2 * Copyright (c) 2010-2016, NVIDIA CORPORATION.
3 * (based on tegra_gpio.c)
5 * SPDX-License-Identifier: GPL-2.0
14 #include <asm/bitops.h>
16 #include <dm/device-internal.h>
17 #include <dt-bindings/gpio/gpio.h>
18 #include "tegra186_gpio_priv.h"
20 DECLARE_GLOBAL_DATA_PTR;
22 struct tegra186_gpio_port_data {
27 struct tegra186_gpio_ctlr_data {
28 const struct tegra186_gpio_port_data *ports;
32 struct tegra186_gpio_platdata {
37 static uint32_t *tegra186_gpio_reg(struct udevice *dev, uint32_t reg,
40 struct tegra186_gpio_platdata *plat = dev->platdata;
41 uint32_t index = (reg + (gpio * TEGRA186_GPIO_PER_GPIO_STRIDE)) / 4;
43 return &(plat->regs[index]);
46 static int tegra186_gpio_set_out(struct udevice *dev, unsigned offset,
52 reg = tegra186_gpio_reg(dev, TEGRA186_GPIO_OUTPUT_CONTROL, offset);
55 rval &= ~TEGRA186_GPIO_OUTPUT_CONTROL_FLOATED;
57 rval |= TEGRA186_GPIO_OUTPUT_CONTROL_FLOATED;
60 reg = tegra186_gpio_reg(dev, TEGRA186_GPIO_ENABLE_CONFIG, offset);
63 rval |= TEGRA186_GPIO_ENABLE_CONFIG_OUT;
65 rval &= ~TEGRA186_GPIO_ENABLE_CONFIG_OUT;
66 rval |= TEGRA186_GPIO_ENABLE_CONFIG_ENABLE;
72 static int tegra186_gpio_set_val(struct udevice *dev, unsigned offset, bool val)
77 reg = tegra186_gpio_reg(dev, TEGRA186_GPIO_OUTPUT_VALUE, offset);
80 rval |= TEGRA186_GPIO_OUTPUT_VALUE_HIGH;
82 rval &= ~TEGRA186_GPIO_OUTPUT_VALUE_HIGH;
88 static int tegra186_gpio_direction_input(struct udevice *dev, unsigned offset)
90 return tegra186_gpio_set_out(dev, offset, false);
93 static int tegra186_gpio_direction_output(struct udevice *dev, unsigned offset,
98 ret = tegra186_gpio_set_val(dev, offset, value != 0);
101 return tegra186_gpio_set_out(dev, offset, true);
104 static int tegra186_gpio_get_value(struct udevice *dev, unsigned offset)
109 reg = tegra186_gpio_reg(dev, TEGRA186_GPIO_ENABLE_CONFIG, offset);
112 if (rval & TEGRA186_GPIO_ENABLE_CONFIG_OUT)
113 reg = tegra186_gpio_reg(dev, TEGRA186_GPIO_OUTPUT_VALUE,
116 reg = tegra186_gpio_reg(dev, TEGRA186_GPIO_INPUT, offset);
122 static int tegra186_gpio_set_value(struct udevice *dev, unsigned offset,
125 return tegra186_gpio_set_val(dev, offset, value != 0);
128 static int tegra186_gpio_get_function(struct udevice *dev, unsigned offset)
133 reg = tegra186_gpio_reg(dev, TEGRA186_GPIO_ENABLE_CONFIG, offset);
135 if (rval & TEGRA186_GPIO_ENABLE_CONFIG_OUT)
141 static int tegra186_gpio_xlate(struct udevice *dev, struct gpio_desc *desc,
142 struct fdtdec_phandle_args *args)
146 gpio = args->args[0];
147 port = gpio / TEGRA186_GPIO_PER_GPIO_COUNT;
148 ret = device_get_child(dev, port, &desc->dev);
151 desc->offset = gpio % TEGRA186_GPIO_PER_GPIO_COUNT;
152 desc->flags = args->args[1] & GPIO_ACTIVE_LOW ? GPIOD_ACTIVE_LOW : 0;
157 static const struct dm_gpio_ops tegra186_gpio_ops = {
158 .direction_input = tegra186_gpio_direction_input,
159 .direction_output = tegra186_gpio_direction_output,
160 .get_value = tegra186_gpio_get_value,
161 .set_value = tegra186_gpio_set_value,
162 .get_function = tegra186_gpio_get_function,
163 .xlate = tegra186_gpio_xlate,
167 * We have a top-level GPIO device with no actual GPIOs. It has a child device
168 * for each port within the controller.
170 static int tegra186_gpio_bind(struct udevice *parent)
172 struct tegra186_gpio_platdata *parent_plat = parent->platdata;
173 struct tegra186_gpio_ctlr_data *ctlr_data =
174 (struct tegra186_gpio_ctlr_data *)dev_get_driver_data(parent);
178 /* If this is a child device, there is nothing to do here */
182 regs = (uint32_t *)dev_get_addr_name(parent, "gpio");
183 if (regs == (uint32_t *)FDT_ADDR_T_NONE)
186 for (port = 0; port < ctlr_data->port_count; port++) {
187 struct tegra186_gpio_platdata *plat;
190 plat = calloc(1, sizeof(*plat));
193 plat->name = ctlr_data->ports[port].name;
194 plat->regs = &(regs[ctlr_data->ports[port].offset / 4]);
196 ret = device_bind(parent, parent->driver, plat->name, plat,
200 dev_set_of_offset(dev, dev_of_offset(parent));
206 static int tegra186_gpio_probe(struct udevice *dev)
208 struct tegra186_gpio_platdata *plat = dev->platdata;
209 struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
211 /* Only child devices have ports */
215 uc_priv->gpio_count = TEGRA186_GPIO_PER_GPIO_COUNT;
216 uc_priv->bank_name = plat->name;
221 static const struct tegra186_gpio_port_data tegra186_gpio_main_ports[] = {
247 static const struct tegra186_gpio_ctlr_data tegra186_gpio_main_data = {
248 .ports = tegra186_gpio_main_ports,
249 .port_count = ARRAY_SIZE(tegra186_gpio_main_ports),
252 static const struct tegra186_gpio_port_data tegra186_gpio_aon_ports[] = {
263 static const struct tegra186_gpio_ctlr_data tegra186_gpio_aon_data = {
264 .ports = tegra186_gpio_aon_ports,
265 .port_count = ARRAY_SIZE(tegra186_gpio_aon_ports),
268 static const struct udevice_id tegra186_gpio_ids[] = {
270 .compatible = "nvidia,tegra186-gpio",
271 .data = (ulong)&tegra186_gpio_main_data,
274 .compatible = "nvidia,tegra186-gpio-aon",
275 .data = (ulong)&tegra186_gpio_aon_data,
280 U_BOOT_DRIVER(tegra186_gpio) = {
281 .name = "tegra186_gpio",
283 .of_match = tegra186_gpio_ids,
284 .bind = tegra186_gpio_bind,
285 .probe = tegra186_gpio_probe,
286 .ops = &tegra186_gpio_ops,
287 .flags = DM_FLAG_PRE_RELOC,