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8#include <linux/clk.h>
9#include <linux/io.h>
10#include <linux/module.h>
11
12#include <sound/soc.h>
13#include <sound/pcm_params.h>
14
15#include <linux/platform_data/asoc-s3c.h>
16
17#include "dma.h"
18#include "spdif.h"
19
20
21#define CLKCON 0x00
22#define CON 0x04
23#define BSTAS 0x08
24#define CSTAS 0x0C
25#define DATA_OUTBUF 0x10
26#define DCNT 0x14
27#define BSTAS_S 0x18
28#define DCNT_S 0x1C
29
30#define CLKCTL_MASK 0x7
31#define CLKCTL_MCLK_EXT (0x1 << 2)
32#define CLKCTL_PWR_ON (0x1 << 0)
33
34#define CON_MASK 0x3ffffff
35#define CON_FIFO_TH_SHIFT 19
36#define CON_FIFO_TH_MASK (0x7 << 19)
37#define CON_USERDATA_23RDBIT (0x1 << 12)
38
39#define CON_SW_RESET (0x1 << 5)
40
41#define CON_MCLKDIV_MASK (0x3 << 3)
42#define CON_MCLKDIV_256FS (0x0 << 3)
43#define CON_MCLKDIV_384FS (0x1 << 3)
44#define CON_MCLKDIV_512FS (0x2 << 3)
45
46#define CON_PCM_MASK (0x3 << 1)
47#define CON_PCM_16BIT (0x0 << 1)
48#define CON_PCM_20BIT (0x1 << 1)
49#define CON_PCM_24BIT (0x2 << 1)
50
51#define CON_PCM_DATA (0x1 << 0)
52
53#define CSTAS_MASK 0x3fffffff
54#define CSTAS_SAMP_FREQ_MASK (0xF << 24)
55#define CSTAS_SAMP_FREQ_44 (0x0 << 24)
56#define CSTAS_SAMP_FREQ_48 (0x2 << 24)
57#define CSTAS_SAMP_FREQ_32 (0x3 << 24)
58#define CSTAS_SAMP_FREQ_96 (0xA << 24)
59
60#define CSTAS_CATEGORY_MASK (0xFF << 8)
61#define CSTAS_CATEGORY_CODE_CDP (0x01 << 8)
62
63#define CSTAS_NO_COPYRIGHT (0x1 << 2)
64
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77
78struct samsung_spdif_info {
79 spinlock_t lock;
80 struct device *dev;
81 void __iomem *regs;
82 unsigned long clk_rate;
83 struct clk *pclk;
84 struct clk *sclk;
85 u32 saved_clkcon;
86 u32 saved_con;
87 u32 saved_cstas;
88 struct snd_dmaengine_dai_dma_data *dma_playback;
89};
90
91static struct snd_dmaengine_dai_dma_data spdif_stereo_out;
92static struct samsung_spdif_info spdif_info;
93
94static inline struct samsung_spdif_info *to_info(struct snd_soc_dai *cpu_dai)
95{
96 return snd_soc_dai_get_drvdata(cpu_dai);
97}
98
99static void spdif_snd_txctrl(struct samsung_spdif_info *spdif, int on)
100{
101 void __iomem *regs = spdif->regs;
102 u32 clkcon;
103
104 dev_dbg(spdif->dev, "Entered %s\n", __func__);
105
106 clkcon = readl(regs + CLKCON) & CLKCTL_MASK;
107 if (on)
108 writel(clkcon | CLKCTL_PWR_ON, regs + CLKCON);
109 else
110 writel(clkcon & ~CLKCTL_PWR_ON, regs + CLKCON);
111}
112
113static int spdif_set_sysclk(struct snd_soc_dai *cpu_dai,
114 int clk_id, unsigned int freq, int dir)
115{
116 struct samsung_spdif_info *spdif = to_info(cpu_dai);
117 u32 clkcon;
118
119 dev_dbg(spdif->dev, "Entered %s\n", __func__);
120
121 clkcon = readl(spdif->regs + CLKCON);
122
123 if (clk_id == SND_SOC_SPDIF_INT_MCLK)
124 clkcon &= ~CLKCTL_MCLK_EXT;
125 else
126 clkcon |= CLKCTL_MCLK_EXT;
127
128 writel(clkcon, spdif->regs + CLKCON);
129
130 spdif->clk_rate = freq;
131
132 return 0;
133}
134
135static int spdif_trigger(struct snd_pcm_substream *substream, int cmd,
136 struct snd_soc_dai *dai)
137{
