--- /dev/null
+Index: linux-2.6.30.9/drivers/i2c/busses/Kconfig
+===================================================================
+--- linux-2.6.30.9.orig/drivers/i2c/busses/Kconfig 2009-11-24 21:00:21.000000000 +0100
++++ linux-2.6.30.9/drivers/i2c/busses/Kconfig 2009-11-24 21:00:23.000000000 +0100
+@@ -326,6 +326,10 @@
+ devices such as DaVinci NIC.
+ For details please see http://www.ti.com/davinci
+
++config I2C_EP93XX
++ tristate "EP93XX I2C"
++ depends on I2C && ARCH_EP93XX
++
+ config I2C_GPIO
+ tristate "GPIO-based bitbanging I2C"
+ depends on GENERIC_GPIO
+Index: linux-2.6.30.9/drivers/i2c/busses/Makefile
+===================================================================
+--- linux-2.6.30.9.orig/drivers/i2c/busses/Makefile 2009-11-24 21:00:21.000000000 +0100
++++ linux-2.6.30.9/drivers/i2c/busses/Makefile 2009-11-24 21:00:23.000000000 +0100
+@@ -30,6 +30,7 @@
+ obj-$(CONFIG_I2C_BLACKFIN_TWI) += i2c-bfin-twi.o
+ obj-$(CONFIG_I2C_CPM) += i2c-cpm.o
+ obj-$(CONFIG_I2C_DAVINCI) += i2c-davinci.o
++obj-$(CONFIG_I2C_EP93XX) += i2c-ep93xx.o
+ obj-$(CONFIG_I2C_GPIO) += i2c-gpio.o
+ obj-$(CONFIG_I2C_HIGHLANDER) += i2c-highlander.o
+ obj-$(CONFIG_I2C_IBM_IIC) += i2c-ibm_iic.o
+Index: linux-2.6.30.9/drivers/i2c/busses/i2c-ep93xx.c
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ linux-2.6.30.9/drivers/i2c/busses/i2c-ep93xx.c 2009-11-24 21:00:38.000000000 +0100
+@@ -0,0 +1,193 @@
++/* ------------------------------------------------------------------------ *
++ * i2c-ep933xx.c I2C bus glue for Cirrus EP93xx *
++ * ------------------------------------------------------------------------ *
++
++ Copyright (C) 2004 Michael Burian
++
++ Based on i2c-parport-light.c
++ Copyright (C) 2003-2004 Jean Delvare <khali@linux-fr.org>
++
++ 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 program is distributed in the hope that it will be useful,
++ but WITHOUT ANY WARRANTY; without even the implied warranty of
++ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
++ GNU General Public License for more details.
++
++ You should have received a copy of the GNU General Public License
++ along with this program; if not, write to the Free Software
++ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
++ * ------------------------------------------------------------------------ */
++
++
++//#include <linux/config.h>
++#include <linux/kernel.h>
++#include <linux/module.h>
++#include <linux/init.h>
++#include <linux/ioport.h>
++#include <linux/delay.h>
++#include <linux/i2c.h>
++#include <linux/i2c-algo-bit.h>
++#include <asm/io.h>
++#include <mach/hardware.h>
++
++//1/(2*clockfrequency)
++#define EE_DELAY_USEC 50
++#define GPIOG_EECLK 1
++#define GPIOG_EEDAT 2
++
++/* ----- I2C algorithm call-back functions and structures ----------------- */
++
++// TODO: optimize
++static void ep93xx_setscl(void *data, int state)
++{
++ unsigned int uiPGDR, uiPGDDR;
++
++ uiPGDR = inl(GPIO_PGDR);
++ uiPGDDR = inl(GPIO_PGDDR);
++
++ /* Configure the clock line as output. */
++ uiPGDDR |= GPIOG_EECLK;
++ outl(uiPGDDR, GPIO_PGDDR);
++
++ /* Set clock line to state */
++ if(state)
++ uiPGDR |= GPIOG_EECLK;
++ else
++ uiPGDR &= ~GPIOG_EECLK;
++
++ outl(uiPGDR, GPIO_PGDR);
++}
++
++static void ep93xx_setsda(void *data, int state)
++{
++ unsigned int uiPGDR, uiPGDDR;
++
++ uiPGDR = inl(GPIO_PGDR);
++ uiPGDDR = inl(GPIO_PGDDR);
++
