Fixed MTP to work with TWRP

drivers/gpio/gpio-mvebu.c

@@ -0,0 +1,747 @@
+/*
+ * GPIO driver for Marvell SoCs
+ *
+ * Copyright (C) 2012 Marvell
+ *
+ * Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
+ * Andrew Lunn <andrew@lunn.ch>
+ * Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2.  This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ *
+ * This driver is a fairly straightforward GPIO driver for the
+ * complete family of Marvell EBU SoC platforms (Orion, Dove,
+ * Kirkwood, Discovery, Armada 370/XP). The only complexity of this
+ * driver is the different register layout that exists between the
+ * non-SMP platforms (Orion, Dove, Kirkwood, Armada 370) and the SMP
+ * platforms (MV78200 from the Discovery family and the Armada
+ * XP). Therefore, this driver handles three variants of the GPIO
+ * block:
+ * - the basic variant, called "orion-gpio", with the simplest
+ *   register set. Used on Orion, Dove, Kirkwoord, Armada 370 and
+ *   non-SMP Discovery systems
+ * - the mv78200 variant for MV78200 Discovery systems. This variant
+ *   turns the edge mask and level mask registers into CPU0 edge
+ *   mask/level mask registers, and adds CPU1 edge mask/level mask
+ *   registers.
+ * - the armadaxp variant for Armada XP systems. This variant keeps
+ *   the normal cause/edge mask/level mask registers when the global
+ *   interrupts are used, but adds per-CPU cause/edge mask/level mask
+ *   registers n a separate memory area for the per-CPU GPIO
+ *   interrupts.
+ */
+
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/gpio.h>
+#include <linux/irq.h>
+#include <linux/slab.h>
+#include <linux/irqdomain.h>
+#include <linux/io.h>
+#include <linux/of_irq.h>
+#include <linux/of_device.h>
+#include <linux/clk.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/irqchip/chained_irq.h>
+
+/*
+ * GPIO unit register offsets.
+ */
+#define GPIO_OUT_OFF		0x0000
+#define GPIO_IO_CONF_OFF	0x0004
+#define GPIO_BLINK_EN_OFF	0x0008
+#define GPIO_IN_POL_OFF		0x000c
+#define GPIO_DATA_IN_OFF	0x0010
+#define GPIO_EDGE_CAUSE_OFF	0x0014
+#define GPIO_EDGE_MASK_OFF	0x0018
+#define GPIO_LEVEL_MASK_OFF	0x001c
+
+/* The MV78200 has per-CPU registers for edge mask and level mask */
+#define GPIO_EDGE_MASK_MV78200_OFF(cpu)   ((cpu) ? 0x30 : 0x18)
+#define GPIO_LEVEL_MASK_MV78200_OFF(cpu)  ((cpu) ? 0x34 : 0x1C)
+
+/* The Armada XP has per-CPU registers for interrupt cause, interrupt
+ * mask and interrupt level mask. Those are relative to the
+ * percpu_membase. */
+#define GPIO_EDGE_CAUSE_ARMADAXP_OFF(cpu) ((cpu) * 0x4)
+#define GPIO_EDGE_MASK_ARMADAXP_OFF(cpu)  (0x10 + (cpu) * 0x4)
+#define GPIO_LEVEL_MASK_ARMADAXP_OFF(cpu) (0x20 + (cpu) * 0x4)
+
+#define MVEBU_GPIO_SOC_VARIANT_ORION    0x1
+#define MVEBU_GPIO_SOC_VARIANT_MV78200  0x2
+#define MVEBU_GPIO_SOC_VARIANT_ARMADAXP 0x3
+
+#define MVEBU_MAX_GPIO_PER_BANK         32
+
+struct mvebu_gpio_chip {
+	struct gpio_chip   chip;
+	spinlock_t	   lock;
+	void __iomem	  *membase;
+	void __iomem	  *percpu_membase;
+	int		   irqbase;
+	struct irq_domain *domain;
+	int                soc_variant;
+};
+
+/*
+ * Functions returning addresses of individual registers for a given
+ * GPIO controller.
