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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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1345562b44
Generalize assembler reset routine to allow use on several at91sam9 chips. This patch replace double definitions of SDRAM controller registers and RSTC registers with use of classical header files. For this rework, we remove the not needed icache flush as it is already done in the calling function: arm_machine_restart(). Rename at91sam9g20_reset.S to generalize to several chips. Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
49 lines
1.3 KiB
ArmAsm
49 lines
1.3 KiB
ArmAsm
/*
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* reset AT91SAM9G20 as per errata
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*
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* (C) BitBox Ltd 2010
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*
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* unless the SDRAM is cleanly shutdown before we hit the
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* reset register it can be left driving the data bus and
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* killing the chance of a subsequent boot from NAND
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/linkage.h>
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#include <asm/system.h>
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#include <mach/hardware.h>
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#include <mach/at91sam9_sdramc.h>
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#include <mach/at91_rstc.h>
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.arm
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.globl at91sam9_alt_reset
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at91sam9_alt_reset: mrc p15, 0, r0, c1, c0, 0
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orr r0, r0, #CR_I
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mcr p15, 0, r0, c1, c0, 0 @ enable I-cache
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ldr r0, .at91_va_base_sdramc @ preload constants
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ldr r1, .at91_va_base_rstc_cr
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mov r2, #1
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mov r3, #AT91_SDRAMC_LPCB_POWER_DOWN
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ldr r4, =AT91_RSTC_KEY | AT91_RSTC_PERRST | AT91_RSTC_PROCRST
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.balign 32 @ align to cache line
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str r2, [r0, #AT91_SDRAMC_TR] @ disable SDRAM access
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str r3, [r0, #AT91_SDRAMC_LPR] @ power down SDRAM
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str r4, [r1] @ reset processor
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b .
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.at91_va_base_sdramc:
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.word AT91_VA_BASE_SYS + AT91_SDRAMC0
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.at91_va_base_rstc_cr:
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.word AT91_VA_BASE_SYS + AT91_RSTC_CR
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