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7#include <linux/platform_device.h>
8#include <linux/module.h>
9#include <linux/err.h>
10#include <linux/io.h>
11#include <linux/pm_runtime.h>
12#include <sound/pcm_params.h>
13#include <sound/soc.h>
14#include <sound/soc-dai.h>
15
16#include "rn_acp3x.h"
17
18#define DRV_NAME "acp_rn_pdm_dma"
19
20static const struct snd_pcm_hardware acp_pdm_hardware_capture = {
21 .info = SNDRV_PCM_INFO_INTERLEAVED |
22 SNDRV_PCM_INFO_BLOCK_TRANSFER |
23 SNDRV_PCM_INFO_MMAP |
24 SNDRV_PCM_INFO_MMAP_VALID |
25 SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME,
26 .formats = SNDRV_PCM_FMTBIT_S32_LE,
27 .channels_min = 2,
28 .channels_max = 2,
29 .rates = SNDRV_PCM_RATE_48000,
30 .rate_min = 48000,
31 .rate_max = 48000,
32 .buffer_bytes_max = CAPTURE_MAX_NUM_PERIODS * CAPTURE_MAX_PERIOD_SIZE,
33 .period_bytes_min = CAPTURE_MIN_PERIOD_SIZE,
34 .period_bytes_max = CAPTURE_MAX_PERIOD_SIZE,
35 .periods_min = CAPTURE_MIN_NUM_PERIODS,
36 .periods_max = CAPTURE_MAX_NUM_PERIODS,
37};
38
39static irqreturn_t pdm_irq_handler(int irq, void *dev_id)
40{
41 struct pdm_dev_data *rn_pdm_data;
42 u16 cap_flag;
43 u32 val;
44
45 rn_pdm_data = dev_id;
46 if (!rn_pdm_data)
47 return IRQ_NONE;
48
49 cap_flag = 0;
50 val = rn_readl(rn_pdm_data->acp_base + ACP_EXTERNAL_INTR_STAT);
51 if ((val & BIT(PDM_DMA_STAT)) && rn_pdm_data->capture_stream) {
52 rn_writel(BIT(PDM_DMA_STAT), rn_pdm_data->acp_base +
53 ACP_EXTERNAL_INTR_STAT);
54 snd_pcm_period_elapsed(rn_pdm_data->capture_stream);
55 cap_flag = 1;
56 }
57
58 if (cap_flag)
59 return IRQ_HANDLED;
60 else
61 return IRQ_NONE;
62}
63
64static void init_pdm_ring_buffer(u32 physical_addr,
65 u32 buffer_size,
66 u32 watermark_size,
67 void __iomem *acp_base)
68{
69 rn_writel(physical_addr, acp_base + ACP_WOV_RX_RINGBUFADDR);
70 rn_writel(buffer_size, acp_base + ACP_WOV_RX_RINGBUFSIZE);
71 rn_writel(watermark_size, acp_base + ACP_WOV_RX_INTR_WATERMARK_SIZE);
72 rn_writel(0x01, acp_base + ACPAXI2AXI_ATU_CTRL);
73}
74
75static void enable_pdm_clock(void __iomem *acp_base)
76{
77 u32 pdm_clk_enable, pdm_ctrl;
78
79 pdm_clk_enable = ACP_PDM_CLK_FREQ_MASK;
80
81 rn_writel(pdm_clk_enable, acp_base + ACP_WOV_CLK_CTRL);
82 pdm_ctrl = rn_readl(acp_base + ACP_WOV_MISC_CTRL);
83 pdm_ctrl |= ACP_WOV_MISC_CTRL_MASK;
84 rn_writel(pdm_ctrl, acp_base + ACP_WOV_MISC_CTRL);
85}
86
87static void enable_pdm_interrupts(void __iomem *acp_base)
88{
89 u32 ext_int_ctrl;
90
91 ext_int_ctrl = rn_readl(acp_base + ACP_EXTERNAL_INTR_CNTL);
92 ext_int_ctrl |= PDM_DMA_INTR_MASK;
93 rn_writel(ext_int_ctrl, acp_base + ACP_EXTERNAL_INTR_CNTL);
94}
95
96static void disable_pdm_interrupts(void __iomem *acp_base)
97{
98 u32 ext_int_ctrl;
99
100 ext_int_ctrl = rn_readl(acp_base + ACP_EXTERNAL_INTR_CNTL);
101 ext_int_ctrl |= ~PDM_DMA_INTR_MASK;
