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| 2 | /*
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| 3 | * Copyright (c) 2010 Jan Vesely
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| 4 | * All rights reserved.
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| 5 | *
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| 6 | * Redistribution and use in source and binary forms, with or without
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| 7 | * modification, are permitted provided that the following conditions
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| 8 | * are met:
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| 9 | *
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| 10 | * - Redistributions of source code must retain the above copyright
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| 11 | * notice, this list of conditions and the following disclaimer.
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| 12 | * - Redistributions in binary form must reproduce the above copyright
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| 13 | * notice, this list of conditions and the following disclaimer in the
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| 14 | * documentation and/or other materials provided with the distribution.
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| 15 | * - The name of the author may not be used to endorse or promote products
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| 16 | * derived from this software without specific prior written permission.
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| 17 | *
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| 18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 19 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 20 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 21 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 23 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 24 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 25 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 27 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 28 | */
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| 29 | /** @addtogroup usb
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| 30 | * @{
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| 31 | */
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| 32 | /** @file
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| 33 | * @brief UHCI driver
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| 34 | */
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| 35 | #ifndef DRV_UHCI_QH_H
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| 36 | #define DRV_UHCI_QH_H
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| 37 |
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| 38 | /* libc */
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| 39 | #include <assert.h>
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| 40 |
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| 41 | #include "link_pointer.h"
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| 42 | #include "utils/malloc32.h"
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| 43 |
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| 44 | typedef struct queue_head {
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| 45 | volatile link_pointer_t next;
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| 46 | volatile link_pointer_t element;
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| 47 | } __attribute__((packed)) qh_t;
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| 48 | /*----------------------------------------------------------------------------*/
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| 49 | static inline void qh_init(qh_t *instance)
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| 50 | {
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| 51 | assert(instance);
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| 52 |
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| 53 | instance->element = 0 | LINK_POINTER_TERMINATE_FLAG;
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| 54 | instance->next = 0 | LINK_POINTER_TERMINATE_FLAG;
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| 55 | }
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| 56 | /*----------------------------------------------------------------------------*/
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| 57 | static inline void qh_set_next_qh(qh_t *instance, uint32_t pa)
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| 58 | {
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| 59 | /* address is valid and not terminal */
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| 60 | if (pa && ((pa & LINK_POINTER_TERMINATE_FLAG) == 0)) {
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| 61 | instance->next = (pa & LINK_POINTER_ADDRESS_MASK)
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| 62 | | LINK_POINTER_QUEUE_HEAD_FLAG;
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| 63 | } else {
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| 64 | instance->next = 0 | LINK_POINTER_TERMINATE_FLAG;
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| 65 | }
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| 66 | }
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| 67 | /*----------------------------------------------------------------------------*/
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| 68 | static inline void qh_set_element_qh(qh_t *instance, uint32_t pa)
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| 69 | {
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| 70 | /* address is valid and not terminal */
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| 71 | if (pa && ((pa & LINK_POINTER_TERMINATE_FLAG) == 0)) {
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| 72 | instance->element = (pa & LINK_POINTER_ADDRESS_MASK)
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| 73 | | LINK_POINTER_QUEUE_HEAD_FLAG;
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| 74 | } else {
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| 75 | instance->element = 0 | LINK_POINTER_TERMINATE_FLAG;
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| 76 | }
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| 77 | }
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| 78 | /*----------------------------------------------------------------------------*/
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| 79 | static inline void qh_set_element_td(qh_t *instance, uint32_t pa)
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| 80 | {
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| 81 | if (pa && ((pa & LINK_POINTER_TERMINATE_FLAG) == 0)) {
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| 82 | instance->element = (pa & LINK_POINTER_ADDRESS_MASK);
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| 83 | } else {
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| 84 | instance->element = 0 | LINK_POINTER_TERMINATE_FLAG;
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| 85 | }
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| 86 | }
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| 87 |
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| 88 | #endif
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| 89 | /**
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| 90 | * @}
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| 91 | */
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