[mirror_ubuntu-bionic-kernel.git] / drivers / gpio / gpio-mpc8xxx.c

/*
 * GPIOs on MPC512x/8349/8572/8610/QorIQ and compatible
 *
 * Copyright (C) 2008 Peter Korsgaard <jacmet@sunsite.dk>
 * Copyright (C) 2016 Freescale Semiconductor Inc.
 *
 * 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.
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/slab.h>
#include <linux/irq.h>
#include <linux/gpio/driver.h>

#define MPC8XXX_GPIO_PINS	32

#define GPIO_DIR		0x00
#define GPIO_ODR		0x04
#define GPIO_DAT		0x08
#define GPIO_IER		0x0c
#define GPIO_IMR		0x10
#define GPIO_ICR		0x14
#define GPIO_ICR2		0x18

struct mpc8xxx_gpio_chip {
	struct gpio_chip	gc;
	void __iomem *regs;
	raw_spinlock_t lock;

	int (*direction_output)(struct gpio_chip *chip,
				unsigned offset, int value);

	struct irq_domain *irq;
	unsigned int irqn;
};

/* Workaround GPIO 1 errata on MPC8572/MPC8536. The status of GPIOs
 * defined as output cannot be determined by reading GPDAT register,
 * so we use shadow data register instead. The status of input pins
 * is determined by reading GPDAT register.
 */
static int mpc8572_gpio_get(struct gpio_chip *gc, unsigned int gpio)
{
	u32 val;
	struct mpc8xxx_gpio_chip *mpc8xxx_gc = gpiochip_get_data(gc);
	u32 out_mask, out_shadow;

	out_mask = gc->read_reg(mpc8xxx_gc->regs + GPIO_DIR);
	val = gc->read_reg(mpc8xxx_gc->regs + GPIO_DAT) & ~out_mask;
	out_shadow = gc->bgpio_data & out_mask;

	return !!((val | out_shadow) & gc->pin2mask(gc, gpio));
}

static int mpc5121_gpio_dir_out(struct gpio_chip *gc,
				unsigned int gpio, int val)
{
	struct mpc8xxx_gpio_chip *mpc8xxx_gc = gpiochip_get_data(gc);
	/* GPIO 28..31 are input only on MPC5121 */
	if (gpio >= 28)
		return -EINVAL;

	return mpc8xxx_gc->direction_output(gc, gpio, val);
}

static int mpc5125_gpio_dir_out(struct gpio_chip *gc,
				unsigned int gpio, int val)
{
	struct mpc8xxx_gpio_chip *mpc8xxx_gc = gpiochip_get_data(gc);
	/* GPIO 0..3 are input only on MPC5125 */
	if (gpio <= 3)
		return -EINVAL;

	return mpc8xxx_gc->direction_output(gc, gpio, val);
}

static int mpc8xxx_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
{
	struct mpc8xxx_gpio_chip *mpc8xxx_gc = gpiochip_get_data(gc);

	if (mpc8xxx_gc->irq && offset < MPC8XXX_GPIO_PINS)
		return irq_create_mapping(mpc8xxx_gc->irq, offset);
	else
		return -ENXIO;
}

static void mpc8xxx_gpio_irq_cascade(struct irq_desc *desc)
{
	struct mpc8xxx_gpio_chip *mpc8xxx_gc = irq_desc_get_handler_data(desc);
	struct irq_chip *chip = irq_desc_get_chip(desc);
	struct gpio_chip *gc = &mpc8xxx_gc->gc;
	unsigned int mask;

	mask = gc->read_reg(mpc8xxx_gc->regs + GPIO_IER)
		& gc->read_reg(mpc8xxx_gc->regs + GPIO_IMR);
	if (mask)
		generic_handle_irq(irq_linear_revmap(mpc8xxx_gc->irq,
						     32 - ffs(mask)));
	if (chip->irq_eoi)
		chip->irq_eoi(&desc->irq_data);
}

static void mpc8xxx_irq_unmask(struct irq_data *d)
{
	struct mpc8xxx_gpio_chip *mpc8xxx_gc = irq_data_get_irq_chip_data(d);
	struct gpio_chip *gc = &mpc8xxx_gc->gc;
	unsigned long flags;

	raw_spin_lock_irqsave(&mpc8xxx_gc->lock, flags);

	gc->write_reg(mpc8xxx_gc->regs + GPIO_IMR,
		gc->read_reg(mpc8xxx_gc->regs + GPIO_IMR)
		| gc->pin2mask(gc, irqd_to_hwirq(d)));

	raw_spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
}

static void mpc8xxx_irq_mask(struct irq_data *d)
{
	struct mpc8xxx_gpio_chip *mpc8xxx_gc = irq_data_get_irq_chip_data(d);
	struct gpio_chip *gc = &mpc8xxx_gc->gc;
	unsigned long flags;