102 rn_writel(ext_int_ctrl, acp_base + ACP_EXTERNAL_INTR_CNTL);
103}
104
105static bool check_pdm_dma_status(void __iomem *acp_base)
106{
107 bool pdm_dma_status;
108 u32 pdm_enable, pdm_dma_enable;
109
110 pdm_dma_status = false;
111 pdm_enable = rn_readl(acp_base + ACP_WOV_PDM_ENABLE);
112 pdm_dma_enable = rn_readl(acp_base + ACP_WOV_PDM_DMA_ENABLE);
113 if ((pdm_enable & ACP_PDM_ENABLE) && (pdm_dma_enable &
114 ACP_PDM_DMA_EN_STATUS))
115 pdm_dma_status = true;
116 return pdm_dma_status;
117}
118
119static int start_pdm_dma(void __iomem *acp_base)
120{
121 u32 pdm_enable;
122 u32 pdm_dma_enable;
123 int timeout;
124
125 pdm_enable = 0x01;
126 pdm_dma_enable = 0x01;
127
128 enable_pdm_clock(acp_base);
129 rn_writel(pdm_enable, acp_base + ACP_WOV_PDM_ENABLE);
130 rn_writel(pdm_dma_enable, acp_base + ACP_WOV_PDM_DMA_ENABLE);
131 timeout = 0;
132 while (++timeout < ACP_COUNTER) {
133 pdm_dma_enable = rn_readl(acp_base + ACP_WOV_PDM_DMA_ENABLE);
134 if ((pdm_dma_enable & 0x02) == ACP_PDM_DMA_EN_STATUS)
135 return 0;
136 udelay(DELAY_US);
137 }
138 return -ETIMEDOUT;
139}
140
141static int stop_pdm_dma(void __iomem *acp_base)
142{
143 u32 pdm_enable, pdm_dma_enable;
144 int timeout;
145
146 pdm_enable = rn_readl(acp_base + ACP_WOV_PDM_ENABLE);
147 pdm_dma_enable = rn_readl(acp_base + ACP_WOV_PDM_DMA_ENABLE);
148 if (pdm_dma_enable & 0x01) {
149 pdm_dma_enable = 0x02;
150 rn_writel(pdm_dma_enable, acp_base + ACP_WOV_PDM_DMA_ENABLE);
151 timeout = 0;
152 while (++timeout < ACP_COUNTER) {
153 pdm_dma_enable = rn_readl(acp_base +
154 ACP_WOV_PDM_DMA_ENABLE);
155 if ((pdm_dma_enable & 0x02) == 0x00)
156 break;
157 udelay(DELAY_US);
158 }
159 if (timeout == ACP_COUNTER)
160 return -ETIMEDOUT;
161 }
162 if (pdm_enable == ACP_PDM_ENABLE) {
163 pdm_enable = ACP_PDM_DISABLE;
164 rn_writel(pdm_enable, acp_base + ACP_WOV_PDM_ENABLE);
165 }
166 rn_writel(0x01, acp_base + ACP_WOV_PDM_FIFO_FLUSH);
167 return 0;
168}
169
170static void config_acp_dma(struct pdm_stream_instance *rtd, int direction)
171{
172 u16 page_idx;
173 u32 low, high, val;
174 dma_addr_t addr;
175
176 addr = rtd->dma_addr;
177 val = 0;
178
179
180 rn_writel(ACP_SRAM_PTE_OFFSET | BIT(31), rtd->acp_base +
181 ACPAXI2AXI_ATU_BASE_ADDR_GRP_1);
182 rn_writel(PAGE_SIZE_4K_ENABLE, rtd->acp_base +
183 ACPAXI2AXI_ATU_PAGE_SIZE_GRP_1);
184
185 for (page_idx = 0; page_idx < rtd->num_pages; page_idx++) {
186
187 low = lower_32_bits(addr);
188 high = upper_32_bits(addr);
189
190 rn_writel(low, rtd->acp_base + ACP_SCRATCH_REG_0 + val);
191 high |= BIT(31);
192 rn_writel(high, rtd->acp_base + ACP_SCRATCH_REG_0 + val + 4);
193 val += 8;
194 addr += PAGE_SIZE;
195 }
196}
197
198static int acp_pdm_dma_open(struct snd_soc_component *component,
199 struct snd_pcm_substream *substream)
200{
201 struct snd_pcm_runtime *runtime;
202 struct pdm_dev_data *adata;
