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