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
  17 void dt_fixup_memory(u64 start, u64 size)
  18 {
  19         void *root, *memory;
  20         int naddr, nsize, i;
  21         u32 memreg[4];
  22
  23         root = finddevice("/");
  24         if (getprop(root, "#address-cells", &naddr, sizeof(naddr)) < 0)
  25                 naddr = 2;
  26         if (naddr < 1 || naddr > 2)
  27                 fatal("Can't cope with #address-cells == %d in /\n\r", naddr);
  28
  29         if (getprop(root, "#size-cells", &nsize, sizeof(nsize)) < 0)
  30                 nsize = 1;
  31         if (nsize < 1 || nsize > 2)
  32                 fatal("Can't cope with #size-cells == %d in /\n\r", nsize);
  33
  34         i = 0;
  35         if (naddr == 2)
  36                 memreg[i++] = start >> 32;
  37         memreg[i++] = start & 0xffffffff;
  38         if (nsize == 2)
  39                 memreg[i++] = size >> 32;
  40         memreg[i++] = size & 0xffffffff;
  41
  42         memory = finddevice("/memory");
  43         if (! memory) {
  44                 memory = create_node(NULL, "memory");
  45                 setprop_str(memory, "device_type", "memory");
  46         }
  47
  48         printf("Memory <- <0x%x", memreg[0]);
  49         for (i = 1; i < (naddr + nsize); i++)
  50                 printf(" 0x%x", memreg[i]);
  51         printf("> (%ldMB)\n\r", (unsigned long)(size >> 20));
  52
  53         setprop(memory, "reg", memreg, (naddr + nsize)*sizeof(u32));
  54 }
  55
  56 #define MHZ(x)  ((x + 500000) / 1000000)
  57
  58 void dt_fixup_cpu_clocks(u32 cpu, u32 tb, u32 bus)
  59 {
  60         void *devp = NULL;
  61
  62         printf("CPU clock-frequency <- 0x%x (%dMHz)\n\r", cpu, MHZ(cpu));
  63         printf("CPU timebase-frequency <- 0x%x (%dMHz)\n\r", tb, MHZ(tb));
  64         if (bus > 0)
  65                 printf("CPU bus-frequency <- 0x%x (%dMHz)\n\r", bus, MHZ(bus));
  66
  67         while ((devp = find_node_by_devtype(devp, "cpu"))) {
  68                 setprop_val(devp, "clock-frequency", cpu);
  69                 setprop_val(devp, "timebase-frequency", tb);
  70                 if (bus > 0)
  71                         setprop_val(devp, "bus-frequency", bus);
  72         }
  73
  74         timebase_period_ns = 1000000000 / tb;
  75 }
  76
  77 void dt_fixup_clock(const char *path, u32 freq)
  78 {
  79         void *devp = finddevice(path);
  80
  81         if (devp) {
  82                 printf("%s: clock-frequency <- %x (%dMHz)\n\r", path, freq, MHZ(freq));
  83                 setprop_val(devp, "clock-frequency", freq);
  84         }
  85 }
  86
  87 void dt_fixup_mac_address_by_alias(const char *alias, const u8 *addr)
  88 {
  89         void *devp = find_node_by_alias(alias);
  90
  91         if (devp) {
  92                 printf("%s: local-mac-address <-"
  93                        " %02x:%02x:%02x:%02x:%02x:%02x\n\r", alias,
  94                        addr[0], addr[1], addr[2],
  95                        addr[3], addr[4], addr[5]);
  96
  97                 setprop(devp, "local-mac-address", addr, 6);
  98         }
  99 }
 100
 101 void dt_fixup_mac_address(u32 index, const u8 *addr)
 102 {
 103         void *devp = find_node_by_prop_value(NULL, "linux,network-index",
 104                                              (void*)&index, sizeof(index));
 105
 106         if (devp) {
 107                 printf("ENET%d: local-mac-address <-"
 108                        " %02x:%02x:%02x:%02x:%02x:%02x\n\r", index,
 109                        addr[0], addr[1], addr[2],
 110                        addr[3], addr[4], addr[5]);
 111
 112                 setprop(devp, "local-mac-address", addr, 6);
 113         }
 114 }
 115
 116 void __dt_fixup_mac_addresses(u32 startindex, ...)
