420 lines
9.8 KiB
C
420 lines
9.8 KiB
C
/*
|
|
* 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/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) && (*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)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int ite_gpio_release(struct inode *inode, struct file *file)
|
|
{
|
|
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 const struct file_operations ite_gpio_fops = {
|
|
.owner = THIS_MODULE,
|
|
.ioctl = ite_gpio_ioctl,
|
|
.open = ite_gpio_open,
|
|
.release = ite_gpio_release,
|
|
};
|
|
|
|
static struct miscdevice ite_gpio_miscdev = {
|
|
MISC_DYNAMIC_MINOR,
|
|
"ite_gpio",
|
|
&ite_gpio_fops
|
|
};
|
|
|
|
int __init ite_gpio_init(void)
|
|
{
|
|
int i;
|
|
|
|
if (misc_register(&ite_gpio_miscdev))
|
|
return -ENODEV;
|
|
|
|
if (!request_region(ite_gpio_base, 0x1c, "ITE GPIO"))
|
|
{
|
|
misc_deregister(&ite_gpio_miscdev);
|
|
return -EIO;
|
|
}
|
|
|
|
/* 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, IRQF_SHARED, "gpio", 0) < 0) {
|
|
misc_deregister(&ite_gpio_miscdev);
|
|
release_region(ite_gpio_base, 0x1c);
|
|
return 0;
|
|
}
|
|
|
|
printk("GPIO at 0x%x (irq = %d)\n", ite_gpio_base, ite_gpio_irq);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit ite_gpio_exit(void)
|
|
{
|
|
misc_deregister(&ite_gpio_miscdev);
|
|
}
|
|
|
|
module_init(ite_gpio_init);
|
|
module_exit(ite_gpio_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|