MIPS: Malta: Use generic plat_irq_dispatch

The generic plat_irq_dispatch provided in irq_cpu.c is sufficient for
dispatching interrupts on Malta in legacy and vectored interrupt modes.

Signed-off-by: Andrew Bresticker <abrestic@chromium.org>
Reviewed-by: Qais Yousef <qais.yousef@imgtec.com>
Tested-by: Qais Yousef <qais.yousef@imgtec.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Jeffrey Deans <jeffrey.deans@imgtec.com>
Cc: Markos Chandras <markos.chandras@imgtec.com>
Cc: Paul Burton <paul.burton@imgtec.com>
Cc: Jonas Gorski <jogo@openwrt.org>
Cc: John Crispin <blogic@openwrt.org>
Cc: David Daney <ddaney.cavm@gmail.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/7821/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

diff --git a/arch/mips/mti-malta/malta-int.c b/arch/mips/mti-malta/malta-int.c
index c6b3548..bcab0b1 100644 (file)
--- a/arch/mips/mti-malta/malta-int.c
+++ b/arch/mips/mti-malta/malta-int.c
@@ -190,92 +190,6 @@ static irqreturn_t corehi_handler(int irq, void *dev_id)
        return IRQ_HANDLED;
 }
 
-static inline int clz(unsigned long x)
-{
-       __asm__(
-       "       .set    push                                    \n"
-       "       .set    mips32                                  \n"
-       "       clz     %0, %1                                  \n"
-       "       .set    pop                                     \n"
-       : "=r" (x)
-       : "r" (x));
-
-       return x;
-}
-
-/*
- * Version of ffs that only looks at bits 12..15.
- */
-static inline unsigned int irq_ffs(unsigned int pending)
-{
-#if defined(CONFIG_CPU_MIPS32) || defined(CONFIG_CPU_MIPS64)
-       return -clz(pending) + 31 - CAUSEB_IP;
-#else
-       unsigned int a0 = 7;
-       unsigned int t0;
-
-       t0 = pending & 0xf000;
-       t0 = t0 < 1;
-       t0 = t0 << 2;
-       a0 = a0 - t0;
-       pending = pending << t0;
-
-       t0 = pending & 0xc000;
-       t0 = t0 < 1;
-       t0 = t0 << 1;
-       a0 = a0 - t0;
-       pending = pending << t0;
-
-       t0 = pending & 0x8000;
-       t0 = t0 < 1;
-       /* t0 = t0 << 2; */
-       a0 = a0 - t0;
-       /* pending = pending << t0; */
-
-       return a0;
-#endif
-}
-
-/*
- * IRQs on the Malta board look basically (barring software IRQs which we
- * don't use at all and all external interrupt sources are combined together
- * on hardware interrupt 0 (MIPS IRQ 2)) like:
- *
- *     MIPS IRQ        Source
- *     --------        ------
- *            0        Software (ignored)
- *            1        Software (ignored)
- *            2        Combined hardware interrupt (hw0)
- *            3        Hardware (ignored)
- *            4        Hardware (ignored)
- *            5        Hardware (ignored)
- *            6        Hardware (ignored)
- *            7        R4k timer (what we use)
- *
- * We handle the IRQ according to _our_ priority which is:
- *
- * Highest ----            R4k Timer
- * Lowest  ----            Combined hardware interrupt
- *
- * then we just return, if multiple IRQs are pending then we will just take
- * another exception, big deal.
- */
-
-asmlinkage void plat_irq_dispatch(void)
-{
-       unsigned int pending = read_c0_cause() & read_c0_status() & ST0_IM;
-       int irq;
-
-       if (unlikely(!pending)) {
-               spurious_interrupt();
-               return;
-       }
-
-       irq = irq_ffs(pending);
-
-       do_IRQ(MIPS_CPU_IRQ_BASE + irq);
-}
-
 #ifdef CONFIG_MIPS_MT_SMP
 
 #define MIPS_CPU_IPI_RESCHED_IRQ 0     /* SW int 0 for resched */
@@ -438,12 +352,6 @@ void __init arch_init_irq(void)
                        cpu_ipi_resched_irq = MSC01E_INT_SW0;
                        cpu_ipi_call_irq = MSC01E_INT_SW1;
                } else {
-                       if (cpu_has_vint) {
-                               set_vi_handler (MIPS_CPU_IPI_RESCHED_IRQ,
-                                       ipi_resched_dispatch);
-                               set_vi_handler (MIPS_CPU_IPI_CALL_IRQ,
-                                       ipi_call_dispatch);
-                       }
                        cpu_ipi_resched_irq = MIPS_CPU_IRQ_BASE +
                                MIPS_CPU_IPI_RESCHED_IRQ;
                        cpu_ipi_call_irq = MIPS_CPU_IRQ_BASE +