From patchwork Tue Jan 30 12:07:43 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Baolin Wang X-Patchwork-Id: 867474 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=linux-gpio-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (1024-bit key; unprotected) header.d=linaro.org header.i=@linaro.org header.b="Ic/08LdO"; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 3zW4tT1s0mz9s7M for ; Tue, 30 Jan 2018 23:09:21 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751391AbeA3MJS (ORCPT ); Tue, 30 Jan 2018 07:09:18 -0500 Received: from mail-pg0-f65.google.com ([74.125.83.65]:37241 "EHLO mail-pg0-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751834AbeA3MJA (ORCPT ); Tue, 30 Jan 2018 07:09:00 -0500 Received: by mail-pg0-f65.google.com with SMTP id z17so7075060pgc.4 for ; Tue, 30 Jan 2018 04:09:00 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :in-reply-to:references; bh=rMGVfSsjiBd0lKDI+p2K2Smlggzk9hMIOb8jLFL/buA=; b=Ic/08LdOEj+z2uG4t1jeWoRHT8QET/NA/OxcPNlQuZ8CPZS9NKIubeLfvouPVOCUpT 5wT91bOpRZ8PUimKm1KZRloJmVglT1Z/YSYmaJ/2kb4BpJ3fl8zNF8C6k2W6j9b5lPgj 5jPZ8hbhFq2DrGt/p9BaXo4bSrS8m6CWZUpSQ= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:in-reply-to:references; bh=rMGVfSsjiBd0lKDI+p2K2Smlggzk9hMIOb8jLFL/buA=; b=dwkRWbeeJbVyH5RL+OQ98sMxxCQVjenCgbedrT6YZg9oPBcPTuGcB1ZFwM0kmATtHT p7zB3Yi4P8zBObJroW21QS1jfXDpnNhVdYknUlQjK+pcAChlCndeZl5EoQkI8ycIkagM M05SdzoNo0ouKO3jy0GYgAh6GAdGG1kug8IsE7N3AS39aa9wbPk7hXRm4Ayl0f9qts/6 lAlKxXbEHnTJXavCBDkE4AVz0u67SYTbyYZO4YZZC/x4WIGzYjtgBMQye3ziFv2M5Hzj QKFAGYKn7MMoNNXUu4OP3BtBnN+eky/beU6g3QOvwVueLinuVg2tIDrNav5nv3Bhyhi7 JF8Q== X-Gm-Message-State: AKwxytfbyaeS269EXO7Zxu1ffKsai+kHGZhWl6l/z044xLkiTcyF1ja0 +XjrXMmtEBHxLDeZB2gD168v4g== X-Google-Smtp-Source: AH8x225uXHuXne2cGoohW8MCKSUHYTqaWYwXITje8ABL2fnUvFz2YteXwDi/0DBm705tVmcV8/SRJQ== X-Received: by 10.98.246.8 with SMTP id x8mr29807020pfh.234.1517314139818; Tue, 30 Jan 2018 04:08:59 -0800 (PST) Received: from baolinwangubtpc.spreadtrum.com ([117.18.48.82]) by smtp.gmail.com with ESMTPSA id y1sm22961534pge.78.2018.01.30.04.08.56 (version=TLS1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Tue, 30 Jan 2018 04:08:59 -0800 (PST) From: Baolin Wang To: linus.walleij@linaro.org, robh+dt@kernel.org, mark.rutland@arm.com Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org, broonie@kernel.org, baolin.wang@linaro.org Subject: [PATCH 2/2] gpio: Add GPIO driver for Spreadtrum SC9860 platform Date: Tue, 30 Jan 2018 20:07:43 +0800 Message-Id: X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <2834309f69a1ec37b84a33f153a3d0b90336bcc6.1517313987.git.baolin.wang@linaro.org> References: <2834309f69a1ec37b84a33f153a3d0b90336bcc6.1517313987.git.baolin.wang@linaro.org> In-Reply-To: <2834309f69a1ec37b84a33f153a3d0b90336bcc6.1517313987.git.baolin.wang@linaro.org> References: <2834309f69a1ec37b84a33f153a3d0b90336bcc6.1517313987.git.baolin.wang@linaro.org> Sender: linux-gpio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org The Spreadtrum SC9860 platform GPIO controller contains 16 groups and each group contains 16 GPIOs. Each GPIO can set input/output and has the interrupt capability. Signed-off-by: Baolin Wang Reviewed-by: Andy Shevchenko --- drivers/gpio/Kconfig | 7 ++ drivers/gpio/Makefile | 