gpio: add Tegra186 GPIO driver
Tegra186's GPIO controller register layout is significantly different from
previous chips, so add a new driver for it. In fact, there are two
different GPIO controllers in Tegra186 that share a similar register
layout, but very different port mapping. This driver covers both.
The DT binding is already present in the Linux kernel (in linux-next via
the Tegra tree so far).
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Reviewed-by: Simon Glass <sjg@chromium.org> # v1
Signed-off-by: Tom Warren <twarren@nvidia.com>
diff --git a/drivers/gpio/tegra186_gpio.c b/drivers/gpio/tegra186_gpio.c
new file mode 100644
index 0000000..1c68151
--- /dev/null
+++ b/drivers/gpio/tegra186_gpio.c
@@ -0,0 +1,288 @@
+/*
+ * 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 *)dev_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->of_offset = parent->of_offset;
+ }
+
+ 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,
+};