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u-boot/drivers/rtc/ds3231.c
Tom Rini 65cc0e2a65 global: Move remaining CONFIG_SYS_* to CFG_SYS_* 
The rest of the unmigrated CONFIG symbols in the CONFIG_SYS namespace do
not easily transition to Kconfig. In many cases they likely should come
from the device tree instead. Move these out of CONFIG namespace and in
to CFG namespace.

Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
2022-12-05 16:06:08 -05:00

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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2006
* Markus Klotzbuecher, mk@denx.de
*
* (C) Copyright 2019 NXP
* Chuanhua Han <chuanhua.han@nxp.com>
*/
/*
* Date & Time support (no alarms) for Dallas Semiconductor (now Maxim)
* Extremly Accurate DS3231 Real Time Clock (RTC).
*
* copied from ds1337.c
*/
#include <common.h>
#include <command.h>
#include <dm.h>
#include <log.h>
#include <rtc.h>
#include <i2c.h>
/*
* RTC register addresses
*/
#define RTC_SEC_REG_ADDR 0x0
#define RTC_MIN_REG_ADDR 0x1
#define RTC_HR_REG_ADDR 0x2
#define RTC_DAY_REG_ADDR 0x3
#define RTC_DATE_REG_ADDR 0x4
#define RTC_MON_REG_ADDR 0x5
#define RTC_YR_REG_ADDR 0x6
#define RTC_CTL_REG_ADDR 0x0e
#define RTC_STAT_REG_ADDR 0x0f
/*
* RTC control register bits
*/
#define RTC_CTL_BIT_A1IE 0x1 /* Alarm 1 interrupt enable */
#define RTC_CTL_BIT_A2IE 0x2 /* Alarm 2 interrupt enable */
#define RTC_CTL_BIT_INTCN 0x4 /* Interrupt control */
#define RTC_CTL_BIT_RS1 0x8 /* Rate select 1 */
#define RTC_CTL_BIT_RS2 0x10 /* Rate select 2 */
#define RTC_CTL_BIT_DOSC 0x80 /* Disable Oscillator */
/*
* RTC status register bits
*/
#define RTC_STAT_BIT_A1F 0x1 /* Alarm 1 flag */
#define RTC_STAT_BIT_A2F 0x2 /* Alarm 2 flag */
#define RTC_STAT_BIT_OSF 0x80 /* Oscillator stop flag */
#define RTC_STAT_BIT_BB32KHZ 0x40 /* Battery backed 32KHz Output */
#define RTC_STAT_BIT_EN32KHZ 0x8 /* Enable 32KHz Output */
#if !CONFIG_IS_ENABLED(DM_RTC)
static uchar rtc_read (uchar reg);
static void rtc_write (uchar reg, uchar val);
/*
* Get the current time from the RTC
*/
int rtc_get (struct rtc_time *tmp)
{
int rel = 0;
uchar sec, min, hour, mday, wday, mon_cent, year, control, status;
control = rtc_read (RTC_CTL_REG_ADDR);
status = rtc_read (RTC_STAT_REG_ADDR);
sec = rtc_read (RTC_SEC_REG_ADDR);
min = rtc_read (RTC_MIN_REG_ADDR);
hour = rtc_read (RTC_HR_REG_ADDR);
wday = rtc_read (RTC_DAY_REG_ADDR);
mday = rtc_read (RTC_DATE_REG_ADDR);
mon_cent = rtc_read (RTC_MON_REG_ADDR);
year = rtc_read (RTC_YR_REG_ADDR);
debug("Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x "
"hr: %02x min: %02x sec: %02x control: %02x status: %02x\n",
year, mon_cent, mday, wday, hour, min, sec, control, status);
if (status & RTC_STAT_BIT_OSF) {
printf ("### Warning: RTC oscillator has stopped\n");
/* clear the OSF flag */
rtc_write (RTC_STAT_REG_ADDR,
rtc_read (RTC_STAT_REG_ADDR) & ~RTC_STAT_BIT_OSF);
rel = -1;
}
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_cent & 0x1F);
tmp->tm_year = bcd2bin (year) + ((mon_cent & 0x80) ? 2000 : 1900);
tmp->tm_wday = bcd2bin ((wday - 1) & 0x07);
tmp->tm_yday = 0;
tmp->tm_isdst= 0;
debug("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);
return rel;
}
/*
* Set the RTC
*/
int rtc_set (struct rtc_time *tmp)
{
uchar century;
debug("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);
rtc_write (RTC_YR_REG_ADDR, bin2bcd (tmp->tm_year % 100));
century = (tmp->tm_year >= 2000) ? 0x80 : 0;
rtc_write (RTC_MON_REG_ADDR, bin2bcd (tmp->tm_mon) | century);
rtc_write (RTC_DAY_REG_ADDR, bin2bcd (tmp->tm_wday + 1));
rtc_write (RTC_DATE_REG_ADDR, bin2bcd (tmp->tm_mday));
rtc_write (RTC_HR_REG_ADDR, bin2bcd (tmp->tm_hour));
rtc_write (RTC_MIN_REG_ADDR, bin2bcd (tmp->tm_min));
rtc_write (RTC_SEC_REG_ADDR, bin2bcd (tmp->tm_sec));
return 0;
}
/*
* Reset the RTC. We also enable the oscillator output on the
* SQW/INTB* pin and program it for 32,768 Hz output. Note that
* according to the datasheet, turning on the square wave output
* increases the current drain on the backup battery from about
* 600 nA to 2uA.
