1 #include <linux/kernel.h>
2 #include <linux/time.h>
3 #include <linux/timer.h>
4 #include <linux/init.h>
6 #include <linux/delay.h>
12 #define MAX_RTC_WAIT 5000 /* 5 sec */
13 #define RTAS_CLOCK_BUSY (-2)
14 unsigned long __init
rtas_get_boot_time(void)
18 unsigned int wait_time
;
21 max_wait_tb
= get_tb() + tb_ticks_per_usec
* 1000 * MAX_RTC_WAIT
;
23 error
= rtas_call(rtas_token("get-time-of-day"), 0, 8, ret
);
25 wait_time
= rtas_busy_delay_time(error
);
27 /* This is boot time so we spin. */
28 udelay(wait_time
*1000);
30 } while (wait_time
&& (get_tb() < max_wait_tb
));
32 if (error
!= 0 && printk_ratelimit()) {
33 printk(KERN_WARNING
"error: reading the clock failed (%d)\n",
38 return mktime(ret
[0], ret
[1], ret
[2], ret
[3], ret
[4], ret
[5]);
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.
45 void rtas_get_rtc_time(struct rtc_time
*rtc_tm
)
49 unsigned int wait_time
;
52 max_wait_tb
= get_tb() + tb_ticks_per_usec
* 1000 * MAX_RTC_WAIT
;
54 error
= rtas_call(rtas_token("get-time-of-day"), 0, 8, ret
);
56 wait_time
= rtas_busy_delay_time(error
);
58 if (in_interrupt() && printk_ratelimit()) {
59 memset(rtc_tm
, 0, sizeof(struct rtc_time
));
60 printk(KERN_WARNING
"error: reading clock"
61 " would delay interrupt\n");
62 return; /* delay not allowed */
66 } while (wait_time
&& (get_tb() < max_wait_tb
));
68 if (error
!= 0 && printk_ratelimit()) {
69 printk(KERN_WARNING
"error: reading the clock failed (%d)\n",
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;
82 int rtas_set_rtc_time(struct rtc_time
*tm
)
87 max_wait_tb
= get_tb() + tb_ticks_per_usec
* 1000 * MAX_RTC_WAIT
;
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
,
94 wait_time
= rtas_busy_delay_time(error
);
97 return 1; /* probably decrementer */
100 } while (wait_time
&& (get_tb() < max_wait_tb
));
102 if (error
!= 0 && printk_ratelimit())
103 printk(KERN_WARNING
"error: setting the clock failed (%d)\n",
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