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/*
* Allwinner H3 System Control emulation
*
* Copyright (C) 2019 Niek Linnenbank <nieklinnenbank@gmail.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "qemu/units.h"
#include "hw/sysbus.h"
#include "migration/vmstate.h"
#include "qemu/log.h"
#include "qemu/module.h"
#include "hw/misc/allwinner-h3-sysctrl.h"
/* System Control register offsets */
enum {
REG_VER = 0x24, /* Version */
REG_EMAC_PHY_CLK = 0x30, /* EMAC PHY Clock */
};
#define REG_INDEX(offset) (offset / sizeof(uint32_t))
/* System Control register reset values */
enum {
REG_VER_RST = 0x0,
REG_EMAC_PHY_CLK_RST = 0x58000,
};
static uint64_t allwinner_h3_sysctrl_read(void *opaque, hwaddr offset,
unsigned size)
{
const AwH3SysCtrlState *s = AW_H3_SYSCTRL(opaque);
const uint32_t idx = REG_INDEX(offset);
if (idx >= AW_H3_SYSCTRL_REGS_NUM) {
qemu_log_mask(LOG_GUEST_ERROR, "%s: out-of-bounds offset 0x%04x\n",
__func__, (uint32_t)offset);
return 0;
}
return s->regs[idx];
}
static void allwinner_h3_sysctrl_write(void *opaque, hwaddr offset,
uint64_t val, unsigned size)
{
AwH3SysCtrlState *s = AW_H3_SYSCTRL(opaque);
const uint32_t idx = REG_INDEX(offset);
if (idx >= AW_H3_SYSCTRL_REGS_NUM) {
qemu_log_mask(LOG_GUEST_ERROR, "%s: out-of-bounds offset 0x%04x\n",
__func__, (uint32_t)offset);
return;
}
switch (offset) {
case REG_VER: /* Version */
break;
default:
s->regs[idx] = (uint32_t) val;
break;
}
}
static const MemoryRegionOps allwinner_h3_sysctrl_ops = {
.read = allwinner_h3_sysctrl_read,
.write = allwinner_h3_sysctrl_write,
.endianness = DEVICE_LITTLE_ENDIAN,
.valid = {
.min_access_size = 4,
.max_access_size = 4,
},
.impl.min_access_size = 4,
};
static void allwinner_h3_sysctrl_reset(DeviceState *dev)
{
AwH3SysCtrlState *s = AW_H3_SYSCTRL(dev);
/* Set default values for registers */
s->regs[REG_INDEX(REG_VER)] = REG_VER_RST;
s->regs[REG_INDEX(REG_EMAC_PHY_CLK)] = REG_EMAC_PHY_CLK_RST;
}
static void allwinner_h3_sysctrl_init(Object *obj)
{
SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
AwH3SysCtrlState *s = AW_H3_SYSCTRL(obj);
/* Memory mapping */
memory_region_init_io(&s->iomem, OBJECT(s), &allwinner_h3_sysctrl_ops, s,
TYPE_AW_H3_SYSCTRL, 4 * KiB);
sysbus_init_mmio(sbd, &s->iomem);
}
static const VMStateDescription allwinner_h3_sysctrl_vmstate = {
.name = "allwinner-h3-sysctrl",
.version_id = 1,
.minimum_version_id = 1,
.fields = (const VMStateField[]) {
VMSTATE_UINT32_ARRAY(regs, AwH3SysCtrlState, AW_H3_SYSCTRL_REGS_NUM),
VMSTATE_END_OF_LIST()
}
};
static void allwinner_h3_sysctrl_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
device_class_set_legacy_reset(dc, allwinner_h3_sysctrl_reset);
dc->vmsd = &allwinner_h3_sysctrl_vmstate;
}
static const TypeInfo allwinner_h3_sysctrl_info = {
.name = TYPE_AW_H3_SYSCTRL,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_init = allwinner_h3_sysctrl_init,
.instance_size = sizeof(AwH3SysCtrlState),
.class_init = allwinner_h3_sysctrl_class_init,
};
static void allwinner_h3_sysctrl_register(void)
{
type_register_static(&allwinner_h3_sysctrl_info);
}
type_init(allwinner_h3_sysctrl_register)
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