184ad6884SPeter Tyser/* 284ad6884SPeter Tyser * armboot - Startup Code for ARM926EJS CPU-core 384ad6884SPeter Tyser * 484ad6884SPeter Tyser * Copyright (c) 2003 Texas Instruments 584ad6884SPeter Tyser * 684ad6884SPeter Tyser * ----- Adapted for OMAP1610 OMAP730 from ARM925t code ------ 784ad6884SPeter Tyser * 884ad6884SPeter Tyser * Copyright (c) 2001 Marius Gr�ger <mag@sysgo.de> 984ad6884SPeter Tyser * Copyright (c) 2002 Alex Z�pke <azu@sysgo.de> 1084ad6884SPeter Tyser * Copyright (c) 2002 Gary Jennejohn <garyj@denx.de> 1184ad6884SPeter Tyser * Copyright (c) 2003 Richard Woodruff <r-woodruff2@ti.com> 1284ad6884SPeter Tyser * Copyright (c) 2003 Kshitij <kshitij@ti.com> 1384ad6884SPeter Tyser * 1484ad6884SPeter Tyser * See file CREDITS for list of people who contributed to this 1584ad6884SPeter Tyser * project. 1684ad6884SPeter Tyser * 1784ad6884SPeter Tyser * This program is free software; you can redistribute it and/or 1884ad6884SPeter Tyser * modify it under the terms of the GNU General Public License as 1984ad6884SPeter Tyser * published by the Free Software Foundation; either version 2 of 2084ad6884SPeter Tyser * the License, or (at your option) any later version. 2184ad6884SPeter Tyser * 2284ad6884SPeter Tyser * This program is distributed in the hope that it will be useful, 2384ad6884SPeter Tyser * but WITHOUT ANY WARRANTY; without even the implied warranty of 2484ad6884SPeter Tyser * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 2584ad6884SPeter Tyser * GNU General Public License for more details. 2684ad6884SPeter Tyser * 2784ad6884SPeter Tyser * You should have received a copy of the GNU General Public License 2884ad6884SPeter Tyser * along with this program; if not, write to the Free Software 2984ad6884SPeter Tyser * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 3084ad6884SPeter Tyser * MA 02111-1307 USA 3184ad6884SPeter Tyser */ 3284ad6884SPeter Tyser 3384ad6884SPeter Tyser 3484ad6884SPeter Tyser#include <config.h> 3584ad6884SPeter Tyser#include <common.h> 3684ad6884SPeter Tyser#include <version.h> 3784ad6884SPeter Tyser 3884ad6884SPeter Tyser#if defined(CONFIG_OMAP1610) 3984ad6884SPeter Tyser#include <./configs/omap1510.h> 4084ad6884SPeter Tyser#elif defined(CONFIG_OMAP730) 4184ad6884SPeter Tyser#include <./configs/omap730.h> 4284ad6884SPeter Tyser#endif 4384ad6884SPeter Tyser 4484ad6884SPeter Tyser/* 4584ad6884SPeter Tyser ************************************************************************* 4684ad6884SPeter Tyser * 4784ad6884SPeter Tyser * Jump vector table as in table 3.1 in [1] 4884ad6884SPeter Tyser * 4984ad6884SPeter Tyser ************************************************************************* 5084ad6884SPeter Tyser */ 5184ad6884SPeter Tyser 5284ad6884SPeter Tyser 5384ad6884SPeter Tyser.globl _start 5484ad6884SPeter Tyser_start: 5584ad6884SPeter Tyser b reset 5684ad6884SPeter Tyser#ifdef CONFIG_PRELOADER 5784ad6884SPeter Tyser/* No exception handlers in preloader */ 5884ad6884SPeter Tyser ldr pc, _hang 5984ad6884SPeter Tyser ldr pc, _hang 6084ad6884SPeter Tyser ldr pc, _hang 6184ad6884SPeter Tyser ldr pc, _hang 6284ad6884SPeter Tyser ldr pc, _hang 6384ad6884SPeter Tyser ldr pc, _hang 6484ad6884SPeter Tyser ldr pc, _hang 6584ad6884SPeter Tyser 6684ad6884SPeter Tyser_hang: 6784ad6884SPeter Tyser .word do_hang 6884ad6884SPeter Tyser/* pad to 64 byte boundary */ 6984ad6884SPeter Tyser .word 0x12345678 7084ad6884SPeter Tyser .word 0x12345678 7184ad6884SPeter Tyser .word 0x12345678 7284ad6884SPeter