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Commit | Line | Data |
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5033f43c | 1 | /* sound/soc/samsung/spdif.c |
fc127ccc SY |
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> | |
da155d5b | 15 | #include <linux/module.h> |
fc127ccc | 16 | |
fc127ccc | 17 | #include <sound/soc.h> |
0378b6ac | 18 | #include <sound/pcm_params.h> |
fc127ccc | 19 | |
436d42c6 | 20 | #include <linux/platform_data/asoc-s3c.h> |
fc127ccc | 21 | |
4b640cf3 | 22 | #include "dma.h" |
fc127ccc SY |
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 | ||
fc127ccc SY |
96 | static struct s3c_dma_params spdif_stereo_out; |
97 | static struct samsung_spdif_info spdif_info; | |
98 | ||
99 | static inline struct samsung_spdif_info *to_info(struct snd_soc_dai *cpu_dai) | |
100 | { | |
101 | return snd_soc_dai_get_drvdata(cpu_dai); | |
102 | } | |
103 | ||
104 | static void spdif_snd_txctrl(struct samsung_spdif_info *spdif, int on) | |
105 | { | |
106 | void __iomem *regs = spdif->regs; | |
107 | u32 clkcon; | |
108 | ||
109 | dev_dbg(spdif->dev, "Entered %s\n", __func__); | |
110 | ||
111 | clkcon = readl(regs + CLKCON) & CLKCTL_MASK; | |
112 | if (on) | |
113 | writel(clkcon | CLKCTL_PWR_ON, regs + CLKCON); | |
114 | else | |
115 | writel(clkcon & ~CLKCTL_PWR_ON, regs + CLKCON); | |
116 | } | |
117 | ||
118 | static int spdif_set_sysclk(struct snd_soc_dai *cpu_dai, | |
119 | int clk_id, unsigned int freq, int dir) | |
120 | { | |
121 | struct samsung_spdif_info *spdif = to_info(cpu_dai); | |
122 | u32 clkcon; | |
123 | ||
124 | dev_dbg(spdif->dev, "Entered %s\n", __func__); | |
125 | ||
126 | clkcon = readl(spdif->regs + CLKCON); | |
127 | ||
128 | if (clk_id == SND_SOC_SPDIF_INT_MCLK) | |
129 | clkcon &= ~CLKCTL_MCLK_EXT; | |
130 | else | |
131 | clkcon |= CLKCTL_MCLK_EXT; | |
132 | ||
133 | writel(clkcon, spdif->regs + CLKCON); | |
134 | ||
135 | spdif->clk_rate = freq; | |
136 | ||
137 | return 0; | |
138 | } | |
139 | ||
140 | static int spdif_trigger(struct snd_pcm_substream *substream, int cmd, | |
141 | struct snd_soc_dai *dai) | |
142 | { | |
143 | struct snd_soc_pcm_runtime *rtd = substream->private_data; | |
144 | struct samsung_spdif_info *spdif = to_info(rtd->cpu_dai); | |
145 | unsigned long flags; | |
146 | ||
147 | dev_dbg(spdif->dev, "Entered %s\n", __func__); | |
148 | ||
149 | switch (cmd) { | |
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); | |
156 | break; | |
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); | |
163 | break; | |
164 | default: | |
165 | return -EINVAL; | |
166 | } | |
167 | ||
168 | return 0; | |
169 | } | |
170 | ||
171 | static int spdif_sysclk_ratios[] = { | |
172 | 512, 384, 256, | |
173 | }; | |
174 | ||
175 | static int spdif_hw_params(struct snd_pcm_substream *substream, | |
176 | struct snd_pcm_hw_params *params, | |
177 | struct snd_soc_dai *socdai) | |
178 | { | |
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; | |
184 | unsigned long flags; | |
185 | int i, ratio; | |
186 | ||
187 | dev_dbg(spdif->dev, "Entered %s\n", __func__); | |
