[1/9,V3] SOUND: SAMSUNG: Add I2S driver

Message ID 1350975449-27816-2-git-send-email-rajeshwari.s@samsung.com
State New
Headers show

Commit Message

Rajeshwari Shinde Oct. 23, 2012, 6:57 a.m.
This patch adds driver for I2S interface specific to samsung.

Signed-off-by: R. Chandrasekar <rcsekar@samsung.com>
Signed-off-by: Rajeshwari Shinde <rajeshwari.s@samsung.com>
---
Changes in V2:
- renamed i2s.c to samsung-i2s.c.
Changes in V3:
- wave sine table removed and the same in calculated in a function.
 Makefile                    |    1 +
 drivers/sound/Makefile      |   47 ++++++
 drivers/sound/samsung-i2s.c |  358 +++++++++++++++++++++++++++++++++++++++++++
 drivers/sound/sound.c       |  228 +++++++++++++++++++++++++++
 include/i2s.h               |  127 +++++++++++++++
 include/sound.h             |   62 ++++++++
 6 files changed, 823 insertions(+), 0 deletions(-)
 create mode 100644 drivers/sound/Makefile
 create mode 100644 drivers/sound/samsung-i2s.c
 create mode 100644 drivers/sound/sound.c
 create mode 100644 include/i2s.h
 create mode 100644 include/sound.h

Comments

Simon Glass Oct. 25, 2012, 5:02 p.m. | #1
Hi,

On Mon, Oct 22, 2012 at 11:57 PM, Rajeshwari Shinde
<rajeshwari.s@samsung.com> wrote:
> This patch adds driver for I2S interface specific to samsung.
>
> Signed-off-by: R. Chandrasekar <rcsekar@samsung.com>
> Signed-off-by: Rajeshwari Shinde <rajeshwari.s@samsung.com>
> ---
> Changes in V2:
> - renamed i2s.c to samsung-i2s.c.
> Changes in V3:
> - wave sine table removed and the same in calculated in a function.

This looks great. There are a few style nits that you might want to
correct, but:

Acked-by: Simon Glass <sjg@chromium.org>

>  Makefile                    |    1 +
>  drivers/sound/Makefile      |   47 ++++++
>  drivers/sound/samsung-i2s.c |  358 +++++++++++++++++++++++++++++++++++++++++++
>  drivers/sound/sound.c       |  228 +++++++++++++++++++++++++++
>  include/i2s.h               |  127 +++++++++++++++
>  include/sound.h             |   62 ++++++++
>  6 files changed, 823 insertions(+), 0 deletions(-)
>  create mode 100644 drivers/sound/Makefile
>  create mode 100644 drivers/sound/samsung-i2s.c
>  create mode 100644 drivers/sound/sound.c
>  create mode 100644 include/i2s.h
>  create mode 100644 include/sound.h
>
> diff --git a/Makefile b/Makefile
> index a40d4cc..f7d7f47 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -293,6 +293,7 @@ LIBS-y += arch/powerpc/cpu/mpc8xxx/lib8xxx.o
>  endif
>  LIBS-y += drivers/rtc/librtc.o
>  LIBS-y += drivers/serial/libserial.o
> +LIBS-y += drivers/sound/libsound.o
>  LIBS-$(CONFIG_GENERIC_LPC_TPM) += drivers/tpm/libtpm.o
>  LIBS-y += drivers/twserial/libtws.o
>  LIBS-y += drivers/usb/eth/libusb_eth.o
> diff --git a/drivers/sound/Makefile b/drivers/sound/Makefile
> new file mode 100644
> index 0000000..18ad2c9
> --- /dev/null
> +++ b/drivers/sound/Makefile
> @@ -0,0 +1,47 @@
> +#
> +# 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 $(TOPDIR)/config.mk
> +
> +LIB    := $(obj)libsound.o
> +
> +COBJS-$(CONFIG_SOUND)  += sound.o
> +COBJS-$(CONFIG_I2S)    += samsung-i2s.o
> +
> +COBJS  := $(COBJS-y)
> +SRCS   := $(COBJS:.o=.c)
> +OBJS   := $(addprefix $(obj),$(COBJS))
> +
> +all:   $(LIB)
> +
> +$(LIB):        $(obj).depend $(OBJS)
> +       $(call cmd_link_o_target, $(OBJS))
> +
> +#########################################################################
> +
> +# defines $(obj).depend target
> +include $(SRCTREE)/rules.mk
> +
> +sinclude $(obj).depend
> +
> +#
> diff --git a/drivers/sound/samsung-i2s.c b/drivers/sound/samsung-i2s.c
> new file mode 100644
> index 0000000..3ce0b59
> --- /dev/null
> +++ b/drivers/sound/samsung-i2s.c
> @@ -0,0 +1,358 @@
> +/*
> + * 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;
> +
remove blank line

> +       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__);

{} around this else

> +
> +       return ret;
> +}
> diff --git a/drivers/sound/sound.c b/drivers/sound/sound.c
> new file mode 100644
> index 0000000..ff76996
> --- /dev/null
> +++ b/drivers/sound/sound.c
> @@ -0,0 +1,228 @@
> +/*
> + * 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 <malloc.h>
> +#include <common.h>
> +#include <asm/io.h>
> +#include <i2c.h>
> +#include <i2s.h>
> +#include <sound.h>
> +#include "wm8994.h"
> +#include <asm/arch/sound.h>
> +
> +/* defines */
> +#define SOUND_400_HZ 400
> +#define SOUND_BITS_IN_BYTE 8
> +
> +/* Globals */
> +struct i2stx_info g_i2stx_pri;
> +struct sound_codec_info g_codec_info;

Can these be static? Also comments are nice.

