[deliverable/linux.git] / drivers / gpio / pch_gpio.c

/*
 * Copyright (C) 2010 OKI SEMICONDUCTOR Co., LTD.
 *
 * 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 of the License.
 *
 * 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/kernel.h>
#include <linux/pci.h>
#include <linux/gpio.h>

#define PCH_GPIO_ALL_PINS	0xfff /* Mask for GPIO pins 0 to 11 */
#define GPIO_NUM_PINS	12	/* Specifies number of GPIO PINS GPIO0-GPIO11 */

struct pch_regs {
	u32	ien;
	u32	istatus;
	u32	idisp;
	u32	iclr;
	u32	imask;
	u32	imaskclr;
	u32	po;
	u32	pi;
	u32	pm;
	u32	im0;
	u32	im1;
	u32	reserved[4];
	u32	reset;
};

/**
 * struct pch_gpio_reg_data - The register store data.
 * @po_reg:	To store contents of PO register.
 * @pm_reg:	To store contents of PM register.
 */
struct pch_gpio_reg_data {
	u32 po_reg;
	u32 pm_reg;
};

/**
 * struct pch_gpio - GPIO private data structure.
 * @base:			PCI base address of Memory mapped I/O register.
 * @reg:			Memory mapped PCH GPIO register list.
 * @dev:			Pointer to device structure.
 * @gpio:			Data for GPIO infrastructure.
 * @pch_gpio_reg:		Memory mapped Register data is saved here
 *				when suspend.
 */
struct pch_gpio {
	void __iomem *base;
	struct pch_regs __iomem *reg;
	struct device *dev;
	struct gpio_chip gpio;
	struct pch_gpio_reg_data pch_gpio_reg;
	struct mutex lock;
};

static void pch_gpio_set(struct gpio_chip *gpio, unsigned nr, int val)
{
	u32 reg_val;
	struct pch_gpio *chip =	container_of(gpio, struct pch_gpio, gpio);

	mutex_lock(&chip->lock);
	reg_val = ioread32(&chip->reg->po);
	if (val)
		reg_val |= (1 << nr);
	else
		reg_val &= ~(1 << nr);

	iowrite32(reg_val, &chip->reg->po);
	mutex_unlock(&chip->lock);
}

static int pch_gpio_get(struct gpio_chip *gpio, unsigned nr)
{
	struct pch_gpio *chip =	container_of(gpio, struct pch_gpio, gpio);

	return ioread32(&chip->reg->pi) & (1 << nr);
}

static int pch_gpio_direction_output(struct gpio_chip *gpio, unsigned nr,
				     int val)
{
	struct pch_gpio *chip =	container_of(gpio, struct pch_gpio, gpio);
	u32 pm;
	u32 reg_val;

	mutex_lock(&chip->lock);
	pm = ioread32(&chip->reg->pm) & PCH_GPIO_ALL_PINS;
	pm |= (1 << nr);
	iowrite32(pm, &chip->reg->pm);

	reg_val = ioread32(&chip->reg->po);
	if (val)
		reg_val |= (1 << nr);
	else
		reg_val &= ~(1 << nr);
	iowrite32(reg_val, &chip->reg->po);

	mutex_unlock(&chip->lock);

	return 0;
}

static int pch_gpio_direction_input(struct gpio_chip *gpio, unsigned nr)
{
	struct pch_gpio *chip =	container_of(gpio, struct pch_gpio, gpio);
	u32 pm;

	mutex_lock(&chip->lock);
	pm = ioread32(&chip->reg->pm) & PCH_GPIO_ALL_PINS; /*bits 0-11*/
	pm &= ~(1 << nr);
	iowrite32(pm, &chip->reg->pm);
	mutex_unlock(&chip->lock);

	return 0;
}

/*
 * Save register configuration and disable interrupts.
 */
static void pch_gpio_save_reg_conf(struct pch_gpio *chip)
{
	chip->pch_gpio_reg.po_reg = ioread32(&chip->reg->po);
	chip->pch_gpio_reg.pm_reg = ioread32(&chip->reg->pm);
}

