blob: 76b899e4e901491c162e9741e1b3f7c7996da964 [file] [log] [blame]
/*
* Copyright (c) 2015 Intel Corporation.
*
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT snps_designware_gpio
#include <errno.h>
#include <zephyr/kernel.h>
#include <zephyr/drivers/gpio.h>
#include <zephyr/dt-bindings/gpio/snps-designware-gpio.h>
#include "gpio_dw.h"
#include "gpio_utils.h"
#include <zephyr/pm/device.h>
#include <zephyr/sys/sys_io.h>
#include <zephyr/init.h>
#include <zephyr/sys/util.h>
#include <zephyr/sys/__assert.h>
#include <zephyr/drivers/clock_control.h>
#ifdef CONFIG_IOAPIC
#include <zephyr/drivers/interrupt_controller/ioapic.h>
#endif
static int gpio_dw_port_set_bits_raw(const struct device *port, uint32_t mask);
static int gpio_dw_port_clear_bits_raw(const struct device *port,
uint32_t mask);
/*
* ARC architecture configure IP through IO auxiliary registers.
* Other architectures as ARM and x86 configure IP through MMIO registers
*/
#ifdef GPIO_DW_IO_ACCESS
static inline uint32_t dw_read(uint32_t base_addr, uint32_t offset)
{
return sys_in32(base_addr + offset);
}
static inline void dw_write(uint32_t base_addr, uint32_t offset,
uint32_t val)
{
sys_out32(val, base_addr + offset);
}
static void dw_set_bit(uint32_t base_addr, uint32_t offset,
uint32_t bit, bool value)
{
if (!value) {
sys_io_clear_bit(base_addr + offset, bit);
} else {
sys_io_set_bit(base_addr + offset, bit);
}
}
#else
static inline uint32_t dw_read(uint32_t base_addr, uint32_t offset)
{
return sys_read32(base_addr + offset);
}
static inline void dw_write(uint32_t base_addr, uint32_t offset,
uint32_t val)
{
sys_write32(val, base_addr + offset);
}
static void dw_set_bit(uint32_t base_addr, uint32_t offset,
uint32_t bit, bool value)
{
if (!value) {
sys_clear_bit(base_addr + offset, bit);
} else {
sys_set_bit(base_addr + offset, bit);
}
}
#endif
static inline int dw_base_to_block_base(uint32_t base_addr)
{
return (base_addr & 0xFFFFFFC0);
}
static inline int dw_derive_port_from_base(uint32_t base_addr)
{
uint32_t port = (base_addr & 0x3f) / 12U;
return port;
}
static inline int dw_interrupt_support(const struct gpio_dw_config *config)
{
return ((int)(config->irq_num) > 0U);
}
static inline uint32_t dw_get_ext_port(uint32_t base_addr)
{
uint32_t ext_port;
/* 4-port GPIO implementation translates from base address to port */
switch (dw_derive_port_from_base(base_addr)) {
case 1:
ext_port = EXT_PORTB;
break;
case 2:
ext_port = EXT_PORTC;
break;
case 3:
ext_port = EXT_PORTD;
break;
case 0:
default:
ext_port = EXT_PORTA;
break;
}
return ext_port;
}
static inline uint32_t dw_get_data_port(uint32_t base_addr)
{
uint32_t dr_port;
/* 4-port GPIO implementation translates from base address to port */
switch (dw_derive_port_from_base(base_addr)) {
case 1:
dr_port = SWPORTB_DR;
break;
case 2:
dr_port = SWPORTC_DR;
break;
case 3:
dr_port = SWPORTD_DR;
break;
case 0:
default:
dr_port = SWPORTA_DR;
break;
}
return dr_port;
}
static inline uint32_t dw_get_dir_port(uint32_t base_addr)
{
uint32_t ddr_port;
/* 4-port GPIO implementation translates from base address to port */
switch (dw_derive_port_from_base(base_addr)) {
case 1:
ddr_port = SWPORTB_DDR;
break;
case 2:
ddr_port = SWPORTC_DDR;
break;
case 3:
ddr_port = SWPORTD_DDR;
break;
case 0:
default:
ddr_port = SWPORTA_DDR;
break;
}
return ddr_port;
}
static int gpio_dw_pin_interrupt_configure(const struct device *port,
gpio_pin_t pin,
enum gpio_int_mode mode,
enum gpio_int_trig trig)
{
struct gpio_dw_runtime *context = port->data;
const struct gpio_dw_config *config = port->config;
uint32_t base_addr = dw_base_to_block_base(context->base_addr);
uint32_t port_base_addr = context->base_addr;
uint32_t dir_port = dw_get_dir_port(port_base_addr);
uint32_t data_port = dw_get_data_port(port_base_addr);
uint32_t dir_reg;
/* Check for invalid pin number */
if (pin >= config->ngpios) {
return -EINVAL;
}
/* Only PORT-A supports interrupts */
if (data_port != SWPORTA_DR) {
return -ENOTSUP;
}
if (mode != GPIO_INT_MODE_DISABLED) {
/* Check if GPIO port supports interrupts */
if (!dw_interrupt_support(config)) {
return -ENOTSUP;
}
/* Interrupt to be enabled but pin is not set to input */
dir_reg = dw_read(port_base_addr, dir_port) & BIT(pin);
if (dir_reg != 0U) {
return -EINVAL;
}
}
/* Does not support both edges */
if ((mode == GPIO_INT_MODE_EDGE) &&
(trig == GPIO_INT_TRIG_BOTH)) {
return -ENOTSUP;
}
/* Clear interrupt enable */
dw_set_bit(base_addr, INTEN, pin, false);
/* Mask and clear interrupt */
