drivers/i2c : move i2c drivers to drivers/i2c

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>

5 files changed, 1237 insertions, 0 deletions

diff --git a/drivers/i2c/Makefile b/drivers/i2c/Makefile
new file mode 100644
index 00000000000..29d6c03dbb3
--- /dev/null
+++ b/drivers/i2c/Makefile
@@ -0,0 +1,49 @@
+#
+# (C) Copyright 2000-2007
+# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+#
+# See file CREDITS for list of people who contributed to this
+# project.
+#
+# 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.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+# MA 02111-1307 USA
+#
+
+include $(TOPDIR)/config.mk
+
+LIB 	:= $(obj)libi2c.a
+
+COBJS-y += fsl_i2c.o
+COBJS-y += omap1510_i2c.o
+COBJS-y += omap24xx_i2c.o
+COBJS-y += tsi108_i2c.o
+
+COBJS	:= $(COBJS-y)
+SRCS 	:= $(COBJS:.o=.c)
+OBJS 	:= $(addprefix $(obj),$(COBJS))
+
+all:	$(LIB)
+
+$(LIB):	$(obj).depend $(OBJS)
+	$(AR) $(ARFLAGS) $@ $(OBJS)
+
+#########################################################################
+
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
+
+sinclude $(obj).depend
+
+#########################################################################
diff --git a/drivers/i2c/fsl_i2c.c b/drivers/i2c/fsl_i2c.c
new file mode 100644
index 00000000000..22485ea916f
--- /dev/null
+++ b/drivers/i2c/fsl_i2c.c
@@ -0,0 +1,295 @@
+/*
+ * Copyright 2006 Freescale Semiconductor, Inc.
+ *
+ * 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 published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+
+#ifdef CONFIG_FSL_I2C
+#ifdef CONFIG_HARD_I2C
+
+#include <command.h>
+#include <i2c.h>		/* Functional interface */
+
+#include <asm/io.h>
+#include <asm/fsl_i2c.h>	/* HW definitions */
+
+#define I2C_TIMEOUT	(CFG_HZ / 4)
+
+#define I2C_READ_BIT  1
+#define I2C_WRITE_BIT 0
+
+/* Initialize the bus pointer to whatever one the SPD EEPROM is on.
+ * Default is bus 0.  This is necessary because the DDR initialization
+ * runs from ROM, and we can't switch buses because we can't modify
+ * the global variables.
+ */
+#ifdef CFG_SPD_BUS_NUM
+static unsigned int i2c_bus_num __attribute__ ((section ("data"))) = CFG_SPD_BUS_NUM;
+#else
+static unsigned int i2c_bus_num __attribute__ ((section ("data"))) = 0;
+#endif
+
+static volatile struct fsl_i2c *i2c_dev[2] = {
+	(struct fsl_i2c *) (CFG_IMMR + CFG_I2C_OFFSET),
+#ifdef CFG_I2C2_OFFSET
+	(struct fsl_i2c *) (CFG_IMMR + CFG_I2C2_OFFSET)
+#endif
+};
+
+void
+i2c_init(int speed, int slaveadd)
+{
+	volatile struct fsl_i2c *dev;
+
+	dev = (struct fsl_i2c *) (CFG_IMMR + CFG_I2C_OFFSET);
+
+	writeb(0, &dev->cr);			/* stop I2C controller */
+	udelay(5);				/* let it shutdown in peace */
+	writeb(0x3F, &dev->fdr);		/* set bus speed */
+	writeb(0x3F, &dev->dfsrr);		/* set default filter */
+	writeb(slaveadd << 1, &dev->adr);	/* write slave address */
+	writeb(0x0, &dev->sr);			/* clear status register */
+	writeb(I2C_CR_MEN, &dev->cr);		/* start I2C controller */
+
+#ifdef	CFG_I2C2_OFFSET
+	dev = (struct fsl_i2c *) (CFG_IMMR + CFG_I2C2_OFFSET);
+
+	writeb(0, &dev->cr);			/* stop I2C controller */
+	udelay(5);				/* let it shutdown in peace */
+	writeb(0x3F, &dev->fdr);		/* set bus speed */
+	writeb(0x3F, &dev->dfsrr);		/* set default filter */
+	writeb(slaveadd << 1, &dev->adr);	/* write slave address */
+	writeb(0x0, &dev->sr);			/* clear status register */
