Commit | Line | Data |
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ef1a628d MB |
1 | /* |
2 | ||
3 | Broadcom B43 wireless driver | |
4 | Common PHY routines | |
5 | ||
6 | Copyright (c) 2005 Martin Langer <martin-langer@gmx.de>, | |
7 | Copyright (c) 2005-2007 Stefano Brivio <stefano.brivio@polimi.it> | |
eb032b98 | 8 | Copyright (c) 2005-2008 Michael Buesch <m@bues.ch> |
ef1a628d MB |
9 | Copyright (c) 2005, 2006 Danny van Dyk <kugelfang@gentoo.org> |
10 | Copyright (c) 2005, 2006 Andreas Jaggi <andreas.jaggi@waterwave.ch> | |
11 | ||
12 | This program is free software; you can redistribute it and/or modify | |
13 | it under the terms of the GNU General Public License as published by | |
14 | the Free Software Foundation; either version 2 of the License, or | |
15 | (at your option) any later version. | |
16 | ||
17 | This program is distributed in the hope that it will be useful, | |
18 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | GNU General Public License for more details. | |
21 | ||
22 | You should have received a copy of the GNU General Public License | |
23 | along with this program; see the file COPYING. If not, write to | |
24 | the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor, | |
25 | Boston, MA 02110-1301, USA. | |
26 | ||
27 | */ | |
28 | ||
29 | #include "phy_common.h" | |
30 | #include "phy_g.h" | |
31 | #include "phy_a.h" | |
3d0da751 | 32 | #include "phy_n.h" |
e63e4363 | 33 | #include "phy_lp.h" |
d7520b1d | 34 | #include "phy_ht.h" |
58eb7ff3 | 35 | #include "phy_lcn.h" |
ef1a628d MB |
36 | #include "b43.h" |
37 | #include "main.h" | |
38 | ||
39 | ||
fb11137a | 40 | int b43_phy_allocate(struct b43_wldev *dev) |
ef1a628d MB |
41 | { |
42 | struct b43_phy *phy = &(dev->phy); | |
43 | int err; | |
44 | ||
45 | phy->ops = NULL; | |
46 | ||
47 | switch (phy->type) { | |
48 | case B43_PHYTYPE_A: | |
49 | phy->ops = &b43_phyops_a; | |
50 | break; | |
51 | case B43_PHYTYPE_G: | |
52 | phy->ops = &b43_phyops_g; | |
53 | break; | |
54 | case B43_PHYTYPE_N: | |
692d2c0f | 55 | #ifdef CONFIG_B43_PHY_N |
ef1a628d MB |
56 | phy->ops = &b43_phyops_n; |
57 | #endif | |
58 | break; | |
59 | case B43_PHYTYPE_LP: | |
e63e4363 MB |
60 | #ifdef CONFIG_B43_PHY_LP |
61 | phy->ops = &b43_phyops_lp; | |
d7520b1d RM |
62 | #endif |
63 | break; | |
64 | case B43_PHYTYPE_HT: | |
65 | #ifdef CONFIG_B43_PHY_HT | |
66 | phy->ops = &b43_phyops_ht; | |
58eb7ff3 RM |
67 | #endif |
68 | break; | |
69 | case B43_PHYTYPE_LCN: | |
70 | #ifdef CONFIG_B43_PHY_LCN | |
71 | phy->ops = &b43_phyops_lcn; | |
e63e4363 | 72 | #endif |
ef1a628d MB |
73 | break; |
74 | } | |
75 | if (B43_WARN_ON(!phy->ops)) | |
76 | return -ENODEV; | |
77 | ||
78 | err = phy->ops->allocate(dev); | |
79 | if (err) | |
80 | phy->ops = NULL; | |
81 | ||
82 | return err; | |
83 | } | |
84 | ||
fb11137a MB |
85 | void b43_phy_free(struct b43_wldev *dev) |
86 | { | |
87 | dev->phy.ops->free(dev); | |
88 | dev->phy.ops = NULL; | |
89 | } | |
90 | ||
ef1a628d MB |
91 | int b43_phy_init(struct b43_wldev *dev) |
92 | { | |
93 | struct b43_phy *phy = &dev->phy; | |
94 | const struct b43_phy_operations *ops = phy->ops; | |
