pci_map.c revision 1.13
1 /* $NetBSD: pci_map.c,v 1.13 2005/02/27 00:27:33 perry Exp $ */ 2 3 /*- 4 * Copyright (c) 1998, 2000 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; by William R. Studenmund; by Jason R. Thorpe. 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/cdefs.h> 44 __KERNEL_RCSID(0, "$NetBSD: pci_map.c,v 1.13 2005/02/27 00:27:33 perry Exp $"); 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/device.h> 49 50 #include <dev/pci/pcireg.h> 51 #include <dev/pci/pcivar.h> 52 53 static int 54 pci_io_find(pci_chipset_tag_t pc, pcitag_t tag, int reg, pcireg_t type, 55 bus_addr_t *basep, bus_size_t *sizep, int *flagsp) 56 { 57 pcireg_t address, mask; 58 int s; 59 60 if (reg < PCI_MAPREG_START || 61 #if 0 62 /* 63 * Can't do this check; some devices have mapping registers 64 * way out in left field. 65 */ 66 reg >= PCI_MAPREG_END || 67 #endif 68 (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(pci_chipset_tag_t pc, pcitag_t tag, int reg, pcireg_t type, 110 bus_addr_t *basep, bus_size_t *sizep, int *flagsp) 111 { 112 pcireg_t address, mask, address1 = 0, mask1 = 0xffffffff; 113 u_int64_t waddress, wmask; 114 int s, is64bit; 115 116 is64bit = (PCI_MAPREG_MEM_TYPE(type) == PCI_MAPREG_MEM_TYPE_64BIT); 117 118 if (reg < PCI_MAPREG_START || 119 #if 0 120 /* 121 * Can't do this check; some devices have mapping registers 122 * way out in left field. 123 */ 124 reg >= PCI_MAPREG_END || 125 #endif 126 (reg & 3)) 127 panic("pci_mem_find: bad request"); 128 129 if (is64bit && (reg + 4) >= PCI_MAPREG_END) 130 panic("pci_mem_find: bad 64-bit request"); 131 132 /* 133 * Section 6.2.5.1, `Address Maps', tells us that: 134 * 135 * 1) The builtin software should have already mapped the device in a 136 * reasonable way. 137 * 138 * 2) A device which wants 2^n bytes of memory will hardwire the bottom 139 * n bits of the address to 0. As recommended, we write all 1s and see 140 * what we get back. 141 */ 142 s = splhigh(); 143 address = pci_conf_read(pc, tag, reg); 144 pci_conf_write(pc, tag, reg, 0xffffffff); 145 mask = pci_conf_read(pc, tag, reg); 146 pci_conf_write(pc, tag, reg, address); 147 if (is64bit) { 148 address1 = pci_conf_read(pc, tag, reg + 4); 149 pci_conf_write(pc, tag, reg + 4, 0xffffffff); 150 mask1 = pci_conf_read(pc, tag, reg + 4); 151 pci_conf_write(pc, tag, reg + 4, address1); 152 } 153 splx(s); 154 155 if (PCI_MAPREG_TYPE(address) != PCI_MAPREG_TYPE_MEM) { 156 printf("pci_mem_find: expected type mem, found i/o\n"); 157 return (1); 158 } 159 if (PCI_MAPREG_MEM_TYPE(address) != PCI_MAPREG_MEM_TYPE(type)) { 160 printf("pci_mem_find: expected mem type %08x, found %08x\n", 161 PCI_MAPREG_MEM_TYPE(type), 162 PCI_MAPREG_MEM_TYPE(address)); 163 return (1); 164 } 165 166 waddress = (u_int64_t)address1 << 32UL | address; 167 wmask = (u_int64_t)mask1 << 32UL | mask; 168 169 if ((is64bit && PCI_MAPREG_MEM64_SIZE(wmask) == 0) || 170 (!is64bit && PCI_MAPREG_MEM_SIZE(mask) == 0)) { 171 printf("pci_mem_find: void region\n"); 172 return (1); 173 } 174 175 switch (PCI_MAPREG_MEM_TYPE(address)) { 176 case PCI_MAPREG_MEM_TYPE_32BIT: 177 case PCI_MAPREG_MEM_TYPE_32BIT_1M: 178 break; 179 case PCI_MAPREG_MEM_TYPE_64BIT: 180 /* 181 * Handle the case of a 64-bit memory register on a 182 * platform with 32-bit addressing. Make