diff options
Diffstat (limited to 'arch/mips/sni/int-handler.S')
| -rw-r--r-- | arch/mips/sni/int-handler.S | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/arch/mips/sni/int-handler.S b/arch/mips/sni/int-handler.S new file mode 100644 index 00000000000..2cdc09f55f1 --- /dev/null +++ b/arch/mips/sni/int-handler.S @@ -0,0 +1,106 @@ +/* + * SNI RM200 PCI specific interrupt handler code. + * + * Copyright (C) 1994, 95, 96, 97, 98, 1999, 2000, 01 by Ralf Baechle + */ +#include <asm/asm.h> +#include <asm/mipsregs.h> +#include <asm/regdef.h> +#include <asm/sni.h> +#include <asm/stackframe.h> + +/* + * The PCI ASIC has the nasty property that it may delay writes if it is busy. + * As a consequence from writes that have not graduated when we exit from the + * interrupt handler we might catch a spurious interrupt. To avoid this we + * force the PCI ASIC to graduate all writes by executing a read from the + * PCI bus. + */ + .set noreorder + .set noat + .align 5 + NESTED(sni_rm200_pci_handle_int, PT_SIZE, sp) + SAVE_ALL + CLI + .set at + + /* Blinken light ... */ + lb t0, led_cache + addiu t0, 1 + sb t0, led_cache + sb t0, PCIMT_CSLED # write only register + .data +led_cache: .byte 0 + .text + + mfc0 t0, CP0_STATUS + mfc0 t1, CP0_CAUSE + and t0, t1 + + andi t1, t0, 0x0800 # hardware interrupt 1 + bnez t1, _hwint1 + andi t1, t0, 0x4000 # hardware interrupt 4 + bnez t1, _hwint4 + andi t1, t0, 0x2000 # hardware interrupt 3 + bnez t1, _hwint3 + andi t1, t0, 0x1000 # hardware interrupt 2 + bnez t1, _hwint2 + andi t1, t0, 0x8000 # hardware interrupt 5 + bnez t1, _hwint5 + andi t1, t0, 0x0400 # hardware interrupt 0 + bnez t1, _hwint0 + nop + + j restore_all # spurious interrupt + nop + + ############################################################################## + +/* hwint0 should deal with MP agent, ASIC PCI, EISA NMI and debug + button interrupts. */ +_hwint0: jal pciasic_hwint0 + move a0, sp + j ret_from_irq + nop + +/* + * hwint 1 deals with EISA and SCSI interrupts + */ +_hwint1: jal pciasic_hwint1 + move a0, sp + j ret_from_irq + nop + + +/* + * This interrupt was used for the com1 console on the first prototypes; + * it's unsed otherwise + */ +_hwint2: jal pciasic_hwint2 + move a0, sp + j ret_from_irq + nop + +/* + * hwint 3 are the PCI interrupts A - D + */ +_hwint3: jal pciasic_hwint3 + move a0, sp + j ret_from_irq + nop + +/* + * hwint 4 is used for only the onboard PCnet 32. + */ +_hwint4: jal pciasic_hwint4 + move a0, sp + j ret_from_irq + nop + +/* hwint5 is the r4k count / compare interrupt */ +_hwint5: jal pciasic_hwint5 + move a0, sp + j ret_from_irq + nop + + END(sni_rm200_pci_handle_int) |