1 /******************************************************************************
2 *
3 * Copyright(c) 2003 - 2007 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 * James P. Ketrenos <ipw2100-admin@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 /*
36 * The structures defined by the hardware/uCode interface
37 * have bit-wise operations. For each bit-field there is
38 * a data symbol in the structure, the start bit position
39 * and the length of the bit-field.
40 *
41 * iwl_get_bits and iwl_set_bits will return or set the
42 * appropriate bits on a 32-bit value.
43 *
44 * IWL_GET_BITS and IWL_SET_BITS use symbol expansion to
45 * expand out to the appropriate call to iwl_get_bits
46 * and iwl_set_bits without having to reference all of the
47 * numerical constants and defines provided in the hardware
48 * definition
49 */
50
51 /**
52 * iwl_get_bits - Extract a hardware bit-field value
53 * @src: source hardware value (__le32)
54 * @pos: bit-position (0-based) of first bit of value
55 * @len: length of bit-field
56 *
57 * iwl_get_bits will return the bit-field in cpu endian ordering.
58 *
59 * NOTE: If used from IWL_GET_BITS then pos and len are compile-constants and
60 * will collapse to minimal code by the compiler.
61 */
62 static inline u32 iwl_get_bits(__le32 src, u8 pos, u8 len)
63 {
64 u32 tmp = le32_to_cpu(src);
65
66 tmp >>= pos;
67 tmp &= (1UL << len) - 1;
68 return tmp;
69 }
70
71 /**
72 * iwl_set_bits - Set a hardware bit-field value
73 * @dst: Address of __le32 hardware value
74 * @pos: bit-position (0-based) of first bit of value
75 * @len: length of bit-field
76 * @val: cpu endian value to encode into the bit-field
77 *
78 * iwl_set_bits will encode val into dst, masked to be len bits long at bit
79 * position pos.
80 *
81 * NOTE: If used IWL_SET_BITS pos and len will be compile-constants and
82 * will collapse to minimal code by the compiler.
83 */
84 static inline void iwl_set_bits(__le32 *dst, u8 pos, u8 len, int val)
85 {
86 u32 tmp = le32_to_cpu(*dst);
87
88 tmp &= ~(((1UL << len) - 1) << pos);
89 tmp |= (val & ((1UL << len) - 1)) << pos;
90 *dst = cpu_to_le32(tmp);
91 }
92
93 static inline void iwl_set_bits16(__le16 *dst, u8 pos, u8 len, int val)
94 {
95 u16 tmp = le16_to_cpu(*dst);
96
97 tmp &= ~((1UL << (pos + len)) - (1UL << pos));
98 tmp |= (val & ((1UL << len) - 1)) << pos;
99 *dst = cpu_to_le16(tmp);
100 }
101
102 /*
103 * The bit-field definitions in iwl-xxxx-hw.h are in the form of:
104 *
105 * struct example {
106 * __le32 val1;
107 * #define IWL_name_POS 8
108 * #define IWL_name_LEN 4
109 * #define IWL_name_SYM val1
110 * };
111 *
112 * The IWL_SET_BITS and IWL_GET_BITS macros are provided to allow the driver
113 * to call:
114 *
115 * struct example bar;
116 * u32 val = IWL_GET_BITS(bar, name);
117 * val = val * 2;
118 * IWL_SET_BITS(bar, name, val);
119 *
120 * All cpu / host ordering, masking, and shifts are performed by the macros
121 * and iwl_{get,set}_bits.