> +
> +/*
> + * get_sound_fdt_values gets fdt values for i2s parameters
> + *
> + * @param i2stx_info   i2s transmitter transfer param structure
> + * @param blob         FDT blob
> + */
> +static void get_sound_i2s_values(struct i2stx_info *i2s)
> +{
> +       i2s->base_address = samsung_get_base_i2s();
> +       i2s->audio_pll_clk = I2S_PLL_CLK;
> +       i2s->samplingrate = I2S_SAMPLING_RATE;
> +       i2s->bitspersample = I2S_BITS_PER_SAMPLE;
> +       i2s->channels = I2S_CHANNELS;
> +       i2s->rfs = I2S_RFS;
> +       i2s->bfs = I2S_BFS;
> +}
> +
> +/*
> + * Gets fdt values for wm8994 config parameters
> + *
> + * @param pcodec_info  codec information structure
> + * @param blob         FDT blob
> + * @return             int value, 0 for success
> + */
> +static int get_sound_wm8994_values(struct sound_codec_info *pcodec_info)
> +{
> +       int error = 0;
> +
> +       switch (AUDIO_COMPAT) {
> +       case AUDIO_COMPAT_SPI:
> +               debug("%s: Support not added for SPI interface\n", __func__);
> +               return -1;
> +               break;
> +       case AUDIO_COMPAT_I2C:
> +               pcodec_info->i2c_bus = AUDIO_I2C_BUS;
> +               pcodec_info->i2c_dev_addr = AUDIO_I2C_REG;
> +               debug("i2c dev addr = %d\n", pcodec_info->i2c_dev_addr);
> +               break;
> +       default:
> +               debug("%s: Unknown compat id %d\n", __func__, AUDIO_COMPAT);
> +               return -1;
> +       }
> +
> +       if (error == -1) {
> +               debug("fail to get wm8994 codec node properties\n");
> +               return -1;
> +       }
> +
> +       return 0;
> +}
> +
> +/*
> + * Gets fdt values for codec config parameters
> + *
> + * @param pcodec_info  codec information structure
> + * @param blob         FDT blob
> + * @return             int value, 0 for success
> + */
> +static int get_sound_codec_values(struct sound_codec_info *pcodec_info)
> +{
> +       int error = 0;
> +       const char *codectype;
> +
> +       codectype =  AUDIO_CODEC;
> +
> +       if (!strcmp(codectype, "wm8994")) {
> +               pcodec_info->codec_type = CODEC_WM_8994;
> +               error = get_sound_wm8994_values(pcodec_info);
> +       } else
> +               error = -1;

{} around this else

> +
> +       if (error == -1) {
> +               debug("fail to get sound codec node properties\n");
> +               return -1;
> +       }
> +
> +       return 0;
> +}
> +
> +int sound_init(void)
> +{
> +       int ret;
> +       struct i2stx_info *pi2s_tx = &g_i2stx_pri;
> +       struct sound_codec_info *pcodec_info = &g_codec_info;
> +
> +       /* Get the I2S Values */
> +       get_sound_i2s_values(pi2s_tx);
> +
> +       /* Get the codec Values */
> +       if (get_sound_codec_values(pcodec_info) < 0)
> +               return -1;
> +
> +       ret = i2s_tx_init(pi2s_tx);
> +       if (ret) {
> +               debug("%s: Failed to init i2c transmit: ret=%d\n", __func__,
> +                     ret);
> +               return ret;
> +       }
> +
> +       /* Check the codec type and initialise the same */
> +       if (pcodec_info->codec_type == CODEC_WM_8994) {
> +               ret = wm8994_init(pcodec_info, WM8994_AIF2,
> +                       pi2s_tx->samplingrate,
> +                       (pi2s_tx->samplingrate * (pi2s_tx->rfs)),
> +                       pi2s_tx->bitspersample, pi2s_tx->channels);
> +       } else {
> +               debug("%s: Unknown code type %d\n", __func__,
> +                     pcodec_info->codec_type);
> +               return -1;
> +       }
> +       if (ret) {
> +               debug("%s: Codec init failed\n", __func__);
> +               return -1;
> +       }
> +
> +       return ret;
> +}
> +
> +/*
> + * Generates square wave sound data for 1 second
> + *
> + * @param data          data buffer pointer
> + * @param size          size of the buffer
> + * @param freq          frequency of the wave
> + */
> +static void sound_prepare_buffer(unsigned short *data, int size, uint32_t freq)
> +{
> +       const int sample = 48000;
> +       const unsigned short amplitude = 16000; /* between 1 and 32767 */
> +       const int period = freq ? sample / freq : 0;
> +       const int half = period / 2;
> +
> +       assert(freq);
> +
> +       /* Make sure we don't overflow our buffer */
> +       if (size % 2)
> +               size--;
> +
> +       while (size) {
> +               int i;
> +               for (i = 0; size && i < half; i++) {
> +                       size -= 2;
> +                       *data++ = amplitude;
> +                       *data++ = amplitude;
> +               }
> +               for (i = 0; size && i < period - half; i++) {
> +                       size -= 2;
> +                       *data++ = -amplitude;
> +                       *data++ = -amplitude;
> +               }
> +       }
> +}
> +
> +int sound_play(uint32_t msec, uint32_t frequency)
> +{
> +       unsigned int *data;
> +       unsigned long data_size;
> +       unsigned int ret = 0;
> +
> +       /* Sine wave Buffer length computation */

