diff options
Diffstat (limited to 'arch/arm/mach-tegra/include/mach/delay.h')
-rw-r--r-- | arch/arm/mach-tegra/include/mach/delay.h | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/arch/arm/mach-tegra/include/mach/delay.h b/arch/arm/mach-tegra/include/mach/delay.h new file mode 100644 index 00000000000..2defb7b9b65 --- /dev/null +++ b/arch/arm/mach-tegra/include/mach/delay.h | |||
@@ -0,0 +1,41 @@ | |||
1 | /* | ||
2 | * arch/arm/mach-tegra/include/mach/delay.h | ||
3 | * | ||
4 | * Copyright (C) 2010 Google, Inc. | ||
5 | * | ||
6 | * Author: | ||
7 | * Colin Cross <ccross@google.com> | ||
8 | * | ||
9 | * This software is licensed under the terms of the GNU General Public | ||
10 | * License version 2, as published by the Free Software Foundation, and | ||
11 | * may be copied, distributed, and modified under those terms. | ||
12 | * | ||
13 | * This program is distributed in the hope that it will be useful, | ||
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
16 | * GNU General Public License for more details. | ||
17 | * | ||
18 | */ | ||
19 | #ifndef __MACH_TEGRA_DELAY_H | ||
20 | #define __MACH_TEGRA_DELAY_H | ||
21 | |||
22 | /* needed by loops_per_jiffy calculations */ | ||
23 | extern void __delay(int loops); | ||
24 | |||
25 | extern void __udelay(unsigned long usecs); | ||
26 | extern void __const_udelay(unsigned long usecs); | ||
27 | |||
28 | /* we don't have any restrictions on maximum udelay length, but we'll enforce | ||
29 | * the same restriction as the ARM default so we don't introduce any | ||
30 | * incompatibilties in drivers. | ||
31 | */ | ||
32 | extern void __bad_udelay(void); | ||
33 | |||
34 | #define MAX_UDELAY_MS 2 | ||
35 | |||
36 | #define udelay(n) \ | ||
37 | ((__builtin_constant_p(n) && (n) > (MAX_UDELAY_MS * 1000)) ? \ | ||
38 | __bad_udelay() : \ | ||
39 | __udelay(n)) | ||
40 | |||
41 | #endif /* defined(__MACH_TEGRA_DELAY_H) */ | ||