188 | ||
189 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) | |
190 | dma_data = spdif->dma_playback; | |
191 | else { | |
192 | dev_err(spdif->dev, "Capture is not supported\n"); | |
193 | return -EINVAL; | |
194 | } | |
195 | ||
196 | snd_soc_dai_set_dma_data(rtd->cpu_dai, substream, dma_data); | |
197 | ||
198 | spin_lock_irqsave(&spdif->lock, flags); | |
199 | ||
200 | con = readl(regs + CON) & CON_MASK; | |
201 | cstas = readl(regs + CSTAS) & CSTAS_MASK; | |
202 | clkcon = readl(regs + CLKCON) & CLKCTL_MASK; | |
203 | ||
204 | con &= ~CON_FIFO_TH_MASK; | |
205 | con |= (0x7 << CON_FIFO_TH_SHIFT); | |
206 | con |= CON_USERDATA_23RDBIT; | |
207 | con |= CON_PCM_DATA; | |
208 | ||
209 | con &= ~CON_PCM_MASK; | |
88ce1465 TB |
210 | switch (params_width(params)) { |
211 | case 16: | |
fc127ccc SY |
212 | con |= CON_PCM_16BIT; |
213 | break; | |
214 | default: | |
215 | dev_err(spdif->dev, "Unsupported data size.\n"); | |
216 | goto err; | |
217 | } | |
218 | ||
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]) | |
222 | break; | |
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)); | |
226 | goto err; | |
227 | } | |
228 | ||
229 | con &= ~CON_MCLKDIV_MASK; | |
230 | switch (ratio) { | |
231 | case 256: | |
232 | con |= CON_MCLKDIV_256FS; | |
233 | break; | |
234 | case 384: | |
235 | con |= CON_MCLKDIV_384FS; | |
236 | break; | |
237 | case 512: | |
238 | con |= CON_MCLKDIV_512FS; | |
239 | break; | |
240 | } | |
241 | ||
242 | cstas &= ~CSTAS_SAMP_FREQ_MASK; | |
243 | switch (params_rate(params)) { | |
244 | case 44100: | |
245 | cstas |= CSTAS_SAMP_FREQ_44; | |
246 | break; | |
247 | case 48000: | |
248 | cstas |= CSTAS_SAMP_FREQ_48; | |
249 | break; | |
250 | case 32000: | |
251 | cstas |= CSTAS_SAMP_FREQ_32; | |
252 | break; | |
253 | case 96000: | |
254 | cstas |= CSTAS_SAMP_FREQ_96; | |
255 | break; | |
256 | default: | |
257 | dev_err(spdif->dev, "Invalid sampling rate %d\n", | |
258 | params_rate(params)); | |
259 | goto err; | |
260 | } | |
261 | ||
262 | cstas &= ~CSTAS_CATEGORY_MASK; | |
263 | cstas |= CSTAS_CATEGORY_CODE_CDP; | |
264 | cstas |= CSTAS_NO_COPYRIGHT; | |
265 | ||
266 | writel(con, regs + CON); | |
267 | writel(cstas, regs + CSTAS); | |
268 | writel(clkcon, regs + CLKCON); | |
269 | ||
270 | spin_unlock_irqrestore(&spdif->lock, flags); | |
271 | ||
272 | return 0; | |
273 | err: | |
274 | spin_unlock_irqrestore(&spdif->lock, flags); | |
275 | return -EINVAL; | |
276 | } | |
277 | ||
278 | static void spdif_shutdown(struct snd_pcm_substream *substream, | |
279 | struct snd_soc_dai *dai) | |
280 | { | |
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; | |
284 | u32 con, clkcon; | |
285 | ||
286 | dev_dbg(spdif->dev, "Entered %s\n", __func__); | |
287 | ||
288 | con = readl(regs + CON) & CON_MASK; | |
289 | clkcon = readl(regs + CLKCON) & CLKCTL_MASK; | |
290 | ||
291 | writel(con | CON_SW_RESET, regs + CON); | |
292 | cpu_relax(); | |
293 | ||
294 | writel(clkcon & ~CLKCTL_PWR_ON, regs + CLKCON); | |
295 | } | |
296 | ||
297 | #ifdef CONFIG_PM | |
298 | static int spdif_suspend(struct snd_soc_dai *cpu_dai) | |
