2005-04-17 06:20:36 +08:00
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/*
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* ip22-int.c: Routines for generic manipulation of the INT[23] ASIC
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* found on INDY and Indigo2 workstations.
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*
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* Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
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* Copyright (C) 1997, 1998 Ralf Baechle (ralf@gnu.org)
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* Copyright (C) 1999 Andrew R. Baker (andrewb@uab.edu)
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* - Indigo2 changes
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* - Interrupt handling fixes
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* Copyright (C) 2001, 2003 Ladislav Michl (ladis@linux-mips.org)
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*/
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#include <linux/config.h>
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/kernel_stat.h>
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <asm/mipsregs.h>
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#include <asm/addrspace.h>
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#include <asm/sgi/ioc.h>
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#include <asm/sgi/hpc3.h>
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#include <asm/sgi/ip22.h>
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/* #define DEBUG_SGINT */
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/* So far nothing hangs here */
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2005-09-04 06:56:17 +08:00
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#undef USE_LIO3_IRQ
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2005-04-17 06:20:36 +08:00
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struct sgint_regs *sgint;
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static char lc0msk_to_irqnr[256];
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static char lc1msk_to_irqnr[256];
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static char lc2msk_to_irqnr[256];
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static char lc3msk_to_irqnr[256];
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extern int ip22_eisa_init(void);
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static void enable_local0_irq(unsigned int irq)
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{
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unsigned long flags;
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local_irq_save(flags);
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/* don't allow mappable interrupt to be enabled from setup_irq,
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* we have our own way to do so */
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if (irq != SGI_MAP_0_IRQ)
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sgint->imask0 |= (1 << (irq - SGINT_LOCAL0));
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local_irq_restore(flags);
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}
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static unsigned int startup_local0_irq(unsigned int irq)
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{
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enable_local0_irq(irq);
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return 0; /* Never anything pending */
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}
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static void disable_local0_irq(unsigned int irq)
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{
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unsigned long flags;
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local_irq_save(flags);
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sgint->imask0 &= ~(1 << (irq - SGINT_LOCAL0));
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local_irq_restore(flags);
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}
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#define shutdown_local0_irq disable_local0_irq
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#define mask_and_ack_local0_irq disable_local0_irq
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static void end_local0_irq (unsigned int irq)
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{
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if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
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enable_local0_irq(irq);
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}
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static struct hw_interrupt_type ip22_local0_irq_type = {
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.typename = "IP22 local 0",
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.startup = startup_local0_irq,
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.shutdown = shutdown_local0_irq,
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.enable = enable_local0_irq,
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.disable = disable_local0_irq,
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.ack = mask_and_ack_local0_irq,
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.end = end_local0_irq,
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};
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static void enable_local1_irq(unsigned int irq)
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{
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unsigned long flags;
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local_irq_save(flags);
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/* don't allow mappable interrupt to be enabled from setup_irq,
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* we have our own way to do so */
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if (irq != SGI_MAP_1_IRQ)
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sgint->imask1 |= (1 << (irq - SGINT_LOCAL1));
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local_irq_restore(flags);
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}
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static unsigned int startup_local1_irq(unsigned int irq)
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{
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enable_local1_irq(irq);
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return 0; /* Never anything pending */
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}
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void disable_local1_irq(unsigned int irq)
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{
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unsigned long flags;
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local_irq_save(flags);
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sgint->imask1 &= ~(1 << (irq - SGINT_LOCAL1));
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local_irq_restore(flags);
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}
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#define shutdown_local1_irq disable_local1_irq
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#define mask_and_ack_local1_irq disable_local1_irq
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static void end_local1_irq (unsigned int irq)
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{
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if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
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enable_local1_irq(irq);
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}
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static struct hw_interrupt_type ip22_local1_irq_type = {
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.typename = "IP22 local 1",
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.startup = startup_local1_irq,
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.shutdown = shutdown_local1_irq,
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.enable = enable_local1_irq,
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.disable = disable_local1_irq,
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.ack = mask_and_ack_local1_irq,
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.end = end_local1_irq,
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};
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static void enable_local2_irq(unsigned int irq)
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{
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unsigned long flags;
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local_irq_save(flags);
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sgint->imask0 |= (1 << (SGI_MAP_0_IRQ - SGINT_LOCAL0));
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sgint->cmeimask0 |= (1 << (irq - SGINT_LOCAL2));
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local_irq_restore(flags);
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}
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static unsigned int startup_local2_irq(unsigned int irq)
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{
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enable_local2_irq(irq);
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return 0; /* Never anything pending */
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}
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void disable_local2_irq(unsigned int irq)
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{
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unsigned long flags;
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local_irq_save(flags);
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sgint->cmeimask0 &= ~(1 << (irq - SGINT_LOCAL2));
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if (!sgint->cmeimask0)
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sgint->imask0 &= ~(1 << (SGI_MAP_0_IRQ - SGINT_LOCAL0));
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local_irq_restore(flags);
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}
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#define shutdown_local2_irq disable_local2_irq
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#define mask_and_ack_local2_irq disable_local2_irq
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static void end_local2_irq (unsigned int irq)
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{
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if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
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enable_local2_irq(irq);
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}
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static struct hw_interrupt_type ip22_local2_irq_type = {
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.typename = "IP22 local 2",
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.startup = startup_local2_irq,
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.shutdown = shutdown_local2_irq,
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.enable = enable_local2_irq,
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.disable = disable_local2_irq,
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.ack = mask_and_ack_local2_irq,
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.end = end_local2_irq,
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};
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static void enable_local3_irq(unsigned int irq)
