This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / arch / powerpc / platforms / chrp / time.c

diff --git a/arch/powerpc/platforms/chrp/time.c b/arch/powerpc/platforms/chrp/time.c
new file mode 100644 (file)
index 0000000..7d78890
--- /dev/null
+++ b/arch/powerpc/platforms/chrp/time.c
@@ -0,0 +1,149 @@
+/*
+ *  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 arch/i386/kernel/time.c
+ *
+ */
+#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 <linux/bcd.h>
+#include <linux/ioport.h>
+
+#include <asm/io.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;
+       struct resource r;
+       int base;
+
+       rtcs = find_compatible_devices("rtc", "pnpPNP,b00");
+       if (rtcs == NULL)
+               rtcs = find_compatible_devices("rtc", "ds1385-rtc");
+       if (rtcs == NULL || of_address_to_resource(rtcs, 0, &r))
+               return 0;
+       
+       base = r.start;
+       nvram_as1 = 0;
+       nvram_as0 = base;
+       nvram_data = base + 1;
+
+       return 0;
+}
+
+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(struct rtc_time *tmarg)
+{
+       unsigned char save_control, save_freq_select;
+       struct rtc_time tm = *tmarg;
+
+       spin_lock(&rtc_lock);
+
+       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);
+
+       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);
+
+       spin_unlock(&rtc_lock);
+       return 0;
+}
+
+void chrp_get_rtc_time(struct rtc_time *tm)
+{
+       unsigned int year, mon, day, hour, min, sec;
+
+       do {
+               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 < 70)
+               year += 100;
+       tm->tm_sec = sec;
+       tm->tm_min = min;
+       tm->tm_hour = hour;
+       tm->tm_mday = day;
+       tm->tm_mon = mon;
+       tm->tm_year = year;
+}