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Diffstat (limited to 'cpu/pxa/start.S')
| -rw-r--r-- | cpu/pxa/start.S | 498 |
1 files changed, 0 insertions, 498 deletions
diff --git a/cpu/pxa/start.S b/cpu/pxa/start.S deleted file mode 100644 index 63ab0c591a..0000000000 --- a/cpu/pxa/start.S +++ /dev/null @@ -1,498 +0,0 @@ -/* - * armboot - Startup Code for XScale - * - * Copyright (C) 1998 Dan Malek <dmalek@jlc.net> - * Copyright (C) 1999 Magnus Damm <kieraypc01.p.y.kie.era.ericsson.se> - * Copyright (C) 2000 Wolfgang Denk <wd@denx.de> - * Copyright (C) 2001 Alex Zuepke <azu@sysgo.de> - * Copyright (C) 2002 Kyle Harris <kharris@nexus-tech.net> - * Copyright (C) 2003 Robert Schwebel <r.schwebel@pengutronix.de> - * Copyright (C) 2003 Kai-Uwe Bloem <kai-uwe.bloem@auerswald.de> - * - * 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/pxa-regs.h> - -.globl _start -_start: b reset - ldr pc, _undefined_instruction - ldr pc, _software_interrupt - ldr pc, _prefetch_abort - ldr pc, _data_abort - ldr pc, _not_used - ldr pc, _irq - ldr pc, _fiq - -_undefined_instruction: .word undefined_instruction -_software_interrupt: .word software_interrupt -_prefetch_abort: .word prefetch_abort -_data_abort: .word data_abort -_not_used: .word not_used -_irq: .word irq -_fiq: .word fiq - - .balignl 16,0xdeadbeef - - -/* - * Startup Code (reset vector) - * - * do important init only if we don't start from RAM! - * - relocate armboot to RAM - * - setup stack - * - jump to second stage - */ - -_TEXT_BASE: - .word TEXT_BASE - -.globl _armboot_start -_armboot_start: - .word _start - -/* - * These are defined in the board-specific linker script. - */ -.globl _bss_start -_bss_start: - .word __bss_start - -.globl _bss_end -_bss_end: - .word _end - -#ifdef CONFIG_USE_IRQ -/* IRQ stack memory (calculated at run-time) */ -.globl IRQ_STACK_START -IRQ_STACK_START: - .word 0x0badc0de - -/* IRQ stack memory (calculated at run-time) */ -.globl FIQ_STACK_START -FIQ_STACK_START: - .word 0x0badc0de -#endif /* CONFIG_USE_IRQ */ - - -/****************************************************************************/ -/* */ -/* the actual reset code */ -/* */ -/****************************************************************************/ - -reset: - mrs r0,cpsr /* set the CPU to SVC32 mode */ - bic r0,r0,#0x1f /* (superviser mode, M=10011) */ - orr r0,r0,#0x13 - msr cpsr,r0 - - /* - * we do sys-critical inits only at reboot, - * not when booting from RAM! - */ -#ifndef CONFIG_SKIP_LOWLEVEL_INIT - bl cpu_init_crit /* we do sys-critical inits */ -#endif /* !CONFIG_SKIP_LOWLEVEL_INIT */ - -#ifndef CONFIG_SKIP_RELOCATE_UBOOT -relocate: /* relocate U-Boot to RAM */ - adr r0, _start /* r0 <- current position of code */ - ldr r1, _TEXT_BASE /* test if we run from flash or RAM */ - cmp r0, r1 /* don't reloc during debug */ - beq stack_setup - - ldr r2, _armboot_start - ldr r3, _bss_start - sub r2, r3, r2 /* r2 <- size of armboot */ - add r2, r0, r2 /* r2 <- source end address */ - -copy_loop: - ldmia r0!, {r3-r10} /* copy from source address [r0] */ - stmia r1!, {r3-r10} /* copy to target address [r1] */ - cmp r0, r2 /* until source end address [r2] */ - ble copy_loop -#endif /* !CONFIG_SKIP_RELOCATE_UBOOT */ - - /* Set up the stack */ -stack_setup: - ldr r0, _TEXT_BASE /* upper 128 KiB: relocated uboot */ - sub r0, r0, #CONFIG_SYS_MALLOC_LEN /* malloc area */ - sub r0, r0, #CONFIG_SYS_GBL_DATA_SIZE /* bdinfo */ -#ifdef CONFIG_USE_IRQ - sub r0, r0, #(CONFIG_STACKSIZE_IRQ+CONFIG_STACKSIZE_FIQ) -#endif /* CONFIG_USE_IRQ */ - sub sp, r0, #12 /* leave 3 words for abort-stack */ - -clear_bss: - ldr r0, _bss_start /* find start of bss segment */ - ldr r1, _bss_end /* stop here */ - mov r2, #0x00000000 /* clear */ - -clbss_l:str r2, [r0] /* clear loop... */ - add r0, r0, #4 - cmp r0, r1 - ble clbss_l - - ldr pc, _start_armboot - -_start_armboot: .word start_armboot - - -/****************************************************************************/ -/* */ -/* CPU_init_critical registers */ -/* */ -/* - setup important registers */ -/* - setup memory timing */ -/* */ -/****************************************************************************/ -/* mk@tbd: Fix this! */ -#undef RCSR -#undef ICMR -#undef OSMR3 -#undef OSCR -#undef OWER -#undef OIER -#undef CCCR - -/* Interrupt-Controller base address */ -IC_BASE: .word 0x40d00000 -#define ICMR 0x04 - -/* Reset-Controller */ -RST_BASE: .word 0x40f00030 -#define RCSR 0x00 - -/* Operating System Timer */ -OSTIMER_BASE: .word 0x40a00000 -#define OSMR3 0x0C -#define OSCR 0x10 -#define OWER 0x18 -#define OIER 0x1C - -/* Clock Manager Registers */ -#ifdef CONFIG_CPU_MONAHANS -# ifndef CONFIG_SYS_MONAHANS_RUN_MODE_OSC_RATIO -# error "You have to define CONFIG_SYS_MONAHANS_RUN_MODE_OSC_RATIO!!" -# endif /* !CONFIG_SYS_MONAHANS_RUN_MODE_OSC_RATIO */ -# ifndef CONFIG_SYS_MONAHANS_TURBO_RUN_MODE_RATIO -# define CONFIG_SYS_MONAHANS_TURBO_RUN_MODE_RATIO 0x1 -# endif /* !CONFIG_SYS_MONAHANS_TURBO_RUN_MODE_RATIO */ -#else /* !CONFIG_CPU_MONAHANS */ -#ifdef CONFIG_SYS_CPUSPEED -CC_BASE: .word 0x41300000 -#define CCCR 0x00 -cpuspeed: .word CONFIG_SYS_CPUSPEED -#else /* !CONFIG_SYS_CPUSPEED */ -#error "You have to define CONFIG_SYS_CPUSPEED!!" -#endif /* CONFIG_SYS_CPUSPEED */ -#endif /* CONFIG_CPU_MONAHANS */ - - /* takes care the CP15 update has taken place */ - .macro CPWAIT reg - mrc p15,0,\reg,c2,c0,0 - mov \reg,\reg - sub pc,pc,#4 - .endm - -cpu_init_crit: - - /* mask all IRQs */ -#ifndef CONFIG_CPU_MONAHANS - ldr r0, IC_BASE - mov r1, #0x00 - str r1, [r0, #ICMR] -#else /* CONFIG_CPU_MONAHANS */ - /* Step 1 - Enable CP6 permission */ - mrc p15, 0, r1, c15, c1, 0 @ read CPAR - orr r1, r1, #0x40 - mcr p15, 0, r1, c15, c1, 0 - CPWAIT r1 - - /* Step 2 - Mask ICMR & ICMR2 */ - mov r1, #0 - mcr p6, 0, r1, c1, c0, 0 @ ICMR - mcr p6, 0, r1, c7, c0, 0 @ ICMR2 - - /* turn off all clocks but the ones we will definitly require */ - ldr