Tyser .word 0x12345678 7384ad6884SPeter Tyser .word 0x12345678 7484ad6884SPeter Tyser .word 0x12345678 7584ad6884SPeter Tyser .word 0x12345678 7684ad6884SPeter Tyser#else 7784ad6884SPeter Tyser ldr pc, _undefined_instruction 7884ad6884SPeter Tyser ldr pc, _software_interrupt 7984ad6884SPeter Tyser ldr pc, _prefetch_abort 8084ad6884SPeter Tyser ldr pc, _data_abort 8184ad6884SPeter Tyser ldr pc, _not_used 8284ad6884SPeter Tyser ldr pc, _irq 8384ad6884SPeter Tyser ldr pc, _fiq 8484ad6884SPeter Tyser 8584ad6884SPeter Tyser_undefined_instruction: 8684ad6884SPeter Tyser .word undefined_instruction 8784ad6884SPeter Tyser_software_interrupt: 8884ad6884SPeter Tyser .word software_interrupt 8984ad6884SPeter Tyser_prefetch_abort: 9084ad6884SPeter Tyser .word prefetch_abort 9184ad6884SPeter Tyser_data_abort: 9284ad6884SPeter Tyser .word data_abort 9384ad6884SPeter Tyser_not_used: 9484ad6884SPeter Tyser .word not_used 9584ad6884SPeter Tyser_irq: 9684ad6884SPeter Tyser .word irq 9784ad6884SPeter Tyser_fiq: 9884ad6884SPeter Tyser .word fiq 9984ad6884SPeter Tyser 10084ad6884SPeter Tyser#endif /* CONFIG_PRELOADER */ 10184ad6884SPeter Tyser .balignl 16,0xdeadbeef 10284ad6884SPeter Tyser 10384ad6884SPeter Tyser 10484ad6884SPeter Tyser/* 10584ad6884SPeter Tyser ************************************************************************* 10684ad6884SPeter Tyser * 10784ad6884SPeter Tyser * Startup Code (reset vector) 10884ad6884SPeter Tyser * 10984ad6884SPeter Tyser * do important init only if we don't start from memory! 11084ad6884SPeter Tyser * setup Memory and board specific bits prior to relocation. 11184ad6884SPeter Tyser * relocate armboot to ram 11284ad6884SPeter Tyser * setup stack 11384ad6884SPeter Tyser * 11484ad6884SPeter Tyser ************************************************************************* 11584ad6884SPeter Tyser */ 11684ad6884SPeter Tyser 117*ab86f72cSHeiko Schocher.globl _TEXT_BASE 11884ad6884SPeter Tyser_TEXT_BASE: 11984ad6884SPeter Tyser .word TEXT_BASE 12084ad6884SPeter Tyser 121*ab86f72cSHeiko Schocher#if defined(CONFIG_SYS_ARM_WITHOUT_RELOC) 12284ad6884SPeter Tyser.globl _armboot_start 12384ad6884SPeter Tyser_armboot_start: 12484ad6884SPeter Tyser .word _start 125*ab86f72cSHeiko Schocher#endif 12684ad6884SPeter Tyser 12784ad6884SPeter Tyser/* 12884ad6884SPeter Tyser * These are defined in the board-specific linker script. 12984ad6884SPeter Tyser */ 13084ad6884SPeter Tyser.globl _bss_start 13184ad6884SPeter Tyser_bss_start: 13284ad6884SPeter Tyser .word __bss_start 13384ad6884SPeter Tyser 13484ad6884SPeter Tyser.globl _bss_end 13584ad6884SPeter Tyser_bss_end: 13684ad6884SPeter Tyser .word _end 13784ad6884SPeter Tyser 13884ad6884SPeter Tyser#ifdef CONFIG_USE_IRQ 13984ad6884SPeter Tyser/* IRQ stack memory (calculated at run-time) */ 14084ad6884SPeter Tyser.globl IRQ_STACK_START 14184ad6884SPeter TyserIRQ_STACK_START: 14284ad6884SPeter Tyser .word 0x0badc0de 14384ad6884SPeter Tyser 14484ad6884SPeter Tyser/* IRQ stack memory (calculated at run-time) */ 14584ad6884SPeter Tyser.globl FIQ_STACK_START 14684ad6884SPeter TyserFIQ_STACK_START: 14784ad6884SPeter Tyser .word 0x0badc0de 14884ad6884SPeter Tyser#endif 14984ad6884SPeter Tyser 150*ab86f72cSHeiko Schocher#if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC) 151*ab86f72cSHeiko Schocher/* IRQ stack memory (calculated at run-time) + 8 bytes */ 152*ab86f72cSHeiko Schocher.globl IRQ_STACK_START_IN 153*ab86f72cSHeiko SchocherIRQ_STACK_START_IN: 154*ab86f72cSHeiko Schocher .word 0x0badc0de 