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>
16
#include <sound/soc.h>
17
#include <sound/pcm_params.h>
19
#include <plat/audio.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 s3c2410_dma_client spdif_dma_client_out = {
97
.name = "S/PDIF Stereo out",
100
static struct s3c_dma_params spdif_stereo_out;
101
static struct samsung_spdif_info spdif_info;
103
static inline struct samsung_spdif_info *to_info(struct snd_soc_dai *cpu_dai)
105
return snd_soc_dai_get_drvdata(cpu_dai);
108
static void spdif_snd_txctrl(struct samsung_spdif_info *spdif, int on)
110
void __iomem *regs = spdif->regs;
113
dev_dbg(spdif->dev, "Entered %s\n", __func__);
115
clkcon = readl(regs + CLKCON) & CLKCTL_MASK;
117
writel(clkcon | CLKCTL_PWR_ON, regs + CLKCON);
119
writel(clkcon & ~CLKCTL_PWR_ON, regs + CLKCON);
122
static int spdif_set_sysclk(struct snd_soc_dai *cpu_dai,
123
int clk_id, unsigned int freq, int dir)
125
struct samsung_spdif_info *spdif = to_info(cpu_dai);
128
dev_dbg(spdif->dev, "Entered %s\n", __func__);
130
clkcon = readl(spdif->regs + CLKCON);
132
if (clk_id == SND_SOC_SPDIF_INT_MCLK)
133
clkcon &= ~CLKCTL_MCLK_EXT;
135
clkcon |= CLKCTL_MCLK_EXT;
137
writel(clkcon, spdif->regs + CLKCON);
139
spdif->clk_rate = freq;
144
static int spdif_trigger(struct snd_pcm_substream *substream, int cmd,
145
struct snd_soc_dai *dai)
147
struct snd_soc_pcm_runtime *rtd = substream->private_data;
148
struct samsung_spdif_info *spdif = to_info(rtd->cpu_dai);
151
dev_dbg(spdif->dev, "Entered %s\n", __func__);
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);
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);
175
static int spdif_sysclk_ratios[] = {
179
static int spdif_hw_params(struct snd_pcm_substream *substream,
180
struct snd_pcm_hw_params *params,
181
struct snd_soc_dai *socdai)
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;
191
dev_dbg(spdif->dev, "Entered %s\n", __func__);
193
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
194
dma_data = spdif->dma_playback;
196
dev_err(spdif->dev, "Capture is not supported\n");
200
snd_soc_dai_set_dma_data(rtd->cpu_dai, substream, dma_data);
202
spin_lock_irqsave(&spdif->lock, flags);
204
con = readl(regs + CON) & CON_MASK;
205
cstas = readl(regs + CSTAS) & CSTAS_MASK;
206
clkcon = readl(regs + CLKCON) & CLKCTL_MASK;
208
con &= ~CON_FIFO_TH_MASK;
209
con |= (0x7 << CON_FIFO_TH_SHIFT);
210
con |= CON_USERDATA_23RDBIT;
213
con &= ~CON_PCM_MASK;
214
switch (params_format(params)) {
215
case SNDRV_PCM_FORMAT_S16_LE:
216
con |= CON_PCM_16BIT;
219
dev_err(spdif->dev, "Unsupported data size.\n");
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])
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));
233
con &= ~CON_MCLKDIV_MASK;
236
con |= CON_MCLKDIV_256FS;
239
con |= CON_MCLKDIV_384FS;
242
con |= CON_MCLKDIV_512FS;
246
cstas &= ~CSTAS_SAMP_FREQ_MASK;
247
switch (params_rate(params)) {
249
cstas |= CSTAS_SAMP_FREQ_44;
252
cstas |= CSTAS_SAMP_FREQ_48;
255
cstas |= CSTAS_SAMP_FREQ_32;
258
cstas |= CSTAS_SAMP_FREQ_96;
261
dev_err(spdif->dev, "Invalid sampling rate %d\n",
262
params_rate(params));
266
cstas &= ~CSTAS_CATEGORY_MASK;
267
cstas |= CSTAS_CATEGORY_CODE_CDP;
268
cstas |= CSTAS_NO_COPYRIGHT;
270
writel(con, regs + CON);
271
writel(cstas, regs + CSTAS);
272
writel(clkcon, regs + CLKCON);
274
spin_unlock_irqrestore(&spdif->lock, flags);
278
spin_unlock_irqrestore(&spdif->lock, flags);
282
static void spdif_shutdown(struct snd_pcm_substream *substream,
283
struct snd_soc_dai *dai)
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;
290
dev_dbg(spdif->dev, "Entered %s\n", __func__);
292
con = readl(regs + CON) & CON_MASK;
293
clkcon = readl(regs + CLKCON) & CLKCTL_MASK;
295
