linux/drivers/usb/host/ohci-ppc-of.c
<<
>>
Prefs
   1// SPDX-License-Identifier: GPL-1.0+
   2/*
   3 * OHCI HCD (Host Controller Driver) for USB.
   4 *
   5 * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
   6 * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
   7 * (C) Copyright 2002 Hewlett-Packard Company
   8 * (C) Copyright 2006 Sylvain Munaut <tnt@246tNt.com>
   9 *
  10 * Bus glue for OHCI HC on the of_platform bus
  11 *
  12 * Modified for of_platform bus from ohci-sa1111.c
  13 *
  14 * This file is licenced under the GPL.
  15 */
  16
  17#include <linux/signal.h>
  18#include <linux/of_address.h>
  19#include <linux/of_irq.h>
  20#include <linux/of_platform.h>
  21
  22#include <asm/prom.h>
  23
  24
  25static int
  26ohci_ppc_of_start(struct usb_hcd *hcd)
  27{
  28        struct ohci_hcd *ohci = hcd_to_ohci(hcd);
  29        int             ret;
  30
  31        if ((ret = ohci_init(ohci)) < 0)
  32                return ret;
  33
  34        if ((ret = ohci_run(ohci)) < 0) {
  35                dev_err(hcd->self.controller, "can't start %s\n",
  36                        hcd->self.bus_name);
  37                ohci_stop(hcd);
  38                return ret;
  39        }
  40
  41        return 0;
  42}
  43
  44static const struct hc_driver ohci_ppc_of_hc_driver = {
  45        .description =          hcd_name,
  46        .product_desc =         "OF OHCI",
  47        .hcd_priv_size =        sizeof(struct ohci_hcd),
  48
  49        /*
  50         * generic hardware linkage
  51         */
  52        .irq =                  ohci_irq,
  53        .flags =                HCD_USB11 | HCD_MEMORY,
  54
  55        /*
  56         * basic lifecycle operations
  57         */
  58        .start =                ohci_ppc_of_start,
  59        .stop =                 ohci_stop,
  60        .shutdown =             ohci_shutdown,
  61
  62        /*
  63         * managing i/o requests and associated device resources
  64         */
  65        .urb_enqueue =          ohci_urb_enqueue,
  66        .urb_dequeue =          ohci_urb_dequeue,
  67        .endpoint_disable =     ohci_endpoint_disable,
  68
  69        /*
  70         * scheduling support
  71         */
  72        .get_frame_number =     ohci_get_frame,
  73
  74        /*
  75         * root hub support
  76         */
  77        .hub_status_data =      ohci_hub_status_data,
  78        .hub_control =          ohci_hub_control,
  79#ifdef  CONFIG_PM
  80        .bus_suspend =          ohci_bus_suspend,
  81        .bus_resume =           ohci_bus_resume,
  82#endif
  83        .start_port_reset =     ohci_start_port_reset,
  84};
  85
  86
  87static int ohci_hcd_ppc_of_probe(struct platform_device *op)
  88{
  89        struct device_node *dn = op->dev.of_node;
  90        struct usb_hcd *hcd;
  91        struct ohci_hcd *ohci;
  92        struct resource res;
  93        int irq;
  94
  95        int rv;
  96        int is_bigendian;
  97        struct device_node *np;
  98
  99        if (usb_disabled())
 100                return -ENODEV;
 101
 102        is_bigendian =
 103                of_device_is_compatible(dn, "ohci-bigendian") ||
 104                of_device_is_compatible(dn, "ohci-be");
 105
 106        dev_dbg(&op->dev, "initializing PPC-OF USB Controller\n");
 107
 108        rv = of_address_to_resource(dn, 0, &res);
 109        if (rv)
 110                return rv;
 111
 112        hcd = usb_create_hcd(&ohci_ppc_of_hc_driver, &op->dev, "PPC-OF USB");
 113        if (!hcd)
 114                return -ENOMEM;
 115
 116        hcd->rsrc_start = res.start;
 117        hcd->rsrc_len = resource_size(&res);
 118
 119        hcd->regs = devm_ioremap_resource(&op->dev, &res);
 120        if (IS_ERR(hcd->regs)) {
 121                rv = PTR_ERR(hcd->regs);
 122                goto err_rmr;
 123        }
 124
 125        irq = irq_of_parse_and_map(dn, 0);
 126        if (irq == NO_IRQ) {
