kernel/drivers/usb/host/ehci-mxc.c

   1 /*
   2  * Copyright (c) 2008 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
   3  * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License as published by the
   7  * Free Software Foundation; either version 2 of the License, or (at your
   8  * option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  12  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13  * for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software Foundation,
  17  * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18  */
  19
  20 #include <linux/kernel.h>
  21 #include <linux/module.h>
  22 #include <linux/io.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/clk.h>
  25 #include <linux/delay.h>
  26 #include <linux/usb/otg.h>
  27 #include <linux/usb/ulpi.h>
  28 #include <linux/slab.h>
  29 #include <linux/usb.h>
  30 #include <linux/usb/hcd.h>
  31 #include <linux/platform_data/usb-ehci-mxc.h>
  32 #include "ehci.h"
  33
  34 #define DRIVER_DESC "Freescale On-Chip EHCI Host driver"
  35
  36 static const char hcd_name[] = "ehci-mxc";
  37
  38 #define ULPI_VIEWPORT_OFFSET    0x170
  39
  40 struct ehci_mxc_priv {
  41         struct clk *usbclk, *ahbclk, *phyclk;
  42 };
  43
  44 static struct hc_driver __read_mostly ehci_mxc_hc_driver;
  45
  46 static const struct ehci_driver_overrides ehci_mxc_overrides __initconst = {
  47         .extra_priv_size =      sizeof(struct ehci_mxc_priv),
  48 };
  49
  50 static int ehci_mxc_drv_probe(struct platform_device *pdev)
  51 {
  52         struct mxc_usbh_platform_data *pdata = dev_get_platdata(&pdev->dev);
  53         struct usb_hcd *hcd;
  54         struct resource *res;
  55         int irq, ret;
  56         struct ehci_mxc_priv *priv;
  57         struct device *dev = &pdev->dev;
  58         struct ehci_hcd *ehci;
  59
  60         if (!pdata) {
  61                 dev_err(dev, "No platform data given, bailing out.\n");
  62                 return -EINVAL;
  63         }
  64
  65         irq = platform_get_irq(pdev, 0);
  66
  67         hcd = usb_create_hcd(&ehci_mxc_hc_driver, dev, dev_name(dev));
  68         if (!hcd)
  69                 return -ENOMEM;
  70
  71         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  72         hcd->regs = devm_ioremap_resource(&pdev->dev, res);
  73         if (IS_ERR(hcd->regs)) {
  74                 ret = PTR_ERR(hcd->regs);
  75                 goto err_alloc;
  76         }
  77         hcd->rsrc_start = res->start;
  78         hcd->rsrc_len = resource_size(res);
  79
  80         hcd->has_tt = 1;
  81         ehci = hcd_to_ehci(hcd);
  82         priv = (struct ehci_mxc_priv *) ehci->priv;
  83
  84         /* enable clocks */
  85         priv->usbclk = devm_clk_get(&pdev->dev, "ipg");
  86         if (IS_ERR(priv->usbclk)) {
  87                 ret = PTR_ERR(priv->usbclk);
  88                 goto err_alloc;
  89         }
  90         clk_prepare_enable(priv->usbclk);
  91
  92         priv->ahbclk = devm_clk_get(&pdev->dev, "ahb");
  93         if (IS_ERR(priv->ahbclk)) {
  94                 ret = PTR_ERR(priv->ahbclk);
  95                 goto err_clk_ahb;
  96         }
  97         clk_prepare_enable(priv->ahbclk);
  98
  99         /* "dr" device has its own clock on i.MX51 */
 100         priv->phyclk = devm_clk_get(&pdev->dev, "phy");
 101         if (IS_ERR(priv->phyclk))
 102                 priv->phyclk = NULL;
 103         if (priv->phyclk)
 104                 clk_prepare_enable(priv->phyclk);
 105
 106
 107         /* call platform specific init function */
 108         if (pdata->init) {
 109                 ret = pdata->init(pdev);
 110                 if (ret) {
 111                         dev_err(dev, "platform init failed\n");
 112                         goto err_init;
