There are implementations of PL011 that can only handle 32-bit accesses
as oppose to the normal behavior where accesses are 8/16-bit wide. This
is usually advertised by setting a dt property 'reg-io-width' to 4.
Introduce CONFIG_EARLY_UART_PL011_MMIO32 Kconfig option to be able to
enable the use of 32-bit only accessors in PL011 early printk code.
Define macros PL011_{STRH,STRB,LDRH} to distinguish accessors for normal
case from 32-bit MMIO one and use them in arm32/arm64 pl011 early printk
code.
Update documentation accordingly.
Signed-off-by: Michal Orzel <michal.orzel@amd.com>
Tested-by: Henry Wang <Henry.Wang@arm.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
Michal Orzel
4fa2272458