pci_map.c revision 1.1
1 /* $NetBSD: pci_map.c,v 1.1 1997/08/30 06:46:58 mycroft Exp $ */ 2 3 /* 4 * Copyright (c) 1994, 1997 Charles M. Hannum. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following 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 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by Charles M. Hannum. 17 * 4. The name of the author may not be used to endorse or promote products 18 * derived from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * PCI device mapping. 34 */ 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/device.h> 39 40 #include <dev/pci/pcireg.h> 41 #include <dev/pci/pcivar.h> 42 43 static int pci_io_find __P((pci_chipset_tag_t, pcitag_t, int, pcireg_t, 44 bus_addr_t *, bus_size_t *, int *)); 45 static int pci_mem_find __P((pci_chipset_tag_t, pcitag_t, int, pcireg_t, 46 bus_addr_t *, bus_size_t *, int *)); 47 48 static int 49 pci_io_find(pc, tag, reg, type, basep, sizep, flagsp) 50 pci_chipset_tag_t pc; 51 pcitag_t tag; 52 int reg; 53 pcireg_t type; 54 bus_addr_t *basep; 55 bus_size_t *sizep; 56 int *flagsp; 57 { 58 pcireg_t address, mask; 59 int s; 60 61 if (reg < PCI_MAPREG_START || reg >= PCI_MAPREG_END || (reg & 3)) 62 panic("pci_io_find: bad request"); 63 64 /* 65 * Section 6.2.5.1, `Address Maps', tells us that: 66 * 67 * 1) The builtin software should have already mapped the device in a 68 * reasonable way. 69 * 70 * 2) A device which wants 2^n bytes of memory will hardwire the bottom 71 * n bits of the address to 0. As recommended, we write all 1s and see 72 * what we get back. 73 */ 74 s = splhigh(); 75 address = pci_conf_read(pc, tag, reg); 76 pci_conf_write(pc, tag, reg, 0xffffffff); 77 mask = pci_conf_read(pc, tag, reg); 78 pci_conf_write(pc, tag, reg, address); 79 splx(s); 80 81 if (PCI_MAPREG_TYPE(address) != PCI_MAPREG_TYPE_IO) { 82 printf("pci_io_find: expected type i/o, found mem\n"); 83 return (1); 84 } 85 86 if (basep != 0) 87 *basep = PCI_MAPREG_IO_ADDR(address); 88 if (sizep != 0) 89 *sizep = PCI_MAPREG_IO_SIZE(mask); 90 if (flagsp != 0) 91 *flagsp = 0; 92 93 return (0); 94 } 95 96 static int 97 pci_mem_find(pc, tag, reg, type, basep, sizep, flagsp) 98 pci_chipset_tag_t pc; 99 pcitag_t tag; 100 int reg; 101 pcireg_t type; 102 bus_addr_t *basep; 103 bus_size_t *sizep; 104 int *flagsp; 105 { 106 pcireg_t address, mask; 107 int s; 108 109 if (reg < PCI_MAPREG_START || reg >= PCI_MAPREG_END || (reg & 3)) 110 panic("pci_find_mem: bad request"); 111 112 /* 113 * Section 6.2.5.1, `Address Maps', tells us that: 114 * 115 * 1) The builtin software should have already mapped the device in a 116 * reasonable way. 117 * 118 * 2) A device which wants 2^n bytes of memory will hardwire the bottom 119 * n bits of the address to 0. As recommended, we write all 1s and see 120 * what we get back. 121 */ 122 s = splhigh(); 123 address = pci_conf_read(pc, tag, reg); 124 pci_conf_write(pc, tag, reg, 0xffffffff); 125 mask = pci_conf_read(pc, tag, reg); 126 pci_conf_write(pc, tag, reg, address); 127 splx(s); 128 129 if (PCI_MAPREG_TYPE(address) != PCI_MAPREG_TYPE_MEM) { 130 printf("pci_mem_find: expected type mem, found i/o\n"); 131 return (1); 132 } 133 if (PCI_MAPREG_MEM_TYPE(address) != PCI_MAPREG_MEM_TYPE(type)) { 134 printf("pci_mem_find: expected mem type %08x, found %08x\n", 135 PCI_MAPREG_MEM_TYPE(type), 136 PCI_MAPREG_MEM_TYPE(address)); 137 return (1); 138 } 139 140 switch (PCI_MAPREG_MEM_TYPE(address)) { 141 case PCI_MAPREG_MEM_TYPE_32BIT: 142 case PCI_MAPREG_MEM_TYPE_32BIT_1M: 143 break; 144 case PCI_MAPREG_MEM_TYPE_64BIT: 145 printf("pci_mem_find: 64-bit memory mapping register\n"); 146 return (1); 147 default: 148 printf("pci_mem_find: reserved mapping register type\n"); 149 return (1); 150 } 151 152 if (basep != 0) 153 *basep = PCI_MAPREG_MEM_ADDR(address); 154 if (sizep != 0) 155 *sizep = PCI_MAPREG_MEM_SIZE(mask); 156 if (flagsp != 0) 157 *flagsp = PCI_MAPREG_MEM_CACHEABLE(address) ? 158 BUS_SPACE_MAP_CACHEABLE : 0; 159 160 return (0); 161 } 162 163 int 164 pci_mapreg_info(pc, tag, reg, type, basep, sizep, flagsp) 165 pci_chipset_tag_t pc; 166 pcitag_t tag; 167 int reg; 168 pcireg_t type; 169 bus_addr_t *basep; 170 bus_size_t *sizep; 171 int *flagsp; 172 { 173 174 if (PCI_MAPREG_TYPE(type) == PCI_MAPREG_TYPE_IO) 175 return (pci_io_find(pc, tag, reg, type, basep, sizep, 176 flagsp)); 177 else 178 return (pci_mem_find(pc, tag, reg, type, basep, sizep, 179 flagsp)); 180 } 181 182 int 183 pci_mapreg_map(pa, reg, type, busflags, tagp, handlep, basep, sizep) 184 struct pci_attach_args *pa; 185 int reg, busflags; 186 pcireg_t type; 187 bus_space_tag_t *tagp; 188 bus_space_handle_t *handlep; 189 bus_addr_t *basep; 190 bus_size_t *sizep; 191 { 192 bus_space_tag_t tag; 193 bus_space_handle_t handle; 194 bus_addr_t base; 195 bus_size_t size; 196 int flags; 197 198 if (PCI_MAPREG_TYPE(type) == PCI_MAPREG_TYPE_IO) { 199 if ((pa->pa_flags & PCI_FLAGS_IO_ENABLED) == 0) 200 return (1); 201 if (pci_io_find(pa->pa_pc, pa->pa_tag, reg, type, &base, 202 &size, &flags)) 203 return (1); 204 tag = pa->pa_iot; 205 } else { 206 if ((pa->pa_flags & PCI_FLAGS_MEM_ENABLED) == 0) 207 return (1); 208 if (pci_mem_find(pa->pa_pc, pa->pa_tag, reg, type, &base, 209 &size, &flags)) 210 return (1); 211 tag = pa->pa_memt; 212 } 213 214 if (bus_space_map(tag, base, size, busflags | flags, &handle)) 215 return (1); 216 217 if (tagp != 0) 218 *tagp = tag; 219 if (handlep != 0) 220 *handlep = handle; 221 if (basep != 0) 222 *basep = base; 223 if (sizep != 0) 224 *sizep = size; 225 226 return (0); 227 } 228
Indexes created Tue Sep 23 02:09:52 GMT 2025