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Diffstat (limited to 'arch/h8300/kernel/timer/itu.c')
-rw-r--r--arch/h8300/kernel/timer/itu.c83
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);
+}
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