lib: utils/timer: Add ACLINT MTIMER library

We add common ACLINT MTIMER library similar to the CLINT library
so that OpenSBI platforms can use it.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Xiang W <wxjstz@126.com>

include/sbi_utils/timer/aclint_mtimer.h

@@ -0,0 +1,41 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2021 Western Digital Corporation or its affiliates.
+ *
+ * Authors:
+ *   Anup Patel <anup.patel@wdc.com>
+ */
+
+#ifndef __TIMER_ACLINT_MTIMER_H__
+#define __TIMER_ACLINT_MTIMER_H__
+
+#include <sbi/sbi_types.h>
+
+#define ACLINT_MTIMER_ALIGN		0x1000
+#define ACLINT_MTIMER_SIZE		0x8000
+#define ACLINT_MTIMER_MAX_HARTS	4095
+
+#define CLINT_MTIMER_OFFSET		0x4000
+
+struct aclint_mtimer_data {
+	/* Public details */
+	unsigned long addr;
+	unsigned long size;
+	u32 first_hartid;
+	u32 hart_count;
+	bool has_64bit_mmio;
+	/* Private details (initialized and used by ACLINT MTIMER library) */
+	struct aclint_mtimer_data *time_delta_reference;
+	unsigned long time_delta_computed;
+	u64 time_delta;
+	u64 (*time_rd)(volatile u64 *addr);
+	void (*time_wr)(bool timecmp, u64 value, volatile u64 *addr);
+};
+
+int aclint_mtimer_warm_init(void);
+
+int aclint_mtimer_cold_init(struct aclint_mtimer_data *mt,
+			    struct aclint_mtimer_data *reference);
+
+#endif