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1da177e4 | 1 | /* |
c1017a4c | 2 | * Copyright (c) by Jaroslav Kysela <perex@perex.cz> |
1da177e4 LT |
3 | * Creative Labs, Inc. |
4 | * Routines for control of EMU10K1 chips | |
5 | * | |
6 | * BUGS: | |
7 | * -- | |
8 | * | |
9 | * TODO: | |
10 | * -- | |
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; if not, write to the Free Software | |
24 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
25 | * | |
26 | */ | |
27 | ||
28 | #include <sound/driver.h> | |
29 | #include <linux/time.h> | |
30 | #include <sound/core.h> | |
31 | #include <sound/emu10k1.h> | |
27fe864e | 32 | #include <linux/delay.h> |
184c1e2c | 33 | #include "p17v.h" |
1da177e4 | 34 | |
eb4698f3 | 35 | unsigned int snd_emu10k1_ptr_read(struct snd_emu10k1 * emu, unsigned int reg, unsigned int chn) |
1da177e4 LT |
36 | { |
37 | unsigned long flags; | |
38 | unsigned int regptr, val; | |
39 | unsigned int mask; | |
40 | ||
41 | mask = emu->audigy ? A_PTR_ADDRESS_MASK : PTR_ADDRESS_MASK; | |
42 | regptr = ((reg << 16) & mask) | (chn & PTR_CHANNELNUM_MASK); | |
43 | ||
44 | if (reg & 0xff000000) { | |
45 | unsigned char size, offset; | |
46 | ||
47 | size = (reg >> 24) & 0x3f; | |
48 | offset = (reg >> 16) & 0x1f; | |
49 | mask = ((1 << size) - 1) << offset; | |
50 | ||
51 | spin_lock_irqsave(&emu->emu_lock, flags); | |
52 | outl(regptr, emu->port + PTR); | |
53 | val = inl(emu->port + DATA); | |
54 | spin_unlock_irqrestore(&emu->emu_lock, flags); | |
55 | ||
56 | return (val & mask) >> offset; | |
57 | } else { | |
58 | spin_lock_irqsave(&emu->emu_lock, flags); | |
59 | outl(regptr, emu->port + PTR); | |
60 | val = inl(emu->port + DATA); | |
61 | spin_unlock_irqrestore(&emu->emu_lock, flags); | |
62 | return val; | |
63 | } | |
64 | } | |
65 | ||
2dd31dee TI |
66 | EXPORT_SYMBOL(snd_emu10k1_ptr_read); |
67 | ||
eb4698f3 | 68 | void snd_emu10k1_ptr_write(struct snd_emu10k1 *emu, unsigned int reg, unsigned int chn, unsigned int data) |
1da177e4 LT |
69 | { |
70 | unsigned int regptr; | |
71 | unsigned long flags; | |
72 | unsigned int mask; | |
73 | ||
74 | mask = emu->audigy ? A_PTR_ADDRESS_MASK : PTR_ADDRESS_MASK; | |
75 | regptr = ((reg << 16) & mask) | (chn & PTR_CHANNELNUM_MASK); | |
76 | ||
77 | if (reg & 0xff000000) { | |
78 | unsigned char size, offset; | |
79 | ||
80 | size = (reg >> 24) & 0x3f; | |
81 | offset = (reg >> 16) & 0x1f; | |
82 | mask = ((1 << size) - 1) << offset; | |
83 | data = (data << offset) & mask; | |
84 | ||
85 | spin_lock_irqsave(&emu->emu_lock, flags); | |
86 | outl(regptr, emu->port + PTR); | |
87 | data |= inl(emu->port + DATA) & ~mask; | |
88 | outl(data, emu->port + DATA); | |
89 | spin_unlock_irqrestore(&emu->emu_lock, flags); | |
90 | } else { | |
91 | spin_lock_irqsave(&emu->emu_lock, flags); | |
92 | outl(regptr, emu->port + PTR); | |
93 | outl(data, emu->port + DATA); | |
94 | spin_unlock_irqrestore(&emu->emu_lock, flags); | |
