mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-30 05:16:53 +07:00
f363c407b4
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
39 lines
922 B
ArmAsm
39 lines
922 B
ArmAsm
/*
|
|
* reset AT91SAM9G45 as per errata
|
|
*
|
|
* Copyright (C) 2011 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcosoft.com>
|
|
*
|
|
* 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 <linux/linkage.h>
|
|
#include <mach/hardware.h>
|
|
#include <mach/at91_ramc.h>
|
|
#include <mach/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 .
|