From 8e4bff4cab0ddac6060645b0715210484d02ff40 Mon Sep 17 00:00:00 2001 From: Yuval Adam <_@yuv.al> Date: Wed, 30 Aug 2017 08:25:59 +0000 Subject: Initial file dump from open source release --- arch/arm/mach-at91/at91sam9g45_reset.S | 37 ++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) create mode 100644 arch/arm/mach-at91/at91sam9g45_reset.S (limited to 'arch/arm/mach-at91/at91sam9g45_reset.S') diff --git a/arch/arm/mach-at91/at91sam9g45_reset.S b/arch/arm/mach-at91/at91sam9g45_reset.S new file mode 100644 index 00000000..721a1a34 --- /dev/null +++ b/arch/arm/mach-at91/at91sam9g45_reset.S @@ -0,0 +1,37 @@ +/* + * reset AT91SAM9G45 as per errata + * + * Copyright (C) 2011 Jean-Christophe PLAGNIOL-VILLARD + * + * unless the SDRAM is cleanly shutdown before we hit the + * reset register it can be left driving the data bus and + * killing the chance of a subsequent boot from NAND + * + * GPLv2 Only + */ + +#include +#include +#include +#include "at91_rstc.h" + .arm + + .globl at91sam9g45_restart + +at91sam9g45_restart: + ldr r5, =at91_ramc_base @ preload constants + ldr r0, [r5] + ldr r4, =at91_rstc_base + ldr r1, [r4] + + mov r2, #1 + mov r3, #AT91_DDRSDRC_LPCB_POWER_DOWN + ldr r4, =AT91_RSTC_KEY | AT91_RSTC_PERRST | AT91_RSTC_PROCRST + + .balign 32 @ align to cache line + + str r2, [r0, #AT91_DDRSDRC_RTR] @ disable DDR0 access + str r3, [r0, #AT91_DDRSDRC_LPR] @ power down DDR0 + str r4, [r1, #AT91_RSTC_CR] @ reset processor + + b . -- cgit v1.3.1