[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / arm / mach-nomadik / gpio.c

/*
 * Generic GPIO driver for logic cells found in the Nomadik SoC
 *
 * Copyright (C) 2008,2009 STMicroelectronics
 * Copyright (C) 2009 Alessandro Rubini <rubini@unipv.it>
 *   Rewritten based on work by Prafulla WADASKAR <prafulla.wadaskar@st.com>
 *
 * 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.
 */
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/amba/bus.h>
#include <linux/io.h>
#include <linux/gpio.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <linux/irq.h>

#include <mach/hardware.h>
#include <mach/gpio.h>

/*
 * The GPIO module in the Nomadik family of Systems-on-Chip is an
 * AMBA device, managing 32 pins and alternate functions.  The logic block
 * is currently only used in the Nomadik.
 *
 * Symbols in this file are called "nmk_gpio" for "nomadik gpio"
 */

#define NMK_GPIO_PER_CHIP 32
struct nmk_gpio_chip {
	struct gpio_chip chip;
	void __iomem *addr;
	unsigned int parent_irq;
	spinlock_t *lock;
	/* Keep track of configured edges */
	u32 edge_rising;
	u32 edge_falling;
};

/* Mode functions */
int nmk_gpio_set_mode(int gpio, int gpio_mode)
{
	struct nmk_gpio_chip *nmk_chip;
	unsigned long flags;
	u32 afunc, bfunc, bit;

	nmk_chip = get_irq_chip_data(NOMADIK_GPIO_TO_IRQ(gpio));
	if (!nmk_chip)
		return -EINVAL;

	bit = 1 << (gpio - nmk_chip->chip.base);

	spin_lock_irqsave(&nmk_chip->lock, flags);
	afunc = readl(nmk_chip->addr + NMK_GPIO_AFSLA) & ~bit;
	bfunc = readl(nmk_chip->addr + NMK_GPIO_AFSLB) & ~bit;
	if (gpio_mode & NMK_GPIO_ALT_A)
		afunc |= bit;
	if (gpio_mode & NMK_GPIO_ALT_B)
		bfunc |= bit;
	writel(afunc, nmk_chip->addr + NMK_GPIO_AFSLA);
	writel(bfunc, nmk_chip->addr + NMK_GPIO_AFSLB);
	spin_unlock_irqrestore(&nmk_chip->lock, flags);

	return 0;
}
EXPORT_SYMBOL(nmk_gpio_set_mode);

int nmk_gpio_get_mode(int gpio)
{
	struct nmk_gpio_chip *nmk_chip;
	u32 afunc, bfunc, bit;

	nmk_chip = get_irq_chip_data(NOMADIK_GPIO_TO_IRQ(gpio));
	if (!nmk_chip)
		return -EINVAL;

	bit = 1 << (gpio - nmk_chip->chip.base);

	afunc = readl(nmk_chip->addr + NMK_GPIO_AFSLA) & bit;
	bfunc = readl(nmk_chip->addr + NMK_GPIO_AFSLB) & bit;

	return (afunc ? NMK_GPIO_ALT_A : 0) | (bfunc ? NMK_GPIO_ALT_B : 0);
}
EXPORT_SYMBOL(nmk_gpio_get_mode);


/* IRQ functions */
static inline int nmk_gpio_get_bitmask(int gpio)
{
	return 1 << (gpio % 32);
}

static void nmk_gpio_irq_ack(unsigned int irq)
{
	int gpio;
	struct nmk_gpio_chip *nmk_chip;

	gpio = NOMADIK_IRQ_TO_GPIO(irq);
	nmk_chip = get_irq_chip_data(irq);
	if (!nmk_chip)
		return;
	writel(nmk_gpio_get_bitmask(gpio), nmk_chip->addr + NMK_GPIO_IC);
}

static void nmk_gpio_irq_mask(unsigned int irq)
{
	int gpio;
	struct nmk_gpio_chip *nmk_chip;
	unsigned long flags;
	u32 bitmask, reg;

	gpio = NOMADIK_IRQ_TO_GPIO(irq);
	nmk_chip = get_irq_chip_data(irq);
	bitmask = nmk_gpio_get_bitmask(gpio);
	if (!nmk_chip)
		return;

