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authorFrank Mandarino <fmandarino@endrelia.com>2007-02-02 17:19:58 +0100
committerJaroslav Kysela <perex@suse.cz>2007-02-09 09:03:45 +0100
commitc8044274c7f1e269975b2bd55d057ceb7708e929 (patch)
tree7f0b4d7dc3bf5bb58b978f773be37e001e8dfa35 /sound
parent6297027629a9349301e08442b67deb9783a5e984 (diff)
[ALSA] soc - ASoC 0.13 AT91xxxx Eti_B1 board support
This patch updates the EtI B1 machine driver to the new API in ASoC 0.13. Changes:- o Manually configure DAI hardware format. o Removed config_sysclk() function. No longer needed as clocking is now configured manually. Signed-off-by: Frank Mandarino <fmandarino@endrelia.com> Signed-off-by: Liam Girdwood <lg@opensource.wolfsonmicro.com> Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Jaroslav Kysela <perex@suse.cz>
Diffstat (limited to 'sound')
-rw-r--r--sound/soc/at91/eti_b1_wm8731.c141
1 files changed, 124 insertions, 17 deletions
diff --git a/sound/soc/at91/eti_b1_wm8731.c b/sound/soc/at91/eti_b1_wm8731.c
index 089cdc9e7265..8179df3bb2f3 100644
--- a/sound/soc/at91/eti_b1_wm8731.c
+++ b/sound/soc/at91/eti_b1_wm8731.c
@@ -18,9 +18,6 @@
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
- * Revision history
- * 30th Nov 2005 Initial version.
- *
*/
#include <linux/module.h>
@@ -43,9 +40,10 @@
#include "../codecs/wm8731.h"
#include "at91-pcm.h"
+#include "at91-i2s.h"
#if 0
-#define DBG(x...) printk(KERN_INFO "eti_b1_wm8731:" x)
+#define DBG(x...) printk(KERN_INFO "eti_b1_wm8731: " x)
#else
#define DBG(x...)
#endif
@@ -57,12 +55,29 @@
#define AT91_PIO_RK1 (1 << (AT91_PIN_PB10 - PIN_BASE) % 32)
#define AT91_PIO_RF1 (1 << (AT91_PIN_PB11 - PIN_BASE) % 32)
-
static struct clk *pck1_clk;
static struct clk *pllb_clk;
+
static int eti_b1_startup(struct snd_pcm_substream *substream)
{
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct snd_soc_codec_dai *codec_dai = rtd->dai->codec_dai;
+ struct snd_soc_cpu_dai *cpu_dai = rtd->dai->cpu_dai;
+ int ret;
+
+ /* cpu clock is the AT91 master clock sent to the SSC */
+ ret = cpu_dai->dai_ops.set_sysclk(cpu_dai, AT91_SYSCLK_MCK,
+ 60000000, SND_SOC_CLOCK_IN);
+ if (ret < 0)
+ return ret;
+
+ /* codec system clock is supplied by PCK1, set to 12MHz */
+ ret = codec_dai->dai_ops.set_sysclk(codec_dai, WM8731_SYSCLK,
+ 12000000, SND_SOC_CLOCK_IN);
+ if (ret < 0)
+ return ret;
+
/* Start PCK1 clock. */
clk_enable(pck1_clk);
DBG("pck1 started\n");
@@ -77,8 +92,105 @@ static void eti_b1_shutdown(struct snd_pcm_substream *substream)
DBG("pck1 stopped\n");
}
+static int eti_b1_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params)
+{
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct snd_soc_codec_dai *codec_dai = rtd->dai->codec_dai;
+ struct snd_soc_cpu_dai *cpu_dai = rtd->dai->cpu_dai;
+ int ret;
+
+#ifdef CONFIG_SND_AT91_SOC_ETI_SLAVE
+ unsigned int rate;
+ int cmr_div, period;
+
+ /* set codec DAI configuration */
+ ret = codec_dai->dai_ops.set_fmt(codec_dai, SND_SOC_DAIFMT_I2S |
+ SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS);
+ if (ret < 0)
+ return ret;
+
+ /* set cpu DAI configuration */
+ ret = cpu_dai->dai_ops.set_fmt(cpu_dai, SND_SOC_DAIFMT_I2S |
+ SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS);
+ if (ret < 0)
+ return ret;
+
+ /*
+ * The SSC clock dividers depend on the sample rate. The CMR.DIV
+ * field divides the system master clock MCK to drive the SSC TK
+ * signal which provides the codec BCLK. The TCMR.PERIOD and
+ * RCMR.PERIOD fields further divide the BCLK signal to drive
+ * the SSC TF and RF signals which provide the codec DACLRC and
+ * ADCLRC clocks.
+ *
+ * The dividers were determined through trial and error, where a
+ * CMR.DIV value is chosen such that the resulting BCLK value is
+ * divisible, or almost divisible, by (2 * sample rate), and then
+ * the TCMR.PERIOD or RCMR.PERIOD is BCLK / (2 * sample rate) - 1.
