LXR uboot/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
  28#ifndef  CONFIG_IDENT_STRING
  29#define  CONFIG_IDENT_STRING ""
  30#endif
  31
  32/* last three long word reserved for cache status */
  33#define ICACHE_STATUS   (CONFIG_SYS_INIT_RAM_ADDR+CONFIG_SYS_INIT_RAM_END- 4)
  34#define DCACHE_STATUS   (CONFIG_SYS_INIT_RAM_ADDR+CONFIG_SYS_INIT_RAM_END- 8)
  35#define CACR_STATUS     (CONFIG_SYS_INIT_RAM_ADDR+CONFIG_SYS_INIT_RAM_END-12)
  36
  37#define _START  _start
  38#define _FAULT  _fault
  39
  40#define SAVE_ALL                                                \
  41        move.w  #0x2700,%sr;            /* disable intrs */     \
  42        subl    #60,%sp;                /* space for 15 regs */ \
  43        moveml  %d0-%d7/%a0-%a6,%sp@;
  44
  45#define RESTORE_ALL                                             \
  46        moveml  %sp@,%d0-%d7/%a0-%a6;                           \
  47        addl    #60,%sp;                /* space for 15 regs */ \
  48        rte;
  49
  50.text
  51/*
  52 *      Vector table. This is used for initial platform startup.
  53 *      These vectors are to catch any un-intended traps.
  54 */
  55_vectors:
  56
  57INITSP:         .long   0x00000000      /* Initial SP   */
  58INITPC:         .long   _START  /* Initial PC           */
  59vector02:       .long   _FAULT  /* Access Error         */
  60vector03:       .long   _FAULT  /* Address Error        */
  61vector04:       .long   _FAULT  /* Illegal Instruction  */
  62vector05:       .long   _FAULT  /* Reserved             */
  63vector06:       .long   _FAULT  /* Reserved             */
  64vector07:       .long   _FAULT  /* Reserved             */
  65vector08:       .long   _FAULT  /* Privilege Violation  */
  66vector09:       .long   _FAULT  /* Trace                */
  67vector0A:       .long   _FAULT  /* Unimplemented A-Line */
  68vector0B:       .long   _FAULT  /* Unimplemented F-Line */
  69vector0C:       .long   _FAULT  /* Debug Interrupt      */
  70vector0D:       .long   _FAULT  /* Reserved             */
  71vector0E:       .long   _FAULT  /* Format Error         */
  72vector0F:       .long   _FAULT  /* Unitialized Int.     */
  73
  74/* Reserved */
  75vector10_17:
  76.long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  77
  78vector18:       .long   _FAULT  /* Spurious Interrupt   */
  79vector19:       .long   _FAULT  /* Autovector Level 1   */
  80vector1A:       .long   _FAULT  /* Autovector Level 2   */
  81vector1B:       .long   _FAULT  /* Autovector Level 3   */
  82vector1C:       .long   _FAULT  /* Autovector Level 4   */
  83vector1D:       .long   _FAULT  /* Autovector Level 5   */
  84vector1E:       .long   _FAULT  /* Autovector Level 6   */
  85vector1F:       .long   _FAULT  /* Autovector Level 7   */
  86
  87/* TRAP #0 - #15 */
  88vector20_2F:
  89.long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  90.long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  91
  92/* Reserved     */
  93vector30_3F:
  94.long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  95.long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  96
  97vector64_127:
  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.long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
 106
 107vector128_191:
 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.long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
 116
 117vector192_255:
 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.long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
 126
 127        .text
 128
 129        .globl  _start
 130_start:
 131        nop
 132        nop
 133        move.w #0x2700,%sr              /* Mask off Interrupt */
 134
 135        /* Set vector base register at the beginning of the Flash */
 136        move.l  #CONFIG_SYS_FLASH_BASE, %d0
 137        movec   %d0, %VBR
 138
 139        move.l  #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_CTRL), %d0
 140        movec   %d0, %RAMBAR0
 141
