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TOMOYO Linux Cross Reference
Linux/sound/soc/rockchip/rockchip_pdm.c

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  1 /*
  2  * Rockchip PDM ALSA SoC Digital Audio Interface(DAI)  driver
  3  *
  4  * Copyright (C) 2017 Fuzhou Rockchip Electronics Co., Ltd
  5  *
  6  * This software is licensed under the terms of the GNU General Public
  7  * License version 2, as published by the Free Software Foundation, and
  8  * may be copied, distributed, and modified under those terms.
  9  *
 10  * This program is distributed in the hope that it will be useful,
 11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 13  * GNU General Public License for more details.
 14  *
 15  */
 16 
 17 #include <linux/module.h>
 18 #include <linux/clk.h>
 19 #include <linux/of.h>
 20 #include <linux/pm_runtime.h>
 21 #include <linux/regmap.h>
 22 #include <sound/dmaengine_pcm.h>
 23 #include <sound/pcm_params.h>
 24 
 25 #include "rockchip_pdm.h"
 26 
 27 #define PDM_DMA_BURST_SIZE      (16) /* size * width: 16*4 = 64 bytes */
 28 
 29 struct rk_pdm_dev {
 30         struct device *dev;
 31         struct clk *clk;
 32         struct clk *hclk;
 33         struct regmap *regmap;
 34         struct snd_dmaengine_dai_dma_data capture_dma_data;
 35 };
 36 
 37 struct rk_pdm_clkref {
 38         unsigned int sr;
 39         unsigned int clk;
 40 };
 41 
 42 static struct rk_pdm_clkref clkref[] = {
 43         { 8000, 40960000 },
 44         { 11025, 56448000 },
 45         { 12000, 61440000 },
 46 };
 47 
 48 static unsigned int get_pdm_clk(unsigned int sr)
 49 {
 50         unsigned int i, count, clk, div;
 51 
 52         clk = 0;
 53         if (!sr)
 54                 return clk;
 55 
 56         count = ARRAY_SIZE(clkref);
 57         for (i = 0; i < count; i++) {
 58                 if (sr % clkref[i].sr)
 59                         continue;
 60                 div = sr / clkref[i].sr;
 61                 if ((div & (div - 1)) == 0) {
 62                         clk = clkref[i].clk;
 63                         break;
 64                 }
 65         }
 66 
 67         return clk;
 68 }
 69 
 70 static inline struct rk_pdm_dev *to_info(struct snd_soc_dai *dai)
 71 {
 72         return snd_soc_dai_get_drvdata(dai);
 73 }
 74 
 75 static void rockchip_pdm_rxctrl(struct rk_pdm_dev *pdm, int on)
 76 {
 77         if (on) {
 78                 regmap_update_bits(pdm->regmap, PDM_DMA_CTRL,
 79                                    PDM_DMA_RD_MSK, PDM_DMA_RD_EN);
 80                 regmap_update_bits(pdm->regmap, PDM_SYSCONFIG,
 81                                    PDM_RX_MASK, PDM_RX_START);
 82         } else {
 83                 regmap_update_bits(pdm->regmap, PDM_DMA_CTRL,
 84                                    PDM_DMA_RD_MSK, PDM_DMA_RD_DIS);
 85                 regmap_update_bits(pdm->regmap, PDM_SYSCONFIG,
 86                                    PDM_RX_MASK | PDM_RX_CLR_MASK,
 87                                    PDM_RX_STOP | PDM_RX_CLR_WR);
 88         }
 89 }
 90 
 91 static int rockchip_pdm_hw_params(struct snd_pcm_substream *substream,
 92                                   struct snd_pcm_hw_params *params,
 93                                   struct snd_soc_dai *dai)
 94 {
 95         struct rk_pdm_dev *pdm = to_info(dai);
 96         unsigned int val = 0;
 97         unsigned int clk_rate, clk_div, samplerate;
 98         int ret;
 99 
100         samplerate = params_rate(params);
101         clk_rate = get_pdm_clk(samplerate);
102         if (!clk_rate)
103                 return -EINVAL;
104 
105         ret = clk_set_rate(pdm->clk, clk_rate);
106         if (ret)
107                 return -EINVAL;
108 
109         clk_div = DIV_ROUND_CLOSEST(clk_rate, samplerate);
110 
111         switch (clk_div) {
112         case 320:
113                 val = PDM_CLK_320FS;
114                 break;
115         case 640:
116                 val = PDM_CLK_640FS;
117                 break;
118         case 1280:
119                 val = PDM_CLK_1280FS;
120                 break;
121         case 2560:
122                 val = PDM_CLK_2560FS;
123                 break;
124         case 5120:
125                 val = PDM_CLK_5120FS;
126                 break;
127         default:
128                 dev_err(pdm->dev, "unsupported div: %d\n", clk_div);
129                 return -EINVAL;
130         }
131 
132         regmap_update_bits(pdm->regmap, PDM_CLK_CTRL, PDM_DS_RATIO_MSK, val);
133         regmap_update_bits(pdm->regmap, PDM_HPF_CTRL,
134                            PDM_HPF_CF_MSK, PDM_HPF_60HZ);
135         regmap_update_bits(pdm->regmap, PDM_HPF_CTRL,
136                            PDM_HPF_LE | PDM_HPF_RE, PDM_HPF_LE | PDM_HPF_RE);
137         regmap_update_bits(pdm->regmap, PDM_CLK_CTRL, PDM_CLK_EN, PDM_CLK_EN);
138 
139         val = 0;
140         switch (params_format(params)) {
141         case SNDRV_PCM_FORMAT_S8:
142                 val |= PDM_VDW(8);
143                 break;
144         case SNDRV_PCM_FORMAT_S16_LE:
145                 val |= PDM_VDW(16);
146                 break;
147         case SNDRV_PCM_FORMAT_S20_3LE:
148                 val |= PDM_VDW(20);
149                 break;
150         case SNDRV_PCM_FORMAT_S24_LE:
151                 val |= PDM_VDW(24);
152                 break;
153         case SNDRV_PCM_FORMAT_S32_LE:
154                 val |= PDM_VDW(32);
155                 break;
156         default:
157                 return -EINVAL;
158         }
159 
160         switch (params_channels(params)) {
161         case 8:
162                 val |= PDM_PATH3_EN;
163                 /* fallthrough */
164         case 6:
165                 val |= PDM_PATH2_EN;
166                 /* fallthrough */
167         case 4:
168                 val |= PDM_PATH1_EN;
169                 /* fallthrough */
170         case 2:
171                 val |= PDM_PATH0_EN;
172                 break;
173         default:
174                 dev_err(pdm->dev, "invalid channel: %d\n",
175                         params_channels(params));
176                 return -EINVAL;
177         }
178 
179         if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
180                 regmap_update_bits(pdm->regmap, PDM_CTRL0,
181                                    PDM_PATH_MSK | PDM_VDW_MSK,
182                                    val);
183                 regmap_update_bits(pdm->regmap, PDM_DMA_CTRL, PDM_DMA_RDL_MSK,
184                                    PDM_DMA_RDL(16));
185                 regmap_update_bits(pdm->regmap, PDM_SYSCONFIG,
186                                    PDM_RX_MASK | PDM_RX_CLR_MASK,
187                                    PDM_RX_STOP | PDM_RX_CLR_WR);
188         }
189 
190         return 0;
191 }
192 
193 static int rockchip_pdm_set_fmt(struct snd_soc_dai *cpu_dai,
194                                 unsigned int fmt)
195 {
196         struct rk_pdm_dev *pdm = to_info(cpu_dai);
197         unsigned int mask = 0, val = 0;
198 
199         mask = PDM_CKP_MSK;
200         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
201         case SND_SOC_DAIFMT_NB_NF:
202                 val = PDM_CKP_NORMAL;
203                 break;
204         case SND_SOC_DAIFMT_IB_NF:
205                 val = PDM_CKP_INVERTED;
206                 break;
207         default:
208                 return -EINVAL;
209         }
210 
211         regmap_update_bits(pdm->regmap, PDM_CLK_CTRL, mask, val);
212 
213         return 0;
214 }
215 
216 static int rockchip_pdm_trigger(struct snd_pcm_substream *substream, int cmd,
217                                 struct snd_soc_dai *dai)
218 {
219         struct rk_pdm_dev *pdm = to_info(dai);
220         int ret = 0;
221 
222         switch (cmd) {
223         case SNDRV_PCM_TRIGGER_START:
224         case SNDRV_PCM_TRIGGER_RESUME:
225         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
226                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
227                         rockchip_pdm_rxctrl(pdm, 1);
228                 break;
229         case SNDRV_PCM_TRIGGER_SUSPEND:
230         case SNDRV_PCM_TRIGGER_STOP:
231         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
232                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
233                         rockchip_pdm_rxctrl(pdm, 0);
234                 break;
235         default:
236                 ret = -EINVAL;
237                 break;
238         }
239 
240         return ret;
241 }
242 
243 static int rockchip_pdm_dai_probe(struct snd_soc_dai *dai)
244 {
245         struct rk_pdm_dev *pdm = to_info(dai);
246 
