From patchwork Sun Apr 28 21:37:48 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Marek_Beh=C3=BAn?= X-Patchwork-Id: 10921061 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id EB6F114C0 for ; Sun, 28 Apr 2019 21:38:03 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C2AC3284AF for ; Sun, 28 Apr 2019 21:38:03 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 9D0C028703; Sun, 28 Apr 2019 21:38:03 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 8A783284AF for ; Sun, 28 Apr 2019 21:38:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=j9yfVprd8jk4a5GS+JBu2GaeJ3hIrpbVdv0V1FutGIU=; b=CDoyw7CXdXX/GS ctW9+9fdUd3gOijeg/PVxfjuKde8SS3hk+OIPTR41i0MkAl6x1KKR5pJqxgXU1KRLQhORT5I7noSX Z579ZIOwYKukahNyaI7QuLZBMvDibQVEAX0yR8eDqiIuQoa2S+4YPnmCrpu2rc6VlM5JY2c8H4nu5 fmoPxgoU0QLKkLGc4+BmzEFpdXBfMysR0qK2yDT2Vm+OBYwKI5I9+zKPlVaAvwd08PBFsdRvP8MaC QKhwud81ogOTtTJ0tBkjRd6/twx3Q8Ul8kWO5nMjPABbvdackvT7ppXx1xJtklXx4jY2nTk4DQDg7 SwSk3QSCDlPhELOVasbg==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1hKrUm-0000gp-A2; Sun, 28 Apr 2019 21:38:00 +0000 Received: from mail.nic.cz ([217.31.204.67]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1hKrUh-0000f2-W4 for linux-arm-kernel@lists.infradead.org; Sun, 28 Apr 2019 21:37:58 +0000 Received: from dellmb.labs.office.nic.cz (unknown [172.20.6.125]) by mail.nic.cz (Postfix) with ESMTP id 8002B63725; Sun, 28 Apr 2019 23:37:50 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=nic.cz; s=default; t=1556487470; bh=EDs1Fg5d1s3DSCcnyssNTPuWDfNEhZRY9ArwhwE+VvA=; h=From:To:Date; b=tlVd5SkstyRQJMdDdHibipIr60PMvzG68orCrfeKQF9bt/nOfxNsQPi2CSu5GJqdP 9QylPW6ghVOKwEnNUAofsLRrZAbmg7UER1GWDkGNEhyGb03MRN3JoqqoKEbDotAqUE vxJ0on0cNZ9OUZKCOZXDMrbW9GRIW+9XWBditLl4= From: =?utf-8?q?Marek_Beh=C3=BAn?= To: Olof Johansson Subject: [PATCH v5 armsoc/drivers/bus+gpio 4/5] drivers: gpio: Add support for GPIOs over Moxtet bus Date: Sun, 28 Apr 2019 23:37:48 +0200 Message-Id: <20190428213749.7017-5-marek.behun@nic.cz> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190428213749.7017-1-marek.behun@nic.cz> References: <20190428213749.7017-1-marek.behun@nic.cz> MIME-Version: 1.0 X-Virus-Scanned: clamav-milter 0.99.2 at mail X-Virus-Status: Clean X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190428_143756_368844_1FFB6D37 X-CRM114-Status: GOOD ( 16.94 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Linus Walleij , arm@kernel.org, linux-arm-kernel@lists.infradead.org, =?utf-8?q?Marek_Beh=C3=BAn?= Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP This adds support for interpreting the input and output bits of one device on Moxtet bus as GPIOs. This is needed for example by the SFP cage module of Turris Mox. Signed-off-by: Marek Behún Reviewed-by: Linus Walleij --- MAINTAINERS | 1 + drivers/gpio/Kconfig | 9 ++ drivers/gpio/Makefile | 1 + drivers/gpio/gpio-moxtet.c | 179 +++++++++++++++++++++++++++++++++++++ 4 files changed, 190 insertions(+) create mode 100644 drivers/gpio/gpio-moxtet.c diff --git a/MAINTAINERS b/MAINTAINERS index 9db8f74e1da7..c865bf742966 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -1546,6 +1546,7 @@ F: Documentation/ABI/testing/sysfs-bus-moxtet-devices F: Documentation/devicetree/bindings/bus/moxtet.txt F: include/linux/moxtet.h F: drivers/bus/moxtet.c +F: drivers/gpio/gpio-moxtet.c ARM/EBSA110 MACHINE SUPPORT M: Russell King diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index 3f50526a771f..4f567a2502f1 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -1424,6 +1424,15 @@ config GPIO_XRA1403 help GPIO driver for EXAR XRA1403 16-bit SPI-based GPIO expander. +config GPIO_MOXTET + tristate "Turris Mox Moxtet bus GPIO expander" + depends on MOXTET + help + Say yes here if you are building for the Turris Mox router. + This is the driver needed for configuring the GPIOs via the Moxtet + bus. For example the Mox module with SFP cage needs this driver + so that phylink can use corresponding GPIOs. + endmenu menu "USB GPIO expanders" diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index 54d55274b93a..8f20025daf50 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -88,6 +88,7 @@ obj-$(CONFIG_GPIO_MC9S08DZ60) += gpio-mc9s08dz60.o obj-$(CONFIG_GPIO_ML_IOH) += gpio-ml-ioh.o obj-$(CONFIG_GPIO_MM_LANTIQ) += gpio-mm-lantiq.o obj-$(CONFIG_GPIO_MOCKUP) += gpio-mockup.o +obj-$(CONFIG_GPIO_MOXTET) += gpio-moxtet.o obj-$(CONFIG_GPIO_MPC5200) += gpio-mpc5200.o