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Add linux-next specific files for 20110831
[linux-2.6/next.git] / sound / soc / samsung / s3c-i2s-v2.c
blob52074a2b069600875fc3f2756dc2a25e01fa9163
1 /* sound/soc/samsung/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/delay.h>
20 #include <linux/clk.h>
21 #include <linux/io.h>
22
23 #include <sound/soc.h>
24 #include <sound/pcm_params.h>
25
26 #include <mach/dma.h>
27
28 #include "regs-i2s-v2.h"
29 #include "s3c-i2s-v2.h"
30 #include "dma.h"
31
32 #undef S3C_IIS_V2_SUPPORTED
33
34 #if defined(CONFIG_CPU_S3C2412) || defined(CONFIG_CPU_S3C2413) \
35 || defined(CONFIG_CPU_S5PV210)
36 #define S3C_IIS_V2_SUPPORTED
37 #endif
38
39 #ifdef CONFIG_PLAT_S3C64XX
40 #define S3C_IIS_V2_SUPPORTED
41 #endif
42
43 #ifndef S3C_IIS_V2_SUPPORTED
44 #error Unsupported CPU model
45 #endif
46
47 #define S3C2412_I2S_DEBUG_CON 0
48
49 static inline struct s3c_i2sv2_info *to_info(struct snd_soc_dai *cpu_dai)
50 {
51 return snd_soc_dai_get_drvdata(cpu_dai);
52 }
53
54 #define bit_set(v, b) (((v) & (b)) ? 1 : 0)
55
56 #if S3C2412_I2S_DEBUG_CON
57 static void dbg_showcon(const char *fn, u32 con)
58 {
59 printk(KERN_DEBUG "%s: LRI=%d, TXFEMPT=%d, RXFEMPT=%d, TXFFULL=%d, RXFFULL=%d\n", fn,
60 bit_set(con, S3C2412_IISCON_LRINDEX),
61 bit_set(con, S3C2412_IISCON_TXFIFO_EMPTY),
62 bit_set(con, S3C2412_IISCON_RXFIFO_EMPTY),
63 bit_set(con, S3C2412_IISCON_TXFIFO_FULL),
64 bit_set(con, S3C2412_IISCON_RXFIFO_FULL));
65
66 printk(KERN_DEBUG "%s: PAUSE: TXDMA=%d, RXDMA=%d, TXCH=%d, RXCH=%d\n",
67 fn,
68 bit_set(con, S3C2412_IISCON_TXDMA_PAUSE),
69 bit_set(con, S3C2412_IISCON_RXDMA_PAUSE),
70 bit_set(con, S3C2412_IISCON_TXCH_PAUSE),
71 bit_set(con, S3C2412_IISCON_RXCH_PAUSE));
72 printk(KERN_DEBUG "%s: ACTIVE: TXDMA=%d, RXDMA=%d, IIS=%d\n", fn,
73 bit_set(con, S3C2412_IISCON_TXDMA_ACTIVE),
74 bit_set(con, S3C2412_IISCON_RXDMA_ACTIVE),
75 bit_set(con, S3C2412_IISCON_IIS_ACTIVE));
76 }
77 #else
78 static inline void dbg_showcon(const char *fn, u32 con)
79 {
80 }
81 #endif
82
83
84 /* Turn on or off the transmission path. */
85 static void s3c2412_snd_txctrl(struct s3c_i2sv2_info *i2s, int on)
86 {
87 void __iomem *regs = i2s->regs;
88 u32 fic, con, mod;
89
90 pr_debug("%s(%d)\n", __func__, on);
91
92 fic = readl(regs + S3C2412_IISFIC);
93 con = readl(regs + S3C2412_IISCON);
94 mod = readl(regs + S3C2412_IISMOD);
95
96 pr_debug("%s: IIS: CON=%x MOD=%x FIC=%x\n", __func__, con, mod, fic);
97
98 if (on) {
99 con |= S3C2412_IISCON_TXDMA_ACTIVE | S3C2412_IISCON_IIS_ACTIVE;
100 con &= ~S3C2412_IISCON_TXDMA_PAUSE;
101 con &= ~S3C2412_IISCON_TXCH_PAUSE;
102
103 switch (mod & S3C2412_IISMOD_MODE_MASK) {
104 case S3C2412_IISMOD_MODE_TXONLY:
105 case S3C2412_IISMOD_MODE_TXRX:
106 /* do nothing, we are in the right mode */
107 break;
108
109 case S3C2412_IISMOD_MODE_RXONLY:
110 mod &= ~S3C2412_IISMOD_MODE_MASK;
111 mod |= S3C2412_IISMOD_MODE_TXRX;
112 break;
113
114 default:
115 dev_err(i2s->dev, "TXEN: Invalid MODE %x in IISMOD\n",
116 mod & S3C2412_IISMOD_MODE_MASK);
117 break;
118 }
119
120 writel(con, regs + S3C2412_IISCON);
121 writel(mod, regs + S3C2412_IISMOD);
122 } else {
123 /* Note, we do not have any indication that the FIFO problems
124 * tha the S3C2410/2440 had apply here, so we should be able
125 * to disable the DMA and TX without resetting the FIFOS.
