1 // SPDX-License-Identifier: GPL-2.0
3 * Handle interrupts from the SRM, assuming no additional weirdness.
6 #include <linux/init.h>
7 #include <linux/sched.h>
15 * Is the palcode SMP safe? In other words: can we call cserve_ena/dis
16 * at the same time in multiple CPUs? To be safe I added a spinlock
17 * but it can be removed trivially if the palcode is robust against smp.
19 DEFINE_SPINLOCK(srm_irq_lock);
22 srm_enable_irq(struct irq_data *d)
24 spin_lock(&srm_irq_lock);
25 cserve_ena(d->irq - 16);
26 spin_unlock(&srm_irq_lock);
30 srm_disable_irq(struct irq_data *d)
32 spin_lock(&srm_irq_lock);
33 cserve_dis(d->irq - 16);
34 spin_unlock(&srm_irq_lock);
37 /* Handle interrupts from the SRM, assuming no additional weirdness. */
38 static struct irq_chip srm_irq_type = {
40 .irq_unmask = srm_enable_irq,
41 .irq_mask = srm_disable_irq,
42 .irq_mask_ack = srm_disable_irq,
46 init_srm_irqs(long max, unsigned long ignore_mask)
52 for (i = 16; i < max; ++i) {
53 if (i < 64 && ((ignore_mask >> i) & 1))
55 irq_set_chip_and_handler(i, &srm_irq_type, handle_level_irq);
56 irq_set_status_flags(i, IRQ_LEVEL);
61 srm_device_interrupt(unsigned long vector)
63 int irq = (vector - 0x800) >> 4;