arch/powerpc/boot/devtree.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * devtree.c - convenience functions for device tree manipulation
   4  * Copyright 2007 David Gibson, IBM Corporation.
   5  * Copyright (c) 2007 Freescale Semiconductor, Inc.
   6  *
   7  * Authors: David Gibson <david@gibson.dropbear.id.au>
   8  *          Scott Wood <scottwood@freescale.com>
   9  */
  10 #include <stdarg.h>
  11 #include <stddef.h>
  12 #include "types.h"
  13 #include "string.h"
  14 #include "stdio.h"
  15 #include "ops.h"
  16 #include "of.h"
  17
  18 void dt_fixup_memory(u64 start, u64 size)
  19 {
  20         void *root, *memory;
  21         int naddr, nsize, i;
  22         u32 memreg[4];
  23
  24         root = finddevice("/");
  25         if (getprop(root, "#address-cells", &naddr, sizeof(naddr)) < 0)
  26                 naddr = 2;
  27         else
  28                 naddr = be32_to_cpu(naddr);
  29         if (naddr < 1 || naddr > 2)
  30                 fatal("Can't cope with #address-cells == %d in /\n\r", naddr);
  31
  32         if (getprop(root, "#size-cells", &nsize, sizeof(nsize)) < 0)
  33                 nsize = 1;
  34         else
  35                 nsize = be32_to_cpu(nsize);
  36         if (nsize < 1 || nsize > 2)
  37                 fatal("Can't cope with #size-cells == %d in /\n\r", nsize);
  38
  39         i = 0;
  40         if (naddr == 2)
  41                 memreg[i++] = cpu_to_be32(start >> 32);
  42         memreg[i++] = cpu_to_be32(start & 0xffffffff);
  43         if (nsize == 2)
  44                 memreg[i++] = cpu_to_be32(size >> 32);
  45         memreg[i++] = cpu_to_be32(size & 0xffffffff);
  46
  47         memory = finddevice("/memory");
  48         if (! memory) {
  49                 memory = create_node(NULL, "memory");
  50                 setprop_str(memory, "device_type", "memory");
  51         }
  52
  53         printf("Memory <- <0x%x", be32_to_cpu(memreg[0]));
  54         for (i = 1; i < (naddr + nsize); i++)
  55                 printf(" 0x%x", be32_to_cpu(memreg[i]));
  56         printf("> (%ldMB)\n\r", (unsigned long)(size >> 20));
  57
  58         setprop(memory, "reg", memreg, (naddr + nsize)*sizeof(u32));
  59 }
  60
  61 #define MHZ(x)  ((x + 500000) / 1000000)
  62
  63 void dt_fixup_cpu_clocks(u32 cpu, u32 tb, u32 bus)
  64 {
  65         void *devp = NULL;
  66
  67         printf("CPU clock-frequency <- 0x%x (%dMHz)\n\r", cpu, MHZ(cpu));
  68         printf("CPU timebase-frequency <- 0x%x (%dMHz)\n\r", tb, MHZ(tb));
  69         if (bus > 0)
  70                 printf("CPU bus-frequency <- 0x%x (%dMHz)\n\r", bus, MHZ(bus));
  71
  72         while ((devp = find_node_by_devtype(devp, "cpu"))) {
  73                 setprop_val(devp, "clock-frequency", cpu_to_be32(cpu));
  74                 setprop_val(devp, "timebase-frequency", cpu_to_be32(tb));
  75                 if (bus > 0)
  76                         setprop_val(devp, "bus-frequency", cpu_to_be32(bus));
  77         }
  78
  79         timebase_period_ns = 1000000000 / tb;
  80 }
  81
  82 void dt_fixup_clock(const char *path, u32 freq)
  83 {
  84         void *devp = finddevice(path);
  85
  86         if (devp) {
  87                 printf("%s: clock-frequency <- %x (%dMHz)\n\r", path, freq, MHZ(freq));
  88                 setprop_val(devp, "clock-frequency", cpu_to_be32(freq));
  89         }
  90 }
  91
  92 void dt_fixup_mac_address_by_alias(const char *alias, const u8 *addr)
  93 {
  94         void *devp = find_node_by_alias(alias);
  95
  96         if (devp) {
  97                 printf("%s: local-mac-address <-"
  98                        " %02x:%02x:%02x:%02x:%02x:%02x\n\r", alias,
  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_address(u32 index, const u8 *addr)
 107 {
 108         void *devp = find_node_by_prop_value(NULL, "linux,network-index",
 109                                              (void*)&index, sizeof(index));
 110
 111         if (devp) {
 112                 printf("ENET%d: local-mac-address <-"
 113                        " %02x:%02x:%02x:%02x:%02x:%02x\n\r", index,
 114                        addr[0], addr[1], addr[2],
 115                        addr[3], addr[4], addr[5]);
 116
 117                 setprop(devp, "local-mac-address", addr, 6);
 118         }
 119 }
 120
 121 void __dt_fixup_mac_addresses(u32 startindex, ...)
