Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) by Jaroslav Kysela <perex@suse.cz> |
| 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> |
James Courtier-Dutton | 27fe864 | 2005-12-21 15:06:08 +0100 | [diff] [blame] | 32 | #include <linux/delay.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | |
Takashi Iwai | eb4698f | 2005-11-17 14:50:13 +0100 | [diff] [blame] | 34 | unsigned int snd_emu10k1_ptr_read(struct snd_emu10k1 * emu, unsigned int reg, unsigned int chn) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | { |
| 36 | unsigned long flags; |
| 37 | unsigned int regptr, val; |
| 38 | unsigned int mask; |
| 39 | |
| 40 | mask = emu->audigy ? A_PTR_ADDRESS_MASK : PTR_ADDRESS_MASK; |
| 41 | regptr = ((reg << 16) & mask) | (chn & PTR_CHANNELNUM_MASK); |
| 42 | |
| 43 | if (reg & 0xff000000) { |
| 44 | unsigned char size, offset; |
| 45 | |
| 46 | size = (reg >> 24) & 0x3f; |
| 47 | offset = (reg >> 16) & 0x1f; |
| 48 | mask = ((1 << size) - 1) << offset; |
| 49 | |
| 50 | spin_lock_irqsave(&emu->emu_lock, flags); |
| 51 | outl(regptr, emu->port + PTR); |
| 52 | val = inl(emu->port + DATA); |
| 53 | spin_unlock_irqrestore(&emu->emu_lock, flags); |
| 54 | |
| 55 | return (val & mask) >> offset; |
| 56 | } else { |
| 57 | spin_lock_irqsave(&emu->emu_lock, flags); |
| 58 | outl(regptr, emu->port + PTR); |
| 59 | val = inl(emu->port + DATA); |
| 60 | spin_unlock_irqrestore(&emu->emu_lock, flags); |
| 61 | return val; |
| 62 | } |
| 63 | } |
| 64 | |
Takashi Iwai | eb4698f | 2005-11-17 14:50:13 +0100 | [diff] [blame] | 65 | void snd_emu10k1_ptr_write(struct snd_emu10k1 *emu, unsigned int reg, unsigned int chn, unsigned int data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | { |
| 67 | unsigned int regptr; |
| 68 | unsigned long flags; |
| 69 | unsigned int mask; |
| 70 | |
| 71 | mask = emu->audigy ? A_PTR_ADDRESS_MASK : PTR_ADDRESS_MASK; |
| 72 | regptr = ((reg << 16) & mask) | (chn & PTR_CHANNELNUM_MASK); |
| 73 | |
| 74 | if (reg & 0xff000000) { |
| 75 | unsigned char size, offset; |
| 76 | |
| 77 | size = (reg >> 24) & 0x3f; |
| 78 | offset = (reg >> 16) & 0x1f; |
| 79 | mask = ((1 << size) - 1) << offset; |
| 80 | data = (data << offset) & mask; |
| 81 | |
| 82 | spin_lock_irqsave(&emu->emu_lock, flags); |
| 83 | outl(regptr, emu->port + PTR); |
| 84 | data |= inl(emu->port + DATA) & ~mask; |
| 85 | outl(data, emu->port + DATA); |
| 86 | spin_unlock_irqrestore(&emu->emu_lock, flags); |
| 87 | } else { |
| 88 | spin_lock_irqsave(&emu->emu_lock, flags); |
| 89 | outl(regptr, emu->port + PTR); |
| 90 | outl(data, emu->port + DATA); |
| 91 | spin_unlock_irqrestore(&emu->emu_lock, flags); |
| 92 | } |
| 93 | } |
| 94 | |
Takashi Iwai | eb4698f | 2005-11-17 14:50:13 +0100 | [diff] [blame] | 95 | unsigned int snd_emu10k1_ptr20_read(struct snd_emu10k1 * emu, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | unsigned int reg, |
| 97 | unsigned int chn) |
| 98 | { |
| 99 | unsigned long flags; |
| 100 | unsigned int regptr, val; |
| 101 | |
| 102 | regptr = (reg << 16) | chn; |
| 103 | |
| 104 | spin_lock_irqsave(&emu->emu_lock, flags); |
