arch/m68k/cpu/mcf52x2/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  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <asm-offsets.h>
   9 #include <config.h>
  10 #include "version.h"
  11 #include <asm/cache.h>
  12
  13 #define _START  _start
  14 #define _FAULT  _fault
  15
  16
  17 #define SAVE_ALL                                                \
  18         move.w  #0x2700,%sr;            /* disable intrs */     \
  19         subl    #60,%sp;                /* space for 15 regs */ \
  20         moveml  %d0-%d7/%a0-%a6,%sp@;                           \
  21
  22 #define RESTORE_ALL                                             \
  23         moveml  %sp@,%d0-%d7/%a0-%a6;                           \
  24         addl    #60,%sp;                /* space for 15 regs */ \
  25         rte
  26
  27 /* If we come from a pre-loader we don't need an initial exception
  28  * table.
  29  */
  30 #if !defined(CONFIG_MONITOR_IS_IN_RAM)
  31
  32 .text
  33
  34 /*
  35  * Vector table. This is used for initial platform startup.
  36  * These vectors are to catch any un-intended traps.
  37  */
  38 _vectors:
  39 .long   0x00000000              /* Flash offset is 0 until we setup CS0 */
  40 #if defined(CONFIG_M5282) && (CONFIG_SYS_TEXT_BASE == CONFIG_SYS_INT_FLASH_BASE)
  41 .long   _start - CONFIG_SYS_TEXT_BASE
  42 #else
  43 .long   _START
  44 #endif
  45
  46 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  47 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  48 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  49 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  50 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  51 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  52 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  53 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  54
  55 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  56 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  57 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  58 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  59 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  60 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  61 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  62 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  63
  64 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  65 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  66 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  67 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  68 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  69 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  70 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  71 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  72
  73 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  74 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  75 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  76 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  77 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  78 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  79 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  80 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  81
  82 #endif
  83
  84 .text
  85
  86 #if defined(CONFIG_SYS_INT_FLASH_BASE) && \
  87     (defined(CONFIG_M5282) || defined(CONFIG_M5281))
  88 #if (CONFIG_SYS_TEXT_BASE == CONFIG_SYS_INT_FLASH_BASE)
  89 .long   0x55AA55AA,0xAA55AA55           /* CFM Backdoorkey */
  90 .long   0xFFFFFFFF                      /* all sectors protected */
  91 .long   0x00000000                      /* supervisor/User restriction */
  92 .long   0x00000000                      /* programm/data space restriction */
  93 .long   0x00000000                      /* Flash security */
  94 #endif
  95 #endif
  96
  97 .globl _start
  98 _start:
  99         nop
 100         nop
 101         move.w  #0x2700,%sr
 102
 103 #if defined(CONFIG_M5208)
 104         /* Initialize RAMBAR: locate SRAM and validate it */
 105         move.l  #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_CTRL), %d0
 106         movec   %d0, %RAMBAR1
 107 #endif
 108
 109 #if defined(CONFIG_M5272) || defined(CONFIG_M5249) || defined(CONFIG_M5253)
 110         /* set MBAR address + valid flag */
 111         move.l  #(CONFIG_SYS_MBAR + 1), %d0
 112         move.c  %d0, %MBAR
 113
 114         /*** The 5249 has MBAR2 as well ***/
 115 #ifdef CONFIG_SYS_MBAR2
