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80 lines
1.6 KiB
80 lines
1.6 KiB
20 years ago
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/*
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* Handle interrupts from the SRM, assuming no additional weirdness.
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*/
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#include <linux/init.h>
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#include <linux/sched.h>
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#include <linux/irq.h>
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#include "proto.h"
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#include "irq_impl.h"
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/*
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* Is the palcode SMP safe? In other words: can we call cserve_ena/dis
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* at the same time in multiple CPUs? To be safe I added a spinlock
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* but it can be removed trivially if the palcode is robust against smp.
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*/
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DEFINE_SPINLOCK(srm_irq_lock);
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static inline void
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srm_enable_irq(unsigned int irq)
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{
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spin_lock(&srm_irq_lock);
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cserve_ena(irq - 16);
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spin_unlock(&srm_irq_lock);
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}
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static void
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srm_disable_irq(unsigned int irq)
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{
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spin_lock(&srm_irq_lock);
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cserve_dis(irq - 16);
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spin_unlock(&srm_irq_lock);
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}
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static unsigned int
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srm_startup_irq(unsigned int irq)
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{
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srm_enable_irq(irq);
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return 0;
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}
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static void
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srm_end_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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srm_enable_irq(irq);
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}
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/* Handle interrupts from the SRM, assuming no additional weirdness. */
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static struct hw_interrupt_type srm_irq_type = {
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.typename = "SRM",
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.startup = srm_startup_irq,
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.shutdown = srm_disable_irq,
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.enable = srm_enable_irq,
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.disable = srm_disable_irq,
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.ack = srm_disable_irq,
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.end = srm_end_irq,
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};
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void __init
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init_srm_irqs(long max, unsigned long ignore_mask)
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{
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long i;
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for (i = 16; i < max; ++i) {
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if (i < 64 && ((ignore_mask >> i) & 1))
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continue;
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irq_desc[i].status = IRQ_DISABLED | IRQ_LEVEL;
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irq_desc[i].handler = &srm_irq_type;
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}
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}
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void
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srm_device_interrupt(unsigned long vector, struct pt_regs * regs)
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{
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int irq = (vector - 0x800) >> 4;
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handle_irq(irq, regs);
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}
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