target/linux/ramips/patches-3.9/0160-USB-phy-add-ralink-SoC-driver.patch

   1 From efe391a3614b98a0f84fd49e63b4009185ff9a1a Mon Sep 17 00:00:00 2001
   2 From: John Crispin <blogic@openwrt.org>
   3 Date: Thu, 2 May 2013 23:29:08 +0200
   4 Subject: [PATCH 160/164] 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 |  191 ++++++++++++++++++++++++++++++++++++++++++
  11  3 files changed, 200 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 @@ -74,3 +74,11 @@ config SAMSUNG_USBPHY
  17         help
  18           Enable this to support Samsung USB phy controller for samsung
  19           SoCs.
  20 +
  21 +config RALINK_USBPHY
  22 +       bool "Ralink USB PHY controller Driver"
  23 +       depends on MIPS && RALINK
  24 +       select USB_OTG_UTILS
  25 +       help
  26 +         Enable this to support ralink USB phy controller for ralink
  27 +         SoCs.
  28 --- a/drivers/usb/phy/Makefile
  29 +++ b/drivers/usb/phy/Makefile
  30 @@ -12,3 +12,4 @@ obj-$(CONFIG_MV_U3D_PHY)              += mv_u3d_phy.
  31  obj-$(CONFIG_USB_EHCI_TEGRA)   += tegra_usb_phy.o
  32  obj-$(CONFIG_USB_RCAR_PHY)             += rcar-phy.o
  33  obj-$(CONFIG_SAMSUNG_USBPHY)           += samsung-usbphy.o
  34 +obj-$(CONFIG_RALINK_USBPHY)            += ralink-phy.o
  35 --- /dev/null
  36 +++ b/drivers/usb/phy/ralink-phy.c
  37 @@ -0,0 +1,191 @@
  38 +/*
  39 + * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
  40 + *
  41 + * based on: Renesas R-Car USB phy driver
  42 + *
  43 + * This program is free software; you can redistribute it and/or modify
  44 + * it under the terms of the GNU General Public License version 2 as
  45 + * published by the Free Software Foundation.
  46 + */
  47 +
  48 +#include <linux/delay.h>
  49 +#include <linux/io.h>
  50 +#include <linux/usb/otg.h>
  51 +#include <linux/of_platform.h>
  52 +#include <linux/platform_device.h>
  53 +#include <linux/spinlock.h>
  54 +#include <linux/module.h>
  55 +#include <linux/reset.h>
  56 +
  57 +#include <asm/mach-ralink/ralink_regs.h>
  58 +
  59 +#define RT_SYSC_REG_SYSCFG1            0x014
  60 +#define RT_SYSC_REG_CLKCFG1            0x030
  61 +#define RT_SYSC_REG_USB_PHY_CFG        0x05c
  62 +
  63 +#define RT_RSTCTRL_UDEV                BIT(25)
  64 +#define RT_RSTCTRL_UHST                BIT(22)
  65 +#define RT_SYSCFG1_USB0_HOST_MODE      BIT(10)
  66 +
  67 +#define MT7620_CLKCFG1_UPHY0_CLK_EN    BIT(25)
  68 +#define RT_CLKCFG1_UPHY1_CLK_EN        BIT(20)
  69 +#define RT_CLKCFG1_UPHY0_CLK_EN        BIT(18)
  70 +
  71 +#define USB_PHY_UTMI_8B60M             BIT(1)
  72 +#define UDEV_WAKEUP                    BIT(0)
  73 +
  74 +static atomic_t usb_pwr_ref = ATOMIC_INIT(0);
  75 +static struct reset_control *rstdev;
  76 +static struct reset_control *rsthost;
  77 +static u32 phy_clk;
  78 +
  79 +static void usb_phy_enable(int state)
  80 +{
  81 +       if (state)
  82 +               rt_sysc_m32(0, phy_clk, RT_SYSC_REG_CLKCFG1);
  83 +       else
  84 +               rt_sysc_m32(phy_clk, 0, RT_SYSC_REG_CLKCFG1);
  85 +       mdelay(100);
  86 +}
  87 +
  88 +static int usb_power_on(struct usb_phy *phy)
  89 +{
  90 +       if (atomic_inc_return(&usb_pwr_ref) == 1) {
  91 +               u32 t;
  92 +
  93 +               usb_phy_enable(1);
  94 +
  95 +//             reset_control_assert(rstdev);
  96 +//             reset_control_assert(rsthost);
  97 +
  98 +               if (OTG_STATE_B_HOST) {
  99 +                       rt_sysc_m32(0, RT_SYSCFG1_USB0_HOST_MODE, RT_SYSC_REG_SYSCFG1);
 100 +                       reset_control_deassert(rsthost);
 101 +               } else {
 102 +                       rt_sysc_m32(RT_SYSCFG1_USB0_HOST_MODE, 0, RT_SYSC_REG_SYSCFG1);
 103 +                       reset_control_deassert(rstdev);
 104 +               }
 105 +               mdelay(100);
 106 +
 107 +               t = rt_sysc_r32(RT_SYSC_REG_USB_PHY_CFG);
 108 +               dev_info(phy->dev, "remote usb device wakeup %s\n",
 109 +                               (t & UDEV_WAKEUP) ? ("enabbled") : ("disabled"));
