pci_map.c revision 1.6
1 /* $NetBSD: pci_map.c,v 1.6 2000/01/25 22:30:04 drochner Exp $ */ 2 3 /*- 4 * Copyright (c) 1998 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Charles M. Hannum. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 /* 40 * PCI device mapping. 41 */ 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/device.h> 46 47 #include <dev/pci/pcireg.h> 48 #include <dev/pci/pcivar.h> 49 50 static int pci_io_find __P((pci_chipset_tag_t, pcitag_t, int, pcireg_t, 51 bus_addr_t *, bus_size_t *, int *)); 52 static int pci_mem_find __P((pci_chipset_tag_t, pcitag_t, int, pcireg_t, 53 bus_addr_t *, bus_size_t *, int *)); 54 55 static int 56 pci_io_find(pc, tag, reg, type, basep, sizep, flagsp) 57 pci_chipset_tag_t pc; 58 pcitag_t tag; 59 int reg; 60 pcireg_t type; 61 bus_addr_t *basep; 62 bus_size_t *sizep; 63 int *flagsp; 64 { 65 pcireg_t address, mask; 66 int s; 67 68 if (reg < PCI_MAPREG_START || reg >= PCI_MAPREG_END || (reg & 3)) 69 panic("pci_io_find: bad request"); 70 71 /* 72 * Section 6.2.5.1, `Address Maps', tells us that: 73 * 74 * 1) The builtin software should have already mapped the device in a 75 * reasonable way. 76 * 77 * 2) A device which wants 2^n bytes of memory will hardwire the bottom 78 * n bits of the address to 0. As recommended, we write all 1s and see 79 * what we get back. 80 */ 81 s = splhigh(); 82 address = pci_conf_read(pc, tag, reg); 83 pci_conf_write(pc, tag, reg, 0xffffffff); 84 mask = pci_conf_read(pc, tag, reg); 85 pci_conf_write(pc, tag, reg, address); 86 splx(s); 87 88 if (PCI_MAPREG_TYPE(address) != PCI_MAPREG_TYPE_IO) { 89 printf("pci_io_find: expected type i/o, found mem\n"); 90 return (1); 91 } 92 93 if (PCI_MAPREG_IO_SIZE(mask) == 0) { 94 printf("pci_io_find: void region\n"); 95 return (1); 96 } 97 98 if (basep != 0) 99 *basep = PCI_MAPREG_IO_ADDR(address); 100 if (sizep != 0) 101 *sizep = PCI_MAPREG_IO_SIZE(mask); 102 if (flagsp != 0) 103 *flagsp = 0; 104 105 return (0); 106 } 107 108 static int 109 pci_mem_find(pc, tag, reg, type, basep, sizep, flagsp) 110 pci_chipset_tag_t pc; 111 pcitag_t tag; 112 int reg; 113 pcireg_t type; 114 bus_addr_t *basep; 115 bus_size_t *sizep; 116 int *flagsp; 117 { 118 pcireg_t address, mask; 119 int s; 120 121 if (reg < PCI_MAPREG_START || reg >= PCI_MAPREG_END || (reg & 3)) 122 panic("pci_find_mem: bad request"); 123 124 /* 125 * Section 6.2.5.1, `Address Maps', tells us that: 126 * 127 * 1) The builtin software should have already mapped the device in a 128 * reasonable way. 129 * 130 * 2) A device which wants 2^n bytes of memory will hardwire the bottom 131 * n bits of the address to 0. As recommended, we write all 1s and see 132 * what we get back. 133 */ 134 s = splhigh(); 135 address = pci_conf_read(pc, tag, reg); 136 pci_conf_write(pc, tag, reg, 