Blackfin: SMP: make core timers per-cpu clock events for HRT

SMP systems require per-cpu local clock event devices in order to enable
HRT support.  One a BF561, we can use local core timer for this purpose.
Originally, there was one global core-timer clock event device set up for
core A.

To accomplish this feat, we need to split the gptimer0/core timer logic
so that each is a standalone clock event.  There is no requirement that
we only have one clock event source anyways.  Once we have this, we just
define per-cpu clock event devices for each local core timer.

Signed-off-by: Yi Li <yi.li@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

2 files changed, 20 insertions, 0 deletions

diff --git a/arch/blackfin/mach-bf561/include/mach/smp.h b/arch/blackfin/mach-bf561/include/mach/smp.h
index 390c7f4ae7b3..2c8c514dd386 100644
--- a/arch/blackfin/mach-bf561/include/mach/smp.h
+++ b/arch/blackfin/mach-bf561/include/mach/smp.h
@@ -25,4 +25,6 @@ void platform_send_ipi_cpu(unsigned int cpu);
 
 void platform_clear_ipi(unsigned int cpu);
 
+void bfin_local_timer_setup(void);
+
 #endif /* !_MACH_BF561_SMP */
diff --git a/arch/blackfin/mach-bf561/smp.c b/arch/blackfin/mach-bf561/smp.c
index ec93f3ef8fa3..90369429ee66 100644
--- a/arch/blackfin/mach-bf561/smp.c
+++ b/arch/blackfin/mach-bf561/smp.c
@@ -11,6 +11,7 @@
 #include <linux/delay.h>
 #include <asm/smp.h>
 #include <asm/dma.h>
+#include <asm/time.h>
 
 static DEFINE_SPINLOCK(boot_lock);
 
@@ -144,3 +145,20 @@ void platform_clear_ipi(unsigned int cpu)
         bfin_write_SICB_SYSCR(bfin_read_SICB_SYSCR() | (1 << (10 + cpu)));
         SSYNC();
 }
+
+/*
+ * Setup core B's local core timer.
+ * In SMP, core timer is used for clock event device.
+ */
+void __cpuinit bfin_local_timer_setup(void)
+{
+#if defined(CONFIG_TICKSOURCE_CORETMR)
+        bfin_coretmr_init();
+        bfin_coretmr_clockevent_init();
+        get_irq_chip(IRQ_CORETMR)->unmask(IRQ_CORETMR);
+#else
+        /* Power down the core timer, just to play safe. */
+        bfin_write_TCNTL(0);
+#endif
+
+}