300 lines
7.2 KiB
C
300 lines
7.2 KiB
C
/*
|
|
* Copytight (C) 1999, 2000, 05 Ralf Baechle (ralf@linux-mips.org)
|
|
* Copytight (C) 1999, 2000 Silicon Graphics, Inc.
|
|
*/
|
|
#include <linux/bcd.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>
|
|
|
|
/*
|
|
* 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)
|
|
#define CYCLES_PER_JIFFY (CYCLES_PER_SEC/HZ)
|
|
|
|
#define TICK_SIZE (tick_nsec / 1000)
|
|
|
|
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 volatile unsigned long wall_jiffies;
|
|
|
|
#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
|
|
|
|
static unsigned int rt_timer_irq;
|
|
|
|
void ip27_rt_timer_interrupt(struct pt_regs *regs)
|
|
{
|
|
int cpu = smp_processor_id();
|
|
int cpuA = cputoslice(cpu) == 0;
|
|
unsigned int irq = rt_timer_irq;
|
|
|
|
irq_enter();
|
|
write_seqlock(&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_this_cpu.irqs[irq]++; /* kstat only for bootcpu? */
|
|
|
|
if (cpu == 0)
|
|
do_timer(regs);
|
|
|
|
update_process_times(user_mode(regs));
|
|
|
|
/*
|
|
* 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 (ntp_synced() &&
|
|
xtime.tv_sec > last_rtc_update + 660 &&
|
|
(xtime.tv_nsec / 1000) >= 500000 - ((unsigned) TICK_SIZE) / 2 &&
|
|
(xtime.tv_nsec / 1000) <= 500000 + ((unsigned) TICK_SIZE) / 2) {
|
|
if (rtc_mips_set_time(xtime.tv_sec) == 0) {
|
|
last_rtc_update = xtime.tv_sec;
|
|
} else {
|
|
last_rtc_update = xtime.tv_sec - 600;
|
|
/* do it again in 60 s */
|
|
}
|
|
}
|
|
|
|
write_sequnlock(&xtime_lock);
|
|
irq_exit();
|
|
}
|
|
|
|
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;
|
|
|
|
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 startup_rt_irq(unsigned int irq)
|
|
{
|
|
}
|
|
|
|
static void shutdown_rt_irq(unsigned int irq)
|
|
{
|
|
}
|
|
|
|
static void enable_rt_irq(unsigned int irq)
|
|
{
|
|
}
|
|
|
|
static void disable_rt_irq(unsigned int irq)
|
|
{
|
|
}
|
|
|
|
static void mask_and_ack_rt(unsigned int irq)
|
|
{
|
|
}
|
|
|
|
static void end_rt_irq(unsigned int irq)
|
|
{
|
|
}
|
|
|
|
static struct hw_interrupt_type rt_irq_type = {
|
|
.typename = "SN HUB RT timer",
|
|
.startup = startup_rt_irq,
|
|
.shutdown = shutdown_rt_irq,
|
|
.enable = enable_rt_irq,
|
|
.disable = disable_rt_irq,
|
|
.ack = mask_and_ack_rt,
|
|
.end = end_rt_irq,
|
|
};
|
|
|
|
static struct irqaction rt_irqaction = {
|
|
.handler = ip27_rt_timer_interrupt,
|
|
.flags = SA_INTERRUPT,
|
|
.mask = CPU_MASK_NONE,
|
|
.name = "timer"
|
|
};
|
|
|
|
extern int allocate_irqno(void);
|
|
|
|
static void ip27_timer_setup(struct irqaction *irq)
|
|
{
|
|
int irqno = allocate_irqno();
|
|
|
|
if (irqno < 0)
|
|
panic("Can't allocate interrupt number for timer interrupt");
|
|
|
|
irq_desc[irqno].status = IRQ_DISABLED;
|
|
irq_desc[irqno].action = NULL;
|
|
irq_desc[irqno].depth = 1;
|
|
irq_desc[irqno].handler = &rt_irq_type;
|
|
|
|
/* over-write the handler, we use our own way */
|
|
irq->handler = no_action;
|
|
|
|
/* setup irqaction */
|
|
irq_desc[irqno].status |= IRQ_PER_CPU;
|
|
|
|
rt_timer_irq = irqno;
|
|
}
|
|
|
|
void __init ip27_time_init(void)
|
|
{
|
|
xtime.tv_sec = get_m48t35_time();
|
|
xtime.tv_nsec = 0;
|
|
|
|
do_gettimeoffset = ip27_do_gettimeoffset;
|
|
|
|
board_timer_setup = ip27_timer_setup;
|
|
}
|
|
|
|
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_c0_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);
|
|
}
|
|
}
|