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Linux/sound/soc/samsung/spdif.c

  1 /* sound/soc/samsung/spdif.c
  2  *
  3  * ALSA SoC Audio Layer - Samsung S/PDIF Controller driver
  4  *
  5  * Copyright (c) 2010 Samsung Electronics Co. Ltd
  6  *              http://www.samsung.com/
  7  *
  8  * This program is free software; you can redistribute it and/or modify
  9  * it under the terms of the GNU General Public License version 2 as
 10  * published by the Free Software Foundation.
 11  */
 12 
 13 #include <linux/clk.h>
 14 #include <linux/io.h>
 15 #include <linux/module.h>
 16 
 17 #include <sound/soc.h>
 18 #include <sound/pcm_params.h>
 19 
 20 #include <linux/platform_data/asoc-s3c.h>
 21 
 22 #include "dma.h"
 23 #include "spdif.h"
 24 
 25 /* Registers */
 26 #define CLKCON                          0x00
 27 #define CON                             0x04
 28 #define BSTAS                           0x08
 29 #define CSTAS                           0x0C
 30 #define DATA_OUTBUF                     0x10
 31 #define DCNT                            0x14
 32 #define BSTAS_S                         0x18
 33 #define DCNT_S                          0x1C
 34 
 35 #define CLKCTL_MASK                     0x7
 36 #define CLKCTL_MCLK_EXT                 (0x1 << 2)
 37 #define CLKCTL_PWR_ON                   (0x1 << 0)
 38 
 39 #define CON_MASK                        0x3ffffff
 40 #define CON_FIFO_TH_SHIFT               19
 41 #define CON_FIFO_TH_MASK                (0x7 << 19)
 42 #define CON_USERDATA_23RDBIT            (0x1 << 12)
 43 
 44 #define CON_SW_RESET                    (0x1 << 5)
 45 
 46 #define CON_MCLKDIV_MASK                (0x3 << 3)
 47 #define CON_MCLKDIV_256FS               (0x0 << 3)
 48 #define CON_MCLKDIV_384FS               (0x1 << 3)
 49 #define CON_MCLKDIV_512FS               (0x2 << 3)
 50 
 51 #define CON_PCM_MASK                    (0x3 << 1)
 52 #define CON_PCM_16BIT                   (0x0 << 1)
 53 #define CON_PCM_20BIT                   (0x1 << 1)
 54 #define CON_PCM_24BIT                   (0x2 << 1)
 55 
 56 #define CON_PCM_DATA                    (0x1 << 0)
 57 
 58 #define CSTAS_MASK                      0x3fffffff
 59 #define CSTAS_SAMP_FREQ_MASK            (0xF << 24)
 60 #define CSTAS_SAMP_FREQ_44              (0x0 << 24)
 61 #define CSTAS_SAMP_FREQ_48              (0x2 << 24)
 62 #define CSTAS_SAMP_FREQ_32              (0x3 << 24)
 63 #define CSTAS_SAMP_FREQ_96              (0xA << 24)
 64 
 65 #define CSTAS_CATEGORY_MASK             (0xFF << 8)
 66 #define CSTAS_CATEGORY_CODE_CDP         (0x01 << 8)
 67 
 68 #define CSTAS_NO_COPYRIGHT              (0x1 << 2)
 69 
 70 /**
 71  * struct samsung_spdif_info - Samsung S/PDIF Controller information
 72  * @lock: Spin lock for S/PDIF.
 73  * @dev: The parent device passed to use from the probe.
 74  * @regs: The pointer to the device register block.
 75  * @clk_rate: Current clock rate for calcurate ratio.
 76  * @pclk: The peri-clock pointer for spdif master operation.
 77  * @sclk: The source clock pointer for making sync signals.
 78  * @save_clkcon: Backup clkcon reg. in suspend.
 79  * @save_con: Backup con reg. in suspend.
 80  * @save_cstas: Backup cstas reg. in suspend.
 81  * @dma_playback: DMA information for playback channel.
