diff options
Diffstat (limited to 'include/asm-mips/timex.h')
-rw-r--r-- | include/asm-mips/timex.h | 27 |
1 files changed, 6 insertions, 21 deletions
diff --git a/include/asm-mips/timex.h b/include/asm-mips/timex.h index 87c68ae76ff8..6529704aa73a 100644 --- a/include/asm-mips/timex.h +++ b/include/asm-mips/timex.h | |||
@@ -13,27 +13,12 @@ | |||
13 | #include <asm/mipsregs.h> | 13 | #include <asm/mipsregs.h> |
14 | 14 | ||
15 | /* | 15 | /* |
16 | * This is the frequency of the timer used for Linux's timer interrupt. | 16 | * This is the clock rate of the i8253 PIT. A MIPS system may not have |
17 | * The value should be defined as accurate as possible or under certain | 17 | * a PIT by the symbol is used all over the kernel including some APIs. |
18 | * circumstances Linux timekeeping might become inaccurate or fail. | 18 | * So keeping it defined to the number for the PIT is the only sane thing |
19 | * | 19 | * for now. |
20 | * For many system the exact clockrate of the timer isn't known but due to | ||
21 | * the way this value is used we can get away with a wrong value as long | ||
22 | * as this value is: | ||
23 | * | ||
24 | * - a multiple of HZ | ||
25 | * - a divisor of the actual rate | ||
26 | * | ||
27 | * 500000 is a good such cheat value. | ||
28 | * | ||
29 | * The obscure number 1193182 is the same as used by the original i8254 | ||
30 | * time in legacy PC hardware; the chip unfortunately also found in a | ||
31 | * bunch of MIPS systems. The last remaining user of the i8254 for the | ||
32 | * timer interrupt is the RM200; it's a very standard system so there is | ||
33 | * no reason to make this a separate architecture. | ||
34 | */ | 20 | */ |
35 | 21 | #define CLOCK_TICK_RATE 1193182 | |
36 | #include <timex.h> | ||
37 | 22 | ||
38 | /* | 23 | /* |
39 | * Standard way to access the cycle counter. | 24 | * Standard way to access the cycle counter. |
@@ -50,7 +35,7 @@ typedef unsigned int cycles_t; | |||
50 | 35 | ||
51 | static inline cycles_t get_cycles(void) | 36 | static inline cycles_t get_cycles(void) |
52 | { | 37 | { |
53 | return read_c0_count(); | 38 | return 0; |
54 | } | 39 | } |
55 | 40 | ||
56 | #endif /* __KERNEL__ */ | 41 | #endif /* __KERNEL__ */ |