1 /*
2 * Copyright (C) 2000, 2001 Broadcom Corporation
3 *
4 * Copyright (C) 2002 MontaVista Software Inc.
5 * Author: jsun@mvista.com or jsun@junsun.net
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the
9 * Free Software Foundation; either version 2 of the License, or (at your
10 * option) any later version.
11 */
12 #include <linux/bcd.h>
13 #include <linux/types.h>
14 #include <linux/time.h>
15
16 #include <asm/time.h>
17 #include <asm/addrspace.h>
18 #include <asm/io.h>
19
20 #include <asm/sibyte/sb1250.h>
21 #include <asm/sibyte/sb1250_regs.h>
22 #include <asm/sibyte/sb1250_smbus.h>
23
24
25 /* Xicor 1241 definitions */
26
27 /*
28 * Register bits
29 */
30
31 #define X1241REG_SR_BAT 0x80 /* currently on battery power */
32 #define X1241REG_SR_RWEL 0x04 /* r/w latch is enabled, can write RTC */
33 #define X1241REG_SR_WEL 0x02 /* r/w latch is unlocked, can enable r/w now */
34 #define X1241REG_SR_RTCF 0x01 /* clock failed */
35 #define X1241REG_BL_BP2 0x80 /* block protect 2 */
36 #define X1241REG_BL_BP1 0x40 /* block protect 1 */
37 #define X1241REG_BL_BP0 0x20 /* block protect 0 */
38 #define X1241REG_BL_WD1 0x10
39 #define X1241REG_BL_WD0 0x08
40 #define X1241REG_HR_MIL 0x80 /* military time format */
41
42 /*
43 * Register numbers
44 */
45
46 #define X1241REG_BL 0x10 /* block protect bits */
47 #define X1241REG_INT 0x11 /* */
48 #define X1241REG_SC 0x30 /* Seconds */
49 #define X1241REG_MN 0x31 /* Minutes */
50 #define X1241REG_HR 0x32 /* Hours */
51 #define X1241REG_DT 0x33 /* Day of month */
52 #define X1241REG_MO 0x34 /* Month */
53 #define X1241REG_YR 0x35 /* Year */
54 #define X1241REG_DW 0x36 /* Day of Week */
55 #define X1241REG_Y2K 0x37 /* Year 2K */
56 #define X1241REG_SR 0x3F /* Status register */
57
58 #define X1241_CCR_ADDRESS 0x6F
59
60 #define SMB_CSR(reg) IOADDR(A_SMB_REGISTER(1, reg))
61
xicor_read(uint8_t addr)62 static int xicor_read(uint8_t addr)
63 {
64 while (__raw_readq(SMB_CSR(R_SMB_STATUS)) & M_SMB_BUSY)
65 ;
66
67 __raw_writeq((addr >> 8) & 0x7, SMB_CSR(R_SMB_CMD));
68 __raw_writeq(addr & 0xff, SMB_CSR(R_SMB_DATA));
69 __raw_writeq(V_SMB_ADDR(X1241_CCR_ADDRESS) | V_SMB_TT_WR2BYTE,
70 SMB_CSR(R_SMB_START));
71
72 while (__raw_readq(SMB_CSR(R_SMB_STATUS)) & M_SMB_BUSY)
73 ;
74
75 __raw_writeq(V_SMB_ADDR(X1241_CCR_ADDRESS) | V_SMB_TT_RD1BYTE,
76 SMB_CSR(R_SMB_START));
77
78 while (__raw_readq(SMB_CSR(R_SMB_STATUS)) & M_SMB_BUSY)
79 ;
80
81 if (__raw_readq(SMB_CSR(R_SMB_STATUS)) & M_SMB_ERROR) {
82 /* Clear error bit by writing a 1 */
83 __raw_writeq(M_SMB_ERROR, SMB_CSR(R_SMB_STATUS));
84 return -1;
85 }
86
87 return (__raw_readq(SMB_CSR(R_SMB_DATA)) & 0xff);
88 }
89
xicor_write(uint8_t addr,int b)90 static int xicor_write(uint8_t addr, int b)
91 {
92 while (__raw_readq(SMB_CSR(R_SMB_STATUS)) & M_SMB_BUSY)
93 ;
94
95 __raw_writeq(addr, SMB_CSR(R_SMB_CMD));
96 __raw_writeq((addr & 0xff) | ((b & 0xff) << 8), SMB_CSR(R_SMB_DATA));
