95d76f2da2
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@17536 a1c6a512-1295-4272-9138-f99709370657
76 lines
2.4 KiB
C
76 lines
2.4 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2007 by Michael Sevakis
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#ifndef I2C_IMX31_H
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#define I2C_IMX31_H
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#include <stdbool.h>
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/* I2C module usage masks */
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#define USE_I2C1_MODULE (1 << 0)
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#define USE_I2C2_MODULE (1 << 1)
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#define USE_I2C3_MODULE (1 << 2)
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enum i2c_module_number
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{
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__I2C_NUM_START = -1,
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#if (I2C_MODULE_MASK & USE_I2C1_MODULE)
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I2C1_NUM,
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#endif
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#if (I2C_MODULE_MASK & USE_I2C2_MODULE)
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I2C2_NUM,
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#endif
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#if (I2C_MODULE_MASK & USE_I2C3_MODULE)
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I2C3_NUM,
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#endif
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I2C_NUM_I2C,
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};
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/* Module interface map structure */
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struct i2c_map
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{
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volatile uint16_t iadr; /* 0x00 */
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volatile uint16_t unused1;
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volatile uint16_t ifdr; /* 0x04 */
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volatile uint16_t unused2;
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volatile uint16_t i2cr; /* 0x08 */
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volatile uint16_t unused3;
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volatile uint16_t i2sr; /* 0x0C */
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volatile uint16_t unused4;
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volatile uint16_t i2dr; /* 0x10 */
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};
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struct i2c_node
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{
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enum i2c_module_number num; /* Module that this node uses */
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unsigned int ifdr; /* Maximum frequency for node */
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unsigned char addr; /* Slave address on module */
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};
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void i2c_init(void);
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/* Enable or disable the node - modules will be switch on/off accordingly. */
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void i2c_enable_node(struct i2c_node *node, bool enable);
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/* If addr < 0, then raw read */
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int i2c_read(struct i2c_node *node, int addr, unsigned char *data, int count);
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int i2c_write(struct i2c_node *node, const unsigned char *data, int count);
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/* Gain mutually-exclusive access to the node and module to perform multiple
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* operations atomically */
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void i2c_lock_node(struct i2c_node *node);
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void i2c_unlock_node(struct i2c_node *node);
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#endif /* I2C_IMX31_H */
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