Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 829 insertions, 0 deletions

diff --git a/drivers/gpio/gpio-pxa.c b/drivers/gpio/gpio-pxa.c
new file mode 100644
index 000000000..bcc6be4a5
--- /dev/null
+++ b/drivers/gpio/gpio-pxa.c
@@ -0,0 +1,829 @@
+/*
+ *  linux/arch/arm/plat-pxa/gpio.c
+ *
+ *  Generic PXA GPIO handling
+ *
+ *  Author:	Nicolas Pitre
+ *  Created:	Jun 15, 2001
+ *  Copyright:	MontaVista Software Inc.
+ *
+ *  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.
+ */
+#include <linux/module.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/gpio/driver.h>
+#include <linux/gpio-pxa.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/irqdomain.h>
+#include <linux/irqchip/chained_irq.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/platform_device.h>
+#include <linux/syscore_ops.h>
+#include <linux/slab.h>
+
+/*
+ * We handle the GPIOs by banks, each bank covers up to 32 GPIOs with
+ * one set of registers. The register offsets are organized below:
+ *
+ *           GPLR    GPDR    GPSR    GPCR    GRER    GFER    GEDR
+ * BANK 0 - 0x0000  0x000C  0x0018  0x0024  0x0030  0x003C  0x0048
+ * BANK 1 - 0x0004  0x0010  0x001C  0x0028  0x0034  0x0040  0x004C
+ * BANK 2 - 0x0008  0x0014  0x0020  0x002C  0x0038  0x0044  0x0050
+ *
+ * BANK 3 - 0x0100  0x010C  0x0118  0x0124  0x0130  0x013C  0x0148
+ * BANK 4 - 0x0104  0x0110  0x011C  0x0128  0x0134  0x0140  0x014C
+ * BANK 5 - 0x0108  0x0114  0x0120  0x012C  0x0138  0x0144  0x0150
+ *
+ * BANK 6 - 0x0200  0x020C  0x0218  0x0224  0x0230  0x023C  0x0248
+ *
+ * NOTE:
+ *   BANK 3 is only available on PXA27x and later processors.
+ *   BANK 4 and 5 are only available on PXA935, PXA1928
+ *   BANK 6 is only available on PXA1928
+ */
+
+#define GPLR_OFFSET	0x00
+#define GPDR_OFFSET	0x0C
+#define GPSR_OFFSET	0x18
+#define GPCR_OFFSET	0x24
+#define GRER_OFFSET	0x30
+#define GFER_OFFSET	0x3C
+#define GEDR_OFFSET	0x48
+#define GAFR_OFFSET	0x54
+#define ED_MASK_OFFSET	0x9C	/* GPIO edge detection for AP side */
+
+#define BANK_OFF(n)	(((n) / 3) << 8) + (((n) % 3) << 2)
+
+int pxa_last_gpio;
+static int irq_base;
+
+struct pxa_gpio_bank {
+	void __iomem	*regbase;
+	unsigned long	irq_mask;
+	unsigned long	irq_edge_rise;
+	unsigned long	irq_edge_fall;
+
+#ifdef CONFIG_PM
+	unsigned long	saved_gplr;
+	unsigned long	saved_gpdr;
