[MIPS] Import updates from i386's i8259.c
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>
diff --git a/include/asm-mips/i8259.h b/include/asm-mips/i8259.h
index 0214abe..4df8d8b 100644
--- a/include/asm-mips/i8259.h
+++ b/include/asm-mips/i8259.h
@@ -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 @@
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 @@
* 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 */