kernel/drivers/usb/host/ohci-ppc-of.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 2006 Sylvain Munaut <tnt@246tNt.com>
   8  *
   9  * Bus glue for OHCI HC on the of_platform bus
  10  *
  11  * Modified for of_platform bus from ohci-sa1111.c
  12  *
  13  * This file is licenced under the GPL.
  14  */
  15
  16 #include <linux/signal.h>
  17 #include <linux/of_address.h>
  18 #include <linux/of_irq.h>
  19 #include <linux/of_platform.h>
  20
  21 #include <asm/prom.h>
  22
  23
  24 static int
  25 ohci_ppc_of_start(struct usb_hcd *hcd)
  26 {
  27         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
  28         int             ret;
  29
  30         if ((ret = ohci_init(ohci)) < 0)
  31                 return ret;
  32
  33         if ((ret = ohci_run(ohci)) < 0) {
  34                 dev_err(hcd->self.controller, "can't start %s\n",
  35                         hcd->self.bus_name);
  36                 ohci_stop(hcd);
  37                 return ret;
  38         }
  39
  40         return 0;
  41 }
  42
  43 static const struct hc_driver ohci_ppc_of_hc_driver = {
  44         .description =          hcd_name,
  45         .product_desc =         "OF OHCI",
  46         .hcd_priv_size =        sizeof(struct ohci_hcd),
  47
  48         /*
  49          * generic hardware linkage
  50          */
  51         .irq =                  ohci_irq,
  52         .flags =                HCD_USB11 | HCD_MEMORY,
  53
  54         /*
  55          * basic lifecycle operations
  56          */
  57         .start =                ohci_ppc_of_start,
  58         .stop =                 ohci_stop,
  59         .shutdown =             ohci_shutdown,
  60
  61         /*
  62          * managing i/o requests and associated device resources
  63          */
  64         .urb_enqueue =          ohci_urb_enqueue,
  65         .urb_dequeue =          ohci_urb_dequeue,
  66         .endpoint_disable =     ohci_endpoint_disable,
  67
  68         /*
  69          * scheduling support
  70          */
  71         .get_frame_number =     ohci_get_frame,
  72
  73         /*
  74          * root hub support
  75          */
  76         .hub_status_data =      ohci_hub_status_data,
  77         .hub_control =          ohci_hub_control,
  78 #ifdef  CONFIG_PM
  79         .bus_suspend =          ohci_bus_suspend,
  80         .bus_resume =           ohci_bus_resume,
  81 #endif
  82         .start_port_reset =     ohci_start_port_reset,
  83 };
  84
  85
  86 static int ohci_hcd_ppc_of_probe(struct platform_device *op)
  87 {
  88         struct device_node *dn = op->dev.of_node;
  89         struct usb_hcd *hcd;
  90         struct ohci_hcd *ohci;
  91         struct resource res;
  92         int irq;
  93
  94         int rv;
  95         int is_bigendian;
  96         struct device_node *np;
  97
  98         if (usb_disabled())
  99                 return -ENODEV;
 100
 101         is_bigendian =
 102                 of_device_is_compatible(dn, "ohci-bigendian") ||
 103                 of_device_is_compatible(dn, "ohci-be");
 104
 105         dev_dbg(&op->dev, "initializing PPC-OF USB Controller\n");
 106
 107         rv = of_address_to_resource(dn, 0, &res);
 108         if (rv)
 109                 return rv;
 110
 111         hcd = usb_create_hcd(&ohci_ppc_of_hc_driver, &op->dev, "PPC-OF USB");
 112         if (!hcd)
 113                 return -ENOMEM;
 114
 115         hcd->rsrc_start = res.start;
 116         hcd->rsrc_len = resource_size(&res);
 117
 118         hcd->regs = devm_ioremap_resource(&op->dev, &res);
 119         if (IS_ERR(hcd->regs)) {
 120                 rv = PTR_ERR(hcd->regs);
 121                 goto err_rmr;
 122         }
 123
 124         irq = irq_of_parse_and_map(dn, 0);
 125         if (irq == NO_IRQ) {
 126                 dev_err(&op->dev, "%s: irq_of_parse_and_map failed\n",
 127                         __FILE__);
