diff options
Diffstat (limited to 'arch/mips/sgi-ip22/ip22-int.c')
| -rw-r--r-- | arch/mips/sgi-ip22/ip22-int.c | 45 |
1 files changed, 25 insertions, 20 deletions
diff --git a/arch/mips/sgi-ip22/ip22-int.c b/arch/mips/sgi-ip22/ip22-int.c index 3f2b7633f94..c66889fc491 100644 --- a/arch/mips/sgi-ip22/ip22-int.c +++ b/arch/mips/sgi-ip22/ip22-int.c @@ -1,12 +1,12 @@ /* * ip22-int.c: Routines for generic manipulation of the INT[23] ASIC - * found on INDY and Indigo2 workstations. + * found on INDY and Indigo2 workstations. * * Copyright (C) 1996 David S. Miller (davem@davemloft.net) * Copyright (C) 1997, 1998 Ralf Baechle (ralf@gnu.org) * Copyright (C) 1999 Andrew R. Baker (andrewb@uab.edu) - * - Indigo2 changes - * - Interrupt handling fixes + * - Indigo2 changes + * - Interrupt handling fixes * Copyright (C) 2001, 2003 Ladislav Michl (ladis@linux-mips.org) */ #include <linux/types.h> @@ -119,9 +119,14 @@ static void indy_local0_irqdispatch(void) } else irq = lc0msk_to_irqnr[mask]; - /* if irq == 0, then the interrupt has already been cleared */ + /* + * workaround for INT2 bug; if irq == 0, INT2 has seen a fifo full + * irq, but failed to latch it into status register + */ if (irq) do_IRQ(irq); + else + do_IRQ(SGINT_LOCAL0 + 0); } static void indy_local1_irqdispatch(void) @@ -148,7 +153,7 @@ static void __irq_entry indy_buserror_irq(void) int irq = SGI_BUSERR_IRQ; irq_enter(); - kstat_incr_irqs_this_cpu(irq, irq_to_desc(irq)); + kstat_incr_irq_this_cpu(irq); ip22_be_interrupt(irq); irq_exit(); } @@ -195,24 +200,24 @@ extern void indy_8254timer_irq(void); * at all) like: * * MIPS IRQ Source - * -------- ------ - * 0 Software (ignored) - * 1 Software (ignored) - * 2 Local IRQ level zero - * 3 Local IRQ level one - * 4 8254 Timer zero - * 5 8254 Timer one - * 6 Bus Error - * 7 R4k timer (what we use) + * -------- ------ + * 0 Software (ignored) + * 1 Software (ignored) + * 2 Local IRQ level zero + * 3 Local IRQ level one + * 4 8254 Timer zero + * 5 8254 Timer one + * 6 Bus Error + * 7 R4k timer (what we use) * * We handle the IRQ according to _our_ priority which is: * - * Highest ---- R4k Timer - * Local IRQ zero - * Local IRQ one - * Bus Error - * 8254 Timer zero - * Lowest ---- 8254 Timer one + * Highest ---- R4k Timer + * Local IRQ zero + * Local IRQ one + * Bus Error + * 8254 Timer zero + * Lowest ---- 8254 Timer one * * then we just return, if multiple IRQs are pending then we will just take * another exception, big deal. |