+ */
+static inline void __iomem *mvebu_gpioreg_out(struct mvebu_gpio_chip *mvchip)
+{
+	return mvchip->membase + GPIO_OUT_OFF;
+}
+
+static inline void __iomem *mvebu_gpioreg_blink(struct mvebu_gpio_chip *mvchip)
+{
+	return mvchip->membase + GPIO_BLINK_EN_OFF;
+}
+
+static inline void __iomem *mvebu_gpioreg_io_conf(struct mvebu_gpio_chip *mvchip)
+{
+	return mvchip->membase + GPIO_IO_CONF_OFF;
+}
+
+static inline void __iomem *mvebu_gpioreg_in_pol(struct mvebu_gpio_chip *mvchip)
+{
+	return mvchip->membase + GPIO_IN_POL_OFF;
+}
+
+static inline void __iomem *mvebu_gpioreg_data_in(struct mvebu_gpio_chip *mvchip)
+{
+	return mvchip->membase + GPIO_DATA_IN_OFF;
+}
+
+static inline void __iomem *mvebu_gpioreg_edge_cause(struct mvebu_gpio_chip *mvchip)
+{
+	int cpu;
+
+	switch (mvchip->soc_variant) {
+	case MVEBU_GPIO_SOC_VARIANT_ORION:
+	case MVEBU_GPIO_SOC_VARIANT_MV78200:
+		return mvchip->membase + GPIO_EDGE_CAUSE_OFF;
+	case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
+		cpu = smp_processor_id();
+		return mvchip->percpu_membase + GPIO_EDGE_CAUSE_ARMADAXP_OFF(cpu);
+	default:
+		BUG();
+	}
+}
+
+static inline void __iomem *mvebu_gpioreg_edge_mask(struct mvebu_gpio_chip *mvchip)
+{
+	int cpu;
+
+	switch (mvchip->soc_variant) {
+	case MVEBU_GPIO_SOC_VARIANT_ORION:
+		return mvchip->membase + GPIO_EDGE_MASK_OFF;
+	case MVEBU_GPIO_SOC_VARIANT_MV78200:
+		cpu = smp_processor_id();
+		return mvchip->membase + GPIO_EDGE_MASK_MV78200_OFF(cpu);
+	case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
+		cpu = smp_processor_id();
+		return mvchip->percpu_membase + GPIO_EDGE_MASK_ARMADAXP_OFF(cpu);
+	default:
+		BUG();
+	}
+}
+
+static void __iomem *mvebu_gpioreg_level_mask(struct mvebu_gpio_chip *mvchip)
+{
+	int cpu;
+
+	switch (mvchip->soc_variant) {
+	case MVEBU_GPIO_SOC_VARIANT_ORION:
+		return mvchip->membase + GPIO_LEVEL_MASK_OFF;
+	case MVEBU_GPIO_SOC_VARIANT_MV78200:
+		cpu = smp_processor_id();
+		return mvchip->membase + GPIO_LEVEL_MASK_MV78200_OFF(cpu);
+	case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
+		cpu = smp_processor_id();
+		return mvchip->percpu_membase + GPIO_LEVEL_MASK_ARMADAXP_OFF(cpu);
+	default:
+		BUG();
+	}
+}
+
+/*
+ * Functions implementing the gpio_chip methods
+ */
+
+static int mvebu_gpio_request(struct gpio_chip *chip, unsigned pin)
+{
+	return pinctrl_request_gpio(chip->base + pin);
+}
+
+static void mvebu_gpio_free(struct gpio_chip *chip, unsigned pin)
+{
+	pinctrl_free_gpio(chip->base + pin);
+}
+
+static void mvebu_gpio_set(struct gpio_chip *chip, unsigned pin, int value)
+{
+	struct mvebu_gpio_chip *mvchip =
+		container_of(chip, struct mvebu_gpio_chip, chip);
+	unsigned long flags;
+	u32 u;
+
+	spin_lock_irqsave(&mvchip->lock, flags);
+	u = readl_relaxed(mvebu_gpioreg_out(mvchip));
+	if (value)
+		u |= 1 << pin;
+	else
+		u &= ~(1 << pin);
+	writel_relaxed(u, mvebu_gpioreg_out(mvchip));
+	spin_unlock_irqrestore(&mvchip->lock, flags);
+}
+
+static int mvebu_gpio_get(struct gpio_chip *chip, unsigned pin)
+{
+	struct mvebu_gpio_chip *mvchip =
+		container_of(chip, struct mvebu_gpio_chip, chip);
