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/err.h>
11 #include <linux/io.h>
12 #include <sound/pcm_params.h>
13 #include <sound/soc.h>
14 #include <sound/soc-dai.h>
15 #include <linux/pm_runtime.h>
16
17 #include "acp6x.h"
18
19 #define DRV_NAME "acp_yc_pdm_dma"
20
21 static const struct snd_pcm_hardware acp6x_pdm_hardware_capture = {
22 .info = SNDRV_PCM_INFO_INTERLEAVED |
23 SNDRV_PCM_INFO_BLOCK_TRANSFER |
24 SNDRV_PCM_INFO_MMAP |
25 SNDRV_PCM_INFO_MMAP_VALID |
26 SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME,
27 .formats = SNDRV_PCM_FMTBIT_S32_LE,
28 .channels_min = 2,
29 .channels_max = 2,
30 .rates = SNDRV_PCM_RATE_48000,
31 .rate_min = 48000,
32 .rate_max = 48000,
33 .buffer_bytes_max = CAPTURE_MAX_NUM_PERIODS * CAPTURE_MAX_PERIOD_SIZE,
34 .period_bytes_min = CAPTURE_MIN_PERIOD_SIZE,
35 .period_bytes_max = CAPTURE_MAX_PERIOD_SIZE,
36 .periods_min = CAPTURE_MIN_NUM_PERIODS,
37 .periods_max = CAPTURE_MAX_NUM_PERIODS,
38 };
39
acp6x_init_pdm_ring_buffer(u32 physical_addr,u32 buffer_size,u32 watermark_size,void __iomem * acp_base)40 static void acp6x_init_pdm_ring_buffer(u32 physical_addr, u32 buffer_size,
41 u32 watermark_size, void __iomem *acp_base)
42 {
43 acp6x_writel(physical_addr, acp_base + ACP_WOV_RX_RINGBUFADDR);
44 acp6x_writel(buffer_size, acp_base + ACP_WOV_RX_RINGBUFSIZE);
45 acp6x_writel(watermark_size, acp_base + ACP_WOV_RX_INTR_WATERMARK_SIZE);
46 acp6x_writel(0x01, acp_base + ACPAXI2AXI_ATU_CTRL);
47 }
48
acp6x_enable_pdm_clock(void __iomem * acp_base)49 static void acp6x_enable_pdm_clock(void __iomem *acp_base)
50 {
51 u32 pdm_clk_enable, pdm_ctrl;
52
53 pdm_clk_enable = ACP_PDM_CLK_FREQ_MASK;
54 pdm_ctrl = 0x00;
55
56 acp6x_writel(pdm_clk_enable, acp_base + ACP_WOV_CLK_CTRL);
57 pdm_ctrl = acp6x_readl(acp_base + ACP_WOV_MISC_CTRL);
58 pdm_ctrl |= ACP_WOV_MISC_CTRL_MASK;
59 acp6x_writel(pdm_ctrl, acp_base + ACP_WOV_MISC_CTRL);
60 }
61
acp6x_enable_pdm_interrupts(void __iomem * acp_base)62 static void acp6x_enable_pdm_interrupts(void __iomem *acp_base)
63 {
64 u32 ext_int_ctrl;
65
66 ext_int_ctrl = acp6x_readl(acp_base + ACP_EXTERNAL_INTR_CNTL);
67 ext_int_ctrl |= PDM_DMA_INTR_MASK;
68 acp6x_writel(ext_int_ctrl, acp_base + ACP_EXTERNAL_INTR_CNTL);
69 }
70
acp6x_disable_pdm_interrupts(void __iomem * acp_base)71 static void acp6x_disable_pdm_interrupts(void __iomem *acp_base)
72 {
73 u32 ext_int_ctrl;
74
75 ext_int_ctrl = acp6x_readl(acp_base + ACP_EXTERNAL_INTR_CNTL);
76 ext_int_ctrl &= ~PDM_DMA_INTR_MASK;
77 acp6x_writel(ext_int_ctrl, acp_base + ACP_EXTERNAL_INTR_CNTL);
78 }
79
acp6x_check_pdm_dma_status(void __iomem * acp_base)80 static bool acp6x_check_pdm_dma_status(void __iomem *acp_base)
81 {
82 bool pdm_dma_status;
83 u32 pdm_enable, pdm_dma_enable;
84
85 pdm_dma_status = false;
86 pdm_enable = acp6x_readl(acp_base + ACP_WOV_PDM_ENABLE);
87 pdm_dma_enable = acp6x_readl(acp_base + ACP_WOV_PDM_DMA_ENABLE);