+ */
+ rate = params_rate(params);
+
+ switch (rate) {
+ case 8000:
+ cmr_div = 25; /* BCLK = 60MHz/(2*25) = 1.2MHz */
+ period = 74; /* LRC = BCLK/(2*(74+1)) = 8000Hz */
+ break;
+ case 32000:
+ cmr_div = 7; /* BCLK = 60MHz/(2*7) ~= 4.28571428MHz */
+ period = 66; /* LRC = BCLK/(2*(66+1)) = 31982.942Hz */
+ break;
+ case 48000:
+ cmr_div = 13; /* BCLK = 60MHz/(2*13) ~= 2.3076923MHz */
+ period = 23; /* LRC = BCLK/(2*(23+1)) = 48076.923Hz */
+ break;
+ default:
+ printk(KERN_WARNING "unsupported rate %d on ETI-B1 board\n", rate);
+ return -EINVAL;
+ }
+
+ /* set the MCK divider for BCLK */
+ ret = cpu_dai->dai_ops.set_clkdiv(cpu_dai, AT91SSC_CMR_DIV, cmr_div);
+ if (ret < 0)
+ return ret;
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ /* set the BCLK divider for DACLRC */
+ ret = cpu_dai->dai_ops.set_clkdiv(cpu_dai,
+ AT91SSC_TCMR_PERIOD, period);
+ } else {
+ /* set the BCLK divider for ADCLRC */
+ ret = cpu_dai->dai_ops.set_clkdiv(cpu_dai,
+ AT91SSC_RCMR_PERIOD, period);
+ }
+ if (ret < 0)
+ return ret;
+
+#else /* CONFIG_SND_AT91_SOC_ETI_SLAVE */
+ /*
+ * Codec in Master Mode.
+ */
+
+ /* set codec DAI configuration */
+ ret = codec_dai->dai_ops.set_fmt(codec_dai, SND_SOC_DAIFMT_I2S |
+ SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBM_CFM);
+ if (ret < 0)
+ return ret;
+
+ /* set cpu DAI configuration */
+ ret = cpu_dai->dai_ops.set_fmt(cpu_dai, SND_SOC_DAIFMT_I2S |
+ SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBM_CFM);
+ if (ret < 0)
+ return ret;
+
+#endif /* CONFIG_SND_AT91_SOC_ETI_SLAVE */
+
+ return 0;
+}
+
static struct snd_soc_ops eti_b1_ops = {
.startup = eti_b1_startup,
+ .hw_params = eti_b1_hw_params,
.shutdown = eti_b1_shutdown,
};
@@ -134,29 +246,19 @@ static int eti_b1_wm8731_init(struct snd_soc_codec *codec)
return 0;
}
-unsigned int eti_b1_config_sysclk(struct snd_soc_pcm_runtime *rtd,
- struct snd_soc_clock_info *info)
-{
- if(info->bclk_master & SND_SOC_DAIFMT_CBS_CFS) {
- return rtd->codec_dai->config_sysclk(rtd->codec_dai, info, 12000000);
- }
- return 0;
-}
-
static struct snd_soc_dai_link eti_b1_dai = {
.name = "WM8731",
.stream_name = "WM8731",
.cpu_dai = &at91_i2s_dai[1],
.codec_dai = &wm8731_dai,
.init = eti_b1_wm8731_init,
- .config_sysclk = eti_b1_config_sysclk,
+ .ops = &eti_b1_ops,
};
static struct snd_soc_machine snd_soc_machine_eti_b1 = {
.name = "ETI_B1",
.dai_link = &eti_b1_dai,
.num_links = 1,
- .ops = &eti_b1_ops,
};
static struct wm8731_setup_data eti_b1_wm8731_setup = {
@@ -210,7 +312,7 @@ static int __init eti_b1_init(void)
}
ssc_pio_lines = AT91_PIO_TF1 | AT91_PIO_TK1 | AT91_PIO_TD1
- | AT91_PIO_RD1 /* | AT91_PIO_RK1 | AT91_PIO_RF1 */;
+ | AT91_PIO_RD1 /* | AT91_PIO_RK1 */ | AT91_PIO_RF1;
/* Reset all PIO registers and assign lines to peripheral A */
at91_sys_write(AT91_PIOB + PIO_PDR, ssc_pio_lines);
@@ -237,6 +339,11 @@ static int __init eti_b1_init(void)
/* assign the GPIO pin to PCK1 */
at91_set_B_periph(AT91_PIN_PA24, 0);
+#ifdef CONFIG_SND_AT91_SOC_ETI_SLAVE
+ printk(KERN_INFO "eti_b1_wm8731: Codec in Slave Mode\n");
+#else
+ printk(KERN_INFO "eti_b1_wm8731: Codec in Master Mode\n");
+#endif
return ret;
fail_io_unmap:

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