u-boot/drivers/sound/samsung-i2s.c

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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2012 Samsung Electronics
* R. Chandrasekar <rcsekar@samsung.com>
*/
#include <common.h>
#include <dm.h>
#include <i2s.h>
#include <sound.h>
#include <asm/arch/clk.h>
#include <asm/arch/pinmux.h>
#include <asm/arch/i2s-regs.h>
#include <asm/io.h>
#define FIC_TX2COUNT(x) (((x) >> 24) & 0xf)
#define FIC_TX1COUNT(x) (((x) >> 16) & 0xf)
#define FIC_TXCOUNT(x) (((x) >> 8) & 0xf)
#define FIC_RXCOUNT(x) (((x) >> 0) & 0xf)
#define FICS_TXCOUNT(x) (((x) >> 8) & 0x7f)
#define TIMEOUT_I2S_TX 100 /* i2s transfer timeout */
/*
* Sets the frame size for I2S LR clock
*
* @param i2s_reg i2s register address
* @param rfs Frame Size
*/
static void i2s_set_lr_framesize(struct i2s_reg *i2s_reg, unsigned int rfs)
{
unsigned int mod = readl(&i2s_reg->mod);
mod &= ~MOD_RCLK_MASK;
switch (rfs) {
case 768:
mod |= MOD_RCLK_768FS;
break;
case 512:
mod |= MOD_RCLK_512FS;
break;
case 384:
mod |= MOD_RCLK_384FS;
break;
default:
mod |= MOD_RCLK_256FS;
break;
}
writel(mod, &i2s_reg->mod);
}
/*
* Sets the i2s transfer control
*
* @param i2s_reg i2s register address
* @param on 1 enable tx , 0 disable tx transfer
*/
static void i2s_txctrl(struct i2s_reg *i2s_reg, int on)
{
unsigned int con = readl(&i2s_reg->con);
unsigned int mod = readl(&i2s_reg->mod) & ~MOD_MASK;
if (on) {
con |= CON_ACTIVE;
con &= ~CON_TXCH_PAUSE;
} else {
con |= CON_TXCH_PAUSE;
con &= ~CON_ACTIVE;
}
writel(mod, &i2s_reg->mod);
writel(con, &i2s_reg->con);
}
/*
* set the bit clock frame size (in multiples of LRCLK)
*
* @param i2s_reg i2s register address
* @param bfs bit Frame Size
*/
static void i2s_set_bitclk_framesize(struct i2s_reg *i2s_reg, unsigned bfs)
{
unsigned int mod = readl(&i2s_reg->mod);
mod &= ~MOD_BCLK_MASK;
switch (bfs) {
case 48:
mod |= MOD_BCLK_48FS;
break;
case 32:
mod |= MOD_BCLK_32FS;
break;
case 24:
mod |= MOD_BCLK_24FS;
break;
case 16:
mod |= MOD_BCLK_16FS;
break;
default:
return;
}
writel(mod, &i2s_reg->mod);
}
/*
* flushes the i2stx fifo
*
* @param i2s_reg i2s register address
* @param flush Tx fifo flush command (0x00 - do not flush
* 0x80 - flush tx fifo)
*/
static void i2s_fifo(struct i2s_reg *i2s_reg, unsigned int flush)
{
/* Flush the FIFO */
setbits_le32(&i2s_reg->fic, flush);
clrbits_le32(&i2s_reg->fic, flush);
}
/*
* Set System Clock direction
*
* @param i2s_reg i2s register address
* @param dir Clock direction
*
* @return int value 0 for success, -1 in case of error
*/
static int i2s_set_sysclk_dir(struct i2s_reg *i2s_reg, int dir)
{
unsigned int mod = readl(&i2s_reg->mod);
if (dir == SND_SOC_CLOCK_IN)
mod |= MOD_CDCLKCON;
else
mod &= ~MOD_CDCLKCON;
writel(mod, &i2s_reg->mod);
return 0;
}
/*
* Sets I2S Clcok format
*
* @param fmt i2s clock properties
* @param i2s_reg i2s register address
*
* @return int value 0 for success, -1 in case of error
*/
static int i2s_set_fmt(struct i2s_reg *i2s_reg, unsigned int fmt)
{
unsigned int mod = readl(&i2s_reg->mod);
unsigned int tmp = 0;
unsigned int ret = 0;
/* Format is priority */
switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
case SND_SOC_DAIFMT_RIGHT_J:
tmp |= MOD_LR_RLOW;
tmp |= MOD_SDF_MSB;
break;
case SND_SOC_DAIFMT_LEFT_J:
tmp |= MOD_LR_RLOW;
tmp |= MOD_SDF_LSB;
break;
case SND_SOC_DAIFMT_I2S:
