treewide: remove references to CREDITS ...

The CREDITS file was removed from barebox in 2015 by commit 6570288f2d97
("Remove the CREDITS file"). Remove references to it from several files.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

common: fix typos found with codespell ...

Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Merge branch 'for-next/imx8mq'

common: clock: Sample time before poller_call() ...

Change is_timeout() to sample current time before invoking poller
infrascructure to avoid occasional false timeout conditions.

Consider the following timeout loop (can be found in wait_on_timeout):

        while (!(condition)) {
	        if (is_timeout(...)) {
	       	        return -ETIMEDOUT;
                }
        }
	...

in the original logic of is_timeout() it was possible to end up in the
following situation:

        1. Immediate check of of "condition" yeilds false (not enough
           time for it to become true has passed yet)

	2. is_timeout is called which, in turn, calls poller_call()

	3. All registerd pollers take more than specified timeout time
	   to execute.

	4. Sometime during poller_call() "contition" becomes true

	5. As a result of #3 is_timeout() returns "true"

	6. Code bails out with -ETIMEDOUT early even though timeout
	   condition didn't really occur.

One concrete example of this problem was discovered on ZII RDU1
board (poller_call() is long due to a serdev) when doing large data
transfers over SPI to attached DataFlash chip.

This commit changes is_timeout() to sample the value of time before
calling poller_call(). This way first call to is_timeout() will almost
always return false thus checking the condition at least twice before
declaring a timeout.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

clock: Use udelay() to implement mdelay() ...

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

clock: initialize dummy clocksource statically ...

Assigning the dummy clocksource in a initcall has the problem that
get_time_ns() crashes before that initcall is executed. This happens
when dmesg support is enabled in conjunction with CONFIG_DEBUG_INITCALLS.
In this case the dmesg code wants to have the timestamp of a log
message.
Solve this by setting the current clocksource to the dummy clock
statically and not at runtime. This way we always have a dummy
clock available.

Fixes:
commit 8972eb7
Author: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Date:   Fri Mar 3 13:34:02 2017 +0100

    clocksource: move dummy clock source to init_clock

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

clocksource: move dummy clock source to init_clock ...

And registered it as soon as possible (at pure initcall).
So we not need to check the cs all the time.
As get_time_ns() is one of the most called function of barebox at runtime.

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

clocksource: allow to have multiple device from clock source ...

use the one with the most priority.

We can not select the clocksource at user level.

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

common: clock: introduce mdelay_non_interruptible() ...

Signed-off-by: Peter Mamonov <pmamonov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

clock: incorporate dummy clocksource into core clock code ...

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

clock.c: fix whitespaces ...

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

clock: make get_time_ns() safe to be called without clocksource ...

make it possible to call get_time_ns() before the clocksource
has been registered. Just return 0 in this case which is still
better than crashing the system.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

clock: Add a variable with the first timestamp after startup ...

For measuring the startup time it's useful to save the first
timestamp after the clocksource has been registered.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

clock: introduce non interruptible timeout ...

is_timeout call poller_call if the timeout is >= 100us

but on 1-wire bus we need to wait 500us and not more than 930us
for the bus reset. So if the poller_call is caller we can not guarantee it.

So for this introduce is_non_interruptible_timeout than we only wait.

Use it for ndelay too.

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Treewide: remove address of the Free Software Foundation ...

The FSF address has changed in the past. Instead of updating it
each time the address changes, just drop it completely treewide.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

poller_call: move from getc to is_timeout ...

this will allow to always call poller_call even durring timeout
and still the case in getc

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

shift and clocksource ...

Added clocks_calc_mult_shift()

Signed-off-by: Carlo Caione <carlo.caione@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

clock: fix possible error on overflow in is_timeout ...

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

clock.c: use USECOND and MSECOND ...

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

clocK: Add ndelay function ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

002-clock-overflow ...

[Patch 02/17] U-Boot-V2: Handle case of clock rollover for get_time_ns

get_time_ns does a simplistic delta = cycle_now - cycle_last. It is possible that the h/w counter reached max and reset back to 0.
This patch addresses this issue by checking for rollover condition.

NOTE 1: This does not guarentee that you cannot confuse get_time_ns. You could possibly wait for two reset cycles and then get a messed up value.
To fix that we may need interrupt mode timer tick - something on the lines of jiffies on linux.
NOTE 2: the question of cs->mask is not clear. if the mask is for the tick, then it is better done with (cycle_now & cs->mask) - (cs->cycle_last & cs->mask).

Signed-off-by: Nishanth Menon<x0nishan@ti.com>

export symbols

svn_rev_706 ...

add file headers

svn_rev_683 ...

more cleanups, fix compiler warnings

svn_rev_083 ...

mx31/move_include_asm-arm_arch-arm1136_to_arch-omap24xx.diff

svn_rev_033 ...

change to clocksource api

svn_rev_031 ...

add clocksource stuff from kernel and first implementation (imx) (WIP)