ath_key.c

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/*
 * Copyright (c) 2009 Atheros Communications Inc.
 * Copyright (c) 2010 Bruno Randolf <br1@einfach.org>
 *
 * Modified for iPXE by Scott K Logan <logans@cottsay.net> July 2011
 * Original from Linux kernel 3.0.1
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include "ath.h"
#include "reg.h"

#define REG_READ                        (common->ops->read)
#define REG_WRITE(_ah, _reg, _val)      (common->ops->write)(_ah, _val, _reg)
#define ENABLE_REGWRITE_BUFFER(_ah)                     \
        if (common->ops->enable_write_buffer)           \
                common->ops->enable_write_buffer((_ah));

#define REGWRITE_BUFFER_FLUSH(_ah)                      \
        if (common->ops->write_flush)                   \
                common->ops->write_flush((_ah));


#define IEEE80211_WEP_NKID      4       /* number of key ids */

/************************/
/* Key Cache Management */
/************************/

int ath_hw_keyreset(struct ath_common *common, u16 entry)
{
        u32 keyType;
        void *ah = common->ah;

        if (entry >= common->keymax) {
                DBG("ath: keycache entry %d out of range\n", entry);
                return 0;
        }

        keyType = REG_READ(ah, AR_KEYTABLE_TYPE(entry));

        ENABLE_REGWRITE_BUFFER(ah);

        REG_WRITE(ah, AR_KEYTABLE_KEY0(entry), 0);
        REG_WRITE(ah, AR_KEYTABLE_KEY1(entry), 0);
        REG_WRITE(ah, AR_KEYTABLE_KEY2(entry), 0);
        REG_WRITE(ah, AR_KEYTABLE_KEY3(entry), 0);
        REG_WRITE(ah, AR_KEYTABLE_KEY4(entry), 0);
        REG_WRITE(ah, AR_KEYTABLE_TYPE(entry), AR_KEYTABLE_TYPE_CLR);
        REG_WRITE(ah, AR_KEYTABLE_MAC0(entry), 0);
        REG_WRITE(ah, AR_KEYTABLE_MAC1(entry), 0);

        if (keyType == AR_KEYTABLE_TYPE_TKIP) {
                u16 micentry = entry + 64;

                REG_WRITE(ah, AR_KEYTABLE_KEY0(micentry), 0);
                REG_WRITE(ah, AR_KEYTABLE_KEY1(micentry), 0);
                REG_WRITE(ah, AR_KEYTABLE_KEY2(micentry), 0);
                REG_WRITE(ah, AR_KEYTABLE_KEY3(micentry), 0);
                if (common->crypt_caps & ATH_CRYPT_CAP_MIC_COMBINED) {
                        REG_WRITE(ah, AR_KEYTABLE_KEY4(micentry), 0);
                        REG_WRITE(ah, AR_KEYTABLE_TYPE(micentry),
                                  AR_KEYTABLE_TYPE_CLR);
                }

        }

        REGWRITE_BUFFER_FLUSH(ah);

        return 1;
}