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
|
/*
* Copyright (c) 2011 The Chromium OS Authors.
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <dm.h>
#include <fdtdec.h>
#include <malloc.h>
#include <asm/gpio.h>
#include <dt-bindings/gpio/gpio.h>
DECLARE_GLOBAL_DATA_PTR;
/* Flags for each GPIO */
#define GPIOF_OUTPUT (1 << 0) /* Currently set as an output */
#define GPIOF_HIGH (1 << 1) /* Currently set high */
struct gpio_state {
const char *label; /* label given by requester */
u8 flags; /* flags (GPIOF_...) */
};
/* Access routines for GPIO state */
static u8 *get_gpio_flags(struct udevice *dev, unsigned offset)
{
struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
struct gpio_state *state = dev_get_priv(dev);
if (offset >= uc_priv->gpio_count) {
static u8 invalid_flags;
printf("sandbox_gpio: error: invalid gpio %u\n", offset);
return &invalid_flags;
}
return &state[offset].flags;
}
static int get_gpio_flag(struct udevice *dev, unsigned offset, int flag)
{
return (*get_gpio_flags(dev, offset) & flag) != 0;
}
static int set_gpio_flag(struct udevice *dev, unsigned offset, int flag,
int value)
{
u8 *gpio = get_gpio_flags(dev, offset);
if (value)
*gpio |= flag;
else
*gpio &= ~flag;
return 0;
}
/*
* Back-channel sandbox-internal-only access to GPIO state
*/
int sandbox_gpio_get_value(struct udevice *dev, unsigned offset)
{
if (get_gpio_flag(dev, offset, GPIOF_OUTPUT))
debug("sandbox_gpio: get_value on output gpio %u\n", offset);
return get_gpio_flag(dev, offset, GPIOF_HIGH);
}
int sandbox_gpio_set_value(struct udevice *dev, unsigned offset, int value)
{
return set_gpio_flag(dev, offset, GPIOF_HIGH, value);
}
int sandbox_gpio_get_direction(struct udevice *dev, unsigned offset)
{
return get_gpio_flag(dev, offset, GPIOF_OUTPUT);
}
int sandbox_gpio_set_direction(struct udevice *dev, unsigned offset, int output)
{
return set_gpio_flag(dev, offset, GPIOF_OUTPUT, output);
}
/*
* These functions implement the public interface within U-Boot
*/
/* set GPIO port 'offset' as an input */
static int sb_gpio_direction_input(struct udevice *dev, unsigned offset)
{
debug("%s: offset:%u\n", __func__, offset);
return sandbox_gpio_set_direction(dev, offset, 0);
}
/* set GPIO port 'offset' as an output, with polarity 'value' */
static int sb_gpio_direction_output(struct udevice *dev, unsigned offset,
int value)
{
debug("%s: offset:%u, value = %d\n", __func__, offset, value);
return sandbox_gpio_set_direction(dev, offset, 1) |
sandbox_gpio_set_value(dev, offset, value);
}
/* read GPIO IN value of port 'offset' */
static int sb_gpio_get_value(struct udevice *dev, unsigned offset)
{
debug("%s: offset:%u\n", __func__, offset);
return sandbox_gpio_get_value(dev, offset);
}
/* write GPIO OUT value to port 'offset' */
static int sb_gpio_set_value(struct udevice *dev, unsigned offset, int value)
{
debug("%s: offset:%u, value = %d\n", __func__, offset, value);
if (!sandbox_gpio_get_direction(dev, offset)) {
printf("sandbox_gpio: error: set_value on input gpio %u\n",
offset);
return -1;
}
return sandbox_gpio_set_value(dev, offset, value);
}
static int sb_gpio_get_function(struct udevice *dev, unsigned offset)
{
if (get_gpio_flag(dev, offset, GPIOF_OUTPUT))
return GPIOF_OUTPUT;
return GPIOF_INPUT;
}
static int sb_gpio_xlate(struct udevice *dev, struct gpio_desc *desc,
struct fdtdec_phandle_args *args)
{
desc->offset = args->args[0];
if (args->args_count < 2)
return 0;
if (args->args[1] & GPIO_ACTIVE_LOW)
desc->flags |= GPIOD_ACTIVE_LOW;
if (args->args[1] & 2)
desc->flags |= GPIOD_IS_IN;
if (args->args[1] & 4)
desc->flags |= GPIOD_IS_OUT;
if (args->args[1] & 8)
desc->flags |= GPIOD_IS_OUT_ACTIVE;
return 0;
}
static const struct dm_gpio_ops gpio_sandbox_ops = {
.direction_input = sb_gpio_direction_input,
.direction_output = sb_gpio_direction_output,
.get_value = sb_gpio_get_value,
.set_value = sb_gpio_set_value,
.get_function = sb_gpio_get_function,
.xlate = sb_gpio_xlate,
};
static int sandbox_gpio_ofdata_to_platdata(struct udevice *dev)
{
struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
uc_priv->gpio_count = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
"num-gpios", 0);
uc_priv->bank_name = fdt_getprop(gd->fdt_blob, dev->of_offset,
"gpio-bank-name", NULL);
return 0;
}
static int gpio_sandbox_probe(struct udevice *dev)
{
struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
if (dev->of_offset == -1) {
/* Tell the uclass how many GPIOs we have */
uc_priv->gpio_count = CONFIG_SANDBOX_GPIO_COUNT;
}
dev->priv = calloc(sizeof(struct gpio_state), uc_priv->gpio_count);
return 0;
}
static int gpio_sandbox_remove(struct udevice *dev)
{
free(dev->priv);
return 0;
}
static const struct udevice_id sandbox_gpio_ids[] = {
{ .compatible = "sandbox,gpio" },
{ }
};
U_BOOT_DRIVER(gpio_sandbox) = {
.name = "gpio_sandbox",
.id = UCLASS_GPIO,
.of_match = sandbox_gpio_ids,
.ofdata_to_platdata = sandbox_gpio_ofdata_to_platdata,
.probe = gpio_sandbox_probe,
.remove = gpio_sandbox_remove,
.ops = &gpio_sandbox_ops,
};
|
