fixup sibyte rtc support

SVN-Revision: 16094

2 files changed, 898 insertions, 0 deletions

diff --git a/target/linux/sibyte/patches/003-m41t80_smbus.patch b/target/linux/sibyte/patches/003-m41t80_smbus.patch
new file mode 100644
index 0000000000..c6a07c6d5b
--- /dev/null
+++ b/target/linux/sibyte/patches/003-m41t80_smbus.patch
@@ -0,0 +1,367 @@
+--- a/drivers/rtc/rtc-m41t80.c
++++ b/drivers/rtc/rtc-m41t80.c
+@@ -6,6 +6,7 @@
+  * Based on m41t00.c by Mark A. Greer <mgreer@mvista.com>
+  *
+  * 2006 (c) mycable GmbH
++ * Copyright (c) 2008  Maciej W. Rozycki
+  *
+  * This program is free software; you can redistribute it and/or modify
+  * it under the terms of the GNU General Public License version 2 as
+@@ -38,6 +39,8 @@
+ #define M41T80_REG_DAY	5
+ #define M41T80_REG_MON	6
+ #define M41T80_REG_YEAR	7
++#define M41T80_REG_CONTROL	8
++#define M41T80_REG_WATCHDOG	9
+ #define M41T80_REG_ALARM_MON	0xa
+ #define M41T80_REG_ALARM_DAY	0xb
+ #define M41T80_REG_ALARM_HOUR	0xc
+@@ -66,7 +69,7 @@
+ #define M41T80_FEATURE_WD	(1 << 3)	/* Extra watchdog resolution */
+ #define M41T80_FEATURE_SQ_ALT	(1 << 4)	/* RSx bits are in reg 4 */
+ 
+-#define DRV_VERSION "0.05"
++#define DRV_VERSION "0.06"
+ 
+ static const struct i2c_device_id m41t80_id[] = {
+ 	{ "m41t62", M41T80_FEATURE_SQ | M41T80_FEATURE_SQ_ALT },
+@@ -88,31 +91,88 @@ struct m41t80_data {
+ 	struct rtc_device *rtc;
+ };
+ 
+-static int m41t80_get_datetime(struct i2c_client *client,
+-			       struct rtc_time *tm)
++
++static int m41t80_write_block_data(struct i2c_client *client,
++				   u8 reg, u8 num, u8 *buf)
+ {
+-	u8 buf[M41T80_DATETIME_REG_SIZE], dt_addr[1] = { M41T80_REG_SEC };
+-	struct i2c_msg msgs[] = {
+-		{
+-			.addr	= client->addr,
+-			.flags	= 0,
+-			.len	= 1,
+-			.buf	= dt_addr,
+-		},
+-		{
+-			.addr	= client->addr,
+-			.flags	= I2C_M_RD,
+-			.len	= M41T80_DATETIME_REG_SIZE - M41T80_REG_SEC,
+-			.buf	= buf + M41T80_REG_SEC,
+-		},
+-	};
++	int i, rc;
+ 
+-	if (i2c_transfer(client->adapter, msgs, 2) < 0) {
+-		dev_err(&client->dev, "read error\n");
+-		return -EIO;
++	if (i2c_check_functionality(client->adapter,
++				    I2C_FUNC_SMBUS_WRITE_I2C_BLOCK)) {
++		i = i2c_smbus_write_i2c_block_data(client, reg, num, buf);
++	} else {
++		for (i = 0; i < num; i++) {
++			rc = i2c_smbus_write_byte_data(client, reg + i,
++						       buf[i]);
++			if (rc < 0) {
++				i = rc;
++				goto out;
++			}
++		}
+ 	}
++out:
++	return i;
++}
++
++static int m41t80_read_block_data(struct i2c_client *client,
++				  u8 reg, u8 num, u8 *buf)
++{
++	int i, rc;
++
++	if (i2c_check_functionality(client->adapter,
++				    I2C_FUNC_SMBUS_READ_I2C_BLOCK)) {
++		i = i2c_smbus_read_i2c_block_data(client, reg, num, buf);
++	} else {
++		for (i = 0; i < num; i++) {
++			rc = i2c_smbus_read_byte_data(client, reg + i);
++			if (rc < 0) {
++				i = rc;
++				goto out;
++			}
++			buf[i] = rc;
++		}
++	}
++out:
++	return i;
++}
++
++static int m41t80_get_datetime(struct i2c_client *client, struct rtc_time *tm)
++{
++	u8 buf[M41T80_DATETIME_REG_SIZE];
++	int loops = 2;
++	int sec0, sec1;
++
++	/*
++	 * Time registers are latched by this chip if an I2C block
++	 * transfer is used, but with SMBus-style byte accesses
++	 * this is not the case, so check seconds for a wraparound.
