ASoC: img: Add driver for SPDIF input controller

Add driver for Imagination Technologies SDPIF input
controller

Signed-off-by: Damien.Horsley <Damien.Horsley@imgtec.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

3 files changed, 815 insertions, 0 deletions

diff --git a/sound/soc/img/Kconfig b/sound/soc/img/Kconfig
index 3bb507e5570c..161ce90441b7 100644
--- a/sound/soc/img/Kconfig
+++ b/sound/soc/img/Kconfig
@@ -26,3 +26,11 @@ config SND_SOC_IMG_PARALLEL_OUT
 	help
 	  Say Y or M if you want to add support for parallel out driver for
 	  Imagination Technologies parallel out device.
+
+config SND_SOC_IMG_SPDIF_IN
+	tristate "Imagination SPDIF Input Device Driver"
+	depends on SND_SOC_IMG
+	select SND_SOC_GENERIC_DMAENGINE_PCM
+	help
+	  Say Y or M if you want to add support for SPDIF input driver for
+	  Imagination Technologies SPDIF input device.
diff --git a/sound/soc/img/Makefile b/sound/soc/img/Makefile
index da8976322488..85ded5eede5f 100644
--- a/sound/soc/img/Makefile
+++ b/sound/soc/img/Makefile
@@ -1,3 +1,4 @@
 obj-$(CONFIG_SND_SOC_IMG_I2S_IN) += img-i2s-in.o
 obj-$(CONFIG_SND_SOC_IMG_I2S_OUT) += img-i2s-out.o
 obj-$(CONFIG_SND_SOC_IMG_PARALLEL_OUT) += img-parallel-out.o
+obj-$(CONFIG_SND_SOC_IMG_SPDIF_IN) += img-spdif-in.o
diff --git a/sound/soc/img/img-spdif-in.c b/sound/soc/img/img-spdif-in.c
new file mode 100644
index 000000000000..4d9953d318af
--- /dev/null
+++ b/sound/soc/img/img-spdif-in.c
@@ -0,0 +1,806 @@
+/*
+ * IMG SPDIF input controller driver
+ *
+ * Copyright (C) 2015 Imagination Technologies Ltd.
+ *
+ * Author: Damien Horsley <Damien.Horsley@imgtec.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ */
+
+#include <linux/clk.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/reset.h>
+
+#include <sound/core.h>
+#include <sound/dmaengine_pcm.h>
+#include <sound/initval.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+
+#define IMG_SPDIF_IN_RX_FIFO_OFFSET		0
+
+#define IMG_SPDIF_IN_CTL			0x4
+#define IMG_SPDIF_IN_CTL_LOCKLO_MASK		0xff
+#define IMG_SPDIF_IN_CTL_LOCKLO_SHIFT		0
+#define IMG_SPDIF_IN_CTL_LOCKHI_MASK		0xff00
+#define IMG_SPDIF_IN_CTL_LOCKHI_SHIFT		8
+#define IMG_SPDIF_IN_CTL_TRK_MASK		0xff0000
+#define IMG_SPDIF_IN_CTL_TRK_SHIFT		16
+#define IMG_SPDIF_IN_CTL_SRD_MASK		0x70000000
+#define IMG_SPDIF_IN_CTL_SRD_SHIFT		28
+#define IMG_SPDIF_IN_CTL_SRT_MASK		BIT(31)
+
+#define IMG_SPDIF_IN_STATUS			0x8
+#define IMG_SPDIF_IN_STATUS_SAM_MASK		0x7000
+#define IMG_SPDIF_IN_STATUS_SAM_SHIFT		12
+#define IMG_SPDIF_IN_STATUS_LOCK_MASK		BIT(15)
+#define IMG_SPDIF_IN_STATUS_LOCK_SHIFT		15
+
+#define IMG_SPDIF_IN_CLKGEN			0x1c
+#define IMG_SPDIF_IN_CLKGEN_NOM_MASK		0x3ff
+#define IMG_SPDIF_IN_CLKGEN_NOM_SHIFT		0
+#define IMG_SPDIF_IN_CLKGEN_HLD_MASK		0x3ff0000
+#define IMG_SPDIF_IN_CLKGEN_HLD_SHIFT		16
+
+#define IMG_SPDIF_IN_CSL			0x20
