[PATCH v2 28/50] image: Drop IMAGE_ENABLE_CRC32

[Simon Glass <sjg@chromium.org>]

Add a host Kconfig for CRC32. With this we can use CONFIG_IS_ENABLED(CRC32)
directly in the host build, so drop the unnecessary indirection.

Add a few more conditions to SPL_CRC32 to avoid build failures as well as
TPL_CRC32. Also update hash.c to make crc32 optional.

Signed-off-by: Simon Glass <sjg@chromium.org>
---

(no changes since v1)

 common/hash.c      | 13 ++++++++-----
 common/image-fit.c |  2 +-
 common/spl/Kconfig | 13 ++++++++++++-
 include/image.h    |  8 --------
 lib/Kconfig        |  5 +++++
 lib/Makefile       |  4 +---
 tools/Kconfig      |  5 +++++
 7 files changed, 32 insertions(+), 18 deletions(-)

diff --git a/common/hash.c b/common/hash.c
index 1ccc62f162d..67e81e6150d 100644
--- a/common/hash.c
+++ b/common/hash.c
@@ -178,7 +178,7 @@ static int hash_finish_crc16_ccitt(struct hash_algo *algo, void *ctx,
 	return 0;
 }
 
-static int hash_init_crc32(struct hash_algo *algo, void **ctxp)
+static int __maybe_unused hash_init_crc32(struct hash_algo *algo, void **ctxp)
 {
 	uint32_t *ctx = malloc(sizeof(uint32_t));
 	*ctx = 0;
@@ -186,15 +186,16 @@ static int hash_init_crc32(struct hash_algo *algo, void **ctxp)
 	return 0;
 }
 
-static int hash_update_crc32(struct hash_algo *algo, void *ctx,
-			     const void *buf, unsigned int size, int is_last)
+static int __maybe_unused hash_update_crc32(struct hash_algo *algo, void *ctx,
+					    const void *buf, unsigned int size,
+					    int is_last)
 {
 	*((uint32_t *)ctx) = crc32(*((uint32_t *)ctx), buf, size);
 	return 0;
 }
 
-static int hash_finish_crc32(struct hash_algo *algo, void *ctx, void *dest_buf,
-			     int size)
+static int __maybe_unused hash_finish_crc32(struct hash_algo *algo, void *ctx,
+					    void *dest_buf, int size)
 {
 	if (size < algo->digest_size)
 		return -1;
@@ -303,6 +304,7 @@ static struct hash_algo hash_algo[] = {
 		.hash_update	= hash_update_crc16_ccitt,
 		.hash_finish	= hash_finish_crc16_ccitt,
 	},
+#if CONFIG_IS_ENABLED(CRC32)
 	{
 		.name		= "crc32",
 		.digest_size	= 4,
@@ -312,6 +314,7 @@ static struct hash_algo hash_algo[] = {
 		.hash_update	= hash_update_crc32,
 		.hash_finish	= hash_finish_crc32,
 	},
+#endif
 };
 
 /* Try to minimize code size for boards that don't want much hashing */
diff --git a/common/image-fit.c b/common/image-fit.c
index a16e2dd54a5..1ce46a5c72d 100644
--- a/common/image-fit.c
+++ b/common/image-fit.c
@@ -1213,7 +1213,7 @@ int fit_set_timestamp(void *fit, int noffset, time_t timestamp)
 int calculate_hash(const void *data, int data_len, const char *algo,
 			uint8_t *value, int *value_len)
 {
-	if (IMAGE_ENABLE_CRC32 && strcmp(algo, "crc32") == 0) {
+	if (CONFIG_IS_ENABLED(CRC32) && strcmp(algo, "crc32") == 0) {
 		*((uint32_t *)value) = crc32_wd(0, data, data_len,
 							CHUNKSZ_CRC32);
 		*((uint32_t *)value) = cpu_to_uimage(*((uint32_t *)value));
diff --git a/common/spl/Kconfig b/common/spl/Kconfig
index 39fc260566b..8cd41eb1b29 100644
--- a/common/spl/Kconfig
+++ b/common/spl/Kconfig
@@ -409,7 +409,8 @@ config SYS_MMCSD_RAW_MODE_EMMC_BOOT_PARTITION
 
