27fac88548
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@17254 a1c6a512-1295-4272-9138-f99709370657
76 lines
2.5 KiB
C
76 lines
2.5 KiB
C
/***************************************************************************
|
|
* __________ __ ___.
|
|
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
|
|
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
|
|
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
|
|
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
|
|
* \/ \/ \/ \/ \/
|
|
* $Id$
|
|
*
|
|
* Copyright (C) 2007 by Michael Sevakis
|
|
*
|
|
* All files in this archive are subject to the GNU General Public License.
|
|
* See the file COPYING in the source tree root for full license agreement.
|
|
*
|
|
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
|
|
* KIND, either express or implied.
|
|
*
|
|
****************************************************************************/
|
|
#ifndef _I2C_IMX31_H_
|
|
#define _I2C_IMX31_H_
|
|
|
|
#include <stdbool.h>
|
|
|
|
/* I2C module usage masks */
|
|
#define USE_I2C1_MODULE (1 << 0)
|
|
#define USE_I2C2_MODULE (1 << 1)
|
|
#define USE_I2C3_MODULE (1 << 2)
|
|
|
|
enum i2c_module_number
|
|
{
|
|
__I2C_NUM_START = -1,
|
|
#if (I2C_MODULE_MASK & USE_I2C1_MODULE)
|
|
I2C1_NUM,
|
|
#endif
|
|
#if (I2C_MODULE_MASK & USE_I2C2_MODULE)
|
|
I2C2_NUM,
|
|
#endif
|
|
#if (I2C_MODULE_MASK & USE_I2C3_MODULE)
|
|
I2C3_NUM,
|
|
#endif
|
|
I2C_NUM_I2C,
|
|
};
|
|
|
|
/* Module interface map structure */
|
|
struct i2c_map
|
|
{
|
|
volatile uint16_t iadr; /* 0x00 */
|
|
volatile uint16_t unused1;
|
|
volatile uint16_t ifdr; /* 0x04 */
|
|
volatile uint16_t unused2;
|
|
volatile uint16_t i2cr; /* 0x08 */
|
|
volatile uint16_t unused3;
|
|
volatile uint16_t i2sr; /* 0x0C */
|
|
volatile uint16_t unused4;
|
|
volatile uint16_t i2dr; /* 0x10 */
|
|
};
|
|
|
|
struct i2c_node
|
|
{
|
|
enum i2c_module_number num; /* Module that this node uses */
|
|
unsigned int ifdr; /* Maximum frequency for node */
|
|
unsigned char addr; /* Slave address on module */
|
|
};
|
|
|
|
void i2c_init(void);
|
|
/* Enable or disable the node - modules will be switch on/off accordingly. */
|
|
void i2c_enable_node(struct i2c_node *node, bool enable);
|
|
/* If addr < 0, then raw read */
|
|
int i2c_read(struct i2c_node *node, int addr, unsigned char *data, int count);
|
|
int i2c_write(struct i2c_node *node, const unsigned char *data, int count);
|
|
/* Gain mutually-exclusive access to the node and module to perform multiple
|
|
* operations atomically */
|
|
void i2c_lock_node(struct i2c_node *node);
|
|
void i2c_unlock_node(struct i2c_node *node);
|
|
|
|
#endif /* _I2C_IMX31_H_ */
|