 127                dev_err(&op->dev, "%s: irq_of_parse_and_map failed\n",
 128                        __FILE__);
 129                rv = -EBUSY;
 130                goto err_rmr;
 131        }
 132
 133        ohci = hcd_to_ohci(hcd);
 134        if (is_bigendian) {
 135                ohci->flags |= OHCI_QUIRK_BE_MMIO | OHCI_QUIRK_BE_DESC;
 136                if (of_device_is_compatible(dn, "fsl,mpc5200-ohci"))
 137                        ohci->flags |= OHCI_QUIRK_FRAME_NO;
 138                if (of_device_is_compatible(dn, "mpc5200-ohci"))
 139                        ohci->flags |= OHCI_QUIRK_FRAME_NO;
 140        }
 141
 142        ohci_hcd_init(ohci);
 143
 144        rv = usb_add_hcd(hcd, irq, 0);
 145        if (rv == 0) {
 146                device_wakeup_enable(hcd->self.controller);
 147                return 0;
 148        }
 149
 150        /* by now, 440epx is known to show usb_23 erratum */
 151        np = of_find_compatible_node(NULL, NULL, "ibm,usb-ehci-440epx");
 152
 153        /* Work around - At this point ohci_run has executed, the
 154        * controller is running, everything, the root ports, etc., is
 155        * set up.  If the ehci driver is loaded, put the ohci core in
 156        * the suspended state.  The ehci driver will bring it out of
 157        * suspended state when / if a non-high speed USB device is
 158        * attached to the USB Host port.  If the ehci driver is not
 159        * loaded, do nothing. request_mem_region is used to test if
 160        * the ehci driver is loaded.
 161        */
 162        if (np !=  NULL) {
 163                if (!of_address_to_resource(np, 0, &res)) {
 164                        if (!request_mem_region(res.start, 0x4, hcd_name)) {
 165                                writel_be((readl_be(&ohci->regs->control) |
 166                                        OHCI_USB_SUSPEND), &ohci->regs->control);
 167                                        (void) readl_be(&ohci->regs->control);
 168                        } else
 169                                release_mem_region(res.start, 0x4);
 170                } else
 171                        pr_debug("%s: cannot get ehci offset from fdt\n", __FILE__);
 172        }
 173
 174        irq_dispose_mapping(irq);
 175err_rmr:
 176        usb_put_hcd(hcd);
 177
 178        return rv;
 179}
 180
 181static int ohci_hcd_ppc_of_remove(struct platform_device *op)
 182{
 183        struct usb_hcd *hcd = platform_get_drvdata(op);
 184
 185        dev_dbg(&op->dev, "stopping PPC-OF USB Controller\n");
 186
 187        usb_remove_hcd(hcd);
 188
 189        irq_dispose_mapping(hcd->irq);
 190
 191        usb_put_hcd(hcd);
 192
 193        return 0;
 194}
 195
 196static const struct of_device_id ohci_hcd_ppc_of_match[] = {
 197#ifdef CONFIG_USB_OHCI_HCD_PPC_OF_BE
 198        {
 199                .name = "usb",
 200                .compatible = "ohci-bigendian",
 201        },
 202        {
 203                .name = "usb",
 204                .compatible = "ohci-be",
 205        },
 206#endif
 207#ifdef CONFIG_USB_OHCI_HCD_PPC_OF_LE
 208        {
 209                .name = "usb",
 210                .compatible = "ohci-littledian",
 211        },
 212        {
 213                .name = "usb",
 214                .compatible = "ohci-le",
 215        },
 216#endif
 217        {},
 218};
 219MODULE_DEVICE_TABLE(of, ohci_hcd_ppc_of_match);
 220
 221#if     !defined(CONFIG_USB_OHCI_HCD_PPC_OF_BE) && \
 222        !defined(CONFIG_USB_OHCI_HCD_PPC_OF_LE)
 223#error "No endianness selected for ppc-of-ohci"
 224#endif
 225
 226
 227static struct platform_driver ohci_hcd_ppc_of_driver = {
 228        .probe          = ohci_hcd_ppc_of_probe,
 229        .remove         = ohci_hcd_ppc_of_remove,
 230        .shutdown       = usb_hcd_platform_shutdown,
 231        .driver = {
 232                .name = "ppc-of-ohci",
 233                .of_match_table = ohci_hcd_ppc_of_match,
 234        },
 235};
 236
 237