/*
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/*
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linux/arch/m68k/atari/atasound.c
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linux/arch/m68k/atari/atasound.c
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++Geert: Moved almost all stuff to linux/drivers/sound/
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++Geert: Moved almost all stuff to linux/drivers/sound/
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The author of atari_nosound, atari_mksound and atari_microwire_cmd is
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The author of atari_nosound, atari_mksound and atari_microwire_cmd is
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unknown.
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unknown.
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(++roman: That's me... :-)
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(++roman: That's me... :-)
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This file is subject to the terms and conditions of the GNU General Public
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This file is subject to the terms and conditions of the GNU General Public
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License. See the file COPYING in the main directory of this archive
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License. See the file COPYING in the main directory of this archive
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for more details.
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for more details.
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*/
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*/
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#include <linux/sched.h>
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#include <linux/sched.h>
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#include <linux/timer.h>
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#include <linux/timer.h>
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#include <linux/major.h>
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#include <linux/major.h>
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#include <linux/fcntl.h>
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#include <linux/fcntl.h>
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#include <linux/errno.h>
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#include <linux/errno.h>
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#include <linux/mm.h>
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#include <linux/mm.h>
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#include <asm/atarihw.h>
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#include <asm/atarihw.h>
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#include <asm/system.h>
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#include <asm/system.h>
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#include <asm/irq.h>
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#include <asm/irq.h>
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#include <asm/pgtable.h>
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#include <asm/pgtable.h>
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#include <asm/atariints.h>
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#include <asm/atariints.h>
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#include <asm/bootinfo.h>
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#include <asm/bootinfo.h>
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/*
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/*
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* stuff from the old atasound.c
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* stuff from the old atasound.c
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*/
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*/
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static void atari_nosound (unsigned long ignored)
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static void atari_nosound (unsigned long ignored)
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{
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{
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unsigned char tmp;
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unsigned char tmp;
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unsigned long flags;
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unsigned long flags;
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/* turn off generator A in mixer control */
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/* turn off generator A in mixer control */
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save_flags(flags);
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save_flags(flags);
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cli();
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cli();
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sound_ym.rd_data_reg_sel = 7;
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sound_ym.rd_data_reg_sel = 7;
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tmp = sound_ym.rd_data_reg_sel;
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tmp = sound_ym.rd_data_reg_sel;
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sound_ym.wd_data = tmp | 0x39;
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sound_ym.wd_data = tmp | 0x39;
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restore_flags(flags);
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restore_flags(flags);
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}
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}
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void atari_microwire_cmd (int cmd)
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void atari_microwire_cmd (int cmd)
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{
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{
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tt_microwire.mask = 0x7ff;
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tt_microwire.mask = 0x7ff;
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tt_microwire.data = MW_LM1992_ADDR | cmd;
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tt_microwire.data = MW_LM1992_ADDR | cmd;
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/* Busy wait for data being completely sent :-( */
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/* Busy wait for data being completely sent :-( */
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while( tt_microwire.mask != 0x7ff)
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while( tt_microwire.mask != 0x7ff)
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;
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;
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}
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}
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#define PC_FREQ 1192180
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#define PC_FREQ 1192180
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#define PSG_FREQ 125000
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#define PSG_FREQ 125000
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void atari_mksound (unsigned int count, unsigned int ticks)
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void atari_mksound (unsigned int count, unsigned int ticks)
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{
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{
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static struct timer_list sound_timer = { NULL, NULL, 0, 0,
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static struct timer_list sound_timer = { NULL, NULL, 0, 0,
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atari_nosound };
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atari_nosound };
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/*
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/*
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* Generates sound of some count for some number of clock ticks
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* Generates sound of some count for some number of clock ticks
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* [count = 1193180 / frequency]
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* [count = 1193180 / frequency]
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*/
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*/
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unsigned long flags;
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unsigned long flags;
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unsigned char tmp;
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unsigned char tmp;
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save_flags(flags);
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save_flags(flags);
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cli();
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cli();
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if (count == 750 && ticks == HZ/8) {
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if (count == 750 && ticks == HZ/8) {
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/* Special case: These values are used by console.c to
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/* Special case: These values are used by console.c to
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* generate the console bell. They are cached here and the
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* generate the console bell. They are cached here and the
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* sound actually generated is somehow special: it uses the
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* sound actually generated is somehow special: it uses the
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* generator B and an envelope. No timer is needed therefore
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* generator B and an envelope. No timer is needed therefore
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* and the bell doesn't disturb an other ongoing sound.
