[linux.git] / drivers / gpio / gpio-tnetv107x.c

/*
 * Texas Instruments TNETV107X GPIO Controller
 *
 * Copyright (C) 2010 Texas Instruments
 *
 * 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 version 2.
 *
 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
 * kind, whether express or implied; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/gpio.h>

#include <mach/common.h>
#include <mach/tnetv107x.h>

struct tnetv107x_gpio_regs {
	u32	idver;
	u32	data_in[3];
	u32	data_out[3];
	u32	direction[3];
	u32	enable[3];
};

#define gpio_reg_index(gpio)	((gpio) >> 5)
#define gpio_reg_bit(gpio)	BIT((gpio) & 0x1f)

#define gpio_reg_rmw(reg, mask, val)	\
	__raw_writel((__raw_readl(reg) & ~(mask)) | (val), (reg))

#define gpio_reg_set_bit(reg, gpio)	\
	gpio_reg_rmw((reg) + gpio_reg_index(gpio), 0, gpio_reg_bit(gpio))

#define gpio_reg_clear_bit(reg, gpio)	\
	gpio_reg_rmw((reg) + gpio_reg_index(gpio), gpio_reg_bit(gpio), 0)

#define gpio_reg_get_bit(reg, gpio)	\
	(__raw_readl((reg) + gpio_reg_index(gpio)) & gpio_reg_bit(gpio))

#define chip2controller(chip)		\
	container_of(chip, struct davinci_gpio_controller, chip)

#define TNETV107X_GPIO_CTLRS	DIV_ROUND_UP(TNETV107X_N_GPIO, 32)

static struct davinci_gpio_controller chips[TNETV107X_GPIO_CTLRS];

static int tnetv107x_gpio_request(struct gpio_chip *chip, unsigned offset)
{
	struct davinci_gpio_controller *ctlr = chip2controller(chip);
	struct tnetv107x_gpio_regs __iomem *regs = ctlr->regs;
	unsigned gpio = chip->base + offset;
	unsigned long flags;

	spin_lock_irqsave(&ctlr->lock, flags);

	gpio_reg_set_bit(regs->enable, gpio);

	spin_unlock_irqrestore(&ctlr->lock, flags);

	return 0;
}

static void tnetv107x_gpio_free(struct gpio_chip *chip, unsigned offset)
{
	struct davinci_gpio_controller *ctlr = chip2controller(chip);
	struct tnetv107x_gpio_regs __iomem *regs = ctlr->regs;
	unsigned gpio = chip->base + offset;
	unsigned long flags;

	spin_lock_irqsave(&ctlr->lock, flags);

	gpio_reg_clear_bit(regs->enable, gpio);

	spin_unlock_irqrestore(&ctlr->lock, flags);
}

static int tnetv107x_gpio_dir_in(struct gpio_chip *chip, unsigned offset)
{
	struct davinci_gpio_controller *ctlr = chip2controller(chip);
	struct tnetv107x_gpio_regs __iomem *regs = ctlr->regs;
	unsigned gpio = chip->base + offset;
	unsigned long flags;

	spin_lock_irqsave(&ctlr->lock, flags);

	gpio_reg_set_bit(regs->direction, gpio);

	spin_unlock_irqrestore(&ctlr->lock, flags);

	return 0;
}

static int tnetv107x_gpio_dir_out(struct gpio_chip *chip,
		unsigned offset, int value)
{
	struct davinci_gpio_controller *ctlr = chip2controller(chip);
	struct tnetv107x_gpio_regs __iomem *regs = ctlr->regs;
	unsigned gpio = chip->base + offset;
	unsigned long flags;

	spin_lock_irqsave(&ctlr->lock, flags);

	if (value)
		gpio_reg_set_bit(regs->data_out, gpio);
	else
		gpio_reg_clear_bit(regs->data_out, gpio);

	gpio_reg_clear_bit(regs->direction, gpio);

	spin_unlock_irqrestore(&ctlr->lock, flags);

