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         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_addresses(u32 startindex, ...)
  92 {
  93         va_list ap;
  94         u32 index = startindex;
  95         void *devp;
  96         const u8 *addr;
  97
  98         va_start(ap, startindex);
  99         while ((addr = va_arg(ap, const u8 *))) {
 100                 devp = find_node_by_prop_value(NULL, "linux,network-index",
 101                                                (void*)&index, sizeof(index));
 102
 103                 printf("ENET%d: local-mac-address <-"
 104                        " %02x:%02x:%02x:%02x:%02x:%02x\n\r", index,
 105                        addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]);
 106
 107                 if (devp)
 108                         setprop(devp, "local-mac-address", addr, 6);
 109
 110                 index++;
 111         }
 112         va_end(ap);
 113 }
 114
 115 #define MAX_ADDR_CELLS 4
 116 #define MAX_RANGES 8
 117
 118 static void get_reg_format(void *node, u32 *naddr, u32 *nsize)
 119 {
 120         if (getprop(node, "#address-cells", naddr, 4) != 4)
 121                 *naddr = 2;
 122         if (getprop(node, "#size-cells", nsize, 4) != 4)
 123                 *nsize = 1;
 124 }
 125
 126 static void copy_val(u32 *dest, u32 *src, int naddr)
 127 {
 128         int pad = MAX_ADDR_CELLS - naddr;
 129
 130         memset(dest, 0, pad * 4);
 131         memcpy(dest + pad, src, naddr * 4);
 132 }
 133
 134 static int sub_reg(u32 *reg, u32 *sub)
 135 {
 136         int i, borrow = 0;
 137
 138         for (i = MAX_ADDR_CELLS - 1; i >= 0; i--) {
 139                 int prev_borrow = borrow;
 140                 borrow = reg[i] < sub[i] + prev_borrow;
 141                 reg[i] -= sub[i] + prev_borrow;
 142         }
 143
 144         return !borrow;
 145 }
 146
 147 static int add_reg(u32 *reg, u32 *add, int naddr)
 148 {
 149         int i, carry = 0;
 150
 151         for (i = MAX_ADDR_CELLS - 1; i >= MAX_ADDR_CELLS - naddr; i--) {
 152                 u64 tmp = (u64)reg[i] + add[i] + carry;
 153                 carry = tmp >> 32;
 154                 reg[i] = (u32)tmp;
 155         }
 156
 157         return !carry;
 158 }
 159
 160 /* It is assumed that if the first byte of reg fits in a
 161  * range, then the whole reg block fits.
 162  */
 163 static int compare_reg(u32 *reg, u32 *range, u32 *rangesize)
 164 {
 165         int i;
 166         u32 end;
 167
 168         for (i = 0; i < MAX_ADDR_CELLS; i++) {
 169                 if (reg[i] < range[i])
 170                         return 0;
 171                 if (reg[i] > range[i])
 172                         break;
 173         }
 174
 175         for (i = 0; i < MAX_ADDR_CELLS; i++) {
 176                 end = range[i] + rangesize[i];
 177
 178                 if (reg[i] < end)
 179                         break;
 180                 if (reg[i] > end)
 181                         return 0;
 182         }
 183
 184         return reg[i] != end;
 185 }
 186
 187 /* reg must be MAX_ADDR_CELLS */
 188 static int find_range(u32 *reg, u32 *ranges, int nregaddr,
 189                       int naddr, int nsize, int buflen)
 190 {
 191         int nrange = nregaddr + naddr + nsize;
 192         int i;
 193
 194         for (i = 0; i + nrange <= buflen; i += nrange) {
 195                 u32 range_addr[MAX_ADDR_CELLS];
 196                 u32 range_size[MAX_ADDR_CELLS];
 197
 198                 copy_val(range_addr, ranges + i, naddr);
 199                 copy_val(range_size, ranges + i + nregaddr + naddr, nsize);
 200
 201                 if (compare_reg(reg, range_addr, range_size))
 202                         return i;
 203         }
 204
 205         return -1;
 206 }
 207
 208 /* Currently only generic buses without special encodings are supported.
