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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 | ||
16 | #include <sound/soc.h> | |
17 | #include <sound/pcm_params.h> | |
18 | ||
19 | #include <plat/audio.h> | |
20 | #include <mach/dma.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 s3c2410_dma_client spdif_dma_client_out = { | |
97 | .name = "S/PDIF Stereo out", | |
98 | }; | |
99 | ||
100 | static struct s3c_dma_params spdif_stereo_out; | |
101 | static struct samsung_spdif_info spdif_info; | |
102 | ||
103 | static inline struct samsung_spdif_info *to_info(struct snd_soc_dai *cpu_dai) | |
104 | { | |
105 | return snd_soc_dai_get_drvdata(cpu_dai); | |
106 | } | |
107 | ||
108 | static void spdif_snd_txctrl(struct samsung_spdif_info *spdif, int on) | |
109 | { | |
110 | void __iomem *regs = spdif->regs; | |
111 | u32 clkcon; | |
112 | ||
113 | dev_dbg(spdif->dev, "Entered %s\n", __func__); | |
114 | ||
115 | clkcon = readl(regs + CLKCON) & CLKCTL_MASK; | |
116 | if (on) | |
117 | writel(clkcon | CLKCTL_PWR_ON, regs + CLKCON); | |
118 | else | |
119 | writel(clkcon & ~CLKCTL_PWR_ON, regs + CLKCON); | |
120 | } | |
121 | ||
122 | static int spdif_set_sysclk(struct snd_soc_dai *cpu_dai, | |
123 | int clk_id, unsigned int freq, int dir) | |
124 | { | |
125 | struct samsung_spdif_info *spdif = to_info(cpu_dai); | |
126 | u32 clkcon; | |
127 | ||
128 | dev_dbg(spdif->dev, "Entered %s\n", __func__); | |
129 | ||
130 | clkcon = readl(spdif->regs + CLKCON); | |
131 | ||
132 | if (clk_id == SND_SOC_SPDIF_INT_MCLK) | |
133 | clkcon &= ~CLKCTL_MCLK_EXT; | |
134 | else | |
135 | clkcon |= CLKCTL_MCLK_EXT; | |
136 | ||
137 | writel(clkcon, spdif->regs + CLKCON); | |
138 | ||
139 | spdif->clk_rate = freq; | |
140 | ||
141 | return 0; | |
142 | } | |
143 | ||
144 | static int spdif_trigger(struct snd_pcm_substream *substream, int cmd, | |
145 | struct snd_soc_dai *dai) | |
146 | { | |
147 | struct snd_soc_pcm_runtime *rtd = substream->private_data; | |
148 | struct samsung_spdif_info *spdif = to_info(rtd->cpu_dai); | |
149 | unsigned long flags; | |
150 | ||
151 | dev_dbg(spdif->dev, "Entered %s\n", __func__); | |
152 | ||
153 | switch (cmd) { | |
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); | |
160 | break; | |
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); | |
167 | break; | |
168 | default: | |
169 | return -EINVAL; | |
170 | } | |
171 | ||
172 | return 0; | |
173 | } | |
174 | ||
175 | static int spdif_sysclk_ratios[] = { | |
176 | 512, 384, 256, | |
177 | }; | |
178 | ||
179 | static int spdif_hw_params(struct snd_pcm_substream *substream, | |
180 | struct snd_pcm_hw_params *params, | |
181 | struct snd_soc_dai *socdai) | |
182 | { | |
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; | |
188 | unsigned long flags; | |
189 | int i, ratio; | |
190 | ||
191 | dev_dbg(spdif->dev, "Entered %s\n", __func__); | |
192 | ||
193 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) | |
194 | dma_data = spdif->dma_playback; | |
195 | else { | |
196 | dev_err(spdif->dev, "Capture is not supported\n"); | |
197 | return -EINVAL; | |
198 | } | |
199 | ||
200 | snd_soc_dai_set_dma_data(rtd->cpu_dai, substream, dma_data); | |
201 | ||
