+++ /dev/null
-/*
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- *
- * Copyright (C) 1995, 1996, 1997, 1998 by Ralf Baechle and Andreas Busse
- *
- * Jazz family specific interrupt stuff
- *
- * To do: On Jazz machines we remap some non-ISA interrupts to ISA
- * interrupts. These interrupts should use their own vectors.
- * Squeeze the last cycles out of the handlers. Only a dead
- * cycle is a good cycle.
- */
-#include <asm/asm.h>
-#include <asm/mipsregs.h>
-#include <asm/jazz.h>
-#include <asm/regdef.h>
-#include <asm/stackframe.h>
-
-/*
- * jazz_handle_int: Interrupt handler for the ACER Pica-61 boards
- */
- .set noreorder
-
- NESTED(jazz_handle_int, PT_SIZE, ra)
- .set noat
- SAVE_ALL
- CLI
- .set at
-
- /*
- * Get pending interrupts
- */
- mfc0 t0,CP0_CAUSE # get pending interrupts
- mfc0 t1,CP0_STATUS # get enabled interrupts
- and t0,t1 # isolate allowed ones
- andi t0,0xff00 # isolate pending bits
- beqz t0,3f
- sll t0,16 # delay slot
-
- /*
- * Find irq with highest priority
- * FIXME: This is slow - use binary search
- */
- la t1,ll_vectors
-1: bltz t0,2f # found pending irq
- sll t0,1
- b 1b
- subu t1,PTRSIZE # delay slot
-
- /*
- * Do the low-level stuff
- */
-2: lw t0,(t1)
- jr t0
- nop # delay slot
- END(jazz_handle_int)
-
-ll_sw0: li s1,~IE_SW0
- mfc0 t0,CP0_CAUSE
- and t0,s1
- mtc0 t0,CP0_CAUSE
- PANIC("Unimplemented sw0 handler")
-
-ll_sw1: li s1,~IE_SW1
- mfc0 t0,CP0_CAUSE
- and t0,s1
- mtc0 t0,CP0_CAUSE
- PANIC("Unimplemented sw1 handler")
-
-ll_local_dma: li s1,~IE_IRQ0
- PANIC("Unimplemented local_dma handler")
-
-ll_local_dev: lbu t0,JAZZ_IO_IRQ_SOURCE
-#if PTRSIZE == 8 /* True 64 bit kernel */
- dsll t0,1
-#endif
- .set reorder
- LONG_L t0,local_vector(t0)
- jr t0
- .set noreorder
-
-/*
- * The braindead PICA hardware gives us no way to distinguish if we really
- * received interrupt 7 from the (E)ISA bus or if we just received an
- * interrupt with no findable cause. This sometimes happens with braindead
- * cards. Oh well - for all the Jazz boxes slots are more or less just
- * whistles and bells and we're aware of the problem.
- */
-ll_isa_irq: lw a0, JAZZ_EISA_IRQ_ACK
-
- jal do_IRQ
- move a1,sp
-
- j ret_from_irq
- nop
-
-/*
- * Hmm... This is not just a plain PC clone so the question is
- * which devices on Jazz machines can generate an (E)ISA NMI?
- * (Writing to nonexistent memory?)
- */
-ll_isa_nmi: li s1,~IE_IRQ3
- PANIC("Unimplemented isa_nmi handler")
-
-/*
- * Timer IRQ - remapped to be more similar to an IBM compatible.
- *
- * The timer interrupt is handled specially to ensure that the jiffies
- * variable is updated at all times. Specifically, the timer interrupt is
- * just like the complete handlers except that it is invoked with interrupts
- * disabled and should never re-enable them. If other interrupts were
- * allowed to be processed while the timer interrupt is active, then the
- * other interrupts would have to avoid using the jiffies variable for delay
- * and interval timing operations to avoid hanging the system.
