Commit | Line | Data |
---|---|---|
3136254c BH |
1 | #include <linux/kernel.h> |
2 | #include <linux/time.h> | |
3 | #include <linux/timer.h> | |
4 | #include <linux/init.h> | |
5 | #include <linux/rtc.h> | |
6 | #include <linux/delay.h> | |
7 | #include <asm/prom.h> | |
8 | #include <asm/rtas.h> | |
9 | #include <asm/time.h> | |
10 | ||
11 | ||
12 | #define MAX_RTC_WAIT 5000 /* 5 sec */ | |
13 | #define RTAS_CLOCK_BUSY (-2) | |
14 | unsigned long __init rtas_get_boot_time(void) | |
15 | { | |
16 | int ret[8]; | |
507279db JR |
17 | int error; |
18 | unsigned int wait_time; | |
49e16b7b | 19 | u64 max_wait_tb; |
3136254c BH |
20 | |
21 | max_wait_tb = get_tb() + tb_ticks_per_usec * 1000 * MAX_RTC_WAIT; | |
22 | do { | |
23 | error = rtas_call(rtas_token("get-time-of-day"), 0, 8, ret); | |
507279db JR |
24 | |
25 | wait_time = rtas_busy_delay_time(error); | |
26 | if (wait_time) { | |
3136254c BH |
27 | /* This is boot time so we spin. */ |
28 | udelay(wait_time*1000); | |
3136254c | 29 | } |
507279db | 30 | } while (wait_time && (get_tb() < max_wait_tb)); |
3136254c BH |
31 | |
32 | if (error != 0 && printk_ratelimit()) { | |
33 | printk(KERN_WARNING "error: reading the clock failed (%d)\n", | |
34 | error); | |
35 | return 0; | |
36 | } | |
37 | ||
38 | return mktime(ret[0], ret[1], ret[2], ret[3], ret[4], ret[5]); | |
39 | } | |
40 | ||
41 | /* NOTE: get_rtc_time will get an error if executed in interrupt context | |
42 | * and if a delay is needed to read the clock. In this case we just | |
43 | * silently return without updating rtc_tm. | |
44 | */ | |
45 | void rtas_get_rtc_time(struct rtc_time *rtc_tm) | |
46 | { | |
47 | int ret[8]; | |
507279db JR |
48 | int error; |
49 | unsigned int wait_time; | |
49e16b7b | 50 | u64 max_wait_tb; |
3136254c BH |
51 | |
52 | max_wait_tb = get_tb() + tb_ticks_per_usec * 1000 * MAX_RTC_WAIT; | |
53 | do { | |
54 | error = rtas_call(rtas_token("get-time-of-day"), 0, 8, ret); | |
507279db JR |
55 | |
56 | wait_time = rtas_busy_delay_time(error); | |
57 | if (wait_time) { | |
3136254c | 58 | if (in_interrupt() && printk_ratelimit()) { |
0e8ed479 | 59 | memset(rtc_tm, 0, sizeof(struct rtc_time)); |
3136254c BH |
60 | printk(KERN_WARNING "error: reading clock" |
61 | " would delay interrupt\n"); | |
62 | return; /* delay not allowed */ | |
63 | } | |
3136254c | 64 | msleep(wait_time); |
3136254c | 65 | } |
507279db | 66 | } while (wait_time && (get_tb() < max_wait_tb)); |
3136254c BH |
67 | |
68 | if (error != 0 && printk_ratelimit()) { | |
69 | printk(KERN_WARNING "error: reading the clock failed (%d)\n", | |
70 | error); | |
71 | return; | |
72 | } | |
73 | ||
74 | rtc_tm->tm_sec = ret[5]; | |
75 | rtc_tm->tm_min = ret[4]; | |
76 | rtc_tm->tm_hour = ret[3]; | |
77 | rtc_tm->tm_mday = ret[2]; | |
78 | rtc_tm->tm_mon = ret[1] - 1; | |
79 | rtc_tm->tm_year = ret[0] - 1900; | |
80 | } | |
81 | ||
82 | int rtas_set_rtc_time(struct rtc_time *tm) | |
83 | { | |
84 | int error, wait_time; | |
49e16b7b | 85 | u64 max_wait_tb; |
3136254c BH |
86 | |
87 | max_wait_tb = get_tb() + tb_ticks_per_usec * 1000 * MAX_RTC_WAIT; | |
88 | do { | |
89 | error = rtas_call(rtas_token("set-time-of-day"), 7, 1, NULL, | |
90 | tm->tm_year + 1900, tm->tm_mon + 1, | |
91 | tm->tm_mday, tm->tm_hour, tm->tm_min, | |
92 | tm->tm_sec, 0); | |
507279db JR |
93 | |
94 | wait_time = rtas_busy_delay_time(error); | |
95 | if (wait_time) { | |
3136254c BH |
96 | if (in_interrupt()) |
97 | return 1; /* probably decrementer */ | |
3136254c | 98 | msleep(wait_time); |
3136254c | 99 | } |
507279db | 100 | } while (wait_time && (get_tb() < max_wait_tb)); |
3136254c BH |
101 | |
102 | if (error != 0 && printk_ratelimit()) | |
103 | printk(KERN_WARNING "error: setting the clock failed (%d)\n", | |
104 | error); | |
105 | ||
106 | return 0; | |
107 | } |