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xemu/hw/rtc/allwinner-rtc.c
Niek Linnenbank a9ad9e73a7 hw/arm/allwinner: add RTC device support 
Allwinner System-on-Chips usually contain a Real Time Clock (RTC)
for non-volatile system date and time keeping. This commit adds a generic
Allwinner RTC device that supports the RTC devices found in Allwinner SoC
family sun4i (A10), sun7i (A20) and sun6i and newer (A31, H2+, H3, etc).
The following RTC functionality and features are implemented:

 * Year-Month-Day read/write
 * Hour-Minute-Second read/write
 * General Purpose storage

The following boards are extended with the RTC device:

 * Cubieboard (hw/arm/cubieboard.c)
 * Orange Pi PC (hw/arm/orangepi.c)

Signed-off-by: Niek Linnenbank <nieklinnenbank@gmail.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Message-id: 20200311221854.30370-13-nieklinnenbank@gmail.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2020-03-12 16:27:33 +00:00

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/*
* Allwinner Real Time Clock 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 "qemu-common.h"
#include "hw/qdev-properties.h"
#include "hw/rtc/allwinner-rtc.h"
#include "trace.h"
/* RTC registers */
enum {
REG_LOSC = 1, /* Low Oscillator Control */
REG_YYMMDD, /* RTC Year-Month-Day */
REG_HHMMSS, /* RTC Hour-Minute-Second */
REG_ALARM1_WKHHMMSS, /* Alarm1 Week Hour-Minute-Second */
REG_ALARM1_EN, /* Alarm1 Enable */
REG_ALARM1_IRQ_EN, /* Alarm1 IRQ Enable */
REG_ALARM1_IRQ_STA, /* Alarm1 IRQ Status */
REG_GP0, /* General Purpose Register 0 */
REG_GP1, /* General Purpose Register 1 */
REG_GP2, /* General Purpose Register 2 */
REG_GP3, /* General Purpose Register 3 */
/* sun4i registers */
REG_ALARM1_DDHHMMSS, /* Alarm1 Day Hour-Minute-Second */
REG_CPUCFG, /* CPU Configuration Register */
/* sun6i registers */
REG_LOSC_AUTOSTA, /* LOSC Auto Switch Status */
REG_INT_OSC_PRE, /* Internal OSC Clock Prescaler */
REG_ALARM0_COUNTER, /* Alarm0 Counter */
REG_ALARM0_CUR_VLU, /* Alarm0 Counter Current Value */
REG_ALARM0_ENABLE, /* Alarm0 Enable */
REG_ALARM0_IRQ_EN, /* Alarm0 IRQ Enable */
REG_ALARM0_IRQ_STA, /* Alarm0 IRQ Status */
REG_ALARM_CONFIG, /* Alarm Config */
REG_LOSC_OUT_GATING, /* LOSC Output Gating Register */
REG_GP4, /* General Purpose Register 4 */
REG_GP5, /* General Purpose Register 5 */
REG_GP6, /* General Purpose Register 6 */
REG_GP7, /* General Purpose Register 7 */
REG_RTC_DBG, /* RTC Debug Register */
REG_GPL_HOLD_OUT, /* GPL Hold Output Register */
REG_VDD_RTC, /* VDD RTC Regulate Register */
REG_IC_CHARA, /* IC Characteristics Register */
};
/* RTC register flags */
enum {
REG_LOSC_YMD = (1 << 7),
REG_LOSC_HMS = (1 << 8),
};
/* RTC sun4i register map (offset to name) */
const uint8_t allwinner_rtc_sun4i_regmap[] = {
[0x0000] = REG_LOSC,
[0x0004] = REG_YYMMDD,
[0x0008] = REG_HHMMSS,
[0x000C] = REG_ALARM1_DDHHMMSS,
[0x0010] = REG_ALARM1_WKHHMMSS,
[0x0014] = REG_ALARM1_EN,
[0x0018] = REG_ALARM1_IRQ_EN,
[0x001C] = REG_ALARM1_IRQ_STA,
[0x0020] = REG_GP0,
[0x0024] = REG_GP1,
[0x0028] = REG_GP2,
[0x002C] = REG_GP3,
[0x003C] = REG_CPUCFG,
};
/* RTC sun6i register map (offset to name) */
const uint8_t allwinner_rtc_sun6i_regmap[] = {
[0x0000] = REG_LOSC,
[0x0004] = REG_LOSC_AUTOSTA,
[0x0008] = REG_INT_OSC_PRE,
[0x0010] = REG_YYMMDD,
[0x0014] = REG_HHMMSS,
[0x0020] = REG_ALARM0_COUNTER,
[0x0024] = REG_ALARM0_CUR_VLU,
[0x0028] = REG_ALARM0_ENABLE,
[0x002C] = REG_ALARM0_IRQ_EN,
[0x0030] = REG_ALARM0_IRQ_STA,
[0x0040] = REG_ALARM1_WKHHMMSS,
[0x0044] = REG_ALARM1_EN,
[0x0048] = REG_ALARM1_IRQ_EN,
[0x004C] = REG_ALARM1_IRQ_STA,
[0x0050] = REG_ALARM_CONFIG,
[0x0060] = REG_LOSC_OUT_GATING,
[0x0100] = REG_GP0,
