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 <dm.h>
8 #include <i2c.h>
9 #include <rtc.h>
10 #include <asm/rtc.h>
11 #include <dm/acpi.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 u8 buf[7];
18 int ret;
19
20 ret = dm_i2c_read(dev, REG_SEC, buf, sizeof(buf));
21 if (ret < 0)
22 return ret;
23
24 time->tm_sec = buf[REG_SEC - REG_SEC];
25 time->tm_min = buf[REG_MIN - REG_SEC];
26 time->tm_hour = buf[REG_HOUR - REG_SEC];
27 time->tm_mday = buf[REG_MDAY - REG_SEC];
28 time->tm_mon = buf[REG_MON - REG_SEC];
29 time->tm_year = buf[REG_YEAR - REG_SEC] + 1900;
30 time->tm_wday = buf[REG_WDAY - REG_SEC];
31
32 return 0;
33 }
34
sandbox_rtc_set(struct udevice * dev,const struct rtc_time * time)35 static int sandbox_rtc_set(struct udevice *dev, const struct rtc_time *time)
36 {
37 u8 buf[7];
38 int ret;
39
40 buf[REG_SEC - REG_SEC] = time->tm_sec;
41 buf[REG_MIN - REG_SEC] = time->tm_min;
42 buf[REG_HOUR - REG_SEC] = time->tm_hour;
43 buf[REG_MDAY - REG_SEC] = time->tm_mday;
44 buf[REG_MON - REG_SEC] = time->tm_mon;
45 buf[REG_YEAR - REG_SEC] = time->tm_year - 1900;
46 buf[REG_WDAY - REG_SEC] = time->tm_wday;
47
48 ret = dm_i2c_write(dev, REG_SEC, buf, sizeof(buf));
49 if (ret < 0)
50 return ret;
51
52 return 0;
53 }
54
sandbox_rtc_reset(struct udevice * dev)55 static int sandbox_rtc_reset(struct udevice *dev)
56 {
57 return dm_i2c_reg_write(dev, REG_RESET, 0);
58 }
59
sandbox_rtc_read8(struct udevice * dev,unsigned int reg)60 static int sandbox_rtc_read8(struct udevice *dev, unsigned int reg)
61 {
62 return dm_i2c_reg_read(dev, reg);
63 }
64
sandbox_rtc_write8(struct udevice * dev,unsigned int reg,int val)65 static int sandbox_rtc_write8(struct udevice *dev, unsigned int reg, int val)
66 {
67 return dm_i2c_reg_write(dev, reg, val);
68 }
69
70 #if CONFIG_IS_ENABLED(ACPIGEN)
sandbox_rtc_get_name(const struct udevice * dev,char * out_name)71 static int sandbox_rtc_get_name(const struct udevice *dev, char *out_name)
72 {
73 return acpi_copy_name(out_name, "RTCC");
74 }
75
76 struct acpi_ops sandbox_rtc_acpi_ops = {
77 .get_name = sandbox_rtc_get_name,
78 };
79 #endif
80
sandbox_rtc_bind(struct udevice * dev)81 static int sandbox_rtc_bind(struct udevice *dev)
82 {
83 #if CONFIG_IS_ENABLED(PLATDATA)
84 struct sandbox_i2c_rtc_plat_data *plat = dev_get_plat(dev);
85
86 /* Set up the emul_idx for i2c_emul_find() */
87 i2c_emul_set_idx(dev, plat->dtplat.sandbox_emul->idx);
88 #endif
89
90 return 0;
91 }
92
93 static const struct rtc_ops sandbox_rtc_ops = {
94 .get = sandbox_rtc_get,
95 .set = sandbox_rtc_set,
96 .reset = sandbox_rtc_reset,
97 .read8 = sandbox_rtc_read8,
98 .write8 = sandbox_rtc_write8,
99 };
100
101 static const struct udevice_id sandbox_rtc_ids[] = {
102 { .compatible = "sandbox-rtc" },
103 { }
104 };
105
106 U_BOOT_DRIVER(sandbox_rtc) = {
107 .name = "sandbox_rtc",
108 .id = UCLASS_RTC,
109 .of_match = sandbox_rtc_ids,
110 .ops = &sandbox_rtc_ops,
111 .bind = sandbox_rtc_bind,
112 ACPI_OPS_PTR(&sandbox_rtc_acpi_ops)
113 };
114