arch/arm/plat-omap/i2c.c - linux - Git at Google

 /*
  * linux/arch/arm/plat-omap/i2c.c
  *
  * Helper module for board specific I2C bus registration
  *
  * Copyright (C) 2007 Nokia Corporation.
  *
  * Contact: Jarkko Nikula <jhnikula@gmail.com>
  *
  * 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., 51 Franklin St, Fifth Floor, Boston, MA
  * 02110-1301 USA
  *
  */

 #include <linux/kernel.h>
 #include <linux/platform_device.h>
 #include <linux/i2c.h>
 #include <linux/i2c-omap.h>

 #include <mach/irqs.h>
 #include <plat/mux.h>
 #include <plat/i2c.h>
 #include <plat/omap-pm.h>

 #define OMAP_I2C_SIZE		0x3f
 #define OMAP1_I2C_BASE		0xfffb3800
 #define OMAP2_I2C_BASE1		0x48070000
 #define OMAP2_I2C_BASE2		0x48072000
 #define OMAP2_I2C_BASE3		0x48060000
 #define OMAP4_I2C_BASE4		0x48350000

 static const char name[] = "i2c_omap";

 #define I2C_RESOURCE_BUILDER(base, irq)			\
 	{						\
 		.start	= (base),			\
 		.end	= (base) + OMAP_I2C_SIZE,	\
 		.flags	= IORESOURCE_MEM,		\
 	},						\
 	{						\
 		.start	= (irq),			\
 		.flags	= IORESOURCE_IRQ,		\
 	},

 static struct resource i2c_resources[][2] = {
 	{ I2C_RESOURCE_BUILDER(0, 0) },
 #if	defined(CONFIG_ARCH_OMAP2PLUS)
 	{ I2C_RESOURCE_BUILDER(OMAP2_I2C_BASE2, 0) },
 #endif
 #if	defined(CONFIG_ARCH_OMAP3) || defined(CONFIG_ARCH_OMAP4)
 	{ I2C_RESOURCE_BUILDER(OMAP2_I2C_BASE3, 0) },
 #endif
 #if	defined(CONFIG_ARCH_OMAP4)
 	{ I2C_RESOURCE_BUILDER(OMAP4_I2C_BASE4, 0) },
 #endif
 };

 #define I2C_DEV_BUILDER(bus_id, res, data)		\
 	{						\
 		.id	= (bus_id),			\
 		.name	= name,				\
 		.num_resources	= ARRAY_SIZE(res),	\
 		.resource	= (res),		\
 		.dev		= {			\
 			.platform_data	= (data),	\
 		},					\
 	}

 static struct omap_i2c_bus_platform_data i2c_pdata[ARRAY_SIZE(i2c_resources)];
 static struct platform_device omap_i2c_devices[] = {
 	I2C_DEV_BUILDER(1, i2c_resources[0], &i2c_pdata[0]),
 #if	defined(CONFIG_ARCH_OMAP2PLUS)
 	I2C_DEV_BUILDER(2, i2c_resources[1], &i2c_pdata[1]),
 #endif
 #if	defined(CONFIG_ARCH_OMAP3) || defined(CONFIG_ARCH_OMAP4)
 	I2C_DEV_BUILDER(3, i2c_resources[2], &i2c_pdata[2]),
 #endif
 #if	defined(CONFIG_ARCH_OMAP4)
 	I2C_DEV_BUILDER(4, i2c_resources[3], &i2c_pdata[3]),
 #endif
 };

 #define OMAP_I2C_CMDLINE_SETUP	(BIT(31))

 static int __init omap_i2c_nr_ports(void)
 {
 	int ports = 0;

 	if (cpu_class_is_omap1())
 		ports = 1;
 	else if (cpu_is_omap24xx())
 		ports = 2;
 	else if (cpu_is_omap34xx())
 		ports = 3;
 	else if (cpu_is_omap44xx())
 		ports = 4;

 	return ports;
 }

 /* Shared between omap2 and 3 */
 static resource_size_t omap2_i2c_irq[3] __initdata = {
 	INT_24XX_I2C1_IRQ,
 	INT_24XX_I2C2_IRQ,
 	INT_34XX_I2C3_IRQ,
 };

 static resource_size_t omap4_i2c_irq[4] __initdata = {
 	OMAP44XX_IRQ_I2C1,
 	OMAP44XX_IRQ_I2C2,
 	OMAP44XX_IRQ_I2C3,
 	OMAP44XX_IRQ_I2C4,
 };

 static inline int omap1_i2c_add_bus(struct platform_device *pdev, int bus_id)
 {
 	struct omap_i2c_bus_platform_data *pd;
 	struct resource *res;

