[deliverable/linux.git] / arch / sparc / kernel / time.c

/* $Id: time.c,v 1.60 2002/01/23 14:33:55 davem Exp $
 * linux/arch/sparc/kernel/time.c
 *
 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
 * Copyright (C) 1996 Thomas K. Dyas (tdyas@eden.rutgers.edu)
 *
 * Chris Davis (cdavis@cois.on.ca) 03/27/1998
 * Added support for the intersil on the sun4/4200
 *
 * Gleb Raiko (rajko@mech.math.msu.su) 08/18/1998
 * Support for MicroSPARC-IIep, PCI CPU.
 *
 * This file handles the Sparc specific time handling details.
 *
 * 1997-09-10	Updated NTP code according to technical memorandum Jan '96
 *		"A Kernel Model for Precision Timekeeping" by Dave Mills
 */
#include <linux/errno.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/param.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/time.h>
#include <linux/timex.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/ioport.h>
#include <linux/profile.h>

#include <asm/oplib.h>
#include <asm/timer.h>
#include <asm/mostek.h>
#include <asm/system.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <asm/idprom.h>
#include <asm/machines.h>
#include <asm/sun4paddr.h>
#include <asm/page.h>
#include <asm/pcic.h>
#include <asm/of_device.h>

DEFINE_SPINLOCK(rtc_lock);
enum sparc_clock_type sp_clock_typ;
DEFINE_SPINLOCK(mostek_lock);
void __iomem *mstk48t02_regs = NULL;
static struct mostek48t08 __iomem *mstk48t08_regs = NULL;
static int set_rtc_mmss(unsigned long);
static int sbus_do_settimeofday(struct timespec *tv);

#ifdef CONFIG_SUN4
struct intersil *intersil_clock;
#define intersil_cmd(intersil_reg, intsil_cmd) intersil_reg->int_cmd_reg = \
	(intsil_cmd)

#define intersil_intr(intersil_reg, intsil_cmd) intersil_reg->int_intr_reg = \
	(intsil_cmd)

#define intersil_start(intersil_reg) intersil_cmd(intersil_reg, \
	( INTERSIL_START | INTERSIL_32K | INTERSIL_NORMAL | INTERSIL_24H |\
	  INTERSIL_INTR_ENABLE))

#define intersil_stop(intersil_reg) intersil_cmd(intersil_reg, \
	( INTERSIL_STOP | INTERSIL_32K | INTERSIL_NORMAL | INTERSIL_24H |\
	  INTERSIL_INTR_ENABLE))

#define intersil_read_intr(intersil_reg, towhere) towhere = \
	intersil_reg->int_intr_reg

#endif

unsigned long profile_pc(struct pt_regs *regs)
{
	extern char __copy_user_begin[], __copy_user_end[];
	extern char __atomic_begin[], __atomic_end[];
	extern char __bzero_begin[], __bzero_end[];
	extern char __bitops_begin[], __bitops_end[];

	unsigned long pc = regs->pc;

	if (in_lock_functions(pc) ||
	    (pc >= (unsigned long) __copy_user_begin &&
	     pc < (unsigned long) __copy_user_end) ||
	    (pc >= (unsigned long) __atomic_begin &&
	     pc < (unsigned long) __atomic_end) ||
	    (pc >= (unsigned long) __bzero_begin &&
	     pc < (unsigned long) __bzero_end) ||
	    (pc >= (unsigned long) __bitops_begin &&
	     pc < (unsigned long) __bitops_end))
		pc = regs->u_regs[UREG_RETPC];
	return pc;
}

__volatile__ unsigned int *master_l10_counter;
__volatile__ unsigned int *master_l10_limit;

/*
 * timer_interrupt() needs to keep up the real-time clock,
 * as well as call the "do_timer()" routine every clocktick
 */

#define TICK_SIZE (tick_nsec / 1000)

irqreturn_t timer_interrupt(int irq, void *dev_id, struct pt_regs * regs)
{
	/* last time the cmos clock got updated */
	static long last_rtc_update;

#ifndef CONFIG_SMP
	profile_tick(CPU_PROFILING, regs);
#endif

	/* Protect counter clear so that do_gettimeoffset works */
	write_seqlock(&xtime_lock);
#ifdef CONFIG_SUN4
	if((idprom->id_machtype == (SM_SUN4 | SM_4_260)) ||
	   (idprom->id_machtype == (SM_SUN4 | SM_4_110))) {
		int temp;
        	intersil_read_intr(intersil_clock, temp);
		/* re-enable the irq */
		enable_pil_irq(10);
	}
#endif
	clear_clock_irq();

	do_timer(1);
#ifndef CONFIG_SMP
	update_process_times(user_mode(regs));
#endif


	/* Determine when to update the Mostek clock. */
	if (ntp_synced() &&
	    xtime.tv_sec > last_rtc_update + 660 &&
	    (xtime.tv_nsec / 1000) >= 500000 - ((unsigned) TICK_SIZE) / 2 &&
	    (xtime.tv_nsec / 1000) <= 500000 + ((unsigned) TICK_SIZE) / 2) {
	  if (set_rtc_mmss(xtime.tv_sec) == 0)
	    last_rtc_update = xtime.tv_sec;
	  else
	    last_rtc_update = xtime.tv_sec - 600; /* do it again in 60 s */
	}
	write_sequnlock(&xtime_lock);

	return IRQ_HANDLED;
}

/* Kick start a stopped clock (procedure from the Sun NVRAM/hostid FAQ). */
static void __init kick_start_clock(void)
{
	struct mostek48t02 *regs = (struct mostek48t02 *)mstk48t02_regs;
	unsigned char sec;
	int i, count;

	prom_printf("CLOCK: Clock was stopped. Kick start ");

	spin_lock_irq(&mostek_lock);

