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xemu/hw/rtc/exynos4210_rtc.c
Peter Maydell 9598c1bb39 ptimer: Rename PTIMER_POLICY_DEFAULT to PTIMER_POLICY_LEGACY 
The traditional ptimer behaviour includes a collection of weird edge
case behaviours.  In 2016 we improved the ptimer implementation to
fix these and generally make the behaviour more flexible, with
ptimers opting in to the new behaviour by passing an appropriate set
of policy flags to ptimer_init().  For backwards-compatibility, we
defined PTIMER_POLICY_DEFAULT (which sets no flags) to give the old
weird behaviour.

This turns out to be a poor choice of name, because people writing
new devices which use ptimers are misled into thinking that the
default is probably a sensible choice of flags, when in fact it is
almost always not what you want.  Rename PTIMER_POLICY_DEFAULT to
PTIMER_POLICY_LEGACY and beef up the comment to more clearly say that
new devices should not be using it.

The code-change part of this commit was produced by
  sed -i -e 's/PTIMER_POLICY_DEFAULT/PTIMER_POLICY_LEGACY/g' $(git grep -l PTIMER_POLICY_DEFAULT)
with the exception of a test name string change in
tests/unit/ptimer-test.c which was added manually.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Francisco Iglesias <francisco.iglesias@amd.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220516103058.162280-1-peter.maydell@linaro.org
2022-05-19 16:19:03 +01:00

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/*
* Samsung exynos4210 Real Time Clock
*
* Copyright (c) 2012 Samsung Electronics Co., Ltd.
* Ogurtsov Oleg <o.ogurtsov@samsung.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/>.
*
*/
/* Description:
* Register RTCCON:
* CLKSEL Bit[1] not used
* CLKOUTEN Bit[9] not used
*/
#include "qemu/osdep.h"
#include "qemu/log.h"
#include "qemu/module.h"
#include "hw/sysbus.h"
#include "migration/vmstate.h"
#include "qemu/timer.h"
#include "qemu/bcd.h"
#include "hw/ptimer.h"
#include "hw/irq.h"
#include "hw/arm/exynos4210.h"
#include "qom/object.h"
#include "sysemu/rtc.h"
#define DEBUG_RTC 0
#if DEBUG_RTC
#define DPRINTF(fmt, ...) \
do { fprintf(stdout, "RTC: [%24s:%5d] " fmt, __func__, __LINE__, \
## __VA_ARGS__); } while (0)
#else
#define DPRINTF(fmt, ...) do {} while (0)
#endif
#define EXYNOS4210_RTC_REG_MEM_SIZE 0x0100
#define INTP 0x0030
#define RTCCON 0x0040
#define TICCNT 0x0044
#define RTCALM 0x0050
#define ALMSEC 0x0054
#define ALMMIN 0x0058
#define ALMHOUR 0x005C
#define ALMDAY 0x0060
#define ALMMON 0x0064
#define ALMYEAR 0x0068
#define BCDSEC 0x0070
#define BCDMIN 0x0074
#define BCDHOUR 0x0078
#define BCDDAY 0x007C
#define BCDDAYWEEK 0x0080
#define BCDMON 0x0084
#define BCDYEAR 0x0088
#define CURTICNT 0x0090
#define TICK_TIMER_ENABLE 0x0100
#define TICNT_THRESHOLD 2
#define RTC_ENABLE 0x0001
#define INTP_TICK_ENABLE 0x0001
#define INTP_ALM_ENABLE 0x0002
#define ALARM_INT_ENABLE 0x0040
#define RTC_BASE_FREQ 32768
#define TYPE_EXYNOS4210_RTC "exynos4210.rtc"
OBJECT_DECLARE_SIMPLE_TYPE(Exynos4210RTCState, EXYNOS4210_RTC)