+	u32 u;
+
+	if (readl_relaxed(mvebu_gpioreg_io_conf(mvchip)) & (1 << pin)) {
+		u = readl_relaxed(mvebu_gpioreg_data_in(mvchip)) ^
+			readl_relaxed(mvebu_gpioreg_in_pol(mvchip));
+	} else {
+		u = readl_relaxed(mvebu_gpioreg_out(mvchip));
+	}
+
+	return (u >> pin) & 1;
+}
+
+static void mvebu_gpio_blink(struct gpio_chip *chip, unsigned pin, int value)
+{
+	struct mvebu_gpio_chip *mvchip =
+		container_of(chip, struct mvebu_gpio_chip, chip);
+	unsigned long flags;
+	u32 u;
+
+	spin_lock_irqsave(&mvchip->lock, flags);
+	u = readl_relaxed(mvebu_gpioreg_blink(mvchip));
+	if (value)
+		u |= 1 << pin;
+	else
+		u &= ~(1 << pin);
+	writel_relaxed(u, mvebu_gpioreg_blink(mvchip));
+	spin_unlock_irqrestore(&mvchip->lock, flags);
+}
+
+static int mvebu_gpio_direction_input(struct gpio_chip *chip, unsigned pin)
+{
+	struct mvebu_gpio_chip *mvchip =
+		container_of(chip, struct mvebu_gpio_chip, chip);
+	unsigned long flags;
+	int ret;
+	u32 u;
+
+	/* Check with the pinctrl driver whether this pin is usable as
+	 * an input GPIO */
+	ret = pinctrl_gpio_direction_input(chip->base + pin);
+	if (ret)
+		return ret;
+
+	spin_lock_irqsave(&mvchip->lock, flags);
+	u = readl_relaxed(mvebu_gpioreg_io_conf(mvchip));
+	u |= 1 << pin;
+	writel_relaxed(u, mvebu_gpioreg_io_conf(mvchip));
+	spin_unlock_irqrestore(&mvchip->lock, flags);
+
+	return 0;
+}
+
+static int mvebu_gpio_direction_output(struct gpio_chip *chip, unsigned pin,
+				       int value)
+{
+	struct mvebu_gpio_chip *mvchip =
+		container_of(chip, struct mvebu_gpio_chip, chip);
+	unsigned long flags;
+	int ret;
+	u32 u;
+
+	/* Check with the pinctrl driver whether this pin is usable as
+	 * an output GPIO */
+	ret = pinctrl_gpio_direction_output(chip->base + pin);
+	if (ret)
+		return ret;
+
+	mvebu_gpio_blink(chip, pin, 0);
+	mvebu_gpio_set(chip, pin, value);
+
+	spin_lock_irqsave(&mvchip->lock, flags);
+	u = readl_relaxed(mvebu_gpioreg_io_conf(mvchip));
+	u &= ~(1 << pin);
+	writel_relaxed(u, mvebu_gpioreg_io_conf(mvchip));
+	spin_unlock_irqrestore(&mvchip->lock, flags);
+
+	return 0;
+}
+
+static int mvebu_gpio_to_irq(struct gpio_chip *chip, unsigned pin)
+{
+	struct mvebu_gpio_chip *mvchip =
+		container_of(chip, struct mvebu_gpio_chip, chip);
+	return irq_create_mapping(mvchip->domain, pin);
+}
+
+/*
+ * Functions implementing the irq_chip methods
+ */
+static void mvebu_gpio_irq_ack(struct irq_data *d)
+{
+	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
+	struct mvebu_gpio_chip *mvchip = gc->private;
+	u32 mask = ~(1 << (d->irq - gc->irq_base));
+
+	irq_gc_lock(gc);
+	writel_relaxed(mask, mvebu_gpioreg_edge_cause(mvchip));
+	irq_gc_unlock(gc);
+}
+
+static void mvebu_gpio_edge_irq_mask(struct irq_data *d)
+{
+	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
+	struct mvebu_gpio_chip *mvchip = gc->private;
+	struct irq_chip_type *ct = irq_data_get_chip_type(d);
+	u32 mask = 1 << (d->irq - gc->irq_base);
+
+	irq_gc_lock(gc);
+	ct->mask_cache_priv &= ~mask;
+
+	writel_relaxed(ct->mask_cache_priv, mvebu_gpioreg_edge_mask(mvchip));
+	irq_gc_unlock(gc);
+}
+
