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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_params spdif_stereo_out;
 97 static struct samsung_spdif_info spdif_info;
 98 
 99 static inline struct samsung_spdif_info *to_info(struct snd_soc_dai *cpu_dai)
100 {
101         return snd_soc_dai_get_drvdata(cpu_dai);
102 }
103 
104 static void spdif_snd_txctrl(struct samsung_spdif_info *spdif, int on)
105 {
106         void __iomem *regs = spdif->regs;
107         u32 clkcon;
108 
109         dev_dbg(spdif->dev, "Entered %s\n", __func__);
110 
111         clkcon = readl(regs + CLKCON) & CLKCTL_MASK;
112         if (on)
113                 writel(clkcon | CLKCTL_PWR_ON, regs + CLKCON);
114         else
115                 writel(clkcon & ~CLKCTL_PWR_ON, regs + CLKCON);
116 }
117 
118 static int spdif_set_sysclk(struct snd_soc_dai *cpu_dai,
119                                 int clk_id, unsigned int freq, int dir)
120 {
121         struct samsung_spdif_info *spdif = to_info(cpu_dai);
122         u32 clkcon;
123 
124         dev_dbg(spdif->dev, "Entered %s\n", __func__);
125 
126         clkcon = readl(spdif->regs + CLKCON);
127 
128         if (clk_id == SND_SOC_SPDIF_INT_MCLK)
129                 clkcon &= ~CLKCTL_MCLK_EXT;
130         else
131                 clkcon |= CLKCTL_MCLK_EXT;
132 
133         writel(clkcon, spdif->regs + CLKCON);
134 
135         spdif->clk_rate = freq;
136 
137         return 0;
138 }
139 
140 static int spdif_trigger(struct snd_pcm_substream *substream, int cmd,
141                                 struct snd_soc_dai *dai)
142 {
143         struct snd_soc_pcm_runtime *rtd = substream->private_data;
144         struct samsung_spdif_info *spdif = to_info(rtd->cpu_dai);
145         unsigned long flags;
146 
147         dev_dbg(spdif->dev, "Entered %s\n", __func__);
148 
149         switch (cmd) {
150         case SNDRV_PCM_TRIGGER_START:
151         case SNDRV_PCM_TRIGGER_RESUME:
152         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
153                 spin_lock_irqsave(&spdif->lock, flags);
154                 spdif_snd_txctrl(spdif, 1);
155                 spin_unlock_irqrestore(&spdif->lock, flags);
156                 break;
157         case SNDRV_PCM_TRIGGER_STOP:
158         case SNDRV_PCM_TRIGGER_SUSPEND:
159         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
160                 spin_lock_irqsave(&spdif->lock, flags);
161                 spdif_snd_txctrl(spdif, 0);
162                 spin_unlock_irqrestore(&spdif->lock, flags);
163                 break;
164         default:
165                 return -EINVAL;
166         }
167 
168         return 0;
169 }
170 
171 static int spdif_sysclk_ratios[] = {
172         512, 384, 256,
173 };
174 
175 static int spdif_hw_params(struct snd_pcm_substream *substream,
176                                 struct snd_pcm_hw_params *params,
177                                 struct snd_soc_dai *socdai)
178 {
179         struct snd_soc_pcm_runtime *rtd = substream->private_data;
180         struct samsung_spdif_info *spdif = to_info(rtd->cpu_dai);
181         void __iomem *regs = spdif->regs;
182         struct s3c_dma_params *dma_data;
183         u32 con, clkcon, cstas;
184         unsigned long flags;
185         int i, ratio;
186 
187         dev_dbg(spdif->dev, "Entered %s\n", __func__);
188 
189         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
190                 dma_data = spdif->dma_playback;
191         else {
192                 dev_err(spdif->dev, "Capture is not supported\n");
193                 return -EINVAL;
194         }
195 
196         snd_soc_dai_set_dma_data(rtd->cpu_dai, substream, dma_data);
197 
198         spin_lock_irqsave(&spdif->lock, flags);
199 
200         con = readl(regs + CON) & CON_MASK;
201         cstas = readl(regs + CSTAS) & CSTAS_MASK;
202         clkcon = readl(regs + CLKCON) & CLKCTL_MASK;
203 
204         con &= ~CON_FIFO_TH_MASK;
205         con |= (0x7 << CON_FIFO_TH_SHIFT);
206         con |= CON_USERDATA_23RDBIT;
207         con |= CON_PCM_DATA;
208 
209         con &= ~CON_PCM_MASK;
210         switch (params_width(params)) {
211         case 16:
212                 con |= CON_PCM_16BIT;
213                 break;
214         default:
215                 dev_err(spdif->dev, "Unsupported data size.\n");
216                 goto err;
217         }
218 
219         ratio = spdif->clk_rate / params_rate(params);
220         for (i = 0; i < ARRAY_SIZE(spdif_sysclk_ratios); i++)
221                 if (ratio == spdif_sysclk_ratios[i])
222                         break;
