| Mike Frysinger | a5384ae | 2010-04-29 01:34:57 -0400 | [diff] [blame] | 1 | /* |
| 2 | * functions for handling bootcount support |
| 3 | * |
| 4 | * Copyright (c) 2010 Analog Devices Inc. |
| 5 | * |
| 6 | * Licensed under the 2-clause BSD. |
| 7 | */ |
| 8 | |
| 9 | /* This version uses one 32bit storage and combines the magic/count */ |
| 10 | |
| 11 | #include <common.h> |
| 12 | |
| 13 | /* We abuse the EVT0 MMR for bootcount storage by default */ |
| 14 | #ifndef CONFIG_SYS_BOOTCOUNT_ADDR |
| 15 | # define CONFIG_SYS_BOOTCOUNT_ADDR EVT0 |
| 16 | #endif |
| 17 | |
| 18 | #define MAGIC_MASK 0xffff0000 |
| 19 | #define COUNT_MASK 0x0000ffff |
| 20 | |
| 21 | void bootcount_store(ulong cnt) |
| 22 | { |
| 23 | ulong magic = (BOOTCOUNT_MAGIC & MAGIC_MASK) | (cnt & COUNT_MASK); |
| 24 | bfin_write32(CONFIG_SYS_BOOTCOUNT_ADDR, magic); |
| 25 | } |
| 26 | |
| 27 | ulong bootcount_load(void) |
| 28 | { |
| 29 | ulong magic = bfin_read32(CONFIG_SYS_BOOTCOUNT_ADDR); |
| 30 | if ((magic & MAGIC_MASK) == (BOOTCOUNT_MAGIC & MAGIC_MASK)) |
| 31 | return magic & COUNT_MASK; |
| 32 | else |
| 33 | return 0; |
| 34 | } |