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_platform.h>
  18
  19 #include <asm/prom.h>
  20
  21
  22 static int
  23 ohci_ppc_of_start(struct usb_hcd *hcd)
  24 {
  25         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
  26         int             ret;
  27
  28         if ((ret = ohci_init(ohci)) < 0)
  29                 return ret;
  30
  31         if ((ret = ohci_run(ohci)) < 0) {
  32                 dev_err(hcd->self.controller, "can't start %s\n",
  33                         hcd->self.bus_name);
  34                 ohci_stop(hcd);
  35                 return ret;
  36         }
  37
  38         return 0;
  39 }
  40
  41 static const struct hc_driver ohci_ppc_of_hc_driver = {
  42         .description =          hcd_name,
  43         .product_desc =         "OF OHCI",
  44         .hcd_priv_size =        sizeof(struct ohci_hcd),
  45
  46         /*
  47          * generic hardware linkage
  48          */
  49         .irq =                  ohci_irq,
  50         .flags =                HCD_USB11 | HCD_MEMORY,
  51
  52         /*
  53          * basic lifecycle operations
  54          */
  55         .start =                ohci_ppc_of_start,
  56         .stop =                 ohci_stop,
  57         .shutdown =             ohci_shutdown,
  58
  59         /*
  60          * managing i/o requests and associated device resources
  61          */
  62         .urb_enqueue =          ohci_urb_enqueue,
  63         .urb_dequeue =          ohci_urb_dequeue,
  64         .endpoint_disable =     ohci_endpoint_disable,
  65
  66         /*
  67          * scheduling support
  68          */
  69         .get_frame_number =     ohci_get_frame,
  70
  71         /*
  72          * root hub support
  73          */
  74         .hub_status_data =      ohci_hub_status_data,
  75         .hub_control =          ohci_hub_control,
  76 #ifdef  CONFIG_PM
  77         .bus_suspend =          ohci_bus_suspend,
  78         .bus_resume =           ohci_bus_resume,
  79 #endif
  80         .start_port_reset =     ohci_start_port_reset,
  81 };
  82
  83
  84 static int ohci_hcd_ppc_of_probe(struct platform_device *op)
  85 {
  86         struct device_node *dn = op->dev.of_node;
  87         struct usb_hcd *hcd;
  88         struct ohci_hcd *ohci;
  89         struct resource res;
  90         int irq;
  91
  92         int rv;
  93         int is_bigendian;
  94         struct device_node *np;
  95
  96         if (usb_disabled())
  97                 return -ENODEV;
  98
  99         is_bigendian =
 100                 of_device_is_compatible(dn, "ohci-bigendian") ||
 101                 of_device_is_compatible(dn, "ohci-be");
 102
 103         dev_dbg(&op->dev, "initializing PPC-OF USB Controller\n");
 104
 105         rv = of_address_to_resource(dn, 0, &res);
 106         if (rv)
 107                 return rv;
 108
 109         hcd = usb_create_hcd(&ohci_ppc_of_hc_driver, &op->dev, "PPC-OF USB");
 110         if (!hcd)
 111                 return -ENOMEM;
 112
 113         hcd->rsrc_start = res.start;
 114         hcd->rsrc_len = resource_size(&res);
 115
 116         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 117                 printk(KERN_ERR "%s: request_mem_region failed\n", __FILE__);
 118                 rv = -EBUSY;
 119                 goto err_rmr;
 120         }
 121
 122         irq = irq_of_parse_and_map(dn, 0);
 123         if (irq == NO_IRQ) {
 124                 printk(KERN_ERR "%s: irq_of_parse_and_map failed\n", __FILE__);
 125                 rv = -EBUSY;
 126                 goto err_irq;
 127         }
 128
 129         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 130         if (!hcd->regs) {
 131                 printk(KERN_ERR "%s: ioremap failed\n", __FILE__);
 132                 rv = -ENOMEM;
 133                 goto err_ioremap;
 134         }
 135
 136         ohci = hcd_to_ohci(hcd);
 137         if (is_bigendian) {
 138                 ohci->flags |= OHCI_QUIRK_BE_MMIO | OHCI_QUIRK_BE_DESC;
 139                 if (of_device_is_compatible(dn, "fsl,mpc5200-ohci"))
 140                         ohci->flags |= OHCI_QUIRK_FRAME_NO;
 141                 if (of_device_is_compatible(dn, "mpc5200-ohci"))
 142                         ohci->flags |= OHCI_QUIRK_FRAME_NO;
 143         }
 144
 145         ohci_hcd_init(ohci);
 146
 147         rv = usb_add_hcd(hcd, irq, 0);
 148         if (rv == 0)
 149                 return 0;
 150
 151         /* by now, 440epx is known to show usb_23 erratum */
 152         np = of_find_compatible_node(NULL, NULL, "ibm,usb-ehci-440epx");
 153
 154         /* Work around - At this point ohci_run has executed, the
 155         * controller is running, everything, the root ports, etc., is
 156         * set up.  If the ehci driver is loaded, put the ohci core in
 157         * the suspended state.  The ehci driver will bring it out of
 158         * suspended state when / if a non-high speed USB device is
 159         * attached to the USB Host port.  If the ehci driver is not
 160         * loaded, do nothing. request_mem_region is used to test if
 161         * the ehci driver is loaded.
