1 /*- 2 * Copyright (c) 2005 by Marius Strobl <marius@FreeBSD.org> 3 * Copyright (c) 2015 Ian Lepore <ian@freebsd.org> 4 * 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 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 * 27 * The initial ofw_reg_to_paddr() implementation has been copied from powerpc 28 * ofw_machdep.c OF_decode_addr(). It was added by Marcel Moolenaar, who did not 29 * assert copyright with the addition but still deserves credit for the work. 30 * The powerpc OF_decode_addr() in turn was based on the sparc64 counterpart 31 * written by Marius Strobl. 32 */ 33 34 #include <sys/cdefs.h> 35 __FBSDID("$FreeBSD$"); 36 37 #include <sys/param.h> 38 #include <sys/boot.h> 39 #include <sys/bus.h> 40 #include <sys/libkern.h> 41 #include <sys/reboot.h> 42 #include <sys/rman.h> 43 44 #include <machine/bus.h> 45 46 #include <dev/ofw/openfirm.h> 47 #include <dev/ofw/ofw_pci.h> 48 #include <dev/ofw/ofw_subr.h> 49 50 static void 51 get_addr_props(phandle_t node, uint32_t *addrp, uint32_t *sizep, int *pcip) 52 { 53 char type[64]; 54 uint32_t addr, size; 55 int pci, res; 56 57 res = OF_getencprop(node, "#address-cells", &addr, sizeof(addr)); 58 if (res == -1) 59 addr = 2; 60 res = OF_getencprop(node, "#size-cells", &size, sizeof(size)); 61 if (res == -1) 62 size = 1; 63 pci = 0; 64 if (addr == 3 && size == 2) { 65 res = OF_getprop(node, "device_type", type, sizeof(type)); 66 if (res != -1) { 67 type[sizeof(type) - 1] = '\0'; 68 if (strcmp(type, "pci") == 0 || 69 strcmp(type, "pciex")== 0) 70 pci = 1; 71 } 72 } 73 if (addrp != NULL) 74 *addrp = addr; 75 if (sizep != NULL) 76 *sizep = size; 77 if (pcip != NULL) 78 *pcip = pci; 79 } 80 81 int 82 ofw_reg_to_paddr(phandle_t dev, int regno, bus_addr_t *paddr, 83 bus_size_t *psize, pcell_t *ppci_hi) 84 { 85 static pcell_t cell[256]; 86 pcell_t pci_hi; 87 uint64_t addr, raddr, baddr; 88 uint64_t size, rsize; 89 uint32_t c, nbridge, naddr, nsize; 90 phandle_t bridge, parent; 91 u_int spc, rspc; 92 int pci, pcib, res; 93 94 /* Sanity checking. */ 95 if (dev == 0) 96 return (EINVAL); 97 bridge = OF_parent(dev); 98 if (bridge == 0) 99 return (EINVAL); 100 if (regno < 0) 101 return (EINVAL); 102 if (paddr == NULL || psize == NULL) 103 return (EINVAL); 104 105 get_addr_props(bridge, &naddr, &nsize, &pci); 106 res = OF_getencprop(dev, (pci) ? "assigned-addresses" : "reg", 107 cell, sizeof(cell)); 108 if (res == -1) 109 return (ENXIO); 110 if (res % sizeof(cell[0])) 111 return (ENXIO); 112 res /= sizeof(cell[0]); 113 regno *= naddr + nsize; 114 if (regno + naddr + nsize > res) 115 return (EINVAL); 116 pci_hi = pci ? cell[regno] : OFW_PADDR_NOT_PCI; 117 spc = pci_hi & OFW_PCI_PHYS_HI_SPACEMASK; 118 addr = 0; 119 for (c = 0; c < naddr; c++) 120 addr = ((uint64_t)addr << 32) | cell[regno++]; 121 size = 0; 122 for (c = 0; c < nsize; c++) 123 size = ((uint64_t)size << 32) | cell[regno++]; 124 /* 125 * Map the address range in the bridge's decoding window as given 126 * by the "ranges" property. If a node doesn't have such property 127 * or the property is empty, we assume an identity mapping. The 128 * standard says a missing property indicates no possible mapping. 129 * This code is more liberal since the intended use is to get a 130 * console running early, and a printf to warn of malformed data 131 * is probably futile before the console is fully set up. 132 */ 133 parent = OF_parent(bridge); 134 while (parent != 0) { 135 get_addr_props(parent, &nbridge, NULL, &pcib); 136 res = OF_getencprop(bridge, "ranges", cell, sizeof(cell)); 137 if (res < 1) 138 goto next; 139 if (res % sizeof(cell[0])) 140 return (ENXIO); 141 /* Capture pci_hi if we just transitioned onto a PCI bus. */ 142 if (pcib && pci_hi == OFW_PADDR_NOT_PCI) { 143 pci_hi = cell[0]; 144 spc = pci_hi & OFW_PCI_PHYS_HI_SPACEMASK; 145 } 146 res /= sizeof(cell[0]); 147 regno = 0; 148 while (regno < res) { 149 rspc = (pci ? cell[regno] : OFW_PADDR_NOT_PCI) & 150 OFW_PCI_PHYS_HI_SPACEMASK; 151 if (rspc != spc) { 152 regno += naddr + nbridge + nsize; 153 continue; 154 } 155 raddr = 0; 156 for (c = 0; c < naddr; c++) 157 raddr = ((uint64_t)raddr << 32) | cell[regno++]; 158 rspc = (pcib) 159 ? cell[regno] & OFW_PCI_PHYS_HI_SPACEMASK 160 : OFW_PADDR_NOT_PCI; 161 baddr = 0; 162 for (c = 0; c < nbridge; c++) 163 baddr = ((uint64_t)baddr << 32) | cell[regno++]; 164 rsize = 0; 165 for (c = 0; c < nsize; c++) 166 rsize = ((uint64_t)rsize << 32) | cell[regno++]; 167 if (addr < raddr || addr >= raddr + rsize) 168 continue; 169 addr = addr - raddr + baddr; 170 if (rspc != OFW_PADDR_NOT_PCI) 171 spc = rspc; 172 } 173 next: 174 bridge = parent; 175 parent = OF_parent(bridge); 176 get_addr_props(bridge, &naddr, &nsize, &pci); 177 } 178 179 KASSERT(addr <= BUS_SPACE_MAXADDR, 180 ("Bus address is too large: %jx", (uintmax_t)addr)); 181 KASSERT(size <= BUS_SPACE_MAXSIZE, 182 ("Bus size is too large: %jx", (uintmax_t)size)); 183 184 *paddr = addr; 185 *psize = size; 186 if (ppci_hi != NULL) 187 *ppci_hi = pci_hi; 188 189 return (0); 190 } 191 192 /* 193 * This is intended to be called early on, right after the OF system is 194 * initialized, so pmap may not be up yet. 195 */ 196 int 197 ofw_parse_bootargs(void) 198 { 199 phandle_t chosen; 200 char buf[2048]; /* early stack supposedly big enough */ 201 int err; 202 203 chosen = OF_finddevice("/chosen"); 204 if (chosen == -1) 205 return (chosen); 206 207 if ((err = OF_getprop(chosen, "bootargs", buf, sizeof(buf))) != -1) { 208 boothowto |= boot_parse_cmdline(buf); 209 return (0); 210 } 211 212 return (err); 213 } 214