*/
void rtc_reset (void)
{
rtc_write (RTC_CTL_REG_ADDR, RTC_CTL_BIT_RS1 | RTC_CTL_BIT_RS2);
}
/*
* Enable 32KHz output
*/
#ifdef CONFIG_RTC_ENABLE_32KHZ_OUTPUT
void rtc_enable_32khz_output(void)
{
rtc_write(RTC_STAT_REG_ADDR,
RTC_STAT_BIT_BB32KHZ | RTC_STAT_BIT_EN32KHZ);
}
#endif
/*
* Helper functions
*/
static
uchar rtc_read (uchar reg)
{
return (i2c_reg_read (CFG_SYS_I2C_RTC_ADDR, reg));
}
static void rtc_write (uchar reg, uchar val)
{
i2c_reg_write (CFG_SYS_I2C_RTC_ADDR, reg, val);
}
#else
static int ds3231_rtc_get(struct udevice *dev, struct rtc_time *tmp)
{
uchar sec, min, hour, mday, wday, mon_cent, year, status;
status = dm_i2c_reg_read(dev, RTC_STAT_REG_ADDR);
sec = dm_i2c_reg_read(dev, RTC_SEC_REG_ADDR);
min = dm_i2c_reg_read(dev, RTC_MIN_REG_ADDR);
hour = dm_i2c_reg_read(dev, RTC_HR_REG_ADDR);
wday = dm_i2c_reg_read(dev, RTC_DAY_REG_ADDR);
mday = dm_i2c_reg_read(dev, RTC_DATE_REG_ADDR);
mon_cent = dm_i2c_reg_read(dev, RTC_MON_REG_ADDR);
year = dm_i2c_reg_read(dev, RTC_YR_REG_ADDR);
if (status & RTC_STAT_BIT_OSF) {
printf("### Warning: RTC oscillator has stopped\n");
/* clear the OSF flag */
dm_i2c_reg_write(dev, RTC_STAT_REG_ADDR,
dm_i2c_reg_read(dev, RTC_STAT_REG_ADDR)
& ~RTC_STAT_BIT_OSF);
return -EINVAL;
}
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_cent & 0x1F);
tmp->tm_year = bcd2bin(year) + ((mon_cent & 0x80) ? 2000 : 1900);
tmp->tm_wday = bcd2bin((wday - 1) & 0x07);
tmp->tm_yday = 0;
tmp->tm_isdst = 0;
debug("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);
return 0;
}
static int ds3231_rtc_set(struct udevice *dev, const struct rtc_time *tmp)
{
uchar century;
debug("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);
dm_i2c_reg_write(dev, RTC_YR_REG_ADDR, bin2bcd(tmp->tm_year % 100));
century = (tmp->tm_year >= 2000) ? 0x80 : 0;
dm_i2c_reg_write(dev, RTC_MON_REG_ADDR, bin2bcd(tmp->tm_mon) | century);
dm_i2c_reg_write(dev, RTC_DAY_REG_ADDR, bin2bcd(tmp->tm_wday + 1));
dm_i2c_reg_write(dev, RTC_DATE_REG_ADDR, bin2bcd(tmp->tm_mday));
dm_i2c_reg_write(dev, RTC_HR_REG_ADDR, bin2bcd(tmp->tm_hour));
dm_i2c_reg_write(dev, RTC_MIN_REG_ADDR, bin2bcd(tmp->tm_min));
dm_i2c_reg_write(dev, RTC_SEC_REG_ADDR, bin2bcd(tmp->tm_sec));
return 0;
}
static int ds3231_rtc_reset(struct udevice *dev)
{
int ret;
ret = dm_i2c_reg_write(dev, RTC_CTL_REG_ADDR,
RTC_CTL_BIT_RS1 | RTC_CTL_BIT_RS2);
if (ret < 0)
return ret;
return 0;
}
static int ds3231_probe(struct udevice *dev)
{
i2c_set_chip_flags(dev, DM_I2C_CHIP_RD_ADDRESS |
DM_I2C_CHIP_WR_ADDRESS);
return 0;
}
#ifdef CONFIG_RTC_ENABLE_32KHZ_OUTPUT
int rtc_enable_32khz_output(int busnum, int chip_addr)
{
int ret;
struct udevice *dev;
ret = i2c_get_chip_for_busnum(busnum, chip_addr, 1, &dev);
if (!ret) {
ret = dm_i2c_reg_write(dev, RTC_STAT_REG_ADDR,
RTC_STAT_BIT_BB32KHZ |
RTC_STAT_BIT_EN32KHZ);
}
return ret;
}
#endif
static const struct rtc_ops ds3231_rtc_ops = {
.get = ds3231_rtc_get,
.set = ds3231_rtc_set,
.reset = ds3231_rtc_reset,
};
static const struct udevice_id ds3231_rtc_ids[] = {
{ .compatible = "dallas,ds3231" },
{ .compatible = "dallas,ds3232" },
{ }
};
U_BOOT_DRIVER(rtc_ds3231) = {
.name = "rtc-ds3231",
.id = UCLASS_RTC,
.probe = ds3231_probe,
.of_match = ds3231_rtc_ids,
.ops = &ds3231_rtc_ops,
};
#endif
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