1 files changed, 87 insertions, 0 deletions
diff --git a/drivers/timer/arm_global_timer.c b/drivers/timer/arm_global_timer.c
new file mode 100644
index 0000000000..065f10bb74
--- /dev/null
+++ b/drivers/timer/arm_global_timer.c
@@ -0,0 +1,87 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2017, STMicroelectronics - All Rights Reserved
+ * Author(s): Patrice Chotard, <patrice.chotard@foss.st.com> for STMicroelectronics.
+ *
+ * ARM Cortext A9 global timer driver
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <clk.h>
+#include <timer.h>
+#include <linux/err.h>
+
+#include <asm/io.h>
+#include <asm/arch-armv7/globaltimer.h>
+
+struct arm_global_timer_priv {
+	struct globaltimer *global_timer;
+};
+
+static u64 arm_global_timer_get_count(struct udevice *dev)
+{
+	struct arm_global_timer_priv *priv = dev_get_priv(dev);
+	struct globaltimer *global_timer = priv->global_timer;
+	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 int arm_global_timer_probe(struct udevice *dev)
+{
+	struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
+	struct arm_global_timer_priv *priv = dev_get_priv(dev);
+	struct clk clk;
+	int err;
+	ulong ret;
+
+	/* get arm global timer base address */
+	priv->global_timer = (struct globaltimer *)dev_read_addr_ptr(dev);
+	if (!priv->global_timer)
+		return -ENOENT;
+
+	err = clk_get_by_index(dev, 0, &clk);
+	if (!err) {
+		ret = clk_get_rate(&clk);
+		if (IS_ERR_VALUE(ret))
+			return ret;
+		uc_priv->clock_rate = ret;
+	} else {
+		uc_priv->clock_rate = CONFIG_SYS_HZ_CLOCK;
+	}
+
+	/* init timer */
+	writel(0x01, &priv->global_timer->ctl);
+
+	return 0;
+}
+
+static const struct timer_ops arm_global_timer_ops = {
+	.get_count = arm_global_timer_get_count,
+};
+
+static const struct udevice_id arm_global_timer_ids[] = {
+	{ .compatible = "arm,cortex-a9-global-timer" },
+	{}
+};
+
+U_BOOT_DRIVER(arm_global_timer) = {
+	.name = "arm_global_timer",
+	.id = UCLASS_TIMER,
+	.of_match = arm_global_timer_ids,
+	.priv_auto	= sizeof(struct arm_global_timer_priv),
+	.probe = arm_global_timer_probe,
+	.ops = &arm_global_timer_ops,
+};