+++ /dev/null
-/**
- * @file rtc.c
- * @author Lunaixsky
- * @brief RTC & CMOS abstraction. Reference: MC146818A & Intel Series 500 PCH
- * datasheet
- * @version 0.1
- * @date 2022-03-07
- *
- * @copyright Copyright (c) 2022
- *
- */
-
-#include <lunaix/generic/isrm.h>
-#include <lunaix/mm/valloc.h>
-#include <lunaix/status.h>
-#include <lunaix/hart_state.h>
-
-#include <hal/hwrtc.h>
-
-#include <klibc/string.h>
-
-#include <sys/port_io.h>
-
-#define RTC_INDEX_PORT 0x70
-#define RTC_TARGET_PORT 0x71
-
-#define WITH_NMI_DISABLED 0x80
-
-#define RTC_CURRENT_CENTRY 20
-
-#define RTC_REG_YRS 0x9
-#define RTC_REG_MTH 0x8
-#define RTC_REG_DAY 0x7
-#define RTC_REG_WDY 0x6
-#define RTC_REG_HRS 0x4
-#define RTC_REG_MIN 0x2
-#define RTC_REG_SEC 0x0
-
-#define RTC_REG_A 0xA
-#define RTC_REG_B 0xB
-#define RTC_REG_C 0xC
-#define RTC_REG_D 0xD
-
-#define RTC_SET 0x80
-#define RTC_BIN (1 << 2)
-#define RTC_HOURFORM24 (1 << 1)
-
-#define RTC_BIN_ENCODED(reg) (reg & 0x04)
-#define RTC_24HRS_ENCODED(reg) (reg & 0x02)
-
-#define RTC_TIMER_BASE_FREQUENCY 1024
-#define RTC_TIMER_ON 0x40
-
-#define RTC_FREQUENCY_1024HZ 0b110
-#define RTC_DIVIDER_33KHZ (0b010 << 4)
-
-#define PC_AT_IRQ_RTC 8
-
-struct mc146818
-{
- struct hwrtc* rtc_context;
- u32_t rtc_iv;
- u32_t tick_counts;
-};
-
-#define rtc_state(data) ((struct mc146818*)(data))
-
-static u8_t
-rtc_read_reg(u8_t reg_selector)
-{
- port_wrbyte(RTC_INDEX_PORT, reg_selector);
- return port_rdbyte(RTC_TARGET_PORT);
-}
-
-static void
-rtc_write_reg(u8_t reg_selector, u8_t val)
-{
- port_wrbyte(RTC_INDEX_PORT, reg_selector);
- port_wrbyte(RTC_TARGET_PORT, val);
-}
-
-static void
-rtc_enable_timer()
-{
- u8_t regB = rtc_read_reg(RTC_REG_B);
- rtc_write_reg(RTC_REG_B, regB | RTC_TIMER_ON);
-}
-
-static void
-rtc_disable_timer()
-{
- u8_t regB = rtc_read_reg(RTC_REG_B);
- rtc_write_reg(RTC_REG_B, regB & ~RTC_TIMER_ON);
-}
-
-static void
-rtc_getwalltime(struct hwrtc* rtc, datetime_t* datetime)
-{
- datetime_t current;
-
- do {
- while (rtc_read_reg(RTC_REG_A) & 0x80)
- ;
- memcpy(¤t, datetime, sizeof(datetime_t));
-
- datetime->year = rtc_read_reg(RTC_REG_YRS);
- datetime->month = rtc_read_reg(RTC_REG_MTH);
- datetime->day = rtc_read_reg(RTC_REG_DAY);
- datetime->weekday = rtc_read_reg(RTC_REG_WDY);
- datetime->hour = rtc_read_reg(RTC_REG_HRS);
- datetime->minute = rtc_read_reg(RTC_REG_MIN);
- datetime->second = rtc_read_reg(RTC_REG_SEC);
- } while (!datatime_eq(datetime, ¤t));
-
- datetime->year += RTC_CURRENT_CENTRY * 100;
-}
-
-static void
-rtc_setwalltime(struct hwrtc* rtc, datetime_t* datetime)
