1 /******************************************************************************
2 *
3 * Copyright(c) 2003 - 2009 Intel Corporation. All rights reserved.
4 *
5 * Portions of this file are derived from the ipw3945 project.
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of version 2 of the GNU General Public License as
9 * published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * more details.
15 *
16 * You should have received a copy of the GNU General Public License along with
17 * this program; if not, write to the Free Software Foundation, Inc.,
18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
19 *
20 * The full GNU General Public License is included in this distribution in the
21 * file called LICENSE.
22 *
23 * Contact Information:
24 * Intel Linux Wireless <ilw@linux.intel.com>
25 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
26 *
27 *****************************************************************************/
28
29 #ifndef __iwl_io_h__
30 #define __iwl_io_h__
31
32 #include <linux/io.h>
33
34 #include "iwl-debug.h"
35
36 /*
37 * IO, register, and NIC memory access functions
38 *
39 * NOTE on naming convention and macro usage for these
40 *
41 * A single _ prefix before a an access function means that no state
42 * check or debug information is printed when that function is called.
43 *
44 * A double __ prefix before an access function means that state is checked
45 * and the current line number and caller function name are printed in addition
46 * to any other debug output.
47 *
48 * The non-prefixed name is the #define that maps the caller into a
49 * #define that provides the caller's name and __LINE__ to the double
50 * prefix version.
51 *
52 * If you wish to call the function without any debug or state checking,
53 * you should use the single _ prefix version (as is used by dependent IO
54 * routines, for example _iwl_read_direct32 calls the non-check version of
55 * _iwl_read32.)
56 *
57 * These declarations are *extremely* useful in quickly isolating code deltas
58 * which result in misconfiguration of the hardware I/O. In combination with
59 * git-bisect and the IO debug level you can quickly determine the specific
60 * commit which breaks the IO sequence to the hardware.
61 *
62 */
63
64 #define _iwl_write32(priv, ofs, val) iowrite32((val), (priv)->hw_base + (ofs))
65 #ifdef CONFIG_IWLWIFI_DEBUG
66 static inline void __iwl_write32(const char *f, u32 l, struct iwl_priv *priv,
67 u32 ofs, u32 val)
68 {
69 IWL_DEBUG_IO(priv, "write32(0x%08X, 0x%08X) - %s %d\n", ofs, val, f, l);
70 _iwl_write32(priv, ofs, val);
71 }
72 #define iwl_write32(priv, ofs, val) \
73 __iwl_write32(__FILE__, __LINE__, priv, ofs, val)
74 #else
75 #define iwl_write32(priv, ofs, val) _iwl_write32(priv, ofs, val)
76 #endif
77
78 #define _iwl_read32(priv, ofs) ioread32((priv)->hw_base + (ofs))
79 #ifdef CONFIG_IWLWIFI_DEBUG
80 static inline u32 __iwl_read32(char *f, u32 l, struct iwl_priv *priv, u32 ofs)
81 {
82 IWL_DEBUG_IO(priv, "read_direct32(0x%08X) - %s %d\n", ofs, f, l);
