204 строки
5.1 KiB
C
204 строки
5.1 KiB
C
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/*
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* Copyright (C) 2000, 2001 Broadcom Corporation
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*
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* Copyright (C) 2002 MontaVista Software Inc.
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* Author: jsun@mvista.com or jsun@junsun.net
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/bcd.h>
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#include <linux/types.h>
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#include <linux/time.h>
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#include <asm/time.h>
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#include <asm/addrspace.h>
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#include <asm/io.h>
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#include <asm/sibyte/sb1250.h>
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#include <asm/sibyte/sb1250_regs.h>
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#include <asm/sibyte/sb1250_smbus.h>
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/* Xicor 1241 definitions */
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/*
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* Register bits
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*/
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#define X1241REG_SR_BAT 0x80 /* currently on battery power */
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#define X1241REG_SR_RWEL 0x04 /* r/w latch is enabled, can write RTC */
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#define X1241REG_SR_WEL 0x02 /* r/w latch is unlocked, can enable r/w now */
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#define X1241REG_SR_RTCF 0x01 /* clock failed */
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#define X1241REG_BL_BP2 0x80 /* block protect 2 */
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#define X1241REG_BL_BP1 0x40 /* block protect 1 */
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#define X1241REG_BL_BP0 0x20 /* block protect 0 */
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#define X1241REG_BL_WD1 0x10
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#define X1241REG_BL_WD0 0x08
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#define X1241REG_HR_MIL 0x80 /* military time format */
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/*
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* Register numbers
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*/
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#define X1241REG_BL 0x10 /* block protect bits */
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#define X1241REG_INT 0x11 /* */
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#define X1241REG_SC 0x30 /* Seconds */
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#define X1241REG_MN 0x31 /* Minutes */
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#define X1241REG_HR 0x32 /* Hours */
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#define X1241REG_DT 0x33 /* Day of month */
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#define X1241REG_MO 0x34 /* Month */
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#define X1241REG_YR 0x35 /* Year */
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#define X1241REG_DW 0x36 /* Day of Week */
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#define X1241REG_Y2K 0x37 /* Year 2K */
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#define X1241REG_SR 0x3F /* Status register */
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#define X1241_CCR_ADDRESS 0x6F
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#define SMB_CSR(reg) ((u8 *) (IOADDR(A_SMB_REGISTER(1, reg))))
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static int xicor_read(uint8_t addr)
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{
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while (bus_readq(SMB_CSR(R_SMB_STATUS)) & M_SMB_BUSY)
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;
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bus_writeq((addr >> 8) & 0x7, SMB_CSR(R_SMB_CMD));
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bus_writeq((addr & 0xff), SMB_CSR(R_SMB_DATA));
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bus_writeq((V_SMB_ADDR(X1241_CCR_ADDRESS) | V_SMB_TT_WR2BYTE),
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SMB_CSR(R_SMB_START));
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while (bus_readq(SMB_CSR(R_SMB_STATUS)) & M_SMB_BUSY)
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;
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bus_writeq((V_SMB_ADDR(X1241_CCR_ADDRESS) | V_SMB_TT_RD1BYTE),
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SMB_CSR(R_SMB_START));
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while (bus_readq(SMB_CSR(R_SMB_STATUS)) & M_SMB_BUSY)
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;
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if (bus_readq(SMB_CSR(R_SMB_STATUS)) & M_SMB_ERROR) {
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/* Clear error bit by writing a 1 */
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bus_writeq(M_SMB_ERROR, SMB_CSR(R_SMB_STATUS));
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return -1;
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}
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return (bus_readq(SMB_CSR(R_SMB_DATA)) & 0xff);
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}
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static int xicor_write(uint8_t addr, int b)
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{
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while (bus_readq(SMB_CSR(R_SMB_STATUS)) & M_SMB_BUSY)
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;
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bus_writeq(addr, SMB_CSR(R_SMB_CMD));
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bus_writeq((addr & 0xff) | ((b & 0xff) << 8), SMB_CSR(R_SMB_DATA));
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bus_writeq(V_SMB_ADDR(X1241_CCR_ADDRESS) | V_SMB_TT_WR3BYTE,
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SMB_CSR(R_SMB_START));
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while (bus_readq(SMB_CSR(R_SMB_STATUS)) & M_SMB_BUSY)
