1 /* sound/soc/s3c24xx/s3c-i2c-v2.c
3 * ALSA Soc Audio Layer - I2S core for newer Samsung SoCs.
5 * Copyright (c) 2006 Wolfson Microelectronics PLC.
6 * Graeme Gregory graeme.gregory@wolfsonmicro.com
7 * linux@wolfsonmicro.com
9 * Copyright (c) 2008, 2007, 2004-2005 Simtec Electronics
10 * http://armlinux.simtec.co.uk/
11 * Ben Dooks <ben@simtec.co.uk>
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.
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>
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>
33 #include <plat/regs-s3c2412-iis.h>
35 #include <plat/audio.h>
38 #include "s3c-i2s-v2.h"
40 #define S3C2412_I2S_DEBUG_CON 0
42 static inline struct s3c_i2sv2_info *to_info(struct snd_soc_dai *cpu_dai)
44 return cpu_dai->private_data;
47 #define bit_set(v, b) (((v) & (b)) ? 1 : 0)
49 #if S3C2412_I2S_DEBUG_CON
50 static void dbg_showcon(const char *fn, u32 con)
52 printk(KERN_DEBUG "%s: LRI=%d, TXFEMPT=%d, RXFEMPT=%d, TXFFULL=%d, RXFFULL=%d\n", fn,
53 bit_set(con, S3C2412_IISCON_LRINDEX),
54 bit_set(con, S3C2412_IISCON_TXFIFO_EMPTY),
55 bit_set(con, S3C2412_IISCON_RXFIFO_EMPTY),
56 bit_set(con, S3C2412_IISCON_TXFIFO_FULL),
57 bit_set(con, S3C2412_IISCON_RXFIFO_FULL));
59 printk(KERN_DEBUG "%s: PAUSE: TXDMA=%d, RXDMA=%d, TXCH=%d, RXCH=%d\n",
61 bit_set(con, S3C2412_IISCON_TXDMA_PAUSE),
62 bit_set(con, S3C2412_IISCON_RXDMA_PAUSE),
63 bit_set(con, S3C2412_IISCON_TXCH_PAUSE),
64 bit_set(con, S3C2412_IISCON_RXCH_PAUSE));
65 printk(KERN_DEBUG "%s: ACTIVE: TXDMA=%d, RXDMA=%d, IIS=%d\n", fn,
66 bit_set(con, S3C2412_IISCON_TXDMA_ACTIVE),
67 bit_set(con, S3C2412_IISCON_RXDMA_ACTIVE),
68 bit_set(con, S3C2412_IISCON_IIS_ACTIVE));
71 static inline void dbg_showcon(const char *fn, u32 con)
77 /* Turn on or off the transmission path. */
78 void s3c2412_snd_txctrl(struct s3c_i2sv2_info *i2s, int on)
80 void __iomem *regs = i2s->regs;
83 pr_debug("%s(%d)\n", __func__, on);
85 fic = readl(regs + S3C2412_IISFIC);
86 con = readl(regs + S3C2412_IISCON);
87 mod = readl(regs + S3C2412_IISMOD);
89 pr_debug("%s: IIS: CON=%x MOD=%x FIC=%x\n", __func__, con, mod, fic);
92 con |= S3C2412_IISCON_TXDMA_ACTIVE | S3C2412_IISCON_IIS_ACTIVE;
93 con &= ~S3C2412_IISCON_TXDMA_PAUSE;
94 con &= ~S3C2412_IISCON_TXCH_PAUSE;
96 switch (mod & S3C2412_IISMOD_MODE_MASK) {
97 case S3C2412_IISMOD_MODE_TXONLY:
98 case S3C2412_IISMOD_MODE_TXRX:
99 /* do nothing, we are in the right mode */
102 case S3C2412_IISMOD_MODE_RXONLY:
103 mod &= ~S3C2412_IISMOD_MODE_MASK;
104 mod |= S3C2412_IISMOD_MODE_TXRX;
108 dev_err(i2s->dev, "TXEN: Invalid MODE in IISMOD\n");
111 writel(con, regs + S3C2412_IISCON);
112 writel(mod, regs + S3C2412_IISMOD);
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.
