bus_funcs.h revision 1.2
1 /* $NetBSD: bus_funcs.h,v 1.2 2014/07/29 21:21:44 skrll Exp $ */ 2 3 /* 4 * Copyright (c) 1996, 1997, 1998, 2001 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, 9 * NASA Ames Research Center. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #ifndef _COBALT_BUS_FUNCS_H_ 34 #define _COBALT_BUS_FUNCS_H_ 35 36 /* 37 * uintN_t bus_space_read_N(bus_space_tag_t tag, 38 * bus_space_handle_t bsh, bus_size_t offset); 39 * 40 * Read a 1, 2, 4, or 8 byte quantity from bus space 41 * described by tag/handle/offset. 42 */ 43 44 #define bus_space_read_1(t, h, o) \ 45 ((void) t, (*(volatile uint8_t *)((h) + (o)))) 46 47 #define bus_space_read_2(t, h, o) \ 48 ((void) t, (*(volatile uint16_t *)((h) + (o)))) 49 50 #define bus_space_read_4(t, h, o) \ 51 ((void) t, (*(volatile uint32_t *)((h) + (o)))) 52 53 #if 0 /* Cause a link error for bus_space_read_8 */ 54 #define bus_space_read_8(t, h, o) !!! bus_space_read_8 unimplemented !!! 55 #endif 56 57 /* 58 * void bus_space_write_N(bus_space_tag_t tag, 59 * bus_space_handle_t bsh, bus_size_t offset, 60 * uintN_t value); 61 * 62 * Write the 1, 2, 4, or 8 byte value `value' to bus space 63 * described by tag/handle/offset. 64 */ 65 66 #define bus_space_write_1(t, h, o, v) \ 67 do { \ 68 (void) t; \ 69 *(volatile uint8_t *)((h) + (o)) = (v); \ 70 } while (0) 71 72 #define bus_space_write_2(t, h, o, v) \ 73 do { \ 74 (void) t; \ 75 *(volatile uint16_t *)((h) + (o)) = (v); \ 76 } while (0) 77 78 #define bus_space_write_4(t, h, o, v) \ 79 do { \ 80 (void) t; \ 81 *(volatile uint32_t *)((h) + (o)) = (v); \ 82 } while (0) 83 84 #if 0 /* Cause a link error for bus_space_write_8 */ 85 #define bus_space_write_8 !!! bus_space_write_8 not implemented !!! 86 #endif 87 88 /* 89 * Operations which handle byte stream data on word access. 90 * 91 * These functions are defined to resolve endian mismatch, by either 92 * - When normal (i.e. stream-less) operations perform byte swap 93 * to resolve endian mismatch, these functions bypass the byte swap. 94 * or 95 * - When bus bridge performs automatic byte swap, these functions 96 * perform byte swap once more, to cancel the bridge's behavior. 97 * 98 * Currently these are just same as normal operations, since all 99 * supported buses are same endian with CPU (i.e. little-endian). 100 * 101 */ 102 #define bus_space_read_stream_2(tag, bsh, offset) \ 103 bus_space_read_2(tag, bsh, offset) 104 #define bus_space_read_stream_4(tag, bsh, offset) \ 105 bus_space_read_4(tag, bsh, offset) 106 #define bus_space_read_stream_8(tag, bsh, offset) \ 107 bus_space_read_8(tag, bsh, offset) 108 #define bus_space_read_multi_stream_2(tag, bsh, offset, datap, count) \ 109 bus_space_read_multi_2(tag, bsh, offset, datap, count) 110 #define bus_space_read_multi_stream_4(tag, bsh, offset, datap, count) \ 111 bus_space_read_multi_4(tag, bsh, offset, datap, count) 112 #define bus_space_read_multi_stream_8(tag, bsh, offset, datap, count) \ 113 bus_space_read_multi_8(tag, bsh, offset, datap, count) 114 #define bus_space_read_region_stream_2(tag, bsh, offset, datap, count) \ 115 bus_space_read_region_2(tag, bsh, offset, datap, count) 116 #define bus_space_read_region_stream_4(tag, bsh, offset, datap, count) \ 117 bus_space_read_region_4(tag, bsh, offset, datap, count) 118 #define bus_space_read_region_stream_8(tag, bsh, offset, datap, count) \ 119 bus_space_read_region_8(tag, bsh, offset, datap, count) 120 #define bus_space_write_stream_2(tag, bsh, offset, data) \ 121 bus_space_write_2(tag, bsh, offset, data) 122 #define bus_space_write_stream_4(tag, bsh, offset, data) \ 123 bus_space_write_4(tag, bsh, offset, data) 124 #define bus_space_write_stream_8(tag, bsh, offset, data) \ 125 bus_space_write_8(tag, bsh, offset, data) 126 #define bus_space_write_multi_stream_2(tag, bsh, offset, datap, count) \ 127 bus_space_write_multi_2(tag, bsh, offset, datap, count) 128 #define bus_space_write_multi_stream_4(tag, bsh, offset, datap, count) \ 129 bus_space_write_multi_4(tag, bsh, offset, datap, count) 130 #define bus_space_write_multi_stream_8(tag, bsh, offset, datap, count) \ 131 bus_space_write_multi_8(tag, bsh, offset, datap, count) 132 #define bus_space_write_region_stream_2(tag, bsh, offset, datap, count) \ 133 bus_space_write_region_2(tag, bsh, offset, datap, count) 134 #define bus_space_write_region_stream_4(tag, bsh, offset, datap, count) \ 135 bus_space_write_region_4(tag, bsh, offset, datap, count) 136 #define bus_space_write_region_stream_8(tag, bsh, offset, datap, count) \ 137 bus_space_write_region_8(tag, bsh, offset, datap, count) 138 #define bus_space_write_region_stream_2(tag, bsh, offset, datap, count) \ 139 bus_space_write_region_2(tag, bsh, offset, datap, count) 140 #define bus_space_write_region_stream_4(tag, bsh, offset, datap, count) \ 141 bus_space_write_region_4(tag, bsh, offset, datap, count) 142 #define bus_space_write_region_stream_8(tag, bsh, offset, datap, count) \ 143 bus_space_write_region_8(tag, bsh, offset, datap, count) 144 #define bus_space_set_multi_stream_2(tag, bsh, offset, data, count) \ 145 bus_space_set_multi_2(tag, bsh, offset, data, count) 146 #define bus_space_set_multi_stream_4(tag, bsh, offset, data, count) \ 147 bus_space_set_multi_4(tag, bsh, offset, data, count) 148 #define bus_space_set_multi_stream_8(tag, bsh, offset, data, count) \ 149 bus_space_set_multi_8(tag, bsh, offset, data, count) 150 #define bus_space_set_region_stream_2(tag, bsh, offset, data, count) \ 151 bus_space_set_region_2(tag, bsh, offset, data, count) 152 #define bus_space_set_region_stream_4(tag, bsh, offset, data, count) \ 153 bus_space_set_region_4(tag, bsh, offset, data, count) 154 #define bus_space_set_region_stream_8(tag, bsh, offset, data, count) \ 155 bus_space_set_region_8(tag, bsh, offset, data, count) 156 157 /* 158 * Bus read/write barrier methods. 159 * 160 * void bus_space_barrier(bus_space_tag_t tag, 161 * bus_space_handle_t bsh, bus_size_t offset, 162 * bus_size_t len, int flags); 163 * 164 * On the MIPS, we just flush the write buffer. 165 */ 166 #define bus_space_barrier(t, h, o, l, f) \ 167 ((void)((void)(t), (void)(h), (void)(o), (void)(l), (void)(f), \ 168 wbflush())) 169 170 #include <mips/bus_dma_funcs.h> 171 172 #endif /* _COBALT_BUS_FUNCS_H_ */ 173
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