/* * $Id: gpio.c,v 1.4 2003/05/19 22:24:18 lethal Exp $ * by Greg Banks <gbanks@pocketpenguins.com> * (c) 2000 PocketPenguins Inc * * GPIO pin support for HD64465 companion chip. */#include <linux/kernel.h>#include <linux/init.h>#include <linux/module.h>#include <linux/sched.h>#include <linux/ioport.h>#include <asm/io.h>#include <asm/hd64465/gpio.h>#define _PORTOF(portpin)    (((portpin)>>3)&0x7)#define _PINOF(portpin)     ((portpin)&0x7)/* Register addresses parametrised on port */#define GPIO_CR(port)	    (HD64465_REG_GPACR+((port)<<1))#define GPIO_DR(port)	    (HD64465_REG_GPADR+((port)<<1))#define GPIO_ICR(port)	    (HD64465_REG_GPAICR+((port)<<1))#define GPIO_ISR(port)	    (HD64465_REG_GPAISR+((port)<<1))#define GPIO_NPORTS 5#define MODNAME "hd64465_gpio"EXPORT_SYMBOL(hd64465_gpio_configure);EXPORT_SYMBOL(hd64465_gpio_get_pin);EXPORT_SYMBOL(hd64465_gpio_get_port);EXPORT_SYMBOL(hd64465_gpio_register_irq);EXPORT_SYMBOL(hd64465_gpio_set_pin);EXPORT_SYMBOL(hd64465_gpio_set_port);EXPORT_SYMBOL(hd64465_gpio_unregister_irq);/* TODO: each port should be protected with a spinlock */void hd64465_gpio_configure(int portpin, int direction){    	unsigned short cr;	unsigned int shift = (_PINOF(portpin)<<1);	cr = inw(GPIO_CR(_PORTOF(portpin)));	cr &= ~(3<<shift);	cr |= direction<<shift;	outw(cr, GPIO_CR(_PORTOF(portpin)));}void hd64465_gpio_set_pin(int portpin, unsigned int value){    	unsigned short d;	unsigned short mask = 1<<(_PINOF(portpin));		d = inw(GPIO_DR(_PORTOF(portpin)));	if (value)	    d |= mask;	else	    d &= ~mask;	outw(d, GPIO_DR(_PORTOF(portpin)));}unsigned int hd64465_gpio_get_pin(int portpin){	return inw(GPIO_DR(_PORTOF(portpin))) & (1<<(_PINOF(portpin)));}/* TODO: for cleaner atomicity semantics, add a mask to this routine */void hd64465_gpio_set_port(int port, unsigned int value){	outw(value, GPIO_DR(port));}unsigned int hd64465_gpio_get_port(int port){	return inw(GPIO_DR(port));}static struct {    void (*func)(int portpin, void *dev);    void *dev;} handlers[GPIO_NPORTS * 8];static irqreturn_t hd64465_gpio_interrupt(int irq, void *dev, struct pt_regs *regs){    	unsigned short port, pin, isr, mask, portpin;		for (port=0 ; port<GPIO_NPORTS ; port++) {	    isr = inw(GPIO_ISR(port));	    	    for (pin=0 ; pin<8 ; pin++) {	    	mask = 1<<pin;	    	if (isr & mask) {		    portpin = (port<<3)|pin;		    if (handlers[portpin].func != 0)		    	handlers[portpin].func(portpin, handlers[portpin].dev);    	    	    else		    	printk(KERN_NOTICE "unexpected GPIO interrupt, pin %c%d\n",			    port+'A', (int)pin);		}	    }	    	    /* Write 1s back to ISR to clear it?  That's what the manual says.. */	    outw(isr, GPIO_ISR(port));	}	return IRQ_HANDLED;}void hd64465_gpio_register_irq(int portpin, int mode,	void (*handler)(int portpin, void *dev), void *dev){    	unsigned long flags;	unsigned short icr, mask;	if (handler == 0)	    return;	    	local_irq_save(flags);		handlers[portpin].func = handler;	handlers[portpin].dev = dev;    	/*	 * Configure Interrupt Control Register	 */	icr = inw(GPIO_ICR(_PORTOF(portpin)));	mask = (1<<_PINOF(portpin));		/* unmask interrupt */	icr &= ~mask;		/* set TS bit */	mask <<= 8;	icr &= ~mask;	if (mode == HD64465_GPIO_RISING)	    icr |= mask;	    	outw(icr, GPIO_ICR(_PORTOF(portpin)));	local_irq_restore(flags);}void hd64465_gpio_unregister_irq(int portpin){    	unsigned long flags;	unsigned short icr;		local_irq_save(flags);    	/*	 * Configure Interrupt Control Register	 */	icr = inw(GPIO_ICR(_PORTOF(portpin)));	icr |= (1<<_PINOF(portpin));	/* mask interrupt */	outw(icr, GPIO_ICR(_PORTOF(portpin)));	handlers[portpin].func = 0;	handlers[portpin].dev = 0;		local_irq_restore(flags);}static int __init hd64465_gpio_init(void){	if (!request_region(HD64465_REG_GPACR, 0x1000, MODNAME))		return -EBUSY;	if (request_irq(HD64465_IRQ_GPIO, hd64465_gpio_interrupt,	    		SA_INTERRUPT, MODNAME, 0))		goto out_irqfailed;    	printk("HD64465 GPIO layer on irq %d\n", HD64465_IRQ_GPIO);	return 0;out_irqfailed:	release_region(HD64465_REG_GPACR, 0x1000);	return -EINVAL;}static void __exit hd64465_gpio_exit(void){    	release_region(HD64465_REG_GPACR, 0x1000);	free_irq(HD64465_IRQ_GPIO, 0);}module_init(hd64465_gpio_init);module_exit(hd64465_gpio_exit);MODULE_LICENSE("GPL");