83 return _iwl_read32(priv, ofs);
84 }
85 #define iwl_read32(priv, ofs) __iwl_read32(__FILE__, __LINE__, priv, ofs)
86 #else
87 #define iwl_read32(p, o) _iwl_read32(p, o)
88 #endif
89
90 #define IWL_POLL_INTERVAL 10 /* microseconds */
91 static inline int _iwl_poll_bit(struct iwl_priv *priv, u32 addr,
92 u32 bits, u32 mask, int timeout)
93 {
94 int t = 0;
95
96 do {
97 if ((_iwl_read32(priv, addr) & mask) == (bits & mask))
98 return t;
99 udelay(IWL_POLL_INTERVAL);
100 t += IWL_POLL_INTERVAL;
101 } while (t < timeout);
102
103 return -ETIMEDOUT;
104 }
105 #ifdef CONFIG_IWLWIFI_DEBUG
106 static inline int __iwl_poll_bit(const char *f, u32 l,
107 struct iwl_priv *priv, u32 addr,
108 u32 bits, u32 mask, int timeout)
109 {
110 int ret = _iwl_poll_bit(priv, addr, bits, mask, timeout);
111 IWL_DEBUG_IO(priv, "poll_bit(0x%08X, 0x%08X, 0x%08X) - %s- %s %d\n",
112 addr, bits, mask,
113 unlikely(ret == -ETIMEDOUT) ? "timeout" : "", f, l);
114 return ret;
115 }
116 #define iwl_poll_bit(priv, addr, bits, mask, timeout) \
117 __iwl_poll_bit(__FILE__, __LINE__, priv, addr, bits, mask, timeout)
118 #else
119 #define iwl_poll_bit(p, a, b, m, t) _iwl_poll_bit(p, a, b, m, t)
120 #endif
121
122 static inline void _iwl_set_bit(struct iwl_priv *priv, u32 reg, u32 mask)
123 {
124 _iwl_write32(priv, reg, _iwl_read32(priv, reg) | mask);
125 }
126 #ifdef CONFIG_IWLWIFI_DEBUG
127 static inline void __iwl_set_bit(const char *f, u32 l,
128 struct iwl_priv *priv, u32 reg, u32 mask)
129 {
130 u32 val = _iwl_read32(priv, reg) | mask;
131 IWL_DEBUG_IO(priv, "set_bit(0x%08X, 0x%08X) = 0x%08X\n", reg, mask, val);
132 _iwl_write32(priv, reg, val);
133 }
134 static inline void iwl_set_bit(struct iwl_priv *p, u32 r, u32 m)
135 {
136 unsigned long reg_flags;
137
138 spin_lock_irqsave(&p->reg_lock, reg_flags);
139 __iwl_set_bit(__FILE__, __LINE__, p, r, m);
140 spin_unlock_irqrestore(&p->reg_lock, reg_flags);
141 }
142 #else
143 static inline void iwl_set_bit(struct iwl_priv *p, u32 r, u32 m)
144 {
145 unsigned long reg_flags;
146
147 spin_lock_irqsave(&p->reg_lock, reg_flags);
148 _iwl_set_bit(p, r, m);
149 spin_unlock_irqrestore(&p->reg_lock, reg_flags);
150 }
151 #endif
152
153 static inline void _iwl_clear_bit(struct iwl_priv *priv, u32 reg, u32 mask)
154 {
155 _iwl_write32(priv, reg, _iwl_read32(priv, reg) & ~mask);
156 }
157 #ifdef CONFIG_IWLWIFI_DEBUG
158 static inline void __iwl_clear_bit(const char *f, u32 l,
159 struct iwl_priv *priv, u32 reg, u32 mask)
160 {
161 u32 val = _iwl_read32(priv, reg) & ~mask;
162 IWL_DEBUG_IO(priv, "clear_bit(0x%08X, 0x%08X) = 0x%08X\n", reg, mask, val);
163 _iwl_write32(priv, reg, val);
164 }
165 static inline void iwl_clear_bit(struct iwl_priv *p, u32 r, u32 m)
166 {
167 unsigned long reg_flags;
168
169 spin_lock_irqsave(&p->reg_lock, reg_flags);
170 __iwl_clear_bit(__FILE__, __LINE__, p, r, m);
171 spin_unlock_irqrestore(&p->reg_lock, reg_flags);
172 }
173 #else
174 static inline void iwl_clear_bit(struct iwl_priv *p, u32 r, u32 m)
