64 lines
1.6 KiB
C
64 lines
1.6 KiB
C
#include <assert.h>
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#include <rtc.h>
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#include <stdint.h>
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#define VIRT_RTC_BASE 0x0101000UL
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#define VIRT_RTC_SIZE 0x1000
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#define RTC_TIME_LOW 0x00
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#define RTC_TIME_HIGH 0x04
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#define RTC_ALARM_LOW 0x08
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#define RTC_ALARM_HIGH 0x0c
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#define RTC_ALARM_STATUS 0x18
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#define RTC_CLEAR_ALARM 0x14
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#define RTC_IRQ_ENABLED 0x10
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#define RTC_IRQ_CLEAR 0x1c
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#define REG32(addr) (*((volatile uint32_t *)(addr)))
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#define REG64(addr) (*((volatile uint64_t *)(addr)))
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#define GF_REG32(offset) (REG32(VIRT_RTC_BASE + offset))
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#define GF_REG64(offset) (REG64(VIRT_RTC_BASE + offset))
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/* Read the current time of the RTC */
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uint64_t rtc_time_read(void) {
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uint32_t low = GF_REG32(RTC_TIME_LOW); // mmio_read32(VIRT_RTC_BASE + RTC_TIME_LOW);
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uint32_t high = GF_REG32(RTC_TIME_HIGH);
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return ((uint64_t)high << 32) | low;
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}
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/* Set the time of the RTC */
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void rtc_time_set(uint64_t ns) {
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GF_REG32(RTC_TIME_HIGH) = ns >> 32;
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GF_REG32(RTC_TIME_LOW) = ns & 0xFFFFFFFF;
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}
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/* Set the alarm. this will automatically enable it. */
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void rtc_alarm_set(uint64_t ns) {
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/* Order matters here, low write starts the alarm */
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GF_REG32(RTC_ALARM_HIGH) = ns >> 32;
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GF_REG32(RTC_ALARM_LOW) = ns & 0xFFFFFFFF;
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}
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uint64_t rtc_alarm_read(void) {
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uint32_t low = GF_REG32(RTC_ALARM_LOW);
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uint32_t high = GF_REG32(RTC_ALARM_HIGH);
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return ((uint64_t)high << 32) | low;
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}
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uint32_t rtc_alarm_status(void) {
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return GF_REG32(RTC_ALARM_STATUS) & 0x1;
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}
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void rtc_alarm_clear(void) {
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GF_REG32(RTC_CLEAR_ALARM) = 1;
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}
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void rtc_irq_clear(void) {
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GF_REG32(RTC_IRQ_CLEAR) = 1;
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}
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uint32_t rtc_irq_enabled(void) {
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return GF_REG32(RTC_IRQ_ENABLED) & 0x1;
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}
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