Viewing file:  irq_srm.c (1.59 KB) -rw-r--r--
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/*
* Handle interrupts from the SRM, assuming no additional weirdness.
*/
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/irq.h>
#include "proto.h"
#include "irq_impl.h"
/*
* Is the palcode SMP safe? In other words: can we call cserve_ena/dis
* at the same time in multiple CPUs? To be safe I added a spinlock
* but it can be removed trivially if the palcode is robust against smp.
*/
spinlock_t srm_irq_lock = SPIN_LOCK_UNLOCKED;
static inline void
srm_enable_irq(unsigned int irq)
{
spin_lock(&srm_irq_lock);
cserve_ena(irq - 16);
spin_unlock(&srm_irq_lock);
}
static void
srm_disable_irq(unsigned int irq)
{
spin_lock(&srm_irq_lock);
cserve_dis(irq - 16);
spin_unlock(&srm_irq_lock);
}
static unsigned int
srm_startup_irq(unsigned int irq)
{
srm_enable_irq(irq);
return 0;
}
static void
srm_end_irq(unsigned int irq)
{
if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
srm_enable_irq(irq);
}
/* Handle interrupts from the SRM, assuming no additional weirdness. */
static struct hw_interrupt_type srm_irq_type = {
typename: "SRM",
startup: srm_startup_irq,
shutdown: srm_disable_irq,
enable: srm_enable_irq,
disable: srm_disable_irq,
ack: srm_disable_irq,
end: srm_end_irq,
};
void __init
init_srm_irqs(long max, unsigned long ignore_mask)
{
long i;
for (i = 16; i < max; ++i) {
if (i < 64 && ((ignore_mask >> i) & 1))
continue;
irq_desc[i].status = IRQ_DISABLED | IRQ_LEVEL;
irq_desc[i].handler = &srm_irq_type;
}
}
void
srm_device_interrupt(unsigned long vector, struct pt_regs * regs)
{
int irq = (vector - 0x800) >> 4;
handle_irq(irq, regs);
}
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