[U-Boot] arm: armv7: add us timer for bootstage

[Tom Rini]

On Tue, Nov 22, 2016 at 05:31:33PM +0100, Patrick Delaunay wrote:

> From: Patrick Delaunay <patrick.delaunay at st.com>
> 
> solve issue when bootstage is used with armV7 generic timer
> first call of timer_get_boot_us() use the function get_timer()
> before timer initialization (arch.timer_rate_hz = 0)
> => div by 0
> 
> Commit-notes
> 
> When I activate bootstage on ARMV7 architecture with platform
> using the generic armv7 timer defined in file
> ./arch/arm/cpu/armv7m/timer.c
> 
> I have a issue because gd->arch.timer_rate_hz = 0
> 
> For me the get_timer() function should not used before timer_init
> (which initialize gd->arch.timer_rate_hz) at least for the ARMV7
> timer.
> 
> But in the init sequence, the first bootstage fucntion is called
> before timer_init and this function use the timer function.
> 
> For me it is a error in the generic init sequence :
> mark_bootstage is called before timer_init.
> 
> static init_fnc_t init_sequence_f[] = {
> ....
>     arch_cpu_init_dm,
>     mark_bootstage,        /* need timer, go after init dm */
> ...
> #if defined(CONFIG_ARM) || defined(CONFIG_MIPS) || \
>         defined(CONFIG_BLACKFIN) || defined(CONFIG_NDS32) || \
>         defined(CONFIG_SPARC)
>     timer_init,        /* initialize timer */
> #endif
> .......
> 
> To solve the issue for all the paltform, we can move timer_init()
> call just before mark_bootstage() in this array...
> 
> It should be ok for ARMV7 but I don't sure for other platform
> impacted
> - the other ARM platform or ARMV7 wich don't use generic timer
> - MIPS BLACKFIN NDS32 or SPARC
> 
> and I don't sure of impact for other function called
> (board_early_init_f for example....)
> 
> => This patch solve issue only in timer armv7
>    get_boot_us() can be called everytime without div by 0 issue
>    (gd->arch.timer_rate_hz is not used)
> 
> END
> 
> Signed-off-by: Patrick Delaunay <patrick.delaunay at st.com>
> Signed-off-by: Patrick Delaunay <patrick.delaunay73 at gmail.com>

Applied to u-boot/master, thanks!

-- 
Tom
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