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 000000000000..d1c926596b08
--- /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);
+}