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// SPDX-License-Identifier: GPL-2.0
/*
* 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.
*/
DEFINE_SPINLOCK(srm_irq_lock);
static inline void
srm_enable_irq(struct irq_data *d)
{
spin_lock(&srm_irq_lock);
cserve_ena(d->irq - 16);
spin_unlock(&srm_irq_lock);
}
static void
srm_disable_irq(struct irq_data *d)
{
spin_lock(&srm_irq_lock);
cserve_dis(d->irq - 16);
spin_unlock(&srm_irq_lock);
}
/* Handle interrupts from the SRM, assuming no additional weirdness. */
static struct irq_chip srm_irq_type = {
.name = "SRM",
.irq_unmask = srm_enable_irq,
.irq_mask = srm_disable_irq,
.irq_mask_ack = srm_disable_irq,
};
void __init
init_srm_irqs(long max, unsigned long ignore_mask)
{
long i;
if (NR_IRQS <= 16)
return;
for (i = 16; i < max; ++i) {
if (i < 64 && ((ignore_mask >> i) & 1))
continue;
irq_set_chip_and_handler(i, &srm_irq_type, handle_level_irq);
irq_set_status_flags(i, IRQ_LEVEL);
}
}
void
srm_device_interrupt(unsigned long vector)
{
int irq = (vector - 0x800) >> 4;
handle_irq(irq);
}
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