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v4.6
 
  1/*
  2 * Copyright (C) 2013 Altera Corporation
  3 * Based on gpio-mpc8xxx.c
  4 *
  5 * This program is free software; you can redistribute it and/or modify
  6 * it under the terms of the GNU General Public License as published by
  7 * the Free Software Foundation; either version 2 of the License, or
  8 * (at your option) any later version.
  9 *
 10 * This program is distributed in the hope that it will be useful,
 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 13 * GNU General Public License for more details.
 14 *
 15 * You should have received a copy of the GNU General Public License
 16 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 17 */
 18
 
 
 
 19#include <linux/io.h>
 20#include <linux/of_gpio.h>
 
 
 21#include <linux/platform_device.h>
 
 
 
 
 
 22
 23#define ALTERA_GPIO_MAX_NGPIO		32
 24#define ALTERA_GPIO_DATA		0x0
 25#define ALTERA_GPIO_DIR			0x4
 26#define ALTERA_GPIO_IRQ_MASK		0x8
 27#define ALTERA_GPIO_EDGE_CAP		0xc
 28
 29/**
 30* struct altera_gpio_chip
 31* @mmchip		: memory mapped chip structure.
 
 32* @gpio_lock		: synchronization lock so that new irq/set/get requests
 33			  will be blocked until the current one completes.
 34* @interrupt_trigger	: specifies the hardware configured IRQ trigger type
 35			  (rising, falling, both, high)
 36* @mapped_irq		: kernel mapped irq number.
 37*/
 38struct altera_gpio_chip {
 39	struct of_mm_gpio_chip mmchip;
 40	spinlock_t gpio_lock;
 
 41	int interrupt_trigger;
 42	int mapped_irq;
 43};
 44
 45static void altera_gpio_irq_unmask(struct irq_data *d)
 46{
 47	struct altera_gpio_chip *altera_gc;
 48	struct of_mm_gpio_chip *mm_gc;
 49	unsigned long flags;
 50	u32 intmask;
 51
 52	altera_gc = gpiochip_get_data(irq_data_get_irq_chip_data(d));
 53	mm_gc = &altera_gc->mmchip;
 54
 55	spin_lock_irqsave(&altera_gc->gpio_lock, flags);
 56	intmask = readl(mm_gc->regs + ALTERA_GPIO_IRQ_MASK);
 57	/* Set ALTERA_GPIO_IRQ_MASK bit to unmask */
 58	intmask |= BIT(irqd_to_hwirq(d));
 59	writel(intmask, mm_gc->regs + ALTERA_GPIO_IRQ_MASK);
 60	spin_unlock_irqrestore(&altera_gc->gpio_lock, flags);
 61}
 62
 63static void altera_gpio_irq_mask(struct irq_data *d)
 64{
 65	struct altera_gpio_chip *altera_gc;
 66	struct of_mm_gpio_chip *mm_gc;
 67	unsigned long flags;
 68	u32 intmask;
 69
 70	altera_gc = gpiochip_get_data(irq_data_get_irq_chip_data(d));
 71	mm_gc = &altera_gc->mmchip;
 72
 73	spin_lock_irqsave(&altera_gc->gpio_lock, flags);
 74	intmask = readl(mm_gc->regs + ALTERA_GPIO_IRQ_MASK);
 75	/* Clear ALTERA_GPIO_IRQ_MASK bit to mask */
 76	intmask &= ~BIT(irqd_to_hwirq(d));
 77	writel(intmask, mm_gc->regs + ALTERA_GPIO_IRQ_MASK);
 78	spin_unlock_irqrestore(&altera_gc->gpio_lock, flags);
 
 
 79}
 80
 81/**
 82 * This controller's IRQ type is synthesized in hardware, so this function
 83 * just checks if the requested set_type matches the synthesized IRQ type
 84 */
 85static int altera_gpio_irq_set_type(struct irq_data *d,
 86				   unsigned int type)
 87{
 88	struct altera_gpio_chip *altera_gc;
 89
 90	altera_gc = gpiochip_get_data(irq_data_get_irq_chip_data(d));
 91
 92	if (type == IRQ_TYPE_NONE)
 93		return 0;
 94	if (type == IRQ_TYPE_LEVEL_HIGH &&
 95		altera_gc->interrupt_trigger == IRQ_TYPE_LEVEL_HIGH)
 96		return 0;
 97	if (type == IRQ_TYPE_EDGE_RISING &&
 98		altera_gc->interrupt_trigger == IRQ_TYPE_EDGE_RISING)
 99		return 0;
100	if (type == IRQ_TYPE_EDGE_FALLING &&
101		altera_gc->interrupt_trigger == IRQ_TYPE_EDGE_FALLING)
102		return 0;
103	if (type == IRQ_TYPE_EDGE_BOTH &&
104		altera_gc->interrupt_trigger == IRQ_TYPE_EDGE_BOTH)
105		return 0;
106
 
