LXR uboot/arch/m68k/cpu/mcf547x

   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 <timestamp.h>
  26#include "version.h"
  27#include <asm/cache.h>
  28
  29#ifndef  CONFIG_IDENT_STRING
  30#define  CONFIG_IDENT_STRING ""
  31#endif
  32
  33#define _START  _start
  34#define _FAULT  _fault
  35
  36#define SAVE_ALL                                                \
  37        move.w  #0x2700,%sr;            /* disable intrs */     \
  38        subl    #60,%sp;                /* space for 15 regs */ \
  39        moveml  %d0-%d7/%a0-%a6,%sp@;
  40
  41#define RESTORE_ALL                                             \
  42        moveml  %sp@,%d0-%d7/%a0-%a6;                           \
  43        addl    #60,%sp;                /* space for 15 regs */ \
  44        rte;
  45
  46.text
  47/*
  48 *      Vector table. This is used for initial platform startup.
  49 *      These vectors are to catch any un-intended traps.
  50 */
  51_vectors:
  52
  53INITSP:         .long   0x00000000      /* Initial SP   */
  54INITPC:         .long   _START  /* Initial PC           */
  55vector02:       .long   _FAULT  /* Access Error         */
  56vector03:       .long   _FAULT  /* Address Error        */
  57vector04:       .long   _FAULT  /* Illegal Instruction  */
  58vector05:       .long   _FAULT  /* Reserved             */
  59vector06:       .long   _FAULT  /* Reserved             */
  60vector07:       .long   _FAULT  /* Reserved             */
  61vector08:       .long   _FAULT  /* Privilege Violation  */
  62vector09:       .long   _FAULT  /* Trace                */
  63vector0A:       .long   _FAULT  /* Unimplemented A-Line */
  64vector0B:       .long   _FAULT  /* Unimplemented F-Line */
  65vector0C:       .long   _FAULT  /* Debug Interrupt      */
  66vector0D:       .long   _FAULT  /* Reserved             */
  67vector0E:       .long   _FAULT  /* Format Error         */
  68vector0F:       .long   _FAULT  /* Unitialized Int.     */
  69
  70/* Reserved */
  71vector10_17:
  72.long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  73
  74vector18:       .long   _FAULT  /* Spurious Interrupt   */
  75vector19:       .long   _FAULT  /* Autovector Level 1   */
  76vector1A:       .long   _FAULT  /* Autovector Level 2   */
  77vector1B:       .long   _FAULT  /* Autovector Level 3   */
  78vector1C:       .long   _FAULT  /* Autovector Level 4   */
  79vector1D:       .long   _FAULT  /* Autovector Level 5   */
  80vector1E:       .long   _FAULT  /* Autovector Level 6   */
  81vector1F:       .long   _FAULT  /* Autovector Level 7   */
  82
  83/* TRAP #0 - #15 */
  84vector20_2F:
  85.long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  86.long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  87
  88/* Reserved     */
  89vector30_3F:
  90.long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  91.long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  92
  93vector64_127:
  94.long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  95.long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  96.long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  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
 103vector128_191:
 104.long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
 105.long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
 106.long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
 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
 113vector192_255:
 114.long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
 115.long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
 116.long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
 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
 123        .text
 124
 125        .globl  _start
 126_start:
 127        nop
 128        nop
 129        move.w #0x2700,%sr              /* Mask off Interrupt */
 130
 131        /* Set vector base register at the beginning of the Flash */
 132        move.l  #CONFIG_SYS_FLASH_BASE, %d0
 133        movec   %d0, %VBR
 134
 135        move.l  #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_CTRL), %d0
 136        movec   %d0, %RAMBAR0
 137
 138        move.l  #(CONFIG_SYS_INIT_RAM1_ADDR + CONFIG_SYS_INIT_RAM1_CTRL), %d0
 139        movec   %d0, %RAMBAR1
 140
 141        move.l  #CONFIG_SYS_MBAR, %d0           /* set MBAR address */
 142        move.c  %d0, %MBAR
 143
 144        /* invalidate and disable cache */
 145        move.l  #0x01040100, %d0        /* Invalidate cache cmd */
 146        movec   %d0, %CACR              /* Invalidate cache */
 147        move.l  #0, %d0
 148        movec   %d0, %ACR0
 149        movec   %d0, %ACR1
 150        movec   %d0, %ACR2
 151        movec   %d0, %ACR3
 152
 153        /* initialize general use internal ram */
 154        move.l #0, %d0
 155        move.l #(ICACHE_STATUS), %a1    /* icache */
 156        move.l #(DCACHE_STATUS), %a2    /* icache */
 157        move.l %d0, (%a1)
 158        move.l %d0, (%a2)
 159
 160        /* set stackpointer to end of internal ram to get some stackspace for the
 161           first c-code */
 162        move.l  #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_SP_OFFSET), %sp
 163        clr.l %sp@-
 164
 165        move.l #__got_start, %a5        /* put relocation table address to a5 */
 166
 167        bsr cpu_init_f                  /* run low-level CPU init code (from flash) */
 168        bsr board_init_f                /* run low-level board init code (from flash) */
 169
 170        /* board_init_f() does not return */
 171
 172/*------------------------------------------------------------------------------*/
 173
 174/*
 175 * void relocate_code (addr_sp, gd, addr_moni)
 176 *
 177 * This "function" does not return, instead it continues in RAM
 178 * after relocating the monitor code.
