usb_host.c

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/*
 * Copyright 2012 Tilera Corporation. All Rights Reserved.
 *
 *   This program is free software; you can redistribute it and/or
 *   modify it under the terms of the GNU General Public License
 *   as published by the Free Software Foundation, version 2.
 *
 *   This program is distributed in the hope that it will be useful, but
 *   WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 *   NON INFRINGEMENT.  See the GNU General Public License for
 *   more details.
 */

/*
 *
 * Implementation of USB gxio calls.
 */

#include <linux/io.h>
#include <linux/errno.h>
#include <linux/module.h>

#include <gxio/iorpc_globals.h>
#include <gxio/iorpc_usb_host.h>
#include <gxio/kiorpc.h>
#include <gxio/usb_host.h>

int gxio_usb_host_init(gxio_usb_host_context_t * context, int usb_index,
               int is_ehci)
{
    char file[32];
    int fd;

    if (is_ehci)
        snprintf(file, sizeof(file), "usb_host/%d/iorpc/ehci",
             usb_index);
    else
        snprintf(file, sizeof(file), "usb_host/%d/iorpc/ohci",
             usb_index);

    fd = hv_dev_open((HV_VirtAddr) file, 0);
    if (fd < 0) {
        if (fd >= GXIO_ERR_MIN && fd <= GXIO_ERR_MAX)
            return fd;
        else
            return -ENODEV;
    }

    context->fd = fd;

    // Map in the MMIO space.
    context->mmio_base =
        (void __force *)iorpc_ioremap(fd, 0, HV_USB_HOST_MMIO_SIZE);

    if (context->mmio_base == NULL) {
        hv_dev_close(context->fd);
        return -ENODEV;
    }

    return 0;
}

EXPORT_SYMBOL_GPL(gxio_usb_host_init);

int gxio_usb_host_destroy(gxio_usb_host_context_t * context)
{
    iounmap((void __force __iomem *)(context->mmio_base));
    hv_dev_close(context->fd);

    context->mmio_base = NULL;
    context->fd = -1;

    return 0;
}

EXPORT_SYMBOL_GPL(gxio_usb_host_destroy);

void *gxio_usb_host_get_reg_start(gxio_usb_host_context_t * context)
{
    return context->mmio_base;
}

EXPORT_SYMBOL_GPL(gxio_usb_host_get_reg_start);

size_t gxio_usb_host_get_reg_len(gxio_usb_host_context_t * context)
{
    return HV_USB_HOST_MMIO_SIZE;
}

EXPORT_SYMBOL_GPL(gxio_usb_host_get_reg_len);