1 files changed, 100 insertions, 0 deletions

diff --git a/firmware/target/arm/ipod/1g2g/adc-ipod-1g2g.c b/firmware/target/arm/ipod/1g2g/adc-ipod-1g2g.c
new file mode 100644
index 0000000000..759b6fb592
--- /dev/null
+++ b/firmware/target/arm/ipod/1g2g/adc-ipod-1g2g.c
@@ -0,0 +1,100 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2007 by Jens Arnold
+ *
+ * All files in this archive are subject to the GNU General Public License.
+ * See the file COPYING in the source tree root for full license agreement.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+#include "config.h"
+#include "cpu.h"
+#include "hwcompat.h"
+#include "kernel.h"
+
+static struct mutex adc_mutex NOCACHEBSS_ATTR;
+
+unsigned short adc_scan(int channel)
+{
+    int i, j;
+    unsigned short data = 0;
+    unsigned pval;
+
+    (void)channel; /* there is only one */
+    spinlock_lock(&adc_mutex);
+
+    if ((IPOD_HW_REVISION >> 16) == 1)
+    {
+        pval = GPIOB_OUTPUT_VAL;
+        GPIOB_OUTPUT_VAL = pval | 0x04;  /* B2 -> high */
+        for (i = 32; i > 0; --i);
+
+        GPIOB_OUTPUT_VAL = pval;         /* B2 -> low */
+        for (i = 200; i > 0; --i);
+
+        for (j = 0; j < 8; j++)
+        {
+            GPIOB_OUTPUT_VAL = pval | 0x02; /* B1 -> high */
+            for (i = 8; i > 0; --i);
+
+            data = (data << 1) | ((GPIOB_INPUT_VAL & 0x08) >> 3);
+
+            GPIOB_OUTPUT_VAL = pval;     /* B1 -> low */
+            for (i = 320; i > 0; --i);
+        }
+    }
+    else if ((IPOD_HW_REVISION >> 16) == 2)
+    {
+        pval = GPIOB_OUTPUT_VAL;
+        GPIOB_OUTPUT_VAL = pval | 0x0a;  /* B1, B3 -> high */
+        while (!(GPIOB_INPUT_VAL & 0x04)); /* wait for B2 == 1 */
+
+        GPIOB_OUTPUT_VAL = pval;         /* B1, B3 -> low */
+        while (GPIOB_INPUT_VAL & 0x04);  /* wait for B2 == 0 */
+
+        for (j = 0; j < 8; j++)
+        {
+            GPIOB_OUTPUT_VAL = pval | 0x02; /* B1 -> high */
+            while (!(GPIOB_INPUT_VAL & 0x04)); /* wait for B2 == 1 */
+
+            data = (data << 1) | ((GPIOB_INPUT_VAL & 0x10) >> 4);
+
+            GPIOB_OUTPUT_VAL = pval;     /* B1 -> low */
+            while (GPIOB_INPUT_VAL & 0x04); /* wait for B2 == 0 */
+        }
+    }
+    spinlock_unlock(&adc_mutex);
+    return data;
+}
+
+void adc_init(void)
+{
+    spinlock_init(&adc_mutex);
+    
+    GPIOB_ENABLE |= 0x1e;  /* enable B1..B4 */
+
+    if ((IPOD_HW_REVISION >> 16) == 1)
+    {
+        GPIOB_OUTPUT_EN  = (GPIOB_OUTPUT_EN & ~0x08) | 0x16;
+                                         /* B1, B2, B4 -> output, B3 -> input */
+        GPIOB_OUTPUT_VAL = (GPIOB_OUTPUT_VAL & ~0x06) | 0x10;
+                                         /* B1, B2 -> low, B4 -> high */
+    }
+    else if ((IPOD_HW_REVISION >> 16) == 2)
+    {
+        GPIOB_OUTPUT_EN   = (GPIOB_OUTPUT_EN & ~0x14) | 0x0a;
+                                         /* B1, B3 -> output, B2, B4 -> input */
+        GPIOB_OUTPUT_VAL &= ~0x0a;       /* B1, B3 -> low */
+        while (GPIOB_INPUT_VAL & 0x04);  /* wait for B2 == 0 */
+    }
+}