drivers/gpio/tegra186_gpio.c - platform/external/u-boot - Gitiles

 /*
  * Copyright (c) 2010-2016, NVIDIA CORPORATION.
  * (based on tegra_gpio.c)
  *
  * SPDX-License-Identifier: GPL-2.0
  */

 #include <common.h>
 #include <dm.h>
 #include <malloc.h>
 #include <errno.h>
 #include <fdtdec.h>
 #include <asm/io.h>
 #include <asm/bitops.h>
 #include <asm/gpio.h>
 #include <dm/device-internal.h>
 #include <dt-bindings/gpio/gpio.h>
 #include "tegra186_gpio_priv.h"

 DECLARE_GLOBAL_DATA_PTR;

 struct tegra186_gpio_port_data {
 	const char *name;
 	uint32_t offset;
 };

 struct tegra186_gpio_ctlr_data {
 	const struct tegra186_gpio_port_data *ports;
 	uint32_t port_count;
 };

 struct tegra186_gpio_platdata {
 	const char *name;
 	uint32_t *regs;
 };

 static uint32_t *tegra186_gpio_reg(struct udevice *dev, uint32_t reg,
 				   uint32_t gpio)
 {
 	struct tegra186_gpio_platdata *plat = dev->platdata;
 	uint32_t index = (reg + (gpio * TEGRA186_GPIO_PER_GPIO_STRIDE)) / 4;

 	return &(plat->regs[index]);
 }

 static int tegra186_gpio_set_out(struct udevice *dev, unsigned offset,
 				 bool output)
 {
 	uint32_t *reg;
 	uint32_t rval;

 	reg = tegra186_gpio_reg(dev, TEGRA186_GPIO_OUTPUT_CONTROL, offset);
 	rval = readl(reg);
 	if (output)
 		rval &= ~TEGRA186_GPIO_OUTPUT_CONTROL_FLOATED;
 	else
 		rval |= TEGRA186_GPIO_OUTPUT_CONTROL_FLOATED;
 	writel(rval, reg);

 	reg = tegra186_gpio_reg(dev, TEGRA186_GPIO_ENABLE_CONFIG, offset);
 	rval = readl(reg);
 	if (output)
 		rval |= TEGRA186_GPIO_ENABLE_CONFIG_OUT;
 	else
 		rval &= ~TEGRA186_GPIO_ENABLE_CONFIG_OUT;
 	rval |= TEGRA186_GPIO_ENABLE_CONFIG_ENABLE;
 	writel(rval, reg);

 	return 0;
 }

 static int tegra186_gpio_set_val(struct udevice *dev, unsigned offset, bool val)
 {
 	uint32_t *reg;
 	uint32_t rval;

 	reg = tegra186_gpio_reg(dev, TEGRA186_GPIO_OUTPUT_VALUE, offset);
 	rval = readl(reg);
 	if (val)
 		rval |= TEGRA186_GPIO_OUTPUT_VALUE_HIGH;
 	else
 		rval &= ~TEGRA186_GPIO_OUTPUT_VALUE_HIGH;
 	writel(rval, reg);

 	return 0;
 }

 static int tegra186_gpio_direction_input(struct udevice *dev, unsigned offset)
 {
 	return tegra186_gpio_set_out(dev, offset, false);
 }

 static int tegra186_gpio_direction_output(struct udevice *dev, unsigned offset,
 				       int value)
 {
 	int ret;

 	ret = tegra186_gpio_set_val(dev, offset, value != 0);
 	if (ret)
 		return ret;
 	return tegra186_gpio_set_out(dev, offset, true);
 }

 static int tegra186_gpio_get_value(struct udevice *dev, unsigned offset)
 {
 	uint32_t *reg;
 	uint32_t rval;

 	reg = tegra186_gpio_reg(dev, TEGRA186_GPIO_ENABLE_CONFIG, offset);
 	rval = readl(reg);

