[MIPS] Make I8259A_IRQ_BASE customizable

Move I8259A_IRQ_BASE from asm/i8259.h to asm/mach-generic/irq.h and
make it really customizable.  And remove I8259_IRQ_BASE declared on
some platforms.  Currently only NEC_CMBVR4133 is using custom
I8259A_IRQ_BASE value.

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

4 files changed, 20 insertions, 71 deletions

diff --git a/arch/mips/ddb5xxx/ddb5477/irq.c b/arch/mips/ddb5xxx/ddb5477/irq.c
index bd7cd7c5f485..2b23234a5b95 100644
--- a/arch/mips/ddb5xxx/ddb5477/irq.c
+++ b/arch/mips/ddb5xxx/ddb5477/irq.c
@@ -146,8 +146,7 @@ u8 i8259_interrupt_ack(void)
         irq = *(volatile u8 *) KSEG1ADDR(DDB_PCI_IACK_BASE);
         ddb_out32(DDB_PCIINIT10, reg);
 
-        /* i8259.c set the base vector to be 0x0 */
-        return irq + I8259_IRQ_BASE;
+        return irq;
 }
 /*
  * the first level int-handler will jump here if it is a vrc5477 irq
@@ -177,7 +176,7 @@ static void vrc5477_irq_dispatch(void)
                 /* check for i8259 interrupts */
                 if (intStatus & (1 << VRC5477_I8259_CASCADE)) {
                         int i8259_irq = i8259_interrupt_ack();
-                        do_IRQ(I8259_IRQ_BASE + i8259_irq);
+                        do_IRQ(i8259_irq);
                         return;
                 }
         }
diff --git a/arch/mips/kernel/i8259.c b/arch/mips/kernel/i8259.c
index b59a676c6d0e..91de4223d638 100644
--- a/arch/mips/kernel/i8259.c
+++ b/arch/mips/kernel/i8259.c
@@ -54,9 +54,11 @@ static unsigned int cached_irq_mask = 0xffff;
 
 void disable_8259A_irq(unsigned int irq)
 {
-        unsigned int mask = 1 << irq;
+        unsigned int mask;
         unsigned long flags;
 
+        irq -= I8259A_IRQ_BASE;
+        mask = 1 << irq;
         spin_lock_irqsave(&i8259A_lock, flags);
         cached_irq_mask |= mask;
         if (irq & 8)
@@ -68,9 +70,11 @@ void disable_8259A_irq(unsigned int irq)
 
 void enable_8259A_irq(unsigned int irq)
 {
-        unsigned int mask = ~(1 << irq);
+        unsigned int mask;
         unsigned long flags;
 
+        irq -= I8259A_IRQ_BASE;
+        mask = ~(1 << irq);
         spin_lock_irqsave(&i8259A_lock, flags);
         cached_irq_mask &= mask;
         if (irq & 8)
@@ -82,10 +86,12 @@ void enable_8259A_irq(unsigned int irq)
 
 int i8259A_irq_pending(unsigned int irq)
 {
-        unsigned int mask = 1 << irq;
+        unsigned int mask;
         unsigned long flags;
         int ret;
 
+        irq -= I8259A_IRQ_BASE;
+        mask = 1 << irq;
         spin_lock_irqsave(&i8259A_lock, flags);
         if (irq < 8)
                 ret = inb(PIC_MASTER_CMD) & mask;
@@ -134,9 +140,11 @@ static inline int i8259A_irq_real(unsigned int irq)
  */
 void mask_and_ack_8259A(unsigned int irq)
 {
-        unsigned int irqmask = 1 << irq;
+        unsigned int irqmask;
         unsigned long flags;
 
+        irq -= I8259A_IRQ_BASE;
+        irqmask = 1 << irq;
         spin_lock_irqsave(&i8259A_lock, flags);
         /*
          * Lightweight spurious IRQ detection. We do not want
@@ -322,8 +330,8 @@ void __init init_i8259_irqs (void)
 
         init_8259A(0);
 
-        for (i = 0; i < 16; i++)
+        for (i = I8259A_IRQ_BASE; i < I8259A_IRQ_BASE + 16; i++)
                 set_irq_chip_and_handler(i, &i8259A_chip, handle_level_irq);
 
-        setup_irq(PIC_CASCADE_IR, &irq2);
+        setup_irq(I8259A_IRQ_BASE + PIC_CASCADE_IR, &irq2);
 }
diff --git a/arch/mips/pci/fixup-vr4133.c b/arch/mips/pci/fixup-vr4133.c
index 597b89764ba1..b1a5b318f26f 100644
--- a/arch/mips/pci/fixup-vr4133.c
+++ b/arch/mips/pci/fixup-vr4133.c
@@ -19,6 +19,7 @@
 #include <linux/pci.h>
 