126 */
127
128 con |= S3C2412_IISCON_TXDMA_PAUSE;
129 con |= S3C2412_IISCON_TXCH_PAUSE;
130 con &= ~S3C2412_IISCON_TXDMA_ACTIVE;
131
132 switch (mod & S3C2412_IISMOD_MODE_MASK) {
133 case S3C2412_IISMOD_MODE_TXRX:
134 mod &= ~S3C2412_IISMOD_MODE_MASK;
135 mod |= S3C2412_IISMOD_MODE_RXONLY;
136 break;
137
138 case S3C2412_IISMOD_MODE_TXONLY:
139 mod &= ~S3C2412_IISMOD_MODE_MASK;
140 con &= ~S3C2412_IISCON_IIS_ACTIVE;
141 break;
142
143 default:
144 dev_err(i2s->dev, "TXDIS: Invalid MODE %x in IISMOD\n",
145 mod & S3C2412_IISMOD_MODE_MASK);
146 break;
147 }
148
149 writel(mod, regs + S3C2412_IISMOD);
150 writel(con, regs + S3C2412_IISCON);
151 }
152
153 fic = readl(regs + S3C2412_IISFIC);
154 dbg_showcon(__func__, con);
155 pr_debug("%s: IIS: CON=%x MOD=%x FIC=%x\n", __func__, con, mod, fic);
156 }
157
158 static void s3c2412_snd_rxctrl(struct s3c_i2sv2_info *i2s, int on)
159 {
160 void __iomem *regs = i2s->regs;
161 u32 fic, con, mod;
162
163 pr_debug("%s(%d)\n", __func__, on);
164
165 fic = readl(regs + S3C2412_IISFIC);
166 con = readl(regs + S3C2412_IISCON);
167 mod = readl(regs + S3C2412_IISMOD);
168
169 pr_debug("%s: IIS: CON=%x MOD=%x FIC=%x\n", __func__, con, mod, fic);
170
171 if (on) {
172 con |= S3C2412_IISCON_RXDMA_ACTIVE | S3C2412_IISCON_IIS_ACTIVE;
173 con &= ~S3C2412_IISCON_RXDMA_PAUSE;
174 con &= ~S3C2412_IISCON_RXCH_PAUSE;
175
176 switch (mod & S3C2412_IISMOD_MODE_MASK) {
177 case S3C2412_IISMOD_MODE_TXRX:
178 case S3C2412_IISMOD_MODE_RXONLY:
179 /* do nothing, we are in the right mode */
180 break;
181
182 case S3C2412_IISMOD_MODE_TXONLY:
183 mod &= ~S3C2412_IISMOD_MODE_MASK;
184 mod |= S3C2412_IISMOD_MODE_TXRX;
185 break;
186
187 default:
188 dev_err(i2s->dev, "RXEN: Invalid MODE %x in IISMOD\n",
189 mod & S3C2412_IISMOD_MODE_MASK);
190 }
191
192 writel(mod, regs + S3C2412_IISMOD);
193 writel(con, regs + S3C2412_IISCON);
194 } else {
195 /* See txctrl notes on FIFOs. */
196
197 con &= ~S3C2412_IISCON_RXDMA_ACTIVE;
198 con |= S3C2412_IISCON_RXDMA_PAUSE;
199 con |= S3C2412_IISCON_RXCH_PAUSE;
200
201 switch (mod & S3C2412_IISMOD_MODE_MASK) {
202 case S3C2412_IISMOD_MODE_RXONLY:
203 con &= ~S3C2412_IISCON_IIS_ACTIVE;
204 mod &= ~S3C2412_IISMOD_MODE_MASK;
205 break;
206
207 case S3C2412_IISMOD_MODE_TXRX:
208 mod &= ~S3C2412_IISMOD_MODE_MASK;
209 mod |= S3C2412_IISMOD_MODE_TXONLY;
210 break;
211
212 default:
213 dev_err(i2s->dev, "RXDIS: Invalid MODE %x in IISMOD\n",
214 mod & S3C2412_IISMOD_MODE_MASK);
215 }
216
217 writel(con, regs + S3C2412_IISCON);
218 writel(mod, regs + S3C2412_IISMOD);
219 }
220
221 fic = readl(regs + S3C2412_IISFIC);
222 pr_debug("%s: IIS: CON=%x MOD=%x FIC=%x\n", __func__, con, mod, fic);
223 }
224
225 #define msecs_to_loops(t) (loops_per_jiffy / 1000 * HZ * t)
