364 lines
9.5 KiB
C
364 lines
9.5 KiB
C
/*
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* Copyright (c) 2017, Christian Taedcke
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#define DT_DRV_COMPAT silabs_gecko_gpio_port
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#include <errno.h>
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#include <drivers/gpio.h>
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#include <soc.h>
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#include <em_gpio.h>
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#include "gpio_utils.h"
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/*
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* Macros to set the GPIO MODE registers
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*
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* See https://www.silabs.com/documents/public/reference-manuals/EFM32WG-RM.pdf
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* pages 972 and 982.
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*/
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/**
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* @brief Create the value to set the GPIO MODEL register
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* @param[in] pin The index of the pin. Valid values are 0..7.
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* @param[in] mode The mode that should be set.
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* @return The value that can be set into the GPIO MODEL register.
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*/
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#define GECKO_GPIO_MODEL(pin, mode) (mode << (pin * 4))
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/**
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* @brief Create the value to set the GPIO MODEH register
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* @param[in] pin The index of the pin. Valid values are 8..15.
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* @param[in] mode The mode that should be set.
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* @return The value that can be set into the GPIO MODEH register.
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*/
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#define GECKO_GPIO_MODEH(pin, mode) (mode << ((pin - 8) * 4))
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#define member_size(type, member) sizeof(((type *)0)->member)
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#define NUMBER_OF_PORTS (member_size(GPIO_TypeDef, P) / \
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member_size(GPIO_TypeDef, P[0]))
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struct gpio_gecko_common_config {
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};
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struct gpio_gecko_common_data {
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/* a list of all ports */
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struct device *ports[NUMBER_OF_PORTS];
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size_t count;
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};
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struct gpio_gecko_config {
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/* gpio_driver_config needs to be first */
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struct gpio_driver_config common;
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GPIO_P_TypeDef *gpio_base;
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GPIO_Port_TypeDef gpio_index;
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};
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struct gpio_gecko_data {
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/* gpio_driver_data needs to be first */
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struct gpio_driver_data common;
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/* port ISR callback routine address */
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sys_slist_t callbacks;
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/* pin callback routine enable flags, by pin number */
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u32_t pin_callback_enables;
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};
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static inline void gpio_gecko_add_port(struct gpio_gecko_common_data *data,
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struct device *dev)
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{
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__ASSERT(dev, "No port device!");
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data->ports[data->count++] = dev;
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}
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static int gpio_gecko_configure(struct device *dev,
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gpio_pin_t pin,
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gpio_flags_t flags)
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{
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const struct gpio_gecko_config *config = dev->config_info;
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GPIO_Port_TypeDef gpio_index = config->gpio_index;
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GPIO_Mode_TypeDef mode;
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unsigned int out = 0U;
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if (flags & GPIO_OUTPUT) {
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/* Following modes enable both output and input */
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if (flags & GPIO_SINGLE_ENDED) {
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if (flags & GPIO_LINE_OPEN_DRAIN) {
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mode = gpioModeWiredAnd;
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} else {
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mode = gpioModeWiredOr;
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}
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} else {
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mode = gpioModePushPull;
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}
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if (flags & GPIO_OUTPUT_INIT_HIGH) {
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out = 1U;
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} else if (flags & GPIO_OUTPUT_INIT_LOW) {
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out = 0U;
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} else {
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out = GPIO_PinOutGet(gpio_index, pin);
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}
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} else if (flags & GPIO_INPUT) {
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if (flags & GPIO_PULL_UP) {
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mode = gpioModeInputPull;
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out = 1U; /* pull-up*/
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} else if (flags & GPIO_PULL_DOWN) {
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mode = gpioModeInputPull;
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/* out = 0 means pull-down*/
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} else {
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mode = gpioModeInput;
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}
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} else {
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/* Neither input nor output mode is selected */
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mode = gpioModeDisabled;
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}
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/* The flags contain options that require touching registers in the
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* GPIO module and the corresponding PORT module.
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*
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* Start with the GPIO module and set up the pin direction register.