	return 0;
}

static int tnetv107x_gpio_get(struct gpio_chip *chip, unsigned offset)
{
	struct davinci_gpio_controller *ctlr = chip2controller(chip);
	struct tnetv107x_gpio_regs __iomem *regs = ctlr->regs;
	unsigned gpio = chip->base + offset;
	int ret;

	ret = gpio_reg_get_bit(regs->data_in, gpio);

	return ret ? 1 : 0;
}

static void tnetv107x_gpio_set(struct gpio_chip *chip,
		unsigned offset, int value)
{
	struct davinci_gpio_controller *ctlr = chip2controller(chip);
	struct tnetv107x_gpio_regs __iomem *regs = ctlr->regs;
	unsigned gpio = chip->base + offset;
	unsigned long flags;

	spin_lock_irqsave(&ctlr->lock, flags);

	if (value)
		gpio_reg_set_bit(regs->data_out, gpio);
	else
		gpio_reg_clear_bit(regs->data_out, gpio);

	spin_unlock_irqrestore(&ctlr->lock, flags);
}

static int __init tnetv107x_gpio_setup(void)
{
	int i, base;
	unsigned ngpio;
	struct davinci_soc_info *soc_info = &davinci_soc_info;
	struct tnetv107x_gpio_regs *regs;
	struct davinci_gpio_controller *ctlr;

	if (soc_info->gpio_type != GPIO_TYPE_TNETV107X)
		return 0;

	ngpio = soc_info->gpio_num;
	if (ngpio == 0) {
		pr_err("GPIO setup:  how many GPIOs?\n");
		return -EINVAL;
	}

	if (WARN_ON(TNETV107X_N_GPIO < ngpio))
		ngpio = TNETV107X_N_GPIO;

	regs = ioremap(soc_info->gpio_base, SZ_4K);
	if (WARN_ON(!regs))
		return -EINVAL;

	for (i = 0, base = 0; base < ngpio; i++, base += 32) {
		ctlr = &chips[i];

		ctlr->chip.label	= "tnetv107x";
		ctlr->chip.can_sleep	= 0;
		ctlr->chip.base		= base;
		ctlr->chip.ngpio	= ngpio - base;
		if (ctlr->chip.ngpio > 32)
			ctlr->chip.ngpio = 32;

		ctlr->chip.request		= tnetv107x_gpio_request;
		ctlr->chip.free			= tnetv107x_gpio_free;
		ctlr->chip.direction_input	= tnetv107x_gpio_dir_in;
		ctlr->chip.get			= tnetv107x_gpio_get;
		ctlr->chip.direction_output	= tnetv107x_gpio_dir_out;
		ctlr->chip.set			= tnetv107x_gpio_set;

		spin_lock_init(&ctlr->lock);

		ctlr->regs	= regs;
		ctlr->set_data	= &regs->data_out[i];
		ctlr->clr_data	= &regs->data_out[i];
		ctlr->in_data	= &regs->data_in[i];

