1 /* ALSA Soc Audio Layer - I2S core for newer Samsung SoCs.
2 *
3 * Copyright (c) 2006 Wolfson Microelectronics PLC.
4 * Graeme Gregory graeme.gregory@wolfsonmicro.com
5 * linux@wolfsonmicro.com
6 *
7 * Copyright (c) 2008, 2007, 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/module.h>
18 #include <linux/delay.h>
19 #include <linux/clk.h>
20 #include <linux/io.h>
21
22 #include <sound/soc.h>
23 #include <sound/pcm_params.h>
24
25 #include "regs-i2s-v2.h"
26 #include "s3c-i2s-v2.h"
27
28 #undef S3C_IIS_V2_SUPPORTED
29
30 #if defined(CONFIG_CPU_S3C2412) \
31 || defined(CONFIG_ARCH_S3C64XX) || defined(CONFIG_CPU_S5PV210)
32 #define S3C_IIS_V2_SUPPORTED
33 #endif
34
35 #ifndef S3C_IIS_V2_SUPPORTED
36 #error Unsupported CPU model
37 #endif
38
39 #define S3C2412_I2S_DEBUG_CON 0
40
to_info(struct snd_soc_dai * cpu_dai)41 static inline struct s3c_i2sv2_info *to_info(struct snd_soc_dai *cpu_dai)
42 {
43 return snd_soc_dai_get_drvdata(cpu_dai);
44 }
45
46 #define bit_set(v, b) (((v) & (b)) ? 1 : 0)
47
48 #if S3C2412_I2S_DEBUG_CON
dbg_showcon(const char * fn,u32 con)49 static void dbg_showcon(const char *fn, u32 con)
50 {
51 printk(KERN_DEBUG "%s: LRI=%d, TXFEMPT=%d, RXFEMPT=%d, TXFFULL=%d, RXFFULL=%d\n", fn,
52 bit_set(con, S3C2412_IISCON_LRINDEX),
53 bit_set(con, S3C2412_IISCON_TXFIFO_EMPTY),
54 bit_set(con, S3C2412_IISCON_RXFIFO_EMPTY),
55 bit_set(con, S3C2412_IISCON_TXFIFO_FULL),
56 bit_set(con, S3C2412_IISCON_RXFIFO_FULL));
57
58 printk(KERN_DEBUG "%s: PAUSE: TXDMA=%d, RXDMA=%d, TXCH=%d, RXCH=%d\n",
59 fn,
60 bit_set(con, S3C2412_IISCON_TXDMA_PAUSE),
61 bit_set(con, S3C2412_IISCON_RXDMA_PAUSE),
62 bit_set(con, S3C2412_IISCON_TXCH_PAUSE),
63 bit_set(con, S3C2412_IISCON_RXCH_PAUSE));
64 printk(KERN_DEBUG "%s: ACTIVE: TXDMA=%d, RXDMA=%d, IIS=%d\n", fn,
65 bit_set(con, S3C2412_IISCON_TXDMA_ACTIVE),
66 bit_set(con, S3C2412_IISCON_RXDMA_ACTIVE),
67 bit_set(con, S3C2412_IISCON_IIS_ACTIVE));
68 }
69 #else
dbg_showcon(const char * fn,u32 con)70 static inline void dbg_showcon(const char *fn, u32 con)
71 {
72 }
73 #endif
74
75 /* Turn on or off the transmission path. */
s3c2412_snd_txctrl(struct s3c_i2sv2_info * i2s,int on)76 static void s3c2412_snd_txctrl(struct s3c_i2sv2_info *i2s, int on)
77 {
78 void __iomem *regs = i2s->regs;
79 u32 fic, con, mod;
80
81 pr_debug("%s(%d)\n", __func__, on);
82
83 fic = readl(regs + S3C2412_IISFIC);
84 con = readl(regs + S3C2412_IISCON);
85 mod = readl(regs + S3C2412_IISMOD);
86
87 pr_debug("%s: IIS: CON=%x MOD=%x FIC=%x\n", __func__, con, mod, fic);
88
89 if (on) {
90 con |= S3C2412_IISCON_TXDMA_ACTIVE | S3C2412_IISCON_IIS_ACTIVE;
91 con &= ~S3C2412_IISCON_TXDMA_PAUSE;
92 con &= ~S3C2412_IISCON_TXCH_PAUSE;
93
94 switch (mod & S3C2412_IISMOD_MODE_MASK) {
95 case S3C2412_IISMOD_MODE_TXONLY:
96 case S3C2412_IISMOD_MODE_TXRX:
97 /* do nothing, we are in the right mode */
98 break;
99
100 case S3C2412_IISMOD_MODE_RXONLY:
101 mod &= ~S3C2412_IISMOD_MODE_MASK;
102 mod |= S3C2412_IISMOD_MODE_TXRX;
103 break;
104
105 default:
106 dev_err(i2s->dev, "TXEN: Invalid MODE %x in IISMOD\n",
107 mod & S3C2412_IISMOD_MODE_MASK);
108 break;
109 }
110
111 writel(con, regs + S3C2412_IISCON);
112 writel(mod, regs + S3C2412_IISMOD);
113 } else {
114 /* Note, we do not have any indication that the FIFO problems
115 * tha the S3C2410/2440 had apply here, so we should be able
116 * to disable the DMA and TX without resetting the FIFOS.
