1 /*
2 * Copyright (c) 2009 Atheros Communications Inc.
3 * Copyright (c) 2010 Bruno Randolf <br1@einfach.org>
4 *
5 * Modified for iPXE by Scott K Logan <logans@cottsay.net> July 2011
6 * Original from Linux kernel 3.0.1
7 *
8 * Permission to use, copy, modify, and/or distribute this software for any
9 * purpose with or without fee is hereby granted, provided that the above
10 * copyright notice and this permission notice appear in all copies.
11 *
12 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
13 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
14 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
15 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
16 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
17 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
18 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
19 */
20
21 #include "ath.h"
22 #include "reg.h"
23
24 #define REG_READ (common->ops->read)
25 #define REG_WRITE(_ah, _reg, _val) (common->ops->write)(_ah, _val, _reg)
26 #define ENABLE_REGWRITE_BUFFER(_ah) \
27 if (common->ops->enable_write_buffer) \
28 common->ops->enable_write_buffer((_ah));
29
30 #define REGWRITE_BUFFER_FLUSH(_ah) \
31 if (common->ops->write_flush) \
32 common->ops->write_flush((_ah));
33
34
35 #define IEEE80211_WEP_NKID 4 /* number of key ids */
36
37 /************************/
38 /* Key Cache Management */
39 /************************/
40
ath_hw_keyreset(struct ath_common * common,u16 entry)41 int ath_hw_keyreset(struct ath_common *common, u16 entry)
42 {
43 u32 keyType;
44 void *ah = common->ah;
45
46 if (entry >= common->keymax) {
47 DBG("ath: keycache entry %d out of range\n", entry);
48 return 0;
49 }
50
51 keyType = REG_READ(ah, AR_KEYTABLE_TYPE(entry));
52
53 ENABLE_REGWRITE_BUFFER(ah);
54
55 REG_WRITE(ah, AR_KEYTABLE_KEY0(entry), 0);
56 REG_WRITE(ah, AR_KEYTABLE_KEY1(entry), 0);
57 REG_WRITE(ah, AR_KEYTABLE_KEY2(entry), 0);
58 REG_WRITE(ah, AR_KEYTABLE_KEY3(entry), 0);
59 REG_WRITE(ah, AR_KEYTABLE_KEY4(entry), 0);
60 REG_WRITE(ah, AR_KEYTABLE_TYPE(entry), AR_KEYTABLE_TYPE_CLR);
61 REG_WRITE(ah, AR_KEYTABLE_MAC0(entry), 0);
62 REG_WRITE(ah, AR_KEYTABLE_MAC1(entry), 0);
63
64 if (keyType == AR_KEYTABLE_TYPE_TKIP) {
65 u16 micentry = entry + 64;
66
67 REG_WRITE(ah, AR_KEYTABLE_KEY0(micentry), 0);
68 REG_WRITE(ah, AR_KEYTABLE_KEY1(micentry), 0);
69 REG_WRITE(ah, AR_KEYTABLE_KEY2(micentry), 0);
70 REG_WRITE(ah, AR_KEYTABLE_KEY3(micentry), 0);
71 if (common->crypt_caps & ATH_CRYPT_CAP_MIC_COMBINED) {
72 REG_WRITE(ah, AR_KEYTABLE_KEY4(micentry), 0);
73 REG_WRITE(ah, AR_KEYTABLE_TYPE(micentry),
74 AR_KEYTABLE_TYPE_CLR);
75 }
76
77 }
78
79 REGWRITE_BUFFER_FLUSH(ah);
80
81 return 1;
82 }
83