 	pd = pdev->dev.platform_data;
 	res = pdev->resource;
 	res[0].start = OMAP1_I2C_BASE;
 	res[0].end = res[0].start + OMAP_I2C_SIZE;
 	res[1].start = INT_I2C;
 	omap1_i2c_mux_pins(bus_id);

 	return platform_device_register(pdev);
 }

 /*
  * XXX This function is a temporary compatibility wrapper - only
  * needed until the I2C driver can be converted to call
  * omap_pm_set_max_dev_wakeup_lat() and handle a return code.
  */
 static void omap_pm_set_max_mpu_wakeup_lat_compat(struct device *dev, long t)
 {
 	omap_pm_set_max_mpu_wakeup_lat(dev, t);
 }

 static inline int omap2_i2c_add_bus(struct platform_device *pdev, int bus_id)
 {
 	struct resource *res;
 	resource_size_t *irq;

 	res = pdev->resource;

 	if (!cpu_is_omap44xx())
 		irq = omap2_i2c_irq;
 	else
 		irq = omap4_i2c_irq;

 	if (bus_id == 1) {
 		res[0].start = OMAP2_I2C_BASE1;
 		res[0].end = res[0].start + OMAP_I2C_SIZE;
 	}

 	res[1].start = irq[bus_id - 1];
 	omap2_i2c_mux_pins(bus_id);

 	/*
 	 * When waiting for completion of a i2c transfer, we need to
 	 * set a wake up latency constraint for the MPU. This is to
 	 * ensure quick enough wakeup from idle, when transfer
 	 * completes.
 	 */
 	if (cpu_is_omap34xx()) {
 		struct omap_i2c_bus_platform_data *pd;

 		pd = pdev->dev.platform_data;
 		pd->set_mpu_wkup_lat = omap_pm_set_max_mpu_wakeup_lat_compat;
 	}

 	return platform_device_register(pdev);
 }

 static int __init omap_i2c_add_bus(int bus_id)
 {
 	struct platform_device *pdev;

 	pdev = &omap_i2c_devices[bus_id - 1];

 	if (cpu_class_is_omap1())
 		return omap1_i2c_add_bus(pdev, bus_id);
 	else
 		return omap2_i2c_add_bus(pdev, bus_id);
 }

 /**
  * omap_i2c_bus_setup - Process command line options for the I2C bus speed
  * @str: String of options
  *
  * This function allow to override the default I2C bus speed for given I2C
  * bus with a command line option.
  *
  * Format: i2c_bus=bus_id,clkrate (in kHz)
  *
  * Returns 1 on success, 0 otherwise.
  */
 static int __init omap_i2c_bus_setup(char *str)
 {
 	int ports;
 	int ints[3];

 	ports = omap_i2c_nr_ports();
 	get_options(str, 3, ints);
 	if (ints[0] < 2 || ints[1] < 1 || ints[1] > ports)
 		return 0;
 	i2c_pdata[ints[1] - 1].clkrate = ints[2];
 	i2c_pdata[ints[1] - 1].clkrate |= OMAP_I2C_CMDLINE_SETUP;

 	return 1;
 }
 __setup("i2c_bus=", omap_i2c_bus_setup);

 /*
  * Register busses defined in command line but that are not registered with
  * omap_register_i2c_bus from board initialization code.
  */
 static int __init omap_register_i2c_bus_cmdline(void)
 {
 	int i, err = 0;

 	for (i = 0; i < ARRAY_SIZE(i2c_pdata); i++)
 		if (i2c_pdata[i].clkrate & OMAP_I2C_CMDLINE_SETUP) {
 			i2c_pdata[i].clkrate &= ~OMAP_I2C_CMDLINE_SETUP;
 			err = omap_i2c_add_bus(i + 1);
 			if (err)
 				goto out;
 		}

 out:
 	return err;
 }
 subsys_initcall(omap_register_i2c_bus_cmdline);

 /**
  * omap_register_i2c_bus - register I2C bus with device descriptors
  * @bus_id: bus id counting from number 1
  * @clkrate: clock rate of the bus in kHz
  * @info: pointer into I2C device descriptor table or NULL
  * @len: number of descriptors in the table
  *
  * Returns 0 on success or an error code.
  */
 int __init omap_register_i2c_bus(int bus_id, u32 clkrate,
 			  struct i2c_board_info const *info,
 			  unsigned len)
 {
 	int err;