	/* Turn on the kick start bit to start the oscillator. */
	regs->creg |= MSTK_CREG_WRITE;
	regs->sec &= ~MSTK_STOP;
	regs->hour |= MSTK_KICK_START;
	regs->creg &= ~MSTK_CREG_WRITE;

	spin_unlock_irq(&mostek_lock);

	/* Delay to allow the clock oscillator to start. */
	sec = MSTK_REG_SEC(regs);
	for (i = 0; i < 3; i++) {
		while (sec == MSTK_REG_SEC(regs))
			for (count = 0; count < 100000; count++)
				/* nothing */ ;
		prom_printf(".");
		sec = regs->sec;
	}
	prom_printf("\n");

	spin_lock_irq(&mostek_lock);

	/* Turn off kick start and set a "valid" time and date. */
	regs->creg |= MSTK_CREG_WRITE;
	regs->hour &= ~MSTK_KICK_START;
	MSTK_SET_REG_SEC(regs,0);
	MSTK_SET_REG_MIN(regs,0);
	MSTK_SET_REG_HOUR(regs,0);
	MSTK_SET_REG_DOW(regs,5);
	MSTK_SET_REG_DOM(regs,1);
	MSTK_SET_REG_MONTH(regs,8);
	MSTK_SET_REG_YEAR(regs,1996 - MSTK_YEAR_ZERO);
	regs->creg &= ~MSTK_CREG_WRITE;

	spin_unlock_irq(&mostek_lock);

	/* Ensure the kick start bit is off. If it isn't, turn it off. */
	while (regs->hour & MSTK_KICK_START) {
		prom_printf("CLOCK: Kick start still on!\n");

		spin_lock_irq(&mostek_lock);
		regs->creg |= MSTK_CREG_WRITE;
		regs->hour &= ~MSTK_KICK_START;
		regs->creg &= ~MSTK_CREG_WRITE;
		spin_unlock_irq(&mostek_lock);
	}

	prom_printf("CLOCK: Kick start procedure successful.\n");
}

/* Return nonzero if the clock chip battery is low. */
static __inline__ int has_low_battery(void)
{
	struct mostek48t02 *regs = (struct mostek48t02 *)mstk48t02_regs;
	unsigned char data1, data2;

	spin_lock_irq(&mostek_lock);
	data1 = regs->eeprom[0];	/* Read some data. */
	regs->eeprom[0] = ~data1;	/* Write back the complement. */
	data2 = regs->eeprom[0];	/* Read back the complement. */
	regs->eeprom[0] = data1;	/* Restore the original value. */
	spin_unlock_irq(&mostek_lock);

	return (data1 == data2);	/* Was the write blocked? */
}

static void __init mostek_set_system_time(void)
{
	unsigned int year, mon, day, hour, min, sec;
	struct mostek48t02 *mregs;

	mregs = (struct mostek48t02 *)mstk48t02_regs;
	if(!mregs) {
		prom_printf("Something wrong, clock regs not mapped yet.\n");
		prom_halt();
	}		
	spin_lock_irq(&mostek_lock);
	mregs->creg |= MSTK_CREG_READ;
	sec = MSTK_REG_SEC(mregs);
	min = MSTK_REG_MIN(mregs);
	hour = MSTK_REG_HOUR(mregs);
	day = MSTK_REG_DOM(mregs);
	mon = MSTK_REG_MONTH(mregs);
	year = MSTK_CVT_YEAR( MSTK_REG_YEAR(mregs) );
	xtime.tv_sec = mktime(year, mon, day, hour, min, sec);
	xtime.tv_nsec = (INITIAL_JIFFIES % HZ) * (NSEC_PER_SEC / HZ);
        set_normalized_timespec(&wall_to_monotonic,
                                -xtime.tv_sec, -xtime.tv_nsec);
	mregs->creg &= ~MSTK_CREG_READ;
	spin_unlock_irq(&mostek_lock);
}

/* Probe for the real time clock chip on Sun4 */
static __inline__ void sun4_clock_probe(void)
{
#ifdef CONFIG_SUN4
	int temp;
	struct resource r;

	memset(&r, 0, sizeof(r));
	if( idprom->id_machtype == (SM_SUN4 | SM_4_330) ) {
		sp_clock_typ = MSTK48T02;
		r.start = sun4_clock_physaddr;
		mstk48t02_regs = sbus_ioremap(&r, 0,
				       sizeof(struct mostek48t02), NULL);
		mstk48t08_regs = NULL;  /* To catch weirdness */
		intersil_clock = NULL;  /* just in case */

		/* Kick start the clock if it is completely stopped. */
		if (mostek_read(mstk48t02_regs + MOSTEK_SEC) & MSTK_STOP)
			kick_start_clock();
	} else if( idprom->id_machtype == (SM_SUN4 | SM_4_260)) {
		/* intersil setup code */
		printk("Clock: INTERSIL at %8x ",sun4_clock_physaddr);
		sp_clock_typ = INTERSIL;
		r.start = sun4_clock_physaddr;
		intersil_clock = (struct intersil *) 
		    sbus_ioremap(&r, 0, sizeof(*intersil_clock), "intersil");
		mstk48t02_regs = 0;  /* just be sure */
		mstk48t08_regs = NULL;  /* ditto */
		/* initialise the clock */

		intersil_intr(intersil_clock,INTERSIL_INT_100HZ);

		intersil_start(intersil_clock);

		intersil_read_intr(intersil_clock, temp);
                while (!(temp & 0x80))
                        intersil_read_intr(intersil_clock, temp);

                intersil_read_intr(intersil_clock, temp);
                while (!(temp & 0x80))
                        intersil_read_intr(intersil_clock, temp);

		intersil_stop(intersil_clock);

	}
#endif
}

#ifndef CONFIG_SUN4
static int __devinit clock_probe(struct of_device *op, const struct of_device_id *match)
{
	struct device_node *dp = op->node;
	char *model = of_get_property(dp, "model", NULL);

	if (!model)
		return -ENODEV;

	if (!strcmp(model, "mk48t02")) {
		sp_clock_typ = MSTK48T02;