+	writeb(I2C_CR_MEN, &dev->cr);		/* start I2C controller */
+#endif	/* CFG_I2C2_OFFSET */
+}
+
+static __inline__ int
+i2c_wait4bus(void)
+{
+	ulong timeval = get_timer(0);
+
+	while (readb(&i2c_dev[i2c_bus_num]->sr) & I2C_SR_MBB) {
+		if (get_timer(timeval) > I2C_TIMEOUT) {
+			return -1;
+		}
+	}
+
+	return 0;
+}
+
+static __inline__ int
+i2c_wait(int write)
+{
+	u32 csr;
+	ulong timeval = get_timer(0);
+
+	do {
+		csr = readb(&i2c_dev[i2c_bus_num]->sr);
+		if (!(csr & I2C_SR_MIF))
+			continue;
+
+		writeb(0x0, &i2c_dev[i2c_bus_num]->sr);
+
+		if (csr & I2C_SR_MAL) {
+			debug("i2c_wait: MAL\n");
+			return -1;
+		}
+
+		if (!(csr & I2C_SR_MCF))	{
+			debug("i2c_wait: unfinished\n");
+			return -1;
+		}
+
+		if (write == I2C_WRITE_BIT && (csr & I2C_SR_RXAK)) {
+			debug("i2c_wait: No RXACK\n");
+			return -1;
+		}
+
+		return 0;
+	} while (get_timer (timeval) < I2C_TIMEOUT);
+
+	debug("i2c_wait: timed out\n");
+	return -1;
+}
+
+static __inline__ int
+i2c_write_addr (u8 dev, u8 dir, int rsta)
+{
+	writeb(I2C_CR_MEN | I2C_CR_MSTA | I2C_CR_MTX
+	       | (rsta ? I2C_CR_RSTA : 0),
+	       &i2c_dev[i2c_bus_num]->cr);
+
+	writeb((dev << 1) | dir, &i2c_dev[i2c_bus_num]->dr);
+
+	if (i2c_wait(I2C_WRITE_BIT) < 0)
+		return 0;
+
+	return 1;
+}
+
+static __inline__ int
+__i2c_write(u8 *data, int length)
+{
+	int i;
+
+	writeb(I2C_CR_MEN | I2C_CR_MSTA | I2C_CR_MTX,
+	       &i2c_dev[i2c_bus_num]->cr);
+
+	for (i = 0; i < length; i++) {
+		writeb(data[i], &i2c_dev[i2c_bus_num]->dr);
+
+		if (i2c_wait(I2C_WRITE_BIT) < 0)
+			break;
+	}
+
+	return i;
+}
+
+static __inline__ int
+__i2c_read(u8 *data, int length)
+{
+	int i;
+
+	writeb(I2C_CR_MEN | I2C_CR_MSTA | ((length == 1) ? I2C_CR_TXAK : 0),
+	       &i2c_dev[i2c_bus_num]->cr);
+
+	/* dummy read */
+	readb(&i2c_dev[i2c_bus_num]->dr);
+
+	for (i = 0; i < length; i++) {
+		if (i2c_wait(I2C_READ_BIT) < 0)
+			break;
+
+		/* Generate ack on last next to last byte */
+		if (i == length - 2)
+			writeb(I2C_CR_MEN | I2C_CR_MSTA | I2C_CR_TXAK,
+			       &i2c_dev[i2c_bus_num]->cr);
+
+		/* Generate stop on last byte */
+		if (i == length - 1)
+			writeb(I2C_CR_MEN | I2C_CR_TXAK, &i2c_dev[i2c_bus_num]->cr);
+
+		data[i] = readb(&i2c_dev[i2c_bus_num]->dr);
+	}
+
+	return i;
+}
+
+int
+i2c_read(u8 dev, uint addr, int alen, u8 *data, int length)
+{
+	int i = -1; /* signal error */
+	u8 *a = (u8*)&addr;
+
+	if (i2c_wait4bus() >= 0
+	    && i2c_write_addr(dev, I2C_WRITE_BIT, 0) != 0
+	    && __i2c_write(&a[4 - alen], alen) == alen)
+		i = 0; /* No error so far */
+
+	if (length
+	    && i2c_write_addr(dev, I2C_READ_BIT, 1) != 0)
+		i = __i2c_read(data, length);
+
+	writeb(I2C_CR_MEN, &i2c_dev[i2c_bus_num]->cr);
+
+	if (i == length)
+	    return 0;
+
+	return -1;
+}
+
+int
+i2c_write(u8 dev, uint addr, int alen, u8 *data, int length)
+{
+	int i = -1; /* signal error */
+	u8 *a = (u8*)&addr;
+
+	if (i2c_wait4bus() >= 0
+	    && i2c_write_addr(dev, I2C_WRITE_BIT, 0) != 0
+	    && __i2c_write(&a[4 - alen], alen) == alen) {
+		i = __i2c_write(data, length);
+	}
+
+	writeb(I2C_CR_MEN, &i2c_dev[i2c_bus_num]->cr);
+
+	if (i == length)
+	    return 0;
+
+	return -1;
+}
+
+int
+i2c_probe(uchar chip)
+{
+	/* For unknow reason the controller will ACK when
+	 * probing for a slave with the same address, so skip
+	 * it.
