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

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2015-2018 Pengutronix, Uwe Kleine-König <kernel@pengutronix.de>
 */

#include <linux/module.h>
#include <linux/siox.h>
#include <linux/gpio/driver.h>
#include <linux/of.h>

struct gpio_siox_ddata {
	struct gpio_chip gchip;
	struct irq_chip ichip;
	struct mutex lock;
	u8 setdata[1];
	u8 getdata[3];

	spinlock_t irqlock;
	u32 irq_enable;
	u32 irq_status;
	u32 irq_type[20];
};

/*
 * Note that this callback only sets the value that is clocked out in the next
 * cycle.
 */
static int gpio_siox_set_data(struct siox_device *sdevice, u8 status, u8 buf[])
{
	struct gpio_siox_ddata *ddata = dev_get_drvdata(&sdevice->dev);

	mutex_lock(&ddata->lock);
	buf[0] = ddata->setdata[0];
	mutex_unlock(&ddata->lock);

	return 0;
}

static int gpio_siox_get_data(struct siox_device *sdevice, const u8 buf[])
{
	struct gpio_siox_ddata *ddata = dev_get_drvdata(&sdevice->dev);
	size_t offset;
	u32 trigger;

	mutex_lock(&ddata->lock);

	spin_lock_irq(&ddata->irqlock);

	for (offset = 0; offset < 12; ++offset) {
		unsigned int bitpos = 11 - offset;
		unsigned int gpiolevel = buf[bitpos / 8] & (1 << bitpos % 8);
		unsigned int prev_level =
			ddata->getdata[bitpos / 8] & (1 << (bitpos % 8));
		u32 irq_type = ddata->irq_type[offset];

		if (gpiolevel) {
			if ((irq_type & IRQ_TYPE_LEVEL_HIGH) ||
			    ((irq_type & IRQ_TYPE_EDGE_RISING) && !prev_level))
				ddata->irq_status |= 1 << offset;
		} else {
			if ((irq_type & IRQ_TYPE_LEVEL_LOW) ||
			    ((irq_type & IRQ_TYPE_EDGE_FALLING) && prev_level))
				ddata->irq_status |= 1 << offset;
		}
	}

	trigger = ddata->irq_status & ddata->irq_enable;

	spin_unlock_irq(&ddata->irqlock);

	ddata->getdata[0] = buf[0];
	ddata->getdata[1] = buf[1];
	ddata->getdata[2] = buf[2];

	mutex_unlock(&ddata->lock);

	for (offset = 0; offset < 12; ++offset) {
		if (trigger & (1 << offset)) {
			struct irq_domain *irqdomain = ddata->gchip.irq.domain;
			unsigned int irq = irq_find_mapping(irqdomain, offset);

			/*
			 * Conceptually handle_nested_irq should call the flow
			 * handler of the irq chip. But it doesn't, so we have
			 * to clean the irq_status here.
			 */
			spin_lock_irq(&ddata->irqlock);
			ddata->irq_status &= ~(1 << offset);
			spin_unlock_irq(&ddata->irqlock);

			handle_nested_irq(irq);
		}
	}

	return 0;
}

static void gpio_siox_irq_ack(struct irq_data *d)
{
	struct irq_chip *ic = irq_data_get_irq_chip(d);
	struct gpio_siox_ddata *ddata =
		container_of(ic, struct gpio_siox_ddata, ichip);

	spin_lock_irq(&ddata->irqlock);
	ddata->irq_status &= ~(1 << d->hwirq);
	spin_unlock_irq(&ddata->irqlock);
}

static void gpio_siox_irq_mask(struct irq_data *d)
{
	struct irq_chip *ic = irq_data_get_irq_chip(d);
	struct gpio_siox_ddata *ddata =
		container_of(ic, struct gpio_siox_ddata, ichip);

	spin_lock_irq(&ddata->irqlock);
	ddata->irq_enable &= ~(1 << d->hwirq);
	spin_unlock_irq(&ddata->irqlock);
}

