/* * Copyright (C) 2000, 2001 Broadcom Corporation * * Copyright (C) 2002 MontaVista Software Inc. * Author: jsun@mvista.com or jsun@junsun.net * * This program is free software; you can redistribute  it and/or modify it * under  the terms of  the GNU General  Public License as published by the * Free Software Foundation;  either version 2 of the  License, or (at your * option) any later version. * */#include <linux/types.h>#include <linux/time.h>#include <asm/time.h>#include <asm/addrspace.h>#include <asm/sibyte/64bit.h>#include <asm/sibyte/sb1250.h>#include <asm/sibyte/sb1250_regs.h>#include <asm/sibyte/sb1250_smbus.h>/* Xicor 1241 definitions *//* * Register bits */#define X1241REG_SR_BAT	0x80		/* currently on battery power */#define X1241REG_SR_RWEL 0x04		/* r/w latch is enabled, can write RTC */#define X1241REG_SR_WEL 0x02		/* r/w latch is unlocked, can enable r/w now */#define X1241REG_SR_RTCF 0x01		/* clock failed */#define X1241REG_BL_BP2 0x80		/* block protect 2 */#define X1241REG_BL_BP1 0x40		/* block protect 1 */#define X1241REG_BL_BP0 0x20		/* block protect 0 */#define X1241REG_BL_WD1	0x10#define X1241REG_BL_WD0	0x08#define X1241REG_HR_MIL 0x80		/* military time format *//* * Register numbers */#define X1241REG_BL	0x10		/* block protect bits */#define X1241REG_INT	0x11		/*  */#define X1241REG_SC	0x30		/* Seconds */#define X1241REG_MN	0x31		/* Minutes */#define X1241REG_HR	0x32		/* Hours */#define X1241REG_DT	0x33		/* Day of month */#define X1241REG_MO	0x34		/* Month */#define X1241REG_YR	0x35		/* Year */#define X1241REG_DW	0x36		/* Day of Week */#define X1241REG_Y2K	0x37		/* Year 2K */#define X1241REG_SR	0x3F		/* Status register */#define X1241_CCR_ADDRESS	0x6F#define SMB_CSR(reg) (KSEG1 | A_SMB_REGISTER(1, reg))static int xicor_read(uint8_t addr){        while (in64(SMB_CSR(R_SMB_STATUS)) & M_SMB_BUSY)                ;	out64((addr >> 8) & 0x7, SMB_CSR(R_SMB_CMD));	out64((addr & 0xff), SMB_CSR(R_SMB_DATA));	out64((V_SMB_ADDR(X1241_CCR_ADDRESS) | V_SMB_TT_WR2BYTE), SMB_CSR(R_SMB_START));        while (in64(SMB_CSR(R_SMB_STATUS)) & M_SMB_BUSY)                ;	out64((V_SMB_ADDR(X1241_CCR_ADDRESS) | V_SMB_TT_RD1BYTE), SMB_CSR(R_SMB_START));        while (in64(SMB_CSR(R_SMB_STATUS)) & M_SMB_BUSY)                ;        if (in64(SMB_CSR(R_SMB_STATUS)) & M_SMB_ERROR) {                /* Clear error bit by writing a 1 */                out64(M_SMB_ERROR, SMB_CSR(R_SMB_STATUS));                return -1;        }	return (in64(SMB_CSR(R_SMB_DATA)) & 0xff);}static int xicor_write(uint8_t addr, int b){        while (in64(SMB_CSR(R_SMB_STATUS)) & M_SMB_BUSY)                ;	out64(addr, SMB_CSR(R_SMB_CMD));	out64((addr & 0xff) | ((b & 0xff) << 8), SMB_CSR(R_SMB_DATA));	out64(V_SMB_ADDR(X1241_CCR_ADDRESS) | V_SMB_TT_WR3BYTE,	      SMB_CSR(R_SMB_START));        while (in64(SMB_CSR(R_SMB_STATUS)) & M_SMB_BUSY)                ;        if (in64(SMB_CSR(R_SMB_STATUS)) & M_SMB_ERROR) {                /* Clear error bit by writing a 1 */                out64(M_SMB_ERROR, SMB_CSR(R_SMB_STATUS));                return -1;        } else {		return 0;	}}#define BCD_TO_BIN(val) ((val)=((val)&15) + ((val)>>4)*10)#define BIN_TO_BCD(val) ((val)=(((val)/10)<<4) + (val)%10)int xicor_set_time(unsigned long t){	struct rtc_time tm;	int tmp;	to_tm(t, &tm);	/* unlock writes to the CCR */	xicor_write(X1241REG_SR, X1241REG_SR_WEL);	xicor_write(X1241REG_SR, X1241REG_SR_WEL | X1241REG_SR_RWEL);	/* trivial ones */	BIN_TO_BCD(tm.tm_sec);	xicor_write(X1241REG_SC, tm.tm_sec);	BIN_TO_BCD(tm.tm_min);	xicor_write(X1241REG_MN, tm.tm_min);	BIN_TO_BCD(tm.tm_mday);	xicor_write(X1241REG_DT, tm.tm_mday);	/* tm_mon starts from 0, *ick* */	tm.tm_mon ++;	BIN_TO_BCD(tm.tm_mon);	xicor_write(X1241REG_MO, tm.tm_mon);	/* year is split */	tmp = tm.tm_year / 100;	tm.tm_year %= 100;	xicor_write(X1241REG_YR, tm.tm_year);	xicor_write(X1241REG_Y2K, tmp);	/* hour is the most tricky one */	tmp = xicor_read(X1241REG_HR);	if (tmp & X1241REG_HR_MIL) {		/* 24 hour format */		BIN_TO_BCD(tm.tm_hour);		tmp = (tmp & ~0x3f) | (tm.tm_hour & 0x3f);	} else {		/* 12 hour format, with 0x2 for pm */		tmp = tmp & ~0x3f;		if (tm.tm_hour >= 12) {			tmp |= 0x20;			tm.tm_hour -= 12;		}		BIN_TO_BCD(tm.tm_hour);		tmp |= tm.tm_hour;	}	xicor_write(X1241REG_HR, tmp);	xicor_write(X1241REG_SR, 0);	return 0;}unsigned long xicor_get_time(void){	unsigned int year, mon, day, hour, min, sec, y2k;	sec = xicor_read(X1241REG_SC);	min = xicor_read(X1241REG_MN);	hour = xicor_read(X1241REG_HR);	if (hour & X1241REG_HR_MIL) {		hour &= 0x3f;	} else {		if (hour & 0x20)			hour = (hour & 0xf) + 0x12;	}	BCD_TO_BIN(sec);	BCD_TO_BIN(min);	BCD_TO_BIN(hour);	day = xicor_read(X1241REG_DT);	mon = xicor_read(X1241REG_MO);	year = xicor_read(X1241REG_YR);	y2k = xicor_read(X1241REG_Y2K);	BCD_TO_BIN(day);	BCD_TO_BIN(mon);	BCD_TO_BIN(year);	BCD_TO_BIN(y2k);	year += (y2k * 100);	return mktime(year, mon, day, hour, min, sec);}