+	 */
+	if (chip == (readb(&i2c_dev[i2c_bus_num]->adr) >> 1))
+		return -1;
+
+	return i2c_read(chip, 0, 0, NULL, 0);
+}
+
+uchar
+i2c_reg_read(uchar i2c_addr, uchar reg)
+{
+	uchar buf[1];
+
+	i2c_read(i2c_addr, reg, 1, buf, 1);
+
+	return buf[0];
+}
+
+void
+i2c_reg_write(uchar i2c_addr, uchar reg, uchar val)
+{
+	i2c_write(i2c_addr, reg, 1, &val, 1);
+}
+
+int i2c_set_bus_num(unsigned int bus)
+{
+#ifdef CFG_I2C2_OFFSET
+	if (bus > 1) {
+#else
+	if (bus > 0) {
+#endif
+		return -1;
+	}
+
+	i2c_bus_num = bus;
+
+	return 0;
+}
+
+int i2c_set_bus_speed(unsigned int speed)
+{
+	return -1;
+}
+
+unsigned int i2c_get_bus_num(void)
+{
+	return i2c_bus_num;
+}
+
+unsigned int i2c_get_bus_speed(void)
+{
+	return 0;
+}
+#endif /* CONFIG_HARD_I2C */
+#endif /* CONFIG_FSL_I2C */
diff --git a/drivers/i2c/omap1510_i2c.c b/drivers/i2c/omap1510_i2c.c
new file mode 100644
index 00000000000..04400fbcd23
--- /dev/null
+++ b/drivers/i2c/omap1510_i2c.c
@@ -0,0 +1,281 @@
+/*
+ * Basic I2C functions
+ *
+ * Copyright (c) 2003 Texas Instruments
+ *
+ * This package is free software;  you can redistribute it and/or
+ * modify it under the terms of the license found in the file
+ * named COPYING that should have accompanied this file.
+ *
+ * THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * Author: Jian Zhang jzhang@ti.com, Texas Instruments
+ *
+ * Copyright (c) 2003 Wolfgang Denk, wd@denx.de
+ * Rewritten to fit into the current U-Boot framework
+ *
+ */
+
+#include <common.h>
+
+#ifdef CONFIG_DRIVER_OMAP1510_I2C
+
+static void wait_for_bb (void);
+static u16 wait_for_pin (void);
+
+void i2c_init (int speed, int slaveadd)
+{
+	u16 scl;
+
+	if (inw (I2C_CON) & I2C_CON_EN) {
+		outw (0, I2C_CON);
+		udelay (5000);
+	}
+
+	/* 12Mhz I2C module clock */
+	outw (0, I2C_PSC);
+	outw (I2C_CON_EN, I2C_CON);
+	outw (0, I2C_SYSTEST);
+	/* have to enable intrrupts or OMAP i2c module doesn't work */
+	outw (I2C_IE_XRDY_IE | I2C_IE_RRDY_IE | I2C_IE_ARDY_IE |
+	      I2C_IE_NACK_IE | I2C_IE_AL_IE, I2C_IE);
+	scl = (12000000 / 2) / speed - 6;
+	outw (scl, I2C_SCLL);
+	outw (scl, I2C_SCLH);
+	/* own address */
+	outw (slaveadd, I2C_OA);
+	outw (0, I2C_CNT);
+	udelay (1000);
+}
+
+static int i2c_read_byte (u8 devaddr, u8 regoffset, u8 * value)
+{
+	int i2c_error = 0;
+	u16 status;
+
+	/* wait until bus not busy */
+	wait_for_bb ();
+
+	/* one byte only */
+	outw (1, I2C_CNT);
+	/* set slave address */
+	outw (devaddr, I2C_SA);
+	/* no stop bit needed here */
+	outw (I2C_CON_EN | I2C_CON_MST | I2C_CON_STT | I2C_CON_TRX, I2C_CON);
+
+	status = wait_for_pin ();
+
+	if (status & I2C_STAT_XRDY) {
+		/* Important: have to use byte access */
+		*(volatile u8 *) (I2C_DATA) = regoffset;
+		udelay (20000);
+		if (inw (I2C_STAT) & I2C_STAT_NACK) {
+			i2c_error = 1;
+		}
+	} else {
+		i2c_error = 1;
+	}
+
+	if (!i2c_error) {
+		/* free bus, otherwise we can't use a combined transction */
+		outw (0, I2C_CON);
+		while (inw (I2C_STAT) || (inw (I2C_CON) & I2C_CON_MST)) {
+			udelay (10000);
+			/* Have to clear pending interrupt to clear I2C_STAT */
+			inw (I2C_IV);
+		}
+
+		wait_for_bb ();
+		/* set slave address */
+		outw (devaddr, I2C_SA);
+		/* read one byte from slave */
+		outw (1, I2C_CNT);
+		/* need stop bit here */
+		outw (I2C_CON_EN | I2C_CON_MST | I2C_CON_STT | I2C_CON_STP,
+		      I2C_CON);
+
+		status = wait_for_pin ();
+		if (status & I2C_STAT_RRDY) {
+			*value = inw (I2C_DATA);
+			udelay (20000);
+		} else {
+			i2c_error = 1;
+		}
+
+		if (!i2c_error) {
+			outw (I2C_CON_EN, I2C_CON);
+			while (inw (I2C_STAT)
+			       || (inw (I2C_CON) & I2C_CON_MST)) {
+				udelay (10000);
+				inw (I2C_IV);
+			}
+		}
+	}
+
+	return i2c_error;
+}
+