119 con |= S3C2412_IISCON_TXDMA_PAUSE;
120 con |= S3C2412_IISCON_TXCH_PAUSE;
121 con &= ~S3C2412_IISCON_TXDMA_ACTIVE;
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;
129 case S3C2412_IISMOD_MODE_TXONLY:
130 mod &= ~S3C2412_IISMOD_MODE_MASK;
131 con &= ~S3C2412_IISCON_IIS_ACTIVE;
135 dev_err(i2s->dev, "TXDIS: Invalid MODE in IISMOD\n");
138 writel(mod, regs + S3C2412_IISMOD);
139 writel(con, regs + S3C2412_IISCON);
142 fic = readl(regs + S3C2412_IISFIC);
143 dbg_showcon(__func__, con);
144 pr_debug("%s: IIS: CON=%x MOD=%x FIC=%x\n", __func__, con, mod, fic);
146 EXPORT_SYMBOL_GPL(s3c2412_snd_txctrl);
148 void s3c2412_snd_rxctrl(struct s3c_i2sv2_info *i2s, int on)
150 void __iomem *regs = i2s->regs;
153 pr_debug("%s(%d)\n", __func__, on);
155 fic = readl(regs + S3C2412_IISFIC);
156 con = readl(regs + S3C2412_IISCON);
157 mod = readl(regs + S3C2412_IISMOD);
159 pr_debug("%s: IIS: CON=%x MOD=%x FIC=%x\n", __func__, con, mod, fic);
162 con |= S3C2412_IISCON_RXDMA_ACTIVE | S3C2412_IISCON_IIS_ACTIVE;
163 con &= ~S3C2412_IISCON_RXDMA_PAUSE;
164 con &= ~S3C2412_IISCON_RXCH_PAUSE;
166 switch (mod & S3C2412_IISMOD_MODE_MASK) {
167 case S3C2412_IISMOD_MODE_TXRX:
168 case S3C2412_IISMOD_MODE_RXONLY:
169 /* do nothing, we are in the right mode */
172 case S3C2412_IISMOD_MODE_TXONLY:
173 mod &= ~S3C2412_IISMOD_MODE_MASK;
174 mod |= S3C2412_IISMOD_MODE_TXRX;
178 dev_err(i2s->dev, "RXEN: Invalid MODE in IISMOD\n");
181 writel(mod, regs + S3C2412_IISMOD);
182 writel(con, regs + S3C2412_IISCON);
184 /* See txctrl notes on FIFOs. */
186 con &= ~S3C2412_IISCON_RXDMA_ACTIVE;
187 con |= S3C2412_IISCON_RXDMA_PAUSE;
188 con |= S3C2412_IISCON_RXCH_PAUSE;
190 switch (mod & S3C2412_IISMOD_MODE_MASK) {
191 case S3C2412_IISMOD_MODE_RXONLY:
192 con &= ~S3C2412_IISCON_IIS_ACTIVE;
193 mod &= ~S3C2412_IISMOD_MODE_MASK;
196 case S3C2412_IISMOD_MODE_TXRX:
197 mod &= ~S3C2412_IISMOD_MODE_MASK;
198 mod |= S3C2412_IISMOD_MODE_TXONLY;
202 dev_err(i2s->dev, "RXEN: Invalid MODE in IISMOD\n");
205 writel(con, regs + S3C2412_IISCON);
206 writel(mod, regs + S3C2412_IISMOD);
209 fic = readl(regs + S3C2412_IISFIC);
210 pr_debug("%s: IIS: CON=%x MOD=%x FIC=%x\n", __func__, con, mod, fic);
212 EXPORT_SYMBOL_GPL(s3c2412_snd_rxctrl);
215 * Wait for the LR signal to allow synchronisation to the L/R clock
216 * from the codec. May only be needed for slave mode.
