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qemu/hw/rtc/ls7a_rtc.c
Xiaojuan Yang c117f68a46 hw/loongarch: Add LoongArch ls7a rtc device support 
This patch add ls7a rtc device support.

Signed-off-by: Xiaojuan Yang <yangxiaojuan@loongson.cn>
Signed-off-by: Song Gao <gaosong@loongson.cn>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220606124333.2060567-39-yangxiaojuan@loongson.cn>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2022-06-06 18:14:13 +00:00

529 lines
14 KiB
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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Loongarch LS7A Real Time Clock emulation
*
* Copyright (C) 2021 Loongson Technology Corporation Limited
*/
#include "qemu/osdep.h"
#include "hw/sysbus.h"
#include "hw/irq.h"
#include "include/hw/register.h"
#include "qemu/timer.h"
#include "sysemu/sysemu.h"
#include "qemu/cutils.h"
#include "qemu/log.h"
#include "migration/vmstate.h"
#include "hw/misc/unimp.h"
#include "sysemu/rtc.h"
#include "hw/registerfields.h"
#define SYS_TOYTRIM 0x20
#define SYS_TOYWRITE0 0x24
#define SYS_TOYWRITE1 0x28
#define SYS_TOYREAD0 0x2C
#define SYS_TOYREAD1 0x30
#define SYS_TOYMATCH0 0x34
#define SYS_TOYMATCH1 0x38
#define SYS_TOYMATCH2 0x3C
#define SYS_RTCCTRL 0x40
#define SYS_RTCTRIM 0x60
#define SYS_RTCWRTIE0 0x64
#define SYS_RTCREAD0 0x68
#define SYS_RTCMATCH0 0x6C
#define SYS_RTCMATCH1 0x70
#define SYS_RTCMATCH2 0x74
#define LS7A_RTC_FREQ 32768
#define TIMER_NUMS 3
/*
* Shift bits and filed mask
*/
FIELD(TOY, MON, 26, 6)
FIELD(TOY, DAY, 21, 5)
FIELD(TOY, HOUR, 16, 5)
FIELD(TOY, MIN, 10, 6)
FIELD(TOY, SEC, 4, 6)
FIELD(TOY, MSEC, 0, 4)
FIELD(TOY_MATCH, YEAR, 26, 6)
FIELD(TOY_MATCH, MON, 22, 4)
FIELD(TOY_MATCH, DAY, 17, 5)
FIELD(TOY_MATCH, HOUR, 12, 5)
FIELD(TOY_MATCH, MIN, 6, 6)
FIELD(TOY_MATCH, SEC, 0, 6)
FIELD(RTC_CTRL, RTCEN, 13, 1)
FIELD(RTC_CTRL, TOYEN, 11, 1)
FIELD(RTC_CTRL, EO, 8, 1)
#define TYPE_LS7A_RTC "ls7a_rtc"
OBJECT_DECLARE_SIMPLE_TYPE(LS7ARtcState, LS7A_RTC)
struct LS7ARtcState {
SysBusDevice parent_obj;
MemoryRegion iomem;
/*
* Needed to preserve the tick_count across migration, even if the
* absolute value of the rtc_clock is different on the source and
* destination.
