mediatek: mt8183: add timer V20 compensation

add timer driver.

Signed-off-by: Fengquan Chen <fengquan.chen@mediatek.com>
Change-Id: I60a7273f922233a618a6163b802c0858ed89f75f

2 files changed, 49 insertions, 0 deletions

diff --git a/plat/mediatek/mt8183/drivers/timer/mt_timer.c b/plat/mediatek/mt8183/drivers/timer/mt_timer.c
new file mode 100644
index 000000000..0da4815b1
--- /dev/null
+++ b/plat/mediatek/mt8183/drivers/timer/mt_timer.c
@@ -0,0 +1,29 @@
+/*
+ * Copyright (c) 2020, MediaTek Inc. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+#include <arch_helpers.h>
+#include <common/debug.h>
+#include <lib/mmio.h>
+#include <mcucfg.h>
+#include <mt_timer.h>
+#include <platform_def.h>
+
+static void enable_systimer_compensation(void)
+{
+	unsigned int reg;
+
+	reg = mmio_read_32(CNTCR_REG);
+	reg &= ~COMP_15_EN;
+	reg |= COMP_20_EN;
+	mmio_write_32(CNTCR_REG, reg);
+
+	NOTICE("[systimer] CNTCR_REG(0x%x)\n", mmio_read_32(CNTCR_REG));
+}
+
+void mt_systimer_init(void)
+{
+	/* systimer is default on, so we only enable systimer compensation */
+	enable_systimer_compensation();
+}
diff --git a/plat/mediatek/mt8183/drivers/timer/mt_timer.h b/plat/mediatek/mt8183/drivers/timer/mt_timer.h
new file mode 100644
index 000000000..0b8edc517
--- /dev/null
+++ b/plat/mediatek/mt8183/drivers/timer/mt_timer.h
@@ -0,0 +1,20 @@
+/*
+ * Copyright (c) 2020, MediaTek Inc. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef MT_TIMER_H
+#define MT_TIMER_H
+
+
+#define SYSTIMER_BASE       (0x10017000)
+#define CNTCR_REG           (SYSTIMER_BASE + 0x0)
+#define CNTSR_REG           (SYSTIMER_BASE + 0x4)
+
+#define COMP_15_EN          (1 << 10)
+#define COMP_20_EN          (1 << 11)
+
+void mt_systimer_init(void);
+
+#endif /* MT_TIMER_H */