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u-boot-brain/drivers/rtc/ds1306.c
Tom Rini 83d290c56f 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>
2018-05-07 09:34:12 -04:00

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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2002 SIXNET, dge@sixnetio.com.
*
* (C) Copyright 2004, Li-Pro.Net <www.li-pro.net>
* Stephan Linz <linz@li-pro.net>
*/
/*
* Date & Time support for DS1306 RTC using SPI:
*
* - SXNI855T: it uses its own soft SPI here in this file
* - all other: use the external spi_xfer() function
* (see include/spi.h)
*/
#include <common.h>
#include <command.h>
#include <rtc.h>
#include <spi.h>
#if defined(CONFIG_CMD_DATE)
#define RTC_SECONDS 0x00
#define RTC_MINUTES 0x01
#define RTC_HOURS 0x02
#define RTC_DAY_OF_WEEK 0x03
#define RTC_DATE_OF_MONTH 0x04
#define RTC_MONTH 0x05
#define RTC_YEAR 0x06
#define RTC_SECONDS_ALARM0 0x07
#define RTC_MINUTES_ALARM0 0x08
#define RTC_HOURS_ALARM0 0x09
#define RTC_DAY_OF_WEEK_ALARM0 0x0a
#define RTC_SECONDS_ALARM1 0x0b
#define RTC_MINUTES_ALARM1 0x0c
#define RTC_HOURS_ALARM1 0x0d
#define RTC_DAY_OF_WEEK_ALARM1 0x0e
#define RTC_CONTROL 0x0f
#define RTC_STATUS 0x10
#define RTC_TRICKLE_CHARGER 0x11
#define RTC_USER_RAM_BASE 0x20
/* ************************************************************************* */
#ifdef CONFIG_SXNI855T /* !!! SHOULD BE CHANGED TO NEW CODE !!! */
static void soft_spi_send (unsigned char n);
static unsigned char soft_spi_read (void);
static void init_spi (void);
/*-----------------------------------------------------------------------
* Definitions
*/
#define PB_SPISCK 0x00000002 /* PB 30 */
#define PB_SPIMOSI 0x00000004 /* PB 29 */
#define PB_SPIMISO 0x00000008 /* PB 28 */
#define PB_SPI_CE 0x00010000 /* PB 15 */
/* ------------------------------------------------------------------------- */
/* read clock time from DS1306 and return it in *tmp */
int rtc_get (struct rtc_time *tmp)
{
volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;
unsigned char spi_byte; /* Data Byte */
init_spi (); /* set port B for software SPI */
/* Now we can enable the DS1306 RTC */
immap->im_cpm.cp_pbdat |= PB_SPI_CE;
udelay (10);
/* Shift out the address (0) of the time in the Clock Chip */
soft_spi_send (0);
/* Put the clock readings into the rtc_time structure */
tmp->tm_sec = bcd2bin (soft_spi_read ()); /* Read seconds */
tmp->tm_min = bcd2bin (soft_spi_read ()); /* Read minutes */
/* Hours are trickier */
spi_byte = soft_spi_read (); /* Read Hours into temporary value */
if (spi_byte & 0x40) {
/* 12 hour mode bit is set (time is in 1-12 format) */
if (spi_byte & 0x20) {
/* since PM we add 11 to get 0-23 for hours */
tmp->tm_hour = (bcd2bin (spi_byte & 0x1F)) + 11;
} else {
/* since AM we subtract 1 to get 0-23 for hours */
