[linux-2.6-block.git] / drivers / gpio / langwell_gpio.c

/* langwell_gpio.c Moorestown platform Langwell chip GPIO driver
 * Copyright (c) 2008 - 2009,  Intel Corporation.
 *
 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/* Supports:
 * Moorestown platform Langwell chip.
 */

#include <linux/module.h>
#include <linux/pci.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/stddef.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <linux/gpio.h>

struct lnw_gpio_register {
	u32	GPLR[2];
	u32	GPDR[2];
	u32	GPSR[2];
	u32	GPCR[2];
	u32	GRER[2];
	u32	GFER[2];
	u32	GEDR[2];
};

struct lnw_gpio {
	struct gpio_chip		chip;
	struct lnw_gpio_register 	*reg_base;
	spinlock_t			lock;
	unsigned			irq_base;
};

static int lnw_gpio_get(struct gpio_chip *chip, unsigned offset)
{
	struct lnw_gpio *lnw = container_of(chip, struct lnw_gpio, chip);
	u8 reg = offset / 32;
	void __iomem *gplr;

	gplr = (void __iomem *)(&lnw->reg_base->GPLR[reg]);
	return readl(gplr) & BIT(offset % 32);
}

static void lnw_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
{
	struct lnw_gpio *lnw = container_of(chip, struct lnw_gpio, chip);
	u8 reg = offset / 32;
	void __iomem *gpsr, *gpcr;

	if (value) {
		gpsr = (void __iomem *)(&lnw->reg_base->GPSR[reg]);
		writel(BIT(offset % 32), gpsr);
	} else {
		gpcr = (void __iomem *)(&lnw->reg_base->GPCR[reg]);
		writel(BIT(offset % 32), gpcr);
	}
}

static int lnw_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
{
	struct lnw_gpio *lnw = container_of(chip, struct lnw_gpio, chip);
	u8 reg = offset / 32;
	u32 value;
	unsigned long flags;
	void __iomem *gpdr;

	gpdr = (void __iomem *)(&lnw->reg_base->GPDR[reg]);
	spin_lock_irqsave(&lnw->lock, flags);
	value = readl(gpdr);
	value &= ~BIT(offset % 32);
	writel(value, gpdr);
	spin_unlock_irqrestore(&lnw->lock, flags);
	return 0;
}

static int lnw_gpio_direction_output(struct gpio_chip *chip,
			unsigned offset, int value)
{
	struct lnw_gpio *lnw = container_of(chip, struct lnw_gpio, chip);
	u8 reg = offset / 32;
	unsigned long flags;
	void __iomem *gpdr;

	lnw_gpio_set(chip, offset, value);
	gpdr = (void __iomem *)(&lnw->reg_base->GPDR[reg]);
	spin_lock_irqsave(&lnw->lock, flags);
	value = readl(gpdr);
	value |= BIT(offset % 32);;
	writel(value, gpdr);
	spin_unlock_irqrestore(&lnw->lock, flags);
	return 0;
}

static int lnw_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
{
	struct lnw_gpio *lnw = container_of(chip, struct lnw_gpio, chip);
	return lnw->irq_base + offset;
}

static int lnw_irq_type(unsigned irq, unsigned type)
{
	struct lnw_gpio *lnw = get_irq_chip_data(irq);
	u32 gpio = irq - lnw->irq_base;
	u8 reg = gpio / 32;
	unsigned long flags;
	u32 value;
	void __iomem *grer = (void __iomem *)(&lnw->reg_base->GRER[reg]);
	void __iomem *gfer = (void __iomem *)(&lnw->reg_base->GFER[reg]);

	if (gpio < 0 || gpio > lnw->chip.ngpio)
		return -EINVAL;
	spin_lock_irqsave(&lnw->lock, flags);
	if (type & IRQ_TYPE_EDGE_RISING)
		value = readl(grer) | BIT(gpio % 32);
	else
		value = readl(grer) & (~BIT(gpio % 32));
	writel(value, grer);

	if (type & IRQ_TYPE_EDGE_FALLING)
		value = readl(gfer) | BIT(gpio % 32);
	else
		value = readl(gfer) & (~BIT(gpio % 32));
	writel(value, gfer);
	spin_unlock_irqrestore(&lnw->lock, flags);

