drivers/st/gpio/stm32_gpio.c - filogic/atf - Gitiles

 /*
  * Copyright (c) 2016-2021, STMicroelectronics - All Rights Reserved
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */

 #include <assert.h>
 #include <errno.h>
 #include <stdbool.h>

 #include <libfdt.h>

 #include <platform_def.h>

 #include <common/bl_common.h>
 #include <common/debug.h>
 #include <drivers/st/stm32_gpio.h>
 #include <drivers/st/stm32mp_clkfunc.h>
 #include <lib/mmio.h>
 #include <lib/utils_def.h>

 #define DT_GPIO_BANK_SHIFT	12
 #define DT_GPIO_BANK_MASK	GENMASK(16, 12)
 #define DT_GPIO_PIN_SHIFT	8
 #define DT_GPIO_PIN_MASK	GENMASK(11, 8)
 #define DT_GPIO_MODE_MASK	GENMASK(7, 0)

 /*******************************************************************************
  * This function gets GPIO bank node in DT.
  * Returns node offset if status is okay in DT, else return 0
  ******************************************************************************/
 static int ckeck_gpio_bank(void *fdt, uint32_t bank, int pinctrl_node)
 {
 	int pinctrl_subnode;
 	uint32_t bank_offset = stm32_get_gpio_bank_offset(bank);

 	fdt_for_each_subnode(pinctrl_subnode, fdt, pinctrl_node) {
 		const fdt32_t *cuint;

 		if (fdt_getprop(fdt, pinctrl_subnode,
 				"gpio-controller", NULL) == NULL) {
 			continue;
 		}

 		cuint = fdt_getprop(fdt, pinctrl_subnode, "reg", NULL);
 		if (cuint == NULL) {
 			continue;
 		}

 		if ((fdt32_to_cpu(*cuint) == bank_offset) &&
 		    (fdt_get_status(pinctrl_subnode) != DT_DISABLED)) {
 			return pinctrl_subnode;
 		}
 	}

 	return 0;
 }

 /*******************************************************************************
  * This function gets the pin settings from DT information.
  * When analyze and parsing is done, set the GPIO registers.
  * Returns 0 on success and a negative FDT error code on failure.
  ******************************************************************************/
 static int dt_set_gpio_config(void *fdt, int node, uint8_t status)
 {
 	const fdt32_t *cuint, *slewrate;
 	int len;
 	int pinctrl_node;
 	uint32_t i;
 	uint32_t speed = GPIO_SPEED_LOW;
 	uint32_t pull = GPIO_NO_PULL;

 	cuint = fdt_getprop(fdt, node, "pinmux", &len);
 	if (cuint == NULL) {
 		return -FDT_ERR_NOTFOUND;
 	}

 	pinctrl_node = fdt_parent_offset(fdt, fdt_parent_offset(fdt, node));
 	if (pinctrl_node < 0) {
 		return -FDT_ERR_NOTFOUND;
 	}

 	slewrate = fdt_getprop(fdt, node, "slew-rate", NULL);
 	if (slewrate != NULL) {
 		speed = fdt32_to_cpu(*slewrate);
 	}

 	if (fdt_getprop(fdt, node, "bias-pull-up", NULL) != NULL) {
 		pull = GPIO_PULL_UP;
 	} else if (fdt_getprop(fdt, node, "bias-pull-down", NULL) != NULL) {
 		pull = GPIO_PULL_DOWN;
 	} else {
 		VERBOSE("No bias configured in node %d\n", node);
 	}

 	for (i = 0U; i < ((uint32_t)len / sizeof(uint32_t)); i++) {
 		uint32_t pincfg;
 		uint32_t bank;
 		uint32_t pin;
 		uint32_t mode;
 		uint32_t alternate = GPIO_ALTERNATE_(0);
 		int bank_node;
 		int clk;

 		pincfg = fdt32_to_cpu(*cuint);
 		cuint++;

 		bank = (pincfg & DT_GPIO_BANK_MASK) >> DT_GPIO_BANK_SHIFT;

 		pin = (pincfg & DT_GPIO_PIN_MASK) >> DT_GPIO_PIN_SHIFT;

 		mode = pincfg & DT_GPIO_MODE_MASK;

 		switch (mode) {
 		case 0:
 			mode = GPIO_MODE_INPUT;
 			break;
 		case 1 ... 16:
 			alternate = mode - 1U;
 			mode = GPIO_MODE_ALTERNATE;
 			break;
 		case 17:
 			mode = GPIO_MODE_ANALOG;
 			break;
 		default:
 			mode = GPIO_MODE_OUTPUT;
 			break;
 		}

