Newer
Older
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
/*
* (C) Copyright 2015 Marek Vasut <marex@denx.de>
*
* DesignWare APB GPIO driver
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <malloc.h>
#include <asm/arch/gpio.h>
#include <asm/gpio.h>
#include <asm/io.h>
#include <dm.h>
#include <dm/device-internal.h>
#include <dm/lists.h>
#include <dm/root.h>
#include <errno.h>
DECLARE_GLOBAL_DATA_PTR;
#define GPIO_SWPORTA_DR 0x00
#define GPIO_SWPORTA_DDR 0x04
#define GPIO_INTEN 0x30
#define GPIO_INTMASK 0x34
#define GPIO_INTTYPE_LEVEL 0x38
#define GPIO_INT_POLARITY 0x3c
#define GPIO_INTSTATUS 0x40
#define GPIO_PORTA_DEBOUNCE 0x48
#define GPIO_PORTA_EOI 0x4c
#define GPIO_EXT_PORTA 0x50
struct gpio_dwapb_platdata {
const char *name;
int bank;
int pins;
fdt_addr_t base;
};
static int dwapb_gpio_direction_input(struct udevice *dev, unsigned pin)
{
struct gpio_dwapb_platdata *plat = dev_get_platdata(dev);
clrbits_le32(plat->base + GPIO_SWPORTA_DDR, 1 << pin);
return 0;
}
static int dwapb_gpio_direction_output(struct udevice *dev, unsigned pin,
int val)
{
struct gpio_dwapb_platdata *plat = dev_get_platdata(dev);
setbits_le32(plat->base + GPIO_SWPORTA_DDR, 1 << pin);
if (val)
setbits_le32(plat->base + GPIO_SWPORTA_DR, 1 << pin);
else
clrbits_le32(plat->base + GPIO_SWPORTA_DR, 1 << pin);
return 0;
}
static int dwapb_gpio_get_value(struct udevice *dev, unsigned pin)
{
struct gpio_dwapb_platdata *plat = dev_get_platdata(dev);
return !!(readl(plat->base + GPIO_EXT_PORTA) & (1 << pin));
}
static int dwapb_gpio_set_value(struct udevice *dev, unsigned pin, int val)
{
struct gpio_dwapb_platdata *plat = dev_get_platdata(dev);
if (val)
setbits_le32(plat->base + GPIO_SWPORTA_DR, 1 << pin);
else
clrbits_le32(plat->base + GPIO_SWPORTA_DR, 1 << pin);
return 0;
}
static const struct dm_gpio_ops gpio_dwapb_ops = {
.direction_input = dwapb_gpio_direction_input,
.direction_output = dwapb_gpio_direction_output,
.get_value = dwapb_gpio_get_value,
.set_value = dwapb_gpio_set_value,
};
static int gpio_dwapb_probe(struct udevice *dev)
{
struct gpio_dev_priv *priv = dev_get_uclass_priv(dev);
struct gpio_dwapb_platdata *plat = dev->platdata;
if (!plat)
return 0;
priv->gpio_count = plat->pins;
priv->bank_name = plat->name;
return 0;
}
static int gpio_dwapb_bind(struct udevice *dev)
{
struct gpio_dwapb_platdata *plat = dev_get_platdata(dev);
const void *blob = gd->fdt_blob;
struct udevice *subdev;
fdt_addr_t base;
int ret, node, bank = 0;
/* If this is a child device, there is nothing to do here */
if (plat)
return 0;
base = fdtdec_get_addr(blob, dev->of_offset, "reg");
if (base == FDT_ADDR_T_NONE) {
debug("Can't get the GPIO register base address\n");
return -ENXIO;
}
for (node = fdt_first_subnode(blob, dev->of_offset);
node > 0;
node = fdt_next_subnode(blob, node)) {
if (!fdtdec_get_bool(blob, node, "gpio-controller"))
continue;
plat = NULL;
plat = calloc(1, sizeof(*plat));
if (!plat)
return -ENOMEM;
plat->base = base;
plat->bank = bank;
plat->pins = fdtdec_get_int(blob, node, "snps,nr-gpios", 0);
ret = fdt_get_string(blob, node, "bank-name", &plat->name);
if (ret)
goto err;
ret = device_bind(dev, dev->driver, plat->name,
plat, -1, &subdev);
if (ret)
goto err;
subdev->of_offset = node;
bank++;
}
return 0;
err:
free(plat);
return ret;
}
static const struct udevice_id gpio_dwapb_ids[] = {
{ .compatible = "snps,dw-apb-gpio" },
{ }
};
U_BOOT_DRIVER(gpio_dwapb) = {
.name = "gpio-dwapb",
.id = UCLASS_GPIO,
.of_match = gpio_dwapb_ids,
.ops = &gpio_dwapb_ops,
.bind = gpio_dwapb_bind,
.probe = gpio_dwapb_probe,
};