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ath5k: compute rts/cts duration after computing full pktlen
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1 /*-
2  * Copyright (c) 2002-2005 Sam Leffler, Errno Consulting
3  * Copyright (c) 2004-2005 Atheros Communications, Inc.
4  * Copyright (c) 2006 Devicescape Software, Inc.
5  * Copyright (c) 2007 Jiri Slaby <jirislaby@gmail.com>
6  * Copyright (c) 2007 Luis R. Rodriguez <mcgrof@winlab.rutgers.edu>
7  *
8  * All rights reserved.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
13  * 1. Redistributions of source code must retain the above copyright
14  *    notice, this list of conditions and the following disclaimer,
15  *    without modification.
16  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
17  *    similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
18  *    redistribution must be conditioned upon including a substantially
19  *    similar Disclaimer requirement for further binary redistribution.
20  * 3. Neither the names of the above-listed copyright holders nor the names
21  *    of any contributors may be used to endorse or promote products derived
22  *    from this software without specific prior written permission.
23  *
24  * Alternatively, this software may be distributed under the terms of the
25  * GNU General Public License ("GPL") version 2 as published by the Free
26  * Software Foundation.
27  *
28  * NO WARRANTY
29  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
30  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
31  * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
32  * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
33  * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY,
34  * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
35  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
36  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
37  * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
38  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
39  * THE POSSIBILITY OF SUCH DAMAGES.
40  *
41  */
42
43 #include <linux/module.h>
44 #include <linux/delay.h>
45 #include <linux/hardirq.h>
46 #include <linux/if.h>
47 #include <linux/io.h>
48 #include <linux/netdevice.h>
49 #include <linux/cache.h>
50 #include <linux/pci.h>
51 #include <linux/ethtool.h>
52 #include <linux/uaccess.h>
53
54 #include <net/ieee80211_radiotap.h>
55
56 #include <asm/unaligned.h>
57
58 #include "base.h"
59 #include "reg.h"
60 #include "debug.h"
61
62 static int ath5k_calinterval = 10; /* Calibrate PHY every 10 secs (TODO: Fixme) */
63 static int modparam_nohwcrypt;
64 module_param_named(nohwcrypt, modparam_nohwcrypt, int, 0444);
65 MODULE_PARM_DESC(nohwcrypt, "Disable hardware encryption.");
66
67
68 /******************\
69 * Internal defines *
70 \******************/
71
72 /* Module info */
73 MODULE_AUTHOR("Jiri Slaby");
74 MODULE_AUTHOR("Nick Kossifidis");
75 MODULE_DESCRIPTION("Support for 5xxx series of Atheros 802.11 wireless LAN cards.");
76 MODULE_SUPPORTED_DEVICE("Atheros 5xxx WLAN cards");
77 MODULE_LICENSE("Dual BSD/GPL");
78 MODULE_VERSION("0.6.0 (EXPERIMENTAL)");
79
80
81 /* Known PCI ids */
82 static struct pci_device_id ath5k_pci_id_table[] __devinitdata = {
83         { PCI_VDEVICE(ATHEROS, 0x0207), .driver_data = AR5K_AR5210 }, /* 5210 early */
84         { PCI_VDEVICE(ATHEROS, 0x0007), .driver_data = AR5K_AR5210 }, /* 5210 */
85         { PCI_VDEVICE(ATHEROS, 0x0011), .driver_data = AR5K_AR5211 }, /* 5311 - this is on AHB bus !*/
86         { PCI_VDEVICE(ATHEROS, 0x0012), .driver_data = AR5K_AR5211 }, /* 5211 */
87         { PCI_VDEVICE(ATHEROS, 0x0013), .driver_data = AR5K_AR5212 }, /* 5212 */
88         { PCI_VDEVICE(3COM_2,  0x0013), .driver_data = AR5K_AR5212 }, /* 3com 5212 */
89         { PCI_VDEVICE(3COM,    0x0013), .driver_data = AR5K_AR5212 }, /* 3com 3CRDAG675 5212 */
90         { PCI_VDEVICE(ATHEROS, 0x1014), .driver_data = AR5K_AR5212 }, /* IBM minipci 5212 */
91         { PCI_VDEVICE(ATHEROS, 0x0014), .driver_data = AR5K_AR5212 }, /* 5212 combatible */
92         { PCI_VDEVICE(ATHEROS, 0x0015), .driver_data = AR5K_AR5212 }, /* 5212 combatible */
93         { PCI_VDEVICE(ATHEROS, 0x0016), .driver_data = AR5K_AR5212 }, /* 5212 combatible */
94         { PCI_VDEVICE(ATHEROS, 0x0017), .driver_data = AR5K_AR5212 }, /* 5212 combatible */
95         { PCI_VDEVICE(ATHEROS, 0x0018), .driver_data = AR5K_AR5212 }, /* 5212 combatible */
96         { PCI_VDEVICE(ATHEROS, 0x0019), .driver_data = AR5K_AR5212 }, /* 5212 combatible */
97         { PCI_VDEVICE(ATHEROS, 0x001a), .driver_data = AR5K_AR5212 }, /* 2413 Griffin-lite */
98         { PCI_VDEVICE(ATHEROS, 0x001b), .driver_data = AR5K_AR5212 }, /* 5413 Eagle */
99         { PCI_VDEVICE(ATHEROS, 0x001c), .driver_data = AR5K_AR5212 }, /* PCI-E cards */
100         { PCI_VDEVICE(ATHEROS, 0x001d), .driver_data = AR5K_AR5212 }, /* 2417 Nala */
101         { 0 }
102 };
103 MODULE_DEVICE_TABLE(pci, ath5k_pci_id_table);
104
105 /* Known SREVs */
106 static struct ath5k_srev_name srev_names[] = {
107         { "5210",       AR5K_VERSION_MAC,       AR5K_SREV_AR5210 },
108         { "5311",       AR5K_VERSION_MAC,       AR5K_SREV_AR5311 },
109         { "5311A",      AR5K_VERSION_MAC,       AR5K_SREV_AR5311A },
110         { "5311B",      AR5K_VERSION_MAC,       AR5K_SREV_AR5311B },
111         { "5211",       AR5K_VERSION_MAC,       AR5K_SREV_AR5211 },
112         { "5212",       AR5K_VERSION_MAC,       AR5K_SREV_AR5212 },
113         { "5213",       AR5K_VERSION_MAC,       AR5K_SREV_AR5213 },
114         { "5213A",      AR5K_VERSION_MAC,       AR5K_SREV_AR5213A },
115         { "2413",       AR5K_VERSION_MAC,       AR5K_SREV_AR2413 },
116         { "2414",       AR5K_VERSION_MAC,       AR5K_SREV_AR2414 },
117         { "5424",       AR5K_VERSION_MAC,       AR5K_SREV_AR5424 },
118         { "5413",       AR5K_VERSION_MAC,       AR5K_SREV_AR5413 },
119         { "5414",       AR5K_VERSION_MAC,       AR5K_SREV_AR5414 },
120         { "2415",       AR5K_VERSION_MAC,       AR5K_SREV_AR2415 },
121         { "5416",       AR5K_VERSION_MAC,       AR5K_SREV_AR5416 },
122         { "5418",       AR5K_VERSION_MAC,       AR5K_SREV_AR5418 },
123         { "2425",       AR5K_VERSION_MAC,       AR5K_SREV_AR2425 },
124         { "2417",       AR5K_VERSION_MAC,       AR5K_SREV_AR2417 },
125         { "xxxxx",      AR5K_VERSION_MAC,       AR5K_SREV_UNKNOWN },
126         { "5110",       AR5K_VERSION_RAD,       AR5K_SREV_RAD_5110 },
127         { "5111",       AR5K_VERSION_RAD,       AR5K_SREV_RAD_5111 },
128         { "5111A",      AR5K_VERSION_RAD,       AR5K_SREV_RAD_5111A },
129         { "2111",       AR5K_VERSION_RAD,       AR5K_SREV_RAD_2111 },
130         { "5112",       AR5K_VERSION_RAD,       AR5K_SREV_RAD_5112 },
131         { "5112A",      AR5K_VERSION_RAD,       AR5K_SREV_RAD_5112A },
132         { "5112B",      AR5K_VERSION_RAD,       AR5K_SREV_RAD_5112B },
133         { "2112",       AR5K_VERSION_RAD,       AR5K_SREV_RAD_2112 },
134         { "2112A",      AR5K_VERSION_RAD,       AR5K_SREV_RAD_2112A },
135         { "2112B",      AR5K_VERSION_RAD,       AR5K_SREV_RAD_2112B },
136         { "2413",       AR5K_VERSION_RAD,       AR5K_SREV_RAD_2413 },
137         { "5413",       AR5K_VERSION_RAD,       AR5K_SREV_RAD_5413 },
138         { "2316",       AR5K_VERSION_RAD,       AR5K_SREV_RAD_2316 },
139         { "2317",       AR5K_VERSION_RAD,       AR5K_SREV_RAD_2317 },
140         { "5424",       AR5K_VERSION_RAD,       AR5K_SREV_RAD_5424 },
141         { "5133",       AR5K_VERSION_RAD,       AR5K_SREV_RAD_5133 },
142         { "xxxxx",      AR5K_VERSION_RAD,       AR5K_SREV_UNKNOWN },
143 };
144
145 static struct ieee80211_rate ath5k_rates[] = {
146         { .bitrate = 10,
147           .hw_value = ATH5K_RATE_CODE_1M, },
148         { .bitrate = 20,
149           .hw_value = ATH5K_RATE_CODE_2M,
150           .hw_value_short = ATH5K_RATE_CODE_2M | AR5K_SET_SHORT_PREAMBLE,
151           .flags = IEEE80211_RATE_SHORT_PREAMBLE },
152         { .bitrate = 55,
153           .hw_value = ATH5K_RATE_CODE_5_5M,
154           .hw_value_short = ATH5K_RATE_CODE_5_5M | AR5K_SET_SHORT_PREAMBLE,
155           .flags = IEEE80211_RATE_SHORT_PREAMBLE },
156         { .bitrate = 110,
157           .hw_value = ATH5K_RATE_CODE_11M,
158           .hw_value_short = ATH5K_RATE_CODE_11M | AR5K_SET_SHORT_PREAMBLE,
159           .flags = IEEE80211_RATE_SHORT_PREAMBLE },
160         { .bitrate = 60,
161           .hw_value = ATH5K_RATE_CODE_6M,
162           .flags = 0 },
163         { .bitrate = 90,
164           .hw_value = ATH5K_RATE_CODE_9M,
165           .flags = 0 },
166         { .bitrate = 120,
167           .hw_value = ATH5K_RATE_CODE_12M,
168           .flags = 0 },
169         { .bitrate = 180,
170           .hw_value = ATH5K_RATE_CODE_18M,
171           .flags = 0 },
172         { .bitrate = 240,
173           .hw_value = ATH5K_RATE_CODE_24M,
174           .flags = 0 },
175         { .bitrate = 360,
176           .hw_value = ATH5K_RATE_CODE_36M,
177           .flags = 0 },
178         { .bitrate = 480,
179           .hw_value = ATH5K_RATE_CODE_48M,
180           .flags = 0 },
181         { .bitrate = 540,
182           .hw_value = ATH5K_RATE_CODE_54M,
183           .flags = 0 },
184         /* XR missing */
185 };
186
187 /*
188  * Prototypes - PCI stack related functions
189  */
190 static int __devinit    ath5k_pci_probe(struct pci_dev *pdev,
191                                 const struct pci_device_id *id);
192 static void __devexit   ath5k_pci_remove(struct pci_dev *pdev);
193 #ifdef CONFIG_PM
194 static int              ath5k_pci_suspend(struct pci_dev *pdev,
195                                         pm_message_t state);
196 static int              ath5k_pci_resume(struct pci_dev *pdev);
197 #else
198 #define ath5k_pci_suspend NULL
199 #define ath5k_pci_resume NULL
200 #endif /* CONFIG_PM */
201
202 static struct pci_driver ath5k_pci_driver = {
203         .name           = KBUILD_MODNAME,
204         .id_table       = ath5k_pci_id_table,
205         .probe          = ath5k_pci_probe,
206         .remove         = __devexit_p(ath5k_pci_remove),
207         .suspend        = ath5k_pci_suspend,
208         .resume         = ath5k_pci_resume,
209 };
210
211
212
213 /*
214  * Prototypes - MAC 802.11 stack related functions
215  */
216 static int ath5k_tx(struct ieee80211_hw *hw, struct sk_buff *skb);
217 static int ath5k_reset(struct ath5k_softc *sc, bool stop, bool change_channel);
218 static int ath5k_reset_wake(struct ath5k_softc *sc);
219 static int ath5k_start(struct ieee80211_hw *hw);
220 static void ath5k_stop(struct ieee80211_hw *hw);
221 static int ath5k_add_interface(struct ieee80211_hw *hw,
222                 struct ieee80211_if_init_conf *conf);
223 static void ath5k_remove_interface(struct ieee80211_hw *hw,
224                 struct ieee80211_if_init_conf *conf);
225 static int ath5k_config(struct ieee80211_hw *hw, u32 changed);
226 static int ath5k_config_interface(struct ieee80211_hw *hw,
227                 struct ieee80211_vif *vif,
228                 struct ieee80211_if_conf *conf);
229 static void ath5k_configure_filter(struct ieee80211_hw *hw,
230                 unsigned int changed_flags,
231                 unsigned int *new_flags,
232                 int mc_count, struct dev_mc_list *mclist);
233 static int ath5k_set_key(struct ieee80211_hw *hw,
234                 enum set_key_cmd cmd,
235                 struct ieee80211_vif *vif, struct ieee80211_sta *sta,
236                 struct ieee80211_key_conf *key);
237 static int ath5k_get_stats(struct ieee80211_hw *hw,
238                 struct ieee80211_low_level_stats *stats);
239 static int ath5k_get_tx_stats(struct ieee80211_hw *hw,
240                 struct ieee80211_tx_queue_stats *stats);
241 static u64 ath5k_get_tsf(struct ieee80211_hw *hw);
242 static void ath5k_set_tsf(struct ieee80211_hw *hw, u64 tsf);
243 static void ath5k_reset_tsf(struct ieee80211_hw *hw);
244 static int ath5k_beacon_update(struct ath5k_softc *sc,
245                 struct sk_buff *skb);
246 static void ath5k_bss_info_changed(struct ieee80211_hw *hw,
247                 struct ieee80211_vif *vif,
248                 struct ieee80211_bss_conf *bss_conf,
249                 u32 changes);
250
251 static struct ieee80211_ops ath5k_hw_ops = {
252         .tx             = ath5k_tx,
253         .start          = ath5k_start,
254         .stop           = ath5k_stop,
255         .add_interface  = ath5k_add_interface,
256         .remove_interface = ath5k_remove_interface,
257         .config         = ath5k_config,
258         .config_interface = ath5k_config_interface,
259         .configure_filter = ath5k_configure_filter,
260         .set_key        = ath5k_set_key,
261         .get_stats      = ath5k_get_stats,
262         .conf_tx        = NULL,
263         .get_tx_stats   = ath5k_get_tx_stats,
264         .get_tsf        = ath5k_get_tsf,
265         .set_tsf        = ath5k_set_tsf,
266         .reset_tsf      = ath5k_reset_tsf,
267         .bss_info_changed = ath5k_bss_info_changed,
268 };
269
270 /*
271  * Prototypes - Internal functions
272  */
273 /* Attach detach */
274 static int      ath5k_attach(struct pci_dev *pdev,
275                         struct ieee80211_hw *hw);
276 static void     ath5k_detach(struct pci_dev *pdev,
277                         struct ieee80211_hw *hw);
278 /* Channel/mode setup */
279 static inline short ath5k_ieee2mhz(short chan);
280 static unsigned int ath5k_copy_channels(struct ath5k_hw *ah,
281                                 struct ieee80211_channel *channels,
282                                 unsigned int mode,
283                                 unsigned int max);
284 static int      ath5k_setup_bands(struct ieee80211_hw *hw);
285 static int      ath5k_chan_set(struct ath5k_softc *sc,
286                                 struct ieee80211_channel *chan);
287 static void     ath5k_setcurmode(struct ath5k_softc *sc,
288                                 unsigned int mode);
289 static void     ath5k_mode_setup(struct ath5k_softc *sc);
290
291 /* Descriptor setup */
292 static int      ath5k_desc_alloc(struct ath5k_softc *sc,
293                                 struct pci_dev *pdev);
294 static void     ath5k_desc_free(struct ath5k_softc *sc,
295                                 struct pci_dev *pdev);
296 /* Buffers setup */
297 static int      ath5k_rxbuf_setup(struct ath5k_softc *sc,
298                                 struct ath5k_buf *bf);
299 static int      ath5k_txbuf_setup(struct ath5k_softc *sc,
300                                 struct ath5k_buf *bf);
301 static inline void ath5k_txbuf_free(struct ath5k_softc *sc,
302                                 struct ath5k_buf *bf)
303 {
304         BUG_ON(!bf);
305         if (!bf->skb)
306                 return;
307         pci_unmap_single(sc->pdev, bf->skbaddr, bf->skb->len,
308                         PCI_DMA_TODEVICE);
309         dev_kfree_skb_any(bf->skb);
310         bf->skb = NULL;
311 }
312
313 static inline void ath5k_rxbuf_free(struct ath5k_softc *sc,
314                                 struct ath5k_buf *bf)
315 {
316         BUG_ON(!bf);
317         if (!bf->skb)
318                 return;
319         pci_unmap_single(sc->pdev, bf->skbaddr, sc->rxbufsize,
320                         PCI_DMA_FROMDEVICE);
321         dev_kfree_skb_any(bf->skb);
322         bf->skb = NULL;
323 }
324
325
326 /* Queues setup */
327 static struct   ath5k_txq *ath5k_txq_setup(struct ath5k_softc *sc,
328                                 int qtype, int subtype);