95 | int err; | |
96 | ||
97 | phy->channel = ops->get_default_chan(dev); | |
98 | ||
19d337df | 99 | ops->software_rfkill(dev, false); |
ef1a628d MB |
100 | err = ops->init(dev); |
101 | if (err) { | |
102 | b43err(dev->wl, "PHY init failed\n"); | |
103 | goto err_block_rf; | |
104 | } | |
105 | /* Make sure to switch hardware and firmware (SHM) to | |
106 | * the default channel. */ | |
107 | err = b43_switch_channel(dev, ops->get_default_chan(dev)); | |
108 | if (err) { | |
109 | b43err(dev->wl, "PHY init: Channel switch to default failed\n"); | |
110 | goto err_phy_exit; | |
111 | } | |
112 | ||
113 | return 0; | |
114 | ||
115 | err_phy_exit: | |
116 | if (ops->exit) | |
117 | ops->exit(dev); | |
118 | err_block_rf: | |
19d337df | 119 | ops->software_rfkill(dev, true); |
ef1a628d MB |
120 | |
121 | return err; | |
122 | } | |
123 | ||
124 | void b43_phy_exit(struct b43_wldev *dev) | |
125 | { | |
126 | const struct b43_phy_operations *ops = dev->phy.ops; | |
127 | ||
19d337df | 128 | ops->software_rfkill(dev, true); |
ef1a628d MB |
129 | if (ops->exit) |
130 | ops->exit(dev); | |
131 | } | |
132 | ||
133 | bool b43_has_hardware_pctl(struct b43_wldev *dev) | |
134 | { | |
135 | if (!dev->phy.hardware_power_control) | |
1a2b250b | 136 | return false; |
ef1a628d | 137 | if (!dev->phy.ops->supports_hwpctl) |
1a2b250b | 138 | return false; |
ef1a628d MB |
139 | return dev->phy.ops->supports_hwpctl(dev); |
140 | } | |
141 | ||
142 | void b43_radio_lock(struct b43_wldev *dev) | |
143 | { | |
144 | u32 macctl; | |
145 | ||
591f3dc2 MB |
146 | #if B43_DEBUG |
147 | B43_WARN_ON(dev->phy.radio_locked); | |
3db1cd5c | 148 | dev->phy.radio_locked = true; |
591f3dc2 MB |
149 | #endif |
150 | ||
ef1a628d | 151 | macctl = b43_read32(dev, B43_MMIO_MACCTL); |
ef1a628d MB |
152 | macctl |= B43_MACCTL_RADIOLOCK; |
153 | b43_write32(dev, B43_MMIO_MACCTL, macctl); | |
591f3dc2 MB |
154 | /* Commit the write and wait for the firmware |
155 | * to finish any radio register access. */ | |
ef1a628d MB |
156 | b43_read32(dev, B43_MMIO_MACCTL); |
157 | udelay(10); | |
158 | } | |
159 | ||
160 | void b43_radio_unlock(struct b43_wldev *dev) | |
161 | { | |
162 | u32 macctl; | |
163 | ||
591f3dc2 MB |
164 | #if B43_DEBUG |
165 | B43_WARN_ON(!dev->phy.radio_locked); | |
3db1cd5c | 166 | dev->phy.radio_locked = false; |
591f3dc2 MB |
167 | #endif |
168 | ||
ef1a628d MB |
169 | /* Commit any write */ |
170 | b43_read16(dev, B43_MMIO_PHY_VER); | |
171 | /* unlock */ | |
172 | macctl = b43_read32(dev, B43_MMIO_MACCTL); | |
ef1a628d MB |
173 | macctl &= ~B43_MACCTL_RADIOLOCK; |
174 | b43_write32(dev, B43_MMIO_MACCTL, macctl); | |
175 | } | |
176 | ||
177 | void b43_phy_lock(struct b43_wldev *dev) | |
178 | { | |
179 | #if B43_DEBUG | |
180 | B43_WARN_ON(dev->phy.phy_locked); | |
3db1cd5c | 181 | dev->phy.phy_locked = true; |
ef1a628d | 182 | #endif |
21d889d4 | 183 | B43_WARN_ON(dev->dev->core_rev < 3); |
ef1a628d | 184 | |
05c914fe | 185 | if (!b43_is_mode(dev->wl, NL80211_IFTYPE_AP)) |
ef1a628d MB |
186 | b43_power_saving_ctl_bits(dev, B43_PS_AWAKE); |
187 | } | |
188 | ||