/*
 * This function restores the register configuration of the GPIO device.
 */
static void pch_gpio_restore_reg_conf(struct pch_gpio *chip)
{
	/* to store contents of PO register */
	iowrite32(chip->pch_gpio_reg.po_reg, &chip->reg->po);
	/* to store contents of PM register */
	iowrite32(chip->pch_gpio_reg.pm_reg, &chip->reg->pm);
}

static void pch_gpio_setup(struct pch_gpio *chip)
{
	struct gpio_chip *gpio = &chip->gpio;

	gpio->label = dev_name(chip->dev);
	gpio->owner = THIS_MODULE;
	gpio->direction_input = pch_gpio_direction_input;
	gpio->get = pch_gpio_get;
	gpio->direction_output = pch_gpio_direction_output;
	gpio->set = pch_gpio_set;
	gpio->dbg_show = NULL;
	gpio->base = -1;
	gpio->ngpio = GPIO_NUM_PINS;
	gpio->can_sleep = 0;
}

static int __devinit pch_gpio_probe(struct pci_dev *pdev,
				    const struct pci_device_id *id)
{
	s32 ret;
	struct pch_gpio *chip;

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

	chip->dev = &pdev->dev;
	ret = pci_enable_device(pdev);
	if (ret) {
		dev_err(&pdev->dev, "%s : pci_enable_device FAILED", __func__);
		goto err_pci_enable;
	}

	ret = pci_request_regions(pdev, KBUILD_MODNAME);
	if (ret) {
		dev_err(&pdev->dev, "pci_request_regions FAILED-%d", ret);
		goto err_request_regions;
	}

	chip->base = pci_iomap(pdev, 1, 0);
	if (chip->base == 0) {
		dev_err(&pdev->dev, "%s : pci_iomap FAILED", __func__);
		ret = -ENOMEM;
		goto err_iomap;
	}

	chip->reg = chip->base;
	pci_set_drvdata(pdev, chip);
	mutex_init(&chip->lock);
	pch_gpio_setup(chip);
	ret = gpiochip_add(&chip->gpio);
	if (ret) {
		dev_err(&pdev->dev, "PCH gpio: Failed to register GPIO\n");
		goto err_gpiochip_add;
	}

	return 0;

err_gpiochip_add:
	pci_iounmap(pdev, chip->base);

err_iomap:
	pci_release_regions(pdev);

err_request_regions:
	pci_disable_device(pdev);

err_pci_enable:
	kfree(chip);
	dev_err(&pdev->dev, "%s Failed returns %d\n", __func__, ret);
	return ret;
}

static void __devexit pch_gpio_remove(struct pci_dev *pdev)
{
	int err;
	struct pch_gpio *chip = pci_get_drvdata(pdev);

	err = gpiochip_remove(&chip->gpio);
	if (err)
		dev_err(&pdev->dev, "Failed gpiochip_remove\n");

	pci_iounmap(pdev, chip->base);
	pci_release_regions(pdev);
	pci_disable_device(pdev);
	kfree(chip);
}

#ifdef CONFIG_PM
static int pch_gpio_suspend(struct pci_dev *pdev, pm_message_t state)
{
	s32 ret;
	struct pch_gpio *chip = pci_get_drvdata(pdev);

	pch_gpio_save_reg_conf(chip);
	pch_gpio_restore_reg_conf(chip);

	ret = pci_save_state(pdev);
	if (ret) {
		dev_err(&pdev->dev, "pci_save_state Failed-%d\n", ret);
		return ret;
	}
	pci_disable_device(pdev);
	pci_set_power_state(pdev, PCI_D0);
	ret = pci_enable_wake(pdev, PCI_D0, 1);
	if (ret)
		dev_err(&pdev->dev, "pci_enable_wake Failed -%d\n", ret);

	return 0;
}

static int pch_gpio_resume(struct pci_dev *pdev)
{
	s32 ret;
	struct pch_gpio *chip = pci_get_drvdata(pdev);

	ret = pci_enable_wake(pdev, PCI_D0, 0);

	pci_set_power_state(pdev, PCI_D0);
	ret = pci_enable_device(pdev);
	if (ret) {
		dev_err(&pdev->dev, "pci_enable_device Failed-%d ", ret);
		return ret;
	}
	pci_restore_state(pdev);

