sound/isa/sb/emu8000_patch.c

   1 /*
   2  *  Patch routines for the emu8000 (AWE32/64)
   3  *
   4  *  Copyright (C) 1999 Steve Ratcliffe
   5  *  Copyright (C) 1999-2000 Takashi Iwai <tiwai@suse.de>
   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 #include "emu8000_local.h"
  23 #include <linux/uaccess.h>
  24 #include <linux/moduleparam.h>
  25
  26 static int emu8000_reset_addr;
  27 module_param(emu8000_reset_addr, int, 0444);
  28 MODULE_PARM_DESC(emu8000_reset_addr, "reset write address at each time (makes slowdown)");
  29
  30
  31 /*
  32  * Open up channels.
  33  */
  34 static int
  35 snd_emu8000_open_dma(struct snd_emu8000 *emu, int write)
  36 {
  37         int i;
  38
  39         /* reserve all 30 voices for loading */
  40         for (i = 0; i < EMU8000_DRAM_VOICES; i++) {
  41                 snd_emux_lock_voice(emu->emu, i);
  42                 snd_emu8000_dma_chan(emu, i, write);
  43         }
  44
  45         /* assign voice 31 and 32 to ROM */
  46         EMU8000_VTFT_WRITE(emu, 30, 0);
  47         EMU8000_PSST_WRITE(emu, 30, 0x1d8);
  48         EMU8000_CSL_WRITE(emu, 30, 0x1e0);
  49         EMU8000_CCCA_WRITE(emu, 30, 0x1d8);
  50         EMU8000_VTFT_WRITE(emu, 31, 0);
  51         EMU8000_PSST_WRITE(emu, 31, 0x1d8);
  52         EMU8000_CSL_WRITE(emu, 31, 0x1e0);
  53         EMU8000_CCCA_WRITE(emu, 31, 0x1d8);
  54
  55         return 0;
  56 }
  57
  58 /*
  59  * Close all dram channels.
  60  */
  61 static void
  62 snd_emu8000_close_dma(struct snd_emu8000 *emu)
  63 {
  64         int i;
  65
  66         for (i = 0; i < EMU8000_DRAM_VOICES; i++) {
  67                 snd_emu8000_dma_chan(emu, i, EMU8000_RAM_CLOSE);
  68                 snd_emux_unlock_voice(emu->emu, i);
  69         }
  70 }
  71
  72 /*
  73  */
  74
  75 #define BLANK_LOOP_START        4
  76 #define BLANK_LOOP_END          8
  77 #define BLANK_LOOP_SIZE         12
  78 #define BLANK_HEAD_SIZE         48
  79
  80 /*
  81  * Read a word from userland, taking care of conversions from
  82  * 8bit samples etc.
  83  */
  84 static unsigned short
  85 read_word(const void __user *buf, int offset, int mode)
  86 {
  87         unsigned short c;
  88         if (mode & SNDRV_SFNT_SAMPLE_8BITS) {
  89                 unsigned char cc;
  90                 get_user(cc, (unsigned char __user *)buf + offset);
  91                 c = cc << 8; /* convert 8bit -> 16bit */
  92         } else {
  93 #ifdef SNDRV_LITTLE_ENDIAN
  94                 get_user(c, (unsigned short __user *)buf + offset);
  95 #else
  96                 unsigned short cc;
  97                 get_user(cc, (unsigned short __user *)buf + offset);
  98                 c = swab16(cc);
  99 #endif
 100         }
 101         if (mode & SNDRV_SFNT_SAMPLE_UNSIGNED)
 102                 c ^= 0x8000; /* unsigned -> signed */
 103         return c;
 104 }
 105
 106 /*
 107  */
 108 static void
 109 snd_emu8000_write_wait(struct snd_emu8000 *emu)
 110 {
 111         while ((EMU8000_SMALW_READ(emu) & 0x80000000) != 0) {
 112                 schedule_timeout_interruptible(1);
 113                 if (signal_pending(current))
 114                         break;
 115         }
 116 }
 117
 118 /*
 119  * write sample word data
 120  *
 121  * You should not have to keep resetting the address each time
 122  * as the chip is supposed to step on the next address automatically.
 123  * It mostly does, but during writes of some samples at random it
 124  * completely loses words (every one in 16 roughly but with no
 125  * obvious pattern).
 126  *
 127  * This is therefore much slower than need be, but is at least
 128  * working.
 129  */
 130 static inline void
 131 write_word(struct snd_emu8000 *emu, int *offset, unsigned short data)
 132 {
 133         if (emu8000_reset_addr) {
 134                 if (emu8000_reset_addr > 1)
 135                         snd_emu8000_write_wait(emu);
 136                 EMU8000_SMALW_WRITE(emu, *offset);
 137         }
 138         EMU8000_SMLD_WRITE(emu, data);
 139         *offset += 1;
 140 }
 141
 142 /*
 143  * Write the sample to EMU800 memory.  This routine is invoked out of
 144  * the generic soundfont routines as a callback.
