[linux.git] / arch / powerpc / platforms / 52xx / mpc52xx_gpio.c

/*
 * MPC52xx gpio driver
 *
 * Copyright (c) 2008 Sascha Hauer <[email protected]>, Pengutronix
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * 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/of.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/of_gpio.h>
#include <linux/io.h>
#include <linux/of_platform.h>

#include <asm/gpio.h>
#include <asm/mpc52xx.h>
#include <sysdev/fsl_soc.h>

static DEFINE_SPINLOCK(gpio_lock);

struct mpc52xx_gpiochip {
	struct of_mm_gpio_chip mmchip;
	unsigned int shadow_dvo;
	unsigned int shadow_gpioe;
	unsigned int shadow_ddr;
};

/*
 * GPIO LIB API implementation for wakeup GPIOs.
 *
 * There's a maximum of 8 wakeup GPIOs. Which of these are available
 * for use depends on your board setup.
 *
 * 0 -> GPIO_WKUP_7
 * 1 -> GPIO_WKUP_6
 * 2 -> PSC6_1
 * 3 -> PSC6_0
 * 4 -> ETH_17
 * 5 -> PSC3_9
 * 6 -> PSC2_4
 * 7 -> PSC1_4
 *
 */
static int mpc52xx_wkup_gpio_get(struct gpio_chip *gc, unsigned int gpio)
{
	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
	struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
	unsigned int ret;

	ret = (in_8(&regs->wkup_ival) >> (7 - gpio)) & 1;

	pr_debug("%s: gpio: %d ret: %d\n", __func__, gpio, ret);

	return ret;
}

static inline void
__mpc52xx_wkup_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
{
	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
	struct mpc52xx_gpiochip *chip = container_of(mm_gc,
			struct mpc52xx_gpiochip, mmchip);
	struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;

	if (val)
		chip->shadow_dvo |= 1 << (7 - gpio);
	else
		chip->shadow_dvo &= ~(1 << (7 - gpio));

	out_8(&regs->wkup_dvo, chip->shadow_dvo);
}

static void
mpc52xx_wkup_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
{
	unsigned long flags;

	spin_lock_irqsave(&gpio_lock, flags);

	__mpc52xx_wkup_gpio_set(gc, gpio, val);

	spin_unlock_irqrestore(&gpio_lock, flags);

	pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
}

static int mpc52xx_wkup_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
{
	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
	struct mpc52xx_gpiochip *chip = container_of(mm_gc,
			struct mpc52xx_gpiochip, mmchip);
	struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
	unsigned long flags;

	spin_lock_irqsave(&gpio_lock, flags);

	/* set the direction */
	chip->shadow_ddr &= ~(1 << (7 - gpio));
	out_8(&regs->wkup_ddr, chip->shadow_ddr);

	/* and enable the pin */
	chip->shadow_gpioe |= 1 << (7 - gpio);
	out_8(&regs->wkup_gpioe, chip->shadow_gpioe);

	spin_unlock_irqrestore(&gpio_lock, flags);

	return 0;
}

static int
mpc52xx_wkup_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
{
	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
	struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
	struct mpc52xx_gpiochip *chip = container_of(mm_gc,
			struct mpc52xx_gpiochip, mmchip);
	unsigned long flags;

	spin_lock_irqsave(&gpio_lock, flags);

	__mpc52xx_wkup_gpio_set(gc, gpio, val);

	/* Then set direction */
	chip->shadow_ddr |= 1 << (7 - gpio);
	out_8(&regs->wkup_ddr, chip->shadow_ddr);

	/* Finally enable the pin */
	chip->shadow_gpioe |= 1 << (7 - gpio);
	out_8(&regs->wkup_gpioe, chip->shadow_gpioe);

	spin_unlock_irqrestore(&gpio_lock, flags);

	pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);

	return 0;
}

static int __devinit mpc52xx_wkup_gpiochip_probe(struct of_device *ofdev,
					const struct of_device_id *match)
{
	struct mpc52xx_gpiochip *chip;
	struct mpc52xx_gpio_wkup __iomem *regs;
	struct of_gpio_chip *ofchip;
	int ret;