		/* Map the clock register io area read-only */
		mstk48t02_regs = of_ioremap(&op->resource[0], 0,
					    sizeof(struct mostek48t02),
					    "mk48t02");
		mstk48t08_regs = NULL;  /* To catch weirdness */
	} else if (!strcmp(model, "mk48t08")) {
		sp_clock_typ = MSTK48T08;
		mstk48t08_regs = of_ioremap(&op->resource[0], 0,
					    sizeof(struct mostek48t08),
					    "mk48t08");

		mstk48t02_regs = &mstk48t08_regs->regs;
	} else
		return -ENODEV;

	/* Report a low battery voltage condition. */
	if (has_low_battery())
		printk(KERN_CRIT "NVRAM: Low battery voltage!\n");

	/* Kick start the clock if it is completely stopped. */
	if (mostek_read(mstk48t02_regs + MOSTEK_SEC) & MSTK_STOP)
		kick_start_clock();

	mostek_set_system_time();

	return 0;
}

static struct of_device_id clock_match[] = {
	{
		.name = "eeprom",
	},
	{},
};

static struct of_platform_driver clock_driver = {
	.name		= "clock",
	.match_table	= clock_match,
	.probe		= clock_probe,
};


/* Probe for the mostek real time clock chip. */
static int __init clock_init(void)
{
	return of_register_driver(&clock_driver, &of_bus_type);
}

/* Must be after subsys_initcall() so that busses are probed.  Must
 * be before device_initcall() because things like the RTC driver
 * need to see the clock registers.
 */
fs_initcall(clock_init);
#endif /* !CONFIG_SUN4 */

void __init sbus_time_init(void)
{

	BTFIXUPSET_CALL(bus_do_settimeofday, sbus_do_settimeofday, BTFIXUPCALL_NORM);
	btfixup();

	if (ARCH_SUN4)
		sun4_clock_probe();

	sparc_init_timers(timer_interrupt);
	
#ifdef CONFIG_SUN4
	if(idprom->id_machtype == (SM_SUN4 | SM_4_330)) {
		mostek_set_system_time();
	} else if(idprom->id_machtype == (SM_SUN4 | SM_4_260) ) {
		/* initialise the intersil on sun4 */
		unsigned int year, mon, day, hour, min, sec;
		int temp;
		struct intersil *iregs;

		iregs=intersil_clock;
		if(!iregs) {
			prom_printf("Something wrong, clock regs not mapped yet.\n");
			prom_halt();
		}

		intersil_intr(intersil_clock,INTERSIL_INT_100HZ);
		disable_pil_irq(10);
		intersil_stop(iregs);
		intersil_read_intr(intersil_clock, temp);

		temp = iregs->clk.int_csec;

		sec = iregs->clk.int_sec;
		min = iregs->clk.int_min;
		hour = iregs->clk.int_hour;
		day = iregs->clk.int_day;
		mon = iregs->clk.int_month;
		year = MSTK_CVT_YEAR(iregs->clk.int_year);

		enable_pil_irq(10);
		intersil_start(iregs);

		xtime.tv_sec = mktime(year, mon, day, hour, min, sec);
		xtime.tv_nsec = (INITIAL_JIFFIES % HZ) * (NSEC_PER_SEC / HZ);
	        set_normalized_timespec(&wall_to_monotonic,
 	                               -xtime.tv_sec, -xtime.tv_nsec);
		printk("%u/%u/%u %u:%u:%u\n",day,mon,year,hour,min,sec);
	}
#endif

	/* Now that OBP ticker has been silenced, it is safe to enable IRQ. */
	local_irq_enable();
}

void __init time_init(void)
{
#ifdef CONFIG_PCI
	extern void pci_time_init(void);
	if (pcic_present()) {
		pci_time_init();
		return;
	}
#endif
	sbus_time_init();
}

static inline unsigned long do_gettimeoffset(void)
{
	return (*master_l10_counter >> 10) & 0x1fffff;
}

/*
 * Returns nanoseconds
 * XXX This is a suboptimal implementation.
 */
unsigned long long sched_clock(void)
{
	return (unsigned long long)jiffies * (1000000000 / HZ);
}

/* Ok, my cute asm atomicity trick doesn't work anymore.
 * There are just too many variables that need to be protected
 * now (both members of xtime, et al.)
 */
void do_gettimeofday(struct timeval *tv)
{
	unsigned long flags;
	unsigned long seq;
	unsigned long usec, sec;
	unsigned long max_ntp_tick = tick_usec - tickadj;

	do {
		seq = read_seqbegin_irqsave(&xtime_lock, flags);
		usec = do_gettimeoffset();

		/*
		 * If time_adjust is negative then NTP is slowing the clock
		 * so make sure not to go into next possible interval.
		 * Better to lose some accuracy than have time go backwards..
		 */
		if (unlikely(time_adjust < 0))
			usec = min(usec, max_ntp_tick);

		sec = xtime.tv_sec;
		usec += (xtime.tv_nsec / 1000);
	} while (read_seqretry_irqrestore(&xtime_lock, seq, flags));

	while (usec >= 1000000) {
		usec -= 1000000;
		sec++;
	}

	tv->tv_sec = sec;
	tv->tv_usec = usec;
}

EXPORT_SYMBOL(do_gettimeofday);

int do_settimeofday(struct timespec *tv)
{
	int ret;

	write_seqlock_irq(&xtime_lock);
	ret = bus_do_settimeofday(tv);
	write_sequnlock_irq(&xtime_lock);
	clock_was_set();
	return ret;
}

EXPORT_SYMBOL(do_settimeofday);

static int sbus_do_settimeofday(struct timespec *tv)
{
	time_t wtm_sec, sec = tv->tv_sec;
	long wtm_nsec, nsec = tv->tv_nsec;

	if ((unsigned long)tv->tv_nsec >= NSEC_PER_SEC)
		return -EINVAL;

