I2C driver for IMX

Changes from V7 version:

- .remove function now is declarated with __devexit

Signed-off-by Darius Augulis <[email protected]>

---

Index: linux-2.6.26-rc8/arch/arm/mach-imx/mx1ads.c
===================================================================

arch/arm/mach-imx/mx1ads.c +21 -0

@@ -109,10 +109,31 @@ static struct platform_device imx_uart2_
 	}
 };
 
+static struct resource imx_i2c_resources[] = {
+	[0] = {
+		.start  = 0x00217000,
+		.end    = 0x00217010,
+		.flags  = IORESOURCE_MEM,
+	},
+	[1] = {
+		.start  = I2C_INT,
+		.end    = I2C_INT,
+		.flags  = IORESOURCE_IRQ,
+	},
+};
+
+static struct platform_device imx_i2c_device = {
+	.name           = "imx-i2c",
+	.id             = 0,
+	.resource       = imx_i2c_resources,
+	.num_resources  = ARRAY_SIZE(imx_i2c_resources),
+};
+
 static struct platform_device *devices[] __initdata = {
 	&cs89x0_device,
 	&imx_uart1_device,
 	&imx_uart2_device,
+	&imx_i2c_device,
 };
 
 #ifdef CONFIG_MMC_IMX

Index: linux-2.6.26-rc8/drivers/i2c/busses/i2c-imx.c
===================================================================

drivers/i2c/busses/i2c-imx.c new file +23 -0

@@ -0,0 +1,629 @@
+/*
+ *	Copyright (C) 2002 Motorola GSG-China
+ *
+ *	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.
+ *
+ * Author:
+ *	Darius Augulis, Teltonika Inc.
+ *
+ * Desc.:
+ *	Implementation of I2C Adapter/Algorithm Driver

drivers/i2c/busses/i2c-imx.c new file +8 -0

+ *
+ *	Derived from Motorola GSG China I2C example driver
+ *
+ *	Copyright (C) 2005 Torsten Koschorrek <koschorrek at synertronixx.de
+ *	Portions:
+ *	Copyright (C) 2005 Matthias Blaschke <blaschke at synertronixx.de
+ *	Copyright (C) 2007 RightHand Technologies, Inc. <adyeratrighthandtech.com>
+ *	Copyright (C) 2008 Darius Augulis <darius.augulis at teltonika.lt>

drivers/i2c/busses/i2c-imx.c new file +20 -0

+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/io.h>
+#include <linux/platform_device.h>
+#include <asm/arch/irqs.h>
+#include <asm/arch/hardware.h>
+#include <asm/arch/imx-regs.h>
+
+/** Defines ********************************************************************
+*******************************************************************************/
+
+/* This will be the driver name the kernel reports */
+#define DRIVER_NAME "imx-i2c"
+
+/* Default values of module parameters */
+#define IMX_I2C_SLAVE_ADDR	0xAC
+#define IMX_I2C_BIT_RATE	100000	/* 100kHz */
+

drivers/i2c/busses/i2c-imx.c new file +9 -0

+
+static int i2c_imx_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, int num)
+{
+	unsigned int i, temp;
+	int err = 0;
+	struct imx_i2c_struct *i2c_imx = i2c_get_adapdata(adapter);
+
+	dev_dbg(&i2c_imx->adapter.dev, "<%s>\n", __func__);
+

drivers/i2c/busses/i2c-imx.c new file +22 -0

+
+	temp = readb(i2c_imx->base + IMX_I2C_I2CR);
+
+	/* read/write data */
+	for (i = 0; i < num; i++) {
+		if (i) {
+			dev_dbg(&i2c_imx->adapter.dev,
+				"<%s> repeated start\n", __func__);
+			temp = readb(i2c_imx->base + IMX_I2C_I2CR);
+			temp |= I2CR_RSTA;
+			writeb(temp, i2c_imx->base + IMX_I2C_I2CR);
+		}
+		dev_dbg(&i2c_imx->adapter.dev,
+			"<%s> transfer message: %d\n", __func__, i);
+		/* write/read data */
+#ifdef CONFIG_I2C_DEBUG_BUS
+		temp = readb(i2c_imx->base + IMX_I2C_I2CR);
+		dev_dbg(&i2c_imx->adapter.dev, "<%s> CONTROL: IEN=%d, IIEN=%d, "
+			"MSTA=%d, MTX=%d, TXAK=%d, RSTA=%d\n", __func__,
+			(temp&I2CR_IEN ? 1 : 0), (temp&I2CR_IIEN ? 1 : 0),
+			(temp&I2CR_MSTA ? 1 : 0), (temp&I2CR_MTX ? 1 : 0),
+			(temp&I2CR_TXAK ? 1 : 0), (temp&I2CR_RSTA ? 1 : 0));

drivers/i2c/busses/i2c-imx.c new file +15 -0

+			err = i2c_imx_write(i2c_imx, &msgs[i]);
+		else
+			err = i2c_imx_read(i2c_imx, &msgs[i]);
+	}
+
+fail0:
+	/* Stop bus */
+	i2c_imx_stop(i2c_imx);
+	/* disable i2c bus */
+	i2c_imx_disable(i2c_imx);
+	dev_dbg(&i2c_imx->adapter.dev, "<%s> exit with: %s: %d\n", __func__,
+		(err < 0) ? "error" : "success msg", (err < 0) ? err : num);
+	return (err < 0) ? err : num;
+}
+