[linux.git] / drivers / gpio / gpio-xilinx.c

/*
 * Xilinx gpio driver for xps/axi_gpio IP.
 *
 * Copyright 2008 - 2013 Xilinx, 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <linux/bitops.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/of_platform.h>
#include <linux/of_gpio.h>
#include <linux/io.h>
#include <linux/gpio/driver.h>
#include <linux/slab.h>

/* Register Offset Definitions */
#define XGPIO_DATA_OFFSET   (0x0)	/* Data register  */
#define XGPIO_TRI_OFFSET    (0x4)	/* I/O direction register  */

#define XGPIO_CHANNEL_OFFSET	0x8

/* Read/Write access to the GPIO registers */
#if defined(CONFIG_ARCH_ZYNQ) || defined(CONFIG_X86)
# define xgpio_readreg(offset)		readl(offset)
# define xgpio_writereg(offset, val)	writel(val, offset)
#else
# define xgpio_readreg(offset)		__raw_readl(offset)
# define xgpio_writereg(offset, val)	__raw_writel(val, offset)
#endif

/**
 * struct xgpio_instance - Stores information about GPIO device
 * @mmchip: OF GPIO chip for memory mapped banks
 * @gpio_width: GPIO width for every channel
 * @gpio_state: GPIO state shadow register
 * @gpio_dir: GPIO direction shadow register
 * @gpio_lock: Lock used for synchronization
 */
struct xgpio_instance {
	struct of_mm_gpio_chip mmchip;
	unsigned int gpio_width[2];
	u32 gpio_state[2];
	u32 gpio_dir[2];
	spinlock_t gpio_lock[2];
};

static inline int xgpio_index(struct xgpio_instance *chip, int gpio)
{
	if (gpio >= chip->gpio_width[0])
		return 1;

	return 0;
}

static inline int xgpio_regoffset(struct xgpio_instance *chip, int gpio)
{
	if (xgpio_index(chip, gpio))
		return XGPIO_CHANNEL_OFFSET;

	return 0;
}

static inline int xgpio_offset(struct xgpio_instance *chip, int gpio)
{
	if (xgpio_index(chip, gpio))
		return gpio - chip->gpio_width[0];

	return gpio;
}

/**
 * xgpio_get - Read the specified signal of the GPIO device.
 * @gc:     Pointer to gpio_chip device structure.
 * @gpio:   GPIO signal number.
 *
 * This function reads the specified signal of the GPIO device.
 *
 * Return:
 * 0 if direction of GPIO signals is set as input otherwise it
 * returns negative error value.
 */
static int xgpio_get(struct gpio_chip *gc, unsigned int gpio)
{
	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
	struct xgpio_instance *chip = gpiochip_get_data(gc);
	u32 val;

	val = xgpio_readreg(mm_gc->regs + XGPIO_DATA_OFFSET +
			    xgpio_regoffset(chip, gpio));

	return !!(val & BIT(xgpio_offset(chip, gpio)));
}

/**
 * xgpio_set - Write the specified signal of the GPIO device.
 * @gc:     Pointer to gpio_chip device structure.
 * @gpio:   GPIO signal number.
 * @val:    Value to be written to specified signal.
 *
 * This function writes the specified value in to the specified signal of the
 * GPIO device.
 */
static void xgpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
{
	unsigned long flags;
	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
	struct xgpio_instance *chip = gpiochip_get_data(gc);
	int index =  xgpio_index(chip, gpio);
	int offset =  xgpio_offset(chip, gpio);

	spin_lock_irqsave(&chip->gpio_lock[index], flags);

