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linux/sound/soc/s3c24xx/s3c-i2s-v2.c

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/* sound/soc/s3c24xx/s3c-i2c-v2.c
*
* ALSA Soc Audio Layer - I2S core for newer Samsung SoCs.
*
* Copyright (c) 2006 Wolfson Microelectronics PLC.
* Graeme Gregory graeme.gregory@wolfsonmicro.com
* linux@wolfsonmicro.com
*
* Copyright (c) 2008, 2007, 2004-2005 Simtec Electronics
* http://armlinux.simtec.co.uk/
* Ben Dooks <ben@simtec.co.uk>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/clk.h>
#include <linux/kernel.h>
#include <linux/io.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/initval.h>
#include <sound/soc.h>
#include <plat/regs-s3c2412-iis.h>
#include <plat/audio.h>
#include <mach/dma.h>
#include "s3c-i2s-v2.h"
#undef S3C_IIS_V2_SUPPORTED
#if defined(CONFIG_CPU_S3C2412) || defined(CONFIG_CPU_S3C2413)
#define S3C_IIS_V2_SUPPORTED
#endif
#ifdef CONFIG_PLAT_S3C64XX
#define S3C_IIS_V2_SUPPORTED
#endif
#ifndef S3C_IIS_V2_SUPPORTED
#error Unsupported CPU model
#endif
#define S3C2412_I2S_DEBUG_CON 0
static inline struct s3c_i2sv2_info *to_info(struct snd_soc_dai *cpu_dai)
{
return cpu_dai->private_data;
}
#define bit_set(v, b) (((v) & (b)) ? 1 : 0)
#if S3C2412_I2S_DEBUG_CON
static void dbg_showcon(const char *fn, u32 con)
{
printk(KERN_DEBUG "%s: LRI=%d, TXFEMPT=%d, RXFEMPT=%d, TXFFULL=%d, RXFFULL=%d\n", fn,
bit_set(con, S3C2412_IISCON_LRINDEX),
bit_set(con, S3C2412_IISCON_TXFIFO_EMPTY),
bit_set(con, S3C2412_IISCON_RXFIFO_EMPTY),
bit_set(con, S3C2412_IISCON_TXFIFO_FULL),
bit_set(con, S3C2412_IISCON_RXFIFO_FULL));
printk(KERN_DEBUG "%s: PAUSE: TXDMA=%d, RXDMA=%d, TXCH=%d, RXCH=%d\n",
fn,
bit_set(con, S3C2412_IISCON_TXDMA_PAUSE),
bit_set(con, S3C2412_IISCON_RXDMA_PAUSE),
bit_set(con, S3C2412_IISCON_TXCH_PAUSE),
bit_set(con, S3C2412_IISCON_RXCH_PAUSE));
printk(KERN_DEBUG "%s: ACTIVE: TXDMA=%d, RXDMA=%d, IIS=%d\n", fn,
bit_set(con, S3C2412_IISCON_TXDMA_ACTIVE),
bit_set(con, S3C2412_IISCON_RXDMA_ACTIVE),
bit_set(con, S3C2412_IISCON_IIS_ACTIVE));
}
#else
static inline void dbg_showcon(const char *fn, u32 con)
{
}
#endif
/* Turn on or off the transmission path. */
static void s3c2412_snd_txctrl(struct s3c_i2sv2_info *i2s, int on)
{
void __iomem *regs = i2s->regs;
u32 fic, con, mod;
pr_debug("%s(%d)\n", __func__, on);
fic = readl(regs + S3C2412_IISFIC);
con = readl(regs + S3C2412_IISCON);
mod = readl(regs + S3C2412_IISMOD);
pr_debug("%s: IIS: CON=%x MOD=%x FIC=%x\n", __func__, con, mod, fic);
if (on) {
con |= S3C2412_IISCON_TXDMA_ACTIVE | S3C2412_IISCON_IIS_ACTIVE;
con &= ~S3C2412_IISCON_TXDMA_PAUSE;
con &= ~S3C2412_IISCON_TXCH_PAUSE;
switch (mod & S3C2412_IISMOD_MODE_MASK) {
case S3C2412_IISMOD_MODE_TXONLY:
case S3C2412_IISMOD_MODE_TXRX:
/* do nothing, we are in the right mode */
break;
case S3C2412_IISMOD_MODE_RXONLY:
mod &= ~S3C2412_IISMOD_MODE_MASK;
mod |= S3C2412_IISMOD_MODE_TXRX;
break;
default:
dev_err(i2s->dev, "TXEN: Invalid MODE %x in IISMOD\n",
mod & S3C2412_IISMOD_MODE_MASK);
break;
}
writel(con, regs + S3C2412_IISCON);
writel(mod, regs + S3C2412_IISMOD);
} else {
/* Note, we do not have any indication that the FIFO problems
* tha the S3C2410/2440 had apply here, so we should be able
* to disable the DMA and TX without resetting the FIFOS.
