Viewing file:  ite_gpio.c (9.97 KB) -rw-r--r--
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/*
* FILE NAME ite_gpio.c
*
* BRIEF MODULE DESCRIPTION
* API for ITE GPIO device.
* Driver for ITE GPIO device.
*
* Author: MontaVista Software, Inc. <source@mvista.com>
* Hai-Pao Fan <haipao@mvista.com>
*
* Copyright 2001 MontaVista Software Inc.
*
* 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 SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* 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/module.h>
#include <linux/config.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/miscdevice.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <asm/uaccess.h>
#include <asm/addrspace.h>
#include <asm/it8172/it8172_int.h>
#include <linux/sched.h>
#include <linux/ite_gpio.h>
#define ite_gpio_base 0x14013800
#define ITE_GPADR (*(volatile __u8 *)(0x14013800 + KSEG1))
#define ITE_GPBDR (*(volatile __u8 *)(0x14013808 + KSEG1))
#define ITE_GPCDR (*(volatile __u8 *)(0x14013810 + KSEG1))
#define ITE_GPACR (*(volatile __u16 *)(0x14013802 + KSEG1))
#define ITE_GPBCR (*(volatile __u16 *)(0x1401380a + KSEG1))
#define ITE_GPCCR (*(volatile __u16 *)(0x14013812 + KSEG1))
#define ITE_GPAICR (*(volatile __u16 *)(0x14013804 + KSEG1))
#define ITE_GPBICR (*(volatile __u16 *)(0x1401380c + KSEG1))
#define ITE_GPCICR (*(volatile __u16 *)(0x14013814 + KSEG1))
#define ITE_GPAISR (*(volatile __u8 *)(0x14013806 + KSEG1))
#define ITE_GPBISR (*(volatile __u8 *)(0x1401380e + KSEG1))
#define ITE_GPCISR (*(volatile __u8 *)(0x14013816 + KSEG1))
#define ITE_GCR (*(volatile __u8 *)(0x14013818 + KSEG1))
#define MAX_GPIO_LINE 21
static int ite_gpio_irq=IT8172_GPIO_IRQ;
static long ite_irq_counter[MAX_GPIO_LINE];
wait_queue_head_t ite_gpio_wait[MAX_GPIO_LINE];
static int ite_gpio_irq_pending[MAX_GPIO_LINE];
static int ite_gpio_debug=0;
#define DEB(x) if (ite_gpio_debug>=1) x
int ite_gpio_in(__u32 device, __u32 mask, volatile __u32 *data)
{
DEB(printk("ite_gpio_in mask=0x%x\n",mask));
switch (device) {
case ITE_GPIO_PORTA:
ITE_GPACR = (__u16)mask; /* 0xffff */
*data = ITE_GPADR;
break;
case ITE_GPIO_PORTB:
ITE_GPBCR = (__u16)mask; /* 0xffff */
*data = ITE_GPBDR;
break;
case ITE_GPIO_PORTC:
ITE_GPCCR = (__u16)mask; /* 0x03ff */
*data = ITE_GPCDR;
break;
default:
return -EFAULT;
}
return 0;
}
int ite_gpio_out(__u32 device, __u32 mask, __u32 data)
{
switch (device) {
case ITE_GPIO_PORTA:
ITE_GPACR = (__u16)mask; /* 0x5555 */
ITE_GPADR = (__u8)data;
break;
case ITE_GPIO_PORTB:
ITE_GPBCR = (__u16)mask; /* 0x5555 */
ITE_GPBDR = (__u8)data;
break;
case ITE_GPIO_PORTC:
ITE_GPCCR = (__u16)mask; /* 0x0155 */
ITE_GPCDR = (__u8)data;
break;
default:
return -EFAULT;
}
return 0;
}
int ite_gpio_int_ctrl(__u32 device, __u32 mask, __u32 data)
{
switch (device) {
case ITE_GPIO_PORTA:
ITE_GPAICR = (ITE_GPAICR & ~mask) | (data & mask);
break;
case ITE_GPIO_PORTB:
