1 // SPDX-License-Identifier: GPL-2.0 1
2 /*
3 * Mac bong noise generator. Note - we ou
4 * here 8)
5 *
6 * --------------------------------------
7 * 16.11.98:
8 * rewrote some functions, added support
9 * after the NetBSD asc.c console bell pa
10 * Juergen Mellinger (juergen.mellinger@t
11 */
12
13 #include <linux/sched.h>
14 #include <linux/timer.h>
15
16 #include <asm/macintosh.h>
17 #include <asm/mac_asc.h>
18
19 #include "mac.h"
20
21 static int mac_asc_inited;
22 /*
23 * dumb triangular wave table
24 */
25 static __u8 mac_asc_wave_tab[ 0x800 ];
26
27 /*
28 * where the ASC hides ...
29 */
30 static volatile __u8* mac_asc_regs = ( void* )
31
32 /*
33 * sample rate; is this a good default value?
34 */
35 static unsigned long mac_asc_samplespersec = 1
36 static int mac_bell_duration;
37 static unsigned long mac_bell_phase; /* 0..2*P
38 static unsigned long mac_bell_phasepersample;
39
40 /*
41 * some function protos
42 */
43 static void mac_init_asc( void );
44 static void mac_nosound(struct timer_list *);
45 static void mac_quadra_start_bell( unsigned in
46 static void mac_quadra_ring_bell(struct timer_
47 static void mac_av_start_bell( unsigned int, u
48 static void ( *mac_special_bell )( unsigned in
49
50 /*
51 * our timer to start/continue/stop the bell
52 */
53 static DEFINE_TIMER(mac_sound_timer, mac_nosou
54
55 /*
56 * Sort of initialize the sound chip (called f
57 * beep).
58 */
59 static void mac_init_asc( void )
60 {
61 int i;
62
63 /*
64 * do some machine specific initializa
65 * BTW:
66 * the NetBSD Quadra patch identifies
67 * mac_asc_regs[ 0x800 ] & 0xF0 !
68 * this makes no sense here, because w
69 * rate anyway if we want correct freq
70 */
71 switch ( macintosh_config->ident )
72 {
73 case MAC_MODEL_IIFX:
74 /*
75 * The IIfx is always
76 */
77 mac_asc_regs = ( void*
78 break;
79 /*
80 * not sure about how
81 * machines with the E
82 */
83 case MAC_MODEL_Q630:
84 case MAC_MODEL_P475:
85 mac_special_bell = mac
86 mac_asc_samplespersec
87 break;
88 case MAC_MODEL_C660:
89 case MAC_MODEL_Q840:
90 /*
91 * The Quadra 660AV an
92 * It appears to be si
93 * [678]100. Because
94 * interface, this wou
95 * for AWACS could be
96 * do is figure out ho
97 * figure out where th
98 * vicinity of the AWA
99 * current location of
100 * Power Mac [678]100
101 *
102 * Quoted from Apple's
103 * "Among desktop Ma
104 * Macintosh models
105 * because of the AT
106 * codec circuitry i
107 * Converter (AWAC)
108 * 16-bit I/O functi
109 * support 16-bit st
110 *
111 * Technical Informa
112 * https://support.a
113 *
114 * --David Kilzer
115 */
116 mac_special_bell = mac
117 break;
118 case MAC_MODEL_Q650:
119 case MAC_MODEL_Q700:
120 case MAC_MODEL_Q800:
121 case MAC_MODEL_Q900:
122 case MAC_MODEL_Q950:
123 /*
124 * Currently not imple
125 */
126 mac_special_bell = NUL
127 break;
128 default:
129 /*
130 * Every switch needs
131 */
132 mac_special_bell = NUL
133 break;
134 }
135
136 /*
137 * init the wave table with a simple t
138 * A sine wave would sure be nicer her
139 */
140 for ( i = 0; i < 0x400; i++ )
141 {
142 mac_asc_wave_tab[ i ] = i / 4;
143 mac_asc_wave_tab[ i + 0x400 ]
144 }
145 mac_asc_inited = 1;
146 }
147
148 /*
149 * Called to make noise; current single entry
150 * Does the job for simple ASC, calls other ro
151 * XXX Fixme:
152 * Should be split into asc_mksound, easc_mkso
153 * function pointer set in mac_init_asc which
154 * init time.
155 * _This_ is rather ugly ...