226
227 /*
228 * Wait for the LR signal to allow synchronisation to the L/R clock
229 * from the codec. May only be needed for slave mode.
230 */
231 static int s3c2412_snd_lrsync(struct s3c_i2sv2_info *i2s)
232 {
233 u32 iiscon;
234 unsigned long loops = msecs_to_loops(5);
235
236 pr_debug("Entered %s\n", __func__);
237
238 while (--loops) {
239 iiscon = readl(i2s->regs + S3C2412_IISCON);
240 if (iiscon & S3C2412_IISCON_LRINDEX)
241 break;
242
243 cpu_relax();
244 }
245
246 if (!loops) {
247 printk(KERN_ERR "%s: timeout\n", __func__);
248 return -ETIMEDOUT;
249 }
250
251 return 0;
252 }
253
254 /*
255 * Set S3C2412 I2S DAI format
256 */
257 static int s3c2412_i2s_set_fmt(struct snd_soc_dai *cpu_dai,
258 unsigned int fmt)
259 {
260 struct s3c_i2sv2_info *i2s = to_info(cpu_dai);
261 u32 iismod;
262
263 pr_debug("Entered %s\n", __func__);
264
265 iismod = readl(i2s->regs + S3C2412_IISMOD);
266 pr_debug("hw_params r: IISMOD: %x \n", iismod);
267
268 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
269 case SND_SOC_DAIFMT_CBM_CFM:
270 i2s->master = 0;
271 iismod |= S3C2412_IISMOD_SLAVE;
272 break;
273 case SND_SOC_DAIFMT_CBS_CFS:
274 i2s->master = 1;
275 iismod &= ~S3C2412_IISMOD_SLAVE;
276 break;
277 default:
278 pr_err("unknwon master/slave format\n");
279 return -EINVAL;
280 }
281
282 iismod &= ~S3C2412_IISMOD_SDF_MASK;
283
284 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
285 case SND_SOC_DAIFMT_RIGHT_J:
286 iismod |= S3C2412_IISMOD_LR_RLOW;
287 iismod |= S3C2412_IISMOD_SDF_MSB;
288 break;
289 case SND_SOC_DAIFMT_LEFT_J:
290 iismod |= S3C2412_IISMOD_LR_RLOW;
291 iismod |= S3C2412_IISMOD_SDF_LSB;
292 break;
293 case SND_SOC_DAIFMT_I2S:
294 iismod &= ~S3C2412_IISMOD_LR_RLOW;
295 iismod |= S3C2412_IISMOD_SDF_IIS;
296 break;
297 default:
298 pr_err("Unknown data format\n");
299 return -EINVAL;
300 }
301
302 writel(iismod, i2s->regs + S3C2412_IISMOD);
303 pr_debug("hw_params w: IISMOD: %x \n", iismod);
304 return 0;
305 }
306
307 static int s3c_i2sv2_hw_params(struct snd_pcm_substream *substream,
308 struct snd_pcm_hw_params *params,
309 struct snd_soc_dai *dai)
310 {
311 struct s3c_i2sv2_info *i2s = to_info(dai);
312 struct s3c_dma_params *dma_data;
313 u32 iismod;
314
315 pr_debug("Entered %s\n", __func__);
316
317 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
318 dma_data = i2s->dma_playback;
319 else
320 dma_data = i2s->dma_capture;
321
322 snd_soc_dai_set_dma_data(dai, substream, dma_data);
323
324 /* Working copies of register */
325 iismod = readl(i2s->regs + S3C2412_IISMOD);
326 pr_debug("%s: r: IISMOD: %x\n", __func__, iismod);
327
328 iismod &= ~S3C64XX_IISMOD_BLC_MASK;
329 /* Sample size */
330 switch (params_format(params)) {
