chip/stm32/gpio-stm32f4.c

/* Copyright 2016 The Chromium OS Authors. All rights reserved.
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

/* GPIO module for Chrome EC */

#include "clock.h"
#include "common.h"
#include "gpio.h"
#include "hooks.h"
#include "registers.h"
#include "task.h"
#include "util.h"

int gpio_required_clocks(void)
{
	const int gpio_ports_used = (0
#		define GPIO(name, pin, flags) pin
#		define GPIO_INT(name, pin, flags, signal) pin
#		define ALTERNATE(pinmask, function, module, flagz) pinmask
#		define PIN(port, index) | STM32_RCC_AHB1ENR_GPIO_PORT ## port
#		define PIN_MASK(port, mask) PIN(port, 0)
#		include "gpio.wrap"
	);

	/*
	 * If no ports are in use, then system_is_reboot_warm
	 * may not be valid.
	 */
	ASSERT(gpio_ports_used);

	return gpio_ports_used;
}

void gpio_enable_clocks(void)
{
	/* Enable only ports that are referenced in the gpio.inc */
	STM32_RCC_AHB1ENR |= gpio_required_clocks();

	/* Delay 1 AHB clock cycle after the clock is enabled */
	clock_wait_bus_cycles(BUS_AHB, 1);
}

static void gpio_init(void)
{
	/* Enable IRQs now that pins are set up */
	task_enable_irq(STM32_IRQ_EXTI0);
	task_enable_irq(STM32_IRQ_EXTI1);
	task_enable_irq(STM32_IRQ_EXTI2);
	task_enable_irq(STM32_IRQ_EXTI3);
	task_enable_irq(STM32_IRQ_EXTI4);
	task_enable_irq(STM32_IRQ_EXTI9_5);
	task_enable_irq(STM32_IRQ_EXTI15_10);
}
DECLARE_HOOK(HOOK_INIT, gpio_init, HOOK_PRIO_DEFAULT);

DECLARE_IRQ(STM32_IRQ_EXTI0, gpio_interrupt, 1);
DECLARE_IRQ(STM32_IRQ_EXTI1, gpio_interrupt, 1);
DECLARE_IRQ(STM32_IRQ_EXTI2, gpio_interrupt, 1);
DECLARE_IRQ(STM32_IRQ_EXTI3, gpio_interrupt, 1);
DECLARE_IRQ(STM32_IRQ_EXTI4, gpio_interrupt, 1);
DECLARE_IRQ(STM32_IRQ_EXTI9_5, gpio_interrupt, 1);
DECLARE_IRQ(STM32_IRQ_EXTI15_10, gpio_interrupt, 1);

#include "gpio-f0-l.c"