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c1422a66 BD |
1 | /* |
2 | * s3c24xx-i2s.c -- ALSA Soc Audio Layer | |
3 | * | |
4 | * (c) 2006 Wolfson Microelectronics PLC. | |
5 | * Graeme Gregory graeme.gregory@wolfsonmicro.com or linux@wolfsonmicro.com | |
6 | * | |
7 | * (c) 2004-2005 Simtec Electronics | |
8 | * http://armlinux.simtec.co.uk/ | |
9 | * Ben Dooks <ben@simtec.co.uk> | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify it | |
12 | * under the terms of the GNU General Public License as published by the | |
13 | * Free Software Foundation; either version 2 of the License, or (at your | |
14 | * option) any later version. | |
15 | * | |
16 | * | |
17 | * Revision history | |
18 | * 11th Dec 2006 Merged with Simtec driver | |
19 | * 10th Nov 2006 Initial version. | |
20 | */ | |
21 | ||
22 | #include <linux/init.h> | |
23 | #include <linux/module.h> | |
24 | #include <linux/device.h> | |
25 | #include <linux/delay.h> | |
26 | #include <linux/clk.h> | |
27 | #include <sound/driver.h> | |
28 | #include <sound/core.h> | |
29 | #include <sound/pcm.h> | |
30 | #include <sound/pcm_params.h> | |
31 | #include <sound/initval.h> | |
32 | #include <sound/soc.h> | |
33 | ||
34 | #include <asm/hardware.h> | |
35 | #include <asm/io.h> | |
36 | #include <asm/arch/regs-iis.h> | |
37 | #include <asm/arch/regs-gpio.h> | |
38 | #include <asm/arch/regs-clock.h> | |
39 | #include <asm/arch/audio.h> | |
40 | #include <asm/dma.h> | |
41 | #include <asm/arch/dma.h> | |
42 | ||
43 | #include "s3c24xx-pcm.h" | |
44 | #include "s3c24xx-i2s.h" | |
45 | ||
46 | #define S3C24XX_I2S_DEBUG 0 | |
47 | #if S3C24XX_I2S_DEBUG | |
48 | #define DBG(x...) printk(KERN_DEBUG x) | |
49 | #else | |
50 | #define DBG(x...) | |
51 | #endif | |
52 | ||
53 | static struct s3c2410_dma_client s3c24xx_dma_client_out = { | |
54 | .name = "I2S PCM Stereo out" | |
55 | }; | |
56 | ||
57 | static struct s3c2410_dma_client s3c24xx_dma_client_in = { | |
58 | .name = "I2S PCM Stereo in" | |
59 | }; | |
60 | ||
61 | static struct s3c24xx_pcm_dma_params s3c24xx_i2s_pcm_stereo_out = { | |
62 | .client = &s3c24xx_dma_client_out, | |
63 | .channel = DMACH_I2S_OUT, | |
e81208fe GG |
64 | .dma_addr = S3C2410_PA_IIS + S3C2410_IISFIFO, |
65 | .dma_size = 2, | |
c1422a66 BD |
66 | }; |
67 | ||
68 | static struct s3c24xx_pcm_dma_params s3c24xx_i2s_pcm_stereo_in = { | |
69 | .client = &s3c24xx_dma_client_in, | |
70 | .channel = DMACH_I2S_IN, | |
e81208fe GG |
71 | .dma_addr = S3C2410_PA_IIS + S3C2410_IISFIFO, |
72 | .dma_size = 2, | |
c1422a66 BD |
73 | }; |
74 | ||
75 | struct s3c24xx_i2s_info { | |
76 | void __iomem *regs; | |
77 | struct clk *iis_clk; | |
78 | }; | |
79 | static struct s3c24xx_i2s_info s3c24xx_i2s; | |
80 | ||
81 | static void s3c24xx_snd_txctrl(int on) | |
82 | { | |
83 | u32 iisfcon; | |
84 | u32 iiscon; | |
85 | u32 iismod; | |
86 | ||
87 | DBG("Entered %s\n", __FUNCTION__); | |
88 | ||
89 | iisfcon = readl(s3c24xx_i2s.regs + S3C2410_IISFCON); | |
90 | iiscon = readl(s3c24xx_i2s.regs + S3C2410_IISCON); | |
