1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * AMD ALSA SoC Pink Sardine PDM Driver
4 *
5 * Copyright 2022 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 "acp63.h"
19
20 #define DRV_NAME "acp_ps_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 acp63_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 acp63_init_pdm_ring_buffer(u32 physical_addr, u32 buffer_size,
46 u32 watermark_size, void __iomem *acp_base)
47 {
48 writel(physical_addr, acp_base + ACP_WOV_RX_RINGBUFADDR);
49 writel(buffer_size, acp_base + ACP_WOV_RX_RINGBUFSIZE);
50 writel(watermark_size, acp_base + ACP_WOV_RX_INTR_WATERMARK_SIZE);
51 writel(0x01, acp_base + ACPAXI2AXI_ATU_CTRL);
52 }
53
54 static void acp63_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 writel(pdm_clk_enable, acp_base + ACP_WOV_CLK_CTRL);
62 pdm_ctrl = 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 writel(pdm_ctrl, acp_base + ACP_WOV_MISC_CTRL);
66 }
67
68 static void acp63_enable_pdm_interrupts(struct pdm_dev_data *adata)
69 {
70 u32 ext_int_ctrl;
71
72 mutex_lock(adata->acp_lock);
73 ext_int_ctrl = readl(adata->acp63_base + ACP_EXTERNAL_INTR_CNTL);
74 ext_int_ctrl |= PDM_DMA_INTR_MASK;
75 writel(ext_int_ctrl, adata->acp63_base + ACP_EXTERNAL_INTR_CNTL);
76 mutex_unlock(adata->acp_lock);
77 }
78
79 static void acp63_disable_pdm_interrupts(struct pdm_dev_data *adata)
80 {
81 u32 ext_int_ctrl;
82
83 mutex_lock(adata->acp_lock);
84 ext_int_ctrl = readl(adata->acp63_base + ACP_EXTERNAL_INTR_CNTL);
85 ext_int_ctrl &= ~PDM_DMA_INTR_MASK;
86 writel(ext_int_ctrl, adata->acp63_base + ACP_EXTERNAL_INTR_CNTL);
87 mutex_unlock(adata->acp_lock);
88 }
89
90 static bool acp63_check_pdm_dma_status(void __iomem *acp_base)
91 {
92 bool pdm_dma_status;
93 u32 pdm_enable, pdm_dma_enable;
94
95 pdm_dma_status = false;
96 pdm_enable = readl(acp_base + ACP_WOV_PDM_ENABLE);
97 pdm_dma_enable = readl(acp_base + ACP_WOV_PDM_DMA_ENABLE);
98 if ((pdm_enable & ACP_PDM_ENABLE) && (pdm_dma_enable & ACP_PDM_DMA_EN_STATUS))
99 pdm_dma_status = true;
100
101 return pdm_dma_status;
102 }
103
104 static int acp63_start_pdm_dma(void __iomem *acp_base)
105 {
106 u32 pdm_enable;
107 u32 pdm_dma_enable;
108 int timeout;
109
110 pdm_enable = 0x01;
111 pdm_dma_enable = 0x01;
112
113 acp63_enable_pdm_clock(acp_base);
114 writel(pdm_enable, acp_base + ACP_WOV_PDM_ENABLE);
115 writel(pdm_dma_enable, acp_base + ACP_WOV_PDM_DMA_ENABLE);
116 timeout = 0;
117 while (++timeout < ACP_COUNTER) {
118 pdm_dma_enable = readl(acp_base + ACP_WOV_PDM_DMA_ENABLE);
119 if ((pdm_dma_enable & 0x02) == ACP_PDM_DMA_EN_STATUS)
120 return 0;
121 udelay(DELAY_US);
122 }
123 return -ETIMEDOUT;
124 }
125
126 static int acp63_stop_pdm_dma(void __iomem *acp_base)
127 {
128 u32 pdm_enable, pdm_dma_enable;
129 int timeout;
130
131 pdm_enable = 0x00;
132 pdm_dma_enable = 0x00;
133
134 pdm_enable = readl(acp_base + ACP_WOV_PDM_ENABLE);
135 pdm_dma_enable = readl(acp_base + ACP_WOV_PDM_DMA_ENABLE);
136 if (pdm_dma_enable & 0x01) {
137 pdm_dma_enable = 0x02;
138 writel(pdm_dma_enable, acp_base + ACP_WOV_PDM_DMA_ENABLE);
139 timeout = 0;
140 while (++timeout < ACP_COUNTER) {
141 pdm_dma_enable = readl(acp_base + ACP_WOV_PDM_DMA_ENABLE);
142 if ((pdm_dma_enable & 0x02) == 0x00)
