path: root/target/device/Atmel/arch-arm/kernel-patches-2.6.28-rc6/linux-2.6.28-rc6-at91-wm8731.patch

diff -urN linux-2.6.28-rc6/sound/soc/at91/at91sam9g20ek_wm8731.c linux-2.6.28-rc6-0rig/sound/soc/at91/at91sam9g20ek_wm8731.c
--- linux-2.6.28-rc6/sound/soc/at91/at91sam9g20ek_wm8731.c	1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.28-rc6-0rig/sound/soc/at91/at91sam9g20ek_wm8731.c	2008-11-29 20:33:23.000000000 +0100
@@ -0,0 +1,383 @@
+/*
+ * at91sam9g20ek_wm8731  --  SoC audio for AT91SAM9G20-based Atmel AT91SAM9G20EK board.
+ *
+ * Author:	Ulf Samuelsson <ulf.samuelsson@atmel.com>
+ *		Atmel Nordic AB.
+ * Created:	Mar 29, 2006
+ *
+ * Based on eti_b1_wm8731.c by:
+ *
+ * Authors: Frank Mandarino <fmandarino@endrelia.com>
+ *
+ * which is based on corgi.c by:
+ *
+ * Copyright 2005 Wolfson Microelectronics PLC.
+ * Copyright 2005 Openedhand Ltd.
+ *
+ * Authors: Liam Girdwood <liam.girdwood@wolfsonmicro.com>
+ *          Richard Purdie <richard@openedhand.com>
+ *
+ *  This program is free software; you can redistribute  it and/or modify it
+ *  under  the terms of  the GNU General  Public License as published by the
+ *  Free Software Foundation;  either version 2 of the  License, or (at your
+ *  option) any later version.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/kernel.h>
+#include <linux/clk.h>
+#include <linux/timer.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/soc.h>
+#include <sound/soc-dapm.h>
+
+#include <mach/hardware.h>
+#include <mach/gpio.h>
+
+#include "../codecs/wm8731.h"
+#include "at91-pcm.h"
+#include "at91-ssc.h"
+
+#define	AT91SAM9G20_BASE_SSC AT91SAM9260_BASE_SSC
+#define	AT91SAM9G20_ID_SSC AT91SAM9260_ID_SSC
+
+
+#if 0
+#define	DBG(x...)	printk(KERN_INFO "at91sam9g20ek_wm8731: " x)
+#else
+#define	DBG(x...)
+#endif
+
+static struct clk *pck1_clk;
+static struct clk *pllb_clk;
+
+
+static int at91sam9g20ek_startup(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;
+	int ret;
+
+	/* cpu clock is the AT91 master clock sent to the SSC */
+	ret = snd_soc_dai_set_sysclk(cpu_dai, AT91_SYSCLK_MCK,
+		100000000, SND_SOC_CLOCK_IN);
+	if (ret < 0)
+		return ret;
+
+	/* codec system clock is supplied by PCK1, set to 12MHz */
+	ret = snd_soc_dai_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");
+
+	return 0;
+}
+
+static void at91sam9g20ek_shutdown(struct snd_pcm_substream *substream)
+{
+	/* Stop PCK1 clock. */
+	clk_disable(pck1_clk);
+	DBG("pck1 stopped\n");
+}
+
+static int at91sam9g20ek_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_dai *codec_dai = rtd->dai->codec_dai;
+	struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
+	int ret;
+
+#ifdef CONFIG_SND_AT91_SOC_AT91SAM9G20EK_SLAVE
+	unsigned int rate;
+	int cmr_div, period;
+
+	/* set codec DAI configuration */
+	ret = snd_soc_dai_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 = snd_soc_dai_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.
