[alsa-devel] [PATCH 15/17] ASoC: S3C2412 IIS driver
Mark Brown
broonie at opensource.wolfsonmicro.com
Thu Jan 10 14:17:13 CET 2008
From: Ben Dooks <ben at fluff.org.uk>
S3C2412 SoC IIS support for ALSA/ASoC
Signed-off-by: Ben Dooks <ben-linux at fluff.org>
Signed-off-by: Mark Brown <broonie at opensource.wolfsonmicro.com>
---
sound/soc/s3c24xx/Kconfig | 3 +
sound/soc/s3c24xx/Makefile | 2 +
sound/soc/s3c24xx/s3c2412-i2s.c | 682 +++++++++++++++++++++++++++++++++++++++
sound/soc/s3c24xx/s3c2412-i2s.h | 38 +++
4 files changed, 725 insertions(+), 0 deletions(-)
create mode 100644 sound/soc/s3c24xx/s3c2412-i2s.c
create mode 100644 sound/soc/s3c24xx/s3c2412-i2s.h
diff --git a/sound/soc/s3c24xx/Kconfig b/sound/soc/s3c24xx/Kconfig
index 5632a2e..3fdedbb 100644
--- a/sound/soc/s3c24xx/Kconfig
+++ b/sound/soc/s3c24xx/Kconfig
@@ -10,6 +10,9 @@ config SND_S3C24XX_SOC
config SND_S3C24XX_SOC_I2S
tristate
+config SND_S3C2412_SOC_I2S
+ tristate
+
config SND_S3C2443_SOC_AC97
tristate
select AC97_BUS
diff --git a/sound/soc/s3c24xx/Makefile b/sound/soc/s3c24xx/Makefile
index 13c92f0..063e642 100644
--- a/sound/soc/s3c24xx/Makefile
+++ b/sound/soc/s3c24xx/Makefile
@@ -1,11 +1,13 @@
# S3c24XX Platform Support
snd-soc-s3c24xx-objs := s3c24xx-pcm.o
snd-soc-s3c24xx-i2s-objs := s3c24xx-i2s.o
+snd-soc-s3c2412-i2s-objs := s3c2412-i2s.o
snd-soc-s3c2443-ac97-objs := s3c2443-ac97.o
obj-$(CONFIG_SND_S3C24XX_SOC) += snd-soc-s3c24xx.o
obj-$(CONFIG_SND_S3C24XX_SOC_I2S) += snd-soc-s3c24xx-i2s.o
obj-$(CONFIG_SND_S3C2443_SOC_AC97) += snd-soc-s3c2443-ac97.o
+obj-$(CONFIG_SND_S3C2412_SOC_I2S) += snd-soc-s3c2412-i2s.o
# S3C24XX Machine Support
snd-soc-neo1973-wm8753-objs := neo1973_wm8753.o
diff --git a/sound/soc/s3c24xx/s3c2412-i2s.c b/sound/soc/s3c24xx/s3c2412-i2s.c
new file mode 100644
index 0000000..11fee8b
--- /dev/null
+++ b/sound/soc/s3c24xx/s3c2412-i2s.c
@@ -0,0 +1,682 @@
+/* sound/soc/s3c24xx/s3c2412-i2s.c
+ *
+ * ALSA Soc Audio Layer - S3C2412 I2S driver
+ *
+ * Copyright (c) 2006 Wolfson Microelectronics PLC.