struct Exynos4210RTCState {
SysBusDevice parent_obj;
MemoryRegion iomem;
/* registers */
uint32_t reg_intp;
uint32_t reg_rtccon;
uint32_t reg_ticcnt;
uint32_t reg_rtcalm;
uint32_t reg_almsec;
uint32_t reg_almmin;
uint32_t reg_almhour;
uint32_t reg_almday;
uint32_t reg_almmon;
uint32_t reg_almyear;
uint32_t reg_curticcnt;
ptimer_state *ptimer; /* tick timer */
ptimer_state *ptimer_1Hz; /* clock timer */
uint32_t freq;
qemu_irq tick_irq; /* Time Tick Generator irq */
qemu_irq alm_irq; /* alarm irq */
struct tm current_tm; /* current time */
};
#define TICCKSEL(value) ((value & (0x0F << 4)) >> 4)
/*** VMState ***/
static const VMStateDescription vmstate_exynos4210_rtc_state = {
.name = "exynos4210.rtc",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT32(reg_intp, Exynos4210RTCState),
VMSTATE_UINT32(reg_rtccon, Exynos4210RTCState),
VMSTATE_UINT32(reg_ticcnt, Exynos4210RTCState),
VMSTATE_UINT32(reg_rtcalm, Exynos4210RTCState),
VMSTATE_UINT32(reg_almsec, Exynos4210RTCState),
VMSTATE_UINT32(reg_almmin, Exynos4210RTCState),
VMSTATE_UINT32(reg_almhour, Exynos4210RTCState),
VMSTATE_UINT32(reg_almday, Exynos4210RTCState),
VMSTATE_UINT32(reg_almmon, Exynos4210RTCState),
VMSTATE_UINT32(reg_almyear, Exynos4210RTCState),
VMSTATE_UINT32(reg_curticcnt, Exynos4210RTCState),
VMSTATE_PTIMER(ptimer, Exynos4210RTCState),
VMSTATE_PTIMER(ptimer_1Hz, Exynos4210RTCState),
VMSTATE_UINT32(freq, Exynos4210RTCState),
VMSTATE_INT32(current_tm.tm_sec, Exynos4210RTCState),
VMSTATE_INT32(current_tm.tm_min, Exynos4210RTCState),
VMSTATE_INT32(current_tm.tm_hour, Exynos4210RTCState),
VMSTATE_INT32(current_tm.tm_wday, Exynos4210RTCState),
VMSTATE_INT32(current_tm.tm_mday, Exynos4210RTCState),
VMSTATE_INT32(current_tm.tm_mon, Exynos4210RTCState),
VMSTATE_INT32(current_tm.tm_year, Exynos4210RTCState),
VMSTATE_END_OF_LIST()
}
};
#define BCD3DIGITS(x) \
((uint32_t)to_bcd((uint8_t)(x % 100)) + \
((uint32_t)to_bcd((uint8_t)((x % 1000) / 100)) << 8))
static void check_alarm_raise(Exynos4210RTCState *s)
{
unsigned int alarm_raise = 0;
struct tm stm = s->current_tm;
if ((s->reg_rtcalm & 0x01) &&
(to_bcd((uint8_t)stm.tm_sec) == (uint8_t)s->reg_almsec)) {
alarm_raise = 1;
}
if ((s->reg_rtcalm & 0x02) &&
(to_bcd((uint8_t)stm.tm_min) == (uint8_t)s->reg_almmin)) {
alarm_raise = 1;
}
if ((s->reg_rtcalm & 0x04) &&
(to_bcd((uint8_t)stm.tm_hour) == (uint8_t)s->reg_almhour)) {
alarm_raise = 1;
}
if ((s->reg_rtcalm & 0x08) &&
(to_bcd((uint8_t)stm.tm_mday) == (uint8_t)s->reg_almday)) {
alarm_raise = 1;
}
if ((s->reg_rtcalm & 0x10) &&
(to_bcd((uint8_t)stm.tm_mon) == (uint8_t)s->reg_almmon)) {
alarm_raise = 1;
}
if ((s->reg_rtcalm & 0x20) &&
(BCD3DIGITS(stm.tm_year) == s->reg_almyear)) {
alarm_raise = 1;
}
if (alarm_raise) {
DPRINTF("ALARM IRQ\n");
/* set irq status */
s->reg_intp |= INTP_ALM_ENABLE;
qemu_irq_raise(s->alm_irq);
}
}
/*
* RTC update frequency
* Parameters:
* reg_value - current RTCCON register or his new value
* Must be called within a ptimer_transaction_begin/commit block for s->ptimer.