+	unsigned long	saved_grer;
+	unsigned long	saved_gfer;
+#endif
+};
+
+struct pxa_gpio_chip {
+	struct device *dev;
+	struct gpio_chip chip;
+	struct pxa_gpio_bank *banks;
+	struct irq_domain *irqdomain;
+
+	int irq0;
+	int irq1;
+	int (*set_wake)(unsigned int gpio, unsigned int on);
+};
+
+enum pxa_gpio_type {
+	PXA25X_GPIO = 0,
+	PXA26X_GPIO,
+	PXA27X_GPIO,
+	PXA3XX_GPIO,
+	PXA93X_GPIO,
+	MMP_GPIO = 0x10,
+	MMP2_GPIO,
+	PXA1928_GPIO,
+};
+
+struct pxa_gpio_id {
+	enum pxa_gpio_type	type;
+	int			gpio_nums;
+};
+
+static DEFINE_SPINLOCK(gpio_lock);
+static struct pxa_gpio_chip *pxa_gpio_chip;
+static enum pxa_gpio_type gpio_type;
+
+static struct pxa_gpio_id pxa25x_id = {
+	.type		= PXA25X_GPIO,
+	.gpio_nums	= 85,
+};
+
+static struct pxa_gpio_id pxa26x_id = {
+	.type		= PXA26X_GPIO,
+	.gpio_nums	= 90,
+};
+
+static struct pxa_gpio_id pxa27x_id = {
+	.type		= PXA27X_GPIO,
+	.gpio_nums	= 121,
+};
+
+static struct pxa_gpio_id pxa3xx_id = {
+	.type		= PXA3XX_GPIO,
+	.gpio_nums	= 128,
+};
+
+static struct pxa_gpio_id pxa93x_id = {
+	.type		= PXA93X_GPIO,
+	.gpio_nums	= 192,
+};
+
+static struct pxa_gpio_id mmp_id = {
+	.type		= MMP_GPIO,
+	.gpio_nums	= 128,
+};
+
+static struct pxa_gpio_id mmp2_id = {
+	.type		= MMP2_GPIO,
+	.gpio_nums	= 192,
+};
+
+static struct pxa_gpio_id pxa1928_id = {
+	.type		= PXA1928_GPIO,
+	.gpio_nums	= 224,
+};
+
+#define for_each_gpio_bank(i, b, pc)					\
+	for (i = 0, b = pc->banks; i <= pxa_last_gpio; i += 32, b++)
+
+static inline struct pxa_gpio_chip *chip_to_pxachip(struct gpio_chip *c)
+{
+	struct pxa_gpio_chip *pxa_chip = gpiochip_get_data(c);
+
+	return pxa_chip;
+}
+
+static inline void __iomem *gpio_bank_base(struct gpio_chip *c, int gpio)
+{
+	struct pxa_gpio_chip *p = gpiochip_get_data(c);
+	struct pxa_gpio_bank *bank = p->banks + (gpio / 32);
+
+	return bank->regbase;
+}
+
+static inline struct pxa_gpio_bank *gpio_to_pxabank(struct gpio_chip *c,
+						    unsigned gpio)
+{
+	return chip_to_pxachip(c)->banks + gpio / 32;
+}
+
+static inline int gpio_is_pxa_type(int type)
+{
+	return (type & MMP_GPIO) == 0;
+}
+
+static inline int gpio_is_mmp_type(int type)
+{
+	return (type & MMP_GPIO) != 0;
+}
+
+/* GPIO86/87/88/89 on PXA26x have their direction bits in PXA_GPDR(2 inverted,
+ * as well as their Alternate Function value being '1' for GPIO in GAFRx.
