arm: rmobile: Add basic support for Renesas R-Mobile

This patch adds minimum support for R-Mobile. Only minimal support with timer.
This CPU can uses the peripheral of Renesas SuperH.

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

1 files changed, 97 insertions, 0 deletions

diff --git a/arch/arm/cpu/armv7/rmobile/timer.c b/arch/arm/cpu/armv7/rmobile/timer.c
new file mode 100644
index 0000000..37522dc
--- /dev/null
+++ b/arch/arm/cpu/armv7/rmobile/timer.c
@@ -0,0 +1,97 @@
+/*
+ * (C) Copyright 2012 Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
+ * (C) Copyright 2012 Renesas Solutions Corp.
+ *
+ * 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/arch-armv7/globaltimer.h>
+#include <asm/arch/rmobile.h>
+
+static struct globaltimer *global_timer = \
+		(struct globaltimer *)GLOBAL_TIMER_BASE_ADDR;
+
+#define CLK2MHZ(clk)	(clk / 1000 / 1000)
+static u64 get_cpu_global_timer(void)
+{
+	u32 low, high;
+	u64 timer;
+
+	u32 old = readl(&global_timer->cnt_h);
+	while (1) {
+		low = readl(&global_timer->cnt_l);
+		high = readl(&global_timer->cnt_h);
+		if (old == high)
+			break;
+		else
+			old = high;
+	}
+
+	timer = high;
+	return (u64)((timer << 32) | low);
+}
+
+static u64 get_time_us(void)
+{
+	u64 timer = get_cpu_global_timer();
+
+	timer = ((timer << 2) + (CLK2MHZ(CONFIG_SYS_CPU_CLK) >> 1));
+	timer /= (u64)CLK2MHZ(CONFIG_SYS_CPU_CLK);
+	return timer;
+}
+
+static ulong get_time_ms(void)
+{
+	return (ulong)(get_time_us() / 1000);
+}
+
+int timer_init(void)
+{
+	writel(0x01, &global_timer->ctl);
+	return 0;
+}
+
+void __udelay(unsigned long usec)
+{
+	u64 start, current;
+	u64 wait;
+
+	start = get_cpu_global_timer();
+	wait = (u64)((usec * CLK2MHZ(CONFIG_SYS_CPU_CLK)) >> 2);
+	do {
+		current = get_cpu_global_timer();
+	} while ((current - start) < wait);
+}
+
+ulong get_timer(ulong base)
+{
+	return get_time_ms() - base;
+}
+
+unsigned long long get_ticks(void)
+{
+	return get_cpu_global_timer();
+}
+
+ulong get_tbclk(void)
+{
+	return (ulong)(CONFIG_SYS_CPU_CLK >> 2);
+}