302 lines
7.3 KiB
C
302 lines
7.3 KiB
C
/*
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* Copytight (C) 1999, 2000, 05, 06 Ralf Baechle (ralf@linux-mips.org)
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* Copytight (C) 1999, 2000 Silicon Graphics, Inc.
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*/
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#include <linux/bcd.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/interrupt.h>
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#include <linux/kernel_stat.h>
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#include <linux/param.h>
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#include <linux/time.h>
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#include <linux/timex.h>
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#include <linux/mm.h>
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#include <asm/time.h>
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#include <asm/pgtable.h>
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#include <asm/sgialib.h>
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#include <asm/sn/ioc3.h>
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#include <asm/m48t35.h>
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#include <asm/sn/klconfig.h>
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#include <asm/sn/arch.h>
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#include <asm/sn/addrs.h>
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#include <asm/sn/sn_private.h>
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#include <asm/sn/sn0/ip27.h>
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#include <asm/sn/sn0/hub.h>
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/*
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* This is a hack; we really need to figure these values out dynamically
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*
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* Since 800 ns works very well with various HUB frequencies, such as
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* 360, 380, 390 and 400 MHZ, we use 800 ns rtc cycle time.
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*
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* Ralf: which clock rate is used to feed the counter?
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*/
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#define NSEC_PER_CYCLE 800
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#define CYCLES_PER_SEC (NSEC_PER_SEC/NSEC_PER_CYCLE)
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#define CYCLES_PER_JIFFY (CYCLES_PER_SEC/HZ)
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#define TICK_SIZE (tick_nsec / 1000)
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static unsigned long ct_cur[NR_CPUS]; /* What counter should be at next timer irq */
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static long last_rtc_update; /* Last time the rtc clock got updated */
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#if 0
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static int set_rtc_mmss(unsigned long nowtime)
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{
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int retval = 0;
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int real_seconds, real_minutes, cmos_minutes;
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struct m48t35_rtc *rtc;
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nasid_t nid;
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nid = get_nasid();
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rtc = (struct m48t35_rtc *)(KL_CONFIG_CH_CONS_INFO(nid)->memory_base +
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IOC3_BYTEBUS_DEV0);
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rtc->control |= M48T35_RTC_READ;
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cmos_minutes = BCD2BIN(rtc->min);
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rtc->control &= ~M48T35_RTC_READ;
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/*
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* Since we're only adjusting minutes and seconds, don't interfere with
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* hour overflow. This avoids messing with unknown time zones but
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* requires your RTC not to be off by more than 15 minutes
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*/
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real_seconds = nowtime % 60;
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real_minutes = nowtime / 60;
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if (((abs(real_minutes - cmos_minutes) + 15)/30) & 1)
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real_minutes += 30; /* correct for half hour time zone */
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real_minutes %= 60;
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if (abs(real_minutes - cmos_minutes) < 30) {
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real_seconds = BIN2BCD(real_seconds);
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real_minutes = BIN2BCD(real_minutes);
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rtc->control |= M48T35_RTC_SET;
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rtc->sec = real_seconds;
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rtc->min = real_minutes;
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rtc->control &= ~M48T35_RTC_SET;
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} else {
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printk(KERN_WARNING
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"set_rtc_mmss: can't update from %d to %d\n",
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cmos_minutes, real_minutes);
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retval = -1;
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}
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return retval;
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}
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#endif
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static unsigned int rt_timer_irq;
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void ip27_rt_timer_interrupt(void)
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{
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int cpu = smp_processor_id();
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int cpuA = cputoslice(cpu) == 0;
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unsigned int irq = rt_timer_irq;
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irq_enter();
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write_seqlock(&xtime_lock);
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again:
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LOCAL_HUB_S(cpuA ? PI_RT_PEND_A : PI_RT_PEND_B, 0); /* Ack */
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ct_cur[cpu] += CYCLES_PER_JIFFY;
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LOCAL_HUB_S(cpuA ? PI_RT_COMPARE_A : PI_RT_COMPARE_B, ct_cur[cpu]);
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if (LOCAL_HUB_L(PI_RT_COUNT) >= ct_cur[cpu])
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goto again;
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kstat_this_cpu.irqs[irq]++; /* kstat only for bootcpu? */
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if (cpu == 0)
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do_timer(1);
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update_process_times(user_mode(get_irq_regs()));
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/*
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* If we have an externally synchronized Linux clock, then update
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* RTC clock accordingly every ~11 minutes. Set_rtc_mmss() has to be
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* called as close as possible to when a second starts.