	/* Write to GPIO signal and set its direction to output */
	if (val)
		chip->gpio_state[index] |= BIT(offset);
	else
		chip->gpio_state[index] &= ~BIT(offset);

	xgpio_writereg(mm_gc->regs + XGPIO_DATA_OFFSET +
		       xgpio_regoffset(chip, gpio), chip->gpio_state[index]);

	spin_unlock_irqrestore(&chip->gpio_lock[index], flags);
}

/**
 * xgpio_set_multiple - Write the specified signals of the GPIO device.
 * @gc:     Pointer to gpio_chip device structure.
 * @mask:   Mask of the GPIOS to modify.
 * @bits:   Value to be wrote on each GPIO
 *
 * This function writes the specified values into the specified signals of the
 * GPIO devices.
 */
static void xgpio_set_multiple(struct gpio_chip *gc, unsigned long *mask,
			       unsigned long *bits)
{
	unsigned long flags;
	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
	struct xgpio_instance *chip = gpiochip_get_data(gc);
	int index = xgpio_index(chip, 0);
	int offset, i;

	spin_lock_irqsave(&chip->gpio_lock[index], flags);

	/* Write to GPIO signals */
	for (i = 0; i < gc->ngpio; i++) {
		if (*mask == 0)
			break;
		if (index !=  xgpio_index(chip, i)) {
			xgpio_writereg(mm_gc->regs + XGPIO_DATA_OFFSET +
				       xgpio_regoffset(chip, i),
				       chip->gpio_state[index]);
			spin_unlock_irqrestore(&chip->gpio_lock[index], flags);
			index =  xgpio_index(chip, i);
			spin_lock_irqsave(&chip->gpio_lock[index], flags);
		}
		if (__test_and_clear_bit(i, mask)) {
			offset =  xgpio_offset(chip, i);
			if (test_bit(i, bits))
				chip->gpio_state[index] |= BIT(offset);
			else
				chip->gpio_state[index] &= ~BIT(offset);
		}
	}

	xgpio_writereg(mm_gc->regs + XGPIO_DATA_OFFSET +
		       xgpio_regoffset(chip, i), chip->gpio_state[index]);

	spin_unlock_irqrestore(&chip->gpio_lock[index], flags);
}

/**
 * xgpio_dir_in - Set the direction of the specified GPIO signal as input.
 * @gc:     Pointer to gpio_chip device structure.
 * @gpio:   GPIO signal number.
 *
 * Return:
 * 0 - if direction of GPIO signals is set as input
 * otherwise it returns negative error value.
 */
static int xgpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
{
	unsigned long flags;
	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
	struct xgpio_instance *chip = gpiochip_get_data(gc);
	int index =  xgpio_index(chip, gpio);
	int offset =  xgpio_offset(chip, gpio);

	spin_lock_irqsave(&chip->gpio_lock[index], flags);

	/* Set the GPIO bit in shadow register and set direction as input */
	chip->gpio_dir[index] |= BIT(offset);
	xgpio_writereg(mm_gc->regs + XGPIO_TRI_OFFSET +
		       xgpio_regoffset(chip, gpio), chip->gpio_dir[index]);

	spin_unlock_irqrestore(&chip->gpio_lock[index], flags);

	return 0;
}

/**
 * xgpio_dir_out - Set the direction of the specified GPIO signal as output.
 * @gc:     Pointer to gpio_chip device structure.
 * @gpio:   GPIO signal number.
 * @val:    Value to be written to specified signal.
 *
 * This function sets the direction of specified GPIO signal as output.
 *
 * Return:
 * If all GPIO signals of GPIO chip is configured as input then it returns
 * error otherwise it returns 0.
 */
static int xgpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
{
	unsigned long flags;
	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
	struct xgpio_instance *chip = gpiochip_get_data(gc);
	int index =  xgpio_index(chip, gpio);
	int offset =  xgpio_offset(chip, gpio);

	spin_lock_irqsave(&chip->gpio_lock[index], flags);

	/* Write state of GPIO signal */
	if (val)
		chip->gpio_state[index] |= BIT(offset);
	else
		chip->gpio_state[index] &= ~BIT(offset);
	xgpio_writereg(mm_gc->regs + XGPIO_DATA_OFFSET +
			xgpio_regoffset(chip, gpio), chip->gpio_state[index]);