247         dai->capture_dma_data = &pdm->capture_dma_data;
248 
249         return 0;
250 }
251 
252 static struct snd_soc_dai_ops rockchip_pdm_dai_ops = {
253         .set_fmt = rockchip_pdm_set_fmt,
254         .trigger = rockchip_pdm_trigger,
255         .hw_params = rockchip_pdm_hw_params,
256 };
257 
258 #define ROCKCHIP_PDM_RATES SNDRV_PCM_RATE_8000_192000
259 #define ROCKCHIP_PDM_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | \
260                               SNDRV_PCM_FMTBIT_S20_3LE | \
261                               SNDRV_PCM_FMTBIT_S24_LE | \
262                               SNDRV_PCM_FMTBIT_S32_LE)
263 
264 static struct snd_soc_dai_driver rockchip_pdm_dai = {
265         .probe = rockchip_pdm_dai_probe,
266         .capture = {
267                 .stream_name = "Capture",
268                 .channels_min = 2,
269                 .channels_max = 8,
270                 .rates = ROCKCHIP_PDM_RATES,
271                 .formats = ROCKCHIP_PDM_FORMATS,
272         },
273         .ops = &rockchip_pdm_dai_ops,
274         .symmetric_rates = 1,
275 };
276 
277 static const struct snd_soc_component_driver rockchip_pdm_component = {
278         .name = "rockchip-pdm",
279 };
280 
281 static int rockchip_pdm_runtime_suspend(struct device *dev)
282 {
283         struct rk_pdm_dev *pdm = dev_get_drvdata(dev);
284 
285         clk_disable_unprepare(pdm->clk);
286         clk_disable_unprepare(pdm->hclk);
287 
288         return 0;
289 }
290 
291 static int rockchip_pdm_runtime_resume(struct device *dev)
292 {
293         struct rk_pdm_dev *pdm = dev_get_drvdata(dev);
294         int ret;
295 
296         ret = clk_prepare_enable(pdm->clk);
297         if (ret) {
298                 dev_err(pdm->dev, "clock enable failed %d\n", ret);
299                 return ret;
300         }
301 
302         ret = clk_prepare_enable(pdm->hclk);
303         if (ret) {
304                 dev_err(pdm->dev, "hclock enable failed %d\n", ret);
305                 return ret;
306         }
307 
308         return 0;
309 }
310 
311 static bool rockchip_pdm_wr_reg(struct device *dev, unsigned int reg)
312 {
313         switch (reg) {
314         case PDM_SYSCONFIG:
315         case PDM_CTRL0:
316         case PDM_CTRL1:
317         case PDM_CLK_CTRL:
318         case PDM_HPF_CTRL:
319         case PDM_FIFO_CTRL:
320         case PDM_DMA_CTRL:
321         case PDM_INT_EN:
322         case PDM_INT_CLR:
323         case PDM_DATA_VALID:
324                 return true;
325         default:
326                 return false;
327         }
328 }
329 
330 static bool rockchip_pdm_rd_reg(struct device *dev, unsigned int reg)
331 {
332         switch (reg) {
333         case PDM_SYSCONFIG:
334         case PDM_CTRL0:
335         case PDM_CTRL1:
336         case PDM_CLK_CTRL:
337         case PDM_HPF_CTRL:
338         case PDM_FIFO_CTRL:
339         case PDM_DMA_CTRL:
340         case PDM_INT_EN:
341         case PDM_INT_CLR:
342         case PDM_INT_ST:
343         case PDM_DATA_VALID:
344         case PDM_VERSION:
345                 return true;
346         default:
347                 return false;
348         }
349 }
350 
351 static bool rockchip_pdm_volatile_reg(struct device *dev, unsigned int reg)
352 {
353         switch (reg) {
354         case PDM_SYSCONFIG:
355         case PDM_INT_CLR:
356         case PDM_INT_ST:
357                 return true;
358         default:
359                 return false;
360         }
361 }
362 
363 static const struct regmap_config rockchip_pdm_regmap_config = {
364         .reg_bits = 32,
365         .reg_stride = 4,
366         .val_bits = 32,
367         .max_register = PDM_VERSION,
368         .writeable_reg = rockchip_pdm_wr_reg,
369         .readable_reg = rockchip_pdm_rd_reg,
370         .volatile_reg = rockchip_pdm_volatile_reg,
371         .cache_type = REGCACHE_FLAT,
372 };
373 
374 static int rockchip_pdm_probe(struct platform_device *pdev)
375 {
376         struct rk_pdm_dev *pdm;
377         struct resource *res;
378         void __iomem *regs;
379         int ret;
380 
381         pdm = devm_kzalloc(&pdev->dev, sizeof(*pdm), GFP_KERNEL);
382         if (!pdm)
383                 return -ENOMEM;
384 
385         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
386         regs = devm_ioremap_resource(&pdev->dev, res);
