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
|
/*
* Simulate an I2C real time clock
*
* Copyright (c) 2015 Google, Inc
* Written by Simon Glass <sjg@chromium.org>
*
* SPDX-License-Identifier: GPL-2.0+
*/
/*
* This is a test driver. It starts off with the current time of the machine,
* but also supports setting the time, using an offset from the current
* clock. This driver is only intended for testing, not accurate
* time-keeping. It does not change the system time.
*/
#include <common.h>
#include <dm.h>
#include <i2c.h>
#include <os.h>
#include <rtc.h>
#include <asm/rtc.h>
#include <asm/test.h>
#ifdef DEBUG
#define debug_buffer print_buffer
#else
#define debug_buffer(x, ...)
#endif
DECLARE_GLOBAL_DATA_PTR;
/**
* struct sandbox_i2c_rtc_plat_data - platform data for the RTC
*
* @base_time: Base system time when RTC device was bound
* @offset: RTC offset from current system time
* @use_system_time: true to use system time, false to use @base_time
* @reg: Register values
*/
struct sandbox_i2c_rtc_plat_data {
long base_time;
long offset;
bool use_system_time;
u8 reg[REG_COUNT];
};
struct sandbox_i2c_rtc {
unsigned int offset_secs;
};
long sandbox_i2c_rtc_set_offset(struct udevice *dev, bool use_system_time,
int offset)
{
struct sandbox_i2c_rtc_plat_data *plat = dev_get_platdata(dev);
long old_offset;
old_offset = plat->offset;
plat->use_system_time = use_system_time;
if (offset != -1)
plat->offset = offset;
return old_offset;
}
long sandbox_i2c_rtc_get_set_base_time(struct udevice *dev, long base_time)
{
struct sandbox_i2c_rtc_plat_data *plat = dev_get_platdata(dev);
long old_base_time;
old_base_time = plat->base_time;
if (base_time != -1)
plat->base_time = base_time;
return old_base_time;
}
static void reset_time(struct udevice *dev)
{
struct sandbox_i2c_rtc_plat_data *plat = dev_get_platdata(dev);
struct rtc_time now;
os_localtime(&now);
plat->base_time = rtc_mktime(&now);
plat->offset = 0;
plat->use_system_time = true;
}
static int sandbox_i2c_rtc_get(struct udevice *dev, struct rtc_time *time)
{
struct sandbox_i2c_rtc_plat_data *plat = dev_get_platdata(dev);
struct rtc_time tm_now;
long now;
if (plat->use_system_time) {
os_localtime(&tm_now);
now = rtc_mktime(&tm_now);
} else {
now = plat->base_time;
}
return rtc_to_tm(now + plat->offset, time);
}
static int sandbox_i2c_rtc_set(struct udevice *dev, const struct rtc_time *time)
{
struct sandbox_i2c_rtc_plat_data *plat = dev_get_platdata(dev);
struct rtc_time tm_now;
long now;
if (plat->use_system_time) {
os_localtime(&tm_now);
now = rtc_mktime(&tm_now);
} else {
now = plat->base_time;
}
plat->offset = rtc_mktime(time) - now;
return 0;
}
/* Update the current time in the registers */
static int sandbox_i2c_rtc_prepare_read(struct udevice *emul)
{
struct sandbox_i2c_rtc_plat_data *plat = dev_get_platdata(emul);
struct rtc_time time;
int ret;
ret = sandbox_i2c_rtc_get(emul, &time);
if (ret)
return ret;
plat->reg[REG_SEC] = time.tm_sec;
plat->reg[REG_MIN] = time.tm_min;
plat->reg[REG_HOUR] = time.tm_hour;
plat->reg[REG_MDAY] = time.tm_mday;
plat->reg[REG_MON] = time.tm_mon;
plat->reg[REG_YEAR] = time.tm_year - 1900;
plat->reg[REG_WDAY] = time.tm_wday;
return 0;
}
static int sandbox_i2c_rtc_complete_write(struct udevice *emul)
{
struct sandbox_i2c_rtc_plat_data *plat = dev_get_platdata(emul);
struct rtc_time time;
int ret;
time.tm_sec = plat->reg[REG_SEC];
time.tm_min = plat->reg[REG_MIN];
time.tm_hour = plat->reg[REG_HOUR];
time.tm_mday = plat->reg[REG_MDAY];
time.tm_mon = plat->reg[REG_MON];
time.tm_year = plat->reg[REG_YEAR] + 1900;
time.tm_wday = plat->reg[REG_WDAY];
ret = sandbox_i2c_rtc_set(emul, &time);
if (ret)
return ret;
return 0;
}
static int sandbox_i2c_rtc_xfer(struct udevice *emul, struct i2c_msg *msg,
int nmsgs)
{
struct sandbox_i2c_rtc_plat_data *plat = dev_get_platdata(emul);
uint offset = 0;
int ret;
debug("\n%s\n", __func__);
ret = sandbox_i2c_rtc_prepare_read(emul);
if (ret)
return ret;
for (; nmsgs > 0; nmsgs--, msg++) {
int len;
u8 *ptr;
len = msg->len;
debug(" %s: msg->len=%d",
msg->flags & I2C_M_RD ? "read" : "write",
msg->len);
if (msg->flags & I2C_M_RD) {
debug(", offset %x, len %x: ", offset, len);
/* Read the register */
memcpy(msg->buf, plat->reg + offset, len);
memset(msg->buf + len, '\xff', msg->len - len);
debug_buffer(0, msg->buf, 1, msg->len, 0);
} else if (len >= 1) {
ptr = msg->buf;
offset = *ptr++ & (REG_COUNT - 1);
len--;
debug(", set offset %x: ", offset);
debug_buffer(0, msg->buf, 1, msg->len, 0);
/* Write the register */
memcpy(plat->reg + offset, ptr, len);
if (offset == REG_RESET)
reset_time(emul);
}
}
ret = sandbox_i2c_rtc_complete_write(emul);
if (ret)
return ret;
return 0;
}
struct dm_i2c_ops sandbox_i2c_rtc_emul_ops = {
.xfer = sandbox_i2c_rtc_xfer,
};
static int sandbox_i2c_rtc_bind(struct udevice *dev)
{
reset_time(dev);
return 0;
}
static const struct udevice_id sandbox_i2c_rtc_ids[] = {
{ .compatible = "sandbox,i2c-rtc" },
{ }
};
U_BOOT_DRIVER(sandbox_i2c_rtc_emul) = {
.name = "sandbox_i2c_rtc_emul",
.id = UCLASS_I2C_EMUL,
.of_match = sandbox_i2c_rtc_ids,
.bind = sandbox_i2c_rtc_bind,
.priv_auto_alloc_size = sizeof(struct sandbox_i2c_rtc),
.platdata_auto_alloc_size = sizeof(struct sandbox_i2c_rtc_plat_data),
.ops = &sandbox_i2c_rtc_emul_ops,
};
|