107	return -EINVAL;
108}
109
110static unsigned int altera_gpio_irq_startup(struct irq_data *d)
111{
112	altera_gpio_irq_unmask(d);
113
114	return 0;
115}
116
117static struct irq_chip altera_irq_chip = {
118	.name		= "altera-gpio",
119	.irq_mask	= altera_gpio_irq_mask,
120	.irq_unmask	= altera_gpio_irq_unmask,
121	.irq_set_type	= altera_gpio_irq_set_type,
122	.irq_startup	= altera_gpio_irq_startup,
123	.irq_shutdown	= altera_gpio_irq_mask,
124};
125
126static int altera_gpio_get(struct gpio_chip *gc, unsigned offset)
127{
128	struct of_mm_gpio_chip *mm_gc;
129
130	mm_gc = to_of_mm_gpio_chip(gc);
131
132	return !!(readl(mm_gc->regs + ALTERA_GPIO_DATA) & BIT(offset));
133}
134
135static void altera_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
136{
137	struct of_mm_gpio_chip *mm_gc;
138	struct altera_gpio_chip *chip;
139	unsigned long flags;
140	unsigned int data_reg;
141
142	mm_gc = to_of_mm_gpio_chip(gc);
143	chip = gpiochip_get_data(gc);
144
145	spin_lock_irqsave(&chip->gpio_lock, flags);
146	data_reg = readl(mm_gc->regs + ALTERA_GPIO_DATA);
147	if (value)
148		data_reg |= BIT(offset);
149	else
150		data_reg &= ~BIT(offset);
151	writel(data_reg, mm_gc->regs + ALTERA_GPIO_DATA);
152	spin_unlock_irqrestore(&chip->gpio_lock, flags);
153}
154
155static int altera_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
156{
157	struct of_mm_gpio_chip *mm_gc;
158	struct altera_gpio_chip *chip;
159	unsigned long flags;
160	unsigned int gpio_ddr;
161
162	mm_gc = to_of_mm_gpio_chip(gc);
163	chip = gpiochip_get_data(gc);
164
165	spin_lock_irqsave(&chip->gpio_lock, flags);
166	/* Set pin as input, assumes software controlled IP */
167	gpio_ddr = readl(mm_gc->regs + ALTERA_GPIO_DIR);
168	gpio_ddr &= ~BIT(offset);
169	writel(gpio_ddr, mm_gc->regs + ALTERA_GPIO_DIR);
170	spin_unlock_irqrestore(&chip->gpio_lock, flags);
171
172	return 0;
173}
174
175static int altera_gpio_direction_output(struct gpio_chip *gc,
176		unsigned offset, int value)
177{
178	struct of_mm_gpio_chip *mm_gc;
179	struct altera_gpio_chip *chip;
180	unsigned long flags;
181	unsigned int data_reg, gpio_ddr;
182
183	mm_gc = to_of_mm_gpio_chip(gc);
184	chip = gpiochip_get_data(gc);
185
186	spin_lock_irqsave(&chip->gpio_lock, flags);
187	/* Sets the GPIO value */
188	data_reg = readl(mm_gc->regs + ALTERA_GPIO_DATA);
189	if (value)
190		data_reg |= BIT(offset);
191	else
192		data_reg &= ~BIT(offset);
193	writel(data_reg, mm_gc->regs + ALTERA_GPIO_DATA);
194
195	/* Set pin as output, assumes software controlled IP */
196	gpio_ddr = readl(mm_gc->regs + ALTERA_GPIO_DIR);
197	gpio_ddr |= BIT(offset);
198	writel(gpio_ddr, mm_gc->regs + ALTERA_GPIO_DIR);
199	spin_unlock_irqrestore(&chip->gpio_lock, flags);
200
201	return 0;
202}
203
204static void altera_gpio_irq_edge_handler(struct irq_desc *desc)
205{
206	struct altera_gpio_chip *altera_gc;
 
