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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2001
* Denis Peter MPL AG Switzerland. d.peter@mpl.ch
*/
/*
* Date & Time support for the MC146818 (PIXX4) RTC
*/
#include <common.h>
#include <command.h>
#include <dm.h>
#include <rtc.h>
#if defined(CONFIG_X86) || defined(CONFIG_MALTA)
#include <asm/io.h>
#define in8(p) inb(p)
#define out8(p, v) outb(v, p)
#endif
/* Set this to 1 to clear the CMOS RAM */
#define CLEAR_CMOS 0
#define RTC_PORT_MC146818 CONFIG_SYS_ISA_IO_BASE_ADDRESS + 0x70
#define RTC_SECONDS 0x00
#define RTC_SECONDS_ALARM 0x01
#define RTC_MINUTES 0x02
#define RTC_MINUTES_ALARM 0x03
#define RTC_HOURS 0x04
#define RTC_HOURS_ALARM 0x05
#define RTC_DAY_OF_WEEK 0x06
#define RTC_DATE_OF_MONTH 0x07
#define RTC_MONTH 0x08
#define RTC_YEAR 0x09
#define RTC_CONFIG_A 0x0a
#define RTC_CONFIG_B 0x0b
#define RTC_CONFIG_C 0x0c
#define RTC_CONFIG_D 0x0d
#define RTC_REG_SIZE 0x80
#define RTC_CONFIG_A_REF_CLCK_32KHZ (1 << 5)
#define RTC_CONFIG_A_RATE_1024HZ 6
#define RTC_CONFIG_B_24H (1 << 1)
#define RTC_CONFIG_D_VALID_RAM_AND_TIME 0x80
static int mc146818_read8(int reg)
{
#ifdef CONFIG_SYS_RTC_REG_BASE_ADDR
return in8(CONFIG_SYS_RTC_REG_BASE_ADDR + reg);
#else
int ofs = 0;
if (reg >= 128) {
ofs = 2;
reg -= 128;
}
out8(RTC_PORT_MC146818 + ofs, reg);
return in8(RTC_PORT_MC146818 + ofs + 1);
#endif
}
static void mc146818_write8(int reg, uchar val)
{
#ifdef CONFIG_SYS_RTC_REG_BASE_ADDR
out8(CONFIG_SYS_RTC_REG_BASE_ADDR + reg, val);
#else
int ofs = 0;
if (reg >= 128) {
ofs = 2;
reg -= 128;
}
out8(RTC_PORT_MC146818 + ofs, reg);
out8(RTC_PORT_MC146818 + ofs + 1, val);
#endif
}
static int mc146818_get(struct rtc_time *tmp)
{
uchar sec, min, hour, mday, wday __attribute__((unused)),mon, year;
/* here check if rtc can be accessed */
while ((mc146818_read8(RTC_CONFIG_A) & 0x80) == 0x80)
;
sec = mc146818_read8(RTC_SECONDS);
min = mc146818_read8(RTC_MINUTES);
hour = mc146818_read8(RTC_HOURS);
mday = mc146818_read8(RTC_DATE_OF_MONTH);
wday = mc146818_read8(RTC_DAY_OF_WEEK);
mon = mc146818_read8(RTC_MONTH);
year = mc146818_read8(RTC_YEAR);
#ifdef RTC_DEBUG
printf("Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x hr: %02x min: %02x sec: %02x\n",
year, mon, mday, wday, hour, min, sec);
printf("Alarms: mday: %02x hour: %02x min: %02x sec: %02x\n",
mc146818_read8(RTC_CONFIG_D) & 0x3f,
mc146818_read8(RTC_HOURS_ALARM),
mc146818_read8(RTC_MINUTES_ALARM),
mc146818_read8(RTC_SECONDS_ALARM));
#endif
tmp->tm_sec = bcd2bin(sec & 0x7f);
tmp->tm_min = bcd2bin(min & 0x7f);
tmp->tm_hour = bcd2bin(hour & 0x3f);
tmp->tm_mday = bcd2bin(mday & 0x3f);
tmp->tm_mon = bcd2bin(mon & 0x1f);
tmp->tm_year = bcd2bin(year);
if (tmp->tm_year < 70)
tmp->tm_year += 2000;
else
tmp->tm_year += 1900;
tmp->tm_yday = 0;
tmp->tm_isdst = 0;
/*
* The mc146818 only updates wday if it is non-zero, sunday is 1
* saturday is 7. So let's use our library routine.
