MLK-16013-2 phy: add imx8mq usb phy driver

Use generic phy driver for i.mx8mq USB3 phy reset and clock enable.

Reviewed-by: Peter Chen <peter.chen@nxp.com>
Signed-off-by: Li Jun <jun.li@nxp.com>

3 files changed, 136 insertions, 0 deletions

diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
index af1bbb87d618..317fbd299fd0 100644
--- a/drivers/phy/Kconfig
+++ b/drivers/phy/Kconfig
@@ -503,4 +503,9 @@ config PHY_MIXEL_LVDS_COMBO
 	select GENERIC_PHY
 	default ARCH_FSL_IMX8QXP
 
+config PHY_FSL_IMX8MQ_USB
+	bool
+	depends on OF
+	select GENERIC_PHY
+	default ARCH_FSL_IMX8MQ
 endmenu
diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
index e80a9879c1b9..87afba03eb2e 100644
--- a/drivers/phy/Makefile
+++ b/drivers/phy/Makefile
@@ -62,3 +62,4 @@ obj-$(CONFIG_ARCH_TEGRA) += tegra/
 obj-$(CONFIG_PHY_NS2_PCIE)		+= phy-bcm-ns2-pcie.o
 obj-$(CONFIG_PHY_MIXEL_LVDS)	+= phy-mixel-lvds.o
 obj-$(CONFIG_PHY_MIXEL_LVDS_COMBO)	+= phy-mixel-lvds-combo.o
+obj-$(CONFIG_PHY_FSL_IMX8MQ_USB)	+= phy-fsl-imx8mq-usb.o
diff --git a/drivers/phy/phy-fsl-imx8mq-usb.c b/drivers/phy/phy-fsl-imx8mq-usb.c
new file mode 100644
index 000000000000..5d6e9198a6ab
--- /dev/null
+++ b/drivers/phy/phy-fsl-imx8mq-usb.c
@@ -0,0 +1,130 @@
+/*
+ * Copyright (c) 2017 NXP.
+ *
+ * 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/clk.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/phy/phy.h>
+#include <linux/io.h>
+
+#define PHY_CTRL0			0x0
+#define PHY_CTRL0_REF_SSP_EN		BIT(2)
+
+#define PHY_CTRL1			0x4
+#define PHY_CTRL1_RESET			BIT(0)
+#define PHY_CTRL1_ATERESET		BIT(3)
+#define PHY_CTRL1_VDATSRCENB0		BIT(19)
+#define PHY_CTRL1_VDATDETENB0		BIT(20)
+
+#define PHY_CTRL2			0x8
+#define PHY_CTRL2_TXENABLEN0		BIT(8)
+
+struct imx8mq_usb_phy {
+	struct phy *phy;
+	struct clk *clk;
+	void __iomem *base;
+};
+
+static int imx8mq_phy_start(struct phy *_phy)
+{
+	struct imx8mq_usb_phy *phy = phy_get_drvdata(_phy);
+
+	return clk_prepare_enable(phy->clk);
+}
+
+static int imx8mq_phy_exit(struct phy *_phy)
+{
+	struct imx8mq_usb_phy *phy = phy_get_drvdata(_phy);
+
+	clk_disable_unprepare(phy->clk);
+
+	return 0;
+}
+
+static struct phy_ops imx8mq_usb_phy_ops = {
+	.init		= imx8mq_phy_start,
+	.exit		= imx8mq_phy_exit,
+	.owner		= THIS_MODULE,
+};
+
+static void imx8mq_usb_phy_init(struct imx8mq_usb_phy *phy)
+{
+	u32 value;
+
+	value = readl(phy->base + PHY_CTRL1);
+	value &= ~(PHY_CTRL1_VDATSRCENB0 | PHY_CTRL1_VDATDETENB0);
+	value |= PHY_CTRL1_RESET | PHY_CTRL1_ATERESET;
+	writel(value, phy->base + PHY_CTRL1);
+
+	value = readl(phy->base + PHY_CTRL0);
+	value |= PHY_CTRL0_REF_SSP_EN;
+	writel(value, phy->base + PHY_CTRL0);
+
+	value = readl(phy->base + PHY_CTRL2);
+	value |= PHY_CTRL2_TXENABLEN0;
+	writel(value, phy->base + PHY_CTRL2);
+
+	value = readl(phy->base + PHY_CTRL1);
+	value &= ~(PHY_CTRL1_RESET | PHY_CTRL1_ATERESET);
+	writel(value, phy->base + PHY_CTRL1);
+}
+
+static int imx8mq_usb_phy_probe(struct platform_device *pdev)
+{
+	struct phy_provider *phy_provider;
+	struct device *dev = &pdev->dev;
+	struct imx8mq_usb_phy *imx_phy;
+	struct resource *res;
+
+	imx_phy = devm_kzalloc(dev, sizeof(*imx_phy), GFP_KERNEL);
+	if (!imx_phy)
+		return -ENOMEM;
+
+	imx_phy->clk = devm_clk_get(dev, "usb_phy_root_clk");
+	if (IS_ERR(imx_phy->clk)) {
+		dev_err(dev, "failed to get imx8mq usb phy clock\n");
+		return PTR_ERR(imx_phy->clk);
+	}
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	imx_phy->base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(imx_phy->base))
+		return PTR_ERR(imx_phy->base);
+
+	imx_phy->phy = devm_phy_create(dev, NULL, &imx8mq_usb_phy_ops);
+	if (IS_ERR(imx_phy->phy))
+		return PTR_ERR(imx_phy->phy);
+
+	phy_set_drvdata(imx_phy->phy, imx_phy);
+
+	imx8mq_usb_phy_init(imx_phy);
+
+	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
+
+	return PTR_ERR_OR_ZERO(phy_provider);
+}
+
+static const struct of_device_id imx8mq_usb_phy_of_match[] = {
+	{.compatible = "fsl,imx8mq-usb-phy",},
+	{ },
+};
+MODULE_DEVICE_TABLE(of, imx8mq_usb_phy_of_match);
+
+static struct platform_driver imx8mq_usb_phy_driver = {
+	.probe	= imx8mq_usb_phy_probe,
+	.driver = {
+		.name	= "imx8mq-usb-phy",
+		.of_match_table	= imx8mq_usb_phy_of_match,
+	}
+};
+module_platform_driver(imx8mq_usb_phy_driver);
+
+MODULE_DESCRIPTION("FSL IMX8MQ USB PHY driver");
+MODULE_ALIAS("platform:imx8mq-usb-phy");
+MODULE_LICENSE("GPL");