 162         */
 163         if (np !=  NULL) {
 164                 if (!of_address_to_resource(np, 0, &res)) {
 165                         if (!request_mem_region(res.start, 0x4, hcd_name)) {
 166                                 writel_be((readl_be(&ohci->regs->control) |
 167                                         OHCI_USB_SUSPEND), &ohci->regs->control);
 168                                         (void) readl_be(&ohci->regs->control);
 169                         } else
 170                                 release_mem_region(res.start, 0x4);
 171                 } else
 172                         pr_debug("%s: cannot get ehci offset from fdt\n", __FILE__);
 173         }
 174
 175         iounmap(hcd->regs);
 176 err_ioremap:
 177         irq_dispose_mapping(irq);
 178 err_irq:
 179         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 180 err_rmr:
 181         usb_put_hcd(hcd);
 182
 183         return rv;
 184 }
 185
 186 static int ohci_hcd_ppc_of_remove(struct platform_device *op)
 187 {
 188         struct usb_hcd *hcd = platform_get_drvdata(op);
 189
 190         dev_dbg(&op->dev, "stopping PPC-OF USB Controller\n");
 191
 192         usb_remove_hcd(hcd);
 193
 194         iounmap(hcd->regs);
 195         irq_dispose_mapping(hcd->irq);
 196         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 197
 198         usb_put_hcd(hcd);
 199
 200         return 0;
 201 }
 202
 203 static const struct of_device_id ohci_hcd_ppc_of_match[] = {
 204 #ifdef CONFIG_USB_OHCI_HCD_PPC_OF_BE
 205         {
 206                 .name = "usb",
 207                 .compatible = "ohci-bigendian",
 208         },
 209         {
 210                 .name = "usb",
 211                 .compatible = "ohci-be",
 212         },
 213 #endif
 214 #ifdef CONFIG_USB_OHCI_HCD_PPC_OF_LE
 215         {
 216                 .name = "usb",
 217                 .compatible = "ohci-littledian",
 218         },
 219         {
 220                 .name = "usb",
 221                 .compatible = "ohci-le",
 222         },
 223 #endif
 224         {},
 225 };
 226 MODULE_DEVICE_TABLE(of, ohci_hcd_ppc_of_match);
 227
 228 #if     !defined(CONFIG_USB_OHCI_HCD_PPC_OF_BE) && \
 229         !defined(CONFIG_USB_OHCI_HCD_PPC_OF_LE)
 230 #error "No endianness selected for ppc-of-ohci"
 231 #endif
 232
 233
 234 static struct platform_driver ohci_hcd_ppc_of_driver = {
 235         .probe          = ohci_hcd_ppc_of_probe,
 236         .remove         = ohci_hcd_ppc_of_remove,
 237         .shutdown       = usb_hcd_platform_shutdown,
 238         .driver = {
 239                 .name = "ppc-of-ohci",
 240                 .owner = THIS_MODULE,
 241                 .of_match_table = ohci_hcd_ppc_of_match,
 242         },
 243 };
 244