1 files changed, 82 insertions, 0 deletions
diff --git a/board/emulation/common/qemu_mtdparts.c b/board/emulation/common/qemu_mtdparts.c
new file mode 100644
index 0000000000..60212e97ac
--- /dev/null
+++ b/board/emulation/common/qemu_mtdparts.c
@@ -0,0 +1,82 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (c) 2020 Linaro Limited
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <mtd.h>
+
+#include <linux/string.h>
+
+#define MTDPARTS_LEN		256
+#define MTDIDS_LEN		128
+
+static void board_get_mtdparts(const char *dev, const char *partition,
+			       char *mtdids, char *mtdparts)
+{
+	/* mtdids: "<dev>=<dev>, ...." */
+	if (mtdids[0] != '\0')
+		strcat(mtdids, ",");
+	strcat(mtdids, dev);
+	strcat(mtdids, "=");
+	strcat(mtdids, dev);
+
+	/* mtdparts: "mtdparts=<dev>:<mtdparts_<dev>>;..." */
+	if (mtdparts[0] != '\0')
+		strncat(mtdparts, ";", MTDPARTS_LEN);
+	else
+		strcat(mtdparts, "mtdparts=");
+
+	strncat(mtdparts, dev, MTDPARTS_LEN);
+	strncat(mtdparts, ":", MTDPARTS_LEN);
+	strncat(mtdparts, partition, MTDPARTS_LEN);
+}
+
+void board_mtdparts_default(const char **mtdids, const char **mtdparts)
+{
+	struct mtd_info *mtd;
+	struct udevice *dev;
+	const char *mtd_partition;
+	static char parts[3 * MTDPARTS_LEN + 1];
+	static char ids[MTDIDS_LEN + 1];
+	static bool mtd_initialized;
+
+	if (mtd_initialized) {
+		*mtdids = ids;
+		*mtdparts = parts;
+		return;
+	}
+
+	memset(parts, 0, sizeof(parts));
+	memset(ids, 0, sizeof(ids));
+
+	/* Currently mtdparts is needed on Qemu ARM64 for capsule updates */
+	if (IS_ENABLED(CONFIG_EFI_CAPSULE_FIRMWARE_MANAGEMENT) &&
+	    IS_ENABLED(CONFIG_TARGET_QEMU_ARM_64BIT)) {
+		/* probe all MTD devices */
+		for (uclass_first_device(UCLASS_MTD, &dev); dev;
+		     uclass_next_device(&dev)) {
+			debug("mtd device = %s\n", dev->name);
+		}
+
+		mtd = get_mtd_device_nm("nor0");
+		if (!IS_ERR_OR_NULL(mtd)) {
+			mtd_partition = CONFIG_MTDPARTS_NOR0;
+			board_get_mtdparts("nor0", mtd_partition, ids, parts);
+			put_mtd_device(mtd);
+		}
+
+		mtd = get_mtd_device_nm("nor1");
+		if (!IS_ERR_OR_NULL(mtd)) {
+			mtd_partition = CONFIG_MTDPARTS_NOR1;
+			board_get_mtdparts("nor1", mtd_partition, ids, parts);
+			put_mtd_device(mtd);
+		}
+	}
+
+	mtd_initialized = true;
+	*mtdids = ids;
+	*mtdparts = parts;
+	debug("%s:mtdids=%s & mtdparts=%s\n", __func__, ids, parts);
+}