-{
- u8_t reg = rtc_read_reg(RTC_REG_B);
- reg = reg & ~RTC_SET;
-
- rtc_write_reg(RTC_REG_B, reg | RTC_SET);
-
- rtc_write_reg(RTC_REG_YRS, datetime->year - RTC_CURRENT_CENTRY * 100);
- rtc_write_reg(RTC_REG_MTH, datetime->month);
- rtc_write_reg(RTC_REG_DAY, datetime->day);
- rtc_write_reg(RTC_REG_WDY, datetime->weekday);
- rtc_write_reg(RTC_REG_HRS, datetime->hour);
- rtc_write_reg(RTC_REG_MIN, datetime->minute);
- rtc_write_reg(RTC_REG_SEC, datetime->second);
-
- rtc_write_reg(RTC_REG_B, reg & ~RTC_SET);
-}
-
-static int
-mc146818_check_support(struct hwrtc* rtc)
-{
-#if __ARCH__ == i386
- return 1;
-#else
- return 0;
-#endif
-}
-
-static void
-__rtc_tick(const struct hart_state* hstate)
-{
- struct mc146818* state = (struct mc146818*)isrm_get_payload(hstate);
-
- state->tick_counts++;
-
- (void)rtc_read_reg(RTC_REG_C);
-}
-
-static void
-rtc_set_mask(struct hwrtc* rtc)
-{
- rtc->state = RTC_STATE_MASKED;
- rtc_disable_timer();
-}
-
-static void
-rtc_cls_mask(struct hwrtc* rtc)
-{
- struct mc146818* state = rtc_state(rtc->data);
-
- rtc->state = 0;
- state->tick_counts = 0;
- rtc_enable_timer();
-}
-
-static int
-rtc_chfreq(struct hwrtc* rtc, int freq)
-{
- return ENOTSUP;
-}
-
-static int
-rtc_getcnt(struct hwrtc* rtc)
-{
- struct mc146818* state = rtc_state(rtc->data);
- return state->tick_counts;
-}
-
-static int
-rtc_init(struct device_def* devdef)
-{
- u8_t reg = rtc_read_reg(RTC_REG_A);
- reg = (reg & ~0x7f) | RTC_FREQUENCY_1024HZ | RTC_DIVIDER_33KHZ;
- rtc_write_reg(RTC_REG_A, reg);
-
- reg = RTC_BIN | RTC_HOURFORM24;
- rtc_write_reg(RTC_REG_B, reg);
-
- // Make sure the rtc timer is disabled by default
- rtc_disable_timer();
-
- struct hwrtc* rtc = hwrtc_alloc_new("mc146818");
- struct mc146818* state = valloc(sizeof(struct mc146818));
-
- state->rtc_context = rtc;
- state->rtc_iv = isrm_bindirq(PC_AT_IRQ_RTC, __rtc_tick);
- isrm_set_payload(state->rtc_iv, (ptr_t)state);
-
- rtc->state = RTC_STATE_MASKED;
- rtc->data = state;
- rtc->base_freq = RTC_TIMER_BASE_FREQUENCY;
- rtc->get_walltime = rtc_getwalltime;
- rtc->set_walltime = rtc_setwalltime;
- rtc->set_mask = rtc_set_mask;
- rtc->cls_mask = rtc_cls_mask;
- rtc->get_counts = rtc_getcnt;
- rtc->chfreq = rtc_chfreq;
-
- hwrtc_register(&devdef->class, rtc);
-
- return 0;
-}
-
-static struct device_def devrtc_mc146818 = {
- .name = "MC146818 RTC",
- .class = DEVCLASS(DEVIF_SOC, DEVFN_TIME, DEV_RTC),
- .init = rtc_init
-};
-EXPORT_DEVICE(mc146818, &devrtc_mc146818, load_timedev);
\ No newline at end of file
git://scm.lunaixsky.com / lunaix-os.git / blobdiff