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
|
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2015-2018 Pengutronix, Uwe Kleine-König <kernel@pengutronix.de>
*/
#include <linux/module.h>
#include <linux/siox.h>
#include <linux/gpio/driver.h>
#include <linux/of.h>
struct gpio_siox_ddata {
struct gpio_chip gchip;
struct irq_chip ichip;
struct mutex lock;
u8 setdata[1];
u8 getdata[3];
spinlock_t irqlock;
u32 irq_enable;
u32 irq_status;
u32 irq_type[20];
};
/*
* Note that this callback only sets the value that is clocked out in the next
* cycle.
*/
static int gpio_siox_set_data(struct siox_device *sdevice, u8 status, u8 buf[])
{
struct gpio_siox_ddata *ddata = dev_get_drvdata(&sdevice->dev);
mutex_lock(&ddata->lock);
buf[0] = ddata->setdata[0];
mutex_unlock(&ddata->lock);
return 0;
}
static int gpio_siox_get_data(struct siox_device *sdevice, const u8 buf[])
{
struct gpio_siox_ddata *ddata = dev_get_drvdata(&sdevice->dev);
size_t offset;
u32 trigger;
mutex_lock(&ddata->lock);
spin_lock_irq(&ddata->irqlock);
for (offset = 0; offset < 12; ++offset) {
unsigned int bitpos = 11 - offset;
unsigned int gpiolevel = buf[bitpos / 8] & (1 << bitpos % 8);
unsigned int prev_level =
ddata->getdata[bitpos / 8] & (1 << (bitpos % 8));
u32 irq_type = ddata->irq_type[offset];
if (gpiolevel) {
if ((irq_type & IRQ_TYPE_LEVEL_HIGH) ||
((irq_type & IRQ_TYPE_EDGE_RISING) && !prev_level))
ddata->irq_status |= 1 << offset;
} else {
if ((irq_type & IRQ_TYPE_LEVEL_LOW) ||
((irq_type & IRQ_TYPE_EDGE_FALLING) && prev_level))
ddata->irq_status |= 1 << offset;
}
}
trigger = ddata->irq_status & ddata->irq_enable;
spin_unlock_irq(&ddata->irqlock);
ddata->getdata[0] = buf[0];
ddata->getdata[1] = buf[1];
ddata->getdata[2] = buf[2];
mutex_unlock(&ddata->lock);
for (offset = 0; offset < 12; ++offset) {
if (trigger & (1 << offset)) {
struct irq_domain *irqdomain = ddata->gchip.irq.domain;
unsigned int irq = irq_find_mapping(irqdomain, offset);
/*
* Conceptually handle_nested_irq should call the flow
* handler of the irq chip. But it doesn't, so we have
* to clean the irq_status here.
*/
spin_lock_irq(&ddata->irqlock);
ddata->irq_status &= ~(1 << offset);
spin_unlock_irq(&ddata->irqlock);
handle_nested_irq(irq);
}
}
return 0;
}
static void gpio_siox_irq_ack(struct irq_data *d)
{
struct irq_chip *ic = irq_data_get_irq_chip(d);
struct gpio_siox_ddata *ddata =
container_of(ic, struct gpio_siox_ddata, ichip);
spin_lock_irq(&ddata->irqlock);
ddata->irq_status &= ~(1 << d->hwirq);
spin_unlock_irq(&ddata->irqlock);
}
static void gpio_siox_irq_mask(struct irq_data *d)
{
struct irq_chip *ic = irq_data_get_irq_chip(d);
struct gpio_siox_ddata *ddata =
container_of(ic, struct gpio_siox_ddata, ichip);
spin_lock_irq(&ddata->irqlock);
ddata->irq_enable &= ~(1 << d->hwirq);
spin_unlock_irq(&ddata->irqlock);
}
static void gpio_siox_irq_unmask(struct irq_data *d)
{
struct irq_chip *ic = irq_data_get_irq_chip(d);
struct gpio_siox_ddata *ddata =
container_of(ic, struct gpio_siox_ddata, ichip);
spin_lock_irq(&ddata->irqlock);
ddata->irq_enable |= 1 << d->hwirq;
