+++ /dev/null
-From 69fdd2c4f937796b934e89c33acde9d082e27bfd Mon Sep 17 00:00:00 2001
-From: John Crispin <blogic@openwrt.org>
-Date: Mon, 4 Aug 2014 20:36:29 +0200
-Subject: [PATCH 27/53] GPIO: MIPS: ralink: add gpio driver for ralink SoC
-
-Add gpio driver for Ralink SoC. This driver makes the gpio core on
-RT2880, RT305x, rt3352, rt3662, rt3883, rt5350 and mt7620 work.
-
-Signed-off-by: John Crispin <blogic@openwrt.org>
-Cc: linux-mips@linux-mips.org
-Cc: linux-gpio@vger.kernel.org
----
- arch/mips/include/asm/mach-ralink/gpio.h | 24 ++
- drivers/gpio/Kconfig | 6 +
- drivers/gpio/Makefile | 1 +
- drivers/gpio/gpio-ralink.c | 355 ++++++++++++++++++++++++++++++
- 4 files changed, 386 insertions(+)
- create mode 100644 arch/mips/include/asm/mach-ralink/gpio.h
- create mode 100644 drivers/gpio/gpio-ralink.c
-
---- /dev/null
-+++ b/arch/mips/include/asm/mach-ralink/gpio.h
-@@ -0,0 +1,24 @@
-+/*
-+ * Ralink SoC GPIO API support
-+ *
-+ * Copyright (C) 2008-2009 Gabor Juhos <juhosg@openwrt.org>
-+ * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
-+ *
-+ * 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.
-+ *
-+ */
-+
-+#ifndef __ASM_MACH_RALINK_GPIO_H
-+#define __ASM_MACH_RALINK_GPIO_H
-+
-+#define ARCH_NR_GPIOS 128
-+#include <asm-generic/gpio.h>
-+
-+#define gpio_get_value __gpio_get_value
-+#define gpio_set_value __gpio_set_value
-+#define gpio_cansleep __gpio_cansleep
-+#define gpio_to_irq __gpio_to_irq
-+
-+#endif /* __ASM_MACH_RALINK_GPIO_H */
---- a/drivers/gpio/Kconfig
-+++ b/drivers/gpio/Kconfig
-@@ -398,6 +398,12 @@ config GPIO_REG
- A 32-bit single register GPIO fixed in/out implementation. This
- can be used to represent any register as a set of GPIO signals.
-
-+config GPIO_RALINK
-+ bool "Ralink GPIO Support"
-+ depends on RALINK
-+ help
-+ Say yes here to support the Ralink SoC GPIO device
-+
- config GPIO_SPEAR_SPICS
- bool "ST SPEAr13xx SPI Chip Select as GPIO support"
- depends on PLAT_SPEAR
---- a/drivers/gpio/Makefile
-+++ b/drivers/gpio/Makefile
-@@ -98,6 +98,7 @@ obj-$(CONFIG_GPIO_PCI_IDIO_16) += gpio-p
- obj-$(CONFIG_GPIO_PISOSR) += gpio-pisosr.o
- obj-$(CONFIG_GPIO_PL061) += gpio-pl061.o
- obj-$(CONFIG_GPIO_PXA) += gpio-pxa.o
-+obj-$(CONFIG_GPIO_RALINK) += gpio-ralink.o
- obj-$(CONFIG_GPIO_RC5T583) += gpio-rc5t583.o
- obj-$(CONFIG_GPIO_RDC321X) += gpio-rdc321x.o
- obj-$(CONFIG_GPIO_RCAR) += gpio-rcar.o
---- /dev/null
-+++ b/drivers/gpio/gpio-ralink.c
-@@ -0,0 +1,355 @@
-+/*
-+ * 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/module.h>
-+#include <linux/io.h>
-+#include <linux/gpio.h>
-+#include <linux/spinlock.h>
-+#include <linux/platform_device.h>
-+#include <linux/of_irq.h>
-+#include <linux/irqdomain.h>
-+#include <linux/interrupt.h>
-+
