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         bootstage_mark(BOOTSTAGE_ID_RUN_OS);
  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                 debug ("   Booting using OF flat tree...\n");
  91                 WATCHDOG_RESET ();
  92                 (*kernel) ((bd_t *)of_flat_tree, 0, 0, EPAPR_MAGIC,
  93                            getenv_bootm_mapsize(), 0, 0);
  94                 /* does not return */
  95         } else
  96 #endif
  97         {
  98                 /*
  99                  * Linux Kernel Parameters (passing board info data):
 100                  *   r3: ptr to board info data
 101                  *   r4: initrd_start or 0 if no initrd
 102                  *   r5: initrd_end - unused if r4 is 0
 103                  *   r6: Start of command line string
 104                  *   r7: End   of command line string
 105                  *   r8: 0
 106                  *   r9: 0
 107                  */
 108                 ulong cmd_start = images->cmdline_start;
 109                 ulong cmd_end = images->cmdline_end;
 110                 ulong initrd_start = images->initrd_start;
 111                 ulong initrd_end = images->initrd_end;
 112                 bd_t *kbd = images->kbd;
 113
 114                 debug ("   Booting using board info...\n");
 115                 WATCHDOG_RESET ();
 116                 (*kernel) (kbd, initrd_start, initrd_end,
 117                            cmd_start, cmd_end, 0, 0);
 118                 /* does not return */
 119         }
 120         return ;
 121 }
 122
 123 void arch_lmb_reserve(struct lmb *lmb)
 124 {
 125         phys_size_t bootm_size;
 126         ulong size, sp, bootmap_base;
 127
 128         bootmap_base = getenv_bootm_low();
 129         bootm_size = getenv_bootm_size();
 130
 131 #ifdef DEBUG
 132         if (((u64)bootmap_base + bootm_size) >
 133             (CONFIG_SYS_SDRAM_BASE + (u64)gd->ram_size))
 134                 puts("WARNING: bootm_low + bootm_size exceed total memory\n");
 135         if ((bootmap_base + bootm_size) > get_effective_memsize())
 136                 puts("WARNING: bootm_low + bootm_size exceed eff. memory\n");
 137 #endif
 138
 139         size = min(bootm_size, get_effective_memsize());
 140         size = min(size, CONFIG_SYS_LINUX_LOWMEM_MAX_SIZE);
 141
 142         if (size < bootm_size) {
 143                 ulong base = bootmap_base + size;
 144                 printf("WARNING: adjusting available memory to %lx\n", size);
 145                 lmb_reserve(lmb, base, bootm_size - size);
 146         }
 147
 148         /*
 149          * Booting a (Linux) kernel image
 150          *
 151          * Allocate space for command line and board info - the
 152          * address should be as high as possible within the reach of
 153          * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused
 154          * memory, which means far enough below the current stack
 155          * pointer.
 156          */
 157         sp = get_sp();
 158         debug ("## Current stack ends at 0x%08lx\n", sp);
 159
 160         /* adjust sp by 4K to be safe */
 161         sp -= 4096;
 162         lmb_reserve(lmb, sp, (CONFIG_SYS_SDRAM_BASE + get_effective_memsize() - sp));
 163
 164 #ifdef CONFIG_MP
 165         cpu_mp_lmb_reserve(lmb);
 166 #endif
 167
 168         return ;
 169 }
 170
 171 static void boot_prep_linux(bootm_headers_t *images)
 172 {
 173 #ifdef CONFIG_MP
 174         /*
 175          * if we are MP make sure to flush the device tree so any changes are
 176          * made visibile to all other cores.  In AMP boot scenarios the cores
 177          * might not be HW cache coherent with each other.
