cpu/mcf547x_8x/start.S

   1 /*
   2  * Copyright (C) 2003   Josef Baumgartner <josef.baumgartner@telex.de>
   3  * Based on code from Bernhard Kuhn <bkuhn@metrowerks.com>
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24 #include <config.h>
  25 #include "version.h"
  26
  27 #ifndef  CONFIG_IDENT_STRING
  28 #define  CONFIG_IDENT_STRING ""
  29 #endif
  30
  31 /* last three long word reserved for cache status */
  32 #define ICACHE_STATUS   (CONFIG_SYS_INIT_RAM_ADDR+CONFIG_SYS_INIT_RAM_END- 4)
  33 #define DCACHE_STATUS   (CONFIG_SYS_INIT_RAM_ADDR+CONFIG_SYS_INIT_RAM_END- 8)
  34 #define CACR_STATUS     (CONFIG_SYS_INIT_RAM_ADDR+CONFIG_SYS_INIT_RAM_END-12)
  35
  36 #define _START  _start
  37 #define _FAULT  _fault
  38
  39 #define SAVE_ALL                                                \
  40         move.w  #0x2700,%sr;            /* disable intrs */     \
  41         subl    #60,%sp;                /* space for 15 regs */ \
  42         moveml  %d0-%d7/%a0-%a6,%sp@;
  43
  44 #define RESTORE_ALL                                             \
  45         moveml  %sp@,%d0-%d7/%a0-%a6;                           \
  46         addl    #60,%sp;                /* space for 15 regs */ \
  47         rte;
  48
  49 .text
  50 /*
  51  *      Vector table. This is used for initial platform startup.
  52  *      These vectors are to catch any un-intended traps.
  53  */
  54 _vectors:
  55
  56 INITSP:         .long   0x00000000      /* Initial SP   */
  57 INITPC:         .long   _START  /* Initial PC           */
  58 vector02:       .long   _FAULT  /* Access Error         */
  59 vector03:       .long   _FAULT  /* Address Error        */
  60 vector04:       .long   _FAULT  /* Illegal Instruction  */
  61 vector05:       .long   _FAULT  /* Reserved             */
  62 vector06:       .long   _FAULT  /* Reserved             */
  63 vector07:       .long   _FAULT  /* Reserved             */
  64 vector08:       .long   _FAULT  /* Privilege Violation  */
  65 vector09:       .long   _FAULT  /* Trace                */
  66 vector0A:       .long   _FAULT  /* Unimplemented A-Line */
  67 vector0B:       .long   _FAULT  /* Unimplemented F-Line */
  68 vector0C:       .long   _FAULT  /* Debug Interrupt      */
  69 vector0D:       .long   _FAULT  /* Reserved             */
  70 vector0E:       .long   _FAULT  /* Format Error         */
  71 vector0F:       .long   _FAULT  /* Unitialized Int.     */
  72
  73 /* Reserved */
  74 vector10_17:
  75 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  76
  77 vector18:       .long   _FAULT  /* Spurious Interrupt   */
  78 vector19:       .long   _FAULT  /* Autovector Level 1   */
  79 vector1A:       .long   _FAULT  /* Autovector Level 2   */
  80 vector1B:       .long   _FAULT  /* Autovector Level 3   */
  81 vector1C:       .long   _FAULT  /* Autovector Level 4   */
  82 vector1D:       .long   _FAULT  /* Autovector Level 5   */
  83 vector1E:       .long   _FAULT  /* Autovector Level 6   */
  84 vector1F:       .long   _FAULT  /* Autovector Level 7   */
  85
  86 /* TRAP #0 - #15 */
  87 vector20_2F:
  88 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  89 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  90
  91 /* Reserved     */
  92 vector30_3F:
  93 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  94 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  95
  96 vector64_127:
  97 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  98 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  99 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
 100 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
 101 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
 102 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
 103 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
 104 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
 105
 106 vector128_191:
 107 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
