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 * Copyright 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 #include <linux/delay.h>
18 #include <linux/clk.h>
19 #include <linux/io.h>
20 #include <linux/gpio.h>
21 #include <linux/module.h>
22
23 #include <sound/soc.h>
24 #include <sound/pcm_params.h>
25
26 #include <mach/dma.h>
27 #include <mach/gpio-samsung.h>
28 #include <plat/gpio-cfg.h>
29 #include "regs-iis.h"
30
31 #include "dma.h"
32 #include "s3c24xx-i2s.h"
33
34 static struct s3c_dma_params s3c24xx_i2s_pcm_stereo_out = {
35 .slave = (void *)(uintptr_t)DMACH_I2S_OUT,
36 .ch_name = "tx",
37 .dma_size = 2,
38 };
39
40 static struct s3c_dma_params s3c24xx_i2s_pcm_stereo_in = {
41 .slave = (void *)(uintptr_t)DMACH_I2S_IN,
42 .ch_name = "rx",
43 .dma_size = 2,
44 };
45
46 struct s3c24xx_i2s_info {
47 void __iomem *regs;
48 struct clk *iis_clk;
49 u32 iiscon;
50 u32 iismod;
51 u32 iisfcon;
52 u32 iispsr;
53 };
54 static struct s3c24xx_i2s_info s3c24xx_i2s;
55
s3c24xx_snd_txctrl(int on)56 static void s3c24xx_snd_txctrl(int on)
57 {
58 u32 iisfcon;
59 u32 iiscon;
60 u32 iismod;
61
62 pr_debug("Entered %s\n", __func__);
63
64 iisfcon = readl(s3c24xx_i2s.regs + S3C2410_IISFCON);
65 iiscon = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
66 iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
67
68 pr_debug("r: IISCON: %x IISMOD: %x IISFCON: %x\n", iiscon, iismod, iisfcon);
69
70 if (on) {
71 iisfcon |= S3C2410_IISFCON_TXDMA | S3C2410_IISFCON_TXENABLE;
72 iiscon |= S3C2410_IISCON_TXDMAEN | S3C2410_IISCON_IISEN;
73 iiscon &= ~S3C2410_IISCON_TXIDLE;
74 iismod |= S3C2410_IISMOD_TXMODE;
75
76 writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
77 writel(iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
78 writel(iiscon, s3c24xx_i2s.regs + S3C2410_IISCON);
79 } else {
80 /* note, we have to disable the FIFOs otherwise bad things
81 * seem to happen when the DMA stops. According to the
82 * Samsung supplied kernel, this should allow the DMA
83 * engine and FIFOs to reset. If this isn't allowed, the
84 * DMA engine will simply freeze randomly.
85 */
86
87 iisfcon &= ~S3C2410_IISFCON_TXENABLE;
88 iisfcon &= ~S3C2410_IISFCON_TXDMA;
89 iiscon |= S3C2410_IISCON_TXIDLE;
90 iiscon &= ~S3C2410_IISCON_TXDMAEN;
91 iismod &= ~S3C2410_IISMOD_TXMODE;
92
93 writel(iiscon, s3c24xx_i2s.regs + S3C2410_IISCON);
94 writel(iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
95 writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
96 }
97
98 pr_debug("w: IISCON: %x IISMOD: %x IISFCON: %x\n", iiscon, iismod, iisfcon);
99 }
100
s3c24xx_snd_rxctrl(int on)101 static void s3c24xx_snd_rxctrl(int on)
102 {
103 u32 iisfcon;
104 u32 iiscon;
105 u32 iismod;
106
107 pr_debug("Entered %s\n", __func__);
108
109 iisfcon = readl(s3c24xx_i2s.regs + S3C2410_IISFCON);
110 iiscon = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
111 iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
112
113 pr_debug("r: IISCON: %x IISMOD: %x IISFCON: %x\n", iiscon, iismod, iisfcon);
114
115 if (on) {
116 iisfcon |= S3C2410_IISFCON_RXDMA | S3C2410_IISFCON_RXENABLE;
117 iiscon |= S3C2410_IISCON_RXDMAEN | S3C2410_IISCON_IISEN;
118 iiscon &= ~S3C2410_IISCON_RXIDLE;
119 iismod |= S3C2410_IISMOD_RXMODE;
120
121 writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
122 writel(iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
123 writel(iiscon, s3c24xx_i2s.regs + S3C2410_IISCON);
124 } else {
125 /* note, we have to disable the FIFOs otherwise bad things
126 * seem to happen when the DMA stops. According to the
127 * Samsung supplied kernel, this should allow the DMA
128 * engine and FIFOs to reset. If this isn't allowed, the
129 * DMA engine will simply freeze randomly.