++	 */
++	do {
++		if (m41t80_read_block_data(client, M41T80_REG_SEC,
++					   M41T80_DATETIME_REG_SIZE -
++					   M41T80_REG_SEC,
++					   buf + M41T80_REG_SEC) < 0) {
++			dev_err(&client->dev, "read error\n");
++			return -EIO;
++		}
++		if (i2c_check_functionality(client->adapter,
++					    I2C_FUNC_SMBUS_READ_I2C_BLOCK)) {
++			sec1 = buf[M41T80_REG_SEC];
++			break;
++		}
++
++		sec0 = buf[M41T80_REG_SEC];
++		sec1 = i2c_smbus_read_byte_data(client, M41T80_REG_SEC);
++		if (sec1 < 0) {
++			dev_err(&client->dev, "read error\n");
++			return -EIO;
++		}
++
++		sec0 = bcd2bin(sec0 & 0x7f);
++		sec1 = bcd2bin(sec1 & 0x7f);
++	} while (sec1 < sec0 && --loops);
+ 
+-	tm->tm_sec = bcd2bin(buf[M41T80_REG_SEC] & 0x7f);
++	tm->tm_sec = sec1;
+ 	tm->tm_min = bcd2bin(buf[M41T80_REG_MIN] & 0x7f);
+ 	tm->tm_hour = bcd2bin(buf[M41T80_REG_HOUR] & 0x3f);
+ 	tm->tm_mday = bcd2bin(buf[M41T80_REG_DAY] & 0x3f);
+@@ -127,39 +187,16 @@ static int m41t80_get_datetime(struct i2
+ /* Sets the given date and time to the real time clock. */
+ static int m41t80_set_datetime(struct i2c_client *client, struct rtc_time *tm)
+ {
+-	u8 wbuf[1 + M41T80_DATETIME_REG_SIZE];
+-	u8 *buf = &wbuf[1];
+-	u8 dt_addr[1] = { M41T80_REG_SEC };
+-	struct i2c_msg msgs_in[] = {
+-		{
+-			.addr	= client->addr,
+-			.flags	= 0,
+-			.len	= 1,
+-			.buf	= dt_addr,
+-		},
+-		{
+-			.addr	= client->addr,
+-			.flags	= I2C_M_RD,
+-			.len	= M41T80_DATETIME_REG_SIZE - M41T80_REG_SEC,
+-			.buf	= buf + M41T80_REG_SEC,
+-		},
+-	};
+-	struct i2c_msg msgs[] = {
+-		{
+-			.addr	= client->addr,
+-			.flags	= 0,
+-			.len	= 1 + M41T80_DATETIME_REG_SIZE,
+-			.buf	= wbuf,
+-		 },
+-	};
++	u8 buf[M41T80_DATETIME_REG_SIZE];
+ 
+ 	/* Read current reg values into buf[1..7] */
+-	if (i2c_transfer(client->adapter, msgs_in, 2) < 0) {
++	if (m41t80_read_block_data(client, M41T80_REG_SEC,
++				   M41T80_DATETIME_REG_SIZE - M41T80_REG_SEC,
++				   buf + M41T80_REG_SEC) < 0) {
+ 		dev_err(&client->dev, "read error\n");
+ 		return -EIO;
+ 	}
+ 
+-	wbuf[0] = 0; /* offset into rtc's regs */
+ 	/* Merge time-data and register flags into buf[0..7] */
+ 	buf[M41T80_REG_SSEC] = 0;
+ 	buf[M41T80_REG_SEC] =
+@@ -177,7 +214,8 @@ static int m41t80_set_datetime(struct i2
+ 	/* assume 20YY not 19YY */
+ 	buf[M41T80_REG_YEAR] = bin2bcd(tm->tm_year % 100);
+ 
+-	if (i2c_transfer(client->adapter, msgs, 1) != 1) {
++	if (m41t80_write_block_data(client, M41T80_REG_SSEC,
++				    M41T80_DATETIME_REG_SIZE, buf) < 0) {
+ 		dev_err(&client->dev, "write error\n");
+ 		return -EIO;
+ 	}
+@@ -251,34 +289,11 @@ err:
+ static int m41t80_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *t)
+ {
+ 	struct i2c_client *client = to_i2c_client(dev);
+-	u8 wbuf[1 + M41T80_ALARM_REG_SIZE];
+-	u8 *buf = &wbuf[1];
++	u8 buf[M41T80_ALARM_REG_SIZE];
