2 * Copyright (C) 2000, 2001 Broadcom Corporation
4 * Copyright (C) 2002 MontaVista Software Inc.
5 * Author: jsun@mvista.com or jsun@junsun.net
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.
12 #include <linux/bcd.h>
13 #include <linux/types.h>
14 #include <linux/time.h>
17 #include <asm/addrspace.h>
20 #include <asm/sibyte/sb1250.h>
21 #include <asm/sibyte/sb1250_regs.h>
22 #include <asm/sibyte/sb1250_smbus.h>
25 /* Xicor 1241 definitions */
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 */
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 */
58 #define X1241_CCR_ADDRESS 0x6F
60 #define SMB_CSR(reg) IOADDR(A_SMB_REGISTER(1, reg))
62 static int xicor_read(uint8_t addr
)
64 while (__raw_readq(SMB_CSR(R_SMB_STATUS
)) & M_SMB_BUSY
)
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
));
72 while (__raw_readq(SMB_CSR(R_SMB_STATUS
)) & M_SMB_BUSY
)
75 __raw_writeq(V_SMB_ADDR(X1241_CCR_ADDRESS
) | V_SMB_TT_RD1BYTE
,
76 SMB_CSR(R_SMB_START
));
78 while (__raw_readq(SMB_CSR(R_SMB_STATUS
)) & M_SMB_BUSY
)
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
));
87 return (__raw_readq(SMB_CSR(R_SMB_DATA
)) & 0xff);
90 static int xicor_write(uint8_t addr
, int b
)
92 while (__raw_readq(SMB_CSR(R_SMB_STATUS
)) & M_SMB_BUSY
)
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
));
100 while (__raw_readq(SMB_CSR(R_SMB_STATUS
)) & M_SMB_BUSY
)
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
));
112 int xicor_set_time(unsigned long t
)
120 spin_lock_irqsave(&rtc_lock
, flags
);
121 /* unlock writes to the CCR */
122 xicor_write(X1241REG_SR
, X1241REG_SR_WEL
);
123 xicor_write(X1241REG_SR
, X1241REG_SR_WEL
| X1241REG_SR_RWEL
);
126 tm
.tm_sec
= BIN2BCD(tm
.tm_sec
);
127 xicor_write(X1241REG_SC
, tm
.tm_sec
);
129 tm
.tm_min
= BIN2BCD(tm
.tm_min
);
130 xicor_write(X1241REG_MN
, tm
.tm_min
);
132 tm
.tm_mday
= BIN2BCD(tm
.tm_mday
);
133 xicor_write(X1241REG_DT
, tm
.tm_mday
);
135 /* tm_mon starts from 0, *ick* */
137 tm
.tm_mon
= BIN2BCD(tm
.tm_mon
);
138 xicor_write(X1241REG_MO
, tm
.tm_mon
);
141 tmp
= tm
.tm_year
/ 100;
143 xicor_write(X1241REG_YR
, tm
.tm_year
);
144 xicor_write(X1241REG_Y2K
, tmp
);
146 /* hour is the most tricky one */
147 tmp
= xicor_read(X1241REG_HR
);
148 if (tmp
& X1241REG_HR_MIL
) {
150 tm
.tm_hour
= BIN2BCD(tm
.tm_hour
);
151 tmp
= (tmp
& ~0x3f) | (tm
.tm_hour
& 0x3f);
153 /* 12 hour format, with 0x2 for pm */
155 if (tm
.tm_hour
>= 12) {
159 tm
.tm_hour
= BIN2BCD(tm
.tm_hour
);
162 xicor_write(X1241REG_HR
, tmp
);
164 xicor_write(X1241REG_SR
, 0);
165 spin_unlock_irqrestore(&rtc_lock
, flags
);
170 unsigned long xicor_get_time(void)
172 unsigned int year
, mon
, day
, hour
, min
, sec
, y2k
;
175 spin_lock_irqsave(&rtc_lock
, flags
);
176 sec
= xicor_read(X1241REG_SC
);
177 min
= xicor_read(X1241REG_MN
);
178 hour
= xicor_read(X1241REG_HR
);
180 if (hour
& X1241REG_HR_MIL
) {
184 hour
= (hour
& 0xf) + 0x12;
187 day
= xicor_read(X1241REG_DT
);
188 mon
= xicor_read(X1241REG_MO
);
189 year
= xicor_read(X1241REG_YR
);
190 y2k
= xicor_read(X1241REG_Y2K
);
191 spin_unlock_irqrestore(&rtc_lock
, flags
);
195 hour
= BCD2BIN(hour
);
198 year
= BCD2BIN(year
);
203 return mktime(year
, mon
, day
, hour
, min
, sec
);
206 int xicor_probe(void)
208 return (xicor_read(X1241REG_SC
) != -1);