transfer_descriptor.c

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/*
 * 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.
 */
#include <errno.h>
#include <usb/debug.h>

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

void td_init(td_t *instance, int err_count, size_t size, bool toggle, bool iso,
    bool low_speed, usb_target_t target, usb_packet_id pid, void *buffer,
    td_t *next)
{
        assert(instance);
        assert(size < 1024);
        assert((pid == USB_PID_SETUP) || (pid == USB_PID_IN)
            || (pid == USB_PID_OUT));

        const uint32_t next_pa = addr_to_phys(next);
        assert((next_pa & LINK_POINTER_ADDRESS_MASK) == next_pa);

        instance->next = 0
            | LINK_POINTER_VERTICAL_FLAG
            | (next_pa ? next_pa : LINK_POINTER_TERMINATE_FLAG);

        instance->status = 0
            | ((err_count & TD_STATUS_ERROR_COUNT_MASK)
                << TD_STATUS_ERROR_COUNT_POS)
            | (low_speed ? TD_STATUS_LOW_SPEED_FLAG : 0)
            | (iso ? TD_STATUS_ISOCHRONOUS_FLAG : 0)
            | TD_STATUS_ERROR_ACTIVE;

        if (pid == USB_PID_IN && !iso) {
                instance->status |= TD_STATUS_SPD_FLAG;
        }

        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 = addr_to_phys(buffer);

        usb_log_debug2("Created TD(%p): %X:%X:%X:%X(%p).\n",
            instance, instance->next, instance->status, instance->device,
            instance->buffer_ptr, buffer);
        td_print_status(instance);
        if (pid == USB_PID_SETUP) {
                usb_log_debug("SETUP BUFFER: %s\n",
                    usb_debug_str_buffer(buffer, 8, 8));
        }
}
/*----------------------------------------------------------------------------*/
int td_status(td_t *instance)
{
        assert(instance);

        /* This is hc internal error it should never be reported. */
        if ((instance->status & TD_STATUS_ERROR_BIT_STUFF) != 0)
                return EAGAIN;

        /* CRC or timeout error, like device not present or bad data,
         * it won't be reported unless err count reached zero */
        if ((instance->status & TD_STATUS_ERROR_CRC) != 0)
                return EBADCHECKSUM;

        /* HC does not end transactions on these, it should never be reported */
        if ((instance->status & TD_STATUS_ERROR_NAK) != 0)
                return EAGAIN;

        /* Buffer overrun or underrun */
        if ((instance->status & TD_STATUS_ERROR_BUFFER) != 0)
                return ERANGE;

        /* Device babble is something serious */
        if ((instance->status & TD_STATUS_ERROR_BABBLE) != 0)
                return EIO;

        /* Stall might represent err count reaching zero or stall response from
         * the device. If err count reached zero, one of the above is reported*/
        if ((instance->status & TD_STATUS_ERROR_STALLED) != 0)
                return ESTALL;

        return EOK;
}
/*----------------------------------------------------------------------------*/
void td_print_status(td_t *instance)
{
        assert(instance);
        const uint32_t s = instance->status;
        usb_log_debug2("TD(%p) status(%#" PRIx32 "):%s %d,%s%s%s%s%s%s%s%s%s%s%s %zu.\n",
            instance, instance->status,
            (s & TD_STATUS_SPD_FLAG) ? " SPD," : "",
            (s >> TD_STATUS_ERROR_COUNT_POS) & TD_STATUS_ERROR_COUNT_MASK,
            (s & TD_STATUS_LOW_SPEED_FLAG) ? " LOW SPEED," : "",
            (s & TD_STATUS_ISOCHRONOUS_FLAG) ? " ISOCHRONOUS," : "",
            (s & TD_STATUS_IOC_FLAG) ? " IOC," : "",
            (s & TD_STATUS_ERROR_ACTIVE) ? " ACTIVE," : "",
            (s & TD_STATUS_ERROR_STALLED) ? " STALLED," : "",
            (s & TD_STATUS_ERROR_BUFFER) ? " BUFFER," : "",
            (s & TD_STATUS_ERROR_BABBLE) ? " BABBLE," : "",
            (s & TD_STATUS_ERROR_NAK) ? " NAK," : "",
            (s & TD_STATUS_ERROR_CRC) ? " CRC/TIMEOUT," : "",
            (s & TD_STATUS_ERROR_BIT_STUFF) ? " BIT_STUFF," : "",
            (s & TD_STATUS_ERROR_RESERVED) ? " RESERVED," : "",
            td_act_size(instance)
        );
}

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