[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>

16 files changed, 73 insertions, 20 deletions

diff --git a/include/asm-mips/ddb5xxx/ddb5477.h b/include/asm-mips/ddb5xxx/ddb5477.h
index c5af4b73fd..27655dbd23 100644
--- a/include/asm-mips/ddb5xxx/ddb5477.h
+++ b/include/asm-mips/ddb5xxx/ddb5477.h
@@ -17,6 +17,7 @@
 #ifndef __ASM_DDB5XXX_DDB5477_H
 #define __ASM_DDB5XXX_DDB5477_H
 
+#include <irq.h>
 
 /*
  * This contains macros that are specific to DDB5477 or renamed from
@@ -257,8 +258,8 @@ extern void ll_vrc5477_irq_disable(int vrc5477_irq);
 #define DDB_IRQ_BASE            0
 
 #define I8259_IRQ_BASE          DDB_IRQ_BASE
-#define VRC5477_IRQ_BASE        (I8259_IRQ_BASE + NUM_I8259_IRQ)
-#define CPU_IRQ_BASE            (VRC5477_IRQ_BASE + NUM_VRC5477_IRQ)
+#define CPU_IRQ_BASE            MIPS_CPU_IRQ_BASE
+#define VRC5477_IRQ_BASE        (CPU_IRQ_BASE + NUM_CPU_IRQ)
 
 /*
  * vrc5477 irq defs
diff --git a/include/asm-mips/dec/interrupts.h b/include/asm-mips/dec/interrupts.h
index 273e4d65bf..e10d341067 100644
--- a/include/asm-mips/dec/interrupts.h
+++ b/include/asm-mips/dec/interrupts.h
@@ -14,6 +14,7 @@
 #ifndef __ASM_DEC_INTERRUPTS_H
 #define __ASM_DEC_INTERRUPTS_H
 
+#include <irq.h>
 #include <asm/mipsregs.h>
 
 
@@ -87,7 +88,7 @@
 #define DEC_CPU_INR_SW1         1       /* software #1 */
 #define DEC_CPU_INR_SW0         0       /* software #0 */
 
-#define DEC_CPU_IRQ_BASE        0       /* first IRQ assigned to CPU */
+#define DEC_CPU_IRQ_BASE        MIPS_CPU_IRQ_BASE       /* first IRQ assigned to CPU */
 
 #define DEC_CPU_IRQ_NR(n)       ((n) + DEC_CPU_IRQ_BASE)
 #define DEC_CPU_IRQ_MASK(n)     (1 << ((n) + CAUSEB_IP))
diff --git a/include/asm-mips/emma2rh/emma2rh.h b/include/asm-mips/emma2rh/emma2rh.h
index 4fb8df71ca..6a1af0af51 100644
--- a/include/asm-mips/emma2rh/emma2rh.h
+++ b/include/asm-mips/emma2rh/emma2rh.h
@@ -24,6 +24,8 @@
 #ifndef __ASM_EMMA2RH_EMMA2RH_H
 #define __ASM_EMMA2RH_EMMA2RH_H
 
+#include <irq.h>
+
 /*
  * EMMA2RH registers
  */
@@ -104,7 +106,8 @@
 #define NUM_EMMA2RH_IRQ         96
 
 #define CPU_EMMA2RH_CASCADE     2
-#define EMMA2RH_IRQ_BASE        0
+#define CPU_IRQ_BASE            MIPS_CPU_IRQ_BASE
+#define EMMA2RH_IRQ_BASE        (CPU_IRQ_BASE + NUM_CPU_IRQ)
 
 /*
  * emma2rh irq defs
diff --git a/include/asm-mips/emma2rh/markeins.h b/include/asm-mips/emma2rh/markeins.h
index 8fa7667950..973b062849 100644
--- a/include/asm-mips/emma2rh/markeins.h
+++ b/include/asm-mips/emma2rh/markeins.h
@@ -33,7 +33,6 @@
 
 #define EMMA2RH_SW_IRQ_BASE     (EMMA2RH_IRQ_BASE + NUM_EMMA2RH_IRQ)
 #define EMMA2RH_GPIO_IRQ_BASE   (EMMA2RH_SW_IRQ_BASE + NUM_EMMA2RH_IRQ_SW)
-#define CPU_IRQ_BASE            (EMMA2RH_GPIO_IRQ_BASE + NUM_EMMA2RH_IRQ_GPIO)
 
 #define EMMA2RH_SW_IRQ_INT0     (0+EMMA2RH_SW_IRQ_BASE)
 #define EMMA2RH_SW_IRQ_INT1     (1+EMMA2RH_SW_IRQ_BASE)
diff --git a/include/asm-mips/irq_cpu.h b/include/asm-mips/irq_cpu.h
index ed3d1e3d09..ef6a07cddb 100644
--- a/include/asm-mips/irq_cpu.h
+++ b/include/asm-mips/irq_cpu.h
@@ -13,8 +13,8 @@
 #ifndef _ASM_IRQ_CPU_H
 #define _ASM_IRQ_CPU_H
 
