1b2441318SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0
21da177e4SLinus Torvalds /*
31da177e4SLinus Torvalds * Handle interrupts from the SRM, assuming no additional weirdness.
41da177e4SLinus Torvalds */
51da177e4SLinus Torvalds
61da177e4SLinus Torvalds #include <linux/init.h>
71da177e4SLinus Torvalds #include <linux/sched.h>
81da177e4SLinus Torvalds #include <linux/irq.h>
91da177e4SLinus Torvalds
101da177e4SLinus Torvalds #include "proto.h"
111da177e4SLinus Torvalds #include "irq_impl.h"
121da177e4SLinus Torvalds
131da177e4SLinus Torvalds
141da177e4SLinus Torvalds /*
151da177e4SLinus Torvalds * Is the palcode SMP safe? In other words: can we call cserve_ena/dis
161da177e4SLinus Torvalds * at the same time in multiple CPUs? To be safe I added a spinlock
171da177e4SLinus Torvalds * but it can be removed trivially if the palcode is robust against smp.
181da177e4SLinus Torvalds */
191da177e4SLinus Torvalds DEFINE_SPINLOCK(srm_irq_lock);
201da177e4SLinus Torvalds
211da177e4SLinus Torvalds static inline void
srm_enable_irq(struct irq_data * d)2235252254SThomas Gleixner srm_enable_irq(struct irq_data *d)
231da177e4SLinus Torvalds {
241da177e4SLinus Torvalds spin_lock(&srm_irq_lock);
2535252254SThomas Gleixner cserve_ena(d->irq - 16);
261da177e4SLinus Torvalds spin_unlock(&srm_irq_lock);
271da177e4SLinus Torvalds }
281da177e4SLinus Torvalds
291da177e4SLinus Torvalds static void
srm_disable_irq(struct irq_data * d)3035252254SThomas Gleixner srm_disable_irq(struct irq_data *d)
311da177e4SLinus Torvalds {
321da177e4SLinus Torvalds spin_lock(&srm_irq_lock);
3335252254SThomas Gleixner cserve_dis(d->irq - 16);
341da177e4SLinus Torvalds spin_unlock(&srm_irq_lock);
351da177e4SLinus Torvalds }
361da177e4SLinus Torvalds
371da177e4SLinus Torvalds /* Handle interrupts from the SRM, assuming no additional weirdness. */
3844377f62SThomas Gleixner static struct irq_chip srm_irq_type = {
398ab1221cSThomas Gleixner .name = "SRM",
4035252254SThomas Gleixner .irq_unmask = srm_enable_irq,
4135252254SThomas Gleixner .irq_mask = srm_disable_irq,
4235252254SThomas Gleixner .irq_mask_ack = srm_disable_irq,
431da177e4SLinus Torvalds };
441da177e4SLinus Torvalds
451da177e4SLinus Torvalds void __init
init_srm_irqs(long max,unsigned long ignore_mask)461da177e4SLinus Torvalds init_srm_irqs(long max, unsigned long ignore_mask)
471da177e4SLinus Torvalds {
481da177e4SLinus Torvalds long i;
491da177e4SLinus Torvalds
5070b66cbfSIvan Kokshaysky if (NR_IRQS <= 16)
5170b66cbfSIvan Kokshaysky return;
521da177e4SLinus Torvalds for (i = 16; i < max; ++i) {
531da177e4SLinus Torvalds if (i < 64 && ((ignore_mask >> i) & 1))
541da177e4SLinus Torvalds continue;
55a9eb076bSThomas Gleixner irq_set_chip_and_handler(i, &srm_irq_type, handle_level_irq);
5635252254SThomas Gleixner irq_set_status_flags(i, IRQ_LEVEL);
571da177e4SLinus Torvalds }
581da177e4SLinus Torvalds }
591da177e4SLinus Torvalds
601da177e4SLinus Torvalds void
srm_device_interrupt(unsigned long vector)617ca56053SAl Viro srm_device_interrupt(unsigned long vector)
621da177e4SLinus Torvalds {
631da177e4SLinus Torvalds int irq = (vector - 0x800) >> 4;
643dbb8c62SAl Viro handle_irq(irq);
651da177e4SLinus Torvalds }
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