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/*
* Memory Setup stuff - taken from blob memsetup.S
*
* Copyright (C) 1999 2000 2001 Erik Mouw (J.A.K.Mouw@its.tudelft.nl) and
* Jan-Derk Bakker (J.D.Bakker@its.tudelft.nl)
*
* Copyright (C) 2008 Ronetix Ilko Iliev (www.ronetix.at)
* Copyright (C) 2009 Jean-Christopher PLAGNIOL-VILLARD <plagnioj@jcrosoft.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>
#include <asm/arch/hardware.h>
#include <asm/arch/at91_pmc.h>
#include <asm/arch/at91_pio.h>
#include <asm/arch/at91_rstc.h>
#include <asm/arch/at91_wdt.h>
#include <asm/arch/at91sam9_sdramc.h>
#include <asm/arch/at91sam9_smc.h>
#include <asm/arch/at91sam9261_matrix.h>
_TEXT_BASE:
.word TEXT_BASE
.globl lowlevel_init
.type lowlevel_init,function
lowlevel_init:
mov r5, pc /* r5 = POS1 + 4 current */
POS1:
ldr r0, =POS1 /* r0 = POS1 compile */
ldr r2, _TEXT_BASE
sub r0, r0, r2 /* r0 = POS1-_TEXT_BASE (POS1 relative) */
sub r5, r5, r0 /* r0 = TEXT_BASE-1 */
sub r5, r5, #4 /* r1 = text base - current */
/* memory control configuration 1 */
ldr r0, =SMRDATA
ldr r2, =SMRDATA1
ldr r1, _TEXT_BASE
sub r0, r0, r1
sub r2, r2, r1
add r0, r0, r5
add r2, r2, r5
0:
/* the address */
ldr r1, [r0], #4
/* the value */
ldr r3, [r0], #4
str r3, [r1]
cmp r2, r0
bne 0b
/* ----------------------------------------------------------------------------
* PMC Init Step 1.
* ----------------------------------------------------------------------------
* - Check if the PLL is already initialized
* ----------------------------------------------------------------------------
*/
ldr r1, =(AT91_BASE_SYS + AT91_PMC_MCKR)
ldr r0, [r1]
and r0, r0, #3
cmp r0, #0
bne PLL_setup_end
/* ---------------------------------------------------------------------------
* - Enable the Main Oscillator
* ---------------------------------------------------------------------------
*/
ldr r1, =(AT91_BASE_SYS + AT91_CKGR_MOR)
ldr r2, =(AT91_BASE_SYS + AT91_PMC_SR)
/* Main oscillator Enable register PMC_MOR: */
/* Enable main oscillator, OSCOUNT = 0xFF */
ldr r0, =CONFIG_SYS_MOR_VAL
str r0, [r1]
/* Reading the PMC Status to detect when the Main Oscillator is enabled */
mov r4, #AT91_PMC_MOSCS
MOSCS_Loop:
ldr r3, [r2]
and r3, r4, r3
cmp r3, #AT91_PMC_MOSCS
bne MOSCS_Loop
/* ----------------------------------------------------------------------------
* PMC Init Step 2.
* ----------------------------------------------------------------------------
* Setup PLLA
* ----------------------------------------------------------------------------
*/
ldr r1, =(AT91_BASE_SYS + AT91_CKGR_PLLAR)
ldr r0, =CONFIG_SYS_PLLAR_VAL
str r0, [r1]
/* Reading the PMC Status register to detect when the PLLA is locked */
mov r4, #AT91_PMC_LOCKA
MOSCS_Loop1:
ldr r3, [r2]
and r3, r4, r3
cmp r3, #AT91_PMC_LOCKA
bne MOSCS_Loop1
/* ----------------------------------------------------------------------------
* PMC Init Step 3.