143 break;
144 udelay(DELAY_US);
145 }
146 if (timeout == ACP_COUNTER)
147 return -ETIMEDOUT;
148 }
149 if (pdm_enable == ACP_PDM_ENABLE) {
150 pdm_enable = ACP_PDM_DISABLE;
151 writel(pdm_enable, acp_base + ACP_WOV_PDM_ENABLE);
152 }
153 writel(0x01, acp_base + ACP_WOV_PDM_FIFO_FLUSH);
154 return 0;
155 }
156
157 static void acp63_config_dma(struct pdm_stream_instance *rtd, int direction)
158 {
159 u16 page_idx;
160 u32 low, high, val;
161 dma_addr_t addr;
162
163 addr = rtd->dma_addr;
164 val = PDM_PTE_OFFSET;
165
166 /* Group Enable */
167 writel(ACP_SRAM_PTE_OFFSET | BIT(31), rtd->acp63_base + ACPAXI2AXI_ATU_BASE_ADDR_GRP_1);
168 writel(PAGE_SIZE_4K_ENABLE, rtd->acp63_base + ACPAXI2AXI_ATU_PAGE_SIZE_GRP_1);
169 for (page_idx = 0; page_idx < rtd->num_pages; page_idx++) {
170 /* Load the low address of page int ACP SRAM through SRBM */
171 low = lower_32_bits(addr);
172 high = upper_32_bits(addr);
173
174 writel(low, rtd->acp63_base + ACP_SCRATCH_REG_0 + val);
175 high |= BIT(31);
176 writel(high, rtd->acp63_base + ACP_SCRATCH_REG_0 + val + 4);
177 val += 8;
178 addr += PAGE_SIZE;
179 }
180 }
181
182 static int acp63_pdm_dma_open(struct snd_soc_component *component,
183 struct snd_pcm_substream *substream)
184 {
185 struct snd_pcm_runtime *runtime;
186 struct pdm_dev_data *adata;
187 struct pdm_stream_instance *pdm_data;
188 int ret;
189
190 runtime = substream->runtime;
191 adata = dev_get_drvdata(component->dev);
192 pdm_data = kzalloc(sizeof(*pdm_data), GFP_KERNEL);
193 if (!pdm_data)
194 return -EINVAL;
195
196 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
197 runtime->hw = acp63_pdm_hardware_capture;
198
199 ret = snd_pcm_hw_constraint_integer(runtime,
200 SNDRV_PCM_HW_PARAM_PERIODS);
201 if (ret < 0) {
202 dev_err(component->dev, "set integer constraint failed\n");
203 kfree(pdm_data);
204 return ret;
205 }
206
207 acp63_enable_pdm_interrupts(adata);
208
209 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
210 adata->capture_stream = substream;
211
212 pdm_data->acp63_base = adata->acp63_base;
213 runtime->private_data = pdm_data;
214 return ret;
215 }
216
217 static int acp63_pdm_dma_hw_params(struct snd_soc_component *component,
218 struct snd_pcm_substream *substream,
219 struct snd_pcm_hw_params *params)
220 {
221 struct pdm_stream_instance *rtd;
222 size_t size, period_bytes;
223
224 rtd = substream->runtime->private_data;
225 if (!rtd)
226 return -EINVAL;
227 size = params_buffer_bytes(params);
228 period_bytes = params_period_bytes(params);
229 rtd->dma_addr = substream->runtime->dma_addr;
230 rtd->num_pages = (PAGE_ALIGN(size) >> PAGE_SHIFT);
231 acp63_config_dma(rtd, substream->stream);
232 acp63_init_pdm_ring_buffer(PDM_MEM_WINDOW_START, size,
233 period_bytes, rtd->acp63_base);
234 return 0;
235 }
236
237 static u64 acp63_pdm_get_byte_count(struct pdm_stream_instance *rtd,
238 int direction)
239 {
240 u32 high, low;
241 u64 byte_count;
242
243 high = readl(rtd->acp63_base + ACP_WOV_RX_LINEARPOSITIONCNTR_HIGH);
244 byte_count = high;
245 low = readl(rtd->acp63_base + ACP_WOV_RX_LINEARPOSITIONCNTR_LOW);
246 byte_count = (byte_count << 32) | low;
247 return byte_count;
248 }
249
250 static snd_pcm_uframes_t acp63_pdm_dma_pointer(struct snd_soc_component *comp,