 178          */
 179         flush_cache((unsigned long)images->ft_addr, images->ft_len);
 180 #endif
 181 }
 182
 183 static int boot_cmdline_linux(bootm_headers_t *images)
 184 {
 185         ulong of_size = images->ft_len;
 186         struct lmb *lmb = &images->lmb;
 187         ulong *cmd_start = &images->cmdline_start;
 188         ulong *cmd_end = &images->cmdline_end;
 189
 190         int ret = 0;
 191
 192         if (!of_size) {
 193                 /* allocate space and init command line */
 194                 ret = boot_get_cmdline (lmb, cmd_start, cmd_end);
 195                 if (ret) {
 196                         puts("ERROR with allocation of cmdline\n");
 197                         return ret;
 198                 }
 199         }
 200
 201         return ret;
 202 }
 203
 204 static int boot_bd_t_linux(bootm_headers_t *images)
 205 {
 206         ulong of_size = images->ft_len;
 207         struct lmb *lmb = &images->lmb;
 208         bd_t **kbd = &images->kbd;
 209
 210         int ret = 0;
 211
 212         if (!of_size) {
 213                 /* allocate space for kernel copy of board info */
 214                 ret = boot_get_kbd (lmb, kbd);
 215                 if (ret) {
 216                         puts("ERROR with allocation of kernel bd\n");
 217                         return ret;
 218                 }
 219                 set_clocks_in_mhz(*kbd);
 220         }
 221
 222         return ret;
 223 }
 224
 225 /*
 226  * Verify the device tree.
 227  *
 228  * This function is called after all device tree fix-ups have been enacted,
 229  * so that the final device tree can be verified.  The definition of "verified"
 230  * is up to the specific implementation.  However, it generally means that the
 231  * addresses of some of the devices in the device tree are compared with the
 232  * actual addresses at which U-Boot has placed them.
 233  *
 234  * Returns 1 on success, 0 on failure.  If 0 is returned, U-boot will halt the
 235  * boot process.
 236  */
 237 static int __ft_verify_fdt(void *fdt)
 238 {
 239         return 1;
 240 }
 241 __attribute__((weak, alias("__ft_verify_fdt"))) int ft_verify_fdt(void *fdt);
 242
 243 static int boot_body_linux(bootm_headers_t *images)
 244 {
 245         ulong rd_len;
 246         struct lmb *lmb = &images->lmb;
 247         ulong *initrd_start = &images->initrd_start;
 248         ulong *initrd_end = &images->initrd_end;
 249 #if defined(CONFIG_OF_LIBFDT)
 250         ulong of_size = images->ft_len;
 251         char **of_flat_tree = &images->ft_addr;
 252 #endif
 253
 254         int ret;
 255
 256 #if defined(CONFIG_OF_LIBFDT)
 257         boot_fdt_add_mem_rsv_regions(lmb, *of_flat_tree);
 258 #endif
 259
 260         /* allocate space and init command line */
 261         ret = boot_cmdline_linux(images);
 262         if (ret)
 263                 return ret;
 264
 265         /* allocate space for kernel copy of board info */
 266         ret = boot_bd_t_linux(images);
 267         if (ret)
 268                 return ret;
 269
 270         rd_len = images->rd_end - images->rd_start;
 271         ret = boot_ramdisk_high (lmb, images->rd_start, rd_len, initrd_start, initrd_end);
 272         if (ret)
 273                 return ret;
 274
 275 #if defined(CONFIG_OF_LIBFDT)
 276         ret = boot_relocate_fdt(lmb, of_flat_tree, &of_size);
 277         if (ret)
 278                 return ret;
 279
 280         /*
 281          * Add the chosen node if it doesn't exist, add the env and bd_t
 282          * if the user wants it (the logic is in the subroutines).
