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-rw-r--r--rtc/ds1302.c327
-rw-r--r--rtc/pcf8563.c144
2 files changed, 471 insertions, 0 deletions
diff --git a/rtc/ds1302.c b/rtc/ds1302.c
new file mode 100644
index 0000000..ec5616a
--- /dev/null
+++ b/rtc/ds1302.c
@@ -0,0 +1,327 @@
+/*
+ * ds1302.c - Support for the Dallas Semiconductor DS1302 Timekeeping Chip
+ *
+ * Rex G. Feany <rfeany@zumanetworks.com>
+ *
+ */
+
+#include <common.h>
+#include <command.h>
+#include <rtc.h>
+
+#if defined(CONFIG_RTC_DS1302) && (CONFIG_COMMANDS & CFG_CMD_DATE)
+
+/* GPP Pins */
+#define DATA 0x200
+#define SCLK 0x400
+#define RST 0x800
+
+/* Happy Fun Defines(tm) */
+#define RESET rtc_go_low(RST), rtc_go_low(SCLK)
+#define N_RESET rtc_go_high(RST), rtc_go_low(SCLK)
+
+#define CLOCK_HIGH rtc_go_high(SCLK)
+#define CLOCK_LOW rtc_go_low(SCLK)
+
+#define DATA_HIGH rtc_go_high(DATA)
+#define DATA_LOW rtc_go_low(DATA)
+#define DATA_READ (GTREGREAD(GPP_VALUE) & DATA)
+
+#undef RTC_DEBUG
+
+#ifdef RTC_DEBUG
+# define DPRINTF(x,args...) printf("ds1302: " x , ##args)
+static inline void DUMP(const char *ptr, int num)
+{
+ while (num--) printf("%x ", *ptr++);
+ printf("]\n");
+}
+#else
+# define DPRINTF(x,args...)
+# define DUMP(ptr, num)
+#endif
+
+/* time data format for DS1302 */
+struct ds1302_st
+{
+ unsigned char CH:1; /* clock halt 1=stop 0=start */
+ unsigned char sec10:3;
+ unsigned char sec:4;
+
+ unsigned char zero0:1;
+ unsigned char min10:3;
+ unsigned char min:4;
+
+ unsigned char fmt:1; /* 1=12 hour 0=24 hour */
+ unsigned char zero1:1;
+ unsigned char hr10:2; /* 10 (0-2) or am/pm (am/pm, 0-1) */
+ unsigned char hr:4;
+
+ unsigned char zero2:2;
+ unsigned char date10:2;
+ unsigned char date:4;
+
+ unsigned char zero3:3;
+ unsigned char month10:1;
+ unsigned char month:4;
+
+ unsigned char zero4:5;
+ unsigned char day:3; /* day of week */
+
+ unsigned char year10:4;
+ unsigned char year:4;
+
+ unsigned char WP:1; /* write protect 1=protect 0=unprot */
+ unsigned char zero5:7;
+};
+
+static int ds1302_initted=0;
+
+/* Pin control */
+static inline void
+rtc_go_high(unsigned int mask)
+{
+ unsigned int f = GTREGREAD(GPP_VALUE) | mask;
+
+ GT_REG_WRITE(GPP_VALUE, f);
+}
+
+static inline void
+rtc_go_low(unsigned int mask)
+{
+ unsigned int f = GTREGREAD(GPP_VALUE) & ~mask;
+
+ GT_REG_WRITE(GPP_VALUE, f);
+}
+
+static inline void
+rtc_go_input(unsigned int mask)
+{
+ unsigned int f = GTREGREAD(GPP_IO_CONTROL) & ~mask;
+
+ GT_REG_WRITE(GPP_IO_CONTROL, f);
+}
+
+static inline void
+rtc_go_output(unsigned int mask)
+{
+ unsigned int f = GTREGREAD(GPP_IO_CONTROL) | mask;
+
+ GT_REG_WRITE(GPP_IO_CONTROL, f);
+}
+
+/* Access data in RTC */
+
+static void
+write_byte(unsigned char b)
+{
+ int i;
+ unsigned char mask=1;
+
+ for(i=0;i<8;i++) {
+ CLOCK_LOW; /* Lower clock */
+ (b&mask)?DATA_HIGH:DATA_LOW; /* set data */
+ udelay(1);
+ CLOCK_HIGH; /* latch data with rising clock */
+ udelay(1);
+ mask=mask<<1;
+ }
+}
+
+static unsigned char
+read_byte(void)
+{
+ int i;
+ unsigned char mask=1;
+ unsigned char b=0;
+
+ for(i=0;i<8;i++) {
+ CLOCK_LOW;
+ udelay(1);
+ if (DATA_READ) b|=mask; /* if this bit is high, set in b */
+ CLOCK_HIGH; /* clock out next bit */
+ udelay(1);
+ mask=mask<<1;
+ }
+ return b;
+}
+
+static void
