spl: fit: Eanble GZIP support for image decompression

Add Kconfig option SPL_GZIP and SPL_ZLIB to enable gunzip support for
SPL boot, eg. falcon boot compressed kernel image.

Signed-off-by: York Sun <york.sun@nxp.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

common/spl/spl_fit.c

@@ -11,6 +11,10 @@
 #include <libfdt.h>
 #include <spl.h>
 
+#ifndef CONFIG_SYS_BOOTM_LEN
+#define CONFIG_SYS_BOOTM_LEN	(64 << 20)
+#endif
+
 /**
  * spl_fit_get_image_node(): By using the matching configuration subnode,
  * retrieve the name of an image, specified by a property name and an index
@@ -135,6 +139,19 @@ static int spl_load_fit_image(struct spl_load_info *info, ulong sector,
 	ulong overhead;
 	int nr_sectors;
 	int align_len = ARCH_DMA_MINALIGN - 1;
+	uint8_t image_comp = -1, type = -1;
+
+	if (IS_ENABLED(CONFIG_SPL_OS_BOOT) && IS_ENABLED(CONFIG_SPL_GZIP)) {
+		if (fit_image_get_comp(fit, node, &image_comp))
+			puts("Cannot get image compression format.\n");
+		else
+			debug("%s ", genimg_get_comp_name(image_comp));
+
+		if (fit_image_get_type(fit, node, &type))
+			puts("Cannot get image type.\n");
+		else
+			debug("%s ", genimg_get_type_name(type));
+	}
 
 	offset = fdt_getprop_u32(fit, node, "data-offset");
 	if (offset == FDT_ERROR)
@@ -154,7 +171,7 @@ static int spl_load_fit_image(struct spl_load_info *info, ulong sector,
 	if (info->read(info, sector + get_aligned_image_offset(info, offset),
 		       nr_sectors, (void*)load_ptr) != nr_sectors)
 		return -EIO;
-	debug("image: dst=%lx, offset=%lx, size=%lx\n", load_ptr, offset,
+	debug("image dst=%lx, offset=%lx, size=%lx\n", load_ptr, offset,
 	      (unsigned long)length);
 
 	src = (void *)load_ptr + overhead;
@@ -162,7 +179,18 @@ static int spl_load_fit_image(struct spl_load_info *info, ulong sector,
 	board_fit_image_post_process(&src, &length);
 #endif
 
-	memcpy((void*)load_addr, src, length);
+	if (IS_ENABLED(CONFIG_SPL_OS_BOOT)	&&
+	    IS_ENABLED(CONFIG_SPL_GZIP)		&&
+	    image_comp == IH_COMP_GZIP		&&
+	    type == IH_TYPE_KERNEL) {
+		if (gunzip((void *)load_addr, CONFIG_SYS_BOOTM_LEN,
+			   src, &length)) {
+			puts("Uncompressing error\n");
+			return -EIO;
+		}
+	} else {
+		memcpy((void *)load_addr, src, length);
+	}
 
 	if (image_info) {
 		image_info->load_addr = load_addr;

lib/Kconfig

@@ -176,6 +176,18 @@ config LZO
 	bool "Enable LZO decompression support"
 	help
 	  This enables support for LZO compression algorithm.r
+
+config SPL_GZIP
+	bool "Enable gzip decompression support for SPL build"
+	select SPL_ZLIB
+	help
+	  This enables support for GZIP compression altorithm for SPL boot.
+
+config SPL_ZLIB
+	bool
+	help
+	  This enables compression lib for SPL boot.
+
 endmenu
 
 config ERRNO_STR

lib/Makefile

@@ -11,7 +11,6 @@ obj-$(CONFIG_EFI) += efi/
 obj-$(CONFIG_EFI_LOADER) += efi_loader/
 obj-$(CONFIG_LZMA) += lzma/
 obj-$(CONFIG_LZO) += lzo/
-obj-$(CONFIG_ZLIB) += zlib/
 obj-$(CONFIG_BZIP2) += bzip2/
 obj-$(CONFIG_TIZEN) += tizen/
 obj-$(CONFIG_FIT) += libfdt/
@@ -26,7 +25,6 @@ obj-y += crc16.o
 obj-$(CONFIG_ERRNO_STR) += errno_str.o
 obj-$(CONFIG_FIT) += fdtdec_common.o
 obj-$(CONFIG_TEST_FDTDEC) += fdtdec_test.o
-obj-$(CONFIG_GZIP) += gunzip.o
 obj-$(CONFIG_GZIP_COMPRESSED) += gzip.o
 obj-$(CONFIG_GENERATE_SMBIOS_TABLE) += smbios.o
 obj-y += initcall.o
@@ -49,6 +47,9 @@ obj-$(CONFIG_RSA) += rsa/
 obj-$(CONFIG_SHA1) += sha1.o
 obj-$(CONFIG_SHA256) += sha256.o
 
+obj-$(CONFIG_$(SPL_)ZLIB) += zlib/
+obj-$(CONFIG_$(SPL_)GZIP) += gunzip.o
+
 obj-$(CONFIG_$(SPL_TPL_)SAVEENV) += qsort.o
 obj-$(CONFIG_$(SPL_TPL_)OF_LIBFDT) += libfdt/
 ifneq ($(CONFIG_$(SPL_TPL_)BUILD)$(CONFIG_$(SPL_TPL_)OF_PLATDATA),yy)