331 case SNDRV_PCM_FORMAT_S8:
332 iismod |= S3C64XX_IISMOD_BLC_8BIT;
333 break;
334 case SNDRV_PCM_FORMAT_S16_LE:
335 break;
336 case SNDRV_PCM_FORMAT_S24_LE:
337 iismod |= S3C64XX_IISMOD_BLC_24BIT;
338 break;
339 }
340
341 writel(iismod, i2s->regs + S3C2412_IISMOD);
342 pr_debug("%s: w: IISMOD: %x\n", __func__, iismod);
343
344 return 0;
345 }
346
347 static int s3c_i2sv2_set_sysclk(struct snd_soc_dai *cpu_dai,
348 int clk_id, unsigned int freq, int dir)
349 {
350 struct s3c_i2sv2_info *i2s = to_info(cpu_dai);
351 u32 iismod = readl(i2s->regs + S3C2412_IISMOD);
352
353 pr_debug("Entered %s\n", __func__);
354 pr_debug("%s r: IISMOD: %x\n", __func__, iismod);
355
356 switch (clk_id) {
357 case S3C_I2SV2_CLKSRC_PCLK:
358 iismod &= ~S3C2412_IISMOD_IMS_SYSMUX;
359 break;
360
361 case S3C_I2SV2_CLKSRC_AUDIOBUS:
362 iismod |= S3C2412_IISMOD_IMS_SYSMUX;
363 break;
364
365 case S3C_I2SV2_CLKSRC_CDCLK:
366 /* Error if controller doesn't have the CDCLKCON bit */
367 if (!(i2s->feature & S3C_FEATURE_CDCLKCON))
368 return -EINVAL;
369
370 switch (dir) {
371 case SND_SOC_CLOCK_IN:
372 iismod |= S3C64XX_IISMOD_CDCLKCON;
373 break;
374 case SND_SOC_CLOCK_OUT:
375 iismod &= ~S3C64XX_IISMOD_CDCLKCON;
376 break;
377 default:
378 return -EINVAL;
379 }
380 break;
381
382 default:
383 return -EINVAL;
384 }
385
386 writel(iismod, i2s->regs + S3C2412_IISMOD);
387 pr_debug("%s w: IISMOD: %x\n", __func__, iismod);
388
389 return 0;
390 }
391
392 static int s3c2412_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
393 struct snd_soc_dai *dai)
394 {
395 struct snd_soc_pcm_runtime *rtd = substream->private_data;
396 struct s3c_i2sv2_info *i2s = to_info(rtd->cpu_dai);
397 int capture = (substream->stream == SNDRV_PCM_STREAM_CAPTURE);
398 unsigned long irqs;
399 int ret = 0;
400 struct s3c_dma_params *dma_data =
401 snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
402
403 pr_debug("Entered %s\n", __func__);
404
405 switch (cmd) {
406 case SNDRV_PCM_TRIGGER_START:
407 /* On start, ensure that the FIFOs are cleared and reset. */
408
409 writel(capture ? S3C2412_IISFIC_RXFLUSH : S3C2412_IISFIC_TXFLUSH,
410 i2s->regs + S3C2412_IISFIC);
411
412 /* clear again, just in case */
413 writel(0x0, i2s->regs + S3C2412_IISFIC);
414
415 case SNDRV_PCM_TRIGGER_RESUME:
416 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
417 if (!i2s->master) {
418 ret = s3c2412_snd_lrsync(i2s);
419 if (ret)
420 goto exit_err;
421 }
422
423 local_irq_save(irqs);
424
425 if (capture)
426 s3c2412_snd_rxctrl(i2s, 1);
427 else
428 s3c2412_snd_txctrl(i2s, 1);
429
430 local_irq_restore(irqs);
431
432 /*
433 * Load the next buffer to DMA to meet the reqirement
434 * of the auto reload mechanism of S3C24XX.