+read_ser_drv(unsigned char addr, unsigned char *buf, int count)
+{
+ int i;
+#ifdef RTC_DEBUG
+ char *foo = buf;
+#endif
+
+ DPRINTF("READ 0x%x bytes @ 0x%x [ ", count, addr);
+
+ addr|=1; /* READ */
+ N_RESET;
+ udelay(4);
+ write_byte(addr);
+ rtc_go_input(DATA); /* Put gpp pin into input mode */
+ udelay(1);
+ for(i=0;i<count;i++) *(buf++)=read_byte();
+ RESET;
+ rtc_go_output(DATA);/* Reset gpp for output */
+ udelay(4);
+
+ DUMP(foo, count);
+}
+
+static void
+write_ser_drv(unsigned char addr, unsigned char *buf, int count)
+{
+ int i;
+
+ DPRINTF("WRITE 0x%x bytes @ 0x%x [ ", count, addr);
+ DUMP(buf, count);
+
+ addr&=~1; /* WRITE */
+ N_RESET;
+ udelay(4);
+ write_byte(addr);
+ for(i=0;i<count;i++) write_byte(*(buf++));
+ RESET;
+ udelay(4);
+
+}
+
+void
+rtc_init(void)
+{
+ struct ds1302_st bbclk;
+ unsigned char b;
+ int mod;
+
+ DPRINTF("init\n");
+
+ rtc_go_output(DATA|SCLK|RST);
+
+ /* disable write protect */
+ b = 0;
+ write_ser_drv(0x8e,&b,1);
+
+ /* enable trickle */
+ b = 0xa5; /* 1010.0101 */
+ write_ser_drv(0x90,&b,1);
+
+ /* read burst */
+ read_ser_drv(0xbe, (unsigned char *)&bbclk, 8);
+
+ /* Sanity checks */
+ mod = 0;
+ if (bbclk.CH) {
+ printf("ds1302: Clock was halted, starting clock\n");
+ bbclk.CH=0;
+ mod=1;
+ }
+
+ if (bbclk.fmt) {
+ printf("ds1302: Clock was in 12 hour mode, fixing\n");
+ bbclk.fmt=0;
+ mod=1;
+ }
+
+ if (bbclk.year>9) {
+ printf("ds1302: Year was corrupted, fixing\n");
+ bbclk.year10=100; /* 2000 - why not? ;) */
+ bbclk.year=0;
+ mod=1;
+ }
+
+ /* Write out the changes if needed */
+ if (mod) {
+ /* enable write protect */
+ bbclk.WP = 1;
+ write_ser_drv(0xbe,(unsigned char *)&bbclk,8);
+ } else {
+ /* Else just turn write protect on */
+ b = 0x80;
+ write_ser_drv(0x8e,&b,1);
+ }
+ DPRINTF("init done\n");
+
+ ds1302_initted=1;
+}
+
+void
+rtc_reset(void)
+{
+ if(!ds1302_initted) rtc_init();
+ /* TODO */
+}
+
+void
+rtc_get(struct rtc_time *tmp)
+{
+ struct ds1302_st bbclk;
+
+ if(!ds1302_initted) rtc_init();
+
+ read_ser_drv(0xbe,(unsigned char *)&bbclk, 8); /* read burst */
+
+ if (bbclk.CH) {
+ printf("ds1302: rtc_get: Clock was halted, clock probably "
+ "corrupt\n");
+ }
+
+ tmp->tm_sec=10*bbclk.sec10+bbclk.sec;
+ tmp->tm_min=10*bbclk.min10+bbclk.min;
+ tmp->tm_hour=10*bbclk.hr10+bbclk.hr;
+ tmp->tm_wday=bbclk.day;
+ tmp->tm_mday=10*bbclk.date10+bbclk.date;
+ tmp->tm_mon=10*bbclk.month10+bbclk.month;
+ tmp->tm_year=10*bbclk.year10+bbclk.year + 1900;
+
+ tmp->tm_yday = 0;
+ tmp->tm_isdst= 0;
+
+ DPRINTF("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 );
+}
+
+void
+rtc_set(struct rtc_time *tmp)
+{
+ struct ds1302_st bbclk;
+ unsigned char b=0;
+
+ if(!ds1302_initted) rtc_init();
+
+ DPRINTF("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);
+
+ memset(&bbclk,0,sizeof(bbclk));
+ bbclk.CH=0; /* dont halt */
+ bbclk.WP=1; /* write protect when we're done */
+
+ bbclk.sec10=tmp->tm_sec/10;
+ bbclk.sec=tmp->tm_sec%10;
+
+ bbclk.min10=tmp->tm_min/10;
+ bbclk.min=tmp->tm_min%10;
+
+ bbclk.hr10=tmp->tm_hour/10;
+ bbclk.hr=tmp->tm_hour%10;
+
+ bbclk.day=tmp->tm_wday;
+
+ bbclk.date10=tmp->tm_mday/10;
+ bbclk.date=tmp->tm_mday%10;
+
+ bbclk.month10=tmp->tm_mon/10;
+ bbclk.month=tmp->tm_mon%10;
+
+ tmp->tm_year -= 1900;
+ bbclk.year10=tmp->tm_year/10;
+ bbclk.year=tmp->tm_year%10;
+
