[MIPS] Rewrite all the assembler interrupt handlers to C.

Saves like 1,600 lines of code, is way easier to debug, compilers
frequently do a better job than the cut and paste type of handlers many
boards had.  And finally having all the stuff done in a single place
also means alot of bug potencial for the MT ASE is gone.

The only surviving handler in assembler is the DECstation one; I hope
Maciej will rewrite it.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 23 insertions, 7 deletions

diff --git a/arch/mips/tx4927/common/tx4927_irq.c b/arch/mips/tx4927/common/tx4927_irq.c
index 5ab2e2b76018..8ca68015cf40 100644
--- a/arch/mips/tx4927/common/tx4927_irq.c
+++ b/arch/mips/tx4927/common/tx4927_irq.c
@@ -525,8 +525,6 @@ static void tx4927_irq_pic_end(unsigned int irq)
  */
 void __init tx4927_irq_init(void)
 {
-        extern asmlinkage void tx4927_irq_handler(void);
-
         TX4927_IRQ_DPRINTK(TX4927_IRQ_INIT, "-\n");
 
         TX4927_IRQ_DPRINTK(TX4927_IRQ_INIT, "=Calling tx4927_irq_cp0_init()\n");
@@ -535,16 +533,12 @@ void __init tx4927_irq_init(void)
         TX4927_IRQ_DPRINTK(TX4927_IRQ_INIT, "=Calling tx4927_irq_pic_init()\n");
         tx4927_irq_pic_init();
 
-        TX4927_IRQ_DPRINTK(TX4927_IRQ_INIT,
-                           "=Calling set_except_vector(tx4927_irq_handler)\n");
-        set_except_vector(0, tx4927_irq_handler);
-
         TX4927_IRQ_DPRINTK(TX4927_IRQ_INIT, "+\n");
 
         return;
 }
 
-int tx4927_irq_nested(void)
+static int tx4927_irq_nested(void)
 {
         int sw_irq = 0;
         u32 level2;
@@ -582,3 +576,25 @@ int tx4927_irq_nested(void)
 
         return (sw_irq);
 }
+
+asmlinkage void plat_irq_dispatch(struct pt_regs *regs)
+{
+        unsigned int pending = read_c0_status() & read_c0_cause();
+
+        if (pending & STATUSF_IP7)                      /* cpu timer */
+                do_IRQ(TX4927_IRQ_CPU_TIMER, regs);
+        else if (pending & STATUSF_IP2) {               /* tx4927 pic */
+                unsigned int irq = tx4927_irq_nested();
+
+                if (unlikely(irq == 0)) {
+                        spurious_interrupt(regs);
+                        return;
+                }
+                do_IRQ(irq, regs);
+        } else if (pending & STATUSF_IP0)               /* user line 0 */
+                do_IRQ(TX4927_IRQ_USER0, regs);
+        else if (pending & STATUSF_IP1)                 /* user line 1 */
+                do_IRQ(TX4927_IRQ_USER1, regs);
+        else
+                spurious_interrupt(regs);
+}