static void gpio_siox_irq_unmask(struct irq_data *d)
{
	struct irq_chip *ic = irq_data_get_irq_chip(d);
	struct gpio_siox_ddata *ddata =
		container_of(ic, struct gpio_siox_ddata, ichip);

	spin_lock_irq(&ddata->irqlock);
	ddata->irq_enable |= 1 << d->hwirq;
	spin_unlock_irq(&ddata->irqlock);
}

static int gpio_siox_irq_set_type(struct irq_data *d, u32 type)
{
	struct irq_chip *ic = irq_data_get_irq_chip(d);
	struct gpio_siox_ddata *ddata =
		container_of(ic, struct gpio_siox_ddata, ichip);

	spin_lock_irq(&ddata->irqlock);
	ddata->irq_type[d->hwirq] = type;
	spin_unlock_irq(&ddata->irqlock);

	return 0;
}

static int gpio_siox_get(struct gpio_chip *chip, unsigned int offset)
{
	struct gpio_siox_ddata *ddata =
		container_of(chip, struct gpio_siox_ddata, gchip);
	int ret;

	mutex_lock(&ddata->lock);

	if (offset >= 12) {
		unsigned int bitpos = 19 - offset;

		ret = ddata->setdata[0] & (1 << bitpos);
	} else {
		unsigned int bitpos = 11 - offset;

		ret = ddata->getdata[bitpos / 8] & (1 << (bitpos % 8));
	}

	mutex_unlock(&ddata->lock);

	return ret;
}

static void gpio_siox_set(struct gpio_chip *chip,
			  unsigned int offset, int value)
{
	struct gpio_siox_ddata *ddata =
		container_of(chip, struct gpio_siox_ddata, gchip);
	u8 mask = 1 << (19 - offset);

	mutex_lock(&ddata->lock);

	if (value)
		ddata->setdata[0] |= mask;
	else
		ddata->setdata[0] &= ~mask;

	mutex_unlock(&ddata->lock);
}

static int gpio_siox_direction_input(struct gpio_chip *chip,
				     unsigned int offset)
{
	if (offset >= 12)
		return -EINVAL;

	return 0;
}

static int gpio_siox_direction_output(struct gpio_chip *chip,
				      unsigned int offset, int value)
{
	if (offset < 12)
		return -EINVAL;

	gpio_siox_set(chip, offset, value);
	return 0;
}

static int gpio_siox_get_direction(struct gpio_chip *chip, unsigned int offset)
{
	if (offset < 12)
		return 1; /* input */
	else
		return 0; /* output */
}

static int gpio_siox_probe(struct siox_device *sdevice)
{
	struct gpio_siox_ddata *ddata;
	int ret;

	ddata = devm_kzalloc(&sdevice->dev, sizeof(*ddata), GFP_KERNEL);
	if (!ddata)
		return -ENOMEM;

	dev_set_drvdata(&sdevice->dev, ddata);

	mutex_init(&ddata->lock);
	spin_lock_init(&ddata->irqlock);

	ddata->gchip.base = -1;
	ddata->gchip.can_sleep = 1;
	ddata->gchip.parent = &sdevice->dev;
	ddata->gchip.owner = THIS_MODULE;
	ddata->gchip.get = gpio_siox_get;
	ddata->gchip.set = gpio_siox_set;
	ddata->gchip.direction_input = gpio_siox_direction_input;
	ddata->gchip.direction_output = gpio_siox_direction_output;
	ddata->gchip.get_direction = gpio_siox_get_direction;
	ddata->gchip.ngpio = 20;

	ddata->ichip.name = "siox-gpio";
	ddata->ichip.irq_ack = gpio_siox_irq_ack;
	ddata->ichip.irq_mask = gpio_siox_irq_mask;
	ddata->ichip.irq_unmask = gpio_siox_irq_unmask;
	ddata->ichip.irq_set_type = gpio_siox_irq_set_type;

	ret = gpiochip_add(&ddata->gchip);
	if (ret) {
		dev_err(&sdevice->dev,
			"Failed to register gpio chip (%d)\n", ret);
		goto err_gpiochip;
	}