203 struct pdm_stream_instance *pdm_data;
204 int ret;
205
206 runtime = substream->runtime;
207 adata = dev_get_drvdata(component->dev);
208 pdm_data = kzalloc(sizeof(*pdm_data), GFP_KERNEL);
209 if (!pdm_data)
210 return -EINVAL;
211
212 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
213 runtime->hw = acp_pdm_hardware_capture;
214
215 ret = snd_pcm_hw_constraint_integer(runtime,
216 SNDRV_PCM_HW_PARAM_PERIODS);
217 if (ret < 0) {
218 dev_err(component->dev, "set integer constraint failed\n");
219 kfree(pdm_data);
220 return ret;
221 }
222
223 enable_pdm_interrupts(adata->acp_base);
224
225 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
226 adata->capture_stream = substream;
227
228 pdm_data->acp_base = adata->acp_base;
229 runtime->private_data = pdm_data;
230 return ret;
231}
232
233static int acp_pdm_dma_hw_params(struct snd_soc_component *component,
234 struct snd_pcm_substream *substream,
235 struct snd_pcm_hw_params *params)
236{
237 struct pdm_stream_instance *rtd;
238 size_t size, period_bytes;
239
240 rtd = substream->runtime->private_data;
241 if (!rtd)
242 return -EINVAL;
243 size = params_buffer_bytes(params);
244 period_bytes = params_period_bytes(params);
245 rtd->dma_addr = substream->runtime->dma_addr;
246 rtd->num_pages = (PAGE_ALIGN(size) >> PAGE_SHIFT);
247 config_acp_dma(rtd, substream->stream);
248 init_pdm_ring_buffer(MEM_WINDOW_START, size, period_bytes,
249 rtd->acp_base);
250 return 0;
251}
252
253static u64 acp_pdm_get_byte_count(struct pdm_stream_instance *rtd,
254 int direction)
255{
256 union acp_pdm_dma_count byte_count;
257
258 byte_count.bcount.high =
259 rn_readl(rtd->acp_base +
260 ACP_WOV_RX_LINEARPOSITIONCNTR_HIGH);
261 byte_count.bcount.low =
262 rn_readl(rtd->acp_base +
263 ACP_WOV_RX_LINEARPOSITIONCNTR_LOW);
264 return byte_count.bytescount;
265}
266
267static snd_pcm_uframes_t acp_pdm_dma_pointer(struct snd_soc_component *comp,
268 struct snd_pcm_substream *stream)
269{
270 struct pdm_stream_instance *rtd;
271 u32 pos, buffersize;
272 u64 bytescount;
273
274 rtd = stream->runtime->private_data;
275 buffersize = frames_to_bytes(stream->runtime,
276 stream->runtime->buffer_size);
277 bytescount = acp_pdm_get_byte_count(rtd, stream->stream);
278 if (bytescount > rtd->bytescount)
279 bytescount -= rtd->bytescount;
280 pos = do_div(bytescount, buffersize);
281 return bytes_to_frames(stream->runtime, pos);
282}
283
284static int acp_pdm_dma_new(struct snd_soc_component *component,
285 struct snd_soc_pcm_runtime *rtd)
286{
287 struct device *parent = component->dev->parent;
288
289 snd_pcm_set_managed_buffer_all(rtd->pcm, SNDRV_DMA_TYPE_DEV,
290 parent, MIN_BUFFER, MAX_BUFFER);
291 return 0;
292}
293
294static int acp_pdm_dma_close(struct snd_soc_component *component,
295 struct snd_pcm_substream *substream)
296{