+static int i2c_write_byte (u8 devaddr, u8 regoffset, u8 value)
+{
+	int i2c_error = 0;
+	u16 status;
+
+	/* wait until bus not busy */
+	wait_for_bb ();
+
+	/* two bytes */
+	outw (2, I2C_CNT);
+	/* set slave address */
+	outw (devaddr, I2C_SA);
+	/* stop bit needed here */
+	outw (I2C_CON_EN | I2C_CON_MST | I2C_CON_STT | I2C_CON_TRX |
+	      I2C_CON_STP, I2C_CON);
+
+	/* wait until state change */
+	status = wait_for_pin ();
+
+	if (status & I2C_STAT_XRDY) {
+		/* send out two bytes */
+		outw ((value << 8) + regoffset, I2C_DATA);
+		/* must have enough delay to allow BB bit to go low */
+		udelay (30000);
+		if (inw (I2C_STAT) & I2C_STAT_NACK) {
+			i2c_error = 1;
+		}
+	} else {
+		i2c_error = 1;
+	}
+
+	if (!i2c_error) {
+		outw (I2C_CON_EN, I2C_CON);
+		while (inw (I2C_STAT) || (inw (I2C_CON) & I2C_CON_MST)) {
+			udelay (1000);
+			/* have to read to clear intrrupt */
+			inw (I2C_IV);
+		}
+	}
+
+	return i2c_error;
+}
+
+int i2c_probe (uchar chip)
+{
+	int res = 1;
+
+	if (chip == inw (I2C_OA)) {
+		return res;
+	}
+
+	/* wait until bus not busy */
+	wait_for_bb ();
+
+	/* try to read one byte */
+	outw (1, I2C_CNT);
+	/* set slave address */
+	outw (chip, I2C_SA);
+	/* stop bit needed here */
+	outw (I2C_CON_EN | I2C_CON_MST | I2C_CON_STT | I2C_CON_STP, I2C_CON);
+	/* enough delay for the NACK bit set */
+	udelay (2000);
+	if (!(inw (I2C_STAT) & I2C_STAT_NACK)) {
+		res = 0;
+	} else {
+		outw (inw (I2C_CON) | I2C_CON_STP, I2C_CON);
+		udelay (20);
+		wait_for_bb ();
+	}
+
+	return res;
+}
+
+int i2c_read (uchar chip, uint addr, int alen, uchar * buffer, int len)
+{
+	int i;
+
+	if (alen > 1) {
+		printf ("I2C read: addr len %d not supported\n", alen);
+		return 1;
+	}
+
+	if (addr + len > 256) {
+		printf ("I2C read: address out of range\n");
+		return 1;
+	}
+
+	for (i = 0; i < len; i++) {
+		if (i2c_read_byte (chip, addr + i, &buffer[i])) {
+			printf ("I2C read: I/O error\n");
+			i2c_init (CFG_I2C_SPEED, CFG_I2C_SLAVE);
+			return 1;
+		}
+	}
+
+	return 0;
+}
+
+int i2c_write (uchar chip, uint addr, int alen, uchar * buffer, int len)
+{
+	int i;
+
+	if (alen > 1) {
+		printf ("I2C read: addr len %d not supported\n", alen);
+		return 1;
+	}
+
+	if (addr + len > 256) {
+		printf ("I2C read: address out of range\n");
+		return 1;
+	}
+
+	for (i = 0; i < len; i++) {
+		if (i2c_write_byte (chip, addr + i, buffer[i])) {
+			printf ("I2C read: I/O error\n");
+			i2c_init (CFG_I2C_SPEED, CFG_I2C_SLAVE);
+			return 1;
+		}
+	}
+
+	return 0;
+}
+
+static void wait_for_bb (void)
+{
+	int timeout = 10;
+
+	while ((inw (I2C_STAT) & I2C_STAT_BB) && timeout--) {
+		inw (I2C_IV);
+		udelay (1000);
+	}
+
+	if (timeout <= 0) {
+		printf ("timed out in wait_for_bb: I2C_STAT=%x\n",
+			inw (I2C_STAT));
+	}
+}
+
+static u16 wait_for_pin (void)
+{
+	u16 status, iv;
+	int timeout = 10;
+
+	do {
+		udelay (1000);
+		status = inw (I2C_STAT);
+		iv = inw (I2C_IV);
+	} while (!iv &&
+		 !(status &
+		   (I2C_STAT_ROVR | I2C_STAT_XUDF | I2C_STAT_XRDY |
+		    I2C_STAT_RRDY | I2C_STAT_ARDY | I2C_STAT_NACK |
+		    I2C_STAT_AL)) && timeout--);
+
+	if (timeout <= 0) {
+		printf ("timed out in wait_for_pin: I2C_STAT=%x\n",
+			inw (I2C_STAT));
+	}
+
+	return status;
+}
+
+#endif /* CONFIG_DRIVER_OMAP1510_I2C */
diff --git a/drivers/i2c/omap24xx_i2c.c b/drivers/i2c/omap24xx_i2c.c
new file mode 100644
index 00000000000..7dab78685df
--- /dev/null
+++ b/drivers/i2c/omap24xx_i2c.c
@@ -0,0 +1,329 @@
+/*
+ * Basic I2C functions
+ *
+ * Copyright (c) 2004 Texas Instruments
+ *
+ * This package is free software;  you can redistribute it and/or
+ * modify it under the terms of the license found in the file
+ * named COPYING that should have accompanied this file.
