[PATCH] OMAP: I2C driver for TI OMAP boards.

["Komal Shah" <komal_shah802003@yahoo.com>]

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Jean/Greg/Tony,

This patch adds I2C bus driver for various Texas
Instruments (TI) OMAP1/2 (http://www.ti.com/omap) series
based boards like OMAP1510/1610/1710/242x.

Please review it and give Ack if it is OK.

---Komal Shah
http://komalshah.blogspot.com

-- 
http://www.fastmail.fm - A fast, anti-spam email service.


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From nobody Mon Sep 17 00:00:00 2001
From: Komal Shah <komal_shah802003@yahoo.com>
Date: Wed, 26 Jul 2006 23:38:13 +0530
Subject: [PATCH] OMAP: I2C driver for TI OMAP boards.

This patch adds I2C bus driver for various Texas
Instruments (TI) OMAP1/2 (http://www.ti.com/omap) series
based boards like OMAP1510/1610/1710/242x.

Signed-off-by: Komal Shah <komal_shah802003@yahoo.com>

---

 drivers/i2c/busses/Kconfig    |    7 
 drivers/i2c/busses/Makefile   |    1 
 drivers/i2c/busses/i2c-omap.c |  716 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 724 insertions(+), 0 deletions(-)
 create mode 100644 drivers/i2c/busses/i2c-omap.c

f7296353df7e574a8ae3bf4c61156853b406e6a0
diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index 884320e..bf49c97 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -537,4 +537,11 @@ config I2C_MV64XXX
 	  This driver can also be built as a module.  If so, the module
 	  will be called i2c-mv64xxx.
 
+config I2C_OMAP
+	tristate "OMAP I2C adapter"
+	depends on I2C && ARCH_OMAP
+	default y if MACH_OMAP_H3 || MACH_OMAP_OSK
+	help
+	  Support for TI OMAP I2C driver. Say yes if you want to use the OMAP
+	  I2C interface.
 endmenu
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index ac56df5..2fd82e4 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -43,6 +43,7 @@ obj-$(CONFIG_I2C_VIAPRO)	+= i2c-viapro.o
 obj-$(CONFIG_I2C_VOODOO3)	+= i2c-voodoo3.o
 obj-$(CONFIG_SCx200_ACB)	+= scx200_acb.o
 obj-$(CONFIG_SCx200_I2C)	+= scx200_i2c.o
+obj-$(CONFIG_I2C_OMAP)		+= i2c-omap.o
 
