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/*
* intc-simr.c
*
* Interrupt controller code for the ColdFire 5208, 5207 & 532x parts.
*
* (C) Copyright 2009-2011, Greg Ungerer <gerg@snapgear.com>
*
* 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/init.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <asm/coldfire.h>
#include <asm/mcfsim.h>
#include <asm/traps.h>
/*
* The EDGE Port interrupts are the fixed 7 external interrupts.
* They need some special treatment, for example they need to be acked.
*/
#ifdef CONFIG_M520x
/*
* The 520x parts only support a limited range of these external
* interrupts, only 1, 4 and 7 (as interrupts 65, 66 and 67).
*/
#define EINT0 64 /* Is not actually used, but spot reserved for it */
#define EINT1 65 /* EDGE Port interrupt 1 */
#define EINT4 66 /* EDGE Port interrupt 4 */
#define EINT7 67 /* EDGE Port interrupt 7 */
static unsigned int irqebitmap[] = { 0, 1, 4, 7 };
static unsigned int inline irq2ebit(unsigned int irq)
{
return irqebitmap[irq - EINT0];
}
#else
/*
* Most of the ColdFire parts with the EDGE Port module just have
* a strait direct mapping of the 7 external interrupts. Although
* there is a bit reserved for 0, it is not used.
*/
#define EINT0 64 /* Is not actually used, but spot reserved for it */
#define EINT1 65 /* EDGE Port interrupt 1 */
#define EINT7 71 /* EDGE Port interrupt 7 */
static unsigned int inline irq2ebit(unsigned int irq)
{
return irq - EINT0;
}
#endif
/*
* There maybe one or two interrupt control units, each has 64
* interrupts. If there is no second unit then MCFINTC1_* defines
* will be 0 (and code for them optimized away).
*/
static void intc_irq_mask(struct irq_data *d)
{
unsigned int irq = d->irq - MCFINT_VECBASE;
if (MCFINTC1_SIMR && (irq > 64))
__raw_writeb(irq - 64, MCFINTC1_SIMR);
else
__raw_writeb(irq, MCFINTC0_SIMR);
}
static void intc_irq_unmask(struct irq_data *d)
{
unsigned int irq = d->irq - MCFINT_VECBASE;
if (MCFINTC1_CIMR && (irq > 64))
__raw_writeb(irq - 64, MCFINTC1_CIMR);
else
__raw_writeb(irq, MCFINTC0_CIMR);
}
static void intc_irq_ack(struct irq_data *d)
{
unsigned int ebit = irq2ebit(d->irq);
__raw_writeb(0x1 << ebit, MCFEPORT_EPFR);
}
static unsigned int intc_irq_startup(struct irq_data *d)
{
unsigned int irq = d->irq;
if ((irq >= EINT1) && (irq <= EINT7)) {
unsigned int ebit = irq2ebit(irq);
u8 v;
/* Set EPORT line as input */
v = __raw_readb(MCFEPORT_EPDDR);
__raw_writeb(v & ~(0x1 << ebit), MCFEPORT_EPDDR);
/* Set EPORT line as interrupt source */
v = __raw_readb(MCFEPORT_EPIER);
__raw_writeb(v | (0x1 << ebit), MCFEPORT_EPIER);
}
irq -= MCFINT_VECBASE;
if (MCFINTC1_ICR0 && (irq > 64))
__raw_writeb(5, MCFINTC1_ICR0 + irq - 64);
else
__raw_writeb(5, MCFINTC0_ICR0 + irq);
intc_irq_unmask(d);
return 0;
}
static int intc_irq_set_type(struct irq_data *d, unsigned int type)
{
unsigned int ebit, irq = d->irq;
u16 pa, tb;
switch (type) {
case IRQ_TYPE_EDGE_RISING:
tb = 0x1;
break;
case IRQ_TYPE_EDGE_FALLING:
tb = 0x2;
break;
case IRQ_TYPE_EDGE_BOTH:
tb = 0x3;
break;
default:
/* Level triggered */
tb = 0;
break;
}
if (tb)
irq_set_handler(irq, handle_edge_irq);
ebit = irq2ebit(irq) * 2;
pa = __raw_readw(MCFEPORT_EPPAR);
pa = (pa & ~(0x3 << ebit)) | (tb << ebit);
__raw_writew(pa, MCFEPORT_EPPAR);
return 0;
}
static struct irq_chip intc_irq_chip = {
.name = "CF-INTC",
.irq_startup = intc_irq_startup,
.irq_mask = intc_irq_mask,
.irq_unmask = intc_irq_unmask,
};
static struct irq_chip intc_irq_chip_edge_port = {
.name = "CF-INTC-EP",
.irq_startup = intc_irq_startup,
.irq_mask = intc_irq_mask,
.irq_unmask = intc_irq_unmask,
.irq_ack = intc_irq_ack,
.irq_set_type = intc_irq_set_type,
};
void __init init_IRQ(void)
{
int irq, eirq;
/* Mask all interrupt sources */
__raw_writeb(0xff, MCFINTC0_SIMR);
if (MCFINTC1_SIMR)
__raw_writeb(0xff, MCFINTC1_SIMR);
eirq = MCFINT_VECBASE + 64 + (MCFINTC1_ICR0 ? 64 : 0);
for (irq = MCFINT_VECBASE; (irq < eirq); irq++) {
if ((irq >= EINT1) && (irq <= EINT7))
irq_set_chip(irq, &intc_irq_chip_edge_port);
else
irq_set_chip(irq, &intc_irq_chip);
irq_set_irq_type(irq, IRQ_TYPE_LEVEL_HIGH);
irq_set_handler(irq, handle_level_irq);
}
}
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