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e887b24592
This separates the tick timer stuff from the generic MIPS time.c. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
294 lines
6.9 KiB
C
294 lines
6.9 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/clockchips.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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#define TICK_SIZE (tick_nsec / 1000)
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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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/* 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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unsigned long read_persistent_clock(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 int rt_set_next_event(unsigned long delta,
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struct clock_event_device *evt)
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{
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unsigned int cpu = smp_processor_id();
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int slice = cputoslice(cpu) == 0;
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unsigned long cnt;
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cnt = LOCAL_HUB_L(PI_RT_COUNT);
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cnt += delta;
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LOCAL_HUB_S(slice ? PI_RT_COMPARE_A : PI_RT_COMPARE_B, cnt);
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return LOCAL_HUB_L(PI_RT_COUNT) >= cnt ? -ETIME : 0;
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}
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static void rt_set_mode(enum clock_event_mode mode,
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struct clock_event_device *evt)
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{
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switch (mode) {
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case CLOCK_EVT_MODE_PERIODIC:
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/* The only mode supported */
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break;
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case CLOCK_EVT_MODE_UNUSED:
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case CLOCK_EVT_MODE_SHUTDOWN:
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case CLOCK_EVT_MODE_ONESHOT:
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case CLOCK_EVT_MODE_RESUME:
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/* Nothing to do */
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break;
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}
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}
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struct clock_event_device rt_clock_event_device = {
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.name = "HUB-RT",
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.features = CLOCK_EVT_FEAT_ONESHOT,
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.rating = 300,
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.set_next_event = rt_set_next_event,
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.set_mode = rt_set_mode,
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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 struct irq_chip rt_irq_type = {
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.name = "SN HUB RT timer",
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.ack = disable_rt_irq,
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.mask = disable_rt_irq,
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.mask_ack = disable_rt_irq,
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.unmask = enable_rt_irq,
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.eoi = enable_rt_irq,
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};
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unsigned int rt_timer_irq;
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static irqreturn_t ip27_rt_timer_interrupt(int irq, void *dev_id)
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{
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struct clock_event_device *cd = &rt_clock_event_device;
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unsigned int cpu = smp_processor_id();
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int slice = cputoslice(cpu) == 0;
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LOCAL_HUB_S(slice ? PI_RT_PEND_A : PI_RT_PEND_B, 0); /* Ack */
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cd->event_handler(cd);
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return IRQ_HANDLED;
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}
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static struct irqaction rt_irqaction = {
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.handler = (irq_handler_t) 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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/*
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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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static void __init ip27_rt_clock_event_init(void)
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{
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struct clock_event_device *cd = &rt_clock_event_device;
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unsigned int cpu = smp_processor_id();
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int irq = allocate_irqno();
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if (irq < 0)
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panic("Can't allocate interrupt number for timer interrupt");
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rt_timer_irq = irq;
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cd->irq = irq,
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cd->cpumask = cpumask_of_cpu(cpu),
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/*
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* Calculate the min / max delta
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*/
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cd->mult =
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div_sc((unsigned long) CYCLES_PER_SEC, NSEC_PER_SEC, 32);
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cd->shift = 32;
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cd->max_delta_ns = clockevent_delta2ns(0x7fffffff, cd);
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cd->min_delta_ns = clockevent_delta2ns(0x300, cd);
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clockevents_register_device(cd);
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set_irq_chip_and_handler(irq, &rt_irq_type, handle_percpu_irq);
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setup_irq(irq, &rt_irqaction);
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}
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static cycle_t hub_rt_read(void)
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{
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return REMOTE_HUB_L(cputonasid(0), PI_RT_COUNT);
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}
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struct clocksource ht_rt_clocksource = {
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.name = "HUB-RT",
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.rating = 200,
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.read = hub_rt_read,
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.mask = CLOCKSOURCE_MASK(52),
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.shift = 32,
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.flags = CLOCK_SOURCE_IS_CONTINUOUS,
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};
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static void __init ip27_rt_clocksource_init(void)
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{
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clocksource_register(&ht_rt_clocksource);
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}
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void __init plat_time_init(void)
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{
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ip27_rt_clock_event_init();
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ip27_rt_clocksource_init();
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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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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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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_PEND_B, 0);
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}
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}
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