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