	/* Clear the GPIO bit in shadow register and set direction as output */
	chip->gpio_dir[index] &= ~BIT(offset);
	xgpio_writereg(mm_gc->regs + XGPIO_TRI_OFFSET +
			xgpio_regoffset(chip, gpio), chip->gpio_dir[index]);

	spin_unlock_irqrestore(&chip->gpio_lock[index], flags);

	return 0;
}

/**
 * xgpio_save_regs - Set initial values of GPIO pins
 * @mm_gc: Pointer to memory mapped GPIO chip structure
 */
static void xgpio_save_regs(struct of_mm_gpio_chip *mm_gc)
{
	struct xgpio_instance *chip =
		container_of(mm_gc, struct xgpio_instance, mmchip);

	xgpio_writereg(mm_gc->regs + XGPIO_DATA_OFFSET,	chip->gpio_state[0]);
	xgpio_writereg(mm_gc->regs + XGPIO_TRI_OFFSET, chip->gpio_dir[0]);

	if (!chip->gpio_width[1])
		return;

	xgpio_writereg(mm_gc->regs + XGPIO_DATA_OFFSET + XGPIO_CHANNEL_OFFSET,
		       chip->gpio_state[1]);
	xgpio_writereg(mm_gc->regs + XGPIO_TRI_OFFSET + XGPIO_CHANNEL_OFFSET,
		       chip->gpio_dir[1]);
}

/**
 * xgpio_remove - Remove method for the GPIO device.
 * @pdev: pointer to the platform device
 *
 * This function remove gpiochips and frees all the allocated resources.
 *
 * Return: 0 always
 */
static int xgpio_remove(struct platform_device *pdev)
{
	struct xgpio_instance *chip = platform_get_drvdata(pdev);

	of_mm_gpiochip_remove(&chip->mmchip);

	return 0;
}

/**
 * xgpio_of_probe - Probe method for the GPIO device.
 * @pdev: pointer to the platform device
 *
 * Return:
 * It returns 0, if the driver is bound to the GPIO device, or
 * a negative value if there is an error.
 */
static int xgpio_probe(struct platform_device *pdev)
{
	struct xgpio_instance *chip;
	int status = 0;
	struct device_node *np = pdev->dev.of_node;
	u32 is_dual;

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

	platform_set_drvdata(pdev, chip);

	/* Update GPIO state shadow register with default value */
	of_property_read_u32(np, "xlnx,dout-default", &chip->gpio_state[0]);

	/* Update GPIO direction shadow register with default value */
	if (of_property_read_u32(np, "xlnx,tri-default", &chip->gpio_dir[0]))
		chip->gpio_dir[0] = 0xFFFFFFFF;

	/*
	 * Check device node and parent device node for device width
	 * and assume default width of 32
	 */
	if (of_property_read_u32(np, "xlnx,gpio-width", &chip->gpio_width[0]))
		chip->gpio_width[0] = 32;

	spin_lock_init(&chip->gpio_lock[0]);

	if (of_property_read_u32(np, "xlnx,is-dual", &is_dual))
		is_dual = 0;

	if (is_dual) {
		/* Update GPIO state shadow register with default value */
		of_property_read_u32(np, "xlnx,dout-default-2",
				     &chip->gpio_state[1]);

		/* Update GPIO direction shadow register with default value */
		if (of_property_read_u32(np, "xlnx,tri-default-2",
					 &chip->gpio_dir[1]))
			chip->gpio_dir[1] = 0xFFFFFFFF;

		/*
		 * Check device node and parent device node for device width
		 * and assume default width of 32
		 */
		if (of_property_read_u32(np, "xlnx,gpio2-width",
					 &chip->gpio_width[1]))
			chip->gpio_width[1] = 32;

		spin_lock_init(&chip->gpio_lock[1]);
	}

	chip->mmchip.gc.ngpio = chip->gpio_width[0] + chip->gpio_width[1];
	chip->mmchip.gc.parent = &pdev->dev;
	chip->mmchip.gc.direction_input = xgpio_dir_in;
	chip->mmchip.gc.direction_output = xgpio_dir_out;
	chip->mmchip.gc.get = xgpio_get;
	chip->mmchip.gc.set = xgpio_set;
	chip->mmchip.gc.set_multiple = xgpio_set_multiple;

	chip->mmchip.save_regs = xgpio_save_regs;

