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

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