130 */
131
132 iisfcon &= ~S3C2410_IISFCON_RXENABLE;
133 iisfcon &= ~S3C2410_IISFCON_RXDMA;
134 iiscon |= S3C2410_IISCON_RXIDLE;
135 iiscon &= ~S3C2410_IISCON_RXDMAEN;
136 iismod &= ~S3C2410_IISMOD_RXMODE;
137
138 writel(iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
139 writel(iiscon, s3c24xx_i2s.regs + S3C2410_IISCON);
140 writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
141 }
142
143 pr_debug("w: IISCON: %x IISMOD: %x IISFCON: %x\n", iiscon, iismod, iisfcon);
144 }
145
146 /*
147 * Wait for the LR signal to allow synchronisation to the L/R clock
148 * from the codec. May only be needed for slave mode.
149 */
s3c24xx_snd_lrsync(void)150 static int s3c24xx_snd_lrsync(void)
151 {
152 u32 iiscon;
153 int timeout = 50; /* 5ms */
154
155 pr_debug("Entered %s\n", __func__);
156
157 while (1) {
158 iiscon = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
159 if (iiscon & S3C2410_IISCON_LRINDEX)
160 break;
161
162 if (!timeout--)
163 return -ETIMEDOUT;
164 udelay(100);
165 }
166
167 return 0;
168 }
169
170 /*
171 * Check whether CPU is the master or slave
172 */
s3c24xx_snd_is_clkmaster(void)173 static inline int s3c24xx_snd_is_clkmaster(void)
174 {
175 pr_debug("Entered %s\n", __func__);
176
177 return (readl(s3c24xx_i2s.regs + S3C2410_IISMOD) & S3C2410_IISMOD_SLAVE) ? 0:1;
178 }
179
180 /*
181 * Set S3C24xx I2S DAI format
182 */
s3c24xx_i2s_set_fmt(struct snd_soc_dai * cpu_dai,unsigned int fmt)183 static int s3c24xx_i2s_set_fmt(struct snd_soc_dai *cpu_dai,
184 unsigned int fmt)
185 {
186 u32 iismod;
187
188 pr_debug("Entered %s\n", __func__);
189
190 iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
191 pr_debug("hw_params r: IISMOD: %x \n", iismod);
192
193 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
194 case SND_SOC_DAIFMT_CBM_CFM:
195 iismod |= S3C2410_IISMOD_SLAVE;
196 break;
197 case SND_SOC_DAIFMT_CBS_CFS:
198 iismod &= ~S3C2410_IISMOD_SLAVE;
199 break;
200 default:
201 return -EINVAL;
202 }
203
204 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
205 case SND_SOC_DAIFMT_LEFT_J:
206 iismod |= S3C2410_IISMOD_MSB;
207 break;
208 case SND_SOC_DAIFMT_I2S:
209 iismod &= ~S3C2410_IISMOD_MSB;
210 break;
211 default:
212 return -EINVAL;
213 }
214
215 writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
216 pr_debug("hw_params w: IISMOD: %x \n", iismod);
217 return 0;
218 }
219
s3c24xx_i2s_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params,struct snd_soc_dai * dai)220 static int s3c24xx_i2s_hw_params(struct snd_pcm_substream *substream,
221 struct snd_pcm_hw_params *params,
222 struct snd_soc_dai *dai)
223 {
224 struct snd_dmaengine_dai_dma_data *dma_data;
225 u32 iismod;
226
227 pr_debug("Entered %s\n", __func__);
228
229 dma_data = snd_soc_dai_get_dma_data(dai, substream);
230
231 /* Working copies of register */
232 iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
233 pr_debug("hw_params r: IISMOD: %x\n", iismod);
234
235 switch (params_width(params)) {
236 case 8:
237 iismod &= ~S3C2410_IISMOD_16BIT;
238 dma_data->addr_width = 1;
239 break;
240 case 16:
241 iismod |= S3C2410_IISMOD_16BIT;
242 dma_data->addr_width = 2;
243 break;
244 default:
245 return -EINVAL;
246 }
247
248 writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
249 pr_debug("hw_params w: IISMOD: %x\n", iismod);
250 return 0;
251 }
252
s3c24xx_i2s_trigger(struct snd_pcm_substream * substream,int cmd,struct snd_soc_dai * dai)253 static int s3c24xx_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
254 struct snd_soc_dai *dai)
255 {
256 int ret = 0;
257
258 pr_debug("Entered %s\n", __func__);