 117 {
 118         va_list ap;
 119         u32 index = startindex;
 120         const u8 *addr;
 121
 122         va_start(ap, startindex);
 123
 124         while ((addr = va_arg(ap, const u8 *)))
 125                 dt_fixup_mac_address(index++, addr);
 126
 127         va_end(ap);
 128 }
 129
 130 #define MAX_ADDR_CELLS 4
 131
 132 void dt_get_reg_format(void *node, u32 *naddr, u32 *nsize)
 133 {
 134         if (getprop(node, "#address-cells", naddr, 4) != 4)
 135                 *naddr = 2;
 136         if (getprop(node, "#size-cells", nsize, 4) != 4)
 137                 *nsize = 1;
 138 }
 139
 140 static void copy_val(u32 *dest, u32 *src, int naddr)
 141 {
 142         int pad = MAX_ADDR_CELLS - naddr;
 143
 144         memset(dest, 0, pad * 4);
 145         memcpy(dest + pad, src, naddr * 4);
 146 }
 147
 148 static int sub_reg(u32 *reg, u32 *sub)
 149 {
 150         int i, borrow = 0;
 151
 152         for (i = MAX_ADDR_CELLS - 1; i >= 0; i--) {
 153                 int prev_borrow = borrow;
 154                 borrow = reg[i] < sub[i] + prev_borrow;
 155                 reg[i] -= sub[i] + prev_borrow;
 156         }
 157
 158         return !borrow;
 159 }
 160
 161 static int add_reg(u32 *reg, u32 *add, int naddr)
 162 {
 163         int i, carry = 0;
 164
 165         for (i = MAX_ADDR_CELLS - 1; i >= MAX_ADDR_CELLS - naddr; i--) {
 166                 u64 tmp = (u64)reg[i] + add[i] + carry;
 167                 carry = tmp >> 32;
 168                 reg[i] = (u32)tmp;
 169         }
 170
 171         return !carry;
 172 }
 173
 174 /* It is assumed that if the first byte of reg fits in a
 175  * range, then the whole reg block fits.
 176  */
 177 static int compare_reg(u32 *reg, u32 *range, u32 *rangesize)
 178 {
 179         int i;
 180         u32 end;
 181
 182         for (i = 0; i < MAX_ADDR_CELLS; i++) {
 183                 if (reg[i] < range[i])
 184                         return 0;
 185                 if (reg[i] > range[i])
 186                         break;
 187         }
 188
 189         for (i = 0; i < MAX_ADDR_CELLS; i++) {
 190                 end = range[i] + rangesize[i];
 191
 192                 if (reg[i] < end)
 193                         break;
 194                 if (reg[i] > end)
 195                         return 0;
 196         }
 197
 198         return reg[i] != end;
 199 }
 200
 201 /* reg must be MAX_ADDR_CELLS */
 202 static int find_range(u32 *reg, u32 *ranges, int nregaddr,
 203                       int naddr, int nsize, int buflen)
 204 {
 205         int nrange = nregaddr + naddr + nsize;
 206         int i;
 207
 208         for (i = 0; i + nrange <= buflen; i += nrange) {
 209                 u32 range_addr[MAX_ADDR_CELLS];
 210                 u32 range_size[MAX_ADDR_CELLS];
 211
 212                 copy_val(range_addr, ranges + i, nregaddr);
 213                 copy_val(range_size, ranges + i + nregaddr + naddr, nsize);
 214
 215                 if (compare_reg(reg, range_addr, range_size))
 216                         return i;
 217         }
 218
 219         return -1;
 220 }
 221
 222 /* Currently only generic buses without special encodings are supported.
 223  * In particular, PCI is not supported.  Also, only the beginning of the
 224  * reg block is tracked; size is ignored except in ranges.
