mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-06 21:24:29 +00:00
29f965a7ec
Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Heiko Schocher <hs@denx.de> Signed-off-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk>
132 lines
3.1 KiB
C
132 lines
3.1 KiB
C
/*
|
|
* Copyright (C) 2016 by NXP Semiconductors Inc.
|
|
* Date & Time support for PCF2127 RTC
|
|
*/
|
|
|
|
/* #define DEBUG */
|
|
|
|
#include <common.h>
|
|
#include <command.h>
|
|
#include <dm.h>
|
|
#include <i2c.h>
|
|
#include <log.h>
|
|
#include <rtc.h>
|
|
|
|
#define PCF2127_REG_CTRL1 0x00
|
|
#define PCF2127_REG_CTRL2 0x01
|
|
#define PCF2127_REG_CTRL3 0x02
|
|
#define PCF2127_REG_SC 0x03
|
|
#define PCF2127_REG_MN 0x04
|
|
#define PCF2127_REG_HR 0x05
|
|
#define PCF2127_REG_DM 0x06
|
|
#define PCF2127_REG_DW 0x07
|
|
#define PCF2127_REG_MO 0x08
|
|
#define PCF2127_REG_YR 0x09
|
|
|
|
static int pcf2127_rtc_read(struct udevice *dev, uint offset, u8 *buffer, uint len)
|
|
{
|
|
struct dm_i2c_chip *chip = dev_get_parent_platdata(dev);
|
|
struct i2c_msg msg;
|
|
int ret;
|
|
|
|
/* Set the address of the start register to be read */
|
|
ret = dm_i2c_write(dev, offset, NULL, 0);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
/* Read register's data */
|
|
msg.addr = chip->chip_addr;
|
|
msg.flags |= I2C_M_RD;
|
|
msg.len = len;
|
|
msg.buf = buffer;
|
|
|
|
return dm_i2c_xfer(dev, &msg, 1);
|
|
}
|
|
|
|
static int pcf2127_rtc_write(struct udevice *dev, uint offset,
|
|
const u8 *buffer, uint len)
|
|
{
|
|
return dm_i2c_write(dev, offset, buffer, len);
|
|
}
|
|
|
|
static int pcf2127_rtc_set(struct udevice *dev, const struct rtc_time *tm)
|
|
{
|
|
uchar buf[7] = {0};
|
|
int i = 0, ret;
|
|
|
|
/* hours, minutes and seconds */
|
|
buf[i++] = bin2bcd(tm->tm_sec);
|
|
buf[i++] = bin2bcd(tm->tm_min);
|
|
buf[i++] = bin2bcd(tm->tm_hour);
|
|
buf[i++] = bin2bcd(tm->tm_mday);
|
|
buf[i++] = tm->tm_wday & 0x07;
|
|
|
|
/* month, 1 - 12 */
|
|
buf[i++] = bin2bcd(tm->tm_mon);
|
|
|
|
/* year */
|
|
buf[i++] = bin2bcd(tm->tm_year % 100);
|
|
|
|
/* write register's data */
|
|
ret = dm_i2c_write(dev, PCF2127_REG_SC, buf, i);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int pcf2127_rtc_get(struct udevice *dev, struct rtc_time *tm)
|
|
{
|
|
int ret = 0;
|
|
uchar buf[10] = { PCF2127_REG_CTRL1 };
|
|
|
|
ret = pcf2127_rtc_read(dev, PCF2127_REG_CTRL1, buf, sizeof(buf));
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (buf[PCF2127_REG_CTRL3] & 0x04)
|
|
puts("### Warning: RTC Low Voltage - date/time not reliable\n");
|
|
|
|
tm->tm_sec = bcd2bin(buf[PCF2127_REG_SC] & 0x7F);
|
|
tm->tm_min = bcd2bin(buf[PCF2127_REG_MN] & 0x7F);
|
|
tm->tm_hour = bcd2bin(buf[PCF2127_REG_HR] & 0x3F);
|
|
tm->tm_mday = bcd2bin(buf[PCF2127_REG_DM] & 0x3F);
|
|
tm->tm_mon = bcd2bin(buf[PCF2127_REG_MO] & 0x1F);
|
|
tm->tm_year = bcd2bin(buf[PCF2127_REG_YR]) + 1900;
|
|
if (tm->tm_year < 1970)
|
|
tm->tm_year += 100; /* assume we are in 1970...2069 */
|
|
tm->tm_wday = buf[PCF2127_REG_DW] & 0x07;
|
|
tm->tm_yday = 0;
|
|
tm->tm_isdst = 0;
|
|
|
|
debug("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
|
|
tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_wday,
|
|
tm->tm_hour, tm->tm_min, tm->tm_sec);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int pcf2127_rtc_reset(struct udevice *dev)
|
|
{
|
|
/*Doing nothing here*/
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct rtc_ops pcf2127_rtc_ops = {
|
|
.get = pcf2127_rtc_get,
|
|
.set = pcf2127_rtc_set,
|
|
.reset = pcf2127_rtc_reset,
|
|
.read = pcf2127_rtc_read,
|
|
.write = pcf2127_rtc_write,
|
|
};
|
|
|
|
static const struct udevice_id pcf2127_rtc_ids[] = {
|
|
{ .compatible = "pcf2127-rtc" },
|
|
{ }
|
|
};
|
|
|
|
U_BOOT_DRIVER(rtc_pcf2127) = {
|
|
.name = "rtc-pcf2127",
|
|
.id = UCLASS_RTC,
|
|
.of_match = pcf2127_rtc_ids,
|
|
.ops = &pcf2127_rtc_ops,
|
|
};
|