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-rw-r--r--rtc/ds1306.c473
1 files changed, 322 insertions, 151 deletions
diff --git a/rtc/ds1306.c b/rtc/ds1306.c
index 9c11c600d..20f1a5085 100644
--- a/rtc/ds1306.c
+++ b/rtc/ds1306.c
@@ -1,6 +1,9 @@
/*
* (C) Copyright 2002 SIXNET, dge@sixnetio.com.
*
+ * (C) Copyright 2004, Li-Pro.Net <www.li-pro.net>
+ * Stephan Linz <linz@li-pro.net>
+ *
* See file CREDITS for list of people who contributed to this
* project.
*
@@ -21,20 +24,66 @@
*/
/*
- * Date & Time support for DS1306 RTC using software SPI
+ * 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_RTC_DS1306) && (CONFIG_COMMANDS & CFG_CMD_DATE)
-static unsigned int bin2bcd(unsigned int n);
-static unsigned char bcd2bin(unsigned char c);
-static void soft_spi_send(unsigned char n);
-static unsigned char soft_spi_read(void);
-static void init_spi(void);
+#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
+
+/*
+ * External table of chip select functions (see the appropriate board
+ * support for the actual definition of the table).
+ */
+extern spi_chipsel_type spi_chipsel[];
+extern int spi_chipsel_cnt;
+
+static unsigned int bin2bcd (unsigned int n);
+static unsigned char bcd2bin (unsigned char c);
+static unsigned char rtc_read (unsigned char reg);
+static void rtc_write (unsigned char reg, unsigned char val);
+
+
+
+
+
+/* ************************************************************************* */
+#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
@@ -48,227 +97,349 @@ static void init_spi(void);
/* ------------------------------------------------------------------------- */
/* read clock time from DS1306 and return it in *tmp */
-void rtc_get(struct rtc_time *tmp)
+void rtc_get (struct rtc_time *tmp)
{
- volatile immap_t *immap = (immap_t *)CFG_IMMR;
- unsigned char spi_byte; /* Data Byte */
+ volatile immap_t *immap = (immap_t *) CFG_IMMR;
+ unsigned char spi_byte; /* Data Byte */
- init_spi(); /* set port B for software SPI */
+ 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);
+ /* 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);
+ /* 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 */
+ /* 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;
+ /* 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));
}
- 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 */
+ 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;
+ /* 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);
+ /* Now we can disable the DS1306 RTC */
+ immap->im_cpm.cp_pbdat &= ~PB_SPI_CE; /* Disable DS1306 Chip */
+ udelay (10);
- GregorianDay(tmp); /* Determine the day of week */
+ GregorianDay (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);
+ 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);
}
/* ------------------------------------------------------------------------- */
/* set clock time in DS1306 RTC and in MPC8xx RTC */
-void rtc_set(struct rtc_time *tmp)
+void rtc_set (struct rtc_time *tmp)
{
- volatile immap_t *immap = (immap_t *)CFG_IMMR;
+ volatile immap_t *immap = (immap_t *) CFG_IMMR;
- init_spi(); /* set port B for software SPI */
+ 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);
+ /* 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 */
+ /* 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 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);
+ /* 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 */
+ /* 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 */
+ /* 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 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);
+ /* 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 */
+ /* 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);
+ /* 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;
+ /* 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 = mktime(tmp->tm_year, tmp->tm_mon, tmp->tm_mday,
- tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
+ tim = mktime (tmp->tm_year, tmp->tm_mon, tmp->tm_mday,
+ tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
- immap->im_sitk.sitk_rtck = KAPWR_KEY;
- immap->im_sit.sit_rtc = tim;
- }
+ 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);
+ 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);
}
/* ------------------------------------------------------------------------- */
-void rtc_reset(void)
+/* Initialize Port B for software SPI */
+static void init_spi (void)
{
- return; /* nothing to do */
+ volatile immap_t *immap = (immap_t *) CFG_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);
}