+
+#define IMG_SPDIF_IN_CSH			0x24
+#define IMG_SPDIF_IN_CSH_MASK			0xff
+#define IMG_SPDIF_IN_CSH_SHIFT			0
+
+#define IMG_SPDIF_IN_SOFT_RESET			0x28
+#define IMG_SPDIF_IN_SOFT_RESET_MASK		BIT(0)
+
+#define IMG_SPDIF_IN_ACLKGEN_START		0x2c
+#define IMG_SPDIF_IN_ACLKGEN_NOM_MASK		0x3ff
+#define IMG_SPDIF_IN_ACLKGEN_NOM_SHIFT		0
+#define IMG_SPDIF_IN_ACLKGEN_HLD_MASK		0xffc00
+#define IMG_SPDIF_IN_ACLKGEN_HLD_SHIFT		10
+#define IMG_SPDIF_IN_ACLKGEN_TRK_MASK		0xff00000
+#define IMG_SPDIF_IN_ACLKGEN_TRK_SHIFT		20
+
+#define IMG_SPDIF_IN_NUM_ACLKGEN		4
+
+struct img_spdif_in {
+	spinlock_t lock;
+	void __iomem *base;
+	struct clk *clk_sys;
+	struct snd_dmaengine_dai_dma_data dma_data;
+	struct device *dev;
+	unsigned int trk;
+	bool multi_freq;
+	int lock_acquire;
+	int lock_release;
+	unsigned int single_freq;
+	unsigned int multi_freqs[IMG_SPDIF_IN_NUM_ACLKGEN];
+	bool active;
+
+	/* Write-only registers */
+	unsigned int aclkgen_regs[IMG_SPDIF_IN_NUM_ACLKGEN];
+};
+
+static inline void img_spdif_in_writel(struct img_spdif_in *spdif,
+					u32 val, u32 reg)
+{
+	writel(val, spdif->base + reg);
+}
+
+static inline u32 img_spdif_in_readl(struct img_spdif_in *spdif, u32 reg)
+{
+	return readl(spdif->base + reg);
+}
+
+static inline void img_spdif_in_aclkgen_writel(struct img_spdif_in *spdif,
+						u32 index)
+{
+	img_spdif_in_writel(spdif, spdif->aclkgen_regs[index],
+			IMG_SPDIF_IN_ACLKGEN_START + (index * 0x4));
+}
+
+static int img_spdif_in_check_max_rate(struct img_spdif_in *spdif,
+		unsigned int sample_rate, unsigned long *actual_freq)
+{
+	unsigned long min_freq, freq_t;
+
+	/* Clock rate must be at least 24x the bit rate */
+	min_freq = sample_rate * 2 * 32 * 24;
+
+	freq_t = clk_get_rate(spdif->clk_sys);
+
+	if (freq_t < min_freq)
+		return -EINVAL;
+
+	*actual_freq = freq_t;
+
+	return 0;
+}
+
+static int img_spdif_in_do_clkgen_calc(unsigned int rate, unsigned int *pnom,
+		unsigned int *phld, unsigned long clk_rate)
+{
+	unsigned int ori, nom, hld;
+
+	/*
+	 * Calculate oversampling ratio, nominal phase increment and hold
+	 * increment for the given rate / frequency
+	 */
+
+	if (!rate)
+		return -EINVAL;
+
+	ori = clk_rate / (rate * 64);
+
+	if (!ori)
+		return -EINVAL;
+
+	nom = (4096 / ori) + 1;
+	do
+		hld = 4096 - (--nom * (ori - 1));
+	while (hld < 120);
+
+	*pnom = nom;
+	*phld = hld;
+
+	return 0;
+}
+
+static int img_spdif_in_do_clkgen_single(struct img_spdif_in *spdif,
+		unsigned int rate)
+{
+	unsigned int nom, hld;
+	unsigned long flags, clk_rate;
+	int ret = 0;
+	u32 reg;
+
+	ret = img_spdif_in_check_max_rate(spdif, rate, &clk_rate);
+	if (ret)
+		return ret;
+
+	ret = img_spdif_in_do_clkgen_calc(rate, &nom, &hld, clk_rate);
+	if (ret)
+		return ret;
+
+	reg = (nom << IMG_SPDIF_IN_CLKGEN_NOM_SHIFT) &
+		IMG_SPDIF_IN_CLKGEN_NOM_MASK;