-extern void mips_cpu_irq_init(int irq_base);
-extern void rm7k_cpu_irq_init(int irq_base);
-extern void rm9k_cpu_irq_init(int irq_base);
+extern void mips_cpu_irq_init(void);
+extern void rm7k_cpu_irq_init(void);
+extern void rm9k_cpu_irq_init(void);
 
 #endif /* _ASM_IRQ_CPU_H */
diff --git a/include/asm-mips/mach-cobalt/cobalt.h b/include/asm-mips/mach-cobalt/cobalt.h
index 00b0fc68d5..24a8d51a55 100644
--- a/include/asm-mips/mach-cobalt/cobalt.h
+++ b/include/asm-mips/mach-cobalt/cobalt.h
@@ -12,6 +12,8 @@
 #ifndef __ASM_COBALT_H
 #define __ASM_COBALT_H
 
+#include <irq.h>
+
 /*
  * i8259 legacy interrupts used on Cobalt:
  *
@@ -25,7 +27,7 @@
 /*
  * CPU IRQs  are 16 ... 23
  */
-#define COBALT_CPU_IRQ          16
+#define COBALT_CPU_IRQ          MIPS_CPU_IRQ_BASE
 
 #define COBALT_GALILEO_IRQ      (COBALT_CPU_IRQ + 2)
 #define COBALT_SCC_IRQ          (COBALT_CPU_IRQ + 3)    /* pre-production has 85C30 */
diff --git a/include/asm-mips/mach-emma2rh/irq.h b/include/asm-mips/mach-emma2rh/irq.h
index bce64244b8..5439eb8564 100644
--- a/include/asm-mips/mach-emma2rh/irq.h
+++ b/include/asm-mips/mach-emma2rh/irq.h
@@ -10,4 +10,6 @@
 
 #define NR_IRQS 256
 
+#include_next <irq.h>
+
 #endif /* __ASM_MACH_EMMA2RH_IRQ_H */
diff --git a/include/asm-mips/mach-generic/irq.h b/include/asm-mips/mach-generic/irq.h
index 500e10ff24..91e6778907 100644
--- a/include/asm-mips/mach-generic/irq.h
+++ b/include/asm-mips/mach-generic/irq.h
@@ -8,6 +8,32 @@
 #ifndef __ASM_MACH_GENERIC_IRQ_H
 #define __ASM_MACH_GENERIC_IRQ_H
 
+#ifndef NR_IRQS
 #define NR_IRQS 128
+#endif
+
+#ifdef CONFIG_IRQ_CPU
+
+#ifndef MIPS_CPU_IRQ_BASE
+#ifdef CONFIG_I8259
+#define MIPS_CPU_IRQ_BASE 16
+#else
+#define MIPS_CPU_IRQ_BASE 0
+#endif /* CONFIG_I8259 */
+#endif
+
+#ifdef CONFIG_IRQ_CPU_RM7K
+#ifndef RM7K_CPU_IRQ_BASE
+#define RM7K_CPU_IRQ_BASE (MIPS_CPU_IRQ_BASE+8)
+#endif
+#endif
+
+#ifdef CONFIG_IRQ_CPU_RM9K
+#ifndef RM9K_CPU_IRQ_BASE
+#define RM9K_CPU_IRQ_BASE (MIPS_CPU_IRQ_BASE+12)
+#endif
+#endif
+
+#endif /* CONFIG_IRQ_CPU */
 
 #endif /* __ASM_MACH_GENERIC_IRQ_H */
diff --git a/include/asm-mips/mach-mips/irq.h b/include/asm-mips/mach-mips/irq.h
index e994b0c012..9b9da26683 100644
--- a/include/asm-mips/mach-mips/irq.h
+++ b/include/asm-mips/mach-mips/irq.h
@@ -4,4 +4,6 @@
 
 #define NR_IRQS 256
 
+#include_next <irq.h>
+
 #endif /* __ASM_MACH_MIPS_IRQ_H */
diff --git a/include/asm-mips/mach-vr41xx/irq.h b/include/asm-mips/mach-vr41xx/irq.h
new file mode 100644
index 0000000000..862058d3f8
--- /dev/null
+++ b/include/asm-mips/mach-vr41xx/irq.h
@@ -0,0 +1,8 @@
+#ifndef __ASM_MACH_VR41XX_IRQ_H
+#define __ASM_MACH_VR41XX_IRQ_H
+
+#include <asm/vr41xx/irq.h> /* for MIPS_CPU_IRQ_BASE */
+
+#include_next <irq.h>
+
+#endif /* __ASM_MACH_VR41XX_IRQ_H */
diff --git a/include/asm-mips/mips-boards/atlasint.h b/include/asm-mips/mips-boards/atlasint.h
index b15e4ea0b0..76add42e48 100644
--- a/include/asm-mips/mips-boards/atlasint.h
+++ b/include/asm-mips/mips-boards/atlasint.h
@@ -26,10 +26,12 @@
 #ifndef _MIPS_ATLASINT_H
 #define _MIPS_ATLASINT_H
 