	chip = kzalloc(sizeof(*chip), GFP_KERNEL);
	if (!chip)
		return -ENOMEM;

	ofchip = &chip->mmchip.of_gc;

	ofchip->gpio_cells          = 2;
	ofchip->gc.ngpio            = 8;
	ofchip->gc.direction_input  = mpc52xx_wkup_gpio_dir_in;
	ofchip->gc.direction_output = mpc52xx_wkup_gpio_dir_out;
	ofchip->gc.get              = mpc52xx_wkup_gpio_get;
	ofchip->gc.set              = mpc52xx_wkup_gpio_set;

	ret = of_mm_gpiochip_add(ofdev->dev.of_node, &chip->mmchip);
	if (ret)
		return ret;

	regs = chip->mmchip.regs;
	chip->shadow_gpioe = in_8(&regs->wkup_gpioe);
	chip->shadow_ddr = in_8(&regs->wkup_ddr);
	chip->shadow_dvo = in_8(&regs->wkup_dvo);

	return 0;
}

static int mpc52xx_gpiochip_remove(struct of_device *ofdev)
{
	return -EBUSY;
}

static const struct of_device_id mpc52xx_wkup_gpiochip_match[] = {
	{
		.compatible = "fsl,mpc5200-gpio-wkup",
	},
	{}
};

static struct of_platform_driver mpc52xx_wkup_gpiochip_driver = {
	.name = "gpio_wkup",
	.match_table = mpc52xx_wkup_gpiochip_match,
	.probe = mpc52xx_wkup_gpiochip_probe,
	.remove = mpc52xx_gpiochip_remove,
};

/*
 * GPIO LIB API implementation for simple GPIOs
 *
 * There's a maximum of 32 simple GPIOs. Which of these are available
 * for use depends on your board setup.
 * The numbering reflects the bit numbering in the port registers:
 *
 *  0..1  > reserved
 *  2..3  > IRDA
 *  4..7  > ETHR
 *  8..11 > reserved
 * 12..15 > USB
 * 16..17 > reserved
 * 18..23 > PSC3
 * 24..27 > PSC2
 * 28..31 > PSC1
 */
static int mpc52xx_simple_gpio_get(struct gpio_chip *gc, unsigned int gpio)
{
	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
	struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
	unsigned int ret;

	ret = (in_be32(&regs->simple_ival) >> (31 - gpio)) & 1;

	return ret;
}

static inline void
__mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
{
	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
	struct mpc52xx_gpiochip *chip = container_of(mm_gc,
			struct mpc52xx_gpiochip, mmchip);
	struct mpc52xx_gpio __iomem *regs = mm_gc->regs;

	if (val)
		chip->shadow_dvo |= 1 << (31 - gpio);
	else
		chip->shadow_dvo &= ~(1 << (31 - gpio));
	out_be32(&regs->simple_dvo, chip->shadow_dvo);
}

static void
mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
{
	unsigned long flags;

	spin_lock_irqsave(&gpio_lock, flags);

	__mpc52xx_simple_gpio_set(gc, gpio, val);

	spin_unlock_irqrestore(&gpio_lock, flags);

	pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
}

static int mpc52xx_simple_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
{
	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
	struct mpc52xx_gpiochip *chip = container_of(mm_gc,
			struct mpc52xx_gpiochip, mmchip);
	struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
	unsigned long flags;

	spin_lock_irqsave(&gpio_lock, flags);

	/* set the direction */
	chip->shadow_ddr &= ~(1 << (31 - gpio));
	out_be32(&regs->simple_ddr, chip->shadow_ddr);

	/* and enable the pin */
	chip->shadow_gpioe |= 1 << (31 - gpio);
	out_be32(&regs->simple_gpioe, chip->shadow_gpioe);

	spin_unlock_irqrestore(&gpio_lock, flags);

	return 0;
}

static int
mpc52xx_simple_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
{
	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
	struct mpc52xx_gpiochip *chip = container_of(mm_gc,
			struct mpc52xx_gpiochip, mmchip);
	struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
	unsigned long flags;

	spin_lock_irqsave(&gpio_lock, flags);

	/* First set initial value */
	__mpc52xx_simple_gpio_set(gc, gpio, val);

