projects / people / ms / u-boot.git / blame
| Commit | Line | Data |
|---|---|---|
| 98250e8e JS |
1 | /* |
| 2 | * Copyright (C) 1999 2000 2001 Erik Mouw (J.A.K.Mouw@its.tudelft.nl) and | |
| 3 | * Jan-Derk Bakker (J.D.Bakker@its.tudelft.nl) | |
| 4 | * | |
| 5 | * Modified for the at91rm9200dk board by | |
| 6 | * (C) Copyright 2004 | |
| 7 | * Gary Jennejohn, DENX Software Engineering, <garyj@denx.de> | |
| 8 | * | |
| 9 | * See file CREDITS for list of people who contributed to this | |
| 10 | * project. | |
| 11 | * | |
| 12 | * This program is free software; you can redistribute it and/or | |
| 13 | * modify it under the terms of the GNU General Public License as | |
| 14 | * published by the Free Software Foundation; either version 2 of | |
| 15 | * the License, or (at your option) any later version. | |
| 16 | * | |
| 17 | * This program is distributed in the hope that it will be useful, | |
| 18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 20 | * GNU General Public License for more details. | |
| 21 | * | |
| 22 | * You should have received a copy of the GNU General Public License | |
| 23 | * along with this program; if not, write to the Free Software | |
| 24 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, | |
| 25 | * MA 02111-1307 USA | |
| 26 | */ | |
| 27 | ||
| 28 | #include <config.h> | |
| 29 | ||
| 30 | #ifndef CONFIG_SKIP_LOWLEVEL_INIT | |
| 31 | ||
| 32 | #include <asm/arch/hardware.h> | |
| 33 | #include <asm/arch/at91_mc.h> | |
| 34 | #include <asm/arch/at91_pmc.h> | |
| 35 | #include <asm/arch/at91_pio.h> | |
| 36 | ||
| 37 | #define ARM920T_CONTROL 0xC0000000 /* @ set bit 31 (iA) and 30 (nF) */ | |
| 38 | ||
| 39 | _MTEXT_BASE: | |
| 40 | #undef START_FROM_MEM | |
| 41 | #ifdef START_FROM_MEM | |
| 14d0a02a | 42 | .word CONFIG_SYS_TEXT_BASE-PHYS_FLASH_1 |
| 98250e8e | 43 | #else |
| 14d0a02a | 44 | .word CONFIG_SYS_TEXT_BASE |
| 98250e8e JS |
45 | #endif |
| 46 | ||
| 47 | .globl lowlevel_init | |
| 48 | lowlevel_init: | |
| 49 | ldr r1, =AT91_ASM_PMC_MOR | |
| 50 | /* Main oscillator Enable register */ | |
| 51 | #ifdef CONFIG_SYS_USE_MAIN_OSCILLATOR | |
| 52 | ldr r0, =0x0000FF01 /* Enable main oscillator */ | |
| 53 | #else | |
| 54 | ldr r0, =0x0000FF00 /* Disable main oscillator */ | |
| 55 | #endif | |
| 56 | str r0, [r1] /*AT91C_CKGR_MOR] */ | |
| 57 | /* Add loop to compensate Main Oscillator startup time */ | |
| 58 | ldr r0, =0x00000010 | |
| 59 | LoopOsc: | |
| 60 | subs r0, r0, #1 | |
| 61 | bhi LoopOsc | |
| 62 | ||
| 63 | /* memory control configuration */ | |
| 64 | /* this isn't very elegant, but what the heck */ | |
| 65 | ldr r0, =SMRDATA | |
| 66 | ldr r1, _MTEXT_BASE | |
| 67 | sub r0, r0, r1 | |
| 68 | add r2, r0, #80 | |
| 69 | pllloop: | |
| 70 | /* the address */ | |
| 71 | ldr r1, [r0], #4 | |
| 72 | /* the value */ | |
| 73 | ldr r3, [r0], #4 | |
| 74 | str r3, [r1] | |
| 75 | cmp r2, r0 | |
| 76 | bne pllloop | |
| 77 | /* delay - this is all done by guess */ | |
| 78 | ldr r0, =0x00010000 | |
