Subversion Repositories openrisc

/*************************************************************

 * I2C functions for Herveille i2c master_slave core         *

 *                                                           *

 * Provides functions to read from and write to the I2C bus. *

 * Master and slave mode are both supported                  *

 *                                                           *

 *                                                           *

 ************************************************************/

#ifndef _I2C_MASTER_SLAVE_H_

#define _I2C_MASTER_SLAVE_H_

extern const int i2c_base_adr[4];

//Memory mapping adresses

#define I2C_MASTER_SLAVE_PRERlo 0x0     // Clock prescaler register

#define I2C_MASTER_SLAVE_PRERhi 0x1     // Clock prescaler register

#define I2C_MASTER_SLAVE_CTR    0x2     // Control register

#define I2C_MASTER_SLAVE_TXR    0x3     // Transmit register

#define I2C_MASTER_SLAVE_RXR    0x3     // Recive register

#define I2C_MASTER_SLAVE_CR     0x4     // Control register

#define I2C_MASTER_SLAVE_SR     0x4     // Status register

#define I2C_MASTER_SLAVE_SLADR  0x7     // Slave address register

#define I2C_MASTER_SLAVE_CTR_CORE_ENABLE 0x80

#define I2C_MASTER_SLAVE_CTR_INTR_ENABLE 0x40

#define I2C_MASTER_SLAVE_CTR_SLAVE_ENABLE 0x20

#define I2C_MASTER_SLAVE_CR_START        0x80

#define I2C_MASTER_SLAVE_CR_STOP         0x40

#define I2C_MASTER_SLAVE_CR_READ         0x20

#define I2C_MASTER_SLAVE_CR_WRITE        0x10

#define I2C_MASTER_SLAVE_CR_ACK          0x08

#define I2C_MASTER_SLAVE_CR_SL_CONT      0x02

#define I2C_MASTER_SLAVE_CR_IACK         0x01

#define I2C_MASTER_SLAVE_SR_RXACK            0x80

#define I2C_MASTER_SLAVE_SR_BUSY             0x40

#define I2C_MASTER_SLAVE_SR_ARB_LOST         0x20

#define I2C_MASTER_SLAVE_SR_SLAVE_MODE       0x10

#define I2C_MASTER_SLAVE_SR_SLAVE_DATA_AVAIL 0x08

#define I2C_MASTER_SLAVE_SR_SLAVE_DATA_REQ   0x04

#define I2C_MASTER_SLAVE_SR_TRANSFER_IN_PRG  0x02

#define I2C_MASTER_SLAVE_SR_IRQ_FLAG         0x01

int i2c_master_slave_init_core(int core, unsigned short prescaler,

                               int interrupt_enable);

int i2c_master_slave_deact_core(int core);

int i2c_master_slave_init_as_slave(int core, char addr);

int i2c_master_slave_deact_as_slave(int core);

int i2c_master_slave_master_start(int core, unsigned char addr, int read);

int i2c_master_slave_master_write(int core, unsigned char data,

                                  int check_prev_ack, int stop);

int i2c_master_slave_master_stop(int core);

int i2c_master_slave_master_read(int core, int check_prev_ack, int stop,

                                 char *data);

int i2c_master_slave_ack_interrupt(int core);

#endif