-
Notifications
You must be signed in to change notification settings - Fork 87
/
gpio-tc3589x.c
389 lines (313 loc) · 9.62 KB
/
gpio-tc3589x.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
/*
* Copyright (C) ST-Ericsson SA 2010
*
* License Terms: GNU General Public License, version 2
* Author: Hanumath Prasad <[email protected]> for ST-Ericsson
* Author: Rabin Vincent <[email protected]> for ST-Ericsson
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/gpio.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/mfd/tc3589x.h>
/*
* These registers are modified under the irq bus lock and cached to avoid
* unnecessary writes in bus_sync_unlock.
*/
enum { REG_IBE, REG_IEV, REG_IS, REG_IE };
#define CACHE_NR_REGS 4
#define CACHE_NR_BANKS 3
struct tc3589x_gpio {
struct gpio_chip chip;
struct tc3589x *tc3589x;
struct device *dev;
struct mutex irq_lock;
int irq_base;
/* Caches of interrupt control registers for bus_lock */
u8 regs[CACHE_NR_REGS][CACHE_NR_BANKS];
u8 oldregs[CACHE_NR_REGS][CACHE_NR_BANKS];
};
static inline struct tc3589x_gpio *to_tc3589x_gpio(struct gpio_chip *chip)
{
return container_of(chip, struct tc3589x_gpio, chip);
}
static int tc3589x_gpio_get(struct gpio_chip *chip, unsigned offset)
{
struct tc3589x_gpio *tc3589x_gpio = to_tc3589x_gpio(chip);
struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
u8 reg = TC3589x_GPIODATA0 + (offset / 8) * 2;
u8 mask = 1 << (offset % 8);
int ret;
ret = tc3589x_reg_read(tc3589x, reg);
if (ret < 0)
return ret;
return ret & mask;
}
static void tc3589x_gpio_set(struct gpio_chip *chip, unsigned offset, int val)
{
struct tc3589x_gpio *tc3589x_gpio = to_tc3589x_gpio(chip);
struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
u8 reg = TC3589x_GPIODATA0 + (offset / 8) * 2;
unsigned pos = offset % 8;
u8 data[] = {!!val << pos, 1 << pos};
tc3589x_block_write(tc3589x, reg, ARRAY_SIZE(data), data);
}
static int tc3589x_gpio_direction_output(struct gpio_chip *chip,
unsigned offset, int val)
{
struct tc3589x_gpio *tc3589x_gpio = to_tc3589x_gpio(chip);
struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
u8 reg = TC3589x_GPIODIR0 + offset / 8;
unsigned pos = offset % 8;
tc3589x_gpio_set(chip, offset, val);
return tc3589x_set_bits(tc3589x, reg, 1 << pos, 1 << pos);
}
static int tc3589x_gpio_direction_input(struct gpio_chip *chip,
unsigned offset)
{
struct tc3589x_gpio *tc3589x_gpio = to_tc3589x_gpio(chip);
struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
u8 reg = TC3589x_GPIODIR0 + offset / 8;
unsigned pos = offset % 8;
return tc3589x_set_bits(tc3589x, reg, 1 << pos, 0);
}
static int tc3589x_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
{
struct tc3589x_gpio *tc3589x_gpio = to_tc3589x_gpio(chip);
return tc3589x_gpio->irq_base + offset;
}
static struct gpio_chip template_chip = {
.label = "tc3589x",
.owner = THIS_MODULE,
.direction_input = tc3589x_gpio_direction_input,
.get = tc3589x_gpio_get,
.direction_output = tc3589x_gpio_direction_output,
.set = tc3589x_gpio_set,
.to_irq = tc3589x_gpio_to_irq,
.can_sleep = 1,
};
static int tc3589x_gpio_irq_set_type(struct irq_data *d, unsigned int type)
{
struct tc3589x_gpio *tc3589x_gpio = irq_data_get_irq_chip_data(d);