	raw_spin_lock_irqsave(&mpc8xxx_gc->lock, flags);

	gc->write_reg(mpc8xxx_gc->regs + GPIO_IMR,
		gc->read_reg(mpc8xxx_gc->regs + GPIO_IMR)
		& ~(gc->pin2mask(gc, irqd_to_hwirq(d))));

	raw_spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
}

static void mpc8xxx_irq_ack(struct irq_data *d)
{
	struct mpc8xxx_gpio_chip *mpc8xxx_gc = irq_data_get_irq_chip_data(d);
	struct gpio_chip *gc = &mpc8xxx_gc->gc;

	gc->write_reg(mpc8xxx_gc->regs + GPIO_IER,
		      gc->pin2mask(gc, irqd_to_hwirq(d)));
}

static int mpc8xxx_irq_set_type(struct irq_data *d, unsigned int flow_type)
{
	struct mpc8xxx_gpio_chip *mpc8xxx_gc = irq_data_get_irq_chip_data(d);
	struct gpio_chip *gc = &mpc8xxx_gc->gc;
	unsigned long flags;

	switch (flow_type) {
	case IRQ_TYPE_EDGE_FALLING:
		raw_spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
		gc->write_reg(mpc8xxx_gc->regs + GPIO_ICR,
			gc->read_reg(mpc8xxx_gc->regs + GPIO_ICR)
			| gc->pin2mask(gc, irqd_to_hwirq(d)));
		raw_spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
		break;

	case IRQ_TYPE_EDGE_BOTH:
		raw_spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
		gc->write_reg(mpc8xxx_gc->regs + GPIO_ICR,
			gc->read_reg(mpc8xxx_gc->regs + GPIO_ICR)
			& ~(gc->pin2mask(gc, irqd_to_hwirq(d))));
		raw_spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
		break;

	default:
		return -EINVAL;
	}

	return 0;
}

static int mpc512x_irq_set_type(struct irq_data *d, unsigned int flow_type)
{
	struct mpc8xxx_gpio_chip *mpc8xxx_gc = irq_data_get_irq_chip_data(d);
	struct gpio_chip *gc = &mpc8xxx_gc->gc;
	unsigned long gpio = irqd_to_hwirq(d);
	void __iomem *reg;
	unsigned int shift;
	unsigned long flags;

	if (gpio < 16) {
		reg = mpc8xxx_gc->regs + GPIO_ICR;
		shift = (15 - gpio) * 2;
	} else {
		reg = mpc8xxx_gc->regs + GPIO_ICR2;
		shift = (15 - (gpio % 16)) * 2;
	}

	switch (flow_type) {
	case IRQ_TYPE_EDGE_FALLING:
	case IRQ_TYPE_LEVEL_LOW:
		raw_spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
		gc->write_reg(reg, (gc->read_reg(reg) & ~(3 << shift))
			| (2 << shift));
		raw_spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
		break;

	case IRQ_TYPE_EDGE_RISING:
	case IRQ_TYPE_LEVEL_HIGH:
		raw_spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
		gc->write_reg(reg, (gc->read_reg(reg) & ~(3 << shift))
			| (1 << shift));
		raw_spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
		break;

	case IRQ_TYPE_EDGE_BOTH:
		raw_spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
		gc->write_reg(reg, (gc->read_reg(reg) & ~(3 << shift)));
		raw_spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
		break;

	default:
		return -EINVAL;
	}

	return 0;
}

static struct irq_chip mpc8xxx_irq_chip = {
	.name		= "mpc8xxx-gpio",
	.irq_unmask	= mpc8xxx_irq_unmask,
	.irq_mask	= mpc8xxx_irq_mask,
	.irq_ack	= mpc8xxx_irq_ack,
	/* this might get overwritten in mpc8xxx_probe() */
	.irq_set_type	= mpc8xxx_irq_set_type,
};

static int mpc8xxx_gpio_irq_map(struct irq_domain *h, unsigned int irq,
				irq_hw_number_t hwirq)
{
	irq_set_chip_data(irq, h->host_data);
	irq_set_chip_and_handler(irq, &mpc8xxx_irq_chip, handle_edge_irq);

	return 0;
}

static const struct irq_domain_ops mpc8xxx_gpio_irq_ops = {
	.map	= mpc8xxx_gpio_irq_map,
	.xlate	= irq_domain_xlate_twocell,
};

struct mpc8xxx_gpio_devtype {
	int (*gpio_dir_out)(struct gpio_chip *, unsigned int, int);
	int (*gpio_get)(struct gpio_chip *, unsigned int);
	int (*irq_set_type)(struct irq_data *, unsigned int);
};

