sound/isa/gus/gus_lfo.c

   1 /*
   2  *  Copyright (c) by Jaroslav Kysela <perex@suse.cz>
   3  *  Routines for control of LFO generators (tremolo & vibrato) for
   4  *  GF1/InterWave chips...
   5  *
   6  *
   7  *   This program is free software; you can redistribute it and/or modify
   8  *   it under the terms of the GNU General Public License as published by
   9  *   the Free Software Foundation; either version 2 of the License, or
  10  *   (at your option) any later version.
  11  *
  12  *   This program is distributed in the hope that it will be useful,
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *   GNU General Public License for more details.
  16  *
  17  *   You should have received a copy of the GNU General Public License
  18  *   along with this program; if not, write to the Free Software
  19  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  20  *
  21  */
  22
  23 #include <sound/driver.h>
  24 #include <sound/core.h>
  25 #include <sound/gus.h>
  26
  27 /*
  28  *  called by engine routines
  29  */
  30
  31 static signed char snd_gf1_lfo_compute_value(snd_gus_card_t * gus,
  32                                              unsigned char *ptr)
  33 {
  34         unsigned int twaveinc, depth_delta;
  35         signed int result;
  36         unsigned short control, twave, depth, depth_final;
  37         unsigned char *ptr1;
  38
  39         control = *(unsigned short *) (ptr + 0x00);
  40         ptr1 = ptr + ((control & 0x4000) >> 12);
  41         /* 1. add TWAVEINC to TWAVE and write the result back */
  42         /* LFO update rate is 689Hz, effect timer is in ms */
  43         if (gus->gf1.timer_slave)
  44                 twaveinc = (689 * gus->gf1.timer_master_gus->gf1.effect_timer) / 1000;
  45         else
  46                 twaveinc = (689 * gus->gf1.effect_timer) / 1000;
  47         if (!twaveinc)
  48                 twaveinc++;
  49 #if 0
  50         printk("twaveinc = 0x%x, effect_timer = %i\n", twaveinc, gus->gf1.effect_timer);
  51 #endif
  52
  53         depth = *(unsigned short *) (ptr1 + 0x0a);
  54         depth_final = *(unsigned char *) (ptr + 0x02) << 5;
  55         if (depth != depth_final) {
  56                 depth_delta = ((twaveinc * *(ptr + 0x03)) + *(unsigned short *) (ptr + 0x04));
  57                 *(unsigned short *) (ptr + 0x04) = depth_delta % 8000;
  58                 depth_delta /= 8000;
  59                 if (depth < depth_final) {
  60                         if (depth + depth_delta > depth_final)
  61                                 depth = depth_final;
  62                         else
  63                                 depth += depth_delta;
  64                 }
  65                 if (depth > depth_final) {
  66                         if (depth - depth_delta < depth_final)
  67                                 depth = depth_final;
  68                         else
  69                                 depth -= depth_delta;
  70                 }
  71                 *(unsigned short *) (ptr1 + 0x0a) = depth;
  72         }
  73         twaveinc *= (unsigned int) control & 0x7ff;
  74         twaveinc += *(unsigned short *) (ptr + 0x06);
  75         *(unsigned short *) (ptr + 0x06) = twaveinc % 1000;
  76
  77         twave = *(unsigned short *) (ptr1 + 0x08);
  78         twave += (unsigned short) (twaveinc / (unsigned int) 1000);
  79         *(unsigned short *) (ptr1 + 0x08) = twave;
  80
  81         if (!(control & 0x2000)) {
  82                 /* 2. if shift is low */
  83                 if (twave & 0x4000) {   /* bit 14 high -> invert TWAVE 13-0 */