/* ------------------------------------------------------------------------- */
-static unsigned char bcd2bin(unsigned char n)
+/* NOTE: soft_spi_send() assumes that the I/O lines are configured already */
+static void soft_spi_send (unsigned char n)
{
- return ((((n >> 4) & 0x0F) * 10) + (n & 0x0F));
+ volatile immap_t *immap = (immap_t *) CFG_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 */
+ }
}
/* ------------------------------------------------------------------------- */
-static unsigned int bin2bcd(unsigned int n)
+/* NOTE: soft_spi_read() assumes that the I/O lines are configured already */
+static unsigned char soft_spi_read (void)
{
- return (((n / 10) << 4) | (n % 10));
+ volatile immap_t *immap = (immap_t *) CFG_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 */
}
/* ------------------------------------------------------------------------- */
-/* Initialize Port B for software SPI */
-static void init_spi(void) {
- volatile immap_t *immap = (immap_t *)CFG_IMMR;
+void rtc_reset (void)
+{
+ return; /* nothing to do */
+}
+
+#else /* not CONFIG_SXNI855T */
+/* ************************************************************************* */
+
- /* 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);
+
+/* read clock time from DS1306 and return it in *tmp */
+void rtc_get (struct rtc_time *tmp)
+{
+ unsigned char sec, min, hour, mday, wday, mon, year;
+
+ 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);
+
+ 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);
}
/* ------------------------------------------------------------------------- */
-/* NOTE: soft_spi_send() assumes that the I/O lines are configured already */
-static void soft_spi_send(unsigned char n)
+/* set clock time from *tmp in DS1306 RTC */
+void rtc_set (struct rtc_time *tmp)
+{
+ 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_YEAR, bin2bcd (tmp->tm_year - 2000));
+ rtc_write (RTC_MONTH, bin2bcd (tmp->tm_mon));
+ rtc_write (RTC_DATE_OF_MONTH, bin2bcd (tmp->tm_mday));
+ rtc_write (RTC_DAY_OF_WEEK, bin2bcd (tmp->tm_wday + 1));
+ rtc_write (RTC_HOURS, bin2bcd (tmp->tm_hour));
+ rtc_write (RTC_MINUTES, bin2bcd (tmp->tm_min));
+ rtc_write (RTC_SECONDS, bin2bcd (tmp->tm_sec));
+}
+
+/* ------------------------------------------------------------------------- */
+
+/* reset the DS1306 */
+void rtc_reset (void)
{
- volatile immap_t *immap = (immap_t *)CFG_IMMR;
- unsigned char bitpos; /* bit position to receive */
- unsigned char i; /* Loop Control */
+ /* clear the control register */
+ rtc_write (RTC_CONTROL, 0x00); /* 1st step: reset WP */
+ rtc_write (RTC_CONTROL, 0x00); /* 2nd step: reset 1Hz, AIE1, AIE0 */
- /* bit position to send, start with most significant bit */
- bitpos = 0x80;
+ /* 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);
+}
- /* 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);
+static unsigned char rtc_read (unsigned char reg)
+{
+ unsigned char dout[2]; /* SPI Output Data Bytes */
+ unsigned char din[2]; /* SPI Input Data Bytes */
- immap->im_cpm.cp_pbdat &= ~PB_SPISCK; /* Lower SCK */
- udelay(10);
+ dout[0] = reg;
- bitpos >>= 1; /* Shift for next bit position */
- }
+ if (spi_xfer (spi_chipsel[CFG_SPI_RTC_DEVID], 16, dout, din) != 0) {
+ return 0;
+ } else {
+ return din[1];
+ }
}
/* ------------------------------------------------------------------------- */
-/* NOTE: soft_spi_read() assumes that the I/O lines are configured already */
-static unsigned char soft_spi_read(void)
+static void rtc_write (unsigned char reg, unsigned char val)
{
- volatile immap_t *immap = (immap_t *)CFG_IMMR;
+ unsigned char dout[2]; /* SPI Output Data Bytes */
+ unsigned char din[2]; /* SPI Input Data Bytes */
- unsigned char spi_byte = 0; /* Return value, assume success */
- unsigned char bitpos; /* bit position to receive */
- unsigned char i; /* Loop Control */
+ dout[0] = 0x80 | reg;
+ dout[1] = val;
- /* bit position to receive, start with most significant bit */
- bitpos = 0x80;
+ spi_xfer (spi_chipsel[CFG_SPI_RTC_DEVID], 16, dout, din);
+}
+
+#endif /* end of code exclusion (see #ifdef CONFIG_SXNI855T above) */
- /* 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 */
+static unsigned char bcd2bin (unsigned char n)
+{
+ return ((((n >> 4) & 0x0F) * 10) + (n & 0x0F));
}
/* ------------------------------------------------------------------------- */
+static unsigned int bin2bcd (unsigned int n)
+{
+ return (((n / 10) << 4) | (n % 10));
+}
+/* ------------------------------------------------------------------------- */
+
#endif
generated by cgit v1.2.3-70-g09d2 (git 2.51.2) at 2025-10-31 16:14:42 +0000