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zephyr/drivers/gpio/gpio_lpc11u6x.c

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/*
* Copyright (c) 2020 Seagate Technology LLC
*
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT nxp_lpc11u6x_gpio
/**
* @file
* @brief GPIO driver for NXP LPC11U6X SoCs
*
* This driver allows to configure the GPIOs found on the LPC11U6x MCUs.
*
* @note See the UM10732 LPC11U6x/E6x user manual for register definitions.
*/
#include <drivers/clock_control.h>
#include <drivers/gpio.h>
#include <drivers/pinmux.h>
#include <dt-bindings/pinctrl/lpc11u6x-pinctrl.h>
#include "gpio_utils.h"
/* Offset from syscon base address. */
#define LPC11U6X_PINTSEL_REGS 0x178
/* Offsets from GPIO base address. */
#define LPC11U6X_GPIO_REGS 0x2000
#define LPC11U6X_PINT_REGS 0x4000
/**
* @brief Structure mapping the GPIO registers.
*
* @note The byte and word pin registers are not included because they are
* not used by this driver. A 0x2000 offset is applied to skip them.
*/
struct lpc11u6x_gpio_regs {
volatile uint32_t dir[3];
volatile uint32_t _unused1[29];
volatile uint32_t mask[3];
volatile uint32_t _unused2[29];
volatile uint32_t pin[3];
volatile uint32_t _unused3[29];
volatile uint32_t mpin[3];
volatile uint32_t _unused4[29];
volatile uint32_t set[3];
volatile uint32_t _unused5[29];
volatile uint32_t clr[3];
volatile uint32_t _unused6[29];
volatile uint32_t not[3];
};
/**
* @brief Structure mapping the PINT registers.
*/
struct lpc11u6x_pint_regs {
volatile uint32_t isel;
volatile uint32_t ienr;
volatile uint32_t sienr;
volatile uint32_t cienr;
volatile uint32_t ienf;
volatile uint32_t sienf;
volatile uint32_t cienf;
volatile uint32_t rise;
volatile uint32_t fall;
volatile uint32_t ist;
volatile uint32_t pmctrl;
volatile uint32_t pmsrc;
volatile uint32_t pmcfg;
};
/**
* @brief Structure for resources and information shared between GPIO ports.
*
* This structure is included by all the per-port private configuration.
* It gathers all the resources and information shared between all the GPIO
* ports: GPIO and SYSCON registers base addresses, clock name and subsystem.
*/
struct gpio_lpc11u6x_shared {
char *clock_controller_name;
clock_control_subsys_t clock_subsys;
uint32_t gpio_base;
uint32_t syscon_base;
uint8_t nirqs;
};
struct gpio_lpc11u6x_config {
/* gpio_driver_config needs to be first */
struct gpio_driver_config common;
const struct gpio_lpc11u6x_shared *shared;
char *pinmux_name;
uint8_t port_num;
uint8_t ngpios;
};
struct gpio_lpc11u6x_data {
/* gpio_driver_data needs to be first. */
struct gpio_driver_data common;
const struct device *pinmux_dev;
sys_slist_t cb_list;
};
static int gpio_lpc11u6x_pin_configure(const struct device *port,
gpio_pin_t pin, gpio_flags_t flags)
{
const struct gpio_lpc11u6x_config *config = port->config;
struct gpio_lpc11u6x_data *data = port->data;
struct lpc11u6x_gpio_regs *gpio_regs = (struct lpc11u6x_gpio_regs *)
(config->shared->gpio_base + LPC11U6X_GPIO_REGS);
uint8_t port_num = config->port_num;
uint32_t func;
int ret;
if (pin >= config->ngpios) {
return -EINVAL;
}
/*
* PIO0_4 and PIO0_5 are "true" open drain pins muxed with the I2C port
* 0. They still can be configured as GPIOs but only in open drain mode
* and with no pull-down or pull-up resitor enabled.
*/
if (port_num == 0 && (pin == 4 || pin == 5) &&
((flags & GPIO_OPEN_DRAIN) == 0 ||
(flags & (GPIO_PULL_UP | GPIO_PULL_DOWN)))) {
return -EINVAL;
}
/*
* For PIO0_0 and PIO0_[10-15] function 1 enables GPIO mode. For all
* the other pins, function 0 must be selected.
