diff options
Diffstat (limited to 'include/asm-arm/arch-arc/time.h')
| -rw-r--r-- | include/asm-arm/arch-arc/time.h | 182 |
1 files changed, 8 insertions, 174 deletions
diff --git a/include/asm-arm/arch-arc/time.h b/include/asm-arm/arch-arc/time.h index 5e7f3c863..95c8ae14f 100644 --- a/include/asm-arm/arch-arc/time.h +++ b/include/asm-arm/arch-arc/time.h @@ -1,196 +1,30 @@ /* * linux/include/asm-arm/arch-arc/time.h * - * Copyright (c) 1996 Russell King. + * Copyright (c) 1996-2000 Russell King. * * Changelog: * 24-Sep-1996 RMK Created * 10-Oct-1996 RMK Brought up to date with arch-sa110eval * 04-Dec-1997 RMK Updated for new arch/arm/time.c */ -#include <asm/ioc.h> - -static long last_rtc_update = 0; /* last time the cmos clock got updated */ - -extern __inline__ unsigned long gettimeoffset (void) -{ - unsigned int count1, count2, status1, status2; - unsigned long offset = 0; - - status1 = inb(IOC_IRQREQA); - barrier (); - outb (0, IOC_T0LATCH); - barrier (); - count1 = inb(IOC_T0CNTL) | (inb(IOC_T0CNTH) << 8); - barrier (); - status2 = inb(IOC_IRQREQA); - barrier (); - outb (0, IOC_T0LATCH); - barrier (); - count2 = inb(IOC_T0CNTL) | (inb(IOC_T0CNTH) << 8); - - if (count2 < count1) { - /* - * This means that we haven't just had an interrupt - * while reading into status2. - */ - if (status2 & (1 << 5)) - offset = tick; - count1 = count2; - } else if (count2 > count1) { - /* - * We have just had another interrupt while reading - * status2. - */ - offset += tick; - count1 = count2; - } - - count1 = LATCH - count1; - /* - * count1 = number of clock ticks since last interrupt - */ - offset += count1 * tick / LATCH; - return offset; -} - -extern int iic_control (unsigned char, int, char *, int); - -static int set_rtc_time(unsigned long nowtime) -{ - char buf[5], ctrl; - - if (iic_control(0xa1, 0, &ctrl, 1) != 0) - printk("RTC: failed to read control reg\n"); - - /* - * Reset divider - */ - ctrl |= 0x80; - - if (iic_control(0xa0, 0, &ctrl, 1) != 0) - printk("RTC: failed to stop the clock\n"); - - /* - * We only set the time - we don't set the date. - * This means that there is the possibility once - * a day for the correction to disrupt the date. - * We really ought to write the time and date, or - * nothing at all. - */ - buf[0] = 0; - buf[1] = nowtime % 60; nowtime /= 60; - buf[2] = nowtime % 60; nowtime /= 60; - buf[3] = nowtime % 24; - - BIN_TO_BCD(buf[1]); - BIN_TO_BCD(buf[2]); - BIN_TO_BCD(buf[3]); - - if (iic_control(0xa0, 1, buf, 4) != 0) - printk("RTC: Failed to set the time\n"); - - /* - * Re-enable divider - */ - ctrl &= ~0x80; - - if (iic_control(0xa0, 0, &ctrl, 1) != 0) - printk("RTC: failed to start the clock\n"); - - return 0; -} - -extern __inline__ unsigned long get_rtc_time(void) -{ - unsigned int year, i; - char buf[8]; - - /* - * The year is not part of the RTC counter - * registers, and is stored in RAM. This - * means that it will not be automatically - * updated. - */ - if (iic_control(0xa1, 0xc0, buf, 1) != 0) - printk("RTC: failed to read the year\n"); - - /* - * If the year is before 1970, then the year - * is actually 100 in advance. This gives us - * a year 2070 bug... - */ - year = 1900 + buf[0]; - if (year < 1970) - year += 100; - - /* - * Read the time and date in one go - this - * will ensure that we don't get any effects - * due to carry (the RTC latches the counters - * during a read). - */ - if (iic_control(0xa1, 2, buf, 5) != 0) { - printk("RTC: failed to read the time and date\n"); - memset(buf, 0, sizeof(buf)); - } - - /* - * The RTC combines years with date and weekday - * with month. We need to mask off this extra - * information before converting the date to - * binary. - */ - buf[4] &= 0x1f; - buf[3] &= 0x3f; - - for (i = 0; i < 5; i++) - BCD_TO_BIN(buf[i]); - - return mktime(year, buf[4], buf[3], buf[2], buf[1], buf[0]); -} +extern void ioctime_init(void); static void timer_interrupt(int irq, void *dev_id, struct pt_regs *regs) { do_timer(regs); - - /* If we have an externally synchronized linux clock, then update - * CMOS clock accordingly every ~11 minutes. Set_rtc_mmss() has to be - * called as close as possible to 500 ms before the new second starts. - */ - if ((time_status & STA_UNSYNC) == 0 && - xtime.tv_sec > last_rtc_update + 660 && - xtime.tv_usec >= 50000 - (tick >> 1) && - xtime.tv_usec < 50000 + (tick >> 1)) { - if (set_rtc_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 */ - } - - if (!user_mode(regs)) - do_profile(instruction_pointer(regs)); + do_set_rtc(); + do_profile(regs); } -static struct irqaction timerirq = { - timer_interrupt, - 0, - 0, - "timer", - NULL, - NULL -}; - /* - * Set up timer interrupt, and return the current time in seconds. + * Set up timer interrupt. */ extern __inline__ void setup_timer(void) { - outb(LATCH & 255, IOC_T0LTCHL); - outb(LATCH >> 8, IOC_T0LTCHH); - outb(0, IOC_T0GO); + ioctime_init(); - xtime.tv_sec = get_rtc_time(); + timer_irq.handler = timer_interrupt; - setup_arm_irq(IRQ_TIMER, &timerirq); + setup_arm_irq(IRQ_TIMER, &timer_irq); } |