329 static int      ath5k_beaconq_setup(struct ath5k_hw *ah);
330 static int      ath5k_beaconq_config(struct ath5k_softc *sc);
331 static void     ath5k_txq_drainq(struct ath5k_softc *sc,
332                                 struct ath5k_txq *txq);
333 static void     ath5k_txq_cleanup(struct ath5k_softc *sc);
334 static void     ath5k_txq_release(struct ath5k_softc *sc);
335 /* Rx handling */
336 static int      ath5k_rx_start(struct ath5k_softc *sc);
337 static void     ath5k_rx_stop(struct ath5k_softc *sc);
338 static unsigned int ath5k_rx_decrypted(struct ath5k_softc *sc,
339                                         struct ath5k_desc *ds,
340                                         struct sk_buff *skb,
341                                         struct ath5k_rx_status *rs);
342 static void     ath5k_tasklet_rx(unsigned long data);
343 /* Tx handling */
344 static void     ath5k_tx_processq(struct ath5k_softc *sc,
345                                 struct ath5k_txq *txq);
346 static void     ath5k_tasklet_tx(unsigned long data);
347 /* Beacon handling */
348 static int      ath5k_beacon_setup(struct ath5k_softc *sc,
349                                         struct ath5k_buf *bf);
350 static void     ath5k_beacon_send(struct ath5k_softc *sc);
351 static void     ath5k_beacon_config(struct ath5k_softc *sc);
352 static void     ath5k_beacon_update_timers(struct ath5k_softc *sc, u64 bc_tsf);
353 static void     ath5k_tasklet_beacon(unsigned long data);
354
355 static inline u64 ath5k_extend_tsf(struct ath5k_hw *ah, u32 rstamp)
356 {
357         u64 tsf = ath5k_hw_get_tsf64(ah);
358
359         if ((tsf & 0x7fff) < rstamp)
360                 tsf -= 0x8000;
361
362         return (tsf & ~0x7fff) | rstamp;
363 }
364
365 /* Interrupt handling */
366 static int      ath5k_init(struct ath5k_softc *sc);
367 static int      ath5k_stop_locked(struct ath5k_softc *sc);
368 static int      ath5k_stop_hw(struct ath5k_softc *sc);
369 static irqreturn_t ath5k_intr(int irq, void *dev_id);
370 static void     ath5k_tasklet_reset(unsigned long data);
371
372 static void     ath5k_calibrate(unsigned long data);
373 /* LED functions */
374 static int      ath5k_init_leds(struct ath5k_softc *sc);
375 static void     ath5k_led_enable(struct ath5k_softc *sc);
376 static void     ath5k_led_off(struct ath5k_softc *sc);
377 static void     ath5k_unregister_leds(struct ath5k_softc *sc);
378
379 /*
380  * Module init/exit functions
381  */
382 static int __init
383 init_ath5k_pci(void)
384 {
385         int ret;
386
387         ath5k_debug_init();
388
389         ret = pci_register_driver(&ath5k_pci_driver);
390         if (ret) {
391                 printk(KERN_ERR "ath5k_pci: can't register pci driver\n");
392                 return ret;
393         }
394
395         return 0;
396 }
397
398 static void __exit
399 exit_ath5k_pci(void)
400 {
401         pci_unregister_driver(&ath5k_pci_driver);
402
403         ath5k_debug_finish();
404 }
405
406 module_init(init_ath5k_pci);
407 module_exit(exit_ath5k_pci);
408
409
410 /********************\
411 * PCI Initialization *
412 \********************/
413
414 static const char *
415 ath5k_chip_name(enum ath5k_srev_type type, u_int16_t val)
416 {
417         const char *name = "xxxxx";
418         unsigned int i;
419
420         for (i = 0; i < ARRAY_SIZE(srev_names); i++) {
421                 if (srev_names[i].sr_type != type)
422                         continue;
423
424                 if ((val & 0xf0) == srev_names[i].sr_val)
425                         name = srev_names[i].sr_name;
426
427                 if ((val & 0xff) == srev_names[i].sr_val) {
428                         name = srev_names[i].sr_name;
429                         break;
430                 }
431         }
432
433         return name;
434 }
435
436 static int __devinit
437 ath5k_pci_probe(struct pci_dev *pdev,
438                 const struct pci_device_id *id)
439 {
440         void __iomem *mem;
441         struct ath5k_softc *sc;
442         struct ieee80211_hw *hw;
443         int ret;
444         u8 csz;
445
446         ret = pci_enable_device(pdev);
447         if (ret) {
448                 dev_err(&pdev->dev, "can't enable device\n");
449                 goto err;
450         }
451
452         /* XXX 32-bit addressing only */
453         ret = pci_set_dma_mask(pdev, DMA_32BIT_MASK);
454         if (ret) {
455                 dev_err(&pdev->dev, "32-bit DMA not available\n");
456                 goto err_dis;
457         }
458
459         /*
460          * Cache line size is used to size and align various
461          * structures used to communicate with the hardware.
462          */
463         pci_read_config_byte(pdev, PCI_CACHE_LINE_SIZE, &csz);
464         if (csz == 0) {
465                 /*
466                  * Linux 2.4.18 (at least) writes the cache line size
467                  * register as a 16-bit wide register which is wrong.
468                  * We must have this setup properly for rx buffer
469                  * DMA to work so force a reasonable value here if it
470                  * comes up zero.
471                  */
472                 csz = L1_CACHE_BYTES / sizeof(u32);
473                 pci_write_config_byte(pdev, PCI_CACHE_LINE_SIZE, csz);
474         }
475         /*
476          * The default setting of latency timer yields poor results,
477          * set it to the value used by other systems.  It may be worth
478          * tweaking this setting more.
479          */
480         pci_write_config_byte(pdev, PCI_LATENCY_TIMER, 0xa8);
481
482         /* Enable bus mastering */
483         pci_set_master(pdev);
484
485         /*
486          * Disable the RETRY_TIMEOUT register (0x41) to keep
487          * PCI Tx retries from interfering with C3 CPU state.
488          */
489         pci_write_config_byte(pdev, 0x41, 0);
490
491         ret = pci_request_region(pdev, 0, "ath5k");
492         if (ret) {
493                 dev_err(&pdev->dev, "cannot reserve PCI memory region\n");
494                 goto err_dis;
495         }
496
497         mem = pci_iomap(pdev, 0, 0);
498         if (!mem) {
499                 dev_err(&pdev->dev, "cannot remap PCI memory region\n") ;
500                 ret = -EIO;
501                 goto err_reg;
502         }
503
504         /*
505          * Allocate hw (mac80211 main struct)
506          * and hw->priv (driver private data)
507          */
508         hw = ieee80211_alloc_hw(sizeof(*sc), &ath5k_hw_ops);
509         if (hw == NULL) {
510                 dev_err(&pdev->dev, "cannot allocate ieee80211_hw\n");
511                 ret = -ENOMEM;
512                 goto err_map;
513         }
514
515         dev_info(&pdev->dev, "registered as '%s'\n", wiphy_name(hw->wiphy));
516
517         /* Initialize driver private data */
518         SET_IEEE80211_DEV(hw, &pdev->dev);
519         hw->flags = IEEE80211_HW_RX_INCLUDES_FCS |
520                     IEEE80211_HW_SIGNAL_DBM |
521                     IEEE80211_HW_NOISE_DBM;
522
523         hw->wiphy->interface_modes =
524                 BIT(NL80211_IFTYPE_STATION) |
525                 BIT(NL80211_IFTYPE_ADHOC) |
526                 BIT(NL80211_IFTYPE_MESH_POINT);
527
528         hw->extra_tx_headroom = 2;
529         hw->channel_change_time = 5000;
530         sc = hw->priv;
531         sc->hw = hw;
532         sc->pdev = pdev;
533
534         ath5k_debug_init_device(sc);
535
536         /*
537          * Mark the device as detached to avoid processing
538          * interrupts until setup is complete.
539          */
540         __set_bit(ATH_STAT_INVALID, sc->status);
541
542         sc->iobase = mem; /* So we can unmap it on detach */
543         sc->cachelsz = csz * sizeof(u32); /* convert to bytes */
544         sc->opmode = NL80211_IFTYPE_STATION;
545         mutex_init(&sc->lock);
546         spin_lock_init(&sc->rxbuflock);
547         spin_lock_init(&sc->txbuflock);
548         spin_lock_init(&sc->block);
549
550         /* Set private data */
551         pci_set_drvdata(pdev, hw);
552
553         /* Setup interrupt handler */
554         ret = request_irq(pdev->irq, ath5k_intr, IRQF_SHARED, "ath", sc);
555         if (ret) {
556                 ATH5K_ERR(sc, "request_irq failed\n");
557                 goto err_free;
558         }
559
560         /* Initialize device */
561         sc->ah = ath5k_hw_attach(sc, id->driver_data);
562         if (IS_ERR(sc->ah)) {
563                 ret = PTR_ERR(sc->ah);
564                 goto err_irq;
565         }
566
567         /* set up multi-rate retry capabilities */
568         if (sc->ah->ah_version == AR5K_AR5212) {
569                 hw->max_rates = 4;
570                 hw->max_rate_tries = 11;
571         }
572
573         /* Finish private driver data initialization */
574         ret = ath5k_attach(pdev, hw);
575         if (ret)
576                 goto err_ah;
577
578         ATH5K_INFO(sc, "Atheros AR%s chip found (MAC: 0x%x, PHY: 0x%x)\n",
579                         ath5k_chip_name(AR5K_VERSION_MAC, sc->ah->ah_mac_srev),
580                                         sc->ah->ah_mac_srev,
581                                         sc->ah->ah_phy_revision);
582
583         if (!sc->ah->ah_single_chip) {
584                 /* Single chip radio (!RF5111) */
585                 if (sc->ah->ah_radio_5ghz_revision &&
586                         !sc->ah->ah_radio_2ghz_revision) {
587                         /* No 5GHz support -> report 2GHz radio */
588                         if (!test_bit(AR5K_MODE_11A,
589                                 sc->ah->ah_capabilities.cap_mode)) {
590                                 ATH5K_INFO(sc, "RF%s 2GHz radio found (0x%x)\n",
591                                         ath5k_chip_name(AR5K_VERSION_RAD,
592                                                 sc->ah->ah_radio_5ghz_revision),
593                                                 sc->ah->ah_radio_5ghz_revision);
594                         /* No 2GHz support (5110 and some
595                          * 5Ghz only cards) -> report 5Ghz radio */
596                         } else if (!test_bit(AR5K_MODE_11B,
597                                 sc->ah->ah_capabilities.cap_mode)) {
598                                 ATH5K_INFO(sc, "RF%s 5GHz radio found (0x%x)\n",
599                                         ath5k_chip_name(AR5K_VERSION_RAD,
600                                                 sc->ah->ah_radio_5ghz_revision),
601                                                 sc->ah->ah_radio_5ghz_revision);
602                         /* Multiband radio */
603                         } else {
604                                 ATH5K_INFO(sc, "RF%s multiband radio found"
605                                         " (0x%x)\n",
606                                         ath5k_chip_name(AR5K_VERSION_RAD,
607                                                 sc->ah->ah_radio_5ghz_revision),
608                                                 sc->ah->ah_radio_5ghz_revision);
609                         }
610                 }
611                 /* Multi chip radio (RF5111 - RF2111) ->
612                  * report both 2GHz/5GHz radios */
613                 else if (sc->ah->ah_radio_5ghz_revision &&
614                                 sc->ah->ah_radio_2ghz_revision){
615                         ATH5K_INFO(sc, "RF%s 5GHz radio found (0x%x)\n",
616                                 ath5k_chip_name(AR5K_VERSION_RAD,
617                                         sc->ah->ah_radio_5ghz_revision),
618                                         sc->ah->ah_radio_5ghz_revision);
619                         ATH5K_INFO(sc, "RF%s 2GHz radio found (0x%x)\n",
620                                 ath5k_chip_name(AR5K_VERSION_RAD,
621                                         sc->ah->ah_radio_2ghz_revision),
622                                         sc->ah->ah_radio_2ghz_revision);
623                 }
624         }
625
626
627         /* ready to process interrupts */
628         __clear_bit(ATH_STAT_INVALID, sc->status);
629
630         return 0;
631 err_ah:
632         ath5k_hw_detach(sc->ah);
633 err_irq:
634         free_irq(pdev->irq, sc);
635 err_free:
636         ieee80211_free_hw(hw);
637 err_map:
638         pci_iounmap(pdev, mem);
639 err_reg:
640         pci_release_region(pdev, 0);
641 err_dis:
642         pci_disable_device(pdev);
643 err:
644         return ret;
645 }
646
647 static void __devexit
648 ath5k_pci_remove(struct pci_dev *pdev)
649 {
650         struct ieee80211_hw *hw = pci_get_drvdata(pdev);
651         struct ath5k_softc *sc = hw->priv;
652
653         ath5k_debug_finish_device(sc);
654         ath5k_detach(pdev, hw);
655         ath5k_hw_detach(sc->ah);
656         free_irq(pdev->irq, sc);
657         pci_iounmap(pdev, sc->iobase);
658         pci_release_region(pdev, 0);
659         pci_disable_device(pdev);
660         ieee80211_free_hw(hw);
661 }
662
663 #ifdef CONFIG_PM
664 static int
665 ath5k_pci_suspend(struct pci_dev *pdev, pm_message_t state)
666 {
667         struct ieee80211_hw *hw = pci_get_drvdata(pdev);
668         struct ath5k_softc *sc = hw->priv;
669
670         ath5k_led_off(sc);
671
672         free_irq(pdev->irq, sc);
673         pci_save_state(pdev);
674         pci_disable_device(pdev);
675         pci_set_power_state(pdev, PCI_D3hot);
676
677         return 0;
678 }
679
680 static int
681 ath5k_pci_resume(struct pci_dev *pdev)
682 {
683         struct ieee80211_hw *hw = pci_get_drvdata(pdev);
684         struct ath5k_softc *sc = hw->priv;
685         int err;
686
687         pci_restore_state(pdev);
688
689         err = pci_enable_device(pdev);
690         if (err)
691                 return err;
692
693         /*
694          * Suspend/Resume resets the PCI configuration space, so we have to
695          * re-disable the RETRY_TIMEOUT register (0x41) to keep
696          * PCI Tx retries from interfering with C3 CPU state
697          */
698         pci_write_config_byte(pdev, 0x41, 0);
699
700         err = request_irq(pdev->irq, ath5k_intr, IRQF_SHARED, "ath", sc);
701         if (err) {
702                 ATH5K_ERR(sc, "request_irq failed\n");
703                 goto err_no_irq;
704         }
705
706         ath5k_led_enable(sc);
707         return 0;
708
709 err_no_irq:
710         pci_disable_device(pdev);
711         return err;
712 }
713 #endif /* CONFIG_PM */
714
715
716 /***********************\
717 * Driver Initialization *
718 \***********************/
719
720 static int
721 ath5k_attach(struct pci_dev *pdev, struct ieee80211_hw *hw)
722 {
723         struct ath5k_softc *sc = hw->priv;
724         struct ath5k_hw *ah = sc->ah;
725         u8 mac[ETH_ALEN] = {};
726         int ret;
727
728         ATH5K_DBG(sc, ATH5K_DEBUG_ANY, "devid 0x%x\n", pdev->device);
729
730         /*
731          * Check if the MAC has multi-rate retry support.
732          * We do this by trying to setup a fake extended
733          * descriptor.  MAC's that don't have support will
734          * return false w/o doing anything.  MAC's that do
735          * support it will return true w/o doing anything.
736          */
737         ret = ah->ah_setup_mrr_tx_desc(ah, NULL, 0, 0, 0, 0, 0, 0);
738         if (ret < 0)
739                 goto err;
740         if (ret > 0)
741                 __set_bit(ATH_STAT_MRRETRY, sc->status);
742
743         /*
744          * Collect the channel list.  The 802.11 layer
745          * is resposible for filtering this list based
746          * on settings like the phy mode and regulatory
747          * domain restrictions.
