drivers/usb/host/ohci-au1xxx.c

   1 /*
   2  * OHCI HCD (Host Controller Driver) for USB.
   3  *
   4  * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
   5  * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
   6  * (C) Copyright 2002 Hewlett-Packard Company
   7  *
   8  * Bus Glue for AMD Alchemy Au1xxx
   9  *
  10  * Written by Christopher Hoover <ch@hpl.hp.com>
  11  * Based on fragments of previous driver by Russell King et al.
  12  *
  13  * Modified for LH7A404 from ohci-sa1111.c
  14  *  by Durgesh Pattamatta <pattamattad@sharpsec.com>
  15  * Modified for AMD Alchemy Au1xxx
  16  *  by Matt Porter <mporter@kernel.crashing.org>
  17  *
  18  * This file is licenced under the GPL.
  19  */
  20
  21 #include <linux/platform_device.h>
  22 #include <linux/signal.h>
  23
  24 #include <asm/mach-au1x00/au1000.h>
  25
  26
  27 extern int usb_disabled(void);
  28
  29 static int __devinit ohci_au1xxx_start(struct usb_hcd *hcd)
  30 {
  31         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
  32         int ret;
  33
  34         ohci_dbg(ohci, "ohci_au1xxx_start, ohci:%p", ohci);
  35
  36         if ((ret = ohci_init(ohci)) < 0)
  37                 return ret;
  38
  39         if ((ret = ohci_run(ohci)) < 0) {
  40                 err ("can't start %s", hcd->self.bus_name);
  41                 ohci_stop(hcd);
  42                 return ret;
  43         }
  44
  45         return 0;
  46 }
  47
  48 static const struct hc_driver ohci_au1xxx_hc_driver = {
  49         .description =          hcd_name,
  50         .product_desc =         "Au1xxx OHCI",
  51         .hcd_priv_size =        sizeof(struct ohci_hcd),
  52
  53         /*
  54          * generic hardware linkage
  55          */
  56         .irq =                  ohci_irq,
  57         .flags =                HCD_USB11 | HCD_MEMORY,
  58
  59         /*
  60          * basic lifecycle operations
  61          */
  62         .start =                ohci_au1xxx_start,
  63         .stop =                 ohci_stop,
  64         .shutdown =             ohci_shutdown,
  65
  66         /*
  67          * managing i/o requests and associated device resources
  68          */
  69         .urb_enqueue =          ohci_urb_enqueue,
  70         .urb_dequeue =          ohci_urb_dequeue,
  71         .endpoint_disable =     ohci_endpoint_disable,
  72
  73         /*
  74          * scheduling support
  75          */
  76         .get_frame_number =     ohci_get_frame,
  77
  78         /*
  79          * root hub support
  80          */
  81         .hub_status_data =      ohci_hub_status_data,
  82         .hub_control =          ohci_hub_control,
  83 #ifdef  CONFIG_PM
  84         .bus_suspend =          ohci_bus_suspend,
  85         .bus_resume =           ohci_bus_resume,
  86 #endif
  87         .start_port_reset =     ohci_start_port_reset,
  88 };
  89
  90 static int ohci_hcd_au1xxx_drv_probe(struct platform_device *pdev)
  91 {
  92         int ret;
  93         struct usb_hcd *hcd;
  94
  95         if (usb_disabled())
  96                 return -ENODEV;
  97
  98         if (pdev->resource[1].flags != IORESOURCE_IRQ) {
  99                 pr_debug("resource[1] is not IORESOURCE_IRQ\n");
 100                 return -ENOMEM;
 101         }
 102
 103         hcd = usb_create_hcd(&ohci_au1xxx_hc_driver, &pdev->dev, "au1xxx");
 104         if (!hcd)
 105                 return -ENOMEM;
 106
 107         hcd->rsrc_start = pdev->resource[0].start;
 108         hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1;
 109
 110         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 111                 pr_debug("request_mem_region failed\n");
 112                 ret = -EBUSY;
 113                 goto err1;
 114         }
 115
 116         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 117         if (!hcd->regs) {
