drivers/usb/phy/phy-rcar-usb.c

   1 /*
   2  * Renesas R-Car USB phy driver
   3  *
   4  * Copyright (C) 2012-2013 Renesas Solutions Corp.
   5  * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
   6  * Copyright (C) 2013 Cogent Embedded, Inc.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #include <linux/delay.h>
  14 #include <linux/io.h>
  15 #include <linux/usb/otg.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/spinlock.h>
  18 #include <linux/module.h>
  19 #include <linux/platform_data/usb-rcar-phy.h>
  20
  21 /* REGS block */
  22 #define USBPCTRL0       0x00
  23 #define USBPCTRL1       0x04
  24 #define USBST           0x08
  25 #define USBEH0          0x0C
  26 #define USBOH0          0x1C
  27 #define USBCTL0         0x58
  28
  29 /* High-speed signal quality characteristic control registers (R8A7778 only) */
  30 #define HSQCTL1         0x24
  31 #define HSQCTL2         0x28
  32
  33 /* USBPCTRL0 */
  34 #define OVC2            (1 << 10) /* (R8A7779 only)                     */
  35                                 /* Switches the OVC input pin for port 2: */
  36                                 /* 1: USB_OVC2, 0: OVC2                 */
  37 #define OVC1_VBUS1      (1 << 9) /* Switches the OVC input pin for port 1: */
  38                                 /* 1: USB_OVC1, 0: OVC1/VBUS1           */
  39                                 /* Function mode: set to 0              */
  40 #define OVC0            (1 << 8) /* Switches the OVC input pin for port 0: */
  41                                 /* 1: USB_OVC0 pin, 0: OVC0             */
  42 #define OVC2_ACT        (1 << 6) /* (R8A7779 only)                      */
  43                                 /* Host mode: OVC2 polarity:            */
  44                                 /* 1: active-high, 0: active-low        */
  45 #define PENC            (1 << 4) /* Function mode: output level of PENC1 pin: */
  46                                 /* 1: high, 0: low                      */
  47 #define OVC0_ACT        (1 << 3) /* Host mode: OVC0 polarity:           */
  48                                 /* 1: active-high, 0: active-low        */
  49 #define OVC1_ACT        (1 << 1) /* Host mode: OVC1 polarity:           */
  50                                 /* 1: active-high, 0: active-low        */
  51                                 /* Function mode: be sure to set to 1   */
  52 #define PORT1           (1 << 0) /* Selects port 1 mode:                */
  53                                 /* 1: function, 0: host                 */
  54 /* USBPCTRL1 */
  55 #define PHY_RST         (1 << 2)
  56 #define PLL_ENB         (1 << 1)
  57 #define PHY_ENB         (1 << 0)
  58
  59 /* USBST */
  60 #define ST_ACT          (1 << 31)
  61 #define ST_PLL          (1 << 30)
  62
  63 struct rcar_usb_phy_priv {
  64         struct usb_phy phy;
  65         spinlock_t lock;
  66
  67         void __iomem *reg0;
  68         void __iomem *reg1;
  69         int counter;
  70 };
  71
  72 #define usb_phy_to_priv(p) container_of(p, struct rcar_usb_phy_priv, phy)
  73
  74
  75 /*
  76  * USB initial/install operation.
  77  *
  78  * This function setup USB phy.
  79  * The used value and setting order came from
  80  * [USB :: Initial setting] on datasheet.
  81  */
  82 static int rcar_usb_phy_init(struct usb_phy *phy)
  83 {
  84         struct rcar_usb_phy_priv *priv = usb_phy_to_priv(phy);
  85         struct device *dev = phy->dev;
  86         struct rcar_phy_platform_data *pdata = dev->platform_data;
  87         void __iomem *reg0 = priv->reg0;
  88         void __iomem *reg1 = priv->reg1;
  89         static const u8 ovcn_act[] = { OVC0_ACT, OVC1_ACT, OVC2_ACT };
  90         int i;
  91         u32 val;
  92         unsigned long flags;
  93
  94         spin_lock_irqsave(&priv->lock, flags);
  95         if (priv->counter++ == 0) {
  96
  97                 /*
  98                  * USB phy start-up
  99                  */
 100
 101                 /* (1) USB-PHY standby release */
 102                 iowrite32(PHY_ENB, (reg0 + USBPCTRL1));
 103
 104                 /* (2) start USB-PHY internal PLL */
 105                 iowrite32(PHY_ENB | PLL_ENB, (reg0 + USBPCTRL1));
 106
 107                 /* (3) set USB-PHY in accord with the conditions of usage */
 108                 if (reg1) {
 109                         u32 hsqctl1 = pdata->ferrite_bead ? 0x41 : 0;
 110                         u32 hsqctl2 = pdata->ferrite_bead ? 0x0d : 7;
 111
 112                         iowrite32(hsqctl1, reg1 + HSQCTL1);
 113                         iowrite32(hsqctl2, reg1 + HSQCTL2);
 114                 }
 115
 116                 /* (4) USB module status check */
 117                 for (i = 0; i < 1024; i++) {
 118                         udelay(10);
 119                         val = ioread32(reg0 + USBST);