*/
if (port_num == 0 && (pin == 0 || (pin >= 10 && pin <= 15))) {
func = IOCON_FUNC1;
} else {
func = IOCON_FUNC0;
}
if (flags & GPIO_SINGLE_ENDED) {
/* Open source mode is not supported. */
if (flags & GPIO_LINE_OPEN_DRAIN)
func |= IOCON_OPENDRAIN_EN;
else
return -ENOTSUP;
}
if (flags & GPIO_PULL_UP) {
func |= IOCON_MODE_PULLUP;
} else if (flags & GPIO_PULL_DOWN) {
func |= IOCON_MODE_PULLDOWN;
} else {
func |= IOCON_MODE_INACT;
}
ret = pinmux_pin_set(data->pinmux_dev, pin, func);
if (ret < 0) {
return ret;
}
/* Initial output value. */
if (flags & GPIO_OUTPUT_INIT_HIGH) {
gpio_regs->set[port_num] |= BIT(pin);
}
if (flags & GPIO_OUTPUT_INIT_LOW) {
gpio_regs->clr[port_num] |= BIT(pin);
}
/*
* TODO: maybe configure the STARTERP0 register to allow wake-up from
* deep-sleep or power-down modes.
*/
/* Configure GPIO direction. */
WRITE_BIT(gpio_regs->dir[port_num], pin, flags & GPIO_OUTPUT);
return 0;
}
static int gpio_lpc11u6x_port_get_raw(const struct device *port,
gpio_port_value_t *value)
{
const struct gpio_lpc11u6x_config *config = port->config;
struct lpc11u6x_gpio_regs *gpio_regs = (struct lpc11u6x_gpio_regs *)
(config->shared->gpio_base + LPC11U6X_GPIO_REGS);
*value = gpio_regs->pin[config->port_num];
return 0;
}
static int gpio_lpc11u6x_port_set_masked_raw(const struct device *port,
gpio_port_pins_t mask,
gpio_port_value_t value)
{
const struct gpio_lpc11u6x_config *config = port->config;
struct lpc11u6x_gpio_regs *gpio_regs = (struct lpc11u6x_gpio_regs *)
(config->shared->gpio_base + LPC11U6X_GPIO_REGS);
uint8_t port_num = config->port_num;
uint32_t orig_mask;
orig_mask = gpio_regs->mask[port_num];
/* Apply inverted mask (bit set to 1 masks the pin). */
gpio_regs->mask[port_num] = ~mask;
compiler_barrier();
/* Update pins values. */
gpio_regs->mpin[port_num] = value;
compiler_barrier();
/* Restore original mask. */
gpio_regs->mask[port_num] = orig_mask;
compiler_barrier();
return 0;
}
static int gpio_lpc11u6x_port_set_bits_raw(const struct device *port,
gpio_port_pins_t pins)
{
const struct gpio_lpc11u6x_config *config = port->config;
struct lpc11u6x_gpio_regs *gpio_regs = (struct lpc11u6x_gpio_regs *)
(config->shared->gpio_base + LPC11U6X_GPIO_REGS);
gpio_regs->set[config->port_num] = pins;
return 0;
}
static int gpio_lpc11u6x_port_clear_bits_raw(const struct device *port,
gpio_port_pins_t pins)
{
const struct gpio_lpc11u6x_config *config = port->config;
struct lpc11u6x_gpio_regs *gpio_regs = (struct lpc11u6x_gpio_regs *)
(config->shared->gpio_base + LPC11U6X_GPIO_REGS);
gpio_regs->clr[config->port_num] = pins;
return 0;
}
static int gpio_lpc11u6x_port_toggle_bits(const struct device *port,
gpio_port_pins_t pins)
{
const struct gpio_lpc11u6x_config *config = port->config;
struct lpc11u6x_gpio_regs *gpio_regs = (struct lpc11u6x_gpio_regs *)
(config->shared->gpio_base + LPC11U6X_GPIO_REGS);
gpio_regs->not[config->port_num] = pins;
return 0;
}
/**
* @brief Attach a free interrupt line to a GPIO.
