drivers/usb/phy/phy-mxs-usb.c

   1 /*
   2  * Copyright 2012 Freescale Semiconductor, Inc.
   3  * Copyright (C) 2012 Marek Vasut <marex@denx.de>
   4  * on behalf of DENX Software Engineering GmbH
   5  *
   6  * The code contained herein is licensed under the GNU General Public
   7  * License. You may obtain a copy of the GNU General Public License
   8  * Version 2 or later at the following locations:
   9  *
  10  * http://www.opensource.org/licenses/gpl-license.html
  11  * http://www.gnu.org/copyleft/gpl.html
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/kernel.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/clk.h>
  18 #include <linux/usb/otg.h>
  19 #include <linux/stmp_device.h>
  20 #include <linux/delay.h>
  21 #include <linux/err.h>
  22 #include <linux/io.h>
  23
  24 #define DRIVER_NAME "mxs_phy"
  25
  26 #define HW_USBPHY_PWD                           0x00
  27 #define HW_USBPHY_CTRL                          0x30
  28 #define HW_USBPHY_CTRL_SET                      0x34
  29 #define HW_USBPHY_CTRL_CLR                      0x38
  30
  31 #define BM_USBPHY_CTRL_SFTRST                   BIT(31)
  32 #define BM_USBPHY_CTRL_CLKGATE                  BIT(30)
  33 #define BM_USBPHY_CTRL_ENUTMILEVEL3             BIT(15)
  34 #define BM_USBPHY_CTRL_ENUTMILEVEL2             BIT(14)
  35 #define BM_USBPHY_CTRL_ENHOSTDISCONDETECT       BIT(1)
  36
  37 struct mxs_phy {
  38         struct usb_phy phy;
  39         struct clk *clk;
  40 };
  41
  42 #define to_mxs_phy(p) container_of((p), struct mxs_phy, phy)
  43
  44 static int mxs_phy_hw_init(struct mxs_phy *mxs_phy)
  45 {
  46         int ret;
  47         void __iomem *base = mxs_phy->phy.io_priv;
  48
  49         ret = stmp_reset_block(base + HW_USBPHY_CTRL);
  50         if (ret)
  51                 return ret;
  52
  53         /* Power up the PHY */
  54         writel(0, base + HW_USBPHY_PWD);
  55
  56         /* enable FS/LS device */
  57         writel(BM_USBPHY_CTRL_ENUTMILEVEL2 |
  58                BM_USBPHY_CTRL_ENUTMILEVEL3,
  59                base + HW_USBPHY_CTRL_SET);
  60
  61         return 0;
  62 }
  63
  64 static int mxs_phy_init(struct usb_phy *phy)
  65 {
  66         struct mxs_phy *mxs_phy = to_mxs_phy(phy);
  67
  68         clk_prepare_enable(mxs_phy->clk);
  69         return mxs_phy_hw_init(mxs_phy);
  70 }
  71
  72 static void mxs_phy_shutdown(struct usb_phy *phy)
  73 {
  74         struct mxs_phy *mxs_phy = to_mxs_phy(phy);
  75
  76         writel(BM_USBPHY_CTRL_CLKGATE,
  77                phy->io_priv + HW_USBPHY_CTRL_SET);
  78
  79         clk_disable_unprepare(mxs_phy->clk);
  80 }
  81
  82 static int mxs_phy_suspend(struct usb_phy *x, int suspend)
  83 {
  84         struct mxs_phy *mxs_phy = to_mxs_phy(x);
  85
  86         if (suspend) {
  87                 writel(0xffffffff, x->io_priv + HW_USBPHY_PWD);
  88                 writel(BM_USBPHY_CTRL_CLKGATE,
  89                        x->io_priv + HW_USBPHY_CTRL_SET);
  90                 clk_disable_unprepare(mxs_phy->clk);
  91         } else {
  92                 clk_prepare_enable(mxs_phy->clk);
  93                 writel(BM_USBPHY_CTRL_CLKGATE,
  94                        x->io_priv + HW_USBPHY_CTRL_CLR);
  95                 writel(0, x->io_priv + HW_USBPHY_PWD);
  96         }
  97
  98         return 0;
  99 }
 100
 101 static int mxs_phy_on_connect(struct usb_phy *phy,
 102                 enum usb_device_speed speed)
 103 {
 104         dev_dbg(phy->dev, "%s speed device has connected\n",
 105                 (speed == USB_SPEED_HIGH) ? "high" : "non-high");
 106
 107         if (speed == USB_SPEED_HIGH)
 108                 writel(BM_USBPHY_CTRL_ENHOSTDISCONDETECT,