1 + drivers/gpio/gpio-sprd.c | 301 ++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 309 insertions(+) create mode 100644 drivers/gpio/gpio-sprd.c diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index d6a8e85..3bece19 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -404,6 +404,13 @@ config GPIO_SPEAR_SPICS help Say yes here to support ST SPEAr SPI Chip Select as GPIO device +config GPIO_SPRD + bool "Spreadtrum GPIO support" + depends on ARCH_SPRD || COMPILE_TEST + select GPIOLIB_IRQCHIP + help + Say yes here to support Spreadtrum GPIO device. + config GPIO_STA2X11 bool "STA2x11/ConneXt GPIO support" depends on MFD_STA2X11 diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index 4bc24fe..5b633a0 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -108,6 +108,7 @@ obj-$(CONFIG_GPIO_SCH) += gpio-sch.o obj-$(CONFIG_GPIO_SCH311X) += gpio-sch311x.o obj-$(CONFIG_GPIO_SODAVILLE) += gpio-sodaville.o obj-$(CONFIG_GPIO_SPEAR_SPICS) += gpio-spear-spics.o +obj-$(CONFIG_GPIO_SPRD) += gpio-sprd.o obj-$(CONFIG_GPIO_STA2X11) += gpio-sta2x11.o obj-$(CONFIG_GPIO_STMPE) += gpio-stmpe.o obj-$(CONFIG_GPIO_STP_XWAY) += gpio-stp-xway.o diff --git a/drivers/gpio/gpio-sprd.c b/drivers/gpio/gpio-sprd.c new file mode 100644 index 0000000..af59b9f --- /dev/null +++ b/drivers/gpio/gpio-sprd.c @@ -0,0 +1,301 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2018 Spreadtrum Communications Inc. + * Copyright (c) 2018 Linaro Ltd. + */ + +#include +#include +#include +#include +#include +#include +#include + +/* GPIO registers definition */ +#define SPRD_GPIO_DATA 0x0 +#define SPRD_GPIO_DMSK 0x4 +#define SPRD_GPIO_DIR 0x8 +#define SPRD_GPIO_IS 0xc +#define SPRD_GPIO_IBE 0x10 +#define SPRD_GPIO_IEV 0x14 +#define SPRD_GPIO_IE 0x18 +#define SPRD_GPIO_RIS 0x1c +#define SPRD_GPIO_MIS 0x20 +#define SPRD_GPIO_IC 0x24 +#define SPRD_GPIO_INEN 0x28 + +/* We have 16 groups GPIOs and each group contain 16 GPIOs */ +#define SPRD_GPIO_GROUP_NR 16 +#define SPRD_GPIO_NR 256 +#define SPRD_GPIO_GROUP_SIZE 0x80 +#define SPRD_GPIO_GROUP_MASK GENMASK(15, 0) +#define SPRD_GPIO_BIT(x) ((x) & (SPRD_GPIO_GROUP_NR - 1)) + +struct sprd_gpio { + struct gpio_chip chip; + void __iomem *base; + spinlock_t lock; + int irq; +}; + +static inline void __iomem *sprd_gpio_group_base(struct sprd_gpio *sprd_gpio, + unsigned int group) +{ + return sprd_gpio->base + SPRD_GPIO_GROUP_SIZE * group; +} + +static void sprd_gpio_update(struct gpio_chip *chip, unsigned int offset, + unsigned int reg, unsigned int val) +{ + struct sprd_gpio *sprd_gpio = gpiochip_get_data(chip); + void __iomem *base = sprd_gpio_group_base(sprd_gpio, + offset / SPRD_GPIO_GROUP_NR); + u32 shift = SPRD_GPIO_BIT(offset); + unsigned long flags; + u32 orig, tmp; + + spin_lock_irqsave(&sprd_gpio->lock, flags); + orig = readl_relaxed(base + reg); + + tmp = (orig & ~BIT(shift)) | (val << shift); + writel_relaxed(tmp, base + reg); + spin_unlock_irqrestore(&sprd_gpio->lock, flags); +} + +static int sprd_gpio_read(struct gpio_chip *chip, unsigned int offset, + unsigned int reg) +{ + struct sprd_gpio *sprd_gpio = gpiochip_get_data(chip); + void __iomem *base = sprd_gpio_group_base(sprd_gpio, + offset / SPRD_GPIO_GROUP_NR); + u32 value = readl_relaxed(base + reg) & SPRD_GPIO_GROUP_MASK; + u32 shift = SPRD_GPIO_BIT(offset); + + return !!