368 lines
9.9 KiB
C
368 lines
9.9 KiB
C
/*
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* Copyright (c) 2021 Andes Technology Corporation
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/**
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* @file GPIO driver for the AndesTech ATCGPIO100 controller
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*/
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#include <errno.h>
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#include <stdbool.h>
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#include <kernel.h>
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#include <device.h>
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#include <soc.h>
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#include <drivers/gpio.h>
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#include <dt-bindings/gpio/andestech-atcgpio100.h>
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#include <sys/util.h>
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#include <sys/sys_io.h>
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#include "gpio_utils.h"
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#define DT_DRV_COMPAT andestech_atcgpio100
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/* Andes ATCGPIO100 register definition */
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#define REG_IDR 0x00 /* ID and Revision reg. */
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#define REG_CFG 0x10 /* Hardware configure reg. */
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#define REG_DIN 0x20 /* Data In reg. */
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#define REG_DOUT 0x24 /* Data Out reg. */
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#define REG_DIR 0x28 /* Channel direction reg. */
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#define REG_DCLR 0x2C /* Data out clear reg. */
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#define REG_DSET 0x30 /* Data out set reg. */
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#define REG_PUEN 0x40 /* Pull enable reg. */
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#define REG_PTYP 0x44 /* Pull type reg. */
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#define REG_INTE 0x50 /* Interrupt enable reg. */
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#define REG_IMD0 0x54 /* Interrupt mode 0 ~ 7 reg. */
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#define REG_IMD1 0x58 /* Interrupt mode 8 ~ 15 reg. */
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#define REG_IMD2 0x5C /* Interrupt mode 16 ~ 23 reg. */
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#define REG_IMD3 0x60 /* Interrupt mode 24 ~ 31 reg. */
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#define REG_ISTA 0x64 /* Interrupt status reg. */
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#define REG_DEBE 0x70 /* De-bounce enable reg. */
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#define REG_DEBC 0x74 /* De-Bounce control reg. */
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#define INT_NO_OPERATION 0x0
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#define INT_HIGH_LEVEL 0x2
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#define INT_LOW_LEVEL 0x3
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#define INT_NEGATIVE_EDGE 0x5
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#define INT_POSITIVE_EDGE 0x6
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#define INT_DUAL_EDGE 0x7
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#define PULL_CONFIGURED BIT(31)
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#define DEBOUNCE_CONFIGURED BIT(29)
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#define DF_DEBOUNCED_SETTING (0x80000003)
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#define GPIO_BASE(dev) \
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((const struct gpio_atcgpio100_config * const)(dev)->config)->base
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#define GPIO_CFG(dev) (GPIO_BASE(dev) + REG_CFG)
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#define GPIO_DIR(dev) (GPIO_BASE(dev) + REG_DIR)
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#define GPIO_DIN(dev) (GPIO_BASE(dev) + REG_DIN)
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#define GPIO_DOUT(dev) (GPIO_BASE(dev) + REG_DOUT)
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#define GPIO_DCLR(dev) (GPIO_BASE(dev) + REG_DCLR)
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#define GPIO_DSET(dev) (GPIO_BASE(dev) + REG_DSET)
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#define GPIO_PUEN(dev) (GPIO_BASE(dev) + REG_PUEN)
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#define GPIO_PTYP(dev) (GPIO_BASE(dev) + REG_PTYP)
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#define GPIO_INTE(dev) (GPIO_BASE(dev) + REG_INTE)
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#define GPIO_IMD(dev, idx) (GPIO_BASE(dev) + REG_IMD0 + (idx * 4))
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#define GPIO_ISTA(dev) (GPIO_BASE(dev) + REG_ISTA)
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#define GPIO_DEBE(dev) (GPIO_BASE(dev) + REG_DEBE)
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#define GPIO_DEBC(dev) (GPIO_BASE(dev) + REG_DEBC)
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#define INWORD(x) sys_read32(x)
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#define OUTWORD(x, d) sys_write32(d, x)
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#define SET_GPIO_INT_MODE(cur_val, mode, ch_idx) \
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do { \
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cur_val &= ~(BIT_MASK(3) << (ch_idx * 4)); \
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cur_val |= (mode << (ch_idx * 4)); \
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} while (false)
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typedef void (*atcgpio100_cfg_func_t)(void);
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struct gpio_atcgpio100_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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uint32_t base;
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uint32_t irq_num;
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atcgpio100_cfg_func_t cfg_func;
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};
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struct gpio_atcgpio100_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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/* list of callbacks */
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sys_slist_t cb;
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struct k_spinlock lock;
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};
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static int gpio_atcgpio100_config(const struct device *port,
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gpio_pin_t pin,
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gpio_flags_t flags)
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{
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struct gpio_atcgpio100_data * const data = port->data;
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uint32_t port_value, pin_mask, io_flags;
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k_spinlock_key_t key;
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/* Does not support disconnected pin, and
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* not supporting both input/output at same time.
