ASoC: img: Add Imagination Technologies parallel output driver

Add a driver for the Imagination Technologies parallel output hardware

Change-Id: Ic7ad6553bc1ba9d67800865ba23f21565ce2966e
Signed-off-by: Damien Horsley <Damien.Horsley@imgtec.com>

3 files changed, 428 insertions, 0 deletions

diff --git a/sound/soc/img/Kconfig b/sound/soc/img/Kconfig
index 003baa60d24..0508b13a65f 100644
--- a/sound/soc/img/Kconfig
+++ b/sound/soc/img/Kconfig
@@ -19,3 +19,11 @@ config SND_SOC_IMG_I2S_OUT
 	help
 	  Say Y or M if you want to add support for I2S out driver for
 	  Imagination Technologies I2S out device.
+
+config SND_SOC_IMG_PARALLEL_OUT
+	tristate "Imagination Parallel Output 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 parallel out driver for
+	  Imagination Technologies parallel out device.
diff --git a/sound/soc/img/Makefile b/sound/soc/img/Makefile
index c41a4af8dd8..da897632248 100644
--- a/sound/soc/img/Makefile
+++ b/sound/soc/img/Makefile
@@ -1,2 +1,3 @@
 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
diff --git a/sound/soc/img/img-parallel-out.c b/sound/soc/img/img-parallel-out.c
new file mode 100644
index 00000000000..539de28117c
--- /dev/null
+++ b/sound/soc/img/img-parallel-out.c
@@ -0,0 +1,419 @@
+/*
+ * IMG parallel out controller driver
+ *
+ * Copyright (C) 2014 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/pm_runtime.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_PRL_OUT_TX_FIFO		0
+
+#define IMG_PRL_OUT_CTL			0x4
+#define IMG_PRL_OUT_CTL_CH_MASK		BIT(4)
+#define IMG_PRL_OUT_CTL_PACKH_MASK	BIT(3)
+#define IMG_PRL_OUT_CTL_EDGE_MASK	BIT(2)
+#define IMG_PRL_OUT_CTL_ME_MASK		BIT(1)
+#define IMG_PRL_OUT_CTL_SRST_MASK	BIT(0)
+
+struct img_prl_out {
+	spinlock_t lock;
+	void __iomem *base;
+	struct clk *clk_sys;
+	struct clk *clk_ref;
+	struct snd_dmaengine_dai_dma_data dma_data;
+	struct device *dev;
+	bool active;
+	struct reset_control *rst;
+};
+
+static int img_prl_out_suspend(struct device *dev)
+{
+	struct img_prl_out *prl = dev_get_drvdata(dev);
+
+	clk_disable_unprepare(prl->clk_ref);
+
+	return 0;
+}
+
+static int img_prl_out_resume(struct device *dev)
+{
+	struct img_prl_out *prl = dev_get_drvdata(dev);
+	int ret;
+
+	ret = clk_prepare_enable(prl->clk_ref);
+	if (ret) {
+		dev_err(dev, "clk_enable failed: %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static inline void img_prl_out_writel(struct img_prl_out *prl,
+				u32 val, u32 reg)
+{
+	writel(val, prl->base + reg);
+}
+
+static inline u32 img_prl_out_readl(struct img_prl_out *prl, u32 reg)
+{
+	return readl(prl->base + reg);
+}
+
+static void img_prl_out_reset(struct img_prl_out *prl)
+{
+	u32 ctl_reg;
+
+	ctl_reg = img_prl_out_readl(prl, IMG_PRL_OUT_CTL) &
+			~IMG_PRL_OUT_CTL_ME_MASK;
+
+	reset_control_assert(prl->rst);
+	reset_control_deassert(prl->rst);
+
+	img_prl_out_writel(prl, ctl_reg, IMG_PRL_OUT_CTL);
+}
+
+static int img_prl_out_get_edge(struct snd_kcontrol *kcontrol,
+				  struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
+	struct img_prl_out *prl = snd_soc_dai_get_drvdata(cpu_dai);
+	u32 reg;
+	unsigned long flags;
+
+	spin_lock_irqsave(&prl->lock, flags);
+	reg = img_prl_out_readl(prl, IMG_PRL_OUT_CTL);
+	ucontrol->value.integer.value[0] = !!(reg & IMG_PRL_OUT_CTL_EDGE_MASK);
+	spin_unlock_irqrestore(&prl->lock, flags);
+
+	return 0;
+}
+
+static int img_prl_out_set_edge(struct snd_kcontrol *kcontrol,
+				  struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
+	struct img_prl_out *prl = snd_soc_dai_get_drvdata(cpu_dai);
+	unsigned long flags;
+	int ret = 0;
+	u32 reg;
+
+	spin_lock_irqsave(&prl->lock, flags);
+	if (prl->active) {
+		ret = -EBUSY;
+	} else {