	/* Call the OF gpio helper to setup and register the GPIO device */
	status = of_mm_gpiochip_add_data(np, &chip->mmchip, chip);
	if (status) {
		pr_err("%pOF: error in probe function with status %d\n",
		       np, status);
		return status;
	}

	return 0;
}

static const struct of_device_id xgpio_of_match[] = {
	{ .compatible = "xlnx,xps-gpio-1.00.a", },
	{ /* end of list */ },
};

MODULE_DEVICE_TABLE(of, xgpio_of_match);

static struct platform_driver xgpio_plat_driver = {
	.probe		= xgpio_probe,
	.remove		= xgpio_remove,
	.driver		= {
			.name = "gpio-xilinx",
			.of_match_table	= xgpio_of_match,
	},
};

static int __init xgpio_init(void)
{
	return platform_driver_register(&xgpio_plat_driver);
}

subsys_initcall(xgpio_init);

static void __exit xgpio_exit(void)
{
	platform_driver_unregister(&xgpio_plat_driver);
}
module_exit(xgpio_exit);

MODULE_AUTHOR("Xilinx, Inc.");
MODULE_DESCRIPTION("Xilinx GPIO driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
0bcb6069	1	/*
74600ee0	2	* Xilinx gpio driver for xps/axi_gpio IP.
0bcb6069	3	*
74600ee0	4	* Copyright 2008 - 2013 Xilinx, Inc.
0bcb6069 JL	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2
	8	* as published by the Free Software Foundation.
	9	*
	10	* You should have received a copy of the GNU General Public License
	11	* along with this program; if not, write to the Free Software
	12	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	13	*/
	14
74600ee0	15	#include <linux/bitops.h>
0bcb6069 JL	16	#include <linux/init.h>
0bcb6069 JL	17	#include <linux/errno.h>
bb207ef1	18	#include <linux/module.h>
0bcb6069 JL	19	#include <linux/of_device.h>
	20	#include <linux/of_platform.h>
	21	#include <linux/of_gpio.h>
	22	#include <linux/io.h>
516df4eb	23	#include <linux/gpio/driver.h>
5a0e3ad6	24	#include <linux/slab.h>
0bcb6069 JL	25
	26	/* Register Offset Definitions */
	27	#define XGPIO_DATA_OFFSET (0x0) /* Data register */
	28	#define XGPIO_TRI_OFFSET (0x4) /* I/O direction register */
	29
74600ee0 MS	30	#define XGPIO_CHANNEL_OFFSET 0x8
	31
	32	/* Read/Write access to the GPIO registers */
c54c58ba	33	#if defined(CONFIG_ARCH_ZYNQ) \|\| defined(CONFIG_X86)
cc090d61 MS	34	# define xgpio_readreg(offset) readl(offset)
	35	# define xgpio_writereg(offset, val) writel(val, offset)
	36	#else
	37	# define xgpio_readreg(offset) __raw_readl(offset)
	38	# define xgpio_writereg(offset, val) __raw_writel(val, offset)
	39	#endif
74600ee0 MS	40
	41	/**
	42	* struct xgpio_instance - Stores information about GPIO device
4ae798fa	43	* @mmchip: OF GPIO chip for memory mapped banks
3c1b5c9b	44	* @gpio_width: GPIO width for every channel
4ae798fa RR	45	* @gpio_state: GPIO state shadow register
	46	* @gpio_dir: GPIO direction shadow register
	47	* @gpio_lock: Lock used for synchronization
74600ee0	48	*/
0bcb6069 JL	49	struct xgpio_instance {
0bcb6069 JL	50	struct of_mm_gpio_chip mmchip;
1d6902d3 RR	51	unsigned int gpio_width[2];
	52	u32 gpio_state[2];
	53	u32 gpio_dir[2];
	54	spinlock_t gpio_lock[2];
749564ff RR	55	};
749564ff RR	56
