sys/external/isc/atheros_hal/dist/ar5210/ar5210_keycache.c

   1 /*
   2  * Copyright (c) 2002-2008 Sam Leffler, Errno Consulting
   3  * Copyright (c) 2002-2004 Atheros Communications, Inc.
   4  *
   5  * Permission to use, copy, modify, and/or distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16  *
  17  * $Id: ar5210_keycache.c,v 1.1.1.1 2008/12/11 04:46:27 alc Exp $
  18  */
  19 #include "opt_ah.h"
  20
  21 #include "ah.h"
  22 #include "ah_internal.h"
  23
  24 #include "ar5210/ar5210.h"
  25 #include "ar5210/ar5210reg.h"
  26
  27 #define AR_KEYTABLE_SIZE        64
  28 #define KEY_XOR                 0xaa
  29
  30 /*
  31  * Return the size of the hardware key cache.
  32  */
  33 u_int
  34 ar5210GetKeyCacheSize(struct ath_hal *ah)
  35 {
  36         return AR_KEYTABLE_SIZE;
  37 }
  38
  39 /*
  40  * Return the size of the hardware key cache.
  41  */
  42 HAL_BOOL
  43 ar5210IsKeyCacheEntryValid(struct ath_hal *ah, uint16_t entry)
  44 {
  45         if (entry < AR_KEYTABLE_SIZE) {
  46                 uint32_t val = OS_REG_READ(ah, AR_KEYTABLE_MAC1(entry));
  47                 if (val & AR_KEYTABLE_VALID)
  48                         return AH_TRUE;
  49         }
  50         return AH_FALSE;
  51 }
  52
  53 /*
  54  * Clear the specified key cache entry.
  55  */
  56 HAL_BOOL
  57 ar5210ResetKeyCacheEntry(struct ath_hal *ah, uint16_t entry)
  58 {
  59         if (entry < AR_KEYTABLE_SIZE) {
  60                 OS_REG_WRITE(ah, AR_KEYTABLE_KEY0(entry), 0);
  61                 OS_REG_WRITE(ah, AR_KEYTABLE_KEY1(entry), 0);
  62                 OS_REG_WRITE(ah, AR_KEYTABLE_KEY2(entry), 0);
  63                 OS_REG_WRITE(ah, AR_KEYTABLE_KEY3(entry), 0);
  64                 OS_REG_WRITE(ah, AR_KEYTABLE_KEY4(entry), 0);
  65                 OS_REG_WRITE(ah, AR_KEYTABLE_TYPE(entry), 0);
  66                 OS_REG_WRITE(ah, AR_KEYTABLE_MAC0(entry), 0);
  67                 OS_REG_WRITE(ah, AR_KEYTABLE_MAC1(entry), 0);
  68                 return AH_TRUE;
  69         }
  70         return AH_FALSE;
  71 }
  72
  73 /*
  74  * Sets the mac part of the specified key cache entry and mark it valid.
  75  */
  76 HAL_BOOL
  77 ar5210SetKeyCacheEntryMac(struct ath_hal *ah, uint16_t entry, const uint8_t *mac)
  78 {
  79         uint32_t macHi, macLo;
  80
  81         if (entry < AR_KEYTABLE_SIZE) {
  82                 /*
  83                  * Set MAC address -- shifted right by 1.  MacLo is
  84                  * the 4 MSBs, and MacHi is the 2 LSBs.
  85                  */
  86                 if (mac != AH_NULL) {
  87                         macHi = (mac[5] << 8) | mac[4];
  88                         macLo = (mac[3] << 24)| (mac[2] << 16)
  89                               | (mac[1] << 8) | mac[0];
  90                         macLo >>= 1;
  91                         macLo |= (macHi & 1) << 31;     /* carry */
  92                         macHi >>= 1;
  93                 } else {
  94                         macLo = macHi = 0;
  95                 }
  96
  97                 OS_REG_WRITE(ah, AR_KEYTABLE_MAC0(entry), macLo);
  98                 OS_REG_WRITE(ah, AR_KEYTABLE_MAC1(entry),
  99                         macHi | AR_KEYTABLE_VALID);
 100                 return AH_TRUE;
 101         }
 102         return AH_FALSE;
 103 }
 104
 105 /*
 106  * Sets the contents of the specified key cache entry.
 107  */
 108 HAL_BOOL
 109 ar5210SetKeyCacheEntry(struct ath_hal *ah, uint16_t entry,
 110                        const HAL_KEYVAL *k, const uint8_t *mac, int xorKey)
 111 {
 112         uint32_t key0, key1, key2, key3, key4;
 113         uint32_t keyType;
 114         uint32_t xorMask= xorKey ?
 115                 (KEY_XOR << 24 | KEY_XOR << 16 | KEY_XOR << 8 | KEY_XOR) : 0;
 116
 117         if (entry >= AR_KEYTABLE_SIZE)
 118                 return AH_FALSE;
 119         if (k->kv_type != HAL_CIPHER_WEP) {
 120                 HALDEBUG(ah, HAL_DEBUG_ANY, "%s: cipher %u not supported\n",
 121                     __func__, k->kv_type);
 122                 return AH_FALSE;
 123         }
 124
 125         /* NB: only WEP supported */
 126         if (k->kv_len < 40 / NBBY)
 127                 return AH_FALSE;
 128         if (k->kv_len <= 40 / NBBY)
 129                 keyType = AR_KEYTABLE_TYPE_40;
 130         else if (k->kv_len <= 104 / NBBY)
 131                 keyType = AR_KEYTABLE_TYPE_104;
 132         else
 133                 keyType = AR_KEYTABLE_TYPE_128;
 134
 135         key0 = LE_READ_4(k->kv_val+0) ^ xorMask;
 136         key1 = (LE_READ_2(k->kv_val+4) ^ xorMask) & 0xffff;
 137         key2 = LE_READ_4(k->kv_val+6) ^ xorMask;
 138         key3 = (LE_READ_2(k->kv_val+10) ^ xorMask) & 0xffff;
 139         key4 = LE_READ_4(k->kv_val+12) ^ xorMask;
 140         if (k->kv_len <= 104 / NBBY)
 141                 key4 &= 0xff;
 142
 143         /*
 144          * Note: WEP key cache hardware requires that each double-word
 145          * pair be written in even/odd order (since the destination is
 146          * a 64-bit register).  Don't reorder these writes w/o
 147          * understanding this!
 148          */
 149         OS_REG_WRITE(ah, AR_KEYTABLE_KEY0(entry), key0);
 150         OS_REG_WRITE(ah, AR_KEYTABLE_KEY1(entry), key1);
 151         OS_REG_WRITE(ah, AR_KEYTABLE_KEY2(entry), key2);
 152         OS_REG_WRITE(ah, AR_KEYTABLE_KEY3(entry), key3);
 153         OS_REG_WRITE(ah, AR_KEYTABLE_KEY4(entry), key4);
 154         OS_REG_WRITE(ah, AR_KEYTABLE_TYPE(entry), keyType);
 155         return ar5210SetKeyCacheEntryMac(ah, entry, mac);
 156 }