1 /* 2 * devtree.c - convenience functions for device tree manipulation 3 * Copyright 2007 David Gibson, IBM Corporation. 4 * Copyright (c) 2007 Freescale Semiconductor, Inc. 5 * 6 * Authors: David Gibson <david@gibson.dropbear.id.au> 7 * Scott Wood <scottwood@freescale.com> 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License 11 * as published by the Free Software Foundation; either version 12 * 2 of the License, or (at your option) any later version. 13 */ 14 #include <stdarg.h> 15 #include <stddef.h> 16 #include "types.h" 17 #include "string.h" 18 #include "stdio.h" 19 #include "ops.h" 20 21 void dt_fixup_memory(u64 start, u64 size) 22 { 23 void *root, *memory; 24 int naddr, nsize, i; 25 u32 memreg[4]; 26 27 root = finddevice("/"); 28 if (getprop(root, "#address-cells", &naddr, sizeof(naddr)) < 0) 29 naddr = 2; 30 if (naddr < 1 || naddr > 2) 31 fatal("Can't cope with #address-cells == %d in /\n\r", naddr); 32 33 if (getprop(root, "#size-cells", &nsize, sizeof(nsize)) < 0) 34 nsize = 1; 35 if (nsize < 1 || nsize > 2) 36 fatal("Can't cope with #size-cells == %d in /\n\r", nsize); 37 38 i = 0; 39 if (naddr == 2) 40 memreg[i++] = start >> 32; 41 memreg[i++] = start & 0xffffffff; 42 if (nsize == 2) 43 memreg[i++] = size >> 32; 44 memreg[i++] = size & 0xffffffff; 45 46 memory = finddevice("/memory"); 47 if (! memory) { 48 memory = create_node(NULL, "memory"); 49 setprop_str(memory, "device_type", "memory"); 50 } 51 52 printf("Memory <- <0x%x", memreg[0]); 53 for (i = 1; i < (naddr + nsize); i++) 54 printf(" 0x%x", memreg[i]); 55 printf("> (%ldMB)\n\r", (unsigned long)(size >> 20)); 56 57 setprop(memory, "reg", memreg, (naddr + nsize)*sizeof(u32)); 58 } 59 60 #define MHZ(x) ((x + 500000) / 1000000) 61 62 void dt_fixup_cpu_clocks(u32 cpu, u32 tb, u32 bus) 63 { 64 void *devp = NULL; 65 66 printf("CPU clock-frequency <- 0x%x (%dMHz)\n\r", cpu, MHZ(cpu)); 67 printf("CPU timebase-frequency <- 0x%x (%dMHz)\n\r", tb, MHZ(tb)); 68 if (bus > 0) 69 printf("CPU bus-frequency <- 0x%x (%dMHz)\n\r", bus, MHZ(bus)); 70 71 while ((devp = find_node_by_devtype(devp, "cpu"))) { 72 setprop_val(devp, "clock-frequency", cpu); 73 setprop_val(devp, "timebase-frequency", tb); 74 if (bus > 0) 75 setprop_val(devp, "bus-frequency", bus); 76 } 77 78 timebase_period_ns = 1000000000 / tb; 79 } 80 81 void dt_fixup_clock(const char *path, u32 freq) 82 { 83 void *devp = finddevice(path); 84 85 if (devp) { 86 printf("%s: clock-frequency <- %x (%dMHz)\n\r", path, freq, MHZ(freq)); 87 setprop_val(devp, "clock-frequency", freq); 88 } 89 } 90 91 void dt_fixup_mac_address(u32 index, const u8 *addr) 92 { 93 void *devp = find_node_by_prop_value(NULL, "linux,network-index", 94 (void*)&index, sizeof(index)); 95 96 if (devp) { 97 printf("ENET%d: local-mac-address <-" 98 " %02x:%02x:%02x:%02x:%02x:%02x\n\r", index, 99 addr[0], addr[1], addr[2], 100 addr[3], addr[4], addr[5]); 101 102 setprop(devp, "local-mac-address", addr, 6); 103 } 104 } 105 106 void __dt_fixup_mac_addresses(u32 startindex, ...) 107 { 108 va_list ap; 109 u32 index = startindex; 110 const u8 *addr; 111 112 va_start(ap, startindex); 113 114 while ((addr = va_arg(ap, const u8 *))) 115 dt_fixup_mac_address(index++, addr); 116 117 va_end(ap); 118 } 119 120 #define MAX_ADDR_CELLS 4 121 122 void dt_get_reg_format(void *node, u32 *naddr, u32 *nsize) 123 { 124 if (getprop(node, "#address-cells", naddr, 4) != 4) 125 *naddr = 2; 126 if (getprop(node, "#size-cells", nsize, 4) != 4) 127 *nsize = 1; 128 } 129 130 static void copy_val(u32 *dest, u32 *src, int naddr) 131 { 132 int pad = MAX_ADDR_CELLS - naddr; 133 134 memset(dest, 0, pad * 4); 135 memcpy(dest + pad, src, naddr * 4); 136 } 137 138 static int sub_reg(u32 *reg, u32 *sub) 139 { 140 int i, borrow = 0; 141 142 for (i = MAX_ADDR_CELLS - 1; i >= 0; i--) { 143 int prev_borrow = borrow; 144 borrow = reg[i] < sub[i] + prev_borrow; 145 reg[i] -= sub[i] + prev_borrow; 146 } 147 148 return !borrow; 149 } 150 151 static int add_reg(u32 *reg, u32 *add, int naddr) 152 { 153 int i, carry = 0; 154 155 for (i = MAX_ADDR_CELLS - 1; i >= MAX_ADDR_CELLS - naddr; i--) { 156 u64 tmp = (u64)reg[i] + add[i] + carry; 157 carry = tmp >> 32; 158 