	ret = gpiochip_irqchip_add(&ddata->gchip, &ddata->ichip,
				   0, handle_level_irq, IRQ_TYPE_EDGE_RISING);
	if (ret) {
		dev_err(&sdevice->dev,
			"Failed to register irq chip (%d)\n", ret);
err_gpiochip:
		gpiochip_remove(&ddata->gchip);
	}

	return ret;
}

static int gpio_siox_remove(struct siox_device *sdevice)
{
	struct gpio_siox_ddata *ddata = dev_get_drvdata(&sdevice->dev);

	gpiochip_remove(&ddata->gchip);
	return 0;
}

static struct siox_driver gpio_siox_driver = {
	.probe = gpio_siox_probe,
	.remove = gpio_siox_remove,
	.set_data = gpio_siox_set_data,
	.get_data = gpio_siox_get_data,
	.driver = {
		.name = "gpio-siox",
	},
};

static int __init gpio_siox_init(void)
{
	return siox_driver_register(&gpio_siox_driver);
}
module_init(gpio_siox_init);

static void __exit gpio_siox_exit(void)
{
	siox_driver_unregister(&gpio_siox_driver);
}
module_exit(gpio_siox_exit);

MODULE_AUTHOR("Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>");
MODULE_DESCRIPTION("SIOX gpio driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
be8c8fac UKK	1	// SPDX-License-Identifier: GPL-2.0
	2	/*
	3	* Copyright (C) 2015-2018 Pengutronix, Uwe Kleine-König <kernel@pengutronix.de>
	4	*/
	5
	6	#include <linux/module.h>
	7	#include <linux/siox.h>
	8	#include <linux/gpio/driver.h>
	9	#include <linux/of.h>
	10
	11	struct gpio_siox_ddata {
	12	struct gpio_chip gchip;
	13	struct irq_chip ichip;
	14	struct mutex lock;
	15	u8 setdata[1];
	16	u8 getdata[3];
	17
	18	spinlock_t irqlock;
	19	u32 irq_enable;
	20	u32 irq_status;
	21	u32 irq_type[20];
	22	};
	23
	24	/*
	25	* Note that this callback only sets the value that is clocked out in the next
	26	* cycle.
	27	*/
	28	static int gpio_siox_set_data(struct siox_device *sdevice, u8 status, u8 buf[])
	29	{
	30	struct gpio_siox_ddata *ddata = dev_get_drvdata(&sdevice->dev);
	31
	32	mutex_lock(&ddata->lock);
	33	buf[0] = ddata->setdata[0];
	34	mutex_unlock(&ddata->lock);
	35
	36	return 0;
	37	}
	38
	39	static int gpio_siox_get_data(struct siox_device *sdevice, const u8 buf[])
	40	{
	41	struct gpio_siox_ddata *ddata = dev_get_drvdata(&sdevice->dev);
	42	size_t offset;
	43	u32 trigger;
	44
	45	mutex_lock(&ddata->lock);
	46
	47	spin_lock_irq(&ddata->irqlock);
	48
	49	for (offset = 0; offset < 12; ++offset) {
	50	unsigned int bitpos = 11 - offset;
	51	unsigned int gpiolevel = buf[bitpos / 8] & (1 << bitpos % 8);
	52	unsigned int prev_level =
	53	ddata->getdata[bitpos / 8] & (1 << (bitpos % 8));
	54	u32 irq_type = ddata->irq_type[offset];
	55
	56	if (gpiolevel) {
	57	if ((irq_type & IRQ_TYPE_LEVEL_HIGH) \|\|
	58	((irq_type & IRQ_TYPE_EDGE_RISING) && !prev_level))
	59	ddata->irq_status \|= 1 << offset;
	60	} else {
	61	if ((irq_type & IRQ_TYPE_LEVEL_LOW) \|\|
	62	((irq_type & IRQ_TYPE_EDGE_FALLING) && prev_level))
	63	ddata->irq_status \|= 1 << offset;
	64	}
65	}
66
67	trigger = ddata->irq_status & ddata->irq_enable;
68
69	spin_unlock_irq(&ddata->irqlock);
70
