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