299 | { | |
300 | struct samsung_spdif_info *spdif = to_info(cpu_dai); | |
301 | u32 con = spdif->saved_con; | |
302 | ||
303 | dev_dbg(spdif->dev, "Entered %s\n", __func__); | |
304 | ||
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; | |
308 | ||
309 | writel(con | CON_SW_RESET, spdif->regs + CON); | |
310 | cpu_relax(); | |
311 | ||
312 | return 0; | |
313 | } | |
314 | ||
315 | static int spdif_resume(struct snd_soc_dai *cpu_dai) | |
316 | { | |
317 | struct samsung_spdif_info *spdif = to_info(cpu_dai); | |
318 | ||
319 | dev_dbg(spdif->dev, "Entered %s\n", __func__); | |
320 | ||
321 | writel(spdif->saved_clkcon, spdif->regs + CLKCON); | |
322 | writel(spdif->saved_con, spdif->regs + CON); | |
323 | writel(spdif->saved_cstas, spdif->regs + CSTAS); | |
324 | ||
325 | return 0; | |
326 | } | |
327 | #else | |
328 | #define spdif_suspend NULL | |
329 | #define spdif_resume NULL | |
330 | #endif | |
331 | ||
85e7652d | 332 | static const struct snd_soc_dai_ops spdif_dai_ops = { |
fc127ccc SY |
333 | .set_sysclk = spdif_set_sysclk, |
334 | .trigger = spdif_trigger, | |
335 | .hw_params = spdif_hw_params, | |
336 | .shutdown = spdif_shutdown, | |
337 | }; | |
338 | ||
bc6bd90e | 339 | static struct snd_soc_dai_driver samsung_spdif_dai = { |
fc127ccc SY |
340 | .name = "samsung-spdif", |
341 | .playback = { | |
342 | .stream_name = "S/PDIF Playback", | |
343 | .channels_min = 2, | |
344 | .channels_max = 2, | |
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, | |
353 | }; | |
354 | ||
c3764d8b KM |
355 | static const struct snd_soc_component_driver samsung_spdif_component = { |
356 | .name = "samsung-spdif", | |
357 | }; | |
358 | ||
fdca21ad | 359 | static int spdif_probe(struct platform_device *pdev) |
fc127ccc SY |
360 | { |
361 | struct s3c_audio_pdata *spdif_pdata; | |
b9a1a743 | 362 | struct resource *mem_res; |
fc127ccc | 363 | struct samsung_spdif_info *spdif; |
9bdca822 | 364 | dma_filter_fn filter; |
fc127ccc SY |
365 | int ret; |
366 | ||
367 | spdif_pdata = pdev->dev.platform_data; | |
368 | ||
369 | dev_dbg(&pdev->dev, "Entered %s\n", __func__); | |
370 | ||
fc127ccc SY |
371 | mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
372 | if (!mem_res) { | |
373 | dev_err(&pdev->dev, "Unable to get register resource.\n"); | |
374 | return -ENXIO; | |
375 | } | |
376 | ||
377 | if (spdif_pdata && spdif_pdata->cfg_gpio | |
378 | && spdif_pdata->cfg_gpio(pdev)) { | |
379 | dev_err(&pdev->dev, "Unable to configure GPIO pins\n"); | |
380 | return -EINVAL; | |
381 | } | |
382 | ||
383 | spdif = &spdif_info; | |
384 | spdif->dev = &pdev->dev; | |
385 | ||
386 | spin_lock_init(&spdif->lock); | |
387 | ||
7497185f | 388 | spdif->pclk = devm_clk_get(&pdev->dev, "spdif"); |
fc127ccc SY |
389 | if (IS_ERR(spdif->pclk)) { |
390 | dev_err(&pdev->dev, "failed to get peri-clock\n"); | |
391 | ret = -ENOENT; | |
392 | goto err0; | |
393 | } | |
9d01e9b2 | 394 | clk_prepare_enable(spdif->pclk); |
fc127ccc | 395 | |
7497185f | 396 | spdif->sclk = devm_clk_get(&pdev->dev, "sclk_spdif"); |
fc127ccc SY |