748          */
749         ret = ath5k_setup_bands(hw);
750         if (ret) {
751                 ATH5K_ERR(sc, "can't get channels\n");
752                 goto err;
753         }
754
755         /* NB: setup here so ath5k_rate_update is happy */
756         if (test_bit(AR5K_MODE_11A, ah->ah_modes))
757                 ath5k_setcurmode(sc, AR5K_MODE_11A);
758         else
759                 ath5k_setcurmode(sc, AR5K_MODE_11B);
760
761         /*
762          * Allocate tx+rx descriptors and populate the lists.
763          */
764         ret = ath5k_desc_alloc(sc, pdev);
765         if (ret) {
766                 ATH5K_ERR(sc, "can't allocate descriptors\n");
767                 goto err;
768         }
769
770         /*
771          * Allocate hardware transmit queues: one queue for
772          * beacon frames and one data queue for each QoS
773          * priority.  Note that hw functions handle reseting
774          * these queues at the needed time.
775          */
776         ret = ath5k_beaconq_setup(ah);
777         if (ret < 0) {
778                 ATH5K_ERR(sc, "can't setup a beacon xmit queue\n");
779                 goto err_desc;
780         }
781         sc->bhalq = ret;
782
783         sc->txq = ath5k_txq_setup(sc, AR5K_TX_QUEUE_DATA, AR5K_WME_AC_BK);
784         if (IS_ERR(sc->txq)) {
785                 ATH5K_ERR(sc, "can't setup xmit queue\n");
786                 ret = PTR_ERR(sc->txq);
787                 goto err_bhal;
788         }
789
790         tasklet_init(&sc->rxtq, ath5k_tasklet_rx, (unsigned long)sc);
791         tasklet_init(&sc->txtq, ath5k_tasklet_tx, (unsigned long)sc);
792         tasklet_init(&sc->restq, ath5k_tasklet_reset, (unsigned long)sc);
793         tasklet_init(&sc->beacontq, ath5k_tasklet_beacon, (unsigned long)sc);
794         setup_timer(&sc->calib_tim, ath5k_calibrate, (unsigned long)sc);
795
796         ret = ath5k_eeprom_read_mac(ah, mac);
797         if (ret) {
798                 ATH5K_ERR(sc, "unable to read address from EEPROM: 0x%04x\n",
799                         sc->pdev->device);
800                 goto err_queues;
801         }
802
803         SET_IEEE80211_PERM_ADDR(hw, mac);
804         /* All MAC address bits matter for ACKs */
805         memset(sc->bssidmask, 0xff, ETH_ALEN);
806         ath5k_hw_set_bssid_mask(sc->ah, sc->bssidmask);
807
808         ret = ieee80211_register_hw(hw);
809         if (ret) {
810                 ATH5K_ERR(sc, "can't register ieee80211 hw\n");
811                 goto err_queues;
812         }
813
814         ath5k_init_leds(sc);
815
816         return 0;
817 err_queues:
818         ath5k_txq_release(sc);
819 err_bhal:
820         ath5k_hw_release_tx_queue(ah, sc->bhalq);
821 err_desc:
822         ath5k_desc_free(sc, pdev);
823 err:
824         return ret;
825 }
826
827 static void
828 ath5k_detach(struct pci_dev *pdev, struct ieee80211_hw *hw)
829 {
830         struct ath5k_softc *sc = hw->priv;
831
832         /*
833          * NB: the order of these is important:
834          * o call the 802.11 layer before detaching ath5k_hw to
835          *   insure callbacks into the driver to delete global
836          *   key cache entries can be handled
837          * o reclaim the tx queue data structures after calling
838          *   the 802.11 layer as we'll get called back to reclaim
839          *   node state and potentially want to use them
840          * o to cleanup the tx queues the hal is called, so detach
841          *   it last
842          * XXX: ??? detach ath5k_hw ???
843          * Other than that, it's straightforward...
844          */
845         ieee80211_unregister_hw(hw);
846         ath5k_desc_free(sc, pdev);
847         ath5k_txq_release(sc);
848         ath5k_hw_release_tx_queue(sc->ah, sc->bhalq);
849         ath5k_unregister_leds(sc);
850
851         /*
852          * NB: can't reclaim these until after ieee80211_ifdetach
853          * returns because we'll get called back to reclaim node
854          * state and potentially want to use them.
855          */
856 }
857
858
859
860
861 /********************\
862 * Channel/mode setup *
863 \********************/
864
865 /*
866  * Convert IEEE channel number to MHz frequency.
867  */
868 static inline short
869 ath5k_ieee2mhz(short chan)
870 {
871         if (chan <= 14 || chan >= 27)
872                 return ieee80211chan2mhz(chan);
873         else
874                 return 2212 + chan * 20;
875 }
876
877 static unsigned int
878 ath5k_copy_channels(struct ath5k_hw *ah,
879                 struct ieee80211_channel *channels,
880                 unsigned int mode,
881                 unsigned int max)
882 {
883         unsigned int i, count, size, chfreq, freq, ch;
884
885         if (!test_bit(mode, ah->ah_modes))
886                 return 0;
887
888         switch (mode) {
889         case AR5K_MODE_11A:
890         case AR5K_MODE_11A_TURBO:
891                 /* 1..220, but 2GHz frequencies are filtered by check_channel */
892                 size = 220 ;
893                 chfreq = CHANNEL_5GHZ;
894                 break;
895         case AR5K_MODE_11B:
896         case AR5K_MODE_11G:
897         case AR5K_MODE_11G_TURBO:
898                 size = 26;
899                 chfreq = CHANNEL_2GHZ;
900                 break;
901         default:
902                 ATH5K_WARN(ah->ah_sc, "bad mode, not copying channels\n");
903                 return 0;
904         }
905
906         for (i = 0, count = 0; i < size && max > 0; i++) {
907                 ch = i + 1 ;
908                 freq = ath5k_ieee2mhz(ch);
909
910                 /* Check if channel is supported by the chipset */
911                 if (!ath5k_channel_ok(ah, freq, chfreq))
912                         continue;
913
914                 /* Write channel info and increment counter */
915                 channels[count].center_freq = freq;
916                 channels[count].band = (chfreq == CHANNEL_2GHZ) ?
917                         IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
918                 switch (mode) {
919                 case AR5K_MODE_11A:
920                 case AR5K_MODE_11G:
921                         channels[count].hw_value = chfreq | CHANNEL_OFDM;
922                         break;
923                 case AR5K_MODE_11A_TURBO:
924                 case AR5K_MODE_11G_TURBO:
925                         channels[count].hw_value = chfreq |
926                                 CHANNEL_OFDM | CHANNEL_TURBO;
927                         break;
928                 case AR5K_MODE_11B:
929                         channels[count].hw_value = CHANNEL_B;
930                 }
931
932                 count++;
933                 max--;
934         }
935
936         return count;
937 }
938
939 static void
940 ath5k_setup_rate_idx(struct ath5k_softc *sc, struct ieee80211_supported_band *b)
941 {
942         u8 i;
943
944         for (i = 0; i < AR5K_MAX_RATES; i++)
945                 sc->rate_idx[b->band][i] = -1;
946
947         for (i = 0; i < b->n_bitrates; i++) {
948                 sc->rate_idx[b->band][b->bitrates[i].hw_value] = i;
949                 if (b->bitrates[i].hw_value_short)
950                         sc->rate_idx[b->band][b->bitrates[i].hw_value_short] = i;
951         }
952 }
953
954 static int
955 ath5k_setup_bands(struct ieee80211_hw *hw)
956 {
957         struct ath5k_softc *sc = hw->priv;
958         struct ath5k_hw *ah = sc->ah;
959         struct ieee80211_supported_band *sband;
960         int max_c, count_c = 0;
961         int i;
962
963         BUILD_BUG_ON(ARRAY_SIZE(sc->sbands) < IEEE80211_NUM_BANDS);
964         max_c = ARRAY_SIZE(sc->channels);
965
966         /* 2GHz band */
967         sband = &sc->sbands[IEEE80211_BAND_2GHZ];
968         sband->band = IEEE80211_BAND_2GHZ;
969         sband->bitrates = &sc->rates[IEEE80211_BAND_2GHZ][0];
970
971         if (test_bit(AR5K_MODE_11G, sc->ah->ah_capabilities.cap_mode)) {
972                 /* G mode */
973                 memcpy(sband->bitrates, &ath5k_rates[0],
974                        sizeof(struct ieee80211_rate) * 12);
975                 sband->n_bitrates = 12;
976
977                 sband->channels = sc->channels;
978                 sband->n_channels = ath5k_copy_channels(ah, sband->channels,
979                                         AR5K_MODE_11G, max_c);
980
981                 hw->wiphy->bands[IEEE80211_BAND_2GHZ] = sband;
982                 count_c = sband->n_channels;
983                 max_c -= count_c;
984         } else if (test_bit(AR5K_MODE_11B, sc->ah->ah_capabilities.cap_mode)) {
985                 /* B mode */
986                 memcpy(sband->bitrates, &ath5k_rates[0],
987                        sizeof(struct ieee80211_rate) * 4);
988                 sband->n_bitrates = 4;
989
990                 /* 5211 only supports B rates and uses 4bit rate codes
991                  * (e.g normally we have 0x1B for 1M, but on 5211 we have 0x0B)
992                  * fix them up here:
993                  */
994                 if (ah->ah_version == AR5K_AR5211) {
995                         for (i = 0; i < 4; i++) {
996                                 sband->bitrates[i].hw_value =
997                                         sband->bitrates[i].hw_value & 0xF;
998                                 sband->bitrates[i].hw_value_short =
999                                         sband->bitrates[i].hw_value_short & 0xF;
1000                         }
1001                 }
1002
1003                 sband->channels = sc->channels;
1004                 sband->n_channels = ath5k_copy_channels(ah, sband->channels,
1005                                         AR5K_MODE_11B, max_c);
1006
1007                 hw->wiphy->bands[IEEE80211_BAND_2GHZ] = sband;
1008                 count_c = sband->n_channels;
1009                 max_c -= count_c;
1010         }
1011         ath5k_setup_rate_idx(sc, sband);
1012
1013         /* 5GHz band, A mode */
1014         if (test_bit(AR5K_MODE_11A, sc->ah->ah_capabilities.cap_mode)) {
1015                 sband = &sc->sbands[IEEE80211_BAND_5GHZ];
1016                 sband->band = IEEE80211_BAND_5GHZ;
1017                 sband->bitrates = &sc->rates[IEEE80211_BAND_5GHZ][0];
1018
1019                 memcpy(sband->bitrates, &ath5k_rates[4],
1020                        sizeof(struct ieee80211_rate) * 8);
1021                 sband->n_bitrates = 8;
1022
1023                 sband->channels = &sc->channels[count_c];
1024                 sband->n_channels = ath5k_copy_channels(ah, sband->channels,
1025                                         AR5K_MODE_11A, max_c);
1026
1027                 hw->wiphy->bands[IEEE80211_BAND_5GHZ] = sband;
1028         }
1029         ath5k_setup_rate_idx(sc, sband);
1030
1031         ath5k_debug_dump_bands(sc);
1032
1033         return 0;
1034 }
1035
1036 /*
1037  * Set/change channels.  If the channel is really being changed,
1038  * it's done by reseting the chip.  To accomplish this we must
1039  * first cleanup any pending DMA, then restart stuff after a la
1040  * ath5k_init.
1041  *
1042  * Called with sc->lock.
1043  */
1044 static int
1045 ath5k_chan_set(struct ath5k_softc *sc, struct ieee80211_channel *chan)
1046 {
1047         ATH5K_DBG(sc, ATH5K_DEBUG_RESET, "(%u MHz) -> (%u MHz)\n",
1048                 sc->curchan->center_freq, chan->center_freq);
1049
1050         if (chan->center_freq != sc->curchan->center_freq ||
1051                 chan->hw_value != sc->curchan->hw_value) {
1052
1053                 sc->curchan = chan;
1054                 sc->curband = &sc->sbands[chan->band];
1055
1056                 /*
1057                  * To switch channels clear any pending DMA operations;
1058                  * wait long enough for the RX fifo to drain, reset the
1059                  * hardware at the new frequency, and then re-enable
1060                  * the relevant bits of the h/w.
1061                  */
1062                 return ath5k_reset(sc, true, true);
1063         }
1064
1065         return 0;
1066 }
1067
1068 static void
1069 ath5k_setcurmode(struct ath5k_softc *sc, unsigned int mode)
1070 {
1071         sc->curmode = mode;
1072
1073         if (mode == AR5K_MODE_11A) {
1074                 sc->curband = &sc->sbands[IEEE80211_BAND_5GHZ];
1075         } else {
1076                 sc->curband = &sc->sbands[IEEE80211_BAND_2GHZ];
1077         }
1078 }
1079
1080 static void
1081 ath5k_mode_setup(struct ath5k_softc *sc)
1082 {
1083         struct ath5k_hw *ah = sc->ah;
1084         u32 rfilt;
1085
1086         /* configure rx filter */
1087         rfilt = sc->filter_flags;
1088         ath5k_hw_set_rx_filter(ah, rfilt);
1089
1090         if (ath5k_hw_hasbssidmask(ah))
1091                 ath5k_hw_set_bssid_mask(ah, sc->bssidmask);
1092
1093         /* configure operational mode */
1094         ath5k_hw_set_opmode(ah);
1095
1096         ath5k_hw_set_mcast_filter(ah, 0, 0);
1097         ATH5K_DBG(sc, ATH5K_DEBUG_MODE, "RX filter 0x%x\n", rfilt);
1098 }
1099
1100 static inline int
1101 ath5k_hw_to_driver_rix(struct ath5k_softc *sc, int hw_rix)
1102 {
1103         WARN_ON(hw_rix < 0 || hw_rix > AR5K_MAX_RATES);
1104         return sc->rate_idx[sc->curband->band][hw_rix];
1105 }
1106
1107 /***************\
1108 * Buffers setup *
1109 \***************/
1110
1111 static
1112 struct sk_buff *ath5k_rx_skb_alloc(struct ath5k_softc *sc, dma_addr_t *skb_addr)
1113 {
1114         struct sk_buff *skb;
1115         unsigned int off;
1116
1117         /*
1118          * Allocate buffer with headroom_needed space for the
1119          * fake physical layer header at the start.
1120          */
1121         skb = dev_alloc_skb(sc->rxbufsize + sc->cachelsz - 1);
1122
1123         if (!skb) {
1124                 ATH5K_ERR(sc, "can't alloc skbuff of size %u\n",
1125                                 sc->rxbufsize + sc->cachelsz - 1);
1126                 return NULL;
1127         }
1128         /*
1129          * Cache-line-align.  This is important (for the
1130          * 5210 at least) as not doing so causes bogus data
1131          * in rx'd frames.
1132          */
1133         off = ((unsigned long)skb->data) % sc->cachelsz;
1134         if (off != 0)
1135                 skb_reserve(skb, sc->cachelsz - off);
1136
1137         *skb_addr = pci_map_single(sc->pdev,
1138                 skb->data, sc->rxbufsize, PCI_DMA_FROMDEVICE);
1139         if (unlikely(pci_dma_mapping_error(sc->pdev, *skb_addr))) {
1140                 ATH5K_ERR(sc, "%s: DMA mapping failed\n", __func__);
1141                 dev_kfree_skb(skb);
1142                 return NULL;
1143         }
1144         return skb;
1145 }
1146
1147 static int
1148 ath5k_rxbuf_setup(struct ath5k_softc *sc, struct ath5k_buf *bf)
1149 {
1150         struct ath5k_hw *ah = sc->ah;
1151         struct sk_buff *skb = bf->skb;
1152         struct ath5k_desc *ds;
1153
1154         if (!skb) {
1155                 skb = ath5k_rx_skb_alloc(sc, &bf->skbaddr);
1156                 if (!skb)
1157                         return -ENOMEM;
1158                 bf->skb = skb;
1159         }
1160
1161         /*
1162          * Setup descriptors.  For receive we always terminate
1163          * the descriptor list with a self-linked entry so we'll
1164          * not get overrun under high load (as can happen with a
1165          * 5212 when ANI processing enables PHY error frames).
1166          *
1167          * To insure the last descriptor is self-linked we create
1168          * each descriptor as self-linked and add it to the end.  As
1169          * each additional descriptor is added the previous self-linked
1170          * entry is ``fixed'' naturally.  This should be safe even
1171          * if DMA is happening.  When processing RX interrupts we
1172          * never remove/process the last, self-linked, entry on the
1173          * descriptor list.  This insures the hardware always has
1174          * someplace to write a new frame.
