/* * Copyright (C) 2003 Josef Baumgartner <josef.baumgartner@telex.de> * Based on code from Bernhard Kuhn <bkuhn@metrowerks.com> * * See file CREDITS for list of people who contributed to this * project. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of * the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, * MA 02111-1307 USA */ #include <config.h> #include "version.h" #ifndef CONFIG_IDENT_STRING #define CONFIG_IDENT_STRING "" #endif #define _START _start #define _FAULT _fault #define SAVE_ALL \ move.w #0x2700,%sr; /* disable intrs */ \ subl #60,%sp; /* space for 15 regs */ \ moveml %d0-%d7/%a0-%a6,%sp@; \ #define RESTORE_ALL \ moveml %sp@,%d0-%d7/%a0-%a6; \ addl #60,%sp; /* space for 15 regs */ \ rte /* If we come from a pre-loader we don't need an initial exception * table. */ #if !defined(CONFIG_MONITOR_IS_IN_RAM) .text /* * Vector table. This is used for initial platform startup. * These vectors are to catch any un-intended traps. */ _vectors: .long 0x00000000, _START .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT .long _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT #endif .text .globl _start _start: nop nop move.w #0x2700,%sr /* if we come from a pre-loader we have no exception table and * therefore no VBR to set */ #if !defined(CONFIG_MONITOR_IS_IN_RAM) move.l #CFG_FLASH_BASE, %d0 movec %d0, %VBR #endif #if defined(CONFIG_M5272) || defined(CONFIG_M5249) move.l #(CFG_MBAR + 1), %d0 /* set MBAR address + valid flag */ move.c %d0, %MBAR /*** The 5249 has MBAR2 as well ***/ #ifdef CFG_MBAR2 move.l #(CFG_MBAR2 + 1), %d0 /* Get MBAR2 address */ movec %d0, #0xc0e /* Set MBAR2 */ #endif move.l #(CFG_INIT_RAM_ADDR + 1), %d0 movec %d0, %RAMBAR0 #endif /* #if defined(CONFIG_M5272) || defined(CONFIG_M5249) */ #ifdef CONFIG_M5282 /* Initialize IPSBAR */ move.l #(CFG_MBAR + 1), %d0 /* set IPSBAR address + valid flag */ move.l %d0, 0x40000000 /* Initialize FLASHBAR: locate internal Flash and validate it */ move.l #(CFG_INT_FLASH_BASE + 0x21), %d0 movec %d0, %RAMBAR0 /* Initialize RAMBAR1: locate SRAM and validate it */ move.l #(CFG_INIT_RAM_ADDR + 0x21), %d0 movec %d0, %RAMBAR1 #endif /* invalidate and disable cache */ move.l #0x01000000, %d0 /* Invalidate cache cmd */ movec %d0, %CACR /* Invalidate cache */ move.l #0, %d0 movec %d0, %ACR0 movec %d0, %ACR1 /* set stackpointer to end of internal ram to get some stackspace for the first c-code */ move.l #(CFG_INIT_RAM_ADDR + CFG_INIT_SP_OFFSET), %sp clr.l %sp@- move.l #__got_start, %a5 /* put relocation table address to a5 */ bsr cpu_init_f /* run low-level CPU init code (from flash) */ bsr board_init_f /* run low-level board init code (from flash) */ /* board_init_f() does not return /*------------------------------------------------------------------------------*/ /* * void relocate_code (addr_sp, gd, addr_moni) * * This "function" does not return, instead it continues in RAM * after relocating the monitor code. * * r3 = dest * r4 = src * r5 = length in bytes * r6 = cachelinesize */ .globl relocate_code relocate_code: link.w %a6,#0 move.l 8(%a6), %sp /* set new stack pointer */ move.l 12(%a6), %d0 /* Save copy of Global Data pointer */ move.l 16(%a6), %a0 /* Save copy of Destination Address */ move.l #CFG_MONITOR_BASE, %a1 move.l #__init_end, %a2 move.l %a0, %a3 /* copy the code to RAM */ 1: move.l (%a1)+, (%a3)+ cmp.l %a1,%a2 bgt.s 1b /* * We are done. Do not return, instead branch to