117 */
118
119 con |= S3C2412_IISCON_TXDMA_PAUSE;
120 con |= S3C2412_IISCON_TXCH_PAUSE;
121 con &= ~S3C2412_IISCON_TXDMA_ACTIVE;
122
123 switch (mod & S3C2412_IISMOD_MODE_MASK) {
124 case S3C2412_IISMOD_MODE_TXRX:
125 mod &= ~S3C2412_IISMOD_MODE_MASK;
126 mod |= S3C2412_IISMOD_MODE_RXONLY;
127 break;
128
129 case S3C2412_IISMOD_MODE_TXONLY:
130 mod &= ~S3C2412_IISMOD_MODE_MASK;
131 con &= ~S3C2412_IISCON_IIS_ACTIVE;
132 break;
133
134 default:
135 dev_err(i2s->dev, "TXDIS: Invalid MODE %x in IISMOD\n",
136 mod & S3C2412_IISMOD_MODE_MASK);
137 break;
138 }
139
140 writel(mod, regs + S3C2412_IISMOD);
141 writel(con, regs + S3C2412_IISCON);
142 }
143
144 fic = readl(regs + S3C2412_IISFIC);
145 dbg_showcon(__func__, con);
146 pr_debug("%s: IIS: CON=%x MOD=%x FIC=%x\n", __func__, con, mod, fic);
147 }
148
s3c2412_snd_rxctrl(struct s3c_i2sv2_info * i2s,int on)149 static void s3c2412_snd_rxctrl(struct s3c_i2sv2_info *i2s, int on)
150 {
151 void __iomem *regs = i2s->regs;
152 u32 fic, con, mod;
153
154 pr_debug("%s(%d)\n", __func__, on);
155
156 fic = readl(regs + S3C2412_IISFIC);
157 con = readl(regs + S3C2412_IISCON);
158 mod = readl(regs + S3C2412_IISMOD);
159
160 pr_debug("%s: IIS: CON=%x MOD=%x FIC=%x\n", __func__, con, mod, fic);
161
162 if (on) {
163 con |= S3C2412_IISCON_RXDMA_ACTIVE | S3C2412_IISCON_IIS_ACTIVE;
164 con &= ~S3C2412_IISCON_RXDMA_PAUSE;
165 con &= ~S3C2412_IISCON_RXCH_PAUSE;
166
167 switch (mod & S3C2412_IISMOD_MODE_MASK) {
168 case S3C2412_IISMOD_MODE_TXRX:
169 case S3C2412_IISMOD_MODE_RXONLY:
170 /* do nothing, we are in the right mode */
171 break;
172
173 case S3C2412_IISMOD_MODE_TXONLY:
174 mod &= ~S3C2412_IISMOD_MODE_MASK;
175 mod |= S3C2412_IISMOD_MODE_TXRX;
176 break;
177
178 default:
179 dev_err(i2s->dev, "RXEN: Invalid MODE %x in IISMOD\n",
180 mod & S3C2412_IISMOD_MODE_MASK);
181 }
182
183 writel(mod, regs + S3C2412_IISMOD);
184 writel(con, regs + S3C2412_IISCON);
185 } else {
186 /* See txctrl notes on FIFOs. */
187
188 con &= ~S3C2412_IISCON_RXDMA_ACTIVE;
189 con |= S3C2412_IISCON_RXDMA_PAUSE;
190 con |= S3C2412_IISCON_RXCH_PAUSE;
191
192 switch (mod & S3C2412_IISMOD_MODE_MASK) {
193 case S3C2412_IISMOD_MODE_RXONLY:
194 con &= ~S3C2412_IISCON_IIS_ACTIVE;
195 mod &= ~S3C2412_IISMOD_MODE_MASK;
196 break;
197
198 case S3C2412_IISMOD_MODE_TXRX:
199 mod &= ~S3C2412_IISMOD_MODE_MASK;
200 mod |= S3C2412_IISMOD_MODE_TXONLY;
201 break;
202
203 default:
204 dev_err(i2s->dev, "RXDIS: Invalid MODE %x in IISMOD\n",
205 mod & S3C2412_IISMOD_MODE_MASK);
206 }
207
208 writel(con, regs + S3C2412_IISCON);
209 writel(mod, regs + S3C2412_IISMOD);
210 }
211
212 fic = readl(regs + S3C2412_IISFIC);
213 pr_debug("%s: IIS: CON=%x MOD=%x FIC=%x\n", __func__, con, mod, fic);
214 }
215
216 #define msecs_to_loops(t) (loops_per_jiffy / 1000 * HZ * t)
217
218 /*