1175          */
1176         ds = bf->desc;
1177         ds->ds_link = bf->daddr;        /* link to self */
1178         ds->ds_data = bf->skbaddr;
1179         ah->ah_setup_rx_desc(ah, ds,
1180                 skb_tailroom(skb),      /* buffer size */
1181                 0);
1182
1183         if (sc->rxlink != NULL)
1184                 *sc->rxlink = bf->daddr;
1185         sc->rxlink = &ds->ds_link;
1186         return 0;
1187 }
1188
1189 static int
1190 ath5k_txbuf_setup(struct ath5k_softc *sc, struct ath5k_buf *bf)
1191 {
1192         struct ath5k_hw *ah = sc->ah;
1193         struct ath5k_txq *txq = sc->txq;
1194         struct ath5k_desc *ds = bf->desc;
1195         struct sk_buff *skb = bf->skb;
1196         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1197         unsigned int pktlen, flags, keyidx = AR5K_TXKEYIX_INVALID;
1198         struct ieee80211_rate *rate;
1199         unsigned int mrr_rate[3], mrr_tries[3];
1200         int i, ret;
1201         u16 hw_rate;
1202         u16 cts_rate = 0;
1203         u16 duration = 0;
1204         u8 rc_flags;
1205
1206         flags = AR5K_TXDESC_INTREQ | AR5K_TXDESC_CLRDMASK;
1207
1208         /* XXX endianness */
1209         bf->skbaddr = pci_map_single(sc->pdev, skb->data, skb->len,
1210                         PCI_DMA_TODEVICE);
1211
1212         rate = ieee80211_get_tx_rate(sc->hw, info);
1213
1214         if (info->flags & IEEE80211_TX_CTL_NO_ACK)
1215                 flags |= AR5K_TXDESC_NOACK;
1216
1217         rc_flags = info->control.rates[0].flags;
1218         hw_rate = (rc_flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE) ?
1219                 rate->hw_value_short : rate->hw_value;
1220
1221         pktlen = skb->len;
1222
1223         if (info->control.hw_key) {
1224                 keyidx = info->control.hw_key->hw_key_idx;
1225                 pktlen += info->control.hw_key->icv_len;
1226         }
1227         if (rc_flags & IEEE80211_TX_RC_USE_RTS_CTS) {
1228                 flags |= AR5K_TXDESC_RTSENA;
1229                 cts_rate = ieee80211_get_rts_cts_rate(sc->hw, info)->hw_value;
1230                 duration = le16_to_cpu(ieee80211_rts_duration(sc->hw,
1231                         sc->vif, pktlen, info));
1232         }
1233         if (rc_flags & IEEE80211_TX_RC_USE_CTS_PROTECT) {
1234                 flags |= AR5K_TXDESC_CTSENA;
1235                 cts_rate = ieee80211_get_rts_cts_rate(sc->hw, info)->hw_value;
1236                 duration = le16_to_cpu(ieee80211_ctstoself_duration(sc->hw,
1237                         sc->vif, pktlen, info));
1238         }
1239         ret = ah->ah_setup_tx_desc(ah, ds, pktlen,
1240                 ieee80211_get_hdrlen_from_skb(skb), AR5K_PKT_TYPE_NORMAL,
1241                 (sc->power_level * 2),
1242                 hw_rate,
1243                 info->control.rates[0].count, keyidx, 0, flags,
1244                 cts_rate, duration);
1245         if (ret)
1246                 goto err_unmap;
1247
1248         memset(mrr_rate, 0, sizeof(mrr_rate));
1249         memset(mrr_tries, 0, sizeof(mrr_tries));
1250         for (i = 0; i < 3; i++) {
1251                 rate = ieee80211_get_alt_retry_rate(sc->hw, info, i);
1252                 if (!rate)
1253                         break;
1254
1255                 mrr_rate[i] = rate->hw_value;
1256                 mrr_tries[i] = info->control.rates[i + 1].count;
1257         }
1258
1259         ah->ah_setup_mrr_tx_desc(ah, ds,
1260                 mrr_rate[0], mrr_tries[0],
1261                 mrr_rate[1], mrr_tries[1],
1262                 mrr_rate[2], mrr_tries[2]);
1263
1264         ds->ds_link = 0;
1265         ds->ds_data = bf->skbaddr;
1266
1267         spin_lock_bh(&txq->lock);
1268         list_add_tail(&bf->list, &txq->q);
1269         sc->tx_stats[txq->qnum].len++;
1270         if (txq->link == NULL) /* is this first packet? */
1271                 ath5k_hw_set_txdp(ah, txq->qnum, bf->daddr);
1272         else /* no, so only link it */
1273                 *txq->link = bf->daddr;
1274
1275         txq->link = &ds->ds_link;
1276         ath5k_hw_start_tx_dma(ah, txq->qnum);
1277         mmiowb();
1278         spin_unlock_bh(&txq->lock);
1279
1280         return 0;
1281 err_unmap:
1282         pci_unmap_single(sc->pdev, bf->skbaddr, skb->len, PCI_DMA_TODEVICE);
1283         return ret;
1284 }
1285
1286 /*******************\
1287 * Descriptors setup *
1288 \*******************/
1289
1290 static int
1291 ath5k_desc_alloc(struct ath5k_softc *sc, struct pci_dev *pdev)
1292 {
1293         struct ath5k_desc *ds;
1294         struct ath5k_buf *bf;
1295         dma_addr_t da;
1296         unsigned int i;
1297         int ret;
1298
1299         /* allocate descriptors */
1300         sc->desc_len = sizeof(struct ath5k_desc) *
1301                         (ATH_TXBUF + ATH_RXBUF + ATH_BCBUF + 1);
1302         sc->desc = pci_alloc_consistent(pdev, sc->desc_len, &sc->desc_daddr);
1303         if (sc->desc == NULL) {
1304                 ATH5K_ERR(sc, "can't allocate descriptors\n");
1305                 ret = -ENOMEM;
1306                 goto err;
1307         }
1308         ds = sc->desc;
1309         da = sc->desc_daddr;
1310         ATH5K_DBG(sc, ATH5K_DEBUG_ANY, "DMA map: %p (%zu) -> %llx\n",
1311                 ds, sc->desc_len, (unsigned long long)sc->desc_daddr);
1312
1313         bf = kcalloc(1 + ATH_TXBUF + ATH_RXBUF + ATH_BCBUF,
1314                         sizeof(struct ath5k_buf), GFP_KERNEL);
1315         if (bf == NULL) {
1316                 ATH5K_ERR(sc, "can't allocate bufptr\n");
1317                 ret = -ENOMEM;
1318                 goto err_free;
1319         }
1320         sc->bufptr = bf;
1321
1322         INIT_LIST_HEAD(&sc->rxbuf);
1323         for (i = 0; i < ATH_RXBUF; i++, bf++, ds++, da += sizeof(*ds)) {
1324                 bf->desc = ds;
1325                 bf->daddr = da;
1326                 list_add_tail(&bf->list, &sc->rxbuf);
1327         }
1328
1329         INIT_LIST_HEAD(&sc->txbuf);
1330         sc->txbuf_len = ATH_TXBUF;
1331         for (i = 0; i < ATH_TXBUF; i++, bf++, ds++,
1332                         da += sizeof(*ds)) {
1333                 bf->desc = ds;
1334                 bf->daddr = da;
1335                 list_add_tail(&bf->list, &sc->txbuf);
1336         }
1337
1338         /* beacon buffer */
1339         bf->desc = ds;
1340         bf->daddr = da;
1341         sc->bbuf = bf;
1342
1343         return 0;
1344 err_free:
1345         pci_free_consistent(pdev, sc->desc_len, sc->desc, sc->desc_daddr);
1346 err:
1347         sc->desc = NULL;
1348         return ret;
1349 }
1350
1351 static void
1352 ath5k_desc_free(struct ath5k_softc *sc, struct pci_dev *pdev)
1353 {
1354         struct ath5k_buf *bf;
1355
1356         ath5k_txbuf_free(sc, sc->bbuf);
1357         list_for_each_entry(bf, &sc->txbuf, list)
1358                 ath5k_txbuf_free(sc, bf);
1359         list_for_each_entry(bf, &sc->rxbuf, list)
1360                 ath5k_rxbuf_free(sc, bf);
1361
1362         /* Free memory associated with all descriptors */
1363         pci_free_consistent(pdev, sc->desc_len, sc->desc, sc->desc_daddr);
1364
1365         kfree(sc->bufptr);
1366         sc->bufptr = NULL;
1367 }
1368
1369
1370
1371
1372
1373 /**************\
1374 * Queues setup *
1375 \**************/
1376
1377 static struct ath5k_txq *
1378 ath5k_txq_setup(struct ath5k_softc *sc,
1379                 int qtype, int subtype)
1380 {
1381         struct ath5k_hw *ah = sc->ah;
1382         struct ath5k_txq *txq;
1383         struct ath5k_txq_info qi = {
1384                 .tqi_subtype = subtype,
1385                 .tqi_aifs = AR5K_TXQ_USEDEFAULT,
1386                 .tqi_cw_min = AR5K_TXQ_USEDEFAULT,
1387                 .tqi_cw_max = AR5K_TXQ_USEDEFAULT
1388         };
1389         int qnum;
1390
1391         /*
1392          * Enable interrupts only for EOL and DESC conditions.
1393          * We mark tx descriptors to receive a DESC interrupt
1394          * when a tx queue gets deep; otherwise waiting for the
1395          * EOL to reap descriptors.  Note that this is done to
1396          * reduce interrupt load and this only defers reaping
1397          * descriptors, never transmitting frames.  Aside from
1398          * reducing interrupts this also permits more concurrency.
1399          * The only potential downside is if the tx queue backs
1400          * up in which case the top half of the kernel may backup
1401          * due to a lack of tx descriptors.
1402          */
1403         qi.tqi_flags = AR5K_TXQ_FLAG_TXEOLINT_ENABLE |
1404                                 AR5K_TXQ_FLAG_TXDESCINT_ENABLE;
1405         qnum = ath5k_hw_setup_tx_queue(ah, qtype, &qi);
1406         if (qnum < 0) {
1407                 /*
1408                  * NB: don't print a message, this happens
1409                  * normally on parts with too few tx queues
1410                  */
1411                 return ERR_PTR(qnum);
1412         }
1413         if (qnum >= ARRAY_SIZE(sc->txqs)) {
1414                 ATH5K_ERR(sc, "hw qnum %u out of range, max %tu!\n",
1415                         qnum, ARRAY_SIZE(sc->txqs));
1416                 ath5k_hw_release_tx_queue(ah, qnum);
1417                 return ERR_PTR(-EINVAL);
1418         }
1419         txq = &sc->txqs[qnum];
1420         if (!txq->setup) {
1421                 txq->qnum = qnum;
1422                 txq->link = NULL;
1423                 INIT_LIST_HEAD(&txq->q);
1424                 spin_lock_init(&txq->lock);
1425                 txq->setup = true;
1426         }
1427         return &sc->txqs[qnum];
1428 }
1429
1430 static int
1431 ath5k_beaconq_setup(struct ath5k_hw *ah)
1432 {
1433         struct ath5k_txq_info qi = {
1434                 .tqi_aifs = AR5K_TXQ_USEDEFAULT,
1435                 .tqi_cw_min = AR5K_TXQ_USEDEFAULT,
1436                 .tqi_cw_max = AR5K_TXQ_USEDEFAULT,
1437                 /* NB: for dynamic turbo, don't enable any other interrupts */
1438                 .tqi_flags = AR5K_TXQ_FLAG_TXDESCINT_ENABLE
1439         };
1440
1441         return ath5k_hw_setup_tx_queue(ah, AR5K_TX_QUEUE_BEACON, &qi);
1442 }
1443
1444 static int
1445 ath5k_beaconq_config(struct ath5k_softc *sc)
1446 {
1447         struct ath5k_hw *ah = sc->ah;
1448         struct ath5k_txq_info qi;
1449         int ret;
1450
1451         ret = ath5k_hw_get_tx_queueprops(ah, sc->bhalq, &qi);
1452         if (ret)
1453                 return ret;
1454         if (sc->opmode == NL80211_IFTYPE_AP ||
1455                 sc->opmode == NL80211_IFTYPE_MESH_POINT) {
1456                 /*
1457                  * Always burst out beacon and CAB traffic
1458                  * (aifs = cwmin = cwmax = 0)
1459                  */
1460                 qi.tqi_aifs = 0;
1461                 qi.tqi_cw_min = 0;
1462                 qi.tqi_cw_max = 0;
1463         } else if (sc->opmode == NL80211_IFTYPE_ADHOC) {
1464                 /*
1465                  * Adhoc mode; backoff between 0 and (2 * cw_min).
1466                  */
1467                 qi.tqi_aifs = 0;
1468                 qi.tqi_cw_min = 0;
1469                 qi.tqi_cw_max = 2 * ah->ah_cw_min;
1470         }
1471
1472         ATH5K_DBG(sc, ATH5K_DEBUG_BEACON,
1473                 "beacon queueprops tqi_aifs:%d tqi_cw_min:%d tqi_cw_max:%d\n",
1474                 qi.tqi_aifs, qi.tqi_cw_min, qi.tqi_cw_max);
1475
1476         ret = ath5k_hw_set_tx_queueprops(ah, sc->bhalq, &qi);
1477         if (ret) {
1478                 ATH5K_ERR(sc, "%s: unable to update parameters for beacon "
1479                         "hardware queue!\n", __func__);
1480                 return ret;
1481         }
1482
1483         return ath5k_hw_reset_tx_queue(ah, sc->bhalq); /* push to h/w */;
1484 }
1485
1486 static void
1487 ath5k_txq_drainq(struct ath5k_softc *sc, struct ath5k_txq *txq)
1488 {
1489         struct ath5k_buf *bf, *bf0;
1490
1491         /*
1492          * NB: this assumes output has been stopped and
1493          *     we do not need to block ath5k_tx_tasklet
1494          */
1495         spin_lock_bh(&txq->lock);
1496         list_for_each_entry_safe(bf, bf0, &txq->q, list) {
1497                 ath5k_debug_printtxbuf(sc, bf);
1498
1499                 ath5k_txbuf_free(sc, bf);
1500
1501                 spin_lock_bh(&sc->txbuflock);
1502                 sc->tx_stats[txq->qnum].len--;
1503                 list_move_tail(&bf->list, &sc->txbuf);
1504                 sc->txbuf_len++;
1505                 spin_unlock_bh(&sc->txbuflock);
1506         }
1507         txq->link = NULL;
1508         spin_unlock_bh(&txq->lock);
1509 }
1510
1511 /*
1512  * Drain the transmit queues and reclaim resources.
1513  */
1514 static void
1515 ath5k_txq_cleanup(struct ath5k_softc *sc)
1516 {
1517         struct ath5k_hw *ah = sc->ah;
1518         unsigned int i;
1519
1520         /* XXX return value */
1521         if (likely(!test_bit(ATH_STAT_INVALID, sc->status))) {
1522                 /* don't touch the hardware if marked invalid */
1523                 ath5k_hw_stop_tx_dma(ah, sc->bhalq);
1524                 ATH5K_DBG(sc, ATH5K_DEBUG_RESET, "beacon queue %x\n",
1525                         ath5k_hw_get_txdp(ah, sc->bhalq));
1526                 for (i = 0; i < ARRAY_SIZE(sc->txqs); i++)
1527                         if (sc->txqs[i].setup) {
1528                                 ath5k_hw_stop_tx_dma(ah, sc->txqs[i].qnum);
1529                                 ATH5K_DBG(sc, ATH5K_DEBUG_RESET, "txq [%u] %x, "
1530                                         "link %p\n",
1531                                         sc->txqs[i].qnum,
1532                                         ath5k_hw_get_txdp(ah,
1533                                                         sc->txqs[i].qnum),
1534                                         sc->txqs[i].link);
1535                         }
1536         }
1537         ieee80211_wake_queues(sc->hw); /* XXX move to callers */
1538
1539         for (i = 0; i < ARRAY_SIZE(sc->txqs); i++)
1540                 if (sc->txqs[i].setup)
1541                         ath5k_txq_drainq(sc, &sc->txqs[i]);
1542 }
1543
1544 static void
1545 ath5k_txq_release(struct ath5k_softc *sc)
1546 {
1547         struct ath5k_txq *txq = sc->txqs;
1548         unsigned int i;
1549
1550         for (i = 0; i < ARRAY_SIZE(sc->txqs); i++, txq++)
1551                 if (txq->setup) {
1552                         ath5k_hw_release_tx_queue(sc->ah, txq->qnum);
1553                         txq->setup = false;
1554                 }
1555 }
1556
1557
1558
1559
1560 /*************\
1561 * RX Handling *
1562 \*************/
1563
1564 /*
1565  * Enable the receive h/w following a reset.