+	reg |= (hld << IMG_SPDIF_IN_CLKGEN_HLD_SHIFT) &
+		IMG_SPDIF_IN_CLKGEN_HLD_MASK;
+
+	spin_lock_irqsave(&spdif->lock, flags);
+
+	if (spdif->active) {
+		spin_unlock_irqrestore(&spdif->lock, flags);
+		return -EBUSY;
+	}
+
+	img_spdif_in_writel(spdif, reg, IMG_SPDIF_IN_CLKGEN);
+
+	spdif->single_freq = rate;
+
+	spin_unlock_irqrestore(&spdif->lock, flags);
+
+	return 0;
+}
+
+static int img_spdif_in_do_clkgen_multi(struct img_spdif_in *spdif,
+		unsigned int multi_freqs[])
+{
+	unsigned int nom, hld, rate, max_rate = 0;
+	unsigned long flags, clk_rate;
+	int i, ret = 0;
+	u32 reg, trk_reg, temp_regs[IMG_SPDIF_IN_NUM_ACLKGEN];
+
+	for (i = 0; i < IMG_SPDIF_IN_NUM_ACLKGEN; i++)
+		if (multi_freqs[i] > max_rate)
+			max_rate = multi_freqs[i];
+
+	ret = img_spdif_in_check_max_rate(spdif, max_rate, &clk_rate);
+	if (ret)
+		return ret;
+
+	for (i = 0; i < IMG_SPDIF_IN_NUM_ACLKGEN; i++) {
+		rate = multi_freqs[i];
+
+		ret = img_spdif_in_do_clkgen_calc(rate, &nom, &hld, clk_rate);
+		if (ret)
+			return ret;
+
+		reg = (nom << IMG_SPDIF_IN_ACLKGEN_NOM_SHIFT) &
+			IMG_SPDIF_IN_ACLKGEN_NOM_MASK;
+		reg |= (hld << IMG_SPDIF_IN_ACLKGEN_HLD_SHIFT) &
+			IMG_SPDIF_IN_ACLKGEN_HLD_MASK;
+		temp_regs[i] = reg;
+	}
+
+	spin_lock_irqsave(&spdif->lock, flags);
+
+	if (spdif->active) {
+		spin_unlock_irqrestore(&spdif->lock, flags);
+		return -EBUSY;
+	}
+
+	trk_reg = spdif->trk << IMG_SPDIF_IN_ACLKGEN_TRK_SHIFT;
+
+	for (i = 0; i < IMG_SPDIF_IN_NUM_ACLKGEN; i++) {
+		spdif->aclkgen_regs[i] = temp_regs[i] | trk_reg;
+		img_spdif_in_aclkgen_writel(spdif, i);
+	}
+
+	spdif->multi_freq = true;
+	spdif->multi_freqs[0] = multi_freqs[0];
+	spdif->multi_freqs[1] = multi_freqs[1];
+	spdif->multi_freqs[2] = multi_freqs[2];
+	spdif->multi_freqs[3] = multi_freqs[3];
+
+	spin_unlock_irqrestore(&spdif->lock, flags);
+
+	return 0;
+}
+
+static int img_spdif_in_iec958_info(struct snd_kcontrol *kcontrol,
+		struct snd_ctl_elem_info *uinfo)
+{
+	uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
+	uinfo->count = 1;
+
+	return 0;
+}
+
+static int img_spdif_in_get_status_mask(struct snd_kcontrol *kcontrol,
+				       struct snd_ctl_elem_value *ucontrol)
+{
+	ucontrol->value.iec958.status[0] = 0xff;
+	ucontrol->value.iec958.status[1] = 0xff;
+	ucontrol->value.iec958.status[2] = 0xff;
+	ucontrol->value.iec958.status[3] = 0xff;
+	ucontrol->value.iec958.status[4] = 0xff;
+
+	return 0;
+}
+
+static int img_spdif_in_get_status(struct snd_kcontrol *kcontrol,
+				  struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
+	struct img_spdif_in *spdif = snd_soc_dai_get_drvdata(cpu_dai);
+	u32 reg;
+
+	reg = img_spdif_in_readl(spdif, IMG_SPDIF_IN_CSL);
+	ucontrol->value.iec958.status[0] = reg & 0xff;
+	ucontrol->value.iec958.status[1] = (reg >> 8) & 0xff;
+	ucontrol->value.iec958.status[2] = (reg >> 16) & 0xff;
