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Commit | Line | Data |
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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 | */ | |
59 | static DEFINE_TIMER(mac_sound_timer, mac_nosound, 0, 0); | |
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 | * Technical Information Library (TIL) article number 16405. | |
118 | * http://support.apple.com/kb/TA32601 | |
119 | * | |
120 | * --David Kilzer | |
121 | */ | |
122 | mac_special_bell = mac_av_start_bell; | |
123 | break; | |
124 | case MAC_MODEL_Q650: | |
125 | case MAC_MODEL_Q700: | |
126 | case MAC_MODEL_Q800: | |
127 | case MAC_MODEL_Q900: | |
128 | case MAC_MODEL_Q950: | |
129 | /* | |
130 | * Currently not implemented! | |
131 | */ | |
132 | mac_special_bell = NULL; | |
133 | break; | |
134 | default: | |
135 | /* | |
136 | * Every switch needs a default | |
137 | */ | |
138 | mac_special_bell = NULL; | |
139 | break; | |
140 | } | |
141 | ||
142 | /* | |
143 | * init the wave table with a simple triangular wave | |
144 | * A sine wave would sure be nicer here ... | |
145 | */ | |
146 | for ( i = 0; i < 0x400; i++ ) | |
147 | { | |
148 | mac_asc_wave_tab[ i ] = i / 4; | |
149 | mac_asc_wave_tab[ i + 0x400 ] = 0xFF - i / 4; | |
150 | } | |
151 | mac_asc_inited = 1; | |
152 | } | |
153 | ||
154 | /* | |
155 | * Called to make noise; current single entry to the boing driver. | |
156 | * Does the job for simple ASC, calls other routines else. | |
157 | * XXX Fixme: | |
158 | * Should be split into asc_mksound, easc_mksound, av_mksound and | |
159 | * function pointer set in mac_init_asc which would be called at | |
160 | * init time. | |
161 | * _This_ is rather ugly ... | |
162 | */ | |
163 | void mac_mksound( unsigned int freq, unsigned int length ) | |
164 | { | |
165 | __u32 cfreq = ( freq << 5 ) / 468; | |
166 | unsigned long flags; | |
167 | int i; | |
168 | ||
169 | if ( mac_special_bell == NULL ) | |
170 | { | |
171 | /* Do nothing */ | |
172 | return; | |
173 | } | |
174 | ||
175 | if ( !mac_asc_inited ) | |
176 | mac_init_asc(); | |
177 | ||
178 | if ( mac_special_bell ) | |
179 | { | |
180 | mac_special_bell( freq, length, 128 ); | |
181 | return; | |
182 | } | |
183 | ||
184 | if ( freq < 20 || freq > 20000 || length == 0 ) | |
185 | { | |
186 | mac_nosound( 0 ); | |
187 | return; | |
188 | } | |
189 | ||
190 | local_irq_save(flags); | |
191 | ||
192 | del_timer( &mac_sound_timer ); | |
193 | ||
194 | for ( i = 0; i < 0x800; i++ ) | |
195 | mac_asc_regs[ i ] = 0; | |
196 | for ( i = 0; i < 0x800; i++ ) | |
197 | mac_asc_regs[ i ] = mac_asc_wave_tab[ i ]; | |
198 | ||
199 | for ( i = 0; i < 8; i++ ) | |
200 | *( __u32* )( ( __u32 )mac_asc_regs + ASC_CONTROL + 0x814 + 8 * i ) = cfreq; | |
201 | ||
202 | mac_asc_regs[ 0x807 ] = 0; | |
203 | mac_asc_regs[ ASC_VOLUME ] = 128; | |
204 | mac_asc_regs[ 0x805 ] = 0; | |
205 | mac_asc_regs[ 0x80F ] = 0; | |
206 | mac_asc_regs[ ASC_MODE ] = ASC_MODE_SAMPLE; | |
207 | mac_asc_regs[ ASC_ENABLE ] = ASC_ENABLE_SAMPLE; | |
208 | ||
209 | mac_sound_timer.expires = jiffies + length; | |
210 | add_timer( &mac_sound_timer ); | |
211 | ||
212 | local_irq_restore(flags); | |
213 | } | |
