From patchwork Wed Oct 26 17:28:43 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Asmaa Mnebhi X-Patchwork-Id: 13020926 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A17F3FA373E for ; Wed, 26 Oct 2022 17:36:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234139AbiJZRgC (ORCPT ); Wed, 26 Oct 2022 13:36:02 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57012 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229995AbiJZRf5 (ORCPT ); Wed, 26 Oct 2022 13:35:57 -0400 Received: from mellanox.co.il (mail-il-dmz.mellanox.com [193.47.165.129]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 7AF69C7057 for ; Wed, 26 Oct 2022 10:35:53 -0700 (PDT) Received: from Internal Mail-Server by MTLPINE1 (envelope-from asmaa@mellanox.com) with SMTP; 26 Oct 2022 20:29:06 +0300 Received: from bu-vnc02.mtbu.labs.mlnx (bu-vnc02.mtbu.labs.mlnx [10.15.2.65]) by mtbu-labmailer.labs.mlnx (8.14.4/8.14.4) with ESMTP id 29QHSxgY015430; Wed, 26 Oct 2022 13:28:59 -0400 Received: (from asmaa@localhost) by bu-vnc02.mtbu.labs.mlnx (8.14.7/8.13.8/Submit) id 29QHSx2W027361; Wed, 26 Oct 2022 13:28:59 -0400 From: Asmaa Mnebhi To: linus.walleij@linaro.org, linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, andy.shevchenko@gmail.com, bgolaszewski@baylibre.com, linux-acpi@vger.kernel.org Cc: Asmaa Mnebhi Subject: [PATCH v1 2/2] Support NVIDIA BlueField-3 pinctrl driver Date: Wed, 26 Oct 2022 13:28:43 -0400 Message-Id: <20221026172843.27236-3-asmaa@nvidia.com> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20221026172843.27236-1-asmaa@nvidia.com> References: <20221026172843.27236-1-asmaa@nvidia.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org This patch adds support to the BlueField-3 SoC pin controller. It allows muxing individual GPIOs to switch from the default hardware mode to software controlled mode. Signed-off-by: Asmaa Mnebhi --- drivers/pinctrl/Kconfig | 9 + drivers/pinctrl/Makefile | 1 + drivers/pinctrl/pinctrl-mlxbf.c | 353 ++++++++++++++++++++++++++++++++ 3 files changed, 363 insertions(+) create mode 100644 drivers/pinctrl/pinctrl-mlxbf.c diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig index f71fefff400f..caeef68cf51e 100644 --- a/drivers/pinctrl/Kconfig +++ b/drivers/pinctrl/Kconfig @@ -512,6 +512,15 @@ config PINCTRL_ZYNQMP This driver can also be built as a module. If so, the module will be called pinctrl-zynqmp. +config PINCTRL_MLXBF + tristate "NVIDIA BlueField-3 SoC Pinctrl driver" + depends on (MELLANOX_PLATFORM && ARM64 && ACPI) + select PINMUX + select GPIOLIB + select GPIOLIB_IRQCHIP + help + This selects the pinctrl driver for BlueField-3 SoCs. + source "drivers/pinctrl/actions/Kconfig" source "drivers/pinctrl/aspeed/Kconfig" source "drivers/pinctrl/bcm/Kconfig" diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile index 89bfa01b5231..e4497078146e 100644 --- a/drivers/pinctrl/Makefile +++ b/drivers/pinctrl/Makefile @@ -35,6 +35,7 @@ obj-$(CONFIG_PINCTRL_MCP23S08_I2C) += pinctrl-mcp23s08_i2c.o obj-$(CONFIG_PINCTRL_MCP23S08_SPI) += pinctrl-mcp23s08_spi.o obj-$(CONFIG_PINCTRL_MCP23S08) += pinctrl-mcp23s08.o obj-$(CONFIG_PINCTRL_MICROCHIP_SGPIO) += pinctrl-microchip-sgpio.o +obj-$(CONFIG_PINCTRL_MLXBF) += pinctrl-mlxbf.o obj-$(CONFIG_PINCTRL_OCELOT) += pinctrl-ocelot.o obj-$(CONFIG_PINCTRL_OXNAS) += pinctrl-oxnas.o obj-$(CONFIG_PINCTRL_PALMAS) += pinctrl-palmas.o diff --git a/drivers/pinctrl/pinctrl-mlxbf.c b/drivers/pinctrl/pinctrl-mlxbf.c new file mode 100644 index 