1 /*- 2 * Copyright (c) 2015 Ian Lepore <ian@freebsd.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * The initial ofw_reg_to_paddr() implementation has been copied from powerpc 27 * ofw_machdep.c OF_decode_addr(). It was added by Marcel Moolenaar, who did not 28 * assert copyright with the addition but still deserves credit for the work. 29 */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 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 pcell_t cell[32], pci_hi; 83 uint64_t addr, raddr, baddr; 84 uint64_t size, rsize; 85 uint32_t c, nbridge, naddr, nsize; 86 phandle_t bridge, parent; 87 u_int spc, rspc; 88 int pci, pcib, res; 89 90 /* Sanity checking. */ 91 if (dev == 0) 92 return (EINVAL); 93 bridge = OF_parent(dev); 94 if (bridge == 0) 95 return (EINVAL); 96 if (regno < 0) 97 return (EINVAL); 98 if (paddr == NULL || psize == NULL) 99 return (EINVAL); 100 101 get_addr_props(bridge, &naddr, &nsize, &pci); 102 res = OF_getencprop(dev, (pci) ? "assigned-addresses" : "reg", 103 cell, sizeof(cell)); 104 if (res == -1) 105 return (ENXIO); 106 if (res % sizeof(cell[0])) 107 return (ENXIO); 108 res /= sizeof(cell[0]); 109 regno *= naddr + nsize; 110 if (regno + naddr + nsize > res) 111 return (EINVAL); 112 pci_hi = pci ? cell[regno] : OFW_PADDR_NOT_PCI; 113 spc = pci_hi & OFW_PCI_PHYS_HI_SPACEMASK; 114 addr = 0; 115 for (c = 0; c < naddr; c++) 116 addr = ((uint64_t)addr << 32) | cell[regno++]; 117 size = 0; 118 for (c = 0; c < nsize; c++) 119 size = ((uint64_t)size << 32) | cell[regno++]; 120 /* 121 * Map the address range in the bridge's decoding window as given 122 * by the "ranges" property. If a node doesn't have such property 123 * or the property is empty, we assume an identity mapping. The 124 * standard says a missing property indicates no possible mapping. 125 * This code is more liberal since the intended use is to get a 126 * console running early, and a printf to warn of malformed data 127 * is probably futile before the console is fully set up. 128 */ 129 parent = OF_parent(bridge); 130 while (parent != 0) { 131 get_addr_props(parent, &nbridge, NULL, &pcib); 132 res = OF_getencprop(bridge, "ranges", cell, sizeof(cell)); 133 if (res < 1) 134 goto next; 135 if (res % sizeof(cell[0])) 136 return (ENXIO); 137 /* Capture pci_hi if we just transitioned onto a PCI bus. */ 138 if (pcib && pci_hi == OFW_PADDR_NOT_PCI) { 139 pci_hi = cell[0]; 140 spc = pci_hi & OFW_PCI_PHYS_HI_SPACEMASK; 141 } 142 res /= sizeof(cell[0]); 143 regno = 0; 144 while (regno < res) { 145 rspc = (pci ? cell[regno] : OFW_PADDR_NOT_PCI) & 146 OFW_PCI_PHYS_HI_SPACEMASK; 147 if (rspc != spc) { 148 regno += naddr + nbridge + nsize; 149 continue; 150 } 151 raddr = 0; 152 for (c = 0; c < naddr; c++) 153 raddr = ((uint64_t)raddr << 32) | cell[regno++]; 154 rspc = (pcib) 155 ? cell[regno] & OFW_PCI_PHYS_HI_SPACEMASK 156 : OFW_PADDR_NOT_PCI; 157 baddr = 0; 158 for (c = 0; c < nbridge; c++) 159 baddr = ((uint64_t)baddr << 32) | cell[regno++]; 160 rsize = 0; 161 for (c = 0; c < nsize; c++) 162 rsize = ((uint64_t)rsize << 32) | cell[regno++]; 163 if (addr < raddr || addr >= raddr + rsize) 164 continue; 165 addr = addr - raddr + baddr; 166 if (rspc != OFW_PADDR_NOT_PCI) 167 spc = rspc; 168 } 169 next: 170 bridge = parent; 171 parent = OF_parent(bridge); 172 get_addr_props(bridge, &naddr, &nsize, &pci); 173 } 174 175 KASSERT(addr <= BUS_SPACE_MAXADDR, 176 ("Bus address is too large: %jx", (uintmax_t)addr)); 177 KASSERT(size <= BUS_SPACE_MAXSIZE, 178 ("Bus size is too large: %jx", (uintmax_t)size)); 179 180 *paddr = addr; 181 *psize = size; 182 if (ppci_hi != NULL) 183 *ppci_hi = pci_hi; 184 185 return (0); 186 } 187 188 /* 189 * This is intended to be called early on, right after the OF system is 190 * initialized, so pmap may not be up yet. 191 */ 192 int 193 ofw_parse_bootargs(void) 194 { 195 phandle_t chosen; 196 char buf[2048]; /* early stack supposedly big enough */ 197 int err; 198 199 chosen = OF_finddevice("/chosen"); 200 if (chosen == -1) 201 return (chosen); 202 203 if ((err = OF_getprop(chosen, "bootargs", buf, sizeof(buf))) != -1) { 204 boothowto |= boot_parse_cmdline(buf); 205 return (0); 206 } 207 208 return (err); 209 } 210