Not a sine wave anymore - maybe just s/Sine wave //

> +       data_size = g_i2stx_pri.samplingrate * g_i2stx_pri.channels;
> +       data_size *= (g_i2stx_pri.bitspersample / SOUND_BITS_IN_BYTE);
> +       data = malloc(data_size);
> +
> +       if (data == NULL) {
> +               debug("%s: malloc failed\n", __func__);
> +               return -1;
> +       }
> +
> +       sound_prepare_buffer((unsigned short *)data,
> +                               data_size / sizeof(unsigned short), frequency);
> +
> +       while (msec >= 1000) {
> +               ret = i2s_transfer_tx_data(&g_i2stx_pri, data,
> +                                          (data_size / sizeof(int)));
> +               msec -= 1000;
> +       }
> +       if (msec) {
> +               unsigned long size =
> +                       (data_size * msec) / (sizeof(int) * 1000);
> +
> +               ret = i2s_transfer_tx_data(&g_i2stx_pri, data, size);
> +       }
> +
> +       free(data);
> +
> +       return ret;
> +}
> diff --git a/include/i2s.h b/include/i2s.h
> new file mode 100644
> index 0000000..f1b642e
> --- /dev/null
> +++ b/include/i2s.h
> @@ -0,0 +1,127 @@
> +/*
> + * 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
> + */
> +
> +#ifndef __I2S_H__
> +#define __I2S_H__
> +
> +/*
> + * DAI hardware audio formats.
> + *
> + * Describes the physical PCM data formating and clocking. Add new formats
> + * to the end.
> + */
> +#define SND_SOC_DAIFMT_I2S             1 /* I2S mode */
> +#define SND_SOC_DAIFMT_RIGHT_J         2 /* Right Justified mode */
> +#define SND_SOC_DAIFMT_LEFT_J          3 /* Left Justified mode */
> +#define SND_SOC_DAIFMT_DSP_A           4 /* L data MSB after FRM LRC */
> +#define SND_SOC_DAIFMT_DSP_B           5 /* L data MSB during FRM LRC */
> +#define SND_SOC_DAIFMT_AC97            6 /* AC97 */
> +#define SND_SOC_DAIFMT_PDM             7 /* Pulse density modulation */
> +
> +/* left and right justified also known as MSB and LSB respectively */
> +#define SND_SOC_DAIFMT_MSB             SND_SOC_DAIFMT_LEFT_J
> +#define SND_SOC_DAIFMT_LSB             SND_SOC_DAIFMT_RIGHT_J
> +
> +/*
> + * DAI hardware signal inversions.
> + *
> + * Specifies whether the DAI can also support inverted clocks for the specified
> + * format.
> + */
> +#define SND_SOC_DAIFMT_NB_NF   (1 << 8) /* normal bit clock + frame */
> +#define SND_SOC_DAIFMT_NB_IF   (2 << 8) /* normal BCLK + inv FRM */
> +#define SND_SOC_DAIFMT_IB_NF   (3 << 8) /* invert BCLK + nor FRM */
> +#define SND_SOC_DAIFMT_IB_IF   (4 << 8) /* invert BCLK + FRM */
> +
> +/*
> + * DAI hardware clock masters.
> + *
> + * This is wrt the codec, the inverse is true for the interface
> + * i.e. if the codec is clk and FRM master then the interface is
> + * clk and frame slave.
> + */
> +#define SND_SOC_DAIFMT_CBM_CFM (1 << 12) /* codec clk & FRM master */
> +#define SND_SOC_DAIFMT_CBS_CFM (2 << 12) /* codec clk slave & FRM master */
> +#define SND_SOC_DAIFMT_CBM_CFS (3 << 12) /* codec clk master & frame slave */
> +#define SND_SOC_DAIFMT_CBS_CFS (4 << 12) /* codec clk & FRM slave */
> +
> +#define SND_SOC_DAIFMT_FORMAT_MASK     0x000f
> +#define SND_SOC_DAIFMT_CLOCK_MASK      0x00f0
> +#define SND_SOC_DAIFMT_INV_MASK                0x0f00
> +#define SND_SOC_DAIFMT_MASTER_MASK     0xf000
> +
> +/*
> + * Master Clock Directions
> + */
> +#define SND_SOC_CLOCK_IN               0
> +#define SND_SOC_CLOCK_OUT              1
> +
> +/* I2S Tx Control */
> +#define I2S_TX_ON      1
> +#define I2S_TX_OFF     0
> +
> +#define FIFO_LENGTH    64
> +
> +/* I2s Registers */
> +struct i2s_reg {
> +       unsigned int    con;            /* base + 0 , Control register */
> +       unsigned int    mod;            /* Mode register */
> +       unsigned int    fic;            /* FIFO control register */
> +       unsigned int    psr;            /* Reserved */
> +       unsigned int    txd;            /* Transmit data register */
> +       unsigned int    rxd;            /* Receive Data Register */

Do we need the whitespace between int and the variable name?

> +};
> +
> +/* This structure stores the i2s related information */
> +struct i2stx_info {
> +       unsigned int rfs;               /* LR clock frame size */
> +       unsigned int bfs;               /* Bit slock frame size */
> +       unsigned int audio_pll_clk;     /* Audio pll frequency in Hz */
> +       unsigned int samplingrate;      /* sampling rate */
> +       unsigned int bitspersample;     /* bits per sample */
> +       unsigned int channels;          /* audio channels */
> +       unsigned int base_address;      /* I2S Register Base */
> +};
> +
> +/*
> + * Sends the given data through i2s tx
> + *
> + * @param pi2s_tx      pointer of i2s transmitter parameter structure.
> + * @param *data                address of the data buffer

Remove *

> + * @param data_size    array size of the int buffer (total size / size of int)
> + *
> + * @return             int value 0 for success, -1 in case of error
> + */
> +int i2s_transfer_tx_data(struct i2stx_info *pi2s_tx, unsigned *data,
> +                               unsigned long data_size);
> +
> +/*
> + * Initialise i2s transmiter
> + *
> + * @param pi2s_tx      pointer of i2s transmitter parameter structure.
> + *
> + * @return             int value 0 for success, -1 in case of error
> + */
> +int i2s_tx_init(struct i2stx_info *pi2s_tx);
> +
> +#endif /* __I2S_H__ */
> diff --git a/include/sound.h b/include/sound.h
> new file mode 100644
> index 0000000..ea0b115
> --- /dev/null
> +++ b/include/sound.h
> @@ -0,0 +1,62 @@
> +/*
> + * 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
> + */
> +
> +#ifndef __SOUND_H__
> +#define __SOUND_H__
> +
> +/* sound codec enum */
> +enum en_sound_codec {
> +       CODEC_WM_8994,
> +       CODEC_WM_8995,
> +       CODEC_MAX
> +};
> +
> +/* sound codec enum */
> +enum sound_compat {
> +       AUDIO_COMPAT_SPI,
> +       AUDIO_COMPAT_I2C,
> +};
> +
> +/* Codec information structure to store the info from device tree */
> +struct sound_codec_info {
> +       int i2c_bus;
> +       int i2c_dev_addr;
> +       enum en_sound_codec codec_type;
> +};
> +
> +/*
> + * Initialises audio sub system
> + *
> + * @return     int value 0 for success, -1 for error
> + */
> +int sound_init(void);
> +
> +/*
> + * plays the pcm data buffer in pcm_data.h through i2s1 to make the
> + * sine wave sound
> + *
> + * @return     int 0 for success, -1 for error
> + */
> +int sound_play(uint32_t msec, uint32_t frequency);
> +
> +#endif  /* __SOUND__H__ */
> --
> 1.7.4.4
>

Regards,
Simon
Rajeshwari Birje Oct. 26, 2012, 4:22 a.m. | #2
Hi Simon Glass,

Thank you for the comments.
Will correct the issues mentioned.

Regards,
Rajeshwari Shinde.


