blob: bad61c377f31097da8f32f01dabe701a9728f460 [file] [log] [blame]
Tom Rini83d290c2018-05-06 17:58:06 -04001// SPDX-License-Identifier: GPL-2.0+
Simon Glassdd18e5d2015-04-20 12:37:24 -06002/*
3 * Simulate an I2C real time clock
4 *
5 * Copyright (c) 2015 Google, Inc
6 * Written by Simon Glass <sjg@chromium.org>
Simon Glassdd18e5d2015-04-20 12:37:24 -06007 */
8
9/*
10 * This is a test driver. It starts off with the current time of the machine,
11 * but also supports setting the time, using an offset from the current
12 * clock. This driver is only intended for testing, not accurate
13 * time-keeping. It does not change the system time.
14 */
15
16#include <common.h>
17#include <dm.h>
Simon Glassdd18e5d2015-04-20 12:37:24 -060018#include <i2c.h>
19#include <os.h>
20#include <rtc.h>
21#include <asm/rtc.h>
22#include <asm/test.h>
23
24#ifdef DEBUG
25#define debug_buffer print_buffer
26#else
27#define debug_buffer(x, ...)
28#endif
29
Simon Glassdd18e5d2015-04-20 12:37:24 -060030/**
31 * struct sandbox_i2c_rtc_plat_data - platform data for the RTC
32 *
33 * @base_time: Base system time when RTC device was bound
34 * @offset: RTC offset from current system time
35 * @use_system_time: true to use system time, false to use @base_time
36 * @reg: Register values
37 */
38struct sandbox_i2c_rtc_plat_data {
39 long base_time;
40 long offset;
41 bool use_system_time;
42 u8 reg[REG_COUNT];
43};
44
45struct sandbox_i2c_rtc {
46 unsigned int offset_secs;
47};
48
49long sandbox_i2c_rtc_set_offset(struct udevice *dev, bool use_system_time,
50 int offset)
51{
52 struct sandbox_i2c_rtc_plat_data *plat = dev_get_platdata(dev);
53 long old_offset;
54
55 old_offset = plat->offset;
56 plat->use_system_time = use_system_time;
57 if (offset != -1)
58 plat->offset = offset;
59
60 return old_offset;
61}
62
63long sandbox_i2c_rtc_get_set_base_time(struct udevice *dev, long base_time)
64{
65 struct sandbox_i2c_rtc_plat_data *plat = dev_get_platdata(dev);
66 long old_base_time;
67
68 old_base_time = plat->base_time;
69 if (base_time != -1)
70 plat->base_time = base_time;
71
72 return old_base_time;
73}
74
75static void reset_time(struct udevice *dev)
76{
77 struct sandbox_i2c_rtc_plat_data *plat = dev_get_platdata(dev);
78 struct rtc_time now;
79
80 os_localtime(&now);
81 plat->base_time = rtc_mktime(&now);
82 plat->offset = 0;
83 plat->use_system_time = true;
84}
85
86static int sandbox_i2c_rtc_get(struct udevice *dev, struct rtc_time *time)
87{
88 struct sandbox_i2c_rtc_plat_data *plat = dev_get_platdata(dev);
89 struct rtc_time tm_now;
90 long now;
91
92 if (plat->use_system_time) {
93 os_localtime(&tm_now);
94 now = rtc_mktime(&tm_now);
95 } else {
96 now = plat->base_time;
97 }
98
99 return rtc_to_tm(now + plat->offset, time);
100}
101
102static int sandbox_i2c_rtc_set(struct udevice *dev, const struct rtc_time *time)
103{
104 struct sandbox_i2c_rtc_plat_data *plat = dev_get_platdata(dev);
105 struct rtc_time tm_now;
106 long now;
107
108 if (plat->use_system_time) {
109 os_localtime(&tm_now);
110 now = rtc_mktime(&tm_now);
111 } else {
112 now = plat->base_time;
113 }
