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

[firefly-linux-kernel-4.4.55.git] / arch / mips / jazz / irq.c

diff --git a/arch/mips/jazz/irq.c b/arch/mips/jazz/irq.c
index b309b1bcf2e87926117e1de16ea2b835107b96c2..becc9accd49573e5d24e052a8e3d8e2e40699339 100644 (file)
--- a/arch/mips/jazz/irq.c
+++ b/arch/mips/jazz/irq.c
@@ -15,8 +15,6 @@
 #include <asm/io.h>
 #include <asm/jazz.h>
 
-extern asmlinkage void jazz_handle_int(void);
-
 static DEFINE_SPINLOCK(r4030_lock);
 
 static void enable_r4030_irq(unsigned int irq)
@@ -90,10 +88,82 @@ void __init init_r4030_ints(void)
  */
 void __init arch_init_irq(void)
 {
-       set_except_vector(0, jazz_handle_int);
-
        init_i8259_irqs();                      /* Integrated i8259  */
        init_r4030_ints();
 
        change_c0_status(ST0_IM, IE_IRQ4 | IE_IRQ3 | IE_IRQ2 | IE_IRQ1);
 }
+
+static void loc_call(unsigned int irq, struct pt_regs *regs, unsigned int mask)
+{
+       r4030_write_reg16(JAZZ_IO_IRQ_ENABLE,
+                         r4030_read_reg16(JAZZ_IO_IRQ_ENABLE) & mask);
+       do_IRQ(irq, regs);
+       r4030_write_reg16(JAZZ_IO_IRQ_ENABLE,
+                         r4030_read_reg16(JAZZ_IO_IRQ_ENABLE) | mask);
+}
+
+static void ll_local_dev(struct pt_regs *regs)
+{
+       switch (r4030_read_reg32(JAZZ_IO_IRQ_SOURCE)) {
+       case 0:
+               panic("Unimplemented loc_no_irq handler");
+               break;
+       case 4:
+               loc_call(JAZZ_PARALLEL_IRQ, regs, JAZZ_IE_PARALLEL);
+               break;
+       case 8:
+               loc_call(JAZZ_PARALLEL_IRQ, regs, JAZZ_IE_FLOPPY);
+               break;
+       case 12:
+               panic("Unimplemented loc_sound handler");
+               break;
+       case 16:
+               panic("Unimplemented loc_video handler");
+               break;
+       case 20:
+               loc_call(JAZZ_ETHERNET_IRQ, regs, JAZZ_IE_ETHERNET);
+               break;
+       case 24:
+               loc_call(JAZZ_SCSI_IRQ, regs, JAZZ_IE_SCSI);
+               break;
+       case 28:
+               loc_call(JAZZ_KEYBOARD_IRQ, regs, JAZZ_IE_KEYBOARD);
+               break;
+       case 32:
+               loc_call(JAZZ_MOUSE_IRQ, regs, JAZZ_IE_MOUSE);
+               break;
+       case 36:
+               loc_call(JAZZ_SERIAL1_IRQ, regs, JAZZ_IE_SERIAL1);
+               break;
+       case 40:
+               loc_call(JAZZ_SERIAL2_IRQ, regs, JAZZ_IE_SERIAL2);
+               break;
+       }
+}
+
+asmlinkage void plat_irq_dispatch(struct pt_regs *regs)
+{
+       unsigned int pending = read_c0_cause() & read_c0_status() & ST0_IM;
+
+       if (pending & IE_IRQ5)
+               write_c0_compare(0);
+       else if (pending & IE_IRQ4) {
+               r4030_read_reg32(JAZZ_TIMER_REGISTER);
+               do_IRQ(JAZZ_TIMER_IRQ, regs);
+       } else if (pending & IE_IRQ3)
+               panic("Unimplemented ISA NMI handler");
+       else if (pending & IE_IRQ2)
+               do_IRQ(r4030_read_reg32(JAZZ_EISA_IRQ_ACK), regs);
+       else if (pending & IE_IRQ1) {
+               ll_local_dev(regs);
+       } else if (unlikely(pending & IE_IRQ0))
+               panic("Unimplemented local_dma handler");
+       else if (pending & IE_SW1) {
+               clear_c0_cause(IE_SW1);
+               panic("Unimplemented sw1 handler");
+       } else if (pending & IE_SW0) {
+               clear_c0_cause(IE_SW0);
+               panic("Unimplemented sw0 handler");
+       }
+}