 		if (fdt_getprop(fdt, node, "drive-open-drain", NULL) != NULL) {
 			mode |= GPIO_OPEN_DRAIN;
 		}

 		bank_node = ckeck_gpio_bank(fdt, bank, pinctrl_node);
 		if (bank_node == 0) {
 			ERROR("PINCTRL inconsistent in DT\n");
 			panic();
 		}

 		clk = fdt_get_clock_id(bank_node);
 		if (clk < 0) {
 			return -FDT_ERR_NOTFOUND;
 		}

 		/* Platform knows the clock: assert it is okay */
 		assert((unsigned long)clk == stm32_get_gpio_bank_clock(bank));

 		set_gpio(bank, pin, mode, speed, pull, alternate, status);
 	}

 	return 0;
 }

 /*******************************************************************************
  * This function gets the pin settings from DT information.
  * When analyze and parsing is done, set the GPIO registers.
  * Returns 0 on success and a negative FDT/ERRNO error code on failure.
  ******************************************************************************/
 int dt_set_pinctrl_config(int node)
 {
 	const fdt32_t *cuint;
 	int lenp = 0;
 	uint32_t i;
 	uint8_t status;
 	void *fdt;

 	if (fdt_get_address(&fdt) == 0) {
 		return -FDT_ERR_NOTFOUND;
 	}

 	status = fdt_get_status(node);
 	if (status == DT_DISABLED) {
 		return -FDT_ERR_NOTFOUND;
 	}

 	cuint = fdt_getprop(fdt, node, "pinctrl-0", &lenp);
 	if (cuint == NULL) {
 		return -FDT_ERR_NOTFOUND;
 	}

 	for (i = 0; i < ((uint32_t)lenp / 4U); i++) {
 		int p_node, p_subnode;

 		p_node = fdt_node_offset_by_phandle(fdt, fdt32_to_cpu(*cuint));
 		if (p_node < 0) {
 			return -FDT_ERR_NOTFOUND;
 		}

 		fdt_for_each_subnode(p_subnode, fdt, p_node) {
 			int ret = dt_set_gpio_config(fdt, p_subnode, status);

 			if (ret < 0) {
 				return ret;
 			}
 		}

 		cuint++;
 	}

 	return 0;
 }

 void set_gpio(uint32_t bank, uint32_t pin, uint32_t mode, uint32_t speed,
 	      uint32_t pull, uint32_t alternate, uint8_t status)
 {
 	uintptr_t base = stm32_get_gpio_bank_base(bank);
 	unsigned long clock = stm32_get_gpio_bank_clock(bank);

 	assert(pin <= GPIO_PIN_MAX);

 	stm32mp_clk_enable(clock);

 	mmio_clrbits_32(base + GPIO_MODE_OFFSET,
 			((uint32_t)GPIO_MODE_MASK << (pin << 1)));
 	mmio_setbits_32(base + GPIO_MODE_OFFSET,
 			(mode & ~GPIO_OPEN_DRAIN) << (pin << 1));

 	if ((mode & GPIO_OPEN_DRAIN) != 0U) {
 		mmio_setbits_32(base + GPIO_TYPE_OFFSET, BIT(pin));
 	} else {
 		mmio_clrbits_32(base + GPIO_TYPE_OFFSET, BIT(pin));
 	}

 	mmio_clrbits_32(base + GPIO_SPEED_OFFSET,
 			((uint32_t)GPIO_SPEED_MASK << (pin << 1)));
 	mmio_setbits_32(base + GPIO_SPEED_OFFSET, speed << (pin << 1));

 	mmio_clrbits_32(base + GPIO_PUPD_OFFSET,
 			((uint32_t)GPIO_PULL_MASK << (pin << 1)));
 	mmio_setbits_32(base + GPIO_PUPD_OFFSET, pull << (pin << 1));

 	if (pin < GPIO_ALT_LOWER_LIMIT) {
 		mmio_clrbits_32(base + GPIO_AFRL_OFFSET,
 				((uint32_t)GPIO_ALTERNATE_MASK << (pin << 2)));
 		mmio_setbits_32(base + GPIO_AFRL_OFFSET,
 				alternate << (pin << 2));
 	} else {
 		mmio_clrbits_32(base + GPIO_AFRH_OFFSET,
 				((uint32_t)GPIO_ALTERNATE_MASK <<
 				 ((pin - GPIO_ALT_LOWER_LIMIT) << 2)));
 		mmio_setbits_32(base + GPIO_AFRH_OFFSET,
 				alternate << ((pin - GPIO_ALT_LOWER_LIMIT) <<
 					      2));
 	}