435 * This call won't bother S3C64XX.
436 */
437 s3c2410_dma_ctrl(dma_data->channel, S3C2410_DMAOP_STARTED);
438
439 break;
440
441 case SNDRV_PCM_TRIGGER_STOP:
442 case SNDRV_PCM_TRIGGER_SUSPEND:
443 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
444 local_irq_save(irqs);
445
446 if (capture)
447 s3c2412_snd_rxctrl(i2s, 0);
448 else
449 s3c2412_snd_txctrl(i2s, 0);
450
451 local_irq_restore(irqs);
452 break;
453 default:
454 ret = -EINVAL;
455 break;
456 }
457
458 exit_err:
459 return ret;
460 }
461
462 /*
463 * Set S3C2412 Clock dividers
464 */
465 static int s3c2412_i2s_set_clkdiv(struct snd_soc_dai *cpu_dai,
466 int div_id, int div)
467 {
468 struct s3c_i2sv2_info *i2s = to_info(cpu_dai);
469 u32 reg;
470
471 pr_debug("%s(%p, %d, %d)\n", __func__, cpu_dai, div_id, div);
472
473 switch (div_id) {
474 case S3C_I2SV2_DIV_BCLK:
475 switch (div) {
476 case 16:
477 div = S3C2412_IISMOD_BCLK_16FS;
478 break;
479
480 case 32:
481 div = S3C2412_IISMOD_BCLK_32FS;
482 break;
483
484 case 24:
485 div = S3C2412_IISMOD_BCLK_24FS;
486 break;
487
488 case 48:
489 div = S3C2412_IISMOD_BCLK_48FS;
490 break;
491
492 default:
493 return -EINVAL;
494 }
495
496 reg = readl(i2s->regs + S3C2412_IISMOD);
497 reg &= ~S3C2412_IISMOD_BCLK_MASK;
498 writel(reg | div, i2s->regs + S3C2412_IISMOD);
499
500 pr_debug("%s: MOD=%08x\n", __func__, readl(i2s->regs + S3C2412_IISMOD));
501 break;
502
503 case S3C_I2SV2_DIV_RCLK:
504 switch (div) {
505 case 256:
506 div = S3C2412_IISMOD_RCLK_256FS;
507 break;
508
509 case 384:
510 div = S3C2412_IISMOD_RCLK_384FS;
511 break;
512
513 case 512:
514 div = S3C2412_IISMOD_RCLK_512FS;
515 break;
516
517 case 768:
518 div = S3C2412_IISMOD_RCLK_768FS;
519 break;
520
521 default:
522 return -EINVAL;
523 }
524
525 reg = readl(i2s->regs + S3C2412_IISMOD);
526 reg &= ~S3C2412_IISMOD_RCLK_MASK;
527 writel(reg | div, i2s->regs + S3C2412_IISMOD);
528 pr_debug("%s: MOD=%08x\n", __func__, readl(i2s->regs + S3C2412_IISMOD));
529 break;
530
531 case S3C_I2SV2_DIV_PRESCALER:
532 if (div >= 0) {
533 writel((div << 8) | S3C2412_IISPSR_PSREN,
534 i2s->regs + S3C2412_IISPSR);
535 } else {
536 writel(0x0, i2s->regs + S3C2412_IISPSR);
537 }
538 pr_debug("%s: PSR=%08x\n", __func__, readl(i2s->regs + S3C2412_IISPSR));
539 break;
540
541 default:
542 return -EINVAL;
543 }
544
545 return 0;
546 }
547
548 static snd_pcm_sframes_t s3c2412_i2s_delay(struct snd_pcm_substream *substream,
549 struct snd_soc_dai *dai)
550 {
551 struct s3c_i2sv2_info *i2s = to_info(dai);
552 u32 reg = readl(i2s->regs + S3C2412_IISFIC);
553 snd_pcm_sframes_t delay;
554
555 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
556 delay = S3C2412_IISFIC_TXCOUNT(reg);