	return 0;
};

static void lnw_irq_unmask(unsigned irq)
{
	struct lnw_gpio *lnw = get_irq_chip_data(irq);
	u32 gpio = irq - lnw->irq_base;
	u8 reg = gpio / 32;
	void __iomem *gedr;

	gedr = (void __iomem *)(&lnw->reg_base->GEDR[reg]);
	writel(BIT(gpio % 32), gedr);
};

static void lnw_irq_mask(unsigned irq)
{
};

static struct irq_chip lnw_irqchip = {
	.name		= "LNW-GPIO",
	.mask		= lnw_irq_mask,
	.unmask		= lnw_irq_unmask,
	.set_type	= lnw_irq_type,
};

static struct pci_device_id lnw_gpio_ids[] = {
	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x080f) },
	{ 0, }
};
MODULE_DEVICE_TABLE(pci, lnw_gpio_ids);

static void lnw_irq_handler(unsigned irq, struct irq_desc *desc)
{
	struct lnw_gpio *lnw = (struct lnw_gpio *)get_irq_data(irq);
	u32 reg, gpio;
	void __iomem *gedr;
	u32 gedr_v;

	/* check GPIO controller to check which pin triggered the interrupt */
	for (reg = 0; reg < lnw->chip.ngpio / 32; reg++) {
		gedr = (void __iomem *)(&lnw->reg_base->GEDR[reg]);
		gedr_v = readl(gedr);
		if (!gedr_v)
			continue;
		for (gpio = reg*32; gpio < reg*32+32; gpio++) {
			gedr_v = readl(gedr);
			if (gedr_v & BIT(gpio % 32)) {
				pr_debug("pin %d triggered\n", gpio);
				generic_handle_irq(lnw->irq_base + gpio);
			}
		}
		/* clear the edge detect status bit */
		writel(gedr_v, gedr);
	}
	desc->chip->eoi(irq);
}

static int __devinit lnw_gpio_probe(struct pci_dev *pdev,
			const struct pci_device_id *id)
{
	void *base;
	int i;
	resource_size_t start, len;
	struct lnw_gpio *lnw;
	u32 irq_base;
	u32 gpio_base;
	int retval = 0;

	retval = pci_enable_device(pdev);
	if (retval)
		goto done;

	retval = pci_request_regions(pdev, "langwell_gpio");
	if (retval) {
		dev_err(&pdev->dev, "error requesting resources\n");
		goto err2;
	}
	/* get the irq_base from bar1 */
	start = pci_resource_start(pdev, 1);
	len = pci_resource_len(pdev, 1);
	base = ioremap_nocache(start, len);
	if (!base) {
		dev_err(&pdev->dev, "error mapping bar1\n");
		goto err3;
	}
	irq_base = *(u32 *)base;
	gpio_base = *((u32 *)base + 1);
	/* release the IO mapping, since we already get the info from bar1 */
	iounmap(base);
	/* get the register base from bar0 */
	start = pci_resource_start(pdev, 0);
	len = pci_resource_len(pdev, 0);
	base = ioremap_nocache(start, len);
	if (!base) {
		dev_err(&pdev->dev, "error mapping bar0\n");
		retval = -EFAULT;
		goto err3;
	}

	lnw = kzalloc(sizeof(struct lnw_gpio), GFP_KERNEL);
	if (!lnw) {
		dev_err(&pdev->dev, "can't allocate langwell_gpio chip data\n");
		retval = -ENOMEM;
		goto err4;
	}
	lnw->reg_base = base;
	lnw->irq_base = irq_base;
	lnw->chip.label = dev_name(&pdev->dev);
	lnw->chip.direction_input = lnw_gpio_direction_input;
	lnw->chip.direction_output = lnw_gpio_direction_output;
	lnw->chip.get = lnw_gpio_get;
	lnw->chip.set = lnw_gpio_set;
	lnw->chip.to_irq = lnw_gpio_to_irq;
	lnw->chip.base = gpio_base;
	lnw->chip.ngpio = 64;
	lnw->chip.can_sleep = 0;
	pci_set_drvdata(pdev, lnw);
	retval = gpiochip_add(&lnw->chip);
	if (retval) {
		dev_err(&pdev->dev, "langwell gpiochip_add error %d\n", retval);
		goto err5;
	}
	set_irq_data(pdev->irq, lnw);
	set_irq_chained_handler(pdev->irq, lnw_irq_handler);
	for (i = 0; i < lnw->chip.ngpio; i++) {
		set_irq_chip_and_handler_name(i + lnw->irq_base, &lnw_irqchip,
					handle_simple_irq, "demux");
		set_irq_chip_data(i + lnw->irq_base, lnw);
	}

