Port the i2c-gpio driver to the 2.6 kernel

SVN-Revision: 5916

1 files changed, 456 insertions, 0 deletions

diff --git a/target/linux/au1000-2.6/patches/010-au100_gpio_i2c.patch b/target/linux/au1000-2.6/patches/010-au100_gpio_i2c.patch
new file mode 100644
index 0000000..aeb021a
--- /dev/null
+++ b/target/linux/au1000-2.6/patches/010-au100_gpio_i2c.patch
@@ -0,0 +1,456 @@
+diff -urN linux-2.6.19/drivers/i2c/busses/Kconfig linux-2.6.19.new/drivers/i2c/busses/Kconfig
+--- linux-2.6.19/drivers/i2c/busses/Kconfig	2006-11-29 22:57:37.000000000 +0100
++++ linux-2.6.19.new/drivers/i2c/busses/Kconfig	2006-12-28 17:04:34.000000000 +0100
+@@ -84,6 +84,16 @@
+ 	  This driver can also be built as a module.  If so, the module
+ 	  will be called i2c-au1550.
+ 
++config I2C_AU1X00GPIO
++	tristate "Au1x00 i2c using GPIO pins"
++	depends on I2C && MTX1
++	help
++	  If you say yest to this option, support will be included for the
++	  Au1x00 GPIO interface.
++
++	  This driver can also be built as a module. If so, the module
++	  will be called i2c-au1x00gpio.
++
+ config I2C_ELEKTOR
+ 	tristate "Elektor ISA card"
+ 	depends on I2C && ISA && BROKEN_ON_SMP
+diff -urN linux-2.6.19/drivers/i2c/busses/Makefile linux-2.6.19.new/drivers/i2c/busses/Makefile
+--- linux-2.6.19/drivers/i2c/busses/Makefile	2006-11-29 22:57:37.000000000 +0100
++++ linux-2.6.19.new/drivers/i2c/busses/Makefile	2006-12-28 03:07:37.000000000 +0100
+@@ -9,6 +9,7 @@
+ obj-$(CONFIG_I2C_AMD756_S4882)	+= i2c-amd756-s4882.o
+ obj-$(CONFIG_I2C_AMD8111)	+= i2c-amd8111.o
+ obj-$(CONFIG_I2C_AU1550)	+= i2c-au1550.o
++obj-$(CONFIG_I2C_AU1X00GPIO)	+= i2c-au1x00gpio.o
+ obj-$(CONFIG_I2C_ELEKTOR)	+= i2c-elektor.o
+ obj-$(CONFIG_I2C_HYDRA)		+= i2c-hydra.o
+ obj-$(CONFIG_I2C_I801)		+= i2c-i801.o
+diff -urN linux-2.6.19/drivers/i2c/busses/i2c-au1x00gpio.c linux-2.6.19.new/drivers/i2c/busses/i2c-au1x00gpio.c
+--- linux-2.6.19/drivers/i2c/busses/i2c-au1x00gpio.c	1970-01-01 01:00:00.000000000 +0100
++++ linux-2.6.19.new/drivers/i2c/busses/i2c-au1x00gpio.c	2006-12-28 17:02:10.000000000 +0100
+@@ -0,0 +1,421 @@
++/* ------------------------------------------------------------------------- */
++/* i2c-au1x00gpio.c i2c-hw access for Au1x00 GPIO pins.                      */
++/* ------------------------------------------------------------------------- */
++/*   Copyright (C) 1995-2000 Michael Stickel
++
++    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.		     */
++/* ------------------------------------------------------------------------- */ 
++
++/* With some changes from Ky�stialkki <kmalkki@cc.hut.fi> and even
++   Frodo Looijaard <frodol@dds.nl>
++   Simon G. Vogl
++*/
++
++/* $Id: i2c-au1x00gpio.c,v 1.1.1.2 2004/01/22 15:35:47 br1 Exp $ */
++
++#include <linux/module.h>
++#include <linux/types.h>
++#include <linux/kernel.h>
++#include <linux/init.h>
++#include <linux/stddef.h>
++#include <linux/ioport.h>
++#include <asm/uaccess.h>
++#include <asm/io.h>
++#include <asm-mips/mach-au1x00/au1000.h>
++#include <asm-mips/mach-au1x00/au1000_gpio.h>
++
++#include <linux/slab.h>
++#include <linux/mm.h>
++
++#include <linux/i2c.h>
++#include <linux/i2c-algo-bit.h>
++
++#ifndef __exit
++#define __exit __init
++#endif
++
++
++struct i2c_au1x00gpio
++{
++	struct i2c_au1x00gpio *next;
++
++	short  scl_gpio;
++	short  sda_gpio;