 	VERBOSE("GPIO %u mode set to 0x%x\n", bank,
 		mmio_read_32(base + GPIO_MODE_OFFSET));
 	VERBOSE("GPIO %u speed set to 0x%x\n", bank,
 		mmio_read_32(base + GPIO_SPEED_OFFSET));
 	VERBOSE("GPIO %u mode pull to 0x%x\n", bank,
 		mmio_read_32(base + GPIO_PUPD_OFFSET));
 	VERBOSE("GPIO %u mode alternate low to 0x%x\n", bank,
 		mmio_read_32(base + GPIO_AFRL_OFFSET));
 	VERBOSE("GPIO %u mode alternate high to 0x%x\n", bank,
 		mmio_read_32(base + GPIO_AFRH_OFFSET));

 	stm32mp_clk_disable(clock);

 	if (status == DT_SECURE) {
 		stm32mp_register_secure_gpio(bank, pin);
 		set_gpio_secure_cfg(bank, pin, true);

 	} else {
 		stm32mp_register_non_secure_gpio(bank, pin);
 		set_gpio_secure_cfg(bank, pin, false);
 	}
 }

 void set_gpio_secure_cfg(uint32_t bank, uint32_t pin, bool secure)
 {
 	uintptr_t base = stm32_get_gpio_bank_base(bank);
 	unsigned long clock = stm32_get_gpio_bank_clock(bank);

 	assert(pin <= GPIO_PIN_MAX);

 	stm32mp_clk_enable(clock);

 	if (secure) {
 		mmio_setbits_32(base + GPIO_SECR_OFFSET, BIT(pin));
 	} else {
 		mmio_clrbits_32(base + GPIO_SECR_OFFSET, BIT(pin));
 	}

 	stm32mp_clk_disable(clock);
 }

 void set_gpio_reset_cfg(uint32_t bank, uint32_t pin)
 {
 	set_gpio(bank, pin, GPIO_MODE_ANALOG, GPIO_SPEED_LOW,
 		 GPIO_NO_PULL, GPIO_ALTERNATE_(0), DT_DISABLED);
 	set_gpio_secure_cfg(bank, pin, stm32_gpio_is_secure_at_reset(bank));
 }
	/*
	* Copyright (c) 2016-2021, STMicroelectronics - All Rights Reserved
	*
	* SPDX-License-Identifier: BSD-3-Clause
	*/

	#include <assert.h>
	#include <errno.h>
	#include <stdbool.h>

	#include <libfdt.h>

	#include <platform_def.h>

	#include <common/bl_common.h>
	#include <common/debug.h>
	#include <drivers/st/stm32_gpio.h>
	#include <drivers/st/stm32mp_clkfunc.h>
	#include <lib/mmio.h>
	#include <lib/utils_def.h>

	#define DT_GPIO_BANK_SHIFT 12
	#define DT_GPIO_BANK_MASK GENMASK(16, 12)
	#define DT_GPIO_PIN_SHIFT 8
	#define DT_GPIO_PIN_MASK GENMASK(11, 8)
	#define DT_GPIO_MODE_MASK GENMASK(7, 0)

	/*******************************************************************************
	* This function gets GPIO bank node in DT.
	* Returns node offset if status is okay in DT, else return 0
	******************************************************************************/
	static int ckeck_gpio_bank(void *fdt, uint32_t bank, int pinctrl_node)
	{
	int pinctrl_subnode;
	uint32_t bank_offset = stm32_get_gpio_bank_offset(bank);

	fdt_for_each_subnode(pinctrl_subnode, fdt, pinctrl_node) {
	const fdt32_t *cuint;

	if (fdt_getprop(fdt, pinctrl_subnode,
	"gpio-controller", NULL) == NULL) {
	continue;
	}

	cuint = fdt_getprop(fdt, pinctrl_subnode, "reg", NULL);
	if (cuint == NULL) {
	continue;
	}

	if ((fdt32_to_cpu(*cuint) == bank_offset) &&
	(fdt_get_status(pinctrl_subnode) != DT_DISABLED)) {
	return pinctrl_subnode;
	}
	}