91 | iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD); | |
92 | ||
93 | DBG("r: IISCON: %lx IISMOD: %lx IISFCON: %lx\n", iiscon, iismod, iisfcon); | |
94 | ||
95 | if (on) { | |
96 | iisfcon |= S3C2410_IISFCON_TXDMA | S3C2410_IISFCON_TXENABLE; | |
97 | iiscon |= S3C2410_IISCON_TXDMAEN | S3C2410_IISCON_IISEN; | |
98 | iiscon &= ~S3C2410_IISCON_TXIDLE; | |
99 | iismod |= S3C2410_IISMOD_TXMODE; | |
100 | ||
101 | writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD); | |
102 | writel(iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON); | |
103 | writel(iiscon, s3c24xx_i2s.regs + S3C2410_IISCON); | |
104 | } else { | |
105 | /* note, we have to disable the FIFOs otherwise bad things | |
106 | * seem to happen when the DMA stops. According to the | |
107 | * Samsung supplied kernel, this should allow the DMA | |
108 | * engine and FIFOs to reset. If this isn't allowed, the | |
109 | * DMA engine will simply freeze randomly. | |
110 | */ | |
111 | ||
112 | iisfcon &= ~S3C2410_IISFCON_TXENABLE; | |
113 | iisfcon &= ~S3C2410_IISFCON_TXDMA; | |
114 | iiscon |= S3C2410_IISCON_TXIDLE; | |
115 | iiscon &= ~S3C2410_IISCON_TXDMAEN; | |
116 | iismod &= ~S3C2410_IISMOD_TXMODE; | |
117 | ||
118 | writel(iiscon, s3c24xx_i2s.regs + S3C2410_IISCON); | |
119 | writel(iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON); | |
120 | writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD); | |
121 | } | |
122 | ||
123 | DBG("w: IISCON: %lx IISMOD: %lx IISFCON: %lx\n", iiscon, iismod, iisfcon); | |
124 | } | |
125 | ||
126 | static void s3c24xx_snd_rxctrl(int on) | |
127 | { | |
128 | u32 iisfcon; | |
129 | u32 iiscon; | |
130 | u32 iismod; | |
131 | ||
132 | DBG("Entered %s\n", __FUNCTION__); | |
133 | ||
134 | iisfcon = readl(s3c24xx_i2s.regs + S3C2410_IISFCON); | |
135 | iiscon = readl(s3c24xx_i2s.regs + S3C2410_IISCON); | |
136 | iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD); | |
137 | ||
138 | DBG("r: IISCON: %lx IISMOD: %lx IISFCON: %lx\n", iiscon, iismod, iisfcon); | |
139 | ||
140 | if (on) { | |
141 | iisfcon |= S3C2410_IISFCON_RXDMA | S3C2410_IISFCON_RXENABLE; | |
142 | iiscon |= S3C2410_IISCON_RXDMAEN | S3C2410_IISCON_IISEN; | |
143 | iiscon &= ~S3C2410_IISCON_RXIDLE; | |
144 | iismod |= S3C2410_IISMOD_RXMODE; | |
145 | ||
146 | writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD); | |
147 | writel(iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON); | |
148 | writel(iiscon, s3c24xx_i2s.regs + S3C2410_IISCON); | |
149 | } else { | |
150 | /* note, we have to disable the FIFOs otherwise bad things | |
151 | * seem to happen when the DMA stops. According to the | |
152 | * Samsung supplied kernel, this should allow the DMA | |
153 | * engine and FIFOs to reset. If this isn't allowed, the | |
154 | * DMA engine will simply freeze randomly. | |
155 | */ | |
156 | ||
157 | iisfcon &= ~S3C2410_IISFCON_RXENABLE; | |
158 | iisfcon &= ~S3C2410_IISFCON_RXDMA; | |
159 | iiscon |= S3C2410_IISCON_RXIDLE; | |
160 | iiscon &= ~S3C2410_IISCON_RXDMAEN; | |
161 | iismod &= ~S3C2410_IISMOD_RXMODE; | |
162 | ||