+	 */
+
+	/*
+         *  8000:       P=25    D=124   IF=2000000.00   OF= 8000.00     ERROR=0.000000
+         * 16000:       P=22    D=70    IF=2272727.27   OF=16005.12     ERROR=0.000320
+         * 32000:       P=17    D=45    IF=2941176.47   OF=31969.31     ERROR=0.000959
+         * 48000:       P=13    D=39    IF=3846153.85   OF=48076.92     ERROR=0.001603
+         * 11025:       P=14    D=161   IF=3571428.57   OF=11022.93     ERROR=0.000188
+         * 22050:       P=14    D=80    IF=3571428.57   OF=22045.86     ERROR=0.000188
+         * 44100:       P=21    D=26    IF=2380952.38   OF=44091.71     ERROR=0.000188
+	 */
+	rate = params_rate(params);
+
+	switch (rate) {
+	case 8000:
+		cmr_div = 25;	/* BCLK = 100MHz/(2*25)  = 2.000000MHz */
+		period = 124;	/* LRC = BCLK/(2*(124+1)) = 8000Hz */
+		break;
+	case 16000:
+		cmr_div = 22;	/* BCLK = 100MHz/(2*22) ~= 2,272727MHz */
+		period = 70;	/* LRC = BCLK/(2*(70+1)) = 16005.12Hz */
+		break;
+	case 32000:
+		cmr_div = 17;	/* BCLK = 100MHz/(2*17) ~= 2.941176MHz */
+		period = 45;	/* LRC = BCLK/(2*(45+1)) = 31969.31Hz */
+		break;
+	case 48000:
+		cmr_div = 13;	/* BCLK = 100MHz/(2*13) ~= 3.846154MHz */
+		period = 39;	/* LRC = BCLK/(2*(39+1)) = 48076.92Hz */
+		break;
+	case 11025:
+		cmr_div = 14;	/* BCLK = 100MHz/(2*14) ~= 3.571429MHz */
+		period = 161;	/* LRC = BCLK/(2*(161+1)) = 11022.93Hz */
+		break;
+	case 22050:
+		cmr_div = 14;	/* BCLK = 100MHz/(2*14) ~= 3.571429MHz */
+		period = 80;	/* LRC = BCLK/(2*(80+1)) = 22045.86Hz */
+		break;
+	case 44100:
+		cmr_div = 21;	/* BCLK = 100MHz/(2*21) ~= 2.380952MHz */
+		period = 26;	/* LRC = BCLK/(2*(26+1)) = 44091.71Hz */
+		break;
+	default:
+		printk(KERN_WARNING "unsupported rate %d on AT91SAM9G20EK board\n", rate);
+		return -EINVAL;
+	}
+
+	/* set the MCK divider for BCLK */
+	ret = snd_soc_dai_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 = snd_soc_dai_set_clkdiv(cpu_dai,
+						AT91SSC_TCMR_PERIOD, period);
+	} else {
+		/* set the BCLK divider for ADCLRC */
+		ret = snd_soc_dai_set_clkdiv(cpu_dai,
+						AT91SSC_RCMR_PERIOD, period);
+	}
+	if (ret < 0)
+		return ret;
+
+#else /* CONFIG_SND_AT91_SOC_AT91SAM9G20EK_SLAVE */
+	/*
+	 * Codec in Master Mode.
+	 */
+
+	/* set codec DAI configuration */
+	ret = snd_soc_dai_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 = snd_soc_dai_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_AT91SAM9G20EK_SLAVE */
+
+	return 0;
+}
+
+static struct snd_soc_ops at91sam9g20ek_ops = {
+	.startup = at91sam9g20ek_startup,
+	.hw_params = at91sam9g20ek_hw_params,
+	.shutdown = at91sam9g20ek_shutdown,
+};
+
+
+static const struct snd_soc_dapm_widget at91sam9g20ek_dapm_widgets[] = {
+	SND_SOC_DAPM_MIC("Int Mic", NULL),
+	SND_SOC_DAPM_SPK("Ext Spk", NULL),
+};
+
+static const struct snd_soc_dapm_route intercon[] = {
+
+	/* speaker connected to LHPOUT */
+	{"Ext Spk", NULL, "LHPOUT"},
+
+	/* mic is connected to Mic Jack, with WM8731 Mic Bias */
+	{"MICIN", NULL, "Mic Bias"},
+	{"Mic Bias", NULL, "Int Mic"},
+};
+
+/*
+ * Logic for a wm8731 as connected on a Atmel AT91SAM9G20EK board.
