arch/powerpc/lib/bootm.c

   1 /*
   2  * (C) Copyright 2008 Semihalf
   3  *
   4  * (C) Copyright 2000-2006
   5  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   6  *
   7  * See file CREDITS for list of people who contributed to this
   8  * project.
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License as
  12  * published by the Free Software Foundation; either version 2 of
  13  * the License, or (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  23  * MA 02111-1307 USA
  24  */
  25
  26
  27 #include <common.h>
  28 #include <watchdog.h>
  29 #include <command.h>
  30 #include <image.h>
  31 #include <malloc.h>
  32 #include <u-boot/zlib.h>
  33 #include <bzlib.h>
  34 #include <environment.h>
  35 #include <asm/byteorder.h>
  36 #include <asm/mp.h>
  37
  38 #if defined(CONFIG_OF_LIBFDT)
  39 #include <fdt.h>
  40 #include <libfdt.h>
  41 #include <fdt_support.h>
  42
  43 #endif
  44
  45 #ifdef CONFIG_SYS_INIT_RAM_LOCK
  46 #include <asm/cache.h>
  47 #endif
  48
  49 DECLARE_GLOBAL_DATA_PTR;
  50
  51 extern ulong get_effective_memsize(void);
  52 static ulong get_sp (void);
  53 static void set_clocks_in_mhz (bd_t *kbd);
  54
  55 #ifndef CONFIG_SYS_LINUX_LOWMEM_MAX_SIZE
  56 #define CONFIG_SYS_LINUX_LOWMEM_MAX_SIZE        (768*1024*1024)
  57 #endif
  58
  59 static void boot_jump_linux(bootm_headers_t *images)
  60 {
  61         void    (*kernel)(bd_t *, ulong r4, ulong r5, ulong r6,
  62                           ulong r7, ulong r8, ulong r9);
  63 #ifdef CONFIG_OF_LIBFDT
  64         char *of_flat_tree = images->ft_addr;
  65 #endif
  66
  67         kernel = (void (*)(bd_t *, ulong, ulong, ulong,
  68                            ulong, ulong, ulong))images->ep;
  69         debug ("## Transferring control to Linux (at address %08lx) ...\n",
  70                 (ulong)kernel);
  71
  72         show_boot_progress (15);
  73
  74 #if defined(CONFIG_SYS_INIT_RAM_LOCK) && !defined(CONFIG_E500)
  75         unlock_ram_in_cache();
  76 #endif
  77
  78 #if defined(CONFIG_OF_LIBFDT)
  79         if (of_flat_tree) {     /* device tree; boot new style */
  80                 /*
  81                  * Linux Kernel Parameters (passing device tree):
  82                  *   r3: pointer to the fdt
  83                  *   r4: 0
  84                  *   r5: 0
  85                  *   r6: epapr magic
  86                  *   r7: size of IMA in bytes
  87                  *   r8: 0
  88                  *   r9: 0
  89                  */
  90 #if defined(CONFIG_MPC85xx) || defined(CONFIG_440)
  91  #define EPAPR_MAGIC    (0x45504150)
  92 #else
  93  #define EPAPR_MAGIC    (0x65504150)
  94 #endif
  95
  96                 debug ("   Booting using OF flat tree...\n");
  97                 WATCHDOG_RESET ();
  98                 (*kernel) ((bd_t *)of_flat_tree, 0, 0, EPAPR_MAGIC,
  99                            getenv_bootm_mapsize(), 0, 0);
 100                 /* does not return */
 101         } else
 102 #endif
 103         {
 104                 /*
 105                  * Linux Kernel Parameters (passing board info data):
 106                  *   r3: ptr to board info data
 107                  *   r4: initrd_start or 0 if no initrd
 108                  *   r5: initrd_end - unused if r4 is 0
 109                  *   r6: Start of command line string
 110                  *   r7: End   of command line string
 111                  *   r8: 0
 112                  *   r9: 0
 113                  */
 114                 ulong cmd_start = images->cmdline_start;
 115                 ulong cmd_end = images->cmdline_end;
 116                 ulong initrd_start = images->initrd_start;
 117                 ulong initrd_end = images->initrd_end;
 118                 bd_t *kbd = images->kbd;
 119
 120                 debug ("   Booting using board info...\n");
 121                 WATCHDOG_RESET ();
 122                 (*kernel) (kbd, initrd_start, initrd_end,
 123                            cmd_start, cmd_end, 0, 0);
 124                 /* does not return */
 125         }
 126         return ;
 127 }
 128
 129 void arch_lmb_reserve(struct lmb *lmb)
 130 {
 131         phys_size_t bootm_size;
 132         ulong size, sp, bootmap_base;
 133
 134         bootmap_base = getenv_bootm_low();
 135         bootm_size = getenv_bootm_size();
 136
 137 #ifdef DEBUG
 138         if (((u64)bootmap_base + bootm_size) >
 139             (CONFIG_SYS_SDRAM_BASE + (u64)gd->ram_size))
 140                 puts("WARNING: bootm_low + bootm_size exceed total memory\n");
 141         if ((bootmap_base + bootm_size) > get_effective_memsize())
 142                 puts("WARNING: bootm_low + bootm_size exceed eff. memory\n");
 143 #endif
 144
 145         size = min(bootm_size, get_effective_memsize());
 146         size = min(size, CONFIG_SYS_LINUX_LOWMEM_MAX_SIZE);
 147
 148         if (size < bootm_size) {
 149                 ulong base = bootmap_base + size;
 150                 printf("WARNING: adjusting available memory to %lx\n", size);
 151                 lmb_reserve(lmb, base, bootm_size - size);
 152         }
 153
 154         /*
 155          * Booting a (Linux) kernel image
 156          *
 157          * Allocate space for command line and board info - the
 158          * address should be as high as possible within the reach of
 159          * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused
 160          * memory, which means far enough below the current stack
 161          * pointer.