- */
-ll_timer: lw zero,JAZZ_TIMER_REGISTER # timer irq cleared on read
- li s1,~IE_IRQ4
-
- li a0, JAZZ_TIMER_IRQ
- jal do_IRQ
- move a1,sp
-
- mfc0 t0,CP0_STATUS # disable interrupts again
- ori t0,1
- xori t0,1
- mtc0 t0,CP0_STATUS
-
- j ret_from_irq
- nop
-
-/*
- * CPU count/compare IRQ (unused)
- */
-ll_count: j ret_from_irq
- mtc0 zero,CP0_COMPARE
-
-#if 0
-/*
- * Call the handler for the interrupt
- * (Currently unused)
- */
-call_real: /*
- * temporarily disable interrupt
- */
- mfc0 t2,CP0_STATUS
- and t2,s1
- mtc0 t2,CP0_STATUS
- nor s1,zero,s1
- jal do_IRQ
-
- /*
- * reenable interrupt
- */
- mfc0 t2,CP0_STATUS
- or t2,s1
- mtc0 t2,CP0_STATUS
- j ret_from_irq
-#endif
-
- .data
- PTR ll_sw0 # SW0
- PTR ll_sw1 # SW1
- PTR ll_local_dma # Local DMA
- PTR ll_local_dev # Local devices
- PTR ll_isa_irq # ISA IRQ
- PTR ll_isa_nmi # ISA NMI
- PTR ll_timer # Timer
-ll_vectors: PTR ll_count # Count/Compare IRQ
-
- /*
- * Interrupt handlers for local devices.
- */
- .text
- .set reorder
-loc_no_irq: PANIC("Unimplemented loc_no_irq handler")
-/*
- * Parallel port IRQ
- */
-loc_parallel: li s1,~JAZZ_IE_PARALLEL
- li a0,JAZZ_PARALLEL_IRQ
- b loc_call
-
-/*
- * Floppy IRQ
- */
-loc_floppy: li s1,~JAZZ_IE_FLOPPY
- li a0,JAZZ_FLOPPY_IRQ
- b loc_call
-
-/*
- * Sound IRQ
- */
-loc_sound: PANIC("Unimplemented loc_sound handler")
-loc_video: PANIC("Unimplemented loc_video handler")
-
-/*
- * Ethernet interrupt handler
- */
-loc_ethernet: li s1,~JAZZ_IE_ETHERNET
- li a0,JAZZ_ETHERNET_IRQ
- b loc_call
-
-/*
- * SCSI interrupt handler
- */
-loc_scsi: li s1,~JAZZ_IE_SCSI
- li a0,JAZZ_SCSI_IRQ
- b loc_call
-
-/*
- * Keyboard interrupt handler
- */
-loc_keyboard: li s1,~JAZZ_IE_KEYBOARD
- li a0,JAZZ_KEYBOARD_IRQ
- b loc_call
-
-/*
- * Mouse interrupt handler
- */
-loc_mouse: li s1,~JAZZ_IE_MOUSE
- li a0,JAZZ_MOUSE_IRQ
- b loc_call
-
-/*
- * Serial port 1 IRQ
- */
-loc_serial1: li s1,~JAZZ_IE_SERIAL1
- li a0,JAZZ_SERIAL1_IRQ
- b loc_call
-
-/*
- * Serial port 2 IRQ
- */
-loc_serial2: li s1,~JAZZ_IE_SERIAL2
- li a0,JAZZ_SERIAL2_IRQ
- b loc_call
-
-/*
- * Call the interrupt handler for an interrupt generated by a
- * local device.
- */
-loc_call: /*
- * Temporarily disable interrupt source
- */
- lhu t2,JAZZ_IO_IRQ_ENABLE
- and t2,s1
- sh t2,JAZZ_IO_IRQ_ENABLE
-
- nor s1,zero,s1
- jal do_IRQ
-
- /*
- * Reenable interrupt
- */
- lhu t2,JAZZ_IO_IRQ_ENABLE
- or t2,s1
- sh t2,JAZZ_IO_IRQ_ENABLE
-
- j ret_from_irq
-
-/*
- * "Jump extender" to reach spurious_interrupt
- */
-3: jal spurious_interrupt
- j ret_from_irq
-
-/*
- * Vectors for interrupts generated by local devices
- */
- .data
-local_vector: PTR loc_no_irq
- PTR loc_parallel
- PTR loc_floppy
- PTR loc_sound
- PTR loc_video
- PTR loc_ethernet
- PTR loc_scsi
- PTR loc_keyboard
- PTR loc_mouse
- PTR loc_serial1
- PTR loc_serial2
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff