1 /* $NetBSD: rbus_machdep.c,v 1.27 2017/08/15 09:25:00 maxv Exp $ */ 2 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/cdefs.h> 29 __KERNEL_RCSID(0, "$NetBSD: rbus_machdep.c,v 1.27 2017/08/15 09:25:00 maxv Exp $"); 30 31 #include "opt_pcibios.h" 32 #include "opt_pcifixup.h" 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/extent.h> 37 38 #include <sys/sysctl.h> 39 40 #include <sys/bus.h> 41 #include <dev/cardbus/rbus.h> 42 43 #include <sys/device.h> 44 #include <dev/isa/isareg.h> 45 #include <dev/isa/isavar.h> 46 47 #include <dev/pci/pcivar.h> 48 #if defined(PCI_ADDR_FIXUP) 49 #include <arch/x86/pci/pci_addr_fixup.h> 50 #endif 51 52 #ifndef RBUS_IO_BASE 53 #define RBUS_IO_BASE 0x4000 54 #endif 55 #ifndef RBUS_IO_SIZE 56 #define RBUS_IO_SIZE 0x2000 57 #endif 58 59 #ifndef RBUS_MIN_START 60 #define RBUS_MIN_START 0x40000000 /* 1GB */ 61 #else 62 /* 63 * Note that kernel config forced RBUS_MIN_START. 64 */ 65 #define RBUS_MIN_START_FORCED 66 #endif 67 bus_addr_t rbus_min_start = RBUS_MIN_START; 68 69 /* 70 * Dynamically set the start address for rbus. This must be called 71 * before rbus is initialized. The start address should be determined 72 * by the amount of installed memory. Generally 1 GB has been found 73 * to be a good value, but it fails on some Thinkpads (e.g. 2645-4AU), 74 * for which 0.5 GB is a good value. It also fails on (at least) 75 * Thinkpads with 2GB of RAM, for which 2 GB is a good value. 76 * 77 * Thus, a general strategy of setting rbus_min_start to the amount of 78 * memory seems in order. However, the actually amount of memory is 79 * generally slightly more than the amount found, e.g. 1014MB vs 1024, 80 * or 2046 vs 2048. 81 */ 82 void 83 rbus_min_start_hint(psize_t ram) 84 { 85 #ifdef RBUS_MIN_START_FORCED 86 aprint_debug("rbus: rbus_min_start from config at %#0" PRIxPADDR "\n", 87 rbus_min_start); 88 #else 89 if (ram <= 192*1024*1024UL) { 90 /* 91 * <= 192 MB, so try 0.5 GB. This will work on 92 * Thinkpad 600E (2645-4AU), which fails at 1GB, and 93 * on some other older machines that may have trouble 94 * with addresses needing more than 20 bits. 95 */ 96 rbus_min_start = 512 * 1024 * 1024UL; 97 } 98 99 if (ram >= 1024*1024*1024UL) { 100 /* 101 * > 1GB, so try 2 GB. 102 */ 103 rbus_min_start = 2 * 1024 * 1024 * 1024UL; 104 } 105 106 /* XXX Not tested in > 2 GB case. */ 107 if (ram > 2 * 1024*1024*1024UL) { 108 /* 109 * > 2 GB, so try 3 GB. 110 */ 111 rbus_min_start = 3 * 1024 * 1024 * 1024UL; 112 } 113 114 aprint_debug("rbus: rbus_min_start set to %#0" PRIxPADDR "\n", 115 rbus_min_start); 116 #endif 117 } 118 119 120 /* 121 * rbus_tag_t rbus_fakeparent_mem(struct pci_attach_args *pa) 122 * 123 * This function makes an rbus tag for memory space. This rbus tag 124 * shares the all memory region of ex_iomem. 125 */ 126 rbus_tag_t 127 rbus_pccbb_parent_mem(struct pci_attach_args *pa) 128 { 129 bus_addr_t start; 130 bus_size_t size; 131 extern struct extent *iomem_ex; 132 struct extent *ex = iomem_ex; 133 134 #if defined(PCI_ADDR_FIXUP) 135 if (pciaddr.extent_mem != NULL) 136 ex = pciaddr.extent_mem; 137 #endif 138 139 start = ex->ex_start; 140 141 /* 142 * XXX: unfortunately, iomem_ex cannot be used for the dynamic 143 * bus_space allocation. There are some hidden memory (or 144 * some obstacles which are not recognised by the kernel) in 145 * the region governed by iomem_ex. So I decide to use only 146 * very high address region. 147 * 148 * If pcibios_addr_fixup() succeeded, the PCI device is using an area 149 * which is not recognised by the kernel as already reserved. 150 */ 151 152 if (start < rbus_min_start) 153 start = rbus_min_start; 154 155 size = ex->ex_end - start; 156 157 return rbus_new_root_share(pa->pa_memt, ex, start, size, 0); 158 } 159 160 161 /* 162 * rbus_tag_t rbus_pccbb_parent_io(struct pci_attach_args *pa) 163 */ 164 rbus_tag_t 165 rbus_pccbb_parent_io(struct pci_attach_args *pa) 166 { 167 bus_addr_t start; 168 bus_size_t size; 169 rbus_tag_t ret; 170 extern struct extent *ioport_ex; 171 struct extent *ex = ioport_ex; 172 173 #if defined(PCI_ADDR_FIXUP) 174 if (pciaddr.extent_port != NULL) 175 ex = pciaddr.extent_port; 176 #endif 177 178 start = RBUS_IO_BASE; 179 size = RBUS_IO_SIZE; 180 181 ret = rbus_new_root_share(pa->pa_iot, ex, start, size, 0); 182 if (ret == NULL) 183 panic("failed to alloc I/O space"); 184 185 return ret; 186 } 187
Indexes created Sat Sep 20 22:09:52 GMT 2025