release/src-rt-6.x/linux/linux-2.6/arch/powerpc/boot/devtree.c

   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
  79 void dt_fixup_clock(const char *path, u32 freq)
  80 {
  81         void *devp = finddevice(path);
  82
  83         if (devp) {
  84                 printf("%s: clock-frequency <- %x (%dMHz)\n\r", path, freq, MHZ(freq));
  85                 setprop_val(devp, "clock-frequency", freq);
  86         }
  87 }
  88
  89 void __dt_fixup_mac_addresses(u32 startindex, ...)
  90 {
  91         va_list ap;
  92         u32 index = startindex;
  93         void *devp;
  94         const u8 *addr;
  95
  96         va_start(ap, startindex);
  97         while ((addr = va_arg(ap, const u8 *))) {
  98                 devp = find_node_by_prop_value(NULL, "linux,network-index",
  99                                                (void*)&index, sizeof(index));
 100
 101                 printf("ENET%d: local-mac-address <-"
 102                        " %02x:%02x:%02x:%02x:%02x:%02x\n\r", index,
 103                        addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]);
 104
 105                 if (devp)
 106                         setprop(devp, "local-mac-address", addr, 6);
 107
 108                 index++;
 109         }
 110         va_end(ap);
 111 }
 112
 113 #define MAX_ADDR_CELLS 4
 114 #define MAX_RANGES 8
 115
 116 static void get_reg_format(void *node, u32 *naddr, u32 *nsize)
 117 {
 118         if (getprop(node, "#address-cells", naddr, 4) != 4)
 119                 *naddr = 2;
 120         if (getprop(node, "#size-cells", nsize, 4) != 4)
 121                 *nsize = 1;
 122 }
 123
 124 static void copy_val(u32 *dest, u32 *src, int naddr)
 125 {
 126         int pad = MAX_ADDR_CELLS - naddr;
 127
 128         memset(dest, 0, pad * 4);
 129         memcpy(dest + pad, src, naddr * 4);
 130 }
 131
 132 static int sub_reg(u32 *reg, u32 *sub)
 133 {
 134         int i, borrow = 0;
 135
 136         for (i = MAX_ADDR_CELLS - 1; i >= 0; i--) {
 137                 int prev_borrow = borrow;
 138                 borrow = reg[i] < sub[i] + prev_borrow;
 139                 reg[i] -= sub[i] + prev_borrow;
 140         }
 141
 142         return !borrow;
 143 }
 144
 145 static int add_reg(u32 *reg, u32 *add, int naddr)
 146 {
 147         int i, carry = 0;
 148
 149         for (i = MAX_ADDR_CELLS - 1; i >= MAX_ADDR_CELLS - naddr; i--) {
 150                 u64 tmp = (u64)reg[i] + add[i] + carry;
 151                 carry = tmp >> 32;
 152                 reg[i] = (u32)tmp;
 153         }
 154
 155         return !carry;
 156 }
 157
 158 /* It is assumed that if the first byte of reg fits in a
 159  * range, then the whole reg block fits.
 160  */
 161 static int compare_reg(u32 *reg, u32 *range, u32 *rangesize)
 162 {
 163         int i;
 164         u32 end;
 165
 166         for (i = 0; i < MAX_ADDR_CELLS; i++) {
 167                 if (reg[i] < range[i])
 168                         return 0;
 169                 if (reg[i] > range[i])
 170                         break;
 171         }
 172
 173         for (i = 0; i < MAX_ADDR_CELLS; i++) {
 174                 end = range[i] + rangesize[i];
 175
 176                 if (reg[i] < end)
 177                         break;
 178                 if (reg[i] > end)
 179                         return 0;
 180         }
 181
 182         return reg[i] != end;
 183 }
 184
 185 /* reg must be MAX_ADDR_CELLS */
 186 static int find_range(u32 *reg, u32 *ranges, int nregaddr,
 187                       int naddr, int nsize, int buflen)
 188 {
 189         int nrange = nregaddr + naddr + nsize;
 190         int i;
 191
 192         for (i = 0; i + nrange <= buflen; i += nrange) {
 193                 u32 range_addr[MAX_ADDR_CELLS];
 194                 u32 range_size[MAX_ADDR_CELLS];
 195
 196                 copy_val(range_addr, ranges + i, naddr);
 197                 copy_val(range_size, ranges + i + nregaddr + naddr, nsize);
 198
 199                 if (compare_reg(reg, range_addr, range_size))
 200                         return i;
 201         }
 202
 203         return -1;
 204 }
 205
 206 /* Currently only generic buses without special encodings are supported.