95 | } | |
96 | } | |
97 | ||
2dd31dee TI |
98 | EXPORT_SYMBOL(snd_emu10k1_ptr_write); |
99 | ||
eb4698f3 | 100 | unsigned int snd_emu10k1_ptr20_read(struct snd_emu10k1 * emu, |
1da177e4 LT |
101 | unsigned int reg, |
102 | unsigned int chn) | |
103 | { | |
104 | unsigned long flags; | |
105 | unsigned int regptr, val; | |
106 | ||
107 | regptr = (reg << 16) | chn; | |
108 | ||
109 | spin_lock_irqsave(&emu->emu_lock, flags); | |
110 | outl(regptr, emu->port + 0x20 + PTR); | |
111 | val = inl(emu->port + 0x20 + DATA); | |
112 | spin_unlock_irqrestore(&emu->emu_lock, flags); | |
113 | return val; | |
114 | } | |
115 | ||
eb4698f3 | 116 | void snd_emu10k1_ptr20_write(struct snd_emu10k1 *emu, |
1da177e4 LT |
117 | unsigned int reg, |
118 | unsigned int chn, | |
119 | unsigned int data) | |
120 | { | |
121 | unsigned int regptr; | |
122 | unsigned long flags; | |
123 | ||
124 | regptr = (reg << 16) | chn; | |
125 | ||
126 | spin_lock_irqsave(&emu->emu_lock, flags); | |
127 | outl(regptr, emu->port + 0x20 + PTR); | |
128 | outl(data, emu->port + 0x20 + DATA); | |
129 | spin_unlock_irqrestore(&emu->emu_lock, flags); | |
130 | } | |
131 | ||
27fe864e JCD |
132 | int snd_emu10k1_spi_write(struct snd_emu10k1 * emu, |
133 | unsigned int data) | |
134 | { | |
135 | unsigned int reset, set; | |
136 | unsigned int reg, tmp; | |
137 | int n, result; | |
28bcbddd JCD |
138 | if (emu->card_capabilities->ca0108_chip) |
139 | reg = 0x3c; /* PTR20, reg 0x3c */ | |
140 | else { | |
141 | /* For other chip types the SPI register | |
142 | * is currently unknown. */ | |
143 | return 1; | |
27fe864e | 144 | } |
28bcbddd JCD |
145 | if (data > 0xffff) /* Only 16bit values allowed */ |
146 | return 1; | |
27fe864e JCD |
147 | |
148 | tmp = snd_emu10k1_ptr20_read(emu, reg, 0); | |
28bcbddd | 149 | reset = (tmp & ~0x3ffff) | 0x20000; /* Set xxx20000 */ |
27fe864e JCD |
150 | set = reset | 0x10000; /* Set xxx1xxxx */ |
151 | snd_emu10k1_ptr20_write(emu, reg, 0, reset | data); | |
152 | tmp = snd_emu10k1_ptr20_read(emu, reg, 0); /* write post */ | |
153 | snd_emu10k1_ptr20_write(emu, reg, 0, set | data); | |
154 | result = 1; | |
155 | /* Wait for status bit to return to 0 */ | |
c6a02ca2 | 156 | for (n = 0; n < 100; n++) { |
27fe864e JCD |
157 | udelay(10); |
158 | tmp = snd_emu10k1_ptr20_read(emu, reg, 0); | |
159 | if (!(tmp & 0x10000)) { | |
c6a02ca2 | 160 | result = 0; |
27fe864e JCD |
161 | break; |
162 | } | |
163 | } | |
c6a02ca2 JCD |
164 | if (result) /* Timed out */ |
165 | return 1; | |
27fe864e JCD |
166 | snd_emu10k1_ptr20_write(emu, reg, 0, reset | data); |
167 | tmp = snd_emu10k1_ptr20_read(emu, reg, 0); /* Write post */ | |
168 | return 0; | |
169 | } | |
170 | ||
184c1e2c JCD |
171 | /* The ADC does not support i2c read, so only write is implemented */ |
172 | int snd_emu10k1_i2c_write(struct snd_emu10k1 *emu, | |
173 | u32 reg, | |
174 | u32 value) | |
