/* linux/arch/arm/mach-s3c2410/bast-irq.c
*
* Copyright (c) 2004 Simtec Electronics
* Ben Dooks <ben@simtec.co.uk>
*
* http://www.simtec.co.uk/products/EB2410ITX/
*
* 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
*
* Modifications:
* 08-Jan-2003 BJD Moved from central IRQ code
*/
#include <linux/init.h>
#include <linux/module.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/hardware/s3c2410/irq.h>
#if 0
#include <asm/debug-ll.h>
#endif
#define irqdbf(x...)
#define irqdbf2(x...)
/* handle PC104 ISA interrupts from the system CPLD */
/* table of ISA irq nos to the relevant mask... zero means
* the irq is not implemented
*/
static unsigned char bast_pc104_irqmasks[] = {
0, /* 0 */
0, /* 1 */
0, /* 2 */
1, /* 3 */
0, /* 4 */
2, /* 5 */
0, /* 6 */
4, /* 7 */
0, /* 8 */
0, /* 9 */
8, /* 10 */
0, /* 11 */
0, /* 12 */
0, /* 13 */
0, /* 14 */
0, /* 15 */
};
static unsigned char bast_pc104_irqs[] = { 3, 5, 7, 10 };
static void
bast_pc104_mask(unsigned int irqno)
{
unsigned long temp;
temp = __raw_readb(BAST_VA_PC104_IRQMASK);
temp &= ~bast_pc104_irqmasks[irqno];
__raw_writeb(temp, BAST_VA_PC104_IRQMASK);
if (temp == 0)
bast_extint_mask(IRQ_ISA);
}
static void
bast_pc104_ack(unsigned int irqno)
{
bast_extint_ack(IRQ_ISA);
}
static void
bast_pc104_unmask(unsigned int irqno)
{
unsigned long temp;
temp = __raw_readb(BAST_VA_PC104_IRQMASK);
temp |= bast_pc104_irqmasks[irqno];
__raw_writeb(temp, BAST_VA_PC104_IRQMASK);
bast_extint_unmask(IRQ_ISA);
}
static struct bast_pc104_chip = {
.mask = bast_pc104_mask,
.unmask = bast_pc104_unmask,
.ack = bast_pc104_ack
};
static void
bast_irq_pc104_demux(unsigned int irq,
struct irqdesc *desc,
struct pt_regs *regs)
{
unsigned int stat;
unsigned int irqno;
int i;
stat = __raw_readb(BAST_VA_PC104_IRQREQ) & 0xf;
for (i = 0; i < 4 && stat != 0; i++) {
if (stat & 1) {
irqno = bast_pc104_irqs[i];
desc = irq_desc + irqno;
desc->handle(irqno, desc, regs);
}
stat >>= 1;
}
}