163 | writel(iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON); | |
164 | writel(iiscon, s3c24xx_i2s.regs + S3C2410_IISCON); | |
165 | writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD); | |
166 | } | |
167 | ||
168 | DBG("w: IISCON: %lx IISMOD: %lx IISFCON: %lx\n", iiscon, iismod, iisfcon); | |
169 | } | |
170 | ||
171 | /* | |
172 | * Wait for the LR signal to allow synchronisation to the L/R clock | |
173 | * from the codec. May only be needed for slave mode. | |
174 | */ | |
175 | static int s3c24xx_snd_lrsync(void) | |
176 | { | |
177 | u32 iiscon; | |
178 | unsigned long timeout = jiffies + msecs_to_jiffies(5); | |
179 | ||
180 | DBG("Entered %s\n", __FUNCTION__); | |
181 | ||
182 | while (1) { | |
183 | iiscon = readl(s3c24xx_i2s.regs + S3C2410_IISCON); | |
184 | if (iiscon & S3C2410_IISCON_LRINDEX) | |
185 | break; | |
186 | ||
187 | if (timeout < jiffies) | |
188 | return -ETIMEDOUT; | |
189 | } | |
190 | ||
191 | return 0; | |
192 | } | |
193 | ||
194 | /* | |
195 | * Check whether CPU is the master or slave | |
196 | */ | |
197 | static inline int s3c24xx_snd_is_clkmaster(void) | |
198 | { | |
199 | DBG("Entered %s\n", __FUNCTION__); | |
200 | ||
201 | return (readl(s3c24xx_i2s.regs + S3C2410_IISMOD) & S3C2410_IISMOD_SLAVE) ? 0:1; | |
202 | } | |
203 | ||
204 | /* | |
205 | * Set S3C24xx I2S DAI format | |
206 | */ | |
207 | static int s3c24xx_i2s_set_fmt(struct snd_soc_cpu_dai *cpu_dai, | |
208 | unsigned int fmt) | |
209 | { | |
210 | u32 iismod; | |
211 | ||
212 | DBG("Entered %s\n", __FUNCTION__); | |
213 | ||
214 | iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD); | |
215 | DBG("hw_params r: IISMOD: %lx \n", iismod); | |
216 | ||
217 | switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) { | |
218 | case SND_SOC_DAIFMT_CBM_CFM: | |
219 | iismod |= S3C2410_IISMOD_SLAVE; | |
220 | break; | |
221 | case SND_SOC_DAIFMT_CBS_CFS: | |
222 | break; | |
223 | default: | |
224 | return -EINVAL; | |
225 | } | |
226 | ||
227 | switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) { | |
228 | case SND_SOC_DAIFMT_LEFT_J: | |
229 | iismod |= S3C2410_IISMOD_MSB; | |
230 | break; | |
231 | case SND_SOC_DAIFMT_I2S: | |
232 | break; | |
233 | default: | |
234 | return -EINVAL; | |
235 | } | |
236 | ||
237 | writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD); | |
238 | DBG("hw_params w: IISMOD: %lx \n", iismod); | |
239 | return 0; | |
240 | } | |
241 | ||
242 | static int s3c24xx_i2s_hw_params(struct snd_pcm_substream *substream, | |
243 | struct snd_pcm_hw_params *params) | |
244 | { | |
245 | struct snd_soc_pcm_runtime *rtd = substream->private_data; | |
246 | u32 iismod; | |
247 | ||
248 | DBG("Entered %s\n", __FUNCTION__); | |
249 | ||
250 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) | |
251 | rtd->dai->cpu_dai->dma_data = &s3c24xx_i2s_pcm_stereo_out; | |
252 | else | |
253 | rtd->dai->cpu_dai->dma_data = &s3c24xx_i2s_pcm_stereo_in; | |
254 | ||
255 | /* Working copies of register */ | |
256 | iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD); | |
