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dmarc=pass (p=reject dis=none) header.from=bootlin.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=bootlin.com Received: by mail.gandi.net (Postfix) with ESMTPSA id AFC54FF80A; Tue, 17 Sep 2024 17:00:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1726592457; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=u0yQu9pDDnPyDQDkGXG+4FLvjOIFwjQz02Sl9KeBS80=; b=jruX6AeweMQx/Azgiz+WmJ+8pBOGeVmbsbC9jNY3U5rHyiiY3l3RGKIlZs9KCDJe9Z+hqX 6Q5bULs1v8WxBa7b+w9W/2RJCzBi1WirOYo4clJzzV/Em03PzKtGxQcxRl5R0fBzCGw3Fz zxcYt+IoRyIPGFdK90/kk6SNxTPcUCuanCd8pyRdAUifSm9Cq9xuIcx4lrZyonAOGtiPqb Grgpm7HgCbCNt2zjvqE1iIlGkDcY7bNqb+QfhPQx9yciJuOtzQCtL2jwqZ7IECeNeCdKqS AKfrAM20cbJjGzuiwBkTubrsziBqCytpjr5kelm84JANn0uySMyORzVcLaLhjA== From: Thomas Richard Date: Tue, 17 Sep 2024 19:00:48 +0200 Subject: [PATCH v2 2/5] gpio: Congatec Board Controller gpio driver Precedence: bulk X-Mailing-List: linux-gpio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240503-congatec-board-controller-v2-2-681511a01c8f@bootlin.com> References: <20240503-congatec-board-controller-v2-0-681511a01c8f@bootlin.com> In-Reply-To: <20240503-congatec-board-controller-v2-0-681511a01c8f@bootlin.com> To: Lee Jones , Linus Walleij , Bartosz Golaszewski , Andi Shyti , Wim Van Sebroeck , Guenter Roeck Cc: linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org, linux-i2c@vger.kernel.org, linux-watchdog@vger.kernel.org, thomas.petazzoni@bootlin.com, blake.vermeer@keysight.com, Thomas Richard X-Mailer: b4 0.12.0 X-GND-Sasl: thomas.richard@bootlin.com Add gpio support for the Congatec Board Controller. Signed-off-by: Thomas Richard Reviewed-by: Linus Walleij --- drivers/gpio/Kconfig | 10 +++ drivers/gpio/Makefile | 1 + drivers/gpio/gpio-cgbc.c | 196 +++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 207 insertions(+) diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index 58f43bcced7c..ce77bad40087 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -233,6 +233,16 @@ config GPIO_CADENCE help Say yes here to enable support for Cadence GPIO controller. +config GPIO_CGBC + tristate "Congatec Board Controller GPIO support" + depends on MFD_CGBC + help + Select this option to enable GPIO support for the Congatec Board + Controller. + + This driver can also be built as a module. If so, the module will be + called gpio-cgbc. + config GPIO_CLPS711X tristate "CLPS711X GPIO support" depends on ARCH_CLPS711X || COMPILE_TEST diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index 64dd6d9d730d..3a96e3c27a2d 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -44,6 +44,7 @@ obj-$(CONFIG_GPIO_BD9571MWV) += gpio-bd9571mwv.o obj-$(CONFIG_GPIO_BRCMSTB) += gpio-brcmstb.o obj-$(CONFIG_GPIO_BT8XX) += gpio-bt8xx.o obj-$(CONFIG_GPIO_CADENCE) += gpio-cadence.o +obj-$(CONFIG_GPIO_CGBC) += gpio-cgbc.o obj-$(CONFIG_GPIO_CLPS711X) += gpio-clps711x.o obj-$(CONFIG_GPIO_SNPS_CREG) += gpio-creg-snps.o obj-$(CONFIG_GPIO_CROS_EC) += gpio-cros-ec.o diff --git a/drivers/gpio/gpio-cgbc.c b/drivers/gpio/gpio-cgbc.c new file mode 100644 index 000000000000..bdd747cd7250 --- /dev/null +++ b/drivers/gpio/gpio-cgbc.c @@ -0,0 +1,196 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Congatec Board Controller GPIO driver + * + * Copyright (C) 2024 Bootlin + * Author: Thomas Richard + */ + +#include +#include +#include +#include +#include + +#define CGBC_GPIO_NGPIO 14 + +#define CGBC_GPIO_CMD_GET 0x64 +#define CGBC_GPIO_CMD_SET 0x65 +#define CGBC_GPIO_CMD_DIR_GET 0x66 +#define CGBC_GPIO_CMD_DIR_SET 0x67 + +struct cgbc_gpio_data { + struct gpio_chip chip; + struct cgbc_device_data *cgbc; + struct mutex lock; +}; + +static int cgbc_gpio_cmd(struct cgbc_device_data *cgbc, + u8 cmd0, u8 cmd1, u8 cmd2, u8 *value) +{ + u8 cmd[3] = {cmd0, cmd1, cmd2}; + + return cgbc_command(cgbc, cmd, sizeof(cmd), value, 1, NULL); +} + +static int cgbc_gpio_get(struct gpio_chip *chip, unsigned int offset) +{ + struct cgbc_gpio_data *gpio = gpiochip_get_data(chip); + struct cgbc_device_data *cgbc = gpio->cgbc; + int ret; + u8 val; + + scoped_guard(mutex, &gpio->lock) + ret = cgbc_gpio_cmd(cgbc, CGBC_GPIO_CMD_GET, (offset > 7) ? 