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qemu/hw/exynos4210_rtc.c
Oleg Ogurtsov 7bdf43a753 Exynos4: add RTC device 
Signed-off-by: Oleg Ogurtsov <o.ogurtsov@samsung.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2012-07-04 10:43:32 +00:00

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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 "sysbus.h"
#include "qemu-timer.h"
#include "qemu-common.h"
#include "ptimer.h"
#include "hw.h"
#include "qemu-timer.h"
#include "sysemu.h"
#include "exynos4210.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_THRESHHOLD 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
typedef struct Exynos4210RTCState {
SysBusDevice busdev;
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 */
} Exynos4210RTCState;
#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,
.minimum_version_id_old = 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) + \
((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
*/
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, target_phys_addr_t 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:
fprintf(stderr,
"[exynos4210.rtc: bad read offset " TARGET_FMT_plx "]\n",
offset);
break;
}
return value;
}
/*
* RTC Write
*/
static void exynos4210_rtc_write(void *opaque, target_phys_addr_t 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:
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);
}
}
s->reg_rtccon = value;
break;
case TICCNT:
if (value > TICNT_THRESHHOLD) {
s->reg_ticcnt = value;
} else {
fprintf(stderr,
"[exynos4210.rtc: bad TICNT value %u ]\n",
(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:
fprintf(stderr,
"[exynos4210.rtc: bad write offset " TARGET_FMT_plx "]\n",
offset);
break;
}
}
/*
* Set default values to timer fields and registers
*/
static void exynos4210_rtc_reset(DeviceState *d)
{
Exynos4210RTCState *s = (Exynos4210RTCState *)d;
struct tm tm;
qemu_get_timedate(&tm, 0);
s->current_tm = tm;
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;
exynos4210_rtc_update_freq(s, s->reg_rtccon);
ptimer_stop(s->ptimer);
ptimer_stop(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 int exynos4210_rtc_init(SysBusDevice *dev)
{
Exynos4210RTCState *s = FROM_SYSBUS(Exynos4210RTCState, dev);
QEMUBH *bh;
bh = qemu_bh_new(exynos4210_rtc_tick, s);
s->ptimer = ptimer_init(bh);
ptimer_set_freq(s->ptimer, RTC_BASE_FREQ);
exynos4210_rtc_update_freq(s, 0);
bh = qemu_bh_new(exynos4210_rtc_1Hz_tick, s);
s->ptimer_1Hz = ptimer_init(bh);
ptimer_set_freq(s->ptimer_1Hz, RTC_BASE_FREQ);
sysbus_init_irq(dev, &s->alm_irq);
sysbus_init_irq(dev, &s->tick_irq);
memory_region_init_io(&s->iomem, &exynos4210_rtc_ops, s, "exynos4210-rtc",
EXYNOS4210_RTC_REG_MEM_SIZE);
sysbus_init_mmio(dev, &s->iomem);
return 0;
}
static void exynos4210_rtc_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
k->init = exynos4210_rtc_init;
dc->reset = exynos4210_rtc_reset;
dc->vmsd = &vmstate_exynos4210_rtc_state;
}
static const TypeInfo exynos4210_rtc_info = {
.name = "exynos4210.rtc",
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(Exynos4210RTCState),
.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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