 	if (rval & TEGRA186_GPIO_ENABLE_CONFIG_OUT)
 		reg = tegra186_gpio_reg(dev, TEGRA186_GPIO_OUTPUT_VALUE,
 					offset);
 	else
 		reg = tegra186_gpio_reg(dev, TEGRA186_GPIO_INPUT, offset);

 	rval = readl(reg);
 	return !!rval;
 }

 static int tegra186_gpio_set_value(struct udevice *dev, unsigned offset,
 				   int value)
 {
 	return tegra186_gpio_set_val(dev, offset, value != 0);
 }

 static int tegra186_gpio_get_function(struct udevice *dev, unsigned offset)
 {
 	uint32_t *reg;
 	uint32_t rval;

 	reg = tegra186_gpio_reg(dev, TEGRA186_GPIO_ENABLE_CONFIG, offset);
 	rval = readl(reg);
 	if (rval & TEGRA186_GPIO_ENABLE_CONFIG_OUT)
 		return GPIOF_OUTPUT;
 	else
 		return GPIOF_INPUT;
 }

 static int tegra186_gpio_xlate(struct udevice *dev, struct gpio_desc *desc,
 			    struct fdtdec_phandle_args *args)
 {
 	int gpio, port, ret;

 	gpio = args->args[0];
 	port = gpio / TEGRA186_GPIO_PER_GPIO_COUNT;
 	ret = device_get_child(dev, port, &desc->dev);
 	if (ret)
 		return ret;
 	desc->offset = gpio % TEGRA186_GPIO_PER_GPIO_COUNT;
 	desc->flags = args->args[1] & GPIO_ACTIVE_LOW ? GPIOD_ACTIVE_LOW : 0;

 	return 0;
 }

 static const struct dm_gpio_ops tegra186_gpio_ops = {
 	.direction_input	= tegra186_gpio_direction_input,
 	.direction_output	= tegra186_gpio_direction_output,
 	.get_value		= tegra186_gpio_get_value,
 	.set_value		= tegra186_gpio_set_value,
 	.get_function		= tegra186_gpio_get_function,
 	.xlate			= tegra186_gpio_xlate,
 };

 /**
  * We have a top-level GPIO device with no actual GPIOs. It has a child device
  * for each port within the controller.
  */
 static int tegra186_gpio_bind(struct udevice *parent)
 {
 	struct tegra186_gpio_platdata *parent_plat = parent->platdata;
 	struct tegra186_gpio_ctlr_data *ctlr_data =
 		(struct tegra186_gpio_ctlr_data *)dev_get_driver_data(parent);
 	uint32_t *regs;
 	int port, ret;

 	/* If this is a child device, there is nothing to do here */
 	if (parent_plat)
 		return 0;

 	regs = (uint32_t *)devfdt_get_addr_name(parent, "gpio");
 	if (regs == (uint32_t *)FDT_ADDR_T_NONE)
 		return -ENODEV;

 	for (port = 0; port < ctlr_data->port_count; port++) {
 		struct tegra186_gpio_platdata *plat;
 		struct udevice *dev;

 		plat = calloc(1, sizeof(*plat));
 		if (!plat)
 			return -ENOMEM;
 		plat->name = ctlr_data->ports[port].name;
 		plat->regs = &(regs[ctlr_data->ports[port].offset / 4]);

 		ret = device_bind(parent, parent->driver, plat->name, plat,
 				  -1, &dev);
 		if (ret)
 			return ret;
 		dev_set_of_offset(dev, dev_of_offset(parent));
 	}

 	return 0;
 }

 static int tegra186_gpio_probe(struct udevice *dev)
 {
 	struct tegra186_gpio_platdata *plat = dev->platdata;
 	struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);