*/
int64_t offset_toy;
int64_t offset_rtc;
uint64_t save_toy_mon;
uint64_t save_toy_year;
uint64_t save_rtc;
int64_t data;
int tidx;
uint32_t toymatch[3];
uint32_t toytrim;
uint32_t cntrctl;
uint32_t rtctrim;
uint32_t rtccount;
uint32_t rtcmatch[3];
QEMUTimer *toy_timer[TIMER_NUMS];
QEMUTimer *rtc_timer[TIMER_NUMS];
qemu_irq irq;
};
/* switch nanoseconds time to rtc ticks */
static inline uint64_t ls7a_rtc_ticks(void)
{
return qemu_clock_get_ns(rtc_clock) * LS7A_RTC_FREQ / NANOSECONDS_PER_SECOND;
}
/* switch rtc ticks to nanoseconds */
static inline uint64_t ticks_to_ns(uint64_t ticks)
{
return ticks * NANOSECONDS_PER_SECOND / LS7A_RTC_FREQ;
}
static inline bool toy_enabled(LS7ARtcState *s)
{
return FIELD_EX32(s->cntrctl, RTC_CTRL, TOYEN) &&
FIELD_EX32(s->cntrctl, RTC_CTRL, EO);
}
static inline bool rtc_enabled(LS7ARtcState *s)
{
return FIELD_EX32(s->cntrctl, RTC_CTRL, RTCEN) &&
FIELD_EX32(s->cntrctl, RTC_CTRL, EO);
}
/* parse toy value to struct tm */
static inline void toy_val_to_time_mon(uint64_t toy_val, struct tm *tm)
{
tm->tm_sec = FIELD_EX32(toy_val, TOY, SEC);
tm->tm_min = FIELD_EX32(toy_val, TOY, MIN);
tm->tm_hour = FIELD_EX32(toy_val, TOY, HOUR);
tm->tm_mday = FIELD_EX32(toy_val, TOY, DAY);
tm->tm_mon = FIELD_EX32(toy_val, TOY, MON) - 1;
}
static inline void toy_val_to_time_year(uint64_t toy_year, struct tm *tm)
{
tm->tm_year = toy_year;
}
/* parse struct tm to toy value */
static inline uint64_t toy_time_to_val_mon(struct tm tm)
{
uint64_t val = 0;
val = FIELD_DP32(val, TOY, MON, tm.tm_mon + 1);
val = FIELD_DP32(val, TOY, DAY, tm.tm_mday);
val = FIELD_DP32(val, TOY, HOUR, tm.tm_hour);
val = FIELD_DP32(val, TOY, MIN, tm.tm_min);
val = FIELD_DP32(val, TOY, SEC, tm.tm_sec);
return val;
}
static inline uint64_t toy_time_to_val_year(struct tm tm)
{
uint64_t year;
year = tm.tm_year;
return year;
}
static inline void toymatch_val_to_time(uint64_t val, struct tm *tm)
{
tm->tm_sec = FIELD_EX32(val, TOY_MATCH, SEC);
tm->tm_min = FIELD_EX32(val, TOY_MATCH, MIN);
tm->tm_hour = FIELD_EX32(val, TOY_MATCH, HOUR);
tm->tm_mday = FIELD_EX32(val, TOY_MATCH, DAY);
tm->tm_mon = FIELD_EX32(val, TOY_MATCH, MON) - 1;
tm->tm_year += (FIELD_EX32(val, TOY_MATCH, YEAR) - (tm->tm_year & 0x3f));
}
static void toymatch_write(LS7ARtcState *s, struct tm *tm, uint64_t val, int num)
{
int64_t now, expire_time;
/* it do not support write when toy disabled */
if (toy_enabled(s)) {
s->toymatch[num] = val;
/* caculate expire time */
now = qemu_clock_get_ms(rtc_clock);
toymatch_val_to_time(val, tm);
expire_time = now + (qemu_timedate_diff(tm) - s->offset_toy) * 1000;
timer_mod(s->toy_timer[num], expire_time);
}
}
static void rtcmatch_write(LS7ARtcState *s, uint64_t val, int num)
{
uint64_t expire_ns;
/* it do not support write when toy disabled */
if (rtc_enabled(s)) {
s->rtcmatch[num] = val;
/* caculate expire time */
expire_ns = ticks_to_ns(val) - ticks_to_ns(s->offset_rtc);
timer_mod_ns(s->rtc_timer[num], expire_ns);
}
}
static void ls7a_toy_stop(LS7ARtcState *s)
{
int i;
struct tm tm;
/*
* save time when disabled toy,
* because toy time not add counters.
*/
qemu_get_timedate(&tm, s->offset_toy);
s->save_toy_mon = toy_time_to_val_mon(tm);
s->save_toy_year = toy_time_to_val_year(tm);
/* delete timers, and when re-enabled, recaculate expire time */
for (i = 0; i < TIMER_NUMS; i++) {
timer_del(s->toy_timer[i]);
}
}
static void ls7a_rtc_stop(LS7ARtcState *s)
{
int i;
uint64_t time;
/* save rtc time */
time = ls7a_rtc_ticks() + s->offset_rtc;
s->save_rtc = time;
/* delete timers, and when re-enabled, recaculate expire time */
for (i = 0; i < TIMER_NUMS; i++) {
timer_del(s->rtc_timer[i]);
}
}
static void ls7a_toy_start(LS7ARtcState *s)
{
int i;
uint64_t expire_time, now;
struct tm tm;
/*
* need to recaculate toy offset
* and expire time when enable it.
