source: mainline/uspace/drv/bus/usb/ohci/endpoint_list.c@ d60115a

/*
 * 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 drvusbohci
 * @{
 */
/** @file
 * @brief OHCI driver transfer list implementation
 */

#include <assert.h>
#include <errno.h>
#include <libarch/barrier.h>

#include <usb/debug.h>
#include <usb/host/utils/malloc32.h>

#include "endpoint_list.h"

/** Initialize transfer list structures.
 *
 * @param[in] instance Memory place to use.
 * @param[in] name Name of the new list.
 * @return Error code
 *
 * Allocates memory for internal ed_t structure.
 */
int endpoint_list_init(endpoint_list_t *instance, const char *name)
{
        assert(instance);
        instance->name = name;
        instance->list_head = malloc32(sizeof(ed_t));
        if (!instance->list_head) {
                usb_log_error("Failed to allocate list head.");
                return ENOMEM;
        }
        instance->list_head_pa = addr_to_phys(instance->list_head);
        usb_log_debug2("Transfer list %s setup with ED: %p(0x%0" PRIx32 ")).",
            name, instance->list_head, instance->list_head_pa);

        ed_init(instance->list_head, NULL, NULL);
        list_initialize(&instance->endpoint_list);
        fibril_mutex_initialize(&instance->guard);
        return EOK;
}

/** Set the next list in transfer list chain.
 *
 * @param[in] instance List to lead.
 * @param[in] next List to append.
 *
 * Does not check whether this replaces an existing list.
 */
void endpoint_list_set_next(
    const endpoint_list_t *instance, const endpoint_list_t *next)
{
        assert(instance);
        assert(next);
        ed_append_ed(instance->list_head, next->list_head);
}

/** Add endpoint to the list and queue.
 *
 * @param[in] instance List to use.
 * @param[in] endpoint Endpoint to add.
 *
 * The endpoint is added to the end of the list and queue.
 */
void endpoint_list_add_ep(endpoint_list_t *instance, ohci_endpoint_t *ep)
{
        assert(instance);
        assert(ep);
        usb_log_debug2("Queue %s: Adding endpoint(%p).", instance->name, ep);

        fibril_mutex_lock(&instance->guard);

        ed_t *last_ed = NULL;
        /* Add to the hardware queue. */
        if (list_empty(&instance->endpoint_list)) {
                /* There are no active EDs */
                last_ed = instance->list_head;
        } else {
                /* There are active EDs, get the last one */
                ohci_endpoint_t *last = list_get_instance(
                    list_last(&instance->endpoint_list), ohci_endpoint_t, eplist_link);
                last_ed = last->ed;
        }
        /* Keep link */
        ep->ed->next = last_ed->next;
        /* Make sure ED is written to the memory */
        write_barrier();

        /* Add ed to the hw queue */
        ed_append_ed(last_ed, ep->ed);
        /* Make sure ED is updated */
        write_barrier();

        /* Add to the sw list */
        list_append(&ep->eplist_link, &instance->endpoint_list);

        ohci_endpoint_t *first = list_get_instance(
            list_first(&instance->endpoint_list), ohci_endpoint_t, eplist_link);
        usb_log_debug("HCD EP(%p) added to list %s, first is %p(%p).",
                ep, instance->name, first, first->ed);
        if (last_ed == instance->list_head) {
                usb_log_debug2("%s head ED(%p-0x%0" PRIx32 "): %x:%x:%x:%x.",
                    instance->name, last_ed, instance->list_head_pa,
                    last_ed->status, last_ed->td_tail, last_ed->td_head,
                    last_ed->next);
        }
        fibril_mutex_unlock(&instance->guard);
}

/** Remove endpoint from the list and queue.
 *
 * @param[in] instance List to use.
 * @param[in] endpoint Endpoint to remove.
 */
void endpoint_list_remove_ep(endpoint_list_t *instance, ohci_endpoint_t *ep)
{
        assert(instance);
        assert(instance->list_head);
        assert(ep);
        assert(ep->ed);

        fibril_mutex_lock(&instance->guard);

        usb_log_debug2("Queue %s: removing endpoint(%p).", instance->name, ep);

        const char *qpos = NULL;
        ed_t *prev_ed;
        /* Remove from the hardware queue */
        if (list_first(&instance->endpoint_list) == &ep->eplist_link) {
                /* I'm the first one here */
                prev_ed = instance->list_head;
                qpos = "FIRST";
        } else {
                ohci_endpoint_t *prev =
                    list_get_instance(ep->eplist_link.prev, ohci_endpoint_t, eplist_link);
                prev_ed = prev->ed;
                qpos = "NOT FIRST";
        }
        assert(ed_next(prev_ed) == addr_to_phys(ep->ed));
        prev_ed->next = ep->ed->next;
        /* Make sure ED is updated */
        write_barrier();

        usb_log_debug("HCD EP(%p) removed (%s) from %s, next %x.",
            ep, qpos, instance->name, ep->ed->next);

        /* Remove from the endpoint list */
        list_remove(&ep->eplist_link);
        fibril_mutex_unlock(&instance->guard);
}
/**
 * @}
 */