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-au1xxx.c" by K.Boge <karsten.boge@amd.com>
  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 /* called during probe() after chip reset completes */
  19 static int ehci_ppc_soc_setup(struct usb_hcd *hcd)
  20 {
  21         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  22         int             retval;
  23
  24         retval = ehci_halt(ehci);
  25         if (retval)
  26                 return retval;
  27
  28         retval = ehci_init(hcd);
  29         if (retval)
  30                 return retval;
  31
  32         ehci->sbrn = 0x20;
  33         return ehci_reset(ehci);
  34 }
  35
  36 /**
  37  * usb_ehci_ppc_soc_probe - initialize PPC-SoC-based HCDs
  38  * Context: !in_interrupt()
  39  *
  40  * Allocates basic resources for this USB host controller, and
  41  * then invokes the start() method for the HCD associated with it
  42  * through the hotplug entry's driver_data.
  43  *
  44  */
  45 int usb_ehci_ppc_soc_probe(const struct hc_driver *driver,
  46                            struct usb_hcd **hcd_out,
  47                            struct platform_device *dev)
  48 {
  49         int retval;
  50         struct usb_hcd *hcd;
  51         struct ehci_hcd *ehci;
  52
  53         if (dev->resource[1].flags != IORESOURCE_IRQ) {
  54                 pr_debug("resource[1] is not IORESOURCE_IRQ");
  55                 retval = -ENOMEM;
  56         }
  57         hcd = usb_create_hcd(driver, &dev->dev, "PPC-SOC EHCI");
  58         if (!hcd)
  59                 return -ENOMEM;
  60         hcd->rsrc_start = dev->resource[0].start;
  61         hcd->rsrc_len = dev->resource[0].end - dev->resource[0].start + 1;
  62
  63         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
  64                 pr_debug("request_mem_region failed");
  65                 retval = -EBUSY;
  66                 goto err1;
  67         }
  68
  69         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
  70         if (!hcd->regs) {
  71                 pr_debug("ioremap failed");
  72                 retval = -ENOMEM;
  73                 goto err2;
  74         }
  75
  76         ehci = hcd_to_ehci(hcd);
  77         ehci->big_endian_mmio = 1;
  78         ehci->big_endian_desc = 1;
  79         ehci->caps = hcd->regs;
  80         ehci->regs = hcd->regs + HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
  81
  82         /* cache this readonly data; minimize chip reads */
  83         ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
  84
  85 #if defined(CONFIG_440EPX)
  86         /*
  87          * 440EPx Errata USBH_3
  88          * Fix: Enable Break Memory Transfer (BMT) in INSNREG3
  89          */
  90         out_be32((void *)((ulong)(&ehci->regs->command) + 0x8c), (1 << 0));
  91         ehci_dbg(ehci, "Break Memory Transfer (BMT) has beed enabled!\n");
  92 #endif
  93
  94         retval = usb_add_hcd(hcd, dev->resource[1].start, IRQF_DISABLED);
  95         if (retval == 0)
  96                 return retval;
  97
  98         iounmap(hcd->regs);
  99 err2:
 100         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 101 err1:
 102         usb_put_hcd(hcd);
 103         return retval;
 104 }
 105
 106 /* may be called without controller electrically present */
 107 /* may be called with controller, bus, and devices active */
 108
 109 /**
 110  * usb_ehci_hcd_ppc_soc_remove - shutdown processing for PPC-SoC-based HCDs
 111  * @dev: USB Host Controller being removed
 112  * Context: !in_interrupt()
 113  *
 114  * Reverses the effect of usb_ehci_hcd_ppc_soc_probe(), first invoking
 115  * the HCD's stop() method.  It is always called from a thread
 116  * context, normally "rmmod", "apmd", or something similar.
 117  *
 118  */
 119 void usb_ehci_ppc_soc_remove(struct usb_hcd *hcd, struct platform_device *dev)
 120 {
 121         usb_remove_hcd(hcd);
 122         iounmap(hcd->regs);
 123         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 124         usb_put_hcd(hcd);
 125 }
 126
 127 static const struct hc_driver ehci_ppc_soc_hc_driver = {
 128         .description = hcd_name,
 129         .product_desc = "PPC-SOC EHCI",
 130         .hcd_priv_size = sizeof(struct ehci_hcd),
 131
 132         /*
 133          * generic hardware linkage
 134          */
 135         .irq = ehci_irq,
 136         .flags = HCD_MEMORY | HCD_USB2,
 137
 138         /*
 139          * basic lifecycle operations
 140          */
 141         .reset = ehci_ppc_soc_setup,
 142         .start = ehci_run,
 143         .stop = ehci_stop,
 144         .shutdown = ehci_shutdown,
 145
 146         /*
 147          * managing i/o requests and associated device resources
 148          */
 149         .urb_enqueue = ehci_urb_enqueue,
 150         .urb_dequeue = ehci_urb_dequeue,
 151         .endpoint_disable = ehci_endpoint_disable,
 152
 153         /*
 154          * scheduling support
 155          */
 156         .get_frame_number = ehci_get_frame,
 157
 158         /*
 159          * root hub support
 160          */
 161         .hub_status_data = ehci_hub_status_data,
 162         .hub_control = ehci_hub_control,
 163         .bus_suspend = ehci_bus_suspend,
 164         .bus_resume = ehci_bus_resume,
 165         .relinquish_port = ehci_relinquish_port,
 166         .port_handed_over = ehci_port_handed_over,
 167 };
 168
 169 static int ehci_hcd_ppc_soc_drv_probe(struct platform_device *pdev)
 170 {
 171         struct usb_hcd *hcd = NULL;
 172         int ret;
 173
 174         pr_debug("In ehci_hcd_ppc_soc_drv_probe\n");
 175
 176         if (usb_disabled())
 177                 return -ENODEV;
 178
 179         /* FIXME we only want one one probe() not two */
 180         ret = usb_ehci_ppc_soc_probe(&ehci_ppc_soc_hc_driver, &hcd, pdev);
 181         return ret;
 182 }
 183
 184 static int ehci_hcd_ppc_soc_drv_remove(struct platform_device *pdev)
 185 {
 186         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 187
 188         /* FIXME we only want one one remove() not two */
 189         usb_ehci_ppc_soc_remove(hcd, pdev);
 190         return 0;
 191 }
 192
 193 MODULE_ALIAS("platform:ppc-soc-ehci");
 194 static struct platform_driver ehci_ppc_soc_driver = {
 195         .probe = ehci_hcd_ppc_soc_drv_probe,
 196         .remove = ehci_hcd_ppc_soc_drv_remove,
 197         .shutdown = usb_hcd_platform_shutdown,
 198         .driver = {
 199                 .name = "ppc-soc-ehci",
 200         }
 201 };