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-rw-r--r--arch/sparc/kernel/time.c633
1 files changed, 0 insertions, 633 deletions
diff --git a/arch/sparc/kernel/time.c b/arch/sparc/kernel/time.c
deleted file mode 100644
index 24814d58f9e..00000000000
--- a/arch/sparc/kernel/time.c
+++ /dev/null
@@ -1,633 +0,0 @@
-/* $Id: time.c,v 1.60 2002/01/23 14:33:55 davem Exp $
- * linux/arch/sparc/kernel/time.c
- *
- * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
- * Copyright (C) 1996 Thomas K. Dyas (tdyas@eden.rutgers.edu)
- *
- * Chris Davis (cdavis@cois.on.ca) 03/27/1998
- * Added support for the intersil on the sun4/4200
- *
- * Gleb Raiko (rajko@mech.math.msu.su) 08/18/1998
- * Support for MicroSPARC-IIep, PCI CPU.
- *
- * This file handles the Sparc specific time handling details.
- *
- * 1997-09-10 Updated NTP code according to technical memorandum Jan '96
- * "A Kernel Model for Precision Timekeeping" by Dave Mills
- */
-#include <linux/config.h>
-#include <linux/errno.h>
-#include <linux/module.h>
-#include <linux/sched.h>
-#include <linux/kernel.h>
-#include <linux/param.h>
-#include <linux/string.h>
-#include <linux/mm.h>
-#include <linux/interrupt.h>
-#include <linux/time.h>
-#include <linux/timex.h>
-#include <linux/init.h>
-#include <linux/pci.h>
-#include <linux/ioport.h>
-#include <linux/profile.h>
-
-#include <asm/oplib.h>
-#include <asm/timer.h>
-#include <asm/mostek.h>
-#include <asm/system.h>
-#include <asm/irq.h>
-#include <asm/io.h>
-#include <asm/idprom.h>
-#include <asm/machines.h>
-#include <asm/sun4paddr.h>
-#include <asm/page.h>
-#include <asm/pcic.h>
-
-extern unsigned long wall_jiffies;
-
-DEFINE_SPINLOCK(rtc_lock);
-enum sparc_clock_type sp_clock_typ;
-DEFINE_SPINLOCK(mostek_lock);
-void __iomem *mstk48t02_regs = NULL;
-static struct mostek48t08 *mstk48t08_regs = NULL;
-static int set_rtc_mmss(unsigned long);
-static int sbus_do_settimeofday(struct timespec *tv);
-
-#ifdef CONFIG_SUN4
-struct intersil *intersil_clock;
-#define intersil_cmd(intersil_reg, intsil_cmd) intersil_reg->int_cmd_reg = \
- (intsil_cmd)
-
-#define intersil_intr(intersil_reg, intsil_cmd) intersil_reg->int_intr_reg = \
- (intsil_cmd)
-
-#define intersil_start(intersil_reg) intersil_cmd(intersil_reg, \
- ( INTERSIL_START | INTERSIL_32K | INTERSIL_NORMAL | INTERSIL_24H |\
- INTERSIL_INTR_ENABLE))
-
-#define intersil_stop(intersil_reg) intersil_cmd(intersil_reg, \
- ( INTERSIL_STOP | INTERSIL_32K | INTERSIL_NORMAL | INTERSIL_24H |\
- INTERSIL_INTR_ENABLE))
-
-#define intersil_read_intr(intersil_reg, towhere) towhere = \
- intersil_reg->int_intr_reg
-
-#endif
-
-unsigned long profile_pc(struct pt_regs *regs)
-{
- extern char __copy_user_begin[], __copy_user_end[];
- extern char __atomic_begin[], __atomic_end[];
- extern char __bzero_begin[], __bzero_end[];
