360 lines
7.0 KiB
ArmAsm
360 lines
7.0 KiB
ArmAsm
/*
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* Startup Code for S3C44B0 CPU-core
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*
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* (C) Copyright 2004
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* DAVE Srl
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*
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* http://www.dave-tech.it
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* http://www.wawnet.biz
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* mailto:info@wawnet.biz
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <asm-offsets.h>
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#include <config.h>
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#include <version.h>
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/*
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* Jump vector table
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*/
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.globl _start
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_start: b reset
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add pc, pc, #0x0c000000
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add pc, pc, #0x0c000000
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add pc, pc, #0x0c000000
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add pc, pc, #0x0c000000
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add pc, pc, #0x0c000000
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add pc, pc, #0x0c000000
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add pc, pc, #0x0c000000
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.balignl 16,0xdeadbeef
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/*
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*************************************************************************
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*
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* Startup Code (reset vector)
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*
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* do important init only if we don't start from memory!
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* relocate u-boot to ram
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* setup stack
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* jump to second stage
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*
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*************************************************************************
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*/
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.globl _TEXT_BASE
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_TEXT_BASE:
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.word CONFIG_SYS_TEXT_BASE
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/*
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* These are defined in the board-specific linker script.
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*/
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.globl _bss_start
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_bss_start:
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.word __bss_start
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.globl _bss_end
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_bss_end:
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.word _end
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#ifdef CONFIG_USE_IRQ
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/* IRQ stack memory (calculated at run-time) */
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.globl IRQ_STACK_START
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IRQ_STACK_START:
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.word 0x0badc0de
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/* IRQ stack memory (calculated at run-time) */
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.globl FIQ_STACK_START
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FIQ_STACK_START:
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.word 0x0badc0de
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#endif
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/* IRQ stack memory (calculated at run-time) + 8 bytes */
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.globl IRQ_STACK_START_IN
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IRQ_STACK_START_IN:
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.word 0x0badc0de
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.globl _datarel_start
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_datarel_start:
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.word __datarel_start
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.globl _datarelrolocal_start
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_datarelrolocal_start:
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.word __datarelrolocal_start
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.globl _datarellocal_start
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_datarellocal_start:
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.word __datarellocal_start
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.globl _datarelro_start
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_datarelro_start:
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.word __datarelro_start
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.globl _got_start
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_got_start:
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.word __got_start
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.globl _got_end
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_got_end:
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.word __got_end
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/*
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* the actual reset code
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*/
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reset:
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/*
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* set the cpu to SVC32 mode
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*/
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mrs r0,cpsr
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bic r0,r0,#0x1f
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orr r0,r0,#0xd3
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msr cpsr,r0
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/*
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* we do sys-critical inits only at reboot,
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* not when booting from ram!
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*/
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#ifndef CONFIG_SKIP_LOWLEVEL_INIT
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bl cpu_init_crit
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/*
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* before relocating, we have to setup RAM timing
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* because memory timing is board-dependend, you will
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* find a lowlevel_init.S in your board directory.
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*/
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bl lowlevel_init
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#endif
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/* Set stackpointer in internal RAM to call board_init_f */
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call_board_init_f:
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ldr sp, =(CONFIG_SYS_INIT_SP_ADDR)
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ldr r0,=0x00000000
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bl board_init_f
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/*------------------------------------------------------------------------------*/
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/*
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* void relocate_code (addr_sp, gd, addr_moni)
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*
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* This "function" does not return, instead it continues in RAM
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* after relocating the monitor code.