 122 {
 123         va_list ap;
 124         u32 index = startindex;
 125         const u8 *addr;
 126
 127         va_start(ap, startindex);
 128
 129         while ((addr = va_arg(ap, const u8 *)))
 130                 dt_fixup_mac_address(index++, addr);
 131
 132         va_end(ap);
 133 }
 134
 135 #define MAX_ADDR_CELLS 4
 136
 137 void dt_get_reg_format(void *node, u32 *naddr, u32 *nsize)
 138 {
 139         if (getprop(node, "#address-cells", naddr, 4) != 4)
 140                 *naddr = 2;
 141         else
 142                 *naddr = be32_to_cpu(*naddr);
 143         if (getprop(node, "#size-cells", nsize, 4) != 4)
 144                 *nsize = 1;
 145         else
 146                 *nsize = be32_to_cpu(*nsize);
 147 }
 148
 149 static void copy_val(u32 *dest, u32 *src, int naddr)
 150 {
 151         int pad = MAX_ADDR_CELLS - naddr;
 152
 153         memset(dest, 0, pad * 4);
 154         memcpy(dest + pad, src, naddr * 4);
 155 }
 156
 157 static int sub_reg(u32 *reg, u32 *sub)
 158 {
 159         int i, borrow = 0;
 160
 161         for (i = MAX_ADDR_CELLS - 1; i >= 0; i--) {
 162                 int prev_borrow = borrow;
 163                 borrow = reg[i] < sub[i] + prev_borrow;
 164                 reg[i] -= sub[i] + prev_borrow;
 165         }
 166
 167         return !borrow;
 168 }
 169
 170 static int add_reg(u32 *reg, u32 *add, int naddr)
 171 {
 172         int i, carry = 0;
 173
 174         for (i = MAX_ADDR_CELLS - 1; i >= MAX_ADDR_CELLS - naddr; i--) {
 175                 u64 tmp = (u64)be32_to_cpu(reg[i]) + be32_to_cpu(add[i]) + carry;
 176                 carry = tmp >> 32;
 177                 reg[i] = cpu_to_be32((u32)tmp);
 178         }
 179
 180         return !carry;
 181 }
 182
 183 /* It is assumed that if the first byte of reg fits in a
 184  * range, then the whole reg block fits.
 185  */
 186 static int compare_reg(u32 *reg, u32 *range, u32 *rangesize)
 187 {
 188         int i;
 189         u32 end;
 190
 191         for (i = 0; i < MAX_ADDR_CELLS; i++) {
 192                 if (be32_to_cpu(reg[i]) < be32_to_cpu(range[i]))
 193                         return 0;
 194                 if (be32_to_cpu(reg[i]) > be32_to_cpu(range[i]))
 195                         break;
 196         }
 197
 198         for (i = 0; i < MAX_ADDR_CELLS; i++) {
 199                 end = be32_to_cpu(range[i]) + be32_to_cpu(rangesize[i]);
 200
 201                 if (be32_to_cpu(reg[i]) < end)
 202                         break;
 203                 if (be32_to_cpu(reg[i]) > end)
 204                         return 0;
 205         }
 206
 207         return reg[i] != end;
 208 }
 209
 210 /* reg must be MAX_ADDR_CELLS */
 211 static int find_range(u32 *reg, u32 *ranges, int nregaddr,
 212                       int naddr, int nsize, int buflen)
 213 {
 214         int nrange = nregaddr + naddr + nsize;
 215         int i;
 216
 217         for (i = 0; i + nrange <= buflen; i += nrange) {
 218                 u32 range_addr[MAX_ADDR_CELLS];
 219                 u32 range_size[MAX_ADDR_CELLS];
 220
 221                 copy_val(range_addr, ranges + i, nregaddr);
 222                 copy_val(range_size, ranges + i + nregaddr + naddr, nsize);
 223
 224                 if (compare_reg(reg, range_addr, range_size))
 225                         return i;
 226         }
 227
 228         return -1;
 229 }
 230
 231 /* Currently only generic buses without special encodings are supported.
 232  * In particular, PCI is not supported.  Also, only the beginning of the
 233  * reg block is tracked; size is ignored except in ranges.