175 {
176 unsigned long reg_flags;
177
178 spin_lock_irqsave(&p->reg_lock, reg_flags);
179 _iwl_clear_bit(p, r, m);
180 spin_unlock_irqrestore(&p->reg_lock, reg_flags);
181 }
182 #endif
183
184 static inline int _iwl_grab_nic_access(struct iwl_priv *priv)
185 {
186 int ret;
187 u32 val;
188
189 /* this bit wakes up the NIC */
190 _iwl_set_bit(priv, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
191 ret = _iwl_poll_bit(priv, CSR_GP_CNTRL,
192 CSR_GP_CNTRL_REG_VAL_MAC_ACCESS_EN,
193 (CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY |
194 CSR_GP_CNTRL_REG_FLAG_GOING_TO_SLEEP), 15000);
195 if (ret < 0) {
196 val = _iwl_read32(priv, CSR_GP_CNTRL);
197 IWL_ERR(priv, "MAC is in deep sleep!. CSR_GP_CNTRL = 0x%08X\n", val);
198 _iwl_write32(priv, CSR_RESET, CSR_RESET_REG_FLAG_FORCE_NMI);
199 return -EIO;
200 }
201
202 return 0;
203 }
204
205 #ifdef CONFIG_IWLWIFI_DEBUG
206 static inline int __iwl_grab_nic_access(const char *f, u32 l,
207 struct iwl_priv *priv)
208 {
209 IWL_DEBUG_IO(priv, "grabbing nic access - %s %d\n", f, l);
210 return _iwl_grab_nic_access(priv);
211 }
212 #define iwl_grab_nic_access(priv) \
213 __iwl_grab_nic_access(__FILE__, __LINE__, priv)
214 #else
215 #define iwl_grab_nic_access(priv) \
216 _iwl_grab_nic_access(priv)
217 #endif
218
219 static inline void _iwl_release_nic_access(struct iwl_priv *priv)
220 {
221 _iwl_clear_bit(priv, CSR_GP_CNTRL,
222 CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
223 }
224 #ifdef CONFIG_IWLWIFI_DEBUG
225 static inline void __iwl_release_nic_access(const char *f, u32 l,
226 struct iwl_priv *priv)
227 {
228
229 IWL_DEBUG_IO(priv, "releasing nic access - %s %d\n", f, l);
230 _iwl_release_nic_access(priv);
231 }
232 #define iwl_release_nic_access(priv) \
233 __iwl_release_nic_access(__FILE__, __LINE__, priv)
234 #else
235 #define iwl_release_nic_access(priv) \
236 _iwl_release_nic_access(priv)
237 #endif
238
239 static inline u32 _iwl_read_direct32(struct iwl_priv *priv, u32 reg)
240 {
241 return _iwl_read32(priv, reg);
242 }
243 #ifdef CONFIG_IWLWIFI_DEBUG
244 static inline u32 __iwl_read_direct32(const char *f, u32 l,
245 struct iwl_priv *priv, u32 reg)
246 {
247 u32 value = _iwl_read_direct32(priv, reg);
248 IWL_DEBUG_IO(priv, "read_direct32(0x%4X) = 0x%08x - %s %d \n", reg, value,
249 f, l);
250 return value;
251 }
252 static inline u32 iwl_read_direct32(struct iwl_priv *priv, u32 reg)
253 {
254 u32 value;
255 unsigned long reg_flags;
256
257 spin_lock_irqsave(&priv->reg_lock, reg_flags);
258 iwl_grab_nic_access(priv);
259 value = __iwl_read_direct32(__FILE__, __LINE__, priv, reg);
260 iwl_release_nic_access(priv);
261 spin_unlock_irqrestore(&priv->reg_lock, reg_flags);
262 return value;
263 }
264
265 #else
266 static inline u32 iwl_read_direct32(struct iwl_priv *priv, u32 reg)
267 {
268 u32 value;
269 unsigned long reg_flags;
270
271 spin_lock_irqsave(&priv->reg_lock, reg_flags);
272 iwl_grab_nic_access(priv);
273 value = _iwl_read_direct32(priv, reg);
274 iwl_release_nic_access(priv);
