200 lines
4.7 KiB
ArmAsm
200 lines
4.7 KiB
ArmAsm
/*
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* armboot - Startup Code for XScale CPU-core
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*
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* Copyright (C) 1998 Dan Malek <dmalek@jlc.net>
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* Copyright (C) 1999 Magnus Damm <kieraypc01.p.y.kie.era.ericsson.se>
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* Copyright (C) 2000 Wolfgang Denk <wd@denx.de>
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* Copyright (C) 2001 Alex Zuepke <azu@sysgo.de>
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* Copyright (C) 2001 Marius Groger <mag@sysgo.de>
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* Copyright (C) 2002 Alex Zupke <azu@sysgo.de>
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* Copyright (C) 2002 Gary Jennejohn <garyj@denx.de>
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* Copyright (C) 2002 Kyle Harris <kharris@nexus-tech.net>
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* Copyright (C) 2003 Kai-Uwe Bloem <kai-uwe.bloem@auerswald.de>
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* Copyright (C) 2003 Kshitij <kshitij@ti.com>
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* Copyright (C) 2003 Richard Woodruff <r-woodruff2@ti.com>
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* Copyright (C) 2003 Robert Schwebel <r.schwebel@pengutronix.de>
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* Copyright (C) 2004 Texas Instruments <r-woodruff2@ti.com>
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* Copyright (C) 2010 Marek Vasut <marek.vasut@gmail.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <asm-offsets.h>
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#include <config.h>
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#include <version.h>
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/*
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*************************************************************************
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*
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* Startup Code (reset vector)
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*
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* do important init only if we don't start from memory!
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* setup Memory and board specific bits prior to relocation.
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* relocate armboot to ram
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* setup stack
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*
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*************************************************************************
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*/
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.globl reset
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reset:
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/*
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* set the cpu to SVC32 mode
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*/
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mrs r0,cpsr
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bic r0,r0,#0x1f
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orr r0,r0,#0xd3
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msr cpsr,r0
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#ifndef CONFIG_SKIP_LOWLEVEL_INIT
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bl cpu_init_crit
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#endif
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#ifdef CONFIG_CPU_PXA25X
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bl lock_cache_for_stack
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#endif
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bl _main
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/*------------------------------------------------------------------------------*/
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.globl c_runtime_cpu_setup
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c_runtime_cpu_setup:
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#ifdef CONFIG_CPU_PXA25X
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/*
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* Unlock (actually, disable) the cache now that board_init_f
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* is done. We could do this earlier but we would need to add
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* a new C runtime hook, whereas c_runtime_cpu_setup already
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* exists.
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* As this routine is just a call to cpu_init_crit, let us
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* tail-optimize and do a simple branch here.
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*/
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b cpu_init_crit
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#else
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bx lr
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#endif
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/*
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*************************************************************************
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*
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* CPU_init_critical registers
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*
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* setup important registers
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* setup memory timing
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*
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*************************************************************************
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*/
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#if !defined(CONFIG_SKIP_LOWLEVEL_INIT) || defined(CONFIG_CPU_PXA25X)
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cpu_init_crit:
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/*
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* flush v4 I/D caches
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*/
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mov r0, #0
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mcr p15, 0, r0, c7, c7, 0 /* Invalidate I+D+BTB caches */
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mcr p15, 0, r0, c8, c7, 0 /* Invalidate Unified TLB */
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/*
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* disable MMU stuff and caches
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*/
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mrc p15, 0, r0, c1, c0, 0
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bic r0, r0, #0x00003300 @ clear bits 13:12, 9:8 (--VI --RS)
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bic r0, r0, #0x00000087 @ clear bits 7, 2:0 (B--- -CAM)
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orr r0, r0, #0x00000002 @ set bit 2 (A) Align
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mcr p15, 0, r0, c1, c0, 0
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mov pc, lr /* back to my caller */
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#endif /* !CONFIG_SKIP_LOWLEVEL_INIT || CONFIG_CPU_PXA25X */
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/*
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* Enable MMU to use DCache as DRAM.
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*
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* This is useful on PXA25x and PXA26x in early bootstages, where there is no
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* other possible memory available to hold stack.
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*/
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#ifdef CONFIG_CPU_PXA25X
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.macro CPWAIT reg
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mrc p15, 0, \reg, c2, c0, 0
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mov \reg, \reg
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sub pc, pc, #4
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.endm
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lock_cache_for_stack:
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/* Domain access -- enable for all CPs */
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ldr r0, =0x0000ffff
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mcr p15, 0, r0, c3, c0, 0
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/* Point TTBR to MMU table */
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ldr r0, =mmutable
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mcr p15, 0, r0, c2, c0, 0
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/* Kick in MMU, ICache, DCache, BTB */
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mrc p15, 0, r0, c1, c0, 0
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bic r0, #0x1b00
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bic r0, #0x0087
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orr r0, #0x1800
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orr r0, #0x0005
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mcr p15, 0, r0, c1, c0, 0
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CPWAIT r0
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/* Unlock Icache, Dcache */
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mcr p15, 0, r0, c9, c1, 1
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mcr p15, 0, r0, c9, c2, 1
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/* Flush Icache, Dcache, BTB */
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mcr p15, 0, r0, c7, c7, 0
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/* Unlock I-TLB, D-TLB */
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mcr p15, 0, r0, c10, c4, 1
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mcr p15, 0, r0, c10, c8, 1
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/* Flush TLB */
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mcr p15, 0, r0, c8, c7, 0
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/* Allocate 4096 bytes of Dcache as RAM */
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/* Drain pending loads and stores */
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mcr p15, 0, r0, c7, c10, 4
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mov r4, #0x00
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mov r5, #0x00
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mov r2, #0x01
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mcr p15, 0, r0, c9, c2, 0
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CPWAIT r0
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/* 128 lines reserved (128 x 32bytes = 4096 bytes total) */
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mov r0, #128
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ldr r1, =0xfffff000
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alloc:
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mcr p15, 0, r1, c7, c2, 5
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/* Drain pending loads and stores */
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mcr p15, 0, r0, c7, c10, 4
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strd r4, [r1], #8
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strd r4, [r1], #8
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strd r4, [r1], #8
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strd r4, [r1], #8
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subs r0, #0x01
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bne alloc
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/* Drain pending loads and stores */
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mcr p15, 0, r0, c7, c10, 4
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mov r2, #0x00
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mcr p15, 0, r2, c9, c2, 0
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CPWAIT r0
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mov pc, lr
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.section .mmutable, "a"
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mmutable:
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.align 14
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/* 0x00000000 - 0xffe00000 : 1:1, uncached mapping */
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.set __base, 0
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.rept 0xfff
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.word (__base << 20) | 0xc12
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.set __base, __base + 1
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.endr
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/* 0xfff00000 : 1:1, cached mapping */
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.word (0xfff << 20) | 0x1c1e
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#endif /* CONFIG_CPU_PXA25X */
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