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/* linux/arch/arm/mach-s3c2440/irq.c
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*
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* Copyright ( c ) 2003 - 2004 Simtec Electronics
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* Ben Dooks < ben @ simtec . co . uk >
*
* 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
*
*/
# include <linux/init.h>
# include <linux/module.h>
# include <linux/interrupt.h>
# include <linux/ioport.h>
# include <linux/sysdev.h>
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# include <linux/io.h>
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# include <mach/hardware.h>
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# include <asm/irq.h>
# include <asm/mach/irq.h>
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# include <mach/regs-irq.h>
# include <mach/regs-gpio.h>
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# include <plat/cpu.h>
# include <plat/pm.h>
# include <plat/irq.h>
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/* WDT/AC97 */
static void s3c_irq_demux_wdtac97 ( unsigned int irq ,
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struct irq_desc * desc )
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{
unsigned int subsrc , submsk ;
/* read the current pending interrupts, and the mask
* for what it is available */
subsrc = __raw_readl ( S3C2410_SUBSRCPND ) ;
submsk = __raw_readl ( S3C2410_INTSUBMSK ) ;
subsrc & = ~ submsk ;
subsrc > > = 13 ;
subsrc & = 3 ;
if ( subsrc ! = 0 ) {
if ( subsrc & 1 ) {
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generic_handle_irq ( IRQ_S3C2440_WDT ) ;
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}
if ( subsrc & 2 ) {
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generic_handle_irq ( IRQ_S3C2440_AC97 ) ;
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}
}
}
# define INTMSK_WDT (1UL << (IRQ_WDT - IRQ_EINT0))
static void
s3c_irq_wdtac97_mask ( unsigned int irqno )
{
s3c_irqsub_mask ( irqno , INTMSK_WDT , 3 < < 13 ) ;
}
static void
s3c_irq_wdtac97_unmask ( unsigned int irqno )
{
s3c_irqsub_unmask ( irqno , INTMSK_WDT ) ;
}
static void
s3c_irq_wdtac97_ack ( unsigned int irqno )
{
s3c_irqsub_maskack ( irqno , INTMSK_WDT , 3 < < 13 ) ;
}
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static struct irq_chip s3c_irq_wdtac97 = {
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. mask = s3c_irq_wdtac97_mask ,
. unmask = s3c_irq_wdtac97_unmask ,
. ack = s3c_irq_wdtac97_ack ,
} ;
static int s3c2440_irq_add ( struct sys_device * sysdev )
{
unsigned int irqno ;
printk ( " S3C2440: IRQ Support \n " ) ;
/* add new chained handler for wdt, ac7 */
set_irq_chip ( IRQ_WDT , & s3c_irq_level_chip ) ;
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set_irq_handler ( IRQ_WDT , handle_level_irq ) ;
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set_irq_chained_handler ( IRQ_WDT , s3c_irq_demux_wdtac97 ) ;
for ( irqno = IRQ_S3C2440_WDT ; irqno < = IRQ_S3C2440_AC97 ; irqno + + ) {
set_irq_chip ( irqno , & s3c_irq_wdtac97 ) ;
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set_irq_handler ( irqno , handle_level_irq ) ;
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set_irq_flags ( irqno , IRQF_VALID ) ;
}
return 0 ;
}
static struct sysdev_driver s3c2440_irq_driver = {
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. add = s3c2440_irq_add ,
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} ;
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static int s3c2440_irq_init ( void )
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{
return sysdev_driver_register ( & s3c2440_sysclass , & s3c2440_irq_driver ) ;
}
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arch_initcall ( s3c2440_irq_init ) ;
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