+ */
+static inline int __gpio_is_inverted(int gpio)
+{
+	if ((gpio_type == PXA26X_GPIO) && (gpio > 85))
+		return 1;
+	return 0;
+}
+
+/*
+ * On PXA25x and PXA27x, GAFRx and GPDRx together decide the alternate
+ * function of a GPIO, and GPDRx cannot be altered once configured. It
+ * is attributed as "occupied" here (I know this terminology isn't
+ * accurate, you are welcome to propose a better one :-)
+ */
+static inline int __gpio_is_occupied(struct pxa_gpio_chip *pchip, unsigned gpio)
+{
+	void __iomem *base;
+	unsigned long gafr = 0, gpdr = 0;
+	int ret, af = 0, dir = 0;
+
+	base = gpio_bank_base(&pchip->chip, gpio);
+	gpdr = readl_relaxed(base + GPDR_OFFSET);
+
+	switch (gpio_type) {
+	case PXA25X_GPIO:
+	case PXA26X_GPIO:
+	case PXA27X_GPIO:
+		gafr = readl_relaxed(base + GAFR_OFFSET);
+		af = (gafr >> ((gpio & 0xf) * 2)) & 0x3;
+		dir = gpdr & GPIO_bit(gpio);
+
+		if (__gpio_is_inverted(gpio))
+			ret = (af != 1) || (dir == 0);
+		else
+			ret = (af != 0) || (dir != 0);
+		break;
+	default:
+		ret = gpdr & GPIO_bit(gpio);
+		break;
+	}
+	return ret;
+}
+
+int pxa_irq_to_gpio(int irq)
+{
+	struct pxa_gpio_chip *pchip = pxa_gpio_chip;
+	int irq_gpio0;
+
+	irq_gpio0 = irq_find_mapping(pchip->irqdomain, 0);
+	if (irq_gpio0 > 0)
+		return irq - irq_gpio0;
+
+	return irq_gpio0;
+}
+
+static bool pxa_gpio_has_pinctrl(void)
+{
+	switch (gpio_type) {
+	case PXA3XX_GPIO:
+	case MMP2_GPIO:
+		return false;
+
+	default:
+		return true;
+	}
+}
+
+static int pxa_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
+{
+	struct pxa_gpio_chip *pchip = chip_to_pxachip(chip);
+
+	return irq_find_mapping(pchip->irqdomain, offset);
+}
+
+static int pxa_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
+{
+	void __iomem *base = gpio_bank_base(chip, offset);
+	uint32_t value, mask = GPIO_bit(offset);
+	unsigned long flags;
+	int ret;
+
+	if (pxa_gpio_has_pinctrl()) {
+		ret = pinctrl_gpio_direction_input(chip->base + offset);
+		if (ret)
+			return ret;
+	}
+
+	spin_lock_irqsave(&gpio_lock, flags);
+
+	value = readl_relaxed(base + GPDR_OFFSET);
+	if (__gpio_is_inverted(chip->base + offset))
+		value |= mask;
+	else
+		value &= ~mask;
+	writel_relaxed(value, base + GPDR_OFFSET);
+
+	spin_unlock_irqrestore(&gpio_lock, flags);
+	return 0;
+}
+
+static int pxa_gpio_direction_output(struct gpio_chip *chip,
+				     unsigned offset, int value)
+{
+	void __iomem *base = gpio_bank_base(chip, offset);
+	uint32_t tmp, mask = GPIO_bit(offset);
+	unsigned long flags;
+	int ret;
+
+	writel_relaxed(mask, base + (value ? GPSR_OFFSET : GPCR_OFFSET));
+
+	if (pxa_gpio_has_pinctrl()) {
+		ret = pinctrl_gpio_direction_output(chip->base + offset);
+		if (ret)
+			return ret;
+	}
+
+	spin_lock_irqsave(&gpio_lock, flags);
+
+	tmp = readl_relaxed(base + GPDR_OFFSET);