+ */
+static int at91sam9g20ek_wm8731_init(struct snd_soc_codec *codec)
+{
+	DBG("at91sam9g20ek_wm8731_init() called\n");
+
+	/* Add specific widgets */
+	snd_soc_dapm_new_controls(codec, at91sam9g20ek_dapm_widgets,
+				  ARRAY_SIZE(at91sam9g20ek_dapm_widgets));
+
+	/* Set up specific audio path interconnects */
+	snd_soc_dapm_add_route(codec, intercon, ARRAY_SIZE(intercon));
+
+	/* not connected */
+	snd_soc_dapm_disable_pin(codec, "RLINEIN");
+	snd_soc_dapm_disable_pin(codec, "LLINEIN");
+
+	/* always connected */
+	snd_soc_dapm_enable_pin(codec, "Int Mic");
+	snd_soc_dapm_enable_pin(codec, "Ext Spk");
+
+	snd_soc_dapm_sync(codec);
+
+	return 0;
+}
+
+static struct snd_soc_dai_link at91sam9g20ek_dai = {
+	.name = "WM8731",
+	.stream_name = "WM8731 PCM",
+	.cpu_dai = &at91_ssc_dai[1],
+	.codec_dai = &wm8731_dai,
+	.init = at91sam9g20ek_wm8731_init,
+	.ops = &at91sam9g20ek_ops,
+};
+
+static struct snd_soc_machine snd_soc_machine_at91sam9g20ek = {
+	.name = "AT91SAM9G20EK_WM8731",
+	.dai_link = &at91sam9g20ek_dai,
+	.num_links = 1,
+};
+
+static struct wm8731_setup_data at91sam9g20ek_wm8731_setup = {
+	.i2c_address = 0x1a,
+};
+
+static struct snd_soc_device at91sam9g20ek_snd_devdata = {
+	.machine = &snd_soc_machine_at91sam9g20ek,
+	.platform = &at91_soc_platform,
+	.codec_dev = &soc_codec_dev_wm8731,
+	.codec_data = &at91sam9g20ek_wm8731_setup,
+};
+
+static struct platform_device *at91sam9g20ek_snd_device;
+
+static int __init at91sam9g20ek_init(void)
+{
+	int ret;
+	struct at91_ssc_periph *ssc = at91sam9g20ek_dai.cpu_dai->private_data;
+
+	if (!request_mem_region(AT91SAM9G20_BASE_SSC, SZ_16K, "soc-audio")) {
+		DBG("SSC memory region is busy\n");
+		return -EBUSY;
+	}
+
+	ssc->base = ioremap(AT91SAM9G20_BASE_SSC, SZ_16K);
+	if (!ssc->base) {
+		DBG("SSC memory ioremap failed\n");
+		ret = -ENOMEM;
+		goto fail_release_mem;
+	}
+
+	ssc->pid = AT91SAM9G20_ID_SSC;
+
+	at91sam9g20ek_snd_device = platform_device_alloc("soc-audio", -1);
+	if (!at91sam9g20ek_snd_device) {
+		DBG("platform device allocation failed\n");
+		ret = -ENOMEM;
+		goto fail_io_unmap;
+	}
+
+	platform_set_drvdata(at91sam9g20ek_snd_device, &at91sam9g20ek_snd_devdata);
+	at91sam9g20ek_snd_devdata.dev = &at91sam9g20ek_snd_device->dev;
+
+	ret = platform_device_add(at91sam9g20ek_snd_device);
+	if (ret) {
+		DBG("platform device add failed\n");
+		platform_device_put(at91sam9g20ek_snd_device);
+		goto fail_io_unmap;
+	}
+
+	at91_set_A_periph(AT91_PIN_PB16, 0);	/* TK0 */
+	at91_set_A_periph(AT91_PIN_PB17, 0);	/* TF0 */
+	at91_set_A_periph(AT91_PIN_PB18, 0);	/* TD0 */
+#if 0	/* Bidirectional support not available on the SAM9G20EK */
+	at91_set_A_periph(AT91_PIN_PB19, 0);	/* RD0 */
+	at91_set_A_periph(AT91_PIN_PB20, 0);	/* RK0 */
+	at91_set_A_periph(AT91_PIN_PB21, 0);	/* RF0 */
+#endif
+	/*
+	 * Set PCK1 parent to PLLB and its rate to 12 Mhz.