(value & BIT(shift)); +} + +static int sprd_gpio_request(struct gpio_chip *chip, unsigned int offset) +{ + sprd_gpio_update(chip, offset, SPRD_GPIO_DMSK, 1); + return 0; +} + +static void sprd_gpio_free(struct gpio_chip *chip, unsigned int offset) +{ + sprd_gpio_update(chip, offset, SPRD_GPIO_DMSK, 0); +} + +static int sprd_gpio_direction_input(struct gpio_chip *chip, + unsigned int offset) +{ + sprd_gpio_update(chip, offset, SPRD_GPIO_DIR, 0); + sprd_gpio_update(chip, offset, SPRD_GPIO_INEN, 1); + return 0; +} + +static int sprd_gpio_direction_output(struct gpio_chip *chip, + unsigned int offset, int value) +{ + sprd_gpio_update(chip, offset, SPRD_GPIO_DIR, 1); + sprd_gpio_update(chip, offset, SPRD_GPIO_INEN, 0); + sprd_gpio_update(chip, offset, SPRD_GPIO_DATA, value); + return 0; +} + +static int sprd_gpio_get(struct gpio_chip *chip, unsigned int offset) +{ + return sprd_gpio_read(chip, offset, SPRD_GPIO_DATA); +} + +static void sprd_gpio_set(struct gpio_chip *chip, unsigned int offset, + int value) +{ + sprd_gpio_update(chip, offset, SPRD_GPIO_DATA, value); +} + +static void sprd_gpio_irq_mask(struct irq_data *data) +{ + struct gpio_chip *chip = irq_data_get_irq_chip_data(data); + u32 offset = irqd_to_hwirq(data); + + sprd_gpio_update(chip, offset, SPRD_GPIO_IE, 0); +} + +static void sprd_gpio_irq_ack(struct irq_data *data) +{ + struct gpio_chip *chip = irq_data_get_irq_chip_data(data); + u32 offset = irqd_to_hwirq(data); + + sprd_gpio_update(chip, offset, SPRD_GPIO_IC, 1); +} + +static void sprd_gpio_irq_unmask(struct irq_data *data) +{ + struct gpio_chip *chip = irq_data_get_irq_chip_data(data); + u32 offset = irqd_to_hwirq(data); + + sprd_gpio_update(chip, offset, SPRD_GPIO_IE, 1); +} + +static int sprd_gpio_irq_set_type(struct irq_data *data, + unsigned int flow_type) +{ + struct gpio_chip *chip = irq_data_get_irq_chip_data(data); + u32 offset = irqd_to_hwirq(data); + + switch (flow_type) { + case IRQ_TYPE_EDGE_RISING: + sprd_gpio_update(chip, offset, SPRD_GPIO_IS, 0); + sprd_gpio_update(chip, offset, SPRD_GPIO_IBE, 0); + sprd_gpio_update(chip, offset, SPRD_GPIO_IEV, 1); + irq_set_handler_locked(data, handle_edge_irq); + break; + case IRQ_TYPE_EDGE_FALLING: + sprd_gpio_update(chip, offset, SPRD_GPIO_IS, 0); + sprd_gpio_update(chip, offset, SPRD_GPIO_IBE, 0); + sprd_gpio_update(chip, offset, SPRD_GPIO_IEV, 0); + irq_set_handler_locked(data, handle_edge_irq); + break; + case IRQ_TYPE_EDGE_BOTH: + sprd_gpio_update(chip, offset, SPRD_GPIO_IS, 0); + sprd_gpio_update(chip, offset, SPRD_GPIO_IBE, 1); + irq_set_handler_locked(data, handle_edge_irq); + break; + case IRQ_TYPE_LEVEL_HIGH: + sprd_gpio_update(chip, offset, SPRD_GPIO_IS, 1); + sprd_gpio_update(chip, offset, SPRD_GPIO_IBE, 0); + sprd_gpio_update(chip, offset, SPRD_GPIO_IEV, 1); + irq_set_handler_locked(data, handle_level_irq); + break; + case IRQ_TYPE_LEVEL_LOW: + sprd_gpio_update(chip, offset, SPRD_GPIO_IS, 1); + sprd_gpio_update(chip, offset, SPRD_GPIO_IBE, 0); + sprd_gpio_update(chip, offset, SPRD_GPIO_IEV, 0); + irq_set_handler_locked(data, handle_level_irq); + break; + default: + return -EINVAL; + } + + return 0; +} + +static void sprd_gpio_irq_handler(struct irq_desc *desc) +{ + struct gpio_chip *chip = irq_desc_get_handler_data(desc); + struct irq_chip *ic = irq_desc_get_chip(desc); + struct sprd_gpio *sprd_gpio = gpiochip_get_data(chip); + u32 group, n, girq; + + chained_irq_enter(ic, desc); + + for (group = 0; group * SPRD_GPIO_GROUP_NR < chip->ngpio; group++) { + void __iomem *base = sprd_gpio_group_base(sprd_gpio, group); + unsigned long reg = readl_relaxed(base + SPRD_GPIO_MIS) & + SPRD_GPIO_GROUP_MASK; + + for_each_set_bit(n, ®, SPRD_GPIO_GROUP_NR) { + girq = irq_find_mapping(chip->irq.domain, + group * SPRD_GPIO_GROUP_NR + n); + + generic_handle_irq(girq); + } + + } + chained_irq_exit(ic, desc); +} + +static struct irq_chip sprd_gpio_irqchip = { + .name = "sprd-gpio", + .irq_ack = sprd_gpio_irq_ack, + .irq_mask = sprd_gpio_irq_mask, + .irq_unmask = sprd_gpio_irq_unmask, + .irq_set_type = sprd_gpio_irq_set_type, + .flags = IRQCHIP_SKIP_SET_WAKE, +}; + +static int sprd_gpio_probe(struct platform_device *pdev) +{ + struct gpio_irq_chip *irq; + struct sprd_gpio *sprd_gpio; + struct resource *res; + int ret; + + sprd_gpio = devm_kzalloc(&pdev->dev, sizeof(*sprd_gpio), GFP_KERNEL); + if (!sprd_gpio) + return -ENOMEM; + + sprd_gpio->irq = platform_get_irq(pdev, 0); + if (sprd_gpio->irq < 0) { + dev_err(&pdev->dev, "Failed to get GPIO interrupt.\n"); + return sprd_gpio->irq; + } + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + sprd_gpio->base = devm_ioremap_nocache(&pdev->dev, res->start, + resource_size(res)); + if (!sprd_gpio->base) + return -ENOMEM; + + spin_lock_init(&sprd_gpio->lock); + + sprd_gpio->chip.label = dev_name(&pdev->dev); + sprd_gpio->chip.ngpio = SPRD_GPIO_NR; + sprd_gpio->chip.base = -1; + sprd_gpio->chip.parent = &pdev->dev; + sprd_gpio->chip.of_node = pdev->dev.of_node; + sprd_gpio->chip.request = sprd_gpio_request; + sprd_gpio->chip.free = sprd_gpio_free; + sprd_gpio->chip.get = sprd_gpio_get; + sprd_gpio->chip.set = sprd_gpio_set; + sprd_gpio->chip.direction_input = sprd_gpio_direction_input; + sprd_gpio->chip.direction_output = sprd_gpio_direction_output; + + irq = &sprd_gpio->chip.irq; + irq->chip = &sprd_gpio_irqchip; + irq->handler = handle_simple_irq; + irq->default_type = IRQ_TYPE_NONE; + irq->parent_handler = sprd_gpio_irq_handler; + irq->parent_handler_data = sprd_gpio; + irq->num_parents = 1; + irq->parents = &sprd_gpio->irq; + + ret = devm_gpiochip_add_data(&pdev->dev, &sprd_gpio->chip, sprd_gpio); + if (ret < 0) { + dev_err(&pdev->dev, "Could not register gpiochip %d\n", ret); + return ret; + } + + platform_set_drvdata(pdev, sprd_gpio); + return 0; +} + +static const struct of_device_id sprd_gpio_of_match[] = { + { .compatible = "sprd,sc9860-gpio", }, + { /* end of list */ }, +}; +MODULE_DEVICE_TABLE(of, sprd_gpio_of_match); + +static struct platform_driver sprd_gpio_driver = { + .probe = sprd_gpio_probe, + .driver = { + .name = "sprd-gpio", + .of_match_table = sprd_gpio_of_match, + }, +}; + +static int __init sprd_gpio_init(void) +{ + return platform_driver_register(&sprd_gpio_driver); +} +subsys_initcall(sprd_gpio_init); + +static void __exit sprd_gpio_exit(void) +{ + platform_driver_unregister(&sprd_gpio_driver); +} +module_exit(sprd_gpio_exit); + +MODULE_DESCRIPTION("Spreadtrum GPIO driver"); +MODULE_LICENSE("GPL v2");