lib_ppc/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 <zlib.h>
  33 #include <bzlib.h>
  34 #include <environment.h>
  35 #include <asm/byteorder.h>
  36
  37 #if defined(CONFIG_OF_LIBFDT)
  38 #include <fdt.h>
  39 #include <libfdt.h>
  40 #include <fdt_support.h>
  41
  42 #endif
  43
  44 #ifdef CONFIG_SYS_INIT_RAM_LOCK
  45 #include <asm/cache.h>
  46 #endif
  47
  48 DECLARE_GLOBAL_DATA_PTR;
  49
  50 extern ulong get_effective_memsize(void);
  51 static ulong get_sp (void);
  52 static void set_clocks_in_mhz (bd_t *kbd);
  53
  54 #ifndef CONFIG_SYS_LINUX_LOWMEM_MAX_SIZE
  55 #define CONFIG_SYS_LINUX_LOWMEM_MAX_SIZE        (768*1024*1024)
  56 #endif
  57
  58 __attribute__((noinline))
  59 int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images)
  60 {
  61         ulong   sp;
  62
  63         ulong   initrd_start, initrd_end;
  64         ulong   rd_len;
  65         ulong   size;
  66         phys_size_t bootm_size;
  67
  68         ulong   cmd_start, cmd_end, bootmap_base;
  69         bd_t    *kbd;
  70         void    (*kernel)(bd_t *, ulong r4, ulong r5, ulong r6,
  71                           ulong r7, ulong r8, ulong r9);
  72         int     ret;
  73         ulong   of_size = images->ft_len;
  74         struct lmb *lmb = &images->lmb;
  75
  76 #if defined(CONFIG_OF_LIBFDT)
  77         char    *of_flat_tree = images->ft_addr;
  78 #endif
  79
  80         kernel = (void (*)(bd_t *, ulong, ulong, ulong,
  81                            ulong, ulong, ulong))images->ep;
  82
  83         bootmap_base = getenv_bootm_low();
  84         bootm_size = getenv_bootm_size();
  85
  86 #ifdef DEBUG
  87         if (((u64)bootmap_base + bootm_size) >
  88             (CONFIG_SYS_SDRAM_BASE + (u64)gd->ram_size))
  89                 puts("WARNING: bootm_low + bootm_size exceed total memory\n");
  90         if ((bootmap_base + bootm_size) > get_effective_memsize())
  91                 puts("WARNING: bootm_low + bootm_size exceed eff. memory\n");
  92 #endif
  93
  94         size = min(bootm_size, get_effective_memsize());
  95         size = min(size, CONFIG_SYS_LINUX_LOWMEM_MAX_SIZE);
  96
  97         if (size < bootm_size) {
  98                 ulong base = bootmap_base + size;
  99                 printf("WARNING: adjusting available memory to %lx\n", size);
 100                 lmb_reserve(lmb, base, bootm_size - size);
 101         }
 102
 103         /*
 104          * Booting a (Linux) kernel image
 105          *
 106          * Allocate space for command line and board info - the
 107          * address should be as high as possible within the reach of
 108          * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused
 109          * memory, which means far enough below the current stack
 110          * pointer.
 111          */
 112         sp = get_sp();
 113         debug ("## Current stack ends at 0x%08lx\n", sp);
 114
 115         /* adjust sp by 1K to be safe */
 116         sp -= 1024;
 117         lmb_reserve(lmb, sp, (CONFIG_SYS_SDRAM_BASE + get_effective_memsize() - sp));
 118
 119         if (!of_size) {
 120                 /* allocate space and init command line */
 121                 ret = boot_get_cmdline (lmb, &cmd_start, &cmd_end, bootmap_base);
 122                 if (ret) {
 123                         puts("ERROR with allocation of cmdline\n");
 124                         goto error;
 125                 }
 126
 127                 /* allocate space for kernel copy of board info */
 128                 ret = boot_get_kbd (lmb, &kbd, bootmap_base);
 129                 if (ret) {
 130                         puts("ERROR with allocation of kernel bd\n");
 131                         goto error;
 132                 }
 133                 set_clocks_in_mhz(kbd);
 134         }
 135
 136         rd_len = images->rd_end - images->rd_start;
 137
 138 #if defined(CONFIG_OF_LIBFDT)
 139         ret = boot_relocate_fdt(lmb, bootmap_base, &of_flat_tree, &of_size);
 140         if (ret)
 141                 goto error;
 142
 143         /*
 144          * Add the chosen node if it doesn't exist, add the env and bd_t
 145          * if the user wants it (the logic is in the subroutines).