writel(con | CON_SW_RESET, regs + CON);
298
writel(clkcon & ~CLKCTL_PWR_ON, regs + CLKCON);
302
static int spdif_suspend(struct snd_soc_dai *cpu_dai)
304
struct samsung_spdif_info *spdif = to_info(cpu_dai);
305
u32 con = spdif->saved_con;
307
dev_dbg(spdif->dev, "Entered %s\n", __func__);
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;
313
writel(con | CON_SW_RESET, spdif->regs + CON);
319
static int spdif_resume(struct snd_soc_dai *cpu_dai)
321
struct samsung_spdif_info *spdif = to_info(cpu_dai);
323
dev_dbg(spdif->dev, "Entered %s\n", __func__);
325
writel(spdif->saved_clkcon, spdif->regs + CLKCON);
326
writel(spdif->saved_con, spdif->regs + CON);
327
writel(spdif->saved_cstas, spdif->regs + CSTAS);
332
#define spdif_suspend NULL
333
#define spdif_resume NULL
336
static 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,
343
struct snd_soc_dai_driver samsung_spdif_dai = {
344
.name = "samsung-spdif",
346
.stream_name = "S/PDIF Playback",
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,
359
static __devinit int spdif_probe(struct platform_device *pdev)
361
struct s3c_audio_pdata *spdif_pdata;
362
struct resource *mem_res, *dma_res;
363
struct samsung_spdif_info *spdif;
366
spdif_pdata = pdev->dev.platform_data;
368
dev_dbg(&pdev->dev, "Entered %s\n", __func__);
370
dma_res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
372
dev_err(&pdev->dev, "Unable to get dma resource.\n");
376
mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
378
dev_err(&pdev->dev, "Unable to get register resource.\n");
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");
389
spdif->dev = &pdev->dev;
391
spin_lock_init(&spdif->lock);
393
spdif->pclk = clk_get(&pdev->dev, "spdif");
394
if (IS_ERR(spdif->pclk)) {
395
dev_err(&pdev->dev, "failed to get peri-clock\n");
399
clk_enable(spdif->pclk);
401
spdif->sclk = clk_get(&pdev->dev, "sclk_spdif");
402
if (IS_ERR(spdif->sclk)) {
403
dev_err(&pdev->dev, "failed to get internal source clock\n");
407
clk_enable(spdif->sclk);
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");
417
spdif->regs = ioremap(mem_res->start, 0x100);
418
if (spdif->regs == NULL) {
419
dev_err(&pdev->dev, "Cannot ioremap registers\n");
424
dev_set_drvdata(&pdev->dev, spdif);
426
ret = snd_soc_register_dai(&pdev->dev, &samsung_spdif_dai);
428
dev_err(&pdev->dev, "fail to register dai\n");
432
spdif_stereo_out.dma_size = 2;
433
spdif_stereo_out.client = &spdif_dma_client_out;
434
spdif_stereo_out.dma_addr = mem_res->start + DATA_OUTBUF;
435
spdif_stereo_out.channel = dma_res->start;
437
spdif->dma_playback = &spdif_stereo_out;
442
iounmap(spdif->regs);
444
release_mem_region(mem_res->start, resource_size(mem_res));
446
clk_disable(spdif->sclk);
447
clk_put(spdif->sclk);
449
clk_disable(spdif->pclk);
450
clk_put(spdif->pclk);
455
static __devexit int spdif_remove(struct platform_device *pdev)
457
struct samsung_spdif_info *spdif = &spdif_info;
458
struct resource *mem_res;
460
snd_soc_unregister_dai(&pdev->dev);
462
iounmap(spdif->regs);
464
mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
466
release_mem_region(mem_res->start, resource_size(mem_res));
468
clk_disable(spdif->sclk);
469
clk_put(spdif->sclk);
470
clk_disable(spdif->pclk);
471
clk_put(spdif->pclk);
476
static struct platform_driver samsung_spdif_driver = {
477
.probe = spdif_probe,
478
.remove = spdif_remove,
480
.name = "samsung-spdif",
481
.owner = THIS_MODULE,
485
static int __init spdif_init(void)
487
return platform_driver_register(&samsung_spdif_driver);
489
module_init(spdif_init);
491
static void __exit spdif_exit(void)
493
platform_driver_unregister(&samsung_spdif_driver);
495
module_exit(spdif_exit);
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");