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Fri, 10 Feb 2023 07:39:47 -0800 From: Asmaa Mnebhi To: , , CC: Asmaa Mnebhi Subject: [PATCH v3 1/2] Support NVIDIA BlueField-3 GPIO controller Date: Fri, 10 Feb 2023 10:39:40 -0500 Message-ID: X-Mailer: git-send-email 2.30.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN8NAM11FT050:EE_|BL1PR12MB5110:EE_ X-MS-Office365-Filtering-Correlation-Id: 541a6598-8ff0-481f-76ce-08db0b7d0c85 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.118.233;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc7edge2.nvidia.com;CAT:NONE;SFS:(13230025)(4636009)(396003)(136003)(346002)(39860400002)(376002)(451199018)(36840700001)(40470700004)(46966006)(5660300002)(36756003)(82740400003)(356005)(41300700001)(36860700001)(7636003)(82310400005)(107886003)(86362001)(2616005)(2906002)(83380400001)(47076005)(40460700003)(336012)(426003)(186003)(8936002)(26005)(6666004)(110136005)(40480700001)(450100002)(316002)(478600001)(8676002)(4326008)(70586007)(7696005)(70206006);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Feb 2023 15:39:51.0073 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 541a6598-8ff0-481f-76ce-08db0b7d0c85 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.233];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BN8NAM11FT050.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL1PR12MB5110 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch adds support for the BlueField-3 SoC GPIO driver which allows: - setting certain GPIOs as interrupts from other dependent drivers - ability to manipulate certain GPIO pins via libgpiod tools BlueField-3 has 56 GPIOs but the user is only allowed to change some of them into GPIO mode. Use valid_mask to make it impossible to alter the rest of the GPIOs. Signed-off-by: Asmaa Mnebhi --- drivers/gpio/Kconfig | 7 + drivers/gpio/Makefile | 1 + drivers/gpio/gpio-mlxbf3.c | 262 +++++++++++++++++++++++++++++++++++++ 3 files changed, 270 insertions(+) create mode 100644 drivers/gpio/gpio-mlxbf3.c diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index ec7cfd4f52b1..3d56a83db284 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -1534,6 +1534,13 @@ config GPIO_MLXBF2 help Say Y here if you want GPIO support on Mellanox BlueField 2 SoC. +config GPIO_MLXBF3 + tristate "Mellanox BlueField 3 SoC GPIO" + depends on (MELLANOX_PLATFORM && ARM64 && ACPI) || (64BIT && COMPILE_TEST) + select GPIO_GENERIC + help + Say Y here if you want GPIO support on Mellanox BlueField 3 SoC. + config GPIO_ML_IOH tristate "OKI SEMICONDUCTOR ML7213 IOH GPIO support" depends on X86 || COMPILE_TEST diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index 010587025fc8..76545ca31457 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -101,6 +101,7 @@ obj-$(CONFIG_GPIO_MERRIFIELD) += gpio-merrifield.o obj-$(CONFIG_GPIO_ML_IOH) += gpio-ml-ioh.o obj-$(CONFIG_GPIO_MLXBF) += gpio-mlxbf.o obj-$(CONFIG_GPIO_MLXBF2) += gpio-mlxbf2.o +obj-$(CONFIG_GPIO_MLXBF3) += gpio-mlxbf3.o obj-$(CONFIG_GPIO_MM_LANTIQ) += gpio-mm-lantiq.o obj-$(CONFIG_GPIO_MOCKUP) += gpio-mockup.o obj-$(CONFIG_GPIO_MOXTET) += gpio-moxtet.o diff --git a/drivers/gpio/gpio-mlxbf3.c b/drivers/gpio/gpio-mlxbf3.c new file mode 100644 index 000000000000..ddd27c316035 --- /dev/null +++ b/drivers/gpio/gpio-mlxbf3.c @@ -0,0 +1,262 @@ +// SPDX-License-Identifier: GPL-2.0-only or BSD-3-Clause + +/* + * Copyright (C) 2022 NVIDIA CORPORATION & AFFILIATES + */ + +#include +#include +#include + +/* + * There are 2 YU GPIO blocks: + * gpio[0]: HOST_GPIO0->HOST_GPIO31 + * gpio[1]: HOST_GPIO32->HOST_GPIO55 + */ +#define MLXBF3_GPIO_MAX_PINS_PER_BLOCK 32 + +/* + * fw_gpio[x] block registers and their offset + */ +#define MLXBF_GPIO_FW_OUTPUT_ENABLE_SET 0x04 +#define MLXBF_GPIO_FW_DATA_OUT_SET 0x08 +#define MLXBF_GPIO_FW_OUTPUT_ENABLE_CLEAR 0x18 +#define MLXBF_GPIO_FW_DATA_OUT_CLEAR 0x1c +#define MLXBF_GPIO_CAUSE_RISE_EN 0x28 +#define MLXBF_GPIO_CAUSE_FALL_EN 0x2c +#define MLXBF_GPIO_READ_DATA_IN 0x30 + +#define MLXBF_GPIO_CAUSE_OR_CAUSE_EVTEN0 0x00 +#define MLXBF_GPIO_CAUSE_OR_EVTEN0 0x14 +#define MLXBF_GPIO_CAUSE_OR_CLRCAUSE 0x18 + +struct mlxbf3_gpio_context { + struct gpio_chip gc; + struct irq_chip irq_chip; + + /* YU GPIO block address */ + void __iomem *gpio_io; + + /* YU GPIO cause block address */ + void __iomem *gpio_cause_io; + + /* Mask of valid gpios that can be accessed by software */ + unsigned int valid_mask; +}; + +static void mlxbf3_gpio_irq_enable(struct irq_data *irqd) +{ + struct gpio_chip *gc = irq_data_get_irq_chip_data(irqd); + struct mlxbf3_gpio_context *gs = gpiochip_get_data(gc); + int offset = irqd_to_hwirq(irqd); + unsigned long flags; + u32 val; + + raw_spin_lock_irqsave(&gs->gc.bgpio_lock, flags); + writel(BIT(offset), gs->gpio_cause_io + MLXBF_GPIO_CAUSE_OR_CLRCAUSE); + + val = readl(gs->gpio_cause_io + MLXBF_GPIO_CAUSE_OR_EVTEN0); + val |= BIT(offset); + writel(val, gs->gpio_cause_io + MLXBF_GPIO_CAUSE_OR_EVTEN0); + raw_spin_unlock_irqrestore(&gs->gc.bgpio_lock, flags); +} + +static void mlxbf3_gpio_irq_disable(struct irq_data *irqd) +{ + struct gpio_chip *gc = irq_data_get_irq_chip_data(irqd); + struct mlxbf3_gpio_context *gs = gpiochip_get_data(gc); + int offset = irqd_to_hwirq(irqd); + unsigned long flags; + u32 val; + + raw_spin_lock_irqsave(&gs->gc.bgpio_lock, flags); + val = readl(gs->gpio_cause_io + MLXBF_GPIO_CAUSE_OR_EVTEN0); + val &= ~BIT(offset); + writel(val, gs->gpio_cause_io + MLXBF_GPIO_CAUSE_OR_EVTEN0); + raw_spin_unlock_irqrestore(&gs->gc.bgpio_lock, flags); +} + +static irqreturn_t mlxbf3_gpio_irq_handler(int irq, void *ptr) +{ + struct mlxbf3_gpio_context *gs = ptr; + struct gpio_chip *gc = &gs->gc; + unsigned long pending; + u32 level; + + pending = readl(gs->gpio_cause_io + MLXBF_GPIO_CAUSE_OR_CAUSE_EVTEN0); + writel(pending, gs->gpio_cause_io + MLXBF_GPIO_CAUSE_OR_CLRCAUSE); + + for_each_set_bit(level, &pending, gc->ngpio) + generic_handle_irq(irq_find_mapping(gc->irq.domain, level)); + + return IRQ_RETVAL(pending); +} + +static int +mlxbf3_gpio_irq_set_type(struct irq_data *irqd, unsigned int type) +{ + struct gpio_chip *gc = irq_data_get_irq_chip_data(irqd); + struct mlxbf3_gpio_context *gs = gpiochip_get_data(gc); + int offset = irqd_to_hwirq(irqd); + unsigned long flags; + bool fall = false; + bool rise = false; + u32 val; + + switch (type & IRQ_TYPE_SENSE_MASK) { + case IRQ_TYPE_EDGE_BOTH: + fall = true; + rise = true; + break; + case IRQ_TYPE_EDGE_RISING: + rise = true; + break; + case IRQ_TYPE_EDGE_FALLING: + fall = true; + break; + default: + return -EINVAL; + } + + raw_spin_lock_irqsave(&gs->gc.bgpio_lock, flags); + if (fall) { + val = readl(gs->gpio_io + MLXBF_GPIO_CAUSE_FALL_EN); + val |= BIT(offset); + writel(val, gs->gpio_io + MLXBF_GPIO_CAUSE_FALL_EN); + } + + if (rise) { + val = readl(gs->gpio_io + MLXBF_GPIO_CAUSE_RISE_EN); + val |= BIT(offset); + writel(val, gs->gpio_io + MLXBF_GPIO_CAUSE_RISE_EN); + } + raw_spin_unlock_irqrestore(&gs->gc.bgpio_lock, flags); + + return 0; +} + +static int mlxbf3_gpio_init_valid_mask(struct gpio_chip *gc, + unsigned long *valid_mask, + unsigned int ngpios) +{ + struct mlxbf3_gpio_context *gs = gpiochip_get_data(gc); + + *valid_mask = gs->valid_mask; + + return 0; +} + +static int +mlxbf3_gpio_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct mlxbf3_gpio_context *gs; + unsigned int npins, valid_mask; + struct gpio_irq_chip *girq; + struct gpio_chip *gc; + struct resource *res; + const char *name; + int ret, irq; + + name = dev_name(dev); + + gs = devm_kzalloc(dev, sizeof(*gs), GFP_KERNEL); + if (!gs) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) + return -ENODEV; + + /* Resource shared with pinctrl driver */ + gs->gpio_io = devm_ioremap(dev, res->start, resource_size(res)); + if (!gs->gpio_io) + return -ENOMEM; + + /* YU GPIO block address */ + gs->gpio_cause_io = devm_platform_ioremap_resource(pdev, 1); + if (IS_ERR(gs->gpio_cause_io)) + return PTR_ERR(gs->gpio_cause_io); + + if (device_property_read_u32(dev, "npins", &npins)) + npins = MLXBF3_GPIO_MAX_PINS_PER_BLOCK; + + if (device_property_read_u32(dev, "valid_mask", &valid_mask)) + valid_mask = 0x0; + + gs->valid_mask = valid_mask; + + gc = &gs->gc; + + ret = bgpio_init(gc, dev, 4, + gs->gpio_io + MLXBF_GPIO_READ_DATA_IN, + gs->gpio_io + MLXBF_GPIO_FW_DATA_OUT_SET, + gs->gpio_io + MLXBF_GPIO_FW_DATA_OUT_CLEAR, + gs->gpio_io + MLXBF_GPIO_FW_OUTPUT_ENABLE_SET, + gs->gpio_io + MLXBF_GPIO_FW_OUTPUT_ENABLE_CLEAR, 0); + + gc->request = gpiochip_generic_request; + gc->free = gpiochip_generic_free; + gc->init_valid_mask = mlxbf3_gpio_init_valid_mask; + + gc->ngpio = npins; + gc->owner = THIS_MODULE; + + irq = platform_get_irq(pdev, 0); + if (irq >= 0) { + gs->irq_chip.name = name; + gs->irq_chip.irq_set_type = mlxbf3_gpio_irq_set_type; + gs->irq_chip.irq_enable = mlxbf3_gpio_irq_enable; + gs->irq_chip.irq_disable = mlxbf3_gpio_irq_disable; + + girq = &gs->gc.irq; + girq->chip = &gs->irq_chip; + girq->handler = handle_simple_irq; + girq->default_type = IRQ_TYPE_NONE; + /* This will let us handle the parent IRQ in the driver */ + girq->num_parents = 0; + girq->parents = NULL; + girq->parent_handler = NULL; + + /* + * Directly request the irq here instead of passing + * a flow-handler because the irq is shared. + */ + ret = devm_request_irq(dev, irq, mlxbf3_gpio_irq_handler, + IRQF_SHARED, name, gs); + if (ret) { + dev_err(dev, "failed to request IRQ"); + return ret; + } + } + + platform_set_drvdata(pdev, gs); + + ret = devm_gpiochip_add_data(dev, &gs->gc, gs); + if (ret) { + dev_err(dev, "Failed adding memory mapped gpiochip\n"); + return ret; + } + + return 0; +} + +static const struct acpi_device_id __maybe_unused mlxbf3_gpio_acpi_match[] = { + { "MLNXBF33", 0 }, + {}, +}; +MODULE_DEVICE_TABLE(acpi, mlxbf3_gpio_acpi_match); + +static struct platform_driver mlxbf3_gpio_driver = { + .driver = { + .name = "mlxbf3_gpio", + .acpi_match_table = mlxbf3_gpio_acpi_match, + }, + .probe = mlxbf3_gpio_probe, +}; + +module_platform_driver(mlxbf3_gpio_driver); + +MODULE_DESCRIPTION("NVIDIA BlueField-3 GPIO Driver"); +MODULE_AUTHOR("Asmaa Mnebhi "); +MODULE_LICENSE("Dual BSD/GPL"); -- 2.30.1