*/
con |= S3C2412_IISCON_TXDMA_PAUSE;
con |= S3C2412_IISCON_TXCH_PAUSE;
con &= ~S3C2412_IISCON_TXDMA_ACTIVE;
switch (mod & S3C2412_IISMOD_MODE_MASK) {
case S3C2412_IISMOD_MODE_TXRX:
mod &= ~S3C2412_IISMOD_MODE_MASK;
mod |= S3C2412_IISMOD_MODE_RXONLY;
break;
case S3C2412_IISMOD_MODE_TXONLY:
mod &= ~S3C2412_IISMOD_MODE_MASK;
con &= ~S3C2412_IISCON_IIS_ACTIVE;
break;
default:
dev_err(i2s->dev, "TXDIS: Invalid MODE %x in IISMOD\n",
mod & S3C2412_IISMOD_MODE_MASK);
break;
}
writel(mod, regs + S3C2412_IISMOD);
writel(con, regs + S3C2412_IISCON);
}
fic = readl(regs + S3C2412_IISFIC);
dbg_showcon(__func__, con);
pr_debug("%s: IIS: CON=%x MOD=%x FIC=%x\n", __func__, con, mod, fic);
}
static void s3c2412_snd_rxctrl(struct s3c_i2sv2_info *i2s, int on)
{
void __iomem *regs = i2s->regs;
u32 fic, con, mod;
pr_debug("%s(%d)\n", __func__, on);
fic = readl(regs + S3C2412_IISFIC);
con = readl(regs + S3C2412_IISCON);
mod = readl(regs + S3C2412_IISMOD);
pr_debug("%s: IIS: CON=%x MOD=%x FIC=%x\n", __func__, con, mod, fic);
if (on) {
con |= S3C2412_IISCON_RXDMA_ACTIVE | S3C2412_IISCON_IIS_ACTIVE;
con &= ~S3C2412_IISCON_RXDMA_PAUSE;
con &= ~S3C2412_IISCON_RXCH_PAUSE;
switch (mod & S3C2412_IISMOD_MODE_MASK) {
case S3C2412_IISMOD_MODE_TXRX:
case S3C2412_IISMOD_MODE_RXONLY:
/* do nothing, we are in the right mode */
break;
case S3C2412_IISMOD_MODE_TXONLY:
mod &= ~S3C2412_IISMOD_MODE_MASK;
mod |= S3C2412_IISMOD_MODE_TXRX;
break;
default:
dev_err(i2s->dev, "RXEN: Invalid MODE %x in IISMOD\n",
mod & S3C2412_IISMOD_MODE_MASK);
}
writel(mod, regs + S3C2412_IISMOD);
writel(con, regs + S3C2412_IISCON);
} else {
/* See txctrl notes on FIFOs. */
con &= ~S3C2412_IISCON_RXDMA_ACTIVE;
con |= S3C2412_IISCON_RXDMA_PAUSE;
con |= S3C2412_IISCON_RXCH_PAUSE;
switch (mod & S3C2412_IISMOD_MODE_MASK) {
case S3C2412_IISMOD_MODE_RXONLY:
con &= ~S3C2412_IISCON_IIS_ACTIVE;
mod &= ~S3C2412_IISMOD_MODE_MASK;
break;
case S3C2412_IISMOD_MODE_TXRX:
mod &= ~S3C2412_IISMOD_MODE_MASK;
mod |= S3C2412_IISMOD_MODE_TXONLY;
break;
default:
dev_err(i2s->dev, "RXDIS: Invalid MODE %x in IISMOD\n",
mod & S3C2412_IISMOD_MODE_MASK);
}
writel(con, regs + S3C2412_IISCON);
writel(mod, regs + S3C2412_IISMOD);
}
fic = readl(regs + S3C2412_IISFIC);
pr_debug("%s: IIS: CON=%x MOD=%x FIC=%x\n", __func__, con, mod, fic);
}
/*
* Wait for the LR signal to allow synchronisation to the L/R clock
* from the codec. May only be needed for slave mode.
