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283 lines
5.7 KiB
283 lines
5.7 KiB
20 years ago
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/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1995, 1996, 1997, 1998 by Ralf Baechle and Andreas Busse
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*
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* Jazz family specific interrupt stuff
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*
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* To do: On Jazz machines we remap some non-ISA interrupts to ISA
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* interrupts. These interrupts should use their own vectors.
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* Squeeze the last cycles out of the handlers. Only a dead
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* cycle is a good cycle.
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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/jazz.h>
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#include <asm/regdef.h>
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#include <asm/stackframe.h>
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/*
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* jazz_handle_int: Interrupt handler for the ACER Pica-61 boards
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*/
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.set noreorder
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NESTED(jazz_handle_int, PT_SIZE, ra)
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.set noat
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SAVE_ALL
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CLI
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.set at
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/*
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* Get pending interrupts
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*/
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mfc0 t0,CP0_CAUSE # get pending interrupts
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mfc0 t1,CP0_STATUS # get enabled interrupts
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and t0,t1 # isolate allowed ones
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andi t0,0xff00 # isolate pending bits
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beqz t0,3f
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sll t0,16 # delay slot
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/*
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* Find irq with highest priority
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* FIXME: This is slow - use binary search
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*/
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la t1,ll_vectors
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1: bltz t0,2f # found pending irq
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sll t0,1
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b 1b
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subu t1,PTRSIZE # delay slot
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/*
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* Do the low-level stuff
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*/
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2: lw t0,(t1)
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jr t0
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nop # delay slot
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END(jazz_handle_int)
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ll_sw0: li s1,~IE_SW0
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mfc0 t0,CP0_CAUSE
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and t0,s1
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mtc0 t0,CP0_CAUSE
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PANIC("Unimplemented sw0 handler")
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ll_sw1: li s1,~IE_SW1
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mfc0 t0,CP0_CAUSE
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and t0,s1
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mtc0 t0,CP0_CAUSE
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PANIC("Unimplemented sw1 handler")
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ll_local_dma: li s1,~IE_IRQ0
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PANIC("Unimplemented local_dma handler")
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ll_local_dev: lbu t0,JAZZ_IO_IRQ_SOURCE
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#if PTRSIZE == 8 /* True 64 bit kernel */
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dsll t0,1
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#endif
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.set reorder
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LONG_L t0,local_vector(t0)
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jr t0
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.set noreorder
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/*
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* The braindead PICA hardware gives us no way to distinguish if we really
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* received interrupt 7 from the (E)ISA bus or if we just received an
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* interrupt with no findable cause. This sometimes happens with braindead
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* cards. Oh well - for all the Jazz boxes slots are more or less just
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* whistles and bells and we're aware of the problem.
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*/
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ll_isa_irq: lw a0, JAZZ_EISA_IRQ_ACK
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jal do_IRQ
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move a1,sp
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j ret_from_irq
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nop
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/*
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* Hmm... This is not just a plain PC clone so the question is
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* which devices on Jazz machines can generate an (E)ISA NMI?
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* (Writing to nonexistent memory?)
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*/
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ll_isa_nmi: li s1,~IE_IRQ3
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PANIC("Unimplemented isa_nmi handler")
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/*
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* Timer IRQ - remapped to be more similar to an IBM compatible.
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*
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* The timer interrupt is handled specially to ensure that the jiffies
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* variable is updated at all times. Specifically, the timer interrupt is
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* just like the complete handlers except that it is invoked with interrupts
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* disabled and should never re-enable them. If other interrupts were
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* allowed to be processed while the timer interrupt is active, then the
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* other interrupts would have to avoid using the jiffies variable for delay
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* and interval timing operations to avoid hanging the system.
