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1da177e4 LT |
1 | /* |
2 | * Common time prototypes and such for all ppc machines. | |
3 | * | |
4 | * Written by Cort Dougan (cort@fsmlabs.com) to merge | |
5 | * Paul Mackerras' version and mine for PReP and Pmac. | |
6 | */ | |
7 | ||
8 | #ifdef __KERNEL__ | |
9 | #ifndef __ASM_TIME_H__ | |
10 | #define __ASM_TIME_H__ | |
11 | ||
12 | #include <linux/config.h> | |
13 | #include <linux/types.h> | |
14 | #include <linux/rtc.h> | |
15 | #include <linux/threads.h> | |
16 | ||
17 | #include <asm/reg.h> | |
18 | ||
19 | /* time.c */ | |
20 | extern unsigned tb_ticks_per_jiffy; | |
21 | extern unsigned tb_to_us; | |
22 | extern unsigned tb_last_stamp; | |
23 | extern unsigned long disarm_decr[NR_CPUS]; | |
24 | ||
25 | extern void to_tm(int tim, struct rtc_time * tm); | |
26 | extern time_t last_rtc_update; | |
27 | ||
28 | extern void set_dec_cpu6(unsigned int val); | |
29 | ||
30 | int via_calibrate_decr(void); | |
31 | ||
32 | /* Accessor functions for the decrementer register. | |
33 | * The 4xx doesn't even have a decrementer. I tried to use the | |
34 | * generic timer interrupt code, which seems OK, with the 4xx PIT | |
35 | * in auto-reload mode. The problem is PIT stops counting when it | |
36 | * hits zero. If it would wrap, we could use it just like a decrementer. | |
37 | */ | |
38 | static __inline__ unsigned int get_dec(void) | |
39 | { | |
40 | #if defined(CONFIG_40x) | |
41 | return (mfspr(SPRN_PIT)); | |
42 | #else | |
43 | return (mfspr(SPRN_DEC)); | |
44 | #endif | |
45 | } | |
46 | ||
47 | static __inline__ void set_dec(unsigned int val) | |
48 | { | |
49 | #if defined(CONFIG_40x) | |
50 | return; /* Have to let it auto-reload */ | |
51 | #elif defined(CONFIG_8xx_CPU6) | |
52 | set_dec_cpu6(val); | |
53 | #else | |
54 | mtspr(SPRN_DEC, val); | |
55 | #endif | |
56 | } | |
57 | ||
58 | /* Accessor functions for the timebase (RTC on 601) registers. */ | |
59 | /* If one day CONFIG_POWER is added just define __USE_RTC as 1 */ | |
60 | #ifdef CONFIG_6xx | |
33215652 | 61 | extern __inline__ int __attribute_pure__ __USE_RTC(void) { |
1da177e4 LT |
62 | return (mfspr(SPRN_PVR)>>16) == 1; |
63 | } | |
64 | #else | |
65 | #define __USE_RTC() 0 | |
66 | #endif | |
67 | ||
68 | extern __inline__ unsigned long get_tbl(void) { | |
69 | unsigned long tbl; | |
70 | #if defined(CONFIG_403GCX) | |
71 | asm volatile("mfspr %0, 0x3dd" : "=r" (tbl)); | |
72 | #else | |
73 | asm volatile("mftb %0" : "=r" (tbl)); | |
74 | #endif | |
75 | return tbl; | |
76 | } | |
77 | ||
78 | extern __inline__ unsigned long get_tbu(void) { | |
79 | unsigned long tbl; | |
80 | #if defined(CONFIG_403GCX) | |
81 | asm volatile("mfspr %0, 0x3dc" : "=r" (tbl)); | |
82 | #else | |
83 | asm volatile("mftbu %0" : "=r" (tbl)); | |
84 | #endif | |
85 | return tbl; | |
86 | } | |
87 | ||
88 | extern __inline__ void set_tb(unsigned int upper, unsigned int lower) | |
89 | { | |
90 | mtspr(SPRN_TBWL, 0); | |
91 | mtspr(SPRN_TBWU, upper); | |
92 | mtspr(SPRN_TBWL, lower); | |
93 | } | |
94 | ||
95 | extern __inline__ unsigned long get_rtcl(void) { | |
96 | unsigned long rtcl; | |
97 | asm volatile("mfrtcl %0" : "=r" (rtcl)); | |
98 | return rtcl; | |
99 | } | |
100 | ||
101 | extern __inline__ unsigned long get_rtcu(void) | |
102 | { | |
103 | unsigned long rtcu; | |
104 | asm volatile("mfrtcu %0" : "=r" (rtcu)); | |
105 | return rtcu; | |
106 | } | |
107 | ||
108 | extern __inline__ unsigned get_native_tbl(void) { | |
109 | if (__USE_RTC()) | |
110 | return get_rtcl(); | |
111 | else | |
112 | return get_tbl(); | |
113 | } | |
114 | ||
115 | /* On machines with RTC, this function can only be used safely | |
116 | * after the timestamp and for 1 second. It is only used by gettimeofday | |
117 | * however so it should not matter. | |
118 | */ | |
119 | extern __inline__ unsigned tb_ticks_since(unsigned tstamp) { | |
120 | if (__USE_RTC()) { | |
121 | int delta = get_rtcl() - tstamp; | |
122 | return delta<0 ? delta + 1000000000 : delta; | |
123 | } else { | |
124 | return get_tbl() - tstamp; | |
125 | } | |
126 | } | |
127 | ||
128 | #if 0 | |
129 | extern __inline__ unsigned long get_bin_rtcl(void) { | |
130 | unsigned long rtcl, rtcu1, rtcu2; | |
131 | asm volatile("\ | |
132 | 1: mfrtcu %0\n\ | |
133 | mfrtcl %1\n\ | |
134 | mfrtcu %2\n\ | |
135 | cmpw %0,%2\n\ | |
136 | bne- 1b\n" | |
137 | : "=r" (rtcu1), "=r" (rtcl), "=r" (rtcu2) | |
138 | : : "cr0"); | |
139 | return rtcu2*1000000000+rtcl; | |
140 | } | |
141 | ||
142 | extern __inline__ unsigned binary_tbl(void) { | |
143 | if (__USE_RTC()) | |
144 | return get_bin_rtcl(); | |
145 | else | |
146 | return get_tbl(); | |
147 | } | |
148 | #endif | |
149 | ||
150 | /* Use mulhwu to scale processor timebase to timeval */ | |
151 | /* Specifically, this computes (x * y) / 2^32. -- paulus */ | |
152 | #define mulhwu(x,y) \ | |
153 | ({unsigned z; asm ("mulhwu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;}) | |
154 | ||
155 | unsigned mulhwu_scale_factor(unsigned, unsigned); | |
156 | #endif /* __ASM_TIME_H__ */ | |
157 | #endif /* __KERNEL__ */ |