+static void mvebu_gpio_edge_irq_unmask(struct irq_data *d)
+{
+	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
+	struct mvebu_gpio_chip *mvchip = gc->private;
+	struct irq_chip_type *ct = irq_data_get_chip_type(d);
+
+	u32 mask = 1 << (d->irq - gc->irq_base);
+
+	irq_gc_lock(gc);
+	ct->mask_cache_priv |= mask;
+	writel_relaxed(ct->mask_cache_priv, mvebu_gpioreg_edge_mask(mvchip));
+	irq_gc_unlock(gc);
+}
+
+static void mvebu_gpio_level_irq_mask(struct irq_data *d)
+{
+	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
+	struct mvebu_gpio_chip *mvchip = gc->private;
+	struct irq_chip_type *ct = irq_data_get_chip_type(d);
+
+	u32 mask = 1 << (d->irq - gc->irq_base);
+
+	irq_gc_lock(gc);
+	ct->mask_cache_priv &= ~mask;
+	writel_relaxed(ct->mask_cache_priv, mvebu_gpioreg_level_mask(mvchip));
+	irq_gc_unlock(gc);
+}
+
+static void mvebu_gpio_level_irq_unmask(struct irq_data *d)
+{
+	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
+	struct mvebu_gpio_chip *mvchip = gc->private;
+	struct irq_chip_type *ct = irq_data_get_chip_type(d);
+
+	u32 mask = 1 << (d->irq - gc->irq_base);
+
+	irq_gc_lock(gc);
+	ct->mask_cache_priv |= mask;
+	writel_relaxed(ct->mask_cache_priv, mvebu_gpioreg_level_mask(mvchip));
+	irq_gc_unlock(gc);
+}
+
+/*****************************************************************************
+ * MVEBU GPIO IRQ
+ *
+ * GPIO_IN_POL register controls whether GPIO_DATA_IN will hold the same
+ * value of the line or the opposite value.
+ *
+ * Level IRQ handlers: DATA_IN is used directly as cause register.
+ *                     Interrupt are masked by LEVEL_MASK registers.
+ * Edge IRQ handlers:  Change in DATA_IN are latched in EDGE_CAUSE.
+ *                     Interrupt are masked by EDGE_MASK registers.
+ * Both-edge handlers: Similar to regular Edge handlers, but also swaps
+ *                     the polarity to catch the next line transaction.
+ *                     This is a race condition that might not perfectly
+ *                     work on some use cases.
+ *
+ * Every eight GPIO lines are grouped (OR'ed) before going up to main
+ * cause register.
+ *
+ *                    EDGE  cause    mask
+ *        data-in   /--------| |-----| |----\
+ *     -----| |-----                         ---- to main cause reg
+ *           X      \----------------| |----/
+ *        polarity    LEVEL          mask
+ *
+ ****************************************************************************/
+
+static int mvebu_gpio_irq_set_type(struct irq_data *d, unsigned int type)
+{
+	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
+	struct irq_chip_type *ct = irq_data_get_chip_type(d);
+	struct mvebu_gpio_chip *mvchip = gc->private;
+	int pin;
+	u32 u;
+
+	pin = d->hwirq;
+
+	u = readl_relaxed(mvebu_gpioreg_io_conf(mvchip)) & (1 << pin);
+	if (!u) {
+		return -EINVAL;
+	}
+
+	type &= IRQ_TYPE_SENSE_MASK;
+	if (type == IRQ_TYPE_NONE)
+		return -EINVAL;
+
+	/* Check if we need to change chip and handler */
+	if (!(ct->type & type))
+		if (irq_setup_alt_chip(d, type))
+			return -EINVAL;
+
+	/*
+	 * Configure interrupt polarity.
