Benjamin Herrenschmidt | 3136254 | 2005-11-14 15:49:48 +1100 | [diff] [blame] | 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]; |
John Rose | 507279d | 2006-06-05 16:31:48 -0500 | [diff] [blame] | 17 | int error; |
| 18 | unsigned int wait_time; |
Paul Mackerras | 49e16b7 | 2005-11-18 15:52:38 +1100 | [diff] [blame] | 19 | u64 max_wait_tb; |
Benjamin Herrenschmidt | 3136254 | 2005-11-14 15:49:48 +1100 | [diff] [blame] | 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); |
John Rose | 507279d | 2006-06-05 16:31:48 -0500 | [diff] [blame] | 24 | |
| 25 | wait_time = rtas_busy_delay_time(error); |
| 26 | if (wait_time) { |
Benjamin Herrenschmidt | 3136254 | 2005-11-14 15:49:48 +1100 | [diff] [blame] | 27 | /* This is boot time so we spin. */ |
| 28 | udelay(wait_time*1000); |
Benjamin Herrenschmidt | 3136254 | 2005-11-14 15:49:48 +1100 | [diff] [blame] | 29 | } |
John Rose | 507279d | 2006-06-05 16:31:48 -0500 | [diff] [blame] | 30 | } while (wait_time && (get_tb() < max_wait_tb)); |
Benjamin Herrenschmidt | 3136254 | 2005-11-14 15:49:48 +1100 | [diff] [blame] | 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]; |
John Rose | 507279d | 2006-06-05 16:31:48 -0500 | [diff] [blame] | 48 | int error; |
| 49 | unsigned int wait_time; |
Paul Mackerras | 49e16b7 | 2005-11-18 15:52:38 +1100 | [diff] [blame] | 50 | u64 max_wait_tb; |
Benjamin Herrenschmidt | 3136254 | 2005-11-14 15:49:48 +1100 | [diff] [blame] | 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); |
John Rose | 507279d | 2006-06-05 16:31:48 -0500 | [diff] [blame] | 55 | |
| 56 | wait_time = rtas_busy_delay_time(error); |
| 57 | if (wait_time) { |
Benjamin Herrenschmidt | 3136254 | 2005-11-14 15:49:48 +1100 | [diff] [blame] | 58 | if (in_interrupt() && printk_ratelimit()) { |
Michael Neuling | 0e8ed47 | 2006-03-14 17:11:51 +1100 | [diff] [blame] | 59 | memset(rtc_tm, 0, sizeof(struct rtc_time)); |
Benjamin Herrenschmidt | 3136254 | 2005-11-14 15:49:48 +1100 | [diff] [blame] | 60 | printk(KERN_WARNING "error: reading clock" |
| 61 | " would delay interrupt\n"); |
| 62 | return; /* delay not allowed */ |
| 63 | } |
Benjamin Herrenschmidt | 3136254 | 2005-11-14 15:49:48 +1100 | [diff] [blame] | 64 | msleep(wait_time); |
Benjamin Herrenschmidt | 3136254 | 2005-11-14 15:49:48 +1100 | [diff] [blame] | 65 | } |
John Rose | 507279d | 2006-06-05 16:31:48 -0500 | [diff] [blame] | 66 | } while (wait_time && (get_tb() < max_wait_tb)); |
Benjamin Herrenschmidt | 3136254 | 2005-11-14 15:49:48 +1100 | [diff] [blame] | 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; |
Paul Mackerras | 49e16b7 | 2005-11-18 15:52:38 +1100 | [diff] [blame] | 85 | u64 max_wait_tb; |
Benjamin Herrenschmidt | 3136254 | 2005-11-14 15:49:48 +1100 | [diff] [blame] | 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); |
John Rose | 507279d | 2006-06-05 16:31:48 -0500 | [diff] [blame] | 93 | |
| 94 | wait_time = rtas_busy_delay_time(error); |
| 95 | if (wait_time) { |
Benjamin Herrenschmidt | 3136254 | 2005-11-14 15:49:48 +1100 | [diff] [blame] | 96 | if (in_interrupt()) |
| 97 | return 1; /* probably decrementer */ |
Benjamin Herrenschmidt | 3136254 | 2005-11-14 15:49:48 +1100 | [diff] [blame] | 98 | msleep(wait_time); |
Benjamin Herrenschmidt | 3136254 | 2005-11-14 15:49:48 +1100 | [diff] [blame] | 99 | } |
John Rose | 507279d | 2006-06-05 16:31:48 -0500 | [diff] [blame] | 100 | } while (wait_time && (get_tb() < max_wait_tb)); |
Benjamin Herrenschmidt | 3136254 | 2005-11-14 15:49:48 +1100 | [diff] [blame] | 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 | } |