/*
* Copyright (c) 2016 Intel Corporation.
*
* 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 <device.h>
#include <i2c.h>
#include <ioapic.h>
#include <power.h>
#include "qm_i2c.h"
#include "qm_isr.h"
#include "clk.h"
/* Convenient macros to get the controller instance and the driver data. */
#define GET_CONTROLLER_INSTANCE(dev) \
(((const struct i2c_qmsi_config_info *) \
dev->config->config_info)->instance)
#define GET_DRIVER_DATA(dev) \
((struct i2c_qmsi_driver_data *)dev->driver_data)
struct i2c_qmsi_config_info {
qm_i2c_t instance; /* Controller instance. */
union dev_config default_cfg;
clk_periph_t clock_gate;
};
static int i2c_qmsi_init(struct device *dev);
struct i2c_qmsi_driver_data {
device_sync_call_t sync;
int transfer_status;
struct k_sem sem;
#ifdef CONFIG_DEVICE_POWER_MANAGEMENT
uint32_t device_power_state;
#ifdef CONFIG_SYS_POWER_DEEP_SLEEP
qm_i2c_context_t i2c_ctx;
#endif
#endif
};
#ifdef CONFIG_DEVICE_POWER_MANAGEMENT
static void i2c_qmsi_set_power_state(struct device *dev, uint32_t power_state)
{
struct i2c_qmsi_driver_data *drv_data = dev->driver_data;
drv_data->device_power_state = power_state;
}
static uint32_t i2c_qmsi_get_power_state(struct device *dev)
{
struct i2c_qmsi_driver_data *drv_data = dev->driver_data;
return drv_data->device_power_state;
}
#ifdef CONFIG_SYS_POWER_DEEP_SLEEP
static int i2c_suspend_device(struct device *dev)
{
if (device_busy_check(dev)) {
return -EBUSY;
}
struct i2c_qmsi_driver_data *drv_data = GET_DRIVER_DATA(dev);
qm_i2c_save_context(GET_CONTROLLER_INSTANCE(dev), &drv_data->i2c_ctx);
i2c_qmsi_set_power_state(dev, DEVICE_PM_SUSPEND_STATE);
return 0;
}
static int i2c_resume_device_from_suspend(struct device *dev)
{
struct i2c_qmsi_driver_data *drv_data = GET_DRIVER_DATA(dev);
qm_i2c_restore_context(GET_CONTROLLER_INSTANCE(dev),
&drv_data->i2c_ctx);
i2c_qmsi_set_power_state(dev, DEVICE_PM_ACTIVE_STATE);
return 0;
}
#endif
/*
* Implements the driver control management functionality
* the *context may include IN data or/and OUT data
*/
static int i2c_device_ctrl(struct device *dev, uint32_t ctrl_command,
void *context)
{
if (ctrl_command == DEVICE_PM_SET_POWER_STATE) {
#ifdef CONFIG_SYS_POWER_DEEP_SLEEP
if (*((uint32_t *)context) == DEVICE_PM_SUSPEND_STATE) {
return i2c_suspend_device(dev);
} else if (*((uint32_t *)context) == DEVICE_PM_ACTIVE_STATE) {
return i2c_resume_device_from_suspend(dev);
}
#endif
} else if (ctrl_command == DEVICE_PM_GET_POWER_STATE) {
*((uint32_t *)context) = i2c_qmsi_get_power_state(dev);
return 0;
}
return 0;
}
#else
#define i2c_qmsi_set_power_state(...)
#endif /* CONFIG_DEVICE_POWER_MANAGEMENT */
#ifdef CONFIG_I2C_0
static struct i2c_qmsi_driver_data driver_data_0;
static const struct i2c_qmsi_config_info config_info_0 = {
.instance = QM_I2C_0,
.default_cfg.raw = CONFIG_I2C_0_DEFAULT_CFG,
.clock_gate = CLK_PERIPH_I2C_M0_REGISTER | CLK_PERIPH_CLK,
};
DEVICE_DEFINE(i2c_0, CONFIG_I2C_0_NAME, &i2c_qmsi_init,
i2c_device_ctrl, &driver_data_0, &config_info_0, POST_KERNEL,
CONFIG_KERNEL_INIT_PRIORITY_DEVICE, NULL);
#endif /* CONFIG_I2C_0 */
#ifdef CONFIG_I2C_1
static struct i2c_qmsi_driver_data driver_data_1;
static const struct i2c_qmsi_config_info config_info_1 = {
.instance = QM_I2C_1,
.default_cfg.raw = CONFIG_I2C_1_DEFAULT_CFG,
.clock_gate = CLK_PERIPH_I2C_M1_REGISTER | CLK_PERIPH_CLK,
};
DEVICE_DEFINE(i2c_1, CONFIG_I2C_1_NAME, &i2c_qmsi_init,
i2c_device_ctrl, &driver_data_1, &config_info_1, POST_KERNEL,
CONFIG_KERNEL_INIT_PRIORITY_DEVICE, NULL);
#endif /* CONFIG_I2C_1 */
static int i2c_qmsi_configure(struct device *dev, uint32_t config)
{
