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Linux/arch/m68k/amiga/amisound.c

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Diff markup

Differences between /arch/m68k/amiga/amisound.c (Architecture m68k) and /arch/ppc/amiga/amisound.c (Architecture ppc)


  1 /*                                                  1 
  2  * linux/arch/m68k/amiga/amisound.c               
  3  *                                                
  4  * amiga sound driver for Linux/m68k              
  5  *                                                
  6  * This file is subject to the terms and condi    
  7  * License.  See the file COPYING in the main     
  8  * for more details.                              
  9  */                                               
 10                                                   
 11 #include <linux/jiffies.h>                        
 12 #include <linux/timer.h>                          
 13 #include <linux/init.h>                           
 14 #include <linux/string.h>                         
 15 #include <linux/module.h>                         
 16                                                   
 17 #include <asm/amigahw.h>                          
 18                                                   
 19 #include "amiga.h"                                
 20                                                   
 21 static unsigned short *snd_data;                  
 22 static const signed char sine_data[] = {          
 23         0,  39,  75,  103,  121,  127,  121,      
 24         0, -39, -75, -103, -121, -127, -121, -    
 25 };                                                
 26 #define DATA_SIZE       ARRAY_SIZE(sine_data)     
 27                                                   
 28 #define custom amiga_custom                       
 29                                                   
 30     /*                                            
 31      * The minimum period for audio may be mod    
 32      * device since it depends on htotal (for     
 33      */                                           
 34                                                   
 35 volatile unsigned short amiga_audio_min_period    
 36 EXPORT_SYMBOL(amiga_audio_min_period);            
 37                                                   
 38 #define MAX_PERIOD      (65535)                   
 39                                                   
 40                                                   
 41     /*                                            
 42      *  Current period (set by dmasound.c)        
 43      */                                           
 44                                                   
 45 unsigned short amiga_audio_period = MAX_PERIOD    
 46 EXPORT_SYMBOL(amiga_audio_period);                
 47                                                   
 48 static unsigned long clock_constant;              
 49                                                   
 50 void __init amiga_init_sound(void)                
 51 {                                                 
 52         static struct resource beep_res = { .n    
 53                                                   
 54         snd_data = amiga_chip_alloc_res(sizeof    
 55         if (!snd_data) {                          
 56                 pr_crit("amiga init_sound: fai    
 57                 return;                           
 58         }                                         
 59         memcpy (snd_data, sine_data, sizeof(si    
 60                                                   
 61         /* setup divisor */                       
 62         clock_constant = (amiga_colorclock+DAT    
 63                                                   
 64         /* without amifb, turn video off and e    
 65 #ifndef CONFIG_FB_AMIGA                           
 66         amifb_video_off();                        
 67 #endif                                            
 68 }                                                 
 69                                                   
 70 static void nosound(struct timer_list *unused)    
 71 static DEFINE_TIMER(sound_timer, nosound);        
 72                                                   
 73 void amiga_mksound( unsigned int hz, unsigned     
 74 {                                                 
 75         unsigned long flags;                      
 76                                                   
 77         if (!snd_data)                            
 78                 return;                           
 79                                                   
 80         local_irq_save(flags);                    
 81         del_timer( &sound_timer );                
 82                                                   
 83         if (hz > 20 && hz < 32767) {              
 84                 unsigned long period = (clock_    
 85                                                   
 86                 if (period < amiga_audio_min_p    
 87                         period = amiga_audio_m    
 88                 if (period > MAX_PERIOD)          
 89                         period = MAX_PERIOD;      
 90                                                   
 91                 /* setup pointer to data, peri    
 92                 custom.aud[2].audlc = snd_data    
 93                 custom.aud[2].audlen = sizeof(    
 94                 custom.aud[2].audper = (unsign    
 95                 custom.aud[2].audvol = 32; /*     
 96                                                   
 97                 if (ticks) {                      
 98                         sound_timer.expires =     
 99                         add_timer( &sound_time    
100                 }                                 
101                                                   
102                 /* turn on DMA for audio chann    
103                 custom.dmacon = DMAF_SETCLR |     
104                                                   
105         } else                                    
106                 nosound( 0 );                     
107                                                   
108         local_irq_restore(flags);                 
109 }                                                 
110                                                   
111                                                   
112 static void nosound(struct timer_list *unused)    
113 {                                                 
114         /* turn off DMA for audio channel 2 */    
115         custom.dmacon = DMAF_AUD2;                
116         /* restore period to previous value af    
117         custom.aud[2].audper = amiga_audio_per    
118 }                                                 
119                                                   

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