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u-boot/drivers/rtc/rx8010sj.c
Robert Beckett fff7b33ce5 rtc: rx8010js: add compatible string 
Add compatible string used by Linux.
Allows for simpler syncing of device trees.

Signed-off-by: Robert Beckett <bob.beckett@collabora.com>
2019-12-27 14:34:29 +01:00

380 lines
8.1 KiB
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/*
* Epson RX8010 RTC driver.
*
* Copyright (c) 2017, General Electric Company
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <command.h>
#include <common.h>
#include <dm.h>
#include <i2c.h>
#include <rtc.h>
/*---------------------------------------------------------------------*/
/* #undef DEBUG_RTC */
#ifdef DEBUG_RTC
#define DEBUGR(fmt, args...) printf(fmt, ##args)
#else
#define DEBUGR(fmt, args...)
#endif
/*---------------------------------------------------------------------*/
#ifndef CONFIG_SYS_I2C_RTC_ADDR
# define CONFIG_SYS_I2C_RTC_ADDR 0x32
#endif
/*
* RTC register addresses
*/
#define RX8010_SEC 0x10
#define RX8010_MIN 0x11
#define RX8010_HOUR 0x12
#define RX8010_WDAY 0x13
#define RX8010_MDAY 0x14
#define RX8010_MONTH 0x15
#define RX8010_YEAR 0x16
#define RX8010_YEAR 0x16
#define RX8010_RESV17 0x17
#define RX8010_ALMIN 0x18
#define RX8010_ALHOUR 0x19
#define RX8010_ALWDAY 0x1A
#define RX8010_TCOUNT0 0x1B
#define RX8010_TCOUNT1 0x1C
#define RX8010_EXT 0x1D
#define RX8010_FLAG 0x1E
#define RX8010_CTRL 0x1F
/* 0x20 to 0x2F are user registers */
#define RX8010_RESV30 0x30
#define RX8010_RESV31 0x32
#define RX8010_IRQ 0x32
#define RX8010_EXT_WADA BIT(3)
#define RX8010_FLAG_VLF BIT(1)
#define RX8010_FLAG_AF BIT(3)
#define RX8010_FLAG_TF BIT(4)
#define RX8010_FLAG_UF BIT(5)
#define RX8010_CTRL_AIE BIT(3)
#define RX8010_CTRL_UIE BIT(5)
#define RX8010_CTRL_STOP BIT(6)
#define RX8010_CTRL_TEST BIT(7)
#define RX8010_ALARM_AE BIT(7)
#ifdef CONFIG_DM_RTC
#define DEV_TYPE struct udevice
#else
/* Local udevice */
struct ludevice {
u8 chip;
};
#define DEV_TYPE struct ludevice
#endif
static int rx8010sj_rtc_read8(DEV_TYPE *dev, unsigned int reg)
{
u8 val;
int ret;
#ifdef CONFIG_DM_RTC
ret = dm_i2c_read(dev, reg, &val, sizeof(val));
#else
ret = i2c_read(dev->chip, reg, 1, &val, 1);
#endif
return ret < 0 ? ret : val;
}
static int rx8010sj_rtc_write8(DEV_TYPE *dev, unsigned int reg, int val)
{
int ret;
u8 lval = val;
#ifdef CONFIG_DM_RTC
ret = dm_i2c_write(dev, reg, &lval, 1);
#else
ret = i2c_write(dev->chip, reg, 1, &lval, 1);
#endif
return ret < 0 ? ret : 0;
}
static int validate_time(const struct rtc_time *tm)
{
