patch-2.4.20 linux-2.4.20/arch/ppc/kernel/prep_time.c
Next file: linux-2.4.20/arch/ppc/kernel/proc_rtas.c
Previous file: linux-2.4.20/arch/ppc/kernel/prep_setup.c
Back to the patch index
Back to the overall index
- Lines: 229
- Date:
Wed Dec 31 16:00:00 1969
- Orig file:
linux-2.4.19/arch/ppc/kernel/prep_time.c
- Orig date:
Sat Sep 8 12:38:42 2001
diff -urN linux-2.4.19/arch/ppc/kernel/prep_time.c linux-2.4.20/arch/ppc/kernel/prep_time.c
@@ -1,228 +0,0 @@
-/*
- * BK Id: SCCS/s.prep_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/init.h>
-
-#include <asm/sections.h>
-#include <asm/segment.h>
-#include <asm/io.h>
-#include <asm/processor.h>
-#include <asm/machdep.h>
-#include <asm/prep_nvram.h>
-#include <asm/mk48t59.h>
-
-#include <asm/time.h>
-
-extern spinlock_t rtc_lock;
-
-/*
- * The motorola uses the m48t18 rtc (includes DS1643) whose registers
- * are at a higher end of nvram (1ff8-1fff) than the ibm mc146818
- * rtc (ds1386) which has regs at addr 0-d). The intel gets
- * past this because the bios emulates the mc146818.
- *
- * Why in the world did they have to use different clocks?
- *
- * Right now things are hacked to check which machine we're on then
- * use the appropriate macro. This is very very ugly and I should
- * probably have a function that checks which machine we're on then
- * does things correctly transparently or a function pointer which
- * is setup at boot time to use the correct addresses.
- * -- Cort
- */
-
-/*
- * Set the hardware clock. -- Cort
- */
-__prep
-int mc146818_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);
-
- /* tell the clock it's being set */
- save_control = CMOS_READ(RTC_CONTROL);
-
- CMOS_WRITE((save_control|RTC_SET), RTC_CONTROL);
-
- /* stop and reset prescaler */
- save_freq_select = CMOS_READ(RTC_FREQ_SELECT);
-
- CMOS_WRITE((save_freq_select|RTC_DIV_RESET2), RTC_FREQ_SELECT);
-
- tm.tm_year = (tm.tm_year - 1900) % 100;
- 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);
- }
- CMOS_WRITE(tm.tm_sec, RTC_SECONDS);
- CMOS_WRITE(tm.tm_min, RTC_MINUTES);
- CMOS_WRITE(tm.tm_hour, RTC_HOURS);
- CMOS_WRITE(tm.tm_mon, RTC_MONTH);
- CMOS_WRITE(tm.tm_mday, RTC_DAY_OF_MONTH);
- CMOS_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
- */
- CMOS_WRITE(save_control, RTC_CONTROL);
- CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT);
- spin_unlock(&rtc_lock);
-
- return 0;
-}
-
-__prep
-unsigned long mc146818_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 = CMOS_READ(RTC_FREQ_SELECT);
- 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);
- uip |= CMOS_READ(RTC_FREQ_SELECT);
- if ((uip & RTC_UIP)==0) break;
- }
-
- if (!(CMOS_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);
-}
-
-__prep
-int mk48t59_set_rtc_time(unsigned long nowtime)
-{
- unsigned char save_control;
- struct rtc_time tm;
-
- spin_lock(&rtc_lock);
- to_tm(nowtime, &tm);
-
- /* tell the clock it's being written */
- save_control = ppc_md.nvram_read_val(MK48T59_RTC_CONTROLA);
-
- ppc_md.nvram_write_val(MK48T59_RTC_CONTROLA,
- (save_control | MK48T59_RTC_CA_WRITE));
-
- tm.tm_year = (tm.tm_year - 1900) % 100;
- 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);
-
- ppc_md.nvram_write_val(MK48T59_RTC_SECONDS, tm.tm_sec);
- ppc_md.nvram_write_val(MK48T59_RTC_MINUTES, tm.tm_min);
- ppc_md.nvram_write_val(MK48T59_RTC_HOURS, tm.tm_hour);
- ppc_md.nvram_write_val(MK48T59_RTC_MONTH, tm.tm_mon);
- ppc_md.nvram_write_val(MK48T59_RTC_DAY_OF_MONTH, tm.tm_mday);
- ppc_md.nvram_write_val(MK48T59_RTC_YEAR, tm.tm_year);
-
- /* Turn off the write bit. */
- ppc_md.nvram_write_val(MK48T59_RTC_CONTROLA, save_control);
- spin_unlock(&rtc_lock);
-
- return 0;
-}
-
-__prep
-unsigned long mk48t59_get_rtc_time(void)
-{
- unsigned char save_control;
- unsigned int year, mon, day, hour, min, sec;
-
- /* Simple: freeze the clock, read it and allow updates again */
- save_control = ppc_md.nvram_read_val(MK48T59_RTC_CONTROLA);
- save_control &= ~MK48T59_RTC_CA_READ;
- ppc_md.nvram_write_val(MK48T59_RTC_CONTROLA, save_control);
-
- /* Set the register to read the value. */
- ppc_md.nvram_write_val(MK48T59_RTC_CONTROLA,
- (save_control | MK48T59_RTC_CA_READ));
-
- sec = ppc_md.nvram_read_val(MK48T59_RTC_SECONDS);
- min = ppc_md.nvram_read_val(MK48T59_RTC_MINUTES);
- hour = ppc_md.nvram_read_val(MK48T59_RTC_HOURS);
- day = ppc_md.nvram_read_val(MK48T59_RTC_DAY_OF_MONTH);
- mon = ppc_md.nvram_read_val(MK48T59_RTC_MONTH);
- year = ppc_md.nvram_read_val(MK48T59_RTC_YEAR);
-
- /* Let the time values change again. */
- ppc_md.nvram_write_val(MK48T59_RTC_CONTROLA, save_control);
-
- BCD_TO_BIN(sec);
- BCD_TO_BIN(min);
- BCD_TO_BIN(hour);
- BCD_TO_BIN(day);
- BCD_TO_BIN(mon);
- BCD_TO_BIN(year);
-
- year = year + 1900;
- if (year < 1970) {
- year += 100;
- }
-
- return mktime(year, mon, day, hour, min, sec);
-}
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)