i.MX23/i.MX28, software reset feature

[Sascha Hauer]

On Tue, Jun 19, 2012 at 12:29:28PM +0200, Juergen Beisert wrote:
> Hi list,
> 
> currently we use the watchdog to make the "reset" command work on the 
> i.XM23/i.MX28 CPUs. This collides if someone wants to use the watchdog in a 
> regular manner, as Barebox cannot distinguish if the reset was a result of 
> the "reset" command (or "reboot" from Linux) or if something strange happens 
> and the watchdog has barked to reboot and try again (maybe in a different 
> manner).
> 
> The i.XM23/i.MX28 CPUs are coming with a bit in a special register in 
> the "clock generation and control" unit to hard reset the whole SoC. This 
> could be used instead to make the "reset" command work. But the register 
> offsets are different in both SoCs. So:
> 
>  - using ifdefs to distinguish both SoCs in "arch/arm/mach-mxs/reset-imx.c"
>  - or moving the reset_cpu() function into "arch/arm/mach-mxs/speed-imx*.c"
>    where all the required symbols and correct offset are already defined on a
>    per SoC base?

Or add a imx23.c and imx28.c where we could collect the SoC specific
code.

Sascha

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