 82  */
 83 struct samsung_spdif_info {
 84         spinlock_t      lock;
 85         struct device   *dev;
 86         void __iomem    *regs;
 87         unsigned long   clk_rate;
 88         struct clk      *pclk;
 89         struct clk      *sclk;
 90         u32             saved_clkcon;
 91         u32             saved_con;
 92         u32             saved_cstas;
 93         struct s3c_dma_params   *dma_playback;
 94 };
 95 
 96 static struct s3c_dma_client spdif_dma_client_out = {
 97         .name           = "S/PDIF Stereo out",
 98 };
 99 
100 static struct s3c_dma_params spdif_stereo_out;
101 static struct samsung_spdif_info spdif_info;
102 
103 static inline struct samsung_spdif_info *to_info(struct snd_soc_dai *cpu_dai)
104 {
105         return snd_soc_dai_get_drvdata(cpu_dai);
106 }
107 
108 static void spdif_snd_txctrl(struct samsung_spdif_info *spdif, int on)
109 {
110         void __iomem *regs = spdif->regs;
111         u32 clkcon;
112 
113         dev_dbg(spdif->dev, "Entered %s\n", __func__);
114 
115         clkcon = readl(regs + CLKCON) & CLKCTL_MASK;
116         if (on)
117                 writel(clkcon | CLKCTL_PWR_ON, regs + CLKCON);
118         else
119                 writel(clkcon & ~CLKCTL_PWR_ON, regs + CLKCON);
120 }
121 
122 static int spdif_set_sysclk(struct snd_soc_dai *cpu_dai,
123                                 int clk_id, unsigned int freq, int dir)
124 {
125         struct samsung_spdif_info *spdif = to_info(cpu_dai);
126         u32 clkcon;
127 
128         dev_dbg(spdif->dev, "Entered %s\n", __func__);
129 
130         clkcon = readl(spdif->regs + CLKCON);
131 
132         if (clk_id == SND_SOC_SPDIF_INT_MCLK)
133                 clkcon &= ~CLKCTL_MCLK_EXT;
134         else
135                 clkcon |= CLKCTL_MCLK_EXT;
136 
137         writel(clkcon, spdif->regs + CLKCON);
138 
139         spdif->clk_rate = freq;
140 
141         return 0;
142 }
143 
144 static int spdif_trigger(struct snd_pcm_substream *substream, int cmd,
145                                 struct snd_soc_dai *dai)
146 {
147         struct snd_soc_pcm_runtime *rtd = substream->private_data;
148         struct samsung_spdif_info *spdif = to_info(rtd->cpu_dai);
149         unsigned long flags;
150 
151         dev_dbg(spdif->dev, "Entered %s\n", __func__);
152 
153         switch (cmd) {
154         case SNDRV_PCM_TRIGGER_START:
155         case SNDRV_PCM_TRIGGER_RESUME:
156         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
157                 spin_lock_irqsave(&spdif->lock, flags);
158                 spdif_snd_txctrl(spdif, 1);
159                 spin_unlock_irqrestore(&spdif->lock, flags);
160                 break;
161         case SNDRV_PCM_TRIGGER_STOP:
162         case SNDRV_PCM_TRIGGER_SUSPEND:
163         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
164                 spin_lock_irqsave(&spdif->lock, flags);
165                 spdif_snd_txctrl(spdif, 0);
166                 spin_unlock_irqrestore(&spdif->lock, flags);
167                 break;
168         default:
169                 return -EINVAL;
170         }
171 
172         return 0;
173 }
174 
175 static int spdif_sysclk_ratios[] = {
176         512, 384, 256,
177 };
178 
179 static int spdif_hw_params(struct snd_pcm_substream *substream,
180                                 struct snd_pcm_hw_params *params,
181                                 struct snd_soc_dai *socdai)
182 {
183         struct snd_soc_pcm_runtime *rtd = substream->private_data;
184         struct samsung_spdif_info *spdif = to_info(rtd->cpu_dai);
185         void __iomem *regs = spdif->regs;
