target/linux/ramips/patches-3.14/0037-USB-phy-add-ralink-SoC-driver.patch

   1 From 900fa0abfea0cb7562c523769981dadc25f1f8cd Mon Sep 17 00:00:00 2001
   2 From: John Crispin <blogic@openwrt.org>
   3 Date: Sun, 27 Jul 2014 09:43:42 +0100
   4 Subject: [PATCH 37/57] USB: phy: add ralink SoC driver
   5
   6 Signed-off-by: John Crispin <blogic@openwrt.org>
   7 ---
   8  drivers/usb/phy/Kconfig      |    8 ++
   9  drivers/usb/phy/Makefile     |    1 +
  10  drivers/usb/phy/ralink-phy.c |  190 ++++++++++++++++++++++++++++++++++++++++++
  11  3 files changed, 199 insertions(+)
  12  create mode 100644 drivers/usb/phy/ralink-phy.c
  13
  14 --- a/drivers/usb/phy/Kconfig
  15 +++ b/drivers/usb/phy/Kconfig
  16 @@ -251,6 +251,14 @@ config USB_RCAR_GEN2_PHY
  17           To compile this driver as a module, choose M here: the
  18           module will be called phy-rcar-gen2-usb.
  19
  20 +config RALINK_USBPHY
  21 +       bool "Ralink USB PHY controller Driver"
  22 +       depends on MIPS && RALINK
  23 +       select USB_PHY
  24 +       help
  25 +         Enable this to support ralink USB phy controller for ralink
  26 +         SoCs.
  27 +
  28  config USB_ULPI
  29         bool "Generic ULPI Transceiver Driver"
  30         depends on ARM
  31 --- a/drivers/usb/phy/Makefile
  32 +++ b/drivers/usb/phy/Makefile
  33 @@ -33,3 +33,4 @@ obj-$(CONFIG_USB_RCAR_GEN2_PHY)               += phy-
  34  obj-$(CONFIG_USB_ULPI)                 += phy-ulpi.o
  35  obj-$(CONFIG_USB_ULPI_VIEWPORT)                += phy-ulpi-viewport.o
  36  obj-$(CONFIG_KEYSTONE_USB_PHY)         += phy-keystone.o
  37 +obj-$(CONFIG_RALINK_USBPHY)            += ralink-phy.o
  38 --- /dev/null
  39 +++ b/drivers/usb/phy/ralink-phy.c
  40 @@ -0,0 +1,191 @@
  41 +/*
  42 + * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
  43 + *
  44 + * based on: Renesas R-Car USB phy driver
  45 + *
  46 + * This program is free software; you can redistribute it and/or modify
  47 + * it under the terms of the GNU General Public License version 2 as
  48 + * published by the Free Software Foundation.
  49 + */
  50 +
  51 +#include <linux/delay.h>
  52 +#include <linux/io.h>
  53 +#include <linux/usb/otg.h>
  54 +#include <linux/of_platform.h>
  55 +#include <linux/platform_device.h>
  56 +#include <linux/spinlock.h>
  57 +#include <linux/module.h>
  58 +#include <linux/reset.h>
  59 +
  60 +#include <asm/mach-ralink/ralink_regs.h>
  61 +
  62 +#define RT_SYSC_REG_SYSCFG1            0x014
  63 +#define RT_SYSC_REG_CLKCFG1            0x030
  64 +#define RT_SYSC_REG_USB_PHY_CFG        0x05c
  65 +
  66 +#define RT_RSTCTRL_UDEV                BIT(25)
  67 +#define RT_RSTCTRL_UHST                BIT(22)
  68 +#define RT_SYSCFG1_USB0_HOST_MODE      BIT(10)
  69 +
  70 +#define MT7620_CLKCFG1_UPHY0_CLK_EN    BIT(25)
  71 +#define MT7620_CLKCFG1_UPHY1_CLK_EN    BIT(22)
  72 +#define RT_CLKCFG1_UPHY1_CLK_EN        BIT(20)
  73 +#define RT_CLKCFG1_UPHY0_CLK_EN        BIT(18)
  74 +
  75 +#define USB_PHY_UTMI_8B60M             BIT(1)
  76 +#define UDEV_WAKEUP                    BIT(0)
  77 +
  78 +static atomic_t usb_pwr_ref = ATOMIC_INIT(0);
  79 +static struct reset_control *rstdev;
  80 +static struct reset_control *rsthost;
  81 +static u32 phy_clk;
  82 +
  83 +static void usb_phy_enable(int state)
  84 +{
  85 +       if (state)
  86 +               rt_sysc_m32(0, phy_clk, RT_SYSC_REG_CLKCFG1);
  87 +       else
  88 +               rt_sysc_m32(phy_clk, 0, RT_SYSC_REG_CLKCFG1);
  89 +       mdelay(100);
  90 +}
  91 +
  92 +static int usb_power_on(struct usb_phy *phy)
  93 +{
  94 +       if (atomic_inc_return(&usb_pwr_ref) == 1) {
  95 +               u32 t;
  96 +
  97 +               usb_phy_enable(1);
  98 +
  99 +//             reset_control_assert(rstdev);
 100 +//             reset_control_assert(rsthost);
 101 +
 102 +               if (OTG_STATE_B_HOST) {
 103 +                       rt_sysc_m32(0, RT_SYSCFG1_USB0_HOST_MODE, RT_SYSC_REG_SYSCFG1);
 104 +                       if (!IS_ERR(rsthost))
 105 +                               reset_control_deassert(rsthost);
 106 +               } else {
 107 +                       rt_sysc_m32(RT_SYSCFG1_USB0_HOST_MODE, 0, RT_SYSC_REG_SYSCFG1);
 108 +                       if (!IS_ERR(rstdev))
