drivers/usb/otg/mxs-phy.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 void mxs_phy_hw_init(struct mxs_phy *mxs_phy)
  45 {
  46         void __iomem *base = mxs_phy->phy.io_priv;
  47
  48         stmp_reset_block(base + HW_USBPHY_CTRL);
  49
  50         /* Power up the PHY */
  51         writel_relaxed(0, base + HW_USBPHY_PWD);
  52
  53         /* enable FS/LS device */
  54         writel_relaxed(BM_USBPHY_CTRL_ENUTMILEVEL2 |
  55                         BM_USBPHY_CTRL_ENUTMILEVEL3,
  56                         base + HW_USBPHY_CTRL_SET);
  57 }
  58
  59 static int mxs_phy_init(struct usb_phy *phy)
  60 {
  61         struct mxs_phy *mxs_phy = to_mxs_phy(phy);
  62
  63         clk_prepare_enable(mxs_phy->clk);
  64         mxs_phy_hw_init(mxs_phy);
  65
  66         return 0;
  67 }
  68
  69 static void mxs_phy_shutdown(struct usb_phy *phy)
  70 {
  71         struct mxs_phy *mxs_phy = to_mxs_phy(phy);
  72
  73         writel_relaxed(BM_USBPHY_CTRL_CLKGATE,
  74                         phy->io_priv + HW_USBPHY_CTRL_SET);
  75
  76         clk_disable_unprepare(mxs_phy->clk);
  77 }
  78
  79 static int mxs_phy_suspend(struct usb_phy *x, int suspend)
  80 {
  81         struct mxs_phy *mxs_phy = to_mxs_phy(x);
  82
  83         if (suspend) {
  84                 writel_relaxed(0xffffffff, x->io_priv + HW_USBPHY_PWD);
  85                 writel_relaxed(BM_USBPHY_CTRL_CLKGATE,
  86                         x->io_priv + HW_USBPHY_CTRL_SET);
  87                 clk_disable_unprepare(mxs_phy->clk);
  88         } else {
  89                 clk_prepare_enable(mxs_phy->clk);
  90                 writel_relaxed(BM_USBPHY_CTRL_CLKGATE,
  91                         x->io_priv + HW_USBPHY_CTRL_CLR);
  92                 writel_relaxed(0, x->io_priv + HW_USBPHY_PWD);
  93         }
  94
  95         return 0;
  96 }
  97
  98 static int mxs_phy_on_connect(struct usb_phy *phy,
  99                 enum usb_device_speed speed)
 100 {
 101         dev_dbg(phy->dev, "%s speed device has connected\n",
 102                 (speed == USB_SPEED_HIGH) ? "high" : "non-high");
 103
 104         if (speed == USB_SPEED_HIGH)
 105                 writel_relaxed(BM_USBPHY_CTRL_ENHOSTDISCONDETECT,
 106                                 phy->io_priv + HW_USBPHY_CTRL_SET);
 107
 108         return 0;
 109 }
 110
 111 static int mxs_phy_on_disconnect(struct usb_phy *phy,
 112                 enum usb_device_speed speed)
 113 {
 114         dev_dbg(phy->dev, "%s speed device has disconnected\n",
 115                 (speed == USB_SPEED_HIGH) ? "high" : "non-high");
 116
 117         if (speed == USB_SPEED_HIGH)
 118                 writel_relaxed(BM_USBPHY_CTRL_ENHOSTDISCONDETECT,
 119                                 phy->io_priv + HW_USBPHY_CTRL_CLR);
 120
 121         return 0;
 122 }
 123
 124 static int mxs_phy_probe(struct platform_device *pdev)
 125 {
 126         struct resource *res;
 127         void __iomem *base;
 128         struct clk *clk;
 129         struct mxs_phy *mxs_phy;
 130
 131         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 132         if (!res) {
 133                 dev_err(&pdev->dev, "can't get device resources\n");
 134                 return -ENOENT;
 135         }
 136
 137         base = devm_ioremap_resource(&pdev->dev, res);
 138         if (IS_ERR(base))
 139                 return PTR_ERR(base);
 140
 141         clk = devm_clk_get(&pdev->dev, NULL);
 142         if (IS_ERR(clk)) {
 143                 dev_err(&pdev->dev,
 144                         "can't get the clock, err=%ld", PTR_ERR(clk));
 145                 return PTR_ERR(clk);
 146         }
 147
 148         mxs_phy = devm_kzalloc(&pdev->dev, sizeof(*mxs_phy), GFP_KERNEL);
 149         if (!mxs_phy) {
 150                 dev_err(&pdev->dev, "Failed to allocate USB PHY structure!\n");
 151                 return -ENOMEM;
 152         }
 153
 154         mxs_phy->phy.io_priv            = base;
 155         mxs_phy->phy.dev                = &pdev->dev;
 156         mxs_phy->phy.label              = DRIVER_NAME;
 157         mxs_phy->phy.init               = mxs_phy_init;
 158         mxs_phy->phy.shutdown           = mxs_phy_shutdown;
 159         mxs_phy->phy.set_suspend        = mxs_phy_suspend;
 160         mxs_phy->phy.notify_connect     = mxs_phy_on_connect;
 161         mxs_phy->phy.notify_disconnect  = mxs_phy_on_disconnect;
 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         return 0;
 170 }
 171
 172 static int mxs_phy_remove(struct platform_device *pdev)
 173 {
 174         platform_set_drvdata(pdev, NULL);
 175
 176         return 0;
 177 }
 178
 179 static const struct of_device_id mxs_phy_dt_ids[] = {
 180         { .compatible = "fsl,imx23-usbphy", },
 181         { /* sentinel */ }
 182 };
 183 MODULE_DEVICE_TABLE(of, mxs_phy_dt_ids);
 184
 185 static struct platform_driver mxs_phy_driver = {
 186         .probe = mxs_phy_probe,
 187         .remove = mxs_phy_remove,
 188         .driver = {
 189                 .name = DRIVER_NAME,
 190                 .owner  = THIS_MODULE,
 191                 .of_match_table = mxs_phy_dt_ids,
 192          },
 193 };
 194
 195 static int __init mxs_phy_module_init(void)
 196 {
 197         return platform_driver_register(&mxs_phy_driver);
 198 }
 199 postcore_initcall(mxs_phy_module_init);
 200
 201 static void __exit mxs_phy_module_exit(void)
 202 {
 203         platform_driver_unregister(&mxs_phy_driver);
 204 }
 205 module_exit(mxs_phy_module_exit);
 206
 207 MODULE_ALIAS("platform:mxs-usb-phy");
 208 MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
 209 MODULE_AUTHOR("Richard Zhao <richard.zhao@freescale.com>");
 210 MODULE_DESCRIPTION("Freescale MXS USB PHY driver");
 211 MODULE_LICENSE("GPL");