 108 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
 109 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
 110 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
 111 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
 112 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
 113 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
 114 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
 115
 116 vector192_255:
 117 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
 118 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
 119 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
 120 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
 121 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
 122 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
 123 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
 124 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
 125
 126         .text
 127
 128         .globl  _start
 129 _start:
 130         nop
 131         nop
 132         move.w #0x2700,%sr              /* Mask off Interrupt */
 133
 134         /* Set vector base register at the beginning of the Flash */
 135         move.l  #CONFIG_SYS_FLASH_BASE, %d0
 136         movec   %d0, %VBR
 137
 138         move.l  #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_CTRL), %d0
 139         movec   %d0, %RAMBAR0
 140
 141         move.l  #(CONFIG_SYS_INIT_RAM1_ADDR + CONFIG_SYS_INIT_RAM1_CTRL), %d0
 142         movec   %d0, %RAMBAR1
 143
 144         move.l  #CONFIG_SYS_MBAR, %d0           /* set MBAR address */
 145         move.c  %d0, %MBAR
 146
 147         /* invalidate and disable cache */
 148         move.l  #0x01040100, %d0        /* Invalidate cache cmd */
 149         movec   %d0, %CACR              /* Invalidate cache */
 150         move.l  #0, %d0
 151         movec   %d0, %ACR0
 152         movec   %d0, %ACR1
 153         movec   %d0, %ACR2
 154         movec   %d0, %ACR3
 155
 156         /* initialize general use internal ram */
 157         move.l #0, %d0
 158         move.l #(ICACHE_STATUS), %a1    /* icache */
 159         move.l #(DCACHE_STATUS), %a2    /* icache */
 160         move.l #(CACR_STATUS), %a3      /* CACR */
 161         move.l %d0, (%a1)
 162         move.l %d0, (%a2)
 163         move.l %d0, (%a3)
 164
 165         /* set stackpointer to end of internal ram to get some stackspace for the
 166            first c-code */
 167         move.l  #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_SP_OFFSET), %sp
 168         clr.l %sp@-
 169
 170         move.l #__got_start, %a5        /* put relocation table address to a5 */
 171
 172         bsr cpu_init_f                  /* run low-level CPU init code (from flash) */
 173         bsr board_init_f                /* run low-level board init code (from flash) */
 174
 175         /* board_init_f() does not return */
 176
 177 /*------------------------------------------------------------------------------*/
 178
 179 /*
 180  * void relocate_code (addr_sp, gd, addr_moni)
 181  *
 182  * This "function" does not return, instead it continues in RAM
 183  * after relocating the monitor code.
 184  *
 185  * r3 = dest
 186  * r4 = src
 187  * r5 = length in bytes
 188  * r6 = cachelinesize
 189  */
 190         .globl  relocate_code
 191 relocate_code:
 192         link.w %a6,#0
 193         move.l 8(%a6), %sp              /* set new stack pointer */
 194
 195         move.l 12(%a6), %d0             /* Save copy of Global Data pointer */
 196         move.l 16(%a6), %a0             /* Save copy of Destination Address */
 197
 198         move.l #CONFIG_SYS_MONITOR_BASE, %a1
 199         move.l #__init_end, %a2
 200         move.l %a0, %a3
 201
 202         /* copy the code to RAM */
 203 1:
 204         move.l (%a1)+, (%a3)+
 205         cmp.l  %a1,%a2
 206         bgt.s    1b
 207
 208 /*
 209  * We are done. Do not return, instead branch to second part of board
 210  * initialization, now running from RAM.
