_DECIMATION_FACTOR);
341 rtd->bytescount = acp_pdm_get_byte_count(rtd,
343 pdm_status = check_pdm_dma_status(rtd->acp_base);
345 ret = start_pdm_dma(rtd->acp_base);
347 case SNDRV_PCM_TRIGGER_STOP:
348 case SNDRV_PCM_TRIGGER_SUSPEND:
349 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
350 pdm_status = check_pdm_dma_status(rtd->acp_base);
352 ret = stop_pdm_dma(rtd->acp_base);
361 static struct snd_soc_dai_ops acp_pdm_dai_ops = {
362 .trigger = acp_pdm_dai_trigger,
365 static struct snd_soc_dai_driver acp_pdm_dai_driver = {
367 .rates = SNDRV_PCM_RATE_48000,
368 .formats = SNDRV_PCM_FMTBIT_S24_LE |
369 SNDRV_PCM_FMTBIT_S32_LE,
375 .ops = &acp_pdm_dai_ops,
378 static const struct snd_soc_component_driver acp_pdm_component = {
380 .open = acp_pdm_dma_open,
381 .close = acp_pdm_dma_close,
382 .hw_params = acp_pdm_dma_hw_params,
383 .pointer = acp_pdm_dma_pointer,
384 .mmap = acp_pdm_dma_mmap,
385 .pcm_construct = acp_pdm_dma_new,
388 static int acp_pdm_audio_probe(struct platform_device *pdev)
390 struct resource *res;
391 struct pdm_dev_data *adata;
392 unsigned int irqflags;
395 if (!pdev->dev.platform_data) {
396 dev_err(&pdev->dev, "platform_data not retrieved\n");
399 irqflags = *((unsigned int *)(pdev->dev.platform_data));
401 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
403 dev_err(&pdev->dev, "IORESOURCE_MEM FAILED\n");
407 adata = devm_kzalloc(&pdev->dev, sizeof(*adata), GFP_KERNEL);
411 adata->acp_base = devm_ioremap(&pdev->dev, res->start,
413 if (!adata->acp_base)
416 res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
418 dev_err(&pdev->dev, "IORESOURCE_IRQ FAILED\n");
422 adata->pdm_irq = res->start;
423 adata->capture_stream = NULL;
425 dev_set_drvdata(&pdev->dev, adata);
426 status = devm_snd_soc_register_component(&pdev->dev,
428 &acp_pdm_dai_driver, 1);
430 dev_err(&pdev->dev, "Fail to register acp pdm dai\n");
434 status = devm_request_irq(&pdev->dev, adata->pdm_irq, pdm_irq_handler,
435 irqflags, "ACP_PDM_IRQ", adata);
437 dev_err(&pdev->dev, "ACP PDM IRQ request failed\n");
440 pm_runtime_set_autosuspend_delay(&pdev->dev, ACP_SUSPEND_DELAY_MS);
441 pm_runtime_use_autosuspend(&pdev->dev);
442 pm_runtime_enable(&pdev->dev);
443 pm_runtime_allow(&pdev->dev);
447 static int acp_pdm_audio_remove(struct platform_device *pdev)
449 pm_runtime_disable(&pdev->dev);
453 static int acp_pdm_resume(struct device *dev)
455 struct pdm_dev_data *adata;
456 struct snd_pcm_runtime *runtime;
457 struct pdm_stream_instance *rtd;
458 u32 period_bytes, buffer_len;
460 adata = dev_get_drvdata(dev);
461 if (adata->capture_stream && adata->capture_stream->runtime) {
462 runtime = adata->capture_stream->runtime;
463 rtd = runtime->private_data;
464 period_bytes = frames_to_bytes(runtime, runtime->period_size);
465 buffer_len = frames_to_bytes(runtime, runtime->buffer_size);
466 config_acp_dma(rtd, SNDRV_PCM_STREAM_CAPTURE);
467 init_pdm_ring_buffer(MEM_WINDOW_START, buffer_len, period_bytes,
470 enable_pdm_interrupts(adata->acp_base);
474 static int acp_pdm_runtime_suspend(struct device *dev)
476 struct pdm_dev_data *adata;
478 adata = dev_get_drvdata(dev);
479 disable_pdm_interrupts(adata->acp_base);
484 static int acp_pdm_runtime_resume(struct device *dev)
486 struct pdm_dev_data *adata;
488 adata = dev_get_drvdata(dev);
489 enable_pdm_interrupts(adata->acp_base);
493 static const struct dev_pm_ops acp_pdm_pm_ops = {
494 .runtime_suspend = acp_pdm_runtime_suspend,
495 .runtime_resume = acp_pdm_runtime_resume,
496 .resume = acp_pdm_resume,
499 static struct platform_driver acp_pdm_dma_driver = {
500 .probe = acp_pdm_audio_probe,
501 .remove = acp_pdm_audio_remove,
503 .name = "acp_rn_pdm_dma",
504 .pm = &acp_pdm_pm_ops,
508 module_platform_driver(acp_pdm_dma_driver);
510 MODULE_AUTHOR("Vijendar.Mukunda@amd.com");
511 MODULE_DESCRIPTION("AMD ACP3x Renior PDM Driver");
512 MODULE_LICENSE("GPL v2");
513 MODULE_ALIAS("platform:" DRV_NAME);