1566  */
1567 static int
1568 ath5k_rx_start(struct ath5k_softc *sc)
1569 {
1570         struct ath5k_hw *ah = sc->ah;
1571         struct ath5k_buf *bf;
1572         int ret;
1573
1574         sc->rxbufsize = roundup(IEEE80211_MAX_LEN, sc->cachelsz);
1575
1576         ATH5K_DBG(sc, ATH5K_DEBUG_RESET, "cachelsz %u rxbufsize %u\n",
1577                 sc->cachelsz, sc->rxbufsize);
1578
1579         sc->rxlink = NULL;
1580
1581         spin_lock_bh(&sc->rxbuflock);
1582         list_for_each_entry(bf, &sc->rxbuf, list) {
1583                 ret = ath5k_rxbuf_setup(sc, bf);
1584                 if (ret != 0) {
1585                         spin_unlock_bh(&sc->rxbuflock);
1586                         goto err;
1587                 }
1588         }
1589         bf = list_first_entry(&sc->rxbuf, struct ath5k_buf, list);
1590         spin_unlock_bh(&sc->rxbuflock);
1591
1592         ath5k_hw_set_rxdp(ah, bf->daddr);
1593         ath5k_hw_start_rx_dma(ah);      /* enable recv descriptors */
1594         ath5k_mode_setup(sc);           /* set filters, etc. */
1595         ath5k_hw_start_rx_pcu(ah);      /* re-enable PCU/DMA engine */
1596
1597         return 0;
1598 err:
1599         return ret;
1600 }
1601
1602 /*
1603  * Disable the receive h/w in preparation for a reset.
1604  */
1605 static void
1606 ath5k_rx_stop(struct ath5k_softc *sc)
1607 {
1608         struct ath5k_hw *ah = sc->ah;
1609
1610         ath5k_hw_stop_rx_pcu(ah);       /* disable PCU */
1611         ath5k_hw_set_rx_filter(ah, 0);  /* clear recv filter */
1612         ath5k_hw_stop_rx_dma(ah);       /* disable DMA engine */
1613
1614         ath5k_debug_printrxbuffs(sc, ah);
1615
1616         sc->rxlink = NULL;              /* just in case */
1617 }
1618
1619 static unsigned int
1620 ath5k_rx_decrypted(struct ath5k_softc *sc, struct ath5k_desc *ds,
1621                 struct sk_buff *skb, struct ath5k_rx_status *rs)
1622 {
1623         struct ieee80211_hdr *hdr = (void *)skb->data;
1624         unsigned int keyix, hlen;
1625
1626         if (!(rs->rs_status & AR5K_RXERR_DECRYPT) &&
1627                         rs->rs_keyix != AR5K_RXKEYIX_INVALID)
1628                 return RX_FLAG_DECRYPTED;
1629
1630         /* Apparently when a default key is used to decrypt the packet
1631            the hw does not set the index used to decrypt.  In such cases
1632            get the index from the packet. */
1633         hlen = ieee80211_hdrlen(hdr->frame_control);
1634         if (ieee80211_has_protected(hdr->frame_control) &&
1635             !(rs->rs_status & AR5K_RXERR_DECRYPT) &&
1636             skb->len >= hlen + 4) {
1637                 keyix = skb->data[hlen + 3] >> 6;
1638
1639                 if (test_bit(keyix, sc->keymap))
1640                         return RX_FLAG_DECRYPTED;
1641         }
1642
1643         return 0;
1644 }
1645
1646
1647 static void
1648 ath5k_check_ibss_tsf(struct ath5k_softc *sc, struct sk_buff *skb,
1649                      struct ieee80211_rx_status *rxs)
1650 {
1651         u64 tsf, bc_tstamp;
1652         u32 hw_tu;
1653         struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)skb->data;
1654
1655         if (ieee80211_is_beacon(mgmt->frame_control) &&
1656             le16_to_cpu(mgmt->u.beacon.capab_info) & WLAN_CAPABILITY_IBSS &&
1657             memcmp(mgmt->bssid, sc->ah->ah_bssid, ETH_ALEN) == 0) {
1658                 /*
1659                  * Received an IBSS beacon with the same BSSID. Hardware *must*
1660                  * have updated the local TSF. We have to work around various
1661                  * hardware bugs, though...
1662                  */
1663                 tsf = ath5k_hw_get_tsf64(sc->ah);
1664                 bc_tstamp = le64_to_cpu(mgmt->u.beacon.timestamp);
1665                 hw_tu = TSF_TO_TU(tsf);
1666
1667                 ATH5K_DBG_UNLIMIT(sc, ATH5K_DEBUG_BEACON,
1668                         "beacon %llx mactime %llx (diff %lld) tsf now %llx\n",
1669                         (unsigned long long)bc_tstamp,
1670                         (unsigned long long)rxs->mactime,
1671                         (unsigned long long)(rxs->mactime - bc_tstamp),
1672                         (unsigned long long)tsf);
1673
1674                 /*
1675                  * Sometimes the HW will give us a wrong tstamp in the rx
1676                  * status, causing the timestamp extension to go wrong.
1677                  * (This seems to happen especially with beacon frames bigger
1678                  * than 78 byte (incl. FCS))
1679                  * But we know that the receive timestamp must be later than the
1680                  * timestamp of the beacon since HW must have synced to that.
1681                  *
1682                  * NOTE: here we assume mactime to be after the frame was
1683                  * received, not like mac80211 which defines it at the start.
1684                  */
1685                 if (bc_tstamp > rxs->mactime) {
1686                         ATH5K_DBG_UNLIMIT(sc, ATH5K_DEBUG_BEACON,
1687                                 "fixing mactime from %llx to %llx\n",
1688                                 (unsigned long long)rxs->mactime,
1689                                 (unsigned long long)tsf);
1690                         rxs->mactime = tsf;
1691                 }
1692
1693                 /*
1694                  * Local TSF might have moved higher than our beacon timers,
1695                  * in that case we have to update them to continue sending
1696                  * beacons. This also takes care of synchronizing beacon sending
1697                  * times with other stations.
1698                  */
1699                 if (hw_tu >= sc->nexttbtt)
1700                         ath5k_beacon_update_timers(sc, bc_tstamp);
1701         }
1702 }
1703
1704 static void ath5k_tasklet_beacon(unsigned long data)
1705 {
1706         struct ath5k_softc *sc = (struct ath5k_softc *) data;
1707
1708         /*
1709          * Software beacon alert--time to send a beacon.
1710          *
1711          * In IBSS mode we use this interrupt just to
1712          * keep track of the next TBTT (target beacon
1713          * transmission time) in order to detect wether
1714          * automatic TSF updates happened.
1715          */
1716         if (sc->opmode == NL80211_IFTYPE_ADHOC) {
1717                 /* XXX: only if VEOL suppported */
1718                 u64 tsf = ath5k_hw_get_tsf64(sc->ah);
1719                 sc->nexttbtt += sc->bintval;
1720                 ATH5K_DBG(sc, ATH5K_DEBUG_BEACON,
1721                                 "SWBA nexttbtt: %x hw_tu: %x "
1722                                 "TSF: %llx\n",
1723                                 sc->nexttbtt,
1724                                 TSF_TO_TU(tsf),
1725                                 (unsigned long long) tsf);
1726         } else {
1727                 spin_lock(&sc->block);
1728                 ath5k_beacon_send(sc);
1729                 spin_unlock(&sc->block);
1730         }
1731 }
1732
1733 static void
1734 ath5k_tasklet_rx(unsigned long data)
1735 {
1736         struct ieee80211_rx_status rxs = {};
1737         struct ath5k_rx_status rs = {};
1738         struct sk_buff *skb, *next_skb;
1739         dma_addr_t next_skb_addr;
1740         struct ath5k_softc *sc = (void *)data;
1741         struct ath5k_buf *bf, *bf_last;
1742         struct ath5k_desc *ds;
1743         int ret;
1744         int hdrlen;
1745         int padsize;
1746
1747         spin_lock(&sc->rxbuflock);
1748         if (list_empty(&sc->rxbuf)) {
1749                 ATH5K_WARN(sc, "empty rx buf pool\n");
1750                 goto unlock;
1751         }
1752         bf_last = list_entry(sc->rxbuf.prev, struct ath5k_buf, list);
1753         do {
1754                 rxs.flag = 0;
1755
1756                 bf = list_first_entry(&sc->rxbuf, struct ath5k_buf, list);
1757                 BUG_ON(bf->skb == NULL);
1758                 skb = bf->skb;
1759                 ds = bf->desc;
1760
1761                 /*
1762                  * last buffer must not be freed to ensure proper hardware
1763                  * function. When the hardware finishes also a packet next to
1764                  * it, we are sure, it doesn't use it anymore and we can go on.
1765                  */
1766                 if (bf_last == bf)
1767                         bf->flags |= 1;
1768                 if (bf->flags) {
1769                         struct ath5k_buf *bf_next = list_entry(bf->list.next,
1770                                         struct ath5k_buf, list);
1771                         ret = sc->ah->ah_proc_rx_desc(sc->ah, bf_next->desc,
1772                                         &rs);
1773                         if (ret)
1774                                 break;
1775                         bf->flags &= ~1;
1776                         /* skip the overwritten one (even status is martian) */
1777                         goto next;
1778                 }
1779
1780                 ret = sc->ah->ah_proc_rx_desc(sc->ah, ds, &rs);
1781                 if (unlikely(ret == -EINPROGRESS))
1782                         break;
1783                 else if (unlikely(ret)) {
1784                         ATH5K_ERR(sc, "error in processing rx descriptor\n");
1785                         spin_unlock(&sc->rxbuflock);
1786                         return;
1787                 }
1788
1789                 if (unlikely(rs.rs_more)) {
1790                         ATH5K_WARN(sc, "unsupported jumbo\n");
1791                         goto next;
1792                 }
1793
1794                 if (unlikely(rs.rs_status)) {
1795                         if (rs.rs_status & AR5K_RXERR_PHY)
1796                                 goto next;
1797                         if (rs.rs_status & AR5K_RXERR_DECRYPT) {
1798                                 /*
1799                                  * Decrypt error.  If the error occurred
1800                                  * because there was no hardware key, then
1801                                  * let the frame through so the upper layers
1802                                  * can process it.  This is necessary for 5210
1803                                  * parts which have no way to setup a ``clear''
1804                                  * key cache entry.
1805                                  *
1806                                  * XXX do key cache faulting
1807                                  */
1808                                 if (rs.rs_keyix == AR5K_RXKEYIX_INVALID &&
1809                                     !(rs.rs_status & AR5K_RXERR_CRC))
1810                                         goto accept;
1811                         }
1812                         if (rs.rs_status & AR5K_RXERR_MIC) {
1813                                 rxs.flag |= RX_FLAG_MMIC_ERROR;
1814                                 goto accept;
1815                         }
1816
1817                         /* let crypto-error packets fall through in MNTR */
1818                         if ((rs.rs_status &
1819                                 ~(AR5K_RXERR_DECRYPT|AR5K_RXERR_MIC)) ||
1820                                         sc->opmode != NL80211_IFTYPE_MONITOR)
1821                                 goto next;
1822                 }
1823 accept:
1824                 next_skb = ath5k_rx_skb_alloc(sc, &next_skb_addr);
1825
1826                 /*
1827                  * If we can't replace bf->skb with a new skb under memory
1828                  * pressure, just skip this packet
1829                  */
1830                 if (!next_skb)
1831                         goto next;
1832
1833                 pci_unmap_single(sc->pdev, bf->skbaddr, sc->rxbufsize,
1834                                 PCI_DMA_FROMDEVICE);
1835                 skb_put(skb, rs.rs_datalen);
1836
1837                 /* The MAC header is padded to have 32-bit boundary if the
1838                  * packet payload is non-zero. The general calculation for
1839                  * padsize would take into account odd header lengths:
1840                  * padsize = (4 - hdrlen % 4) % 4; However, since only
1841                  * even-length headers are used, padding can only be 0 or 2
1842                  * bytes and we can optimize this a bit. In addition, we must
1843                  * not try to remove padding from short control frames that do
1844                  * not have payload. */
1845                 hdrlen = ieee80211_get_hdrlen_from_skb(skb);
1846                 padsize = ath5k_pad_size(hdrlen);
1847                 if (padsize) {
1848                         memmove(skb->data + padsize, skb->data, hdrlen);
1849                         skb_pull(skb, padsize);
1850                 }
1851
1852                 /*
1853                  * always extend the mac timestamp, since this information is
1854                  * also needed for proper IBSS merging.
1855                  *
1856                  * XXX: it might be too late to do it here, since rs_tstamp is
1857                  * 15bit only. that means TSF extension has to be done within
1858                  * 32768usec (about 32ms). it might be necessary to move this to
1859                  * the interrupt handler, like it is done in madwifi.
1860                  *
1861                  * Unfortunately we don't know when the hardware takes the rx
1862                  * timestamp (beginning of phy frame, data frame, end of rx?).
1863                  * The only thing we know is that it is hardware specific...
1864                  * On AR5213 it seems the rx timestamp is at the end of the
1865                  * frame, but i'm not sure.
1866                  *
1867                  * NOTE: mac80211 defines mactime at the beginning of the first
1868                  * data symbol. Since we don't have any time references it's
1869                  * impossible to comply to that. This affects IBSS merge only
1870                  * right now, so it's not too bad...
1871                  */
1872                 rxs.mactime = ath5k_extend_tsf(sc->ah, rs.rs_tstamp);
1873                 rxs.flag |= RX_FLAG_TSFT;
1874
1875                 rxs.freq = sc->curchan->center_freq;
1876                 rxs.band = sc->curband->band;
1877
1878                 rxs.noise = sc->ah->ah_noise_floor;
1879                 rxs.signal = rxs.noise + rs.rs_rssi;
1880
1881                 /* An rssi of 35 indicates you should be able use
1882                  * 54 Mbps reliably. A more elaborate scheme can be used
1883                  * here but it requires a map of SNR/throughput for each
1884                  * possible mode used */
1885                 rxs.qual = rs.rs_rssi * 100 / 35;
1886
1887                 /* rssi can be more than 35 though, anything above that
1888                  * should be considered at 100% */
1889                 if (rxs.qual > 100)
1890                         rxs.qual = 100;
1891
1892                 rxs.antenna = rs.rs_antenna;
1893                 rxs.rate_idx = ath5k_hw_to_driver_rix(sc, rs.rs_rate);
1894                 rxs.flag |= ath5k_rx_decrypted(sc, ds, skb, &rs);
1895
1896                 if (rxs.rate_idx >= 0 && rs.rs_rate ==
1897                     sc->curband->bitrates[rxs.rate_idx].hw_value_short)
1898                         rxs.flag |= RX_FLAG_SHORTPRE;
1899
1900                 ath5k_debug_dump_skb(sc, skb, "RX  ", 0);
1901
1902                 /* check beacons in IBSS mode */
1903                 if (sc->opmode == NL80211_IFTYPE_ADHOC)
1904                         ath5k_check_ibss_tsf(sc, skb, &rxs);
1905
1906                 __ieee80211_rx(sc->hw, skb, &rxs);
1907
1908                 bf->skb = next_skb;
1909                 bf->skbaddr = next_skb_addr;
1910 next:
1911                 list_move_tail(&bf->list, &sc->rxbuf);
1912         } while (ath5k_rxbuf_setup(sc, bf) == 0);
1913 unlock:
1914         spin_unlock(&sc->rxbuflock);
1915 }
1916
1917
1918
1919
1920 /*************\
1921 * TX Handling *
1922 \*************/
1923
1924 static void
1925 ath5k_tx_processq(struct ath5k_softc *sc, struct ath5k_txq *txq)
1926 {
1927         struct ath5k_tx_status ts = {};
1928         struct ath5k_buf *bf, *bf0;
1929         struct ath5k_desc *ds;
1930         struct sk_buff *skb;
1931         struct ieee80211_tx_info *info;
1932         int i, ret;
1933
1934         spin_lock(&txq->lock);
1935         list_for_each_entry_safe(bf, bf0, &txq->q, list) {
1936                 ds = bf->desc;
1937
1938                 ret = sc->ah->ah_proc_tx_desc(sc->ah, ds, &ts);
1939                 if (unlikely(ret == -EINPROGRESS))
1940                         break;
1941                 else if (unlikely(ret)) {
1942                         ATH5K_ERR(sc, "error %d while processing queue %u\n",
1943                                 ret, txq->qnum);
1944                         break;
1945                 }
1946
1947                 skb = bf->skb;
1948                 info = IEEE80211_SKB_CB(skb);
1949                 bf->skb = NULL;
1950
1951                 pci_unmap_single(sc->pdev, bf->skbaddr, skb->len,
1952                                 PCI_DMA_TODEVICE);
1953
1954                 ieee80211_tx_info_clear_status(info);
1955                 for (i = 0; i < 4; i++) {
1956                         struct ieee80211_tx_rate *r =
1957                                 &info->status.rates[i];
1958
1959                         if (ts.ts_rate[i]) {
1960                                 r->idx = ath5k_hw_to_driver_rix(sc, ts.ts_rate[i]);
1961                                 r->count = ts.ts_retry[i];
1962                         } else {
1963                                 r->idx = -1;
1964                                 r->count = 0;
1965                         }
1966                 }
1967
1968                 /* count the successful attempt as well */
1969                 info->status.rates[ts.ts_final_idx].count++;
1970
1971                 if (unlikely(ts.ts_status)) {
1972                         sc->ll_stats.dot11ACKFailureCount++;
1973                         if (ts.ts_status & AR5K_TXERR_FILT)
1974                                 info->flags |= IEEE80211_TX_STAT_TX_FILTERED;
1975                 } else {
1976                         info->flags |= IEEE80211_TX_STAT_ACK;
1977                         info->status.ack_signal = ts.ts_rssi;
1978                 }
1979
1980                 ieee80211_tx_status(sc->hw, skb);
1981                 sc->tx_stats[txq->qnum].count++;
1982
1983                 spin_lock(&sc->txbuflock);
1984                 sc->tx_stats[txq->qnum].len--;
1985                 list_move_tail(&bf->list, &sc->txbuf);
1986                 sc->txbuf_len++;
1987                 spin_unlock(&sc->txbuflock);
1988         }
1989         if (likely(list_empty(&txq->q)))
1990                 txq->link = NULL;
1991         spin_unlock(&txq->lock);
1992         if (sc->txbuf_len > ATH_TXBUF / 5)
1993                 ieee80211_wake_queues(sc->hw);
1994 }
1995
1996 static void
1997 ath5k_tasklet_tx(unsigned long data)
1998 {
1999         struct ath5k_softc *sc = (void *)data;
2000
2001         ath5k_tx_processq(sc, sc->txq);
2002 }
2003
2004
2005 /*****************\
2006 * Beacon handling *
2007 \*****************/
2008
2009 /*
2010  * Setup the beacon frame for transmit.
