cpu/mcf532x/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  * (C) Copyright 2004-2008 Freescale Semiconductor, Inc.
   6  * TsiChung Liew (Tsi-Chung.Liew@freescale.com)
   7  *
   8  * See file CREDITS for list of people who contributed to this
   9  * project.
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License as
  13  * published by the Free Software Foundation; either version 2 of
  14  * the License, or (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  24  * MA 02111-1307 USA
  25  */
  26
  27 #include <config.h>
  28 #include <timestamp.h>
  29 #include "version.h"
  30
  31 #ifndef  CONFIG_IDENT_STRING
  32 #define  CONFIG_IDENT_STRING ""
  33 #endif
  34
  35 #define _START  _start
  36 #define _FAULT  _fault
  37
  38 #define SAVE_ALL                                                \
  39         move.w  #0x2700,%sr;            /* disable intrs */     \
  40         subl    #60,%sp;                /* space for 15 regs */ \
  41         moveml  %d0-%d7/%a0-%a6,%sp@;
  42
  43 #define RESTORE_ALL                                             \
  44         moveml  %sp@,%d0-%d7/%a0-%a6;                           \
  45         addl    #60,%sp;                /* space for 15 regs */ \
  46         rte;
  47
  48 #if !defined(CONFIG_MONITOR_IS_IN_RAM)
  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 #endif /* !defined(CONFIG_MONITOR_IS_IN_RAM) */
 126
 127         .text
 128
 129         .globl  _start
 130 _start:
 131         nop
 132         nop
 133         move.w #0x2700,%sr      /* Mask off Interrupt */
 134
 135 #if !defined(CONFIG_MONITOR_IS_IN_RAM)
 136         /* Set vector base register at the beginning of the Flash */
 137         move.l  #CONFIG_SYS_FLASH_BASE, %d0
 138         movec   %d0, %VBR
 139 #endif
 140
 141         move.l  #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_CTRL), %d0
 142         movec   %d0, %RAMBAR1
 143
 144         /* invalidate and disable cache */
 145         move.l  #0x01000000, %d0                /* Invalidate cache cmd */
 146         movec   %d0, %CACR                      /* Invalidate cache */
 147         move.l  #0, %d0
 148         movec   %d0, %ACR0
 149         movec   %d0, %ACR1
 150
 151 #ifdef CONFIG_MCF5301x
 152         move.l  #(0xFC0a0010), %a0
 153         move.w  (%a0), %d0
 154         and.l   %d0, 0xEFFF
 155
 156         move.w  %d0, (%a0)
 157 #endif
 158
 159         /* initialize general use internal ram */
 160         move.l #0, %d0
 161         move.l #(CONFIG_SYS_INIT_RAM_ADDR+CONFIG_SYS_INIT_RAM_END-8), %a1
 162         move.l #(CONFIG_SYS_INIT_RAM_ADDR+CONFIG_SYS_INIT_RAM_END-4), %a2
 163         move.l %d0, (%a1)
 164         move.l %d0, (%a2)
 165
 166         /* set stackpointer to end of internal ram to get some stackspace for the
 167            first c-code */
 168         move.l  #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_SP_OFFSET), %sp
 169         clr.l %sp@-
 170
 171         move.l #__got_start, %a5        /* put relocation table address to a5 */
 172
 173         bsr cpu_init_f                  /* run low-level CPU init code (from flash) */
 174         bsr board_init_f                /* run low-level board init code (from flash) */
 175
 176         /* board_init_f() does not return */
 177
 178 /*------------------------------------------------------------------------------*/
 179
 180 /*
 181  * void relocate_code (addr_sp, gd, addr_moni)
 182  *
 183  * This "function" does not return, instead it continues in RAM
 184  * after relocating the monitor code.
 185  *
 186  * r3 = dest
 187  * r4 = src
 188  * r5 = length in bytes
 189  * r6 = cachelinesize
 190  */
 191         .globl  relocate_code
 192 relocate_code:
 193         link.w %a6,#0
 194         move.l 8(%a6), %sp              /* set new stack pointer */
 195
 196         move.l 12(%a6), %d0             /* Save copy of Global Data pointer */
 197         move.l 16(%a6), %a0             /* Save copy of Destination Address */
 198
 199         move.l #CONFIG_SYS_MONITOR_BASE, %a1
 200         move.l #__init_end, %a2
 201         move.l %a0, %a3
 202
 203         /* copy the code to RAM */
 204 1:
 205         move.l (%a1)+, (%a3)+
 206         cmp.l  %a1,%a2
 207         bgt.s    1b
 208
 209 /*
 210  * We are done. Do not return, instead branch to second part of board
 211  * initialization, now running from RAM.
