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Message-Id: <3bcb9581bc512fdd0a124ac8322af9e2a8adc975.1201107832.git.monstr@monstr.eu>
Date: Thu, 24 Jan 2008 16:02:59 +0100
From: monstr@...str.eu
To: monstr@...str.eu
Cc: linux-kernel@...r.kernel.org, stephen.neuendorffer@...inx.com,
john.williams@...alogix.com, microblaze-uclinux@...e.uq.edu.au
Subject: [PATCH 24/52] [microblaze] time support
From: Michal Simek <monstr@...str.eu>
Signed-off-by: Michal Simek <monstr@...str.eu>
---
arch/microblaze/kernel/time.c | 90 ++++++++++++++++++++++++++++++++++++++++
include/asm-microblaze/delay.h | 28 ++++++++++++
include/asm-microblaze/timex.h | 21 +++++++++
3 files changed, 139 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..1eaa74c
--- /dev/null
+++ b/include/asm-microblaze/delay.h
@@ -0,0 +1,28 @@
+/*
+ * 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_DELAY_H
+#define _ASM_DELAY_H
+
+extern 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)
+{
+}
+
+#endif /* _ASM_DELAY_H */
diff --git a/include/asm-microblaze/timex.h b/include/asm-microblaze/timex.h
new file mode 100644
index 0000000..17d2f11
--- /dev/null
+++ b/include/asm-microblaze/timex.h
@@ -0,0 +1,21 @@
+/*
+ * 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.
+ * FIXME -- need review
+ */
+
+#ifndef _ASM_TIMEX_H
+#define _ASM_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.rc4.14.g6fc74
--
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