 
207	struct irq_chip *chip;
208	struct of_mm_gpio_chip *mm_gc;
209	struct irq_domain *irqdomain;
210	unsigned long status;
211	int i;
212
213	altera_gc = gpiochip_get_data(irq_desc_get_handler_data(desc));
214	chip = irq_desc_get_chip(desc);
215	mm_gc = &altera_gc->mmchip;
216	irqdomain = altera_gc->mmchip.gc.irqdomain;
217
218	chained_irq_enter(chip, desc);
219
220	while ((status =
221	      (readl(mm_gc->regs + ALTERA_GPIO_EDGE_CAP) &
222	      readl(mm_gc->regs + ALTERA_GPIO_IRQ_MASK)))) {
223		writel(status, mm_gc->regs + ALTERA_GPIO_EDGE_CAP);
224		for_each_set_bit(i, &status, mm_gc->gc.ngpio) {
225			generic_handle_irq(irq_find_mapping(irqdomain, i));
226		}
227	}
228
229	chained_irq_exit(chip, desc);
230}
231
232
233static void altera_gpio_irq_leveL_high_handler(struct irq_desc *desc)
234{
235	struct altera_gpio_chip *altera_gc;
 
 
236	struct irq_chip *chip;
237	struct of_mm_gpio_chip *mm_gc;
238	struct irq_domain *irqdomain;
239	unsigned long status;
240	int i;
241
242	altera_gc = gpiochip_get_data(irq_desc_get_handler_data(desc));
243	chip = irq_desc_get_chip(desc);
244	mm_gc = &altera_gc->mmchip;
245	irqdomain = altera_gc->mmchip.gc.irqdomain;
246
247	chained_irq_enter(chip, desc);
248
249	status = readl(mm_gc->regs + ALTERA_GPIO_DATA);
250	status &= readl(mm_gc->regs + ALTERA_GPIO_IRQ_MASK);
 
 
 
251
252	for_each_set_bit(i, &status, mm_gc->gc.ngpio) {
253		generic_handle_irq(irq_find_mapping(irqdomain, i));
254	}
255	chained_irq_exit(chip, desc);
256}
257
 
 
 
 
 
 
 
 
 
 
 
258static int altera_gpio_probe(struct platform_device *pdev)
259{
260	struct device_node *node = pdev->dev.of_node;
261	int reg, ret;
262	struct altera_gpio_chip *altera_gc;
 
263
264	altera_gc = devm_kzalloc(&pdev->dev, sizeof(*altera_gc), GFP_KERNEL);
265	if (!altera_gc)
266		return -ENOMEM;
267
268	spin_lock_init(&altera_gc->gpio_lock);
269
270	if (of_property_read_u32(node, "altr,ngpio", &reg))
271		/* By default assume maximum ngpio */
272		altera_gc->mmchip.gc.ngpio = ALTERA_GPIO_MAX_NGPIO;
273	else
274		altera_gc->mmchip.gc.ngpio = reg;
275
276	if (altera_gc->mmchip.gc.ngpio > ALTERA_GPIO_MAX_NGPIO) {
277		dev_warn(&pdev->dev,
278			"ngpio is greater than %d, defaulting to %d\n",
279			ALTERA_GPIO_MAX_NGPIO, ALTERA_GPIO_MAX_NGPIO);
280		altera_gc->mmchip.gc.ngpio = ALTERA_GPIO_MAX_NGPIO;
281	}
282
283	altera_gc->mmchip.gc.direction_input	= altera_gpio_direction_input;
284	altera_gc->mmchip.gc.direction_output	= altera_gpio_direction_output;
285	altera_gc->mmchip.gc.get		= altera_gpio_get;
286	altera_gc->mmchip.gc.set		= altera_gpio_set;
287	altera_gc->mmchip.gc.owner		= THIS_MODULE;
288	altera_gc->mmchip.gc.parent		= &pdev->dev;
289
290	ret = of_mm_gpiochip_add_data(node, &altera_gc->mmchip, altera_gc);
291	if (ret) {
292		dev_err(&pdev->dev, "Failed adding memory mapped gpiochip\n");
293		return ret;
294	}
295
296	platform_set_drvdata(pdev, altera_gc);
 
 
297
298	altera_gc->mapped_irq = platform_get_irq(pdev, 0);
 