	iowrite32(0x01, &chip->reg->reset);
	iowrite32(0x00, &chip->reg->reset);
	pch_gpio_restore_reg_conf(chip);

	return 0;
}
#else
#define pch_gpio_suspend NULL
#define pch_gpio_resume NULL
#endif

static DEFINE_PCI_DEVICE_TABLE(pch_gpio_pcidev_id) = {
	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8803) },
	{ 0, }
};
MODULE_DEVICE_TABLE(pci, pch_gpio_pcidev_id);

static struct pci_driver pch_gpio_driver = {
	.name = "pch_gpio",
	.id_table = pch_gpio_pcidev_id,
	.probe = pch_gpio_probe,
	.remove = __devexit_p(pch_gpio_remove),
	.suspend = pch_gpio_suspend,
	.resume = pch_gpio_resume
};

static int __init pch_gpio_pci_init(void)
{
	return pci_register_driver(&pch_gpio_driver);
}
module_init(pch_gpio_pci_init);

static void __exit pch_gpio_pci_exit(void)
{
	pci_unregister_driver(&pch_gpio_driver);
}
module_exit(pch_gpio_pci_exit);

MODULE_DESCRIPTION("PCH GPIO PCI Driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
04c17aa8 TM	1	/*
	2	* Copyright (C) 2010 OKI SEMICONDUCTOR Co., LTD.
	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 as published by
	6	* the Free Software Foundation; version 2 of the License.
	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., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
	16	*/
	17	#include <linux/kernel.h>
	18	#include <linux/pci.h>
	19	#include <linux/gpio.h>
	20
	21	#define PCH_GPIO_ALL_PINS 0xfff /* Mask for GPIO pins 0 to 11 */
	22	#define GPIO_NUM_PINS 12 /* Specifies number of GPIO PINS GPIO0-GPIO11 */
	23
	24	struct pch_regs {
	25	u32 ien;
	26	u32 istatus;
	27	u32 idisp;
	28	u32 iclr;
	29	u32 imask;
	30	u32 imaskclr;
	31	u32 po;
	32	u32 pi;
	33	u32 pm;
	34	u32 im0;
	35	u32 im1;
	36	u32 reserved[4];
	37	u32 reset;
	38	};
	39
	40	/**
	41	* struct pch_gpio_reg_data - The register store data.
	42	* @po_reg: To store contents of PO register.
	43	* @pm_reg: To store contents of PM register.
	44	*/
	45	struct pch_gpio_reg_data {
	46	u32 po_reg;
	47	u32 pm_reg;
	48	};
	49
	50	/**
	51	* struct pch_gpio - GPIO private data structure.
	52	* @base: PCI base address of Memory mapped I/O register.
	53	* @reg: Memory mapped PCH GPIO register list.
	54	* @dev: Pointer to device structure.
	55	* @gpio: Data for GPIO infrastructure.
	56	* @pch_gpio_reg: Memory mapped Register data is saved here
	57	* when suspend.
	58	*/
	59	struct pch_gpio {
	60	void __iomem *base;
	61	struct pch_regs __iomem *reg;
	62	struct device *dev;
	63	struct gpio_chip gpio;
	64	struct pch_gpio_reg_data pch_gpio_reg;
65	struct mutex lock;
66	};
67
68	static void pch_gpio_set(struct gpio_chip *gpio, unsigned nr, int val)
69	{
70	u32 reg_val;
71	struct pch_gpio *chip = container_of(gpio, struct pch_gpio, gpio);
72
73	mutex_lock(&chip->lock);
74	reg_val = ioread32(&chip->reg->po);
75	if (val)
76	reg_val \|= (1 << nr);
77	else
78	reg_val &= ~(1 << nr);
79
80	iowrite32(reg_val, &chip->reg->po);
81	mutex_unlock(&chip->lock);
82	}
83
84	static int pch_gpio_get(struct gpio_chip *gpio, unsigned nr)
85	{
