Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 113 insertions, 0 deletions

diff --git a/arch/m68k/amiga/amisound.c b/arch/m68k/amiga/amisound.c
new file mode 100644
index 000000000000..cb5d93630467
--- /dev/null
+++ b/arch/m68k/amiga/amisound.c
@@ -0,0 +1,113 @@
+/*
+ * linux/arch/m68k/amiga/amisound.c
+ *
+ * amiga sound driver for Linux/m68k
+ *
+ * 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.
+ */
+
+#include <linux/config.h>
+#include <linux/jiffies.h>
+#include <linux/timer.h>
+#include <linux/init.h>
+#include <linux/string.h>
+
+#include <asm/system.h>
+#include <asm/amigahw.h>
+
+static unsigned short *snd_data;
+static const signed char sine_data[] = {
+        0,  39,  75,  103,  121,  127,  121,  103,  75,  39,
+        0, -39, -75, -103, -121, -127, -121, -103, -75, -39
+};
+#define DATA_SIZE       (sizeof(sine_data)/sizeof(sine_data[0]))
+
+    /*
+     * The minimum period for audio may be modified by the frame buffer
+     * device since it depends on htotal (for OCS/ECS/AGA)
+     */
+
+volatile unsigned short amiga_audio_min_period = 124; /* Default for pre-OCS */
+
+#define MAX_PERIOD      (65535)
+
+
+    /*
+     *  Current period (set by dmasound.c)
+     */
+
+unsigned short amiga_audio_period = MAX_PERIOD;
+
+static unsigned long clock_constant;
+
+void __init amiga_init_sound(void)
+{
+        static struct resource beep_res = { .name = "Beep" };
+
+        snd_data = amiga_chip_alloc_res(sizeof(sine_data), &beep_res);
+        if (!snd_data) {
+                printk (KERN_CRIT "amiga init_sound: failed to allocate chipmem\n");
+                return;
+        }
+        memcpy (snd_data, sine_data, sizeof(sine_data));
+
+        /* setup divisor */
+        clock_constant = (amiga_colorclock+DATA_SIZE/2)/DATA_SIZE;
+
+        /* without amifb, turn video off and enable high quality sound */
+#ifndef CONFIG_FB_AMIGA
+        amifb_video_off();
+#endif
+}
+
+static void nosound( unsigned long ignored );
+static struct timer_list sound_timer = TIMER_INITIALIZER(nosound, 0, 0);
+
+void amiga_mksound( unsigned int hz, unsigned int ticks )
+{
+        unsigned long flags;
+
+        if (!snd_data)
+                return;
+
+        local_irq_save(flags);
+        del_timer( &sound_timer );
+
+        if (hz > 20 && hz < 32767) {
+                unsigned long period = (clock_constant / hz);
+
+                if (period < amiga_audio_min_period)
+                        period = amiga_audio_min_period;
+                if (period > MAX_PERIOD)
+                        period = MAX_PERIOD;
+
+                /* setup pointer to data, period, length and volume */
+                custom.aud[2].audlc = snd_data;
+                custom.aud[2].audlen = sizeof(sine_data)/2;
+                custom.aud[2].audper = (unsigned short)period;
+                custom.aud[2].audvol = 32; /* 50% of maxvol */
+
+                if (ticks) {
+                        sound_timer.expires = jiffies + ticks;
+                        add_timer( &sound_timer );
+                }
+
+                /* turn on DMA for audio channel 2 */
+                custom.dmacon = DMAF_SETCLR | DMAF_AUD2;
+
+        } else
+                nosound( 0 );
+
+        local_irq_restore(flags);
+}
+
+
+static void nosound( unsigned long ignored )
+{
+        /* turn off DMA for audio channel 2 */
+        custom.dmacon = DMAF_AUD2;
+        /* restore period to previous value after beeping */
+        custom.aud[2].audper = amiga_audio_period;
+}