275 spin_unlock_irqrestore(&priv->reg_lock, reg_flags);
276 return value;
277
278 }
279 #endif
280
281 static inline void _iwl_write_direct32(struct iwl_priv *priv,
282 u32 reg, u32 value)
283 {
284 _iwl_write32(priv, reg, value);
285 }
286 static inline void iwl_write_direct32(struct iwl_priv *priv, u32 reg, u32 value)
287 {
288 unsigned long reg_flags;
289
290 spin_lock_irqsave(&priv->reg_lock, reg_flags);
291 if (!iwl_grab_nic_access(priv)) {
292 _iwl_write_direct32(priv, reg, value);
293 iwl_release_nic_access(priv);
294 }
295 spin_unlock_irqrestore(&priv->reg_lock, reg_flags);
296 }
297
298 static inline void iwl_write_reg_buf(struct iwl_priv *priv,
299 u32 reg, u32 len, u32 *values)
300 {
301 u32 count = sizeof(u32);
302
303 if ((priv != NULL) && (values != NULL)) {
304 for (; 0 < len; len -= count, reg += count, values++)
305 iwl_write_direct32(priv, reg, *values);
306 }
307 }
308
309 static inline int _iwl_poll_direct_bit(struct iwl_priv *priv, u32 addr,
310 u32 mask, int timeout)
311 {
312 int t = 0;
313
314 do {
315 if ((iwl_read_direct32(priv, addr) & mask) == mask)
316 return t;
317 udelay(IWL_POLL_INTERVAL);
318 t += IWL_POLL_INTERVAL;
319 } while (t < timeout);
320
321 return -ETIMEDOUT;
322 }
323
324 #ifdef CONFIG_IWLWIFI_DEBUG
325 static inline int __iwl_poll_direct_bit(const char *f, u32 l,
326 struct iwl_priv *priv,
327 u32 addr, u32 mask, int timeout)
328 {
329 int ret = _iwl_poll_direct_bit(priv, addr, mask, timeout);
330
331 if (unlikely(ret == -ETIMEDOUT))
332 IWL_DEBUG_IO(priv, "poll_direct_bit(0x%08X, 0x%08X) - "
333 "timedout - %s %d\n", addr, mask, f, l);
334 else
335 IWL_DEBUG_IO(priv, "poll_direct_bit(0x%08X, 0x%08X) = 0x%08X "
336 "- %s %d\n", addr, mask, ret, f, l);
337 return ret;
338 }
339 #define iwl_poll_direct_bit(priv, addr, mask, timeout) \
340 __iwl_poll_direct_bit(__FILE__, __LINE__, priv, addr, mask, timeout)
341 #else
342 #define iwl_poll_direct_bit _iwl_poll_direct_bit
343 #endif
344
345 static inline u32 _iwl_read_prph(struct iwl_priv *priv, u32 reg)
346 {
347 _iwl_write_direct32(priv, HBUS_TARG_PRPH_RADDR, reg | (3 << 24));
348 rmb();
349 return _iwl_read_direct32(priv, HBUS_TARG_PRPH_RDAT);
350 }
351 static inline u32 iwl_read_prph(struct iwl_priv *priv, u32 reg)
352 {
353 unsigned long reg_flags;
354 u32 val;
355
356 spin_lock_irqsave(&priv->reg_lock, reg_flags);
357 iwl_grab_nic_access(priv);
358 val = _iwl_read_prph(priv, reg);
359 iwl_release_nic_access(priv);
360 spin_unlock_irqrestore(&priv->reg_lock, reg_flags);
361 return val;
362 }
363
364 static inline void _iwl_write_prph(struct iwl_priv *priv,
365 u32 addr, u32 val)
366 {
367 _iwl_write_direct32(priv, HBUS_TARG_PRPH_WADDR,
368 ((addr & 0x0000FFFF) | (3 << 24)));
369 wmb();
370 _iwl_write_direct32(priv, HBUS_TARG_PRPH_WDAT, val);
371 }
372
373 static inline void iwl_write_prph(struct iwl_priv *priv, u32 addr, u32 val)
374 {
375 unsigned long reg_flags;
376
377 spin_lock_irqsave(&priv->reg_lock, reg_flags);
378 if (!iwl_grab_nic_access(priv)) {
