blob: 433962e105856e3423b0d7f8830f918cc51cbe17 [file] [log] [blame] [edit]
/*
* Copyright (c) 2018 Zilogic Systems.
*
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT ti_stellaris_gpio
#include <errno.h>
#include <zephyr/arch/cpu.h>
#include <zephyr/device.h>
#include <zephyr/drivers/gpio.h>
#include <zephyr/irq.h>
#include <soc.h>
#include <zephyr/sys/sys_io.h>
#include <zephyr/drivers/gpio/gpio_utils.h>
typedef void (*config_func_t)(const struct device *dev);
struct gpio_stellaris_config {
/* gpio_driver_config needs to be first */
struct gpio_driver_config common;
uint32_t base;
uint32_t port_map;
config_func_t config_func;
};
struct gpio_stellaris_runtime {
/* gpio_driver_data needs to be first */
struct gpio_driver_data common;
sys_slist_t cb;
};
#define GPIO_REG_ADDR(base, offset) (base + offset)
#define GPIO_RW_ADDR(base, offset, p) \
(GPIO_REG_ADDR(base, offset) | (1 << (p + 2)))
#define GPIO_RW_MASK_ADDR(base, offset, mask) \
(GPIO_REG_ADDR(base, offset) | (mask << 2))
enum gpio_regs {
GPIO_DATA_OFFSET = 0x000,
GPIO_DIR_OFFSET = 0x400,
GPIO_DEN_OFFSET = 0x51C,
GPIO_IS_OFFSET = 0x404,
GPIO_IBE_OFFSET = 0x408,
GPIO_IEV_OFFSET = 0x40C,
GPIO_IM_OFFSET = 0x410,
GPIO_MIS_OFFSET = 0x418,
GPIO_ICR_OFFSET = 0x41C,
};
static void gpio_stellaris_isr(const struct device *dev)
{
const struct gpio_stellaris_config * const cfg = dev->config;
struct gpio_stellaris_runtime *context = dev->data;
uint32_t base = cfg->base;
uint32_t int_stat = sys_read32(GPIO_REG_ADDR(base, GPIO_MIS_OFFSET));
gpio_fire_callbacks(&context->cb, dev, int_stat);
sys_write32(int_stat, GPIO_REG_ADDR(base, GPIO_ICR_OFFSET));
}
static int gpio_stellaris_configure(const struct device *dev,
gpio_pin_t pin, gpio_flags_t flags)
{
const struct gpio_stellaris_config *cfg = dev->config;
uint32_t base = cfg->base;
uint32_t port_map = cfg->port_map;
if ((flags & (GPIO_PULL_UP | GPIO_PULL_DOWN)) != 0) {
return -ENOTSUP;
}
if ((flags & GPIO_SINGLE_ENDED) != 0) {
return -ENOTSUP;
}
/* Check for pin availability */
if (!sys_test_bit((uint32_t)&port_map, pin)) {
return -EINVAL;
}
if ((flags & GPIO_OUTPUT) != 0) {
mm_reg_t mask_addr;
mask_addr = GPIO_RW_MASK_ADDR(base, GPIO_DATA_OFFSET, BIT(pin));
if ((flags & GPIO_OUTPUT_INIT_HIGH) != 0) {
sys_write32(BIT(pin), mask_addr);
} else if ((flags & GPIO_OUTPUT_INIT_LOW) != 0) {
sys_write32(0, mask_addr);
}
sys_set_bit(GPIO_REG_ADDR(base, GPIO_DIR_OFFSET), pin);
/* Pin digital enable */
sys_set_bit(GPIO_REG_ADDR(base, GPIO_DEN_OFFSET), pin);
} else if ((flags & GPIO_INPUT) != 0) {
sys_clear_bit(GPIO_REG_ADDR(base, GPIO_DIR_OFFSET), pin);
/* Pin digital enable */
sys_set_bit(GPIO_REG_ADDR(base, GPIO_DEN_OFFSET), pin);
} else {
/* Pin digital disable */
sys_clear_bit(GPIO_REG_ADDR(base, GPIO_DEN_OFFSET), pin);
}
return 0;
}
static int gpio_stellaris_port_get_raw(const struct device *dev,
uint32_t *value)
{
const struct gpio_stellaris_config *cfg = dev->config;
uint32_t base = cfg->base;
*value = sys_read32(GPIO_RW_MASK_ADDR(base, GPIO_DATA_OFFSET, 0xff));
return 0;
}
static int gpio_stellaris_port_set_masked_raw(const struct device *dev,
uint32_t mask,
uint32_t value)
{
const struct gpio_stellaris_config *cfg = dev->config;
uint32_t base = cfg->base;
sys_write32(value, GPIO_RW_MASK_ADDR(base, GPIO_DATA_OFFSET, mask));
return 0;
}
static int gpio_stellaris_port_set_bits_raw(const struct device *dev,
uint32_t mask)
{
const struct gpio_stellaris_config *cfg = dev->config;
uint32_t base = cfg->base;
