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1/*
2 * Copyright (C) ST-Ericsson SA 2010
3 *
4 * License Terms: GNU General Public License, version 2
5 * Author: Hanumath Prasad <hanumath.prasad@stericsson.com> for ST-Ericsson
6 * Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
7 */
8
9#include <linux/module.h>
10#include <linux/init.h>
11#include <linux/platform_device.h>
12#include <linux/slab.h>
13#include <linux/gpio.h>
14#include <linux/irq.h>
15#include <linux/interrupt.h>
16#include <linux/mfd/tc3589x.h>
17
18/*
19 * These registers are modified under the irq bus lock and cached to avoid
20 * unnecessary writes in bus_sync_unlock.
21 */
22enum { REG_IBE, REG_IEV, REG_IS, REG_IE };
23
24#define CACHE_NR_REGS 4
25#define CACHE_NR_BANKS 3
26
27struct tc3589x_gpio {
28 struct gpio_chip chip;
29 struct tc3589x *tc3589x;
30 struct device *dev;
31 struct mutex irq_lock;
32
33 int irq_base;
34
35 /* Caches of interrupt control registers for bus_lock */
36 u8 regs[CACHE_NR_REGS][CACHE_NR_BANKS];
37 u8 oldregs[CACHE_NR_REGS][CACHE_NR_BANKS];
38};
39
40static inline struct tc3589x_gpio *to_tc3589x_gpio(struct gpio_chip *chip)
41{
42 return container_of(chip, struct tc3589x_gpio, chip);
43}
44
45static int tc3589x_gpio_get(struct gpio_chip *chip, unsigned offset)
46{
47 struct tc3589x_gpio *tc3589x_gpio = to_tc3589x_gpio(chip);
48 struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
49 u8 reg = TC3589x_GPIODATA0 + (offset / 8) * 2;
50 u8 mask = 1 << (offset % 8);
51 int ret;
52
53 ret = tc3589x_reg_read(tc3589x, reg);
54 if (ret < 0)
55 return ret;
56
57 return ret & mask;
58}
59
60static void tc3589x_gpio_set(struct gpio_chip *chip, unsigned offset, int val)
61{
62 struct tc3589x_gpio *tc3589x_gpio = to_tc3589x_gpio(chip);
63 struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
64 u8 reg = TC3589x_GPIODATA0 + (offset / 8) * 2;
65 unsigned pos = offset % 8;
66 u8 data[] = {!!val << pos, 1 << pos};
67
68 tc3589x_block_write(tc3589x, reg, ARRAY_SIZE(data), data);
69}
70
71static int tc3589x_gpio_direction_output(struct gpio_chip *chip,
72 unsigned offset, int val)
73{
74 struct tc3589x_gpio *tc3589x_gpio = to_tc3589x_gpio(chip);
75 struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
76 u8 reg = TC3589x_GPIODIR0 + offset / 8;
77 unsigned pos = offset % 8;
78
79 tc3589x_gpio_set(chip, offset, val);
80
81 return tc3589x_set_bits(tc3589x, reg, 1 << pos, 1 << pos);
82}
83
84static int tc3589x_gpio_direction_input(struct gpio_chip *chip,
85 unsigned offset)
86{
87 struct tc3589x_gpio *tc3589x_gpio = to_tc3589x_gpio(chip);
88 struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
89 u8 reg = TC3589x_GPIODIR0 + offset / 8;
90 unsigned pos = offset % 8;
91
92 return tc3589x_set_bits(tc3589x, reg, 1 << pos, 0);
93}
94
95static int tc3589x_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
96{
