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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Mac bong noise generator. Note - we ought to put a boingy noise | |
3 | * here 8) | |
4 | * | |
5 | * ---------------------------------------------------------------------- | |
6 | * 16.11.98: | |
7 | * rewrote some functions, added support for Enhanced ASC (Quadras) | |
8 | * after the NetBSD asc.c console bell patch by Colin Wood/Frederick Bruck | |
9 | * Juergen Mellinger (juergen.mellinger@t-online.de) | |
10 | */ | |
11 | ||
12 | #include <linux/sched.h> | |
13 | #include <linux/timer.h> | |
14 | ||
15 | #include <asm/macintosh.h> | |
16 | #include <asm/mac_asc.h> | |
17 | ||
18 | static int mac_asc_inited; | |
19 | /* | |
20 | * dumb triangular wave table | |
21 | */ | |
22 | static __u8 mac_asc_wave_tab[ 0x800 ]; | |
23 | ||
24 | /* | |
25 | * Alan's original sine table; needs interpolating to 0x800 | |
26 | * (hint: interpolate or hardwire [0 -> Pi/2[, it's symmetric) | |
27 | */ | |
28 | static const signed char sine_data[] = { | |
29 | 0, 39, 75, 103, 121, 127, 121, 103, 75, 39, | |
30 | 0, -39, -75, -103, -121, -127, -121, -103, -75, -39 | |
31 | }; | |
32 | ||
33 | /* | |
34 | * where the ASC hides ... | |
35 | */ | |
36 | static volatile __u8* mac_asc_regs = ( void* )0x50F14000; | |
37 | ||
38 | /* | |
39 | * sample rate; is this a good default value? | |
40 | */ | |
41 | static unsigned long mac_asc_samplespersec = 11050; | |
42 | static int mac_bell_duration; | |
43 | static unsigned long mac_bell_phase; /* 0..2*Pi -> 0..0x800 (wavetable size) */ | |
44 | static unsigned long mac_bell_phasepersample; | |
45 | ||
46 | /* | |
47 | * some function protos | |
48 | */ | |
49 | static void mac_init_asc( void ); | |
50 | static void mac_nosound( unsigned long ); | |
51 | static void mac_quadra_start_bell( unsigned int, unsigned int, unsigned int ); | |
52 | static void mac_quadra_ring_bell( unsigned long ); | |
53 | static void mac_av_start_bell( unsigned int, unsigned int, unsigned int ); | |
54 | static void ( *mac_special_bell )( unsigned int, unsigned int, unsigned int ); | |
55 | ||
56 | /* | |
57 | * our timer to start/continue/stop the bell | |
58 | */ | |
8d06afab | 59 | static DEFINE_TIMER(mac_sound_timer, mac_nosound, 0, 0); |
1da177e4 LT |
60 | |
61 | /* | |
62 | * Sort of initialize the sound chip (called from mac_mksound on the first | |
63 | * beep). | |
64 | */ | |
65 | static void mac_init_asc( void ) | |
66 | { | |
67 | int i; | |
68 | ||
69 | /* | |
70 | * do some machine specific initialization | |
71 | * BTW: | |
72 | * the NetBSD Quadra patch identifies the Enhanced Apple Sound Chip via | |
73 | * mac_asc_regs[ 0x800 ] & 0xF0 != 0 | |
74 | * this makes no sense here, because we have to set the default sample | |
75 | * rate anyway if we want correct frequencies | |
76 | */ | |
77 | switch ( macintosh_config->ident ) | |
78 | { | |
79 | case MAC_MODEL_IIFX: | |
80 | /* | |
81 | * The IIfx is always special ... | |
82 | */ | |
83 | mac_asc_regs = ( void* )0x50010000; | |
84 | break; | |
85 | /* | |
86 | * not sure about how correct this list is | |
87 | * machines with the EASC enhanced apple sound chip | |
88 | */ | |
89 | case MAC_MODEL_Q630: | |
90 | case MAC_MODEL_P475: | |
91 | mac_special_bell = mac_quadra_start_bell; | |
92 | mac_asc_samplespersec = 22150; | |
93 | break; | |
94 | case MAC_MODEL_C660: | |
95 | case MAC_MODEL_Q840: | |
96 | /* | |
97 | * The Quadra 660AV and 840AV use the "Singer" custom ASIC for sound I/O. | |
98 | * It appears to be similar to the "AWACS" custom ASIC in the Power Mac | |