- extern char __bitops_begin[], __bitops_end[];
-
- unsigned long pc = regs->pc;
-
- if (in_lock_functions(pc) ||
- (pc >= (unsigned long) __copy_user_begin &&
- pc < (unsigned long) __copy_user_end) ||
- (pc >= (unsigned long) __atomic_begin &&
- pc < (unsigned long) __atomic_end) ||
- (pc >= (unsigned long) __bzero_begin &&
- pc < (unsigned long) __bzero_end) ||
- (pc >= (unsigned long) __bitops_begin &&
- pc < (unsigned long) __bitops_end))
- pc = regs->u_regs[UREG_RETPC];
- return pc;
-}
-
-__volatile__ unsigned int *master_l10_counter;
-__volatile__ unsigned int *master_l10_limit;
-
-/*
- * timer_interrupt() needs to keep up the real-time clock,
- * as well as call the "do_timer()" routine every clocktick
- */
-
-#define TICK_SIZE (tick_nsec / 1000)
-
-irqreturn_t timer_interrupt(int irq, void *dev_id, struct pt_regs * regs)
-{
- /* last time the cmos clock got updated */
- static long last_rtc_update;
-
-#ifndef CONFIG_SMP
- profile_tick(CPU_PROFILING, regs);
-#endif
-
- /* Protect counter clear so that do_gettimeoffset works */
- write_seqlock(&xtime_lock);
-#ifdef CONFIG_SUN4
- if((idprom->id_machtype == (SM_SUN4 | SM_4_260)) ||
- (idprom->id_machtype == (SM_SUN4 | SM_4_110))) {
- int temp;
- intersil_read_intr(intersil_clock, temp);
- /* re-enable the irq */
- enable_pil_irq(10);
- }
-#endif
- clear_clock_irq();
-
- do_timer(regs);
-#ifndef CONFIG_SMP
- update_process_times(user_mode(regs));
-#endif
-
-
- /* Determine when to update the Mostek clock. */
- 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 (set_rtc_mmss(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);
-
- return IRQ_HANDLED;
-}
-
-/* Kick start a stopped clock (procedure from the Sun NVRAM/hostid FAQ). */
-static void __init kick_start_clock(void)
-{
- struct mostek48t02 *regs = (struct mostek48t02 *)mstk48t02_regs;
- unsigned char sec;
- int i, count;
-
- prom_printf("CLOCK: Clock was stopped. Kick start ");
-
- spin_lock_irq(&mostek_lock);
-
- /* Turn on the kick start bit to start the oscillator. */
- regs->creg |= MSTK_CREG_WRITE;
- regs->sec &= ~MSTK_STOP;
- regs->hour |= MSTK_KICK_START;
- regs->creg &= ~MSTK_CREG_WRITE;
-
- spin_unlock_irq(&mostek_lock);
-
- /* Delay to allow the clock oscillator to start. */
- sec = MSTK_REG_SEC(regs);
- for (i = 0; i < 3; i++) {
- while (sec == MSTK_REG_SEC(regs))
- for (count = 0; count < 100000; count++)
- /* nothing */ ;
- prom_printf(".");
- sec = regs->sec;
- }
- prom_printf("\n");
-
- spin_lock_irq(&mostek_lock);
-
- /* Turn off kick start and set a "valid" time and date. */
- regs->creg |= MSTK_CREG_WRITE;
- regs->hour &= ~MSTK_KICK_START;
- MSTK_SET_REG_SEC(regs,0);
- MSTK_SET_REG_MIN(regs,0);
- MSTK_SET_REG_HOUR(regs,0);
- MSTK_SET_REG_DOW(regs,5);
- MSTK_SET_REG_DOM(regs,1);
- MSTK_SET_REG_MONTH(regs,8);
- MSTK_SET_REG_YEAR(regs,1996 - MSTK_YEAR_ZERO);