122 *
123 */
124 #define IWL_SET_BITS(s, sym, v) \
125 iwl_set_bits(&(s).IWL_ ## sym ## _SYM, IWL_ ## sym ## _POS, \
126 IWL_ ## sym ## _LEN, (v))
127
128 #define IWL_SET_BITS16(s, sym, v) \
129 iwl_set_bits16(&(s).IWL_ ## sym ## _SYM, IWL_ ## sym ## _POS, \
130 IWL_ ## sym ## _LEN, (v))
131
132 #define IWL_GET_BITS(s, sym) \
133 iwl_get_bits((s).IWL_ ## sym ## _SYM, IWL_ ## sym ## _POS, \
134 IWL_ ## sym ## _LEN)
135
136
137 #define KELVIN_TO_CELSIUS(x) ((x)-273)
138 #define CELSIUS_TO_KELVIN(x) ((x)+273)
139
140 #define IEEE80211_CHAN_W_RADAR_DETECT 0x00000010
141
142 static inline struct ieee80211_conf *ieee80211_get_hw_conf(
143 struct ieee80211_hw *hw)
144 {
145 return &hw->conf;
146 }
147
148 #define QOS_CONTROL_LEN 2
149
150
151 static inline int ieee80211_is_management(u16 fc)
152 {
153 return (fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT;
154 }
155
156 static inline int ieee80211_is_control(u16 fc)
157 {
158 return (fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL;
159 }
160
161 static inline int ieee80211_is_data(u16 fc)
162 {
163 return (fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA;
164 }
165
166 static inline int ieee80211_is_back_request(u16 fc)
167 {
168 return ((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL) &&
169 ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BACK_REQ);
170 }
171
172 static inline int ieee80211_is_probe_response(u16 fc)
173 {
174 return ((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT) &&
175 ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP);
176 }
177
178 static inline int ieee80211_is_probe_request(u16 fc)
179 {
180 return ((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT) &&
181 ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_REQ);
182 }
183
184 static inline int ieee80211_is_beacon(u16 fc)
185 {
186 return ((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT) &&
187 ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BEACON);
188 }
189
190 static inline int ieee80211_is_atim(u16 fc)
191 {
192 return ((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT) &&
193 ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_ATIM);
194 }
195
196 static inline int ieee80211_is_assoc_request(u16 fc)
197 {
198 return ((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT) &&
199 ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_ASSOC_REQ);
200 }
201
202 static inline int ieee80211_is_assoc_response(u16 fc)
203 {
204 return ((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT) &&
205 ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_ASSOC_RESP);
206 }
207
208 static inline int ieee80211_is_auth(u16 fc)
209 {
210 return ((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT) &&
211 ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_ASSOC_REQ);
212 }
213
214 static inline int ieee80211_is_deauth(u16 fc)
215 {
216 return ((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT) &&
217 ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_ASSOC_REQ);
218 }
219
220 static inline int ieee80211_is_disassoc(u16 fc)
221 {
222 return ((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT) &&
223 ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_ASSOC_REQ);
224 }
225
226 static inline int ieee80211_is_reassoc_request(u16 fc)
227 {
228 return ((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT) &&
229 ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_REASSOC_REQ);
230 }
231
232 static inline int ieee80211_is_reassoc_response(u16 fc)
233 {
234 return ((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT) &&
235 ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_REASSOC_RESP);
236 }
237
238 static inline int iwl_check_bits(unsigned long field, unsigned long mask)
239 {
240 return ((field & mask) == mask) ? 1 : 0;
241 }
242
243 static inline unsigned long elapsed_jiffies(unsigned long start,
244 unsigned long end)
245 {
246 if (end >= start)
247 return end - start;
248
249 return end + (MAX_JIFFY_OFFSET - start) + 1;
250 }
251
252 static inline u8 iwl_get_dma_hi_address(dma_addr_t addr)
253 {
254 return sizeof(addr) > sizeof(u32) ? (addr >> 16) >> 16 : 0;
255 }
256
257 /* TODO: Move fw_desc functions to iwl-pci.ko */
258 static inline void iwl_free_fw_desc(struct pci_dev *pci_dev,
259 struct fw_desc *desc)
260 {
261 if (desc->v_addr)
262 pci_free_consistent(pci_dev, desc->len,
263 desc->v_addr, desc->p_addr);
264 desc->v_addr = NULL;
265 desc->len = 0;
266 }
267
268 static inline int iwl_alloc_fw_desc(struct pci_dev *pci_dev,
269 struct fw_desc *desc)
270 {
271 desc->v_addr = pci_alloc_consistent(pci_dev, desc->len, &desc->p_addr);
272 return (desc->v_addr != NULL) ? 0 : -ENOMEM;
273 }
274
275 #endif /* __iwl_helpers_h__ */
276
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