Add gpio driver for Ralink SoC. This driver makes the gpio core on MT7621 and MT7628 work.
Signed-off-by: John Crispin <[email protected]> Cc: [email protected] Cc: [email protected] --- drivers/gpio/Kconfig | 6 ++ drivers/gpio/Makefile | 1 + drivers/gpio/gpio-mt7621.c | 195 ++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 202 insertions(+) create mode 100644 drivers/gpio/gpio-mt7621.c diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index c91b15b..1ef83a0 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -523,6 +523,12 @@ config GPIO_MC9S08DZ60 help Select this to enable the MC9S08DZ60 GPIO driver +config GPIO_MT7621 + bool "Mediatek GPIO Support" + depends on MIPS && (SOC_MT7620 || SOC_MT7621) + help + Say yes here to support the Mediatek SoC GPIO device + config GPIO_PCA953X tristate "PCA95[357]x, PCA9698, TCA64xx, and MAX7310 I/O ports" depends on I2C diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index d8f0f17..60a9e0e 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -57,6 +57,7 @@ obj-$(CONFIG_GPIO_MPC8XXX) += gpio-mpc8xxx.o obj-$(CONFIG_GPIO_MSIC) += gpio-msic.o obj-$(CONFIG_GPIO_MSM_V1) += gpio-msm-v1.o obj-$(CONFIG_GPIO_MSM_V2) += gpio-msm-v2.o +obj-$(CONFIG_GPIO_MT7621) += gpio-mt7621.o obj-$(CONFIG_GPIO_MVEBU) += gpio-mvebu.o obj-$(CONFIG_GPIO_MXC) += gpio-mxc.o obj-$(CONFIG_GPIO_MXS) += gpio-mxs.o diff --git a/drivers/gpio/gpio-mt7621.c b/drivers/gpio/gpio-mt7621.c new file mode 100644 index 0000000..7faf2c0 --- /dev/null +++ b/drivers/gpio/gpio-mt7621.c @@ -0,0 +1,195 @@ +/* + * 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. + * + * Copyright (C) 2009-2011 Gabor Juhos <[email protected]> + * Copyright (C) 2013 John Crispin <[email protected]> + */ + +#include <linux/io.h> +#include <linux/err.h> +#include <linux/gpio.h> +#include <linux/module.h> +#include <linux/of_irq.h> +#include <linux/spinlock.h> +#include <linux/irqdomain.h> +#include <linux/interrupt.h> +#include <linux/platform_device.h> + +#define MTK_BANK_WIDTH 32 + +enum mediatek_gpio_reg { + GPIO_REG_CTRL = 0, + GPIO_REG_POL, + GPIO_REG_DATA, + GPIO_REG_DSET, + GPIO_REG_DCLR, +}; + +static void __iomem *mtk_gc_membase; + +struct mtk_gc { + struct gpio_chip chip; + spinlock_t lock; + int bank; +}; + +static inline struct mtk_gc +*to_mediatek_gpio(struct gpio_chip *chip) +{ + struct mtk_gc *mgc; + + mgc = container_of(chip, struct mtk_gc, chip); + + return mgc; +} + +static inline void +mtk_gpio_w32(struct mtk_gc *rg, u8 reg, u32 val) +{ + iowrite32(val, mtk_gc_membase + (reg * 0x10) + (rg->bank * 0x4)); +} + +static inline u32 +mtk_gpio_r32(struct mtk_gc *rg, u8 reg) +{ + return ioread32(mtk_gc_membase + (reg * 0x10) + (rg->bank * 0x4)); +} + +static void +mediatek_gpio_set(struct gpio_chip *chip, unsigned offset, int value) +{ + struct mtk_gc *rg = to_mediatek_gpio(chip); + + mtk_gpio_w32(rg, (value) ? GPIO_REG_DSET : GPIO_REG_DCLR, BIT(offset)); +} + +static int +mediatek_gpio_get(struct gpio_chip *chip, unsigned offset) +{ + struct mtk_gc *rg = to_mediatek_gpio(chip); + + return !!