+ * Graeme Gregory graeme.gregory at wolfsonmicro.com
+ * linux at wolfsonmicro.com
+ *
+ * Copyright (c) 2007, 2004-2005 Simtec Electronics
+ * http://armlinux.simtec.co.uk/
+ * Ben Dooks <ben at 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 <sound/driver.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/initval.h>
+#include <sound/soc.h>
+#include <asm/hardware.h>
+
+#include <linux/io.h>
+#include <asm/dma.h>
+
+#include <asm/plat-s3c24xx/regs-s3c2412-iis.h>
+
+#include <asm/arch/regs-gpio.h>
+#include <asm/arch/audio.h>
+#include <asm/arch/dma.h>
+
+#include "s3c24xx-pcm.h"
+#include "s3c2412-i2s.h"
+
+#define S3C2412_I2S_DEBUG 0
+#define S3C2412_I2S_DEBUG_CON 0
+
+#if S3C2412_I2S_DEBUG
+#define DBG(x...) printk(KERN_INFO x)
+#else
+#define DBG(x...) do { } while (0)
+#endif
+
+static struct s3c2410_dma_client s3c2412_dma_client_out = {
+ .name = "I2S PCM Stereo out"
+};
+
+static struct s3c2410_dma_client s3c2412_dma_client_in = {
+ .name = "I2S PCM Stereo in"
+};
+
+static struct s3c24xx_pcm_dma_params s3c2412_i2s_pcm_stereo_out = {
+ .client = &s3c2412_dma_client_out,
+ .channel = DMACH_I2S_OUT,
+ .dma_addr = S3C2410_PA_IIS + S3C2412_IISTXD,
+ .dma_size = 4,
+};
+
+static struct s3c24xx_pcm_dma_params s3c2412_i2s_pcm_stereo_in = {
+ .client = &s3c2412_dma_client_in,
+ .channel = DMACH_I2S_IN,
+ .dma_addr = S3C2410_PA_IIS + S3C2412_IISRXD,
+ .dma_size = 4,
+};
+
+struct s3c2412_i2s_info {
+ struct device *dev;
+ void __iomem *regs;
+ struct clk *iis_clk;
+ struct clk *iis_pclk;
+ struct clk *iis_cclk;
+};
+
+static struct s3c2412_i2s_info s3c2412_i2s;
+
+#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(int on)
+{
+ struct s3c2412_i2s_info *i2s = &s3c2412_i2s;
+ void __iomem *regs = i2s->regs;
+ u32 fic, con, mod;
+
+ DBG("%s(%d)\n", __func__, on);
+
+ fic = readl(regs + S3C2412_IISFIC);
+ con = readl(regs + S3C2412_IISCON);
+ mod = readl(regs + S3C2412_IISMOD);
+
+ DBG("%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 in IISMOD\n");
+ }
+
+ 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 in IISMOD\n");
+ }
+
+ writel(mod, regs + S3C2412_IISMOD);
+ writel(con, regs + S3C2412_IISCON);
+ }
+
+ fic = readl(regs + S3C2412_IISFIC);
+ dbg_showcon(__func__, con);
+ DBG("%s: IIS: CON=%x MOD=%x FIC=%x\n", __func__, con, mod, fic);
+}
+
+static void s3c2412_snd_rxctrl(int on)
+{
+ struct s3c2412_i2s_info *i2s = &s3c2412_i2s;
+ void __iomem *regs = i2s->regs;
+ u32 fic, con, mod;
+
+ DBG("%s(%d)\n", __func__, on);
+
+ fic = readl(regs + S3C2412_IISFIC);
+ con = readl(regs + S3C2412_IISCON);
+ mod = readl(regs + S3C2412_IISMOD);
+
+ DBG("%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 in IISMOD\n");
+ }
+
+ 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, "RXEN: Invalid MODE in IISMOD\n");
+ }
+
+ writel(con, regs + S3C2412_IISCON);
+ writel(mod, regs + S3C2412_IISMOD);
+ }
+
+ fic = readl(regs + S3C2412_IISFIC);
+ DBG("%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(void)
