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Tien Hock Lohc5abbba2015-02-24 01:53:03 -08001/*
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>
Paul Gortmaker7b5409e2016-09-12 18:16:27 -040020#include <linux/module.h>
Tien Hock Lohc5abbba2015-02-24 01:53:03 -080021#include <linux/of_gpio.h>
22#include <linux/platform_device.h>
23
24#define ALTERA_GPIO_MAX_NGPIO 32
25#define ALTERA_GPIO_DATA 0x0
26#define ALTERA_GPIO_DIR 0x4
27#define ALTERA_GPIO_IRQ_MASK 0x8
28#define ALTERA_GPIO_EDGE_CAP 0xc
29
30/**
31* struct altera_gpio_chip
32* @mmchip : memory mapped chip structure.
33* @gpio_lock : synchronization lock so that new irq/set/get requests
34 will be blocked until the current one completes.
35* @interrupt_trigger : specifies the hardware configured IRQ trigger type
36 (rising, falling, both, high)
37* @mapped_irq : kernel mapped irq number.
38*/
39struct altera_gpio_chip {
40 struct of_mm_gpio_chip mmchip;
41 spinlock_t gpio_lock;
42 int interrupt_trigger;
43 int mapped_irq;
44};
45
46static void altera_gpio_irq_unmask(struct irq_data *d)
47{
48 struct altera_gpio_chip *altera_gc;
49 struct of_mm_gpio_chip *mm_gc;
50 unsigned long flags;
51 u32 intmask;
52
Linus Walleij397d0772015-12-04 15:16:43 +010053 altera_gc = gpiochip_get_data(irq_data_get_irq_chip_data(d));
Tien Hock Lohc5abbba2015-02-24 01:53:03 -080054 mm_gc = &altera_gc->mmchip;
55
56 spin_lock_irqsave(&altera_gc->gpio_lock, flags);
57 intmask = readl(mm_gc->regs + ALTERA_GPIO_IRQ_MASK);
58 /* Set ALTERA_GPIO_IRQ_MASK bit to unmask */
59 intmask |= BIT(irqd_to_hwirq(d));
60 writel(intmask, mm_gc->regs + ALTERA_GPIO_IRQ_MASK);
61 spin_unlock_irqrestore(&altera_gc->gpio_lock, flags);
62}
63
64static void altera_gpio_irq_mask(struct irq_data *d)
65{
66 struct altera_gpio_chip *altera_gc;
67 struct of_mm_gpio_chip *mm_gc;
68 unsigned long flags;
69 u32 intmask;
70
Linus Walleij397d0772015-12-04 15:16:43 +010071 altera_gc = gpiochip_get_data(irq_data_get_irq_chip_data(d));
Tien Hock Lohc5abbba2015-02-24 01:53:03 -080072 mm_gc = &altera_gc->mmchip;
73
74 spin_lock_irqsave(&altera_gc->gpio_lock, flags);
75 intmask = readl(mm_gc->regs + ALTERA_GPIO_IRQ_MASK);
76 /* Clear ALTERA_GPIO_IRQ_MASK bit to mask */
77 intmask &= ~BIT(irqd_to_hwirq(d));
78 writel(intmask, mm_gc->regs + ALTERA_GPIO_IRQ_MASK);
79 spin_unlock_irqrestore(&altera_gc->gpio_lock, flags);
80}
81
82/**
83 * This controller's IRQ type is synthesized in hardware, so this function
84 * just checks if the requested set_type matches the synthesized IRQ type
85 */
86static int altera_gpio_irq_set_type(struct irq_data *d,
87 unsigned int type)
88{
89 struct altera_gpio_chip *altera_gc;
90
Linus Walleij397d0772015-12-04 15:16:43 +010091 altera_gc = gpiochip_get_data(irq_data_get_irq_chip_data(d));
Tien Hock Lohc5abbba2015-02-24 01:53:03 -080092
93 if (type == IRQ_TYPE_NONE)
94 return 0;
95 if (type == IRQ_TYPE_LEVEL_HIGH &&
96 altera_gc->interrupt_trigger == IRQ_TYPE_LEVEL_HIGH)
97 return 0;
98 if (type == IRQ_TYPE_EDGE_RISING &&
99 altera_gc->interrupt_trigger == IRQ_TYPE_EDGE_RISING)
100 return 0;