++ /* Configure the data line as output. */
++ uiPGDDR |= GPIOG_EEDAT;
++ outl(uiPGDDR, GPIO_PGDDR);
++
++ /* Set data line to state */
++ if(state)
++ uiPGDR |= GPIOG_EEDAT;
++ else
++ uiPGDR &= ~GPIOG_EEDAT;
++
++ outl(uiPGDR, GPIO_PGDR);
++}
++
++static int ep93xx_getscl(void *data)
++{
++ unsigned int uiPGDR, uiPGDDR;
++
++ uiPGDR = inl(GPIO_PGDR);
++ uiPGDDR = inl(GPIO_PGDDR);
++
++ /* Configure the clock line as input */
++ uiPGDDR &= ~GPIOG_EECLK;
++ outl(uiPGDDR, GPIO_PGDDR);
++
++ /* Return state of the clock line */
++ return (inl(GPIO_PGDR) & GPIOG_EECLK) ? 1 : 0;
++}
++
++static int ep93xx_getsda(void *data)
++{
++ unsigned int uiPGDR, uiPGDDR;
++ uiPGDR = inl(GPIO_PGDR);
++ uiPGDDR = inl(GPIO_PGDDR);
++
++ /* Configure the data line as input */
++ uiPGDDR &= ~GPIOG_EEDAT;
++ outl(uiPGDDR, GPIO_PGDDR);
++
++ /* Return state of the data line */
++ return (inl(GPIO_PGDR) & GPIOG_EEDAT) ? 1 : 0;
++}
++
++/* ------------------------------------------------------------------------
++ * Encapsulate the above functions in the correct operations structure.
++ * This is only done when more than one hardware adapter is supported.
++ */
++
++/* last line (us, ms, timeout)
++ * us dominates the bit rate: 10us means: 100Kbit/sec(25 means 40kbps)
++ * 10ms not known
++ * 100ms timeout
++ */
++static struct i2c_algo_bit_data ep93xx_data = {
++ .setsda = ep93xx_setsda,
++ .setscl = ep93xx_setscl,
++ .getsda = ep93xx_getsda,
++ .getscl = ep93xx_getscl,
++ .udelay = 10,
++ //.mdelay = 10,
++ .timeout = HZ,
++};
++
++/* ----- I2c structure ---------------------------------------------------- */
++static struct i2c_adapter ep93xx_adapter = {
++ .owner = THIS_MODULE,
++ .class = I2C_CLASS_HWMON,
++ .algo_data = &ep93xx_data,
++ .name = "EP93XX I2C bit-bang interface",
++};
++
++/* ----- Module loading, unloading and information ------------------------ */
++
++static int __init i2c_ep93xx_init(void)
++{
++ unsigned long uiPGDR, uiPGDDR;
++
++ /* Read the current value of the GPIO data and data direction registers. */
++ uiPGDR = inl(GPIO_PGDR);
++ uiPGDDR = inl(GPIO_PGDDR);
++
++ /* If the GPIO pins have not been configured since reset, the data
++ * and clock lines will be set as inputs and with data value of 0.
++ * External pullup resisters are pulling them high.
++ * Set them both high before configuring them as outputs. */
++ uiPGDR |= (GPIOG_EEDAT | GPIOG_EECLK);
++ outl(uiPGDR, GPIO_PGDR);
++
++ /* Delay to meet the EE Interface timing specification. */
++ udelay(EE_DELAY_USEC);
++
++
++ /* Configure the EE data and clock lines as outputs. */
++ uiPGDDR |= (GPIOG_EEDAT | GPIOG_EECLK);
++ outl(uiPGDDR, GPIO_PGDDR);
++
++ /* Delay to meet the EE Interface timing specification. */
++ udelay(EE_DELAY_USEC);
++
++ /* Reset hardware to a sane state (SCL and SDA high) */
++ ep93xx_setsda(NULL, 1);
++ ep93xx_setscl(NULL, 1);
++
++ if (i2c_bit_add_bus(&ep93xx_adapter) > 0) {
++ printk(KERN_ERR "i2c-ep93xx: Unable to register with I2C\n");
++ return -ENODEV;
++ }
++
++ return 0;
++}
++
++static void __exit i2c_ep93xx_exit(void)
++{
++ //i2c_bit_del_bus(&ep93xx_adapter);
++ i2c_del_adapter(&ep93xx_adapter);
++}
++
++MODULE_AUTHOR("Michael Burian");
++MODULE_DESCRIPTION("I2C bus glue for Cirrus EP93xx processors");
++MODULE_LICENSE("GPL");
++
++module_init(i2c_ep93xx_init);
++module_exit(i2c_ep93xx_exit);
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