	/* we must individually clear the two edges */
	spin_lock_irqsave(&nmk_chip->lock, flags);
	if (nmk_chip->edge_rising & bitmask) {
		reg = readl(nmk_chip->addr + NMK_GPIO_RWIMSC);
		reg &= ~bitmask;
		writel(reg, nmk_chip->addr + NMK_GPIO_RWIMSC);
	}
	if (nmk_chip->edge_falling & bitmask) {
		reg = readl(nmk_chip->addr + NMK_GPIO_FWIMSC);
		reg &= ~bitmask;
		writel(reg, nmk_chip->addr + NMK_GPIO_FWIMSC);
	}
	spin_unlock_irqrestore(&nmk_chip->lock, flags);
};

static void nmk_gpio_irq_unmask(unsigned int irq)
{
	int gpio;
	struct nmk_gpio_chip *nmk_chip;
	unsigned long flags;
	u32 bitmask, reg;

	gpio = NOMADIK_IRQ_TO_GPIO(irq);
	nmk_chip = get_irq_chip_data(irq);
	bitmask = nmk_gpio_get_bitmask(gpio);
	if (!nmk_chip)
		return;

	/* we must individually set the two edges */
	spin_lock_irqsave(&nmk_chip->lock, flags);
	if (nmk_chip->edge_rising & bitmask) {
		reg = readl(nmk_chip->addr + NMK_GPIO_RWIMSC);
		reg |= bitmask;
		writel(reg, nmk_chip->addr + NMK_GPIO_RWIMSC);
	}
	if (nmk_chip->edge_falling & bitmask) {
		reg = readl(nmk_chip->addr + NMK_GPIO_FWIMSC);
		reg |= bitmask;
		writel(reg, nmk_chip->addr + NMK_GPIO_FWIMSC);
	}
	spin_unlock_irqrestore(&nmk_chip->lock, flags);
}

static int nmk_gpio_irq_set_type(unsigned int irq, unsigned int type)
{
	int gpio;
	struct nmk_gpio_chip *nmk_chip;
	unsigned long flags;
	u32 bitmask;

	gpio = NOMADIK_IRQ_TO_GPIO(irq);
	nmk_chip = get_irq_chip_data(irq);
	bitmask = nmk_gpio_get_bitmask(gpio);
	if (!nmk_chip)
		return -EINVAL;

	if (type & IRQ_TYPE_LEVEL_HIGH)
		return -EINVAL;
	if (type & IRQ_TYPE_LEVEL_LOW)
		return -EINVAL;

	spin_lock_irqsave(&nmk_chip->lock, flags);

	nmk_chip->edge_rising &= ~bitmask;
	if (type & IRQ_TYPE_EDGE_RISING)
		nmk_chip->edge_rising |= bitmask;
	writel(nmk_chip->edge_rising, nmk_chip->addr + NMK_GPIO_RIMSC);

	nmk_chip->edge_falling &= ~bitmask;
	if (type & IRQ_TYPE_EDGE_FALLING)
		nmk_chip->edge_falling |= bitmask;
	writel(nmk_chip->edge_falling, nmk_chip->addr + NMK_GPIO_FIMSC);

	spin_unlock_irqrestore(&nmk_chip->lock, flags);

	nmk_gpio_irq_unmask(irq);

	return 0;
}

static struct irq_chip nmk_gpio_irq_chip = {
	.name		= "Nomadik-GPIO",
	.ack		= nmk_gpio_irq_ack,
	.mask		= nmk_gpio_irq_mask,
	.unmask		= nmk_gpio_irq_unmask,
	.set_type	= nmk_gpio_irq_set_type,
};

static void nmk_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
{
	struct nmk_gpio_chip *nmk_chip;
	struct irq_chip *host_chip;
	unsigned int gpio_irq;
	u32 pending;
	unsigned int first_irq;

	nmk_chip = get_irq_data(irq);
	first_irq = NOMADIK_GPIO_TO_IRQ(nmk_chip->chip.base);
	while ( (pending = readl(nmk_chip->addr + NMK_GPIO_IS)) ) {
		gpio_irq = first_irq + __ffs(pending);
		generic_handle_irq(gpio_irq);
	}
	if (0) {/* don't ack parent irq, as ack == disable */
		host_chip = get_irq_chip(irq);
		host_chip->ack(irq);
	}
}