 ifeq ($(CONFIG_I2C_DEBUG_BUS),y)
 EXTRA_CFLAGS += -DDEBUG
diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
new file mode 100644
index 0000000..7ea18ff
--- /dev/null
+++ b/drivers/i2c/busses/i2c-omap.c
@@ -0,0 +1,716 @@
+/*
+ * linux/drivers/i2c/busses/i2c-omap.c
+ *
+ * TI OMAP I2C master mode driver
+ *
+ * Copyright (C) 2003 MontaVista Software, Inc.
+ * Copyright (C) 2004 Texas Instruments.
+ *
+ * Updated to work with multiple I2C interfaces on 24xx by
+ * Tony Lindgren <tony@atomide.com> and Imre Deak <imre.deak@nokia.com>
+ * Copyright (C) 2005 Nokia Corporation
+ *
+ * Cleaned up by Juha Yrjölä <juha.yrjola@nokia.com>
+ *
+ * ----------------------------------------------------------------------------
+ * This file was highly leveraged from i2c-elektor.c:
+ *
+ * Copyright 1995-97 Simon G. Vogl
+ *           1998-99 Hans Berglund
+ *
+ * With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi> and even
+ * Frodo Looijaard <frodol@dds.nl>
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+// #define DEBUG
+
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/err.h>
+#include <linux/interrupt.h>
+#include <linux/completion.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+
+#include <asm/io.h>
+
+/* ----- global defines ----------------------------------------------- */
+static const char driver_name[] = "i2c_omap";
+
+#define MODULE_NAME "OMAP I2C"
+#define OMAP_I2C_TIMEOUT (msecs_to_jiffies(1000)) /* timeout waiting for the controller to respond */
+
+#define DEFAULT_OWN		1	/* default own I2C address */
+#define MAX_MESSAGES		65536	/* max number of messages */
+
+#define OMAP_I2C_REV_REG		0x00
+#define OMAP_I2C_IE_REG			0x04
+#define OMAP_I2C_STAT_REG		0x08
+#define OMAP_I2C_IV_REG			0x0c
+#define OMAP_I2C_SYSS_REG		0x10
+#define OMAP_I2C_BUF_REG		0x14
+#define OMAP_I2C_CNT_REG		0x18
+#define OMAP_I2C_DATA_REG		0x1c
+#define OMAP_I2C_SYSC_REG		0x20
+#define OMAP_I2C_CON_REG		0x24
+#define OMAP_I2C_OA_REG			0x28
+#define OMAP_I2C_SA_REG			0x2c
+#define OMAP_I2C_PSC_REG		0x30
+#define OMAP_I2C_SCLL_REG		0x34
+#define OMAP_I2C_SCLH_REG		0x38
+#define OMAP_I2C_SYSTEST_REG		0x3c
+
+/* I2C Interrupt Enable Register (OMAP_I2C_IE): */
+#define OMAP_I2C_IE_XRDY	(1 << 4)	/* TX data ready int enable */
+#define OMAP_I2C_IE_RRDY	(1 << 3)	/* RX data ready int enable */
+#define OMAP_I2C_IE_ARDY	(1 << 2)	/* Access ready int enable */
+#define OMAP_I2C_IE_NACK	(1 << 1)	/* No ack interrupt enable */
+#define OMAP_I2C_IE_AL		(1 << 0)	/* Arbitration lost int ena */
+
+/* I2C Status Register (OMAP_I2C_STAT): */
+#define OMAP_I2C_STAT_SBD	(1 << 15)	/* Single byte data */
+#define OMAP_I2C_STAT_BB	(1 << 12)	/* Bus busy */
+#define OMAP_I2C_STAT_ROVR	(1 << 11)	/* Receive overrun */
+#define OMAP_I2C_STAT_XUDF	(1 << 10)	/* Transmit underflow */
+#define OMAP_I2C_STAT_AAS	(1 << 9)	/* Address as slave */
+#define OMAP_I2C_STAT_AD0	(1 << 8)	/* Address zero */
+#define OMAP_I2C_STAT_XRDY	(1 << 4)	/* Transmit data ready */
+#define OMAP_I2C_STAT_RRDY	(1 << 3)	/* Receive data ready */
+#define OMAP_I2C_STAT_ARDY	(1 << 2)	/* Register access ready */
+#define OMAP_I2C_STAT_NACK	(1 << 1)	/* No ack interrupt enable */
+#define OMAP_I2C_STAT_AL	(1 << 0)	/* Arbitration lost int ena */
+
+/* I2C Buffer Configuration Register (OMAP_I2C_BUF): */
