[PATCH v6 01/26] ARM: shmobile: Add watchdog support

[geert@linux-m68k.org (Geert Uytterhoeven)]

Hi Fabrizio,

On Wed, Feb 28, 2018 at 6:40 PM, Fabrizio Castro
<fabrizio.castro@bp.renesas.com> wrote:
> On R-Car Gen2 and RZ/G1 platforms, we use the SBAR registers to make non
> boot CPUs run a routine designed to bring up SMP and deal with hot plug.
> The value contained in the SBAR registers is not initialized by a WDT
> triggered reset, which means that after a WDT triggered reset we jump
> to the SMP bring up routine, preventing the system from executing the
> bootrom code.
>
> The purpose of this patch is to jump to the bootrom code in case of a
> WDT triggered reset, and keep the SMP functionality untouched.
> In order to tell if the code had been called due to the WDT overflowing
> we are testing WOVF from register RWTCSRA.
>
> The new function shmobile_boot_vector_gen2 isn't replacing
> shmobile_boot_vector for backward compatibility reasons. The kernel
> will install the best option (either shmobile_boot_vector or
> shmobile_boot_vector_gen2) to ICRAM1 after parsing the device tree,
> according to the amount of memory available.
>
> Since shmobile_boot_vector has become bigger, "reg" property of nodes
> compatible with "renesas,smp-sram" now need to be set to a value
> greater or equal to "<0 0x60>".
>
> Signed-off-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
> Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram@bp.renesas.com>
> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
> ---
> v5->v6:
> * taken ifdefs out as per Geert's suggestion.

My intention was to remove the #ifdefs from the header file only, not
from arch/arm/mach-shmobile/headsmp.S, as the latter is used for
other SoC families, too.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert at linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds