--- /dev/null
+From 61ac7d9b4228de8c332900902c2b93189b042eab Mon Sep 17 00:00:00 2001
+From: John Crispin <blogic@openwrt.org>
+Date: Sun, 27 Jul 2014 11:00:32 +0100
+Subject: [PATCH 28/53] GPIO: ralink: add mt7621 gpio controller
+
+Signed-off-by: John Crispin <blogic@openwrt.org>
+---
+ arch/mips/Kconfig | 3 +
+ drivers/gpio/Kconfig | 6 +
+ drivers/gpio/Makefile | 1 +
+ drivers/gpio/gpio-mt7621.c | 354 ++++++++++++++++++++++++++++++++++++++++++++
+ 4 files changed, 364 insertions(+)
+ create mode 100644 drivers/gpio/gpio-mt7621.c
+
+diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
+index 0098bff..94ea345 100644
+--- a/arch/mips/Kconfig
++++ b/arch/mips/Kconfig
+@@ -559,6 +559,9 @@ 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)"
+diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
+index 4a3e7df..13f860c 100644
+--- a/drivers/gpio/Kconfig
++++ b/drivers/gpio/Kconfig
+@@ -269,6 +269,12 @@ config GPIO_MB86S7X
+ help
+ Say yes here to support the GPIO controller in Fujitsu MB86S70 SoCs.
+
++config GPIO_MT7621
++ bool "Mediatek GPIO Support"
++ depends on SOC_MT7620 || SOC_MT7621
++ help
++ Say yes here to support the Mediatek SoC GPIO device
++
+ config GPIO_MM_LANTIQ
+ bool "Lantiq Memory mapped GPIOs"
+ depends on LANTIQ && SOC_XWAY
+diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
+index 13448d78..5563d6e 100644
+--- a/drivers/gpio/Makefile
++++ b/drivers/gpio/Makefile
+@@ -119,3 +119,4 @@ obj-$(CONFIG_GPIO_XTENSA) += gpio-xtensa.o
+ obj-$(CONFIG_GPIO_ZEVIO) += gpio-zevio.o
+ obj-$(CONFIG_GPIO_ZYNQ) += gpio-zynq.o
+ obj-$(CONFIG_GPIO_ZX) += gpio-zx.o
++obj-$(CONFIG_GPIO_MT7621) += gpio-mt7621.o
+diff --git a/drivers/gpio/gpio-mt7621.c b/drivers/gpio/gpio-mt7621.c
+new file mode 100644
+index 0000000..7a98b94
+--- /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 <juhosg@openwrt.org>
++ * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
++ */
++
++#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_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);
+--
+1.7.10.4
+
projects / openwrt.git / blobdiff