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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
43 lines
1.1 KiB
C
43 lines
1.1 KiB
C
/*
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* ARM SSE (Subsystems for Embedded): IoTKit, SSE-200
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*
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* Copyright (c) 2020 Linaro Limited
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* Written by Peter Maydell
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 or
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* (at your option) any later version.
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*/
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#ifndef ARMSSE_VERSION_H
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#define ARMSSE_VERSION_H
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/*
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* Define an enumeration of the possible values of the sse-version
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* property implemented by various sub-devices of the SSE, and
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* a validation function that checks that a valid value has been passed.
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* These are arbitrary QEMU-internal values (nobody should be creating
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* the sub-devices of the SSE except for the SSE object itself), but
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* we pick obvious numbers for the benefit of people debugging with gdb.
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*/
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enum {
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ARMSSE_IOTKIT = 0,
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ARMSSE_SSE200 = 200,
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ARMSSE_SSE300 = 300,
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};
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static inline bool armsse_version_valid(uint32_t sse_version)
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{
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switch (sse_version) {
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case ARMSSE_IOTKIT:
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case ARMSSE_SSE200:
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case ARMSSE_SSE300:
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return true;
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default:
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return false;
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}
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}
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#endif
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