tmp->tm_hour = (bcd2bin (spi_byte & 0x1F)) - 1;
}
} else {
/* Otherwise, 0-23 hour format */
tmp->tm_hour = (bcd2bin (spi_byte & 0x3F));
}
soft_spi_read (); /* Read and discard Day of week */
tmp->tm_mday = bcd2bin (soft_spi_read ()); /* Read Day of the Month */
tmp->tm_mon = bcd2bin (soft_spi_read ()); /* Read Month */
/* Read Year and convert to this century */
tmp->tm_year = bcd2bin (soft_spi_read ()) + 2000;
/* Now we can disable the DS1306 RTC */
immap->im_cpm.cp_pbdat &= ~PB_SPI_CE; /* Disable DS1306 Chip */
udelay (10);
rtc_calc_weekday(tmp); /* Determine the day of week */
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;
}
/* ------------------------------------------------------------------------- */
/* set clock time in DS1306 RTC and in MPC8xx RTC */
int rtc_set (struct rtc_time *tmp)
{
volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;
init_spi (); /* set port B for software SPI */
/* Now we can enable the DS1306 RTC */
immap->im_cpm.cp_pbdat |= PB_SPI_CE; /* Enable DS1306 Chip */
udelay (10);
/* First disable write protect in the clock chip control register */
soft_spi_send (0x8F); /* send address of the control register */
soft_spi_send (0x00); /* send control register contents */
/* Now disable the DS1306 to terminate the write */
immap->im_cpm.cp_pbdat &= ~PB_SPI_CE;
udelay (10);
/* Now enable the DS1306 to initiate a new write */
immap->im_cpm.cp_pbdat |= PB_SPI_CE;
udelay (10);
/* Next, send the address of the clock time write registers */
soft_spi_send (0x80); /* send address of the first time register */
/* Use Burst Mode to send all of the time data to the clock */
bin2bcd (tmp->tm_sec);
soft_spi_send (bin2bcd (tmp->tm_sec)); /* Send Seconds */
soft_spi_send (bin2bcd (tmp->tm_min)); /* Send Minutes */
soft_spi_send (bin2bcd (tmp->tm_hour)); /* Send Hour */
soft_spi_send (bin2bcd (tmp->tm_wday)); /* Send Day of the Week */
soft_spi_send (bin2bcd (tmp->tm_mday)); /* Send Day of Month */
soft_spi_send (bin2bcd (tmp->tm_mon)); /* Send Month */
soft_spi_send (bin2bcd (tmp->tm_year - 2000)); /* Send Year */
/* Now we can disable the Clock chip to terminate the burst write */
immap->im_cpm.cp_pbdat &= ~PB_SPI_CE; /* Disable DS1306 Chip */
udelay (10);
/* Now we can enable the Clock chip to initiate a new write */
immap->im_cpm.cp_pbdat |= PB_SPI_CE; /* Enable DS1306 Chip */
udelay (10);
/* First we Enable write protect in the clock chip control register */
soft_spi_send (0x8F); /* send address of the control register */
soft_spi_send (0x40); /* send out Control Register contents */
/* Now disable the DS1306 */
immap->im_cpm.cp_pbdat &= ~PB_SPI_CE; /* Disable DS1306 Chip */
udelay (10);
/* Set standard MPC8xx clock to the same time so Linux will
* see the time even if it doesn't have a DS1306 clock driver.
* This helps with experimenting with standard kernels.
