1 files changed, 130 insertions, 0 deletions
diff --git a/arch/sh/lib/time.c b/arch/sh/lib/time.c
new file mode 100644
index 0000000..2cc61dd
--- /dev/null
+++ b/arch/sh/lib/time.c
@@ -0,0 +1,130 @@
+/*
+ * (C) Copyright 2009
+ * Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
+ *
+ * (C) Copyright 2007-2012
+ * Nobobuhiro Iwamatsu <iwamatsu@nigauri.org>
+ *
+ * (C) Copyright 2003
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * 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 <common.h>
+#include <div64.h>
+#include <asm/processor.h>
+#include <asm/io.h>
+#include <sh_tmu.h>
+
+static struct tmu_regs *tmu = (struct tmu_regs *)TMU_BASE;
+
+static u16 bit;
+static unsigned long last_tcnt;
+static unsigned long long overflow_ticks;
+
+unsigned long get_tbclk(void)
+{
+	return get_tmu0_clk_rate() >> ((bit + 1) * 2);
+}
+
+static inline unsigned long long tick_to_time(unsigned long long tick)
+{
+	tick *= CONFIG_SYS_HZ;
+	do_div(tick, get_tbclk());
+
+	return tick;
+}
+
+static inline unsigned long long usec_to_tick(unsigned long long usec)
+{
+	usec *= get_tbclk();
+	do_div(usec, 1000000);
+
+	return usec;
+}
+
+static void tmu_timer_start(unsigned int timer)
+{
+	if (timer > 2)
+		return;
+	writeb(readb(&tmu->tstr) | (1 << timer), &tmu->tstr);
+}
+
+static void tmu_timer_stop(unsigned int timer)
+{
+	if (timer > 2)
+		return;
+	writeb(readb(&tmu->tstr) & ~(1 << timer), &tmu->tstr);
+}
+
+int timer_init(void)
+{
+	bit = (ffs(CONFIG_SYS_TMU_CLK_DIV) >> 1) - 1;
+	writew(readw(&tmu->tcr0) | bit, &tmu->tcr0);
+
+	tmu_timer_stop(0);
+	tmu_timer_start(0);
+
+	last_tcnt = 0;
+	overflow_ticks = 0;
+
+	return 0;
+}
+
+unsigned long long get_ticks(void)
+{
+	unsigned long tcnt = 0 - readl(&tmu->tcnt0);
+
+	if (last_tcnt > tcnt) /* overflow */
+		overflow_ticks++;
+	last_tcnt = tcnt;
+
+	return (overflow_ticks << 32) | tcnt;
+}
+
+void __udelay(unsigned long usec)
+{
+	unsigned long long tmp;
+	ulong tmo;
+
+	tmo = usec_to_tick(usec);
+	tmp = get_ticks() + tmo;	/* get current timestamp */
+
+	while (get_ticks() < tmp)	/* loop till event */
+		 /*NOP*/;
+}
+
+unsigned long get_timer(unsigned long base)
+{
+	/* return msec */
+	return tick_to_time(get_ticks()) - base;
+}
+
+void set_timer(unsigned long t)
+{
+	writel((0 - t), &tmu->tcnt0);
+}
+
+void reset_timer(void)
+{
+	tmu_timer_stop(0);
+	set_timer(0);
+	tmu_timer_start(0);
+}