Subject: [PATCH v2 06/11] phy: da8xx-usb: new driver for DA8XX SoC USB PHY

From: [email-masked] (David Lechner)
Date: Wed, 16 Mar 2016 21:26:39 -0500

This is a new phy driver for the SoC USB controllers on the TI DA8XX
family of microcontrollers. The USB 1.1 PHY is just a simple on/off.
The USB 2.0 PHY also allows overriding the VBUS and ID pins.

Signed-off-by: David Lechner <[email-masked]>
---

v2 changes: This is new patch in v2.

 drivers/phy/Kconfig         |   9 ++
 drivers/phy/Makefile        |   1 +
 drivers/phy/phy-da8xx-usb.c | 295 ++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 305 insertions(+)
 create mode 100644 drivers/phy/phy-da8xx-usb.c

diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
index 26566db..a6060ea 100644
--- a/drivers/phy/Kconfig
+++ b/drivers/phy/Kconfig
@@ -35,6 +35,15 @@ config ARMADA375_USBCLUSTER_PHY
 	depends on OF && HAS_IOMEM
 	select GENERIC_PHY
 
+config PHY_DA8XX_USB
+	tristate "TI DA8XX USB PHY Driver"
+	depends on ARCH_DAVINCI_DA8XX
+	select GENERIC_PHY
+	help
+	  Enable this to support the USB PHY on DA8XX SoCs.
+
+	  This driver controls both the USB 1.1 PHY and the USB 2.0 PHY.
+
 config PHY_DM816X_USB
 	tristate "TI dm816x USB PHY driver"
 	depends on ARCH_OMAP2PLUS
diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
index 24596a9..722e01c 100644
--- a/drivers/phy/Makefile
+++ b/drivers/phy/Makefile
@@ -5,6 +5,7 @@
 obj-$(CONFIG_GENERIC_PHY)		+= phy-core.o
 obj-$(CONFIG_PHY_BERLIN_USB)		+= phy-berlin-usb.o
 obj-$(CONFIG_PHY_BERLIN_SATA)		+= phy-berlin-sata.o
+obj-$(CONFIG_PHY_DA8XX_USB)		+= phy-da8xx-usb.o
 obj-$(CONFIG_PHY_DM816X_USB)		+= phy-dm816x-usb.o
 obj-$(CONFIG_ARMADA375_USBCLUSTER_PHY)	+= phy-armada375-usb2.o
 obj-$(CONFIG_BCM_KONA_USB2_PHY)		+= phy-bcm-kona-usb2.o
diff --git a/drivers/phy/phy-da8xx-usb.c b/drivers/phy/phy-da8xx-usb.c
new file mode 100644
index 0000000..93a5f4d
--- /dev/null
+++ b/drivers/phy/phy-da8xx-usb.c
@@ -0,0 +1,295 @@
+/*
+ * phy-da8xx-usb - TI DaVinci DA8XX USB PHY driver
+ *
+ * Copyright (C) 2016 David Lechner <[email-masked]>
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/module.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+#include <linux/usb/gadget.h>
+#include <linux/usb/musb.h>
+#include <linux/usb/otg.h>
+
+/* DA8xx CFGCHIP2 (USB PHY Control) register bits */
+#define PHYCLKGD		(1 << 17)
+#define VBUSSENSE		(1 << 16)
+#define RESET			(1 << 15)
+#define OTGMODE_MASK		(3 << 13)
+#define NO_OVERRIDE		(0 << 13)
+#define FORCE_HOST		(1 << 13)
+#define FORCE_DEVICE		(2 << 13)
+#define FORCE_HOST_VBUS_LOW	(3 << 13)
+#define USB1PHYCLKMUX		(1 << 12)
+#define USB2PHYCLKMUX		(1 << 11)
+#define PHYPWRDN		(1 << 10)
+#define OTGPWRDN		(1 << 9)
+#define DATPOL			(1 << 8)
+#define USB1SUSPENDM		(1 << 7)
+#define PHY_PLLON		(1 << 6)
+#define SESENDEN		(1 << 5)
+#define VBDTCTEN		(1 << 4)
+#define REFFREQ_MASK		(0xf << 0)
+#define REFFREQ_12MHZ		(1 << 0)
+#define REFFREQ_24MHZ		(2 << 0)
+#define REFFREQ_48MHZ		(3 << 0)
+#define REFFREQ_19_2MHZ		(4 << 0)