379 _iwl_write_prph(priv, addr, val);
380 iwl_release_nic_access(priv);
381 }
382 spin_unlock_irqrestore(&priv->reg_lock, reg_flags);
383 }
384
385 #define _iwl_set_bits_prph(priv, reg, mask) \
386 _iwl_write_prph(priv, reg, (_iwl_read_prph(priv, reg) | mask))
387
388 static inline void iwl_set_bits_prph(struct iwl_priv *priv, u32 reg, u32 mask)
389 {
390 unsigned long reg_flags;
391
392 spin_lock_irqsave(&priv->reg_lock, reg_flags);
393 iwl_grab_nic_access(priv);
394 _iwl_set_bits_prph(priv, reg, mask);
395 iwl_release_nic_access(priv);
396 spin_unlock_irqrestore(&priv->reg_lock, reg_flags);
397 }
398
399 #define _iwl_set_bits_mask_prph(priv, reg, bits, mask) \
400 _iwl_write_prph(priv, reg, ((_iwl_read_prph(priv, reg) & mask) | bits))
401
402 static inline void iwl_set_bits_mask_prph(struct iwl_priv *priv, u32 reg,
403 u32 bits, u32 mask)
404 {
405 unsigned long reg_flags;
406
407 spin_lock_irqsave(&priv->reg_lock, reg_flags);
408 iwl_grab_nic_access(priv);
409 _iwl_set_bits_mask_prph(priv, reg, bits, mask);
410 iwl_release_nic_access(priv);
411 spin_unlock_irqrestore(&priv->reg_lock, reg_flags);
412 }
413
414 static inline void iwl_clear_bits_prph(struct iwl_priv
415 *priv, u32 reg, u32 mask)
416 {
417 unsigned long reg_flags;
418 u32 val;
419
420 spin_lock_irqsave(&priv->reg_lock, reg_flags);
421 iwl_grab_nic_access(priv);
422 val = _iwl_read_prph(priv, reg);
423 _iwl_write_prph(priv, reg, (val & ~mask));
424 iwl_release_nic_access(priv);
425 spin_unlock_irqrestore(&priv->reg_lock, reg_flags);
426 }
427
428 static inline u32 iwl_read_targ_mem(struct iwl_priv *priv, u32 addr)
429 {
430 unsigned long reg_flags;
431 u32 value;
432
433 spin_lock_irqsave(&priv->reg_lock, reg_flags);
434 iwl_grab_nic_access(priv);
435
436 _iwl_write_direct32(priv, HBUS_TARG_MEM_RADDR, addr);
437 rmb();
438 value = _iwl_read_direct32(priv, HBUS_TARG_MEM_RDAT);
439
440 iwl_release_nic_access(priv);
441 spin_unlock_irqrestore(&priv->reg_lock, reg_flags);
442 return value;
443 }
444
445 static inline void iwl_write_targ_mem(struct iwl_priv *priv, u32 addr, u32 val)
446 {
447 unsigned long reg_flags;
448
449 spin_lock_irqsave(&priv->reg_lock, reg_flags);
450 if (!iwl_grab_nic_access(priv)) {
451 _iwl_write_direct32(priv, HBUS_TARG_MEM_WADDR, addr);
452 wmb();
453 _iwl_write_direct32(priv, HBUS_TARG_MEM_WDAT, val);
454 iwl_release_nic_access(priv);
455 }
456 spin_unlock_irqrestore(&priv->reg_lock, reg_flags);
457 }
458
459 static inline void iwl_write_targ_mem_buf(struct iwl_priv *priv, u32 addr,
460 u32 len, u32 *values)
461 {
462 unsigned long reg_flags;
463
464 spin_lock_irqsave(&priv->reg_lock, reg_flags);
465 if (!iwl_grab_nic_access(priv)) {
466 _iwl_write_direct32(priv, HBUS_TARG_MEM_WADDR, addr);
467 wmb();
468 for (; 0 < len; len -= sizeof(u32), values++)
469 _iwl_write_direct32(priv, HBUS_TARG_MEM_WDAT, *values);
470
471 iwl_release_nic_access(priv);
472 }
473 spin_unlock_irqrestore(&priv->reg_lock, reg_flags);
474 }
475 #endif
476
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