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/*
* intc-2.c
*
* General interrupt controller code for the many ColdFire cores that use
* interrupt controllers with 63 interrupt sources, organized as 56 fully-
* programmable + 7 fixed-level interrupt sources. This includes the 523x
* family, the 5270, 5271, 5274, 5275, and the 528x family which have two such
* controllers, and the 547x and 548x families which have only one of them.
*
* (C) Copyright 2009, 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>
/*
* Bit definitions for the ICR family of registers.
*/
#define MCFSIM_ICR_LEVEL(l) ((l)<<3) /* Level l intr */
#define MCFSIM_ICR_PRI(p) (p) /* Priority p intr */
#ifdef MCFICM_INTC1
#define NR_VECS 128
#else
#define NR_VECS 64
#endif
static void intc_irq_mask(struct irq_data *d)
{
unsigned int irq = d->irq - MCFINT_VECBASE;
unsigned long imraddr;
u32 val, imrbit;
#ifdef MCFICM_INTC1
imraddr = (irq & 0x40) ? MCFICM_INTC1 : MCFICM_INTC0;
#else
imraddr = MCFICM_INTC0;
#endif
imraddr += (irq & 0x20) ? MCFINTC_IMRH : MCFINTC_IMRL;
imrbit = 0x1 << (irq & 0x1f);
val = __raw_readl(imraddr);
__raw_writel(val | imrbit, imraddr);
}
static void intc_irq_unmask(struct irq_data *d)
{
unsigned int irq = d->irq - MCFINT_VECBASE;
unsigned long imraddr;
u32 val, imrbit;
#ifdef MCFICM_INTC1
imraddr = (irq & 0x40) ? MCFICM_INTC1 : MCFICM_INTC0;
#else
imraddr = MCFICM_INTC0;
#endif
imraddr += ((irq & 0x20) ? MCFINTC_IMRH : MCFINTC_IMRL);
imrbit = 0x1 << (irq & 0x1f);
/* Don't set the "maskall" bit! */
if ((irq & 0x20) == 0)
imrbit |= 0x1;
val = __raw_readl(imraddr);
__raw_writel(val & ~imrbit, imraddr);
}
static int intc_irq_set_type(struct irq_data *d, unsigned int type)
{
return 0;
}
/*
* Each vector needs a unique priority and level associated with it.
* We don't really care so much what they are, we don't rely on the
* traditional priority interrupt scheme of the m68k/ColdFire. This
* only needs to be set once for an interrupt, and we will never change
* these values once we have set them.
*/
static u8 intc_intpri = MCFSIM_ICR_LEVEL(6) | MCFSIM_ICR_PRI(6);
static unsigned int intc_irq_startup(struct irq_data *d)
{
unsigned int irq = d->irq - MCFINT_VECBASE;
unsigned long icraddr;
#ifdef MCFICM_INTC1
icraddr = (irq & 0x40) ? MCFICM_INTC1 : MCFICM_INTC0;
#else
icraddr = MCFICM_INTC0;
#endif
icraddr += MCFINTC_ICR0 + (irq & 0x3f);
if (__raw_readb(icraddr) == 0)
__raw_writeb(intc_intpri--, icraddr);
intc_irq_unmask(d);
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,
.irq_set_type = intc_irq_set_type,
};
void __init init_IRQ(void)
{
int irq;
init_vectors();
/* Mask all interrupt sources */
__raw_writel(0x1, MCFICM_INTC0 + MCFINTC_IMRL);
#ifdef MCFICM_INTC1
__raw_writel(0x1, MCFICM_INTC1 + MCFINTC_IMRL);
#endif
for (irq = MCFINT_VECBASE; (irq < MCFINT_VECBASE + NR_VECS); irq++) {
set_irq_chip(irq, &intc_irq_chip);
set_irq_type(irq, IRQ_TYPE_LEVEL_HIGH);
set_irq_handler(irq, handle_level_irq);
}
}
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