 234  */
 235 static u32 prop_buf[MAX_PROP_LEN / 4];
 236
 237 static int dt_xlate(void *node, int res, int reglen, unsigned long *addr,
 238                 unsigned long *size)
 239 {
 240         u32 last_addr[MAX_ADDR_CELLS];
 241         u32 this_addr[MAX_ADDR_CELLS];
 242         void *parent;
 243         u64 ret_addr, ret_size;
 244         u32 naddr, nsize, prev_naddr, prev_nsize;
 245         int buflen, offset;
 246
 247         parent = get_parent(node);
 248         if (!parent)
 249                 return 0;
 250
 251         dt_get_reg_format(parent, &naddr, &nsize);
 252         if (nsize > 2)
 253                 return 0;
 254
 255         offset = (naddr + nsize) * res;
 256
 257         if (reglen < offset + naddr + nsize ||
 258             MAX_PROP_LEN < (offset + naddr + nsize) * 4)
 259                 return 0;
 260
 261         copy_val(last_addr, prop_buf + offset, naddr);
 262
 263         ret_size = be32_to_cpu(prop_buf[offset + naddr]);
 264         if (nsize == 2) {
 265                 ret_size <<= 32;
 266                 ret_size |= be32_to_cpu(prop_buf[offset + naddr + 1]);
 267         }
 268
 269         for (;;) {
 270                 prev_naddr = naddr;
 271                 prev_nsize = nsize;
 272                 node = parent;
 273
 274                 parent = get_parent(node);
 275                 if (!parent)
 276                         break;
 277
 278                 dt_get_reg_format(parent, &naddr, &nsize);
 279
 280                 buflen = getprop(node, "ranges", prop_buf,
 281                                 sizeof(prop_buf));
 282                 if (buflen == 0)
 283                         continue;
 284                 if (buflen < 0 || buflen > sizeof(prop_buf))
 285                         return 0;
 286
 287                 offset = find_range(last_addr, prop_buf, prev_naddr,
 288                                     naddr, prev_nsize, buflen / 4);
 289                 if (offset < 0)
 290                         return 0;
 291
 292                 copy_val(this_addr, prop_buf + offset, prev_naddr);
 293
 294                 if (!sub_reg(last_addr, this_addr))
 295                         return 0;
 296
 297                 copy_val(this_addr, prop_buf + offset + prev_naddr, naddr);
 298
 299                 if (!add_reg(last_addr, this_addr, naddr))
 300                         return 0;
 301         }
 302
 303         if (naddr > 2)
 304                 return 0;
 305
 306         ret_addr = ((u64)be32_to_cpu(last_addr[2]) << 32) | be32_to_cpu(last_addr[3]);
 307         if (sizeof(void *) == 4 &&
 308             (ret_addr >= 0x100000000ULL || ret_size > 0x100000000ULL ||
 309              ret_addr + ret_size > 0x100000000ULL))
 310                 return 0;
 311
 312         *addr = ret_addr;
 313         if (size)
 314                 *size = ret_size;
 315
 316         return 1;
 317 }
 318
 319 int dt_xlate_reg(void *node, int res, unsigned long *addr, unsigned long *size)
 320 {
 321         int reglen;
 322
 323         reglen = getprop(node, "reg", prop_buf, sizeof(prop_buf)) / 4;
 324         return dt_xlate(node, res, reglen, addr, size);
 325 }
 326
 327 int dt_xlate_addr(void *node, u32 *buf, int buflen, unsigned long *xlated_addr)
 328 {
 329
 330         if (buflen > sizeof(prop_buf))
 331                 return 0;
 332
 333         memcpy(prop_buf, buf, buflen);
 334         return dt_xlate(node, 0, buflen / 4, xlated_addr, NULL);
 335 }
 336
 337 int dt_is_compatible(void *node, const char *compat)
 338 {
 339         char *buf = (char *)prop_buf;
 340         int len, pos;
 341
 342         len = getprop(node, "compatible", buf, MAX_PROP_LEN);
 343         if (len < 0)
 344                 return 0;
 345
 346         for (pos = 0; pos < len; pos++) {
 347                 if (!strcmp(buf + pos, compat))
 348                         return 1;
 349
 350                 pos += strnlen(&buf[pos], len - pos);
 351         }
 352
 353         return 0;
 354 }
 355
 356 int dt_get_virtual_reg(void *node, void **addr, int nres)
 357 {
 358         unsigned long xaddr;
 359         int n, i;
 360
 361         n = getprop(node, "virtual-reg", addr, nres * 4);
 362         if (n > 0) {
 363                 for (i = 0; i < n/4; i ++)
 364                         ((u32 *)addr)[i] = be32_to_cpu(((u32 *)addr)[i]);
 365                 return n / 4;
 366         }
 367
 368         for (n = 0; n < nres; n++) {
 369                 if (!dt_xlate_reg(node, n, &xaddr, NULL))
 370                         break;
 371
 372                 addr[n] = (void *)xaddr;
 373         }
 374
 375         return n;
 376 }
 377