214 | ||
215 | /* | |
216 | * regular ASC: stop whining .. | |
217 | */ | |
218 | static void mac_nosound( unsigned long ignored ) | |
219 | { | |
220 | mac_asc_regs[ ASC_ENABLE ] = 0; | |
221 | } | |
222 | ||
223 | /* | |
224 | * EASC entry; init EASC, don't load wavetable, schedule 'start whining'. | |
225 | */ | |
226 | static void mac_quadra_start_bell( unsigned int freq, unsigned int length, unsigned int volume ) | |
227 | { | |
228 | unsigned long flags; | |
229 | ||
230 | /* if the bell is already ringing, ring longer */ | |
231 | if ( mac_bell_duration > 0 ) | |
232 | { | |
233 | mac_bell_duration += length; | |
234 | return; | |
235 | } | |
236 | ||
237 | mac_bell_duration = length; | |
238 | mac_bell_phase = 0; | |
239 | mac_bell_phasepersample = ( freq * sizeof( mac_asc_wave_tab ) ) / mac_asc_samplespersec; | |
240 | /* this is reasonably big for small frequencies */ | |
241 | ||
242 | local_irq_save(flags); | |
243 | ||
244 | /* set the volume */ | |
245 | mac_asc_regs[ 0x806 ] = volume; | |
246 | ||
247 | /* set up the ASC registers */ | |
248 | if ( mac_asc_regs[ 0x801 ] != 1 ) | |
249 | { | |
250 | /* select mono mode */ | |
251 | mac_asc_regs[ 0x807 ] = 0; | |
252 | /* select sampled sound mode */ | |
253 | mac_asc_regs[ 0x802 ] = 0; | |
254 | /* ??? */ | |
255 | mac_asc_regs[ 0x801 ] = 1; | |
256 | mac_asc_regs[ 0x803 ] |= 0x80; | |
257 | mac_asc_regs[ 0x803 ] &= 0x7F; | |
258 | } | |
259 | ||
260 | mac_sound_timer.function = mac_quadra_ring_bell; | |
261 | mac_sound_timer.expires = jiffies + 1; | |
262 | add_timer( &mac_sound_timer ); | |
263 | ||
264 | local_irq_restore(flags); | |
265 | } | |
266 | ||
267 | /* | |
268 | * EASC 'start/continue whining'; I'm not sure why the above function didn't | |
269 | * already load the wave table, or at least call this one... | |
270 | * This piece keeps reloading the wave table until done. | |
271 | */ | |
272 | static void mac_quadra_ring_bell( unsigned long ignored ) | |
273 | { | |
274 | int i, count = mac_asc_samplespersec / HZ; | |
275 | unsigned long flags; | |
276 | ||
277 | /* | |
278 | * we neither want a sound buffer overflow nor underflow, so we need to match | |
279 | * the number of samples per timer interrupt as exactly as possible. | |
280 | * using the asc interrupt will give better results in the future | |
281 | * ...and the possibility to use a real sample (a boingy noise, maybe...) | |
282 | */ | |
283 | ||
284 | local_irq_save(flags); | |
285 | ||
286 | del_timer( &mac_sound_timer ); | |
287 | ||
288 | if ( mac_bell_duration-- > 0 ) | |
289 | { | |
290 | for ( i = 0; i < count; i++ ) | |
291 | { | |
292 | mac_bell_phase += mac_bell_phasepersample; | |
293 | mac_asc_regs[ 0 ] = mac_asc_wave_tab[ mac_bell_phase & ( sizeof( mac_asc_wave_tab ) - 1 ) ]; | |
294 | } | |
295 | mac_sound_timer.expires = jiffies + 1; | |
296 | add_timer( &mac_sound_timer ); | |
297 | } | |
298 | else | |
299 | mac_asc_regs[ 0x801 ] = 0; | |
300 | ||
301 | local_irq_restore(flags); | |
302 | } | |
303 | ||
304 | /* | |
305 | * AV code - please fill in. | |
306 | */ | |
307 | static void mac_av_start_bell( unsigned int freq, unsigned int length, unsigned int volume ) | |
308 | { | |
309 | } |