 109                        phy->io_priv + HW_USBPHY_CTRL_SET);
 110
 111         return 0;
 112 }
 113
 114 static int mxs_phy_on_disconnect(struct usb_phy *phy,
 115                 enum usb_device_speed speed)
 116 {
 117         dev_dbg(phy->dev, "%s speed device has disconnected\n",
 118                 (speed == USB_SPEED_HIGH) ? "high" : "non-high");
 119
 120         if (speed == USB_SPEED_HIGH)
 121                 writel(BM_USBPHY_CTRL_ENHOSTDISCONDETECT,
 122                        phy->io_priv + HW_USBPHY_CTRL_CLR);
 123
 124         return 0;
 125 }
 126
 127 static int mxs_phy_probe(struct platform_device *pdev)
 128 {
 129         struct resource *res;
 130         void __iomem *base;
 131         struct clk *clk;
 132         struct mxs_phy *mxs_phy;
 133         int ret;
 134
 135         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 136         base = devm_ioremap_resource(&pdev->dev, res);
 137         if (IS_ERR(base))
 138                 return PTR_ERR(base);
 139
 140         clk = devm_clk_get(&pdev->dev, NULL);
 141         if (IS_ERR(clk)) {
 142                 dev_err(&pdev->dev,
 143                         "can't get the clock, err=%ld", PTR_ERR(clk));
 144                 return PTR_ERR(clk);
 145         }
 146
 147         mxs_phy = devm_kzalloc(&pdev->dev, sizeof(*mxs_phy), GFP_KERNEL);
 148         if (!mxs_phy) {
 149                 dev_err(&pdev->dev, "Failed to allocate USB PHY structure!\n");
 150                 return -ENOMEM;
 151         }
 152
 153         mxs_phy->phy.io_priv            = base;
 154         mxs_phy->phy.dev                = &pdev->dev;
 155         mxs_phy->phy.label              = DRIVER_NAME;
 156         mxs_phy->phy.init               = mxs_phy_init;
 157         mxs_phy->phy.shutdown           = mxs_phy_shutdown;
 158         mxs_phy->phy.set_suspend        = mxs_phy_suspend;
 159         mxs_phy->phy.notify_connect     = mxs_phy_on_connect;
 160         mxs_phy->phy.notify_disconnect  = mxs_phy_on_disconnect;
 161         mxs_phy->phy.type               = USB_PHY_TYPE_USB2;
 162
 163         ATOMIC_INIT_NOTIFIER_HEAD(&mxs_phy->phy.notifier);
 164
 165         mxs_phy->clk = clk;
 166
 167         platform_set_drvdata(pdev, &mxs_phy->phy);
 168
 169         ret = usb_add_phy_dev(&mxs_phy->phy);
 170         if (ret)
 171                 return ret;
 172
 173         return 0;
 174 }
 175
 176 static int mxs_phy_remove(struct platform_device *pdev)
 177 {
 178         struct mxs_phy *mxs_phy = platform_get_drvdata(pdev);
 179
 180         usb_remove_phy(&mxs_phy->phy);
 181
 182         return 0;
 183 }
 184
 185 static const struct of_device_id mxs_phy_dt_ids[] = {
 186         { .compatible = "fsl,imx23-usbphy", },
 187         { /* sentinel */ }
 188 };
 189 MODULE_DEVICE_TABLE(of, mxs_phy_dt_ids);
 190
 191 static struct platform_driver mxs_phy_driver = {
 192         .probe = mxs_phy_probe,
 193         .remove = mxs_phy_remove,
 194         .driver = {
 195                 .name = DRIVER_NAME,
 196                 .owner  = THIS_MODULE,
 197                 .of_match_table = mxs_phy_dt_ids,
 198          },
 199 };
 200
 201 static int __init mxs_phy_module_init(void)
 202 {
 203         return platform_driver_register(&mxs_phy_driver);
 204 }
 205 postcore_initcall(mxs_phy_module_init);
 206
 207 static void __exit mxs_phy_module_exit(void)
 208 {
 209         platform_driver_unregister(&mxs_phy_driver);
 210 }
 211 module_exit(mxs_phy_module_exit);
 212
 213 MODULE_ALIAS("platform:mxs-usb-phy");
 214 MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
 215 MODULE_AUTHOR("Richard Zhao <richard.zhao@freescale.com>");
 216 MODULE_DESCRIPTION("Freescale MXS USB PHY driver");
 217 MODULE_LICENSE("GPL");