ASoC: add support for the sh7722 Migo-R board

Add support for audio on sh7722-based Migo-R boards, using SIU and wm8978
codec, recording via external microphone and playback via headphones are
implemented.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

3 files changed, 232 insertions, 0 deletions

diff --git a/sound/soc/sh/Kconfig b/sound/soc/sh/Kconfig
index 3f1cd5503342..a86696bbe179 100644
--- a/sound/soc/sh/Kconfig
+++ b/sound/soc/sh/Kconfig
@@ -61,4 +61,12 @@ config SND_FSI_DA7210
           This option enables generic sound support for the
           FSI - DA7210 unit
 
+config SND_SIU_MIGOR
+        tristate "SIU sound support on Migo-R"
+        depends on SH_MIGOR
+        select SND_SOC_SH4_SIU
+        select SND_SOC_WM8978
+        help
+          This option enables sound support for the SH7722 Migo-R board
+
 endmenu
diff --git a/sound/soc/sh/Makefile b/sound/soc/sh/Makefile
index 5a97d2539d84..8a5a19293bda 100644
--- a/sound/soc/sh/Makefile
+++ b/sound/soc/sh/Makefile
@@ -16,7 +16,9 @@ obj-$(CONFIG_SND_SOC_SH4_SIU)	+= snd-soc-siu.o
 snd-soc-sh7760-ac97-objs        := sh7760-ac97.o
 snd-soc-fsi-ak4642-objs         := fsi-ak4642.o
 snd-soc-fsi-da7210-objs         := fsi-da7210.o
+snd-soc-migor-objs              := migor.o
 
