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u-boot/drivers/rtc/pcf8563.c

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SPDX: Convert all of our single license tags to Linux Kernel style When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-06 21:58:06 +00:00
// SPDX-License-Identifier: GPL-2.0+
Initial revision
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/*
* (C) Copyright 2001
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*/
/*
* Date & Time support for Philips PCF8563 RTC
*/
/* #define DEBUG */
#include <common.h>
#include <command.h>
rtc: pcf8563: Add driver model support Add support of driver model of pcf8563 Signed-off-by: Biwen Li <biwen.li@nxp.com> Signed-off-by: Priyanka Jain <priyanka.jain@nxp.com>
2019-12-31 07:33:37 +00:00
#include <dm.h>
Initial revision
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#include <rtc.h>
#include <i2c.h>
rtc: pcf8563: Add driver model support Add support of driver model of pcf8563 Signed-off-by: Biwen Li <biwen.li@nxp.com> Signed-off-by: Priyanka Jain <priyanka.jain@nxp.com>
2019-12-31 07:33:37 +00:00
#if !CONFIG_IS_ENABLED(DM_RTC)
Initial revision
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static uchar rtc_read (uchar reg);
static void rtc_write (uchar reg, uchar val);
/* ------------------------------------------------------------------------- */
LWMON5: POST RTC fix Modify the RTC API to provide one a status for the time reported by the rtc_get() function: 0 - a reliable time is guaranteed, < 0 - a reliable time isn't guaranteed (power fault, clock issues, and so on). The RTC chip drivers are responsible for providing this info if the corresponding chip supports such functionality. If not - always report that the time is reliable. The POST RTC test was modified to detect the RTC faults utilizing this new rtc_get() feature. Signed-off-by: Yuri Tikhonov <yur@emcraft.com>
2008-03-20 14:56:04 +00:00
int rtc_get (struct rtc_time *tmp)
Initial revision
2002-11-03 00:38:21 +00:00
{
LWMON5: POST RTC fix Modify the RTC API to provide one a status for the time reported by the rtc_get() function: 0 - a reliable time is guaranteed, < 0 - a reliable time isn't guaranteed (power fault, clock issues, and so on). The RTC chip drivers are responsible for providing this info if the corresponding chip supports such functionality. If not - always report that the time is reliable. The POST RTC test was modified to detect the RTC faults utilizing this new rtc_get() feature. Signed-off-by: Yuri Tikhonov <yur@emcraft.com>
2008-03-20 14:56:04 +00:00
int rel = 0;
Initial revision
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uchar sec, min, hour, mday, wday, mon_cent, year;
sec = rtc_read (0x02);
min = rtc_read (0x03);
hour = rtc_read (0x04);
mday = rtc_read (0x05);
wday = rtc_read (0x06);
mon_cent= rtc_read (0x07);
year = rtc_read (0x08);
debug ( "Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x "
"hr: %02x min: %02x sec: %02x\n",
year, mon_cent, mday, wday,
hour, min, sec );
debug ( "Alarms: wday: %02x day: %02x hour: %02x min: %02x\n",
rtc_read (0x0C),
rtc_read (0x0B),
rtc_read (0x0A),
rtc_read (0x09) );
if (sec & 0x80) {
* Patches by Thomas Viehweger, 16 Mar 2004: - show PCI clock frequency on MPC8260 systems - add FCC_PSMR_RMII flag for HiP7 processors - in do_jffs2_fsload(), take load address from load_addr if not set explicit, update load_addr otherwise - replaced printf by putc/puts when no formatting is needed (smaller code size, faster execution)
2004-03-23 22:14:11 +00:00
puts ("### Warning: RTC Low Voltage - date/time not reliable\n");
LWMON5: POST RTC fix Modify the RTC API to provide one a status for the time reported by the rtc_get() function: 0 - a reliable time is guaranteed, < 0 - a reliable time isn't guaranteed (power fault, clock issues, and so on). The RTC chip drivers are responsible for providing this info if the corresponding chip supports such functionality. If not - always report that the time is reliable. The POST RTC test was modified to detect the RTC faults utilizing this new rtc_get() feature. Signed-off-by: Yuri Tikhonov <yur@emcraft.com>
