diff options
Diffstat (limited to 'drivers/char/ite_gpio.c')
| -rw-r--r-- | drivers/char/ite_gpio.c | 419 |
1 files changed, 419 insertions, 0 deletions
diff --git a/drivers/char/ite_gpio.c b/drivers/char/ite_gpio.c new file mode 100644 index 000000000000..d1ed6ac950d1 --- /dev/null +++ b/drivers/char/ite_gpio.c @@ -0,0 +1,419 @@ +/* + * 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 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, SA_SHIRQ, "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"); |