On Thu, Oct 25, 2012 at 10:32 PM, Simon Glass <sjg@chromium.org> wrote:

> Hi,
>
> On Mon, Oct 22, 2012 at 11:57 PM, Rajeshwari Shinde
> <rajeshwari.s@samsung.com> wrote:
> > This patch adds driver for I2S interface specific to samsung.
> >
> > Signed-off-by: R. Chandrasekar <rcsekar@samsung.com>
> > Signed-off-by: Rajeshwari Shinde <rajeshwari.s@samsung.com>
> > ---
> > Changes in V2:
> > - renamed i2s.c to samsung-i2s.c.
> > Changes in V3:
> > - wave sine table removed and the same in calculated in a function.
>
> This looks great. There are a few style nits that you might want to
> correct, but:
>
> Acked-by: Simon Glass <sjg@chromium.org>
>
> >  Makefile                    |    1 +
> >  drivers/sound/Makefile      |   47 ++++++
> >  drivers/sound/samsung-i2s.c |  358
> +++++++++++++++++++++++++++++++++++++++++++
> >  drivers/sound/sound.c       |  228 +++++++++++++++++++++++++++
> >  include/i2s.h               |  127 +++++++++++++++
> >  include/sound.h             |   62 ++++++++
> >  6 files changed, 823 insertions(+), 0 deletions(-)
> >  create mode 100644 drivers/sound/Makefile
> >  create mode 100644 drivers/sound/samsung-i2s.c
> >  create mode 100644 drivers/sound/sound.c
> >  create mode 100644 include/i2s.h
> >  create mode 100644 include/sound.h
> >
> > diff --git a/Makefile b/Makefile
> > index a40d4cc..f7d7f47 100644
> > --- a/Makefile
> > +++ b/Makefile
> > @@ -293,6 +293,7 @@ LIBS-y += arch/powerpc/cpu/mpc8xxx/lib8xxx.o
> >  endif
> >  LIBS-y += drivers/rtc/librtc.o
> >  LIBS-y += drivers/serial/libserial.o
> > +LIBS-y += drivers/sound/libsound.o
> >  LIBS-$(CONFIG_GENERIC_LPC_TPM) += drivers/tpm/libtpm.o
> >  LIBS-y += drivers/twserial/libtws.o
> >  LIBS-y += drivers/usb/eth/libusb_eth.o
> > diff --git a/drivers/sound/Makefile b/drivers/sound/Makefile
> > new file mode 100644
> > index 0000000..18ad2c9
> > --- /dev/null
> > +++ b/drivers/sound/Makefile
> > @@ -0,0 +1,47 @@
> > +#
> > +# 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 $(TOPDIR)/config.mk
> > +
> > +LIB    := $(obj)libsound.o
> > +
> > +COBJS-$(CONFIG_SOUND)  += sound.o
> > +COBJS-$(CONFIG_I2S)    += samsung-i2s.o
> > +
> > +COBJS  := $(COBJS-y)
> > +SRCS   := $(COBJS:.o=.c)
> > +OBJS   := $(addprefix $(obj),$(COBJS))
> > +
> > +all:   $(LIB)
> > +
> > +$(LIB):        $(obj).depend $(OBJS)
> > +       $(call cmd_link_o_target, $(OBJS))
> > +
> >
> +#########################################################################
> > +
> > +# defines $(obj).depend target
> > +include $(SRCTREE)/rules.mk
> > +
> > +sinclude $(obj).depend
> > +
> > +#
> > diff --git a/drivers/sound/samsung-i2s.c b/drivers/sound/samsung-i2s.c
> > new file mode 100644
> > index 0000000..3ce0b59
> > --- /dev/null
> > +++ b/drivers/sound/samsung-i2s.c
> > @@ -0,0 +1,358 @@
> > +/*
> > + * 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;
> > +
> remove blank line
>
> > +       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__);
>
> {} around this else
>
> > +
> > +       return ret;
> > +}
> > diff --git a/drivers/sound/sound.c b/drivers/sound/sound.c
> > new file mode 100644
> > index 0000000..ff76996
> > --- /dev/null
> > +++ b/drivers/sound/sound.c
> > @@ -0,0 +1,228 @@
> > +/*
> > + * 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 <malloc.h>
> > +#include <common.h>
> > +#include <asm/io.h>
> > +#include <i2c.h>
> > +#include <i2s.h>
> > +#include <sound.h>
> > +#include "wm8994.h"
> > +#include <asm/arch/sound.h>
> > +
> > +/* defines */
> > +#define SOUND_400_HZ 400
> > +#define SOUND_BITS_IN_BYTE 8
> > +
> > +/* Globals */
> > +struct i2stx_info g_i2stx_pri;
> > +struct sound_codec_info g_codec_info;
>
> Can these be static? Also comments are nice.
>
> > +
> > +/*
> > + * get_sound_fdt_values gets fdt values for i2s parameters
> > + *
> > + * @param i2stx_info   i2s transmitter transfer param structure
> > + * @param blob         FDT blob
> > + */
> > +static void get_sound_i2s_values(struct i2stx_info *i2s)
> > +{
> > +       i2s->base_address = samsung_get_base_i2s();
> > +       i2s->audio_pll_clk = I2S_PLL_CLK;
> > +       i2s->samplingrate = I2S_SAMPLING_RATE;
> > +       i2s->bitspersample = I2S_BITS_PER_SAMPLE;
> > +       i2s->channels = I2S_CHANNELS;
> > +       i2s->rfs = I2S_RFS;
> > +       i2s->bfs = I2S_BFS;
> > +}
> > +
> > +/*
> > + * Gets fdt values for wm8994 config parameters
> > + *
> > + * @param pcodec_info  codec information structure
> > + * @param blob         FDT blob
> > + * @return             int value, 0 for success
> > + */
> > +static int get_sound_wm8994_values(struct sound_codec_info *pcodec_info)
> > +{
> > +       int error = 0;
> > +
> > +       switch (AUDIO_COMPAT) {
> > +       case AUDIO_COMPAT_SPI:
> > +               debug("%s: Support not added for SPI interface\n",
> __func__);
> > +               return -1;
> > +               break;
> > +       case AUDIO_COMPAT_I2C:
> > +               pcodec_info->i2c_bus = AUDIO_I2C_BUS;
> > +               pcodec_info->i2c_dev_addr = AUDIO_I2C_REG;
> > +               debug("i2c dev addr = %d\n", pcodec_info->i2c_dev_addr);
> > +               break;
> > +       default:
> > +               debug("%s: Unknown compat id %d\n", __func__,
> AUDIO_COMPAT);
> > +               return -1;
> > +       }
> > +
> > +       if (error == -1) {
> > +               debug("fail to get wm8994 codec node properties\n");
> > +               return -1;
> > +       }