| 105 | outl(regptr, emu->port + 0x20 + PTR); |
| 106 | val = inl(emu->port + 0x20 + DATA); |
| 107 | spin_unlock_irqrestore(&emu->emu_lock, flags); |
| 108 | return val; |
| 109 | } |
| 110 | |
Takashi Iwai | eb4698f | 2005-11-17 14:50:13 +0100 | [diff] [blame] | 111 | void snd_emu10k1_ptr20_write(struct snd_emu10k1 *emu, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | unsigned int reg, |
| 113 | unsigned int chn, |
| 114 | unsigned int data) |
| 115 | { |
| 116 | unsigned int regptr; |
| 117 | unsigned long flags; |
| 118 | |
| 119 | regptr = (reg << 16) | chn; |
| 120 | |
| 121 | spin_lock_irqsave(&emu->emu_lock, flags); |
| 122 | outl(regptr, emu->port + 0x20 + PTR); |
| 123 | outl(data, emu->port + 0x20 + DATA); |
| 124 | spin_unlock_irqrestore(&emu->emu_lock, flags); |
| 125 | } |
| 126 | |
James Courtier-Dutton | 27fe864 | 2005-12-21 15:06:08 +0100 | [diff] [blame] | 127 | int snd_emu10k1_spi_write(struct snd_emu10k1 * emu, |
| 128 | unsigned int data) |
| 129 | { |
| 130 | unsigned int reset, set; |
| 131 | unsigned int reg, tmp; |
| 132 | int n, result; |
James Courtier-Dutton | 28bcbdd | 2005-12-21 15:41:50 +0100 | [diff] [blame] | 133 | if (emu->card_capabilities->ca0108_chip) |
| 134 | reg = 0x3c; /* PTR20, reg 0x3c */ |
| 135 | else { |
| 136 | /* For other chip types the SPI register |
| 137 | * is currently unknown. */ |
| 138 | return 1; |
James Courtier-Dutton | 27fe864 | 2005-12-21 15:06:08 +0100 | [diff] [blame] | 139 | } |
James Courtier-Dutton | 28bcbdd | 2005-12-21 15:41:50 +0100 | [diff] [blame] | 140 | if (data > 0xffff) /* Only 16bit values allowed */ |
| 141 | return 1; |
James Courtier-Dutton | 27fe864 | 2005-12-21 15:06:08 +0100 | [diff] [blame] | 142 | |
| 143 | tmp = snd_emu10k1_ptr20_read(emu, reg, 0); |
James Courtier-Dutton | 28bcbdd | 2005-12-21 15:41:50 +0100 | [diff] [blame] | 144 | reset = (tmp & ~0x3ffff) | 0x20000; /* Set xxx20000 */ |
James Courtier-Dutton | 27fe864 | 2005-12-21 15:06:08 +0100 | [diff] [blame] | 145 | set = reset | 0x10000; /* Set xxx1xxxx */ |
| 146 | snd_emu10k1_ptr20_write(emu, reg, 0, reset | data); |
| 147 | tmp = snd_emu10k1_ptr20_read(emu, reg, 0); /* write post */ |
| 148 | snd_emu10k1_ptr20_write(emu, reg, 0, set | data); |
| 149 | result = 1; |
| 150 | /* Wait for status bit to return to 0 */ |
James Courtier-Dutton | c6a02ca | 2005-12-21 15:56:01 +0100 | [diff] [blame^] | 151 | for (n = 0; n < 100; n++) { |
James Courtier-Dutton | 27fe864 | 2005-12-21 15:06:08 +0100 | [diff] [blame] | 152 | udelay(10); |
| 153 | tmp = snd_emu10k1_ptr20_read(emu, reg, 0); |
| 154 | if (!(tmp & 0x10000)) { |
James Courtier-Dutton | c6a02ca | 2005-12-21 15:56:01 +0100 | [diff] [blame^] | 155 | result = 0; |
James Courtier-Dutton | 27fe864 | 2005-12-21 15:06:08 +0100 | [diff] [blame] | 156 | break; |
| 157 | } |
| 158 | } |
James Courtier-Dutton | c6a02ca | 2005-12-21 15:56:01 +0100 | [diff] [blame^] | 159 | if (result) /* Timed out */ |
| 160 | return 1; |
James Courtier-Dutton | 27fe864 | 2005-12-21 15:06:08 +0100 | [diff] [blame] | 161 | snd_emu10k1_ptr20_write(emu, reg, 0, reset | data); |