+		reg = img_prl_out_readl(prl, IMG_PRL_OUT_CTL);
+		if (ucontrol->value.integer.value[0])
+			reg |= IMG_PRL_OUT_CTL_EDGE_MASK;
+		else
+			reg &= ~IMG_PRL_OUT_CTL_EDGE_MASK;
+		img_prl_out_writel(prl, reg, IMG_PRL_OUT_CTL);
+	}
+	spin_unlock_irqrestore(&prl->lock, flags);
+
+	return ret;
+}
+
+static int img_prl_out_get_ch_swap(struct snd_kcontrol *kcontrol,
+				  struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
+	struct img_prl_out *prl = snd_soc_dai_get_drvdata(cpu_dai);
+	u32 reg;
+	unsigned long flags;
+
+	spin_lock_irqsave(&prl->lock, flags);
+	reg = img_prl_out_readl(prl, IMG_PRL_OUT_CTL);
+	ucontrol->value.integer.value[0] = !!(reg & IMG_PRL_OUT_CTL_CH_MASK);
+	spin_unlock_irqrestore(&prl->lock, flags);
+
+	return 0;
+}
+
+static int img_prl_out_set_ch_swap(struct snd_kcontrol *kcontrol,
+				  struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
+	struct img_prl_out *prl = snd_soc_dai_get_drvdata(cpu_dai);
+	unsigned long flags;
+	int ret = 0;
+	u32 reg;
+
+	spin_lock_irqsave(&prl->lock, flags);
+	if (prl->active) {
+		ret = -EBUSY;
+	} else {
+		reg = img_prl_out_readl(prl, IMG_PRL_OUT_CTL);
+		if (ucontrol->value.integer.value[0])
+			reg |= IMG_PRL_OUT_CTL_CH_MASK;
+		else
+			reg &= ~IMG_PRL_OUT_CTL_CH_MASK;
+		img_prl_out_writel(prl, reg, IMG_PRL_OUT_CTL);
+	}
+	spin_unlock_irqrestore(&prl->lock, flags);
+
+	return ret;
+}
+
+static struct snd_kcontrol_new img_prl_out_controls[] = {
+	{
+		.iface = SNDRV_CTL_ELEM_IFACE_PCM,
+		.name = "Parallel Out Edge Falling",
+		.info = snd_ctl_boolean_mono_info,
+		.get = img_prl_out_get_edge,
+		.put = img_prl_out_set_edge
+	},
+	{
+		.iface = SNDRV_CTL_ELEM_IFACE_PCM,
+		.name = "Parallel Out Channel Swap",
+		.info = snd_ctl_boolean_mono_info,
+		.get = img_prl_out_get_ch_swap,
+		.put = img_prl_out_set_ch_swap
+	}
+};
+
+static int img_prl_out_trigger(struct snd_pcm_substream *substream, int cmd,
+			struct snd_soc_dai *dai)
+{
+	struct img_prl_out *prl = snd_soc_dai_get_drvdata(dai);
+	unsigned long flags;
+	int ret = 0;
+	u32 reg;
+
+	dev_dbg(prl->dev, "trigger cmd %d\n", cmd);
+
+	spin_lock_irqsave(&prl->lock, flags);
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+	case SNDRV_PCM_TRIGGER_RESUME:
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+		reg = img_prl_out_readl(prl, IMG_PRL_OUT_CTL);
+		reg |= IMG_PRL_OUT_CTL_ME_MASK;
+		img_prl_out_writel(prl, reg, IMG_PRL_OUT_CTL);
+		prl->active = true;
+		break;
+	case SNDRV_PCM_TRIGGER_STOP:
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+		img_prl_out_reset(prl);
+		prl->active = false;
+		break;
+	default:
+		ret = -EINVAL;
+	}
+
+	spin_unlock_irqrestore(&prl->lock, flags);
+
+	return ret;
+}
+
+static int img_prl_out_hw_params(struct snd_pcm_substream *substream,
+	struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
+{
+	struct img_prl_out *prl = snd_soc_dai_get_drvdata(dai);
+	unsigned int rate, format, channels;
+	u32 reg, reg_set = 0;
+	unsigned long flags;
+
+	rate = params_rate(params);
+	format = params_format(params);
+	channels = params_channels(params);
+
+	dev_dbg(prl->dev, "hw_params rate %u channels %u format %u\n",
+			rate, channels, format);
+
+	switch (params_format(params)) {
+	case SNDRV_PCM_FORMAT_S32_LE:
+		reg_set |= IMG_PRL_OUT_CTL_PACKH_MASK;
+		break;
+	case SNDRV_PCM_FORMAT_S24_LE:
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	if (params_channels(params) != 2)
+		return -EINVAL;
+
+	clk_set_rate(prl->clk_ref, rate * 256);
+
+	spin_lock_irqsave(&prl->lock, flags);
+	reg = img_prl_out_readl(prl, IMG_PRL_OUT_CTL);
+	reg = (reg & ~IMG_PRL_OUT_CTL_PACKH_MASK) | reg_set;
+	img_prl_out_writel(prl, reg, IMG_PRL_OUT_CTL);