static int nmk_gpio_init_irq(struct nmk_gpio_chip *nmk_chip)
{
	unsigned int first_irq;
	int i;

	first_irq = NOMADIK_GPIO_TO_IRQ(nmk_chip->chip.base);
	for (i = first_irq; i < first_irq + NMK_GPIO_PER_CHIP; i++) {
		set_irq_chip(i, &nmk_gpio_irq_chip);
		set_irq_handler(i, handle_edge_irq);
		set_irq_flags(i, IRQF_VALID);
		set_irq_chip_data(i, nmk_chip);
	}
	set_irq_chained_handler(nmk_chip->parent_irq, nmk_gpio_irq_handler);
	set_irq_data(nmk_chip->parent_irq, nmk_chip);
	return 0;
}

/* I/O Functions */
static int nmk_gpio_make_input(struct gpio_chip *chip, unsigned offset)
{
	struct nmk_gpio_chip *nmk_chip =
		container_of(chip, struct nmk_gpio_chip, chip);

	writel(1 << offset, nmk_chip->addr + NMK_GPIO_DIRC);
	return 0;
}

static int nmk_gpio_make_output(struct gpio_chip *chip, unsigned offset,
				int val)
{
	struct nmk_gpio_chip *nmk_chip =
		container_of(chip, struct nmk_gpio_chip, chip);

	writel(1 << offset, nmk_chip->addr + NMK_GPIO_DIRS);
	return 0;
}

static int nmk_gpio_get_input(struct gpio_chip *chip, unsigned offset)
{
	struct nmk_gpio_chip *nmk_chip =
		container_of(chip, struct nmk_gpio_chip, chip);
	u32 bit = 1 << offset;

	return (readl(nmk_chip->addr + NMK_GPIO_DAT) & bit) != 0;
}

static void nmk_gpio_set_output(struct gpio_chip *chip, unsigned offset,
				int val)
{
	struct nmk_gpio_chip *nmk_chip =
		container_of(chip, struct nmk_gpio_chip, chip);
	u32 bit = 1 << offset;

	if (val)
		writel(bit, nmk_chip->addr + NMK_GPIO_DATS);
	else
		writel(bit, nmk_chip->addr + NMK_GPIO_DATC);
}

/* This structure is replicated for each GPIO block allocated at probe time */
static struct gpio_chip nmk_gpio_template = {
	.direction_input	= nmk_gpio_make_input,
	.get			= nmk_gpio_get_input,
	.direction_output	= nmk_gpio_make_output,
	.set			= nmk_gpio_set_output,
	.ngpio			= NMK_GPIO_PER_CHIP,
	.can_sleep		= 0,
};

static int __init nmk_gpio_probe(struct amba_device *dev, struct amba_id *id)
{
	struct nmk_gpio_platform_data *pdata;
	struct nmk_gpio_chip *nmk_chip;
	struct gpio_chip *chip;
	int ret;

	pdata = dev->dev.platform_data;
	ret = amba_request_regions(dev, pdata->name);
	if (ret)
		return ret;

	nmk_chip = kzalloc(sizeof(*nmk_chip), GFP_KERNEL);
	if (!nmk_chip) {
		ret = -ENOMEM;
		goto out_amba;
	}
	/*
	 * The virt address in nmk_chip->addr is in the nomadik register space,
	 * so we can simply convert the resource address, without remapping
	 */
	nmk_chip->addr = io_p2v(dev->res.start);
	nmk_chip->chip = nmk_gpio_template;
	nmk_chip->parent_irq = pdata->parent_irq;

	chip = &nmk_chip->chip;
	chip->base = pdata->first_gpio;
	chip->label = pdata->name;
	chip->dev = &dev->dev;
	chip->owner = THIS_MODULE;

	ret = gpiochip_add(&nmk_chip->chip);
	if (ret)
		goto out_free;

	amba_set_drvdata(dev, nmk_chip);

	nmk_gpio_init_irq(nmk_chip);

	dev_info(&dev->dev, "Bits %i-%i at address %p\n",
		 nmk_chip->chip.base, nmk_chip->chip.base+31, nmk_chip->addr);
	return 0;

 out_free:
	kfree(nmk_chip);
 out_amba:
	amba_release_regions(dev);
	dev_err(&dev->dev, "Failure %i for GPIO %i-%i\n", ret,
		  pdata->first_gpio, pdata->first_gpio+31);
	return ret;
}

static int nmk_gpio_remove(struct amba_device *dev)
{
	struct nmk_gpio_chip *nmk_chip;

	nmk_chip = amba_get_drvdata(dev);
	gpiochip_remove(&nmk_chip->chip);
	kfree(nmk_chip);
	amba_release_regions(dev);
	return 0;
}


