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 diff --git a/drivers/usb/phy/Kconfig b/drivers/usb/phy/Kconfig
  15 index 9054938..b197c70 100644
  16 --- a/drivers/usb/phy/Kconfig
  17 +++ b/drivers/usb/phy/Kconfig
  18 @@ -74,3 +74,11 @@ config SAMSUNG_USBPHY
  19         help
  20           Enable this to support Samsung USB phy controller for samsung
  21           SoCs.
  22 +
  23 +config RALINK_USBPHY
  24 +       bool "Ralink USB PHY controller Driver"
  25 +       depends on MIPS && RALINK
  26 +       select USB_OTG_UTILS
  27 +       help
  28 +         Enable this to support ralink USB phy controller for ralink
  29 +         SoCs.
  30 diff --git a/drivers/usb/phy/Makefile b/drivers/usb/phy/Makefile
  31 index b13faa1..2df30f1 100644
  32 --- a/drivers/usb/phy/Makefile
  33 +++ b/drivers/usb/phy/Makefile
  34 @@ -12,3 +12,4 @@ obj-$(CONFIG_MV_U3D_PHY)              += mv_u3d_phy.o
  35  obj-$(CONFIG_USB_EHCI_TEGRA)   += tegra_usb_phy.o
  36  obj-$(CONFIG_USB_RCAR_PHY)             += rcar-phy.o
  37  obj-$(CONFIG_SAMSUNG_USBPHY)           += samsung-usbphy.o
  38 +obj-$(CONFIG_RALINK_USBPHY)            += ralink-phy.o
  39 diff --git a/drivers/usb/phy/ralink-phy.c b/drivers/usb/phy/ralink-phy.c
  40 new file mode 100644
  41 index 0000000..3fbabea
  42 --- /dev/null
  43 +++ b/drivers/usb/phy/ralink-phy.c
  44 @@ -0,0 +1,191 @@
  45 +/*
  46 + * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
  47 + *
  48 + * based on: Renesas R-Car USB phy driver
  49 + *
  50 + * This program is free software; you can redistribute it and/or modify
  51 + * it under the terms of the GNU General Public License version 2 as
  52 + * published by the Free Software Foundation.
  53 + */
  54 +
  55 +#include <linux/delay.h>
  56 +#include <linux/io.h>
  57 +#include <linux/usb/otg.h>
  58 +#include <linux/of_platform.h>
  59 +#include <linux/platform_device.h>
  60 +#include <linux/spinlock.h>
  61 +#include <linux/module.h>
  62 +#include <linux/reset.h>
  63 +
  64 +#include <asm/mach-ralink/ralink_regs.h>
  65 +
  66 +#define RT_SYSC_REG_SYSCFG1            0x014
  67 +#define RT_SYSC_REG_CLKCFG1            0x030
  68 +#define RT_SYSC_REG_USB_PHY_CFG        0x05c
  69 +
  70 +#define RT_RSTCTRL_UDEV                BIT(25)
  71 +#define RT_RSTCTRL_UHST                BIT(22)
  72 +#define RT_SYSCFG1_USB0_HOST_MODE      BIT(10)
  73 +
  74 +#define MT7620_CLKCFG1_UPHY0_CLK_EN    BIT(25)
  75 +#define RT_CLKCFG1_UPHY1_CLK_EN        BIT(20)
  76 +#define RT_CLKCFG1_UPHY0_CLK_EN        BIT(18)
  77 +
  78 +#define USB_PHY_UTMI_8B60M             BIT(1)
  79 +#define UDEV_WAKEUP                    BIT(0)
  80 +
  81 +static atomic_t usb_pwr_ref = ATOMIC_INIT(0);
  82 +static struct reset_control *rstdev;
  83 +static struct reset_control *rsthost;
  84 +static u32 phy_clk;
  85 +
  86 +static void usb_phy_enable(int state)
  87 +{
  88 +       if (state)
  89 +               rt_sysc_m32(0, phy_clk, RT_SYSC_REG_CLKCFG1);
  90 +       else
  91 +               rt_sysc_m32(phy_clk, 0, RT_SYSC_REG_CLKCFG1);
  92 +       mdelay(100);
  93 +}
  94 +
  95 +static int usb_power_on(struct usb_phy *phy)
  96 +{
  97 +       if (atomic_inc_return(&usb_pwr_ref) == 1) {
  98 +               u32 t;
  99 +
 100 +               usb_phy_enable(1);
 101 +
 102 +               reset_control_assert(rstdev);
 103 +               reset_control_assert(rsthost);
 104 +
 105 +               if (OTG_STATE_B_HOST) {
 106 +                       rt_sysc_m32(0, RT_SYSCFG1_USB0_HOST_MODE, RT_SYSC_REG_SYSCFG1);
 107 +                       reset_control_deassert(rsthost);
 108 +               } else {
 109 +                       rt_sysc_m32(RT_SYSCFG1_USB0_HOST_MODE, 0, RT_SYSC_REG_SYSCFG1);
 110 +                       reset_control_deassert(rstdev);
 111 +               }
 112 +               mdelay(100);
 113 +
 114 +               t = rt_sysc_r32(RT_SYSC_REG_USB_PHY_CFG);
 115 +               dev_info(phy->dev, "remote usb device wakeup %s\n",
 116 +                               (t & UDEV_WAKEUP) ? ("enabbled") : ("disabled"));