 162          */
 163         sp = get_sp();
 164         debug ("## Current stack ends at 0x%08lx\n", sp);
 165
 166         /* adjust sp by 4K to be safe */
 167         sp -= 4096;
 168         lmb_reserve(lmb, sp, (CONFIG_SYS_SDRAM_BASE + get_effective_memsize() - sp));
 169
 170 #ifdef CONFIG_MP
 171         cpu_mp_lmb_reserve(lmb);
 172 #endif
 173
 174         return ;
 175 }
 176
 177 static void boot_prep_linux(void)
 178 {
 179 #ifdef CONFIG_MP
 180         /* if we are MP make sure to flush the dcache() to any changes are made
 181          * visibile to all other cores */
 182         flush_dcache();
 183 #endif
 184         return ;
 185 }
 186
 187 static int boot_cmdline_linux(bootm_headers_t *images)
 188 {
 189         ulong of_size = images->ft_len;
 190         struct lmb *lmb = &images->lmb;
 191         ulong *cmd_start = &images->cmdline_start;
 192         ulong *cmd_end = &images->cmdline_end;
 193
 194         int ret = 0;
 195
 196         if (!of_size) {
 197                 /* allocate space and init command line */
 198                 ret = boot_get_cmdline (lmb, cmd_start, cmd_end);
 199                 if (ret) {
 200                         puts("ERROR with allocation of cmdline\n");
 201                         return ret;
 202                 }
 203         }
 204
 205         return ret;
 206 }
 207
 208 static int boot_bd_t_linux(bootm_headers_t *images)
 209 {
 210         ulong of_size = images->ft_len;
 211         struct lmb *lmb = &images->lmb;
 212         bd_t **kbd = &images->kbd;
 213
 214         int ret = 0;
 215
 216         if (!of_size) {
 217                 /* allocate space for kernel copy of board info */
 218                 ret = boot_get_kbd (lmb, kbd);
 219                 if (ret) {
 220                         puts("ERROR with allocation of kernel bd\n");
 221                         return ret;
 222                 }
 223                 set_clocks_in_mhz(*kbd);
 224         }
 225
 226         return ret;
 227 }
 228
 229 /*
 230  * Verify the device tree.
 231  *
 232  * This function is called after all device tree fix-ups have been enacted,
 233  * so that the final device tree can be verified.  The definition of "verified"
 234  * is up to the specific implementation.  However, it generally means that the
 235  * addresses of some of the devices in the device tree are compared with the
 236  * actual addresses at which U-Boot has placed them.
 237  *
 238  * Returns 1 on success, 0 on failure.  If 0 is returned, U-boot will halt the
 239  * boot process.
 240  */
 241 static int __ft_verify_fdt(void *fdt)
 242 {
 243         return 1;
 244 }
 245 __attribute__((weak, alias("__ft_verify_fdt"))) int ft_verify_fdt(void *fdt);
 246
 247 static int boot_body_linux(bootm_headers_t *images)
 248 {
 249         ulong rd_len;
 250         struct lmb *lmb = &images->lmb;
 251         ulong *initrd_start = &images->initrd_start;
 252         ulong *initrd_end = &images->initrd_end;
 253 #if defined(CONFIG_OF_LIBFDT)
 254         ulong of_size = images->ft_len;
 255         char **of_flat_tree = &images->ft_addr;
 256 #endif
 257
 258         int ret;
 259
 260 #if defined(CONFIG_OF_LIBFDT)
 261         boot_fdt_add_mem_rsv_regions(lmb, *of_flat_tree);
 262 #endif
 263
 264         /* allocate space and init command line */
 265         ret = boot_cmdline_linux(images);
 266         if (ret)
 267                 return ret;
 268
 269         /* allocate space for kernel copy of board info */
 270         ret = boot_bd_t_linux(images);
 271         if (ret)
 272                 return ret;
 273
 274         rd_len = images->rd_end - images->rd_start;
 275         ret = boot_ramdisk_high (lmb, images->rd_start, rd_len, initrd_start, initrd_end);
 276         if (ret)
 277                 return ret;
 278
 279 #if defined(CONFIG_OF_LIBFDT)
 280         ret = boot_relocate_fdt(lmb, of_flat_tree, &of_size);
 281         if (ret)
 282                 return ret;
 283
 284         /*
 285          * Add the chosen node if it doesn't exist, add the env and bd_t
 286          * if the user wants it (the logic is in the subroutines).
