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https://source.denx.de/u-boot/u-boot.git
synced 2025-10-31 00:11:51 +01:00
7c84319af9
In U-Boot -ENODEV means that there is no device. When there is a problem with the device, drivers should return an error like -ENXIO or -EREMOTEIO. When the device tree properties cannot be read correct , they should return -EINVAL. Update various GPIO drivers to follow this rule, to help with consistency for future driver writers. Signed-off-by: Simon Glass <sjg@chromium.org> Reported-by: Adam Ford <aford173@gmail.com>
289 lines
6.6 KiB
C
289 lines
6.6 KiB
C
/*
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* Copyright (c) 2010-2016, NVIDIA CORPORATION.
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* (based on tegra_gpio.c)
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*
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* SPDX-License-Identifier: GPL-2.0
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*/
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#include <common.h>
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#include <dm.h>
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#include <malloc.h>
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#include <errno.h>
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#include <fdtdec.h>
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#include <asm/io.h>
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#include <asm/bitops.h>
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#include <asm/gpio.h>
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#include <dm/device-internal.h>
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#include <dt-bindings/gpio/gpio.h>
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#include "tegra186_gpio_priv.h"
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DECLARE_GLOBAL_DATA_PTR;
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struct tegra186_gpio_port_data {
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const char *name;
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uint32_t offset;
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};
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struct tegra186_gpio_ctlr_data {
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const struct tegra186_gpio_port_data *ports;
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uint32_t port_count;
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};
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struct tegra186_gpio_platdata {
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const char *name;
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uint32_t *regs;
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};
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static uint32_t *tegra186_gpio_reg(struct udevice *dev, uint32_t reg,
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uint32_t gpio)
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{
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struct tegra186_gpio_platdata *plat = dev->platdata;
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uint32_t index = (reg + (gpio * TEGRA186_GPIO_PER_GPIO_STRIDE)) / 4;
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return &(plat->regs[index]);
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}
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static int tegra186_gpio_set_out(struct udevice *dev, unsigned offset,
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bool output)
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{
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uint32_t *reg;
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uint32_t rval;
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reg = tegra186_gpio_reg(dev, TEGRA186_GPIO_OUTPUT_CONTROL, offset);
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rval = readl(reg);
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if (output)
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rval &= ~TEGRA186_GPIO_OUTPUT_CONTROL_FLOATED;
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else
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rval |= TEGRA186_GPIO_OUTPUT_CONTROL_FLOATED;
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writel(rval, reg);
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reg = tegra186_gpio_reg(dev, TEGRA186_GPIO_ENABLE_CONFIG, offset);
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rval = readl(reg);
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if (output)
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rval |= TEGRA186_GPIO_ENABLE_CONFIG_OUT;
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else
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rval &= ~TEGRA186_GPIO_ENABLE_CONFIG_OUT;
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rval |= TEGRA186_GPIO_ENABLE_CONFIG_ENABLE;
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writel(rval, reg);
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return 0;
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}
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static int tegra186_gpio_set_val(struct udevice *dev, unsigned offset, bool val)
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{
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uint32_t *reg;
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uint32_t rval;
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reg = tegra186_gpio_reg(dev, TEGRA186_GPIO_OUTPUT_VALUE, offset);
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rval = readl(reg);
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if (val)
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rval |= TEGRA186_GPIO_OUTPUT_VALUE_HIGH;
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else
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rval &= ~TEGRA186_GPIO_OUTPUT_VALUE_HIGH;
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writel(rval, reg);
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return 0;
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}
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static int tegra186_gpio_direction_input(struct udevice *dev, unsigned offset)
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{
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return tegra186_gpio_set_out(dev, offset, false);
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}
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static int tegra186_gpio_direction_output(struct udevice *dev, unsigned offset,
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int value)
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{
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int ret;
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ret = tegra186_gpio_set_val(dev, offset, value != 0);
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if (ret)
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return ret;
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return tegra186_gpio_set_out(dev, offset, true);
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}
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static int tegra186_gpio_get_value(struct udevice *dev, unsigned offset)
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{
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uint32_t *reg;
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uint32_t rval;
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reg = tegra186_gpio_reg(dev, TEGRA186_GPIO_ENABLE_CONFIG, offset);
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rval = readl(reg);
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if (rval & TEGRA186_GPIO_ENABLE_CONFIG_OUT)
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reg = tegra186_gpio_reg(dev, TEGRA186_GPIO_OUTPUT_VALUE,
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offset);
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else
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reg = tegra186_gpio_reg(dev, TEGRA186_GPIO_INPUT, offset);
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rval = readl(reg);
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return !!rval;
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}
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static int tegra186_gpio_set_value(struct udevice *dev, unsigned offset,
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int value)
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{
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return tegra186_gpio_set_val(dev, offset, value != 0);
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}
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static int tegra186_gpio_get_function(struct udevice *dev, unsigned offset)
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{
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uint32_t *reg;
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uint32_t rval;
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reg = tegra186_gpio_reg(dev, TEGRA186_GPIO_ENABLE_CONFIG, offset);
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rval = readl(reg);
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if (rval & TEGRA186_GPIO_ENABLE_CONFIG_OUT)
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return GPIOF_OUTPUT;
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else
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return GPIOF_INPUT;
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}
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static int tegra186_gpio_xlate(struct udevice *dev, struct gpio_desc *desc,
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struct ofnode_phandle_args *args)
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{
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int gpio, port, ret;
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gpio = args->args[0];
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port = gpio / TEGRA186_GPIO_PER_GPIO_COUNT;
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ret = device_get_child(dev, port, &desc->dev);
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if (ret)
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return ret;
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desc->offset = gpio % TEGRA186_GPIO_PER_GPIO_COUNT;
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desc->flags = args->args[1] & GPIO_ACTIVE_LOW ? GPIOD_ACTIVE_LOW : 0;
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return 0;
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}
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static const struct dm_gpio_ops tegra186_gpio_ops = {
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.direction_input = tegra186_gpio_direction_input,
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.direction_output = tegra186_gpio_direction_output,
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.get_value = tegra186_gpio_get_value,
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.set_value = tegra186_gpio_set_value,
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.get_function = tegra186_gpio_get_function,
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.xlate = tegra186_gpio_xlate,
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};
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/**
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* We have a top-level GPIO device with no actual GPIOs. It has a child device
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* for each port within the controller.
