FS#12524 - iPod Classic/6G: hardware click support

Based on the piezo driver for the nano2g.

Signed-off-by: Nils Wallménius <nils@rockbox.org>

firmware/SOURCES

@@ -1458,6 +1458,7 @@ target/arm/s5l8702/debug-s5l8702.c
 target/arm/s5l8702/pcm-s5l8702.c
 target/arm/s5l8702/ipod6g/audio-ipod6g.c
 target/arm/s5l8702/ipod6g/adc-ipod6g.c
+target/arm/s5l8702/ipod6g/piezo-ipod6g.c
 #endif
 #endif
 

firmware/export/config/ipod6g.h

@@ -204,6 +204,8 @@
 /* and doesn't handle them in the drive firmware */
 //#define MAX_PHYS_SECTOR_SIZE 4096
 
+#define HAVE_HARDWARE_CLICK
+
 /* Define this if you have adjustable CPU frequency */
 //#define HAVE_ADJUSTABLE_CPU_FREQ
 

firmware/target/arm/s5l8702/ipod6g/piezo-ipod6g.c

@@ -0,0 +1,95 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2006-2007 Robert Keevil
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+#include "system.h"
+#include "kernel.h"
+#include "piezo.h"
+
+static unsigned int duration;
+static bool beeping;
+
+void INT_TIMERA(void)
+{
+    /* clear interrupt */
+    TACON = TACON;
+    if (!(--duration))
+    {
+        beeping = 0;
+        TACMD = (1 << 1);   /* TA_CLR */
+    }
+}
+
+static void piezo_start(unsigned short cycles, unsigned short periods)
+{
+#ifndef SIMULATOR
+    duration = periods;
+    beeping = 1;
+    /* configure timer for 100 kHz */
+    TACMD = (1 << 1);   /* TA_CLR */
+    TAPRE = 30 - 1;     /* prescaler */         /* 12 MHz / 4 / 30 = 100 kHz */
+    TACON = (1 << 13) | /* TA_INT1_EN */
+            (0 << 12) | /* TA_INT0_EN */
+            (0 << 11) | /* TA_START */
+            (1 << 8) |  /* TA_CS = PCLK / 4 */
+            (1 << 6) |  /* UNKNOWN bit */       /* external 12 MHz clock ??? */
+            (1 << 4);   /* TA_MODE_SEL = PWM mode */
+    TADATA0 = cycles;   /* set interval period */
+    TADATA1 = cycles << 1; /* set interval period */
+    TACMD = (1 << 0);   /* TA_EN */
+#endif
+}
+
+void piezo_stop(void)
+{
+#ifndef SIMULATOR
+    TACMD = (1 << 1);   /* TA_CLR */
+#endif
+}
+
+void piezo_clear(void)
+{
+    piezo_stop();
+}
+
+bool piezo_busy(void)
+{
+    return beeping;
+}
+
+void piezo_init(void)
+{
+    beeping = 0;
+}
+
+void piezo_button_beep(bool beep, bool force)
+{
+    if (force)
+        while (beeping)
+            yield();
+
+    if (!beeping)
+    {
+        if (beep)
+            piezo_start(22, 457);
+        else
+            piezo_start(40, 4);
+    }
+}

firmware/target/arm/s5l8702/ipod6g/piezo.h

@@ -0,0 +1,26 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2006-2007 Robert Keevil
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+void piezo_init(void);
+void piezo_stop(void);
+void piezo_clear(void);
+bool piezo_busy(void);
+void piezo_button_beep(bool beep, bool force);