1 /* sound/soc/samsung/spdif.c
3 * ALSA SoC Audio Layer - Samsung S/PDIF Controller driver
5 * Copyright (c) 2010 Samsung Electronics Co. Ltd
6 * http://www.samsung.com/
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.
13 #include <linux/clk.h>
15 #include <linux/module.h>
17 #include <sound/soc.h>
18 #include <sound/pcm_params.h>
20 #include <linux/platform_data/asoc-s3c.h>
31 #define DATA_OUTBUF 0x10
36 #define CLKCTL_MASK 0x7
37 #define CLKCTL_MCLK_EXT (0x1 << 2)
38 #define CLKCTL_PWR_ON (0x1 << 0)
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)
45 #define CON_SW_RESET (0x1 << 5)
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)
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)
57 #define CON_PCM_DATA (0x1 << 0)
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)
66 #define CSTAS_CATEGORY_MASK (0xFF << 8)
67 #define CSTAS_CATEGORY_CODE_CDP (0x01 << 8)
69 #define CSTAS_NO_COPYRIGHT (0x1 << 2)
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.
84 struct samsung_spdif_info {
88 unsigned long clk_rate;
94 struct s3c_dma_params *dma_playback;
97 static struct s3c2410_dma_client spdif_dma_client_out = {
98 .name = "S/PDIF Stereo out",
101 static struct s3c_dma_params spdif_stereo_out;
102 static struct samsung_spdif_info spdif_info;
104 static inline struct samsung_spdif_info *to_info(struct snd_soc_dai *cpu_dai)
106 return snd_soc_dai_get_drvdata(cpu_dai);
109 static void spdif_snd_txctrl(struct samsung_spdif_info *spdif, int on)
111 void __iomem *regs = spdif->regs;
114 dev_dbg(spdif->dev, "Entered %s\n", __func__);
116 clkcon = readl(regs + CLKCON) & CLKCTL_MASK;
118 writel(clkcon | CLKCTL_PWR_ON, regs + CLKCON);
120 writel(clkcon & ~CLKCTL_PWR_ON, regs + CLKCON);
123 static int spdif_set_sysclk(struct snd_soc_dai *cpu_dai,
124 int clk_id, unsigned int freq, int dir)
126 struct samsung_spdif_info *spdif = to_info(cpu_dai);
129 dev_dbg(spdif->dev, "Entered %s\n", __func__);
131 clkcon = readl(spdif->regs + CLKCON);
133 if (clk_id == SND_SOC_SPDIF_INT_MCLK)
134 clkcon &= ~CLKCTL_MCLK_EXT;
136 clkcon |= CLKCTL_MCLK_EXT;
138 writel(clkcon, spdif->regs + CLKCON);
140 spdif->clk_rate = freq;
145 static int spdif_trigger(struct snd_pcm_substream *substream, int cmd,
146 struct snd_soc_dai *dai)
148 struct snd_soc_pcm_runtime *rtd = substream->private_data;
149 struct samsung_spdif_info *spdif = to_info(rtd->cpu_dai);
152 dev_dbg(spdif->dev, "Entered %s\n", __func__);
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);
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);
176 static int spdif_sysclk_ratios[] = {
180 static int spdif_hw_params(struct snd_pcm_substream *substream,
181 struct snd_pcm_hw_params *params,
182 struct snd_soc_dai *socdai)
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;
192 dev_dbg(spdif->dev, "Entered %s\n", __func__);
194 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
195 dma_data = spdif->dma_playback;
197 dev_err(spdif->dev, "Capture is not supported\n");
201 snd_soc_dai_set_dma_data(rtd->cpu_dai, substream, dma_data);
203 spin_lock_irqsave(&spdif->lock, flags);
205 con = readl(regs + CON) & CON_MASK;
206 cstas = readl(regs + CSTAS) & CSTAS_MASK;
207 clkcon = readl(regs + CLKCON) & CLKCTL_MASK;
209 con &= ~CON_FIFO_TH_MASK;
210 con |= (0x7 << CON_FIFO_TH_SHIFT);
211 con |= CON_USERDATA_23RDBIT;
214 con &= ~CON_PCM_MASK;
215 switch (params_format(params)) {
216 case SNDRV_PCM_FORMAT_S16_LE:
217 con |= CON_PCM_16BIT;
220 dev_err(spdif->dev, "Unsupported data size.\n");
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])
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));
234 con &= ~CON_MCLKDIV_MASK;
237 con |= CON_MCLKDIV_256FS;
240 con |= CON_MCLKDIV_384FS;
243 con |= CON_MCLKDIV_512FS;
247 cstas &= ~CSTAS_SAMP_FREQ_MASK;
248 switch (params_rate(params)) {
250 cstas |= CSTAS_SAMP_FREQ_44;
253 cstas |= CSTAS_SAMP_FREQ_48;
256 cstas |= CSTAS_SAMP_FREQ_32;
259 cstas |= CSTAS_SAMP_FREQ_96;
262 dev_err(spdif->dev, "Invalid sampling rate %d\n",
263 params_rate(params));
267 cstas &= ~CSTAS_CATEGORY_MASK;