	/*
	 * This is revolting. We need to set "xtime" correctly. However, the
	 * value in this location is the value at the most recent update of
	 * wall time.  Discover what correction gettimeofday() would have
	 * made, and then undo it!
	 */
	nsec -= 1000 * do_gettimeoffset();

	wtm_sec  = wall_to_monotonic.tv_sec + (xtime.tv_sec - sec);
	wtm_nsec = wall_to_monotonic.tv_nsec + (xtime.tv_nsec - nsec);

	set_normalized_timespec(&xtime, sec, nsec);
	set_normalized_timespec(&wall_to_monotonic, wtm_sec, wtm_nsec);

	ntp_clear();
	return 0;
}

/*
 * BUG: This routine does not handle hour overflow properly; it just
 *      sets the minutes. Usually you won't notice until after reboot!
 */
static int set_rtc_mmss(unsigned long nowtime)
{
	int real_seconds, real_minutes, mostek_minutes;
	struct mostek48t02 *regs = (struct mostek48t02 *)mstk48t02_regs;
	unsigned long flags;
#ifdef CONFIG_SUN4
	struct intersil *iregs = intersil_clock;
	int temp;
#endif

	/* Not having a register set can lead to trouble. */
	if (!regs) {
#ifdef CONFIG_SUN4
		if(!iregs)
		return -1;
	 	else {
			temp = iregs->clk.int_csec;

			mostek_minutes = iregs->clk.int_min;

			real_seconds = nowtime % 60;
			real_minutes = nowtime / 60;
			if (((abs(real_minutes - mostek_minutes) + 15)/30) & 1)
				real_minutes += 30;	/* correct for half hour time zone */
			real_minutes %= 60;

			if (abs(real_minutes - mostek_minutes) < 30) {
				intersil_stop(iregs);
				iregs->clk.int_sec=real_seconds;
				iregs->clk.int_min=real_minutes;
				intersil_start(iregs);
			} else {
				printk(KERN_WARNING
			       "set_rtc_mmss: can't update from %d to %d\n",
				       mostek_minutes, real_minutes);
				return -1;
			}
			
			return 0;
		}
#endif
	}

	spin_lock_irqsave(&mostek_lock, flags);
	/* Read the current RTC minutes. */
	regs->creg |= MSTK_CREG_READ;
	mostek_minutes = MSTK_REG_MIN(regs);
	regs->creg &= ~MSTK_CREG_READ;

	/*
	 * since we're only adjusting minutes and seconds,
	 * don't interfere with hour overflow. This avoids
	 * messing with unknown time zones but requires your
	 * RTC not to be off by more than 15 minutes
	 */
	real_seconds = nowtime % 60;
	real_minutes = nowtime / 60;
	if (((abs(real_minutes - mostek_minutes) + 15)/30) & 1)
		real_minutes += 30;	/* correct for half hour time zone */
	real_minutes %= 60;