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*
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*/
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.globl relocate_code
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relocate_code:
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mov r4, r0 /* save addr_sp */
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mov r5, r1 /* save addr of gd */
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mov r6, r2 /* save addr of destination */
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mov r7, r2 /* save addr of destination */
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/* Set up the stack */
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stack_setup:
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mov sp, r4
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adr r0, _start
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ldr r2, _TEXT_BASE
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ldr r3, _bss_start
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sub r2, r3, r2 /* r2 <- size of armboot */
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add r2, r0, r2 /* r2 <- source end address */
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cmp r0, r6
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beq clear_bss
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copy_loop:
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ldmia r0!, {r9-r10} /* copy from source address [r0] */
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stmia r6!, {r9-r10} /* copy to target address [r1] */
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cmp r0, r2 /* until source end address [r2] */
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blo copy_loop
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#ifndef CONFIG_PRELOADER
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/* fix got entries */
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ldr r1, _TEXT_BASE /* Text base */
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mov r0, r7 /* reloc addr */
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ldr r2, _got_start /* addr in Flash */
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ldr r3, _got_end /* addr in Flash */
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sub r3, r3, r1
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add r3, r3, r0
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sub r2, r2, r1
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add r2, r2, r0
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fixloop:
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ldr r4, [r2]
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sub r4, r4, r1
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add r4, r4, r0
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str r4, [r2]
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add r2, r2, #4
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cmp r2, r3
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blo fixloop
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#endif
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/*
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now copy to sram the interrupt vector
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*/
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adr r0, real_vectors
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add r2, r0, #1024
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ldr r1, =0x0c000000
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add r1, r1, #0x08
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vector_copy_loop:
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ldmia r0!, {r3-r10}
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stmia r1!, {r3-r10}
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cmp r0, r2
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blo vector_copy_loop
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clear_bss:
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#ifndef CONFIG_PRELOADER
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ldr r0, _bss_start
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ldr r1, _bss_end
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ldr r3, _TEXT_BASE /* Text base */
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mov r4, r7 /* reloc addr */
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sub r0, r0, r3
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add r0, r0, r4
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sub r1, r1, r3
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add r1, r1, r4
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mov r2, #0x00000000 /* clear */
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clbss_l:str r2, [r0] /* clear loop... */
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add r0, r0, #4
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cmp r0, r1
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bne clbss_l
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bl coloured_LED_init
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bl red_LED_on
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#endif
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/*
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* We are done. Do not return, instead branch to second part of board
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* initialization, now running from RAM.
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*/
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ldr r0, _TEXT_BASE
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ldr r2, _board_init_r
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sub r2, r2, r0
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add r2, r2, r7 /* position from board_init_r in RAM */
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/* setup parameters for board_init_r */
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mov r0, r5 /* gd_t */
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mov r1, r7 /* dest_addr */
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/* jump to it ... */
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mov lr, r2
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mov pc, lr
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_board_init_r: .word board_init_r
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/*
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*************************************************************************
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*
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* CPU_init_critical registers
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*
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* setup important registers
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* setup memory timing
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*
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*************************************************************************
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*/
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#define INTCON (0x01c00000+0x200000)
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#define INTMSK (0x01c00000+0x20000c)
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#define LOCKTIME (0x01c00000+0x18000c)
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#define PLLCON (0x01c00000+0x180000)
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#define CLKCON (0x01c00000+0x180004)
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#define WTCON (0x01c00000+0x130000)
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cpu_init_crit:
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/* disable watch dog */
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ldr r0, =WTCON
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ldr r1, =0x0
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str r1, [r0]
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/*
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* mask all IRQs by clearing all bits in the INTMRs
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*/
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ldr r1,=INTMSK
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ldr r0, =0x03fffeff
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str r0, [r1]
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ldr r1, =INTCON
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ldr r0, =0x05
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str r0, [r1]
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/* Set Clock Control Register */
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ldr r1, =LOCKTIME
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ldrb r0, =800
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strb r0, [r1]
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ldr r1, =PLLCON
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#if CONFIG_S3C44B0_CLOCK_SPEED==66
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ldr r0, =0x34031 /* 66MHz (Quartz=11MHz) */
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#elif CONFIG_S3C44B0_CLOCK_SPEED==75
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ldr r0, =0x610c1 /*B2: Xtal=20mhz Fclk=75MHz */
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#else
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# error CONFIG_S3C44B0_CLOCK_SPEED undefined
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#endif
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str r0, [r1]
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ldr r1,=CLKCON
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ldr r0, =0x7ff8
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str r0, [r1]
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mov pc, lr
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/*************************************************/
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/* interrupt vectors */
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/*************************************************/
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real_vectors:
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b reset
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b undefined_instruction
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b software_interrupt
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b prefetch_abort
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b data_abort
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b not_used
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b irq
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b fiq
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/*************************************************/
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undefined_instruction:
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mov r6, #3
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b reset
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software_interrupt:
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mov r6, #4
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b reset
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prefetch_abort:
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mov r6, #5
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b reset
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data_abort:
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mov r6, #6
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b reset
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not_used:
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/* we *should* never reach this */
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mov r6, #7
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b reset
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irq:
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mov r6, #8
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b reset
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fiq:
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mov r6, #9
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b reset
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