sure that 183 * the address assigned and the device's memory size 184 * fit in 32 bits. We implicitly assume that if 185 * bus_addr_t is 64-bit, then so is bus_size_t. 186 */ 187 if (sizeof(u_int64_t) > sizeof(bus_addr_t) && 188 (address1 != 0 || mask1 != 0xffffffff)) { 189 printf("pci_mem_find: 64-bit memory map which is " 190 "inaccessible on a 32-bit platform\n"); 191 return (1); 192 } 193 break; 194 default: 195 printf("pci_mem_find: reserved mapping register type\n"); 196 return (1); 197 } 198 199 if (sizeof(u_int64_t) > sizeof(bus_addr_t)) { 200 if (basep != 0) 201 *basep = PCI_MAPREG_MEM_ADDR(address); 202 if (sizep != 0) 203 *sizep = PCI_MAPREG_MEM_SIZE(mask); 204 } else { 205 if (basep != 0) 206 *basep = PCI_MAPREG_MEM64_ADDR(waddress); 207 if (sizep != 0) 208 *sizep = PCI_MAPREG_MEM64_SIZE(wmask); 209 } 210 if (flagsp != 0) 211 *flagsp = PCI_MAPREG_MEM_PREFETCHABLE(address) ? 212 BUS_SPACE_MAP_PREFETCHABLE : 0; 213 214 return (0); 215 } 216 217 #define _PCI_MAPREG_TYPEBITS(reg) \ 218 (PCI_MAPREG_TYPE(reg) == PCI_MAPREG_TYPE_IO ? \ 219 reg & PCI_MAPREG_TYPE_MASK : \ 220 reg & (PCI_MAPREG_TYPE_MASK|PCI_MAPREG_MEM_TYPE_MASK)) 221 222 pcireg_t 223 pci_mapreg_type(pci_chipset_tag_t pc, pcitag_t tag, int reg) 224 { 225 226 return (_PCI_MAPREG_TYPEBITS(pci_conf_read(pc, tag, reg))); 227 } 228 229 int 230 pci_mapreg_probe(pci_chipset_tag_t pc, pcitag_t tag, int reg, pcireg_t *typep) 231 { 232 pcireg_t address, mask; 233 int s; 234 235 s = splhigh(); 236 address = pci_conf_read(pc, tag, reg); 237 pci_conf_write(pc, tag, reg, 0xffffffff); 238 mask = pci_conf_read(pc, tag, reg); 239 pci_conf_write(pc, tag, reg, address); 240 splx(s); 241 242 if (mask == 0) /* unimplemented mapping register */ 243 return (0); 244 245 if (typep) 246 *typep = _PCI_MAPREG_TYPEBITS(address); 247 return (1); 248 } 249 250 int 251 pci_mapreg_info(pci_chipset_tag_t pc, pcitag_t tag, int reg, pcireg_t type, 252 bus_addr_t *basep, bus_size_t *sizep, int *flagsp) 253 { 254 255 if (PCI_MAPREG_TYPE(type) == PCI_MAPREG_TYPE_IO) 256 return (pci_io_find(pc, tag, reg, type, basep, sizep, 257 flagsp)); 258 else 259 return (pci_mem_find(pc, tag, reg, type, basep, sizep, 260 flagsp)); 261 } 262 263 int 264 pci_mapreg_map(struct pci_attach_args *pa, int reg, pcireg_t type, 265 int busflags, bus_space_tag_t *tagp, bus_space_handle_t *handlep, 266 bus_addr_t *basep, bus_size_t *sizep) 267 { 268 bus_space_tag_t tag; 269 bus_space_handle_t handle; 270 bus_addr_t base; 271 bus_size_t size; 272 int flags; 273 274 if (PCI_MAPREG_TYPE(type) == PCI_MAPREG_TYPE_IO) { 275 if ((pa->pa_flags & PCI_FLAGS_IO_ENABLED) == 0) 276 return (1); 277 if (pci_io_find(pa->pa_pc, pa->pa_tag, reg, type, &base, 278 &size, &flags)) 279 return (1); 280 tag = pa->pa_iot; 281 } else { 282 if ((pa->pa_flags & PCI_FLAGS_MEM_ENABLED) == 0) 283 return (1); 284 if (pci_mem_find(pa->pa_pc, pa->pa_tag, reg, type, &base, 285 &size, &flags)) 286 return (1); 287 tag = pa->pa_memt; 288 } 289 290 if (bus_space_map(tag, base, size, busflags | flags, &handle)) 291 return (1); 292 293 if (tagp != 0) 294 *tagp = tag; 295 if (handlep != 0) 296 *handlep = handle; 297 if (basep != 0) 298 *basep = base; 299 if (sizep != 0) 300 *sizep = size; 301 302 return (0); 303 } 304
Indexes created Wed Sep 24 05:09:52 GMT 2025