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/*
* Copyright (C) 2000 YAEGASHI Takeshi
* Hitachi HD64461 companion chip support
*/
#include <linux/sched.h>
#include <linux/module.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>
/* This belongs in cpu specific */
#define INTC_ICR1 0xA4140010UL
static void disable_hd64461_irq(unsigned int irq)
{
unsigned short nimr;
unsigned short mask = 1 << (irq - HD64461_IRQBASE);
nimr = inw(HD64461_NIMR);
nimr |= mask;
outw(nimr, HD64461_NIMR);
}
static void enable_hd64461_irq(unsigned int irq)
{
unsigned short nimr;
unsigned short mask = 1 << (irq - HD64461_IRQBASE);
nimr = inw(HD64461_NIMR);
nimr &= ~mask;
outw(nimr, HD64461_NIMR);
}
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)
{
if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
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 = {
.typename = "HD64461-IRQ",
.startup = startup_hd64461_irq,
.shutdown = shutdown_hd64461_irq,
.enable = enable_hd64461_irq,
.disable = disable_hd64461_irq,
.ack = mask_and_ack_hd64461,
.end = end_hd64461_irq,
};
static irqreturn_t hd64461_interrupt(int irq, void *dev_id)
{
printk(KERN_INFO
"HD64461: spurious interrupt, nirr: 0x%x nimr: 0x%x\n",
inw(HD64461_NIRR), inw(HD64461_NIMR));
return IRQ_NONE;
}
static struct {
int (*func) (int, void *);
void *dev;
} hd64461_demux[HD64461_IRQ_NUM];
void hd64461_register_irq_demux(int irq,
int (*demux) (int irq, void *dev), void *dev)
{
hd64461_demux[irq - HD64461_IRQBASE].func = demux;
hd64461_demux[irq - HD64461_IRQBASE].dev = dev;
}
EXPORT_SYMBOL(hd64461_register_irq_demux);
void hd64461_unregister_irq_demux(int irq)
{
hd64461_demux[irq - HD64461_IRQBASE].func = 0;
}
EXPORT_SYMBOL(hd64461_unregister_irq_demux);
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);
int i;
nirr &= ~nimr;
for (bit = 1, i = 0; i < 16; bit <<= 1, i++)
if (nirr & bit)
break;
if (i == 16)
irq = CONFIG_HD64461_IRQ;
else {
irq = HD64461_IRQBASE + i;
if (hd64461_demux[i].func != 0) {
irq = hd64461_demux[i].func(irq, hd64461_demux[i].dev);
}
}
}
return irq;
}
static struct irqaction irq0 = {
.handler = hd64461_interrupt,
.flags = IRQF_DISABLED,
.mask = CPU_MASK_NONE,
.name = "HD64461",
};
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);
#if defined(CONFIG_CPU_SUBTYPE_SH7709) /* Should be at processor specific part.. */
outw(0x2240, INTC_ICR1);
#endif
outw(0xffff, HD64461_NIMR);
/* IRQ 80 -> 95 belongs to HD64461 */
for (i = HD64461_IRQBASE; i < HD64461_IRQBASE + 16; i++) {
irq_desc[i].chip = &hd64461_irq_type;
}
setup_irq(CONFIG_HD64461_IRQ, &irq0);
#ifdef CONFIG_HD64461_ENABLER
printk(KERN_INFO "HD64461: enabling PCMCIA devices\n");
outb(0x4c, HD64461_PCC1CSCIER);
outb(0x00, HD64461_PCC1CSCR);
#endif
return 0;
}
module_init(setup_hd64461);
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