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         int ret;
  67         struct mxs_phy *mxs_phy = to_mxs_phy(phy);
  68
  69         ret = clk_prepare_enable(mxs_phy->clk);
  70         if (ret)
  71                 return ret;
  72
  73         return mxs_phy_hw_init(mxs_phy);
  74 }
  75
  76 static void mxs_phy_shutdown(struct usb_phy *phy)
  77 {
  78         struct mxs_phy *mxs_phy = to_mxs_phy(phy);
  79
  80         writel(BM_USBPHY_CTRL_CLKGATE,
  81                phy->io_priv + HW_USBPHY_CTRL_SET);
  82
  83         clk_disable_unprepare(mxs_phy->clk);
  84 }
  85
  86 static int mxs_phy_suspend(struct usb_phy *x, int suspend)
  87 {
  88         int ret;
  89         struct mxs_phy *mxs_phy = to_mxs_phy(x);
  90
  91         if (suspend) {
  92                 writel(0xffffffff, x->io_priv + HW_USBPHY_PWD);
  93                 writel(BM_USBPHY_CTRL_CLKGATE,
  94                        x->io_priv + HW_USBPHY_CTRL_SET);
  95                 clk_disable_unprepare(mxs_phy->clk);
  96         } else {
  97                 ret = clk_prepare_enable(mxs_phy->clk);
  98                 if (ret)
  99                         return ret;
 100                 writel(BM_USBPHY_CTRL_CLKGATE,
 101                        x->io_priv + HW_USBPHY_CTRL_CLR);
 102                 writel(0, x->io_priv + HW_USBPHY_PWD);
 103         }
 104
 105         return 0;
 106 }
 107
 108 static int mxs_phy_on_connect(struct usb_phy *phy,
 109                 enum usb_device_speed speed)
 110 {
 111         dev_dbg(phy->dev, "%s speed device has connected\n",
 112                 (speed == USB_SPEED_HIGH) ? "high" : "non-high");
 113
 114         if (speed == USB_SPEED_HIGH)
 115                 writel(BM_USBPHY_CTRL_ENHOSTDISCONDETECT,
 116                        phy->io_priv + HW_USBPHY_CTRL_SET);
 117
 118         return 0;
 119 }
 120
 121 static int mxs_phy_on_disconnect(struct usb_phy *phy,
 122                 enum usb_device_speed speed)
 123 {
 124         dev_dbg(phy->dev, "%s speed device has disconnected\n",
 125                 (speed == USB_SPEED_HIGH) ? "high" : "non-high");
 126
 127         if (speed == USB_SPEED_HIGH)
 128                 writel(BM_USBPHY_CTRL_ENHOSTDISCONDETECT,
 129                        phy->io_priv + HW_USBPHY_CTRL_CLR);
 130
 131         return 0;
 132 }
 133
 134 static int mxs_phy_probe(struct platform_device *pdev)
 135 {
 136         struct resource *res;
 137         void __iomem *base;
 138         struct clk *clk;
 139         struct mxs_phy *mxs_phy;
 140         int ret;
 141
 142         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 143         base = devm_ioremap_resource(&pdev->dev, res);
 144         if (IS_ERR(base))
 145                 return PTR_ERR(base);
 146
 147         clk = devm_clk_get(&pdev->dev, NULL);
 148         if (IS_ERR(clk)) {
 149                 dev_err(&pdev->dev,
 150                         "can't get the clock, err=%ld", PTR_ERR(clk));
 151                 return PTR_ERR(clk);
 152         }
 153
 154         mxs_phy = devm_kzalloc(&pdev->dev, sizeof(*mxs_phy), GFP_KERNEL);
 155         if (!mxs_phy) {
 156                 dev_err(&pdev->dev, "Failed to allocate USB PHY structure!\n");
 157                 return -ENOMEM;
 158         }
 159
 160         mxs_phy->phy.io_priv            = base;
 161         mxs_phy->phy.dev                = &pdev->dev;
 162         mxs_phy->phy.label              = DRIVER_NAME;
 163         mxs_phy->phy.init               = mxs_phy_init;
 164         mxs_phy->phy.shutdown           = mxs_phy_shutdown;
 165         mxs_phy->phy.set_suspend        = mxs_phy_suspend;
 166         mxs_phy->phy.notify_connect     = mxs_phy_on_connect;
 167         mxs_phy->phy.notify_disconnect  = mxs_phy_on_disconnect;
 168         mxs_phy->phy.type               = USB_PHY_TYPE_USB2;
 169
 170         ATOMIC_INIT_NOTIFIER_HEAD(&mxs_phy->phy.notifier);
 171
 172         mxs_phy->clk = clk;
 173
 174         platform_set_drvdata(pdev, &mxs_phy->phy);
 175
 176         ret = usb_add_phy_dev(&mxs_phy->phy);
 177         if (ret)
 178                 return ret;
 179
 180         return 0;
 181 }
 182
 183 static int mxs_phy_remove(struct platform_device *pdev)
 184 {
 185         struct mxs_phy *mxs_phy = platform_get_drvdata(pdev);
 186
 187         usb_remove_phy(&mxs_phy->phy);
 188
 189         return 0;
 190 }
 191
 192 static const struct of_device_id mxs_phy_dt_ids[] = {
 193         { .compatible = "fsl,imx23-usbphy", },
 194         { /* sentinel */ }
 195 };
 196 MODULE_DEVICE_TABLE(of, mxs_phy_dt_ids);
 197
 198 static struct platform_driver mxs_phy_driver = {
 199         .probe = mxs_phy_probe,
 200         .remove = mxs_phy_remove,
 201         .driver = {
 202                 .name = DRIVER_NAME,
 203                 .owner  = THIS_MODULE,
 204                 .of_match_table = mxs_phy_dt_ids,
 205          },
 206 };
 207
 208 static int __init mxs_phy_module_init(void)
 209 {
 210         return platform_driver_register(&mxs_phy_driver);
 211 }
 212 postcore_initcall(mxs_phy_module_init);
 213
 214 static void __exit mxs_phy_module_exit(void)
 215 {
 216         platform_driver_unregister(&mxs_phy_driver);
 217 }
 218 module_exit(mxs_phy_module_exit);
 219
 220 MODULE_ALIAS("platform:mxs-usb-phy");
 221 MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
 222 MODULE_AUTHOR("Richard Zhao <richard.zhao@freescale.com>");
 223 MODULE_DESCRIPTION("Freescale MXS USB PHY driver");
 224 MODULE_LICENSE("GPL");