297 struct pdm_dev_data *adata = dev_get_drvdata(component->dev);
298
299 disable_pdm_interrupts(adata->acp_base);
300 adata->capture_stream = NULL;
301 return 0;
302}
303
304static int acp_pdm_dai_trigger(struct snd_pcm_substream *substream,
305 int cmd, struct snd_soc_dai *dai)
306{
307 struct pdm_stream_instance *rtd;
308 int ret;
309 bool pdm_status;
310 unsigned int ch_mask;
311
312 rtd = substream->runtime->private_data;
313 ret = 0;
314 switch (substream->runtime->channels) {
315 case TWO_CH:
316 ch_mask = 0x00;
317 break;
318 default:
319 return -EINVAL;
320 }
321 switch (cmd) {
322 case SNDRV_PCM_TRIGGER_START:
323 case SNDRV_PCM_TRIGGER_RESUME:
324 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
325 rn_writel(ch_mask, rtd->acp_base + ACP_WOV_PDM_NO_OF_CHANNELS);
326 rn_writel(PDM_DECIMATION_FACTOR, rtd->acp_base +
327 ACP_WOV_PDM_DECIMATION_FACTOR);
328 rtd->bytescount = acp_pdm_get_byte_count(rtd,
329 substream->stream);
330 pdm_status = check_pdm_dma_status(rtd->acp_base);
331 if (!pdm_status)
332 ret = start_pdm_dma(rtd->acp_base);
333 break;
334 case SNDRV_PCM_TRIGGER_STOP:
335 case SNDRV_PCM_TRIGGER_SUSPEND:
336 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
337 pdm_status = check_pdm_dma_status(rtd->acp_base);
338 if (pdm_status)
339 ret = stop_pdm_dma(rtd->acp_base);
340 break;
341 default:
342 ret = -EINVAL;
343 break;
344 }
345 return ret;
346}
347
348static const struct snd_soc_dai_ops acp_pdm_dai_ops = {
349 .trigger = acp_pdm_dai_trigger,
350};
351
352static struct snd_soc_dai_driver acp_pdm_dai_driver = {
353 .capture = {
354 .rates = SNDRV_PCM_RATE_48000,
355 .formats = SNDRV_PCM_FMTBIT_S24_LE |
356 SNDRV_PCM_FMTBIT_S32_LE,
357 .channels_min = 2,
358 .channels_max = 2,
359 .rate_min = 48000,
360 .rate_max = 48000,
361 },
362 .ops = &acp_pdm_dai_ops,
363};
364
365static const struct snd_soc_component_driver acp_pdm_component = {
366 .name = DRV_NAME,
367 .open = acp_pdm_dma_open,
368 .close = acp_pdm_dma_close,
369 .hw_params = acp_pdm_dma_hw_params,
370 .pointer = acp_pdm_dma_pointer,
371 .pcm_construct = acp_pdm_dma_new,
372};
373
374static int acp_pdm_audio_probe(struct platform_device *pdev)
375{
376 struct resource *res;
377 struct pdm_dev_data *adata;
378 unsigned int irqflags;
379 int status;
380
381 if (!pdev->dev.platform_data) {
382 dev_err(&pdev->dev, "platform_data not retrieved\n");
383 return -ENODEV;
384 }
385 irqflags = *((unsigned int *)(pdev->dev.platform_data));
386
387 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
388 if (!res) {
389 dev_err(&pdev->dev, "IORESOURCE_MEM FAILED\n");
390 return -ENODEV;
391 }
392
393 adata = devm_kzalloc(&pdev->dev, sizeof(*adata), GFP_KERNEL);
394 if (!adata)
395 return -ENOMEM;
396
397 adata->acp_base = devm_ioremap(&pdev->dev, res->start,
398 resource_size(res));
399 if (!adata->acp_base)
