/*
 * Copyright 2013 Freescale Semiconductor Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of Freescale Semiconductor nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 *
 * ALTERNATIVELY, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") as published by the Free Software
 * Foundation, either version 2 of that License or (at your option) any
 * later version.
 *
 * THIS SOFTWARE IS PROVIDED BY Freescale Semiconductor ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL Freescale Semiconductor BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <linux/module.h>
#include <linux/crc64_ecma.h>


#define CRC64_BYTE_MASK			0xFF
#define CRC64_TABLE_SIZE		256


struct crc64_table {
	u64 seed;
	u64 table[CRC64_TABLE_SIZE];
};


static struct crc64_table CRC64_ECMA_182 = {
	CRC64_DEFAULT_INITVAL,
	{
		0x0000000000000000ULL,
		0xb32e4cbe03a75f6fULL,
		0xf4843657a840a05bULL,
		0x47aa7ae9abe7ff34ULL,
		0x7bd0c384ff8f5e33ULL,
		0xc8fe8f3afc28015cULL,
		0x8f54f5d357cffe68ULL,
		0x3c7ab96d5468a107ULL,
		0xf7a18709ff1ebc66ULL,
		0x448fcbb7fcb9e309ULL,
		0x0325b15e575e1c3dULL,
		0xb00bfde054f94352ULL,
		0x8c71448d0091e255ULL,
		0x3f5f08330336bd3aULL,
		0x78f572daa8d1420eULL,
		0xcbdb3e64ab761d61ULL,
		0x7d9ba13851336649ULL,
		0xceb5ed8652943926ULL,
		0x891f976ff973c612ULL,
		0x3a31dbd1fad4997dULL,
		0x064b62bcaebc387aULL,
		0xb5652e02ad1b6715ULL,
		0xf2cf54eb06fc9821ULL,
		0x41e11855055bc74eULL,
		0x8a3a2631ae2dda2fULL,
		0x39146a8fad8a8540ULL,
		0x7ebe1066066d7a74ULL,
		0xcd905cd805ca251bULL,
		0xf1eae5b551a2841cULL,
		0x42c4a90b5205db73ULL,
		0x056ed3e2f9e22447ULL,
		0xb6409f5cfa457b28ULL,
		0xfb374270a266cc92ULL,
		0x48190ecea1c193fdULL,
		0x0fb374270a266cc9ULL,
		0xbc9d3899098133a6ULL,
		0x80e781f45de992a1ULL,
		0x33c9cd4a5e4ecdceULL,
		0x7463b7a3f5a932faULL,
		0xc74dfb1df60e6d95ULL,
		0x0c96c5795d7870f4ULL,
		0xbfb889c75edf2f9bULL,
		0xf812f32ef538d0afULL,
		0x4b3cbf90f69f8fc0ULL,
		0x774606fda2f72ec7ULL,
		0xc4684a43a15071a8ULL,
		0x83c230aa0ab78e9cULL,
		0x30ec7c140910d1f3ULL,
		0x86ace348f355aadbULL,
		0x3582aff6f0f2f5b4ULL,
		0x7228d51f5b150a80ULL,
		0xc10699a158b255efULL,
		0xfd7c20cc0cdaf4e8ULL,
		0x4e526c720f7dab87ULL,
		0x09f8169ba49a54b3ULL,
		0xbad65a25a73d0bdcULL,
		0x710d64410c4b16bdULL,
		0xc22328ff0fec49d2ULL,
		0x85895216a40bb6e6ULL,
		0x36a71ea8a7ace989ULL,
		0x0adda7c5f3c4488eULL,
		0xb9f3eb7bf06317e1ULL,
		0xfe5991925b84e8d5ULL,
		0x4d77dd2c5823b7baULL,
		0x64b62bcaebc387a1ULL,
		0xd7986774e864d8ceULL,
		0x90321d9d438327faULL,
		0x231c512340247895ULL,
		0x1f66e84e144cd992ULL,
		0xac48a4f017eb86fdULL,
		0xebe2de19bc0c79c9ULL,
		0x58cc92a7bfab26a6ULL,
		0x9317acc314dd3bc7ULL,
