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ASoC: Implement support for CLK_POUT as MCLK on Zylonite

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The Zylonite supports switching the MCLK for the WM9713 between the
AC97CLK and CLK_POUT outputs of the PXA processor via switch SW15 on
the board. This patch adds support for configuring the system to use
CLK_POUT.

Unfortunately it is not possible to read the state of SW15 from software
so this feature is controlled by a module option 'clk_pout' which should
be set to a non-zero value to enable the use of CLK_POUT.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Mark Brown 2009-01-16 16:35:52 +00:00
parent c42f69bb06
commit 2c782f5981
1 changed files with 84 additions and 17 deletions
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101
sound/soc/pxa/zylonite.c
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@ -14,6 +14,7 @@
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/device.h>
#include <linux/clk.h>
#include <linux/i2c.h>
#include <sound/core.h>
#include <sound/pcm.h>
@ -26,6 +27,17 @@
#include "pxa2xx-ac97.h"
#include "pxa-ssp.h"
/*
* There is a physical switch SW15 on the board which changes the MCLK
* for the WM9713 between the standard AC97 master clock and the
* output of the CLK_POUT signal from the PXA.
*/
static int clk_pout;
module_param(clk_pout, int, 0);
MODULE_PARM_DESC(clk_pout, "Use CLK_POUT as WM9713 MCLK (SW15 on board).");
static struct clk *pout;
static struct snd_soc_card zylonite;
static const struct snd_soc_dapm_widget zylonite_dapm_widgets[] = {
@ -61,10 +73,8 @@ static const struct snd_soc_dapm_route audio_map[] = {
static int zylonite_wm9713_init(struct snd_soc_codec *codec)
{
/* Currently we only support use of the AC97 clock here. If
* CLK_POUT is selected by SW15 then the clock API will need
* to be used to request and enable it here.
*/
if (clk_pout)
snd_soc_dai_set_pll(&codec->dai[0], 0, clk_get_rate(pout), 0);
snd_soc_dapm_new_controls(codec, zylonite_dapm_widgets,
ARRAY_SIZE(zylonite_dapm_widgets));
@ -85,7 +95,6 @@ static int zylonite_voice_hw_params(struct snd_pcm_substream *substream,
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_soc_dai *codec_dai = rtd->dai->codec_dai;
struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
unsigned int pll_out = 0;
unsigned int acds = 0;
unsigned int wm9713_div = 0;
int ret = 0;
@ -93,16 +102,13 @@ static int zylonite_voice_hw_params(struct snd_pcm_substream *substream,
switch (params_rate(params)) {
case 8000:
wm9713_div = 12;
pll_out = 2048000;
break;
case 16000:
wm9713_div = 6;
pll_out = 4096000;
break;
case 48000:
default:
wm9713_div = 2;
pll_out = 12288000;
acds = 1;
break;
}
@ -123,10 +129,6 @@ static int zylonite_voice_hw_params(struct snd_pcm_substream *substream,
if (ret < 0)
return ret;
ret = snd_soc_dai_set_pll(cpu_dai, 0, 0, pll_out);
if (ret < 0)
return ret;
ret = snd_soc_dai_set_clkdiv(cpu_dai, PXA_SSP_AUDIO_DIV_ACDS, acds);
if (ret < 0)
return ret;
@ -135,11 +137,12 @@ static int zylonite_voice_hw_params(struct snd_pcm_substream *substream,
if (ret < 0)
return ret;
/* Note that if the PLL is in use the WM9713_PCMCLK_PLL_DIV needs
* to be set instead.
*/
ret = snd_soc_dai_set_clkdiv(codec_dai, WM9713_PCMCLK_DIV,
WM9713_PCMDIV(wm9713_div));
if (clk_pout)
ret = snd_soc_dai_set_clkdiv(codec_dai, WM9713_PCMCLK_PLL_DIV,
WM9713_PCMDIV(wm9713_div));
else
ret = snd_soc_dai_set_clkdiv(codec_dai, WM9713_PCMCLK_DIV,
WM9713_PCMDIV(wm9713_div));
if (ret < 0)
return ret;
@ -173,8 +176,72 @@ static struct snd_soc_dai_link zylonite_dai[] = {
},
};
static int zylonite_probe(struct platform_device *pdev)
{
int ret;
if (clk_pout) {
pout = clk_get(NULL, "CLK_POUT");
if (IS_ERR(pout)) {
dev_err(&pdev->dev, "Unable to obtain CLK_POUT: %ld\n",
PTR_ERR(pout));
return PTR_ERR(pout);
}
ret = clk_enable(pout);
if (ret != 0) {
dev_err(&pdev->dev, "Unable to enable CLK_POUT: %d\n",
ret);
clk_put(pout);
return ret;
}
dev_dbg(&pdev->dev, "MCLK enabled at %luHz\n",
clk_get_rate(pout));
}
return 0;
}
static int zylonite_remove(struct platform_device *pdev)
{
if (clk_pout) {
clk_disable(pout);
clk_put(pout);
}
return 0;
}
static int zylonite_suspend_post(struct platform_device *pdev,
pm_message_t state)
{
if (clk_pout)
clk_disable(pout);
return 0;
}
static int zylonite_resume_pre(struct platform_device *pdev)
{
int ret = 0;
if (clk_pout) {
ret = clk_enable(pout);
if (ret != 0)
dev_err(&pdev->dev, "Unable to enable CLK_POUT: %d\n",
ret);
}
return ret;
}
static struct snd_soc_card zylonite = {
.name = "Zylonite",
.probe = &zylonite_probe,
.remove = &zylonite_remove,
.suspend_post = &zylonite_suspend_post,
.resume_pre = &zylonite_resume_pre,
.platform = &pxa2xx_soc_platform,
.dai_link = zylonite_dai,
.num_links = ARRAY_SIZE(zylonite_dai),