101 if (type == IRQ_TYPE_EDGE_FALLING &&
102 altera_gc->interrupt_trigger == IRQ_TYPE_EDGE_FALLING)
103 return 0;
104 if (type == IRQ_TYPE_EDGE_BOTH &&
105 altera_gc->interrupt_trigger == IRQ_TYPE_EDGE_BOTH)
106 return 0;
107
108 return -EINVAL;
109}
110
Daniel Lockyer38e003f2015-06-10 14:26:27 +0100111static unsigned int altera_gpio_irq_startup(struct irq_data *d)
112{
Tien Hock Lohc5abbba2015-02-24 01:53:03 -0800113 altera_gpio_irq_unmask(d);
114
115 return 0;
116}
117
118static struct irq_chip altera_irq_chip = {
119 .name = "altera-gpio",
120 .irq_mask = altera_gpio_irq_mask,
121 .irq_unmask = altera_gpio_irq_unmask,
122 .irq_set_type = altera_gpio_irq_set_type,
123 .irq_startup = altera_gpio_irq_startup,
124 .irq_shutdown = altera_gpio_irq_mask,
125};
126
127static int altera_gpio_get(struct gpio_chip *gc, unsigned offset)
128{
129 struct of_mm_gpio_chip *mm_gc;
130
131 mm_gc = to_of_mm_gpio_chip(gc);
132
133 return !!(readl(mm_gc->regs + ALTERA_GPIO_DATA) & BIT(offset));
134}
135
136static void altera_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
137{
138 struct of_mm_gpio_chip *mm_gc;
139 struct altera_gpio_chip *chip;
140 unsigned long flags;
141 unsigned int data_reg;
142
143 mm_gc = to_of_mm_gpio_chip(gc);
Linus Walleij397d0772015-12-04 15:16:43 +0100144 chip = gpiochip_get_data(gc);
Tien Hock Lohc5abbba2015-02-24 01:53:03 -0800145
146 spin_lock_irqsave(&chip->gpio_lock, flags);
147 data_reg = readl(mm_gc->regs + ALTERA_GPIO_DATA);
148 if (value)
149 data_reg |= BIT(offset);
150 else
151 data_reg &= ~BIT(offset);
152 writel(data_reg, mm_gc->regs + ALTERA_GPIO_DATA);
153 spin_unlock_irqrestore(&chip->gpio_lock, flags);
154}
155
156static int altera_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
157{
158 struct of_mm_gpio_chip *mm_gc;
159 struct altera_gpio_chip *chip;
160 unsigned long flags;
161 unsigned int gpio_ddr;
162
163 mm_gc = to_of_mm_gpio_chip(gc);
Linus Walleij397d0772015-12-04 15:16:43 +0100164 chip = gpiochip_get_data(gc);
Tien Hock Lohc5abbba2015-02-24 01:53:03 -0800165
166 spin_lock_irqsave(&chip->gpio_lock, flags);
167 /* Set pin as input, assumes software controlled IP */
168 gpio_ddr = readl(mm_gc->regs + ALTERA_GPIO_DIR);
169 gpio_ddr &= ~BIT(offset);
170 writel(gpio_ddr, mm_gc->regs + ALTERA_GPIO_DIR);
171 spin_unlock_irqrestore(&chip->gpio_lock, flags);
172
173 return 0;
174}
175
176static int altera_gpio_direction_output(struct gpio_chip *gc,
177 unsigned offset, int value)
178{
179 struct of_mm_gpio_chip *mm_gc;
180 struct altera_gpio_chip *chip;
181 unsigned long flags;
182 unsigned int data_reg, gpio_ddr;
183
184 mm_gc = to_of_mm_gpio_chip(gc);
Linus Walleij397d0772015-12-04 15:16:43 +0100185 chip = gpiochip_get_data(gc);
Tien Hock Lohc5abbba2015-02-24 01:53:03 -0800186
187 spin_lock_irqsave(&chip->gpio_lock, flags);
188 /* Sets the GPIO value */
189 data_reg = readl(mm_gc->regs + ALTERA_GPIO_DATA);
190 if (value)
191 data_reg |= BIT(offset);
192 else
193 data_reg &= ~BIT(offset);
194 writel(data_reg, mm_gc->regs + ALTERA_GPIO_DATA);
195
196 /* Set pin as output, assumes software controlled IP */
