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/* -------------------------------------------------------------------- */
/* i2c-voyagergx.c: */
/* -------------------------------------------------------------------- */
/* 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.
Copyright 2003 (c) Lineo uSolutions,Inc.
Copyright 2004 (c) Paul Mundt
*/
/* -------------------------------------------------------------------- */
#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 <linux/interrupt.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <linux/i2c.h>
#include "../algos/i2c-algo-voyager.h"
//#define I2C_USE_INTR
#if defined(I2C_USE_INTR)
#define DEFAULT_IRQ 10
#else
#define DEFAULT_IRQ 0
#endif
struct iic_voyagergx {
unsigned long iic_base;
int iic_irq;
};
static struct iic_voyagergx gpi;
static wait_queue_head_t iic_wait;
static int iic_pending;
static void iic_voyagergx_setiic(void *data, int ctl, int val)
{
outw(val,ctl);
}
static int iic_voyagergx_getiic(void *data, int ctl)
{
return inw(ctl);
}
/* Put this process to sleep. We will wake up when the
* IIC controller interrupts.
*/
static void iic_voyagergx_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) {
local_irq_disable();
if (iic_pending == 0) {
interruptible_sleep_on_timeout(&iic_wait, timeout*HZ);
} else {
iic_pending = 0;
}
local_irq_enable();
} else {
udelay(100);
}
}
#if defined(I2C_USE_INTR)
static irqreturn_t iic_voyagergx_handler(int this_irq, void *dev_id,
struct pt_regs *regs)
{
iic_pending = 1;
pr_debug("iic_voyagergx_handler: in interrupt handler\n");
wake_up_interruptible(&iic_wait);
return IRQ_HANDLED;
}
#endif
/* 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)
{
unsigned char ctl;
unsigned long val;
// Power Mode Gate
val = inl(POWER_MODE0_GATE);
val |= 0x00000040;
outl(val, POWER_MODE0_GATE);
val = inl(POWER_MODE1_GATE);
val |= 0x00000040;
outl(val, POWER_MODE1_GATE);
// GPIO Control
val = inl( GPIO_MUX_HIGH);
val |= 0x0000c000;
outl(val, GPIO_MUX_HIGH);
#if defined(I2C_USE_INTR)
// Interrupt Mask
val = inl(VOYAGER_INT_MASK);
val |= 0x00800000;
outl(val, VOYAGER_INT_MASK);
#endif
// Enable I2c controller and select mode to high
ctl = inb(I2C_CONTROL);
outb((ctl | I2C_CONTROL_E | I2C_CONTROL_MODE), I2C_CONTROL);
#if defined(I2C_USE_INTR)
if (gpi.iic_irq > 0) {
if (request_irq(gpi.iic_irq, iic_voyagergx_handler, 0,
"VoyagerGX IIC", 0) < 0) {
gpi.iic_irq = 0;
} else {
pr_debug("Enabled IIC IRQ %d\n", gpi.iic_irq);
}
enable_irq(gpi.iic_irq);
}
#endif
return 0;
}
static struct i2c_algo_iic_data iic_voyagergx_data = {
.setiic = iic_voyagergx_setiic,
.getiic = iic_voyagergx_getiic,
.waitforpin = iic_voyagergx_waitforpin,
.udelay = 80,
.mdelay = 80,
.timeout = 100,
};
static struct i2c_adapter iic_voyagergx_ops = {
.owner = THIS_MODULE,
.name = "VoyagerGX I2C",
.id = I2C_HW_SMBUS_VOYAGER,
.class = I2C_ADAP_CLASS_SMBUS,
.algo_data = &iic_voyagergx_data,
};
static int __init iic_voyagergx_init(void)
{
struct iic_voyagergx *piic = &gpi;
printk(KERN_INFO "Initialize VoyagerGX I2C module\n");
piic->iic_base = VOYAGER_BASE;
piic->iic_irq = DEFAULT_IRQ;
iic_voyagergx_data.data = (void *)piic;
init_waitqueue_head(&iic_wait);
if (iic_hw_resrc_init() == 0) {
if (i2c_voyager_add_bus(&iic_voyagergx_ops) < 0)
return -ENODEV;
} else {
return -ENODEV;
}
#if defined(I2C_USE_INTR)
printk(KERN_INFO " found device at %#lx irq %d.\n",
piic->iic_base, piic->iic_irq);
#else
printk(KERN_INFO " found device at %#lx\n", piic->iic_base);
#endif
return 0;
}
static void iic_voyagergx_exit(void)
{
if (gpi.iic_irq > 0) {
disable_irq(gpi.iic_irq);
free_irq(gpi.iic_irq, 0);
}
release_region(gpi.iic_base, 2);
}
MODULE_AUTHOR("Lineo uSolutions,Inc. <www.lineo.co.jp>");
MODULE_DESCRIPTION("I2C-Bus adapter for VoyagerGX Silicon Motion, Inc.");
MODULE_LICENSE("GPL");
module_init(iic_voyagergx_init);
module_exit(iic_voyagergx_exit);
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