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  * 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
  32 #define _START  _start
  33 #define _FAULT  _fault
  34
  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 /* If we come from a pre-loader we don't need an initial exception
  47  * table.
  48  */
  49 #if !defined(CONFIG_MONITOR_IS_IN_RAM)
  50
  51 .text
  52 /*
  53  *      Vector table. This is used for initial platform startup.
  54  *      These vectors are to catch any un-intended traps.
  55  */
  56 _vectors:
  57
  58 .long   0x00000000              /* Flash offset is 0 until we setup CS0 */
  59 #if defined(CONFIG_R5200)
  60 .long   0x400
  61 #elif defined(CONFIG_M5282) && (TEXT_BASE == CFG_INT_FLASH_BASE)
  62 .long   _start - TEXT_BASE
  63 #else
  64 .long   _START
  65 #endif
  66
  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 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  73 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  74 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  75
  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 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  82 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  83 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  84
  85 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  86 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  87 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  88 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  89 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  90 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  91 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  92 .long   _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
  93
  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
 103 #endif
 104
 105         .text
 106
 107
 108 #if defined(CFG_INT_FLASH_BASE) && \
 109     (defined(CONFIG_M5282) || defined(CONFIG_M5281))
 110         #if (TEXT_BASE == CFG_INT_FLASH_BASE)
 111                 .long   0x55AA55AA,0xAA55AA55 /* CFM Backdoorkey */
 112                 .long   0xFFFFFFFF /* all sectors protected */
 113                 .long   0x00000000 /* supervisor/User restriction */
 114                 .long   0x00000000 /* programm/data space restriction */
 115                 .long   0x00000000 /* Flash security */
 116         #endif
 117 #endif
 118         .globl  _start
 119 _start:
 120         nop
 121         nop
 122         move.w #0x2700,%sr
 123
 124 #if defined(CONFIG_M5272) || defined(CONFIG_M5249) || defined(CONFIG_M5253)
 125         move.l  #(CFG_MBAR + 1), %d0            /* set MBAR address + valid flag */
 126         move.c  %d0, %MBAR
 127
 128         /*** The 5249 has MBAR2 as well ***/
 129 #ifdef CFG_MBAR2
 130         move.l  #(CFG_MBAR2 + 1), %d0           /* Get MBAR2 address */
 131         movec   %d0, #0xc0e                     /* Set MBAR2 */
 132 #endif
 133
 134         move.l  #(CFG_INIT_RAM_ADDR + 1), %d0
 135         movec   %d0, %RAMBAR0
 136 #endif /* CONFIG_M5272 || CONFIG_M5249 || CONFIG_M5253 */
 137
 138 #if defined(CONFIG_M5282) || defined(CONFIG_M5271)
 139         /* Initialize IPSBAR */
 140         move.l  #(CFG_MBAR + 1), %d0            /* set IPSBAR address + valid flag */
 141         move.l  %d0, 0x40000000
 142
 143         /* Initialize RAMBAR1: locate SRAM and validate it */
 144         move.l  #(CFG_INIT_RAM_ADDR + 0x21), %d0
 145         movec   %d0, %RAMBAR1
 146
 147 #if defined(CONFIG_M5282)
 148 #if (TEXT_BASE == CFG_INT_FLASH_BASE)
 149         /* Setup code in SRAM to initialize FLASHBAR, if start from internal Flash */
 150
 151         move.l #(_flashbar_setup-CFG_INT_FLASH_BASE), %a0
 152         move.l #(_flashbar_setup_end-CFG_INT_FLASH_BASE), %a1
 153         move.l #(CFG_INIT_RAM_ADDR), %a2
 154 _copy_flash:
 155         move.l (%a0)+, (%a2)+
 156         cmp.l %a0, %a1
 157         bgt.s _copy_flash
 158         jmp CFG_INIT_RAM_ADDR