+{
+ u32 iiscon;
+ unsigned long timeout = jiffies + msecs_to_jiffies(5);
+
+ DBG("Entered %s\n", __func__);
+
+ while (1) {
+ iiscon = readl(s3c2412_i2s.regs + S3C2412_IISCON);
+ if (iiscon & S3C2412_IISCON_LRINDEX)
+ break;
+
+ if (timeout < jiffies) {
+ printk(KERN_ERR "%s: timeout\n", __func__);
+ return -ETIMEDOUT;
+ }
+ }
+
+ return 0;
+}
+
+/*
+ * Check whether CPU is the master or slave
+ */
+static inline int s3c2412_snd_is_clkmaster(void)
+{
+ u32 iismod = readl(s3c2412_i2s.regs + S3C2412_IISMOD);
+
+ DBG("Entered %s\n", __func__);
+
+ iismod &= S3C2412_IISMOD_MASTER_MASK;
+ return !(iismod == S3C2412_IISMOD_SLAVE);
+}
+
+/*
+ * Set S3C2412 I2S DAI format
+ */
+static int s3c2412_i2s_set_fmt(struct snd_soc_cpu_dai *cpu_dai,
+ unsigned int fmt)
+{
+ u32 iismod;
+
+
+ DBG("Entered %s\n", __func__);
+
+ iismod = readl(s3c2412_i2s.regs + S3C2412_IISMOD);
+ DBG("hw_params r: IISMOD: %x \n", iismod);
+
+ switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
+ case SND_SOC_DAIFMT_CBM_CFM:
+ iismod &= ~S3C2412_IISMOD_MASTER_MASK;
+ iismod |= S3C2412_IISMOD_SLAVE;
+ break;
+ case SND_SOC_DAIFMT_CBS_CFS:
+ iismod &= ~S3C2412_IISMOD_MASTER_MASK;
+ iismod |= S3C2412_IISMOD_MASTER_INTERNAL;
+ break;
+ default:
+ DBG("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:
+ DBG("Unknown data format\n");
+ return -EINVAL;
+ }
+
+ writel(iismod, s3c2412_i2s.regs + S3C2412_IISMOD);
+ DBG("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_pcm_runtime *rtd = substream->private_data;
+ u32 iismod;
+
+ DBG("Entered %s\n", __func__);
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ rtd->dai->cpu_dai->dma_data = &s3c2412_i2s_pcm_stereo_out;
+ else
+ rtd->dai->cpu_dai->dma_data = &s3c2412_i2s_pcm_stereo_in;
+
+ /* Working copies of register */
+ iismod = readl(s3c2412_i2s.regs + S3C2412_IISMOD);
+ DBG("%s: r: IISMOD: %x\n", __func__, iismod);
+
+ 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;
+ }
+
+ writel(iismod, s3c2412_i2s.regs + S3C2412_IISMOD);
+ DBG("%s: w: IISMOD: %x\n", __func__, iismod);
+ return 0;
+}
+
+static int s3c2412_i2s_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+ int capture = (substream->stream == SNDRV_PCM_STREAM_CAPTURE);
+ unsigned long irqs;
+ int ret = 0;
+
+ DBG("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,
+ s3c2412_i2s.regs + S3C2412_IISFIC);
+
+ /* clear again, just in case */
+ writel(0x0, s3c2412_i2s.regs + S3C2412_IISFIC);
+
+ case SNDRV_PCM_TRIGGER_RESUME:
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ if (!s3c2412_snd_is_clkmaster()) {
+ ret = s3c2412_snd_lrsync();
+ if (ret)
+ goto exit_err;
+ }
+
+ local_irq_save(irqs);
+
+ if (capture)
+ s3c2412_snd_rxctrl(1);
+ else
+ s3c2412_snd_txctrl(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(0);
+ else
+ s3c2412_snd_txctrl(0);
+
+ local_irq_restore(irqs);
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+exit_err:
+ return ret;
+}
+
+/* default table of all avaialable root fs divisors */