138 struct snd_soc_pcm_runtime *rtd = substream->private_data;
139 struct samsung_spdif_info *spdif = to_info(rtd->cpu_dai);
140 unsigned long flags;
141
142 dev_dbg(spdif->dev, "Entered %s\n", __func__);
143
144 switch (cmd) {
145 case SNDRV_PCM_TRIGGER_START:
146 case SNDRV_PCM_TRIGGER_RESUME:
147 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
148 spin_lock_irqsave(&spdif->lock, flags);
149 spdif_snd_txctrl(spdif, 1);
150 spin_unlock_irqrestore(&spdif->lock, flags);
151 break;
152 case SNDRV_PCM_TRIGGER_STOP:
153 case SNDRV_PCM_TRIGGER_SUSPEND:
154 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
155 spin_lock_irqsave(&spdif->lock, flags);
156 spdif_snd_txctrl(spdif, 0);
157 spin_unlock_irqrestore(&spdif->lock, flags);
158 break;
159 default:
160 return -EINVAL;
161 }
162
163 return 0;
164}
165
166static int spdif_sysclk_ratios[] = {
167 512, 384, 256,
168};
169
170static int spdif_hw_params(struct snd_pcm_substream *substream,
171 struct snd_pcm_hw_params *params,
172 struct snd_soc_dai *socdai)
173{
174 struct snd_soc_pcm_runtime *rtd = substream->private_data;
175 struct samsung_spdif_info *spdif = to_info(rtd->cpu_dai);
176 void __iomem *regs = spdif->regs;
177 struct snd_dmaengine_dai_dma_data *dma_data;
178 u32 con, clkcon, cstas;
179 unsigned long flags;
180 int i, ratio;
181
182 dev_dbg(spdif->dev, "Entered %s\n", __func__);
183
184 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
185 dma_data = spdif->dma_playback;
186 else {
187 dev_err(spdif->dev, "Capture is not supported\n");
188 return -EINVAL;
189 }
190
191 snd_soc_dai_set_dma_data(rtd->cpu_dai, substream, dma_data);
192
193 spin_lock_irqsave(&spdif->lock, flags);
194
195 con = readl(regs + CON) & CON_MASK;
196 cstas = readl(regs + CSTAS) & CSTAS_MASK;
197 clkcon = readl(regs + CLKCON) & CLKCTL_MASK;
198
199 con &= ~CON_FIFO_TH_MASK;
200 con |= (0x7 << CON_FIFO_TH_SHIFT);
201 con |= CON_USERDATA_23RDBIT;
202 con |= CON_PCM_DATA;
203
204 con &= ~CON_PCM_MASK;
205 switch (params_width(params)) {
206 case 16:
207 con |= CON_PCM_16BIT;
208 break;
209 default:
210 dev_err(spdif->dev, "Unsupported data size.\n");
211 goto err;
212 }
213
214 ratio = spdif->clk_rate / params_rate(params);
215 for (i = 0; i < ARRAY_SIZE(spdif_sysclk_ratios); i++)
216 if (ratio == spdif_sysclk_ratios[i])
217 break;
218 if (i == ARRAY_SIZE(spdif_sysclk_ratios)) {
219 dev_err(spdif->dev, "Invalid clock ratio %ld/%d\n",
220 spdif->clk_rate, params_rate(params));
221 goto err;
222 }
223
224 con &= ~CON_MCLKDIV_MASK;
225 switch (ratio) {
226 case 256:
227 con |= CON_MCLKDIV_256FS;
228 break;
229 case 384:
230 con |= CON_MCLKDIV_384FS;
231 break;
232 case 512:
233 con |= CON_MCLKDIV_512FS;
234 break;
235 }
236
237 cstas &= ~CSTAS_SAMP_FREQ_MASK;
238 switch (params_rate(params)) {
239 case 44100:
240 cstas |= CSTAS_SAMP_FREQ_44;
241 break;
242 case 48000:
243 cstas |= CSTAS_SAMP_FREQ_48;
244 break;
245 case 32000:
246 cstas |= CSTAS_SAMP_FREQ_32;
247 break;
248 case 96000:
249 cstas |= CSTAS_SAMP_FREQ_96;
250 break;
251 default:
252 dev_err(spdif->dev, "Invalid sampling rate %d\n",