189 | void b43_phy_unlock(struct b43_wldev *dev) | |
190 | { | |
191 | #if B43_DEBUG | |
192 | B43_WARN_ON(!dev->phy.phy_locked); | |
3db1cd5c | 193 | dev->phy.phy_locked = false; |
ef1a628d | 194 | #endif |
21d889d4 | 195 | B43_WARN_ON(dev->dev->core_rev < 3); |
ef1a628d | 196 | |
05c914fe | 197 | if (!b43_is_mode(dev->wl, NL80211_IFTYPE_AP)) |
ef1a628d MB |
198 | b43_power_saving_ctl_bits(dev, 0); |
199 | } | |
200 | ||
d10d0e57 MB |
201 | static inline void assert_mac_suspended(struct b43_wldev *dev) |
202 | { | |
203 | if (!B43_DEBUG) | |
204 | return; | |
205 | if ((b43_status(dev) >= B43_STAT_INITIALIZED) && | |
206 | (dev->mac_suspended <= 0)) { | |
207 | b43dbg(dev->wl, "PHY/RADIO register access with " | |
208 | "enabled MAC.\n"); | |
209 | dump_stack(); | |
210 | } | |
211 | } | |
212 | ||
ef1a628d MB |
213 | u16 b43_radio_read(struct b43_wldev *dev, u16 reg) |
214 | { | |
d10d0e57 | 215 | assert_mac_suspended(dev); |
ef1a628d MB |
216 | return dev->phy.ops->radio_read(dev, reg); |
217 | } | |
218 | ||
219 | void b43_radio_write(struct b43_wldev *dev, u16 reg, u16 value) | |
220 | { | |
d10d0e57 | 221 | assert_mac_suspended(dev); |
ef1a628d MB |
222 | dev->phy.ops->radio_write(dev, reg, value); |
223 | } | |
224 | ||
225 | void b43_radio_mask(struct b43_wldev *dev, u16 offset, u16 mask) | |
226 | { | |
227 | b43_radio_write16(dev, offset, | |
228 | b43_radio_read16(dev, offset) & mask); | |
229 | } | |
230 | ||
231 | void b43_radio_set(struct b43_wldev *dev, u16 offset, u16 set) | |
232 | { | |
233 | b43_radio_write16(dev, offset, | |
234 | b43_radio_read16(dev, offset) | set); | |
235 | } | |
236 | ||
237 | void b43_radio_maskset(struct b43_wldev *dev, u16 offset, u16 mask, u16 set) | |
238 | { | |
239 | b43_radio_write16(dev, offset, | |
240 | (b43_radio_read16(dev, offset) & mask) | set); | |
241 | } | |
242 | ||
0f941777 RM |
243 | bool b43_radio_wait_value(struct b43_wldev *dev, u16 offset, u16 mask, |
244 | u16 value, int delay, int timeout) | |
245 | { | |
246 | u16 val; | |
247 | int i; | |
248 | ||
249 | for (i = 0; i < timeout; i += delay) { | |
250 | val = b43_radio_read(dev, offset); | |
251 | if ((val & mask) == value) | |
252 | return true; | |
253 | udelay(delay); | |
254 | } | |
255 | return false; | |
256 | } | |
257 | ||
ef1a628d MB |
258 | u16 b43_phy_read(struct b43_wldev *dev, u16 reg) |
259 | { | |
d10d0e57 | 260 | assert_mac_suspended(dev); |
15518080 | 261 | dev->phy.writes_counter = 0; |
ef1a628d MB |
262 | return dev->phy.ops->phy_read(dev, reg); |
263 | } | |
264 | ||
265 | void b43_phy_write(struct b43_wldev *dev, u16 reg, u16 value) | |
266 | { | |
d10d0e57 | 267 | assert_mac_suspended(dev); |
ef1a628d | 268 | dev->phy.ops->phy_write(dev, reg, value); |
15518080 RM |
269 | if (++dev->phy.writes_counter == B43_MAX_WRITES_IN_ROW) { |
270 | b43_read16(dev, B43_MMIO_PHY_VER); | |
271 | dev->phy.writes_counter = 0; | |
272 | } | |
ef1a628d MB |
273 | } |
274 | ||
738f0f43 GS |
275 | void b43_phy_copy(struct b43_wldev *dev, u16 destreg, u16 srcreg) |
276 | { | |
277 | assert_mac_suspended(dev); | |
278 | dev->phy.ops->phy_write(dev, destreg, | |