1 : 0, 0, &val); + + offset %= 8; + + if (ret) + return ret; + else + return (int)(val & (u8)BIT(offset)); +} + +static void __cgbc_gpio_set(struct gpio_chip *chip, + unsigned int offset, int value) +{ + struct cgbc_gpio_data *gpio = gpiochip_get_data(chip); + struct cgbc_device_data *cgbc = gpio->cgbc; + u8 val; + int ret; + + ret = cgbc_gpio_cmd(cgbc, CGBC_GPIO_CMD_GET, (offset > 7) ? 1 : 0, 0, &val); + if (ret) + return; + + if (value) + val |= BIT(offset % 8); + else + val &= ~((u8)BIT(offset % 8)); + + cgbc_gpio_cmd(cgbc, CGBC_GPIO_CMD_SET, (offset > 7) ? 1 : 0, val, &val); +} + +static void cgbc_gpio_set(struct gpio_chip *chip, + unsigned int offset, int value) +{ + struct cgbc_gpio_data *gpio = gpiochip_get_data(chip); + + scoped_guard(mutex, &gpio->lock) + __cgbc_gpio_set(chip, offset, value); +} + +static int cgbc_gpio_direction_set(struct gpio_chip *chip, + unsigned int offset, int direction) +{ + struct cgbc_gpio_data *gpio = gpiochip_get_data(chip); + struct cgbc_device_data *cgbc = gpio->cgbc; + int ret; + u8 val; + + ret = cgbc_gpio_cmd(cgbc, CGBC_GPIO_CMD_DIR_GET, (offset > 7) ? 1 : 0, 0, &val); + if (ret) + goto end; + + if (direction == GPIO_LINE_DIRECTION_IN) + val &= ~((u8)BIT(offset % 8)); + else + val |= BIT(offset % 8); + + ret = cgbc_gpio_cmd(cgbc, CGBC_GPIO_CMD_DIR_SET, (offset > 7) ? 1 : 0, val, &val); + +end: + return ret; +} + +static int cgbc_gpio_direction_input(struct gpio_chip *chip, + unsigned int offset) +{ + struct cgbc_gpio_data *gpio = gpiochip_get_data(chip); + + guard(mutex)(&gpio->lock); + return cgbc_gpio_direction_set(chip, offset, GPIO_LINE_DIRECTION_IN); +} + +static int cgbc_gpio_direction_output(struct gpio_chip *chip, + unsigned int offset, int value) +{ + struct cgbc_gpio_data *gpio = gpiochip_get_data(chip); + + guard(mutex)(&gpio->lock); + + __cgbc_gpio_set(chip, offset, value); + return cgbc_gpio_direction_set(chip, offset, GPIO_LINE_DIRECTION_OUT); +} + +static int cgbc_gpio_get_direction(struct gpio_chip *chip, unsigned int offset) +{ + struct cgbc_gpio_data *gpio = gpiochip_get_data(chip); + struct cgbc_device_data *cgbc = gpio->cgbc; + int ret; + u8 val; + + scoped_guard(mutex, &gpio->lock) + ret = cgbc_gpio_cmd(cgbc, CGBC_GPIO_CMD_DIR_GET, (offset > 7) ? 1 : 0, 0, &val); + + if (ret) + return ret; + + if (val & BIT(offset % 8)) + return GPIO_LINE_DIRECTION_OUT; + else + return GPIO_LINE_DIRECTION_IN; +} + +static int cgbc_gpio_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct cgbc_device_data *cgbc = dev_get_drvdata(dev->parent); + struct cgbc_gpio_data *gpio; + struct gpio_chip *chip; + int ret; + + gpio = devm_kzalloc(dev, sizeof(*gpio), GFP_KERNEL); + if (!gpio) + return -ENOMEM; + + gpio->cgbc = cgbc; + + platform_set_drvdata(pdev, gpio); + + chip = &gpio->chip; + chip->label = dev_name(&pdev->dev); + chip->owner = THIS_MODULE; + chip->parent = dev; + chip->base = -1; + chip->direction_input = cgbc_gpio_direction_input; + chip->direction_output = cgbc_gpio_direction_output; + chip->get_direction = cgbc_gpio_get_direction; + chip->get = cgbc_gpio_get; + chip->set = cgbc_gpio_set; + chip->ngpio = CGBC_GPIO_NGPIO; + + ret = devm_mutex_init(dev, &gpio->lock); + if (ret) + return ret; + + ret = devm_gpiochip_add_data(dev, chip, gpio); + if (ret) + return dev_err_probe(dev, ret, "Could not register GPIO chip\n"); + + return 0; +} + +static struct platform_driver cgbc_gpio_driver = { + .driver = { + .name = "cgbc-gpio", + }, + .probe = cgbc_gpio_probe, +}; + +module_platform_driver(cgbc_gpio_driver); + +MODULE_DESCRIPTION("Congatec Board Controller GPIO Driver"); +MODULE_AUTHOR("Thomas Richard "); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:cgbc-gpio");