Nothing about the sched_clock implementation in the ARM port is
specific to the architecture. Generalize the code so that other
architectures can use it by selecting GENERIC_SCHED_CLOCK.
Signed-off-by: NStephen Boyd <sboyd@codeaurora.org>
[jstultz: Merge minor collisions with other patches in my tree]
Signed-off-by: NJohn Stultz <john.stultz@linaro.org>

Fix the following build error:

drivers/clocksource/mxs_timer.c:304:1: error: expected ',' or ';' at end of input
Signed-off-by: NFabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

Move mxs timer driver into drivers/clocksource as mxs_timer.c.
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

Select STMP_DEVICE and in timer code replace mxs_reset_block() with
stmp_reset_block(), use STMP_OFFSET_REG_SET/CLR to replace
__mxs_setl/clrl.

As the result, <mach/mxs.h> and <mach/common.h> includsion can be
removed from timer.c now.
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

Remove cpu_is_mx23() call from timer code by using
of_device_is_compatible() instead.
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

Instead of using static defines, it gets timrot base address with
mapping from device tree.
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

Change call clk_get_sys() to of_clk_get() to look up timrot clock from
device tree, so that the clk_register_clkdev() call for timrot can be
saved in clock driver.
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

Select CLKSRC_OF and use clocksource_of_init() to initialize timer, so
that the call to mxs_timer_init() in clock driver can be removed.
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

Signed-off-by: NTorben Hohn <torbenh@linutronix.de>
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

timer resolution of ~32us is pretty low.
v2 has 32bits resolution, so we have quite some headroom, and
can use the 24MHz clock.
v1 has only 16bits, so we only increase v2.

So we just exchange the timrot clock in imx28.
On imx23 we have timrotv1 and everything stays the same.
Signed-off-by: NTorben Hohn <torbenh@linutronix.de>
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

The clockevent core is able to figure out the best mult and shift,
calculate min_delta_ns and max_delta_ns, with the necessary info passed
into clockevents_config_and_register().  Use this combined configure
and register function where possible to make the codes less error prone
and gain some positive diff stat.
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>
Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
Reviewed-by: NAnton Vorontsov <cbouatmailru@gmail.com>
Acked-by: NKukjin Kim <kgene.kim@samsung.com>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Jason Cooper <jason@lakedaemon.net>
Tested-by: NRoland Stigge <stigge@antcom.de>
Acked-by: NEric Miao <eric.y.miao@gmail.com>
Cc: Haojian Zhuang <haojian.zhuang@gmail.com>
Cc: David Brown <davidb@codeaurora.org>
Tested-by: NTony Lindgren <tony@atomide.com>
Acked-by: NBarry Song <baohua.song@csr.com>
Tested-by: NStephen Warren <swarren@nvidia.com>
Acked-by: NTony Prisk <linux@prisktech.co.nz>
Cc: Lennert Buytenhek <buytenh@wantstofly.org>
Cc: Wan ZongShun <mcuos.com@gmail.com>
Acked-by: NViresh Kumar <viresh.kumar@linaro.org>
Acked-by: NArnd Bergmann <arnd@arndb.de>
Acked-by: NJason Cooper <jason@lakedaemon.net>
Reviewed-by: NThomas Gleixner <tglx@linutronix.de>
Signed-off-by: NOlof Johansson <olof@lixom.net>

Setup scheduler clock on ARM MXS platforms with a 32-bit timrot
such as i.MX28. This allows the scheduler to use sub-jiffy resolution.

The corresponding change for 16-bit v1 timrots is not possible
at the moment due to rounding issues with clock values wrapping
faster than once per several seconds in the common ARM platform code.
Signed-off-by: NStanislav Meduna <stano@meduna.org>
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

Rather than using the static timer irq definition, we should retrieve
timer irq from device tree for better.
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

With old mxs clock support removed, the timer_clk argument of
mxs_timer_init is unused now, so remove it.
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

When mxs_timer_init() does not have a timer_clk passed in, it should
try to request clock from clkdev system.
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

The patch converts mxs platform code to clk_prepare/clk_unprepare
by using helper functions clk_prepare_enable/clk_disable_unprepare.
Signed-off-by: NRichard Zhao <richard.zhao@linaro.org>
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

Convert the MXS timrotv2 32-bit down counting clocksource to the
generic clocksource infrastructure.

Cc: Sascha Hauer <kernel@pengutronix.de>
Acked-by: NShawn Guo <shawn.guo@freescale.com>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

There are 2 versions of the timrot on Freescale MXS-based SoCs.
The v1 on MX23 only gets 16 bits counter, while v2 on MX28
extends the counter to 32 bits.

The implementation uses two timers, one for clock_event and
another for clocksource. MX28 uses timrot 0 and 1, while MX23
uses 0 and 2.
Signed-off-by: NShawn Guo <shawn.guo@freescale.com>
Signed-off-by: NUwe Kleine-König <u.kleine-koenig@pengutronix.de>