	spin_lock_init(&lnw->lock);
	goto done;
err5:
	kfree(lnw);
err4:
	iounmap(base);
err3:
	pci_release_regions(pdev);
err2:
	pci_disable_device(pdev);
done:
	return retval;
}

static struct pci_driver lnw_gpio_driver = {
	.name		= "langwell_gpio",
	.id_table	= lnw_gpio_ids,
	.probe		= lnw_gpio_probe,
};

static int __init lnw_gpio_init(void)
{
	return pci_register_driver(&lnw_gpio_driver);
}

device_initcall(lnw_gpio_init);
Commit	Line	Data
8bf02617 AD	1	/* langwell_gpio.c Moorestown platform Langwell chip GPIO driver
	2	* Copyright (c) 2008 - 2009, Intel Corporation.
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License version 2 as
	6	* published by the Free Software Foundation.
	7	*
	8	* This program is distributed in the hope that it will be useful,
	9	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	10	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	11	* GNU General Public License for more details.
	12	*
	13	* You should have received a copy of the GNU General Public License
	14	* along with this program; if not, write to the Free Software
	15	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	16	*/
	17
	18	/* Supports:
	19	* Moorestown platform Langwell chip.
	20	*/
	21
	22	#include <linux/module.h>
	23	#include <linux/pci.h>
	24	#include <linux/kernel.h>
	25	#include <linux/delay.h>
	26	#include <linux/stddef.h>
	27	#include <linux/interrupt.h>
	28	#include <linux/init.h>
	29	#include <linux/irq.h>
	30	#include <linux/io.h>
	31	#include <linux/gpio.h>
	32
	33	struct lnw_gpio_register {
	34	u32 GPLR[2];
	35	u32 GPDR[2];
	36	u32 GPSR[2];
	37	u32 GPCR[2];
	38	u32 GRER[2];
	39	u32 GFER[2];
	40	u32 GEDR[2];
	41	};
	42
	43	struct lnw_gpio {
	44	struct gpio_chip chip;
	45	struct lnw_gpio_register *reg_base;
	46	spinlock_t lock;
	47	unsigned irq_base;
	48	};
	49
	50	static int lnw_gpio_get(struct gpio_chip *chip, unsigned offset)
	51	{
	52	struct lnw_gpio *lnw = container_of(chip, struct lnw_gpio, chip);
	53	u8 reg = offset / 32;
	54	void __iomem *gplr;
	55
	56	gplr = (void __iomem *)(&lnw->reg_base->GPLR[reg]);
	57	return readl(gplr) & BIT(offset % 32);
	58	}
	59
	60	static void lnw_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
	61	{
	62	struct lnw_gpio *lnw = container_of(chip, struct lnw_gpio, chip);
	63	u8 reg = offset / 32;
	64	void __iomem gpsr, gpcr;
65
66	if (value) {
67	gpsr = (void __iomem *)(&lnw->reg_base->GPSR[reg]);
68	writel(BIT(offset % 32), gpsr);
69	} else {
70	gpcr = (void __iomem *)(&lnw->reg_base->GPCR[reg]);
71	writel(BIT(offset % 32), gpcr);
72	}
73	}
74
75	static int lnw_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
76	{
77	struct lnw_gpio *lnw = container_of(chip, struct lnw_gpio, chip);
78	u8 reg = offset / 32;
79	u32 value;
80	unsigned long flags;
81	void __iomem *gpdr;
82
83	gpdr = (void __iomem *)(&lnw->reg_base->GPDR[reg]);
84	spin_lock_irqsave(&lnw->lock, flags);
85	value = readl(gpdr);
86	value &= ~BIT(offset % 32);
