blob: 959df4960e92e12143d29062d20bf8bbe6742c7f [file] [log] [blame] [edit]
/*
* Copyright (c) 2020 IoT.bzh
*
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT renesas_rcar_gpio
#include <errno.h>
#include <zephyr/kernel.h>
#include <zephyr/device.h>
#include <zephyr/init.h>
#include <zephyr/drivers/gpio.h>
#include <zephyr/drivers/clock_control.h>
#include <zephyr/drivers/clock_control/renesas_cpg_mssr.h>
#include <zephyr/irq.h>
#include <zephyr/drivers/gpio/gpio_utils.h>
typedef void (*init_func_t)(const struct device *dev);
struct gpio_rcar_cfg {
struct gpio_driver_config common;
uint32_t reg_addr;
int reg_size;
init_func_t init_func;
const struct device *clock_dev;
struct rcar_cpg_clk mod_clk;
};
struct gpio_rcar_data {
struct gpio_driver_data common;
sys_slist_t cb;
};
#define IOINTSEL 0x00 /* General IO/Interrupt Switching Register */
#define INOUTSEL 0x04 /* General Input/Output Switching Register */
#define OUTDT 0x08 /* General Output Register */
#define INDT 0x0c /* General Input Register */
#define INTDT 0x10 /* Interrupt Display Register */
#define INTCLR 0x14 /* Interrupt Clear Register */
#define INTMSK 0x18 /* Interrupt Mask Register */
#define MSKCLR 0x1c /* Interrupt Mask Clear Register */
#define POSNEG 0x20 /* Positive/Negative Logic Select Register */
#define EDGLEVEL 0x24 /* Edge/level Select Register */
#define FILONOFF 0x28 /* Chattering Prevention On/Off Register */
#define OUTDTSEL 0x40 /* Output Data Select Register */
#define BOTHEDGE 0x4c /* One Edge/Both Edge Select Register */
static inline uint32_t gpio_rcar_read(const struct gpio_rcar_cfg *config,
uint32_t offs)
{
return sys_read32(config->reg_addr + offs);
}
static inline void gpio_rcar_write(const struct gpio_rcar_cfg *config,
uint32_t offs, uint32_t value)
{
sys_write32(value, config->reg_addr + offs);
}
static void gpio_rcar_modify_bit(const struct gpio_rcar_cfg *config,
uint32_t offs, int bit, bool value)
{
uint32_t tmp = gpio_rcar_read(config, offs);
if (value) {
tmp |= BIT(bit);
} else {
tmp &= ~BIT(bit);
}
gpio_rcar_write(config, offs, tmp);
}
static void gpio_rcar_port_isr(const struct device *dev)
{
const struct gpio_rcar_cfg *config = dev->config;
struct gpio_rcar_data *data = dev->data;
uint32_t pending, fsb, mask;
pending = gpio_rcar_read(config, INTDT);
mask = gpio_rcar_read(config, INTMSK);
while ((pending = gpio_rcar_read(config, INTDT) &
gpio_rcar_read(config, INTMSK))) {
fsb = find_lsb_set(pending) - 1;
gpio_fire_callbacks(&data->cb, dev, BIT(fsb));
gpio_rcar_write(config, INTCLR, BIT(fsb));
}
}
static void gpio_rcar_config_general_input_output_mode(
const struct gpio_rcar_cfg *config,
uint32_t gpio,
bool output)
{
/* follow steps in the GPIO documentation for
* "Setting General Output Mode" and
* "Setting General Input Mode"
*/
/* Configure positive logic in POSNEG */
gpio_rcar_modify_bit(config, POSNEG, gpio, false);
/* Select "General Input/Output Mode" in IOINTSEL */
gpio_rcar_modify_bit(config, IOINTSEL, gpio, false);
/* Select Input Mode or Output Mode in INOUTSEL */
gpio_rcar_modify_bit(config, INOUTSEL, gpio, output);
/* Select General Output Register to output data in OUTDTSEL */
if (output) {
gpio_rcar_modify_bit(config, OUTDTSEL, gpio, false);
}
}
static int gpio_rcar_configure(const struct device *dev,
gpio_pin_t pin, gpio_flags_t flags)
{
const struct gpio_rcar_cfg *config = dev->config;
if ((flags & GPIO_OUTPUT) && (flags & GPIO_INPUT)) {
/* Pin cannot be configured as input and output */
return -ENOTSUP;
} else if (!(flags & (GPIO_INPUT | GPIO_OUTPUT))) {
/* Pin has to be configured as input or output */
return -ENOTSUP;
}
if (flags & GPIO_OUTPUT) {
if (flags & GPIO_OUTPUT_INIT_HIGH) {
gpio_rcar_modify_bit(config, OUTDT, pin, true);
} else if (flags & GPIO_OUTPUT_INIT_LOW) {
gpio_rcar_modify_bit(config, OUTDT, pin, false);
}
gpio_rcar_config_general_input_output_mode(config, pin, true);
} else {
gpio_rcar_config_general_input_output_mode(config, pin, false);
}
return 0;
}
static int gpio_rcar_port_get_raw(const struct device *dev,
gpio_port_value_t *value)
{
const struct gpio_rcar_cfg *config = dev->config;
