From 849369d6c66d3054688672f97d31fceb8e8230fb Mon Sep 17 00:00:00 2001
From: root <root@artemis.panaceas.org>
Date: Fri, 25 Dec 2015 04:40:36 +0000
Subject: initial_commit

---
 arch/arm/common/time-acorn.c | 95 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 95 insertions(+)
 create mode 100644 arch/arm/common/time-acorn.c

(limited to 'arch/arm/common/time-acorn.c')

diff --git a/arch/arm/common/time-acorn.c b/arch/arm/common/time-acorn.c
new file mode 100644
index 00000000..deeed561
--- /dev/null
+++ b/arch/arm/common/time-acorn.c
@@ -0,0 +1,95 @@
+/*
+ *  linux/arch/arm/common/time-acorn.c
+ *
+ *  Copyright (c) 1996-2000 Russell King.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ *  Changelog:
+ *   24-Sep-1996	RMK	Created
+ *   10-Oct-1996	RMK	Brought up to date with arch-sa110eval
+ *   04-Dec-1997	RMK	Updated for new arch/arm/time.c
+ *   13=Jun-2004	DS	Moved to arch/arm/common b/c shared w/CLPS7500
+ */
+#include <linux/timex.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+
+#include <mach/hardware.h>
+#include <asm/hardware/ioc.h>
+
+#include <asm/mach/time.h>
+
+unsigned long ioc_timer_gettimeoffset(void)
+{
+	unsigned int count1, count2, status;
+	long offset;
+
+	ioc_writeb (0, IOC_T0LATCH);
+	barrier ();
+	count1 = ioc_readb(IOC_T0CNTL) | (ioc_readb(IOC_T0CNTH) << 8);
+	barrier ();
+	status = ioc_readb(IOC_IRQREQA);
+	barrier ();
+	ioc_writeb (0, IOC_T0LATCH);
+	barrier ();
+	count2 = ioc_readb(IOC_T0CNTL) | (ioc_readb(IOC_T0CNTH) << 8);
+
+	offset = count2;
+	if (count2 < count1) {
+		/*
+		 * We have not had an interrupt between reading count1
+		 * and count2.
+		 */
+		if (status & (1 << 5))
+			offset -= LATCH;
+	} else if (count2 > count1) {
+		/*
+		 * We have just had another interrupt between reading
+		 * count1 and count2.
+		 */
+		offset -= LATCH;
+	}
+
+	offset = (LATCH - offset) * (tick_nsec / 1000);
+	return (offset + LATCH/2) / LATCH;
+}
+
+void __init ioctime_init(void)
+{
+	ioc_writeb(LATCH & 255, IOC_T0LTCHL);
+	ioc_writeb(LATCH >> 8, IOC_T0LTCHH);
+	ioc_writeb(0, IOC_T0GO);
+}
+
+static irqreturn_t
+ioc_timer_interrupt(int irq, void *dev_id)
+{
+	timer_tick();
+	return IRQ_HANDLED;
+}
+
+static struct irqaction ioc_timer_irq = {
+	.name		= "timer",
+	.flags		= IRQF_DISABLED,
+	.handler	= ioc_timer_interrupt
+};
+
+/*
+ * Set up timer interrupt.
+ */
+static void __init ioc_timer_init(void)
+{
+	ioctime_init();
+	setup_irq(IRQ_TIMER, &ioc_timer_irq);
+}
+
+struct sys_timer ioc_timer = {
+	.init		= ioc_timer_init,
+	.offset		= ioc_timer_gettimeoffset,
+};
+
-- 
cgit v1.2.3