 120                         if (val == (ST_ACT | ST_PLL))
 121                                 break;
 122                 }
 123
 124                 if (val != (ST_ACT | ST_PLL)) {
 125                         dev_err(dev, "USB phy not ready\n");
 126                         goto phy_init_end;
 127                 }
 128
 129                 /* (5) USB-PHY reset clear */
 130                 iowrite32(PHY_ENB | PLL_ENB | PHY_RST, (reg0 + USBPCTRL1));
 131
 132                 /* Board specific port settings */
 133                 val = 0;
 134                 if (pdata->port1_func)
 135                         val |= PORT1;
 136                 if (pdata->penc1)
 137                         val |= PENC;
 138                 for (i = 0; i < 3; i++) {
 139                         /* OVCn bits follow each other in the right order */
 140                         if (pdata->ovc_pin[i].select_3_3v)
 141                                 val |= OVC0 << i;
 142                         /* OVCn_ACT bits are spaced by irregular intervals */
 143                         if (pdata->ovc_pin[i].active_high)
 144                                 val |= ovcn_act[i];
 145                 }
 146                 iowrite32(val, (reg0 + USBPCTRL0));
 147
 148                 /*
 149                  * Bus alignment settings
 150                  */
 151
 152                 /* (1) EHCI bus alignment (little endian) */
 153                 iowrite32(0x00000000, (reg0 + USBEH0));
 154
 155                 /* (1) OHCI bus alignment (little endian) */
 156                 iowrite32(0x00000000, (reg0 + USBOH0));
 157         }
 158
 159 phy_init_end:
 160         spin_unlock_irqrestore(&priv->lock, flags);
 161
 162         return 0;
 163 }
 164
 165 static void rcar_usb_phy_shutdown(struct usb_phy *phy)
 166 {
 167         struct rcar_usb_phy_priv *priv = usb_phy_to_priv(phy);
 168         void __iomem *reg0 = priv->reg0;
 169         unsigned long flags;
 170
 171         spin_lock_irqsave(&priv->lock, flags);
 172
 173         if (priv->counter-- == 1)       /* last user */
 174                 iowrite32(0x00000000, (reg0 + USBPCTRL1));
 175
 176         spin_unlock_irqrestore(&priv->lock, flags);
 177 }
 178
 179 static int rcar_usb_phy_probe(struct platform_device *pdev)
 180 {
 181         struct rcar_usb_phy_priv *priv;
 182         struct resource *res0, *res1;
 183         struct device *dev = &pdev->dev;
 184         void __iomem *reg0, *reg1 = NULL;
 185         int ret;
 186
 187         if (!pdev->dev.platform_data) {
 188                 dev_err(dev, "No platform data\n");
 189                 return -EINVAL;
 190         }
 191
 192         res0 = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 193         if (!res0) {
 194                 dev_err(dev, "Not enough platform resources\n");
 195                 return -EINVAL;
 196         }
 197
 198         reg0 = devm_ioremap_resource(dev, res0);
 199         if (IS_ERR(reg0))
 200                 return PTR_ERR(reg0);
 201
 202         res1 = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 203         if (res1) {
 204                 reg1 = devm_ioremap_resource(dev, res1);
 205                 if (IS_ERR(reg1))
 206                         return PTR_ERR(reg1);
 207         }
 208
 209         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 210         if (!priv) {
 211                 dev_err(dev, "priv data allocation error\n");
 212                 return -ENOMEM;
 213         }
 214
 215         priv->reg0              = reg0;
 216         priv->reg1              = reg1;
 217         priv->counter           = 0;
 218         priv->phy.dev           = dev;
 219         priv->phy.label         = dev_name(dev);
 220         priv->phy.init          = rcar_usb_phy_init;
 221         priv->phy.shutdown      = rcar_usb_phy_shutdown;
 222         spin_lock_init(&priv->lock);
 223
 224         ret = usb_add_phy(&priv->phy, USB_PHY_TYPE_USB2);
 225         if (ret < 0) {
 226                 dev_err(dev, "usb phy addition error\n");
 227                 return ret;
 228         }
 229
 230         platform_set_drvdata(pdev, priv);
 231
 232         return ret;
 233 }
 234
 235 static int rcar_usb_phy_remove(struct platform_device *pdev)
 236 {
 237         struct rcar_usb_phy_priv *priv = platform_get_drvdata(pdev);
 238
 239         usb_remove_phy(&priv->phy);
 240
 241         return 0;
 242 }
 243
 244 static struct platform_driver rcar_usb_phy_driver = {
 245         .driver         = {
 246                 .name   = "rcar_usb_phy",
 247         },
 248         .probe          = rcar_usb_phy_probe,
 249         .remove         = rcar_usb_phy_remove,
 250 };
 251
 252 module_platform_driver(rcar_usb_phy_driver);
 253
 254 MODULE_LICENSE("GPL v2");
 255 MODULE_DESCRIPTION("Renesas R-Car USB phy");
 256 MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");