	/* Then set direction */
	chip->shadow_ddr |= 1 << (31 - gpio);
	out_be32(&regs->simple_ddr, chip->shadow_ddr);

	/* Finally enable the pin */
	chip->shadow_gpioe |= 1 << (31 - gpio);
	out_be32(&regs->simple_gpioe, chip->shadow_gpioe);

	spin_unlock_irqrestore(&gpio_lock, flags);

	pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);

	return 0;
}

static int __devinit mpc52xx_simple_gpiochip_probe(struct of_device *ofdev,
					const struct of_device_id *match)
{
	struct mpc52xx_gpiochip *chip;
	struct of_gpio_chip *ofchip;
	struct mpc52xx_gpio __iomem *regs;
	int ret;

	chip = kzalloc(sizeof(*chip), GFP_KERNEL);
	if (!chip)
		return -ENOMEM;

	ofchip = &chip->mmchip.of_gc;

	ofchip->gpio_cells          = 2;
	ofchip->gc.ngpio            = 32;
	ofchip->gc.direction_input  = mpc52xx_simple_gpio_dir_in;
	ofchip->gc.direction_output = mpc52xx_simple_gpio_dir_out;
	ofchip->gc.get              = mpc52xx_simple_gpio_get;
	ofchip->gc.set              = mpc52xx_simple_gpio_set;

	ret = of_mm_gpiochip_add(ofdev->dev.of_node, &chip->mmchip);
	if (ret)
		return ret;

	regs = chip->mmchip.regs;
	chip->shadow_gpioe = in_be32(&regs->simple_gpioe);
	chip->shadow_ddr = in_be32(&regs->simple_ddr);
	chip->shadow_dvo = in_be32(&regs->simple_dvo);

	return 0;
}

static const struct of_device_id mpc52xx_simple_gpiochip_match[] = {
	{
		.compatible = "fsl,mpc5200-gpio",
	},
	{}
};

static struct of_platform_driver mpc52xx_simple_gpiochip_driver = {
	.name = "gpio",
	.match_table = mpc52xx_simple_gpiochip_match,
	.probe = mpc52xx_simple_gpiochip_probe,
	.remove = mpc52xx_gpiochip_remove,
};

static int __init mpc52xx_gpio_init(void)
{
	if (of_register_platform_driver(&mpc52xx_wkup_gpiochip_driver))
		printk(KERN_ERR "Unable to register wakeup GPIO driver\n");

	if (of_register_platform_driver(&mpc52xx_simple_gpiochip_driver))
		printk(KERN_ERR "Unable to register simple GPIO driver\n");

	return 0;
}


/* Make sure we get initialised before anyone else tries to use us */
subsys_initcall(mpc52xx_gpio_init);