+ 	u8 *reg = buf - M41T80_REG_ALARM_MON;
+-	u8 dt_addr[1] = { M41T80_REG_ALARM_MON };
+-	struct i2c_msg msgs_in[] = {
+-		{
+-			.addr	= client->addr,
+-			.flags	= 0,
+-			.len	= 1,
+-			.buf	= dt_addr,
+-		},
+-		{
+-			.addr	= client->addr,
+-			.flags	= I2C_M_RD,
+-			.len	= M41T80_ALARM_REG_SIZE,
+-			.buf	= buf,
+-		},
+-	};
+-	struct i2c_msg msgs[] = {
+-		{
+-			.addr	= client->addr,
+-			.flags	= 0,
+-			.len	= 1 + M41T80_ALARM_REG_SIZE,
+-			.buf	= wbuf,
+-		 },
+-	};
+ 
+-	if (i2c_transfer(client->adapter, msgs_in, 2) < 0) {
++	if (m41t80_read_block_data(client, M41T80_REG_ALARM_MON,
++				   M41T80_ALARM_REG_SIZE, buf) < 0) {
+ 		dev_err(&client->dev, "read error\n");
+ 		return -EIO;
+ 	}
+@@ -288,7 +303,6 @@ static int m41t80_rtc_set_alarm(struct d
+ 	reg[M41T80_REG_ALARM_MIN] = 0;
+ 	reg[M41T80_REG_ALARM_SEC] = 0;
+ 
+-	wbuf[0] = M41T80_REG_ALARM_MON; /* offset into rtc's regs */
+ 	reg[M41T80_REG_ALARM_SEC] |= t->time.tm_sec >= 0 ?
+ 		bin2bcd(t->time.tm_sec) : 0x80;
+ 	reg[M41T80_REG_ALARM_MIN] |= t->time.tm_min >= 0 ?
+@@ -302,7 +316,8 @@ static int m41t80_rtc_set_alarm(struct d
+ 	else
+ 		reg[M41T80_REG_ALARM_DAY] |= 0x40;
+ 
+-	if (i2c_transfer(client->adapter, msgs, 1) != 1) {
++	if (m41t80_write_block_data(client, M41T80_REG_ALARM_MON,
++				    M41T80_ALARM_REG_SIZE, buf) < 0) {
+ 		dev_err(&client->dev, "write error\n");
+ 		return -EIO;
+ 	}
+@@ -322,24 +337,10 @@ static int m41t80_rtc_read_alarm(struct 
+ {
+ 	struct i2c_client *client = to_i2c_client(dev);
+ 	u8 buf[M41T80_ALARM_REG_SIZE + 1]; /* all alarm regs and flags */
+-	u8 dt_addr[1] = { M41T80_REG_ALARM_MON };
+ 	u8 *reg = buf - M41T80_REG_ALARM_MON;
+-	struct i2c_msg msgs[] = {
+-		{
+-			.addr	= client->addr,
+-			.flags	= 0,
+-			.len	= 1,
+-			.buf	= dt_addr,
+-		},
+-		{
+-			.addr	= client->addr,
+-			.flags	= I2C_M_RD,
+-			.len	= M41T80_ALARM_REG_SIZE + 1,
+-			.buf	= buf,
+-		},
+-	};
+ 
+-	if (i2c_transfer(client->adapter, msgs, 2) < 0) {
++	if (m41t80_read_block_data(client, M41T80_REG_ALARM_MON,
++				   M41T80_ALARM_REG_SIZE + 1, buf) < 0) {
+ 		dev_err(&client->dev, "read error\n");
+ 		return -EIO;
+ 	}
+@@ -512,26 +513,16 @@ static int boot_flag;
+  */
+ static void wdt_ping(void)
+ {
+-	unsigned char i2c_data[2];
+-	struct i2c_msg msgs1[1] = {
+-		{
+-			.addr	= save_client->addr,
+-			.flags	= 0,
+-			.len	= 2,
+-			.buf	= i2c_data,
+-		},
+-	};
+-	struct m41t80_data *clientdata = i2c_get_clientdata(save_client);
++	u8 wdt = 0x80;				/* WDS = 1 (0x80)  */
+ 
+-	i2c_data[0] = 0x09;		/* watchdog register */
++	struct m41t80_data *clientdata = i2c_get_clientdata(save_client);
+ 
+ 	if (wdt_margin > 31)
+-		i2c_data[1] = (wdt_margin & 0xFC) | 0x83; /* resolution = 4s */
++		/* mulitplier = WD_TIMO / 4, resolution = 4s (0x3)  */
++		wdt |= (wdt_margin & 0xfc) | 0x3;
+ 	else
+-		/*