		gpiochip_add(&ctlr->chip);
	}

	soc_info->gpio_ctlrs = chips;
	soc_info->gpio_ctlrs_num = DIV_ROUND_UP(ngpio, 32);
	return 0;
}
pure_initcall(tnetv107x_gpio_setup);
Commit	Line	Data
d92c7962 CC	1	/*
	2	* Texas Instruments TNETV107X GPIO Controller
	3	*
	4	* Copyright (C) 2010 Texas Instruments
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License as
	8	* published by the Free Software Foundation version 2.
	9	*
	10	* This program is distributed "as is" WITHOUT ANY WARRANTY of any
	11	* kind, whether express or implied; without even the implied warranty
	12	* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*/
	15	#include <linux/kernel.h>
	16	#include <linux/init.h>
	17	#include <linux/gpio.h>
	18
	19	#include <mach/common.h>
	20	#include <mach/tnetv107x.h>
	21
	22	struct tnetv107x_gpio_regs {
	23	u32 idver;
	24	u32 data_in[3];
	25	u32 data_out[3];
	26	u32 direction[3];
	27	u32 enable[3];
	28	};
	29
	30	#define gpio_reg_index(gpio) ((gpio) >> 5)
	31	#define gpio_reg_bit(gpio) BIT((gpio) & 0x1f)
	32
	33	#define gpio_reg_rmw(reg, mask, val) \
	34	__raw_writel((__raw_readl(reg) & ~(mask)) \| (val), (reg))
	35
	36	#define gpio_reg_set_bit(reg, gpio) \
	37	gpio_reg_rmw((reg) + gpio_reg_index(gpio), 0, gpio_reg_bit(gpio))
	38
	39	#define gpio_reg_clear_bit(reg, gpio) \
	40	gpio_reg_rmw((reg) + gpio_reg_index(gpio), gpio_reg_bit(gpio), 0)
	41
	42	#define gpio_reg_get_bit(reg, gpio) \
	43	(__raw_readl((reg) + gpio_reg_index(gpio)) & gpio_reg_bit(gpio))
	44
	45	#define chip2controller(chip) \
	46	container_of(chip, struct davinci_gpio_controller, chip)
	47
	48	#define TNETV107X_GPIO_CTLRS DIV_ROUND_UP(TNETV107X_N_GPIO, 32)
	49
	50	static struct davinci_gpio_controller chips[TNETV107X_GPIO_CTLRS];
	51
	52	static int tnetv107x_gpio_request(struct gpio_chip *chip, unsigned offset)
	53	{
	54	struct davinci_gpio_controller *ctlr = chip2controller(chip);
	55	struct tnetv107x_gpio_regs __iomem *regs = ctlr->regs;
	56	unsigned gpio = chip->base + offset;
	57	unsigned long flags;
	58
	59	spin_lock_irqsave(&ctlr->lock, flags);
	60
c284d9fa	61	gpio_reg_set_bit(regs->enable, gpio);
d92c7962 CC	62
	63	spin_unlock_irqrestore(&ctlr->lock, flags);
	64
	65	return 0;
	66	}
	67
	68	static void tnetv107x_gpio_free(struct gpio_chip *chip, unsigned offset)
	69	{
	70	struct davinci_gpio_controller *ctlr = chip2controller(chip);
	71	struct tnetv107x_gpio_regs __iomem *regs = ctlr->regs;
	72	unsigned gpio = chip->base + offset;
	73	unsigned long flags;
	74
	75	spin_lock_irqsave(&ctlr->lock, flags);
	76
c284d9fa	77	gpio_reg_clear_bit(regs->enable, gpio);
d92c7962 CC	78
	79	spin_unlock_irqrestore(&ctlr->lock, flags);
	80	}
	81
	82	static int tnetv107x_gpio_dir_in(struct gpio_chip *chip, unsigned offset)
	83	{
	84	struct davinci_gpio_controller *ctlr = chip2controller(chip);
	85	struct tnetv107x_gpio_regs __iomem *regs = ctlr->regs;
	86	unsigned gpio = chip->base + offset;
	87	unsigned long flags;
	88
	89	spin_lock_irqsave(&ctlr->lock, flags);
	90
c284d9fa	91	gpio_reg_set_bit(regs->direction, gpio);
d92c7962 CC	92
	93	spin_unlock_irqrestore(&ctlr->lock, flags);
	94
	95	return 0;
	96	}
	97
	98	static int tnetv107x_gpio_dir_out(struct gpio_chip *chip,