197 gpio_ddr = readl(mm_gc->regs + ALTERA_GPIO_DIR);
198 gpio_ddr |= BIT(offset);
199 writel(gpio_ddr, mm_gc->regs + ALTERA_GPIO_DIR);
200 spin_unlock_irqrestore(&chip->gpio_lock, flags);
201
202 return 0;
203}
204
Thomas Gleixnerbd0b9ac2015-09-14 10:42:37 +0200205static void altera_gpio_irq_edge_handler(struct irq_desc *desc)
Tien Hock Lohc5abbba2015-02-24 01:53:03 -0800206{
207 struct altera_gpio_chip *altera_gc;
208 struct irq_chip *chip;
209 struct of_mm_gpio_chip *mm_gc;
210 struct irq_domain *irqdomain;
211 unsigned long status;
212 int i;
213
Linus Walleij397d0772015-12-04 15:16:43 +0100214 altera_gc = gpiochip_get_data(irq_desc_get_handler_data(desc));
Tien Hock Lohc5abbba2015-02-24 01:53:03 -0800215 chip = irq_desc_get_chip(desc);
216 mm_gc = &altera_gc->mmchip;
217 irqdomain = altera_gc->mmchip.gc.irqdomain;
218
219 chained_irq_enter(chip, desc);
220
221 while ((status =
222 (readl(mm_gc->regs + ALTERA_GPIO_EDGE_CAP) &
223 readl(mm_gc->regs + ALTERA_GPIO_IRQ_MASK)))) {
224 writel(status, mm_gc->regs + ALTERA_GPIO_EDGE_CAP);
225 for_each_set_bit(i, &status, mm_gc->gc.ngpio) {
226 generic_handle_irq(irq_find_mapping(irqdomain, i));
227 }
228 }
229
230 chained_irq_exit(chip, desc);
231}
232
233
Thomas Gleixnerbd0b9ac2015-09-14 10:42:37 +0200234static void altera_gpio_irq_leveL_high_handler(struct irq_desc *desc)
Tien Hock Lohc5abbba2015-02-24 01:53:03 -0800235{
236 struct altera_gpio_chip *altera_gc;
237 struct irq_chip *chip;
238 struct of_mm_gpio_chip *mm_gc;
239 struct irq_domain *irqdomain;
240 unsigned long status;
241 int i;
242
Linus Walleij397d0772015-12-04 15:16:43 +0100243 altera_gc = gpiochip_get_data(irq_desc_get_handler_data(desc));
Tien Hock Lohc5abbba2015-02-24 01:53:03 -0800244 chip = irq_desc_get_chip(desc);
245 mm_gc = &altera_gc->mmchip;
246 irqdomain = altera_gc->mmchip.gc.irqdomain;
247
248 chained_irq_enter(chip, desc);
249
250 status = readl(mm_gc->regs + ALTERA_GPIO_DATA);
251 status &= readl(mm_gc->regs + ALTERA_GPIO_IRQ_MASK);
252
253 for_each_set_bit(i, &status, mm_gc->gc.ngpio) {
254 generic_handle_irq(irq_find_mapping(irqdomain, i));
255 }
256 chained_irq_exit(chip, desc);
257}
258
kbuild test robotc4b40492015-03-19 17:40:02 +0800259static int altera_gpio_probe(struct platform_device *pdev)
Tien Hock Lohc5abbba2015-02-24 01:53:03 -0800260{
261 struct device_node *node = pdev->dev.of_node;
262 int reg, ret;
263 struct altera_gpio_chip *altera_gc;
264
265 altera_gc = devm_kzalloc(&pdev->dev, sizeof(*altera_gc), GFP_KERNEL);
266 if (!altera_gc)
267 return -ENOMEM;
268
269 spin_lock_init(&altera_gc->gpio_lock);
270
271 if (of_property_read_u32(node, "altr,ngpio", &reg))
272 /* By default assume maximum ngpio */
273 altera_gc->mmchip.gc.ngpio = ALTERA_GPIO_MAX_NGPIO;
274 else
275 altera_gc->mmchip.gc.ngpio = reg;
276
277 if (altera_gc->mmchip.gc.ngpio > ALTERA_GPIO_MAX_NGPIO) {
278 dev_warn(&pdev->dev,
279 "ngpio is greater than %d, defaulting to %d\n",
280 ALTERA_GPIO_MAX_NGPIO, ALTERA_GPIO_MAX_NGPIO);
281 altera_gc->mmchip.gc.ngpio = ALTERA_GPIO_MAX_NGPIO;
282 }
283
284 altera_gc->mmchip.gc.direction_input = altera_gpio_direction_input;
