Primary Git Repository for the Zephyr Project. Zephyr is a new generation, scalable, optimized, secure RTOS for multiple hardware architectures.
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/*
* Copyright (c) 2024 Michael Hope
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <zephyr/drivers/clock_control.h>
#include <zephyr/drivers/gpio.h>
#include <zephyr/drivers/gpio/gpio_utils.h>
#include <zephyr/drivers/interrupt_controller/wch_exti.h>
#include <zephyr/dt-bindings/gpio/gpio.h>
#include <zephyr/irq.h>
#include <hal_ch32fun.h>
#define DT_DRV_COMPAT wch_gpio
struct gpio_ch32v00x_config {
struct gpio_driver_config common;
GPIO_TypeDef *regs;
const struct device *clock_dev;
uint8_t clock_id;
};
struct gpio_ch32v00x_data {
struct gpio_driver_data common;
sys_slist_t callbacks;
};
static int gpio_ch32v00x_configure(const struct device *dev, gpio_pin_t pin, gpio_flags_t flags)
{
const struct gpio_ch32v00x_config *config = dev->config;
GPIO_TypeDef *regs = config->regs;
uint32_t cnf_mode;
uint32_t bshr = 0;
if ((flags & GPIO_OUTPUT) != 0) {
cnf_mode = 0x01;
if ((flags & GPIO_OUTPUT_INIT_HIGH) != 0) {
bshr = 1 << pin;
} else if ((flags & GPIO_OUTPUT_INIT_LOW) != 0) {
bshr = 1 << (16 + pin);
}
} else if ((flags & GPIO_INPUT) != 0) {
if ((flags & GPIO_PULL_UP) != 0) {
cnf_mode = GPIO_CFGLR_IN_PUPD;
bshr = 1 << pin;
} else if ((flags & GPIO_PULL_DOWN) != 0) {
cnf_mode = GPIO_CFGLR_IN_PUPD;
bshr = 1 << (16 + pin);
} else {
cnf_mode = GPIO_CFGLR_IN_FLOAT;
}
} else {
cnf_mode = 0x00;
}
if (pin < 8) {
regs->CFGLR = (regs->CFGLR & ~(0x0F << (4 * pin))) | (cnf_mode << (4 * pin));
} else {
regs->CFGHR =
(regs->CFGHR & ~(0x0F << ((pin - 8) * 4))) | (cnf_mode << ((pin - 8) * 4));
}
regs->BSHR = bshr;
return 0;
}
static int gpio_ch32v00x_port_get_raw(const struct device *dev, uint32_t *value)
{
const struct gpio_ch32v00x_config *config = dev->config;
*value = config->regs->INDR;
return 0;
}
static int gpio_ch32v00x_port_set_masked_raw(const struct device *dev, uint32_t mask,
uint32_t value)
{
const struct gpio_ch32v00x_config *config = dev->config;
config->regs->BSHR = ((~value & mask) << 16) | (value & mask);
return 0;
}
static int gpio_ch32v00x_port_set_bits_raw(const struct device *dev, uint32_t pins)
{
const struct gpio_ch32v00x_config *config = dev->config;
config->regs->BSHR = pins;
return 0;
}
static int gpio_ch32v00x_port_clear_bits_raw(const struct device *dev, uint32_t pins)
{
const struct gpio_ch32v00x_config *config = dev->config;
config->regs->BCR = pins;
return 0;
}
static int gpio_ch32v00x_port_toggle_bits(const struct device *dev, uint32_t pins)
{
const struct gpio_ch32v00x_config *config = dev->config;
uint32_t current = config->regs->OUTDR;
config->regs->BSHR = (~current & pins) | (current & pins) << 16;
return 0;
}
#if defined(CONFIG_GPIO_WCH_GPIO_INTERRUPTS)
static void gpio_ch32v00x_isr(uint8_t line, void *user)
{
const struct device *dev = user;
struct gpio_ch32v00x_data *data = dev->data;
gpio_fire_callbacks(&data->callbacks, dev, BIT(line));
}
static int gpio_ch32v00x_configure_exti(const struct device *dev, gpio_pin_t pin)
{
const struct gpio_ch32v00x_config *config = dev->config;
AFIO_TypeDef *afio = (AFIO_TypeDef *)DT_REG_ADDR(DT_NODELABEL(pinctrl));
uint8_t port_id;
uint8_t cr_id;
uint8_t bit0;
/* Convert the device into a port ID by checking the address */
switch ((uintptr_t)config->regs) {
case DT_REG_ADDR(DT_NODELABEL(gpioa)):
port_id = 0;
break;
#if DT_NODE_EXISTS(DT_NODELABEL(gpiob))
case DT_REG_ADDR(DT_NODELABEL(gpiob)):
port_id = 1;
break;
#endif
case DT_REG_ADDR(DT_NODELABEL(gpioc)):
port_id = 2;
break;
case DT_REG_ADDR(DT_NODELABEL(gpiod)):
port_id = 3;
break;
#if DT_NODE_EXISTS(DT_NODELABEL(gpioe))
case DT_REG_ADDR(DT_NODELABEL(gpioe)):
port_id = 4;
break;
#endif
default:
return -EINVAL;
}
#if defined(AFIO_EXTICR_EXTI0)
/* CH32V003 style with one register with 2 bits per map. */
BUILD_ASSERT(AFIO_EXTICR_EXTI0 == 0x03);
(void)cr_id;
bit0 = pin << 1;
afio->EXTICR = (afio->EXTICR & ~(AFIO_EXTICR_EXTI0 << bit0)) | (port_id << bit0);
#elif defined(AFIO_EXTICR1_EXTI0)
/*
* CH32V20x style with multiple registers with 4 pins per register and 4 bits per
* map.
