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 $<hr>
50 *
51 */
52
53 #include <sys/cdefs.h>
54 __FBSDID("$FreeBSD$");
55
56 #include <sys/param.h>
57 #include <sys/timespec.h>
58 #include <sys/clock.h>
59 #include <sys/libkern.h>
60
61 #include <contrib/octeon-sdk/cvmx.h>
62 #include <contrib/octeon-sdk/cvmx-cn3010-evb-hs5.h>
63 #include <contrib/octeon-sdk/cvmx-twsi.h>
64
65 #define CT_CHECK(_expr, _msg) \
66 do { \
67 if (_expr) { \
68 cvmx_dprintf("Warning: RTC has invalid %s field\n", (_msg)); \
69 rc = -1; \
70 } \
71 } while(0);
72
73 static int validate_ct_struct(struct clocktime *ct)
74 {
75 int rc = 0;
76
77 if (!ct)
78 return -1;
79
80 CT_CHECK(ct->sec < 0 || ct->sec > 60, "second"); /* + Leap sec */
81 CT_CHECK(ct->min < 0 || ct->min > 59, "minute");
82 CT_CHECK(ct->hour < 0 || ct->hour > 23, "hour");
83 CT_CHECK(ct->day < 1 || ct->day > 31, "day");
84 CT_CHECK(ct->dow < 0 || ct->dow > 6, "day of week");
85 CT_CHECK(ct->mon < 1 || ct->mon > 12, "month");
86 CT_CHECK(ct->year > 2037,"year");
87
88 return rc;
89 }
90
91 /*
92 * Board-specifc RTC read
93 * Time is expressed in seconds from epoch (Jan 1 1970 at 00:00:00 UTC)
94 * and converted internally to calendar format.
95 */
96 uint32_t cvmx_rtc_ds1337_read(void)
97 {
98 int i, retry;
99 uint8_t reg[8];
100 uint8_t sec;
101 struct clocktime ct;
102 struct timespec ts;
103
104
105 memset(®, 0, sizeof(reg));
106 memset(&ct, 0, sizeof(ct));
107
108 for(retry=0; retry<2; retry++)
109 {
110 /* Lockless read: detects the infrequent roll-over and retries */
111 reg[0] = cvmx_twsi_read8(CVMX_RTC_DS1337_ADDR, 0x0);
112 for(i=1; i<7; i++)
113 reg[i] = cvmx_twsi_read8_cur_addr(CVMX_RTC_DS1337_ADDR);
114
115 sec = cvmx_twsi_read8(CVMX_RTC_DS1337_ADDR, 0x0);
116 if ((sec & 0xf) == (reg[0] & 0xf))
117 break; /* Time did not roll-over, value is correct */
118 }
119
120 ct.sec = bcd2bin(reg[0] & 0x7f);
121 ct.min = bcd2bin(reg[1] & 0x7f);
122 ct.hour = bcd2bin(reg[2] & 0x3f);
123 if ((reg[2] & 0x40) && (reg[2] & 0x20)) /* AM/PM format and is PM time */
124 {
125 ct.hour = (ct.hour + 12) % 24;
126 }
127 ct.dow = (reg[3] & 0x7) - 1; /* Day of week field is 0..6 */
128 ct.day = bcd2bin(reg[4] & 0x3f);
129 ct.mon = bcd2bin(reg[5] & 0x1f); /* Month field is 1..12 */
130 #if defined(OCTEON_BOARD_CAPK_0100ND)
131 /*
132 * CAPK-0100ND uses DS1307 that does not have century bit
133 */
134 ct.year = 2000 + bcd2bin(reg[6]);
135 #else
136 ct.year = ((reg[5] & 0x80) ? 2000 : 1900) + bcd2bin(reg[6]);
137 #endif
138
139 if (validate_ct_struct(&ct))
140 cvmx_dprintf("Warning: RTC calendar is not configured properly\n");
141
142 if (clock_ct_to_ts(&ct, &ts) != 0) {
143 cvmx_dprintf("Warning: RTC calendar is not configured properly\n");
144 return 0;
145 }
146
147 return ts.tv_sec;
148 }
149
150 /*
151 * Board-specific RTC write
152 * Time returned is in seconds from epoch (Jan 1 1970 at 00:00:00 UTC)
153 */
154 int cvmx_rtc_ds1337_write(uint32_t time)
155 {
156 struct clocktime ct;
157 struct timespec ts;
158 int i, rc, retry;
159 uint8_t reg[8];
160 uint8_t sec;
161
162 ts.tv_sec = time;
163 ts.tv_nsec = 0;
164
165 clock_ts_to_ct(&ts, &ct);
166
167 if (validate_ct_struct(&ct))
168 {
169 cvmx_dprintf("Error: RTC was passed wrong calendar values, write failed\n");
170 goto ct_invalid;
171 }
172
173 reg[0] = bin2bcd(ct.sec);
174 reg[1] = bin2bcd(ct.min);
175 reg[2] = bin2bcd(ct.hour); /* Force 0..23 format even if using AM/PM */
176 reg[3] = bin2bcd(ct.dow + 1);
177 reg[4] = bin2bcd(ct.day);
178 reg[5] = bin2bcd(ct.mon);
179 #if !defined(OCTEON_BOARD_CAPK_0100ND)
180 if (ct.year >= 2000) /* Set century bit*/
181 {
182 reg[5] |= 0x80;
183 }
184 #endif
185 reg[6] = bin2bcd(ct.year % 100);
186
187 /* Lockless write: detects the infrequent roll-over and retries */
188 for(retry=0; retry<2; retry++)
189 {
190 rc = 0;
191 for(i=0; i<7; i++)
192 {
193 rc |= cvmx_twsi_write8(CVMX_RTC_DS1337_ADDR, i, reg[i]);
194 }
195
196 sec = cvmx_twsi_read8(CVMX_RTC_DS1337_ADDR, 0x0);
197 if ((sec & 0xf) == (reg[0] & 0xf))
198 break; /* Time did not roll-over, value is correct */
199 }
200
201 return (rc ? -1 : 0);
202
203 ct_invalid:
204 return -1;
205 }
206
207 #ifdef CVMX_RTC_DEBUG
208
209 void cvmx_rtc_ds1337_dump_state(void)
210 {
211 int i = 0;
212
213 printf("RTC:\n");
214 printf("%d : %02X ", i, cvmx_twsi_read8(CVMX_RTC_DS1337_ADDR, 0x0));
215 for(i=1; i<16; i++) {
216 printf("%02X ", cvmx_twsi_read8_cur_addr(CVMX_RTC_DS1337_ADDR));
217 }
218 printf("\n");
219 }
220
221 #endif /* CVMX_RTC_DEBUG */
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