597 lines
16 KiB
C
597 lines
16 KiB
C
/*
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* Samsung exynos4210 Real Time Clock
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*
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* Copyright (c) 2012 Samsung Electronics Co., Ltd.
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* Ogurtsov Oleg <o.ogurtsov@samsung.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, see <http://www.gnu.org/licenses/>.
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*
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*/
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/* Description:
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* Register RTCCON:
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* CLKSEL Bit[1] not used
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* CLKOUTEN Bit[9] not used
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*/
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#include "hw/sysbus.h"
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#include "qemu/timer.h"
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#include "qemu-common.h"
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#include "hw/ptimer.h"
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#include "hw/hw.h"
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#include "sysemu/sysemu.h"
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#include "hw/arm/exynos4210.h"
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#define DEBUG_RTC 0
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#if DEBUG_RTC
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#define DPRINTF(fmt, ...) \
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do { fprintf(stdout, "RTC: [%24s:%5d] " fmt, __func__, __LINE__, \
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## __VA_ARGS__); } while (0)
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#else
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#define DPRINTF(fmt, ...) do {} while (0)
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#endif
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#define EXYNOS4210_RTC_REG_MEM_SIZE 0x0100
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#define INTP 0x0030
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#define RTCCON 0x0040
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#define TICCNT 0x0044
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#define RTCALM 0x0050
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#define ALMSEC 0x0054
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#define ALMMIN 0x0058
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#define ALMHOUR 0x005C
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#define ALMDAY 0x0060
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#define ALMMON 0x0064
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#define ALMYEAR 0x0068
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#define BCDSEC 0x0070
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#define BCDMIN 0x0074
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#define BCDHOUR 0x0078
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#define BCDDAY 0x007C
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#define BCDDAYWEEK 0x0080
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#define BCDMON 0x0084
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#define BCDYEAR 0x0088
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#define CURTICNT 0x0090
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#define TICK_TIMER_ENABLE 0x0100
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#define TICNT_THRESHHOLD 2
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#define RTC_ENABLE 0x0001
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#define INTP_TICK_ENABLE 0x0001
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#define INTP_ALM_ENABLE 0x0002
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#define ALARM_INT_ENABLE 0x0040
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#define RTC_BASE_FREQ 32768
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#define TYPE_EXYNOS4210_RTC "exynos4210.rtc"
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#define EXYNOS4210_RTC(obj) \
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OBJECT_CHECK(Exynos4210RTCState, (obj), TYPE_EXYNOS4210_RTC)
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typedef struct Exynos4210RTCState {
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SysBusDevice parent_obj;
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MemoryRegion iomem;
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/* registers */
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uint32_t reg_intp;
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uint32_t reg_rtccon;
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uint32_t reg_ticcnt;
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uint32_t reg_rtcalm;
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uint32_t reg_almsec;
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uint32_t reg_almmin;
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uint32_t reg_almhour;
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uint32_t reg_almday;
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uint32_t reg_almmon;
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uint32_t reg_almyear;
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uint32_t reg_curticcnt;
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ptimer_state *ptimer; /* tick timer */
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ptimer_state *ptimer_1Hz; /* clock timer */
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uint32_t freq;
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qemu_irq tick_irq; /* Time Tick Generator irq */
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qemu_irq alm_irq; /* alarm irq */
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struct tm current_tm; /* current time */
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} Exynos4210RTCState;
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#define TICCKSEL(value) ((value & (0x0F << 4)) >> 4)
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/*** VMState ***/
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static const VMStateDescription vmstate_exynos4210_rtc_state = {
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.name = "exynos4210.rtc",
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.version_id = 1,
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.minimum_version_id = 1,
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.minimum_version_id_old = 1,
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.fields = (VMStateField[]) {
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VMSTATE_UINT32(reg_intp, Exynos4210RTCState),
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VMSTATE_UINT32(reg_rtccon, Exynos4210RTCState),
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VMSTATE_UINT32(reg_ticcnt, Exynos4210RTCState),
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VMSTATE_UINT32(reg_rtcalm, Exynos4210RTCState),
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VMSTATE_UINT32(reg_almsec, Exynos4210RTCState),
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VMSTATE_UINT32(reg_almmin, Exynos4210RTCState),
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VMSTATE_UINT32(reg_almhour, Exynos4210RTCState),
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VMSTATE_UINT32(reg_almday, Exynos4210RTCState),
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VMSTATE_UINT32(reg_almmon, Exynos4210RTCState),
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VMSTATE_UINT32(reg_almyear, Exynos4210RTCState),
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VMSTATE_UINT32(reg_curticcnt, Exynos4210RTCState),
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VMSTATE_PTIMER(ptimer, Exynos4210RTCState),
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VMSTATE_PTIMER(ptimer_1Hz, Exynos4210RTCState),
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VMSTATE_UINT32(freq, Exynos4210RTCState),
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VMSTATE_INT32(current_tm.tm_sec, Exynos4210RTCState),
