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
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
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
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
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
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
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 /* compute true data size to be loaded */
152 truesize = sp->v.size;
153 if (sp->v.mode_flags & (SNDRV_SFNT_SAMPLE_BIDIR_LOOP|SNDRV_SFNT_SAMPLE_REVERSE_LOOP))
154 truesize += sp->v.loopend - sp->v.loopstart;
155 if (sp->v.mode_flags & SNDRV_SFNT_SAMPLE_NO_BLANK)
156 truesize += BLANK_LOOP_SIZE;
157
158 sp->block = snd_util_mem_alloc(hdr, truesize * 2);
159 if (sp->block == NULL) {
160 /*snd_printd("EMU8000: out of memory\n");*/
161 /* not ENOMEM (for compatibility) */
162 return -ENOSPC;
163 }
164
165 if (sp->v.mode_flags & SNDRV_SFNT_SAMPLE_8BITS) {
166 if (!access_ok(data, sp->v.size))
167 return -EFAULT;
168 } else {
169 if (!access_ok(data, sp->v.size * 2))
170 return -EFAULT;
171 }
172
173 /* dram position (in word) -- mem_offset is byte */
174 dram_offset = EMU8000_DRAM_OFFSET + (sp->block->offset >> 1);
175 dram_start = dram_offset;
176
177 /* set the total size (store onto obsolete checksum value) */
178 sp->v.truesize = truesize * 2; /* in bytes */
179
180 snd_emux_terminate_all(emu->emu);
181 rc = snd_emu8000_open_dma(emu, EMU8000_RAM_WRITE);
182 if (rc)
183 return rc;
184
185 /* Set the address to start writing at */
186 snd_emu8000_write_wait(emu);
187 EMU8000_SMALW_WRITE(emu, dram_offset);
188
189 /*snd_emu8000_init_fm(emu);*/
190
191 #if 0
192 /* first block - write 48 samples for silence */
193 if (! sp->block->offset) {
194 for (i = 0; i < BLANK_HEAD_SIZE; i++) {
195 write_word(emu, &dram_offset, 0);
196 }
197 }
198 #endif
199
200 offset = 0;
201 for (i = 0; i < sp->v.size; i++) {
202 unsigned short s;
203
204 s = read_word(data, offset, sp->v.mode_flags);
205 offset++;
206 write_word(emu, &dram_offset, s);
207
208 /* we may take too long time in this loop.
209 * so give controls back to kernel if needed.
210 */
211 cond_resched();
212
213 if (i == sp->v.loopend &&
214 (sp->v.mode_flags & (SNDRV_SFNT_SAMPLE_BIDIR_LOOP|SNDRV_SFNT_SAMPLE_REVERSE_LOOP)))
215 {
216 int looplen = sp->v.loopend - sp->v.loopstart;
217 int k;
218
219 /* copy reverse loop */
220 for (k = 1; k <= looplen; k++) {
221 s = read_word(data, offset - k, sp->v.mode_flags);
222 write_word(emu, &dram_offset, s);
223 }
224 if (sp->v.mode_flags & SNDRV_SFNT_SAMPLE_BIDIR_LOOP) {
225 sp->v.loopend += looplen;
226 } else {
227 sp->v.loopstart += looplen;
228 sp->v.loopend += looplen;
229 }
230 sp->v.end += looplen;
231 }
232 }
233
234 /* if no blank loop is attached in the sample, add it */
235 if (sp->v.mode_flags & SNDRV_SFNT_SAMPLE_NO_BLANK) {
236 for (i = 0; i < BLANK_LOOP_SIZE; i++) {
237 write_word(emu, &dram_offset, 0);
238 }
239 if (sp->v.mode_flags & SNDRV_SFNT_SAMPLE_SINGLESHOT) {
240 sp->v.loopstart = sp->v.end + BLANK_LOOP_START;
241 sp->v.loopend = sp->v.end + BLANK_LOOP_END;
242 }
243 }
244
245 /* add dram offset */
246 sp->v.start += dram_start;
247 sp->v.end += dram_start;
248 sp->v.loopstart += dram_start;
249 sp->v.loopend += dram_start;
250
251 snd_emu8000_close_dma(emu);
252 snd_emu8000_init_fm(emu);
253
254 return 0;
255 }
256
257 /*
258 * free a sample block
259 */
260 int
261 snd_emu8000_sample_free(struct snd_emux *rec, struct snd_sf_sample *sp,
262 struct snd_util_memhdr *hdr)
263 {
264 if (sp->block) {
265 snd_util_mem_free(hdr, sp->block);
266 sp->block = NULL;
267 }
268 return 0;
269 }
270
271
272 /*
273 * sample_reset callback - terminate voices
274 */
275 void
276 snd_emu8000_sample_reset(struct snd_emux *rec)
277 {
278 snd_emux_terminate_all(rec);
279 }
280
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