PHY: Add phy driver for the keystone USB PHY

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>

drivers/phy/Kconfig

@@ -164,4 +164,14 @@ config OMAP_USB2_PHY
 
 	  This PHY is found on OMAP devices supporting USB2.
 
+
+config KEYSTONE_USB_PHY
+	bool "Support TI Keystone USB PHY"
+	depends on PHY
+	depends on ARCH_KEYSTONE
+	help
+	  Support for the USB PHY found on some Keystone (k2) processors
+
+	  This PHY is found on some Keystone (K2) devices supporting USB.
+
 endmenu

drivers/phy/Makefile

@@ -18,3 +18,4 @@ obj-$(CONFIG_PHY_STM32_USBPHYC) += phy-stm32-usbphyc.o
 obj-$(CONFIG_MESON_GXL_USB_PHY) += meson-gxl-usb2.o meson-gxl-usb3.o
 obj-$(CONFIG_MSM8916_USB_PHY) += msm8916-usbh-phy.o
 obj-$(CONFIG_OMAP_USB2_PHY) += omap-usb2-phy.o
+obj-$(CONFIG_KEYSTONE_USB_PHY) += keystone-usb-phy.o

drivers/phy/keystone-usb-phy.c

@@ -0,0 +1,109 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com/
+ * Written by Jean-Jacques Hiblot  <jjhiblot@ti.com>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <dm/device.h>
+#include <generic-phy.h>
+#include <asm/io.h>
+
+/* USB PHY control register offsets */
+#define USB_PHY_CTL_UTMI		0x0000
+#define USB_PHY_CTL_PIPE		0x0004
+#define USB_PHY_CTL_PARAM_1		0x0008
+#define USB_PHY_CTL_PARAM_2		0x000c
+#define USB_PHY_CTL_CLOCK		0x0010
+#define USB_PHY_CTL_PLL			0x0014
+
+#define PHY_OTG_VBUSVLDECTSEL		BIT(16)
+#define PHY_REF_SSP_EN			BIT(29)
+
+struct keystone_usb_phy {
+	void __iomem *reg;
+};
+
+static int keystone_usb_init(struct phy *phy)
+{
+	u32 val;
+	struct udevice *dev = phy->dev;
+	struct keystone_usb_phy *keystone = dev_get_priv(dev);
+
+	/*
+	 * VBUSVLDEXTSEL has a default value of 1 in BootCfg but shouldn't.
+	 * It should always be cleared because our USB PHY has an onchip VBUS
+	 * analog comparator.
+	 */
+	val = readl(keystone->reg + USB_PHY_CTL_CLOCK);
+	/* quit selecting the vbusvldextsel by default! */
+	val &= ~PHY_OTG_VBUSVLDECTSEL;
+	writel(val, keystone->reg + USB_PHY_CTL_CLOCK);
+
+	return 0;
+}
+
+static int keystone_usb_power_on(struct phy *phy)
+{
+	u32 val;
+	struct udevice *dev = phy->dev;
+	struct keystone_usb_phy *keystone = dev_get_priv(dev);
+
+	val = readl(keystone->reg + USB_PHY_CTL_CLOCK);
+	val |= PHY_REF_SSP_EN;
+	writel(val, keystone->reg + USB_PHY_CTL_CLOCK);
+
+	return 0;
+}
+
+static int keystone_usb_power_off(struct phy *phy)
+{
+	u32 val;
+	struct udevice *dev = phy->dev;
+	struct keystone_usb_phy *keystone = dev_get_priv(dev);
+
+	val = readl(keystone->reg + USB_PHY_CTL_CLOCK);
+	val &= ~PHY_REF_SSP_EN;
+	writel(val, keystone->reg + USB_PHY_CTL_CLOCK);
+
+	return 0;
+}
+
+static int keystone_usb_exit(struct phy *phy)
+{
+	return 0;
+}
+
+static int keystone_usb_phy_probe(struct udevice *dev)
+{
+	struct keystone_usb_phy *keystone = dev_get_priv(dev);
+
+	keystone->reg = dev_remap_addr_index(dev, 0);
+	if (!keystone->reg) {
+		pr_err("unable to remap usb phy\n");
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static const struct udevice_id keystone_usb_phy_ids[] = {
+	{ .compatible = "ti,keystone-usbphy" },
+	{ }
+};
+
+static struct phy_ops keystone_usb_phy_ops = {
+	.init = keystone_usb_init,
+	.power_on = keystone_usb_power_on,
+	.power_off = keystone_usb_power_off,
+	.exit = keystone_usb_exit,
+};
+
+U_BOOT_DRIVER(keystone_usb_phy) = {
+	.name	= "keystone_usb_phy",
+	.id	= UCLASS_PHY,
+	.of_match = keystone_usb_phy_ids,
+	.ops = &keystone_usb_phy_ops,
+	.probe = keystone_usb_phy_probe,
+	.priv_auto_alloc_size = sizeof(struct keystone_usb_phy),
+};