projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1345562b NF |
1 | /* |
| 2 | * reset AT91SAM9G20 as per errata | |
| 3 | * | |
| 4 | * (C) BitBox Ltd 2010 | |
| 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 | * This program is free software; you can redistribute it and/or modify | |
| 11 | * it under the terms of the GNU General Public License as published by | |
| 12 | * the Free Software Foundation; either version 2 of the License, or | |
| 13 | * (at your option) any later version. | |
| 14 | */ | |
| 15 | ||
| 16 | #include <linux/linkage.h> | |
| 1345562b | 17 | #include <mach/hardware.h> |
| f363c407 | 18 | #include <mach/at91_ramc.h> |
| f0995d08 | 19 | #include "at91_rstc.h" |
| 1345562b NF |
20 | |
| 21 | .arm | |
| 22 | ||
| 1b2073e7 | 23 | .globl at91sam9_alt_restart |
| 1345562b | 24 | |
| f363c407 JCPV |
25 | at91sam9_alt_restart: ldr r0, =at91_ramc_base @ preload constants |
| 26 | ldr r0, [r0] | |
| 27 | ldr r4, =at91_rstc_base | |
| 28 | ldr r1, [r4] | |
| 1345562b NF |
29 | |
| 30 | mov r2, #1 | |
| 31 | mov r3, #AT91_SDRAMC_LPCB_POWER_DOWN | |
| 32 | ldr r4, =AT91_RSTC_KEY | AT91_RSTC_PERRST | AT91_RSTC_PROCRST | |
| 33 | ||
| 34 | .balign 32 @ align to cache line | |
| 35 | ||
| 36 | str r2, [r0, #AT91_SDRAMC_TR] @ disable SDRAM access | |
| 37 | str r3, [r0, #AT91_SDRAMC_LPR] @ power down SDRAM | |
| e9f68b5c | 38 | str r4, [r1, #AT91_RSTC_CR] @ reset processor |
| 1345562b NF |
39 | |
| 40 | b . |