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zephyr/drivers/i2c/i2c_rv32m1_lpi2c.c
Tomasz Bursztyka 206f4d61fc drivers: i2c: Fix device instance const qualifier loss 
In all of these drivers, passing the device's data was sufficient as
only the data is being used by the HAL callback function then.

Fixes #27399

Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>
2020-09-02 13:48:13 +02:00

301 lines
8.6 KiB
C
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/*
* Copyright (c) 2019, Henrik Brix Andersen <henrik@brixandersen.dk>
*
* Based on the i2c_mcux_lpi2c.c driver, which is:
* Copyright (c) 2016 Freescale Semiconductor, Inc.
* Copyright (c) 2019, NXP
*
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT openisa_rv32m1_lpi2c
#include <drivers/i2c.h>
#include <drivers/clock_control.h>
#include <fsl_lpi2c.h>
#include <logging/log.h>
LOG_MODULE_REGISTER(rv32m1_lpi2c);
#include "i2c-priv.h"
struct rv32m1_lpi2c_config {
LPI2C_Type *base;
char *clock_controller;
clock_control_subsys_t clock_subsys;
clock_ip_name_t clock_ip_name;
uint32_t clock_ip_src;
uint32_t bitrate;
void (*irq_config_func)(const struct device *dev);
};
struct rv32m1_lpi2c_data {
lpi2c_master_handle_t handle;
struct k_sem transfer_sync;
struct k_sem completion_sync;
status_t completion_status;
};
static int rv32m1_lpi2c_configure(const struct device *dev,
uint32_t dev_config)
{
const struct rv32m1_lpi2c_config *config = dev->config;
const struct device *clk;
uint32_t baudrate;
uint32_t clk_freq;
int err;
if (!(I2C_MODE_MASTER & dev_config)) {
/* Slave mode not supported - yet */
LOG_ERR("Slave mode not supported");
return -ENOTSUP;
}
if (I2C_ADDR_10_BITS & dev_config) {
/* FSL LPI2C driver only supports 7-bit addressing */
LOG_ERR("10 bit addressing not supported");
return -ENOTSUP;
}
switch (I2C_SPEED_GET(dev_config)) {
case I2C_SPEED_STANDARD:
baudrate = KHZ(100);
break;
case I2C_SPEED_FAST:
baudrate = KHZ(400);
break;
case I2C_SPEED_FAST_PLUS:
baudrate = MHZ(1);
break;
/* TODO: only if SCL pin implements current source pull-up */
/* case I2C_SPEED_HIGH: */
/* baudrate = KHZ(3400); */
/* break; */
/* TODO: ultra-fast requires pin_config setting */
/* case I2C_SPEED_ULTRA: */
/* baudrate = MHZ(5); */
/* break; */
default:
LOG_ERR("Unsupported speed");
return -ENOTSUP;
}
clk = device_get_binding(config->clock_controller);
if (!clk) {
LOG_ERR("Could not get clock controller '%s'",
config->clock_controller);
return -EINVAL;
}
err = clock_control_get_rate(clk, config->clock_subsys, &clk_freq);
if (err) {
LOG_ERR("Could not get clock frequency (err %d)", err);
return -EINVAL;
}
LPI2C_MasterSetBaudRate(config->base, clk_freq, baudrate);
return 0;
}
static void rv32m1_lpi2c_master_transfer_callback(LPI2C_Type *base,
lpi2c_master_handle_t *handle,
status_t completionStatus,
void *userData)
{
struct rv32m1_lpi2c_data *data = userData;
ARG_UNUSED(base);
ARG_UNUSED(handle);
data->completion_status = completionStatus;
k_sem_give(&data->completion_sync);
}
static uint32_t rv32m1_lpi2c_convert_flags(int msg_flags)
{
uint32_t flags = 0U;
if (!(msg_flags & I2C_MSG_STOP)) {
flags |= kLPI2C_TransferNoStopFlag;
}
if (msg_flags & I2C_MSG_RESTART) {
flags |= kLPI2C_TransferRepeatedStartFlag;
}
return flags;
}
static int rv32m1_lpi2c_transfer(const struct device *dev,
struct i2c_msg *msgs,
uint8_t num_msgs, uint16_t addr)
{
const struct rv32m1_lpi2c_config *config = dev->config;
struct rv32m1_lpi2c_data *data = dev->data;
lpi2c_master_transfer_t transfer;
status_t status;
int ret = 0;
k_sem_take(&data->transfer_sync, K_FOREVER);
/* Iterate over all the messages */
for (int i = 0; i < num_msgs; i++) {
if (I2C_MSG_ADDR_10_BITS & msgs->flags) {
ret = -ENOTSUP;
goto out;
}
/* Initialize the transfer descriptor */
transfer.flags = rv32m1_lpi2c_convert_flags(msgs->flags);
/* Prevent the controller to send a start condition between
* messages, except if explicitly requested.
*/