15584ad6884SPeter Tyser 156*ab86f72cSHeiko Schocher.globl _datarel_start 157*ab86f72cSHeiko Schocher_datarel_start: 158*ab86f72cSHeiko Schocher .word __datarel_start 159*ab86f72cSHeiko Schocher 160*ab86f72cSHeiko Schocher.globl _datarelrolocal_start 161*ab86f72cSHeiko Schocher_datarelrolocal_start: 162*ab86f72cSHeiko Schocher .word __datarelrolocal_start 163*ab86f72cSHeiko Schocher 164*ab86f72cSHeiko Schocher.globl _datarellocal_start 165*ab86f72cSHeiko Schocher_datarellocal_start: 166*ab86f72cSHeiko Schocher .word __datarellocal_start 167*ab86f72cSHeiko Schocher 168*ab86f72cSHeiko Schocher.globl _datarelro_start 169*ab86f72cSHeiko Schocher_datarelro_start: 170*ab86f72cSHeiko Schocher .word __datarelro_start 171*ab86f72cSHeiko Schocher 172*ab86f72cSHeiko Schocher.globl _got_start 173*ab86f72cSHeiko Schocher_got_start: 174*ab86f72cSHeiko Schocher .word __got_start 175*ab86f72cSHeiko Schocher 176*ab86f72cSHeiko Schocher.globl _got_end 177*ab86f72cSHeiko Schocher_got_end: 178*ab86f72cSHeiko Schocher .word __got_end 179*ab86f72cSHeiko Schocher 180*ab86f72cSHeiko Schocher/* 181*ab86f72cSHeiko Schocher * the actual reset code 182*ab86f72cSHeiko Schocher */ 183*ab86f72cSHeiko Schocher 184*ab86f72cSHeiko Schocherreset: 185*ab86f72cSHeiko Schocher /* 186*ab86f72cSHeiko Schocher * set the cpu to SVC32 mode 187*ab86f72cSHeiko Schocher */ 188*ab86f72cSHeiko Schocher mrs r0,cpsr 189*ab86f72cSHeiko Schocher bic r0,r0,#0x1f 190*ab86f72cSHeiko Schocher orr r0,r0,#0xd3 191*ab86f72cSHeiko Schocher msr cpsr,r0 192*ab86f72cSHeiko Schocher 193*ab86f72cSHeiko Schocher /* 194*ab86f72cSHeiko Schocher * we do sys-critical inits only at reboot, 195*ab86f72cSHeiko Schocher * not when booting from ram! 196*ab86f72cSHeiko Schocher */ 197*ab86f72cSHeiko Schocher#ifndef CONFIG_SKIP_LOWLEVEL_INIT 198*ab86f72cSHeiko Schocher bl cpu_init_crit 199*ab86f72cSHeiko Schocher#endif 200*ab86f72cSHeiko Schocher 201*ab86f72cSHeiko Schocher/* Set stackpointer in internal RAM to call board_init_f */ 202*ab86f72cSHeiko Schochercall_board_init_f: 203*ab86f72cSHeiko Schocher ldr sp, =(CONFIG_SYS_INIT_SP_ADDR) 204*ab86f72cSHeiko Schocher ldr r0,=0x00000000 205*ab86f72cSHeiko Schocher bl board_init_f 206*ab86f72cSHeiko Schocher 207*ab86f72cSHeiko Schocher/*------------------------------------------------------------------------------*/ 208*ab86f72cSHeiko Schocher 209*ab86f72cSHeiko Schocher/* 210*ab86f72cSHeiko Schocher * void relocate_code (addr_sp, gd, addr_moni) 211*ab86f72cSHeiko Schocher * 212*ab86f72cSHeiko Schocher * This "function" does not return, instead it continues in RAM 213*ab86f72cSHeiko Schocher * after relocating the monitor code. 214*ab86f72cSHeiko Schocher * 215*ab86f72cSHeiko Schocher */ 216*ab86f72cSHeiko Schocher .globl relocate_code 217*ab86f72cSHeiko Schocherrelocate_code: 218*ab86f72cSHeiko Schocher mov r4, r0 /* save addr_sp */ 219*ab86f72cSHeiko Schocher mov r5, r1 /* save addr of gd */ 220*ab86f72cSHeiko Schocher mov r6, r2 /* save addr of destination */ 221*ab86f72cSHeiko Schocher mov r7, r2 /* save addr of destination */ 222*ab86f72cSHeiko Schocher 223*ab86f72cSHeiko Schocher /* Set up the stack */ 224*ab86f72cSHeiko Schocherstack_setup: 225*ab86f72cSHeiko Schocher mov sp, r4 226*ab86f72cSHeiko Schocher 227*ab86f72cSHeiko Schocher adr r0, _start 228*ab86f72cSHeiko Schocher ldr r2, _TEXT_BASE 229*ab86f72cSHeiko Schocher ldr r3, _bss_start 230*ab86f72cSHeiko Schocher sub r2, r3, r2 /* r2 <- size of armboot */ 231*ab86f72cSHeiko Schocher add r2, r0, r2 /* r2 <- source end address */ 232*ab86f72cSHeiko Schocher cmp r0, r6 233*ab86f72cSHeiko Schocher beq clear_bss 234*ab86f72cSHeiko Schocher 235*ab86f72cSHeiko Schocher#ifndef CONFIG_SKIP_RELOCATE_UBOOT 236*ab86f72cSHeiko Schochercopy_loop: 237*ab86f72cSHeiko Schocher ldmia r0!, {r9-r10} /* copy from source address [r0] */ 238*ab86f72cSHeiko Schocher stmia r6!, {r9-r10} /* copy to target address [r1] */ 239*ab86f72cSHeiko Schocher cmp r0, r2 /* until source end addreee [r2] */ 240*ab86f72cSHeiko Schocher ble copy_loop 241*ab86f72cSHeiko Schocher 242*ab86f72cSHeiko Schocher#ifndef CONFIG_PRELOADER 243*ab86f72cSHeiko Schocher /* fix got entries */ 244*ab86f72cSHeiko Schocher ldr r1, _TEXT_BASE /* Text base */ 245*ab86f72cSHeiko Schocher mov r0, r7 /* reloc addr */ 246*ab86f72cSHeiko Schocher ldr r2, _got_start /* addr in Flash */ 247*ab86f72cSHeiko Schocher ldr r3, _got_end /* addr in Flash */ 248*ab86f72cSHeiko Schocher sub r3, r3, r1 249*ab86f72cSHeiko Schocher add r3, r3, r0 250*ab86f72cSHeiko Schocher sub r2, r2, r1 251*ab86f72cSHeiko Schocher add r2, r2, r0 252*ab86f72cSHeiko Schocher 253*ab86f72cSHeiko Schocherfixloop: 254*ab86f72cSHeiko Schocher ldr r4, [r2] 255*ab86f72cSHeiko Schocher sub r4, r4, r1 256*ab86f72cSHeiko Schocher add r4, r4, r0 257*ab86f72cSHeiko Schocher str r4, [r2] 258*ab86f72cSHeiko Schocher add r2, r2, #4 259*ab86f72cSHeiko Schocher cmp r2, r3 260*ab86f72cSHeiko Schocher bne fixloop 261*ab86f72cSHeiko Schocher#endif 262*ab86f72cSHeiko Schocher#endif /* #ifndef CONFIG_SKIP_RELOCATE_UBOOT */ 263*ab86f72cSHeiko Schocher 264*ab86f72cSHeiko Schocherclear_bss: 265*ab86f72cSHeiko Schocher#ifndef CONFIG_PRELOADER 266*ab86f72cSHeiko Schocher ldr r0, _bss_start 267*ab86f72cSHeiko Schocher ldr r1, _bss_end 268*ab86f72cSHeiko Schocher ldr r3, _TEXT_BASE /* Text base */ 269*ab86f72cSHeiko Schocher mov r4, r7 /* reloc addr */ 270*ab86f72cSHeiko Schocher sub r0, r0, r3 271*ab86f72cSHeiko Schocher add r0, r0, r4 272*ab86f72cSHeiko Schocher sub r1, r1, r3 273*ab86f72cSHeiko Schocher add r1, r1, r4 274*ab86f72cSHeiko Schocher mov r2, #0x00000000 /* clear */ 275*ab86f72cSHeiko Schocher 276*ab86f72cSHeiko Schocherclbss_l:str r2, [r0] /* clear loop... */ 277*ab86f72cSHeiko Schocher add r0, r0, #4 278*ab86f72cSHeiko Schocher cmp r0, r1 279*ab86f72cSHeiko Schocher bne clbss_l 280*ab86f72cSHeiko Schocher 281*ab86f72cSHeiko Schocher bl coloured_LED_init 282*ab86f72cSHeiko Schocher bl red_LED_on 283*ab86f72cSHeiko Schocher#endif 284*ab86f72cSHeiko Schocher 285*ab86f72cSHeiko Schocher/* 286*ab86f72cSHeiko Schocher * We are done. Do not return, instead branch to second part of board 287*ab86f72cSHeiko Schocher * initialization, now running from RAM. 288*ab86f72cSHeiko Schocher */ 289*ab86f72cSHeiko Schocher#ifdef CONFIG_NAND_SPL 290*ab86f72cSHeiko Schocher ldr pc, _nand_boot 291*ab86f72cSHeiko Schocher 292*ab86f72cSHeiko Schocher_nand_boot: .word nand_boot 293*ab86f72cSHeiko Schocher#else 294*ab86f72cSHeiko Schocher ldr r0, _TEXT_BASE 295*ab86f72cSHeiko Schocher ldr r2, _board_init_r 296*ab86f72cSHeiko Schocher sub r2, r2, r0 297*ab86f72cSHeiko Schocher add r2, r2, r7 /* position from board_init_r in RAM */ 298*ab86f72cSHeiko Schocher /* setup parameters for board_init_r */ 299*ab86f72cSHeiko Schocher mov r0, r5 /* gd_t */ 300*ab86f72cSHeiko Schocher mov r1, r7 /* dest_addr */ 301*ab86f72cSHeiko Schocher /* jump to it ... */ 302*ab86f72cSHeiko Schocher mov lr, r2 303*ab86f72cSHeiko Schocher mov pc, lr 304*ab86f72cSHeiko Schocher 