		0x2039e07d177a64a8ULL,
		0x67939a94bc9d9b9cULL,
		0xd4bdd62abf3ac4f3ULL,
		0xe8c76f47eb5265f4ULL,
		0x5be923f9e8f53a9bULL,
		0x1c4359104312c5afULL,
		0xaf6d15ae40b59ac0ULL,
		0x192d8af2baf0e1e8ULL,
		0xaa03c64cb957be87ULL,
		0xeda9bca512b041b3ULL,
		0x5e87f01b11171edcULL,
		0x62fd4976457fbfdbULL,
		0xd1d305c846d8e0b4ULL,
		0x96797f21ed3f1f80ULL,
		0x2557339fee9840efULL,
		0xee8c0dfb45ee5d8eULL,
		0x5da24145464902e1ULL,
		0x1a083bacedaefdd5ULL,
		0xa9267712ee09a2baULL,
		0x955cce7fba6103bdULL,
		0x267282c1b9c65cd2ULL,
		0x61d8f8281221a3e6ULL,
		0xd2f6b4961186fc89ULL,
		0x9f8169ba49a54b33ULL,
		0x2caf25044a02145cULL,
		0x6b055fede1e5eb68ULL,
		0xd82b1353e242b407ULL,
		0xe451aa3eb62a1500ULL,
		0x577fe680b58d4a6fULL,
		0x10d59c691e6ab55bULL,
		0xa3fbd0d71dcdea34ULL,
		0x6820eeb3b6bbf755ULL,
		0xdb0ea20db51ca83aULL,
		0x9ca4d8e41efb570eULL,
		0x2f8a945a1d5c0861ULL,
		0x13f02d374934a966ULL,
		0xa0de61894a93f609ULL,
		0xe7741b60e174093dULL,
		0x545a57dee2d35652ULL,
		0xe21ac88218962d7aULL,
		0x5134843c1b317215ULL,
		0x169efed5b0d68d21ULL,
		0xa5b0b26bb371d24eULL,
		0x99ca0b06e7197349ULL,
		0x2ae447b8e4be2c26ULL,
		0x6d4e3d514f59d312ULL,
		0xde6071ef4cfe8c7dULL,
		0x15bb4f8be788911cULL,
		0xa6950335e42fce73ULL,
		0xe13f79dc4fc83147ULL,
		0x521135624c6f6e28ULL,
		0x6e6b8c0f1807cf2fULL,
		0xdd45c0b11ba09040ULL,
		0x9aefba58b0476f74ULL,
		0x29c1f6e6b3e0301bULL,
		0xc96c5795d7870f42ULL,
		0x7a421b2bd420502dULL,
		0x3de861c27fc7af19ULL,
		0x8ec62d7c7c60f076ULL,
		0xb2bc941128085171ULL,
		0x0192d8af2baf0e1eULL,
		0x4638a2468048f12aULL,
		0xf516eef883efae45ULL,
		0x3ecdd09c2899b324ULL,
		0x8de39c222b3eec4bULL,
		0xca49e6cb80d9137fULL,
		0x7967aa75837e4c10ULL,
		0x451d1318d716ed17ULL,
		0xf6335fa6d4b1b278ULL,
		0xb199254f7f564d4cULL,
		0x02b769f17cf11223ULL,
		0xb4f7f6ad86b4690bULL,
		0x07d9ba1385133664ULL,
		0x4073c0fa2ef4c950ULL,
		0xf35d8c442d53963fULL,
		0xcf273529793b3738ULL,
		0x7c0979977a9c6857ULL,
		0x3ba3037ed17b9763ULL,
		0x888d4fc0d2dcc80cULL,
		0x435671a479aad56dULL,
		0xf0783d1a7a0d8a02ULL,
		0xb7d247f3d1ea7536ULL,
		0x04fc0b4dd24d2a59ULL,
		0x3886b22086258b5eULL,
		0x8ba8fe9e8582d431ULL,
		0xcc0284772e652b05ULL,
		0x7f2cc8c92dc2746aULL,
		0x325b15e575e1c3d0ULL,
		0x8175595b76469cbfULL,
		0xc6df23b2dda1638bULL,
		0x75f16f0cde063ce4ULL,
		0x498bd6618a6e9de3ULL,
		0xfaa59adf89c9c28cULL,
		0xbd0fe036222e3db8ULL,
		0x0e21ac88218962d7ULL,
		0xc5fa92ec8aff7fb6ULL,
		0x76d4de52895820d9ULL,
		0x317ea4bb22bfdfedULL,
		0x8250e80521188082ULL,
		0xbe2a516875702185ULL,
		0x0d041dd676d77eeaULL,
		0x4aae673fdd3081deULL,
		0xf9802b81de97deb1ULL,
		0x4fc0b4dd24d2a599ULL,
		0xfceef8632775faf6ULL,
