From 8e4bff4cab0ddac6060645b0715210484d02ff40 Mon Sep 17 00:00:00 2001
From: Yuval Adam <_@yuv.al>
Date: Wed, 30 Aug 2017 08:25:59 +0000
Subject: Initial file dump from open source release

---
 arch/h8300/kernel/timer/timer16.c | 77 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100644 arch/h8300/kernel/timer/timer16.c

(limited to 'arch/h8300/kernel/timer/timer16.c')

diff --git a/arch/h8300/kernel/timer/timer16.c b/arch/h8300/kernel/timer/timer16.c
new file mode 100644
index 00000000..462d9f58
--- /dev/null
+++ b/arch/h8300/kernel/timer/timer16.c
@@ -0,0 +1,77 @@
+/*
+ *  linux/arch/h8300/kernel/timer/timer16.c
+ *
+ *  Yoshinori Sato <ysato@users.sourcefoge.jp>
+ *
+ *  16bit 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>
+
+/* 16bit timer */
+#if CONFIG_H8300_TIMER16_CH == 0
+#define _16BASE	0xffff78
+#define _16IRQ	24
+#elif CONFIG_H8300_TIMER16_CH == 1
+#define _16BASE	0xffff80
+#define _16IRQ	28
+#elif CONFIG_H8300_TIMER16_CH == 2
+#define _16BASE	0xffff88
+#define _16IRQ	32
+#else
+#error Unknown timer channel.
+#endif
+
+#define TCR	0
+#define TIOR	1
+#define TCNT	2
+#define GRA	4
+#define GRB	6
+
+#define H8300_TIMER_FREQ CONFIG_CPU_CLOCK*10000 /* Timer input freq. */
+
+static irqreturn_t timer_interrupt(int irq, void *dev_id)
+{
+	h8300_timer_tick();
+	ctrl_bclr(CONFIG_H8300_TIMER16_CH, TISRA);
+	return IRQ_HANDLED;
+}
+
+static struct irqaction timer16_irq = {
+	.name		= "timer-16",
+	.handler	= timer_interrupt,
+	.flags		= IRQF_DISABLED | IRQF_TIMER,
+};
+
+static const int __initconst 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(_16IRQ, &timer16_irq);
+
+	/* initialize timer */
+	ctrl_outb(0, TSTR);
+	ctrl_outb(CCLR0 | div, _16BASE + TCR);
+	ctrl_outw(cnt, _16BASE + GRA);
+	ctrl_bset(4 + CONFIG_H8300_TIMER16_CH, TISRA);
+	ctrl_bset(CONFIG_H8300_TIMER16_CH, TSTR);
+}
-- 
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