+	if (__gpio_is_inverted(chip->base + offset))
+		tmp &= ~mask;
+	else
+		tmp |= mask;
+	writel_relaxed(tmp, base + GPDR_OFFSET);
+
+	spin_unlock_irqrestore(&gpio_lock, flags);
+	return 0;
+}
+
+static int pxa_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+	void __iomem *base = gpio_bank_base(chip, offset);
+	u32 gplr = readl_relaxed(base + GPLR_OFFSET);
+
+	return !!(gplr & GPIO_bit(offset));
+}
+
+static void pxa_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
+{
+	void __iomem *base = gpio_bank_base(chip, offset);
+
+	writel_relaxed(GPIO_bit(offset),
+		       base + (value ? GPSR_OFFSET : GPCR_OFFSET));
+}
+
+#ifdef CONFIG_OF_GPIO
+static int pxa_gpio_of_xlate(struct gpio_chip *gc,
+			     const struct of_phandle_args *gpiospec,
+			     u32 *flags)
+{
+	if (gpiospec->args[0] > pxa_last_gpio)
+		return -EINVAL;
+
+	if (flags)
+		*flags = gpiospec->args[1];
+
+	return gpiospec->args[0];
+}
+#endif
+
+static int pxa_init_gpio_chip(struct pxa_gpio_chip *pchip, int ngpio,
+			      struct device_node *np, void __iomem *regbase)
+{
+	int i, gpio, nbanks = DIV_ROUND_UP(ngpio, 32);
+	struct pxa_gpio_bank *bank;
+
+	pchip->banks = devm_kcalloc(pchip->dev, nbanks, sizeof(*pchip->banks),
+				    GFP_KERNEL);
+	if (!pchip->banks)
+		return -ENOMEM;
+
+	pchip->chip.label = "gpio-pxa";
+	pchip->chip.direction_input  = pxa_gpio_direction_input;
+	pchip->chip.direction_output = pxa_gpio_direction_output;
+	pchip->chip.get = pxa_gpio_get;
+	pchip->chip.set = pxa_gpio_set;
+	pchip->chip.to_irq = pxa_gpio_to_irq;
+	pchip->chip.ngpio = ngpio;
+
+	if (pxa_gpio_has_pinctrl()) {
+		pchip->chip.request = gpiochip_generic_request;
+		pchip->chip.free = gpiochip_generic_free;
+	}
+
+#ifdef CONFIG_OF_GPIO
+	pchip->chip.of_node = np;
+	pchip->chip.of_xlate = pxa_gpio_of_xlate;
+	pchip->chip.of_gpio_n_cells = 2;
+#endif
+
+	for (i = 0, gpio = 0; i < nbanks; i++, gpio += 32) {
+		bank = pchip->banks + i;
+		bank->regbase = regbase + BANK_OFF(i);
+	}
+
+	return gpiochip_add_data(&pchip->chip, pchip);
+}
+
+/* Update only those GRERx and GFERx edge detection register bits if those
+ * bits are set in c->irq_mask
+ */
+static inline void update_edge_detect(struct pxa_gpio_bank *c)
+{
+	uint32_t grer, gfer;
+
+	grer = readl_relaxed(c->regbase + GRER_OFFSET) & ~c->irq_mask;
+	gfer = readl_relaxed(c->regbase + GFER_OFFSET) & ~c->irq_mask;
+	grer |= c->irq_edge_rise & c->irq_mask;
+	gfer |= c->irq_edge_fall & c->irq_mask;
+	writel_relaxed(grer, c->regbase + GRER_OFFSET);
+	writel_relaxed(gfer, c->regbase + GFER_OFFSET);
+}
+
+static int pxa_gpio_irq_type(struct irq_data *d, unsigned int type)
+{
+	struct pxa_gpio_chip *pchip = irq_data_get_irq_chip_data(d);
+	unsigned int gpio = irqd_to_hwirq(d);
+	struct pxa_gpio_bank *c = gpio_to_pxabank(&pchip->chip, gpio);
