blob: 9e211639c64cb5a598c16d3cc527fe57e65b3619 [file] [log] [blame]
/*
* Copyright (c) 2017, Christian Taedcke
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <errno.h>
#include <drivers/gpio.h>
#include <soc.h>
#include <em_gpio.h>
#include "gpio_utils.h"
/*
* Macros to set the GPIO MODE registers
*
* See https://www.silabs.com/documents/public/reference-manuals/EFM32WG-RM.pdf
* pages 972 and 982.
*/
/**
* @brief Create the value to set the GPIO MODEL register
* @param[in] pin The index of the pin. Valid values are 0..7.
* @param[in] mode The mode that should be set.
* @return The value that can be set into the GPIO MODEL register.
*/
#define GECKO_GPIO_MODEL(pin, mode) (mode << (pin * 4))
/**
* @brief Create the value to set the GPIO MODEH register
* @param[in] pin The index of the pin. Valid values are 8..15.
* @param[in] mode The mode that should be set.
* @return The value that can be set into the GPIO MODEH register.
*/
#define GECKO_GPIO_MODEH(pin, mode) (mode << ((pin - 8) * 4))
#define member_size(type, member) sizeof(((type *)0)->member)
#define NUMBER_OF_PORTS (member_size(GPIO_TypeDef, P) / \
member_size(GPIO_TypeDef, P[0]))
struct gpio_gecko_common_config {
};
struct gpio_gecko_common_data {
/* a list of all ports */
struct device *ports[NUMBER_OF_PORTS];
size_t count;
};
struct gpio_gecko_config {
GPIO_P_TypeDef *gpio_base;
GPIO_Port_TypeDef gpio_index;
};
struct gpio_gecko_data {
/* port ISR callback routine address */
sys_slist_t callbacks;
/* pin callback routine enable flags, by pin number */
u32_t pin_callback_enables;
};
static inline void gpio_gecko_add_port(struct gpio_gecko_common_data *data,
struct device *dev)
{
__ASSERT(dev, "No port device!");
data->ports[data->count++] = dev;
}
static int gpio_gecko_configure(struct device *dev,
int access_op, u32_t pin, int flags)
{
const struct gpio_gecko_config *config = dev->config->config_info;
GPIO_P_TypeDef *gpio_base = config->gpio_base;
GPIO_Port_TypeDef gpio_index = config->gpio_index;
GPIO_Mode_TypeDef mode;
unsigned int out = 0U;
/* Check for an invalid pin configuration */
if ((flags & GPIO_INT) && (flags & GPIO_DIR_OUT)) {
return -EINVAL;
}
/* Interrupt on static level is not supported by the hardware */
if ((flags & GPIO_INT) && !(flags & GPIO_INT_EDGE)) {
return -ENOTSUP;
}
/* Setting interrupt flags for a complete port is not implemented */
if ((flags & GPIO_INT) && (access_op == GPIO_ACCESS_BY_PORT)) {
return -ENOTSUP;
}
if ((flags & GPIO_DIR_MASK) == GPIO_DIR_IN) {
if ((flags & GPIO_PUD_MASK) == GPIO_PUD_PULL_UP) {
mode = gpioModeInputPull;
out = 1U; /* pull-up*/
} else if ((flags & GPIO_PUD_MASK) == GPIO_PUD_PULL_DOWN) {
mode = gpioModeInputPull;
/* out = 0 means pull-down*/
} else {
mode = gpioModeInput;
}
} else { /* GPIO_DIR_OUT */
mode = gpioModePushPull;
}
/* The flags contain options that require touching registers in the
* GPIO module and the corresponding PORT module.
*
* Start with the GPIO module and set up the pin direction register.