-+enum ralink_gpio_reg {
-+ GPIO_REG_INT = 0,
-+ GPIO_REG_EDGE,
-+ GPIO_REG_RENA,
-+ GPIO_REG_FENA,
-+ GPIO_REG_DATA,
-+ GPIO_REG_DIR,
-+ GPIO_REG_POL,
-+ GPIO_REG_SET,
-+ GPIO_REG_RESET,
-+ GPIO_REG_TOGGLE,
-+ GPIO_REG_MAX
-+};
-+
-+struct ralink_gpio_chip {
-+ struct gpio_chip chip;
-+ u8 regs[GPIO_REG_MAX];
-+
-+ spinlock_t lock;
-+ void __iomem *membase;
-+ struct irq_domain *domain;
-+ int irq;
-+
-+ u32 rising;
-+ u32 falling;
-+};
-+
-+#define MAP_MAX 4
-+static struct irq_domain *irq_map[MAP_MAX];
-+static int irq_map_count;
-+static atomic_t irq_refcount = ATOMIC_INIT(0);
-+
-+static inline struct ralink_gpio_chip *to_ralink_gpio(struct gpio_chip *chip)
-+{
-+ struct ralink_gpio_chip *rg;
-+
-+ rg = container_of(chip, struct ralink_gpio_chip, chip);
-+
-+ return rg;
-+}
-+
-+static inline void rt_gpio_w32(struct ralink_gpio_chip *rg, u8 reg, u32 val)
-+{
-+ iowrite32(val, rg->membase + rg->regs[reg]);
-+}
-+
-+static inline u32 rt_gpio_r32(struct ralink_gpio_chip *rg, u8 reg)
-+{
-+ return ioread32(rg->membase + rg->regs[reg]);
-+}
-+
-+static void ralink_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
-+{
-+ struct ralink_gpio_chip *rg = to_ralink_gpio(chip);
-+
-+ rt_gpio_w32(rg, (value) ? GPIO_REG_SET : GPIO_REG_RESET, BIT(offset));
-+}
-+
-+static int ralink_gpio_get(struct gpio_chip *chip, unsigned offset)
-+{
-+ struct ralink_gpio_chip *rg = to_ralink_gpio(chip);
-+
-+ return !!(rt_gpio_r32(rg, GPIO_REG_DATA) & BIT(offset));
-+}
-+
-+static int ralink_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
-+{
-+ struct ralink_gpio_chip *rg = to_ralink_gpio(chip);
-+ unsigned long flags;
-+ u32 t;
-+
-+ spin_lock_irqsave(&rg->lock, flags);
-+ t = rt_gpio_r32(rg, GPIO_REG_DIR);
-+ t &= ~BIT(offset);
-+ rt_gpio_w32(rg, GPIO_REG_DIR, t);
-+ spin_unlock_irqrestore(&rg->lock, flags);
-+
-+ return 0;
-+}
-+
-+static int ralink_gpio_direction_output(struct gpio_chip *chip,
-+ unsigned offset, int value)
-+{
-+ struct ralink_gpio_chip *rg = to_ralink_gpio(chip);
-+ unsigned long flags;
-+ u32 t;
-+
-+ spin_lock_irqsave(&rg->lock, flags);
-+ ralink_gpio_set(chip, offset, value);
-+ t = rt_gpio_r32(rg, GPIO_REG_DIR);
-+ t |= BIT(offset);
-+ rt_gpio_w32(rg, GPIO_REG_DIR, t);
-+ spin_unlock_irqrestore(&rg->lock, flags);
-+
-+ return 0;
-+}
-+
-+static int ralink_gpio_to_irq(struct gpio_chip *chip, unsigned pin)
-+{
-+ struct ralink_gpio_chip *rg = to_ralink_gpio(chip);
-+
-+ if (rg->irq < 1)
-+ return -1;
-+
-+ return irq_create_mapping(rg->domain, pin);
-+}
-+
-+static void ralink_gpio_irq_handler(struct irq_desc *desc)
-+{
-+ int i;
-+
-+ for (i = 0; i < irq_map_count; i++) {
-+ struct irq_domain *domain = irq_map[i];
-+ struct ralink_gpio_chip *rg;
-+ unsigned long pending;