qm_i2c_t instance = GET_CONTROLLER_INSTANCE(dev);
struct i2c_qmsi_driver_data *driver_data = GET_DRIVER_DATA(dev);
qm_i2c_reg_t *const controller = QM_I2C[instance];
union dev_config cfg;
int rc;
qm_i2c_config_t qm_cfg;
cfg.raw = config;
/* This driver only supports master mode. */
if (!cfg.bits.is_master_device)
return -EINVAL;
qm_cfg.mode = QM_I2C_MASTER;
qm_cfg.address_mode = (cfg.bits.use_10_bit_addr) ? QM_I2C_10_BIT :
QM_I2C_7_BIT;
switch (cfg.bits.speed) {
case I2C_SPEED_STANDARD:
qm_cfg.speed = QM_I2C_SPEED_STD;
break;
case I2C_SPEED_FAST:
qm_cfg.speed = QM_I2C_SPEED_FAST;
break;
case I2C_SPEED_FAST_PLUS:
qm_cfg.speed = QM_I2C_SPEED_FAST_PLUS;
break;
default:
return -EINVAL;
}
k_sem_take(&driver_data->sem, K_FOREVER);
rc = qm_i2c_set_config(instance, &qm_cfg);
k_sem_give(&driver_data->sem);
controller->ic_sda_hold = (CONFIG_I2C_SDA_RX_HOLD << 16) +
CONFIG_I2C_SDA_TX_HOLD;
controller->ic_sda_setup = CONFIG_I2C_SDA_SETUP;
return rc;
}
static void transfer_complete(void *data, int rc, qm_i2c_status_t status,
uint32_t len)
{
struct device *dev = (struct device *) data;
struct i2c_qmsi_driver_data *driver_data;
driver_data = GET_DRIVER_DATA(dev);
driver_data->transfer_status = rc;
device_sync_call_complete(&driver_data->sync);
}
static int i2c_qmsi_transfer(struct device *dev, struct i2c_msg *msgs,
uint8_t num_msgs, uint16_t addr)
{
struct i2c_qmsi_driver_data *driver_data = GET_DRIVER_DATA(dev);
qm_i2c_t instance = GET_CONTROLLER_INSTANCE(dev);
int rc;
if (msgs == NULL || num_msgs == 0) {
return -ENOTSUP;
}
device_busy_set(dev);
for (int i = 0; i < num_msgs; i++) {
uint8_t op = msgs[i].flags & I2C_MSG_RW_MASK;
bool stop = (msgs[i].flags & I2C_MSG_STOP) == I2C_MSG_STOP;
qm_i2c_transfer_t xfer = { 0 };
if (op == I2C_MSG_WRITE) {
xfer.tx = msgs[i].buf;
xfer.tx_len = msgs[i].len;
} else {
xfer.rx = msgs[i].buf;
xfer.rx_len = msgs[i].len;
}
xfer.callback = transfer_complete;
xfer.callback_data = dev;
xfer.stop = stop;
k_sem_take(&driver_data->sem, K_FOREVER);
rc = qm_i2c_master_irq_transfer(instance, &xfer, addr);
k_sem_give(&driver_data->sem);
if (rc != 0) {
device_busy_clear(dev);
return -EIO;
}
/* Block current thread until the I2C transfer completes. */
device_sync_call_wait(&driver_data->sync);
if (driver_data->transfer_status != 0) {
device_busy_clear(dev);
return -EIO;
}
}
device_busy_clear(dev);
return 0;
}
static const struct i2c_driver_api api = {
.configure = i2c_qmsi_configure,
.transfer = i2c_qmsi_transfer,
};
static int i2c_qmsi_init(struct device *dev)
{
struct i2c_qmsi_driver_data *driver_data = GET_DRIVER_DATA(dev);
const struct i2c_qmsi_config_info *config = dev->config->config_info;
qm_i2c_t instance = GET_CONTROLLER_INSTANCE(dev);
int err;
device_sync_call_init(&driver_data->sync);
k_sem_init(&driver_data->sem, 0, UINT_MAX);
k_sem_give(&driver_data->sem);
switch (instance) {
case QM_I2C_0:
/* Register interrupt handler, unmask IRQ and route it
* to Lakemont core.
*/
IRQ_CONNECT(QM_IRQ_I2C_0_INT,
CONFIG_I2C_0_IRQ_PRI, qm_i2c_0_irq_isr, NULL,
(IOAPIC_LEVEL | IOAPIC_HIGH));
irq_enable(QM_IRQ_I2C_0_INT);
QM_INTERRUPT_ROUTER->i2c_master_0_int_mask &= ~BIT(0);
break;
#ifdef CONFIG_I2C_1
case QM_I2C_1:
IRQ_CONNECT(QM_IRQ_I2C_1_INT,
CONFIG_I2C_1_IRQ_PRI, qm_i2c_1_irq_isr, NULL,
(IOAPIC_LEVEL | IOAPIC_HIGH));
irq_enable(QM_IRQ_I2C_1_INT);
QM_INTERRUPT_ROUTER->i2c_master_1_int_mask &= ~BIT(0);
break;
#endif /* CONFIG_I2C_1 */
default:
return -EIO;
}
clk_periph_enable(config->clock_gate);
err = i2c_qmsi_configure(dev, config->default_cfg.raw);
if (err < 0) {
return err;
}
dev->driver_api = &api;
i2c_qmsi_set_power_state(dev, DEVICE_PM_ACTIVE_STATE);
return 0;
}