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
|
/*
* (C) Copyright 2016 - Beniamino Galvani <b.galvani@gmail.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <dm.h>
#include <dm/pinctrl.h>
#include <fdt_support.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/sizes.h>
#include "pinctrl-meson.h"
DECLARE_GLOBAL_DATA_PTR;
static const char *meson_pinctrl_dummy_name = "_dummy";
static int meson_pinctrl_get_groups_count(struct udevice *dev)
{
struct meson_pinctrl *priv = dev_get_priv(dev);
return priv->data->num_groups;
}
static const char *meson_pinctrl_get_group_name(struct udevice *dev,
unsigned selector)
{
struct meson_pinctrl *priv = dev_get_priv(dev);
if (!priv->data->groups[selector].name)
return meson_pinctrl_dummy_name;
return priv->data->groups[selector].name;
}
static int meson_pinmux_get_functions_count(struct udevice *dev)
{
struct meson_pinctrl *priv = dev_get_priv(dev);
return priv->data->num_funcs;
}
static const char *meson_pinmux_get_function_name(struct udevice *dev,
unsigned selector)
{
struct meson_pinctrl *priv = dev_get_priv(dev);
return priv->data->funcs[selector].name;
}
static void meson_pinmux_disable_other_groups(struct meson_pinctrl *priv,
unsigned int pin, int sel_group)
{
struct meson_pmx_group *group;
void __iomem *addr;
int i, j;
for (i = 0; i < priv->data->num_groups; i++) {
group = &priv->data->groups[i];
if (group->is_gpio || i == sel_group)
continue;
for (j = 0; j < group->num_pins; j++) {
if (group->pins[j] == pin) {
/* We have found a group using the pin */
debug("pinmux: disabling %s\n", group->name);
addr = priv->reg_mux + group->reg * 4;
writel(readl(addr) & ~BIT(group->bit), addr);
}
}
}
}
static int meson_pinmux_group_set(struct udevice *dev,
unsigned group_selector,
unsigned func_selector)
{
struct meson_pinctrl *priv = dev_get_priv(dev);
const struct meson_pmx_group *group;
const struct meson_pmx_func *func;
void __iomem *addr;
int i;
group = &priv->data->groups[group_selector];
func = &priv->data->funcs[func_selector];
debug("pinmux: set group %s func %s\n", group->name, func->name);
/*
* Disable groups using the same pins.
* The selected group is not disabled to avoid glitches.
*/
for (i = 0; i < group->num_pins; i++) {
meson_pinmux_disable_other_groups(priv,
group->pins[i],
group_selector);
}
/* Function 0 (GPIO) doesn't need any additional setting */
if (func_selector) {
addr = priv->reg_mux + group->reg * 4;
writel(readl(addr) | BIT(group->bit), addr);
}
return 0;
}
const struct pinctrl_ops meson_pinctrl_ops = {
.get_groups_count = meson_pinctrl_get_groups_count,
.get_group_name = meson_pinctrl_get_group_name,
.get_functions_count = meson_pinmux_get_functions_count,
.get_function_name = meson_pinmux_get_function_name,
.pinmux_group_set = meson_pinmux_group_set,
.set_state = pinctrl_generic_set_state,
};
static fdt_addr_t parse_address(int offset, const char *name, int na, int ns)
{
int index, len = 0;
const fdt32_t *reg;
index = fdt_stringlist_search(gd->fdt_blob, offset, "reg-names", name);
if (index < 0)
return FDT_ADDR_T_NONE;
reg = fdt_getprop(gd->fdt_blob, offset, "reg", &len);
if (!reg || (len <= (index * sizeof(fdt32_t) * (na + ns))))
return FDT_ADDR_T_NONE;
reg += index * (na + ns);
return fdt_translate_address((void *)gd->fdt_blob, offset, reg);
}
int meson_pinctrl_probe(struct udevice *dev)
{
struct meson_pinctrl *priv = dev_get_priv(dev);
fdt_addr_t addr;
int node, gpio = -1, len;
int na, ns;
na = fdt_address_cells(gd->fdt_blob, dev_of_offset(dev->parent));
if (na < 1) {
debug("bad #address-cells\n");
return -EINVAL;
}
ns = fdt_size_cells(gd->fdt_blob, dev_of_offset(dev->parent));
if (ns < 1) {
debug("bad #size-cells\n");
return -EINVAL;
}
fdt_for_each_subnode(node, gd->fdt_blob, dev_of_offset(dev)) {
if (fdt_getprop(gd->fdt_blob, node, "gpio-controller", &len)) {
gpio = node;
break;
}
}
if (!gpio) {
debug("gpio node not found\n");
return -EINVAL;
}
addr = parse_address(gpio, "mux", na, ns);
if (addr == FDT_ADDR_T_NONE) {
debug("mux not found\n");
return -EINVAL;
}
priv->reg_mux = (void __iomem *)addr;
priv->data = (struct meson_pinctrl_data *)dev_get_driver_data(dev);
return 0;
}
|