87	writel(value, gpdr);
88	spin_unlock_irqrestore(&lnw->lock, flags);
89	return 0;
90	}
91
92	static int lnw_gpio_direction_output(struct gpio_chip *chip,
93	unsigned offset, int value)
94	{
95	struct lnw_gpio *lnw = container_of(chip, struct lnw_gpio, chip);
96	u8 reg = offset / 32;
97	unsigned long flags;
98	void __iomem *gpdr;
99
100	lnw_gpio_set(chip, offset, value);
101	gpdr = (void __iomem *)(&lnw->reg_base->GPDR[reg]);
102	spin_lock_irqsave(&lnw->lock, flags);
103	value = readl(gpdr);
104	value \|= BIT(offset % 32);;
105	writel(value, gpdr);
106	spin_unlock_irqrestore(&lnw->lock, flags);
107	return 0;
108	}
109
110	static int lnw_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
111	{
112	struct lnw_gpio *lnw = container_of(chip, struct lnw_gpio, chip);
113	return lnw->irq_base + offset;
114	}
115
116	static int lnw_irq_type(unsigned irq, unsigned type)
117	{
118	struct lnw_gpio *lnw = get_irq_chip_data(irq);
119	u32 gpio = irq - lnw->irq_base;
120	u8 reg = gpio / 32;
121	unsigned long flags;
122	u32 value;
123	void __iomem grer = (void __iomem )(&lnw->reg_base->GRER[reg]);
124	void __iomem gfer = (void __iomem )(&lnw->reg_base->GFER[reg]);
125
126	if (gpio < 0 \|\| gpio > lnw->chip.ngpio)
127	return -EINVAL;
128	spin_lock_irqsave(&lnw->lock, flags);
129	if (type & IRQ_TYPE_EDGE_RISING)
130	value = readl(grer) \| BIT(gpio % 32);
131	else
132	value = readl(grer) & (~BIT(gpio % 32));
133	writel(value, grer);
134
135	if (type & IRQ_TYPE_EDGE_FALLING)
136	value = readl(gfer) \| BIT(gpio % 32);
137	else
138	value = readl(gfer) & (~BIT(gpio % 32));
139	writel(value, gfer);
140	spin_unlock_irqrestore(&lnw->lock, flags);
141
142	return 0;
143	};
144
145	static void lnw_irq_unmask(unsigned irq)
146	{
147	struct lnw_gpio *lnw = get_irq_chip_data(irq);
148	u32 gpio = irq - lnw->irq_base;
149	u8 reg = gpio / 32;
150	void __iomem *gedr;
151
152	gedr = (void __iomem *)(&lnw->reg_base->GEDR[reg]);
153	writel(BIT(gpio % 32), gedr);
154	};
155
156	static void lnw_irq_mask(unsigned irq)
157	{
158	};
159
160	static struct irq_chip lnw_irqchip = {
161	.name = "LNW-GPIO",
162	.mask = lnw_irq_mask,
163	.unmask = lnw_irq_unmask,
164	.set_type = lnw_irq_type,
165	};
166
167	static struct pci_device_id lnw_gpio_ids[] = {
168	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x080f) },
169	{ 0, }
170	};
171	MODULE_DEVICE_TABLE(pci, lnw_gpio_ids);
172
173	static void lnw_irq_handler(unsigned irq, struct irq_desc *desc)
174	{
175	struct lnw_gpio lnw = (struct lnw_gpio )get_irq_data(irq);
176	u32 reg, gpio;
177	void __iomem *gedr;
178	u32 gedr_v;
179
180	/* check GPIO controller to check which pin triggered the interrupt */
181	for (reg = 0; reg < lnw->chip.ngpio / 32; reg++) {
182	gedr = (void __iomem *)(&lnw->reg_base->GEDR[reg]);
183	gedr_v = readl(gedr);
184	if (!gedr_v)
185	continue;
186	for (gpio = reg32; gpio < reg32+32; gpio++) {
187	gedr_v = readl(gedr);
188	if (gedr_v & BIT(gpio % 32)) {