97 struct tc3589x_gpio *tc3589x_gpio = to_tc3589x_gpio(chip);
98
99 return tc3589x_gpio->irq_base + offset;
100}
101
102static struct gpio_chip template_chip = {
103 .label = "tc3589x",
104 .owner = THIS_MODULE,
105 .direction_input = tc3589x_gpio_direction_input,
106 .get = tc3589x_gpio_get,
107 .direction_output = tc3589x_gpio_direction_output,
108 .set = tc3589x_gpio_set,
109 .to_irq = tc3589x_gpio_to_irq,
110 .can_sleep = 1,
111};
112
113static int tc3589x_gpio_irq_set_type(struct irq_data *d, unsigned int type)
114{
115 struct tc3589x_gpio *tc3589x_gpio = irq_data_get_irq_chip_data(d);
116 int offset = d->irq - tc3589x_gpio->irq_base;
117 int regoffset = offset / 8;
118 int mask = 1 << (offset % 8);
119
120 if (type == IRQ_TYPE_EDGE_BOTH) {
121 tc3589x_gpio->regs[REG_IBE][regoffset] |= mask;
122 return 0;
123 }
124
125 tc3589x_gpio->regs[REG_IBE][regoffset] &= ~mask;
126
127 if (type == IRQ_TYPE_LEVEL_LOW || type == IRQ_TYPE_LEVEL_HIGH)
128 tc3589x_gpio->regs[REG_IS][regoffset] |= mask;
129 else
130 tc3589x_gpio->regs[REG_IS][regoffset] &= ~mask;
131
132 if (type == IRQ_TYPE_EDGE_RISING || type == IRQ_TYPE_LEVEL_HIGH)
133 tc3589x_gpio->regs[REG_IEV][regoffset] |= mask;
134 else
135 tc3589x_gpio->regs[REG_IEV][regoffset] &= ~mask;
136
137 return 0;
138}
139
140static void tc3589x_gpio_irq_lock(struct irq_data *d)
141{
142 struct tc3589x_gpio *tc3589x_gpio = irq_data_get_irq_chip_data(d);
143
144 mutex_lock(&tc3589x_gpio->irq_lock);
145}
146
147static void tc3589x_gpio_irq_sync_unlock(struct irq_data *d)
148{
149 struct tc3589x_gpio *tc3589x_gpio = irq_data_get_irq_chip_data(d);
150 struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
151 static const u8 regmap[] = {
152 [REG_IBE] = TC3589x_GPIOIBE0,
153 [REG_IEV] = TC3589x_GPIOIEV0,
154 [REG_IS] = TC3589x_GPIOIS0,
155 [REG_IE] = TC3589x_GPIOIE0,
156 };
157 int i, j;
158
159 for (i = 0; i < CACHE_NR_REGS; i++) {
160 for (j = 0; j < CACHE_NR_BANKS; j++) {
161 u8 old = tc3589x_gpio->oldregs[i][j];
162 u8 new = tc3589x_gpio->regs[i][j];
163
164 if (new == old)
165 continue;
166
167 tc3589x_gpio->oldregs[i][j] = new;
168 tc3589x_reg_write(tc3589x, regmap[i] + j * 8, new);
169 }
170 }
171
172 mutex_unlock(&tc3589x_gpio->irq_lock);
173}
174
175static void tc3589x_gpio_irq_mask(struct irq_data *d)
176{
177 struct tc3589x_gpio *tc3589x_gpio = irq_data_get_irq_chip_data(d);
178 int offset = d->irq - tc3589x_gpio->irq_base;
179 int regoffset = offset / 8;
180 int mask = 1 << (offset % 8);
181
182 tc3589x_gpio->regs[REG_IE][regoffset] &= ~mask;
183}
184
185static void tc3589x_gpio_irq_unmask(struct irq_data *d)
186{
187 struct tc3589x_gpio *tc3589x_gpio = irq_data_get_irq_chip_data(d);
188 int offset = d->irq - tc3589x_gpio->irq_base;
189 int regoffset = offset / 8;
190 int mask = 1 << (offset % 8);
191
192 tc3589x_gpio->regs[REG_IE][regoffset] |= mask;
193}
194
