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

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/*
* Copyright (C) 2012 Samsung Electronics
* R. Chandrasekar <rcsekar@samsung.com>
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <asm/arch/clk.h>
#include <asm/arch/pinmux.h>
#include <asm/arch/i2s-regs.h>
#include <asm/io.h>
#include <common.h>
#include <sound.h>
#include <i2s.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 regiter 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 regiter 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 regiter 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 regiter address
* @param flush Tx fifo flush command (0x00 - do not flush
* 0x80 - flush tx fifo)
*/
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 regiter address
* @param dir Clock direction
*
* @return int value 0 for success, -1 in case of error
*/
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 regiter address
*
* @return int value 0 for success, -1 in case of error
*/
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 -1;
}
/*
* 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 -1;
}
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 -1;
}
break;
default:
debug("%s: Invalid master selection [0x%x]\n", __func__,
(fmt & SND_SOC_DAIFMT_MASTER_MASK));
return -1;
}
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 regiter address
*
* @return int value 0 for success, -1 in case of error
*/
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 -1;
}
writel(mod, &i2s_reg->mod);
return 0;
}
int i2s_transfer_tx_data(struct i2stx_info *pi2s_tx, unsigned int *data,
unsigned long data_size)
{
int i;
int start;
struct i2s_reg *i2s_reg =
(struct i2s_reg *)pi2s_tx->base_address;
if (data_size < FIFO_LENGTH) {
debug("%s : Invalid data size\n", __func__);
return -1; /* invalid pcm data size */
}
/* fill the tx buffer before stating the tx transmit */
for (i = 0; i < FIFO_LENGTH; i++)
writel(*data++, &i2s_reg->txd);
data_size -= 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(*data++, &i2s_reg->txd);
data_size--;
} else {
if (get_timer(start) > TIMEOUT_I2S_TX) {
i2s_txctrl(i2s_reg, I2S_TX_OFF);
debug("%s: I2S Transfer Timeout\n", __func__);
return -1;
}
}
}
i2s_txctrl(i2s_reg, I2S_TX_OFF);
return 0;
}
int i2s_tx_init(struct i2stx_info *pi2s_tx)
{
int ret;
struct i2s_reg *i2s_reg =
(struct i2s_reg *)pi2s_tx->base_address;
/* Initialize GPIO for I2s */
exynos_pinmux_config(PERIPH_ID_I2S1, 0);
/* Set EPLL Clock */
ret = set_epll_clk(pi2s_tx->audio_pll_clk);
if (ret != 0) {
debug("%s: epll clock set rate falied\n", __func__);
return -1;
}
/* Select Clk Source for Audio1 */
set_i2s_clk_source();
/* Set Prescaler to get MCLK */
set_i2s_clk_prescaler(pi2s_tx->audio_pll_clk,
(pi2s_tx->samplingrate * (pi2s_tx->rfs)));
/* 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 -1;
}
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;
}