| /* |
| * 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 "system/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 = (const 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 frequency 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 " HWADDR_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 " HWADDR_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); |
| |
| device_class_set_legacy_reset(dc, 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) |