*/
static void exynos4210_rtc_update_freq(Exynos4210RTCState *s,
uint32_t reg_value)
{
uint32_t freq;
freq = s->freq;
/* set frequncy for time generator */
s->freq = RTC_BASE_FREQ / (1 << TICCKSEL(reg_value));
if (freq != s->freq) {
ptimer_set_freq(s->ptimer, s->freq);
DPRINTF("freq=%dHz\n", s->freq);
}
}
/* month is between 0 and 11. */
static int get_days_in_month(int month, int year)
{
static const int days_tab[12] = {
31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
};
int d;
if ((unsigned)month >= 12) {
return 31;
}
d = days_tab[month];
if (month == 1) {
if ((year % 4) == 0 && ((year % 100) != 0 || (year % 400) == 0)) {
d++;
}
}
return d;
}
/* update 'tm' to the next second */
static void rtc_next_second(struct tm *tm)
{
int days_in_month;
tm->tm_sec++;
if ((unsigned)tm->tm_sec >= 60) {
tm->tm_sec = 0;
tm->tm_min++;
if ((unsigned)tm->tm_min >= 60) {
tm->tm_min = 0;
tm->tm_hour++;
if ((unsigned)tm->tm_hour >= 24) {
tm->tm_hour = 0;
/* next day */
tm->tm_wday++;
if ((unsigned)tm->tm_wday >= 7) {
tm->tm_wday = 0;
}
days_in_month = get_days_in_month(tm->tm_mon,
tm->tm_year + 1900);
tm->tm_mday++;
if (tm->tm_mday < 1) {
tm->tm_mday = 1;
} else if (tm->tm_mday > days_in_month) {
tm->tm_mday = 1;
tm->tm_mon++;
if (tm->tm_mon >= 12) {
tm->tm_mon = 0;
tm->tm_year++;
}
}
}
}
}
}
/*
* tick handler
*/
static void exynos4210_rtc_tick(void *opaque)
{
Exynos4210RTCState *s = (Exynos4210RTCState *)opaque;
DPRINTF("TICK IRQ\n");
/* set irq status */
s->reg_intp |= INTP_TICK_ENABLE;
/* raise IRQ */
qemu_irq_raise(s->tick_irq);
/* restart timer */
ptimer_set_count(s->ptimer, s->reg_ticcnt);
ptimer_run(s->ptimer, 1);
}
/*
* 1Hz clock handler
*/
static void exynos4210_rtc_1Hz_tick(void *opaque)
{
Exynos4210RTCState *s = (Exynos4210RTCState *)opaque;
rtc_next_second(&s->current_tm);
/* DPRINTF("1Hz tick\n"); */
/* raise IRQ */
if (s->reg_rtcalm & ALARM_INT_ENABLE) {
check_alarm_raise(s);
}
ptimer_set_count(s->ptimer_1Hz, RTC_BASE_FREQ);
ptimer_run(s->ptimer_1Hz, 1);
}
/*
* RTC Read
*/
static uint64_t exynos4210_rtc_read(void *opaque, hwaddr offset,
unsigned size)
{
uint32_t value = 0;
Exynos4210RTCState *s = (Exynos4210RTCState *)opaque;
switch (offset) {
case INTP:
value = s->reg_intp;
break;
case RTCCON:
value = s->reg_rtccon;
break;
case TICCNT:
value = s->reg_ticcnt;
break;
case RTCALM:
value = s->reg_rtcalm;
break;
case ALMSEC:
value = s->reg_almsec;
break;
case ALMMIN:
value = s->reg_almmin;
break;
case ALMHOUR:
value = s->reg_almhour;
break;
case ALMDAY:
value = s->reg_almday;
break;
case ALMMON:
value = s->reg_almmon;
break;
case ALMYEAR:
value = s->reg_almyear;
break;
case BCDSEC:
value = (uint32_t)to_bcd((uint8_t)s->current_tm.tm_sec);
break;
case BCDMIN:
value = (uint32_t)to_bcd((uint8_t)s->current_tm.tm_min);
break;
case BCDHOUR:
value = (uint32_t)to_bcd((uint8_t)s->current_tm.tm_hour);
break;
case BCDDAYWEEK:
value = (uint32_t)to_bcd((uint8_t)s->current_tm.tm_wday);
break;
case BCDDAY:
