| 1 | /* This file is part of the Dreamcast function library. |
| 2 | * Please see libdream.c for further details. |
| 3 | * |
| 4 | * (c)2000 Dan Potter |
| 5 | * modify BERO |
| 6 | */ |
| 7 | #include "aica.h" |
| 8 | |
| 9 | #include <arch/irq.h> |
| 10 | #include <dc/spu.h> |
| 11 | |
| 12 | /* #define dc_snd_base ((volatile unsigned char *)0x00800000) */ /* arm side */ |
| 13 | #define dc_snd_base ((volatile unsigned char *)0xa0700000) /* dc side */ |
| 14 | |
| 15 | /* Some convienence macros */ |
| 16 | #define SNDREGADDR(x) (0xa0700000 + (x)) |
| 17 | #define CHNREGADDR(ch,x) SNDREGADDR(0x80*(ch)+(x)) |
| 18 | |
| 19 | |
| 20 | #define SNDREG32(x) (*(volatile unsigned long *)SNDREGADDR(x)) |
| 21 | #define SNDREG8(x) (*(volatile unsigned char *)SNDREGADDR(x)) |
| 22 | #define CHNREG32(ch, x) (*(volatile unsigned long *)CHNREGADDR(ch,x)) |
| 23 | #define CHNREG8(ch, x) (*(volatile unsigned long *)CHNREGADDR(ch,x)) |
| 24 | |
| 25 | #define G2_LOCK(OLD) \ |
| 26 | do { \ |
| 27 | if (!irq_inside_int()) \ |
| 28 | OLD = irq_disable(); \ |
| 29 | /* suspend any G2 DMA here... */ \ |
| 30 | while((*(volatile unsigned int *)0xa05f688c) & 0x20) \ |
| 31 | ; \ |
| 32 | } while(0) |
| 33 | |
| 34 | #define G2_UNLOCK(OLD) \ |
| 35 | do { \ |
| 36 | /* resume any G2 DMA here... */ \ |
| 37 | if (!irq_inside_int()) \ |
| 38 | irq_restore(OLD); \ |
| 39 | } while(0) |
| 40 | |
| 41 | |
| 42 | void aica_init() { |
| 43 | int i, j, old = 0; |
| 44 | |
| 45 | /* Initialize AICA channels */ |
| 46 | G2_LOCK(old); |
| 47 | SNDREG32(0x2800) = 0x0000; |
| 48 | |
| 49 | for (i=0; i<64; i++) { |
| 50 | for (j=0; j<0x80; j+=4) { |
| 51 | if ((j&31)==0) g2_fifo_wait(); |
| 52 | CHNREG32(i, j) = 0; |
| 53 | } |
| 54 | g2_fifo_wait(); |
| 55 | CHNREG32(i,0) = 0x8000; |
| 56 | CHNREG32(i,20) = 0x1f; |
| 57 | } |
| 58 | |
| 59 | SNDREG32(0x2800) = 0x000f; |
| 60 | g2_fifo_wait(); |
| 61 | G2_UNLOCK(old); |
| 62 | } |
| 63 | |
| 64 | /* Translates a volume from linear form to logarithmic form (required by |
| 65 | the AICA chip */ |
| 66 | /* int logs[] = { |
| 67 | |
| 68 | 0, 40, 50, 58, 63, 68, 73, 77, 80, 83, 86, 89, 92, 94, 97, 99, 101, 103, |
| 69 | 105, 107, 109, 111, 112, 114, 116, 117, 119, 120, 122, 123, 125, 126, 127, |
| 70 | 129, 130, 131, 133, 134, 135, 136, 137, 139, 140, 141, 142, 143, 144, 145, |
| 71 | 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 156, 157, 158, 159, |
| 72 | 160, 161, 162, 162, 163, 164, 165, 166, 166, 167, 168, 169, 170, 170, 171, |
| 73 | 172, 172, 173, 174, 175, 175, 176, 177, 177, 178, 179, 180, 180, 181, 182, |
| 74 | 182, 183, 183, 184, 185, 185, 186, 187, 187, 188, 188, 189, 190, 190, 191, |
| 75 | 191, 192, 193, 193, 194, 194, 195, 196, 196, 197, 197, 198, 198, 199, 199, |
| 76 | 200, 201, 201, 202, 202, 203, 203, 204, 204, 205, 205, 206, 206, 207, 207, |
| 77 | 208, 208, 209, 209, 210, 210, 211, 211, 212, 212, 213, 213, 214, 214, 215, |
