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hw/arm/armsse: Introduce SSE subsystem version property

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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>
Tested-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20210219144617.4782-6-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2021-02-19 14:45:38 +00:00
parent c7db11b099
commit 419a7f8075
4 changed files with 58 additions and 10 deletions
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7
include/hw/misc/iotkit-sysctl.h
View file

@ -17,9 +17,8 @@
* "system control register" blocks.
*
* QEMU interface:
* + QOM property "SYS_VERSION": value of the SYS_VERSION register of the
* system information block of the SSE
* (used to identify whether to provide SSE-200-only registers)
* + QOM property "sse-version": indicates which SSE version this is part of
* (used to identify whether to provide SSE-200-only registers, etc)
* + sysbus MMIO region 0: the system information register bank
* + sysbus MMIO region 1: the system control register bank
*/
@ -61,7 +60,7 @@ struct IoTKitSysCtl {
uint32_t pdcm_pd_sram3_sense;
/* Properties */
uint32_t sys_version;
uint32_t sse_version;
uint32_t cpuwait_rst;
uint32_t initsvtor0_rst;
uint32_t initsvtor1_rst;