lib: utils/timer: Add FDT based ACLINT MTIMER driver

We add a new FDT based ACLINT MTIMER driver which works for
both CLINT device and standalone ACLINT MTIMER device.

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

1 files changed, 74 insertions, 0 deletions

diff --git a/lib/utils/timer/fdt_timer_mtimer.c b/lib/utils/timer/fdt_timer_mtimer.c
new file mode 100644
index 0000000..4907428
--- /dev/null
+++ b/lib/utils/timer/fdt_timer_mtimer.c
@@ -0,0 +1,74 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2021 Western Digital Corporation or its affiliates.
+ *
+ * Authors:
+ *   Anup Patel <anup.patel@wdc.com>
+ */
+
+#include <libfdt.h>
+#include <sbi/sbi_error.h>
+#include <sbi_utils/fdt/fdt_helper.h>
+#include <sbi_utils/timer/fdt_timer.h>
+#include <sbi_utils/timer/aclint_mtimer.h>
+
+#define MTIMER_MAX_NR			16
+
+static unsigned long mtimer_count = 0;
+static struct aclint_mtimer_data mtimer[MTIMER_MAX_NR];
+
+static int timer_mtimer_cold_init(void *fdt, int nodeoff,
+				  const struct fdt_match *match)
+{
+	int rc;
+	unsigned long offset;
+	struct aclint_mtimer_data *mt, *mtmaster = NULL;
+
+	if (MTIMER_MAX_NR <= mtimer_count)
+		return SBI_ENOSPC;
+	mt = &mtimer[mtimer_count];
+	if (0 < mtimer_count)
+		mtmaster = &mtimer[0];
+
+	rc = fdt_parse_aclint_node(fdt, nodeoff, true, &mt->addr, &mt->size,
+				   &mt->first_hartid, &mt->hart_count);
+	if (rc)
+		return rc;
+	mt->has_64bit_mmio = true;
+
+	if (match->data) {
+		/* Adjust MTIMER address and size for CLINT device */
+		offset = *((unsigned long *)match->data);
+		mt->addr += offset;
+		if ((mt->size - offset) < ACLINT_MTIMER_SIZE)
+			return SBI_EINVAL;
+		mt->size -= offset;
+		/* Parse additional CLINT properties */
+		if (fdt_getprop(fdt, nodeoff, "clint,has-no-64bit-mmio", &rc))
+			mt->has_64bit_mmio = false;
+	}
+
+	rc = aclint_mtimer_cold_init(mt, mtmaster);
+	if (rc)
+		return rc;
+
+	mtimer_count++;
+	return 0;
+}
+
+static unsigned long clint_offset = CLINT_MTIMER_OFFSET;
+
+static const struct fdt_match timer_mtimer_match[] = {
+	{ .compatible = "riscv,clint0", .data = &clint_offset },
+	{ .compatible = "sifive,clint0", .data = &clint_offset },
+	{ .compatible = "riscv,aclint-mtimer" },
+	{ },
+};
+
+struct fdt_timer fdt_timer_mtimer = {
+	.match_table = timer_mtimer_match,
+	.cold_init = timer_mtimer_cold_init,
+	.warm_init = aclint_mtimer_warm_init,
+	.exit = NULL,
+};