86	struct pch_gpio *chip = container_of(gpio, struct pch_gpio, gpio);
87
88	return ioread32(&chip->reg->pi) & (1 << nr);
89	}
90
91	static int pch_gpio_direction_output(struct gpio_chip *gpio, unsigned nr,
92	int val)
93	{
94	struct pch_gpio *chip = container_of(gpio, struct pch_gpio, gpio);
95	u32 pm;
96	u32 reg_val;
97
98	mutex_lock(&chip->lock);
99	pm = ioread32(&chip->reg->pm) & PCH_GPIO_ALL_PINS;
100	pm \|= (1 << nr);
101	iowrite32(pm, &chip->reg->pm);
102
103	reg_val = ioread32(&chip->reg->po);
104	if (val)
105	reg_val \|= (1 << nr);
106	else
107	reg_val &= ~(1 << nr);
88aab934	108	iowrite32(reg_val, &chip->reg->po);
04c17aa8 TM	109
	110	mutex_unlock(&chip->lock);
	111
	112	return 0;
	113	}
	114
	115	static int pch_gpio_direction_input(struct gpio_chip *gpio, unsigned nr)
	116	{
	117	struct pch_gpio *chip = container_of(gpio, struct pch_gpio, gpio);
	118	u32 pm;
	119
	120	mutex_lock(&chip->lock);
	121	pm = ioread32(&chip->reg->pm) & PCH_GPIO_ALL_PINS; /bits 0-11/
	122	pm &= ~(1 << nr);
	123	iowrite32(pm, &chip->reg->pm);
	124	mutex_unlock(&chip->lock);
	125
	126	return 0;
	127	}
	128
	129	/*
	130	* Save register configuration and disable interrupts.
	131	*/
	132	static void pch_gpio_save_reg_conf(struct pch_gpio *chip)
	133	{
	134	chip->pch_gpio_reg.po_reg = ioread32(&chip->reg->po);
	135	chip->pch_gpio_reg.pm_reg = ioread32(&chip->reg->pm);
	136	}
	137
	138	/*
	139	* This function restores the register configuration of the GPIO device.
	140	*/
	141	static void pch_gpio_restore_reg_conf(struct pch_gpio *chip)
	142	{
	143	/* to store contents of PO register */
	144	iowrite32(chip->pch_gpio_reg.po_reg, &chip->reg->po);
	145	/* to store contents of PM register */
	146	iowrite32(chip->pch_gpio_reg.pm_reg, &chip->reg->pm);
	147	}
	148
	149	static void pch_gpio_setup(struct pch_gpio *chip)
	150	{
	151	struct gpio_chip *gpio = &chip->gpio;
	152
	153	gpio->label = dev_name(chip->dev);
	154	gpio->owner = THIS_MODULE;
	155	gpio->direction_input = pch_gpio_direction_input;
	156	gpio->get = pch_gpio_get;
	157	gpio->direction_output = pch_gpio_direction_output;
	158	gpio->set = pch_gpio_set;
	159	gpio->dbg_show = NULL;
	160	gpio->base = -1;
	161	gpio->ngpio = GPIO_NUM_PINS;
	162	gpio->can_sleep = 0;
	163	}
	164
	165	static int __devinit pch_gpio_probe(struct pci_dev *pdev,
	166	const struct pci_device_id *id)
	167	{
	168	s32 ret;
	169	struct pch_gpio *chip;
	170
	171	chip = kzalloc(sizeof(*chip), GFP_KERNEL);
	172	if (chip == NULL)
173	return -ENOMEM;
174
175	chip->dev = &pdev->dev;
176	ret = pci_enable_device(pdev);
177	if (ret) {
178	dev_err(&pdev->dev, "%s : pci_enable_device FAILED", __func__);
179	goto err_pci_enable;
180	}
181
182	ret = pci_request_regions(pdev, KBUILD_MODNAME);
183	if (ret) {
184	dev_err(&pdev->dev, "pci_request_regions FAILED-%d", ret);
185	goto err_request_regions;
186	}
187
188	chip->base = pci_iomap(pdev, 1, 0);
189	if (chip->base == 0) {
190	dev_err(&pdev->dev, "%s : pci_iomap FAILED", __func__);
191	ret = -ENOMEM;
192	goto err_iomap;
193	}
194
195	chip->reg = chip->base;