 113                 }
 114                 /* platforms need some time to settle changed IO settings */
 115                 mdelay(10);
 116         }
 117
 118         /* EHCI registers start at offset 0x100 */
 119         ehci->caps = hcd->regs + 0x100;
 120         ehci->regs = hcd->regs + 0x100 +
 121                 HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
 122
 123         /* set up the PORTSCx register */
 124         ehci_writel(ehci, pdata->portsc, &ehci->regs->port_status[0]);
 125
 126         /* is this really needed? */
 127         msleep(10);
 128
 129         /* Initialize the transceiver */
 130         if (pdata->otg) {
 131                 pdata->otg->io_priv = hcd->regs + ULPI_VIEWPORT_OFFSET;
 132                 ret = usb_phy_init(pdata->otg);
 133                 if (ret) {
 134                         dev_err(dev, "unable to init transceiver, probably missing\n");
 135                         ret = -ENODEV;
 136                         goto err_add;
 137                 }
 138                 ret = otg_set_vbus(pdata->otg->otg, 1);
 139                 if (ret) {
 140                         dev_err(dev, "unable to enable vbus on transceiver\n");
 141                         goto err_add;
 142                 }
 143         }
 144
 145         platform_set_drvdata(pdev, hcd);
 146
 147         ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
 148         if (ret)
 149                 goto err_add;
 150
 151         device_wakeup_enable(hcd->self.controller);
 152         return 0;
 153
 154 err_add:
 155         if (pdata && pdata->exit)
 156                 pdata->exit(pdev);
 157 err_init:
 158         if (priv->phyclk)
 159                 clk_disable_unprepare(priv->phyclk);
 160
 161         clk_disable_unprepare(priv->ahbclk);
 162 err_clk_ahb:
 163         clk_disable_unprepare(priv->usbclk);
 164 err_alloc:
 165         usb_put_hcd(hcd);
 166         return ret;
 167 }
 168
 169 static int ehci_mxc_drv_remove(struct platform_device *pdev)
 170 {
 171         struct mxc_usbh_platform_data *pdata = dev_get_platdata(&pdev->dev);
 172         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 173         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 174         struct ehci_mxc_priv *priv = (struct ehci_mxc_priv *) ehci->priv;
 175
 176         usb_remove_hcd(hcd);
 177
 178         if (pdata && pdata->exit)
 179                 pdata->exit(pdev);
 180
 181         if (pdata && pdata->otg)
 182                 usb_phy_shutdown(pdata->otg);
 183
 184         clk_disable_unprepare(priv->usbclk);
 185         clk_disable_unprepare(priv->ahbclk);
 186
 187         if (priv->phyclk)
 188                 clk_disable_unprepare(priv->phyclk);
 189
 190         usb_put_hcd(hcd);
 191         return 0;
 192 }
 193
 194 MODULE_ALIAS("platform:mxc-ehci");
 195
 196 static struct platform_driver ehci_mxc_driver = {
 197         .probe = ehci_mxc_drv_probe,
 198         .remove = ehci_mxc_drv_remove,
 199         .shutdown = usb_hcd_platform_shutdown,
 200         .driver = {
 201                    .name = "mxc-ehci",
 202         },
 203 };
 204
 205 static int __init ehci_mxc_init(void)
 206 {
 207         if (usb_disabled())
 208                 return -ENODEV;
 209
 210         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
 211
 212         ehci_init_driver(&ehci_mxc_hc_driver, &ehci_mxc_overrides);
 213         return platform_driver_register(&ehci_mxc_driver);
 214 }
 215 module_init(ehci_mxc_init);
 216
 217 static void __exit ehci_mxc_cleanup(void)
 218 {
 219         platform_driver_unregister(&ehci_mxc_driver);
 220 }
 221 module_exit(ehci_mxc_cleanup);
 222
 223 MODULE_DESCRIPTION(DRIVER_DESC);
 224 MODULE_AUTHOR("Sascha Hauer");
 225 MODULE_LICENSE("GPL");