 207  * In particular, PCI is not supported.  Also, only the beginning of the
 208  * reg block is tracked; size is ignored except in ranges.
 209  */
 210 static u32 dt_xlate_buf[MAX_ADDR_CELLS * MAX_RANGES * 3];
 211
 212 static int dt_xlate(void *node, int res, int reglen, unsigned long *addr,
 213                 unsigned long *size)
 214 {
 215         u32 last_addr[MAX_ADDR_CELLS];
 216         u32 this_addr[MAX_ADDR_CELLS];
 217         void *parent;
 218         u64 ret_addr, ret_size;
 219         u32 naddr, nsize, prev_naddr;
 220         int buflen, offset;
 221
 222         parent = get_parent(node);
 223         if (!parent)
 224                 return 0;
 225
 226         get_reg_format(parent, &naddr, &nsize);
 227
 228         if (nsize > 2)
 229                 return 0;
 230
 231         offset = (naddr + nsize) * res;
 232
 233         if (reglen < offset + naddr + nsize ||
 234             sizeof(dt_xlate_buf) < offset + naddr + nsize)
 235                 return 0;
 236
 237         copy_val(last_addr, dt_xlate_buf + offset, naddr);
 238
 239         ret_size = dt_xlate_buf[offset + naddr];
 240         if (nsize == 2) {
 241                 ret_size <<= 32;
 242                 ret_size |= dt_xlate_buf[offset + naddr + 1];
 243         }
 244
 245         while ((node = get_parent(node))) {
 246                 prev_naddr = naddr;
 247
 248                 get_reg_format(node, &naddr, &nsize);
 249
 250                 buflen = getprop(node, "ranges", dt_xlate_buf,
 251                                 sizeof(dt_xlate_buf));
 252                 if (buflen < 0)
 253                         continue;
 254                 if (buflen > sizeof(dt_xlate_buf))
 255                         return 0;
 256
 257                 offset = find_range(last_addr, dt_xlate_buf, prev_naddr,
 258                                     naddr, nsize, buflen / 4);
 259
 260                 if (offset < 0)
 261                         return 0;
 262
 263                 copy_val(this_addr, dt_xlate_buf + offset, prev_naddr);
 264
 265                 if (!sub_reg(last_addr, this_addr))
 266                         return 0;
 267
 268                 copy_val(this_addr, dt_xlate_buf + offset + prev_naddr, naddr);
 269
 270                 if (!add_reg(last_addr, this_addr, naddr))
 271                         return 0;
 272         }
 273
 274         if (naddr > 2)
 275                 return 0;
 276
 277         ret_addr = ((u64)last_addr[2] << 32) | last_addr[3];
 278
 279         if (sizeof(void *) == 4 &&
 280             (ret_addr >= 0x100000000ULL || ret_size > 0x100000000ULL ||
 281              ret_addr + ret_size > 0x100000000ULL))
 282                 return 0;
 283
 284         *addr = ret_addr;
 285         if (size)
 286                 *size = ret_size;
 287
 288         return 1;
 289 }
 290
 291 int dt_xlate_reg(void *node, int res, unsigned long *addr, unsigned long *size)
 292 {
 293         int reglen;
 294
 295         reglen = getprop(node, "reg", dt_xlate_buf, sizeof(dt_xlate_buf)) / 4;
 296         return dt_xlate(node, res, reglen, addr, size);
 297 }
 298
 299 int dt_xlate_addr(void *node, u32 *buf, int buflen, unsigned long *xlated_addr)
 300 {
 301
 302         if (buflen > sizeof(dt_xlate_buf))
 303                 return 0;
 304
 305         memcpy(dt_xlate_buf, buf, buflen);
 306         return dt_xlate(node, 0, buflen / 4, xlated_addr, NULL);
 307 }