ofw_subr.c revision 294927
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: head/sys/dev/ofw/ofw_subr.c 294927 2016-01-27 17:33:31Z andrew $"); 33 34#include <sys/param.h> 35#include <sys/bus.h> 36#include <sys/libkern.h> 37 38#include <machine/bus.h> 39 40#include <dev/ofw/openfirm.h> 41#include <dev/ofw/ofw_pci.h> 42#include <dev/ofw/ofw_subr.h> 43 44static void 45get_addr_props(phandle_t node, uint32_t *addrp, uint32_t *sizep, int *pcip) 46{ 47 char type[64]; 48 uint32_t addr, size; 49 int pci, res; 50 51 res = OF_getencprop(node, "#address-cells", &addr, sizeof(addr)); 52 if (res == -1) 53 addr = 2; 54 res = OF_getencprop(node, "#size-cells", &size, sizeof(size)); 55 if (res == -1) 56 size = 1; 57 pci = 0; 58 if (addr == 3 && size == 2) { 59 res = OF_getprop(node, "device_type", type, sizeof(type)); 60 if (res != -1) { 61 type[sizeof(type) - 1] = '\0'; 62 pci = (strcmp(type, "pci") == 0) ? 1 : 0; 63 } 64 } 65 if (addrp != NULL) 66 *addrp = addr; 67 if (sizep != NULL) 68 *sizep = size; 69 if (pcip != NULL) 70 *pcip = pci; 71} 72 73int 74ofw_reg_to_paddr(phandle_t dev, int regno, bus_addr_t *paddr, 75 bus_size_t *psize, pcell_t *ppci_hi) 76{ 77 pcell_t cell[32], pci_hi; 78 uint64_t addr, raddr, baddr; 79 uint64_t size, rsize; 80 uint32_t c, nbridge, naddr, nsize; 81 phandle_t bridge, parent; 82 u_int spc, rspc; 83 int pci, pcib, res; 84 85 /* Sanity checking. */ 86 if (dev == 0) 87 return (EINVAL); 88 bridge = OF_parent(dev); 89 if (bridge == 0) 90 return (EINVAL); 91 if (regno < 0) 92 return (EINVAL); 93 if (paddr == NULL || psize == NULL) 94 return (EINVAL); 95 96 get_addr_props(bridge, &naddr, &nsize, &pci); 97 res = OF_getencprop(dev, (pci) ? "assigned-addresses" : "reg", 98 cell, sizeof(cell)); 99 if (res == -1) 100 return (ENXIO); 101 if (res % sizeof(cell[0])) 102 return (ENXIO); 103 res /= sizeof(cell[0]); 104 regno *= naddr + nsize; 105 if (regno + naddr + nsize > res) 106 return (EINVAL); 107 pci_hi = pci ? cell[regno] : OFW_PADDR_NOT_PCI; 108 spc = pci_hi & OFW_PCI_PHYS_HI_SPACEMASK; 109 addr = 0; 110 for (c = 0; c < naddr; c++) 111 addr = ((uint64_t)addr << 32) | cell[regno++]; 112 size = 0; 113 for (c = 0; c < nsize; c++) 114 size = ((uint64_t)size << 32) | cell[regno++]; 115 /* 116 * Map the address range in the bridge's decoding window as given 117 * by the "ranges" property. If a node doesn't have such property 118 * or the property is empty, we assume an identity mapping. The 119 * standard says a missing property indicates no possible mapping. 120 * This code is more liberal since the intended use is to get a 121 * console running early, and a printf to warn of malformed data 122 * is probably futile before the console is fully set up. 123 */ 124 parent = OF_parent(bridge); 125 while (parent != 0) { 126 get_addr_props(parent, &nbridge, NULL, &pcib); 127 res = OF_getencprop(bridge, "ranges", cell, sizeof(cell)); 128 if (res < 1) 129 goto next; 130 if (res % sizeof(cell[0])) 131 return (ENXIO); 132 /* Capture pci_hi if we just transitioned onto a PCI bus. */ 133 if (pcib && pci_hi == OFW_PADDR_NOT_PCI) { 134 pci_hi = cell[0]; 135 spc = pci_hi & OFW_PCI_PHYS_HI_SPACEMASK; 136 } 137 res /= sizeof(cell[0]); 138 regno = 0; 139 while (regno < res) { 140 rspc = (pci ? cell[regno] : OFW_PADDR_NOT_PCI) & 141 OFW_PCI_PHYS_HI_SPACEMASK; 142 if (rspc != spc) { 143 regno += naddr + nbridge + nsize; 144 continue; 145 } 146 raddr = 0; 147 for (c = 0; c < naddr; c++) 148 raddr = ((uint64_t)raddr << 32) | cell[regno++]; 149 rspc = (pcib) 150 ? cell[regno] & OFW_PCI_PHYS_HI_SPACEMASK 151 : OFW_PADDR_NOT_PCI; 152 baddr = 0; 153 for (c = 0; c < nbridge; c++) 154 baddr = ((uint64_t)baddr << 32) | cell[regno++]; 155 rsize = 0; 156 for (c = 0; c < nsize; c++) 157 rsize = ((uint64_t)rsize << 32) | cell[regno++]; 158 if (addr < raddr || addr >= raddr + rsize) 159 continue; 160 addr = addr - raddr + baddr; 161 if (rspc != OFW_PADDR_NOT_PCI) 162 spc = rspc; 163 } 164 next: 165 bridge = parent; 166 parent = OF_parent(bridge); 167 get_addr_props(bridge, &naddr, &nsize, &pci); 168 } 169 170 KASSERT(addr <= BUS_SPACE_MAXADDR, 171 ("Bus sddress is too large: %jx", (intmax_t)addr)); 172 KASSERT(size <= BUS_SPACE_MAXSIZE, 173 ("Bus size is too large: %jx", (intmax_t)addr)); 174 175 *paddr = addr; 176 *psize = size; 177 if (ppci_hi != NULL) 178 *ppci_hi = pci_hi; 179 180 return (0); 181} 182