static const struct mpc8xxx_gpio_devtype mpc512x_gpio_devtype = {
	.gpio_dir_out = mpc5121_gpio_dir_out,
	.irq_set_type = mpc512x_irq_set_type,
};

static const struct mpc8xxx_gpio_devtype mpc5125_gpio_devtype = {
	.gpio_dir_out = mpc5125_gpio_dir_out,
	.irq_set_type = mpc512x_irq_set_type,
};

static const struct mpc8xxx_gpio_devtype mpc8572_gpio_devtype = {
	.gpio_get = mpc8572_gpio_get,
};

static const struct mpc8xxx_gpio_devtype mpc8xxx_gpio_devtype_default = {
	.irq_set_type = mpc8xxx_irq_set_type,
};

static const struct of_device_id mpc8xxx_gpio_ids[] = {
	{ .compatible = "fsl,mpc8349-gpio", },
	{ .compatible = "fsl,mpc8572-gpio", .data = &mpc8572_gpio_devtype, },
	{ .compatible = "fsl,mpc8610-gpio", },
	{ .compatible = "fsl,mpc5121-gpio", .data = &mpc512x_gpio_devtype, },
	{ .compatible = "fsl,mpc5125-gpio", .data = &mpc5125_gpio_devtype, },
	{ .compatible = "fsl,pq3-gpio",     },
	{ .compatible = "fsl,qoriq-gpio",   },
	{}
};

static int mpc8xxx_probe(struct platform_device *pdev)
{
	struct device_node *np = pdev->dev.of_node;
	struct mpc8xxx_gpio_chip *mpc8xxx_gc;
	struct gpio_chip	*gc;
	const struct mpc8xxx_gpio_devtype *devtype =
		of_device_get_match_data(&pdev->dev);
	int ret;

	mpc8xxx_gc = devm_kzalloc(&pdev->dev, sizeof(*mpc8xxx_gc), GFP_KERNEL);
	if (!mpc8xxx_gc)
		return -ENOMEM;

	platform_set_drvdata(pdev, mpc8xxx_gc);

	raw_spin_lock_init(&mpc8xxx_gc->lock);

	mpc8xxx_gc->regs = of_iomap(np, 0);
	if (!mpc8xxx_gc->regs)
		return -ENOMEM;

	gc = &mpc8xxx_gc->gc;

	if (of_property_read_bool(np, "little-endian")) {
		ret = bgpio_init(gc, &pdev->dev, 4,
				 mpc8xxx_gc->regs + GPIO_DAT,
				 NULL, NULL,
				 mpc8xxx_gc->regs + GPIO_DIR, NULL,
				 BGPIOF_BIG_ENDIAN);
		if (ret)
			goto err;
		dev_dbg(&pdev->dev, "GPIO registers are LITTLE endian\n");
	} else {
		ret = bgpio_init(gc, &pdev->dev, 4,
				 mpc8xxx_gc->regs + GPIO_DAT,
				 NULL, NULL,
				 mpc8xxx_gc->regs + GPIO_DIR, NULL,
				 BGPIOF_BIG_ENDIAN
				 | BGPIOF_BIG_ENDIAN_BYTE_ORDER);
		if (ret)
			goto err;
		dev_dbg(&pdev->dev, "GPIO registers are BIG endian\n");
	}

	mpc8xxx_gc->direction_output = gc->direction_output;

	if (!devtype)
		devtype = &mpc8xxx_gpio_devtype_default;

	/*
	 * It's assumed that only a single type of gpio controller is available
	 * on the current machine, so overwriting global data is fine.
	 */
	mpc8xxx_irq_chip.irq_set_type = devtype->irq_set_type;

	if (devtype->gpio_dir_out)
		gc->direction_output = devtype->gpio_dir_out;
	if (devtype->gpio_get)
		gc->get = devtype->gpio_get;

	gc->to_irq = mpc8xxx_gpio_to_irq;

	ret = gpiochip_add_data(gc, mpc8xxx_gc);
	if (ret) {
		pr_err("%s: GPIO chip registration failed with status %d\n",
		       np->full_name, ret);
		goto err;
	}

	mpc8xxx_gc->irqn = irq_of_parse_and_map(np, 0);
	if (!mpc8xxx_gc->irqn)
		return 0;

	mpc8xxx_gc->irq = irq_domain_add_linear(np, MPC8XXX_GPIO_PINS,
					&mpc8xxx_gpio_irq_ops, mpc8xxx_gc);
	if (!mpc8xxx_gc->irq)
		return 0;