* 0 - pin is input, 1 - pin is output
*/
if (access_op == GPIO_ACCESS_BY_PIN) {
GPIO_PinModeSet(gpio_index, pin, mode, out);
} else { /* GPIO_ACCESS_BY_PORT */
gpio_base->MODEL = GECKO_GPIO_MODEL(7, mode)
| GECKO_GPIO_MODEL(6, mode) | GECKO_GPIO_MODEL(5, mode)
| GECKO_GPIO_MODEL(4, mode) | GECKO_GPIO_MODEL(3, mode)
| GECKO_GPIO_MODEL(2, mode) | GECKO_GPIO_MODEL(1, mode)
| GECKO_GPIO_MODEL(0, mode);
gpio_base->MODEH = GECKO_GPIO_MODEH(15, mode)
| GECKO_GPIO_MODEH(14, mode)
| GECKO_GPIO_MODEH(13, mode)
| GECKO_GPIO_MODEH(12, mode)
| GECKO_GPIO_MODEH(11, mode)
| GECKO_GPIO_MODEH(10, mode)
| GECKO_GPIO_MODEH(9, mode)
| GECKO_GPIO_MODEH(8, mode);
gpio_base->DOUT = (out ? 0xFFFF : 0x0000);
}
if (access_op == GPIO_ACCESS_BY_PIN) {
GPIO_IntConfig(gpio_index, pin,
(flags & GPIO_INT_ACTIVE_HIGH)
|| (flags & GPIO_INT_DOUBLE_EDGE),
!(flags & GPIO_INT_ACTIVE_HIGH)
|| (flags & GPIO_INT_DOUBLE_EDGE),
!!(flags & GPIO_INT));
}
return 0;
}
static int gpio_gecko_write(struct device *dev,
int access_op, u32_t pin, u32_t value)
{
const struct gpio_gecko_config *config = dev->config->config_info;
GPIO_P_TypeDef *gpio_base = config->gpio_base;
if (access_op == GPIO_ACCESS_BY_PIN) {
if (value) {
/* Set the data output for the corresponding pin.
* Writing zeros to the other bits leaves the data
* output unchanged for the other pins.
*/
GPIO_PinOutSet(config->gpio_index, pin);
} else {
/* Clear the data output for the corresponding pin.
* Writing zeros to the other bits leaves the data
* output unchanged for the other pins.
*/
GPIO_PinOutClear(config->gpio_index, pin);
}
} else { /* GPIO_ACCESS_BY_PORT */
/* Write the data output for all the pins */
gpio_base->DOUT = value;
}
return 0;
}
static int gpio_gecko_read(struct device *dev,
int access_op, u32_t pin, u32_t *value)
{
const struct gpio_gecko_config *config = dev->config->config_info;
GPIO_P_TypeDef *gpio_base = config->gpio_base;
*value = gpio_base->DIN;
if (access_op == GPIO_ACCESS_BY_PIN) {
*value = (*value & BIT(pin)) >> pin;
}
/* nothing more to do for GPIO_ACCESS_BY_PORT */
return 0;
}
static int gpio_gecko_manage_callback(struct device *dev,
struct gpio_callback *callback, bool set)
{
struct gpio_gecko_data *data = dev->driver_data;
return gpio_manage_callback(&data->callbacks, callback, set);
}
static int gpio_gecko_enable_callback(struct device *dev,
int access_op, u32_t pin)
{
struct gpio_gecko_data *data = dev->driver_data;
if (access_op == GPIO_ACCESS_BY_PORT) {
return -ENOTSUP;
}
data->pin_callback_enables |= BIT(pin);
GPIO->IEN |= BIT(pin);
return 0;
}
static int gpio_gecko_disable_callback(struct device *dev,
int access_op, u32_t pin)
{
struct gpio_gecko_data *data = dev->driver_data;
if (access_op == GPIO_ACCESS_BY_PORT) {
return -ENOTSUP;
}
data->pin_callback_enables &= ~BIT(pin);
GPIO->IEN &= ~BIT(pin);
return 0;
}
/**
* Handler for both odd and even pin interrupts
*/
static void gpio_gecko_common_isr(void *arg)
{
struct device *dev = (struct device *)arg;
struct gpio_gecko_common_data *data = dev->driver_data;
u32_t enabled_int, int_status;
struct device *port_dev;
struct gpio_gecko_data *port_data;
int_status = GPIO->IF;
for (unsigned int i = 0; int_status && (i < data->count); i++) {
port_dev = data->ports[i];
port_data = port_dev->driver_data;