 	BUG_ON(bus_id < 1 || bus_id > omap_i2c_nr_ports());

 	if (info) {
 		err = i2c_register_board_info(bus_id, info, len);
 		if (err)
 			return err;
 	}

 	if (!i2c_pdata[bus_id - 1].clkrate)
 		i2c_pdata[bus_id - 1].clkrate = clkrate;

 	i2c_pdata[bus_id - 1].clkrate &= ~OMAP_I2C_CMDLINE_SETUP;

 	return omap_i2c_add_bus(bus_id);
 }
	/*
	* linux/arch/arm/plat-omap/i2c.c
	*
	* Helper module for board specific I2C bus registration
	*
	* Copyright (C) 2007 Nokia Corporation.
	*
	* Contact: Jarkko Nikula <jhnikula@gmail.com>
	*
	* 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., 51 Franklin St, Fifth Floor, Boston, MA
	* 02110-1301 USA
	*
	*/

	#include <linux/kernel.h>
	#include <linux/platform_device.h>
	#include <linux/i2c.h>
	#include <linux/i2c-omap.h>

	#include <mach/irqs.h>
	#include <plat/mux.h>
	#include <plat/i2c.h>
	#include <plat/omap-pm.h>

	#define OMAP_I2C_SIZE 0x3f
	#define OMAP1_I2C_BASE 0xfffb3800
	#define OMAP2_I2C_BASE1 0x48070000
	#define OMAP2_I2C_BASE2 0x48072000
	#define OMAP2_I2C_BASE3 0x48060000
	#define OMAP4_I2C_BASE4 0x48350000

	static const char name[] = "i2c_omap";

	#define I2C_RESOURCE_BUILDER(base, irq) \
	{ \
	.start = (base), \
	.end = (base) + OMAP_I2C_SIZE, \
	.flags = IORESOURCE_MEM, \
	}, \
	{ \
	.start = (irq), \
	.flags = IORESOURCE_IRQ, \
	},

	static struct resource i2c_resources[][2] = {
	{ I2C_RESOURCE_BUILDER(0, 0) },
	#if defined(CONFIG_ARCH_OMAP2PLUS)
	{ I2C_RESOURCE_BUILDER(OMAP2_I2C_BASE2, 0) },
	#endif
	#if defined(CONFIG_ARCH_OMAP3) \|\| defined(CONFIG_ARCH_OMAP4)
	{ I2C_RESOURCE_BUILDER(OMAP2_I2C_BASE3, 0) },
	#endif
	#if defined(CONFIG_ARCH_OMAP4)
	{ I2C_RESOURCE_BUILDER(OMAP4_I2C_BASE4, 0) },
	#endif
	};

	#define I2C_DEV_BUILDER(bus_id, res, data) \
	{ \
	.id = (bus_id), \
	.name = name, \
	.num_resources = ARRAY_SIZE(res), \
	.resource = (res), \
	.dev = { \
	.platform_data = (data), \
	}, \
	}

	static struct omap_i2c_bus_platform_data i2c_pdata[ARRAY_SIZE(i2c_resources)];
	static struct platform_device omap_i2c_devices[] = {
	I2C_DEV_BUILDER(1, i2c_resources[0], &i2c_pdata[0]),
	#if defined(CONFIG_ARCH_OMAP2PLUS)
	I2C_DEV_BUILDER(2, i2c_resources[1], &i2c_pdata[1]),
	#endif
	#if defined(CONFIG_ARCH_OMAP3) \|\| defined(CONFIG_ARCH_OMAP4)
	I2C_DEV_BUILDER(3, i2c_resources[2], &i2c_pdata[2]),
	#endif
	#if defined(CONFIG_ARCH_OMAP4)
	I2C_DEV_BUILDER(4, i2c_resources[3], &i2c_pdata[3]),
	#endif
	};

	#define OMAP_I2C_CMDLINE_SETUP (BIT(31))

	static int __init omap_i2c_nr_ports(void)
	{
	int ports = 0;

	if (cpu_class_is_omap1())
	ports = 1;
	else if (cpu_is_omap24xx())
	ports = 2;
	else if (cpu_is_omap34xx())
	ports = 3;
	else if (cpu_is_omap44xx())
	ports = 4;

	return ports;
	}

	/* Shared between omap2 and 3 */
	static resource_size_t omap2_i2c_irq[3] __initdata = {
	INT_24XX_I2C1_IRQ,
	INT_24XX_I2C2_IRQ,
	INT_34XX_I2C3_IRQ,
	};

	static resource_size_t omap4_i2c_irq[4] __initdata = {
	OMAP44XX_IRQ_I2C1,
	OMAP44XX_IRQ_I2C2,
	OMAP44XX_IRQ_I2C3,
	OMAP44XX_IRQ_I2C4,
	};

	static inline int omap1_i2c_add_bus(struct platform_device *pdev, int bus_id)
	{
	struct omap_i2c_bus_platform_data *pd;
	struct resource *res;