  84                         twave ^= 0x3fff;
  85                         twave &= ~0x4000;
  86                 }
  87                 /* TWAVE bit 15 is exclusive or'd with the invert bit (12) */
  88                 twave ^= (control & 0x1000) << 3;
  89         } else {
  90                 /* 2. if shift is high */
  91                 if (twave & 0x8000)     /* bit 15 high -> invert TWAVE 14-0 */
  92                         twave ^= 0x7fff;
  93                 /* the invert bit (12) is used as sign bit */
  94                 if (control & 0x1000)
  95                         twave |= 0x8000;
  96                 else
  97                         twave &= ~0x8000;
  98         }
  99         /* 3. multiply the 14-bit LFO waveform magnitude by 13-bit DEPTH */
 100 #if 0
 101         printk("c=0x%x,tw=0x%x,to=0x%x,d=0x%x,df=0x%x,di=0x%x,r=0x%x,r1=%i\n",
 102                control, twave,
 103                *(unsigned short *) (ptr1 + 0x08),
 104                depth, depth_final, *(ptr + 0x03),
 105              (twave & 0x7fff) * depth, ((twave & 0x7fff) * depth) >> 21);
 106 #endif
 107         result = (twave & 0x7fff) * depth;
 108         if (result) {
 109                 /* shift */
 110                 result >>= 21;
 111                 result &= 0x3f;
 112         }
 113         /* add sign */
 114         if (twave & 0x8000)
 115                 result = -result;
 116 #if 0
 117         printk("lfo final value = %i\n", result);
 118 #endif
 119         return result;
 120 }
 121
 122 static void snd_gf1_lfo_register_setup(snd_gus_card_t * gus,
 123                                        snd_gf1_voice_t * voice,
 124                                        int lfo_type)
 125 {
 126         unsigned long flags;
 127
 128         if (gus->gf1.enh_mode) {
 129                 CLI(&flags);
 130                 gf1_select_voice(gus, voice->number);
 131                 if (lfo_type & 1) {
 132                         snd_gf1_write8(gus, GF1_VB_FREQUENCY_LFO, voice->lfo_fc);
 133                         voice->lfo_fc = 0;
 134                 }
 135                 if (lfo_type & 2) {
 136                         snd_gf1_write8(gus, GF1_VB_VOLUME_LFO, voice->lfo_volume);
 137                         voice->lfo_volume = 0;
 138                 }
 139                 STI(&flags);
 140         } else {
 141                 /*
 142                  * ok.. with old GF1 chip can be only vibrato emulated...
 143                  * volume register can be in volume ramp state, so tremolo isn't simple..
 144                  */
 145                 if (!(lfo_type & 1))
 146                         return;
 147 #if 0
 148                 if (voice->lfo_fc)
 149                         printk("setup - %i = %i\n", voice->number, voice->lfo_fc);
 150 #endif
 151                 CLI(&flags);
 152                 gf1_select_voice(gus, voice->number);
 153                 snd_gf1_write16(gus, GF1_VW_FREQUENCY, voice->fc_register + voice->lfo_fc);
 154                 STI(&flags);
 155         }
 156 }
 157
 158 void snd_gf1_lfo_effect_interrupt(snd_gus_card_t * gus, snd_gf1_voice_t * voice)
 159 {
 160         unsigned char *ptr;
 161
 162 #if 0
 163         if (voice->number != 0)
 164                 return;
 165 #endif
 166         ptr = gus->gf1.lfos + ((voice->number) << 5);
 167         /* 1. vibrato */
 168         if (*(unsigned short *) (ptr + 0x00) & 0x8000)
 169                 voice->lfo_fc = snd_gf1_lfo_compute_value(gus, ptr);
 170         /* 2. tremolo */
 171         ptr += 16;
 172         if (*(unsigned short *) (ptr + 0x00) & 0x8000)
