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-rw-r--r--arch/arm/common/time-acorn.c96
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diff --git a/arch/arm/common/time-acorn.c b/arch/arm/common/time-acorn.c
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+/*
+ * 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 <asm/hardware.h>
+#include <asm/io.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, struct pt_regs *regs)
+{
+ write_seqlock(&xtime_lock);
+ timer_tick(regs);
+ write_sequnlock(&xtime_lock);
+ return IRQ_HANDLED;
+}
+
+static struct irqaction ioc_timer_irq = {
+ .name = "timer",
+ .flags = SA_INTERRUPT,
+ .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,
+};
+