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