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First Support on Ginger and OMAP TI
[linux-ginger.git] / sound / soc / s3c24xx / s3c-i2s-v2.c
blob9bc4aa35caab477f918f6f574fadb8ffbf75f319
1 /* sound/soc/s3c24xx/s3c-i2c-v2.c
2 *
3 * ALSA Soc Audio Layer - I2S core for newer Samsung SoCs.
4 *
5 * Copyright (c) 2006 Wolfson Microelectronics PLC.
6 * Graeme Gregory graeme.gregory@wolfsonmicro.com
7 * linux@wolfsonmicro.com
8 *
9 * Copyright (c) 2008, 2007, 2004-2005 Simtec Electronics
10 * http://armlinux.simtec.co.uk/
11 * Ben Dooks <ben@simtec.co.uk>
12 *
13 * This program is free software; you can redistribute it and/or modify it
14 * under the terms of the GNU General Public License as published by the
15 * Free Software Foundation; either version 2 of the License, or (at your
16 * option) any later version.
17 */
18
19 #include <linux/init.h>
20 #include <linux/module.h>
21 #include <linux/device.h>
22 #include <linux/delay.h>
23 #include <linux/clk.h>
24 #include <linux/kernel.h>
25 #include <linux/io.h>
26
27 #include <sound/core.h>
28 #include <sound/pcm.h>
29 #include <sound/pcm_params.h>
30 #include <sound/initval.h>
31 #include <sound/soc.h>
32
33 #include <plat/regs-s3c2412-iis.h>
34
35 #include <plat/audio.h>
36 #include <mach/dma.h>
37
38 #include "s3c-i2s-v2.h"
39 #include "s3c24xx-pcm.h"
40
41 #undef S3C_IIS_V2_SUPPORTED
42
43 #if defined(CONFIG_CPU_S3C2412) || defined(CONFIG_CPU_S3C2413)
44 #define S3C_IIS_V2_SUPPORTED
45 #endif
46
47 #ifdef CONFIG_PLAT_S3C64XX
48 #define S3C_IIS_V2_SUPPORTED
49 #endif
50
51 #ifndef S3C_IIS_V2_SUPPORTED
52 #error Unsupported CPU model
53 #endif
54
55 #define S3C2412_I2S_DEBUG_CON 0
56
57 static inline struct s3c_i2sv2_info *to_info(struct snd_soc_dai *cpu_dai)
58 {
59 return cpu_dai->private_data;
60 }
61
62 #define bit_set(v, b) (((v) & (b)) ? 1 : 0)
63
64 #if S3C2412_I2S_DEBUG_CON
65 static void dbg_showcon(const char *fn, u32 con)
66 {
67 printk(KERN_DEBUG "%s: LRI=%d, TXFEMPT=%d, RXFEMPT=%d, TXFFULL=%d, RXFFULL=%d\n", fn,
68 bit_set(con, S3C2412_IISCON_LRINDEX),
69 bit_set(con, S3C2412_IISCON_TXFIFO_EMPTY),
70 bit_set(con, S3C2412_IISCON_RXFIFO_EMPTY),
71 bit_set(con, S3C2412_IISCON_TXFIFO_FULL),
72 bit_set(con, S3C2412_IISCON_RXFIFO_FULL));
73
74 printk(KERN_DEBUG "%s: PAUSE: TXDMA=%d, RXDMA=%d, TXCH=%d, RXCH=%d\n",
75 fn,
76 bit_set(con, S3C2412_IISCON_TXDMA_PAUSE),
77 bit_set(con, S3C2412_IISCON_RXDMA_PAUSE),
78 bit_set(con, S3C2412_IISCON_TXCH_PAUSE),
79 bit_set(con, S3C2412_IISCON_RXCH_PAUSE));
80 printk(KERN_DEBUG "%s: ACTIVE: TXDMA=%d, RXDMA=%d, IIS=%d\n", fn,
81 bit_set(con, S3C2412_IISCON_TXDMA_ACTIVE),
82 bit_set(con, S3C2412_IISCON_RXDMA_ACTIVE),
83 bit_set(con, S3C2412_IISCON_IIS_ACTIVE));
84 }
85 #else
86 static inline void dbg_showcon(const char *fn, u32 con)
87 {