1d6902d3 RR	57	static inline int xgpio_index(struct xgpio_instance *chip, int gpio)
	58	{
	59	if (gpio >= chip->gpio_width[0])
	60	return 1;
	61
	62	return 0;
	63	}
	64
	65	static inline int xgpio_regoffset(struct xgpio_instance *chip, int gpio)
	66	{
	67	if (xgpio_index(chip, gpio))
	68	return XGPIO_CHANNEL_OFFSET;
	69
	70	return 0;
	71	}
	72
	73	static inline int xgpio_offset(struct xgpio_instance *chip, int gpio)
	74	{
	75	if (xgpio_index(chip, gpio))
	76	return gpio - chip->gpio_width[0];
	77
	78	return gpio;
	79	}
0bcb6069 JL	80
	81	/**
	82	* xgpio_get - Read the specified signal of the GPIO device.
	83	* @gc: Pointer to gpio_chip device structure.
	84	* @gpio: GPIO signal number.
	85	*
4ae798fa RR	86	* This function reads the specified signal of the GPIO device.
	87	*
	88	* Return:
	89	* 0 if direction of GPIO signals is set as input otherwise it
	90	* returns negative error value.
0bcb6069 JL	91	*/
	92	static int xgpio_get(struct gpio_chip *gc, unsigned int gpio)
	93	{
	94	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
097d88e9	95	struct xgpio_instance *chip = gpiochip_get_data(gc);
1d6902d3	96	u32 val;
0bcb6069	97
1d6902d3 RR	98	val = xgpio_readreg(mm_gc->regs + XGPIO_DATA_OFFSET +
	99	xgpio_regoffset(chip, gpio));
	100
	101	return !!(val & BIT(xgpio_offset(chip, gpio)));
0bcb6069 JL	102	}
	103
	104	/**
	105	* xgpio_set - Write the specified signal of the GPIO device.
	106	* @gc: Pointer to gpio_chip device structure.
	107	* @gpio: GPIO signal number.
	108	* @val: Value to be written to specified signal.
	109	*
	110	* This function writes the specified value in to the specified signal of the
	111	* GPIO device.
	112	*/
	113	static void xgpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
	114	{
	115	unsigned long flags;
	116	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
097d88e9	117	struct xgpio_instance *chip = gpiochip_get_data(gc);
1d6902d3 RR	118	int index = xgpio_index(chip, gpio);
1d6902d3 RR	119	int offset = xgpio_offset(chip, gpio);
0bcb6069	120
1d6902d3	121	spin_lock_irqsave(&chip->gpio_lock[index], flags);
0bcb6069 JL	122
	123	/* Write to GPIO signal and set its direction to output */
	124	if (val)
1d6902d3	125	chip->gpio_state[index] \|= BIT(offset);
0bcb6069	126	else
1d6902d3	127	chip->gpio_state[index] &= ~BIT(offset);
74600ee0	128
1d6902d3 RR	129	xgpio_writereg(mm_gc->regs + XGPIO_DATA_OFFSET +
1d6902d3 RR	130	xgpio_regoffset(chip, gpio), chip->gpio_state[index]);
0bcb6069	131
1d6902d3	132	spin_unlock_irqrestore(&chip->gpio_lock[index], flags);
0bcb6069 JL	133	}
0bcb6069 JL	134
8e7c1b80 IR	135	/**
	136	* xgpio_set_multiple - Write the specified signals of the GPIO device.
	137	* @gc: Pointer to gpio_chip device structure.
	138	* @mask: Mask of the GPIOS to modify.
	139	* @bits: Value to be wrote on each GPIO
	140	*
	141	* This function writes the specified values into the specified signals of the
	142	* GPIO devices.
	143	*/
	144	static void xgpio_set_multiple(struct gpio_chip gc, unsigned long mask,
	145	unsigned long *bits)
	146	{
	147	unsigned long flags;
	148	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
