From 8481cdf6f96dc16cbcc129d046c021d17a891274 Mon Sep 17 00:00:00 2001 From: John Crispin Date: Sun, 27 Jul 2014 11:00:32 +0100 Subject: [PATCH 48/57] GPIO: ralink: add mt7621 gpio controller Signed-off-by: John Crispin --- arch/mips/Kconfig | 3 + drivers/gpio/Kconfig | 6 ++ drivers/gpio/Makefile | 1 + drivers/gpio/gpio-mt7621.c | 177 ++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 187 insertions(+) create mode 100644 drivers/gpio/gpio-mt7621.c --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -455,6 +455,9 @@ config RALINK select RESET_CONTROLLER select PINCTRL select PINCTRL_RT2880 + select ARCH_HAS_RESET_CONTROLLER + select RESET_CONTROLLER + select ARCH_REQUIRE_GPIOLIB config SGI_IP22 bool "SGI IP22 (Indy/Indigo2)" --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -898,6 +898,12 @@ config GPIO_BCM_KONA help Turn on GPIO support for Broadcom "Kona" chips. +config GPIO_MT7621 + bool "Mediatek GPIO Support" + depends on SOC_MT7620 || SOC_MT7621 + help + Say yes here to support the Mediatek SoC GPIO device + comment "USB GPIO expanders:" config GPIO_VIPERBOARD --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -107,3 +107,5 @@ obj-$(CONFIG_GPIO_XILINX) += gpio-xilinx obj-$(CONFIG_GPIO_XTENSA) += gpio-xtensa.o obj-$(CONFIG_GPIO_ZEVIO) += gpio-zevio.o obj-$(CONFIG_GPIO_ZYNQ) += gpio-zynq.o +obj-$(CONFIG_GPIO_MT7621) += gpio-mt7621.o + --- /dev/null +++ b/drivers/gpio/gpio-mt7621.c @@ -0,0 +1,354 @@ +/* + * 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_MAX_BANK 3 +#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, + GPIO_REG_REDGE, + GPIO_REG_FEDGE, + GPIO_REG_HLVL, + GPIO_REG_LLVL, + GPIO_REG_STAT, + GPIO_REG_EDGE, +}; + +static void __iomem *mediatek_gpio_membase; +static int mediatek_gpio_irq; +static struct irq_domain *mediatek_gpio_irq_domain; +static atomic_t irq_refcount = ATOMIC_INIT(0); + +struct mtk_gc { + struct gpio_chip chip; + spinlock_t lock; + int bank; + u32 rising; + u32 falling; +} *gc_map[MTK_MAX_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, mediatek_gpio_membase + (reg * 0x10) + (rg->bank * 0x4)); +} + +static inline u32 +mtk_gpio_r32(struct mtk_gc *rg, u8 reg) +{ + return ioread32(mediatek_gpio_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_get_direction(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); + spin_unlock_irqrestore(&rg->lock, flags); + + if (t & BIT(offset)) + return 0; + + return 1; +} + +static int +mediatek_gpio_to_irq(struct gpio_chip *chip, unsigned pin) +{ + struct mtk_gc *rg = to_mediatek_gpio(chip); + + return irq_create_mapping(mediatek_gpio_irq_domain, pin + (rg->bank * MTK_BANK_WIDTH)); +} + +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 || be32_to_cpu(*id) > MTK_MAX_BANK) + return -ENOMEM; + + gc_map[be32_to_cpu(*id)] = rg; + + memset(rg, 0, sizeof(struct mtk_gc)); + + 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_direction = mediatek_gpio_get_direction; + rg->chip.get = mediatek_gpio_get; + rg->chip.set = mediatek_gpio_set; + if (mediatek_gpio_irq_domain) + rg->chip.to_irq = mediatek_gpio_to_irq; + rg->bank = be32_to_cpu(*id); + + /* 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 void +mediatek_gpio_irq_handler(unsigned int irq, struct irq_desc *desc) +{ + int i; + + for (i = 0; i < MTK_MAX_BANK; i++) { + struct mtk_gc *rg = gc_map[i]; + unsigned long pending; + int bit; + + if (!rg) + continue; + + pending = mtk_gpio_r32(rg, GPIO_REG_STAT); + + for_each_set_bit(bit, &pending, MTK_BANK_WIDTH) { + u32 map = irq_find_mapping(mediatek_gpio_irq_domain, (MTK_BANK_WIDTH * i) + bit); + + generic_handle_irq(map); + mtk_gpio_w32(rg, GPIO_REG_STAT, BIT(bit)); + } + } +} + +static void +mediatek_gpio_irq_unmask(struct irq_data *d) +{ + int pin = d->hwirq; + int bank = pin / 32; + struct mtk_gc *rg = gc_map[bank]; + unsigned long flags; + u32 rise, fall; + + if (!rg) + return; + + rise = mtk_gpio_r32(rg, GPIO_REG_REDGE); + fall = mtk_gpio_r32(rg, GPIO_REG_FEDGE); + + spin_lock_irqsave(&rg->lock, flags); + mtk_gpio_w32(rg, GPIO_REG_REDGE, rise | (BIT(d->hwirq) & rg->rising)); + mtk_gpio_w32(rg, GPIO_REG_FEDGE, fall | (BIT(d->hwirq) & rg->falling)); + spin_unlock_irqrestore(&rg->lock, flags); +} + +static void +mediatek_gpio_irq_mask(struct irq_data *d) +{ + int pin = d->hwirq; + int bank = pin / 32; + struct mtk_gc *rg = gc_map[bank]; + unsigned long flags; + u32 rise, fall; + + if (!rg) + return; + + rise = mtk_gpio_r32(rg, GPIO_REG_REDGE); + fall = mtk_gpio_r32(rg, GPIO_REG_FEDGE); + + spin_lock_irqsave(&rg->lock, flags); + mtk_gpio_w32(rg, GPIO_REG_FEDGE, fall & ~BIT(d->hwirq)); + mtk_gpio_w32(rg, GPIO_REG_REDGE, rise & ~BIT(d->hwirq)); + spin_unlock_irqrestore(&rg->lock, flags); +} + +static int +mediatek_gpio_irq_type(struct irq_data *d, unsigned int type) +{ + int pin = d->hwirq; + int bank = pin / 32; + struct mtk_gc *rg = gc_map[bank]; + u32 mask = BIT(d->hwirq); + + if (!rg) + return -1; + + if (type == IRQ_TYPE_PROBE) { + if ((rg->rising | rg->falling) & mask) + return 0; + + type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING; + } + + if (type & IRQ_TYPE_EDGE_RISING) + rg->rising |= mask; + else + rg->rising &= ~mask; + + if (type & IRQ_TYPE_EDGE_FALLING) + rg->falling |= mask; + else + rg->falling &= ~mask; + + return 0; +} + +static struct irq_chip mediatek_gpio_irq_chip = { + .name = "GPIO", + .irq_unmask = mediatek_gpio_irq_unmask, + .irq_mask = mediatek_gpio_irq_mask, + .irq_mask_ack = mediatek_gpio_irq_mask, + .irq_set_type = mediatek_gpio_irq_type, +}; + +static int +mediatek_gpio_gpio_map(struct irq_domain *d, unsigned int irq, irq_hw_number_t hw) +{ + irq_set_chip_and_handler(irq, &mediatek_gpio_irq_chip, handle_level_irq); + irq_set_handler_data(irq, d); + + return 0; +} + +static const struct irq_domain_ops irq_domain_ops = { + .xlate = irq_domain_xlate_onecell, + .map = mediatek_gpio_gpio_map, +}; + +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); + + mediatek_gpio_membase = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(mediatek_gpio_membase)) + return PTR_ERR(mediatek_gpio_membase); + + mediatek_gpio_irq = irq_of_parse_and_map(np, 0); + if (mediatek_gpio_irq) { + mediatek_gpio_irq_domain = irq_domain_add_linear(np, + MTK_MAX_BANK * MTK_BANK_WIDTH, + &irq_domain_ops, NULL); + if (!mediatek_gpio_irq_domain) + dev_err(&pdev->dev, "irq_domain_add_linear failed\n"); + } + + for_each_child_of_node(np, bank) + if (of_device_is_compatible(bank, "mtk,mt7621-gpio-bank")) + mediatek_gpio_bank_probe(pdev, bank); + + if (mediatek_gpio_irq_domain) + irq_set_chained_handler(mediatek_gpio_irq, mediatek_gpio_irq_handler); + + 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);