+	ucontrol->value.iec958.status[3] = (reg >> 24) & 0xff;
+	reg = img_spdif_in_readl(spdif, IMG_SPDIF_IN_CSH);
+	ucontrol->value.iec958.status[4] = (reg & IMG_SPDIF_IN_CSH_MASK)
+		>> IMG_SPDIF_IN_CSH_SHIFT;
+
+	return 0;
+}
+
+static int img_spdif_in_info_multi_freq(struct snd_kcontrol *kcontrol,
+		struct snd_ctl_elem_info *uinfo)
+{
+	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
+	uinfo->count = IMG_SPDIF_IN_NUM_ACLKGEN;
+	uinfo->value.integer.min = 0;
+	uinfo->value.integer.max = LONG_MAX;
+
+	return 0;
+}
+
+static int img_spdif_in_get_multi_freq(struct snd_kcontrol *kcontrol,
+				  struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
+	struct img_spdif_in *spdif = snd_soc_dai_get_drvdata(cpu_dai);
+	unsigned long flags;
+
+	spin_lock_irqsave(&spdif->lock, flags);
+	if (spdif->multi_freq) {
+		ucontrol->value.integer.value[0] = spdif->multi_freqs[0];
+		ucontrol->value.integer.value[1] = spdif->multi_freqs[1];
+		ucontrol->value.integer.value[2] = spdif->multi_freqs[2];
+		ucontrol->value.integer.value[3] = spdif->multi_freqs[3];
+	} else {
+		ucontrol->value.integer.value[0] = 0;
+		ucontrol->value.integer.value[1] = 0;
+		ucontrol->value.integer.value[2] = 0;
+		ucontrol->value.integer.value[3] = 0;
+	}
+	spin_unlock_irqrestore(&spdif->lock, flags);
+
+	return 0;
+}
+
+static int img_spdif_in_set_multi_freq(struct snd_kcontrol *kcontrol,
+				  struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
+	struct img_spdif_in *spdif = snd_soc_dai_get_drvdata(cpu_dai);
+	unsigned int multi_freqs[IMG_SPDIF_IN_NUM_ACLKGEN];
+	bool multi_freq;
+	unsigned long flags;
+
+	if ((ucontrol->value.integer.value[0] == 0) &&
+			(ucontrol->value.integer.value[1] == 0) &&
+			(ucontrol->value.integer.value[2] == 0) &&
+			(ucontrol->value.integer.value[3] == 0)) {
+		multi_freq = false;
+	} else {
+		multi_freqs[0] = ucontrol->value.integer.value[0];
+		multi_freqs[1] = ucontrol->value.integer.value[1];
+		multi_freqs[2] = ucontrol->value.integer.value[2];
+		multi_freqs[3] = ucontrol->value.integer.value[3];
+		multi_freq = true;
+	}
+
+	if (multi_freq)
+		return img_spdif_in_do_clkgen_multi(spdif, multi_freqs);
+
+	spin_lock_irqsave(&spdif->lock, flags);
+
+	if (spdif->active) {
+		spin_unlock_irqrestore(&spdif->lock, flags);
+		return -EBUSY;
+	}
+
+	spdif->multi_freq = false;
+
+	spin_unlock_irqrestore(&spdif->lock, flags);
+
+	return 0;
+}
+
+static int img_spdif_in_info_lock_freq(struct snd_kcontrol *kcontrol,
+		struct snd_ctl_elem_info *uinfo)
+{
+	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
+	uinfo->count = 1;
+	uinfo->value.integer.min = 0;
+	uinfo->value.integer.max = LONG_MAX;
+
+	return 0;
+}
+
+static int img_spdif_in_get_lock_freq(struct snd_kcontrol *kcontrol,
+				  struct snd_ctl_elem_value *uc)
+{
+	struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
