forked from torvalds/linux
-
Notifications
You must be signed in to change notification settings - Fork 17
/
gpio-mpc5200.c
366 lines (283 loc) · 8.95 KB
/
gpio-mpc5200.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
// SPDX-License-Identifier: GPL-2.0-only
/*
* MPC52xx gpio driver
*
* Copyright (c) 2008 Sascha Hauer <[email protected]>, Pengutronix
*/
#include <linux/of.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/gpio/legacy-of-mm-gpiochip.h>
#include <linux/io.h>
#include <linux/of_platform.h>
#include <linux/module.h>
#include <asm/mpc52xx.h>
#include <sysdev/fsl_soc.h>
static DEFINE_SPINLOCK(gpio_lock);
struct mpc52xx_gpiochip {
struct of_mm_gpio_chip mmchip;
unsigned int shadow_dvo;
unsigned int shadow_gpioe;
unsigned int shadow_ddr;
};
/*
* GPIO LIB API implementation for wakeup GPIOs.
*
* There's a maximum of 8 wakeup GPIOs. Which of these are available
* for use depends on your board setup.
*
* 0 -> GPIO_WKUP_7
* 1 -> GPIO_WKUP_6
* 2 -> PSC6_1
* 3 -> PSC6_0
* 4 -> ETH_17
* 5 -> PSC3_9
* 6 -> PSC2_4
* 7 -> PSC1_4
*
*/
static int mpc52xx_wkup_gpio_get(struct gpio_chip *gc, unsigned int gpio)
{
struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
unsigned int ret;
ret = (in_8(®s->wkup_ival) >> (7 - gpio)) & 1;
pr_debug("%s: gpio: %d ret: %d\n", __func__, gpio, ret);
return ret;
}
static inline void
__mpc52xx_wkup_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
{
struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc);
struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
if (val)
chip->shadow_dvo |= 1 << (7 - gpio);
else
chip->shadow_dvo &= ~(1 << (7 - gpio));
out_8(®s->wkup_dvo, chip->shadow_dvo);
}
static void
mpc52xx_wkup_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
{
unsigned long flags;
spin_lock_irqsave(&gpio_lock, flags);
__mpc52xx_wkup_gpio_set(gc, gpio, val);
spin_unlock_irqrestore(&gpio_lock, flags);
pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
}
static int mpc52xx_wkup_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
{
struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc);
struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
unsigned long flags;
spin_lock_irqsave(&gpio_lock, flags);
/* set the direction */
chip->shadow_ddr &= ~(1 << (7 - gpio));
out_8(®s->wkup_ddr, chip->shadow_ddr);
/* and enable the pin */
chip->shadow_gpioe |= 1 << (7 - gpio);
out_8(®s->wkup_gpioe, chip->shadow_gpioe);
spin_unlock_irqrestore(&gpio_lock, flags);
return 0;
}
static int
mpc52xx_wkup_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
{
struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc);
unsigned long flags;
spin_lock_irqsave(&gpio_lock, flags);
__mpc52xx_wkup_gpio_set(gc, gpio, val);
/* Then set direction */
chip->shadow_ddr |= 1 << (7 - gpio);
out_8(®s->wkup_ddr, chip->shadow_ddr);
/* Finally enable the pin */
chip->shadow_gpioe |= 1 << (7 - gpio);
out_8(®s->wkup_gpioe, chip->shadow_gpioe);
spin_unlock_irqrestore(&gpio_lock, flags);
pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
return 0;
}
static int mpc52xx_wkup_gpiochip_probe(struct platform_device *ofdev)
{
struct mpc52xx_gpiochip *chip;
struct mpc52xx_gpio_wkup __iomem *regs;
struct gpio_chip *gc;
int ret;
chip = devm_kzalloc(&ofdev->dev, sizeof(*chip), GFP_KERNEL);
if (!chip)
return -ENOMEM;
platform_set_drvdata(ofdev, chip);
gc = &chip->mmchip.gc;
gc->ngpio = 8;
gc->direction_input = mpc52xx_wkup_gpio_dir_in;
gc->direction_output = mpc52xx_wkup_gpio_dir_out;
gc->get = mpc52xx_wkup_gpio_get;
gc->set = mpc52xx_wkup_gpio_set;
ret = of_mm_gpiochip_add_data(ofdev->dev.of_node, &chip->mmchip, chip);
if (ret)
return ret;
regs = chip->mmchip.regs;
chip->shadow_gpioe = in_8(®s->wkup_gpioe);
chip->shadow_ddr = in_8(®s->wkup_ddr);
chip->shadow_dvo = in_8(®s->wkup_dvo);
return 0;
}
static int mpc52xx_gpiochip_remove(struct platform_device *ofdev)
{
struct mpc52xx_gpiochip *chip = platform_get_drvdata(ofdev);
of_mm_gpiochip_remove(&chip->mmchip);
return 0;
}
static const struct of_device_id mpc52xx_wkup_gpiochip_match[] = {
{ .compatible = "fsl,mpc5200-gpio-wkup", },
{}
};
static struct platform_driver mpc52xx_wkup_gpiochip_driver = {
.driver = {
.name = "mpc5200-gpio-wkup",
.of_match_table = mpc52xx_wkup_gpiochip_match,
},
.probe = mpc52xx_wkup_gpiochip_probe,
.remove = mpc52xx_gpiochip_remove,
};
/*
* GPIO LIB API implementation for simple GPIOs
*
* There's a maximum of 32 simple GPIOs. Which of these are available
* for use depends on your board setup.