| 162 | tmp = snd_emu10k1_ptr20_read(emu, reg, 0); /* Write post */ |
| 163 | return 0; |
| 164 | } |
| 165 | |
Takashi Iwai | eb4698f | 2005-11-17 14:50:13 +0100 | [diff] [blame] | 166 | void snd_emu10k1_intr_enable(struct snd_emu10k1 *emu, unsigned int intrenb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | { |
| 168 | unsigned long flags; |
| 169 | unsigned int enable; |
| 170 | |
| 171 | spin_lock_irqsave(&emu->emu_lock, flags); |
| 172 | enable = inl(emu->port + INTE) | intrenb; |
| 173 | outl(enable, emu->port + INTE); |
| 174 | spin_unlock_irqrestore(&emu->emu_lock, flags); |
| 175 | } |
| 176 | |
Takashi Iwai | eb4698f | 2005-11-17 14:50:13 +0100 | [diff] [blame] | 177 | void snd_emu10k1_intr_disable(struct snd_emu10k1 *emu, unsigned int intrenb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | { |
| 179 | unsigned long flags; |
| 180 | unsigned int enable; |
| 181 | |
| 182 | spin_lock_irqsave(&emu->emu_lock, flags); |
| 183 | enable = inl(emu->port + INTE) & ~intrenb; |
| 184 | outl(enable, emu->port + INTE); |
| 185 | spin_unlock_irqrestore(&emu->emu_lock, flags); |
| 186 | } |
| 187 | |
Takashi Iwai | eb4698f | 2005-11-17 14:50:13 +0100 | [diff] [blame] | 188 | void snd_emu10k1_voice_intr_enable(struct snd_emu10k1 *emu, unsigned int voicenum) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | { |
| 190 | unsigned long flags; |
| 191 | unsigned int val; |
| 192 | |
| 193 | spin_lock_irqsave(&emu->emu_lock, flags); |
| 194 | /* voice interrupt */ |
| 195 | if (voicenum >= 32) { |
| 196 | outl(CLIEH << 16, emu->port + PTR); |
| 197 | val = inl(emu->port + DATA); |
| 198 | val |= 1 << (voicenum - 32); |
| 199 | } else { |
| 200 | outl(CLIEL << 16, emu->port + PTR); |
| 201 | val = inl(emu->port + DATA); |
| 202 | val |= 1 << voicenum; |
| 203 | } |
| 204 | outl(val, emu->port + DATA); |
| 205 | spin_unlock_irqrestore(&emu->emu_lock, flags); |
| 206 | } |
| 207 | |
Takashi Iwai | eb4698f | 2005-11-17 14:50:13 +0100 | [diff] [blame] | 208 | void snd_emu10k1_voice_intr_disable(struct snd_emu10k1 *emu, unsigned int voicenum) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | { |
| 210 | unsigned long flags; |
| 211 | unsigned int val; |
| 212 | |
| 213 | spin_lock_irqsave(&emu->emu_lock, flags); |
| 214 | /* voice interrupt */ |
| 215 | if (voicenum >= 32) { |
| 216 | outl(CLIEH << 16, emu->port + PTR); |
| 217 | val = inl(emu->port + DATA); |
| 218 | val &= ~(1 << (voicenum - 32)); |
| 219 | } else { |
| 220 | outl(CLIEL << 16, emu->port + PTR); |
| 221 | val = inl(emu->port + DATA); |
| 222 | val &= ~(1 << voicenum); |
| 223 | } |
| 224 | outl(val, emu->port + DATA); |
| 225 | spin_unlock_irqrestore(&emu->emu_lock, flags); |
| 226 | } |
| 227 | |
Takashi Iwai | eb4698f | 2005-11-17 14:50:13 +0100 | [diff] [blame] | 228 | void snd_emu10k1_voice_intr_ack(struct snd_emu10k1 *emu, unsigned int voicenum) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | { |
| 230 | unsigned long flags; |
| 231 | |
| 232 | spin_lock_irqsave(&emu->emu_lock, flags); |
| 233 | /* voice interrupt */ |
| 234 | if (voicenum >= 32) { |