219 * Wait for the LR signal to allow synchronisation to the L/R clock
220 * from the codec. May only be needed for slave mode.
221 */
s3c2412_snd_lrsync(struct s3c_i2sv2_info * i2s)222 static int s3c2412_snd_lrsync(struct s3c_i2sv2_info *i2s)
223 {
224 u32 iiscon;
225 unsigned long loops = msecs_to_loops(5);
226
227 pr_debug("Entered %s\n", __func__);
228
229 while (--loops) {
230 iiscon = readl(i2s->regs + S3C2412_IISCON);
231 if (iiscon & S3C2412_IISCON_LRINDEX)
232 break;
233
234 cpu_relax();
235 }
236
237 if (!loops) {
238 printk(KERN_ERR "%s: timeout\n", __func__);
239 return -ETIMEDOUT;
240 }
241
242 return 0;
243 }
244
245 /*
246 * Set S3C2412 I2S DAI format
247 */
s3c2412_i2s_set_fmt(struct snd_soc_dai * cpu_dai,unsigned int fmt)248 static int s3c2412_i2s_set_fmt(struct snd_soc_dai *cpu_dai,
249 unsigned int fmt)
250 {
251 struct s3c_i2sv2_info *i2s = to_info(cpu_dai);
252 u32 iismod;
253
254 pr_debug("Entered %s\n", __func__);
255
256 iismod = readl(i2s->regs + S3C2412_IISMOD);
257 pr_debug("hw_params r: IISMOD: %x \n", iismod);
258
259 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
260 case SND_SOC_DAIFMT_CBM_CFM:
261 i2s->master = 0;
262 iismod |= S3C2412_IISMOD_SLAVE;
263 break;
264 case SND_SOC_DAIFMT_CBS_CFS:
265 i2s->master = 1;
266 iismod &= ~S3C2412_IISMOD_SLAVE;
267 break;
268 default:
269 pr_err("unknown master/slave format\n");
270 return -EINVAL;
271 }
272
273 iismod &= ~S3C2412_IISMOD_SDF_MASK;
274
275 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
276 case SND_SOC_DAIFMT_RIGHT_J:
277 iismod |= S3C2412_IISMOD_LR_RLOW;
278 iismod |= S3C2412_IISMOD_SDF_MSB;
279 break;
280 case SND_SOC_DAIFMT_LEFT_J:
281 iismod |= S3C2412_IISMOD_LR_RLOW;
282 iismod |= S3C2412_IISMOD_SDF_LSB;
283 break;
284 case SND_SOC_DAIFMT_I2S:
285 iismod &= ~S3C2412_IISMOD_LR_RLOW;
286 iismod |= S3C2412_IISMOD_SDF_IIS;
287 break;
288 default:
289 pr_err("Unknown data format\n");
290 return -EINVAL;
291 }
292
293 writel(iismod, i2s->regs + S3C2412_IISMOD);
294 pr_debug("hw_params w: IISMOD: %x \n", iismod);
295 return 0;
296 }
297
s3c_i2sv2_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params,struct snd_soc_dai * dai)298 static int s3c_i2sv2_hw_params(struct snd_pcm_substream *substream,
299 struct snd_pcm_hw_params *params,
300 struct snd_soc_dai *dai)
301 {
302 struct s3c_i2sv2_info *i2s = to_info(dai);
303 struct snd_dmaengine_dai_dma_data *dma_data;
304 u32 iismod;
305
306 pr_debug("Entered %s\n", __func__);
307
308 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
309 dma_data = i2s->dma_playback;
310 else
311 dma_data = i2s->dma_capture;
312
313 snd_soc_dai_set_dma_data(dai, substream, dma_data);
314
315 /* Working copies of register */
316 iismod = readl(i2s->regs + S3C2412_IISMOD);
317 pr_debug("%s: r: IISMOD: %x\n", __func__, iismod);
318
319 iismod &= ~S3C64XX_IISMOD_BLC_MASK;
320 /* Sample size */
