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author | Peter Maydell <peter.maydell@linaro.org> | 2020-11-30 17:07:34 +0000 |
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committer | Peter Maydell <peter.maydell@linaro.org> | 2021-02-15 13:16:13 +0000 |
commit | 60c860797d55cb3c90c4a77ba0610880e6404d0a (patch) | |
tree | 600eba6c8aa30579de848dafdd40096871a59c2b /tcg | |
parent | cc14bfc00362220c14082bcc8759863778b4ef0c (diff) |
hw/arm/armsse: Introduce SSE subsystem version property
We model Arm "Subsystems for Embedded" SoC subsystems using generic
code which is split into various sub-devices which are configurable
by QOM properties to handle the behaviour differences between the SSE
subsystems we implement. Currently the only sub-device which needs
to change is the IOTKIT_SYSCTL device, and we do this with a mix of
properties that directly specify divergent behaviours (eg
CPUWAIT_RST) and passing it the SYS_VERSION register value as a way
for it to distinguish IoTKit from SSE-200.
The "pass SYS_VERSION" approach is already a bit hacky, since the
IOTKIT_SYSCTL device has to know that the different part of the
register value happens to be bits [31:28]. For SSE-300 this register
is renamed SOC_IDENTITY and has a different format entirely, all of
whose fields can be configured by the SoC integrator when they
integrate the SSE into their SoC, and so "pass SYS_VERSION" breaks
down completely.
Switch to using a simple integer property representing an
internal-to-QEMU enumeration of the SSE flavour. For the moment we
only need this in IOTKIT_SYSCTL, but as we add SSE-300 support a few
of the other devices will also need to know.
We define and permit a value for the SSE-300 so we can start using
it in subsequent commits which add SSE-300 support.
The now-redundant is_sse200 flag in IoTKitSysCtl will be removed
in the following commit.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
I didn't use a full-on qdev/QOM 'enum' property here because that
requires messing with the QAPI schema, which seems like overkill for
this entirely-internal-to-the-implementation bit of information
passing.
Diffstat (limited to 'tcg')
0 files changed, 0 insertions, 0 deletions