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/*
* ARM IoTKit system information block
*
* Copyright (c) 2018 Linaro Limited
* Written by Peter Maydell
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 or
* (at your option) any later version.
*/
/*
* This is a model of the "system information block" which is part of the
* Arm IoTKit and documented in
* http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ecm0601256/index.html
* It consists of 2 read-only version/config registers, plus the
* usual ID registers.
*/
#include "qemu/osdep.h"
#include "qemu/log.h"
#include "trace.h"
#include "qapi/error.h"
#include "sysemu/sysemu.h"
#include "hw/sysbus.h"
#include "hw/registerfields.h"
#include "hw/misc/iotkit-sysinfo.h"
REG32(SYS_VERSION, 0x0)
REG32(SYS_CONFIG, 0x4)
REG32(PID4, 0xfd0)
REG32(PID5, 0xfd4)
REG32(PID6, 0xfd8)
REG32(PID7, 0xfdc)
REG32(PID0, 0xfe0)
REG32(PID1, 0xfe4)
REG32(PID2, 0xfe8)
REG32(PID3, 0xfec)
REG32(CID0, 0xff0)
REG32(CID1, 0xff4)
REG32(CID2, 0xff8)
REG32(CID3, 0xffc)
/* PID/CID values */
static const int sysinfo_id[] = {
0x04, 0x00, 0x00, 0x00, /* PID4..PID7 */
0x58, 0xb8, 0x0b, 0x00, /* PID0..PID3 */
0x0d, 0xf0, 0x05, 0xb1, /* CID0..CID3 */
};
static uint64_t iotkit_sysinfo_read(void *opaque, hwaddr offset,
unsigned size)
{
uint64_t r;
switch (offset) {
case A_SYS_VERSION:
r = 0x41743;
break;
case A_SYS_CONFIG:
r = 0x31;
break;
case A_PID4 ... A_CID3:
r = sysinfo_id[(offset - A_PID4) / 4];
break;
default:
qemu_log_mask(LOG_GUEST_ERROR,
"IoTKit SysInfo read: bad offset %x\n", (int)offset);
r = 0;
break;
}
trace_iotkit_sysinfo_read(offset, r, size);
return r;
}
static void iotkit_sysinfo_write(void *opaque, hwaddr offset,
uint64_t value, unsigned size)
{
trace_iotkit_sysinfo_write(offset, value, size);
qemu_log_mask(LOG_GUEST_ERROR,
"IoTKit SysInfo: write to RO offset 0x%x\n", (int)offset);
}
static const MemoryRegionOps iotkit_sysinfo_ops = {
.read = iotkit_sysinfo_read,
.write = iotkit_sysinfo_write,
.endianness = DEVICE_LITTLE_ENDIAN,
/* byte/halfword accesses are just zero-padded on reads and writes */
.impl.min_access_size = 4,
.impl.max_access_size = 4,
.valid.min_access_size = 1,
.valid.max_access_size = 4,
};
static void iotkit_sysinfo_init(Object *obj)
{
SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
IoTKitSysInfo *s = IOTKIT_SYSINFO(obj);
memory_region_init_io(&s->iomem, obj, &iotkit_sysinfo_ops,
s, "iotkit-sysinfo", 0x1000);
sysbus_init_mmio(sbd, &s->iomem);
}
static void iotkit_sysinfo_class_init(ObjectClass *klass, void *data)
{
/*
* This device has no guest-modifiable state and so it
* does not need a reset function or VMState.
*/
}
static const TypeInfo iotkit_sysinfo_info = {
.name = TYPE_IOTKIT_SYSINFO,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(IoTKitSysInfo),
.instance_init = iotkit_sysinfo_init,
.class_init = iotkit_sysinfo_class_init,
};
static void iotkit_sysinfo_register_types(void)
{
type_register_static(&iotkit_sysinfo_info);
}
type_init(iotkit_sysinfo_register_types);
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