 116         /* Get MBAR2 address */
 117         move.l  #(CONFIG_SYS_MBAR2 + 1), %d0
 118          /* Set MBAR2 */
 119         movec   %d0, #0xc0e
 120 #endif
 121         move.l  #(CONFIG_SYS_INIT_RAM_ADDR + 1), %d0
 122         movec   %d0, %RAMBAR0
 123 #endif /* CONFIG_M5272 || CONFIG_M5249 || CONFIG_M5253 */
 124
 125 #if defined(CONFIG_M5282) || defined(CONFIG_M5271)
 126         /* set MBAR address + valid flag */
 127         move.l  #(CONFIG_SYS_MBAR + 1), %d0
 128         move.l  %d0, 0x40000000
 129
 130         /* Initialize RAMBAR1: locate SRAM and validate it */
 131         move.l  #(CONFIG_SYS_INIT_RAM_ADDR + 0x21), %d0
 132         movec   %d0, %RAMBAR1
 133
 134 #if defined(CONFIG_M5282)
 135 #if (CONFIG_SYS_TEXT_BASE == CONFIG_SYS_INT_FLASH_BASE)
 136         /*
 137          * Setup code in SRAM to initialize FLASHBAR,
 138          * if start from internal Flash
 139          */
 140         move.l  #(_flashbar_setup-CONFIG_SYS_INT_FLASH_BASE), %a0
 141         move.l  #(_flashbar_setup_end-CONFIG_SYS_INT_FLASH_BASE), %a1
 142         move.l  #(CONFIG_SYS_INIT_RAM_ADDR), %a2
 143 _copy_flash:
 144         move.l  (%a0)+, (%a2)+
 145         cmp.l   %a0, %a1
 146         bgt.s   _copy_flash
 147         jmp     CONFIG_SYS_INIT_RAM_ADDR
 148
 149 _flashbar_setup:
 150         /* Initialize FLASHBAR: locate internal Flash and validate it */
 151         move.l  #(CONFIG_SYS_INT_FLASH_BASE + CONFIG_SYS_INT_FLASH_ENABLE), %d0
 152         movec   %d0, %FLASHBAR
 153         jmp     _after_flashbar_copy.L  /* Force jump to absolute address */
 154 _flashbar_setup_end:
 155         nop
 156 _after_flashbar_copy:
 157 #else
 158         /* Setup code to initialize FLASHBAR, if start from external Memory */
 159         move.l  #(CONFIG_SYS_INT_FLASH_BASE + CONFIG_SYS_INT_FLASH_ENABLE), %d0
 160         movec   %d0, %FLASHBAR
 161 #endif /* (CONFIG_SYS_TEXT_BASE == CONFIG_SYS_INT_FLASH_BASE) */
 162
 163 #endif
 164 #endif
 165         /*
 166          * if we come from a pre-loader we have no exception table and
 167          * therefore no VBR to set
 168          */
 169 #if !defined(CONFIG_MONITOR_IS_IN_RAM)
 170 #if defined(CONFIG_M5282) && (CONFIG_SYS_TEXT_BASE == CONFIG_SYS_INT_FLASH_BASE)
 171         move.l  #CONFIG_SYS_INT_FLASH_BASE, %d0
 172 #else
 173         move.l  #CONFIG_SYS_FLASH_BASE, %d0
 174 #endif
 175         movec   %d0, %VBR
 176 #endif
 177
 178 #ifdef CONFIG_M5275
 179         /* set MBAR address + valid flag */
 180         move.l  #(CONFIG_SYS_MBAR + 1), %d0
 181         move.l  %d0, 0x40000000
 182 /*      movec   %d0, %MBAR */
 183
 184         /* Initialize RAMBAR: locate SRAM and validate it */
 185         move.l  #(CONFIG_SYS_INIT_RAM_ADDR + 0x21), %d0
 186         movec   %d0, %RAMBAR1
 187 #endif
 188
 189         /* initialize general use internal ram */
 190         move.l  #0, %d0
 191         move.l  #(ICACHE_STATUS), %a1   /* icache */
 192         move.l  #(DCACHE_STATUS), %a2   /* icache */
 193         move.l  %d0, (%a1)
 194         move.l  %d0, (%a2)
 195
 196         /* put relocation table address to a5 */
 197         move.l  #__got_start, %a5
 198
 199         /* setup stack initially on top of internal static ram  */
 200         move.l  #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_SIZE), %sp
 201
 202         /*
 203          * if configured, malloc_f arena will be reserved first,
 204          * then (and always) gd struct space will be reserved
 205          */
 206         move.l  %sp, -(%sp)
 207         move.l  #board_init_f_alloc_reserve, %a1
 208         jsr     (%a1)
 209
 210         /* update stack and frame-pointers */
 211         move.l  %d0, %sp
 212         move.l  %sp, %fp
 213
 214         /* initialize reserved area */
 215         move.l  %d0, -(%sp)
 216         move.l  #board_init_f_init_reserve, %a1
 217         jsr     (%a1)
 218
 219         /* run low-level CPU init code (from flash) */
 220         move.l  #cpu_init_f, %a1
 221         jsr     (%a1)
 222
 223         /* run low-level board init code (from flash) */
 224         clr.l   %sp@-
 225         move.l  #board_init_f, %a1
 226         jsr     (%a1)
 227
 228         /* board_init_f() does not return */
 229
 230 /******************************************************************************/
 231
 232 /*
 233  * void relocate_code (addr_sp, gd, addr_moni)
 234  *
 235  * This "function" does not return, instead it continues in RAM
 236  * after relocating the monitor code.