| 235 | outl(CLIPH << 16, emu->port + PTR); |
| 236 | voicenum = 1 << (voicenum - 32); |
| 237 | } else { |
| 238 | outl(CLIPL << 16, emu->port + PTR); |
| 239 | voicenum = 1 << voicenum; |
| 240 | } |
| 241 | outl(voicenum, emu->port + DATA); |
| 242 | spin_unlock_irqrestore(&emu->emu_lock, flags); |
| 243 | } |
| 244 | |
Takashi Iwai | eb4698f | 2005-11-17 14:50:13 +0100 | [diff] [blame] | 245 | void snd_emu10k1_voice_half_loop_intr_enable(struct snd_emu10k1 *emu, unsigned int voicenum) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | { |
| 247 | unsigned long flags; |
| 248 | unsigned int val; |
| 249 | |
| 250 | spin_lock_irqsave(&emu->emu_lock, flags); |
| 251 | /* voice interrupt */ |
| 252 | if (voicenum >= 32) { |
| 253 | outl(HLIEH << 16, emu->port + PTR); |
| 254 | val = inl(emu->port + DATA); |
| 255 | val |= 1 << (voicenum - 32); |
| 256 | } else { |
| 257 | outl(HLIEL << 16, emu->port + PTR); |
| 258 | val = inl(emu->port + DATA); |
| 259 | val |= 1 << voicenum; |
| 260 | } |
| 261 | outl(val, emu->port + DATA); |
| 262 | spin_unlock_irqrestore(&emu->emu_lock, flags); |
| 263 | } |
| 264 | |
Takashi Iwai | eb4698f | 2005-11-17 14:50:13 +0100 | [diff] [blame] | 265 | void snd_emu10k1_voice_half_loop_intr_disable(struct snd_emu10k1 *emu, unsigned int voicenum) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | { |
| 267 | unsigned long flags; |
| 268 | unsigned int val; |
| 269 | |
| 270 | spin_lock_irqsave(&emu->emu_lock, flags); |
| 271 | /* voice interrupt */ |
| 272 | if (voicenum >= 32) { |
| 273 | outl(HLIEH << 16, emu->port + PTR); |
| 274 | val = inl(emu->port + DATA); |
| 275 | val &= ~(1 << (voicenum - 32)); |
| 276 | } else { |
| 277 | outl(HLIEL << 16, emu->port + PTR); |
| 278 | val = inl(emu->port + DATA); |
| 279 | val &= ~(1 << voicenum); |
| 280 | } |
| 281 | outl(val, emu->port + DATA); |
| 282 | spin_unlock_irqrestore(&emu->emu_lock, flags); |
| 283 | } |
| 284 | |
Takashi Iwai | eb4698f | 2005-11-17 14:50:13 +0100 | [diff] [blame] | 285 | void snd_emu10k1_voice_half_loop_intr_ack(struct snd_emu10k1 *emu, unsigned int voicenum) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | { |
| 287 | unsigned long flags; |
| 288 | |
| 289 | spin_lock_irqsave(&emu->emu_lock, flags); |
| 290 | /* voice interrupt */ |
| 291 | if (voicenum >= 32) { |
| 292 | outl(HLIPH << 16, emu->port + PTR); |
| 293 | voicenum = 1 << (voicenum - 32); |
| 294 | } else { |
| 295 | outl(HLIPL << 16, emu->port + PTR); |
| 296 | voicenum = 1 << voicenum; |
| 297 | } |
| 298 | outl(voicenum, emu->port + DATA); |
| 299 | spin_unlock_irqrestore(&emu->emu_lock, flags); |
| 300 | } |
| 301 | |
Takashi Iwai | eb4698f | 2005-11-17 14:50:13 +0100 | [diff] [blame] | 302 | void snd_emu10k1_voice_set_loop_stop(struct snd_emu10k1 *emu, unsigned int voicenum) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | { |
| 304 | unsigned long flags; |
| 305 | unsigned int sol; |
| 306 | |
| 307 | spin_lock_irqsave(&emu->emu_lock, flags); |
| 308 | /* voice interrupt */ |
| 309 | if (voicenum >= 32) { |
| 310 | outl(SOLEH << 16, emu->port + PTR); |
