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
  35 /*-------------------------------------------------------------------------*/
  36
  37 static int ohci_omap3_init(struct usb_hcd *hcd)
  38 {
  39         dev_dbg(hcd->self.controller, "starting OHCI controller\n");
  40
  41         return ohci_init(hcd_to_ohci(hcd));
  42 }
  43
  44 /*-------------------------------------------------------------------------*/
  45
  46 static int ohci_omap3_start(struct usb_hcd *hcd)
  47 {
  48         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
  49         int ret;
  50
  51         /*
  52          * RemoteWakeupConnected has to be set explicitly before
  53          * calling ohci_run. The reset value of RWC is 0.
  54          */
  55         ohci->hc_control = OHCI_CTRL_RWC;
  56         writel(OHCI_CTRL_RWC, &ohci->regs->control);
  57
  58         ret = ohci_run(ohci);
  59
  60         if (ret < 0) {
  61                 dev_err(hcd->self.controller, "can't start\n");
  62                 ohci_stop(hcd);
  63         }
  64
  65         return ret;
  66 }
  67
  68 /*-------------------------------------------------------------------------*/
  69
  70 static const struct hc_driver ohci_omap3_hc_driver = {
  71         .description =          hcd_name,
  72         .product_desc =         "OMAP3 OHCI Host Controller",
  73         .hcd_priv_size =        sizeof(struct ohci_hcd),
  74
  75         /*
  76          * generic hardware linkage
  77          */
  78         .irq =                  ohci_irq,
  79         .flags =                HCD_USB11 | HCD_MEMORY,
  80
  81         /*
  82          * basic lifecycle operations
  83          */
  84         .reset =                ohci_omap3_init,
  85         .start =                ohci_omap3_start,
  86         .stop =                 ohci_stop,
  87         .shutdown =             ohci_shutdown,
  88
  89         /*
  90          * managing i/o requests and associated device resources
  91          */
  92         .urb_enqueue =          ohci_urb_enqueue,
  93         .urb_dequeue =          ohci_urb_dequeue,
  94         .endpoint_disable =     ohci_endpoint_disable,
  95
  96         /*
  97          * scheduling support
  98          */
  99         .get_frame_number =     ohci_get_frame,
 100
 101         /*
 102          * root hub support
 103          */
 104         .hub_status_data =      ohci_hub_status_data,
 105         .hub_control =          ohci_hub_control,
 106 #ifdef  CONFIG_PM
 107         .bus_suspend =          ohci_bus_suspend,
 108         .bus_resume =           ohci_bus_resume,
 109 #endif
 110         .start_port_reset =     ohci_start_port_reset,
 111 };
 112
 113 /*-------------------------------------------------------------------------*/
 114
 115 /*
 116  * configure so an HC device and id are always provided
 117  * always called with process context; sleeping is OK
 118  */
 119
 120 /**
 121  * ohci_hcd_omap3_probe - initialize OMAP-based HCDs
 122  *
 123  * Allocates basic resources for this USB host controller, and
 124  * then invokes the start() method for the HCD associated with it
 125  * through the hotplug entry's driver_data.
 126  */
 127 static int __devinit ohci_hcd_omap3_probe(struct platform_device *pdev)
 128 {
 129         struct device           *dev = &pdev->dev;
 130         struct usb_hcd          *hcd = NULL;
 131         void __iomem            *regs = NULL;
 132         struct resource         *res;
 133         int                     ret = -ENODEV;
 134         int                     irq;
 135
 136         if (usb_disabled())
 137                 goto err_end;
 138
 139         if (!dev->parent) {
 140                 dev_err(dev, "Missing parent device\n");
 141                 return -ENODEV;
 142         }
 143
 144         irq = platform_get_irq_byname(pdev, "ohci-irq");
 145         if (irq < 0) {
 146                 dev_err(dev, "OHCI irq failed\n");
 147                 return -ENODEV;
 148         }
 149
 150         res = platform_get_resource_byname(pdev,
 151                                 IORESOURCE_MEM, "ohci");
 152         if (!res) {
 153                 dev_err(dev, "UHH OHCI get resource failed\n");
 154                 return -ENOMEM;
 155         }
 156
 157         regs = ioremap(res->start, resource_size(res));
 158         if (!regs) {
 159                 dev_err(dev, "UHH OHCI ioremap failed\n");
 160                 return -ENOMEM;
 161         }
 162
 163
 164         hcd = usb_create_hcd(&ohci_omap3_hc_driver, dev,
 165                         dev_name(dev));
 166         if (!hcd) {
 167                 dev_err(dev, "usb_create_hcd failed\n");
 168                 goto err_io;
 169         }
 170
 171         hcd->rsrc_start = res->start;
 172         hcd->rsrc_len = resource_size(res);
 173         hcd->regs =  regs;
 174
 175         ret = omap_usbhs_enable(dev);
 176         if (ret) {
 177                 dev_dbg(dev, "failed to start ohci\n");
 178                 goto err_end;
 179         }
 180
 181         ohci_hcd_init(hcd_to_ohci(hcd));
 182
 183         ret = usb_add_hcd(hcd, irq, IRQF_DISABLED);
 184         if (ret) {
 185                 dev_dbg(dev, "failed to add hcd with err %d\n", ret);
 186                 goto err_add_hcd;
 187         }
 188
 189         return 0;
 190
 191 err_add_hcd:
 192         omap_usbhs_disable(dev);
 193
 194 err_end:
 195         usb_put_hcd(hcd);
 196
 197 err_io:
 198         iounmap(regs);
 199
 200         return ret;
 201 }
 202
 203 /*
 204  * may be called without controller electrically present
 205  * may be called with controller, bus, and devices active
 206  */
 207
 208 /**
 209  * ohci_hcd_omap3_remove - shutdown processing for OHCI HCDs
 210  * @pdev: USB Host Controller being removed
 211  *
 212  * Reverses the effect of ohci_hcd_omap3_probe(), first invoking
 213  * the HCD's stop() method.  It is always called from a thread
 214  * context, normally "rmmod", "apmd", or something similar.
 215  */
 216 static int __devexit ohci_hcd_omap3_remove(struct platform_device *pdev)
 217 {
 218         struct device *dev      = &pdev->dev;
 219         struct usb_hcd *hcd     = dev_get_drvdata(dev);
 220
 221         iounmap(hcd->regs);
 222         usb_remove_hcd(hcd);
 223         omap_usbhs_disable(dev);
 224         usb_put_hcd(hcd);
 225
 226         return 0;
 227 }
 228
 229 static void ohci_hcd_omap3_shutdown(struct platform_device *pdev)
 230 {
 231         struct usb_hcd *hcd = dev_get_drvdata(&pdev->dev);
 232
 233         if (hcd->driver->shutdown)
 234                 hcd->driver->shutdown(hcd);
 235 }
 236
 237 static struct platform_driver ohci_hcd_omap3_driver = {
 238         .probe          = ohci_hcd_omap3_probe,
 239         .remove         = __devexit_p(ohci_hcd_omap3_remove),
 240         .shutdown       = ohci_hcd_omap3_shutdown,
 241         .driver         = {
 242                 .name   = "ohci-omap3",
 243         },
 244 };
 245
 246 MODULE_ALIAS("platform:ohci-omap3");
 247 MODULE_AUTHOR("Anand Gadiyar <gadiyar@ti.com>");