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128 lines
3.0 KiB
128 lines
3.0 KiB
/* $Id: irq.c,v 1.1.2.4 2002/11/04 20:33:56 lethal Exp $
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*
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* arch/sh/boards/cqreek/irq.c
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*
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* Copyright (C) 2000 Niibe Yutaka
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*
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* CqREEK IDE/ISA Bridge Support.
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*
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*/
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#include <linux/irq.h>
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#include <linux/init.h>
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#include <asm/cqreek/cqreek.h>
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#include <asm/io.h>
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#include <asm/io_generic.h>
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#include <asm/irq.h>
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#include <asm/machvec.h>
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#include <asm/machvec_init.h>
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#include <asm/rtc.h>
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struct cqreek_irq_data {
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unsigned short mask_port; /* Port of Interrupt Mask Register */
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unsigned short stat_port; /* Port of Interrupt Status Register */
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unsigned short bit; /* Value of the bit */
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};
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static struct cqreek_irq_data cqreek_irq_data[NR_IRQS];
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static void disable_cqreek_irq(unsigned int irq)
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{
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unsigned long flags;
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unsigned short mask;
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unsigned short mask_port = cqreek_irq_data[irq].mask_port;
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unsigned short bit = cqreek_irq_data[irq].bit;
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local_irq_save(flags);
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/* Disable IRQ */
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mask = inw(mask_port) & ~bit;
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outw_p(mask, mask_port);
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local_irq_restore(flags);
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}
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static void enable_cqreek_irq(unsigned int irq)
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{
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unsigned long flags;
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unsigned short mask;
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unsigned short mask_port = cqreek_irq_data[irq].mask_port;
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unsigned short bit = cqreek_irq_data[irq].bit;
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local_irq_save(flags);
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/* Enable IRQ */
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mask = inw(mask_port) | bit;
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outw_p(mask, mask_port);
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local_irq_restore(flags);
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}
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static void mask_and_ack_cqreek(unsigned int irq)
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{
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unsigned short stat_port = cqreek_irq_data[irq].stat_port;
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unsigned short bit = cqreek_irq_data[irq].bit;
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disable_cqreek_irq(irq);
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/* Clear IRQ (it might be edge IRQ) */
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inw(stat_port);
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outw_p(bit, stat_port);
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}
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static void end_cqreek_irq(unsigned int irq)
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{
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if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
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enable_cqreek_irq(irq);
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}
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static unsigned int startup_cqreek_irq(unsigned int irq)
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{
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enable_cqreek_irq(irq);
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return 0;
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}
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static void shutdown_cqreek_irq(unsigned int irq)
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{
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disable_cqreek_irq(irq);
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}
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static struct hw_interrupt_type cqreek_irq_type = {
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.typename = "CqREEK-IRQ",
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.startup = startup_cqreek_irq,
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.shutdown = shutdown_cqreek_irq,
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.enable = enable_cqreek_irq,
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.disable = disable_cqreek_irq,
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.ack = mask_and_ack_cqreek,
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.end = end_cqreek_irq
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};
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int cqreek_has_ide, cqreek_has_isa;
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/* XXX: This is just for test for my NE2000 ISA board
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What we really need is virtualized IRQ and demultiplexer like HP600 port */
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void __init init_cqreek_IRQ(void)
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{
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if (cqreek_has_ide) {
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cqreek_irq_data[14].mask_port = BRIDGE_IDE_INTR_MASK;
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cqreek_irq_data[14].stat_port = BRIDGE_IDE_INTR_STAT;
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cqreek_irq_data[14].bit = 1;
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irq_desc[14].handler = &cqreek_irq_type;
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irq_desc[14].status = IRQ_DISABLED;
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irq_desc[14].action = 0;
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irq_desc[14].depth = 1;
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disable_cqreek_irq(14);
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}
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if (cqreek_has_isa) {
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cqreek_irq_data[10].mask_port = BRIDGE_ISA_INTR_MASK;
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cqreek_irq_data[10].stat_port = BRIDGE_ISA_INTR_STAT;
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cqreek_irq_data[10].bit = (1 << 10);
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/* XXX: Err... we may need demultiplexer for ISA irq... */
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irq_desc[10].handler = &cqreek_irq_type;
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irq_desc[10].status = IRQ_DISABLED;
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irq_desc[10].action = 0;
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irq_desc[10].depth = 1;
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disable_cqreek_irq(10);
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}
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}
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