patch-2.4.20 linux-2.4.20/arch/ppc/kernel/chrp_time.c
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- Lines: 196
- Date:
Wed Dec 31 16:00:00 1969
- Orig file:
linux-2.4.19/arch/ppc/kernel/chrp_time.c
- Orig date:
Sat Sep 8 12:38:41 2001
diff -urN linux-2.4.19/arch/ppc/kernel/chrp_time.c linux-2.4.20/arch/ppc/kernel/chrp_time.c
@@ -1,195 +0,0 @@
-/*
- * BK Id: SCCS/s.chrp_time.c 1.10 09/08/01 15:47:42 paulus
- */
-/*
- * 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/time.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 <asm/sections.h>
-#include <asm/time.h>
-
-extern spinlock_t rtc_lock;
-
-static int nvram_as1 = NVRAM_AS1;
-static int nvram_as0 = NVRAM_AS0;
-static int nvram_data = NVRAM_DATA;
-
-long __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 0;
- base = rtcs->addrs[0].address;
- nvram_as1 = 0;
- nvram_as0 = base;
- nvram_data = base + 1;
-
- return 0;
-}
-
-int __chrp 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 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 chrp_set_rtc_time(unsigned long nowtime)
-{
- unsigned char save_control, save_freq_select;
- struct rtc_time tm;
-
- spin_lock(&rtc_lock);
- 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;
- spin_unlock(&rtc_lock);
- return 0;
-}
-
-unsigned long __chrp chrp_get_rtc_time(void)
-{
- unsigned int year, mon, day, hour, min, sec;
- int uip, 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.
- */
-
- /* Since the UIP flag is set for about 2.2 ms and the clock
- * is typically written with a precision of 1 jiffy, trying
- * to obtain a precision better than a few milliseconds is
- * an illusion. Only consistency is interesting, this also
- * allows to use the routine for /dev/rtc without a potential
- * 1 second kernel busy loop triggered by any reader of /dev/rtc.
- */
-
- for ( i = 0; i<1000000; i++) {
- uip = chrp_cmos_clock_read(RTC_FREQ_SELECT);
- 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);
- uip |= chrp_cmos_clock_read(RTC_FREQ_SELECT);
- if ((uip & RTC_UIP)==0) break;
- }
-
- 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;
- unsigned int freq, *fp;
-
- 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 = (unsigned int *)
- get_property(cpu, "timebase-frequency", NULL);
- if (fp != 0)
- freq = *fp;
- }
- printk("time_init: decrementer frequency = %u.%.6u MHz\n",
- freq/1000000, freq%1000000);
- tb_ticks_per_jiffy = freq / HZ;
- tb_to_us = mulhwu_scale_factor(freq, 1000000);
-}
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