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), SMB_CSR(R_SMB_START));
71 while (__raw_readq(SMB_CSR(R_SMB_STATUS)) & M_SMB_BUSY)
74 __raw_writeq((V_SMB_ADDR(X1241_CCR_ADDRESS) | V_SMB_TT_RD1BYTE), SMB_CSR(R_SMB_START));
76 while (__raw_readq(SMB_CSR(R_SMB_STATUS)) & M_SMB_BUSY)
79 if (__raw_readq(SMB_CSR(R_SMB_STATUS)) & M_SMB_ERROR) {
80 /* Clear error bit by writing a 1 */
81 __raw_writeq(M_SMB_ERROR, SMB_CSR(R_SMB_STATUS));
85 return (__raw_readq(SMB_CSR(R_SMB_DATA)) & 0xff);
88 static int xicor_write(uint8_t addr, int b)
90 while (__raw_readq(SMB_CSR(R_SMB_STATUS)) & M_SMB_BUSY)
93 __raw_writeq(addr, SMB_CSR(R_SMB_CMD));
94 __raw_writeq((addr & 0xff) | ((b & 0xff) << 8), SMB_CSR(R_SMB_DATA));
95 __raw_writeq(V_SMB_ADDR(X1241_CCR_ADDRESS) | V_SMB_TT_WR3BYTE,
96 SMB_CSR(R_SMB_START));
98 while (__raw_readq(SMB_CSR(R_SMB_STATUS)) & M_SMB_BUSY)
101 if (__raw_readq(SMB_CSR(R_SMB_STATUS)) & M_SMB_ERROR) {
102 /* Clear error bit by writing a 1 */
103 __raw_writeq(M_SMB_ERROR, SMB_CSR(R_SMB_STATUS));
110 int xicor_set_time(unsigned long t)
117 /* unlock writes to the CCR */
118 xicor_write(X1241REG_SR, X1241REG_SR_WEL);
119 xicor_write(X1241REG_SR, X1241REG_SR_WEL | X1241REG_SR_RWEL);
122 tm.tm_sec = BIN2BCD(tm.tm_sec);
123 xicor_write(X1241REG_SC, tm.tm_sec);
125 tm.tm_min = BIN2BCD(tm.tm_min);
126 xicor_write(X1241REG_MN, tm.tm_min);
128 tm.tm_mday = BIN2BCD(tm.tm_mday);
129 xicor_write(X1241REG_DT, tm.tm_mday);
131 /* tm_mon starts from 0, *ick* */
133 tm.tm_mon = BIN2BCD(tm.tm_mon);
134 xicor_write(X1241REG_MO, tm.tm_mon);
137 tmp = tm.tm_year / 100;
139 xicor_write(X1241REG_YR, tm.tm_year);
140 xicor_write(X1241REG_Y2K, tmp);
142 /* hour is the most tricky one */
143 tmp = xicor_read(X1241REG_HR);
144 if (tmp & X1241REG_HR_MIL) {
146 tm.tm_hour = BIN2BCD(tm.tm_hour);
147 tmp = (tmp & ~0x3f) | (tm.tm_hour & 0x3f);
149 /* 12 hour format, with 0x2 for pm */
151 if (tm.tm_hour >= 12) {
155 tm.tm_hour = BIN2BCD(tm.tm_hour);
158 xicor_write(X1241REG_HR, tmp);
160 xicor_write(X1241REG_SR, 0);
165 unsigned long xicor_get_time(void)
167 unsigned int year, mon, day, hour, min, sec, y2k;
169 sec = xicor_read(X1241REG_SC);
170 min = xicor_read(X1241REG_MN);
171 hour = xicor_read(X1241REG_HR);
173 if (hour & X1241REG_HR_MIL) {
177 hour = (hour & 0xf) + 0x12;
180 day = xicor_read(X1241REG_DT);
181 mon = xicor_read(X1241REG_MO);
182 year = xicor_read(X1241REG_YR);
183 y2k = xicor_read(X1241REG_Y2K);
187 hour = BCD2BIN(hour);
190 year = BCD2BIN(year);
195 return mktime(year, mon, day, hour, min, sec);
198 int xicor_probe(void)
200 return (xicor_read(X1241REG_SC) != -1);