+	unsigned long gpdr, mask = GPIO_bit(gpio);
+
+	if (type == IRQ_TYPE_PROBE) {
+		/* Don't mess with enabled GPIOs using preconfigured edges or
+		 * GPIOs set to alternate function or to output during probe
+		 */
+		if ((c->irq_edge_rise | c->irq_edge_fall) & GPIO_bit(gpio))
+			return 0;
+
+		if (__gpio_is_occupied(pchip, gpio))
+			return 0;
+
+		type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
+	}
+
+	gpdr = readl_relaxed(c->regbase + GPDR_OFFSET);
+
+	if (__gpio_is_inverted(gpio))
+		writel_relaxed(gpdr | mask,  c->regbase + GPDR_OFFSET);
+	else
+		writel_relaxed(gpdr & ~mask, c->regbase + GPDR_OFFSET);
+
+	if (type & IRQ_TYPE_EDGE_RISING)
+		c->irq_edge_rise |= mask;
+	else
+		c->irq_edge_rise &= ~mask;
+
+	if (type & IRQ_TYPE_EDGE_FALLING)
+		c->irq_edge_fall |= mask;
+	else
+		c->irq_edge_fall &= ~mask;
+
+	update_edge_detect(c);
+
+	pr_debug("%s: IRQ%d (GPIO%d) - edge%s%s\n", __func__, d->irq, gpio,
+		((type & IRQ_TYPE_EDGE_RISING)  ? " rising"  : ""),
+		((type & IRQ_TYPE_EDGE_FALLING) ? " falling" : ""));
+	return 0;
+}
+
+static irqreturn_t pxa_gpio_demux_handler(int in_irq, void *d)
+{
+	int loop, gpio, n, handled = 0;
+	unsigned long gedr;
+	struct pxa_gpio_chip *pchip = d;
+	struct pxa_gpio_bank *c;
+
+	do {
+		loop = 0;
+		for_each_gpio_bank(gpio, c, pchip) {
+			gedr = readl_relaxed(c->regbase + GEDR_OFFSET);
+			gedr = gedr & c->irq_mask;
+			writel_relaxed(gedr, c->regbase + GEDR_OFFSET);
+
+			for_each_set_bit(n, &gedr, BITS_PER_LONG) {
+				loop = 1;
+
+				generic_handle_irq(
+					irq_find_mapping(pchip->irqdomain,
+							 gpio + n));
+			}
+		}
+		handled += loop;
+	} while (loop);
+
+	return handled ? IRQ_HANDLED : IRQ_NONE;
+}
+
+static irqreturn_t pxa_gpio_direct_handler(int in_irq, void *d)
+{
+	struct pxa_gpio_chip *pchip = d;
+
+	if (in_irq == pchip->irq0) {
+		generic_handle_irq(irq_find_mapping(pchip->irqdomain, 0));
+	} else if (in_irq == pchip->irq1) {
+		generic_handle_irq(irq_find_mapping(pchip->irqdomain, 1));
+	} else {
+		pr_err("%s() unknown irq %d\n", __func__, in_irq);
+		return IRQ_NONE;
+	}
+	return IRQ_HANDLED;
+}
+
+static void pxa_ack_muxed_gpio(struct irq_data *d)
+{
+	struct pxa_gpio_chip *pchip = irq_data_get_irq_chip_data(d);
+	unsigned int gpio = irqd_to_hwirq(d);
+	void __iomem *base = gpio_bank_base(&pchip->chip, gpio);
+
+	writel_relaxed(GPIO_bit(gpio), base + GEDR_OFFSET);
+}
+
+static void pxa_mask_muxed_gpio(struct irq_data *d)
+{
+	struct pxa_gpio_chip *pchip = irq_data_get_irq_chip_data(d);
+	unsigned int gpio = irqd_to_hwirq(d);
+	struct pxa_gpio_bank *b = gpio_to_pxabank(&pchip->chip, gpio);
+	void __iomem *base = gpio_bank_base(&pchip->chip, gpio);
+	uint32_t grer, gfer;
+
+	b->irq_mask &= ~GPIO_bit(gpio);
+
+	grer = readl_relaxed(base + GRER_OFFSET) & ~GPIO_bit(gpio);