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{
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unsigned long flags;
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local_irq_save(flags);
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sgint->imask1 |= (1 << (SGI_MAP_1_IRQ - SGINT_LOCAL1));
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sgint->cmeimask1 |= (1 << (irq - SGINT_LOCAL3));
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local_irq_restore(flags);
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}
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static unsigned int startup_local3_irq(unsigned int irq)
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{
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enable_local3_irq(irq);
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return 0; /* Never anything pending */
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}
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void disable_local3_irq(unsigned int irq)
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{
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unsigned long flags;
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local_irq_save(flags);
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sgint->cmeimask1 &= ~(1 << (irq - SGINT_LOCAL3));
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if (!sgint->cmeimask1)
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sgint->imask1 &= ~(1 << (SGI_MAP_1_IRQ - SGINT_LOCAL1));
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local_irq_restore(flags);
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}
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#define shutdown_local3_irq disable_local3_irq
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#define mask_and_ack_local3_irq disable_local3_irq
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static void end_local3_irq (unsigned int irq)
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{
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if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
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enable_local3_irq(irq);
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}
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static struct hw_interrupt_type ip22_local3_irq_type = {
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.typename = "IP22 local 3",
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.startup = startup_local3_irq,
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.shutdown = shutdown_local3_irq,
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.enable = enable_local3_irq,
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.disable = disable_local3_irq,
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.ack = mask_and_ack_local3_irq,
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.end = end_local3_irq,
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};
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2006-04-04 00:56:36 +08:00
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static void indy_local0_irqdispatch(struct pt_regs *regs)
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2005-04-17 06:20:36 +08:00
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{
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u8 mask = sgint->istat0 & sgint->imask0;
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u8 mask2;
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int irq;
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if (mask & SGINT_ISTAT0_LIO2) {
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mask2 = sgint->vmeistat & sgint->cmeimask0;
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irq = lc2msk_to_irqnr[mask2];
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} else
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irq = lc0msk_to_irqnr[mask];
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/* if irq == 0, then the interrupt has already been cleared */
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if (irq)
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do_IRQ(irq, regs);
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return;
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}
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2006-04-04 00:56:36 +08:00
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static void indy_local1_irqdispatch(struct pt_regs *regs)
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2005-04-17 06:20:36 +08:00
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{
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u8 mask = sgint->istat1 & sgint->imask1;
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u8 mask2;
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int irq;
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if (mask & SGINT_ISTAT1_LIO3) {
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mask2 = sgint->vmeistat & sgint->cmeimask1;
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irq = lc3msk_to_irqnr[mask2];
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} else
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irq = lc1msk_to_irqnr[mask];
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/* if irq == 0, then the interrupt has already been cleared */
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if (irq)
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do_IRQ(irq, regs);
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return;
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}
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extern void ip22_be_interrupt(int irq, struct pt_regs *regs);
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2006-04-04 00:56:36 +08:00
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static void indy_buserror_irq(struct pt_regs *regs)
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2005-04-17 06:20:36 +08:00
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{
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int irq = SGI_BUSERR_IRQ;
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irq_enter();
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kstat_this_cpu.irqs[irq]++;
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ip22_be_interrupt(irq, regs);
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irq_exit();
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}
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2005-09-04 06:56:17 +08:00
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static struct irqaction local0_cascade = {
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2005-04-17 06:20:36 +08:00
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.handler = no_action,
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.flags = SA_INTERRUPT,
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.name = "local0 cascade",
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};
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2005-09-04 06:56:17 +08:00
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static struct irqaction local1_cascade = {
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2005-04-17 06:20:36 +08:00
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.handler = no_action,
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.flags = SA_INTERRUPT,
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.name = "local1 cascade",
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};
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2005-09-04 06:56:17 +08:00
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static struct irqaction buserr = {
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2005-04-17 06:20:36 +08:00
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.handler = no_action,
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.flags = SA_INTERRUPT,
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.name = "Bus Error",
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};
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2005-09-04 06:56:17 +08:00
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static struct irqaction map0_cascade = {
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2005-04-17 06:20:36 +08:00
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.handler = no_action,
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.flags = SA_INTERRUPT,
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.name = "mapable0 cascade",
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};
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#ifdef USE_LIO3_IRQ
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2005-09-04 06:56:17 +08:00
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static struct irqaction map1_cascade = {
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2005-04-17 06:20:36 +08:00
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.handler = no_action,
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.flags = SA_INTERRUPT,
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.name = "mapable1 cascade",
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};
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#define SGI_INTERRUPTS SGINT_END
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#else
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#define SGI_INTERRUPTS SGINT_LOCAL3
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#endif
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2006-04-04 00:56:36 +08:00
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extern void indy_r4k_timer_interrupt(struct pt_regs *regs);
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extern void indy_8254timer_irq(struct pt_regs *regs);
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/*
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* IRQs on the INDY look basically (barring software IRQs which we don't use
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* at all) like:
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*
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* MIPS IRQ Source
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* -------- ------
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* 0 Software (ignored)
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* 1 Software (ignored)
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* 2 Local IRQ level zero
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* 3 Local IRQ level one
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* 4 8254 Timer zero
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* 5 8254 Timer one
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* 6 Bus Error
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* 7 R4k timer (what we use)
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*
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* We handle the IRQ according to _our_ priority which is:
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*
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* Highest ---- R4k Timer
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* Local IRQ zero
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* Local IRQ one
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* Bus Error
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* 8254 Timer zero
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* Lowest ---- 8254 Timer one
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*
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* then we just return, if multiple IRQs are pending then we will just take
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* another exception, big deal.