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VMSTATE_INT32(current_tm.tm_min, Exynos4210RTCState),
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VMSTATE_INT32(current_tm.tm_hour, Exynos4210RTCState),
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VMSTATE_INT32(current_tm.tm_wday, Exynos4210RTCState),
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VMSTATE_INT32(current_tm.tm_mday, Exynos4210RTCState),
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VMSTATE_INT32(current_tm.tm_mon, Exynos4210RTCState),
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VMSTATE_INT32(current_tm.tm_year, Exynos4210RTCState),
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VMSTATE_END_OF_LIST()
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}
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};
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#define BCD3DIGITS(x) \
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((uint32_t)to_bcd((uint8_t)(x % 100)) + \
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((uint32_t)to_bcd((uint8_t)((x % 1000) / 100)) << 8))
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static void check_alarm_raise(Exynos4210RTCState *s)
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{
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unsigned int alarm_raise = 0;
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struct tm stm = s->current_tm;
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if ((s->reg_rtcalm & 0x01) &&
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(to_bcd((uint8_t)stm.tm_sec) == (uint8_t)s->reg_almsec)) {
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alarm_raise = 1;
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}
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if ((s->reg_rtcalm & 0x02) &&
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(to_bcd((uint8_t)stm.tm_min) == (uint8_t)s->reg_almmin)) {
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alarm_raise = 1;
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}
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if ((s->reg_rtcalm & 0x04) &&
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(to_bcd((uint8_t)stm.tm_hour) == (uint8_t)s->reg_almhour)) {
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alarm_raise = 1;
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}
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if ((s->reg_rtcalm & 0x08) &&
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(to_bcd((uint8_t)stm.tm_mday) == (uint8_t)s->reg_almday)) {
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alarm_raise = 1;
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}
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if ((s->reg_rtcalm & 0x10) &&
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(to_bcd((uint8_t)stm.tm_mon) == (uint8_t)s->reg_almmon)) {
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alarm_raise = 1;
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}
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if ((s->reg_rtcalm & 0x20) &&
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(BCD3DIGITS(stm.tm_year) == s->reg_almyear)) {
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alarm_raise = 1;
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}
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if (alarm_raise) {
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DPRINTF("ALARM IRQ\n");
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/* set irq status */
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s->reg_intp |= INTP_ALM_ENABLE;
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qemu_irq_raise(s->alm_irq);
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}
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}
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/*
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* RTC update frequency
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* Parameters:
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* reg_value - current RTCCON register or his new value
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*/
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static void exynos4210_rtc_update_freq(Exynos4210RTCState *s,
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uint32_t reg_value)
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{
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uint32_t freq;
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freq = s->freq;
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/* set frequncy for time generator */
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s->freq = RTC_BASE_FREQ / (1 << TICCKSEL(reg_value));
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if (freq != s->freq) {
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ptimer_set_freq(s->ptimer, s->freq);
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DPRINTF("freq=%dHz\n", s->freq);
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}
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}
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/* month is between 0 and 11. */
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static int get_days_in_month(int month, int year)
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{
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static const int days_tab[12] = {
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31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
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};
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int d;
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if ((unsigned)month >= 12) {
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return 31;
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}
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d = days_tab[month];
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if (month == 1) {
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if ((year % 4) == 0 && ((year % 100) != 0 || (year % 400) == 0)) {
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d++;
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}
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}
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return d;
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}
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/* update 'tm' to the next second */
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static void rtc_next_second(struct tm *tm)
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{
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int days_in_month;
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tm->tm_sec++;
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if ((unsigned)tm->tm_sec >= 60) {
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tm->tm_sec = 0;
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tm->tm_min++;
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if ((unsigned)tm->tm_min >= 60) {
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tm->tm_min = 0;
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tm->tm_hour++;
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if ((unsigned)tm->tm_hour >= 24) {
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tm->tm_hour = 0;
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/* next day */
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tm->tm_wday++;
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if ((unsigned)tm->tm_wday >= 7) {
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tm->tm_wday = 0;
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}
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days_in_month = get_days_in_month(tm->tm_mon,
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tm->tm_year + 1900);
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tm->tm_mday++;
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if (tm->tm_mday < 1) {
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tm->tm_mday = 1;
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} else if (tm->tm_mday > days_in_month) {
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tm->tm_mday = 1;
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tm->tm_mon++;
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if (tm->tm_mon >= 12) {