557 else
558 delay = S3C2412_IISFIC_RXCOUNT(reg);
559
560 return delay;
561 }
562
563 struct clk *s3c_i2sv2_get_clock(struct snd_soc_dai *cpu_dai)
564 {
565 struct s3c_i2sv2_info *i2s = to_info(cpu_dai);
566 u32 iismod = readl(i2s->regs + S3C2412_IISMOD);
567
568 if (iismod & S3C2412_IISMOD_IMS_SYSMUX)
569 return i2s->iis_cclk;
570 else
571 return i2s->iis_pclk;
572 }
573 EXPORT_SYMBOL_GPL(s3c_i2sv2_get_clock);
574
575 /* default table of all avaialable root fs divisors */
576 static unsigned int iis_fs_tab[] = { 256, 512, 384, 768 };
577
578 int s3c_i2sv2_iis_calc_rate(struct s3c_i2sv2_rate_calc *info,
579 unsigned int *fstab,
580 unsigned int rate, struct clk *clk)
581 {
582 unsigned long clkrate = clk_get_rate(clk);
583 unsigned int div;
584 unsigned int fsclk;
585 unsigned int actual;
586 unsigned int fs;
587 unsigned int fsdiv;
588 signed int deviation = 0;
589 unsigned int best_fs = 0;
590 unsigned int best_div = 0;
591 unsigned int best_rate = 0;
592 unsigned int best_deviation = INT_MAX;
593
594 pr_debug("Input clock rate %ldHz\n", clkrate);
595
596 if (fstab == NULL)
597 fstab = iis_fs_tab;
598
599 for (fs = 0; fs < ARRAY_SIZE(iis_fs_tab); fs++) {
600 fsdiv = iis_fs_tab[fs];
601
602 fsclk = clkrate / fsdiv;
603 div = fsclk / rate;
604
605 if ((fsclk % rate) > (rate / 2))
606 div++;
607
608 if (div <= 1)
609 continue;
610
611 actual = clkrate / (fsdiv * div);
612 deviation = actual - rate;
613
614 printk(KERN_DEBUG "%ufs: div %u => result %u, deviation %d\n",
615 fsdiv, div, actual, deviation);
616
617 deviation = abs(deviation);
618
619 if (deviation < best_deviation) {
620 best_fs = fsdiv;
621 best_div = div;
622 best_rate = actual;
623 best_deviation = deviation;
624 }
625
626 if (deviation == 0)
627 break;
628 }
629
630 printk(KERN_DEBUG "best: fs=%u, div=%u, rate=%u\n",
631 best_fs, best_div, best_rate);
632
633 info->fs_div = best_fs;
634 info->clk_div = best_div;
635
636 return 0;
637 }
638 EXPORT_SYMBOL_GPL(s3c_i2sv2_iis_calc_rate);
639
640 int s3c_i2sv2_probe(struct snd_soc_dai *dai,
641 struct s3c_i2sv2_info *i2s,
642 unsigned long base)
643 {
644 struct device *dev = dai->dev;
645 unsigned int iismod;
646
647 i2s->dev = dev;
648
649 /* record our i2s structure for later use in the callbacks */
650 snd_soc_dai_set_drvdata(dai, i2s);
651
652 i2s->regs = ioremap(base, 0x100);
653 if (i2s->regs == NULL) {
654 dev_err(dev, "cannot ioremap registers\n");
655 return -ENXIO;
656 }
657
658 i2s->iis_pclk = clk_get(dev, "iis");
659 if (IS_ERR(i2s->iis_pclk)) {
660 dev_err(dev, "failed to get iis_clock\n");
661 iounmap(i2s->regs);
662 return -ENOENT;
663 }
664
665 clk_enable(i2s->iis_pclk);