223         if (i == ARRAY_SIZE(spdif_sysclk_ratios)) {
224                 dev_err(spdif->dev, "Invalid clock ratio %ld/%d\n",
225                                 spdif->clk_rate, params_rate(params));
226                 goto err;
227         }
228 
229         con &= ~CON_MCLKDIV_MASK;
230         switch (ratio) {
231         case 256:
232                 con |= CON_MCLKDIV_256FS;
233                 break;
234         case 384:
235                 con |= CON_MCLKDIV_384FS;
236                 break;
237         case 512:
238                 con |= CON_MCLKDIV_512FS;
239                 break;
240         }
241 
242         cstas &= ~CSTAS_SAMP_FREQ_MASK;
243         switch (params_rate(params)) {
244         case 44100:
245                 cstas |= CSTAS_SAMP_FREQ_44;
246                 break;
247         case 48000:
248                 cstas |= CSTAS_SAMP_FREQ_48;
249                 break;
250         case 32000:
251                 cstas |= CSTAS_SAMP_FREQ_32;
252                 break;
253         case 96000:
254                 cstas |= CSTAS_SAMP_FREQ_96;
255                 break;
256         default:
257                 dev_err(spdif->dev, "Invalid sampling rate %d\n",
258                                 params_rate(params));
259                 goto err;
260         }
261 
262         cstas &= ~CSTAS_CATEGORY_MASK;
263         cstas |= CSTAS_CATEGORY_CODE_CDP;
264         cstas |= CSTAS_NO_COPYRIGHT;
265 
266         writel(con, regs + CON);
267         writel(cstas, regs + CSTAS);
268         writel(clkcon, regs + CLKCON);
269 
270         spin_unlock_irqrestore(&spdif->lock, flags);
271 
272         return 0;
273 err:
274         spin_unlock_irqrestore(&spdif->lock, flags);
275         return -EINVAL;
276 }
277 
278 static void spdif_shutdown(struct snd_pcm_substream *substream,
279                                 struct snd_soc_dai *dai)
280 {
281         struct snd_soc_pcm_runtime *rtd = substream->private_data;
282         struct samsung_spdif_info *spdif = to_info(rtd->cpu_dai);
283         void __iomem *regs = spdif->regs;
284         u32 con, clkcon;
285 
286         dev_dbg(spdif->dev, "Entered %s\n", __func__);
287 
288         con = readl(regs + CON) & CON_MASK;
289         clkcon = readl(regs + CLKCON) & CLKCTL_MASK;
290 
291         writel(con | CON_SW_RESET, regs + CON);
292         cpu_relax();
293 
294         writel(clkcon & ~CLKCTL_PWR_ON, regs + CLKCON);
295 }
296 
297 #ifdef CONFIG_PM
298 static int spdif_suspend(struct snd_soc_dai *cpu_dai)
299 {
300         struct samsung_spdif_info *spdif = to_info(cpu_dai);
301         u32 con = spdif->saved_con;
302 
303         dev_dbg(spdif->dev, "Entered %s\n", __func__);
304 
305         spdif->saved_clkcon = readl(spdif->regs + CLKCON) & CLKCTL_MASK;
306         spdif->saved_con = readl(spdif->regs + CON) & CON_MASK;
307         spdif->saved_cstas = readl(spdif->regs + CSTAS) & CSTAS_MASK;
308 
309         writel(con | CON_SW_RESET, spdif->regs + CON);
310         cpu_relax();
311 
312         return 0;
313 }
314 
315 static int spdif_resume(struct snd_soc_dai *cpu_dai)
316 {
317         struct samsung_spdif_info *spdif = to_info(cpu_dai);
318 
319         dev_dbg(spdif->dev, "Entered %s\n", __func__);
320 
321         writel(spdif->saved_clkcon, spdif->regs + CLKCON);
322         writel(spdif->saved_con, spdif->regs + CON);
323         writel(spdif->saved_cstas, spdif->regs + CSTAS);
324 
325         return 0;
326 }
327 #else
328 #define spdif_suspend NULL
329 #define spdif_resume NULL
330 #endif
331 
332 static const struct snd_soc_dai_ops spdif_dai_ops = {
333         .set_sysclk     = spdif_set_sysclk,
334         .trigger        = spdif_trigger,
335         .hw_params      = spdif_hw_params,
336         .shutdown       = spdif_shutdown,
337 };
338 
339 static struct snd_soc_dai_driver samsung_spdif_dai = {
340         .name = "samsung-spdif",
341         .playback = {
342                 .stream_name = "S/PDIF Playback",
343                 .channels_min = 2,
344                 .channels_max = 2,
345                 .rates = (SNDRV_PCM_RATE_32000 |
346                                 SNDRV_PCM_RATE_44100 |
347                                 SNDRV_PCM_RATE_48000 |
348                                 SNDRV_PCM_RATE_96000),
349                 .formats = SNDRV_PCM_FMTBIT_S16_LE, },
350         .ops = &spdif_dai_ops,
351         .suspend = spdif_suspend,
352         .resume = spdif_resume,
353 };
354 
355 static const struct snd_soc_component_driver samsung_spdif_component = {
356         .name           = "samsung-spdif",