175 | { | |
176 | u32 tmp; | |
177 | int timeout = 0; | |
178 | int status; | |
179 | int retry; | |
180 | if ((reg > 0x7f) || (value > 0x1ff)) { | |
181 | snd_printk(KERN_ERR "i2c_write: invalid values.\n"); | |
182 | return -EINVAL; | |
183 | } | |
184 | ||
185 | tmp = reg << 25 | value << 16; | |
186 | // snd_printk("I2C-write:reg=0x%x, value=0x%x\n", reg, value); | |
187 | /* Not sure what this I2C channel controls. */ | |
188 | /* snd_emu10k1_ptr_write(emu, P17V_I2C_0, 0, tmp); */ | |
189 | ||
190 | /* This controls the I2C connected to the WM8775 ADC Codec */ | |
191 | snd_emu10k1_ptr20_write(emu, P17V_I2C_1, 0, tmp); | |
192 | tmp = snd_emu10k1_ptr20_read(emu, P17V_I2C_1, 0); /* write post */ | |
193 | ||
194 | for (retry = 0; retry < 10; retry++) { | |
195 | /* Send the data to i2c */ | |
196 | //tmp = snd_emu10k1_ptr_read(emu, P17V_I2C_ADDR, 0); | |
197 | //tmp = tmp & ~(I2C_A_ADC_READ|I2C_A_ADC_LAST|I2C_A_ADC_START|I2C_A_ADC_ADD_MASK); | |
198 | tmp = 0; | |
199 | tmp = tmp | (I2C_A_ADC_LAST|I2C_A_ADC_START|I2C_A_ADC_ADD); | |
200 | snd_emu10k1_ptr20_write(emu, P17V_I2C_ADDR, 0, tmp); | |
201 | ||
202 | /* Wait till the transaction ends */ | |
203 | while (1) { | |
204 | udelay(10); | |
205 | status = snd_emu10k1_ptr20_read(emu, P17V_I2C_ADDR, 0); | |
206 | // snd_printk("I2C:status=0x%x\n", status); | |
207 | timeout++; | |
208 | if ((status & I2C_A_ADC_START) == 0) | |
209 | break; | |
210 | ||
211 | if (timeout > 1000) { | |
212 | snd_printk("emu10k1:I2C:timeout status=0x%x\n", status); | |
213 | break; | |
214 | } | |
215 | } | |
216 | //Read back and see if the transaction is successful | |
217 | if ((status & I2C_A_ADC_ABORT) == 0) | |
218 | break; | |
219 | } | |
220 | ||
221 | if (retry == 10) { | |
222 | snd_printk(KERN_ERR "Writing to ADC failed!\n"); | |
223 | return -EINVAL; | |
224 | } | |
225 | ||
226 | return 0; | |
227 | } | |
228 | ||
f93abe51 | 229 | int snd_emu1010_fpga_write(struct snd_emu10k1 * emu, u32 reg, u32 value) |
9f4bd5dd | 230 | { |
f93abe51 | 231 | if (reg > 0x3f) |
9f4bd5dd JCD |
232 | return 1; |
233 | reg += 0x40; /* 0x40 upwards are registers. */ | |
234 | if (value < 0 || value > 0x3f) /* 0 to 0x3f are values */ | |
235 | return 1; | |
236 | outl(reg, emu->port + A_IOCFG); | |
237 | udelay(10); | |
238 | outl(reg | 0x80, emu->port + A_IOCFG); /* High bit clocks the value into the fpga. */ | |
239 | udelay(10); | |
240 | outl(value, emu->port + A_IOCFG); | |
241 | udelay(10); | |
242 | outl(value | 0x80 , emu->port + A_IOCFG); /* High bit clocks the value into the fpga. */ | |
243 | ||
244 | return 0; | |
245 | } | |
246 | ||
f93abe51 | 247 | int snd_emu1010_fpga_read(struct snd_emu10k1 * emu, u32 reg, u32 *value) |
9f4bd5dd | 248 | { |
f93abe51 | 249 | if (reg > 0x3f) |
9f4bd5dd JCD |
250 | return 1; |
251 | reg += 0x40; /* 0x40 upwards are registers. */ | |
252 | outl(reg, emu->port + A_IOCFG); | |
253 | udelay(10); | |
