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irq_srm.c

/*
 * 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(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].chip = &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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