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authorHaavard Skinnemoen <haavard.skinnemoen@atmel.com>2008-12-17 16:53:07 +0100
committerHaavard Skinnemoen <haavard.skinnemoen@atmel.com>2008-12-17 16:53:07 +0100
commitcb5473205206c7f14cbb1e747f28ec75b48826e2 (patch)
tree8f4808d60917100b18a10b05230f7638a0a9bbcc /drivers/mtd/ubi/crc32defs.h
parentbaf449fc5ff96f071bb0e3789fd3265f6d4fd9a0 (diff)
parent92c78a3bbcb2ce508b4bf1c4a1e0940406a024bb (diff)
Merge branch 'fixes' into cleanups
Conflicts: board/atmel/atngw100/atngw100.c board/atmel/atstk1000/atstk1000.c cpu/at32ap/at32ap700x/gpio.c include/asm-avr32/arch-at32ap700x/clk.h include/configs/atngw100.h include/configs/atstk1002.h include/configs/atstk1003.h include/configs/atstk1004.h include/configs/atstk1006.h include/configs/favr-32-ezkit.h include/configs/hammerhead.h include/configs/mimc200.h
Diffstat (limited to 'drivers/mtd/ubi/crc32defs.h')
-rw-r--r--drivers/mtd/ubi/crc32defs.h32
1 files changed, 32 insertions, 0 deletions
diff --git a/drivers/mtd/ubi/crc32defs.h b/drivers/mtd/ubi/crc32defs.h
new file mode 100644
index 000000000..f5a540176
--- /dev/null
+++ b/drivers/mtd/ubi/crc32defs.h
@@ -0,0 +1,32 @@
+/*
+ * There are multiple 16-bit CRC polynomials in common use, but this is
+ * *the* standard CRC-32 polynomial, first popularized by Ethernet.
+ * x^32+x^26+x^23+x^22+x^16+x^12+x^11+x^10+x^8+x^7+x^5+x^4+x^2+x^1+x^0
+ */
+#define CRCPOLY_LE 0xedb88320
+#define CRCPOLY_BE 0x04c11db7
+
+/* How many bits at a time to use. Requires a table of 4<<CRC_xx_BITS bytes. */
+/* For less performance-sensitive, use 4 */
+#ifndef CRC_LE_BITS
+# define CRC_LE_BITS 8
+#endif
+#ifndef CRC_BE_BITS
+# define CRC_BE_BITS 8
+#endif
+
+/*
+ * Little-endian CRC computation. Used with serial bit streams sent
+ * lsbit-first. Be sure to use cpu_to_le32() to append the computed CRC.
+ */
+#if CRC_LE_BITS > 8 || CRC_LE_BITS < 1 || CRC_LE_BITS & CRC_LE_BITS-1
+# error CRC_LE_BITS must be a power of 2 between 1 and 8
+#endif
+
+/*
+ * Big-endian CRC computation. Used with serial bit streams sent
+ * msbit-first. Be sure to use cpu_to_be32() to append the computed CRC.
+ */
+#if CRC_BE_BITS > 8 || CRC_BE_BITS < 1 || CRC_BE_BITS & CRC_BE_BITS-1
+# error CRC_BE_BITS must be a power of 2 between 1 and 8
+#endif