279 | dev->phy.ops->phy_read(dev, srcreg)); | |
280 | } | |
281 | ||
ef1a628d MB |
282 | void b43_phy_mask(struct b43_wldev *dev, u16 offset, u16 mask) |
283 | { | |
68ec5329 GS |
284 | if (dev->phy.ops->phy_maskset) { |
285 | assert_mac_suspended(dev); | |
286 | dev->phy.ops->phy_maskset(dev, offset, mask, 0); | |
287 | } else { | |
288 | b43_phy_write(dev, offset, | |
289 | b43_phy_read(dev, offset) & mask); | |
290 | } | |
ef1a628d MB |
291 | } |
292 | ||
293 | void b43_phy_set(struct b43_wldev *dev, u16 offset, u16 set) | |
294 | { | |
68ec5329 GS |
295 | if (dev->phy.ops->phy_maskset) { |
296 | assert_mac_suspended(dev); | |
297 | dev->phy.ops->phy_maskset(dev, offset, 0xFFFF, set); | |
298 | } else { | |
299 | b43_phy_write(dev, offset, | |
300 | b43_phy_read(dev, offset) | set); | |
301 | } | |
ef1a628d MB |
302 | } |
303 | ||
304 | void b43_phy_maskset(struct b43_wldev *dev, u16 offset, u16 mask, u16 set) | |
305 | { | |
68ec5329 GS |
306 | if (dev->phy.ops->phy_maskset) { |
307 | assert_mac_suspended(dev); | |
308 | dev->phy.ops->phy_maskset(dev, offset, mask, set); | |
309 | } else { | |
310 | b43_phy_write(dev, offset, | |
311 | (b43_phy_read(dev, offset) & mask) | set); | |
312 | } | |
ef1a628d MB |
313 | } |
314 | ||
315 | int b43_switch_channel(struct b43_wldev *dev, unsigned int new_channel) | |
316 | { | |
317 | struct b43_phy *phy = &(dev->phy); | |
318 | u16 channelcookie, savedcookie; | |
319 | int err; | |
320 | ||
321 | if (new_channel == B43_DEFAULT_CHANNEL) | |
322 | new_channel = phy->ops->get_default_chan(dev); | |
323 | ||
324 | /* First we set the channel radio code to prevent the | |
325 | * firmware from sending ghost packets. | |
326 | */ | |
327 | channelcookie = new_channel; | |
328 | if (b43_current_band(dev->wl) == IEEE80211_BAND_5GHZ) | |
106cb09a RM |
329 | channelcookie |= B43_SHM_SH_CHAN_5GHZ; |
330 | /* FIXME: set 40Mhz flag if required */ | |
331 | if (0) | |
332 | channelcookie |= B43_SHM_SH_CHAN_40MHZ; | |
ef1a628d MB |
333 | savedcookie = b43_shm_read16(dev, B43_SHM_SHARED, B43_SHM_SH_CHAN); |
334 | b43_shm_write16(dev, B43_SHM_SHARED, B43_SHM_SH_CHAN, channelcookie); | |
335 | ||
336 | /* Now try to switch the PHY hardware channel. */ | |
337 | err = phy->ops->switch_channel(dev, new_channel); | |
338 | if (err) | |
339 | goto err_restore_cookie; | |
340 | ||
341 | dev->phy.channel = new_channel; | |
342 | /* Wait for the radio to tune to the channel and stabilize. */ | |
343 | msleep(8); | |
344 | ||
345 | return 0; | |
346 | ||
347 | err_restore_cookie: | |
348 | b43_shm_write16(dev, B43_SHM_SHARED, | |
349 | B43_SHM_SH_CHAN, savedcookie); | |
350 | ||
351 | return err; | |
352 | } | |
353 | ||
19d337df | 354 | void b43_software_rfkill(struct b43_wldev *dev, bool blocked) |
ef1a628d MB |
355 | { |
356 | struct b43_phy *phy = &dev->phy; | |
357 | ||
b929ecf7 | 358 | b43_mac_suspend(dev); |
19d337df JB |
359 | phy->ops->software_rfkill(dev, blocked); |
360 | phy->radio_on = !blocked; | |
b929ecf7 | 361 | b43_mac_enable(dev); |
ef1a628d | 362 | } |
18c8adeb MB |
363 | |
364 | /** | |