+	 */
+	switch (type) {
+	case IRQ_TYPE_EDGE_RISING:
+	case IRQ_TYPE_LEVEL_HIGH:
+		u = readl_relaxed(mvebu_gpioreg_in_pol(mvchip));
+		u &= ~(1 << pin);
+		writel_relaxed(u, mvebu_gpioreg_in_pol(mvchip));
+		break;
+	case IRQ_TYPE_EDGE_FALLING:
+	case IRQ_TYPE_LEVEL_LOW:
+		u = readl_relaxed(mvebu_gpioreg_in_pol(mvchip));
+		u |= 1 << pin;
+		writel_relaxed(u, mvebu_gpioreg_in_pol(mvchip));
+		break;
+	case IRQ_TYPE_EDGE_BOTH: {
+		u32 v;
+
+		v = readl_relaxed(mvebu_gpioreg_in_pol(mvchip)) ^
+			readl_relaxed(mvebu_gpioreg_data_in(mvchip));
+
+		/*
+		 * set initial polarity based on current input level
+		 */
+		u = readl_relaxed(mvebu_gpioreg_in_pol(mvchip));
+		if (v & (1 << pin))
+			u |= 1 << pin;		/* falling */
+		else
+			u &= ~(1 << pin);	/* rising */
+		writel_relaxed(u, mvebu_gpioreg_in_pol(mvchip));
+		break;
+	}
+	}
+	return 0;
+}
+
+static void mvebu_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
+{
+	struct mvebu_gpio_chip *mvchip = irq_get_handler_data(irq);
+	struct irq_chip *chip = irq_desc_get_chip(desc);
+	u32 cause, type;
+	int i;
+
+	if (mvchip == NULL)
+		return;
+
+	chained_irq_enter(chip, desc);
+
+	cause = readl_relaxed(mvebu_gpioreg_data_in(mvchip)) &
+		readl_relaxed(mvebu_gpioreg_level_mask(mvchip));
+	cause |= readl_relaxed(mvebu_gpioreg_edge_cause(mvchip)) &
+		readl_relaxed(mvebu_gpioreg_edge_mask(mvchip));
+
+	for (i = 0; i < mvchip->chip.ngpio; i++) {
+		int irq;
+
+		irq = mvchip->irqbase + i;
+
+		if (!(cause & (1 << i)))
+			continue;
+
+		type = irq_get_trigger_type(irq);
+		if ((type & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH) {
+			/* Swap polarity (race with GPIO line) */
+			u32 polarity;
+
+			polarity = readl_relaxed(mvebu_gpioreg_in_pol(mvchip));
+			polarity ^= 1 << i;
+			writel_relaxed(polarity, mvebu_gpioreg_in_pol(mvchip));
+		}
+
+		generic_handle_irq(irq);
+	}
+
+	chained_irq_exit(chip, desc);
+}
+
+#ifdef CONFIG_DEBUG_FS
+#include <linux/seq_file.h>
+
+static void mvebu_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
+{
+	struct mvebu_gpio_chip *mvchip =
+		container_of(chip, struct mvebu_gpio_chip, chip);
+	u32 out, io_conf, blink, in_pol, data_in, cause, edg_msk, lvl_msk;
+	int i;
+
+	out	= readl_relaxed(mvebu_gpioreg_out(mvchip));
+	io_conf	= readl_relaxed(mvebu_gpioreg_io_conf(mvchip));
+	blink	= readl_relaxed(mvebu_gpioreg_blink(mvchip));
+	in_pol	= readl_relaxed(mvebu_gpioreg_in_pol(mvchip));
+	data_in	= readl_relaxed(mvebu_gpioreg_data_in(mvchip));
+	cause	= readl_relaxed(mvebu_gpioreg_edge_cause(mvchip));
+	edg_msk	= readl_relaxed(mvebu_gpioreg_edge_mask(mvchip));
+	lvl_msk	= readl_relaxed(mvebu_gpioreg_level_mask(mvchip));
+
+	for (i = 0; i < chip->ngpio; i++) {
+		const char *label;
+		u32 msk;
+		bool is_out;
+
+		label = gpiochip_is_requested(chip, i);
+		if (!label)
+			continue;
+
+		msk = 1 << i;
+		is_out = !(io_conf & msk);
+
+		seq_printf(s, " gpio-%-3d (%-20.20s)", chip->base + i, label);
+
+		if (is_out) {
+			seq_printf(s, " out %s %s\n",
+				   out & msk ? "hi" : "lo",
+				   blink & msk ? "(blink )" : "");
+			continue;
+		}
+
+		seq_printf(s, " in  %s (act %s) - IRQ",