ITE_GPBICR = (ITE_GPBICR & ~mask) | (data & mask);
break;
case ITE_GPIO_PORTC:
ITE_GPCICR = (ITE_GPCICR & ~mask) | (data & mask);
break;
default:
return -EFAULT;
}
return 0;
}
int ite_gpio_in_status(__u32 device, __u32 mask, volatile __u32 *data)
{
int ret=-1;
if (MAX_GPIO_LINE > *data >= 0)
ret=ite_gpio_irq_pending[*data];
DEB(printk("ite_gpio_in_status %d ret=%d\n",*data, ret));
switch (device) {
case ITE_GPIO_PORTA:
*data = ITE_GPAISR & mask;
break;
case ITE_GPIO_PORTB:
*data = ITE_GPBISR & mask;
break;
case ITE_GPIO_PORTC:
*data = ITE_GPCISR & mask;
break;
default:
return -EFAULT;
}
return ret;
}
int ite_gpio_out_status(__u32 device, __u32 mask, __u32 data)
{
switch (device) {
case ITE_GPIO_PORTA:
ITE_GPAISR = (ITE_GPAISR & ~mask) | (data & mask);
break;
case ITE_GPIO_PORTB:
ITE_GPBISR = (ITE_GPBISR & ~mask) | (data & mask);
break;
case ITE_GPIO_PORTC:
ITE_GPCISR = (ITE_GPCISR & ~mask) | (data & mask);
break;
default:
return -EFAULT;
}
return 0;
}
int ite_gpio_gen_ctrl(__u32 device, __u32 mask, __u32 data)
{
ITE_GCR = (ITE_GCR & ~mask) | (data & mask);
return 0;
}
int ite_gpio_int_wait (__u32 device, __u32 mask, __u32 data)
{
int i,line=0, ret=0;
unsigned long flags;
switch (device) {
case ITE_GPIO_PORTA:
line = data & mask;
break;
case ITE_GPIO_PORTB:
line = (data & mask) <<8;
break;
case ITE_GPIO_PORTC:
line = (data & mask) <<16;
break;
}
for (i=MAX_GPIO_LINE-1; i >= 0; i--) {
if ( (line) & (1 << i))
break;
}
DEB(printk("wait device=0x%d mask=0x%x data=0x%x index %d\n",
device, mask, data, i));
if (line & ~(1<<i))
return -EFAULT;
if (ite_gpio_irq_pending[i]==1)
return -EFAULT;
save_flags (flags);
cli();
ite_gpio_irq_pending[i] = 1;
ret = interruptible_sleep_on_timeout(&ite_gpio_wait[i], 3*HZ);
restore_flags (flags);
ite_gpio_irq_pending[i] = 0;
return ret;
}
EXPORT_SYMBOL(ite_gpio_in);
EXPORT_SYMBOL(ite_gpio_out);
EXPORT_SYMBOL(ite_gpio_int_ctrl);
EXPORT_SYMBOL(ite_gpio_in_status);
EXPORT_SYMBOL(ite_gpio_out_status);
EXPORT_SYMBOL(ite_gpio_gen_ctrl);
EXPORT_SYMBOL(ite_gpio_int_wait);
static int ite_gpio_open(struct inode *inode, struct file *file)
{
unsigned int minor = MINOR(inode->i_rdev);
if (minor != GPIO_MINOR)
return -ENODEV;
#ifdef MODULE
MOD_INC_USE_COUNT;
#endif
return 0;
}
static int ite_gpio_release(struct inode *inode, struct file *file)
{
#ifdef MODULE
MOD_DEC_USE_COUNT;
#endif
return 0;
}
static int ite_gpio_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
static struct ite_gpio_ioctl_data ioctl_data;
if (copy_from_user(&ioctl_data, (struct ite_gpio_ioctl_data *)arg,
sizeof(ioctl_data)))
return -EFAULT;
if ((ioctl_data.device < ITE_GPIO_PORTA) ||
(ioctl_data.device > ITE_GPIO_PORTC) )
return -EFAULT;
switch(cmd) {
case ITE_GPIO_IN:
if (ite_gpio_in(ioctl_data.device, ioctl_data.mask,
&ioctl_data.data))
return -EFAULT;
if (copy_to_user((struct ite_gpio_ioctl_data *)arg,
&ioctl_data, sizeof(ioctl_data)))