+	struct img_spdif_in *spdif = snd_soc_dai_get_drvdata(cpu_dai);
+	u32 reg;
+	int i;
+	unsigned long flags;
+
+	spin_lock_irqsave(&spdif->lock, flags);
+
+	reg = img_spdif_in_readl(spdif, IMG_SPDIF_IN_STATUS);
+	if (reg & IMG_SPDIF_IN_STATUS_LOCK_MASK) {
+		if (spdif->multi_freq) {
+			i = ((reg & IMG_SPDIF_IN_STATUS_SAM_MASK) >>
+					IMG_SPDIF_IN_STATUS_SAM_SHIFT) - 1;
+			uc->value.integer.value[0] = spdif->multi_freqs[i];
+		} else {
+			uc->value.integer.value[0] = spdif->single_freq;
+		}
+	} else {
+		uc->value.integer.value[0] = 0;
+	}
+
+	spin_unlock_irqrestore(&spdif->lock, flags);
+
+	return 0;
+}
+
+static int img_spdif_in_info_trk(struct snd_kcontrol *kcontrol,
+		struct snd_ctl_elem_info *uinfo)
+{
+	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
+	uinfo->count = 1;
+	uinfo->value.integer.min = 0;
+	uinfo->value.integer.max = 255;
+
+	return 0;
+}
+
+static int img_spdif_in_get_trk(struct snd_kcontrol *kcontrol,
+				  struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
+	struct img_spdif_in *spdif = snd_soc_dai_get_drvdata(cpu_dai);
+
+	ucontrol->value.integer.value[0] = spdif->trk;
+
+	return 0;
+}
+
+static int img_spdif_in_set_trk(struct snd_kcontrol *kcontrol,
+				  struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
+	struct img_spdif_in *spdif = snd_soc_dai_get_drvdata(cpu_dai);
+	unsigned long flags;
+	int i;
+	u32 reg;
+
+	spin_lock_irqsave(&spdif->lock, flags);
+
+	if (spdif->active) {
+		spin_unlock_irqrestore(&spdif->lock, flags);
+		return -EBUSY;
+	}
+
+	spdif->trk = ucontrol->value.integer.value[0];
+
+	reg = img_spdif_in_readl(spdif, IMG_SPDIF_IN_CTL);
+	reg &= ~IMG_SPDIF_IN_CTL_TRK_MASK;
+	reg |= spdif->trk << IMG_SPDIF_IN_CTL_TRK_SHIFT;
+	img_spdif_in_writel(spdif, reg, IMG_SPDIF_IN_CTL);
+
+	for (i = 0; i < IMG_SPDIF_IN_NUM_ACLKGEN; i++) {
+		spdif->aclkgen_regs[i] = (spdif->aclkgen_regs[i] &
+			~IMG_SPDIF_IN_ACLKGEN_TRK_MASK) |
+			(spdif->trk << IMG_SPDIF_IN_ACLKGEN_TRK_SHIFT);
+
+		img_spdif_in_aclkgen_writel(spdif, i);
+	}
+
+	spin_unlock_irqrestore(&spdif->lock, flags);
+
+	return 0;
+}
+
+static int img_spdif_in_info_lock(struct snd_kcontrol *kcontrol,
+		struct snd_ctl_elem_info *uinfo)
+{
+	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
+	uinfo->count = 1;
+	uinfo->value.integer.min = -128;
+	uinfo->value.integer.max = 127;
+
+	return 0;
+}
+
+static int img_spdif_in_get_lock_acquire(struct snd_kcontrol *kcontrol,
+				  struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
+	struct img_spdif_in *spdif = snd_soc_dai_get_drvdata(cpu_dai);
+
+	ucontrol->value.integer.value[0] = spdif->lock_acquire;
+
+	return 0;
+}
+
+static int img_spdif_in_set_lock_acquire(struct snd_kcontrol *kcontrol,
+				  struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
+	struct img_spdif_in *spdif = snd_soc_dai_get_drvdata(cpu_dai);
+	unsigned long flags;
+	u32 reg;
+
+	spin_lock_irqsave(&spdif->lock, flags);
+
+	if (spdif->active) {
+		spin_unlock_irqrestore(&spdif->lock, flags);
+		return -EBUSY;
+	}
+
+	spdif->lock_acquire = ucontrol->value.integer.value[0];
+
+	reg = img_spdif_in_readl(spdif, IMG_SPDIF_IN_CTL);
+	reg &= ~IMG_SPDIF_IN_CTL_LOCKHI_MASK;
+	reg |= (spdif->lock_acquire << IMG_SPDIF_IN_CTL_LOCKHI_SHIFT) &
+		IMG_SPDIF_IN_CTL_LOCKHI_MASK;
+	img_spdif_in_writel(spdif, reg, IMG_SPDIF_IN_CTL);
+
+	spin_unlock_irqrestore(&spdif->lock, flags);
+
+	return 0;
+}
+
+static int img_spdif_in_get_lock_release(struct snd_kcontrol *kcontrol,
+				  struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
+	struct img_spdif_in *spdif = snd_soc_dai_get_drvdata(cpu_dai);
+
+	ucontrol->value.integer.value[0] = spdif->lock_release;
+
+	return 0;
+}
+
+static int img_spdif_in_set_lock_release(struct snd_kcontrol *kcontrol,
+				  struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
+	struct img_spdif_in *spdif = snd_soc_dai_get_drvdata(cpu_dai);
+	unsigned long flags;
+	u32 reg;
+
+	spin_lock_irqsave(&spdif->lock, flags);
+
+	if (spdif->active) {
+		spin_unlock_irqrestore(&spdif->lock, flags);
+		return -EBUSY;
+	}
+
+	spdif->lock_release = ucontrol->value.integer.value[0];
+
+	reg = img_spdif_in_readl(spdif, IMG_SPDIF_IN_CTL);
+	reg &= ~IMG_SPDIF_IN_CTL_LOCKLO_MASK;
+	reg |= (spdif->lock_release << IMG_SPDIF_IN_CTL_LOCKLO_SHIFT) &
+		IMG_SPDIF_IN_CTL_LOCKLO_MASK;
+	img_spdif_in_writel(spdif, reg, IMG_SPDIF_IN_CTL);
+
+	spin_unlock_irqrestore(&spdif->lock, flags);
+
+	return 0;
+}
+
+static struct snd_kcontrol_new img_spdif_in_controls[] = {
+	{
+		.access = SNDRV_CTL_ELEM_ACCESS_READ,
+		.iface = SNDRV_CTL_ELEM_IFACE_PCM,
+		.name = SNDRV_CTL_NAME_IEC958("", CAPTURE, MASK),
+		.info = img_spdif_in_iec958_info,
+		.get = img_spdif_in_get_status_mask
+	},
+	{
+		.access = SNDRV_CTL_ELEM_ACCESS_READ |
+			SNDRV_CTL_ELEM_ACCESS_VOLATILE,
+		.iface = SNDRV_CTL_ELEM_IFACE_PCM,
+		.name = SNDRV_CTL_NAME_IEC958("", CAPTURE, DEFAULT),
+		.info = img_spdif_in_iec958_info,
+		.get = img_spdif_in_get_status
+	},
+	{
+		.iface = SNDRV_CTL_ELEM_IFACE_PCM,
+		.name = "SPDIF In Multi Frequency Acquire",
+		.info = img_spdif_in_info_multi_freq,
+		.get = img_spdif_in_get_multi_freq,
+		.put = img_spdif_in_set_multi_freq
+	},
+	{
+		.access = SNDRV_CTL_ELEM_ACCESS_READ |
+			SNDRV_CTL_ELEM_ACCESS_VOLATILE,
+		.iface = SNDRV_CTL_ELEM_IFACE_PCM,
+		.name = "SPDIF In Lock Frequency",
+		.info = img_spdif_in_info_lock_freq,
+		.get = img_spdif_in_get_lock_freq
+	},
+	{
+		.iface = SNDRV_CTL_ELEM_IFACE_PCM,
+		.name = "SPDIF In Lock TRK",
+		.info = img_spdif_in_info_trk,
+		.get = img_spdif_in_get_trk,
+		.put = img_spdif_in_set_trk
+	},
+	{
+		.iface = SNDRV_CTL_ELEM_IFACE_PCM,
+		.name = "SPDIF In Lock Acquire Threshold",