tmp |= MOD_SDF_IIS;
break;
default:
debug("%s: Invalid format priority [0x%x]\n", __func__,
(fmt & SND_SOC_DAIFMT_FORMAT_MASK));
return -ERANGE;
}
/*
* INV flag is relative to the FORMAT flag - if set it simply
* flips the polarity specified by the Standard
*/
switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
case SND_SOC_DAIFMT_NB_NF:
break;
case SND_SOC_DAIFMT_NB_IF:
if (tmp & MOD_LR_RLOW)
tmp &= ~MOD_LR_RLOW;
else
tmp |= MOD_LR_RLOW;
break;
default:
debug("%s: Invalid clock ploarity input [0x%x]\n", __func__,
(fmt & SND_SOC_DAIFMT_INV_MASK));
return -ERANGE;
}
switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
case SND_SOC_DAIFMT_CBS_CFS:
tmp |= MOD_SLAVE;
break;
case SND_SOC_DAIFMT_CBM_CFM:
/* Set default source clock in Master mode */
ret = i2s_set_sysclk_dir(i2s_reg, SND_SOC_CLOCK_OUT);
if (ret != 0) {
debug("%s:set i2s clock direction failed\n", __func__);
return ret;
}
break;
default:
debug("%s: Invalid master selection [0x%x]\n", __func__,
(fmt & SND_SOC_DAIFMT_MASTER_MASK));
return -ERANGE;
}
mod &= ~(MOD_SDF_MASK | MOD_LR_RLOW | MOD_SLAVE);
mod |= tmp;
writel(mod, &i2s_reg->mod);
return 0;
}
/*
* Sets the sample width in bits
*
* @param blc samplewidth (size of sample in bits)
* @param i2s_reg i2s register address
*
* @return int value 0 for success, -1 in case of error
*/
static int i2s_set_samplesize(struct i2s_reg *i2s_reg, unsigned int blc)
{
unsigned int mod = readl(&i2s_reg->mod);
mod &= ~MOD_BLCP_MASK;
mod &= ~MOD_BLC_MASK;
switch (blc) {
case 8:
mod |= MOD_BLCP_8BIT;
mod |= MOD_BLC_8BIT;
break;
case 16:
mod |= MOD_BLCP_16BIT;
mod |= MOD_BLC_16BIT;
break;
case 24:
mod |= MOD_BLCP_24BIT;
mod |= MOD_BLC_24BIT;
break;
default:
debug("%s: Invalid sample size input [0x%x]\n",
__func__, blc);
return -ERANGE;
}
writel(mod, &i2s_reg->mod);
return 0;
}
int i2s_transfer_tx_data(struct i2s_uc_priv *pi2s_tx, void *data,
uint data_size)
{
struct i2s_reg *i2s_reg = (struct i2s_reg *)pi2s_tx->base_address;
u32 *ptr;
int i;
int start;
if (data_size < FIFO_LENGTH) {
debug("%s : Invalid data size\n", __func__);
return -ENODATA; /* invalid pcm data size */
}
/* fill the tx buffer before stating the tx transmit */
for (i = 0, ptr = data; i < FIFO_LENGTH; i++)
writel(*ptr++, &i2s_reg->txd);
data_size -= sizeof(*ptr) * FIFO_LENGTH;
i2s_txctrl(i2s_reg, I2S_TX_ON);
while (data_size > 0) {
start = get_timer(0);
if (!(CON_TXFIFO_FULL & (readl(&i2s_reg->con)))) {
writel(*ptr++, &i2s_reg->txd);
data_size -= sizeof(*ptr);
} else {
if (get_timer(start) > TIMEOUT_I2S_TX) {
i2s_txctrl(i2s_reg, I2S_TX_OFF);
debug("%s: I2S Transfer Timeout\n", __func__);
return -ETIMEDOUT;
}
}
}
i2s_txctrl(i2s_reg, I2S_TX_OFF);
return 0;
}
static int i2s_tx_init(struct i2s_uc_priv *pi2s_tx)
{
int ret;
struct i2s_reg *i2s_reg = (struct i2s_reg *)pi2s_tx->base_address;
if (pi2s_tx->id == 0) {
/* Initialize GPIO for I2S-0 */
exynos_pinmux_config(PERIPH_ID_I2S0, 0);
/* Set EPLL Clock */
ret = set_epll_clk(pi2s_tx->samplingrate * pi2s_tx->rfs * 4);
} else if (pi2s_tx->id == 1) {
/* Initialize GPIO for I2S-1 */
exynos_pinmux_config(PERIPH_ID_I2S1, 0);
/* Set EPLL Clock */
ret = set_epll_clk(pi2s_tx->audio_pll_clk);
} else {
debug("%s: unsupported i2s-%d bus\n", __func__, pi2s_tx->id);
return -ERANGE;
}
if (ret) {
debug("%s: epll clock set rate failed\n", __func__);