88 if ((pdm_enable & ACP_PDM_ENABLE) && (pdm_dma_enable & ACP_PDM_DMA_EN_STATUS))
89 pdm_dma_status = true;
90
91 return pdm_dma_status;
92 }
93
acp6x_start_pdm_dma(void __iomem * acp_base)94 static int acp6x_start_pdm_dma(void __iomem *acp_base)
95 {
96 u32 pdm_enable;
97 u32 pdm_dma_enable;
98 int timeout;
99
100 pdm_enable = 0x01;
101 pdm_dma_enable = 0x01;
102
103 acp6x_enable_pdm_clock(acp_base);
104 acp6x_writel(pdm_enable, acp_base + ACP_WOV_PDM_ENABLE);
105 acp6x_writel(pdm_dma_enable, acp_base + ACP_WOV_PDM_DMA_ENABLE);
106 timeout = 0;
107 while (++timeout < ACP_COUNTER) {
108 pdm_dma_enable = acp6x_readl(acp_base + ACP_WOV_PDM_DMA_ENABLE);
109 if ((pdm_dma_enable & 0x02) == ACP_PDM_DMA_EN_STATUS)
110 return 0;
111 udelay(DELAY_US);
112 }
113 return -ETIMEDOUT;
114 }
115
acp6x_stop_pdm_dma(void __iomem * acp_base)116 static int acp6x_stop_pdm_dma(void __iomem *acp_base)
117 {
118 u32 pdm_enable, pdm_dma_enable;
119 int timeout;
120
121 pdm_enable = 0x00;
122 pdm_dma_enable = 0x00;
123
124 pdm_enable = acp6x_readl(acp_base + ACP_WOV_PDM_ENABLE);
125 pdm_dma_enable = acp6x_readl(acp_base + ACP_WOV_PDM_DMA_ENABLE);
126 if (pdm_dma_enable & 0x01) {
127 pdm_dma_enable = 0x02;
128 acp6x_writel(pdm_dma_enable, acp_base + ACP_WOV_PDM_DMA_ENABLE);
129 timeout = 0;
130 while (++timeout < ACP_COUNTER) {
131 pdm_dma_enable = acp6x_readl(acp_base + ACP_WOV_PDM_DMA_ENABLE);
132 if ((pdm_dma_enable & 0x02) == 0x00)
133 break;
134 udelay(DELAY_US);
135 }
136 if (timeout == ACP_COUNTER)
137 return -ETIMEDOUT;
138 }
139 if (pdm_enable == ACP_PDM_ENABLE) {
140 pdm_enable = ACP_PDM_DISABLE;
141 acp6x_writel(pdm_enable, acp_base + ACP_WOV_PDM_ENABLE);
142 }
143 acp6x_writel(0x01, acp_base + ACP_WOV_PDM_FIFO_FLUSH);
144 return 0;
145 }
146
acp6x_config_dma(struct pdm_stream_instance * rtd,int direction)147 static void acp6x_config_dma(struct pdm_stream_instance *rtd, int direction)
148 {
149 u16 page_idx;
150 u32 low, high, val;
151 dma_addr_t addr;
152
153 addr = rtd->dma_addr;
154 val = PDM_PTE_OFFSET;
155
156 /* Group Enable */
157 acp6x_writel(ACP_SRAM_PTE_OFFSET | BIT(31), rtd->acp6x_base +
158 ACPAXI2AXI_ATU_BASE_ADDR_GRP_1);
159 acp6x_writel(PAGE_SIZE_4K_ENABLE, rtd->acp6x_base +
160 ACPAXI2AXI_ATU_PAGE_SIZE_GRP_1);
161 for (page_idx = 0; page_idx < rtd->num_pages; page_idx++) {
162 /* Load the low address of page int ACP SRAM through SRBM */
163 low = lower_32_bits(addr);
164 high = upper_32_bits(addr);
165
166 acp6x_writel(low, rtd->acp6x_base + ACP_SCRATCH_REG_0 + val);
167 high |= BIT(31);
168 acp6x_writel(high, rtd->acp6x_base + ACP_SCRATCH_REG_0 + val + 4);
169 val += 8;
170 addr += PAGE_SIZE;
171 }
172 }
173
acp6x_pdm_dma_open(struct snd_soc_component * component,struct snd_pcm_substream * substream)174 static int acp6x_pdm_dma_open(struct snd_soc_component *component,
175 struct snd_pcm_substream *substream)
176 {
177 struct snd_pcm_runtime *runtime;
178 struct pdm_dev_data *adata;
179 struct pdm_stream_instance *pdm_data;
