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3 Commits

Author SHA1 Message Date
Guo Ren
0c87bb0e87 clocksource/drivers/c-sky: fixup ftrace call-graph panic 
We must add notrace on sched_clock_read, because it's called
by ftrace_graph_caller.

Signed-off-by: Guo Ren <ren_guo@c-sky.com>
 2018-12-31 23:17:23 +08:00
Guo Ren
1d95fe4d3d clocksource/drivers/c-sky: fixup qemu fail to bootup sometimes. 
Timer startup must after timer_irq_enable. For qemu, timer tick
irq hanppens but irq not enable, so it will cause qemu boot failed.

Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Tested-by: Liu Zhiwei <zhiwei_liu@c-sky.com>
 2018-12-31 22:58:48 +08:00
Guo Ren
a7ad38b0dd clocksource/drivers/c-sky: Add C-SKY SMP timer 
The driver is for C-SKY SMP timer. It only supports oneshot event
and 32bit overflow for clocksource. Per cpu core has one timer and
all timers share one clock-counter-input from the same clocksource.

This use mfcr&mtcr instructions to access the regs.

Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
 2018-11-02 19:39:54 +01:00