	if (abs(real_minutes - mostek_minutes) < 30) {
		regs->creg |= MSTK_CREG_WRITE;
		MSTK_SET_REG_SEC(regs,real_seconds);
		MSTK_SET_REG_MIN(regs,real_minutes);
		regs->creg &= ~MSTK_CREG_WRITE;
		spin_unlock_irqrestore(&mostek_lock, flags);
		return 0;
	} else {
		spin_unlock_irqrestore(&mostek_lock, flags);
		return -1;
	}
}
Commit	Line	Data
1da177e4 LT	1	/* $Id: time.c,v 1.60 2002/01/23 14:33:55 davem Exp $
	2	* linux/arch/sparc/kernel/time.c
	3	*
	4	* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
	5	* Copyright (C) 1996 Thomas K. Dyas (tdyas@eden.rutgers.edu)
	6	*
	7	* Chris Davis (cdavis@cois.on.ca) 03/27/1998
	8	* Added support for the intersil on the sun4/4200
	9	*
	10	* Gleb Raiko (rajko@mech.math.msu.su) 08/18/1998
	11	* Support for MicroSPARC-IIep, PCI CPU.
	12	*
	13	* This file handles the Sparc specific time handling details.
	14	*
	15	* 1997-09-10 Updated NTP code according to technical memorandum Jan '96
	16	* "A Kernel Model for Precision Timekeeping" by Dave Mills
	17	*/
1da177e4 LT	18	#include <linux/errno.h>
	19	#include <linux/module.h>
	20	#include <linux/sched.h>
	21	#include <linux/kernel.h>
	22	#include <linux/param.h>
	23	#include <linux/string.h>
	24	#include <linux/mm.h>
	25	#include <linux/interrupt.h>
	26	#include <linux/time.h>
	27	#include <linux/timex.h>
	28	#include <linux/init.h>
	29	#include <linux/pci.h>
	30	#include <linux/ioport.h>
	31	#include <linux/profile.h>
	32
	33	#include <asm/oplib.h>
1da177e4 LT	34	#include <asm/timer.h>
	35	#include <asm/mostek.h>
	36	#include <asm/system.h>
	37	#include <asm/irq.h>
	38	#include <asm/io.h>
	39	#include <asm/idprom.h>
	40	#include <asm/machines.h>
	41	#include <asm/sun4paddr.h>
	42	#include <asm/page.h>
	43	#include <asm/pcic.h>
ee5caf0e	44	#include <asm/of_device.h>
1da177e4	45
1da177e4 LT	46	DEFINE_SPINLOCK(rtc_lock);
	47	enum sparc_clock_type sp_clock_typ;
	48	DEFINE_SPINLOCK(mostek_lock);
	49	void __iomem *mstk48t02_regs = NULL;
c316ef04	50	static struct mostek48t08 __iomem *mstk48t08_regs = NULL;
1da177e4 LT	51	static int set_rtc_mmss(unsigned long);
	52	static int sbus_do_settimeofday(struct timespec *tv);
	53
	54	#ifdef CONFIG_SUN4
	55	struct intersil *intersil_clock;
	56	#define intersil_cmd(intersil_reg, intsil_cmd) intersil_reg->int_cmd_reg = \
	57	(intsil_cmd)
	58
	59	#define intersil_intr(intersil_reg, intsil_cmd) intersil_reg->int_intr_reg = \
	60	(intsil_cmd)
	61
	62	#define intersil_start(intersil_reg) intersil_cmd(intersil_reg, \
	63	( INTERSIL_START \| INTERSIL_32K \| INTERSIL_NORMAL \| INTERSIL_24H \|\
	64	INTERSIL_INTR_ENABLE))
	65
	66	#define intersil_stop(intersil_reg) intersil_cmd(intersil_reg, \
	67	( INTERSIL_STOP \| INTERSIL_32K \| INTERSIL_NORMAL \| INTERSIL_24H \|\
	68	INTERSIL_INTR_ENABLE))
	69
	70	#define intersil_read_intr(intersil_reg, towhere) towhere = \
	71	intersil_reg->int_intr_reg
	72
	73	#endif
	74
	75	unsigned long profile_pc(struct pt_regs *regs)
	76	{
	77	extern char __copy_user_begin[], __copy_user_end[];
	78	extern char __atomic_begin[], __atomic_end[];
	79	extern char __bzero_begin[], __bzero_end[];
	80	extern char __bitops_begin[], __bitops_end[];
	81
	82	unsigned long pc = regs->pc;
	83
	84	if (in_lock_functions(pc) \|\|
	85	(pc >= (unsigned long) __copy_user_begin &&
	86	pc < (unsigned long) __copy_user_end) \|\|
	87	(pc >= (unsigned long) __atomic_begin &&
	88	pc < (unsigned long) __atomic_end) \|\|
	89	(pc >= (unsigned long) __bzero_begin &&
	90	pc < (unsigned long) __bzero_end) \|\|
	91	(pc >= (unsigned long) __bitops_begin &&
	92	pc < (unsigned long) __bitops_end))
	93	pc = regs->u_regs[UREG_RETPC];
	94	return pc;
	95	}
	96
	97	__volatile__ unsigned int *master_l10_counter;
	98	__volatile__ unsigned int *master_l10_limit;
	99
	100	/*
	101	* timer_interrupt() needs to keep up the real-time clock,
	102	* as well as call the "do_timer()" routine every clocktick
	103	*/
	104
	105	#define TICK_SIZE (tick_nsec / 1000)
	106
	107	irqreturn_t timer_interrupt(int irq, void dev_id, struct pt_regs regs)
	108	{
	109	/* last time the cmos clock got updated */
	110	static long last_rtc_update;
	111
	112	#ifndef CONFIG_SMP
	113	profile_tick(CPU_PROFILING, regs);
	114	#endif
115
116	/* Protect counter clear so that do_gettimeoffset works */
117	write_seqlock(&xtime_lock);
118	#ifdef CONFIG_SUN4
119	if((idprom->id_machtype == (SM_SUN4 \| SM_4_260)) \|\|
120	(idprom->id_machtype == (SM_SUN4 \| SM_4_110))) {
121	int temp;
122	intersil_read_intr(intersil_clock, temp);
123	/* re-enable the irq */
124	enable_pil_irq(10);
125	}
126	#endif
127	clear_clock_irq();
128
3171a030	129	do_timer(1);
1da177e4 LT	130	#ifndef CONFIG_SMP
	131	update_process_times(user_mode(regs));
	132	#endif
	133
	134
	135	/* Determine when to update the Mostek clock. */
b149ee22	136	if (ntp_synced() &&