305*ab86f72cSHeiko Schocher_board_init_r: .word board_init_r 306*ab86f72cSHeiko Schocher#endif 307*ab86f72cSHeiko Schocher 308*ab86f72cSHeiko Schocher#else /* #if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC) */ 30984ad6884SPeter Tyser/* 31084ad6884SPeter Tyser * the actual reset code 31184ad6884SPeter Tyser */ 31284ad6884SPeter Tyser 31384ad6884SPeter Tyserreset: 31484ad6884SPeter Tyser /* 31584ad6884SPeter Tyser * set the cpu to SVC32 mode 31684ad6884SPeter Tyser */ 31784ad6884SPeter Tyser mrs r0,cpsr 31884ad6884SPeter Tyser bic r0,r0,#0x1f 31984ad6884SPeter Tyser orr r0,r0,#0xd3 32084ad6884SPeter Tyser msr cpsr,r0 32184ad6884SPeter Tyser 32284ad6884SPeter Tyser /* 32384ad6884SPeter Tyser * we do sys-critical inits only at reboot, 32484ad6884SPeter Tyser * not when booting from ram! 32584ad6884SPeter Tyser */ 32684ad6884SPeter Tyser#ifndef CONFIG_SKIP_LOWLEVEL_INIT 32784ad6884SPeter Tyser bl cpu_init_crit 32884ad6884SPeter Tyser#endif 32984ad6884SPeter Tyser 33084ad6884SPeter Tyser#ifndef CONFIG_SKIP_RELOCATE_UBOOT 33184ad6884SPeter Tyserrelocate: /* relocate U-Boot to RAM */ 33284ad6884SPeter Tyser adr r0, _start /* r0 <- current position of code */ 33384ad6884SPeter Tyser ldr r1, _TEXT_BASE /* test if we run from flash or RAM */ 33484ad6884SPeter Tyser cmp r0, r1 /* don't reloc during debug */ 33584ad6884SPeter Tyser beq stack_setup 33684ad6884SPeter Tyser ldr r2, _armboot_start 33784ad6884SPeter Tyser ldr r3, _bss_start 33884ad6884SPeter Tyser sub r2, r3, r2 /* r2 <- size of armboot */ 33984ad6884SPeter Tyser add r2, r0, r2 /* r2 <- source end address */ 34084ad6884SPeter Tyser 34184ad6884SPeter Tysercopy_loop: 34284ad6884SPeter Tyser ldmia r0!, {r3-r10} /* copy from source address [r0] */ 34384ad6884SPeter Tyser stmia r1!, {r3-r10} /* copy to target address [r1] */ 34484ad6884SPeter Tyser cmp r0, r2 /* until source end addreee [r2] */ 34584ad6884SPeter Tyser ble copy_loop 34684ad6884SPeter Tyser#endif /* CONFIG_SKIP_RELOCATE_UBOOT */ 34784ad6884SPeter Tyser 34884ad6884SPeter Tyser /* Set up the stack */ 34984ad6884SPeter Tyserstack_setup: 35084ad6884SPeter Tyser ldr r0, _TEXT_BASE /* upper 128 KiB: relocated uboot */ 35184ad6884SPeter Tyser sub sp, r0, #128 /* leave 32 words for abort-stack */ 35284ad6884SPeter Tyser#ifndef CONFIG_PRELOADER 35384ad6884SPeter Tyser sub r0, r0, #CONFIG_SYS_MALLOC_LEN /* malloc area */ 35484ad6884SPeter Tyser sub r0, r0, #CONFIG_SYS_GBL_DATA_SIZE /* bdinfo */ 35584ad6884SPeter Tyser#ifdef CONFIG_USE_IRQ 35684ad6884SPeter Tyser sub r0, r0, #(CONFIG_STACKSIZE_IRQ+CONFIG_STACKSIZE_FIQ) 35784ad6884SPeter Tyser#endif 35884ad6884SPeter Tyser#endif /* CONFIG_PRELOADER */ 35984ad6884SPeter Tyser sub sp, r0, #12 /* leave 3 words for abort-stack */ 3601a27f7d9SVitaly Kuzmichev bic sp, sp, #7 /* 8-byte alignment for ABI compliance */ 36184ad6884SPeter Tyser 36284ad6884SPeter Tyserclear_bss: 36384ad6884SPeter Tyser ldr r0, _bss_start /* find start of bss segment */ 36484ad6884SPeter Tyser ldr r1, _bss_end /* stop here */ 36584ad6884SPeter Tyser mov r2, #0x00000000 /* clear */ 36684ad6884SPeter Tyser 36784ad6884SPeter Tyser#ifndef CONFIG_PRELOADER 36884ad6884SPeter Tyserclbss_l:str r2, [r0] /* clear loop... */ 36984ad6884SPeter Tyser add r0, r0, #4 37084ad6884SPeter Tyser cmp r0, r1 37184ad6884SPeter Tyser ble clbss_l 37284ad6884SPeter Tyser 37384ad6884SPeter Tyser bl coloured_LED_init 37484ad6884SPeter Tyser bl red_LED_on 37584ad6884SPeter Tyser#endif /* CONFIG_PRELOADER */ 37684ad6884SPeter Tyser 