 
299
 
300	if (altera_gc->mapped_irq < 0)
301		goto skip_irq;
302
303	if (of_property_read_u32(node, "altr,interrupt-type", &reg)) {
304		ret = -EINVAL;
305		dev_err(&pdev->dev,
306			"altr,interrupt-type value not set in device tree\n");
307		goto teardown;
308	}
309	altera_gc->interrupt_trigger = reg;
310
311	ret = gpiochip_irqchip_add(&altera_gc->mmchip.gc, &altera_irq_chip, 0,
312		handle_simple_irq, IRQ_TYPE_NONE);
313
314	if (ret) {
315		dev_err(&pdev->dev, "could not add irqchip\n");
316		goto teardown;
317	}
318
319	gpiochip_set_chained_irqchip(&altera_gc->mmchip.gc,
320		&altera_irq_chip,
321		altera_gc->mapped_irq,
322		altera_gc->interrupt_trigger == IRQ_TYPE_LEVEL_HIGH ?
323		altera_gpio_irq_leveL_high_handler :
324		altera_gpio_irq_edge_handler);
 
 
 
 
 
 
325
326skip_irq:
327	return 0;
328teardown:
329	of_mm_gpiochip_remove(&altera_gc->mmchip);
330	pr_err("%s: registration failed with status %d\n",
331		node->full_name, ret);
332
333	return ret;
334}
335
336static int altera_gpio_remove(struct platform_device *pdev)
337{
338	struct altera_gpio_chip *altera_gc = platform_get_drvdata(pdev);
339
340	of_mm_gpiochip_remove(&altera_gc->mmchip);
341
342	return 0;
343}
344
345static const struct of_device_id altera_gpio_of_match[] = {
346	{ .compatible = "altr,pio-1.0", },
347	{},
348};
349MODULE_DEVICE_TABLE(of, altera_gpio_of_match);
350
351static struct platform_driver altera_gpio_driver = {
352	.driver = {
353		.name	= "altera_gpio",
354		.of_match_table = of_match_ptr(altera_gpio_of_match),
355	},
356	.probe		= altera_gpio_probe,
357	.remove		= altera_gpio_remove,
358};
359
360static int __init altera_gpio_init(void)
361{
362	return platform_driver_register(&altera_gpio_driver);
363}
364subsys_initcall(altera_gpio_init);
365
366static void __exit altera_gpio_exit(void)
367{
368	platform_driver_unregister(&altera_gpio_driver);
369}
370module_exit(altera_gpio_exit);
371
372MODULE_AUTHOR("Tien Hock Loh <thloh@altera.com>");
373MODULE_DESCRIPTION("Altera GPIO driver");
374MODULE_LICENSE("GPL");
v6.13.7
  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * Copyright (C) 2013 Altera Corporation
  4 * Based on gpio-mpc8xxx.c
 
 
 
 
 
 
 
 
 
 
 
 
 
  5 */
  6
  7#include <linux/bitops.h>
  8#include <linux/device.h>
  9#include <linux/err.h>
 10#include <linux/io.h>
 11#include <linux/irq.h>
 12#include <linux/mod_devicetable.h>
 13#include <linux/module.h>
 14#include <linux/platform_device.h>
 15#include <linux/property.h>
 16#include <linux/spinlock.h>
 17#include <linux/types.h>
 18
 19#include <linux/gpio/driver.h>
 20
 21#define ALTERA_GPIO_MAX_NGPIO		32
 22#define ALTERA_GPIO_DATA		0x0
 23#define ALTERA_GPIO_DIR			0x4
 24#define ALTERA_GPIO_IRQ_MASK		0x8
 25#define ALTERA_GPIO_EDGE_CAP		0xc
 26
 27/**
 28* struct altera_gpio_chip
 29* @gc			: GPIO chip structure.
 30* @regs			: memory mapped IO address for the controller registers.
 31* @gpio_lock		: synchronization lock so that new irq/set/get requests
 32*			  will be blocked until the current one completes.
 33* @interrupt_trigger	: specifies the hardware configured IRQ trigger type
 34*			  (rising, falling, both, high)
 35* @mapped_irq		: kernel mapped irq number.
 36*/
 37struct altera_gpio_chip {
 38	struct gpio_chip gc;
 39	void __iomem *regs;
 40	raw_spinlock_t gpio_lock;
 41	int interrupt_trigger;
 42	int mapped_irq;
 43};
 44
 45static void altera_gpio_irq_unmask(struct irq_data *d)
 46{
 47	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 48	struct altera_gpio_chip *altera_gc = gpiochip_get_data(gc);
 49	unsigned long flags;
 50	u32 intmask;
 51
 52	gpiochip_enable_irq(gc, irqd_to_hwirq(d));
 