+ *
+ * THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * Author: Jian Zhang jzhang@ti.com, Texas Instruments
+ *
+ * Copyright (c) 2003 Wolfgang Denk, wd@denx.de
+ * Rewritten to fit into the current U-Boot framework
+ *
+ * Adapted for OMAP2420 I2C, r-woodruff2@ti.com
+ *
+ */
+
+#include <common.h>
+
+#ifdef CONFIG_DRIVER_OMAP24XX_I2C
+
+#include <asm/arch/i2c.h>
+#include <asm/io.h>
+
+#define inw(a) __raw_readw(a)
+#define outw(a,v) __raw_writew(a,v)
+
+static void wait_for_bb (void);
+static u16 wait_for_pin (void);
+static void flush_fifo(void);
+
+void i2c_init (int speed, int slaveadd)
+{
+	u16 scl;
+
+	outw(0x2, I2C_SYSC); /* for ES2 after soft reset */
+	udelay(1000);
+	outw(0x0, I2C_SYSC); /* will probably self clear but */
+
+	if (inw (I2C_CON) & I2C_CON_EN) {
+		outw (0, I2C_CON);
+		udelay (50000);
+	}
+
+	/* 12Mhz I2C module clock */
+	outw (0, I2C_PSC);
+	speed = speed/1000;		    /* 100 or 400 */
+	scl = ((12000/(speed*2)) - 7);	/* use 7 when PSC = 0 */
+	outw (scl, I2C_SCLL);
+	outw (scl, I2C_SCLH);
+	/* own address */
+	outw (slaveadd, I2C_OA);
+	outw (I2C_CON_EN, I2C_CON);
+
+	/* have to enable intrrupts or OMAP i2c module doesn't work */
+	outw (I2C_IE_XRDY_IE | I2C_IE_RRDY_IE | I2C_IE_ARDY_IE |
+	      I2C_IE_NACK_IE | I2C_IE_AL_IE, I2C_IE);
+	udelay (1000);
+	flush_fifo();
+	outw (0xFFFF, I2C_STAT);
+	outw (0, I2C_CNT);
+}
+
+static int i2c_read_byte (u8 devaddr, u8 regoffset, u8 * value)
+{
+	int i2c_error = 0;
+	u16 status;
+
+	/* wait until bus not busy */
+	wait_for_bb ();
+
+	/* one byte only */
+	outw (1, I2C_CNT);
+	/* set slave address */
+	outw (devaddr, I2C_SA);
+	/* no stop bit needed here */
+	outw (I2C_CON_EN | I2C_CON_MST | I2C_CON_STT | I2C_CON_TRX, I2C_CON);
+
+	status = wait_for_pin ();
+
+	if (status & I2C_STAT_XRDY) {
+		/* Important: have to use byte access */
+		*(volatile u8 *) (I2C_DATA) = regoffset;
+		udelay (20000);
+		if (inw (I2C_STAT) & I2C_STAT_NACK) {
+			i2c_error = 1;
+		}
+	} else {
+		i2c_error = 1;
+	}
+
+	if (!i2c_error) {
+		/* free bus, otherwise we can't use a combined transction */
+		outw (0, I2C_CON);
+		while (inw (I2C_STAT) || (inw (I2C_CON) & I2C_CON_MST)) {
+			udelay (10000);
+			/* Have to clear pending interrupt to clear I2C_STAT */
+			outw (0xFFFF, I2C_STAT);
+		}
+
+		wait_for_bb ();
+		/* set slave address */
+		outw (devaddr, I2C_SA);
+		/* read one byte from slave */
+		outw (1, I2C_CNT);
+		/* need stop bit here */
+		outw (I2C_CON_EN | I2C_CON_MST | I2C_CON_STT | I2C_CON_STP,
+		      I2C_CON);
+
+		status = wait_for_pin ();
+		if (status & I2C_STAT_RRDY) {
+			*value = inw (I2C_DATA);
+			udelay (20000);
+		} else {
+			i2c_error = 1;
+		}
+
+		if (!i2c_error) {
+			outw (I2C_CON_EN, I2C_CON);
+			while (inw (I2C_STAT)
+			       || (inw (I2C_CON) & I2C_CON_MST)) {
+				udelay (10000);
+				outw (0xFFFF, I2C_STAT);
+			}
+		}
+	}
+	flush_fifo();
+	outw (0xFFFF, I2C_STAT);
+	outw (0, I2C_CNT);
+	return i2c_error;
+}
+
+static int i2c_write_byte (u8 devaddr, u8 regoffset, u8 value)
+{
+	int i2c_error = 0;
+	u16 status, stat;
+
+	/* wait until bus not busy */
+	wait_for_bb ();
+
+	/* two bytes */
+	outw (2, I2C_CNT);
+	/* set slave address */
+	outw (devaddr, I2C_SA);
+	/* stop bit needed here */
+	outw (I2C_CON_EN | I2C_CON_MST | I2C_CON_STT | I2C_CON_TRX |
+	      I2C_CON_STP, I2C_CON);
+
+	/* wait until state change */
+	status = wait_for_pin ();
+
+	if (status & I2C_STAT_XRDY) {
+		/* send out two bytes */
+		outw ((value << 8) + regoffset, I2C_DATA);
+		/* must have enough delay to allow BB bit to go low */
+		udelay (50000);
+		if (inw (I2C_STAT) & I2C_STAT_NACK) {
+			i2c_error = 1;
+		}
+	} else {
+		i2c_error = 1;