 209  * In particular, PCI is not supported.  Also, only the beginning of the
 210  * reg block is tracked; size is ignored except in ranges.
 211  */
 212 static u32 dt_xlate_buf[MAX_ADDR_CELLS * MAX_RANGES * 3];
 213
 214 static int dt_xlate(void *node, int res, int reglen, unsigned long *addr,
 215                 unsigned long *size)
 216 {
 217         u32 last_addr[MAX_ADDR_CELLS];
 218         u32 this_addr[MAX_ADDR_CELLS];
 219         void *parent;
 220         u64 ret_addr, ret_size;
 221         u32 naddr, nsize, prev_naddr;
 222         int buflen, offset;
 223
 224         parent = get_parent(node);
 225         if (!parent)
 226                 return 0;
 227
 228         get_reg_format(parent, &naddr, &nsize);
 229
 230         if (nsize > 2)
 231                 return 0;
 232
 233         offset = (naddr + nsize) * res;
 234
 235         if (reglen < offset + naddr + nsize ||
 236             sizeof(dt_xlate_buf) < offset + naddr + nsize)
 237                 return 0;
 238
 239         copy_val(last_addr, dt_xlate_buf + offset, naddr);
 240
 241         ret_size = dt_xlate_buf[offset + naddr];
 242         if (nsize == 2) {
 243                 ret_size <<= 32;
 244                 ret_size |= dt_xlate_buf[offset + naddr + 1];
 245         }
 246
 247         while ((node = get_parent(node))) {
 248                 prev_naddr = naddr;
 249
 250                 get_reg_format(node, &naddr, &nsize);
 251
 252                 buflen = getprop(node, "ranges", dt_xlate_buf,
 253                                 sizeof(dt_xlate_buf));
 254                 if (buflen < 0)
 255                         continue;
 256                 if (buflen > sizeof(dt_xlate_buf))
 257                         return 0;
 258
 259                 offset = find_range(last_addr, dt_xlate_buf, prev_naddr,
 260                                     naddr, nsize, buflen / 4);
 261
 262                 if (offset < 0)
 263                         return 0;
 264
 265                 copy_val(this_addr, dt_xlate_buf + offset, prev_naddr);
 266
 267                 if (!sub_reg(last_addr, this_addr))
 268                         return 0;
 269
 270                 copy_val(this_addr, dt_xlate_buf + offset + prev_naddr, naddr);
 271
 272                 if (!add_reg(last_addr, this_addr, naddr))
 273                         return 0;
 274         }
 275
 276         if (naddr > 2)
 277                 return 0;
 278
 279         ret_addr = ((u64)last_addr[2] << 32) | last_addr[3];
 280
 281         if (sizeof(void *) == 4 &&
 282             (ret_addr >= 0x100000000ULL || ret_size > 0x100000000ULL ||
 283              ret_addr + ret_size > 0x100000000ULL))
 284                 return 0;
 285
 286         *addr = ret_addr;
 287         if (size)
 288                 *size = ret_size;
 289
 290         return 1;
 291 }
 292
 293 int dt_xlate_reg(void *node, int res, unsigned long *addr, unsigned long *size)
 294 {
 295         int reglen;
 296
 297         reglen = getprop(node, "reg", dt_xlate_buf, sizeof(dt_xlate_buf)) / 4;
 298         return dt_xlate(node, res, reglen, addr, size);
 299 }
 300
 301 int dt_xlate_addr(void *node, u32 *buf, int buflen, unsigned long *xlated_addr)
 302 {
 303
 304         if (buflen > sizeof(dt_xlate_buf))
 305                 return 0;
 306
 307         memcpy(dt_xlate_buf, buf, buflen);
 308         return dt_xlate(node, 0, buflen / 4, xlated_addr, NULL);
 309 }