321 switch (params_width(params)) {
322 case 8:
323 iismod |= S3C64XX_IISMOD_BLC_8BIT;
324 break;
325 case 16:
326 break;
327 case 24:
328 iismod |= S3C64XX_IISMOD_BLC_24BIT;
329 break;
330 }
331
332 writel(iismod, i2s->regs + S3C2412_IISMOD);
333 pr_debug("%s: w: IISMOD: %x\n", __func__, iismod);
334
335 return 0;
336 }
337
s3c_i2sv2_set_sysclk(struct snd_soc_dai * cpu_dai,int clk_id,unsigned int freq,int dir)338 static int s3c_i2sv2_set_sysclk(struct snd_soc_dai *cpu_dai,
339 int clk_id, unsigned int freq, int dir)
340 {
341 struct s3c_i2sv2_info *i2s = to_info(cpu_dai);
342 u32 iismod = readl(i2s->regs + S3C2412_IISMOD);
343
344 pr_debug("Entered %s\n", __func__);
345 pr_debug("%s r: IISMOD: %x\n", __func__, iismod);
346
347 switch (clk_id) {
348 case S3C_I2SV2_CLKSRC_PCLK:
349 iismod &= ~S3C2412_IISMOD_IMS_SYSMUX;
350 break;
351
352 case S3C_I2SV2_CLKSRC_AUDIOBUS:
353 iismod |= S3C2412_IISMOD_IMS_SYSMUX;
354 break;
355
356 case S3C_I2SV2_CLKSRC_CDCLK:
357 /* Error if controller doesn't have the CDCLKCON bit */
358 if (!(i2s->feature & S3C_FEATURE_CDCLKCON))
359 return -EINVAL;
360
361 switch (dir) {
362 case SND_SOC_CLOCK_IN:
363 iismod |= S3C64XX_IISMOD_CDCLKCON;
364 break;
365 case SND_SOC_CLOCK_OUT:
366 iismod &= ~S3C64XX_IISMOD_CDCLKCON;
367 break;
368 default:
369 return -EINVAL;
370 }
371 break;
372
373 default:
374 return -EINVAL;
375 }
376
377 writel(iismod, i2s->regs + S3C2412_IISMOD);
378 pr_debug("%s w: IISMOD: %x\n", __func__, iismod);
379
380 return 0;
381 }
382
s3c2412_i2s_trigger(struct snd_pcm_substream * substream,int cmd,struct snd_soc_dai * dai)383 static int s3c2412_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
384 struct snd_soc_dai *dai)
385 {
386 struct snd_soc_pcm_runtime *rtd = substream->private_data;
387 struct s3c_i2sv2_info *i2s = to_info(rtd->cpu_dai);
388 int capture = (substream->stream == SNDRV_PCM_STREAM_CAPTURE);
389 unsigned long irqs;
390 int ret = 0;
391
392 pr_debug("Entered %s\n", __func__);
393
394 switch (cmd) {
395 case SNDRV_PCM_TRIGGER_START:
396 /* On start, ensure that the FIFOs are cleared and reset. */
397
398 writel(capture ? S3C2412_IISFIC_RXFLUSH : S3C2412_IISFIC_TXFLUSH,
399 i2s->regs + S3C2412_IISFIC);
400
401 /* clear again, just in case */
402 writel(0x0, i2s->regs + S3C2412_IISFIC);
403
404 case SNDRV_PCM_TRIGGER_RESUME:
405 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
406 if (!i2s->master) {
407 ret = s3c2412_snd_lrsync(i2s);
408 if (ret)
409 goto exit_err;
410 }
411
412 local_irq_save(irqs);
413
414 if (capture)
415 s3c2412_snd_rxctrl(i2s, 1);
416 else
417 s3c2412_snd_txctrl(i2s, 1);
418
419 local_irq_restore(irqs);
420
421 break;
422
423 case SNDRV_PCM_TRIGGER_STOP:
424 case SNDRV_PCM_TRIGGER_SUSPEND:
425 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
426 local_irq_save(irqs);
427
428 if (capture)