	return 0;
	}

	/*******************************************************************************
	* This function gets the pin settings from DT information.
	* When analyze and parsing is done, set the GPIO registers.
	* Returns 0 on success and a negative FDT error code on failure.
	******************************************************************************/
	static int dt_set_gpio_config(void *fdt, int node, uint8_t status)
	{
	const fdt32_t cuint, slewrate;
	int len;
	int pinctrl_node;
	uint32_t i;
	uint32_t speed = GPIO_SPEED_LOW;
	uint32_t pull = GPIO_NO_PULL;

	cuint = fdt_getprop(fdt, node, "pinmux", &len);
	if (cuint == NULL) {
	return -FDT_ERR_NOTFOUND;
	}

	pinctrl_node = fdt_parent_offset(fdt, fdt_parent_offset(fdt, node));
	if (pinctrl_node < 0) {
	return -FDT_ERR_NOTFOUND;
	}

	slewrate = fdt_getprop(fdt, node, "slew-rate", NULL);
	if (slewrate != NULL) {
	speed = fdt32_to_cpu(*slewrate);
	}

	if (fdt_getprop(fdt, node, "bias-pull-up", NULL) != NULL) {
	pull = GPIO_PULL_UP;
	} else if (fdt_getprop(fdt, node, "bias-pull-down", NULL) != NULL) {
	pull = GPIO_PULL_DOWN;
	} else {
	VERBOSE("No bias configured in node %d\n", node);
	}

	for (i = 0U; i < ((uint32_t)len / sizeof(uint32_t)); i++) {
	uint32_t pincfg;
	uint32_t bank;
	uint32_t pin;
	uint32_t mode;
	uint32_t alternate = GPIO_ALTERNATE_(0);
	int bank_node;
	int clk;

	pincfg = fdt32_to_cpu(*cuint);
	cuint++;

	bank = (pincfg & DT_GPIO_BANK_MASK) >> DT_GPIO_BANK_SHIFT;

	pin = (pincfg & DT_GPIO_PIN_MASK) >> DT_GPIO_PIN_SHIFT;

	mode = pincfg & DT_GPIO_MODE_MASK;

	switch (mode) {
	case 0:
	mode = GPIO_MODE_INPUT;
	break;
	case 1 ... 16:
	alternate = mode - 1U;
	mode = GPIO_MODE_ALTERNATE;
	break;
	case 17:
	mode = GPIO_MODE_ANALOG;
	break;
	default:
	mode = GPIO_MODE_OUTPUT;
	break;
	}

	if (fdt_getprop(fdt, node, "drive-open-drain", NULL) != NULL) {
	mode \|= GPIO_OPEN_DRAIN;
	}

	bank_node = ckeck_gpio_bank(fdt, bank, pinctrl_node);
	if (bank_node == 0) {
	ERROR("PINCTRL inconsistent in DT\n");
	panic();
	}

	clk = fdt_get_clock_id(bank_node);
	if (clk < 0) {
	return -FDT_ERR_NOTFOUND;
	}

	/* Platform knows the clock: assert it is okay */
	assert((unsigned long)clk == stm32_get_gpio_bank_clock(bank));

	set_gpio(bank, pin, mode, speed, pull, alternate, status);
	}

	return 0;
	}

	/*******************************************************************************
	* This function gets the pin settings from DT information.
	* When analyze and parsing is done, set the GPIO registers.
	* Returns 0 on success and a negative FDT/ERRNO error code on failure.
	******************************************************************************/
	int dt_set_pinctrl_config(int node)
	{
	const fdt32_t *cuint;
	int lenp = 0;
	uint32_t i;
	uint8_t status;
	void *fdt;

	if (fdt_get_address(&fdt) == 0) {
	return -FDT_ERR_NOTFOUND;
	}

	status = fdt_get_status(node);
	if (status == DT_DISABLED) {
	return -FDT_ERR_NOTFOUND;
	}

	cuint = fdt_getprop(fdt, node, "pinctrl-0", &lenp);
	if (cuint == NULL) {
	return -FDT_ERR_NOTFOUND;
	}

	for (i = 0; i < ((uint32_t)lenp / 4U); i++) {
	int p_node, p_subnode;

	p_node = fdt_node_offset_by_phandle(fdt, fdt32_to_cpu(*cuint));
	if (p_node < 0) {
	return -FDT_ERR_NOTFOUND;
	}

	fdt_for_each_subnode(p_subnode, fdt, p_node) {
	int ret = dt_set_gpio_config(fdt, p_subnode, status);

