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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 #include <mach/dma.h>
 22 
 23 #include "dma.h"
 24 #include "spdif.h"
 25 
 26 /* Registers */
 27 #define CLKCON                          0x00
 28 #define CON                             0x04
 29 #define BSTAS                           0x08
 30 #define CSTAS                           0x0C
 31 #define DATA_OUTBUF                     0x10
 32 #define DCNT                            0x14
 33 #define BSTAS_S                         0x18
 34 #define DCNT_S                          0x1C
 35 
 36 #define CLKCTL_MASK                     0x7
 37 #define CLKCTL_MCLK_EXT                 (0x1 << 2)
 38 #define CLKCTL_PWR_ON                   (0x1 << 0)
 39 
 40 #define CON_MASK                        0x3ffffff
 41 #define CON_FIFO_TH_SHIFT               19
 42 #define CON_FIFO_TH_MASK                (0x7 << 19)
 43 #define CON_USERDATA_23RDBIT            (0x1 << 12)
 44 
 45 #define CON_SW_RESET                    (0x1 << 5)
 46 
 47 #define CON_MCLKDIV_MASK                (0x3 << 3)
 48 #define CON_MCLKDIV_256FS               (0x0 << 3)
 49 #define CON_MCLKDIV_384FS               (0x1 << 3)
 50 #define CON_MCLKDIV_512FS               (0x2 << 3)
 51 
 52 #define CON_PCM_MASK                    (0x3 << 1)
 53 #define CON_PCM_16BIT                   (0x0 << 1)
 54 #define CON_PCM_20BIT                   (0x1 << 1)
 55 #define CON_PCM_24BIT                   (0x2 << 1)
 56 
 57 #define CON_PCM_DATA                    (0x1 << 0)
 58 
 59 #define CSTAS_MASK                      0x3fffffff
 60 #define CSTAS_SAMP_FREQ_MASK            (0xF << 24)
 61 #define CSTAS_SAMP_FREQ_44              (0x0 << 24)
 62 #define CSTAS_SAMP_FREQ_48              (0x2 << 24)
 63 #define CSTAS_SAMP_FREQ_32              (0x3 << 24)
 64 #define CSTAS_SAMP_FREQ_96              (0xA << 24)
 65 
 66 #define CSTAS_CATEGORY_MASK             (0xFF << 8)
 67 #define CSTAS_CATEGORY_CODE_CDP         (0x01 << 8)
 68 
 69 #define CSTAS_NO_COPYRIGHT              (0x1 << 2)
 70 
 71 /**
 72  * struct samsung_spdif_info - Samsung S/PDIF Controller information
 73  * @lock: Spin lock for S/PDIF.
 74  * @dev: The parent device passed to use from the probe.
 75  * @regs: The pointer to the device register block.
 76  * @clk_rate: Current clock rate for calcurate ratio.
 77  * @pclk: The peri-clock pointer for spdif master operation.
 78  * @sclk: The source clock pointer for making sync signals.
 79  * @save_clkcon: Backup clkcon reg. in suspend.
 80  * @save_con: Backup con reg. in suspend.
 81  * @save_cstas: Backup cstas reg. in suspend.
 82  * @dma_playback: DMA information for playback channel.
 83  */
 84 struct samsung_spdif_info {
 85         spinlock_t      lock;
 86         struct device   *dev;
 87         void __iomem    *regs;
 88         unsigned long   clk_rate;
 89         struct clk      *pclk;
 90         struct clk      *sclk;
 91         u32             saved_clkcon;
 92         u32             saved_con;
 93         u32             saved_cstas;
 94         struct s3c_dma_params   *dma_playback;
 95 };
 96 
 97 static struct s3c2410_dma_client spdif_dma_client_out = {
 98         .name           = "S/PDIF Stereo out",
 99 };
100 
101 static struct s3c_dma_params spdif_stereo_out;
102 static struct samsung_spdif_info spdif_info;
103 
104 static inline struct samsung_spdif_info *to_info(struct snd_soc_dai *cpu_dai)
105 {
106         return snd_soc_dai_get_drvdata(cpu_dai);
107 }
108 
109 static void spdif_snd_txctrl(struct samsung_spdif_info *spdif, int on)
110 {
111         void __iomem *regs = spdif->regs;
112         u32 clkcon;
113 
114         dev_dbg(spdif->dev, "Entered %s\n", __func__);
115 
116         clkcon = readl(regs + CLKCON) & CLKCTL_MASK;
117         if (on)
118                 writel(clkcon | CLKCTL_PWR_ON, regs + CLKCON);
119         else
120                 writel(clkcon & ~CLKCTL_PWR_ON, regs + CLKCON);
121 }
122 
123 static int spdif_set_sysclk(struct snd_soc_dai *cpu_dai,
124                                 int clk_id, unsigned int freq, int dir)
125 {
126         struct samsung_spdif_info *spdif = to_info(cpu_dai);
127         u32 clkcon;
128 
129         dev_dbg(spdif->dev, "Entered %s\n", __func__);
130 
131         clkcon = readl(spdif->regs + CLKCON);