	99	unsigned offset, int value)
	100	{
	101	struct davinci_gpio_controller *ctlr = chip2controller(chip);
	102	struct tnetv107x_gpio_regs __iomem *regs = ctlr->regs;
	103	unsigned gpio = chip->base + offset;
	104	unsigned long flags;
	105
	106	spin_lock_irqsave(&ctlr->lock, flags);
	107
	108	if (value)
c284d9fa	109	gpio_reg_set_bit(regs->data_out, gpio);
d92c7962	110	else
c284d9fa	111	gpio_reg_clear_bit(regs->data_out, gpio);
d92c7962	112
c284d9fa	113	gpio_reg_clear_bit(regs->direction, gpio);
d92c7962 CC	114
	115	spin_unlock_irqrestore(&ctlr->lock, flags);
	116
	117	return 0;
	118	}
	119
	120	static int tnetv107x_gpio_get(struct gpio_chip *chip, unsigned offset)
	121	{
	122	struct davinci_gpio_controller *ctlr = chip2controller(chip);
	123	struct tnetv107x_gpio_regs __iomem *regs = ctlr->regs;
	124	unsigned gpio = chip->base + offset;
	125	int ret;
	126
c284d9fa	127	ret = gpio_reg_get_bit(regs->data_in, gpio);
d92c7962 CC	128
	129	return ret ? 1 : 0;
	130	}
	131
	132	static void tnetv107x_gpio_set(struct gpio_chip *chip,
	133	unsigned offset, int value)
	134	{
	135	struct davinci_gpio_controller *ctlr = chip2controller(chip);
	136	struct tnetv107x_gpio_regs __iomem *regs = ctlr->regs;
	137	unsigned gpio = chip->base + offset;
	138	unsigned long flags;
	139
	140	spin_lock_irqsave(&ctlr->lock, flags);
	141
	142	if (value)
c284d9fa	143	gpio_reg_set_bit(regs->data_out, gpio);
d92c7962	144	else
c284d9fa	145	gpio_reg_clear_bit(regs->data_out, gpio);
d92c7962 CC	146
	147	spin_unlock_irqrestore(&ctlr->lock, flags);
	148	}
	149
	150	static int __init tnetv107x_gpio_setup(void)
	151	{
	152	int i, base;
	153	unsigned ngpio;
	154	struct davinci_soc_info *soc_info = &davinci_soc_info;
	155	struct tnetv107x_gpio_regs *regs;
	156	struct davinci_gpio_controller *ctlr;
	157
	158	if (soc_info->gpio_type != GPIO_TYPE_TNETV107X)
	159	return 0;
	160
	161	ngpio = soc_info->gpio_num;
	162	if (ngpio == 0) {
	163	pr_err("GPIO setup: how many GPIOs?\n");
	164	return -EINVAL;
	165	}
	166
	167	if (WARN_ON(TNETV107X_N_GPIO < ngpio))
	168	ngpio = TNETV107X_N_GPIO;
	169
	170	regs = ioremap(soc_info->gpio_base, SZ_4K);
	171	if (WARN_ON(!regs))
	172	return -EINVAL;
	173
	174	for (i = 0, base = 0; base < ngpio; i++, base += 32) {
	175	ctlr = &chips[i];
	176
	177	ctlr->chip.label = "tnetv107x";
	178	ctlr->chip.can_sleep = 0;
	179	ctlr->chip.base = base;
	180	ctlr->chip.ngpio = ngpio - base;
	181	if (ctlr->chip.ngpio > 32)
	182	ctlr->chip.ngpio = 32;
	183
	184	ctlr->chip.request = tnetv107x_gpio_request;
	185	ctlr->chip.free = tnetv107x_gpio_free;
	186	ctlr->chip.direction_input = tnetv107x_gpio_dir_in;
	187	ctlr->chip.get = tnetv107x_gpio_get;
	188	ctlr->chip.direction_output = tnetv107x_gpio_dir_out;
	189	ctlr->chip.set = tnetv107x_gpio_set;
	190
	191	spin_lock_init(&ctlr->lock);
	192
	193	ctlr->regs = regs;
	194	ctlr->set_data = &regs->data_out[i];
	195	ctlr->clr_data = &regs->data_out[i];
	196	ctlr->in_data = &regs->data_in[i];
	197
	198	gpiochip_add(&ctlr->chip);
	199	}
	200
	201	soc_info->gpio_ctlrs = chips;
	202	soc_info->gpio_ctlrs_num = DIV_ROUND_UP(ngpio, 32);
	203	return 0;
	204	}
	205	pure_initcall(tnetv107x_gpio_setup);