/*   -------------------------------------------------------------------------   i2c-adap-ite.c i2c-hw access for the IIC peripheral on the ITE MIPS system   -------------------------------------------------------------------------   Hai-Pao Fan, MontaVista Software, Inc.   hpfan@mvista.com or source@mvista.com   Copyright 2001 MontaVista Software Inc.   ----------------------------------------------------------------------------   This file was highly leveraged from i2c-elektor.c, which was created   by Simon G. Vogl and Hans Berglund:      Copyright (C) 1995-97 Simon G. Vogl                   1998-99 Hans Berglund    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鰏ti M鋖kki <kmalkki@cc.hut.fi> and even   Frodo Looijaard <frodol@dds.nl> */#include <linux/kernel.h>#include <linux/ioport.h>#include <linux/module.h>#include <linux/delay.h>#include <linux/slab.h>#include <linux/version.h>#include <linux/init.h>#include <asm/irq.h>#include <asm/io.h>#include <linux/i2c.h>#include <linux/i2c-algo-ite.h>#include <linux/i2c-adap-ite.h>#include "i2c-ite.h"#define DEFAULT_BASE  0x14014030#define ITE_IIC_IO_SIZE	0x40#define DEFAULT_IRQ   0#define DEFAULT_CLOCK 0x1b0e	/* default 16MHz/(27+14) = 400KHz */#define DEFAULT_OWN   0x55static int base  = 0;static int irq   = 0;static int clock = 0;static int own   = 0;static int i2c_debug=0;static struct iic_ite gpi;#if (LINUX_VERSION_CODE < 0x020301)static struct wait_queue *iic_wait = NULL;#elsestatic wait_queue_head_t iic_wait;#endifstatic int iic_pending;/* ----- global defines -----------------------------------------------	*/#define DEB(x)	if (i2c_debug>=1) x#define DEB2(x) if (i2c_debug>=2) x#define DEB3(x) if (i2c_debug>=3) x#define DEBE(x)	x	/* error messages 				*//* ----- local functions ----------------------------------------------	*/static void iic_ite_setiic(void *data, int ctl, short val){        unsigned long j = jiffies + 10;	DEB3(printk(" Write 0x%02x to 0x%x\n",(unsigned short)val, ctl&0xff));	DEB3({while (jiffies < j) schedule();}) 	outw(val,ctl);}static short iic_ite_getiic(void *data, int ctl){	short val;	val = inw(ctl);	DEB3(printk("Read 0x%02x from 0x%x\n",(unsigned short)val, ctl&0xff));  	return (val);}/* Return our slave address.  This is the address * put on the I2C bus when another master on the bus wants to address us * as a slave */static int iic_ite_getown(void *data){	return (gpi.iic_own);}static int iic_ite_getclock(void *data){	return (gpi.iic_clock);}#if 0static void iic_ite_sleep(unsigned long timeout){	schedule_timeout( timeout * HZ);}#endif/* Put this process to sleep.  We will wake up when the * IIC controller interrupts. */static void iic_ite_waitforpin(void) {   int timeout = 2;   /* If interrupts are enabled (which they are), then put the process to    * sleep.  This process will be awakened by two events -- either the    * the IIC peripheral interrupts or the timeout expires.     * If interrupts are not enabled then delay for a reasonable amount     * of time and return.    */   if (gpi.iic_irq > 0) {	cli();	if (iic_pending == 0) {		interruptible_sleep_on_timeout(&iic_wait, timeout*HZ );	} else		iic_pending = 0;	sti();   } else {      udelay(100);   }}static void iic_ite_handler(int this_irq, void *dev_id, struct pt_regs *regs) {	   iic_pending = 1;   DEB2(printk("iic_ite_handler: in interrupt handler\n"));   wake_up_interruptible(&iic_wait);}/* Lock the region of memory where I/O registers exist.  