return ret;
}
/* Select Clk Source for Audio 0 or 1 */
ret = set_i2s_clk_source(pi2s_tx->id);
if (ret) {
debug("%s: unsupported clock for i2s-%d\n", __func__,
pi2s_tx->id);
return ret;
}
if (pi2s_tx->id == 0) {
/*Reset the i2s module */
writel(CON_RESET, &i2s_reg->con);
writel(MOD_OP_CLK | MOD_RCLKSRC, &i2s_reg->mod);
/* set i2s prescaler */
writel(PSREN | PSVAL, &i2s_reg->psr);
} else {
/* Set Prescaler to get MCLK */
ret = set_i2s_clk_prescaler(pi2s_tx->audio_pll_clk,
(pi2s_tx->samplingrate * (pi2s_tx->rfs)),
pi2s_tx->id);
}
if (ret) {
debug("%s: unsupported prescalar for i2s-%d\n", __func__,
pi2s_tx->id);
return ret;
}
/* Configure I2s format */
ret = i2s_set_fmt(i2s_reg, SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
SND_SOC_DAIFMT_CBM_CFM);
if (ret == 0) {
i2s_set_lr_framesize(i2s_reg, pi2s_tx->rfs);
ret = i2s_set_samplesize(i2s_reg, pi2s_tx->bitspersample);
if (ret != 0) {
debug("%s:set sample rate failed\n", __func__);
return ret;
}
i2s_set_bitclk_framesize(i2s_reg, pi2s_tx->bfs);
/* disable i2s transfer flag and flush the fifo */
i2s_txctrl(i2s_reg, I2S_TX_OFF);
i2s_fifo(i2s_reg, FIC_TXFLUSH);
} else {
debug("%s: failed\n", __func__);
}
return ret;
}
static int samsung_i2s_tx_data(struct udevice *dev, void *data, uint data_size)
{
struct i2s_uc_priv *priv = dev_get_uclass_priv(dev);
return i2s_transfer_tx_data(priv, data, data_size);
}
static int samsung_i2s_probe(struct udevice *dev)
{
struct i2s_uc_priv *priv = dev_get_uclass_priv(dev);
return i2s_tx_init(priv);
}
static int samsung_i2s_ofdata_to_platdata(struct udevice *dev)
{
struct i2s_uc_priv *priv = dev_get_uclass_priv(dev);
ulong base;
/*
* Get the pre-defined sound specific values from FDT.
* All of these are expected to be correct otherwise
* wrong register values in i2s setup parameters
* may result in no sound play.
*/
base = dev_read_addr(dev);
if (base == FDT_ADDR_T_NONE) {
debug("%s: Missing i2s base\n", __func__);
return -EINVAL;
}
priv->base_address = base;
if (dev_read_u32u(dev, "samsung,i2s-epll-clock-frequency",
&priv->audio_pll_clk))
goto err;
debug("audio_pll_clk = %d\n", priv->audio_pll_clk);
if (dev_read_u32u(dev, "samsung,i2s-sampling-rate",
&priv->samplingrate))
goto err;
debug("samplingrate = %d\n", priv->samplingrate);
if (dev_read_u32u(dev, "samsung,i2s-bits-per-sample",
&priv->bitspersample))
goto err;
debug("bitspersample = %d\n", priv->bitspersample);
if (dev_read_u32u(dev, "samsung,i2s-channels", &priv->channels))
goto err;
debug("channels = %d\n", priv->channels);
if (dev_read_u32u(dev, "samsung,i2s-lr-clk-framesize", &priv->rfs))
goto err;
debug("rfs = %d\n", priv->rfs);
if (dev_read_u32u(dev, "samsung,i2s-bit-clk-framesize", &priv->bfs))
goto err;
debug("bfs = %d\n", priv->bfs);
if (dev_read_u32u(dev, "samsung,i2s-id", &priv->id))
goto err;
debug("id = %d\n", priv->id);
return 0;
err:
debug("fail to get sound i2s node properties\n");
return -EINVAL;
}
static const struct i2s_ops samsung_i2s_ops = {
.tx_data = samsung_i2s_tx_data,
};
static const struct udevice_id samsung_i2s_ids[] = {
{ .compatible = "samsung,s5pv210-i2s" },
{ }
};
U_BOOT_DRIVER(samsung_i2s) = {
.name = "samsung_i2s",
.id = UCLASS_I2S,
.of_match = samsung_i2s_ids,
.probe = samsung_i2s_probe,
.ofdata_to_platdata = samsung_i2s_ofdata_to_platdata,
.ops = &samsung_i2s_ops,
};