| 311 | sol = inl(emu->port + DATA); |
| 312 | sol |= 1 << (voicenum - 32); |
| 313 | } else { |
| 314 | outl(SOLEL << 16, emu->port + PTR); |
| 315 | sol = inl(emu->port + DATA); |
| 316 | sol |= 1 << voicenum; |
| 317 | } |
| 318 | outl(sol, emu->port + DATA); |
| 319 | spin_unlock_irqrestore(&emu->emu_lock, flags); |
| 320 | } |
| 321 | |
Takashi Iwai | eb4698f | 2005-11-17 14:50:13 +0100 | [diff] [blame] | 322 | void snd_emu10k1_voice_clear_loop_stop(struct snd_emu10k1 *emu, unsigned int voicenum) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | { |
| 324 | unsigned long flags; |
| 325 | unsigned int sol; |
| 326 | |
| 327 | spin_lock_irqsave(&emu->emu_lock, flags); |
| 328 | /* voice interrupt */ |
| 329 | if (voicenum >= 32) { |
| 330 | outl(SOLEH << 16, emu->port + PTR); |
| 331 | sol = inl(emu->port + DATA); |
| 332 | sol &= ~(1 << (voicenum - 32)); |
| 333 | } else { |
| 334 | outl(SOLEL << 16, emu->port + PTR); |
| 335 | sol = inl(emu->port + DATA); |
| 336 | sol &= ~(1 << voicenum); |
| 337 | } |
| 338 | outl(sol, emu->port + DATA); |
| 339 | spin_unlock_irqrestore(&emu->emu_lock, flags); |
| 340 | } |
| 341 | |
Takashi Iwai | eb4698f | 2005-11-17 14:50:13 +0100 | [diff] [blame] | 342 | void snd_emu10k1_wait(struct snd_emu10k1 *emu, unsigned int wait) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | { |
| 344 | volatile unsigned count; |
| 345 | unsigned int newtime = 0, curtime; |
| 346 | |
| 347 | curtime = inl(emu->port + WC) >> 6; |
| 348 | while (wait-- > 0) { |
| 349 | count = 0; |
| 350 | while (count++ < 16384) { |
| 351 | newtime = inl(emu->port + WC) >> 6; |
| 352 | if (newtime != curtime) |
| 353 | break; |
| 354 | } |
| 355 | if (count >= 16384) |
| 356 | break; |
| 357 | curtime = newtime; |
| 358 | } |
| 359 | } |
| 360 | |
Takashi Iwai | eb4698f | 2005-11-17 14:50:13 +0100 | [diff] [blame] | 361 | unsigned short snd_emu10k1_ac97_read(struct snd_ac97 *ac97, unsigned short reg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | { |
Takashi Iwai | eb4698f | 2005-11-17 14:50:13 +0100 | [diff] [blame] | 363 | struct snd_emu10k1 *emu = ac97->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | unsigned long flags; |
| 365 | unsigned short val; |
| 366 | |
| 367 | spin_lock_irqsave(&emu->emu_lock, flags); |
| 368 | outb(reg, emu->port + AC97ADDRESS); |
| 369 | val = inw(emu->port + AC97DATA); |
| 370 | spin_unlock_irqrestore(&emu->emu_lock, flags); |
| 371 | return val; |
| 372 | } |
| 373 | |
Takashi Iwai | eb4698f | 2005-11-17 14:50:13 +0100 | [diff] [blame] | 374 | void snd_emu10k1_ac97_write(struct snd_ac97 *ac97, unsigned short reg, unsigned short data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | { |
Takashi Iwai | eb4698f | 2005-11-17 14:50:13 +0100 | [diff] [blame] | 376 | struct snd_emu10k1 *emu = ac97->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | unsigned long flags; |
| 378 | |
| 379 | spin_lock_irqsave(&emu->emu_lock, flags); |
| 380 | outb(reg, emu->port + AC97ADDRESS); |
| 381 | outw(data, emu->port + AC97DATA); |
| 382 | spin_unlock_irqrestore(&emu->emu_lock, flags); |