132 
133         if (clk_id == SND_SOC_SPDIF_INT_MCLK)
134                 clkcon &= ~CLKCTL_MCLK_EXT;
135         else
136                 clkcon |= CLKCTL_MCLK_EXT;
137 
138         writel(clkcon, spdif->regs + CLKCON);
139 
140         spdif->clk_rate = freq;
141 
142         return 0;
143 }
144 
145 static int spdif_trigger(struct snd_pcm_substream *substream, int cmd,
146                                 struct snd_soc_dai *dai)
147 {
148         struct snd_soc_pcm_runtime *rtd = substream->private_data;
149         struct samsung_spdif_info *spdif = to_info(rtd->cpu_dai);
150         unsigned long flags;
151 
152         dev_dbg(spdif->dev, "Entered %s\n", __func__);
153 
154         switch (cmd) {
155         case SNDRV_PCM_TRIGGER_START:
156         case SNDRV_PCM_TRIGGER_RESUME:
157         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
158                 spin_lock_irqsave(&spdif->lock, flags);
159                 spdif_snd_txctrl(spdif, 1);
160                 spin_unlock_irqrestore(&spdif->lock, flags);
161                 break;
162         case SNDRV_PCM_TRIGGER_STOP:
163         case SNDRV_PCM_TRIGGER_SUSPEND:
164         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
165                 spin_lock_irqsave(&spdif->lock, flags);
166                 spdif_snd_txctrl(spdif, 0);
167                 spin_unlock_irqrestore(&spdif->lock, flags);
168                 break;
169         default:
170                 return -EINVAL;
171         }
172 
173         return 0;
174 }
175 
176 static int spdif_sysclk_ratios[] = {
177         512, 384, 256,
178 };
179 
180 static int spdif_hw_params(struct snd_pcm_substream *substream,
181                                 struct snd_pcm_hw_params *params,
182                                 struct snd_soc_dai *socdai)
183 {
184         struct snd_soc_pcm_runtime *rtd = substream->private_data;
185         struct samsung_spdif_info *spdif = to_info(rtd->cpu_dai);
186         void __iomem *regs = spdif->regs;
187         struct s3c_dma_params *dma_data;
188         u32 con, clkcon, cstas;
189         unsigned long flags;
190         int i, ratio;
191 
192         dev_dbg(spdif->dev, "Entered %s\n", __func__);
193 
194         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
195                 dma_data = spdif->dma_playback;
196         else {
197                 dev_err(spdif->dev, "Capture is not supported\n");
198                 return -EINVAL;
199         }
200 
201         snd_soc_dai_set_dma_data(rtd->cpu_dai, substream, dma_data);
202 
203         spin_lock_irqsave(&spdif->lock, flags);
204 
205         con = readl(regs + CON) & CON_MASK;
206         cstas = readl(regs + CSTAS) & CSTAS_MASK;
207         clkcon = readl(regs + CLKCON) & CLKCTL_MASK;
208 
209         con &= ~CON_FIFO_TH_MASK;
210         con |= (0x7 << CON_FIFO_TH_SHIFT);
211         con |= CON_USERDATA_23RDBIT;
212         con |= CON_PCM_DATA;
213 
214         con &= ~CON_PCM_MASK;
215         switch (params_format(params)) {
216         case SNDRV_PCM_FORMAT_S16_LE:
217                 con |= CON_PCM_16BIT;
218                 break;
219         default:
220                 dev_err(spdif->dev, "Unsupported data size.\n");
221                 goto err;
222         }
223 
224         ratio = spdif->clk_rate / params_rate(params);
225         for (i = 0; i < ARRAY_SIZE(spdif_sysclk_ratios); i++)
226                 if (ratio == spdif_sysclk_ratios[i])
227                         break;
228         if (i == ARRAY_SIZE(spdif_sysclk_ratios)) {
229                 dev_err(spdif->dev, "Invalid clock ratio %ld/%d\n",
230                                 spdif->clk_rate, params_rate(params));
231                 goto err;
232         }
233 
234         con &= ~CON_MCLKDIV_MASK;
235         switch (ratio) {
236         case 256:
237                 con |= CON_MCLKDIV_256FS;
238                 break;
239         case 384:
240                 con |= CON_MCLKDIV_384FS;
241                 break;
242         case 512:
243                 con |= CON_MCLKDIV_512FS;
244                 break;
245         }
246 
247         cstas &= ~CSTAS_SAMP_FREQ_MASK;
248         switch (params_rate(params)) {
249         case 44100:
250                 cstas |= CSTAS_SAMP_FREQ_44;
251                 break;
