[MIPS] Define MIPS_CPU_IRQ_BASE in generic header

The irq_base for {mips,rm7k,rm9k}_cpu_irq_init() are constant on all
platforms and are same value on most platforms (0 or 16, depends on
CONFIG_I8259).  Define them in asm-mips/mach-generic/irq.h and make
them customizable.  This will save a few cycle on each CPU interrupt.

A good side effect is removing some dependencies to MALTA in generic
SMTC code.

Although MIPS_CPU_IRQ_BASE is customizable, this patch changes irq
mappings on DDB5477, EMMA2RH and MIPS_SIM, since really customizing
them might cause some header dependency problem and there seems no
good reason to customize it.  So currently only VR41XX is using custom
MIPS_CPU_IRQ_BASE value, which is 0 regardless of CONFIG_I8259.

Testing this patch on those platforms is greatly appreciated.  Thank
you.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

4 files changed, 5 insertions, 7 deletions

diff --git a/arch/mips/mips-boards/atlas/atlas_int.c b/arch/mips/mips-boards/atlas/atlas_int.c
index 43dba6ce6603..85482a631e8c 100644
--- a/arch/mips/mips-boards/atlas/atlas_int.c
+++ b/arch/mips/mips-boards/atlas/atlas_int.c
@@ -238,7 +238,7 @@ void __init arch_init_irq(void)
         init_atlas_irqs(ATLAS_INT_BASE);
 
         if (!cpu_has_veic)
-                mips_cpu_irq_init(MIPSCPU_INT_BASE);
+                mips_cpu_irq_init();
 
         switch(mips_revision_corid) {
         case MIPS_REVISION_CORID_CORE_MSC:
diff --git a/arch/mips/mips-boards/malta/malta_int.c b/arch/mips/mips-boards/malta/malta_int.c
index 90ad5bf3e2f1..d9ddb170e595 100644
--- a/arch/mips/mips-boards/malta/malta_int.c
+++ b/arch/mips/mips-boards/malta/malta_int.c
@@ -310,7 +310,7 @@ void __init arch_init_irq(void)
         init_i8259_irqs();
 
         if (!cpu_has_veic)
-                mips_cpu_irq_init (MIPSCPU_INT_BASE);
+                mips_cpu_irq_init();
 
         switch(mips_revision_corid) {
         case MIPS_REVISION_CORID_CORE_MSC:
diff --git a/arch/mips/mips-boards/sead/sead_int.c b/arch/mips/mips-boards/sead/sead_int.c
index 874ccb0066b8..c4b9de3a7f27 100644
--- a/arch/mips/mips-boards/sead/sead_int.c
+++ b/arch/mips/mips-boards/sead/sead_int.c
@@ -113,5 +113,5 @@ asmlinkage void plat_irq_dispatch(void)
 
 void __init arch_init_irq(void)
 {
-        mips_cpu_irq_init(MIPSCPU_INT_BASE);
+        mips_cpu_irq_init();
 }
diff --git a/arch/mips/mips-boards/sim/sim_int.c b/arch/mips/mips-boards/sim/sim_int.c
index 2ce449dce6f2..15ac0655c1ff 100644
--- a/arch/mips/mips-boards/sim/sim_int.c
+++ b/arch/mips/mips-boards/sim/sim_int.c
@@ -21,9 +21,7 @@
 #include <linux/interrupt.h>
 #include <linux/kernel_stat.h>
 #include <asm/mips-boards/simint.h>
-
-
-extern void mips_cpu_irq_init(int);
+#include <asm/irq_cpu.h>
 
 static inline int clz(unsigned long x)
 {
@@ -86,5 +84,5 @@ asmlinkage void plat_irq_dispatch(void)
 
 void __init arch_init_irq(void)
 {
-        mips_cpu_irq_init(MIPSCPU_INT_BASE);
+        mips_cpu_irq_init();
 }