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// SPDX-License-Identifier: GPL-2.0-only OR BSD-3-Clause
/* Copyright (C) 2022 NVIDIA CORPORATION & AFFILIATES */
#include <linux/bitfield.h>
#include <linux/bitops.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/platform_device.h>
#include <linux/types.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinmux.h>
#define MLXBF3_NGPIOS_GPIO0 32
#define MLXBF3_MAX_GPIO_PINS 56
enum {
MLXBF3_GPIO_HW_MODE,
MLXBF3_GPIO_SW_MODE,
};
struct mlxbf3_pinctrl {
void __iomem *fw_ctrl_set0;
void __iomem *fw_ctrl_clr0;
void __iomem *fw_ctrl_set1;
void __iomem *fw_ctrl_clr1;
struct device *dev;
struct pinctrl_dev *pctl;
struct pinctrl_gpio_range gpio_range;
};
#define MLXBF3_GPIO_RANGE(_id, _pinbase, _gpiobase, _npins) \
{ \
.name = "mlxbf3_gpio_range", \
.id = _id, \
.base = _gpiobase, \
.pin_base = _pinbase, \
.npins = _npins, \
}
static struct pinctrl_gpio_range mlxbf3_pinctrl_gpio_ranges[] = {
MLXBF3_GPIO_RANGE(0, 0, 480, 32),
MLXBF3_GPIO_RANGE(1, 32, 456, 24),
};
static const struct pinctrl_pin_desc mlxbf3_pins[] = {
PINCTRL_PIN(0, "gpio0"),
PINCTRL_PIN(1, "gpio1"),
PINCTRL_PIN(2, "gpio2"),
PINCTRL_PIN(3, "gpio3"),
PINCTRL_PIN(4, "gpio4"),
PINCTRL_PIN(5, "gpio5"),
PINCTRL_PIN(6, "gpio6"),
PINCTRL_PIN(7, "gpio7"),
PINCTRL_PIN(8, "gpio8"),
PINCTRL_PIN(9, "gpio9"),
PINCTRL_PIN(10, "gpio10"),
PINCTRL_PIN(11, "gpio11"),
PINCTRL_PIN(12, "gpio12"),
PINCTRL_PIN(13, "gpio13"),
PINCTRL_PIN(14, "gpio14"),
PINCTRL_PIN(15, "gpio15"),
PINCTRL_PIN(16, "gpio16"),
PINCTRL_PIN(17, "gpio17"),
PINCTRL_PIN(18, "gpio18"),
PINCTRL_PIN(19, "gpio19"),
PINCTRL_PIN(20, "gpio20"),
PINCTRL_PIN(21, "gpio21"),
PINCTRL_PIN(22, "gpio22"),
PINCTRL_PIN(23, "gpio23"),
PINCTRL_PIN(24, "gpio24"),
PINCTRL_PIN(25, "gpio25"),
PINCTRL_PIN(26, "gpio26"),
PINCTRL_PIN(27, "gpio27"),
PINCTRL_PIN(28, "gpio28"),
PINCTRL_PIN(29, "gpio29"),
PINCTRL_PIN(30, "gpio30"),
PINCTRL_PIN(31, "gpio31"),
PINCTRL_PIN(32, "gpio32"),
PINCTRL_PIN(33, "gpio33"),
PINCTRL_PIN(34, "gpio34"),
PINCTRL_PIN(35, "gpio35"),
PINCTRL_PIN(36, "gpio36"),
PINCTRL_PIN(37, "gpio37"),
PINCTRL_PIN(38, "gpio38"),
PINCTRL_PIN(39, "gpio39"),
PINCTRL_PIN(40, "gpio40"),
PINCTRL_PIN(41, "gpio41"),
PINCTRL_PIN(42, "gpio42"),
PINCTRL_PIN(43, "gpio43"),
PINCTRL_PIN(44, "gpio44"),
PINCTRL_PIN(45, "gpio45"),
PINCTRL_PIN(46, "gpio46"),
PINCTRL_PIN(47, "gpio47"),
PINCTRL_PIN(48, "gpio48"),
PINCTRL_PIN(49, "gpio49"),
PINCTRL_PIN(50, "gpio50"),
PINCTRL_PIN(51, "gpio51"),
PINCTRL_PIN(52, "gpio52"),
PINCTRL_PIN(53, "gpio53"),
PINCTRL_PIN(54, "gpio54"),
PINCTRL_PIN(55, "gpio55"),
};
/*
* All single-pin functions can be mapped to any GPIO, however pinmux applies
* functions to pin groups and only those groups declared as supporting that
* function. To make this work we must put each pin in its own dummy group so
* that the functions can be described as applying to all pins.