sys_write32(mask, GPIO_RW_MASK_ADDR(base, GPIO_DATA_OFFSET, mask));
return 0;
}
static int gpio_stellaris_port_clear_bits_raw(const struct device *dev,
uint32_t mask)
{
const struct gpio_stellaris_config *cfg = dev->config;
uint32_t base = cfg->base;
sys_write32(0, GPIO_RW_MASK_ADDR(base, GPIO_DATA_OFFSET, mask));
return 0;
}
static int gpio_stellaris_port_toggle_bits(const struct device *dev,
uint32_t mask)
{
const struct gpio_stellaris_config *cfg = dev->config;
uint32_t base = cfg->base;
uint32_t value;
value = sys_read32(GPIO_RW_MASK_ADDR(base, GPIO_DATA_OFFSET, 0xff));
value ^= mask;
sys_write32(value, GPIO_RW_MASK_ADDR(base, GPIO_DATA_OFFSET, 0xff));
return 0;
}
static int gpio_stellaris_pin_interrupt_configure(const struct device *dev,
gpio_pin_t pin,
enum gpio_int_mode mode,
enum gpio_int_trig trig)
{
const struct gpio_stellaris_config *cfg = dev->config;
uint32_t base = cfg->base;
/* Check if GPIO port needs interrupt support */
if (mode == GPIO_INT_MODE_DISABLED) {
/* Set the mask to disable the interrupt */
sys_set_bit(GPIO_REG_ADDR(base, GPIO_IM_OFFSET), pin);
} else {
if (mode == GPIO_INT_MODE_EDGE) {
sys_clear_bit(GPIO_REG_ADDR(base, GPIO_IS_OFFSET), pin);
} else {
sys_set_bit(GPIO_REG_ADDR(base, GPIO_IS_OFFSET), pin);
}
if (trig == GPIO_INT_TRIG_BOTH) {
sys_set_bit(GPIO_REG_ADDR(base, GPIO_IBE_OFFSET), pin);
} else if (trig == GPIO_INT_TRIG_HIGH) {
sys_set_bit(GPIO_REG_ADDR(base, GPIO_IEV_OFFSET), pin);
} else {
sys_clear_bit(GPIO_REG_ADDR(base,
GPIO_IEV_OFFSET), pin);
}
/* Clear the Mask to enable the interrupt */
sys_clear_bit(GPIO_REG_ADDR(base, GPIO_IM_OFFSET), pin);
}
return 0;
}
static int gpio_stellaris_init(const struct device *dev)
{
const struct gpio_stellaris_config *cfg = dev->config;
cfg->config_func(dev);
return 0;
}
static int gpio_stellaris_manage_callback(const struct device *dev,
struct gpio_callback *callback,
bool set)
{
struct gpio_stellaris_runtime *context = dev->data;
gpio_manage_callback(&context->cb, callback, set);
return 0;
}
static const struct gpio_driver_api gpio_stellaris_driver_api = {
.pin_configure = gpio_stellaris_configure,
.port_get_raw = gpio_stellaris_port_get_raw,
.port_set_masked_raw = gpio_stellaris_port_set_masked_raw,
.port_set_bits_raw = gpio_stellaris_port_set_bits_raw,
.port_clear_bits_raw = gpio_stellaris_port_clear_bits_raw,
.port_toggle_bits = gpio_stellaris_port_toggle_bits,
.pin_interrupt_configure = gpio_stellaris_pin_interrupt_configure,
.manage_callback = gpio_stellaris_manage_callback,
};
#define STELLARIS_GPIO_DEVICE(n) \
static void port_## n ##_stellaris_config_func(const struct device *dev); \
\
static struct gpio_stellaris_runtime port_## n ##_stellaris_runtime; \
\
static const struct gpio_stellaris_config gpio_stellaris_port_## n ##_config = {\
.common = { \
.port_pin_mask = GPIO_PORT_PIN_MASK_FROM_DT_INST(n), \
}, \
.base = DT_INST_REG_ADDR(n), \
.port_map = BIT_MASK(DT_INST_PROP(n, ngpios)), \
.config_func = port_## n ##_stellaris_config_func, \
}; \
\
DEVICE_DT_INST_DEFINE(n, \
gpio_stellaris_init, \
NULL, \
&port_## n ##_stellaris_runtime, \
&gpio_stellaris_port_## n ##_config, \
POST_KERNEL, CONFIG_GPIO_INIT_PRIORITY, \
&gpio_stellaris_driver_api); \
\
static void port_## n ##_stellaris_config_func(const struct device *dev) \
{ \
IRQ_CONNECT(DT_INST_IRQN(n), \
DT_INST_IRQ(n, priority), \
gpio_stellaris_isr, \
DEVICE_DT_INST_GET(n), 0); \
\
irq_enable(DT_INST_IRQN(n)); \
}
DT_INST_FOREACH_STATUS_OKAY(STELLARIS_GPIO_DEVICE)