+#define OMAP_I2C_BUF_RDMA_EN	(1 << 15)	/* RX DMA channel enable */
+#define OMAP_I2C_BUF_XDMA_EN	(1 << 7)	/* TX DMA channel enable */
+
+/* I2C Configuration Register (OMAP_I2C_CON): */
+#define OMAP_I2C_CON_EN		(1 << 15)	/* I2C module enable */
+#define OMAP_I2C_CON_BE		(1 << 14)	/* Big endian mode */
+#define OMAP_I2C_CON_STB	(1 << 11)	/* Start byte mode (master) */
+#define OMAP_I2C_CON_MST	(1 << 10)	/* Master/slave mode */
+#define OMAP_I2C_CON_TRX	(1 << 9)	/* TX/RX mode (master only) */
+#define OMAP_I2C_CON_XA		(1 << 8)	/* Expand address */
+#define OMAP_I2C_CON_RM		(1 << 2)	/* Repeat mode (master only) */
+#define OMAP_I2C_CON_STP	(1 << 1)	/* Stop cond (master only) */
+#define OMAP_I2C_CON_STT	(1 << 0)	/* Start condition (master) */
+
+/* I2C System Test Register (OMAP_I2C_SYSTEST): */
+#define OMAP_I2C_SYSTEST_ST_EN		(1 << 15)	/* System test enable */
+#define OMAP_I2C_SYSTEST_FREE		(1 << 14)	/* Free running mode */
+#define OMAP_I2C_SYSTEST_TMODE_MASK	(3 << 12)	/* Test mode select */
+#define OMAP_I2C_SYSTEST_TMODE_SHIFT	(12)		/* Test mode select */
+#define OMAP_I2C_SYSTEST_SCL_I		(1 << 3)	/* SCL line sense in */
+#define OMAP_I2C_SYSTEST_SCL_O		(1 << 2)	/* SCL line drive out */
+#define OMAP_I2C_SYSTEST_SDA_I		(1 << 1)	/* SDA line sense in */
+#define OMAP_I2C_SYSTEST_SDA_O		(1 << 0)	/* SDA line drive out */
+
+/* I2C System Status register (OMAP_I2C_SYSS): */
+#define OMAP_I2C_SYSS_RDONE		1		/* Reset Done */
+
+/* I2C System Configuration Register (OMAP_I2C_SYSC): */
+#define OMAP_I2C_SYSC_SRST		(1 << 1)	/* Soft Reset */
+
+/* REVISIT: Use platform_data instead of module parameters */
+static int clock = 100;	/* Default: Fast Mode = 400 KHz, Standard = 100 KHz */
+module_param(clock, int, 0);
+MODULE_PARM_DESC(clock, "Set I2C clock in kHz: 100 or 400 (Fast Mode)");
+
+static int own;
+module_param(own, int, 0);
+MODULE_PARM_DESC(own, "Address of OMAP I2C master (0 for default == 1)");
+
+struct omap_i2c_dev {
+	struct device		*dev;
+	void __iomem		*base;		/* virtual */
+	int			irq;
+	struct clk		*iclk;		/* Interface clock */
+	struct clk		*fclk;		/* Functional clock */
+	struct completion	cmd_complete;
+	u16			cmd_err;
+	u8			*buf;
+	size_t			buf_len;
+	struct i2c_adapter	adapter;
+	unsigned		rev1:1;
+	u8			own_address;
+};
+
+static inline void omap_i2c_write_reg(struct omap_i2c_dev *i2c_dev,
+				      int reg, u16 val)
+{
+	__raw_writew(val, i2c_dev->base + reg);
+}
+
+static inline u16 omap_i2c_read_reg(struct omap_i2c_dev *i2c_dev, int reg)
+{
+	return __raw_readw(i2c_dev->base + reg);
+}
+
+static int omap_i2c_get_clocks(struct omap_i2c_dev *dev)
+{
+	if (cpu_is_omap16xx() || cpu_is_omap24xx()) {
+		dev->iclk = clk_get(dev->dev, "i2c_ick");
+		if (IS_ERR(dev->iclk))
+			return -ENODEV;
+	}
+
+	dev->fclk = clk_get(dev->dev, "i2c_fck");
+	if (IS_ERR(dev->fclk)) {
+		if (dev->iclk != NULL)
+			clk_put(dev->iclk);
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+static void omap_i2c_put_clocks(struct omap_i2c_dev *dev)
+{
+	clk_put(dev->fclk);
+	dev->fclk = NULL;
+	if (dev->iclk != NULL) {
+		clk_put(dev->iclk);
+		dev->iclk = NULL;
+	}
+}
+
+static void omap_i2c_enable_clocks(struct omap_i2c_dev *dev)
+{
+	if (dev->iclk != NULL)
+		clk_enable(dev->iclk);
+	clk_enable(dev->fclk);
+}
+
+static void omap_i2c_disable_clocks(struct omap_i2c_dev *dev)
