target/linux/ramips/patches-3.10/0018-USB-phy-add-ralink-SoC-driver.patch

   1 From c5f51197b13fd312324ac0486a46e530e163eade Mon Sep 17 00:00:00 2001
   2 From: John Crispin <blogic@openwrt.org>
   3 Date: Sun, 14 Jul 2013 23:31:19 +0200
   4 Subject: [PATCH 18/33] 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 @@ -210,4 +210,12 @@ config USB_ULPI_VIEWPORT
  17           Provides read/write operations to the ULPI phy register set for
  18           controllers with a viewport register (e.g. Chipidea/ARC controllers).
  19
  20 +config RALINK_USBPHY
  21 +       bool "Ralink USB PHY controller Driver"
  22 +       depends on MIPS && RALINK
  23 +       select USB_OTG_UTILS
  24 +       help
  25 +         Enable this to support ralink USB phy controller for ralink
  26 +         SoCs.
  27 +
  28  endif # USB_PHY
  29 --- a/drivers/usb/phy/Makefile
  30 +++ b/drivers/usb/phy/Makefile
  31 @@ -31,3 +31,4 @@ obj-$(CONFIG_USB_MXS_PHY)             += phy-mxs-us
  32  obj-$(CONFIG_USB_RCAR_PHY)             += phy-rcar-usb.o
  33  obj-$(CONFIG_USB_ULPI)                 += phy-ulpi.o
  34  obj-$(CONFIG_USB_ULPI_VIEWPORT)                += phy-ulpi-viewport.o
  35 +obj-$(CONFIG_RALINK_USBPHY)            += ralink-phy.o
  36 --- /dev/null
  37 +++ b/drivers/usb/phy/ralink-phy.c
  38 @@ -0,0 +1,191 @@
  39 +/*
  40 + * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
  41 + *
  42 + * based on: Renesas R-Car USB phy driver
  43 + *
  44 + * This program is free software; you can redistribute it and/or modify
  45 + * it under the terms of the GNU General Public License version 2 as
  46 + * published by the Free Software Foundation.
  47 + */
  48 +
  49 +#include <linux/delay.h>
  50 +#include <linux/io.h>
  51 +#include <linux/usb/otg.h>
  52 +#include <linux/of_platform.h>
  53 +#include <linux/platform_device.h>
  54 +#include <linux/spinlock.h>
  55 +#include <linux/module.h>
  56 +#include <linux/reset.h>
  57 +
  58 +#include <asm/mach-ralink/ralink_regs.h>
  59 +
  60 +#define RT_SYSC_REG_SYSCFG1            0x014
  61 +#define RT_SYSC_REG_CLKCFG1            0x030
  62 +#define RT_SYSC_REG_USB_PHY_CFG        0x05c
  63 +
  64 +#define RT_RSTCTRL_UDEV                BIT(25)
  65 +#define RT_RSTCTRL_UHST                BIT(22)
  66 +#define RT_SYSCFG1_USB0_HOST_MODE      BIT(10)
  67 +
  68 +#define MT7620_CLKCFG1_UPHY0_CLK_EN    BIT(25)
  69 +#define RT_CLKCFG1_UPHY1_CLK_EN        BIT(20)
  70 +#define RT_CLKCFG1_UPHY0_CLK_EN        BIT(18)
  71 +
  72 +#define USB_PHY_UTMI_8B60M             BIT(1)
  73 +#define UDEV_WAKEUP                    BIT(0)
  74 +
  75 +static atomic_t usb_pwr_ref = ATOMIC_INIT(0);
  76 +static struct reset_control *rstdev;
  77 +static struct reset_control *rsthost;
  78 +static u32 phy_clk;
  79 +
  80 +static void usb_phy_enable(int state)
  81 +{
  82 +       if (state)
  83 +               rt_sysc_m32(0, phy_clk, RT_SYSC_REG_CLKCFG1);
  84 +       else
  85 +               rt_sysc_m32(phy_clk, 0, RT_SYSC_REG_CLKCFG1);
  86 +       mdelay(100);
  87 +}
  88 +
  89 +static int usb_power_on(struct usb_phy *phy)
  90 +{
  91 +       if (atomic_inc_return(&usb_pwr_ref) == 1) {
  92 +               u32 t;
  93 +
  94 +               usb_phy_enable(1);
  95 +
  96 +//             reset_control_assert(rstdev);
  97 +//             reset_control_assert(rsthost);
  98 +
  99 +               if (OTG_STATE_B_HOST) {
 100 +                       rt_sysc_m32(0, RT_SYSCFG1_USB0_HOST_MODE, RT_SYSC_REG_SYSCFG1);
 101 +                       reset_control_deassert(rsthost);
 102 +               } else {
 103 +                       rt_sysc_m32(RT_SYSCFG1_USB0_HOST_MODE, 0, RT_SYSC_REG_SYSCFG1);
 104 +                       reset_control_deassert(rstdev);
 105 +               }
 106 +               mdelay(100);
 107 +
 108 +               t = rt_sysc_r32(RT_SYSC_REG_USB_PHY_CFG);
 109 +               dev_info(phy->dev, "remote usb device wakeup %s\n",
 110 +                               (t & UDEV_WAKEUP) ? ("enabbled") : ("disabled"));