000000000000..6304a66f0290 --- /dev/null +++ b/drivers/pinctrl/pinctrl-mlxbf.c @@ -0,0 +1,353 @@ +// SPDX-License-Identifier: GPL-2.0-only or BSD-3-Clause + +/* + * Copyright (C) 2022 NVIDIA CORPORATION & AFFILIATES + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include + +#include "core.h" + +#define MLXBF_GPIO0_FW_CONTROL_SET 0 +#define MLXBF_GPIO0_FW_CONTROL_CLEAR 0x14 +#define MLXBF_GPIO1_FW_CONTROL_SET 0x80 +#define MLXBF_GPIO1_FW_CONTROL_CLEAR 0x94 + +#define MLXBF_NGPIOS_GPIO0 32 + +enum { + MLXBF_GPIO_HW_MODE, + MLXBF_GPIO_SW_MODE +}; + +struct mlxbf_pinctrl { + void __iomem *base; + struct device *dev; + struct pinctrl_dev *pctl; + struct pinctrl_gpio_range gpio_range; +}; + +#define MLXBF_GPIO_RANGE(_id, _pinbase, _gpiobase, _npins) \ + { \ + .name = "mlxbf_gpio_range", \ + .id = _id, \ + .base = _gpiobase, \ + .pin_base = _pinbase, \ + .npins = _npins, \ + } + +static struct pinctrl_gpio_range mlxbf_pinctrl_gpio_ranges[] = { + MLXBF_GPIO_RANGE(0, 0, 480, 32), + MLXBF_GPIO_RANGE(1, 32, 456, 24), +}; + +static const struct pinctrl_pin_desc mlxbf_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 mlxbf_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" +}; + +/* Set of pin numbers for single-pin groups */ +static const unsigned int mlxbf_pinctrl_single_group_pins[] = { + 0, 1, 2, 3, 4, 5, 6, + 7, 8, 9, 10, 11, 12, 13, + 14, 15, 16, 17, 18, 19, 20, + 21, 22, 23, 24, 25, 26, 27, + 28, 29, 30, 31, 32, 33, 34, + 35, 36, 37, 38, 39, 40, 41, + 42, 43, 44, 45, 46, 47, 48, + 49, 50, 51, 52, 53, 54, 55, +}; + +static int mlxbf_get_groups_count(struct pinctrl_dev *pctldev) +{ + /* Number single-pin groups */ + return ARRAY_SIZE(mlxbf_pinctrl_single_group_pins); +} + +static const char *mlxbf_get_group_name(struct pinctrl_dev *pctldev, + unsigned int selector) +{ + return mlxbf_pinctrl_single_group_names[selector]; +} + +static int mlxbf_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 = &mlxbf_pinctrl_single_group_pins[selector]; + *num_pins = 1; + + return 0; +} + +static const struct pinctrl_ops mlxbf_pinctrl_group_ops = { + .get_groups_count = mlxbf_get_groups_count, + .get_group_name = mlxbf_get_group_name, + .get_group_pins = mlxbf_get_group_pins, +}; + +static const char * const mlxbf_gpiofunc_group_names[] = { "swctrl" }; +static const char * const mlxbf_hwfunc_group_names[] = { "hwctrl" }; + +/* + * Only 2 functions are supported which apply to all pins: + * 1) Possible default hardware functionality + * 2) Software controlled GPIO + */ +static const struct { + const char *name; + const char * const *group_names; +} mlxbf_pmx_funcs[] = { + { + .name = "hwfunc", + .group_names = mlxbf_hwfunc_group_names + }, + { + .name = "gpiofunc", + .group_names = mlxbf_gpiofunc_group_names + }, +}; + +static int mlxbf_pmx_get_funcs_count(struct pinctrl_dev *pctldev) +{ + return ARRAY_SIZE(mlxbf_pmx_funcs); +} + +static const char *mlxbf_pmx_get_func_name(struct pinctrl_dev *pctldev, + unsigned int selector) +{ + return mlxbf_pmx_funcs[selector].name; +} + +static int mlxbf_pmx_get_groups(struct pinctrl_dev *pctldev, + unsigned int selector, + const char * const **groups, + unsigned int * const num_groups) +{ + *groups = mlxbf_pmx_funcs[selector].group_names; + /* The function where "software has control over a GPIO" is available to all gpio pins */ + *num_groups = ARRAY_SIZE(mlxbf_pinctrl_single_group_pins); + + return 0; +} + +static int mlxbf_pmx_set(struct pinctrl_dev *pctldev, + unsigned int selector, + unsigned