second part of board * initialization, now running from RAM. */ move.l %a0, %a1 add.l #(in_ram - CFG_MONITOR_BASE), %a1 jmp (%a1) in_ram: clear_bss: /* * Now clear BSS segment */ move.l %a0, %a1 add.l #(_sbss - CFG_MONITOR_BASE),%a1 move.l %a0, %d1 add.l #(_ebss - CFG_MONITOR_BASE),%d1 6: clr.l (%a1)+ cmp.l %a1,%d1 bgt.s 6b /* * fix got table in RAM */ move.l %a0, %a1 add.l #(__got_start - CFG_MONITOR_BASE),%a1 move.l %a1,%a5 /* * fix got pointer register a5 */ move.l %a0, %a2 add.l #(__got_end - CFG_MONITOR_BASE),%a2 7: move.l (%a1),%d1 sub.l #_start,%d1 add.l %a0,%d1 move.l %d1,(%a1)+ cmp.l %a2, %a1 bne 7b /* calculate relative jump to board_init_r in ram */ move.l %a0, %a1 add.l #(board_init_r - CFG_MONITOR_BASE), %a1 /* set parameters for board_init_r */ move.l %a0,-(%sp) /* dest_addr */ move.l %d0,-(%sp) /* gd */ jsr (%a1) /*------------------------------------------------------------------------------*/ /* exception code */ .globl _fault _fault: jmp _fault .globl _exc_handler _exc_handler: SAVE_ALL movel %sp,%sp@- bsr exc_handler addql #4,%sp RESTORE_ALL .globl _int_handler _int_handler: SAVE_ALL movel %sp,%sp@- bsr int_handler addql #4,%sp RESTORE_ALL /*------------------------------------------------------------------------------*/ /* cache functions */ #ifdef CONFIG_M5272 .globl icache_enable icache_enable: move.l #0x01000000, %d0 /* Invalidate cache cmd */ movec %d0, %CACR /* Invalidate cache */ move.l #0x0000c000, %d0 /* Setup cache mask */ movec %d0, %ACR0 /* Enable cache */ move.l #0xff00c000, %d0 /* Setup cache mask */ movec %d0, %ACR1 /* Enable cache */ move.l #0x80000100, %d0 /* Setup cache mask */ movec %d0, %CACR /* Enable cache */ moveq #1, %d0 move.l %d0, icache_state rts #endif #ifdef CONFIG_M5282 .globl icache_enable icache_enable: move.l #0x01000000, %d0 /* Invalidate cache cmd */ movec %d0, %CACR /* Invalidate cache */ move.l #0x0000c000, %d0 /* Setup cache mask */ movec %d0, %ACR0 /* Enable cache */ move.l #0xff00c000, %d0 /* Setup cache mask */ movec %d0, %ACR1 /* Enable cache */ move.l #0x80400100, %d0 /* Setup cache mask, data cache disabel*/ movec %d0, %CACR /* Enable cache */ moveq #1, %d0 move.l %d0, icache_state rts #endif #ifdef CONFIG_M5249 .globl icache_enable icache_enable: /* * Note: The 5249 Documentation doesn't give a bit position for CINV! * From the 5272 and the 5307 documentation, I have deduced that it is * probably CACR[24]. Should someone say something to Motorola? * ~Jeremy */ move.l #0x01000000, %d0 /* Invalidate whole cache */ move.c %d0,%CACR move.l #0xff00c000, %d0 /* Set FLASH cachable: always match (SM=0b10) */ move.c %d0, %ACR0 move.l #0x0000c000, %d0 /* Set SDRAM cachable: always match (SM=0b10) */ move.c %d0, %ACR1 move.l #0x90000200, %d0 /* Set cache enable cmd */ move.c %d0,%CACR moveq #1, %d0 move.l %d0, icache_state rts #endif .globl icache_disable icache_disable: move.l #0x00000100, %d0 /* Setup cache mask */ movec %d0, %CACR /* Enable cache */ clr.l %d0 /* Setup cache mask */ movec %d0, %ACR0 /* Enable cache */ movec %d0, %ACR1 /* Enable cache */ moveq #0, %d0 move.l %d0, icache_state rts .globl icache_status icache_status: move.l icache_state, %d0 rts .data icache_state: .long 1 /*------------------------------------------------------------------------------*/ .globl version_string version_string: .ascii U_BOOT_VERSION .ascii " (", __DATE__, " - ", __TIME__, ")" .ascii CONFIG_IDENT_STRING, "\0"