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7 Commits

Author SHA1 Message Date
Jisheng Zhang
36361abc8b clocksource/drivers/vf_pit_timer: Prevent ftrace recursion 
Having a traceable function in the sched_clock() path leads to a recursion
within ftrace and a kernel crash.

We should not trace the pit_read_sched_clock() function. Fix this by adding a
notrace attribute to this function.

Signed-off-by: Jisheng Zhang <jszhang@marvell.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
 2015-10-27 01:33:58 +01:00
Viresh Kumar
9552a6af8c clockevents/drivers/vf_pit: Migrate to new 'set-state' interface 
Migrate vf_pit driver to the new 'set-state' interface provided by
clockevents core, the earlier 'set-mode' interface is marked obsolete
now.

This also enables us to implement callbacks for new states of clockevent
devices, for example: ONESHOT_STOPPED.

Cc: Jingchang Lu <b35083@freescale.com>
Cc: Stefan Agner <stefan@agner.ch>
Cc: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Acked-by: Stefan Agner <stefan@agner.ch>
 2015-08-10 11:40:50 +02:00
Stefan Agner
04f7e3e513 clocksource: vf_pit_timer: Support shutdown mode 
In order to avoid waking up the system in a low power mode, the
clocksource should not generate interrupts anymore. Disable the PIT
timer interrupt when changing into the CLOCK_EVT_MODE_SHUTDOWN mode.

[dlezcano] : remove superfluous empty line

Signed-off-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Acked-by: Bill Pringlemeir <bpringlemeir@nbsps.com>
 2014-09-29 01:50:05 +02:00
Stefan Agner
224aa3ed45 clocksource: vf_pit_timer: use complement for sched_clock reading 
Vybrids PIT register is monitonic decreasing. However, sched_clock
reading needs to be monitonic increasing. Use bitwise not to get
the complement of the clock register. This fixes the clock going
backward. Also, the clock now starts at 0 since we load the
register with the maximum value at start.

Signed-off-by: Stefan Agner <stefan@agner.ch>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
Cc: daniel.lezcano@linaro.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux@arm.linux.org.uk
Link: http://lkml.kernel.org/r/d25af915993aec1b486be653eb86f748ddef54fe.1394057313.git.stefan@agner.ch
Cc: stable@vger.kernel.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
 2014-03-06 11:34:14 +01:00
Stephen Boyd
f4e6e1ea19 clocksource: vf_pit_timer: Switch to sched_clock_register() 
The 32 bit sched_clock interface now supports 64 bits. Upgrade to
the 64 bit function to allow us to remove the 32 bit registration
interface.

Cc: Jingchang Lu <b35083@freescale.com>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: John Stultz <john.stultz@linaro.org>
 2013-07-30 11:24:56 -07:00
Fabio Estevam
2699339361 clocksource: vf_pit_timer: Use linux/sched_clock.h 
Commit 38ff87f7 (sched_clock: Make ARM's sched_clock generic for all
architectures) changed the header to <linux/sched_clock.h>, so adapt
it in order to fix the following build error:

drivers/clocksource/vf_pit_timer.c:15:29: fatal error: asm/sched_clock.h: No such file or directory

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Cc: shawn.guo@linaro.org
Cc: sboyd@codeaurora.org
Cc: john.stultz@linaro.org
Link: http://lkml.kernel.org/r/1372116008-2323-1-git-send-email-festevam@gmail.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
 2013-06-25 01:41:48 +02:00
Jingchang Lu
c19672492d clocksource: Add Freescale Vybrid pit timer support 
Add Freescale Vybrid Family period interrupt timer support.

Signed-off-by: Jingchang Lu <b35083@freescale.com>
Reviewed-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
 2013-06-06 17:23:13 +02:00