*/
static int s3c2412_snd_lrsync(struct s3c_i2sv2_info *i2s)
{
u32 iiscon;
unsigned long timeout = jiffies + msecs_to_jiffies(5);
pr_debug("Entered %s\n", __func__);
while (1) {
iiscon = readl(i2s->regs + S3C2412_IISCON);
if (iiscon & S3C2412_IISCON_LRINDEX)
break;
if (timeout < jiffies) {
printk(KERN_ERR "%s: timeout\n", __func__);
return -ETIMEDOUT;
}
}
return 0;
}
/*
* Set S3C2412 I2S DAI format
*/
static int s3c2412_i2s_set_fmt(struct snd_soc_dai *cpu_dai,
unsigned int fmt)
{
struct s3c_i2sv2_info *i2s = to_info(cpu_dai);
u32 iismod;
pr_debug("Entered %s\n", __func__);
iismod = readl(i2s->regs + S3C2412_IISMOD);
pr_debug("hw_params r: IISMOD: %x \n", iismod);
#if defined(CONFIG_CPU_S3C2412) || defined(CONFIG_CPU_S3C2413)
#define IISMOD_MASTER_MASK S3C2412_IISMOD_MASTER_MASK
#define IISMOD_SLAVE S3C2412_IISMOD_SLAVE
#define IISMOD_MASTER S3C2412_IISMOD_MASTER_INTERNAL
#endif
#if defined(CONFIG_PLAT_S3C64XX)
/* From Rev1.1 datasheet, we have two master and two slave modes:
* IMS[11:10]:
* 00 = master mode, fed from PCLK
* 01 = master mode, fed from CLKAUDIO
* 10 = slave mode, using PCLK
* 11 = slave mode, using I2SCLK
*/
#define IISMOD_MASTER_MASK (1 << 11)
#define IISMOD_SLAVE (1 << 11)
#define IISMOD_MASTER (0 << 11)
#endif
switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
case SND_SOC_DAIFMT_CBM_CFM:
i2s->master = 0;
iismod &= ~IISMOD_MASTER_MASK;
iismod |= IISMOD_SLAVE;
break;
case SND_SOC_DAIFMT_CBS_CFS:
i2s->master = 1;
iismod &= ~IISMOD_MASTER_MASK;
iismod |= IISMOD_MASTER;
break;
default:
pr_err("unknwon master/slave format\n");
return -EINVAL;
}
iismod &= ~S3C2412_IISMOD_SDF_MASK;
switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
case SND_SOC_DAIFMT_RIGHT_J:
iismod |= S3C2412_IISMOD_SDF_MSB;
break;
case SND_SOC_DAIFMT_LEFT_J:
iismod |= S3C2412_IISMOD_SDF_LSB;
break;
case SND_SOC_DAIFMT_I2S:
iismod |= S3C2412_IISMOD_SDF_IIS;
break;
default:
pr_err("Unknown data format\n");
return -EINVAL;
}
writel(iismod, i2s->regs + S3C2412_IISMOD);
pr_debug("hw_params w: IISMOD: %x \n", iismod);
return 0;
}
static int s3c2412_i2s_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *socdai)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_soc_dai_link *dai = rtd->dai;
struct s3c_i2sv2_info *i2s = to_info(dai->cpu_dai);
u32 iismod;
pr_debug("Entered %s\n", __func__);
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
dai->cpu_dai->dma_data = i2s->dma_playback;
else
dai->cpu_dai->dma_data = i2s->dma_capture;
/* Working copies of register */
iismod = readl(i2s->regs + S3C2412_IISMOD);
