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/*
* linux/arch/i386/kernel/time.c
*
* Copyright (C) 1991, 1992, 1995 Linus Torvalds
*
* Adapted for PowerPC (PreP) by Gary Thomas
* Modified by Cort Dougan (cort@cs.nmt.edu)
* copied and modified from intel version
*
*/
#include <linux/errno.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/timex.h>
#include <linux/kernel_stat.h>
#include <linux/mc146818rtc.h>
#include <linux/init.h>
#include <asm/segment.h>
#include <asm/io.h>
#include <asm/processor.h>
#include <asm/nvram.h>
#include <asm/prom.h>
#include "time.h"
static int nvram_as1 = NVRAM_AS1;
static int nvram_as0 = NVRAM_AS0;
static int nvram_data = NVRAM_DATA;
void __init chrp_time_init(void)
{
struct device_node *rtcs;
int base;
rtcs = find_compatible_devices("rtc", "pnpPNP,b00");
if (rtcs == NULL || rtcs->addrs == NULL)
return;
base = rtcs->addrs[0].address;
nvram_as1 = 0;
nvram_as0 = base;
nvram_data = base + 1;
}
int chrp_cmos_clock_read(int addr)
{
if (nvram_as1 != 0)
outb(addr>>8, nvram_as1);
outb(addr, nvram_as0);
return (inb(nvram_data));
}
void chrp_cmos_clock_write(unsigned long val, int addr)
{
if (nvram_as1 != 0)
outb(addr>>8, nvram_as1);
outb(addr, nvram_as0);
outb(val, nvram_data);
return;
}
/*
* Set the hardware clock. -- Cort
*/
int chrp_set_rtc_time(unsigned long nowtime)
{
unsigned char save_control, save_freq_select;
struct rtc_time tm;
to_tm(nowtime, &tm);
save_control = chrp_cmos_clock_read(RTC_CONTROL); /* tell the clock it's being set */
chrp_cmos_clock_write((save_control|RTC_SET), RTC_CONTROL);
save_freq_select = chrp_cmos_clock_read(RTC_FREQ_SELECT); /* stop and reset prescaler */
chrp_cmos_clock_write((save_freq_select|RTC_DIV_RESET2), RTC_FREQ_SELECT);
tm.tm_year -= 1900;
if (!(save_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
BIN_TO_BCD(tm.tm_sec);
BIN_TO_BCD(tm.tm_min);
BIN_TO_BCD(tm.tm_hour);
BIN_TO_BCD(tm.tm_mon);
BIN_TO_BCD(tm.tm_mday);
BIN_TO_BCD(tm.tm_year);
}
chrp_cmos_clock_write(tm.tm_sec,RTC_SECONDS);
chrp_cmos_clock_write(tm.tm_min,RTC_MINUTES);
chrp_cmos_clock_write(tm.tm_hour,RTC_HOURS);
chrp_cmos_clock_write(tm.tm_mon,RTC_MONTH);
chrp_cmos_clock_write(tm.tm_mday,RTC_DAY_OF_MONTH);
chrp_cmos_clock_write(tm.tm_year,RTC_YEAR);
/* 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
*/
chrp_cmos_clock_write(save_control, RTC_CONTROL);
chrp_cmos_clock_write(save_freq_select, RTC_FREQ_SELECT);
if ( (time_state == TIME_ERROR) || (time_state == TIME_BAD) )
time_state = TIME_OK;
return 0;
}
unsigned long chrp_get_rtc_time(void)
{
unsigned int year, mon, day, hour, min, sec;
int i;
/* The Linux interpretation of the CMOS clock register contents:
* When the Update-In-Progress (UIP) flag goes from 1 to 0, the
* RTC registers show the second which has precisely just started.
* Let's hope other operating systems interpret the RTC the same way.
*/
/* read RTC exactly on falling edge of update flag */
for (i = 0 ; i < 1000000 ; i++) /* may take up to 1 second... */
if (chrp_cmos_clock_read(RTC_FREQ_SELECT) & RTC_UIP)
break;
for (i = 0 ; i < 1000000 ; i++) /* must try at least 2.228 ms */
if (!(chrp_cmos_clock_read(RTC_FREQ_SELECT) & RTC_UIP))
break;
do { /* Isn't this overkill ? UIP above should guarantee consistency */
sec = chrp_cmos_clock_read(RTC_SECONDS);
min = chrp_cmos_clock_read(RTC_MINUTES);
hour = chrp_cmos_clock_read(RTC_HOURS);
day = chrp_cmos_clock_read(RTC_DAY_OF_MONTH);
mon = chrp_cmos_clock_read(RTC_MONTH);
year = chrp_cmos_clock_read(RTC_YEAR);
} while (sec != chrp_cmos_clock_read(RTC_SECONDS));
if (!(chrp_cmos_clock_read(RTC_CONTROL) & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
{
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 ((year += 1900) < 1970)
year += 100;
return mktime(year, mon, day, hour, min, sec);
}
void __init chrp_calibrate_decr(void)
{
struct device_node *cpu;
int *fp, divisor;
unsigned long freq;
if (via_calibrate_decr())
return;
/*
* The cpu node should have a timebase-frequency property
* to tell us the rate at which the decrementer counts.
*/
freq = 16666000; /* hardcoded default */
cpu = find_type_devices("cpu");
if (cpu != 0) {
fp = (int *) get_property(cpu, "timebase-frequency", NULL);
if (fp != 0)
freq = *fp;
}
freq *= 60; /* try to make freq/1e6 an integer */
divisor = 60;
printk("time_init: decrementer frequency = %lu/%d\n", freq, divisor);
decrementer_count = freq / HZ / divisor;
count_period_num = divisor;
count_period_den = freq / 1000000;
}
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