254 | outl(reg | 0x80, emu->port + A_IOCFG); /* High bit clocks the value into the fpga. */ | |
255 | udelay(10); | |
256 | *value = ((inl(emu->port + A_IOCFG) >> 8) & 0x7f); | |
257 | ||
258 | return 0; | |
259 | } | |
260 | ||
261 | /* Each Destination has one and only one Source, | |
262 | * but one Source can feed any number of Destinations simultaneously. | |
263 | */ | |
f93abe51 | 264 | int snd_emu1010_fpga_link_dst_src_write(struct snd_emu10k1 * emu, u32 dst, u32 src) |
9f4bd5dd JCD |
265 | { |
266 | snd_emu1010_fpga_write(emu, 0x00, ((dst >> 8) & 0x3f) ); | |
267 | snd_emu1010_fpga_write(emu, 0x01, (dst & 0x3f) ); | |
268 | snd_emu1010_fpga_write(emu, 0x02, ((src >> 8) & 0x3f) ); | |
269 | snd_emu1010_fpga_write(emu, 0x03, (src & 0x3f) ); | |
270 | ||
271 | return 0; | |
272 | } | |
273 | ||
eb4698f3 | 274 | void snd_emu10k1_intr_enable(struct snd_emu10k1 *emu, unsigned int intrenb) |
1da177e4 LT |
275 | { |
276 | unsigned long flags; | |
277 | unsigned int enable; | |
278 | ||
279 | spin_lock_irqsave(&emu->emu_lock, flags); | |
280 | enable = inl(emu->port + INTE) | intrenb; | |
281 | outl(enable, emu->port + INTE); | |
282 | spin_unlock_irqrestore(&emu->emu_lock, flags); | |
283 | } | |
284 | ||
eb4698f3 | 285 | void snd_emu10k1_intr_disable(struct snd_emu10k1 *emu, unsigned int intrenb) |
1da177e4 LT |
286 | { |
287 | unsigned long flags; | |
288 | unsigned int enable; | |
289 | ||
290 | spin_lock_irqsave(&emu->emu_lock, flags); | |
291 | enable = inl(emu->port + INTE) & ~intrenb; | |
292 | outl(enable, emu->port + INTE); | |
293 | spin_unlock_irqrestore(&emu->emu_lock, flags); | |
294 | } | |
295 | ||
eb4698f3 | 296 | void snd_emu10k1_voice_intr_enable(struct snd_emu10k1 *emu, unsigned int voicenum) |
1da177e4 LT |
297 | { |
298 | unsigned long flags; | |
299 | unsigned int val; | |
300 | ||
301 | spin_lock_irqsave(&emu->emu_lock, flags); | |
302 | /* voice interrupt */ | |
303 | if (voicenum >= 32) { | |
304 | outl(CLIEH << 16, emu->port + PTR); | |
305 | val = inl(emu->port + DATA); | |
306 | val |= 1 << (voicenum - 32); | |
307 | } else { | |
308 | outl(CLIEL << 16, emu->port + PTR); | |
309 | val = inl(emu->port + DATA); | |
310 | val |= 1 << voicenum; | |
311 | } | |
312 | outl(val, emu->port + DATA); | |
313 | spin_unlock_irqrestore(&emu->emu_lock, flags); | |
314 | } | |
315 | ||
eb4698f3 | 316 | void snd_emu10k1_voice_intr_disable(struct snd_emu10k1 *emu, unsigned int voicenum) |
1da177e4 LT |
317 | { |
318 | unsigned long flags; | |
319 | unsigned int val; | |
320 | ||
321 | spin_lock_irqsave(&emu->emu_lock, flags); | |
322 | /* voice interrupt */ | |
323 | if (voicenum >= 32) { | |
324 | outl(CLIEH << 16, emu->port + PTR); | |
325 | val = inl(emu->port + DATA); | |
326 | val &= ~(1 << (voicenum - 32)); | |
327 | } else { | |
328 | outl(CLIEL << 16, emu->port + PTR); | |
329 | val = inl(emu->port + DATA); | |
330 | val &= ~(1 << voicenum); | |
331 | } | |
