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ASoC: Add FLL support for WM8400

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Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Mark Brown 2009-03-18 18:28:01 +00:00
parent 24a51029fc
commit e8523b641c
1 changed files with 129 additions and 0 deletions
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129
sound/soc/codecs/wm8400.c
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@ -70,6 +70,7 @@ struct wm8400_priv {
unsigned int sysclk;
unsigned int pcmclk;
struct work_struct work;
int fll_in, fll_out;
};
static inline unsigned int wm8400_read(struct snd_soc_codec *codec,
@ -931,6 +932,133 @@ static int wm8400_set_dai_sysclk(struct snd_soc_dai *codec_dai,
return 0;
}
struct fll_factors {
u16 n;
u16 k;
u16 outdiv;
u16 fratio;
u16 freq_ref;
};
#define FIXED_FLL_SIZE ((1 << 16) * 10)
static int fll_factors(struct wm8400_priv *wm8400, struct fll_factors *factors,
unsigned int Fref, unsigned int Fout)
{
u64 Kpart;
unsigned int K, Nmod, target;
factors->outdiv = 2;
while (Fout * factors->outdiv < 90000000 ||
Fout * factors->outdiv > 100000000) {
factors->outdiv *= 2;
if (factors->outdiv > 32) {
dev_err(wm8400->wm8400->dev,
"Unsupported FLL output frequency %dHz\n",
Fout);
return -EINVAL;
}
}
target = Fout * factors->outdiv;
factors->outdiv = factors->outdiv >> 2;
if (Fref < 48000)
factors->freq_ref = 1;
else
factors->freq_ref = 0;
if (Fref < 1000000)
factors->fratio = 9;
else
factors->fratio = 0;
/* Ensure we have a fractional part */
do {
if (Fref < 1000000)
factors->fratio--;
else
factors->fratio++;
if (factors->fratio < 1 || factors->fratio > 8) {
dev_err(wm8400->wm8400->dev,
"Unable to calculate FRATIO\n");
return -EINVAL;
}
factors->n = target / (Fref * factors->fratio);
Nmod = target % (Fref * factors->fratio);
} while (Nmod == 0);
/* Calculate fractional part - scale up so we can round. */
Kpart = FIXED_FLL_SIZE * (long long)Nmod;
do_div(Kpart, (Fref * factors->fratio));
K = Kpart & 0xFFFFFFFF;
if ((K % 10) >= 5)
K += 5;
/* Move down to proper range now rounding is done */
factors->k = K / 10;
dev_dbg(wm8400->wm8400->dev,
"FLL: Fref=%d Fout=%d N=%x K=%x, FRATIO=%x OUTDIV=%x\n",
Fref, Fout,
factors->n, factors->k, factors->fratio, factors->outdiv);
return 0;
}
static int wm8400_set_dai_pll(struct snd_soc_dai *codec_dai, int pll_id,
unsigned int freq_in, unsigned int freq_out)
{
struct snd_soc_codec *codec = codec_dai->codec;
struct wm8400_priv *wm8400 = codec->private_data;
struct fll_factors factors;
int ret;
u16 reg;
if (freq_in == wm8400->fll_in && freq_out == wm8400->fll_out)
return 0;
if (freq_out != 0) {
ret = fll_factors(wm8400, &factors, freq_in, freq_out);
if (ret != 0)
return ret;
}
wm8400->fll_out = freq_out;
wm8400->fll_in = freq_in;
/* We *must* disable the FLL before any changes */
reg = wm8400_read(codec, WM8400_POWER_MANAGEMENT_2);
reg &= ~WM8400_FLL_ENA;
wm8400_write(codec, WM8400_POWER_MANAGEMENT_2, reg);
reg = wm8400_read(codec, WM8400_FLL_CONTROL_1);
reg &= ~WM8400_FLL_OSC_ENA;
wm8400_write(codec, WM8400_FLL_CONTROL_1, reg);
if (freq_out == 0)
return 0;
reg &= ~(WM8400_FLL_REF_FREQ | WM8400_FLL_FRATIO_MASK);
reg |= WM8400_FLL_FRAC | factors.fratio;
reg |= factors.freq_ref << WM8400_FLL_REF_FREQ_SHIFT;
wm8400_write(codec, WM8400_FLL_CONTROL_1, reg);
wm8400_write(codec, WM8400_FLL_CONTROL_2, factors.k);
wm8400_write(codec, WM8400_FLL_CONTROL_3, factors.n);
reg = wm8400_read(codec, WM8400_FLL_CONTROL_4);
reg &= WM8400_FLL_OUTDIV_MASK;
reg |= factors.outdiv;
wm8400_write(codec, WM8400_FLL_CONTROL_4, reg);
return 0;
}
/*
* Sets ADC and Voice DAC format.
*/
@ -1188,6 +1316,7 @@ static struct snd_soc_dai_ops wm8400_dai_ops = {
.set_fmt = wm8400_set_dai_fmt,
.set_clkdiv = wm8400_set_dai_clkdiv,
.set_sysclk = wm8400_set_dai_sysclk,
.set_pll = wm8400_set_dai_pll,
};
/*