*/
{
ulong tim;
tim = rtc_mktime(tmp);
immap->im_sitk.sitk_rtck = KAPWR_KEY;
immap->im_sit.sit_rtc = tim;
}
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);
return 0;
}
/* ------------------------------------------------------------------------- */
/* Initialize Port B for software SPI */
static void init_spi (void)
{
volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;
/* Force output pins to begin at logic 0 */
immap->im_cpm.cp_pbdat &= ~(PB_SPI_CE | PB_SPIMOSI | PB_SPISCK);
/* Set these 3 signals as outputs */
immap->im_cpm.cp_pbdir |= (PB_SPIMOSI | PB_SPI_CE | PB_SPISCK);
immap->im_cpm.cp_pbdir &= ~PB_SPIMISO; /* Make MISO pin an input */
udelay (10);
}
/* ------------------------------------------------------------------------- */
/* NOTE: soft_spi_send() assumes that the I/O lines are configured already */
static void soft_spi_send (unsigned char n)
{
volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;
unsigned char bitpos; /* bit position to receive */
unsigned char i; /* Loop Control */
/* bit position to send, start with most significant bit */
bitpos = 0x80;
/* Send 8 bits to software SPI */
for (i = 0; i < 8; i++) { /* Loop for 8 bits */
immap->im_cpm.cp_pbdat |= PB_SPISCK; /* Raise SCK */
if (n & bitpos)
immap->im_cpm.cp_pbdat |= PB_SPIMOSI; /* Set MOSI to 1 */
else
immap->im_cpm.cp_pbdat &= ~PB_SPIMOSI; /* Set MOSI to 0 */
udelay (10);
immap->im_cpm.cp_pbdat &= ~PB_SPISCK; /* Lower SCK */
udelay (10);
bitpos >>= 1; /* Shift for next bit position */
}
}
/* ------------------------------------------------------------------------- */
/* NOTE: soft_spi_read() assumes that the I/O lines are configured already */
static unsigned char soft_spi_read (void)
{
volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;
unsigned char spi_byte = 0; /* Return value, assume success */
unsigned char bitpos; /* bit position to receive */
unsigned char i; /* Loop Control */
/* bit position to receive, start with most significant bit */
bitpos = 0x80;
/* Read 8 bits here */
for (i = 0; i < 8; i++) { /* Do 8 bits in loop */
immap->im_cpm.cp_pbdat |= PB_SPISCK; /* Raise SCK */
udelay (10);
if (immap->im_cpm.cp_pbdat & PB_SPIMISO) /* Get a bit of data */
spi_byte |= bitpos; /* Set data accordingly */
immap->im_cpm.cp_pbdat &= ~PB_SPISCK; /* Lower SCK */
udelay (10);
bitpos >>= 1; /* Shift for next bit position */
}
return spi_byte; /* Return the byte read */
}
/* ------------------------------------------------------------------------- */
void rtc_reset (void)
{
return; /* nothing to do */
}
#else /* not CONFIG_SXNI855T */
/* ************************************************************************* */
static unsigned char rtc_read (unsigned char reg);
static void rtc_write (unsigned char reg, unsigned char val);
static struct spi_slave *slave;
/* read clock time from DS1306 and return it in *tmp */
int rtc_get (struct rtc_time *tmp)
{
unsigned char sec, min, hour, mday, wday, mon, year;
/*
* Assuming Vcc = 2.0V (lowest speed)
*
* REVISIT: If we add an rtc_init() function we can do this
* step just once.
*/
if (!slave) {
slave = spi_setup_slave(0, CONFIG_SYS_SPI_RTC_DEVID, 600000,
SPI_MODE_3 | SPI_CS_HIGH);
if (!slave)
return;
}
if (spi_claim_bus(slave))
return;
sec = rtc_read (RTC_SECONDS);
min = rtc_read (RTC_MINUTES);
hour = rtc_read (RTC_HOURS);
mday = rtc_read (RTC_DATE_OF_MONTH);
wday = rtc_read (RTC_DAY_OF_WEEK);
mon = rtc_read (RTC_MONTH);
year = rtc_read (RTC_YEAR);
spi_release_bus(slave);