257 | DBG("hw_params r: IISMOD: %lx\n", iismod); | |
258 | ||
259 | switch (params_format(params)) { | |
260 | case SNDRV_PCM_FORMAT_S8: | |
261 | break; | |
262 | case SNDRV_PCM_FORMAT_S16_LE: | |
263 | iismod |= S3C2410_IISMOD_16BIT; | |
264 | break; | |
265 | } | |
266 | ||
267 | writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD); | |
268 | DBG("hw_params w: IISMOD: %lx\n", iismod); | |
269 | return 0; | |
270 | } | |
271 | ||
272 | static int s3c24xx_i2s_trigger(struct snd_pcm_substream *substream, int cmd) | |
273 | { | |
274 | int ret = 0; | |
275 | ||
276 | DBG("Entered %s\n", __FUNCTION__); | |
277 | ||
278 | switch (cmd) { | |
279 | case SNDRV_PCM_TRIGGER_START: | |
280 | case SNDRV_PCM_TRIGGER_RESUME: | |
281 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: | |
282 | if (!s3c24xx_snd_is_clkmaster()) { | |
283 | ret = s3c24xx_snd_lrsync(); | |
284 | if (ret) | |
285 | goto exit_err; | |
286 | } | |
287 | ||
288 | if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) | |
289 | s3c24xx_snd_rxctrl(1); | |
290 | else | |
291 | s3c24xx_snd_txctrl(1); | |
292 | break; | |
293 | case SNDRV_PCM_TRIGGER_STOP: | |
294 | case SNDRV_PCM_TRIGGER_SUSPEND: | |
295 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: | |
296 | if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) | |
297 | s3c24xx_snd_rxctrl(0); | |
298 | else | |
299 | s3c24xx_snd_txctrl(0); | |
300 | break; | |
301 | default: | |
302 | ret = -EINVAL; | |
303 | break; | |
304 | } | |
305 | ||
306 | exit_err: | |
307 | return ret; | |
308 | } | |
309 | ||
310 | /* | |
311 | * Set S3C24xx Clock source | |
312 | */ | |
313 | static int s3c24xx_i2s_set_sysclk(struct snd_soc_cpu_dai *cpu_dai, | |
314 | int clk_id, unsigned int freq, int dir) | |
315 | { | |
316 | u32 iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD); | |
317 | ||
318 | DBG("Entered %s\n", __FUNCTION__); | |
319 | ||
320 | iismod &= ~S3C2440_IISMOD_MPLL; | |
321 | ||
322 | switch (clk_id) { | |
323 | case S3C24XX_CLKSRC_PCLK: | |
324 | break; | |
325 | case S3C24XX_CLKSRC_MPLL: | |
326 | iismod |= S3C2440_IISMOD_MPLL; | |
327 | break; | |
328 | default: | |
329 | return -EINVAL; | |
330 | } | |
331 | ||
332 | writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD); | |
333 | return 0; | |
334 | } | |
335 | ||
336 | /* | |
337 | * Set S3C24xx Clock dividers | |
338 | */ | |
339 | static int s3c24xx_i2s_set_clkdiv(struct snd_soc_cpu_dai *cpu_dai, | |
340 | int div_id, int div) | |
341 | { | |
342 | u32 reg; | |
343 | ||
344 | DBG("Entered %s\n", __FUNCTION__); | |
345 | ||
346 | switch (div_id) { | |
347 | case S3C24XX_DIV_MCLK: | |
348 | reg = readl(s3c24xx_i2s.regs + S3C2410_IISMOD) & ~S3C2410_IISMOD_FS_MASK; | |
349 | writel(reg | div, s3c24xx_i2s.regs + S3C2410_IISMOD); | |
350 | break; | |
351 | case S3C24XX_DIV_BCLK: | |
352 | reg = readl(s3c24xx_i2s.regs + S3C2410_IISMOD) & ~(S3C2410_IISMOD_384FS); | |
353 | writel(reg | div, s3c24xx_i2s.regs + S3C2410_IISMOD); | |
354 | break; | |
355 | case S3C24XX_DIV_PRESCALER: | |