/* No exit call at the moment as we cannot unregister of gpio chips */

MODULE_DESCRIPTION("Freescale MPC52xx gpio driver");
MODULE_AUTHOR("Sascha Hauer <[email protected]");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
3cd2550c SH	1	/*
	2	* MPC52xx gpio driver
	3	*
	4	* Copyright (c) 2008 Sascha Hauer <[email protected]>, Pengutronix
	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	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*
	15	* You should have received a copy of the GNU General Public License
	16	* along with this program; if not, write to the Free Software
	17	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	18	*/
	19
	20	#include <linux/of.h>
	21	#include <linux/kernel.h>
5a0e3ad6	22	#include <linux/slab.h>
3cd2550c SH	23	#include <linux/of_gpio.h>
	24	#include <linux/io.h>
	25	#include <linux/of_platform.h>
	26
	27	#include <asm/gpio.h>
	28	#include <asm/mpc52xx.h>
	29	#include <sysdev/fsl_soc.h>
	30
	31	static DEFINE_SPINLOCK(gpio_lock);
	32
	33	struct mpc52xx_gpiochip {
	34	struct of_mm_gpio_chip mmchip;
	35	unsigned int shadow_dvo;
	36	unsigned int shadow_gpioe;
	37	unsigned int shadow_ddr;
	38	};
	39
	40	/*
	41	* GPIO LIB API implementation for wakeup GPIOs.
	42	*
	43	* There's a maximum of 8 wakeup GPIOs. Which of these are available
	44	* for use depends on your board setup.
	45	*
	46	* 0 -> GPIO_WKUP_7
	47	* 1 -> GPIO_WKUP_6
	48	* 2 -> PSC6_1
	49	* 3 -> PSC6_0
	50	* 4 -> ETH_17
	51	* 5 -> PSC3_9
	52	* 6 -> PSC2_4
	53	* 7 -> PSC1_4
	54	*
	55	*/
	56	static int mpc52xx_wkup_gpio_get(struct gpio_chip *gc, unsigned int gpio)
	57	{
	58	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
	59	struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
	60	unsigned int ret;
	61
	62	ret = (in_8(&regs->wkup_ival) >> (7 - gpio)) & 1;
	63
	64	pr_debug("%s: gpio: %d ret: %d\n", __func__, gpio, ret);
	65
	66	return ret;
	67	}
	68
	69	static inline void
	70	__mpc52xx_wkup_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
	71	{
	72	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
	73	struct mpc52xx_gpiochip *chip = container_of(mm_gc,
	74	struct mpc52xx_gpiochip, mmchip);
	75	struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
	76
	77	if (val)
	78	chip->shadow_dvo \|= 1 << (7 - gpio);
	79	else
	80	chip->shadow_dvo &= ~(1 << (7 - gpio));
	81
	82	out_8(&regs->wkup_dvo, chip->shadow_dvo);
	83	}
	84
	85	static void
	86	mpc52xx_wkup_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
87	{
88	unsigned long flags;
89
90	spin_lock_irqsave(&gpio_lock, flags);
91
92	__mpc52xx_wkup_gpio_set(gc, gpio, val);
93
94	spin_unlock_irqrestore(&gpio_lock, flags);
95
96	pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
97	}
98
99	static int mpc52xx_wkup_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
100	{
101	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
102	struct mpc52xx_gpiochip *chip = container_of(mm_gc,
103	struct mpc52xx_gpiochip, mmchip);
93072457	104	struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
3cd2550c SH	105	unsigned long flags;
	106
	107	spin_lock_irqsave(&gpio_lock, flags);
	108
	109	/* set the direction */
	110	chip->shadow_ddr &= ~(1 << (7 - gpio));
	111	out_8(&regs->wkup_ddr, chip->shadow_ddr);
	112
	113	/* and enable the pin */
	114	chip->shadow_gpioe \|= 1 << (7 - gpio);
	115	out_8(&regs->wkup_gpioe, chip->shadow_gpioe);
	116
	117	spin_unlock_irqrestore(&gpio_lock, flags);
	118
	119	return 0;
	120	}
	121
	122	static int
	123	mpc52xx_wkup_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
	124	{
	125	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
93072457	126	struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
3cd2550c SH	127	struct mpc52xx_gpiochip *chip = container_of(mm_gc,