2011  */
2012 static int
2013 ath5k_beacon_setup(struct ath5k_softc *sc, struct ath5k_buf *bf)
2014 {
2015         struct sk_buff *skb = bf->skb;
2016         struct  ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2017         struct ath5k_hw *ah = sc->ah;
2018         struct ath5k_desc *ds;
2019         int ret, antenna = 0;
2020         u32 flags;
2021
2022         bf->skbaddr = pci_map_single(sc->pdev, skb->data, skb->len,
2023                         PCI_DMA_TODEVICE);
2024         ATH5K_DBG(sc, ATH5K_DEBUG_BEACON, "skb %p [data %p len %u] "
2025                         "skbaddr %llx\n", skb, skb->data, skb->len,
2026                         (unsigned long long)bf->skbaddr);
2027         if (pci_dma_mapping_error(sc->pdev, bf->skbaddr)) {
2028                 ATH5K_ERR(sc, "beacon DMA mapping failed\n");
2029                 return -EIO;
2030         }
2031
2032         ds = bf->desc;
2033
2034         flags = AR5K_TXDESC_NOACK;
2035         if (sc->opmode == NL80211_IFTYPE_ADHOC && ath5k_hw_hasveol(ah)) {
2036                 ds->ds_link = bf->daddr;        /* self-linked */
2037                 flags |= AR5K_TXDESC_VEOL;
2038                 /*
2039                  * Let hardware handle antenna switching if txantenna is not set
2040                  */
2041         } else {
2042                 ds->ds_link = 0;
2043                 /*
2044                  * Switch antenna every 4 beacons if txantenna is not set
2045                  * XXX assumes two antennas
2046                  */
2047                 if (antenna == 0)
2048                         antenna = sc->bsent & 4 ? 2 : 1;
2049         }
2050
2051         ds->ds_data = bf->skbaddr;
2052         ret = ah->ah_setup_tx_desc(ah, ds, skb->len,
2053                         ieee80211_get_hdrlen_from_skb(skb),
2054                         AR5K_PKT_TYPE_BEACON, (sc->power_level * 2),
2055                         ieee80211_get_tx_rate(sc->hw, info)->hw_value,
2056                         1, AR5K_TXKEYIX_INVALID,
2057                         antenna, flags, 0, 0);
2058         if (ret)
2059                 goto err_unmap;
2060
2061         return 0;
2062 err_unmap:
2063         pci_unmap_single(sc->pdev, bf->skbaddr, skb->len, PCI_DMA_TODEVICE);
2064         return ret;
2065 }
2066
2067 /*
2068  * Transmit a beacon frame at SWBA.  Dynamic updates to the
2069  * frame contents are done as needed and the slot time is
2070  * also adjusted based on current state.
2071  *
2072  * This is called from software irq context (beacontq or restq
2073  * tasklets) or user context from ath5k_beacon_config.
2074  */
2075 static void
2076 ath5k_beacon_send(struct ath5k_softc *sc)
2077 {
2078         struct ath5k_buf *bf = sc->bbuf;
2079         struct ath5k_hw *ah = sc->ah;
2080
2081         ATH5K_DBG_UNLIMIT(sc, ATH5K_DEBUG_BEACON, "in beacon_send\n");
2082
2083         if (unlikely(bf->skb == NULL || sc->opmode == NL80211_IFTYPE_STATION ||
2084                         sc->opmode == NL80211_IFTYPE_MONITOR)) {
2085                 ATH5K_WARN(sc, "bf=%p bf_skb=%p\n", bf, bf ? bf->skb : NULL);
2086                 return;
2087         }
2088         /*
2089          * Check if the previous beacon has gone out.  If
2090          * not don't don't try to post another, skip this
2091          * period and wait for the next.  Missed beacons
2092          * indicate a problem and should not occur.  If we
2093          * miss too many consecutive beacons reset the device.
2094          */
2095         if (unlikely(ath5k_hw_num_tx_pending(ah, sc->bhalq) != 0)) {
2096                 sc->bmisscount++;
2097                 ATH5K_DBG(sc, ATH5K_DEBUG_BEACON,
2098                         "missed %u consecutive beacons\n", sc->bmisscount);
2099                 if (sc->bmisscount > 3) {               /* NB: 3 is a guess */
2100                         ATH5K_DBG(sc, ATH5K_DEBUG_BEACON,
2101                                 "stuck beacon time (%u missed)\n",
2102                                 sc->bmisscount);
2103                         tasklet_schedule(&sc->restq);
2104                 }
2105                 return;
2106         }
2107         if (unlikely(sc->bmisscount != 0)) {
2108                 ATH5K_DBG(sc, ATH5K_DEBUG_BEACON,
2109                         "resume beacon xmit after %u misses\n",
2110                         sc->bmisscount);
2111                 sc->bmisscount = 0;
2112         }
2113
2114         /*
2115          * Stop any current dma and put the new frame on the queue.
2116          * This should never fail since we check above that no frames
2117          * are still pending on the queue.
2118          */
2119         if (unlikely(ath5k_hw_stop_tx_dma(ah, sc->bhalq))) {
2120                 ATH5K_WARN(sc, "beacon queue %u didn't stop?\n", sc->bhalq);
2121                 /* NB: hw still stops DMA, so proceed */
2122         }
2123
2124         ath5k_hw_set_txdp(ah, sc->bhalq, bf->daddr);
2125         ath5k_hw_start_tx_dma(ah, sc->bhalq);
2126         ATH5K_DBG(sc, ATH5K_DEBUG_BEACON, "TXDP[%u] = %llx (%p)\n",
2127                 sc->bhalq, (unsigned long long)bf->daddr, bf->desc);
2128
2129         sc->bsent++;
2130 }
2131
2132
2133 /**
2134  * ath5k_beacon_update_timers - update beacon timers
2135  *
2136  * @sc: struct ath5k_softc pointer we are operating on
2137  * @bc_tsf: the timestamp of the beacon. 0 to reset the TSF. -1 to perform a
2138  *          beacon timer update based on the current HW TSF.
2139  *
2140  * Calculate the next target beacon transmit time (TBTT) based on the timestamp
2141  * of a received beacon or the current local hardware TSF and write it to the
2142  * beacon timer registers.
2143  *
2144  * This is called in a variety of situations, e.g. when a beacon is received,
2145  * when a TSF update has been detected, but also when an new IBSS is created or
2146  * when we otherwise know we have to update the timers, but we keep it in this
2147  * function to have it all together in one place.
2148  */
2149 static void
2150 ath5k_beacon_update_timers(struct ath5k_softc *sc, u64 bc_tsf)
2151 {
2152         struct ath5k_hw *ah = sc->ah;
2153         u32 nexttbtt, intval, hw_tu, bc_tu;
2154         u64 hw_tsf;
2155
2156         intval = sc->bintval & AR5K_BEACON_PERIOD;
2157         if (WARN_ON(!intval))
2158                 return;
2159
2160         /* beacon TSF converted to TU */
2161         bc_tu = TSF_TO_TU(bc_tsf);
2162
2163         /* current TSF converted to TU */
2164         hw_tsf = ath5k_hw_get_tsf64(ah);
2165         hw_tu = TSF_TO_TU(hw_tsf);
2166
2167 #define FUDGE 3
2168         /* we use FUDGE to make sure the next TBTT is ahead of the current TU */
2169         if (bc_tsf == -1) {
2170                 /*
2171                  * no beacons received, called internally.
2172                  * just need to refresh timers based on HW TSF.
2173                  */
2174                 nexttbtt = roundup(hw_tu + FUDGE, intval);
2175         } else if (bc_tsf == 0) {
2176                 /*
2177                  * no beacon received, probably called by ath5k_reset_tsf().
2178                  * reset TSF to start with 0.
2179                  */
2180                 nexttbtt = intval;
2181                 intval |= AR5K_BEACON_RESET_TSF;
2182         } else if (bc_tsf > hw_tsf) {
2183                 /*
2184                  * beacon received, SW merge happend but HW TSF not yet updated.
2185                  * not possible to reconfigure timers yet, but next time we
2186                  * receive a beacon with the same BSSID, the hardware will
2187                  * automatically update the TSF and then we need to reconfigure
2188                  * the timers.
2189                  */
2190                 ATH5K_DBG_UNLIMIT(sc, ATH5K_DEBUG_BEACON,
2191                         "need to wait for HW TSF sync\n");
2192                 return;
2193         } else {
2194                 /*
2195                  * most important case for beacon synchronization between STA.
2196                  *
2197                  * beacon received and HW TSF has been already updated by HW.
2198                  * update next TBTT based on the TSF of the beacon, but make
2199                  * sure it is ahead of our local TSF timer.
2200                  */
2201                 nexttbtt = bc_tu + roundup(hw_tu + FUDGE - bc_tu, intval);
2202         }
2203 #undef FUDGE
2204
2205         sc->nexttbtt = nexttbtt;
2206
2207         intval |= AR5K_BEACON_ENA;
2208         ath5k_hw_init_beacon(ah, nexttbtt, intval);
2209
2210         /*
2211          * debugging output last in order to preserve the time critical aspect
2212          * of this function
2213          */
2214         if (bc_tsf == -1)
2215                 ATH5K_DBG_UNLIMIT(sc, ATH5K_DEBUG_BEACON,
2216                         "reconfigured timers based on HW TSF\n");
2217         else if (bc_tsf == 0)
2218                 ATH5K_DBG_UNLIMIT(sc, ATH5K_DEBUG_BEACON,
2219                         "reset HW TSF and timers\n");
2220         else
2221                 ATH5K_DBG_UNLIMIT(sc, ATH5K_DEBUG_BEACON,
2222                         "updated timers based on beacon TSF\n");
2223
2224         ATH5K_DBG_UNLIMIT(sc, ATH5K_DEBUG_BEACON,
2225                           "bc_tsf %llx hw_tsf %llx bc_tu %u hw_tu %u nexttbtt %u\n",
2226                           (unsigned long long) bc_tsf,
2227                           (unsigned long long) hw_tsf, bc_tu, hw_tu, nexttbtt);
2228         ATH5K_DBG_UNLIMIT(sc, ATH5K_DEBUG_BEACON, "intval %u %s %s\n",
2229                 intval & AR5K_BEACON_PERIOD,
2230                 intval & AR5K_BEACON_ENA ? "AR5K_BEACON_ENA" : "",
2231                 intval & AR5K_BEACON_RESET_TSF ? "AR5K_BEACON_RESET_TSF" : "");
2232 }
2233
2234
2235 /**
2236  * ath5k_beacon_config - Configure the beacon queues and interrupts
2237  *
2238  * @sc: struct ath5k_softc pointer we are operating on
2239  *
2240  * In IBSS mode we use a self-linked tx descriptor if possible. We enable SWBA
2241  * interrupts to detect TSF updates only.
2242  */
2243 static void
2244 ath5k_beacon_config(struct ath5k_softc *sc)
2245 {
2246         struct ath5k_hw *ah = sc->ah;
2247         unsigned long flags;
2248
2249         ath5k_hw_set_imr(ah, 0);
2250         sc->bmisscount = 0;
2251         sc->imask &= ~(AR5K_INT_BMISS | AR5K_INT_SWBA);
2252
2253         if (sc->opmode == NL80211_IFTYPE_ADHOC ||
2254                         sc->opmode == NL80211_IFTYPE_MESH_POINT ||
2255                         sc->opmode == NL80211_IFTYPE_AP) {
2256                 /*
2257                  * In IBSS mode we use a self-linked tx descriptor and let the
2258                  * hardware send the beacons automatically. We have to load it
2259                  * only once here.
2260                  * We use the SWBA interrupt only to keep track of the beacon
2261                  * timers in order to detect automatic TSF updates.
2262                  */
2263                 ath5k_beaconq_config(sc);
2264
2265                 sc->imask |= AR5K_INT_SWBA;
2266
2267                 if (sc->opmode == NL80211_IFTYPE_ADHOC) {
2268                         if (ath5k_hw_hasveol(ah)) {
2269                                 spin_lock_irqsave(&sc->block, flags);
2270                                 ath5k_beacon_send(sc);
2271                                 spin_unlock_irqrestore(&sc->block, flags);
2272                         }
2273                 } else
2274                         ath5k_beacon_update_timers(sc, -1);
2275         }
2276
2277         ath5k_hw_set_imr(ah, sc->imask);
2278 }
2279
2280
2281 /********************\
2282 * Interrupt handling *
2283 \********************/
2284
2285 static int
2286 ath5k_init(struct ath5k_softc *sc)
2287 {
2288         struct ath5k_hw *ah = sc->ah;
2289         int ret, i;
2290
2291         mutex_lock(&sc->lock);
2292
2293         ATH5K_DBG(sc, ATH5K_DEBUG_RESET, "mode %d\n", sc->opmode);
2294
2295         /*
2296          * Stop anything previously setup.  This is safe
2297          * no matter this is the first time through or not.
2298          */
2299         ath5k_stop_locked(sc);
2300
2301         /*
2302          * The basic interface to setting the hardware in a good
2303          * state is ``reset''.  On return the hardware is known to
2304          * be powered up and with interrupts disabled.  This must
2305          * be followed by initialization of the appropriate bits
2306          * and then setup of the interrupt mask.
2307          */
2308         sc->curchan = sc->hw->conf.channel;
2309         sc->curband = &sc->sbands[sc->curchan->band];
2310         sc->imask = AR5K_INT_RXOK | AR5K_INT_RXERR | AR5K_INT_RXEOL |
2311                 AR5K_INT_RXORN | AR5K_INT_TXDESC | AR5K_INT_TXEOL |
2312                 AR5K_INT_FATAL | AR5K_INT_GLOBAL | AR5K_INT_MIB;
2313         ret = ath5k_reset(sc, false, false);
2314         if (ret)
2315                 goto done;
2316
2317         /*
2318          * Reset the key cache since some parts do not reset the
2319          * contents on initial power up or resume from suspend.
2320          */
2321         for (i = 0; i < AR5K_KEYTABLE_SIZE; i++)
2322                 ath5k_hw_reset_key(ah, i);
2323
2324         /* Set ack to be sent at low bit-rates */
2325         ath5k_hw_set_ack_bitrate_high(ah, false);
2326
2327         mod_timer(&sc->calib_tim, round_jiffies(jiffies +
2328                         msecs_to_jiffies(ath5k_calinterval * 1000)));
2329
2330         ret = 0;
2331 done:
2332         mmiowb();
2333         mutex_unlock(&sc->lock);
2334         return ret;
2335 }
2336
2337 static int
2338 ath5k_stop_locked(struct ath5k_softc *sc)
2339 {
2340         struct ath5k_hw *ah = sc->ah;
2341
2342         ATH5K_DBG(sc, ATH5K_DEBUG_RESET, "invalid %u\n",
2343                         test_bit(ATH_STAT_INVALID, sc->status));
2344
2345         /*
2346          * Shutdown the hardware and driver:
2347          *    stop output from above
2348          *    disable interrupts
2349          *    turn off timers
2350          *    turn off the radio
2351          *    clear transmit machinery
2352          *    clear receive machinery
2353          *    drain and release tx queues
2354          *    reclaim beacon resources
2355          *    power down hardware
2356          *
2357          * Note that some of this work is not possible if the
2358          * hardware is gone (invalid).
