lib: Allow crc16 code to be dropped

This code is not necessarily needed in VPL, even if SPL uses it, so
adjust the rules to allow it to be dropped.

Do the same for the hash API.

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

diff --git a/common/hash.c b/common/hash.c
index 8dd9da8..0c45992 100644 (file)
--- a/common/hash.c
+++ b/common/hash.c
@@ -143,7 +143,8 @@ static int __maybe_unused hash_finish_sha512(struct hash_algo *algo, void *ctx,
        return 0;
 }
 
-static int hash_init_crc16_ccitt(struct hash_algo *algo, void **ctxp)
+static int __maybe_unused hash_init_crc16_ccitt(struct hash_algo *algo,
+                                               void **ctxp)
 {
        uint16_t *ctx = malloc(sizeof(uint16_t));
        *ctx = 0;
@@ -151,16 +152,18 @@ static int hash_init_crc16_ccitt(struct hash_algo *algo, void **ctxp)
        return 0;
 }
 
-static int hash_update_crc16_ccitt(struct hash_algo *algo, void *ctx,
-                                  const void *buf, unsigned int size,
-                                  int is_last)
+static int __maybe_unused hash_update_crc16_ccitt(struct hash_algo *algo,
+                                                 void *ctx, const void *buf,
+                                                 unsigned int size,
+                                                 int is_last)
 {
        *((uint16_t *)ctx) = crc16_ccitt(*((uint16_t *)ctx), buf, size);
        return 0;
 }
 
-static int hash_finish_crc16_ccitt(struct hash_algo *algo, void *ctx,
-                                  void *dest_buf, int size)
+static int __maybe_unused hash_finish_crc16_ccitt(struct hash_algo *algo,
+                                                 void *ctx, void *dest_buf,
+                                                 int size)
 {
        if (size < algo->digest_size)
                return -1;
@@ -295,6 +298,7 @@ static struct hash_algo hash_algo[] = {
 #endif
        },
 #endif
+#if CONFIG_IS_ENABLED(CRC16)
        {
                .name           = "crc16-ccitt",
                .digest_size    = 2,
@@ -304,6 +308,7 @@ static struct hash_algo hash_algo[] = {
                .hash_update    = hash_update_crc16_ccitt,
                .hash_finish    = hash_finish_crc16_ccitt,
        },
+#endif
 #if CONFIG_IS_ENABLED(CRC8) && IS_ENABLED(CONFIG_HASH_CRC8)
        {
                .name           = "crc8",

diff --git a/lib/Kconfig b/lib/Kconfig
index b27965f..1a683de 100644 (file)
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -758,6 +758,16 @@ config VPL_CRC8
          checksum with feedback to produce an 8-bit result. The code is small
          and it does not require a lookup table (unlike CRC32).
 
+config CRC16
+       bool "Support CRC16"
+       default y
+       help
+         Enables CRC16 support. This is normally required. Two algorithms are
+         provided:
+
+           - CCITT, with a polynomical x^16 + x^12 + x^5 + 1
+           - standard, with polynomial x^16 + x^15 + x^2 + 1 (0x8005)
+
 config SPL_CRC16
        bool "Support CRC16 in SPL"
        depends on SPL

diff --git a/lib/Makefile b/lib/Makefile
index fc6e68c..06bbbb4 100644 (file)
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -35,8 +35,6 @@ obj-$(CONFIG_CIRCBUF) += circbuf.o
 endif
 
 obj-y += crc8.o
-obj-y += crc16.o
-obj-y += crc16-ccitt.o
 obj-$(CONFIG_ERRNO_STR) += errno_str.o
 obj-$(CONFIG_FIT) += fdtdec_common.o
 obj-$(CONFIG_TEST_FDTDEC) += fdtdec_test.o
@@ -71,6 +69,7 @@ endif
 
 obj-$(CONFIG_$(PHASE_)CRC8) += crc8.o
 obj-$(CONFIG_$(PHASE_)CRC16) += crc16.o
+obj-$(CONFIG_$(PHASE_)CRC16) += crc16-ccitt.o
 
 obj-y += crypto/
 

diff --git a/tools/Kconfig b/tools/Kconfig
index 5c75af4..01ff0fc 100644 (file)
--- 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 TOOLS_CRC16
+       def_bool y
+       help
+         Enable CRC32 support in the tools builds
+
 config TOOLS_CRC32
        def_bool y
        help