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
|
/*
* This file is part of the coreboot project.
*
* Copyright 2016 Google Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <arch/acpi_device.h>
#include <arch/acpigen.h>
#include <console/console.h>
#include <device/i2c_simple.h>
#include <device/device.h>
#include <device/path.h>
#include <gpio.h>
#include <stdint.h>
#include <string.h>
#include "chip.h"
#if IS_ENABLED(CONFIG_HAVE_ACPI_TABLES)
static bool i2c_generic_add_gpios_to_crs(struct drivers_i2c_generic_config *cfg)
{
/*
* Return false if:
* 1. Request to explicitly disable export of GPIOs in CRS, or
* 2. Both reset and enable GPIOs are not provided.
*/
if (cfg->disable_gpio_export_in_crs ||
((cfg->reset_gpio.pin_count == 0) &&
(cfg->enable_gpio.pin_count == 0)))
return false;
return true;
}
static int i2c_generic_write_gpio(struct acpi_gpio *gpio, int *curr_index)
{
int ret = -1;
if (gpio->pin_count == 0)
return ret;
acpi_device_write_gpio(gpio);
ret = *curr_index;
(*curr_index)++;
return ret;
}
void i2c_generic_fill_ssdt(struct device *dev,
void (*callback)(struct device *dev),
struct drivers_i2c_generic_config *config)
{
const char *scope = acpi_device_scope(dev);
struct acpi_i2c i2c = {
.address = dev->path.i2c.device,
.mode_10bit = dev->path.i2c.mode_10bit,
.speed = config->speed ? : I2C_SPEED_FAST,
.resource = scope,
};
struct acpi_dp *dsd = NULL;
int curr_index = 0;
int reset_gpio_index = -1, enable_gpio_index = -1, irq_gpio_index = -1;
const char *path = acpi_device_path(dev);
if (!dev->enabled || !scope)
return;
if (!config->hid) {
printk(BIOS_ERR, "%s: ERROR: HID required\n", dev_path(dev));
return;
}
/* Device */
acpigen_write_scope(scope);
acpigen_write_device(acpi_device_name(dev));
acpigen_write_name_string("_HID", config->hid);
if (config->cid)
acpigen_write_name_string("_CID", config->cid);
acpigen_write_name_integer("_UID", config->uid);
acpigen_write_name_string("_DDN", config->desc);
acpigen_write_STA(ACPI_STATUS_DEVICE_ALL_ON);
/* Resources */
acpigen_write_name("_CRS");
acpigen_write_resourcetemplate_header();
acpi_device_write_i2c(&i2c);
/* Use either Interrupt() or GpioInt() */
if (config->irq_gpio.pin_count)
irq_gpio_index = i2c_generic_write_gpio(&config->irq_gpio,
&curr_index);
else
acpi_device_write_interrupt(&config->irq);
if (i2c_generic_add_gpios_to_crs(config) == true) {
reset_gpio_index = i2c_generic_write_gpio(&config->reset_gpio,
&curr_index);
enable_gpio_index = i2c_generic_write_gpio(&config->enable_gpio,
&curr_index);
}
acpigen_write_resourcetemplate_footer();
/* Wake capabilities */
if (config->wake) {
acpigen_write_name_integer("_S0W", 4);
acpigen_write_PRW(config->wake, 3);
}
/* DSD */
if (config->probed || config->property_count ||
(reset_gpio_index != -1) ||
(enable_gpio_index != -1) || (irq_gpio_index != -1)) {
dsd = acpi_dp_new_table("_DSD");
if (config->probed)
acpi_dp_add_integer(dsd, "linux,probed", 1);
if (irq_gpio_index != -1)
acpi_dp_add_gpio(dsd, "irq-gpios", path,
irq_gpio_index, 0,
config->irq_gpio.polarity ==
ACPI_GPIO_ACTIVE_LOW);
if (reset_gpio_index != -1)
acpi_dp_add_gpio(dsd, "reset-gpios", path,
reset_gpio_index, 0,
config->reset_gpio.polarity);
if (enable_gpio_index != -1)
acpi_dp_add_gpio(dsd, "enable-gpios", path,
enable_gpio_index, 0,
config->enable_gpio.polarity);
/* Add generic property list */
acpi_dp_add_property_list(dsd, config->property_list,
config->property_count);
acpi_dp_write(dsd);
}
/* Power Resource */
if (config->has_power_resource)
acpi_device_add_power_res(
&config->reset_gpio, config->reset_delay_ms,
&config->enable_gpio, config->enable_delay_ms);
/* Callback if any. */
if (callback)
callback(dev);
acpigen_pop_len(); /* Device */
acpigen_pop_len(); /* Scope */
printk(BIOS_INFO, "%s: %s at %s\n", path,
config->desc ? : dev->chip_ops->name, dev_path(dev));
}
static void i2c_generic_fill_ssdt_generator(struct device *dev)
{
i2c_generic_fill_ssdt(dev, NULL, dev->chip_info);
}
/* Use name specified in config or build one from I2C address */
static const char *i2c_generic_acpi_name(struct device *dev)
{
struct drivers_i2c_generic_config *config = dev->chip_info;
static char name[5];
if (config->name)
return config->name;
snprintf(name, sizeof(name), "D%03.3X", dev->path.i2c.device);
name[4] = '\0';
return name;
}
#endif
static struct device_operations i2c_generic_ops = {
.read_resources = DEVICE_NOOP,
.set_resources = DEVICE_NOOP,
.enable_resources = DEVICE_NOOP,
#if IS_ENABLED(CONFIG_HAVE_ACPI_TABLES)
.acpi_name = &i2c_generic_acpi_name,
.acpi_fill_ssdt_generator = &i2c_generic_fill_ssdt_generator,
#endif
};
static void i2c_generic_enable(struct device *dev)
{
struct drivers_i2c_generic_config *config = dev->chip_info;
/* Check if device is present by reading GPIO */
if (config->device_present_gpio) {
int present = gpio_get(config->device_present_gpio);
present ^= config->device_present_gpio_invert;
printk(BIOS_INFO, "%s is %spresent\n",
dev->chip_ops->name, present ? "" : "not ");
if (!present) {
dev->enabled = 0;
return;
}
}
dev->ops = &i2c_generic_ops;
}
struct chip_operations drivers_i2c_generic_ops = {
CHIP_NAME("I2C Device")
.enable_dev = &i2c_generic_enable
};
|