+-		 * WDS = 1 (0x80), mulitplier = WD_TIMO, resolution = 1s (0x02)
+-		 */
+-		i2c_data[1] = wdt_margin<<2 | 0x82;
++		/* mulitplier = WD_TIMO, resolution = 1s (0x2)  */
++		wdt |= wdt_margin << 2 | 0x2;
+ 
+ 	/*
+ 	 * M41T65 has three bits for watchdog resolution.  Don't set bit 7, as
+@@ -540,7 +531,7 @@ static void wdt_ping(void)
+ 	if (clientdata->features & M41T80_FEATURE_WD)
+ 		i2c_data[1] &= ~M41T80_WATCHDOG_RB2;
+ 
+-	i2c_transfer(save_client->adapter, msgs1, 1);
++	i2c_smbus_write_byte_data(save_client, M41T80_REG_WATCHDOG, wdt);
+ }
+ 
+ /**
+@@ -550,36 +541,8 @@ static void wdt_ping(void)
+  */
+ static void wdt_disable(void)
+ {
+-	unsigned char i2c_data[2], i2c_buf[0x10];
+-	struct i2c_msg msgs0[2] = {
+-		{
+-			.addr	= save_client->addr,
+-			.flags	= 0,
+-			.len	= 1,
+-			.buf	= i2c_data,
+-		},
+-		{
+-			.addr	= save_client->addr,
+-			.flags	= I2C_M_RD,
+-			.len	= 1,
+-			.buf	= i2c_buf,
+-		},
+-	};
+-	struct i2c_msg msgs1[1] = {
+-		{
+-			.addr	= save_client->addr,
+-			.flags	= 0,
+-			.len	= 2,
+-			.buf	= i2c_data,
+-		},
+-	};
+-
+-	i2c_data[0] = 0x09;
+-	i2c_transfer(save_client->adapter, msgs0, 2);
+-
+-	i2c_data[0] = 0x09;
+-	i2c_data[1] = 0x00;
+-	i2c_transfer(save_client->adapter, msgs1, 1);
++	i2c_smbus_read_byte_data(save_client, M41T80_REG_WATCHDOG);
++	i2c_smbus_write_byte_data(save_client, M41T80_REG_WATCHDOG, 0);
+ }
+ 
+ /**
+@@ -772,8 +735,8 @@ static int m41t80_probe(struct i2c_clien
+ 	struct rtc_time tm;
+ 	struct m41t80_data *clientdata = NULL;
+ 
+-	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C
+-				     | I2C_FUNC_SMBUS_BYTE_DATA)) {
++	if (!i2c_check_functionality(client->adapter,
++				     I2C_FUNC_SMBUS_BYTE_DATA)) {
+ 		rc = -ENODEV;
+ 		goto exit;
+ 	}
diff --git a/target/linux/sibyte/patches/004-sibyte_rtc_cleanup.patch b/target/linux/sibyte/patches/004-sibyte_rtc_cleanup.patch
new file mode 100644
index 0000000000..ca755f3e28
--- /dev/null
+++ b/target/linux/sibyte/patches/004-sibyte_rtc_cleanup.patch
@@ -0,0 +1,531 @@
+--- a/arch/mips/sibyte/swarm/Makefile
++++ b/arch/mips/sibyte/swarm/Makefile
+@@ -1,4 +1,3 @@
+-obj-y				:= platform.o setup.o rtc_xicor1241.o \
+-				   rtc_m41t81.o
++obj-y				:= platform.o setup.o
+ 
+ obj-$(CONFIG_I2C_BOARDINFO)	+= swarm-i2c.o
+--- a/arch/mips/sibyte/swarm/rtc_m41t81.c
++++ /dev/null
+@@ -1,233 +0,0 @@
+-/*
+- * 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/bcd.h>
+-#include <linux/types.h>
+-#include <linux/time.h>
+-
+-#include <asm/time.h>
+-#include <asm/addrspace.h>
+-#include <asm/io.h>
+-
+-#include <asm/sibyte/sb1250.h>
+-#include <asm/sibyte/sb1250_regs.h>
+-#include <asm/sibyte/sb1250_smbus.h>
+-
+-
+-/* M41T81 definitions */
+-
+-/*
+- * Register bits
+- */
+-
+-#define M41T81REG_SC_ST		0x80		/* stop bit */
+-#define M41T81REG_HR_CB		0x40		/* century bit */
