From 0ed129c9df583f22584521e42a65817a89fcd6ad Mon Sep 17 00:00:00 2001 From: Arend van Spriel Date: Tue, 23 Aug 2011 14:13:54 +0200 Subject: [PATCH] staging: brcm80211: make use of crc8 library function The crc8 function is now available as a library function provided by kernel module crc8.ko. The function has been removed from brcmutil module and srom.c now uses crc8 library function. Reviewed-by: Henry Ptasinski Reviewed-by: Roland Vossen Reviewed-by: Pieter-Paul Giesberts Signed-off-by: Arend van Spriel Signed-off-by: Greg Kroah-Hartman --- drivers/staging/brcm80211/Kconfig | 1 + drivers/staging/brcm80211/brcmsmac/srom.c | 20 +++++-- drivers/staging/brcm80211/brcmutil/utils.c | 69 ------------------------- drivers/staging/brcm80211/include/brcmu_utils.h | 5 -- 4 files changed, 17 insertions(+), 78 deletions(-) diff --git a/drivers/staging/brcm80211/Kconfig b/drivers/staging/brcm80211/Kconfig index ef77b44..816a7af 100644 --- a/drivers/staging/brcm80211/Kconfig +++ b/drivers/staging/brcm80211/Kconfig @@ -11,6 +11,7 @@ config BRCMSMAC select BRCMUTIL select FW_LOADER select CRC_CCITT + select CRC8 ---help--- This module adds support for PCIe wireless adapters based on Broadcom IEEE802.11n SoftMAC chipsets. If you choose to build a module, it'll diff --git a/drivers/staging/brcm80211/brcmsmac/srom.c b/drivers/staging/brcm80211/brcmsmac/srom.c index 7a17f59..90e2ac8 100644 --- a/drivers/staging/brcm80211/brcmsmac/srom.c +++ b/drivers/staging/brcm80211/brcmsmac/srom.c @@ -18,6 +18,7 @@ #include #include #include +#include #include #include @@ -39,6 +40,13 @@ #define WRITE_WORD_DELAY 20 #endif +/* + * SROM CRC8 polynomial value: + * + * x^8 + x^7 +x^6 + x^4 + x^2 + 1 + */ +#define SROM_CRC8_POLY 0xAB + /* Maximum srom: 6 Kilobits == 768 bytes */ #define SROM_MAX 768 @@ -782,6 +790,8 @@ static const struct brcms_sromvar perpath_pci_sromvars[] = { {NULL, 0, 0, 0, 0} }; +static u8 srom_crc8_table[CRC8_TABLE_SIZE]; + static void _initvars_srom_pci(u8 sromrev, u16 *srom, uint off, struct brcms_varbuf *b); static int initvars_srom_pci(struct si_pub *sih, void *curmap, char **vars, @@ -919,8 +929,8 @@ sprom_read_pci(struct si_pub *sih, u16 *sprom, uint wordoff, /* fixup the endianness so crc8 will pass */ htol16_buf(buf, nwords * 2); - if (brcmu_crc8((u8 *) buf, nwords * 2, CRC8_INIT_VALUE) != - CRC8_GOOD_VALUE) + if (crc8(srom_crc8_table, (u8 *) buf, nwords * 2, + CRC8_INIT_VALUE) != CRC8_GOOD_VALUE(srom_crc8_table)) /* DBG only pci always read srom4 first, then srom8/9 */ err = -EIO; @@ -957,8 +967,8 @@ static int otp_read_pci(struct si_pub *sih, u16 *buf, uint bufsz) /* fixup the endianness so crc8 will pass */ htol16_buf(buf, bufsz); - if (brcmu_crc8((u8 *) buf, SROM4_WORDS * 2, CRC8_INIT_VALUE) != - CRC8_GOOD_VALUE) + if (crc8(srom_crc8_table, (u8 *) buf, SROM4_WORDS * 2, + CRC8_INIT_VALUE) != CRC8_GOOD_VALUE(srom_crc8_table)) err = -EIO; /* now correct the endianness of the byte array */ @@ -1174,6 +1184,8 @@ static int initvars_srom_pci(struct si_pub *sih, void *curmap, char **vars, return -ENOMEM; sromwindow = (u16 *) SROM_OFFSET(sih); + + crc8_populate_lsb(srom_crc8_table, SROM_CRC8_POLY); if (ai_is_sprom_available(sih)) { err = sprom_read_pci(sih, sromwindow, 0, srom, SROM_WORDS, true); diff --git a/drivers/staging/brcm80211/brcmutil/utils.c b/drivers/staging/brcm80211/brcmutil/utils.c index 7b4d658..6280ec1 100644 --- a/drivers/staging/brcm80211/brcmutil/utils.c +++ b/drivers/staging/brcm80211/brcmutil/utils.c @@ -431,75 +431,6 @@ int brcmu_iovar_lencheck(const struct brcmu_iovar *vi, void *arg, int len, } EXPORT_SYMBOL(brcmu_iovar_lencheck); -/******************************************************************************* - * crc8 - * - * Computes a crc8 over the input data using the polynomial: - * - * x^8 + x^7 +x^6 + x^4 + x^2 + 1 - * - * The caller