> > +
> > +       return 0;
> > +}
> > +
> > +/*
> > + * Gets fdt values for codec config parameters
> > + *
> > + * @param pcodec_info  codec information structure
> > + * @param blob         FDT blob
> > + * @return             int value, 0 for success
> > + */
> > +static int get_sound_codec_values(struct sound_codec_info *pcodec_info)
> > +{
> > +       int error = 0;
> > +       const char *codectype;
> > +
> > +       codectype =  AUDIO_CODEC;
> > +
> > +       if (!strcmp(codectype, "wm8994")) {
> > +               pcodec_info->codec_type = CODEC_WM_8994;
> > +               error = get_sound_wm8994_values(pcodec_info);
> > +       } else
> > +               error = -1;
>
> {} around this else
>
> > +
> > +       if (error == -1) {
> > +               debug("fail to get sound codec node properties\n");
> > +               return -1;
> > +       }
> > +
> > +       return 0;
> > +}
> > +
> > +int sound_init(void)
> > +{
> > +       int ret;
> > +       struct i2stx_info *pi2s_tx = &g_i2stx_pri;
> > +       struct sound_codec_info *pcodec_info = &g_codec_info;
> > +
> > +       /* Get the I2S Values */
> > +       get_sound_i2s_values(pi2s_tx);
> > +
> > +       /* Get the codec Values */
> > +       if (get_sound_codec_values(pcodec_info) < 0)
> > +               return -1;
> > +
> > +       ret = i2s_tx_init(pi2s_tx);
> > +       if (ret) {
> > +               debug("%s: Failed to init i2c transmit: ret=%d\n",
> __func__,
> > +                     ret);
> > +               return ret;
> > +       }
> > +
> > +       /* Check the codec type and initialise the same */
> > +       if (pcodec_info->codec_type == CODEC_WM_8994) {
> > +               ret = wm8994_init(pcodec_info, WM8994_AIF2,
> > +                       pi2s_tx->samplingrate,
> > +                       (pi2s_tx->samplingrate * (pi2s_tx->rfs)),
> > +                       pi2s_tx->bitspersample, pi2s_tx->channels);
> > +       } else {
> > +               debug("%s: Unknown code type %d\n", __func__,
> > +                     pcodec_info->codec_type);
> > +               return -1;
> > +       }
> > +       if (ret) {
> > +               debug("%s: Codec init failed\n", __func__);
> > +               return -1;
> > +       }
> > +
> > +       return ret;
> > +}
> > +
> > +/*
> > + * Generates square wave sound data for 1 second
> > + *
> > + * @param data          data buffer pointer
> > + * @param size          size of the buffer
> > + * @param freq          frequency of the wave
> > + */
> > +static void sound_prepare_buffer(unsigned short *data, int size,
> uint32_t freq)
> > +{
> > +       const int sample = 48000;
> > +       const unsigned short amplitude = 16000; /* between 1 and 32767 */
> > +       const int period = freq ? sample / freq : 0;
> > +       const int half = period / 2;
> > +
> > +       assert(freq);
> > +
> > +       /* Make sure we don't overflow our buffer */
> > +       if (size % 2)
> > +               size--;
> > +
> > +       while (size) {
> > +               int i;
> > +               for (i = 0; size && i < half; i++) {
> > +                       size -= 2;
> > +                       *data++ = amplitude;
> > +                       *data++ = amplitude;
> > +               }
> > +               for (i = 0; size && i < period - half; i++) {
> > +                       size -= 2;
> > +                       *data++ = -amplitude;
> > +                       *data++ = -amplitude;
> > +               }
> > +       }
> > +}
> > +
> > +int sound_play(uint32_t msec, uint32_t frequency)
> > +{
> > +       unsigned int *data;
> > +       unsigned long data_size;
> > +       unsigned int ret = 0;
> > +
> > +       /* Sine wave Buffer length computation */
>
> Not a sine wave anymore - maybe just s/Sine wave //
>
> > +       data_size = g_i2stx_pri.samplingrate * g_i2stx_pri.channels;
> > +       data_size *= (g_i2stx_pri.bitspersample / SOUND_BITS_IN_BYTE);
> > +       data = malloc(data_size);
> > +
> > +       if (data == NULL) {
> > +               debug("%s: malloc failed\n", __func__);
> > +               return -1;
> > +       }
> > +
> > +       sound_prepare_buffer((unsigned short *)data,
> > +                               data_size / sizeof(unsigned short),
> frequency);
> > +
> > +       while (msec >= 1000) {
> > +               ret = i2s_transfer_tx_data(&g_i2stx_pri, data,
> > +                                          (data_size / sizeof(int)));
> > +               msec -= 1000;
> > +       }
> > +       if (msec) {
> > +               unsigned long size =
> > +                       (data_size * msec) / (sizeof(int) * 1000);
> > +
> > +               ret = i2s_transfer_tx_data(&g_i2stx_pri, data, size);
> > +       }
> > +
> > +       free(data);
> > +
> > +       return ret;
> > +}
> > diff --git a/include/i2s.h b/include/i2s.h
> > new file mode 100644
> > index 0000000..f1b642e
> > --- /dev/null
> > +++ b/include/i2s.h
> > @@ -0,0 +1,127 @@
> > +/*
> > + * 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
> > + */
> > +
> > +#ifndef __I2S_H__
> > +#define __I2S_H__
> > +
> > +/*
> > + * DAI hardware audio formats.
> > + *
> > + * Describes the physical PCM data formating and clocking. Add new
> formats
> > + * to the end.
> > + */
> > +#define SND_SOC_DAIFMT_I2S             1 /* I2S mode */
> > +#define SND_SOC_DAIFMT_RIGHT_J         2 /* Right Justified mode */
> > +#define SND_SOC_DAIFMT_LEFT_J          3 /* Left Justified mode */