253 params_rate(params));
254 goto err;
255 }
256
257 cstas &= ~CSTAS_CATEGORY_MASK;
258 cstas |= CSTAS_CATEGORY_CODE_CDP;
259 cstas |= CSTAS_NO_COPYRIGHT;
260
261 writel(con, regs + CON);
262 writel(cstas, regs + CSTAS);
263 writel(clkcon, regs + CLKCON);
264
265 spin_unlock_irqrestore(&spdif->lock, flags);
266
267 return 0;
268err:
269 spin_unlock_irqrestore(&spdif->lock, flags);
270 return -EINVAL;
271}
272
273static void spdif_shutdown(struct snd_pcm_substream *substream,
274 struct snd_soc_dai *dai)
275{
276 struct snd_soc_pcm_runtime *rtd = substream->private_data;
277 struct samsung_spdif_info *spdif = to_info(rtd->cpu_dai);
278 void __iomem *regs = spdif->regs;
279 u32 con, clkcon;
280
281 dev_dbg(spdif->dev, "Entered %s\n", __func__);
282
283 con = readl(regs + CON) & CON_MASK;
284 clkcon = readl(regs + CLKCON) & CLKCTL_MASK;
285
286 writel(con | CON_SW_RESET, regs + CON);
287 cpu_relax();
288
289 writel(clkcon & ~CLKCTL_PWR_ON, regs + CLKCON);
290}
291
292#ifdef CONFIG_PM
293static int spdif_suspend(struct snd_soc_dai *cpu_dai)
294{
295 struct samsung_spdif_info *spdif = to_info(cpu_dai);
296 u32 con = spdif->saved_con;
297
298 dev_dbg(spdif->dev, "Entered %s\n", __func__);
299
300 spdif->saved_clkcon = readl(spdif->regs + CLKCON) & CLKCTL_MASK;
301 spdif->saved_con = readl(spdif->regs + CON) & CON_MASK;
302 spdif->saved_cstas = readl(spdif->regs + CSTAS) & CSTAS_MASK;
303
304 writel(con | CON_SW_RESET, spdif->regs + CON);
305 cpu_relax();
306
307 return 0;
308}
309
310static int spdif_resume(struct snd_soc_dai *cpu_dai)
311{
312 struct samsung_spdif_info *spdif = to_info(cpu_dai);
313
314 dev_dbg(spdif->dev, "Entered %s\n", __func__);
315
316 writel(spdif->saved_clkcon, spdif->regs + CLKCON);
317 writel(spdif->saved_con, spdif->regs + CON);
318 writel(spdif->saved_cstas, spdif->regs + CSTAS);
319
320 return 0;
321}
322#else
323#define spdif_suspend NULL
324#define spdif_resume NULL
325#endif
326
327static const struct snd_soc_dai_ops spdif_dai_ops = {
328 .set_sysclk = spdif_set_sysclk,
329 .trigger = spdif_trigger,
330 .hw_params = spdif_hw_params,
331 .shutdown = spdif_shutdown,
332};
333
334static struct snd_soc_dai_driver samsung_spdif_dai = {
335 .name = "samsung-spdif",
336 .playback = {
337 .stream_name = "S/PDIF Playback",
338 .channels_min = 2,
339 .channels_max = 2,
340 .rates = (SNDRV_PCM_RATE_32000 |
341 SNDRV_PCM_RATE_44100 |
342 SNDRV_PCM_RATE_48000 |
343 SNDRV_PCM_RATE_96000),
344 .formats = SNDRV_PCM_FMTBIT_S16_LE, },
345 .ops = &spdif_dai_ops,
346 .suspend = spdif_suspend,
347 .resume = spdif_resume,
348};
349
350static const struct snd_soc_component_driver samsung_spdif_component = {
351 .name = "samsung-spdif",
352};
353
354static int spdif_probe(struct platform_device *pdev)
355{
356 struct s3c_audio_pdata *spdif_pdata;
357 struct resource *mem_res;
358 struct samsung_spdif_info *spdif;
359 dma_filter_fn filter;
360 int ret;
361
362 spdif_pdata = pdev->dev.platform_data;
363
364 dev_dbg(&pdev->dev, "Entered %s\n", __func__);
365