+ write_ser_drv(0x8e,&b,1); /* disable write protect */
+ write_ser_drv(0xbe,(unsigned char *)&bbclk, 8); /* write burst */
+}
+
+#endif
diff --git a/rtc/pcf8563.c b/rtc/pcf8563.c
new file mode 100644
index 0000000..97b09b8
--- /dev/null
+++ b/rtc/pcf8563.c
@@ -0,0 +1,144 @@
+/*
+ * (C) Copyright 2001
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * 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 Philips PCF8563 RTC
+ */
+
+/* #define DEBUG */
+
+#include <common.h>
+#include <command.h>
+#include <rtc.h>
+#include <i2c.h>
+
+#if defined(CONFIG_RTC_PCF8563) && (CONFIG_COMMANDS & CFG_CMD_DATE)
+
+static uchar rtc_read (uchar reg);
+static void rtc_write (uchar reg, uchar val);
+static uchar bin2bcd (unsigned int n);
+static unsigned bcd2bin(uchar c);
+
+/* ------------------------------------------------------------------------- */
+
+void rtc_get (struct rtc_time *tmp)
+{
+ uchar sec, min, hour, mday, wday, mon_cent, year;
+
+ sec = rtc_read (0x02);
+ min = rtc_read (0x03);
+ hour = rtc_read (0x04);
+ mday = rtc_read (0x05);
+ wday = rtc_read (0x06);
+ mon_cent= rtc_read (0x07);
+ year = rtc_read (0x08);
+
+ debug ( "Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x "
+ "hr: %02x min: %02x sec: %02x\n",
+ year, mon_cent, mday, wday,
+ hour, min, sec );
+ debug ( "Alarms: wday: %02x day: %02x hour: %02x min: %02x\n",
+ rtc_read (0x0C),
+ rtc_read (0x0B),
+ rtc_read (0x0A),
+ rtc_read (0x09) );
+
+ if (sec & 0x80) {
+ printf ("### Warning: RTC Low Voltage - date/time not reliable\n");
+ }
+
+ tmp->tm_sec = bcd2bin (sec & 0x7F);
+ tmp->tm_min = bcd2bin (min & 0x7F);
+ tmp->tm_hour = bcd2bin (hour & 0x3F);
+ tmp->tm_mday = bcd2bin (mday & 0x3F);
+ tmp->tm_mon = bcd2bin (mon_cent & 0x1F);
+ tmp->tm_year = bcd2bin (year) + ((mon_cent & 0x80) ? 2000 : 1900);
+ tmp->tm_wday = bcd2bin (wday & 0x07);
+ 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);
+}
+
+void rtc_set (struct rtc_time *tmp)
+{
+ uchar century;
+
+ 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 (0x08, bin2bcd(tmp->tm_year % 100));
+
+ century = (tmp->tm_year >= 2000) ? 0x80 : 0;
+ rtc_write (0x07, bin2bcd(tmp->tm_mon) | century);
+
+ rtc_write (0x06, bin2bcd(tmp->tm_wday));
+ rtc_write (0x05, bin2bcd(tmp->tm_mday));
+ rtc_write (0x04, bin2bcd(tmp->tm_hour));
+ rtc_write (0x03, bin2bcd(tmp->tm_min ));
+ rtc_write (0x02, bin2bcd(tmp->tm_sec ));
+}
+
+void rtc_reset (void)
+{
+ /* clear all control & status registers */
+ rtc_write (0x00, 0x00);
+ rtc_write (0x01, 0x00);
+ rtc_write (0x0D, 0x00);
+
+ /* clear Voltage Low bit */
+ rtc_write (0x02, rtc_read (0x02) & 0x7F);
+
+ /* reset all alarms */
+ rtc_write (0x09, 0x00);
+ rtc_write (0x0A, 0x00);
+ rtc_write (0x0B, 0x00);
+ rtc_write (0x0C, 0x00);
+}
+
+/* ------------------------------------------------------------------------- */
+
+static uchar rtc_read (uchar reg)
+{
+ return (i2c_reg_read (CFG_I2C_RTC_ADDR, reg));
+}
+
+static void rtc_write (uchar reg, uchar val)
+{
+ i2c_reg_write (CFG_I2C_RTC_ADDR, reg, val);
+}
+
+static unsigned bcd2bin (uchar n)
+{
+ return ((((n >> 4) & 0x0F) * 10) + (n & 0x0F));
+}
+
+static unsigned char bin2bcd (unsigned int n)
+{
+ return (((n / 10) << 4) | (n % 10));
+}
+
+#endif /* CONFIG_RTC_PCF8563 && CFG_CMD_DATE */
generated by cgit v1.1 at 2024-11-16 16:50:09 +0000