> > +#define SND_SOC_DAIFMT_DSP_A           4 /* L data MSB after FRM LRC */
> > +#define SND_SOC_DAIFMT_DSP_B           5 /* L data MSB during FRM LRC */
> > +#define SND_SOC_DAIFMT_AC97            6 /* AC97 */
> > +#define SND_SOC_DAIFMT_PDM             7 /* Pulse density modulation */
> > +
> > +/* left and right justified also known as MSB and LSB respectively */
> > +#define SND_SOC_DAIFMT_MSB             SND_SOC_DAIFMT_LEFT_J
> > +#define SND_SOC_DAIFMT_LSB             SND_SOC_DAIFMT_RIGHT_J
> > +
> > +/*
> > + * DAI hardware signal inversions.
> > + *
> > + * Specifies whether the DAI can also support inverted clocks for the
> specified
> > + * format.
> > + */
> > +#define SND_SOC_DAIFMT_NB_NF   (1 << 8) /* normal bit clock + frame */
> > +#define SND_SOC_DAIFMT_NB_IF   (2 << 8) /* normal BCLK + inv FRM */
> > +#define SND_SOC_DAIFMT_IB_NF   (3 << 8) /* invert BCLK + nor FRM */
> > +#define SND_SOC_DAIFMT_IB_IF   (4 << 8) /* invert BCLK + FRM */
> > +
> > +/*
> > + * DAI hardware clock masters.
> > + *
> > + * This is wrt the codec, the inverse is true for the interface
> > + * i.e. if the codec is clk and FRM master then the interface is
> > + * clk and frame slave.
> > + */
> > +#define SND_SOC_DAIFMT_CBM_CFM (1 << 12) /* codec clk & FRM master */
> > +#define SND_SOC_DAIFMT_CBS_CFM (2 << 12) /* codec clk slave & FRM
> master */
> > +#define SND_SOC_DAIFMT_CBM_CFS (3 << 12) /* codec clk master & frame
> slave */
> > +#define SND_SOC_DAIFMT_CBS_CFS (4 << 12) /* codec clk & FRM slave */
> > +
> > +#define SND_SOC_DAIFMT_FORMAT_MASK     0x000f
> > +#define SND_SOC_DAIFMT_CLOCK_MASK      0x00f0
> > +#define SND_SOC_DAIFMT_INV_MASK                0x0f00
> > +#define SND_SOC_DAIFMT_MASTER_MASK     0xf000
> > +
> > +/*
> > + * Master Clock Directions
> > + */
> > +#define SND_SOC_CLOCK_IN               0
> > +#define SND_SOC_CLOCK_OUT              1
> > +
> > +/* I2S Tx Control */
> > +#define I2S_TX_ON      1
> > +#define I2S_TX_OFF     0
> > +
> > +#define FIFO_LENGTH    64
> > +
> > +/* I2s Registers */
> > +struct i2s_reg {
> > +       unsigned int    con;            /* base + 0 , Control register */
> > +       unsigned int    mod;            /* Mode register */
> > +       unsigned int    fic;            /* FIFO control register */
> > +       unsigned int    psr;            /* Reserved */
> > +       unsigned int    txd;            /* Transmit data register */
> > +       unsigned int    rxd;            /* Receive Data Register */
>
> Do we need the whitespace between int and the variable name?
>
> > +};
> > +
> > +/* This structure stores the i2s related information */
> > +struct i2stx_info {
> > +       unsigned int rfs;               /* LR clock frame size */
> > +       unsigned int bfs;               /* Bit slock frame size */
> > +       unsigned int audio_pll_clk;     /* Audio pll frequency in Hz */
> > +       unsigned int samplingrate;      /* sampling rate */
> > +       unsigned int bitspersample;     /* bits per sample */
> > +       unsigned int channels;          /* audio channels */
> > +       unsigned int base_address;      /* I2S Register Base */
> > +};
> > +
> > +/*
> > + * Sends the given data through i2s tx
> > + *
> > + * @param pi2s_tx      pointer of i2s transmitter parameter structure.
> > + * @param *data                address of the data buffer
>
> Remove *
>
> > + * @param data_size    array size of the int buffer (total size / size
> of int)
> > + *
> > + * @return             int value 0 for success, -1 in case of error
> > + */
> > +int i2s_transfer_tx_data(struct i2stx_info *pi2s_tx, unsigned *data,
> > +                               unsigned long data_size);
> > +
> > +/*
> > + * Initialise i2s transmiter
> > + *
> > + * @param pi2s_tx      pointer of i2s transmitter parameter structure.
> > + *
> > + * @return             int value 0 for success, -1 in case of error
> > + */
> > +int i2s_tx_init(struct i2stx_info *pi2s_tx);
> > +
> > +#endif /* __I2S_H__ */
> > diff --git a/include/sound.h b/include/sound.h
> > new file mode 100644
> > index 0000000..ea0b115
> > --- /dev/null
> > +++ b/include/sound.h
> > @@ -0,0 +1,62 @@
> > +/*
> > + * 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
> > + */
> > +
> > +#ifndef __SOUND_H__
> > +#define __SOUND_H__
> > +
> > +/* sound codec enum */
> > +enum en_sound_codec {
> > +       CODEC_WM_8994,
> > +       CODEC_WM_8995,
> > +       CODEC_MAX
> > +};
> > +
> > +/* sound codec enum */
> > +enum sound_compat {
> > +       AUDIO_COMPAT_SPI,
> > +       AUDIO_COMPAT_I2C,
> > +};
> > +
> > +/* Codec information structure to store the info from device tree */
> > +struct sound_codec_info {
> > +       int i2c_bus;
> > +       int i2c_dev_addr;
> > +       enum en_sound_codec codec_type;
> > +};
> > +
> > +/*
> > + * Initialises audio sub system
> > + *
> > + * @return     int value 0 for success, -1 for error
> > + */
> > +int sound_init(void);
> > +
> > +/*
> > + * plays the pcm data buffer in pcm_data.h through i2s1 to make the
> > + * sine wave sound
> > + *
> > + * @return     int 0 for success, -1 for error
> > + */
> > +int sound_play(uint32_t msec, uint32_t frequency);
> > +
> > +#endif  /* __SOUND__H__ */
> > --
> > 1.7.4.4
> >
>
> Regards,
> Simon
> _______________________________________________
> U-Boot mailing list
> U-Boot@lists.denx.de
> http://lists.denx.de/mailman/listinfo/u-boot
>

