LXR linux/arch/alpha/kernel/irq

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Handle interrupts from the SRM, assuming no additional weirdness.
   4 */
   5
   6#include <linux/init.h>
   7#include <linux/sched.h>
   8#include <linux/irq.h>
   9
  10#include "proto.h"
  11#include "irq_impl.h"
  12
  13
  14/*
  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.
  18 */
  19DEFINE_SPINLOCK(srm_irq_lock);
  20
  21static inline void
  22srm_enable_irq(struct irq_data *d)
  23{
  24        spin_lock(&srm_irq_lock);
  25        cserve_ena(d->irq - 16);
  26        spin_unlock(&srm_irq_lock);
  27}
  28
  29static void
  30srm_disable_irq(struct irq_data *d)
  31{
  32        spin_lock(&srm_irq_lock);
  33        cserve_dis(d->irq - 16);
  34        spin_unlock(&srm_irq_lock);
  35}
  36
  37/* Handle interrupts from the SRM, assuming no additional weirdness.  */
  38static struct irq_chip srm_irq_type = {
  39        .name           = "SRM",
  40        .irq_unmask     = srm_enable_irq,
  41        .irq_mask       = srm_disable_irq,
  42        .irq_mask_ack   = srm_disable_irq,
  43};
  44
  45void __init
  46init_srm_irqs(long max, unsigned long ignore_mask)
  47{
  48        long i;
  49
  50        if (NR_IRQS <= 16)
  51                return;
  52        for (i = 16; i < max; ++i) {
  53                if (i < 64 && ((ignore_mask >> i) & 1))
  54                        continue;
  55                irq_set_chip_and_handler(i, &srm_irq_type, handle_level_irq);
  56                irq_set_status_flags(i, IRQ_LEVEL);
  57        }
  58}
  59
  60void 
  61srm_device_interrupt(unsigned long vector)
  62{
  63        int irq = (vector - 0x800) >> 4;
  64        handle_irq(irq);
  65}
  66