+	 */
+	pllb_clk = clk_get(NULL, "pllb");
+	pck1_clk = clk_get(NULL, "pck1");
+
+	clk_set_parent(pck1_clk, pllb_clk);
+	clk_set_rate(pck1_clk, 12000000);
+
+	DBG("MCLK rate %luHz\n", clk_get_rate(pck1_clk));
+
+	/* assign the GPIO pin to PCK1 */
+	at91_set_B_periph(AT91_PIN_PC1, 0);
+
+#ifdef CONFIG_SND_AT91_SOC_AT91SAM9G20EK_SLAVE
+	printk(KERN_INFO "at91sam9g20ek_wm8731: Codec in Slave Mode\n");
+#else
+	printk(KERN_INFO "at91sam9g20ek_wm8731: Codec in Master Mode\n");
+#endif
+	return ret;
+
+fail_io_unmap:
+	iounmap(ssc->base);
+fail_release_mem:
+	release_mem_region(AT91SAM9G20_BASE_SSC, SZ_16K);
+	return ret;
+}
+
+static void __exit at91sam9g20ek_exit(void)
+{
+	struct at91_ssc_periph *ssc = at91sam9g20ek_dai.cpu_dai->private_data;
+
+	clk_put(pck1_clk);
+	clk_put(pllb_clk);
+
+	platform_device_unregister(at91sam9g20ek_snd_device);
+
+	iounmap(ssc->base);
+	release_mem_region(AT91SAM9G20_BASE_SSC, SZ_16K);
+}
+
+module_init(at91sam9g20ek_init);
+module_exit(at91sam9g20ek_exit);
+
+/* Module information */
+MODULE_AUTHOR("Ulf Samuelsson <ulf.samuelsson@atmel.com>");
+MODULE_DESCRIPTION("ALSA SoC AT91SAM9G20EK-WM8731");
+MODULE_LICENSE("GPL");
diff -urN linux-2.6.28-rc6/sound/soc/at91/Kconfig linux-2.6.28-rc6-0rig/sound/soc/at91/Kconfig
--- linux-2.6.28-rc6/sound/soc/at91/Kconfig	2008-10-10 00:13:53.000000000 +0200
+++ linux-2.6.28-rc6-0rig/sound/soc/at91/Kconfig	2008-11-29 20:39:30.000000000 +0100
@@ -25,3 +25,20 @@
 	help
 	  Say Y if you want to run with the AT91 SSC generating the BCLK
 	  and LRC signals on Endrelia boards.
+
+config SND_AT91_SOC_AT91SAM9G20EK_WM8731
+	tristate "SoC Audio support for WM8731-based Atmel AT91SAM9G20EK boards"
+	depends on SND_AT91_SOC && (MACH_AT91SAM9G20EK)
+	select SND_AT91_SOC_SSC
+	select SND_SOC_WM8731
+	help
+	  Say Y if you want to add support for SoC audio on WM8731-based
+	  Atmel AT91SAM9G20EK boards.
+
+config SND_AT91_SOC_AT91SAM9G20EK_SLAVE
+	bool "Run codec in slave Mode on the AT91SAM92G20EK board"
+	depends on SND_AT91_SOC_AT91SAM9G20EK_WM8731
+	default n
+	help
+	  Say Y if you want to run with the AT91 SSC generating the BCLK
+	  and LRC signals on Atmel boards.
diff -urN linux-2.6.28-rc6/sound/soc/at91/Makefile linux-2.6.28-rc6-0rig/sound/soc/at91/Makefile
--- linux-2.6.28-rc6/sound/soc/at91/Makefile	2008-10-10 00:13:53.000000000 +0200
+++ linux-2.6.28-rc6-0rig/sound/soc/at91/Makefile	2008-11-29 20:39:35.000000000 +0100
@@ -7,5 +7,8 @@
 
 # AT91 Machine Support
 snd-soc-eti-b1-wm8731-objs := eti_b1_wm8731.o
+snd-soc-at91sam9g20ek-wm8731-objs := at91sam9g20ek_wm8731.o
 
 obj-$(CONFIG_SND_AT91_SOC_ETI_B1_WM8731) += snd-soc-eti-b1-wm8731.o
+obj-$(CONFIG_SND_AT91_SOC_AT91SAM9G20_WM8731) += snd-soc-at91sam9g20ek-wm8731.o
+