mirror of https://gitee.com/openkylin/linux.git
[MIPS] IP27: Convert to clock_event_device.
This separates the tick timer stuff from the generic MIPS time.c. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Ralf Baechle
parent
832348ff0b
commit
e887b24592
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@ -374,14 +374,13 @@ int __devinit request_bridge_irq(struct bridge_controller *bc)
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return irq;
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}
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extern void ip27_rt_timer_interrupt(void);
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asmlinkage void plat_irq_dispatch(void)
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{
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unsigned long pending = read_c0_cause() & read_c0_status();
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extern unsigned int rt_timer_irq;
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if (pending & CAUSEF_IP4)
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ip27_rt_timer_interrupt();
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do_IRQ(rt_timer_irq);
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else if (pending & CAUSEF_IP2) /* PI_INT_PEND_0 or CC_PEND_{A|B} */
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ip27_do_irq_mask0();
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else if (pending & CAUSEF_IP3) /* PI_INT_PEND_1 */
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@ -3,6 +3,7 @@
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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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@ -25,22 +26,8 @@
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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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#if 0
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static int set_rtc_mmss(unsigned long nowtime)
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{
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@ -86,36 +73,6 @@ static int set_rtc_mmss(unsigned long nowtime)
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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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write_sequnlock(&xtime_lock);
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irq_exit();
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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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@ -154,6 +111,46 @@ unsigned long read_persistent_clock(void)
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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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@ -171,6 +168,20 @@ static struct irq_chip rt_irq_type = {
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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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@ -178,26 +189,43 @@ static struct irqaction rt_irqaction = {
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.name = "timer"
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};
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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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/*
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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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if (irqno < 0)
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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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set_irq_chip_and_handler(irqno, &rt_irq_type, handle_percpu_irq);
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rt_timer_irq = irq;
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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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cd->irq = irq,
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cd->cpumask = cpumask_of_cpu(cpu),
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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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* Calculate the min / max delta
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*/
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setup_irq(irqno, &rt_irqaction);
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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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@ -206,7 +234,7 @@ static cycle_t hub_rt_read(void)
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}
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struct clocksource ht_rt_clocksource = {
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.name = "HUB",
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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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@ -214,11 +242,17 @@ struct clocksource ht_rt_clocksource = {
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.flags = CLOCK_SOURCE_IS_CONTINUOUS,
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};
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void __init plat_time_init(void)
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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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@ -248,17 +282,12 @@ void __init hub_rtc_init(cnodeid_t cnode)
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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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