	if (ret < 0) {
	return ret;
	}
	}

	cuint++;
	}

	return 0;
	}

	void set_gpio(uint32_t bank, uint32_t pin, uint32_t mode, uint32_t speed,
	uint32_t pull, uint32_t alternate, uint8_t status)
	{
	uintptr_t base = stm32_get_gpio_bank_base(bank);
	unsigned long clock = stm32_get_gpio_bank_clock(bank);

	assert(pin <= GPIO_PIN_MAX);

	stm32mp_clk_enable(clock);

	mmio_clrbits_32(base + GPIO_MODE_OFFSET,
	((uint32_t)GPIO_MODE_MASK << (pin << 1)));
	mmio_setbits_32(base + GPIO_MODE_OFFSET,
	(mode & ~GPIO_OPEN_DRAIN) << (pin << 1));

	if ((mode & GPIO_OPEN_DRAIN) != 0U) {
	mmio_setbits_32(base + GPIO_TYPE_OFFSET, BIT(pin));
	} else {
	mmio_clrbits_32(base + GPIO_TYPE_OFFSET, BIT(pin));
	}

	mmio_clrbits_32(base + GPIO_SPEED_OFFSET,
	((uint32_t)GPIO_SPEED_MASK << (pin << 1)));
	mmio_setbits_32(base + GPIO_SPEED_OFFSET, speed << (pin << 1));

	mmio_clrbits_32(base + GPIO_PUPD_OFFSET,
	((uint32_t)GPIO_PULL_MASK << (pin << 1)));
	mmio_setbits_32(base + GPIO_PUPD_OFFSET, pull << (pin << 1));

	if (pin < GPIO_ALT_LOWER_LIMIT) {
	mmio_clrbits_32(base + GPIO_AFRL_OFFSET,
	((uint32_t)GPIO_ALTERNATE_MASK << (pin << 2)));
	mmio_setbits_32(base + GPIO_AFRL_OFFSET,
	alternate << (pin << 2));
	} else {
	mmio_clrbits_32(base + GPIO_AFRH_OFFSET,
	((uint32_t)GPIO_ALTERNATE_MASK <<
	((pin - GPIO_ALT_LOWER_LIMIT) << 2)));
	mmio_setbits_32(base + GPIO_AFRH_OFFSET,
	alternate << ((pin - GPIO_ALT_LOWER_LIMIT) <<
	2));
	}

	VERBOSE("GPIO %u mode set to 0x%x\n", bank,
	mmio_read_32(base + GPIO_MODE_OFFSET));
	VERBOSE("GPIO %u speed set to 0x%x\n", bank,
	mmio_read_32(base + GPIO_SPEED_OFFSET));
	VERBOSE("GPIO %u mode pull to 0x%x\n", bank,
	mmio_read_32(base + GPIO_PUPD_OFFSET));
	VERBOSE("GPIO %u mode alternate low to 0x%x\n", bank,
	mmio_read_32(base + GPIO_AFRL_OFFSET));
	VERBOSE("GPIO %u mode alternate high to 0x%x\n", bank,
	mmio_read_32(base + GPIO_AFRH_OFFSET));

	stm32mp_clk_disable(clock);

	if (status == DT_SECURE) {
	stm32mp_register_secure_gpio(bank, pin);
	set_gpio_secure_cfg(bank, pin, true);

	} else {
	stm32mp_register_non_secure_gpio(bank, pin);
	set_gpio_secure_cfg(bank, pin, false);
	}
	}

	void set_gpio_secure_cfg(uint32_t bank, uint32_t pin, bool secure)
	{
	uintptr_t base = stm32_get_gpio_bank_base(bank);
	unsigned long clock = stm32_get_gpio_bank_clock(bank);

	assert(pin <= GPIO_PIN_MAX);

	stm32mp_clk_enable(clock);

	if (secure) {
	mmio_setbits_32(base + GPIO_SECR_OFFSET, BIT(pin));
	} else {
	mmio_clrbits_32(base + GPIO_SECR_OFFSET, BIT(pin));
	}

	stm32mp_clk_disable(clock);
	}

	void set_gpio_reset_cfg(uint32_t bank, uint32_t pin)
	{
	set_gpio(bank, pin, GPIO_MODE_ANALOG, GPIO_SPEED_LOW,
	GPIO_NO_PULL, GPIO_ALTERNATE_(0), DT_DISABLED);
	set_gpio_secure_cfg(bank, pin, stm32_gpio_is_secure_at_reset(bank));
	}