Request our * interrupt line and register its associated handler. */static int iic_hw_resrc_init(void){  	if (check_region(gpi.iic_base, ITE_IIC_IO_SIZE) < 0 ) {   	   return -ENODEV;  	} else {  	   request_region(gpi.iic_base, ITE_IIC_IO_SIZE, 		"i2c (i2c bus adapter)");  	}	if (gpi.iic_irq > 0) {	   if (request_irq(gpi.iic_irq, iic_ite_handler, 0, "ITE IIC", 0) < 0) {	      gpi.iic_irq = 0;	   } else	      DEB3(printk("Enabled IIC IRQ %d\n", gpi.iic_irq));	      enable_irq(gpi.iic_irq);	}	return 0;}static void iic_ite_release(void){	if (gpi.iic_irq > 0) {		disable_irq(gpi.iic_irq);		free_irq(gpi.iic_irq, 0);	}	release_region(gpi.iic_base , 2);}static int iic_ite_reg(struct i2c_client *client){	return 0;}static int iic_ite_unreg(struct i2c_client *client){	return 0;}static void iic_ite_inc_use(struct i2c_adapter *adap){#ifdef MODULE	MOD_INC_USE_COUNT;#endif}static void iic_ite_dec_use(struct i2c_adapter *adap){#ifdef MODULE	MOD_DEC_USE_COUNT;#endif}/* ------------------------------------------------------------------------ * Encapsulate the above functions in the correct operations structure. * This is only done when more than one hardware adapter is supported. */static struct i2c_algo_iic_data iic_ite_data = {	NULL,	iic_ite_setiic,	iic_ite_getiic,	iic_ite_getown,	iic_ite_getclock,	iic_ite_waitforpin,	80, 80, 100,		/*	waits, timeout */};static struct i2c_adapter iic_ite_ops = {	"ITE IIC adapter",	I2C_HW_I_IIC,	NULL,	&iic_ite_data,	iic_ite_inc_use,	iic_ite_dec_use,	iic_ite_reg,	iic_ite_unreg,};/* Called when the module is loaded.  This function starts the * cascade of calls up through the heirarchy of i2c modules (i.e. up to the *  algorithm layer and into to the core layer) */static int __init iic_ite_init(void) {	struct iic_ite *piic = &gpi;	printk(KERN_INFO "Initialize ITE IIC adapter module\n");	if (base == 0)		piic->iic_base = DEFAULT_BASE;	else		piic->iic_base = base;	if (irq == 0)		piic->iic_irq = DEFAULT_IRQ;	else		piic->iic_irq = irq;	if (clock == 0)		piic->iic_clock = DEFAULT_CLOCK;	else		piic->iic_clock = clock;	if (own == 0)		piic->iic_own = DEFAULT_OWN;	else		piic->iic_own = own;	iic_ite_data.data = (void *)piic;#if (LINUX_VERSION_CODE >= 0x020301)	init_waitqueue_head(&iic_wait);#endif	if (iic_hw_resrc_init() == 0) {		if (i2c_iic_add_bus(&iic_ite_ops) < 0)			return -ENODEV;	} else {		return -ENODEV;	}	printk(KERN_INFO " found device at %#x irq %d.\n", 		piic->iic_base, piic->iic_irq);	return 0;}static void iic_ite_exit(void){	i2c_iic_del_bus(&iic_ite_ops);        iic_ite_release();}EXPORT_NO_SYMBOLS;/* If modules is NOT defined when this file is compiled, then the MODULE_* * macros will resolve to nothing */MODULE_AUTHOR("MontaVista Software <www.mvista.com>");MODULE_DESCRIPTION("I2C-Bus adapter routines for ITE IIC bus adapter");MODULE_LICENSE("GPL");MODULE_PARM(base, "i");MODULE_PARM(irq, "i");MODULE_PARM(clock, "i");MODULE_PARM(own, "i");MODULE_PARM(i2c_debug,"i");/* Called when module is loaded or when kernel is intialized. * If MODULES is defined when this file is compiled, then this function will * resolve to init_module (the function called when insmod is invoked for a * module).  Otherwise, this function is called early in the boot, when the * kernel is intialized.  Check out /include/init.h to see how this works. */module_init(iic_ite_init);/* Resolves to module_cleanup when MODULES is defined. */module_exit(iic_ite_exit);