[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>

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: