[deliverable/linux.git] / arch / mips / ar7 / gpio.c

/*
 * Copyright (C) 2007 Felix Fietkau <nbd@openwrt.org>
 * Copyright (C) 2007 Eugene Konev <ejka@openwrt.org>
 * Copyright (C) 2009-2010 Florian Fainelli <florian@openwrt.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include <linux/module.h>
#include <linux/gpio.h>

#include <asm/mach-ar7/ar7.h>

#define AR7_GPIO_MAX 32
#define TITAN_GPIO_MAX 51

struct ar7_gpio_chip {
	void __iomem		*regs;
	struct gpio_chip	chip;
};

static int ar7_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
{
	struct ar7_gpio_chip *gpch = gpiochip_get_data(chip);
	void __iomem *gpio_in = gpch->regs + AR7_GPIO_INPUT;

	return !!(readl(gpio_in) & (1 << gpio));
}

static int titan_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
{
	struct ar7_gpio_chip *gpch = gpiochip_get_data(chip);
	void __iomem *gpio_in0 = gpch->regs + TITAN_GPIO_INPUT_0;
	void __iomem *gpio_in1 = gpch->regs + TITAN_GPIO_INPUT_1;

	return readl(gpio >> 5 ? gpio_in1 : gpio_in0) & (1 << (gpio & 0x1f));
}

static void ar7_gpio_set_value(struct gpio_chip *chip,
				unsigned gpio, int value)
{
	struct ar7_gpio_chip *gpch = gpiochip_get_data(chip);
	void __iomem *gpio_out = gpch->regs + AR7_GPIO_OUTPUT;
	unsigned tmp;

	tmp = readl(gpio_out) & ~(1 << gpio);
	if (value)
		tmp |= 1 << gpio;
	writel(tmp, gpio_out);
}

static void titan_gpio_set_value(struct gpio_chip *chip,
				unsigned gpio, int value)
{
	struct ar7_gpio_chip *gpch = gpiochip_get_data(chip);
	void __iomem *gpio_out0 = gpch->regs + TITAN_GPIO_OUTPUT_0;
	void __iomem *gpio_out1 = gpch->regs + TITAN_GPIO_OUTPUT_1;
	unsigned tmp;

	tmp = readl(gpio >> 5 ? gpio_out1 : gpio_out0) & ~(1 << (gpio & 0x1f));
	if (value)
		tmp |= 1 << (gpio & 0x1f);
	writel(tmp, gpio >> 5 ? gpio_out1 : gpio_out0);
}

static int ar7_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
{
	struct ar7_gpio_chip *gpch = gpiochip_get_data(chip);
	void __iomem *gpio_dir = gpch->regs + AR7_GPIO_DIR;

	writel(readl(gpio_dir) | (1 << gpio), gpio_dir);

	return 0;
}

static int titan_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
{
	struct ar7_gpio_chip *gpch = gpiochip_get_data(chip);
	void __iomem *gpio_dir0 = gpch->regs + TITAN_GPIO_DIR_0;
	void __iomem *gpio_dir1 = gpch->regs + TITAN_GPIO_DIR_1;

	if (gpio >= TITAN_GPIO_MAX)
		return -EINVAL;

	writel(readl(gpio >> 5 ? gpio_dir1 : gpio_dir0) | (1 << (gpio & 0x1f)),
			gpio >> 5 ? gpio_dir1 : gpio_dir0);
	return 0;
}

static int ar7_gpio_direction_output(struct gpio_chip *chip,
					unsigned gpio, int value)
{
	struct ar7_gpio_chip *gpch = gpiochip_get_data(chip);
	void __iomem *gpio_dir = gpch->regs + AR7_GPIO_DIR;

	ar7_gpio_set_value(chip, gpio, value);
	writel(readl(gpio_dir) & ~(1 << gpio), gpio_dir);

	return 0;
}

static int titan_gpio_direction_output(struct gpio_chip *chip,
					unsigned gpio, int value)
{
	struct ar7_gpio_chip *gpch = gpiochip_get_data(chip);
	void __iomem *gpio_dir0 = gpch->regs + TITAN_GPIO_DIR_0;
	void __iomem *gpio_dir1 = gpch->regs + TITAN_GPIO_DIR_1;

	if (gpio >= TITAN_GPIO_MAX)
		return -EINVAL;

	titan_gpio_set_value(chip, gpio, value);
	writel(readl(gpio >> 5 ? gpio_dir1 : gpio_dir0) & ~(1 <<
		(gpio & 0x1f)), gpio >> 5 ? gpio_dir1 : gpio_dir0);

	return 0;
}

static struct ar7_gpio_chip ar7_gpio_chip = {
	.chip = {
		.label			= "ar7-gpio",
		.direction_input	= ar7_gpio_direction_input,
		.direction_output	= ar7_gpio_direction_output,
		.set			= ar7_gpio_set_value,
		.get			= ar7_gpio_get_value,
		.base			= 0,
		.ngpio			= AR7_GPIO_MAX,
	}
};

static struct ar7_gpio_chip titan_gpio_chip = {
	.chip = {
		.label			= "titan-gpio",
		.direction_input	= titan_gpio_direction_input,
		.direction_output	= titan_gpio_direction_output,
		.set			= titan_gpio_set_value,
		.get			= titan_gpio_get_value,
		.base			= 0,
		.ngpio			= TITAN_GPIO_MAX,
	}
};

static inline int ar7_gpio_enable_ar7(unsigned gpio)
{
	void __iomem *gpio_en = ar7_gpio_chip.regs + AR7_GPIO_ENABLE;

	writel(readl(gpio_en) | (1 << gpio), gpio_en);

	return 0;
}

static inline int ar7_gpio_enable_titan(unsigned gpio)
{
	void __iomem *gpio_en0 = titan_gpio_chip.regs  + TITAN_GPIO_ENBL_0;
	void __iomem *gpio_en1 = titan_gpio_chip.regs  + TITAN_GPIO_ENBL_1;

	writel(readl(gpio >> 5 ? gpio_en1 : gpio_en0) | (1 << (gpio & 0x1f)),
		gpio >> 5 ? gpio_en1 : gpio_en0);

	return 0;
}

int ar7_gpio_enable(unsigned gpio)
{
	return ar7_is_titan() ? ar7_gpio_enable_titan(gpio) :
				ar7_gpio_enable_ar7(gpio);
}
EXPORT_SYMBOL(ar7_gpio_enable);

static inline int ar7_gpio_disable_ar7(unsigned gpio)
{
	void __iomem *gpio_en = ar7_gpio_chip.regs + AR7_GPIO_ENABLE;

	writel(readl(gpio_en) & ~(1 << gpio), gpio_en);

	return 0;
}

static inline int ar7_gpio_disable_titan(unsigned gpio)
{
	void __iomem *gpio_en0 = titan_gpio_chip.regs + TITAN_GPIO_ENBL_0;
	void __iomem *gpio_en1 = titan_gpio_chip.regs + TITAN_GPIO_ENBL_1;

	writel(readl(gpio >> 5 ? gpio_en1 : gpio_en0) & ~(1 << (gpio & 0x1f)),
			gpio >> 5 ? gpio_en1 : gpio_en0);

	return 0;
}

int ar7_gpio_disable(unsigned gpio)
{
	return ar7_is_titan() ? ar7_gpio_disable_titan(gpio) :
				ar7_gpio_disable_ar7(gpio);
}
EXPORT_SYMBOL(ar7_gpio_disable);

struct titan_gpio_cfg {
	u32 reg;
	u32 shift;
	u32 func;
};

static const struct titan_gpio_cfg titan_gpio_table[] = {
	/* reg, start bit, mux value */
	{4, 24, 1},
	{4, 26, 1},
	{4, 28, 1},
	{4, 30, 1},
	{5, 6, 1},
	{5, 8, 1},
	{5, 10, 1},
	{5, 12, 1},
	{7, 14, 3},
	{7, 16, 3},
	{7, 18, 3},
	{7, 20, 3},
	{7, 22, 3},
	{7, 26, 3},
	{7, 28, 3},
	{7, 30, 3},
	{8, 0, 3},
	{8, 2, 3},
	{8, 4, 3},
	{8, 10, 3},
	{8, 14, 3},
	{8, 16, 3},
	{8, 18, 3},
	{8, 20, 3},
	{9, 8, 3},
	{9, 10, 3},
	{9, 12, 3},
	{9, 14, 3},
	{9, 18, 3},
	{9, 20, 3},
	{9, 24, 3},
	{9, 26, 3},
	{9, 28, 3},
	{9, 30, 3},
	{10, 0, 3},
	{10, 2, 3},
	{10, 8, 3},
	{10, 10, 3},
	{10, 12, 3},
	{10, 14, 3},
	{13, 12, 3},
	{13, 14, 3},
	{13, 16, 3},
	{13, 18, 3},
	{13, 24, 3},
	{13, 26, 3},
	{13, 28, 3},
	{13, 30, 3},
	{14, 2, 3},
	{14, 6, 3},
	{14, 8, 3},
	{14, 12, 3}
};