 212  */
 213         move.l  %a0, %a1
 214         add.l   #(in_ram - CONFIG_SYS_MONITOR_BASE), %a1
 215         jmp     (%a1)
 216
 217 in_ram:
 218
 219 clear_bss:
 220         /*
 221          * Now clear BSS segment
 222          */
 223         move.l  %a0, %a1
 224         add.l   #(_sbss - CONFIG_SYS_MONITOR_BASE),%a1
 225         move.l  %a0, %d1
 226         add.l   #(_ebss - CONFIG_SYS_MONITOR_BASE),%d1
 227 6:
 228         clr.l   (%a1)+
 229         cmp.l   %a1,%d1
 230         bgt.s   6b
 231
 232         /*
 233          * fix got table in RAM
 234          */
 235         move.l  %a0, %a1
 236         add.l   #(__got_start - CONFIG_SYS_MONITOR_BASE),%a1
 237         move.l  %a1,%a5         /* * fix got pointer register a5 */
 238
 239         move.l  %a0, %a2
 240         add.l   #(__got_end - CONFIG_SYS_MONITOR_BASE),%a2
 241
 242 7:
 243         move.l  (%a1),%d1
 244         sub.l   #_start,%d1
 245         add.l   %a0,%d1
 246         move.l  %d1,(%a1)+
 247         cmp.l   %a2, %a1
 248         bne     7b
 249
 250         /* calculate relative jump to board_init_r in ram */
 251         move.l %a0, %a1
 252         add.l #(board_init_r - CONFIG_SYS_MONITOR_BASE), %a1
 253
 254         /* set parameters for board_init_r */
 255         move.l %a0,-(%sp)               /* dest_addr */
 256         move.l %d0,-(%sp)               /* gd */
 257         jsr     (%a1)
 258
 259 /*------------------------------------------------------------------------------*/
 260 /* exception code */
 261         .globl _fault
 262 _fault:
 263         jmp _fault
 264         .globl  _exc_handler
 265
 266 _exc_handler:
 267         SAVE_ALL
 268         movel   %sp,%sp@-
 269         bsr exc_handler
 270         addql   #4,%sp
 271         RESTORE_ALL
 272
 273         .globl  _int_handler
 274 _int_handler:
 275         SAVE_ALL
 276         movel   %sp,%sp@-
 277         bsr int_handler
 278         addql   #4,%sp
 279         RESTORE_ALL
 280
 281 /*------------------------------------------------------------------------------*/
 282 /* cache functions */
 283         .globl  icache_enable
 284 icache_enable:
 285         move.l  #0x01000000, %d0                /* Invalidate cache cmd */
 286         movec   %d0, %CACR                      /* Invalidate cache */
 287         move.l  #(CONFIG_SYS_SDRAM_BASE + 0xc000 + ((CONFIG_SYS_SDRAM_SIZE & 0x1fe0) << 11)), %d0
 288         movec   %d0, %ACR0                      /* Enable cache */
 289
 290         move.l  #0x80000200, %d0                /* Setup cache mask */
 291         movec   %d0, %CACR                      /* Enable cache */
 292         nop
 293
 294         move.l #(CONFIG_SYS_INIT_RAM_ADDR+CONFIG_SYS_INIT_RAM_END-8), %a1
 295         moveq   #1, %d0
 296         move.l  %d0, (%a1)
 297         rts
 298
 299         .globl  icache_disable
 300 icache_disable:
 301         move.l  #0x01000000, %d0                /* Setup cache mask */
 302         movec   %d0, %CACR                      /* Disable cache */
 303         clr.l   %d0                             /* Setup cache mask */
 304         movec   %d0, %ACR0
 305         movec   %d0, %ACR1
 306
 307         move.l #(CONFIG_SYS_INIT_RAM_ADDR+CONFIG_SYS_INIT_RAM_END-8), %a1
 308         moveq   #0, %d0
 309         move.l  %d0, (%a1)
 310         rts
 311
 312         .globl  icache_status
 313 icache_status:
 314         move.l #(CONFIG_SYS_INIT_RAM_ADDR+CONFIG_SYS_INIT_RAM_END-8), %a1
 315         move.l  (%a1), %d0
 316         rts
 317
 318         .globl  icache_invalid
 319 icache_invalid:
 320         move.l  #0x81000200, %d0                /* Setup cache mask */
 321         movec   %d0, %CACR                      /* Enable cache */
 322         rts
 323
 324         .globl  dcache_enable
 325 dcache_enable:
 326         move.l #(CONFIG_SYS_INIT_RAM_ADDR+CONFIG_SYS_INIT_RAM_END-4), %a1
 327         moveq   #1, %d0
 328         move.l  %d0, (%a1)
 329         rts
 330
 331     /* No dcache, just a dummy function */
 332         .globl  dcache_disable
 333 dcache_disable:
 334         move.l #(CONFIG_SYS_INIT_RAM_ADDR+CONFIG_SYS_INIT_RAM_END-4), %a1
 335         moveq   #0, %d0
 336         move.l  %d0, (%a1)
 337         rts
 338
 339         .globl  dcache_status
 340 dcache_status:
 341         move.l #(CONFIG_SYS_INIT_RAM_ADDR+CONFIG_SYS_INIT_RAM_END-4), %a1
 342         move.l  (%a1), %d0
 343         rts
 344
 345 /*------------------------------------------------------------------------------*/
 346
 347         .globl  version_string
 348 version_string:
 349         .ascii U_BOOT_VERSION
 350         .ascii " (", U_BOOT_DATE, " - ", U_BOOT_TIME, ")"
 351         .ascii CONFIG_IDENT_STRING, "\0"
 352         .align 4