195static struct irq_chip tc3589x_gpio_irq_chip = {
196 .name = "tc3589x-gpio",
197 .irq_bus_lock = tc3589x_gpio_irq_lock,
198 .irq_bus_sync_unlock = tc3589x_gpio_irq_sync_unlock,
199 .irq_mask = tc3589x_gpio_irq_mask,
200 .irq_unmask = tc3589x_gpio_irq_unmask,
201 .irq_set_type = tc3589x_gpio_irq_set_type,
202};
203
204static irqreturn_t tc3589x_gpio_irq(int irq, void *dev)
205{
206 struct tc3589x_gpio *tc3589x_gpio = dev;
207 struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
208 u8 status[CACHE_NR_BANKS];
209 int ret;
210 int i;
211
212 ret = tc3589x_block_read(tc3589x, TC3589x_GPIOMIS0,
213 ARRAY_SIZE(status), status);
214 if (ret < 0)
215 return IRQ_NONE;
216
217 for (i = 0; i < ARRAY_SIZE(status); i++) {
218 unsigned int stat = status[i];
219 if (!stat)
220 continue;
221
222 while (stat) {
223 int bit = __ffs(stat);
224 int line = i * 8 + bit;
225
226 handle_nested_irq(tc3589x_gpio->irq_base + line);
227 stat &= ~(1 << bit);
228 }
229
230 tc3589x_reg_write(tc3589x, TC3589x_GPIOIC0 + i, status[i]);
231 }
232
233 return IRQ_HANDLED;
234}
235
236static int tc3589x_gpio_irq_init(struct tc3589x_gpio *tc3589x_gpio)
237{
238 int base = tc3589x_gpio->irq_base;
239 int irq;
240
241 for (irq = base; irq < base + tc3589x_gpio->chip.ngpio; irq++) {
242 irq_set_chip_data(irq, tc3589x_gpio);
243 irq_set_chip_and_handler(irq, &tc3589x_gpio_irq_chip,
244 handle_simple_irq);
245 irq_set_nested_thread(irq, 1);
246#ifdef CONFIG_ARM
247 set_irq_flags(irq, IRQF_VALID);
248#else
249 irq_set_noprobe(irq);
250#endif
251 }
252
253 return 0;
254}
255
256static void tc3589x_gpio_irq_remove(struct tc3589x_gpio *tc3589x_gpio)
257{
258 int base = tc3589x_gpio->irq_base;
259 int irq;
260
261 for (irq = base; irq < base + tc3589x_gpio->chip.ngpio; irq++) {
262#ifdef CONFIG_ARM
263 set_irq_flags(irq, 0);
264#endif
265 irq_set_chip_and_handler(irq, NULL, NULL);
266 irq_set_chip_data(irq, NULL);
267 }
268}
269
270static int __devinit tc3589x_gpio_probe(struct platform_device *pdev)
271{
272 struct tc3589x *tc3589x = dev_get_drvdata(pdev->dev.parent);
273 struct tc3589x_gpio_platform_data *pdata;
274 struct tc3589x_gpio *tc3589x_gpio;
275 int ret;
276 int irq;
277
278 pdata = tc3589x->pdata->gpio;
279 if (!pdata)
280 return -ENODEV;
281
282 irq = platform_get_irq(pdev, 0);
283 if (irq < 0)
284 return irq;
285
286 tc3589x_gpio = kzalloc(sizeof(struct tc3589x_gpio), GFP_KERNEL);
287 if (!tc3589x_gpio)
288 return -ENOMEM;
289
290 mutex_init(&tc3589x_gpio->irq_lock);
291
292 tc3589x_gpio->dev = &pdev->dev;
293 tc3589x_gpio->tc3589x = tc3589x;
294
295 tc3589x_gpio->chip = template_chip;
296 tc3589x_gpio->chip.ngpio = tc3589x->num_gpio;
297 tc3589x_gpio->chip.dev = &pdev->dev;
298 tc3589x_gpio->chip.base = pdata->gpio_base;
299
300 tc3589x_gpio->irq_base = tc3589x->irq_base + TC3589x_INT_GPIO(0);
301
302 /* Bring the GPIO module out of reset */