88 }
89 #endif
90
91
92 /* Turn on or off the transmission path. */
93 static void s3c2412_snd_txctrl(struct s3c_i2sv2_info *i2s, int on)
94 {
95 void __iomem *regs = i2s->regs;
96 u32 fic, con, mod;
97
98 pr_debug("%s(%d)\n", __func__, on);
99
100 fic = readl(regs + S3C2412_IISFIC);
101 con = readl(regs + S3C2412_IISCON);
102 mod = readl(regs + S3C2412_IISMOD);
103
104 pr_debug("%s: IIS: CON=%x MOD=%x FIC=%x\n", __func__, con, mod, fic);
105
106 if (on) {
107 con |= S3C2412_IISCON_TXDMA_ACTIVE | S3C2412_IISCON_IIS_ACTIVE;
108 con &= ~S3C2412_IISCON_TXDMA_PAUSE;
109 con &= ~S3C2412_IISCON_TXCH_PAUSE;
110
111 switch (mod & S3C2412_IISMOD_MODE_MASK) {
112 case S3C2412_IISMOD_MODE_TXONLY:
113 case S3C2412_IISMOD_MODE_TXRX:
114 /* do nothing, we are in the right mode */
115 break;
116
117 case S3C2412_IISMOD_MODE_RXONLY:
118 mod &= ~S3C2412_IISMOD_MODE_MASK;
119 mod |= S3C2412_IISMOD_MODE_TXRX;
120 break;
121
122 default:
123 dev_err(i2s->dev, "TXEN: Invalid MODE %x in IISMOD\n",
124 mod & S3C2412_IISMOD_MODE_MASK);
125 break;
126 }
127
128 writel(con, regs + S3C2412_IISCON);
129 writel(mod, regs + S3C2412_IISMOD);
130 } else {
131 /* Note, we do not have any indication that the FIFO problems
132 * tha the S3C2410/2440 had apply here, so we should be able
133 * to disable the DMA and TX without resetting the FIFOS.
134 */
135
136 con |= S3C2412_IISCON_TXDMA_PAUSE;
137 con |= S3C2412_IISCON_TXCH_PAUSE;
138 con &= ~S3C2412_IISCON_TXDMA_ACTIVE;
139
140 switch (mod & S3C2412_IISMOD_MODE_MASK) {
141 case S3C2412_IISMOD_MODE_TXRX:
142 mod &= ~S3C2412_IISMOD_MODE_MASK;
143 mod |= S3C2412_IISMOD_MODE_RXONLY;
144 break;
145
146 case S3C2412_IISMOD_MODE_TXONLY:
147 mod &= ~S3C2412_IISMOD_MODE_MASK;
148 con &= ~S3C2412_IISCON_IIS_ACTIVE;
149 break;
150
151 default:
152 dev_err(i2s->dev, "TXDIS: Invalid MODE %x in IISMOD\n",
153 mod & S3C2412_IISMOD_MODE_MASK);
154 break;
155 }
156
157 writel(mod, regs + S3C2412_IISMOD);
158 writel(con, regs + S3C2412_IISCON);
159 }
160
161 fic = readl(regs + S3C2412_IISFIC);
162 dbg_showcon(__func__, con);
163 pr_debug("%s: IIS: CON=%x MOD=%x FIC=%x\n", __func__, con, mod, fic);
164 }
165
166 static void s3c2412_snd_rxctrl(struct s3c_i2sv2_info *i2s, int on)
167 {
168 void __iomem *regs = i2s->regs;
169 u32 fic, con, mod;
170
171 pr_debug("%s(%d)\n", __func__, on);
172
173 fic = readl(regs + S3C2412_IISFIC);
174 con = readl(regs + S3C2412_IISCON);
175 mod = readl(regs + S3C2412_IISMOD);
176
177 pr_debug("%s: IIS: CON=%x MOD=%x FIC=%x\n", __func__, con, mod, fic);
178
179 if (on) {
180 con |= S3C2412_IISCON_RXDMA_ACTIVE | S3C2412_IISCON_IIS_ACTIVE;
181 con &= ~S3C2412_IISCON_RXDMA_PAUSE;
182 con &= ~S3C2412_IISCON_RXCH_PAUSE;
183
184 switch (mod & S3C2412_IISMOD_MODE_MASK) {
185 case S3C2412_IISMOD_MODE_TXRX:
186 case S3C2412_IISMOD_MODE_RXONLY:
187 /* do nothing, we are in the right mode */
188 break;
189
190 case S3C2412_IISMOD_MODE_TXONLY:
191 mod &= ~S3C2412_IISMOD_MODE_MASK;
192 mod |= S3C2412_IISMOD_MODE_TXRX;
193 break;
194
195 default:
196 dev_err(i2s->dev, "RXEN: Invalid MODE %x in IISMOD\n",
197 mod & S3C2412_IISMOD_MODE_MASK);
198 }
199
200 writel(mod, regs + S3C2412_IISMOD);
201 writel(con, regs + S3C2412_IISCON);
202 } else {
203 /* See txctrl notes on FIFOs. */
204
205 con &= ~S3C2412_IISCON_RXDMA_ACTIVE;
206 con |= S3C2412_IISCON_RXDMA_PAUSE;
207 con |= S3C2412_IISCON_RXCH_PAUSE;
208
209 switch (mod & S3C2412_IISMOD_MODE_MASK) {
210 case S3C2412_IISMOD_MODE_RXONLY:
211 con &= ~S3C2412_IISCON_IIS_ACTIVE;
212 mod &= ~S3C2412_IISMOD_MODE_MASK;
213 break;
214
215 case S3C2412_IISMOD_MODE_TXRX:
216 mod &= ~S3C2412_IISMOD_MODE_MASK;
217 mod |= S3C2412_IISMOD_MODE_TXONLY;
218 break;
219
220 default:
221 dev_err(i2s->dev, "RXDIS: Invalid MODE %x in IISMOD\n",
222 mod & S3C2412_IISMOD_MODE_MASK);
223 }
224
225 writel(con, regs + S3C2412_IISCON);
226 writel(mod, regs + S3C2412_IISMOD);
227 }
228
229 fic = readl(regs + S3C2412_IISFIC);
230 pr_debug("%s: IIS: CON=%x MOD=%x FIC=%x\n", __func__, con, mod, fic);
231 }
232
233 #define msecs_to_loops(t) (loops_per_jiffy / 1000 * HZ * t)
234
235 /*
236 * Wait for the LR signal to allow synchronisation to the L/R clock
237 * from the codec. May only be needed for slave mode.
238 */
239 static int s3c2412_snd_lrsync(struct s3c_i2sv2_info *i2s)
240 {
241 u32 iiscon;
242 unsigned long loops = msecs_to_loops(5);
243
244 pr_debug("Entered %s\n", __func__);
245
246 while (--loops) {
247 iiscon = readl(i2s->regs + S3C2412_IISCON);
248 if (iiscon & S3C2412_IISCON_LRINDEX)
249 break;
250
251 cpu_relax();
252 }
253
254 if (!loops) {
255 printk(KERN_ERR "%s: timeout\n", __func__);
256 return -ETIMEDOUT;
257 }
258
259 return 0;
260 }
261
262 /*
263 * Set S3C2412 I2S DAI format
264 */
265 static int s3c2412_i2s_set_fmt(struct snd_soc_dai *cpu_dai,
266 unsigned int fmt)
267 {
268 struct s3c_i2sv2_info *i2s = to_info(cpu_dai);
269 u32 iismod;
270
271 pr_debug("Entered %s\n", __func__);
272
273 iismod = readl(i2s->regs + S3C2412_IISMOD);
274 pr_debug("hw_params r: IISMOD: %x \n", iismod);
275
276 #if defined(CONFIG_CPU_S3C2412) || defined(CONFIG_CPU_S3C2413)
277 #define IISMOD_MASTER_MASK S3C2412_IISMOD_MASTER_MASK
278 #define IISMOD_SLAVE S3C2412_IISMOD_SLAVE
279 #define IISMOD_MASTER S3C2412_IISMOD_MASTER_INTERNAL
280 #endif
281
282 #if defined(CONFIG_PLAT_S3C64XX)
283 /* From Rev1.1 datasheet, we have two master and two slave modes:
284 * IMS[11:10]:
285 * 00 = master mode, fed from PCLK
286 * 01 = master mode, fed from CLKAUDIO
287 * 10 = slave mode, using PCLK
288 * 11 = slave mode, using I2SCLK
289 */
