patch-2.4.20 linux-2.4.20/arch/mips64/sgi-ip27/ip27-timer.c

• Lines: 240
• Date: Wed Dec 31 16:00:00 1969
• Orig file: linux-2.4.19/arch/mips64/sgi-ip27/ip27-timer.c
• Orig date: Fri Aug 2 17:39:43 2002

diff -urN linux-2.4.19/arch/mips64/sgi-ip27/ip27-timer.c linux-2.4.20/arch/mips64/sgi-ip27/ip27-timer.c
@@ -1,239 +0,0 @@
-/*
- * Copytight (C) 1999, 2000 Ralf Baechle (ralf@gnu.org)
- * Copytight (C) 1999, 2000 Silicon Graphics, Inc.
- */
-#include <linux/config.h>
-#include <linux/init.h>
-#include <linux/kernel.h>
-#include <linux/sched.h>
-#include <linux/interrupt.h>
-#include <linux/kernel_stat.h>
-#include <linux/param.h>
-#include <linux/timex.h>
-#include <linux/mm.h>		
-
-#include <asm/time.h>
-#include <asm/pgtable.h>
-#include <asm/sgialib.h>
-#include <asm/sn/ioc3.h>
-#include <asm/m48t35.h>
-#include <asm/sn/klconfig.h>
-#include <asm/sn/arch.h>
-#include <asm/sn/addrs.h>
-#include <asm/sn/sn_private.h>
-#include <asm/sn/sn0/ip27.h>
-#include <asm/sn/sn0/hub.h>
-
-/*
- * This is a hack; we really need to figure these values out dynamically
- * 
- * Since 800 ns works very well with various HUB frequencies, such as
- * 360, 380, 390 and 400 MHZ, we use 800 ns rtc cycle time.
- *
- * Ralf: which clock rate is used to feed the counter?
- */
-#define NSEC_PER_CYCLE		800
-#define NSEC_PER_SEC		1000000000
-#define CYCLES_PER_SEC		(NSEC_PER_SEC/NSEC_PER_CYCLE)
-#define CYCLES_PER_JIFFY	(CYCLES_PER_SEC/HZ)
-
-static unsigned long ct_cur[NR_CPUS];	/* What counter should be at next timer irq */
-static long last_rtc_update;		/* Last time the rtc clock got updated */
-
-extern rwlock_t xtime_lock;
-extern volatile unsigned long wall_jiffies;
-
-
-static int set_rtc_mmss(unsigned long nowtime)
-{
-	int retval = 0;
-	int real_seconds, real_minutes, cmos_minutes;
-	struct m48t35_rtc *rtc;
-	nasid_t nid;
-
-	nid = get_nasid();
-	rtc = (struct m48t35_rtc *)(KL_CONFIG_CH_CONS_INFO(nid)->memory_base + 
-							IOC3_BYTEBUS_DEV0);
-
-	rtc->control |= M48T35_RTC_READ;
-	cmos_minutes = rtc->min;
-	BCD_TO_BIN(cmos_minutes);
-	rtc->control &= ~M48T35_RTC_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 - cmos_minutes) + 15)/30) & 1)
-		real_minutes += 30;	/* correct for half hour time zone */
-	real_minutes %= 60;
-
-	if (abs(real_minutes - cmos_minutes) < 30) {
-		BIN_TO_BCD(real_seconds);
-		BIN_TO_BCD(real_minutes);
-		rtc->control |= M48T35_RTC_SET;
-		rtc->sec = real_seconds;
-		rtc->min = real_minutes;
-		rtc->control &= ~M48T35_RTC_SET;
-	} else {
-		printk(KERN_WARNING
-		       "set_rtc_mmss: can't update from %d to %d\n",
-		       cmos_minutes, real_minutes);
-		retval = -1;
-	}
-
-	return retval;
-}
-
-void rt_timer_interrupt(struct pt_regs *regs)
-{
-	int cpu = smp_processor_id();
-	int cpuA = ((cputoslice(cpu)) == 0);
-	int irq = 9;				/* XXX Assign number */
-
-	irq_enter(cpu, irq);
-	write_lock(&xtime_lock);
-
-again:
-	LOCAL_HUB_S(cpuA ? PI_RT_PEND_A : PI_RT_PEND_B, 0);	/* Ack  */
-	ct_cur[cpu] += CYCLES_PER_JIFFY;
-	LOCAL_HUB_S(cpuA ? PI_RT_COMPARE_A : PI_RT_COMPARE_B, ct_cur[cpu]);
-
-	if (LOCAL_HUB_L(PI_RT_COUNT) >= ct_cur[cpu])
-		goto again;
-
-	kstat.irqs[cpu][irq]++;		/* kstat only for bootcpu? */
-
-	if (cpu == 0)
-		do_timer(regs);
-
-#ifdef CONFIG_SMP
-	update_process_times(user_mode(regs));
-#endif /* CONFIG_SMP */
-	
-	/*
-	 * If we have an externally synchronized Linux clock, then update
-	 * RTC clock accordingly every ~11 minutes. Set_rtc_mmss() has to be
-	 * called as close as possible to when a second starts.
