m68knommu: external interrupt support to ColdFire intc-simr controller
The EDGE Port module of some ColdFire parts using the intc-simr interrupt
controller provides support for 7 external interrupts. These interrupts
go off-chip (that is they are not for internal peripherals). They need
some special handling and have some extra setup registers. Add code to
support them.
Signed-off-by: Greg Ungerer <gerg@uclinux.org>
diff --git a/arch/m68knommu/platform/coldfire/intc-simr.c b/arch/m68knommu/platform/coldfire/intc-simr.c
index 8876f43..e642b24a 100644
--- a/arch/m68knommu/platform/coldfire/intc-simr.c
+++ b/arch/m68knommu/platform/coldfire/intc-simr.c
@@ -3,7 +3,7 @@
*
* Interrupt controller code for the ColdFire 5208, 5207 & 532x parts.
*
- * (C) Copyright 2009, Greg Ungerer <gerg@snapgear.com>
+ * (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
@@ -21,6 +21,44 @@
#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).
@@ -46,21 +84,86 @@
__raw_writeb(irq, MCFINTC0_CIMR);
}
-static int intc_irq_set_type(struct irq_data *d, unsigned int type)
+static void intc_irq_ack(struct irq_data *d)
{
- unsigned int irq = d->irq - MCFINT_VECBASE;
+ 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)
+ set_irq_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,
};
@@ -77,7 +180,10 @@
eirq = MCFINT_VECBASE + 64 + (MCFINTC1_ICR0 ? 64 : 0);
for (irq = MCFINT_VECBASE; (irq < eirq); irq++) {
- set_irq_chip(irq, &intc_irq_chip);
+ if ((irq >= EINT1) && (irq <= EINT7))
+ set_irq_chip(irq, &intc_irq_chip_edge_port);
+ else
+ set_irq_chip(irq, &intc_irq_chip);
set_irq_type(irq, IRQ_TYPE_LEVEL_HIGH);
set_irq_handler(irq, handle_level_irq);
}