 config SPL_CRC32
 	bool "Support CRC32"
-	default y if SPL_LEGACY_IMAGE_SUPPORT
+	default y if SPL_LEGACY_IMAGE_SUPPORT || SPL_EFI_PARTITION
+	default y if SPL_ENV_SUPPORT || TPL_BLOBLIST
 	help
 	  Enable this to support CRC32 in uImages or FIT images within SPL.
 	  This is a 32-bit checksum value that can be used to verify images.
@@ -1530,6 +1531,16 @@ config TPL_BOOTROM_SUPPORT
 	  BOOT_DEVICE_BOOTROM (or fall-through to the next boot device in the
 	  boot device list, if not implemented for a given board)
 
+config TPL_CRC32
+	bool "Support CRC32 in TPL"
+	default y if TPL_ENV_SUPPORT || TPL_BLOBLIST
+	help
+	  Enable this to support CRC32 in uImages or FIT images within SPL.
+	  This is a 32-bit checksum value that can be used to verify images.
+	  For FIT images, this is the least secure type of checksum, suitable
+	  for detected accidental image corruption. For secure applications you
+	  should consider SHA1 or SHA256.
+
 config TPL_DRIVERS_MISC_SUPPORT
 	bool "Support misc drivers in TPL"
 	help
diff --git a/include/image.h b/include/image.h
index 5aedc1bb23b..e68c2cbf621 100644
--- a/include/image.h
+++ b/include/image.h
@@ -47,9 +47,6 @@ struct fdt_region;
 #include <linux/libfdt.h>
 #include <fdt_support.h>
 # ifdef CONFIG_SPL_BUILD
-#  ifdef CONFIG_SPL_CRC32
-#   define IMAGE_ENABLE_CRC32	1
-#  endif
 #  ifdef CONFIG_SPL_MD5_SUPPORT
 #   define IMAGE_ENABLE_MD5	1
 #  endif
@@ -57,15 +54,10 @@ struct fdt_region;
 #   define IMAGE_ENABLE_SHA1	1
 #  endif
 # else
-#  define IMAGE_ENABLE_CRC32	1
 #  define IMAGE_ENABLE_MD5	1
 #  define IMAGE_ENABLE_SHA1	1
 # endif
 
-#ifndef IMAGE_ENABLE_CRC32
-#define IMAGE_ENABLE_CRC32	0
-#endif
-
 #ifndef IMAGE_ENABLE_MD5
 #define IMAGE_ENABLE_MD5	0
 #endif
diff --git a/lib/Kconfig b/lib/Kconfig
index 6d2d41de301..7d9bf8f6f4e 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -422,6 +422,11 @@ config SPL_MD5
 	  security applications, but it can be useful for providing a quick
 	  checksum of a block of data.
 
+config CRC32
+	def_bool y
+	help
+	  Enables CRC32 support in U-Boot. This is normally required.
+
 config CRC32C
 	bool
 
diff --git a/lib/Makefile b/lib/Makefile
index 39acbac123b..da943891bd8 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -94,9 +94,7 @@ obj-y += display_options.o
 CFLAGS_display_options.o := $(if $(BUILD_TAG),-DBUILD_TAG='"$(BUILD_TAG)"')
 obj-$(CONFIG_BCH) += bch.o
 obj-$(CONFIG_MMC_SPI) += crc7.o
-#ifndef CONFIG_TPL_BUILD
-obj-y += crc32.o
-#endif
+obj-$(CONFIG_$(SPL_TPL_)CRC32) += crc32.o
 obj-$(CONFIG_CRC32C) += crc32c.o
 obj-y += ctype.o
 obj-y += div64.o
diff --git a/tools/Kconfig b/tools/Kconfig
index 8bd782cf5b9..e27826fae9f 100644
--- a/tools/Kconfig
+++ b/tools/Kconfig
@@ -9,6 +9,11 @@ config MKIMAGE_DTC_PATH
 	  some cases the system dtc may not support all required features
 	  and the path to a different version should be given here.
 
+config HOST_CRC32
+	def_bool y
+	help
+	  Enable CRC32 support in the host build
+
 config HOST_FIT
 	def_bool y
 	help
-- 
2.31.1.607.g51e8a6a459-goog