290 #define IISMOD_MASTER_MASK (1 << 11)
291 #define IISMOD_SLAVE (1 << 11)
292 #define IISMOD_MASTER (0 << 11)
293 #endif
294
295 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
296 case SND_SOC_DAIFMT_CBM_CFM:
297 i2s->master = 0;
298 iismod &= ~IISMOD_MASTER_MASK;
299 iismod |= IISMOD_SLAVE;
300 break;
301 case SND_SOC_DAIFMT_CBS_CFS:
302 i2s->master = 1;
303 iismod &= ~IISMOD_MASTER_MASK;
304 iismod |= IISMOD_MASTER;
305 break;
306 default:
307 pr_err("unknwon master/slave format\n");
308 return -EINVAL;
309 }
310
311 iismod &= ~S3C2412_IISMOD_SDF_MASK;
312
313 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
314 case SND_SOC_DAIFMT_RIGHT_J:
315 iismod |= S3C2412_IISMOD_SDF_MSB;
316 break;
317 case SND_SOC_DAIFMT_LEFT_J:
318 iismod |= S3C2412_IISMOD_SDF_LSB;
319 break;
320 case SND_SOC_DAIFMT_I2S:
321 iismod |= S3C2412_IISMOD_SDF_IIS;
322 break;
323 default:
324 pr_err("Unknown data format\n");
325 return -EINVAL;
326 }
327
328 writel(iismod, i2s->regs + S3C2412_IISMOD);
329 pr_debug("hw_params w: IISMOD: %x \n", iismod);
330 return 0;
331 }
332
333 static int s3c2412_i2s_hw_params(struct snd_pcm_substream *substream,
334 struct snd_pcm_hw_params *params,
335 struct snd_soc_dai *socdai)
336 {
337 struct snd_soc_pcm_runtime *rtd = substream->private_data;
338 struct snd_soc_dai_link *dai = rtd->dai;
339 struct s3c_i2sv2_info *i2s = to_info(dai->cpu_dai);
340 u32 iismod;
341
342 pr_debug("Entered %s\n", __func__);
343
344 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
345 dai->cpu_dai->dma_data = i2s->dma_playback;
346 else
347 dai->cpu_dai->dma_data = i2s->dma_capture;
348
349 /* Working copies of register */
350 iismod = readl(i2s->regs + S3C2412_IISMOD);
351 pr_debug("%s: r: IISMOD: %x\n", __func__, iismod);
352
353 #if defined(CONFIG_CPU_S3C2412) || defined(CONFIG_CPU_S3C2413)
354 switch (params_format(params)) {
355 case SNDRV_PCM_FORMAT_S8:
356 iismod |= S3C2412_IISMOD_8BIT;
357 break;
358 case SNDRV_PCM_FORMAT_S16_LE:
359 iismod &= ~S3C2412_IISMOD_8BIT;
360 break;
361 }
362 #endif
363
364 #ifdef CONFIG_PLAT_S3C64XX
365 iismod &= ~(S3C64XX_IISMOD_BLC_MASK | S3C2412_IISMOD_BCLK_MASK);
366 /* Sample size */
367 switch (params_format(params)) {
368 case SNDRV_PCM_FORMAT_S8:
369 /* 8 bit sample, 16fs BCLK */
370 iismod |= (S3C64XX_IISMOD_BLC_8BIT | S3C2412_IISMOD_BCLK_16FS);
371 break;
372 case SNDRV_PCM_FORMAT_S16_LE:
373 /* 16 bit sample, 32fs BCLK */
374 break;
375 case SNDRV_PCM_FORMAT_S24_LE:
376 /* 24 bit sample, 48fs BCLK */
377 iismod |= (S3C64XX_IISMOD_BLC_24BIT | S3C2412_IISMOD_BCLK_48FS);
378 break;
379 }
380 #endif
381
382 writel(iismod, i2s->regs + S3C2412_IISMOD);
383 pr_debug("%s: w: IISMOD: %x\n", __func__, iismod);
384 return 0;
385 }
386
387 static int s3c2412_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
