+++ /dev/null
-/*
- * (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
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