202 | spin_lock_irqsave(&spdif->lock, flags); | |
203 | ||
204 | con = readl(regs + CON) & CON_MASK; | |
205 | cstas = readl(regs + CSTAS) & CSTAS_MASK; | |
206 | clkcon = readl(regs + CLKCON) & CLKCTL_MASK; | |
207 | ||
208 | con &= ~CON_FIFO_TH_MASK; | |
209 | con |= (0x7 << CON_FIFO_TH_SHIFT); | |
210 | con |= CON_USERDATA_23RDBIT; | |
211 | con |= CON_PCM_DATA; | |
212 | ||
213 | con &= ~CON_PCM_MASK; | |
214 | switch (params_format(params)) { | |
215 | case SNDRV_PCM_FORMAT_S16_LE: | |
216 | con |= CON_PCM_16BIT; | |
217 | break; | |
218 | default: | |
219 | dev_err(spdif->dev, "Unsupported data size.\n"); | |
220 | goto err; | |
221 | } | |
222 | ||
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]) | |
226 | break; | |
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)); | |
230 | goto err; | |
231 | } | |
232 | ||
233 | con &= ~CON_MCLKDIV_MASK; | |
234 | switch (ratio) { | |
235 | case 256: | |
236 | con |= CON_MCLKDIV_256FS; | |
237 | break; | |
238 | case 384: | |
239 | con |= CON_MCLKDIV_384FS; | |
240 | break; | |
241 | case 512: | |
242 | con |= CON_MCLKDIV_512FS; | |
243 | break; | |
244 | } | |
245 | ||
246 | cstas &= ~CSTAS_SAMP_FREQ_MASK; | |
247 | switch (params_rate(params)) { | |
248 | case 44100: | |
249 | cstas |= CSTAS_SAMP_FREQ_44; | |
250 | break; | |
251 | case 48000: | |
252 | cstas |= CSTAS_SAMP_FREQ_48; | |
253 | break; | |
254 | case 32000: | |
255 | cstas |= CSTAS_SAMP_FREQ_32; | |
256 | break; | |
257 | case 96000: | |
258 | cstas |= CSTAS_SAMP_FREQ_96; | |
259 | break; | |
260 | default: | |
261 | dev_err(spdif->dev, "Invalid sampling rate %d\n", | |
262 | params_rate(params)); | |
263 | goto err; | |
264 | } | |
265 | ||
266 | cstas &= ~CSTAS_CATEGORY_MASK; | |
267 | cstas |= CSTAS_CATEGORY_CODE_CDP; | |
268 | cstas |= CSTAS_NO_COPYRIGHT; | |
269 | ||
270 | writel(con, regs + CON); | |
271 | writel(cstas, regs + CSTAS); | |
272 | writel(clkcon, regs + CLKCON); | |
273 | ||
274 | spin_unlock_irqrestore(&spdif->lock, flags); | |
275 | ||
276 | return 0; | |
277 | err: | |
278 | spin_unlock_irqrestore(&spdif->lock, flags); | |
279 | return -EINVAL; | |
280 | } | |
281 | ||
282 | static void spdif_shutdown(struct snd_pcm_substream *substream, | |
283 | struct snd_soc_dai *dai) | |
284 | { | |
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; | |
288 | u32 con, clkcon; | |
289 | ||
290 | dev_dbg(spdif->dev, "Entered %s\n", __func__); | |
291 | ||
292 | con = readl(regs + CON) & CON_MASK; | |
293 | clkcon = readl(regs + CLKCON) & CLKCTL_MASK; | |
294 | ||
295 | writel(con | CON_SW_RESET, regs + CON); | |
296 | cpu_relax(); | |
297 | ||
298 | writel(clkcon & ~CLKCTL_PWR_ON, regs + CLKCON); | |
299 | } | |
300 | ||
301 | #ifdef CONFIG_PM | |
302 | static int spdif_suspend(struct snd_soc_dai *cpu_dai) | |
303 | { | |
304 | struct samsung_spdif_info *spdif = to_info(cpu_dai); | |
305 | u32 con = spdif->saved_con; | |
306 | ||
307 | dev_dbg(spdif->dev, "Entered %s\n", __func__); | |
308 | ||
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; | |
312 | ||
313 | writel(con | CON_SW_RESET, spdif->regs + CON); | |
314 | cpu_relax(); | |
315 | ||
316 | return 0; | |
317 | } | |
318 | ||
319 | static int spdif_resume(struct snd_soc_dai *cpu_dai) | |
