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/*
* intc-1.c
*
* (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>
/*
* Each vector needs a unique priority and level asscoiated with it.
* We don't really care so much what they are, we don't rely on the
* tranditional priority interrupt scheme of the m68k/ColdFire.
*/
static u8 intc_intpri = 0x36;
static void intc_irq_mask(unsigned int irq)
{
if ((irq >= MCFINT_VECBASE) && (irq <= MCFINT_VECBASE + 128)) {
unsigned long imraddr;
u32 val, imrbit;
irq -= MCFINT_VECBASE;
imraddr = MCF_IPSBAR;
imraddr += (irq & 0x40) ? MCFICM_INTC1 : MCFICM_INTC0;
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(unsigned int irq)
{
if ((irq >= MCFINT_VECBASE) && (irq <= MCFINT_VECBASE + 128)) {
unsigned long intaddr, imraddr, icraddr;
u32 val, imrbit;
irq -= MCFINT_VECBASE;
intaddr = MCF_IPSBAR;
intaddr += (irq & 0x40) ? MCFICM_INTC1 : MCFICM_INTC0;
imraddr = intaddr + ((irq & 0x20) ? MCFINTC_IMRH : MCFINTC_IMRL);
icraddr = intaddr + MCFINTC_ICR0 + (irq & 0x3f);
imrbit = 0x1 << (irq & 0x1f);
/* Don't set the "maskall" bit! */
if ((irq & 0x20) == 0)
imrbit |= 0x1;
if (__raw_readb(icraddr) == 0)
__raw_writeb(intc_intpri--, icraddr);
val = __raw_readl(imraddr);
__raw_writel(val & ~imrbit, imraddr);
}
}
static struct irq_chip intc_irq_chip = {
.name = "CF-INTC",
.mask = intc_irq_mask,
.unmask = intc_irq_unmask,
};
void __init init_IRQ(void)
{
int irq;
init_vectors();
/* Mask all interrupt sources */
__raw_writel(0x1, MCF_IPSBAR + MCFICM_INTC0 + MCFINTC_IMRL);
__raw_writel(0x1, MCF_IPSBAR + MCFICM_INTC1 + MCFINTC_IMRL);
for (irq = 0; (irq < NR_IRQS); irq++) {
irq_desc[irq].status = IRQ_DISABLED;
irq_desc[irq].action = NULL;
irq_desc[irq].depth = 1;
irq_desc[irq].chip = &intc_irq_chip;
}
}
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