+#define REFFREQ_38_4MHZ		(5 << 0)
+#define REFFREQ_13MHZ		(6 << 0)
+#define REFFREQ_26MHZ		(7 << 0)
+#define REFFREQ_20MHZ		(8 << 0)
+#define REFFREQ_40MHZ		(9 << 0)
+
+struct da8xx_usbphy {
+	struct phy_provider	*phy_provider;
+	struct phy		*usb11_phy;
+	struct phy		*usb20_phy;
+	struct clk		*usb11_clk;
+	struct clk		*usb20_clk;
+	void __iomem		*phy_ctrl;
+};
+
+static inline u32 da8xx_usbphy_readl(void __iomem *base)
+{
+	return readl(base);
+}
+
+static inline void da8xx_usbphy_writel(void __iomem *base, u32 value)
+{
+	writel(value, base);
+}
+
+static int da8xx_usb11_phy_init(struct phy *phy)
+{
+	struct da8xx_usbphy *d_phy = phy_get_drvdata(phy);
+	int ret;
+	u32 val;
+
+	ret = clk_prepare_enable(d_phy->usb11_clk);
+	if (ret)
+		return ret;
+
+	val = da8xx_usbphy_readl(d_phy->phy_ctrl);
+	val |= USB1SUSPENDM;
+	da8xx_usbphy_writel(d_phy->phy_ctrl, val);
+
+	return 0;
+}
+
+static int da8xx_usb11_phy_shutdown(struct phy *phy)
+{
+	struct da8xx_usbphy *d_phy = phy_get_drvdata(phy);
+	u32 val;
+
+	val = da8xx_usbphy_readl(d_phy->phy_ctrl);
+	val &= ~USB1SUSPENDM;
+	da8xx_usbphy_writel(d_phy->phy_ctrl, val);
+
+	clk_disable_unprepare(d_phy->usb11_clk);
+
+	return 0;
+}
+
+static const struct phy_ops da8xx_usb11_phy_ops = {
+	.power_on	= da8xx_usb11_phy_init,
+	.power_off	= da8xx_usb11_phy_shutdown,
+	.owner		= THIS_MODULE,
+};
+
+static int da8xx_usb20_phy_init(struct phy *phy)
+{
+	struct da8xx_usbphy *d_phy = phy_get_drvdata(phy);
+	int ret;
+	u32 val;
+
+	ret = clk_prepare_enable(d_phy->usb20_clk);
+	if (ret)
+		return ret;
+
+	val = da8xx_usbphy_readl(d_phy->phy_ctrl);
+	val &= ~OTGPWRDN;
+	da8xx_usbphy_writel(d_phy->phy_ctrl, val);
+
+	return 0;
+}
+
+static int da8xx_usb20_phy_shutdown(struct phy *phy)
+{
+	struct da8xx_usbphy *d_phy = phy_get_drvdata(phy);
+	u32 val;
+
+	val = da8xx_usbphy_readl(d_phy->phy_ctrl);
+	val |= OTGPWRDN;
+	da8xx_usbphy_writel(d_phy->phy_ctrl, val);
+
+	clk_disable_unprepare(d_phy->usb20_clk);
+
+	return 0;
+}
+
+static const struct phy_ops da8xx_usb20_phy_ops = {
+	.power_on	= da8xx_usb20_phy_init,
+	.power_off	= da8xx_usb20_phy_shutdown,
+	.owner		= THIS_MODULE,
+};
+
+int da8xx_usb20_phy_set_mode(struct phy *phy, enum musb_mode mode)
+{
+	struct da8xx_usbphy *d_phy = phy_get_drvdata(phy);
+	u32 val;
+
+	val = da8xx_usbphy_readl(d_phy->phy_ctrl);
+
+	val &= ~OTGMODE_MASK;
+	switch (mode) {
+	case MUSB_HOST:		/* Force VBUS valid, ID = 0 */
+		val |= FORCE_HOST;
+		break;
+	case MUSB_PERIPHERAL:	/* Force VBUS valid, ID = 1 */
+		val |= FORCE_DEVICE;
+		break;
+	case MUSB_OTG:		/* Don't override the VBUS/ID comparators */
+		val |= NO_OVERRIDE;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	da8xx_usbphy_writel(d_phy->phy_ctrl, val);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(da8xx_usb20_phy_set_mode);
+
+static struct phy *da8xx_usbphy_of_xlate(struct device *dev,
+					 struct of_phandle_args *args)
+{
+	struct da8xx_usbphy *d_phy = dev_get_drvdata(dev);
+
+	if (!d_phy)
+		return ERR_PTR(-ENODEV);
+