71	ddata->getdata[0] = buf[0];
72	ddata->getdata[1] = buf[1];
73	ddata->getdata[2] = buf[2];
74
75	mutex_unlock(&ddata->lock);
76
77	for (offset = 0; offset < 12; ++offset) {
78	if (trigger & (1 << offset)) {
79	struct irq_domain *irqdomain = ddata->gchip.irq.domain;
80	unsigned int irq = irq_find_mapping(irqdomain, offset);
81
82	/*
83	* Conceptually handle_nested_irq should call the flow
84	* handler of the irq chip. But it doesn't, so we have
85	* to clean the irq_status here.
86	*/
87	spin_lock_irq(&ddata->irqlock);
88	ddata->irq_status &= ~(1 << offset);
89	spin_unlock_irq(&ddata->irqlock);
90
91	handle_nested_irq(irq);
92	}
93	}
94
95	return 0;
96	}
97
98	static void gpio_siox_irq_ack(struct irq_data *d)
99	{
100	struct irq_chip *ic = irq_data_get_irq_chip(d);
101	struct gpio_siox_ddata *ddata =
102	container_of(ic, struct gpio_siox_ddata, ichip);
103
104	spin_lock_irq(&ddata->irqlock);
105	ddata->irq_status &= ~(1 << d->hwirq);
106	spin_unlock_irq(&ddata->irqlock);
107	}
108
109	static void gpio_siox_irq_mask(struct irq_data *d)
110	{
111	struct irq_chip *ic = irq_data_get_irq_chip(d);
112	struct gpio_siox_ddata *ddata =
113	container_of(ic, struct gpio_siox_ddata, ichip);
114
115	spin_lock_irq(&ddata->irqlock);
116	ddata->irq_enable &= ~(1 << d->hwirq);
117	spin_unlock_irq(&ddata->irqlock);
118	}
119
120	static void gpio_siox_irq_unmask(struct irq_data *d)
121	{
122	struct irq_chip *ic = irq_data_get_irq_chip(d);
123	struct gpio_siox_ddata *ddata =
124	container_of(ic, struct gpio_siox_ddata, ichip);
125
126	spin_lock_irq(&ddata->irqlock);
127	ddata->irq_enable \|= 1 << d->hwirq;
128	spin_unlock_irq(&ddata->irqlock);
129	}
130
131	static int gpio_siox_irq_set_type(struct irq_data *d, u32 type)
132	{
133	struct irq_chip *ic = irq_data_get_irq_chip(d);
134	struct gpio_siox_ddata *ddata =
135	container_of(ic, struct gpio_siox_ddata, ichip);
136
137	spin_lock_irq(&ddata->irqlock);
138	ddata->irq_type[d->hwirq] = type;
139	spin_unlock_irq(&ddata->irqlock);
140
141	return 0;
142	}
143
144	static int gpio_siox_get(struct gpio_chip *chip, unsigned int offset)
145	{
146	struct gpio_siox_ddata *ddata =
147	container_of(chip, struct gpio_siox_ddata, gchip);
148	int ret;
149
150	mutex_lock(&ddata->lock);
151
152	if (offset >= 12) {
153	unsigned int bitpos = 19 - offset;
154
155	ret = ddata->setdata[0] & (1 << bitpos);
156	} else {
157	unsigned int bitpos = 11 - offset;
158
159	ret = ddata->getdata[bitpos / 8] & (1 << (bitpos % 8));
160	}
161
162	mutex_unlock(&ddata->lock);
163
164	return ret;
165	}
166
167	static void gpio_siox_set(struct gpio_chip *chip,
168	unsigned int offset, int value)
169	{
170	struct gpio_siox_ddata *ddata =
171	container_of(chip, struct gpio_siox_ddata, gchip);
172	u8 mask = 1 << (19 - offset);
173
174	mutex_lock(&ddata->lock);
175
176	if (value)
177	ddata->setdata[0] \|= mask;
178	else
179	ddata->setdata[0] &= ~mask;
180
181	mutex_unlock(&ddata->lock);