*/
toy_val_to_time_mon(s->save_toy_mon, &tm);
toy_val_to_time_year(s->save_toy_year, &tm);
s->offset_toy = qemu_timedate_diff(&tm);
now = qemu_clock_get_ms(rtc_clock);
/* recaculate expire time and enable timer */
for (i = 0; i < TIMER_NUMS; i++) {
toymatch_val_to_time(s->toymatch[i], &tm);
expire_time = now + (qemu_timedate_diff(&tm) - s->offset_toy) * 1000;
timer_mod(s->toy_timer[i], expire_time);
}
}
static void ls7a_rtc_start(LS7ARtcState *s)
{
int i;
uint64_t expire_time, now;
/*
* need to recaculate rtc offset
* and expire time when enable it.
*/
now = ls7a_rtc_ticks();
s->offset_rtc = s->save_rtc - now;
/* recaculate expire time and enable timer */
for (i = 0; i < TIMER_NUMS; i++) {
expire_time = ticks_to_ns(s->rtcmatch[i]) - ticks_to_ns(s->offset_rtc);
timer_mod_ns(s->rtc_timer[i], expire_time);
}
}
static uint64_t ls7a_rtc_read(void *opaque, hwaddr addr, unsigned size)
{
LS7ARtcState *s = LS7A_RTC(opaque);
struct tm tm;
int val = 0;
switch (addr) {
case SYS_TOYREAD0:
/* if toy disabled, read save toy time */
if (toy_enabled(s)) {
qemu_get_timedate(&tm, s->offset_toy);
val = toy_time_to_val_mon(tm);
} else {
/* read save mon val */
val = s->save_toy_mon;
}
break;
case SYS_TOYREAD1:
/* if toy disabled, read save toy time */
if (toy_enabled(s)) {
qemu_get_timedate(&tm, s->offset_toy);
val = tm.tm_year;
} else {
/* read save year val */
val = s->save_toy_year;
}
break;
case SYS_TOYMATCH0:
val = s->toymatch[0];
break;
case SYS_TOYMATCH1:
val = s->toymatch[1];
break;
case SYS_TOYMATCH2:
val = s->toymatch[2];
break;
case SYS_RTCCTRL:
val = s->cntrctl;
break;
case SYS_RTCREAD0:
/* if rtc disabled, read save rtc time */
if (rtc_enabled(s)) {
val = ls7a_rtc_ticks() + s->offset_rtc;
} else {
val = s->save_rtc;
}
break;
case SYS_RTCMATCH0:
val = s->rtcmatch[0];
break;
case SYS_RTCMATCH1:
val = s->rtcmatch[1];
break;
case SYS_RTCMATCH2:
val = s->rtcmatch[2];
break;
default:
val = 0;
break;
}
return val;
}
static void ls7a_rtc_write(void *opaque, hwaddr addr,
uint64_t val, unsigned size)
{
int old_toyen, old_rtcen, new_toyen, new_rtcen;
LS7ARtcState *s = LS7A_RTC(opaque);
struct tm tm;
switch (addr) {
case SYS_TOYWRITE0:
/* it do not support write when toy disabled */
if (toy_enabled(s)) {
qemu_get_timedate(&tm, s->offset_toy);
tm.tm_sec = FIELD_EX32(val, TOY, SEC);
tm.tm_min = FIELD_EX32(val, TOY, MIN);
tm.tm_hour = FIELD_EX32(val, TOY, HOUR);
tm.tm_mday = FIELD_EX32(val, TOY, DAY);
tm.tm_mon = FIELD_EX32(val, TOY, MON) - 1;
s->offset_toy = qemu_timedate_diff(&tm);
}
break;
case SYS_TOYWRITE1:
if (toy_enabled(s)) {
qemu_get_timedate(&tm, s->offset_toy);
tm.tm_year = val;
s->offset_toy = qemu_timedate_diff(&tm);
}
break;
case SYS_TOYMATCH0:
toymatch_write(s, &tm, val, 0);
break;
case SYS_TOYMATCH1:
toymatch_write(s, &tm, val, 1);
break;
case SYS_TOYMATCH2:
toymatch_write(s, &tm, val, 2);
break;
case SYS_RTCCTRL:
/* get old ctrl */
old_toyen = toy_enabled(s);
old_rtcen = rtc_enabled(s);
s->cntrctl = val;
/* get new ctrl */
new_toyen = toy_enabled(s);
new_rtcen = rtc_enabled(s);
/*
* we do not consider if EO changed, as it always set at most time.