if ((tm->tm_year < 2000) || (tm->tm_year > 2099))
return -EINVAL;
if ((tm->tm_mon < 1) || (tm->tm_mon > 12))
return -EINVAL;
if ((tm->tm_mday < 1) || (tm->tm_mday > 31))
return -EINVAL;
if ((tm->tm_wday < 0) || (tm->tm_wday > 6))
return -EINVAL;
if ((tm->tm_hour < 0) || (tm->tm_hour > 23))
return -EINVAL;
if ((tm->tm_min < 0) || (tm->tm_min > 59))
return -EINVAL;
if ((tm->tm_sec < 0) || (tm->tm_sec > 59))
return -EINVAL;
return 0;
}
void rx8010sj_rtc_init(DEV_TYPE *dev)
{
u8 ctrl[2];
int need_clear = 0, ret = 0;
/* Initialize reserved registers as specified in datasheet */
ret = rx8010sj_rtc_write8(dev, RX8010_RESV17, 0xD8);
if (ret < 0)
goto error;
ret = rx8010sj_rtc_write8(dev, RX8010_RESV30, 0x00);
if (ret < 0)
goto error;
ret = rx8010sj_rtc_write8(dev, RX8010_RESV31, 0x08);
if (ret < 0)
goto error;
ret = rx8010sj_rtc_write8(dev, RX8010_IRQ, 0x00);
if (ret < 0)
goto error;
for (int i = 0; i < 2; i++) {
ret = rx8010sj_rtc_read8(dev, RX8010_FLAG + i);
if (ret < 0)
goto error;
ctrl[i] = ret;
}
if (ctrl[0] & RX8010_FLAG_VLF)
printf("RTC low voltage detected\n");
if (ctrl[0] & RX8010_FLAG_AF) {
printf("Alarm was detected\n");
need_clear = 1;
}
if (ctrl[0] & RX8010_FLAG_TF)
need_clear = 1;
if (ctrl[0] & RX8010_FLAG_UF)
need_clear = 1;
if (need_clear) {
ctrl[0] &= ~(RX8010_FLAG_AF | RX8010_FLAG_TF | RX8010_FLAG_UF);
ret = rx8010sj_rtc_write8(dev, RX8010_FLAG, ctrl[0]);
if (ret < 0)
goto error;
}
return;
error:
printf("Error rtc init.\n");
}
/* Get the current time from the RTC */
static int rx8010sj_rtc_get(DEV_TYPE *dev, struct rtc_time *tmp)
{
u8 date[7];
int flagreg;
int ret;
flagreg = rx8010sj_rtc_read8(dev, RX8010_FLAG);
if (flagreg < 0) {
DEBUGR("Error reading from RTC. err: %d\n", flagreg);
return -EIO;
}
if (flagreg & RX8010_FLAG_VLF) {
DEBUGR("RTC low voltage detected\n");
return -EINVAL;
}
for (int i = 0; i < 7; i++) {
ret = rx8010sj_rtc_read8(dev, RX8010_SEC + i);
if (ret < 0) {
DEBUGR("Error reading from RTC. err: %d\n", ret);
return -EIO;
}
date[i] = ret;
}
tmp->tm_sec = bcd2bin(date[RX8010_SEC - RX8010_SEC] & 0x7f);
tmp->tm_min = bcd2bin(date[RX8010_MIN - RX8010_SEC] & 0x7f);
tmp->tm_hour = bcd2bin(date[RX8010_HOUR - RX8010_SEC] & 0x3f);
tmp->tm_mday = bcd2bin(date[RX8010_MDAY - RX8010_SEC] & 0x3f);
tmp->tm_mon = bcd2bin(date[RX8010_MONTH - RX8010_SEC] & 0x1f);
tmp->tm_year = bcd2bin(date[RX8010_YEAR - RX8010_SEC]) + 2000;
tmp->tm_wday = 0;
tmp->tm_yday = 0;
tmp->tm_isdst = 0;
DEBUGR("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;
}
/* Set the RTC */
static int rx8010sj_rtc_set(DEV_TYPE *dev, const struct rtc_time *tm)