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*/
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if (ntp_synced() &&
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xtime.tv_sec > last_rtc_update + 660 &&
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(xtime.tv_nsec / 1000) >= 500000 - ((unsigned) TICK_SIZE) / 2 &&
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(xtime.tv_nsec / 1000) <= 500000 + ((unsigned) TICK_SIZE) / 2) {
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if (rtc_mips_set_time(xtime.tv_sec) == 0) {
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last_rtc_update = xtime.tv_sec;
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} else {
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last_rtc_update = xtime.tv_sec - 600;
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/* do it again in 60 s */
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}
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}
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write_sequnlock(&xtime_lock);
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irq_exit();
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}
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unsigned long ip27_do_gettimeoffset(void)
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{
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unsigned long ct_cur1;
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ct_cur1 = REMOTE_HUB_L(cputonasid(0), PI_RT_COUNT) + CYCLES_PER_JIFFY;
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return (ct_cur1 - ct_cur[0]) * NSEC_PER_CYCLE / 1000;
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}
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/* Includes for ioc3_init(). */
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#include <asm/sn/types.h>
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#include <asm/sn/sn0/addrs.h>
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#include <asm/sn/sn0/hubni.h>
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#include <asm/sn/sn0/hubio.h>
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#include <asm/pci/bridge.h>
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static __init unsigned long get_m48t35_time(void)
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{
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unsigned int year, month, date, hour, min, sec;
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struct m48t35_rtc *rtc;
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nasid_t nid;
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nid = get_nasid();
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rtc = (struct m48t35_rtc *)(KL_CONFIG_CH_CONS_INFO(nid)->memory_base +
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IOC3_BYTEBUS_DEV0);
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rtc->control |= M48T35_RTC_READ;
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sec = rtc->sec;
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min = rtc->min;
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hour = rtc->hour;
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date = rtc->date;
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month = rtc->month;
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year = rtc->year;
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rtc->control &= ~M48T35_RTC_READ;
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sec = BCD2BIN(sec);
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min = BCD2BIN(min);
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hour = BCD2BIN(hour);
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date = BCD2BIN(date);
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month = BCD2BIN(month);
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year = BCD2BIN(year);
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year += 1970;
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return mktime(year, month, date, hour, min, sec);
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}
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static unsigned int startup_rt_irq(unsigned int irq)
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{
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return 0;
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}
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static void shutdown_rt_irq(unsigned int irq)
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{
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}
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static void enable_rt_irq(unsigned int irq)
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{
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}
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static void disable_rt_irq(unsigned int irq)
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{
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}
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static void mask_and_ack_rt(unsigned int irq)
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{
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}
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static void end_rt_irq(unsigned int irq)
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{
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}
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static struct irq_chip rt_irq_type = {
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.typename = "SN HUB RT timer",
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.startup = startup_rt_irq,
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.shutdown = shutdown_rt_irq,
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.enable = enable_rt_irq,
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.disable = disable_rt_irq,
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.ack = mask_and_ack_rt,
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.end = end_rt_irq,
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};
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static struct irqaction rt_irqaction = {
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.handler = ip27_rt_timer_interrupt,
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.flags = IRQF_DISABLED,
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.mask = CPU_MASK_NONE,
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.name = "timer"
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};
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extern int allocate_irqno(void);
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void __init plat_timer_setup(struct irqaction *irq)
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{
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int irqno = allocate_irqno();
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if (irqno < 0)
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panic("Can't allocate interrupt number for timer interrupt");
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irq_desc[irqno].status = IRQ_DISABLED;
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irq_desc[irqno].action = NULL;
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irq_desc[irqno].depth = 1;
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irq_desc[irqno].chip = &rt_irq_type;
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/* over-write the handler, we use our own way */
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irq->handler = no_action;
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/* setup irqaction */
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irq_desc[irqno].status |= IRQ_PER_CPU;
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rt_timer_irq = irqno;
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/*
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* Only needed to get /proc/interrupt to display timer irq stats
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*/
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setup_irq(irqno, &rt_irqaction);
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}
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void __init ip27_time_init(void)
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{
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xtime.tv_sec = get_m48t35_time();
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xtime.tv_nsec = 0;
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do_gettimeoffset = ip27_do_gettimeoffset;
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}
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void __init cpu_time_init(void)
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{
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lboard_t *board;
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klcpu_t *cpu;
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int cpuid;
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/* Don't use ARCS. ARCS is fragile. Klconfig is simple and sane. */
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board = find_lboard(KL_CONFIG_INFO(get_nasid()), KLTYPE_IP27);
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if (!board)
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panic("Can't find board info for myself.");
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cpuid = LOCAL_HUB_L(PI_CPU_NUM) ? IP27_CPU0_INDEX : IP27_CPU1_INDEX;
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cpu = (klcpu_t *) KLCF_COMP(board, cpuid);
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if (!cpu)
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panic("No information about myself?");
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printk("CPU %d clock is %dMHz.\n", smp_processor_id(), cpu->cpu_speed);
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set_c0_status(SRB_TIMOCLK);
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}
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void __init hub_rtc_init(cnodeid_t cnode)
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{
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/*
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* We only need to initialize the current node.
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* If this is not the current node then it is a cpuless
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* node and timeouts will not happen there.
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*/
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if (get_compact_nodeid() == cnode) {
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int cpu = smp_processor_id();
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LOCAL_HUB_S(PI_RT_EN_A, 1);
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LOCAL_HUB_S(PI_RT_EN_B, 1);
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LOCAL_HUB_S(PI_PROF_EN_A, 0);
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LOCAL_HUB_S(PI_PROF_EN_B, 0);
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ct_cur[cpu] = CYCLES_PER_JIFFY;
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LOCAL_HUB_S(PI_RT_COMPARE_A, ct_cur[cpu]);
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LOCAL_HUB_S(PI_RT_COUNT, 0);
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LOCAL_HUB_S(PI_RT_PEND_A, 0);
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LOCAL_HUB_S(PI_RT_COMPARE_B, ct_cur[cpu]);
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LOCAL_HUB_S(PI_RT_COUNT, 0);
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LOCAL_HUB_S(PI_RT_PEND_B, 0);
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}
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}
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