+{
+	if (dev->iclk != NULL)
+		clk_disable(dev->iclk);
+	clk_disable(dev->fclk);
+}
+
+static void omap_i2c_reset(struct omap_i2c_dev *dev)
+{
+	u16 psc;
+	unsigned long fclk_rate;
+
+	if (!dev->rev1) {
+		omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG, OMAP_I2C_SYSC_SRST);
+		/* For some reason we need to set the EN bit before the
+		 * reset done bit gets set. */
+		omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_EN);
+		while (!(omap_i2c_read_reg(dev, OMAP_I2C_SYSS_REG) & 0x01));
+	}
+	omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0);
+
+	if (cpu_class_is_omap1()) {
+		struct clk *armxor_ck;
+		unsigned long armxor_rate;
+
+		armxor_ck = clk_get(NULL, "armxor_ck");
+		if (IS_ERR(armxor_ck)) {
+			printk(KERN_WARNING "i2c: Could not get armxor_ck\n");
+			armxor_rate = 12000000;
+		} else {
+			armxor_rate = clk_get_rate(armxor_ck);
+			clk_put(armxor_ck);
+		}
+
+		if (armxor_rate > 16000000)
+			psc = (armxor_rate + 8000000) / 12000000;
+		else
+			psc = 0;
+
+		fclk_rate = armxor_rate;
+	} else if (cpu_class_is_omap2()) {
+		fclk_rate = 12000000;
+		psc = 0;
+	}
+
+	/* Setup clock prescaler to obtain approx 12MHz I2C module clock: */
+	omap_i2c_write_reg(dev, OMAP_I2C_PSC_REG, psc);
+
+	/* Program desired operating rate */
+	fclk_rate /= (psc + 1) * 1000;
+	if (psc > 2)
+		psc = 2;
+
+	omap_i2c_write_reg(dev, OMAP_I2C_SCLL_REG,
+			   fclk_rate / (clock * 2) - 7 + psc);
+	omap_i2c_write_reg(dev, OMAP_I2C_SCLH_REG,
+			   fclk_rate / (clock * 2) - 7 + psc);
+
+	/* Set Own Address: */
+	omap_i2c_write_reg(dev, OMAP_I2C_OA_REG, dev->own_address);
+
+	/* Take the I2C module out of reset: */
+	omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_EN);
+
+	/* Enable interrupts */
+	omap_i2c_write_reg(dev, OMAP_I2C_IE_REG,
+			   (OMAP_I2C_IE_XRDY | OMAP_I2C_IE_RRDY |
+			    OMAP_I2C_IE_ARDY | OMAP_I2C_IE_NACK |
+			    OMAP_I2C_IE_AL));
+}
+
+/*
+ * Waiting on Bus Busy
+ */
+static int omap_i2c_wait_for_bb(struct omap_i2c_dev *dev)
+{
+	unsigned long timeout;
+
+	timeout = jiffies + OMAP_I2C_TIMEOUT;
+	while (omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG) & OMAP_I2C_STAT_BB) {
+		if (time_after(jiffies, timeout)) {
+			dev_warn(dev->dev, "timeout waiting for bus ready\n");
+			return -ETIMEDOUT;
+		}
+		msleep(1);
+	}
+
+	return 0;
+}
+
+/*
+ * Low level master read/write transaction.
+ */
+static int omap_i2c_xfer_msg(struct i2c_adapter *adap,
+			     struct i2c_msg *msg, int stop)
+{
+	struct omap_i2c_dev *dev = i2c_get_adapdata(adap);
+	int r;
+	u16 w;
+	u8 zero_byte = 0;
+
+	dev_dbg(dev->dev, "addr: 0x%04x, len: %d, flags: 0x%x, stop: %d\n",
+		msg->addr, msg->len, msg->flags, stop);
+
+	omap_i2c_write_reg(dev, OMAP_I2C_SA_REG, msg->addr);
+
+	/* Sigh, seems we can't do zero length transactions. Thus, we
+	 * can't probe for devices w/o actually sending/receiving at least
+	 * a single byte. So we'll set count to 1 for the zero length
+	 * transaction case and hope we don't cause grief for some
+	 * arbitrary device due to random byte write/read during
+	 * probes.
+	 */
+	/* REVISIT: Could the STB bit of I2C_CON be used with probing? */
+	if (msg->len == 0) {
+		dev->buf = &zero_byte;
+		dev->buf_len = 1;
+	} else {
+		dev->buf = msg->buf;
+		dev->buf_len = msg->len;
