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authorGreg Ungerer <gerg@uclinux.org>2009-05-22 14:16:39 +1000
committerGreg Ungerer <gerg@uclinux.org>2009-09-16 09:43:53 +1000
commitda3601a5fa664c8d51383fe916d96bd4fbce84b8 (patch)
tree83ee5d4e283cfdd11e83bdb7c739b5ccbeb9264a /arch/m68knommu
parent3945ca0f84fee3fe564189fe8cf8f02491d19622 (diff)
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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>
Diffstat (limited to 'arch/m68knommu')
-rw-r--r--arch/m68knommu/platform/5249/Makefile2
-rw-r--r--arch/m68knommu/platform/5249/intc2.c59
2 files changed, 60 insertions, 1 deletions
diff --git a/arch/m68knommu/platform/5249/Makefile b/arch/m68knommu/platform/5249/Makefile
index 113c333..f56225d 100644
--- a/arch/m68knommu/platform/5249/Makefile
+++ b/arch/m68knommu/platform/5249/Makefile
@@ -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
diff --git a/arch/m68knommu/platform/5249/intc2.c b/arch/m68knommu/platform/5249/intc2.c
new file mode 100644
index 0000000..d09d9da
--- /dev/null
+++ b/arch/m68knommu/platform/5249/intc2.c
@@ -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);