enabled_int = int_status & port_data->pin_callback_enables;
int_status &= ~enabled_int;
gpio_fire_callbacks(&port_data->callbacks, port_dev,
enabled_int);
}
/* Clear the pending interrupts */
GPIO->IFC = 0xFFFF;
}
static const struct gpio_driver_api gpio_gecko_driver_api = {
.config = gpio_gecko_configure,
.write = gpio_gecko_write,
.read = gpio_gecko_read,
.manage_callback = gpio_gecko_manage_callback,
.enable_callback = gpio_gecko_enable_callback,
.disable_callback = gpio_gecko_disable_callback,
};
static const struct gpio_driver_api gpio_gecko_common_driver_api = {
.manage_callback = gpio_gecko_manage_callback,
.enable_callback = gpio_gecko_enable_callback,
.disable_callback = gpio_gecko_disable_callback,
};
#ifdef CONFIG_GPIO_GECKO
static int gpio_gecko_common_init(struct device *dev);
static const struct gpio_gecko_common_config gpio_gecko_common_config = {
};
static struct gpio_gecko_common_data gpio_gecko_common_data;
DEVICE_AND_API_INIT(gpio_gecko_common, DT_GPIO_GECKO_COMMON_NAME,
gpio_gecko_common_init,
&gpio_gecko_common_data, &gpio_gecko_common_config,
POST_KERNEL, CONFIG_GPIO_GECKO_COMMON_INIT_PRIORITY,
&gpio_gecko_common_driver_api);
static int gpio_gecko_common_init(struct device *dev)
{
gpio_gecko_common_data.count = 0;
IRQ_CONNECT(GPIO_EVEN_IRQn, DT_GPIO_GECKO_COMMON_EVEN_PRI,
gpio_gecko_common_isr, DEVICE_GET(gpio_gecko_common), 0);
IRQ_CONNECT(GPIO_ODD_IRQn, DT_GPIO_GECKO_COMMON_ODD_PRI,
gpio_gecko_common_isr, DEVICE_GET(gpio_gecko_common), 0);
irq_enable(GPIO_EVEN_IRQn);
irq_enable(GPIO_ODD_IRQn);
return 0;
}
#endif /* CONFIG_GPIO_GECKO */
#define GPIO_PORT_INIT(pl, pu) \
static int gpio_gecko_port##pl##_init(struct device *dev); \
\
static const struct gpio_gecko_config gpio_gecko_port##pl##_config = { \
.gpio_base = &GPIO->P[gpioPort##pu], \
.gpio_index = gpioPort##pu, \
}; \
\
static struct gpio_gecko_data gpio_gecko_port##pl##_data; \
\
DEVICE_AND_API_INIT(gpio_gecko_port##pl, DT_GPIO_GECKO_PORT##pu##_NAME, \
gpio_gecko_port##pl##_init, \
&gpio_gecko_port##pl##_data, \
&gpio_gecko_port##pl##_config, \
POST_KERNEL, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT, \
&gpio_gecko_driver_api); \
\
static int gpio_gecko_port##pl##_init(struct device *dev) \
{ \
gpio_gecko_add_port(&gpio_gecko_common_data, dev); \
return 0; \
}
#ifdef CONFIG_GPIO_GECKO_PORTA
GPIO_PORT_INIT(a, A)
#endif /* CONFIG_GPIO_GECKO_PORTA */
#ifdef CONFIG_GPIO_GECKO_PORTB
GPIO_PORT_INIT(b, B)
#endif /* CONFIG_GPIO_GECKO_PORTB */
#ifdef CONFIG_GPIO_GECKO_PORTC
GPIO_PORT_INIT(c, C)
#endif /* CONFIG_GPIO_GECKO_PORTC */
#ifdef CONFIG_GPIO_GECKO_PORTD
GPIO_PORT_INIT(d, D)
#endif /* CONFIG_GPIO_GECKO_PORTD */
#ifdef CONFIG_GPIO_GECKO_PORTE
GPIO_PORT_INIT(e, E)
#endif /* CONFIG_GPIO_GECKO_PORTE */
#ifdef CONFIG_GPIO_GECKO_PORTF
GPIO_PORT_INIT(f, F)
#endif /* CONFIG_GPIO_GECKO_PORTF */
#ifdef CONFIG_GPIO_GECKO_PORTG
GPIO_PORT_INIT(g, G)
#endif /* CONFIG_GPIO_GECKO_PORTG */
#ifdef CONFIG_GPIO_GECKO_PORTH
GPIO_PORT_INIT(h, H)
#endif /* CONFIG_GPIO_GECKO_PORTH */
#ifdef CONFIG_GPIO_GECKO_PORTI
GPIO_PORT_INIT(i, I)
#endif /* CONFIG_GPIO_GECKO_PORTI */
#ifdef CONFIG_GPIO_GECKO_PORTJ
GPIO_PORT_INIT(j, J)
#endif /* CONFIG_GPIO_GECKO_PORTJ */
#ifdef CONFIG_GPIO_GECKO_PORTK
GPIO_PORT_INIT(k, K)
#endif /* CONFIG_GPIO_GECKO_PORTK */