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> | |
9a8f99fa | 7 | #include <linux/ratelimit.h> |
3136254c BH |
8 | #include <asm/prom.h> |
9 | #include <asm/rtas.h> | |
10 | #include <asm/time.h> | |
11 | ||
12 | ||
13 | #define MAX_RTC_WAIT 5000 /* 5 sec */ | |
14 | #define RTAS_CLOCK_BUSY (-2) | |
15 | unsigned long __init rtas_get_boot_time(void) | |
16 | { | |
17 | int ret[8]; | |
507279db JR |
18 | int error; |
19 | unsigned int wait_time; | |
49e16b7b | 20 | u64 max_wait_tb; |
3136254c BH |
21 | |
22 | max_wait_tb = get_tb() + tb_ticks_per_usec * 1000 * MAX_RTC_WAIT; | |
23 | do { | |
24 | error = rtas_call(rtas_token("get-time-of-day"), 0, 8, ret); | |
507279db JR |
25 | |
26 | wait_time = rtas_busy_delay_time(error); | |
27 | if (wait_time) { | |
3136254c BH |
28 | /* This is boot time so we spin. */ |
29 | udelay(wait_time*1000); | |
3136254c | 30 | } |
507279db | 31 | } while (wait_time && (get_tb() < max_wait_tb)); |
3136254c | 32 | |
9a8f99fa CD |
33 | if (error != 0) { |
34 | printk_ratelimited(KERN_WARNING | |
35 | "error: reading the clock failed (%d)\n", | |
36 | error); | |
3136254c BH |
37 | return 0; |
38 | } | |
39 | ||
40 | return mktime(ret[0], ret[1], ret[2], ret[3], ret[4], ret[5]); | |
41 | } | |
42 | ||
43 | /* NOTE: get_rtc_time will get an error if executed in interrupt context | |
44 | * and if a delay is needed to read the clock. In this case we just | |
45 | * silently return without updating rtc_tm. | |
46 | */ | |
47 | void rtas_get_rtc_time(struct rtc_time *rtc_tm) | |
48 | { | |
49 | int ret[8]; | |
507279db JR |
50 | int error; |
51 | unsigned int wait_time; | |
49e16b7b | 52 | u64 max_wait_tb; |
3136254c BH |
53 | |
54 | max_wait_tb = get_tb() + tb_ticks_per_usec * 1000 * MAX_RTC_WAIT; | |
55 | do { | |
56 | error = rtas_call(rtas_token("get-time-of-day"), 0, 8, ret); | |
507279db JR |
57 | |
58 | wait_time = rtas_busy_delay_time(error); | |
59 | if (wait_time) { | |
9a8f99fa | 60 | if (in_interrupt()) { |
0e8ed479 | 61 | memset(rtc_tm, 0, sizeof(struct rtc_time)); |
9a8f99fa CD |
62 | printk_ratelimited(KERN_WARNING |
63 | "error: reading clock " | |
64 | "would delay interrupt\n"); | |
3136254c BH |
65 | return; /* delay not allowed */ |
66 | } | |
3136254c | 67 | msleep(wait_time); |
3136254c | 68 | } |
507279db | 69 | } while (wait_time && (get_tb() < max_wait_tb)); |
3136254c | 70 | |
9a8f99fa CD |
71 | if (error != 0) { |
72 | printk_ratelimited(KERN_WARNING | |
73 | "error: reading the clock failed (%d)\n", | |
74 | error); | |
3136254c BH |
75 | return; |
76 | } | |
77 | ||
78 | rtc_tm->tm_sec = ret[5]; | |
79 | rtc_tm->tm_min = ret[4]; | |
80 | rtc_tm->tm_hour = ret[3]; | |
81 | rtc_tm->tm_mday = ret[2]; | |
82 | rtc_tm->tm_mon = ret[1] - 1; | |
83 | rtc_tm->tm_year = ret[0] - 1900; | |
84 | } | |
85 | ||
86 | int rtas_set_rtc_time(struct rtc_time *tm) | |
87 | { | |
88 | int error, wait_time; | |
49e16b7b | 89 | u64 max_wait_tb; |
3136254c BH |
90 | |
91 | max_wait_tb = get_tb() + tb_ticks_per_usec * 1000 * MAX_RTC_WAIT; | |
92 | do { | |
93 | error = rtas_call(rtas_token("set-time-of-day"), 7, 1, NULL, | |
94 | tm->tm_year + 1900, tm->tm_mon + 1, | |
95 | tm->tm_mday, tm->tm_hour, tm->tm_min, | |
96 | tm->tm_sec, 0); | |
507279db JR |
97 | |
98 | wait_time = rtas_busy_delay_time(error); | |
99 | if (wait_time) { | |
3136254c BH |
100 | if (in_interrupt()) |
101 | return 1; /* probably decrementer */ | |
3136254c | 102 | msleep(wait_time); |
3136254c | 103 | } |
507279db | 104 | } while (wait_time && (get_tb() < max_wait_tb)); |
3136254c | 105 | |
9a8f99fa CD |
106 | if (error != 0) |
107 | printk_ratelimited(KERN_WARNING | |
108 | "error: setting the clock failed (%d)\n", | |
109 | error); | |
3136254c BH |
110 | |
111 | return 0; | |
112 | } |