m68knommu: map ColdFire interrupts to correct masking bits

The older simple ColdFire interrupt controller has no one-to-one mapping
of interrupt numbers to bits in the interrupt mask register. Create a
mapping array that each ColdFire CPU type can populate with its available
interrupts and the bits that each use in the interrupt mask register.

Signed-off-by: Greg Ungerer <gerg@uclinux.org>

1 files changed, 16 insertions, 6 deletions

diff --git a/arch/m68k/include/asm/mcfintc.h b/arch/m68k/include/asm/mcfintc.h
index 213aa6c68abb..4183320a3813 100644
--- a/arch/m68k/include/asm/mcfintc.h
+++ b/arch/m68k/include/asm/mcfintc.h
@@ -25,11 +25,6 @@
  */
 
 /*
- * Define the base address of the SIM within the MBAR address space.
- */
-#define MCFSIM_BASE             0x0             /* Base address within SIM */
-
-/*
  * Bit definitions for the ICR family of registers.
  */
 #define MCFSIM_ICR_AUTOVEC      0x80            /* Auto-vectored intr */
@@ -48,7 +43,9 @@
 #define MCFSIM_ICR_PRI3         0x03            /* Priority 3 intr */
 
 /*
- * IMR bit position definitions.
+ * IMR bit position definitions. Not all ColdFire parts with this interrupt
+ * controller actually support all of these interrupt sources. But the bit
+ * numbers are the same in all cores.
  */
 #define MCFINTC_EINT1           1               /* External int #1 */
 #define MCFINTC_EINT2           2               /* External int #2 */
@@ -70,6 +67,19 @@
 #define MCFINTC_QSPI            18
 
 #ifndef __ASSEMBLER__
+
+/*
+ * There is no one-is-one correspondance between the interrupt number (irq)
+ * and the bit fields on the mask register. So we create a per-cpu type
+ * mapping of irq to mask bit. The CPU platform code needs to register
+ * its supported irq's at init time, using this function.
+ */
+extern unsigned char mcf_irq2imr[];
+static inline void mcf_mapirq2imr(int irq, int imr)
+{
+        mcf_irq2imr[irq] = imr;
+}
+
 void mcf_autovector(int irq);
 void mcf_setimr(int index);
 void mcf_clrimr(int index);