-+ int bit;
-+
-+ rg = (struct ralink_gpio_chip *) domain->host_data;
-+ pending = rt_gpio_r32(rg, GPIO_REG_INT);
-+
-+ for_each_set_bit(bit, &pending, rg->chip.ngpio) {
-+ u32 map = irq_find_mapping(domain, bit);
-+ generic_handle_irq(map);
-+ rt_gpio_w32(rg, GPIO_REG_INT, BIT(bit));
-+ }
-+ }
-+}
-+
-+static void ralink_gpio_irq_unmask(struct irq_data *d)
-+{
-+ struct ralink_gpio_chip *rg;
-+ unsigned long flags;
-+ u32 rise, fall;
-+
-+ rg = (struct ralink_gpio_chip *) d->domain->host_data;
-+ rise = rt_gpio_r32(rg, GPIO_REG_RENA);
-+ fall = rt_gpio_r32(rg, GPIO_REG_FENA);
-+
-+ spin_lock_irqsave(&rg->lock, flags);
-+ rt_gpio_w32(rg, GPIO_REG_RENA, rise | (BIT(d->hwirq) & rg->rising));
-+ rt_gpio_w32(rg, GPIO_REG_FENA, fall | (BIT(d->hwirq) & rg->falling));
-+ spin_unlock_irqrestore(&rg->lock, flags);
-+}
-+
-+static void ralink_gpio_irq_mask(struct irq_data *d)
-+{
-+ struct ralink_gpio_chip *rg;
-+ unsigned long flags;
-+ u32 rise, fall;
-+
-+ rg = (struct ralink_gpio_chip *) d->domain->host_data;
-+ rise = rt_gpio_r32(rg, GPIO_REG_RENA);
-+ fall = rt_gpio_r32(rg, GPIO_REG_FENA);
-+
-+ spin_lock_irqsave(&rg->lock, flags);
-+ rt_gpio_w32(rg, GPIO_REG_FENA, fall & ~BIT(d->hwirq));
-+ rt_gpio_w32(rg, GPIO_REG_RENA, rise & ~BIT(d->hwirq));
-+ spin_unlock_irqrestore(&rg->lock, flags);
-+}
-+
-+static int ralink_gpio_irq_type(struct irq_data *d, unsigned int type)
-+{
-+ struct ralink_gpio_chip *rg;
-+ u32 mask = BIT(d->hwirq);
-+
-+ rg = (struct ralink_gpio_chip *) d->domain->host_data;
-+
-+ 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 ralink_gpio_irq_chip = {
-+ .name = "GPIO",
-+ .irq_unmask = ralink_gpio_irq_unmask,
-+ .irq_mask = ralink_gpio_irq_mask,
-+ .irq_mask_ack = ralink_gpio_irq_mask,
-+ .irq_set_type = ralink_gpio_irq_type,
-+};
-+
-+static int gpio_map(struct irq_domain *d, unsigned int irq, irq_hw_number_t hw)
-+{
-+ irq_set_chip_and_handler(irq, &ralink_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 = gpio_map,
-+};
-+
-+static void ralink_gpio_irq_init(struct device_node *np,
-+ struct ralink_gpio_chip *rg)
-+{
-+ if (irq_map_count >= MAP_MAX)
-+ return;
-+
-+ rg->irq = irq_of_parse_and_map(np, 0);
-+ if (!rg->irq)
-+ return;
-+
-+ rg->domain = irq_domain_add_linear(np, rg->chip.ngpio,
-+ &irq_domain_ops, rg);
-+ if (!rg->domain) {
-+ dev_err(rg->chip.parent, "irq_domain_add_linear failed\n");
-+ return;
-+ }
-+
-+ irq_map[irq_map_count++] = rg->domain;
-+
-+ rt_gpio_w32(rg, GPIO_REG_RENA, 0x0);
-+ rt_gpio_w32(rg, GPIO_REG_FENA, 0x0);
-+
-+ if (!atomic_read(&irq_refcount))
-+ irq_set_chained_handler(rg->irq, ralink_gpio_irq_handler);
-+ atomic_inc(&irq_refcount);
-+
-+ dev_info(rg->chip.parent, "registering %d irq handlers\n", rg->chip.ngpio);