+static unsigned int s3c2412_iis_fs[] = { 256, 512, 384, 768, 0 };
+
+int s3c2412_iis_calc_rate(struct s3c2412_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;
+
+
+ if (fstab == NULL)
+ fstab = s3c2412_iis_fs;
+
+ for (fs = 0;; fs++) {
+ fsdiv = s3c2412_iis_fs[fs];
+
+ if (fsdiv == 0)
+ break;
+
+ 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 "%dfs: div %d => result %d, 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=%d, div=%d, rate=%d\n",
+ best_fs, best_div, best_rate);
+
+ info->fs_div = best_fs;
+ info->clk_div = best_div;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(s3c2412_iis_calc_rate);
+
+/*
+ * Set S3C2412 Clock source
+ */
+static int s3c2412_i2s_set_sysclk(struct snd_soc_cpu_dai *cpu_dai,
+ int clk_id, unsigned int freq, int dir)
+{
+ u32 iismod = readl(s3c2412_i2s.regs + S3C2412_IISMOD);
+
+ DBG("%s(%p, %d, %u, %d)\n", __func__, cpu_dai, clk_id,
+ freq, dir);
+
+ switch (clk_id) {
+ case S3C2412_CLKSRC_PCLK:
+ iismod &= ~S3C2412_IISMOD_MASTER_MASK;
+ iismod |= S3C2412_IISMOD_MASTER_INTERNAL;
+ break;
+ case S3C2412_CLKSRC_I2SCLK:
+ iismod &= ~S3C2412_IISMOD_MASTER_MASK;
+ iismod |= S3C2412_IISMOD_MASTER_EXTERNAL;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ writel(iismod, s3c2412_i2s.regs + S3C2412_IISMOD);
+ return 0;
+}
+
+/*
+ * Set S3C2412 Clock dividers
+ */
+static int s3c2412_i2s_set_clkdiv(struct snd_soc_cpu_dai *cpu_dai,
+ int div_id, int div)
+{
+ struct s3c2412_i2s_info *i2s = &s3c2412_i2s;
+ u32 reg;
+
+ DBG("%s(%p, %d, %d)\n", __func__, cpu_dai, div_id, div);
+
+ switch (div_id) {
+ case S3C2412_DIV_BCLK:
+ reg = readl(i2s->regs + S3C2412_IISMOD);
+ reg &= ~S3C2412_IISMOD_BCLK_MASK;
+ writel(reg | div, i2s->regs + S3C2412_IISMOD);
+
+ DBG("%s: MOD=%08x\n", __func__, readl(i2s->regs + S3C2412_IISMOD));
+ break;
+
+ case S3C2412_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(s3c2412_i2s.regs + S3C2412_IISMOD);
+ reg &= ~S3C2412_IISMOD_RCLK_MASK;
+ writel(reg | div, i2s->regs + S3C2412_IISMOD);
+ DBG("%s: MOD=%08x\n", __func__, readl(i2s->regs + S3C2412_IISMOD));
+ break;
+
+ case S3C2412_DIV_PRESCALER:
+ if (div >= 0) {
+ writel((div << 8) | S3C2412_IISPSR_PSREN,
+ i2s->regs + S3C2412_IISPSR);
+ } else {
+ writel(0x0, i2s->regs + S3C2412_IISPSR);
+ }
+ DBG("%s: PSR=%08x\n", __func__, readl(i2s->regs + S3C2412_IISPSR));
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+struct clk *s3c2412_get_iisclk(void)
+{
+ return s3c2412_i2s.iis_clk;
+}
+EXPORT_SYMBOL_GPL(s3c2412_get_iisclk);
+
+
+static int s3c2412_i2s_probe(struct platform_device *pdev)
+{
+ DBG("Entered %s\n", __func__);
+
+ s3c2412_i2s.dev = &pdev->dev;
+
+ s3c2412_i2s.regs = ioremap(S3C2410_PA_IIS, 0x100);
+ if (s3c2412_i2s.regs == NULL)
+ return -ENXIO;
+
+ s3c2412_i2s.iis_pclk = clk_get(&pdev->dev, "iis");
+ if (s3c2412_i2s.iis_pclk == NULL) {
+ DBG("failed to get iis_clock\n");
+ iounmap(s3c2412_i2s.regs);
+ return -ENODEV;
+ }
+
+ s3c2412_i2s.iis_cclk = clk_get(&pdev->dev, "i2sclk");