400 return -ENOMEM;
401
402 res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
403 if (!res) {
404 dev_err(&pdev->dev, "IORESOURCE_IRQ FAILED\n");
405 return -ENODEV;
406 }
407
408 adata->pdm_irq = res->start;
409 adata->capture_stream = NULL;
410
411 dev_set_drvdata(&pdev->dev, adata);
412 status = devm_snd_soc_register_component(&pdev->dev,
413 &acp_pdm_component,
414 &acp_pdm_dai_driver, 1);
415 if (status) {
416 dev_err(&pdev->dev, "Fail to register acp pdm dai\n");
417
418 return -ENODEV;
419 }
420 status = devm_request_irq(&pdev->dev, adata->pdm_irq, pdm_irq_handler,
421 irqflags, "ACP_PDM_IRQ", adata);
422 if (status) {
423 dev_err(&pdev->dev, "ACP PDM IRQ request failed\n");
424 return -ENODEV;
425 }
426 pm_runtime_set_autosuspend_delay(&pdev->dev, ACP_SUSPEND_DELAY_MS);
427 pm_runtime_use_autosuspend(&pdev->dev);
428 pm_runtime_enable(&pdev->dev);
429 pm_runtime_allow(&pdev->dev);
430 return 0;
431}
432
433static int acp_pdm_audio_remove(struct platform_device *pdev)
434{
435 pm_runtime_disable(&pdev->dev);
436 return 0;
437}
438
439static int acp_pdm_resume(struct device *dev)
440{
441 struct pdm_dev_data *adata;
442 struct snd_pcm_runtime *runtime;
443 struct pdm_stream_instance *rtd;
444 u32 period_bytes, buffer_len;
445
446 adata = dev_get_drvdata(dev);
447 if (adata->capture_stream && adata->capture_stream->runtime) {
448 runtime = adata->capture_stream->runtime;
449 rtd = runtime->private_data;
450 period_bytes = frames_to_bytes(runtime, runtime->period_size);
451 buffer_len = frames_to_bytes(runtime, runtime->buffer_size);
452 config_acp_dma(rtd, SNDRV_PCM_STREAM_CAPTURE);
453 init_pdm_ring_buffer(MEM_WINDOW_START, buffer_len, period_bytes,
454 adata->acp_base);
455 }
456 enable_pdm_interrupts(adata->acp_base);
457 return 0;
458}
459
460static int acp_pdm_runtime_suspend(struct device *dev)
461{
462 struct pdm_dev_data *adata;
463
464 adata = dev_get_drvdata(dev);
465 disable_pdm_interrupts(adata->acp_base);
466
467 return 0;
468}
469
470static int acp_pdm_runtime_resume(struct device *dev)
471{
472 struct pdm_dev_data *adata;
473
474 adata = dev_get_drvdata(dev);
475 enable_pdm_interrupts(adata->acp_base);
476 return 0;
477}
478
479static const struct dev_pm_ops acp_pdm_pm_ops = {
480 .runtime_suspend = acp_pdm_runtime_suspend,
481 .runtime_resume = acp_pdm_runtime_resume,
482 .resume = acp_pdm_resume,
483};
484
485static struct platform_driver acp_pdm_dma_driver = {
486 .probe = acp_pdm_audio_probe,
487 .remove = acp_pdm_audio_remove,
488 .driver = {
489 .name = "acp_rn_pdm_dma",
490 .pm = &acp_pdm_pm_ops,
491 },
492};
493
494module_platform_driver(acp_pdm_dma_driver);
495
496MODULE_AUTHOR("Vijendar.Mukunda@amd.com");
497MODULE_DESCRIPTION("AMD ACP3x Renior PDM Driver");
498MODULE_LICENSE("GPL v2");
499MODULE_ALIAS("platform:" DRV_NAME);
500