97 __raw_writeq(V_SMB_ADDR(X1241_CCR_ADDRESS) | V_SMB_TT_WR3BYTE,
98 SMB_CSR(R_SMB_START));
99
100 while (__raw_readq(SMB_CSR(R_SMB_STATUS)) & M_SMB_BUSY)
101 ;
102
103 if (__raw_readq(SMB_CSR(R_SMB_STATUS)) & M_SMB_ERROR) {
104 /* Clear error bit by writing a 1 */
105 __raw_writeq(M_SMB_ERROR, SMB_CSR(R_SMB_STATUS));
106 return -1;
107 } else {
108 return 0;
109 }
110 }
111
xicor_set_time(unsigned long t)112 int xicor_set_time(unsigned long t)
113 {
114 struct rtc_time tm;
115 int tmp;
116 unsigned long flags;
117
118 rtc_time_to_tm(t, &tm);
119 tm.tm_year += 1900;
120
121 spin_lock_irqsave(&rtc_lock, flags);
122 /* unlock writes to the CCR */
123 xicor_write(X1241REG_SR, X1241REG_SR_WEL);
124 xicor_write(X1241REG_SR, X1241REG_SR_WEL | X1241REG_SR_RWEL);
125
126 /* trivial ones */
127 tm.tm_sec = bin2bcd(tm.tm_sec);
128 xicor_write(X1241REG_SC, tm.tm_sec);
129
130 tm.tm_min = bin2bcd(tm.tm_min);
131 xicor_write(X1241REG_MN, tm.tm_min);
132
133 tm.tm_mday = bin2bcd(tm.tm_mday);
134 xicor_write(X1241REG_DT, tm.tm_mday);
135
136 /* tm_mon starts from 0, *ick* */
137 tm.tm_mon ++;
138 tm.tm_mon = bin2bcd(tm.tm_mon);
139 xicor_write(X1241REG_MO, tm.tm_mon);
140
141 /* year is split */
142 tmp = tm.tm_year / 100;
143 tm.tm_year %= 100;
144 xicor_write(X1241REG_YR, tm.tm_year);
145 xicor_write(X1241REG_Y2K, tmp);
146
147 /* hour is the most tricky one */
148 tmp = xicor_read(X1241REG_HR);
149 if (tmp & X1241REG_HR_MIL) {
150 /* 24 hour format */
151 tm.tm_hour = bin2bcd(tm.tm_hour);
152 tmp = (tmp & ~0x3f) | (tm.tm_hour & 0x3f);
153 } else {
154 /* 12 hour format, with 0x2 for pm */
155 tmp = tmp & ~0x3f;
156 if (tm.tm_hour >= 12) {
157 tmp |= 0x20;
158 tm.tm_hour -= 12;
159 }
160 tm.tm_hour = bin2bcd(tm.tm_hour);
161 tmp |= tm.tm_hour;
162 }
163 xicor_write(X1241REG_HR, tmp);
164
165 xicor_write(X1241REG_SR, 0);
166 spin_unlock_irqrestore(&rtc_lock, flags);
167
168 return 0;
169 }
170
xicor_get_time(void)171 unsigned long xicor_get_time(void)
172 {
173 unsigned int year, mon, day, hour, min, sec, y2k;
174 unsigned long flags;
175
176 spin_lock_irqsave(&rtc_lock, flags);
177 sec = xicor_read(X1241REG_SC);
178 min = xicor_read(X1241REG_MN);
179 hour = xicor_read(X1241REG_HR);
180
181 if (hour & X1241REG_HR_MIL) {
182 hour &= 0x3f;
183 } else {
184 if (hour & 0x20)
185 hour = (hour & 0xf) + 0x12;
186 }
187
188 day = xicor_read(X1241REG_DT);
189 mon = xicor_read(X1241REG_MO);
190 year = xicor_read(X1241REG_YR);
191 y2k = xicor_read(X1241REG_Y2K);
192 spin_unlock_irqrestore(&rtc_lock, flags);
193
194 sec = bcd2bin(sec);
195 min = bcd2bin(min);
196 hour = bcd2bin(hour);
197 day = bcd2bin(day);
198 mon = bcd2bin(mon);
199 year = bcd2bin(year);
200 y2k = bcd2bin(y2k);
201
202 year += (y2k * 100);
203
204 return mktime(year, mon, day, hour, min, sec);
205 }
206
xicor_probe(void)207 int xicor_probe(void)
208 {
209 return (xicor_read(X1241REG_SC) != -1);
210 }
211