	/* ack and mask all irqs */
	gc->write_reg(mpc8xxx_gc->regs + GPIO_IER, 0xffffffff);
	gc->write_reg(mpc8xxx_gc->regs + GPIO_IMR, 0);

	irq_set_chained_handler_and_data(mpc8xxx_gc->irqn,
					 mpc8xxx_gpio_irq_cascade, mpc8xxx_gc);
	return 0;
err:
	iounmap(mpc8xxx_gc->regs);
	return ret;
}

static int mpc8xxx_remove(struct platform_device *pdev)
{
	struct mpc8xxx_gpio_chip *mpc8xxx_gc = platform_get_drvdata(pdev);

	if (mpc8xxx_gc->irq) {
		irq_set_chained_handler_and_data(mpc8xxx_gc->irqn, NULL, NULL);
		irq_domain_remove(mpc8xxx_gc->irq);
	}

	gpiochip_remove(&mpc8xxx_gc->gc);
	iounmap(mpc8xxx_gc->regs);

	return 0;
}

static struct platform_driver mpc8xxx_plat_driver = {
	.probe		= mpc8xxx_probe,
	.remove		= mpc8xxx_remove,
	.driver		= {
		.name = "gpio-mpc8xxx",
		.of_match_table	= mpc8xxx_gpio_ids,
	},
};

static int __init mpc8xxx_init(void)
{
	return platform_driver_register(&mpc8xxx_plat_driver);
}