- regs->creg &= ~MSTK_CREG_WRITE;
-
- spin_unlock_irq(&mostek_lock);
-
- /* Ensure the kick start bit is off. If it isn't, turn it off. */
- while (regs->hour & MSTK_KICK_START) {
- prom_printf("CLOCK: Kick start still on!\n");
-
- spin_lock_irq(&mostek_lock);
- regs->creg |= MSTK_CREG_WRITE;
- regs->hour &= ~MSTK_KICK_START;
- regs->creg &= ~MSTK_CREG_WRITE;
- spin_unlock_irq(&mostek_lock);
- }
-
- prom_printf("CLOCK: Kick start procedure successful.\n");
-}
-
-/* Return nonzero if the clock chip battery is low. */
-static __inline__ int has_low_battery(void)
-{
- struct mostek48t02 *regs = (struct mostek48t02 *)mstk48t02_regs;
- unsigned char data1, data2;
-
- spin_lock_irq(&mostek_lock);
- data1 = regs->eeprom[0]; /* Read some data. */
- regs->eeprom[0] = ~data1; /* Write back the complement. */
- data2 = regs->eeprom[0]; /* Read back the complement. */
- regs->eeprom[0] = data1; /* Restore the original value. */
- spin_unlock_irq(&mostek_lock);
-
- return (data1 == data2); /* Was the write blocked? */
-}
-
-/* Probe for the real time clock chip on Sun4 */
-static __inline__ void sun4_clock_probe(void)
-{
-#ifdef CONFIG_SUN4
- int temp;
- struct resource r;
-
- memset(&r, 0, sizeof(r));
- if( idprom->id_machtype == (SM_SUN4 | SM_4_330) ) {
- sp_clock_typ = MSTK48T02;
- r.start = sun4_clock_physaddr;
- mstk48t02_regs = sbus_ioremap(&r, 0,
- sizeof(struct mostek48t02), NULL);
- mstk48t08_regs = NULL; /* To catch weirdness */
- intersil_clock = NULL; /* just in case */
-
- /* Kick start the clock if it is completely stopped. */
- if (mostek_read(mstk48t02_regs + MOSTEK_SEC) & MSTK_STOP)
- kick_start_clock();
- } else if( idprom->id_machtype == (SM_SUN4 | SM_4_260)) {
- /* intersil setup code */
- printk("Clock: INTERSIL at %8x ",sun4_clock_physaddr);
- sp_clock_typ = INTERSIL;
- r.start = sun4_clock_physaddr;
- intersil_clock = (struct intersil *)
- sbus_ioremap(&r, 0, sizeof(*intersil_clock), "intersil");
- mstk48t02_regs = 0; /* just be sure */
- mstk48t08_regs = NULL; /* ditto */
- /* initialise the clock */
-
- intersil_intr(intersil_clock,INTERSIL_INT_100HZ);
-
- intersil_start(intersil_clock);
-
- intersil_read_intr(intersil_clock, temp);
- while (!(temp & 0x80))
- intersil_read_intr(intersil_clock, temp);
-
- intersil_read_intr(intersil_clock, temp);
- while (!(temp & 0x80))
- intersil_read_intr(intersil_clock, temp);
-
- intersil_stop(intersil_clock);
-
- }
-#endif
-}
-
-/* Probe for the mostek real time clock chip. */
-static __inline__ void clock_probe(void)
-{
- struct linux_prom_registers clk_reg[2];
- char model[128];
- register int node, cpuunit, bootbus;
- struct resource r;
-
- cpuunit = bootbus = 0;
- memset(&r, 0, sizeof(r));
-
- /* Determine the correct starting PROM node for the probe. */
- node = prom_getchild(prom_root_node);
- switch (sparc_cpu_model) {