| 383 | } |
| 384 | |
| 385 | /* |
| 386 | * convert rate to pitch |
| 387 | */ |
| 388 | |
| 389 | unsigned int snd_emu10k1_rate_to_pitch(unsigned int rate) |
| 390 | { |
| 391 | static u32 logMagTable[128] = { |
| 392 | 0x00000, 0x02dfc, 0x05b9e, 0x088e6, 0x0b5d6, 0x0e26f, 0x10eb3, 0x13aa2, |
| 393 | 0x1663f, 0x1918a, 0x1bc84, 0x1e72e, 0x2118b, 0x23b9a, 0x2655d, 0x28ed5, |
| 394 | 0x2b803, 0x2e0e8, 0x30985, 0x331db, 0x359eb, 0x381b6, 0x3a93d, 0x3d081, |
| 395 | 0x3f782, 0x41e42, 0x444c1, 0x46b01, 0x49101, 0x4b6c4, 0x4dc49, 0x50191, |
| 396 | 0x5269e, 0x54b6f, 0x57006, 0x59463, 0x5b888, 0x5dc74, 0x60029, 0x623a7, |
| 397 | 0x646ee, 0x66a00, 0x68cdd, 0x6af86, 0x6d1fa, 0x6f43c, 0x7164b, 0x73829, |
| 398 | 0x759d4, 0x77b4f, 0x79c9a, 0x7bdb5, 0x7dea1, 0x7ff5e, 0x81fed, 0x8404e, |
| 399 | 0x86082, 0x88089, 0x8a064, 0x8c014, 0x8df98, 0x8fef1, 0x91e20, 0x93d26, |
| 400 | 0x95c01, 0x97ab4, 0x9993e, 0x9b79f, 0x9d5d9, 0x9f3ec, 0xa11d8, 0xa2f9d, |
| 401 | 0xa4d3c, 0xa6ab5, 0xa8808, 0xaa537, 0xac241, 0xadf26, 0xafbe7, 0xb1885, |
| 402 | 0xb3500, 0xb5157, 0xb6d8c, 0xb899f, 0xba58f, 0xbc15e, 0xbdd0c, 0xbf899, |
| 403 | 0xc1404, 0xc2f50, 0xc4a7b, 0xc6587, 0xc8073, 0xc9b3f, 0xcb5ed, 0xcd07c, |
| 404 | 0xceaec, 0xd053f, 0xd1f73, 0xd398a, 0xd5384, 0xd6d60, 0xd8720, 0xda0c3, |
| 405 | 0xdba4a, 0xdd3b4, 0xded03, 0xe0636, 0xe1f4e, 0xe384a, 0xe512c, 0xe69f3, |
| 406 | 0xe829f, 0xe9b31, 0xeb3a9, 0xecc08, 0xee44c, 0xefc78, 0xf148a, 0xf2c83, |
| 407 | 0xf4463, 0xf5c2a, 0xf73da, 0xf8b71, 0xfa2f0, 0xfba57, 0xfd1a7, 0xfe8df |
| 408 | }; |
| 409 | static char logSlopeTable[128] = { |
| 410 | 0x5c, 0x5c, 0x5b, 0x5a, 0x5a, 0x59, 0x58, 0x58, |
| 411 | 0x57, 0x56, 0x56, 0x55, 0x55, 0x54, 0x53, 0x53, |
| 412 | 0x52, 0x52, 0x51, 0x51, 0x50, 0x50, 0x4f, 0x4f, |
| 413 | 0x4e, 0x4d, 0x4d, 0x4d, 0x4c, 0x4c, 0x4b, 0x4b, |
| 414 | 0x4a, 0x4a, 0x49, 0x49, 0x48, 0x48, 0x47, 0x47, |
| 415 | 0x47, 0x46, 0x46, 0x45, 0x45, 0x45, 0x44, 0x44, |
| 416 | 0x43, 0x43, 0x43, 0x42, 0x42, 0x42, 0x41, 0x41, |
| 417 | 0x41, 0x40, 0x40, 0x40, 0x3f, 0x3f, 0x3f, 0x3e, |
| 418 | 0x3e, 0x3e, 0x3d, 0x3d, 0x3d, 0x3c, 0x3c, 0x3c, |
| 419 | 0x3b, 0x3b, 0x3b, 0x3b, 0x3a, 0x3a, 0x3a, 0x39, |
| 420 | 0x39, 0x39, 0x39, 0x38, 0x38, 0x38, 0x38, 0x37, |
| 421 | 0x37, 0x37, 0x37, 0x36, 0x36, 0x36, 0x36, 0x35, |
| 422 | 0x35, 0x35, 0x35, 0x34, 0x34, 0x34, 0x34, 0x34, |
| 423 | 0x33, 0x33, 0x33, 0x33, 0x32, 0x32, 0x32, 0x32, |
| 424 | 0x32, 0x31, 0x31, 0x31, 0x31, 0x31, 0x30, 0x30, |
| 425 | 0x30, 0x30, 0x30, 0x2f, 0x2f, 0x2f, 0x2f, 0x2f |
| 426 | }; |
| 427 | int i; |
| 428 | |
| 429 | if (rate == 0) |
| 430 | return 0; /* Bail out if no leading "1" */ |
| 431 | rate *= 11185; /* Scale 48000 to 0x20002380 */ |
| 432 | for (i = 31; i > 0; i--) { |
| 433 | if (rate & 0x80000000) { /* Detect leading "1" */ |
| 434 | return (((unsigned int) (i - 15) << 20) + |
| 435 | logMagTable[0x7f & (rate >> 24)] + |
| 436 | (0x7f & (rate >> 17)) * |
| 437 | logSlopeTable[0x7f & (rate >> 24)]); |
| 438 | } |
| 439 | rate <<= 1; |
| 440 | } |
| 441 | |
| 442 | return 0; /* Should never reach this point */ |
| 443 | } |
| 444 | |