332 | outl(val, emu->port + DATA); | |
333 | spin_unlock_irqrestore(&emu->emu_lock, flags); | |
334 | } | |
335 | ||
eb4698f3 | 336 | void snd_emu10k1_voice_intr_ack(struct snd_emu10k1 *emu, unsigned int voicenum) |
1da177e4 LT |
337 | { |
338 | unsigned long flags; | |
339 | ||
340 | spin_lock_irqsave(&emu->emu_lock, flags); | |
341 | /* voice interrupt */ | |
342 | if (voicenum >= 32) { | |
343 | outl(CLIPH << 16, emu->port + PTR); | |
344 | voicenum = 1 << (voicenum - 32); | |
345 | } else { | |
346 | outl(CLIPL << 16, emu->port + PTR); | |
347 | voicenum = 1 << voicenum; | |
348 | } | |
349 | outl(voicenum, emu->port + DATA); | |
350 | spin_unlock_irqrestore(&emu->emu_lock, flags); | |
351 | } | |
352 | ||
eb4698f3 | 353 | void snd_emu10k1_voice_half_loop_intr_enable(struct snd_emu10k1 *emu, unsigned int voicenum) |
1da177e4 LT |
354 | { |
355 | unsigned long flags; | |
356 | unsigned int val; | |
357 | ||
358 | spin_lock_irqsave(&emu->emu_lock, flags); | |
359 | /* voice interrupt */ | |
360 | if (voicenum >= 32) { | |
361 | outl(HLIEH << 16, emu->port + PTR); | |
362 | val = inl(emu->port + DATA); | |
363 | val |= 1 << (voicenum - 32); | |
364 | } else { | |
365 | outl(HLIEL << 16, emu->port + PTR); | |
366 | val = inl(emu->port + DATA); | |
367 | val |= 1 << voicenum; | |
368 | } | |
369 | outl(val, emu->port + DATA); | |
370 | spin_unlock_irqrestore(&emu->emu_lock, flags); | |
371 | } | |
372 | ||
eb4698f3 | 373 | void snd_emu10k1_voice_half_loop_intr_disable(struct snd_emu10k1 *emu, unsigned int voicenum) |
1da177e4 LT |
374 | { |
375 | unsigned long flags; | |
376 | unsigned int val; | |
377 | ||
378 | spin_lock_irqsave(&emu->emu_lock, flags); | |
379 | /* voice interrupt */ | |
380 | if (voicenum >= 32) { | |
381 | outl(HLIEH << 16, emu->port + PTR); | |
382 | val = inl(emu->port + DATA); | |
383 | val &= ~(1 << (voicenum - 32)); | |
384 | } else { | |
385 | outl(HLIEL << 16, emu->port + PTR); | |
386 | val = inl(emu->port + DATA); | |
387 | val &= ~(1 << voicenum); | |
388 | } | |
389 | outl(val, emu->port + DATA); | |
390 | spin_unlock_irqrestore(&emu->emu_lock, flags); | |
391 | } | |
392 | ||
eb4698f3 | 393 | void snd_emu10k1_voice_half_loop_intr_ack(struct snd_emu10k1 *emu, unsigned int voicenum) |
1da177e4 LT |
394 | { |
395 | unsigned long flags; | |
396 | ||
397 | spin_lock_irqsave(&emu->emu_lock, flags); | |
398 | /* voice interrupt */ | |
399 | if (voicenum >= 32) { | |
400 | outl(HLIPH << 16, emu->port + PTR); | |
401 | voicenum = 1 << (voicenum - 32); | |
402 | } else { | |
403 | outl(HLIPL << 16, emu->port + PTR); | |
404 | voicenum = 1 << voicenum; | |
405 | } | |
406 | outl(voicenum, emu->port + DATA); | |
407 | spin_unlock_irqrestore(&emu->emu_lock, flags); | |
408 | } | |
409 | ||
eb4698f3 | 410 | void snd_emu10k1_voice_set_loop_stop(struct snd_emu10k1 *emu, unsigned int voicenum) |
1da177e4 LT |
411 | { |
412 | unsigned long flags; | |
