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/*
* Copyright (c) 2014 embedded brains GmbH. All rights reserved.
*
* embedded brains GmbH
* Dornierstr. 4
* 82178 Puchheim
* Germany
* <info@embedded-brains.de>
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#include <bsp.h>
#include <bsp/i2cdrv.h>
#include <assert.h>
#include <rtems/libio.h>
#include "i2cdrv-config.h"
typedef struct {
ALT_I2C_DEV_t i2c_dev;
rtems_id mutex;
} i2cdrv_entry;
i2cdrv_entry i2cdrv_table[CYCLONE_V_NO_I2C];
static ALT_I2C_DEV_t *get_device(i2cdrv_entry *e)
{
return &e->i2c_dev;
}
static rtems_status_code init_i2c_module(
i2cdrv_entry *e,
const i2cdrv_configuration *cfg
)
{
ALT_STATUS_CODE asc = ALT_E_SUCCESS;
ALT_I2C_CTLR_t controller = cfg->controller;
ALT_I2C_DEV_t *dev = get_device(e);
ALT_I2C_MASTER_CONFIG_t i2c_cfg = {
.addr_mode = ALT_I2C_ADDR_MODE_7_BIT,
.restart_enable = false,
};
asc = alt_i2c_init(controller, dev);
if ( asc != ALT_E_SUCCESS ) {
return RTEMS_IO_ERROR;
}
asc = alt_i2c_op_mode_set(dev, ALT_I2C_MODE_MASTER);
if ( asc != ALT_E_SUCCESS ) {
return RTEMS_IO_ERROR;
}
asc = alt_i2c_master_config_speed_set(dev, &i2c_cfg, cfg->speed);
if ( asc != ALT_E_SUCCESS ) {
return RTEMS_IO_ERROR;
}
asc = alt_i2c_master_config_set(dev, &i2c_cfg);
if ( asc != ALT_E_SUCCESS ) {
return RTEMS_IO_ERROR;
}
asc = alt_i2c_enable(dev);
if ( asc != ALT_E_SUCCESS ) {
return RTEMS_IO_ERROR;
}
return RTEMS_SUCCESSFUL;
}
rtems_device_driver i2cdrv_initialize(
rtems_device_major_number major,
rtems_device_minor_number minor,
void *arg
)
{
rtems_status_code sc = RTEMS_SUCCESSFUL;
for ( size_t i = 0; i < CYCLONE_V_NO_I2C; ++i ) {
i2cdrv_entry *e = &i2cdrv_table[i];
const i2cdrv_configuration *cfg = &i2cdrv_config[i];
sc = rtems_io_register_name(cfg->device_name, major, i);
assert(sc == RTEMS_SUCCESSFUL);
sc = rtems_semaphore_create(
rtems_build_name ('I', '2', 'C', '0' + i),
0,
RTEMS_BINARY_SEMAPHORE | RTEMS_PRIORITY | RTEMS_INHERIT_PRIORITY,
0,
&e->mutex
);
assert(sc == RTEMS_SUCCESSFUL);
sc = init_i2c_module(e, cfg);
if ( sc != RTEMS_SUCCESSFUL ) {
/* I2C is not usable at this point. Releasing the mutex would allow the
* usage which could lead to undefined behaviour. */
return sc;
}
sc = rtems_semaphore_release(e->mutex);
assert(sc == RTEMS_SUCCESSFUL);
}
return sc;
}
rtems_device_driver i2cdrv_open(
rtems_device_major_number major,
rtems_device_major_number minor,
void *arg
)
{
rtems_status_code sc = RTEMS_SUCCESSFUL;
i2cdrv_entry *e = &i2cdrv_table[minor];
sc = rtems_semaphore_obtain(e->mutex, RTEMS_WAIT, RTEMS_NO_TIMEOUT);
return sc;
}
rtems_device_driver i2cdrv_close(
rtems_device_major_number major,
rtems_device_major_number minor,
void *arg
)
{
rtems_status_code sc = RTEMS_SUCCESSFUL;
i2cdrv_entry *e = &i2cdrv_table[minor];
sc = rtems_semaphore_release(e->mutex);
return sc;
}
rtems_device_driver i2cdrv_read(
rtems_device_major_number major,
rtems_device_major_number minor,
void *arg
)
{
rtems_status_code sc = RTEMS_SUCCESSFUL;
i2cdrv_entry *e = &i2cdrv_table[minor];
rtems_libio_rw_args_t *rw = arg;
ALT_I2C_DEV_t *dev = get_device(e);
ALT_STATUS_CODE asc = ALT_E_SUCCESS;
asc = alt_i2c_master_receive(dev, rw->buffer, rw->count, true, true);
if ( asc == ALT_E_SUCCESS ) {
rw->bytes_moved = rw->count;
} else {
sc = RTEMS_IO_ERROR;
}
return sc;
}
rtems_device_driver i2cdrv_write(
rtems_device_major_number major,
rtems_device_minor_number minor,
void *arg
)
{
rtems_status_code sc = RTEMS_SUCCESSFUL;
i2cdrv_entry *e = &i2cdrv_table[minor];
rtems_libio_rw_args_t *rw = arg;
ALT_I2C_DEV_t *dev = get_device(e);
ALT_STATUS_CODE asc = ALT_E_SUCCESS;
asc = alt_i2c_master_transmit(dev, rw->buffer, rw->count, true, true);
if ( asc == ALT_E_SUCCESS ) {
rw->bytes_moved = rw->count;
} else {
sc = RTEMS_IO_ERROR;
}
return sc;
}
static rtems_status_code ioctl_set_slave_address(
i2cdrv_entry *e,
rtems_libio_ioctl_args_t *args
)
{
ALT_I2C_DEV_t *dev = get_device(e);
ALT_STATUS_CODE asc = ALT_E_SUCCESS;
uint32_t address = (uint32_t) args->buffer;
asc = alt_i2c_master_target_set(dev, address);
if ( asc != ALT_E_SUCCESS ) {
return RTEMS_IO_ERROR;
}
return RTEMS_SUCCESSFUL;
}
rtems_device_driver i2cdrv_ioctl(
rtems_device_major_number major,
rtems_device_minor_number minor,
void *arg
)
{
rtems_status_code sc = RTEMS_SUCCESSFUL;
i2cdrv_entry *e = &i2cdrv_table[minor];
rtems_libio_ioctl_args_t *args = arg;
switch (args->command) {
case I2C_IOC_SET_SLAVE_ADDRESS:
sc = ioctl_set_slave_address(e, args);
break;
default:
sc = RTEMS_INVALID_NUMBER;
break;
}
return sc;
}
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