diff options
Diffstat (limited to 'cpu/arm926ejs/at91/lowlevel_init.S')
| -rw-r--r-- | cpu/arm926ejs/at91/lowlevel_init.S | 278 |
1 files changed, 278 insertions, 0 deletions
diff --git a/cpu/arm926ejs/at91/lowlevel_init.S b/cpu/arm926ejs/at91/lowlevel_init.S new file mode 100644 index 0000000..5ed518c --- /dev/null +++ b/cpu/arm926ejs/at91/lowlevel_init.S @@ -0,0 +1,278 @@ +/* + * 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-Christophe 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_matrix.h> +#include <asm/arch/at91sam9_sdramc.h> +#include <asm/arch/at91sam9_smc.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: */ + 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 + * ---------------------------------------------------------------------------- + */ + 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 + + /* configure PIOx as EBI0 D[16-31] */ +#if defined(CONFIG_AT91SAM9263) + .word (AT91_BASE_SYS + AT91_PIOD + PIO_PDR) + .word CONFIG_SYS_PIOD_PDR_VAL1 + .word (AT91_BASE_SYS + AT91_PIOD + PIO_PUDR) + .word CONFIG_SYS_PIOD_PPUDR_VAL + .word (AT91_BASE_SYS + AT91_PIOD + PIO_ASR) + .word CONFIG_SYS_PIOD_PPUDR_VAL +#elif defined(CONFIG_AT91SAM9261) + .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 +#endif + +#if defined(AT91_MATRIX_EBI0CSA) + .word (AT91_BASE_SYS + AT91_MATRIX_EBI0CSA) + .word CONFIG_SYS_MATRIX_EBI0CSA_VAL +#else /* AT91_MATRIX_EBICSA */ + .word (AT91_BASE_SYS + AT91_MATRIX_EBICSA) + .word CONFIG_SYS_MATRIX_EBICSA_VAL +#endif + + /* 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 +#ifdef CONFIG_SYS_MATRIX_MCFG_REMAP + /* MATRIX_MCFG - REMAP all masters */ + .word (AT91_BASE_SYS + AT91_MATRIX_MCFG0) + .word 0x1FF +#endif + +SMRDATA2: + .word 0 |