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authorYi Li <yi.li@analog.com>2009-12-28 10:21:49 +0000
committerMike Frysinger <vapier@gentoo.org>2010-03-09 00:30:48 -0500
commit0d152c27e336b5fd777da7dd3e814617e7305afd (patch)
tree2863b1b2f0fe0676a5928b197c8d1d289ab71777 /arch/blackfin/mach-bf561/smp.c
parent682f5dc4ed7cdef1f55e40ee505c4346dfa6fa91 (diff)
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>
Diffstat (limited to 'arch/blackfin/mach-bf561/smp.c')
-rw-r--r--arch/blackfin/mach-bf561/smp.c18
1 files changed, 18 insertions, 0 deletions
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
+
+}