2008-03-20 14:56:04 +00:00
rel = -1;
Initial revision
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}
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);
rtc: pcf8563: Make century compatible with Linux This driver uses the century bit of this RTC in the opposite way Linux does. From Linux's rtc-pcf8563.c: /* * The meaning of MO_C bit varies by the chip type. * From PCF8563 datasheet: this bit is toggled when the years * register overflows from 99 to 00 * 0 indicates the century is 20xx * 1 indicates the century is 19xx * From RTC8564 datasheet: this bit indicates change of * century. When the year digit data overflows from 99 to 00, * this bit is set. By presetting it to 0 while still in the * 20th century, it will be set in year 2000, ... * There seems no reliable way to know how the system use this * bit. So let's do it heuristically, assuming we are live in * 1970...2069. */ As U-Boot's PCF8563 driver does not say it is supposed to support the RTC8564, make this driver compatible with Linux's by giving the opposite meaning to the century bit. Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com> Cc: Wolfgang Denk <wd@denx.de>
2012-07-20 14:05:36 +00:00
tmp->tm_year = bcd2bin (year) + ((mon_cent & 0x80) ? 1900 : 2000);
Initial revision
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tmp->tm_wday = bcd2bin (wday & 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);
LWMON5: POST RTC fix Modify the RTC API to provide one a status for the time reported by the rtc_get() function: 0 - a reliable time is guaranteed, < 0 - a reliable time isn't guaranteed (power fault, clock issues, and so on). The RTC chip drivers are responsible for providing this info if the corresponding chip supports such functionality. If not - always report that the time is reliable. The POST RTC test was modified to detect the RTC faults utilizing this new rtc_get() feature. Signed-off-by: Yuri Tikhonov <yur@emcraft.com>
2008-03-20 14:56:04 +00:00
return rel;
Initial revision
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}
rtc: allow rtc_set to return an error and use it in cmd_date Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
2008-09-01 21:06:23 +00:00
int rtc_set (struct rtc_time *tmp)
Initial revision
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{
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 (0x08, bin2bcd(tmp->tm_year % 100));
rtc: pcf8563: Make century compatible with Linux This driver uses the century bit of this RTC in the opposite way Linux does. From Linux's rtc-pcf8563.c: /* * The meaning of MO_C bit varies by the chip type. * From PCF8563 datasheet: this bit is toggled when the years * register overflows from 99 to 00 * 0 indicates the century is 20xx * 1 indicates the century is 19xx * From RTC8564 datasheet: this bit indicates change of * century. When the year digit data overflows from 99 to 00, * this bit is set. By presetting it to 0 while still in the * 20th century, it will be set in year 2000, ... * There seems no reliable way to know how the system use this * bit. So let's do it heuristically, assuming we are live in * 1970...2069. */ As U-Boot's PCF8563 driver does not say it is supposed to support the RTC8564, make this driver compatible with Linux's by giving the opposite meaning to the century bit. Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com> Cc: Wolfgang Denk <wd@denx.de>
2012-07-20 14:05:36 +00:00
century = (tmp->tm_year >= 2000) ? 0 : 0x80;
Initial revision
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rtc_write (0x07, bin2bcd(tmp->tm_mon) | century);