reg[i] = (u32)tmp; 159 } 160 161 return !carry; 162 } 163 164 /* It is assumed that if the first byte of reg fits in a 165 * range, then the whole reg block fits. 166 */ 167 static int compare_reg(u32 *reg, u32 *range, u32 *rangesize) 168 { 169 int i; 170 u32 end; 171 172 for (i = 0; i < MAX_ADDR_CELLS; i++) { 173 if (reg[i] < range[i]) 174 return 0; 175 if (reg[i] > range[i]) 176 break; 177 } 178 179 for (i = 0; i < MAX_ADDR_CELLS; i++) { 180 end = range[i] + rangesize[i]; 181 182 if (reg[i] < end) 183 break; 184 if (reg[i] > end) 185 return 0; 186 } 187 188 return reg[i] != end; 189 } 190 191 /* reg must be MAX_ADDR_CELLS */ 192 static int find_range(u32 *reg, u32 *ranges, int nregaddr, 193 int naddr, int nsize, int buflen) 194 { 195 int nrange = nregaddr + naddr + nsize; 196 int i; 197 198 for (i = 0; i + nrange <= buflen; i += nrange) { 199 u32 range_addr[MAX_ADDR_CELLS]; 200 u32 range_size[MAX_ADDR_CELLS]; 201 202 copy_val(range_addr, ranges + i, naddr); 203 copy_val(range_size, ranges + i + nregaddr + naddr, nsize); 204 205 if (compare_reg(reg, range_addr, range_size)) 206 return i; 207 } 208 209 return -1; 210 } 211 212 /* Currently only generic buses without special encodings are supported. 213 * In particular, PCI is not supported. Also, only the beginning of the 214 * reg block is tracked; size is ignored except in ranges. 215 */ 216 static u32 prop_buf[MAX_PROP_LEN / 4]; 217 218 static int dt_xlate(void *node, int res, int reglen, unsigned long *addr, 219 unsigned long *size) 220 { 221 u32 last_addr[MAX_ADDR_CELLS]; 222 u32 this_addr[MAX_ADDR_CELLS]; 223 void *parent; 224 u64 ret_addr, ret_size; 225 u32 naddr, nsize, prev_naddr, prev_nsize; 226 int buflen, offset; 227 228 parent = get_parent(node); 229 if (!parent) 230 return 0; 231 232 dt_get_reg_format(parent, &naddr, &nsize); 233 234 if (nsize > 2) 235 return 0; 236 237 offset = (naddr + nsize) * res; 238 239 if (reglen < offset + naddr + nsize || 240 MAX_PROP_LEN < (offset + naddr + nsize) * 4) 241 return 0; 242 243 copy_val(last_addr, prop_buf + offset, naddr); 244 245 ret_size = prop_buf[offset + naddr]; 246 if (nsize == 2) { 247 ret_size <<= 32; 248 ret_size |= prop_buf[offset + naddr + 1]; 249 } 250 251 for (;;) { 252 prev_naddr = naddr; 253 prev_nsize = nsize; 254 node = parent; 255 256 parent = get_parent(node); 257 if (!parent) 258 break; 259 260 dt_get_reg_format(parent, &naddr, &nsize); 261 262 buflen = getprop(node, "ranges", prop_buf, 263 sizeof(prop_buf)); 264 if (buflen == 0) 265 continue; 266 if (buflen < 0 || buflen > sizeof(prop_buf)) 267 return 0; 268 269 offset = find_range(last_addr, prop_buf, prev_naddr, 270 naddr, prev_nsize, buflen / 4); 271 272 if (offset < 0) 273 return 0; 274 275 copy_val(this_addr, prop_buf + offset, prev_naddr); 276 277 if (!sub_reg(last_addr, this_addr)) 278 return 0; 279 280 copy_val(this_addr, prop_buf + offset + prev_naddr, naddr); 281 282 if (!add_reg(last_addr, this_addr, naddr)) 283 return 0; 284 } 285 286 if (naddr > 2) 287 return 0; 288 289 ret_addr = ((u64)last_addr[2] << 32) | last_addr[3]; 290 291 if (sizeof(void *) == 4 && 292 (ret_addr >= 0x100000000ULL || ret_size > 0x100000000ULL || 293 ret_addr + ret_size > 0x100000000ULL)) 294 return 0; 295 296 *addr = ret_addr; 297 if (size) 298 *size = ret_size; 299 300 return 1; 301 } 302 303 int dt_xlate_reg(void *node, int res, unsigned long *addr, unsigned long *size) 304 { 305 int reglen; 306 307 reglen = getprop(node, "reg", prop_buf, sizeof(prop_buf)) / 4; 308 return dt_xlate(node, res, reglen, addr, size); 309 } 310 311 int dt_xlate_addr(void *node, u32 *buf, int buflen, unsigned long *xlated_addr) 312 { 313 314 if (buflen > sizeof(prop_buf)) 315 return 0; 316 317 memcpy(prop_buf, buf, buflen); 318 return dt_xlate(node, 0, buflen / 4, xlated_addr, NULL); 319 } 320 321 int dt_is_compatible(void *node, const char *compat) 322 { 323 char *buf = (char *)prop_buf; 324 int len, pos; 325 326 len = getprop(node, "compatible", buf, MAX_PROP_LEN); 327 if (len < 0) 328 return 0; 329 330 for (pos = 0; pos < len; pos++) { 331 if (!strcmp(buf + pos, compat)) 332 return 1; 333 334 pos += strnlen(&buf[pos], len - pos); 335 } 336 337 return 0; 338 } 339