1/* $OpenBSD: rbus.c,v 1.16 2010/09/22 02:28:37 jsg Exp $ */ 2/* $NetBSD: rbus.c,v 1.3 1999/11/06 06:20:53 soren Exp $ */ 3/* 4 * Copyright (c) 1999 5 * HAYAKAWA Koichi. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28#include <sys/param.h> 29#include <sys/systm.h> 30#include <sys/device.h> 31#include <sys/malloc.h> 32#include <sys/extent.h> 33 34#include <machine/bus.h> 35 36#include <dev/cardbus/rbus.h> 37 38/* #define RBUS_DEBUG */ 39 40#if defined RBUS_DEBUG 41#define STATIC 42#define DPRINTF(a) printf a 43#else 44#ifdef DDB 45#define STATIC 46#else 47#define STATIC static 48#endif 49#define DPRINTF(a) 50#endif 51 52 53int 54rbus_space_alloc(rbus_tag_t rbt, bus_addr_t addr, bus_size_t size, 55 bus_addr_t mask, bus_addr_t align, int flags, bus_addr_t *addrp, 56 bus_space_handle_t *bshp) 57{ 58 return (rbus_space_alloc_subregion(rbt, rbt->rb_start, rbt->rb_end, 59 addr, size, mask, align, flags, addrp, bshp)); 60} 61 62int 63rbus_space_alloc_subregion(rbus_tag_t rbt, bus_addr_t substart, 64 bus_addr_t subend, bus_addr_t addr, bus_size_t size, 65 bus_addr_t mask, bus_addr_t align, int flags, bus_addr_t *addrp, 66 bus_space_handle_t *bshp) 67{ 68 bus_addr_t decodesize = mask + 1; 69 bus_addr_t boundary, search_addr; 70 int val; 71 u_long result; 72 int exflags = EX_FAST | EX_NOWAIT | EX_MALLOCOK; 73 74 DPRINTF(("rbus_space_alloc: addr %lx, size %lx, mask %lx, align %lx\n", 75 (u_long)addr, (u_long)size, (u_long)mask, (u_long)align)); 76 77 if (mask == 0) { 78 /* FULL Decode */ 79 decodesize = 0; 80 } 81 82 if (rbt->rb_flags == RBUS_SPACE_SHARE || 83 rbt->rb_flags == RBUS_SPACE_DEDICATE) { 84 /* rbt has its own sh_extent */ 85 86 /* sanity check: the subregion [substart, subend] should be 87 smaller than the region included in sh_extent */ 88 if (substart < rbt->rb_ext->ex_start || 89 subend > rbt->rb_ext->ex_end) { 90 DPRINTF(("rbus: out of range\n")); 91 return (1); 92 } 93 94 if (decodesize == align) { 95 if (extent_alloc_subregion(rbt->rb_ext, substart, 96 subend, size, align, 0, 0, exflags, &result)) 97 return (1); 98 } else if (decodesize == 0) { 99 /* maybe, the register is overflowed. */ 100 101 if (extent_alloc_subregion(rbt->rb_ext, addr, 102 addr + size, size, 1, 0, 0, exflags, &result)) 103 return (1); 104 } else { 105 boundary = decodesize > align ? decodesize : align; 106 107 search_addr = (substart & ~(boundary - 1)) + addr; 108 109 if (search_addr < substart) 110 search_addr += boundary; 111 112 val = 1; 113 for (; search_addr + size <= subend; 114 search_addr += boundary) { 115 val = extent_alloc_subregion( 116 rbt->rb_ext,search_addr, 117 search_addr + size, size, align, 0, 0, 118 exflags, &result); 119 DPRINTF(("rbus: trying [%lx:%lx] %lx\n", 120 (u_long)search_addr, 121 (u_long)search_addr + size, 122 (u_long)align)); 123 if (val == 0) 124 break; 125 } 126 127 if (val != 0) { 128 /* no space found */ 129 DPRINTF(("rbus: no space found\n")); 130 