*
* @param shared Pointer to a structure shared between all the GPIO ports.
* @param intpin GPIO port and pin numbers encoded into a value compatible
* with the INTPIN register (included in the PINTSEL register).
*
* @retval >0 Number of the attached interrupt on success.
* @retval -EBUSY All the interrupt lines are already attached.
*/
static int
pintsel_attach(const struct gpio_lpc11u6x_shared *shared, uint8_t intpin)
{
uint8_t irq;
int ret = -EBUSY;
uint32_t *pintsel_reg =
(uint32_t *) (shared->syscon_base + LPC11U6X_PINTSEL_REGS);
for (irq = 0; irq < shared->nirqs; irq++) {
/* GPIO already attached. */
if ((pintsel_reg[irq] & BIT_MASK(5)) == intpin) {
return irq;
}
if (ret < 0 && (pintsel_reg[irq] & BIT_MASK(5)) == 0) {
ret = irq;
}
}
/* Attach GPIO to the first free interrupt found if any. */
if (ret >= 0) {
pintsel_reg[ret] = intpin;
}
return ret;
}
/**
* @brief Detach an interrupt line from a GPIO.
*
* @param shared Pointer to a structure shared between all the GPIO ports.
* @param intpin GPIO port and pin numbers encoded into a value compatible
* with the INTPIN register (included in the PINTSEL register).
*
* @retval >0 Number of the detached interrupt on success.
* @retval -EINVAL No attached interrupt found for the requested GPIO.
*/
static int
pintsel_detach(const struct gpio_lpc11u6x_shared *shared, uint8_t intpin)
{
uint8_t irq;
uint32_t *pintsel_reg =
(uint32_t *) (shared->syscon_base + LPC11U6X_PINTSEL_REGS);
for (irq = 0; irq < shared->nirqs; irq++) {
if ((pintsel_reg[irq] & BIT_MASK(5)) == intpin) {
pintsel_reg[irq] = 0;
return irq;
}
}
return -EINVAL;
}
static int gpio_lpc11u6x_pin_interrupt_configure(const struct device *port,
gpio_pin_t pin,
enum gpio_int_mode mode,
enum gpio_int_trig trig)
{
const struct gpio_lpc11u6x_config *config = port->config;
struct lpc11u6x_pint_regs *pint_regs = (struct lpc11u6x_pint_regs *)
(config->shared->gpio_base + LPC11U6X_PINT_REGS);
uint8_t intpin;
int irq;
if (pin >= config->ngpios) {
return -EINVAL;
}
/*
* Because the PINTSEL register only have 6 bits to encode a pin
* number, then PIO2_8 to PIO2_23 can't be attacehd to an interrupt
* line.
*/
if (config->port_num == 2 && pin > 7) {
return -ENOTSUP;
}
/*
* Convert the requested GPIO port and pin numbers into a value
* compatible with the INTPIN register (included in the PINTSEL
* register).
