Annotation of sys/dev/cardbus/rbus.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: rbus.c,v 1.10 2005/09/13 18:53:01 fgsch 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: * 3. All advertising materials mentioning features or use of this software
! 16: * must display the following acknowledgement:
! 17: * This product includes software developed by HAYAKAWA Koichi.
! 18: * 4. The name of the author may not be used to endorse or promote products
! 19: * derived from this software without specific prior written permission.
! 20: *
! 21: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
! 22: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
! 23: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
! 24: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
! 25: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
! 26: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
! 27: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
! 28: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
! 29: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
! 30: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
! 31: */
! 32:
! 33: #include <sys/param.h>
! 34: #include <sys/systm.h>
! 35: #include <sys/device.h>
! 36: #include <sys/malloc.h>
! 37: #include <sys/extent.h>
! 38:
! 39: #include <machine/bus.h>
! 40:
! 41: #include <dev/cardbus/rbus.h>
! 42:
! 43: /* #define RBUS_DEBUG */
! 44:
! 45: #if defined RBUS_DEBUG
! 46: #define STATIC
! 47: #define DPRINTF(a) printf a
! 48: #define DDELAY(x) delay((x)*1000*1000)
! 49: #else
! 50: #define STATIC static
! 51: #define DPRINTF(a)
! 52: #endif
! 53:
! 54:
! 55: static rbus_tag_t rbus_new_body(bus_space_tag_t, rbus_tag_t, struct extent *,
! 56: bus_addr_t, bus_addr_t, bus_addr_t, int);
! 57:
! 58: int
! 59: rbus_space_alloc(rbus_tag_t rbt, bus_addr_t addr, bus_size_t size,
! 60: bus_addr_t mask, bus_addr_t align, int flags, bus_addr_t *addrp,
! 61: bus_space_handle_t *bshp)
! 62: {
! 63: return (rbus_space_alloc_subregion(rbt, rbt->rb_start, rbt->rb_end,
! 64: addr, size, mask, align, flags, addrp, bshp));
! 65: }
! 66:
! 67: int
! 68: rbus_space_alloc_subregion(rbus_tag_t rbt, bus_addr_t substart,
! 69: bus_addr_t subend, bus_addr_t addr, bus_size_t size,
! 70: bus_addr_t mask, bus_addr_t align, int flags, bus_addr_t *addrp,
! 71: bus_space_handle_t *bshp)
! 72: {
! 73: bus_addr_t decodesize = mask + 1;
! 74: bus_addr_t boundary, search_addr;
! 75: int val;
! 76: u_long result;
! 77: int exflags = EX_FAST | EX_NOWAIT | EX_MALLOCOK;
! 78:
! 79: DPRINTF(("rbus_space_alloc: addr %lx, size %lx, mask %lx, align %lx\n",
! 80: (u_long)addr, (u_long)size, (u_long)mask, (u_long)align));
! 81:
! 82: addr += rbt->rb_offset;
! 83:
! 84: if (mask == 0) {
! 85: /* FULL Decode */
! 86: decodesize = 0;
! 87: }
! 88:
! 89: if (rbt->rb_flags == RBUS_SPACE_ASK_PARENT) {
! 90: return (rbus_space_alloc(rbt->rb_parent, addr, size, mask,
! 91: align, flags, addrp, bshp));
! 92: } else if (rbt->rb_flags == RBUS_SPACE_SHARE ||
! 93: rbt->rb_flags == RBUS_SPACE_DEDICATE) {
! 94: /* rbt has its own sh_extent */
! 95:
! 96: /* sanity check: the subregion [substart, subend] should be
! 97: smaller than the region included in sh_extent */
! 98: if (substart < rbt->rb_ext->ex_start ||
! 99: subend > rbt->rb_ext->ex_end) {
! 100: DPRINTF(("rbus: out of range\n"));
! 101: return (1);
! 102: }
! 103:
! 104: if (decodesize == align) {
! 105: if (extent_alloc_subregion(rbt->rb_ext, substart,
! 106: subend, size, align, 0, 0, exflags, &result))
! 107: return (1);
! 108: } else if (decodesize == 0) {
! 109: /* maybe, the register is overflowed. */
! 110:
