1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Patch routines for the emu8000 (AWE32/64)
4 *
5 * Copyright (C) 1999 Steve Ratcliffe
6 * Copyright (C) 1999-2000 Takashi Iwai <tiwai@suse.de>
7 */
8
9 #include "emu8000_local.h"
10
11 #include <linux/sched/signal.h>
12 #include <linux/uaccess.h>
13 #include <linux/moduleparam.h>
14
15 static int emu8000_reset_addr;
16 module_param(emu8000_reset_addr, int, 0444);
17 MODULE_PARM_DESC(emu8000_reset_addr, "reset write address at each time (makes slowdown)");
18
19
20 /*
21 * Open up channels.
22 */
23 static int
snd_emu8000_open_dma(struct snd_emu8000 * emu,int write)24 snd_emu8000_open_dma(struct snd_emu8000 *emu, int write)
25 {
26 int i;
27
28 /* reserve all 30 voices for loading */
29 for (i = 0; i < EMU8000_DRAM_VOICES; i++) {
30 snd_emux_lock_voice(emu->emu, i);
31 snd_emu8000_dma_chan(emu, i, write);
32 }
33
34 /* assign voice 31 and 32 to ROM */
35 EMU8000_VTFT_WRITE(emu, 30, 0);
36 EMU8000_PSST_WRITE(emu, 30, 0x1d8);
37 EMU8000_CSL_WRITE(emu, 30, 0x1e0);
38 EMU8000_CCCA_WRITE(emu, 30, 0x1d8);
39 EMU8000_VTFT_WRITE(emu, 31, 0);
40 EMU8000_PSST_WRITE(emu, 31, 0x1d8);
41 EMU8000_CSL_WRITE(emu, 31, 0x1e0);
42 EMU8000_CCCA_WRITE(emu, 31, 0x1d8);
43
44 return 0;
45 }
46
47 /*
48 * Close all dram channels.
49 */
50 static void
snd_emu8000_close_dma(struct snd_emu8000 * emu)51 snd_emu8000_close_dma(struct snd_emu8000 *emu)
52 {
53 int i;
54
55 for (i = 0; i < EMU8000_DRAM_VOICES; i++) {
56 snd_emu8000_dma_chan(emu, i, EMU8000_RAM_CLOSE);
57 snd_emux_unlock_voice(emu->emu, i);
58 }
59 }
60
61 /*
62 */
63
64 #define BLANK_LOOP_START 4
65 #define BLANK_LOOP_END 8
66 #define BLANK_LOOP_SIZE 12
67 #define BLANK_HEAD_SIZE 48
68
69 /*
70 * Read a word from userland, taking care of conversions from
71 * 8bit samples etc.
72 */
73 static unsigned short
read_word(const void __user * buf,int offset,int mode)74 read_word(const void __user *buf, int offset, int mode)
75 {
76 unsigned short c;
77 if (mode & SNDRV_SFNT_SAMPLE_8BITS) {
78 unsigned char cc;
79 get_user(cc, (unsigned char __user *)buf + offset);
80 c = cc << 8; /* convert 8bit -> 16bit */
81 } else {
82 #ifdef SNDRV_LITTLE_ENDIAN
83 get_user(c, (unsigned short __user *)buf + offset);
84 #else
85 unsigned short cc;
86 get_user(cc, (unsigned short __user *)buf + offset);
87 c = swab16(cc);
88 #endif
89 }
90 if (mode & SNDRV_SFNT_SAMPLE_UNSIGNED)
91 c ^= 0x8000; /* unsigned -> signed */
92 return c;
93 }
94
95 /*
96 */
97 static void
snd_emu8000_write_wait(struct snd_emu8000 * emu)98 snd_emu8000_write_wait(struct snd_emu8000 *emu)
99 {
100 while ((EMU8000_SMALW_READ(emu) & 0x80000000) != 0) {
101 schedule_timeout_interruptible(1);
102 if (signal_pending(current))
103 break;
104 }
105 }
106
107 /*
108 * write sample word data
109 *
110 * You should not have to keep resetting the address each time
111 * as the chip is supposed to step on the next address automatically.
112 * It mostly does, but during writes of some samples at random it
113 * completely loses words (every one in 16 roughly but with no
114 * obvious pattern).
115 *
116 * This is therefore much slower than need be, but is at least
117 * working.
118 */
119 static inline void
write_word(struct snd_emu8000 * emu,int * offset,unsigned short data)120 write_word(struct snd_emu8000 *emu, int *offset, unsigned short data)
121 {
122 if (emu8000_reset_addr) {
123 if (emu8000_reset_addr > 1)
124 snd_emu8000_write_wait(emu);
125 EMU8000_SMALW_WRITE(emu, *offset);
126 }
127 EMU8000_SMLD_WRITE(emu, data);
128 *offset += 1;
129 }
130
131 /*
132 * Write the sample to EMU800 memory. This routine is invoked out of
133 * the generic soundfont routines as a callback.