*/
BUILD_ASSERT(AFIO_EXTICR1_EXTI0 == 0x0F);
BUILD_ASSERT(ARRAY_SIZE(afio->EXTICR) == 4);
cr_id = pin / 4;
bit0 = (pin % 4) * 4;
afio->EXTICR[cr_id] =
(afio->EXTICR[cr_id] & ~(AFIO_EXTICR1_EXTI0 << bit0)) | (port_id << bit0);
#else
#error Unrecognised EXTICR format
#endif
return 0;
}
static int gpio_ch32v00x_pin_interrupt_configure(const struct device *dev, gpio_pin_t pin,
enum gpio_int_mode mode,
enum gpio_int_trig trigger)
{
int err;
switch (mode) {
case GPIO_INT_MODE_DISABLED:
wch_exti_disable(pin);
err = wch_exti_configure(pin, NULL, NULL);
break;
case GPIO_INT_MODE_EDGE:
err = wch_exti_configure(pin, gpio_ch32v00x_isr, (void *)dev);
if (err != 0) {
break;
}
err = gpio_ch32v00x_configure_exti(dev, pin);
if (err != 0) {
break;
}
switch (trigger) {
case GPIO_INT_TRIG_LOW:
wch_exti_set_trigger(pin, WCH_EXTI_TRIGGER_FALLING_EDGE);
break;
case GPIO_INT_TRIG_HIGH:
wch_exti_set_trigger(pin, WCH_EXTI_TRIGGER_RISING_EDGE);
break;
case GPIO_INT_TRIG_BOTH:
wch_exti_set_trigger(pin, WCH_EXTI_TRIGGER_FALLING_EDGE |
WCH_EXTI_TRIGGER_RISING_EDGE);
break;
default:
return -ENOTSUP;
}
wch_exti_enable(pin);
break;
default:
return -ENOTSUP;
}
return err;
}
static int gpio_ch32v00x_manage_callback(const struct device *dev, struct gpio_callback *callback,
bool set)
{
struct gpio_ch32v00x_data *data = dev->data;
return gpio_manage_callback(&data->callbacks, callback, set);
}
#endif /* CONFIG_GPIO_WCH_GPIO_INTERRUPTS */
static DEVICE_API(gpio, gpio_ch32v00x_driver_api) = {
.pin_configure = gpio_ch32v00x_configure,
.port_get_raw = gpio_ch32v00x_port_get_raw,
.port_set_masked_raw = gpio_ch32v00x_port_set_masked_raw,
.port_set_bits_raw = gpio_ch32v00x_port_set_bits_raw,
.port_clear_bits_raw = gpio_ch32v00x_port_clear_bits_raw,
.port_toggle_bits = gpio_ch32v00x_port_toggle_bits,
#if defined(CONFIG_GPIO_WCH_GPIO_INTERRUPTS)
.pin_interrupt_configure = gpio_ch32v00x_pin_interrupt_configure,
.manage_callback = gpio_ch32v00x_manage_callback,
#endif
};
static int gpio_ch32v00x_init(const struct device *dev)
{
const struct gpio_ch32v00x_config *config = dev->config;
clock_control_on(config->clock_dev, (clock_control_subsys_t *)(uintptr_t)config->clock_id);
return 0;
}
#define GPIO_CH32V00X_INIT(idx) \
static const struct gpio_ch32v00x_config gpio_ch32v00x_##idx##_config = { \
.common = \
{ \
.port_pin_mask = GPIO_PORT_PIN_MASK_FROM_DT_INST(idx), \
}, \
.regs = (GPIO_TypeDef *)DT_INST_REG_ADDR(idx), \
.clock_dev = DEVICE_DT_GET(DT_INST_CLOCKS_CTLR(idx)), \
.clock_id = DT_INST_CLOCKS_CELL(idx, id), \
}; \
\
static struct gpio_ch32v00x_data gpio_ch32v00x_##idx##_data; \
\
DEVICE_DT_INST_DEFINE(idx, gpio_ch32v00x_init, NULL, &gpio_ch32v00x_##idx##_data, \
&gpio_ch32v00x_##idx##_config, PRE_KERNEL_1, \
CONFIG_GPIO_INIT_PRIORITY, &gpio_ch32v00x_driver_api);
DT_INST_FOREACH_STATUS_OKAY(GPIO_CH32V00X_INIT)