[linux-2.6-block.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 <linux/ratelimit.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_ratelimited(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()) {
				memset(rtc_tm, 0, sizeof(struct rtc_time));
				printk_ratelimited(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_ratelimited(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_ratelimited(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>
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;
507279db JR	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. */
3136254c BH	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;
507279db JR	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 */
3136254c BH	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())
3136254c BH	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	}