From mboxrd@z Thu Jan 1 00:00:00 1970 From: Baolin Wang Subject: [PATCH v3 2/2] gpio: Add GPIO driver for Spreadtrum SC9860 platform Date: Mon, 5 Feb 2018 09:55:11 +0800 Message-ID: References: <2834309f69a1ec37b84a33f153a3d0b90336bcc6.1517795460.git.baolin.wang@linaro.org> Return-path: In-Reply-To: <2834309f69a1ec37b84a33f153a3d0b90336bcc6.1517795460.git.baolin.wang@linaro.org> In-Reply-To: <2834309f69a1ec37b84a33f153a3d0b90336bcc6.1517795460.git.baolin.wang@linaro.org> References: <2834309f69a1ec37b84a33f153a3d0b90336bcc6.1517795460.git.baolin.wang@linaro.org> Sender: linux-kernel-owner@vger.kernel.org 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, andy.shevchenko@gmail.com List-Id: devicetree@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 --- Changes since v2: - Use devm_ioremap_resource() instead of devm_ioremap_nocache(). Changes since v1: - Change 'bool' to 'tristate'. - Add reviewed tag from Andy. --- drivers/gpio/Kconfig | 7 ++ drivers/gpio/Makefile | 1 + drivers/gpio/gpio-sprd.c | 290 ++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 298 insertions(+) create mode 100644 drivers/gpio/gpio-sprd.c diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index d6a8e85..2ed1a88 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 + tristate "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..7c0f9f1 --- /dev/null +++ b/drivers/gpio/gpio-sprd.c @@ -0,0 +1,290 @@ +// 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_resource(&pdev->dev, res); + if (IS_ERR(sprd_gpio->base)) + return PTR_ERR(sprd_gpio->base); + + 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, + }, +}; + +module_platform_driver_probe(sprd_gpio_driver, sprd_gpio_probe); + +MODULE_DESCRIPTION("Spreadtrum GPIO driver"); +MODULE_LICENSE("GPL v2"); -- 1.7.9.5