99 | * [678]100. Because Singer and AWACS may have a similar hardware | |
100 | * interface, this would imply that the code in drivers/sound/dmasound.c | |
101 | * for AWACS could be used as a basis for Singer support. All we have to | |
102 | * do is figure out how to do DMA on the 660AV/840AV through the PSC and | |
103 | * figure out where the Singer hardware sits in memory. (I'd look in the | |
104 | * vicinity of the AWACS location in a Power Mac [678]100 first, or the | |
105 | * current location of the Apple Sound Chip--ASC--in other Macs.) The | |
106 | * Power Mac [678]100 info can be found in MkLinux Mach kernel sources. | |
107 | * | |
108 | * Quoted from Apple's Tech Info Library, article number 16405: | |
109 | * "Among desktop Macintosh computers, only the 660AV, 840AV, and Power | |
110 | * Macintosh models have 16-bit audio input and output capability | |
111 | * because of the AT&T DSP3210 hardware circuitry and the 16-bit Singer | |
112 | * codec circuitry in the AVs. The Audio Waveform Amplifier and | |
113 | * Converter (AWAC) chip in the Power Macintosh performs the same | |
114 | * 16-bit I/O functionality. The PowerBook 500 series computers | |
115 | * support 16-bit stereo output, but only mono input." | |
116 | * | |
117 | * http://til.info.apple.com/techinfo.nsf/artnum/n16405 | |
118 | * | |
119 | * --David Kilzer | |
120 | */ | |
121 | mac_special_bell = mac_av_start_bell; | |
122 | break; | |
123 | case MAC_MODEL_Q650: | |
124 | case MAC_MODEL_Q700: | |
125 | case MAC_MODEL_Q800: | |
126 | case MAC_MODEL_Q900: | |
127 | case MAC_MODEL_Q950: | |
128 | /* | |
129 | * Currently not implemented! | |
130 | */ | |
131 | mac_special_bell = NULL; | |
132 | break; | |
133 | default: | |
134 | /* | |
135 | * Every switch needs a default | |
136 | */ | |
137 | mac_special_bell = NULL; | |
138 | break; | |
139 | } | |
140 | ||
141 | /* | |
142 | * init the wave table with a simple triangular wave | |
143 | * A sine wave would sure be nicer here ... | |
144 | */ | |
145 | for ( i = 0; i < 0x400; i++ ) | |
146 | { | |
147 | mac_asc_wave_tab[ i ] = i / 4; | |
148 | mac_asc_wave_tab[ i + 0x400 ] = 0xFF - i / 4; | |
149 | } | |
150 | mac_asc_inited = 1; | |
151 | } | |
152 | ||
153 | /* | |
154 | * Called to make noise; current single entry to the boing driver. | |
155 | * Does the job for simple ASC, calls other routines else. | |
156 | * XXX Fixme: | |
157 | * Should be split into asc_mksound, easc_mksound, av_mksound and | |
158 | * function pointer set in mac_init_asc which would be called at | |
159 | * init time. | |
160 | * _This_ is rather ugly ... | |
161 | */ | |
162 | void mac_mksound( unsigned int freq, unsigned int length ) | |
163 | { | |
164 | __u32 cfreq = ( freq << 5 ) / 468; | |
165 | __u32 flags; | |
166 | int i; | |
167 | ||
168 | if ( mac_special_bell == NULL ) | |
169 | { | |
170 | /* Do nothing */ | |
171 | return; | |
172 | } | |
173 | ||
174 | if ( !mac_asc_inited ) | |
175 | mac_init_asc(); | |
176 | ||
177 | if ( mac_special_bell ) | |
178 | { | |
179 | mac_special_bell( freq, length, 128 ); | |
180 | return; | |
181 | } | |
182 | ||
183 | if ( freq < 20 || freq > 20000 || length == 0 ) | |
184 | { | |
185 | mac_nosound( 0 ); | |
186 | return; | |
187 | } | |
188 | ||
189 | local_irq_save(flags); | |
190 | ||
191 | del_timer( &mac_sound_timer ); | |
192 | ||
193 | for ( i = 0; i < 0x800; i++ ) | |
194 | mac_asc_regs[ i ] = 0; | |
195 | for ( i = 0; i < 0x800; i++ ) | |
196 | mac_asc_regs[ i ] = mac_asc_wave_tab[ i ]; | |
197 | ||
198 | for ( i = 0; i < 8; i++ ) | |
199 | *( __u32* )( ( __u32 )mac_asc_regs + ASC_CONTROL + 0x814 + 8 * i ) = cfreq; | |
