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
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
|
// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2017
* Mario Six, Guntermann & Drunck GmbH, mario.six@gdsys.cc
*/
#include <common.h>
#include <dm.h>
#include <board.h>
#include <i2c.h>
#include <log.h>
#include <asm/gpio.h>
#include "gazerbeam.h"
/* Sequence number of I2C bus that holds the GPIO expanders */
static const int I2C_BUS_SEQ_NO = 1;
/* I2C address of SC/MC2 expander */
static const int MC2_EXPANDER_ADDR = 0x20;
/* I2C address of MC4 expander */
static const int MC4_EXPANDER_ADDR = 0x22;
/* Number of the GPIO to read the SC data from */
static const int SC_GPIO_NO;
/* Number of the GPIO to read the CON data from */
static const int CON_GPIO_NO = 1;
/**
* struct board_gazerbeam_priv - Private data structure for the gazerbeam board
* driver.
* @reset_gpios: GPIOs for the board's reset GPIOs.
* @var_gpios: GPIOs for the board's hardware variant GPIOs
* @ver_gpios: GPIOs for the board's hardware version GPIOs
* @variant: Container for the board's hardware variant (CON/CPU)
* @multichannel: Container for the board's multichannel variant (MC4/MC2/SC)
* @hwversion: Container for the board's hardware version
*/
struct board_gazerbeam_priv {
struct gpio_desc reset_gpios[2];
struct gpio_desc var_gpios[2];
struct gpio_desc ver_gpios[4];
int variant;
int multichannel;
int hwversion;
};
/**
* _read_board_variant_data() - Read variant information from the hardware.
* @dev: The board device for which to determine the multichannel and device
* type information.
*
* The data read from the board's hardware (mostly hard-wired GPIOs) is stored
* in the private data structure of the driver to be used by other driver
* methods.
*
* Return: 0 if OK, -ve on error.
*/
static int _read_board_variant_data(struct udevice *dev)
{
struct board_gazerbeam_priv *priv = dev_get_priv(dev);
struct udevice *i2c_bus;
struct udevice *dummy;
char *listname;
int mc4, mc2, sc, mc2_sc, con;
int gpio_num;
int res;
res = uclass_get_device_by_seq(UCLASS_I2C, I2C_BUS_SEQ_NO, &i2c_bus);
if (res) {
debug("%s: Could not get I2C bus %d (err = %d)\n",
dev->name, I2C_BUS_SEQ_NO, res);
return res;
}
if (!i2c_bus) {
debug("%s: Could not get I2C bus %d\n",
dev->name, I2C_BUS_SEQ_NO);
return -EIO;
}
mc2_sc = !dm_i2c_probe(i2c_bus, MC2_EXPANDER_ADDR, 0, &dummy);
mc4 = !dm_i2c_probe(i2c_bus, MC4_EXPANDER_ADDR, 0, &dummy);
if (mc2_sc && mc4) {
debug("%s: Board hardware configuration inconsistent.\n",
dev->name);
return -EINVAL;
}
listname = mc2_sc ? "var-gpios-mc2" : "var-gpios-mc4";
gpio_num = gpio_request_list_by_name(dev, listname, priv->var_gpios,
ARRAY_SIZE(priv->var_gpios),
GPIOD_IS_IN);
if (gpio_num < 0) {
debug("%s: Requesting gpio list %s failed (err = %d).\n",
dev->name, listname, gpio_num);
return gpio_num;
}
sc = dm_gpio_get_value(&priv->var_gpios[SC_GPIO_NO]);
if (sc < 0) {
debug("%s: Error while reading 'sc' GPIO (err = %d)",
dev->name, sc);
return sc;
}
mc2 = mc2_sc ? (sc ? 0 : 1) : 0;
if ((sc && mc2) || (sc && mc4) || (!sc && !mc2 && !mc4)) {
debug("%s: Board hardware configuration inconsistent.\n",
dev->name);
return -EINVAL;
}
con = dm_gpio_get_value(&priv->var_gpios[CON_GPIO_NO]);
if (con < 0) {
debug("%s: Error while reading 'con' GPIO (err = %d)",
dev->name, con);
return con;
}
priv->variant = con ? VAR_CON : VAR_CPU;
priv->multichannel = mc4 ? 4 : (mc2 ? 2 : (sc ? 1 : 0));
return 0;
}
/**
* _read_hwversion() - Read the hardware version from the board.