356 | writel(div, s3c24xx_i2s.regs + S3C2410_IISPSR); | |
357 | reg = readl(s3c24xx_i2s.regs + S3C2410_IISCON); | |
358 | writel(reg | S3C2410_IISCON_PSCEN, s3c24xx_i2s.regs + S3C2410_IISCON); | |
359 | break; | |
360 | default: | |
361 | return -EINVAL; | |
362 | } | |
363 | ||
364 | return 0; | |
365 | } | |
366 | ||
367 | /* | |
368 | * To avoid duplicating clock code, allow machine driver to | |
369 | * get the clockrate from here. | |
370 | */ | |
371 | u32 s3c24xx_i2s_get_clockrate(void) | |
372 | { | |
373 | return clk_get_rate(s3c24xx_i2s.iis_clk); | |
374 | } | |
375 | EXPORT_SYMBOL_GPL(s3c24xx_i2s_get_clockrate); | |
376 | ||
377 | static int s3c24xx_i2s_probe(struct platform_device *pdev) | |
378 | { | |
379 | DBG("Entered %s\n", __FUNCTION__); | |
380 | ||
381 | s3c24xx_i2s.regs = ioremap(S3C2410_PA_IIS, 0x100); | |
382 | if (s3c24xx_i2s.regs == NULL) | |
383 | return -ENXIO; | |
384 | ||
385 | s3c24xx_i2s.iis_clk=clk_get(&pdev->dev, "iis"); | |
386 | if (s3c24xx_i2s.iis_clk == NULL) { | |
387 | DBG("failed to get iis_clock\n"); | |
388 | return -ENODEV; | |
389 | } | |
390 | clk_enable(s3c24xx_i2s.iis_clk); | |
391 | ||
392 | /* Configure the I2S pins in correct mode */ | |
393 | s3c2410_gpio_cfgpin(S3C2410_GPE0, S3C2410_GPE0_I2SLRCK); | |
394 | s3c2410_gpio_cfgpin(S3C2410_GPE1, S3C2410_GPE1_I2SSCLK); | |
395 | s3c2410_gpio_cfgpin(S3C2410_GPE2, S3C2410_GPE2_CDCLK); | |
396 | s3c2410_gpio_cfgpin(S3C2410_GPE3, S3C2410_GPE3_I2SSDI); | |
397 | s3c2410_gpio_cfgpin(S3C2410_GPE4, S3C2410_GPE4_I2SSDO); | |
398 | ||
399 | writel(S3C2410_IISCON_IISEN, s3c24xx_i2s.regs + S3C2410_IISCON); | |
400 | ||
401 | s3c24xx_snd_txctrl(0); | |
402 | s3c24xx_snd_rxctrl(0); | |
403 | ||
404 | return 0; | |
405 | } | |
406 | ||
407 | #define S3C24XX_I2S_RATES \ | |
408 | (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \ | |
409 | SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \ | |
410 | SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000) | |
411 | ||
412 | struct snd_soc_cpu_dai s3c24xx_i2s_dai = { | |
413 | .name = "s3c24xx-i2s", | |
414 | .id = 0, | |
415 | .type = SND_SOC_DAI_I2S, | |
416 | .probe = s3c24xx_i2s_probe, | |
417 | .playback = { | |
418 | .channels_min = 2, | |
419 | .channels_max = 2, | |
420 | .rates = S3C24XX_I2S_RATES, | |
421 | .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,}, | |
422 | .capture = { | |
423 | .channels_min = 2, | |
424 | .channels_max = 2, | |
425 | .rates = S3C24XX_I2S_RATES, | |
426 | .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,}, | |
427 | .ops = { | |
428 | .trigger = s3c24xx_i2s_trigger, | |
429 | .hw_params = s3c24xx_i2s_hw_params,}, | |
430 | .dai_ops = { | |
431 | .set_fmt = s3c24xx_i2s_set_fmt, | |
432 | .set_clkdiv = s3c24xx_i2s_set_clkdiv, | |
433 | .set_sysclk = s3c24xx_i2s_set_sysclk, | |
434 | }, | |
435 | }; | |
436 | EXPORT_SYMBOL_GPL(s3c24xx_i2s_dai); | |
437 | ||
438 | /* Module information */ | |
439 | MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>"); | |
440 | MODULE_DESCRIPTION("s3c24xx I2S SoC Interface"); | |
441 | MODULE_LICENSE("GPL"); |