303 ret = tc3589x_set_bits(tc3589x, TC3589x_RSTCTRL,
304 TC3589x_RSTCTRL_GPIRST, 0);
305 if (ret < 0)
306 goto out_free;
307
308 ret = tc3589x_gpio_irq_init(tc3589x_gpio);
309 if (ret)
310 goto out_free;
311
312 ret = request_threaded_irq(irq, NULL, tc3589x_gpio_irq, IRQF_ONESHOT,
313 "tc3589x-gpio", tc3589x_gpio);
314 if (ret) {
315 dev_err(&pdev->dev, "unable to get irq: %d\n", ret);
316 goto out_removeirq;
317 }
318
319 ret = gpiochip_add(&tc3589x_gpio->chip);
320 if (ret) {
321 dev_err(&pdev->dev, "unable to add gpiochip: %d\n", ret);
322 goto out_freeirq;
323 }
324
325 if (pdata->setup)
326 pdata->setup(tc3589x, tc3589x_gpio->chip.base);
327
328 platform_set_drvdata(pdev, tc3589x_gpio);
329
330 return 0;
331
332out_freeirq:
333 free_irq(irq, tc3589x_gpio);
334out_removeirq:
335 tc3589x_gpio_irq_remove(tc3589x_gpio);
336out_free:
337 kfree(tc3589x_gpio);
338 return ret;
339}
340
341static int __devexit tc3589x_gpio_remove(struct platform_device *pdev)
342{
343 struct tc3589x_gpio *tc3589x_gpio = platform_get_drvdata(pdev);
344 struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
345 struct tc3589x_gpio_platform_data *pdata = tc3589x->pdata->gpio;
346 int irq = platform_get_irq(pdev, 0);
347 int ret;
348
349 if (pdata->remove)
350 pdata->remove(tc3589x, tc3589x_gpio->chip.base);
351
352 ret = gpiochip_remove(&tc3589x_gpio->chip);
353 if (ret < 0) {
354 dev_err(tc3589x_gpio->dev,
355 "unable to remove gpiochip: %d\n", ret);
356 return ret;
357 }
358
359 free_irq(irq, tc3589x_gpio);
360 tc3589x_gpio_irq_remove(tc3589x_gpio);
361
362 platform_set_drvdata(pdev, NULL);
363 kfree(tc3589x_gpio);
364
365 return 0;
366}
367
368static struct platform_driver tc3589x_gpio_driver = {
369 .driver.name = "tc3589x-gpio",
370 .driver.owner = THIS_MODULE,
371 .probe = tc3589x_gpio_probe,
372 .remove = __devexit_p(tc3589x_gpio_remove),
373};
374
375static int __init tc3589x_gpio_init(void)
376{
377 return platform_driver_register(&tc3589x_gpio_driver);
378}
379subsys_initcall(tc3589x_gpio_init);
380
381static void __exit tc3589x_gpio_exit(void)
382{
383 platform_driver_unregister(&tc3589x_gpio_driver);
384}
385module_exit(tc3589x_gpio_exit);
386
387MODULE_LICENSE("GPL v2");
388MODULE_DESCRIPTION("TC3589x GPIO driver");
389MODULE_AUTHOR("Hanumath Prasad, Rabin Vincent");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) ST-Ericsson SA 2010
4 *
5 * Author: Hanumath Prasad <hanumath.prasad@stericsson.com> for ST-Ericsson
6 * Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
7 */
8
9#include <linux/init.h>
10#include <linux/platform_device.h>
11#include <linux/slab.h>
12#include <linux/gpio/driver.h>
13#include <linux/of.h>
14#include <linux/interrupt.h>
15#include <linux/mfd/tc3589x.h>
16#include <linux/bitops.h>
17
18/*
19 * These registers are modified under the irq bus lock and cached to avoid
20 * unnecessary writes in bus_sync_unlock.