180 int ret;
181
182 runtime = substream->runtime;
183 adata = dev_get_drvdata(component->dev);
184 pdm_data = kzalloc(sizeof(*pdm_data), GFP_KERNEL);
185 if (!pdm_data)
186 return -EINVAL;
187
188 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
189 runtime->hw = acp6x_pdm_hardware_capture;
190
191 ret = snd_pcm_hw_constraint_integer(runtime,
192 SNDRV_PCM_HW_PARAM_PERIODS);
193 if (ret < 0) {
194 dev_err(component->dev, "set integer constraint failed\n");
195 kfree(pdm_data);
196 return ret;
197 }
198
199 acp6x_enable_pdm_interrupts(adata->acp6x_base);
200
201 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
202 adata->capture_stream = substream;
203
204 pdm_data->acp6x_base = adata->acp6x_base;
205 runtime->private_data = pdm_data;
206 return ret;
207 }
208
acp6x_pdm_dma_hw_params(struct snd_soc_component * component,struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params)209 static int acp6x_pdm_dma_hw_params(struct snd_soc_component *component,
210 struct snd_pcm_substream *substream,
211 struct snd_pcm_hw_params *params)
212 {
213 struct pdm_stream_instance *rtd;
214 size_t size, period_bytes;
215
216 rtd = substream->runtime->private_data;
217 if (!rtd)
218 return -EINVAL;
219 size = params_buffer_bytes(params);
220 period_bytes = params_period_bytes(params);
221 rtd->dma_addr = substream->runtime->dma_addr;
222 rtd->num_pages = (PAGE_ALIGN(size) >> PAGE_SHIFT);
223 acp6x_config_dma(rtd, substream->stream);
224 acp6x_init_pdm_ring_buffer(PDM_MEM_WINDOW_START, size,
225 period_bytes, rtd->acp6x_base);
226 return 0;
227 }
228
acp6x_pdm_get_byte_count(struct pdm_stream_instance * rtd,int direction)229 static u64 acp6x_pdm_get_byte_count(struct pdm_stream_instance *rtd,
230 int direction)
231 {
232 union acp_pdm_dma_count byte_count;
233
234 byte_count.bcount.high =
235 acp6x_readl(rtd->acp6x_base + ACP_WOV_RX_LINEARPOSITIONCNTR_HIGH);
236 byte_count.bcount.low =
237 acp6x_readl(rtd->acp6x_base + ACP_WOV_RX_LINEARPOSITIONCNTR_LOW);
238 return byte_count.bytescount;
239 }
240
acp6x_pdm_dma_pointer(struct snd_soc_component * comp,struct snd_pcm_substream * stream)241 static snd_pcm_uframes_t acp6x_pdm_dma_pointer(struct snd_soc_component *comp,
242 struct snd_pcm_substream *stream)
243 {
244 struct pdm_stream_instance *rtd;
245 u32 pos, buffersize;
246 u64 bytescount;
247
248 rtd = stream->runtime->private_data;
249 buffersize = frames_to_bytes(stream->runtime,
250 stream->runtime->buffer_size);
251 bytescount = acp6x_pdm_get_byte_count(rtd, stream->stream);
252 if (bytescount > rtd->bytescount)
253 bytescount -= rtd->bytescount;
254 pos = do_div(bytescount, buffersize);
255 return bytes_to_frames(stream->runtime, pos);
256 }
257
acp6x_pdm_dma_new(struct snd_soc_component * component,struct snd_soc_pcm_runtime * rtd)258 static int acp6x_pdm_dma_new(struct snd_soc_component *component,
259 struct snd_soc_pcm_runtime *rtd)
260 {
261 struct device *parent = component->dev->parent;