413 | unsigned int sol; | |
414 | ||
415 | spin_lock_irqsave(&emu->emu_lock, flags); | |
416 | /* voice interrupt */ | |
417 | if (voicenum >= 32) { | |
418 | outl(SOLEH << 16, emu->port + PTR); | |
419 | sol = inl(emu->port + DATA); | |
420 | sol |= 1 << (voicenum - 32); | |
421 | } else { | |
422 | outl(SOLEL << 16, emu->port + PTR); | |
423 | sol = inl(emu->port + DATA); | |
424 | sol |= 1 << voicenum; | |
425 | } | |
426 | outl(sol, emu->port + DATA); | |
427 | spin_unlock_irqrestore(&emu->emu_lock, flags); | |
428 | } | |
429 | ||
eb4698f3 | 430 | void snd_emu10k1_voice_clear_loop_stop(struct snd_emu10k1 *emu, unsigned int voicenum) |
1da177e4 LT |
431 | { |
432 | unsigned long flags; | |
433 | unsigned int sol; | |
434 | ||
435 | spin_lock_irqsave(&emu->emu_lock, flags); | |
436 | /* voice interrupt */ | |
437 | if (voicenum >= 32) { | |
438 | outl(SOLEH << 16, emu->port + PTR); | |
439 | sol = inl(emu->port + DATA); | |
440 | sol &= ~(1 << (voicenum - 32)); | |
441 | } else { | |
442 | outl(SOLEL << 16, emu->port + PTR); | |
443 | sol = inl(emu->port + DATA); | |
444 | sol &= ~(1 << voicenum); | |
445 | } | |
446 | outl(sol, emu->port + DATA); | |
447 | spin_unlock_irqrestore(&emu->emu_lock, flags); | |
448 | } | |
449 | ||
eb4698f3 | 450 | void snd_emu10k1_wait(struct snd_emu10k1 *emu, unsigned int wait) |
1da177e4 LT |
451 | { |
452 | volatile unsigned count; | |
453 | unsigned int newtime = 0, curtime; | |
454 | ||
455 | curtime = inl(emu->port + WC) >> 6; | |
456 | while (wait-- > 0) { | |
457 | count = 0; | |
458 | while (count++ < 16384) { | |
459 | newtime = inl(emu->port + WC) >> 6; | |
460 | if (newtime != curtime) | |
461 | break; | |
462 | } | |
463 | if (count >= 16384) | |
464 | break; | |
465 | curtime = newtime; | |
466 | } | |
467 | } | |
468 | ||
eb4698f3 | 469 | unsigned short snd_emu10k1_ac97_read(struct snd_ac97 *ac97, unsigned short reg) |
1da177e4 | 470 | { |
eb4698f3 | 471 | struct snd_emu10k1 *emu = ac97->private_data; |
1da177e4 LT |
472 | unsigned long flags; |
473 | unsigned short val; | |
474 | ||
475 | spin_lock_irqsave(&emu->emu_lock, flags); | |
476 | outb(reg, emu->port + AC97ADDRESS); | |
477 | val = inw(emu->port + AC97DATA); | |
478 | spin_unlock_irqrestore(&emu->emu_lock, flags); | |
479 | return val; | |
480 | } | |
481 | ||
eb4698f3 | 482 | void snd_emu10k1_ac97_write(struct snd_ac97 *ac97, unsigned short reg, unsigned short data) |
1da177e4 | 483 | { |
eb4698f3 | 484 | struct snd_emu10k1 *emu = ac97->private_data; |
1da177e4 LT |
485 | unsigned long flags; |
486 | ||
487 | spin_lock_irqsave(&emu->emu_lock, flags); | |
488 | outb(reg, emu->port + AC97ADDRESS); | |
489 | outw(data, emu->port + AC97DATA); | |
490 | spin_unlock_irqrestore(&emu->emu_lock, flags); | |
491 | } | |
492 | ||
493 | /* | |
494 | * convert rate to pitch | |
495 | */ | |
496 | ||
497 | unsigned int snd_emu10k1_rate_to_pitch(unsigned int rate) | |