	128	struct mpc52xx_gpiochip, mmchip);
	129	unsigned long flags;
	130
	131	spin_lock_irqsave(&gpio_lock, flags);
	132
	133	__mpc52xx_wkup_gpio_set(gc, gpio, val);
	134
	135	/* Then set direction */
	136	chip->shadow_ddr \|= 1 << (7 - gpio);
	137	out_8(&regs->wkup_ddr, chip->shadow_ddr);
	138
	139	/* Finally enable the pin */
	140	chip->shadow_gpioe \|= 1 << (7 - gpio);
	141	out_8(&regs->wkup_gpioe, chip->shadow_gpioe);
	142
	143	spin_unlock_irqrestore(&gpio_lock, flags);
	144
	145	pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
	146
	147	return 0;
	148	}
	149
	150	static int __devinit mpc52xx_wkup_gpiochip_probe(struct of_device *ofdev,
	151	const struct of_device_id *match)
	152	{
	153	struct mpc52xx_gpiochip *chip;
93072457	154	struct mpc52xx_gpio_wkup __iomem *regs;
3cd2550c SH	155	struct of_gpio_chip *ofchip;
	156	int ret;
	157
	158	chip = kzalloc(sizeof(*chip), GFP_KERNEL);
	159	if (!chip)
	160	return -ENOMEM;
	161
	162	ofchip = &chip->mmchip.of_gc;
	163
	164	ofchip->gpio_cells = 2;
	165	ofchip->gc.ngpio = 8;
	166	ofchip->gc.direction_input = mpc52xx_wkup_gpio_dir_in;
	167	ofchip->gc.direction_output = mpc52xx_wkup_gpio_dir_out;
	168	ofchip->gc.get = mpc52xx_wkup_gpio_get;
	169	ofchip->gc.set = mpc52xx_wkup_gpio_set;
	170
61c7a080	171	ret = of_mm_gpiochip_add(ofdev->dev.of_node, &chip->mmchip);
3cd2550c SH	172	if (ret)
	173	return ret;
	174
	175	regs = chip->mmchip.regs;
	176	chip->shadow_gpioe = in_8(&regs->wkup_gpioe);
	177	chip->shadow_ddr = in_8(&regs->wkup_ddr);
	178	chip->shadow_dvo = in_8(&regs->wkup_dvo);
	179
	180	return 0;
	181	}
	182
	183	static int mpc52xx_gpiochip_remove(struct of_device *ofdev)
	184	{
	185	return -EBUSY;
	186	}
	187
	188	static const struct of_device_id mpc52xx_wkup_gpiochip_match[] = {
	189	{
	190	.compatible = "fsl,mpc5200-gpio-wkup",
	191	},
	192	{}
	193	};
	194
	195	static struct of_platform_driver mpc52xx_wkup_gpiochip_driver = {
	196	.name = "gpio_wkup",
	197	.match_table = mpc52xx_wkup_gpiochip_match,
	198	.probe = mpc52xx_wkup_gpiochip_probe,
	199	.remove = mpc52xx_gpiochip_remove,
	200	};
	201
	202	/*
	203	* GPIO LIB API implementation for simple GPIOs
	204	*
	205	* There's a maximum of 32 simple GPIOs. Which of these are available
	206	* for use depends on your board setup.
	207	* The numbering reflects the bit numbering in the port registers:
	208	*
	209	* 0..1 > reserved
	210	* 2..3 > IRDA
	211	* 4..7 > ETHR
	212	* 8..11 > reserved
	213	* 12..15 > USB
	214	* 16..17 > reserved
	215	* 18..23 > PSC3
	216	* 24..27 > PSC2
	217	* 28..31 > PSC1
	218	*/
	219	static int mpc52xx_simple_gpio_get(struct gpio_chip *gc, unsigned int gpio)
	220	{
	221	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
	222	struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
	223	unsigned int ret;
	224
	225	ret = (in_be32(&regs->simple_ival) >> (31 - gpio)) & 1;
	226
	227	return ret;
	228	}
	229
	230	static inline void
	231	__mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
	232	{
	233	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
	234	struct mpc52xx_gpiochip *chip = container_of(mm_gc,
	235	struct mpc52xx_gpiochip, mmchip);
236	struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
237
238	if (val)
239	chip->shadow_dvo \|= 1 << (31 - gpio);
240	else
241	chip->shadow_dvo &= ~(1 << (31 - gpio));
242	out_be32(&regs->simple_dvo, chip->shadow_dvo);
243	}
244
245	static void
246	mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
247	{
248	unsigned long flags;
249
250	spin_lock_irqsave(&gpio_lock, flags);
251
252	__mpc52xx_simple_gpio_set(gc, gpio, val);
253
254	spin_unlock_irqrestore(&gpio_lock, flags);
255
256	pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
257	}
258
259	static int mpc52xx_simple_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