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*/
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io_flags = flags & (GPIO_INPUT | GPIO_OUTPUT);
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if ((io_flags == GPIO_DISCONNECTED)
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|| (io_flags == (GPIO_INPUT | GPIO_OUTPUT))) {
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return -ENOTSUP;
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}
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pin_mask = BIT(pin);
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if (flags & GPIO_OUTPUT) {
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if (flags & GPIO_OUTPUT_INIT_HIGH) {
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OUTWORD(GPIO_DSET(port), pin_mask);
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} else if (flags & GPIO_OUTPUT_INIT_LOW) {
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OUTWORD(GPIO_DCLR(port), pin_mask);
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}
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key = k_spin_lock(&data->lock);
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/* Set channel output */
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port_value = INWORD(GPIO_DIR(port));
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OUTWORD(GPIO_DIR(port), port_value | pin_mask);
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k_spin_unlock(&data->lock, key);
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} else if (flags & GPIO_INPUT) {
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if (flags & (GPIO_PULL_UP | GPIO_PULL_DOWN)) {
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return -ENOTSUP;
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}
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key = k_spin_lock(&data->lock);
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/* Set de-bounce */
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if (flags & ATCGPIO100_GPIO_DEBOUNCE) {
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/* Default settings: Filter out pulses which are
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* less than 4 de-bounce clock period
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*/
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OUTWORD(GPIO_DEBC(port), DF_DEBOUNCED_SETTING);
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port_value = INWORD(GPIO_DEBE(port));
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OUTWORD(GPIO_DEBE(port), port_value | pin_mask);
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}
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/* Set channel input */
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port_value = INWORD(GPIO_DIR(port));
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OUTWORD(GPIO_DIR(port), port_value & ~pin_mask);
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k_spin_unlock(&data->lock, key);
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} else {
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return -ENOTSUP;
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}
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return 0;
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}
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static int gpio_atcgpio100_port_get_raw(const struct device *port,
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gpio_port_value_t *value)
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{
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*value = INWORD(GPIO_DIN(port));
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return 0;
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}
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static int gpio_atcgpio100_set_masked_raw(const struct device *port,
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gpio_port_pins_t mask,
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gpio_port_value_t value)
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{
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struct gpio_atcgpio100_data * const data = port->data;
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uint32_t port_value;
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k_spinlock_key_t key = k_spin_lock(&data->lock);
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port_value = INWORD(GPIO_DOUT(port));
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OUTWORD(GPIO_DOUT(port), (port_value & ~mask) | (value & mask));
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k_spin_unlock(&data->lock, key);
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return 0;
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}
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static int gpio_atcgpio100_set_bits_raw(const struct device *port,
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gpio_port_pins_t pins)
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{
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OUTWORD(GPIO_DSET(port), pins);
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return 0;
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}
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static int gpio_atcgpio100_clear_bits_raw(const struct device *port,
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gpio_port_pins_t pins)
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{
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OUTWORD(GPIO_DCLR(port), pins);
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return 0;
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}
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static int gpio_atcgpio100_toggle_bits(const struct device *port,
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gpio_port_pins_t pins)
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{
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struct gpio_atcgpio100_data * const data = port->data;
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uint32_t port_value;
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k_spinlock_key_t key = k_spin_lock(&data->lock);
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port_value = INWORD(GPIO_DOUT(port));
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OUTWORD(GPIO_DOUT(port), port_value ^ pins);
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k_spin_unlock(&data->lock, key);
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return 0;
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}
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static int gpio_atcgpio100_pin_interrupt_configure(
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const struct device *port,
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gpio_pin_t pin,
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enum gpio_int_mode mode,
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enum gpio_int_trig trig)
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{
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struct gpio_atcgpio100_data * const data = port->data;
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uint32_t port_value, int_mode, imr_idx, ch_idx;
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k_spinlock_key_t key;
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switch (mode | trig) {
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case GPIO_INT_EDGE_BOTH:
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int_mode = INT_DUAL_EDGE;
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break;
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case GPIO_INT_EDGE_RISING:
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int_mode = INT_POSITIVE_EDGE;
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break;
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case GPIO_INT_EDGE_FALLING:
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int_mode = INT_NEGATIVE_EDGE;
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break;
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case GPIO_INT_LEVEL_LOW:
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int_mode = INT_LOW_LEVEL;
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break;
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case GPIO_INT_LEVEL_HIGH:
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int_mode = INT_HIGH_LEVEL;
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break;
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default:
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int_mode = INT_NO_OPERATION;
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break;
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}
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imr_idx = (pin / 8);
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ch_idx = (pin % 8);
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key = k_spin_lock(&data->lock);
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if (int_mode == INT_NO_OPERATION) {
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/* Disable interrupt of pin */
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port_value = INWORD(GPIO_INTE(port));
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OUTWORD(GPIO_INTE(port), port_value & ~BIT(pin));
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/* Clear the remain pending interrupt */
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port_value = INWORD(GPIO_ISTA(port));
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OUTWORD(GPIO_ISTA(port), port_value);
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} else {
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/* Set interrupt mode of pin */
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port_value = INWORD(GPIO_IMD(port, imr_idx));
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SET_GPIO_INT_MODE(port_value, int_mode, ch_idx);
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OUTWORD(GPIO_IMD(port, imr_idx), port_value);
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/* Enable interrupt of pin */
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port_value = INWORD(GPIO_INTE(port));
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OUTWORD(GPIO_INTE(port), port_value | BIT(pin));
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}
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k_spin_unlock(&data->lock, key);
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return 0;
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}
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static int gpio_atcgpio100_manage_callback(const struct device *port,
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struct gpio_callback *callback,
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bool set)
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{
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struct gpio_atcgpio100_data * const data = port->data;
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return gpio_manage_callback(&data->cb, callback, set);
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}
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static void gpio_atcgpio100_irq_handler(const struct device *port)
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{
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struct gpio_atcgpio100_data * const data = port->data;
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uint32_t port_value;
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port_value = INWORD(GPIO_ISTA(port));
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OUTWORD(GPIO_ISTA(port), port_value);
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gpio_fire_callbacks(&data->cb, port, port_value);
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}
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static const struct gpio_driver_api gpio_atcgpio100_api = {
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.pin_configure = gpio_atcgpio100_config,
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.port_get_raw = gpio_atcgpio100_port_get_raw,
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.port_set_masked_raw = gpio_atcgpio100_set_masked_raw,
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.port_set_bits_raw = gpio_atcgpio100_set_bits_raw,
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.port_clear_bits_raw = gpio_atcgpio100_clear_bits_raw,
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.port_toggle_bits = gpio_atcgpio100_toggle_bits,
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.pin_interrupt_configure = gpio_atcgpio100_pin_interrupt_configure,
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.manage_callback = gpio_atcgpio100_manage_callback
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};
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static int gpio_atcgpio100_init(const struct device *port)
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{
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const struct gpio_atcgpio100_config * const dev_cfg = port->config;
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/* Disable all interrupts */
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OUTWORD(GPIO_INTE(port), BIT_MASK(0));
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/* Write 1 to clear interrupt status */
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OUTWORD(GPIO_ISTA(port), (uint32_t) BIT64_MASK(32));
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/* Configure GPIO device */
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dev_cfg->cfg_func();
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/* Enable PLIC interrupt GPIO source */
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irq_enable(dev_cfg->irq_num);
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return 0;
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}
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#define GPIO_ATCGPIO100_INIT(n) \
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static void gpio_atcgpio100_cfg_func_##n(void); \
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static struct gpio_atcgpio100_data gpio_atcgpio100_data_##n; \
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\
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static const struct gpio_atcgpio100_config \
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gpio_atcgpio100_config_##n = { \
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.common = { \
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.port_pin_mask = \
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GPIO_PORT_PIN_MASK_FROM_DT_INST(n), \
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}, \
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.base = DT_INST_REG_ADDR(n), \
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.irq_num = DT_INST_IRQN(n), \
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.cfg_func = gpio_atcgpio100_cfg_func_##n \
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}; \
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\
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DEVICE_DT_INST_DEFINE(n, \
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gpio_atcgpio100_init, \
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NULL, \
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&gpio_atcgpio100_data_##n, \
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&gpio_atcgpio100_config_##n, \
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PRE_KERNEL_1, \
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CONFIG_GPIO_INIT_PRIORITY, \
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&gpio_atcgpio100_api); \
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\
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static void gpio_atcgpio100_cfg_func_##n(void) \
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{ \
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IRQ_CONNECT(DT_INST_IRQN(n), \
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DT_INST_IRQ(n, priority), \
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gpio_atcgpio100_irq_handler, \
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DEVICE_DT_INST_GET(n), \
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0); \
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return; \
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} \
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DT_INST_FOREACH_STATUS_OKAY(GPIO_ATCGPIO100_INIT)
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