dw_set_bit(base_addr, INTMASK, pin, true);
dw_write(base_addr, PORTA_EOI, BIT(pin));
if (mode != GPIO_INT_MODE_DISABLED) {
/* level (0) or edge (1) */
dw_set_bit(base_addr, INTTYPE_LEVEL, pin,
(mode == GPIO_INT_MODE_EDGE));
/* Active low/high */
dw_set_bit(base_addr, INT_POLARITY, pin,
(trig == GPIO_INT_TRIG_HIGH));
/* Finally enabling interrupt */
dw_set_bit(base_addr, INTEN, pin, true);
dw_set_bit(base_addr, INTMASK, pin, false);
}
return 0;
}
static inline void dw_pin_config(const struct device *port,
uint32_t pin, int flags)
{
struct gpio_dw_runtime *context = port->data;
const struct gpio_dw_config *config = port->config;
uint32_t base_addr = dw_base_to_block_base(context->base_addr);
uint32_t port_base_addr = context->base_addr;
uint32_t dir_port = dw_get_dir_port(port_base_addr);
bool pin_is_output, need_debounce;
/* Set init value then direction */
pin_is_output = (flags & GPIO_OUTPUT) != 0U;
if (pin_is_output) {
if ((flags & GPIO_OUTPUT_INIT_HIGH) != 0U) {
gpio_dw_port_set_bits_raw(port, BIT(pin));
} else if ((flags & GPIO_OUTPUT_INIT_LOW) != 0U) {
gpio_dw_port_clear_bits_raw(port, BIT(pin));
}
}
dw_set_bit(port_base_addr, dir_port, pin, pin_is_output);
/* Use built-in debounce.
* Note debounce circuit is only available if also supporting
* interrupts according to datasheet.
*/
if (dw_interrupt_support(config) && (dir_port == SWPORTA_DDR)) {
need_debounce = (flags & DW_GPIO_DEBOUNCE);
dw_set_bit(base_addr, PORTA_DEBOUNCE, pin, need_debounce);
}
}
static inline int gpio_dw_config(const struct device *port,
gpio_pin_t pin,
gpio_flags_t flags)
{
const struct gpio_dw_config *config = port->config;
uint32_t io_flags;
/* Check for invalid pin number */
if (pin >= config->ngpios) {
return -EINVAL;
}
/* Does not support disconnected pin, and
* not supporting both input/output at same time.
*/
io_flags = flags & (GPIO_INPUT | GPIO_OUTPUT);
if ((io_flags == GPIO_DISCONNECTED)
|| (io_flags == (GPIO_INPUT | GPIO_OUTPUT))) {
return -ENOTSUP;
}
/* No open-drain support */
if ((flags & GPIO_SINGLE_ENDED) != 0U) {
return -ENOTSUP;
}
/* Does not support pull-up/pull-down */
if ((flags & (GPIO_PULL_UP | GPIO_PULL_DOWN)) != 0U) {
return -ENOTSUP;
}
dw_pin_config(port, pin, flags);
return 0;
}
static int gpio_dw_port_get_raw(const struct device *port, uint32_t *value)
{
struct gpio_dw_runtime *context = port->data;
uint32_t base_addr = dw_base_to_block_base(context->base_addr);
uint32_t port_base_addr = context->base_addr;
uint32_t ext_port = dw_get_ext_port(port_base_addr);
*value = dw_read(base_addr, ext_port);
return 0;
}
static int gpio_dw_port_set_masked_raw(const struct device *port,
uint32_t mask, uint32_t value)
{
struct gpio_dw_runtime *context = port->data;
uint32_t base_addr = dw_base_to_block_base(context->base_addr);
uint32_t port_base_addr = context->base_addr;
uint32_t data_port = dw_get_data_port(port_base_addr);
uint32_t pins;
pins = dw_read(base_addr, data_port);
pins = (pins & ~mask) | (mask & value);
dw_write(base_addr, data_port, pins);
return 0;
}
static int gpio_dw_port_set_bits_raw(const struct device *port, uint32_t mask)
{
struct gpio_dw_runtime *context = port->data;
uint32_t base_addr = dw_base_to_block_base(context->base_addr);
uint32_t port_base_addr = context->base_addr;
uint32_t data_port = dw_get_data_port(port_base_addr);
uint32_t pins;
pins = dw_read(base_addr, data_port);
pins |= mask;
dw_write(base_addr, data_port, pins);
return 0;
}
static int gpio_dw_port_clear_bits_raw(const struct device *port,
uint32_t mask)
{
struct gpio_dw_runtime *context = port->data;
uint32_t base_addr = dw_base_to_block_base(context->base_addr);
uint32_t port_base_addr = context->base_addr;
uint32_t data_port = dw_get_data_port(port_base_addr);
uint32_t pins;
pins = dw_read(base_addr, data_port);
pins &= ~mask;
dw_write(base_addr, data_port, pins);
return 0;
}
static int gpio_dw_port_toggle_bits(const struct device *port, uint32_t mask)
{
struct gpio_dw_runtime *context = port->data;
uint32_t base_addr = dw_base_to_block_base(context->base_addr);
uint32_t port_base_addr = context->base_addr;
uint32_t data_port = dw_get_data_port(port_base_addr);
uint32_t pins;
pins = dw_read(base_addr, data_port);
pins ^= mask;
dw_write(base_addr, data_port, pins);
return 0;
}
static inline int gpio_dw_manage_callback(const struct device *port,
struct gpio_callback *callback,
bool set)
{
struct gpio_dw_runtime *context = port->data;
return gpio_manage_callback(&context->callbacks, callback, set);
}
#define gpio_dw_unmask_int(...)