| 79 | /* (vs reading PMC_SR for LOCKA, LOCKB ... or MOSCS earlier) */ | |
| 80 | lock: | |
| 81 | subs r0, r0, #1 | |
| 82 | bhi lock | |
| 83 | ldr r0, =SMRDATA1 | |
| 84 | ldr r1, _MTEXT_BASE | |
| 85 | sub r0, r0, r1 | |
| 86 | add r2, r0, #176 | |
| 87 | sdinit: | |
| 88 | /* the address */ | |
| 89 | ldr r1, [r0], #4 | |
| 90 | /* the value */ | |
| 91 | ldr r3, [r0], #4 | |
| 92 | str r3, [r1] | |
| 93 | cmp r2, r0 | |
| 94 | bne sdinit | |
| 95 | ||
| 96 | /* switch from FastBus to Asynchronous clock mode */ | |
| 97 | mrc p15, 0, r0, c1, c0, 0 | |
| 98 | orr r0, r0, #ARM920T_CONTROL | |
| 99 | mcr p15, 0, r0, c1, c0, 0 | |
| 100 | ||
| 101 | /* everything is fine now */ | |
| 102 | mov pc, lr | |
| 103 | ||
| 104 | .ltorg | |
| 105 | ||
| 106 | SMRDATA: | |
| 107 | .word AT91_ASM_MC_EBI_CFG | |
| 108 | .word CONFIG_SYS_EBI_CFGR_VAL | |
| 109 | .word AT91_ASM_MC_SMC_CSR0 | |
| 110 | .word CONFIG_SYS_SMC_CSR0_VAL | |
| 111 | .word AT91_ASM_PMC_PLLAR | |
| 112 | .word CONFIG_SYS_PLLAR_VAL | |
| 113 | .word AT91_ASM_PMC_PLLBR | |
| 114 | .word CONFIG_SYS_PLLBR_VAL | |
| 115 | .word AT91_ASM_PMC_MCKR | |
| 116 | .word CONFIG_SYS_MCKR_VAL | |
| 117 | /* here there's a delay */ | |
| 118 | SMRDATA1: | |
| 119 | .word AT91_ASM_PIOC_ASR | |
| 120 | .word CONFIG_SYS_PIOC_ASR_VAL | |
| 121 | .word AT91_ASM_PIOC_BSR | |
| 122 | .word CONFIG_SYS_PIOC_BSR_VAL | |
| 123 | .word AT91_ASM_PIOC_PDR | |
| 124 | .word CONFIG_SYS_PIOC_PDR_VAL | |
| 125 | .word AT91_ASM_MC_EBI_CSA | |
| 126 | .word CONFIG_SYS_EBI_CSA_VAL | |
| 127 | .word AT91_ASM_MC_SDRAMC_CR | |
| 128 | .word CONFIG_SYS_SDRC_CR_VAL | |
| 129 | .word AT91_ASM_MC_SDRAMC_MR | |
| 130 | .word CONFIG_SYS_SDRC_MR_VAL | |
| 131 | .word CONFIG_SYS_SDRAM | |
| 132 | .word CONFIG_SYS_SDRAM_VAL | |
| 133 | .word AT91_ASM_MC_SDRAMC_MR | |
| 134 | .word CONFIG_SYS_SDRC_MR_VAL1 | |
| 135 | .word CONFIG_SYS_SDRAM | |
| 136 | .word CONFIG_SYS_SDRAM_VAL | |
| 137 | .word CONFIG_SYS_SDRAM | |
| 138 | .word CONFIG_SYS_SDRAM_VAL | |
| 139 | .word CONFIG_SYS_SDRAM | |
| 140 | .word CONFIG_SYS_SDRAM_VAL | |
| 141 | .word CONFIG_SYS_SDRAM | |
| 142 | .word CONFIG_SYS_SDRAM_VAL | |
| 143 | .word CONFIG_SYS_SDRAM | |
| 144 | .word CONFIG_SYS_SDRAM_VAL | |
| 145 | .word CONFIG_SYS_SDRAM | |
| 146 | .word CONFIG_SYS_SDRAM_VAL | |
| 147 | .word CONFIG_SYS_SDRAM | |
| 148 | .word CONFIG_SYS_SDRAM_VAL | |
| 149 | .word CONFIG_SYS_SDRAM | |
| 150 | .word CONFIG_SYS_SDRAM_VAL | |
| 151 | .word AT91_ASM_MC_SDRAMC_MR | |
| 152 | .word CONFIG_SYS_SDRC_MR_VAL2 | |
| 153 | .word CONFIG_SYS_SDRAM1 | |
| 154 | .word CONFIG_SYS_SDRAM_VAL | |
| 155 | .word AT91_ASM_MC_SDRAMC_TR | |
| 156 | .word CONFIG_SYS_SDRC_TR_VAL | |
| 157 | .word CONFIG_SYS_SDRAM | |
| 158 | .word CONFIG_SYS_SDRAM_VAL | |
| 159 | .word AT91_ASM_MC_SDRAMC_MR | |
| 160 | .word CONFIG_SYS_SDRC_MR_VAL3 | |
| 161 | .word CONFIG_SYS_SDRAM | |
| 162 | .word CONFIG_SYS_SDRAM_VAL | |
| 163 | /* SMRDATA1 is 176 bytes long */ | |
| 164 | #endif /* CONFIG_SKIP_LOWLEVEL_INIT */ |