obj-$(CONFIG_GPIO_MPC8XXX) += gpio-mpc8xxx.o obj-$(CONFIG_GPIO_MSIC) += gpio-msic.o diff --git a/drivers/gpio/gpio-moxtet.c b/drivers/gpio/gpio-moxtet.c new file mode 100644 index 000000000000..3fd729994a38 --- /dev/null +++ b/drivers/gpio/gpio-moxtet.c @@ -0,0 +1,179 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Turris Mox Moxtet GPIO expander + * + * Copyright (C) 2018 Marek Behun + */ + +#include +#include +#include +#include + +#define MOXTET_GPIO_NGPIOS 12 +#define MOXTET_GPIO_INPUTS 4 + +struct moxtet_gpio_desc { + u16 in_mask; + u16 out_mask; +}; + +static const struct moxtet_gpio_desc descs[] = { + [TURRIS_MOX_MODULE_SFP] = { + .in_mask = GENMASK(2, 0), + .out_mask = GENMASK(5, 4), + }, +}; + +struct moxtet_gpio_chip { + struct device *dev; + struct gpio_chip gpio_chip; + const struct moxtet_gpio_desc *desc; +}; + +static int moxtet_gpio_get_value(struct gpio_chip *gc, unsigned int offset) +{ + struct moxtet_gpio_chip *chip = gpiochip_get_data(gc); + int ret; + + if (chip->desc->in_mask & BIT(offset)) { + ret = moxtet_device_read(chip->dev); + } else if (chip->desc->out_mask & BIT(offset)) { + ret = moxtet_device_written(chip->dev); + if (ret >= 0) + ret <<= MOXTET_GPIO_INPUTS; + } else { + return -EINVAL; + } + + if (ret < 0) + return ret; + + return !!(ret & BIT(offset)); +} + +static void moxtet_gpio_set_value(struct gpio_chip *gc, unsigned int offset, + int val) +{ + struct moxtet_gpio_chip *chip = gpiochip_get_data(gc); + int state; + + state = moxtet_device_written(chip->dev); + if (state < 0) + return; + + offset -= MOXTET_GPIO_INPUTS; + + if (val) + state |= BIT(offset); + else + state &= ~BIT(offset); + + moxtet_device_write(chip->dev, state); +} + +static int moxtet_gpio_get_direction(struct gpio_chip *gc, unsigned int offset) +{ + struct moxtet_gpio_chip *chip = gpiochip_get_data(gc); + + /* All lines are hard wired to be either input or output, not both. */ + if (chip->desc->in_mask & BIT(offset)) + return 1; + else if (chip->desc->out_mask & BIT(offset)) + return 0; + else + return -EINVAL; +} + +static int moxtet_gpio_direction_input(struct gpio_chip *gc, + unsigned int offset) +{ + struct moxtet_gpio_chip *chip = gpiochip_get_data(gc); + + if (chip->desc->in_mask & BIT(offset)) + return 0; + else if (chip->desc->out_mask & BIT(offset)) + return -ENOTSUPP; + else + return -EINVAL; +} + +static int moxtet_gpio_direction_output(struct gpio_chip *gc, + unsigned int offset, int val) +{ + struct moxtet_gpio_chip *chip = gpiochip_get_data(gc); + + if (chip->desc->out_mask & BIT(offset)) + moxtet_gpio_set_value(gc, offset, val); + else if (chip->desc->in_mask & BIT(offset)) + return -ENOTSUPP; + else + return -EINVAL; + + return 0; +} + +static int moxtet_gpio_probe(struct device *dev) +{ + struct moxtet_gpio_chip *chip; + struct device_node *nc = dev->of_node; + int id; + + id = to_moxtet_device(dev)->id; + + if (id >= ARRAY_SIZE(descs)) { + dev_err(dev, "%pOF Moxtet device id 0x%x is not supported by gpio-moxtet driver\n", + nc, id); + return -ENOTSUPP; + } + + chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL); + if (!chip) + return -ENOMEM; + + chip->dev = dev; + chip->gpio_chip.parent = dev; + chip->desc = &descs[id]; + + dev_set_drvdata(dev, chip); + + chip->gpio_chip.label = dev_name(dev); + chip->gpio_chip.get_direction = moxtet_gpio_get_direction; + chip->gpio_chip.direction_input = moxtet_gpio_direction_input; + chip->gpio_chip.direction_output = moxtet_gpio_direction_output; + chip->gpio_chip.get = moxtet_gpio_get_value; + chip->gpio_chip.set = moxtet_gpio_set_value; + chip->gpio_chip.base = -1; + + chip->gpio_chip.ngpio = MOXTET_GPIO_NGPIOS; + + chip->gpio_chip.can_sleep = true; + chip->gpio_chip.owner = THIS_MODULE; + + return devm_gpiochip_add_data(dev, &chip->gpio_chip, chip); +} + +static const struct of_device_id moxtet_gpio_dt_ids[] = { + { .compatible = "cznic,moxtet-gpio", }, + {}, +}; +MODULE_DEVICE_TABLE(of, moxtet_gpio_dt_ids); + +static const enum turris_mox_module_id moxtet_gpio_module_table[] = { + TURRIS_MOX_MODULE_SFP, + 0, +}; + +static struct moxtet_driver moxtet_gpio_driver = { + .driver = { + .name = "moxtet-gpio", + .of_match_table = moxtet_gpio_dt_ids, + .probe = moxtet_gpio_probe, + }, + .id_table = moxtet_gpio_module_table, +}; +module_moxtet_driver(moxtet_gpio_driver); + +MODULE_AUTHOR("Marek Behun "); +MODULE_DESCRIPTION("Turris Mox Moxtet GPIO expander"); +MODULE_LICENSE("GPL v2");