+	}
+	omap_i2c_write_reg(dev, OMAP_I2C_CNT_REG, dev->buf_len);
+
+	init_completion(&dev->cmd_complete);
+	dev->cmd_err = 0;
+
+	w = OMAP_I2C_CON_EN | OMAP_I2C_CON_MST | OMAP_I2C_CON_STT;
+	if (msg->flags & I2C_M_TEN)
+		w |= OMAP_I2C_CON_XA;
+	if (!(msg->flags & I2C_M_RD))
+		w |= OMAP_I2C_CON_TRX;
+	if (stop)
+		w |= OMAP_I2C_CON_STP;
+	omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, w);
+
+	r = wait_for_completion_interruptible_timeout(&dev->cmd_complete,
+						      OMAP_I2C_TIMEOUT);
+	dev->buf_len = 0;
+	if (r < 0)
+		return r;
+	if (r == 0) {
+		dev_err(dev->dev, "controller timed out\n");
+		omap_i2c_reset(dev);
+		return -ETIMEDOUT;
+	}
+
+	if (likely(!dev->cmd_err))
+		return 0;
+
+	/* We have an error */
+	if (dev->cmd_err & OMAP_I2C_STAT_NACK) {
+		if (msg->flags & I2C_M_IGNORE_NAK)
+			return 0;
+		if (stop) {
+			u16 w;
+
+			w = omap_i2c_read_reg(dev, OMAP_I2C_CON_REG);
+			w |= OMAP_I2C_CON_STP;
+			omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, w);
+		}
+		return -EREMOTEIO;
+	}
+	if (dev->cmd_err & (OMAP_I2C_STAT_AL | OMAP_I2C_STAT_ROVR |
+			    OMAP_I2C_STAT_XUDF))
+		omap_i2c_reset(dev);
+	return -EIO;
+}
+
+
+/*
+ * Prepare controller for a transaction and call omap_i2c_xfer_msg
+ * to do the work during IRQ processing.
+ */
+static int
+omap_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
+{
+	struct omap_i2c_dev *dev = i2c_get_adapdata(adap);
+	int i;
+	int r = 0;
+
+	if (num < 1 || num > MAX_MESSAGES)
+		return -EINVAL;
+
+	/* Check for valid parameters in messages */
+	for (i = 0; i < num; i++)
+		if (msgs[i].buf == NULL)
+			return -EINVAL;
+
+	omap_i2c_enable_clocks(dev);
+
+	/* REVISIT: initialize and use adap->retries */
+	if ((r = omap_i2c_wait_for_bb(dev)) < 0)
+		goto out;
+
+	for (i = 0; i < num; i++) {
+		dev_dbg(dev->dev, "msg: %d, addr: 0x%04x, len: %d, flags: 0x%x\n",
+			i, msgs[i].addr, msgs[i].len, msgs[i].flags);
+		r = omap_i2c_xfer_msg(adap, &msgs[i], (i == (num - 1)));
+		if (r != 0)
+			break;
+	}
+
+	if (r == 0)
+		r = num;
+out:
+	omap_i2c_disable_clocks(dev);
+	return r;
+}
+
+static u32
+omap_i2c_func(struct i2c_adapter *adap)
+{
+	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+static inline void
+omap_i2c_complete_cmd(struct omap_i2c_dev *dev, u16 err)
+{
+	dev->cmd_err |= err;
+	complete(&dev->cmd_complete);
+}
+
+static inline void
+omap_i2c_ack_stat(struct omap_i2c_dev *dev, u16 stat)
+{
+	omap_i2c_write_reg(dev, OMAP_I2C_STAT_REG, stat);
+}
+
+#ifdef CONFIG_ARCH_OMAP15XX
+static irqreturn_t
+omap_i2c_rev1_isr(int this_irq, void *dev_id, struct pt_regs *regs)
+{
+	struct omap_i2c_dev *dev = dev_id;
+	u16 iv, w;
+
+	iv = omap_i2c_read_reg(dev, OMAP_I2C_IV_REG);
+	switch (iv) {
+	case 0x00:	/* None */
+		break;
+	case 0x01:	/* Arbitration lost */
+		dev_err(dev->dev, "Arbitration lost\n");
+		omap_i2c_complete_cmd(dev, OMAP_I2C_STAT_AL);
+		break;
+	case 0x02:	/* No acknowledgement */
+		omap_i2c_complete_cmd(dev, OMAP_I2C_STAT_NACK);
+		omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_STP);
+		break;
+	case 0x03:	/* Register access ready */
+		omap_i2c_complete_cmd(dev, 0);
+		break;
+	case 0x04:	/* Receive data ready */
+		if (dev->buf_len) {
+			w = omap_i2c_read_reg(dev, OMAP_I2C_DATA_REG);
+			*dev->buf++ = w;
+			dev->buf_len--;
+			if (dev->buf_len) {