251 struct snd_pcm_substream *stream)
252 {
253 struct pdm_stream_instance *rtd;
254 u32 pos, buffersize;
255 u64 bytescount;
256
257 rtd = stream->runtime->private_data;
258 buffersize = frames_to_bytes(stream->runtime,
259 stream->runtime->buffer_size);
260 bytescount = acp63_pdm_get_byte_count(rtd, stream->stream);
261 if (bytescount > rtd->bytescount)
262 bytescount -= rtd->bytescount;
263 pos = do_div(bytescount, buffersize);
264 return bytes_to_frames(stream->runtime, pos);
265 }
266
267 static int acp63_pdm_dma_new(struct snd_soc_component *component,
268 struct snd_soc_pcm_runtime *rtd)
269 {
270 struct device *parent = component->dev->parent;
271
272 snd_pcm_set_managed_buffer_all(rtd->pcm, SNDRV_DMA_TYPE_DEV,
273 parent, MIN_BUFFER, MAX_BUFFER);
274 return 0;
275 }
276
277 static int acp63_pdm_dma_close(struct snd_soc_component *component,
278 struct snd_pcm_substream *substream)
279 {
280 struct pdm_dev_data *adata = dev_get_drvdata(component->dev);
281 struct snd_pcm_runtime *runtime = substream->runtime;
282
283 acp63_disable_pdm_interrupts(adata);
284 adata->capture_stream = NULL;
285 kfree(runtime->private_data);
286 return 0;
287 }
288
289 static int acp63_pdm_dai_trigger(struct snd_pcm_substream *substream,
290 int cmd, struct snd_soc_dai *dai)
291 {
292 struct pdm_stream_instance *rtd;
293 int ret;
294 bool pdm_status;
295 unsigned int ch_mask;
296
297 rtd = substream->runtime->private_data;
298 ret = 0;
299 switch (substream->runtime->channels) {
300 case TWO_CH:
301 ch_mask = 0x00;
302 break;
303 default:
304 return -EINVAL;
305 }
306 switch (cmd) {
307 case SNDRV_PCM_TRIGGER_START:
308 case SNDRV_PCM_TRIGGER_RESUME:
309 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
310 writel(ch_mask, rtd->acp63_base + ACP_WOV_PDM_NO_OF_CHANNELS);
311 writel(PDM_DECIMATION_FACTOR, rtd->acp63_base + ACP_WOV_PDM_DECIMATION_FACTOR);
312 rtd->bytescount = acp63_pdm_get_byte_count(rtd, substream->stream);
313 pdm_status = acp63_check_pdm_dma_status(rtd->acp63_base);
314 if (!pdm_status)
315 ret = acp63_start_pdm_dma(rtd->acp63_base);
316 break;
317 case SNDRV_PCM_TRIGGER_STOP:
318 case SNDRV_PCM_TRIGGER_SUSPEND:
319 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
320 pdm_status = acp63_check_pdm_dma_status(rtd->acp63_base);
321 if (pdm_status)
322 ret = acp63_stop_pdm_dma(rtd->acp63_base);
323 break;
324 default:
325 ret = -EINVAL;
326 break;
327 }
328 return ret;
329 }
330
331 static const struct snd_soc_dai_ops acp63_pdm_dai_ops = {
332 .trigger = acp63_pdm_dai_trigger,
333 };
334
335 static struct snd_soc_dai_driver acp63_pdm_dai_driver = {
336 .name = "acp_ps_pdm_dma.0",
337 .capture = {
338 .rates = SNDRV_PCM_RATE_48000,
339 .formats = SNDRV_PCM_FMTBIT_S32_LE,
340 .channels_min = 2,
341 .channels_max = 2,
342 .rate_min = 48000,
343 .rate_max = 48000,
344 },
345 .ops = &acp63_pdm_dai_ops,
346 };
347
348 static const struct snd_soc_component_driver acp63_pdm_component = {
349 .name = DRV_NAME,
350 .open = acp63_pdm_dma_open,
351 .close = acp63_pdm_dma_close,
352 .hw_params = acp63_pdm_dma_hw_params,
353 .pointer = acp63_pdm_dma_pointer,
354 .pcm_construct = acp63_pdm_dma_new,
355 };
356
357 static int acp63_pdm_audio_probe(struct platform_device *pdev)