! 111: if (extent_alloc_subregion(rbt->rb_ext, addr,
! 112: addr + size, size, 1, 0, 0, exflags, &result))
! 113: return (1);
! 114: } else {
! 115: boundary = decodesize > align ? decodesize : align;
! 116:
! 117: search_addr = (substart & ~(boundary - 1)) + addr;
! 118:
! 119: if (search_addr < substart)
! 120: search_addr += boundary;
! 121:
! 122: val = 1;
! 123: for (; search_addr + size <= subend;
! 124: search_addr += boundary) {
! 125: val = extent_alloc_subregion(
! 126: rbt->rb_ext,search_addr,
! 127: search_addr + size, size, align, 0, 0,
! 128: exflags, &result);
! 129: DPRINTF(("rbus: trying [%lx:%lx] %lx\n",
! 130: (u_long)search_addr,
! 131: (u_long)search_addr + size,
! 132: (u_long)align));
! 133: if (val == 0)
! 134: break;
! 135: }
! 136:
! 137: if (val != 0) {
! 138: /* no space found */
! 139: DPRINTF(("rbus: no space found\n"));
! 140: return (1);
! 141: }
! 142: }
! 143:
! 144: if (md_space_map(rbt->rb_bt, result, size, flags, bshp)) {
! 145: /* map failed */
! 146: extent_free(rbt->rb_ext, result, size, exflags);
! 147: return (1);
! 148: }
! 149:
! 150: if (addrp != NULL)
! 151: *addrp = result + rbt->rb_offset;
! 152: return (0);
! 153: } else {
! 154: /* error!! */
! 155: DPRINTF(("rbus: no rbus type\n"));
! 156: return (1);
! 157: }
! 158: }
! 159:
! 160: int
! 161: rbus_space_free(rbus_tag_t rbt, bus_space_handle_t bsh, bus_size_t size,
! 162: bus_addr_t *addrp)
! 163: {
! 164: int exflags = EX_FAST | EX_NOWAIT;
! 165: bus_addr_t addr;
! 166: int status = 1;
! 167:
! 168: if (rbt->rb_flags == RBUS_SPACE_ASK_PARENT) {
! 169: status = rbus_space_free(rbt->rb_parent, bsh, size, &addr);
! 170: } else if (rbt->rb_flags == RBUS_SPACE_SHARE ||
! 171: rbt->rb_flags == RBUS_SPACE_DEDICATE) {
! 172: md_space_unmap(rbt->rb_bt, bsh, size, &addr);
! 173:
! 174: extent_free(rbt->rb_ext, addr, size, exflags);
! 175:
! 176: status = 0;
! 177: } else {
! 178: /* error. INVALID rbustag */
! 179: status = 1;
! 180: }
! 181:
! 182: if (addrp != NULL)
! 183: *addrp = addr;
! 184:
! 185: return (status);
! 186: }
! 187:
! 188: /*
! 189: * static rbus_tag_t
! 190: * rbus_new_body(bus_space_tag_t bt, rbus_tag_t parent,
! 191: * struct extent *ex, bus_addr_t start, bus_size_t end,
! 192: * bus_addr_t offset, int flags)
! 193: *
! 194: */
! 195: static rbus_tag_t
! 196: rbus_new_body(bus_space_tag_t bt, rbus_tag_t parent, struct extent *ex,
! 197: bus_addr_t start, bus_addr_t end, bus_addr_t offset, int flags)
! 198: {
! 199: rbus_tag_t rb;
! 200:
! 201: /* sanity check */
! 202: if (parent != NULL) {
! 203: if (start < parent->rb_start || end > parent->rb_end) {
! 204: /* out of range: [start, size] should be contained
! 205: * in parent space
! 206: */
! 207: return (0);
! 208: /* Should I invoke panic? */
! 209: }
! 210: }
! 211:
! 212: if ((rb = (rbus_tag_t)malloc(sizeof(struct rbustag), M_DEVBUF,
! 213: M_NOWAIT)) == NULL) {
! 214: panic("no memory for rbus instance");
! 215: }
! 216:
! 217: rb->rb_bt = bt;
! 218: rb->rb_parent = parent;
! 219: rb->rb_start = start;
! 220: rb->rb_end = end;
! 221: rb->rb_offset = offset;
! 222: rb->rb_flags = flags;
! 223: rb->rb_ext = ex;
! 224:
! 225: DPRINTF(("rbus_new_body: [%lx, %lx] type %s name [%s]\n",
! 226: (u_long)start, (u_long)end,
! 227: flags == RBUS_SPACE_SHARE ? "share" :
! 228: flags == RBUS_SPACE_DEDICATE ? "dedicated" :
! 229: flags == RBUS_SPACE_ASK_PARENT ? "parent" : "invalid",
! 230: ex != NULL ? ex->ex_name : "noname"));
! 231:
! 232: return (rb);
! 233: }
! 234:
! 235: /*
! 236: * rbus_tag_t rbus_new(rbus_tag_t parent, bus_addr_t start, bus_size_t
! 237: * size, bus_addr_t offset, int flags)
! 238: *
! 239: * This function makes a new child rbus instance.
