From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001
From: André Fabian Silva Delgado <emulatorman@parabola.nu>
Date: Wed, 5 Aug 2015 17:04:01 -0300
Subject: Initial import

---
 arch/m68k/hp300/time.c | 77 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100644 arch/m68k/hp300/time.c

(limited to 'arch/m68k/hp300/time.c')

diff --git a/arch/m68k/hp300/time.c b/arch/m68k/hp300/time.c
new file mode 100644
index 000000000..749543b42
--- /dev/null
+++ b/arch/m68k/hp300/time.c
@@ -0,0 +1,77 @@
+/*
+ *  linux/arch/m68k/hp300/time.c
+ *
+ *  Copyright (C) 1998 Philip Blundell <philb@gnu.org>
+ *
+ *  This file contains the HP300-specific time handling code.
+ */
+
+#include <asm/ptrace.h>
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/kernel_stat.h>
+#include <linux/interrupt.h>
+#include <asm/machdep.h>
+#include <asm/irq.h>
+#include <asm/io.h>
+#include <asm/traps.h>
+#include <asm/blinken.h>
+
+/* Clock hardware definitions */
+
+#define CLOCKBASE	0xf05f8000
+
+#define	CLKCR1		0x1
+#define	CLKCR2		0x3
+#define	CLKCR3		CLKCR1
+#define	CLKSR		CLKCR2
+#define	CLKMSB1		0x5
+#define	CLKMSB2		0x9
+#define	CLKMSB3		0xD
+
+/* This is for machines which generate the exact clock. */
+#define USECS_PER_JIFFY (1000000/HZ)
+
+#define INTVAL ((10000 / 4) - 1)
+
+static irqreturn_t hp300_tick(int irq, void *dev_id)
+{
+	unsigned long tmp;
+	irq_handler_t vector = dev_id;
+	in_8(CLOCKBASE + CLKSR);
+	asm volatile ("movpw %1@(5),%0" : "=d" (tmp) : "a" (CLOCKBASE));
+	/* Turn off the network and SCSI leds */
+	blinken_leds(0, 0xe0);
+	return vector(irq, NULL);
+}
+
+u32 hp300_gettimeoffset(void)
+{
+  /* Read current timer 1 value */
+  unsigned char lsb, msb1, msb2;
+  unsigned short ticks;
+
+  msb1 = in_8(CLOCKBASE + 5);
+  lsb = in_8(CLOCKBASE + 7);
+  msb2 = in_8(CLOCKBASE + 5);
+  if (msb1 != msb2)
+    /* A carry happened while we were reading.  Read it again */
+    lsb = in_8(CLOCKBASE + 7);
+  ticks = INTVAL - ((msb2 << 8) | lsb);
+  return ((USECS_PER_JIFFY * ticks) / INTVAL) * 1000;
+}
+
+void __init hp300_sched_init(irq_handler_t vector)
+{
+  out_8(CLOCKBASE + CLKCR2, 0x1);		/* select CR1 */
+  out_8(CLOCKBASE + CLKCR1, 0x1);		/* reset */
+
+  asm volatile(" movpw %0,%1@(5)" : : "d" (INTVAL), "a" (CLOCKBASE));
+
+  if (request_irq(IRQ_AUTO_6, hp300_tick, 0, "timer tick", vector))
+    pr_err("Couldn't register timer interrupt\n");
+
+  out_8(CLOCKBASE + CLKCR2, 0x1);		/* select CR1 */
+  out_8(CLOCKBASE + CLKCR1, 0x40);		/* enable irq */
+}
-- 
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