cmd: Add unlz4 command

This command is a new command called "unlz4" that decompresses from memory
into memory.
Used with the CONFIG_CMD_UNLZ4 optionenabled.

Signed-off-by: Yusuke Ashiduka <ashiduka@fujitsu.com>
[trini: Use %zd / %zX not %ld / %lX in printf]
Signed-off-by: Tom Rini <trini@konsulko.com>

cmd/Kconfig

@@ -770,6 +770,13 @@ config CMD_LZMADEC
 	  Support decompressing an LZMA (Lempel-Ziv-Markov chain algorithm)
 	  image from memory.
 
+config CMD_UNLZ4
+	bool "unlz4"
+	default y if CMD_BOOTI
+	select LZ4
+	help
+	  Support decompressing an LZ4 image from memory region.
+
 config CMD_UNZIP
 	bool "unzip"
 	default y if CMD_BOOTI

cmd/Makefile

@@ -144,6 +144,7 @@ obj-$(CONFIG_CMD_TSI148) += tsi148.o
 obj-$(CONFIG_CMD_UBI) += ubi.o
 obj-$(CONFIG_CMD_UBIFS) += ubifs.o
 obj-$(CONFIG_CMD_UNIVERSE) += universe.o
+obj-$(CONFIG_CMD_UNLZ4) += unlz4.o
 obj-$(CONFIG_CMD_UNZIP) += unzip.o
 obj-$(CONFIG_CMD_VIRTIO) += virtio.o
 obj-$(CONFIG_CMD_WDT) += wdt.o

cmd/unlz4.c

@@ -0,0 +1,45 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2020
+ * FUJITSU COMPUTERTECHNOLOGIES LIMITED. All rights reserved.
+ */
+
+#include <common.h>
+#include <command.h>
+#include <env.h>
+#include <lz4.h>
+
+static int do_unlz4(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+	unsigned long src, dst;
+	size_t src_len = ~0UL, dst_len = ~0UL;
+	int ret;
+
+	switch (argc) {
+	case 4:
+		src = simple_strtoul(argv[1], NULL, 16);
+		dst = simple_strtoul(argv[2], NULL, 16);
+		dst_len = simple_strtoul(argv[3], NULL, 16);
+		break;
+	default:
+		return CMD_RET_USAGE;
+	}
+
+	ret = ulz4fn((void *)src, src_len, (void *)dst, &dst_len);
+	if (ret) {
+		printf("Uncompressed err :%d\n", ret);
+		return 1;
+	}
+
+	printf("Uncompressed size: %zd = 0x%zX\n", dst_len, dst_len);
+	env_set_hex("filesize", dst_len);
+
+	return 0;
+}
+
+U_BOOT_CMD(unlz4, 4, 1, do_unlz4,
+	   "lz4 uncompress a memory region",
+	   "srcaddr dstaddr dstsize\n"
+	   "NOTE: Specify the destination size that is sufficiently larger\n"
+	   " than the source size.\n"
+);