+++ /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
-
---- a/arch/mips/Kconfig
-+++ b/arch/mips/Kconfig
-@@ -631,6 +631,9 @@ 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
-@@ -298,6 +298,12 @@ config GPIO_MENZ127
- help
- Say yes here to support the MEN 16Z127 GPIO Controller
-
-+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
---- a/drivers/gpio/Makefile
-+++ b/drivers/gpio/Makefile
-@@ -152,3 +152,4 @@ obj-$(CONFIG_GPIO_ZEVIO) += gpio-zevio.o
- obj-$(CONFIG_GPIO_ZYNQ) += gpio-zynq.o
- obj-$(CONFIG_GPIO_ZX) += gpio-zx.o
- obj-$(CONFIG_GPIO_LOONGSON1) += gpio-loongson1.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 <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.parent = &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(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);
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