debug ("Get RTC year: %02x mon: %02x mday: %02x wday: %02x "
"hr: %02x min: %02x sec: %02x\n",
year, mon, mday, wday, hour, min, sec);
debug ("Alarms[0]: wday: %02x hour: %02x min: %02x sec: %02x\n",
rtc_read (RTC_DAY_OF_WEEK_ALARM0),
rtc_read (RTC_HOURS_ALARM0),
rtc_read (RTC_MINUTES_ALARM0), rtc_read (RTC_SECONDS_ALARM0));
debug ("Alarms[1]: wday: %02x hour: %02x min: %02x sec: %02x\n",
rtc_read (RTC_DAY_OF_WEEK_ALARM1),
rtc_read (RTC_HOURS_ALARM1),
rtc_read (RTC_MINUTES_ALARM1), rtc_read (RTC_SECONDS_ALARM1));
tmp->tm_sec = bcd2bin (sec & 0x7F); /* convert Seconds */
tmp->tm_min = bcd2bin (min & 0x7F); /* convert Minutes */
/* convert Hours */
tmp->tm_hour = (hour & 0x40)
? ((hour & 0x20) /* 12 hour mode */
? bcd2bin (hour & 0x1F) + 11 /* PM */
: bcd2bin (hour & 0x1F) - 1 /* AM */
)
: bcd2bin (hour & 0x3F); /* 24 hour mode */
tmp->tm_mday = bcd2bin (mday & 0x3F); /* convert Day of the Month */
tmp->tm_mon = bcd2bin (mon & 0x1F); /* convert Month */
tmp->tm_year = bcd2bin (year) + 2000; /* convert Year */
tmp->tm_wday = bcd2bin (wday & 0x07) - 1; /* convert Day of the Week */
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;
}
/* ------------------------------------------------------------------------- */
/* set clock time from *tmp in DS1306 RTC */
int rtc_set (struct rtc_time *tmp)
{
/* Assuming Vcc = 2.0V (lowest speed) */
if (!slave) {
slave = spi_setup_slave(0, CONFIG_SYS_SPI_RTC_DEVID, 600000,
SPI_MODE_3 | SPI_CS_HIGH);
if (!slave)
return;
}
if (spi_claim_bus(slave))
return;
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_SECONDS, bin2bcd (tmp->tm_sec));
rtc_write (RTC_MINUTES, bin2bcd (tmp->tm_min));
rtc_write (RTC_HOURS, bin2bcd (tmp->tm_hour));
rtc_write (RTC_DAY_OF_WEEK, bin2bcd (tmp->tm_wday + 1));
rtc_write (RTC_DATE_OF_MONTH, bin2bcd (tmp->tm_mday));
rtc_write (RTC_MONTH, bin2bcd (tmp->tm_mon));
rtc_write (RTC_YEAR, bin2bcd (tmp->tm_year - 2000));
spi_release_bus(slave);
}
/* ------------------------------------------------------------------------- */
/* reset the DS1306 */
void rtc_reset (void)
{
/* Assuming Vcc = 2.0V (lowest speed) */
if (!slave) {
slave = spi_setup_slave(0, CONFIG_SYS_SPI_RTC_DEVID, 600000,
SPI_MODE_3 | SPI_CS_HIGH);
if (!slave)
return;
}
if (spi_claim_bus(slave))
return;
/* clear the control register */
rtc_write (RTC_CONTROL, 0x00); /* 1st step: reset WP */
rtc_write (RTC_CONTROL, 0x00); /* 2nd step: reset 1Hz, AIE1, AIE0 */
/* reset all alarms */
rtc_write (RTC_SECONDS_ALARM0, 0x00);
rtc_write (RTC_SECONDS_ALARM1, 0x00);
rtc_write (RTC_MINUTES_ALARM0, 0x00);
rtc_write (RTC_MINUTES_ALARM1, 0x00);
rtc_write (RTC_HOURS_ALARM0, 0x00);
rtc_write (RTC_HOURS_ALARM1, 0x00);
rtc_write (RTC_DAY_OF_WEEK_ALARM0, 0x00);
rtc_write (RTC_DAY_OF_WEEK_ALARM1, 0x00);
spi_release_bus(slave);
}
/* ------------------------------------------------------------------------- */
static unsigned char rtc_read (unsigned char reg)
{
int ret;
ret = spi_w8r8(slave, reg);
return ret < 0 ? 0 : ret;
}
/* ------------------------------------------------------------------------- */
static void rtc_write (unsigned char reg, unsigned char val)
{
unsigned char dout[2]; /* SPI Output Data Bytes */
unsigned char din[2]; /* SPI Input Data Bytes */
dout[0] = 0x80 | reg;
dout[1] = val;
spi_xfer (slave, 16, dout, din, SPI_XFER_BEGIN | SPI_XFER_END);
}
#endif /* end of code exclusion (see #ifdef CONFIG_SXNI855T above) */
#endif
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