397 | if (IS_ERR(spdif->sclk)) { |
398 | dev_err(&pdev->dev, "failed to get internal source clock\n"); | |
399 | ret = -ENOENT; | |
400 | goto err1; | |
401 | } | |
9d01e9b2 | 402 | clk_prepare_enable(spdif->sclk); |
fc127ccc SY |
403 | |
404 | /* Request S/PDIF Register's memory region */ | |
405 | if (!request_mem_region(mem_res->start, | |
406 | resource_size(mem_res), "samsung-spdif")) { | |
407 | dev_err(&pdev->dev, "Unable to request register region\n"); | |
408 | ret = -EBUSY; | |
409 | goto err2; | |
410 | } | |
411 | ||
412 | spdif->regs = ioremap(mem_res->start, 0x100); | |
413 | if (spdif->regs == NULL) { | |
414 | dev_err(&pdev->dev, "Cannot ioremap registers\n"); | |
415 | ret = -ENXIO; | |
416 | goto err3; | |
417 | } | |
418 | ||
419 | dev_set_drvdata(&pdev->dev, spdif); | |
420 | ||
7253e354 TB |
421 | ret = devm_snd_soc_register_component(&pdev->dev, |
422 | &samsung_spdif_component, &samsung_spdif_dai, 1); | |
fc127ccc SY |
423 | if (ret != 0) { |
424 | dev_err(&pdev->dev, "fail to register dai\n"); | |
425 | goto err4; | |
426 | } | |
427 | ||
428 | spdif_stereo_out.dma_size = 2; | |
fc127ccc | 429 | spdif_stereo_out.dma_addr = mem_res->start + DATA_OUTBUF; |
9bdca822 AB |
430 | filter = NULL; |
431 | if (spdif_pdata) { | |
432 | spdif_stereo_out.slave = spdif_pdata->dma_playback; | |
433 | filter = spdif_pdata->dma_filter; | |
434 | } | |
fc127ccc SY |
435 | |
436 | spdif->dma_playback = &spdif_stereo_out; | |
437 | ||
9bdca822 | 438 | ret = samsung_asoc_dma_platform_register(&pdev->dev, filter); |
a08485d8 PV |
439 | if (ret) { |
440 | dev_err(&pdev->dev, "failed to register DMA: %d\n", ret); | |
7253e354 | 441 | goto err4; |
a08485d8 | 442 | } |
fc127ccc | 443 | |
a08485d8 | 444 | return 0; |
fc127ccc SY |
445 | err4: |
446 | iounmap(spdif->regs); | |
447 | err3: | |
448 | release_mem_region(mem_res->start, resource_size(mem_res)); | |
449 | err2: | |
9d01e9b2 | 450 | clk_disable_unprepare(spdif->sclk); |
fc127ccc | 451 | err1: |
9d01e9b2 | 452 | clk_disable_unprepare(spdif->pclk); |
fc127ccc SY |
453 | err0: |
454 | return ret; | |
455 | } | |
456 | ||
fdca21ad | 457 | static int spdif_remove(struct platform_device *pdev) |
fc127ccc SY |
458 | { |
459 | struct samsung_spdif_info *spdif = &spdif_info; | |
460 | struct resource *mem_res; | |
461 | ||
fc127ccc SY |
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 | ||
9d01e9b2 | 468 | clk_disable_unprepare(spdif->sclk); |
9d01e9b2 | 469 | clk_disable_unprepare(spdif->pclk); |
fc127ccc SY |
470 | |
471 | return 0; | |
472 | } | |
473 | ||
474 | static struct platform_driver samsung_spdif_driver = { | |
475 | .probe = spdif_probe, | |
fdca21ad | 476 | .remove = spdif_remove, |
fc127ccc SY |
477 | .driver = { |
478 | .name = "samsung-spdif", | |
fc127ccc SY |
479 | }, |
480 | }; | |
481 | ||
e00c3f55 | 482 | module_platform_driver(samsung_spdif_driver); |
fc127ccc SY |
483 | |
484 | MODULE_AUTHOR("Seungwhan Youn, <sw.youn@samsung.com>"); | |
485 | MODULE_DESCRIPTION("Samsung S/PDIF Controller Driver"); | |
486 | MODULE_LICENSE("GPL"); | |
487 | MODULE_ALIAS("platform:samsung-spdif"); |