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*/
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asmlinkage void plat_irq_dispatch(struct pt_regs *regs)
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{
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unsigned int pending = read_c0_cause();
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/*
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* First we check for r4k counter/timer IRQ.
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*/
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if (pending & CAUSEF_IP7)
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indy_r4k_timer_interrupt(regs);
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else if (pending & CAUSEF_IP2)
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indy_local0_irqdispatch(regs);
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else if (pending & CAUSEF_IP3)
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indy_local1_irqdispatch(regs);
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else if (pending & CAUSEF_IP6)
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indy_buserror_irq(regs);
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else if (pending & (CAUSEF_IP4 | CAUSEF_IP5))
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indy_8254timer_irq(regs);
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}
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2005-04-17 06:20:36 +08:00
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extern void mips_cpu_irq_init(unsigned int irq_base);
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void __init arch_init_irq(void)
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{
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int i;
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/* Init local mask --> irq tables. */
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for (i = 0; i < 256; i++) {
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if (i & 0x80) {
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lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 7;
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lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 7;
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lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 7;
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lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 7;
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} else if (i & 0x40) {
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lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 6;
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lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 6;
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lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 6;
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lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 6;
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} else if (i & 0x20) {
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lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 5;
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lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 5;
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lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 5;
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lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 5;
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} else if (i & 0x10) {
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lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 4;
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lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 4;
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lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 4;
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lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 4;
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} else if (i & 0x08) {
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lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 3;
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lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 3;
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lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 3;
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lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 3;
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} else if (i & 0x04) {
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lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 2;
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lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 2;
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lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 2;
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lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 2;
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} else if (i & 0x02) {
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lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 1;
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lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 1;
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lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 1;
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lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 1;
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} else if (i & 0x01) {
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lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 0;
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lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 0;
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lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 0;
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lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 0;
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} else {
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lc0msk_to_irqnr[i] = 0;
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lc1msk_to_irqnr[i] = 0;
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lc2msk_to_irqnr[i] = 0;
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lc3msk_to_irqnr[i] = 0;
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}
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}
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/* Mask out all interrupts. */
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sgint->imask0 = 0;
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sgint->imask1 = 0;
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sgint->cmeimask0 = 0;
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sgint->cmeimask1 = 0;
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/* init CPU irqs */
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mips_cpu_irq_init(SGINT_CPU);
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for (i = SGINT_LOCAL0; i < SGI_INTERRUPTS; i++) {
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hw_irq_controller *handler;
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if (i < SGINT_LOCAL1)
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handler = &ip22_local0_irq_type;
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else if (i < SGINT_LOCAL2)
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handler = &ip22_local1_irq_type;
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else if (i < SGINT_LOCAL3)
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handler = &ip22_local2_irq_type;
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else
|
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|
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handler = &ip22_local3_irq_type;
|
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|
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irq_desc[i].status = IRQ_DISABLED;
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|
|
irq_desc[i].action = 0;
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|
|
irq_desc[i].depth = 1;
|
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|
|
irq_desc[i].handler = handler;
|
|
|
|
}
|
|
|
|
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|
|
|
/* vector handler. this register the IRQ as non-sharable */
|
|
|
|
setup_irq(SGI_LOCAL_0_IRQ, &local0_cascade);
|
|
|
|
setup_irq(SGI_LOCAL_1_IRQ, &local1_cascade);
|
|
|
|
setup_irq(SGI_BUSERR_IRQ, &buserr);
|
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|
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|
|
|
/* cascade in cascade. i love Indy ;-) */
|
|
|
|
setup_irq(SGI_MAP_0_IRQ, &map0_cascade);
|
|
|
|
#ifdef USE_LIO3_IRQ
|
|
|
|
setup_irq(SGI_MAP_1_IRQ, &map1_cascade);
|
|
|
|
#endif
|
|
|
|
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|
|
|
#ifdef CONFIG_EISA
|
|
|
|
if (ip22_is_fullhouse()) /* Only Indigo-2 has EISA stuff */
|
|
|
|
ip22_eisa_init ();
|
|
|
|
#endif
|
|
|
|
}
|