260	{
261	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
262	struct mpc52xx_gpiochip *chip = container_of(mm_gc,
263	struct mpc52xx_gpiochip, mmchip);
93072457	264	struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
3cd2550c SH	265	unsigned long flags;
	266
	267	spin_lock_irqsave(&gpio_lock, flags);
	268
	269	/* set the direction */
	270	chip->shadow_ddr &= ~(1 << (31 - gpio));
	271	out_be32(&regs->simple_ddr, chip->shadow_ddr);
	272
	273	/* and enable the pin */
	274	chip->shadow_gpioe \|= 1 << (31 - gpio);
	275	out_be32(&regs->simple_gpioe, chip->shadow_gpioe);
	276
	277	spin_unlock_irqrestore(&gpio_lock, flags);
	278
	279	return 0;
	280	}
	281
	282	static int
	283	mpc52xx_simple_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
	284	{
	285	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
	286	struct mpc52xx_gpiochip *chip = container_of(mm_gc,
	287	struct mpc52xx_gpiochip, mmchip);
93072457	288	struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
3cd2550c SH	289	unsigned long flags;
	290
	291	spin_lock_irqsave(&gpio_lock, flags);
	292
	293	/* First set initial value */
	294	__mpc52xx_simple_gpio_set(gc, gpio, val);
	295
	296	/* Then set direction */
	297	chip->shadow_ddr \|= 1 << (31 - gpio);
	298	out_be32(&regs->simple_ddr, chip->shadow_ddr);
	299
	300	/* Finally enable the pin */
	301	chip->shadow_gpioe \|= 1 << (31 - gpio);
	302	out_be32(&regs->simple_gpioe, chip->shadow_gpioe);
	303
	304	spin_unlock_irqrestore(&gpio_lock, flags);
	305
	306	pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
	307
	308	return 0;
	309	}
	310
	311	static int __devinit mpc52xx_simple_gpiochip_probe(struct of_device *ofdev,
	312	const struct of_device_id *match)
	313	{
	314	struct mpc52xx_gpiochip *chip;
	315	struct of_gpio_chip *ofchip;
93072457	316	struct mpc52xx_gpio __iomem *regs;
3cd2550c SH	317	int ret;
	318
	319	chip = kzalloc(sizeof(*chip), GFP_KERNEL);
	320	if (!chip)
	321	return -ENOMEM;
	322
	323	ofchip = &chip->mmchip.of_gc;
	324
	325	ofchip->gpio_cells = 2;
	326	ofchip->gc.ngpio = 32;
	327	ofchip->gc.direction_input = mpc52xx_simple_gpio_dir_in;
	328	ofchip->gc.direction_output = mpc52xx_simple_gpio_dir_out;
	329	ofchip->gc.get = mpc52xx_simple_gpio_get;
	330	ofchip->gc.set = mpc52xx_simple_gpio_set;
	331
61c7a080	332	ret = of_mm_gpiochip_add(ofdev->dev.of_node, &chip->mmchip);
3cd2550c SH	333	if (ret)
	334	return ret;
	335
	336	regs = chip->mmchip.regs;
	337	chip->shadow_gpioe = in_be32(&regs->simple_gpioe);
	338	chip->shadow_ddr = in_be32(&regs->simple_ddr);
	339	chip->shadow_dvo = in_be32(&regs->simple_dvo);
	340
	341	return 0;
	342	}
	343
	344	static const struct of_device_id mpc52xx_simple_gpiochip_match[] = {
	345	{
	346	.compatible = "fsl,mpc5200-gpio",
	347	},
	348	{}
	349	};
	350
	351	static struct of_platform_driver mpc52xx_simple_gpiochip_driver = {
	352	.name = "gpio",
	353	.match_table = mpc52xx_simple_gpiochip_match,
	354	.probe = mpc52xx_simple_gpiochip_probe,
	355	.remove = mpc52xx_gpiochip_remove,
	356	};
	357
3cd2550c SH	358	static int __init mpc52xx_gpio_init(void)
	359	{
	360	if (of_register_platform_driver(&mpc52xx_wkup_gpiochip_driver))
	361	printk(KERN_ERR "Unable to register wakeup GPIO driver\n");
	362
	363	if (of_register_platform_driver(&mpc52xx_simple_gpiochip_driver))
	364	printk(KERN_ERR "Unable to register simple GPIO driver\n");
	365
3cd2550c SH	366	return 0;
	367	}
	368
	369
	370	/* Make sure we get initialised before anyone else tries to use us */
	371	subsys_initcall(mpc52xx_gpio_init);
	372
	373	/* No exit call at the moment as we cannot unregister of gpio chips */
	374
	375	MODULE_DESCRIPTION("Freescale MPC52xx gpio driver");
	376	MODULE_AUTHOR("Sascha Hauer <[email protected]");
	377	MODULE_LICENSE("GPL v2");
	378