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>

3 files changed, 182 insertions, 18 deletions

diff --git a/lib_sh/Makefile b/lib_sh/Makefile
index 40343812f74..f7c6479426d 100644
--- a/lib_sh/Makefile
+++ b/lib_sh/Makefile
@@ -26,7 +26,11 @@ SOBJS-y	+=
 
 COBJS-y	+= board.o
 COBJS-y	+= bootm.o
-# COBJS-y	+= time.o
+ifeq ($(CONFIG_SH2),y)
+COBJS-y	+= time_sh2.o
+else
+COBJS-y	+= time.o
+endif
 
 SRCS	:= $(SOBJS-y:.o=.S) $(COBJS-y:.o=.c)
 OBJS	:= $(addprefix $(obj),$(SOBJS-y) $(COBJS-y))
diff --git a/lib_sh/time.c b/lib_sh/time.c
index e637e95a316..2bd77152825 100644
--- a/lib_sh/time.c
+++ b/lib_sh/time.c
@@ -1,6 +1,9 @@
 /*
- * Copyright (c) 2007
- * Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
+ * (C) Copyright 2007-2008
+ * 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.
@@ -23,50 +26,96 @@
 
 #include <common.h>
 #include <asm/processor.h>
+#include <asm/io.h>
+
+#define TMU_MAX_COUNTER (~0UL)
+static int clk_adj = 1;
 
 static void tmu_timer_start (unsigned int timer)
 {
 	if (timer > 2)
 		return;
+	writeb(readb(TSTR) | (1 << timer), TSTR);
+}
 
-	*((volatile unsigned char *) TSTR0) |= (1 << timer);
+static void tmu_timer_stop (unsigned int timer)
+{
+	if (timer > 2)
+		return;
+	writeb(readb(TSTR) & ~(1 << timer), TSTR);
 }
 
 int timer_init (void)
 {
-	*(volatile u16 *)TCR0 = 0;
+	/* Divide clock by TMU_CLK_DIVIDER */
+	u16 bit = 0;
+	switch( TMU_CLK_DIVIDER ){
+	case 4:
+		bit = 0;
+		break;
+	case 16:
+		bit = 1;
+		break;
+	case 64: bit = 2;
+		break;
+	case 256:
+		bit = 3;
+		break;
+	case 1024:
+		bit = 4;
+		break;
+	default:
+		bit = 0;
+		break;
+	}
+	writew(readw(TCR0) | bit, TCR0);
+
+	/* Clock adjustment calc */
+	clk_adj = (int)(1.0/((1.0/CONFIG_SYS_HZ)*1000000));
+	if (clk_adj < 1)
+		clk_adj = 1;
+
+	tmu_timer_stop(0);
+	tmu_timer_start(0);
 
-	tmu_timer_start (0);
 	return 0;
 }
 
 unsigned long long get_ticks (void)
 {
-	return (0 - *((volatile unsigned int *) TCNT0));
+	return 0 - readl(TCNT0);
 }
 
-unsigned long get_timer (unsigned long base)
+static unsigned long get_usec (void)
 {
-	return ((0 - *((volatile unsigned int *) TCNT0)) - base);
+	return (0 - readl(TCNT0));
 }
 
-void set_timer (unsigned long t)
+void udelay (unsigned long usec)
 {
-	*((volatile unsigned int *) TCNT0) = (0 - t);
+	unsigned int start = get_usec();
+	unsigned int end = start + (usec * clk_adj);
+
+	while (get_usec() < end)
+		continue;
 }
 
-void reset_timer (void)
+unsigned long get_timer (unsigned long base)
 {
-	set_timer (0);
+	/*  return msec */
+	return ((get_usec()/clk_adj)/1000) - base;
 }
 
-void udelay (unsigned long usec)
+void set_timer (unsigned long t)
 {
-	unsigned int start = get_timer (0);
-	unsigned int end = start + (usec * ((CONFIG_SYS_HZ + 500000) / 1000000));
+	writel((0 - t), TCNT0);
+}
 
-	while (get_timer (0) < end)
-		continue;
+void reset_timer (void)
+{
+	tmu_timer_stop(0);
+	set_timer (0);
+	tmu_timer_start(0);
 }
 
 unsigned long get_tbclk (void)
diff --git a/lib_sh/time_sh2.c b/lib_sh/time_sh2.c
new file mode 100644
index 00000000000..fcbb921c8c7
--- /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;
+}