Merge commit '87ddedd'

1 files changed, 438 insertions, 0 deletions

diff --git a/drivers/rtc/ds1306.c b/drivers/rtc/ds1306.c
new file mode 100644
index 0000000..89e433d
--- /dev/null
+++ b/drivers/rtc/ds1306.c
@@ -0,0 +1,438 @@
+/*
+ * (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.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+/*
+ * 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) && 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
+
+/*
+ * 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);
+
+/* ************************************************************************* */
+#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 */
+void rtc_get (struct rtc_time *tmp)
+{
+	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));
+	}
+
+	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);
+
+	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);
+}
+
+/* ------------------------------------------------------------------------- */
+
+/* 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;
+	}
+
+	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);
+}
+
+/* ------------------------------------------------------------------------- */
+
+/* Initialize Port B for software SPI */
+static void init_spi (void)
+{
+	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);
+}
+
+/* ------------------------------------------------------------------------- */
+
+/* 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;
+	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 *) 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 */
+}
+
+/* ------------------------------------------------------------------------- */
+
+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);
+
+/* 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);
+}
+
+/* ------------------------------------------------------------------------- */
+
+/* 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_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));
+}
+
+/* ------------------------------------------------------------------------- */
+
+/* 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);
+}
+
+/* ------------------------------------------------------------------------- */
+
+static unsigned char rtc_read (unsigned char reg)
+{
+	unsigned char dout[2];	/* SPI Output Data Bytes */
+	unsigned char din[2];	/* SPI Input Data Bytes */
+
+	dout[0] = reg;
+
+	if (spi_xfer (spi_chipsel[CFG_SPI_RTC_DEVID], 16, dout, din) != 0) {
+		return 0;
+	} else {
+		return din[1];
+	}
+}
+
+/* ------------------------------------------------------------------------- */
+
+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 (spi_chipsel[CFG_SPI_RTC_DEVID], 16, dout, din);
+}
+
+#endif /* end of code exclusion (see #ifdef CONFIG_SXNI855T above) */
+
+/* ------------------------------------------------------------------------- */
+
+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