Patches by Stephan Linz, 30 Jan 2004:

1: - board/altera/common/flash.c:flash_erase():
     o allow interrupts befor get_timer() call
     o check-up each erased sector and avoid unexpected timeouts
   - board/altera/dk1c20/dk1s10.c:board_early_init_f():
     o enclose sevenseg_set() in cpp condition
   - remove the ASMI configuration for DK1S10_standard_32 (never present)
   - fix some typed in mistakes in the NIOS documentation
2: - split DK1C20 configuration into several header files:
     o two new files for each NIOS CPU description
     o U-Boot related part is remaining in DK1C20.h
3: - split DK1S10 configuration into several header files:
     o two new files for each NIOS CPU description
     o U-Boot related part is remaining in DK1S10.h
4: - Add support for the Microtronix Linux Development Kit
     NIOS CPU configuration at the Altera Nios Development Kit,
     Stratix Edition (DK-1S10)
5: - Add documentation for the Altera Nios Development Kit,
     Stratix Edition (DK-1S10)
6: - Add support for the Nios Serial Peripharel Interface (SPI)
     (master only)
7: - Add support for the common U-Boot SPI framework at
     RTC driver DS1306

1 files changed, 343 insertions, 172 deletions

diff --git a/rtc/ds1306.c b/rtc/ds1306.c
index 9c11c60..20f1a50 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 */
+
+	/* 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));
+	}
 
-    init_spi();		/* set port B for software SPI */
+	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 */
 
-    /* Now we can enable the DS1306 RTC */
-    immap->im_cpm.cp_pbdat |= PB_SPI_CE;
-    udelay(10);
+	/* Read Year and convert to this century */
+	tmp->tm_year = bcd2bin (soft_spi_read ()) + 2000;
 
-    /* Shift out the address (0) of the time in the Clock Chip */
-    soft_spi_send(0);
+	/* Now we can disable the DS1306 RTC */
+	immap->im_cpm.cp_pbdat &= ~PB_SPI_CE;	/* Disable DS1306 Chip */
+	udelay (10);
 
-    /* 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 */
+	GregorianDay (tmp);	/* Determine the day of week */
 
-    /* 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;
+	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)
+{
+	volatile immap_t *immap = (immap_t *) CFG_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 = 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;
 	}
-    }
-    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 */
+	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);
+}
 
-    /* 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);
+/* Initialize Port B for software SPI */
+static void init_spi (void)
+{
+	volatile immap_t *immap = (immap_t *) CFG_IMMR;
 
-    GregorianDay(tmp);		/* Determine the day of week */
+	/* Force output pins to begin at logic 0 */
+	immap->im_cpm.cp_pbdat &= ~(PB_SPI_CE | PB_SPIMOSI | PB_SPISCK);
 
-    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 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);
 }
 
 /* ------------------------------------------------------------------------- */
 
-/* set clock time in DS1306 RTC and in MPC8xx RTC */
-void rtc_set(struct rtc_time *tmp)
+/* 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 *)CFG_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 = 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;
-    }
-
-    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);
+	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 */
+	}
 }
 
 /* ------------------------------------------------------------------------- */
 
-void rtc_reset(void)
+/* NOTE: soft_spi_read() assumes that the I/O lines are configured already */
+static unsigned char soft_spi_read (void)
 {
-    return;			/* nothing to do */
+	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 */
 }
 
 /* ------------------------------------------------------------------------- */
 
-static unsigned char bcd2bin(unsigned char n)
+void rtc_reset (void)
 {
-    return ((((n >> 4) & 0x0F) * 10) + (n & 0x0F));
+	return;			/* nothing to do */
+}
+
+#else  /* not CONFIG_SXNI855T */
+/* ************************************************************************* */
+
+
+
+
+
+/* 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);
 }
 
 /* ------------------------------------------------------------------------- */
 
-static unsigned int bin2bcd(unsigned int n)
+/* set clock time from *tmp in DS1306 RTC */
+void rtc_set (struct rtc_time *tmp)
 {
-    return (((n / 10) << 4) | (n % 10));
+	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));
 }
 
 /* ------------------------------------------------------------------------- */
 
-/* Initialize Port B for software SPI */
-static void init_spi(void) {
-    volatile immap_t *immap = (immap_t *)CFG_IMMR;
+/* reset the DS1306 */
+void rtc_reset (void)
+{
+	/* 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);
+}
+
+/* ------------------------------------------------------------------------- */
 
-    /* Force output pins to begin at logic 0 */
-    immap->im_cpm.cp_pbdat &= ~(PB_SPI_CE | PB_SPIMOSI | PB_SPISCK);
+static unsigned char rtc_read (unsigned char reg)
+{
+	unsigned char dout[2];	/* SPI Output Data Bytes */
+	unsigned char din[2];	/* SPI Input Data Bytes */
 
-    /* Set these 3 signals as outputs */
-    immap->im_cpm.cp_pbdir |= (PB_SPIMOSI | PB_SPI_CE | PB_SPISCK);
+	dout[0] = reg;
 
-    immap->im_cpm.cp_pbdir &= ~PB_SPIMISO;	/* Make MISO pin an input */
-    udelay(10);
+	if (spi_xfer (spi_chipsel[CFG_SPI_RTC_DEVID], 16, dout, din) != 0) {
+		return 0;
+	} else {
+		return din[1];
+	}
 }
 
 /* ------------------------------------------------------------------------- */
 
-/* NOTE: soft_spi_send() assumes that the I/O lines are configured already */
-static void soft_spi_send(unsigned char n)
+static void rtc_write (unsigned char reg, unsigned char val)
 {
-    volatile immap_t *immap = (immap_t *)CFG_IMMR;
-    unsigned char bitpos;	/* bit position to receive */
-    unsigned char i;		/* Loop Control */
+	unsigned char dout[2];	/* SPI Output Data Bytes */
+	unsigned char din[2];	/* SPI Input Data Bytes */
 
-    /* bit position to send, start with most significant bit */
-    bitpos = 0x80;
+	dout[0] = 0x80 | reg;
+	dout[1] = val;
 
-    /* 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 */
+	spi_xfer (spi_chipsel[CFG_SPI_RTC_DEVID], 16, dout, din);
+}
 
-	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);
+#endif /* end of code exclusion (see #ifdef CONFIG_SXNI855T above) */
 
-	immap->im_cpm.cp_pbdat &= ~PB_SPISCK;	/* Lower SCK */
-	udelay(10);
+/* ------------------------------------------------------------------------- */
 
-	bitpos >>= 1;		/* Shift for next bit position */
-    }
+static unsigned char bcd2bin (unsigned char n)
+{
+	return ((((n >> 4) & 0x0F) * 10) + (n & 0x0F));
 }
 
 /* ------------------------------------------------------------------------- */
 
-/* NOTE: soft_spi_read() assumes that the I/O lines are configured already */
-static unsigned char soft_spi_read(void)
+static unsigned int bin2bcd (unsigned int n)
 {
-    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 */
+	return (((n / 10) << 4) | (n % 10));
 }
-
 /* ------------------------------------------------------------------------- */
 
 #endif