 225  */
 226 static u32 prop_buf[MAX_PROP_LEN / 4];
 227
 228 static int dt_xlate(void *node, int res, int reglen, unsigned long *addr,
 229                 unsigned long *size)
 230 {
 231         u32 last_addr[MAX_ADDR_CELLS];
 232         u32 this_addr[MAX_ADDR_CELLS];
 233         void *parent;
 234         u64 ret_addr, ret_size;
 235         u32 naddr, nsize, prev_naddr, prev_nsize;
 236         int buflen, offset;
 237
 238         parent = get_parent(node);
 239         if (!parent)
 240                 return 0;
 241
 242         dt_get_reg_format(parent, &naddr, &nsize);
 243
 244         if (nsize > 2)
 245                 return 0;
 246
 247         offset = (naddr + nsize) * res;
 248
 249         if (reglen < offset + naddr + nsize ||
 250             MAX_PROP_LEN < (offset + naddr + nsize) * 4)
 251                 return 0;
 252
 253         copy_val(last_addr, prop_buf + offset, naddr);
 254
 255         ret_size = prop_buf[offset + naddr];
 256         if (nsize == 2) {
 257                 ret_size <<= 32;
 258                 ret_size |= prop_buf[offset + naddr + 1];
 259         }
 260
 261         for (;;) {
 262                 prev_naddr = naddr;
 263                 prev_nsize = nsize;
 264                 node = parent;
 265
 266                 parent = get_parent(node);
 267                 if (!parent)
 268                         break;
 269
 270                 dt_get_reg_format(parent, &naddr, &nsize);
 271
 272                 buflen = getprop(node, "ranges", prop_buf,
 273                                 sizeof(prop_buf));
 274                 if (buflen == 0)
 275                         continue;
 276                 if (buflen < 0 || buflen > sizeof(prop_buf))
 277                         return 0;
 278
 279                 offset = find_range(last_addr, prop_buf, prev_naddr,
 280                                     naddr, prev_nsize, buflen / 4);
 281
 282                 if (offset < 0)
 283                         return 0;
 284
 285                 copy_val(this_addr, prop_buf + offset, prev_naddr);
 286
 287                 if (!sub_reg(last_addr, this_addr))
 288                         return 0;
 289
 290                 copy_val(this_addr, prop_buf + offset + prev_naddr, naddr);
 291
 292                 if (!add_reg(last_addr, this_addr, naddr))
 293                         return 0;
 294         }
 295
 296         if (naddr > 2)
 297                 return 0;
 298
 299         ret_addr = ((u64)last_addr[2] << 32) | last_addr[3];
 300
 301         if (sizeof(void *) == 4 &&
 302             (ret_addr >= 0x100000000ULL || ret_size > 0x100000000ULL ||
 303              ret_addr + ret_size > 0x100000000ULL))
 304                 return 0;
 305
 306         *addr = ret_addr;
 307         if (size)
 308                 *size = ret_size;
 309
 310         return 1;
 311 }
 312
 313 int dt_xlate_reg(void *node, int res, unsigned long *addr, unsigned long *size)
 314 {
 315         int reglen;
 316
 317         reglen = getprop(node, "reg", prop_buf, sizeof(prop_buf)) / 4;
 318         return dt_xlate(node, res, reglen, addr, size);
 319 }
 320
 321 int dt_xlate_addr(void *node, u32 *buf, int buflen, unsigned long *xlated_addr)
 322 {
 323
 324         if (buflen > sizeof(prop_buf))
 325                 return 0;
 326
 327         memcpy(prop_buf, buf, buflen);
 328         return dt_xlate(node, 0, buflen / 4, xlated_addr, NULL);
 329 }
 330
 331 int dt_is_compatible(void *node, const char *compat)
 332 {
 333         char *buf = (char *)prop_buf;
 334         int len, pos;
 335
 336         len = getprop(node, "compatible", buf, MAX_PROP_LEN);
 337         if (len < 0)
 338                 return 0;
 339
 340         for (pos = 0; pos < len; pos++) {
 341                 if (!strcmp(buf + pos, compat))
 342                         return 1;
 343
 344                 pos += strnlen(&buf[pos], len - pos);
 345         }
 346
 347         return 0;
 348 }
 349
 350 int dt_get_virtual_reg(void *node, void **addr, int nres)
 351 {
 352         unsigned long xaddr;
 353         int n;
 354
 355         n = getprop(node, "virtual-reg", addr, nres * 4);
 356         if (n > 0)
 357                 return n / 4;
 358
 359         for (n = 0; n < nres; n++) {
 360                 if (!dt_xlate_reg(node, n, &xaddr, NULL))
 361                         break;
 362
 363                 addr[n] = (void *)xaddr;
 364         }
 365
 366         return n;
 367 }
 368