int group) +{ + struct mlxbf_pinctrl *priv = pinctrl_dev_get_drvdata(pctldev); + + if (selector == MLXBF_GPIO_HW_MODE) { + if (group < MLXBF_NGPIOS_GPIO0) + writel(BIT(group), priv->base + MLXBF_GPIO0_FW_CONTROL_CLEAR); + else + writel(BIT(group % MLXBF_NGPIOS_GPIO0), priv->base + MLXBF_GPIO1_FW_CONTROL_CLEAR); + } + + if (selector == MLXBF_GPIO_SW_MODE) { + if (group < MLXBF_NGPIOS_GPIO0) + writel(BIT(group), priv->base + MLXBF_GPIO0_FW_CONTROL_SET); + else + writel(BIT(group % MLXBF_NGPIOS_GPIO0), priv->base + MLXBF_GPIO1_FW_CONTROL_SET); + } + + return 0; +} + +static int mlxbf_gpio_request_enable(struct pinctrl_dev *pctldev, + struct pinctrl_gpio_range *range, + unsigned int offset) +{ + struct mlxbf_pinctrl *priv = pinctrl_dev_get_drvdata(pctldev); + + if (offset < MLXBF_NGPIOS_GPIO0) + writel(BIT(offset), priv->base + MLXBF_GPIO0_FW_CONTROL_SET); + else + writel(BIT(offset % MLXBF_NGPIOS_GPIO0), priv->base + MLXBF_GPIO1_FW_CONTROL_SET); + + return 0; +} + +static void mlxbf_gpio_disable_free(struct pinctrl_dev *pctldev, + struct pinctrl_gpio_range *range, + unsigned int offset) +{ + struct mlxbf_pinctrl *priv = pinctrl_dev_get_drvdata(pctldev); + + /* disable GPIO functionality by giving control back to hardware */ + if (offset < MLXBF_NGPIOS_GPIO0) + writel(BIT(offset), priv->base + MLXBF_GPIO0_FW_CONTROL_CLEAR); + else + writel(BIT(offset % MLXBF_NGPIOS_GPIO0), priv->base + MLXBF_GPIO1_FW_CONTROL_CLEAR); + +} + +static const struct pinmux_ops mlxbf_pmx_ops = { + .get_functions_count = mlxbf_pmx_get_funcs_count, + .get_function_name = mlxbf_pmx_get_func_name, + .get_function_groups = mlxbf_pmx_get_groups, + .set_mux = mlxbf_pmx_set, + .gpio_request_enable = mlxbf_gpio_request_enable, + .gpio_disable_free = mlxbf_gpio_disable_free, +}; + +static struct pinctrl_desc mlxbf_pin_desc = { + .name = "pinctrl-mlxbf", + .pins = mlxbf_pins, + .npins = ARRAY_SIZE(mlxbf_pins), + .pctlops = &mlxbf_pinctrl_group_ops, + .pmxops = &mlxbf_pmx_ops, + .owner = THIS_MODULE, +}; + +static int mlxbf_pinctrl_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct mlxbf_pinctrl *priv; + struct resource *res; + int ret; + + BUILD_BUG_ON(ARRAY_SIZE(mlxbf_pinctrl_single_group_names) != + ARRAY_SIZE(mlxbf_pinctrl_single_group_pins)); + + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->dev = &pdev->dev; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) + return -ENODEV; + + priv->base = devm_ioremap(dev, res->start, resource_size(res)); + if (!priv->base) + return -ENOMEM; + + ret = devm_pinctrl_register_and_init(priv->dev, + &mlxbf_pin_desc, + priv, + &priv->pctl); + if (ret) { + dev_err(priv->dev, "Failed pinctrl register (%d)\n", ret); + return ret; + } + + ret = pinctrl_enable(priv->pctl); + if (ret) { + dev_err(priv->dev, "Failed to enable pinctrl (%d)\n", ret); + return ret; + } + + pinctrl_add_gpio_range(priv->pctl, &mlxbf_pinctrl_gpio_ranges[0]); + pinctrl_add_gpio_range(priv->pctl, &mlxbf_pinctrl_gpio_ranges[1]); + + return 0; +} + +static const struct acpi_device_id mlxbf_pinctrl_acpi_ids[] = { + { "MLNXBF34", 0 }, + {}, +}; +MODULE_DEVICE_TABLE(acpi, mlxbf_pinctrl_acpi_ids); + +static struct platform_driver mlxbf_pinctrl_driver = { + .driver = { + .name = "pinctrl-mlxbf", + .acpi_match_table = mlxbf_pinctrl_acpi_ids, + }, + .probe = mlxbf_pinctrl_probe, +}; + +module_platform_driver(mlxbf_pinctrl_driver); + +MODULE_DESCRIPTION("NVIDIA pinctrl driver"); +MODULE_AUTHOR("Asmaa Mnebhi "); +MODULE_LICENSE("Dual BSD/GPL");