+				*dev->buf++ = w >> 8;
+				dev->buf_len--;
+			}
+		} else
+			dev_err(dev->dev, "RRDY IRQ while no data requested\n");
+		break;
+	case 0x05:	/* Transmit data ready */
+		if (dev->buf_len) {
+			w = *dev->buf++;
+			dev->buf_len--;
+			if (dev->buf_len) {
+				w |= *dev->buf++ << 8;
+				dev->buf_len--;
+			}
+			omap_i2c_write_reg(dev, OMAP_I2C_DATA_REG, w);
+		} else
+			dev_err(dev->dev, "XRDY IRQ while no data to send\n");
+		break;
+	default:
+		return IRQ_NONE;
+	}
+
+	return IRQ_HANDLED;
+}
+#endif
+
+static irqreturn_t
+omap_i2c_isr(int this_irq, void *dev_id, struct pt_regs *regs)
+{
+	struct omap_i2c_dev *dev = dev_id;
+	u16 bits;
+	u16 stat, w;
+	int count = 0;
+
+	bits = omap_i2c_read_reg(dev, OMAP_I2C_IE_REG);
+	while ((stat = (omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG))) & bits) {
+		dev_dbg(dev->dev, "IRQ (ISR = 0x%04x)\n", stat);
+		if (count++ == 100) {
+			dev_warn(dev->dev, "Too much work in one IRQ\n");
+			break;
+		}
+
+		omap_i2c_write_reg(dev, OMAP_I2C_STAT_REG, stat);
+
+		if (stat & OMAP_I2C_STAT_ARDY) {
+			omap_i2c_complete_cmd(dev, 0);
+			continue;
+		}
+		if (stat & OMAP_I2C_STAT_RRDY) {
+			w = omap_i2c_read_reg(dev, OMAP_I2C_DATA_REG);
+			if (dev->buf_len) {
+				*dev->buf++ = w;
+				dev->buf_len--;
+				if (dev->buf_len) {
+					*dev->buf++ = w >> 8;
+					dev->buf_len--;
+				}
+			} else
+				dev_err(dev->dev, "RRDY IRQ while no data requested\n");
+			omap_i2c_ack_stat(dev, OMAP_I2C_STAT_RRDY);
+			continue;
+		}
+		if (stat & OMAP_I2C_STAT_XRDY) {
+			int bail_out = 0;
+
+			w = 0;
+			if (dev->buf_len) {
+				w = *dev->buf++;
+				dev->buf_len--;
+				if (dev->buf_len) {
+					w |= *dev->buf++ << 8;
+					dev->buf_len--;
+				}
+			} else
+				dev_err(dev->dev, "XRDY IRQ while no data to send\n");
+#if 0
+			if (!(stat & OMAP_I2C_STAT_BB)) {
+				dev_warn(dev->dev, "XRDY while bus not busy\n");
+				bail_out = 1;
+			}
+#endif
+			omap_i2c_write_reg(dev, OMAP_I2C_DATA_REG, w);
+			omap_i2c_ack_stat(dev, OMAP_I2C_STAT_XRDY);
+			if (bail_out)
+				omap_i2c_complete_cmd(dev, 1 << 15);
+			continue;
+		}
+		if (stat & OMAP_I2C_STAT_ROVR) {
+			dev_err(dev->dev, "Receive overrun\n");
+			dev->cmd_err |= OMAP_I2C_STAT_ROVR;
+		}
+		if (stat & OMAP_I2C_STAT_XUDF) {
+			dev_err(dev->dev, "Transmit overflow\n");
+			dev->cmd_err |= OMAP_I2C_STAT_XUDF;
+		}
+		if (stat & OMAP_I2C_STAT_NACK) {
+			omap_i2c_complete_cmd(dev, OMAP_I2C_STAT_NACK);
+			omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_STP);
+		}
+		if (stat & OMAP_I2C_STAT_AL) {
+			dev_err(dev->dev, "Arbitration lost\n");
+			omap_i2c_complete_cmd(dev, OMAP_I2C_STAT_AL);
+		}
+	}
+
+	return count ? IRQ_HANDLED : IRQ_NONE;
+}
+
+static struct i2c_algorithm omap_i2c_algo = {
+	.master_xfer	= omap_i2c_xfer,
+	.functionality	= omap_i2c_func,
+};
+
+static int
+omap_i2c_probe(struct platform_device *pdev)
+{
+	struct omap_i2c_dev	*dev;
+	struct i2c_adapter	*adap;
+	struct resource		*mem, *irq;
+	int r;
+
+	/* NOTE: driver uses the static register mapping */
+	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!mem) {
+		dev_err(&pdev->dev, "no mem resource?\n");
+		return -ENODEV;
+	}
+	irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+	if (!irq) {
+		dev_err(&pdev->dev, "no irq resource?\n");
+		return -ENODEV;