259
260 switch (cmd) {
261 case SNDRV_PCM_TRIGGER_START:
262 case SNDRV_PCM_TRIGGER_RESUME:
263 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
264 if (!s3c24xx_snd_is_clkmaster()) {
265 ret = s3c24xx_snd_lrsync();
266 if (ret)
267 goto exit_err;
268 }
269
270 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
271 s3c24xx_snd_rxctrl(1);
272 else
273 s3c24xx_snd_txctrl(1);
274
275 break;
276 case SNDRV_PCM_TRIGGER_STOP:
277 case SNDRV_PCM_TRIGGER_SUSPEND:
278 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
279 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
280 s3c24xx_snd_rxctrl(0);
281 else
282 s3c24xx_snd_txctrl(0);
283 break;
284 default:
285 ret = -EINVAL;
286 break;
287 }
288
289 exit_err:
290 return ret;
291 }
292
293 /*
294 * Set S3C24xx Clock source
295 */
s3c24xx_i2s_set_sysclk(struct snd_soc_dai * cpu_dai,int clk_id,unsigned int freq,int dir)296 static int s3c24xx_i2s_set_sysclk(struct snd_soc_dai *cpu_dai,
297 int clk_id, unsigned int freq, int dir)
298 {
299 u32 iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
300
301 pr_debug("Entered %s\n", __func__);
302
303 iismod &= ~S3C2440_IISMOD_MPLL;
304
305 switch (clk_id) {
306 case S3C24XX_CLKSRC_PCLK:
307 break;
308 case S3C24XX_CLKSRC_MPLL:
309 iismod |= S3C2440_IISMOD_MPLL;
310 break;
311 default:
312 return -EINVAL;
313 }
314
315 writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
316 return 0;
317 }
318
319 /*
320 * Set S3C24xx Clock dividers
321 */
s3c24xx_i2s_set_clkdiv(struct snd_soc_dai * cpu_dai,int div_id,int div)322 static int s3c24xx_i2s_set_clkdiv(struct snd_soc_dai *cpu_dai,
323 int div_id, int div)
324 {
325 u32 reg;
326
327 pr_debug("Entered %s\n", __func__);
328
329 switch (div_id) {
330 case S3C24XX_DIV_BCLK:
331 reg = readl(s3c24xx_i2s.regs + S3C2410_IISMOD) & ~S3C2410_IISMOD_FS_MASK;
332 writel(reg | div, s3c24xx_i2s.regs + S3C2410_IISMOD);
333 break;
334 case S3C24XX_DIV_MCLK:
335 reg = readl(s3c24xx_i2s.regs + S3C2410_IISMOD) & ~(S3C2410_IISMOD_384FS);
336 writel(reg | div, s3c24xx_i2s.regs + S3C2410_IISMOD);
337 break;
338 case S3C24XX_DIV_PRESCALER:
339 writel(div, s3c24xx_i2s.regs + S3C2410_IISPSR);
340 reg = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
341 writel(reg | S3C2410_IISCON_PSCEN, s3c24xx_i2s.regs + S3C2410_IISCON);
342 break;
343 default:
344 return -EINVAL;
345 }
346
347 return 0;
348 }
349
350 /*
351 * To avoid duplicating clock code, allow machine driver to
352 * get the clockrate from here.
353 */
s3c24xx_i2s_get_clockrate(void)354 u32 s3c24xx_i2s_get_clockrate(void)
355 {
356 return clk_get_rate(s3c24xx_i2s.iis_clk);
357 }
358 EXPORT_SYMBOL_GPL(s3c24xx_i2s_get_clockrate);
359
s3c24xx_i2s_probe(struct snd_soc_dai * dai)360 static int s3c24xx_i2s_probe(struct snd_soc_dai *dai)
361 {
362 pr_debug("Entered %s\n", __func__);
363
364 samsung_asoc_init_dma_data(dai, &s3c24xx_i2s_pcm_stereo_out,
365 &s3c24xx_i2s_pcm_stereo_in);
366
367 s3c24xx_i2s.iis_clk = devm_clk_get(dai->dev, "iis");
368 if (IS_ERR(s3c24xx_i2s.iis_clk)) {
369 pr_err("failed to get iis_clock\n");
370 return PTR_ERR(s3c24xx_i2s.iis_clk);
371 }
372 clk_prepare_enable(s3c24xx_i2s.iis_clk);
373
374 /* Configure the I2S pins (GPE0...GPE4) in correct mode */
375 s3c_gpio_cfgall_range(S3C2410_GPE(0), 5, S3C_GPIO_SFN(2),
376 S3C_GPIO_PULL_NONE);
377
378 writel(S3C2410_IISCON_IISEN, s3c24xx_i2s.regs + S3C2410_IISCON);
379
380 s3c24xx_snd_txctrl(0);
381 s3c24xx_snd_rxctrl(0);
382
383 return 0;
384 }
385
386 #ifdef CONFIG_PM
s3c24xx_i2s_suspend(struct snd_soc_dai * cpu_dai)387 static int s3c24xx_i2s_suspend(struct snd_soc_dai *cpu_dai)
