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                 dev_err(hcd->self.controller, "can't start %s",
  41                         hcd->self.bus_name);
  42                 ohci_stop(hcd);
  43                 return ret;
  44         }
  45
  46         return 0;
  47 }
  48
  49 static const struct hc_driver ohci_au1xxx_hc_driver = {
  50         .description =          hcd_name,
  51         .product_desc =         "Au1xxx OHCI",
  52         .hcd_priv_size =        sizeof(struct ohci_hcd),
  53
  54         /*
  55          * generic hardware linkage
  56          */
  57         .irq =                  ohci_irq,
  58         .flags =                HCD_USB11 | HCD_MEMORY,
  59
  60         /*
  61          * basic lifecycle operations
  62          */
  63         .start =                ohci_au1xxx_start,
  64         .stop =                 ohci_stop,
  65         .shutdown =             ohci_shutdown,
  66
  67         /*
  68          * managing i/o requests and associated device resources
  69          */
  70         .urb_enqueue =          ohci_urb_enqueue,
  71         .urb_dequeue =          ohci_urb_dequeue,
  72         .endpoint_disable =     ohci_endpoint_disable,
  73
  74         /*
  75          * scheduling support
  76          */
  77         .get_frame_number =     ohci_get_frame,
  78
  79         /*
  80          * root hub support
  81          */
  82         .hub_status_data =      ohci_hub_status_data,
  83         .hub_control =          ohci_hub_control,
  84 #ifdef  CONFIG_PM
  85         .bus_suspend =          ohci_bus_suspend,
  86         .bus_resume =           ohci_bus_resume,
  87 #endif
  88         .start_port_reset =     ohci_start_port_reset,
  89 };
  90
  91 static int ohci_hcd_au1xxx_drv_probe(struct platform_device *pdev)
  92 {
  93         int ret, unit;
  94         struct usb_hcd *hcd;
  95
  96         if (usb_disabled())
  97                 return -ENODEV;
  98
  99         if (pdev->resource[1].flags != IORESOURCE_IRQ) {
 100                 pr_debug("resource[1] is not IORESOURCE_IRQ\n");
 101                 return -ENOMEM;
 102         }
 103
 104         hcd = usb_create_hcd(&ohci_au1xxx_hc_driver, &pdev->dev, "au1xxx");
 105         if (!hcd)
 106                 return -ENOMEM;
 107
 108         hcd->rsrc_start = pdev->resource[0].start;
 109         hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1;
 110
 111         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 112                 pr_debug("request_mem_region failed\n");
 113                 ret = -EBUSY;
 114                 goto err1;
 115         }
 116
 117         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 118         if (!hcd->regs) {
 119                 pr_debug("ioremap failed\n");
 120                 ret = -ENOMEM;
 121                 goto err2;
 122         }
 123
 124         unit = (hcd->rsrc_start == AU1300_USB_OHCI1_PHYS_ADDR) ?
 125                         ALCHEMY_USB_OHCI1 : ALCHEMY_USB_OHCI0;
 126         if (alchemy_usb_control(unit, 1)) {
 127                 printk(KERN_INFO "%s: controller init failed!\n", pdev->name);
 128                 ret = -ENODEV;
 129                 goto err3;
 130         }
 131
 132         ohci_hcd_init(hcd_to_ohci(hcd));
 133
 134         ret = usb_add_hcd(hcd, pdev->resource[1].start,
 135                           IRQF_SHARED);
 136         if (ret == 0) {
 137                 platform_set_drvdata(pdev, hcd);
 138                 return ret;
 139         }
 140
 141         alchemy_usb_control(unit, 0);
 142 err3:
 143         iounmap(hcd->regs);
 144 err2:
 145         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 146 err1:
 147         usb_put_hcd(hcd);
 148         return ret;
 149 }
 150
 151 static int ohci_hcd_au1xxx_drv_remove(struct platform_device *pdev)
 152 {
 153         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 154         int unit;
 155
 156         unit = (hcd->rsrc_start == AU1300_USB_OHCI1_PHYS_ADDR) ?
 157                         ALCHEMY_USB_OHCI1 : ALCHEMY_USB_OHCI0;
 158         usb_remove_hcd(hcd);
 159         alchemy_usb_control(unit, 0);
 160         iounmap(hcd->regs);
 161         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 162         usb_put_hcd(hcd);
 163         platform_set_drvdata(pdev, NULL);
 164
 165         return 0;
 166 }
 167
 168 #ifdef CONFIG_PM
 169 static int ohci_hcd_au1xxx_drv_suspend(struct device *dev)
 170 {
 171         struct usb_hcd *hcd = dev_get_drvdata(dev);
 172         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 173         unsigned long flags;
 174         int rc;
 175
 176         rc = 0;
 177
 178         /* Root hub was already suspended. Disable irq emission and
 179          * mark HW unaccessible, bail out if RH has been resumed. Use
 180          * the spinlock to properly synchronize with possible pending
 181          * RH suspend or resume activity.
 182          */
 183         spin_lock_irqsave(&ohci->lock, flags);
 184         if (ohci->rh_state != OHCI_RH_SUSPENDED) {
 185                 rc = -EINVAL;
 186                 goto bail;
 187         }
 188         ohci_writel(ohci, OHCI_INTR_MIE, &ohci->regs->intrdisable);
 189         (void)ohci_readl(ohci, &ohci->regs->intrdisable);
 190
 191         clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
 192
 193         alchemy_usb_control(ALCHEMY_USB_OHCI0, 0);
 194 bail:
 195         spin_unlock_irqrestore(&ohci->lock, flags);
 196
 197         return rc;
 198 }
 199
 200 static int ohci_hcd_au1xxx_drv_resume(struct device *dev)
 201 {
 202         struct usb_hcd *hcd = dev_get_drvdata(dev);
 203
 204         alchemy_usb_control(ALCHEMY_USB_OHCI0, 1);
 205
 206         set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
 207         ohci_finish_controller_resume(hcd);
 208
 209         return 0;
 210 }
 211
 212 static const struct dev_pm_ops au1xxx_ohci_pmops = {
 213         .suspend        = ohci_hcd_au1xxx_drv_suspend,
 214         .resume         = ohci_hcd_au1xxx_drv_resume,
 215 };
 216
 217 #define AU1XXX_OHCI_PMOPS &au1xxx_ohci_pmops
 218
 219 #else
 220 #define AU1XXX_OHCI_PMOPS NULL
 221 #endif
 222
 223 static struct platform_driver ohci_hcd_au1xxx_driver = {
 224         .probe          = ohci_hcd_au1xxx_drv_probe,
 225         .remove         = ohci_hcd_au1xxx_drv_remove,
 226         .shutdown       = usb_hcd_platform_shutdown,
 227         .driver         = {
 228                 .name   = "au1xxx-ohci",
 229                 .owner  = THIS_MODULE,
 230                 .pm     = AU1XXX_OHCI_PMOPS,
 231         },
 232 };
 233
 234 MODULE_ALIAS("platform:au1xxx-ohci");