365 | * b43_phy_txpower_adjust_work - TX power workqueue. | |
366 | * | |
367 | * Workqueue for updating the TX power parameters in hardware. | |
368 | */ | |
369 | void b43_phy_txpower_adjust_work(struct work_struct *work) | |
370 | { | |
371 | struct b43_wl *wl = container_of(work, struct b43_wl, | |
372 | txpower_adjust_work); | |
373 | struct b43_wldev *dev; | |
374 | ||
375 | mutex_lock(&wl->mutex); | |
376 | dev = wl->current_dev; | |
377 | ||
378 | if (likely(dev && (b43_status(dev) >= B43_STAT_STARTED))) | |
379 | dev->phy.ops->adjust_txpower(dev); | |
380 | ||
381 | mutex_unlock(&wl->mutex); | |
382 | } | |
383 | ||
18c8adeb MB |
384 | void b43_phy_txpower_check(struct b43_wldev *dev, unsigned int flags) |
385 | { | |
386 | struct b43_phy *phy = &dev->phy; | |
387 | unsigned long now = jiffies; | |
388 | enum b43_txpwr_result result; | |
389 | ||
390 | if (!(flags & B43_TXPWR_IGNORE_TIME)) { | |
391 | /* Check if it's time for a TXpower check. */ | |
392 | if (time_before(now, phy->next_txpwr_check_time)) | |
393 | return; /* Not yet */ | |
394 | } | |
395 | /* The next check will be needed in two seconds, or later. */ | |
396 | phy->next_txpwr_check_time = round_jiffies(now + (HZ * 2)); | |
397 | ||
79d2232f RM |
398 | if ((dev->dev->board_vendor == SSB_BOARDVENDOR_BCM) && |
399 | (dev->dev->board_type == SSB_BOARD_BU4306)) | |
18c8adeb MB |
400 | return; /* No software txpower adjustment needed */ |
401 | ||
402 | result = phy->ops->recalc_txpower(dev, !!(flags & B43_TXPWR_IGNORE_TSSI)); | |
403 | if (result == B43_TXPWR_RES_DONE) | |
404 | return; /* We are done. */ | |
405 | B43_WARN_ON(result != B43_TXPWR_RES_NEED_ADJUST); | |
406 | B43_WARN_ON(phy->ops->adjust_txpower == NULL); | |
407 | ||
408 | /* We must adjust the transmission power in hardware. | |
409 | * Schedule b43_phy_txpower_adjust_work(). */ | |
42935eca | 410 | ieee80211_queue_work(dev->wl->hw, &dev->wl->txpower_adjust_work); |
18c8adeb MB |
411 | } |
412 | ||
413 | int b43_phy_shm_tssi_read(struct b43_wldev *dev, u16 shm_offset) | |
414 | { | |
415 | const bool is_ofdm = (shm_offset != B43_SHM_SH_TSSI_CCK); | |
416 | unsigned int a, b, c, d; | |
417 | unsigned int average; | |
418 | u32 tmp; | |
419 | ||
420 | tmp = b43_shm_read32(dev, B43_SHM_SHARED, shm_offset); | |
421 | a = tmp & 0xFF; | |
422 | b = (tmp >> 8) & 0xFF; | |
423 | c = (tmp >> 16) & 0xFF; | |
424 | d = (tmp >> 24) & 0xFF; | |
425 | if (a == 0 || a == B43_TSSI_MAX || | |
426 | b == 0 || b == B43_TSSI_MAX || | |
427 | c == 0 || c == B43_TSSI_MAX || | |
428 | d == 0 || d == B43_TSSI_MAX) | |
429 | return -ENOENT; | |
430 | /* The values are OK. Clear them. */ | |
431 | tmp = B43_TSSI_MAX | (B43_TSSI_MAX << 8) | | |
432 | (B43_TSSI_MAX << 16) | (B43_TSSI_MAX << 24); | |
433 | b43_shm_write32(dev, B43_SHM_SHARED, shm_offset, tmp); | |
434 | ||
435 | if (is_ofdm) { | |
436 | a = (a + 32) & 0x3F; | |
437 | b = (b + 32) & 0x3F; | |
438 | c = (c + 32) & 0x3F; | |
439 | d = (d + 32) & 0x3F; | |
440 | } | |
441 | ||
442 | /* Get the average of the values with 0.5 added to each value. */ | |
443 | average = (a + b + c + d + 2) / 4; | |
444 | if (is_ofdm) { | |
