linux/include/asm-sparc64/irq.h
David S. Miller 5f92c32936 [SPARC64]: Fix several bugs in MSI handling.
1) sun4{u,v}_build_msi() have improper return value handling.

   We should always return negative error codes, instead of
   using the magic value "0" which could in fact be a valid
   MSI number.

2) sun4{u,v}_build_msi() should return -ENOMEM instead of
   calling prom_prom() halt with kzalloc() of the interrupt
   data fails.

3) We 'remembered' the MSI number using a singleton in the
   struct device archdata area, this doesn't work for MSI-X
   which can cause multiple MSIs assosciated with one device.

   Delete that archdata member, and instead store the MSI
   number in the IRQ chip data area.

Signed-off-by: David S. Miller <davem@davemloft.net>
2007-08-30 23:06:51 -07:00

85 lines
2.7 KiB
C

/* $Id: irq.h,v 1.21 2002/01/23 11:27:36 davem Exp $
* irq.h: IRQ registers on the 64-bit Sparc.
*
* Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
* Copyright (C) 1998 Jakub Jelinek (jj@ultra.linux.cz)
*/
#ifndef _SPARC64_IRQ_H
#define _SPARC64_IRQ_H
#include <linux/linkage.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <asm/pil.h>
#include <asm/ptrace.h>
/* IMAP/ICLR register defines */
#define IMAP_VALID 0x80000000UL /* IRQ Enabled */
#define IMAP_TID_UPA 0x7c000000UL /* UPA TargetID */
#define IMAP_TID_JBUS 0x7c000000UL /* JBUS TargetID */
#define IMAP_TID_SHIFT 26
#define IMAP_AID_SAFARI 0x7c000000UL /* Safari AgentID */
#define IMAP_AID_SHIFT 26
#define IMAP_NID_SAFARI 0x03e00000UL /* Safari NodeID */
#define IMAP_NID_SHIFT 21
#define IMAP_IGN 0x000007c0UL /* IRQ Group Number */
#define IMAP_INO 0x0000003fUL /* IRQ Number */
#define IMAP_INR 0x000007ffUL /* Full interrupt number*/
#define ICLR_IDLE 0x00000000UL /* Idle state */
#define ICLR_TRANSMIT 0x00000001UL /* Transmit state */
#define ICLR_PENDING 0x00000003UL /* Pending state */
/* The largest number of unique interrupt sources we support.
* If this needs to ever be larger than 255, you need to change
* the type of ino_bucket->virt_irq as appropriate.
*
* ino_bucket->virt_irq allocation is made during {sun4v_,}build_irq().
*/
#define NR_IRQS 255
extern void irq_install_pre_handler(int virt_irq,
void (*func)(unsigned int, void *, void *),
void *arg1, void *arg2);
#define irq_canonicalize(irq) (irq)
extern unsigned int build_irq(int inofixup, unsigned long iclr, unsigned long imap);
extern unsigned int sun4v_build_irq(u32 devhandle, unsigned int devino);
extern unsigned int sun4v_build_virq(u32 devhandle, unsigned int devino);
extern unsigned int sun4v_build_msi(u32 devhandle, unsigned int *virt_irq_p,
unsigned int msi_devino_start,
unsigned int msi_devino_end);
extern void sun4v_destroy_msi(unsigned int virt_irq);
extern unsigned int sbus_build_irq(void *sbus, unsigned int ino);
extern void sparc64_set_msi(unsigned int virt_irq, u32 msi);
extern u32 sparc64_get_msi(unsigned int virt_irq);
extern void fixup_irqs(void);
static __inline__ void set_softint(unsigned long bits)
{
__asm__ __volatile__("wr %0, 0x0, %%set_softint"
: /* No outputs */
: "r" (bits));
}
static __inline__ void clear_softint(unsigned long bits)
{
__asm__ __volatile__("wr %0, 0x0, %%clear_softint"
: /* No outputs */
: "r" (bits));
}
static __inline__ unsigned long get_softint(void)
{
unsigned long retval;
__asm__ __volatile__("rd %%softint, %0"
: "=r" (retval));
return retval;
}
#endif