static int titan_gpio_pinsel(unsigned gpio)
{
	struct titan_gpio_cfg gpio_cfg;
	u32 mux_status, pin_sel_reg, tmp;
	void __iomem *pin_sel = (void __iomem *)KSEG1ADDR(AR7_REGS_PINSEL);

	if (gpio >= ARRAY_SIZE(titan_gpio_table))
		return -EINVAL;

	gpio_cfg = titan_gpio_table[gpio];
	pin_sel_reg = gpio_cfg.reg - 1;

	mux_status = (readl(pin_sel + pin_sel_reg) >> gpio_cfg.shift) & 0x3;

	/* Check the mux status */
	if (!((mux_status == 0) || (mux_status == gpio_cfg.func)))
		return 0;

	/* Set the pin sel value */
	tmp = readl(pin_sel + pin_sel_reg);
	tmp |= ((gpio_cfg.func & 0x3) << gpio_cfg.shift);
	writel(tmp, pin_sel + pin_sel_reg);

	return 0;
}

/* Perform minimal Titan GPIO configuration */
static void titan_gpio_init(void)
{
	unsigned i;

	for (i = 44; i < 48; i++) {
		titan_gpio_pinsel(i);
		ar7_gpio_enable_titan(i);
		titan_gpio_direction_input(&titan_gpio_chip.chip, i);
	}
}

int __init ar7_gpio_init(void)
{
	int ret;
	struct ar7_gpio_chip *gpch;
	unsigned size;

	if (!ar7_is_titan()) {
		gpch = &ar7_gpio_chip;
		size = 0x10;
	} else {
		gpch = &titan_gpio_chip;
		size = 0x1f;
	}

	gpch->regs = ioremap_nocache(AR7_REGS_GPIO, size);
	if (!gpch->regs) {
		printk(KERN_ERR "%s: failed to ioremap regs\n",
					gpch->chip.label);
		return -ENOMEM;
	}

	ret = gpiochip_add_data(&gpch->chip, gpch);
	if (ret) {
		printk(KERN_ERR "%s: failed to add gpiochip\n",
					gpch->chip.label);
		return ret;
	}
	printk(KERN_INFO "%s: registered %d GPIOs\n",
				gpch->chip.label, gpch->chip.ngpio);

	if (ar7_is_titan())
		titan_gpio_init();