+	}
+
+	r = (int) request_mem_region(mem->start, (mem->end - mem->start) + 1,
+			driver_name);
+	if (!r) {
+		dev_err(&pdev->dev, "I2C region already claimed\n");
+		return -EBUSY;
+	}
+
+	if (clock > 200)
+		clock = 400;	/* Fast mode */
+	else
+		clock = 100;	/* Standard mode */
+
+	dev = kzalloc(sizeof(struct omap_i2c_dev), GFP_KERNEL);
+	if (!dev) {
+		r = -ENOMEM;
+		goto do_release_region;
+	}
+
+	/* FIXME: Get own address from platform_data */
+	if (own >= 1 && own < 0x7f)
+		dev->own_address = own;
+	else
+		own = DEFAULT_OWN;
+
+	dev->dev = &pdev->dev;
+	dev->irq = irq->start;
+	dev->base = (void __iomem *) IO_ADDRESS(mem->start);
+	platform_set_drvdata(pdev, dev);
+
+	if ((r = omap_i2c_get_clocks(dev)) != 0)
+		goto do_free_mem;
+
+	omap_i2c_enable_clocks(dev);
+
+#ifdef CONFIG_ARCH_OMAP15XX
+	dev->rev1 = omap_i2c_read_reg(dev, OMAP_I2C_REV_REG) < 0x20;
+#endif
+
+	/* reset ASAP, clearing any IRQs */
+	omap_i2c_reset(dev);
+
+#ifdef CONFIG_ARCH_OMAP15XX
+	r = request_irq(dev->irq, dev->rev1 ? omap_i2c_rev1_isr : omap_i2c_isr,
+			0, driver_name, dev);
+#else
+	r = request_irq(dev->irq, omap_i2c_isr, 0, driver_name, dev);
+#endif
+	if (r) {
+		dev_err(dev->dev, "failure requesting irq %i\n", dev->irq);
+		goto do_unuse_clocks;
+	}
+	r = omap_i2c_read_reg(dev, OMAP_I2C_REV_REG) & 0xff;
+	dev_info(dev->dev, "bus %d rev%d.%d at %d kHz\n",
+		 pdev->id - 1, r >> 4, r & 0xf, clock);
+
+	adap = &dev->adapter;
+	i2c_set_adapdata(adap, dev);
+	adap->owner = THIS_MODULE;
+	adap->class = I2C_CLASS_HWMON;
+	strncpy(adap->name, "OMAP I2C adapter", sizeof(adap->name));
+	adap->algo = &omap_i2c_algo;
+	adap->dev.parent = &pdev->dev;
+
+	/* i2c device drivers may be active on return from add_adapter() */
+	r = i2c_add_adapter(adap);
+	if (r) {
+		dev_err(dev->dev, "failure adding adapter\n");
+		goto do_free_irq;
+	}
+
+	omap_i2c_disable_clocks(dev);
+
+	return 0;
+
+do_free_irq:
+	free_irq(dev->irq, dev);
+do_unuse_clocks:
+	omap_i2c_disable_clocks(dev);
+	omap_i2c_put_clocks(dev);
+do_free_mem:
+	kfree(dev);
+do_release_region:
+	omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0);
+	release_mem_region(mem->start, (mem->end - mem->start) + 1);
+
+	return r;
+}
+
+static int
+omap_i2c_remove(struct platform_device *pdev)
+{
+	struct omap_i2c_dev	*dev = platform_get_drvdata(pdev);
+	struct resource		*mem;
+
+	free_irq(dev->irq, dev);
+	i2c_del_adapter(&dev->adapter);
+	omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0);
+	omap_i2c_put_clocks(dev);
+	kfree(dev);
+	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	release_mem_region(mem->start, (mem->end - mem->start) + 1);
+	return 0;
+}
+
+static struct platform_driver omap_i2c_driver = {
+	.probe		= omap_i2c_probe,
+	.remove		= omap_i2c_remove,
+	.driver 	= {
+		.name	= (char *)driver_name,
+	},
+};
+
+/* I2C may be needed to bring up other drivers */
+static int __init
+omap_i2c_init_driver(void)
+{
+	return platform_driver_register(&omap_i2c_driver);
+}
+subsys_initcall(omap_i2c_init_driver);
+
+static void __exit omap_i2c_exit_driver(void)
+{
+	platform_driver_unregister(&omap_i2c_driver);
+}
+module_exit(omap_i2c_exit_driver);
+
+MODULE_AUTHOR("MontaVista Software, Inc. (and others)");
+MODULE_DESCRIPTION("TI OMAP I2C bus adapter");
+MODULE_LICENSE("GPL");
-- 
1.3.3