268 cstas |= CSTAS_CATEGORY_CODE_CDP;
269 cstas |= CSTAS_NO_COPYRIGHT;
271 writel(con, regs + CON);
272 writel(cstas, regs + CSTAS);
273 writel(clkcon, regs + CLKCON);
275 spin_unlock_irqrestore(&spdif->lock, flags);
279 spin_unlock_irqrestore(&spdif->lock, flags);
283 static void spdif_shutdown(struct snd_pcm_substream *substream,
284 struct snd_soc_dai *dai)
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;
291 dev_dbg(spdif->dev, "Entered %s\n", __func__);
293 con = readl(regs + CON) & CON_MASK;
294 clkcon = readl(regs + CLKCON) & CLKCTL_MASK;
296 writel(con | CON_SW_RESET, regs + CON);
299 writel(clkcon & ~CLKCTL_PWR_ON, regs + CLKCON);
303 static int spdif_suspend(struct snd_soc_dai *cpu_dai)
305 struct samsung_spdif_info *spdif = to_info(cpu_dai);
306 u32 con = spdif->saved_con;
308 dev_dbg(spdif->dev, "Entered %s\n", __func__);
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;
314 writel(con | CON_SW_RESET, spdif->regs + CON);
320 static int spdif_resume(struct snd_soc_dai *cpu_dai)
322 struct samsung_spdif_info *spdif = to_info(cpu_dai);
324 dev_dbg(spdif->dev, "Entered %s\n", __func__);
326 writel(spdif->saved_clkcon, spdif->regs + CLKCON);
327 writel(spdif->saved_con, spdif->regs + CON);
328 writel(spdif->saved_cstas, spdif->regs + CSTAS);
333 #define spdif_suspend NULL
334 #define spdif_resume NULL
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,
344 static struct snd_soc_dai_driver samsung_spdif_dai = {
345 .name = "samsung-spdif",
347 .stream_name = "S/PDIF Playback",
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,
360 static const struct snd_soc_component_driver samsung_spdif_component = {
361 .name = "samsung-spdif",
364 static int spdif_probe(struct platform_device *pdev)
366 struct s3c_audio_pdata *spdif_pdata;
367 struct resource *mem_res, *dma_res;
368 struct samsung_spdif_info *spdif;
371 spdif_pdata = pdev->dev.platform_data;
373 dev_dbg(&pdev->dev, "Entered %s\n", __func__);
375 dma_res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
377 dev_err(&pdev->dev, "Unable to get dma resource.\n");
381 mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
383 dev_err(&pdev->dev, "Unable to get register resource.\n");
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");
394 spdif->dev = &pdev->dev;
396 spin_lock_init(&spdif->lock);
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");
404 clk_prepare_enable(spdif->pclk);
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");
412 clk_prepare_enable(spdif->sclk);
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");
422 spdif->regs = ioremap(mem_res->start, 0x100);
423 if (spdif->regs == NULL) {
424 dev_err(&pdev->dev, "Cannot ioremap registers\n");
429 dev_set_drvdata(&pdev->dev, spdif);
431 ret = snd_soc_register_component(&pdev->dev, &samsung_spdif_component,
432 &samsung_spdif_dai, 1);
434 dev_err(&pdev->dev, "fail to register dai\n");
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;
443 spdif->dma_playback = &spdif_stereo_out;
445 ret = samsung_asoc_dma_platform_register(&pdev->dev);
447 dev_err(&pdev->dev, "failed to register DMA: %d\n", ret);
453 snd_soc_unregister_component(&pdev->dev);
455 iounmap(spdif->regs);
457 release_mem_region(mem_res->start, resource_size(mem_res));
459 clk_disable_unprepare(spdif->sclk);
461 clk_disable_unprepare(spdif->pclk);
466 static int spdif_remove(struct platform_device *pdev)
468 struct samsung_spdif_info *spdif = &spdif_info;
469 struct resource *mem_res;
471 samsung_asoc_dma_platform_unregister(&pdev->dev);
472 snd_soc_unregister_component(&pdev->dev);
474 iounmap(spdif->regs);
476 mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
478 release_mem_region(mem_res->start, resource_size(mem_res));
480 clk_disable_unprepare(spdif->sclk);
481 clk_disable_unprepare(spdif->pclk);
486 static struct platform_driver samsung_spdif_driver = {
487 .probe = spdif_probe,
488 .remove = spdif_remove,
490 .name = "samsung-spdif",
491 .owner = THIS_MODULE,
495 module_platform_driver(samsung_spdif_driver);
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");