Patch

diff --git a/Makefile b/Makefile
index a40d4cc..f7d7f47 100644
--- a/Makefile
+++ b/Makefile
@@ -293,6 +293,7 @@  LIBS-y += arch/powerpc/cpu/mpc8xxx/lib8xxx.o
 endif
 LIBS-y += drivers/rtc/librtc.o
 LIBS-y += drivers/serial/libserial.o
+LIBS-y += drivers/sound/libsound.o
 LIBS-$(CONFIG_GENERIC_LPC_TPM) += drivers/tpm/libtpm.o
 LIBS-y += drivers/twserial/libtws.o
 LIBS-y += drivers/usb/eth/libusb_eth.o
diff --git a/drivers/sound/Makefile b/drivers/sound/Makefile
new file mode 100644
index 0000000..18ad2c9
--- /dev/null
+++ b/drivers/sound/Makefile
@@ -0,0 +1,47 @@ 
+#
+# 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 $(TOPDIR)/config.mk
+
+LIB	:= $(obj)libsound.o
+
+COBJS-$(CONFIG_SOUND)	+= sound.o
+COBJS-$(CONFIG_I2S)	+= samsung-i2s.o
+
+COBJS	:= $(COBJS-y)
+SRCS	:= $(COBJS:.o=.c)
+OBJS	:= $(addprefix $(obj),$(COBJS))
+
+all:	$(LIB)
+
+$(LIB):	$(obj).depend $(OBJS)
+	$(call cmd_link_o_target, $(OBJS))
+
+#########################################################################
+
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
+
+sinclude $(obj).depend
+
+#
diff --git a/drivers/sound/samsung-i2s.c b/drivers/sound/samsung-i2s.c
new file mode 100644
index 0000000..3ce0b59
--- /dev/null
+++ b/drivers/sound/samsung-i2s.c
@@ -0,0 +1,358 @@ 
+/*
+ * 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;
+}
diff --git a/drivers/sound/sound.c b/drivers/sound/sound.c
new file mode 100644
index 0000000..ff76996
--- /dev/null
+++ b/drivers/sound/sound.c
@@ -0,0 +1,228 @@ 
+/*
+ * 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 <malloc.h>
+#include <common.h>
+#include <asm/io.h>
+#include <i2c.h>
+#include <i2s.h>
+#include <sound.h>
+#include "wm8994.h"
+#include <asm/arch/sound.h>
+
+/* defines */
+#define SOUND_400_HZ 400
+#define SOUND_BITS_IN_BYTE 8
+
+/* Globals */
+struct i2stx_info g_i2stx_pri;
+struct sound_codec_info g_codec_info;
+
+/*
+ * get_sound_fdt_values gets fdt values for i2s parameters
+ *
+ * @param i2stx_info	i2s transmitter transfer param structure
+ * @param blob		FDT blob
+ */
+static void get_sound_i2s_values(struct i2stx_info *i2s)
+{
+	i2s->base_address = samsung_get_base_i2s();
+	i2s->audio_pll_clk = I2S_PLL_CLK;
+	i2s->samplingrate = I2S_SAMPLING_RATE;
+	i2s->bitspersample = I2S_BITS_PER_SAMPLE;
+	i2s->channels = I2S_CHANNELS;
+	i2s->rfs = I2S_RFS;
+	i2s->bfs = I2S_BFS;
+}
+
+/*
+ * Gets fdt values for wm8994 config parameters
+ *
+ * @param pcodec_info	codec information structure
+ * @param blob		FDT blob
+ * @return		int value, 0 for success
+ */
+static int get_sound_wm8994_values(struct sound_codec_info *pcodec_info)
+{
+	int error = 0;
+
+	switch (AUDIO_COMPAT) {
+	case AUDIO_COMPAT_SPI:
+		debug("%s: Support not added for SPI interface\n", __func__);
+		return -1;
+		break;
+	case AUDIO_COMPAT_I2C:
+		pcodec_info->i2c_bus = AUDIO_I2C_BUS;
+		pcodec_info->i2c_dev_addr = AUDIO_I2C_REG;
+		debug("i2c dev addr = %d\n", pcodec_info->i2c_dev_addr);
+		break;
+	default:
+		debug("%s: Unknown compat id %d\n", __func__, AUDIO_COMPAT);
+		return -1;
+	}
+
+	if (error == -1) {
+		debug("fail to get wm8994 codec node properties\n");
+		return -1;
+	}
+
+	return 0;
+}
+
+/*
+ * Gets fdt values for codec config parameters
+ *
+ * @param pcodec_info	codec information structure
+ * @param blob		FDT blob
+ * @return		int value, 0 for success
+ */
+static int get_sound_codec_values(struct sound_codec_info *pcodec_info)
+{
+	int error = 0;
+	const char *codectype;
+
+	codectype =  AUDIO_CODEC;
+
+	if (!strcmp(codectype, "wm8994")) {
+		pcodec_info->codec_type = CODEC_WM_8994;
+		error = get_sound_wm8994_values(pcodec_info);
+	} else
+		error = -1;
+
+	if (error == -1) {
+		debug("fail to get sound codec node properties\n");
+		return -1;
+	}
+
+	return 0;
+}
+
+int sound_init(void)
+{
+	int ret;
+	struct i2stx_info *pi2s_tx = &g_i2stx_pri;
+	struct sound_codec_info *pcodec_info = &g_codec_info;
+
+	/* Get the I2S Values */
+	get_sound_i2s_values(pi2s_tx);
+
+	/* Get the codec Values */
+	if (get_sound_codec_values(pcodec_info) < 0)
+		return -1;
+
+	ret = i2s_tx_init(pi2s_tx);
+	if (ret) {
+		debug("%s: Failed to init i2c transmit: ret=%d\n", __func__,
+		      ret);
+		return ret;
+	}
+
+	/* Check the codec type and initialise the same */
+	if (pcodec_info->codec_type == CODEC_WM_8994) {
+		ret = wm8994_init(pcodec_info, WM8994_AIF2,
+			pi2s_tx->samplingrate,
+			(pi2s_tx->samplingrate * (pi2s_tx->rfs)),
+			pi2s_tx->bitspersample, pi2s_tx->channels);
+	} else {
+		debug("%s: Unknown code type %d\n", __func__,
+		      pcodec_info->codec_type);
+		return -1;
+	}
+	if (ret) {
+		debug("%s: Codec init failed\n", __func__);
+		return -1;
+	}
+
+	return ret;
+}
+
+/*
+ * Generates square wave sound data for 1 second
+ *
+ * @param data          data buffer pointer
+ * @param size          size of the buffer
+ * @param freq          frequency of the wave
+ */
+static void sound_prepare_buffer(unsigned short *data, int size, uint32_t freq)
+{
+	const int sample = 48000;
+	const unsigned short amplitude = 16000; /* between 1 and 32767 */
+	const int period = freq ? sample / freq : 0;
+	const int half = period / 2;
+
+	assert(freq);
+
+	/* Make sure we don't overflow our buffer */
+	if (size % 2)
+		size--;
+
+	while (size) {
+		int i;
+		for (i = 0; size && i < half; i++) {
+			size -= 2;
+			*data++ = amplitude;
+			*data++ = amplitude;
+		}
+		for (i = 0; size && i < period - half; i++) {
+			size -= 2;
+			*data++ = -amplitude;
+			*data++ = -amplitude;