200 | ||
201 | mac_asc_regs[ 0x807 ] = 0; | |
202 | mac_asc_regs[ ASC_VOLUME ] = 128; | |
203 | mac_asc_regs[ 0x805 ] = 0; | |
204 | mac_asc_regs[ 0x80F ] = 0; | |
205 | mac_asc_regs[ ASC_MODE ] = ASC_MODE_SAMPLE; | |
206 | mac_asc_regs[ ASC_ENABLE ] = ASC_ENABLE_SAMPLE; | |
207 | ||
208 | mac_sound_timer.expires = jiffies + length; | |
209 | add_timer( &mac_sound_timer ); | |
210 | ||
211 | local_irq_restore(flags); | |
212 | } | |
213 | ||
214 | /* | |
215 | * regular ASC: stop whining .. | |
216 | */ | |
217 | static void mac_nosound( unsigned long ignored ) | |
218 | { | |
219 | mac_asc_regs[ ASC_ENABLE ] = 0; | |
220 | } | |
221 | ||
222 | /* | |
223 | * EASC entry; init EASC, don't load wavetable, schedule 'start whining'. | |
224 | */ | |
225 | static void mac_quadra_start_bell( unsigned int freq, unsigned int length, unsigned int volume ) | |
226 | { | |
227 | __u32 flags; | |
228 | ||
229 | /* if the bell is already ringing, ring longer */ | |
230 | if ( mac_bell_duration > 0 ) | |
231 | { | |
232 | mac_bell_duration += length; | |
233 | return; | |
234 | } | |
235 | ||
236 | mac_bell_duration = length; | |
237 | mac_bell_phase = 0; | |
238 | mac_bell_phasepersample = ( freq * sizeof( mac_asc_wave_tab ) ) / mac_asc_samplespersec; | |
239 | /* this is reasonably big for small frequencies */ | |
240 | ||
241 | local_irq_save(flags); | |
242 | ||
243 | /* set the volume */ | |
244 | mac_asc_regs[ 0x806 ] = volume; | |
245 | ||
246 | /* set up the ASC registers */ | |
247 | if ( mac_asc_regs[ 0x801 ] != 1 ) | |
248 | { | |
249 | /* select mono mode */ | |
250 | mac_asc_regs[ 0x807 ] = 0; | |
251 | /* select sampled sound mode */ | |
252 | mac_asc_regs[ 0x802 ] = 0; | |
253 | /* ??? */ | |
254 | mac_asc_regs[ 0x801 ] = 1; | |
255 | mac_asc_regs[ 0x803 ] |= 0x80; | |
256 | mac_asc_regs[ 0x803 ] &= 0x7F; | |
257 | } | |
258 | ||
259 | mac_sound_timer.function = mac_quadra_ring_bell; | |
260 | mac_sound_timer.expires = jiffies + 1; | |
261 | add_timer( &mac_sound_timer ); | |
262 | ||
263 | local_irq_restore(flags); | |
264 | } | |
265 | ||
266 | /* | |
267 | * EASC 'start/continue whining'; I'm not sure why the above function didn't | |
268 | * already load the wave table, or at least call this one... | |
269 | * This piece keeps reloading the wave table until done. | |
270 | */ | |
271 | static void mac_quadra_ring_bell( unsigned long ignored ) | |
272 | { | |
273 | int i, count = mac_asc_samplespersec / HZ; | |
274 | __u32 flags; | |
275 | ||
276 | /* | |
277 | * we neither want a sound buffer overflow nor underflow, so we need to match | |
278 | * the number of samples per timer interrupt as exactly as possible. | |
279 | * using the asc interrupt will give better results in the future | |
280 | * ...and the possibility to use a real sample (a boingy noise, maybe...) | |
281 | */ | |
282 | ||
283 | local_irq_save(flags); | |
284 | ||
285 | del_timer( &mac_sound_timer ); | |
286 | ||
287 | if ( mac_bell_duration-- > 0 ) | |
288 | { | |
289 | for ( i = 0; i < count; i++ ) | |
290 | { | |
291 | mac_bell_phase += mac_bell_phasepersample; | |
292 | mac_asc_regs[ 0 ] = mac_asc_wave_tab[ mac_bell_phase & ( sizeof( mac_asc_wave_tab ) - 1 ) ]; | |
293 | } | |
294 | mac_sound_timer.expires = jiffies + 1; | |
295 | add_timer( &mac_sound_timer ); | |
296 | } | |
297 | else | |
298 | mac_asc_regs[ 0x801 ] = 0; | |
299 | ||
300 | local_irq_restore(flags); | |
301 | } | |
302 | ||
303 | /* | |
304 | * AV code - please fill in. | |
305 | */ | |
306 | static void mac_av_start_bell( unsigned int freq, unsigned int length, unsigned int volume ) | |
307 | { | |
308 | } |