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106 lines
2.2 KiB
106 lines
2.2 KiB
/*
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* SNI RM200 PCI specific interrupt handler code.
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*
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* Copyright (C) 1994, 95, 96, 97, 98, 1999, 2000, 01 by Ralf Baechle
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*/
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#include <asm/asm.h>
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#include <asm/mipsregs.h>
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#include <asm/regdef.h>
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#include <asm/sni.h>
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#include <asm/stackframe.h>
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/*
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* The PCI ASIC has the nasty property that it may delay writes if it is busy.
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* As a consequence from writes that have not graduated when we exit from the
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* interrupt handler we might catch a spurious interrupt. To avoid this we
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* force the PCI ASIC to graduate all writes by executing a read from the
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* PCI bus.
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*/
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.set noreorder
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.set noat
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.align 5
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NESTED(sni_rm200_pci_handle_int, PT_SIZE, sp)
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SAVE_ALL
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CLI
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.set at
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/* Blinken light ... */
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lb t0, led_cache
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addiu t0, 1
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sb t0, led_cache
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sb t0, PCIMT_CSLED # write only register
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.data
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led_cache: .byte 0
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.text
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mfc0 t0, CP0_STATUS
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mfc0 t1, CP0_CAUSE
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and t0, t1
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andi t1, t0, 0x0800 # hardware interrupt 1
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bnez t1, _hwint1
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andi t1, t0, 0x4000 # hardware interrupt 4
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bnez t1, _hwint4
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andi t1, t0, 0x2000 # hardware interrupt 3
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bnez t1, _hwint3
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andi t1, t0, 0x1000 # hardware interrupt 2
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bnez t1, _hwint2
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andi t1, t0, 0x8000 # hardware interrupt 5
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bnez t1, _hwint5
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andi t1, t0, 0x0400 # hardware interrupt 0
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bnez t1, _hwint0
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nop
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j restore_all # spurious interrupt
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nop
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##############################################################################
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/* hwint0 should deal with MP agent, ASIC PCI, EISA NMI and debug
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button interrupts. */
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_hwint0: jal pciasic_hwint0
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move a0, sp
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j ret_from_irq
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nop
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/*
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* hwint 1 deals with EISA and SCSI interrupts
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*/
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_hwint1: jal pciasic_hwint1
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move a0, sp
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j ret_from_irq
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nop
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/*
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* This interrupt was used for the com1 console on the first prototypes;
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* it's unsed otherwise
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*/
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_hwint2: jal pciasic_hwint2
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move a0, sp
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j ret_from_irq
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nop
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/*
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* hwint 3 are the PCI interrupts A - D
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*/
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_hwint3: jal pciasic_hwint3
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move a0, sp
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j ret_from_irq
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nop
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/*
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* hwint 4 is used for only the onboard PCnet 32.
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*/
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_hwint4: jal pciasic_hwint4
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move a0, sp
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j ret_from_irq
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nop
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/* hwint5 is the r4k count / compare interrupt */
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_hwint5: jal pciasic_hwint5
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move a0, sp
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j ret_from_irq
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nop
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END(sni_rm200_pci_handle_int)
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