[deliverable/linux.git] / arch / powerpc / kernel / rtas-rtc.c

#include <linux/kernel.h>
#include <linux/time.h>
#include <linux/timer.h>
#include <linux/init.h>
#include <linux/rtc.h>
#include <linux/delay.h>
#include <asm/prom.h>
#include <asm/rtas.h>
#include <asm/time.h>


#define MAX_RTC_WAIT 5000	/* 5 sec */
#define RTAS_CLOCK_BUSY (-2)
unsigned long __init rtas_get_boot_time(void)
{
	int ret[8];
	int error;
	unsigned int wait_time;
	u64 max_wait_tb;

	max_wait_tb = get_tb() + tb_ticks_per_usec * 1000 * MAX_RTC_WAIT;
	do {
		error = rtas_call(rtas_token("get-time-of-day"), 0, 8, ret);

		wait_time = rtas_busy_delay_time(error);
		if (wait_time) {
			/* This is boot time so we spin. */
			udelay(wait_time*1000);
		}
	} while (wait_time && (get_tb() < max_wait_tb));

	if (error != 0 && printk_ratelimit()) {
		printk(KERN_WARNING "error: reading the clock failed (%d)\n",
			error);
		return 0;
	}

	return mktime(ret[0], ret[1], ret[2], ret[3], ret[4], ret[5]);
}

/* NOTE: get_rtc_time will get an error if executed in interrupt context
 * and if a delay is needed to read the clock.  In this case we just
 * silently return without updating rtc_tm.
 */
void rtas_get_rtc_time(struct rtc_time *rtc_tm)
{
        int ret[8];
	int error;
	unsigned int wait_time;
	u64 max_wait_tb;

	max_wait_tb = get_tb() + tb_ticks_per_usec * 1000 * MAX_RTC_WAIT;
	do {
		error = rtas_call(rtas_token("get-time-of-day"), 0, 8, ret);

		wait_time = rtas_busy_delay_time(error);
		if (wait_time) {
			if (in_interrupt() && printk_ratelimit()) {
				memset(rtc_tm, 0, sizeof(struct rtc_time));
				printk(KERN_WARNING "error: reading clock"
				       " would delay interrupt\n");
				return;	/* delay not allowed */
			}
			msleep(wait_time);
		}
	} while (wait_time && (get_tb() < max_wait_tb));

        if (error != 0 && printk_ratelimit()) {
                printk(KERN_WARNING "error: reading the clock failed (%d)\n",
		       error);
		return;
        }

	rtc_tm->tm_sec = ret[5];
	rtc_tm->tm_min = ret[4];
	rtc_tm->tm_hour = ret[3];
	rtc_tm->tm_mday = ret[2];
	rtc_tm->tm_mon = ret[1] - 1;
	rtc_tm->tm_year = ret[0] - 1900;
}

int rtas_set_rtc_time(struct rtc_time *tm)
{
	int error, wait_time;
	u64 max_wait_tb;

	max_wait_tb = get_tb() + tb_ticks_per_usec * 1000 * MAX_RTC_WAIT;
	do {
	        error = rtas_call(rtas_token("set-time-of-day"), 7, 1, NULL,
				  tm->tm_year + 1900, tm->tm_mon + 1,
				  tm->tm_mday, tm->tm_hour, tm->tm_min,
				  tm->tm_sec, 0);

		wait_time = rtas_busy_delay_time(error);
		if (wait_time) {
			if (in_interrupt())
				return 1;	/* probably decrementer */
			msleep(wait_time);
		}
	} while (wait_time && (get_tb() < max_wait_tb));

        if (error != 0 && printk_ratelimit())
                printk(KERN_WARNING "error: setting the clock failed (%d)\n",
		       error);

        return 0;
}
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;
507279db JR	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. */
3136254c BH	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;
507279db JR	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())
3136254c BH	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	}