218 static int s3c2412_snd_lrsync(struct s3c_i2sv2_info *i2s)
221 unsigned long timeout = jiffies + msecs_to_jiffies(5);
223 pr_debug("Entered %s\n", __func__);
226 iiscon = readl(i2s->regs + S3C2412_IISCON);
227 if (iiscon & S3C2412_IISCON_LRINDEX)
230 if (timeout < jiffies) {
231 printk(KERN_ERR "%s: timeout\n", __func__);
240 * Set S3C2412 I2S DAI format
242 static int s3c2412_i2s_set_fmt(struct snd_soc_dai *cpu_dai,
245 struct s3c_i2sv2_info *i2s = to_info(cpu_dai);
248 pr_debug("Entered %s\n", __func__);
250 iismod = readl(i2s->regs + S3C2412_IISMOD);
251 pr_debug("hw_params r: IISMOD: %x \n", iismod);
253 #if defined(CONFIG_CPU_S3C2412) || defined(CONFIG_CPU_S3C2413)
254 #define IISMOD_MASTER_MASK S3C2412_IISMOD_MASTER_MASK
255 #define IISMOD_SLAVE S3C2412_IISMOD_SLAVE
256 #define IISMOD_MASTER S3C2412_IISMOD_MASTER_INTERNAL
259 #if defined(CONFIG_PLAT_S3C64XX)
260 /* From Rev1.1 datasheet, we have two master and two slave modes:
262 * 00 = master mode, fed from PCLK
263 * 01 = master mode, fed from CLKAUDIO
264 * 10 = slave mode, using PCLK
265 * 11 = slave mode, using I2SCLK
267 #define IISMOD_MASTER_MASK (1 << 11)
268 #define IISMOD_SLAVE (1 << 11)
269 #define IISMOD_MASTER (0x0)
272 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
273 case SND_SOC_DAIFMT_CBM_CFM:
275 iismod &= ~IISMOD_MASTER_MASK;
276 iismod |= IISMOD_SLAVE;
278 case SND_SOC_DAIFMT_CBS_CFS:
280 iismod &= ~IISMOD_MASTER_MASK;
281 iismod |= IISMOD_MASTER;
284 pr_debug("unknwon master/slave format\n");
288 iismod &= ~S3C2412_IISMOD_SDF_MASK;
290 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
291 case SND_SOC_DAIFMT_RIGHT_J:
292 iismod |= S3C2412_IISMOD_SDF_MSB;
294 case SND_SOC_DAIFMT_LEFT_J:
295 iismod |= S3C2412_IISMOD_SDF_LSB;
297 case SND_SOC_DAIFMT_I2S:
298 iismod |= S3C2412_IISMOD_SDF_IIS;
301 pr_debug("Unknown data format\n");
305 writel(iismod, i2s->regs + S3C2412_IISMOD);
306 pr_debug("hw_params w: IISMOD: %x \n", iismod);
310 static int s3c2412_i2s_hw_params(struct snd_pcm_substream *substream,
311 struct snd_pcm_hw_params *params,
312 struct snd_soc_dai *socdai)
314 struct snd_soc_pcm_runtime *rtd = substream->private_data;
315 struct snd_soc_dai_link *dai = rtd->dai;
316 struct s3c_i2sv2_info *i2s = to_info(dai->cpu_dai);
319 pr_debug("Entered %s\n", __func__);
321 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
322 dai->cpu_dai->dma_data = i2s->dma_playback;
324 dai->cpu_dai->dma_data = i2s->dma_capture;
326 /* Working copies of register */
327 iismod = readl(i2s->regs + S3C2412_IISMOD);
328 pr_debug("%s: r: IISMOD: %x\n", __func__, iismod);
330 switch (params_format(params)) {
331 case SNDRV_PCM_FORMAT_S8:
332 iismod |= S3C2412_IISMOD_8BIT;
334 case SNDRV_PCM_FORMAT_S16_LE:
335 iismod &= ~S3C2412_IISMOD_8BIT;
339 writel(iismod, i2s->regs + S3C2412_IISMOD);
