From 4b12783c8e011859e70ba5811654a21ee1a22237 Mon Sep 17 00:00:00 2001 From: Jean-Jacques Hiblot Date: Tue, 4 Dec 2018 11:12:59 +0100 Subject: PHY: Add phy driver for the keystone USB PHY Signed-off-by: Jean-Jacques Hiblot Reviewed-by: Tom Rini --- drivers/phy/keystone-usb-phy.c | 109 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 109 insertions(+) create mode 100644 drivers/phy/keystone-usb-phy.c (limited to 'drivers/phy/keystone-usb-phy.c') diff --git a/drivers/phy/keystone-usb-phy.c b/drivers/phy/keystone-usb-phy.c new file mode 100644 index 00000000000..e8146cabfa5 --- /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 + */ + +#include +#include +#include +#include +#include + +/* 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), +}; -- cgit v1.2.3