 146          */
 147         if (of_size) {
 148                 if (fdt_chosen(of_flat_tree, 1) < 0) {
 149                         puts ("ERROR: ");
 150                         puts ("/chosen node create failed");
 151                         puts (" - must RESET the board to recover.\n");
 152                         goto error;
 153                 }
 154 #ifdef CONFIG_OF_BOARD_SETUP
 155                 /* Call the board-specific fixup routine */
 156                 ft_board_setup(of_flat_tree, gd->bd);
 157 #endif
 158         }
 159
 160         /* Fixup the fdt memreserve now that we know how big it is */
 161         if (of_flat_tree) {
 162                 /* Delete the old LMB reservation */
 163                 lmb_free(lmb, (phys_addr_t)(u32)of_flat_tree,
 164                                 (phys_size_t)fdt_totalsize(of_flat_tree));
 165
 166                 ret = fdt_resize(of_flat_tree);
 167                 if (ret < 0)
 168                         goto error;
 169                 of_size = ret;
 170
 171                 if ((of_flat_tree) && (initrd_start && initrd_end))
 172                         of_size += FDT_RAMDISK_OVERHEAD;
 173                 /* Create a new LMB reservation */
 174                 lmb_reserve(lmb, (ulong)of_flat_tree, of_size);
 175         }
 176 #endif  /* CONFIG_OF_LIBFDT */
 177
 178         ret = boot_ramdisk_high (lmb, images->rd_start, rd_len, &initrd_start, &initrd_end);
 179         if (ret)
 180                 goto error;
 181
 182 #if defined(CONFIG_OF_LIBFDT)
 183         /* fixup the initrd now that we know where it should be */
 184         if ((of_flat_tree) && (initrd_start && initrd_end))
 185                 fdt_initrd(of_flat_tree, initrd_start, initrd_end, 1);
 186 #endif
 187         debug ("## Transferring control to Linux (at address %08lx) ...\n",
 188                 (ulong)kernel);
 189
 190         show_boot_progress (15);
 191
 192 #if defined(CONFIG_SYS_INIT_RAM_LOCK) && !defined(CONFIG_E500)
 193         unlock_ram_in_cache();
 194 #endif
 195
 196 #if defined(CONFIG_OF_LIBFDT)
 197         if (of_flat_tree) {     /* device tree; boot new style */
 198                 /*
 199                  * Linux Kernel Parameters (passing device tree):
 200                  *   r3: pointer to the fdt
 201                  *   r4: 0
 202                  *   r5: 0
 203                  *   r6: epapr magic
 204                  *   r7: size of IMA in bytes
 205                  *   r8: 0
 206                  *   r9: 0
 207                  */
 208 #if defined(CONFIG_85xx) || defined(CONFIG_440)
 209  #define EPAPR_MAGIC    (0x45504150)
 210 #else
 211  #define EPAPR_MAGIC    (0x65504150)
 212 #endif
 213
 214                 debug ("   Booting using OF flat tree...\n");
 215                 (*kernel) ((bd_t *)of_flat_tree, 0, 0, EPAPR_MAGIC,
 216                            CONFIG_SYS_BOOTMAPSZ, 0, 0);
 217                 /* does not return */
 218         } else
 219 #endif
 220         {
 221                 /*
 222                  * Linux Kernel Parameters (passing board info data):
 223                  *   r3: ptr to board info data
 224                  *   r4: initrd_start or 0 if no initrd
 225                  *   r5: initrd_end - unused if r4 is 0
 226                  *   r6: Start of command line string
 227                  *   r7: End   of command line string
 228                  *   r8: 0
 229                  *   r9: 0
 230                  */
 231                 debug ("   Booting using board info...\n");
 232                 (*kernel) (kbd, initrd_start, initrd_end,
 233                            cmd_start, cmd_end, 0, 0);
 234                 /* does not return */
 235         }
 236         return 1;
 237
 238 error:
 239         return 1;
 240 }
 241
 242 static ulong get_sp (void)
 243 {
 244         ulong sp;
 245
 246         asm( "mr %0,1": "=r"(sp) : );
 247         return sp;
 248 }
 249
 250 static void set_clocks_in_mhz (bd_t *kbd)
 251 {
 252         char    *s;
 253
 254         if ((s = getenv ("clocks_in_mhz")) != NULL) {
 255                 /* convert all clock information to MHz */
 256                 kbd->bi_intfreq /= 1000000L;
 257                 kbd->bi_busfreq /= 1000000L;
 258 #if defined(CONFIG_MPC8220)
 259                 kbd->bi_inpfreq /= 1000000L;
 260                 kbd->bi_pcifreq /= 1000000L;
 261                 kbd->bi_pevfreq /= 1000000L;
 262                 kbd->bi_flbfreq /= 1000000L;
 263                 kbd->bi_vcofreq /= 1000000L;
 264 #endif
 265 #if defined(CONFIG_CPM2)
 266                 kbd->bi_cpmfreq /= 1000000L;
 267                 kbd->bi_brgfreq /= 1000000L;
 268                 kbd->bi_sccfreq /= 1000000L;
 269                 kbd->bi_vco     /= 1000000L;
 270 #endif
 271 #if defined(CONFIG_MPC5xxx)
 272                 kbd->bi_ipbfreq /= 1000000L;
 273                 kbd->bi_pcifreq /= 1000000L;
 274 #endif /* CONFIG_MPC5xxx */
 275         }
 276 }