qemu: common: Add support for dynamic mtdparts for the platform
Add support for setting the default values for mtd partitions on the
platform. This would be used for updating the firmware image using
uefi capsule update with the dfu mtd backend driver.
Currently, values have been defined for the qemu arm64 platform, with
default values defined for the mtd partitions based on the NOR
flash. This can be subsequently extended for other qemu architectures
which need mtdparts set.
Signed-off-by: Sughosh Ganu <sughosh.ganu@linaro.org>
diff --git a/board/emulation/common/qemu_mtdparts.c b/board/emulation/common/qemu_mtdparts.c
new file mode 100644
index 0000000..60212e9
--- /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);
+}