 159
 160 _flashbar_setup:
 161         /* Initialize FLASHBAR: locate internal Flash and validate it */
 162         move.l  #(CFG_INT_FLASH_BASE + CFG_INT_FLASH_ENABLE), %d0
 163         movec   %d0, %RAMBAR0
 164         jmp _after_flashbar_copy.L      /* Force jump to absolute address */
 165 _flashbar_setup_end:
 166         nop
 167 _after_flashbar_copy:
 168 #else
 169         /* Setup code to initialize FLASHBAR, if start from external Memory */
 170         move.l  #(CFG_INT_FLASH_BASE + CFG_INT_FLASH_ENABLE), %d0
 171         movec   %d0, %RAMBAR0
 172 #endif /* (TEXT_BASE == CFG_INT_FLASH_BASE) */
 173
 174 #endif
 175 #endif
 176         /* if we come from a pre-loader we have no exception table and
 177          * therefore no VBR to set
 178          */
 179 #if !defined(CONFIG_MONITOR_IS_IN_RAM)
 180 #if defined(CONFIG_M5282) && (TEXT_BASE == CFG_INT_FLASH_BASE)
 181         move.l  #CFG_INT_FLASH_BASE, %d0
 182 #else
 183         move.l  #CFG_FLASH_BASE, %d0
 184 #endif
 185         movec   %d0, %VBR
 186 #endif
 187
 188 #ifdef  CONFIG_R5200
 189         move.l  #(_flash_setup-CFG_FLASH_BASE), %a0
 190         move.l  #(_flash_setup_end-CFG_FLASH_BASE), %a1
 191         move.l  #(CFG_INIT_RAM_ADDR), %a2
 192 _copy_flash:
 193         move.l  (%a0)+, (%a2)+
 194         cmp.l   %a0, %a1
 195         bgt.s   _copy_flash
 196         jmp     CFG_INIT_RAM_ADDR
 197 _after_flash_copy:
 198 #endif
 199
 200 #if 0
 201         /* invalidate and disable cache */
 202         move.l  #0x01000000, %d0                /* Invalidate cache cmd */
 203         movec   %d0, %CACR                      /* Invalidate cache */
 204         move.l  #0, %d0
 205         movec   %d0, %ACR0
 206         movec   %d0, %ACR1
 207 #endif
 208
 209         /* set stackpointer to end of internal ram to get some stackspace for the first c-code */
 210         move.l  #(CFG_INIT_RAM_ADDR + CFG_INIT_SP_OFFSET), %sp
 211         clr.l %sp@-
 212
 213         move.l #__got_start, %a5                /* put relocation table address to a5 */
 214
 215         bsr cpu_init_f                          /* run low-level CPU init code (from flash) */
 216         bsr board_init_f                        /* run low-level board init code (from flash) */
 217
 218         /* board_init_f() does not return */
 219
 220 /*------------------------------------------------------------------------------*/
 221
 222 #ifdef  CONFIG_R5200
 223 _flash_setup:
 224         /* CSAR0 */
 225         move.l  #((CFG_FLASH_BASE & 0xffff0000) >> 16), %d0
 226         move.w  %d0, 0x40000080
 227
 228         /* CSCR0 */
 229         move.l  #0x2180, %d0            /* 8 wait states, 16bit port, auto ack,  */
 230         move.w  %d0, 0x4000008A
 231
 232         /* CSMR0 */
 233         move.l  #0x001f0001, %d0        /* 2 MB, valid */
 234         move.l  %d0, 0x40000084
 235
 236         jmp     _after_flash_copy.L
 237 _flash_setup_end:
 238 #endif
 239
 240 /*
 241  * void relocate_code (addr_sp, gd, addr_moni)
 242  *
 243  * This "function" does not return, instead it continues in RAM
 244  * after relocating the monitor code.
 245  *
 246  * r3 = dest
 247  * r4 = src
 248  * r5 = length in bytes
 249  * r6 = cachelinesize
 250  */
 251         .globl  relocate_code
 252 relocate_code:
 253         link.w %a6,#0
 254         move.l 8(%a6), %sp              /* set new stack pointer */
 255
 256         move.l 12(%a6), %d0             /* Save copy of Global Data pointer */
 257         move.l 16(%a6), %a0             /* Save copy of Destination Address */
 258
 259         move.l #CFG_MONITOR_BASE, %a1
 260         move.l #__init_end, %a2
 261         move.l %a0, %a3
 262         /* copy the code to RAM */
 263 1:
 264         move.l (%a1)+, (%a3)+
 265         cmp.l  %a1,%a2
 266         bgt.s    1b
 267
 268 /*
 269  * We are done. Do not return, instead branch to second part of board
 270  * initialization, now running from RAM.
