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>
30 #define DATA_OUTBUF 0x10
35 #define CLKCTL_MASK 0x7
36 #define CLKCTL_MCLK_EXT (0x1 << 2)
37 #define CLKCTL_PWR_ON (0x1 << 0)
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)
44 #define CON_SW_RESET (0x1 << 5)
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)
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)
56 #define CON_PCM_DATA (0x1 << 0)
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)
65 #define CSTAS_CATEGORY_MASK (0xFF << 8)
66 #define CSTAS_CATEGORY_CODE_CDP (0x01 << 8)
68 #define CSTAS_NO_COPYRIGHT (0x1 << 2)
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.
83 struct samsung_spdif_info {
87 unsigned long clk_rate;
93 struct s3c_dma_params *dma_playback;
96 static struct s3c_dma_params spdif_stereo_out;
97 static struct samsung_spdif_info spdif_info;
99 static inline struct samsung_spdif_info *to_info(struct snd_soc_dai *cpu_dai)
101 return snd_soc_dai_get_drvdata(cpu_dai);
104 static void spdif_snd_txctrl(struct samsung_spdif_info *spdif, int on)
106 void __iomem *regs = spdif->regs;
109 dev_dbg(spdif->dev, "Entered %s\n", __func__);
111 clkcon = readl(regs + CLKCON) & CLKCTL_MASK;
113 writel(clkcon | CLKCTL_PWR_ON, regs + CLKCON);
115 writel(clkcon & ~CLKCTL_PWR_ON, regs + CLKCON);
118 static int spdif_set_sysclk(struct snd_soc_dai *cpu_dai,
119 int clk_id, unsigned int freq, int dir)
121 struct samsung_spdif_info *spdif = to_info(cpu_dai);
124 dev_dbg(spdif->dev, "Entered %s\n", __func__);
126 clkcon = readl(spdif->regs + CLKCON);
128 if (clk_id == SND_SOC_SPDIF_INT_MCLK)
129 clkcon &= ~CLKCTL_MCLK_EXT;
131 clkcon |= CLKCTL_MCLK_EXT;
133 writel(clkcon, spdif->regs + CLKCON);
135 spdif->clk_rate = freq;
140 static int spdif_trigger(struct snd_pcm_substream *substream, int cmd,
141 struct snd_soc_dai *dai)
143 struct snd_soc_pcm_runtime *rtd = substream->private_data;
144 struct samsung_spdif_info *spdif = to_info(rtd->cpu_dai);
147 dev_dbg(spdif->dev, "Entered %s\n", __func__);
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);
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);
171 static int spdif_sysclk_ratios[] = {
175 static int spdif_hw_params(struct snd_pcm_substream *substream,
176 struct snd_pcm_hw_params *params,
177 struct snd_soc_dai *socdai)
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;
187 dev_dbg(spdif->dev, "Entered %s\n", __func__);
189 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
190 dma_data = spdif->dma_playback;
192 dev_err(spdif->dev, "Capture is not supported\n");
196 snd_soc_dai_set_dma_data(rtd->cpu_dai, substream, dma_data);
198 spin_lock_irqsave(&spdif->lock, flags);
200 con = readl(regs + CON) & CON_MASK;
201 cstas = readl(regs + CSTAS) & CSTAS_MASK;
202 clkcon = readl(regs + CLKCON) & CLKCTL_MASK;
204 con &= ~CON_FIFO_TH_MASK;
205 con |= (0x7 << CON_FIFO_TH_SHIFT);
206 con |= CON_USERDATA_23RDBIT;
209 con &= ~CON_PCM_MASK;
210 switch (params_width(params)) {
212 con |= CON_PCM_16BIT;
215 dev_err(spdif->dev, "Unsupported data size.\n");
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])
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));
229 con &= ~CON_MCLKDIV_MASK;
232 con |= CON_MCLKDIV_256FS;
235 con |= CON_MCLKDIV_384FS;
238 con |= CON_MCLKDIV_512FS;
242 cstas &= ~CSTAS_SAMP_FREQ_MASK;
243 switch (params_rate(params)) {
245 cstas |= CSTAS_SAMP_FREQ_44;
248 cstas |= CSTAS_SAMP_FREQ_48;
251 cstas |= CSTAS_SAMP_FREQ_32;
254 cstas |= CSTAS_SAMP_FREQ_96;
257 dev_err(spdif->dev, "Invalid sampling rate %d\n",
258 params_rate(params));
262 cstas &= ~CSTAS_CATEGORY_MASK;
263 cstas |= CSTAS_CATEGORY_CODE_CDP;
264 cstas |= CSTAS_NO_COPYRIGHT;
266 writel(con, regs + CON);
267 writel(cstas, regs + CSTAS);
268 writel(clkcon, regs + CLKCON);
270 spin_unlock_irqrestore(&spdif->lock, flags);
274 spin_unlock_irqrestore(&spdif->lock, flags);
278 static void spdif_shutdown(struct snd_pcm_substream *substream,
279 struct snd_soc_dai *dai)
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;