- case sun4c:
- break;
- case sun4m:
- node = prom_getchild(prom_searchsiblings(node, "obio"));
- break;
- case sun4d:
- node = prom_getchild(bootbus = prom_searchsiblings(prom_getchild(cpuunit = prom_searchsiblings(node, "cpu-unit")), "bootbus"));
- break;
- default:
- prom_printf("CLOCK: Unsupported architecture!\n");
- prom_halt();
- }
-
- /* Find the PROM node describing the real time clock. */
- sp_clock_typ = MSTK_INVALID;
- node = prom_searchsiblings(node,"eeprom");
- if (!node) {
- prom_printf("CLOCK: No clock found!\n");
- prom_halt();
- }
-
- /* Get the model name and setup everything up. */
- model[0] = '\0';
- prom_getstring(node, "model", model, sizeof(model));
- if (strcmp(model, "mk48t02") == 0) {
- sp_clock_typ = MSTK48T02;
- if (prom_getproperty(node, "reg", (char *) clk_reg, sizeof(clk_reg)) == -1) {
- prom_printf("clock_probe: FAILED!\n");
- prom_halt();
- }
- if (sparc_cpu_model == sun4d)
- prom_apply_generic_ranges (bootbus, cpuunit, clk_reg, 1);
- else
- prom_apply_obio_ranges(clk_reg, 1);
- /* Map the clock register io area read-only */
- r.flags = clk_reg[0].which_io;
- r.start = clk_reg[0].phys_addr;
- mstk48t02_regs = sbus_ioremap(&r, 0,
- sizeof(struct mostek48t02), "mk48t02");
- mstk48t08_regs = NULL; /* To catch weirdness */
- } else if (strcmp(model, "mk48t08") == 0) {
- sp_clock_typ = MSTK48T08;
- if(prom_getproperty(node, "reg", (char *) clk_reg,
- sizeof(clk_reg)) == -1) {
- prom_printf("clock_probe: FAILED!\n");
- prom_halt();
- }
- if (sparc_cpu_model == sun4d)
- prom_apply_generic_ranges (bootbus, cpuunit, clk_reg, 1);
- else
- prom_apply_obio_ranges(clk_reg, 1);
- /* Map the clock register io area read-only */
- /* XXX r/o attribute is somewhere in r.flags */
- r.flags = clk_reg[0].which_io;
- r.start = clk_reg[0].phys_addr;
- mstk48t08_regs = (struct mostek48t08 *) sbus_ioremap(&r, 0,
- sizeof(struct mostek48t08), "mk48t08");
-
- mstk48t02_regs = &mstk48t08_regs->regs;
- } else {
- prom_printf("CLOCK: Unknown model name '%s'\n",model);
- prom_halt();
- }
-
- /* Report a low battery voltage condition. */
- if (has_low_battery())
- printk(KERN_CRIT "NVRAM: Low battery voltage!\n");
-
- /* Kick start the clock if it is completely stopped. */
- if (mostek_read(mstk48t02_regs + MOSTEK_SEC) & MSTK_STOP)
- kick_start_clock();
-}
-
-void __init sbus_time_init(void)
-{
- unsigned int year, mon, day, hour, min, sec;
- struct mostek48t02 *mregs;
-
-#ifdef CONFIG_SUN4
- int temp;
- struct intersil *iregs;
-#endif
-
- BTFIXUPSET_CALL(bus_do_settimeofday, sbus_do_settimeofday, BTFIXUPCALL_NORM);
- btfixup();
-
- if (ARCH_SUN4)
- sun4_clock_probe();
- else
- clock_probe();
-
- sparc_init_timers(timer_interrupt);
-
-#ifdef CONFIG_SUN4
- if(idprom->id_machtype == (SM_SUN4 | SM_4_330)) {
-#endif
- mregs = (struct mostek48t02 *)mstk48t02_regs;