+			   (data_in ^ in_pol) & msk  ? "hi" : "lo",
+			   in_pol & msk ? "lo" : "hi");
+		if (!((edg_msk | lvl_msk) & msk)) {
+			seq_printf(s, " disabled\n");
+			continue;
+		}
+		if (edg_msk & msk)
+			seq_printf(s, " edge ");
+		if (lvl_msk & msk)
+			seq_printf(s, " level");
+		seq_printf(s, " (%s)\n", cause & msk ? "pending" : "clear  ");
+	}
+}
+#else
+#define mvebu_gpio_dbg_show NULL
+#endif
+
+static const struct of_device_id mvebu_gpio_of_match[] = {
+	{
+		.compatible = "marvell,orion-gpio",
+		.data       = (void *) MVEBU_GPIO_SOC_VARIANT_ORION,
+	},
+	{
+		.compatible = "marvell,mv78200-gpio",
+		.data       = (void *) MVEBU_GPIO_SOC_VARIANT_MV78200,
+	},
+	{
+		.compatible = "marvell,armadaxp-gpio",
+		.data       = (void *) MVEBU_GPIO_SOC_VARIANT_ARMADAXP,
+	},
+	{
+		/* sentinel */
+	},
+};
+MODULE_DEVICE_TABLE(of, mvebu_gpio_of_match);
+
+static int mvebu_gpio_probe(struct platform_device *pdev)
+{
+	struct mvebu_gpio_chip *mvchip;
+	const struct of_device_id *match;
+	struct device_node *np = pdev->dev.of_node;
+	struct resource *res;
+	struct irq_chip_generic *gc;
+	struct irq_chip_type *ct;
+	struct clk *clk;
+	unsigned int ngpios;
+	int soc_variant;
+	int i, cpu, id;
+
+	match = of_match_device(mvebu_gpio_of_match, &pdev->dev);
+	if (match)
+		soc_variant = (int) match->data;
+	else
+		soc_variant = MVEBU_GPIO_SOC_VARIANT_ORION;
+
+	mvchip = devm_kzalloc(&pdev->dev, sizeof(struct mvebu_gpio_chip), GFP_KERNEL);
+	if (!mvchip)
+		return -ENOMEM;
+
+	if (of_property_read_u32(pdev->dev.of_node, "ngpios", &ngpios)) {
+		dev_err(&pdev->dev, "Missing ngpios OF property\n");
+		return -ENODEV;
+	}
+
+	id = of_alias_get_id(pdev->dev.of_node, "gpio");
+	if (id < 0) {
+		dev_err(&pdev->dev, "Couldn't get OF id\n");
+		return id;
+	}
+
+	clk = devm_clk_get(&pdev->dev, NULL);
+	/* Not all SoCs require a clock.*/
+	if (!IS_ERR(clk))
+		clk_prepare_enable(clk);
+
+	mvchip->soc_variant = soc_variant;
+	mvchip->chip.label = dev_name(&pdev->dev);
+	mvchip->chip.dev = &pdev->dev;
+	mvchip->chip.request = mvebu_gpio_request;
+	mvchip->chip.free = mvebu_gpio_free;
+	mvchip->chip.direction_input = mvebu_gpio_direction_input;
+	mvchip->chip.get = mvebu_gpio_get;
+	mvchip->chip.direction_output = mvebu_gpio_direction_output;
+	mvchip->chip.set = mvebu_gpio_set;
+	mvchip->chip.to_irq = mvebu_gpio_to_irq;
+	mvchip->chip.base = id * MVEBU_MAX_GPIO_PER_BANK;
+	mvchip->chip.ngpio = ngpios;
+	mvchip->chip.can_sleep = false;
+	mvchip->chip.of_node = np;
+	mvchip->chip.dbg_show = mvebu_gpio_dbg_show;
+
+	spin_lock_init(&mvchip->lock);
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	mvchip->membase = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(mvchip->membase))
+		return PTR_ERR(mvchip->membase);
+
+	/* The Armada XP has a second range of registers for the
+	 * per-CPU registers */
+	if (soc_variant == MVEBU_GPIO_SOC_VARIANT_ARMADAXP) {
+		res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+		mvchip->percpu_membase = devm_ioremap_resource(&pdev->dev,
+							       res);
+		if (IS_ERR(mvchip->percpu_membase))
+			return PTR_ERR(mvchip->percpu_membase);
+	}
+
+	/*
+	 * Mask and clear GPIO interrupts.
