diff options
Diffstat (limited to 'target/linux/ep93xx/patches-2.6.30/003-ep93xx-i2c.patch')
| -rw-r--r-- | target/linux/ep93xx/patches-2.6.30/003-ep93xx-i2c.patch | 225 |
1 files changed, 225 insertions, 0 deletions
diff --git a/target/linux/ep93xx/patches-2.6.30/003-ep93xx-i2c.patch b/target/linux/ep93xx/patches-2.6.30/003-ep93xx-i2c.patch new file mode 100644 index 0000000..aaf4d3c --- /dev/null +++ b/target/linux/ep93xx/patches-2.6.30/003-ep93xx-i2c.patch @@ -0,0 +1,225 @@ +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); |