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authorThomas Gleixner <tglx@linutronix.de>2008-01-30 13:30:27 +0100
committerIngo Molnar <mingo@elte.hu>2008-01-30 13:30:27 +0100
commit1122b134bcd6e77c5a4117952b8cbc55c8d018bc (patch)
treee4b0df9c7fb4686357a33c00d037898725ab5b82 /arch/x86/kernel/time_64.c
parentfe599f9fbc5d470ec5b55d08f2bbb991ddecbbc8 (diff)
x86: share rtc code
Remove the rtc code from time_64.c and add the extra bits to the i386 path. The ACPI century check is probably valid for i386 as well, but this is material for a separate patch. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/time_64.c')
-rw-r--r--arch/x86/kernel/time_64.c157
1 files changed, 0 insertions, 157 deletions
diff --git a/arch/x86/kernel/time_64.c b/arch/x86/kernel/time_64.c
index 0a01504586a..64cd03ed9bf 100644
--- a/arch/x86/kernel/time_64.c
+++ b/arch/x86/kernel/time_64.c
@@ -46,9 +46,6 @@
#include <asm/nmi.h>
#include <asm/vgtod.h>
-DEFINE_SPINLOCK(rtc_lock);
-EXPORT_SYMBOL(rtc_lock);
-
volatile unsigned long __jiffies __section_jiffies = INITIAL_JIFFIES;
unsigned long profile_pc(struct pt_regs *regs)
@@ -69,103 +66,6 @@ unsigned long profile_pc(struct pt_regs *regs)
}
EXPORT_SYMBOL(profile_pc);
-/* Routines for accessing the CMOS RAM/RTC. */
-unsigned char rtc_cmos_read(unsigned char addr)
-{
- unsigned char val;
- lock_cmos_prefix(addr);
- outb_p(addr, RTC_PORT(0));
- val = inb_p(RTC_PORT(1));
- lock_cmos_suffix(addr);
- return val;
-}
-EXPORT_SYMBOL(rtc_cmos_read);
-
-void rtc_cmos_write(unsigned char val, unsigned char addr)
-{
- lock_cmos_prefix(addr);
- outb_p(addr, RTC_PORT(0));
- outb_p(val, RTC_PORT(1));
- lock_cmos_suffix(addr);
-}
-EXPORT_SYMBOL(rtc_cmos_write);
-
-/*
- * In order to set the CMOS clock precisely, set_rtc_mmss has to be called 500
- * ms after the second nowtime has started, because when nowtime is written
- * into the registers of the CMOS clock, it will jump to the next second
- * precisely 500 ms later. Check the Motorola MC146818A or Dallas DS12887 data
- * sheet for details.
- */
-
-static int set_rtc_mmss(unsigned long nowtime)
-{
- int retval = 0;
- int real_seconds, real_minutes, cmos_minutes;
- unsigned char control, freq_select;
- unsigned long flags;
-
-/*
- * set_rtc_mmss is called when irqs are enabled, so disable irqs here
- */
- spin_lock_irqsave(&rtc_lock, flags);
-/*
- * Tell the clock it's being set and stop it.
- */
- control = CMOS_READ(RTC_CONTROL);
- CMOS_WRITE(control | RTC_SET, RTC_CONTROL);
-
- freq_select = CMOS_READ(RTC_FREQ_SELECT);
- CMOS_WRITE(freq_select | RTC_DIV_RESET2, RTC_FREQ_SELECT);
-
- cmos_minutes = CMOS_READ(RTC_MINUTES);
- BCD_TO_BIN(cmos_minutes);
-
-/*
- * 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. Since we're calling it only when
- * our clock is externally synchronized using NTP, this shouldn't be a problem.
- */
-
- 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) {
- printk(KERN_WARNING "time.c: can't update CMOS clock "
- "from %d to %d\n", cmos_minutes, real_minutes);
- retval = -1;
- } else {
- BIN_TO_BCD(real_seconds);
- BIN_TO_BCD(real_minutes);
- CMOS_WRITE(real_seconds, RTC_SECONDS);
- CMOS_WRITE(real_minutes, RTC_MINUTES);
- }
-
-/*
- * The following flags have to be released exactly in this order, otherwise the
- * DS12887 (popular MC146818A clone with integrated battery and quartz) will
- * not reset the oscillator and will not update precisely 500 ms later. You
- * won't find this mentioned in the Dallas Semiconductor data sheets, but who
- * believes data sheets anyway ... -- Markus Kuhn
- */
-
- CMOS_WRITE(control, RTC_CONTROL);
- CMOS_WRITE(freq_select, RTC_FREQ_SELECT);
-
- spin_unlock_irqrestore(&rtc_lock, flags);
-
- return retval;
-}
-
-int update_persistent_clock(struct timespec now)
-{
- return set_rtc_mmss(now.tv_sec);
-}
-
static irqreturn_t timer_event_interrupt(int irq, void *dev_id)
{
add_pda(irq0_irqs, 1);
@@ -175,63 +75,6 @@ static irqreturn_t timer_event_interrupt(int irq, void *dev_id)
return IRQ_HANDLED;
}
-unsigned long read_persistent_clock(void)
-{
- unsigned int year, mon, day, hour, min, sec;
- unsigned long flags;
- unsigned century = 0;
-
- spin_lock_irqsave(&rtc_lock, flags);
- /*
- * if UIP is clear, then we have >= 244 microseconds before RTC
- * registers will be updated. Spec sheet says that this is the
- * reliable way to read RTC - registers invalid (off bus) during update
- */
- while ((CMOS_READ(RTC_FREQ_SELECT) & RTC_UIP))
- cpu_relax();
-
-
- /* now read all RTC registers while stable with interrupts disabled */
- sec = CMOS_READ(RTC_SECONDS);
- min = CMOS_READ(RTC_MINUTES);
- hour = CMOS_READ(RTC_HOURS);
- day = CMOS_READ(RTC_DAY_OF_MONTH);
- mon = CMOS_READ(RTC_MONTH);
- year = CMOS_READ(RTC_YEAR);
-#ifdef CONFIG_ACPI
- if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID &&
- acpi_gbl_FADT.century)
- century = CMOS_READ(acpi_gbl_FADT.century);
-#endif
- spin_unlock_irqrestore(&rtc_lock, flags);
-
- /*
- * We know that x86-64 always uses BCD format, no need to check the
- * config register.
- */
-
- BCD_TO_BIN(sec);
- BCD_TO_BIN(min);
- BCD_TO_BIN(hour);
- BCD_TO_BIN(day);
- BCD_TO_BIN(mon);
- BCD_TO_BIN(year);
-
- if (century) {
- BCD_TO_BIN(century);
- year += century * 100;
- printk(KERN_INFO "Extended CMOS year: %d\n", century * 100);
- } else {
- /*
- * x86-64 systems only exists since 2002.
- * This will work up to Dec 31, 2100
- */
- year += 2000;
- }
-
- return mktime(year, mon, day, hour, min, sec);
-}
-
/* calibrate_cpu is used on systems with fixed rate TSCs to determine
* processor frequency */
#define TICK_COUNT 100000000