429 s3c2412_snd_rxctrl(i2s, 0);
430 else
431 s3c2412_snd_txctrl(i2s, 0);
432
433 local_irq_restore(irqs);
434 break;
435 default:
436 ret = -EINVAL;
437 break;
438 }
439
440 exit_err:
441 return ret;
442 }
443
444 /*
445 * Set S3C2412 Clock dividers
446 */
s3c2412_i2s_set_clkdiv(struct snd_soc_dai * cpu_dai,int div_id,int div)447 static int s3c2412_i2s_set_clkdiv(struct snd_soc_dai *cpu_dai,
448 int div_id, int div)
449 {
450 struct s3c_i2sv2_info *i2s = to_info(cpu_dai);
451 u32 reg;
452
453 pr_debug("%s(%p, %d, %d)\n", __func__, cpu_dai, div_id, div);
454
455 switch (div_id) {
456 case S3C_I2SV2_DIV_BCLK:
457 switch (div) {
458 case 16:
459 div = S3C2412_IISMOD_BCLK_16FS;
460 break;
461
462 case 32:
463 div = S3C2412_IISMOD_BCLK_32FS;
464 break;
465
466 case 24:
467 div = S3C2412_IISMOD_BCLK_24FS;
468 break;
469
470 case 48:
471 div = S3C2412_IISMOD_BCLK_48FS;
472 break;
473
474 default:
475 return -EINVAL;
476 }
477
478 reg = readl(i2s->regs + S3C2412_IISMOD);
479 reg &= ~S3C2412_IISMOD_BCLK_MASK;
480 writel(reg | div, i2s->regs + S3C2412_IISMOD);
481
482 pr_debug("%s: MOD=%08x\n", __func__, readl(i2s->regs + S3C2412_IISMOD));
483 break;
484
485 case S3C_I2SV2_DIV_RCLK:
486 switch (div) {
487 case 256:
488 div = S3C2412_IISMOD_RCLK_256FS;
489 break;
490
491 case 384:
492 div = S3C2412_IISMOD_RCLK_384FS;
493 break;
494
495 case 512:
496 div = S3C2412_IISMOD_RCLK_512FS;
497 break;
498
499 case 768:
500 div = S3C2412_IISMOD_RCLK_768FS;
501 break;
502
503 default:
504 return -EINVAL;
505 }
506
507 reg = readl(i2s->regs + S3C2412_IISMOD);
508 reg &= ~S3C2412_IISMOD_RCLK_MASK;
509 writel(reg | div, i2s->regs + S3C2412_IISMOD);
510 pr_debug("%s: MOD=%08x\n", __func__, readl(i2s->regs + S3C2412_IISMOD));
511 break;
512
513 case S3C_I2SV2_DIV_PRESCALER:
514 if (div >= 0) {
515 writel((div << 8) | S3C2412_IISPSR_PSREN,
516 i2s->regs + S3C2412_IISPSR);
517 } else {
518 writel(0x0, i2s->regs + S3C2412_IISPSR);
519 }
520 pr_debug("%s: PSR=%08x\n", __func__, readl(i2s->regs + S3C2412_IISPSR));
521 break;
522
523 default:
524 return -EINVAL;
525 }
526
527 return 0;
528 }
529
s3c2412_i2s_delay(struct snd_pcm_substream * substream,struct snd_soc_dai * dai)530 static snd_pcm_sframes_t s3c2412_i2s_delay(struct snd_pcm_substream *substream,
531 struct snd_soc_dai *dai)
532 {
533 struct s3c_i2sv2_info *i2s = to_info(dai);
534 u32 reg = readl(i2s->regs + S3C2412_IISFIC);
535 snd_pcm_sframes_t delay;
536
537 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
538 delay = S3C2412_IISFIC_TXCOUNT(reg);
539 else
540 delay = S3C2412_IISFIC_RXCOUNT(reg);
541
542 return delay;
543 }
544
s3c_i2sv2_get_clock(struct snd_soc_dai * cpu_dai)545 struct clk *s3c_i2sv2_get_clock(struct snd_soc_dai *cpu_dai)
546 {
547 struct s3c_i2sv2_info *i2s = to_info(cpu_dai);
548 u32 iismod = readl(i2s->regs + S3C2412_IISMOD);
549