int offset = d->irq - tc3589x_gpio->irq_base;
int regoffset = offset / 8;
int mask = 1 << (offset % 8);
if (type == IRQ_TYPE_EDGE_BOTH) {
tc3589x_gpio->regs[REG_IBE][regoffset] |= mask;
return 0;
}
tc3589x_gpio->regs[REG_IBE][regoffset] &= ~mask;
if (type == IRQ_TYPE_LEVEL_LOW || type == IRQ_TYPE_LEVEL_HIGH)
tc3589x_gpio->regs[REG_IS][regoffset] |= mask;
else
tc3589x_gpio->regs[REG_IS][regoffset] &= ~mask;
if (type == IRQ_TYPE_EDGE_RISING || type == IRQ_TYPE_LEVEL_HIGH)
tc3589x_gpio->regs[REG_IEV][regoffset] |= mask;
else
tc3589x_gpio->regs[REG_IEV][regoffset] &= ~mask;
return 0;
}
static void tc3589x_gpio_irq_lock(struct irq_data *d)
{
struct tc3589x_gpio *tc3589x_gpio = irq_data_get_irq_chip_data(d);
mutex_lock(&tc3589x_gpio->irq_lock);
}
static void tc3589x_gpio_irq_sync_unlock(struct irq_data *d)
{
struct tc3589x_gpio *tc3589x_gpio = irq_data_get_irq_chip_data(d);
struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
static const u8 regmap[] = {
[REG_IBE] = TC3589x_GPIOIBE0,
[REG_IEV] = TC3589x_GPIOIEV0,
[REG_IS] = TC3589x_GPIOIS0,
[REG_IE] = TC3589x_GPIOIE0,
};
int i, j;
for (i = 0; i < CACHE_NR_REGS; i++) {
for (j = 0; j < CACHE_NR_BANKS; j++) {
u8 old = tc3589x_gpio->oldregs[i][j];
u8 new = tc3589x_gpio->regs[i][j];
if (new == old)
continue;
tc3589x_gpio->oldregs[i][j] = new;
tc3589x_reg_write(tc3589x, regmap[i] + j * 8, new);
}
}
mutex_unlock(&tc3589x_gpio->irq_lock);
}
static void tc3589x_gpio_irq_mask(struct irq_data *d)
{
struct tc3589x_gpio *tc3589x_gpio = irq_data_get_irq_chip_data(d);
int offset = d->irq - tc3589x_gpio->irq_base;
int regoffset = offset / 8;
int mask = 1 << (offset % 8);
tc3589x_gpio->regs[REG_IE][regoffset] &= ~mask;
}
static void tc3589x_gpio_irq_unmask(struct irq_data *d)
{
struct tc3589x_gpio *tc3589x_gpio = irq_data_get_irq_chip_data(d);
int offset = d->irq - tc3589x_gpio->irq_base;
int regoffset = offset / 8;
int mask = 1 << (offset % 8);
tc3589x_gpio->regs[REG_IE][regoffset] |= mask;
}
static struct irq_chip tc3589x_gpio_irq_chip = {
.name = "tc3589x-gpio",
.irq_bus_lock = tc3589x_gpio_irq_lock,
.irq_bus_sync_unlock = tc3589x_gpio_irq_sync_unlock,
.irq_mask = tc3589x_gpio_irq_mask,
.irq_unmask = tc3589x_gpio_irq_unmask,
.irq_set_type = tc3589x_gpio_irq_set_type,
};
static irqreturn_t tc3589x_gpio_irq(int irq, void *dev)
{
struct tc3589x_gpio *tc3589x_gpio = dev;
struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
u8 status[CACHE_NR_BANKS];
int ret;
int i;
ret = tc3589x_block_read(tc3589x, TC3589x_GPIOMIS0,
ARRAY_SIZE(status), status);
if (ret < 0)
return IRQ_NONE;
for (i = 0; i < ARRAY_SIZE(status); i++) {
unsigned int stat = status[i];
if (!stat)
continue;
while (stat) {
int bit = __ffs(stat);
int line = i * 8 + bit;
handle_nested_irq(tc3589x_gpio->irq_base + line);
stat &= ~(1 << bit);
}
tc3589x_reg_write(tc3589x, TC3589x_GPIOIC0 + i, status[i]);
}
return IRQ_HANDLED;
}
static int tc3589x_gpio_irq_init(struct tc3589x_gpio *tc3589x_gpio)
{
int base = tc3589x_gpio->irq_base;
int irq;
for (irq = base; irq < base + tc3589x_gpio->chip.ngpio; irq++) {
irq_set_chip_data(irq, tc3589x_gpio);
irq_set_chip_and_handler(irq, &tc3589x_gpio_irq_chip,
handle_simple_irq);
irq_set_nested_thread(irq, 1);
#ifdef CONFIG_ARM