1da177e4 LT	137	xtime.tv_sec > last_rtc_update + 660 &&
	138	(xtime.tv_nsec / 1000) >= 500000 - ((unsigned) TICK_SIZE) / 2 &&
	139	(xtime.tv_nsec / 1000) <= 500000 + ((unsigned) TICK_SIZE) / 2) {
	140	if (set_rtc_mmss(xtime.tv_sec) == 0)
	141	last_rtc_update = xtime.tv_sec;
	142	else
	143	last_rtc_update = xtime.tv_sec - 600; /* do it again in 60 s */
	144	}
	145	write_sequnlock(&xtime_lock);
	146
	147	return IRQ_HANDLED;
	148	}
	149
	150	/* Kick start a stopped clock (procedure from the Sun NVRAM/hostid FAQ). */
	151	static void __init kick_start_clock(void)
	152	{
	153	struct mostek48t02 regs = (struct mostek48t02 )mstk48t02_regs;
	154	unsigned char sec;
	155	int i, count;
	156
	157	prom_printf("CLOCK: Clock was stopped. Kick start ");
	158
	159	spin_lock_irq(&mostek_lock);
	160
	161	/* Turn on the kick start bit to start the oscillator. */
	162	regs->creg \|= MSTK_CREG_WRITE;
	163	regs->sec &= ~MSTK_STOP;
	164	regs->hour \|= MSTK_KICK_START;
	165	regs->creg &= ~MSTK_CREG_WRITE;
	166
	167	spin_unlock_irq(&mostek_lock);
	168
	169	/* Delay to allow the clock oscillator to start. */
	170	sec = MSTK_REG_SEC(regs);
	171	for (i = 0; i < 3; i++) {
	172	while (sec == MSTK_REG_SEC(regs))
	173	for (count = 0; count < 100000; count++)
	174	/* nothing */ ;
	175	prom_printf(".");
	176	sec = regs->sec;
	177	}
	178	prom_printf("\n");
	179
	180	spin_lock_irq(&mostek_lock);
	181
	182	/* Turn off kick start and set a "valid" time and date. */
	183	regs->creg \|= MSTK_CREG_WRITE;
	184	regs->hour &= ~MSTK_KICK_START;
	185	MSTK_SET_REG_SEC(regs,0);
	186	MSTK_SET_REG_MIN(regs,0);
	187	MSTK_SET_REG_HOUR(regs,0);
	188	MSTK_SET_REG_DOW(regs,5);
	189	MSTK_SET_REG_DOM(regs,1);
	190	MSTK_SET_REG_MONTH(regs,8);
	191	MSTK_SET_REG_YEAR(regs,1996 - MSTK_YEAR_ZERO);
	192	regs->creg &= ~MSTK_CREG_WRITE;
	193
	194	spin_unlock_irq(&mostek_lock);
	195
	196	/* Ensure the kick start bit is off. If it isn't, turn it off. */
	197	while (regs->hour & MSTK_KICK_START) {
	198	prom_printf("CLOCK: Kick start still on!\n");
	199
	200	spin_lock_irq(&mostek_lock);
201	regs->creg \|= MSTK_CREG_WRITE;
202	regs->hour &= ~MSTK_KICK_START;
203	regs->creg &= ~MSTK_CREG_WRITE;
204	spin_unlock_irq(&mostek_lock);
205	}
206
207	prom_printf("CLOCK: Kick start procedure successful.\n");
208	}
209
210	/* Return nonzero if the clock chip battery is low. */
211	static __inline__ int has_low_battery(void)
212	{
213	struct mostek48t02 regs = (struct mostek48t02 )mstk48t02_regs;
214	unsigned char data1, data2;
215
216	spin_lock_irq(&mostek_lock);
217	data1 = regs->eeprom[0]; /* Read some data. */
218	regs->eeprom[0] = ~data1; /* Write back the complement. */
219	data2 = regs->eeprom[0]; /* Read back the complement. */
220	regs->eeprom[0] = data1; /* Restore the original value. */
221	spin_unlock_irq(&mostek_lock);
222
223	return (data1 == data2); /* Was the write blocked? */
224	}
225
96ba989d BB	226	static void __init mostek_set_system_time(void)
	227	{
	228	unsigned int year, mon, day, hour, min, sec;
	229	struct mostek48t02 *mregs;
	230
	231	mregs = (struct mostek48t02 *)mstk48t02_regs;
	232	if(!mregs) {
	233	prom_printf("Something wrong, clock regs not mapped yet.\n");
	234	prom_halt();
	235	}
	236	spin_lock_irq(&mostek_lock);
	237	mregs->creg \|= MSTK_CREG_READ;
	238	sec = MSTK_REG_SEC(mregs);
	239	min = MSTK_REG_MIN(mregs);
	240	hour = MSTK_REG_HOUR(mregs);
	241	day = MSTK_REG_DOM(mregs);
	242	mon = MSTK_REG_MONTH(mregs);
	243	year = MSTK_CVT_YEAR( MSTK_REG_YEAR(mregs) );
	244	xtime.tv_sec = mktime(year, mon, day, hour, min, sec);
	245	xtime.tv_nsec = (INITIAL_JIFFIES % HZ) * (NSEC_PER_SEC / HZ);
	246	set_normalized_timespec(&wall_to_monotonic,
	247	-xtime.tv_sec, -xtime.tv_nsec);
	248	mregs->creg &= ~MSTK_CREG_READ;
	249	spin_unlock_irq(&mostek_lock);
	250	}
	251
1da177e4 LT	252	/* Probe for the real time clock chip on Sun4 */
	253	static __inline__ void sun4_clock_probe(void)
	254	{
	255	#ifdef CONFIG_SUN4
	256	int temp;
	257	struct resource r;
	258
	259	memset(&r, 0, sizeof(r));
	260	if( idprom->id_machtype == (SM_SUN4 \| SM_4_330) ) {
	261	sp_clock_typ = MSTK48T02;
	262	r.start = sun4_clock_physaddr;
	263	mstk48t02_regs = sbus_ioremap(&r, 0,
	264	sizeof(struct mostek48t02), NULL);
	265	mstk48t08_regs = NULL; /* To catch weirdness */
	266	intersil_clock = NULL; /* just in case */
	267
	268	/* Kick start the clock if it is completely stopped. */
	269	if (mostek_read(mstk48t02_regs + MOSTEK_SEC) & MSTK_STOP)
	270	kick_start_clock();
	271	} else if( idprom->id_machtype == (SM_SUN4 \| SM_4_260)) {
	272	/* intersil setup code */
	273	printk("Clock: INTERSIL at %8x ",sun4_clock_physaddr);
	274	sp_clock_typ = INTERSIL;
	275	r.start = sun4_clock_physaddr;
	276	intersil_clock = (struct intersil *)
	277	sbus_ioremap(&r, 0, sizeof(*intersil_clock), "intersil");
	278	mstk48t02_regs = 0; /* just be sure */
