From 8e1e6f9b2939abd617b84c515a1018701a2cf082 Mon Sep 17 00:00:00 2001
From: Marcoen Hirschberg <marcoen@gmail.com>
Date: Fri, 29 Sep 2006 10:54:01 +0000
Subject: add the I2C driver for the Gigabeat

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@11090 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/SOURCES                                 |   1 +
 firmware/target/arm/gigabeat/meg-fx/i2c-meg-fx.c | 121 +++++++++++++++++++++++
 2 files changed, 122 insertions(+)
 create mode 100644 firmware/target/arm/gigabeat/meg-fx/i2c-meg-fx.c

diff --git a/firmware/SOURCES b/firmware/SOURCES
index 423fe0e..ffc2387 100644
--- a/firmware/SOURCES
+++ b/firmware/SOURCES
@@ -302,6 +302,7 @@ target/arm/gigabeat/meg-fx/usb-meg-fx.c
 target/arm/gigabeat/meg-fx/lcd-meg-fx.c
 target/arm/gigabeat/meg-fx/sc606-meg-fx.c
 target/arm/gigabeat/meg-fx/adc-meg-fx.c
+target/arm/gigabeat/meg-fx/i2c-meg-fx.c
 #endif
 #endif
 
diff --git a/firmware/target/arm/gigabeat/meg-fx/i2c-meg-fx.c b/firmware/target/arm/gigabeat/meg-fx/i2c-meg-fx.c
new file mode 100644
index 0000000..c0e9fb4
--- /dev/null
+++ b/firmware/target/arm/gigabeat/meg-fx/i2c-meg-fx.c
@@ -0,0 +1,121 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2006 by Linus Nielsen Feltzing
+ *
+ * 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 <stdbool.h>
+#include "kernel.h"
+#include "system.h"
+#include "hwcompat.h"
+#include "logf.h"
+#include "debug.h"
+#include "string.h"
+#include "generic_i2c.h"
+
+void i2c_sda_output(void)
+{
+    GPECON |= (1 << 30);
+}
+
+void i2c_sda_input(void)
+{
+    GPECON &= ~(3 << 30);
+}
+
+void i2c_sda_lo(void)
+{
+    GPEDAT &= ~(1 << 15);
+}
+
+void i2c_sda_hi(void)
+{
+    GPEDAT |= (1 << 15);
+}
+
+int i2c_sda(void)
+{
+    return GPEDAT & (1 << 15);
+}
+
+void i2c_scl_output(void)
+{
+    GPECON |= (1 << 28);
+}
+
+void i2c_scl_input(void)
+{
+    GPECON &= ~(3 << 28);
+}
+
+void i2c_scl_lo(void)
+{
+    GPEDAT &= ~(1 << 14);
+}
+
+int i2c_scl(void)
+{
+    return GPEDAT & (1 << 14);
+}
+
+void i2c_scl_hi(void)
+{
+    i2c_scl_input();
+    while(!i2c_scl());
+    GPEDAT |= (1 << 14);
+    i2c_scl_output();
+}
+
+void i2c_delay(void)
+{
+    do { int _x; for(_x=0;_x<2000;_x++);} while (0);
+}
+
+struct i2c_interface s3c2440_i2c = {
+    0x34, /* Address */
+
+    /* Bit-banged interface definitions */
+    i2c_scl_hi,  /* Drive SCL high, might sleep on clk stretch */
+    i2c_scl_lo,  /* Drive SCL low */
+    i2c_sda_hi,  /* Drive SDA high */
+    i2c_sda_lo,  /* Drive SDA low */
+    i2c_sda_input,  /* Set SDA as input */
+    i2c_sda_output, /* Set SDA as output */
+    i2c_scl_input,  /* Set SCL as input */
+    i2c_scl_output, /* Set SCL as output */
+    i2c_scl,      /* Read SCL, returns 0 or nonzero */
+    i2c_sda,      /* Read SDA, returns 0 or nonzero */
+
+    i2c_delay,  /* START SDA hold time (tHD:SDA) */
+    i2c_delay,  /* SDA hold time (tHD:DAT) */
+    i2c_delay,  /* SDA setup time (tSU:DAT) */
+    i2c_delay,  /* STOP setup time (tSU:STO) */
+    i2c_delay,  /* Rep. START setup time (tSU:STA) */
+    i2c_delay,  /* SCL high period (tHIGH) */
+};
+
+void i2c_init(void)
+{
+    /* Set GPE15 (SDA) and GPE14 (SCL) to 1 */
+    GPECON = (GPECON & ~(0xF<<28)) | 5<<28;
+    i2c_add_node(&s3c2440_i2c);
+}
+
+void i2c_send(int bus_address, int reg_address, const unsigned char buf)
+{
+    i2c_write_data(bus_address, reg_address, &buf, 1);
+}
-- 
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