arch_initcall(mpc8xxx_init);
Commit	Line	Data
1e16dfc1	1	/*
42178e2a	2	* GPIOs on MPC512x/8349/8572/8610/QorIQ and compatible
1e16dfc1 PK	3	*
1e16dfc1 PK	4	* Copyright (C) 2008 Peter Korsgaard <jacmet@sunsite.dk>
42178e2a	5	* Copyright (C) 2016 Freescale Semiconductor Inc.
1e16dfc1 PK	6	*
	7	* This file is licensed under the terms of the GNU General Public License
	8	* version 2. This program is licensed "as is" without any warranty of any
	9	* kind, whether express or implied.
	10	*/
	11
	12	#include <linux/kernel.h>
	13	#include <linux/init.h>
	14	#include <linux/spinlock.h>
	15	#include <linux/io.h>
	16	#include <linux/of.h>
	17	#include <linux/of_gpio.h>
42178e2a	18	#include <linux/of_address.h>
5af50730	19	#include <linux/of_irq.h>
98686d9a	20	#include <linux/of_platform.h>
5a0e3ad6	21	#include <linux/slab.h>
345e5c8a	22	#include <linux/irq.h>
42178e2a	23	#include <linux/gpio/driver.h>
1e16dfc1 PK	24
	25	#define MPC8XXX_GPIO_PINS 32
	26
	27	#define GPIO_DIR 0x00
	28	#define GPIO_ODR 0x04
	29	#define GPIO_DAT 0x08
	30	#define GPIO_IER 0x0c
	31	#define GPIO_IMR 0x10
	32	#define GPIO_ICR 0x14
e39d5ef6	33	#define GPIO_ICR2 0x18
1e16dfc1 PK	34
1e16dfc1 PK	35	struct mpc8xxx_gpio_chip {
42178e2a LG	36	struct gpio_chip gc;
42178e2a LG	37	void __iomem *regs;
50593613	38	raw_spinlock_t lock;
1e16dfc1	39
42178e2a LG	40	int (direction_output)(struct gpio_chip chip,
	41	unsigned offset, int value);
	42
bae1d8f1	43	struct irq_domain *irq;
257e1075	44	unsigned int irqn;
1e16dfc1 PK	45	};
1e16dfc1 PK	46
c1a676df FR	47	/* Workaround GPIO 1 errata on MPC8572/MPC8536. The status of GPIOs
	48	* defined as output cannot be determined by reading GPDAT register,
	49	* so we use shadow data register instead. The status of input pins
	50	* is determined by reading GPDAT register.
	51	*/
	52	static int mpc8572_gpio_get(struct gpio_chip *gc, unsigned int gpio)
	53	{
	54	u32 val;
709d71a1	55	struct mpc8xxx_gpio_chip *mpc8xxx_gc = gpiochip_get_data(gc);
1aeef303	56	u32 out_mask, out_shadow;
c1a676df	57
cd0d3f58 AL	58	out_mask = gc->read_reg(mpc8xxx_gc->regs + GPIO_DIR);
cd0d3f58 AL	59	val = gc->read_reg(mpc8xxx_gc->regs + GPIO_DAT) & ~out_mask;
42178e2a	60	out_shadow = gc->bgpio_data & out_mask;
1aeef303	61
42178e2a	62	return !!((val \| out_shadow) & gc->pin2mask(gc, gpio));
c1a676df FR	63	}
c1a676df FR	64
42178e2a LG	65	static int mpc5121_gpio_dir_out(struct gpio_chip *gc,
42178e2a LG	66	unsigned int gpio, int val)
1e16dfc1	67	{
709d71a1	68	struct mpc8xxx_gpio_chip *mpc8xxx_gc = gpiochip_get_data(gc);
28538df0 WS	69	/* GPIO 28..31 are input only on MPC5121 */
	70	if (gpio >= 28)
	71	return -EINVAL;
	72
42178e2a	73	return mpc8xxx_gc->direction_output(gc, gpio, val);
28538df0 WS	74	}
28538df0 WS	75
42178e2a LG	76	static int mpc5125_gpio_dir_out(struct gpio_chip *gc,
42178e2a LG	77	unsigned int gpio, int val)
0ba69e08	78	{
42178e2a	79	struct mpc8xxx_gpio_chip *mpc8xxx_gc = gpiochip_get_data(gc);
0ba69e08 UKK	80	/* GPIO 0..3 are input only on MPC5125 */
	81	if (gpio <= 3)
	82	return -EINVAL;
	83
42178e2a	84	return mpc8xxx_gc->direction_output(gc, gpio, val);
0ba69e08 UKK	85	}
0ba69e08 UKK	86
345e5c8a PK	87	static int mpc8xxx_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
345e5c8a PK	88	{
709d71a1	89	struct mpc8xxx_gpio_chip *mpc8xxx_gc = gpiochip_get_data(gc);
345e5c8a PK	90
	91	if (mpc8xxx_gc->irq && offset < MPC8XXX_GPIO_PINS)
	92	return irq_create_mapping(mpc8xxx_gc->irq, offset);
	93	else
	94	return -ENXIO;
	95	}
	96
bd0b9ac4	97	static void mpc8xxx_gpio_irq_cascade(struct irq_desc *desc)
345e5c8a	98	{
ec775d0e	99	struct mpc8xxx_gpio_chip *mpc8xxx_gc = irq_desc_get_handler_data(desc);
cfadd838	100	struct irq_chip *chip = irq_desc_get_chip(desc);