+	}
+
+	if (!i2c_error) {
+		int eout = 200;
+
+		outw (I2C_CON_EN, I2C_CON);
+		while ((stat = inw (I2C_STAT)) || (inw (I2C_CON) & I2C_CON_MST)) {
+			udelay (1000);
+			/* have to read to clear intrrupt */
+			outw (0xFFFF, I2C_STAT);
+			if(--eout == 0) /* better leave with error than hang */
+				break;
+		}
+	}
+	flush_fifo();
+	outw (0xFFFF, I2C_STAT);
+	outw (0, I2C_CNT);
+	return i2c_error;
+}
+
+static void flush_fifo(void)
+{	u16 stat;
+
+	/* note: if you try and read data when its not there or ready
+	 * you get a bus error
+	 */
+	while(1){
+		stat = inw(I2C_STAT);
+		if(stat == I2C_STAT_RRDY){
+			inw(I2C_DATA);
+			outw(I2C_STAT_RRDY,I2C_STAT);
+			udelay(1000);
+		}else
+			break;
+	}
+}
+
+int i2c_probe (uchar chip)
+{
+	int res = 1; /* default = fail */
+
+	if (chip == inw (I2C_OA)) {
+		return res;
+	}
+
+	/* wait until bus not busy */
+	wait_for_bb ();
+
+	/* try to read one byte */
+	outw (1, I2C_CNT);
+	/* set slave address */
+	outw (chip, I2C_SA);
+	/* stop bit needed here */
+	outw (I2C_CON_EN | I2C_CON_MST | I2C_CON_STT | I2C_CON_STP, I2C_CON);
+	/* enough delay for the NACK bit set */
+	udelay (50000);
+
+	if (!(inw (I2C_STAT) & I2C_STAT_NACK)) {
+		res = 0;      /* success case */
+		flush_fifo();
+		outw(0xFFFF, I2C_STAT);
+	} else {
+		outw(0xFFFF, I2C_STAT);	 /* failue, clear sources*/
+		outw (inw (I2C_CON) | I2C_CON_STP, I2C_CON); /* finish up xfer */
+		udelay(20000);
+		wait_for_bb ();
+	}
+	flush_fifo();
+	outw (0, I2C_CNT); /* don't allow any more data in...we don't want it.*/
+	outw(0xFFFF, I2C_STAT);
+	return res;
+}
+
+int i2c_read (uchar chip, uint addr, int alen, uchar * buffer, int len)
+{
+	int i;
+
+	if (alen > 1) {
+		printf ("I2C read: addr len %d not supported\n", alen);
+		return 1;
+	}
+
+	if (addr + len > 256) {
+		printf ("I2C read: address out of range\n");
+		return 1;
+	}
+
+	for (i = 0; i < len; i++) {
+		if (i2c_read_byte (chip, addr + i, &buffer[i])) {
+			printf ("I2C read: I/O error\n");
+			i2c_init (CFG_I2C_SPEED, CFG_I2C_SLAVE);
+			return 1;
+		}
+	}
+
+	return 0;
+}
+
+int i2c_write (uchar chip, uint addr, int alen, uchar * buffer, int len)
+{
+	int i;
+
+	if (alen > 1) {
+		printf ("I2C read: addr len %d not supported\n", alen);
+		return 1;
+	}
+
+	if (addr + len > 256) {
+		printf ("I2C read: address out of range\n");
+		return 1;
+	}
+
+	for (i = 0; i < len; i++) {
+		if (i2c_write_byte (chip, addr + i, buffer[i])) {
+			printf ("I2C read: I/O error\n");
+			i2c_init (CFG_I2C_SPEED, CFG_I2C_SLAVE);
+			return 1;
+		}
+	}
+
+	return 0;
+}
+
+static void wait_for_bb (void)
+{
+	int timeout = 10;
+	u16 stat;
+
+	outw(0xFFFF, I2C_STAT);	 /* clear current interruts...*/
+	while ((stat = inw (I2C_STAT) & I2C_STAT_BB) && timeout--) {
+		outw (stat, I2C_STAT);
+		udelay (50000);
+	}
+
+	if (timeout <= 0) {
+		printf ("timed out in wait_for_bb: I2C_STAT=%x\n",
+			inw (I2C_STAT));
+	}
+	outw(0xFFFF, I2C_STAT);	 /* clear delayed stuff*/
+}
+
+static u16 wait_for_pin (void)
+{
+	u16 status;
+	int timeout = 10;
+
+	do {
+		udelay (1000);
+		status = inw (I2C_STAT);
+	} while (  !(status &
+		   (I2C_STAT_ROVR | I2C_STAT_XUDF | I2C_STAT_XRDY |
+		    I2C_STAT_RRDY | I2C_STAT_ARDY | I2C_STAT_NACK |
+		    I2C_STAT_AL)) && timeout--);
+
+	if (timeout <= 0) {
+		printf ("timed out in wait_for_pin: I2C_STAT=%x\n",
+			inw (I2C_STAT));
+			outw(0xFFFF, I2C_STAT);
+}
+	return status;
+}
+
+#endif /* CONFIG_DRIVER_OMAP24XX_I2C */
diff --git a/drivers/i2c/tsi108_i2c.c b/drivers/i2c/tsi108_i2c.c
new file mode 100644
index 00000000000..d6736b0477e
--- /dev/null
+++ b/drivers/i2c/tsi108_i2c.c
@@ -0,0 +1,283 @@
+/*
+ * (C) Copyright 2004 Tundra Semiconductor Corp.