++
++	unsigned long scl_mask;
++	unsigned long sda_mask;
++
++	struct i2c_adapter adapter;
++	struct i2c_algo_bit_data bit_au1x00gpio_data;
++};
++
++static struct i2c_au1x00gpio *adapter_list;
++
++
++
++/* ----- global defines -----------------------------------------------	*/
++#define DEB(x)		/* should be reasonable open, close &c. 	*/
++#define DEB2(x) 	/* low level debugging - very slow 		*/
++#define DEBE(x)	x	/* error messages 				*/
++
++/* ----- printer port defines ------------------------------------------*/
++
++/* ----- local functions ----------------------------------------------	*/
++
++
++//-- Primary GPIO
++static void bit_au1x00gpio_setscl(void *data, int state)
++{
++  struct i2c_au1x00gpio * adapter = (struct i2c_au1x00gpio *)data;
++  if (state)
++    au_writel(adapter->scl_mask, SYS_TRIOUTCLR); // Disable Driver: Switch off Transistor => 1
++  else
++    au_writel(adapter->scl_mask, SYS_OUTPUTCLR); // Clear Output and switch on Transistor => 0
++}
++
++
++static void bit_au1x00gpio_setsda(void *data, int state)
++{
++  struct i2c_au1x00gpio * adapter = (struct i2c_au1x00gpio *)data;
++  if (state)
++    au_writel(adapter->sda_mask, SYS_TRIOUTCLR);
++  else
++    au_writel(adapter->sda_mask, SYS_OUTPUTCLR);
++}
++
++
++static int bit_au1x00gpio_getscl(void *data)
++{
++  struct i2c_au1x00gpio * adapter = (struct i2c_au1x00gpio *)data;
++  return (au_readl(SYS_PINSTATERD) & adapter->scl_mask) ? 1 : 0;
++}
++
++
++static int bit_au1x00gpio_getsda(void *data)
++{
++  struct i2c_au1x00gpio * adapter = (struct i2c_au1x00gpio *)data;
++  return (au_readl(SYS_PINSTATERD) & adapter->sda_mask) ? 1 : 0;
++}
++
++
++
++
++/*--
++ *-- Functions for accessing GPIO-2
++ *--
++ */
++static void bit_au1x00gpio2_setscl(void *data, int state)
++{
++  struct i2c_au1x00gpio * adapter = (struct i2c_au1x00gpio *)data;
++  if (state)
++    {
++      au_writel(au_readl(GPIO2_DIR) & ~adapter->scl_mask, GPIO2_DIR);
++    }
++  else
++    {
++      au_writel(au_readl(GPIO2_OUTPUT) & ~adapter->scl_mask, GPIO2_OUTPUT);
++      au_writel(au_readl(GPIO2_DIR) | adapter->scl_mask, GPIO2_DIR);
++    }
++}
++
++static void bit_au1x00gpio2_setsda(void *data, int state)
++{
++  struct i2c_au1x00gpio * adapter = (struct i2c_au1x00gpio *)data;
++  if (state)
++    {
++      au_writel(au_readl(GPIO2_DIR) & ~adapter->sda_mask, GPIO2_DIR);
++    }
++  else
++    {
++      au_writel(au_readl(GPIO2_OUTPUT) & ~adapter->sda_mask, GPIO2_OUTPUT);
++      au_writel(au_readl(GPIO2_DIR) | adapter->sda_mask, GPIO2_DIR);
++    }
++}
++
++static int bit_au1x00gpio2_getscl(void *data)
++{
++  struct i2c_au1x00gpio * adapter = (struct i2c_au1x00gpio *)data;
++  return (au_readl(GPIO2_PINSTATE) & adapter->scl_mask) ? 1 : 0;
++}
++
++static int bit_au1x00gpio2_getsda(void *data)
++{
++  struct i2c_au1x00gpio * adapter = (struct i2c_au1x00gpio *)data;
++  return (au_readl(GPIO2_PINSTATE) & adapter->sda_mask) ? 1 : 0;
++}
++
++
++
++static int check_i2c_au1x00gpio_adapter(struct i2c_au1x00gpio *adapter)
++{
++  int state = 0;
++
++  adapter->bit_au1x00gpio_data.setsda (adapter, 1);
++  adapter->bit_au1x00gpio_data.setscl (adapter, 1);
++
++  if (adapter->bit_au1x00gpio_data.getsda(adapter)==0)
++    {
++      printk ("i2c-au1x00gpio: sda line should read 1 but reads 0\n");
++      state = -1;
