irq.c

一个可以移植到linux2.6内核的网卡驱动

/* linux/arch/arm/mach-s3c2410/irq.c
 *
 * Copyright (c) 2003,2004 Simtec Electronics
 *	Ben Dooks <[e-mail]>
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Changelog:
 *
 *   22-Jul-2004  Ben Dooks <[e-mail]>
 *                Fixed compile warnings
 *
 *   22-Jul-2004  Roc Wu <[e-mail]>
 *                Fixed s3c_extirq_type
 *
 *   21-Jul-2004  Arnaud Patard (Rtp) <[e-mail]>
 *                Addition of ADC/TC demux
 *
 *   04-Oct-2004  Klaus Fetscher <[e-mail]>
 *		  Fix for set_irq_type() on low EINT numbers
 *
 *   05-Oct-2004  Ben Dooks <[e-mail]>
 *		  Tidy up KF's patch and sort out new release
 *
 *   05-Oct-2004  Ben Dooks <[e-mail]>
 *		  Add support for power management controls
 *
 *   04-Nov-2004  Ben Dooks
 *		  Fix standard IRQ wake for EINT0..4 and RTC
*/

#include <linux/init.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/ptrace.h>
#include <linux/sysdev.h>

#include <asm/hardware.h>
#include <asm/irq.h>
#include <asm/io.h>

#include <asm/mach/irq.h>

#include <asm/arch/regs-irq.h>
#include <asm/arch/regs-gpio.h>

#include "pm.h"

#define irqdbf(x...)
#define irqdbf2(x...)

#define EXTINT_OFF (IRQ_EINT4 - 4)

/* wakeup irq control */

#ifdef CONFIG_PM

/* state for IRQs over sleep */

/* default is to allow for EINT0..EINT15, and IRQ_RTC as wakeup sources
 *
 * set bit to 1 in allow bitfield to enable the wakeup settings on it
*/

unsigned long s3c_irqwake_intallow	= 1L << (IRQ_RTC - IRQ_EINT0) | 0xfL;
unsigned long s3c_irqwake_intmask	= 0xffffffffL;
unsigned long s3c_irqwake_eintallow	= 0x0000fff0L;
unsigned long s3c_irqwake_eintmask	= 0xffffffffL;

static int
s3c_irq_wake(unsigned int irqno, unsigned int state)
{
	unsigned long irqbit = 1 << (irqno - IRQ_EINT0);

	if (!(s3c_irqwake_intallow & irqbit))
		return -ENOENT;

	printk(KERN_INFO "wake %s for irq %d\n",
	       state ? "enabled" : "disabled", irqno);

	if (!state)
		s3c_irqwake_intmask |= irqbit;
	else
		s3c_irqwake_intmask &= ~irqbit;

	return 0;
}

static int
s3c_irqext_wake(unsigned int irqno, unsigned int state)
{
	unsigned long bit = 1L << (irqno - EXTINT_OFF);

	if (!(s3c_irqwake_eintallow & bit))
		return -ENOENT;

	printk(KERN_INFO "wake %s for irq %d\n",
	       state ? "enabled" : "disabled", irqno);

	if (!state)
		s3c_irqwake_eintmask |= bit;
	else
		s3c_irqwake_eintmask &= ~bit;

	return 0;
}

#else
#define s3c_irqext_wake NULL
#define s3c_irq_wake NULL
#endif


static void
s3c_irq_mask(unsigned int irqno)
{
	unsigned long mask;

	irqno -= IRQ_EINT0;

	mask = __raw_readl(S3C2410_INTMSK);
	mask |= 1UL << irqno;
	__raw_writel(mask, S3C2410_INTMSK);
}

static inline void
s3c_irq_ack(unsigned int irqno)
{
	unsigned long bitval = 1UL << (irqno - IRQ_EINT0);

