sh: Add support SH3 and SH7720

Signed-off-by: Yoshihiro Shimoda <shimoda.yoshihiro@renesas.com>
CC: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
Acked-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>

1 files changed, 103 insertions, 0 deletions

diff --git a/cpu/sh3/time.c b/cpu/sh3/time.c
new file mode 100644
index 0000000..0c273dd
--- /dev/null
+++ b/cpu/sh3/time.c
@@ -0,0 +1,103 @@
+/*
+ * (C) Copyright 2007
+ * Yoshihiro Shimoda <shimoda.yoshihiro@renesas.com>
+ *
+ * (C) Copyright 2007
+ * 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 <asm/processor.h>
+#include <asm/io.h>
+
+#define TMU_MAX_COUNTER (~0UL)
+
+static void tmu_timer_start(unsigned int timer)
+{
+	if (timer > 2)
+		return;
+
+	outb(inb(TSTR) | (1 << timer), TSTR);
+}
+
+static void tmu_timer_stop(unsigned int timer)
+{
+	u8 val = inb(TSTR);
+
+	if (timer > 2)
+		return;
+	outb(val & ~(1 << timer), TSTR);
+}
+
+int timer_init(void)
+{
+	/* Divide clock by 4 */
+	outw(0, TCR0);
+
+	tmu_timer_stop(0);
+	tmu_timer_start(0);
+	return 0;
+}
+
+/*
+   In theory we should return a true 64bit value (ie something that doesn't
+   overflow). However, we don't. Therefore if TMU runs at fastest rate of
+   6.75 MHz this value will wrap after u-boot has been running for approx
+   10 minutes.
+*/
+unsigned long long get_ticks(void)
+{
+	return (0 - inl(TCNT0));
+}
+
+unsigned long get_timer(unsigned long base)
+{
+	return ((0 - inl(TCNT0)) - base);
+}
+
+void set_timer(unsigned long t)
+{
+	outl(0 - t, TCNT0);
+}
+
+void reset_timer(void)
+{
+	tmu_timer_stop(0);
+	set_timer(0);
+	tmu_timer_start(0);
+}
+
+void udelay(unsigned long usec)
+{
+	unsigned int start = get_timer(0);
+	unsigned int end = start + (usec * ((CFG_HZ + 500000) / 1000000));
+
+	while (get_timer(0) < end)
+		continue;
+}
+
+unsigned long get_tbclk(void)
+{
+	return CFG_HZ;
+}