r1, =CKENA - ldr r2, =(CKENA_22_FFUART | CKENA_10_SRAM | CKENA_9_SMC | CKENA_8_DMC) - str r2, [r1] - ldr r1, =CKENB - ldr r2, =(CKENB_6_IRQ) - str r2, [r1] -#endif /* !CONFIG_CPU_MONAHANS */ - - /* set clock speed */ -#ifdef CONFIG_CPU_MONAHANS - ldr r0, =ACCR - ldr r1, =(((CONFIG_SYS_MONAHANS_TURBO_RUN_MODE_RATIO<<8) & ACCR_XN_MASK) | (CONFIG_SYS_MONAHANS_RUN_MODE_OSC_RATIO & ACCR_XL_MASK)) - str r1, [r0] -#else /* !CONFIG_CPU_MONAHANS */ -#ifdef CONFIG_SYS_CPUSPEED - ldr r0, CC_BASE - ldr r1, cpuspeed - str r1, [r0, #CCCR] - mov r0, #2 - mcr p14, 0, r0, c6, c0, 0 - -setspeed_done: - -#endif /* CONFIG_SYS_CPUSPEED */ -#endif /* CONFIG_CPU_MONAHANS */ - - /* - * before relocating, we have to setup RAM timing - * because memory timing is board-dependend, you will - * find a lowlevel_init.S in your board directory. - */ - mov ip, lr - bl lowlevel_init - mov lr, ip - - /* Memory interfaces are working. Disable MMU and enable I-cache. */ - /* mk: hmm, this is not in the monahans docs, leave it now but - * check here if it doesn't work :-) */ - - ldr r0, =0x2001 /* enable access to all coproc. */ - mcr p15, 0, r0, c15, c1, 0 - CPWAIT r0 - - mcr p15, 0, r0, c7, c10, 4 /* drain the write & fill buffers */ - CPWAIT r0 - - mcr p15, 0, r0, c7, c7, 0 /* flush Icache, Dcache and BTB */ - CPWAIT r0 - - mcr p15, 0, r0, c8, c7, 0 /* flush instuction and data TLBs */ - CPWAIT r0 - - /* Enable the Icache */ -/* - mrc p15, 0, r0, c1, c0, 0 - orr r0, r0, #0x1800 - mcr p15, 0, r0, c1, c0, 0 - CPWAIT -*/ - mov pc, lr - - -/****************************************************************************/ -/* */ -/* Interrupt handling */ -/* */ -/****************************************************************************/ - -/* IRQ stack frame */ - -#define S_FRAME_SIZE 72 - -#define S_OLD_R0 68 -#define S_PSR 64 -#define S_PC 60 -#define S_LR 56 -#define S_SP 52 - -#define S_IP 48 -#define S_FP 44 -#define S_R10 40 -#define S_R9 36 -#define S_R8 32 -#define S_R7 28 -#define S_R6 24 -#define S_R5 20 -#define S_R4 16 -#define S_R3 12 -#define S_R2 8 -#define S_R1 4 -#define S_R0 0 - -#define MODE_SVC 0x13 - - /* use bad_save_user_regs for abort/prefetch/undef/swi ... */ - - .macro bad_save_user_regs - sub sp, sp, #S_FRAME_SIZE - stmia sp, {r0 - r12} /* Calling r0-r12 */ - add r8, sp, #S_PC - - ldr r2, _armboot_start - sub r2, r2, #(CONFIG_STACKSIZE+CONFIG_SYS_MALLOC_LEN) - sub r2, r2, #(CONFIG_SYS_GBL_DATA_SIZE+8) @ set base 2 words into abort stack - ldmia r2, {r2 - r4} /* get pc, cpsr, old_r0 */ - add r0, sp, #S_FRAME_SIZE /* restore sp_SVC */ - - add r5, sp, #S_SP - mov r1, lr - stmia r5, {r0 - r4} /* save sp_SVC, lr_SVC, pc, cpsr, old_r */ - mov r0, sp - .endm - - - /* use irq_save_user_regs / irq_restore_user_regs for */ - /* IRQ/FIQ handling */ - - .macro irq_save_user_regs - sub sp, sp, #S_FRAME_SIZE - stmia sp, {r0 - r12} /* Calling r0-r12 */ - add r8, sp, #S_PC - stmdb r8, {sp, lr}^ /* Calling SP, LR */ - str lr, [r8, #0] /* Save