498 | { | |
499 | static u32 logMagTable[128] = { | |
500 | 0x00000, 0x02dfc, 0x05b9e, 0x088e6, 0x0b5d6, 0x0e26f, 0x10eb3, 0x13aa2, | |
501 | 0x1663f, 0x1918a, 0x1bc84, 0x1e72e, 0x2118b, 0x23b9a, 0x2655d, 0x28ed5, | |
502 | 0x2b803, 0x2e0e8, 0x30985, 0x331db, 0x359eb, 0x381b6, 0x3a93d, 0x3d081, | |
503 | 0x3f782, 0x41e42, 0x444c1, 0x46b01, 0x49101, 0x4b6c4, 0x4dc49, 0x50191, | |
504 | 0x5269e, 0x54b6f, 0x57006, 0x59463, 0x5b888, 0x5dc74, 0x60029, 0x623a7, | |
505 | 0x646ee, 0x66a00, 0x68cdd, 0x6af86, 0x6d1fa, 0x6f43c, 0x7164b, 0x73829, | |
506 | 0x759d4, 0x77b4f, 0x79c9a, 0x7bdb5, 0x7dea1, 0x7ff5e, 0x81fed, 0x8404e, | |
507 | 0x86082, 0x88089, 0x8a064, 0x8c014, 0x8df98, 0x8fef1, 0x91e20, 0x93d26, | |
508 | 0x95c01, 0x97ab4, 0x9993e, 0x9b79f, 0x9d5d9, 0x9f3ec, 0xa11d8, 0xa2f9d, | |
509 | 0xa4d3c, 0xa6ab5, 0xa8808, 0xaa537, 0xac241, 0xadf26, 0xafbe7, 0xb1885, | |
510 | 0xb3500, 0xb5157, 0xb6d8c, 0xb899f, 0xba58f, 0xbc15e, 0xbdd0c, 0xbf899, | |
511 | 0xc1404, 0xc2f50, 0xc4a7b, 0xc6587, 0xc8073, 0xc9b3f, 0xcb5ed, 0xcd07c, | |
512 | 0xceaec, 0xd053f, 0xd1f73, 0xd398a, 0xd5384, 0xd6d60, 0xd8720, 0xda0c3, | |
513 | 0xdba4a, 0xdd3b4, 0xded03, 0xe0636, 0xe1f4e, 0xe384a, 0xe512c, 0xe69f3, | |
514 | 0xe829f, 0xe9b31, 0xeb3a9, 0xecc08, 0xee44c, 0xefc78, 0xf148a, 0xf2c83, | |
515 | 0xf4463, 0xf5c2a, 0xf73da, 0xf8b71, 0xfa2f0, 0xfba57, 0xfd1a7, 0xfe8df | |
516 | }; | |
517 | static char logSlopeTable[128] = { | |
518 | 0x5c, 0x5c, 0x5b, 0x5a, 0x5a, 0x59, 0x58, 0x58, | |
519 | 0x57, 0x56, 0x56, 0x55, 0x55, 0x54, 0x53, 0x53, | |
520 | 0x52, 0x52, 0x51, 0x51, 0x50, 0x50, 0x4f, 0x4f, | |
521 | 0x4e, 0x4d, 0x4d, 0x4d, 0x4c, 0x4c, 0x4b, 0x4b, | |
522 | 0x4a, 0x4a, 0x49, 0x49, 0x48, 0x48, 0x47, 0x47, | |
523 | 0x47, 0x46, 0x46, 0x45, 0x45, 0x45, 0x44, 0x44, | |
524 | 0x43, 0x43, 0x43, 0x42, 0x42, 0x42, 0x41, 0x41, | |
525 | 0x41, 0x40, 0x40, 0x40, 0x3f, 0x3f, 0x3f, 0x3e, | |
526 | 0x3e, 0x3e, 0x3d, 0x3d, 0x3d, 0x3c, 0x3c, 0x3c, | |
527 | 0x3b, 0x3b, 0x3b, 0x3b, 0x3a, 0x3a, 0x3a, 0x39, | |
528 | 0x39, 0x39, 0x39, 0x38, 0x38, 0x38, 0x38, 0x37, | |
529 | 0x37, 0x37, 0x37, 0x36, 0x36, 0x36, 0x36, 0x35, | |
530 | 0x35, 0x35, 0x35, 0x34, 0x34, 0x34, 0x34, 0x34, | |
531 | 0x33, 0x33, 0x33, 0x33, 0x32, 0x32, 0x32, 0x32, | |
532 | 0x32, 0x31, 0x31, 0x31, 0x31, 0x31, 0x30, 0x30, | |
533 | 0x30, 0x30, 0x30, 0x2f, 0x2f, 0x2f, 0x2f, 0x2f | |
534 | }; | |
535 | int i; | |
536 | ||
537 | if (rate == 0) | |
538 | return 0; /* Bail out if no leading "1" */ | |
539 | rate *= 11185; /* Scale 48000 to 0x20002380 */ | |
540 | for (i = 31; i > 0; i--) { | |
541 | if (rate & 0x80000000) { /* Detect leading "1" */ | |
542 | return (((unsigned int) (i - 15) << 20) + | |
543 | logMagTable[0x7f & (rate >> 24)] + | |
544 | (0x7f & (rate >> 17)) * | |
545 | logSlopeTable[0x7f & (rate >> 24)]); | |
546 | } | |
547 | rate <<= 1; | |
548 | } | |
549 | ||
550 | return 0; /* Should never reach this point */ | |
551 | } | |
552 |