186         struct s3c_dma_params *dma_data;
187         u32 con, clkcon, cstas;
188         unsigned long flags;
189         int i, ratio;
190 
191         dev_dbg(spdif->dev, "Entered %s\n", __func__);
192 
193         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
194                 dma_data = spdif->dma_playback;
195         else {
196                 dev_err(spdif->dev, "Capture is not supported\n");
197                 return -EINVAL;
198         }
199 
200         snd_soc_dai_set_dma_data(rtd->cpu_dai, substream, dma_data);
201 
202         spin_lock_irqsave(&spdif->lock, flags);
203 
204         con = readl(regs + CON) & CON_MASK;
205         cstas = readl(regs + CSTAS) & CSTAS_MASK;
206         clkcon = readl(regs + CLKCON) & CLKCTL_MASK;
207 
208         con &= ~CON_FIFO_TH_MASK;
209         con |= (0x7 << CON_FIFO_TH_SHIFT);
210         con |= CON_USERDATA_23RDBIT;
211         con |= CON_PCM_DATA;
212 
213         con &= ~CON_PCM_MASK;
214         switch (params_format(params)) {
215         case SNDRV_PCM_FORMAT_S16_LE:
216                 con |= CON_PCM_16BIT;
217                 break;
218         default:
219                 dev_err(spdif->dev, "Unsupported data size.\n");
220                 goto err;
221         }
222 
223         ratio = spdif->clk_rate / params_rate(params);
224         for (i = 0; i < ARRAY_SIZE(spdif_sysclk_ratios); i++)
225                 if (ratio == spdif_sysclk_ratios[i])
226                         break;
227         if (i == ARRAY_SIZE(spdif_sysclk_ratios)) {
228                 dev_err(spdif->dev, "Invalid clock ratio %ld/%d\n",
229                                 spdif->clk_rate, params_rate(params));
230                 goto err;
231         }
232 
233         con &= ~CON_MCLKDIV_MASK;
234         switch (ratio) {
235         case 256:
236                 con |= CON_MCLKDIV_256FS;
237                 break;
238         case 384:
239                 con |= CON_MCLKDIV_384FS;
240                 break;
241         case 512:
242                 con |= CON_MCLKDIV_512FS;
243                 break;
244         }
245 
246         cstas &= ~CSTAS_SAMP_FREQ_MASK;
247         switch (params_rate(params)) {
248         case 44100:
249                 cstas |= CSTAS_SAMP_FREQ_44;
250                 break;
251         case 48000:
252                 cstas |= CSTAS_SAMP_FREQ_48;
253                 break;
254         case 32000:
255                 cstas |= CSTAS_SAMP_FREQ_32;
256                 break;
257         case 96000:
258                 cstas |= CSTAS_SAMP_FREQ_96;
259                 break;
260         default:
261                 dev_err(spdif->dev, "Invalid sampling rate %d\n",
262                                 params_rate(params));
263                 goto err;
264         }
265 
266         cstas &= ~CSTAS_CATEGORY_MASK;
267         cstas |= CSTAS_CATEGORY_CODE_CDP;
268         cstas |= CSTAS_NO_COPYRIGHT;
269 
270         writel(con, regs + CON);
271         writel(cstas, regs + CSTAS);
272         writel(clkcon, regs + CLKCON);
273 
274         spin_unlock_irqrestore(&spdif->lock, flags);
275 
276         return 0;
277 err:
278         spin_unlock_irqrestore(&spdif->lock, flags);
279         return -EINVAL;
280 }
281 
282 static void spdif_shutdown(struct snd_pcm_substream *substream,
283                                 struct snd_soc_dai *dai)
284 {
285         struct snd_soc_pcm_runtime *rtd = substream->private_data;
286         struct samsung_spdif_info *spdif = to_info(rtd->cpu_dai);
287         void __iomem *regs = spdif->regs;
288         u32 con, clkcon;
289 
290         dev_dbg(spdif->dev, "Entered %s\n", __func__);
