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7610174a VM |
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> | |
02ea45d1 | 10 | #include <linux/bitfield.h> |
7610174a VM |
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> | |
4c2e711a | 16 | #include <linux/pm_runtime.h> |
7610174a VM |
17 | |
18 | #include "acp6x.h" | |
19 | ||
20 | #define DRV_NAME "acp_yc_pdm_dma" | |
21 | ||
02ea45d1 ML |
22 | static int pdm_gain = 3; |
23 | module_param(pdm_gain, int, 0644); | |
24 | MODULE_PARM_DESC(pdm_gain, "Gain control (0-3)"); | |
25 | ||
ceb4fcc1 VM |
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); | |
02ea45d1 ML |
63 | pdm_ctrl &= ~ACP_WOV_GAIN_CONTROL; |
64 | pdm_ctrl |= FIELD_PREP(ACP_WOV_GAIN_CONTROL, clamp(pdm_gain, 0, 3)); | |
ceb4fcc1 VM |
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 | ||
7bef0010 | 327 | static const struct snd_soc_dai_ops acp6x_pdm_dai_ops = { |
ceb4fcc1 VM |
328 | .trigger = acp6x_pdm_dai_trigger, |
329 | }; | |
330 | ||
7610174a VM |
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 | }, | |
ceb4fcc1 | 340 | .ops = &acp6x_pdm_dai_ops, |
7610174a VM |
341 | }; |
342 | ||
343 | static const struct snd_soc_component_driver acp6x_pdm_component = { | |
0bc1e7d1 CK |
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, | |
7610174a VM |
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 | } | |
4c2e711a VM |
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); | |
7610174a VM |
388 | return 0; |
389 | } | |
390 | ||
0e940c75 | 391 | static void acp6x_pdm_audio_remove(struct platform_device *pdev) |
4c2e711a VM |
392 | { |
393 | pm_runtime_disable(&pdev->dev); | |
4c2e711a VM |
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 | ||
7610174a VM |
440 | static struct platform_driver acp6x_pdm_dma_driver = { |
441 | .probe = acp6x_pdm_audio_probe, | |
0e940c75 | 442 | .remove_new = acp6x_pdm_audio_remove, |
7610174a VM |
443 | .driver = { |
444 | .name = "acp_yc_pdm_dma", | |
4c2e711a | 445 | .pm = &acp6x_pdm_pm_ops, |
7610174a VM |
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); |