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