/* We have 0x1f080060 and 0x1f180060, accept both using the mask */
static struct amba_id nmk_gpio_ids[] = {
	{
		.id	= 0x1f080060,
		.mask	= 0xffefffff,
	},
	{0, 0},
};

static struct amba_driver nmk_gpio_driver = {
	.drv = {
		.owner = THIS_MODULE,
		.name = "gpio",
		},
	.probe = nmk_gpio_probe,
	.remove = nmk_gpio_remove,
	.suspend = NULL, /* to be done */
	.resume = NULL,
	.id_table = nmk_gpio_ids,
};

static int __init nmk_gpio_init(void)
{
	return amba_driver_register(&nmk_gpio_driver);
}

arch_initcall(nmk_gpio_init);

MODULE_AUTHOR("Prafulla WADASKAR and Alessandro Rubini");
MODULE_DESCRIPTION("Nomadik GPIO Driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
2ec1d359 AR	1	/*
	2	* Generic GPIO driver for logic cells found in the Nomadik SoC
	3	*
	4	* Copyright (C) 2008,2009 STMicroelectronics
	5	* Copyright (C) 2009 Alessandro Rubini <rubini@unipv.it>
	6	* Rewritten based on work by Prafulla WADASKAR <prafulla.wadaskar@st.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License version 2 as
	10	* published by the Free Software Foundation.
	11	*/
	12	#include <linux/kernel.h>
	13	#include <linux/module.h>
	14	#include <linux/init.h>
	15	#include <linux/device.h>
	16	#include <linux/amba/bus.h>
	17	#include <linux/io.h>
	18	#include <linux/gpio.h>
	19	#include <linux/spinlock.h>
	20	#include <linux/interrupt.h>
	21	#include <linux/irq.h>
	22
	23	#include <mach/hardware.h>
	24	#include <mach/gpio.h>
	25
	26	/*
	27	* The GPIO module in the Nomadik family of Systems-on-Chip is an
	28	* AMBA device, managing 32 pins and alternate functions. The logic block
	29	* is currently only used in the Nomadik.
	30	*
	31	* Symbols in this file are called "nmk_gpio" for "nomadik gpio"
	32	*/
	33
	34	#define NMK_GPIO_PER_CHIP 32
	35	struct nmk_gpio_chip {
	36	struct gpio_chip chip;
	37	void __iomem *addr;
	38	unsigned int parent_irq;
	39	spinlock_t *lock;
	40	/* Keep track of configured edges */
	41	u32 edge_rising;
	42	u32 edge_falling;
	43	};
	44
	45	/* Mode functions */
	46	int nmk_gpio_set_mode(int gpio, int gpio_mode)
	47	{
	48	struct nmk_gpio_chip *nmk_chip;
	49	unsigned long flags;
	50	u32 afunc, bfunc, bit;
	51
	52	nmk_chip = get_irq_chip_data(NOMADIK_GPIO_TO_IRQ(gpio));
	53	if (!nmk_chip)
	54	return -EINVAL;
	55
	56	bit = 1 << (gpio - nmk_chip->chip.base);
	57
	58	spin_lock_irqsave(&nmk_chip->lock, flags);
	59	afunc = readl(nmk_chip->addr + NMK_GPIO_AFSLA) & ~bit;
	60	bfunc = readl(nmk_chip->addr + NMK_GPIO_AFSLB) & ~bit;
	61	if (gpio_mode & NMK_GPIO_ALT_A)
	62	afunc \|= bit;
	63	if (gpio_mode & NMK_GPIO_ALT_B)
	64	bfunc \|= bit;
65	writel(afunc, nmk_chip->addr + NMK_GPIO_AFSLA);
66	writel(bfunc, nmk_chip->addr + NMK_GPIO_AFSLB);
67	spin_unlock_irqrestore(&nmk_chip->lock, flags);
68
69	return 0;
70	}
71	EXPORT_SYMBOL(nmk_gpio_set_mode);
72
73	int nmk_gpio_get_mode(int gpio)
74	{
75	struct nmk_gpio_chip *nmk_chip;
76	u32 afunc, bfunc, bit;
77