[0x0104] = REG_GP1,
[0x0108] = REG_GP2,
[0x010C] = REG_GP3,
[0x0110] = REG_GP4,
[0x0114] = REG_GP5,
[0x0118] = REG_GP6,
[0x011C] = REG_GP7,
[0x0170] = REG_RTC_DBG,
[0x0180] = REG_GPL_HOLD_OUT,
[0x0190] = REG_VDD_RTC,
[0x01F0] = REG_IC_CHARA,
};
static bool allwinner_rtc_sun4i_read(AwRtcState *s, uint32_t offset)
{
/* no sun4i specific registers currently implemented */
return false;
}
static bool allwinner_rtc_sun4i_write(AwRtcState *s, uint32_t offset,
uint32_t data)
{
/* no sun4i specific registers currently implemented */
return false;
}
static bool allwinner_rtc_sun6i_read(AwRtcState *s, uint32_t offset)
{
const AwRtcClass *c = AW_RTC_GET_CLASS(s);
switch (c->regmap[offset]) {
case REG_GP4: /* General Purpose Register 4 */
case REG_GP5: /* General Purpose Register 5 */
case REG_GP6: /* General Purpose Register 6 */
case REG_GP7: /* General Purpose Register 7 */
return true;
default:
break;
}
return false;
}
static bool allwinner_rtc_sun6i_write(AwRtcState *s, uint32_t offset,
uint32_t data)
{
const AwRtcClass *c = AW_RTC_GET_CLASS(s);
switch (c->regmap[offset]) {
case REG_GP4: /* General Purpose Register 4 */
case REG_GP5: /* General Purpose Register 5 */
case REG_GP6: /* General Purpose Register 6 */
case REG_GP7: /* General Purpose Register 7 */
return true;
default:
break;
}
return false;
}
static uint64_t allwinner_rtc_read(void *opaque, hwaddr offset,
unsigned size)
{
AwRtcState *s = AW_RTC(opaque);
const AwRtcClass *c = AW_RTC_GET_CLASS(s);
uint64_t val = 0;
if (offset >= c->regmap_size) {
qemu_log_mask(LOG_GUEST_ERROR, "%s: out-of-bounds offset 0x%04x\n",
__func__, (uint32_t)offset);
return 0;
}
if (!c->regmap[offset]) {
qemu_log_mask(LOG_GUEST_ERROR, "%s: invalid register 0x%04x\n",
__func__, (uint32_t)offset);
return 0;
}
switch (c->regmap[offset]) {
case REG_LOSC: /* Low Oscillator Control */
val = s->regs[REG_LOSC];
s->regs[REG_LOSC] &= ~(REG_LOSC_YMD | REG_LOSC_HMS);
break;
case REG_YYMMDD: /* RTC Year-Month-Day */
case REG_HHMMSS: /* RTC Hour-Minute-Second */
case REG_GP0: /* General Purpose Register 0 */
case REG_GP1: /* General Purpose Register 1 */
case REG_GP2: /* General Purpose Register 2 */
case REG_GP3: /* General Purpose Register 3 */
val = s->regs[c->regmap[offset]];
break;
default:
if (!c->read(s, offset)) {
qemu_log_mask(LOG_UNIMP, "%s: unimplemented register 0x%04x\n",
__func__, (uint32_t)offset);
}
val = s->regs[c->regmap[offset]];
break;
}
trace_allwinner_rtc_read(offset, val);
return val;
}
static void allwinner_rtc_write(void *opaque, hwaddr offset,
uint64_t val, unsigned size)
{
AwRtcState *s = AW_RTC(opaque);
const AwRtcClass *c = AW_RTC_GET_CLASS(s);
if (offset >= c->regmap_size) {
qemu_log_mask(LOG_GUEST_ERROR, "%s: out-of-bounds offset 0x%04x\n",
__func__, (uint32_t)offset);
return;
}
if (!c->regmap[offset]) {
qemu_log_mask(LOG_GUEST_ERROR, "%s: invalid register 0x%04x\n",
__func__, (uint32_t)offset);
return;
}
trace_allwinner_rtc_write(offset, val);
switch (c->regmap[offset]) {
case REG_YYMMDD: /* RTC Year-Month-Day */
s->regs[REG_YYMMDD] = val;
s->regs[REG_LOSC] |= REG_LOSC_YMD;
break;
case REG_HHMMSS: /* RTC Hour-Minute-Second */
s->regs[REG_HHMMSS] = val;
s->regs[REG_LOSC] |= REG_LOSC_HMS;
break;
case REG_GP0: /* General Purpose Register 0 */
case REG_GP1: /* General Purpose Register 1 */
case REG_GP2: /* General Purpose Register 2 */
case REG_GP3: /* General Purpose Register 3 */
s->regs[c->regmap[offset]] = val;
break;
default:
if (!c->write(s, offset, val)) {
qemu_log_mask(LOG_UNIMP, "%s: unimplemented register 0x%04x\n",
__func__, (uint32_t)offset);
}
break;
}
}
static const MemoryRegionOps allwinner_rtc_ops = {
.read = allwinner_rtc_read,
.write = allwinner_rtc_write,
