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Diffstat (limited to 'arch/arm/mach-uniphier/arm64/timer.c')
-rw-r--r--arch/arm/mach-uniphier/arm64/timer.c38
1 files changed, 38 insertions, 0 deletions
diff --git a/arch/arm/mach-uniphier/arm64/timer.c b/arch/arm/mach-uniphier/arm64/timer.c
new file mode 100644
index 0000000000..4beab9dca8
--- /dev/null
+++ b/arch/arm/mach-uniphier/arm64/timer.c
@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2016 Masahiro Yamada <yamada.masahiro@socionext.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <mapmem.h>
+#include <linux/bitops.h>
+#include <linux/io.h>
+#include <linux/sizes.h>
+
+#define CNT_CONTROL_BASE 0x60E00000
+
+#define CNTCR 0x000
+#define CNTCR_EN BIT(0)
+
+/* setup ARMv8 Generic Timer */
+int timer_init(void)
+{
+ void __iomem *base;
+ u32 tmp;
+
+ base = map_sysmem(CNT_CONTROL_BASE, SZ_4K);
+
+ /*
+ * Note:
+ * In a system that implements both Secure and Non-secure states,
+ * this register is only writable in Secure state.
+ */
+ tmp = readl(base + CNTCR);
+ tmp |= CNTCR_EN;
+ writel(tmp, base + CNTCR);
+
+ unmap_sysmem(base);
+
+ return 0;
+}