 53
 54	raw_spin_lock_irqsave(&altera_gc->gpio_lock, flags);
 55	intmask = readl(altera_gc->regs + ALTERA_GPIO_IRQ_MASK);
 56	/* Set ALTERA_GPIO_IRQ_MASK bit to unmask */
 57	intmask |= BIT(irqd_to_hwirq(d));
 58	writel(intmask, altera_gc->regs + ALTERA_GPIO_IRQ_MASK);
 59	raw_spin_unlock_irqrestore(&altera_gc->gpio_lock, flags);
 60}
 61
 62static void altera_gpio_irq_mask(struct irq_data *d)
 63{
 64	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 65	struct altera_gpio_chip *altera_gc = gpiochip_get_data(gc);
 66	unsigned long flags;
 67	u32 intmask;
 68
 69	raw_spin_lock_irqsave(&altera_gc->gpio_lock, flags);
 70	intmask = readl(altera_gc->regs + ALTERA_GPIO_IRQ_MASK);
 
 
 
 71	/* Clear ALTERA_GPIO_IRQ_MASK bit to mask */
 72	intmask &= ~BIT(irqd_to_hwirq(d));
 73	writel(intmask, altera_gc->regs + ALTERA_GPIO_IRQ_MASK);
 74	raw_spin_unlock_irqrestore(&altera_gc->gpio_lock, flags);
 75
 76	gpiochip_disable_irq(gc, irqd_to_hwirq(d));
 77}
 78
 79/*
 80 * This controller's IRQ type is synthesized in hardware, so this function
 81 * just checks if the requested set_type matches the synthesized IRQ type
 82 */
 83static int altera_gpio_irq_set_type(struct irq_data *d,
 84				   unsigned int type)
 85{
 86	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 87	struct altera_gpio_chip *altera_gc = gpiochip_get_data(gc);
 
 88
 89	if (type == IRQ_TYPE_NONE) {
 90		irq_set_handler_locked(d, handle_bad_irq);
 
 
 91		return 0;
 92	}
 93	if (type == altera_gc->interrupt_trigger) {
 94		if (type == IRQ_TYPE_LEVEL_HIGH)
 95			irq_set_handler_locked(d, handle_level_irq);
 96		else
 97			irq_set_handler_locked(d, handle_simple_irq);
 
 
 98		return 0;
 99	}
100	irq_set_handler_locked(d, handle_bad_irq);
101	return -EINVAL;
102}
103
104static unsigned int altera_gpio_irq_startup(struct irq_data *d)
105{
106	altera_gpio_irq_unmask(d);
107
108	return 0;
109}
110
 
 
 
 
 
 
 
 
 
111static int altera_gpio_get(struct gpio_chip *gc, unsigned offset)
112{
113	struct altera_gpio_chip *altera_gc = gpiochip_get_data(gc);
 
 
114
115	return !!(readl(altera_gc->regs + ALTERA_GPIO_DATA) & BIT(offset));
116}
117
118static void altera_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
119{
120	struct altera_gpio_chip *altera_gc = gpiochip_get_data(gc);
 
121	unsigned long flags;
122	unsigned int data_reg;
123
124	raw_spin_lock_irqsave(&altera_gc->gpio_lock, flags);
125	data_reg = readl(altera_gc->regs + ALTERA_GPIO_DATA);
 
 
 
126	if (value)
127		data_reg |= BIT(offset);
128	else
129		data_reg &= ~BIT(offset);
130	writel(data_reg, altera_gc->regs + ALTERA_GPIO_DATA);
131	raw_spin_unlock_irqrestore(&altera_gc->gpio_lock, flags);
132}
133
134static int altera_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
135{
136	struct altera_gpio_chip *altera_gc = gpiochip_get_data(gc);
 
137	unsigned long flags;
138	unsigned int gpio_ddr;
139
140	raw_spin_lock_irqsave(&altera_gc->gpio_lock, flags);
 
 
 
