diff options
Diffstat (limited to 'drivers/pinctrl/pinctrl-mlxbf3.c')
| -rw-r--r-- | drivers/pinctrl/pinctrl-mlxbf3.c | 320 |
1 files changed, 320 insertions, 0 deletions
diff --git a/drivers/pinctrl/pinctrl-mlxbf3.c b/drivers/pinctrl/pinctrl-mlxbf3.c new file mode 100644 index 000000000000..3698f7bbd88d --- /dev/null +++ b/drivers/pinctrl/pinctrl-mlxbf3.c @@ -0,0 +1,320 @@ +// 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" }; + +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 void mlxbf3_gpio_disable_free(struct pinctrl_dev *pctldev, + struct pinctrl_gpio_range *range, + unsigned int offset) +{ + struct mlxbf3_pinctrl *priv = pinctrl_dev_get_drvdata(pctldev); + + /* disable GPIO functionality by giving control back to hardware */ + if (offset < MLXBF3_NGPIOS_GPIO0) + writel(BIT(offset), priv->fw_ctrl_clr0); + else + writel(BIT(offset % MLXBF3_NGPIOS_GPIO0), priv->fw_ctrl_clr1); +} + +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, + .gpio_disable_free = mlxbf3_gpio_disable_free, +}; + +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"); |