calling PC */ - mrs r6, spsr - str r6, [r8, #4] /* Save CPSR */ - str r0, [r8, #8] /* Save OLD_R0 */ - mov r0, sp - .endm - - .macro irq_restore_user_regs - ldmia sp, {r0 - lr}^ @ Calling r0 - lr - mov r0, r0 - ldr lr, [sp, #S_PC] @ Get PC - add sp, sp, #S_FRAME_SIZE - subs pc, lr, #4 @ return & move spsr_svc into cpsr - .endm - - .macro get_bad_stack - ldr r13, _armboot_start @ setup our mode stack - sub r13, r13, #(CONFIG_STACKSIZE+CONFIG_SYS_MALLOC_LEN) - sub r13, r13, #(CONFIG_SYS_GBL_DATA_SIZE+8) @ reserved a couple spots in abort stack - - str lr, [r13] @ save caller lr / spsr - mrs lr, spsr - str lr, [r13, #4] - - mov r13, #MODE_SVC @ prepare SVC-Mode - msr spsr_c, r13 - mov lr, pc - movs pc, lr - .endm - - .macro get_irq_stack @ setup IRQ stack - ldr sp, IRQ_STACK_START - .endm - - .macro get_fiq_stack @ setup FIQ stack - ldr sp, FIQ_STACK_START - .endm - - -/****************************************************************************/ -/* */ -/* exception handlers */ -/* */ -/****************************************************************************/ - - .align 5 -undefined_instruction: - get_bad_stack - bad_save_user_regs - bl do_undefined_instruction - - .align 5 -software_interrupt: - get_bad_stack - bad_save_user_regs - bl do_software_interrupt - - .align 5 -prefetch_abort: - get_bad_stack - bad_save_user_regs - bl do_prefetch_abort - - .align 5 -data_abort: - get_bad_stack - bad_save_user_regs - bl do_data_abort - - .align 5 -not_used: - get_bad_stack - bad_save_user_regs - bl do_not_used - -#ifdef CONFIG_USE_IRQ - - .align 5 -irq: - get_irq_stack - irq_save_user_regs - bl do_irq - irq_restore_user_regs - - .align 5 -fiq: - get_fiq_stack - irq_save_user_regs /* someone ought to write a more */ - bl do_fiq /* effiction fiq_save_user_regs */ - irq_restore_user_regs - -#else /* !CONFIG_USE_IRQ */ - - .align 5 -irq: - get_bad_stack - bad_save_user_regs - bl do_irq - - .align 5 -fiq: - get_bad_stack - bad_save_user_regs - bl do_fiq - -#endif /* CONFIG_USE_IRQ */ - -/****************************************************************************/ -/* */ -/* Reset function: the PXA250 doesn't have a reset function, so we have to */ -/* perform a watchdog timeout for a soft reset. */ -/* */ -/****************************************************************************/ - - .align 5 -.globl reset_cpu - - /* FIXME: this code is PXA250 specific. How is this handled on */ - /* other XScale processors? */ - -reset_cpu: - - /* We set OWE:WME (watchdog enable) and wait until timeout happens */ - - ldr r0, OSTIMER_BASE - ldr r1, [r0, #OWER] - orr r1, r1, #0x0001 /* bit0: WME */ - str r1, [r0, #OWER] - - /* OS timer does only wrap every 1165 seconds, so we have to set */ - /* the match register as well. */ - - ldr r1, [r0, #OSCR] /* read OS timer */ - add r1, r1, #0x800 /* let OSMR3 match after */ - add r1, r1, #0x800 /* 4096*(1/3.6864MHz)=1ms */ - str r1, [r0, #OSMR3] - -reset_endless: - - b reset_endless |