 111 +               if (t & USB_PHY_UTMI_8B60M)
 112 +                       dev_info(phy->dev, "UTMI 8bit 60MHz\n");
 113 +               else
 114 +                       dev_info(phy->dev, "UTMI 16bit 30MHz\n");
 115 +       }
 116 +
 117 +       return 0;
 118 +}
 119 +
 120 +static void usb_power_off(struct usb_phy *phy)
 121 +{
 122 +       if (atomic_dec_return(&usb_pwr_ref) == 0) {
 123 +               usb_phy_enable(0);
 124 +               reset_control_assert(rstdev);
 125 +               reset_control_assert(rsthost);
 126 +       }
 127 +}
 128 +
 129 +static int usb_set_host(struct usb_otg *otg, struct usb_bus *host)
 130 +{
 131 +       otg->gadget = NULL;
 132 +       otg->host = host;
 133 +
 134 +       return 0;
 135 +}
 136 +
 137 +static int usb_set_peripheral(struct usb_otg *otg,
 138 +               struct usb_gadget *gadget)
 139 +{
 140 +       otg->host = NULL;
 141 +       otg->gadget = gadget;
 142 +
 143 +       return 0;
 144 +}
 145 +
 146 +static const struct of_device_id ralink_usbphy_dt_match[] = {
 147 +       { .compatible = "ralink,rt3xxx-usbphy", .data = (void *) (RT_CLKCFG1_UPHY1_CLK_EN | RT_CLKCFG1_UPHY0_CLK_EN) },
 148 +       { .compatible = "ralink,mt7620a-usbphy", .data = (void *) MT7620_CLKCFG1_UPHY0_CLK_EN },
 149 +       {},
 150 +};
 151 +MODULE_DEVICE_TABLE(of, ralink_usbphy_dt_match);
 152 +
 153 +static int usb_phy_probe(struct platform_device *pdev)
 154 +{
 155 +       const struct of_device_id *match;
 156 +       struct device *dev = &pdev->dev;
 157 +       struct usb_otg *otg;
 158 +       struct usb_phy *phy;
 159 +       int ret;
 160 +
 161 +       match = of_match_device(ralink_usbphy_dt_match, &pdev->dev);
 162 +       phy_clk = (int) match->data;
 163 +
 164 +       rsthost = devm_reset_control_get(&pdev->dev, "host");
 165 +       if (IS_ERR(rsthost))
 166 +               return PTR_ERR(rsthost);
 167 +
 168 +       rstdev = devm_reset_control_get(&pdev->dev, "device");
 169 +       if (IS_ERR(rstdev))
 170 +               return PTR_ERR(rstdev);
 171 +
 172 +       phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
 173 +       if (!phy) {
 174 +               dev_err(&pdev->dev, "unable to allocate memory for USB PHY\n");
 175 +               return -ENOMEM;
 176 +       }
 177 +
 178 +       otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
 179 +       if (!otg) {
 180 +               dev_err(&pdev->dev, "unable to allocate memory for USB OTG\n");
 181 +               return -ENOMEM;
 182 +       }
 183 +
 184 +       phy->dev = dev;
 185 +       phy->label = dev_name(dev);
 186 +       phy->init = usb_power_on;
 187 +       phy->shutdown = usb_power_off;
 188 +       otg->set_host = usb_set_host;
 189 +       otg->set_peripheral = usb_set_peripheral;
 190 +       otg->phy = phy;
 191 +       phy->otg = otg;
 192 +       ret = usb_add_phy(phy, USB_PHY_TYPE_USB2);
 193 +
 194 +       if (ret < 0) {
 195 +               dev_err(dev, "usb phy addition error\n");
 196 +               return ret;
 197 +       }
 198 +
 199 +       platform_set_drvdata(pdev, phy);
 200 +
 201 +       dev_info(&pdev->dev, "loaded\n");
 202 +
 203 +       return ret;
 204 +}
 205 +
 206 +static int usb_phy_remove(struct platform_device *pdev)
 207 +{
 208 +       struct usb_phy *phy = platform_get_drvdata(pdev);
 209 +
 210 +       usb_remove_phy(phy);
 211 +
 212 +       return 0;
 213 +}
 214 +
 215 +static struct platform_driver usb_phy_driver = {
 216 +       .driver         = {
 217 +               .owner  = THIS_MODULE,
 218 +               .name   = "rt3xxx-usbphy",
 219 +               .of_match_table = of_match_ptr(ralink_usbphy_dt_match),
 220 +       },
 221 +       .probe          = usb_phy_probe,
 222 +       .remove         = usb_phy_remove,
 223 +};
 224 +
 225 +module_platform_driver(usb_phy_driver);
 226 +
 227 +MODULE_LICENSE("GPL v2");
 228 +MODULE_DESCRIPTION("Ralink USB phy");
 229 +MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");