1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * (C) Copyright 2015 Google, Inc
4 * Written by Simon Glass <sjg@chromium.org>
5 */
6
7 #include <common.h>
8 #include <dm.h>
9 #include <i2c.h>
10 #include <rtc.h>
11 #include <asm/rtc.h>
12
13 #define REG_COUNT 0x80
14
sandbox_rtc_get(struct udevice * dev,struct rtc_time * time)15 static int sandbox_rtc_get(struct udevice *dev, struct rtc_time *time)
16 {
17 time->tm_sec = dm_i2c_reg_read(dev, REG_SEC);
18 if (time->tm_sec < 0)
19 return time->tm_sec;
20 time->tm_min = dm_i2c_reg_read(dev, REG_MIN);
21 if (time->tm_min < 0)
22 return time->tm_min;
23 time->tm_hour = dm_i2c_reg_read(dev, REG_HOUR);
24 if (time->tm_hour < 0)
25 return time->tm_hour;
26 time->tm_mday = dm_i2c_reg_read(dev, REG_MDAY);
27 if (time->tm_mday < 0)
28 return time->tm_mday;
29 time->tm_mon = dm_i2c_reg_read(dev, REG_MON);
30 if (time->tm_mon < 0)
31 return time->tm_mon;
32 time->tm_year = dm_i2c_reg_read(dev, REG_YEAR);
33 if (time->tm_year < 0)
34 return time->tm_year;
35 time->tm_year += 1900;
36 time->tm_wday = dm_i2c_reg_read(dev, REG_WDAY);
37 if (time->tm_wday < 0)
38 return time->tm_wday;
39
40 return 0;
41 }
42
sandbox_rtc_set(struct udevice * dev,const struct rtc_time * time)43 static int sandbox_rtc_set(struct udevice *dev, const struct rtc_time *time)
44 {
45 int ret;
46
47 ret = dm_i2c_reg_write(dev, REG_SEC, time->tm_sec);
48 if (ret < 0)
49 return ret;
50 ret = dm_i2c_reg_write(dev, REG_MIN, time->tm_min);
51 if (ret < 0)
52 return ret;
53 ret = dm_i2c_reg_write(dev, REG_HOUR, time->tm_hour);
54 if (ret < 0)
55 return ret;
56 ret = dm_i2c_reg_write(dev, REG_MDAY, time->tm_mday);
57 if (ret < 0)
58 return ret;
59 ret = dm_i2c_reg_write(dev, REG_MON, time->tm_mon);
60 if (ret < 0)
61 return ret;
62 ret = dm_i2c_reg_write(dev, REG_YEAR, time->tm_year - 1900);
63 if (ret < 0)
64 return ret;
65 ret = dm_i2c_reg_write(dev, REG_WDAY, time->tm_wday);
66 if (ret < 0)
67 return ret;
68
69 return 0;
70 }
71
sandbox_rtc_reset(struct udevice * dev)72 static int sandbox_rtc_reset(struct udevice *dev)
73 {
74 return dm_i2c_reg_write(dev, REG_RESET, 0);
75 }
76
sandbox_rtc_read8(struct udevice * dev,unsigned int reg)77 static int sandbox_rtc_read8(struct udevice *dev, unsigned int reg)
78 {
79 return dm_i2c_reg_read(dev, reg);
80 }
81
sandbox_rtc_write8(struct udevice * dev,unsigned int reg,int val)82 static int sandbox_rtc_write8(struct udevice *dev, unsigned int reg, int val)
83 {
84 return dm_i2c_reg_write(dev, reg, val);
85 }
86
87 static const struct rtc_ops sandbox_rtc_ops = {
88 .get = sandbox_rtc_get,
89 .set = sandbox_rtc_set,
90 .reset = sandbox_rtc_reset,
91 .read8 = sandbox_rtc_read8,
92 .write8 = sandbox_rtc_write8,
93 };
94
95 static const struct udevice_id sandbox_rtc_ids[] = {
96 { .compatible = "sandbox-rtc" },
97 { }
98 };
99
100 U_BOOT_DRIVER(rtc_sandbox) = {
101 .name = "rtc-sandbox",
102 .id = UCLASS_RTC,
103 .of_match = sandbox_rtc_ids,
104 .ops = &sandbox_rtc_ops,
105 };
106