291 
292         con = readl(regs + CON) & CON_MASK;
293         clkcon = readl(regs + CLKCON) & CLKCTL_MASK;
294 
295         writel(con | CON_SW_RESET, regs + CON);
296         cpu_relax();
297 
298         writel(clkcon & ~CLKCTL_PWR_ON, regs + CLKCON);
299 }
300 
301 #ifdef CONFIG_PM
302 static int spdif_suspend(struct snd_soc_dai *cpu_dai)
303 {
304         struct samsung_spdif_info *spdif = to_info(cpu_dai);
305         u32 con = spdif->saved_con;
306 
307         dev_dbg(spdif->dev, "Entered %s\n", __func__);
308 
309         spdif->saved_clkcon = readl(spdif->regs + CLKCON) & CLKCTL_MASK;
310         spdif->saved_con = readl(spdif->regs + CON) & CON_MASK;
311         spdif->saved_cstas = readl(spdif->regs + CSTAS) & CSTAS_MASK;
312 
313         writel(con | CON_SW_RESET, spdif->regs + CON);
314         cpu_relax();
315 
316         return 0;
317 }
318 
319 static int spdif_resume(struct snd_soc_dai *cpu_dai)
320 {
321         struct samsung_spdif_info *spdif = to_info(cpu_dai);
322 
323         dev_dbg(spdif->dev, "Entered %s\n", __func__);
324 
325         writel(spdif->saved_clkcon, spdif->regs + CLKCON);
326         writel(spdif->saved_con, spdif->regs + CON);
327         writel(spdif->saved_cstas, spdif->regs + CSTAS);
328 
329         return 0;
330 }
331 #else
332 #define spdif_suspend NULL
333 #define spdif_resume NULL
334 #endif
335 
336 static const struct snd_soc_dai_ops spdif_dai_ops = {
337         .set_sysclk     = spdif_set_sysclk,
338         .trigger        = spdif_trigger,
339         .hw_params      = spdif_hw_params,
340         .shutdown       = spdif_shutdown,
341 };
342 
343 static struct snd_soc_dai_driver samsung_spdif_dai = {
344         .name = "samsung-spdif",
345         .playback = {
346                 .stream_name = "S/PDIF Playback",
347                 .channels_min = 2,
348                 .channels_max = 2,
349                 .rates = (SNDRV_PCM_RATE_32000 |
350                                 SNDRV_PCM_RATE_44100 |
351                                 SNDRV_PCM_RATE_48000 |
352                                 SNDRV_PCM_RATE_96000),
353                 .formats = SNDRV_PCM_FMTBIT_S16_LE, },
354         .ops = &spdif_dai_ops,
355         .suspend = spdif_suspend,
356         .resume = spdif_resume,
357 };
358 
359 static const struct snd_soc_component_driver samsung_spdif_component = {
360         .name           = "samsung-spdif",
361 };
362 
363 static int spdif_probe(struct platform_device *pdev)
364 {
365         struct s3c_audio_pdata *spdif_pdata;
366         struct resource *mem_res, *dma_res;
367         struct samsung_spdif_info *spdif;
368         int ret;
369 
370         spdif_pdata = pdev->dev.platform_data;
371 
372         dev_dbg(&pdev->dev, "Entered %s\n", __func__);
373 
374         dma_res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
375         if (!dma_res) {
376                 dev_err(&pdev->dev, "Unable to get dma resource.\n");
377                 return -ENXIO;
378         }
379 
380         mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
381         if (!mem_res) {
382                 dev_err(&pdev->dev, "Unable to get register resource.\n");
383                 return -ENXIO;
384         }
385 
386         if (spdif_pdata && spdif_pdata->cfg_gpio
387                         && spdif_pdata->cfg_gpio(pdev)) {
388                 dev_err(&pdev->dev, "Unable to configure GPIO pins\n");
389                 return -EINVAL;
390         }
391 
392         spdif = &spdif_info;
393         spdif->dev = &pdev->dev;
394 
395         spin_lock_init(&spdif->lock);
396 
397         spdif->pclk = devm_clk_get(&pdev->dev, "spdif");
