diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/phy/Kconfig | 10 | ||||
| -rw-r--r-- | drivers/phy/Makefile | 1 | ||||
| -rw-r--r-- | drivers/phy/keystone-usb-phy.c | 109 |
3 files changed, 120 insertions, 0 deletions
diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig index 3921e39d7b..825ee7c3be 100644 --- a/drivers/phy/Kconfig +++ b/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 diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile index 53dd5bd0f7..099551d693 100644 --- a/drivers/phy/Makefile +++ b/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 diff --git a/drivers/phy/keystone-usb-phy.c b/drivers/phy/keystone-usb-phy.c new file mode 100644 index 0000000000..e8146cabfa --- /dev/null +++ b/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), +}; |