treewide: remove references to CREDITS ...

The CREDITS file was removed from barebox in 2015 by commit 6570288f2d97
("Remove the CREDITS file"). Remove references to it from several files.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: Move mmu_disable to mmu.c ...

mmu_64 has mmu_disable() in mmu_64.c. Move to mmu.c for the 32bit
case aswell to be consistent.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: shutdown: Fix compiler warning ...

On aarch64 we get a unused variable warning. Move the variable
declaration into the #ifdef where the variable is used.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: rename flush_icache to icache_invalidate ...

flush_icache is a misnomer since the icache is invalidated, not
flushed. Rename the function accordingly.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

arm: cpu: add basic arm64 mmu support ...

This commit adds basic mmu support, ie:
        - DMA cache handling is not supported
        - Remapping memory region also

The current mmu setting is:
        - 4KB granularity
        - 3 level lookup (skipping L0)
        - 33 bits per VA

This is based on coreboot and u-boot mmu configuration.

Signed-off-by: Raphael Poggi <poggi.raph@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

arm: cpu: disable code portion in armv8 case ...

Enclosed by #if directive OMAP specific code
and mmu_disable (ARMv8 code will implemented it somewhere else).

Signed-off-by: Raphael Poggi <poggi.raph@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: Remove do_execute and thumb2_execute ...

In commit 104a6a7 support was added
for Thumb2.  It added do_execute() as a way to provide arch dependent
calling veneers for use in "go" and thumb2_execute() as the thumb2 to
arm veneer.

But thumb2_execute() isn't necessary as gcc generates a proper calling
sequence from a standard function pointer call.  Thumb2 barebox is
compiled with the AAPCS ABI which requires this.

It also had a bug and didn't pass the arguments properly, but code
execute via "go" rarely uses arguments so this wasn't very noticeable.

Since thumb2 was always the only user of do_execute(), go ahead and
delete that too.

Signed-off-by: Trent Piepho <tpiepho@kymetacorp.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: l2x0: move outer cache flush on disable to user ...

There are systems like the Calxeda Highbank, which need to do SMC
calls in order to access the secure L2C registers, which means they
want to replace the outer cache disable function with their own.

As the cache flush before entering the boot target is still needed
and to avoid exposing L2C internals to the architectures move the
flush before disable into the only current user.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: l2x0: Flush cache before disabling it ...

Otherwise entries may still be in the cache and never reach memory.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

exitcall: move arch_shutdown to exitcall infrastructure ...

Signed-off-by: Herve Codina <Herve.CODINA@celad.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

misc: upper-case some abbreviations ...

Signed-off-by: Holger Schurig <holgerschurig@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: mode cpu_architecture() to common.c ...

It might be needed in pbl code, so move it to a file which is
compiled in pbl mode.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: make cpu architecture detection available as static inline function ...

When we have multi cpu support compiled in we need the cpu architecture
early so that we can pick the correct cacheflush function. Make it available
as static inline function and add a comment above it that this function
normally should not be used.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

arm: move outercase to cpu.c as some SoC as the ux500 always need to flush the l2x0 ...

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: Setup stack at end of SDRAM ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: ensure irqs are disabled at barebox exit ...

Signed-off-by: Vicente Bergas <vicencb@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: no need to call cache functions when MMU is disabled ...

Without MMU enabled we do not need to call __mmu_cache_* as the
caches are not enabled. Calling flush_icache() before jumping
to new code is enough.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: Add cpu_architecture() function ...

Once we run on multiple SoCs we must know which arm architecture we
are on. Add cpu_architecture() from the kernel to detect it.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Treewide: remove address of the Free Software Foundation ...

The FSF address has changed in the past. Instead of updating it
each time the address changes, just drop it completely treewide.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: Allow to compile in thumb-2 mode ...

This shrinks the resulting binary size by ~25%. Exceptions
are still handled in arm mode, so we have to explicitely
put .arm directives into the exception code. Thumb-2 mode
has been tested on i.MX51 Babbage board.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Merge branch 'next'

ARM: mark 'lr' as clobbered by inline assembler ...

When executing 'bl' in inline assembler, the 'lr' register must be
marked as clobbered too.

Signed-off-by: Enrico Scholz <enrico.scholz@sigma-chemnitz.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: remove unused icache command ...

The icache command is unused. Instead of adding it to compilation
again, remove it as the cpuinfo command provides the same information.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: switch to generic memory banks ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: move armlinux_add_dram to location which is always compiled ...

We want to use the memory banks later in the MMU which is
independent of Linux, so move this to a location which is
always compiled.

Also, make the memory bank list global and add an iterator
for it.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

arm: compile icache command only when command support is present ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

arch/arm/cpu/cpu.c: sparse fixes ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

arch/arm/cpu/cpu.c: remove unused variable ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

arm: use processor specififc functions to turn off MMU ...

The way it was done before does not work on Cortex processors.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Tested-by: Orjan Friberg <of@flatfrog.com>
Tested-by: Luca Ceresoli <list@lucaceresoli.net>

ARM: update icache functions to use get_cr/set_cr ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>