drivers/usb/host/ohci-omap3.c

   1 /*
   2  * ohci-omap3.c - driver for OHCI on OMAP3 and later processors
   3  *
   4  * Bus Glue for OMAP3 USBHOST 3 port OHCI controller
   5  * This controller is also used in later OMAPs and AM35x chips
   6  *
   7  * Copyright (C) 2007-2010 Texas Instruments, Inc.
   8  * Author: Vikram Pandita <vikram.pandita@ti.com>
   9  * Author: Anand Gadiyar <gadiyar@ti.com>
  10  * Author: Keshava Munegowda <keshava_mgowda@ti.com>
  11  *
  12  * Based on ehci-omap.c and some other ohci glue layers
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2 of the License, or
  17  * (at your option) any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program; if not, write to the Free Software
  26  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  27  *
  28  * TODO (last updated Feb 27, 2011):
  29  *      - add kernel-doc
  30  */
  31
  32 #include <linux/platform_device.h>
  33 #include <plat/usb.h>
  34 #include <linux/pm_runtime.h>
  35
  36 /*-------------------------------------------------------------------------*/
  37
  38 static int ohci_omap3_init(struct usb_hcd *hcd)
  39 {
  40         dev_dbg(hcd->self.controller, "starting OHCI controller\n");
  41
  42         return ohci_init(hcd_to_ohci(hcd));
  43 }
  44
  45 /*-------------------------------------------------------------------------*/
  46
  47 static int ohci_omap3_start(struct usb_hcd *hcd)
  48 {
  49         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
  50         int ret;
  51
  52         /*
  53          * RemoteWakeupConnected has to be set explicitly before
  54          * calling ohci_run. The reset value of RWC is 0.
  55          */
  56         ohci->hc_control = OHCI_CTRL_RWC;
  57         writel(OHCI_CTRL_RWC, &ohci->regs->control);
  58
  59         ret = ohci_run(ohci);
  60
  61         if (ret < 0) {
  62                 dev_err(hcd->self.controller, "can't start\n");
  63                 ohci_stop(hcd);
  64         }
  65
  66         return ret;
  67 }
  68
  69 /*-------------------------------------------------------------------------*/
  70
  71 static const struct hc_driver ohci_omap3_hc_driver = {
  72         .description =          hcd_name,
  73         .product_desc =         "OMAP3 OHCI Host Controller",
  74         .hcd_priv_size =        sizeof(struct ohci_hcd),
  75
  76         /*
  77          * generic hardware linkage
  78          */
  79         .irq =                  ohci_irq,
  80         .flags =                HCD_USB11 | HCD_MEMORY,
  81
  82         /*
  83          * basic lifecycle operations
  84          */
  85         .reset =                ohci_omap3_init,
  86         .start =                ohci_omap3_start,
  87         .stop =                 ohci_stop,
  88         .shutdown =             ohci_shutdown,
  89
  90         /*
  91          * managing i/o requests and associated device resources
  92          */
  93         .urb_enqueue =          ohci_urb_enqueue,
  94         .urb_dequeue =          ohci_urb_dequeue,
  95         .endpoint_disable =     ohci_endpoint_disable,
  96
  97         /*
  98          * scheduling support
  99          */
 100         .get_frame_number =     ohci_get_frame,
 101
 102         /*
 103          * root hub support
 104          */
 105         .hub_status_data =      ohci_hub_status_data,
 106         .hub_control =          ohci_hub_control,
 107 #ifdef  CONFIG_PM
 108         .bus_suspend =          ohci_bus_suspend,
 109         .bus_resume =           ohci_bus_resume,
 110 #endif
 111         .start_port_reset =     ohci_start_port_reset,
 112 };
 113
 114 /*-------------------------------------------------------------------------*/
 115
 116 /*
 117  * configure so an HC device and id are always provided
 118  * always called with process context; sleeping is OK
 119  */
 120
 121 /**
 122  * ohci_hcd_omap3_probe - initialize OMAP-based HCDs
 123  *
 124  * Allocates basic resources for this USB host controller, and
 125  * then invokes the start() method for the HCD associated with it
 126  * through the hotplug entry's driver_data.