cd0d3f58	101	struct gpio_chip *gc = &mpc8xxx_gc->gc;
345e5c8a PK	102	unsigned int mask;
345e5c8a PK	103
cd0d3f58 AL	104	mask = gc->read_reg(mpc8xxx_gc->regs + GPIO_IER)
cd0d3f58 AL	105	& gc->read_reg(mpc8xxx_gc->regs + GPIO_IMR);
345e5c8a PK	106	if (mask)
	107	generic_handle_irq(irq_linear_revmap(mpc8xxx_gc->irq,
	108	32 - ffs(mask)));
d6de85e8 TG	109	if (chip->irq_eoi)
d6de85e8 TG	110	chip->irq_eoi(&desc->irq_data);
345e5c8a PK	111	}
345e5c8a PK	112
94347cb3	113	static void mpc8xxx_irq_unmask(struct irq_data *d)
345e5c8a	114	{
94347cb3	115	struct mpc8xxx_gpio_chip *mpc8xxx_gc = irq_data_get_irq_chip_data(d);
42178e2a	116	struct gpio_chip *gc = &mpc8xxx_gc->gc;
345e5c8a PK	117	unsigned long flags;
345e5c8a PK	118
50593613	119	raw_spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
345e5c8a	120
cd0d3f58 AL	121	gc->write_reg(mpc8xxx_gc->regs + GPIO_IMR,
cd0d3f58 AL	122	gc->read_reg(mpc8xxx_gc->regs + GPIO_IMR)
42178e2a	123	\| gc->pin2mask(gc, irqd_to_hwirq(d)));
345e5c8a	124
50593613	125	raw_spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
345e5c8a PK	126	}
345e5c8a PK	127
94347cb3	128	static void mpc8xxx_irq_mask(struct irq_data *d)
345e5c8a	129	{
94347cb3	130	struct mpc8xxx_gpio_chip *mpc8xxx_gc = irq_data_get_irq_chip_data(d);
42178e2a	131	struct gpio_chip *gc = &mpc8xxx_gc->gc;
345e5c8a PK	132	unsigned long flags;
345e5c8a PK	133
50593613	134	raw_spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
345e5c8a	135
cd0d3f58 AL	136	gc->write_reg(mpc8xxx_gc->regs + GPIO_IMR,
cd0d3f58 AL	137	gc->read_reg(mpc8xxx_gc->regs + GPIO_IMR)
42178e2a	138	& ~(gc->pin2mask(gc, irqd_to_hwirq(d))));
345e5c8a	139
50593613	140	raw_spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
345e5c8a PK	141	}
345e5c8a PK	142
94347cb3	143	static void mpc8xxx_irq_ack(struct irq_data *d)
345e5c8a	144	{
94347cb3	145	struct mpc8xxx_gpio_chip *mpc8xxx_gc = irq_data_get_irq_chip_data(d);
42178e2a	146	struct gpio_chip *gc = &mpc8xxx_gc->gc;
345e5c8a	147
cd0d3f58 AL	148	gc->write_reg(mpc8xxx_gc->regs + GPIO_IER,
cd0d3f58 AL	149	gc->pin2mask(gc, irqd_to_hwirq(d)));
345e5c8a PK	150	}
345e5c8a PK	151
94347cb3	152	static int mpc8xxx_irq_set_type(struct irq_data *d, unsigned int flow_type)
345e5c8a	153	{
94347cb3	154	struct mpc8xxx_gpio_chip *mpc8xxx_gc = irq_data_get_irq_chip_data(d);
42178e2a	155	struct gpio_chip *gc = &mpc8xxx_gc->gc;
345e5c8a PK	156	unsigned long flags;
	157
	158	switch (flow_type) {
	159	case IRQ_TYPE_EDGE_FALLING:
50593613	160	raw_spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
cd0d3f58 AL	161	gc->write_reg(mpc8xxx_gc->regs + GPIO_ICR,
cd0d3f58 AL	162	gc->read_reg(mpc8xxx_gc->regs + GPIO_ICR)
42178e2a	163	\| gc->pin2mask(gc, irqd_to_hwirq(d)));
50593613	164	raw_spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
345e5c8a PK	165	break;
	166
	167	case IRQ_TYPE_EDGE_BOTH:
50593613	168	raw_spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
cd0d3f58 AL	169	gc->write_reg(mpc8xxx_gc->regs + GPIO_ICR,
cd0d3f58 AL	170	gc->read_reg(mpc8xxx_gc->regs + GPIO_ICR)
42178e2a	171	& ~(gc->pin2mask(gc, irqd_to_hwirq(d))));
50593613	172	raw_spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
345e5c8a PK	173	break;
	174
	175	default:
	176	return -EINVAL;
	177	}
	178
	179	return 0;
	180	}
	181
94347cb3	182	static int mpc512x_irq_set_type(struct irq_data *d, unsigned int flow_type)
e39d5ef6	183	{
94347cb3	184	struct mpc8xxx_gpio_chip *mpc8xxx_gc = irq_data_get_irq_chip_data(d);
cd0d3f58	185	struct gpio_chip *gc = &mpc8xxx_gc->gc;
476eb491	186	unsigned long gpio = irqd_to_hwirq(d);
e39d5ef6 AG	187	void __iomem *reg;
	188	unsigned int shift;
	189	unsigned long flags;
	190
	191	if (gpio < 16) {
42178e2a	192	reg = mpc8xxx_gc->regs + GPIO_ICR;
e39d5ef6 AG	193	shift = (15 - gpio) * 2;