{
u8 date[7];
int ctrl, flagreg;
int ret;
ret = validate_time(tm);
if (ret < 0)
return -EINVAL;
/* set STOP bit before changing clock/calendar */
ctrl = rx8010sj_rtc_read8(dev, RX8010_CTRL);
if (ctrl < 0)
return ctrl;
ret = rx8010sj_rtc_write8(dev, RX8010_CTRL, ctrl | RX8010_CTRL_STOP);
if (ret < 0)
return ret;
date[RX8010_SEC - RX8010_SEC] = bin2bcd(tm->tm_sec);
date[RX8010_MIN - RX8010_SEC] = bin2bcd(tm->tm_min);
date[RX8010_HOUR - RX8010_SEC] = bin2bcd(tm->tm_hour);
date[RX8010_MDAY - RX8010_SEC] = bin2bcd(tm->tm_mday);
date[RX8010_MONTH - RX8010_SEC] = bin2bcd(tm->tm_mon);
date[RX8010_YEAR - RX8010_SEC] = bin2bcd(tm->tm_year - 2000);
date[RX8010_WDAY - RX8010_SEC] = bin2bcd(tm->tm_wday);
for (int i = 0; i < 7; i++) {
ret = rx8010sj_rtc_write8(dev, RX8010_SEC + i, date[i]);
if (ret < 0) {
DEBUGR("Error writing to RTC. err: %d\n", ret);
return -EIO;
}
}
/* clear STOP bit after changing clock/calendar */
ctrl = rx8010sj_rtc_read8(dev, RX8010_CTRL);
if (ctrl < 0)
return ctrl;
ret = rx8010sj_rtc_write8(dev, RX8010_CTRL, ctrl & ~RX8010_CTRL_STOP);
if (ret < 0)
return ret;
flagreg = rx8010sj_rtc_read8(dev, RX8010_FLAG);
if (flagreg < 0)
return flagreg;
if (flagreg & RX8010_FLAG_VLF)
ret = rx8010sj_rtc_write8(dev, RX8010_FLAG,
flagreg & ~RX8010_FLAG_VLF);
return 0;
}
/* Reset the RTC. */
static int rx8010sj_rtc_reset(DEV_TYPE *dev)
{
/* Not needed */
return 0;
}
#ifndef CONFIG_DM_RTC
int rtc_get(struct rtc_time *tm)
{
struct ludevice dev = {
.chip = CONFIG_SYS_I2C_RTC_ADDR,
};
return rx8010sj_rtc_get(&dev, tm);
}
int rtc_set(struct rtc_time *tm)
{
struct ludevice dev = {
.chip = CONFIG_SYS_I2C_RTC_ADDR,
};
return rx8010sj_rtc_set(&dev, tm);
}
void rtc_reset(void)
{
struct ludevice dev = {
.chip = CONFIG_SYS_I2C_RTC_ADDR,
};
rx8010sj_rtc_reset(&dev);
}
void rtc_init(void)
{
struct ludevice dev = {
.chip = CONFIG_SYS_I2C_RTC_ADDR,
};
rx8010sj_rtc_init(&dev);
}
#else
static int rx8010sj_probe(struct udevice *dev)
{
rx8010sj_rtc_init(dev);
return 0;
}
static const struct rtc_ops rx8010sj_rtc_ops = {
.get = rx8010sj_rtc_get,
.set = rx8010sj_rtc_set,
.read8 = rx8010sj_rtc_read8,
.write8 = rx8010sj_rtc_write8,
.reset = rx8010sj_rtc_reset,
};
static const struct udevice_id rx8010sj_rtc_ids[] = {
{ .compatible = "epson,rx8010sj-rtc" },
{ .compatible = "epson,rx8010" },
{ }
};
U_BOOT_DRIVER(rx8010sj_rtc) = {
.name = "rx8010sj_rtc",
.id = UCLASS_RTC,
.probe = rx8010sj_probe,
.of_match = rx8010sj_rtc_ids,
.ops = &rx8010sj_rtc_ops,
};
#endif
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