 271  */
 272         move.l  %a0, %a1
 273         add.l   #(in_ram - CFG_MONITOR_BASE), %a1
 274         jmp     (%a1)
 275
 276 in_ram:
 277
 278 clear_bss:
 279         /*
 280          * Now clear BSS segment
 281          */
 282         move.l  %a0, %a1
 283         add.l   #(_sbss - CFG_MONITOR_BASE),%a1
 284         move.l  %a0, %d1
 285         add.l   #(_ebss - CFG_MONITOR_BASE),%d1
 286 6:
 287         clr.l   (%a1)+
 288         cmp.l   %a1,%d1
 289         bgt.s   6b
 290
 291         /*
 292          * fix got table in RAM
 293          */
 294         move.l  %a0, %a1
 295         add.l   #(__got_start - CFG_MONITOR_BASE),%a1
 296         move.l  %a1,%a5         /* * fix got pointer register a5 */
 297
 298         move.l  %a0, %a2
 299         add.l   #(__got_end - CFG_MONITOR_BASE),%a2
 300
 301 7:
 302         move.l  (%a1),%d1
 303         sub.l   #_start,%d1
 304         add.l   %a0,%d1
 305         move.l  %d1,(%a1)+
 306         cmp.l   %a2, %a1
 307         bne     7b
 308
 309 #if defined(CONFIG_M5281) || defined(CONFIG_M5282)
 310         /* patch the 3 accesspoints to 3 ichache_state */
 311         /* quick and dirty */
 312
 313         move.l  %a0,%d1
 314         add.l   #(icache_state - CFG_MONITOR_BASE),%d1
 315         move.l  %a0,%a1
 316         add.l   #(icache_state_access_1+2 - CFG_MONITOR_BASE),%a1
 317         move.l  %d1,(%a1)
 318         move.l  %a0,%a1
 319         add.l   #(icache_state_access_2+2 - CFG_MONITOR_BASE),%a1
 320         move.l  %d1,(%a1)
 321         move.l  %a0,%a1
 322         add.l   #(icache_state_access_3+2 - CFG_MONITOR_BASE),%a1
 323         move.l  %d1,(%a1)
 324 #endif
 325
 326         /* calculate relative jump to board_init_r in ram */
 327         move.l %a0, %a1
 328         add.l #(board_init_r - CFG_MONITOR_BASE), %a1
 329
 330         /* set parameters for board_init_r */
 331         move.l %a0,-(%sp)               /* dest_addr */
 332         move.l %d0,-(%sp)               /* gd */
 333 #if defined(DEBUG) && (TEXT_BASE != CFG_INT_FLASH_BASE) && \
 334     defined(CFG_HALT_BEFOR_RAM_JUMP)
 335         halt
 336 #endif
 337         jsr     (%a1)
 338
 339 /*------------------------------------------------------------------------------*/
 340 /* exception code */
 341         .globl _fault
 342 _fault:
 343         jmp _fault
 344
 345         .globl  _exc_handler
 346 _exc_handler:
 347         SAVE_ALL
 348         movel   %sp,%sp@-
 349         bsr exc_handler
 350         addql   #4,%sp
 351         RESTORE_ALL
 352
 353         .globl  _int_handler
 354 _int_handler:
 355         SAVE_ALL
 356         movel   %sp,%sp@-
 357         bsr int_handler
 358         addql   #4,%sp
 359         RESTORE_ALL
 360
 361 /*------------------------------------------------------------------------------*/
 362 /* cache functions */
 363 #ifdef  CONFIG_M5271
 364         .globl  icache_enable
 365 icache_enable:
 366         move.l  #0x01000000, %d0                /* Invalidate cache cmd */
 367         movec   %d0, %CACR                      /* Invalidate cache */
 368         move.l  #(CFG_SDRAM_BASE + 0xc000), %d0 /* Setup cache mask */
 369         movec   %d0, %ACR0                      /* Enable cache */
 370
 371         move.l  #0x80000200, %d0                /* Setup cache mask */
 372         movec   %d0, %CACR                      /* Enable cache */
 373         nop
 374
 375         move.l #(CFG_INIT_RAM_ADDR+CFG_INIT_RAM_END-8), %a1
 376         moveq   #1, %d0
 377         move.l  %d0, (%a1)
 378         rts
 379 #endif
 380
 381 #ifdef  CONFIG_M5272
 382         .globl  icache_enable
 383 icache_enable:
 384         move.l  #0x01000000, %d0                /* Invalidate cache cmd */
 385         movec   %d0, %CACR                      /* Invalidate cache */
