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https://github.com/AsahiLinux/u-boot
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164 lines
4.2 KiB
ArmAsm
164 lines
4.2 KiB
ArmAsm
/*
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* Copyright (C) 1999 2000 2001 Erik Mouw (J.A.K.Mouw@its.tudelft.nl) and
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* Jan-Derk Bakker (J.D.Bakker@its.tudelft.nl)
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*
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* Modified for the at91rm9200dk board by
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* (C) Copyright 2004
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* Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
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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 <config.h>
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#ifndef CONFIG_SKIP_LOWLEVEL_INIT
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#include <asm/arch/hardware.h>
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#include <asm/arch/at91_mc.h>
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#include <asm/arch/at91_pmc.h>
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#include <asm/arch/at91_pio.h>
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#define ARM920T_CONTROL 0xC0000000 /* @ set bit 31 (iA) and 30 (nF) */
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_MTEXT_BASE:
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#undef START_FROM_MEM
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#ifdef START_FROM_MEM
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.word TEXT_BASE-PHYS_FLASH_1
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#else
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.word TEXT_BASE
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#endif
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.globl lowlevel_init
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lowlevel_init:
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ldr r1, =AT91_ASM_PMC_MOR
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/* Main oscillator Enable register */
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#ifdef CONFIG_SYS_USE_MAIN_OSCILLATOR
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ldr r0, =0x0000FF01 /* Enable main oscillator */
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#else
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ldr r0, =0x0000FF00 /* Disable main oscillator */
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#endif
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str r0, [r1] /*AT91C_CKGR_MOR] */
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/* Add loop to compensate Main Oscillator startup time */
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ldr r0, =0x00000010
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LoopOsc:
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subs r0, r0, #1
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bhi LoopOsc
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/* memory control configuration */
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/* this isn't very elegant, but what the heck */
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ldr r0, =SMRDATA
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ldr r1, _MTEXT_BASE
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sub r0, r0, r1
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add r2, r0, #80
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pllloop:
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/* the address */
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ldr r1, [r0], #4
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/* the value */
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ldr r3, [r0], #4
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str r3, [r1]
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cmp r2, r0
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bne pllloop
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/* delay - this is all done by guess */
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ldr r0, =0x00010000
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/* (vs reading PMC_SR for LOCKA, LOCKB ... or MOSCS earlier) */
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lock:
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subs r0, r0, #1
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bhi lock
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ldr r0, =SMRDATA1
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ldr r1, _MTEXT_BASE
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sub r0, r0, r1
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add r2, r0, #176
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sdinit:
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/* the address */
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ldr r1, [r0], #4
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/* the value */
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ldr r3, [r0], #4
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str r3, [r1]
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cmp r2, r0
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bne sdinit
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/* switch from FastBus to Asynchronous clock mode */
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mrc p15, 0, r0, c1, c0, 0
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orr r0, r0, #ARM920T_CONTROL
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mcr p15, 0, r0, c1, c0, 0
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/* everything is fine now */
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mov pc, lr
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.ltorg
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SMRDATA:
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.word AT91_ASM_MC_EBI_CFG
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.word CONFIG_SYS_EBI_CFGR_VAL
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.word AT91_ASM_MC_SMC_CSR0
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.word CONFIG_SYS_SMC_CSR0_VAL
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.word AT91_ASM_PMC_PLLAR
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.word CONFIG_SYS_PLLAR_VAL
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.word AT91_ASM_PMC_PLLBR
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.word CONFIG_SYS_PLLBR_VAL
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.word AT91_ASM_PMC_MCKR
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.word CONFIG_SYS_MCKR_VAL
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/* here there's a delay */
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SMRDATA1:
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.word AT91_ASM_PIOC_ASR
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.word CONFIG_SYS_PIOC_ASR_VAL
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.word AT91_ASM_PIOC_BSR
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.word CONFIG_SYS_PIOC_BSR_VAL
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.word AT91_ASM_PIOC_PDR
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.word CONFIG_SYS_PIOC_PDR_VAL
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.word AT91_ASM_MC_EBI_CSA
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.word CONFIG_SYS_EBI_CSA_VAL
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.word AT91_ASM_MC_SDRAMC_CR
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.word CONFIG_SYS_SDRC_CR_VAL
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.word AT91_ASM_MC_SDRAMC_MR
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.word CONFIG_SYS_SDRC_MR_VAL
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.word CONFIG_SYS_SDRAM
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.word CONFIG_SYS_SDRAM_VAL
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.word AT91_ASM_MC_SDRAMC_MR
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.word CONFIG_SYS_SDRC_MR_VAL1
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.word CONFIG_SYS_SDRAM
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.word CONFIG_SYS_SDRAM_VAL
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.word CONFIG_SYS_SDRAM
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.word CONFIG_SYS_SDRAM_VAL
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.word CONFIG_SYS_SDRAM
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.word CONFIG_SYS_SDRAM_VAL
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.word CONFIG_SYS_SDRAM
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.word CONFIG_SYS_SDRAM_VAL
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.word CONFIG_SYS_SDRAM
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.word CONFIG_SYS_SDRAM_VAL
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.word CONFIG_SYS_SDRAM
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.word CONFIG_SYS_SDRAM_VAL
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.word CONFIG_SYS_SDRAM
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.word CONFIG_SYS_SDRAM_VAL
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.word CONFIG_SYS_SDRAM
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.word CONFIG_SYS_SDRAM_VAL
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.word AT91_ASM_MC_SDRAMC_MR
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.word CONFIG_SYS_SDRC_MR_VAL2
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.word CONFIG_SYS_SDRAM1
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.word CONFIG_SYS_SDRAM_VAL
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.word AT91_ASM_MC_SDRAMC_TR
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.word CONFIG_SYS_SDRC_TR_VAL
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.word CONFIG_SYS_SDRAM
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.word CONFIG_SYS_SDRAM_VAL
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.word AT91_ASM_MC_SDRAMC_MR
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.word CONFIG_SYS_SDRC_MR_VAL3
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.word CONFIG_SYS_SDRAM
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.word CONFIG_SYS_SDRAM_VAL
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/* SMRDATA1 is 176 bytes long */
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#endif /* CONFIG_SKIP_LOWLEVEL_INIT */
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