+	gfer = readl_relaxed(base + GFER_OFFSET) & ~GPIO_bit(gpio);
+	writel_relaxed(grer, base + GRER_OFFSET);
+	writel_relaxed(gfer, base + GFER_OFFSET);
+}
+
+static int pxa_gpio_set_wake(struct irq_data *d, unsigned int on)
+{
+	struct pxa_gpio_chip *pchip = irq_data_get_irq_chip_data(d);
+	unsigned int gpio = irqd_to_hwirq(d);
+
+	if (pchip->set_wake)
+		return pchip->set_wake(gpio, on);
+	else
+		return 0;
+}
+
+static void pxa_unmask_muxed_gpio(struct irq_data *d)
+{
+	struct pxa_gpio_chip *pchip = irq_data_get_irq_chip_data(d);
+	unsigned int gpio = irqd_to_hwirq(d);
+	struct pxa_gpio_bank *c = gpio_to_pxabank(&pchip->chip, gpio);
+
+	c->irq_mask |= GPIO_bit(gpio);
+	update_edge_detect(c);
+}
+
+static struct irq_chip pxa_muxed_gpio_chip = {
+	.name		= "GPIO",
+	.irq_ack	= pxa_ack_muxed_gpio,
+	.irq_mask	= pxa_mask_muxed_gpio,
+	.irq_unmask	= pxa_unmask_muxed_gpio,
+	.irq_set_type	= pxa_gpio_irq_type,
+	.irq_set_wake	= pxa_gpio_set_wake,
+};
+
+static int pxa_gpio_nums(struct platform_device *pdev)
+{
+	const struct platform_device_id *id = platform_get_device_id(pdev);
+	struct pxa_gpio_id *pxa_id = (struct pxa_gpio_id *)id->driver_data;
+	int count = 0;
+
+	switch (pxa_id->type) {
+	case PXA25X_GPIO:
+	case PXA26X_GPIO:
+	case PXA27X_GPIO:
+	case PXA3XX_GPIO:
+	case PXA93X_GPIO:
+	case MMP_GPIO:
+	case MMP2_GPIO:
+	case PXA1928_GPIO:
+		gpio_type = pxa_id->type;
+		count = pxa_id->gpio_nums - 1;
+		break;
+	default:
+		count = -EINVAL;
+		break;
+	}
+	return count;
+}
+
+static int pxa_irq_domain_map(struct irq_domain *d, unsigned int irq,
+			      irq_hw_number_t hw)
+{
+	irq_set_chip_and_handler(irq, &pxa_muxed_gpio_chip,
+				 handle_edge_irq);
+	irq_set_chip_data(irq, d->host_data);
+	irq_set_noprobe(irq);
+	return 0;
+}
+
+const struct irq_domain_ops pxa_irq_domain_ops = {
+	.map	= pxa_irq_domain_map,
+	.xlate	= irq_domain_xlate_twocell,
+};
+
+#ifdef CONFIG_OF
+static const struct of_device_id pxa_gpio_dt_ids[] = {
+	{ .compatible = "intel,pxa25x-gpio",	.data = &pxa25x_id, },
+	{ .compatible = "intel,pxa26x-gpio",	.data = &pxa26x_id, },
+	{ .compatible = "intel,pxa27x-gpio",	.data = &pxa27x_id, },
+	{ .compatible = "intel,pxa3xx-gpio",	.data = &pxa3xx_id, },
+	{ .compatible = "marvell,pxa93x-gpio",	.data = &pxa93x_id, },
+	{ .compatible = "marvell,mmp-gpio",	.data = &mmp_id, },
+	{ .compatible = "marvell,mmp2-gpio",	.data = &mmp2_id, },
+	{ .compatible = "marvell,pxa1928-gpio",	.data = &pxa1928_id, },
+	{}
+};
+
+static int pxa_gpio_probe_dt(struct platform_device *pdev,
+			     struct pxa_gpio_chip *pchip)
+{
+	int nr_gpios;
+	const struct pxa_gpio_id *gpio_id;
+
+	gpio_id = of_device_get_match_data(&pdev->dev);
+	gpio_type = gpio_id->type;
+
+	nr_gpios = gpio_id->gpio_nums;
+	pxa_last_gpio = nr_gpios - 1;
+
+	irq_base = devm_irq_alloc_descs(&pdev->dev, -1, 0, nr_gpios, 0);