252         case 48000:
253                 cstas |= CSTAS_SAMP_FREQ_48;
254                 break;
255         case 32000:
256                 cstas |= CSTAS_SAMP_FREQ_32;
257                 break;
258         case 96000:
259                 cstas |= CSTAS_SAMP_FREQ_96;
260                 break;
261         default:
262                 dev_err(spdif->dev, "Invalid sampling rate %d\n",
263                                 params_rate(params));
264                 goto err;
265         }
266 
267         cstas &= ~CSTAS_CATEGORY_MASK;
268         cstas |= CSTAS_CATEGORY_CODE_CDP;
269         cstas |= CSTAS_NO_COPYRIGHT;
270 
271         writel(con, regs + CON);
272         writel(cstas, regs + CSTAS);
273         writel(clkcon, regs + CLKCON);
274 
275         spin_unlock_irqrestore(&spdif->lock, flags);
276 
277         return 0;
278 err:
279         spin_unlock_irqrestore(&spdif->lock, flags);
280         return -EINVAL;
281 }
282 
283 static void spdif_shutdown(struct snd_pcm_substream *substream,
284                                 struct snd_soc_dai *dai)
285 {
286         struct snd_soc_pcm_runtime *rtd = substream->private_data;
287         struct samsung_spdif_info *spdif = to_info(rtd->cpu_dai);
288         void __iomem *regs = spdif->regs;
289         u32 con, clkcon;
290 
291         dev_dbg(spdif->dev, "Entered %s\n", __func__);
292 
293         con = readl(regs + CON) & CON_MASK;
294         clkcon = readl(regs + CLKCON) & CLKCTL_MASK;
295 
296         writel(con | CON_SW_RESET, regs + CON);
297         cpu_relax();
298 
299         writel(clkcon & ~CLKCTL_PWR_ON, regs + CLKCON);
300 }
301 
302 #ifdef CONFIG_PM
303 static int spdif_suspend(struct snd_soc_dai *cpu_dai)
304 {
305         struct samsung_spdif_info *spdif = to_info(cpu_dai);
306         u32 con = spdif->saved_con;
307 
308         dev_dbg(spdif->dev, "Entered %s\n", __func__);
309 
310         spdif->saved_clkcon = readl(spdif->regs + CLKCON) & CLKCTL_MASK;
311         spdif->saved_con = readl(spdif->regs + CON) & CON_MASK;
312         spdif->saved_cstas = readl(spdif->regs + CSTAS) & CSTAS_MASK;
313 
314         writel(con | CON_SW_RESET, spdif->regs + CON);
315         cpu_relax();
316 
317         return 0;
318 }
319 
320 static int spdif_resume(struct snd_soc_dai *cpu_dai)
321 {
322         struct samsung_spdif_info *spdif = to_info(cpu_dai);
323 
324         dev_dbg(spdif->dev, "Entered %s\n", __func__);
325 
326         writel(spdif->saved_clkcon, spdif->regs + CLKCON);
327         writel(spdif->saved_con, spdif->regs + CON);
328         writel(spdif->saved_cstas, spdif->regs + CSTAS);
329 
330         return 0;
331 }
332 #else
333 #define spdif_suspend NULL
334 #define spdif_resume NULL
335 #endif
336 
337 static const struct snd_soc_dai_ops spdif_dai_ops = {
338         .set_sysclk     = spdif_set_sysclk,
339         .trigger        = spdif_trigger,
340         .hw_params      = spdif_hw_params,
341         .shutdown       = spdif_shutdown,
342 };
343 
344 static struct snd_soc_dai_driver samsung_spdif_dai = {
345         .name = "samsung-spdif",
346         .playback = {
347                 .stream_name = "S/PDIF Playback",
348                 .channels_min = 2,
349                 .channels_max = 2,
350                 .rates = (SNDRV_PCM_RATE_32000 |
351                                 SNDRV_PCM_RATE_44100 |
352                                 SNDRV_PCM_RATE_48000 |
353                                 SNDRV_PCM_RATE_96000),
354                 .formats = SNDRV_PCM_FMTBIT_S16_LE, },
355         .ops = &spdif_dai_ops,
356         .suspend = spdif_suspend,
357         .resume = spdif_resume,
358 };
359 
360 static const struct snd_soc_component_driver samsung_spdif_component = {
361         .name           = "samsung-spdif",
362 };
363 
364 static int spdif_probe(struct platform_device *pdev)
365 {
366         struct s3c_audio_pdata *spdif_pdata;
367         struct resource *mem_res, *dma_res;
368         struct samsung_spdif_info *spdif;
369         int ret;
370 
371         spdif_pdata = pdev->dev.platform_data;
372 
373         dev_dbg(&pdev->dev, "Entered %s\n", __func__);
374 
375         dma_res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
376         if (!dma_res) {
377                 dev_err(&pdev->dev, "Unable to get dma resource.\n");