*/
rtc_calc_weekday(tmp);
#ifdef RTC_DEBUG
printf("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
#endif
return 0;
}
static int mc146818_set(struct rtc_time *tmp)
{
#ifdef RTC_DEBUG
printf("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
#endif
/* Disable the RTC to update the regs */
mc146818_write8(RTC_CONFIG_B, 0x82);
mc146818_write8(RTC_YEAR, bin2bcd(tmp->tm_year % 100));
mc146818_write8(RTC_MONTH, bin2bcd(tmp->tm_mon));
/* Sunday = 1, Saturday = 7 */
mc146818_write8(RTC_DAY_OF_WEEK, bin2bcd(tmp->tm_wday + 1));
mc146818_write8(RTC_DATE_OF_MONTH, bin2bcd(tmp->tm_mday));
mc146818_write8(RTC_HOURS, bin2bcd(tmp->tm_hour));
mc146818_write8(RTC_MINUTES, bin2bcd(tmp->tm_min));
mc146818_write8(RTC_SECONDS, bin2bcd(tmp->tm_sec));
/* Enable the RTC to update the regs */
mc146818_write8(RTC_CONFIG_B, 0x02);
return 0;
}
static void mc146818_reset(void)
{
/* Disable the RTC to update the regs */
mc146818_write8(RTC_CONFIG_B, 0x82);
/* Normal OP */
mc146818_write8(RTC_CONFIG_A, 0x20);
mc146818_write8(RTC_CONFIG_B, 0x00);
mc146818_write8(RTC_CONFIG_B, 0x00);
/* Enable the RTC to update the regs */
mc146818_write8(RTC_CONFIG_B, 0x02);
}
static void mc146818_init(void)
{
#if CLEAR_CMOS
int i;
rtc_write8(RTC_SECONDS_ALARM, 0);
rtc_write8(RTC_MINUTES_ALARM, 0);
rtc_write8(RTC_HOURS_ALARM, 0);
for (i = RTC_CONFIG_A; i < RTC_REG_SIZE; i++)
rtc_write8(i, 0);
printf("RTC: zeroing CMOS RAM\n");
#endif
/* Setup the real time clock */
mc146818_write8(RTC_CONFIG_B, RTC_CONFIG_B_24H);
/* Setup the frequency it operates at */
mc146818_write8(RTC_CONFIG_A, RTC_CONFIG_A_REF_CLCK_32KHZ |
RTC_CONFIG_A_RATE_1024HZ);
/* Ensure all reserved bits are 0 in register D */
mc146818_write8(RTC_CONFIG_D, RTC_CONFIG_D_VALID_RAM_AND_TIME);
/* Clear any pending interrupts */
mc146818_read8(RTC_CONFIG_C);
}
#ifdef CONFIG_DM_RTC
static int rtc_mc146818_get(struct udevice *dev, struct rtc_time *time)
{
return mc146818_get(time);
}
static int rtc_mc146818_set(struct udevice *dev, const struct rtc_time *time)
{
return mc146818_set((struct rtc_time *)time);
}
static int rtc_mc146818_reset(struct udevice *dev)
{
mc146818_reset();
return 0;
}
static int rtc_mc146818_read8(struct udevice *dev, unsigned int reg)
{
return mc146818_read8(reg);
}
static int rtc_mc146818_write8(struct udevice *dev, unsigned int reg, int val)
{
mc146818_write8(reg, val);
return 0;
}
static int rtc_mc146818_probe(struct udevice *dev)
{
mc146818_init();
return 0;
}
static const struct rtc_ops rtc_mc146818_ops = {
.get = rtc_mc146818_get,
.set = rtc_mc146818_set,
.reset = rtc_mc146818_reset,
.read8 = rtc_mc146818_read8,
.write8 = rtc_mc146818_write8,
};
static const struct udevice_id rtc_mc146818_ids[] = {
{ .compatible = "motorola,mc146818" },
{ }
};
U_BOOT_DRIVER(rtc_mc146818) = {
.name = "rtc_mc146818",
.id = UCLASS_RTC,
.of_match = rtc_mc146818_ids,
.probe = rtc_mc146818_probe,
.ops = &rtc_mc146818_ops,
};
#else /* !CONFIG_DM_RTC */
int rtc_get(struct rtc_time *tmp)
{
return mc146818_get(tmp);
}
int rtc_set(struct rtc_time *tmp)
{
return mc146818_set(tmp);
}
void rtc_reset(void)
{
mc146818_reset();
}
int rtc_read8(int reg)
{
return mc146818_read8(reg);
}
void rtc_write8(int reg, uchar val)
{
mc146818_write8(reg, val);
}
u32 rtc_read32(int reg)
{
u32 value = 0;
int i;
for (i = 0; i < sizeof(value); i++)
value |= rtc_read8(reg + i) << (i << 3);
return value;
}
void rtc_write32(int reg, u32 value)
{
int i;
for (i = 0; i < sizeof(value); i++)
rtc_write8(reg + i, (value >> (i << 3)) & 0xff);
}
void rtc_init(void)
{
mc146818_init();
}
#endif /* CONFIG_DM_RTC */
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