! 240: */
! 241: rbus_tag_t
! 242: rbus_new(rbus_tag_t parent, bus_addr_t start, bus_size_t size,
! 243: bus_addr_t offset, int flags)
! 244: {
! 245: rbus_tag_t rb;
! 246: struct extent *ex = NULL;
! 247: bus_addr_t end = start + size;
! 248:
! 249: if (flags == RBUS_SPACE_SHARE) {
! 250: ex = parent->rb_ext;
! 251: } else if (flags == RBUS_SPACE_DEDICATE) {
! 252: if ((ex = extent_create("rbus", start, end, M_DEVBUF, NULL, 0,
! 253: EX_NOCOALESCE|EX_NOWAIT)) == NULL)
! 254: return (NULL);
! 255: } else if (flags == RBUS_SPACE_ASK_PARENT) {
! 256: ex = NULL;
! 257: } else {
! 258: /* Invalid flag */
! 259: return (0);
! 260: }
! 261:
! 262: rb = rbus_new_body(parent->rb_bt, parent, ex, start, start + size,
! 263: offset, flags);
! 264:
! 265: if ((rb == NULL) && (flags == RBUS_SPACE_DEDICATE))
! 266: extent_destroy(ex);
! 267:
! 268: return (rb);
! 269: }
! 270:
! 271: /*
! 272: * rbus_tag_t rbus_new_root_delegate(bus_space_tag, bus_addr_t,
! 273: * bus_size_t, bus_addr_t offset)
! 274: *
! 275: * This function makes a root rbus instance.
! 276: */
! 277: rbus_tag_t
! 278: rbus_new_root_delegate(bus_space_tag_t bt, bus_addr_t start, bus_size_t size,
! 279: bus_addr_t offset)
! 280: {
! 281: rbus_tag_t rb;
! 282: struct extent *ex;
! 283:
! 284: if ((ex = extent_create("rbus root", start, start + size, M_DEVBUF,
! 285: NULL, 0, EX_NOCOALESCE|EX_NOWAIT)) == NULL)
! 286: return (NULL);
! 287:
! 288: rb = rbus_new_body(bt, NULL, ex, start, start + size, offset,
! 289: RBUS_SPACE_DEDICATE);
! 290:
! 291: if (rb == NULL)
! 292: extent_destroy(ex);
! 293:
! 294: return (rb);
! 295: }
! 296:
! 297: /*
! 298: * rbus_tag_t rbus_new_root_share(bus_space_tag, struct extent *,
! 299: * bus_addr_t, bus_size_t, bus_addr_t offset)
! 300: *
! 301: * This function makes a root rbus instance.
! 302: */
! 303: rbus_tag_t
! 304: rbus_new_root_share(bus_space_tag_t bt, struct extent *ex, bus_addr_t start,
! 305: bus_size_t size, bus_addr_t offset)
! 306: {
! 307: /* sanity check */
! 308: if (start < ex->ex_start || start + size > ex->ex_end) {
! 309: /* out of range: [start, size] should be contained in
! 310: * parent space
! 311: */
! 312: return (0);
! 313: /* Should I invoke panic? */
! 314: }
! 315:
! 316: return (rbus_new_body(bt, NULL, ex, start, start + size, offset,
! 317: RBUS_SPACE_SHARE));
! 318: }
! 319:
! 320: /*
! 321: * int rbus_delete (rbus_tag_t rb)
! 322: *
! 323: * This function deletes the rbus structure pointed in the argument.
! 324: */
! 325: int
! 326: rbus_delete(rbus_tag_t rb)
! 327: {
! 328: DPRINTF(("rbus_delete called [%s]\n", rb->rb_ext != NULL ?
! 329: rb->rb_ext->ex_name : "noname"));
! 330:
! 331: if (rb->rb_flags == RBUS_SPACE_DEDICATE)
! 332: extent_destroy(rb->rb_ext);
! 333:
! 334: free(rb, M_DEVBUF);
! 335:
! 336: return (0);
! 337: }
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