78	nmk_chip = get_irq_chip_data(NOMADIK_GPIO_TO_IRQ(gpio));
79	if (!nmk_chip)
80	return -EINVAL;
81
82	bit = 1 << (gpio - nmk_chip->chip.base);
83
84	afunc = readl(nmk_chip->addr + NMK_GPIO_AFSLA) & bit;
85	bfunc = readl(nmk_chip->addr + NMK_GPIO_AFSLB) & bit;
86
87	return (afunc ? NMK_GPIO_ALT_A : 0) \| (bfunc ? NMK_GPIO_ALT_B : 0);
88	}
89	EXPORT_SYMBOL(nmk_gpio_get_mode);
90
91
92	/* IRQ functions */
93	static inline int nmk_gpio_get_bitmask(int gpio)
94	{
95	return 1 << (gpio % 32);
96	}
97
98	static void nmk_gpio_irq_ack(unsigned int irq)
99	{
100	int gpio;
101	struct nmk_gpio_chip *nmk_chip;
102
103	gpio = NOMADIK_IRQ_TO_GPIO(irq);
104	nmk_chip = get_irq_chip_data(irq);
105	if (!nmk_chip)
106	return;
107	writel(nmk_gpio_get_bitmask(gpio), nmk_chip->addr + NMK_GPIO_IC);
108	}
109
110	static void nmk_gpio_irq_mask(unsigned int irq)
111	{
112	int gpio;
113	struct nmk_gpio_chip *nmk_chip;
114	unsigned long flags;
115	u32 bitmask, reg;
116
117	gpio = NOMADIK_IRQ_TO_GPIO(irq);
118	nmk_chip = get_irq_chip_data(irq);
119	bitmask = nmk_gpio_get_bitmask(gpio);
120	if (!nmk_chip)
121	return;
122
123	/* we must individually clear the two edges */
124	spin_lock_irqsave(&nmk_chip->lock, flags);
125	if (nmk_chip->edge_rising & bitmask) {
126	reg = readl(nmk_chip->addr + NMK_GPIO_RWIMSC);
127	reg &= ~bitmask;
128	writel(reg, nmk_chip->addr + NMK_GPIO_RWIMSC);
129	}
130	if (nmk_chip->edge_falling & bitmask) {
131	reg = readl(nmk_chip->addr + NMK_GPIO_FWIMSC);
132	reg &= ~bitmask;
133	writel(reg, nmk_chip->addr + NMK_GPIO_FWIMSC);
134	}
135	spin_unlock_irqrestore(&nmk_chip->lock, flags);
136	};
137
138	static void nmk_gpio_irq_unmask(unsigned int irq)
139	{
140	int gpio;
141	struct nmk_gpio_chip *nmk_chip;
142	unsigned long flags;
143	u32 bitmask, reg;
144
145	gpio = NOMADIK_IRQ_TO_GPIO(irq);
146	nmk_chip = get_irq_chip_data(irq);
147	bitmask = nmk_gpio_get_bitmask(gpio);
148	if (!nmk_chip)
149	return;
150
151	/* we must individually set the two edges */
152	spin_lock_irqsave(&nmk_chip->lock, flags);
153	if (nmk_chip->edge_rising & bitmask) {
154	reg = readl(nmk_chip->addr + NMK_GPIO_RWIMSC);
155	reg \|= bitmask;
156	writel(reg, nmk_chip->addr + NMK_GPIO_RWIMSC);
157	}
158	if (nmk_chip->edge_falling & bitmask) {
159	reg = readl(nmk_chip->addr + NMK_GPIO_FWIMSC);
160	reg \|= bitmask;
161	writel(reg, nmk_chip->addr + NMK_GPIO_FWIMSC);
162	}
163	spin_unlock_irqrestore(&nmk_chip->lock, flags);
164	}
165
166	static int nmk_gpio_irq_set_type(unsigned int irq, unsigned int type)
167	{
168	int gpio;
169	struct nmk_gpio_chip *nmk_chip;
170	unsigned long flags;
171	u32 bitmask;
172
173	gpio = NOMADIK_IRQ_TO_GPIO(irq);
174	nmk_chip = get_irq_chip_data(irq);
175	bitmask = nmk_gpio_get_bitmask(gpio);
176	if (!nmk_chip)
177	return -EINVAL;
178
179	if (type & IRQ_TYPE_LEVEL_HIGH)
180	return -EINVAL;
181	if (type & IRQ_TYPE_LEVEL_LOW)
182	return -EINVAL;
183
184	spin_lock_irqsave(&nmk_chip->lock, flags);