+ * Author: Alex Bounine
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ *
+ */
+
+#include <config.h>
+#include <common.h>
+
+#ifdef CONFIG_TSI108_I2C
+#include <tsi108.h>
+
+#if defined(CONFIG_CMD_I2C)
+
+#define I2C_DELAY	100000
+#undef  DEBUG_I2C
+
+#ifdef DEBUG_I2C
+#define DPRINT(x) printf (x)
+#else
+#define DPRINT(x)
+#endif
+
+/* All functions assume that Tsi108 I2C block is the only master on the bus */
+/* I2C read helper function */
+
+static int i2c_read_byte (
+		uint i2c_chan,	/* I2C channel number: 0 - main, 1 - SDC SPD */
+		uchar chip_addr,/* I2C device address on the bus */
+		uint byte_addr,	/* Byte address within I2C device */
+		uchar * buffer	/* pointer to data buffer */
+		)
+{
+	u32 temp;
+	u32 to_count = I2C_DELAY;
+	u32 op_status = TSI108_I2C_TIMEOUT_ERR;
+	u32 chan_offset = TSI108_I2C_OFFSET;
+
+	DPRINT (("I2C read_byte() %d 0x%02x 0x%02x\n",
+		i2c_chan, chip_addr, byte_addr));
+
+	if (0 != i2c_chan)
+		chan_offset = TSI108_I2C_SDRAM_OFFSET;
+
+	/* Check if I2C operation is in progress */
+	temp = *(u32 *) (CFG_TSI108_CSR_BASE + chan_offset + I2C_CNTRL2);
+
+	if (0 == (temp & (I2C_CNTRL2_RD_STATUS | I2C_CNTRL2_WR_STATUS |
+			  I2C_CNTRL2_START))) {
+		/* Set device address and operation (read = 0) */
+		temp = (byte_addr << 16) | ((chip_addr & 0x07) << 8) |
+		    ((chip_addr >> 3) & 0x0F);
+		*(u32 *) (CFG_TSI108_CSR_BASE + chan_offset + I2C_CNTRL1) =
+		    temp;
+
+		/* Issue the read command
+		 * (at this moment all other parameters are 0
+		 * (size = 1 byte, lane = 0)
+		 */
+
+		*(u32 *) (CFG_TSI108_CSR_BASE + chan_offset + I2C_CNTRL2) =
+		    (I2C_CNTRL2_START);
+
+		/* Wait until operation completed */
+		do {
+			/* Read I2C operation status */
+			temp = *(u32 *) (CFG_TSI108_CSR_BASE + chan_offset + I2C_CNTRL2);
+
+			if (0 == (temp & (I2C_CNTRL2_RD_STATUS | I2C_CNTRL2_START))) {
+				if (0 == (temp &
+				     (I2C_CNTRL2_I2C_CFGERR |
+				      I2C_CNTRL2_I2C_TO_ERR))
+				    ) {
+					op_status = TSI108_I2C_SUCCESS;
+
+					temp = *(u32 *) (CFG_TSI108_CSR_BASE +
+							 chan_offset +
+							 I2C_RD_DATA);
+
+					*buffer = (u8) (temp & 0xFF);
+				} else {
+					/* report HW error */
+					op_status = TSI108_I2C_IF_ERROR;
+
+					DPRINT (("I2C HW error reported: 0x%02x\n", temp));
+				}
+
+				break;
+			}
+		} while (to_count--);
+	} else {
+		op_status = TSI108_I2C_IF_BUSY;
+
+		DPRINT (("I2C Transaction start failed: 0x%02x\n", temp));
+	}
+
+	DPRINT (("I2C read_byte() status: 0x%02x\n", op_status));
+	return op_status;
+}
+
+/*
+ * I2C Read interface as defined in "include/i2c.h" :
+ *   chip_addr: I2C chip address, range 0..127
+ *                  (to read from SPD channel EEPROM use (0xD0 ... 0xD7)
+ *              NOTE: The bit 7 in the chip_addr serves as a channel select.
+ *              This hack is for enabling "isdram" command on Tsi108 boards
+ *              without changes to common code. Used for I2C reads only.
