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mips: Add CONFIG_MIPS_MACH_EARLY_INIT for very early mach init code

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This patch adds the optional call to mips_mach_early_init() to start.S
at a very early stage. Its disabled per default. It can be used for
very early machine / platform specific init code.  Its called very
early and at this stage the PC is allowed to differ from the linking
address (CONFIG_TEXT_BASE) as no absolute jump has been performed until
this call.

It will be used by thje Octeon platform.

Signed-off-by: Stefan Roese <sr@denx.de>
Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
This commit is contained in:
Stefan Roese 2020-06-30 12:33:16 +02:00 committed by Daniel Schwierzeck
parent 81d4b14f7e
commit de34a61642
2 changed files with 14 additions and 0 deletions
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9
arch/mips/Kconfig
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@ -270,6 +270,15 @@ config MIPS_CACHE_INDEX_BASE
Normally this is CKSEG0. If the MIPS system needs to move this block Normally this is CKSEG0. If the MIPS system needs to move this block
to some SRAM or ScratchPad RAM, adapt this option accordingly. to some SRAM or ScratchPad RAM, adapt this option accordingly.
config MIPS_MACH_EARLY_INIT
bool "Enable mach specific very early init code"
help
Use this to enable the call to mips_mach_early_init() very early
from start.S. This function can be used e.g. to do some very early
CPU / SoC intitialization or image copying. Its called very early
and at this stage the PC might not match the linking address
(CONFIG_TEXT_BASE) - no absolute jump done until this call.
config MIPS_CACHE_SETUP config MIPS_CACHE_SETUP
bool "Allow generic start code to initialize and setup caches" bool "Allow generic start code to initialize and setup caches"
default n if SKIP_LOWLEVEL_INIT default n if SKIP_LOWLEVEL_INIT

5
arch/mips/cpu/start.S
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@ -236,6 +236,11 @@ wr_done:
# endif # endif
#endif #endif
#ifdef CONFIG_MIPS_MACH_EARLY_INIT
bal mips_mach_early_init
nop
#endif
#ifdef CONFIG_MIPS_CACHE_SETUP #ifdef CONFIG_MIPS_CACHE_SETUP
/* Initialize caches... */ /* Initialize caches... */
PTR_LA t9, mips_cache_reset PTR_LA t9, mips_cache_reset