182	}
183
184	static int gpio_siox_direction_input(struct gpio_chip *chip,
185	unsigned int offset)
186	{
187	if (offset >= 12)
188	return -EINVAL;
189
190	return 0;
191	}
192
193	static int gpio_siox_direction_output(struct gpio_chip *chip,
194	unsigned int offset, int value)
195	{
196	if (offset < 12)
197	return -EINVAL;
198
199	gpio_siox_set(chip, offset, value);
200	return 0;
201	}
202
203	static int gpio_siox_get_direction(struct gpio_chip *chip, unsigned int offset)
204	{
205	if (offset < 12)
206	return 1; /* input */
207	else
208	return 0; /* output */
209	}
210
211	static int gpio_siox_probe(struct siox_device *sdevice)
212	{
213	struct gpio_siox_ddata *ddata;
214	int ret;
215
216	ddata = devm_kzalloc(&sdevice->dev, sizeof(*ddata), GFP_KERNEL);
217	if (!ddata)
218	return -ENOMEM;
219
220	dev_set_drvdata(&sdevice->dev, ddata);
221
222	mutex_init(&ddata->lock);
223	spin_lock_init(&ddata->irqlock);
224
225	ddata->gchip.base = -1;
226	ddata->gchip.can_sleep = 1;
227	ddata->gchip.parent = &sdevice->dev;
228	ddata->gchip.owner = THIS_MODULE;
229	ddata->gchip.get = gpio_siox_get;
230	ddata->gchip.set = gpio_siox_set;
231	ddata->gchip.direction_input = gpio_siox_direction_input;
232	ddata->gchip.direction_output = gpio_siox_direction_output;
233	ddata->gchip.get_direction = gpio_siox_get_direction;
234	ddata->gchip.ngpio = 20;
235
236	ddata->ichip.name = "siox-gpio";
237	ddata->ichip.irq_ack = gpio_siox_irq_ack;
238	ddata->ichip.irq_mask = gpio_siox_irq_mask;
239	ddata->ichip.irq_unmask = gpio_siox_irq_unmask;
240	ddata->ichip.irq_set_type = gpio_siox_irq_set_type;
241
242	ret = gpiochip_add(&ddata->gchip);
243	if (ret) {
244	dev_err(&sdevice->dev,
245	"Failed to register gpio chip (%d)\n", ret);
246	goto err_gpiochip;
247	}
248
249	ret = gpiochip_irqchip_add(&ddata->gchip, &ddata->ichip,
250	0, handle_level_irq, IRQ_TYPE_EDGE_RISING);
251	if (ret) {
252	dev_err(&sdevice->dev,
253	"Failed to register irq chip (%d)\n", ret);
254	err_gpiochip:
255	gpiochip_remove(&ddata->gchip);
256	}
257
258	return ret;
259	}
260
261	static int gpio_siox_remove(struct siox_device *sdevice)
262	{
263	struct gpio_siox_ddata *ddata = dev_get_drvdata(&sdevice->dev);
264
265	gpiochip_remove(&ddata->gchip);
266	return 0;
267	}
268
269	static struct siox_driver gpio_siox_driver = {
270	.probe = gpio_siox_probe,
271	.remove = gpio_siox_remove,
272	.set_data = gpio_siox_set_data,
273	.get_data = gpio_siox_get_data,
274	.driver = {
275	.name = "gpio-siox",
276	},
277	};
278
279	static int __init gpio_siox_init(void)
280	{
281	return siox_driver_register(&gpio_siox_driver);
282	}
283	module_init(gpio_siox_init);
284
285	static void __exit gpio_siox_exit(void)
286	{
287	siox_driver_unregister(&gpio_siox_driver);
288	}
289	module_exit(gpio_siox_exit);
290
291	MODULE_AUTHOR("Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>");
292	MODULE_DESCRIPTION("SIOX gpio driver");
293	MODULE_LICENSE("GPL v2");