141	/* Set pin as input, assumes software controlled IP */
142	gpio_ddr = readl(altera_gc->regs + ALTERA_GPIO_DIR);
143	gpio_ddr &= ~BIT(offset);
144	writel(gpio_ddr, altera_gc->regs + ALTERA_GPIO_DIR);
145	raw_spin_unlock_irqrestore(&altera_gc->gpio_lock, flags);
146
147	return 0;
148}
149
150static int altera_gpio_direction_output(struct gpio_chip *gc,
151		unsigned offset, int value)
152{
153	struct altera_gpio_chip *altera_gc = gpiochip_get_data(gc);
 
154	unsigned long flags;
155	unsigned int data_reg, gpio_ddr;
156
157	raw_spin_lock_irqsave(&altera_gc->gpio_lock, flags);
 
 
 
158	/* Sets the GPIO value */
159	data_reg = readl(altera_gc->regs + ALTERA_GPIO_DATA);
160	if (value)
161		data_reg |= BIT(offset);
162	else
163		data_reg &= ~BIT(offset);
164	writel(data_reg, altera_gc->regs + ALTERA_GPIO_DATA);
165
166	/* Set pin as output, assumes software controlled IP */
167	gpio_ddr = readl(altera_gc->regs + ALTERA_GPIO_DIR);
168	gpio_ddr |= BIT(offset);
169	writel(gpio_ddr, altera_gc->regs + ALTERA_GPIO_DIR);
170	raw_spin_unlock_irqrestore(&altera_gc->gpio_lock, flags);
171
172	return 0;
173}
174
175static void altera_gpio_irq_edge_handler(struct irq_desc *desc)
176{
177	struct gpio_chip *gc = irq_desc_get_handler_data(desc);
178	struct altera_gpio_chip *altera_gc = gpiochip_get_data(gc);
179	struct irq_domain *irqdomain = gc->irq.domain;
180	struct irq_chip *chip;
 
 
181	unsigned long status;
182	int i;
183
 
184	chip = irq_desc_get_chip(desc);
 
 
185
186	chained_irq_enter(chip, desc);
187
188	while ((status =
189	        (readl(altera_gc->regs + ALTERA_GPIO_EDGE_CAP) &
190	         readl(altera_gc->regs + ALTERA_GPIO_IRQ_MASK)))) {
191		writel(status, altera_gc->regs + ALTERA_GPIO_EDGE_CAP);
192		for_each_set_bit(i, &status, gc->ngpio)
193			generic_handle_domain_irq(irqdomain, i);
 
194	}
195
196	chained_irq_exit(chip, desc);
197}
198
 
199static void altera_gpio_irq_leveL_high_handler(struct irq_desc *desc)
200{
201	struct gpio_chip *gc = irq_desc_get_handler_data(desc);
202	struct altera_gpio_chip *altera_gc = gpiochip_get_data(gc);
203	struct irq_domain *irqdomain = gc->irq.domain;
204	struct irq_chip *chip;
 
 
205	unsigned long status;
206	int i;
207
 
208	chip = irq_desc_get_chip(desc);
 
 
209
210	chained_irq_enter(chip, desc);
211
212	status = readl(altera_gc->regs + ALTERA_GPIO_DATA);
213	status &= readl(altera_gc->regs + ALTERA_GPIO_IRQ_MASK);
214
215	for_each_set_bit(i, &status, gc->ngpio)
216		generic_handle_domain_irq(irqdomain, i);
217
 
 
 