	279	mstk48t08_regs = NULL; /* ditto */
	280	/* initialise the clock */
	281
	282	intersil_intr(intersil_clock,INTERSIL_INT_100HZ);
	283
	284	intersil_start(intersil_clock);
	285
	286	intersil_read_intr(intersil_clock, temp);
	287	while (!(temp & 0x80))
	288	intersil_read_intr(intersil_clock, temp);
	289
	290	intersil_read_intr(intersil_clock, temp);
	291	while (!(temp & 0x80))
	292	intersil_read_intr(intersil_clock, temp);
	293
	294	intersil_stop(intersil_clock);
	295
	296	}
	297	#endif
	298	}
	299
96ba989d	300	#ifndef CONFIG_SUN4
ee5caf0e	301	static int __devinit clock_probe(struct of_device op, const struct of_device_id match)
1da177e4	302	{
ee5caf0e DM	303	struct device_node *dp = op->node;
ee5caf0e DM	304	char *model = of_get_property(dp, "model", NULL);
1da177e4	305
ee5caf0e DM	306	if (!model)
ee5caf0e DM	307	return -ENODEV;
1da177e4	308
ee5caf0e	309	if (!strcmp(model, "mk48t02")) {
1da177e4	310	sp_clock_typ = MSTK48T02;
ee5caf0e	311
1da177e4	312	/* Map the clock register io area read-only */
ee5caf0e DM	313	mstk48t02_regs = of_ioremap(&op->resource[0], 0,
	314	sizeof(struct mostek48t02),
	315	"mk48t02");
1da177e4	316	mstk48t08_regs = NULL; /* To catch weirdness */
ee5caf0e	317	} else if (!strcmp(model, "mk48t08")) {
1da177e4	318	sp_clock_typ = MSTK48T08;
ee5caf0e DM	319	mstk48t08_regs = of_ioremap(&op->resource[0], 0,
	320	sizeof(struct mostek48t08),
	321	"mk48t08");
1da177e4 LT	322
1da177e4 LT	323	mstk48t02_regs = &mstk48t08_regs->regs;
ee5caf0e DM	324	} else
ee5caf0e DM	325	return -ENODEV;
1da177e4 LT	326
	327	/* Report a low battery voltage condition. */
	328	if (has_low_battery())
	329	printk(KERN_CRIT "NVRAM: Low battery voltage!\n");
	330
	331	/* Kick start the clock if it is completely stopped. */
	332	if (mostek_read(mstk48t02_regs + MOSTEK_SEC) & MSTK_STOP)
	333	kick_start_clock();
ee5caf0e	334
96ba989d BB	335	mostek_set_system_time();
96ba989d BB	336
ee5caf0e DM	337	return 0;
	338	}
	339
	340	static struct of_device_id clock_match[] = {
	341	{
	342	.name = "eeprom",
	343	},
	344	{},
	345	};
	346
	347	static struct of_platform_driver clock_driver = {
	348	.name = "clock",
	349	.match_table = clock_match,
	350	.probe = clock_probe,
	351	};
	352
	353
	354	/* Probe for the mostek real time clock chip. */
96ba989d	355	static int __init clock_init(void)
ee5caf0e	356	{
96ba989d	357	return of_register_driver(&clock_driver, &of_bus_type);
1da177e4 LT	358	}
1da177e4 LT	359
96ba989d BB	360	/* Must be after subsys_initcall() so that busses are probed. Must
	361	* be before device_initcall() because things like the RTC driver
	362	* need to see the clock registers.
	363	*/
	364	fs_initcall(clock_init);
	365	#endif /* !CONFIG_SUN4 */
	366
1da177e4 LT	367	void __init sbus_time_init(void)
1da177e4 LT	368	{
1da177e4 LT	369
	370	BTFIXUPSET_CALL(bus_do_settimeofday, sbus_do_settimeofday, BTFIXUPCALL_NORM);
	371	btfixup();
	372
	373	if (ARCH_SUN4)
	374	sun4_clock_probe();
1da177e4 LT	375
	376	sparc_init_timers(timer_interrupt);
	377
	378	#ifdef CONFIG_SUN4
	379	if(idprom->id_machtype == (SM_SUN4 \| SM_4_330)) {
96ba989d	380	mostek_set_system_time();
1da177e4 LT	381	} else if(idprom->id_machtype == (SM_SUN4 \| SM_4_260) ) {
1da177e4 LT	382	/* initialise the intersil on sun4 */
96ba989d BB	383	unsigned int year, mon, day, hour, min, sec;
	384	int temp;
	385	struct intersil *iregs;
1da177e4 LT	386
	387	iregs=intersil_clock;
	388	if(!iregs) {
	389	prom_printf("Something wrong, clock regs not mapped yet.\n");
	390	prom_halt();
	391	}
	392
	393	intersil_intr(intersil_clock,INTERSIL_INT_100HZ);
	394	disable_pil_irq(10);
	395	intersil_stop(iregs);
	396	intersil_read_intr(intersil_clock, temp);
	397
	398	temp = iregs->clk.int_csec;
	399
	400	sec = iregs->clk.int_sec;
	401	min = iregs->clk.int_min;
	402	hour = iregs->clk.int_hour;
	403	day = iregs->clk.int_day;
	404	mon = iregs->clk.int_month;
	405	year = MSTK_CVT_YEAR(iregs->clk.int_year);
	406
	407	enable_pil_irq(10);
	408	intersil_start(iregs);
	409
	410	xtime.tv_sec = mktime(year, mon, day, hour, min, sec);
	411	xtime.tv_nsec = (INITIAL_JIFFIES % HZ) * (NSEC_PER_SEC / HZ);
	412	set_normalized_timespec(&wall_to_monotonic,
	413	-xtime.tv_sec, -xtime.tv_nsec);
	414	printk("%u/%u/%u %u:%u:%u\n",day,mon,year,hour,min,sec);
	415	}
	416	#endif
	417
	418	/* Now that OBP ticker has been silenced, it is safe to enable IRQ. */
	419	local_irq_enable();
	420	}
	421
	422	void __init time_init(void)
	423	{
	424	#ifdef CONFIG_PCI
	425	extern void pci_time_init(void);
	426	if (pcic_present()) {
	427	pci_time_init();
	428	return;
	429	}
	430	#endif
	431	sbus_time_init();
	432	}
	433
3115624e	434	static inline unsigned long do_gettimeoffset(void)
1da177e4 LT	435	{
	436	return (*master_l10_counter >> 10) & 0x1fffff;
	437	}
	438
	439	/*
	440	* Returns nanoseconds
