mirror of
https://github.com/brain-hackers/u-boot-brain
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2bbc1bbf5d
There is no proper power domain support for the keystone platforms. However we need to turn off the USB domains before jumping to linux or it fail to boot (observed with k2e and k2l platforms). This can be done in the PHY driver as it is dedicated only to the keystone platforms and matches the required on/off sequence. Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
132 lines
3.0 KiB
C
132 lines
3.0 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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#include <asm/arch/psc_defs.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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u32 psc_domain;
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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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int rc;
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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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/* Release USB from reset */
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rc = psc_enable_module(keystone->psc_domain);
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if (rc) {
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debug("Cannot enable USB module");
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return -rc;
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}
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mdelay(10);
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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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struct udevice *dev = phy->dev;
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struct keystone_usb_phy *keystone = dev_get_priv(dev);
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if (psc_disable_module(keystone->psc_domain))
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debug("failed to disable USB module!\n");
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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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int rc;
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struct keystone_usb_phy *keystone = dev_get_priv(dev);
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rc = dev_read_u32(dev, "psc-domain", &keystone->psc_domain);
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if (rc)
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return rc;
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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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