arm: initial support for Marvell Dove SoCs

This commit adds minimal support for the Marvell Dove SoC (88AP510) as
first SoC of the Marvell Orion family. Orion SoCs have a different timer,
therefore current mach-mvebu and Armada 370/XP Kconfig and Makefiles are
slightly modified and a new clocksource drivers is added.

Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

3 files changed, 81 insertions, 0 deletions

diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
index dfc89ddea8..4ef25ec45b 100644
--- a/drivers/clocksource/Kconfig
+++ b/drivers/clocksource/Kconfig
@@ -21,3 +21,7 @@ config CLOCKSOURCE_MVEBU
 config CLOCKSOURCE_NOMADIK
 	bool
 	depends on ARM
+
+config CLOCKSOURCE_ORION
+	bool
+	depends on ARCH_MVEBU
diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile
index 0b42ce48d6..25b7f460da 100644
--- a/drivers/clocksource/Makefile
+++ b/drivers/clocksource/Makefile
@@ -4,3 +4,4 @@ obj-$(CONFIG_CLOCKSOURCE_BCM2835) += bcm2835.o
 obj-$(CONFIG_CLOCKSOURCE_CLPS711X) += clps711x.o
 obj-$(CONFIG_CLOCKSOURCE_MVEBU)   += mvebu.o
 obj-$(CONFIG_CLOCKSOURCE_NOMADIK) += nomadik.o
+obj-$(CONFIG_CLOCKSOURCE_ORION)   += orion.o
diff --git a/drivers/clocksource/orion.c b/drivers/clocksource/orion.c
new file mode 100644
index 0000000000..604b414742
--- /dev/null
+++ b/drivers/clocksource/orion.c
@@ -0,0 +1,76 @@
+/*
+ * Copyright
+ * (C) 2013 Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
+ *
+ * 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.
+ *
+ */
+
+#include <common.h>
+#include <init.h>
+#include <clock.h>
+#include <linux/clk.h>
+#include <io.h>
+
+#define TIMER_CTRL		0x00
+#define  TIMER0_EN		BIT(0)
+#define  TIMER0_RELOAD_EN	BIT(1)
+#define  TIMER1_EN		BIT(2)
+#define  TIMER1_RELOAD_EN	BIT(3)
+#define TIMER0_RELOAD		0x10
+#define TIMER0_VAL		0x14
+#define TIMER1_RELOAD		0x18
+#define TIMER1_VAL		0x1c
+
+static __iomem void *timer_base;
+
+static uint64_t orion_clocksource_read(void)
+{
+	return __raw_readl(timer_base + TIMER0_VAL);
+}
+
+static struct clocksource clksrc = {
+	.read	= orion_clocksource_read,
+	.mask	= CLOCKSOURCE_MASK(32),
+	.shift	= 10,
+};
+
+static int orion_timer_probe(struct device_d *dev)
+{
+	struct clk *tclk;
+	uint32_t val;
+
+	timer_base = dev_request_mem_region(dev, 0);
+	tclk = clk_get(dev, "tclk");
+
+	/* setup TIMER0 as free-running clock source */
+	__raw_writel(~0, timer_base + TIMER0_VAL);
+	__raw_writel(~0, timer_base + TIMER0_RELOAD);
+	val = __raw_readl(timer_base + TIMER_CTRL);
+	__raw_writel(val | TIMER0_EN | TIMER0_RELOAD_EN,
+		     timer_base + TIMER_CTRL);
+
+	clksrc.mult = clocksource_hz2mult(clk_get_rate(tclk), clksrc.shift);
+	init_clock(&clksrc);
+
+	return 0;
+}
+
+static struct driver_d orion_timer_driver = {
+	.name = "orion-timer",
+	.probe = orion_timer_probe,
+};
+
+static int orion_timer_init(void)
+{
+	return platform_driver_register(&orion_timer_driver);
+}
+postcore_initcall(orion_timer_init);