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tm->tm_mon = 0;
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tm->tm_year++;
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}
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}
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}
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}
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}
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}
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/*
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* tick handler
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*/
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static void exynos4210_rtc_tick(void *opaque)
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{
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Exynos4210RTCState *s = (Exynos4210RTCState *)opaque;
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DPRINTF("TICK IRQ\n");
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/* set irq status */
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s->reg_intp |= INTP_TICK_ENABLE;
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/* raise IRQ */
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qemu_irq_raise(s->tick_irq);
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/* restart timer */
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ptimer_set_count(s->ptimer, s->reg_ticcnt);
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ptimer_run(s->ptimer, 1);
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}
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/*
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* 1Hz clock handler
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*/
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static void exynos4210_rtc_1Hz_tick(void *opaque)
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{
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Exynos4210RTCState *s = (Exynos4210RTCState *)opaque;
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rtc_next_second(&s->current_tm);
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/* DPRINTF("1Hz tick\n"); */
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/* raise IRQ */
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if (s->reg_rtcalm & ALARM_INT_ENABLE) {
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check_alarm_raise(s);
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}
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ptimer_set_count(s->ptimer_1Hz, RTC_BASE_FREQ);
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ptimer_run(s->ptimer_1Hz, 1);
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}
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/*
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* RTC Read
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*/
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static uint64_t exynos4210_rtc_read(void *opaque, hwaddr offset,
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unsigned size)
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{
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uint32_t value = 0;
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Exynos4210RTCState *s = (Exynos4210RTCState *)opaque;
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switch (offset) {
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case INTP:
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value = s->reg_intp;
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break;
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case RTCCON:
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value = s->reg_rtccon;
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break;
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case TICCNT:
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value = s->reg_ticcnt;
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break;
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case RTCALM:
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value = s->reg_rtcalm;
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break;
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case ALMSEC:
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value = s->reg_almsec;
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break;
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case ALMMIN:
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value = s->reg_almmin;
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break;
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case ALMHOUR:
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value = s->reg_almhour;
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break;
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case ALMDAY:
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value = s->reg_almday;
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break;
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case ALMMON:
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value = s->reg_almmon;
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break;
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case ALMYEAR:
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value = s->reg_almyear;
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break;
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case BCDSEC:
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value = (uint32_t)to_bcd((uint8_t)s->current_tm.tm_sec);
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break;
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case BCDMIN:
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value = (uint32_t)to_bcd((uint8_t)s->current_tm.tm_min);
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break;
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case BCDHOUR:
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value = (uint32_t)to_bcd((uint8_t)s->current_tm.tm_hour);
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break;
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case BCDDAYWEEK:
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value = (uint32_t)to_bcd((uint8_t)s->current_tm.tm_wday);
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break;
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case BCDDAY:
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value = (uint32_t)to_bcd((uint8_t)s->current_tm.tm_mday);
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break;
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case BCDMON:
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value = (uint32_t)to_bcd((uint8_t)s->current_tm.tm_mon + 1);
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break;
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case BCDYEAR:
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value = BCD3DIGITS(s->current_tm.tm_year);
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break;
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case CURTICNT:
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s->reg_curticcnt = ptimer_get_count(s->ptimer);
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value = s->reg_curticcnt;
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break;
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default:
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fprintf(stderr,
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"[exynos4210.rtc: bad read offset " TARGET_FMT_plx "]\n",
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offset);
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break;
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}
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return value;
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}
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/*
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* RTC Write
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*/
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static void exynos4210_rtc_write(void *opaque, hwaddr offset,
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uint64_t value, unsigned size)
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{
