1 files changed, 83 insertions, 0 deletions
diff --git a/arch/h8300/kernel/timer/itu.c b/arch/h8300/kernel/timer/itu.c
new file mode 100644
index 0000000..d1c9265
--- /dev/null
+++ b/arch/h8300/kernel/timer/itu.c
@@ -0,0 +1,83 @@
+/*
+ *  linux/arch/h8300/kernel/timer/itu.c
+ *
+ *  Yoshinori Sato <ysato@users.sourcefoge.jp>
+ *
+ *  ITU Timer Handler
+ *
+ */
+
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/param.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <linux/init.h>
+#include <linux/timex.h>
+
+#include <asm/segment.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/regs306x.h>
+
+#if CONFIG_H8300_ITU_CH == 0
+#define ITUBASE	0xffff64
+#define ITUIRQ	24
+#elif CONFIG_H8300_ITU_CH == 1
+#define ITUBASE	0xffff6e
+#define ITUIRQ	28
+#elif CONFIG_H8300_ITU_CH == 2
+#define ITUBASE	0xffff78
+#define ITUIRQ	32
+#elif CONFIG_H8300_ITU_CH == 3
+#define ITUBASE	0xffff82
+#define ITUIRQ	36
+#elif CONFIG_H8300_ITU_CH == 4
+#define ITUBASE	0xffff92
+#define ITUIRQ	40
+#else
+#error Unknown timer channel.
+#endif
+
+#define TCR	0
+#define TIOR	1
+#define TIER	2
+#define TSR	3
+#define TCNT	4
+#define GRA	6
+#define GRB	8
+
+static irqreturn_t timer_interrupt(int irq, void *dev_id)
+{
+	h8300_timer_tick();
+	ctrl_bclr(IMFA, ITUBASE + TSR);
+	return IRQ_HANDLED;
+}
+
+static struct irqaction itu_irq = {
+	.name		= "itu",
+	.handler	= timer_interrupt,
+	.flags		= IRQF_DISABLED | IRQF_TIMER,
+	.mask		= CPU_MASK_NONE,
+};
+
+static const int __initdata divide_rate[] = {1, 2, 4, 8};
+
+void __init h8300_timer_setup(void)
+{
+	unsigned int div;
+	unsigned int cnt;
+
+	calc_param(cnt, div, divide_rate, 0x10000);
+
+	setup_irq(ITUIRQ, &itu_irq);
+
+	/* initalize timer */
+	ctrl_outb(0, TSTR);
+	ctrl_outb(CCLR0 | div, ITUBASE + TCR);
+	ctrl_outb(0x01, ITUBASE + TIER);
+	ctrl_outw(cnt, ITUBASE + GRA);
+	ctrl_bset(CONFIG_H8300_ITU_CH, TSTR);
+}