+#include <irq.h>
+
 /*
  * Interrupts 0..7 are used for Atlas CPU interrupts (nonEIC mode)
  */
-#define MIPSCPU_INT_BASE        0
+#define MIPSCPU_INT_BASE        MIPS_CPU_IRQ_BASE
 
 /* CPU interrupt offsets */
 #define MIPSCPU_INT_SW0         0
diff --git a/include/asm-mips/mips-boards/maltaint.h b/include/asm-mips/mips-boards/maltaint.h
index da6cc2fbbc..9180d64661 100644
--- a/include/asm-mips/mips-boards/maltaint.h
+++ b/include/asm-mips/mips-boards/maltaint.h
@@ -25,6 +25,8 @@
 #ifndef _MIPS_MALTAINT_H
 #define _MIPS_MALTAINT_H
 
+#include <irq.h>
+
 /*
  * Interrupts 0..15 are used for Malta ISA compatible interrupts
  */
@@ -33,7 +35,7 @@
 /*
  * Interrupts 16..23 are used for Malta CPU interrupts (nonEIC mode)
  */
-#define MIPSCPU_INT_BASE        16
+#define MIPSCPU_INT_BASE        MIPS_CPU_IRQ_BASE
 
 /* CPU interrupt offsets */
 #define MIPSCPU_INT_SW0         0
diff --git a/include/asm-mips/mips-boards/seadint.h b/include/asm-mips/mips-boards/seadint.h
index 365c2a3c64..4f6a393369 100644
--- a/include/asm-mips/mips-boards/seadint.h
+++ b/include/asm-mips/mips-boards/seadint.h
@@ -20,10 +20,12 @@
 #ifndef _MIPS_SEADINT_H
 #define _MIPS_SEADINT_H
 
+#include <irq.h>
+
 /*
  * Interrupts 0..7 are used for SEAD CPU interrupts
  */
-#define MIPSCPU_INT_BASE        0
+#define MIPSCPU_INT_BASE        MIPS_CPU_IRQ_BASE
 
 #define MIPSCPU_INT_UART0       2
 #define MIPSCPU_INT_UART1       3
diff --git a/include/asm-mips/mips-boards/simint.h b/include/asm-mips/mips-boards/simint.h
index 4952e0b3bf..54f2fe621d 100644
--- a/include/asm-mips/mips-boards/simint.h
+++ b/include/asm-mips/mips-boards/simint.h
@@ -17,10 +17,11 @@
 #ifndef _MIPS_SIMINT_H
 #define _MIPS_SIMINT_H
 
+#include <irq.h>
 
 #define SIM_INT_BASE            0
 #define MIPSCPU_INT_MB0         2
-#define MIPSCPU_INT_BASE        16
+#define MIPSCPU_INT_BASE        MIPS_CPU_IRQ_BASE
 #define MIPS_CPU_TIMER_IRQ      7
 
 
diff --git a/include/asm-mips/rtlx.h b/include/asm-mips/rtlx.h
index 76cd51c6be..59162f74a7 100644
--- a/include/asm-mips/rtlx.h
+++ b/include/asm-mips/rtlx.h
@@ -6,9 +6,10 @@
 #ifndef __ASM_RTLX_H
 #define __ASM_RTLX_H_
 
+#include <irq.h>
+
 #define LX_NODE_BASE 10
 
-#define MIPSCPU_INT_BASE       16
 #define MIPS_CPU_RTLX_IRQ 0
 
 #define RTLX_VERSION 2
diff --git a/include/asm-mips/sgi/ip22.h b/include/asm-mips/sgi/ip22.h
index bbfc05c3ca..6592f3bd19 100644
--- a/include/asm-mips/sgi/ip22.h
+++ b/include/asm-mips/sgi/ip22.h
@@ -21,15 +21,16 @@
  * HAL2 driver). This will prevent many complications, trust me ;-)
  */
 
+#include <irq.h>
 #include <asm/sgi/ioc.h>
 
 #define SGINT_EISA      0       /* 16 EISA irq levels (Indigo2) */
-#define SGINT_CPU       16      /* MIPS CPU define 8 interrupt sources */
-#define SGINT_LOCAL0    24      /* 8 local0 irq levels */
-#define SGINT_LOCAL1    32      /* 8 local1 irq levels */
-#define SGINT_LOCAL2    40      /* 8 local2 vectored irq levels */
-#define SGINT_LOCAL3    48      /* 8 local3 vectored irq levels */
-#define SGINT_END       56      /* End of 'spaces' */
+#define SGINT_CPU       MIPS_CPU_IRQ_BASE       /* MIPS CPU define 8 interrupt sources */
+#define SGINT_LOCAL0    (SGINT_CPU+8)   /* 8 local0 irq levels */
+#define SGINT_LOCAL1    (SGINT_CPU+16)  /* 8 local1 irq levels */
+#define SGINT_LOCAL2    (SGINT_CPU+24)  /* 8 local2 vectored irq levels */
+#define SGINT_LOCAL3    (SGINT_CPU+32)  /* 8 local3 vectored irq levels */
+#define SGINT_END       (SGINT_CPU+40)  /* End of 'spaces' */
 
 /*
  * Individual interrupt definitions for the Indy and Indigo2