drivers/phy/bcm6368-usbh-phy.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2018 Álvaro Fernández Rojas <noltari@gmail.com>
   4  *
   5  * Derived from linux/arch/mips/bcm63xx/usb-common.c:
   6  *      Copyright 2008 Maxime Bizon <mbizon@freebox.fr>
   7  *      Copyright 2013 Florian Fainelli <florian@openwrt.org>
   8  */
   9
  10 #include <common.h>
  11 #include <clk.h>
  12 #include <dm.h>
  13 #include <generic-phy.h>
  14 #include <power-domain.h>
  15 #include <reset.h>
  16 #include <asm/io.h>
  17 #include <dm/device.h>
  18
  19 /* USBH PLL Control register */
  20 #define USBH_PLL_REG            0x18
  21 #define USBH_PLL_IDDQ_PWRDN     BIT(9)
  22 #define USBH_PLL_PWRDN_DELAY    BIT(10)
  23
  24 /* USBH Swap Control register */
  25 #define USBH_SWAP_REG           0x1c
  26 #define USBH_SWAP_OHCI_DATA     BIT(0)
  27 #define USBH_SWAP_OHCI_ENDIAN   BIT(1)
  28 #define USBH_SWAP_EHCI_DATA     BIT(3)
  29 #define USBH_SWAP_EHCI_ENDIAN   BIT(4)
  30
  31 /* USBH Setup register */
  32 #define USBH_SETUP_REG          0x28
  33 #define USBH_SETUP_IOC          BIT(4)
  34 #define USBH_SETUP_IPP          BIT(5)
  35
  36 struct bcm6368_usbh_hw {
  37         uint32_t setup_clr;
  38         uint32_t pll_clr;
  39 };
  40
  41 struct bcm6368_usbh_priv {
  42         const struct bcm6368_usbh_hw *hw;
  43         void __iomem *regs;
  44 };
  45
  46 static int bcm6368_usbh_init(struct phy *phy)
  47 {
  48         struct bcm6368_usbh_priv *priv = dev_get_priv(phy->dev);
  49         const struct bcm6368_usbh_hw *hw = priv->hw;
  50
  51         /* configure to work in native cpu endian */
  52         clrsetbits_be32(priv->regs + USBH_SWAP_REG,
  53                         USBH_SWAP_EHCI_ENDIAN | USBH_SWAP_OHCI_ENDIAN,
  54                         USBH_SWAP_EHCI_DATA | USBH_SWAP_OHCI_DATA);
  55
  56         /* setup config */
  57         if (hw->setup_clr)
  58                 clrbits_be32(priv->regs + USBH_SETUP_REG, hw->setup_clr);
  59
  60         setbits_be32(priv->regs + USBH_SETUP_REG, USBH_SETUP_IOC);
  61
  62         /* enable pll control */
  63         if (hw->pll_clr)
  64                 clrbits_be32(priv->regs + USBH_PLL_REG, hw->pll_clr);
  65
  66         return 0;
  67 }
  68
  69 static struct phy_ops bcm6368_usbh_ops = {
  70         .init = bcm6368_usbh_init,
  71 };
  72
  73 static const struct bcm6368_usbh_hw bcm6328_hw = {
  74         .pll_clr = USBH_PLL_IDDQ_PWRDN | USBH_PLL_PWRDN_DELAY,
  75         .setup_clr = 0,
  76 };
  77
  78 static const struct bcm6368_usbh_hw bcm6362_hw = {
  79         .pll_clr = 0,
  80         .setup_clr = 0,
  81 };
  82
  83 static const struct bcm6368_usbh_hw bcm6368_hw = {
  84         .pll_clr = 0,
  85         .setup_clr = 0,
  86 };
  87
  88 static const struct bcm6368_usbh_hw bcm63268_hw = {
  89         .pll_clr = USBH_PLL_IDDQ_PWRDN | USBH_PLL_PWRDN_DELAY,
  90         .setup_clr = USBH_SETUP_IPP,
  91 };
  92
  93 static const struct udevice_id bcm6368_usbh_ids[] = {
  94         {
  95                 .compatible = "brcm,bcm6328-usbh",
  96                 .data = (ulong)&bcm6328_hw,
  97         }, {
  98                 .compatible = "brcm,bcm6362-usbh",
  99                 .data = (ulong)&bcm6362_hw,
 100         }, {
 101                 .compatible = "brcm,bcm6368-usbh",
 102                 .data = (ulong)&bcm6368_hw,
 103         }, {
 104                 .compatible = "brcm,bcm63268-usbh",
 105                 .data = (ulong)&bcm63268_hw,
 106         }, { /* sentinel */ }
 107 };
 108
 109 static int bcm6368_usbh_probe(struct udevice *dev)
 110 {
 111         struct bcm6368_usbh_priv *priv = dev_get_priv(dev);
 112         const struct bcm6368_usbh_hw *hw =
 113                 (const struct bcm6368_usbh_hw *)dev_get_driver_data(dev);
 114 #if defined(CONFIG_POWER_DOMAIN)
 115         struct power_domain pwr_dom;
 116 #endif
 117         struct reset_ctl rst_ctl;
 118         struct clk clk;
 119         int ret;
 120
 121         priv->regs = dev_remap_addr(dev);
 122         if (!priv->regs)
 123                 return -EINVAL;
 124
 125         priv->hw = hw;
 126
 127         /* enable usbh clock */
 128         ret = clk_get_by_name(dev, "usbh", &clk);
 129         if (ret < 0)
 130                 return ret;
 131
 132         ret = clk_enable(&clk);
 133         if (ret < 0)
 134                 return ret;
 135
 136         ret = clk_free(&clk);
 137         if (ret < 0)
 138                 return ret;
 139
 140 #if defined(CONFIG_POWER_DOMAIN)
 141         /* enable power domain */
 142         ret = power_domain_get(dev, &pwr_dom);
 143         if (ret < 0)
 144                 return ret;
 145
 146         ret = power_domain_on(&pwr_dom);
 147         if (ret < 0)
 148                 return ret;
 149
 150         ret = power_domain_free(&pwr_dom);
 151         if (ret < 0)
 152                 return ret;
 153 #endif
 154
 155         /* perform reset */
 156         ret = reset_get_by_index(dev, 0, &rst_ctl);
 157         if (ret < 0)
 158                 return ret;
 159
 160         ret = reset_deassert(&rst_ctl);
 161         if (ret < 0)
 162                 return ret;
 163
 164         ret = reset_free(&rst_ctl);
 165         if (ret < 0)
 166                 return ret;
 167
 168         /* enable usb_ref clock */
 169         ret = clk_get_by_name(dev, "usb_ref", &clk);
 170         if (!ret) {
 171                 ret = clk_enable(&clk);
 172                 if (ret < 0)
 173                         return ret;
 174
 175                 ret = clk_free(&clk);
 176                 if (ret < 0)
 177                         return ret;
 178         }
 179
 180         mdelay(100);
 181
 182         return 0;
 183 }
 184
 185 U_BOOT_DRIVER(bcm6368_usbh) = {
 186         .name = "bcm6368-usbh",
 187         .id = UCLASS_PHY,
 188         .of_match = bcm6368_usbh_ids,
 189         .ops = &bcm6368_usbh_ops,
 190         .priv_auto_alloc_size = sizeof(struct bcm6368_usbh_priv),
 191         .probe = bcm6368_usbh_probe,
 192 };