lib: utils: Add SiFive test device

This patch factor-out SiFive test device related stuff into
it's own source file from qemu/virt platform. In future, we
can find SiFive test device address from device tree as well.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>

lib/utils/sys/objects.mk

@@ -9,3 +9,4 @@
 
 libsbiutils-objs-y += sys/clint.o
 libsbiutils-objs-y += sys/htif.o
+libsbiutils-objs-y += sys/sifive_test.o

lib/utils/sys/sifive_test.c

@@ -0,0 +1,44 @@
+/*
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Copyright (c) 2020 Western Digital Corporation or its affiliates.
+ *
+ * Authors:
+ *   Anup Patel <anup.patel@wdc.com>
+ */
+
+#include <sbi/riscv_io.h>
+#include <sbi/sbi_platform.h>
+#include <sbi_utils/sys/sifive_test.h>
+
+#define FINISHER_FAIL		0x3333
+#define FINISHER_PASS		0x5555
+#define FINISHER_RESET		0x7777
+
+static void *sifive_test_base;
+
+int sifive_test_system_reset(u32 type)
+{
+	/*
+	 * Tell the "finisher" that the simulation
+	 * was successful so that QEMU exits
+	 */
+	switch (type) {
+	case SBI_PLATFORM_RESET_SHUTDOWN:
+		writew(FINISHER_PASS, sifive_test_base);
+		break;
+	case SBI_PLATFORM_RESET_COLD:
+	case SBI_PLATFORM_RESET_WARM:
+		writew(FINISHER_RESET, sifive_test_base);
+		break;
+	}
+
+	return 0;
+}
+
+int sifive_test_init(unsigned long base)
+{
+	sifive_test_base = (void *)base;
+
+	return 0;
+}