sh: Update sh timer function

Change to write/readX function and fix timer problem.

Signed-off-by: Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>

1 files changed, 111 insertions, 0 deletions

diff --git a/lib_sh/time_sh2.c b/lib_sh/time_sh2.c
new file mode 100644
index 0000000..fcbb921
--- /dev/null
+++ b/lib_sh/time_sh2.c
@@ -0,0 +1,111 @@
+/*
+ * Copyright (C) 2007,2008 Nobobuhiro Iwamatsu <iwamatsu@nigauri.org>
+ * Copyright (C) 2008 Renesas Solutions Corp.
+ *
+ * (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/io.h>
+#include <asm/processor.h>
+
+#define CMT_CMCSR_INIT  0x0001	/* PCLK/32 */
+#define CMT_CMCSR_CALIB 0x0000
+#define CMT_MAX_COUNTER (0xFFFFFFFF)
+#define CMT_TIMER_RESET (0xFFFF)
+
+static vu_long cmt0_timer;
+
+static void cmt_timer_start(unsigned int timer)
+{
+	writew(readw(CMSTR) | 0x01, CMSTR);
+}
+
+static void cmt_timer_stop(unsigned int timer)
+{
+	writew(readw(CMSTR) & ~0x01, CMSTR);
+}
+
+int timer_init(void)
+{
+	cmt0_timer = 0;
+	/* Divide clock by 32 */
+	readw(CMCSR_0);
+	writew(CMT_CMCSR_INIT, CMCSR_0);
+
+	/* User Device 0 only */
+	cmt_timer_stop(0);
+	set_timer(CMT_TIMER_RESET);
+	cmt_timer_start(0);
+
+	return 0;
+}
+
+unsigned long long get_ticks(void)
+{
+	return cmt0_timer;
+}
+
+static vu_long cmcnt;
+ulong get_timer(ulong base)
+{
+	ulong data = readw(CMCNT_0);
+
+	if (data >= cmcnt)
+		cmcnt = data - cmcnt;
+	else
+		cmcnt = (CMT_TIMER_RESET - cmcnt) + data;
+
+	if ((cmt0_timer + cmcnt) > CMT_MAX_COUNTER)
+		cmt0_timer = ((cmt0_timer + cmcnt) - CMT_MAX_COUNTER);
+	else
+		cmt0_timer += cmcnt;
+
+	cmcnt = data;
+	return cmt0_timer - base;
+}
+
+void set_timer(ulong t)
+{
+	writew((u16) t, CMCOR_0);
+}
+
+void reset_timer(void)
+{
+	cmt_timer_stop(0);
+	set_timer(CMT_TIMER_RESET);
+	cmt0_timer = 0;
+	cmt_timer_start(0);
+}
+
+void udelay(unsigned long usec)
+{
+	unsigned int start = get_timer(0);
+
+	while (get_timer((ulong) start) < (usec * (CONFIG_SYS_HZ / 1000000)))
+		continue;
+}
+
+unsigned long get_tbclk(void)
+{
+	return CONFIG_SYS_HZ;
+}