	pd = pdev->dev.platform_data;
	res = pdev->resource;
	res[0].start = OMAP1_I2C_BASE;
	res[0].end = res[0].start + OMAP_I2C_SIZE;
	res[1].start = INT_I2C;
	omap1_i2c_mux_pins(bus_id);

	return platform_device_register(pdev);
	}

	/*
	* XXX This function is a temporary compatibility wrapper - only
	* needed until the I2C driver can be converted to call
	* omap_pm_set_max_dev_wakeup_lat() and handle a return code.
	*/
	static void omap_pm_set_max_mpu_wakeup_lat_compat(struct device *dev, long t)
	{
	omap_pm_set_max_mpu_wakeup_lat(dev, t);
	}

	static inline int omap2_i2c_add_bus(struct platform_device *pdev, int bus_id)
	{
	struct resource *res;
	resource_size_t *irq;

	res = pdev->resource;

	if (!cpu_is_omap44xx())
	irq = omap2_i2c_irq;
	else
	irq = omap4_i2c_irq;

	if (bus_id == 1) {
	res[0].start = OMAP2_I2C_BASE1;
	res[0].end = res[0].start + OMAP_I2C_SIZE;
	}

	res[1].start = irq[bus_id - 1];
	omap2_i2c_mux_pins(bus_id);

	/*
	* When waiting for completion of a i2c transfer, we need to
	* set a wake up latency constraint for the MPU. This is to
	* ensure quick enough wakeup from idle, when transfer
	* completes.
	*/
	if (cpu_is_omap34xx()) {
	struct omap_i2c_bus_platform_data *pd;

	pd = pdev->dev.platform_data;
	pd->set_mpu_wkup_lat = omap_pm_set_max_mpu_wakeup_lat_compat;
	}

	return platform_device_register(pdev);
	}

	static int __init omap_i2c_add_bus(int bus_id)
	{
	struct platform_device *pdev;

	pdev = &omap_i2c_devices[bus_id - 1];

	if (cpu_class_is_omap1())
	return omap1_i2c_add_bus(pdev, bus_id);
	else
	return omap2_i2c_add_bus(pdev, bus_id);
	}

	/**
	* omap_i2c_bus_setup - Process command line options for the I2C bus speed
	* @str: String of options
	*
	* This function allow to override the default I2C bus speed for given I2C
	* bus with a command line option.
	*
	* Format: i2c_bus=bus_id,clkrate (in kHz)
	*
	* Returns 1 on success, 0 otherwise.
	*/
	static int __init omap_i2c_bus_setup(char *str)
	{
	int ports;
	int ints[3];

	ports = omap_i2c_nr_ports();
	get_options(str, 3, ints);
	if (ints[0] < 2 \|\| ints[1] < 1 \|\| ints[1] > ports)
	return 0;
	i2c_pdata[ints[1] - 1].clkrate = ints[2];
	i2c_pdata[ints[1] - 1].clkrate \|= OMAP_I2C_CMDLINE_SETUP;

	return 1;
	}
	__setup("i2c_bus=", omap_i2c_bus_setup);

	/*
	* Register busses defined in command line but that are not registered with
	* omap_register_i2c_bus from board initialization code.
	*/
	static int __init omap_register_i2c_bus_cmdline(void)
	{
	int i, err = 0;

	for (i = 0; i < ARRAY_SIZE(i2c_pdata); i++)
	if (i2c_pdata[i].clkrate & OMAP_I2C_CMDLINE_SETUP) {
	i2c_pdata[i].clkrate &= ~OMAP_I2C_CMDLINE_SETUP;
	err = omap_i2c_add_bus(i + 1);
	if (err)
	goto out;
	}

	out:
	return err;
	}
	subsys_initcall(omap_register_i2c_bus_cmdline);

	/**
	* omap_register_i2c_bus - register I2C bus with device descriptors
	* @bus_id: bus id counting from number 1
	* @clkrate: clock rate of the bus in kHz
	* @info: pointer into I2C device descriptor table or NULL
	* @len: number of descriptors in the table
	*
	* Returns 0 on success or an error code.
	*/
	int __init omap_register_i2c_bus(int bus_id, u32 clkrate,
	struct i2c_board_info const *info,
	unsigned len)
	{
	int err;

	BUG_ON(bus_id < 1 \|\| bus_id > omap_i2c_nr_ports());

	if (info) {
	err = i2c_register_board_info(bus_id, info, len);
	if (err)
	return err;
	}

	if (!i2c_pdata[bus_id - 1].clkrate)
	i2c_pdata[bus_id - 1].clkrate = clkrate;

	i2c_pdata[bus_id - 1].clkrate &= ~OMAP_I2C_CMDLINE_SETUP;

	return omap_i2c_add_bus(bus_id);
	}