From e19957560170d63c6a5f0b1d7ba63695e4d1f033 Mon Sep 17 00:00:00 2001 From: John Crispin Date: Mon, 2 Dec 2013 16:14:28 +0100 Subject: [PATCH 506/507] GPIO: ralink: add mt7621 gpio controller Signed-off-by: John Crispin --- arch/mips/Kconfig | 1 + drivers/gpio/Kconfig | 6 ++ drivers/gpio/Makefile | 1 + drivers/gpio/gpio-mt7621.c | 183 ++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 191 insertions(+) create mode 100644 drivers/gpio/gpio-mt7621.c Index: linux-3.10.21/drivers/gpio/Kconfig =================================================================== --- linux-3.10.21.orig/drivers/gpio/Kconfig 2013-12-09 19:56:09.376682007 +0100 +++ linux-3.10.21/drivers/gpio/Kconfig 2013-12-09 19:58:35.372685422 +0100 @@ -710,6 +710,12 @@ Enable support for GPIO on intel MSIC controllers found in intel MID devices +config GPIO_MT7621 + bool "Mediatek GPIO Support" + depends on RALINK && SOC_MT7621 + help + Say yes here to support the Mediatek SoC GPIO device + comment "USB GPIO expanders:" config GPIO_VIPERBOARD Index: linux-3.10.21/drivers/gpio/Makefile =================================================================== --- linux-3.10.21.orig/drivers/gpio/Makefile 2013-12-09 19:56:09.376682007 +0100 +++ linux-3.10.21/drivers/gpio/Makefile 2013-12-09 19:56:09.760682017 +0100 @@ -88,3 +88,4 @@ obj-$(CONFIG_GPIO_WM8350) += gpio-wm8350.o obj-$(CONFIG_GPIO_WM8994) += gpio-wm8994.o obj-$(CONFIG_GPIO_XILINX) += gpio-xilinx.o +obj-$(CONFIG_GPIO_MT7621) += gpio-mt7621.o Index: linux-3.10.21/drivers/gpio/gpio-mt7621.c =================================================================== --- /dev/null 1970-01-01 00:00:00.000000000 +0000 +++ linux-3.10.21/drivers/gpio/gpio-mt7621.c 2013-12-09 19:56:09.760682017 +0100 @@ -0,0 +1,183 @@ +/* + * 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 + * Copyright (C) 2013 John Crispin + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#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; +}; + +int +gpio_to_irq(unsigned gpio) +{ + return -1; +} + +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_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; + + /* 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_request_and_ioremap(&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, "mtk,mt7621-gpio-bank")) + mediatek_gpio_bank_probe(pdev, bank); + + return 0; +} + +static const struct of_device_id mediatek_gpio_match[] = { + { .compatible = "mtk,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);