119 lines
2.2 KiB
C
119 lines
2.2 KiB
C
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/*
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* arch/sh/boards/saturn/irq.c
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*
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* Copyright (C) 2002 Paul Mundt
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*
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* Released under the terms of the GNU GPL v2.0.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <asm/irq.h>
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#include <asm/io.h>
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/*
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* Interrupts map out as follows:
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*
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* Vector Name Mask
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*
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* 64 VBLANKIN 0x0001
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* 65 VBLANKOUT 0x0002
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* 66 HBLANKIN 0x0004
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* 67 TIMER0 0x0008
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* 68 TIMER1 0x0010
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* 69 DSPEND 0x0020
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* 70 SOUNDREQUEST 0x0040
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* 71 SYSTEMMANAGER 0x0080
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* 72 PAD 0x0100
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* 73 LEVEL2DMAEND 0x0200
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* 74 LEVEL1DMAEND 0x0400
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* 75 LEVEL0DMAEND 0x0800
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* 76 DMAILLEGAL 0x1000
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* 77 SRITEDRAWEND 0x2000
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* 78 ABUS 0x8000
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*
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*/
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#define SATURN_IRQ_MIN 64 /* VBLANKIN */
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#define SATURN_IRQ_MAX 78 /* ABUS */
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#define SATURN_IRQ_MASK 0xbfff
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static inline u32 saturn_irq_mask(unsigned int irq_nr)
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{
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u32 mask;
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mask = (1 << (irq_nr - SATURN_IRQ_MIN));
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mask <<= (irq_nr == SATURN_IRQ_MAX);
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mask &= SATURN_IRQ_MASK;
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return mask;
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}
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static inline void mask_saturn_irq(unsigned int irq_nr)
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{
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u32 mask;
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mask = ctrl_inl(SATURN_IMR);
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mask |= saturn_irq_mask(irq_nr);
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ctrl_outl(mask, SATURN_IMR);
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}
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static inline void unmask_saturn_irq(unsigned int irq_nr)
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{
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u32 mask;
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mask = ctrl_inl(SATURN_IMR);
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mask &= ~saturn_irq_mask(irq_nr);
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ctrl_outl(mask, SATURN_IMR);
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}
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static void disable_saturn_irq(unsigned int irq_nr)
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{
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mask_saturn_irq(irq_nr);
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}
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static void enable_saturn_irq(unsigned int irq_nr)
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{
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unmask_saturn_irq(irq_nr);
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}
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static void mask_and_ack_saturn_irq(unsigned int irq_nr)
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{
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mask_saturn_irq(irq_nr);
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}
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static void end_saturn_irq(unsigned int irq_nr)
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{
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if (!(irq_desc[irq_nr].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
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unmask_saturn_irq(irq_nr);
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}
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static unsigned int startup_saturn_irq(unsigned int irq_nr)
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{
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unmask_saturn_irq(irq_nr);
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return 0;
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}
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static void shutdown_saturn_irq(unsigned int irq_nr)
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{
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mask_saturn_irq(irq_nr);
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}
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static struct hw_interrupt_type saturn_int = {
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.typename = "Saturn",
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.enable = enable_saturn_irq,
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.disable = disable_saturn_irq,
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.ack = mask_and_ack_saturn_irq,
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.end = end_saturn_irq,
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.startup = startup_saturn_irq,
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.shutdown = shutdown_saturn_irq,
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};
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int saturn_irq_demux(int irq_nr)
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{
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/* FIXME */
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return irq_nr;
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}
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