 145  */
 146 int
 147 snd_emu8000_sample_new(struct snd_emux *rec, struct snd_sf_sample *sp,
 148                        struct snd_util_memhdr *hdr,
 149                        const void __user *data, long count)
 150 {
 151         int  i;
 152         int  rc;
 153         int  offset;
 154         int  truesize;
 155         int  dram_offset, dram_start;
 156         struct snd_emu8000 *emu;
 157
 158         emu = rec->hw;
 159         if (snd_BUG_ON(!sp))
 160                 return -EINVAL;
 161
 162         if (sp->v.size == 0)
 163                 return 0;
 164
 165         /* be sure loop points start < end */
 166         if (sp->v.loopstart > sp->v.loopend) {
 167                 int tmp = sp->v.loopstart;
 168                 sp->v.loopstart = sp->v.loopend;
 169                 sp->v.loopend = tmp;
 170         }
 171
 172         /* compute true data size to be loaded */
 173         truesize = sp->v.size;
 174         if (sp->v.mode_flags & (SNDRV_SFNT_SAMPLE_BIDIR_LOOP|SNDRV_SFNT_SAMPLE_REVERSE_LOOP))
 175                 truesize += sp->v.loopend - sp->v.loopstart;
 176         if (sp->v.mode_flags & SNDRV_SFNT_SAMPLE_NO_BLANK)
 177                 truesize += BLANK_LOOP_SIZE;
 178
 179         sp->block = snd_util_mem_alloc(hdr, truesize * 2);
 180         if (sp->block == NULL) {
 181                 /*snd_printd("EMU8000: out of memory\n");*/
 182                 /* not ENOMEM (for compatibility) */
 183                 return -ENOSPC;
 184         }
 185
 186         if (sp->v.mode_flags & SNDRV_SFNT_SAMPLE_8BITS) {
 187                 if (!access_ok(VERIFY_READ, data, sp->v.size))
 188                         return -EFAULT;
 189         } else {
 190                 if (!access_ok(VERIFY_READ, data, sp->v.size * 2))
 191                         return -EFAULT;
 192         }
 193
 194         /* recalculate address offset */
 195         sp->v.end -= sp->v.start;
 196         sp->v.loopstart -= sp->v.start;
 197         sp->v.loopend -= sp->v.start;
 198         sp->v.start = 0;
 199
 200         /* dram position (in word) -- mem_offset is byte */
 201         dram_offset = EMU8000_DRAM_OFFSET + (sp->block->offset >> 1);
 202         dram_start = dram_offset;
 203
 204         /* set the total size (store onto obsolete checksum value) */
 205         sp->v.truesize = truesize * 2; /* in bytes */
 206
 207         snd_emux_terminate_all(emu->emu);
 208         if ((rc = snd_emu8000_open_dma(emu, EMU8000_RAM_WRITE)) != 0)
 209                 return rc;
 210
 211         /* Set the address to start writing at */
 212         snd_emu8000_write_wait(emu);
 213         EMU8000_SMALW_WRITE(emu, dram_offset);
 214
 215         /*snd_emu8000_init_fm(emu);*/
 216
 217 #if 0
 218         /* first block - write 48 samples for silence */
 219         if (! sp->block->offset) {
 220                 for (i = 0; i < BLANK_HEAD_SIZE; i++) {
 221                         write_word(emu, &dram_offset, 0);
 222                 }
 223         }
 224 #endif
 225
 226         offset = 0;
 227         for (i = 0; i < sp->v.size; i++) {
 228                 unsigned short s;
 229
 230                 s = read_word(data, offset, sp->v.mode_flags);
 231                 offset++;
 232                 write_word(emu, &dram_offset, s);
 233
 234                 /* we may take too long time in this loop.
 235                  * so give controls back to kernel if needed.
 236                  */
 237                 cond_resched();
 238
 239                 if (i == sp->v.loopend &&
 240                     (sp->v.mode_flags & (SNDRV_SFNT_SAMPLE_BIDIR_LOOP|SNDRV_SFNT_SAMPLE_REVERSE_LOOP)))
 241                 {
 242                         int looplen = sp->v.loopend - sp->v.loopstart;
 243                         int k;
 244
 245                         /* copy reverse loop */
 246                         for (k = 1; k <= looplen; k++) {
 247                                 s = read_word(data, offset - k, sp->v.mode_flags);
 248                                 write_word(emu, &dram_offset, s);
 249                         }
 250                         if (sp->v.mode_flags & SNDRV_SFNT_SAMPLE_BIDIR_LOOP) {
 251                                 sp->v.loopend += looplen;
 252                         } else {
 253                                 sp->v.loopstart += looplen;
 254                                 sp->v.loopend += looplen;
 255                         }
 256                         sp->v.end += looplen;
 257                 }
 258         }
 259
 260         /* if no blank loop is attached in the sample, add it */
 261         if (sp->v.mode_flags & SNDRV_SFNT_SAMPLE_NO_BLANK) {
 262                 for (i = 0; i < BLANK_LOOP_SIZE; i++) {
 263                         write_word(emu, &dram_offset, 0);
 264                 }
 265                 if (sp->v.mode_flags & SNDRV_SFNT_SAMPLE_SINGLESHOT) {
 266                         sp->v.loopstart = sp->v.end + BLANK_LOOP_START;
 267                         sp->v.loopend = sp->v.end + BLANK_LOOP_END;
 268                 }
 269         }
 270
 271         /* add dram offset */
 272         sp->v.start += dram_start;
 273         sp->v.end += dram_start;
 274         sp->v.loopstart += dram_start;
 275         sp->v.loopend += dram_start;
 276
 277         snd_emu8000_close_dma(emu);
 278         snd_emu8000_init_fm(emu);
 279
 280         return 0;
 281 }
 282
 283 /*
 284  * free a sample block
 285  */
 286 int
 287 snd_emu8000_sample_free(struct snd_emux *rec, struct snd_sf_sample *sp,
 288                         struct snd_util_memhdr *hdr)
 289 {
 290         if (sp->block) {
 291                 snd_util_mem_free(hdr, sp->block);
 292                 sp->block = NULL;
 293         }
 294         return 0;
 295 }
 296
 297
 298 /*
 299  * sample_reset callback - terminate voices
 300  */
 301 void
 302 snd_emu8000_sample_reset(struct snd_emux *rec)
 303 {
 304         snd_emux_terminate_all(rec);
 305 }