-	 */
-	if ((time_status & STA_UNSYNC) == 0 &&
-	    xtime.tv_sec > last_rtc_update + 660) {
-		if (xtime.tv_usec >= 1000000 - ((unsigned) tick) / 2) {
-			if (set_rtc_mmss(xtime.tv_sec + 1) == 0)
-				last_rtc_update = xtime.tv_sec;
-			else    
-				last_rtc_update = xtime.tv_sec - 600;
-		} else if (xtime.tv_usec <= ((unsigned) tick) / 2) {
-			if (set_rtc_mmss(xtime.tv_sec) == 0)
-				last_rtc_update = xtime.tv_sec;
-			else    
-				last_rtc_update = xtime.tv_sec - 600;
-		}
-        }
-
-	write_unlock(&xtime_lock);
-	irq_exit(cpu, irq);
-
-	if (softirq_pending(cpu))
-		do_softirq();
-}
-
-unsigned long ip27_do_gettimeoffset(void)
-{
-	unsigned long ct_cur1;
-	ct_cur1 = REMOTE_HUB_L(cputonasid(0), PI_RT_COUNT) + CYCLES_PER_JIFFY;
-	return (ct_cur1 - ct_cur[0]) * NSEC_PER_CYCLE / 1000;
-}
-
-/* Includes for ioc3_init().  */
-#include <asm/sn/types.h>
-#include <asm/sn/sn0/addrs.h>
-#include <asm/sn/sn0/hubni.h>
-#include <asm/sn/sn0/hubio.h>
-#include <asm/pci/bridge.h>
-
-static __init unsigned long get_m48t35_time(void)
-{
-        unsigned int year, month, date, hour, min, sec;
-	struct m48t35_rtc *rtc;
-	nasid_t nid;
-
-	nid = get_nasid();
-	rtc = (struct m48t35_rtc *)(KL_CONFIG_CH_CONS_INFO(nid)->memory_base + 
-							IOC3_BYTEBUS_DEV0);
-
-	rtc->control |= M48T35_RTC_READ;
-	sec = rtc->sec;
-	min = rtc->min;
-	hour = rtc->hour;
-	date = rtc->date;
-	month = rtc->month;
-	year = rtc->year;
-	rtc->control &= ~M48T35_RTC_READ;
-
-        BCD_TO_BIN(sec);
-        BCD_TO_BIN(min);
-        BCD_TO_BIN(hour);
-        BCD_TO_BIN(date);
-        BCD_TO_BIN(month);
-        BCD_TO_BIN(year);
-
-        year += 1970;
-
-        return mktime(year, month, date, hour, min, sec);
-}
-
-void __init ip27_time_init(void)
-{
-	xtime.tv_sec = get_m48t35_time();
-	xtime.tv_usec = 0;
-
-	do_gettimeoffset = ip27_do_gettimeoffset;
-}
-
-void __init cpu_time_init(void)
-{
-	lboard_t *board;
-	klcpu_t *cpu;
-	int cpuid;
-
-	/* Don't use ARCS.  ARCS is fragile.  Klconfig is simple and sane.  */
-	board = find_lboard(KL_CONFIG_INFO(get_nasid()), KLTYPE_IP27);
-	if (!board)
-		panic("Can't find board info for myself.");
-
-	cpuid = LOCAL_HUB_L(PI_CPU_NUM) ? IP27_CPU0_INDEX : IP27_CPU1_INDEX;
-	cpu = (klcpu_t *) KLCF_COMP(board, cpuid);
-	if (!cpu)
-		panic("No information about myself?");
-
-	printk("CPU %d clock is %dMHz.\n", smp_processor_id(), cpu->cpu_speed);
-
-	set_cp0_status(SRB_TIMOCLK);
-}
-
-void __init hub_rtc_init(cnodeid_t cnode)
-{
-	/*
-	 * We only need to initialize the current node.
-	 * If this is not the current node then it is a cpuless
-	 * node and timeouts will not happen there.
-	 */
-	if (get_compact_nodeid() == cnode) {
-		int cpu = smp_processor_id();
-		LOCAL_HUB_S(PI_RT_EN_A, 1);
-		LOCAL_HUB_S(PI_RT_EN_B, 1);
-		LOCAL_HUB_S(PI_PROF_EN_A, 0);
-		LOCAL_HUB_S(PI_PROF_EN_B, 0);
-		ct_cur[cpu] = CYCLES_PER_JIFFY;
-		LOCAL_HUB_S(PI_RT_COMPARE_A, ct_cur[cpu]);
-		LOCAL_HUB_S(PI_RT_COUNT, 0);
-		LOCAL_HUB_S(PI_RT_PEND_A, 0);
-		LOCAL_HUB_S(PI_RT_COMPARE_B, ct_cur[cpu]);
-		LOCAL_HUB_S(PI_RT_COUNT, 0);
-		LOCAL_HUB_S(PI_RT_PEND_B, 0);
-	}
-}