262
263 snd_pcm_set_managed_buffer_all(rtd->pcm, SNDRV_DMA_TYPE_DEV,
264 parent, MIN_BUFFER, MAX_BUFFER);
265 return 0;
266 }
267
acp6x_pdm_dma_close(struct snd_soc_component * component,struct snd_pcm_substream * substream)268 static int acp6x_pdm_dma_close(struct snd_soc_component *component,
269 struct snd_pcm_substream *substream)
270 {
271 struct pdm_dev_data *adata = dev_get_drvdata(component->dev);
272
273 acp6x_disable_pdm_interrupts(adata->acp6x_base);
274 adata->capture_stream = NULL;
275 return 0;
276 }
277
acp6x_pdm_dai_trigger(struct snd_pcm_substream * substream,int cmd,struct snd_soc_dai * dai)278 static int acp6x_pdm_dai_trigger(struct snd_pcm_substream *substream,
279 int cmd, struct snd_soc_dai *dai)
280 {
281 struct pdm_stream_instance *rtd;
282 int ret;
283 bool pdm_status;
284 unsigned int ch_mask;
285
286 rtd = substream->runtime->private_data;
287 ret = 0;
288 switch (substream->runtime->channels) {
289 case TWO_CH:
290 ch_mask = 0x00;
291 break;
292 default:
293 return -EINVAL;
294 }
295 switch (cmd) {
296 case SNDRV_PCM_TRIGGER_START:
297 case SNDRV_PCM_TRIGGER_RESUME:
298 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
299 acp6x_writel(ch_mask, rtd->acp6x_base + ACP_WOV_PDM_NO_OF_CHANNELS);
300 acp6x_writel(PDM_DECIMATION_FACTOR, rtd->acp6x_base +
301 ACP_WOV_PDM_DECIMATION_FACTOR);
302 rtd->bytescount = acp6x_pdm_get_byte_count(rtd, substream->stream);
303 pdm_status = acp6x_check_pdm_dma_status(rtd->acp6x_base);
304 if (!pdm_status)
305 ret = acp6x_start_pdm_dma(rtd->acp6x_base);
306 break;
307 case SNDRV_PCM_TRIGGER_STOP:
308 case SNDRV_PCM_TRIGGER_SUSPEND:
309 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
310 pdm_status = acp6x_check_pdm_dma_status(rtd->acp6x_base);
311 if (pdm_status)
312 ret = acp6x_stop_pdm_dma(rtd->acp6x_base);
313 break;
314 default:
315 ret = -EINVAL;
316 break;
317 }
318 return ret;
319 }
320
321 static struct snd_soc_dai_ops acp6x_pdm_dai_ops = {
322 .trigger = acp6x_pdm_dai_trigger,
323 };
324
325 static struct snd_soc_dai_driver acp6x_pdm_dai_driver = {
326 .capture = {
327 .rates = SNDRV_PCM_RATE_48000,
328 .formats = SNDRV_PCM_FMTBIT_S32_LE,
329 .channels_min = 2,
330 .channels_max = 2,
331 .rate_min = 48000,
332 .rate_max = 48000,
333 },
334 .ops = &acp6x_pdm_dai_ops,
335 };
336
337 static const struct snd_soc_component_driver acp6x_pdm_component = {
338 .name = DRV_NAME,
339 .open = acp6x_pdm_dma_open,
340 .close = acp6x_pdm_dma_close,
341 .hw_params = acp6x_pdm_dma_hw_params,
342 .pointer = acp6x_pdm_dma_pointer,
343 .pcm_construct = acp6x_pdm_dma_new,
344 };
345
acp6x_pdm_audio_probe(struct platform_device * pdev)346 static int acp6x_pdm_audio_probe(struct platform_device *pdev)
347 {
348 struct resource *res;
349 struct pdm_dev_data *adata;
350 int status;
351
352 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
353 if (!res) {
354 dev_err(&pdev->dev, "IORESOURCE_MEM FAILED\n");
355 return -ENODEV;