286 dev_dbg(spdif->dev, "Entered %s\n", __func__);
288 con = readl(regs + CON) & CON_MASK;
289 clkcon = readl(regs + CLKCON) & CLKCTL_MASK;
291 writel(con | CON_SW_RESET, regs + CON);
294 writel(clkcon & ~CLKCTL_PWR_ON, regs + CLKCON);
298 static int spdif_suspend(struct snd_soc_dai *cpu_dai)
300 struct samsung_spdif_info *spdif = to_info(cpu_dai);
301 u32 con = spdif->saved_con;
303 dev_dbg(spdif->dev, "Entered %s\n", __func__);
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;
309 writel(con | CON_SW_RESET, spdif->regs + CON);
315 static int spdif_resume(struct snd_soc_dai *cpu_dai)
317 struct samsung_spdif_info *spdif = to_info(cpu_dai);
319 dev_dbg(spdif->dev, "Entered %s\n", __func__);
321 writel(spdif->saved_clkcon, spdif->regs + CLKCON);
322 writel(spdif->saved_con, spdif->regs + CON);
323 writel(spdif->saved_cstas, spdif->regs + CSTAS);
328 #define spdif_suspend NULL
329 #define spdif_resume NULL
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,
339 static struct snd_soc_dai_driver samsung_spdif_dai = {
340 .name = "samsung-spdif",
342 .stream_name = "S/PDIF Playback",
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,
355 static const struct snd_soc_component_driver samsung_spdif_component = {
356 .name = "samsung-spdif",
359 static int spdif_probe(struct platform_device *pdev)
361 struct s3c_audio_pdata *spdif_pdata;
362 struct resource *mem_res;
363 struct samsung_spdif_info *spdif;
366 spdif_pdata = pdev->dev.platform_data;
368 dev_dbg(&pdev->dev, "Entered %s\n", __func__);
370 mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
372 dev_err(&pdev->dev, "Unable to get register resource.\n");
376 if (spdif_pdata && spdif_pdata->cfg_gpio
377 && spdif_pdata->cfg_gpio(pdev)) {
378 dev_err(&pdev->dev, "Unable to configure GPIO pins\n");
383 spdif->dev = &pdev->dev;
385 spin_lock_init(&spdif->lock);
387 spdif->pclk = devm_clk_get(&pdev->dev, "spdif");
388 if (IS_ERR(spdif->pclk)) {
389 dev_err(&pdev->dev, "failed to get peri-clock\n");
393 clk_prepare_enable(spdif->pclk);
395 spdif->sclk = devm_clk_get(&pdev->dev, "sclk_spdif");
396 if (IS_ERR(spdif->sclk)) {
397 dev_err(&pdev->dev, "failed to get internal source clock\n");
401 clk_prepare_enable(spdif->sclk);
403 /* Request S/PDIF Register's memory region */
404 if (!request_mem_region(mem_res->start,
405 resource_size(mem_res), "samsung-spdif")) {
406 dev_err(&pdev->dev, "Unable to request register region\n");
411 spdif->regs = ioremap(mem_res->start, 0x100);
412 if (spdif->regs == NULL) {
413 dev_err(&pdev->dev, "Cannot ioremap registers\n");
418 dev_set_drvdata(&pdev->dev, spdif);
420 ret = devm_snd_soc_register_component(&pdev->dev,
421 &samsung_spdif_component, &samsung_spdif_dai, 1);
423 dev_err(&pdev->dev, "fail to register dai\n");
427 spdif_stereo_out.dma_size = 2;
428 spdif_stereo_out.dma_addr = mem_res->start + DATA_OUTBUF;
429 spdif_stereo_out.slave = spdif_pdata ? spdif_pdata->dma_playback : NULL;
431 spdif->dma_playback = &spdif_stereo_out;
433 ret = samsung_asoc_dma_platform_register(&pdev->dev);
435 dev_err(&pdev->dev, "failed to register DMA: %d\n", ret);
441 iounmap(spdif->regs);
443 release_mem_region(mem_res->start, resource_size(mem_res));
445 clk_disable_unprepare(spdif->sclk);
447 clk_disable_unprepare(spdif->pclk);
452 static int spdif_remove(struct platform_device *pdev)
454 struct samsung_spdif_info *spdif = &spdif_info;
455 struct resource *mem_res;
457 iounmap(spdif->regs);
459 mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
461 release_mem_region(mem_res->start, resource_size(mem_res));
463 clk_disable_unprepare(spdif->sclk);
464 clk_disable_unprepare(spdif->pclk);
469 static struct platform_driver samsung_spdif_driver = {
470 .probe = spdif_probe,
471 .remove = spdif_remove,
473 .name = "samsung-spdif",
477 module_platform_driver(samsung_spdif_driver);
479 MODULE_AUTHOR("Seungwhan Youn, <sw.youn@samsung.com>");
480 MODULE_DESCRIPTION("Samsung S/PDIF Controller Driver");
481 MODULE_LICENSE("GPL");
482 MODULE_ALIAS("platform:samsung-spdif");