1 files changed, 109 insertions, 0 deletions
diff --git a/arch/m68k/atari/atasound.c b/arch/m68k/atari/atasound.c
new file mode 100644
index 0000000..ee04250
--- /dev/null
+++ b/arch/m68k/atari/atasound.c
@@ -0,0 +1,109 @@
+/*
+ * linux/arch/m68k/atari/atasound.c
+ *
+ * ++Geert: Moved almost all stuff to linux/drivers/sound/
+ *
+ * The author of atari_nosound, atari_mksound and atari_microwire_cmd is
+ * unknown. (++roman: That's me... :-)
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file COPYING in the main directory of this archive
+ * for more details.
+ *
+ * 1998-05-31 ++andreas: atari_mksound rewritten to always use the envelope,
+ *			 no timer, atari_nosound removed.
+ *
+ */
+
+
+#include <linux/sched.h>
+#include <linux/timer.h>
+#include <linux/major.h>
+#include <linux/fcntl.h>
+#include <linux/errno.h>
+#include <linux/mm.h>
+
+#include <asm/atarihw.h>
+#include <asm/system.h>
+#include <asm/irq.h>
+#include <asm/pgtable.h>
+#include <asm/atariints.h>
+
+
+/*
+ * stuff from the old atasound.c
+ */
+
+void atari_microwire_cmd (int cmd)
+{
+	tt_microwire.mask = 0x7ff;
+	tt_microwire.data = MW_LM1992_ADDR | cmd;
+
+	/* Busy wait for data being completely sent :-( */
+	while( tt_microwire.mask != 0x7ff)
+		;
+}
+
+
+/* PSG base frequency */
+#define	PSG_FREQ	125000
+/* PSG envelope base frequency times 10 */
+#define PSG_ENV_FREQ_10	78125
+
+void atari_mksound (unsigned int hz, unsigned int ticks)
+{
+	/* Generates sound of some frequency for some number of clock
+	   ticks.  */
+	unsigned long flags;
+	unsigned char tmp;
+	int period;
+
+	local_irq_save(flags);
+
+
+	/* Disable generator A in mixer control.  */
+	sound_ym.rd_data_reg_sel = 7;
+	tmp = sound_ym.rd_data_reg_sel;
+	tmp |= 011;
+	sound_ym.wd_data = tmp;
+
+	if (hz) {
+	    /* Convert from frequency value to PSG period value (base
+	       frequency 125 kHz).  */
+
+	    period = PSG_FREQ / hz;
+
+	    if (period > 0xfff) period = 0xfff;
+
+	/* Set generator A frequency to hz.  */
+	sound_ym.rd_data_reg_sel = 0;
+	sound_ym.wd_data = period & 0xff;
+	sound_ym.rd_data_reg_sel = 1;
+	sound_ym.wd_data = (period >> 8) & 0xf;
+	if (ticks) {
+		/* Set length of envelope (max 8 sec).  */
+		int length = (ticks * PSG_ENV_FREQ_10) / HZ / 10;
+
+		if (length > 0xffff) length = 0xffff;
+		sound_ym.rd_data_reg_sel = 11;
+		sound_ym.wd_data = length & 0xff;
+		sound_ym.rd_data_reg_sel = 12;
+		sound_ym.wd_data = length >> 8;
+		/* Envelope form: max -> min single.  */
+		sound_ym.rd_data_reg_sel = 13;
+		sound_ym.wd_data = 0;
+		/* Use envelope for generator A.  */
+		sound_ym.rd_data_reg_sel = 8;
+		sound_ym.wd_data = 0x10;
+	} else {
+		/* Set generator A level to maximum, no envelope.  */
+		sound_ym.rd_data_reg_sel = 8;
+		sound_ym.wd_data = 15;
+	}
+	/* Turn on generator A in mixer control.  */
+	sound_ym.rd_data_reg_sel = 7;
+	tmp &= ~1;
+	sound_ym.wd_data = tmp;
+	}
+	local_irq_restore(flags);
+}