diff options
Diffstat (limited to 'arch/mips/kernel/pica.S')
| -rw-r--r-- | arch/mips/kernel/pica.S | 252 |
1 files changed, 252 insertions, 0 deletions
diff --git a/arch/mips/kernel/pica.S b/arch/mips/kernel/pica.S new file mode 100644 index 000000000..036aa3139 --- /dev/null +++ b/arch/mips/kernel/pica.S @@ -0,0 +1,252 @@ +/* + * arch/mips/kernel/pica.S + * + * Copyright (C) 1995 Waldorf Electronics + * written by Ralf Baechle and Andreas Busse + * + * Acer PICA 61 specific stuff + */ +#include <asm/asm.h> +#include <asm/mipsregs.h> +#include <asm/jazz.h> +#include <asm/pica.h> +#include <asm/stackframe.h> + +/* + * acer_pica_61_handle_int: Interrupt handler for the ACER Pica-61 boards + * FIXME: this is *very* experimental! + */ + .set noreorder + + NESTED(acer_pica_61_handle_int, FR_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,spurious_interrupt + 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(acer_pica_61_handle_int) + +/* + * Used for keyboard driver's fake_keyboard_interrupt() + */ +ll_sw0: li s1,~IE_SW0 + mfc0 t0,CP0_CAUSE + and t0,s1 + mtc0 t0,CP0_CAUSE + PRINT("sw0 received...\n") + li t1,1 + b call_real + li t3,PTRSIZE # delay slot, re-map to irq level 1 + +ll_sw1: li s1,~IE_SW1 + 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 __mips == 3 + dsll t0,1 + ld t0,local_vector(t0) +#else /* 32 bit */ + lw t0,local_vector(t0) +#endif + jr t0 + nop + + +loc_no_irq: PANIC("Unimplemented loc_no_irq handler") +/* + * Parallel port IRQ, remapped to level 5 + */ +loc_parallel: li s1,~JAZZ_IE_PARALLEL + li t1,JAZZ_PARALLEL_IRQ + b loc_call + li t3,PTRSIZE*JAZZ_PARALLEL_IRQ # delay slot + +/* + * Floppy IRQ, remapped to level 6 + */ +loc_floppy: li s1,~JAZZ_IE_FLOPPY + li t1,JAZZ_FLOPPY_IRQ + b loc_call + li t3,PTRSIZE*JAZZ_FLOPPY_IRQ # delay slot + +/* + * Now call the real handler + */ +loc_call: lui s3,%hi(intr_count) + lw t2,%lo(intr_count)(s3) + la t0,IRQ_vectors # delay slot + addiu t2,1 + sw t2,%lo(intr_count)(s3) + + /* + * Temporarily disable interrupt source + */ + lhu t2,JAZZ_IO_IRQ_ENABLE + addu t0,t3 # make ptr to IRQ handler + lw t0,(t0) + and t2,s1 # delay slot + sh t2,JAZZ_IO_IRQ_ENABLE + jalr t0 # call IRQ handler + nor s1,zero,s1 # delay slot + + /* + * Reenable interrupt + */ + lhu t2,JAZZ_IO_IRQ_ENABLE + lw t1,%lo(intr_count)(s3) # delay slot + or t2,s1 + sh t2,JAZZ_IO_IRQ_ENABLE + + subu t1,1 + jr v0 + sw t1,%lo(intr_count)(s3) # delay slot + +ll_isa_irq: li s1,~IE_IRQ2 + PANIC("Unimplemented isa_irq handler") + +ll_isa_nmi: li s1,~IE_IRQ3 + PANIC("Unimplemented isa_nmi handler") + +/* + * Timer IRQ + * We remap the timer irq to be more similar to an IBM compatible + */ +ll_timer: lw zero,JAZZ_TIMER_REGISTER # timer irq cleared on read + li s1,~IE_IRQ4 + li t1,0 + b call_real + li t3,0 # delay slot, re-map to irq level 0 + +/* + * CPU count/compare IRQ (unused) + */ +ll_count: j return + mtc0 zero,CP0_COMPARE + +/* + * Now call the real handler + */ +call_real: lui s3,%hi(intr_count) + lw t2,%lo(intr_count)(s3) + la t0,IRQ_vectors + addiu t2,1 + sw t2,%lo(intr_count)(s3) + + /* + * temporarily disable interrupt + */ + mfc0 t2,CP0_STATUS + and t2,s1 + + addu t0,t3 + lw t0,(t0) + mtc0 t2,CP0_STATUS # delay slot + jalr t0 + nor s1,zero,s1 # delay slot + + /* + * reenable interrupt + */ + mfc0 t2,CP0_STATUS + or t2,s1 + mtc0 t2,CP0_STATUS + + lw t2,%lo(intr_count)(s3) + subu t2,1 + + jr v0 + sw t2,%lo(intr_count)(s3) + + .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 + + +/* + * Sound? What sound hardware (whistle) ??? + */ +loc_sound: PANIC("Unimplemented loc_sound handler") +loc_video: PANIC("Unimplemented loc_video handler") + +/* + * Ethernet interrupt handler, remapped to level 2 + */ +loc_ethernet: li s1,~JAZZ_IE_ETHERNET + li t1,JAZZ_ETHERNET_IRQ + b loc_call + li t3,PTRSIZE*JAZZ_ETHERNET_IRQ # delay slot + +loc_scsi: PANIC("Unimplemented loc_scsi handler") + +/* + * Keyboard interrupt handler + */ +loc_keyboard: li s1,~JAZZ_IE_KEYBOARD + li t1,JAZZ_KEYBOARD_IRQ + b loc_call + li t3,PTRSIZE*JAZZ_KEYBOARD_IRQ # re-map to irq level 1 + +loc_mouse: PANIC("Unimplemented loc_mouse handler") + +/* + * Serial port 1 IRQ, remapped to level 3 + */ +loc_serial1: li s1,~JAZZ_IE_SERIAL1 + li t1,JAZZ_SERIAL1_IRQ + b loc_call + li t3,PTRSIZE*JAZZ_SERIAL1_IRQ # delay slot + +/* + * Serial port 2 IRQ, remapped to level 4 + */ +loc_serial2: li s1,~JAZZ_IE_SERIAL2 + li t1,JAZZ_SERIAL2_IRQ + b loc_call + li t3,PTRSIZE*JAZZ_SERIAL2_IRQ # delay slot + +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 |