(mtk_gpio_r32(rg, GPIO_REG_DATA) & BIT(offset)); +} + +static int +mediatek_gpio_direction_input(struct gpio_chip *chip, unsigned offset) +{ + struct mtk_gc *rg = to_mediatek_gpio(chip); + unsigned long flags; + u32 t; + + spin_lock_irqsave(&rg->lock, flags); + t = mtk_gpio_r32(rg, GPIO_REG_CTRL); + t &= ~BIT(offset); + mtk_gpio_w32(rg, GPIO_REG_CTRL, t); + spin_unlock_irqrestore(&rg->lock, flags); + + return 0; +} + +static int +mediatek_gpio_direction_output(struct gpio_chip *chip, + unsigned offset, int value) +{ + struct mtk_gc *rg = to_mediatek_gpio(chip); + unsigned long flags; + u32 t; + + spin_lock_irqsave(&rg->lock, flags); + t = mtk_gpio_r32(rg, GPIO_REG_CTRL); + t |= BIT(offset); + mtk_gpio_w32(rg, GPIO_REG_CTRL, t); + mediatek_gpio_set(chip, offset, value); + spin_unlock_irqrestore(&rg->lock, flags); + + return 0; +} + +static int +mediatek_gpio_request(struct gpio_chip *chip, unsigned offset) +{ + int gpio = chip->base + offset; + + return pinctrl_request_gpio(gpio); +} + +static void +mediatek_gpio_free(struct gpio_chip *chip, unsigned offset) +{ + int gpio = chip->base + offset; + + pinctrl_free_gpio(gpio); +} + +static int +mediatek_gpio_bank_probe(struct platform_device *pdev, struct device_node *bank) +{ + const __be32 *id = of_get_property(bank, "reg", NULL); + struct mtk_gc *rg = devm_kzalloc(&pdev->dev, + sizeof(struct mtk_gc), GFP_KERNEL); + if (!rg || !id) + return -ENOMEM; + + spin_lock_init(&rg->lock); + + rg->chip.dev = &pdev->dev; + rg->chip.label = dev_name(&pdev->dev); + rg->chip.of_node = bank; + rg->chip.base = MTK_BANK_WIDTH * be32_to_cpu(*id); + rg->chip.ngpio = MTK_BANK_WIDTH; + rg->chip.direction_input = mediatek_gpio_direction_input; + rg->chip.direction_output = mediatek_gpio_direction_output; + rg->chip.get = mediatek_gpio_get; + rg->chip.set = mediatek_gpio_set; + rg->chip.request = mediatek_gpio_request; + rg->chip.free = mediatek_gpio_free; + + /* set polarity to low for all gpios */ + mtk_gpio_w32(rg, GPIO_REG_POL, 0); + + dev_info(&pdev->dev, "registering %d gpios\n", rg->chip.ngpio); + + return gpiochip_add(&rg->chip); +} + +static int +mediatek_gpio_probe(struct platform_device *pdev) +{ + struct device_node *bank, *np = pdev->dev.of_node; + struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + + mtk_gc_membase = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(mtk_gc_membase)) + return PTR_ERR(mtk_gc_membase); + + for_each_child_of_node(np, bank) + if (of_device_is_compatible(bank, "mediatek,mt7621-gpio-bank")) + mediatek_gpio_bank_probe(pdev, bank); + + return 0; +} + +static const struct of_device_id mediatek_gpio_match[] = { + { .compatible = "mediatek,mt7621-gpio" }, + {}, +}; +MODULE_DEVICE_TABLE(of, mediatek_gpio_match); + +static struct platform_driver mediatek_gpio_driver = { + .probe = mediatek_gpio_probe, + .driver = { + .name = "mt7621_gpio", + .owner = THIS_MODULE, + .of_match_table = mediatek_gpio_match, + }, +}; + +static int __init +mediatek_gpio_init(void) +{ + return platform_driver_register(&mediatek_gpio_driver); +} + +subsys_initcall(mediatek_gpio_init); -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-gpio" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
