u-boot.git/lib/time.c, branch v2021.01

time: Fix get_ticks being non-monotonic

2020-10-14T15:16:34+00:00

get_ticks does not always succeed. Sometimes it can be called before the
timer has been initialized. If it does, it returns a negative errno.
This causes the timer to appear non-monotonic, because the value will
become much smaller after the timer is initialized.

No users of get_ticks which I checked handle errors of this kind. Further,
functions like tick_to_time mangle the result of get_ticks, making it very
unlikely that one could check for an error without suggesting a patch such
as this one.

This patch panics if we ever get an error. There are two cases in which
this can occur. The first is if we couldn't find/probe the timer for some
reason. One reason for this is if the timer is not available so early. This
likely indicates misconfiguration. Another reason is that the timer has an
invalid/missing device tree binding. In this case, panicing is also
correct. The second case covers errors calling get_count. This can only
occur if the timer is missing a get_count function (or on RISC-V, but that
should be fixed soon).

Fixes: c8a7ba9e6a5
Signed-off-by: Sean Anderson 
Reviewed-by: Simon Glass

timer: Allow delays with a 32-bit microsecond timer

2020-07-17T06:32:24+00:00

The current get_timer_us() uses 64-bit arithmetic on 32-bit machines.
When implementing microsecond-level timeouts, 32-bits is plenty. Add a
new function that uses an unsigned long. On 64-bit machines this is
still 64-bit, but this doesn't introduce a penalty. On 32-bit machines
it is more efficient.

Signed-off-by: Simon Glass 
Reviewed-by: Bin Meng

common: Drop linux/delay.h from common header

2020-05-19T01:19:23+00:00

Move this uncommon header out of the common header.

Signed-off-by: Simon Glass

Fix some checkpatch warnings in calls to udelay()

2020-05-19T01:19:23+00:00

Fix up some incorrect code style in calls to functions in the linux/time.h
header, mostly udelay().

Signed-off-by: Simon Glass

common: Drop init.h from common header

2020-05-18T21:33:33+00:00

Move this uncommon header out of the common header.

Signed-off-by: Simon Glass

common: Drop bootstage.h from common header

2020-05-18T21:33:33+00:00

Move this fairly uncommon header out of the common header.

Signed-off-by: Simon Glass

common: Move get_ticks() function out of common.h

2019-12-02T23:23:13+00:00

This function belongs in time.h so move it over and add a comment.

Signed-off-by: Simon Glass 
Reviewed-by: Tom Rini

lib: time: Add microsecond timer

2019-10-31T11:22:53+00:00

Add get_timer_us(), which is useful e.g. when we need higher
precision timestamps.

Signed-off-by: Marek Vasut 
Cc: Tom Rini 
Cc: Simon Glass 
[trini: Fixup arch/arm/mach-bcm283x/include/mach/timer.h]
Signed-off-by: Tom Rini

lib: time: export usec_to_tick()

2019-06-04T20:09:26+00:00

In the UEFI Stall() boottime service we need access to usec_to_tick().

Export the function.

Remove redundant implementation in arch/arm/mach-rockchip/rk_timer.c.

Signed-off-by: Heinrich Schuchardt

lib: time: update module enable MACRO

2019-03-29T14:53:18+00:00

We'd better use correct way to check if module has enabled.
for we have 3 timer MACRO:
- CONFIG_TIMER
- CONFIG_SPL_TIMER
- CONFIG_TPL_TIMER

Signed-off-by: Kever Yang 
Reviewed-by: Philipp Tomsich