spin_unlock_irq(&ddata->irqlock);
}
static int gpio_siox_irq_set_type(struct irq_data *d, u32 type)
{
struct irq_chip *ic = irq_data_get_irq_chip(d);
struct gpio_siox_ddata *ddata =
container_of(ic, struct gpio_siox_ddata, ichip);
spin_lock_irq(&ddata->irqlock);
ddata->irq_type[d->hwirq] = type;
spin_unlock_irq(&ddata->irqlock);
return 0;
}
static int gpio_siox_get(struct gpio_chip *chip, unsigned int offset)
{
struct gpio_siox_ddata *ddata =
container_of(chip, struct gpio_siox_ddata, gchip);
int ret;
mutex_lock(&ddata->lock);
if (offset >= 12) {
unsigned int bitpos = 19 - offset;
ret = ddata->setdata[0] & (1 << bitpos);
} else {
unsigned int bitpos = 11 - offset;
ret = ddata->getdata[bitpos / 8] & (1 << (bitpos % 8));
}
mutex_unlock(&ddata->lock);
return ret;
}
static void gpio_siox_set(struct gpio_chip *chip,
unsigned int offset, int value)
{
struct gpio_siox_ddata *ddata =
container_of(chip, struct gpio_siox_ddata, gchip);
u8 mask = 1 << (19 - offset);
mutex_lock(&ddata->lock);
if (value)
ddata->setdata[0] |= mask;
else
ddata->setdata[0] &= ~mask;
mutex_unlock(&ddata->lock);
}
static int gpio_siox_direction_input(struct gpio_chip *chip,
unsigned int offset)
{
if (offset >= 12)
return -EINVAL;
return 0;
}
static int gpio_siox_direction_output(struct gpio_chip *chip,
unsigned int offset, int value)
{
if (offset < 12)
return -EINVAL;
gpio_siox_set(chip, offset, value);
return 0;
}
static int gpio_siox_get_direction(struct gpio_chip *chip, unsigned int offset)
{
if (offset < 12)
return 1; /* input */
else
return 0; /* output */
}
static int gpio_siox_probe(struct siox_device *sdevice)
{
struct gpio_siox_ddata *ddata;
struct gpio_irq_chip *girq;
struct device *dev = &sdevice->dev;
int ret;
ddata = devm_kzalloc(dev, sizeof(*ddata), GFP_KERNEL);
if (!ddata)
return -ENOMEM;
dev_set_drvdata(dev, ddata);
mutex_init(&ddata->lock);
spin_lock_init(&ddata->irqlock);
ddata->gchip.base = -1;
ddata->gchip.can_sleep = 1;
ddata->gchip.parent = dev;
ddata->gchip.owner = THIS_MODULE;
ddata->gchip.get = gpio_siox_get;
ddata->gchip.set = gpio_siox_set;
ddata->gchip.direction_input = gpio_siox_direction_input;
ddata->gchip.direction_output = gpio_siox_direction_output;
ddata->gchip.get_direction = gpio_siox_get_direction;
ddata->gchip.ngpio = 20;
ddata->ichip.name = "siox-gpio";
ddata->ichip.irq_ack = gpio_siox_irq_ack;
ddata->ichip.irq_mask = gpio_siox_irq_mask;
ddata->ichip.irq_unmask = gpio_siox_irq_unmask;
ddata->ichip.irq_set_type = gpio_siox_irq_set_type;
girq = &ddata->gchip.irq;
girq->chip = &ddata->ichip;
girq->default_type = IRQ_TYPE_NONE;
girq->handler = handle_level_irq;
ret = devm_gpiochip_add_data(dev, &ddata->gchip, NULL);
if (ret)
dev_err(dev, "Failed to register gpio chip (%d)\n", ret);
return ret;
}
static struct siox_driver gpio_siox_driver = {
.probe = gpio_siox_probe,
.set_data = gpio_siox_set_data,
.get_data = gpio_siox_get_data,
.driver = {
.name = "gpio-siox",
},
};
module_siox_driver(gpio_siox_driver);
MODULE_AUTHOR("Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>");
MODULE_DESCRIPTION("SIOX gpio driver");
MODULE_LICENSE("GPL v2");
|
