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_mark_last_busy(&pdev->dev);
387 pm_runtime_set_active(&pdev->dev);
388 pm_runtime_enable(&pdev->dev);
389 return 0;
390 }
391
392 static void acp6x_pdm_audio_remove(struct platform_device *pdev)
393 {
394 pm_runtime_disable(&pdev->dev);
395 }
396
397 static int __maybe_unused acp6x_pdm_resume(struct device *dev)
398 {
399 struct pdm_dev_data *adata;
400 struct snd_pcm_runtime *runtime;
401 struct pdm_stream_instance *rtd;
402 u32 period_bytes, buffer_len;
403
404 adata = dev_get_drvdata(dev);
405 if (adata->capture_stream && adata->capture_stream->runtime) {
406 runtime = adata->capture_stream->runtime;
407 rtd = runtime->private_data;
408 period_bytes = frames_to_bytes(runtime, runtime->period_size);
409 buffer_len = frames_to_bytes(runtime, runtime->buffer_size);
410 acp6x_config_dma(rtd, SNDRV_PCM_STREAM_CAPTURE);
411 acp6x_init_pdm_ring_buffer(PDM_MEM_WINDOW_START, buffer_len,
412 period_bytes, adata->acp6x_base);
413 }
414 acp6x_enable_pdm_interrupts(adata->acp6x_base);
415 return 0;
416 }
417
418 static int __maybe_unused acp6x_pdm_suspend(struct device *dev)
419 {
420 struct pdm_dev_data *adata;
421
422 adata = dev_get_drvdata(dev);
423 acp6x_disable_pdm_interrupts(adata->acp6x_base);
424 return 0;
425 }
426
427 static int __maybe_unused acp6x_pdm_runtime_resume(struct device *dev)
428 {
429 struct pdm_dev_data *adata;
430
431 adata = dev_get_drvdata(dev);
432 acp6x_enable_pdm_interrupts(adata->acp6x_base);
433 return 0;
434 }
435
436 static const struct dev_pm_ops acp6x_pdm_pm_ops = {
437 SET_RUNTIME_PM_OPS(acp6x_pdm_suspend, acp6x_pdm_runtime_resume, NULL)
438 SET_SYSTEM_SLEEP_PM_OPS(acp6x_pdm_suspend, acp6x_pdm_resume)
439 };
440
441 static struct platform_driver acp6x_pdm_dma_driver = {
442 .probe = acp6x_pdm_audio_probe,
443 .remove_new = acp6x_pdm_audio_remove,
444 .driver = {
445 .name = "acp_yc_pdm_dma",
446 .pm = &acp6x_pdm_pm_ops,
447 },
448 };
449
450 module_platform_driver(acp6x_pdm_dma_driver);
451
452 MODULE_AUTHOR("Vijendar.Mukunda@amd.com");
453 MODULE_DESCRIPTION("AMD ACP6x YC PDM Driver");
454 MODULE_LICENSE("GPL v2");
455 MODULE_ALIAS("platform:" DRV_NAME);
456
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