projects / mirror_ubuntu-zesty-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 14f991a7 JCPV |
1 | /* |
| 2 | * reset AT91SAM9G45 as per errata | |
| 3 | * | |
| 4 | * Copyright (C) 2011 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcosoft.com> | |
| 5 | * | |
| 6 | * unless the SDRAM is cleanly shutdown before we hit the | |
| 7 | * reset register it can be left driving the data bus and | |
| 8 | * killing the chance of a subsequent boot from NAND | |
| 9 | * | |
| 10 | * GPLv2 Only | |
| 11 | */ | |
| 12 | ||
| 13 | #include <linux/linkage.h> | |
| 14 | #include <mach/hardware.h> | |
| f363c407 | 15 | #include <mach/at91_ramc.h> |
| 14f991a7 JCPV |
16 | #include <mach/at91_rstc.h> |
| 17 | ||
| 18 | .arm | |
| 19 | ||
| 20 | .globl at91sam9g45_restart | |
| 21 | ||
| 22 | at91sam9g45_restart: | |
| f363c407 JCPV |
23 | ldr r5, =at91_ramc_base @ preload constants |
| 24 | ldr r0, [r5] | |
| 25 | ldr r4, =at91_rstc_base | |
| 26 | ldr r1, [r4] | |
| 14f991a7 JCPV |
27 | |
| 28 | mov r2, #1 | |
| 29 | mov r3, #AT91_DDRSDRC_LPCB_POWER_DOWN | |
| 30 | ldr r4, =AT91_RSTC_KEY | AT91_RSTC_PERRST | AT91_RSTC_PROCRST | |
| 31 | ||
| 32 | .balign 32 @ align to cache line | |
| 33 | ||
| 34 | str r2, [r0, #AT91_DDRSDRC_RTR] @ disable DDR0 access | |
| 35 | str r3, [r0, #AT91_DDRSDRC_LPR] @ power down DDR0 | |
| 36 | str r4, [r1, #AT91_RSTC_CR] @ reset processor | |
| 37 | ||
| 38 | b . |