 117 +               if (t & USB_PHY_UTMI_8B60M)
 118 +                       dev_info(phy->dev, "UTMI 8bit 60MHz\n");
 119 +               else
 120 +                       dev_info(phy->dev, "UTMI 16bit 30MHz\n");
 121 +       }
 122 +
 123 +       return 0;
 124 +}
 125 +
 126 +static void usb_power_off(struct usb_phy *phy)
 127 +{
 128 +       if (atomic_dec_return(&usb_pwr_ref) == 0) {
 129 +               usb_phy_enable(0);
 130 +               reset_control_assert(rstdev);
 131 +               reset_control_assert(rsthost);
 132 +       }
 133 +}
 134 +
 135 +static int usb_set_host(struct usb_otg *otg, struct usb_bus *host)
 136 +{
 137 +       otg->gadget = NULL;
 138 +       otg->host = host;
 139 +
 140 +       return 0;
 141 +}
 142 +
 143 +static int usb_set_peripheral(struct usb_otg *otg,
 144 +               struct usb_gadget *gadget)
 145 +{
 146 +       otg->host = NULL;
 147 +       otg->gadget = gadget;
 148 +
 149 +       return 0;
 150 +}
 151 +
 152 +static const struct of_device_id ralink_usbphy_dt_match[] = {
 153 +       { .compatible = "ralink,rt3xxx-usbphy", .data = (void *) (RT_CLKCFG1_UPHY1_CLK_EN | RT_CLKCFG1_UPHY0_CLK_EN) },
 154 +       { .compatible = "ralink,mt7620a-usbphy", .data = (void *) MT7620_CLKCFG1_UPHY0_CLK_EN },
 155 +       {},
 156 +};
 157 +MODULE_DEVICE_TABLE(of, ralink_usbphy_dt_match);
 158 +
 159 +static int usb_phy_probe(struct platform_device *pdev)
 160 +{
 161 +       const struct of_device_id *match;
 162 +       struct device *dev = &pdev->dev;
 163 +       struct usb_otg *otg;
 164 +       struct usb_phy *phy;
 165 +       int ret;
 166 +
 167 +       match = of_match_device(ralink_usbphy_dt_match, &pdev->dev);
 168 +       phy_clk = (int) match->data;
 169 +
 170 +       rsthost = devm_reset_control_get(&pdev->dev, "host");
 171 +       if (IS_ERR(rsthost))
 172 +               return PTR_ERR(rsthost);
 173 +
 174 +       rstdev = devm_reset_control_get(&pdev->dev, "device");
 175 +       if (IS_ERR(rstdev))
 176 +               return PTR_ERR(rstdev);
 177 +
 178 +       phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
 179 +       if (!phy) {
 180 +               dev_err(&pdev->dev, "unable to allocate memory for USB PHY\n");
 181 +               return -ENOMEM;
 182 +       }
 183 +
 184 +       otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
 185 +       if (!otg) {
 186 +               dev_err(&pdev->dev, "unable to allocate memory for USB OTG\n");
 187 +               return -ENOMEM;
 188 +       }
 189 +
 190 +       phy->dev = dev;
 191 +       phy->label = dev_name(dev);
 192 +       phy->init = usb_power_on;
 193 +       phy->shutdown = usb_power_off;
 194 +       otg->set_host = usb_set_host;
 195 +       otg->set_peripheral = usb_set_peripheral;
 196 +       otg->phy = phy;
 197 +       phy->otg = otg;
 198 +       ret = usb_add_phy(phy, USB_PHY_TYPE_USB2);
 199 +
 200 +       if (ret < 0) {
 201 +               dev_err(dev, "usb phy addition error\n");
 202 +               return ret;
 203 +       }
 204 +
 205 +       platform_set_drvdata(pdev, phy);
 206 +
 207 +       dev_info(&pdev->dev, "loaded\n");
 208 +
 209 +       return ret;
 210 +}
 211 +
 212 +static int usb_phy_remove(struct platform_device *pdev)
 213 +{
 214 +       struct usb_phy *phy = platform_get_drvdata(pdev);
 215 +
 216 +       usb_remove_phy(phy);
 217 +
 218 +       return 0;
 219 +}
 220 +
 221 +static struct platform_driver usb_phy_driver = {
 222 +       .driver         = {
 223 +               .owner  = THIS_MODULE,
 224 +               .name   = "rt3xxx-usbphy",
 225 +               .of_match_table = of_match_ptr(ralink_usbphy_dt_match),
 226 +       },
 227 +       .probe          = usb_phy_probe,
 228 +       .remove         = usb_phy_remove,
 229 +};
 230 +
 231 +module_platform_driver(usb_phy_driver);
 232 +
 233 +MODULE_LICENSE("GPL v2");
 234 +MODULE_DESCRIPTION("Ralink USB phy");
 235 +MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
 236 --
 237 1.7.10.4
 238