drivers/usb/host/ohci-pnx8550.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  * (C) Copyright 2005 Embedded Alley Solutions, Inc.
   8  *
   9  * Bus Glue for PNX8550
  10  *
  11  * Written by Christopher Hoover <ch@hpl.hp.com>
  12  * Based on fragments of previous driver by Russell King et al.
  13  *
  14  * Modified for LH7A404 from ohci-sa1111.c
  15  *  by Durgesh Pattamatta <pattamattad@sharpsec.com>
  16  *
  17  * Modified for PNX8550 from ohci-sa1111.c and sa-omap.c
  18  *  by Vitaly Wool <vitalywool@gmail.com>
  19  *
  20  * This file is licenced under the GPL.
  21  */
  22
  23 #include <linux/device.h>
  24 #include <linux/platform_device.h>
  25 #include <asm/mach-pnx8550/usb.h>
  26 #include <asm/mach-pnx8550/int.h>
  27 #include <asm/mach-pnx8550/pci.h>
  28
  29 #ifndef CONFIG_PNX8550
  30 #error "This file is PNX8550 bus glue.  CONFIG_PNX8550 must be defined."
  31 #endif
  32
  33 extern int usb_disabled(void);
  34
  35 /*-------------------------------------------------------------------------*/
  36
  37 static void pnx8550_start_hc(struct platform_device *dev)
  38 {
  39         /*
  40          * Set register CLK48CTL to enable and 48MHz
  41          */
  42         outl(0x00000003, PCI_BASE | 0x0004770c);
  43
  44         /*
  45          * Set register CLK12CTL to enable and 48MHz
  46          */
  47         outl(0x00000003, PCI_BASE | 0x00047710);
  48
  49         udelay(100);
  50 }
  51
  52 static void pnx8550_stop_hc(struct platform_device *dev)
  53 {
  54         udelay(10);
  55 }
  56
  57
  58 /*-------------------------------------------------------------------------*/
  59
  60 /* configure so an HC device and id are always provided */
  61 /* always called with process context; sleeping is OK */
  62
  63
  64 /**
  65  * usb_hcd_pnx8550_probe - initialize pnx8550-based HCDs
  66  * Context: !in_interrupt()
  67  *
  68  * Allocates basic resources for this USB host controller, and
  69  * then invokes the start() method for the HCD associated with it
  70  * through the hotplug entry's driver_data.
  71  *
  72  */
  73 int usb_hcd_pnx8550_probe (const struct hc_driver *driver,
  74                           struct platform_device *dev)
  75 {
  76         int retval;
  77         struct usb_hcd *hcd;
  78
  79         if (dev->resource[0].flags != IORESOURCE_MEM ||
  80                         dev->resource[1].flags != IORESOURCE_IRQ) {
  81                 dev_err (&dev->dev,"invalid resource type\n");
  82                 return -ENOMEM;
  83         }
  84
  85         hcd = usb_create_hcd (driver, &dev->dev, "pnx8550");
  86         if (!hcd)
  87                 return -ENOMEM;
  88         hcd->rsrc_start = dev->resource[0].start;
  89         hcd->rsrc_len = dev->resource[0].end - dev->resource[0].start + 1;
  90
  91         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
  92                 dev_err(&dev->dev, "request_mem_region [0x%08llx, 0x%08llx] "
  93                                 "failed\n", hcd->rsrc_start, hcd->rsrc_len);
  94                 retval = -EBUSY;
  95                 goto err1;
  96         }
  97
  98         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
  99         if (!hcd->regs) {
 100                 dev_err(&dev->dev, "ioremap [[0x%08llx, 0x%08llx] failed\n",
 101                                 hcd->rsrc_start, hcd->rsrc_len);
 102                 retval = -ENOMEM;
 103                 goto err2;
 104         }
 105
 106         pnx8550_start_hc(dev);
 107
 108         ohci_hcd_init(hcd_to_ohci(hcd));
 109
 110         retval = usb_add_hcd(hcd, dev->resource[1].start, IRQF_DISABLED);
 111         if (retval == 0)
 112                 return retval;
 113
 114         pnx8550_stop_hc(dev);
 115         iounmap(hcd->regs);
 116  err2:
 117         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 118  err1:
 119         usb_put_hcd(hcd);
 120         return retval;
 121 }
 122
 123
 124 /* may be called without controller electrically present */
 125 /* may be called with controller, bus, and devices active */
 126
 127 /**
 128  * usb_hcd_pnx8550_remove - shutdown processing for pnx8550-based HCDs
 129  * @dev: USB Host Controller being removed
 130  * Context: !in_interrupt()
 131  *
 132  * Reverses the effect of usb_hcd_pnx8550_probe(), first invoking
 133  * the HCD's stop() method.  It is always called from a thread
 134  * context, normally "rmmod", "apmd", or something similar.
