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 #include <sys/param.h> 36 #include <sys/boot.h> 37 #include <sys/bus.h> 38 #include <sys/libkern.h> 39 #include <sys/reboot.h> 40 #include <sys/rman.h> 41 42 #include <machine/bus.h> 43 44 #include <dev/ofw/openfirm.h> 45 #include <dev/ofw/ofw_pci.h> 46 #include <dev/ofw/ofw_subr.h> 47 48 static void 49 get_addr_props(phandle_t node, uint32_t *addrp, uint32_t *sizep, int *pcip) 50 { 51 char type[64]; 52 uint32_t addr, size; 53 int pci, res; 54 55 res = OF_getencprop(node, "#address-cells", &addr, sizeof(addr)); 56 if (res == -1) 57 addr = 2; 58 res = OF_getencprop(node, "#size-cells", &size, sizeof(size)); 59 if (res == -1) 60 size = 1; 61 pci = 0; 62 if (addr == 3 && size == 2) { 63 res = OF_getprop(node, "device_type", type, sizeof(type)); 64 if (res != -1) { 65 type[sizeof(type) - 1] = '\0'; 66 if (strcmp(type, "pci") == 0 || 67 strcmp(type, "pciex")== 0) 68 pci = 1; 69 } 70 } 71 if (addrp != NULL) 72 *addrp = addr; 73 if (sizep != NULL) 74 *sizep = size; 75 if (pcip != NULL) 76 *pcip = pci; 77 } 78 79 int 80 ofw_reg_to_paddr(phandle_t dev, int regno, bus_addr_t *paddr, 81 bus_size_t *psize, pcell_t *ppci_hi) 82 { 83 static pcell_t cell[256]; 84 pcell_t pci_hi; 85 uint64_t addr, raddr, baddr; 86 uint64_t size, rsize; 87 uint32_t c, nbridge, naddr, nsize; 88 phandle_t bridge, parent; 89 u_int spc, rspc; 90 int pci, pcib, res; 91 92 /* Sanity checking. */ 93 if (dev == 0) 94 return (EINVAL); 95 bridge = OF_parent(dev); 96 if (bridge == 0) 97 return (EINVAL); 98 if (regno < 0) 99 return (EINVAL); 100 if (paddr == NULL || psize == NULL) 101 return (EINVAL); 102 103 get_addr_props(bridge, &naddr, &nsize, &pci); 104 res = OF_getencprop(dev, (pci) ? "assigned-addresses" : "reg", 105 cell, sizeof(cell)); 106 if (res == -1) 107 return (ENXIO); 108 if (res % sizeof(cell[0])) 109 return (ENXIO); 110 res /= sizeof(cell[0]); 111 regno *= naddr + nsize; 112 if (regno + naddr + nsize > res) 113 return (EINVAL); 114 pci_hi = pci ? cell[regno] : OFW_PADDR_NOT_PCI; 115 spc = pci_hi & OFW_PCI_PHYS_HI_SPACEMASK; 116 addr = 0; 117 for (c = 0; c < naddr; c++) 118 addr = ((uint64_t)addr << 32) | cell[regno++]; 119 size = 0; 120 for (c = 0; c < nsize; c++) 121 size = ((uint64_t)size << 32) | cell[regno++]; 122 /* 123 * Map the address range in the bridge's decoding window as given 124 * by the "ranges" property. If a node doesn't have such property 125 * or the property is empty, we assume an identity mapping. The 126 * standard says a missing property indicates no possible mapping. 127 * This code is more liberal since the intended use is to get a 128 * console running early, and a printf to warn of malformed data 129 * is probably futile before the console is fully set up. 130 */ 131 parent = OF_parent(bridge); 132 while (parent != 0) { 133 get_addr_props(parent, &nbridge, NULL, &pcib); 134 res = OF_getencprop(bridge, "ranges", cell, sizeof(cell)); 135 if (res < 1) 136 goto next; 137 if (res % sizeof(cell[0])) 138 return (ENXIO); 139 /* Capture pci_hi if we just transitioned onto a PCI bus. */ 140 if (pcib && pci_hi == OFW_PADDR_NOT_PCI) { 141 pci_hi = cell[0]; 142 spc = pci_hi & OFW_PCI_PHYS_HI_SPACEMASK; 143 } 144 res /= sizeof(cell[0]); 145 regno = 0; 146 while (regno < res) { 147 rspc = (pci ? cell[regno] : OFW_PADDR_NOT_PCI) & 148 OFW_PCI_PHYS_HI_SPACEMASK; 149 if (rspc != spc) { 150 regno += naddr + nbridge + nsize; 151 continue; 152 } 153 raddr = 0; 154 for (c = 0; c < naddr; c++) 155 raddr = ((uint64_t)raddr << 32) | cell[regno++]; 156 rspc = (pcib) 157 ? cell[regno] & OFW_PCI_PHYS_HI_SPACEMASK 158 : OFW_PADDR_NOT_PCI; 159 baddr = 0; 160 for (c = 0; c < nbridge; c++) 161 baddr = ((uint64_t)baddr << 32) | cell[regno++]; 162 rsize = 0; 163 for (c = 0; c < nsize; c++) 164 rsize = ((uint64_t)rsize << 32) | cell[regno++]; 165 if (addr < raddr || addr >= raddr + rsize) 166 continue; 167 addr = addr - raddr + baddr; 168 if (rspc != OFW_PADDR_NOT_PCI) 169 spc = rspc; 170 } 171 next: 172 bridge = parent; 173 parent = OF_parent(bridge); 174 get_addr_props(bridge, &naddr, &nsize, &pci); 175 } 176 177 KASSERT(addr <= BUS_SPACE_MAXADDR, 178 ("Bus address is too large: %jx", (uintmax_t)addr)); 179 KASSERT(size <= BUS_SPACE_MAXSIZE, 180 ("Bus size is too large: %jx", (uintmax_t)size)); 181 182 *paddr = addr; 183 *psize = size; 184 if (ppci_hi != NULL) 185 *ppci_hi = pci_hi; 186 187 return (0); 188 } 189 190 /* 191 * This is intended to be called early on, right after the OF system is 192 * initialized, so pmap may not be up yet. 193 */ 194 int 195 ofw_parse_bootargs(void) 196 { 197 phandle_t chosen; 198 char buf[2048]; /* early stack supposedly big enough */ 199 int err; 200 201 chosen = OF_finddevice("/chosen"); 202 if (chosen == -1) 203 return (chosen); 204 205 if ((err = OF_getprop(chosen, "bootargs", buf, sizeof(buf))) != -1) { 206 boothowto |= boot_parse_cmdline(buf); 207 return (0); 208 } 209 210 return (err); 211 } 212