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 <[email protected]>
Reviewed-by: Atish Patra <[email protected]>

include/sbi_utils/sys/sifive_test.h

@@ -0,0 +1,19 @@
+/*
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Copyright (c) 2020 Western Digital Corporation or its affiliates.
+ *
+ * Authors:
+ *   Anup Patel <[email protected]>
+ */
+
+#ifndef __SYS_SIFIVE_TEST_H__
+#define __SYS_SIFIVE_TEST_H__
+
+#include <sbi/sbi_types.h>
+
+int sifive_test_system_reset(u32 type);
+
+int sifive_test_init(unsigned long base);
+
+#endif

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 <[email protected]>
+ */
+
+#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;
+}

platform/qemu/virt/platform.c

@@ -18,14 +18,13 @@
 #include <sbi_utils/irqchip/plic.h>
 #include <sbi_utils/serial/uart8250.h>
 #include <sbi_utils/sys/clint.h>
+#include <sbi_utils/sys/sifive_test.h>
 
 /* clang-format off */
 
 #define VIRT_HART_COUNT			8
 
 #define VIRT_TEST_ADDR			0x100000
-#define VIRT_TEST_FINISHER_FAIL		0x3333
-#define VIRT_TEST_FINISHER_PASS		0x5555
 
 #define VIRT_CLINT_ADDR			0x2000000
 
@@ -39,6 +38,14 @@
 
 /* clang-format on */
 
+static int virt_early_init(bool cold_boot)
+{
+	if (!cold_boot)
+		return 0;
+
+	return sifive_test_init(VIRT_TEST_ADDR);
+}
+
 static int virt_final_init(bool cold_boot)
 {
 	void *fdt;
@@ -100,17 +107,8 @@ static int virt_timer_init(bool cold_boot)
 	return clint_warm_timer_init();
 }
 
-static int virt_system_reset(u32 type)
-{
-	/* Tell the "finisher" that the simulation
-	 * was successful so that QEMU exits
-	 */
-	writew(VIRT_TEST_FINISHER_PASS, (void *)VIRT_TEST_ADDR);
-
-	return 0;
-}
-
 const struct sbi_platform_operations platform_ops = {
+	.early_init		= virt_early_init,
 	.final_init		= virt_final_init,
 	.console_putc		= uart8250_putc,
 	.console_getc		= uart8250_getc,
@@ -123,7 +121,7 @@ const struct sbi_platform_operations platform_ops = {
 	.timer_event_stop	= clint_timer_event_stop,
 	.timer_event_start	= clint_timer_event_start,
 	.timer_init		= virt_timer_init,
-	.system_reset		= virt_system_reset,
+	.system_reset		= sifive_test_system_reset,
 };
 
 const struct sbi_platform platform = {