michaelh/zephyr
1
0
Fork 0
Code Releases Activity

i2c: ksdk: Add shim driver

Browse source 
Add a shim layer around the ksdk I2C driver to adapt it to the Zephyr
I2C interface. Currently only supports master mode.

Jira: ZEP-717
Change-Id: I704b8c38e22e456bb9fa4325682b2a354a27a7ba
Signed-off-by: Maureen Helm <maureen.helm@nxp.com>
This commit is contained in:
Maureen Helm 2016-04-29 15:53:40 -05:00 • committed by Kumar Gala
commit e4067638b7
6 changed files with 307 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

33
arch/arm/soc/nxp_kinetis/k6x/Kconfig.defconfig.mk64f12
View file

@ -108,6 +108,39 @@ endif # GPIO_K64
endif # GPIO
if I2C
config I2C_KSDK
def_bool y
config I2C_0
def_bool y
if I2C_0
config I2C_0_DEFAULT_CFG
default 0x12
config I2C_0_IRQ_PRI
default 0
endif # I2C_0
config I2C_1
def_bool n
if I2C_1
config I2C_1_DEFAULT_CFG
default 0x12
config I2C_1_IRQ_PRI
default 0
endif # I2C_1
endif # I2C
if PINMUX
config PINMUX_K64

7
drivers/i2c/Kconfig
View file

@ -74,6 +74,13 @@ config I2C_ATMEL_SAM3
Says y to enable additional options to enable support
for individual controllers.
config I2C_KSDK
bool "KSDK I2C driver"
depends on I2C && HAS_KSDK
default n
help
Enable the ksdk I2C driver.
config I2C_INIT_PRIORITY
int
depends on I2C

1
drivers/i2c/Makefile
View file

@ -3,3 +3,4 @@ obj-$(CONFIG_I2C_QMSI) += i2c_qmsi.o
obj-$(CONFIG_I2C_QMSI_SS) += i2c_qmsi_ss.o
obj-$(CONFIG_I2C_QUARK_SE_SS) += i2c_quark_se_ss.o
obj-$(CONFIG_I2C_ATMEL_SAM3) += i2c_atmel_sam3.o
obj-$(CONFIG_I2C_KSDK) += i2c_ksdk.o