 179 *
 180 * r3 = dest
 181 * r4 = src
 182 * r5 = length in bytes
 183 * r6 = cachelinesize
 184 */
 185        .globl  relocate_code
 186relocate_code:
 187        link.w %a6,#0
 188        move.l 8(%a6), %sp              /* set new stack pointer */
 189
 190        move.l 12(%a6), %d0             /* Save copy of Global Data pointer */
 191        move.l 16(%a6), %a0             /* Save copy of Destination Address */
 192
 193        move.l #CONFIG_SYS_MONITOR_BASE, %a1
 194        move.l #__init_end, %a2
 195        move.l %a0, %a3
 196
 197        /* copy the code to RAM */
 1981:
 199        move.l (%a1)+, (%a3)+
 200        cmp.l  %a1,%a2
 201        bgt.s    1b
 202
 203/*
 204 * We are done. Do not return, instead branch to second part of board
 205 * initialization, now running from RAM.
 206 */
 207        move.l  %a0, %a1
 208        add.l   #(in_ram - CONFIG_SYS_MONITOR_BASE), %a1
 209        jmp     (%a1)
 210
 211in_ram:
 212
 213clear_bss:
 214        /*
 215         * Now clear BSS segment
 216         */
 217        move.l  %a0, %a1
 218        add.l   #(_sbss - CONFIG_SYS_MONITOR_BASE),%a1
 219        move.l  %a0, %d1
 220        add.l   #(_ebss - CONFIG_SYS_MONITOR_BASE),%d1
 2216:
 222        clr.l   (%a1)+
 223        cmp.l   %a1,%d1
 224        bgt.s   6b
 225
 226        /*
 227         * fix got table in RAM
 228         */
 229        move.l  %a0, %a1
 230        add.l   #(__got_start - CONFIG_SYS_MONITOR_BASE),%a1
 231        move.l  %a1,%a5         /* * fix got pointer register a5 */
 232
 233        move.l  %a0, %a2
 234        add.l   #(__got_end - CONFIG_SYS_MONITOR_BASE),%a2
 235
 2367:
 237        move.l  (%a1),%d1
 238        sub.l   #_start,%d1
 239        add.l   %a0,%d1
 240        move.l  %d1,(%a1)+
 241        cmp.l   %a2, %a1
 242        bne     7b
 243
 244        /* calculate relative jump to board_init_r in ram */
 245        move.l %a0, %a1
 246        add.l #(board_init_r - CONFIG_SYS_MONITOR_BASE), %a1
 247
 248        /* set parameters for board_init_r */
 249        move.l %a0,-(%sp)               /* dest_addr */
 250        move.l %d0,-(%sp)               /* gd */
 251        jsr     (%a1)
 252
 253/*------------------------------------------------------------------------------*/
 254/* exception code */
 255        .globl _fault
 256_fault:
 257        bra _fault
 258        .globl  _exc_handler
 259
 260_exc_handler:
 261        SAVE_ALL
 262        movel   %sp,%sp@-
 263        bsr exc_handler
 264        addql   #4,%sp
 265        RESTORE_ALL
 266
 267        .globl  _int_handler
 268_int_handler:
 269        SAVE_ALL
 270        movel   %sp,%sp@-
 271        bsr int_handler
 272        addql   #4,%sp
 273        RESTORE_ALL
 274
 275/*------------------------------------------------------------------------------*/
 276
 277        .globl  version_string
 278version_string:
 279        .ascii U_BOOT_VERSION
 280        .ascii " (", U_BOOT_DATE, " - ", U_BOOT_TIME, ")"
 281        .ascii CONFIG_IDENT_STRING, "\0"
 282        .align 4
 283