[PATCH 24/56] microblaze_v2: time support

[monstr]

From: Michal Simek <monstr@xxxxxxxxx>


Signed-off-by: Michal Simek <monstr@xxxxxxxxx>
---
 arch/microblaze/kernel/time.c  |   90 ++++++++++++++++++++++++++++++++++++++++
 include/asm-microblaze/delay.h |   33 +++++++++++++++
 include/asm-microblaze/timex.h |   20 +++++++++
 3 files changed, 143 insertions(+), 0 deletions(-)
 create mode 100644 arch/microblaze/kernel/time.c
 create mode 100644 include/asm-microblaze/delay.h
 create mode 100644 include/asm-microblaze/timex.h

diff --git a/arch/microblaze/kernel/time.c b/arch/microblaze/kernel/time.c
new file mode 100644
index 0000000..d5ebdff
--- /dev/null
+++ b/arch/microblaze/kernel/time.c
@@ -0,0 +1,90 @@
+/*
+ * arch/microblaze/kernel/time.c
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2006 Atmark Techno, Inc.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/param.h>
+#include <linux/jiffies.h>
+#include <linux/time.h>
+#include <linux/hrtimer.h>
+#include <asm/bug.h>
+#include <asm/setup.h>
+
+void time_init(void)
+{
+	system_timer_init();
+}
+
+int do_settimeofday(struct timespec *tv)
+{
+	if ((unsigned long)tv->tv_nsec >= NSEC_PER_SEC)
+		return -EINVAL;
+
+	write_seqlock_irq(&xtime_lock);
+
+	/* This is revolting. We need to set the xtime.tv_nsec
+	 * correctly. However, the value in this location is
+	 * is value at the last tick.
+	 * Discover what correction gettimeofday
+	 * would have done, and then undo it!
+	 */
+#if 0
+	tv->tv_nsec -= mach_gettimeoffset() * 1000;
+#endif
+
+	while (tv->tv_nsec < 0) {
+		tv->tv_nsec += NSEC_PER_SEC;
+		tv->tv_sec--;
+	}
+
+	xtime.tv_sec = tv->tv_sec;
+	xtime.tv_nsec = tv->tv_nsec;
+
+	time_adjust = 0;
+	time_status |= STA_UNSYNC;
+	time_maxerror = NTP_PHASE_LIMIT;
+	time_esterror = NTP_PHASE_LIMIT;
+
+	write_sequnlock_irq(&xtime_lock);
+	clock_was_set();
+	return 0;
+}
+EXPORT_SYMBOL(do_settimeofday);
+
+/*
+ * This version of gettimeofday has near microsecond resolution.
+ */
+void do_gettimeofday(struct timeval *tv)
+{
+	unsigned long seq;
+	unsigned long usec, sec;
+	/* unsigned long max_ntp_tick = tick_usec - tickadj; */
+
+	do {
+		seq = read_seqbegin(&xtime_lock);
+		usec = do_gettimeoffset();
+		sec = xtime.tv_sec;
+		usec += (xtime.tv_nsec / 1000);
+	} while (read_seqretry(&xtime_lock, seq));
+
+	while (usec >= 1000000) {
+		usec -= 1000000;
+		sec++;
+	}
+
+	tv->tv_sec = sec;
+	tv->tv_usec = usec;
+}
+EXPORT_SYMBOL(do_gettimeofday);
+
+unsigned long long sched_clock(void)
+{
+	return (unsigned long long)jiffies * (1000000000 / HZ);
+}
diff --git a/include/asm-microblaze/delay.h b/include/asm-microblaze/delay.h
new file mode 100644
index 0000000..481359c
--- /dev/null
+++ b/include/asm-microblaze/delay.h
@@ -0,0 +1,33 @@
+/*
+ * include/asm-microblaze/delay.h
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2006 Atmark Techno, Inc.
+ */
+
+#ifndef _ASM_MICROBLAZE_DELAY_H
+#define _ASM_MICROBLAZE_DELAY_H
+
+#include <asm/param.h>
+
+static inline void __delay(unsigned long loops)
+{
+	asm volatile ("# __delay		\n\t"		\
+			"1: addi	%0, %0, -1 \t\n"	\
+			"bneid	%0, 1b		\t\n"		\
+			"nop			\t\n"
+			: "=r" (loops)
+			: "0" (loops));
+}
+
+static inline void udelay(unsigned long usec)
+{
+	unsigned long long tmp = usec;
+	unsigned long loops = (tmp * 4295 * HZ * loops_per_jiffy) >> 32;
+	__delay(loops);
+}
+
+#endif /* _ASM_MICROBLAZE_DELAY_H */
diff --git a/include/asm-microblaze/timex.h b/include/asm-microblaze/timex.h
new file mode 100644
index 0000000..b3e77ef
--- /dev/null
+++ b/include/asm-microblaze/timex.h
@@ -0,0 +1,20 @@
+/*
+ * include/asm-microblaze/timex.h
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2006 Atmark Techno, Inc.
+ */
+
+#ifndef _ASM_MICROBLAZE_TIMEX_H
+#define _ASM_MICROBLAZE_TIMEX_H
+
+#define CLOCK_TICK_RATE 1000 /* Timer input freq. */
+
+typedef unsigned long cycles_t;
+
+#define get_cycles()	(0)
+
+#endif /* _ASM_TIMEX_H */
-- 
1.5.4.GIT

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