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Exynos4210RTCState *s = (Exynos4210RTCState *)opaque;
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switch (offset) {
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case INTP:
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if (value & INTP_ALM_ENABLE) {
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qemu_irq_lower(s->alm_irq);
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s->reg_intp &= (~INTP_ALM_ENABLE);
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}
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if (value & INTP_TICK_ENABLE) {
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qemu_irq_lower(s->tick_irq);
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s->reg_intp &= (~INTP_TICK_ENABLE);
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}
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break;
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case RTCCON:
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if (value & RTC_ENABLE) {
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exynos4210_rtc_update_freq(s, value);
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}
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if ((value & RTC_ENABLE) > (s->reg_rtccon & RTC_ENABLE)) {
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/* clock timer */
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ptimer_set_count(s->ptimer_1Hz, RTC_BASE_FREQ);
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ptimer_run(s->ptimer_1Hz, 1);
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DPRINTF("run clock timer\n");
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}
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if ((value & RTC_ENABLE) < (s->reg_rtccon & RTC_ENABLE)) {
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/* tick timer */
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ptimer_stop(s->ptimer);
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/* clock timer */
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ptimer_stop(s->ptimer_1Hz);
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DPRINTF("stop all timers\n");
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}
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if (value & RTC_ENABLE) {
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if ((value & TICK_TIMER_ENABLE) >
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(s->reg_rtccon & TICK_TIMER_ENABLE) &&
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(s->reg_ticcnt)) {
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ptimer_set_count(s->ptimer, s->reg_ticcnt);
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ptimer_run(s->ptimer, 1);
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DPRINTF("run tick timer\n");
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}
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if ((value & TICK_TIMER_ENABLE) <
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(s->reg_rtccon & TICK_TIMER_ENABLE)) {
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ptimer_stop(s->ptimer);
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}
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}
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s->reg_rtccon = value;
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break;
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case TICCNT:
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if (value > TICNT_THRESHHOLD) {
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s->reg_ticcnt = value;
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} else {
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fprintf(stderr,
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"[exynos4210.rtc: bad TICNT value %u ]\n",
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(uint32_t)value);
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}
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break;
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case RTCALM:
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s->reg_rtcalm = value;
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break;
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case ALMSEC:
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s->reg_almsec = (value & 0x7f);
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break;
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case ALMMIN:
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s->reg_almmin = (value & 0x7f);
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break;
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case ALMHOUR:
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s->reg_almhour = (value & 0x3f);
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break;
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case ALMDAY:
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s->reg_almday = (value & 0x3f);
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break;
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case ALMMON:
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s->reg_almmon = (value & 0x1f);
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break;
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case ALMYEAR:
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s->reg_almyear = (value & 0x0fff);
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break;
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case BCDSEC:
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if (s->reg_rtccon & RTC_ENABLE) {
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s->current_tm.tm_sec = (int)from_bcd((uint8_t)value);
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}
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break;
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case BCDMIN:
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if (s->reg_rtccon & RTC_ENABLE) {
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s->current_tm.tm_min = (int)from_bcd((uint8_t)value);
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}
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break;
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case BCDHOUR:
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if (s->reg_rtccon & RTC_ENABLE) {
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s->current_tm.tm_hour = (int)from_bcd((uint8_t)value);
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}
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break;
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case BCDDAYWEEK:
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if (s->reg_rtccon & RTC_ENABLE) {
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s->current_tm.tm_wday = (int)from_bcd((uint8_t)value);
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}
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break;
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case BCDDAY:
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if (s->reg_rtccon & RTC_ENABLE) {
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s->current_tm.tm_mday = (int)from_bcd((uint8_t)value);
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}
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break;
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case BCDMON:
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if (s->reg_rtccon & RTC_ENABLE) {
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s->current_tm.tm_mon = (int)from_bcd((uint8_t)value) - 1;
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}
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break;
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case BCDYEAR:
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if (s->reg_rtccon & RTC_ENABLE) {
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/* 3 digits */
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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 = 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;
|
|
|
|
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 = EXYNOS4210_RTC(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, OBJECT(s), &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 = TYPE_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)
|