 283          */
 284         if (of_size) {
 285                 if (fdt_chosen(*of_flat_tree, 1) < 0) {
 286                         puts ("ERROR: ");
 287                         puts ("/chosen node create failed");
 288                         puts (" - must RESET the board to recover.\n");
 289                         return -1;
 290                 }
 291 #ifdef CONFIG_OF_BOARD_SETUP
 292                 /* Call the board-specific fixup routine */
 293                 ft_board_setup(*of_flat_tree, gd->bd);
 294 #endif
 295
 296                 /* Delete the old LMB reservation */
 297                 lmb_free(lmb, (phys_addr_t)(u32)*of_flat_tree,
 298                                 (phys_size_t)fdt_totalsize(*of_flat_tree));
 299
 300                 ret = fdt_resize(*of_flat_tree);
 301                 if (ret < 0)
 302                         return ret;
 303                 of_size = ret;
 304
 305                 if (*initrd_start && *initrd_end) {
 306                         of_size += FDT_RAMDISK_OVERHEAD;
 307                         fdt_set_totalsize(*of_flat_tree, of_size);
 308                 }
 309                 /* Create a new LMB reservation */
 310                 lmb_reserve(lmb, (ulong)*of_flat_tree, of_size);
 311
 312                 /* fixup the initrd now that we know where it should be */
 313                 if (*initrd_start && *initrd_end)
 314                         fdt_initrd(*of_flat_tree, *initrd_start, *initrd_end, 1);
 315
 316                 if (!ft_verify_fdt(*of_flat_tree))
 317                         return -1;
 318         }
 319 #endif  /* CONFIG_OF_LIBFDT */
 320         return 0;
 321 }
 322
 323 noinline
 324 int do_bootm_linux(int flag, int argc, char * const argv[], bootm_headers_t *images)
 325 {
 326         int     ret;
 327
 328         if (flag & BOOTM_STATE_OS_CMDLINE) {
 329                 boot_cmdline_linux(images);
 330                 return 0;
 331         }
 332
 333         if (flag & BOOTM_STATE_OS_BD_T) {
 334                 boot_bd_t_linux(images);
 335                 return 0;
 336         }
 337
 338         if (flag & BOOTM_STATE_OS_PREP) {
 339                 boot_prep_linux(images);
 340                 return 0;
 341         }
 342
 343         if (flag & BOOTM_STATE_OS_GO) {
 344                 boot_jump_linux(images);
 345                 return 0;
 346         }
 347
 348         boot_prep_linux(images);
 349         ret = boot_body_linux(images);
 350         if (ret)
 351                 return ret;
 352         boot_jump_linux(images);
 353
 354         return 0;
 355 }
 356
 357 static ulong get_sp (void)
 358 {
 359         ulong sp;
 360
 361         asm( "mr %0,1": "=r"(sp) : );
 362         return sp;
 363 }
 364
 365 static void set_clocks_in_mhz (bd_t *kbd)
 366 {
 367         char    *s;
 368
 369         if ((s = getenv ("clocks_in_mhz")) != NULL) {
 370                 /* convert all clock information to MHz */
 371                 kbd->bi_intfreq /= 1000000L;
 372                 kbd->bi_busfreq /= 1000000L;
 373 #if defined(CONFIG_MPC8220)
 374                 kbd->bi_inpfreq /= 1000000L;
 375                 kbd->bi_pcifreq /= 1000000L;
 376                 kbd->bi_pevfreq /= 1000000L;
 377                 kbd->bi_flbfreq /= 1000000L;
 378                 kbd->bi_vcofreq /= 1000000L;
 379 #endif
 380 #if defined(CONFIG_CPM2)
 381                 kbd->bi_cpmfreq /= 1000000L;
 382                 kbd->bi_brgfreq /= 1000000L;
 383                 kbd->bi_sccfreq /= 1000000L;
 384                 kbd->bi_vco     /= 1000000L;
 385 #endif
 386 #if defined(CONFIG_MPC5xxx)
 387                 kbd->bi_ipbfreq /= 1000000L;
 388                 kbd->bi_pcifreq /= 1000000L;
 389 #endif /* CONFIG_MPC5xxx */
 390         }
 391 }