+ if (s3c2412_i2s.iis_cclk == NULL) {
+ DBG("failed to get i2sclk clock\n");
+ iounmap(s3c2412_i2s.regs);
+ return -ENODEV;
+ }
+
+ clk_set_parent(s3c2412_i2s.iis_cclk, clk_get(NULL, "mpll"));
+
+ clk_enable(s3c2412_i2s.iis_pclk);
+ clk_enable(s3c2412_i2s.iis_cclk);
+
+ s3c2412_i2s.iis_clk = s3c2412_i2s.iis_pclk;
+
+ /* Configure the I2S pins in correct mode */
+ s3c2410_gpio_cfgpin(S3C2410_GPE0, S3C2410_GPE0_I2SLRCK);
+ s3c2410_gpio_cfgpin(S3C2410_GPE1, S3C2410_GPE1_I2SSCLK);
+ s3c2410_gpio_cfgpin(S3C2410_GPE2, S3C2410_GPE2_CDCLK);
+ s3c2410_gpio_cfgpin(S3C2410_GPE3, S3C2410_GPE3_I2SSDI);
+ s3c2410_gpio_cfgpin(S3C2410_GPE4, S3C2410_GPE4_I2SSDO);
+
+ s3c2412_snd_txctrl(0);
+ s3c2412_snd_rxctrl(0);
+
+ return 0;
+}
+
+#define S3C2412_I2S_RATES \
+ (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \
+ SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
+ SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
+
+struct snd_soc_cpu_dai s3c2412_i2s_dai = {
+ .name = "s3c2412-i2s",
+ .id = 0,
+ .type = SND_SOC_DAI_I2S,
+ .probe = s3c2412_i2s_probe,
+ .playback = {
+ .channels_min = 2,
+ .channels_max = 2,
+ .rates = S3C2412_I2S_RATES,
+ .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
+ },
+ .capture = {
+ .channels_min = 2,
+ .channels_max = 2,
+ .rates = S3C2412_I2S_RATES,
+ .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,
+ },
+ .ops = {
+ .trigger = s3c2412_i2s_trigger,
+ .hw_params = s3c2412_i2s_hw_params,
+ },
+ .dai_ops = {
+ .set_fmt = s3c2412_i2s_set_fmt,
+ .set_clkdiv = s3c2412_i2s_set_clkdiv,
+ .set_sysclk = s3c2412_i2s_set_sysclk,
+ },
+};
+EXPORT_SYMBOL_GPL(s3c2412_i2s_dai);
+
+/* Module information */
+MODULE_AUTHOR("Ben Dooks, <ben at simtec.co.uk>");
+MODULE_DESCRIPTION("S3C2412 I2S SoC Interface");
+MODULE_LICENSE("GPL");
diff --git a/sound/soc/s3c24xx/s3c2412-i2s.h b/sound/soc/s3c24xx/s3c2412-i2s.h
new file mode 100644
index 0000000..27f48e1
--- /dev/null
+++ b/sound/soc/s3c24xx/s3c2412-i2s.h
@@ -0,0 +1,38 @@
+/* sound/soc/s3c24xx/s3c2412-i2s.c
+ *
+ * ALSA Soc Audio Layer - S3C2412 I2S driver
+ *
+ * Copyright (c) 2007 Simtec Electronics
+ * http://armlinux.simtec.co.uk/
+ * Ben Dooks <ben at 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.
+*/
+
+#ifndef __SND_SOC_S3C24XX_S3C2412_I2S_H
+#define __SND_SOC_S3C24XX_S3C2412_I2S_H __FILE__
+
+#define S3C2412_DIV_BCLK (1)
+#define S3C2412_DIV_RCLK (2)
+#define S3C2412_DIV_PRESCALER (3)
+
+#define S3C2412_CLKSRC_PCLK (0)
+#define S3C2412_CLKSRC_I2SCLK (1)
+
+extern struct clk *s3c2412_get_iisclk(void);
+
+extern struct snd_soc_cpu_dai s3c2412_i2s_dai;
+
+struct s3c2412_rate_calc {
+ unsigned int clk_div; /* for prescaler */
+ unsigned int fs_div; /* for root frame clock */
+};
+
+extern int s3c2412_iis_calc_rate(struct s3c2412_rate_calc *info,
+ unsigned int *fstab,
+ unsigned int rate, struct clk *clk);
+
+#endif /* __SND_SOC_S3C24XX_S3C2412_I2S_H */
--
1.5.3.8
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