*/
intpin = pin;
if (config->port_num == 1) {
intpin += 24;
} else if (config->port_num == 2) {
intpin += 56;
}
if (mode == GPIO_INT_MODE_DISABLED) {
irq = pintsel_detach(config->shared, intpin);
} else {
irq = pintsel_attach(config->shared, intpin);
}
if (irq < 0) {
return irq;
}
switch (mode) {
case GPIO_INT_MODE_DISABLED:
pint_regs->isel &= ~BIT(irq);
pint_regs->cienr |= BIT(irq);
pint_regs->cienf |= BIT(irq);
break;
case GPIO_INT_MODE_EDGE:
/* Select edge interrupt mode. */
pint_regs->isel &= ~BIT(irq);
/* Enable interrupts on falling and/or rising edges. */
if (trig & GPIO_INT_TRIG_LOW)
pint_regs->sienf |= BIT(irq);
else
pint_regs->cienf |= BIT(irq);
if (trig & GPIO_INT_TRIG_HIGH)
pint_regs->sienr |= BIT(irq);
else
pint_regs->cienr |= BIT(irq);
break;
case GPIO_INT_MODE_LEVEL:
/* Select level interrupt mode. */
pint_regs->isel |= BIT(irq);
/* Set active level. */
if (trig & GPIO_INT_TRIG_LOW)
pint_regs->cienf |= BIT(irq);
else
pint_regs->sienf |= BIT(irq);
/* Enable level interrupt. */
pint_regs->sienr |= BIT(irq);
break;
default:
return -ENOTSUP;
}
/* Clear interrupt status. */
pint_regs->ist |= BIT(irq);
return 0;
}
static int gpio_lpc11u6x_manage_callback(const struct device *port,
struct gpio_callback *cb, bool set)
{
struct gpio_lpc11u6x_data *data = port->data;
return gpio_manage_callback(&data->cb_list, cb, set);
}
static uint32_t gpio_lpc11u6x_get_pending_int(const struct device *dev)
{
ARG_UNUSED(dev);
return -ENOTSUP;
}
static void gpio_lpc11u6x_isr(const void *arg)
{
struct gpio_lpc11u6x_shared *shared =
(struct gpio_lpc11u6x_shared *)arg;
struct lpc11u6x_pint_regs *pint_regs = (struct lpc11u6x_pint_regs *)
(shared->gpio_base + LPC11U6X_PINT_REGS);
uint32_t *pintsel_reg =
(uint32_t *) (shared->syscon_base + LPC11U6X_PINTSEL_REGS);
uint8_t irq;
uint32_t pins[3] = { 0, 0, 0 };
const struct device *port;
struct gpio_lpc11u6x_data *data;
for (irq = 0; irq < shared->nirqs; irq++) {
uint32_t intpin;
if ((pint_regs->ist & BIT(irq)) == 0) {
continue;
}
/* Clear interrupt status. */
pint_regs->ist |= BIT(irq);
/*
* Look in the PINTSEL register to retrieve the "intpin" value
* attached with the requested interrupt. Extract the GPIO
* port and pin numbers from this "intpin" value and store them
* into an "active pins" mask.
*/
intpin = pintsel_reg[irq] & BIT_MASK(5);
if (intpin < 24) {
pins[0] |= BIT(intpin);
} else if (intpin < 56) {
pins[1] |= BIT(intpin - 24);
} else {
pins[2] |= BIT(intpin - 56);
}
}
/* For each port with active pins, fire the GPIO interrupt callbacks. */
#if DT_NODE_HAS_STATUS(DT_NODELABEL(gpio0), okay)
if (pins[0]) {
port = DEVICE_DT_GET(DT_NODELABEL(gpio0));
data = port->data;
gpio_fire_callbacks(&data->cb_list, port, pins[0]);
}
#endif
#if DT_NODE_HAS_STATUS(DT_NODELABEL(gpio1), okay)
if (pins[1]) {
port = DEVICE_DT_GET(DT_NODELABEL(gpio1));
data = port->data;
gpio_fire_callbacks(&data->cb_list, port, pins[1]);
}
#endif
#if DT_NODE_HAS_STATUS(DT_NODELABEL(gpio2), okay)
if (pins[2]) {
port = DEVICE_DT_GET(DT_NODELABEL(gpio2));
data = port->data;
gpio_fire_callbacks(&data->cb_list, port, pins[2]);
}
#endif
}
static const struct gpio_driver_api gpio_lpc11u6x_driver_api = {
.pin_configure = gpio_lpc11u6x_pin_configure,
.port_get_raw = gpio_lpc11u6x_port_get_raw,
.port_set_masked_raw = gpio_lpc11u6x_port_set_masked_raw,
.port_set_bits_raw = gpio_lpc11u6x_port_set_bits_raw,
.port_clear_bits_raw = gpio_lpc11u6x_port_clear_bits_raw,
.port_toggle_bits = gpio_lpc11u6x_port_toggle_bits,
.pin_interrupt_configure = gpio_lpc11u6x_pin_interrupt_configure,
.manage_callback = gpio_lpc11u6x_manage_callback,
.get_pending_int = gpio_lpc11u6x_get_pending_int,
};
/*
* Note that the first DT instance is used to initialize the resources
* shared between all the ports (IRQ lines, clock).