pr_debug("%s: r: IISMOD: %x\n", __func__, iismod);
#if defined(CONFIG_CPU_S3C2412) || defined(CONFIG_CPU_S3C2413)
switch (params_format(params)) {
case SNDRV_PCM_FORMAT_S8:
iismod |= S3C2412_IISMOD_8BIT;
break;
case SNDRV_PCM_FORMAT_S16_LE:
iismod &= ~S3C2412_IISMOD_8BIT;
break;
}
#endif
#ifdef CONFIG_PLAT_S3C64XX
iismod &= ~(S3C64XX_IISMOD_BLC_MASK | S3C2412_IISMOD_BCLK_MASK);
/* Sample size */
switch (params_format(params)) {
case SNDRV_PCM_FORMAT_S8:
/* 8 bit sample, 16fs BCLK */
iismod |= (S3C64XX_IISMOD_BLC_8BIT | S3C2412_IISMOD_BCLK_16FS);
break;
case SNDRV_PCM_FORMAT_S16_LE:
/* 16 bit sample, 32fs BCLK */
break;
case SNDRV_PCM_FORMAT_S24_LE:
/* 24 bit sample, 48fs BCLK */
iismod |= (S3C64XX_IISMOD_BLC_24BIT | S3C2412_IISMOD_BCLK_48FS);
break;
}
#endif
writel(iismod, i2s->regs + S3C2412_IISMOD);
pr_debug("%s: w: IISMOD: %x\n", __func__, iismod);
return 0;
}
static int s3c2412_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
struct snd_soc_dai *dai)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct s3c_i2sv2_info *i2s = to_info(rtd->dai->cpu_dai);
int capture = (substream->stream == SNDRV_PCM_STREAM_CAPTURE);
unsigned long irqs;
int ret = 0;
pr_debug("Entered %s\n", __func__);
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
/* On start, ensure that the FIFOs are cleared and reset. */
writel(capture ? S3C2412_IISFIC_RXFLUSH : S3C2412_IISFIC_TXFLUSH,
i2s->regs + S3C2412_IISFIC);
/* clear again, just in case */
writel(0x0, i2s->regs + S3C2412_IISFIC);
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
if (!i2s->master) {
ret = s3c2412_snd_lrsync(i2s);
if (ret)
goto exit_err;
}
local_irq_save(irqs);
if (capture)
s3c2412_snd_rxctrl(i2s, 1);
else
s3c2412_snd_txctrl(i2s, 1);
local_irq_restore(irqs);
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
local_irq_save(irqs);
if (capture)
s3c2412_snd_rxctrl(i2s, 0);
else
s3c2412_snd_txctrl(i2s, 0);
local_irq_restore(irqs);
break;
default:
ret = -EINVAL;
break;
}
exit_err:
return ret;
}
/*
* Set S3C2412 Clock dividers
*/
static int s3c2412_i2s_set_clkdiv(struct snd_soc_dai *cpu_dai,
int div_id, int div)
{
struct s3c_i2sv2_info *i2s = to_info(cpu_dai);
u32 reg;
pr_debug("%s(%p, %d, %d)\n", __func__, cpu_dai, div_id, div);
switch (div_id) {
case S3C_I2SV2_DIV_BCLK:
reg = readl(i2s->regs + S3C2412_IISMOD);
reg &= ~S3C2412_IISMOD_BCLK_MASK;
writel(reg | div, i2s->regs + S3C2412_IISMOD);
pr_debug("%s: MOD=%08x\n", __func__, readl(i2s->regs + S3C2412_IISMOD));
break;
case S3C_I2SV2_DIV_RCLK:
if (div > 3) {