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;
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if (bus_readq(SMB_CSR(R_SMB_STATUS)) & M_SMB_ERROR) {
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/* Clear error bit by writing a 1 */
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bus_writeq(M_SMB_ERROR, SMB_CSR(R_SMB_STATUS));
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return -1;
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} else {
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return 0;
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}
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}
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int xicor_set_time(unsigned long t)
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{
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struct rtc_time tm;
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int tmp;
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to_tm(t, &tm);
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/* unlock writes to the CCR */
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xicor_write(X1241REG_SR, X1241REG_SR_WEL);
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xicor_write(X1241REG_SR, X1241REG_SR_WEL | X1241REG_SR_RWEL);
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/* trivial ones */
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tm.tm_sec = BIN2BCD(tm.tm_sec);
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xicor_write(X1241REG_SC, tm.tm_sec);
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tm.tm_min = BIN2BCD(tm.tm_min);
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xicor_write(X1241REG_MN, tm.tm_min);
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tm.tm_mday = BIN2BCD(tm.tm_mday);
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xicor_write(X1241REG_DT, tm.tm_mday);
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/* tm_mon starts from 0, *ick* */
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tm.tm_mon ++;
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tm.tm_mon = BIN2BCD(tm.tm_mon);
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xicor_write(X1241REG_MO, tm.tm_mon);
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/* year is split */
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tmp = tm.tm_year / 100;
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tm.tm_year %= 100;
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xicor_write(X1241REG_YR, tm.tm_year);
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xicor_write(X1241REG_Y2K, tmp);
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/* hour is the most tricky one */
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tmp = xicor_read(X1241REG_HR);
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if (tmp & X1241REG_HR_MIL) {
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/* 24 hour format */
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tm.tm_hour = BIN2BCD(tm.tm_hour);
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tmp = (tmp & ~0x3f) | (tm.tm_hour & 0x3f);
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} else {
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/* 12 hour format, with 0x2 for pm */
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tmp = tmp & ~0x3f;
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if (tm.tm_hour >= 12) {
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tmp |= 0x20;
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tm.tm_hour -= 12;
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}
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tm.tm_hour = BIN2BCD(tm.tm_hour);
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tmp |= tm.tm_hour;
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}
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xicor_write(X1241REG_HR, tmp);
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xicor_write(X1241REG_SR, 0);
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return 0;
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}
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unsigned long xicor_get_time(void)
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{
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unsigned int year, mon, day, hour, min, sec, y2k;
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sec = xicor_read(X1241REG_SC);
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min = xicor_read(X1241REG_MN);
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hour = xicor_read(X1241REG_HR);
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if (hour & X1241REG_HR_MIL) {
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hour &= 0x3f;
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} else {
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if (hour & 0x20)
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hour = (hour & 0xf) + 0x12;
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}
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day = xicor_read(X1241REG_DT);
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mon = xicor_read(X1241REG_MO);
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year = xicor_read(X1241REG_YR);
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y2k = xicor_read(X1241REG_Y2K);
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sec = BCD2BIN(sec);
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min = BCD2BIN(min);
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hour = BCD2BIN(hour);
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day = BCD2BIN(day);
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mon = BCD2BIN(mon);
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year = BCD2BIN(year);
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y2k = BCD2BIN(y2k);
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year += (y2k * 100);
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return mktime(year, mon, day, hour, min, sec);
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}
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int xicor_probe(void)
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{
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return (xicor_read(X1241REG_SC) != -1);
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}
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