- if(!mregs) {
- prom_printf("Something wrong, clock regs not mapped yet.\n");
- prom_halt();
- }
- spin_lock_irq(&mostek_lock);
- mregs->creg |= MSTK_CREG_READ;
- sec = MSTK_REG_SEC(mregs);
- min = MSTK_REG_MIN(mregs);
- hour = MSTK_REG_HOUR(mregs);
- day = MSTK_REG_DOM(mregs);
- mon = MSTK_REG_MONTH(mregs);
- year = MSTK_CVT_YEAR( MSTK_REG_YEAR(mregs) );
- xtime.tv_sec = mktime(year, mon, day, hour, min, sec);
- xtime.tv_nsec = (INITIAL_JIFFIES % HZ) * (NSEC_PER_SEC / HZ);
- set_normalized_timespec(&wall_to_monotonic,
- -xtime.tv_sec, -xtime.tv_nsec);
- mregs->creg &= ~MSTK_CREG_READ;
- spin_unlock_irq(&mostek_lock);
-#ifdef CONFIG_SUN4
- } else if(idprom->id_machtype == (SM_SUN4 | SM_4_260) ) {
- /* initialise the intersil on sun4 */
-
- iregs=intersil_clock;
- if(!iregs) {
- prom_printf("Something wrong, clock regs not mapped yet.\n");
- prom_halt();
- }
-
- intersil_intr(intersil_clock,INTERSIL_INT_100HZ);
- disable_pil_irq(10);
- intersil_stop(iregs);
- intersil_read_intr(intersil_clock, temp);
-
- temp = iregs->clk.int_csec;
-
- sec = iregs->clk.int_sec;
- min = iregs->clk.int_min;
- hour = iregs->clk.int_hour;
- day = iregs->clk.int_day;
- mon = iregs->clk.int_month;
- year = MSTK_CVT_YEAR(iregs->clk.int_year);
-
- enable_pil_irq(10);
- intersil_start(iregs);
-
- xtime.tv_sec = mktime(year, mon, day, hour, min, sec);
- xtime.tv_nsec = (INITIAL_JIFFIES % HZ) * (NSEC_PER_SEC / HZ);
- set_normalized_timespec(&wall_to_monotonic,
- -xtime.tv_sec, -xtime.tv_nsec);
- printk("%u/%u/%u %u:%u:%u\n",day,mon,year,hour,min,sec);
- }
-#endif
-
- /* Now that OBP ticker has been silenced, it is safe to enable IRQ. */
- local_irq_enable();
-}
-
-void __init time_init(void)
-{
-#ifdef CONFIG_PCI
- extern void pci_time_init(void);
- if (pcic_present()) {
- pci_time_init();
- return;
- }
-#endif
- sbus_time_init();
-}
-
-static inline unsigned long do_gettimeoffset(void)
-{
- return (*master_l10_counter >> 10) & 0x1fffff;
-}
-
-/*
- * Returns nanoseconds
- * XXX This is a suboptimal implementation.
- */
-unsigned long long sched_clock(void)
-{
- return (unsigned long long)jiffies * (1000000000 / HZ);
-}
-
-/* Ok, my cute asm atomicity trick doesn't work anymore.
- * There are just too many variables that need to be protected
- * now (both members of xtime, wall_jiffies, et al.)
- */
-void do_gettimeofday(struct timeval *tv)
-{
- unsigned long flags;
- unsigned long seq;
- unsigned long usec, sec;
- unsigned long max_ntp_tick = tick_usec - tickadj;
-
- do {
- unsigned long lost;
-
- seq = read_seqbegin_irqsave(&xtime_lock, flags);
- usec = do_gettimeoffset();
- lost = jiffies - wall_jiffies;
-
- /*
- * If time_adjust is negative then NTP is slowing the clock
- * so make sure not to go into next possible interval.
- * Better to lose some accuracy than have time go backwards..