358 {
359 struct resource *res;
360 struct pdm_dev_data *adata;
361 struct acp63_dev_data *acp_data;
362 struct device *parent;
363 int status;
364
365 parent = pdev->dev.parent;
366 acp_data = dev_get_drvdata(parent);
367 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
368 if (!res) {
369 dev_err(&pdev->dev, "IORESOURCE_MEM FAILED\n");
370 return -ENODEV;
371 }
372
373 adata = devm_kzalloc(&pdev->dev, sizeof(*adata), GFP_KERNEL);
374 if (!adata)
375 return -ENOMEM;
376
377 adata->acp63_base = devm_ioremap(&pdev->dev, res->start, resource_size(res));
378 if (!adata->acp63_base)
379 return -ENOMEM;
380
381 adata->capture_stream = NULL;
382 adata->acp_lock = &acp_data->acp_lock;
383 dev_set_drvdata(&pdev->dev, adata);
384 status = devm_snd_soc_register_component(&pdev->dev,
385 &acp63_pdm_component,
386 &acp63_pdm_dai_driver, 1);
387 if (status) {
388 dev_err(&pdev->dev, "Fail to register acp pdm dai\n");
389
390 return -ENODEV;
391 }
392 pm_runtime_set_autosuspend_delay(&pdev->dev, ACP_SUSPEND_DELAY_MS);
393 pm_runtime_use_autosuspend(&pdev->dev);
394 pm_runtime_mark_last_busy(&pdev->dev);
395 pm_runtime_set_active(&pdev->dev);
396 pm_runtime_enable(&pdev->dev);
397 return 0;
398 }
399
400 static void acp63_pdm_audio_remove(struct platform_device *pdev)
401 {
402 pm_runtime_disable(&pdev->dev);
403 }
404
405 static int __maybe_unused acp63_pdm_resume(struct device *dev)
406 {
407 struct pdm_dev_data *adata;
408 struct snd_pcm_runtime *runtime;
409 struct pdm_stream_instance *rtd;
410 u32 period_bytes, buffer_len;
411
412 adata = dev_get_drvdata(dev);
413 if (adata->capture_stream && adata->capture_stream->runtime) {
414 runtime = adata->capture_stream->runtime;
415 rtd = runtime->private_data;
416 period_bytes = frames_to_bytes(runtime, runtime->period_size);
417 buffer_len = frames_to_bytes(runtime, runtime->buffer_size);
418 acp63_config_dma(rtd, SNDRV_PCM_STREAM_CAPTURE);
419 acp63_init_pdm_ring_buffer(PDM_MEM_WINDOW_START, buffer_len,
420 period_bytes, adata->acp63_base);
421 }
422 acp63_enable_pdm_interrupts(adata);
423 return 0;
424 }
425
426 static int __maybe_unused acp63_pdm_suspend(struct device *dev)
427 {
428 struct pdm_dev_data *adata;
429
430 adata = dev_get_drvdata(dev);
431 acp63_disable_pdm_interrupts(adata);
432 return 0;
433 }
434
435 static int __maybe_unused acp63_pdm_runtime_resume(struct device *dev)
436 {
437 struct pdm_dev_data *adata;
438
439 adata = dev_get_drvdata(dev);
440 acp63_enable_pdm_interrupts(adata);
441 return 0;
442 }
443
444 static const struct dev_pm_ops acp63_pdm_pm_ops = {
445 SET_RUNTIME_PM_OPS(acp63_pdm_suspend, acp63_pdm_runtime_resume, NULL)
446 SET_SYSTEM_SLEEP_PM_OPS(acp63_pdm_suspend, acp63_pdm_resume)
447 };
448
449 static struct platform_driver acp63_pdm_dma_driver = {
450 .probe = acp63_pdm_audio_probe,
451 .remove_new = acp63_pdm_audio_remove,
452 .driver = {
453 .name = "acp_ps_pdm_dma",
454 .pm = &acp63_pdm_pm_ops,
455 },
456 };
457
458 module_platform_driver(acp63_pdm_dma_driver);
459
460 MODULE_AUTHOR("Syed.SabaKareem@amd.com");
461 MODULE_DESCRIPTION("AMD PINK SARDINE PDM Driver");
462 MODULE_LICENSE("GPL v2");
463 MODULE_ALIAS("platform:" DRV_NAME);
464
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.