388 {
389 pr_debug("Entered %s\n", __func__);
390
391 s3c24xx_i2s.iiscon = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
392 s3c24xx_i2s.iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
393 s3c24xx_i2s.iisfcon = readl(s3c24xx_i2s.regs + S3C2410_IISFCON);
394 s3c24xx_i2s.iispsr = readl(s3c24xx_i2s.regs + S3C2410_IISPSR);
395
396 clk_disable_unprepare(s3c24xx_i2s.iis_clk);
397
398 return 0;
399 }
400
s3c24xx_i2s_resume(struct snd_soc_dai * cpu_dai)401 static int s3c24xx_i2s_resume(struct snd_soc_dai *cpu_dai)
402 {
403 pr_debug("Entered %s\n", __func__);
404 clk_prepare_enable(s3c24xx_i2s.iis_clk);
405
406 writel(s3c24xx_i2s.iiscon, s3c24xx_i2s.regs + S3C2410_IISCON);
407 writel(s3c24xx_i2s.iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
408 writel(s3c24xx_i2s.iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
409 writel(s3c24xx_i2s.iispsr, s3c24xx_i2s.regs + S3C2410_IISPSR);
410
411 return 0;
412 }
413 #else
414 #define s3c24xx_i2s_suspend NULL
415 #define s3c24xx_i2s_resume NULL
416 #endif
417
418
419 #define S3C24XX_I2S_RATES \
420 (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \
421 SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
422 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
423
424 static const struct snd_soc_dai_ops s3c24xx_i2s_dai_ops = {
425 .trigger = s3c24xx_i2s_trigger,
426 .hw_params = s3c24xx_i2s_hw_params,
427 .set_fmt = s3c24xx_i2s_set_fmt,
428 .set_clkdiv = s3c24xx_i2s_set_clkdiv,
429 .set_sysclk = s3c24xx_i2s_set_sysclk,
430 };
431
432 static struct snd_soc_dai_driver s3c24xx_i2s_dai = {
433 .probe = s3c24xx_i2s_probe,
434 .suspend = s3c24xx_i2s_suspend,
435 .resume = s3c24xx_i2s_resume,
436 .playback = {
437 .channels_min = 2,
438 .channels_max = 2,
439 .rates = S3C24XX_I2S_RATES,
440 .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,},
441 .capture = {
442 .channels_min = 2,
443 .channels_max = 2,
444 .rates = S3C24XX_I2S_RATES,
445 .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,},
446 .ops = &s3c24xx_i2s_dai_ops,
447 };
448
449 static const struct snd_soc_component_driver s3c24xx_i2s_component = {
450 .name = "s3c24xx-i2s",
451 };
452
s3c24xx_iis_dev_probe(struct platform_device * pdev)453 static int s3c24xx_iis_dev_probe(struct platform_device *pdev)
454 {
455 int ret = 0;
456 struct resource *res;
457
458 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
459 if (!res) {
460 dev_err(&pdev->dev, "Can't get IO resource.\n");
461 return -ENOENT;
462 }
463 s3c24xx_i2s.regs = devm_ioremap_resource(&pdev->dev, res);
464 if (IS_ERR(s3c24xx_i2s.regs))
465 return PTR_ERR(s3c24xx_i2s.regs);
466
467 s3c24xx_i2s_pcm_stereo_out.dma_addr = res->start + S3C2410_IISFIFO;
468 s3c24xx_i2s_pcm_stereo_in.dma_addr = res->start + S3C2410_IISFIFO;
469
470 ret = devm_snd_soc_register_component(&pdev->dev,
471 &s3c24xx_i2s_component, &s3c24xx_i2s_dai, 1);
472 if (ret) {
473 pr_err("failed to register the dai\n");
474 return ret;
475 }
476
477 ret = samsung_asoc_dma_platform_register(&pdev->dev);
478 if (ret)
479 pr_err("failed to register the dma: %d\n", ret);
480
481 return ret;
482 }
483
484 static struct platform_driver s3c24xx_iis_driver = {
485 .probe = s3c24xx_iis_dev_probe,
486 .driver = {
487 .name = "s3c24xx-iis",
488 .owner = THIS_MODULE,
489 },
490 };
491
492 module_platform_driver(s3c24xx_iis_driver);
493
494 /* Module information */
495 MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
496 MODULE_DESCRIPTION("s3c24xx I2S SoC Interface");
497 MODULE_LICENSE("GPL");
498 MODULE_ALIAS("platform:s3c24xx-iis");
499