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authorRalf Baechle <ralf@linux-mips.org>2005-08-17 17:44:08 +0000
committerRalf Baechle <ralf@linux-mips.org>2005-10-29 19:32:10 +0100
commit340ee4b98c0543b5632cac975a7449a2d28762d8 (patch)
tree94b7315d53d6eadd145c8691f0a9925f5ae389f5 /arch/mips/mips-boards/generic/time.c
parentd03d0a57754cb820d318d2234c60b728eb38a94d (diff)
Virtual SMP support for the 34K.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/mips-boards/generic/time.c')
-rw-r--r--arch/mips/mips-boards/generic/time.c51
1 files changed, 46 insertions, 5 deletions
diff --git a/arch/mips/mips-boards/generic/time.c b/arch/mips/mips-boards/generic/time.c
index 3a6f1428b2c..72a12d931cb 100644
--- a/arch/mips/mips-boards/generic/time.c
+++ b/arch/mips/mips-boards/generic/time.c
@@ -61,6 +61,15 @@ static unsigned int display_count = 0;
static unsigned int timer_tick_count=0;
static int mips_cpu_timer_irq;
+static inline void scroll_display_message(void)
+{
+ if ((timer_tick_count++ % HZ) == 0) {
+ mips_display_message(&display_string[display_count++]);
+ if (display_count == MAX_DISPLAY_COUNT)
+ display_count = 0;
+ }
+}
+
static void mips_timer_dispatch (struct pt_regs *regs)
{
do_IRQ (mips_cpu_timer_irq, regs);
@@ -68,17 +77,42 @@ static void mips_timer_dispatch (struct pt_regs *regs)
irqreturn_t mips_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
+#ifdef CONFIG_SMP
+ int cpu = smp_processor_id();
+
+ if (cpu == 0) {
+ /*
+ * CPU 0 handles the global timer interrupt job and process accounting
+ * resets count/compare registers to trigger next timer int.
+ */
+ (void) timer_interrupt(irq, dev_id, regs);
+ scroll_display_message();
+ }
+ else {
+ /* Everyone else needs to reset the timer int here as
+ ll_local_timer_interrupt doesn't */
+ /*
+ * FIXME: need to cope with counter underflow.
+ * More support needs to be added to kernel/time for
+ * counter/timer interrupts on multiple CPU's
+ */
+ write_c0_compare (read_c0_count() + (mips_hpt_frequency/HZ));
+ /*
+ * other CPUs should do profiling and process accounting
+ */
+ local_timer_interrupt (irq, dev_id, regs);
+ }
+
+ return IRQ_HANDLED;
+#else
irqreturn_t r;
r = timer_interrupt(irq, dev_id, regs);
- if ((timer_tick_count++ % HZ) == 0) {
- mips_display_message(&display_string[display_count++]);
- if (display_count == MAX_DISPLAY_COUNT)
- display_count = 0;
- }
+ scroll_display_message();
return r;
+#endif
}
/*
@@ -176,6 +210,13 @@ void __init mips_timer_setup(struct irqaction *irq)
irq->handler = mips_timer_interrupt; /* we use our own handler */
setup_irq(mips_cpu_timer_irq, irq);
+#ifdef CONFIG_SMP
+ /* irq_desc(riptor) is a global resource, when the interrupt overlaps
+ on seperate cpu's the first one tries to handle the second interrupt.
+ The effect is that the int remains disabled on the second cpu.
+ Mark the interrupt with IRQ_PER_CPU to avoid any confusion */
+ irq_desc[mips_cpu_timer_irq].status |= IRQ_PER_CPU;
+#endif
/* to generate the first timer interrupt */
write_c0_compare (read_c0_count() + mips_hpt_frequency/HZ);