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- // 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 <log.h>
- #include <dm/device.h>
- #include <generic-phy.h>
- #include <asm/io.h>
- #include <asm/arch/psc_defs.h>
- #include <linux/bitops.h>
- #include <linux/delay.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 {
- u32 psc_domain;
- void __iomem *reg;
- };
- static int keystone_usb_init(struct phy *phy)
- {
- u32 val;
- int rc;
- struct udevice *dev = phy->dev;
- struct keystone_usb_phy *keystone = dev_get_priv(dev);
- /* Release USB from reset */
- rc = psc_enable_module(keystone->psc_domain);
- if (rc) {
- debug("Cannot enable USB module");
- return -rc;
- }
- mdelay(10);
- /*
- * 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)
- {
- struct udevice *dev = phy->dev;
- struct keystone_usb_phy *keystone = dev_get_priv(dev);
- if (psc_disable_module(keystone->psc_domain))
- debug("failed to disable USB module!\n");
- return 0;
- }
- static int keystone_usb_phy_probe(struct udevice *dev)
- {
- int rc;
- struct keystone_usb_phy *keystone = dev_get_priv(dev);
- rc = dev_read_u32(dev, "psc-domain", &keystone->psc_domain);
- if (rc)
- return rc;
- 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 = sizeof(struct keystone_usb_phy),
- };
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