1 /******************************************************************************
2 *
3 * Copyright(c) 2003 - 2009 Intel Corporation. All rights reserved.
4 *
5 * Portions of this file are derived from the ipw3945 project, as well
6 * as portions of the ieee80211 subsystem header files.
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of version 2 of the GNU General Public License as
10 * published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope that it will be useful, but WITHOUT
13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 * more details.
16 *
17 * You should have received a copy of the GNU General Public License along with
18 * this program; if not, write to the Free Software Foundation, Inc.,
19 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
20 *
21 * The full GNU General Public License is included in this distribution in the
22 * file called LICENSE.
23 *
24 * Contact Information:
25 * Intel Linux Wireless <ilw@linux.intel.com>
26 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
27 *
28 *****************************************************************************/
29
30 #ifndef __iwl_helpers_h__
31 #define __iwl_helpers_h__
32
33 #include <linux/ctype.h>
34
35 #define IWL_MASK(lo, hi) ((1 << (hi)) | ((1 << (hi)) - (1 << (lo))))
36
37
38 static inline struct ieee80211_conf *ieee80211_get_hw_conf(
39 struct ieee80211_hw *hw)
40 {
41 return &hw->conf;
42 }
43
44 static inline int iwl_check_bits(unsigned long field, unsigned long mask)
45 {
46 return ((field & mask) == mask) ? 1 : 0;
47 }
48
49 static inline unsigned long elapsed_jiffies(unsigned long start,
50 unsigned long end)
51 {
52 if (end >= start)
53 return end - start;
54
55 return end + (MAX_JIFFY_OFFSET - start) + 1;
56 }
57
58 /**
59 * iwl_queue_inc_wrap - increment queue index, wrap back to beginning
60 * @index -- current index
61 * @n_bd -- total number of entries in queue (must be power of 2)
62 */
63 static inline int iwl_queue_inc_wrap(int index, int n_bd)
64 {
65 return ++index & (n_bd - 1);
66 }
67
68 /**
69 * iwl_queue_dec_wrap - decrement queue index, wrap back to end
70 * @index -- current index
71 * @n_bd -- total number of entries in queue (must be power of 2)
72 */
73 static inline int iwl_queue_dec_wrap(int index, int n_bd)
74 {
75 return --index & (n_bd - 1);
76 }
77
78 /* TODO: Move fw_desc functions to iwl-pci.ko */
79 static inline void iwl_free_fw_desc(struct pci_dev *pci_dev,
80 struct fw_desc *desc)
81 {
82 if (desc->v_addr)
83 pci_free_consistent(pci_dev, desc->len,
84 desc->v_addr, desc->p_addr);
85 desc->v_addr = NULL;
86 desc->len = 0;
87 }
88
89 static inline int iwl_alloc_fw_desc(struct pci_dev *pci_dev,
90 struct fw_desc *desc)
91 {
92 desc->v_addr = pci_alloc_consistent(pci_dev, desc->len, &desc->p_addr);
93 return (desc->v_addr != NULL) ? 0 : -ENOMEM;
94 }
95
96 /*
97 * we have 8 bits used like this:
98 *
99 * 7 6 5 4 3 2 1 0
100 * | | | | | | | |
101 * | | | | | | +-+-------- AC queue (0-3)
102 * | | | | | |
103 * | +-+-+-+-+------------ HW A-MPDU queue
104 * |
105 * +---------------------- indicates agg queue
106 */
107 static inline u8 iwl_virtual_agg_queue_num(u8 ac, u8 hwq)
108 {
109 BUG_ON(ac > 3); /* only have 2 bits */
110 BUG_ON(hwq > 31); /* only have 5 bits */
111
112 return 0x80 | (hwq << 2) | ac;
113 }
114
115 static inline void iwl_wake_queue(struct iwl_priv *priv, u8 queue)
116 {
117 u8 ac = queue;
118 u8 hwq = queue;
119
120 if (queue & 0x80) {
121 ac = queue & 3;
122 hwq = (queue >> 2) & 0x1f;
123 }
124
125 if (test_and_clear_bit(hwq, priv->queue_stopped))
126 if (atomic_dec_return(&priv->queue_stop_count[ac]) <= 0)
127 ieee80211_wake_queue(priv->hw, ac);
128 }
129
130 static inline void iwl_stop_queue(struct iwl_priv *priv, u8 queue)
131 {
132 u8 ac = queue;
133 u8 hwq = queue;
134
135 if (queue & 0x80) {
136 ac = queue & 3;
137 hwq = (queue >> 2) & 0x1f;
138 }
139
140 if (!test_and_set_bit(hwq, priv->queue_stopped))
141 if (atomic_inc_return(&priv->queue_stop_count[ac]) > 0)
142 ieee80211_stop_queue(priv->hw, ac);
143 }
144
145 #define ieee80211_stop_queue DO_NOT_USE_ieee80211_stop_queue
146 #define ieee80211_wake_queue DO_NOT_USE_ieee80211_wake_queue
147
148 #endif /* __iwl_helpers_h__ */
149
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