s3c2800_vector.S revision 1.2
1 /* $NetBSD: s3c2800_vector.S,v 1.2 2005/12/11 12:17:09 christos Exp $ */ 2 3 /* 4 * Copyright (c) 2002, 2003 Fujitsu Component Limited 5 * Copyright (c) 2002, 2003 Genetec Corporation 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of The Fujitsu Component Limited nor the name of 17 * Genetec corporation may not be used to endorse or promote products 18 * derived from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY FUJITSU COMPONENT LIMITED AND GENETEC 21 * CORPORATION ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, 22 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 23 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 24 * DISCLAIMED. IN NO EVENT SHALL FUJITSU COMPONENT LIMITED OR GENETEC 25 * CORPORATION BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 27 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 28 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 29 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 /* 36 * Vector and initialize for S3C2800 based systems. 37 */ 38 39 #include <machine/asm.h> 40 #include <arm/armreg.h> 41 #include <arm/s3c2xx0/s3c2800reg.h> 42 43 #ifndef PLLCON_MDIV_VAL 44 /* constans to get 200MHz FCLK */ 45 #if XTAL_CLK == 10000000 || XTAL_CLK == 10 46 #define PLLCON_MDIV_VAL 0x5c 47 #define PLLCON_PDIV_VAL 3 48 #define PLLCON_SDIV_VAL 0 49 #elif XTAL_CLK == 8000000 || XTAL_CLK == 8 50 #define PLLCON_MDIV_VAL 0x5c 51 #define PLLCON_PDIV_VAL 2 52 #define PLLCON_SDIV_VAL 0 53 #elif XTAL_CLK == 6000000 || XTAL_CLK == 6 54 #define PLLCON_MDIV_VAL 0x5c 55 #define PLLCON_PDIV_VAL 1 56 #define PLLCON_SDIV_VAL 0 57 #else 58 #error define XTAL_CLK to 10, 8 or 6MHz 59 #endif /* XTAL_CLK */ 60 #endif /* PLLCON_MDIV_VAL */ 61 62 #ifndef SDRAM_START 63 #define SDRAM_START S3C2800_DBANK0_START 64 #endif 65 #ifndef SDRAM_SIZE 66 #define SDRAM_SIZE 0x01000000 /* 16MB */ 67 #endif 68 69 #define TEMP_STACK_SIZE (4*1024) 70 71 72 .code 32 73 .section ".vectors" 74 75 reset_vector: 76 b __reset_entry 77 undef: 78 b . 79 swi: 80 b . 81 abrtp: 82 b . 83 abrtd: 84 b . 85 resv: 86 b . 87 irq: 88 b . 89 fiq: 90 b . 91 92 /* 93 * Normally this code lives on ROM and runs immediately after reset, but 94 * it may run on RAM and/or be called after system has been initialized. 95 */ 96 __reset_entry: 97 mrs r0, cpsr 98 /* SVC mode, Disable interrupts */ 99 bic r0, r0, #PSR_MODE 100 orr r0, r0, #(I32_bit|F32_bit|PSR_SVC32_MODE) 101 msr cpsr, r0 102 103 /* Disable MMU, Disable cache */ 104 mrc p15, 0, r10, c1, c0, 0 105 ldr r0, =(CPU_CONTROL_MMU_ENABLE|CPU_CONTROL_DC_ENABLE|CPU_CONTROL_IC_ENABLE) 106 bic r10, r10, r0 107 mcr p15, 0, r10, c1, c0, 0 108 nop 109 nop 110 nop 111 112 /* invalidate I-cache */ 113 mcr p15, 0, r2, c7, c5, 0 114 nop 115 nop 116 nop 117 118 /* Enable I-cache */ 119 orr r10, r10, #CPU_CONTROL_IC_ENABLE 120 mcr p15, 0, r10, c1, c0, 0 121 nop 122 nop 123 nop 124 125 /* Stop WDT */ 126 ldr r0, Lwdt_wtcon_addr 127 mov r1, #WTCON_WDTSTOP 128 str r1, [r0] 129 130 /* Disable all interrupts */ 131 ldr r0, Lintctl_intmsk_addr 132 mov r1, #0x0 133 str r1, [r0] 134 135 #if 0 136 ldr r9, =S3C2800_GPIO_BASE 137 /* LEDs on SMDK2800 */ 138 mov r1, #0x3f 139 strh r1, [r9, #GPIO_PCONC] 140 141 mov r0, #0xdfff /* set PB7 to AHBCLK out */ 142 strh r0, [r9,GPIO_PCONB] 143 #endif 144 145 mov r0, pc 146 cmp r0, #SDRAM_START 147 bhs running_on_ram 148 149 #ifdef RAM_INIT_HOOK 150 bl RAM_INIT_HOOK 151 #endif 152 ldr r8, =S3C2800_CLKMAN_BASE 153 ldr r1, [r8,#CLKMAN_CLKCON] 154 orr r1, r1, #CLKCON_HCLK /* AHB clock = FCLK/2 */ 155 str r1, [r8,#CLKMAN_CLKCON] 156 157 ldr r1, Lclkman_locktime_data 158 str r1, [r8,#CLKMAN_LOCKTIME] 159 160 /* Initialize PLL */ 161 ldr r1, Lclkman_pllcon_data 162 str r1, [r8,#CLKMAN_PLLCON] 163 164 running_on_ram: 165 /* Change Bus mode to Sync */ 166 mrc p15, 0, r0, c1, c0, 0 167 bic r0, r0, #(1<<31) /* unset iA bit */ 168 orr r0, r0, #(1<<30) /* set nF bit */ 169 mcr p15, 0, r0, c1, c0, 0 170 nop 171 nop 172 nop 173 174 /* set temporary stack */ 175 adr sp, reset_vector 176 /* do we have a room below? */ 177 ldr r1, =(SDRAM_START+TEMP_STACK_SIZE) 178 cmp sp, r1 179 /* otherwise use top area of RAM */ 180 ldrlo sp, =(SDRAM_START+SDRAM_SIZE) 181 182 #ifdef IO_INIT_HOOK 183 bl IO_INIT_HOOK 184 #endif 185 #ifdef SELFCOPY_TO_FLASH 186 /* Are we running on RAM? */ 187 mov r0, pc 188 cmp r0, #SDRAM_START 189 blo 99f /* no, skip */ 190 adr r0, reset_vector 191 ldr r1, =__rom_size__ 192 b selfcopy_to_flash 193 99: 194 #endif 195 b start 196 197 Lwdt_wtcon_addr: 198 .word (S3C2800_WDT_BASE + WDT_WTCON) 199 200 Lintctl_intmsk_addr: 201 .word (S3C2800_INTCTL_BASE + INTCTL_INTMSK) 202 203 .ltorg 204 205 Lclkman_locktime_data: 206 .word (0xfff) 207 208 Lclkman_pllcon_data: 209 .word (PLLCON_MDIV_VAL<<PLLCON_MDIV_SHIFT) | \ 210 (PLLCON_PDIV_VAL<<PLLCON_PDIV_SHIFT) | \ 211 (PLLCON_SDIV_VAL<<PLLCON_SDIV_SHIFT) 212 213
Indexes created Mon Sep 29 03:10:08 GMT 2025