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m68knommu: add support for second interrupt controller of ColdFire 5249 

The ColdFire 5249 CPU has a second (compleletly different) interrupt
controller. It is the only ColdFire CPU that has this type. It controlls
GPIO interrupts amongst a number of interrupts from other internal
peripherals. Add support code for it.

Signed-off-by: Greg Ungerer <gerg@uclinux.org>
This commit is contained in:
Greg Ungerer 2009-05-22 14:16:39 +10:00
parent 3945ca0f84
commit da3601a5fa
3 changed files with 78 additions and 3 deletions
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20
arch/m68k/include/asm/m5249sim.h
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@ -106,6 +106,22 @@
#define MCFSIM2_IDECONFIG1 0x18c /* IDEconfig1 */
#define MCFSIM2_IDECONFIG2 0x190 /* IDEconfig2 */
/*
* Define the base interrupt for the second interrupt controller.
* We set it to 128, out of the way of the base interrupts, and plenty
* of room for its 64 interrupts.
*/
#define MCFINTC2_VECBASE 128
#define MCFINTC2_GPIOIRQ0 (MCFINTC2_VECBASE + 32)
#define MCFINTC2_GPIOIRQ1 (MCFINTC2_VECBASE + 33)
#define MCFINTC2_GPIOIRQ2 (MCFINTC2_VECBASE + 34)
#define MCFINTC2_GPIOIRQ3 (MCFINTC2_VECBASE + 35)
#define MCFINTC2_GPIOIRQ4 (MCFINTC2_VECBASE + 36)
#define MCFINTC2_GPIOIRQ5 (MCFINTC2_VECBASE + 37)
#define MCFINTC2_GPIOIRQ6 (MCFINTC2_VECBASE + 38)
#define MCFINTC2_GPIOIRQ7 (MCFINTC2_VECBASE + 39)
/*
* Generic GPIO support
*/
@ -135,9 +151,9 @@
subql #1,%a1 /* get MBAR2 address in a1 */
/*
* Move secondary interrupts to base at 128.
* Move secondary interrupts to their base (128).
*/
moveb #0x80,%d0
moveb #MCFINTC2_VECBASE,%d0
moveb %d0,0x16b(%a1) /* interrupt base register */
/*

2
arch/m68knommu/platform/5249/Makefile
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@ -14,5 +14,5 @@
asflags-$(CONFIG_FULLDEBUG) := -DDEBUGGER_COMPATIBLE_CACHE=1
obj-y := config.o gpio.o
obj-y := config.o gpio.o intc2.o

59
arch/m68knommu/platform/5249/intc2.c Normal file
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@ -0,0 +1,59 @@
/*
* intc2.c -- support for the 2nd INTC controller of the 5249
*
* (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>
static void intc2_irq_gpio_mask(unsigned int irq)
{
u32 imr;
imr = readl(MCF_MBAR2 + MCFSIM2_GPIOINTENABLE);
imr &= ~(0x1 << (irq - MCFINTC2_GPIOIRQ0));
writel(imr, MCF_MBAR2 + MCFSIM2_GPIOINTENABLE);
}
static void intc2_irq_gpio_unmask(unsigned int irq)
{
u32 imr;
imr = readl(MCF_MBAR2 + MCFSIM2_GPIOINTENABLE);
imr |= (0x1 << (irq - MCFINTC2_GPIOIRQ0));
writel(imr, MCF_MBAR2 + MCFSIM2_GPIOINTENABLE);
}
static void intc2_irq_gpio_ack(unsigned int irq)
{
writel(0x1 << (irq - MCFINTC2_GPIOIRQ0), MCF_MBAR2 + MCFSIM2_GPIOINTCLEAR);
}
static struct irq_chip intc2_irq_gpio_chip = {
.name = "CF-INTC2",
.mask = intc2_irq_gpio_mask,
.unmask = intc2_irq_gpio_unmask,
.ack = intc2_irq_gpio_ack,
};
static int __init mcf_intc2_init(void)
{
int irq;
/* GPIO interrupt sources */
for (irq = MCFINTC2_GPIOIRQ0; (irq <= MCFINTC2_GPIOIRQ7); irq++)
irq_desc[irq].chip = &intc2_irq_gpio_chip;
return 0;
}
arch_initcall(mcf_intc2_init);