 173                 voice->lfo_volume = snd_gf1_lfo_compute_value(gus, ptr);
 174         /* 3. register setup */
 175         snd_gf1_lfo_register_setup(gus, voice, 3);
 176 }
 177
 178 /*
 179
 180  */
 181
 182 void snd_gf1_lfo_init(snd_gus_card_t * gus)
 183 {
 184         if (gus->gf1.hw_lfo) {
 185                 snd_gf1_i_write16(gus, GF1_GW_LFO_BASE, 0x0000);
 186                 snd_gf1_dram_setmem(gus, 0, 0x0000, 1024);
 187                 /* now enable LFO */
 188                 snd_gf1_i_write8(gus, GF1_GB_GLOBAL_MODE, snd_gf1_i_look8(gus, GF1_GB_GLOBAL_MODE) | 0x02);
 189         }
 190         if (gus->gf1.sw_lfo) {
 191 #if 1
 192                 gus->gf1.lfos = snd_calloc(1024);
 193                 if (!gus->gf1.lfos)
 194 #endif
 195                         gus->gf1.sw_lfo = 0;
 196         }
 197 }
 198
 199 void snd_gf1_lfo_done(snd_gus_card_t * gus)
 200 {
 201         if (gus->gf1.sw_lfo) {
 202                 if (gus->gf1.lfos) {
 203                         snd_gf1_free(gus->gf1.lfos, 1024);
 204                         gus->gf1.lfos = NULL;
 205                 }
 206         }
 207 }
 208
 209 void snd_gf1_lfo_program(snd_gus_card_t * gus, int voice, int lfo_type,
 210                          struct ULTRA_STRU_IW_LFO_PROGRAM *program)
 211 {
 212         unsigned int lfo_addr, wave_select;
 213
 214         wave_select = (program->freq_and_control & 0x4000) >> 12;
 215         lfo_addr = (voice << 5) | (lfo_type << 4);
 216         if (gus->gf1.hw_lfo) {
 217 #if 0
 218                 printk("LMCI = 0x%x\n", snd_gf1_i_look8(gus, 0x53));
 219                 printk("lfo_program: lfo_addr=0x%x,wave_sel=0x%x,fac=0x%x,df=0x%x,di=0x%x,twave=0x%x,depth=0x%x\n",
 220                        lfo_addr, wave_select,
 221                        program->freq_and_control,
 222                        program->depth_final,
 223                        program->depth_inc,
 224                        program->twave,
 225                        program->depth);
 226 #endif
 227                 snd_gf1_poke(gus, lfo_addr + 0x02, program->depth_final);
 228                 snd_gf1_poke(gus, lfo_addr + 0x03, program->depth_inc);
 229                 snd_gf1_pokew(gus, lfo_addr + 0x08 + wave_select, program->twave);
 230                 snd_gf1_pokew(gus, lfo_addr + 0x0a + wave_select, program->depth);
 231                 snd_gf1_pokew(gus, lfo_addr + 0x00, program->freq_and_control);
 232 #if 0
 233                 {
 234                         int i = 0;
 235                         for (i = 0; i < 16; i++)
 236                                 printk("%02x:", snd_gf1_peek(gus, lfo_addr + i));
 237                         printk("\n");
 238                 }
 239 #endif
 240         }
 241         if (gus->gf1.sw_lfo) {
 242                 unsigned char *ptr = gus->gf1.lfos + lfo_addr;
 243
 244                 *(ptr + 0x02) = program->depth_final;
 245                 *(ptr + 0x03) = program->depth_inc;
 246                 *(unsigned short *) (ptr + 0x08 + wave_select) = program->twave;
 247                 *(unsigned short *) (ptr + 0x0a + wave_select) = program->depth;
 248                 *(unsigned short *) (ptr + 0x00) = program->freq_and_control;
 249         }
 250 }
 251
 252 void snd_gf1_lfo_enable(snd_gus_card_t * gus, int voice, int lfo_type)
 253 {
 254         unsigned int lfo_addr;
 255
 256         lfo_addr = (voice << 5) | (lfo_type << 4);
 257         if (gus->gf1.hw_lfo)
 258                 snd_gf1_pokew(gus, lfo_addr + 0x00, snd_gf1_peekw(gus, lfo_addr + 0x00) | 0x8000);
 259         if (gus->gf1.sw_lfo) {
 260                 unsigned char *ptr = gus->gf1.lfos + lfo_addr;
 261
 262                 *(unsigned short *) (ptr + 0x00) |= 0x8000;
 263         }
 264 }
 265
 266 void snd_gf1_lfo_disable(snd_gus_card_t * gus, int voice, int lfo_type)
 267 {
 268         unsigned int lfo_addr;
 269
 270         lfo_addr = (voice << 5) | (lfo_type << 4);
 271         if (gus->gf1.hw_lfo)
 272                 snd_gf1_pokew(gus, lfo_addr + 0x00,
 273                                 snd_gf1_peekw(gus, lfo_addr + 0x00) & ~0x8000);
 274         if (gus->gf1.sw_lfo) {
 275                 unsigned char *ptr = gus->gf1.lfos + lfo_addr;
 276
 277                 *(unsigned short *) (ptr + 0x00) &= ~0x8000;
 278         }
 279 }
 280
 281 void snd_gf1_lfo_change_freq(snd_gus_card_t * gus, int voice,
 282                              int lfo_type, int freq)
 283 {
 284         unsigned int lfo_addr;
 285
 286         lfo_addr = (voice << 5) | (lfo_type << 4);
 287         if (gus->gf1.hw_lfo)
 288                 snd_gf1_pokew(gus, lfo_addr + 0x00,
 289                                 (snd_gf1_peekw(gus, lfo_addr + 0x00) & ~0x7ff) | (freq & 0x7ff));
 290         if (gus->gf1.sw_lfo) {
 291                 unsigned long flags;
 292                 unsigned char *ptr = gus->gf1.lfos + lfo_addr;
 293
 294                 CLI(&flags);
 295                 *(unsigned short *) (ptr + 0x00) &= ~0x7ff;
 296                 *(unsigned short *) (ptr + 0x00) |= freq & 0x7ff;
 297                 STI(&flags);
 298         }
 299 }
 300
 301 void snd_gf1_lfo_change_depth(snd_gus_card_t * gus, int voice,
 302                               int lfo_type, int depth)
 303 {
 304         unsigned long flags;
 305         unsigned int lfo_addr;
 306         unsigned short control = 0;
 307         unsigned char *ptr;
 308
 309         lfo_addr = (voice << 5) | (lfo_type << 4);
 310         ptr = gus->gf1.lfos + lfo_addr;
 311         if (gus->gf1.hw_lfo)
 312                 control = snd_gf1_peekw(gus, lfo_addr + 0x00);
 313         if (gus->gf1.sw_lfo)
 314                 control = *(unsigned short *) (ptr + 0x00);
 315         if (depth < 0) {
 316                 control |= 0x1000;
 317                 depth = -depth;
 318         } else
 319                 control &= ~0x1000;
 320         if (gus->gf1.hw_lfo) {
 321                 CLI(&flags);
 322                 snd_gf1_poke(gus, lfo_addr + 0x02, (unsigned char) depth);
 323                 snd_gf1_pokew(gus, lfo_addr + 0x0a + ((control & 0x4000) >> 12), depth << 5);
 324                 snd_gf1_pokew(gus, lfo_addr + 0x00, control);
 325                 STI(&flags);
 326         }
 327         if (gus->gf1.sw_lfo) {
 328                 unsigned char *ptr = gus->gf1.lfos + lfo_addr;
 329
 330                 CLI(&flags);
 331                 *(ptr + 0x02) = (unsigned char) depth;
 332                 *(unsigned short *) (ptr + 0x0a + ((control & 0x4000) >> 12)) = depth << 5;
 333                 *(unsigned short *) (ptr + 0x00) = control;
 334                 STI(&flags);
 335         }
 336 }
 337
 338 void snd_gf1_lfo_setup(snd_gus_card_t * gus, int voice, int lfo_type,
 339                        int freq, int current_depth, int depth, int sweep,
 340                        int shape)
 341 {
 342         struct ULTRA_STRU_IW_LFO_PROGRAM program;
 343
 344         program.freq_and_control = 0x8000 | (freq & 0x7ff);
 345         if (shape & ULTRA_STRU_IW_LFO_SHAPE_POSTRIANGLE)
 346                 program.freq_and_control |= 0x2000;
 347         if (depth < 0) {
 348                 program.freq_and_control |= 0x1000;
 349                 depth = -depth;
 350         }
 351         program.twave = 0;