 	/* Only child devices have ports */
 	if (!plat)
 		return 0;

 	uc_priv->gpio_count = TEGRA186_GPIO_PER_GPIO_COUNT;
 	uc_priv->bank_name = plat->name;

 	return 0;
 }

 static const struct tegra186_gpio_port_data tegra186_gpio_main_ports[] = {
 	{"A",  0x2000},
 	{"B",  0x3000},
 	{"C",  0x3200},
 	{"D",  0x3400},
 	{"E",  0x2200},
 	{"F",  0x2400},
 	{"G",  0x4200},
 	{"H",  0x1000},
 	{"I",  0x0800},
 	{"J",  0x5000},
 	{"K",  0x5200},
 	{"L",  0x1200},
 	{"M",  0x5600},
 	{"N",  0x0000},
 	{"O",  0x0200},
 	{"P",  0x4000},
 	{"Q",  0x0400},
 	{"R",  0x0a00},
 	{"T",  0x0600},
 	{"X",  0x1400},
 	{"Y",  0x1600},
 	{"BB", 0x2600},
 	{"CC", 0x5400},
 };

 static const struct tegra186_gpio_ctlr_data tegra186_gpio_main_data = {
 	.ports = tegra186_gpio_main_ports,
 	.port_count = ARRAY_SIZE(tegra186_gpio_main_ports),
 };

 static const struct tegra186_gpio_port_data tegra186_gpio_aon_ports[] = {
 	{"S",  0x0200},
 	{"U",  0x0400},
 	{"V",  0x0800},
 	{"W",  0x0a00},
 	{"Z",  0x0e00},
 	{"AA", 0x0c00},
 	{"EE", 0x0600},
 	{"FF", 0x0000},
 };

 static const struct tegra186_gpio_ctlr_data tegra186_gpio_aon_data = {
 	.ports = tegra186_gpio_aon_ports,
 	.port_count = ARRAY_SIZE(tegra186_gpio_aon_ports),
 };

 static const struct udevice_id tegra186_gpio_ids[] = {
 	{
 		.compatible = "nvidia,tegra186-gpio",
 		.data = (ulong)&tegra186_gpio_main_data,
 	},
 	{
 		.compatible = "nvidia,tegra186-gpio-aon",
 		.data = (ulong)&tegra186_gpio_aon_data,
 	},
 	{ }
 };

 U_BOOT_DRIVER(tegra186_gpio) = {
 	.name = "tegra186_gpio",
 	.id = UCLASS_GPIO,
 	.of_match = tegra186_gpio_ids,
 	.bind = tegra186_gpio_bind,
 	.probe = tegra186_gpio_probe,
 	.ops = &tegra186_gpio_ops,
 	.flags = DM_FLAG_PRE_RELOC,
 };
	/*
	* Copyright (c) 2010-2016, NVIDIA CORPORATION.
	* (based on tegra_gpio.c)
	*
	* SPDX-License-Identifier: GPL-2.0
	*/

	#include <common.h>
	#include <dm.h>
	#include <malloc.h>
	#include <errno.h>
	#include <fdtdec.h>
	#include <asm/io.h>
	#include <asm/bitops.h>
	#include <asm/gpio.h>
	#include <dm/device-internal.h>
	#include <dt-bindings/gpio/gpio.h>
	#include "tegra186_gpio_priv.h"

	DECLARE_GLOBAL_DATA_PTR;

	struct tegra186_gpio_port_data {
	const char *name;
	uint32_t offset;
	};

	struct tegra186_gpio_ctlr_data {
	const struct tegra186_gpio_port_data *ports;
	uint32_t port_count;
	};

	struct tegra186_gpio_platdata {
	const char *name;
	uint32_t *regs;
	};

	static uint32_t tegra186_gpio_reg(struct udevice dev, uint32_t reg,
	uint32_t gpio)
	{
	struct tegra186_gpio_platdata *plat = dev->platdata;
	uint32_t index = (reg + (gpio * TEGRA186_GPIO_PER_GPIO_STRIDE)) / 4;

	return &(plat->regs[index]);
	}

	static int tegra186_gpio_set_out(struct udevice *dev, unsigned offset,
	bool output)
	{
	uint32_t *reg;
	uint32_t rval;

	reg = tegra186_gpio_reg(dev, TEGRA186_GPIO_OUTPUT_CONTROL, offset);
	rval = readl(reg);
	if (output)
	rval &= ~TEGRA186_GPIO_OUTPUT_CONTROL_FLOATED;
	else
	rval \|= TEGRA186_GPIO_OUTPUT_CONTROL_FLOATED;
	writel(rval, reg);