+ *   byte_addr: Memory or register address within the chip
+ *   alen:      Number of bytes to use for addr (typically 1, 2 for larger
+ *              memories, 0 for register type devices with only one
+ *              register)
+ *   buffer:    Pointer to destination buffer for data to be read
+ *   len:       How many bytes to read
+ *
+ *   Returns: 0 on success, not 0 on failure
+ */
+
+int i2c_read (uchar chip_addr, uint byte_addr, int alen,
+		uchar * buffer, int len)
+{
+	u32 op_status = TSI108_I2C_PARAM_ERR;
+	u32 i2c_if = 0;
+
+	/* Hack to support second (SPD) I2C controller (SPD EEPROM read only).*/
+	if (0xD0 == (chip_addr & ~0x07)) {
+		i2c_if = 1;
+		chip_addr &= 0x7F;
+	}
+	/* Check for valid I2C address */
+	if (chip_addr <= 0x7F && (byte_addr + len) <= (0x01 << (alen * 8))) {
+		while (len--) {
+			op_status = i2c_read_byte(i2c_if, chip_addr, byte_addr++, buffer++);
+
+			if (TSI108_I2C_SUCCESS != op_status) {
+				DPRINT (("I2C read_byte() failed: 0x%02x (%d left)\n", op_status, len));
+
+				break;
+			}
+		}
+	}
+
+	DPRINT (("I2C read() status: 0x%02x\n", op_status));
+	return op_status;
+}
+
+/* I2C write helper function */
+
+static int i2c_write_byte (uchar chip_addr,/* I2C device address on the bus */
+			  uint byte_addr, /* Byte address within I2C device */
+			  uchar * buffer  /*  pointer to data buffer */
+			  )
+{
+	u32 temp;
+	u32 to_count = I2C_DELAY;
+	u32 op_status = TSI108_I2C_TIMEOUT_ERR;
+
+	/* Check if I2C operation is in progress */
+	temp = *(u32 *) (CFG_TSI108_CSR_BASE + TSI108_I2C_OFFSET + I2C_CNTRL2);
+
+	if (0 == (temp & (I2C_CNTRL2_RD_STATUS | I2C_CNTRL2_WR_STATUS | I2C_CNTRL2_START))) {
+		/* Place data into the I2C Tx Register */
+		*(u32 *) (CFG_TSI108_CSR_BASE + TSI108_I2C_OFFSET +
+			  I2C_TX_DATA) = (u32) * buffer;
+
+		/* Set device address and operation  */
+		temp =
+		    I2C_CNTRL1_I2CWRITE | (byte_addr << 16) |
+		    ((chip_addr & 0x07) << 8) | ((chip_addr >> 3) & 0x0F);
+		*(u32 *) (CFG_TSI108_CSR_BASE + TSI108_I2C_OFFSET +
+			  I2C_CNTRL1) = temp;
+
+		/* Issue the write command (at this moment all other parameters
+		 * are 0 (size = 1 byte, lane = 0)
+		 */
+
+		*(u32 *) (CFG_TSI108_CSR_BASE + TSI108_I2C_OFFSET +
+			  I2C_CNTRL2) = (I2C_CNTRL2_START);
+
+		op_status = TSI108_I2C_TIMEOUT_ERR;
+
+		/* Wait until operation completed */
+		do {
+			/* Read I2C operation status */
+			temp = *(u32 *) (CFG_TSI108_CSR_BASE + TSI108_I2C_OFFSET + I2C_CNTRL2);
+
+			if (0 == (temp & (I2C_CNTRL2_WR_STATUS | I2C_CNTRL2_START))) {
+				if (0 == (temp &
+				     (I2C_CNTRL2_I2C_CFGERR |
+				      I2C_CNTRL2_I2C_TO_ERR))) {
+					op_status = TSI108_I2C_SUCCESS;
+				} else {
+					/* report detected HW error */
+					op_status = TSI108_I2C_IF_ERROR;
+
+					DPRINT (("I2C HW error reported: 0x%02x\n", temp));
+				}
+
+				break;
+			}
+
+		} while (to_count--);
+	} else {
+		op_status = TSI108_I2C_IF_BUSY;
+
+		DPRINT (("I2C Transaction start failed: 0x%02x\n", temp));
+	}
+
+	return op_status;
+}
+
+/*
+ * I2C Write interface as defined in "include/i2c.h" :
+ *   chip_addr: I2C chip address, range 0..127
+ *   byte_addr: Memory or register address within the chip
+ *   alen:      Number of bytes to use for addr (typically 1, 2 for larger
+ *              memories, 0 for register type devices with only one
+ *              register)
+ *   buffer:    Pointer to data to be written
+ *   len:       How many bytes to write
+ *
+ *   Returns: 0 on success, not 0 on failure
+ */
+
+int i2c_write (uchar chip_addr, uint byte_addr, int alen, uchar * buffer,
+	      int len)
+{
+	u32 op_status = TSI108_I2C_PARAM_ERR;
+
+	/* Check for valid I2C address */
+	if (chip_addr <= 0x7F && (byte_addr + len) <= (0x01 << (alen * 8))) {
+		while (len--) {
+			op_status =
+			    i2c_write_byte (chip_addr, byte_addr++, buffer++);
+
+			if (TSI108_I2C_SUCCESS != op_status) {
+				DPRINT (("I2C write_byte() failed: 0x%02x (%d left)\n", op_status, len));
+
+				break;
+			}
+		}
+	}
+
+	return op_status;
+}
+
+/*
+ * I2C interface function as defined in "include/i2c.h".
+ * Probe the given I2C chip address by reading single byte from offset 0.
+ * Returns 0 if a chip responded, not 0 on failure.
+ */
+
+int i2c_probe (uchar chip)
+{
+	u32 tmp;
+
+	/*
+	 * Try to read the first location of the chip.
+	 * The Tsi108 HW doesn't support sending just the chip address
+	 * and checkong for an <ACK> back.
+	 */
+	return i2c_read (chip, 0, 1, (uchar *)&tmp, 1);
+}
+
+#endif
+#endif /* CONFIG_TSI108_I2C */