+	switch (args->args[0]) {
+	case 1:
+		return d_phy->usb11_phy;
+	case 2:
+		return d_phy->usb20_phy;
+	default:
+		return ERR_PTR(-EINVAL);
+	}
+}
+
+static int da8xx_usbphy_probe(struct platform_device *pdev)
+{
+	struct device		*dev = &pdev->dev;
+	struct device_node	*node = dev->of_node;
+	struct da8xx_usbphy	*d_phy;
+	struct resource		*res;
+
+	d_phy = devm_kzalloc(dev, sizeof(*d_phy), GFP_KERNEL);
+	if (!d_phy)
+		return -ENOMEM;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	d_phy->phy_ctrl = devm_ioremap_resource(dev, res);
+	if (IS_ERR(d_phy->phy_ctrl)) {
+		dev_err(dev, "Failed to map resource.\n");
+		return PTR_ERR(d_phy->phy_ctrl);
+	}
+
+	d_phy->usb11_clk = devm_clk_get(dev, "usb11_phy");
+	if (IS_ERR(d_phy->usb11_clk)) {
+		dev_err(dev, "Failed to get usb11_phy clock.\n");
+		return PTR_ERR(d_phy->usb11_clk);
+	}
+
+	d_phy->usb20_clk = devm_clk_get(dev, "usb20_phy");
+	if (IS_ERR(d_phy->usb20_clk)) {
+		dev_err(dev, "Failed to get usb20_phy clock.\n");
+		return PTR_ERR(d_phy->usb20_clk);
+	}
+
+	d_phy->usb11_phy = devm_phy_create(dev, node, &da8xx_usb11_phy_ops);
+	if (IS_ERR(d_phy->usb11_phy)) {
+		dev_err(dev, "Failed to create usb11 phy.\n");
+		return PTR_ERR(d_phy->usb11_phy);
+	}
+
+	d_phy->usb20_phy = devm_phy_create(dev, node, &da8xx_usb20_phy_ops);
+	if (IS_ERR(d_phy->usb20_phy)) {
+		dev_err(dev, "Failed to create usb20 phy.\n");
+		return PTR_ERR(d_phy->usb20_phy);
+	}
+
+	platform_set_drvdata(pdev, d_phy);
+	phy_set_drvdata(d_phy->usb11_phy, d_phy);
+	phy_set_drvdata(d_phy->usb20_phy, d_phy);
+
+	if (node) {
+		d_phy->phy_provider = devm_of_phy_provider_register(dev,
+							da8xx_usbphy_of_xlate);
+		if (IS_ERR(d_phy->phy_provider)) {
+			dev_err(dev, "Failed to create phy provider.\n");
+			return PTR_ERR(d_phy->phy_provider);
+		}
+	} else {
+		int ret;
+
+		ret = phy_create_lookup(d_phy->usb11_phy, "usbphy", "ohci.0");
+		if (ret)
+			dev_warn(dev, "Failed to create usb11 phy lookup .\n");
+		ret = phy_create_lookup(d_phy->usb20_phy, "usbphy", "musb-da8xx");
+		if (ret)
+			dev_warn(dev, "Failed to create usb20 phy lookup .\n");
+	}
+
+	return 0;
+}
+
+static int da8xx_usbphy_remove(struct platform_device *pdev)
+{
+	struct da8xx_usbphy *d_phy = platform_get_drvdata(pdev);
+
+	if (!pdev->dev.of_node) {
+		phy_remove_lookup(d_phy->usb20_phy, "usbphy", "musb-da8xx");
+		phy_remove_lookup(d_phy->usb11_phy, "usbphy", "ohci.0");
+	}
+
+	return 0;
+}
+
+static const struct of_device_id da8xx_usbphy_ids[] = {
+	{ .compatible = "ti,da830-usbphy" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, da8xx_usbphy_ids);
+
+static struct platform_driver da8xx_usbphy_driver = {
+	.probe	= da8xx_usbphy_probe,
+	.remove	= da8xx_usbphy_remove,
+	.driver	= {
+		.name	= "da8xx-usbphy",
+		.of_match_table = da8xx_usbphy_ids,
+	},
+};
+
+module_platform_driver(da8xx_usbphy_driver);
+
+MODULE_ALIAS("platform:da8xx-usbphy");
+MODULE_AUTHOR("David Lechner <[email-masked]>");
+MODULE_DESCRIPTION("TI DA8XX USB PHY driver");
+MODULE_LICENSE("GPL v2");
-- 
1.9.1