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-rw-r--r--arch/mips/mips-boards/malta/malta_int.c102
1 files changed, 96 insertions, 6 deletions
diff --git a/arch/mips/mips-boards/malta/malta_int.c b/arch/mips/mips-boards/malta/malta_int.c
index d06dc5ad6c9e..64db07d4dbe5 100644
--- a/arch/mips/mips-boards/malta/malta_int.c
+++ b/arch/mips/mips-boards/malta/malta_int.c
@@ -40,7 +40,6 @@
#include <asm/mips-boards/msc01_pci.h>
#include <asm/msc01_ic.h>
-extern asmlinkage void mipsIRQ(void);
extern void mips_timer_interrupt(void);
static DEFINE_SPINLOCK(mips_irq_lock);
@@ -114,13 +113,14 @@ static inline int get_int(void)
return irq;
}
-void malta_hw0_irqdispatch(struct pt_regs *regs)
+static void malta_hw0_irqdispatch(struct pt_regs *regs)
{
int irq;
irq = get_int();
- if (irq < 0)
+ if (irq < 0) {
return; /* interrupt has already been cleared */
+ }
do_IRQ(MALTA_INT_BASE+irq, regs);
}
@@ -182,6 +182,92 @@ void corehi_irqdispatch(struct pt_regs *regs)
die("CoreHi interrupt", regs);
}
+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 = s0 & 0xf000;
+ t0 = t0 < 1;
+ t0 = t0 << 2;
+ a0 = a0 - t0;
+ s0 = s0 << t0;
+
+ t0 = s0 & 0xc000;
+ t0 = t0 < 1;
+ t0 = t0 << 1;
+ a0 = a0 - t0;
+ s0 = s0 << t0;
+
+ t0 = s0 & 0x8000;
+ t0 = t0 < 1;
+ //t0 = t0 << 2;
+ a0 = a0 - t0;
+ //s0 = s0 << 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(struct pt_regs *regs)
+{
+ unsigned int pending = read_c0_cause() & read_c0_status() & ST0_IM;
+ int irq;
+
+ irq = irq_ffs(pending);
+
+ if (irq == MIPSCPU_INT_I8259A)
+ malta_hw0_irqdispatch(regs);
+ else if (irq > 0)
+ do_IRQ(MIPSCPU_INT_BASE + irq, regs);
+ else
+ spurious_interrupt(regs);
+}
+
static struct irqaction i8259irq = {
.handler = no_action,
.name = "XT-PIC cascade"
@@ -214,7 +300,6 @@ int __initdata msc_nr_eicirqs = sizeof(msc_eicirqmap)/sizeof(msc_irqmap_t);
void __init arch_init_irq(void)
{
- set_except_vector(0, mipsIRQ);
init_i8259_irqs();
if (!cpu_has_veic)
@@ -240,12 +325,17 @@ void __init arch_init_irq(void)
else if (cpu_has_vint) {
set_vi_handler (MIPSCPU_INT_I8259A, malta_hw0_irqdispatch);
set_vi_handler (MIPSCPU_INT_COREHI, corehi_irqdispatch);
-
+#ifdef CONFIG_MIPS_MT_SMTC
+ setup_irq_smtc (MIPSCPU_INT_BASE+MIPSCPU_INT_I8259A, &i8259irq,
+ (0x100 << MIPSCPU_INT_I8259A));
+ setup_irq_smtc (MIPSCPU_INT_BASE+MIPSCPU_INT_COREHI,
+ &corehi_irqaction, (0x100 << MIPSCPU_INT_COREHI));
+#else /* Not SMTC */
setup_irq (MIPSCPU_INT_BASE+MIPSCPU_INT_I8259A, &i8259irq);
setup_irq (MIPSCPU_INT_BASE+MIPSCPU_INT_COREHI, &corehi_irqaction);
+#endif /* CONFIG_MIPS_MT_SMTC */
}
else {
- set_except_vector(0, mipsIRQ);
setup_irq (MIPSCPU_INT_BASE+MIPSCPU_INT_I8259A, &i8259irq);
setup_irq (MIPSCPU_INT_BASE+MIPSCPU_INT_COREHI, &corehi_irqaction);
}
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