		0xbb44828a8c9205c2ULL,
		0x086ace348f355aadULL,
		0x34107759db5dfbaaULL,
		0x873e3be7d8faa4c5ULL,
		0xc094410e731d5bf1ULL,
		0x73ba0db070ba049eULL,
		0xb86133d4dbcc19ffULL,
		0x0b4f7f6ad86b4690ULL,
		0x4ce50583738cb9a4ULL,
		0xffcb493d702be6cbULL,
		0xc3b1f050244347ccULL,
		0x709fbcee27e418a3ULL,
		0x3735c6078c03e797ULL,
		0x841b8ab98fa4b8f8ULL,
		0xadda7c5f3c4488e3ULL,
		0x1ef430e13fe3d78cULL,
		0x595e4a08940428b8ULL,
		0xea7006b697a377d7ULL,
		0xd60abfdbc3cbd6d0ULL,
		0x6524f365c06c89bfULL,
		0x228e898c6b8b768bULL,
		0x91a0c532682c29e4ULL,
		0x5a7bfb56c35a3485ULL,
		0xe955b7e8c0fd6beaULL,
		0xaeffcd016b1a94deULL,
		0x1dd181bf68bdcbb1ULL,
		0x21ab38d23cd56ab6ULL,
		0x9285746c3f7235d9ULL,
		0xd52f0e859495caedULL,
		0x6601423b97329582ULL,
		0xd041dd676d77eeaaULL,
		0x636f91d96ed0b1c5ULL,
		0x24c5eb30c5374ef1ULL,
		0x97eba78ec690119eULL,
		0xab911ee392f8b099ULL,
		0x18bf525d915feff6ULL,
		0x5f1528b43ab810c2ULL,
		0xec3b640a391f4fadULL,
		0x27e05a6e926952ccULL,
		0x94ce16d091ce0da3ULL,
		0xd3646c393a29f297ULL,
		0x604a2087398eadf8ULL,
		0x5c3099ea6de60cffULL,
		0xef1ed5546e415390ULL,
		0xa8b4afbdc5a6aca4ULL,
		0x1b9ae303c601f3cbULL,
		0x56ed3e2f9e224471ULL,
		0xe5c372919d851b1eULL,
		0xa26908783662e42aULL,
		0x114744c635c5bb45ULL,
		0x2d3dfdab61ad1a42ULL,
		0x9e13b115620a452dULL,
		0xd9b9cbfcc9edba19ULL,
		0x6a978742ca4ae576ULL,
		0xa14cb926613cf817ULL,
		0x1262f598629ba778ULL,
		0x55c88f71c97c584cULL,
		0xe6e6c3cfcadb0723ULL,
		0xda9c7aa29eb3a624ULL,
		0x69b2361c9d14f94bULL,
		0x2e184cf536f3067fULL,
		0x9d36004b35545910ULL,
		0x2b769f17cf112238ULL,
		0x9858d3a9ccb67d57ULL,
		0xdff2a94067518263ULL,
		0x6cdce5fe64f6dd0cULL,
		0x50a65c93309e7c0bULL,
		0xe388102d33392364ULL,
		0xa4226ac498dedc50ULL,
		0x170c267a9b79833fULL,
		0xdcd7181e300f9e5eULL,
		0x6ff954a033a8c131ULL,
		0x28532e49984f3e05ULL,
		0x9b7d62f79be8616aULL,
		0xa707db9acf80c06dULL,
		0x14299724cc279f02ULL,
		0x5383edcd67c06036ULL,
		0xe0ada17364673f59ULL
	}
};


/*
 * crc64_ecma_seed - Initializes the CRC64 ECMA seed.
 */
u64 crc64_ecma_seed(void)
{
	return CRC64_ECMA_182.seed;
}
EXPORT_SYMBOL(crc64_ecma_seed);

/*
 * crc64_ecma - Computes the 64 bit ECMA CRC.
 *
 * pdata: pointer to the data to compute checksum for.
 * nbytes: number of bytes in data buffer.
 * seed: CRC seed.
 */
u64 crc64_ecma(u8 const *pdata, u32 nbytes, u64 seed)
{
	unsigned int i;
	u64 crc = seed;

	for (i = 0; i < nbytes; i++)
		crc = CRC64_ECMA_182.table[(crc ^ pdata[i]) & CRC64_BYTE_MASK] ^
			(crc >> 8);

	return crc;
}
EXPORT_SYMBOL(crc64_ecma);

MODULE_DESCRIPTION("CRC64 ECMA function");
MODULE_AUTHOR("Freescale Semiconductor Inc.");
MODULE_LICENSE("GPL");