+-#define M41T81REG_HR_CEB	0x80		/* century enable bit */
+-#define M41T81REG_CTL_S		0x20		/* sign bit */
+-#define M41T81REG_CTL_FT	0x40		/* frequency test bit */
+-#define M41T81REG_CTL_OUT	0x80		/* output level */
+-#define M41T81REG_WD_RB0	0x01		/* watchdog resolution bit 0 */
+-#define M41T81REG_WD_RB1	0x02		/* watchdog resolution bit 1 */
+-#define M41T81REG_WD_BMB0	0x04		/* watchdog multiplier bit 0 */
+-#define M41T81REG_WD_BMB1	0x08		/* watchdog multiplier bit 1 */
+-#define M41T81REG_WD_BMB2	0x10		/* watchdog multiplier bit 2 */
+-#define M41T81REG_WD_BMB3	0x20		/* watchdog multiplier bit 3 */
+-#define M41T81REG_WD_BMB4	0x40		/* watchdog multiplier bit 4 */
+-#define M41T81REG_AMO_ABE	0x20		/* alarm in "battery back-up mode" enable bit */
+-#define M41T81REG_AMO_SQWE	0x40		/* square wave enable */
+-#define M41T81REG_AMO_AFE	0x80		/* alarm flag enable flag */
+-#define M41T81REG_ADT_RPT5	0x40		/* alarm repeat mode bit 5 */
+-#define M41T81REG_ADT_RPT4	0x80		/* alarm repeat mode bit 4 */
+-#define M41T81REG_AHR_RPT3	0x80		/* alarm repeat mode bit 3 */
+-#define M41T81REG_AHR_HT	0x40		/* halt update bit */
+-#define M41T81REG_AMN_RPT2	0x80		/* alarm repeat mode bit 2 */
+-#define M41T81REG_ASC_RPT1	0x80		/* alarm repeat mode bit 1 */
+-#define M41T81REG_FLG_AF	0x40		/* alarm flag (read only) */
+-#define M41T81REG_FLG_WDF	0x80		/* watchdog flag (read only) */
+-#define M41T81REG_SQW_RS0	0x10		/* sqw frequency bit 0 */
+-#define M41T81REG_SQW_RS1	0x20		/* sqw frequency bit 1 */
+-#define M41T81REG_SQW_RS2	0x40		/* sqw frequency bit 2 */
+-#define M41T81REG_SQW_RS3	0x80		/* sqw frequency bit 3 */
+-
+-
+-/*
+- * Register numbers
+- */
+-
+-#define M41T81REG_TSC	0x00		/* tenths/hundredths of second */
+-#define M41T81REG_SC	0x01		/* seconds */
+-#define M41T81REG_MN	0x02		/* minute */
+-#define M41T81REG_HR	0x03		/* hour/century */
+-#define M41T81REG_DY	0x04		/* day of week */
+-#define M41T81REG_DT	0x05		/* date of month */
+-#define M41T81REG_MO	0x06		/* month */
+-#define M41T81REG_YR	0x07		/* year */
+-#define M41T81REG_CTL	0x08		/* control */
+-#define M41T81REG_WD	0x09		/* watchdog */
+-#define M41T81REG_AMO	0x0A		/* alarm: month */
+-#define M41T81REG_ADT	0x0B		/* alarm: date */
+-#define M41T81REG_AHR	0x0C		/* alarm: hour */
+-#define M41T81REG_AMN	0x0D		/* alarm: minute */
+-#define M41T81REG_ASC	0x0E		/* alarm: second */
+-#define M41T81REG_FLG	0x0F		/* flags */
+-#define M41T81REG_SQW	0x13		/* square wave register */
+-
+-#define M41T81_CCR_ADDRESS	0x68
+-
+-#define SMB_CSR(reg)	IOADDR(A_SMB_REGISTER(1, reg))
+-
+-static int m41t81_read(uint8_t addr)
+-{
+-	while (__raw_readq(SMB_CSR(R_SMB_STATUS)) & M_SMB_BUSY)
+-		;
+-
+-	__raw_writeq(addr & 0xff, SMB_CSR(R_SMB_CMD));
+-	__raw_writeq(V_SMB_ADDR(M41T81_CCR_ADDRESS) | V_SMB_TT_WR1BYTE,