+	if (irq_base < 0) {
+		dev_err(&pdev->dev, "Failed to allocate IRQ numbers\n");
+		return irq_base;
+	}
+	return irq_base;
+}
+#else
+#define pxa_gpio_probe_dt(pdev, pchip)		(-1)
+#endif
+
+static int pxa_gpio_probe(struct platform_device *pdev)
+{
+	struct pxa_gpio_chip *pchip;
+	struct pxa_gpio_bank *c;
+	struct resource *res;
+	struct clk *clk;
+	struct pxa_gpio_platform_data *info;
+	void __iomem *gpio_reg_base;
+	int gpio, ret;
+	int irq0 = 0, irq1 = 0, irq_mux;
+
+	pchip = devm_kzalloc(&pdev->dev, sizeof(*pchip), GFP_KERNEL);
+	if (!pchip)
+		return -ENOMEM;
+	pchip->dev = &pdev->dev;
+
+	info = dev_get_platdata(&pdev->dev);
+	if (info) {
+		irq_base = info->irq_base;
+		if (irq_base <= 0)
+			return -EINVAL;
+		pxa_last_gpio = pxa_gpio_nums(pdev);
+		pchip->set_wake = info->gpio_set_wake;
+	} else {
+		irq_base = pxa_gpio_probe_dt(pdev, pchip);
+		if (irq_base < 0)
+			return -EINVAL;
+	}
+
+	if (!pxa_last_gpio)
+		return -EINVAL;
+
+	pchip->irqdomain = irq_domain_add_legacy(pdev->dev.of_node,
+						 pxa_last_gpio + 1, irq_base,
+						 0, &pxa_irq_domain_ops, pchip);
+	if (!pchip->irqdomain)
+		return -ENOMEM;
+
+	irq0 = platform_get_irq_byname(pdev, "gpio0");
+	irq1 = platform_get_irq_byname(pdev, "gpio1");
+	irq_mux = platform_get_irq_byname(pdev, "gpio_mux");
+	if ((irq0 > 0 && irq1 <= 0) || (irq0 <= 0 && irq1 > 0)
+		|| (irq_mux <= 0))
+		return -EINVAL;
+
+	pchip->irq0 = irq0;
+	pchip->irq1 = irq1;
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res)
+		return -EINVAL;
+	gpio_reg_base = devm_ioremap(&pdev->dev, res->start,
+				     resource_size(res));
+	if (!gpio_reg_base)
+		return -EINVAL;
+
+	clk = clk_get(&pdev->dev, NULL);
+	if (IS_ERR(clk)) {
+		dev_err(&pdev->dev, "Error %ld to get gpio clock\n",
+			PTR_ERR(clk));
+		return PTR_ERR(clk);
+	}
+	ret = clk_prepare_enable(clk);
+	if (ret) {
+		clk_put(clk);
+		return ret;
+	}
+
+	/* Initialize GPIO chips */
+	ret = pxa_init_gpio_chip(pchip, pxa_last_gpio + 1, pdev->dev.of_node,
+				 gpio_reg_base);
+	if (ret) {
+		clk_put(clk);
+		return ret;
+	}
+
+	/* clear all GPIO edge detects */
+	for_each_gpio_bank(gpio, c, pchip) {
+		writel_relaxed(0, c->regbase + GFER_OFFSET);
+		writel_relaxed(0, c->regbase + GRER_OFFSET);
+		writel_relaxed(~0, c->regbase + GEDR_OFFSET);
+		/* unmask GPIO edge detect for AP side */
+		if (gpio_is_mmp_type(gpio_type))
+			writel_relaxed(~0, c->regbase + ED_MASK_OFFSET);
+	}
+
+	if (irq0 > 0) {
+		ret = devm_request_irq(&pdev->dev,
+				       irq0, pxa_gpio_direct_handler, 0,
+				       "gpio-0", pchip);
+		if (ret)
+			dev_err(&pdev->dev, "request of gpio0 irq failed: %d\n",
+				ret);
+	}
+	if (irq1 > 0) {
+		ret = devm_request_irq(&pdev->dev,
+				       irq1, pxa_gpio_direct_handler, 0,
+				       "gpio-1", pchip);
+		if (ret)