set_irq_flags(irq, IRQF_VALID);
#else
irq_set_noprobe(irq);
#endif
}
return 0;
}
static void tc3589x_gpio_irq_remove(struct tc3589x_gpio *tc3589x_gpio)
{
int base = tc3589x_gpio->irq_base;
int irq;
for (irq = base; irq < base + tc3589x_gpio->chip.ngpio; irq++) {
#ifdef CONFIG_ARM
set_irq_flags(irq, 0);
#endif
irq_set_chip_and_handler(irq, NULL, NULL);
irq_set_chip_data(irq, NULL);
}
}
static int __devinit tc3589x_gpio_probe(struct platform_device *pdev)
{
struct tc3589x *tc3589x = dev_get_drvdata(pdev->dev.parent);
struct tc3589x_gpio_platform_data *pdata;
struct tc3589x_gpio *tc3589x_gpio;
int ret;
int irq;
pdata = tc3589x->pdata->gpio;
if (!pdata)
return -ENODEV;
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return irq;
tc3589x_gpio = kzalloc(sizeof(struct tc3589x_gpio), GFP_KERNEL);
if (!tc3589x_gpio)
return -ENOMEM;
mutex_init(&tc3589x_gpio->irq_lock);
tc3589x_gpio->dev = &pdev->dev;
tc3589x_gpio->tc3589x = tc3589x;
tc3589x_gpio->chip = template_chip;
tc3589x_gpio->chip.ngpio = tc3589x->num_gpio;
tc3589x_gpio->chip.dev = &pdev->dev;
tc3589x_gpio->chip.base = pdata->gpio_base;
tc3589x_gpio->irq_base = tc3589x->irq_base + TC3589x_INT_GPIO(0);
/* Bring the GPIO module out of reset */
ret = tc3589x_set_bits(tc3589x, TC3589x_RSTCTRL,
TC3589x_RSTCTRL_GPIRST, 0);
if (ret < 0)
goto out_free;
ret = tc3589x_gpio_irq_init(tc3589x_gpio);
if (ret)
goto out_free;
ret = request_threaded_irq(irq, NULL, tc3589x_gpio_irq, IRQF_ONESHOT,
"tc3589x-gpio", tc3589x_gpio);
if (ret) {
dev_err(&pdev->dev, "unable to get irq: %d\n", ret);
goto out_removeirq;
}
ret = gpiochip_add(&tc3589x_gpio->chip);
if (ret) {
dev_err(&pdev->dev, "unable to add gpiochip: %d\n", ret);
goto out_freeirq;
}
if (pdata->setup)
pdata->setup(tc3589x, tc3589x_gpio->chip.base);
platform_set_drvdata(pdev, tc3589x_gpio);
return 0;
out_freeirq:
free_irq(irq, tc3589x_gpio);
out_removeirq:
tc3589x_gpio_irq_remove(tc3589x_gpio);
out_free:
kfree(tc3589x_gpio);
return ret;
}
static int __devexit tc3589x_gpio_remove(struct platform_device *pdev)
{
struct tc3589x_gpio *tc3589x_gpio = platform_get_drvdata(pdev);
struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
struct tc3589x_gpio_platform_data *pdata = tc3589x->pdata->gpio;
int irq = platform_get_irq(pdev, 0);
int ret;
if (pdata->remove)
pdata->remove(tc3589x, tc3589x_gpio->chip.base);
ret = gpiochip_remove(&tc3589x_gpio->chip);
if (ret < 0) {
dev_err(tc3589x_gpio->dev,
"unable to remove gpiochip: %d\n", ret);
return ret;
}
free_irq(irq, tc3589x_gpio);
tc3589x_gpio_irq_remove(tc3589x_gpio);
platform_set_drvdata(pdev, NULL);
kfree(tc3589x_gpio);
return 0;
}
static struct platform_driver tc3589x_gpio_driver = {
.driver.name = "tc3589x-gpio",
.driver.owner = THIS_MODULE,
.probe = tc3589x_gpio_probe,
.remove = __devexit_p(tc3589x_gpio_remove),
};
static int __init tc3589x_gpio_init(void)
{
return platform_driver_register(&tc3589x_gpio_driver);
}
subsys_initcall(tc3589x_gpio_init);
static void __exit tc3589x_gpio_exit(void)
{
platform_driver_unregister(&tc3589x_gpio_driver);
}
module_exit(tc3589x_gpio_exit);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("TC3589x GPIO driver");
MODULE_AUTHOR("Hanumath Prasad, Rabin Vincent");