+-		     SMB_CSR(R_SMB_START));
+-
+-	while (__raw_readq(SMB_CSR(R_SMB_STATUS)) & M_SMB_BUSY)
+-		;
+-
+-	__raw_writeq(V_SMB_ADDR(M41T81_CCR_ADDRESS) | V_SMB_TT_RD1BYTE,
+-		     SMB_CSR(R_SMB_START));
+-
+-	while (__raw_readq(SMB_CSR(R_SMB_STATUS)) & M_SMB_BUSY)
+-		;
+-
+-	if (__raw_readq(SMB_CSR(R_SMB_STATUS)) & M_SMB_ERROR) {
+-		/* Clear error bit by writing a 1 */
+-		__raw_writeq(M_SMB_ERROR, SMB_CSR(R_SMB_STATUS));
+-		return -1;
+-	}
+-
+-	return (__raw_readq(SMB_CSR(R_SMB_DATA)) & 0xff);
+-}
+-
+-static int m41t81_write(uint8_t addr, int b)
+-{
+-	while (__raw_readq(SMB_CSR(R_SMB_STATUS)) & M_SMB_BUSY)
+-		;
+-
+-	__raw_writeq(addr & 0xff, SMB_CSR(R_SMB_CMD));
+-	__raw_writeq(b & 0xff, SMB_CSR(R_SMB_DATA));
+-	__raw_writeq(V_SMB_ADDR(M41T81_CCR_ADDRESS) | V_SMB_TT_WR2BYTE,
+-		     SMB_CSR(R_SMB_START));
+-
+-	while (__raw_readq(SMB_CSR(R_SMB_STATUS)) & M_SMB_BUSY)
+-		;
+-
+-	if (__raw_readq(SMB_CSR(R_SMB_STATUS)) & M_SMB_ERROR) {
+-		/* Clear error bit by writing a 1 */
+-		__raw_writeq(M_SMB_ERROR, SMB_CSR(R_SMB_STATUS));
+-		return -1;
+-	}
+-
+-	/* read the same byte again to make sure it is written */
+-	__raw_writeq(V_SMB_ADDR(M41T81_CCR_ADDRESS) | V_SMB_TT_RD1BYTE,
+-		     SMB_CSR(R_SMB_START));
+-
+-	while (__raw_readq(SMB_CSR(R_SMB_STATUS)) & M_SMB_BUSY)
+-		;
+-
+-	return 0;
+-}
+-
+-int m41t81_set_time(unsigned long t)
+-{
+-	struct rtc_time tm;
+-	unsigned long flags;
+-
+-	/* Note we don't care about the century */
+-	rtc_time_to_tm(t, &tm);
+-
+-	/*
+-	 * Note the write order matters as it ensures the correctness.
+-	 * When we write sec, 10th sec is clear.  It is reasonable to
+-	 * believe we should finish writing min within a second.
+-	 */
+-
+-	spin_lock_irqsave(&rtc_lock, flags);
+-	tm.tm_sec = bin2bcd(tm.tm_sec);
+-	m41t81_write(M41T81REG_SC, tm.tm_sec);
+-
+-	tm.tm_min = bin2bcd(tm.tm_min);
+-	m41t81_write(M41T81REG_MN, tm.tm_min);
+-
+-	tm.tm_hour = bin2bcd(tm.tm_hour);
+-	tm.tm_hour = (tm.tm_hour & 0x3f) | (m41t81_read(M41T81REG_HR) & 0xc0);
+-	m41t81_write(M41T81REG_HR, tm.tm_hour);
+-
+-	/* tm_wday starts from 0 to 6 */
+-	if (tm.tm_wday == 0) tm.tm_wday = 7;
+-	tm.tm_wday = bin2bcd(tm.tm_wday);
+-	m41t81_write(M41T81REG_DY, tm.tm_wday);
+-
+-	tm.tm_mday = bin2bcd(tm.tm_mday);
+-	m41t81_write(M41T81REG_DT, tm.tm_mday);
+-
+-	/* tm_mon starts from 0, *ick* */
+-	tm.tm_mon ++;
+-	tm.tm_mon = bin2bcd(tm.tm_mon);
+-	m41t81_write(M41T81REG_MO, tm.tm_mon);
+-
+-	/* we don't do century, everything is beyond 2000 */
+-	tm.tm_year %= 100;
+-	tm.tm_year = bin2bcd(tm.tm_year);
+-	m41t81_write(M41T81REG_YR, tm.tm_year);
+-	spin_unlock_irqrestore(&rtc_lock, flags);
+-
+-	return 0;
+-}
+-
+-unsigned long m41t81_get_time(void)
+-{
+-	unsigned int year, mon, day, hour, min, sec;
+-	unsigned long flags;
+-
+-	/*
+-	 * min is valid if two reads of sec are the same.