	__raw_writel(bitval, S3C2410_SRCPND);
	__raw_writel(bitval, S3C2410_INTPND);
}

static inline void
s3c_irq_maskack(unsigned int irqno)
{
	unsigned long bitval = 1UL << (irqno - IRQ_EINT0);
	unsigned long mask;

	mask = __raw_readl(S3C2410_INTMSK);
	__raw_writel(mask|bitval, S3C2410_INTMSK);

	__raw_writel(bitval, S3C2410_SRCPND);
	__raw_writel(bitval, S3C2410_INTPND);
}


static void
s3c_irq_unmask(unsigned int irqno)
{
	unsigned long mask;

	if (irqno != IRQ_TIMER4 && irqno != IRQ_EINT8t23)
		irqdbf2("s3c_irq_unmask %d\n", irqno);

	irqno -= IRQ_EINT0;

	mask = __raw_readl(S3C2410_INTMSK);
	mask &= ~(1UL << irqno);
	__raw_writel(mask, S3C2410_INTMSK);
}

static struct irqchip s3c_irq_level_chip = {
	.ack	   = s3c_irq_maskack,
	.mask	   = s3c_irq_mask,
	.unmask	   = s3c_irq_unmask,
	.wake	   = s3c_irq_wake
};

static struct irqchip s3c_irq_chip = {
	.ack	   = s3c_irq_ack,
	.mask	   = s3c_irq_mask,
	.unmask	   = s3c_irq_unmask,
	.wake	   = s3c_irq_wake
};

/* S3C2410_EINTMASK
 * S3C2410_EINTPEND
 */

static void
s3c_irqext_mask(unsigned int irqno)
{
	unsigned long mask;

	irqno -= EXTINT_OFF;

	mask = __raw_readl(S3C2410_EINTMASK);
	mask |= ( 1UL << irqno);
	__raw_writel(mask, S3C2410_EINTMASK);

	if (irqno <= (IRQ_EINT7 - EXTINT_OFF)) {
		/* check to see if all need masking */

		if ((mask & (0xf << 4)) == (0xf << 4)) {
			/* all masked, mask the parent */
			s3c_irq_mask(IRQ_EINT4t7);
		}
	} else {
		/* todo: the same check as above for the rest of the irq regs...*/

	}
}

static void
s3c_irqext_ack(unsigned int irqno)
{
	unsigned long req;
	unsigned long bit;
	unsigned long mask;

	bit = 1UL << (irqno - EXTINT_OFF);


	mask = __raw_readl(S3C2410_EINTMASK);

	__raw_writel(bit, S3C2410_EINTPEND);

	req = __raw_readl(S3C2410_EINTPEND);
	req &= ~mask;

	/* not sure if we should be acking the parent irq... */

	if (irqno <= IRQ_EINT7 ) {
		if ((req & 0xf0) == 0)
			s3c_irq_ack(IRQ_EINT4t7);
	} else {
		if ((req >> 8) == 0)
			s3c_irq_ack(IRQ_EINT8t23);
	}
}

static void
s3c_irqext_unmask(unsigned int irqno)
{
	unsigned long mask;

	irqno -= EXTINT_OFF;

	mask = __raw_readl(S3C2410_EINTMASK);
	mask &= ~( 1UL << irqno);
	__raw_writel(mask, S3C2410_EINTMASK);

	s3c_irq_unmask((irqno <= (IRQ_EINT7 - EXTINT_OFF)) ? IRQ_EINT4t7 : IRQ_EINT8t23);
}

static int
s3c_irqext_type(unsigned int irq, unsigned int type)
{
	unsigned long extint_reg;
	unsigned long gpcon_reg;
	unsigned long gpcon_offset, extint_offset;
	unsigned long newvalue = 0, value;