	149	struct xgpio_instance *chip = gpiochip_get_data(gc);
	150	int index = xgpio_index(chip, 0);
	151	int offset, i;
	152
	153	spin_lock_irqsave(&chip->gpio_lock[index], flags);
	154
	155	/* Write to GPIO signals */
	156	for (i = 0; i < gc->ngpio; i++) {
	157	if (*mask == 0)
	158	break;
	159	if (index != xgpio_index(chip, i)) {
	160	xgpio_writereg(mm_gc->regs + XGPIO_DATA_OFFSET +
	161	xgpio_regoffset(chip, i),
	162	chip->gpio_state[index]);
	163	spin_unlock_irqrestore(&chip->gpio_lock[index], flags);
	164	index = xgpio_index(chip, i);
	165	spin_lock_irqsave(&chip->gpio_lock[index], flags);
	166	}
	167	if (__test_and_clear_bit(i, mask)) {
	168	offset = xgpio_offset(chip, i);
	169	if (test_bit(i, bits))
	170	chip->gpio_state[index] \|= BIT(offset);
	171	else
	172	chip->gpio_state[index] &= ~BIT(offset);
	173	}
	174	}
	175
	176	xgpio_writereg(mm_gc->regs + XGPIO_DATA_OFFSET +
	177	xgpio_regoffset(chip, i), chip->gpio_state[index]);
	178
	179	spin_unlock_irqrestore(&chip->gpio_lock[index], flags);
	180	}
	181
0bcb6069 JL	182	/**
	183	* xgpio_dir_in - Set the direction of the specified GPIO signal as input.
	184	* @gc: Pointer to gpio_chip device structure.
	185	* @gpio: GPIO signal number.
	186	*
4ae798fa RR	187	* Return:
	188	* 0 - if direction of GPIO signals is set as input
	189	* otherwise it returns negative error value.
0bcb6069 JL	190	*/
	191	static int xgpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
	192	{
	193	unsigned long flags;
	194	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
097d88e9	195	struct xgpio_instance *chip = gpiochip_get_data(gc);
1d6902d3 RR	196	int index = xgpio_index(chip, gpio);
1d6902d3 RR	197	int offset = xgpio_offset(chip, gpio);
0bcb6069	198
1d6902d3	199	spin_lock_irqsave(&chip->gpio_lock[index], flags);
0bcb6069 JL	200
0bcb6069 JL	201	/* Set the GPIO bit in shadow register and set direction as input */
1d6902d3 RR	202	chip->gpio_dir[index] \|= BIT(offset);
	203	xgpio_writereg(mm_gc->regs + XGPIO_TRI_OFFSET +
	204	xgpio_regoffset(chip, gpio), chip->gpio_dir[index]);
0bcb6069	205
1d6902d3	206	spin_unlock_irqrestore(&chip->gpio_lock[index], flags);
0bcb6069 JL	207
	208	return 0;
	209	}
	210
	211	/**
	212	* xgpio_dir_out - Set the direction of the specified GPIO signal as output.
	213	* @gc: Pointer to gpio_chip device structure.
	214	* @gpio: GPIO signal number.
	215	* @val: Value to be written to specified signal.
	216	*
4ae798fa RR	217	* This function sets the direction of specified GPIO signal as output.
	218	*
	219	* Return:
	220	* If all GPIO signals of GPIO chip is configured as input then it returns
0bcb6069 JL	221	* error otherwise it returns 0.
	222	*/
	223	static int xgpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
	224	{
	225	unsigned long flags;
	226	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
097d88e9	227	struct xgpio_instance *chip = gpiochip_get_data(gc);
1d6902d3 RR	228	int index = xgpio_index(chip, gpio);
1d6902d3 RR	229	int offset = xgpio_offset(chip, gpio);
0bcb6069	230