 127  */
 128 static int __devinit ohci_hcd_omap3_probe(struct platform_device *pdev)
 129 {
 130         struct device           *dev = &pdev->dev;
 131         struct usb_hcd          *hcd = NULL;
 132         void __iomem            *regs = NULL;
 133         struct resource         *res;
 134         int                     ret = -ENODEV;
 135         int                     irq;
 136
 137         if (usb_disabled())
 138                 return -ENODEV;
 139
 140         if (!dev->parent) {
 141                 dev_err(dev, "Missing parent device\n");
 142                 return -ENODEV;
 143         }
 144
 145         irq = platform_get_irq_byname(pdev, "ohci-irq");
 146         if (irq < 0) {
 147                 dev_err(dev, "OHCI irq failed\n");
 148                 return -ENODEV;
 149         }
 150
 151         res = platform_get_resource_byname(pdev,
 152                                 IORESOURCE_MEM, "ohci");
 153         if (!res) {
 154                 dev_err(dev, "UHH OHCI get resource failed\n");
 155                 return -ENOMEM;
 156         }
 157
 158         regs = ioremap(res->start, resource_size(res));
 159         if (!regs) {
 160                 dev_err(dev, "UHH OHCI ioremap failed\n");
 161                 return -ENOMEM;
 162         }
 163
 164
 165         hcd = usb_create_hcd(&ohci_omap3_hc_driver, dev,
 166                         dev_name(dev));
 167         if (!hcd) {
 168                 dev_err(dev, "usb_create_hcd failed\n");
 169                 goto err_io;
 170         }
 171
 172         hcd->rsrc_start = res->start;
 173         hcd->rsrc_len = resource_size(res);
 174         hcd->regs =  regs;
 175
 176         pm_runtime_enable(dev);
 177         pm_runtime_get_sync(dev);
 178
 179         ohci_hcd_init(hcd_to_ohci(hcd));
 180
 181         ret = usb_add_hcd(hcd, irq, 0);
 182         if (ret) {
 183                 dev_dbg(dev, "failed to add hcd with err %d\n", ret);
 184                 goto err_add_hcd;
 185         }
 186
 187         return 0;
 188
 189 err_add_hcd:
 190         pm_runtime_put_sync(dev);
 191         usb_put_hcd(hcd);
 192
 193 err_io:
 194         iounmap(regs);
 195
 196         return ret;
 197 }
 198
 199 /*
 200  * may be called without controller electrically present
 201  * may be called with controller, bus, and devices active
 202  */
 203
 204 /**
 205  * ohci_hcd_omap3_remove - shutdown processing for OHCI HCDs
 206  * @pdev: USB Host Controller being removed
 207  *
 208  * Reverses the effect of ohci_hcd_omap3_probe(), first invoking
 209  * the HCD's stop() method.  It is always called from a thread
 210  * context, normally "rmmod", "apmd", or something similar.
 211  */
 212 static int __devexit ohci_hcd_omap3_remove(struct platform_device *pdev)
 213 {
 214         struct device *dev      = &pdev->dev;
 215         struct usb_hcd *hcd     = dev_get_drvdata(dev);
 216
 217         iounmap(hcd->regs);
 218         usb_remove_hcd(hcd);
 219         pm_runtime_put_sync(dev);
 220         pm_runtime_disable(dev);
 221         usb_put_hcd(hcd);
 222         return 0;
 223 }
 224
 225 static void ohci_hcd_omap3_shutdown(struct platform_device *pdev)
 226 {
 227         struct usb_hcd *hcd = dev_get_drvdata(&pdev->dev);
 228
 229         if (hcd->driver->shutdown)
 230                 hcd->driver->shutdown(hcd);
 231 }
 232
 233 static struct platform_driver ohci_hcd_omap3_driver = {
 234         .probe          = ohci_hcd_omap3_probe,
 235         .remove         = __devexit_p(ohci_hcd_omap3_remove),
 236         .shutdown       = ohci_hcd_omap3_shutdown,
 237         .driver         = {
 238                 .name   = "ohci-omap3",
 239         },
 240 };
 241
 242 MODULE_ALIAS("platform:ohci-omap3");
 243 MODULE_AUTHOR("Anand Gadiyar <gadiyar@ti.com>");