134 */
135 int
snd_emu8000_sample_new(struct snd_emux * rec,struct snd_sf_sample * sp,struct snd_util_memhdr * hdr,const void __user * data,long count)136 snd_emu8000_sample_new(struct snd_emux *rec, struct snd_sf_sample *sp,
137 struct snd_util_memhdr *hdr,
138 const void __user *data, long count)
139 {
140 int i;
141 int rc;
142 int offset;
143 int truesize;
144 int dram_offset, dram_start;
145 struct snd_emu8000 *emu;
146
147 emu = rec->hw;
148 if (snd_BUG_ON(!sp))
149 return -EINVAL;
150
151 if (sp->v.size == 0)
152 return 0;
153
154 /* be sure loop points start < end */
155 if (sp->v.loopstart > sp->v.loopend)
156 swap(sp->v.loopstart, sp->v.loopend);
157
158 /* compute true data size to be loaded */
159 truesize = sp->v.size;
160 if (sp->v.mode_flags & (SNDRV_SFNT_SAMPLE_BIDIR_LOOP|SNDRV_SFNT_SAMPLE_REVERSE_LOOP))
161 truesize += sp->v.loopend - sp->v.loopstart;
162 if (sp->v.mode_flags & SNDRV_SFNT_SAMPLE_NO_BLANK)
163 truesize += BLANK_LOOP_SIZE;
164
165 sp->block = snd_util_mem_alloc(hdr, truesize * 2);
166 if (sp->block == NULL) {
167 /*snd_printd("EMU8000: out of memory\n");*/
168 /* not ENOMEM (for compatibility) */
169 return -ENOSPC;
170 }
171
172 if (sp->v.mode_flags & SNDRV_SFNT_SAMPLE_8BITS) {
173 if (!access_ok(data, sp->v.size))
174 return -EFAULT;
175 } else {
176 if (!access_ok(data, sp->v.size * 2))
177 return -EFAULT;
178 }
179
180 /* recalculate address offset */
181 sp->v.end -= sp->v.start;
182 sp->v.loopstart -= sp->v.start;
183 sp->v.loopend -= sp->v.start;
184 sp->v.start = 0;
185
186 /* dram position (in word) -- mem_offset is byte */
187 dram_offset = EMU8000_DRAM_OFFSET + (sp->block->offset >> 1);
188 dram_start = dram_offset;
189
190 /* set the total size (store onto obsolete checksum value) */
191 sp->v.truesize = truesize * 2; /* in bytes */
192
193 snd_emux_terminate_all(emu->emu);
194 rc = snd_emu8000_open_dma(emu, EMU8000_RAM_WRITE);
195 if (rc)
196 return rc;
197
198 /* Set the address to start writing at */
199 snd_emu8000_write_wait(emu);
200 EMU8000_SMALW_WRITE(emu, dram_offset);
201
202 /*snd_emu8000_init_fm(emu);*/
203
204 #if 0
205 /* first block - write 48 samples for silence */
206 if (! sp->block->offset) {
207 for (i = 0; i < BLANK_HEAD_SIZE; i++) {
208 write_word(emu, &dram_offset, 0);
209 }
210 }
211 #endif
212
213 offset = 0;
214 for (i = 0; i < sp->v.size; i++) {
215 unsigned short s;
216
217 s = read_word(data, offset, sp->v.mode_flags);
218 offset++;
219 write_word(emu, &dram_offset, s);
220
221 /* we may take too long time in this loop.
222 * so give controls back to kernel if needed.
223 */
224 cond_resched();
225
226 if (i == sp->v.loopend &&
227 (sp->v.mode_flags & (SNDRV_SFNT_SAMPLE_BIDIR_LOOP|SNDRV_SFNT_SAMPLE_REVERSE_LOOP)))
228 {
229 int looplen = sp->v.loopend - sp->v.loopstart;
230 int k;
231
232 /* copy reverse loop */
233 for (k = 1; k <= looplen; k++) {
234 s = read_word(data, offset - k, sp->v.mode_flags);
235 write_word(emu, &dram_offset, s);
236 }
237 if (sp->v.mode_flags & SNDRV_SFNT_SAMPLE_BIDIR_LOOP) {
238 sp->v.loopend += looplen;
239 } else {
240 sp->v.loopstart += looplen;
241 sp->v.loopend += looplen;
242 }
243 sp->v.end += looplen;
244 }
245 }
246
247 /* if no blank loop is attached in the sample, add it */
248 if (sp->v.mode_flags & SNDRV_SFNT_SAMPLE_NO_BLANK) {
249 for (i = 0; i < BLANK_LOOP_SIZE; i++) {
250 write_word(emu, &dram_offset, 0);
251 }
252 if (sp->v.mode_flags & SNDRV_SFNT_SAMPLE_SINGLESHOT) {
253 sp->v.loopstart = sp->v.end + BLANK_LOOP_START;
254 sp->v.loopend = sp->v.end + BLANK_LOOP_END;
255 }
256 }
257
258 /* add dram offset */
259 sp->v.start += dram_start;
260 sp->v.end += dram_start;
261 sp->v.loopstart += dram_start;
262 sp->v.loopend += dram_start;
263
264 snd_emu8000_close_dma(emu);
265 snd_emu8000_init_fm(emu);
266
267 return 0;
268 }
269
270 /*
271 * free a sample block
272 */
273 int
snd_emu8000_sample_free(struct snd_emux * rec,struct snd_sf_sample * sp,struct snd_util_memhdr * hdr)274 snd_emu8000_sample_free(struct snd_emux *rec, struct snd_sf_sample *sp,
275 struct snd_util_memhdr *hdr)
276 {
277 if (sp->block) {
278 snd_util_mem_free(hdr, sp->block);
279 sp->block = NULL;
280 }
281 return 0;
282 }
283
284
285 /*
286 * sample_reset callback - terminate voices
287 */
288 void
snd_emu8000_sample_reset(struct snd_emux * rec)289 snd_emu8000_sample_reset(struct snd_emux *rec)
290 {
291 snd_emux_terminate_all(rec);
292 }
293