37784ad6884SPeter Tyser ldr pc, _start_armboot 37884ad6884SPeter Tyser 37984ad6884SPeter Tyser_start_armboot: 38084ad6884SPeter Tyser#ifdef CONFIG_NAND_SPL 38184ad6884SPeter Tyser .word nand_boot 38284ad6884SPeter Tyser#else 38384ad6884SPeter Tyser .word start_armboot 38484ad6884SPeter Tyser#endif /* CONFIG_NAND_SPL */ 385*ab86f72cSHeiko Schocher#endif /* #if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC) */ 38684ad6884SPeter Tyser 38784ad6884SPeter Tyser/* 38884ad6884SPeter Tyser ************************************************************************* 38984ad6884SPeter Tyser * 39084ad6884SPeter Tyser * CPU_init_critical registers 39184ad6884SPeter Tyser * 39284ad6884SPeter Tyser * setup important registers 39384ad6884SPeter Tyser * setup memory timing 39484ad6884SPeter Tyser * 39584ad6884SPeter Tyser ************************************************************************* 39684ad6884SPeter Tyser */ 39784ad6884SPeter Tyser#ifndef CONFIG_SKIP_LOWLEVEL_INIT 39884ad6884SPeter Tysercpu_init_crit: 39984ad6884SPeter Tyser /* 40084ad6884SPeter Tyser * flush v4 I/D caches 40184ad6884SPeter Tyser */ 40284ad6884SPeter Tyser mov r0, #0 40384ad6884SPeter Tyser mcr p15, 0, r0, c7, c7, 0 /* flush v3/v4 cache */ 40484ad6884SPeter Tyser mcr p15, 0, r0, c8, c7, 0 /* flush v4 TLB */ 40584ad6884SPeter Tyser 40684ad6884SPeter Tyser /* 40784ad6884SPeter Tyser * disable MMU stuff and caches 40884ad6884SPeter Tyser */ 40984ad6884SPeter Tyser mrc p15, 0, r0, c1, c0, 0 41084ad6884SPeter Tyser bic r0, r0, #0x00002300 /* clear bits 13, 9:8 (--V- --RS) */ 41184ad6884SPeter Tyser bic r0, r0, #0x00000087 /* clear bits 7, 2:0 (B--- -CAM) */ 41284ad6884SPeter Tyser orr r0, r0, #0x00000002 /* set bit 2 (A) Align */ 41384ad6884SPeter Tyser orr r0, r0, #0x00001000 /* set bit 12 (I) I-Cache */ 41484ad6884SPeter Tyser mcr p15, 0, r0, c1, c0, 0 41584ad6884SPeter Tyser 41684ad6884SPeter Tyser /* 41784ad6884SPeter Tyser * Go setup Memory and board specific bits prior to relocation. 41884ad6884SPeter Tyser */ 41984ad6884SPeter Tyser mov ip, lr /* perserve link reg across call */ 42084ad6884SPeter Tyser bl lowlevel_init /* go setup pll,mux,memory */ 42184ad6884SPeter Tyser mov lr, ip /* restore link */ 42284ad6884SPeter Tyser mov pc, lr /* back to my caller */ 42384ad6884SPeter Tyser#endif /* CONFIG_SKIP_LOWLEVEL_INIT */ 42484ad6884SPeter Tyser 42584ad6884SPeter Tyser#ifndef CONFIG_PRELOADER 42684ad6884SPeter Tyser/* 42784ad6884SPeter Tyser ************************************************************************* 42884ad6884SPeter Tyser * 42984ad6884SPeter Tyser * Interrupt handling 43084ad6884SPeter Tyser * 43184ad6884SPeter Tyser ************************************************************************* 43284ad6884SPeter Tyser */ 43384ad6884SPeter Tyser 43484ad6884SPeter Tyser@ 43584ad6884SPeter Tyser@ IRQ stack frame. 43684ad6884SPeter Tyser@ 43784ad6884SPeter Tyser#define S_FRAME_SIZE 72 43884ad6884SPeter Tyser 43984ad6884SPeter Tyser#define S_OLD_R0 68 44084ad6884SPeter Tyser#define S_PSR 64 44184ad6884SPeter Tyser#define S_PC 60 44284ad6884SPeter Tyser#define S_LR 56 44384ad6884SPeter Tyser#define S_SP 52 44484ad6884SPeter Tyser 44584ad6884SPeter Tyser#define S_IP 48 44684ad6884SPeter Tyser#define S_FP 44 44784ad6884SPeter Tyser#define S_R10 40 44884ad6884SPeter Tyser#define S_R9 36 44984ad6884SPeter Tyser#define S_R8 32 45084ad6884SPeter Tyser#define S_R7 28 45184ad6884SPeter Tyser#define S_R6 24 45284ad6884SPeter Tyser#define S_R5 20 45384ad6884SPeter Tyser#define S_R4 16 45484ad6884SPeter Tyser#define S_R3 12 45584ad6884SPeter Tyser#define S_R2 8 45684ad6884SPeter Tyser#define S_R1 4 45784ad6884SPeter Tyser#define S_R0 0 45884ad6884SPeter Tyser 45984ad6884SPeter Tyser#define MODE_SVC 0x13 46084ad6884SPeter Tyser#define I_BIT 0x80 46184ad6884SPeter Tyser 46284ad6884SPeter Tyser/* 46384ad6884SPeter Tyser * use bad_save_user_regs for abort/prefetch/undef/swi ... 