196	pci_set_drvdata(pdev, chip);
197	mutex_init(&chip->lock);
198	pch_gpio_setup(chip);
199	ret = gpiochip_add(&chip->gpio);
200	if (ret) {
201	dev_err(&pdev->dev, "PCH gpio: Failed to register GPIO\n");
202	goto err_gpiochip_add;
203	}
204
205	return 0;
206
207	err_gpiochip_add:
208	pci_iounmap(pdev, chip->base);
209
210	err_iomap:
211	pci_release_regions(pdev);
212
213	err_request_regions:
214	pci_disable_device(pdev);
215
216	err_pci_enable:
217	kfree(chip);
218	dev_err(&pdev->dev, "%s Failed returns %d\n", __func__, ret);
219	return ret;
220	}
221
222	static void __devexit pch_gpio_remove(struct pci_dev *pdev)
223	{
224	int err;
225	struct pch_gpio *chip = pci_get_drvdata(pdev);
226
227	err = gpiochip_remove(&chip->gpio);
228	if (err)
229	dev_err(&pdev->dev, "Failed gpiochip_remove\n");
230
231	pci_iounmap(pdev, chip->base);
232	pci_release_regions(pdev);
233	pci_disable_device(pdev);
234	kfree(chip);
235	}
236
237	#ifdef CONFIG_PM
238	static int pch_gpio_suspend(struct pci_dev *pdev, pm_message_t state)
239	{
240	s32 ret;
241	struct pch_gpio *chip = pci_get_drvdata(pdev);
242
243	pch_gpio_save_reg_conf(chip);
244	pch_gpio_restore_reg_conf(chip);
245
246	ret = pci_save_state(pdev);
247	if (ret) {
248	dev_err(&pdev->dev, "pci_save_state Failed-%d\n", ret);
249	return ret;
250	}
251	pci_disable_device(pdev);
252	pci_set_power_state(pdev, PCI_D0);
253	ret = pci_enable_wake(pdev, PCI_D0, 1);
254	if (ret)
255	dev_err(&pdev->dev, "pci_enable_wake Failed -%d\n", ret);
256
257	return 0;
258	}
259
260	static int pch_gpio_resume(struct pci_dev *pdev)
261	{
262	s32 ret;
263	struct pch_gpio *chip = pci_get_drvdata(pdev);
264
265	ret = pci_enable_wake(pdev, PCI_D0, 0);
266
267	pci_set_power_state(pdev, PCI_D0);
268	ret = pci_enable_device(pdev);
269	if (ret) {
270	dev_err(&pdev->dev, "pci_enable_device Failed-%d ", ret);
271	return ret;
272	}
273	pci_restore_state(pdev);
274
275	iowrite32(0x01, &chip->reg->reset);
276	iowrite32(0x00, &chip->reg->reset);
277	pch_gpio_restore_reg_conf(chip);
278
279	return 0;
280	}
281	#else
282	#define pch_gpio_suspend NULL
283	#define pch_gpio_resume NULL
284	#endif
285
286	static DEFINE_PCI_DEVICE_TABLE(pch_gpio_pcidev_id) = {
287	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8803) },
288	{ 0, }
289	};
19234cdd	290	MODULE_DEVICE_TABLE(pci, pch_gpio_pcidev_id);
04c17aa8 TM	291
	292	static struct pci_driver pch_gpio_driver = {
	293	.name = "pch_gpio",
	294	.id_table = pch_gpio_pcidev_id,
	295	.probe = pch_gpio_probe,
	296	.remove = __devexit_p(pch_gpio_remove),
	297	.suspend = pch_gpio_suspend,
	298	.resume = pch_gpio_resume
	299	};
	300
	301	static int __init pch_gpio_pci_init(void)
	302	{
	303	return pci_register_driver(&pch_gpio_driver);
	304	}
	305	module_init(pch_gpio_pci_init);
	306
	307	static void __exit pch_gpio_pci_exit(void)
	308	{
	309	pci_unregister_driver(&pch_gpio_driver);
	310	}
	311	module_exit(pch_gpio_pci_exit);
	312
	313	MODULE_DESCRIPTION("PCH GPIO PCI Driver");
	314	MODULE_LICENSE("GPL");