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 #include <dm/acpi.h>
13
14 #define REG_COUNT 0x80
15
sandbox_rtc_get(struct udevice * dev,struct rtc_time * time)16 static int sandbox_rtc_get(struct udevice *dev, struct rtc_time *time)
17 {
18 u8 buf[7];
19 int ret;
20
21 ret = dm_i2c_read(dev, REG_SEC, buf, sizeof(buf));
22 if (ret < 0)
23 return ret;
24
25 time->tm_sec = buf[REG_SEC - REG_SEC];
26 time->tm_min = buf[REG_MIN - REG_SEC];
27 time->tm_hour = buf[REG_HOUR - REG_SEC];
28 time->tm_mday = buf[REG_MDAY - REG_SEC];
29 time->tm_mon = buf[REG_MON - REG_SEC];
30 time->tm_year = buf[REG_YEAR - REG_SEC] + 1900;
31 time->tm_wday = buf[REG_WDAY - REG_SEC];
32
33 return 0;
34 }
35
sandbox_rtc_set(struct udevice * dev,const struct rtc_time * time)36 static int sandbox_rtc_set(struct udevice *dev, const struct rtc_time *time)
37 {
38 u8 buf[7];
39 int ret;
40
41 buf[REG_SEC - REG_SEC] = time->tm_sec;
42 buf[REG_MIN - REG_SEC] = time->tm_min;
43 buf[REG_HOUR - REG_SEC] = time->tm_hour;
44 buf[REG_MDAY - REG_SEC] = time->tm_mday;
45 buf[REG_MON - REG_SEC] = time->tm_mon;
46 buf[REG_YEAR - REG_SEC] = time->tm_year - 1900;
47 buf[REG_WDAY - REG_SEC] = time->tm_wday;
48
49 ret = dm_i2c_write(dev, REG_SEC, buf, sizeof(buf));
50 if (ret < 0)
51 return ret;
52
53 return 0;
54 }
55
sandbox_rtc_reset(struct udevice * dev)56 static int sandbox_rtc_reset(struct udevice *dev)
57 {
58 return dm_i2c_reg_write(dev, REG_RESET, 0);
59 }
60
sandbox_rtc_read8(struct udevice * dev,unsigned int reg)61 static int sandbox_rtc_read8(struct udevice *dev, unsigned int reg)
62 {
63 return dm_i2c_reg_read(dev, reg);
64 }
65
sandbox_rtc_write8(struct udevice * dev,unsigned int reg,int val)66 static int sandbox_rtc_write8(struct udevice *dev, unsigned int reg, int val)
67 {
68 return dm_i2c_reg_write(dev, reg, val);
69 }
70
71 #if CONFIG_IS_ENABLED(ACPIGEN)
sandbox_rtc_get_name(const struct udevice * dev,char * out_name)72 static int sandbox_rtc_get_name(const struct udevice *dev, char *out_name)
73 {
74 return acpi_copy_name(out_name, "RTCC");
75 }
76
77 struct acpi_ops sandbox_rtc_acpi_ops = {
78 .get_name = sandbox_rtc_get_name,
79 };
80 #endif
81
82 static const struct rtc_ops sandbox_rtc_ops = {
83 .get = sandbox_rtc_get,
84 .set = sandbox_rtc_set,
85 .reset = sandbox_rtc_reset,
86 .read8 = sandbox_rtc_read8,
87 .write8 = sandbox_rtc_write8,
88 };
89
90 static const struct udevice_id sandbox_rtc_ids[] = {
91 { .compatible = "sandbox-rtc" },
92 { }
93 };
94
95 U_BOOT_DRIVER(sandbox_rtc) = {
96 .name = "sandbox_rtc",
97 .id = UCLASS_RTC,
98 .of_match = sandbox_rtc_ids,
99 .ops = &sandbox_rtc_ops,
100 ACPI_OPS_PTR(&sandbox_rtc_acpi_ops)
101 };
102