285 altera_gc->mmchip.gc.direction_output = altera_gpio_direction_output;
286 altera_gc->mmchip.gc.get = altera_gpio_get;
287 altera_gc->mmchip.gc.set = altera_gpio_set;
288 altera_gc->mmchip.gc.owner = THIS_MODULE;
Linus Walleij58383c782015-11-04 09:56:26 +0100289 altera_gc->mmchip.gc.parent = &pdev->dev;
Tien Hock Lohc5abbba2015-02-24 01:53:03 -0800290
Linus Walleij397d0772015-12-04 15:16:43 +0100291 ret = of_mm_gpiochip_add_data(node, &altera_gc->mmchip, altera_gc);
Tien Hock Lohc5abbba2015-02-24 01:53:03 -0800292 if (ret) {
293 dev_err(&pdev->dev, "Failed adding memory mapped gpiochip\n");
294 return ret;
295 }
296
297 platform_set_drvdata(pdev, altera_gc);
298
299 altera_gc->mapped_irq = platform_get_irq(pdev, 0);
300
301 if (altera_gc->mapped_irq < 0)
302 goto skip_irq;
303
304 if (of_property_read_u32(node, "altr,interrupt-type", &reg)) {
305 ret = -EINVAL;
306 dev_err(&pdev->dev,
307 "altr,interrupt-type value not set in device tree\n");
308 goto teardown;
309 }
310 altera_gc->interrupt_trigger = reg;
311
312 ret = gpiochip_irqchip_add(&altera_gc->mmchip.gc, &altera_irq_chip, 0,
313 handle_simple_irq, IRQ_TYPE_NONE);
314
315 if (ret) {
Phil Reid73c13c82016-01-15 11:32:22 +0800316 dev_err(&pdev->dev, "could not add irqchip\n");
317 goto teardown;
Tien Hock Lohc5abbba2015-02-24 01:53:03 -0800318 }
319
320 gpiochip_set_chained_irqchip(&altera_gc->mmchip.gc,
321 &altera_irq_chip,
322 altera_gc->mapped_irq,
323 altera_gc->interrupt_trigger == IRQ_TYPE_LEVEL_HIGH ?
324 altera_gpio_irq_leveL_high_handler :
325 altera_gpio_irq_edge_handler);
326
327skip_irq:
328 return 0;
329teardown:
Phil Reid73c13c82016-01-15 11:32:22 +0800330 of_mm_gpiochip_remove(&altera_gc->mmchip);
Tien Hock Lohc5abbba2015-02-24 01:53:03 -0800331 pr_err("%s: registration failed with status %d\n",
332 node->full_name, ret);
333
334 return ret;
335}
336
337static int altera_gpio_remove(struct platform_device *pdev)
338{
339 struct altera_gpio_chip *altera_gc = platform_get_drvdata(pdev);
340
Masahiro Yamada41ec66c2015-06-17 20:59:42 +0900341 of_mm_gpiochip_remove(&altera_gc->mmchip);
Tien Hock Lohc5abbba2015-02-24 01:53:03 -0800342
Masahiro Yamada1c8b5d62015-06-17 20:59:43 +0900343 return 0;
Tien Hock Lohc5abbba2015-02-24 01:53:03 -0800344}
345
346static const struct of_device_id altera_gpio_of_match[] = {
347 { .compatible = "altr,pio-1.0", },
348 {},
349};
350MODULE_DEVICE_TABLE(of, altera_gpio_of_match);
351
352static struct platform_driver altera_gpio_driver = {
353 .driver = {
354 .name = "altera_gpio",
355 .of_match_table = of_match_ptr(altera_gpio_of_match),
356 },
357 .probe = altera_gpio_probe,
358 .remove = altera_gpio_remove,
359};
360
361static int __init altera_gpio_init(void)
362{
363 return platform_driver_register(&altera_gpio_driver);
364}
365subsys_initcall(altera_gpio_init);
366
367static void __exit altera_gpio_exit(void)
368{
369 platform_driver_unregister(&altera_gpio_driver);
370}
371module_exit(altera_gpio_exit);
372
373MODULE_AUTHOR("Tien Hock Loh <thloh@altera.com>");
374MODULE_DESCRIPTION("Altera GPIO driver");
375MODULE_LICENSE("GPL");