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ASoC: fsi: Add FIFO size calculate

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Signed-off-by: Kuninori Morimoto <morimoto.kuninori@renesas.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Kuninori Morimoto 2010-03-25 19:15:51 +09:00 committed by Mark Brown
parent 10ea76cc25
commit 4a942b457e
1 changed files with 43 additions and 27 deletions
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70
sound/soc/sh/fsi.c
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@ -46,8 +46,9 @@
#define MUTE 0x020C
#define CLK_RST 0x0210
#define SOFT_RST 0x0214
#define FIFO_SZ 0x0218
#define MREG_START INT_ST
#define MREG_END SOFT_RST
#define MREG_END FIFO_SZ
/* DO_FMT */
/* DI_FMT */
@ -85,6 +86,11 @@
#define IR (1 << 4) /* Interrupt Reset */
#define FSISR (1 << 0) /* Software Reset */
/* FIFO_SZ */
#define OUT_SZ_MASK 0x7
#define BO_SZ_SHIFT 8
#define AO_SZ_SHIFT 0
#define FSI_RATES SNDRV_PCM_RATE_8000_96000
#define FSI_FMTS (SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S16_LE)
@ -384,9 +390,42 @@ static void fsi_clk_ctrl(struct fsi_priv *fsi, int enable)
fsi_master_mask_set(master, CLK_RST, val, 0);
}
static void fsi_fifo_init(struct fsi_priv *fsi, int is_play)
static void fsi_fifo_init(struct fsi_priv *fsi,
int is_play,
struct snd_soc_dai *dai)
{
u32 ctrl;
struct fsi_master *master = fsi_get_master(fsi);
u32 ctrl, shift, i;
/* get on-chip RAM capacity */
shift = fsi_master_read(master, FIFO_SZ);
shift >>= fsi_is_port_a(fsi) ? AO_SZ_SHIFT : BO_SZ_SHIFT;
shift &= OUT_SZ_MASK;
fsi->fifo_max = 256 << shift;
dev_dbg(dai->dev, "fifo = %d words\n", fsi->fifo_max);
/*
* The maximum number of sample data varies depending
* on the number of channels selected for the format.
*
* FIFOs are used in 4-channel units in 3-channel mode
* and in 8-channel units in 5- to 7-channel mode
* meaning that more FIFOs than the required size of DPRAM
* are used.
*
* ex) if 256 words of DP-RAM is connected
* 1 channel: 256 (256 x 1 = 256)
* 2 channels: 128 (128 x 2 = 256)
* 3 channels: 64 ( 64 x 3 = 192)
* 4 channels: 64 ( 64 x 4 = 256)
* 5 channels: 32 ( 32 x 5 = 160)
* 6 channels: 32 ( 32 x 6 = 192)
* 7 channels: 32 ( 32 x 7 = 224)
* 8 channels: 32 ( 32 x 8 = 256)
*/
for (i = 1; i < fsi->chan; i <<= 1)
fsi->fifo_max >>= 1;
dev_dbg(dai->dev, "%d channel %d store\n", fsi->chan, fsi->fifo_max);
ctrl = is_play ? DOFF_CTL : DIFF_CTL;
@ -689,29 +728,6 @@ static int fsi_dai_startup(struct snd_pcm_substream *substream,
dev_err(dai->dev, "unknown format.\n");
return -EINVAL;
}
switch (fsi->chan) {
case 1:
fsi->fifo_max = 256;
break;
case 2:
fsi->fifo_max = 128;
break;
case 3:
case 4:
fsi->fifo_max = 64;
break;
case 5:
case 6:
case 7:
case 8:
fsi->fifo_max = 32;
break;
default:
dev_err(dai->dev, "channel size error.\n");
return -EINVAL;
}
fsi_reg_write(fsi, reg, data);
/*
@ -725,7 +741,7 @@ static int fsi_dai_startup(struct snd_pcm_substream *substream,
fsi_irq_clear_status(fsi);
/* fifo init */
fsi_fifo_init(fsi, is_play);
fsi_fifo_init(fsi, is_play, dai);
return ret;
}