 211  */
 212         move.l  %a0, %a1
 213         add.l   #(in_ram - CONFIG_SYS_MONITOR_BASE), %a1
 214         jmp     (%a1)
 215
 216 in_ram:
 217
 218 clear_bss:
 219         /*
 220          * Now clear BSS segment
 221          */
 222         move.l  %a0, %a1
 223         add.l   #(_sbss - CONFIG_SYS_MONITOR_BASE),%a1
 224         move.l  %a0, %d1
 225         add.l   #(_ebss - CONFIG_SYS_MONITOR_BASE),%d1
 226 6:
 227         clr.l   (%a1)+
 228         cmp.l   %a1,%d1
 229         bgt.s   6b
 230
 231         /*
 232          * fix got table in RAM
 233          */
 234         move.l  %a0, %a1
 235         add.l   #(__got_start - CONFIG_SYS_MONITOR_BASE),%a1
 236         move.l  %a1,%a5         /* * fix got pointer register a5 */
 237
 238         move.l  %a0, %a2
 239         add.l   #(__got_end - CONFIG_SYS_MONITOR_BASE),%a2
 240
 241 7:
 242         move.l  (%a1),%d1
 243         sub.l   #_start,%d1
 244         add.l   %a0,%d1
 245         move.l  %d1,(%a1)+
 246         cmp.l   %a2, %a1
 247         bne     7b
 248
 249         /* calculate relative jump to board_init_r in ram */
 250         move.l %a0, %a1
 251         add.l #(board_init_r - CONFIG_SYS_MONITOR_BASE), %a1
 252
 253         /* set parameters for board_init_r */
 254         move.l %a0,-(%sp)               /* dest_addr */
 255         move.l %d0,-(%sp)               /* gd */
 256         jsr     (%a1)
 257
 258 /*------------------------------------------------------------------------------*/
 259 /* exception code */
 260         .globl _fault
 261 _fault:
 262         bra _fault
 263         .globl  _exc_handler
 264
 265 _exc_handler:
 266         SAVE_ALL
 267         movel   %sp,%sp@-
 268         bsr exc_handler
 269         addql   #4,%sp
 270         RESTORE_ALL
 271
 272         .globl  _int_handler
 273 _int_handler:
 274         SAVE_ALL
 275         movel   %sp,%sp@-
 276         bsr int_handler
 277         addql   #4,%sp
 278         RESTORE_ALL
 279
 280 /*------------------------------------------------------------------------------*/
 281 /* cache functions */
 282         .globl  icache_enable
 283 icache_enable:
 284         move.l  #(CONFIG_SYS_SDRAM_BASE + 0x1c000), %d0
 285         movec   %d0, %ACR2                      /* Enable cache */
 286
 287         move.l  #0x020C8100, %d0                /* Setup cache mask */
 288         movec   %d0, %CACR                      /* Enable cache */
 289         nop
 290
 291         move.l #(ICACHE_STATUS), %a1
 292         moveq   #1, %d0
 293         move.l  %d0, (%a1)
 294         rts
 295
 296         .globl  icache_disable
 297 icache_disable:
 298         move.l  #0x000C8100, %d0                /* Setup cache mask */
 299         movec   %d0, %CACR                      /* Disable cache */
 300         clr.l   %d0                             /* Setup cache mask */
 301         movec   %d0, %ACR2
 302         movec   %d0, %ACR3
 303
 304         move.l #(ICACHE_STATUS), %a1
 305         moveq   #0, %d0
 306         move.l  %d0, (%a1)
 307         rts
 308
 309         .globl  icache_invalid
 310 icache_invalid:
 311         move.l  #0x000C8100, %d0                /* Setup cache mask */
 312         movec   %d0, %CACR                      /* Enable cache */
 313         rts
 314
 315         .globl  icache_status
 316 icache_status:
 317         move.l #(ICACHE_STATUS), %a1
 318         move.l  (%a1), %d0
 319         rts
 320
 321         .globl  dcache_enable
 322 dcache_enable:
 323         bsr     icache_disable
 324
 325         move.l  #(CONFIG_SYS_SDRAM_BASE + 0xc000), %d0
 326         movec   %d0, %ACR0                      /* Enable cache */
 327
 328         move.l  #0xA30C8100, %d0                /* Invalidate cache cmd */
 329         movec   %d0, %CACR                      /* Invalidate cache */
 330
 331         move.l #(DCACHE_STATUS), %a1
 332         moveq   #1, %d0
 333         move.l  %d0, (%a1)
 334         rts
 335
 336         .globl  dcache_disable
 337 dcache_disable:
 338         move.l  #0xA30C8100, %d0                /* Setup cache mask */
 339         movec   %d0, %CACR                      /* Disable cache */
 340         clr.l   %d0                             /* Setup cache mask */
 341         movec   %d0, %ACR0
 342         movec   %d0, %ACR1
 343
 344         move.l #(DCACHE_STATUS), %a1
 345         moveq   #0, %d0
 346         move.l  %d0, (%a1)
 347         rts
 348
 349         .globl  dcache_status
 350 dcache_status:
 351         move.l #(DCACHE_STATUS), %a1
 352         move.l  (%a1), %d0
 353         rts
 354
 355 /*------------------------------------------------------------------------------*/
 356
 357         .globl  version_string
 358 version_string:
 359         .ascii U_BOOT_VERSION
 360         .ascii " (", __DATE__, " - ", __TIME__, ")"
 361         .ascii CONFIG_IDENT_STRING, "\0"
 362         .align 4