drivers/usb/host/ehci-ppc-soc.c

   1 /*
   2  * EHCI HCD (Host Controller Driver) for USB.
   3  *
   4  * (C) Copyright 2006-2007 Stefan Roese <sr@denx.de>, DENX Software Engineering
   5  *
   6  * Bus Glue for PPC On-Chip EHCI driver
   7  * Tested on AMCC 440EPx
   8  *
   9  * Based on "ehci-au12xx.c" by David Brownell <dbrownell@users.sourceforge.net>
  10  *
  11  * This file is licenced under the GPL.
  12  */
  13
  14 #include <linux/platform_device.h>
  15
  16 extern int usb_disabled(void);
  17
  18 /**
  19  * usb_ehci_ppc_soc_probe - initialize PPC-SoC-based HCDs
  20  * Context: !in_interrupt()
  21  *
  22  * Allocates basic resources for this USB host controller, and
  23  * then invokes the start() method for the HCD associated with it
  24  * through the hotplug entry's driver_data.
  25  *
  26  */
  27 int usb_ehci_ppc_soc_probe(const struct hc_driver *driver,
  28                            struct usb_hcd **hcd_out,
  29                            struct platform_device *dev)
  30 {
  31         int retval;
  32         struct usb_hcd *hcd;
  33         struct ehci_hcd *ehci;
  34
  35         if (dev->resource[1].flags != IORESOURCE_IRQ) {
  36                 pr_debug("resource[1] is not IORESOURCE_IRQ");
  37                 retval = -ENOMEM;
  38         }
  39         hcd = usb_create_hcd(driver, &dev->dev, "PPC-SOC EHCI");
  40         if (!hcd)
  41                 return -ENOMEM;
  42         hcd->rsrc_start = dev->resource[0].start;
  43         hcd->rsrc_len = dev->resource[0].end - dev->resource[0].start + 1;
  44
  45         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
  46                 pr_debug("request_mem_region failed");
  47                 retval = -EBUSY;
  48                 goto err1;
  49         }
  50
  51         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
  52         if (!hcd->regs) {
  53                 pr_debug("ioremap failed");
  54                 retval = -ENOMEM;
  55                 goto err2;
  56         }
  57
  58         ehci = hcd_to_ehci(hcd);
  59         ehci->big_endian_mmio = 1;
  60         ehci->big_endian_desc = 1;
  61         ehci->caps = hcd->regs;
  62         ehci->regs = hcd->regs + HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
  63
  64         /* cache this readonly data; minimize chip reads */
  65         ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
  66
  67 #if defined(CONFIG_440EPX)
  68         /*
  69          * 440EPx Errata USBH_3
  70          * Fix: Enable Break Memory Transfer (BMT) in INSNREG3
  71          */
  72         out_be32((void *)((ulong)(&ehci->regs->command) + 0x8c), (1 << 0));
  73         ehci_dbg(ehci, "Break Memory Transfer (BMT) has beed enabled!\n");
  74 #endif
  75
  76         retval = usb_add_hcd(hcd, dev->resource[1].start, IRQF_DISABLED);
  77         if (retval == 0)
  78                 return retval;
  79
  80         iounmap(hcd->regs);
  81 err2:
  82         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
  83 err1:
  84         usb_put_hcd(hcd);
  85         return retval;
  86 }
  87
  88 /* may be called without controller electrically present */
  89 /* may be called with controller, bus, and devices active */
  90
  91 /**
  92  * usb_ehci_hcd_ppc_soc_remove - shutdown processing for PPC-SoC-based HCDs
  93  * @dev: USB Host Controller being removed
  94  * Context: !in_interrupt()
  95  *
  96  * Reverses the effect of usb_ehci_hcd_ppc_soc_probe(), first invoking
  97  * the HCD's stop() method.  It is always called from a thread
  98  * context, normally "rmmod", "apmd", or something similar.
  99  *
 100  */
 101 void usb_ehci_ppc_soc_remove(struct usb_hcd *hcd, struct platform_device *dev)
 102 {
 103         usb_remove_hcd(hcd);
 104         iounmap(hcd->regs);
 105         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 106         usb_put_hcd(hcd);
 107 }
 108
 109 static const struct hc_driver ehci_ppc_soc_hc_driver = {
 110         .description = hcd_name,
 111         .product_desc = "PPC-SOC EHCI",
 112         .hcd_priv_size = sizeof(struct ehci_hcd),
 113
 114         /*
 115          * generic hardware linkage
 116          */
 117         .irq = ehci_irq,
 118         .flags = HCD_MEMORY | HCD_USB2,
 119
 120         /*
 121          * basic lifecycle operations
 122          */
 123         .reset = ehci_init,
 124         .start = ehci_run,
 125         .stop = ehci_stop,
 126         .shutdown = ehci_shutdown,
 127
 128         /*
 129          * managing i/o requests and associated device resources
 130          */
 131         .urb_enqueue = ehci_urb_enqueue,
 132         .urb_dequeue = ehci_urb_dequeue,
 133         .endpoint_disable = ehci_endpoint_disable,
 134
 135         /*
 136          * scheduling support
 137          */
 138         .get_frame_number = ehci_get_frame,
 139
 140         /*
 141          * root hub support
 142          */
 143         .hub_status_data = ehci_hub_status_data,
 144         .hub_control = ehci_hub_control,
 145 #ifdef  CONFIG_PM
 146         .hub_suspend = ehci_hub_suspend,
 147         .hub_resume = ehci_hub_resume,
 148 #endif
 149 };
 150
 151 static int ehci_hcd_ppc_soc_drv_probe(struct platform_device *pdev)
 152 {
 153         struct usb_hcd *hcd = NULL;
 154         int ret;
 155
 156         pr_debug("In ehci_hcd_ppc_soc_drv_probe\n");
 157
 158         if (usb_disabled())
 159                 return -ENODEV;
 160
 161         ret = usb_ehci_ppc_soc_probe(&ehci_ppc_soc_hc_driver, &hcd, pdev);
 162         return ret;
 163 }
 164
 165 static int ehci_hcd_ppc_soc_drv_remove(struct platform_device *pdev)
 166 {
 167         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 168
 169         usb_ehci_ppc_soc_remove(hcd, pdev);
 170         return 0;
 171 }
 172
 173 MODULE_ALIAS("ppc-soc-ehci");
 174 static struct platform_driver ehci_ppc_soc_driver = {
 175         .probe = ehci_hcd_ppc_soc_drv_probe,
 176         .remove = ehci_hcd_ppc_soc_drv_remove,
 177         .shutdown = usb_hcd_platform_shutdown,
 178         .driver = {
 179                 .name = "ppc-soc-ehci",
 180                 .bus = &platform_bus_type
 181         }
 182 };