patch-2.4.19 linux-2.4.19/arch/arm/mach-clps711x/time.c

• Lines: 55
• Date: Fri Aug 2 17:39:42 2002
• Orig file: linux-2.4.18/arch/arm/mach-clps711x/time.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -urN linux-2.4.18/arch/arm/mach-clps711x/time.c linux-2.4.19/arch/arm/mach-clps711x/time.c
@@ -0,0 +1,54 @@
+/*
+ *  linux/arch/arm/mach-clps711x/time.c
+ *
+ *  Copyright (C) 2001 Deep Blue Solutions Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+#include <linux/sched.h>
+#include <linux/init.h>
+
+#include <asm/hardware.h>
+#include <asm/io.h>
+#include <asm/hardware/clps7111.h>
+
+extern unsigned long (*gettimeoffset)(void);
+
+/*
+ * gettimeoffset() returns time since last timer tick, in usecs.
+ *
+ * 'LATCH' is hwclock ticks (see CLOCK_TICK_RATE in timex.h) per jiffy.
+ * 'tick' is usecs per jiffy.
+ */
+static unsigned long clps711x_gettimeoffset(void)
+{
+	unsigned long hwticks;
+	hwticks = LATCH - (clps_readl(TC2D) & 0xffff);	/* since last underflow */
+	return (hwticks * tick) / LATCH;
+}
+
+void __init clps711x_setup_timer(void)
+{
+	unsigned int syscon;
+
+	gettimeoffset = clps711x_gettimeoffset;
+
+	syscon = clps_readl(SYSCON1);
+	syscon |= SYSCON1_TC2S | SYSCON1_TC2M;
+	clps_writel(syscon, SYSCON1);
+
+	clps_writel(LATCH-1, TC2D); /* 512kHz / 100Hz - 1 */
+
+	xtime.tv_sec = clps_readl(RTCDR);
+}