110 lines
2.2 KiB
C
110 lines
2.2 KiB
C
/*
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* DEC I/O ASIC interrupts.
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*
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* Copyright (c) 2002, 2003 Maciej W. Rozycki
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/init.h>
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#include <linux/irq.h>
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#include <linux/types.h>
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#include <asm/dec/ioasic.h>
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#include <asm/dec/ioasic_addrs.h>
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#include <asm/dec/ioasic_ints.h>
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static int ioasic_irq_base;
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static inline void unmask_ioasic_irq(unsigned int irq)
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{
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u32 simr;
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simr = ioasic_read(IO_REG_SIMR);
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simr |= (1 << (irq - ioasic_irq_base));
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ioasic_write(IO_REG_SIMR, simr);
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}
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static inline void mask_ioasic_irq(unsigned int irq)
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{
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u32 simr;
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simr = ioasic_read(IO_REG_SIMR);
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simr &= ~(1 << (irq - ioasic_irq_base));
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ioasic_write(IO_REG_SIMR, simr);
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}
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static inline void clear_ioasic_irq(unsigned int irq)
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{
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u32 sir;
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sir = ~(1 << (irq - ioasic_irq_base));
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ioasic_write(IO_REG_SIR, sir);
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}
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static inline void ack_ioasic_irq(unsigned int irq)
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{
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mask_ioasic_irq(irq);
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fast_iob();
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}
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static inline void end_ioasic_irq(unsigned int irq)
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{
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if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
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unmask_ioasic_irq(irq);
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}
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static struct irq_chip ioasic_irq_type = {
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.name = "IO-ASIC",
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.ack = ack_ioasic_irq,
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.mask = mask_ioasic_irq,
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.mask_ack = ack_ioasic_irq,
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.unmask = unmask_ioasic_irq,
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};
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#define unmask_ioasic_dma_irq unmask_ioasic_irq
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#define mask_ioasic_dma_irq mask_ioasic_irq
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#define ack_ioasic_dma_irq ack_ioasic_irq
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static inline void end_ioasic_dma_irq(unsigned int irq)
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{
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clear_ioasic_irq(irq);
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fast_iob();
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end_ioasic_irq(irq);
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}
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static struct irq_chip ioasic_dma_irq_type = {
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.name = "IO-ASIC-DMA",
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.ack = ack_ioasic_dma_irq,
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.mask = mask_ioasic_dma_irq,
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.mask_ack = ack_ioasic_dma_irq,
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.unmask = unmask_ioasic_dma_irq,
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.end = end_ioasic_dma_irq,
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};
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void __init init_ioasic_irqs(int base)
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{
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int i;
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/* Mask interrupts. */
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ioasic_write(IO_REG_SIMR, 0);
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fast_iob();
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for (i = base; i < base + IO_INR_DMA; i++)
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set_irq_chip_and_handler(i, &ioasic_irq_type,
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handle_level_irq);
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for (; i < base + IO_IRQ_LINES; i++)
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set_irq_chip(i, &ioasic_dma_irq_type);
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ioasic_irq_base = base;
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}
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