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/*
* $Id: setup_hd64461.c,v 1.1 2000/06/10 21:45:18 yaegashi Exp $
* Copyright (C) 2000 YAEGASHI Takeshi
* Hitachi HD64461 companion chip support
*/
#include <linux/config.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/param.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/hd64461.h>
static void disable_hd64461_irq(unsigned int irq)
{
unsigned long flags;
unsigned short nimr;
unsigned short mask = 1 << (irq - HD64461_IRQBASE);
save_and_cli(flags);
nimr = inw(HD64461_NIMR);
nimr |= mask;
outw(nimr, HD64461_NIMR);
restore_flags(flags);
}
static void enable_hd64461_irq(unsigned int irq)
{
unsigned long flags;
unsigned short nimr;
unsigned short mask = 1 << (irq - HD64461_IRQBASE);
save_and_cli(flags);
nimr = inw(HD64461_NIMR);
nimr &= ~mask;
outw(nimr, HD64461_NIMR);
restore_flags(flags);
}
static void mask_and_ack_hd64461(unsigned int irq)
{
disable_hd64461_irq(irq);
#ifdef CONFIG_HD64461_ENABLER
if (irq == HD64461_IRQBASE + 13)
outb(0x00, HD64461_PCC1CSCR);
#endif
}
static void end_hd64461_irq(unsigned int irq)
{
enable_hd64461_irq(irq);
}
static unsigned int startup_hd64461_irq(unsigned int irq)
{
enable_hd64461_irq(irq);
return 0;
}
static void shutdown_hd64461_irq(unsigned int irq)
{
disable_hd64461_irq(irq);
}
static struct hw_interrupt_type hd64461_irq_type = {
"HD64461-IRQ",
startup_hd64461_irq,
shutdown_hd64461_irq,
enable_hd64461_irq,
disable_hd64461_irq,
mask_and_ack_hd64461,
end_hd64461_irq
};
static void hd64461_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
printk(KERN_INFO
"HD64461: spurious interrupt, nirr: 0x%lx nimr: 0x%lx\n",
inw(HD64461_NIRR), inw(HD64461_NIMR));
}
int hd64461_irq_demux(int irq)
{
if (irq == CONFIG_HD64461_IRQ) {
unsigned short bit;
unsigned short nirr = inw(HD64461_NIRR);
unsigned short nimr = inw(HD64461_NIMR);
nirr &= ~nimr;
for (bit = 1, irq = 0; irq < 16; bit <<= 1, irq++)
if (nirr & bit) break;
if (irq == 16) irq = CONFIG_HD64461_IRQ;
else irq += HD64461_IRQBASE;
}
return irq;
}
static struct irqaction irq0 = { hd64461_interrupt, SA_INTERRUPT, 0, "HD64461", NULL, NULL};
int __init setup_hd64461(void)
{
int i;
if (!MACH_HD64461)
return 0;
printk(KERN_INFO "HD64461 configured at 0x%x on irq %d(mapped into %d to %d)\n",
CONFIG_HD64461_IOBASE, CONFIG_HD64461_IRQ,
HD64461_IRQBASE, HD64461_IRQBASE+15);
#ifdef CONFIG_CPU_SUBTYPE_SH7709
/* IRQ line for HD64461 should be set level trigger mode("10"). */
/* And this should be done earlier than the kernel starts. */
ctrl_outw(0x0200, INTC_ICR1); /* when connected to IRQ4. */
#endif
outw(0xffff, HD64461_NIMR);
for (i = HD64461_IRQBASE; i < HD64461_IRQBASE + 16; i++) {
irq_desc[i].handler = &hd64461_irq_type;
}
setup_irq(CONFIG_HD64461_IRQ, &irq0);
#ifdef CONFIG_HD64461_ENABLER
printk(KERN_INFO "HD64461: enabling PCMCIA devices\n");
outb(0x04, HD64461_PCC1CSCIER);
outb(0x00, HD64461_PCC1CSCR);
#endif
return 0;
}
module_init(setup_hd64461);
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