+			dev_err(&pdev->dev, "request of gpio1 irq failed: %d\n",
+				ret);
+	}
+	ret = devm_request_irq(&pdev->dev,
+			       irq_mux, pxa_gpio_demux_handler, 0,
+				       "gpio-mux", pchip);
+	if (ret)
+		dev_err(&pdev->dev, "request of gpio-mux irq failed: %d\n",
+				ret);
+
+	pxa_gpio_chip = pchip;
+
+	return 0;
+}
+
+static const struct platform_device_id gpio_id_table[] = {
+	{ "pxa25x-gpio",	(unsigned long)&pxa25x_id },
+	{ "pxa26x-gpio",	(unsigned long)&pxa26x_id },
+	{ "pxa27x-gpio",	(unsigned long)&pxa27x_id },
+	{ "pxa3xx-gpio",	(unsigned long)&pxa3xx_id },
+	{ "pxa93x-gpio",	(unsigned long)&pxa93x_id },
+	{ "mmp-gpio",		(unsigned long)&mmp_id },
+	{ "mmp2-gpio",		(unsigned long)&mmp2_id },
+	{ "pxa1928-gpio",	(unsigned long)&pxa1928_id },
+	{ },
+};
+
+static struct platform_driver pxa_gpio_driver = {
+	.probe		= pxa_gpio_probe,
+	.driver		= {
+		.name	= "pxa-gpio",
+		.of_match_table = of_match_ptr(pxa_gpio_dt_ids),
+	},
+	.id_table	= gpio_id_table,
+};
+
+static int __init pxa_gpio_legacy_init(void)
+{
+	if (of_have_populated_dt())
+		return 0;
+
+	return platform_driver_register(&pxa_gpio_driver);
+}
+postcore_initcall(pxa_gpio_legacy_init);
+
+static int __init pxa_gpio_dt_init(void)
+{
+	if (of_have_populated_dt())
+		return platform_driver_register(&pxa_gpio_driver);
+
+	return 0;
+}
+device_initcall(pxa_gpio_dt_init);
+
+#ifdef CONFIG_PM
+static int pxa_gpio_suspend(void)
+{
+	struct pxa_gpio_chip *pchip = pxa_gpio_chip;
+	struct pxa_gpio_bank *c;
+	int gpio;
+
+	if (!pchip)
+		return 0;
+
+	for_each_gpio_bank(gpio, c, pchip) {
+		c->saved_gplr = readl_relaxed(c->regbase + GPLR_OFFSET);
+		c->saved_gpdr = readl_relaxed(c->regbase + GPDR_OFFSET);
+		c->saved_grer = readl_relaxed(c->regbase + GRER_OFFSET);
+		c->saved_gfer = readl_relaxed(c->regbase + GFER_OFFSET);
+
+		/* Clear GPIO transition detect bits */
+		writel_relaxed(0xffffffff, c->regbase + GEDR_OFFSET);
+	}
+	return 0;
+}
+
+static void pxa_gpio_resume(void)
+{
+	struct pxa_gpio_chip *pchip = pxa_gpio_chip;
+	struct pxa_gpio_bank *c;
+	int gpio;
+
+	if (!pchip)
+		return;
+
+	for_each_gpio_bank(gpio, c, pchip) {
+		/* restore level with set/clear */
+		writel_relaxed(c->saved_gplr, c->regbase + GPSR_OFFSET);
+		writel_relaxed(~c->saved_gplr, c->regbase + GPCR_OFFSET);
+
+		writel_relaxed(c->saved_grer, c->regbase + GRER_OFFSET);
+		writel_relaxed(c->saved_gfer, c->regbase + GFER_OFFSET);
+		writel_relaxed(c->saved_gpdr, c->regbase + GPDR_OFFSET);
+	}
+}
+#else
+#define pxa_gpio_suspend	NULL
+#define pxa_gpio_resume		NULL
+#endif
+
+struct syscore_ops pxa_gpio_syscore_ops = {
+	.suspend	= pxa_gpio_suspend,
+	.resume		= pxa_gpio_resume,
+};
+
+static int __init pxa_gpio_sysinit(void)
+{
+	register_syscore_ops(&pxa_gpio_syscore_ops);
+	return 0;
+}
+postcore_initcall(pxa_gpio_sysinit);