	return ret;
}
Commit	Line	Data
7ca5dc14 FF	1	/*
	2	* Copyright (C) 2007 Felix Fietkau <nbd@openwrt.org>
	3	* Copyright (C) 2007 Eugene Konev <ejka@openwrt.org>
238dd317	4	* Copyright (C) 2009-2010 Florian Fainelli <florian@openwrt.org>
7ca5dc14 FF	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 as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	19	*/
	20
	21	#include <linux/module.h>
5f3c9098	22	#include <linux/gpio.h>
7ca5dc14	23
832f5dac AB	24	#include <asm/mach-ar7/ar7.h>
	25
	26	#define AR7_GPIO_MAX 32
	27	#define TITAN_GPIO_MAX 51
7ca5dc14	28
5f3c9098	29	struct ar7_gpio_chip {
4d1da8c2 AC	30	void __iomem *regs;
4d1da8c2 AC	31	struct gpio_chip chip;
5f3c9098	32	};
7ca5dc14	33
5f3c9098	34	static int ar7_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
7ca5dc14	35	{
1b2766fb	36	struct ar7_gpio_chip *gpch = gpiochip_get_data(chip);
5f3c9098	37	void __iomem *gpio_in = gpch->regs + AR7_GPIO_INPUT;
7ca5dc14	38
249e573d	39	return !!(readl(gpio_in) & (1 << gpio));
5f3c9098 FF	40	}
5f3c9098 FF	41
238dd317 FF	42	static int titan_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
238dd317 FF	43	{
1b2766fb	44	struct ar7_gpio_chip *gpch = gpiochip_get_data(chip);
238dd317 FF	45	void __iomem *gpio_in0 = gpch->regs + TITAN_GPIO_INPUT_0;
	46	void __iomem *gpio_in1 = gpch->regs + TITAN_GPIO_INPUT_1;
	47
	48	return readl(gpio >> 5 ? gpio_in1 : gpio_in0) & (1 << (gpio & 0x1f));
	49	}
	50
5f3c9098 FF	51	static void ar7_gpio_set_value(struct gpio_chip *chip,
	52	unsigned gpio, int value)
	53	{
1b2766fb	54	struct ar7_gpio_chip *gpch = gpiochip_get_data(chip);
5f3c9098 FF	55	void __iomem *gpio_out = gpch->regs + AR7_GPIO_OUTPUT;
	56	unsigned tmp;
	57
	58	tmp = readl(gpio_out) & ~(1 << gpio);
	59	if (value)
	60	tmp \|= 1 << gpio;
	61	writel(tmp, gpio_out);
	62	}
	63
238dd317 FF	64	static void titan_gpio_set_value(struct gpio_chip *chip,
	65	unsigned gpio, int value)
	66	{
1b2766fb	67	struct ar7_gpio_chip *gpch = gpiochip_get_data(chip);
238dd317 FF	68	void __iomem *gpio_out0 = gpch->regs + TITAN_GPIO_OUTPUT_0;
	69	void __iomem *gpio_out1 = gpch->regs + TITAN_GPIO_OUTPUT_1;
	70	unsigned tmp;
	71
	72	tmp = readl(gpio >> 5 ? gpio_out1 : gpio_out0) & ~(1 << (gpio & 0x1f));
	73	if (value)
	74	tmp \|= 1 << (gpio & 0x1f);
	75	writel(tmp, gpio >> 5 ? gpio_out1 : gpio_out0);
	76	}
	77
5f3c9098 FF	78	static int ar7_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
5f3c9098 FF	79	{
1b2766fb	80	struct ar7_gpio_chip *gpch = gpiochip_get_data(chip);
5f3c9098	81	void __iomem *gpio_dir = gpch->regs + AR7_GPIO_DIR;
7ca5dc14	82
5f3c9098	83	writel(readl(gpio_dir) \| (1 << gpio), gpio_dir);
7ca5dc14 FF	84
	85	return 0;
	86	}
7ca5dc14	87
238dd317 FF	88	static int titan_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
238dd317 FF	89	{
1b2766fb	90	struct ar7_gpio_chip *gpch = gpiochip_get_data(chip);
238dd317 FF	91	void __iomem *gpio_dir0 = gpch->regs + TITAN_GPIO_DIR_0;
	92	void __iomem *gpio_dir1 = gpch->regs + TITAN_GPIO_DIR_1;
	93
	94	if (gpio >= TITAN_GPIO_MAX)
	95	return -EINVAL;
	96
	97	writel(readl(gpio >> 5 ? gpio_dir1 : gpio_dir0) \| (1 << (gpio & 0x1f)),
	98	gpio >> 5 ? gpio_dir1 : gpio_dir0);
	99	return 0;
	100	}
	101
