ar71xx_bus_space_reversed.c revision 202173
1/*- 2 * Copyright (c) 2009, Oleksandr Tymoshenko <gonzo@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice unmodified, this list of conditions, and the following 10 * disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD: head/sys/mips/atheros/ar71xx_bus_space_reversed.c 202173 2010-01-12 21:17:36Z imp $"); 29 30#include <sys/param.h> 31#include <sys/systm.h> 32#include <sys/bus.h> 33 34#include <machine/bus.h> 35#include <mips/atheros/ar71xx_bus_space_reversed.h> 36 37static bs_r_1_proto(reversed); 38static bs_r_2_proto(reversed); 39static bs_w_1_proto(reversed); 40static bs_w_2_proto(reversed); 41 42/* 43 * Bus space that handles offsets in word for 1/2 bytes read/write access. 44 * Byte order of values is handled by device drivers itself. 45 */ 46static struct bus_space bus_space_reversed = { 47 /* cookie */ 48 (void *) 0, 49 50 /* mapping/unmapping */ 51 generic_bs_map, 52 generic_bs_unmap, 53 generic_bs_subregion, 54 55 /* allocation/deallocation */ 56 NULL, 57 NULL, 58 59 /* barrier */ 60 generic_bs_barrier, 61 62 /* read (single) */ 63 reversed_bs_r_1, 64 reversed_bs_r_2, 65 generic_bs_r_4, 66 NULL, 67 68 /* read multiple */ 69 generic_bs_rm_1, 70 generic_bs_rm_2, 71 generic_bs_rm_4, 72 NULL, 73 74 /* read region */ 75 generic_bs_rr_1, 76 generic_bs_rr_2, 77 generic_bs_rr_4, 78 NULL, 79 80 /* write (single) */ 81 reversed_bs_w_1, 82 reversed_bs_w_2, 83 generic_bs_w_4, 84 NULL, 85 86 /* write multiple */ 87 generic_bs_wm_1, 88 generic_bs_wm_2, 89 generic_bs_wm_4, 90 NULL, 91 92 /* write region */ 93 NULL, 94 generic_bs_wr_2, 95 generic_bs_wr_4, 96 NULL, 97 98 /* set multiple */ 99 NULL, 100 NULL, 101 NULL, 102 NULL, 103 104 /* set region */ 105 NULL, 106 generic_bs_sr_2, 107 generic_bs_sr_4, 108 NULL, 109 110 /* copy */ 111 NULL, 112 generic_bs_c_2, 113 NULL, 114 NULL, 115 116 /* read (single) stream */ 117 generic_bs_r_1, 118 generic_bs_r_2, 119 generic_bs_r_4, 120 NULL, 121 122 /* read multiple stream */ 123 generic_bs_rm_1, 124 generic_bs_rm_2, 125 generic_bs_rm_4, 126 NULL, 127 128 /* read region stream */ 129 generic_bs_rr_1, 130 generic_bs_rr_2, 131 generic_bs_rr_4, 132 NULL, 133 134 /* write (single) stream */ 135 generic_bs_w_1, 136 generic_bs_w_2, 137 generic_bs_w_4, 138 NULL, 139 140 /* write multiple stream */ 141 generic_bs_wm_1, 142 generic_bs_wm_2, 143 generic_bs_wm_4, 144 NULL, 145 146 /* write region stream */ 147 NULL, 148 generic_bs_wr_2, 149 generic_bs_wr_4, 150 NULL, 151}; 152 153bus_space_tag_t ar71xx_bus_space_reversed = &bus_space_reversed; 154 155static uint8_t 156reversed_bs_r_1(void *t, bus_space_handle_t h, bus_size_t o) 157{ 158 159 return readb(h + (o &~ 3) + (3 - (o & 3))); 160} 161 162static void 163reversed_bs_w_1(void *t, bus_space_handle_t h, bus_size_t o, u_int8_t v) 164{ 165 166 writeb(h + (o &~ 3) + (3 - (o & 3)), v); 167} 168 169static uint16_t 170reversed_bs_r_2(void *t, bus_space_handle_t h, bus_size_t o) 171{ 172 173 return readw(h + (o &~ 3) + (2 - (o & 3))); 174} 175 176static void 177reversed_bs_w_2(void *t, bus_space_handle_t h, bus_size_t o, uint16_t v) 178{ 179 180 writew(h + (o &~ 3) + (2 - (o & 3)), v); 181} 182