340 pr_debug("%s: w: IISMOD: %x\n", __func__, iismod);
344 static int s3c2412_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
345 struct snd_soc_dai *dai)
347 struct snd_soc_pcm_runtime *rtd = substream->private_data;
348 struct s3c_i2sv2_info *i2s = to_info(rtd->dai->cpu_dai);
349 int capture = (substream->stream == SNDRV_PCM_STREAM_CAPTURE);
353 pr_debug("Entered %s\n", __func__);
356 case SNDRV_PCM_TRIGGER_START:
357 /* On start, ensure that the FIFOs are cleared and reset. */
359 writel(capture ? S3C2412_IISFIC_RXFLUSH : S3C2412_IISFIC_TXFLUSH,
360 i2s->regs + S3C2412_IISFIC);
362 /* clear again, just in case */
363 writel(0x0, i2s->regs + S3C2412_IISFIC);
365 case SNDRV_PCM_TRIGGER_RESUME:
366 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
368 ret = s3c2412_snd_lrsync(i2s);
373 local_irq_save(irqs);
376 s3c2412_snd_rxctrl(i2s, 1);
378 s3c2412_snd_txctrl(i2s, 1);
380 local_irq_restore(irqs);
383 case SNDRV_PCM_TRIGGER_STOP:
384 case SNDRV_PCM_TRIGGER_SUSPEND:
385 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
386 local_irq_save(irqs);
389 s3c2412_snd_rxctrl(i2s, 0);
391 s3c2412_snd_txctrl(i2s, 0);
393 local_irq_restore(irqs);
405 * Set S3C2412 Clock dividers
407 static int s3c2412_i2s_set_clkdiv(struct snd_soc_dai *cpu_dai,
410 struct s3c_i2sv2_info *i2s = to_info(cpu_dai);
413 pr_debug("%s(%p, %d, %d)\n", __func__, cpu_dai, div_id, div);
416 case S3C_I2SV2_DIV_BCLK:
417 reg = readl(i2s->regs + S3C2412_IISMOD);
418 reg &= ~S3C2412_IISMOD_BCLK_MASK;
419 writel(reg | div, i2s->regs + S3C2412_IISMOD);
421 pr_debug("%s: MOD=%08x\n", __func__, readl(i2s->regs + S3C2412_IISMOD));
424 case S3C_I2SV2_DIV_RCLK:
426 /* convert value to bit field */
430 div = S3C2412_IISMOD_RCLK_256FS;
434 div = S3C2412_IISMOD_RCLK_384FS;
438 div = S3C2412_IISMOD_RCLK_512FS;
442 div = S3C2412_IISMOD_RCLK_768FS;
450 reg = readl(i2s->regs + S3C2412_IISMOD);
451 reg &= ~S3C2412_IISMOD_RCLK_MASK;
452 writel(reg | div, i2s->regs + S3C2412_IISMOD);
453 pr_debug("%s: MOD=%08x\n", __func__, readl(i2s->regs + S3C2412_IISMOD));
456 case S3C_I2SV2_DIV_PRESCALER:
458 writel((div << 8) | S3C2412_IISPSR_PSREN,
459 i2s->regs + S3C2412_IISPSR);
461 writel(0x0, i2s->regs + S3C2412_IISPSR);
463 pr_debug("%s: PSR=%08x\n", __func__, readl(i2s->regs + S3C2412_IISPSR));
473 /* default table of all avaialable root fs divisors */
474 static unsigned int iis_fs_tab[] = { 256, 512, 384, 768 };
476 int s3c2412_iis_calc_rate(struct s3c_i2sv2_rate_calc *info,
478 unsigned int rate, struct clk *clk)
480 unsigned long clkrate = clk_get_rate(clk);
486 signed int deviation = 0;
487 unsigned int best_fs = 0;
488 unsigned int best_div = 0;
489 unsigned int best_rate = 0;
490 unsigned int best_deviation = INT_MAX;
495 for (fs = 0; fs < ARRAY_SIZE(iis_fs_tab); fs++) {
496 fsdiv = iis_fs_tab[fs];