246
drivers/i2c/i2c_ksdk.c Normal file
View file

@ -0,0 +1,246 @@
/*
* Copyright (c) 2016 Freescale Semiconductor, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <errno.h>
#include <i2c.h>
#include <soc.h>
#include <fsl_i2c.h>
#include <fsl_clock.h>
#include <misc/util.h>
#define DEV_CFG(dev) \
((struct i2c_ksdk_config * const)(dev)->config->config_info)
#define DEV_DATA(dev) \
((struct i2c_ksdk_data * const)(dev)->driver_data)
#define DEV_BASE(dev) \
((I2C_Type *)(DEV_CFG(dev))->base)
struct i2c_ksdk_config {
I2C_Type *base;
clock_name_t clock_source;
void (*irq_config_func)(struct device *dev);
union dev_config default_cfg;
};
struct i2c_ksdk_data {
i2c_master_handle_t handle;
device_sync_call_t sync;
status_t callback_status;
};
static int i2c_ksdk_configure(struct device *dev, uint32_t dev_config_raw)
{
I2C_Type *base = DEV_BASE(dev);
struct i2c_ksdk_config *config = DEV_CFG(dev);
union dev_config dev_config = (union dev_config)dev_config_raw;
uint32_t clock_freq;
uint32_t baudrate;
if (!dev_config.bits.is_master_device) {
return -EINVAL;
}
if (dev_config.bits.is_slave_read) {
return -EINVAL;
}
if (dev_config.bits.use_10_bit_addr) {
return -EINVAL;
}
switch (dev_config.bits.speed) {
case I2C_SPEED_STANDARD:
baudrate = KHZ(100);
break;
case I2C_SPEED_FAST:
baudrate = MHZ(1);
break;
default:
return -EINVAL;
}
clock_freq = CLOCK_GetFreq(config->clock_source);
I2C_MasterSetBaudRate(base, baudrate, clock_freq);
return 0;
}
static void i2c_ksdk_master_transfer_callback(I2C_Type *base,
i2c_master_handle_t *handle, status_t status, void *userData)
{
struct device *dev = userData;
struct i2c_ksdk_data *data = DEV_DATA(dev);
data->callback_status = status;
device_sync_call_complete(&data->sync);
}
static uint32_t i2c_ksdk_convert_flags(int msg_flags)
{
uint32_t flags = 0;
if (!(msg_flags & I2C_MSG_STOP)) {
flags |= kI2C_TransferNoStopFlag;
}
if (msg_flags & I2C_MSG_RESTART) {
flags |= kI2C_TransferRepeatedStartFlag;
}
return flags;
}
static int i2c_ksdk_transfer(struct device *dev, struct i2c_msg *msgs,
uint8_t num_msgs, uint16_t addr)
{
I2C_Type *base = DEV_BASE(dev);
struct i2c_ksdk_data *data = DEV_DATA(dev);
i2c_master_transfer_t transfer;
status_t status;
/* Iterate over all the messages */
for (int i = 0; i < num_msgs; i++) {
/* Initialize the transfer descriptor */
transfer.flags = i2c_ksdk_convert_flags(msgs->flags);
transfer.slaveAddress = addr;
transfer.direction = (msgs->flags & I2C_MSG_READ)
? kI2C_Read : kI2C_Write;
transfer.subaddress = 0;
transfer.subaddressSize = 0;
transfer.data = msgs->buf;
transfer.dataSize = msgs->len;
/* Start the transfer */
status = I2C_MasterTransferNonBlocking(base,
&data->handle, &transfer);
/* Return an error if the transfer didn't start successfully
* e.g., if the bus was busy
*/
if (status != kStatus_Success) {
return -EIO;
}
/* Wait for the transfer to complete */
device_sync_call_wait(&data->sync);
/* Return an error if the transfer didn't complete
* successfully. e.g., nak, timeout, lost arbitration
*/
if (data->callback_status != kStatus_Success) {
return -EIO;
}
/* Move to the next message */
msgs++;
}
return 0;
}
static void i2c_ksdk_isr(void *arg)
{
struct device *dev = (struct device *)arg;
I2C_Type *base = DEV_BASE(dev);
struct i2c_ksdk_data *data = DEV_DATA(dev);
I2C_MasterTransferHandleIRQ(base, &data->handle);
}
static int i2c_ksdk_init(struct device *dev)
{
I2C_Type *base = DEV_BASE(dev);
struct i2c_ksdk_config *config = DEV_CFG(dev);
struct i2c_ksdk_data *data = DEV_DATA(dev);
uint32_t clock_freq;
i2c_master_config_t master_config;
int error;
device_sync_call_init(&data->sync);
clock_freq = CLOCK_GetFreq(config->clock_source);
I2C_MasterGetDefaultConfig(&master_config);
I2C_MasterInit(base, &master_config, clock_freq);
I2C_MasterTransferCreateHandle(base, &data->handle,
i2c_ksdk_master_transfer_callback, dev);
error = i2c_ksdk_configure(dev, config->default_cfg.raw);
if (error) {
return error;
}
config->irq_config_func(dev);
return 0;
}
static struct i2c_driver_api i2c_ksdk_driver_api = {
.configure = i2c_ksdk_configure,
.transfer = i2c_ksdk_transfer,
};
#ifdef CONFIG_I2C_0
static void i2c_ksdk_config_func_0(struct device *dev);
static struct i2c_ksdk_config i2c_ksdk_config_0 = {
.base = I2C0,
.clock_source = I2C0_CLK_SRC,
.irq_config_func = i2c_ksdk_config_func_0,
.default_cfg.raw = CONFIG_I2C_0_DEFAULT_CFG,
};
static struct i2c_ksdk_data i2c_ksdk_data_0;
DEVICE_AND_API_INIT(i2c_ksdk_0, CONFIG_I2C_0_NAME, &i2c_ksdk_init,
&i2c_ksdk_data_0, &i2c_ksdk_config_0,
SECONDARY, CONFIG_KERNEL_INIT_PRIORITY_DEVICE,
&i2c_ksdk_driver_api);
static void i2c_ksdk_config_func_0(struct device *dev)
{
IRQ_CONNECT(IRQ_I2C0, CONFIG_I2C_0_IRQ_PRI,
i2c_ksdk_isr, DEVICE_GET(i2c_ksdk_0), 0);
irq_enable(I2C0_IRQn);
}
#endif /* CONFIG_I2C_0 */
#ifdef CONFIG_I2C_1
static void i2c_ksdk_config_func_1(struct device *dev);
static struct i2c_ksdk_config i2c_ksdk_config_1 = {
.base = I2C1,
.clock_source = I2C1_CLK_SRC,
.irq_config_func = i2c_ksdk_config_func_1,
.default_cfg.raw = CONFIG_I2C_1_DEFAULT_CFG,
};
static struct i2c_ksdk_data i2c_ksdk_data_1;
DEVICE_AND_API_INIT(i2c_ksdk_1, CONFIG_I2C_1_NAME, &i2c_ksdk_init,
&i2c_ksdk_data_1, &i2c_ksdk_config_1,
SECONDARY, CONFIG_KERNEL_INIT_PRIORITY_DEVICE,
&i2c_ksdk_driver_api);
static void i2c_ksdk_config_func_1(struct device *dev)
{
IRQ_CONNECT(IRQ_I2C1, CONFIG_I2C_1_IRQ_PRI,
i2c_ksdk_isr, DEVICE_GET(i2c_ksdk_1), 0);
irq_enable(I2C1_IRQn);
}
#endif /* CONFIG_I2C_1 */

3
ext/hal/ksdk/Makefile
View file

@ -35,4 +35,7 @@ KBUILD_CFLAGS += -D$(KSDK_CPU)
# for every ksdk device.
obj-y += devices/$(KSDK_DEVICE)/fsl_clock.o
# Build ksdk drivers that can be used for multiple SoC's.
obj-y += drivers/
endif

17
ext/hal/ksdk/drivers/Makefile Normal file
View file

@ -0,0 +1,17 @@
# Makefile - Kinetis SDK drivers
#
# Copyright (c) 2016, Freescale Semiconductor, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
obj-$(CONFIG_I2C_KSDK) += fsl_i2c.o