source: mainline/uspace/drv/uhci-hcd/uhci_struct/transfer_descriptor.h@ eae83aa

/*
 * Copyright (c) 2010 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
 */
#ifndef DRV_UHCI_TRANSFER_DESCRIPTOR_H
#define DRV_UHCI_TRANSFER_DESCRIPTOR_H

#include <mem.h>
#include <usb/usb.h>

#include "link_pointer.h"

/** UHCI Transfer Descriptor */
typedef struct transfer_descriptor {
        link_pointer_t next;

        volatile uint32_t status;

#define TD_STATUS_RESERVED_MASK 0xc000f800
#define TD_STATUS_SPD_FLAG ( 1 << 29 )
#define TD_STATUS_ERROR_COUNT_POS ( 27 )
#define TD_STATUS_ERROR_COUNT_MASK ( 0x3 )
#define TD_STATUS_ERROR_COUNT_DEFAULT 3
#define TD_STATUS_LOW_SPEED_FLAG ( 1 << 26 )
#define TD_STATUS_ISOCHRONOUS_FLAG ( 1 << 25 )
#define TD_STATUS_COMPLETE_INTERRUPT_FLAG ( 1 << 24 )

#define TD_STATUS_ERROR_ACTIVE ( 1 << 23 )
#define TD_STATUS_ERROR_STALLED ( 1 << 22 )
#define TD_STATUS_ERROR_BUFFER ( 1 << 21 )
#define TD_STATUS_ERROR_BABBLE ( 1 << 20 )
#define TD_STATUS_ERROR_NAK ( 1 << 19 )
#define TD_STATUS_ERROR_CRC ( 1 << 18 )
#define TD_STATUS_ERROR_BIT_STUFF ( 1 << 17 )
#define TD_STATUS_ERROR_RESERVED ( 1 << 16 )
#define TD_STATUS_ERROR_POS 16
#define TD_STATUS_ERROR_MASK ( 0xff )

#define TD_STATUS_ACTLEN_POS 0
#define TD_STATUS_ACTLEN_MASK 0x7ff

        volatile uint32_t device;

#define TD_DEVICE_MAXLEN_POS 21
#define TD_DEVICE_MAXLEN_MASK ( 0x7ff )
#define TD_DEVICE_RESERVED_FLAG ( 1 << 20 )
#define TD_DEVICE_DATA_TOGGLE_ONE_FLAG ( 1 << 19 )
#define TD_DEVICE_ENDPOINT_POS 15
#define TD_DEVICE_ENDPOINT_MASK ( 0xf )
#define TD_DEVICE_ADDRESS_POS 8
#define TD_DEVICE_ADDRESS_MASK ( 0x7f )
#define TD_DEVICE_PID_POS 0
#define TD_DEVICE_PID_MASK ( 0xff )

        volatile uint32_t buffer_ptr;

        /* there is 16 bytes of data available here, according to UHCI
         * Design guide, according to linux kernel the hardware does not care
         * we don't use it anyway
         */
} __attribute__((packed)) td_t;


void td_init(td_t *instance, int error_count, size_t size, bool toggle, bool iso,
    bool low_speed, usb_target_t target, usb_packet_id pid, void *buffer,
    td_t *next);

int td_status(td_t *instance);

static inline size_t td_act_size(td_t *instance)
{
        assert(instance);
        return
            ((instance->status >> TD_STATUS_ACTLEN_POS) + 1)
            & TD_STATUS_ACTLEN_MASK;
}

static inline bool td_is_short(td_t *instance)
{
        const size_t act_size = td_act_size(instance);
        const size_t max_size =
            ((instance->device >> TD_DEVICE_MAXLEN_POS) + 1)
            & TD_DEVICE_MAXLEN_MASK;
        return
            (instance->status | TD_STATUS_SPD_FLAG) && act_size < max_size;
}

static inline bool td_is_active(td_t *instance)
{
        assert(instance);
        return (instance->status & TD_STATUS_ERROR_ACTIVE) != 0;
}
#endif
/**
 * @}
 */