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* and the bell doesn't disturb an other ongoing sound.
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*/
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*/
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/* set envelope duration to 492 ms */
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/* set envelope duration to 492 ms */
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sound_ym.rd_data_reg_sel = 11;
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sound_ym.rd_data_reg_sel = 11;
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sound_ym.wd_data = 0;
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sound_ym.wd_data = 0;
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sound_ym.rd_data_reg_sel = 12;
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sound_ym.rd_data_reg_sel = 12;
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sound_ym.wd_data = 15;
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sound_ym.wd_data = 15;
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/* envelope form: max -> min single */
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/* envelope form: max -> min single */
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sound_ym.rd_data_reg_sel = 13;
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sound_ym.rd_data_reg_sel = 13;
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sound_ym.wd_data = 9;
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sound_ym.wd_data = 9;
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/* set generator B frequency to 2400 Hz */
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/* set generator B frequency to 2400 Hz */
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sound_ym.rd_data_reg_sel = 2;
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sound_ym.rd_data_reg_sel = 2;
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sound_ym.wd_data = 52;
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sound_ym.wd_data = 52;
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sound_ym.rd_data_reg_sel = 3;
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sound_ym.rd_data_reg_sel = 3;
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sound_ym.wd_data = 0;
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sound_ym.wd_data = 0;
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/* set volume of generator B to envelope control */
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/* set volume of generator B to envelope control */
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sound_ym.rd_data_reg_sel = 9;
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sound_ym.rd_data_reg_sel = 9;
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sound_ym.wd_data = 0x10;
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sound_ym.wd_data = 0x10;
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/* enable generator B in the mixer control */
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/* enable generator B in the mixer control */
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sound_ym.rd_data_reg_sel = 7;
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sound_ym.rd_data_reg_sel = 7;
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tmp = sound_ym.rd_data_reg_sel;
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tmp = sound_ym.rd_data_reg_sel;
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sound_ym.wd_data = (tmp & ~0x02) | 0x38;
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sound_ym.wd_data = (tmp & ~0x02) | 0x38;
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restore_flags(flags);
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restore_flags(flags);
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return;
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return;
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}
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}
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del_timer( &sound_timer );
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del_timer( &sound_timer );
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if (!count) {
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if (!count) {
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atari_nosound( 0 );
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atari_nosound( 0 );
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}
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}
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else {
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else {
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/* convert from PC counter value (base frequency 1.193 MHz)
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/* convert from PC counter value (base frequency 1.193 MHz)
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* to PSG period value (base frequency 125 kHz).
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* to PSG period value (base frequency 125 kHz).
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*/
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*/
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int period = (PSG_FREQ * count + PC_FREQ/2) / PC_FREQ;
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int period = (PSG_FREQ * count + PC_FREQ/2) / PC_FREQ;
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if (period > 0xfff) period = 0xfff;
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if (period > 0xfff) period = 0xfff;
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/* set generator A frequency to 0 */
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/* set generator A frequency to 0 */
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sound_ym.rd_data_reg_sel = 0;
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sound_ym.rd_data_reg_sel = 0;
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sound_ym.wd_data = period & 0xff;
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sound_ym.wd_data = period & 0xff;
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sound_ym.rd_data_reg_sel = 1;
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sound_ym.rd_data_reg_sel = 1;
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sound_ym.wd_data = (period >> 8) & 0xf;
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sound_ym.wd_data = (period >> 8) & 0xf;
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/* turn on generator A in mixer control (but not noise
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/* turn on generator A in mixer control (but not noise
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* generator!) */
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* generator!) */
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sound_ym.rd_data_reg_sel = 7;
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sound_ym.rd_data_reg_sel = 7;
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tmp = sound_ym.rd_data_reg_sel;
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tmp = sound_ym.rd_data_reg_sel;
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sound_ym.wd_data = (tmp & ~0x01) | 0x38;
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sound_ym.wd_data = (tmp & ~0x01) | 0x38;
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/* set generator A level to maximum, no envelope */
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/* set generator A level to maximum, no envelope */
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sound_ym.rd_data_reg_sel = 8;
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sound_ym.rd_data_reg_sel = 8;
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sound_ym.wd_data = 15;
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sound_ym.wd_data = 15;
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if (ticks) {
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if (ticks) {
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sound_timer.expires = jiffies + ticks;
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sound_timer.expires = jiffies + ticks;
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add_timer( &sound_timer );
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add_timer( &sound_timer );
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}
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}
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}
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}
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restore_flags(flags);
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restore_flags(flags);
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}
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}
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