| 78 | 215, 216, 216, 217, 217, 217, 218, 218, 219, 219, 220, 220, 221, 221, 222, |
| 79 | 222, 222, 223, 223, 224, 224, 225, 225, 225, 226, 226, 227, 227, 228, 228, |
| 80 | 228, 229, 229, 230, 230, 230, 231, 231, 232, 232, 232, 233, 233, 234, 234, |
| 81 | 234, 235, 235, 236, 236, 236, 237, 237, 238, 238, 238, 239, 239, 240, 240, |
| 82 | 240, 241, 241, 241, 242, 242, 243, 243, 243, 244, 244, 244, 245, 245, 245, |
| 83 | 246, 246, 247, 247, 247, 248, 248, 248, 249, 249, 249, 250, 250, 250, 251, |
| 84 | 251, 251, 252, 252, 252, 253, 253, 253, 254, 254, 254, 255 |
| 85 | |
| 86 | }; */ |
| 87 | |
| 88 | const static unsigned char logs[] = { |
| 89 | 0, 15, 22, 27, 31, 35, 39, 42, 45, 47, 50, 52, 55, 57, 59, 61, |
| 90 | 63, 65, 67, 69, 71, 73, 74, 76, 78, 79, 81, 82, 84, 85, 87, 88, |
| 91 | 90, 91, 92, 94, 95, 96, 98, 99, 100, 102, 103, 104, 105, 106, |
| 92 | 108, 109, 110, 111, 112, 113, 114, 116, 117, 118, 119, 120, 121, |
| 93 | 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, |
| 94 | 135, 136, 137, 138, 138, 139, 140, 141, 142, 143, 144, 145, 146, |
| 95 | 146, 147, 148, 149, 150, 151, 152, 152, 153, 154, 155, 156, 156, |
| 96 | 157, 158, 159, 160, 160, 161, 162, 163, 164, 164, 165, 166, 167, |
| 97 | 167, 168, 169, 170, 170, 171, 172, 173, 173, 174, 175, 176, 176, |
| 98 | 177, 178, 178, 179, 180, 181, 181, 182, 183, 183, 184, 185, 185, |
| 99 | 186, 187, 187, 188, 189, 189, 190, 191, 191, 192, 193, 193, 194, |
| 100 | 195, 195, 196, 197, 197, 198, 199, 199, 200, 200, 201, 202, 202, |
| 101 | 203, 204, 204, 205, 205, 206, 207, 207, 208, 209, 209, 210, 210, |
| 102 | 211, 212, 212, 213, 213, 214, 215, 215, 216, 216, 217, 217, 218, |
| 103 | 219, 219, 220, 220, 221, 221, 222, 223, 223, 224, 224, 225, 225, |
| 104 | 226, 227, 227, 228, 228, 229, 229, 230, 230, 231, 232, 232, 233, |
| 105 | 233, 234, 234, 235, 235, 236, 236, 237, 237, 238, 239, 239, 240, |
| 106 | 240, 241, 241, 242, 242, 243, 243, 244, 244, 245, 245, 246, 246, |
| 107 | 247, 247, 248, 248, 249, 249, 250, 250, 251, 251, 252, 252, 253, 254, 255 |
| 108 | }; |
| 109 | |
| 110 | /* For the moment this is going to have to suffice, until we really |
| 111 | figure out what these mean. */ |
| 112 | #define AICA_PAN(x) ((x)==0x80?(0):((x)<0x80?(0x1f):(0x0f))) |
| 113 | #define AICA_VOL(x) (0xff - logs[128 + (((x) & 0xff) / 2)]) |
| 114 | //#define AICA_VOL(x) (0xff - logs[x&255]) |
| 115 | |
| 116 | static inline unsigned AICA_FREQ(unsigned freq) { |
| 117 | unsigned long freq_lo, freq_base = 5644800; |
| 118 | int freq_hi = 7; |
| 119 | |
| 120 | /* Need to convert frequency to floating point format |
| 121 | (freq_hi is exponent, freq_lo is mantissa) |
| 122 | Formula is ferq = 44100*2^freq_hi*(1+freq_lo/1024) */ |
| 123 | while (freq < freq_base && freq_hi > -8) { |
| 124 | freq_base >>= 1; |
| 125 | --freq_hi; |
| 126 | } |
| 127 | while (freq < freq_base && freq_hi > -8) { |
