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9a8fd558 CZ |
1 | /* |
2 | * include/asm-xtensa/timex.h | |
3 | * | |
4 | * This file is subject to the terms and conditions of the GNU General Public | |
5 | * License. See the file "COPYING" in the main directory of this archive | |
6 | * for more details. | |
7 | * | |
8 | * Copyright (C) 2001 - 2005 Tensilica Inc. | |
9 | */ | |
10 | ||
11 | #ifndef _XTENSA_TIMEX_H | |
12 | #define _XTENSA_TIMEX_H | |
13 | ||
14 | #ifdef __KERNEL__ | |
15 | ||
16 | #include <asm/processor.h> | |
17 | #include <linux/stringify.h> | |
18 | ||
19 | #if XCHAL_INT_LEVEL(XCHAL_TIMER0_INTERRUPT) == 1 | |
20 | # define LINUX_TIMER 0 | |
21 | #elif XCHAL_INT_LEVEL(XCHAL_TIMER1_INTERRUPT) == 1 | |
22 | # define LINUX_TIMER 1 | |
23 | #elif XCHAL_INT_LEVEL(XCHAL_TIMER2_INTERRUPT) == 1 | |
24 | # define LINUX_TIMER 2 | |
25 | #else | |
26 | # error "Bad timer number for Linux configurations!" | |
27 | #endif | |
28 | ||
29 | #define LINUX_TIMER_INT XCHAL_TIMER_INTERRUPT(LINUX_TIMER) | |
30 | #define LINUX_TIMER_MASK (1L << LINUX_TIMER_INT) | |
31 | ||
32 | #define CLOCK_TICK_RATE 1193180 /* (everyone is using this value) */ | |
33 | #define CLOCK_TICK_FACTOR 20 /* Factor of both 10^6 and CLOCK_TICK_RATE */ | |
34 | #define FINETUNE ((((((long)LATCH * HZ - CLOCK_TICK_RATE) << SHIFT_HZ) * \ | |
35 | (1000000/CLOCK_TICK_FACTOR) / (CLOCK_TICK_RATE/CLOCK_TICK_FACTOR)) \ | |
36 | << (SHIFT_SCALE-SHIFT_HZ)) / HZ) | |
37 | ||
38 | #ifdef CONFIG_XTENSA_CALIBRATE_CCOUNT | |
39 | extern unsigned long ccount_per_jiffy; | |
40 | extern unsigned long ccount_nsec; | |
41 | #define CCOUNT_PER_JIFFY ccount_per_jiffy | |
42 | #define CCOUNT_NSEC ccount_nsec | |
43 | #else | |
44 | #define CCOUNT_PER_JIFFY (CONFIG_XTENSA_CPU_CLOCK*(1000000UL/HZ)) | |
45 | #define CCOUNT_NSEC (1000000000UL / CONFIG_XTENSA_CPU_CLOCK) | |
46 | #endif | |
47 | ||
48 | ||
49 | typedef unsigned long long cycles_t; | |
50 | ||
51 | /* | |
52 | * Only used for SMP. | |
53 | */ | |
54 | ||
55 | extern cycles_t cacheflush_time; | |
56 | ||
57 | #define get_cycles() (0) | |
58 | ||
59 | ||
60 | /* | |
61 | * Register access. | |
62 | */ | |
63 | ||
64 | #define WSR_CCOUNT(r) __asm__("wsr %0,"__stringify(CCOUNT) :: "a" (r)) | |
65 | #define RSR_CCOUNT(r) __asm__("rsr %0,"__stringify(CCOUNT) : "=a" (r)) | |
66 | #define WSR_CCOMPARE(x,r) __asm__("wsr %0,"__stringify(CCOMPARE_0)"+"__stringify(x) :: "a"(r)) | |
67 | #define RSR_CCOMPARE(x,r) __asm__("rsr %0,"__stringify(CCOMPARE_0)"+"__stringify(x) : "=a"(r)) | |
68 | ||
69 | static inline unsigned long get_ccount (void) | |
70 | { | |
71 | unsigned long ccount; | |
72 | RSR_CCOUNT(ccount); | |
73 | return ccount; | |
74 | } | |
75 | ||
76 | static inline void set_ccount (unsigned long ccount) | |
77 | { | |
78 | WSR_CCOUNT(ccount); | |
79 | } | |
80 | ||
81 | static inline unsigned long get_linux_timer (void) | |
82 | { | |
83 | unsigned ccompare; | |
84 | RSR_CCOMPARE(LINUX_TIMER, ccompare); | |
85 | return ccompare; | |
86 | } | |
87 | ||
88 | static inline void set_linux_timer (unsigned long ccompare) | |
89 | { | |
90 | WSR_CCOMPARE(LINUX_TIMER, ccompare); | |
91 | } | |
92 | ||
93 | #endif /* __KERNEL__ */ | |
94 | #endif /* _XTENSA_TIMEX_H */ |