source: mainline/uspace/drv/uhci-rhd/root_hub.c@ 7ffe82f

/*
 * Copyright (c) 2011 Jan Vesely
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
/** @addtogroup usb
 * @{
 */
/** @file
 * @brief UHCI driver
 */
#include <errno.h>
#include <stdint.h>
#include <ddi.h>
#include <devman.h>
#include <usb/debug.h>

#include "root_hub.h"

/** Initializes UHCI root hub instance.
 *
 * @param[in] instance Driver memory structure to use.
 * @param[in] addr Address of I/O registers.
 * @param[in] size Size of available I/O space.
 * @param[in] rh Pointer to ddf instance fo the root hub driver.
 * @return Error code.
 */
int uhci_root_hub_init(
  uhci_root_hub_t *instance, void *addr, size_t size, ddf_dev_t *rh)
{
        assert(instance);
        assert(rh);
        int ret;

        /* Allow access to root hub port registers */
        assert(sizeof(port_status_t) * UHCI_ROOT_HUB_PORT_COUNT <= size);
        port_status_t *regs;
        ret = pio_enable(addr, size, (void**)&regs);
        if (ret < 0) {
                usb_log_error(
                    "Failed to gain access to port registers at %p\n", regs);
                return ret;
        }

        /* add fibrils for periodic port checks */
        unsigned i = 0;
        for (; i < UHCI_ROOT_HUB_PORT_COUNT; ++i) {
                /* NOTE: mind pointer arithmetics here */
                ret = uhci_port_init(
                    &instance->ports[i], regs + i, i, ROOT_HUB_WAIT_USEC, rh);
                if (ret != EOK) {
                        unsigned j = 0;
                        for (;j < i; ++j)
                                uhci_port_fini(&instance->ports[j]);
                        return ret;
                }
        }

        return EOK;
}
/*----------------------------------------------------------------------------*/
/** Finishes UHCI root hub instance.
 *
 * @param[in] instance Driver memory structure to use.
 * @return Error code.
 */
int uhci_root_hub_fini(uhci_root_hub_t* instance)
{
        assert(instance);
        unsigned i = 0;
        for (; i < UHCI_ROOT_HUB_PORT_COUNT; ++i) {
                uhci_port_fini(&instance->ports[i]);
        }
        return EOK;
}
/*----------------------------------------------------------------------------*/
/**
 * @}
 */