1 /***********************license start***************
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37 ***********************license end**************************************/
47 * Interface to the EBH-30xx specific devices
49 * <hr>$Revision: 41586 $<hr>
54 #include "cvmx-config.h"
56 #include "cvmx-sysinfo.h"
57 #include "cvmx-cn3010-evb-hs5.h"
58 #include "cvmx-twsi.h"
61 static inline uint8_t bin2bcd(uint8_t bin)
63 return (bin / 10) << 4 | (bin % 10);
66 static inline uint8_t bcd2bin(uint8_t bcd)
68 return (bcd >> 4) * 10 + (bcd & 0xf);
71 #define TM_CHECK(_expr, _msg) \
74 cvmx_dprintf("Warning: RTC has invalid %s field\n", (_msg)); \
79 static int validate_tm_struct(struct tm * tms)
86 TM_CHECK(tms->tm_sec < 0 || tms->tm_sec > 60, "second"); /* + Leap sec */
87 TM_CHECK(tms->tm_min < 0 || tms->tm_min > 59, "minute");
88 TM_CHECK(tms->tm_hour < 0 || tms->tm_hour > 23, "hour");
89 TM_CHECK(tms->tm_mday < 1 || tms->tm_mday > 31, "day");
90 TM_CHECK(tms->tm_wday < 0 || tms->tm_wday > 6, "day of week");
91 TM_CHECK(tms->tm_mon < 0 || tms->tm_mon > 11, "month");
92 TM_CHECK(tms->tm_year < 0 || tms->tm_year > 200,"year");
98 * Board-specifc RTC read
99 * Time is expressed in seconds from epoch (Jan 1 1970 at 00:00:00 UTC)
100 * and converted internally to calendar format.
102 uint32_t cvmx_rtc_ds1337_read(void)
111 memset(®, 0, sizeof(reg));
112 memset(&tms, 0, sizeof(struct tm));
114 for(retry=0; retry<2; retry++)
116 /* Lockless read: detects the infrequent roll-over and retries */
117 reg[0] = cvmx_twsi_read8(CVMX_RTC_DS1337_ADDR, 0x0);
119 reg[i] = cvmx_twsi_read8_cur_addr(CVMX_RTC_DS1337_ADDR);
121 sec = cvmx_twsi_read8(CVMX_RTC_DS1337_ADDR, 0x0);
122 if ((sec & 0xf) == (reg[0] & 0xf))
123 break; /* Time did not roll-over, value is correct */
126 tms.tm_sec = bcd2bin(reg[0] & 0x7f);
127 tms.tm_min = bcd2bin(reg[1] & 0x7f);
128 tms.tm_hour = bcd2bin(reg[2] & 0x3f);
129 if ((reg[2] & 0x40) && (reg[2] & 0x20)) /* AM/PM format and is PM time */
131 tms.tm_hour = (tms.tm_hour + 12) % 24;
133 tms.tm_wday = (reg[3] & 0x7) - 1; /* Day of week field is 0..6 */
134 tms.tm_mday = bcd2bin(reg[4] & 0x3f);
135 tms.tm_mon = bcd2bin(reg[5] & 0x1f) - 1; /* Month field is 0..11 */
136 tms.tm_year = ((reg[5] & 0x80) ? 100 : 0) + bcd2bin(reg[6]);
139 if (validate_tm_struct(&tms))
140 cvmx_dprintf("Warning: RTC calendar is not configured properly\n");
148 * Board-specific RTC write
149 * Time returned is in seconds from epoch (Jan 1 1970 at 00:00:00 UTC)
151 int cvmx_rtc_ds1337_write(uint32_t time)
157 time_t time_from_epoch = time;
160 localtime_r(&time_from_epoch, &tms);
162 if (validate_tm_struct(&tms))
164 cvmx_dprintf("Error: RTC was passed wrong calendar values, write failed\n");
168 reg[0] = bin2bcd(tms.tm_sec);
169 reg[1] = bin2bcd(tms.tm_min);
170 reg[2] = bin2bcd(tms.tm_hour); /* Force 0..23 format even if using AM/PM */
171 reg[3] = bin2bcd(tms.tm_wday + 1);
172 reg[4] = bin2bcd(tms.tm_mday);
173 reg[5] = bin2bcd(tms.tm_mon + 1);
174 if (tms.tm_year >= 100) /* Set century bit*/
178 reg[6] = bin2bcd(tms.tm_year % 100);
180 /* Lockless write: detects the infrequent roll-over and retries */
181 for(retry=0; retry<2; retry++)
186 rc |= cvmx_twsi_write8(CVMX_RTC_DS1337_ADDR, i, reg[i]);
189 sec = cvmx_twsi_read8(CVMX_RTC_DS1337_ADDR, 0x0);
190 if ((sec & 0xf) == (reg[0] & 0xf))
191 break; /* Time did not roll-over, value is correct */
194 return (rc ? -1 : 0);
200 #ifdef CVMX_RTC_DEBUG
202 void cvmx_rtc_ds1337_dump_state(void)
207 printf("%d : %02X ", i, cvmx_twsi_read8(CVMX_RTC_DS1337_ADDR, 0x0));
208 for(i=1; i<16; i++) {
209 printf("%02X ", cvmx_twsi_read8_cur_addr(CVMX_RTC_DS1337_ADDR));
214 #endif /* CVMX_RTC_DEBUG */