320 | { | |
321 | struct samsung_spdif_info *spdif = to_info(cpu_dai); | |
322 | ||
323 | dev_dbg(spdif->dev, "Entered %s\n", __func__); | |
324 | ||
325 | writel(spdif->saved_clkcon, spdif->regs + CLKCON); | |
326 | writel(spdif->saved_con, spdif->regs + CON); | |
327 | writel(spdif->saved_cstas, spdif->regs + CSTAS); | |
328 | ||
329 | return 0; | |
330 | } | |
331 | #else | |
332 | #define spdif_suspend NULL | |
333 | #define spdif_resume NULL | |
334 | #endif | |
335 | ||
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, | |
341 | }; | |
342 | ||
343 | struct snd_soc_dai_driver samsung_spdif_dai = { | |
344 | .name = "samsung-spdif", | |
345 | .playback = { | |
346 | .stream_name = "S/PDIF Playback", | |
347 | .channels_min = 2, | |
348 | .channels_max = 2, | |
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, | |
357 | }; | |
358 | ||
359 | static __devinit 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 = 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_enable(spdif->pclk); | |
400 | ||
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"); | |
404 | ret = -ENOENT; | |
405 | goto err1; | |
406 | } | |
407 | clk_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 = snd_soc_register_dai(&pdev->dev, &samsung_spdif_dai); | |
427 | if (ret != 0) { | |
428 | dev_err(&pdev->dev, "fail to register dai\n"); | |
429 | goto err4; | |
430 | } | |
431 | ||
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; | |
436 | ||
437 | spdif->dma_playback = &spdif_stereo_out; | |
438 | ||
439 | return 0; | |
440 | ||
441 | err4: | |
442 | iounmap(spdif->regs); | |
443 | err3: | |
444 | release_mem_region(mem_res->start, resource_size(mem_res)); | |
445 | err2: | |
446 | clk_disable(spdif->sclk); | |
447 | clk_put(spdif->sclk); | |
448 | err1: | |
449 | clk_disable(spdif->pclk); | |
450 | clk_put(spdif->pclk); | |
451 | err0: | |
452 | return ret; | |
453 | } | |
454 | ||
455 | static __devexit int spdif_remove(struct platform_device *pdev) | |
456 | { | |
457 | struct samsung_spdif_info *spdif = &spdif_info; | |
458 | struct resource *mem_res; | |
459 | ||
460 | snd_soc_unregister_dai(&pdev->dev); | |
461 | ||
462 | iounmap(spdif->regs); | |
463 | ||
464 | mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
465 | if (mem_res) | |
466 | release_mem_region(mem_res->start, resource_size(mem_res)); | |
467 | ||
468 | clk_disable(spdif->sclk); | |
469 | clk_put(spdif->sclk); | |
470 | clk_disable(spdif->pclk); | |
471 | clk_put(spdif->pclk); | |
472 | ||
473 | return 0; | |
474 | } | |
475 | ||
476 | static struct platform_driver samsung_spdif_driver = { | |
477 | .probe = spdif_probe, | |
478 | .remove = spdif_remove, | |
479 | .driver = { | |
480 | .name = "samsung-spdif", | |
481 | .owner = THIS_MODULE, | |
482 | }, | |
483 | }; | |
484 | ||
485 | static int __init spdif_init(void) | |
486 | { | |
487 | return platform_driver_register(&samsung_spdif_driver); | |
488 | } | |
489 | module_init(spdif_init); | |
490 | ||
491 | static void __exit spdif_exit(void) | |
492 | { | |
493 | platform_driver_unregister(&samsung_spdif_driver); | |
494 | } | |
495 | module_exit(spdif_exit); | |
496 | ||
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"); |