++    }
++  if (adapter->bit_au1x00gpio_data.getscl(adapter)==0)
++    {
++      printk ("i2c-au1x00gpio: scl line should read 1 but reads 0\n");
++      state = -1;
++    }
++
++
++  adapter->bit_au1x00gpio_data.setsda (adapter, 0);
++  adapter->bit_au1x00gpio_data.setscl (adapter, 0);
++
++  if (adapter->bit_au1x00gpio_data.getsda(adapter)==1)
++    {
++      printk ("i2c-au1x00gpio: sda line should read 0 but reads 1\n");
++      state = -1;
++    }
++  if (adapter->bit_au1x00gpio_data.getscl(adapter)==1)
++    {
++      printk ("i2c-au1x00gpio: scl line should read 0 but reads 1\n");
++      state = -1;
++    }
++
++  if (state==0)
++    printk ("i2c-au1x00gpio: adapter with scl=GPIO%d,sda=GPIO%d is working\n",
++	    adapter->scl_gpio, adapter->sda_gpio
++	    );
++  return state;
++}
++
++
++
++#if 0
++static int bit_au1x00gpio_reg(struct i2c_client *client)
++{
++	return 0;
++}
++
++static int bit_au1x00gpio_unreg(struct i2c_client *client)
++{
++	return 0;
++}
++
++static void bit_au1x00gpio_inc_use(struct i2c_adapter *adap)
++{
++	MOD_INC_USE_COUNT;
++}
++
++static void bit_au1x00gpio_dec_use(struct i2c_adapter *adap)
++{
++	MOD_DEC_USE_COUNT;
++}
++#endif
++ 
++
++
++static struct i2c_algo_bit_data bit_au1x00gpio_data = {
++	.data = NULL,
++	.setsda = bit_au1x00gpio_setsda,
++	.setscl = bit_au1x00gpio_setscl,
++	.getsda = bit_au1x00gpio_getsda,
++	.getscl = bit_au1x00gpio_getscl,
++	.udelay = 80,
++	.timeout = HZ,
++}; 
++
++
++static struct i2c_adapter bit_au1x00gpio_ops = {
++        .owner          = THIS_MODULE,
++        .name           = "Au1x00 GPIO I2C adapter",
++        .id             = I2C_HW_B_AU1x00GPIO,
++};
++
++
++
++/*
++ * scl_gpio:
++ *   0..31 for primary GPIO's
++ *   200..215 for secondary GPIO's
++ *
++ * sda_gpio:
++ *   0..31 for primary GPIO's
++ *   200..215 for secondary GPIO's
++ *
++ * You can even mix primary and secondary GPIO's.
++ * E.g.:  i2c_au1x00gpio_create(4,206);
++ */
++
++static int i2c_au1x00gpio_create (int scl_gpio, int sda_gpio)
++{
++  if ((scl_gpio < 32 || (scl_gpio >= 200 && scl_gpio <= 215)) &&
++      (scl_gpio < 32 || (scl_gpio >= 200 && scl_gpio <= 215)))
++    {
++	struct i2c_au1x00gpio *adapter = kmalloc(sizeof(struct i2c_au1x00gpio),
++					  GFP_KERNEL);
++	if (!adapter) {
++		printk(KERN_ERR "i2c-au1x00-gpio: Unable to malloc.\n");
++		return -1;
++	}
++
++	printk(KERN_DEBUG "i2c-au1x00-gpio.o: attaching to SCL=GPIO%d, SDA=GPIO%d\n",
++	       scl_gpio, sda_gpio);
++
++	memset (adapter, 0, sizeof(struct i2c_au1x00gpio));
++
++	adapter->adapter = bit_au1x00gpio_ops;
++
++	adapter->adapter.algo_data = &adapter->bit_au1x00gpio_data;
++	adapter->bit_au1x00gpio_data = bit_au1x00gpio_data;
++	adapter->bit_au1x00gpio_data.data = adapter;
++
++	adapter->bit_au1x00gpio_data.data = adapter;
++
++	adapter->scl_gpio = scl_gpio;
++	adapter->sda_gpio = sda_gpio;
++
++        if (sda_gpio < 32)
++          {
++	    adapter->bit_au1x00gpio_data.setsda = bit_au1x00gpio_setsda;
++	    adapter->bit_au1x00gpio_data.getsda = bit_au1x00gpio_getsda;
++            adapter->sda_mask = 1<<sda_gpio;
++          }
++        else if (sda_gpio >= 200 && sda_gpio <= 215)
++          {
++	    adapter->bit_au1x00gpio_data.setsda = bit_au1x00gpio2_setsda;
++	    adapter->bit_au1x00gpio_data.getsda = bit_au1x00gpio2_getsda;