value = (uint32_t)to_bcd((uint8_t)s->current_tm.tm_mday);
break;
case BCDMON:
value = (uint32_t)to_bcd((uint8_t)s->current_tm.tm_mon + 1);
break;
case BCDYEAR:
value = BCD3DIGITS(s->current_tm.tm_year);
break;
case CURTICNT:
s->reg_curticcnt = ptimer_get_count(s->ptimer);
value = s->reg_curticcnt;
break;
default:
qemu_log_mask(LOG_GUEST_ERROR,
"exynos4210.rtc: bad read offset " TARGET_FMT_plx,
offset);
break;
}
return value;
}
/*
* RTC Write
*/
static void exynos4210_rtc_write(void *opaque, hwaddr offset,
uint64_t value, unsigned size)
{
Exynos4210RTCState *s = (Exynos4210RTCState *)opaque;
switch (offset) {
case INTP:
if (value & INTP_ALM_ENABLE) {
qemu_irq_lower(s->alm_irq);
s->reg_intp &= (~INTP_ALM_ENABLE);
}
if (value & INTP_TICK_ENABLE) {
qemu_irq_lower(s->tick_irq);
s->reg_intp &= (~INTP_TICK_ENABLE);
}
break;
case RTCCON:
ptimer_transaction_begin(s->ptimer_1Hz);
ptimer_transaction_begin(s->ptimer);
if (value & RTC_ENABLE) {
exynos4210_rtc_update_freq(s, value);
}
if ((value & RTC_ENABLE) > (s->reg_rtccon & RTC_ENABLE)) {
/* clock timer */
ptimer_set_count(s->ptimer_1Hz, RTC_BASE_FREQ);
ptimer_run(s->ptimer_1Hz, 1);
DPRINTF("run clock timer\n");
}
if ((value & RTC_ENABLE) < (s->reg_rtccon & RTC_ENABLE)) {
/* tick timer */
ptimer_stop(s->ptimer);
/* clock timer */
ptimer_stop(s->ptimer_1Hz);
DPRINTF("stop all timers\n");
}
if (value & RTC_ENABLE) {
if ((value & TICK_TIMER_ENABLE) >
(s->reg_rtccon & TICK_TIMER_ENABLE) &&
(s->reg_ticcnt)) {
ptimer_set_count(s->ptimer, s->reg_ticcnt);
ptimer_run(s->ptimer, 1);
DPRINTF("run tick timer\n");
}
if ((value & TICK_TIMER_ENABLE) <
(s->reg_rtccon & TICK_TIMER_ENABLE)) {
ptimer_stop(s->ptimer);
}
}
ptimer_transaction_commit(s->ptimer_1Hz);
ptimer_transaction_commit(s->ptimer);
s->reg_rtccon = value;
break;
case TICCNT:
if (value > TICNT_THRESHOLD) {
s->reg_ticcnt = value;
} else {
qemu_log_mask(LOG_GUEST_ERROR,
"exynos4210.rtc: bad TICNT value %u",
(uint32_t)value);
}
break;
case RTCALM:
s->reg_rtcalm = value;
break;
case ALMSEC:
s->reg_almsec = (value & 0x7f);
break;
case ALMMIN:
s->reg_almmin = (value & 0x7f);
break;
case ALMHOUR:
s->reg_almhour = (value & 0x3f);
break;
case ALMDAY:
s->reg_almday = (value & 0x3f);
break;
case ALMMON:
s->reg_almmon = (value & 0x1f);
break;
case ALMYEAR:
s->reg_almyear = (value & 0x0fff);
break;
case BCDSEC:
if (s->reg_rtccon & RTC_ENABLE) {
s->current_tm.tm_sec = (int)from_bcd((uint8_t)value);
}
break;
case BCDMIN:
if (s->reg_rtccon & RTC_ENABLE) {
s->current_tm.tm_min = (int)from_bcd((uint8_t)value);
}
break;
case BCDHOUR:
if (s->reg_rtccon & RTC_ENABLE) {
s->current_tm.tm_hour = (int)from_bcd((uint8_t)value);
}
break;
case BCDDAYWEEK:
if (s->reg_rtccon & RTC_ENABLE) {
s->current_tm.tm_wday = (int)from_bcd((uint8_t)value);
}
break;
case BCDDAY:
if (s->reg_rtccon & RTC_ENABLE) {
s->current_tm.tm_mday = (int)from_bcd((uint8_t)value);
}
break;
case BCDMON:
if (s->reg_rtccon & RTC_ENABLE) {