185
186	nmk_chip->edge_rising &= ~bitmask;
187	if (type & IRQ_TYPE_EDGE_RISING)
188	nmk_chip->edge_rising \|= bitmask;
189	writel(nmk_chip->edge_rising, nmk_chip->addr + NMK_GPIO_RIMSC);
190
191	nmk_chip->edge_falling &= ~bitmask;
192	if (type & IRQ_TYPE_EDGE_FALLING)
193	nmk_chip->edge_falling \|= bitmask;
194	writel(nmk_chip->edge_falling, nmk_chip->addr + NMK_GPIO_FIMSC);
195
196	spin_unlock_irqrestore(&nmk_chip->lock, flags);
197
198	nmk_gpio_irq_unmask(irq);
199
200	return 0;
201	}
202
203	static struct irq_chip nmk_gpio_irq_chip = {
204	.name = "Nomadik-GPIO",
205	.ack = nmk_gpio_irq_ack,
206	.mask = nmk_gpio_irq_mask,
207	.unmask = nmk_gpio_irq_unmask,
208	.set_type = nmk_gpio_irq_set_type,
209	};
210
211	static void nmk_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
212	{
213	struct nmk_gpio_chip *nmk_chip;
214	struct irq_chip *host_chip;
215	unsigned int gpio_irq;
216	u32 pending;
217	unsigned int first_irq;
218
219	nmk_chip = get_irq_data(irq);
220	first_irq = NOMADIK_GPIO_TO_IRQ(nmk_chip->chip.base);
221	while ( (pending = readl(nmk_chip->addr + NMK_GPIO_IS)) ) {
222	gpio_irq = first_irq + __ffs(pending);
223	generic_handle_irq(gpio_irq);
224	}
225	if (0) {/* don't ack parent irq, as ack == disable */
226	host_chip = get_irq_chip(irq);
227	host_chip->ack(irq);
228	}
229	}
230
231	static int nmk_gpio_init_irq(struct nmk_gpio_chip *nmk_chip)
232	{
233	unsigned int first_irq;
234	int i;
235
236	first_irq = NOMADIK_GPIO_TO_IRQ(nmk_chip->chip.base);
237	for (i = first_irq; i < first_irq + NMK_GPIO_PER_CHIP; i++) {
238	set_irq_chip(i, &nmk_gpio_irq_chip);
239	set_irq_handler(i, handle_edge_irq);
240	set_irq_flags(i, IRQF_VALID);
241	set_irq_chip_data(i, nmk_chip);
242	}
243	set_irq_chained_handler(nmk_chip->parent_irq, nmk_gpio_irq_handler);
244	set_irq_data(nmk_chip->parent_irq, nmk_chip);
245	return 0;
246	}
247
248	/* I/O Functions */
249	static int nmk_gpio_make_input(struct gpio_chip *chip, unsigned offset)
250	{
251	struct nmk_gpio_chip *nmk_chip =
252	container_of(chip, struct nmk_gpio_chip, chip);
253
254	writel(1 << offset, nmk_chip->addr + NMK_GPIO_DIRC);
255	return 0;
256	}
257
258	static int nmk_gpio_make_output(struct gpio_chip *chip, unsigned offset,
259	int val)
260	{
261	struct nmk_gpio_chip *nmk_chip =
262	container_of(chip, struct nmk_gpio_chip, chip);
263
264	writel(1 << offset, nmk_chip->addr + NMK_GPIO_DIRS);
265	return 0;
266	}
267
268	static int nmk_gpio_get_input(struct gpio_chip *chip, unsigned offset)
269	{
270	struct nmk_gpio_chip *nmk_chip =
271	container_of(chip, struct nmk_gpio_chip, chip);
272	u32 bit = 1 << offset;
273
274	return (readl(nmk_chip->addr + NMK_GPIO_DAT) & bit) != 0;
275	}
276
277	static void nmk_gpio_set_output(struct gpio_chip *chip, unsigned offset,
278	int val)
279	{
280	struct nmk_gpio_chip *nmk_chip =
281	container_of(chip, struct nmk_gpio_chip, chip);
282	u32 bit = 1 << offset;