398         if (IS_ERR(spdif->pclk)) {
399                 dev_err(&pdev->dev, "failed to get peri-clock\n");
400                 ret = -ENOENT;
401                 goto err0;
402         }
403         clk_prepare_enable(spdif->pclk);
404 
405         spdif->sclk = devm_clk_get(&pdev->dev, "sclk_spdif");
406         if (IS_ERR(spdif->sclk)) {
407                 dev_err(&pdev->dev, "failed to get internal source clock\n");
408                 ret = -ENOENT;
409                 goto err1;
410         }
411         clk_prepare_enable(spdif->sclk);
412 
413         /* Request S/PDIF Register's memory region */
414         if (!request_mem_region(mem_res->start,
415                                 resource_size(mem_res), "samsung-spdif")) {
416                 dev_err(&pdev->dev, "Unable to request register region\n");
417                 ret = -EBUSY;
418                 goto err2;
419         }
420 
421         spdif->regs = ioremap(mem_res->start, 0x100);
422         if (spdif->regs == NULL) {
423                 dev_err(&pdev->dev, "Cannot ioremap registers\n");
424                 ret = -ENXIO;
425                 goto err3;
426         }
427 
428         dev_set_drvdata(&pdev->dev, spdif);
429 
430         ret = snd_soc_register_component(&pdev->dev, &samsung_spdif_component,
431                                          &samsung_spdif_dai, 1);
432         if (ret != 0) {
433                 dev_err(&pdev->dev, "fail to register dai\n");
434                 goto err4;
435         }
436 
437         spdif_stereo_out.dma_size = 2;
438         spdif_stereo_out.client = &spdif_dma_client_out;
439         spdif_stereo_out.dma_addr = mem_res->start + DATA_OUTBUF;
440         spdif_stereo_out.channel = dma_res->start;
441 
442         spdif->dma_playback = &spdif_stereo_out;
443 
444         ret = samsung_asoc_dma_platform_register(&pdev->dev);
445         if (ret) {
446                 dev_err(&pdev->dev, "failed to register DMA: %d\n", ret);
447                 goto err5;
448         }
449 
450         return 0;
451 err5:
452         snd_soc_unregister_component(&pdev->dev);
453 err4:
454         iounmap(spdif->regs);
455 err3:
456         release_mem_region(mem_res->start, resource_size(mem_res));
457 err2:
458         clk_disable_unprepare(spdif->sclk);
459 err1:
460         clk_disable_unprepare(spdif->pclk);
461 err0:
462         return ret;
463 }
464 
465 static int spdif_remove(struct platform_device *pdev)
466 {
467         struct samsung_spdif_info *spdif = &spdif_info;
468         struct resource *mem_res;
469 
470         samsung_asoc_dma_platform_unregister(&pdev->dev);
471         snd_soc_unregister_component(&pdev->dev);
472 
473         iounmap(spdif->regs);
474 
475         mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
476         if (mem_res)
477                 release_mem_region(mem_res->start, resource_size(mem_res));
478 
479         clk_disable_unprepare(spdif->sclk);
480         clk_disable_unprepare(spdif->pclk);
481 
482         return 0;
483 }
484 
485 static struct platform_driver samsung_spdif_driver = {
486         .probe  = spdif_probe,
487         .remove = spdif_remove,
488         .driver = {
489                 .name   = "samsung-spdif",
490                 .owner  = THIS_MODULE,
491         },
492 };
493 
494 module_platform_driver(samsung_spdif_driver);
495 
496 MODULE_AUTHOR("Seungwhan Youn, <sw.youn@samsung.com>");
497 MODULE_DESCRIPTION("Samsung S/PDIF Controller Driver");
498 MODULE_LICENSE("GPL");
499 MODULE_ALIAS("platform:samsung-spdif");
500 

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