From: Greg Ungerer <gerg@snapgear.com>
Date: Thu, 8 Sep 2005 23:32:14 +0000 (+1000)
Subject: [PATCH] m68knommu: create common timer code for 68x328 processor varients
X-Git-Tag: firefly_0821_release~41290^2~5
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=75003c4812ae23a8a99e9921bbe66ffb0e784c8e;p=firefly-linux-kernel-4.4.55.git

[PATCH] m68knommu: create common timer code for 68x328 processor varients

Create common timer code for all 68x328 processor varients.

Signed-off-by: Greg Ungerer <gerg@uclinux.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/arch/m68knommu/platform/68328/timers.c b/arch/m68knommu/platform/68328/timers.c
new file mode 100644
index 000000000000..68c2cd6b0030
--- /dev/null
+++ b/arch/m68knommu/platform/68328/timers.c
@@ -0,0 +1,106 @@
+/***************************************************************************/
+
+/*
+ *  linux/arch/m68knommu/platform/68328/timers.c
+ *
+ *  Copyright (C) 1993 Hamish Macdonald
+ *  Copyright (C) 1999 D. Jeff Dionne
+ *  Copyright (C) 2001 Georges Menie, Ken Desmet
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file COPYING in the main directory of this archive
+ * for more details.
+ */
+
+/***************************************************************************/
+
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <asm/setup.h>
+#include <asm/system.h>
+#include <asm/pgtable.h>
+#include <asm/irq.h>
+#include <asm/machdep.h>
+#include <asm/MC68VZ328.h>
+
+/***************************************************************************/
+
+#if defined(CONFIG_DRAGEN2)
+/* with a 33.16 MHz clock, this will give usec resolution to the time functions */
+#define CLOCK_SOURCE	TCTL_CLKSOURCE_SYSCLK
+#define CLOCK_PRE	7
+#define TICKS_PER_JIFFY	41450
+
+#elif defined(CONFIG_XCOPILOT_BUGS)
+/*
+ * The only thing I know is that CLK32 is not available on Xcopilot
+ * I have little idea about what frequency SYSCLK has on Xcopilot.
+ * The values for prescaler and compare registers were simply
+ * taken from the original source
+ */
+#define CLOCK_SOURCE	TCTL_CLKSOURCE_SYSCLK
+#define CLOCK_PRE	2
+#define TICKS_PER_JIFFY	0xd7e4
+
+#else
+/* default to using the 32Khz clock */
+#define CLOCK_SOURCE	TCTL_CLKSOURCE_32KHZ
+#define CLOCK_PRE	31
+#define TICKS_PER_JIFFY	10
+#endif
+
+/***************************************************************************/
+
+void m68328_timer_init(irqreturn_t (*timer_routine) (int, void *, struct pt_regs *))
+{
+	/* disable timer 1 */
+	TCTL = 0;
+
+	/* set ISR */
+	if (request_irq(TMR_IRQ_NUM, timer_routine, IRQ_FLG_LOCK, "timer", NULL)) 
+		panic("Unable to attach timer interrupt\n");
+
+	/* Restart mode, Enable int, Set clock source */
+	TCTL = TCTL_OM | TCTL_IRQEN | CLOCK_SOURCE;
+	TPRER = CLOCK_PRE;
+	TCMP = TICKS_PER_JIFFY;
+
+	/* Enable timer 1 */
+	TCTL |= TCTL_TEN;
+}
+
+/***************************************************************************/
+
+void m68328_timer_tick(void)
+{
+	/* Reset Timer1 */
+	TSTAT &= 0;
+}
+/***************************************************************************/
+
+unsigned long m68328_timer_gettimeoffset(void)
+{
+	unsigned long ticks = TCN, offset = 0;
+
+	/* check for pending interrupt */
+	if (ticks < (TICKS_PER_JIFFY >> 1) && (ISR & (1 << TMR_IRQ_NUM)))
+		offset = 1000000 / HZ;
+	ticks = (ticks * 1000000 / HZ) / TICKS_PER_JIFFY;
+	return ticks + offset;
+}
+
+/***************************************************************************/
+
+void m68328_timer_gettod(int *year, int *mon, int *day, int *hour, int *min, int *sec)
+{
+	long now = RTCTIME;
+
+	*year = *mon = *day = 1;
+	*hour = (now >> 24) % 24;
+	*min = (now >> 16) % 60;
+	*sec = now % 60;
+}
+
+/***************************************************************************/