tree 8fb24cf090482fb9335109c7f67cb741cab312a1
parent 0d7301d11154d7ce8a1962ae141fce7010cee7bd
author Cindy Chen <chencindy@google.com> 1600375731 -0700
committer cindychip <cindy.chen0316@gmail.com> 1600886875 -0700

[fpv/csr_assert] add csr support for regwen

Issue #3035 recorded compile errors when some module enabled FPV csr
assert. The reason was because of the regwen registers. They could not
be accessed through `reg2hw` or `hw2reg`. To solve this issue, this PR
stored the regwen values locally.
This PR also cleans up a few redundant code.
fpv CSR assert also does not support backdoor write, so the csr assert
will be disabled if backdoor write is enabled.

Right now the only compile error remaining are:
1. alert_handler: the enable register "classa_clren" can be written by
hw. Will need more support on FPV csr assert
2. flash_ctrl: the enable registers in flash_ctrl are not all W0C, reg
`ctrl_regwen` is RO. Will need more support on FPV csr assert

Signed-off-by: Cindy Chen <chencindy@google.com>