| * reset AT91SAM9G20 as per errata |
| * 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 |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| #include <linux/linkage.h> |
| #include <mach/hardware.h> |
| #include <mach/at91_ramc.h> |
| .globl at91sam9_alt_restart |
| at91sam9_alt_restart: ldr r0, =at91_ramc_base @ preload constants |
| mov r3, #AT91_SDRAMC_LPCB_POWER_DOWN |
| ldr r4, =AT91_RSTC_KEY | AT91_RSTC_PERRST | AT91_RSTC_PROCRST |
| .balign 32 @ align to cache line |
| str r2, [r0, #AT91_SDRAMC_TR] @ disable SDRAM access |
| str r3, [r0, #AT91_SDRAMC_LPR] @ power down SDRAM |
| str r4, [r1, #AT91_RSTC_CR] @ reset processor |