356 }
357
358 adata = devm_kzalloc(&pdev->dev, sizeof(*adata), GFP_KERNEL);
359 if (!adata)
360 return -ENOMEM;
361
362 adata->acp6x_base = devm_ioremap(&pdev->dev, res->start, resource_size(res));
363 if (!adata->acp6x_base)
364 return -ENOMEM;
365
366 adata->capture_stream = NULL;
367
368 dev_set_drvdata(&pdev->dev, adata);
369 status = devm_snd_soc_register_component(&pdev->dev,
370 &acp6x_pdm_component,
371 &acp6x_pdm_dai_driver, 1);
372 if (status) {
373 dev_err(&pdev->dev, "Fail to register acp pdm dai\n");
374
375 return -ENODEV;
376 }
377 pm_runtime_set_autosuspend_delay(&pdev->dev, ACP_SUSPEND_DELAY_MS);
378 pm_runtime_use_autosuspend(&pdev->dev);
379 pm_runtime_enable(&pdev->dev);
380 pm_runtime_allow(&pdev->dev);
381 return 0;
382 }
383
acp6x_pdm_audio_remove(struct platform_device * pdev)384 static int acp6x_pdm_audio_remove(struct platform_device *pdev)
385 {
386 pm_runtime_disable(&pdev->dev);
387 return 0;
388 }
389
acp6x_pdm_resume(struct device * dev)390 static int __maybe_unused acp6x_pdm_resume(struct device *dev)
391 {
392 struct pdm_dev_data *adata;
393 struct snd_pcm_runtime *runtime;
394 struct pdm_stream_instance *rtd;
395 u32 period_bytes, buffer_len;
396
397 adata = dev_get_drvdata(dev);
398 if (adata->capture_stream && adata->capture_stream->runtime) {
399 runtime = adata->capture_stream->runtime;
400 rtd = runtime->private_data;
401 period_bytes = frames_to_bytes(runtime, runtime->period_size);
402 buffer_len = frames_to_bytes(runtime, runtime->buffer_size);
403 acp6x_config_dma(rtd, SNDRV_PCM_STREAM_CAPTURE);
404 acp6x_init_pdm_ring_buffer(PDM_MEM_WINDOW_START, buffer_len,
405 period_bytes, adata->acp6x_base);
406 }
407 acp6x_enable_pdm_interrupts(adata->acp6x_base);
408 return 0;
409 }
410
acp6x_pdm_suspend(struct device * dev)411 static int __maybe_unused acp6x_pdm_suspend(struct device *dev)
412 {
413 struct pdm_dev_data *adata;
414
415 adata = dev_get_drvdata(dev);
416 acp6x_disable_pdm_interrupts(adata->acp6x_base);
417 return 0;
418 }
419
acp6x_pdm_runtime_resume(struct device * dev)420 static int __maybe_unused acp6x_pdm_runtime_resume(struct device *dev)
421 {
422 struct pdm_dev_data *adata;
423
424 adata = dev_get_drvdata(dev);
425 acp6x_enable_pdm_interrupts(adata->acp6x_base);
426 return 0;
427 }
428
429 static const struct dev_pm_ops acp6x_pdm_pm_ops = {
430 SET_RUNTIME_PM_OPS(acp6x_pdm_suspend, acp6x_pdm_runtime_resume, NULL)
431 SET_SYSTEM_SLEEP_PM_OPS(acp6x_pdm_suspend, acp6x_pdm_resume)
432 };
433
434 static struct platform_driver acp6x_pdm_dma_driver = {
435 .probe = acp6x_pdm_audio_probe,
436 .remove = acp6x_pdm_audio_remove,
437 .driver = {
438 .name = "acp_yc_pdm_dma",
439 .pm = &acp6x_pdm_pm_ops,
440 },
441 };
442
443 module_platform_driver(acp6x_pdm_dma_driver);
444
445 MODULE_AUTHOR("Vijendar.Mukunda@amd.com");
446 MODULE_DESCRIPTION("AMD ACP6x YC PDM Driver");
447 MODULE_LICENSE("GPL v2");
448 MODULE_ALIAS("platform:" DRV_NAME);
449