5f3c9098 FF	102	static int ar7_gpio_direction_output(struct gpio_chip *chip,
5f3c9098 FF	103	unsigned gpio, int value)
7ca5dc14	104	{
1b2766fb	105	struct ar7_gpio_chip *gpch = gpiochip_get_data(chip);
5f3c9098 FF	106	void __iomem *gpio_dir = gpch->regs + AR7_GPIO_DIR;
	107
	108	ar7_gpio_set_value(chip, gpio, value);
	109	writel(readl(gpio_dir) & ~(1 << gpio), gpio_dir);
	110
	111	return 0;
	112	}
	113
238dd317 FF	114	static int titan_gpio_direction_output(struct gpio_chip *chip,
	115	unsigned gpio, int value)
	116	{
1b2766fb	117	struct ar7_gpio_chip *gpch = gpiochip_get_data(chip);
238dd317 FF	118	void __iomem *gpio_dir0 = gpch->regs + TITAN_GPIO_DIR_0;
	119	void __iomem *gpio_dir1 = gpch->regs + TITAN_GPIO_DIR_1;
	120
	121	if (gpio >= TITAN_GPIO_MAX)
	122	return -EINVAL;
	123
	124	titan_gpio_set_value(chip, gpio, value);
	125	writel(readl(gpio >> 5 ? gpio_dir1 : gpio_dir0) & ~(1 <<
	126	(gpio & 0x1f)), gpio >> 5 ? gpio_dir1 : gpio_dir0);
	127
	128	return 0;
	129	}
	130
5f3c9098 FF	131	static struct ar7_gpio_chip ar7_gpio_chip = {
5f3c9098 FF	132	.chip = {
4d1da8c2	133	.label = "ar7-gpio",
5f3c9098 FF	134	.direction_input = ar7_gpio_direction_input,
	135	.direction_output = ar7_gpio_direction_output,
	136	.set = ar7_gpio_set_value,
	137	.get = ar7_gpio_get_value,
	138	.base = 0,
	139	.ngpio = AR7_GPIO_MAX,
	140	}
	141	};
	142
238dd317 FF	143	static struct ar7_gpio_chip titan_gpio_chip = {
	144	.chip = {
	145	.label = "titan-gpio",
	146	.direction_input = titan_gpio_direction_input,
	147	.direction_output = titan_gpio_direction_output,
	148	.set = titan_gpio_set_value,
	149	.get = titan_gpio_get_value,
	150	.base = 0,
	151	.ngpio = TITAN_GPIO_MAX,
	152	}
	153	};
	154
	155	static inline int ar7_gpio_enable_ar7(unsigned gpio)
5f3c9098 FF	156	{
	157	void __iomem *gpio_en = ar7_gpio_chip.regs + AR7_GPIO_ENABLE;
	158
	159	writel(readl(gpio_en) \| (1 << gpio), gpio_en);
	160
	161	return 0;
	162	}
238dd317 FF	163
	164	static inline int ar7_gpio_enable_titan(unsigned gpio)
	165	{
	166	void __iomem *gpio_en0 = titan_gpio_chip.regs + TITAN_GPIO_ENBL_0;
	167	void __iomem *gpio_en1 = titan_gpio_chip.regs + TITAN_GPIO_ENBL_1;
	168
	169	writel(readl(gpio >> 5 ? gpio_en1 : gpio_en0) \| (1 << (gpio & 0x1f)),
	170	gpio >> 5 ? gpio_en1 : gpio_en0);
	171
	172	return 0;
	173	}
	174
	175	int ar7_gpio_enable(unsigned gpio)
	176	{
	177	return ar7_is_titan() ? ar7_gpio_enable_titan(gpio) :
	178	ar7_gpio_enable_ar7(gpio);
	179	}
5f3c9098 FF	180	EXPORT_SYMBOL(ar7_gpio_enable);
5f3c9098 FF	181
238dd317	182	static inline int ar7_gpio_disable_ar7(unsigned gpio)
5f3c9098 FF	183	{
	184	void __iomem *gpio_en = ar7_gpio_chip.regs + AR7_GPIO_ENABLE;
	185
	186	writel(readl(gpio_en) & ~(1 << gpio), gpio_en);
	187
	188	return 0;
	189	}
238dd317 FF	190
	191	static inline int ar7_gpio_disable_titan(unsigned gpio)
	192	{
	193	void __iomem *gpio_en0 = titan_gpio_chip.regs + TITAN_GPIO_ENBL_0;
	194	void __iomem *gpio_en1 = titan_gpio_chip.regs + TITAN_GPIO_ENBL_1;
	195
	196	writel(readl(gpio >> 5 ? gpio_en1 : gpio_en0) & ~(1 << (gpio & 0x1f)),
	197	gpio >> 5 ? gpio_en1 : gpio_en0);
	198
	199	return 0;
	200	}
	201
	202	int ar7_gpio_disable(unsigned gpio)
	203	{
	204	return ar7_is_titan() ? ar7_gpio_disable_titan(gpio) :
