S5L8700: Implement ADC driver

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@21734 a1c6a512-1295-4272-9138-f99709370657

firmware/export/config.h

@@ -554,7 +554,8 @@ Lyre prototype 1*/
 #endif /* BOOTLOADER */
 
 #if defined(HAVE_USBSTACK) || (CONFIG_CPU == JZ4732) \
-    || (CONFIG_CPU == AS3525) || (CONFIG_CPU == S3C2440)
+    || (CONFIG_CPU == AS3525) || (CONFIG_CPU == S3C2440) \
+    || (CONFIG_CPU == S5L8700)
 #define HAVE_WAKEUP_OBJECTS
 #endif
 

firmware/target/arm/s5l8700/adc-s5l8700.c

@@ -0,0 +1,94 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2009 by Bertrik Sikken
+ *
+ * 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 "config.h"
+
+#include "inttypes.h"
+#include "s5l8700.h"
+#include "adc.h"
+#include "adc-target.h"
+#include "kernel.h"
+
+/*  Driver for the built-in ADC of the s5l8700
+
+    The ADC is put into standby mode after each conversion.
+ */
+
+#define ADC_PRESCALER   100     /* 1MHz ADC clock, assuming 100 MHz PCLK */
+#define ADC_DEFAULT (1<<14) |                   /* prescale enable */   \
+                    ((ADC_PRESCALER-1)<<6) |    /* prescaler */         \
+                    (0<<3) |                    /* sel_mux */           \
+                    (0<<2) |                    /* stdbm */             \
+                    (0<<1) |                    /* read_start */        \
+                    (0<<0)                      /* enable start */      \
+
+
+static struct mutex adc_mtx;
+static struct wakeup adc_wakeup;
+
+void INT_ADC(void)
+{
+    wakeup_signal(&adc_wakeup);
+}
+
+unsigned short adc_read(int channel)
+{
+    unsigned short data;
+
+    mutex_lock(&adc_mtx);
+    
+    /* set channel and start conversion */
+    ADCCON = ADC_DEFAULT | 
+             (channel << 3) |
+             (1 << 0);          /* enable start */
+    
+    /* wait for conversion */
+    wakeup_wait(&adc_wakeup, TIMEOUT_BLOCK);
+    
+    /* get the converted data */
+    data = ADCDAT0;
+    
+    /* put ADC back into standby */
+    ADCCON |= (1 << 2);
+
+    mutex_unlock(&adc_mtx);
+    
+    return data;
+}
+
+void adc_init(void)
+{
+    mutex_init(&adc_mtx);
+    wakeup_init(&adc_wakeup);
+
+    /* enable clock to ADC */
+    PWRCON &= ~(1 << 10);
+    
+    /* configure ADC and put in standby */
+    ADCCON = ADC_DEFAULT | (1 << 2);
+    
+    /* configure conversion delay (use default) */
+    ADCDLY = 0xFF;
+    
+    /* enable interrupt */
+    INTMSK |= (1 << 31);
+}
+

firmware/target/arm/s5l8700/adc-target.h

@@ -21,15 +21,13 @@
 #ifndef _ADC_TARGET_H_
 #define _ADC_TARGET_H_
 
-/* only two channels used by the Gigabeat */
+#define NUM_ADC_CHANNELS 4
-#define NUM_ADC_CHANNELS 1
 
-#define ADC_UNKNOWN_1   0
+#define ADC_UNKNOWN_0   0
-#define ADC_UNKNOWN_2   1
+#define ADC_UNKNOWN_1   1
 #define ADC_BATTERY     2
-#define ADC_UNKNOWN_4   3
+#define ADC_UNKNOWN_3   3
 
 #define ADC_UNREG_POWER ADC_BATTERY /* For compatibility */
-#define ADC_READ_ERROR 0xFFFF
 
 #endif

firmware/target/arm/s5l8700/meizu-m6sl/adc-target.h

@@ -1,35 +0,0 @@
-/***************************************************************************
- *             __________               __   ___.
- *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
- *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
- *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
- *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
- *                     \/            \/     \/    \/            \/
- * $Id$
- *
- * Copyright (C) 2006 by Barry Wardell
- *
- * 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.
- *
- ****************************************************************************/
-#ifndef _ADC_TARGET_H_
-#define _ADC_TARGET_H_
-
-/* only two channels used by the Gigabeat */
-#define NUM_ADC_CHANNELS 1
-
-#define ADC_UNKNOWN_1   0
-#define ADC_UNKNOWN_2   1
-#define ADC_BATTERY     2
-#define ADC_UNKNOWN_4   3
-
-#define ADC_UNREG_POWER ADC_BATTERY /* For compatibility */
-#define ADC_READ_ERROR 0xFFFF
-
-#endif

firmware/target/arm/s5l8700/meizu-m6sp/adc-target.h

@@ -1,35 +0,0 @@
-/***************************************************************************
- *             __________               __   ___.
- *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
- *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
- *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
- *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
- *                     \/            \/     \/    \/            \/
- * $Id$
- *
- * Copyright (C) 2006 by Barry Wardell
- *
- * 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.
- *
- ****************************************************************************/
-#ifndef _ADC_TARGET_H_
-#define _ADC_TARGET_H_
-
-/* only two channels used by the Gigabeat */
-#define NUM_ADC_CHANNELS 1
-
-#define ADC_UNKNOWN_1   0
-#define ADC_UNKNOWN_2   1
-#define ADC_BATTERY     2
-#define ADC_UNKNOWN_4   3
-
-#define ADC_UNREG_POWER ADC_BATTERY /* For compatibility */
-#define ADC_READ_ERROR 0xFFFF
-
-#endif