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
|
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2018 Alexander Graf <agraf@suse.de>
*
* Based on drivers/pinctrl/mvebu/pinctrl-mvebu.c and
* drivers/gpio/bcm2835_gpio.c
*
* This driver gets instantiated by the GPIO driver, because both devices
* share the same device node.
* https://spdx.org/licenses
*/
#include <common.h>
#include <config.h>
#include <errno.h>
#include <dm.h>
#include <dm/pinctrl.h>
#include <dm/root.h>
#include <dm/device-internal.h>
#include <dm/lists.h>
#include <asm/system.h>
#include <asm/io.h>
#include <asm/gpio.h>
struct bcm283x_pinctrl_priv {
u32 *base_reg;
};
#define MAX_PINS_PER_BANK 16
static void bcm2835_gpio_set_func_id(struct udevice *dev, unsigned int gpio,
int func)
{
struct bcm283x_pinctrl_priv *priv = dev_get_priv(dev);
int reg_offset;
int field_offset;
reg_offset = BCM2835_GPIO_FSEL_BANK(gpio);
field_offset = BCM2835_GPIO_FSEL_SHIFT(gpio);
clrsetbits_le32(&priv->base_reg[reg_offset],
BCM2835_GPIO_FSEL_MASK << field_offset,
(func & BCM2835_GPIO_FSEL_MASK) << field_offset);
}
static int bcm2835_gpio_get_func_id(struct udevice *dev, unsigned int gpio)
{
struct bcm283x_pinctrl_priv *priv = dev_get_priv(dev);
u32 val;
val = readl(&priv->base_reg[BCM2835_GPIO_FSEL_BANK(gpio)]);
return (val >> BCM2835_GPIO_FSEL_SHIFT(gpio) & BCM2835_GPIO_FSEL_MASK);
}
/*
* bcm283x_pinctrl_set_state: configure pin functions.
* @dev: the pinctrl device to be configured.
* @config: the state to be configured.
* @return: 0 in success
*/
int bcm283x_pinctrl_set_state(struct udevice *dev, struct udevice *config)
{
u32 pin_arr[MAX_PINS_PER_BANK];
u32 function;
int i, len, pin_count = 0;
if (!dev_read_prop(config, "brcm,pins", &len) || !len ||
len & 0x3 || dev_read_u32_array(config, "brcm,pins", pin_arr,
len / sizeof(u32))) {
debug("Failed reading pins array for pinconfig %s (%d)\n",
config->name, len);
return -EINVAL;
}
pin_count = len / sizeof(u32);
function = dev_read_u32_default(config, "brcm,function", -1);
if (function < 0) {
debug("Failed reading function for pinconfig %s (%d)\n",
config->name, function);
return -EINVAL;
}
for (i = 0; i < pin_count; i++)
bcm2835_gpio_set_func_id(dev, pin_arr[i], function);
return 0;
}
static int bcm283x_pinctrl_get_gpio_mux(struct udevice *dev, int banknum,
int index)
{
if (banknum != 0)
return -EINVAL;
return bcm2835_gpio_get_func_id(dev, index);
}
static const struct udevice_id bcm2835_pinctrl_id[] = {
{.compatible = "brcm,bcm2835-gpio"},
{}
};
int bcm283x_pinctl_probe(struct udevice *dev)
{
struct bcm283x_pinctrl_priv *priv;
int ret;
struct udevice *pdev;
priv = dev_get_priv(dev);
if (!priv) {
debug("%s: Failed to get private\n", __func__);
return -EINVAL;
}
priv->base_reg = dev_read_addr_ptr(dev);
if (priv->base_reg == (void *)FDT_ADDR_T_NONE) {
debug("%s: Failed to get base address\n", __func__);
return -EINVAL;
}
/* Create GPIO device as well */
ret = device_bind(dev, lists_driver_lookup_name("gpio_bcm2835"),
"gpio_bcm2835", NULL, dev_of_offset(dev), &pdev);
if (ret) {
/*
* While we really want the pinctrl driver to work to make
* devices go where they should go, the GPIO controller is
* not quite as crucial as it's only rarely used, so don't
* fail here.
*/
printf("Failed to bind GPIO driver\n");
}
return 0;
}
static struct pinctrl_ops bcm283x_pinctrl_ops = {
.set_state = bcm283x_pinctrl_set_state,
.get_gpio_mux = bcm283x_pinctrl_get_gpio_mux,
};
U_BOOT_DRIVER(pinctrl_bcm283x) = {
.name = "bcm283x_pinctrl",
.id = UCLASS_PINCTRL,
.of_match = of_match_ptr(bcm2835_pinctrl_id),
.priv_auto_alloc_size = sizeof(struct bcm283x_pinctrl_priv),
.ops = &bcm283x_pinctrl_ops,
.probe = bcm283x_pinctl_probe,
.flags = DM_FLAG_PRE_RELOC,
};
|