 128                 rv = -EBUSY;
 129                 goto err_rmr;
 130         }
 131
 132         ohci = hcd_to_ohci(hcd);
 133         if (is_bigendian) {
 134                 ohci->flags |= OHCI_QUIRK_BE_MMIO | OHCI_QUIRK_BE_DESC;
 135                 if (of_device_is_compatible(dn, "fsl,mpc5200-ohci"))
 136                         ohci->flags |= OHCI_QUIRK_FRAME_NO;
 137                 if (of_device_is_compatible(dn, "mpc5200-ohci"))
 138                         ohci->flags |= OHCI_QUIRK_FRAME_NO;
 139         }
 140
 141         ohci_hcd_init(ohci);
 142
 143         rv = usb_add_hcd(hcd, irq, 0);
 144         if (rv == 0) {
 145                 device_wakeup_enable(hcd->self.controller);
 146                 return 0;
 147         }
 148
 149         /* by now, 440epx is known to show usb_23 erratum */
 150         np = of_find_compatible_node(NULL, NULL, "ibm,usb-ehci-440epx");
 151
 152         /* Work around - At this point ohci_run has executed, the
 153         * controller is running, everything, the root ports, etc., is
 154         * set up.  If the ehci driver is loaded, put the ohci core in
 155         * the suspended state.  The ehci driver will bring it out of
 156         * suspended state when / if a non-high speed USB device is
 157         * attached to the USB Host port.  If the ehci driver is not
 158         * loaded, do nothing. request_mem_region is used to test if
 159         * the ehci driver is loaded.
 160         */
 161         if (np !=  NULL) {
 162                 if (!of_address_to_resource(np, 0, &res)) {
 163                         if (!request_mem_region(res.start, 0x4, hcd_name)) {
 164                                 writel_be((readl_be(&ohci->regs->control) |
 165                                         OHCI_USB_SUSPEND), &ohci->regs->control);
 166                                         (void) readl_be(&ohci->regs->control);
 167                         } else
 168                                 release_mem_region(res.start, 0x4);
 169                 } else
 170                         pr_debug("%s: cannot get ehci offset from fdt\n", __FILE__);
 171         }
 172
 173         irq_dispose_mapping(irq);
 174 err_rmr:
 175         usb_put_hcd(hcd);
 176
 177         return rv;
 178 }
 179
 180 static int ohci_hcd_ppc_of_remove(struct platform_device *op)
 181 {
 182         struct usb_hcd *hcd = platform_get_drvdata(op);
 183
 184         dev_dbg(&op->dev, "stopping PPC-OF USB Controller\n");
 185
 186         usb_remove_hcd(hcd);
 187
 188         irq_dispose_mapping(hcd->irq);
 189
 190         usb_put_hcd(hcd);
 191
 192         return 0;
 193 }
 194
 195 static const struct of_device_id ohci_hcd_ppc_of_match[] = {
 196 #ifdef CONFIG_USB_OHCI_HCD_PPC_OF_BE
 197         {
 198                 .name = "usb",
 199                 .compatible = "ohci-bigendian",
 200         },
 201         {
 202                 .name = "usb",
 203                 .compatible = "ohci-be",
 204         },
 205 #endif
 206 #ifdef CONFIG_USB_OHCI_HCD_PPC_OF_LE
 207         {
 208                 .name = "usb",
 209                 .compatible = "ohci-littledian",
 210         },
 211         {
 212                 .name = "usb",
 213                 .compatible = "ohci-le",
 214         },
 215 #endif
 216         {},
 217 };
 218 MODULE_DEVICE_TABLE(of, ohci_hcd_ppc_of_match);
 219
 220 #if     !defined(CONFIG_USB_OHCI_HCD_PPC_OF_BE) && \
 221         !defined(CONFIG_USB_OHCI_HCD_PPC_OF_LE)
 222 #error "No endianness selected for ppc-of-ohci"
 223 #endif
 224
 225
 226 static struct platform_driver ohci_hcd_ppc_of_driver = {
 227         .probe          = ohci_hcd_ppc_of_probe,
 228         .remove         = ohci_hcd_ppc_of_remove,
 229         .shutdown       = usb_hcd_platform_shutdown,
 230         .driver = {
 231                 .name = "ppc-of-ohci",
 232                 .of_match_table = ohci_hcd_ppc_of_match,
 233         },
 234 };
 235