* toy or rtc enabled should start timer. otherwise, stop timer
*/
if (old_toyen != new_toyen) {
if (new_toyen) {
ls7a_toy_start(s);
} else {
ls7a_toy_stop(s);
}
}
if (old_rtcen != new_rtcen) {
if (new_rtcen) {
ls7a_rtc_start(s);
} else {
ls7a_rtc_stop(s);
}
}
break;
case SYS_RTCWRTIE0:
if (rtc_enabled(s)) {
s->offset_rtc = val - ls7a_rtc_ticks();
}
break;
case SYS_RTCMATCH0:
rtcmatch_write(s, val, 0);
break;
case SYS_RTCMATCH1:
rtcmatch_write(s, val, 1);
break;
case SYS_RTCMATCH2:
rtcmatch_write(s, val, 2);
break;
default:
break;
}
}
static const MemoryRegionOps ls7a_rtc_ops = {
.read = ls7a_rtc_read,
.write = ls7a_rtc_write,
.endianness = DEVICE_LITTLE_ENDIAN,
.valid = {
.min_access_size = 4,
.max_access_size = 4,
},
};
static void toy_timer_cb(void *opaque)
{
LS7ARtcState *s = opaque;
if (toy_enabled(s)) {
qemu_irq_pulse(s->irq);
}
}
static void rtc_timer_cb(void *opaque)
{
LS7ARtcState *s = opaque;
if (rtc_enabled(s)) {
qemu_irq_pulse(s->irq);
}
}
static void ls7a_rtc_realize(DeviceState *dev, Error **errp)
{
int i;
SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
LS7ARtcState *d = LS7A_RTC(sbd);
memory_region_init_io(&d->iomem, NULL, &ls7a_rtc_ops,
(void *)d, "ls7a_rtc", 0x100);
sysbus_init_irq(sbd, &d->irq);
sysbus_init_mmio(sbd, &d->iomem);
for (i = 0; i < TIMER_NUMS; i++) {
d->toymatch[i] = 0;
d->rtcmatch[i] = 0;
d->toy_timer[i] = timer_new_ms(rtc_clock, toy_timer_cb, d);
d->rtc_timer[i] = timer_new_ms(rtc_clock, rtc_timer_cb, d);
}
d->offset_toy = 0;
d->offset_rtc = 0;
d->save_toy_mon = 0;
d->save_toy_year = 0;
d->save_rtc = 0;
create_unimplemented_device("mmio fallback 1", 0x10013ffc, 0x4);
}
static int ls7a_rtc_pre_save(void *opaque)
{
LS7ARtcState *s = LS7A_RTC(opaque);
ls7a_toy_stop(s);
ls7a_rtc_stop(s);
return 0;
}
static int ls7a_rtc_post_load(void *opaque, int version_id)
{
LS7ARtcState *s = LS7A_RTC(opaque);
if (toy_enabled(s)) {
ls7a_toy_start(s);
}
if (rtc_enabled(s)) {
ls7a_rtc_start(s);
}
return 0;
}
static const VMStateDescription vmstate_ls7a_rtc = {
.name = "ls7a_rtc",
.version_id = 1,
.minimum_version_id = 1,
.pre_save = ls7a_rtc_pre_save,
.post_load = ls7a_rtc_post_load,
.fields = (VMStateField[]) {
VMSTATE_INT64(offset_toy, LS7ARtcState),
VMSTATE_INT64(offset_rtc, LS7ARtcState),
VMSTATE_UINT64(save_toy_mon, LS7ARtcState),
VMSTATE_UINT64(save_toy_year, LS7ARtcState),
VMSTATE_UINT64(save_rtc, LS7ARtcState),
VMSTATE_UINT32_ARRAY(toymatch, LS7ARtcState, TIMER_NUMS),
VMSTATE_UINT32_ARRAY(rtcmatch, LS7ARtcState, TIMER_NUMS),
VMSTATE_UINT32(cntrctl, LS7ARtcState),
VMSTATE_END_OF_LIST()
}
};
static void ls7a_rtc_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->vmsd = &vmstate_ls7a_rtc;
dc->realize = ls7a_rtc_realize;
dc->desc = "ls7a rtc";
}
static const TypeInfo ls7a_rtc_info = {
.name = TYPE_LS7A_RTC,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(LS7ARtcState),
.class_init = ls7a_rtc_class_init,
};
static void ls7a_rtc_register_types(void)
{
type_register_static(&ls7a_rtc_info);
}
type_init(ls7a_rtc_register_types)
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