2359          */
2360         ieee80211_stop_queues(sc->hw);
2361
2362         if (!test_bit(ATH_STAT_INVALID, sc->status)) {
2363                 ath5k_led_off(sc);
2364                 ath5k_hw_set_imr(ah, 0);
2365                 synchronize_irq(sc->pdev->irq);
2366         }
2367         ath5k_txq_cleanup(sc);
2368         if (!test_bit(ATH_STAT_INVALID, sc->status)) {
2369                 ath5k_rx_stop(sc);
2370                 ath5k_hw_phy_disable(ah);
2371         } else
2372                 sc->rxlink = NULL;
2373
2374         return 0;
2375 }
2376
2377 /*
2378  * Stop the device, grabbing the top-level lock to protect
2379  * against concurrent entry through ath5k_init (which can happen
2380  * if another thread does a system call and the thread doing the
2381  * stop is preempted).
2382  */
2383 static int
2384 ath5k_stop_hw(struct ath5k_softc *sc)
2385 {
2386         int ret;
2387
2388         mutex_lock(&sc->lock);
2389         ret = ath5k_stop_locked(sc);
2390         if (ret == 0 && !test_bit(ATH_STAT_INVALID, sc->status)) {
2391                 /*
2392                  * Set the chip in full sleep mode.  Note that we are
2393                  * careful to do this only when bringing the interface
2394                  * completely to a stop.  When the chip is in this state
2395                  * it must be carefully woken up or references to
2396                  * registers in the PCI clock domain may freeze the bus
2397                  * (and system).  This varies by chip and is mostly an
2398                  * issue with newer parts that go to sleep more quickly.
2399                  */
2400                 if (sc->ah->ah_mac_srev >= 0x78) {
2401                         /*
2402                          * XXX
2403                          * don't put newer MAC revisions > 7.8 to sleep because
2404                          * of the above mentioned problems
2405                          */
2406                         ATH5K_DBG(sc, ATH5K_DEBUG_RESET, "mac version > 7.8, "
2407                                 "not putting device to sleep\n");
2408                 } else {
2409                         ATH5K_DBG(sc, ATH5K_DEBUG_RESET,
2410                                 "putting device to full sleep\n");
2411                         ath5k_hw_set_power(sc->ah, AR5K_PM_FULL_SLEEP, true, 0);
2412                 }
2413         }
2414         ath5k_txbuf_free(sc, sc->bbuf);
2415
2416         mmiowb();
2417         mutex_unlock(&sc->lock);
2418
2419         del_timer_sync(&sc->calib_tim);
2420         tasklet_kill(&sc->rxtq);
2421         tasklet_kill(&sc->txtq);
2422         tasklet_kill(&sc->restq);
2423         tasklet_kill(&sc->beacontq);
2424
2425         return ret;
2426 }
2427
2428 static irqreturn_t
2429 ath5k_intr(int irq, void *dev_id)
2430 {
2431         struct ath5k_softc *sc = dev_id;
2432         struct ath5k_hw *ah = sc->ah;
2433         enum ath5k_int status;
2434         unsigned int counter = 1000;
2435
2436         if (unlikely(test_bit(ATH_STAT_INVALID, sc->status) ||
2437                                 !ath5k_hw_is_intr_pending(ah)))
2438                 return IRQ_NONE;
2439
2440         do {
2441                 ath5k_hw_get_isr(ah, &status);          /* NB: clears IRQ too */
2442                 ATH5K_DBG(sc, ATH5K_DEBUG_INTR, "status 0x%x/0x%x\n",
2443                                 status, sc->imask);
2444                 if (unlikely(status & AR5K_INT_FATAL)) {
2445                         /*
2446                          * Fatal errors are unrecoverable.
2447                          * Typically these are caused by DMA errors.
2448                          */
2449                         tasklet_schedule(&sc->restq);
2450                 } else if (unlikely(status & AR5K_INT_RXORN)) {
2451                         tasklet_schedule(&sc->restq);
2452                 } else {
2453                         if (status & AR5K_INT_SWBA) {
2454                                 tasklet_schedule(&sc->beacontq);
2455                         }
2456                         if (status & AR5K_INT_RXEOL) {
2457                                 /*
2458                                 * NB: the hardware should re-read the link when
2459                                 *     RXE bit is written, but it doesn't work at
2460                                 *     least on older hardware revs.
2461                                 */
2462                                 sc->rxlink = NULL;
2463                         }
2464                         if (status & AR5K_INT_TXURN) {
2465                                 /* bump tx trigger level */
2466                                 ath5k_hw_update_tx_triglevel(ah, true);
2467                         }
2468                         if (status & (AR5K_INT_RXOK | AR5K_INT_RXERR))
2469                                 tasklet_schedule(&sc->rxtq);
2470                         if (status & (AR5K_INT_TXOK | AR5K_INT_TXDESC
2471                                         | AR5K_INT_TXERR | AR5K_INT_TXEOL))
2472                                 tasklet_schedule(&sc->txtq);
2473                         if (status & AR5K_INT_BMISS) {
2474                                 /* TODO */
2475                         }
2476                         if (status & AR5K_INT_MIB) {
2477                                 /*
2478                                  * These stats are also used for ANI i think
2479                                  * so how about updating them more often ?
2480                                  */
2481                                 ath5k_hw_update_mib_counters(ah, &sc->ll_stats);
2482                         }
2483                 }
2484         } while (ath5k_hw_is_intr_pending(ah) && counter-- > 0);
2485
2486         if (unlikely(!counter))
2487                 ATH5K_WARN(sc, "too many interrupts, giving up for now\n");
2488
2489         return IRQ_HANDLED;
2490 }
2491
2492 static void
2493 ath5k_tasklet_reset(unsigned long data)
2494 {
2495         struct ath5k_softc *sc = (void *)data;
2496
2497         ath5k_reset_wake(sc);
2498 }
2499
2500 /*
2501  * Periodically recalibrate the PHY to account
2502  * for temperature/environment changes.
2503  */
2504 static void
2505 ath5k_calibrate(unsigned long data)
2506 {
2507         struct ath5k_softc *sc = (void *)data;
2508         struct ath5k_hw *ah = sc->ah;
2509
2510         ATH5K_DBG(sc, ATH5K_DEBUG_CALIBRATE, "channel %u/%x\n",
2511                 ieee80211_frequency_to_channel(sc->curchan->center_freq),
2512                 sc->curchan->hw_value);
2513
2514         if (ath5k_hw_gainf_calibrate(ah) == AR5K_RFGAIN_NEED_CHANGE) {
2515                 /*
2516                  * Rfgain is out of bounds, reset the chip
2517                  * to load new gain values.
2518                  */
2519                 ATH5K_DBG(sc, ATH5K_DEBUG_RESET, "calibration, resetting\n");
2520                 ath5k_reset_wake(sc);
2521         }
2522         if (ath5k_hw_phy_calibrate(ah, sc->curchan))
2523                 ATH5K_ERR(sc, "calibration of channel %u failed\n",
2524                         ieee80211_frequency_to_channel(
2525                                 sc->curchan->center_freq));
2526
2527         mod_timer(&sc->calib_tim, round_jiffies(jiffies +
2528                         msecs_to_jiffies(ath5k_calinterval * 1000)));
2529 }
2530
2531
2532
2533 /***************\
2534 * LED functions *
2535 \***************/
2536
2537 static void
2538 ath5k_led_enable(struct ath5k_softc *sc)
2539 {
2540         if (test_bit(ATH_STAT_LEDSOFT, sc->status)) {
2541                 ath5k_hw_set_gpio_output(sc->ah, sc->led_pin);
2542                 ath5k_led_off(sc);
2543         }
2544 }
2545
2546 static void
2547 ath5k_led_on(struct ath5k_softc *sc)
2548 {
2549         if (!test_bit(ATH_STAT_LEDSOFT, sc->status))
2550                 return;
2551         ath5k_hw_set_gpio(sc->ah, sc->led_pin, sc->led_on);
2552 }
2553
2554 static void
2555 ath5k_led_off(struct ath5k_softc *sc)
2556 {
2557         if (!test_bit(ATH_STAT_LEDSOFT, sc->status))
2558                 return;
2559         ath5k_hw_set_gpio(sc->ah, sc->led_pin, !sc->led_on);
2560 }
2561
2562 static void
2563 ath5k_led_brightness_set(struct led_classdev *led_dev,
2564         enum led_brightness brightness)
2565 {
2566         struct ath5k_led *led = container_of(led_dev, struct ath5k_led,
2567                 led_dev);
2568
2569         if (brightness == LED_OFF)
2570                 ath5k_led_off(led->sc);
2571         else
2572                 ath5k_led_on(led->sc);
2573 }
2574
2575 static int
2576 ath5k_register_led(struct ath5k_softc *sc, struct ath5k_led *led,
2577                    const char *name, char *trigger)
2578 {
2579         int err;
2580
2581         led->sc = sc;
2582         strncpy(led->name, name, sizeof(led->name));
2583         led->led_dev.name = led->name;
2584         led->led_dev.default_trigger = trigger;
2585         led->led_dev.brightness_set = ath5k_led_brightness_set;
2586
2587         err = led_classdev_register(&sc->pdev->dev, &led->led_dev);
2588         if (err) {
2589                 ATH5K_WARN(sc, "could not register LED %s\n", name);
2590                 led->sc = NULL;
2591         }
2592         return err;
2593 }
2594
2595 static void
2596 ath5k_unregister_led(struct ath5k_led *led)
2597 {
2598         if (!led->sc)
2599                 return;
2600         led_classdev_unregister(&led->led_dev);
2601         ath5k_led_off(led->sc);
2602         led->sc = NULL;
2603 }
2604
2605 static void
2606 ath5k_unregister_leds(struct ath5k_softc *sc)
2607 {
2608         ath5k_unregister_led(&sc->rx_led);
2609         ath5k_unregister_led(&sc->tx_led);
2610 }
2611
2612
2613 static int
2614 ath5k_init_leds(struct ath5k_softc *sc)
2615 {
2616         int ret = 0;
2617         struct ieee80211_hw *hw = sc->hw;
2618         struct pci_dev *pdev = sc->pdev;
2619         char name[ATH5K_LED_MAX_NAME_LEN + 1];
2620
2621         /*
2622          * Auto-enable soft led processing for IBM cards and for
2623          * 5211 minipci cards.
2624          */
2625         if (pdev->device == PCI_DEVICE_ID_ATHEROS_AR5212_IBM ||
2626             pdev->device == PCI_DEVICE_ID_ATHEROS_AR5211) {
2627                 __set_bit(ATH_STAT_LEDSOFT, sc->status);
2628                 sc->led_pin = 0;
2629                 sc->led_on = 0;  /* active low */
2630         }
2631         /* Enable softled on PIN1 on HP Compaq nc6xx, nc4000 & nx5000 laptops */
2632         if (pdev->subsystem_vendor == PCI_VENDOR_ID_COMPAQ) {
2633                 __set_bit(ATH_STAT_LEDSOFT, sc->status);
2634                 sc->led_pin = 1;
2635                 sc->led_on = 1;  /* active high */
2636         }
2637         /*
2638          * Pin 3 on Foxconn chips used in Acer Aspire One (0x105b:e008) and
2639          * in emachines notebooks with AMBIT subsystem.
2640          */
2641         if (pdev->subsystem_vendor == PCI_VENDOR_ID_FOXCONN ||
2642             pdev->subsystem_vendor == PCI_VENDOR_ID_AMBIT) {
2643                 __set_bit(ATH_STAT_LEDSOFT, sc->status);
2644                 sc->led_pin = 3;
2645                 sc->led_on = 0;  /* active low */
2646         }
2647
2648         if (!test_bit(ATH_STAT_LEDSOFT, sc->status))
2649                 goto out;
2650
2651         ath5k_led_enable(sc);
2652
2653         snprintf(name, sizeof(name), "ath5k-%s::rx", wiphy_name(hw->wiphy));
2654         ret = ath5k_register_led(sc, &sc->rx_led, name,
2655                 ieee80211_get_rx_led_name(hw));
2656         if (ret)
2657                 goto out;
2658
2659         snprintf(name, sizeof(name), "ath5k-%s::tx", wiphy_name(hw->wiphy));
2660         ret = ath5k_register_led(sc, &sc->tx_led, name,
2661                 ieee80211_get_tx_led_name(hw));
2662 out:
2663         return ret;
2664 }
2665
2666
2667 /********************\
2668 * Mac80211 functions *
2669 \********************/
2670
2671 static int
2672 ath5k_tx(struct ieee80211_hw *hw, struct sk_buff *skb)
2673 {
2674         struct ath5k_softc *sc = hw->priv;
2675         struct ath5k_buf *bf;
2676         unsigned long flags;
2677         int hdrlen;
2678         int padsize;
2679
2680         ath5k_debug_dump_skb(sc, skb, "TX  ", 1);
2681
2682         if (sc->opmode == NL80211_IFTYPE_MONITOR)
2683                 ATH5K_DBG(sc, ATH5K_DEBUG_XMIT, "tx in monitor (scan?)\n");
2684
2685         /*
2686          * the hardware expects the header padded to 4 byte boundaries
2687          * if this is not the case we add the padding after the header
2688          */
2689         hdrlen = ieee80211_get_hdrlen_from_skb(skb);
2690         padsize = ath5k_pad_size(hdrlen);
2691         if (padsize) {
2692
2693                 if (skb_headroom(skb) < padsize) {
2694                         ATH5K_ERR(sc, "tx hdrlen not %%4: %d not enough"
2695                                   " headroom to pad %d\n", hdrlen, padsize);
2696                         return NETDEV_TX_BUSY;
2697                 }
2698                 skb_push(skb, padsize);
2699                 memmove(skb->data, skb->data+padsize, hdrlen);
2700         }
2701
2702         spin_lock_irqsave(&sc->txbuflock, flags);
2703         if (list_empty(&sc->txbuf)) {
2704                 ATH5K_ERR(sc, "no further txbuf available, dropping packet\n");
2705                 spin_unlock_irqrestore(&sc->txbuflock, flags);
2706                 ieee80211_stop_queue(hw, skb_get_queue_mapping(skb));
2707                 return NETDEV_TX_BUSY;
2708         }
2709         bf = list_first_entry(&sc->txbuf, struct ath5k_buf, list);
2710         list_del(&bf->list);
2711         sc->txbuf_len--;
2712         if (list_empty(&sc->txbuf))
2713                 ieee80211_stop_queues(hw);
2714         spin_unlock_irqrestore(&sc->txbuflock, flags);
2715
2716         bf->skb = skb;
2717
2718         if (ath5k_txbuf_setup(sc, bf)) {
2719                 bf->skb = NULL;
2720                 spin_lock_irqsave(&sc->txbuflock, flags);
2721                 list_add_tail(&bf->list, &sc->txbuf);
2722                 sc->txbuf_len++;
2723                 spin_unlock_irqrestore(&sc->txbuflock, flags);
2724                 dev_kfree_skb_any(skb);
2725                 return NETDEV_TX_OK;
2726         }
2727
2728         return NETDEV_TX_OK;
2729 }
2730
2731 static int
2732 ath5k_reset(struct ath5k_softc *sc, bool stop, bool change_channel)
2733 {
2734         struct ath5k_hw *ah = sc->ah;
2735         int ret;
2736
2737         ATH5K_DBG(sc, ATH5K_DEBUG_RESET, "resetting\n");
2738
2739         if (stop) {
2740                 ath5k_hw_set_imr(ah, 0);
2741                 ath5k_txq_cleanup(sc);
2742                 ath5k_rx_stop(sc);
2743         }
2744         ret = ath5k_hw_reset(ah, sc->opmode, sc->curchan, true);
2745         if (ret) {
2746                 ATH5K_ERR(sc, "can't reset hardware (%d)\n", ret);
2747                 goto err;
2748         }
2749
2750         /*
2751          * This is needed only to setup initial state
2752          * but it's best done after a reset.
2753          */
2754         ath5k_hw_set_txpower_limit(sc->ah, 0);
2755
2756         ret = ath5k_rx_start(sc);
2757         if (ret) {
2758                 ATH5K_ERR(sc, "can't start recv logic\n");
2759                 goto err;
2760         }
2761
2762         /*
2763          * Change channels and update the h/w rate map if we're switching;
2764          * e.g. 11a to 11b/g.
2765          *
2766          * We may be doing a reset in response to an ioctl that changes the
2767          * channel so update any state that might change as a result.
2768          *
2769          * XXX needed?
