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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
18static int mac_asc_inited;
19/*
20 * dumb triangular wave table
21 */
22static __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 */
28static 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 */
36static volatile __u8* mac_asc_regs = ( void* )0x50F14000;
37
38/*
39 * sample rate; is this a good default value?
40 */
41static unsigned long mac_asc_samplespersec = 11050;
42static int mac_bell_duration;
43static unsigned long mac_bell_phase; /* 0..2*Pi -> 0..0x800 (wavetable size) */
44static unsigned long mac_bell_phasepersample;
45
46/*
47 * some function protos
48 */
49static void mac_init_asc( void );
50static void mac_nosound( unsigned long );
51static void mac_quadra_start_bell( unsigned int, unsigned int, unsigned int );
52static void mac_quadra_ring_bell( unsigned long );
53static void mac_av_start_bell( unsigned int, unsigned int, unsigned int );
54static void ( *mac_special_bell )( unsigned int, unsigned int, unsigned int );
55
56/*
57 * our timer to start/continue/stop the bell
58 */
59static struct timer_list mac_sound_timer =
60 TIMER_INITIALIZER(mac_nosound, 0, 0);
61
62/*
63 * Sort of initialize the sound chip (called from mac_mksound on the first
64 * beep).
65 */
66static void mac_init_asc( void )
67{
68 int i;
69
70 /*
71 * do some machine specific initialization
72 * BTW:
73 * the NetBSD Quadra patch identifies the Enhanced Apple Sound Chip via
74 * mac_asc_regs[ 0x800 ] & 0xF0 != 0
75 * this makes no sense here, because we have to set the default sample
76 * rate anyway if we want correct frequencies
77 */
78 switch ( macintosh_config->ident )
79 {
80 case MAC_MODEL_IIFX:
81 /*
82 * The IIfx is always special ...
83 */
84 mac_asc_regs = ( void* )0x50010000;
85 break;
86 /*
87 * not sure about how correct this list is
88 * machines with the EASC enhanced apple sound chip
89 */
90 case MAC_MODEL_Q630:
91 case MAC_MODEL_P475:
92 mac_special_bell = mac_quadra_start_bell;
93 mac_asc_samplespersec = 22150;
94 break;
95 case MAC_MODEL_C660:
96 case MAC_MODEL_Q840:
97 /*
98 * The Quadra 660AV and 840AV use the "Singer" custom ASIC for sound I/O.
99 * It appears to be similar to the "AWACS" custom ASIC in the Power Mac
100 * [678]100. Because Singer and AWACS may have a similar hardware
101 * interface, this would imply that the code in drivers/sound/dmasound.c
102 * for AWACS could be used as a basis for Singer support. All we have to
103 * do is figure out how to do DMA on the 660AV/840AV through the PSC and
104 * figure out where the Singer hardware sits in memory. (I'd look in the
105 * vicinity of the AWACS location in a Power Mac [678]100 first, or the
106 * current location of the Apple Sound Chip--ASC--in other Macs.) The
107 * Power Mac [678]100 info can be found in MkLinux Mach kernel sources.
108 *
109 * Quoted from Apple's Tech Info Library, article number 16405:
110 * "Among desktop Macintosh computers, only the 660AV, 840AV, and Power
111 * Macintosh models have 16-bit audio input and output capability
112 * because of the AT&T DSP3210 hardware circuitry and the 16-bit Singer
113 * codec circuitry in the AVs. The Audio Waveform Amplifier and
114 * Converter (AWAC) chip in the Power Macintosh performs the same
115 * 16-bit I/O functionality. The PowerBook 500 series computers
116 * support 16-bit stereo output, but only mono input."
117 *
118 * http://til.info.apple.com/techinfo.nsf/artnum/n16405
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 */
163void mac_mksound( unsigned int freq, unsigned int length )
164{
165 __u32 cfreq = ( freq << 5 ) / 468;
166 __u32 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 */
218static 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 */
226static void mac_quadra_start_bell( unsigned int freq, unsigned int length, unsigned int volume )
227{
228 __u32 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 */
272static void mac_quadra_ring_bell( unsigned long ignored )
273{
274 int i, count = mac_asc_samplespersec / HZ;
275 __u32 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 */
307static void mac_av_start_bell( unsigned int freq, unsigned int length, unsigned int volume )
308{
309}
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