-+}
-+
-+static int ralink_gpio_request(struct gpio_chip *chip, unsigned offset)
-+{
-+ int gpio = chip->base + offset;
-+
-+ return pinctrl_request_gpio(gpio);
-+}
-+
-+static void ralink_gpio_free(struct gpio_chip *chip, unsigned offset)
-+{
-+ int gpio = chip->base + offset;
-+
-+ pinctrl_free_gpio(gpio);
-+}
-+
-+static int ralink_gpio_probe(struct platform_device *pdev)
-+{
-+ struct device_node *np = pdev->dev.of_node;
-+ struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-+ struct ralink_gpio_chip *rg;
-+ const __be32 *ngpio, *gpiobase;
-+
-+ if (!res) {
-+ dev_err(&pdev->dev, "failed to find resource\n");
-+ return -ENOMEM;
-+ }
-+
-+ rg = devm_kzalloc(&pdev->dev,
-+ sizeof(struct ralink_gpio_chip), GFP_KERNEL);
-+ if (!rg)
-+ return -ENOMEM;
-+
-+ rg->membase = devm_ioremap_resource(&pdev->dev, res);
-+ if (!rg->membase) {
-+ dev_err(&pdev->dev, "cannot remap I/O memory region\n");
-+ return -ENOMEM;
-+ }
-+
-+ if (of_property_read_u8_array(np, "ralink,register-map",
-+ rg->regs, GPIO_REG_MAX)) {
-+ dev_err(&pdev->dev, "failed to read register definition\n");
-+ return -EINVAL;
-+ }
-+
-+ ngpio = of_get_property(np, "ralink,num-gpios", NULL);
-+ if (!ngpio) {
-+ dev_err(&pdev->dev, "failed to read number of pins\n");
-+ return -EINVAL;
-+ }
-+
-+ gpiobase = of_get_property(np, "ralink,gpio-base", NULL);
-+ if (gpiobase)
-+ rg->chip.base = be32_to_cpu(*gpiobase);
-+ else
-+ rg->chip.base = -1;
-+
-+ spin_lock_init(&rg->lock);
-+
-+ rg->chip.parent = &pdev->dev;
-+ rg->chip.label = dev_name(&pdev->dev);
-+ rg->chip.of_node = np;
-+ rg->chip.ngpio = be32_to_cpu(*ngpio);
-+ rg->chip.direction_input = ralink_gpio_direction_input;
-+ rg->chip.direction_output = ralink_gpio_direction_output;
-+ rg->chip.get = ralink_gpio_get;
-+ rg->chip.set = ralink_gpio_set;
-+ rg->chip.request = ralink_gpio_request;
-+ rg->chip.to_irq = ralink_gpio_to_irq;
-+ rg->chip.free = ralink_gpio_free;
-+
-+ /* set polarity to low for all lines */
-+ rt_gpio_w32(rg, GPIO_REG_POL, 0);
-+
-+ dev_info(&pdev->dev, "registering %d gpios\n", rg->chip.ngpio);
-+
-+ ralink_gpio_irq_init(np, rg);
-+
-+ return gpiochip_add(&rg->chip);
-+}
-+
-+static const struct of_device_id ralink_gpio_match[] = {
-+ { .compatible = "ralink,rt2880-gpio" },
-+ {},
-+};
-+MODULE_DEVICE_TABLE(of, ralink_gpio_match);
-+
-+static struct platform_driver ralink_gpio_driver = {
-+ .probe = ralink_gpio_probe,
-+ .driver = {
-+ .name = "rt2880_gpio",
-+ .owner = THIS_MODULE,
-+ .of_match_table = ralink_gpio_match,
-+ },
-+};
-+
-+static int __init ralink_gpio_init(void)
-+{
-+ return platform_driver_register(&ralink_gpio_driver);
-+}
-+
-+subsys_initcall(ralink_gpio_init);
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