+		}
+	}
+}
+
+int sound_play(uint32_t msec, uint32_t frequency)
+{
+	unsigned int *data;
+	unsigned long data_size;
+	unsigned int ret = 0;
+
+	/* Sine wave Buffer length computation */
+	data_size = g_i2stx_pri.samplingrate * g_i2stx_pri.channels;
+	data_size *= (g_i2stx_pri.bitspersample / SOUND_BITS_IN_BYTE);
+	data = malloc(data_size);
+
+	if (data == NULL) {
+		debug("%s: malloc failed\n", __func__);
+		return -1;
+	}
+
+	sound_prepare_buffer((unsigned short *)data,
+				data_size / sizeof(unsigned short), frequency);
+
+	while (msec >= 1000) {
+		ret = i2s_transfer_tx_data(&g_i2stx_pri, data,
+					   (data_size / sizeof(int)));
+		msec -= 1000;
+	}
+	if (msec) {
+		unsigned long size =
+			(data_size * msec) / (sizeof(int) * 1000);
+
+		ret = i2s_transfer_tx_data(&g_i2stx_pri, data, size);
+	}
+
+	free(data);
+
+	return ret;
+}
diff --git a/include/i2s.h b/include/i2s.h
new file mode 100644
index 0000000..f1b642e
--- /dev/null
+++ b/include/i2s.h
@@ -0,0 +1,127 @@ 
+/*
+ * 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
+ */
+
+#ifndef __I2S_H__
+#define __I2S_H__
+
+/*
+ * DAI hardware audio formats.
+ *
+ * Describes the physical PCM data formating and clocking. Add new formats
+ * to the end.
+ */
+#define SND_SOC_DAIFMT_I2S		1 /* I2S mode */
+#define SND_SOC_DAIFMT_RIGHT_J		2 /* Right Justified mode */
+#define SND_SOC_DAIFMT_LEFT_J		3 /* Left Justified mode */
+#define SND_SOC_DAIFMT_DSP_A		4 /* L data MSB after FRM LRC */
+#define SND_SOC_DAIFMT_DSP_B		5 /* L data MSB during FRM LRC */
+#define SND_SOC_DAIFMT_AC97		6 /* AC97 */
+#define SND_SOC_DAIFMT_PDM		7 /* Pulse density modulation */
+
+/* left and right justified also known as MSB and LSB respectively */
+#define SND_SOC_DAIFMT_MSB		SND_SOC_DAIFMT_LEFT_J
+#define SND_SOC_DAIFMT_LSB		SND_SOC_DAIFMT_RIGHT_J
+
+/*
+ * DAI hardware signal inversions.
+ *
+ * Specifies whether the DAI can also support inverted clocks for the specified
+ * format.
+ */
+#define SND_SOC_DAIFMT_NB_NF	(1 << 8) /* normal bit clock + frame */
+#define SND_SOC_DAIFMT_NB_IF	(2 << 8) /* normal BCLK + inv FRM */
+#define SND_SOC_DAIFMT_IB_NF	(3 << 8) /* invert BCLK + nor FRM */
+#define SND_SOC_DAIFMT_IB_IF	(4 << 8) /* invert BCLK + FRM */
+
+/*
+ * DAI hardware clock masters.
+ *
+ * This is wrt the codec, the inverse is true for the interface
+ * i.e. if the codec is clk and FRM master then the interface is
+ * clk and frame slave.
+ */
+#define SND_SOC_DAIFMT_CBM_CFM	(1 << 12) /* codec clk & FRM master */
+#define SND_SOC_DAIFMT_CBS_CFM	(2 << 12) /* codec clk slave & FRM master */
+#define SND_SOC_DAIFMT_CBM_CFS	(3 << 12) /* codec clk master & frame slave */
+#define SND_SOC_DAIFMT_CBS_CFS	(4 << 12) /* codec clk & FRM slave */
+
+#define SND_SOC_DAIFMT_FORMAT_MASK	0x000f
+#define SND_SOC_DAIFMT_CLOCK_MASK	0x00f0
+#define SND_SOC_DAIFMT_INV_MASK		0x0f00
+#define SND_SOC_DAIFMT_MASTER_MASK	0xf000
+
+/*
+ * Master Clock Directions
+ */
+#define SND_SOC_CLOCK_IN		0
+#define SND_SOC_CLOCK_OUT		1
+
+/* I2S Tx Control */
+#define I2S_TX_ON	1
+#define I2S_TX_OFF	0
+
+#define FIFO_LENGTH	64
+
+/* I2s Registers */
+struct i2s_reg {
+	unsigned int	con;		/* base + 0 , Control register */
+	unsigned int	mod;		/* Mode register */
+	unsigned int	fic;		/* FIFO control register */
+	unsigned int	psr;		/* Reserved */
+	unsigned int	txd;		/* Transmit data register */
+	unsigned int	rxd;		/* Receive Data Register */
+};
+
+/* This structure stores the i2s related information */
+struct i2stx_info {
+	unsigned int rfs;		/* LR clock frame size */
+	unsigned int bfs;		/* Bit slock frame size */
+	unsigned int audio_pll_clk;	/* Audio pll frequency in Hz */
+	unsigned int samplingrate;	/* sampling rate */
+	unsigned int bitspersample;	/* bits per sample */
+	unsigned int channels;		/* audio channels */
+	unsigned int base_address;	/* I2S Register Base */
+};
+
+/*
+ * Sends the given data through i2s tx
+ *
+ * @param pi2s_tx	pointer of i2s transmitter parameter structure.
+ * @param *data		address of the data buffer
+ * @param data_size	array size of the int buffer (total size / size of int)
+ *
+ * @return		int value 0 for success, -1 in case of error
+ */
+int i2s_transfer_tx_data(struct i2stx_info *pi2s_tx, unsigned *data,
+				unsigned long data_size);
+
+/*
+ * Initialise i2s transmiter
+ *
+ * @param pi2s_tx	pointer of i2s transmitter parameter structure.
+ *
+ * @return		int value 0 for success, -1 in case of error
+ */
+int i2s_tx_init(struct i2stx_info *pi2s_tx);
+
+#endif /* __I2S_H__ */
diff --git a/include/sound.h b/include/sound.h
new file mode 100644
index 0000000..ea0b115
--- /dev/null
+++ b/include/sound.h
@@ -0,0 +1,62 @@ 
+/*
+ * 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
+ */
+
+#ifndef __SOUND_H__
+#define __SOUND_H__
+
+/* sound codec enum */
+enum en_sound_codec {
+	CODEC_WM_8994,
+	CODEC_WM_8995,
+	CODEC_MAX
+};
+
+/* sound codec enum */
+enum sound_compat {
+	AUDIO_COMPAT_SPI,
+	AUDIO_COMPAT_I2C,
+};
+
+/* Codec information structure to store the info from device tree */
+struct sound_codec_info {
+	int i2c_bus;
+	int i2c_dev_addr;
+	enum en_sound_codec codec_type;
+};
+
+/*
+ * Initialises audio sub system
+ *
+ * @return	int value 0 for success, -1 for error
+ */
+int sound_init(void);
+
+/*
+ * plays the pcm data buffer in pcm_data.h through i2s1 to make the
+ * sine wave sound
+ *
+ * @return	int 0 for success, -1 for error
+ */
+int sound_play(uint32_t msec, uint32_t frequency);
+
+#endif  /* __SOUND__H__ */