1d6902d3	231	spin_lock_irqsave(&chip->gpio_lock[index], flags);
0bcb6069 JL	232
	233	/* Write state of GPIO signal */
	234	if (val)
1d6902d3	235	chip->gpio_state[index] \|= BIT(offset);
0bcb6069	236	else
1d6902d3 RR	237	chip->gpio_state[index] &= ~BIT(offset);
	238	xgpio_writereg(mm_gc->regs + XGPIO_DATA_OFFSET +
	239	xgpio_regoffset(chip, gpio), chip->gpio_state[index]);
0bcb6069 JL	240
0bcb6069 JL	241	/* Clear the GPIO bit in shadow register and set direction as output */
1d6902d3 RR	242	chip->gpio_dir[index] &= ~BIT(offset);
	243	xgpio_writereg(mm_gc->regs + XGPIO_TRI_OFFSET +
	244	xgpio_regoffset(chip, gpio), chip->gpio_dir[index]);
0bcb6069	245
1d6902d3	246	spin_unlock_irqrestore(&chip->gpio_lock[index], flags);
0bcb6069 JL	247
	248	return 0;
	249	}
	250
	251	/**
	252	* xgpio_save_regs - Set initial values of GPIO pins
4ae798fa	253	* @mm_gc: Pointer to memory mapped GPIO chip structure
0bcb6069 JL	254	*/
	255	static void xgpio_save_regs(struct of_mm_gpio_chip *mm_gc)
	256	{
de06c1db GR	257	struct xgpio_instance *chip =
de06c1db GR	258	container_of(mm_gc, struct xgpio_instance, mmchip);
0bcb6069	259
1d6902d3 RR	260	xgpio_writereg(mm_gc->regs + XGPIO_DATA_OFFSET, chip->gpio_state[0]);
	261	xgpio_writereg(mm_gc->regs + XGPIO_TRI_OFFSET, chip->gpio_dir[0]);
	262
	263	if (!chip->gpio_width[1])
	264	return;
	265
5b2c9121	266	xgpio_writereg(mm_gc->regs + XGPIO_DATA_OFFSET + XGPIO_CHANNEL_OFFSET,
1d6902d3	267	chip->gpio_state[1]);
5b2c9121	268	xgpio_writereg(mm_gc->regs + XGPIO_TRI_OFFSET + XGPIO_CHANNEL_OFFSET,
1d6902d3	269	chip->gpio_dir[1]);
0bcb6069 JL	270	}
0bcb6069 JL	271
749564ff RR	272	/**
	273	* xgpio_remove - Remove method for the GPIO device.
	274	* @pdev: pointer to the platform device
	275	*
	276	* This function remove gpiochips and frees all the allocated resources.
3c1b5c9b MS	277	*
3c1b5c9b MS	278	* Return: 0 always
749564ff RR	279	*/
	280	static int xgpio_remove(struct platform_device *pdev)
	281	{
1d6902d3	282	struct xgpio_instance *chip = platform_get_drvdata(pdev);
749564ff	283
c458e450	284	of_mm_gpiochip_remove(&chip->mmchip);
749564ff RR	285
	286	return 0;
	287	}
	288
0bcb6069 JL	289	/**
0bcb6069 JL	290	* xgpio_of_probe - Probe method for the GPIO device.
749564ff	291	* @pdev: pointer to the platform device
0bcb6069	292	*
4ae798fa RR	293	* Return:
	294	* It returns 0, if the driver is bound to the GPIO device, or
	295	* a negative value if there is an error.
0bcb6069	296	*/
749564ff	297	static int xgpio_probe(struct platform_device *pdev)
0bcb6069 JL	298	{
0bcb6069 JL	299	struct xgpio_instance *chip;
0bcb6069	300	int status = 0;
749564ff	301	struct device_node *np = pdev->dev.of_node;
1d6902d3	302	u32 is_dual;
0bcb6069	303
1d6902d3 RR	304	chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL);
1d6902d3 RR	305	if (!chip)
0bcb6069	306	return -ENOMEM;
0bcb6069	307
1d6902d3	308	platform_set_drvdata(pdev, chip);
749564ff	309
0bcb6069	310	/* Update GPIO state shadow register with default value */
1d6902d3	311	of_property_read_u32(np, "xlnx,dout-default", &chip->gpio_state[0]);
0bcb6069 JL	312