550 if (iismod & S3C2412_IISMOD_IMS_SYSMUX)
551 return i2s->iis_cclk;
552 else
553 return i2s->iis_pclk;
554 }
555 EXPORT_SYMBOL_GPL(s3c_i2sv2_get_clock);
556
557 /* default table of all avaialable root fs divisors */
558 static unsigned int iis_fs_tab[] = { 256, 512, 384, 768 };
559
s3c_i2sv2_iis_calc_rate(struct s3c_i2sv2_rate_calc * info,unsigned int * fstab,unsigned int rate,struct clk * clk)560 int s3c_i2sv2_iis_calc_rate(struct s3c_i2sv2_rate_calc *info,
561 unsigned int *fstab,
562 unsigned int rate, struct clk *clk)
563 {
564 unsigned long clkrate = clk_get_rate(clk);
565 unsigned int div;
566 unsigned int fsclk;
567 unsigned int actual;
568 unsigned int fs;
569 unsigned int fsdiv;
570 signed int deviation = 0;
571 unsigned int best_fs = 0;
572 unsigned int best_div = 0;
573 unsigned int best_rate = 0;
574 unsigned int best_deviation = INT_MAX;
575
576 pr_debug("Input clock rate %ldHz\n", clkrate);
577
578 if (fstab == NULL)
579 fstab = iis_fs_tab;
580
581 for (fs = 0; fs < ARRAY_SIZE(iis_fs_tab); fs++) {
582 fsdiv = iis_fs_tab[fs];
583
584 fsclk = clkrate / fsdiv;
585 div = fsclk / rate;
586
587 if ((fsclk % rate) > (rate / 2))
588 div++;
589
590 if (div <= 1)
591 continue;
592
593 actual = clkrate / (fsdiv * div);
594 deviation = actual - rate;
595
596 printk(KERN_DEBUG "%ufs: div %u => result %u, deviation %d\n",
597 fsdiv, div, actual, deviation);
598
599 deviation = abs(deviation);
600
601 if (deviation < best_deviation) {
602 best_fs = fsdiv;
603 best_div = div;
604 best_rate = actual;
605 best_deviation = deviation;
606 }
607
608 if (deviation == 0)
609 break;
610 }
611
612 printk(KERN_DEBUG "best: fs=%u, div=%u, rate=%u\n",
613 best_fs, best_div, best_rate);
614
615 info->fs_div = best_fs;
616 info->clk_div = best_div;
617
618 return 0;
619 }
620 EXPORT_SYMBOL_GPL(s3c_i2sv2_iis_calc_rate);
621
s3c_i2sv2_probe(struct snd_soc_dai * dai,struct s3c_i2sv2_info * i2s,unsigned long base)622 int s3c_i2sv2_probe(struct snd_soc_dai *dai,
623 struct s3c_i2sv2_info *i2s,
624 unsigned long base)
625 {
626 struct device *dev = dai->dev;
627 unsigned int iismod;
628
629 i2s->dev = dev;
630
631 /* record our i2s structure for later use in the callbacks */
632 snd_soc_dai_set_drvdata(dai, i2s);
633
634 i2s->iis_pclk = clk_get(dev, "iis");
635 if (IS_ERR(i2s->iis_pclk)) {
636 dev_err(dev, "failed to get iis_clock\n");
637 return -ENOENT;
638 }
639
640 clk_prepare_enable(i2s->iis_pclk);
641
642 /* Mark ourselves as in TXRX mode so we can run through our cleanup
643 * process without warnings. */
644 iismod = readl(i2s->regs + S3C2412_IISMOD);
645 iismod |= S3C2412_IISMOD_MODE_TXRX;
646 writel(iismod, i2s->regs + S3C2412_IISMOD);
647 s3c2412_snd_txctrl(i2s, 0);
648 s3c2412_snd_rxctrl(i2s, 0);
649
650 return 0;
651 }
652 EXPORT_SYMBOL_GPL(s3c_i2sv2_probe);
653