 237  *
 238  * r3 = dest
 239  * r4 = src
 240  * r5 = length in bytes
 241  * r6 = cachelinesize
 242  */
 243 .globl relocate_code
 244 relocate_code:
 245         link.w  %a6,#0
 246         move.l  8(%a6), %sp             /* set new stack pointer */
 247
 248         move.l  12(%a6), %d0            /* Save copy of Global Data pointer */
 249         move.l  16(%a6), %a0            /* Save copy of Destination Address */
 250
 251         move.l  #CONFIG_SYS_MONITOR_BASE, %a1
 252         move.l  #__init_end, %a2
 253         move.l  %a0, %a3
 254         /* copy the code to RAM */
 255 1:
 256         move.l  (%a1)+, (%a3)+
 257         cmp.l   %a1,%a2
 258         bgt.s   1b
 259
 260 /*
 261  * We are done. Do not return, instead branch to second part of board
 262  * initialization, now running from RAM.
 263  */
 264         move.l  %a0, %a1
 265         add.l   #(in_ram - CONFIG_SYS_MONITOR_BASE), %a1
 266         jmp     (%a1)
 267
 268 in_ram:
 269
 270 clear_bss:
 271         /*
 272          * Now clear BSS segment
 273          */
 274         move.l  %a0, %a1
 275         add.l   #(_sbss - CONFIG_SYS_MONITOR_BASE),%a1
 276         move.l  %a0, %d1
 277         add.l   #(_ebss - CONFIG_SYS_MONITOR_BASE),%d1
 278 6:
 279         clr.l   (%a1)+
 280         cmp.l   %a1,%d1
 281         bgt.s   6b
 282
 283         /*
 284          * fix got table in RAM
 285          */
 286         move.l  %a0, %a1
 287         add.l   #(__got_start - CONFIG_SYS_MONITOR_BASE),%a1
 288         move.l  %a1,%a5                 /* fix got pointer register a5 */
 289
 290         move.l  %a0, %a2
 291         add.l   #(__got_end - CONFIG_SYS_MONITOR_BASE),%a2
 292
 293 7:
 294         move.l  (%a1),%d1
 295         sub.l   #_start,%d1
 296         add.l   %a0,%d1
 297         move.l  %d1,(%a1)+
 298         cmp.l   %a2, %a1
 299         bne     7b
 300
 301         /* calculate relative jump to board_init_r in ram */
 302         move.l  %a0, %a1
 303         add.l   #(board_init_r - CONFIG_SYS_MONITOR_BASE), %a1
 304
 305         /* set parameters for board_init_r */
 306         move.l  %a0,-(%sp)              /* dest_addr */
 307         move.l  %d0,-(%sp)              /* gd */
 308 #if defined(DEBUG) && (CONFIG_SYS_TEXT_BASE != CONFIG_SYS_INT_FLASH_BASE) && \
 309     defined(CONFIG_SYS_HALT_BEFOR_RAM_JUMP)
 310         halt
 311 #endif
 312         jsr     (%a1)
 313
 314 /******************************************************************************/
 315
 316 /* exception code */
 317 .globl _fault
 318 _fault:
 319         bra     _fault
 320
 321 .globl _exc_handler
 322 _exc_handler:
 323         SAVE_ALL
 324         movel   %sp,%sp@-
 325         bsr     exc_handler
 326         addql   #4,%sp
 327         RESTORE_ALL
 328
 329 .globl _int_handler
 330 _int_handler:
 331         SAVE_ALL
 332         movel   %sp,%sp@-
 333         bsr     int_handler
 334         addql   #4,%sp
 335         RESTORE_ALL
 336
 337 /******************************************************************************/
 338
 339 .globl version_string
 340 version_string:
 341 .ascii U_BOOT_VERSION_STRING, "\0"
 342 .align 4