498 fsclk = clkrate / fsdiv;
501 if ((fsclk % rate) > (rate / 2))
507 actual = clkrate / (fsdiv * div);
508 deviation = actual - rate;
510 printk(KERN_DEBUG "%dfs: div %d => result %d, deviation %d\n",
511 fsdiv, div, actual, deviation);
513 deviation = abs(deviation);
515 if (deviation < best_deviation) {
519 best_deviation = deviation;
526 printk(KERN_DEBUG "best: fs=%d, div=%d, rate=%d\n",
527 best_fs, best_div, best_rate);
529 info->fs_div = best_fs;
530 info->clk_div = best_div;
534 EXPORT_SYMBOL_GPL(s3c2412_iis_calc_rate);
536 int s3c_i2sv2_probe(struct platform_device *pdev,
537 struct snd_soc_dai *dai,
538 struct s3c_i2sv2_info *i2s,
541 struct device *dev = &pdev->dev;
545 /* record our i2s structure for later use in the callbacks */
546 dai->private_data = i2s;
548 i2s->regs = ioremap(base, 0x100);
549 if (i2s->regs == NULL) {
550 dev_err(dev, "cannot ioremap registers\n");
554 i2s->iis_pclk = clk_get(dev, "iis");
555 if (i2s->iis_pclk == NULL) {
556 dev_err(dev, "failed to get iis_clock\n");
561 clk_enable(i2s->iis_pclk);
563 s3c2412_snd_txctrl(i2s, 0);
564 s3c2412_snd_rxctrl(i2s, 0);
569 EXPORT_SYMBOL_GPL(s3c_i2sv2_probe);
572 static int s3c2412_i2s_suspend(struct snd_soc_dai *dai)
574 struct s3c_i2sv2_info *i2s = to_info(dai);
578 i2s->suspend_iismod = readl(i2s->regs + S3C2412_IISMOD);
579 i2s->suspend_iiscon = readl(i2s->regs + S3C2412_IISCON);
580 i2s->suspend_iispsr = readl(i2s->regs + S3C2412_IISPSR);
582 /* some basic suspend checks */
584 iismod = readl(i2s->regs + S3C2412_IISMOD);
586 if (iismod & S3C2412_IISCON_RXDMA_ACTIVE)
587 pr_warning("%s: RXDMA active?\n", __func__);
589 if (iismod & S3C2412_IISCON_TXDMA_ACTIVE)
590 pr_warning("%s: TXDMA active?\n", __func__);
592 if (iismod & S3C2412_IISCON_IIS_ACTIVE)
593 pr_warning("%s: IIS active\n", __func__);
599 static int s3c2412_i2s_resume(struct snd_soc_dai *dai)
601 struct s3c_i2sv2_info *i2s = to_info(dai);
603 pr_info("dai_active %d, IISMOD %08x, IISCON %08x\n",
604 dai->active, i2s->suspend_iismod, i2s->suspend_iiscon);
607 writel(i2s->suspend_iiscon, i2s->regs + S3C2412_IISCON);
608 writel(i2s->suspend_iismod, i2s->regs + S3C2412_IISMOD);
609 writel(i2s->suspend_iispsr, i2s->regs + S3C2412_IISPSR);
611 writel(S3C2412_IISFIC_RXFLUSH | S3C2412_IISFIC_TXFLUSH,
612 i2s->regs + S3C2412_IISFIC);
615 writel(0x0, i2s->regs + S3C2412_IISFIC);
621 #define s3c2412_i2s_suspend NULL
622 #define s3c2412_i2s_resume NULL
625 int s3c_i2sv2_register_dai(struct snd_soc_dai *dai)
627 dai->ops.trigger = s3c2412_i2s_trigger;
628 dai->ops.hw_params = s3c2412_i2s_hw_params;
629 dai->ops.set_fmt = s3c2412_i2s_set_fmt;
630 dai->ops.set_clkdiv = s3c2412_i2s_set_clkdiv;
632 dai->suspend = s3c2412_i2s_suspend;
633 dai->resume = s3c2412_i2s_resume;
635 return snd_soc_register_dai(dai);
638 EXPORT_SYMBOL_GPL(s3c_i2sv2_register_dai);