378                 return -ENXIO;
379         }
380 
381         mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
382         if (!mem_res) {
383                 dev_err(&pdev->dev, "Unable to get register resource.\n");
384                 return -ENXIO;
385         }
386 
387         if (spdif_pdata && spdif_pdata->cfg_gpio
388                         && spdif_pdata->cfg_gpio(pdev)) {
389                 dev_err(&pdev->dev, "Unable to configure GPIO pins\n");
390                 return -EINVAL;
391         }
392 
393         spdif = &spdif_info;
394         spdif->dev = &pdev->dev;
395 
396         spin_lock_init(&spdif->lock);
397 
398         spdif->pclk = devm_clk_get(&pdev->dev, "spdif");
399         if (IS_ERR(spdif->pclk)) {
400                 dev_err(&pdev->dev, "failed to get peri-clock\n");
401                 ret = -ENOENT;
402                 goto err0;
403         }
404         clk_prepare_enable(spdif->pclk);
405 
406         spdif->sclk = devm_clk_get(&pdev->dev, "sclk_spdif");
407         if (IS_ERR(spdif->sclk)) {
408                 dev_err(&pdev->dev, "failed to get internal source clock\n");
409                 ret = -ENOENT;
410                 goto err1;
411         }
412         clk_prepare_enable(spdif->sclk);
413 
414         /* Request S/PDIF Register's memory region */
415         if (!request_mem_region(mem_res->start,
416                                 resource_size(mem_res), "samsung-spdif")) {
417                 dev_err(&pdev->dev, "Unable to request register region\n");
418                 ret = -EBUSY;
419                 goto err2;
420         }
421 
422         spdif->regs = ioremap(mem_res->start, 0x100);
423         if (spdif->regs == NULL) {
424                 dev_err(&pdev->dev, "Cannot ioremap registers\n");
425                 ret = -ENXIO;
426                 goto err3;
427         }
428 
429         dev_set_drvdata(&pdev->dev, spdif);
430 
431         ret = snd_soc_register_component(&pdev->dev, &samsung_spdif_component,
432                                          &samsung_spdif_dai, 1);
433         if (ret != 0) {
434                 dev_err(&pdev->dev, "fail to register dai\n");
435                 goto err4;
436         }
437 
438         spdif_stereo_out.dma_size = 2;
439         spdif_stereo_out.client = &spdif_dma_client_out;
440         spdif_stereo_out.dma_addr = mem_res->start + DATA_OUTBUF;
441         spdif_stereo_out.channel = dma_res->start;
442 
443         spdif->dma_playback = &spdif_stereo_out;
444 
445         ret = samsung_asoc_dma_platform_register(&pdev->dev);
446         if (ret) {
447                 dev_err(&pdev->dev, "failed to register DMA: %d\n", ret);
448                 goto err5;
449         }
450 
451         return 0;
452 err5:
453         snd_soc_unregister_component(&pdev->dev);
454 err4:
455         iounmap(spdif->regs);
456 err3:
457         release_mem_region(mem_res->start, resource_size(mem_res));
458 err2:
459         clk_disable_unprepare(spdif->sclk);
460 err1:
461         clk_disable_unprepare(spdif->pclk);
462 err0:
463         return ret;
464 }
465 
466 static int spdif_remove(struct platform_device *pdev)
467 {
468         struct samsung_spdif_info *spdif = &spdif_info;
469         struct resource *mem_res;
470 
471         samsung_asoc_dma_platform_unregister(&pdev->dev);
472         snd_soc_unregister_component(&pdev->dev);
473 
474         iounmap(spdif->regs);
475 
476         mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
477         if (mem_res)
478                 release_mem_region(mem_res->start, resource_size(mem_res));
479 
480         clk_disable_unprepare(spdif->sclk);
481         clk_disable_unprepare(spdif->pclk);
482 
483         return 0;
484 }
485 
486 static struct platform_driver samsung_spdif_driver = {
487         .probe  = spdif_probe,
488         .remove = spdif_remove,
489         .driver = {
490                 .name   = "samsung-spdif",
491                 .owner  = THIS_MODULE,
492         },
493 };
494 
495 module_platform_driver(samsung_spdif_driver);
496 
497 MODULE_AUTHOR("Seungwhan Youn, <sw.youn@samsung.com>");
498 MODULE_DESCRIPTION("Samsung S/PDIF Controller Driver");
499 MODULE_LICENSE("GPL");
500 MODULE_ALIAS("platform:samsung-spdif");
501 

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