From patchwork Fri Apr 3 21:16:04 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Joachim Eastwood X-Patchwork-Id: 458072 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id EAD7314010F for ; Sat, 4 Apr 2015 08:16:48 +1100 (AEDT) Authentication-Results: ozlabs.org; dkim=fail reason="verification failed; unprotected key" header.d=gmail.com header.i=@gmail.com header.b=u4xh+7XH; dkim-adsp=none (unprotected policy); dkim-atps=neutral Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752519AbbDCVQr (ORCPT ); Fri, 3 Apr 2015 17:16:47 -0400 Received: from mail-la0-f50.google.com ([209.85.215.50]:35123 "EHLO mail-la0-f50.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752483AbbDCVQp (ORCPT ); Fri, 3 Apr 2015 17:16:45 -0400 Received: by lahf3 with SMTP id f3so85667841lah.2; Fri, 03 Apr 2015 14:16:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=0cGIz31/Gb2B5z2C/iIDU3yePxrSUbXo425c/ubRWT0=; b=u4xh+7XHDszoEII+E50gPaT6Pt5lbevLLVpN0+nsLfB3K7r259cJUsKIGlIZoDP+6l IgXpYVmMlIM9Tg61OyzELTxKmNMLAW7+mqKotU1ozH2Ofd/YZT2ttldhoXcr4ljemWao nJ/7/4XIMbkQ+tH/IK8jfCmYXO7mzWkyUQZ8S7WxDgVQpE+Em5HybIj4wzi7txBDoO4p imBr/btzR4yqXGLRjA6PTRlj3q+k56fg9fuTwNNSln2OgLZ4vIRmkpZpVkAt2rtLzfbI EpB5cMYu3iCTbLdxHohRacJbRKDfceoUl2tcCrpGkL2YTmsBX/sFK+ZASJ5/EOguoRt+ +R3Q== X-Received: by 10.152.120.202 with SMTP id le10mr3600381lab.115.1428095803541; Fri, 03 Apr 2015 14:16:43 -0700 (PDT) Received: from localhost.localdomain ([90.149.48.183]) by mx.google.com with ESMTPSA id lf12sm1015786lac.38.2015.04.03.14.16.42 (version=TLSv1.1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Fri, 03 Apr 2015 14:16:43 -0700 (PDT) From: Joachim Eastwood To: linus.walleij@linaro.org, gnurou@gmail.com, linux-gpio@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: arnd@arndb.de, devicetree@vger.kernel.org, ariel.dalessandro@gmail.com, ezequiel@vanguardiasur.com.ar, Joachim Eastwood Subject: [PATCH 3/6] gpio: add lpc18xx gpio driver Date: Fri, 3 Apr 2015 23:16:04 +0200 Message-Id: <1428095767-6286-4-git-send-email-manabian@gmail.com> X-Mailer: git-send-email 1.8.0 In-Reply-To: <1428095767-6286-1-git-send-email-manabian@gmail.com> References: <1428095767-6286-1-git-send-email-manabian@gmail.com> Sender: linux-gpio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org Driver for the GPIO block found on NXP LPC18xx/43xx devices. The GPIO block is divided into 8 ports which each support up to 32 gpios. The which gpios that are available depends on the specific device and it's package. Signed-off-by: Joachim Eastwood --- drivers/gpio/Kconfig | 8 ++ drivers/gpio/Makefile | 1 + drivers/gpio/gpio-lpc18xx.c | 191 ++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 200 insertions(+) create mode 100644 drivers/gpio/gpio-lpc18xx.c diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index c1e2ca3d9a51..94f5c6ba1681 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -211,6 +211,14 @@ config GPIO_MOXART Select this option to enable GPIO driver for MOXA ART SoC devices. +config GPIO_LPC18XX + bool "NXP LPC18XX/43XX GPIO support" + default y if ARCH_LPC18XX + depends on OF_GPIO && (ARCH_LPC18XX || COMPILE_TEST) + help + Select this option to enable GPIO driver for + NXP LPC18XX/43XX devices. + config GPIO_MPC5200 def_bool y depends on PPC_MPC52xx diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index bdda6a94d2cd..a520ff7e28de 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -42,6 +42,7 @@ obj-$(CONFIG_GPIO_KEMPLD) += gpio-kempld.o obj-$(CONFIG_ARCH_KS8695) += gpio-ks8695.o obj-$(CONFIG_GPIO_INTEL_MID) += gpio-intel-mid.o obj-$(CONFIG_GPIO_LP3943) += gpio-lp3943.o +obj-$(CONFIG_GPIO_LPC18XX) += gpio-lpc18xx.o obj-$(CONFIG_ARCH_LPC32XX) += gpio-lpc32xx.o obj-$(CONFIG_GPIO_LYNXPOINT) += gpio-lynxpoint.o obj-$(CONFIG_GPIO_MAX730X) += gpio-max730x.o diff --git a/drivers/gpio/gpio-lpc18xx.c b/drivers/gpio/gpio-lpc18xx.c new file mode 100644 index 000000000000..3a8f93dbf1ed --- /dev/null +++ b/drivers/gpio/gpio-lpc18xx.c @@ -0,0 +1,191 @@ +/* + * GPIO driver for NXP LPC18xx/43xx. + * + * Copyright (C) 2015 Joachim Eastwood + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +/* LPC18xx GPIO register offsets */ +#define LPC18XX_REG_PWORD(n) (0x1000 + n * sizeof(u32)) +#define LPC18XX_REG_DIR(n) (0x2000 + n * sizeof(u32)) +#define LPC18XX_REG_SET(n) (0x2200 + n * sizeof(u32)) +#define LPC18XX_REG_CLR(n) (0x2280 + n * sizeof(u32)) + +#define LPC18XX_MAX_PORTS 8 +#define LPC18XX_PINS_PER_PORT 32 + +struct lpc18xx_gpio_chip { + struct gpio_chip gpio; + void __iomem *base; + struct clk *clk; +}; + +static inline struct lpc18xx_gpio_chip *to_lpc18xx_gpio(struct gpio_chip *chip) +{ + return container_of(chip, struct lpc18xx_gpio_chip, gpio); +} + +static int lpc18xx_gpio_request(struct gpio_chip *chip, unsigned offset) +{ + return pinctrl_request_gpio(offset); +} + +static void lpc18xx_gpio_free(struct gpio_chip *chip, unsigned offset) +{ + pinctrl_free_gpio(offset); +} + +static void lpc18xx_gpio_set(struct gpio_chip *chip, unsigned offset, int value) +{ + struct lpc18xx_gpio_chip *gc = to_lpc18xx_gpio(chip); + u32 port, pin, reg_offset; + + port = offset / LPC18XX_PINS_PER_PORT; + pin = offset % LPC18XX_PINS_PER_PORT; + + if (value) + reg_offset = LPC18XX_REG_SET(port); + else + reg_offset = LPC18XX_REG_CLR(port); + + writel(1 << pin, gc->base + reg_offset); +} + +static int lpc18xx_gpio_get(struct gpio_chip *chip, unsigned offset) +{ + struct lpc18xx_gpio_chip *gc = to_lpc18xx_gpio(chip); + u32 reg_offset = LPC18XX_REG_PWORD(offset); + + return !!readl(gc->base + reg_offset); +} + +static int lpc18xx_gpio_direction_input(struct gpio_chip *chip, unsigned offset) +{ + struct lpc18xx_gpio_chip *gc = to_lpc18xx_gpio(chip); + u32 port, pin, dir, reg_offset; + + port = offset / LPC18XX_PINS_PER_PORT; + pin = offset % LPC18XX_PINS_PER_PORT; + reg_offset = LPC18XX_REG_DIR(port); + + dir = readl(gc->base + reg_offset) & ~BIT(pin); + writel(dir, gc->base + reg_offset); + + return 0; +} + +static int lpc18xx_gpio_direction_output(struct gpio_chip *chip, + unsigned offset, int value) +{ + struct lpc18xx_gpio_chip *gc = to_lpc18xx_gpio(chip); + u32 port, pin, dir, reg_offset; + + lpc18xx_gpio_set(chip, offset, value); + + port = offset / LPC18XX_PINS_PER_PORT; + pin = offset % LPC18XX_PINS_PER_PORT; + reg_offset = LPC18XX_REG_DIR(port); + + dir = readl(gc->base + reg_offset) | BIT(pin); + writel(dir, gc->base + reg_offset); + + return 0; +} + +static struct gpio_chip lpc18xx_chip = { + .label = "lpc18xx/43xx-gpio", + .request = lpc18xx_gpio_request, + .free = lpc18xx_gpio_free, + .direction_input = lpc18xx_gpio_direction_input, + .direction_output = lpc18xx_gpio_direction_output, + .set = lpc18xx_gpio_set, + .get = lpc18xx_gpio_get, + .ngpio = LPC18XX_MAX_PORTS * LPC18XX_PINS_PER_PORT, + .owner = THIS_MODULE, +}; + +static int lpc18xx_gpio_probe(struct platform_device *pdev) +{ + struct lpc18xx_gpio_chip *gc; + struct resource *res; + int ret; + + gc = devm_kzalloc(&pdev->dev, sizeof(*gc), GFP_KERNEL); + if (!gc) + return -ENOMEM; + + gc->gpio = lpc18xx_chip; + platform_set_drvdata(pdev, gc); + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + gc->base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(gc->base)) + return PTR_ERR(gc->base); + + gc->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(gc->clk)) { + dev_err(&pdev->dev, "Input clock not found.\n"); + return PTR_ERR(gc->clk); + } + + ret = clk_prepare_enable(gc->clk); + if (ret) { + dev_err(&pdev->dev, "Unable to enable clock.\n"); + return ret; + } + + gc->gpio.dev = &pdev->dev; + gc->gpio.of_node = pdev->dev.of_node; + + ret = gpiochip_add(&gc->gpio); + if (ret) { + dev_err(&pdev->dev, "Failed to add gpio chip\n"); + clk_disable_unprepare(gc->clk); + return ret; + } + + return 0; +} + +static int lpc18xx_gpio_remove(struct platform_device *pdev) +{ + struct lpc18xx_gpio_chip *gc = platform_get_drvdata(pdev); + + gpiochip_remove(&gc->gpio); + clk_disable_unprepare(gc->clk); + + return 0; +} + +static const struct of_device_id lpc18xx_gpio_match[] = { + { .compatible = "nxp,lpc1850-gpio" }, + { } +}; +MODULE_DEVICE_TABLE(of, lpc18xx_gpio_match); + +static struct platform_driver lpc18xx_gpio_driver = { + .probe = lpc18xx_gpio_probe, + .remove = lpc18xx_gpio_remove, + .driver = { + .name = "lpc18xx-gpio", + .of_match_table = lpc18xx_gpio_match, + }, +}; +module_platform_driver(lpc18xx_gpio_driver); + +MODULE_AUTHOR("Joachim Eastwood "); +MODULE_DESCRIPTION("GPIO driver for LPC18xx/43xx"); +MODULE_LICENSE("GPL v2");