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* 0 - pin is input, 1 - pin is output
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*/
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GPIO_PinModeSet(gpio_index, pin, mode, out);
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return 0;
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}
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static int gpio_gecko_port_get_raw(struct device *dev, u32_t *value)
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{
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const struct gpio_gecko_config *config = dev->config_info;
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GPIO_P_TypeDef *gpio_base = config->gpio_base;
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*value = gpio_base->DIN;
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return 0;
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}
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static int gpio_gecko_port_set_masked_raw(struct device *dev, u32_t mask,
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u32_t value)
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{
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const struct gpio_gecko_config *config = dev->config_info;
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GPIO_P_TypeDef *gpio_base = config->gpio_base;
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gpio_base->DOUT = (gpio_base->DOUT & ~mask) | (mask & value);
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return 0;
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}
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static int gpio_gecko_port_set_bits_raw(struct device *dev, u32_t mask)
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{
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const struct gpio_gecko_config *config = dev->config_info;
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GPIO_P_TypeDef *gpio_base = config->gpio_base;
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#if defined(_GPIO_P_DOUTSET_MASK)
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gpio_base->DOUTSET = mask;
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#else
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BUS_RegMaskedSet(&gpio_base->DOUT, mask);
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#endif
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return 0;
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}
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static int gpio_gecko_port_clear_bits_raw(struct device *dev, u32_t mask)
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{
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const struct gpio_gecko_config *config = dev->config_info;
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GPIO_P_TypeDef *gpio_base = config->gpio_base;
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#if defined(_GPIO_P_DOUTCLR_MASK)
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gpio_base->DOUTCLR = mask;
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#else
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BUS_RegMaskedClear(&gpio_base->DOUT, mask);
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#endif
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return 0;
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}
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static int gpio_gecko_port_toggle_bits(struct device *dev, u32_t mask)
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{
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const struct gpio_gecko_config *config = dev->config_info;
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GPIO_P_TypeDef *gpio_base = config->gpio_base;
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gpio_base->DOUTTGL = mask;
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return 0;
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}
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static int gpio_gecko_pin_interrupt_configure(struct device *dev,
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gpio_pin_t pin, enum gpio_int_mode mode,
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enum gpio_int_trig trig)
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{
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const struct gpio_gecko_config *config = dev->config_info;
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struct gpio_gecko_data *data = dev->driver_data;
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/* Interrupt on static level is not supported by the hardware */
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if (mode == GPIO_INT_MODE_LEVEL) {
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return -ENOTSUP;
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}
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if (mode == GPIO_INT_MODE_DISABLED) {
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GPIO_IntDisable(BIT(pin));
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} else {
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/* Interrupt line is already in use */
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if ((GPIO->IEN & BIT(pin)) != 0) {
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/* TODO: Return an error only if request is done for
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* a pin from a different port.
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*/
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return -EBUSY;
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}
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bool rising_edge = true;
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bool falling_edge = true;
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if (trig == GPIO_INT_TRIG_LOW) {
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rising_edge = false;
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falling_edge = true;
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} else if (trig == GPIO_INT_TRIG_HIGH) {
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rising_edge = true;
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falling_edge = false;
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} /* default is GPIO_INT_TRIG_BOTH */
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GPIO_IntConfig(config->gpio_index, pin,
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rising_edge, falling_edge, true);
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}
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WRITE_BIT(data->pin_callback_enables, pin, mode != GPIO_INT_DISABLE);
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return 0;
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}
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static int gpio_gecko_manage_callback(struct device *dev,
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struct gpio_callback *callback, bool set)
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{
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struct gpio_gecko_data *data = dev->driver_data;
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return gpio_manage_callback(&data->callbacks, callback, set);
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}
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static int gpio_gecko_enable_callback(struct device *dev,
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gpio_pin_t pin)
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{
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struct gpio_gecko_data *data = dev->driver_data;
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data->pin_callback_enables |= BIT(pin);
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GPIO->IEN |= BIT(pin);
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return 0;
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}
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static int gpio_gecko_disable_callback(struct device *dev,
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gpio_pin_t pin)
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{
