305 lines
7.2 KiB
C
305 lines
7.2 KiB
C
/*
|
|
* Copytight (C) 1999, 2000, 05, 06 Ralf Baechle (ralf@linux-mips.org)
|
|
* Copytight (C) 1999, 2000 Silicon Graphics, Inc.
|
|
*/
|
|
#include <linux/bcd.h>
|
|
#include <linux/clockchips.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/time.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>
|
|
|
|
#define TICK_SIZE (tick_nsec / 1000)
|
|
|
|
#if 0
|
|
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 = BCD2BIN(rtc->min);
|
|
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) {
|
|
real_seconds = BIN2BCD(real_seconds);
|
|
real_minutes = BIN2BCD(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;
|
|
}
|
|
#endif
|
|
|
|
/* 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>
|
|
|
|
unsigned long read_persistent_clock(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;
|
|
|
|
sec = BCD2BIN(sec);
|
|
min = BCD2BIN(min);
|
|
hour = BCD2BIN(hour);
|
|
date = BCD2BIN(date);
|
|
month = BCD2BIN(month);
|
|
year = BCD2BIN(year);
|
|
|
|
year += 1970;
|
|
|
|
return mktime(year, month, date, hour, min, sec);
|
|
}
|
|
|
|
static void enable_rt_irq(unsigned int irq)
|
|
{
|
|
}
|
|
|
|
static void disable_rt_irq(unsigned int irq)
|
|
{
|
|
}
|
|
|
|
static struct irq_chip rt_irq_type = {
|
|
.name = "SN HUB RT timer",
|
|
.ack = disable_rt_irq,
|
|
.mask = disable_rt_irq,
|
|
.mask_ack = disable_rt_irq,
|
|
.unmask = enable_rt_irq,
|
|
.eoi = enable_rt_irq,
|
|
};
|
|
|
|
static int rt_next_event(unsigned long delta, struct clock_event_device *evt)
|
|
{
|
|
unsigned int cpu = smp_processor_id();
|
|
int slice = cputoslice(cpu);
|
|
unsigned long cnt;
|
|
|
|
cnt = LOCAL_HUB_L(PI_RT_COUNT);
|
|
cnt += delta;
|
|
LOCAL_HUB_S(PI_RT_COMPARE_A + PI_COUNT_OFFSET * slice, cnt);
|
|
|
|
return LOCAL_HUB_L(PI_RT_COUNT) >= cnt ? -ETIME : 0;
|
|
}
|
|
|
|
static void rt_set_mode(enum clock_event_mode mode,
|
|
struct clock_event_device *evt)
|
|
{
|
|
switch (mode) {
|
|
case CLOCK_EVT_MODE_ONESHOT:
|
|
/* The only mode supported */
|
|
break;
|
|
|
|
case CLOCK_EVT_MODE_PERIODIC:
|
|
case CLOCK_EVT_MODE_UNUSED:
|
|
case CLOCK_EVT_MODE_SHUTDOWN:
|
|
case CLOCK_EVT_MODE_RESUME:
|
|
/* Nothing to do */
|
|
break;
|
|
}
|
|
}
|
|
|
|
int rt_timer_irq;
|
|
|
|
static irqreturn_t hub_rt_counter_handler(int irq, void *dev_id)
|
|
{
|
|
struct clock_event_device *cd = dev_id;
|
|
unsigned int cpu = smp_processor_id();
|
|
int slice = cputoslice(cpu);
|
|
|
|
/*
|
|
* Ack
|
|
*/
|
|
LOCAL_HUB_S(PI_RT_PEND_A + PI_COUNT_OFFSET * slice, 0);
|
|
cd->event_handler(cd);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
struct irqaction hub_rt_irqaction = {
|
|
.handler = hub_rt_counter_handler,
|
|
.flags = IRQF_DISABLED | IRQF_PERCPU,
|
|
.name = "hub-rt",
|
|
};
|
|
|
|
/*
|
|
* 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 CYCLES_PER_SEC (NSEC_PER_SEC / NSEC_PER_CYCLE)
|
|
|
|
static DEFINE_PER_CPU(struct clock_event_device, hub_rt_clockevent);
|
|
static DEFINE_PER_CPU(char [11], hub_rt_name);
|
|
|
|
static void __cpuinit hub_rt_clock_event_init(void)
|
|
{
|
|
unsigned int cpu = smp_processor_id();
|
|
struct clock_event_device *cd = &per_cpu(hub_rt_clockevent, cpu);
|
|
unsigned char *name = per_cpu(hub_rt_name, cpu);
|
|
int irq = rt_timer_irq;
|
|
|
|
sprintf(name, "hub-rt %d", cpu);
|
|
cd->name = "HUB-RT",
|
|
cd->features = CLOCK_EVT_FEAT_ONESHOT,
|
|
clockevent_set_clock(cd, CYCLES_PER_SEC);
|
|
cd->max_delta_ns = clockevent_delta2ns(0xfffffffffffff, cd);
|
|
cd->min_delta_ns = clockevent_delta2ns(0x300, cd);
|
|
cd->rating = 200,
|
|
cd->irq = irq,
|
|
cd->cpumask = cpumask_of_cpu(cpu),
|
|
cd->rating = 300,
|
|
cd->set_next_event = rt_next_event,
|
|
cd->set_mode = rt_set_mode,
|
|
clockevents_register_device(cd);
|
|
}
|
|
|
|
static void __init hub_rt_clock_event_global_init(void)
|
|
{
|
|
int irq;
|
|
|
|
do {
|
|
smp_wmb();
|
|
irq = rt_timer_irq;
|
|
if (irq)
|
|
break;
|
|
|
|
irq = allocate_irqno();
|
|
if (irq < 0)
|
|
panic("Allocation of irq number for timer failed");
|
|
} while (xchg(&rt_timer_irq, irq));
|
|
|
|
set_irq_chip_and_handler(irq, &rt_irq_type, handle_percpu_irq);
|
|
setup_irq(irq, &hub_rt_irqaction);
|
|
}
|
|
|
|
static cycle_t hub_rt_read(void)
|
|
{
|
|
return REMOTE_HUB_L(cputonasid(0), PI_RT_COUNT);
|
|
}
|
|
|
|
struct clocksource hub_rt_clocksource = {
|
|
.name = "HUB-RT",
|
|
.rating = 200,
|
|
.read = hub_rt_read,
|
|
.mask = CLOCKSOURCE_MASK(52),
|
|
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
|
|
};
|
|
|
|
static void __init hub_rt_clocksource_init(void)
|
|
{
|
|
struct clocksource *cs = &hub_rt_clocksource;
|
|
|
|
clocksource_set_clock(cs, CYCLES_PER_SEC);
|
|
clocksource_register(cs);
|
|
}
|
|
|
|
void __init plat_time_init(void)
|
|
{
|
|
hub_rt_clocksource_init();
|
|
hub_rt_clock_event_global_init();
|
|
}
|
|
|
|
void __cpuinit 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);
|
|
|
|
hub_rt_clock_event_init();
|
|
set_c0_status(SRB_TIMOCLK);
|
|
}
|
|
|
|
void __cpuinit 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) {
|
|
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);
|
|
LOCAL_HUB_S(PI_RT_COUNT, 0);
|
|
LOCAL_HUB_S(PI_RT_PEND_A, 0);
|
|
LOCAL_HUB_S(PI_RT_PEND_B, 0);
|
|
}
|
|
}
|