diff options
Diffstat (limited to 'arch/mips/mips-boards/malta/malta_int.c')
| -rw-r--r-- | arch/mips/mips-boards/malta/malta_int.c | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/arch/mips/mips-boards/malta/malta_int.c b/arch/mips/mips-boards/malta/malta_int.c new file mode 100644 index 00000000000..dd2db35966b --- /dev/null +++ b/arch/mips/mips-boards/malta/malta_int.c @@ -0,0 +1,187 @@ +/* + * 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(); +} |