388 struct snd_soc_dai *dai)
389 {
390 struct snd_soc_pcm_runtime *rtd = substream->private_data;
391 struct s3c_i2sv2_info *i2s = to_info(rtd->dai->cpu_dai);
392 int capture = (substream->stream == SNDRV_PCM_STREAM_CAPTURE);
393 unsigned long irqs;
394 int ret = 0;
395 int channel = ((struct s3c24xx_pcm_dma_params *)
396 rtd->dai->cpu_dai->dma_data)->channel;
397
398 pr_debug("Entered %s\n", __func__);
399
400 switch (cmd) {
401 case SNDRV_PCM_TRIGGER_START:
402 /* On start, ensure that the FIFOs are cleared and reset. */
403
404 writel(capture ? S3C2412_IISFIC_RXFLUSH : S3C2412_IISFIC_TXFLUSH,
405 i2s->regs + S3C2412_IISFIC);
406
407 /* clear again, just in case */
408 writel(0x0, i2s->regs + S3C2412_IISFIC);
409
410 case SNDRV_PCM_TRIGGER_RESUME:
411 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
412 if (!i2s->master) {
413 ret = s3c2412_snd_lrsync(i2s);
414 if (ret)
415 goto exit_err;
416 }
417
418 local_irq_save(irqs);
419
420 if (capture)
421 s3c2412_snd_rxctrl(i2s, 1);
422 else
423 s3c2412_snd_txctrl(i2s, 1);
424
425 local_irq_restore(irqs);
426
427 /*
428 * Load the next buffer to DMA to meet the reqirement
429 * of the auto reload mechanism of S3C24XX.
430 * This call won't bother S3C64XX.
431 */
432 s3c2410_dma_ctrl(channel, S3C2410_DMAOP_STARTED);
433
434 break;
435
436 case SNDRV_PCM_TRIGGER_STOP:
437 case SNDRV_PCM_TRIGGER_SUSPEND:
438 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
439 local_irq_save(irqs);
440
441 if (capture)
442 s3c2412_snd_rxctrl(i2s, 0);
443 else
444 s3c2412_snd_txctrl(i2s, 0);
445
446 local_irq_restore(irqs);
447 break;
448 default:
449 ret = -EINVAL;
450 break;
451 }
452
453 exit_err:
454 return ret;
455 }
456
457 /*
458 * Set S3C2412 Clock dividers
459 */
460 static int s3c2412_i2s_set_clkdiv(struct snd_soc_dai *cpu_dai,
461 int div_id, int div)
462 {
463 struct s3c_i2sv2_info *i2s = to_info(cpu_dai);
464 u32 reg;
465
466 pr_debug("%s(%p, %d, %d)\n", __func__, cpu_dai, div_id, div);
467
468 switch (div_id) {
469 case S3C_I2SV2_DIV_BCLK:
470 reg = readl(i2s->regs + S3C2412_IISMOD);
471 reg &= ~S3C2412_IISMOD_BCLK_MASK;
472 writel(reg | div, i2s->regs + S3C2412_IISMOD);
473
474 pr_debug("%s: MOD=%08x\n", __func__, readl(i2s->regs + S3C2412_IISMOD));
475 break;
476
477 case S3C_I2SV2_DIV_RCLK:
478 if (div > 3) {
479 /* convert value to bit field */
480
481 switch (div) {
482 case 256:
483 div = S3C2412_IISMOD_RCLK_256FS;
484 break;
485
486 case 384:
487 div = S3C2412_IISMOD_RCLK_384FS;
488 break;
489
490 case 512:
491 div = S3C2412_IISMOD_RCLK_512FS;
492 break;
493
494 case 768:
495 div = S3C2412_IISMOD_RCLK_768FS;
496 break;
497
498 default:
499 return -EINVAL;
500 }
501 }
502
503 reg = readl(i2s->regs + S3C2412_IISMOD);
504 reg &= ~S3C2412_IISMOD_RCLK_MASK;