static void gpio_dw_isr(const struct device *port)
{
struct gpio_dw_runtime *context = port->data;
uint32_t base_addr = dw_base_to_block_base(context->base_addr);
uint32_t int_status;
int_status = dw_read(base_addr, INTSTATUS);
dw_write(base_addr, PORTA_EOI, int_status);
gpio_fire_callbacks(&context->callbacks, port, int_status);
}
static const struct gpio_driver_api api_funcs = {
.pin_configure = gpio_dw_config,
.port_get_raw = gpio_dw_port_get_raw,
.port_set_masked_raw = gpio_dw_port_set_masked_raw,
.port_set_bits_raw = gpio_dw_port_set_bits_raw,
.port_clear_bits_raw = gpio_dw_port_clear_bits_raw,
.port_toggle_bits = gpio_dw_port_toggle_bits,
.pin_interrupt_configure = gpio_dw_pin_interrupt_configure,
.manage_callback = gpio_dw_manage_callback,
};
static int gpio_dw_initialize(const struct device *port)
{
struct gpio_dw_runtime *context = port->data;
const struct gpio_dw_config *config = port->config;
uint32_t base_addr;
if (dw_interrupt_support(config)) {
base_addr = dw_base_to_block_base(context->base_addr);
/* interrupts in sync with system clock */
dw_set_bit(base_addr, INT_CLOCK_SYNC, LS_SYNC_POS, 1);
/* mask and disable interrupts */
dw_write(base_addr, INTMASK, ~(0));
dw_write(base_addr, INTEN, 0);
dw_write(base_addr, PORTA_EOI, ~(0));
config->config_func(port);
}
return 0;
}
/* Bindings to the platform */
#define INST_IRQ_FLAGS(n) \
COND_CODE_1(DT_INST_IRQ_HAS_CELL(n, flags), (DT_INST_IRQ(n, flags)), (0))
#define GPIO_CFG_IRQ(n) \
const struct gpio_dw_config *config = port->config; \
\
IRQ_CONNECT(DT_INST_IRQN(n), \
DT_INST_IRQ(n, priority), gpio_dw_isr, \
DEVICE_DT_INST_GET(n), INST_IRQ_FLAGS(n)); \
irq_enable(config->irq_num); \
gpio_dw_unmask_int(GPIO_DW_PORT_##n##_INT_MASK); \
#define GPIO_DW_INIT(n) \
static void gpio_config_##n##_irq(const struct device *port) \
{ \
IF_ENABLED(DT_INST_IRQ_HAS_IDX(n, 0), (GPIO_CFG_IRQ(n))) \
} \
\
static const struct gpio_dw_config gpio_dw_config_##n = { \
.common = { \
.port_pin_mask = GPIO_PORT_PIN_MASK_FROM_DT_INST(n), \
}, \
.irq_num = COND_CODE_1(DT_INST_IRQ_HAS_IDX(n, 0), (DT_INST_IRQN(n)), (0)), \
.ngpios = DT_INST_PROP(n, ngpios), \
.config_func = gpio_config_##n##_irq, \
}; \
\
static struct gpio_dw_runtime gpio_##n##_runtime = { \
.base_addr = DT_INST_REG_ADDR(n), \
}; \
\
DEVICE_DT_INST_DEFINE(n, gpio_dw_initialize, NULL, &gpio_##n##_runtime, \
&gpio_dw_config_##n, PRE_KERNEL_1, \
CONFIG_GPIO_INIT_PRIORITY, &api_funcs); \
DT_INST_FOREACH_STATUS_OKAY(GPIO_DW_INIT)