156 */
157 void mac_mksound( unsigned int freq, unsigned
158 {
159 __u32 cfreq = ( freq << 5 ) / 468;
160 unsigned long flags;
161 int i;
162
163 if ( mac_special_bell == NULL )
164 {
165 /* Do nothing */
166 return;
167 }
168
169 if ( !mac_asc_inited )
170 mac_init_asc();
171
172 if ( mac_special_bell )
173 {
174 mac_special_bell( freq, length
175 return;
176 }
177
178 if ( freq < 20 || freq > 20000 || leng
179 {
180 mac_nosound( 0 );
181 return;
182 }
183
184 local_irq_save(flags);
185
186 del_timer( &mac_sound_timer );
187
188 for ( i = 0; i < 0x800; i++ )
189 mac_asc_regs[ i ] = 0;
190 for ( i = 0; i < 0x800; i++ )
191 mac_asc_regs[ i ] = mac_asc_wa
192
193 for ( i = 0; i < 8; i++ )
194 *( __u32* )( ( __u32 )mac_asc_
195
196 mac_asc_regs[ 0x807 ] = 0;
197 mac_asc_regs[ ASC_VOLUME ] = 128;
198 mac_asc_regs[ 0x805 ] = 0;
199 mac_asc_regs[ 0x80F ] = 0;
200 mac_asc_regs[ ASC_MODE ] = ASC_MODE_SA
201 mac_asc_regs[ ASC_ENABLE ] = ASC_ENABL
202
203 mac_sound_timer.expires = jiffies + le
204 add_timer( &mac_sound_timer );
205
206 local_irq_restore(flags);
207 }
208
209 /*
210 * regular ASC: stop whining ..
211 */
212 static void mac_nosound(struct timer_list *unu
213 {
214 mac_asc_regs[ ASC_ENABLE ] = 0;
215 }
216
217 /*
218 * EASC entry; init EASC, don't load wavetable
219 */
220 static void mac_quadra_start_bell( unsigned in
221 {
222 unsigned long flags;
223
224 /* if the bell is already ringing, rin
225 if ( mac_bell_duration > 0 )
226 {
227 mac_bell_duration += length;
228 return;
229 }
230
231 mac_bell_duration = length;
232 mac_bell_phase = 0;
233 mac_bell_phasepersample = ( freq * siz
234 /* this is reasonably big for small fr
235
236 local_irq_save(flags);
237
238 /* set the volume */
239 mac_asc_regs[ 0x806 ] = volume;
240
241 /* set up the ASC registers */
242 if ( mac_asc_regs[ 0x801 ] != 1 )
243 {
244 /* select mono mode */
245 mac_asc_regs[ 0x807 ] = 0;
246 /* select sampled sound mode *
247 mac_asc_regs[ 0x802 ] = 0;
248 /* ??? */
249 mac_asc_regs[ 0x801 ] = 1;
250 mac_asc_regs[ 0x803 ] |= 0x80;
251 mac_asc_regs[ 0x803 ] &= 0x7F;
252 }
253
254 mac_sound_timer.function = mac_quadra_
255 mac_sound_timer.expires = jiffies + 1;
256 add_timer( &mac_sound_timer );
257
258 local_irq_restore(flags);
259 }
260
261 /*
262 * EASC 'start/continue whining'; I'm not sure
263 * already load the wave table, or at least ca
264 * This piece keeps reloading the wave table u
265 */
266 static void mac_quadra_ring_bell(struct timer_
267 {
268 int i, count = mac_asc_samplespers
269 unsigned long flags;
270
271 /*
272 * we neither want a sound buffer over
273 * the number of samples per timer int
274 * using the asc interrupt will give b
275 * ...and the possibility to use a rea
276 */
277
278 local_irq_save(flags);
279
280 del_timer( &mac_sound_timer );
281
282 if ( mac_bell_duration-- > 0 )
283 {
284 for ( i = 0; i < count; i++ )
285 {
286 mac_bell_phase += mac_
287 mac_asc_regs[ 0 ] = ma
288 }
289 mac_sound_timer.expires = jiff
290 add_timer( &mac_sound_timer );
291 }
292 else
293 mac_asc_regs[ 0x801 ] = 0;
294
295 local_irq_restore(flags);
296 }
297
298 /*
299 * AV code - please fill in.
300 */
301 static void mac_av_start_bell( unsigned int fr
302 {
303 }
304
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