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/*
* linux/arch/m68k/amiga/cia.c - CIA support
*
* Copyright (C) 1996 Roman Zippel
*
* The concept of some functions bases on the original Amiga OS function
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive
* for more details.
*/
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/kernel_stat.h>
#include <linux/init.h>
#include <linux/seq_file.h>
#include <linux/interrupt.h>
#include <asm/irq.h>
#include <asm/amigahw.h>
#include <asm/amigaints.h>
struct ciabase {
volatile struct CIA *cia;
unsigned char icr_mask, icr_data;
unsigned short int_mask;
int handler_irq, cia_irq, server_irq;
char *name;
} ciaa_base = {
.cia = &ciaa,
.int_mask = IF_PORTS,
.handler_irq = IRQ_AMIGA_PORTS,
.cia_irq = IRQ_AMIGA_CIAA,
.name = "CIAA"
}, ciab_base = {
.cia = &ciab,
.int_mask = IF_EXTER,
.handler_irq = IRQ_AMIGA_EXTER,
.cia_irq = IRQ_AMIGA_CIAB,
.name = "CIAB"
};
/*
* Cause or clear CIA interrupts, return old interrupt status.
*/
unsigned char cia_set_irq(struct ciabase *base, unsigned char mask)
{
unsigned char old;
old = (base->icr_data |= base->cia->icr);
if (mask & CIA_ICR_SETCLR)
base->icr_data |= mask;
else
base->icr_data &= ~mask;
if (base->icr_data & base->icr_mask)
amiga_custom.intreq = IF_SETCLR | base->int_mask;
return old & base->icr_mask;
}
/*
* Enable or disable CIA interrupts, return old interrupt mask,
*/
unsigned char cia_able_irq(struct ciabase *base, unsigned char mask)
{
unsigned char old;
old = base->icr_mask;
base->icr_data |= base->cia->icr;
base->cia->icr = mask;
if (mask & CIA_ICR_SETCLR)
base->icr_mask |= mask;
else
base->icr_mask &= ~mask;
base->icr_mask &= CIA_ICR_ALL;
if (base->icr_data & base->icr_mask)
amiga_custom.intreq = IF_SETCLR | base->int_mask;
return old;
}
static irqreturn_t cia_handler(int irq, void *dev_id, struct pt_regs *fp)
{
struct ciabase *base = (struct ciabase *)dev_id;
int mach_irq;
unsigned char ints;
mach_irq = base->cia_irq;
ints = cia_set_irq(base, CIA_ICR_ALL);
amiga_custom.intreq = base->int_mask;
for (; ints; mach_irq++, ints >>= 1) {
if (ints & 1)
m68k_handle_int(mach_irq, fp);
}
return IRQ_HANDLED;
}
static void cia_enable_irq(unsigned int irq)
{
unsigned char mask;
if (irq >= IRQ_AMIGA_CIAB) {
mask = 1 << (irq - IRQ_AMIGA_CIAB);
cia_set_irq(&ciab_base, mask);
cia_able_irq(&ciab_base, CIA_ICR_SETCLR | mask);
} else {
mask = 1 << (irq - IRQ_AMIGA_CIAA);
cia_set_irq(&ciaa_base, mask);
cia_able_irq(&ciaa_base, CIA_ICR_SETCLR | mask);
}
}
static void cia_disable_irq(unsigned int irq)
{
if (irq >= IRQ_AMIGA_CIAB)
cia_able_irq(&ciab_base, 1 << (irq - IRQ_AMIGA_CIAB));
else
cia_able_irq(&ciaa_base, 1 << (irq - IRQ_AMIGA_CIAA));
}
static struct irq_controller cia_irq_controller = {
.name = "cia",
.lock = SPIN_LOCK_UNLOCKED,
.enable = cia_enable_irq,
.disable = cia_disable_irq,
};
/*
* Override auto irq 2 & 6 and use them as general chain
* for external interrupts, we link the CIA interrupt sources
* into this chain.
*/
static void auto_enable_irq(unsigned int irq)
{
switch (irq) {
case IRQ_AUTO_2:
amiga_custom.intena = IF_SETCLR | IF_PORTS;
break;
case IRQ_AUTO_6:
amiga_custom.intena = IF_SETCLR | IF_EXTER;
break;
}
}
static void auto_disable_irq(unsigned int irq)
{
switch (irq) {
case IRQ_AUTO_2:
amiga_custom.intena = IF_PORTS;
break;
case IRQ_AUTO_6:
amiga_custom.intena = IF_EXTER;
break;
}
}
static struct irq_controller auto_irq_controller = {
.name = "auto",
.lock = SPIN_LOCK_UNLOCKED,
.enable = auto_enable_irq,
.disable = auto_disable_irq,
};
void __init cia_init_IRQ(struct ciabase *base)
{
m68k_setup_irq_controller(&cia_irq_controller, base->cia_irq, CIA_IRQS);
/* clear any pending interrupt and turn off all interrupts */
cia_set_irq(base, CIA_ICR_ALL);
cia_able_irq(base, CIA_ICR_ALL);
/* override auto int and install CIA handler */
m68k_setup_irq_controller(&auto_irq_controller, base->handler_irq, 1);
m68k_irq_startup(base->handler_irq);
request_irq(base->handler_irq, cia_handler, SA_SHIRQ, base->name, base);
}
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