+	spin_unlock_irqrestore(&prl->lock, flags);
+
+	return 0;
+}
+
+static const struct snd_soc_dai_ops img_prl_out_dai_ops = {
+	.trigger = img_prl_out_trigger,
+	.hw_params = img_prl_out_hw_params,
+};
+
+static int img_prl_out_dai_probe(struct snd_soc_dai *dai)
+{
+	struct img_prl_out *prl = snd_soc_dai_get_drvdata(dai);
+
+	snd_soc_dai_init_dma_data(dai, &prl->dma_data, NULL);
+
+	snd_soc_add_dai_controls(dai, img_prl_out_controls,
+			ARRAY_SIZE(img_prl_out_controls));
+
+	return 0;
+}
+
+static struct snd_soc_dai_driver img_prl_out_dai = {
+	.probe = img_prl_out_dai_probe,
+	.playback = {
+		.channels_min = 2,
+		.channels_max = 2,
+		.rates = SNDRV_PCM_RATE_8000_192000,
+		.formats = SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S24_LE
+	},
+	.ops = &img_prl_out_dai_ops
+};
+
+static const struct snd_soc_component_driver img_prl_out_component = {
+	.name = "img-prl-out"
+};
+
+static int img_prl_out_probe(struct platform_device *pdev)
+{
+	struct img_prl_out *prl;
+	struct resource *res;
+	void __iomem *base;
+	int ret;
+
+	prl = devm_kzalloc(&pdev->dev, sizeof(*prl), GFP_KERNEL);
+	if (!prl)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, prl);
+
+	prl->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);
+
+	prl->base = base;
+
+	prl->rst = devm_reset_control_get(&pdev->dev, "rst");
+	if (IS_ERR(prl->rst)) {
+		dev_err(&pdev->dev, "No top level reset found\n");
+		return PTR_ERR(prl->rst);
+	}
+
+	prl->clk_sys = devm_clk_get(&pdev->dev, "sys");
+	if (IS_ERR(prl->clk_sys))
+		return PTR_ERR(prl->clk_sys);
+
+	prl->clk_ref = devm_clk_get(&pdev->dev, "ref");
+	if (IS_ERR(prl->clk_ref))
+		return PTR_ERR(prl->clk_ref);
+
+	ret = clk_prepare_enable(prl->clk_sys);
+	if (ret)
+		return ret;
+
+	img_prl_out_writel(prl, IMG_PRL_OUT_CTL_EDGE_MASK, IMG_PRL_OUT_CTL);
+	img_prl_out_reset(prl);
+
+	pm_runtime_enable(&pdev->dev);
+	if (!pm_runtime_enabled(&pdev->dev)) {
+		ret = img_prl_out_resume(&pdev->dev);
+		if (ret)
+			goto err_pm_disable;
+	}
+
+	spin_lock_init(&prl->lock);
+
+	prl->dma_data.addr = res->start + IMG_PRL_OUT_TX_FIFO;
+	prl->dma_data.addr_width = 4;
+	prl->dma_data.maxburst = 4;
+
+	ret = devm_snd_soc_register_component(&pdev->dev,
+			&img_prl_out_component,
+			&img_prl_out_dai, 1);
+	if (ret)
+		goto err_suspend;
+
+	ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
+	if (ret)
+		goto err_suspend;
+
+	dev_dbg(&pdev->dev, "Probe successful\n");
+
+	return 0;
+
+err_suspend:
+	if (!pm_runtime_status_suspended(&pdev->dev))
+		img_prl_out_suspend(&pdev->dev);
+err_pm_disable:
+	pm_runtime_disable(&pdev->dev);
+	clk_disable_unprepare(prl->clk_sys);
+
+	return ret;
+}
+
+static int img_prl_out_dev_remove(struct platform_device *pdev)
+{
+	struct img_prl_out *prl = platform_get_drvdata(pdev);
+
+	pm_runtime_disable(&pdev->dev);
+	if (!pm_runtime_status_suspended(&pdev->dev))
+		img_prl_out_suspend(&pdev->dev);
+
+	clk_disable_unprepare(prl->clk_sys);
+
+	return 0;
+}
+
+static const struct of_device_id img_prl_out_of_match[] = {
+	{ .compatible = "img,parallel-out" },
+	{}
+};
+MODULE_DEVICE_TABLE(of, img_prl_of_match);
+
+static const struct dev_pm_ops img_prl_out_pm_ops = {
+	SET_RUNTIME_PM_OPS(img_prl_out_suspend,
+			   img_prl_out_resume, NULL)
+};
+
+static struct platform_driver img_prl_out_driver = {
+	.driver = {
+		.name = "img-parallel-out",
+		.of_match_table = img_prl_out_of_match,
+		.pm = &img_prl_out_pm_ops
+	},
+	.probe = img_prl_out_probe,
+	.remove = img_prl_out_dev_remove
+};
+module_platform_driver(img_prl_out_driver);
+
+MODULE_AUTHOR("Damien Horsley <Damien.Horsley@imgtec.com>");
+MODULE_DESCRIPTION("IMG Parallel Output Driver");
+MODULE_LICENSE("GPL v2");