	reg = tegra186_gpio_reg(dev, TEGRA186_GPIO_ENABLE_CONFIG, offset);
	rval = readl(reg);
	if (output)
	rval \|= TEGRA186_GPIO_ENABLE_CONFIG_OUT;
	else
	rval &= ~TEGRA186_GPIO_ENABLE_CONFIG_OUT;
	rval \|= TEGRA186_GPIO_ENABLE_CONFIG_ENABLE;
	writel(rval, reg);

	return 0;
	}

	static int tegra186_gpio_set_val(struct udevice *dev, unsigned offset, bool val)
	{
	uint32_t *reg;
	uint32_t rval;

	reg = tegra186_gpio_reg(dev, TEGRA186_GPIO_OUTPUT_VALUE, offset);
	rval = readl(reg);
	if (val)
	rval \|= TEGRA186_GPIO_OUTPUT_VALUE_HIGH;
	else
	rval &= ~TEGRA186_GPIO_OUTPUT_VALUE_HIGH;
	writel(rval, reg);

	return 0;
	}

	static int tegra186_gpio_direction_input(struct udevice *dev, unsigned offset)
	{
	return tegra186_gpio_set_out(dev, offset, false);
	}

	static int tegra186_gpio_direction_output(struct udevice *dev, unsigned offset,
	int value)
	{
	int ret;

	ret = tegra186_gpio_set_val(dev, offset, value != 0);
	if (ret)
	return ret;
	return tegra186_gpio_set_out(dev, offset, true);
	}

	static int tegra186_gpio_get_value(struct udevice *dev, unsigned offset)
	{
	uint32_t *reg;
	uint32_t rval;

	reg = tegra186_gpio_reg(dev, TEGRA186_GPIO_ENABLE_CONFIG, offset);
	rval = readl(reg);

	if (rval & TEGRA186_GPIO_ENABLE_CONFIG_OUT)
	reg = tegra186_gpio_reg(dev, TEGRA186_GPIO_OUTPUT_VALUE,
	offset);
	else
	reg = tegra186_gpio_reg(dev, TEGRA186_GPIO_INPUT, offset);

	rval = readl(reg);
	return !!rval;
	}

	static int tegra186_gpio_set_value(struct udevice *dev, unsigned offset,
	int value)
	{
	return tegra186_gpio_set_val(dev, offset, value != 0);
	}

	static int tegra186_gpio_get_function(struct udevice *dev, unsigned offset)
	{
	uint32_t *reg;
	uint32_t rval;

	reg = tegra186_gpio_reg(dev, TEGRA186_GPIO_ENABLE_CONFIG, offset);
	rval = readl(reg);
	if (rval & TEGRA186_GPIO_ENABLE_CONFIG_OUT)
	return GPIOF_OUTPUT;
	else
	return GPIOF_INPUT;
	}

	static int tegra186_gpio_xlate(struct udevice dev, struct gpio_desc desc,
	struct fdtdec_phandle_args *args)
	{
	int gpio, port, ret;

	gpio = args->args[0];
	port = gpio / TEGRA186_GPIO_PER_GPIO_COUNT;
	ret = device_get_child(dev, port, &desc->dev);
	if (ret)
	return ret;
	desc->offset = gpio % TEGRA186_GPIO_PER_GPIO_COUNT;
	desc->flags = args->args[1] & GPIO_ACTIVE_LOW ? GPIOD_ACTIVE_LOW : 0;

	return 0;
	}

	static const struct dm_gpio_ops tegra186_gpio_ops = {
	.direction_input = tegra186_gpio_direction_input,
	.direction_output = tegra186_gpio_direction_output,
	.get_value = tegra186_gpio_get_value,
	.set_value = tegra186_gpio_set_value,
	.get_function = tegra186_gpio_get_function,
	.xlate = tegra186_gpio_xlate,
	};