provides the initial value (either CRC8_INIT_VALUE - * or the previous returned value) to allow for processing of - * discontiguous blocks of data. When generating the CRC the - * caller is responsible for complementing the final return value - * and inserting it into the byte stream. When checking, a final - * return value of CRC8_GOOD_VALUE indicates a valid CRC. - * - * Reference: Dallas Semiconductor Application Note 27 - * Williams, Ross N., "A Painless Guide to CRC Error Detection Algorithms", - * ver 3, Aug 1993, ross@guest.adelaide.edu.au, Rocksoft Pty Ltd., - * ftp://ftp.rocksoft.com/clients/rocksoft/papers/crc_v3.txt - * - * **************************************************************************** - */ - -static const u8 crc8_table[256] = { - 0x00, 0xF7, 0xB9, 0x4E, 0x25, 0xD2, 0x9C, 0x6B, - 0x4A, 0xBD, 0xF3, 0x04, 0x6F, 0x98, 0xD6, 0x21, - 0x94, 0x63, 0x2D, 0xDA, 0xB1, 0x46, 0x08, 0xFF, - 0xDE, 0x29, 0x67, 0x90, 0xFB, 0x0C, 0x42, 0xB5, - 0x7F, 0x88, 0xC6, 0x31, 0x5A, 0xAD, 0xE3, 0x14, - 0x35, 0xC2, 0x8C, 0x7B, 0x10, 0xE7, 0xA9, 0x5E, - 0xEB, 0x1C, 0x52, 0xA5, 0xCE, 0x39, 0x77, 0x80, - 0xA1, 0x56, 0x18, 0xEF, 0x84, 0x73, 0x3D, 0xCA, - 0xFE, 0x09, 0x47, 0xB0, 0xDB, 0x2C, 0x62, 0x95, - 0xB4, 0x43, 0x0D, 0xFA, 0x91, 0x66, 0x28, 0xDF, - 0x6A, 0x9D, 0xD3, 0x24, 0x4F, 0xB8, 0xF6, 0x01, - 0x20, 0xD7, 0x99, 0x6E, 0x05, 0xF2, 0xBC, 0x4B, - 0x81, 0x76, 0x38, 0xCF, 0xA4, 0x53, 0x1D, 0xEA, - 0xCB, 0x3C, 0x72, 0x85, 0xEE, 0x19, 0x57, 0xA0, - 0x15, 0xE2, 0xAC, 0x5B, 0x30, 0xC7, 0x89, 0x7E, - 0x5F, 0xA8, 0xE6, 0x11, 0x7A, 0x8D, 0xC3, 0x34, - 0xAB, 0x5C, 0x12, 0xE5, 0x8E, 0x79, 0x37, 0xC0, - 0xE1, 0x16, 0x58, 0xAF, 0xC4, 0x33, 0x7D, 0x8A, - 0x3F, 0xC8, 0x86, 0x71, 0x1A, 0xED, 0xA3, 0x54, - 0x75, 0x82, 0xCC, 0x3B, 0x50, 0xA7, 0xE9, 0x1E, - 0xD4, 0x23, 0x6D, 0x9A, 0xF1, 0x06, 0x48, 0xBF, - 0x9E, 0x69, 0x27, 0xD0, 0xBB, 0x4C, 0x02, 0xF5, - 0x40, 0xB7, 0xF9, 0x0E, 0x65, 0x92, 0xDC, 0x2B, - 0x0A, 0xFD, 0xB3, 0x44, 0x2F, 0xD8, 0x96, 0x61, - 0x55, 0xA2, 0xEC, 0x1B, 0x70, 0x87, 0xC9, 0x3E, - 0x1F, 0xE8, 0xA6, 0x51, 0x3A, 0xCD, 0x83, 0x74, - 0xC1, 0x36, 0x78, 0x8F, 0xE4, 0x13, 0x5D, 0xAA, - 0x8B, 0x7C, 0x32, 0xC5, 0xAE, 0x59, 0x17, 0xE0, - 0x2A, 0xDD, 0x93, 0x64, 0x0F, 0xF8, 0xB6, 0x41, - 0x60, 0x97, 0xD9, 0x2E, 0x45, 0xB2, 0xFC, 0x0B, - 0xBE, 0x49, 0x07, 0xF0, 0x9B, 0x6C, 0x22, 0xD5, - 0xF4, 0x03, 0x4D, 0xBA, 0xD1, 0x26, 0x68, 0x9F -}; - -u8 brcmu_crc8(u8 *pdata, /* pointer to array of data to process */ - uint nbytes, /* number of input data bytes to process */ - u8 crc /* either CRC8_INIT_VALUE or previous return value */ - ) { - /* loop over the buffer data */ - while (nbytes-- > 0) - crc = crc8_table[(crc ^ *pdata++) & 0xff]; - - return crc; -} -EXPORT_SYMBOL(brcmu_crc8); - /* * Traverse a string of 1-byte tag/1-byte length/variable-length value * triples, returning a pointer to the substring whose first element diff --git a/drivers/staging/brcm80211/include/brcmu_utils.h b/drivers/staging/brcm80211/include/brcmu_utils.h index da13e24..ff8f363 100644 --- a/drivers/staging/brcm80211/include/brcmu_utils.h +++ b/drivers/staging/brcm80211/include/brcmu_utils.h @@ -246,8 +246,6 @@ extern int brcmu_iovar_lencheck(const struct brcmu_iovar *table, void *arg, #define MODSUB_POW2(x, y, bound) (((x) - (y)) & ((bound) - 1)) /* crc defines */ -#define CRC8_INIT_VALUE 0xff /* Initial CRC8 checksum value */ -#define CRC8_GOOD_VALUE 0x9f /* Good final CRC8 checksum value */ #define CRC16_INIT_VALUE 0xffff /* Initial CRC16 checksum value */ #define CRC16_GOOD_VALUE 0xf0b8 /* Good final CRC16 checksum value */ @@ -268,9 +266,6 @@ struct brcmu_tlv { #define ETHER_ADDR_STR_LEN 18 /* externs */ -/* crc */ -extern u8 brcmu_crc8(u8 *p, uint nbytes, u8 crc); - /* format/print */ #if defined(BCMDBG) extern int brcmu_format_flags(const struct brcmu_bit_desc *bd, u32 flags, -- 2.7.4