* We use the same name as in the datasheet.
*/
static const char * const mlxbf3_pinctrl_single_group_names[] = {
"gpio0", "gpio1", "gpio2", "gpio3", "gpio4", "gpio5", "gpio6", "gpio7",
"gpio8", "gpio9", "gpio10", "gpio11", "gpio12", "gpio13", "gpio14", "gpio15",
"gpio16", "gpio17", "gpio18", "gpio19", "gpio20", "gpio21", "gpio22", "gpio23",
"gpio24", "gpio25", "gpio26", "gpio27", "gpio28", "gpio29", "gpio30", "gpio31",
"gpio32", "gpio33", "gpio34", "gpio35", "gpio36", "gpio37", "gpio38", "gpio39",
"gpio40", "gpio41", "gpio42", "gpio43", "gpio44", "gpio45", "gpio46", "gpio47",
"gpio48", "gpio49", "gpio50", "gpio51", "gpio52", "gpio53", "gpio54", "gpio55",
};
static int mlxbf3_get_groups_count(struct pinctrl_dev *pctldev)
{
/* Number single-pin groups */
return MLXBF3_MAX_GPIO_PINS;
}
static const char *mlxbf3_get_group_name(struct pinctrl_dev *pctldev,
unsigned int selector)
{
return mlxbf3_pinctrl_single_group_names[selector];
}
static int mlxbf3_get_group_pins(struct pinctrl_dev *pctldev,
unsigned int selector,
const unsigned int **pins,
unsigned int *num_pins)
{
/* return the dummy group for a single pin */
*pins = &selector;
*num_pins = 1;
return 0;
}
static const struct pinctrl_ops mlxbf3_pinctrl_group_ops = {
.get_groups_count = mlxbf3_get_groups_count,
.get_group_name = mlxbf3_get_group_name,
.get_group_pins = mlxbf3_get_group_pins,
};
/*
* Only 2 functions are supported and they apply to all pins:
* 1) Default hardware functionality
* 2) Software controlled GPIO
*/
static const char * const mlxbf3_gpiofunc_group_names[] = { "swctrl" };
static const char * const mlxbf3_hwfunc_group_names[] = { "hwctrl" };
static struct pinfunction mlxbf3_pmx_funcs[] = {
PINCTRL_PINFUNCTION("hwfunc", mlxbf3_hwfunc_group_names, 1),
PINCTRL_PINFUNCTION("gpiofunc", mlxbf3_gpiofunc_group_names, 1),
};
static int mlxbf3_pmx_get_funcs_count(struct pinctrl_dev *pctldev)
{
return ARRAY_SIZE(mlxbf3_pmx_funcs);
}
static const char *mlxbf3_pmx_get_func_name(struct pinctrl_dev *pctldev,
unsigned int selector)
{
return mlxbf3_pmx_funcs[selector].name;
}
static int mlxbf3_pmx_get_groups(struct pinctrl_dev *pctldev,
unsigned int selector,
const char * const **groups,
unsigned int * const num_groups)
{
*groups = mlxbf3_pmx_funcs[selector].groups;
*num_groups = MLXBF3_MAX_GPIO_PINS;
return 0;
}
static int mlxbf3_pmx_set(struct pinctrl_dev *pctldev,
unsigned int selector,
unsigned int group)
{
struct mlxbf3_pinctrl *priv = pinctrl_dev_get_drvdata(pctldev);
if (selector == MLXBF3_GPIO_HW_MODE) {
if (group < MLXBF3_NGPIOS_GPIO0)
writel(BIT(group), priv->fw_ctrl_clr0);
else
writel(BIT(group % MLXBF3_NGPIOS_GPIO0), priv->fw_ctrl_clr1);
}
if (selector == MLXBF3_GPIO_SW_MODE) {