	/**
	* We have a top-level GPIO device with no actual GPIOs. It has a child device
	* for each port within the controller.
	*/
	static int tegra186_gpio_bind(struct udevice *parent)
	{
	struct tegra186_gpio_platdata *parent_plat = parent->platdata;
	struct tegra186_gpio_ctlr_data *ctlr_data =
	(struct tegra186_gpio_ctlr_data *)dev_get_driver_data(parent);
	uint32_t *regs;
	int port, ret;

	/* If this is a child device, there is nothing to do here */
	if (parent_plat)
	return 0;

	regs = (uint32_t *)devfdt_get_addr_name(parent, "gpio");
	if (regs == (uint32_t *)FDT_ADDR_T_NONE)
	return -ENODEV;

	for (port = 0; port < ctlr_data->port_count; port++) {
	struct tegra186_gpio_platdata *plat;
	struct udevice *dev;

	plat = calloc(1, sizeof(*plat));
	if (!plat)
	return -ENOMEM;
	plat->name = ctlr_data->ports[port].name;
	plat->regs = &(regs[ctlr_data->ports[port].offset / 4]);

	ret = device_bind(parent, parent->driver, plat->name, plat,
	-1, &dev);
	if (ret)
	return ret;
	dev_set_of_offset(dev, dev_of_offset(parent));
	}

	return 0;
	}

	static int tegra186_gpio_probe(struct udevice *dev)
	{
	struct tegra186_gpio_platdata *plat = dev->platdata;
	struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);

	/* Only child devices have ports */
	if (!plat)
	return 0;

	uc_priv->gpio_count = TEGRA186_GPIO_PER_GPIO_COUNT;
	uc_priv->bank_name = plat->name;

	return 0;
	}

	static const struct tegra186_gpio_port_data tegra186_gpio_main_ports[] = {
	{"A", 0x2000},
	{"B", 0x3000},
	{"C", 0x3200},
	{"D", 0x3400},
	{"E", 0x2200},
	{"F", 0x2400},
	{"G", 0x4200},
	{"H", 0x1000},
	{"I", 0x0800},
	{"J", 0x5000},
	{"K", 0x5200},
	{"L", 0x1200},
	{"M", 0x5600},
	{"N", 0x0000},
	{"O", 0x0200},
	{"P", 0x4000},
	{"Q", 0x0400},
	{"R", 0x0a00},
	{"T", 0x0600},
	{"X", 0x1400},
	{"Y", 0x1600},
	{"BB", 0x2600},
	{"CC", 0x5400},
	};

	static const struct tegra186_gpio_ctlr_data tegra186_gpio_main_data = {
	.ports = tegra186_gpio_main_ports,
	.port_count = ARRAY_SIZE(tegra186_gpio_main_ports),
	};

	static const struct tegra186_gpio_port_data tegra186_gpio_aon_ports[] = {
	{"S", 0x0200},
	{"U", 0x0400},
	{"V", 0x0800},
	{"W", 0x0a00},
	{"Z", 0x0e00},
	{"AA", 0x0c00},
	{"EE", 0x0600},
	{"FF", 0x0000},
	};

	static const struct tegra186_gpio_ctlr_data tegra186_gpio_aon_data = {
	.ports = tegra186_gpio_aon_ports,
	.port_count = ARRAY_SIZE(tegra186_gpio_aon_ports),
	};

	static const struct udevice_id tegra186_gpio_ids[] = {
	{
	.compatible = "nvidia,tegra186-gpio",
	.data = (ulong)&tegra186_gpio_main_data,
	},
	{
	.compatible = "nvidia,tegra186-gpio-aon",
	.data = (ulong)&tegra186_gpio_aon_data,
	},
	{ }
	};

	U_BOOT_DRIVER(tegra186_gpio) = {
	.name = "tegra186_gpio",
	.id = UCLASS_GPIO,
	.of_match = tegra186_gpio_ids,
	.bind = tegra186_gpio_bind,
	.probe = tegra186_gpio_probe,
	.ops = &tegra186_gpio_ops,
	.flags = DM_FLAG_PRE_RELOC,
	};