cvmx-cn3010-evb-hs5.c revision 210284
1/***********************license start*************** 2 * Copyright (c) 2003-2008 Cavium Networks (support@cavium.com). All rights 3 * reserved. 4 * 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions are 8 * met: 9 * 10 * * Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 13 * * Redistributions in binary form must reproduce the above 14 * copyright notice, this list of conditions and the following 15 * disclaimer in the documentation and/or other materials provided 16 * with the distribution. 17 * 18 * * Neither the name of Cavium Networks nor the names of 19 * its contributors may be used to endorse or promote products 20 * derived from this software without specific prior written 21 * permission. 22 * 23 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, THE SOFTWARE IS PROVIDED "AS IS" 24 * AND WITH ALL FAULTS AND CAVIUM NETWORKS MAKES NO PROMISES, REPRESENTATIONS 25 * OR WARRANTIES, EITHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, WITH 26 * RESPECT TO THE SOFTWARE, INCLUDING ITS CONDITION, ITS CONFORMITY TO ANY 27 * REPRESENTATION OR DESCRIPTION, OR THE EXISTENCE OF ANY LATENT OR PATENT 28 * DEFECTS, AND CAVIUM SPECIFICALLY DISCLAIMS ALL IMPLIED (IF ANY) WARRANTIES 29 * OF TITLE, MERCHANTABILITY, NONINFRINGEMENT, FITNESS FOR A PARTICULAR 30 * PURPOSE, LACK OF VIRUSES, ACCURACY OR COMPLETENESS, QUIET ENJOYMENT, QUIET 31 * POSSESSION OR CORRESPONDENCE TO DESCRIPTION. THE ENTIRE RISK ARISING OUT 32 * OF USE OR PERFORMANCE OF THE SOFTWARE LIES WITH YOU. 33 * 34 * 35 * For any questions regarding licensing please contact marketing@caviumnetworks.com 36 * 37 ***********************license end**************************************/ 38 39 40 41 42 43 44/** 45 * @file 46 * 47 * Interface to the EBH-30xx specific devices 48 * 49 * <hr>$Revision: 41586 $<hr> 50 * 51 */ 52 53#include <time.h> 54#include "cvmx-config.h" 55#include "cvmx.h" 56#include "cvmx-sysinfo.h" 57#include "cvmx-cn3010-evb-hs5.h" 58#include "cvmx-twsi.h" 59 60 61static inline uint8_t bin2bcd(uint8_t bin) 62{ 63 return (bin / 10) << 4 | (bin % 10); 64} 65 66static inline uint8_t bcd2bin(uint8_t bcd) 67{ 68 return (bcd >> 4) * 10 + (bcd & 0xf); 69} 70 71#define TM_CHECK(_expr, _msg) \ 72 do { \ 73 if (_expr) { \ 74 cvmx_dprintf("Warning: RTC has invalid %s field\n", (_msg)); \ 75 rc = -1; \ 76 } \ 77 } while(0); 78 79static int validate_tm_struct(struct tm * tms) 80{ 81 int rc = 0; 82 83 if (!tms) 84 return -1; 85 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"); 93 94 return rc; 95} 96 97/* 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. 101 */ 102uint32_t cvmx_rtc_ds1337_read(void) 103{ 104 int i, retry; 105 uint32_t time; 106 uint8_t reg[8]; 107 uint8_t sec; 108 struct tm tms; 109 110 111 memset(®, 0, sizeof(reg)); 112 memset(&tms, 0, sizeof(struct tm)); 113 114 for(retry=0; retry<2; retry++) 115 { 116 /* Lockless read: detects the infrequent roll-over and retries */ 117 reg[0] = cvmx_twsi_read8(CVMX_RTC_DS1337_ADDR, 0x0); 118 for(i=1; i<7; i++) 119 reg[i] = cvmx_twsi_read8_cur_addr(CVMX_RTC_DS1337_ADDR); 120 121 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 */ 124 } 125 126 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 */ 130 { 131 tms.tm_hour = (tms.tm_hour + 12) % 24; 132 } 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]); 137 138 139 if (validate_tm_struct(&tms)) 140 cvmx_dprintf("Warning: RTC calendar is not configured properly\n"); 141 142 time = mktime(&tms); 143 144 return time; 145} 146 147/* 148 * Board-specific RTC write 149 * Time returned is in seconds from epoch (Jan 1 1970 at 00:00:00 UTC) 150 */ 151int cvmx_rtc_ds1337_write(uint32_t time) 152{ 153 int i, rc, retry; 154 struct tm tms; 155 uint8_t reg[8]; 156 uint8_t sec; 157 time_t time_from_epoch = time; 158 159 160 localtime_r(&time_from_epoch, &tms); 161 162 if (validate_tm_struct(&tms)) 163 { 164 cvmx_dprintf("Error: RTC was passed wrong calendar values, write failed\n"); 165 goto tm_invalid; 166 } 167 168 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*/ 175 { 176 reg[5] |= 0x80; 177 } 178 reg[6] = bin2bcd(tms.tm_year % 100); 179 180 /* Lockless write: detects the infrequent roll-over and retries */ 181 for(retry=0; retry<2; retry++) 182 { 183 rc = 0; 184 for(i=0; i<7; i++) 185 { 186 rc |= cvmx_twsi_write8(CVMX_RTC_DS1337_ADDR, i, reg[i]); 187 } 188 189 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 */ 192 } 193 194 return (rc ? -1 : 0); 195 196 tm_invalid: 197 return -1; 198} 199 200#ifdef CVMX_RTC_DEBUG 201 202void cvmx_rtc_ds1337_dump_state(void) 203{ 204 int i = 0; 205 206 printf("RTC:\n"); 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)); 210 } 211 printf("\n"); 212} 213 214#endif /* CVMX_RTC_DEBUG */ 215