*/
static const struct gpio_lpc11u6x_shared gpio_lpc11u6x_shared = {
.clock_controller_name = DT_LABEL(DT_INST_PHANDLE(0, clocks)),
.clock_subsys = (clock_control_subsys_t) DT_INST_PHA(0, clocks, clkid),
.gpio_base = DT_INST_REG_ADDR_BY_IDX(0, 0),
.syscon_base = DT_INST_REG_ADDR_BY_IDX(0, 1),
.nirqs = DT_NUM_IRQS(DT_DRV_INST(0)),
};
#define IRQ_INIT(n) \
do { \
IRQ_CONNECT(DT_INST_IRQ_BY_IDX(0, n, irq), \
DT_INST_IRQ_BY_IDX(0, n, priority), \
gpio_lpc11u6x_isr, &gpio_lpc11u6x_shared, 0); \
irq_enable(DT_INST_IRQ_BY_IDX(0, n, irq)); \
} while (0)
static int gpio_lpc11u6x_init(const struct device *dev)
{
const struct gpio_lpc11u6x_config *config = dev->config;
struct gpio_lpc11u6x_data *data = dev->data;
const struct device *clock_dev;
int ret;
static bool gpio_ready;
/* Retrieve pinmux device. */
data->pinmux_dev = device_get_binding(config->pinmux_name);
if (!data->pinmux_dev) {
return -EINVAL;
}
/* Initialize shared resources only once. */
if (gpio_ready) {
return 0;
}
/* Enable GPIO and PINT clocks. */
clock_dev = device_get_binding(config->shared->clock_controller_name);
if (!clock_dev) {
return -ENODEV;
}
ret = clock_control_on(clock_dev, config->shared->clock_subsys);
if (ret < 0) {
return ret;
}
#if DT_INST_IRQ_HAS_IDX(0, 0)
IRQ_INIT(0);
#endif
#if DT_INST_IRQ_HAS_IDX(0, 1)
IRQ_INIT(1);
#endif
#if DT_INST_IRQ_HAS_IDX(0, 2)
IRQ_INIT(2);
#endif
#if DT_INST_IRQ_HAS_IDX(0, 3)
IRQ_INIT(3);
#endif
#if DT_INST_IRQ_HAS_IDX(0, 4)
IRQ_INIT(4);
#endif
#if DT_INST_IRQ_HAS_IDX(0, 5)
IRQ_INIT(5);
#endif
#if DT_INST_IRQ_HAS_IDX(0, 6)
IRQ_INIT(6);
#endif
#if DT_INST_IRQ_HAS_IDX(0, 7)
IRQ_INIT(7);
#endif
gpio_ready = true;
return 0;
}
#define GPIO_LPC11U6X_INIT(id) \
static const struct gpio_lpc11u6x_config \
gpio_lpc11u6x_config_##id = { \
.common = { \
.port_pin_mask = GPIO_PORT_PIN_MASK_FROM_DT_NODE( \
DT_NODELABEL(gpio##id)), \
}, \
.shared = &gpio_lpc11u6x_shared, \
.port_num = id, \
.pinmux_name = DT_LABEL(DT_PHANDLE(DT_NODELABEL(gpio##id), \
pinmux_port)), \
.ngpios = DT_PROP(DT_NODELABEL(gpio##id), ngpios), \
}; \
\
static struct gpio_lpc11u6x_data gpio_lpc11u6x_data_##id; \
\
DEVICE_DT_DEFINE(DT_NODELABEL(gpio##id), \
&gpio_lpc11u6x_init, \
NULL, \
&gpio_lpc11u6x_data_##id, \
&gpio_lpc11u6x_config_##id, \
PRE_KERNEL_2, CONFIG_GPIO_INIT_PRIORITY, \
&gpio_lpc11u6x_driver_api)
#if DT_NODE_HAS_STATUS(DT_NODELABEL(gpio0), okay)
GPIO_LPC11U6X_INIT(0);
#endif
#if DT_NODE_HAS_STATUS(DT_NODELABEL(gpio1), okay)
GPIO_LPC11U6X_INIT(1);
#endif
#if DT_NODE_HAS_STATUS(DT_NODELABEL(gpio2), okay)
GPIO_LPC11U6X_INIT(2);
#endif
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