if (group < MLXBF3_NGPIOS_GPIO0)
writel(BIT(group), priv->fw_ctrl_set0);
else
writel(BIT(group % MLXBF3_NGPIOS_GPIO0), priv->fw_ctrl_set1);
}
return 0;
}
static int mlxbf3_gpio_request_enable(struct pinctrl_dev *pctldev,
struct pinctrl_gpio_range *range,
unsigned int offset)
{
struct mlxbf3_pinctrl *priv = pinctrl_dev_get_drvdata(pctldev);
if (offset < MLXBF3_NGPIOS_GPIO0)
writel(BIT(offset), priv->fw_ctrl_set0);
else
writel(BIT(offset % MLXBF3_NGPIOS_GPIO0), priv->fw_ctrl_set1);
return 0;
}
static const struct pinmux_ops mlxbf3_pmx_ops = {
.get_functions_count = mlxbf3_pmx_get_funcs_count,
.get_function_name = mlxbf3_pmx_get_func_name,
.get_function_groups = mlxbf3_pmx_get_groups,
.set_mux = mlxbf3_pmx_set,
.gpio_request_enable = mlxbf3_gpio_request_enable,
};
static struct pinctrl_desc mlxbf3_pin_desc = {
.name = "pinctrl-mlxbf3",
.pins = mlxbf3_pins,
.npins = ARRAY_SIZE(mlxbf3_pins),
.pctlops = &mlxbf3_pinctrl_group_ops,
.pmxops = &mlxbf3_pmx_ops,
.owner = THIS_MODULE,
};
static_assert(ARRAY_SIZE(mlxbf3_pinctrl_single_group_names) == MLXBF3_MAX_GPIO_PINS);
static int mlxbf3_pinctrl_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct mlxbf3_pinctrl *priv;
int ret;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->dev = &pdev->dev;
priv->fw_ctrl_set0 = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(priv->fw_ctrl_set0))
return PTR_ERR(priv->fw_ctrl_set0);
priv->fw_ctrl_clr0 = devm_platform_ioremap_resource(pdev, 1);
if (IS_ERR(priv->fw_ctrl_set0))
return PTR_ERR(priv->fw_ctrl_set0);
priv->fw_ctrl_set1 = devm_platform_ioremap_resource(pdev, 2);
if (IS_ERR(priv->fw_ctrl_set0))
return PTR_ERR(priv->fw_ctrl_set0);
priv->fw_ctrl_clr1 = devm_platform_ioremap_resource(pdev, 3);
if (IS_ERR(priv->fw_ctrl_set0))
return PTR_ERR(priv->fw_ctrl_set0);
ret = devm_pinctrl_register_and_init(dev,
&mlxbf3_pin_desc,
priv,
&priv->pctl);
if (ret)
return dev_err_probe(dev, ret, "Failed to register pinctrl\n");
ret = pinctrl_enable(priv->pctl);
if (ret)
return dev_err_probe(dev, ret, "Failed to enable pinctrl\n");
pinctrl_add_gpio_ranges(priv->pctl, mlxbf3_pinctrl_gpio_ranges, 2);
return 0;
}
static const struct acpi_device_id mlxbf3_pinctrl_acpi_ids[] = {
{ "MLNXBF34", 0 },
{}
};
MODULE_DEVICE_TABLE(acpi, mlxbf3_pinctrl_acpi_ids);
static struct platform_driver mlxbf3_pinctrl_driver = {
.driver = {
.name = "pinctrl-mlxbf3",
.acpi_match_table = mlxbf3_pinctrl_acpi_ids,
},
.probe = mlxbf3_pinctrl_probe,
};
module_platform_driver(mlxbf3_pinctrl_driver);
MODULE_DESCRIPTION("NVIDIA pinctrl driver");
MODULE_AUTHOR("Asmaa Mnebhi <asmaa@nvidia.com>");
MODULE_LICENSE("Dual BSD/GPL");
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