| 1 | /*
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| 2 | * Copyright (c) 2011 Jan Vesely
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 | /** @addtogroup usb
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| 29 | * @{
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| 30 | */
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| 31 | /** @file
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| 32 | * @brief UHCI driver
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| 33 | */
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| 34 | #include <errno.h>
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| 35 |
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| 36 | #include <usb/debug.h>
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| 37 |
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| 38 | #include "transfer_list.h"
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| 39 |
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| 40 | int transfer_list_init(transfer_list_t *instance, const char *name)
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| 41 | {
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| 42 | assert(instance);
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| 43 | instance->next = NULL;
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| 44 | instance->name = name;
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| 45 | instance->queue_head = queue_head_get();
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| 46 | if (!instance->queue_head) {
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| 47 | usb_log_error("Failed to allocate queue head.\n");
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| 48 | return ENOMEM;
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| 49 | }
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| 50 | instance->queue_head_pa = (uintptr_t)addr_to_phys(instance->queue_head);
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| 51 |
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| 52 | queue_head_init(instance->queue_head);
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| 53 | return EOK;
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| 54 | }
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| 55 | /*----------------------------------------------------------------------------*/
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| 56 | void transfer_list_set_next(transfer_list_t *instance, transfer_list_t *next)
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| 57 | {
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| 58 | assert(instance);
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| 59 | assert(next);
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| 60 | instance->next = next;
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| 61 | if (!instance->queue_head)
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| 62 | return;
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| 63 | queue_head_add_next(instance->queue_head, next->queue_head_pa);
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| 64 | }
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| 65 | /*----------------------------------------------------------------------------*/
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| 66 | void transfer_list_add_tracker(transfer_list_t *instance, tracker_t *tracker)
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| 67 | {
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| 68 | assert(instance);
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| 69 | assert(tracker);
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| 70 |
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| 71 | uint32_t pa = (uintptr_t)addr_to_phys(tracker->td);
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| 72 | assert((pa & LINK_POINTER_ADDRESS_MASK) == pa);
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| 73 |
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| 74 | if (instance->queue_head->element & LINK_POINTER_TERMINATE_FLAG) {
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| 75 | /* there is nothing scheduled */
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| 76 | instance->last_tracker = tracker;
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| 77 | instance->queue_head->element = pa;
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| 78 | return;
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| 79 | }
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| 80 | /* now we can be sure that last_tracker is a valid pointer */
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| 81 | instance->last_tracker->td->next = pa;
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| 82 | instance->last_tracker = tracker;
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| 83 |
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| 84 | /* check again, may be use atomic compare and swap */
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| 85 | // if (instance->queue_head->element & LINK_POINTER_TERMINATE_FLAG) {
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| 86 | // instance->queue_head->element = pa;
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| 87 | // }
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| 88 | }
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| 89 | /**
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| 90 | * @}
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| 91 | */
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