21 */
22enum { REG_IBE, REG_IEV, REG_IS, REG_IE };
23
24#define CACHE_NR_REGS 4
25#define CACHE_NR_BANKS 3
26
27struct tc3589x_gpio {
28 struct gpio_chip chip;
29 struct tc3589x *tc3589x;
30 struct device *dev;
31 struct mutex irq_lock;
32 /* Caches of interrupt control registers for bus_lock */
33 u8 regs[CACHE_NR_REGS][CACHE_NR_BANKS];
34 u8 oldregs[CACHE_NR_REGS][CACHE_NR_BANKS];
35};
36
37static int tc3589x_gpio_get(struct gpio_chip *chip, unsigned int offset)
38{
39 struct tc3589x_gpio *tc3589x_gpio = gpiochip_get_data(chip);
40 struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
41 u8 reg = TC3589x_GPIODATA0 + (offset / 8) * 2;
42 u8 mask = BIT(offset % 8);
43 int ret;
44
45 ret = tc3589x_reg_read(tc3589x, reg);
46 if (ret < 0)
47 return ret;
48
49 return !!(ret & mask);
50}
51
52static void tc3589x_gpio_set(struct gpio_chip *chip, unsigned int offset, int val)
53{
54 struct tc3589x_gpio *tc3589x_gpio = gpiochip_get_data(chip);
55 struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
56 u8 reg = TC3589x_GPIODATA0 + (offset / 8) * 2;
57 unsigned int pos = offset % 8;
58 u8 data[] = {val ? BIT(pos) : 0, BIT(pos)};
59
60 tc3589x_block_write(tc3589x, reg, ARRAY_SIZE(data), data);
61}
62
63static int tc3589x_gpio_direction_output(struct gpio_chip *chip,
64 unsigned int offset, int val)
65{
66 struct tc3589x_gpio *tc3589x_gpio = gpiochip_get_data(chip);
67 struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
68 u8 reg = TC3589x_GPIODIR0 + offset / 8;
69 unsigned int pos = offset % 8;
70
71 tc3589x_gpio_set(chip, offset, val);
72
73 return tc3589x_set_bits(tc3589x, reg, BIT(pos), BIT(pos));
74}
75
76static int tc3589x_gpio_direction_input(struct gpio_chip *chip,
77 unsigned int offset)
78{
79 struct tc3589x_gpio *tc3589x_gpio = gpiochip_get_data(chip);
80 struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
81 u8 reg = TC3589x_GPIODIR0 + offset / 8;
82 unsigned int pos = offset % 8;
83
84 return tc3589x_set_bits(tc3589x, reg, BIT(pos), 0);
85}
86
87static int tc3589x_gpio_get_direction(struct gpio_chip *chip,
88 unsigned int offset)
89{
90 struct tc3589x_gpio *tc3589x_gpio = gpiochip_get_data(chip);
91 struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
92 u8 reg = TC3589x_GPIODIR0 + offset / 8;
93 unsigned int pos = offset % 8;
94 int ret;
95
96 ret = tc3589x_reg_read(tc3589x, reg);
97 if (ret < 0)
98 return ret;
99
100 return !(ret & BIT(pos));
101}
102
103static int tc3589x_gpio_set_config(struct gpio_chip *chip, unsigned int offset,
104 unsigned long config)
105{
106 struct tc3589x_gpio *tc3589x_gpio = gpiochip_get_data(chip);
107 struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
108 /*
109 * These registers are alterated at each second address
110 * ODM bit 0 = drive to GND or Hi-Z (open drain)
111 * ODM bit 1 = drive to VDD or Hi-Z (open source)
112 */
113 u8 odmreg = TC3589x_GPIOODM0 + (offset / 8) * 2;
114 u8 odereg = TC3589x_GPIOODE0 + (offset / 8) * 2;
115 unsigned int pos = offset % 8;
116 int ret;
117
118 switch (pinconf_to_config_param(config)) {
119 case PIN_CONFIG_DRIVE_OPEN_DRAIN:
120 /* Set open drain mode */
121 ret = tc3589x_set_bits(tc3589x, odmreg, BIT(pos), 0);
122 if (ret)
123 return ret;
124 /* Enable open drain/source mode */
125 return tc3589x_set_bits(tc3589x, odereg, BIT(pos), BIT(pos));
126 case PIN_CONFIG_DRIVE_OPEN_SOURCE:
127 /* Set open source mode */
128 ret = tc3589x_set_bits(tc3589x, odmreg, BIT(pos), BIT(pos));
129 if (ret)
130 return ret;
131 /* Enable open drain/source mode */
132 return tc3589x_set_bits(tc3589x, odereg, BIT(pos), BIT(pos));
133 case PIN_CONFIG_DRIVE_PUSH_PULL:
134 /* Disable open drain/source mode */
135 return tc3589x_set_bits(tc3589x, odereg, BIT(pos), 0);
136 default:
137 break;
138 }
139 return -ENOTSUPP;
140}
141
142static const struct gpio_chip template_chip = {
143 .label = "tc3589x",
144 .owner = THIS_MODULE,
145 .get = tc3589x_gpio_get,
146 .set = tc3589x_gpio_set,
147 .direction_output = tc3589x_gpio_direction_output,
148 .direction_input = tc3589x_gpio_direction_input,
149 .get_direction = tc3589x_gpio_get_direction,
150 .set_config = tc3589x_gpio_set_config,
151 .can_sleep = true,
152};
153
154static int tc3589x_gpio_irq_set_type(struct irq_data *d, unsigned int type)
155{
156 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
157 struct tc3589x_gpio *tc3589x_gpio = gpiochip_get_data(gc);
158 int offset = d->hwirq;
159 int regoffset = offset / 8;
160 int mask = BIT(offset % 8);
161
162 if (type == IRQ_TYPE_EDGE_BOTH) {
163 tc3589x_gpio->regs[REG_IBE][regoffset] |= mask;
164 return 0;
165 }
166
167 tc3589x_gpio->regs[REG_IBE][regoffset] &= ~mask;
168
169 if (type == IRQ_TYPE_LEVEL_LOW || type == IRQ_TYPE_LEVEL_HIGH)
170 tc3589x_gpio->regs[REG_IS][regoffset] |= mask;
171 else
172 tc3589x_gpio->regs[REG_IS][regoffset] &= ~mask;
173
174 if (type == IRQ_TYPE_EDGE_RISING || type == IRQ_TYPE_LEVEL_HIGH)
175 tc3589x_gpio->regs[REG_IEV][regoffset] |= mask;
176 else
177 tc3589x_gpio->regs[REG_IEV][regoffset] &= ~mask;
178
179 return 0;
180}
181
182static void tc3589x_gpio_irq_lock(struct irq_data *d)
183{
184 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
185 struct tc3589x_gpio *tc3589x_gpio = gpiochip_get_data(gc);
186
187 mutex_lock(&tc3589x_gpio->irq_lock);
188}
189
190static void tc3589x_gpio_irq_sync_unlock(struct irq_data *d)
191{
192 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
193 struct tc3589x_gpio *tc3589x_gpio = gpiochip_get_data(gc);
194 struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
195 static const u8 regmap[] = {
196 [REG_IBE] = TC3589x_GPIOIBE0,
197 [REG_IEV] = TC3589x_GPIOIEV0,
198 [REG_IS] = TC3589x_GPIOIS0,
199 [REG_IE] = TC3589x_GPIOIE0,
200 };
201 int i, j;
202
203 for (i = 0; i < CACHE_NR_REGS; i++) {
204 for (j = 0; j < CACHE_NR_BANKS; j++) {
205 u8 old = tc3589x_gpio->oldregs[i][j];
206 u8 new = tc3589x_gpio->regs[i][j];
207
208 if (new == old)
209 continue;
210
211 tc3589x_gpio->oldregs[i][j] = new;
212 tc3589x_reg_write(tc3589x, regmap[i] + j * 8, new);
213 }
214 }
215
216 mutex_unlock(&tc3589x_gpio->irq_lock);
217}
218
219static void tc3589x_gpio_irq_mask(struct irq_data *d)
220{
221 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
222 struct tc3589x_gpio *tc3589x_gpio = gpiochip_get_data(gc);
223 int offset = d->hwirq;
224 int regoffset = offset / 8;
225 int mask = BIT(offset % 8);
226
227 tc3589x_gpio->regs[REG_IE][regoffset] &= ~mask;
228}
229
230static void tc3589x_gpio_irq_unmask(struct irq_data *d)
231{
232 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
233 struct tc3589x_gpio *tc3589x_gpio = gpiochip_get_data(gc);
234 int offset = d->hwirq;
235 int regoffset = offset / 8;
236 int mask = BIT(offset % 8);
237