 110 +               if (t & USB_PHY_UTMI_8B60M)
 111 +                       dev_info(phy->dev, "UTMI 8bit 60MHz\n");
 112 +               else
 113 +                       dev_info(phy->dev, "UTMI 16bit 30MHz\n");
 114 +       }
 115 +
 116 +       return 0;
 117 +}
 118 +
 119 +static void usb_power_off(struct usb_phy *phy)
 120 +{
 121 +       if (atomic_dec_return(&usb_pwr_ref) == 0) {
 122 +               usb_phy_enable(0);
 123 +               reset_control_assert(rstdev);
 124 +               reset_control_assert(rsthost);
 125 +       }
 126 +}
 127 +
 128 +static int usb_set_host(struct usb_otg *otg, struct usb_bus *host)
 129 +{
 130 +       otg->gadget = NULL;
 131 +       otg->host = host;
 132 +
 133 +       return 0;
 134 +}
 135 +
 136 +static int usb_set_peripheral(struct usb_otg *otg,
 137 +               struct usb_gadget *gadget)
 138 +{
 139 +       otg->host = NULL;
 140 +       otg->gadget = gadget;
 141 +
 142 +       return 0;
 143 +}
 144 +
 145 +static const struct of_device_id ralink_usbphy_dt_match[] = {
 146 +       { .compatible = "ralink,rt3xxx-usbphy", .data = (void *) (RT_CLKCFG1_UPHY1_CLK_EN | RT_CLKCFG1_UPHY0_CLK_EN) },
 147 +       { .compatible = "ralink,mt7620a-usbphy", .data = (void *) MT7620_CLKCFG1_UPHY0_CLK_EN },
 148 +       {},
 149 +};
 150 +MODULE_DEVICE_TABLE(of, ralink_usbphy_dt_match);
 151 +
 152 +static int usb_phy_probe(struct platform_device *pdev)
 153 +{
 154 +       const struct of_device_id *match;
 155 +       struct device *dev = &pdev->dev;
 156 +       struct usb_otg *otg;
 157 +       struct usb_phy *phy;
 158 +       int ret;
 159 +
 160 +       match = of_match_device(ralink_usbphy_dt_match, &pdev->dev);
 161 +       phy_clk = (int) match->data;
 162 +
 163 +       rsthost = devm_reset_control_get(&pdev->dev, "host");
 164 +       if (IS_ERR(rsthost))
 165 +               return PTR_ERR(rsthost);
 166 +
 167 +       rstdev = devm_reset_control_get(&pdev->dev, "device");
 168 +       if (IS_ERR(rstdev))
 169 +               return PTR_ERR(rstdev);
 170 +
 171 +       phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
 172 +       if (!phy) {
 173 +               dev_err(&pdev->dev, "unable to allocate memory for USB PHY\n");
 174 +               return -ENOMEM;
 175 +       }
 176 +
 177 +       otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
 178 +       if (!otg) {
 179 +               dev_err(&pdev->dev, "unable to allocate memory for USB OTG\n");
 180 +               return -ENOMEM;
 181 +       }
 182 +
 183 +       phy->dev = dev;
 184 +       phy->label = dev_name(dev);
 185 +       phy->init = usb_power_on;
 186 +       phy->shutdown = usb_power_off;
 187 +       otg->set_host = usb_set_host;
 188 +       otg->set_peripheral = usb_set_peripheral;
 189 +       otg->phy = phy;
 190 +       phy->otg = otg;
 191 +       ret = usb_add_phy(phy, USB_PHY_TYPE_USB2);
 192 +
 193 +       if (ret < 0) {
 194 +               dev_err(dev, "usb phy addition error\n");
 195 +               return ret;
 196 +       }
 197 +
 198 +       platform_set_drvdata(pdev, phy);
 199 +
 200 +       dev_info(&pdev->dev, "loaded\n");
 201 +
 202 +       return ret;
 203 +}
 204 +
 205 +static int usb_phy_remove(struct platform_device *pdev)
 206 +{
 207 +       struct usb_phy *phy = platform_get_drvdata(pdev);
 208 +
 209 +       usb_remove_phy(phy);
 210 +
 211 +       return 0;
 212 +}
 213 +
 214 +static struct platform_driver usb_phy_driver = {
 215 +       .driver         = {
 216 +               .owner  = THIS_MODULE,
 217 +               .name   = "rt3xxx-usbphy",
 218 +               .of_match_table = of_match_ptr(ralink_usbphy_dt_match),
 219 +       },
 220 +       .probe          = usb_phy_probe,
 221 +       .remove         = usb_phy_remove,
 222 +};
 223 +
 224 +module_platform_driver(usb_phy_driver);
 225 +
 226 +MODULE_LICENSE("GPL v2");
 227 +MODULE_DESCRIPTION("Ralink USB phy");
 228 +MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");