AM64 ES2.0 bootrom seems to enable WAIT0EDGEDETECTION interrupt.
This causes a lockup at A53 SPL when accessing NAND controller
or ELM registers.
A good option would be to softrest GPMC block at probe
but this cannot be done for AM64 as SOFTRESET bit is marked
as reserved in SYSCONFIG register.
Fix the issue by disabling all IRQs at probe.
Signed-off-by: Roger Quadros <rogerq@kernel.org>
The GPMC is a unified memory controller dedicated for interfacing
with external memory devices like
- Asynchronous SRAM-like memories and ASICs
- Asynchronous, synchronous, and page mode burst NOR flash
- NAND flash
- Pseudo-SRAM devices
This driver will take care of setting up the GPMC based on
the settings specified in the Device tree and then
probe its children.
Signed-off-by: Roger Quadros <rogerq@kernel.org>