* The numbering reflects the bit numbering in the port registers:
*
* 0..1 > reserved
* 2..3 > IRDA
* 4..7 > ETHR
* 8..11 > reserved
* 12..15 > USB
* 16..17 > reserved
* 18..23 > PSC3
* 24..27 > PSC2
* 28..31 > PSC1
*/
static int mpc52xx_simple_gpio_get(struct gpio_chip *gc, unsigned int gpio)
{
struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
unsigned int ret;
ret = (in_be32(®s->simple_ival) >> (31 - gpio)) & 1;
return ret;
}
static inline void
__mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
{
struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc);
struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
if (val)
chip->shadow_dvo |= 1 << (31 - gpio);
else
chip->shadow_dvo &= ~(1 << (31 - gpio));
out_be32(®s->simple_dvo, chip->shadow_dvo);
}
static void
mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
{
unsigned long flags;
spin_lock_irqsave(&gpio_lock, flags);
__mpc52xx_simple_gpio_set(gc, gpio, val);
spin_unlock_irqrestore(&gpio_lock, flags);
pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
}
static int mpc52xx_simple_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
{
struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc);
struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
unsigned long flags;
spin_lock_irqsave(&gpio_lock, flags);
/* set the direction */
chip->shadow_ddr &= ~(1 << (31 - gpio));
out_be32(®s->simple_ddr, chip->shadow_ddr);
/* and enable the pin */
chip->shadow_gpioe |= 1 << (31 - gpio);
out_be32(®s->simple_gpioe, chip->shadow_gpioe);
spin_unlock_irqrestore(&gpio_lock, flags);
return 0;
}
static int
mpc52xx_simple_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
{
struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc);
struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
unsigned long flags;
spin_lock_irqsave(&gpio_lock, flags);
/* First set initial value */
__mpc52xx_simple_gpio_set(gc, gpio, val);
/* Then set direction */
chip->shadow_ddr |= 1 << (31 - gpio);
out_be32(®s->simple_ddr, chip->shadow_ddr);
/* Finally enable the pin */
chip->shadow_gpioe |= 1 << (31 - gpio);
out_be32(®s->simple_gpioe, chip->shadow_gpioe);
spin_unlock_irqrestore(&gpio_lock, flags);
pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
return 0;
}
static int mpc52xx_simple_gpiochip_probe(struct platform_device *ofdev)
{
struct mpc52xx_gpiochip *chip;
struct gpio_chip *gc;
struct mpc52xx_gpio __iomem *regs;
int ret;
chip = devm_kzalloc(&ofdev->dev, sizeof(*chip), GFP_KERNEL);
if (!chip)
return -ENOMEM;
platform_set_drvdata(ofdev, chip);
gc = &chip->mmchip.gc;
gc->ngpio = 32;
gc->direction_input = mpc52xx_simple_gpio_dir_in;
gc->direction_output = mpc52xx_simple_gpio_dir_out;
gc->get = mpc52xx_simple_gpio_get;
gc->set = mpc52xx_simple_gpio_set;
ret = of_mm_gpiochip_add_data(ofdev->dev.of_node, &chip->mmchip, chip);
if (ret)
return ret;
regs = chip->mmchip.regs;
chip->shadow_gpioe = in_be32(®s->simple_gpioe);
chip->shadow_ddr = in_be32(®s->simple_ddr);
chip->shadow_dvo = in_be32(®s->simple_dvo);
return 0;
}
static const struct of_device_id mpc52xx_simple_gpiochip_match[] = {
{ .compatible = "fsl,mpc5200-gpio", },
{}
};
static struct platform_driver mpc52xx_simple_gpiochip_driver = {
.driver = {
.name = "mpc5200-gpio",
.of_match_table = mpc52xx_simple_gpiochip_match,
},
.probe = mpc52xx_simple_gpiochip_probe,
.remove = mpc52xx_gpiochip_remove,
};
static struct platform_driver * const drivers[] = {
&mpc52xx_wkup_gpiochip_driver,
&mpc52xx_simple_gpiochip_driver,
};
static int __init mpc52xx_gpio_init(void)
{
return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
}
/* Make sure we get initialised before anyone else tries to use us */
subsys_initcall(mpc52xx_gpio_init);
static void __exit mpc52xx_gpio_exit(void)
{
platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
}
module_exit(mpc52xx_gpio_exit);
MODULE_DESCRIPTION("Freescale MPC52xx gpio driver");
MODULE_AUTHOR("Sascha Hauer <[email protected]");
MODULE_LICENSE("GPL v2");