	if ((irq >= IRQ_EINT0) && (irq <= IRQ_EINT3))
	{
		gpcon_reg = S3C2410_GPFCON;
		extint_reg = S3C2410_EXTINT0;
		gpcon_offset = (irq - IRQ_EINT0) * 2;
		extint_offset = (irq - IRQ_EINT0) * 4;
	}
	else if ((irq >= IRQ_EINT4) && (irq <= IRQ_EINT7))
	{
		gpcon_reg = S3C2410_GPFCON;
		extint_reg = S3C2410_EXTINT0;
		gpcon_offset = (irq - (EXTINT_OFF)) * 2;
		extint_offset = (irq - (EXTINT_OFF)) * 4;
	}
	else if ((irq >= IRQ_EINT8) && (irq <= IRQ_EINT15))
	{
		gpcon_reg = S3C2410_GPGCON;
		extint_reg = S3C2410_EXTINT1;
		gpcon_offset = (irq - IRQ_EINT8) * 2;
		extint_offset = (irq - IRQ_EINT8) * 4;
	}
	else if ((irq >= IRQ_EINT16) && (irq <= IRQ_EINT23))
	{
		gpcon_reg = S3C2410_GPGCON;
		extint_reg = S3C2410_EXTINT2;
		gpcon_offset = (irq - IRQ_EINT8) * 2;
		extint_offset = (irq - IRQ_EINT16) * 4;
	} else
		return -1;

	/* Set the GPIO to external interrupt mode */
	value = __raw_readl(gpcon_reg);
	value = (value & ~(3 << gpcon_offset)) | (0x02 << gpcon_offset);
	__raw_writel(value, gpcon_reg);

	/* Set the external interrupt to pointed trigger type */
	switch (type)
	{
		case IRQT_NOEDGE:
			printk(KERN_WARNING "No edge setting!\n");
			break;

		case IRQT_RISING:
			newvalue = S3C2410_EXTINT_RISEEDGE;
			break;

		case IRQT_FALLING:
			newvalue = S3C2410_EXTINT_FALLEDGE;
			break;

		case IRQT_BOTHEDGE:
			newvalue = S3C2410_EXTINT_BOTHEDGE;
			break;

		case IRQT_LOW:
			newvalue = S3C2410_EXTINT_LOWLEV;
			break;

		case IRQT_HIGH:
			newvalue = S3C2410_EXTINT_HILEV;
			break;

		default:
			printk(KERN_ERR "No such irq type %d", type);
			return -1;
	}

	value = __raw_readl(extint_reg);
	value = (value & ~(7 << extint_offset)) | (newvalue << extint_offset);
	__raw_writel(value, extint_reg);

	return 0;
}

static struct irqchip s3c_irqext_chip = {
	.mask	    = s3c_irqext_mask,
	.unmask	    = s3c_irqext_unmask,
	.ack	    = s3c_irqext_ack,
	.type	    = s3c_irqext_type,
	.wake	    = s3c_irqext_wake
};

static struct irqchip s3c_irq_eint0t4 = {
	.ack	   = s3c_irq_ack,
	.mask	   = s3c_irq_mask,
	.unmask	   = s3c_irq_unmask,
	.wake	   = s3c_irq_wake,
	.type	   = s3c_irqext_type,
};

/* mask values for the parent registers for each of the interrupt types */

#define INTMSK_UART0	 (1UL << (IRQ_UART0 - IRQ_EINT0))
#define INTMSK_UART1	 (1UL << (IRQ_UART1 - IRQ_EINT0))
#define INTMSK_UART2	 (1UL << (IRQ_UART2 - IRQ_EINT0))
#define INTMSK_ADCPARENT (1UL << (IRQ_ADCPARENT - IRQ_EINT0))
#define INTMSK_LCD	 (1UL << (IRQ_LCD - IRQ_EINT0))

static inline void
s3c_irqsub_mask(unsigned int irqno, unsigned int parentbit,
		int subcheck)
{
	unsigned long mask;
	unsigned long submask;

	submask = __raw_readl(S3C2410_INTSUBMSK);
	mask = __raw_readl(S3C2410_INTMSK);

	submask |= (1UL << (irqno - IRQ_S3CUART_RX0));

	/* check to see if we need to mask the parent IRQ */

	if ((submask  & subcheck) == subcheck) {
		__raw_writel(mask | parentbit, S3C2410_INTMSK);
	}

	/* write back masks */
	__raw_writel(submask, S3C2410_INTSUBMSK);