505 writel(reg | div, i2s->regs + S3C2412_IISMOD);
506 pr_debug("%s: MOD=%08x\n", __func__, readl(i2s->regs + S3C2412_IISMOD));
507 break;
508
509 case S3C_I2SV2_DIV_PRESCALER:
510 if (div >= 0) {
511 writel((div << 8) | S3C2412_IISPSR_PSREN,
512 i2s->regs + S3C2412_IISPSR);
513 } else {
514 writel(0x0, i2s->regs + S3C2412_IISPSR);
515 }
516 pr_debug("%s: PSR=%08x\n", __func__, readl(i2s->regs + S3C2412_IISPSR));
517 break;
518
519 default:
520 return -EINVAL;
521 }
522
523 return 0;
524 }
525
526 /* default table of all avaialable root fs divisors */
527 static unsigned int iis_fs_tab[] = { 256, 512, 384, 768 };
528
529 int s3c_i2sv2_iis_calc_rate(struct s3c_i2sv2_rate_calc *info,
530 unsigned int *fstab,
531 unsigned int rate, struct clk *clk)
532 {
533 unsigned long clkrate = clk_get_rate(clk);
534 unsigned int div;
535 unsigned int fsclk;
536 unsigned int actual;
537 unsigned int fs;
538 unsigned int fsdiv;
539 signed int deviation = 0;
540 unsigned int best_fs = 0;
541 unsigned int best_div = 0;
542 unsigned int best_rate = 0;
543 unsigned int best_deviation = INT_MAX;
544
545 pr_debug("Input clock rate %ldHz\n", clkrate);
546
547 if (fstab == NULL)
548 fstab = iis_fs_tab;
549
550 for (fs = 0; fs < ARRAY_SIZE(iis_fs_tab); fs++) {
551 fsdiv = iis_fs_tab[fs];
552
553 fsclk = clkrate / fsdiv;
554 div = fsclk / rate;
555
556 if ((fsclk % rate) > (rate / 2))
557 div++;
558
559 if (div <= 1)
560 continue;
561
562 actual = clkrate / (fsdiv * div);
563 deviation = actual - rate;
564
565 printk(KERN_DEBUG "%ufs: div %u => result %u, deviation %d\n",
566 fsdiv, div, actual, deviation);
567
568 deviation = abs(deviation);
569
570 if (deviation < best_deviation) {
571 best_fs = fsdiv;
572 best_div = div;
573 best_rate = actual;
574 best_deviation = deviation;
575 }
576
577 if (deviation == 0)
578 break;
579 }
580
581 printk(KERN_DEBUG "best: fs=%u, div=%u, rate=%u\n",
582 best_fs, best_div, best_rate);
583
584 info->fs_div = best_fs;
585 info->clk_div = best_div;
586
587 return 0;
588 }
589 EXPORT_SYMBOL_GPL(s3c_i2sv2_iis_calc_rate);
590
591 int s3c_i2sv2_probe(struct platform_device *pdev,
592 struct snd_soc_dai *dai,
593 struct s3c_i2sv2_info *i2s,
594 unsigned long base)
595 {
596 struct device *dev = &pdev->dev;
597 unsigned int iismod;
598
599 i2s->dev = dev;
600
601 /* record our i2s structure for later use in the callbacks */
602 dai->private_data = i2s;
603
604 if (!base) {
605 struct resource *res = platform_get_resource(pdev,
606 IORESOURCE_MEM,
607 0);
608 if (!res) {
609 dev_err(dev, "Unable to get register resource\n");
610 return -ENXIO;
611 }
612
613 if (!request_mem_region(res->start, resource_size(res),
614 "s3c64xx-i2s-v4")) {
615 dev_err(dev, "Unable to request register region\n");
616 return -EBUSY;
617 }
618
619 base = res->start;
620 }
621
622 i2s->regs = ioremap(base, 0x100);
623 if (i2s->regs == NULL) {
624 dev_err(dev, "cannot ioremap registers\n");
625 return -ENXIO;
626 }
627
628 i2s->iis_pclk = clk_get(dev, "iis");
629 if (i2s->iis_pclk == NULL) {
630 dev_err(dev, "failed to get iis_clock\n");
631 iounmap(i2s->regs);
632 return -ENOENT;
633 }
634
635 clk_enable(i2s->iis_pclk);
636
637 /* Mark ourselves as in TXRX mode so we can run through our cleanup
638 * process without warnings. */
639 iismod = readl(i2s->regs + S3C2412_IISMOD);
640 iismod |= S3C2412_IISMOD_MODE_TXRX;
641 writel(iismod, i2s->regs + S3C2412_IISMOD);
642 s3c2412_snd_txctrl(i2s, 0);
643 s3c2412_snd_rxctrl(i2s, 0);
644
645 return 0;
646 }
647 EXPORT_SYMBOL_GPL(s3c_i2sv2_probe);
648
649 #ifdef CONFIG_PM
650 static int s3c2412_i2s_suspend(struct snd_soc_dai *dai)
651 {
652 struct s3c_i2sv2_info *i2s = to_info(dai);
653 u32 iismod;
654
655 if (dai->active) {
656 i2s->suspend_iismod = readl(i2s->regs + S3C2412_IISMOD);
657 i2s->suspend_iiscon = readl(i2s->regs + S3C2412_IISCON);
658 i2s->suspend_iispsr = readl(i2s->regs + S3C2412_IISPSR);
659
660 /* some basic suspend checks */
661
662 iismod = readl(i2s->regs + S3C2412_IISMOD);
663
664 if (iismod & S3C2412_IISCON_RXDMA_ACTIVE)
665 pr_warning("%s: RXDMA active?\n", __func__);
666
667 if (iismod & S3C2412_IISCON_TXDMA_ACTIVE)
668 pr_warning("%s: TXDMA active?\n", __func__);
669
670 if (iismod & S3C2412_IISCON_IIS_ACTIVE)
671 pr_warning("%s: IIS active\n", __func__);
672 }
673
674 return 0;
675 }
676
677 static int s3c2412_i2s_resume(struct snd_soc_dai *dai)
678 {
679 struct s3c_i2sv2_info *i2s = to_info(dai);
680
681 pr_info("dai_active %d, IISMOD %08x, IISCON %08x\n",
682 dai->active, i2s->suspend_iismod, i2s->suspend_iiscon);
683
684 if (dai->active) {
685 writel(i2s->suspend_iiscon, i2s->regs + S3C2412_IISCON);
686 writel(i2s->suspend_iismod, i2s->regs + S3C2412_IISMOD);
687 writel(i2s->suspend_iispsr, i2s->regs + S3C2412_IISPSR);
688
689 writel(S3C2412_IISFIC_RXFLUSH | S3C2412_IISFIC_TXFLUSH,
690 i2s->regs + S3C2412_IISFIC);
691
692 ndelay(250);
693 writel(0x0, i2s->regs + S3C2412_IISFIC);
694 }
695
696 return 0;
697 }
698 #else
699 #define s3c2412_i2s_suspend NULL
700 #define s3c2412_i2s_resume NULL
701 #endif
702
703 int s3c_i2sv2_register_dai(struct snd_soc_dai *dai)
704 {
705 struct snd_soc_dai_ops *ops = dai->ops;
706
707 ops->trigger = s3c2412_i2s_trigger;
708 ops->hw_params = s3c2412_i2s_hw_params;
709 ops->set_fmt = s3c2412_i2s_set_fmt;
710 ops->set_clkdiv = s3c2412_i2s_set_clkdiv;
711
712 dai->suspend = s3c2412_i2s_suspend;
713 dai->resume = s3c2412_i2s_resume;
714
715 return snd_soc_register_dai(dai);
716 }
717 EXPORT_SYMBOL_GPL(s3c_i2sv2_register_dai);
718
719 MODULE_LICENSE("GPL");
Linux for Ginger Game Console