* ----------------------------------------------------------------------------
* - Switch on the Main Oscillator 18.432 MHz
* ----------------------------------------------------------------------------
*/
ldr r1, =(AT91_BASE_SYS + AT91_PMC_MCKR)
/* -Master Clock Controller register PMC_MCKR */
ldr r0, =CONFIG_SYS_MCKR1_VAL
str r0, [r1]
/* Reading the PMC Status to detect when the Master clock is ready */
mov r4, #AT91_PMC_MCKRDY
MCKRDY_Loop:
ldr r3, [r2]
and r3, r4, r3
cmp r3, #AT91_PMC_MCKRDY
bne MCKRDY_Loop
ldr r0, =CONFIG_SYS_MCKR2_VAL
str r0, [r1]
/* Reading the PMC Status to detect when the Master clock is ready */
mov r4, #AT91_PMC_MCKRDY
MCKRDY_Loop1:
ldr r3, [r2]
and r3, r4, r3
cmp r3, #AT91_PMC_MCKRDY
bne MCKRDY_Loop1
PLL_setup_end:
/* ----------------------------------------------------------------------------
* - memory control configuration 2
* ----------------------------------------------------------------------------
*/
ldr r0, =(AT91_BASE_SYS + AT91_SDRAMC_TR)
ldr r1, [r0]
cmp r1, #0
bne SDRAM_setup_end
ldr r0, =SMRDATA1
ldr r2, =SMRDATA2
ldr r1, _TEXT_BASE
sub r0, r0, r1
sub r2, r2, r1
add r0, r0, r5
add r2, r2, r5
2:
/* the address */
ldr r1, [r0], #4
/* the value */
ldr r3, [r0], #4
str r3, [r1]
cmp r2, r0
bne 2b
SDRAM_setup_end:
/* everything is fine now */
mov pc, lr
.ltorg
SMRDATA:
.word (AT91_BASE_SYS + AT91_WDT_MR)
.word CONFIG_SYS_WDTC_WDMR_VAL
.word (AT91_BASE_SYS + AT91_PIOC + PIO_PDR)
.word CONFIG_SYS_PIOC_PDR_VAL1
.word (AT91_BASE_SYS + AT91_PIOC + PIO_PUDR)
.word CONFIG_SYS_PIOC_PPUDR_VAL
.word (AT91_BASE_SYS + AT91_MATRIX_EBICSA)
.word CONFIG_SYS_MATRIX_EBICSA_VAL
/* flash */
.word (AT91_BASE_SYS + AT91_SMC_MODE(0))
.word CONFIG_SYS_SMC0_MODE0_VAL
.word (AT91_BASE_SYS + AT91_SMC_CYCLE(0))
.word CONFIG_SYS_SMC0_CYCLE0_VAL
.word (AT91_BASE_SYS + AT91_SMC_PULSE(0))
.word CONFIG_SYS_SMC0_PULSE0_VAL
.word (AT91_BASE_SYS + AT91_SMC_SETUP(0))
.word CONFIG_SYS_SMC0_SETUP0_VAL
SMRDATA1:
.word (AT91_BASE_SYS + AT91_SDRAMC_MR)
.word CONFIG_SYS_SDRC_MR_VAL1
.word (AT91_BASE_SYS + AT91_SDRAMC_TR)
.word CONFIG_SYS_SDRC_TR_VAL1
.word (AT91_BASE_SYS + AT91_SDRAMC_CR)
.word CONFIG_SYS_SDRC_CR_VAL
.word (AT91_BASE_SYS + AT91_SDRAMC_MDR)
.word CONFIG_SYS_SDRC_MDR_VAL
.word (AT91_BASE_SYS + AT91_SDRAMC_MR)
.word CONFIG_SYS_SDRC_MR_VAL2
.word AT91_SDRAM_BASE
.word CONFIG_SYS_SDRAM_VAL1
.word (AT91_BASE_SYS + AT91_SDRAMC_MR)
.word CONFIG_SYS_SDRC_MR_VAL3
.word AT91_SDRAM_BASE
.word CONFIG_SYS_SDRAM_VAL2
.word AT91_SDRAM_BASE
.word CONFIG_SYS_SDRAM_VAL3
.word AT91_SDRAM_BASE
.word CONFIG_SYS_SDRAM_VAL4
.word AT91_SDRAM_BASE
.word CONFIG_SYS_SDRAM_VAL5
.word AT91_SDRAM_BASE
.word CONFIG_SYS_SDRAM_VAL6
.word AT91_SDRAM_BASE
.word CONFIG_SYS_SDRAM_VAL7
.word AT91_SDRAM_BASE
.word CONFIG_SYS_SDRAM_VAL8
.word AT91_SDRAM_BASE
.word CONFIG_SYS_SDRAM_VAL9
.word (AT91_BASE_SYS + AT91_SDRAMC_MR)
.word CONFIG_SYS_SDRC_MR_VAL4
.word AT91_SDRAM_BASE
.word CONFIG_SYS_SDRAM_VAL10
.word (AT91_BASE_SYS + AT91_SDRAMC_MR)
.word CONFIG_SYS_SDRC_MR_VAL5
.word AT91_SDRAM_BASE
.word CONFIG_SYS_SDRAM_VAL11
.word (AT91_BASE_SYS + AT91_SDRAMC_TR)
.word CONFIG_SYS_SDRC_TR_VAL2
.word AT91_SDRAM_BASE
.word CONFIG_SYS_SDRAM_VAL12
/* User reset enable*/
.word (AT91_BASE_SYS + AT91_RSTC_MR)
.word CONFIG_SYS_RSTC_RMR_VAL
SMRDATA2:
.word 0
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