s->current_tm.tm_mon = (int)from_bcd((uint8_t)value) - 1;
}
break;
case BCDYEAR:
if (s->reg_rtccon & RTC_ENABLE) {
/* 3 digits */
s->current_tm.tm_year = (int)from_bcd((uint8_t)value) +
(int)from_bcd((uint8_t)((value >> 8) & 0x0f)) * 100;
}
break;
default:
qemu_log_mask(LOG_GUEST_ERROR,
"exynos4210.rtc: bad write offset " TARGET_FMT_plx,
offset);
break;
}
}
/*
* Set default values to timer fields and registers
*/
static void exynos4210_rtc_reset(DeviceState *d)
{
Exynos4210RTCState *s = EXYNOS4210_RTC(d);
qemu_get_timedate(&s->current_tm, 0);
DPRINTF("Get time from host: %d-%d-%d %2d:%02d:%02d\n",
s->current_tm.tm_year, s->current_tm.tm_mon, s->current_tm.tm_mday,
s->current_tm.tm_hour, s->current_tm.tm_min, s->current_tm.tm_sec);
s->reg_intp = 0;
s->reg_rtccon = 0;
s->reg_ticcnt = 0;
s->reg_rtcalm = 0;
s->reg_almsec = 0;
s->reg_almmin = 0;
s->reg_almhour = 0;
s->reg_almday = 0;
s->reg_almmon = 0;
s->reg_almyear = 0;
s->reg_curticcnt = 0;
ptimer_transaction_begin(s->ptimer);
exynos4210_rtc_update_freq(s, s->reg_rtccon);
ptimer_stop(s->ptimer);
ptimer_transaction_commit(s->ptimer);
ptimer_transaction_begin(s->ptimer_1Hz);
ptimer_stop(s->ptimer_1Hz);
ptimer_transaction_commit(s->ptimer_1Hz);
}
static const MemoryRegionOps exynos4210_rtc_ops = {
.read = exynos4210_rtc_read,
.write = exynos4210_rtc_write,
.endianness = DEVICE_NATIVE_ENDIAN,
};
/*
* RTC timer initialization
*/
static void exynos4210_rtc_init(Object *obj)
{
Exynos4210RTCState *s = EXYNOS4210_RTC(obj);
SysBusDevice *dev = SYS_BUS_DEVICE(obj);
s->ptimer = ptimer_init(exynos4210_rtc_tick, s, PTIMER_POLICY_LEGACY);
ptimer_transaction_begin(s->ptimer);
ptimer_set_freq(s->ptimer, RTC_BASE_FREQ);
exynos4210_rtc_update_freq(s, 0);
ptimer_transaction_commit(s->ptimer);
s->ptimer_1Hz = ptimer_init(exynos4210_rtc_1Hz_tick,
s, PTIMER_POLICY_LEGACY);
ptimer_transaction_begin(s->ptimer_1Hz);
ptimer_set_freq(s->ptimer_1Hz, RTC_BASE_FREQ);
ptimer_transaction_commit(s->ptimer_1Hz);
sysbus_init_irq(dev, &s->alm_irq);
sysbus_init_irq(dev, &s->tick_irq);
memory_region_init_io(&s->iomem, obj, &exynos4210_rtc_ops, s,
"exynos4210-rtc", EXYNOS4210_RTC_REG_MEM_SIZE);
sysbus_init_mmio(dev, &s->iomem);
}
static void exynos4210_rtc_finalize(Object *obj)
{
Exynos4210RTCState *s = EXYNOS4210_RTC(obj);
ptimer_free(s->ptimer);
ptimer_free(s->ptimer_1Hz);
}
static void exynos4210_rtc_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->reset = exynos4210_rtc_reset;
dc->vmsd = &vmstate_exynos4210_rtc_state;
}
static const TypeInfo exynos4210_rtc_info = {
.name = TYPE_EXYNOS4210_RTC,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(Exynos4210RTCState),
.instance_init = exynos4210_rtc_init,
.instance_finalize = exynos4210_rtc_finalize,
.class_init = exynos4210_rtc_class_init,
};
static void exynos4210_rtc_register_types(void)
{
type_register_static(&exynos4210_rtc_info);
}
type_init(exynos4210_rtc_register_types)
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