Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 200 insertions, 0 deletions

diff --git a/arch/mips/dec/time.c b/arch/mips/dec/time.c
new file mode 100644
index 000000000000..dc7091caa7aa
--- /dev/null
+++ b/arch/mips/dec/time.c
@@ -0,0 +1,200 @@
+/*
+ *  linux/arch/mips/dec/time.c
+ *
+ *  Copyright (C) 1991, 1992, 1995  Linus Torvalds
+ *  Copyright (C) 2000, 2003  Maciej W. Rozycki
+ *
+ * This file contains the time handling details for PC-style clocks as
+ * found in some MIPS systems.
+ *
+ */
+#include <linux/bcd.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/mc146818rtc.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/param.h>
+#include <linux/sched.h>
+#include <linux/string.h>
+#include <linux/time.h>
+#include <linux/types.h>
+
+#include <asm/bootinfo.h>
+#include <asm/cpu.h>
+#include <asm/div64.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/mipsregs.h>
+#include <asm/sections.h>
+#include <asm/time.h>
+
+#include <asm/dec/interrupts.h>
+#include <asm/dec/ioasic.h>
+#include <asm/dec/ioasic_addrs.h>
+#include <asm/dec/machtype.h>
+
+
+static unsigned long dec_rtc_get_time(void)
+{
+	unsigned int year, mon, day, hour, min, sec, real_year;
+	int i;
+
+	/* The Linux interpretation of the DS1287 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 (CMOS_READ(RTC_FREQ_SELECT) & RTC_UIP)
+			break;
+	for (i = 0; i < 1000000; i++)	/* must try at least 2.228 ms */
+		if (!(CMOS_READ(RTC_FREQ_SELECT) & RTC_UIP))
+			break;
+	/* Isn't this overkill?  UIP above should guarantee consistency */
+	do {
+		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);
+	} while (sec != CMOS_READ(RTC_SECONDS));
+	if (!(CMOS_READ(RTC_CONTROL) & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
+		sec = BCD2BIN(sec);
+		min = BCD2BIN(min);
+		hour = BCD2BIN(hour);
+		day = BCD2BIN(day);
+		mon = BCD2BIN(mon);
+		year = BCD2BIN(year);
+	}
+	/*
+	 * The PROM will reset the year to either '72 or '73.
+	 * Therefore we store the real year separately, in one
+	 * of unused BBU RAM locations.
+	 */
+	real_year = CMOS_READ(RTC_DEC_YEAR);
+	year += real_year - 72 + 2000;
+
+	return mktime(year, mon, day, hour, min, sec);
+}
+
+/*
+ * In order to set the CMOS clock precisely, dec_rtc_set_mmss has to
+ * be called 500 ms after the second nowtime has started, because when
+ * nowtime is written into the registers of the CMOS clock, it will
+ * jump to the next second precisely 500 ms later.  Check the Dallas
+ * DS1287 data sheet for details.
+ */
+static int dec_rtc_set_mmss(unsigned long nowtime)
+{
+	int retval = 0;
+	int real_seconds, real_minutes, cmos_minutes;
+	unsigned char save_control, save_freq_select;
+
+	/* 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);
+
+	cmos_minutes = CMOS_READ(RTC_MINUTES);
+	if (!(save_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
+		cmos_minutes = BCD2BIN(cmos_minutes);
+
+	/*
+	 * since we're only adjusting minutes and seconds,
+	 * don't interfere with hour overflow. This avoids
+	 * messing with unknown time zones but requires your
+	 * RTC not to be off by more than 15 minutes
+	 */
+	real_seconds = nowtime % 60;
+	real_minutes = nowtime / 60;
+	if (((abs(real_minutes - cmos_minutes) + 15) / 30) & 1)
+		real_minutes += 30;	/* correct for half hour time zone */
+	real_minutes %= 60;
+
+	if (abs(real_minutes - cmos_minutes) < 30) {
+		if (!(save_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
+			real_seconds = BIN2BCD(real_seconds);
+			real_minutes = BIN2BCD(real_minutes);
+		}
+		CMOS_WRITE(real_seconds, RTC_SECONDS);
+		CMOS_WRITE(real_minutes, RTC_MINUTES);
+	} else {
+		printk(KERN_WARNING
+		       "set_rtc_mmss: can't update from %d to %d\n",
+		       cmos_minutes, real_minutes);
+		retval = -1;
+	}
+
+	/* The following flags have to be released exactly in this order,
+	 * otherwise the DS1287 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);
+
+	return retval;
+}
+
+
+static int dec_timer_state(void)
+{
+	return (CMOS_READ(RTC_REG_C) & RTC_PF) != 0;
+}
+
+static void dec_timer_ack(void)
+{
+	CMOS_READ(RTC_REG_C);			/* Ack the RTC interrupt.  */
+}
+
+static unsigned int dec_ioasic_hpt_read(void)
+{
+	/*
+	 * The free-running counter is 32-bit which is good for about
+	 * 2 minutes, 50 seconds at possible count rates of up to 25MHz.
+	 */
+	return ioasic_read(IO_REG_FCTR);
+}
+
+static void dec_ioasic_hpt_init(unsigned int count)
+{
+	ioasic_write(IO_REG_FCTR, ioasic_read(IO_REG_FCTR) - count);
+}
+
+
+void __init dec_time_init(void)
+{
+	rtc_get_time = dec_rtc_get_time;
+	rtc_set_mmss = dec_rtc_set_mmss;
+
+	mips_timer_state = dec_timer_state;
+	mips_timer_ack = dec_timer_ack;
+
+	if (!cpu_has_counter && IOASIC) {
+		/* For pre-R4k systems we use the I/O ASIC's counter.  */
+		mips_hpt_read = dec_ioasic_hpt_read;
+		mips_hpt_init = dec_ioasic_hpt_init;
+	}
+
+	/* Set up the rate of periodic DS1287 interrupts.  */
+	CMOS_WRITE(RTC_REF_CLCK_32KHZ | (16 - LOG_2_HZ), RTC_REG_A);
+}
+
+EXPORT_SYMBOL(do_settimeofday);
+
+void __init dec_timer_setup(struct irqaction *irq)
+{
+	setup_irq(dec_interrupt[DEC_IRQ_RTC], irq);
+
+	/* Enable periodic DS1287 interrupts.  */
+	CMOS_WRITE(CMOS_READ(RTC_REG_B) | RTC_PIE, RTC_REG_B);
+}