366 mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
367 if (!mem_res) {
368 dev_err(&pdev->dev, "Unable to get register resource.\n");
369 return -ENXIO;
370 }
371
372 if (spdif_pdata && spdif_pdata->cfg_gpio
373 && spdif_pdata->cfg_gpio(pdev)) {
374 dev_err(&pdev->dev, "Unable to configure GPIO pins\n");
375 return -EINVAL;
376 }
377
378 spdif = &spdif_info;
379 spdif->dev = &pdev->dev;
380
381 spin_lock_init(&spdif->lock);
382
383 spdif->pclk = devm_clk_get(&pdev->dev, "spdif");
384 if (IS_ERR(spdif->pclk)) {
385 dev_err(&pdev->dev, "failed to get peri-clock\n");
386 ret = -ENOENT;
387 goto err0;
388 }
389 ret = clk_prepare_enable(spdif->pclk);
390 if (ret)
391 goto err0;
392
393 spdif->sclk = devm_clk_get(&pdev->dev, "sclk_spdif");
394 if (IS_ERR(spdif->sclk)) {
395 dev_err(&pdev->dev, "failed to get internal source clock\n");
396 ret = -ENOENT;
397 goto err1;
398 }
399 ret = clk_prepare_enable(spdif->sclk);
400 if (ret)
401 goto err1;
402
403
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");
407 ret = -EBUSY;
408 goto err2;
409 }
410
411 spdif->regs = ioremap(mem_res->start, 0x100);
412 if (spdif->regs == NULL) {
413 dev_err(&pdev->dev, "Cannot ioremap registers\n");
414 ret = -ENXIO;
415 goto err3;
416 }
417
418 spdif_stereo_out.addr_width = 2;
419 spdif_stereo_out.addr = mem_res->start + DATA_OUTBUF;
420 filter = NULL;
421 if (spdif_pdata) {
422 spdif_stereo_out.filter_data = spdif_pdata->dma_playback;
423 filter = spdif_pdata->dma_filter;
424 }
425 spdif->dma_playback = &spdif_stereo_out;
426
427 ret = samsung_asoc_dma_platform_register(&pdev->dev, filter,
428 NULL, NULL, NULL);
429 if (ret) {
430 dev_err(&pdev->dev, "failed to register DMA: %d\n", ret);
431 goto err4;
432 }
433
434 dev_set_drvdata(&pdev->dev, spdif);
435
436 ret = devm_snd_soc_register_component(&pdev->dev,
437 &samsung_spdif_component, &samsung_spdif_dai, 1);
438 if (ret != 0) {
439 dev_err(&pdev->dev, "fail to register dai\n");
440 goto err4;
441 }
442
443 return 0;
444err4:
445 iounmap(spdif->regs);
446err3:
447 release_mem_region(mem_res->start, resource_size(mem_res));
448err2:
449 clk_disable_unprepare(spdif->sclk);
450err1:
451 clk_disable_unprepare(spdif->pclk);
452err0:
453 return ret;
454}
455
456static int spdif_remove(struct platform_device *pdev)
457{
458 struct samsung_spdif_info *spdif = &spdif_info;
459 struct resource *mem_res;
460
461 iounmap(spdif->regs);
462
463 mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
464 if (mem_res)
465 release_mem_region(mem_res->start, resource_size(mem_res));
466
467 clk_disable_unprepare(spdif->sclk);
468 clk_disable_unprepare(spdif->pclk);
469
470 return 0;
471}
472
473static struct platform_driver samsung_spdif_driver = {
474 .probe = spdif_probe,
475 .remove = spdif_remove,
476 .driver = {
477 .name = "samsung-spdif",
478 },
479};
480
481module_platform_driver(samsung_spdif_driver);
482
483MODULE_AUTHOR("Seungwhan Youn, <sw.youn@samsung.com>");
484MODULE_DESCRIPTION("Samsung S/PDIF Controller Driver");
485MODULE_LICENSE("GPL");
486MODULE_ALIAS("platform:samsung-spdif");
487
