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[MIPS] Import updates from i386's i8259.c

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Import many updates from i386's i8259.c, especially genirq transitions.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Atsushi Nemoto 2006-12-07 02:04:17 +09:00 • committed by Ralf Baechle
commit 2cafe97846
2 changed files with 115 additions and 84 deletions
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37
include/asm-mips/i8259.h
View file

@ -19,10 +19,31 @@
#include <asm/io.h>
/* i8259A PIC registers */
#define PIC_MASTER_CMD 0x20
#define PIC_MASTER_IMR 0x21
#define PIC_MASTER_ISR PIC_MASTER_CMD
#define PIC_MASTER_POLL PIC_MASTER_ISR
#define PIC_MASTER_OCW3 PIC_MASTER_ISR
#define PIC_SLAVE_CMD 0xa0
#define PIC_SLAVE_IMR 0xa1
/* i8259A PIC related value */
#define PIC_CASCADE_IR 2
#define MASTER_ICW4_DEFAULT 0x01
#define SLAVE_ICW4_DEFAULT 0x01
#define PIC_ICW4_AEOI 2
extern spinlock_t i8259A_lock;
extern void init_8259A(int auto_eoi);
extern void enable_8259A_irq(unsigned int irq);
extern void disable_8259A_irq(unsigned int irq);
extern void init_i8259_irqs(void);
#define I8259A_IRQ_BASE 0
/*
* Do the traditional i8259 interrupt polling thing. This is for the few
* cases where no better interrupt acknowledge method is available and we
@ -35,15 +56,15 @@ static inline int i8259_irq(void)
spin_lock(&i8259A_lock);
/* Perform an interrupt acknowledge cycle on controller 1. */
outb(0x0C, 0x20); /* prepare for poll */
irq = inb(0x20) & 7;
if (irq == 2) {
outb(0x0C, PIC_MASTER_CMD); /* prepare for poll */
irq = inb(PIC_MASTER_CMD) & 7;
if (irq == PIC_CASCADE_IR) {
/*
* Interrupt is cascaded so perform interrupt
* acknowledge on controller 2.
*/
outb(0x0C, 0xA0); /* prepare for poll */
irq = (inb(0xA0) & 7) + 8;
outb(0x0C, PIC_SLAVE_CMD); /* prepare for poll */
irq = (inb(PIC_SLAVE_CMD) & 7) + 8;
}
if (unlikely(irq == 7)) {
@ -54,14 +75,14 @@ static inline int i8259_irq(void)
* significant bit is not set then there is no valid
* interrupt.
*/
outb(0x0B, 0x20); /* ISR register */
if(~inb(0x20) & 0x80)
outb(0x0B, PIC_MASTER_ISR); /* ISR register */
if(~inb(PIC_MASTER_ISR) & 0x80)
irq = -1;
}
spin_unlock(&i8259A_lock);
return irq;
return likely(irq >= 0) ? irq + I8259A_IRQ_BASE : irq;
}
#endif /* _ASM_I8259_H */