1 files changed, 134 insertions, 0 deletions

diff --git a/firmware/target/arm/s3c2440/gigabeat-fx/i2c-meg-fx.c b/firmware/target/arm/s3c2440/gigabeat-fx/i2c-meg-fx.c
new file mode 100644
index 0000000000..670d6cd04c
--- /dev/null
+++ b/firmware/target/arm/s3c2440/gigabeat-fx/i2c-meg-fx.c
@@ -0,0 +1,134 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   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 "logf.h"
+#include "debug.h"
+#include "string.h"
+#include "generic_i2c.h"
+
+static void i2c_sda_output(void)
+{
+    GPECON |= (1 << 30);
+}
+
+static void i2c_sda_input(void)
+{
+    GPECON &= ~(3 << 30);
+}
+
+static void i2c_sda_lo(void)
+{
+    GPEDAT &= ~(1 << 15);
+}
+
+static void i2c_sda_hi(void)
+{
+    GPEDAT |= (1 << 15);
+}
+
+static int i2c_sda(void)
+{
+    return GPEDAT & (1 << 15);
+}
+
+static void i2c_scl_output(void)
+{
+    GPECON |= (1 << 28);
+}
+
+static void i2c_scl_input(void)
+{
+    GPECON &= ~(3 << 28);
+}
+
+static void i2c_scl_lo(void)
+{
+    GPEDAT &= ~(1 << 14);
+}
+
+static int i2c_scl(void)
+{
+    return GPEDAT & (1 << 14);
+}
+
+static void i2c_scl_hi(void)
+{
+    i2c_scl_input();
+    while(!i2c_scl());
+    GPEDAT |= (1 << 14);
+    i2c_scl_output();
+}
+
+
+
+static void i2c_delay(void)
+{
+     unsigned _x;
+
+    /* The i2c can clock at 500KHz: 2uS period -> 1uS half period */
+    /* about 30 cycles overhead + X * 7 */
+    /* 300MHz: 1000nS @3.36nS/cyc = 297cyc: X = 38*/
+    /* 100MHz: 1000nS @10nS/cyc = 100cyc : X = 10 */
+    for (_x = 38; _x; _x--)
+    {
+        /* burn CPU cycles */
+        /* gcc makes it an inc loop - check with objdump for asm timing */
+    }
+}
+
+
+
+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);
+}