445 | /* Adjust for CCK-boost */ | |
6e6a2cd5 | 446 | if (b43_shm_read16(dev, B43_SHM_SHARED, B43_SHM_SH_HOSTF1) |
18c8adeb MB |
447 | & B43_HF_CCKBOOST) |
448 | average = (average >= 13) ? (average - 13) : 0; | |
449 | } | |
450 | ||
451 | return average; | |
452 | } | |
cb24f57f MB |
453 | |
454 | void b43_phyop_switch_analog_generic(struct b43_wldev *dev, bool on) | |
455 | { | |
456 | b43_write16(dev, B43_MMIO_PHY0, on ? 0 : 0xF4); | |
457 | } | |
98650454 | 458 | |
abc1f7cd RM |
459 | |
460 | bool b43_channel_type_is_40mhz(enum nl80211_channel_type channel_type) | |
461 | { | |
462 | return (channel_type == NL80211_CHAN_HT40MINUS || | |
463 | channel_type == NL80211_CHAN_HT40PLUS); | |
464 | } | |
465 | ||
f6a3e99d RM |
466 | /* http://bcm-v4.sipsolutions.net/802.11/PHY/N/BmacPhyClkFgc */ |
467 | void b43_phy_force_clock(struct b43_wldev *dev, bool force) | |
468 | { | |
469 | u32 tmp; | |
470 | ||
471 | WARN_ON(dev->phy.type != B43_PHYTYPE_N && | |
472 | dev->phy.type != B43_PHYTYPE_HT); | |
473 | ||
474 | switch (dev->dev->bus_type) { | |
475 | #ifdef CONFIG_B43_BCMA | |
476 | case B43_BUS_BCMA: | |
477 | tmp = bcma_aread32(dev->dev->bdev, BCMA_IOCTL); | |
478 | if (force) | |
479 | tmp |= BCMA_IOCTL_FGC; | |
480 | else | |
481 | tmp &= ~BCMA_IOCTL_FGC; | |
482 | bcma_awrite32(dev->dev->bdev, BCMA_IOCTL, tmp); | |
483 | break; | |
484 | #endif | |
485 | #ifdef CONFIG_B43_SSB | |
486 | case B43_BUS_SSB: | |
487 | tmp = ssb_read32(dev->dev->sdev, SSB_TMSLOW); | |
488 | if (force) | |
489 | tmp |= SSB_TMSLOW_FGC; | |
490 | else | |
491 | tmp &= ~SSB_TMSLOW_FGC; | |
492 | ssb_write32(dev->dev->sdev, SSB_TMSLOW, tmp); | |
493 | break; | |
494 | #endif | |
495 | } | |
496 | } | |
497 | ||
6f98e62a | 498 | /* http://bcm-v4.sipsolutions.net/802.11/PHY/Cordic */ |
98650454 RM |
499 | struct b43_c32 b43_cordic(int theta) |
500 | { | |
5b4bc649 JP |
501 | static const u32 arctg[] = { |
502 | 2949120, 1740967, 919879, 466945, 234379, 117304, | |
503 | 58666, 29335, 14668, 7334, 3667, 1833, | |
504 | 917, 458, 229, 115, 57, 29, | |
505 | }; | |
6f98e62a RM |
506 | u8 i; |
507 | s32 tmp; | |
508 | s8 signx = 1; | |
509 | u32 angle = 0; | |
98650454 RM |
510 | struct b43_c32 ret = { .i = 39797, .q = 0, }; |
511 | ||
6f98e62a RM |
512 | while (theta > (180 << 16)) |
513 | theta -= (360 << 16); | |
514 | while (theta < -(180 << 16)) | |
515 | theta += (360 << 16); | |
98650454 | 516 | |
6f98e62a RM |
517 | if (theta > (90 << 16)) { |
518 | theta -= (180 << 16); | |
98650454 | 519 | signx = -1; |
6f98e62a RM |
520 | } else if (theta < -(90 << 16)) { |
521 | theta += (180 << 16); | |
98650454 RM |
522 | signx = -1; |
523 | } | |
524 | ||
525 | for (i = 0; i <= 17; i++) { | |
526 | if (theta > angle) { | |
527 | tmp = ret.i - (ret.q >> i); | |
528 | ret.q += ret.i >> i; | |
529 | ret.i = tmp; | |
530 | angle += arctg[i]; | |
531 | } else { | |
532 | tmp = ret.i + (ret.q >> i); | |
533 | ret.q -= ret.i >> i; | |
534 | ret.i = tmp; | |
535 | angle -= arctg[i]; | |
536 | } | |
537 | } | |
538 | ||
539 | ret.i *= signx; | |
540 | ret.q *= signx; | |
541 | ||
542 | return ret; | |
543 | } |