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*/
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static int tegra186_gpio_bind(struct udevice *parent)
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{
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struct tegra186_gpio_platdata *parent_plat = parent->platdata;
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struct tegra186_gpio_ctlr_data *ctlr_data =
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(struct tegra186_gpio_ctlr_data *)dev_get_driver_data(parent);
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uint32_t *regs;
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int port, ret;
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/* If this is a child device, there is nothing to do here */
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if (parent_plat)
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return 0;
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regs = (uint32_t *)devfdt_get_addr_name(parent, "gpio");
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if (regs == (uint32_t *)FDT_ADDR_T_NONE)
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return -EINVAL;
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for (port = 0; port < ctlr_data->port_count; port++) {
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struct tegra186_gpio_platdata *plat;
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struct udevice *dev;
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plat = calloc(1, sizeof(*plat));
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if (!plat)
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return -ENOMEM;
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plat->name = ctlr_data->ports[port].name;
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plat->regs = &(regs[ctlr_data->ports[port].offset / 4]);
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ret = device_bind(parent, parent->driver, plat->name, plat,
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-1, &dev);
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if (ret)
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return ret;
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dev_set_of_offset(dev, dev_of_offset(parent));
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}
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return 0;
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}
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static int tegra186_gpio_probe(struct udevice *dev)
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{
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struct tegra186_gpio_platdata *plat = dev->platdata;
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struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
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/* Only child devices have ports */
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if (!plat)
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return 0;
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uc_priv->gpio_count = TEGRA186_GPIO_PER_GPIO_COUNT;
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uc_priv->bank_name = plat->name;
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return 0;
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}
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static const struct tegra186_gpio_port_data tegra186_gpio_main_ports[] = {
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{"A", 0x2000},
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{"B", 0x3000},
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{"C", 0x3200},
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{"D", 0x3400},
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{"E", 0x2200},
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{"F", 0x2400},
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{"G", 0x4200},
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{"H", 0x1000},
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{"I", 0x0800},
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{"J", 0x5000},
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{"K", 0x5200},
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{"L", 0x1200},
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{"M", 0x5600},
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{"N", 0x0000},
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{"O", 0x0200},
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{"P", 0x4000},
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{"Q", 0x0400},
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{"R", 0x0a00},
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{"T", 0x0600},
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{"X", 0x1400},
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{"Y", 0x1600},
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{"BB", 0x2600},
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{"CC", 0x5400},
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};
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static const struct tegra186_gpio_ctlr_data tegra186_gpio_main_data = {
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.ports = tegra186_gpio_main_ports,
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.port_count = ARRAY_SIZE(tegra186_gpio_main_ports),
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};
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static const struct tegra186_gpio_port_data tegra186_gpio_aon_ports[] = {
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{"S", 0x0200},
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{"U", 0x0400},
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{"V", 0x0800},
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{"W", 0x0a00},
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{"Z", 0x0e00},
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{"AA", 0x0c00},
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{"EE", 0x0600},
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{"FF", 0x0000},
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};
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static const struct tegra186_gpio_ctlr_data tegra186_gpio_aon_data = {
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.ports = tegra186_gpio_aon_ports,
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.port_count = ARRAY_SIZE(tegra186_gpio_aon_ports),
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};
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static const struct udevice_id tegra186_gpio_ids[] = {
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{
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.compatible = "nvidia,tegra186-gpio",
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.data = (ulong)&tegra186_gpio_main_data,
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},
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{
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.compatible = "nvidia,tegra186-gpio-aon",
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.data = (ulong)&tegra186_gpio_aon_data,
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},
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{ }
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};
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U_BOOT_DRIVER(tegra186_gpio) = {
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.name = "tegra186_gpio",
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.id = UCLASS_GPIO,
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.of_match = tegra186_gpio_ids,
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.bind = tegra186_gpio_bind,
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.probe = tegra186_gpio_probe,
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.ops = &tegra186_gpio_ops,
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.flags = DM_FLAG_PRE_RELOC,
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};
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