e39d5ef6 AG	194	} else {
42178e2a	195	reg = mpc8xxx_gc->regs + GPIO_ICR2;
e39d5ef6 AG	196	shift = (15 - (gpio % 16)) * 2;
	197	}
	198
	199	switch (flow_type) {
	200	case IRQ_TYPE_EDGE_FALLING:
	201	case IRQ_TYPE_LEVEL_LOW:
50593613	202	raw_spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
cd0d3f58	203	gc->write_reg(reg, (gc->read_reg(reg) & ~(3 << shift))
42178e2a	204	\| (2 << shift));
50593613	205	raw_spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
e39d5ef6 AG	206	break;
	207
	208	case IRQ_TYPE_EDGE_RISING:
	209	case IRQ_TYPE_LEVEL_HIGH:
50593613	210	raw_spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
cd0d3f58	211	gc->write_reg(reg, (gc->read_reg(reg) & ~(3 << shift))
42178e2a	212	\| (1 << shift));
50593613	213	raw_spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
e39d5ef6 AG	214	break;
	215
	216	case IRQ_TYPE_EDGE_BOTH:
50593613	217	raw_spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
cd0d3f58	218	gc->write_reg(reg, (gc->read_reg(reg) & ~(3 << shift)));
50593613	219	raw_spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
e39d5ef6 AG	220	break;
	221
	222	default:
	223	return -EINVAL;
	224	}
	225
	226	return 0;
	227	}
	228
345e5c8a PK	229	static struct irq_chip mpc8xxx_irq_chip = {
345e5c8a PK	230	.name = "mpc8xxx-gpio",
94347cb3 LB	231	.irq_unmask = mpc8xxx_irq_unmask,
	232	.irq_mask = mpc8xxx_irq_mask,
	233	.irq_ack = mpc8xxx_irq_ack,
82e39b0d	234	/* this might get overwritten in mpc8xxx_probe() */
94347cb3	235	.irq_set_type = mpc8xxx_irq_set_type,
345e5c8a PK	236	};
345e5c8a PK	237
5ba17ae9 LW	238	static int mpc8xxx_gpio_irq_map(struct irq_domain *h, unsigned int irq,
5ba17ae9 LW	239	irq_hw_number_t hwirq)
345e5c8a	240	{
5ba17ae9	241	irq_set_chip_data(irq, h->host_data);
d71cf15b	242	irq_set_chip_and_handler(irq, &mpc8xxx_irq_chip, handle_edge_irq);
345e5c8a PK	243
	244	return 0;
	245	}
	246
0b354dc4	247	static const struct irq_domain_ops mpc8xxx_gpio_irq_ops = {
345e5c8a	248	.map = mpc8xxx_gpio_irq_map,
ff8c3ab8	249	.xlate = irq_domain_xlate_twocell,
345e5c8a PK	250	};
345e5c8a PK	251
82e39b0d UKK	252	struct mpc8xxx_gpio_devtype {
	253	int (gpio_dir_out)(struct gpio_chip , unsigned int, int);
	254	int (gpio_get)(struct gpio_chip , unsigned int);
	255	int (irq_set_type)(struct irq_data , unsigned int);
	256	};
	257
	258	static const struct mpc8xxx_gpio_devtype mpc512x_gpio_devtype = {
	259	.gpio_dir_out = mpc5121_gpio_dir_out,
	260	.irq_set_type = mpc512x_irq_set_type,
	261	};
	262
0ba69e08 UKK	263	static const struct mpc8xxx_gpio_devtype mpc5125_gpio_devtype = {
	264	.gpio_dir_out = mpc5125_gpio_dir_out,
	265	.irq_set_type = mpc512x_irq_set_type,
	266	};
	267
82e39b0d UKK	268	static const struct mpc8xxx_gpio_devtype mpc8572_gpio_devtype = {
	269	.gpio_get = mpc8572_gpio_get,
	270	};
	271
	272	static const struct mpc8xxx_gpio_devtype mpc8xxx_gpio_devtype_default = {
82e39b0d UKK	273	.irq_set_type = mpc8xxx_irq_set_type,
	274	};
	275
4183afef	276	static const struct of_device_id mpc8xxx_gpio_ids[] = {
e39d5ef6	277	{ .compatible = "fsl,mpc8349-gpio", },
82e39b0d	278	{ .compatible = "fsl,mpc8572-gpio", .data = &mpc8572_gpio_devtype, },
e39d5ef6	279	{ .compatible = "fsl,mpc8610-gpio", },
82e39b0d	280	{ .compatible = "fsl,mpc5121-gpio", .data = &mpc512x_gpio_devtype, },
0ba69e08	281	{ .compatible = "fsl,mpc5125-gpio", .data = &mpc5125_gpio_devtype, },
15a5148c	282	{ .compatible = "fsl,pq3-gpio", },
d1dcfbbb	283	{ .compatible = "fsl,qoriq-gpio", },
e39d5ef6 AG	284	{}
	285	};
	286
98686d9a	287	static int mpc8xxx_probe(struct platform_device *pdev)
1e16dfc1	288	{
98686d9a	289	struct device_node *np = pdev->dev.of_node;
1e16dfc1	290	struct mpc8xxx_gpio_chip *mpc8xxx_gc;
42178e2a	291	struct gpio_chip *gc;