 352         program.depth = current_depth;
 353         program.depth_final = depth;
 354         if (sweep) {
 355                 program.depth_inc = (unsigned char) (((int) ((depth << 5) - current_depth) << 9) / (sweep * 4410L));
 356                 if (!program.depth_inc)
 357                         program.depth_inc++;
 358         } else
 359                 program.depth = (unsigned short) (depth << 5);
 360         snd_gf1_lfo_program(gus, voice, lfo_type, &program);
 361 }
 362
 363 void snd_gf1_lfo_shutdown(snd_gus_card_t * gus, int voice, int lfo_type)
 364 {
 365         unsigned long flags;
 366         unsigned int lfo_addr;
 367
 368         lfo_addr = (voice << 5) | (lfo_type << 4);
 369         if (gus->gf1.hw_lfo) {
 370                 snd_gf1_pokew(gus, lfo_addr + 0x00, 0x0000);
 371                 CLI(&flags);
 372                 gf1_select_voice(gus, voice);
 373                 snd_gf1_write8(gus, lfo_type == ULTRA_LFO_VIBRATO ? GF1_VB_FREQUENCY_LFO : GF1_VB_VOLUME_LFO, 0);
 374                 STI(&flags);
 375         }
 376         if (gus->gf1.sw_lfo) {
 377                 unsigned char *ptr = gus->gf1.lfos + lfo_addr;
 378                 snd_gf1_voice_t *pvoice;
 379
 380                 *(unsigned short *) (ptr + 0x00) = 0;
 381                 *(unsigned short *) (ptr + 0x04) = 0;
 382                 *(unsigned short *) (ptr + 0x06) = 0;
 383                 if (gus->gf1.syn_voices) {
 384                         pvoice = gus->gf1.syn_voices + voice;
 385                         if (lfo_type == ULTRA_LFO_VIBRATO)
 386                                 pvoice->lfo_fc = 0;
 387                         else
 388                                 pvoice->lfo_volume = 0;
 389                         snd_gf1_lfo_register_setup(gus, pvoice, lfo_type == ULTRA_LFO_VIBRATO ? 1 : 2);
 390                 } else if (gus->gf1.enh_mode) {
 391                         CLI(&flags);
 392                         gf1_select_voice(gus, voice);
 393                         snd_gf1_write8(gus, lfo_type == ULTRA_LFO_VIBRATO ? GF1_VB_FREQUENCY_LFO : GF1_VB_VOLUME_LFO, 0);
 394                         STI(&flags);
 395                 }
 396         }
 397 }
 398
 399 void snd_gf1_lfo_command(snd_gus_card_t * gus, int voice, unsigned char *data)
 400 {
 401         int lfo_type;
 402         int lfo_command;
 403         int temp1, temp2;
 404
 405         lfo_type = *data >> 7;
 406         lfo_command = *data & 0x7f;
 407         switch (lfo_command) {
 408         case ULTRA_LFO_SETUP:   /* setup */
 409                 temp1 = snd_gf1_get_word(data, 2);
 410                 temp2 = snd_gf1_get_word(data, 4);
 411                 snd_gf1_lfo_setup(gus, voice, lfo_type, temp1 & 0x7ff, 0, temp2 > 255 ? 255 : temp2, snd_gf1_get_byte(data, 1), (temp1 & 0x2000) >> 13);
 412                 break;
 413         case ULTRA_LFO_FREQ:    /* freq */
 414                 snd_gf1_lfo_change_depth(gus, voice, lfo_type, snd_gf1_get_word(data, 2));
 415                 break;
 416         case ULTRA_LFO_DEPTH:   /* depth */
 417                 snd_gf1_lfo_change_freq(gus, voice, lfo_type, snd_gf1_get_word(data, 2));
 418                 break;
 419         case ULTRA_LFO_ENABLE:  /* enable */
 420                 snd_gf1_lfo_enable(gus, voice, lfo_type);
 421                 break;
 422         case ULTRA_LFO_DISABLE: /* disable */
 423                 snd_gf1_lfo_disable(gus, voice, lfo_type);
 424                 break;
 425         case ULTRA_LFO_SHUTDOWN:        /* shutdown */
 426                 snd_gf1_lfo_shutdown(gus, voice, lfo_type);
 427                 break;
 428         }
 429 }