+	 */
+	switch (soc_variant) {
+	case MVEBU_GPIO_SOC_VARIANT_ORION:
+		writel_relaxed(0, mvchip->membase + GPIO_EDGE_CAUSE_OFF);
+		writel_relaxed(0, mvchip->membase + GPIO_EDGE_MASK_OFF);
+		writel_relaxed(0, mvchip->membase + GPIO_LEVEL_MASK_OFF);
+		break;
+	case MVEBU_GPIO_SOC_VARIANT_MV78200:
+		writel_relaxed(0, mvchip->membase + GPIO_EDGE_CAUSE_OFF);
+		for (cpu = 0; cpu < 2; cpu++) {
+			writel_relaxed(0, mvchip->membase +
+				       GPIO_EDGE_MASK_MV78200_OFF(cpu));
+			writel_relaxed(0, mvchip->membase +
+				       GPIO_LEVEL_MASK_MV78200_OFF(cpu));
+		}
+		break;
+	case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
+		writel_relaxed(0, mvchip->membase + GPIO_EDGE_CAUSE_OFF);
+		writel_relaxed(0, mvchip->membase + GPIO_EDGE_MASK_OFF);
+		writel_relaxed(0, mvchip->membase + GPIO_LEVEL_MASK_OFF);
+		for (cpu = 0; cpu < 4; cpu++) {
+			writel_relaxed(0, mvchip->percpu_membase +
+				       GPIO_EDGE_CAUSE_ARMADAXP_OFF(cpu));
+			writel_relaxed(0, mvchip->percpu_membase +
+				       GPIO_EDGE_MASK_ARMADAXP_OFF(cpu));
+			writel_relaxed(0, mvchip->percpu_membase +
+				       GPIO_LEVEL_MASK_ARMADAXP_OFF(cpu));
+		}
+		break;
+	default:
+		BUG();
+	}
+
+	gpiochip_add(&mvchip->chip);
+
+	/* Some gpio controllers do not provide irq support */
+	if (!of_irq_count(np))
+		return 0;
+
+	/* Setup the interrupt handlers. Each chip can have up to 4
+	 * interrupt handlers, with each handler dealing with 8 GPIO
+	 * pins. */
+	for (i = 0; i < 4; i++) {
+		int irq;
+		irq = platform_get_irq(pdev, i);
+		if (irq < 0)
+			continue;
+		irq_set_handler_data(irq, mvchip);
+		irq_set_chained_handler(irq, mvebu_gpio_irq_handler);
+	}
+
+	mvchip->irqbase = irq_alloc_descs(-1, 0, ngpios, -1);
+	if (mvchip->irqbase < 0) {
+		dev_err(&pdev->dev, "no irqs\n");
+		return mvchip->irqbase;
+	}
+
+	gc = irq_alloc_generic_chip("mvebu_gpio_irq", 2, mvchip->irqbase,
+				    mvchip->membase, handle_level_irq);
+	if (!gc) {
+		dev_err(&pdev->dev, "Cannot allocate generic irq_chip\n");
+		return -ENOMEM;
+	}
+
+	gc->private = mvchip;
+	ct = &gc->chip_types[0];
+	ct->type = IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW;
+	ct->chip.irq_mask = mvebu_gpio_level_irq_mask;
+	ct->chip.irq_unmask = mvebu_gpio_level_irq_unmask;
+	ct->chip.irq_set_type = mvebu_gpio_irq_set_type;
+	ct->chip.name = mvchip->chip.label;
+
+	ct = &gc->chip_types[1];
+	ct->type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
+	ct->chip.irq_ack = mvebu_gpio_irq_ack;
+	ct->chip.irq_mask = mvebu_gpio_edge_irq_mask;
+	ct->chip.irq_unmask = mvebu_gpio_edge_irq_unmask;
+	ct->chip.irq_set_type = mvebu_gpio_irq_set_type;
+	ct->handler = handle_edge_irq;
+	ct->chip.name = mvchip->chip.label;
+
+	irq_setup_generic_chip(gc, IRQ_MSK(ngpios), 0,
+			       IRQ_NOREQUEST, IRQ_LEVEL | IRQ_NOPROBE);
+
+	/* Setup irq domain on top of the generic chip. */
+	mvchip->domain = irq_domain_add_simple(np, mvchip->chip.ngpio,
+					       mvchip->irqbase,
+					       &irq_domain_simple_ops,
+					       mvchip);
+	if (!mvchip->domain) {
+		dev_err(&pdev->dev, "couldn't allocate irq domain %s (DT).\n",
+			mvchip->chip.label);
+		irq_remove_generic_chip(gc, IRQ_MSK(ngpios), IRQ_NOREQUEST,
+					IRQ_LEVEL | IRQ_NOPROBE);
+		kfree(gc);
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+static struct platform_driver mvebu_gpio_driver = {
+	.driver		= {
+		.name	        = "mvebu-gpio",
+		.owner	        = THIS_MODULE,
+		.of_match_table = mvebu_gpio_of_match,
+	},
+	.probe		= mvebu_gpio_probe,
+};
+module_platform_driver(mvebu_gpio_driver);