	205	ar7_gpio_disable_ar7(gpio);
	206	}
5f3c9098 FF	207	EXPORT_SYMBOL(ar7_gpio_disable);
5f3c9098 FF	208
238dd317 FF	209	struct titan_gpio_cfg {
	210	u32 reg;
	211	u32 shift;
	212	u32 func;
	213	};
	214
edc9ded1	215	static const struct titan_gpio_cfg titan_gpio_table[] = {
238dd317 FF	216	/* reg, start bit, mux value */
	217	{4, 24, 1},
	218	{4, 26, 1},
	219	{4, 28, 1},
	220	{4, 30, 1},
	221	{5, 6, 1},
	222	{5, 8, 1},
	223	{5, 10, 1},
	224	{5, 12, 1},
	225	{7, 14, 3},
	226	{7, 16, 3},
	227	{7, 18, 3},
	228	{7, 20, 3},
	229	{7, 22, 3},
	230	{7, 26, 3},
	231	{7, 28, 3},
	232	{7, 30, 3},
	233	{8, 0, 3},
	234	{8, 2, 3},
	235	{8, 4, 3},
	236	{8, 10, 3},
	237	{8, 14, 3},
	238	{8, 16, 3},
	239	{8, 18, 3},
	240	{8, 20, 3},
	241	{9, 8, 3},
	242	{9, 10, 3},
	243	{9, 12, 3},
	244	{9, 14, 3},
	245	{9, 18, 3},
	246	{9, 20, 3},
	247	{9, 24, 3},
	248	{9, 26, 3},
	249	{9, 28, 3},
	250	{9, 30, 3},
	251	{10, 0, 3},
	252	{10, 2, 3},
	253	{10, 8, 3},
	254	{10, 10, 3},
	255	{10, 12, 3},
	256	{10, 14, 3},
	257	{13, 12, 3},
	258	{13, 14, 3},
	259	{13, 16, 3},
	260	{13, 18, 3},
	261	{13, 24, 3},
	262	{13, 26, 3},
	263	{13, 28, 3},
	264	{13, 30, 3},
	265	{14, 2, 3},
	266	{14, 6, 3},
	267	{14, 8, 3},
	268	{14, 12, 3}
	269	};
	270
	271	static int titan_gpio_pinsel(unsigned gpio)
	272	{
	273	struct titan_gpio_cfg gpio_cfg;
	274	u32 mux_status, pin_sel_reg, tmp;
	275	void __iomem pin_sel = (void __iomem )KSEG1ADDR(AR7_REGS_PINSEL);
	276
	277	if (gpio >= ARRAY_SIZE(titan_gpio_table))
	278	return -EINVAL;
	279
280	gpio_cfg = titan_gpio_table[gpio];
281	pin_sel_reg = gpio_cfg.reg - 1;
282
283	mux_status = (readl(pin_sel + pin_sel_reg) >> gpio_cfg.shift) & 0x3;
284
285	/* Check the mux status */
286	if (!((mux_status == 0) \|\| (mux_status == gpio_cfg.func)))
287	return 0;
288
289	/* Set the pin sel value */
290	tmp = readl(pin_sel + pin_sel_reg);
291	tmp \|= ((gpio_cfg.func & 0x3) << gpio_cfg.shift);
292	writel(tmp, pin_sel + pin_sel_reg);
293
294	return 0;
295	}
296
297	/* Perform minimal Titan GPIO configuration */
298	static void titan_gpio_init(void)
299	{
300	unsigned i;
301
302	for (i = 44; i < 48; i++) {
303	titan_gpio_pinsel(i);
304	ar7_gpio_enable_titan(i);
305	titan_gpio_direction_input(&titan_gpio_chip.chip, i);
306	}
307	}
308
3bc6968a	309	int __init ar7_gpio_init(void)
5f3c9098 FF	310	{
5f3c9098 FF	311	int ret;
238dd317 FF	312	struct ar7_gpio_chip *gpch;
	313	unsigned size;
	314
	315	if (!ar7_is_titan()) {
	316	gpch = &ar7_gpio_chip;
	317	size = 0x10;
	318	} else {
	319	gpch = &titan_gpio_chip;
	320	size = 0x1f;
	321	}
5f3c9098	322
3e9957b4	323	gpch->regs = ioremap_nocache(AR7_REGS_GPIO, size);
238dd317 FF	324	if (!gpch->regs) {
	325	printk(KERN_ERR "%s: failed to ioremap regs\n",
	326	gpch->chip.label);
5f3c9098 FF	327	return -ENOMEM;
	328	}
	329
1b2766fb	330	ret = gpiochip_add_data(&gpch->chip, gpch);
5f3c9098	331	if (ret) {
238dd317 FF	332	printk(KERN_ERR "%s: failed to add gpiochip\n",
238dd317 FF	333	gpch->chip.label);
5f3c9098 FF	334	return ret;
5f3c9098 FF	335	}
238dd317 FF	336	printk(KERN_INFO "%s: registered %d GPIOs\n",
	337	gpch->chip.label, gpch->chip.ngpio);
	338
	339	if (ar7_is_titan())
	340	titan_gpio_init();
	341
5f3c9098	342	return ret;
7ca5dc14	343	}