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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
3136254c BH |
2 | #include <linux/kernel.h> |
3 | #include <linux/time.h> | |
4 | #include <linux/timer.h> | |
5 | #include <linux/init.h> | |
6 | #include <linux/rtc.h> | |
7 | #include <linux/delay.h> | |
9a8f99fa | 8 | #include <linux/ratelimit.h> |
3136254c BH |
9 | #include <asm/prom.h> |
10 | #include <asm/rtas.h> | |
11 | #include <asm/time.h> | |
12 | ||
13 | ||
14 | #define MAX_RTC_WAIT 5000 /* 5 sec */ | |
15 | #define RTAS_CLOCK_BUSY (-2) | |
5bfd6435 | 16 | time64_t __init rtas_get_boot_time(void) |
3136254c BH |
17 | { |
18 | int ret[8]; | |
507279db JR |
19 | int error; |
20 | unsigned int wait_time; | |
49e16b7b | 21 | u64 max_wait_tb; |
3136254c BH |
22 | |
23 | max_wait_tb = get_tb() + tb_ticks_per_usec * 1000 * MAX_RTC_WAIT; | |
24 | do { | |
25 | error = rtas_call(rtas_token("get-time-of-day"), 0, 8, ret); | |
507279db JR |
26 | |
27 | wait_time = rtas_busy_delay_time(error); | |
28 | if (wait_time) { | |
3136254c BH |
29 | /* This is boot time so we spin. */ |
30 | udelay(wait_time*1000); | |
3136254c | 31 | } |
507279db | 32 | } while (wait_time && (get_tb() < max_wait_tb)); |
3136254c | 33 | |
9a8f99fa CD |
34 | if (error != 0) { |
35 | printk_ratelimited(KERN_WARNING | |
36 | "error: reading the clock failed (%d)\n", | |
37 | error); | |
3136254c BH |
38 | return 0; |
39 | } | |
40 | ||
5bfd6435 | 41 | return mktime64(ret[0], ret[1], ret[2], ret[3], ret[4], ret[5]); |
3136254c BH |
42 | } |
43 | ||
44 | /* NOTE: get_rtc_time will get an error if executed in interrupt context | |
45 | * and if a delay is needed to read the clock. In this case we just | |
46 | * silently return without updating rtc_tm. | |
47 | */ | |
48 | void rtas_get_rtc_time(struct rtc_time *rtc_tm) | |
49 | { | |
50 | int ret[8]; | |
507279db JR |
51 | int error; |
52 | unsigned int wait_time; | |
49e16b7b | 53 | u64 max_wait_tb; |
3136254c BH |
54 | |
55 | max_wait_tb = get_tb() + tb_ticks_per_usec * 1000 * MAX_RTC_WAIT; | |
56 | do { | |
57 | error = rtas_call(rtas_token("get-time-of-day"), 0, 8, ret); | |
507279db JR |
58 | |
59 | wait_time = rtas_busy_delay_time(error); | |
60 | if (wait_time) { | |
9a8f99fa | 61 | if (in_interrupt()) { |
0e8ed479 | 62 | memset(rtc_tm, 0, sizeof(struct rtc_time)); |
9a8f99fa CD |
63 | printk_ratelimited(KERN_WARNING |
64 | "error: reading clock " | |
65 | "would delay interrupt\n"); | |
3136254c BH |
66 | return; /* delay not allowed */ |
67 | } | |
3136254c | 68 | msleep(wait_time); |
3136254c | 69 | } |
507279db | 70 | } while (wait_time && (get_tb() < max_wait_tb)); |
3136254c | 71 | |
9a8f99fa CD |
72 | if (error != 0) { |
73 | printk_ratelimited(KERN_WARNING | |
74 | "error: reading the clock failed (%d)\n", | |
75 | error); | |
3136254c BH |
76 | return; |
77 | } | |
78 | ||
79 | rtc_tm->tm_sec = ret[5]; | |
80 | rtc_tm->tm_min = ret[4]; | |
81 | rtc_tm->tm_hour = ret[3]; | |
82 | rtc_tm->tm_mday = ret[2]; | |
83 | rtc_tm->tm_mon = ret[1] - 1; | |
84 | rtc_tm->tm_year = ret[0] - 1900; | |
85 | } | |
86 | ||
87 | int rtas_set_rtc_time(struct rtc_time *tm) | |
88 | { | |
89 | int error, wait_time; | |
49e16b7b | 90 | u64 max_wait_tb; |
3136254c BH |
91 | |
92 | max_wait_tb = get_tb() + tb_ticks_per_usec * 1000 * MAX_RTC_WAIT; | |
93 | do { | |
94 | error = rtas_call(rtas_token("set-time-of-day"), 7, 1, NULL, | |
95 | tm->tm_year + 1900, tm->tm_mon + 1, | |
96 | tm->tm_mday, tm->tm_hour, tm->tm_min, | |
97 | tm->tm_sec, 0); | |
507279db JR |
98 | |
99 | wait_time = rtas_busy_delay_time(error); | |
100 | if (wait_time) { | |
3136254c BH |
101 | if (in_interrupt()) |
102 | return 1; /* probably decrementer */ | |
3136254c | 103 | msleep(wait_time); |
3136254c | 104 | } |
507279db | 105 | } while (wait_time && (get_tb() < max_wait_tb)); |
3136254c | 106 | |
9a8f99fa CD |
107 | if (error != 0) |
108 | printk_ratelimited(KERN_WARNING | |
109 | "error: setting the clock failed (%d)\n", | |
110 | error); | |
3136254c BH |
111 | |
112 | return 0; | |
113 | } |