Use PLATFORM for initializing Marvell ArmadaXP and Armada38X

[mkm_semihalf.com]

Summary

Spliting armv5 and armv7 machdep is necessary for adding Armada38X and
ArmadaXP to GENERIC config.
PLATFORM framework checks SOC type in FDT and will select proper
initialization function implementation during runtime.
Pointers to SoC specific implementation are stored in array of
platform_method_t and provided to framework by FDT_PLATFORM_DEF macro.
PLATFORM framework supports also reset function. To simplify implementation
cpu_reset is moved from mv_common to armv5 and armv7 machdep.

Armada38X and ArmadaXP share now common list of files.

[andrew]

sys/arm/conf/ARMADAXP

97

Why is it needed?

sys/arm/mv/armada38x/armada38x_pl310.c

51–52

These should be with the other machine includes above.

sys/arm/mv/armadaxp/armadaxp_mp.c

52

This should be with the other machine includes

sys/arm/mv/armv7_machdep.c

1 ↗

(On Diff #40456)

This file should have a mv_ prefix, e.g. mv_armv7_machdep.c. If not it may conflict with another generic file.

263 ↗

(On Diff #40456)

Do these need to be global?

[mw]

sys/arm/conf/ARMADAXP

97

Hi,

From now on, for Marvell ARMv7 platforms there is a common file (mv_armv7_machdep.c), where PLATFORMMETHODs are assigned, among them 3 PL310-related for Armada 38x:

PLATFORMMETHOD(platform_pl310_init, mv_a38x_platform_pl310_init),
PLATFORMMETHOD(platform_pl310_write_ctrl, mv_a38x_platform_pl310_write_ctrl),
PLATFORMMETHOD(platform_pl310_write_debug, mv_a38x_platform_pl310_write_debug),

All is fine for configs: GENERIC and ARMADA38X, but ARMADAXP compilation will fail. Unless you don't insist on all non-GENERIC configs removal, 'device pl310' must be added to ARMADAXP, so that it can still compile.

[andrew]

sys/arm/conf/ARMADAXP

97

You don't need to include these functions in the kernel when not building for a platform that doesn't support them.

sys/arm/mv/mv_armv7_machdep.c

444–461

You should put these under

#if defined(SOC_MV_ARMADA38X)
...
#endif

[mw]

sys/arm/mv/mv_armv7_machdep.c

444–461

What's actually the purpose of such ifdef? In this file we define methods for A38x / AXP finally reaching the code without any ifdef (SOC_MV_...) and I'd like to keep it this way :)

[mw]

sys/arm/conf/ARMADAXP

97

Right, that makes sense- now I get your point.