666
667 /* Mark ourselves as in TXRX mode so we can run through our cleanup
668 * process without warnings. */
669 iismod = readl(i2s->regs + S3C2412_IISMOD);
670 iismod |= S3C2412_IISMOD_MODE_TXRX;
671 writel(iismod, i2s->regs + S3C2412_IISMOD);
672 s3c2412_snd_txctrl(i2s, 0);
673 s3c2412_snd_rxctrl(i2s, 0);
674
675 return 0;
676 }
677 EXPORT_SYMBOL_GPL(s3c_i2sv2_probe);
678
679 #ifdef CONFIG_PM
680 static int s3c2412_i2s_suspend(struct snd_soc_dai *dai)
681 {
682 struct s3c_i2sv2_info *i2s = to_info(dai);
683 u32 iismod;
684
685 if (dai->active) {
686 i2s->suspend_iismod = readl(i2s->regs + S3C2412_IISMOD);
687 i2s->suspend_iiscon = readl(i2s->regs + S3C2412_IISCON);
688 i2s->suspend_iispsr = readl(i2s->regs + S3C2412_IISPSR);
689
690 /* some basic suspend checks */
691
692 iismod = readl(i2s->regs + S3C2412_IISMOD);
693
694 if (iismod & S3C2412_IISCON_RXDMA_ACTIVE)
695 pr_warning("%s: RXDMA active?\n", __func__);
696
697 if (iismod & S3C2412_IISCON_TXDMA_ACTIVE)
698 pr_warning("%s: TXDMA active?\n", __func__);
699
700 if (iismod & S3C2412_IISCON_IIS_ACTIVE)
701 pr_warning("%s: IIS active\n", __func__);
702 }
703
704 return 0;
705 }
706
707 static int s3c2412_i2s_resume(struct snd_soc_dai *dai)
708 {
709 struct s3c_i2sv2_info *i2s = to_info(dai);
710
711 pr_info("dai_active %d, IISMOD %08x, IISCON %08x\n",
712 dai->active, i2s->suspend_iismod, i2s->suspend_iiscon);
713
714 if (dai->active) {
715 writel(i2s->suspend_iiscon, i2s->regs + S3C2412_IISCON);
716 writel(i2s->suspend_iismod, i2s->regs + S3C2412_IISMOD);
717 writel(i2s->suspend_iispsr, i2s->regs + S3C2412_IISPSR);
718
719 writel(S3C2412_IISFIC_RXFLUSH | S3C2412_IISFIC_TXFLUSH,
720 i2s->regs + S3C2412_IISFIC);
721
722 ndelay(250);
723 writel(0x0, i2s->regs + S3C2412_IISFIC);
724 }
725
726 return 0;
727 }
728 #else
729 #define s3c2412_i2s_suspend NULL
730 #define s3c2412_i2s_resume NULL
731 #endif
732
733 int s3c_i2sv2_register_dai(struct device *dev, int id,
734 struct snd_soc_dai_driver *drv)
735 {
736 struct snd_soc_dai_ops *ops = drv->ops;
737
738 ops->trigger = s3c2412_i2s_trigger;
739 if (!ops->hw_params)
740 ops->hw_params = s3c_i2sv2_hw_params;
741 ops->set_fmt = s3c2412_i2s_set_fmt;
742 ops->set_clkdiv = s3c2412_i2s_set_clkdiv;
743 ops->set_sysclk = s3c_i2sv2_set_sysclk;
744
745 /* Allow overriding by (for example) IISv4 */
746 if (!ops->delay)
747 ops->delay = s3c2412_i2s_delay;
748
749 drv->suspend = s3c2412_i2s_suspend;
750 drv->resume = s3c2412_i2s_resume;
751
752 return snd_soc_register_dai(dev, drv);
753 }
754 EXPORT_SYMBOL_GPL(s3c_i2sv2_register_dai);
755
756 MODULE_LICENSE("GPL");
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