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/param.h> 35 #include <sys/boot.h> 36 #include <sys/bus.h> 37 #include <sys/libkern.h> 38 #include <sys/reboot.h> 39 #include <sys/rman.h> 40 41 #include <machine/bus.h> 42 43 #include <dev/ofw/openfirm.h> 44 #include <dev/ofw/ofw_pci.h> 45 #include <dev/ofw/ofw_subr.h> 46 47 static void 48 get_addr_props(phandle_t node, uint32_t *addrp, uint32_t *sizep, int *pcip) 49 { 50 char type[64]; 51 uint32_t addr, size; 52 int pci, res; 53 54 res = OF_getencprop(node, "#address-cells", &addr, sizeof(addr)); 55 if (res == -1) 56 addr = 2; 57 res = OF_getencprop(node, "#size-cells", &size, sizeof(size)); 58 if (res == -1) 59 size = 1; 60 pci = 0; 61 if (addr == 3 && size == 2) { 62 res = OF_getprop(node, "device_type", type, sizeof(type)); 63 if (res != -1) { 64 type[sizeof(type) - 1] = '\0'; 65 if (strcmp(type, "pci") == 0 || 66 strcmp(type, "pciex")== 0) 67 pci = 1; 68 } 69 } 70 if (addrp != NULL) 71 *addrp = addr; 72 if (sizep != NULL) 73 *sizep = size; 74 if (pcip != NULL) 75 *pcip = pci; 76 } 77 78 int 79 ofw_reg_to_paddr(phandle_t dev, int regno, bus_addr_t *paddr, 80 bus_size_t *psize, pcell_t *ppci_hi) 81 { 82 static pcell_t cell[256]; 83 pcell_t pci_hi; 84 uint64_t addr, raddr, baddr; 85 uint64_t size, rsize; 86 uint32_t c, nbridge, naddr, nsize; 87 phandle_t bridge, parent; 88 u_int spc, rspc; 89 int pci, pcib, res; 90 91 /* Sanity checking. */ 92 if (dev == 0) 93 return (EINVAL); 94 bridge = OF_parent(dev); 95 if (bridge == 0) 96 return (EINVAL); 97 if (regno < 0) 98 return (EINVAL); 99 if (paddr == NULL || psize == NULL) 100 return (EINVAL); 101 102 get_addr_props(bridge, &naddr, &nsize, &pci); 103 res = OF_getencprop(dev, (pci) ? "assigned-addresses" : "reg", 104 cell, sizeof(cell)); 105 if (res == -1) 106 return (ENXIO); 107 if (res % sizeof(cell[0])) 108 return (ENXIO); 109 res /= sizeof(cell[0]); 110 regno *= naddr + nsize; 111 if (regno + naddr + nsize > res) 112 return (EINVAL); 113 pci_hi = pci ? cell[regno] : OFW_PADDR_NOT_PCI; 114 spc = pci_hi & OFW_PCI_PHYS_HI_SPACEMASK; 115 addr = 0; 116 for (c = 0; c < naddr; c++) 117 addr = ((uint64_t)addr << 32) | cell[regno++]; 118 size = 0; 119 for (c = 0; c < nsize; c++) 120 size = ((uint64_t)size << 32) | cell[regno++]; 121 /* 122 * Map the address range in the bridge's decoding window as given 123 * by the "ranges" property. If a node doesn't have such property 124 * or the property is empty, we assume an identity mapping. The 125 * standard says a missing property indicates no possible mapping. 126 * This code is more liberal since the intended use is to get a 127 * console running early, and a printf to warn of malformed data 128 * is probably futile before the console is fully set up. 129 */ 130 parent = OF_parent(bridge); 131 while (parent != 0) { 132 get_addr_props(parent, &nbridge, NULL, &pcib); 133 res = OF_getencprop(bridge, "ranges", cell, sizeof(cell)); 134 if (res < 1) 135 goto next; 136 if (res % sizeof(cell[0])) 137 return (ENXIO); 138 /* Capture pci_hi if we just transitioned onto a PCI bus. */ 139 if (pcib && pci_hi == OFW_PADDR_NOT_PCI) { 140 pci_hi = cell[0]; 141 spc = pci_hi & OFW_PCI_PHYS_HI_SPACEMASK; 142 } 143 res /= sizeof(cell[0]); 144 regno = 0; 145 while (regno < res) { 146 rspc = (pci ? cell[regno] : OFW_PADDR_NOT_PCI) & 147 OFW_PCI_PHYS_HI_SPACEMASK; 148 if (rspc != spc) { 149 regno += naddr + nbridge + nsize; 150 continue; 151 } 152 raddr = 0; 153 for (c = 0; c < naddr; c++) 154 raddr = ((uint64_t)raddr << 32) | cell[regno++]; 155 rspc = (pcib) 156 ? cell[regno] & OFW_PCI_PHYS_HI_SPACEMASK 157 : OFW_PADDR_NOT_PCI; 158 baddr = 0; 159 for (c = 0; c < nbridge; c++) 160 baddr = ((uint64_t)baddr << 32) | cell[regno++]; 161 rsize = 0; 162 for (c = 0; c < nsize; c++) 163 rsize = ((uint64_t)rsize << 32) | cell[regno++]; 164 if (addr < raddr || addr >= raddr + rsize) 165 continue; 166 addr = addr - raddr + baddr; 167 if (rspc != OFW_PADDR_NOT_PCI) 168 spc = rspc; 169 } 170 next: 171 bridge = parent; 172 parent = OF_parent(bridge); 173 get_addr_props(bridge, &naddr, &nsize, &pci); 174 } 175 176 KASSERT(addr <= BUS_SPACE_MAXADDR, 177 ("Bus address is too large: %jx", (uintmax_t)addr)); 178 KASSERT(size <= BUS_SPACE_MAXSIZE, 179 ("Bus size is too large: %jx", (uintmax_t)size)); 180 181 *paddr = addr; 182 *psize = size; 183 if (ppci_hi != NULL) 184 *ppci_hi = pci_hi; 185 186 return (0); 187 } 188 189 /* 190 * This is intended to be called early on, right after the OF system is 191 * initialized, so pmap may not be up yet. 192 */ 193 int 194 ofw_parse_bootargs(void) 195 { 196 phandle_t chosen; 197 char buf[2048]; /* early stack supposedly big enough */ 198 int err; 199 200 chosen = OF_finddevice("/chosen"); 201 if (chosen == -1) 202 return (chosen); 203 204 if ((err = OF_getprop(chosen, "bootargs", buf, sizeof(buf))) != -1) { 205 boothowto |= boot_parse_cmdline(buf); 206 return (0); 207 } 208 209 return (err); 210 } 211