+-	 */
+-	for (;;) {
+-		spin_lock_irqsave(&rtc_lock, flags);
+-		sec = m41t81_read(M41T81REG_SC);
+-		min = m41t81_read(M41T81REG_MN);
+-		if (sec == m41t81_read(M41T81REG_SC)) break;
+-		spin_unlock_irqrestore(&rtc_lock, flags);
+-	}
+-	hour = m41t81_read(M41T81REG_HR) & 0x3f;
+-	day = m41t81_read(M41T81REG_DT);
+-	mon = m41t81_read(M41T81REG_MO);
+-	year = m41t81_read(M41T81REG_YR);
+-	spin_unlock_irqrestore(&rtc_lock, flags);
+-
+-	sec = bcd2bin(sec);
+-	min = bcd2bin(min);
+-	hour = bcd2bin(hour);
+-	day = bcd2bin(day);
+-	mon = bcd2bin(mon);
+-	year = bcd2bin(year);
+-
+-	year += 2000;
+-
+-	return mktime(year, mon, day, hour, min, sec);
+-}
+-
+-int m41t81_probe(void)
+-{
+-	unsigned int tmp;
+-
+-	/* enable chip if it is not enabled yet */
+-	tmp = m41t81_read(M41T81REG_SC);
+-	m41t81_write(M41T81REG_SC, tmp & 0x7f);
+-
+-	return (m41t81_read(M41T81REG_SC) != -1);
+-}
+--- a/arch/mips/sibyte/swarm/rtc_xicor1241.c
++++ /dev/null
+@@ -1,210 +0,0 @@
+-/*
+- * 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/bcd.h>
+-#include <linux/types.h>
+-#include <linux/time.h>
+-
+-#include <asm/time.h>
+-#include <asm/addrspace.h>
+-#include <asm/io.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)	IOADDR(A_SMB_REGISTER(1, reg))
+-
+-static int xicor_read(uint8_t addr)
+-{
+-        while (__raw_readq(SMB_CSR(R_SMB_STATUS)) & M_SMB_BUSY)
+-                ;
+-
+-	__raw_writeq((addr >> 8) & 0x7, SMB_CSR(R_SMB_CMD));
+-	__raw_writeq(addr & 0xff, SMB_CSR(R_SMB_DATA));
+-	__raw_writeq(V_SMB_ADDR(X1241_CCR_ADDRESS) | V_SMB_TT_WR2BYTE,
+-		     SMB_CSR(R_SMB_START));
+-
+-        while (__raw_readq(SMB_CSR(R_SMB_STATUS)) & M_SMB_BUSY)
+-                ;
+-
+-	__raw_writeq(V_SMB_ADDR(X1241_CCR_ADDRESS) | V_SMB_TT_RD1BYTE,
+-		     SMB_CSR(R_SMB_START));
+-
+-        while (__raw_readq(SMB_CSR(R_SMB_STATUS)) & M_SMB_BUSY)
+-                ;
+-
+-        if (__raw_readq(SMB_CSR(R_SMB_STATUS)) & M_SMB_ERROR) {
+-                /* Clear error bit by writing a 1 */
+-                __raw_writeq(M_SMB_ERROR, SMB_CSR(R_SMB_STATUS));
+-                return -1;
+-        }
+-
+-	return (__raw_readq(SMB_CSR(R_SMB_DATA)) & 0xff);
+-}
+-
+-static int xicor_write(uint8_t addr, int b)
+-{
+-        while (__raw_readq(SMB_CSR(R_SMB_STATUS)) & M_SMB_BUSY)
+-                ;
+-
+-	__raw_writeq(addr, SMB_CSR(R_SMB_CMD));
+-	__raw_writeq((addr & 0xff) | ((b & 0xff) << 8), SMB_CSR(R_SMB_DATA));
+-	__raw_writeq(V_SMB_ADDR(X1241_CCR_ADDRESS) | V_SMB_TT_WR3BYTE,
+-		     SMB_CSR(R_SMB_START));
+-
+-        while (__raw_readq(SMB_CSR(R_SMB_STATUS)) & M_SMB_BUSY)
+-                ;
+-
+-        if (__raw_readq(SMB_CSR(R_SMB_STATUS)) & M_SMB_ERROR) {
+-                /* Clear error bit by writing a 1 */
+-                __raw_writeq(M_SMB_ERROR, SMB_CSR(R_SMB_STATUS));
+-                return -1;
+-        } else {
+-		return 0;
+-	}
+-}
+-
+-int xicor_set_time(unsigned long t)
+-{
+-	struct rtc_time tm;
+-	int tmp;
+-	unsigned long flags;
+-
+-	rtc_time_to_tm(t, &tm);
+-	tm.tm_year += 1900;
+-
+-	spin_lock_irqsave(&rtc_lock, flags);
+-	/* unlock writes to the CCR */
+-	xicor_write(X1241REG_SR, X1241REG_SR_WEL);
