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Linux/sound/isa/sb/emu8000_patch.c

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  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 }
306 

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