46484ad6884SPeter Tyser * use irq_save_user_regs / irq_restore_user_regs for IRQ/FIQ handling 46584ad6884SPeter Tyser */ 46684ad6884SPeter Tyser 46784ad6884SPeter Tyser .macro bad_save_user_regs 46884ad6884SPeter Tyser @ carve out a frame on current user stack 46984ad6884SPeter Tyser sub sp, sp, #S_FRAME_SIZE 47084ad6884SPeter Tyser stmia sp, {r0 - r12} @ Save user registers (now in svc mode) r0-r12 471*ab86f72cSHeiko Schocher#if defined(CONFIG_SYS_ARM_WITHOUT_RELOC) 47284ad6884SPeter Tyser ldr r2, _armboot_start 47384ad6884SPeter Tyser sub r2, r2, #(CONFIG_STACKSIZE+CONFIG_SYS_MALLOC_LEN) 47484ad6884SPeter Tyser sub r2, r2, #(CONFIG_SYS_GBL_DATA_SIZE+8) @ set base 2 words into abort stack 475*ab86f72cSHeiko Schocher#else 476*ab86f72cSHeiko Schocher ldr r2, IRQ_STACK_START_IN 477*ab86f72cSHeiko Schocher#endif 47884ad6884SPeter Tyser @ get values for "aborted" pc and cpsr (into parm regs) 47984ad6884SPeter Tyser ldmia r2, {r2 - r3} 48084ad6884SPeter Tyser add r0, sp, #S_FRAME_SIZE @ grab pointer to old stack 48184ad6884SPeter Tyser add r5, sp, #S_SP 48284ad6884SPeter Tyser mov r1, lr 48384ad6884SPeter Tyser stmia r5, {r0 - r3} @ save sp_SVC, lr_SVC, pc, cpsr 48484ad6884SPeter Tyser mov r0, sp @ save current stack into r0 (param register) 48584ad6884SPeter Tyser .endm 48684ad6884SPeter Tyser 48784ad6884SPeter Tyser .macro irq_save_user_regs 48884ad6884SPeter Tyser sub sp, sp, #S_FRAME_SIZE 48984ad6884SPeter Tyser stmia sp, {r0 - r12} @ Calling r0-r12 49084ad6884SPeter Tyser @ !!!! R8 NEEDS to be saved !!!! a reserved stack spot would be good. 49184ad6884SPeter Tyser add r8, sp, #S_PC 49284ad6884SPeter Tyser stmdb r8, {sp, lr}^ @ Calling SP, LR 49384ad6884SPeter Tyser str lr, [r8, #0] @ Save calling PC 49484ad6884SPeter Tyser mrs r6, spsr 49584ad6884SPeter Tyser str r6, [r8, #4] @ Save CPSR 49684ad6884SPeter Tyser str r0, [r8, #8] @ Save OLD_R0 49784ad6884SPeter Tyser mov r0, sp 49884ad6884SPeter Tyser .endm 49984ad6884SPeter Tyser 50084ad6884SPeter Tyser .macro irq_restore_user_regs 50184ad6884SPeter Tyser ldmia sp, {r0 - lr}^ @ Calling r0 - lr 50284ad6884SPeter Tyser mov r0, r0 50384ad6884SPeter Tyser ldr lr, [sp, #S_PC] @ Get PC 50484ad6884SPeter Tyser add sp, sp, #S_FRAME_SIZE 50584ad6884SPeter Tyser subs pc, lr, #4 @ return & move spsr_svc into cpsr 50684ad6884SPeter Tyser .endm 50784ad6884SPeter Tyser 50884ad6884SPeter Tyser .macro get_bad_stack 509*ab86f72cSHeiko Schocher#if defined(CONFIG_SYS_ARM_WITHOUT_RELOC) 51084ad6884SPeter Tyser ldr r13, _armboot_start @ setup our mode stack 51184ad6884SPeter Tyser sub r13, r13, #(CONFIG_STACKSIZE+CONFIG_SYS_MALLOC_LEN) 51284ad6884SPeter Tyser sub r13, r13, #(CONFIG_SYS_GBL_DATA_SIZE+8) @ reserved a couple spots in abort stack 513*ab86f72cSHeiko Schocher#else 514*ab86f72cSHeiko Schocher ldr r13, IRQ_STACK_START_IN @ setup our mode stack 515*ab86f72cSHeiko Schocher#endif 51684ad6884SPeter Tyser 51784ad6884SPeter Tyser str lr, [r13] @ save caller lr in position 0 of saved stack 51884ad6884SPeter Tyser mrs lr, spsr @ get the spsr 51984ad6884SPeter Tyser str lr, [r13, #4] @ save spsr in position 1 of saved stack 52084ad6884SPeter Tyser mov r13, #MODE_SVC @ prepare SVC-Mode 52184ad6884SPeter Tyser @ msr spsr_c, r13 52284ad6884SPeter Tyser msr spsr, r13 @ switch modes, make sure moves will execute 52384ad6884SPeter Tyser mov lr, pc @ capture return pc 52484ad6884SPeter Tyser movs pc, lr @ jump to next instruction & switch modes. 