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786a7674 RH |
1 | /* |
2 | * Copyright 2011 Calxeda, Inc. | |
3 | * Based on PPC version Copyright 2007 MontaVista Software, Inc. | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms and conditions of the GNU General Public License, | |
7 | * version 2, as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License along with | |
15 | * this program. If not, see <http://www.gnu.org/licenses/>. | |
16 | */ | |
17 | #ifndef ASM_EDAC_H | |
18 | #define ASM_EDAC_H | |
19 | /* | |
20 | * ECC atomic, DMA, SMP and interrupt safe scrub function. | |
21 | * Implements the per arch atomic_scrub() that EDAC use for software | |
22 | * ECC scrubbing. It reads memory and then writes back the original | |
23 | * value, allowing the hardware to detect and correct memory errors. | |
24 | */ | |
25 | static inline void atomic_scrub(void *va, u32 size) | |
26 | { | |
27 | #if __LINUX_ARM_ARCH__ >= 6 | |
28 | unsigned int *virt_addr = va; | |
29 | unsigned int temp, temp2; | |
30 | unsigned int i; | |
31 | ||
32 | for (i = 0; i < size / sizeof(*virt_addr); i++, virt_addr++) { | |
33 | /* Very carefully read and write to memory atomically | |
34 | * so we are interrupt, DMA and SMP safe. | |
35 | */ | |
36 | __asm__ __volatile__("\n" | |
37 | "1: ldrex %0, [%2]\n" | |
38 | " strex %1, %0, [%2]\n" | |
39 | " teq %1, #0\n" | |
40 | " bne 1b\n" | |
41 | : "=&r"(temp), "=&r"(temp2) | |
42 | : "r"(virt_addr) | |
43 | : "cc"); | |
44 | } | |
45 | #endif | |
46 | } | |
47 | ||
48 | #endif |