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(val: physical_addr, base_addr: acp_base + ACP_WOV_RX_RINGBUFADDR); |
49 | acp6x_writel(val: buffer_size, base_addr: acp_base + ACP_WOV_RX_RINGBUFSIZE); |
50 | acp6x_writel(val: watermark_size, base_addr: acp_base + ACP_WOV_RX_INTR_WATERMARK_SIZE); |
51 | acp6x_writel(val: 0x01, base_addr: 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(val: pdm_clk_enable, base_addr: acp_base + ACP_WOV_CLK_CTRL); |
62 | pdm_ctrl = acp6x_readl(base_addr: 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(val: pdm_ctrl, base_addr: 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(base_addr: acp_base + ACP_EXTERNAL_INTR_CNTL); |
73 | ext_int_ctrl |= PDM_DMA_INTR_MASK; |
74 | acp6x_writel(val: ext_int_ctrl, base_addr: 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(base_addr: acp_base + ACP_EXTERNAL_INTR_CNTL); |
82 | ext_int_ctrl &= ~PDM_DMA_INTR_MASK; |
83 | acp6x_writel(val: ext_int_ctrl, base_addr: 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(base_addr: acp_base + ACP_WOV_PDM_ENABLE); |
93 | pdm_dma_enable = acp6x_readl(base_addr: 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(val: pdm_enable, base_addr: acp_base + ACP_WOV_PDM_ENABLE); |
111 | acp6x_writel(val: pdm_dma_enable, base_addr: acp_base + ACP_WOV_PDM_DMA_ENABLE); |
112 | timeout = 0; |
113 | while (++timeout < ACP_COUNTER) { |
114 | pdm_dma_enable = acp6x_readl(base_addr: 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(base_addr: acp_base + ACP_WOV_PDM_ENABLE); |
131 | pdm_dma_enable = acp6x_readl(base_addr: acp_base + ACP_WOV_PDM_DMA_ENABLE); |
132 | if (pdm_dma_enable & 0x01) { |
133 | pdm_dma_enable = 0x02; |
134 | acp6x_writel(val: pdm_dma_enable, base_addr: acp_base + ACP_WOV_PDM_DMA_ENABLE); |
135 | timeout = 0; |
136 | while (++timeout < ACP_COUNTER) { |
137 | pdm_dma_enable = acp6x_readl(base_addr: 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(val: pdm_enable, base_addr: acp_base + ACP_WOV_PDM_ENABLE); |
148 | } |
149 | acp6x_writel(val: 0x01, base_addr: 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), base_addr: rtd->acp6x_base + |
164 | ACPAXI2AXI_ATU_BASE_ADDR_GRP_1); |
165 | acp6x_writel(PAGE_SIZE_4K_ENABLE, base_addr: 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(val: low, base_addr: rtd->acp6x_base + ACP_SCRATCH_REG_0 + val); |
173 | high |= BIT(31); |
174 | acp6x_writel(val: high, base_addr: 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(dev: component->dev); |
190 | pdm_data = kzalloc(size: 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(objp: pdm_data); |
202 | return ret; |
203 | } |
204 | |
205 | acp6x_enable_pdm_interrupts(acp_base: 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(p: params); |
226 | period_bytes = params_period_bytes(p: params); |
227 | rtd->dma_addr = substream->runtime->dma_addr; |
228 | rtd->num_pages = (PAGE_ALIGN(size) >> PAGE_SHIFT); |
229 | acp6x_config_dma(rtd, direction: substream->stream); |
230 | acp6x_init_pdm_ring_buffer(PDM_MEM_WINDOW_START, buffer_size: size, |
231 | watermark_size: period_bytes, acp_base: 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(base_addr: rtd->acp6x_base + ACP_WOV_RX_LINEARPOSITIONCNTR_HIGH); |
242 | byte_count.bcount.low = |
243 | acp6x_readl(base_addr: 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(runtime: stream->runtime, |
256 | size: stream->runtime->buffer_size); |
257 | bytescount = acp6x_pdm_get_byte_count(rtd, direction: stream->stream); |
258 | if (bytescount > rtd->bytescount) |
259 | bytescount -= rtd->bytescount; |
260 | pos = do_div(bytescount, buffersize); |
261 | return bytes_to_frames(runtime: stream->runtime, size: 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(pcm: rtd->pcm, SNDRV_DMA_TYPE_DEV, |
270 | data: 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(dev: component->dev); |
278 | |
279 | acp6x_disable_pdm_interrupts(acp_base: 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(val: ch_mask, base_addr: rtd->acp6x_base + ACP_WOV_PDM_NO_OF_CHANNELS); |
306 | acp6x_writel(PDM_DECIMATION_FACTOR, base_addr: rtd->acp6x_base + |
307 | ACP_WOV_PDM_DECIMATION_FACTOR); |
308 | rtd->bytescount = acp6x_pdm_get_byte_count(rtd, direction: substream->stream); |
309 | pdm_status = acp6x_check_pdm_dma_status(acp_base: rtd->acp6x_base); |
310 | if (!pdm_status) |
311 | ret = acp6x_start_pdm_dma(acp_base: 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(acp_base: rtd->acp6x_base); |
317 | if (pdm_status) |
318 | ret = acp6x_stop_pdm_dma(acp_base: 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(dev: &pdev->dev, size: sizeof(*adata), GFP_KERNEL); |
366 | if (!adata) |
367 | return -ENOMEM; |
368 | |
369 | adata->acp6x_base = devm_ioremap(dev: &pdev->dev, offset: res->start, size: resource_size(res)); |
370 | if (!adata->acp6x_base) |
371 | return -ENOMEM; |
372 | |
373 | adata->capture_stream = NULL; |
374 | |
375 | dev_set_drvdata(dev: &pdev->dev, data: adata); |
376 | status = devm_snd_soc_register_component(dev: &pdev->dev, |
377 | component_driver: &acp6x_pdm_component, |
378 | dai_drv: &acp6x_pdm_dai_driver, num_dai: 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(dev: &pdev->dev, ACP_SUSPEND_DELAY_MS); |
385 | pm_runtime_use_autosuspend(dev: &pdev->dev); |
386 | pm_runtime_mark_last_busy(dev: &pdev->dev); |
387 | pm_runtime_set_active(dev: &pdev->dev); |
388 | pm_runtime_enable(dev: &pdev->dev); |
389 | return 0; |
390 | } |
391 | |
392 | static void acp6x_pdm_audio_remove(struct platform_device *pdev) |
393 | { |
394 | pm_runtime_disable(dev: &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, size: runtime->period_size); |
409 | buffer_len = frames_to_bytes(runtime, size: runtime->buffer_size); |
410 | acp6x_config_dma(rtd, direction: SNDRV_PCM_STREAM_CAPTURE); |
411 | acp6x_init_pdm_ring_buffer(PDM_MEM_WINDOW_START, buffer_size: buffer_len, |
412 | watermark_size: period_bytes, acp_base: adata->acp6x_base); |
413 | } |
414 | acp6x_enable_pdm_interrupts(acp_base: 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(acp_base: 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(acp_base: 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 | |