 135  *
 136  */
 137 void usb_hcd_pnx8550_remove (struct usb_hcd *hcd, struct platform_device *dev)
 138 {
 139         usb_remove_hcd(hcd);
 140         pnx8550_stop_hc(dev);
 141         iounmap(hcd->regs);
 142         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 143         usb_put_hcd(hcd);
 144 }
 145
 146 /*-------------------------------------------------------------------------*/
 147
 148 static int __devinit
 149 ohci_pnx8550_start (struct usb_hcd *hcd)
 150 {
 151         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 152         int             ret;
 153
 154         ohci_dbg (ohci, "ohci_pnx8550_start, ohci:%p", ohci);
 155
 156         if ((ret = ohci_init(ohci)) < 0)
 157                 return ret;
 158
 159         if ((ret = ohci_run (ohci)) < 0) {
 160                 err ("can't start %s", hcd->self.bus_name);
 161                 ohci_stop (hcd);
 162                 return ret;
 163         }
 164
 165         return 0;
 166 }
 167
 168 /*-------------------------------------------------------------------------*/
 169
 170 static const struct hc_driver ohci_pnx8550_hc_driver = {
 171         .description =          hcd_name,
 172         .product_desc =         "PNX8550 OHCI",
 173         .hcd_priv_size =        sizeof(struct ohci_hcd),
 174
 175         /*
 176          * generic hardware linkage
 177          */
 178         .irq =                  ohci_irq,
 179         .flags =                HCD_USB11 | HCD_MEMORY,
 180
 181         /*
 182          * basic lifecycle operations
 183          */
 184         .start =                ohci_pnx8550_start,
 185         .stop =                 ohci_stop,
 186
 187         /*
 188          * managing i/o requests and associated device resources
 189          */
 190         .urb_enqueue =          ohci_urb_enqueue,
 191         .urb_dequeue =          ohci_urb_dequeue,
 192         .endpoint_disable =     ohci_endpoint_disable,
 193
 194         /*
 195          * scheduling support
 196          */
 197         .get_frame_number =     ohci_get_frame,
 198
 199         /*
 200          * root hub support
 201          */
 202         .hub_status_data =      ohci_hub_status_data,
 203         .hub_control =          ohci_hub_control,
 204 #ifdef  CONFIG_PM
 205         .bus_suspend =          ohci_bus_suspend,
 206         .bus_resume =           ohci_bus_resume,
 207 #endif
 208         .start_port_reset =     ohci_start_port_reset,
 209 };
 210
 211 /*-------------------------------------------------------------------------*/
 212
 213 static int ohci_hcd_pnx8550_drv_probe(struct platform_device *pdev)
 214 {
 215         int ret;
 216
 217         if (usb_disabled())
 218                 return -ENODEV;
 219
 220         ret = usb_hcd_pnx8550_probe(&ohci_pnx8550_hc_driver, pdev);
 221         return ret;
 222 }
 223
 224 static int ohci_hcd_pnx8550_drv_remove(struct platform_device *pdev)
 225 {
 226         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 227
 228         usb_hcd_pnx8550_remove(hcd, pdev);
 229         return 0;
 230 }
 231
 232 MODULE_ALIAS("platform:pnx8550-ohci");
 233
 234 static struct platform_driver ohci_hcd_pnx8550_driver = {
 235         .driver = {
 236                 .name   = "pnx8550-ohci",
 237                 .owner  = THIS_MODULE,
 238         },
 239         .probe          = ohci_hcd_pnx8550_drv_probe,
 240         .remove         = ohci_hcd_pnx8550_drv_remove,
 241 };
 242