189	pr_debug("pin %d triggered\n", gpio);
190	generic_handle_irq(lnw->irq_base + gpio);
191	}
192	}
193	/* clear the edge detect status bit */
194	writel(gedr_v, gedr);
195	}
196	desc->chip->eoi(irq);
197	}
198
199	static int __devinit lnw_gpio_probe(struct pci_dev *pdev,
200	const struct pci_device_id *id)
201	{
202	void *base;
203	int i;
204	resource_size_t start, len;
205	struct lnw_gpio *lnw;
206	u32 irq_base;
207	u32 gpio_base;
208	int retval = 0;
209
210	retval = pci_enable_device(pdev);
211	if (retval)
212	goto done;
213
214	retval = pci_request_regions(pdev, "langwell_gpio");
215	if (retval) {
216	dev_err(&pdev->dev, "error requesting resources\n");
217	goto err2;
218	}
219	/* get the irq_base from bar1 */
220	start = pci_resource_start(pdev, 1);
221	len = pci_resource_len(pdev, 1);
222	base = ioremap_nocache(start, len);
223	if (!base) {
224	dev_err(&pdev->dev, "error mapping bar1\n");
225	goto err3;
226	}
227	irq_base = (u32 )base;
228	gpio_base = ((u32 )base + 1);
229	/* release the IO mapping, since we already get the info from bar1 */
230	iounmap(base);
231	/* get the register base from bar0 */
232	start = pci_resource_start(pdev, 0);
233	len = pci_resource_len(pdev, 0);
234	base = ioremap_nocache(start, len);
235	if (!base) {
236	dev_err(&pdev->dev, "error mapping bar0\n");
237	retval = -EFAULT;
238	goto err3;
239	}
240
241	lnw = kzalloc(sizeof(struct lnw_gpio), GFP_KERNEL);
242	if (!lnw) {
243	dev_err(&pdev->dev, "can't allocate langwell_gpio chip data\n");
244	retval = -ENOMEM;
245	goto err4;
246	}
247	lnw->reg_base = base;
248	lnw->irq_base = irq_base;
249	lnw->chip.label = dev_name(&pdev->dev);
250	lnw->chip.direction_input = lnw_gpio_direction_input;
251	lnw->chip.direction_output = lnw_gpio_direction_output;
252	lnw->chip.get = lnw_gpio_get;
253	lnw->chip.set = lnw_gpio_set;
254	lnw->chip.to_irq = lnw_gpio_to_irq;
255	lnw->chip.base = gpio_base;
256	lnw->chip.ngpio = 64;
257	lnw->chip.can_sleep = 0;
258	pci_set_drvdata(pdev, lnw);
259	retval = gpiochip_add(&lnw->chip);
260	if (retval) {
261	dev_err(&pdev->dev, "langwell gpiochip_add error %d\n", retval);
262	goto err5;
263	}
264	set_irq_data(pdev->irq, lnw);
265	set_irq_chained_handler(pdev->irq, lnw_irq_handler);
266	for (i = 0; i < lnw->chip.ngpio; i++) {
267	set_irq_chip_and_handler_name(i + lnw->irq_base, &lnw_irqchip,
268	handle_simple_irq, "demux");
269	set_irq_chip_data(i + lnw->irq_base, lnw);
270	}
271
272	spin_lock_init(&lnw->lock);
273	goto done;
274	err5:
275	kfree(lnw);
276	err4:
277	iounmap(base);
278	err3:
279	pci_release_regions(pdev);
280	err2:
281	pci_disable_device(pdev);
282	done:
283	return retval;
284	}
285
286	static struct pci_driver lnw_gpio_driver = {
287	.name = "langwell_gpio",
288	.id_table = lnw_gpio_ids,
289	.probe = lnw_gpio_probe,
290	};
291
292	static int __init lnw_gpio_init(void)
293	{
294	return pci_register_driver(&lnw_gpio_driver);
295	}
296
297	device_initcall(lnw_gpio_init);