mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-25 14:10:43 +00:00
cd93d625fd
Move this uncommon header out of the common header. Signed-off-by: Simon Glass <sjg@chromium.org>
276 lines
6.3 KiB
C
276 lines
6.3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* (C) Copyright 2019, Vaisala Oyj
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <command.h>
|
|
#include <dm.h>
|
|
#include <i2c.h>
|
|
#include <rtc.h>
|
|
#include <dm/device_compat.h>
|
|
#include <linux/bitops.h>
|
|
|
|
/*
|
|
* RTC register addresses
|
|
*/
|
|
#define RTC_SEC_REG_ADDR 0x00
|
|
#define RTC_MIN_REG_ADDR 0x01
|
|
#define RTC_HR_REG_ADDR 0x02
|
|
#define RTC_DAY_REG_ADDR 0x03
|
|
#define RTC_DATE_REG_ADDR 0x04
|
|
#define RTC_MON_REG_ADDR 0x05
|
|
#define RTC_YR_REG_ADDR 0x06
|
|
#define RTC_CTL_REG_ADDR 0x0e
|
|
#define RTC_STAT_REG_ADDR 0x0f
|
|
#define RTC_TEST_REG_ADDR 0x13
|
|
|
|
/*
|
|
* RTC control register bits
|
|
*/
|
|
#define RTC_CTL_BIT_A1IE BIT(0) /* Alarm 1 interrupt enable */
|
|
#define RTC_CTL_BIT_A2IE BIT(1) /* Alarm 2 interrupt enable */
|
|
#define RTC_CTL_BIT_INTCN BIT(2) /* Interrupt control */
|
|
#define RTC_CTL_BIT_DOSC BIT(7) /* Disable Oscillator */
|
|
|
|
/*
|
|
* RTC status register bits
|
|
*/
|
|
#define RTC_STAT_BIT_A1F BIT(0) /* Alarm 1 flag */
|
|
#define RTC_STAT_BIT_A2F BIT(1) /* Alarm 2 flag */
|
|
#define RTC_STAT_BIT_EN32KHZ BIT(3) /* Enable 32KHz Output */
|
|
#define RTC_STAT_BIT_BB32KHZ BIT(6) /* Battery backed 32KHz Output */
|
|
#define RTC_STAT_BIT_OSF BIT(7) /* Oscillator stop flag */
|
|
|
|
/*
|
|
* RTC test register bits
|
|
*/
|
|
#define RTC_TEST_BIT_SWRST BIT(7) /* Software reset */
|
|
|
|
#define RTC_DATE_TIME_REG_SIZE 7
|
|
#define RTC_SRAM_START 0x14
|
|
#define RTC_SRAM_END 0xFF
|
|
#define RTC_SRAM_SIZE 236
|
|
|
|
struct ds3232_priv_data {
|
|
u8 max_register;
|
|
u8 sram_start;
|
|
int sram_size;
|
|
};
|
|
|
|
static int ds3232_rtc_read8(struct udevice *dev, unsigned int reg)
|
|
{
|
|
int ret;
|
|
u8 buf;
|
|
struct ds3232_priv_data *priv_data;
|
|
|
|
priv_data = dev_get_priv(dev);
|
|
if (!priv_data)
|
|
return -EINVAL;
|
|
|
|
if (reg > priv_data->max_register)
|
|
return -EINVAL;
|
|
|
|
ret = dm_i2c_read(dev, reg, &buf, sizeof(buf));
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return buf;
|
|
}
|
|
|
|
static int ds3232_rtc_write8(struct udevice *dev, unsigned int reg, int val)
|
|
{
|
|
u8 buf = (u8)val;
|
|
struct ds3232_priv_data *priv_data;
|
|
|
|
priv_data = dev_get_priv(dev);
|
|
if (!priv_data)
|
|
return -EINVAL;
|
|
|
|
if (reg > priv_data->max_register)
|
|
return -EINVAL;
|
|
|
|
return dm_i2c_write(dev, reg, &buf, sizeof(buf));
|
|
}
|
|
|
|
static int reset_sram(struct udevice *dev)
|
|
{
|
|
int ret, sram_end, reg;
|
|
struct ds3232_priv_data *priv_data;
|
|
|
|
priv_data = dev_get_priv(dev);
|
|
if (!priv_data)
|
|
return -EINVAL;
|
|
|
|
sram_end = priv_data->sram_start + priv_data->sram_size;
|
|
|
|
for (reg = priv_data->sram_start; reg < sram_end; reg++) {
|
|
ret = ds3232_rtc_write8(dev, reg, 0x00);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int verify_osc(struct udevice *dev)
|
|
{
|
|
int ret, rtc_status;
|
|
|
|
ret = ds3232_rtc_read8(dev, RTC_STAT_REG_ADDR);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
rtc_status = ret;
|
|
|
|
if (rtc_status & RTC_STAT_BIT_OSF) {
|
|
dev_warn(dev,
|
|
"oscillator discontinuity flagged, time unreliable\n");
|
|
/*
|
|
* In case OSC was off we cannot trust the SRAM data anymore.
|
|
* Reset it to 0x00.