+-	xicor_write(X1241REG_SR, X1241REG_SR_WEL | X1241REG_SR_RWEL);
+-
+-	/* trivial ones */
+-	tm.tm_sec = bin2bcd(tm.tm_sec);
+-	xicor_write(X1241REG_SC, tm.tm_sec);
+-
+-	tm.tm_min = bin2bcd(tm.tm_min);
+-	xicor_write(X1241REG_MN, tm.tm_min);
+-
+-	tm.tm_mday = bin2bcd(tm.tm_mday);
+-	xicor_write(X1241REG_DT, tm.tm_mday);
+-
+-	/* tm_mon starts from 0, *ick* */
+-	tm.tm_mon ++;
+-	tm.tm_mon = bin2bcd(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 */
+-		tm.tm_hour = bin2bcd(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;
+-		}
+-		tm.tm_hour = bin2bcd(tm.tm_hour);
+-		tmp |= tm.tm_hour;
+-	}
+-	xicor_write(X1241REG_HR, tmp);
+-
+-	xicor_write(X1241REG_SR, 0);
+-	spin_unlock_irqrestore(&rtc_lock, flags);
+-
+-	return 0;
+-}
+-
+-unsigned long xicor_get_time(void)
+-{
+-	unsigned int year, mon, day, hour, min, sec, y2k;
+-	unsigned long flags;
+-
+-	spin_lock_irqsave(&rtc_lock, flags);
+-	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;
+-	}
+-
+-	day = xicor_read(X1241REG_DT);
+-	mon = xicor_read(X1241REG_MO);
+-	year = xicor_read(X1241REG_YR);
+-	y2k = xicor_read(X1241REG_Y2K);
+-	spin_unlock_irqrestore(&rtc_lock, flags);
+-
+-	sec = bcd2bin(sec);
+-	min = bcd2bin(min);
+-	hour = bcd2bin(hour);
+-	day = bcd2bin(day);
+-	mon = bcd2bin(mon);
+-	year = bcd2bin(year);
+-	y2k = bcd2bin(y2k);
+-
+-	year += (y2k * 100);
+-
+-	return mktime(year, mon, day, hour, min, sec);
+-}
+-
+-int xicor_probe(void)
+-{
+-	return (xicor_read(X1241REG_SC) != -1);
+-}
+--- a/arch/mips/sibyte/swarm/setup.c
++++ b/arch/mips/sibyte/swarm/setup.c
+@@ -56,14 +56,6 @@ extern void sb1250_setup(void);
+ #error invalid SiByte board configuration
+ #endif
+ 
+-extern int xicor_probe(void);
+-extern int xicor_set_time(unsigned long);
+-extern unsigned long xicor_get_time(void);
+-
+-extern int m41t81_probe(void);
+-extern int m41t81_set_time(unsigned long);
+-extern unsigned long m41t81_get_time(void);
+-
+ const char *get_system_type(void)
+ {
+ 	return "SiByte " SIBYTE_BOARD_NAME;
+@@ -79,42 +71,14 @@ int swarm_be_handler(struct pt_regs *reg
+ 	return (is_fixup ? MIPS_BE_FIXUP : MIPS_BE_FATAL);
+ }
+ 
+-enum swarm_rtc_type {
+-	RTC_NONE,
+-	RTC_XICOR,
+-	RTC_M4LT81
+-};
+-
+-enum swarm_rtc_type swarm_rtc_type;
+-
+ unsigned long read_persistent_clock(void)
+ {
+-	switch (swarm_rtc_type) {
+-	case RTC_XICOR:
+-		return xicor_get_time();
+-
+-	case RTC_M4LT81:
+-		return m41t81_get_time();
+-
+-	case RTC_NONE:
+-	default:
+-		return mktime(2000, 1, 1, 0, 0, 0);
+-	}
++	return mktime(2000, 1, 1, 0, 0, 0);
+ }
+ 
+ int rtc_mips_set_time(unsigned long sec)
+ {
+-	switch (swarm_rtc_type) {
+-	case RTC_XICOR:
+-		return xicor_set_time(sec);
+-
+-	case RTC_M4LT81:
+-		return m41t81_set_time(sec);
+-
+-	case RTC_NONE:
+-	default:
+-		return -1;
+-	}
++	return -1;
+ }
+ 
+ void __init plat_mem_setup(void)
+@@ -131,11 +95,6 @@ void __init plat_mem_setup(void)
+ 
+ 	board_be_handler = swarm_be_handler;
+ 
+-	if (xicor_probe())
+-		swarm_rtc_type = RTC_XICOR;
+-	if (m41t81_probe())
+-		swarm_rtc_type = RTC_M4LT81;
+-
+ 	printk("This kernel optimized for "
+ #ifdef CONFIG_SIMULATION
+ 	       "simulation"