 287          */
 288         if (of_size) {
 289                 if (fdt_chosen(*of_flat_tree, 1) < 0) {
 290                         puts ("ERROR: ");
 291                         puts ("/chosen node create failed");
 292                         puts (" - must RESET the board to recover.\n");
 293                         return -1;
 294                 }
 295 #ifdef CONFIG_OF_BOARD_SETUP
 296                 /* Call the board-specific fixup routine */
 297                 ft_board_setup(*of_flat_tree, gd->bd);
 298 #endif
 299
 300                 /* Delete the old LMB reservation */
 301                 lmb_free(lmb, (phys_addr_t)(u32)*of_flat_tree,
 302                                 (phys_size_t)fdt_totalsize(*of_flat_tree));
 303
 304                 ret = fdt_resize(*of_flat_tree);
 305                 if (ret < 0)
 306                         return ret;
 307                 of_size = ret;
 308
 309                 if (*initrd_start && *initrd_end) {
 310                         of_size += FDT_RAMDISK_OVERHEAD;
 311                         fdt_set_totalsize(*of_flat_tree, of_size);
 312                 }
 313                 /* Create a new LMB reservation */
 314                 lmb_reserve(lmb, (ulong)*of_flat_tree, of_size);
 315
 316                 /* fixup the initrd now that we know where it should be */
 317                 if (*initrd_start && *initrd_end)
 318                         fdt_initrd(*of_flat_tree, *initrd_start, *initrd_end, 1);
 319
 320                 if (!ft_verify_fdt(*of_flat_tree))
 321                         return -1;
 322         }
 323 #endif  /* CONFIG_OF_LIBFDT */
 324         return 0;
 325 }
 326
 327 __attribute__((noinline))
 328 int do_bootm_linux(int flag, int argc, char * const argv[], bootm_headers_t *images)
 329 {
 330         int     ret;
 331
 332         if (flag & BOOTM_STATE_OS_CMDLINE) {
 333                 boot_cmdline_linux(images);
 334                 return 0;
 335         }
 336
 337         if (flag & BOOTM_STATE_OS_BD_T) {
 338                 boot_bd_t_linux(images);
 339                 return 0;
 340         }
 341
 342         if (flag & BOOTM_STATE_OS_PREP) {
 343                 boot_prep_linux();
 344                 return 0;
 345         }
 346
 347         if (flag & BOOTM_STATE_OS_GO) {
 348                 boot_jump_linux(images);
 349                 return 0;
 350         }
 351
 352         boot_prep_linux();
 353         ret = boot_body_linux(images);
 354         if (ret)
 355                 return ret;
 356         boot_jump_linux(images);
 357
 358         return 0;
 359 }
 360
 361 static ulong get_sp (void)
 362 {
 363         ulong sp;
 364
 365         asm( "mr %0,1": "=r"(sp) : );
 366         return sp;
 367 }
 368
 369 static void set_clocks_in_mhz (bd_t *kbd)
 370 {
 371         char    *s;
 372
 373         if ((s = getenv ("clocks_in_mhz")) != NULL) {
 374                 /* convert all clock information to MHz */
 375                 kbd->bi_intfreq /= 1000000L;
 376                 kbd->bi_busfreq /= 1000000L;
 377 #if defined(CONFIG_MPC8220)
 378                 kbd->bi_inpfreq /= 1000000L;
 379                 kbd->bi_pcifreq /= 1000000L;
 380                 kbd->bi_pevfreq /= 1000000L;
 381                 kbd->bi_flbfreq /= 1000000L;
 382                 kbd->bi_vcofreq /= 1000000L;
 383 #endif
 384 #if defined(CONFIG_CPM2)
 385                 kbd->bi_cpmfreq /= 1000000L;
 386                 kbd->bi_brgfreq /= 1000000L;
 387                 kbd->bi_sccfreq /= 1000000L;
 388                 kbd->bi_vco     /= 1000000L;
 389 #endif
 390 #if defined(CONFIG_MPC5xxx)
 391                 kbd->bi_ipbfreq /= 1000000L;
 392                 kbd->bi_pcifreq /= 1000000L;
 393 #endif /* CONFIG_MPC5xxx */
 394         }
 395 }