platform: generic: Add Sifive FU540 TLB flush range limit override

We need to override the remote TLB flush range limit for SiFive FU540
so we add platform override to achieve this.

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

platform/generic/objects.mk

@@ -8,3 +8,4 @@
 #
 
 platform-objs-y += platform.o
+platform-objs-y += sifive_fu540.o

platform/generic/platform.c

@@ -21,7 +21,11 @@
 #include <sbi_utils/ipi/fdt_ipi.h>
 #include <sbi_utils/reset/fdt_reset.h>
 
-static const struct platform_override *special_platforms[] = { };
+extern const struct platform_override sifive_fu540;
+
+static const struct platform_override *special_platforms[] = {
+	&sifive_fu540,
+};
 
 static const struct platform_override *generic_plat = NULL;
 static const struct fdt_match *generic_plat_match = NULL;

platform/generic/sifive_fu540.c

@@ -0,0 +1,33 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2020 Western Digital Corporation or its affiliates.
+ *
+ * Authors:
+ *   Anup Patel <anup.patel@wdc.com>
+ */
+
+#include <platform_override.h>
+#include <sbi_utils/fdt/fdt_helper.h>
+
+static u64 sifive_fu540_tlbr_flush_limit(const struct fdt_match *match)
+{
+	/*
+	 * The sfence.vma by virtual address does not work on
+	 * SiFive FU540 so we return remote TLB flush limit as zero.
+	 */
+	return 0;
+}
+
+static const struct fdt_match sifive_fu540_match[] = {
+	{ .compatible = "sifive,fu540" },
+	{ .compatible = "sifive,fu540g" },
+	{ .compatible = "sifive,fu540-c000" },
+	{ .compatible = "sifive,hifive-unleashed-a00" },
+	{ },
+};
+
+const struct platform_override sifive_fu540 = {
+	.match_table = sifive_fu540_match,
+	.tlbr_flush_limit = sifive_fu540_tlbr_flush_limit,
+};