0bcb6069 JL	313	/* Update GPIO direction shadow register with default value */
1d6902d3 RR	314	if (of_property_read_u32(np, "xlnx,tri-default", &chip->gpio_dir[0]))
1d6902d3 RR	315	chip->gpio_dir[0] = 0xFFFFFFFF;
6f8bf500	316
1b4c5a6e GV	317	/*
	318	* Check device node and parent device node for device width
	319	* and assume default width of 32
	320	*/
1d6902d3 RR	321	if (of_property_read_u32(np, "xlnx,gpio-width", &chip->gpio_width[0]))
	322	chip->gpio_width[0] = 32;
	323
	324	spin_lock_init(&chip->gpio_lock[0]);
	325
	326	if (of_property_read_u32(np, "xlnx,is-dual", &is_dual))
	327	is_dual = 0;
0bcb6069	328
1d6902d3 RR	329	if (is_dual) {
	330	/* Update GPIO state shadow register with default value */
	331	of_property_read_u32(np, "xlnx,dout-default-2",
	332	&chip->gpio_state[1]);
	333
	334	/* Update GPIO direction shadow register with default value */
	335	if (of_property_read_u32(np, "xlnx,tri-default-2",
	336	&chip->gpio_dir[1]))
	337	chip->gpio_dir[1] = 0xFFFFFFFF;
0bcb6069	338
1d6902d3 RR	339	/*
	340	* Check device node and parent device node for device width
	341	* and assume default width of 32
	342	*/
	343	if (of_property_read_u32(np, "xlnx,gpio2-width",
	344	&chip->gpio_width[1]))
	345	chip->gpio_width[1] = 32;
	346
	347	spin_lock_init(&chip->gpio_lock[1]);
	348	}
	349
	350	chip->mmchip.gc.ngpio = chip->gpio_width[0] + chip->gpio_width[1];
58383c78	351	chip->mmchip.gc.parent = &pdev->dev;
a19e3da5 AV	352	chip->mmchip.gc.direction_input = xgpio_dir_in;
	353	chip->mmchip.gc.direction_output = xgpio_dir_out;
	354	chip->mmchip.gc.get = xgpio_get;
	355	chip->mmchip.gc.set = xgpio_set;
8e7c1b80	356	chip->mmchip.gc.set_multiple = xgpio_set_multiple;
0bcb6069 JL	357
	358	chip->mmchip.save_regs = xgpio_save_regs;
	359
	360	/* Call the OF gpio helper to setup and register the GPIO device */
097d88e9	361	status = of_mm_gpiochip_add_data(np, &chip->mmchip, chip);
0bcb6069	362	if (status) {
7eb6ce2f RH	363	pr_err("%pOF: error in probe function with status %d\n",
7eb6ce2f RH	364	np, status);
0bcb6069 JL	365	return status;
0bcb6069 JL	366	}
74600ee0	367
0bcb6069 JL	368	return 0;
	369	}
	370
9992bc95	371	static const struct of_device_id xgpio_of_match[] = {
0bcb6069 JL	372	{ .compatible = "xlnx,xps-gpio-1.00.a", },
	373	{ /* end of list */ },
	374	};
	375
749564ff	376	MODULE_DEVICE_TABLE(of, xgpio_of_match);
0bcb6069	377
749564ff RR	378	static struct platform_driver xgpio_plat_driver = {
	379	.probe = xgpio_probe,
	380	.remove = xgpio_remove,
	381	.driver = {
	382	.name = "gpio-xilinx",
	383	.of_match_table = xgpio_of_match,
	384	},
	385	};
0bcb6069	386
749564ff RR	387	static int __init xgpio_init(void)
	388	{
	389	return platform_driver_register(&xgpio_plat_driver);
0bcb6069 JL	390	}
0bcb6069 JL	391
0bcb6069	392	subsys_initcall(xgpio_init);
749564ff RR	393
	394	static void __exit xgpio_exit(void)
	395	{
	396	platform_driver_unregister(&xgpio_plat_driver);
	397	}
	398	module_exit(xgpio_exit);
0bcb6069 JL	399
	400	MODULE_AUTHOR("Xilinx, Inc.");
	401	MODULE_DESCRIPTION("Xilinx GPIO driver");
	402	MODULE_LICENSE("GPL");