if (i != 0 && !(msgs->flags & I2C_MSG_RESTART)) {
transfer.flags |= kLPI2C_TransferNoStartFlag;
}
transfer.slaveAddress = addr;
transfer.direction = (msgs->flags & I2C_MSG_READ)
? kLPI2C_Read : kLPI2C_Write;
transfer.subaddress = 0;
transfer.subaddressSize = 0;
transfer.data = msgs->buf;
transfer.dataSize = msgs->len;
/* Start the transfer */
status = LPI2C_MasterTransferNonBlocking(config->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) {
LOG_DBG("Could not start transfer (status %d)", status);
ret = -EIO;
goto out;
}
/* Wait for the transfer to complete */
k_sem_take(&data->completion_sync, K_FOREVER);
/* Return an error if the transfer didn't complete
* successfully. e.g., nak, timeout, lost arbitration
*/
if (data->completion_status != kStatus_Success) {
LOG_DBG("Transfer failed (status %d)",
data->completion_status);
LPI2C_MasterTransferAbort(config->base, &data->handle);
ret = -EIO;
goto out;
}
/* Move to the next message */
msgs++;
}
out:
k_sem_give(&data->transfer_sync);
return ret;
}
static void rv32m1_lpi2c_isr(void *arg)
{
const struct device *dev = (const struct device *)arg;
const struct rv32m1_lpi2c_config *config = dev->config;
struct rv32m1_lpi2c_data *data = dev->data;
LPI2C_MasterTransferHandleIRQ(config->base, &data->handle);
}
static int rv32m1_lpi2c_init(const struct device *dev)
{
const struct rv32m1_lpi2c_config *config = dev->config;
struct rv32m1_lpi2c_data *data = dev->data;
lpi2c_master_config_t master_config;
const struct device *clk;
uint32_t clk_freq, dev_cfg;
int err;
CLOCK_SetIpSrc(config->clock_ip_name, config->clock_ip_src);
clk = device_get_binding(config->clock_controller);
if (!clk) {
LOG_ERR("Could not get clock controller '%s'",
config->clock_controller);
return -EINVAL;
}
err = clock_control_on(clk, config->clock_subsys);
if (err) {
LOG_ERR("Could not turn on clock (err %d)", err);
return -EINVAL;
}
err = clock_control_get_rate(clk, config->clock_subsys, &clk_freq);
if (err) {
LOG_ERR("Could not get clock frequency (err %d)", err);
return -EINVAL;
}
LPI2C_MasterGetDefaultConfig(&master_config);
LPI2C_MasterInit(config->base, &master_config, clk_freq);
LPI2C_MasterTransferCreateHandle(config->base, &data->handle,
rv32m1_lpi2c_master_transfer_callback,
data);
dev_cfg = i2c_map_dt_bitrate(config->bitrate);
err = rv32m1_lpi2c_configure(dev, dev_cfg | I2C_MODE_MASTER);
if (err) {
LOG_ERR("Could not configure controller (err %d)", err);
return err;
}
config->irq_config_func(dev);
return 0;
}
static const struct i2c_driver_api rv32m1_lpi2c_driver_api = {
.configure = rv32m1_lpi2c_configure,
.transfer = rv32m1_lpi2c_transfer,
};
#define RV32M1_LPI2C_DEVICE(id) \
static void rv32m1_lpi2c_irq_config_func_##id(struct device *dev); \
static const struct rv32m1_lpi2c_config rv32m1_lpi2c_##id##_config = { \
.base = \
(LPI2C_Type *)DT_INST_REG_ADDR(id), \
.clock_controller = DT_INST_CLOCKS_LABEL(id), \
.clock_subsys = \
(clock_control_subsys_t) DT_INST_CLOCKS_CELL(id, name),\
.clock_ip_name = INST_DT_CLOCK_IP_NAME(id), \
.clock_ip_src = kCLOCK_IpSrcFircAsync, \
.bitrate = DT_INST_PROP(id, clock_frequency), \
.irq_config_func = rv32m1_lpi2c_irq_config_func_##id, \
}; \
static struct rv32m1_lpi2c_data rv32m1_lpi2c_##id##_data = { \
.transfer_sync = Z_SEM_INITIALIZER( \
rv32m1_lpi2c_##id##_data.transfer_sync, 1, 1), \
.completion_sync = Z_SEM_INITIALIZER( \
rv32m1_lpi2c_##id##_data.completion_sync, 0, 1), \
}; \
DEVICE_AND_API_INIT(rv32m1_lpi2c_##id, \
DT_INST_LABEL(id), \
&rv32m1_lpi2c_init, \
&rv32m1_lpi2c_##id##_data, \
&rv32m1_lpi2c_##id##_config, \
POST_KERNEL, CONFIG_I2C_INIT_PRIORITY, \
&rv32m1_lpi2c_driver_api); \
static void rv32m1_lpi2c_irq_config_func_##id(struct device *dev) \
{ \
IRQ_CONNECT(DT_INST_IRQN(id), \
0, \
rv32m1_lpi2c_isr, DEVICE_GET(rv32m1_lpi2c_##id), \
0); \
irq_enable(DT_INST_IRQN(id)); \
} \
DT_INST_FOREACH_STATUS_OKAY(RV32M1_LPI2C_DEVICE)
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