/* convert value to bit field */
switch (div) {
case 256:
div = S3C2412_IISMOD_RCLK_256FS;
break;
case 384:
div = S3C2412_IISMOD_RCLK_384FS;
break;
case 512:
div = S3C2412_IISMOD_RCLK_512FS;
break;
case 768:
div = S3C2412_IISMOD_RCLK_768FS;
break;
default:
return -EINVAL;
}
}
reg = readl(i2s->regs + S3C2412_IISMOD);
reg &= ~S3C2412_IISMOD_RCLK_MASK;
writel(reg | div, i2s->regs + S3C2412_IISMOD);
pr_debug("%s: MOD=%08x\n", __func__, readl(i2s->regs + S3C2412_IISMOD));
break;
case S3C_I2SV2_DIV_PRESCALER:
if (div >= 0) {
writel((div << 8) | S3C2412_IISPSR_PSREN,
i2s->regs + S3C2412_IISPSR);
} else {
writel(0x0, i2s->regs + S3C2412_IISPSR);
}
pr_debug("%s: PSR=%08x\n", __func__, readl(i2s->regs + S3C2412_IISPSR));
break;
default:
return -EINVAL;
}
return 0;
}
/* default table of all avaialable root fs divisors */
static unsigned int iis_fs_tab[] = { 256, 512, 384, 768 };
int s3c_i2sv2_iis_calc_rate(struct s3c_i2sv2_rate_calc *info,
unsigned int *fstab,
unsigned int rate, struct clk *clk)
{
unsigned long clkrate = clk_get_rate(clk);
unsigned int div;
unsigned int fsclk;
unsigned int actual;
unsigned int fs;
unsigned int fsdiv;
signed int deviation = 0;
unsigned int best_fs = 0;
unsigned int best_div = 0;
unsigned int best_rate = 0;
unsigned int best_deviation = INT_MAX;
pr_debug("Input clock rate %ldHz\n", clkrate);
if (fstab == NULL)
fstab = iis_fs_tab;
for (fs = 0; fs < ARRAY_SIZE(iis_fs_tab); fs++) {
fsdiv = iis_fs_tab[fs];
fsclk = clkrate / fsdiv;
div = fsclk / rate;
if ((fsclk % rate) > (rate / 2))
div++;
if (div <= 1)
continue;
actual = clkrate / (fsdiv * div);
deviation = actual - rate;
printk(KERN_DEBUG "%ufs: div %u => result %u, deviation %d\n",
fsdiv, div, actual, deviation);
deviation = abs(deviation);
if (deviation < best_deviation) {
best_fs = fsdiv;
best_div = div;
best_rate = actual;
best_deviation = deviation;
}
if (deviation == 0)
break;
}
printk(KERN_DEBUG "best: fs=%u, div=%u, rate=%u\n",
best_fs, best_div, best_rate);
info->fs_div = best_fs;
info->clk_div = best_div;
return 0;
}
EXPORT_SYMBOL_GPL(s3c_i2sv2_iis_calc_rate);
int s3c_i2sv2_probe(struct platform_device *pdev,
struct snd_soc_dai *dai,
struct s3c_i2sv2_info *i2s,
unsigned long base)
{
struct device *dev = &pdev->dev;
unsigned int iismod;
i2s->dev = dev;
/* record our i2s structure for later use in the callbacks */
dai->private_data = i2s;
if (!base) {
struct resource *res = platform_get_resource(pdev,
IORESOURCE_MEM,
0);
if (!res) {
dev_err(dev, "Unable to get register resource\n");
return -ENXIO;
}