 obj-$(CONFIG_SND_SH7760_AC97)   += snd-soc-sh7760-ac97.o
 obj-$(CONFIG_SND_FSI_AK4642)    += snd-soc-fsi-ak4642.o
 obj-$(CONFIG_SND_FSI_DA7210)    += snd-soc-fsi-da7210.o
+obj-$(CONFIG_SND_SIU_MIGOR)     += snd-soc-migor.o
diff --git a/sound/soc/sh/migor.c b/sound/soc/sh/migor.c
new file mode 100644
index 000000000000..3ccd9b393312
--- /dev/null
+++ b/sound/soc/sh/migor.c
@@ -0,0 +1,222 @@
+/*
+ * ALSA SoC driver for Migo-R
+ *
+ * Copyright (C) 2009-2010 Guennadi Liakhovetski <g.liakhovetski@gmx.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/device.h>
+#include <linux/firmware.h>
+#include <linux/module.h>
+
+#include <asm/clock.h>
+
+#include <cpu/sh7722.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/soc.h>
+#include <sound/soc-dapm.h>
+
+#include "../codecs/wm8978.h"
+#include "siu.h"
+
+/* Default 8000Hz sampling frequency */
+static unsigned long codec_freq = 8000 * 512;
+
+static unsigned int use_count;
+
+/* External clock, sourced from the codec at the SIUMCKB pin */
+static unsigned long siumckb_recalc(struct clk *clk)
+{
+        return codec_freq;
+}
+
+static struct clk_ops siumckb_clk_ops = {
+        .recalc = siumckb_recalc,
+};
+
+static struct clk siumckb_clk = {
+        .name           = "siumckb_clk",
+        .id             = -1,
+        .ops            = &siumckb_clk_ops,
+        .rate           = 0, /* initialised at run-time */
+};
+
+static int migor_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;
+        int ret;
+        unsigned int rate = params_rate(params);
+
+        ret = snd_soc_dai_set_sysclk(codec_dai, WM8978_PLL, 13000000,
+                                     SND_SOC_CLOCK_IN);
+        if (ret < 0)
+                return ret;
+
+        ret = snd_soc_dai_set_clkdiv(codec_dai, WM8978_DACCLK, 8);
+        if (ret < 0)
+                return ret;
+
+        ret = snd_soc_dai_set_clkdiv(codec_dai, WM8978_OPCLKRATE, rate * 512);
+        if (ret < 0)
+                return ret;
+
+        ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_NB_IF |
+                                  SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBS_CFS);
+        if (ret < 0)
+                return ret;
+
+        ret = snd_soc_dai_set_fmt(rtd->dai->cpu_dai, SND_SOC_DAIFMT_NB_IF |
+                                  SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBS_CFS);
+        if (ret < 0)
+                return ret;
+
+        codec_freq = rate * 512;
+        /*
+         * This propagates the parent frequency change to children and
+         * recalculates the frequency table
+         */
+        clk_set_rate(&siumckb_clk, codec_freq);
+        dev_dbg(codec_dai->dev, "%s: configure %luHz\n", __func__, codec_freq);
+
+        ret = snd_soc_dai_set_sysclk(rtd->dai->cpu_dai, SIU_CLKB_EXT,
+                                     codec_freq / 2, SND_SOC_CLOCK_IN);
+
+        if (!ret)
+                use_count++;
+
+        return ret;
+}
+
+static int migor_hw_free(struct snd_pcm_substream *substream)
+{
+        struct snd_soc_pcm_runtime *rtd = substream->private_data;
+        struct snd_soc_dai *codec_dai = rtd->dai->codec_dai;
+
+        if (use_count) {
+                use_count--;
+
+                if (!use_count)
+                        snd_soc_dai_set_sysclk(codec_dai, WM8978_PLL, 0,
+                                               SND_SOC_CLOCK_IN);
+        } else {
+                dev_dbg(codec_dai->dev, "Unbalanced hw_free!\n");
+        }
+
+        return 0;
+}
+
+static struct snd_soc_ops migor_dai_ops = {
+        .hw_params = migor_hw_params,
+        .hw_free = migor_hw_free,
+};
+
+static const struct snd_soc_dapm_widget migor_dapm_widgets[] = {
+        SND_SOC_DAPM_HP("Headphone", NULL),
+        SND_SOC_DAPM_MIC("Onboard Microphone", NULL),
+        SND_SOC_DAPM_MIC("External Microphone", NULL),
+};
+
+static const struct snd_soc_dapm_route audio_map[] = {
+        /* Headphone output connected to LHP/RHP, enable OUT4 for VMID */
+        { "Headphone", NULL,  "OUT4 VMID" },
+        { "OUT4 VMID", NULL,  "LHP" },
+        { "OUT4 VMID", NULL,  "RHP" },
+
+        /* On-board microphone */
+        { "RMICN", NULL, "Mic Bias" },
+        { "RMICP", NULL, "Mic Bias" },
+        { "Mic Bias", NULL, "Onboard Microphone" },
+
+        /* External microphone */
+        { "LMICN", NULL, "Mic Bias" },
+        { "LMICP", NULL, "Mic Bias" },
+        { "Mic Bias", NULL, "External Microphone" },
+};
+
+static int migor_dai_init(struct snd_soc_codec *codec)
+{
+        snd_soc_dapm_new_controls(codec, migor_dapm_widgets,
+                                  ARRAY_SIZE(migor_dapm_widgets));
+
+        snd_soc_dapm_add_routes(codec, audio_map, ARRAY_SIZE(audio_map));
+
+        return 0;
+}
+
+/* migor digital audio interface glue - connects codec <--> CPU */
+static struct snd_soc_dai_link migor_dai = {
+        .name = "wm8978",
+        .stream_name = "WM8978",
+        .cpu_dai = &siu_i2s_dai,
+        .codec_dai = &wm8978_dai,
+        .ops = &migor_dai_ops,
+        .init = migor_dai_init,
+};
+
+/* migor audio machine driver */
+static struct snd_soc_card snd_soc_migor = {
+        .name = "Migo-R",
+        .platform = &siu_platform,
+        .dai_link = &migor_dai,
+        .num_links = 1,
+};
+
+/* migor audio subsystem */
+static struct snd_soc_device migor_snd_devdata = {
+        .card = &snd_soc_migor,
+        .codec_dev = &soc_codec_dev_wm8978,
+};
+
+static struct platform_device *migor_snd_device;
+
+static int __init migor_init(void)
+{
+        int ret;
+
+        ret = clk_register(&siumckb_clk);
+        if (ret < 0)
+                return ret;
+
+        /* Port number used on this machine: port B */
+        migor_snd_device = platform_device_alloc("soc-audio", 1);
+        if (!migor_snd_device) {
+                ret = -ENOMEM;
+                goto epdevalloc;
+        }
+
+        platform_set_drvdata(migor_snd_device, &migor_snd_devdata);
+
+        migor_snd_devdata.dev = &migor_snd_device->dev;
+
+        ret = platform_device_add(migor_snd_device);
+        if (ret)
+                goto epdevadd;
+
+        return 0;
+
+epdevadd:
+        platform_device_put(migor_snd_device);
+epdevalloc:
+        clk_unregister(&siumckb_clk);
+        return ret;
+}
+
+static void __exit migor_exit(void)
+{
+        clk_unregister(&siumckb_clk);
+        platform_device_unregister(migor_snd_device);
+}
+
+module_init(migor_init);
+module_exit(migor_exit);
+
+MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
+MODULE_DESCRIPTION("ALSA SoC Migor");
+MODULE_LICENSE("GPL v2");