| 1 | /*
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| 2 | * Copyright (c) 2010 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 drv usbuhcihc
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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 | #ifndef DRV_UHCI_QH_H
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| 35 | #define DRV_UHCI_QH_H
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| 36 |
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| 37 | /* libc */
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| 38 | #include <assert.h>
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| 39 |
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| 40 | #include "link_pointer.h"
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| 41 |
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| 42 | typedef struct queue_head {
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| 43 | volatile link_pointer_t next;
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| 44 | volatile link_pointer_t element;
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| 45 | } __attribute__((packed)) qh_t;
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| 46 | /*----------------------------------------------------------------------------*/
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| 47 | /** Initialize queue head structure
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| 48 | *
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| 49 | * @param[in] instance qh_t structure to initialize.
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| 50 | *
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| 51 | * Sets both pointer to terminal NULL.
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| 52 | */
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| 53 | static inline void qh_init(qh_t *instance)
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| 54 | {
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| 55 | assert(instance);
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| 56 |
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| 57 | instance->element = 0 | LINK_POINTER_TERMINATE_FLAG;
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| 58 | instance->next = 0 | LINK_POINTER_TERMINATE_FLAG;
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| 59 | }
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| 60 | /*----------------------------------------------------------------------------*/
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| 61 | /** Set queue head next pointer
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| 62 | *
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| 63 | * @param[in] instance qh_t structure to use.
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| 64 | * @param[in] pa Physical address of the next queue head.
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| 65 | *
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| 66 | * Adds proper flag. If the pointer is NULL or terminal, sets next to terminal
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| 67 | * NULL.
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| 68 | */
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| 69 | static inline void qh_set_next_qh(qh_t *instance, uint32_t pa)
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| 70 | {
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| 71 | /* Address is valid and not terminal */
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| 72 | if (pa && ((pa & LINK_POINTER_TERMINATE_FLAG) == 0)) {
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| 73 | instance->next = LINK_POINTER_QH(pa);
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| 74 | } else {
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| 75 | instance->next = LINK_POINTER_TERM;
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| 76 | }
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| 77 | }
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| 78 | /*----------------------------------------------------------------------------*/
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| 79 | /** Set queue head element pointer
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| 80 | *
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| 81 | * @param[in] instance qh_t structure to initialize.
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| 82 | * @param[in] pa Physical address of the next queue head.
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| 83 | *
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| 84 | * Adds proper flag. If the pointer is NULL or terminal, sets element
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| 85 | * to terminal NULL.
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| 86 | */
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| 87 | static inline void qh_set_element_qh(qh_t *instance, uint32_t pa)
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| 88 | {
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| 89 | /* Address is valid and not terminal */
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| 90 | if (pa && ((pa & LINK_POINTER_TERMINATE_FLAG) == 0)) {
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| 91 | instance->element = LINK_POINTER_QH(pa);
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| 92 | } else {
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| 93 | instance->element = LINK_POINTER_TERM;
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| 94 | }
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| 95 | }
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| 96 | /*----------------------------------------------------------------------------*/
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| 97 | /** Set queue head element pointer
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| 98 | *
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| 99 | * @param[in] instance qh_t structure to initialize.
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| 100 | * @param[in] pa Physical address of the TD structure.
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| 101 | *
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| 102 | * Adds proper flag. If the pointer is NULL or terminal, sets element
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| 103 | * to terminal NULL.
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| 104 | */
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| 105 | static inline void qh_set_element_td(qh_t *instance, uint32_t pa)
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| 106 | {
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| 107 | if (pa && ((pa & LINK_POINTER_TERMINATE_FLAG) == 0)) {
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| 108 | instance->element = LINK_POINTER_TD(pa);
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| 109 | } else {
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| 110 | instance->element = LINK_POINTER_TERM;
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| 111 | }
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| 112 | }
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| 113 |
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| 114 | #endif
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| 115 | /**
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| 116 | * @}
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| 117 | */
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