+		.info = img_spdif_in_info_lock,
+		.get = img_spdif_in_get_lock_acquire,
+		.put = img_spdif_in_set_lock_acquire
+	},
+	{
+		.iface = SNDRV_CTL_ELEM_IFACE_PCM,
+		.name = "SPDIF In Lock Release Threshold",
+		.info = img_spdif_in_info_lock,
+		.get = img_spdif_in_get_lock_release,
+		.put = img_spdif_in_set_lock_release
+	}
+};
+
+static int img_spdif_in_trigger(struct snd_pcm_substream *substream, int cmd,
+	struct snd_soc_dai *dai)
+{
+	unsigned long flags;
+	struct img_spdif_in *spdif = snd_soc_dai_get_drvdata(dai);
+	int ret = 0;
+	u32 reg;
+
+	spin_lock_irqsave(&spdif->lock, flags);
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+	case SNDRV_PCM_TRIGGER_RESUME:
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+		reg = img_spdif_in_readl(spdif, IMG_SPDIF_IN_CTL);
+		if (spdif->multi_freq)
+			reg &= ~IMG_SPDIF_IN_CTL_SRD_MASK;
+		else
+			reg |= (1UL << IMG_SPDIF_IN_CTL_SRD_SHIFT);
+		reg |= IMG_SPDIF_IN_CTL_SRT_MASK;
+		img_spdif_in_writel(spdif, reg, IMG_SPDIF_IN_CTL);
+		spdif->active = true;
+		break;
+	case SNDRV_PCM_TRIGGER_STOP:
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+		reg = img_spdif_in_readl(spdif, IMG_SPDIF_IN_CTL);
+		reg &= ~IMG_SPDIF_IN_CTL_SRT_MASK;
+		img_spdif_in_writel(spdif, reg, IMG_SPDIF_IN_CTL);
+		spdif->active = false;
+		break;
+	default:
+		ret = -EINVAL;
+	}
+
+	spin_unlock_irqrestore(&spdif->lock, flags);
+
+	return ret;
+}
+
+static int img_spdif_in_hw_params(struct snd_pcm_substream *substream,
+	struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
+{
+	struct img_spdif_in *spdif = snd_soc_dai_get_drvdata(dai);
+	unsigned int rate, channels;
+	snd_pcm_format_t format;
+
+	rate = params_rate(params);
+	channels = params_channels(params);
+	format = params_format(params);
+
+	if (format != SNDRV_PCM_FORMAT_S32_LE)
+		return -EINVAL;
+
+	if (channels != 2)
+		return -EINVAL;
+
+	return img_spdif_in_do_clkgen_single(spdif, rate);
+}
+
+static const struct snd_soc_dai_ops img_spdif_in_dai_ops = {
+	.trigger = img_spdif_in_trigger,
+	.hw_params = img_spdif_in_hw_params
+};
+
+static int img_spdif_in_dai_probe(struct snd_soc_dai *dai)
+{
+	struct img_spdif_in *spdif = snd_soc_dai_get_drvdata(dai);
+
+	snd_soc_dai_init_dma_data(dai, NULL, &spdif->dma_data);
+
+	snd_soc_add_dai_controls(dai, img_spdif_in_controls,
+			ARRAY_SIZE(img_spdif_in_controls));
+
+	return 0;
+}
+
+static struct snd_soc_dai_driver img_spdif_in_dai = {
+	.probe = img_spdif_in_dai_probe,
+	.capture = {
+		.channels_min = 2,
+		.channels_max = 2,
+		.rates = SNDRV_PCM_RATE_8000_192000,
+		.formats = SNDRV_PCM_FMTBIT_S32_LE
+	},
+	.ops = &img_spdif_in_dai_ops
+};
+
+static const struct snd_soc_component_driver img_spdif_in_component = {
+	.name = "img-spdif-in"
+};
+
+static int img_spdif_in_probe(struct platform_device *pdev)
+{