if (!request_mem_region(res->start, resource_size(res),
"s3c64xx-i2s-v4")) {
dev_err(dev, "Unable to request register region\n");
return -EBUSY;
}
base = res->start;
}
i2s->regs = ioremap(base, 0x100);
if (i2s->regs == NULL) {
dev_err(dev, "cannot ioremap registers\n");
return -ENXIO;
}
i2s->iis_pclk = clk_get(dev, "iis");
if (i2s->iis_pclk == NULL) {
dev_err(dev, "failed to get iis_clock\n");
iounmap(i2s->regs);
return -ENOENT;
}
clk_enable(i2s->iis_pclk);
/* Mark ourselves as in TXRX mode so we can run through our cleanup
* process without warnings. */
iismod = readl(i2s->regs + S3C2412_IISMOD);
iismod |= S3C2412_IISMOD_MODE_TXRX;
writel(iismod, i2s->regs + S3C2412_IISMOD);
s3c2412_snd_txctrl(i2s, 0);
s3c2412_snd_rxctrl(i2s, 0);
return 0;
}
EXPORT_SYMBOL_GPL(s3c_i2sv2_probe);
#ifdef CONFIG_PM
static int s3c2412_i2s_suspend(struct snd_soc_dai *dai)
{
struct s3c_i2sv2_info *i2s = to_info(dai);
u32 iismod;
if (dai->active) {
i2s->suspend_iismod = readl(i2s->regs + S3C2412_IISMOD);
i2s->suspend_iiscon = readl(i2s->regs + S3C2412_IISCON);
i2s->suspend_iispsr = readl(i2s->regs + S3C2412_IISPSR);
/* some basic suspend checks */
iismod = readl(i2s->regs + S3C2412_IISMOD);
if (iismod & S3C2412_IISCON_RXDMA_ACTIVE)
pr_warning("%s: RXDMA active?\n", __func__);
if (iismod & S3C2412_IISCON_TXDMA_ACTIVE)
pr_warning("%s: TXDMA active?\n", __func__);
if (iismod & S3C2412_IISCON_IIS_ACTIVE)
pr_warning("%s: IIS active\n", __func__);
}
return 0;
}
static int s3c2412_i2s_resume(struct snd_soc_dai *dai)
{
struct s3c_i2sv2_info *i2s = to_info(dai);
pr_info("dai_active %d, IISMOD %08x, IISCON %08x\n",
dai->active, i2s->suspend_iismod, i2s->suspend_iiscon);
if (dai->active) {
writel(i2s->suspend_iiscon, i2s->regs + S3C2412_IISCON);
writel(i2s->suspend_iismod, i2s->regs + S3C2412_IISMOD);
writel(i2s->suspend_iispsr, i2s->regs + S3C2412_IISPSR);
writel(S3C2412_IISFIC_RXFLUSH | S3C2412_IISFIC_TXFLUSH,
i2s->regs + S3C2412_IISFIC);
ndelay(250);
writel(0x0, i2s->regs + S3C2412_IISFIC);
}
return 0;
}
#else
#define s3c2412_i2s_suspend NULL
#define s3c2412_i2s_resume NULL
#endif
int s3c_i2sv2_register_dai(struct snd_soc_dai *dai)
{
struct snd_soc_dai_ops *ops = dai->ops;
ops->trigger = s3c2412_i2s_trigger;
ops->hw_params = s3c2412_i2s_hw_params;
ops->set_fmt = s3c2412_i2s_set_fmt;
ops->set_clkdiv = s3c2412_i2s_set_clkdiv;
dai->suspend = s3c2412_i2s_suspend;
dai->resume = s3c2412_i2s_resume;
return snd_soc_register_dai(dai);
}
EXPORT_SYMBOL_GPL(s3c_i2sv2_register_dai);
MODULE_LICENSE("GPL");
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