 109 +                               reset_control_deassert(rstdev);
 110 +               }
 111 +               mdelay(100);
 112 +
 113 +               t = rt_sysc_r32(RT_SYSC_REG_USB_PHY_CFG);
 114 +               dev_info(phy->dev, "remote usb device wakeup %s\n",
 115 +                               (t & UDEV_WAKEUP) ? ("enabbled") : ("disabled"));
 116 +               if (t & USB_PHY_UTMI_8B60M)
 117 +                       dev_info(phy->dev, "UTMI 8bit 60MHz\n");
 118 +               else
 119 +                       dev_info(phy->dev, "UTMI 16bit 30MHz\n");
 120 +       }
 121 +
 122 +       return 0;
 123 +}
 124 +
 125 +static void usb_power_off(struct usb_phy *phy)
 126 +{
 127 +       if (atomic_dec_return(&usb_pwr_ref) == 0) {
 128 +               usb_phy_enable(0);
 129 +               if (!IS_ERR(rstdev))
 130 +                       reset_control_assert(rstdev);
 131 +               if (!IS_ERR(rsthost))
 132 +                       reset_control_assert(rsthost);
 133 +       }
 134 +}
 135 +
 136 +static int usb_set_host(struct usb_otg *otg, struct usb_bus *host)
 137 +{
 138 +       otg->gadget = NULL;
 139 +       otg->host = host;
 140 +
 141 +       return 0;
 142 +}
 143 +
 144 +static int usb_set_peripheral(struct usb_otg *otg,
 145 +               struct usb_gadget *gadget)
 146 +{
 147 +       otg->host = NULL;
 148 +       otg->gadget = gadget;
 149 +
 150 +       return 0;
 151 +}
 152 +
 153 +static const struct of_device_id ralink_usbphy_dt_match[] = {
 154 +       { .compatible = "ralink,rt3xxx-usbphy", .data = (void *) (RT_CLKCFG1_UPHY1_CLK_EN | RT_CLKCFG1_UPHY0_CLK_EN) },
 155 +       { .compatible = "ralink,mt7620a-usbphy", .data = (void *) (MT7620_CLKCFG1_UPHY1_CLK_EN | MT7620_CLKCFG1_UPHY0_CLK_EN) },
 156 +       {},
 157 +};
 158 +MODULE_DEVICE_TABLE(of, ralink_usbphy_dt_match);
 159 +
 160 +static int usb_phy_probe(struct platform_device *pdev)
 161 +{
 162 +       const struct of_device_id *match;
 163 +       struct device *dev = &pdev->dev;
 164 +       struct usb_otg *otg;
 165 +       struct usb_phy *phy;
 166 +       int ret;
 167 +
 168 +       match = of_match_device(ralink_usbphy_dt_match, &pdev->dev);
 169 +       phy_clk = (int) match->data;
 170 +
 171 +       rsthost = devm_reset_control_get(&pdev->dev, "host");
 172 +       rstdev = devm_reset_control_get(&pdev->dev, "device");
 173 +
 174 +       phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
 175 +       if (!phy) {
 176 +               dev_err(&pdev->dev, "unable to allocate memory for USB PHY\n");
 177 +               return -ENOMEM;
 178 +       }
 179 +
 180 +       otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
 181 +       if (!otg) {
 182 +               dev_err(&pdev->dev, "unable to allocate memory for USB OTG\n");
 183 +               return -ENOMEM;
 184 +       }
 185 +
 186 +       phy->dev = dev;
 187 +       phy->label = dev_name(dev);
 188 +       phy->init = usb_power_on;
 189 +       phy->shutdown = usb_power_off;
 190 +       otg->set_host = usb_set_host;
 191 +       otg->set_peripheral = usb_set_peripheral;
 192 +       otg->phy = phy;
 193 +       phy->otg = otg;
 194 +       ret = usb_add_phy(phy, USB_PHY_TYPE_USB2);
 195 +
 196 +       if (ret < 0) {
 197 +               dev_err(dev, "usb phy addition error\n");
 198 +               return ret;
 199 +       }
 200 +
 201 +       platform_set_drvdata(pdev, phy);
 202 +
 203 +       dev_info(&pdev->dev, "loaded\n");
 204 +
 205 +       return ret;
 206 +}
 207 +
 208 +static int usb_phy_remove(struct platform_device *pdev)
 209 +{
 210 +       struct usb_phy *phy = platform_get_drvdata(pdev);
 211 +
 212 +       usb_remove_phy(phy);
 213 +
 214 +       return 0;
 215 +}
 216 +
 217 +static struct platform_driver usb_phy_driver = {
 218 +       .driver         = {
 219 +               .owner  = THIS_MODULE,
 220 +               .name   = "rt3xxx-usbphy",
 221 +               .of_match_table = of_match_ptr(ralink_usbphy_dt_match),
 222 +       },
 223 +       .probe          = usb_phy_probe,
 224 +       .remove         = usb_phy_remove,
 225 +};
 226 +
 227 +module_platform_driver(usb_phy_driver);
 228 +
 229 +MODULE_LICENSE("GPL v2");
 230 +MODULE_DESCRIPTION("Ralink USB phy");
 231 +MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");