283
284	if (val)
285	writel(bit, nmk_chip->addr + NMK_GPIO_DATS);
286	else
287	writel(bit, nmk_chip->addr + NMK_GPIO_DATC);
288	}
289
290	/* This structure is replicated for each GPIO block allocated at probe time */
291	static struct gpio_chip nmk_gpio_template = {
292	.direction_input = nmk_gpio_make_input,
293	.get = nmk_gpio_get_input,
294	.direction_output = nmk_gpio_make_output,
295	.set = nmk_gpio_set_output,
296	.ngpio = NMK_GPIO_PER_CHIP,
297	.can_sleep = 0,
298	};
299
300	static int __init nmk_gpio_probe(struct amba_device dev, struct amba_id id)
301	{
302	struct nmk_gpio_platform_data *pdata;
303	struct nmk_gpio_chip *nmk_chip;
304	struct gpio_chip *chip;
305	int ret;
306
307	pdata = dev->dev.platform_data;
308	ret = amba_request_regions(dev, pdata->name);
309	if (ret)
310	return ret;
311
312	nmk_chip = kzalloc(sizeof(*nmk_chip), GFP_KERNEL);
313	if (!nmk_chip) {
314	ret = -ENOMEM;
315	goto out_amba;
316	}
317	/*
318	* The virt address in nmk_chip->addr is in the nomadik register space,
319	* so we can simply convert the resource address, without remapping
320	*/
321	nmk_chip->addr = io_p2v(dev->res.start);
322	nmk_chip->chip = nmk_gpio_template;
323	nmk_chip->parent_irq = pdata->parent_irq;
324
325	chip = &nmk_chip->chip;
326	chip->base = pdata->first_gpio;
327	chip->label = pdata->name;
328	chip->dev = &dev->dev;
329	chip->owner = THIS_MODULE;
330
331	ret = gpiochip_add(&nmk_chip->chip);
332	if (ret)
333	goto out_free;
334
335	amba_set_drvdata(dev, nmk_chip);
336
337	nmk_gpio_init_irq(nmk_chip);
338
339	dev_info(&dev->dev, "Bits %i-%i at address %p\n",
340	nmk_chip->chip.base, nmk_chip->chip.base+31, nmk_chip->addr);
341	return 0;
342
343	out_free:
344	kfree(nmk_chip);
345	out_amba:
346	amba_release_regions(dev);
347	dev_err(&dev->dev, "Failure %i for GPIO %i-%i\n", ret,
348	pdata->first_gpio, pdata->first_gpio+31);
349	return ret;
350	}
351
352	static int nmk_gpio_remove(struct amba_device *dev)
353	{
354	struct nmk_gpio_chip *nmk_chip;
355
356	nmk_chip = amba_get_drvdata(dev);
357	gpiochip_remove(&nmk_chip->chip);
358	kfree(nmk_chip);
359	amba_release_regions(dev);
360	return 0;
361	}
362
363
364	/* We have 0x1f080060 and 0x1f180060, accept both using the mask */
365	static struct amba_id nmk_gpio_ids[] = {
366	{
367	.id = 0x1f080060,
368	.mask = 0xffefffff,
369	},
370	{0, 0},
371	};
372
373	static struct amba_driver nmk_gpio_driver = {
374	.drv = {
375	.owner = THIS_MODULE,
376	.name = "gpio",
377	},
378	.probe = nmk_gpio_probe,
379	.remove = nmk_gpio_remove,
380	.suspend = NULL, /* to be done */
381	.resume = NULL,
382	.id_table = nmk_gpio_ids,
383	};
384
385	static int __init nmk_gpio_init(void)
386	{
387	return amba_driver_register(&nmk_gpio_driver);
388	}
389
390	arch_initcall(nmk_gpio_init);
391
392	MODULE_AUTHOR("Prafulla WADASKAR and Alessandro Rubini");
393	MODULE_DESCRIPTION("Nomadik GPIO Driver");
394	MODULE_LICENSE("GPL");
395
396