+	struct img_spdif_in *spdif;
+	struct resource *res;
+	void __iomem *base;
+	int ret;
+	struct reset_control *rst;
+	u32 reg;
+	struct device *dev = &pdev->dev;
+
+	spdif = devm_kzalloc(&pdev->dev, sizeof(*spdif), GFP_KERNEL);
+	if (!spdif)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, spdif);
+
+	spdif->dev = &pdev->dev;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(base))
+		return PTR_ERR(base);
+
+	spdif->base = base;
+
+	spdif->clk_sys = devm_clk_get(dev, "sys");
+	if (IS_ERR(spdif->clk_sys)) {
+		if (PTR_ERR(spdif->clk_sys) != -EPROBE_DEFER)
+			dev_err(dev, "Failed to acquire clock 'sys'\n");
+		return PTR_ERR(spdif->clk_sys);
+	}
+
+	ret = clk_prepare_enable(spdif->clk_sys);
+	if (ret)
+		return ret;
+
+	rst = devm_reset_control_get(&pdev->dev, "rst");
+	if (IS_ERR(rst)) {
+		if (PTR_ERR(rst) == -EPROBE_DEFER) {
+			ret = -EPROBE_DEFER;
+			goto err_clk_disable;
+		}
+		dev_dbg(dev, "No top level reset found\n");
+		img_spdif_in_writel(spdif, IMG_SPDIF_IN_SOFT_RESET_MASK,
+				IMG_SPDIF_IN_SOFT_RESET);
+		img_spdif_in_writel(spdif, 0, IMG_SPDIF_IN_SOFT_RESET);
+	} else {
+		reset_control_assert(rst);
+		reset_control_deassert(rst);
+	}
+
+	spin_lock_init(&spdif->lock);
+
+	spdif->dma_data.addr = res->start + IMG_SPDIF_IN_RX_FIFO_OFFSET;
+	spdif->dma_data.addr_width = 4;
+	spdif->dma_data.maxburst = 4;
+	spdif->trk = 0x80;
+	spdif->lock_acquire = 4;
+	spdif->lock_release = -128;
+
+	reg = (spdif->lock_acquire << IMG_SPDIF_IN_CTL_LOCKHI_SHIFT) &
+		IMG_SPDIF_IN_CTL_LOCKHI_MASK;
+	reg |= (spdif->lock_release << IMG_SPDIF_IN_CTL_LOCKLO_SHIFT) &
+		IMG_SPDIF_IN_CTL_LOCKLO_MASK;
+	reg |= (spdif->trk << IMG_SPDIF_IN_CTL_TRK_SHIFT) &
+		IMG_SPDIF_IN_CTL_TRK_MASK;
+	img_spdif_in_writel(spdif, reg, IMG_SPDIF_IN_CTL);
+
+	ret = devm_snd_soc_register_component(&pdev->dev,
+			&img_spdif_in_component, &img_spdif_in_dai, 1);
+	if (ret)
+		goto err_clk_disable;
+
+	ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
+	if (ret)
+		goto err_clk_disable;
+
+	return 0;
+
+err_clk_disable:
+	clk_disable_unprepare(spdif->clk_sys);
+
+	return ret;
+}
+
+static int img_spdif_in_dev_remove(struct platform_device *pdev)
+{
+	struct img_spdif_in *spdif = platform_get_drvdata(pdev);
+
+	clk_disable_unprepare(spdif->clk_sys);
+
+	return 0;
+}
+
+static const struct of_device_id img_spdif_in_of_match[] = {
+	{ .compatible = "img,spdif-in" },
+	{}
+};
+MODULE_DEVICE_TABLE(of, img_spdif_in_of_match);
+
+static struct platform_driver img_spdif_in_driver = {
+	.driver = {
+		.name = "img-spdif-in",
+		.of_match_table = img_spdif_in_of_match
+	},
+	.probe = img_spdif_in_probe,
+	.remove = img_spdif_in_dev_remove
+};
+module_platform_driver(img_spdif_in_driver);
+
+MODULE_AUTHOR("Damien Horsley <Damien.Horsley@imgtec.com>");
+MODULE_DESCRIPTION("IMG SPDIF Input driver");
+MODULE_LICENSE("GPL v2");