133 lines
2.8 KiB
C
133 lines
2.8 KiB
C
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/* linux/arch/arm/mach-s3c2410/bast-irq.c
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*
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* Copyright (c) 2004 Simtec Electronics
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* Ben Dooks <ben@simtec.co.uk>
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*
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* http://www.simtec.co.uk/products/EB2410ITX/
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Modifications:
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* 08-Jan-2003 BJD Moved from central IRQ code
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/ioport.h>
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#include <linux/ptrace.h>
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#include <linux/sysdev.h>
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#include <asm/hardware.h>
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#include <asm/irq.h>
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#include <asm/io.h>
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#include <asm/mach/irq.h>
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#include <asm/hardware/s3c2410/irq.h>
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#if 0
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#include <asm/debug-ll.h>
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#endif
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#define irqdbf(x...)
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#define irqdbf2(x...)
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/* handle PC104 ISA interrupts from the system CPLD */
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/* table of ISA irq nos to the relevant mask... zero means
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* the irq is not implemented
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*/
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static unsigned char bast_pc104_irqmasks[] = {
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0, /* 0 */
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0, /* 1 */
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0, /* 2 */
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1, /* 3 */
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0, /* 4 */
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2, /* 5 */
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0, /* 6 */
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4, /* 7 */
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0, /* 8 */
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0, /* 9 */
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8, /* 10 */
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0, /* 11 */
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0, /* 12 */
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0, /* 13 */
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0, /* 14 */
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0, /* 15 */
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};
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static unsigned char bast_pc104_irqs[] = { 3, 5, 7, 10 };
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static void
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bast_pc104_mask(unsigned int irqno)
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{
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unsigned long temp;
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temp = __raw_readb(BAST_VA_PC104_IRQMASK);
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temp &= ~bast_pc104_irqmasks[irqno];
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__raw_writeb(temp, BAST_VA_PC104_IRQMASK);
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if (temp == 0)
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bast_extint_mask(IRQ_ISA);
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}
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static void
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bast_pc104_ack(unsigned int irqno)
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{
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bast_extint_ack(IRQ_ISA);
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}
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static void
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bast_pc104_unmask(unsigned int irqno)
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{
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unsigned long temp;
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temp = __raw_readb(BAST_VA_PC104_IRQMASK);
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temp |= bast_pc104_irqmasks[irqno];
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__raw_writeb(temp, BAST_VA_PC104_IRQMASK);
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bast_extint_unmask(IRQ_ISA);
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}
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static struct bast_pc104_chip = {
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.mask = bast_pc104_mask,
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.unmask = bast_pc104_unmask,
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.ack = bast_pc104_ack
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};
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static void
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bast_irq_pc104_demux(unsigned int irq,
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struct irqdesc *desc,
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struct pt_regs *regs)
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{
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unsigned int stat;
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unsigned int irqno;
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int i;
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stat = __raw_readb(BAST_VA_PC104_IRQREQ) & 0xf;
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for (i = 0; i < 4 && stat != 0; i++) {
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if (stat & 1) {
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irqno = bast_pc104_irqs[i];
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desc = irq_desc + irqno;
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desc->handle(irqno, desc, regs);
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}
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stat >>= 1;
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}
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}
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