 386         move.l  #0x0000c000, %d0                /* Setup cache mask */
 387         movec   %d0, %ACR0                      /* Enable cache */
 388         move.l  #0xff00c000, %d0                /* Setup cache mask */
 389         movec   %d0, %ACR1                      /* Enable cache */
 390         move.l  #0x80000100, %d0                /* Setup cache mask */
 391         movec   %d0, %CACR                      /* Enable cache */
 392         moveq   #1, %d0
 393         move.l  %d0, icache_state
 394         rts
 395 #endif
 396
 397 #ifdef CONFIG_M5282
 398         .globl  icache_enable
 399 icache_enable:
 400         move.l  #0x01000000, %d0                /* Invalidate cache cmd */
 401         movec   %d0, %CACR                      /* Invalidate cache */
 402         move.l  #0x0000c000, %d0                /* Setup cache mask */
 403         movec   %d0, %ACR0                      /* Enable cache */
 404         move.l  #0xff00c000, %d0                /* Setup cache mask */
 405         movec   %d0, %ACR1                      /* Enable cache */
 406         move.l  #0x80400100, %d0                /* Setup cache mask, data cache disabel*/
 407         movec   %d0, %CACR                      /* Enable cache */
 408         moveq   #1, %d0
 409 icache_state_access_1:
 410         move.l  %d0, icache_state
 411         rts
 412 #endif
 413
 414 #if defined(CONFIG_M5249) || defined(CONFIG_M5253)
 415         .globl  icache_enable
 416 icache_enable:
 417         /*
 418          *  Note: The 5249 Documentation doesn't give a bit position for CINV!
 419          *  From the 5272 and the 5307 documentation, I have deduced that it is
 420          *  probably CACR[24]. Should someone say something to Motorola?
 421          *      ~Jeremy
 422          */
 423         move.l  #0x01000000, %d0                /* Invalidate whole cache */
 424         move.c  %d0,%CACR
 425         move.l  #0xff00c000, %d0                /* Set FLASH cachable: always match (SM=0b10) */
 426         move.c  %d0, %ACR0
 427         move.l  #0x0000c000, %d0                /* Set SDRAM cachable: always match (SM=0b10) */
 428         move.c  %d0, %ACR1
 429         move.l  #0x90000200, %d0                /* Set cache enable cmd */
 430         move.c  %d0,%CACR
 431         moveq   #1, %d0
 432         move.l  %d0, icache_state
 433         rts
 434 #endif
 435
 436         .globl  icache_disable
 437 icache_disable:
 438         move.l  #0x00000100, %d0                /* Setup cache mask */
 439         movec   %d0, %CACR                      /* Enable cache */
 440         clr.l   %d0                             /* Setup cache mask */
 441         movec   %d0, %ACR0                      /* Enable cache */
 442         movec   %d0, %ACR1                      /* Enable cache */
 443         moveq   #0, %d0
 444 icache_state_access_2:
 445         move.l  %d0, icache_state
 446         rts
 447
 448         .globl  icache_status
 449 icache_status:
 450 icache_state_access_3:
 451         move.l  #(icache_state), %a0
 452         move.l  (%a0), %d0
 453         rts
 454
 455         .data
 456 icache_state:
 457         .long   0       /* cache is diabled on inirialization */
 458
 459         .globl  dcache_enable
 460 dcache_enable:
 461         /* dummy function */
 462         rts
 463
 464         .globl  dcache_disable
 465 dcache_disable:
 466         /* dummy function */
 467         rts
 468
 469         .globl  dcache_status
 470 dcache_status:
 471         /* dummy function */
 472         rts
 473
 474 /*------------------------------------------------------------------------------*/
 475
 476         .globl  version_string
 477 version_string:
 478         .ascii U_BOOT_VERSION
 479         .ascii " (", __DATE__, " - ", __TIME__, ")"
 480         .ascii CONFIG_IDENT_STRING, "\0"