52584ad6884SPeter Tyser .endm 52684ad6884SPeter Tyser 52784ad6884SPeter Tyser .macro get_irq_stack @ setup IRQ stack 52884ad6884SPeter Tyser ldr sp, IRQ_STACK_START 52984ad6884SPeter Tyser .endm 53084ad6884SPeter Tyser 53184ad6884SPeter Tyser .macro get_fiq_stack @ setup FIQ stack 53284ad6884SPeter Tyser ldr sp, FIQ_STACK_START 53384ad6884SPeter Tyser .endm 53484ad6884SPeter Tyser#endif /* CONFIG_PRELOADER */ 53584ad6884SPeter Tyser 53684ad6884SPeter Tyser/* 53784ad6884SPeter Tyser * exception handlers 53884ad6884SPeter Tyser */ 53984ad6884SPeter Tyser#ifdef CONFIG_PRELOADER 54084ad6884SPeter Tyser .align 5 54184ad6884SPeter Tyserdo_hang: 54284ad6884SPeter Tyser ldr sp, _TEXT_BASE /* switch to abort stack */ 54384ad6884SPeter Tyser1: 54484ad6884SPeter Tyser bl 1b /* hang and never return */ 54584ad6884SPeter Tyser#else /* !CONFIG_PRELOADER */ 54684ad6884SPeter Tyser .align 5 54784ad6884SPeter Tyserundefined_instruction: 54884ad6884SPeter Tyser get_bad_stack 54984ad6884SPeter Tyser bad_save_user_regs 55084ad6884SPeter Tyser bl do_undefined_instruction 55184ad6884SPeter Tyser 55284ad6884SPeter Tyser .align 5 55384ad6884SPeter Tysersoftware_interrupt: 55484ad6884SPeter Tyser get_bad_stack 55584ad6884SPeter Tyser bad_save_user_regs 55684ad6884SPeter Tyser bl do_software_interrupt 55784ad6884SPeter Tyser 55884ad6884SPeter Tyser .align 5 55984ad6884SPeter Tyserprefetch_abort: 56084ad6884SPeter Tyser get_bad_stack 56184ad6884SPeter Tyser bad_save_user_regs 56284ad6884SPeter Tyser bl do_prefetch_abort 56384ad6884SPeter Tyser 56484ad6884SPeter Tyser .align 5 56584ad6884SPeter Tyserdata_abort: 56684ad6884SPeter Tyser get_bad_stack 56784ad6884SPeter Tyser bad_save_user_regs 56884ad6884SPeter Tyser bl do_data_abort 56984ad6884SPeter Tyser 57084ad6884SPeter Tyser .align 5 57184ad6884SPeter Tysernot_used: 57284ad6884SPeter Tyser get_bad_stack 57384ad6884SPeter Tyser bad_save_user_regs 57484ad6884SPeter Tyser bl do_not_used 57584ad6884SPeter Tyser 57684ad6884SPeter Tyser#ifdef CONFIG_USE_IRQ 57784ad6884SPeter Tyser 57884ad6884SPeter Tyser .align 5 57984ad6884SPeter Tyserirq: 58084ad6884SPeter Tyser get_irq_stack 58184ad6884SPeter Tyser irq_save_user_regs 58284ad6884SPeter Tyser bl do_irq 58384ad6884SPeter Tyser irq_restore_user_regs 58484ad6884SPeter Tyser 58584ad6884SPeter Tyser .align 5 58684ad6884SPeter Tyserfiq: 58784ad6884SPeter Tyser get_fiq_stack 58884ad6884SPeter Tyser /* someone ought to write a more effiction fiq_save_user_regs */ 58984ad6884SPeter Tyser irq_save_user_regs 59084ad6884SPeter Tyser bl do_fiq 59184ad6884SPeter Tyser irq_restore_user_regs 59284ad6884SPeter Tyser 59384ad6884SPeter Tyser#else 59484ad6884SPeter Tyser 59584ad6884SPeter Tyser .align 5 59684ad6884SPeter Tyserirq: 59784ad6884SPeter Tyser get_bad_stack 59884ad6884SPeter Tyser bad_save_user_regs 59984ad6884SPeter Tyser bl do_irq 60084ad6884SPeter Tyser 60184ad6884SPeter Tyser .align 5 60284ad6884SPeter Tyserfiq: 60384ad6884SPeter Tyser get_bad_stack 60484ad6884SPeter Tyser bad_save_user_regs 60584ad6884SPeter Tyser bl do_fiq 60684ad6884SPeter Tyser 60784ad6884SPeter Tyser#endif 60884ad6884SPeter Tyser#endif /* CONFIG_PRELOADER */ 609