[5/7,V2] Sound: Add FDT support to driver

This patch adds FDT support to the sound driver.

Signed-off-by: Rajeshwari Shinde <rajeshwari.s@samsung.com>
---
Changes in V2:
        - Made single function to get i2s values,codec init and sount init in
        both FDT and non FDT support case.
 drivers/sound/sound.c |  179 +++++++++++++++++++++++++++++-------------------
 include/sound.h       |    4 +-
 2 files changed, 110 insertions(+), 73 deletions(-)

Hi Rajeshwari,

On Tue, Nov 27, 2012 at 10:10 PM, Rajeshwari Shinde
<rajeshwari.s@samsung.com> wrote:
> This patch adds FDT support to the sound driver.
>
> Signed-off-by: Rajeshwari Shinde <rajeshwari.s@samsung.com>
> ---
> Changes in V2:
>         - Made single function to get i2s values,codec init and sount init in
>         both FDT and non FDT support case.
>  drivers/sound/sound.c |  179 +++++++++++++++++++++++++++++-------------------
>  include/sound.h       |    4 +-
>  2 files changed, 110 insertions(+), 73 deletions(-)
>
> diff --git a/drivers/sound/sound.c b/drivers/sound/sound.c
> index 4c74534..bc87a9b 100644
> --- a/drivers/sound/sound.c
> +++ b/drivers/sound/sound.c
> @@ -28,108 +28,160 @@
>  #include <i2s.h>
>  #include <sound.h>
>  #include "wm8994.h"
> +#ifdef CONFIG_OF_CONTROL
> +#include <libfdt.h>
> +#include <fdtdec.h>
> +#else
>  #include <asm/arch/sound.h>
> +#endif

Can we just include all 3 files?

