path: root/hw/arm/armsse.c
diff options
authorPeter Maydell <peter.maydell@linaro.org>2020-11-30 17:07:34 +0000
committerPeter Maydell <peter.maydell@linaro.org>2021-02-15 13:16:13 +0000
commit60c860797d55cb3c90c4a77ba0610880e6404d0a (patch)
tree600eba6c8aa30579de848dafdd40096871a59c2b /hw/arm/armsse.c
parentcc14bfc00362220c14082bcc8759863778b4ef0c (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 'hw/arm/armsse.c')
1 files changed, 6 insertions, 2 deletions
diff --git a/hw/arm/armsse.c b/hw/arm/armsse.c
index fa155b7202..f509f59d4a 100644
--- a/hw/arm/armsse.c
+++ b/hw/arm/armsse.c
@@ -19,6 +19,7 @@
#include "migration/vmstate.h"
#include "hw/registerfields.h"
#include "hw/arm/armsse.h"
+#include "hw/arm/armsse-version.h"
#include "hw/arm/boot.h"
#include "hw/irq.h"
#include "hw/qdev-clock.h"
@@ -31,6 +32,7 @@ typedef enum SysConfigFormat {
struct ARMSSEInfo {
const char *name;
+ uint32_t sse_version;
int sram_banks;
int num_cpus;
uint32_t sys_version;
@@ -71,6 +73,7 @@ static Property armsse_properties[] = {
static const ARMSSEInfo armsse_variants[] = {
.name = TYPE_IOTKIT,
+ .sse_version = ARMSSE_IOTKIT,
.sram_banks = 1,
.num_cpus = 1,
.sys_version = 0x41743,
@@ -85,6 +88,7 @@ static const ARMSSEInfo armsse_variants[] = {
.name = TYPE_SSE200,
+ .sse_version = ARMSSE_SSE200,
.sram_banks = 4,
.num_cpus = 2,
.sys_version = 0x22041743,
@@ -951,8 +955,8 @@ static void armsse_realize(DeviceState *dev, Error **errp)
/* System information registers */
sysbus_mmio_map(SYS_BUS_DEVICE(&s->sysinfo), 0, 0x40020000);
/* System control registers */
- object_property_set_int(OBJECT(&s->sysctl), "SYS_VERSION",
- info->sys_version, &error_abort);
+ object_property_set_int(OBJECT(&s->sysctl), "sse-version",
+ info->sse_version, &error_abort);
object_property_set_int(OBJECT(&s->sysctl), "CPUWAIT_RST",
info->cpuwait_rst, &error_abort);
object_property_set_int(OBJECT(&s->sysctl), "INITSVTOR0_RST",