82e39b0d UKK	292	const struct mpc8xxx_gpio_devtype *devtype =
82e39b0d UKK	293	of_device_get_match_data(&pdev->dev);
1e16dfc1 PK	294	int ret;
1e16dfc1 PK	295
98686d9a RRD	296	mpc8xxx_gc = devm_kzalloc(&pdev->dev, sizeof(*mpc8xxx_gc), GFP_KERNEL);
	297	if (!mpc8xxx_gc)
	298	return -ENOMEM;
1e16dfc1	299
257e1075 RRD	300	platform_set_drvdata(pdev, mpc8xxx_gc);
257e1075 RRD	301
50593613	302	raw_spin_lock_init(&mpc8xxx_gc->lock);
1e16dfc1	303
42178e2a LG	304	mpc8xxx_gc->regs = of_iomap(np, 0);
	305	if (!mpc8xxx_gc->regs)
	306	return -ENOMEM;
	307
	308	gc = &mpc8xxx_gc->gc;
	309
	310	if (of_property_read_bool(np, "little-endian")) {
	311	ret = bgpio_init(gc, &pdev->dev, 4,
	312	mpc8xxx_gc->regs + GPIO_DAT,
	313	NULL, NULL,
	314	mpc8xxx_gc->regs + GPIO_DIR, NULL,
	315	BGPIOF_BIG_ENDIAN);
	316	if (ret)
	317	goto err;
	318	dev_dbg(&pdev->dev, "GPIO registers are LITTLE endian\n");
	319	} else {
	320	ret = bgpio_init(gc, &pdev->dev, 4,
	321	mpc8xxx_gc->regs + GPIO_DAT,
	322	NULL, NULL,
	323	mpc8xxx_gc->regs + GPIO_DIR, NULL,
	324	BGPIOF_BIG_ENDIAN
	325	\| BGPIOF_BIG_ENDIAN_BYTE_ORDER);
	326	if (ret)
	327	goto err;
	328	dev_dbg(&pdev->dev, "GPIO registers are BIG endian\n");
	329	}
1e16dfc1	330
fa4007ca	331	mpc8xxx_gc->direction_output = gc->direction_output;
82e39b0d UKK	332
	333	if (!devtype)
	334	devtype = &mpc8xxx_gpio_devtype_default;
	335
	336	/*
	337	* It's assumed that only a single type of gpio controller is available
	338	* on the current machine, so overwriting global data is fine.
	339	*/
	340	mpc8xxx_irq_chip.irq_set_type = devtype->irq_set_type;
	341
adf32eaa AL	342	if (devtype->gpio_dir_out)
	343	gc->direction_output = devtype->gpio_dir_out;
	344	if (devtype->gpio_get)
	345	gc->get = devtype->gpio_get;
	346
345e5c8a	347	gc->to_irq = mpc8xxx_gpio_to_irq;
1e16dfc1	348
42178e2a LG	349	ret = gpiochip_add_data(gc, mpc8xxx_gc);
	350	if (ret) {
	351	pr_err("%s: GPIO chip registration failed with status %d\n",
	352	np->full_name, ret);
	353	goto err;
	354	}
1e16dfc1	355
257e1075	356	mpc8xxx_gc->irqn = irq_of_parse_and_map(np, 0);
42178e2a	357	if (!mpc8xxx_gc->irqn)
98686d9a	358	return 0;
345e5c8a	359
a8db8cf0 GL	360	mpc8xxx_gc->irq = irq_domain_add_linear(np, MPC8XXX_GPIO_PINS,
a8db8cf0 GL	361	&mpc8xxx_gpio_irq_ops, mpc8xxx_gc);
345e5c8a	362	if (!mpc8xxx_gc->irq)
98686d9a	363	return 0;
345e5c8a	364
345e5c8a	365	/* ack and mask all irqs */
cd0d3f58 AL	366	gc->write_reg(mpc8xxx_gc->regs + GPIO_IER, 0xffffffff);
cd0d3f58 AL	367	gc->write_reg(mpc8xxx_gc->regs + GPIO_IMR, 0);
345e5c8a	368
05379818 TG	369	irq_set_chained_handler_and_data(mpc8xxx_gc->irqn,
05379818 TG	370	mpc8xxx_gpio_irq_cascade, mpc8xxx_gc);
257e1075	371	return 0;
42178e2a LG	372	err:
	373	iounmap(mpc8xxx_gc->regs);
	374	return ret;
257e1075 RRD	375	}
	376
	377	static int mpc8xxx_remove(struct platform_device *pdev)
	378	{
	379	struct mpc8xxx_gpio_chip *mpc8xxx_gc = platform_get_drvdata(pdev);
	380
	381	if (mpc8xxx_gc->irq) {
05379818	382	irq_set_chained_handler_and_data(mpc8xxx_gc->irqn, NULL, NULL);
257e1075 RRD	383	irq_domain_remove(mpc8xxx_gc->irq);
	384	}
	385
42178e2a LG	386	gpiochip_remove(&mpc8xxx_gc->gc);
42178e2a LG	387	iounmap(mpc8xxx_gc->regs);
345e5c8a	388
98686d9a	389	return 0;
1e16dfc1 PK	390	}
1e16dfc1 PK	391
98686d9a RRD	392	static struct platform_driver mpc8xxx_plat_driver = {
98686d9a RRD	393	.probe = mpc8xxx_probe,
257e1075	394	.remove = mpc8xxx_remove,
98686d9a RRD	395	.driver = {
	396	.name = "gpio-mpc8xxx",
	397	.of_match_table = mpc8xxx_gpio_ids,
	398	},
	399	};
1e16dfc1	400
98686d9a RRD	401	static int __init mpc8xxx_init(void)
	402	{
	403	return platform_driver_register(&mpc8xxx_plat_driver);
1e16dfc1	404	}
98686d9a RRD	405
98686d9a RRD	406	arch_initcall(mpc8xxx_init);