*value = gpio_rcar_read(config, INDT);
return 0;
}
static int gpio_rcar_port_set_masked_raw(const struct device *dev,
gpio_port_pins_t mask,
gpio_port_value_t value)
{
const struct gpio_rcar_cfg *config = dev->config;
uint32_t port_val;
port_val = gpio_rcar_read(config, OUTDT);
port_val = (port_val & ~mask) | (value & mask);
gpio_rcar_write(config, OUTDT, port_val);
return 0;
}
static int gpio_rcar_port_set_bits_raw(const struct device *dev,
gpio_port_pins_t pins)
{
const struct gpio_rcar_cfg *config = dev->config;
uint32_t port_val;
port_val = gpio_rcar_read(config, OUTDT);
port_val |= pins;
gpio_rcar_write(config, OUTDT, port_val);
return 0;
}
static int gpio_rcar_port_clear_bits_raw(const struct device *dev,
gpio_port_pins_t pins)
{
const struct gpio_rcar_cfg *config = dev->config;
uint32_t port_val;
port_val = gpio_rcar_read(config, OUTDT);
port_val &= ~pins;
gpio_rcar_write(config, OUTDT, port_val);
return 0;
}
static int gpio_rcar_port_toggle_bits(const struct device *dev,
gpio_port_pins_t pins)
{
const struct gpio_rcar_cfg *config = dev->config;
uint32_t port_val;
port_val = gpio_rcar_read(config, OUTDT);
port_val ^= pins;
gpio_rcar_write(config, OUTDT, port_val);
return 0;
}
static int gpio_rcar_pin_interrupt_configure(const struct device *dev,
gpio_pin_t pin,
enum gpio_int_mode mode,
enum gpio_int_trig trig)
{
const struct gpio_rcar_cfg *config = dev->config;
if (mode == GPIO_INT_MODE_DISABLED) {
return -ENOTSUP;
}
/* Configure positive or negative logic in POSNEG */
gpio_rcar_modify_bit(config, POSNEG, pin,
(trig == GPIO_INT_TRIG_LOW));
/* Configure edge or level trigger in EDGLEVEL */
if (mode == GPIO_INT_MODE_EDGE) {
gpio_rcar_modify_bit(config, EDGLEVEL, pin, true);
} else {
gpio_rcar_modify_bit(config, EDGLEVEL, pin, false);
}
if (trig == GPIO_INT_TRIG_BOTH) {
gpio_rcar_modify_bit(config, BOTHEDGE, pin, true);
}
gpio_rcar_modify_bit(config, IOINTSEL, pin, true);
if (mode == GPIO_INT_MODE_EDGE) {
/* Write INTCLR in case of edge trigger */
gpio_rcar_write(config, INTCLR, BIT(pin));
}
gpio_rcar_write(config, MSKCLR, BIT(pin));
return 0;
}
static int gpio_rcar_init(const struct device *dev)
{
const struct gpio_rcar_cfg *config = dev->config;
int ret;
if (!device_is_ready(config->clock_dev)) {
return -ENODEV;
}
ret = clock_control_on(config->clock_dev,
(clock_control_subsys_t) &config->mod_clk);
if (ret < 0) {
return ret;
}
config->init_func(dev);
return 0;
}
static int gpio_rcar_manage_callback(const struct device *dev,
struct gpio_callback *callback,
bool set)
{
struct gpio_rcar_data *data = dev->data;
return gpio_manage_callback(&data->cb, callback, set);
}
static const struct gpio_driver_api gpio_rcar_driver_api = {
.pin_configure = gpio_rcar_configure,
.port_get_raw = gpio_rcar_port_get_raw,
.port_set_masked_raw = gpio_rcar_port_set_masked_raw,
.port_set_bits_raw = gpio_rcar_port_set_bits_raw,
.port_clear_bits_raw = gpio_rcar_port_clear_bits_raw,
.port_toggle_bits = gpio_rcar_port_toggle_bits,
.pin_interrupt_configure = gpio_rcar_pin_interrupt_configure,
.manage_callback = gpio_rcar_manage_callback,
};
/* Device Instantiation */
#define GPIO_RCAR_INIT(n) \
static void gpio_rcar_##n##_init(const struct device *dev); \
static const struct gpio_rcar_cfg gpio_rcar_cfg_##n = { \
.common = { \
.port_pin_mask = \
GPIO_PORT_PIN_MASK_FROM_DT_INST(n), \
}, \
.reg_addr = DT_INST_REG_ADDR(n), \
.reg_size = DT_INST_REG_SIZE(n), \
.init_func = gpio_rcar_##n##_init, \
.clock_dev = DEVICE_DT_GET(DT_INST_CLOCKS_CTLR(n)), \
.mod_clk.module = \
DT_INST_CLOCKS_CELL_BY_IDX(n, 0, module), \
.mod_clk.domain = \
DT_INST_CLOCKS_CELL_BY_IDX(n, 0, domain), \
}; \
static struct gpio_rcar_data gpio_rcar_data_##n; \
\
DEVICE_DT_INST_DEFINE(n, \
gpio_rcar_init, \
NULL, \
&gpio_rcar_data_##n, \
&gpio_rcar_cfg_##n, \
PRE_KERNEL_1, \
CONFIG_GPIO_INIT_PRIORITY, \
&gpio_rcar_driver_api \
); \
static void gpio_rcar_##n##_init(const struct device *dev) \
{ \
IRQ_CONNECT(DT_INST_IRQN(n), \
0, \
gpio_rcar_port_isr, \
DEVICE_DT_INST_GET(n), 0); \
\
irq_enable(DT_INST_IRQN(n)); \
}
DT_INST_FOREACH_STATUS_OKAY(GPIO_RCAR_INIT)