357 };
358 
359 static int spdif_probe(struct platform_device *pdev)
360 {
361         struct s3c_audio_pdata *spdif_pdata;
362         struct resource *mem_res, *dma_res;
363         struct samsung_spdif_info *spdif;
364         int ret;
365 
366         spdif_pdata = pdev->dev.platform_data;
367 
368         dev_dbg(&pdev->dev, "Entered %s\n", __func__);
369 
370         dma_res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
371         if (!dma_res) {
372                 dev_err(&pdev->dev, "Unable to get dma resource.\n");
373                 return -ENXIO;
374         }
375 
376         mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
377         if (!mem_res) {
378                 dev_err(&pdev->dev, "Unable to get register resource.\n");
379                 return -ENXIO;
380         }
381 
382         if (spdif_pdata && spdif_pdata->cfg_gpio
383                         && spdif_pdata->cfg_gpio(pdev)) {
384                 dev_err(&pdev->dev, "Unable to configure GPIO pins\n");
385                 return -EINVAL;
386         }
387 
388         spdif = &spdif_info;
389         spdif->dev = &pdev->dev;
390 
391         spin_lock_init(&spdif->lock);
392 
393         spdif->pclk = devm_clk_get(&pdev->dev, "spdif");
394         if (IS_ERR(spdif->pclk)) {
395                 dev_err(&pdev->dev, "failed to get peri-clock\n");
396                 ret = -ENOENT;
397                 goto err0;
398         }
399         clk_prepare_enable(spdif->pclk);
400 
401         spdif->sclk = devm_clk_get(&pdev->dev, "sclk_spdif");
402         if (IS_ERR(spdif->sclk)) {
403                 dev_err(&pdev->dev, "failed to get internal source clock\n");
404                 ret = -ENOENT;
405                 goto err1;
406         }
407         clk_prepare_enable(spdif->sclk);
408 
409         /* Request S/PDIF Register's memory region */
410         if (!request_mem_region(mem_res->start,
411                                 resource_size(mem_res), "samsung-spdif")) {
412                 dev_err(&pdev->dev, "Unable to request register region\n");
413                 ret = -EBUSY;
414                 goto err2;
415         }
416 
417         spdif->regs = ioremap(mem_res->start, 0x100);
418         if (spdif->regs == NULL) {
419                 dev_err(&pdev->dev, "Cannot ioremap registers\n");
420                 ret = -ENXIO;
421                 goto err3;
422         }
423 
424         dev_set_drvdata(&pdev->dev, spdif);
425 
426         ret = devm_snd_soc_register_component(&pdev->dev,
427                         &samsung_spdif_component, &samsung_spdif_dai, 1);
428         if (ret != 0) {
429                 dev_err(&pdev->dev, "fail to register dai\n");
430                 goto err4;
431         }
432 
433         spdif_stereo_out.dma_size = 2;
434         spdif_stereo_out.dma_addr = mem_res->start + DATA_OUTBUF;
435         spdif_stereo_out.channel = dma_res->start;
436 
437         spdif->dma_playback = &spdif_stereo_out;
438 
439         ret = samsung_asoc_dma_platform_register(&pdev->dev);
440         if (ret) {
441                 dev_err(&pdev->dev, "failed to register DMA: %d\n", ret);
442                 goto err4;
443         }
444 
445         return 0;
446 err4:
447         iounmap(spdif->regs);
448 err3:
449         release_mem_region(mem_res->start, resource_size(mem_res));
450 err2:
451         clk_disable_unprepare(spdif->sclk);
452 err1:
453         clk_disable_unprepare(spdif->pclk);
454 err0:
455         return ret;
456 }
457 
458 static int spdif_remove(struct platform_device *pdev)
459 {
460         struct samsung_spdif_info *spdif = &spdif_info;
461         struct resource *mem_res;
462 
463         iounmap(spdif->regs);
464 
465         mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
466         if (mem_res)
467                 release_mem_region(mem_res->start, resource_size(mem_res));
468 
469         clk_disable_unprepare(spdif->sclk);
470         clk_disable_unprepare(spdif->pclk);
471 
472         return 0;
473 }
474 
475 static struct platform_driver samsung_spdif_driver = {
476         .probe  = spdif_probe,
477         .remove = spdif_remove,
478         .driver = {
479                 .name   = "samsung-spdif",
480                 .owner  = THIS_MODULE,
481         },
482 };
483 
484 module_platform_driver(samsung_spdif_driver);
485 
486 MODULE_AUTHOR("Seungwhan Youn, <sw.youn@samsung.com>");
487 MODULE_DESCRIPTION("Samsung S/PDIF Controller Driver");
488 MODULE_LICENSE("GPL");
489 MODULE_ALIAS("platform:samsung-spdif");
490 

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