114 plat->offset = rtc_mktime(time) - now;
115
116 return 0;
117}
118
119/* Update the current time in the registers */
120static int sandbox_i2c_rtc_prepare_read(struct udevice *emul)
121{
122 struct sandbox_i2c_rtc_plat_data *plat = dev_get_platdata(emul);
123 struct rtc_time time;
124 int ret;
125
126 ret = sandbox_i2c_rtc_get(emul, &time);
127 if (ret)
128 return ret;
129
130 plat->reg[REG_SEC] = time.tm_sec;
131 plat->reg[REG_MIN] = time.tm_min;
132 plat->reg[REG_HOUR] = time.tm_hour;
133 plat->reg[REG_MDAY] = time.tm_mday;
134 plat->reg[REG_MON] = time.tm_mon;
135 plat->reg[REG_YEAR] = time.tm_year - 1900;
136 plat->reg[REG_WDAY] = time.tm_wday;
137
138 return 0;
139}
140
141static int sandbox_i2c_rtc_complete_write(struct udevice *emul)
142{
143 struct sandbox_i2c_rtc_plat_data *plat = dev_get_platdata(emul);
144 struct rtc_time time;
145 int ret;
146
147 time.tm_sec = plat->reg[REG_SEC];
148 time.tm_min = plat->reg[REG_MIN];
149 time.tm_hour = plat->reg[REG_HOUR];
150 time.tm_mday = plat->reg[REG_MDAY];
151 time.tm_mon = plat->reg[REG_MON];
152 time.tm_year = plat->reg[REG_YEAR] + 1900;
153 time.tm_wday = plat->reg[REG_WDAY];
154
155 ret = sandbox_i2c_rtc_set(emul, &time);
156 if (ret)
157 return ret;
158
159 return 0;
160}
161
162static int sandbox_i2c_rtc_xfer(struct udevice *emul, struct i2c_msg *msg,
163 int nmsgs)
164{
165 struct sandbox_i2c_rtc_plat_data *plat = dev_get_platdata(emul);
166 uint offset = 0;
167 int ret;
168
169 debug("\n%s\n", __func__);
170 ret = sandbox_i2c_rtc_prepare_read(emul);
171 if (ret)
172 return ret;
173 for (; nmsgs > 0; nmsgs--, msg++) {
174 int len;
175 u8 *ptr;
176
177 len = msg->len;
178 debug(" %s: msg->len=%d",
179 msg->flags & I2C_M_RD ? "read" : "write",
180 msg->len);
181 if (msg->flags & I2C_M_RD) {
182 debug(", offset %x, len %x: ", offset, len);
183
184 /* Read the register */
185 memcpy(msg->buf, plat->reg + offset, len);
186 memset(msg->buf + len, '\xff', msg->len - len);
187 debug_buffer(0, msg->buf, 1, msg->len, 0);
188 } else if (len >= 1) {
189 ptr = msg->buf;
190 offset = *ptr++ & (REG_COUNT - 1);
191 len--;
192 debug(", set offset %x: ", offset);
193 debug_buffer(0, msg->buf, 1, msg->len, 0);
194
195 /* Write the register */
196 memcpy(plat->reg + offset, ptr, len);
197 if (offset == REG_RESET)
198 reset_time(emul);
199 }
200 }
201 ret = sandbox_i2c_rtc_complete_write(emul);
202 if (ret)
203 return ret;
204
205 return 0;
206}
207
208struct dm_i2c_ops sandbox_i2c_rtc_emul_ops = {
209 .xfer = sandbox_i2c_rtc_xfer,
210};
211
212static int sandbox_i2c_rtc_bind(struct udevice *dev)
213{
214 reset_time(dev);
215
216 return 0;
217}
218
219static const struct udevice_id sandbox_i2c_rtc_ids[] = {
220 { .compatible = "sandbox,i2c-rtc" },
221 { }
222};
223
224U_BOOT_DRIVER(sandbox_i2c_rtc_emul) = {
225 .name = "sandbox_i2c_rtc_emul",
226 .id = UCLASS_I2C_EMUL,
227 .of_match = sandbox_i2c_rtc_ids,
228 .bind = sandbox_i2c_rtc_bind,
229 .priv_auto_alloc_size = sizeof(struct sandbox_i2c_rtc),
230 .platdata_auto_alloc_size = sizeof(struct sandbox_i2c_rtc_plat_data),
231 .ops = &sandbox_i2c_rtc_emul_ops,
232};