diff options
| author |   Angelos Mouzakitis <a.mouzakitis@virtualopensystems.com> | 2023-10-10 14:33:42 +0000 |
|---|---|---|
| committer | Angelos Mouzakitis <a.mouzakitis@virtualopensystems.com> | 2023-10-10 14:33:42 +0000 |
| commit | af1a266670d040d2f4083ff309d732d648afba2a (patch) | |
| tree | 2fc46203448ddcc6f81546d379abfaeb323575e9 /roms/u-boot/drivers/phy/keystone-usb-phy.c | |
| parent | e02cda008591317b1625707ff8e115a4841aa889 (diff) | |
Change-Id: Iaf8d18082d3991dec7c0ebbea540f092188eb4ec
Diffstat (limited to 'roms/u-boot/drivers/phy/keystone-usb-phy.c')
| -rw-r--r-- | roms/u-boot/drivers/phy/keystone-usb-phy.c | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/roms/u-boot/drivers/phy/keystone-usb-phy.c b/roms/u-boot/drivers/phy/keystone-usb-phy.c new file mode 100644 index 000000000..12f8a265f --- /dev/null +++ b/roms/u-boot/drivers/phy/keystone-usb-phy.c @@ -0,0 +1,134 @@ +// 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), +}; |