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*/
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ll_timer: lw zero,JAZZ_TIMER_REGISTER # timer irq cleared on read
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li s1,~IE_IRQ4
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li a0, JAZZ_TIMER_IRQ
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jal do_IRQ
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move a1,sp
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mfc0 t0,CP0_STATUS # disable interrupts again
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ori t0,1
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xori t0,1
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mtc0 t0,CP0_STATUS
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j ret_from_irq
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nop
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/*
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* CPU count/compare IRQ (unused)
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*/
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ll_count: j ret_from_irq
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mtc0 zero,CP0_COMPARE
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#if 0
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/*
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* Call the handler for the interrupt
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* (Currently unused)
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*/
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call_real: /*
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* temporarily disable interrupt
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*/
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mfc0 t2,CP0_STATUS
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and t2,s1
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mtc0 t2,CP0_STATUS
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nor s1,zero,s1
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jal do_IRQ
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/*
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* reenable interrupt
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*/
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mfc0 t2,CP0_STATUS
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or t2,s1
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mtc0 t2,CP0_STATUS
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j ret_from_irq
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#endif
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.data
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PTR ll_sw0 # SW0
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PTR ll_sw1 # SW1
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PTR ll_local_dma # Local DMA
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PTR ll_local_dev # Local devices
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PTR ll_isa_irq # ISA IRQ
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PTR ll_isa_nmi # ISA NMI
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PTR ll_timer # Timer
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ll_vectors: PTR ll_count # Count/Compare IRQ
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/*
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* Interrupt handlers for local devices.
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*/
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.text
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.set reorder
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loc_no_irq: PANIC("Unimplemented loc_no_irq handler")
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/*
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* Parallel port IRQ
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*/
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loc_parallel: li s1,~JAZZ_IE_PARALLEL
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li a0,JAZZ_PARALLEL_IRQ
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b loc_call
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/*
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* Floppy IRQ
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*/
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loc_floppy: li s1,~JAZZ_IE_FLOPPY
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li a0,JAZZ_FLOPPY_IRQ
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b loc_call
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/*
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* Sound IRQ
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*/
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loc_sound: PANIC("Unimplemented loc_sound handler")
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loc_video: PANIC("Unimplemented loc_video handler")
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/*
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* Ethernet interrupt handler
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*/
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loc_ethernet: li s1,~JAZZ_IE_ETHERNET
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li a0,JAZZ_ETHERNET_IRQ
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b loc_call
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/*
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* SCSI interrupt handler
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*/
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loc_scsi: li s1,~JAZZ_IE_SCSI
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li a0,JAZZ_SCSI_IRQ
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b loc_call
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/*
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* Keyboard interrupt handler
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*/
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loc_keyboard: li s1,~JAZZ_IE_KEYBOARD
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li a0,JAZZ_KEYBOARD_IRQ
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b loc_call
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/*
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* Mouse interrupt handler
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*/
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loc_mouse: li s1,~JAZZ_IE_MOUSE
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li a0,JAZZ_MOUSE_IRQ
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b loc_call
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/*
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* Serial port 1 IRQ
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*/
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loc_serial1: li s1,~JAZZ_IE_SERIAL1
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li a0,JAZZ_SERIAL1_IRQ
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b loc_call
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/*
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* Serial port 2 IRQ
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*/
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loc_serial2: li s1,~JAZZ_IE_SERIAL2
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li a0,JAZZ_SERIAL2_IRQ
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b loc_call
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/*
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* Call the interrupt handler for an interrupt generated by a
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* local device.
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*/
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loc_call: /*
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* Temporarily disable interrupt source
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*/
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lhu t2,JAZZ_IO_IRQ_ENABLE
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and t2,s1
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sh t2,JAZZ_IO_IRQ_ENABLE
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nor s1,zero,s1
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jal do_IRQ
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/*
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* Reenable interrupt
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*/
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lhu t2,JAZZ_IO_IRQ_ENABLE
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or t2,s1
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sh t2,JAZZ_IO_IRQ_ENABLE
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j ret_from_irq
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/*
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* "Jump extender" to reach spurious_interrupt
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*/
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3: j spurious_interrupt
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/*
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* Vectors for interrupts generated by local devices
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*/
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.data
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local_vector: PTR loc_no_irq
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PTR loc_parallel
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PTR loc_floppy
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PTR loc_sound
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PTR loc_video
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PTR loc_ethernet
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PTR loc_scsi
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PTR loc_keyboard
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PTR loc_mouse
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PTR loc_serial1
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PTR loc_serial2
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