++            adapter->sda_mask = 1<<(sda_gpio-200);
++          }
++
++
++        if (scl_gpio < 32)
++          {
++	    adapter->bit_au1x00gpio_data.setscl = bit_au1x00gpio_setscl;
++	    adapter->bit_au1x00gpio_data.getscl = bit_au1x00gpio_getscl;
++            adapter->scl_mask = 1<<scl_gpio;
++          }
++        else if (scl_gpio >= 200 && scl_gpio <= 215)
++          {
++ 	    adapter->bit_au1x00gpio_data.setscl = bit_au1x00gpio2_setscl;
++	    adapter->bit_au1x00gpio_data.getscl = bit_au1x00gpio2_getscl;
++            adapter->scl_mask = 1<<(scl_gpio-200);
++          }
++
++	au_writel(0L, SYS_PININPUTEN);
++	if (check_i2c_au1x00gpio_adapter(adapter)==0)
++	  {
++	    adapter->bit_au1x00gpio_data.setsda (adapter, 1);
++	    adapter->bit_au1x00gpio_data.setscl (adapter, 1);
++
++	    if (i2c_bit_add_bus(&adapter->adapter) < 0)
++	      {
++		printk(KERN_ERR "i2c-au1x00-gpio: Unable to register with I2C.\n");
++		kfree(adapter);
++		return -1;		/* No good */
++	      }
++	    
++	    adapter->next = adapter_list;
++	    adapter_list = adapter;
++	    return 0;
++	  }
++    }
++  else
++    printk(KERN_ERR "i2c-au1x00-gpio: Invalid argument scl_gpio=%d, sda_gpio=%d.\n", scl_gpio, sda_gpio);
++  return -1;
++}
++
++
++
++static void i2c_au1x00gpio_delete (int scl_gpio, int sda_gpio)
++{
++	struct i2c_au1x00gpio *adapter, *prev = NULL;
++
++	for (adapter = adapter_list; adapter; adapter = adapter->next)
++	{
++		if (adapter->scl_gpio == scl_gpio &&
++		    adapter->sda_gpio == sda_gpio)
++		{
++			i2c_bit_del_bus(&adapter->adapter);
++			if (prev)
++				prev->next = adapter->next;
++			else
++				adapter_list = adapter->next;
++			kfree(adapter);
++			return;
++		}
++		prev = adapter;
++	}
++}
++
++
++
++
++
++#ifndef CONFIG_I2C_AU1X00GPIO_SCL
++#define CONFIG_I2C_AU1X00GPIO_SCL (216)
++#endif
++
++#ifndef CONFIG_I2C_AU1X00GPIO_SDA
++#define CONFIG_I2C_AU1X00GPIO_SDA (217)
++#endif
++
++static int au1x00gpiopin_scl = CONFIG_I2C_AU1X00GPIO_SCL;
++static int au1x00gpiopin_sda = CONFIG_I2C_AU1X00GPIO_SDA;
++
++
++
++int __init i2c_bit_au1x00gpio_init(void)
++{
++  printk(KERN_INFO "i2c-au1x00gpio.o: i2c Au1x00 GPIO adapter module version\n");
++
++  if (i2c_au1x00gpio_create (au1x00gpiopin_scl, au1x00gpiopin_sda) == 0)
++    {
++      printk(KERN_INFO "i2c-au1x00gpio.o: registered I2C-Bus for GPIO%d,GPIO%d\n",
++            au1x00gpiopin_scl, au1x00gpiopin_sda
++            );
++      return 0;
++    }
++  printk(KERN_INFO "i2c-au1x00gpio.o: failed to register I2C-Bus for GPIO%d,GPIO%d\n",
++            au1x00gpiopin_scl, au1x00gpiopin_sda
++        );
++  return -1;
++}
++
++
++void __exit i2c_bit_au1x00gpio_exit(void)
++{
++  i2c_au1x00gpio_delete (au1x00gpiopin_scl, au1x00gpiopin_sda);
++}
++
++module_param(au1x00gpiopin_scl, int, 0644);
++MODULE_PARM_DESC(au1x00gpiopin_scl, "GPIO pin number used for SCL pin.");
++
++module_param(au1x00gpiopin_sda, int, 0644);
++MODULE_PARM_DESC(au1x00gpiopin_sda, "GPIO pin number used for SDA pin.");
++
++MODULE_AUTHOR("Michael Stickel <michael@cubic.org>");
++MODULE_DESCRIPTION("I2C-Bus adapter routines for Au1x00 GPIO adapter.");
++MODULE_LICENSE("GPL");
++
++
++#ifdef MODULE
++int init_module(void)
++{
++	return i2c_bit_au1x00gpio_init();
++}
++
++void cleanup_module(void)
++{
++	i2c_bit_au1x00gpio_exit();
++}
++#endif