 142        move.l  #(CONFIG_SYS_INIT_RAM1_ADDR + CONFIG_SYS_INIT_RAM1_CTRL), %d0
 143        movec   %d0, %RAMBAR1
 144
 145        move.l  #CONFIG_SYS_MBAR, %d0           /* set MBAR address */
 146        move.c  %d0, %MBAR
 147
 148        /* invalidate and disable cache */
 149        move.l  #0x01040100, %d0        /* Invalidate cache cmd */
 150        movec   %d0, %CACR              /* Invalidate cache */
 151        move.l  #0, %d0
 152        movec   %d0, %ACR0
 153        movec   %d0, %ACR1
 154        movec   %d0, %ACR2
 155        movec   %d0, %ACR3
 156
 157        /* initialize general use internal ram */
 158        move.l #0, %d0
 159        move.l #(ICACHE_STATUS), %a1    /* icache */
 160        move.l #(DCACHE_STATUS), %a2    /* icache */
 161        move.l #(CACR_STATUS), %a3      /* CACR */
 162        move.l %d0, (%a1)
 163        move.l %d0, (%a2)
 164        move.l %d0, (%a3)
 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
 192relocate_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 */
 2041:
 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
 217in_ram:
 218
 219clear_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
 2276:
 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
 2427:
 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        bra _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
 284icache_enable:
 285        move.l  #(CONFIG_SYS_SDRAM_BASE + 0x1c000), %d0
 286        movec   %d0, %ACR2                      /* Enable cache */
 287
 288        move.l  #0x020C8100, %d0                /* Setup cache mask */
 289        movec   %d0, %CACR                      /* Enable cache */
 290        nop
 291
 292        move.l #(ICACHE_STATUS), %a1
 293        moveq   #1, %d0
 294        move.l  %d0, (%a1)
 295        rts
 296
 297        .globl  icache_disable
 298icache_disable:
 299        move.l  #0x000C8100, %d0                /* Setup cache mask */
 300        movec   %d0, %CACR                      /* Disable cache */
 301        clr.l   %d0                             /* Setup cache mask */
 302        movec   %d0, %ACR2
 303        movec   %d0, %ACR3
 304
 305        move.l #(ICACHE_STATUS), %a1
 306        moveq   #0, %d0
 307        move.l  %d0, (%a1)
 308        rts
 309
 310        .globl  icache_invalid
 311icache_invalid:
 312        move.l  #0x000C8100, %d0                /* Setup cache mask */
 313        movec   %d0, %CACR                      /* Enable cache */
 314        rts
 315
 316        .globl  icache_status
 317icache_status:
 318        move.l #(ICACHE_STATUS), %a1
 319        move.l  (%a1), %d0
 320        rts
 321
 322        .globl  dcache_enable
 323dcache_enable:
 324        bsr     icache_disable
 325
 326        move.l  #(CONFIG_SYS_SDRAM_BASE + 0xc000), %d0
 327        movec   %d0, %ACR0                      /* Enable cache */
 328
 329        move.l  #0xA30C8100, %d0                /* Invalidate cache cmd */
 330        movec   %d0, %CACR                      /* Invalidate cache */
 331
 332        move.l #(DCACHE_STATUS), %a1
 333        moveq   #1, %d0
 334        move.l  %d0, (%a1)
 335        rts
 336
 337        .globl  dcache_disable
 338dcache_disable:
 339        move.l  #0xA30C8100, %d0                /* Setup cache mask */
 340        movec   %d0, %CACR                      /* Disable cache */
 341        clr.l   %d0                             /* Setup cache mask */
 342        movec   %d0, %ACR0
 343        movec   %d0, %ACR1
 344
 345        move.l #(DCACHE_STATUS), %a1
 346        moveq   #0, %d0
 347        move.l  %d0, (%a1)
 348        rts
 349
 350        .globl  dcache_status
 351dcache_status:
 352        move.l #(DCACHE_STATUS), %a1
 353        move.l  (%a1), %d0
 354        rts
 355
 356/*------------------------------------------------------------------------------*/
 357
 358        .globl  version_string
 359version_string:
 360        .ascii U_BOOT_VERSION
 361        .ascii " (", U_BOOT_DATE, " - ", U_BOOT_TIME, ")"
 362        .ascii CONFIG_IDENT_STRING, "\0"
 363        .align 4
 364