From: Sascha Hauer <s.hauer@pengutronix.de>
To: Barebox List <barebox@lists.infradead.org>
Subject: [PATCH 2/6] crc: Add PBL variant for crc_itu_t()
Date: Mon, 4 Mar 2019 12:38:19 +0100 [thread overview]
Message-ID: <20190304113823.21535-3-s.hauer@pengutronix.de> (raw)
In-Reply-To: <20190304113823.21535-1-s.hauer@pengutronix.de>
Enable crc_itu_t() for PBL. For the PBL use the slower-but-smaller
variant without table.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
crypto/Makefile | 2 +-
include/crc.h | 16 ++++++++++++++++
2 files changed, 17 insertions(+), 1 deletion(-)
diff --git a/crypto/Makefile b/crypto/Makefile
index 0014b0f4ce..3402f57255 100644
--- a/crypto/Makefile
+++ b/crypto/Makefile
@@ -1,5 +1,5 @@
obj-$(CONFIG_CRC32) += crc32.o
-obj-$(CONFIG_CRC_ITU_T) += crc-itu-t.o
+obj-pbl-$(CONFIG_CRC_ITU_T) += crc-itu-t.o
obj-$(CONFIG_CRC7) += crc7.o
obj-$(CONFIG_DIGEST) += digest.o
obj-$(CONFIG_DIGEST_CRC32_GENERIC) += crc32_digest.o
diff --git a/include/crc.h b/include/crc.h
index 317f6f5494..a67388f732 100644
--- a/include/crc.h
+++ b/include/crc.h
@@ -13,10 +13,26 @@ extern u16 const crc_itu_t_table[256];
extern u16 crc_itu_t(u16 crc, const u8 *buffer, size_t len);
+#ifdef __PBL__
+static inline u16 crc_itu_t_byte(u16 crc, const u8 data)
+{
+ int i;
+
+ crc = crc ^ data << 8;
+ for (i = 0; i < 8; ++i) {
+ if (crc & 0x8000)
+ crc = crc << 1 ^ 0x1021;
+ else
+ crc = crc << 1;
+ }
+ return crc;
+}
+#else
static inline u16 crc_itu_t_byte(u16 crc, const u8 data)
{
return (crc << 8) ^ crc_itu_t_table[((crc >> 8) ^ data) & 0xff];
}
+#endif
uint32_t crc32(uint32_t, const void *, unsigned int);
uint32_t crc32_no_comp(uint32_t, const void *, unsigned int);
--
2.20.1
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next prev parent reply other threads:[~2019-03-04 11:38 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-04 11:38 [PATCH 0/6] SPD EEPROM improvements Sascha Hauer
2019-03-04 11:38 ` [PATCH 1/6] crc: import crc_itu_t() from kernel Sascha Hauer
2019-03-04 11:50 ` Sam Ravnborg
2019-03-04 13:19 ` Sascha Hauer
2019-03-04 11:38 ` Sascha Hauer [this message]
2019-03-04 11:38 ` [PATCH 3/6] ddr_spd: Update from U-Boot Sascha Hauer
2019-03-04 11:38 ` [PATCH 4/6] ddr_spd: Add function to read eeprom Sascha Hauer
2019-03-04 11:53 ` Sam Ravnborg
2019-03-04 12:02 ` Sam Ravnborg
2019-03-04 13:22 ` Sascha Hauer
2019-03-04 11:38 ` [PATCH 5/6] ddr_spd: provide common SPD type Sascha Hauer
2019-03-04 11:38 ` [PATCH 6/6] ddr_spd: Enable in PBL Sascha Hauer
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