	441	* XXX This is a suboptimal implementation.
	442	*/
	443	unsigned long long sched_clock(void)
	444	{
	445	return (unsigned long long)jiffies * (1000000000 / HZ);
	446	}
	447
	448	/* Ok, my cute asm atomicity trick doesn't work anymore.
	449	* There are just too many variables that need to be protected
8ef38609	450	* now (both members of xtime, et al.)
1da177e4 LT	451	*/
	452	void do_gettimeofday(struct timeval *tv)
	453	{
	454	unsigned long flags;
	455	unsigned long seq;
	456	unsigned long usec, sec;
	457	unsigned long max_ntp_tick = tick_usec - tickadj;
	458
	459	do {
1da177e4 LT	460	seq = read_seqbegin_irqsave(&xtime_lock, flags);
1da177e4 LT	461	usec = do_gettimeoffset();
1da177e4 LT	462
	463	/*
	464	* If time_adjust is negative then NTP is slowing the clock
	465	* so make sure not to go into next possible interval.
	466	* Better to lose some accuracy than have time go backwards..
	467	*/
8ef38609	468	if (unlikely(time_adjust < 0))
1da177e4 LT	469	usec = min(usec, max_ntp_tick);
1da177e4 LT	470
1da177e4 LT	471	sec = xtime.tv_sec;
	472	usec += (xtime.tv_nsec / 1000);
	473	} while (read_seqretry_irqrestore(&xtime_lock, seq, flags));
	474
	475	while (usec >= 1000000) {
	476	usec -= 1000000;
	477	sec++;
	478	}
	479
	480	tv->tv_sec = sec;
	481	tv->tv_usec = usec;
	482	}
	483
	484	EXPORT_SYMBOL(do_gettimeofday);
	485
	486	int do_settimeofday(struct timespec *tv)
	487	{
	488	int ret;
	489
	490	write_seqlock_irq(&xtime_lock);
	491	ret = bus_do_settimeofday(tv);
	492	write_sequnlock_irq(&xtime_lock);
	493	clock_was_set();
	494	return ret;
	495	}
	496
	497	EXPORT_SYMBOL(do_settimeofday);
	498
	499	static int sbus_do_settimeofday(struct timespec *tv)
	500	{
	501	time_t wtm_sec, sec = tv->tv_sec;
	502	long wtm_nsec, nsec = tv->tv_nsec;
	503
	504	if ((unsigned long)tv->tv_nsec >= NSEC_PER_SEC)
	505	return -EINVAL;
	506
	507	/*
	508	* This is revolting. We need to set "xtime" correctly. However, the
	509	* value in this location is the value at the most recent update of
	510	* wall time. Discover what correction gettimeofday() would have
	511	* made, and then undo it!
	512	*/
8ef38609	513	nsec -= 1000 * do_gettimeoffset();
1da177e4 LT	514
	515	wtm_sec = wall_to_monotonic.tv_sec + (xtime.tv_sec - sec);
	516	wtm_nsec = wall_to_monotonic.tv_nsec + (xtime.tv_nsec - nsec);
	517
	518	set_normalized_timespec(&xtime, sec, nsec);
	519	set_normalized_timespec(&wall_to_monotonic, wtm_sec, wtm_nsec);
	520
b149ee22	521	ntp_clear();
1da177e4 LT	522	return 0;
	523	}
	524
	525	/*
	526	* BUG: This routine does not handle hour overflow properly; it just
	527	* sets the minutes. Usually you won't notice until after reboot!
	528	*/
	529	static int set_rtc_mmss(unsigned long nowtime)
	530	{
	531	int real_seconds, real_minutes, mostek_minutes;
	532	struct mostek48t02 regs = (struct mostek48t02 )mstk48t02_regs;
	533	unsigned long flags;
	534	#ifdef CONFIG_SUN4
	535	struct intersil *iregs = intersil_clock;
	536	int temp;
	537	#endif
	538
	539	/* Not having a register set can lead to trouble. */
	540	if (!regs) {
	541	#ifdef CONFIG_SUN4
	542	if(!iregs)
	543	return -1;
	544	else {
	545	temp = iregs->clk.int_csec;
	546
	547	mostek_minutes = iregs->clk.int_min;
	548
	549	real_seconds = nowtime % 60;
	550	real_minutes = nowtime / 60;
	551	if (((abs(real_minutes - mostek_minutes) + 15)/30) & 1)
	552	real_minutes += 30; /* correct for half hour time zone */
	553	real_minutes %= 60;
	554
	555	if (abs(real_minutes - mostek_minutes) < 30) {
	556	intersil_stop(iregs);
	557	iregs->clk.int_sec=real_seconds;
	558	iregs->clk.int_min=real_minutes;
	559	intersil_start(iregs);
	560	} else {
	561	printk(KERN_WARNING
	562	"set_rtc_mmss: can't update from %d to %d\n",
	563	mostek_minutes, real_minutes);
	564	return -1;
	565	}
	566
	567	return 0;
	568	}
	569	#endif
	570	}
	571
	572	spin_lock_irqsave(&mostek_lock, flags);
	573	/* Read the current RTC minutes. */
	574	regs->creg \|= MSTK_CREG_READ;
	575	mostek_minutes = MSTK_REG_MIN(regs);
	576	regs->creg &= ~MSTK_CREG_READ;
	577
	578	/*
	579	* since we're only adjusting minutes and seconds,
	580	* don't interfere with hour overflow. This avoids
	581	* messing with unknown time zones but requires your
	582	* RTC not to be off by more than 15 minutes
	583	*/
	584	real_seconds = nowtime % 60;
	585	real_minutes = nowtime / 60;
586	if (((abs(real_minutes - mostek_minutes) + 15)/30) & 1)
587	real_minutes += 30; /* correct for half hour time zone */
588	real_minutes %= 60;
589
590	if (abs(real_minutes - mostek_minutes) < 30) {
591	regs->creg \|= MSTK_CREG_WRITE;
592	MSTK_SET_REG_SEC(regs,real_seconds);
593	MSTK_SET_REG_MIN(regs,real_minutes);
594	regs->creg &= ~MSTK_CREG_WRITE;
595	spin_unlock_irqrestore(&mostek_lock, flags);
596	return 0;
597	} else {
598	spin_unlock_irqrestore(&mostek_lock, flags);
599	return -1;
600	}
601	}