source: mainline/uspace/drv/uhci-hcd/uhci_struct/transfer_descriptor.c@ 8f198c9

/*
 * 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 <usb/debug.h>

#include "transfer_descriptor.h"
#include "utils/malloc32.h"

void transfer_descriptor_init(transfer_descriptor_t *instance,
    int error_count, size_t size, bool toggle, bool isochronous,
    usb_target_t target, int pid, void *buffer)
{
        assert(instance);

        instance->next = 0 | LINK_POINTER_TERMINATE_FLAG;

        instance->status = 0
          | ((error_count & TD_STATUS_ERROR_COUNT_MASK) << TD_STATUS_ERROR_COUNT_POS)
          | TD_STATUS_ERROR_ACTIVE;

        assert(size < 1024);
        instance->device = 0
                | (((size - 1) & TD_DEVICE_MAXLEN_MASK) << TD_DEVICE_MAXLEN_POS)
                | (toggle ? TD_DEVICE_DATA_TOGGLE_ONE_FLAG : 0)
                | ((target.address & TD_DEVICE_ADDRESS_MASK) << TD_DEVICE_ADDRESS_POS)
                | ((target.endpoint & TD_DEVICE_ENDPOINT_MASK) << TD_DEVICE_ENDPOINT_POS)
                | ((pid & TD_DEVICE_PID_MASK) << TD_DEVICE_PID_POS);

        instance->buffer_ptr = 0;

        if (size) {
                instance->buffer_ptr = (uintptr_t)addr_to_phys(buffer);
        }

        usb_log_info("Created TD: %X:%X:%X:%X(%p).\n",
                instance->next, instance->status, instance->device,
          instance->buffer_ptr, buffer);
#if 0
        if (size) {
                unsigned char * buff = buffer;
                uhci_print_verbose("TD Buffer dump(%p-%dB): ", buffer, size);
                unsigned i = 0;
                /* TODO: Verbose? */
                for (; i < size; ++i) {
                        printf((i & 1) ? "%x " : "%x", buff[i]);
                }
                printf("\n");
        }
#endif
}
/*----------------------------------------------------------------------------*/
int transfer_descriptor_status(transfer_descriptor_t *instance)
{
        assert(instance);

        if ((instance->status & TD_STATUS_ERROR_STALLED) != 0)
                return EIO;

        if ((instance->status & TD_STATUS_ERROR_CRC) != 0)
                return EAGAIN;

        if ((instance->status & TD_STATUS_ERROR_BUFFER) != 0)
                return EAGAIN;

        if ((instance->status & TD_STATUS_ERROR_BABBLE) != 0)
                return EIO;

        if ((instance->status & TD_STATUS_ERROR_NAK) != 0)
                return EAGAIN;

        if ((instance->status & TD_STATUS_ERROR_BIT_STUFF) != 0)
                return EAGAIN;

        return EOK;
}
/**
 * @}
 */