387         if (IS_ERR(regs))
388                 return PTR_ERR(regs);
389 
390         pdm->regmap = devm_regmap_init_mmio(&pdev->dev, regs,
391                                             &rockchip_pdm_regmap_config);
392         if (IS_ERR(pdm->regmap))
393                 return PTR_ERR(pdm->regmap);
394 
395         pdm->capture_dma_data.addr = res->start + PDM_RXFIFO_DATA;
396         pdm->capture_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
397         pdm->capture_dma_data.maxburst = PDM_DMA_BURST_SIZE;
398 
399         pdm->dev = &pdev->dev;
400         dev_set_drvdata(&pdev->dev, pdm);
401 
402         pdm->clk = devm_clk_get(&pdev->dev, "pdm_clk");
403         if (IS_ERR(pdm->clk))
404                 return PTR_ERR(pdm->clk);
405 
406         pdm->hclk = devm_clk_get(&pdev->dev, "pdm_hclk");
407         if (IS_ERR(pdm->hclk))
408                 return PTR_ERR(pdm->hclk);
409 
410         ret = clk_prepare_enable(pdm->hclk);
411         if (ret)
412                 return ret;
413 
414         pm_runtime_enable(&pdev->dev);
415         if (!pm_runtime_enabled(&pdev->dev)) {
416                 ret = rockchip_pdm_runtime_resume(&pdev->dev);
417                 if (ret)
418                         goto err_pm_disable;
419         }
420 
421         ret = devm_snd_soc_register_component(&pdev->dev,
422                                               &rockchip_pdm_component,
423                                               &rockchip_pdm_dai, 1);
424 
425         if (ret) {
426                 dev_err(&pdev->dev, "could not register dai: %d\n", ret);
427                 goto err_suspend;
428         }
429 
430         ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
431         if (ret) {
432                 dev_err(&pdev->dev, "could not register pcm: %d\n", ret);
433                 goto err_suspend;
434         }
435 
436         return 0;
437 
438 err_suspend:
439         if (!pm_runtime_status_suspended(&pdev->dev))
440                 rockchip_pdm_runtime_suspend(&pdev->dev);
441 err_pm_disable:
442         pm_runtime_disable(&pdev->dev);
443 
444         clk_disable_unprepare(pdm->hclk);
445 
446         return ret;
447 }
448 
449 static int rockchip_pdm_remove(struct platform_device *pdev)
450 {
451         struct rk_pdm_dev *pdm = dev_get_drvdata(&pdev->dev);
452 
453         pm_runtime_disable(&pdev->dev);
454         if (!pm_runtime_status_suspended(&pdev->dev))
455                 rockchip_pdm_runtime_suspend(&pdev->dev);
456 
457         clk_disable_unprepare(pdm->clk);
458         clk_disable_unprepare(pdm->hclk);
459 
460         return 0;
461 }
462 
463 #ifdef CONFIG_PM_SLEEP
464 static int rockchip_pdm_suspend(struct device *dev)
465 {
466         struct rk_pdm_dev *pdm = dev_get_drvdata(dev);
467 
468         regcache_mark_dirty(pdm->regmap);
469 
470         return 0;
471 }
472 
473 static int rockchip_pdm_resume(struct device *dev)
474 {
475         struct rk_pdm_dev *pdm = dev_get_drvdata(dev);
476         int ret;
477 
478         ret = pm_runtime_get_sync(dev);
479         if (ret < 0)
480                 return ret;
481 
482         ret = regcache_sync(pdm->regmap);
483 
484         pm_runtime_put(dev);
485 
486         return ret;
487 }
488 #endif
489 
490 static const struct dev_pm_ops rockchip_pdm_pm_ops = {
491         SET_RUNTIME_PM_OPS(rockchip_pdm_runtime_suspend,
492                            rockchip_pdm_runtime_resume, NULL)
493         SET_SYSTEM_SLEEP_PM_OPS(rockchip_pdm_suspend, rockchip_pdm_resume)
494 };
495 
496 static const struct of_device_id rockchip_pdm_match[] = {
497         { .compatible = "rockchip,pdm", },
498         {},
499 };
500 MODULE_DEVICE_TABLE(of, rockchip_pdm_match);
501 
502 static struct platform_driver rockchip_pdm_driver = {
503         .probe  = rockchip_pdm_probe,
504         .remove = rockchip_pdm_remove,
505         .driver = {
506                 .name = "rockchip-pdm",
507                 .of_match_table = of_match_ptr(rockchip_pdm_match),
508                 .pm = &rockchip_pdm_pm_ops,
509         },
510 };
511 
512 module_platform_driver(rockchip_pdm_driver);
513 
514 MODULE_AUTHOR("Sugar <sugar.zhang@rock-chips.com>");
515 MODULE_DESCRIPTION("Rockchip PDM Controller Driver");
516 MODULE_LICENSE("GPL v2");
517 

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