0xffffffff); 137 mask = pci_conf_read(pc, tag, reg); 138 pci_conf_write(pc, tag, reg, address); 139 splx(s); 140 141 if (PCI_MAPREG_TYPE(address) != PCI_MAPREG_TYPE_MEM) { 142 printf("pci_mem_find: expected type mem, found i/o\n"); 143 return (1); 144 } 145 if (PCI_MAPREG_MEM_TYPE(address) != PCI_MAPREG_MEM_TYPE(type)) { 146 printf("pci_mem_find: expected mem type %08x, found %08x\n", 147 PCI_MAPREG_MEM_TYPE(type), 148 PCI_MAPREG_MEM_TYPE(address)); 149 return (1); 150 } 151 152 if (PCI_MAPREG_MEM_SIZE(mask) == 0) { 153 printf("pci_mem_find: void region\n"); 154 return (1); 155 } 156 157 switch (PCI_MAPREG_MEM_TYPE(address)) { 158 case PCI_MAPREG_MEM_TYPE_32BIT: 159 case PCI_MAPREG_MEM_TYPE_32BIT_1M: 160 break; 161 case PCI_MAPREG_MEM_TYPE_64BIT: 162 printf("pci_mem_find: 64-bit memory mapping register\n"); 163 return (1); 164 default: 165 printf("pci_mem_find: reserved mapping register type\n"); 166 return (1); 167 } 168 169 if (basep != 0) 170 *basep = PCI_MAPREG_MEM_ADDR(address); 171 if (sizep != 0) 172 *sizep = PCI_MAPREG_MEM_SIZE(mask); 173 if (flagsp != 0) 174 *flagsp = PCI_MAPREG_MEM_PREFETCHABLE(address) ? 175 BUS_SPACE_MAP_PREFETCHABLE : 0; 176 177 return (0); 178 } 179 180 int 181 pci_mapreg_info(pc, tag, reg, type, basep, sizep, flagsp) 182 pci_chipset_tag_t pc; 183 pcitag_t tag; 184 int reg; 185 pcireg_t type; 186 bus_addr_t *basep; 187 bus_size_t *sizep; 188 int *flagsp; 189 { 190 191 if (PCI_MAPREG_TYPE(type) == PCI_MAPREG_TYPE_IO) 192 return (pci_io_find(pc, tag, reg, type, basep, sizep, 193 flagsp)); 194 else 195 return (pci_mem_find(pc, tag, reg, type, basep, sizep, 196 flagsp)); 197 } 198 199 int 200 pci_mapreg_map(pa, reg, type, busflags, tagp, handlep, basep, sizep) 201 struct pci_attach_args *pa; 202 int reg, busflags; 203 pcireg_t type; 204 bus_space_tag_t *tagp; 205 bus_space_handle_t *handlep; 206 bus_addr_t *basep; 207 bus_size_t *sizep; 208 { 209 bus_space_tag_t tag; 210 bus_space_handle_t handle; 211 bus_addr_t base; 212 bus_size_t size; 213 int flags; 214 215 if (PCI_MAPREG_TYPE(type) == PCI_MAPREG_TYPE_IO) { 216 if ((pa->pa_flags & PCI_FLAGS_IO_ENABLED) == 0) 217 return (1); 218 if (pci_io_find(pa->pa_pc, pa->pa_tag, reg, type, &base, 219 &size, &flags)) 220 return (1); 221 tag = pa->pa_iot; 222 } else { 223 if ((pa->pa_flags & PCI_FLAGS_MEM_ENABLED) == 0) 224 return (1); 225 if (pci_mem_find(pa->pa_pc, pa->pa_tag, reg, type, &base, 226 &size, &flags)) 227 return (1); 228 tag = pa->pa_memt; 229 } 230 231 if (bus_space_map(tag, base, size, busflags | flags, &handle)) 232 return (1); 233 234 if (tagp != 0) 235 *tagp = tag; 236 if (handlep != 0) 237 *handlep = handle; 238 if (basep != 0) 239 *basep = base; 240 if (sizep != 0) 241 *sizep = size; 242 243 return (0); 244 } 245
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