 #include <asm/io.h>
+#include <asm/i8259.h>
 #include <asm/vr41xx/cmbvr4133.h>
 
 extern int vr4133_rockhopper;
@@ -160,17 +161,7 @@ int rockhopper_get_irq(struct pci_dev *dev, u8 pin, u8 slot)
 #ifdef CONFIG_ROCKHOPPER
 void i8259_init(void)
 {
-        outb(0x11, 0x20);               /* Master ICW1 */
-        outb(I8259_IRQ_BASE, 0x21);     /* Master ICW2 */
-        outb(0x04, 0x21);               /* Master ICW3 */
-        outb(0x01, 0x21);               /* Master ICW4 */
-        outb(0xff, 0x21);               /* Master IMW */
-
-        outb(0x11, 0xa0);               /* Slave ICW1 */
-        outb(I8259_IRQ_BASE + 8, 0xa1); /* Slave ICW2 */
-        outb(0x02, 0xa1);               /* Slave ICW3 */
-        outb(0x01, 0xa1);               /* Slave ICW4 */
-        outb(0xff, 0xa1);               /* Slave IMW */
+        init_i8259_irqs();
 
         outb(0x00, 0x4d0);
         outb(0x02, 0x4d1);      /* USB IRQ9 is level */
diff --git a/arch/mips/vr41xx/nec-cmbvr4133/irq.c b/arch/mips/vr41xx/nec-cmbvr4133/irq.c
index 128ed8d6f111..7d2d076b0f54 100644
--- a/arch/mips/vr41xx/nec-cmbvr4133/irq.c
+++ b/arch/mips/vr41xx/nec-cmbvr4133/irq.c
@@ -21,60 +21,16 @@
 #include <linux/interrupt.h>
 
 #include <asm/io.h>
+#include <asm/i8259.h>
 #include <asm/vr41xx/cmbvr4133.h>
 
-extern void enable_8259A_irq(unsigned int irq);
-extern void disable_8259A_irq(unsigned int irq);
-extern void mask_and_ack_8259A(unsigned int irq);
-extern void init_8259A(int hoge);
-
 extern int vr4133_rockhopper;
 
-static void enable_i8259_irq(unsigned int irq)
-{
-        enable_8259A_irq(irq - I8259_IRQ_BASE);
-}
-
-static void disable_i8259_irq(unsigned int irq)
-{
-        disable_8259A_irq(irq - I8259_IRQ_BASE);
-}
-
-static void ack_i8259_irq(unsigned int irq)
-{
-        mask_and_ack_8259A(irq - I8259_IRQ_BASE);
-}
-
-static struct irq_chip i8259_irq_type = {
-        .typename       = "XT-PIC",
-        .ack            = ack_i8259_irq,
-        .mask           = disable_i8259_irq,
-        .mask_ack       = ack_i8259_irq,
-        .unmask         = enable_i8259_irq,
-};
-
 static int i8259_get_irq_number(int irq)
 {
-        unsigned long isr;
-
-        isr = inb(0x20);
-        irq = ffz(~isr);
-        if (irq == 2) {
-                isr = inb(0xa0);
-                irq = 8 + ffz(~isr);
-        }
-
-        if (irq < 0 || irq > 15)
-                return -EINVAL;
-
-        return I8259_IRQ_BASE + irq;
+        return i8259_irq();
 }
 
-static struct irqaction i8259_slave_cascade = {
-        .handler        = &no_action,
-        .name           = "cascade",
-};
-
 void __init rockhopper_init_irq(void)
 {
         int i;
@@ -84,11 +40,6 @@ void __init rockhopper_init_irq(void)
                 return;
         }
 
-        for (i = I8259_IRQ_BASE; i <= I8259_IRQ_LAST; i++)
-                set_irq_chip_and_handler(i, &i8259_irq_type, handle_level_irq);
-
-        setup_irq(I8259_SLAVE_IRQ, &i8259_slave_cascade);
-
         vr41xx_set_irq_trigger(CMBVR41XX_INTC_PIN, TRIGGER_LEVEL, SIGNAL_THROUGH);
         vr41xx_set_irq_level(CMBVR41XX_INTC_PIN, LEVEL_HIGH);
         vr41xx_cascade_irq(CMBVR41XX_INTC_IRQ, i8259_get_irq_number);