m68knommu: add support for Coldfire 547x/548x interrupt controller

The Coldfire MCF547x/MCF548x have the same interrupt controller as
the MCF528x e.g., but only one, not two as in the MCF528x.  Modify
intc-2.c to support only one interrupt controller if MCFICM_INTC1 is
not defined.

Signed-off-by: Philippe De Muyter <phdm@macqel.be>
Signed-off-by: Greg Ungerer <gerg@uclinux.org>

arch/m68knommu/platform/coldfire/intc-2.c

@@ -1,9 +1,11 @@
 /*
  * intc-2.c
  *
- * General interrupt controller code for the many ColdFire version 2 cores
- * that use the two region INTC interrupt controller. This includes the
- * 523x family, 5270, 5271, 5274, 5275, and the 528x families.
+ * 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>
  *
@@ -23,21 +25,37 @@
 #include <asm/traps.h>
 
 /*
- *	Each vector needs a unique priority and level asscoiated with it.
+ * 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 */
+
+/*
+ *	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
- *	tranditional priority interrupt scheme of the m68k/ColdFire.
+ *	traditional priority interrupt scheme of the m68k/ColdFire.
  */
-static u8 intc_intpri = 0x36;
+static u8 intc_intpri = MCFSIM_ICR_LEVEL(6) | MCFSIM_ICR_PRI(6);
+
+#ifdef MCFICM_INTC1
+#define NR_VECS	128
+#else
+#define NR_VECS	64
+#endif
 
 static void intc_irq_mask(unsigned int irq)
 {
-	if ((irq >= MCFINT_VECBASE) && (irq <= MCFINT_VECBASE + 128)) {
+	if ((irq >= MCFINT_VECBASE) && (irq <= MCFINT_VECBASE + NR_VECS)) {
 		unsigned long imraddr;
 		u32 val, imrbit;
 
 		irq -= MCFINT_VECBASE;
 		imraddr = MCF_IPSBAR;
+#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);
 
@@ -48,13 +66,17 @@ static void intc_irq_mask(unsigned int irq)
 
 static void intc_irq_unmask(unsigned int irq)
 {
-	if ((irq >= MCFINT_VECBASE) && (irq <= MCFINT_VECBASE + 128)) {
+	if ((irq >= MCFINT_VECBASE) && (irq <= MCFINT_VECBASE + NR_VECS)) {
 		unsigned long intaddr, imraddr, icraddr;
 		u32 val, imrbit;
 
 		irq -= MCFINT_VECBASE;
 		intaddr = MCF_IPSBAR;
+#ifdef MCFICM_INTC1
 		intaddr += (irq & 0x40) ? MCFICM_INTC1 : MCFICM_INTC0;
+#else
+		intaddr += MCFICM_INTC0;
+#endif
 		imraddr = intaddr + ((irq & 0x20) ? MCFINTC_IMRH : MCFINTC_IMRL);
 		icraddr = intaddr + MCFINTC_ICR0 + (irq & 0x3f);
 		imrbit = 0x1 << (irq & 0x1f);
@@ -85,7 +107,9 @@ void __init init_IRQ(void)
 
 	/* Mask all interrupt sources */
 	__raw_writel(0x1, MCF_IPSBAR + MCFICM_INTC0 + MCFINTC_IMRL);
+#ifdef MCFICM_INTC1
 	__raw_writel(0x1, MCF_IPSBAR + MCFICM_INTC1 + MCFINTC_IMRL);
+#endif
 
 	for (irq = 0; (irq < NR_IRQS); irq++) {
 		irq_desc[irq].status = IRQ_DISABLED;