+++ /dev/null
-/*
- * 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) && defined(CONFIG_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=100/10; /* 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
projects / karo-tx-uboot.git / blobdiff