return (1); 131 } 132 } 133 134 if (md_space_map(rbt, result, size, flags, bshp)) { 135 /* map failed */ 136 extent_free(rbt->rb_ext, result, size, exflags); 137 return (1); 138 } 139 140 if (addrp != NULL) 141 *addrp = result; 142 return (0); 143 } else { 144 /* error!! */ 145 DPRINTF(("rbus: no rbus type\n")); 146 return (1); 147 } 148} 149 150int 151rbus_space_free(rbus_tag_t rbt, bus_space_handle_t bsh, bus_size_t size, 152 bus_addr_t *addrp) 153{ 154 int exflags = EX_FAST | EX_NOWAIT; 155 bus_addr_t addr; 156 int status = 1; 157 158 if (rbt->rb_flags == RBUS_SPACE_SHARE || 159 rbt->rb_flags == RBUS_SPACE_DEDICATE) { 160 md_space_unmap(rbt, bsh, size, &addr); 161 162 extent_free(rbt->rb_ext, addr, size, exflags); 163 164 status = 0; 165 } else { 166 /* error. INVALID rbustag */ 167 status = 1; 168 } 169 170 if (addrp != NULL) 171 *addrp = addr; 172 173 return (status); 174} 175 176/* 177 * rbus_tag_t 178 * rbus_new_body(bus_space_tag_t bt, 179 * struct extent *ex, bus_addr_t start, bus_size_t end, 180 * int flags) 181 * 182 */ 183rbus_tag_t 184rbus_new_body(bus_space_tag_t bt, struct extent *ex, 185 bus_addr_t start, bus_addr_t end, int flags) 186{ 187 rbus_tag_t rb; 188 189 if ((rb = (rbus_tag_t)malloc(sizeof(struct rbustag), M_DEVBUF, 190 M_NOWAIT)) == NULL) { 191 panic("no memory for rbus instance"); 192 } 193 194 rb->rb_bt = bt; 195 rb->rb_start = start; 196 rb->rb_end = end; 197 rb->rb_flags = flags; 198 rb->rb_ext = ex; 199 200 DPRINTF(("rbus_new_body: [%lx, %lx] type %s name [%s]\n", 201 (u_long)start, (u_long)end, 202 flags == RBUS_SPACE_SHARE ? "share" : 203 flags == RBUS_SPACE_DEDICATE ? "dedicated" : "invalid", 204 ex != NULL ? ex->ex_name : "noname")); 205 206 return (rb); 207} 208 209/* 210 * rbus_tag_t rbus_new_root_delegate(bus_space_tag, bus_addr_t, 211 * bus_size_t) 212 * 213 * This function makes a root rbus instance. 214 */ 215rbus_tag_t 216rbus_new_root_delegate(bus_space_tag_t bt, bus_addr_t start, bus_size_t size) 217{ 218 rbus_tag_t rb; 219 struct extent *ex; 220 221 if ((ex = extent_create("rbus root", start, start + size, M_DEVBUF, 222 NULL, 0, EX_NOCOALESCE|EX_NOWAIT)) == NULL) 223 return (NULL); 224 225 rb = rbus_new_body(bt, ex, start, start + size, 226 RBUS_SPACE_DEDICATE); 227 228 if (rb == NULL) 229 extent_destroy(ex); 230 231 return (rb); 232} 233 234/* 235 * rbus_tag_t rbus_new_root_share(bus_space_tag, struct extent *, 236 * bus_addr_t, bus_size_t) 237 * 238 * This function makes a root rbus instance. 239 */ 240rbus_tag_t 241rbus_new_root_share(bus_space_tag_t bt, struct extent *ex, bus_addr_t start, 242 bus_size_t size) 243{ 244 /* sanity check */ 245 if (start < ex->ex_start || start + size > ex->ex_end) { 246 /* out of range: [start, size] should be contained in 247 * parent space 248 */ 249 return (0); 250 /* Should I invoke panic? */ 251 } 252 253 return (rbus_new_body(bt, ex, start, start + size, 254 RBUS_SPACE_SHARE)); 255} 256