drivers/phy/keystone-usb-phy.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com/
   4  * Written by Jean-Jacques Hiblot  <jjhiblot@ti.com>
   5  */
   6
   7 #include <common.h>
   8 #include <dm.h>
   9 #include <log.h>
  10 #include <dm/device.h>
  11 #include <generic-phy.h>
  12 #include <asm/io.h>
  13 #include <asm/arch/psc_defs.h>
  14 #include <linux/bitops.h>
  15 #include <linux/delay.h>
  16
  17 /* USB PHY control register offsets */
  18 #define USB_PHY_CTL_UTMI                0x0000
  19 #define USB_PHY_CTL_PIPE                0x0004
  20 #define USB_PHY_CTL_PARAM_1             0x0008
  21 #define USB_PHY_CTL_PARAM_2             0x000c
  22 #define USB_PHY_CTL_CLOCK               0x0010
  23 #define USB_PHY_CTL_PLL                 0x0014
  24
  25 #define PHY_OTG_VBUSVLDECTSEL           BIT(16)
  26 #define PHY_REF_SSP_EN                  BIT(29)
  27
  28 struct keystone_usb_phy {
  29         u32 psc_domain;
  30         void __iomem *reg;
  31 };
  32
  33 static int keystone_usb_init(struct phy *phy)
  34 {
  35         u32 val;
  36         int rc;
  37         struct udevice *dev = phy->dev;
  38         struct keystone_usb_phy *keystone = dev_get_priv(dev);
  39
  40         /* Release USB from reset */
  41         rc = psc_enable_module(keystone->psc_domain);
  42         if (rc) {
  43                 debug("Cannot enable USB module");
  44                 return -rc;
  45         }
  46         mdelay(10);
  47
  48         /*
  49          * VBUSVLDEXTSEL has a default value of 1 in BootCfg but shouldn't.
  50          * It should always be cleared because our USB PHY has an onchip VBUS
  51          * analog comparator.
  52          */
  53         val = readl(keystone->reg + USB_PHY_CTL_CLOCK);
  54         /* quit selecting the vbusvldextsel by default! */
  55         val &= ~PHY_OTG_VBUSVLDECTSEL;
  56         writel(val, keystone->reg + USB_PHY_CTL_CLOCK);
  57
  58         return 0;
  59 }
  60
  61 static int keystone_usb_power_on(struct phy *phy)
  62 {
  63         u32 val;
  64         struct udevice *dev = phy->dev;
  65         struct keystone_usb_phy *keystone = dev_get_priv(dev);
  66
  67         val = readl(keystone->reg + USB_PHY_CTL_CLOCK);
  68         val |= PHY_REF_SSP_EN;
  69         writel(val, keystone->reg + USB_PHY_CTL_CLOCK);
  70
  71         return 0;
  72 }
  73
  74 static int keystone_usb_power_off(struct phy *phy)
  75 {
  76         u32 val;
  77         struct udevice *dev = phy->dev;
  78         struct keystone_usb_phy *keystone = dev_get_priv(dev);
  79
  80         val = readl(keystone->reg + USB_PHY_CTL_CLOCK);
  81         val &= ~PHY_REF_SSP_EN;
  82         writel(val, keystone->reg + USB_PHY_CTL_CLOCK);
  83
  84         return 0;
  85 }
  86
  87 static int keystone_usb_exit(struct phy *phy)
  88 {
  89         struct udevice *dev = phy->dev;
  90         struct keystone_usb_phy *keystone = dev_get_priv(dev);
  91
  92         if (psc_disable_module(keystone->psc_domain))
  93                 debug("failed to disable USB module!\n");
  94
  95         return 0;
  96 }
  97
  98 static int keystone_usb_phy_probe(struct udevice *dev)
  99 {
 100         int rc;
 101         struct keystone_usb_phy *keystone = dev_get_priv(dev);
 102
 103         rc = dev_read_u32(dev, "psc-domain", &keystone->psc_domain);
 104         if (rc)
 105                 return rc;
 106
 107         keystone->reg = dev_remap_addr_index(dev, 0);
 108         if (!keystone->reg) {
 109                 pr_err("unable to remap usb phy\n");
 110                 return -EINVAL;
 111         }
 112         return 0;
 113 }
 114
 115 static const struct udevice_id keystone_usb_phy_ids[] = {
 116         { .compatible = "ti,keystone-usbphy" },
 117         { }
 118 };
 119
 120 static struct phy_ops keystone_usb_phy_ops = {
 121         .init = keystone_usb_init,
 122         .power_on = keystone_usb_power_on,
 123         .power_off = keystone_usb_power_off,
 124         .exit = keystone_usb_exit,
 125 };
 126
 127 U_BOOT_DRIVER(keystone_usb_phy) = {
 128         .name   = "keystone_usb_phy",
 129         .id     = UCLASS_PHY,
 130         .of_match = keystone_usb_phy_ids,
 131         .ops = &keystone_usb_phy_ops,
 132         .probe = keystone_usb_phy_probe,
 133         .priv_auto      = sizeof(struct keystone_usb_phy),
 134 };