238 tc3589x_gpio->regs[REG_IE][regoffset] |= mask;
239}
240
241static struct irq_chip tc3589x_gpio_irq_chip = {
242 .name = "tc3589x-gpio",
243 .irq_bus_lock = tc3589x_gpio_irq_lock,
244 .irq_bus_sync_unlock = tc3589x_gpio_irq_sync_unlock,
245 .irq_mask = tc3589x_gpio_irq_mask,
246 .irq_unmask = tc3589x_gpio_irq_unmask,
247 .irq_set_type = tc3589x_gpio_irq_set_type,
248};
249
250static irqreturn_t tc3589x_gpio_irq(int irq, void *dev)
251{
252 struct tc3589x_gpio *tc3589x_gpio = dev;
253 struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
254 u8 status[CACHE_NR_BANKS];
255 int ret;
256 int i;
257
258 ret = tc3589x_block_read(tc3589x, TC3589x_GPIOMIS0,
259 ARRAY_SIZE(status), status);
260 if (ret < 0)
261 return IRQ_NONE;
262
263 for (i = 0; i < ARRAY_SIZE(status); i++) {
264 unsigned int stat = status[i];
265 if (!stat)
266 continue;
267
268 while (stat) {
269 int bit = __ffs(stat);
270 int line = i * 8 + bit;
271 int irq = irq_find_mapping(tc3589x_gpio->chip.irq.domain,
272 line);
273
274 handle_nested_irq(irq);
275 stat &= ~(1 << bit);
276 }
277
278 tc3589x_reg_write(tc3589x, TC3589x_GPIOIC0 + i, status[i]);
279 }
280
281 return IRQ_HANDLED;
282}
283
284static int tc3589x_gpio_probe(struct platform_device *pdev)
285{
286 struct tc3589x *tc3589x = dev_get_drvdata(pdev->dev.parent);
287 struct device_node *np = pdev->dev.of_node;
288 struct tc3589x_gpio *tc3589x_gpio;
289 int ret;
290 int irq;
291
292 if (!np) {
293 dev_err(&pdev->dev, "No Device Tree node found\n");
294 return -EINVAL;
295 }
296
297 irq = platform_get_irq(pdev, 0);
298 if (irq < 0)
299 return irq;
300
301 tc3589x_gpio = devm_kzalloc(&pdev->dev, sizeof(struct tc3589x_gpio),
302 GFP_KERNEL);
303 if (!tc3589x_gpio)
304 return -ENOMEM;
305
306 mutex_init(&tc3589x_gpio->irq_lock);
307
308 tc3589x_gpio->dev = &pdev->dev;
309 tc3589x_gpio->tc3589x = tc3589x;
310
311 tc3589x_gpio->chip = template_chip;
312 tc3589x_gpio->chip.ngpio = tc3589x->num_gpio;
313 tc3589x_gpio->chip.parent = &pdev->dev;
314 tc3589x_gpio->chip.base = -1;
315 tc3589x_gpio->chip.of_node = np;
316
317 /* Bring the GPIO module out of reset */
318 ret = tc3589x_set_bits(tc3589x, TC3589x_RSTCTRL,
319 TC3589x_RSTCTRL_GPIRST, 0);
320 if (ret < 0)
321 return ret;
322
323 ret = devm_request_threaded_irq(&pdev->dev,
324 irq, NULL, tc3589x_gpio_irq,
325 IRQF_ONESHOT, "tc3589x-gpio",
326 tc3589x_gpio);
327 if (ret) {
328 dev_err(&pdev->dev, "unable to get irq: %d\n", ret);
329 return ret;
330 }
331
332 ret = devm_gpiochip_add_data(&pdev->dev, &tc3589x_gpio->chip,
333 tc3589x_gpio);
334 if (ret) {
335 dev_err(&pdev->dev, "unable to add gpiochip: %d\n", ret);
336 return ret;
337 }
338
339 ret = gpiochip_irqchip_add_nested(&tc3589x_gpio->chip,
340 &tc3589x_gpio_irq_chip,
341 0,
342 handle_simple_irq,
343 IRQ_TYPE_NONE);
344 if (ret) {
345 dev_err(&pdev->dev,
346 "could not connect irqchip to gpiochip\n");
347 return ret;
348 }
349
350 gpiochip_set_nested_irqchip(&tc3589x_gpio->chip,
351 &tc3589x_gpio_irq_chip,
352 irq);
353
354 platform_set_drvdata(pdev, tc3589x_gpio);
355
356 return 0;
357}
358
359static struct platform_driver tc3589x_gpio_driver = {
360 .driver.name = "tc3589x-gpio",
361 .probe = tc3589x_gpio_probe,
362};
363
364static int __init tc3589x_gpio_init(void)
365{
366 return platform_driver_register(&tc3589x_gpio_driver);
367}
368subsys_initcall(tc3589x_gpio_init);