return -EFAULT;
break;
case ITE_GPIO_OUT:
return ite_gpio_out(ioctl_data.device,
ioctl_data.mask, ioctl_data.data);
break;
case ITE_GPIO_INT_CTRL:
return ite_gpio_int_ctrl(ioctl_data.device,
ioctl_data.mask, ioctl_data.data);
break;
case ITE_GPIO_IN_STATUS:
if (ite_gpio_in_status(ioctl_data.device, ioctl_data.mask,
&ioctl_data.data))
return -EFAULT;
if (copy_to_user((struct ite_gpio_ioctl_data *)arg,
&ioctl_data, sizeof(ioctl_data)))
return -EFAULT;
break;
case ITE_GPIO_OUT_STATUS:
return ite_gpio_out_status(ioctl_data.device,
ioctl_data.mask, ioctl_data.data);
break;
case ITE_GPIO_GEN_CTRL:
return ite_gpio_gen_ctrl(ioctl_data.device,
ioctl_data.mask, ioctl_data.data);
break;
case ITE_GPIO_INT_WAIT:
return ite_gpio_int_wait(ioctl_data.device,
ioctl_data.mask, ioctl_data.data);
break;
default:
return -ENOIOCTLCMD;
}
return 0;
}
static void ite_gpio_irq_handler(int this_irq, void *dev_id, struct pt_regs *regs)
{
int i,line;
line = ITE_GPCISR & 0x1f;
for (i=4; i >=0; i--) {
if ( line & (1 << i)) {
++ite_irq_counter[i+16];
ite_gpio_irq_pending[i+16] = 2;
wake_up_interruptible(&ite_gpio_wait[i+16]);
DEB(printk("interrupt 0x%x %d\n", &ite_gpio_wait[i+16], i+16));
ITE_GPCISR = ITE_GPCISR & (1<<i);
return;
}
}
line = ITE_GPBISR;
for (i=7; i >= 0; i--) {
if ( line & (1 << i)) {
++ite_irq_counter[i+8];
ite_gpio_irq_pending[i+8] = 2;
wake_up_interruptible(&ite_gpio_wait[i+8]);
DEB(printk("interrupt 0x%x %d\n",ITE_GPBISR, i+8));
ITE_GPBISR = ITE_GPBISR & (1<<i);
return;
}
}
line = ITE_GPAISR;
for (i=7; i >= 0; i--) {
if ( line & (1 << i)) {
++ite_irq_counter[i];
ite_gpio_irq_pending[i] = 2;
wake_up_interruptible(&ite_gpio_wait[i]);
DEB(printk("interrupt 0x%x %d\n",ITE_GPAISR, i));
ITE_GPAISR = ITE_GPAISR & (1<<i);
return;
}
}
}
static struct file_operations ite_gpio_fops =
{
owner: THIS_MODULE,
ioctl: ite_gpio_ioctl,
open: ite_gpio_open,
release: ite_gpio_release,
};
/* GPIO_MINOR in include/linux/miscdevice.h */
static struct miscdevice ite_gpio_miscdev =
{
GPIO_MINOR,
"ite_gpio",
&ite_gpio_fops
};
int __init ite_gpio_init(void)
{
int i;
misc_register(&ite_gpio_miscdev);
if (check_region(ite_gpio_base, 0x1c) < 0 ) {
return -ENODEV;
} else {
request_region(ite_gpio_base, 0x1c, "ITE GPIO");
}
/* initialize registers */
ITE_GPACR = 0xffff;
ITE_GPBCR = 0xffff;
ITE_GPCCR = 0xffff;
ITE_GPAICR = 0x00ff;
ITE_GPBICR = 0x00ff;
ITE_GPCICR = 0x00ff;
ITE_GCR = 0;
for (i = 0; i < MAX_GPIO_LINE; i++) {
ite_gpio_irq_pending[i]=0;
init_waitqueue_head(&ite_gpio_wait[i]);
}
if (request_irq(ite_gpio_irq, ite_gpio_irq_handler, SA_SHIRQ, "gpio", 0) < 0)
return 0;
printk("GPIO at 0x%x (irq = %d)\n", ite_gpio_base, ite_gpio_irq);
return 0;
}
void __exit ite_gpio_exit(void)
{
misc_deregister(&ite_gpio_miscdev);
}
module_init(ite_gpio_init);
module_exit(ite_gpio_exit);
MODULE_LICENSE("GPL");
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