.endianness = DEVICE_NATIVE_ENDIAN,
.valid = {
.min_access_size = 4,
.max_access_size = 4,
},
.impl.min_access_size = 4,
};
static void allwinner_rtc_reset(DeviceState *dev)
{
AwRtcState *s = AW_RTC(dev);
struct tm now;
/* Clear registers */
memset(s->regs, 0, sizeof(s->regs));
/* Get current datetime */
qemu_get_timedate(&now, 0);
/* Set RTC with current datetime */
if (s->base_year > 1900) {
s->regs[REG_YYMMDD] = ((now.tm_year + 1900 - s->base_year) << 16) |
((now.tm_mon + 1) << 8) |
now.tm_mday;
s->regs[REG_HHMMSS] = (((now.tm_wday + 6) % 7) << 29) |
(now.tm_hour << 16) |
(now.tm_min << 8) |
now.tm_sec;
}
}
static void allwinner_rtc_init(Object *obj)
{
SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
AwRtcState *s = AW_RTC(obj);
/* Memory mapping */
memory_region_init_io(&s->iomem, OBJECT(s), &allwinner_rtc_ops, s,
TYPE_AW_RTC, 1 * KiB);
sysbus_init_mmio(sbd, &s->iomem);
}
static const VMStateDescription allwinner_rtc_vmstate = {
.name = "allwinner-rtc",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT32_ARRAY(regs, AwRtcState, AW_RTC_REGS_NUM),
VMSTATE_END_OF_LIST()
}
};
static Property allwinner_rtc_properties[] = {
DEFINE_PROP_INT32("base-year", AwRtcState, base_year, 0),
DEFINE_PROP_END_OF_LIST(),
};
static void allwinner_rtc_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->reset = allwinner_rtc_reset;
dc->vmsd = &allwinner_rtc_vmstate;
device_class_set_props(dc, allwinner_rtc_properties);
}
static void allwinner_rtc_sun4i_init(Object *obj)
{
AwRtcState *s = AW_RTC(obj);
s->base_year = 2010;
}
static void allwinner_rtc_sun4i_class_init(ObjectClass *klass, void *data)
{
AwRtcClass *arc = AW_RTC_CLASS(klass);
arc->regmap = allwinner_rtc_sun4i_regmap;
arc->regmap_size = sizeof(allwinner_rtc_sun4i_regmap);
arc->read = allwinner_rtc_sun4i_read;
arc->write = allwinner_rtc_sun4i_write;
}
static void allwinner_rtc_sun6i_init(Object *obj)
{
AwRtcState *s = AW_RTC(obj);
s->base_year = 1970;
}
static void allwinner_rtc_sun6i_class_init(ObjectClass *klass, void *data)
{
AwRtcClass *arc = AW_RTC_CLASS(klass);
arc->regmap = allwinner_rtc_sun6i_regmap;
arc->regmap_size = sizeof(allwinner_rtc_sun6i_regmap);
arc->read = allwinner_rtc_sun6i_read;
arc->write = allwinner_rtc_sun6i_write;
}
static void allwinner_rtc_sun7i_init(Object *obj)
{
AwRtcState *s = AW_RTC(obj);
s->base_year = 1970;
}
static void allwinner_rtc_sun7i_class_init(ObjectClass *klass, void *data)
{
AwRtcClass *arc = AW_RTC_CLASS(klass);
allwinner_rtc_sun4i_class_init(klass, arc);
}
static const TypeInfo allwinner_rtc_info = {
.name = TYPE_AW_RTC,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_init = allwinner_rtc_init,
.instance_size = sizeof(AwRtcState),
.class_init = allwinner_rtc_class_init,
.class_size = sizeof(AwRtcClass),
.abstract = true,
};
static const TypeInfo allwinner_rtc_sun4i_info = {
.name = TYPE_AW_RTC_SUN4I,
.parent = TYPE_AW_RTC,
.class_init = allwinner_rtc_sun4i_class_init,
.instance_init = allwinner_rtc_sun4i_init,
};
static const TypeInfo allwinner_rtc_sun6i_info = {
.name = TYPE_AW_RTC_SUN6I,
.parent = TYPE_AW_RTC,
.class_init = allwinner_rtc_sun6i_class_init,
.instance_init = allwinner_rtc_sun6i_init,
};
static const TypeInfo allwinner_rtc_sun7i_info = {
.name = TYPE_AW_RTC_SUN7I,
.parent = TYPE_AW_RTC,
.class_init = allwinner_rtc_sun7i_class_init,
.instance_init = allwinner_rtc_sun7i_init,
};
static void allwinner_rtc_register(void)
{
type_register_static(&allwinner_rtc_info);
type_register_static(&allwinner_rtc_sun4i_info);
type_register_static(&allwinner_rtc_sun6i_info);
type_register_static(&allwinner_rtc_sun7i_info);
}
type_init(allwinner_rtc_register)
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