|
|
*/
|
|
ret = reset_sram(dev);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ds3232_rtc_set(struct udevice *dev, const struct rtc_time *tm)
|
|
{
|
|
u8 buf[RTC_DATE_TIME_REG_SIZE];
|
|
u8 is_century;
|
|
|
|
if (tm->tm_year < 1900 || tm->tm_year > 2099)
|
|
dev_warn(dev, "WARNING: year should be between 1900 and 2099!\n");
|
|
|
|
is_century = (tm->tm_year >= 2000) ? 0x80 : 0;
|
|
|
|
buf[RTC_SEC_REG_ADDR] = bin2bcd(tm->tm_sec);
|
|
buf[RTC_MIN_REG_ADDR] = bin2bcd(tm->tm_min);
|
|
buf[RTC_HR_REG_ADDR] = bin2bcd(tm->tm_hour);
|
|
buf[RTC_DAY_REG_ADDR] = bin2bcd(tm->tm_wday + 1);
|
|
buf[RTC_DATE_REG_ADDR] = bin2bcd(tm->tm_mday);
|
|
buf[RTC_MON_REG_ADDR] = bin2bcd(tm->tm_mon) | is_century;
|
|
buf[RTC_YR_REG_ADDR] = bin2bcd(tm->tm_year % 100);
|
|
|
|
return dm_i2c_write(dev, 0, buf, sizeof(buf));
|
|
}
|
|
|
|
static int ds3232_rtc_get(struct udevice *dev, struct rtc_time *tm)
|
|
{
|
|
int ret;
|
|
u8 buf[RTC_DATE_TIME_REG_SIZE];
|
|
u8 is_twelve_hr;
|
|
u8 is_pm;
|
|
u8 is_century;
|
|
|
|
ret = verify_osc(dev);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = dm_i2c_read(dev, 0, buf, sizeof(buf));
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
/* Extract additional information for AM/PM and century */
|
|
is_twelve_hr = buf[RTC_HR_REG_ADDR] & 0x40;
|
|
is_pm = buf[RTC_HR_REG_ADDR] & 0x20;
|
|
is_century = buf[RTC_MON_REG_ADDR] & 0x80;
|
|
|
|
tm->tm_sec = bcd2bin(buf[RTC_SEC_REG_ADDR] & 0x7F);
|
|
tm->tm_min = bcd2bin(buf[RTC_MIN_REG_ADDR] & 0x7F);
|
|
|
|
if (is_twelve_hr)
|
|
tm->tm_hour = bcd2bin(buf[RTC_HR_REG_ADDR] & 0x1F)
|
|
+ (is_pm ? 12 : 0);
|
|
else
|
|
tm->tm_hour = bcd2bin(buf[RTC_HR_REG_ADDR]);
|
|
|
|
tm->tm_wday = bcd2bin((buf[RTC_DAY_REG_ADDR] & 0x07) - 1);
|
|
tm->tm_mday = bcd2bin(buf[RTC_DATE_REG_ADDR] & 0x3F);
|
|
tm->tm_mon = bcd2bin((buf[RTC_MON_REG_ADDR] & 0x7F));
|
|
tm->tm_year = bcd2bin(buf[RTC_YR_REG_ADDR])
|
|
+ (is_century ? 2000 : 1900);
|
|
tm->tm_yday = 0;
|
|
tm->tm_isdst = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ds3232_rtc_reset(struct udevice *dev)
|
|
{
|
|
int ret;
|
|
|
|
ret = reset_sram(dev);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
/*
|
|
* From datasheet
|
|
* (https://datasheets.maximintegrated.com/en/ds/DS3232M.pdf):
|
|
*
|
|
* The device reset occurs during the normal acknowledge time slot
|
|
* following the receipt of the data byte carrying that
|
|
* SWRST instruction a NACK occurs due to the resetting action.
|
|
*
|
|
* Therefore we don't verify the result of I2C write operation since it
|
|
* will fail due the NACK.
|
|
*/
|
|
ds3232_rtc_write8(dev, RTC_TEST_REG_ADDR, RTC_TEST_BIT_SWRST);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ds3232_probe(struct udevice *dev)
|
|
{
|
|
int rtc_status;
|
|
int ret;
|
|
struct ds3232_priv_data *priv_data;
|
|
|
|
priv_data = dev_get_priv(dev);
|
|
if (!priv_data)
|
|
return -EINVAL;
|
|
|
|
priv_data->sram_start = RTC_SRAM_START;
|
|
priv_data->max_register = RTC_SRAM_END;
|
|
priv_data->sram_size = RTC_SRAM_SIZE;
|
|
|
|
ret = ds3232_rtc_read8(dev, RTC_STAT_REG_ADDR);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
rtc_status = ret;
|
|
|
|
ret = verify_osc(dev);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
rtc_status &= ~(RTC_STAT_BIT_OSF | RTC_STAT_BIT_A1F | RTC_STAT_BIT_A2F);
|
|
|
|
return ds3232_rtc_write8(dev, RTC_STAT_REG_ADDR, rtc_status);
|
|
}
|
|
|
|
static const struct rtc_ops ds3232_rtc_ops = {
|
|
.get = ds3232_rtc_get,
|
|
.set = ds3232_rtc_set,
|
|
.reset = ds3232_rtc_reset,
|
|
.read8 = ds3232_rtc_read8,
|
|
.write8 = ds3232_rtc_write8
|
|
};
|
|
|
|
static const struct udevice_id ds3232_rtc_ids[] = {
|
|
{ .compatible = "dallas,ds3232" },
|
|
{ }
|
|
};
|
|
|
|
U_BOOT_DRIVER(rtc_ds3232) = {
|
|
.name = "rtc-ds3232",
|
|
.id = UCLASS_RTC,
|
|
.probe = ds3232_probe,
|
|
.of_match = ds3232_rtc_ids,
|
|
.ops = &ds3232_rtc_ops,
|
|
.priv_auto_alloc_size = sizeof(struct ds3232_priv_data),
|
|
};
|