| 128 | freq_base >>= 1; |
| 129 | freq_hi--; |
| 130 | } |
| 131 | freq_lo = (freq<<10) / freq_base; |
| 132 | return (freq_hi << 11) | (freq_lo & 1023); |
| 133 | } |
| 134 | |
| 135 | /* Sets up a sound channel completely. This is generally good if you want |
| 136 | a quick and dirty way to play notes. If you want a more comprehensive |
| 137 | set of routines (more like PC wavetable cards) see below. |
| 138 | |
| 139 | ch is the channel to play on (0 - 63) |
| 140 | smpptr is the pointer to the sound data; if you're running off the |
| 141 | SH4, then this ought to be (ptr - 0xa0800000); otherwise it's just |
| 142 | ptr. Basically, it's an offset into sound ram. |
| 143 | mode is one of the mode constants (16 bit, 8 bit, ADPCM) |
| 144 | nsamp is the number of samples to play (not number of bytes!) |
| 145 | freq is the sampling rate of the sound |
| 146 | vol is the volume, 0 to 0xff (0xff is louder) |
| 147 | pan is a panning constant -- 0 is left, 128 is center, 255 is right. |
| 148 | |
| 149 | This routine (and the similar ones) owe a lot to Marcus' sound example -- |
| 150 | I hadn't gotten quite this far into dissecting the individual regs yet. */ |
| 151 | void aica_play(int ch,int mode,unsigned long smpptr,int loopst,int loopend,int freq,int vol,int pan,int loopflag) { |
| 152 | /* int i; |
| 153 | */ |
| 154 | int val; |
| 155 | int old = 0; |
| 156 | |
| 157 | /* Stop the channel (if it's already playing) */ |
| 158 | aica_stop(ch); |
| 159 | /* doesn't seem to be needed, but it's here just in case */ |
| 160 | /* |
| 161 | for (i=0; i<256; i++) { |
| 162 | asm("nop"); |
| 163 | asm("nop"); |
| 164 | asm("nop"); |
| 165 | asm("nop"); |
| 166 | } |
| 167 | */ |
| 168 | G2_LOCK(old); |
| 169 | /* Envelope setup. The first of these is the loop point, |
| 170 | e.g., where the sample starts over when it loops. The second |
| 171 | is the loop end. This is the full length of the sample when |
| 172 | you are not looping, or the loop end point when you are (though |
| 173 | storing more than that is a waste of memory if you're not doing |
| 174 | volume enveloping). */ |
| 175 | CHNREG32(ch, 8) = loopst & 0xffff; |
| 176 | CHNREG32(ch, 12) = loopend & 0xffff; |
| 177 | |
| 178 | /* Write resulting values */ |
| 179 | CHNREG32(ch, 24) = AICA_FREQ(freq); |
| 180 | |
| 181 | /* Set volume, pan, and some other things that we don't know what |
| 182 | they do =) */ |
| 183 | CHNREG32(ch, 36) = AICA_PAN(pan) | (0xf<<8); |
| 184 | /* Convert the incoming volume and pan into hardware values */ |
| 185 | /* Vol starts at zero so we can ramp */ |
| 186 | vol = AICA_VOL(vol); |
| 187 | CHNREG32(ch, 40) = 0x24 | (vol<<8); |
| 188 | /* Convert the incoming volume and pan into hardware values */ |
| 189 | /* Vol starts at zero so we can ramp */ |
| 190 | |
| 191 | /* If we supported volume envelopes (which we don't yet) then |
| 192 | this value would set that up. The top 4 bits determine the |