- */
- if (unlikely(time_adjust < 0)) {
- usec = min(usec, max_ntp_tick);
-
- if (lost)
- usec += lost * max_ntp_tick;
- }
- else if (unlikely(lost))
- usec += lost * tick_usec;
-
- sec = xtime.tv_sec;
- usec += (xtime.tv_nsec / 1000);
- } while (read_seqretry_irqrestore(&xtime_lock, seq, flags));
-
- while (usec >= 1000000) {
- usec -= 1000000;
- sec++;
- }
-
- tv->tv_sec = sec;
- tv->tv_usec = usec;
-}
-
-EXPORT_SYMBOL(do_gettimeofday);
-
-int do_settimeofday(struct timespec *tv)
-{
- int ret;
-
- write_seqlock_irq(&xtime_lock);
- ret = bus_do_settimeofday(tv);
- write_sequnlock_irq(&xtime_lock);
- clock_was_set();
- return ret;
-}
-
-EXPORT_SYMBOL(do_settimeofday);
-
-static int sbus_do_settimeofday(struct timespec *tv)
-{
- time_t wtm_sec, sec = tv->tv_sec;
- long wtm_nsec, nsec = tv->tv_nsec;
-
- if ((unsigned long)tv->tv_nsec >= NSEC_PER_SEC)
- return -EINVAL;
-
- /*
- * This is revolting. We need to set "xtime" correctly. However, the
- * value in this location is the value at the most recent update of
- * wall time. Discover what correction gettimeofday() would have
- * made, and then undo it!
- */
- nsec -= 1000 * (do_gettimeoffset() +
- (jiffies - wall_jiffies) * (USEC_PER_SEC / HZ));
-
- wtm_sec = wall_to_monotonic.tv_sec + (xtime.tv_sec - sec);
- wtm_nsec = wall_to_monotonic.tv_nsec + (xtime.tv_nsec - nsec);
-
- set_normalized_timespec(&xtime, sec, nsec);
- set_normalized_timespec(&wall_to_monotonic, wtm_sec, wtm_nsec);
-
- ntp_clear();
- return 0;
-}
-
-/*
- * BUG: This routine does not handle hour overflow properly; it just
- * sets the minutes. Usually you won't notice until after reboot!
- */
-static int set_rtc_mmss(unsigned long nowtime)
-{
- int real_seconds, real_minutes, mostek_minutes;
- struct mostek48t02 *regs = (struct mostek48t02 *)mstk48t02_regs;
- unsigned long flags;
-#ifdef CONFIG_SUN4
- struct intersil *iregs = intersil_clock;
- int temp;
-#endif
-
- /* Not having a register set can lead to trouble. */
- if (!regs) {
-#ifdef CONFIG_SUN4
- if(!iregs)
- return -1;
- else {
- temp = iregs->clk.int_csec;
-
- mostek_minutes = iregs->clk.int_min;
-
- real_seconds = nowtime % 60;
- real_minutes = nowtime / 60;
- if (((abs(real_minutes - mostek_minutes) + 15)/30) & 1)
- real_minutes += 30; /* correct for half hour time zone */
- real_minutes %= 60;
-
- if (abs(real_minutes - mostek_minutes) < 30) {
- intersil_stop(iregs);
- iregs->clk.int_sec=real_seconds;
- iregs->clk.int_min=real_minutes;
- intersil_start(iregs);
- } else {
- printk(KERN_WARNING
- "set_rtc_mmss: can't update from %d to %d\n",
- mostek_minutes, real_minutes);
- return -1;
- }
-
- return 0;
- }
-#endif
- }
-
- spin_lock_irqsave(&mostek_lock, flags);
- /* Read the current RTC minutes. */
- regs->creg |= MSTK_CREG_READ;
- mostek_minutes = MSTK_REG_MIN(regs);
- regs->creg &= ~MSTK_CREG_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 - mostek_minutes) + 15)/30) & 1)
- real_minutes += 30; /* correct for half hour time zone */
- real_minutes %= 60;
-
- if (abs(real_minutes - mostek_minutes) < 30) {
- regs->creg |= MSTK_CREG_WRITE;
- MSTK_SET_REG_SEC(regs,real_seconds);
- MSTK_SET_REG_MIN(regs,real_minutes);
- regs->creg &= ~MSTK_CREG_WRITE;
- spin_unlock_irqrestore(&mostek_lock, flags);
- return 0;
- } else {
- spin_unlock_irqrestore(&mostek_lock, flags);
- return -1;
- }
-}
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