 118                 pr_debug("ioremap failed\n");
 119                 ret = -ENOMEM;
 120                 goto err2;
 121         }
 122
 123         if (alchemy_usb_control(ALCHEMY_USB_OHCI0, 1)) {
 124                 printk(KERN_INFO "%s: controller init failed!\n", pdev->name);
 125                 ret = -ENODEV;
 126                 goto err3;
 127         }
 128
 129         ohci_hcd_init(hcd_to_ohci(hcd));
 130
 131         ret = usb_add_hcd(hcd, pdev->resource[1].start,
 132                           IRQF_SHARED);
 133         if (ret == 0) {
 134                 platform_set_drvdata(pdev, hcd);
 135                 return ret;
 136         }
 137
 138         alchemy_usb_control(ALCHEMY_USB_OHCI0, 0);
 139 err3:
 140         iounmap(hcd->regs);
 141 err2:
 142         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 143 err1:
 144         usb_put_hcd(hcd);
 145         return ret;
 146 }
 147
 148 static int ohci_hcd_au1xxx_drv_remove(struct platform_device *pdev)
 149 {
 150         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 151
 152         usb_remove_hcd(hcd);
 153         alchemy_usb_control(ALCHEMY_USB_OHCI0, 0);
 154         iounmap(hcd->regs);
 155         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 156         usb_put_hcd(hcd);
 157         platform_set_drvdata(pdev, NULL);
 158
 159         return 0;
 160 }
 161
 162 #ifdef CONFIG_PM
 163 static int ohci_hcd_au1xxx_drv_suspend(struct device *dev)
 164 {
 165         struct usb_hcd *hcd = dev_get_drvdata(dev);
 166         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 167         unsigned long flags;
 168         int rc;
 169
 170         rc = 0;
 171
 172         /* Root hub was already suspended. Disable irq emission and
 173          * mark HW unaccessible, bail out if RH has been resumed. Use
 174          * the spinlock to properly synchronize with possible pending
 175          * RH suspend or resume activity.
 176          *
 177          * This is still racy as hcd->state is manipulated outside of
 178          * any locks =P But that will be a different fix.
 179          */
 180         spin_lock_irqsave(&ohci->lock, flags);
 181         if (hcd->state != HC_STATE_SUSPENDED) {
 182                 rc = -EINVAL;
 183                 goto bail;
 184         }
 185         ohci_writel(ohci, OHCI_INTR_MIE, &ohci->regs->intrdisable);
 186         (void)ohci_readl(ohci, &ohci->regs->intrdisable);
 187
 188         clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
 189
 190         alchemy_usb_control(ALCHEMY_USB_OHCI0, 0);
 191 bail:
 192         spin_unlock_irqrestore(&ohci->lock, flags);
 193
 194         return rc;
 195 }
 196
 197 static int ohci_hcd_au1xxx_drv_resume(struct device *dev)
 198 {
 199         struct usb_hcd *hcd = dev_get_drvdata(dev);
 200
 201         alchemy_usb_control(ALCHEMY_USB_OHCI0, 1);
 202
 203         set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
 204         ohci_finish_controller_resume(hcd);
 205
 206         return 0;
 207 }
 208
 209 static const struct dev_pm_ops au1xxx_ohci_pmops = {
 210         .suspend        = ohci_hcd_au1xxx_drv_suspend,
 211         .resume         = ohci_hcd_au1xxx_drv_resume,
 212 };
 213
 214 #define AU1XXX_OHCI_PMOPS &au1xxx_ohci_pmops
 215
 216 #else
 217 #define AU1XXX_OHCI_PMOPS NULL
 218 #endif
 219
 220 static struct platform_driver ohci_hcd_au1xxx_driver = {
 221         .probe          = ohci_hcd_au1xxx_drv_probe,
 222         .remove         = ohci_hcd_au1xxx_drv_remove,
 223         .shutdown       = usb_hcd_platform_shutdown,
 224         .driver         = {
 225                 .name   = "au1xxx-ohci",
 226                 .owner  = THIS_MODULE,
 227                 .pm     = AU1XXX_OHCI_PMOPS,
 228         },
 229 };
 230
 231 MODULE_ALIAS("platform:au1xxx-ohci");