| 193 | envelope speed. f is the fastest, 1 is the slowest, and 0 |
| 194 | seems to be an invalid value and does weird things). The |
| 195 | default (below) sets it into normal mode (play and terminate/loop). |
| 196 | CHNREG32(ch, 16) = 0xf010; |
| 197 | */ |
| 198 | CHNREG32(ch, 16) = 0x1f; /* No volume envelope */ |
| 199 | |
| 200 | |
| 201 | /* Set sample format, buffer address, and looping control. If |
| 202 | 0x0200 mask is set on reg 0, the sample loops infinitely. If |
| 203 | it's not set, the sample plays once and terminates. We'll |
| 204 | also set the bits to start playback here. */ |
| 205 | CHNREG32(ch, 4) = smpptr & 0xffff; |
| 206 | val = 0xc000 | 0x0000 | (mode<<7) | (smpptr >> 16); |
| 207 | if (loopflag) val|=0x200; |
| 208 | |
| 209 | CHNREG32(ch, 0) = val; |
| 210 | |
| 211 | G2_UNLOCK(old); |
| 212 | |
| 213 | /* Enable playback */ |
| 214 | /* CHNREG32(ch, 0) |= 0xc000; */ |
| 215 | g2_fifo_wait(); |
| 216 | |
| 217 | #if 0 |
| 218 | for (i=0xff; i>=vol; i--) { |
| 219 | if ((i&7)==0) g2_fifo_wait(); |
| 220 | CHNREG32(ch, 40) = 0x24 | (i<<8);; |
| 221 | } |
| 222 | |
| 223 | g2_fifo_wait(); |
| 224 | #endif |
| 225 | } |
| 226 | |
| 227 | /* Stop the sound on a given channel */ |
| 228 | void aica_stop(int ch) { |
| 229 | g2_write_32(CHNREGADDR(ch, 0),(g2_read_32(CHNREGADDR(ch, 0)) & ~0x4000) | 0x8000); |
| 230 | g2_fifo_wait(); |
| 231 | } |
| 232 | |
| 233 | |
| 234 | /* The rest of these routines can change the channel in mid-stride so you |
| 235 | can do things like vibrato and panning effects. */ |
| 236 | |
| 237 | /* Set channel volume */ |
| 238 | void aica_vol(int ch,int vol) { |
| 239 | // g2_write_8(CHNREGADDR(ch, 41),AICA_VOL(vol)); |
| 240 | g2_write_32(CHNREGADDR(ch, 40),(g2_read_32(CHNREGADDR(ch, 40))&0xffff00ff)|(AICA_VOL(vol)<<8) ); |
| 241 | g2_fifo_wait(); |
| 242 | } |
| 243 | |
| 244 | /* Set channel pan */ |
| 245 | void aica_pan(int ch,int pan) { |
| 246 | // g2_write_8(CHNREGADDR(ch, 36),AICA_PAN(pan)); |
| 247 | g2_write_32(CHNREGADDR(ch, 36),(g2_read_32(CHNREGADDR(ch, 36))&0xffffff00)|(AICA_PAN(pan)) ); |
| 248 | g2_fifo_wait(); |
| 249 | } |
| 250 | |
| 251 | /* Set channel frequency */ |
| 252 | void aica_freq(int ch,int freq) { |
| 253 | g2_write_32(CHNREGADDR(ch, 24),AICA_FREQ(freq)); |
| 254 | g2_fifo_wait(); |
| 255 | } |
| 256 | |
| 257 | /* Get channel position */ |
| 258 | int aica_get_pos(int ch) { |
| 259 | #if 1 |
| 260 | /* Observe channel ch */ |
| 261 | g2_write_32(SNDREGADDR(0x280c),(g2_read_32(SNDREGADDR(0x280c))&0xffff00ff) | (ch<<8)); |
| 262 | g2_fifo_wait(); |
| 263 | /* Update position counters */ |
| 264 | return g2_read_32(SNDREGADDR(0x2814)) & 0xffff; |
| 265 | #else |
| 266 | /* Observe channel ch */ |
| 267 | g2_write_8(SNDREGADDR(0x280d),ch); |
| 268 | /* Update position counters */ |
| 269 | return g2_read_32(SNDREGADDR(0x2814)) & 0xffff; |
| 270 | #endif |
| 271 | } |