* @dev: The board device for which to read the hardware version.
*
* The hardware version read from the board (from hard-wired GPIOs) is stored
* in the private data structure of the driver to be used by other driver
* methods.
*
* Return: 0 if OK, -ve on error.
*/
static int _read_hwversion(struct udevice *dev)
{
struct board_gazerbeam_priv *priv = dev_get_priv(dev);
int res;
res = gpio_request_list_by_name(dev, "ver-gpios", priv->ver_gpios,
ARRAY_SIZE(priv->ver_gpios),
GPIOD_IS_IN);
if (res < 0) {
debug("%s: Error getting GPIO list 'ver-gpios' (err = %d)\n",
dev->name, res);
return -ENODEV;
}
res = dm_gpio_get_values_as_int(priv->ver_gpios,
ARRAY_SIZE(priv->ver_gpios));
if (res < 0) {
debug("%s: Error reading HW version from expander (err = %d)\n",
dev->name, res);
return res;
}
priv->hwversion = res;
res = gpio_free_list(dev, priv->ver_gpios, ARRAY_SIZE(priv->ver_gpios));
if (res < 0) {
debug("%s: Error freeing HW version GPIO list (err = %d)\n",
dev->name, res);
return res;
}
return 0;
}
static int board_gazerbeam_detect(struct udevice *dev)
{
int res;
res = _read_board_variant_data(dev);
if (res) {
debug("%s: Error reading multichannel variant (err = %d)\n",
dev->name, res);
return res;
}
res = _read_hwversion(dev);
if (res) {
debug("%s: Error reading hardware version (err = %d)\n",
dev->name, res);
return res;
}
return 0;
}
static int board_gazerbeam_get_int(struct udevice *dev, int id, int *val)
{
struct board_gazerbeam_priv *priv = dev_get_priv(dev);
switch (id) {
case BOARD_MULTICHANNEL:
*val = priv->multichannel;
break;
case BOARD_VARIANT:
*val = priv->variant;
break;
case BOARD_HWVERSION:
*val = priv->hwversion;
break;
default:
debug("%s: Integer value %d unknown\n", dev->name, id);
return -EINVAL;
}
return 0;
}
static const struct udevice_id board_gazerbeam_ids[] = {
{ .compatible = "gdsys,board_gazerbeam" },
{ /* sentinel */ }
};
static const struct board_ops board_gazerbeam_ops = {
.detect = board_gazerbeam_detect,
.get_int = board_gazerbeam_get_int,
};
static int board_gazerbeam_probe(struct udevice *dev)
{
struct board_gazerbeam_priv *priv = dev_get_priv(dev);
int gpio_num, i;
gpio_num = gpio_request_list_by_name(dev, "reset-gpios",
priv->reset_gpios,
ARRAY_SIZE(priv->reset_gpios),
GPIOD_IS_OUT);
if (gpio_num < 0) {
debug("%s: Error getting GPIO list 'reset-gpios' (err = %d)\n",
dev->name, gpio_num);
return gpio_num;
}
/* Set startup-finished GPIOs */
for (i = 0; i < ARRAY_SIZE(priv->reset_gpios); i++) {
int res = dm_gpio_set_value(&priv->reset_gpios[i], 0);
if (res) {
debug("%s: Error while setting GPIO %d (err = %d)\n",
dev->name, i, res);
return res;
}
}
return 0;
}
U_BOOT_DRIVER(board_gazerbeam) = {
.name = "board_gazerbeam",
.id = UCLASS_BOARD,
.of_match = board_gazerbeam_ids,
.ops = &board_gazerbeam_ops,
.priv_auto_alloc_size = sizeof(struct board_gazerbeam_priv),
.probe = board_gazerbeam_probe,
};
|
