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
|
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2015 - 2016 Xilinx, Inc.
* Copyright (C) 2017 National Instruments Corp
* Written by Michal Simek
*/
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <i2c.h>
#include <log.h>
#include <malloc.h>
#include <asm/global_data.h>
#include <asm-generic/gpio.h>
DECLARE_GLOBAL_DATA_PTR;
enum pca_type {
PCA9543,
PCA9544,
PCA9546,
PCA9547,
PCA9548,
PCA9646,
PCA9847,
};
struct chip_desc {
u8 enable; /* Enable mask in ctl register (used for muxes only) */
enum muxtype {
pca954x_ismux = 0,
pca954x_isswi,
} muxtype;
u32 width;
};
struct pca954x_priv {
u32 addr; /* I2C mux address */
u32 width; /* I2C mux width - number of busses */
struct gpio_desc gpio_mux_reset;
};
static const struct chip_desc chips[] = {
[PCA9543] = {
.muxtype = pca954x_isswi,
.width = 2,
},
[PCA9544] = {
.enable = 0x4,
.muxtype = pca954x_ismux,
.width = 4,
},
[PCA9546] = {
.muxtype = pca954x_isswi,
.width = 4,
},
[PCA9547] = {
.enable = 0x8,
.muxtype = pca954x_ismux,
.width = 8,
},
[PCA9548] = {
.muxtype = pca954x_isswi,
.width = 8,
},
[PCA9646] = {
.muxtype = pca954x_isswi,
.width = 4,
},
[PCA9847] = {
.enable = 0x8,
.muxtype = pca954x_ismux,
.width = 8,
},
};
static int pca954x_deselect(struct udevice *mux, struct udevice *bus,
uint channel)
{
struct pca954x_priv *priv = dev_get_priv(mux);
uchar byte = 0;
return dm_i2c_write(mux, priv->addr, &byte, 1);
}
static int pca954x_select(struct udevice *mux, struct udevice *bus,
uint channel)
{
struct pca954x_priv *priv = dev_get_priv(mux);
const struct chip_desc *chip = &chips[dev_get_driver_data(mux)];
uchar byte;
if (chip->muxtype == pca954x_ismux)
byte = channel | chip->enable;
else
byte = 1 << channel;
return dm_i2c_write(mux, priv->addr, &byte, 1);
}
static const struct i2c_mux_ops pca954x_ops = {
.select = pca954x_select,
.deselect = pca954x_deselect,
};
static const struct udevice_id pca954x_ids[] = {
{ .compatible = "nxp,pca9543", .data = PCA9543 },
{ .compatible = "nxp,pca9544", .data = PCA9544 },
{ .compatible = "nxp,pca9546", .data = PCA9546 },
{ .compatible = "nxp,pca9547", .data = PCA9547 },
{ .compatible = "nxp,pca9548", .data = PCA9548 },
{ .compatible = "nxp,pca9646", .data = PCA9646 },
{ .compatible = "nxp,pca9847", .data = PCA9847 },
{ }
};
static int pca954x_of_to_plat(struct udevice *dev)
{
struct pca954x_priv *priv = dev_get_priv(dev);
const struct chip_desc *chip = &chips[dev_get_driver_data(dev)];
priv->addr = dev_read_u32_default(dev, "reg", 0);
if (!priv->addr) {
debug("MUX not found\n");
return -ENODEV;
}
priv->width = chip->width;
if (!priv->width) {
debug("No I2C MUX width specified\n");
return -EINVAL;
}
debug("Device %s at 0x%x with width %d\n",
dev->name, priv->addr, priv->width);
return 0;
}
static int pca954x_probe(struct udevice *dev)
{
if (CONFIG_IS_ENABLED(DM_GPIO)) {
struct pca954x_priv *priv = dev_get_priv(dev);
int err;
err = gpio_request_by_name(dev, "reset-gpios", 0,
&priv->gpio_mux_reset, GPIOD_IS_OUT);
/* it's optional so only bail if we get a real error */
if (err && (err != -ENOENT))
return err;
/* dm will take care of polarity */
if (dm_gpio_is_valid(&priv->gpio_mux_reset))
dm_gpio_set_value(&priv->gpio_mux_reset, 0);
}
return 0;
}
static int pca954x_remove(struct udevice *dev)
{
if (CONFIG_IS_ENABLED(DM_GPIO)) {
struct pca954x_priv *priv = dev_get_priv(dev);
if (dm_gpio_is_valid(&priv->gpio_mux_reset))
dm_gpio_free(dev, &priv->gpio_mux_reset);
}
return 0;
}
U_BOOT_DRIVER(pca954x) = {
.name = "pca954x",
.id = UCLASS_I2C_MUX,
.of_match = pca954x_ids,
.probe = pca954x_probe,
.remove = pca954x_remove,
.ops = &pca954x_ops,
.of_to_plat = pca954x_of_to_plat,
.priv_auto = sizeof(struct pca954x_priv),
};
|