218	chained_irq_exit(chip, desc);
219}
220
221static const struct irq_chip altera_gpio_irq_chip = {
222	.name = "altera-gpio",
223	.irq_mask = altera_gpio_irq_mask,
224	.irq_unmask = altera_gpio_irq_unmask,
225	.irq_set_type = altera_gpio_irq_set_type,
226	.irq_startup  = altera_gpio_irq_startup,
227	.irq_shutdown = altera_gpio_irq_mask,
228	.flags = IRQCHIP_IMMUTABLE,
229	GPIOCHIP_IRQ_RESOURCE_HELPERS,
230};
231
232static int altera_gpio_probe(struct platform_device *pdev)
233{
234	struct device *dev = &pdev->dev;
235	int reg, ret;
236	struct altera_gpio_chip *altera_gc;
237	struct gpio_irq_chip *girq;
238
239	altera_gc = devm_kzalloc(&pdev->dev, sizeof(*altera_gc), GFP_KERNEL);
240	if (!altera_gc)
241		return -ENOMEM;
242
243	raw_spin_lock_init(&altera_gc->gpio_lock);
244
245	if (device_property_read_u32(dev, "altr,ngpio", &reg))
246		/* By default assume maximum ngpio */
247		altera_gc->gc.ngpio = ALTERA_GPIO_MAX_NGPIO;
248	else
249		altera_gc->gc.ngpio = reg;
250
251	if (altera_gc->gc.ngpio > ALTERA_GPIO_MAX_NGPIO) {
252		dev_warn(&pdev->dev,
253			"ngpio is greater than %d, defaulting to %d\n",
254			ALTERA_GPIO_MAX_NGPIO, ALTERA_GPIO_MAX_NGPIO);
255		altera_gc->gc.ngpio = ALTERA_GPIO_MAX_NGPIO;
256	}
257
258	altera_gc->gc.direction_input	= altera_gpio_direction_input;
259	altera_gc->gc.direction_output	= altera_gpio_direction_output;
260	altera_gc->gc.get		= altera_gpio_get;
261	altera_gc->gc.set		= altera_gpio_set;
262	altera_gc->gc.owner		= THIS_MODULE;
263	altera_gc->gc.parent		= &pdev->dev;
264	altera_gc->gc.base		= -1;
 
 
 
 
 
265
266	altera_gc->gc.label = devm_kasprintf(dev, GFP_KERNEL, "%pfw", dev_fwnode(dev));
267	if (!altera_gc->gc.label)
268		return -ENOMEM;
269
270	altera_gc->regs = devm_platform_ioremap_resource(pdev, 0);
271	if (IS_ERR(altera_gc->regs))
272		return dev_err_probe(dev, PTR_ERR(altera_gc->regs), "failed to ioremap memory resource\n");
273
274	altera_gc->mapped_irq = platform_get_irq_optional(pdev, 0);
275	if (altera_gc->mapped_irq < 0)
276		goto skip_irq;
277
278	if (device_property_read_u32(dev, "altr,interrupt-type", &reg)) {
 
279		dev_err(&pdev->dev,
280			"altr,interrupt-type value not set in device tree\n");
281		return -EINVAL;
282	}
283	altera_gc->interrupt_trigger = reg;
284
285	girq = &altera_gc->gc.irq;
286	gpio_irq_chip_set_chip(girq, &altera_gpio_irq_chip);
 
 
 
 
 
287
288	if (altera_gc->interrupt_trigger == IRQ_TYPE_LEVEL_HIGH)
289		girq->parent_handler = altera_gpio_irq_leveL_high_handler;
290	else
291		girq->parent_handler = altera_gpio_irq_edge_handler;
292	girq->num_parents = 1;
293	girq->parents = devm_kcalloc(&pdev->dev, 1, sizeof(*girq->parents),
294				     GFP_KERNEL);
295	if (!girq->parents)
296		return -ENOMEM;
297	girq->default_type = IRQ_TYPE_NONE;
298	girq->handler = handle_bad_irq;
299	girq->parents[0] = altera_gc->mapped_irq;
300
301skip_irq:
302	ret = devm_gpiochip_add_data(dev, &altera_gc->gc, altera_gc);
303	if (ret) {
304		dev_err(&pdev->dev, "Failed adding memory mapped gpiochip\n");
305		return ret;
306	}
 
 
 
 
 
 
 
 
 
307
308	return 0;
309}
310
311static const struct of_device_id altera_gpio_of_match[] = {
312	{ .compatible = "altr,pio-1.0", },
313	{},
314};
315MODULE_DEVICE_TABLE(of, altera_gpio_of_match);
316
317static struct platform_driver altera_gpio_driver = {
318	.driver = {
319		.name	= "altera_gpio",
320		.of_match_table = altera_gpio_of_match,
321	},
322	.probe		= altera_gpio_probe,
 
323};
324
325static int __init altera_gpio_init(void)
326{
327	return platform_driver_register(&altera_gpio_driver);
328}
329subsys_initcall(altera_gpio_init);
330
331static void __exit altera_gpio_exit(void)
332{
333	platform_driver_unregister(&altera_gpio_driver);
334}
335module_exit(altera_gpio_exit);
336
337MODULE_AUTHOR("Tien Hock Loh <thloh@altera.com>");
338MODULE_DESCRIPTION("Altera GPIO driver");
339MODULE_LICENSE("GPL");