rtc_write (0x06, bin2bcd(tmp->tm_wday));
rtc_write (0x05, bin2bcd(tmp->tm_mday));
rtc_write (0x04, bin2bcd(tmp->tm_hour));
rtc_write (0x03, bin2bcd(tmp->tm_min ));
rtc_write (0x02, bin2bcd(tmp->tm_sec ));
rtc: allow rtc_set to return an error and use it in cmd_date Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
2008-09-01 21:06:23 +00:00
return 0;
Initial revision
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}
void rtc_reset (void)
{
/* clear all control & status registers */
rtc_write (0x00, 0x00);
rtc_write (0x01, 0x00);
rtc_write (0x0D, 0x00);
/* clear Voltage Low bit */
rtc_write (0x02, rtc_read (0x02) & 0x7F);
/* reset all alarms */
rtc_write (0x09, 0x00);
rtc_write (0x0A, 0x00);
rtc_write (0x0B, 0x00);
rtc_write (0x0C, 0x00);
}
/* ------------------------------------------------------------------------- */
static uchar rtc_read (uchar reg)
{
rename CFG_ macros to CONFIG_SYS Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
2008-10-16 13:01:15 +00:00
return (i2c_reg_read (CONFIG_SYS_I2C_RTC_ADDR, reg));
Initial revision
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}
static void rtc_write (uchar reg, uchar val)
{
rename CFG_ macros to CONFIG_SYS Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
2008-10-16 13:01:15 +00:00
i2c_reg_write (CONFIG_SYS_I2C_RTC_ADDR, reg, val);
Initial revision
2002-11-03 00:38:21 +00:00
}
rtc: pcf8563: Add driver model support Add support of driver model of pcf8563 Signed-off-by: Biwen Li <biwen.li@nxp.com> Signed-off-by: Priyanka Jain <priyanka.jain@nxp.com>
2019-12-31 07:33:37 +00:00
#else
static int pcf8563_rtc_get(struct udevice *dev, struct rtc_time *tmp)
{
int rel = 0;
uchar sec, min, hour, mday, wday, mon_cent, year;
sec = dm_i2c_reg_read(dev, 0x02);
min = dm_i2c_reg_read(dev, 0x03);
hour = dm_i2c_reg_read(dev, 0x04);
mday = dm_i2c_reg_read(dev, 0x05);
wday = dm_i2c_reg_read(dev, 0x06);
mon_cent = dm_i2c_reg_read(dev, 0x07);
year = dm_i2c_reg_read(dev, 0x08);
debug("Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x ",
year, mon_cent, mday, wday);
debug("hr: %02x min: %02x sec: %02x\n",
hour, min, sec);
debug("Alarms: wday: %02x day: %02x hour: %02x min: %02x\n",
dm_i2c_reg_read(dev, 0x0C),
dm_i2c_reg_read(dev, 0x0B),
dm_i2c_reg_read(dev, 0x0A),
dm_i2c_reg_read(dev, 0x09));
if (sec & 0x80) {
puts("### Warning: RTC Low Voltage - date/time not reliable\n");
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) ? 1900 : 2000);
tmp->tm_wday = bcd2bin(wday & 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;
}
static int pcf8563_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, 0x08, bin2bcd(tmp->tm_year % 100));
century = (tmp->tm_year >= 2000) ? 0 : 0x80;
dm_i2c_reg_write(dev, 0x07, bin2bcd(tmp->tm_mon) | century);
dm_i2c_reg_write(dev, 0x06, bin2bcd(tmp->tm_wday));
dm_i2c_reg_write(dev, 0x05, bin2bcd(tmp->tm_mday));
dm_i2c_reg_write(dev, 0x04, bin2bcd(tmp->tm_hour));
dm_i2c_reg_write(dev, 0x03, bin2bcd(tmp->tm_min));
dm_i2c_reg_write(dev, 0x02, bin2bcd(tmp->tm_sec));
return 0;
}
static int pcf8563_rtc_reset(struct udevice *dev)
{
/* clear all control & status registers */
dm_i2c_reg_write(dev, 0x00, 0x00);
dm_i2c_reg_write(dev, 0x01, 0x00);
dm_i2c_reg_write(dev, 0x0D, 0x00);
/* clear Voltage Low bit */
dm_i2c_reg_write(dev, 0x02, dm_i2c_reg_read(dev, 0x02) & 0x7F);
/* reset all alarms */
dm_i2c_reg_write(dev, 0x09, 0x00);
dm_i2c_reg_write(dev, 0x0A, 0x00);
dm_i2c_reg_write(dev, 0x0B, 0x00);
dm_i2c_reg_write(dev, 0x0C, 0x00);
return 0;
}
static const struct rtc_ops pcf8563_rtc_ops = {
.get = pcf8563_rtc_get,
.set = pcf8563_rtc_set,
.reset = pcf8563_rtc_reset,
};
static const struct udevice_id pcf8563_rtc_ids[] = {
{ .compatible = "nxp,pcf8563" },
{ }
};
U_BOOT_DRIVER(rtc_pcf8563) = {
.name = "rtc-pcf8563",
.id = UCLASS_RTC,
.of_match = pcf8563_rtc_ids,
.ops = &pcf8563_rtc_ops,
};
#endif
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