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         if (!res) {
  73                 dev_err(dev, "Found HC with no register addr. Check setup!\n");
  74                 ret = -ENODEV;
  75                 goto err_alloc;
  76         }
  77
  78         hcd->rsrc_start = res->start;
  79         hcd->rsrc_len = resource_size(res);
  80
  81         hcd->regs = devm_ioremap_resource(&pdev->dev, res);
  82         if (IS_ERR(hcd->regs)) {
  83                 ret = PTR_ERR(hcd->regs);
  84                 goto err_alloc;
  85         }
  86
  87         hcd->has_tt = 1;
  88         ehci = hcd_to_ehci(hcd);
  89         priv = (struct ehci_mxc_priv *) ehci->priv;
  90
  91         /* enable clocks */
  92         priv->usbclk = devm_clk_get(&pdev->dev, "ipg");
  93         if (IS_ERR(priv->usbclk)) {
  94                 ret = PTR_ERR(priv->usbclk);
  95                 goto err_alloc;
  96         }
  97         clk_prepare_enable(priv->usbclk);
  98
  99         priv->ahbclk = devm_clk_get(&pdev->dev, "ahb");
 100         if (IS_ERR(priv->ahbclk)) {
 101                 ret = PTR_ERR(priv->ahbclk);
 102                 goto err_clk_ahb;
 103         }
 104         clk_prepare_enable(priv->ahbclk);
 105
 106         /* "dr" device has its own clock on i.MX51 */
 107         priv->phyclk = devm_clk_get(&pdev->dev, "phy");
 108         if (IS_ERR(priv->phyclk))
 109                 priv->phyclk = NULL;
 110         if (priv->phyclk)
 111                 clk_prepare_enable(priv->phyclk);
 112
 113
 114         /* call platform specific init function */
 115         if (pdata->init) {
 116                 ret = pdata->init(pdev);
 117                 if (ret) {
 118                         dev_err(dev, "platform init failed\n");
 119                         goto err_init;
 120                 }
 121                 /* platforms need some time to settle changed IO settings */
 122                 mdelay(10);
 123         }
 124
 125         /* EHCI registers start at offset 0x100 */
 126         ehci->caps = hcd->regs + 0x100;
 127         ehci->regs = hcd->regs + 0x100 +
 128                 HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
 129
 130         /* set up the PORTSCx register */
 131         ehci_writel(ehci, pdata->portsc, &ehci->regs->port_status[0]);
 132
 133         /* is this really needed? */
 134         msleep(10);
 135
 136         /* Initialize the transceiver */
 137         if (pdata->otg) {
 138                 pdata->otg->io_priv = hcd->regs + ULPI_VIEWPORT_OFFSET;
 139                 ret = usb_phy_init(pdata->otg);
 140                 if (ret) {
 141                         dev_err(dev, "unable to init transceiver, probably missing\n");
 142                         ret = -ENODEV;
 143                         goto err_add;
 144                 }
 145                 ret = otg_set_vbus(pdata->otg->otg, 1);
 146                 if (ret) {
 147                         dev_err(dev, "unable to enable vbus on transceiver\n");
 148                         goto err_add;
 149                 }
 150         }
 151
 152         platform_set_drvdata(pdev, hcd);
 153
 154         ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
 155         if (ret)
 156                 goto err_add;
 157
 158         return 0;
 159
 160 err_add:
 161         if (pdata && pdata->exit)
 162                 pdata->exit(pdev);
 163 err_init:
 164         if (priv->phyclk)
 165                 clk_disable_unprepare(priv->phyclk);
 166
 167         clk_disable_unprepare(priv->ahbclk);
 168 err_clk_ahb:
 169         clk_disable_unprepare(priv->usbclk);
 170 err_alloc:
 171         usb_put_hcd(hcd);
 172         return ret;
 173 }
 174
 175 static int ehci_mxc_drv_remove(struct platform_device *pdev)
 176 {
 177         struct mxc_usbh_platform_data *pdata = dev_get_platdata(&pdev->dev);
 178         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 179         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 180         struct ehci_mxc_priv *priv = (struct ehci_mxc_priv *) ehci->priv;
 181
 182         usb_remove_hcd(hcd);
 183
 184         if (pdata && pdata->exit)
 185                 pdata->exit(pdev);
 186
 187         if (pdata && pdata->otg)
 188                 usb_phy_shutdown(pdata->otg);
 189
 190         clk_disable_unprepare(priv->usbclk);
 191         clk_disable_unprepare(priv->ahbclk);
 192
 193         if (priv->phyclk)
 194                 clk_disable_unprepare(priv->phyclk);
 195
 196         usb_put_hcd(hcd);
 197         return 0;
 198 }
 199
 200 MODULE_ALIAS("platform:mxc-ehci");
 201
 202 static struct platform_driver ehci_mxc_driver = {
 203         .probe = ehci_mxc_drv_probe,
 204         .remove = ehci_mxc_drv_remove,
 205         .shutdown = usb_hcd_platform_shutdown,
 206         .driver = {
 207                    .name = "mxc-ehci",
 208         },
 209 };
 210
 211 static int __init ehci_mxc_init(void)
 212 {
 213         if (usb_disabled())
 214                 return -ENODEV;
 215
 216         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
 217
 218         ehci_init_driver(&ehci_mxc_hc_driver, &ehci_mxc_overrides);
 219         return platform_driver_register(&ehci_mxc_driver);
 220 }
 221 module_init(ehci_mxc_init);
 222
 223 static void __exit ehci_mxc_cleanup(void)
 224 {
 225         platform_driver_unregister(&ehci_mxc_driver);
 226 }
 227 module_exit(ehci_mxc_cleanup);
 228
 229 MODULE_DESCRIPTION(DRIVER_DESC);
 230 MODULE_AUTHOR("Sascha Hauer");
 231 MODULE_LICENSE("GPL");