2770          */
2771 /*      ath5k_chan_change(sc, c); */
2772
2773         ath5k_beacon_config(sc);
2774         /* intrs are enabled by ath5k_beacon_config */
2775
2776         return 0;
2777 err:
2778         return ret;
2779 }
2780
2781 static int
2782 ath5k_reset_wake(struct ath5k_softc *sc)
2783 {
2784         int ret;
2785
2786         ret = ath5k_reset(sc, true, true);
2787         if (!ret)
2788                 ieee80211_wake_queues(sc->hw);
2789
2790         return ret;
2791 }
2792
2793 static int ath5k_start(struct ieee80211_hw *hw)
2794 {
2795         return ath5k_init(hw->priv);
2796 }
2797
2798 static void ath5k_stop(struct ieee80211_hw *hw)
2799 {
2800         ath5k_stop_hw(hw->priv);
2801 }
2802
2803 static int ath5k_add_interface(struct ieee80211_hw *hw,
2804                 struct ieee80211_if_init_conf *conf)
2805 {
2806         struct ath5k_softc *sc = hw->priv;
2807         int ret;
2808
2809         mutex_lock(&sc->lock);
2810         if (sc->vif) {
2811                 ret = 0;
2812                 goto end;
2813         }
2814
2815         sc->vif = conf->vif;
2816
2817         switch (conf->type) {
2818         case NL80211_IFTYPE_AP:
2819         case NL80211_IFTYPE_STATION:
2820         case NL80211_IFTYPE_ADHOC:
2821         case NL80211_IFTYPE_MESH_POINT:
2822         case NL80211_IFTYPE_MONITOR:
2823                 sc->opmode = conf->type;
2824                 break;
2825         default:
2826                 ret = -EOPNOTSUPP;
2827                 goto end;
2828         }
2829
2830         /* Set to a reasonable value. Note that this will
2831          * be set to mac80211's value at ath5k_config(). */
2832         sc->bintval = 1000;
2833         ath5k_hw_set_lladdr(sc->ah, conf->mac_addr);
2834
2835         ret = 0;
2836 end:
2837         mutex_unlock(&sc->lock);
2838         return ret;
2839 }
2840
2841 static void
2842 ath5k_remove_interface(struct ieee80211_hw *hw,
2843                         struct ieee80211_if_init_conf *conf)
2844 {
2845         struct ath5k_softc *sc = hw->priv;
2846         u8 mac[ETH_ALEN] = {};
2847
2848         mutex_lock(&sc->lock);
2849         if (sc->vif != conf->vif)
2850                 goto end;
2851
2852         ath5k_hw_set_lladdr(sc->ah, mac);
2853         sc->vif = NULL;
2854 end:
2855         mutex_unlock(&sc->lock);
2856 }
2857
2858 /*
2859  * TODO: Phy disable/diversity etc
2860  */
2861 static int
2862 ath5k_config(struct ieee80211_hw *hw, u32 changed)
2863 {
2864         struct ath5k_softc *sc = hw->priv;
2865         struct ieee80211_conf *conf = &hw->conf;
2866         int ret;
2867
2868         mutex_lock(&sc->lock);
2869
2870         sc->bintval = conf->beacon_int;
2871         sc->power_level = conf->power_level;
2872
2873         ret = ath5k_chan_set(sc, conf->channel);
2874
2875         mutex_unlock(&sc->lock);
2876         return ret;
2877 }
2878
2879 static int
2880 ath5k_config_interface(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2881                         struct ieee80211_if_conf *conf)
2882 {
2883         struct ath5k_softc *sc = hw->priv;
2884         struct ath5k_hw *ah = sc->ah;
2885         int ret = 0;
2886
2887         mutex_lock(&sc->lock);
2888         if (sc->vif != vif) {
2889                 ret = -EIO;
2890                 goto unlock;
2891         }
2892         if (conf->changed & IEEE80211_IFCC_BSSID && conf->bssid) {
2893                 /* Cache for later use during resets */
2894                 memcpy(ah->ah_bssid, conf->bssid, ETH_ALEN);
2895                 /* XXX: assoc id is set to 0 for now, mac80211 doesn't have
2896                  * a clean way of letting us retrieve this yet. */
2897                 ath5k_hw_set_associd(ah, ah->ah_bssid, 0);
2898                 mmiowb();
2899         }
2900         if (conf->changed & IEEE80211_IFCC_BEACON &&
2901                         (vif->type == NL80211_IFTYPE_ADHOC ||
2902                          vif->type == NL80211_IFTYPE_MESH_POINT ||
2903                          vif->type == NL80211_IFTYPE_AP)) {
2904                 struct sk_buff *beacon = ieee80211_beacon_get(hw, vif);
2905                 if (!beacon) {
2906                         ret = -ENOMEM;
2907                         goto unlock;
2908                 }
2909                 ath5k_beacon_update(sc, beacon);
2910         }
2911
2912 unlock:
2913         mutex_unlock(&sc->lock);
2914         return ret;
2915 }
2916
2917 #define SUPPORTED_FIF_FLAGS \
2918         FIF_PROMISC_IN_BSS |  FIF_ALLMULTI | FIF_FCSFAIL | \
2919         FIF_PLCPFAIL | FIF_CONTROL | FIF_OTHER_BSS | \
2920         FIF_BCN_PRBRESP_PROMISC
2921 /*
2922  * o always accept unicast, broadcast, and multicast traffic
2923  * o multicast traffic for all BSSIDs will be enabled if mac80211
2924  *   says it should be
2925  * o maintain current state of phy ofdm or phy cck error reception.
2926  *   If the hardware detects any of these type of errors then
2927  *   ath5k_hw_get_rx_filter() will pass to us the respective
2928  *   hardware filters to be able to receive these type of frames.
2929  * o probe request frames are accepted only when operating in
2930  *   hostap, adhoc, or monitor modes
2931  * o enable promiscuous mode according to the interface state
2932  * o accept beacons:
2933  *   - when operating in adhoc mode so the 802.11 layer creates
2934  *     node table entries for peers,
2935  *   - when operating in station mode for collecting rssi data when
2936  *     the station is otherwise quiet, or
2937  *   - when scanning
2938  */
2939 static void ath5k_configure_filter(struct ieee80211_hw *hw,
2940                 unsigned int changed_flags,
2941                 unsigned int *new_flags,
2942                 int mc_count, struct dev_mc_list *mclist)
2943 {
2944         struct ath5k_softc *sc = hw->priv;
2945         struct ath5k_hw *ah = sc->ah;
2946         u32 mfilt[2], val, rfilt;
2947         u8 pos;
2948         int i;
2949
2950         mfilt[0] = 0;
2951         mfilt[1] = 0;
2952
2953         /* Only deal with supported flags */
2954         changed_flags &= SUPPORTED_FIF_FLAGS;
2955         *new_flags &= SUPPORTED_FIF_FLAGS;
2956
2957         /* If HW detects any phy or radar errors, leave those filters on.
2958          * Also, always enable Unicast, Broadcasts and Multicast
2959          * XXX: move unicast, bssid broadcasts and multicast to mac80211 */
2960         rfilt = (ath5k_hw_get_rx_filter(ah) & (AR5K_RX_FILTER_PHYERR)) |
2961                 (AR5K_RX_FILTER_UCAST | AR5K_RX_FILTER_BCAST |
2962                 AR5K_RX_FILTER_MCAST);
2963
2964         if (changed_flags & (FIF_PROMISC_IN_BSS | FIF_OTHER_BSS)) {
2965                 if (*new_flags & FIF_PROMISC_IN_BSS) {
2966                         rfilt |= AR5K_RX_FILTER_PROM;
2967                         __set_bit(ATH_STAT_PROMISC, sc->status);
2968                 } else {
2969                         __clear_bit(ATH_STAT_PROMISC, sc->status);
2970                 }
2971         }
2972
2973         /* Note, AR5K_RX_FILTER_MCAST is already enabled */
2974         if (*new_flags & FIF_ALLMULTI) {
2975                 mfilt[0] =  ~0;
2976                 mfilt[1] =  ~0;
2977         } else {
2978                 for (i = 0; i < mc_count; i++) {
2979                         if (!mclist)
2980                                 break;
2981                         /* calculate XOR of eight 6-bit values */
2982                         val = get_unaligned_le32(mclist->dmi_addr + 0);
2983                         pos = (val >> 18) ^ (val >> 12) ^ (val >> 6) ^ val;
2984                         val = get_unaligned_le32(mclist->dmi_addr + 3);
2985                         pos ^= (val >> 18) ^ (val >> 12) ^ (val >> 6) ^ val;
2986                         pos &= 0x3f;
2987                         mfilt[pos / 32] |= (1 << (pos % 32));
2988                         /* XXX: we might be able to just do this instead,
2989                         * but not sure, needs testing, if we do use this we'd
2990                         * neet to inform below to not reset the mcast */
2991                         /* ath5k_hw_set_mcast_filterindex(ah,
2992                          *      mclist->dmi_addr[5]); */
2993                         mclist = mclist->next;
2994                 }
2995         }
2996
2997         /* This is the best we can do */
2998         if (*new_flags & (FIF_FCSFAIL | FIF_PLCPFAIL))
2999                 rfilt |= AR5K_RX_FILTER_PHYERR;
3000
3001         /* FIF_BCN_PRBRESP_PROMISC really means to enable beacons
3002         * and probes for any BSSID, this needs testing */
3003         if (*new_flags & FIF_BCN_PRBRESP_PROMISC)
3004                 rfilt |= AR5K_RX_FILTER_BEACON | AR5K_RX_FILTER_PROBEREQ;
3005
3006         /* FIF_CONTROL doc says that if FIF_PROMISC_IN_BSS is not
3007          * set we should only pass on control frames for this
3008          * station. This needs testing. I believe right now this
3009          * enables *all* control frames, which is OK.. but
3010          * but we should see if we can improve on granularity */
3011         if (*new_flags & FIF_CONTROL)
3012                 rfilt |= AR5K_RX_FILTER_CONTROL;
3013
3014         /* Additional settings per mode -- this is per ath5k */
3015
3016         /* XXX move these to mac80211, and add a beacon IFF flag to mac80211 */
3017
3018         if (sc->opmode == NL80211_IFTYPE_MONITOR)
3019                 rfilt |= AR5K_RX_FILTER_CONTROL | AR5K_RX_FILTER_BEACON |
3020                         AR5K_RX_FILTER_PROBEREQ | AR5K_RX_FILTER_PROM;
3021         if (sc->opmode != NL80211_IFTYPE_STATION)
3022                 rfilt |= AR5K_RX_FILTER_PROBEREQ;
3023         if (sc->opmode != NL80211_IFTYPE_AP &&
3024                 sc->opmode != NL80211_IFTYPE_MESH_POINT &&
3025                 test_bit(ATH_STAT_PROMISC, sc->status))
3026                 rfilt |= AR5K_RX_FILTER_PROM;
3027         if ((sc->opmode == NL80211_IFTYPE_STATION && sc->assoc) ||
3028                 sc->opmode == NL80211_IFTYPE_ADHOC ||
3029                 sc->opmode == NL80211_IFTYPE_AP)
3030                 rfilt |= AR5K_RX_FILTER_BEACON;
3031         if (sc->opmode == NL80211_IFTYPE_MESH_POINT)
3032                 rfilt |= AR5K_RX_FILTER_CONTROL | AR5K_RX_FILTER_BEACON |
3033                         AR5K_RX_FILTER_PROBEREQ | AR5K_RX_FILTER_PROM;
3034
3035         /* Set filters */
3036         ath5k_hw_set_rx_filter(ah, rfilt);
3037
3038         /* Set multicast bits */
3039         ath5k_hw_set_mcast_filter(ah, mfilt[0], mfilt[1]);
3040         /* Set the cached hw filter flags, this will alter actually
3041          * be set in HW */
3042         sc->filter_flags = rfilt;
3043 }
3044
3045 static int
3046 ath5k_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
3047               struct ieee80211_vif *vif, struct ieee80211_sta *sta,
3048               struct ieee80211_key_conf *key)
3049 {
3050         struct ath5k_softc *sc = hw->priv;
3051         int ret = 0;
3052
3053         if (modparam_nohwcrypt)
3054                 return -EOPNOTSUPP;
3055
3056         switch (key->alg) {
3057         case ALG_WEP:
3058         case ALG_TKIP:
3059                 break;
3060         case ALG_CCMP:
3061                 return -EOPNOTSUPP;
3062         default:
3063                 WARN_ON(1);
3064                 return -EINVAL;
3065         }
3066
3067         mutex_lock(&sc->lock);
3068
3069         switch (cmd) {
3070         case SET_KEY:
3071                 ret = ath5k_hw_set_key(sc->ah, key->keyidx, key,
3072                                        sta ? sta->addr : NULL);
3073                 if (ret) {
3074                         ATH5K_ERR(sc, "can't set the key\n");
3075                         goto unlock;
3076                 }
3077                 __set_bit(key->keyidx, sc->keymap);
3078                 key->hw_key_idx = key->keyidx;
3079                 key->flags |= (IEEE80211_KEY_FLAG_GENERATE_IV |
3080                                IEEE80211_KEY_FLAG_GENERATE_MMIC);
3081                 break;
3082         case DISABLE_KEY:
3083                 ath5k_hw_reset_key(sc->ah, key->keyidx);
3084                 __clear_bit(key->keyidx, sc->keymap);
3085                 break;
3086         default:
3087                 ret = -EINVAL;
3088                 goto unlock;
3089         }
3090
3091 unlock:
3092         mmiowb();
3093         mutex_unlock(&sc->lock);
3094         return ret;
3095 }
3096
3097 static int
3098 ath5k_get_stats(struct ieee80211_hw *hw,
3099                 struct ieee80211_low_level_stats *stats)
3100 {
3101         struct ath5k_softc *sc = hw->priv;
3102         struct ath5k_hw *ah = sc->ah;
3103
3104         /* Force update */
3105         ath5k_hw_update_mib_counters(ah, &sc->ll_stats);
3106
3107         memcpy(stats, &sc->ll_stats, sizeof(sc->ll_stats));
3108
3109         return 0;
3110 }
3111
3112 static int
3113 ath5k_get_tx_stats(struct ieee80211_hw *hw,
3114                 struct ieee80211_tx_queue_stats *stats)
3115 {
3116         struct ath5k_softc *sc = hw->priv;
3117
3118         memcpy(stats, &sc->tx_stats, sizeof(sc->tx_stats));
3119
3120         return 0;
3121 }
3122
3123 static u64
3124 ath5k_get_tsf(struct ieee80211_hw *hw)
3125 {
3126         struct ath5k_softc *sc = hw->priv;
3127
3128         return ath5k_hw_get_tsf64(sc->ah);
3129 }
3130
3131 static void
3132 ath5k_set_tsf(struct ieee80211_hw *hw, u64 tsf)
3133 {
3134         struct ath5k_softc *sc = hw->priv;
3135
3136         ath5k_hw_set_tsf64(sc->ah, tsf);
3137 }
3138
3139 static void
3140 ath5k_reset_tsf(struct ieee80211_hw *hw)
3141 {
3142         struct ath5k_softc *sc = hw->priv;
3143
3144         /*
3145          * in IBSS mode we need to update the beacon timers too.
3146          * this will also reset the TSF if we call it with 0
3147          */
3148         if (sc->opmode == NL80211_IFTYPE_ADHOC)
3149                 ath5k_beacon_update_timers(sc, 0);
3150         else
3151                 ath5k_hw_reset_tsf(sc->ah);
3152 }
3153
3154 static int
3155 ath5k_beacon_update(struct ath5k_softc *sc, struct sk_buff *skb)
3156 {
3157         unsigned long flags;
3158         int ret;
3159
3160         ath5k_debug_dump_skb(sc, skb, "BC  ", 1);
3161
3162         spin_lock_irqsave(&sc->block, flags);
3163         ath5k_txbuf_free(sc, sc->bbuf);
3164         sc->bbuf->skb = skb;
3165         ret = ath5k_beacon_setup(sc, sc->bbuf);
3166         if (ret)
3167                 sc->bbuf->skb = NULL;
3168         spin_unlock_irqrestore(&sc->block, flags);
3169         if (!ret) {
3170                 ath5k_beacon_config(sc);
3171                 mmiowb();
3172         }
3173
3174         return ret;
3175 }
3176 static void
3177 set_beacon_filter(struct ieee80211_hw *hw, bool enable)
3178 {
3179         struct ath5k_softc *sc = hw->priv;
3180         struct ath5k_hw *ah = sc->ah;
3181         u32 rfilt;
3182         rfilt = ath5k_hw_get_rx_filter(ah);
3183         if (enable)
3184                 rfilt |= AR5K_RX_FILTER_BEACON;
3185         else
3186                 rfilt &= ~AR5K_RX_FILTER_BEACON;
3187         ath5k_hw_set_rx_filter(ah, rfilt);
3188         sc->filter_flags = rfilt;
3189 }
3190
3191 static void ath5k_bss_info_changed(struct ieee80211_hw *hw,
3192                                     struct ieee80211_vif *vif,
3193                                     struct ieee80211_bss_conf *bss_conf,
3194                                     u32 changes)
3195 {
3196         struct ath5k_softc *sc = hw->priv;
3197         if (changes & BSS_CHANGED_ASSOC) {
3198                 mutex_lock(&sc->lock);
3199                 sc->assoc = bss_conf->assoc;
3200                 if (sc->opmode == NL80211_IFTYPE_STATION)
3201                         set_beacon_filter(hw, sc->assoc);
3202                 mutex_unlock(&sc->lock);
3203         }
3204 }