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struct gpio_gecko_data *data = dev->driver_data;
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data->pin_callback_enables &= ~BIT(pin);
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GPIO->IEN &= ~BIT(pin);
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return 0;
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}
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/**
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* Handler for both odd and even pin interrupts
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*/
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static void gpio_gecko_common_isr(void *arg)
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{
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struct device *dev = (struct device *)arg;
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struct gpio_gecko_common_data *data = dev->driver_data;
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u32_t enabled_int, int_status;
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struct device *port_dev;
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struct gpio_gecko_data *port_data;
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int_status = GPIO->IF;
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for (unsigned int i = 0; int_status && (i < data->count); i++) {
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port_dev = data->ports[i];
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port_data = port_dev->driver_data;
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enabled_int = int_status & port_data->pin_callback_enables;
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if (enabled_int != 0) {
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int_status &= ~enabled_int;
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GPIO->IFC = enabled_int;
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gpio_fire_callbacks(&port_data->callbacks, port_dev,
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enabled_int);
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}
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}
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}
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static const struct gpio_driver_api gpio_gecko_driver_api = {
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.pin_configure = gpio_gecko_configure,
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.port_get_raw = gpio_gecko_port_get_raw,
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.port_set_masked_raw = gpio_gecko_port_set_masked_raw,
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.port_set_bits_raw = gpio_gecko_port_set_bits_raw,
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.port_clear_bits_raw = gpio_gecko_port_clear_bits_raw,
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.port_toggle_bits = gpio_gecko_port_toggle_bits,
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.pin_interrupt_configure = gpio_gecko_pin_interrupt_configure,
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.manage_callback = gpio_gecko_manage_callback,
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.enable_callback = gpio_gecko_enable_callback,
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.disable_callback = gpio_gecko_disable_callback,
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};
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static const struct gpio_driver_api gpio_gecko_common_driver_api = {
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.manage_callback = gpio_gecko_manage_callback,
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.enable_callback = gpio_gecko_enable_callback,
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.disable_callback = gpio_gecko_disable_callback,
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};
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static int gpio_gecko_common_init(struct device *dev);
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static const struct gpio_gecko_common_config gpio_gecko_common_config = {
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};
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static struct gpio_gecko_common_data gpio_gecko_common_data;
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DEVICE_AND_API_INIT(gpio_gecko_common, DT_LABEL(DT_INST(0, silabs_gecko_gpio)),
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gpio_gecko_common_init,
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&gpio_gecko_common_data, &gpio_gecko_common_config,
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POST_KERNEL, CONFIG_GPIO_GECKO_COMMON_INIT_PRIORITY,
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&gpio_gecko_common_driver_api);
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static int gpio_gecko_common_init(struct device *dev)
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{
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gpio_gecko_common_data.count = 0;
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IRQ_CONNECT(GPIO_EVEN_IRQn,
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DT_IRQ_BY_NAME(DT_INST(0, silabs_gecko_gpio), gpio_even, priority),
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gpio_gecko_common_isr, DEVICE_GET(gpio_gecko_common), 0);
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IRQ_CONNECT(GPIO_ODD_IRQn,
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DT_IRQ_BY_NAME(DT_INST(0, silabs_gecko_gpio), gpio_odd, priority),
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gpio_gecko_common_isr, DEVICE_GET(gpio_gecko_common), 0);
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irq_enable(GPIO_EVEN_IRQn);
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irq_enable(GPIO_ODD_IRQn);
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return 0;
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}
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#define GPIO_PORT_INIT(idx) \
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static int gpio_gecko_port##idx##_init(struct device *dev); \
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\
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static const struct gpio_gecko_config gpio_gecko_port##idx##_config = { \
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.common = { \
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.port_pin_mask = (gpio_port_pins_t)(-1), \
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}, \
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.gpio_base = (GPIO_P_TypeDef *)DT_INST_REG_ADDR(idx), \
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.gpio_index = DT_INST_PROP(idx, peripheral_id), \
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}; \
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\
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static struct gpio_gecko_data gpio_gecko_port##idx##_data; \
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\
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DEVICE_AND_API_INIT(gpio_gecko_port##idx, \
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DT_INST_LABEL(idx), \
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gpio_gecko_port##idx##_init, \
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&gpio_gecko_port##idx##_data, \
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&gpio_gecko_port##idx##_config, \
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POST_KERNEL, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT, \
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&gpio_gecko_driver_api); \
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\
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static int gpio_gecko_port##idx##_init(struct device *dev) \
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{ \
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gpio_gecko_add_port(&gpio_gecko_common_data, dev); \
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return 0; \
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}
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DT_INST_FOREACH_STATUS_OKAY(GPIO_PORT_INIT)
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