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Linux/arch/m68k/atari/atasound.c

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  1 /*
  2  * linux/arch/m68k/atari/atasound.c
  3  *
  4  * ++Geert: Moved almost all stuff to linux/drivers/sound/
  5  *
  6  * The author of atari_nosound, atari_mksound and atari_microwire_cmd is
  7  * unknown. (++roman: That's me... :-)
  8  *
  9  * This file is subject to the terms and conditions of the GNU General Public
 10  * License.  See the file COPYING in the main directory of this archive
 11  * for more details.
 12  *
 13  * 1998-05-31 ++andreas: atari_mksound rewritten to always use the envelope,
 14  *                       no timer, atari_nosound removed.
 15  *
 16  */
 17 
 18 
 19 #include <linux/sched.h>
 20 #include <linux/timer.h>
 21 #include <linux/major.h>
 22 #include <linux/fcntl.h>
 23 #include <linux/errno.h>
 24 #include <linux/mm.h>
 25 #include <linux/module.h>
 26 
 27 #include <asm/atarihw.h>
 28 #include <asm/irq.h>
 29 #include <asm/pgtable.h>
 30 #include <asm/atariints.h>
 31 
 32 
 33 /*
 34  * stuff from the old atasound.c
 35  */
 36 
 37 void atari_microwire_cmd (int cmd)
 38 {
 39         tt_microwire.mask = 0x7ff;
 40         tt_microwire.data = MW_LM1992_ADDR | cmd;
 41 
 42         /* Busy wait for data being completely sent :-( */
 43         while( tt_microwire.mask != 0x7ff)
 44                 ;
 45 }
 46 EXPORT_SYMBOL(atari_microwire_cmd);
 47 
 48 
 49 /* PSG base frequency */
 50 #define PSG_FREQ        125000
 51 /* PSG envelope base frequency times 10 */
 52 #define PSG_ENV_FREQ_10 78125
 53 
 54 void atari_mksound (unsigned int hz, unsigned int ticks)
 55 {
 56         /* Generates sound of some frequency for some number of clock
 57            ticks.  */
 58         unsigned long flags;
 59         unsigned char tmp;
 60         int period;
 61 
 62         local_irq_save(flags);
 63 
 64 
 65         /* Disable generator A in mixer control.  */
 66         sound_ym.rd_data_reg_sel = 7;
 67         tmp = sound_ym.rd_data_reg_sel;
 68         tmp |= 011;
 69         sound_ym.wd_data = tmp;
 70 
 71         if (hz) {
 72             /* Convert from frequency value to PSG period value (base
 73                frequency 125 kHz).  */
 74 
 75             period = PSG_FREQ / hz;
 76 
 77             if (period > 0xfff) period = 0xfff;
 78 
 79         /* Set generator A frequency to hz.  */
 80         sound_ym.rd_data_reg_sel = 0;
 81         sound_ym.wd_data = period & 0xff;
 82         sound_ym.rd_data_reg_sel = 1;
 83         sound_ym.wd_data = (period >> 8) & 0xf;
 84         if (ticks) {
 85                 /* Set length of envelope (max 8 sec).  */
 86                 int length = (ticks * PSG_ENV_FREQ_10) / HZ / 10;
 87 
 88                 if (length > 0xffff) length = 0xffff;
 89                 sound_ym.rd_data_reg_sel = 11;
 90                 sound_ym.wd_data = length & 0xff;
 91                 sound_ym.rd_data_reg_sel = 12;
 92                 sound_ym.wd_data = length >> 8;
 93                 /* Envelope form: max -> min single.  */
 94                 sound_ym.rd_data_reg_sel = 13;
 95                 sound_ym.wd_data = 0;
 96                 /* Use envelope for generator A.  */
 97                 sound_ym.rd_data_reg_sel = 8;
 98                 sound_ym.wd_data = 0x10;
 99         } else {
100                 /* Set generator A level to maximum, no envelope.  */
101                 sound_ym.rd_data_reg_sel = 8;
102                 sound_ym.wd_data = 15;
103         }
104         /* Turn on generator A in mixer control.  */
105         sound_ym.rd_data_reg_sel = 7;
106         tmp &= ~1;
107         sound_ym.wd_data = tmp;
108         }
109         local_irq_restore(flags);
110 }
111 

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