path: root/arch/sparc/kernel/irq_64.c

/* irq.c: UltraSparc IRQ handling/init/registry.
 *
 * Copyright (C) 1997, 2007, 2008 David S. Miller (davem@davemloft.net)
 * Copyright (C) 1998  Eddie C. Dost    (ecd@skynet.be)
 * Copyright (C) 1998  Jakub Jelinek    (jj@ultra.linux.cz)
 */

#include <linux/module.h>
#include <linux/sched.h>
#include <linux/linkage.h>
#include <linux/ptrace.h>
#include <linux/errno.h>
#include <linux/kernel_stat.h>
#include <linux/signal.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/random.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/ftrace.h>
#include <linux/irq.h>
#include <linux/kmemleak.h>

#include <asm/ptrace.h>
#include <asm/processor.h>
#include <linux/atomic.h>
#include <asm/system.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <asm/iommu.h>
#include <asm/upa.h>
#include <asm/oplib.h>
#include <asm/prom.h>
#include <asm/timer.h>
#include <asm/smp.h>
#include <asm/starfire.h>
#include <asm/uaccess.h>
#include <asm/cache.h>
#include <asm/cpudata.h>
#include <asm/auxio.h>
#include <asm/head.h>
#include <asm/hypervisor.h>
#include <asm/cacheflush.h>

#include "entry.h"
#include "cpumap.h"
#include "kstack.h"

#define NUM_IVECS	(IMAP_INR + 1)

struct ino_bucket *ivector_table;
unsigned long ivector_table_pa;

/* On several sun4u processors, it is illegal to mix bypass and
 * non-bypass accesses.  Therefore we access all INO buckets
 * using bypass accesses only.
 */
static unsigned long bucket_get_chain_pa(unsigned long bucket_pa)
{
	unsigned long ret;

	__asm__ __volatile__("ldxa	[%1] %2, %0"
			     : "=&r" (ret)
			     : "r" (bucket_pa +
				    offsetof(struct ino_bucket,
					     __irq_chain_pa)),
			       "i" (ASI_PHYS_USE_EC));

	return ret;
}

static void bucket_clear_chain_pa(unsigned long bucket_pa)
{
	__asm__ __volatile__("stxa	%%g0, [%0] %1"
			     : /* no outputs */
			     : "r" (bucket_pa +
				    offsetof(struct ino_bucket,
					     __irq_chain_pa)),
			       "i" (ASI_PHYS_USE_EC));
}

static unsigned int bucket_get_irq(unsigned long bucket_pa)
{
	unsigned int ret;

	__asm__ __volatile__("lduwa	[%1] %2, %0"
			     : "=&r" (ret)
			     : "r" (bucket_pa +
				    offsetof(struct ino_bucket,
					     __irq)),
			       "i" (ASI_PHYS_USE_EC));

	return ret;
}

static void bucket_set_irq(unsigned long bucket_pa, unsigned int irq)
{
	__asm__ __volatile__("stwa	%0, [%1] %2"
			     : /* no outputs */
			     : "r" (irq),
			       "r" (bucket_pa +
				    offsetof(struct ino_bucket,
					     __irq)),
			       "i" (ASI_PHYS_USE_EC));
}

#define irq_work_pa(__cpu)	&(trap_block[(__cpu)].irq_worklist_pa)

static struct {
	unsigned int dev_handle;
	unsigned int dev_ino;
	unsigned int in_use;
} irq_table[NR_IRQS];
static DEFINE_SPINLOCK(irq_alloc_lock);

unsigned char irq_alloc(unsigned int dev_handle, unsigned int dev_ino)
{
	unsigned long flags;
	unsigned char ent;

	BUILD_BUG_ON(NR_IRQS >= 256);

	spin_lock_irqsave(&irq_alloc_lock, flags);

	for (ent = 1; ent < NR_IRQS; ent++) {
		if (!irq_table[ent].in_use)
			break;
	}
	if (ent >= NR_IRQS) {
		printk(KERN_ERR "IRQ: Out of virtual IRQs.\n");
		ent = 0;
	} else {
		irq_table[ent].dev_handle = dev_handle;
		irq_table[ent].dev_ino = dev_ino;
		irq_table[ent].in_use = 1;
	}

	spin_unlock_irqrestore(&irq_alloc_lock, flags);

	return ent;
}

#ifdef CONFIG_PCI_MSI
void irq_free(unsigned int irq)
{
	unsigned long flags;

	if (irq >= NR_IRQS)
		return;

	spin_lock_irqsave(&irq_alloc_lock, flags);

	irq_table[irq].in_use = 0;

	spin_unlock_irqrestore(&irq_alloc_lock, flags);
}
#endif

/*
 * /proc/interrupts printing:
 */
int arch_show_interrupts(struct seq_file *p, int prec)
{
	int j;

	seq_printf(p, "NMI: ");
	for_each_online_cpu(j)
		seq_printf(p, "%10u ", cpu_data(j).__nmi_count);
	seq_printf(p, "     Non-maskable interrupts\n");
	return 0;
}

static unsigned int sun4u_compute_tid(unsigned long imap, unsigned long cpuid)
{
	unsigned int tid;

	if (this_is_starfire) {
		tid = starfire_translate(imap, cpuid);
		tid <<= IMAP_TID_SHIFT;
		tid &= IMAP_TID_UPA;
	} else {
		if (tlb_type ==