>
>  /* defines */
>  #define SOUND_400_HZ 400
>  #define SOUND_BITS_IN_BYTE 8
>
>  static struct i2stx_info g_i2stx_pri;
> -static struct sound_codec_info g_codec_info;
>
>  /*
> - * get_sound_fdt_values gets fdt values for i2s parameters
> + * get_sound_i2s_values gets values for i2s parameters
>   *
>   * @param i2stx_info   i2s transmitter transfer param structure
> - * @param blob         FDT blob
> + * @param blob         FDT blob if enabled else NULL
>   */
> -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)
> +static int get_sound_i2s_values(struct i2stx_info *i2s, const void *blob)
>  {
> +#ifdef CONFIG_OF_CONTROL
> +       int node;
>         int error = 0;
> +       int base;
>
> -       switch (AUDIO_COMPAT) {
> -       case AUDIO_COMPAT_SPI:
> -               debug("%s: Support not added for SPI interface\n", __func__);
> +       node = fdtdec_next_compatible(blob, 0,
> +                                       COMPAT_SAMSUNG_EXYNOS5_SOUND);
> +       if (node <= 0) {
> +               debug("EXYNOS_SOUND: No node for sound in device tree\n");
>                 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);
> +       }
> +
> +       /*
> +        * Get the pre-defined sound specific values from FDT.
> +        * All of these are expected to be correct otherwise
> +        * wrong register values in i2s setup parameters
> +        * may result in no sound play.
> +        */
> +       base = fdtdec_get_addr(blob, node, "reg");
> +       if (base == FDT_ADDR_T_NONE) {
> +               debug("%s: Missing  i2s base\n", __func__);
>                 return -1;
>         }
> +       i2s->base_address = base;
>
> +       i2s->audio_pll_clk = fdtdec_get_int(blob,
> +                               node, "samsung,i2s-epll-clock-frequency", -1);
> +       error |= i2s->audio_pll_clk;
> +       debug("audio_pll_clk = %d\n", i2s->audio_pll_clk);
> +       i2s->samplingrate = fdtdec_get_int(blob,
> +                               node, "samsung,i2s-sampling-rate", -1);
> +       error |= i2s->samplingrate;
> +       debug("samplingrate = %d\n", i2s->samplingrate);
> +       i2s->bitspersample = fdtdec_get_int(blob,
> +                               node, "samsung,i2s-bits-per-sample", -1);
> +       error |= i2s->bitspersample;
> +       debug("bitspersample = %d\n", i2s->bitspersample);
> +       i2s->channels = fdtdec_get_int(blob,
> +                       node, "samsung,i2s-channels", -1);
> +       error |= i2s->channels;
> +       debug("channels = %d\n", i2s->channels);
> +       i2s->rfs = fdtdec_get_int(blob,
> +                               node, "samsung,i2s-lr-clk-framesize", -1);
> +       error |= i2s->rfs;
> +       debug("rfs = %d\n", i2s->rfs);
> +       i2s->bfs = fdtdec_get_int(blob,
> +                               node, "samsung,i2s-bit-clk-framesize", -1);
> +       error |= i2s->bfs;
> +       debug("bfs = %d\n", i2s->bfs);
>         if (error == -1) {
> -               debug("fail to get wm8994 codec node properties\n");
> +               debug("fail to get sound i2s node properties\n");
>                 return -1;
>         }
> -
> +#else
> +       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;
> +#endif
>         return 0;
>  }
>
>  /*
> - * Gets fdt values for codec config parameters
> + * Init codec
>   *
> - * @param pcodec_info  codec information structure
> - * @param blob         FDT blob
> - * @return             int value, 0 for success
> + * @param blob          FDT blob
> + * @param pi2s_tx      i2s parameters required by codec
> + * @return              int value, 0 for success
>   */
> -static int get_sound_codec_values(struct sound_codec_info *pcodec_info)
> +static int codec_init(const void *blob, struct i2stx_info *pi2s_tx)
>  {
> -       int error = 0;
> +       int ret;
>         const char *codectype;
> +#ifdef CONFIG_OF_CONTROL
> +       int node;
>
> -       codectype =  AUDIO_CODEC;
> +       /* Get the node from FDT for sound */
> +       node = fdtdec_next_compatible(blob, 0, COMPAT_SAMSUNG_EXYNOS5_SOUND);
> +       if (node <= 0) {
> +               debug("EXYNOS_SOUND: No node for sound in device tree\n");
> +               debug("node = %d\n", node);
> +               return -1;
> +       }
>
> +       /*
> +        * Get the pre-defined sound codec specific values from FDT.
> +        * All of these are expected to be correct otherwise sound
> +        * can not be played
> +        */
> +       codectype = fdt_getprop(blob, node, "samsung,codec-type", NULL);
> +       debug("device = %s\n", codectype);
> +#else
> +       codectype =  AUDIO_CODEC;
> +#endif
>         if (!strcmp(codectype, "wm8994")) {
> -               pcodec_info->codec_type = CODEC_WM_8994;
> -               error = get_sound_wm8994_values(pcodec_info);
> +               /* Check the codec type and initialise the same */
> +               ret = wm8994_init(blob, WM8994_AIF2,
> +                       pi2s_tx->samplingrate,
> +                       (pi2s_tx->samplingrate * (pi2s_tx->rfs)),
> +                       pi2s_tx->bitspersample, pi2s_tx->channels);
>         } else {
> -               error = -1;
> +               debug("%s: Unknown code type %s\n", __func__,
> +                     codectype);
> +               return -1;
>         }
> -
> -       if (error == -1) {
> -               debug("fail to get sound codec node properties\n");
> +       if (ret) {
> +               debug("%s: Codec init failed\n", __func__);
>                 return -1;
>         }
>
>         return 0;
>  }
>
> -int sound_init(void)
> +int sound_init(const void *blob)
>  {
>         int ret;
>         struct i2stx_info *pi2s_tx = &g_i2stx_pri;
> -       struct sound_codec_info *pcodec_info = &g_codec_info;
>
> +#ifdef CONFIG_OF_CONTROL
>         /* Get the I2S Values */
> -       get_sound_i2s_values(pi2s_tx);
> -
> -       /* Get the codec Values */
> -       if (get_sound_codec_values(pcodec_info) < 0)
> +       if (get_sound_i2s_values(pi2s_tx, blob) < 0) {
> +               debug(" FDT I2S values failed\n");
>                 return -1;
> -
> +       }
> +       codec_init(blob, pi2s_tx);

I think you should check for failure - debug() and return -1.

> +#else
> +       /* Get the I2S Values */
> +       get_sound_i2s_values(pi2s_tx, NULL);

I think you can pass blob to the function safely always (since it is
NULL if !defined CONFIG_OF_CONTROL). and just make this code comment
with the code above. I hope that means that this #else can disappear.

> +       codec_init(NULL, pi2s_tx);
> +#endif
>         ret = i2s_tx_init(pi2s_tx);
>         if (ret) {
>                 debug("%s: Failed to init i2c transmit: ret=%d\n", __func__,
> @@ -137,21 +189,6 @@ int sound_init(void)
>                 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;
>  }
> diff --git a/include/sound.h b/include/sound.h
> index ea0b115..a9cbeed 100644
> --- a/include/sound.h
> +++ b/include/sound.h
> @@ -46,10 +46,10 @@ struct sound_codec_info {
>
>  /*
>   * Initialises audio sub system
> - *
> + * @param blob Pointer of device tree node.

or NULL if none

>   * @return     int value 0 for success, -1 for error
>   */
> -int sound_init(void);
> +int sound_init(const void *blob);
>
>  /*
>   * plays the pcm data buffer in pcm_data.h through i2s1 to make the
> --
> 1.7.4.4
>

Regards,
Simon