s3c_i2sv2_cleanup(struct snd_soc_dai * dai,struct s3c_i2sv2_info * i2s)654 void s3c_i2sv2_cleanup(struct snd_soc_dai *dai,
655 struct s3c_i2sv2_info *i2s)
656 {
657 clk_disable_unprepare(i2s->iis_pclk);
658 clk_put(i2s->iis_pclk);
659 i2s->iis_pclk = NULL;
660 }
661 EXPORT_SYMBOL_GPL(s3c_i2sv2_cleanup);
662
663 #ifdef CONFIG_PM
s3c2412_i2s_suspend(struct snd_soc_dai * dai)664 static int s3c2412_i2s_suspend(struct snd_soc_dai *dai)
665 {
666 struct s3c_i2sv2_info *i2s = to_info(dai);
667 u32 iismod;
668
669 if (dai->active) {
670 i2s->suspend_iismod = readl(i2s->regs + S3C2412_IISMOD);
671 i2s->suspend_iiscon = readl(i2s->regs + S3C2412_IISCON);
672 i2s->suspend_iispsr = readl(i2s->regs + S3C2412_IISPSR);
673
674 /* some basic suspend checks */
675
676 iismod = readl(i2s->regs + S3C2412_IISMOD);
677
678 if (iismod & S3C2412_IISCON_RXDMA_ACTIVE)
679 pr_warning("%s: RXDMA active?\n", __func__);
680
681 if (iismod & S3C2412_IISCON_TXDMA_ACTIVE)
682 pr_warning("%s: TXDMA active?\n", __func__);
683
684 if (iismod & S3C2412_IISCON_IIS_ACTIVE)
685 pr_warning("%s: IIS active\n", __func__);
686 }
687
688 return 0;
689 }
690
s3c2412_i2s_resume(struct snd_soc_dai * dai)691 static int s3c2412_i2s_resume(struct snd_soc_dai *dai)
692 {
693 struct s3c_i2sv2_info *i2s = to_info(dai);
694
695 pr_info("dai_active %d, IISMOD %08x, IISCON %08x\n",
696 dai->active, i2s->suspend_iismod, i2s->suspend_iiscon);
697
698 if (dai->active) {
699 writel(i2s->suspend_iiscon, i2s->regs + S3C2412_IISCON);
700 writel(i2s->suspend_iismod, i2s->regs + S3C2412_IISMOD);
701 writel(i2s->suspend_iispsr, i2s->regs + S3C2412_IISPSR);
702
703 writel(S3C2412_IISFIC_RXFLUSH | S3C2412_IISFIC_TXFLUSH,
704 i2s->regs + S3C2412_IISFIC);
705
706 ndelay(250);
707 writel(0x0, i2s->regs + S3C2412_IISFIC);
708 }
709
710 return 0;
711 }
712 #else
713 #define s3c2412_i2s_suspend NULL
714 #define s3c2412_i2s_resume NULL
715 #endif
716
s3c_i2sv2_register_component(struct device * dev,int id,const struct snd_soc_component_driver * cmp_drv,struct snd_soc_dai_driver * dai_drv)717 int s3c_i2sv2_register_component(struct device *dev, int id,
718 const struct snd_soc_component_driver *cmp_drv,
719 struct snd_soc_dai_driver *dai_drv)
720 {
721 struct snd_soc_dai_ops *ops = (struct snd_soc_dai_ops *)dai_drv->ops;
722
723 ops->trigger = s3c2412_i2s_trigger;
724 if (!ops->hw_params)
725 ops->hw_params = s3c_i2sv2_hw_params;
726 ops->set_fmt = s3c2412_i2s_set_fmt;
727 ops->set_clkdiv = s3c2412_i2s_set_clkdiv;
728 ops->set_sysclk = s3c_i2sv2_set_sysclk;
729
730 /* Allow overriding by (for example) IISv4 */
731 if (!ops->delay)
732 ops->delay = s3c2412_i2s_delay;
733
734 dai_drv->suspend = s3c2412_i2s_suspend;
735 dai_drv->resume = s3c2412_i2s_resume;
736
737 return devm_snd_soc_register_component(dev, cmp_drv, dai_drv, 1);
738 }
739 EXPORT_SYMBOL_GPL(s3c_i2sv2_register_component);
740
741 MODULE_LICENSE("GPL");
742