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/*
* Carsten Langgaard, carstenl@mips.com
* Copyright (C) 2000, 2001, 2004 MIPS Technologies, Inc.
* Copyright (C) 2001 Ralf Baechle
*
* This program is free software; you can distribute it and/or modify it
* under the terms of the GNU General Public License (Version 2) as
* published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
*
* Routines for generic manipulation of the interrupts found on the MIPS
* Malta board.
* The interrupt controller is located in the South Bridge a PIIX4 device
* with two internal 82C95 interrupt controllers.
*/
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/kernel_stat.h>
#include <linux/random.h>
#include <asm/i8259.h>
#include <asm/io.h>
#include <asm/mips-boards/malta.h>
#include <asm/mips-boards/maltaint.h>
#include <asm/mips-boards/piix4.h>
#include <asm/gt64120.h>
#include <asm/mips-boards/generic.h>
#include <asm/mips-boards/msc01_pci.h>
extern asmlinkage void mipsIRQ(void);
static DEFINE_SPINLOCK(mips_irq_lock);
static inline int mips_pcibios_iack(void)
{
int irq;
u32 dummy;
/*
* Determine highest priority pending interrupt by performing
* a PCI Interrupt Acknowledge cycle.
*/
switch(mips_revision_corid) {
case MIPS_REVISION_CORID_CORE_MSC:
case MIPS_REVISION_CORID_CORE_FPGA2:
case MIPS_REVISION_CORID_CORE_EMUL_MSC:
MSC_READ(MSC01_PCI_IACK, irq);
irq &= 0xff;
break;
case MIPS_REVISION_CORID_QED_RM5261:
case MIPS_REVISION_CORID_CORE_LV:
case MIPS_REVISION_CORID_CORE_FPGA:
case MIPS_REVISION_CORID_CORE_FPGAR2:
irq = GT_READ(GT_PCI0_IACK_OFS);
irq &= 0xff;
break;
case MIPS_REVISION_CORID_BONITO64:
case MIPS_REVISION_CORID_CORE_20K:
case MIPS_REVISION_CORID_CORE_EMUL_BON:
/* The following will generate a PCI IACK cycle on the
* Bonito controller. It's a little bit kludgy, but it
* was the easiest way to implement it in hardware at
* the given time.
*/
BONITO_PCIMAP_CFG = 0x20000;
/* Flush Bonito register block */
dummy = BONITO_PCIMAP_CFG;
iob(); /* sync */
irq = *(volatile u32 *)(_pcictrl_bonito_pcicfg);
iob(); /* sync */
irq &= 0xff;
BONITO_PCIMAP_CFG = 0;
break;
default:
printk("Unknown Core card, don't know the system controller.\n");
return -1;
}
return irq;
}
static inline int get_int(int *irq)
{
unsigned long flags;
spin_lock_irqsave(&mips_irq_lock, flags);
*irq = mips_pcibios_iack();
/*
* IRQ7 is used to detect spurious interrupts.
* The interrupt acknowledge cycle returns IRQ7, if no
* interrupts is requested.
* We can differentiate between this situation and a
* "Normal" IRQ7 by reading the ISR.
*/
if (*irq == 7)
{
outb(PIIX4_OCW3_SEL | PIIX4_OCW3_ISR,
PIIX4_ICTLR1_OCW3);
if (!(inb(PIIX4_ICTLR1_OCW3) & (1 << 7))) {
spin_unlock_irqrestore(&mips_irq_lock, flags);
printk("We got a spurious interrupt from PIIX4.\n");
atomic_inc(&irq_err_count);
return -1; /* Spurious interrupt. */
}
}
spin_unlock_irqrestore(&mips_irq_lock, flags);
return 0;
}
void malta_hw0_irqdispatch(struct pt_regs *regs)
{
int irq;
if (get_int(&irq))
return; /* interrupt has already been cleared */
do_IRQ(irq, regs);
}
void corehi_irqdispatch(struct pt_regs *regs)
{
unsigned int data,datahi;
/* Mask out corehi interrupt. */
clear_c0_status(IE_IRQ3);
printk("CoreHI interrupt, shouldn't happen, so we die here!!!\n");
printk("epc : %08lx\nStatus: %08lx\nCause : %08lx\nbadVaddr : %08lx\n"
, regs->cp0_epc, regs->cp0_status, regs->cp0_cause, regs->cp0_badvaddr);
switch(mips_revision_corid) {
case MIPS_REVISION_CORID_CORE_MSC:
case MIPS_REVISION_CORID_CORE_FPGA2:
case MIPS_REVISION_CORID_CORE_EMUL_MSC:
break;
case MIPS_REVISION_CORID_QED_RM5261:
case MIPS_REVISION_CORID_CORE_LV:
case MIPS_REVISION_CORID_CORE_FPGA:
case MIPS_REVISION_CORID_CORE_FPGAR2:
data = GT_READ(GT_INTRCAUSE_OFS);
printk("GT_INTRCAUSE = %08x\n", data);
data = GT_READ(GT_CPUERR_ADDRLO_OFS);
datahi = GT_READ(GT_CPUERR_ADDRHI_OFS);
printk("GT_CPUERR_ADDR = %02x%08x\n", datahi, data);
break;
case MIPS_REVISION_CORID_BONITO64:
case MIPS_REVISION_CORID_CORE_20K:
case MIPS_REVISION_CORID_CORE_EMUL_BON:
data = BONITO_INTISR;
printk("BONITO_INTISR = %08x\n", data);
data = BONITO_INTEN;
printk("BONITO_INTEN = %08x\n", data);
data = BONITO_INTPOL;
printk("BONITO_INTPOL = %08x\n", data);
data = BONITO_INTEDGE;
printk("BONITO_INTEDGE = %08x\n", data);
data = BONITO_INTSTEER;
printk("BONITO_INTSTEER = %08x\n", data);
data = BONITO_PCICMD;
printk("BONITO_PCICMD = %08x\n", data);
break;
}
/* We die here*/
die("CoreHi interrupt", regs);
}
void __init arch_init_irq(void)
{
set_except_vector(0, mipsIRQ);
init_i8259_irqs();
}
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