1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (c), Vaisala Oyj
4 */
5
6 #include <dm.h>
7 #include <dm/device_compat.h>
8 #include <reboot-mode/reboot-mode-rtc.h>
9 #include <reboot-mode/reboot-mode.h>
10 #include <rtc.h>
11
12 DECLARE_GLOBAL_DATA_PTR;
13
reboot_mode_get(struct udevice * dev,u32 * buf)14 static int reboot_mode_get(struct udevice *dev, u32 *buf)
15 {
16 if (!buf)
17 return -EINVAL;
18
19 int ret;
20 u8 *val = (u8 *)buf;
21 struct reboot_mode_rtc_platdata *plat_data;
22
23 plat_data = dev_get_plat(dev);
24 if (!plat_data)
25 return -EINVAL;
26
27 for (int i = 0; i < plat_data->size; i++) {
28 ret = rtc_read8(plat_data->rtc, plat_data->addr + i);
29 if (ret < 0)
30 return ret;
31
32 val[i] = ret;
33 }
34
35 if (plat_data->is_big_endian)
36 *buf = __be32_to_cpu(*buf);
37 else
38 *buf = __le32_to_cpu(*buf);
39
40 return 0;
41 }
42
reboot_mode_set(struct udevice * dev,u32 buf)43 static int reboot_mode_set(struct udevice *dev, u32 buf)
44 {
45 int ret;
46 u8 *val;
47 struct reboot_mode_rtc_platdata *plat_data;
48
49 plat_data = dev_get_plat(dev);
50 if (!plat_data)
51 return -EINVAL;
52
53 if (plat_data->is_big_endian)
54 buf = __cpu_to_be32(buf);
55 else
56 buf = __cpu_to_le32(buf);
57
58 val = (u8 *)&buf;
59
60 for (int i = 0; i < plat_data->size; i++) {
61 ret = rtc_write8(plat_data->rtc, (plat_data->addr + i), val[i]);
62 if (ret < 0)
63 return ret;
64 }
65
66 return 0;
67 }
68
69 #if CONFIG_IS_ENABLED(OF_CONTROL)
reboot_mode_ofdata_to_platdata(struct udevice * dev)70 static int reboot_mode_ofdata_to_platdata(struct udevice *dev)
71 {
72 struct ofnode_phandle_args phandle_args;
73 struct reboot_mode_rtc_platdata *plat_data;
74
75 plat_data = dev_get_plat(dev);
76 if (!plat_data)
77 return -EINVAL;
78
79 if (dev_read_phandle_with_args(dev, "rtc", NULL, 0, 0, &phandle_args)) {
80 dev_err(dev, "RTC device not specified\n");
81 return -ENOENT;
82 }
83
84 if (uclass_get_device_by_ofnode(UCLASS_RTC, phandle_args.node,
85 &plat_data->rtc)) {
86 dev_err(dev, "could not get the RTC device\n");
87 return -ENODEV;
88 }
89
90 plat_data->addr =
91 dev_read_addr_size_index(dev, 0, (fdt_size_t *)&plat_data->size);
92 if (plat_data->addr == FDT_ADDR_T_NONE) {
93 dev_err(dev, "Invalid RTC address\n");
94 return -EINVAL;
95 }
96 if (plat_data->size > sizeof(u32)) {
97 dev_err(dev, "Invalid reg size\n");
98 return -EINVAL;
99 }
100
101 plat_data->is_big_endian = ofnode_read_bool(dev_ofnode(dev), "big-endian");
102
103 return 0;
104 }
105
106 static const struct udevice_id reboot_mode_ids[] = {
107 { .compatible = "reboot-mode-rtc", 0 },
108 {}
109 };
110 #endif
111
112 static const struct reboot_mode_ops reboot_mode_rtc_ops = {
113 .get = reboot_mode_get,
114 .set = reboot_mode_set,
115 };
116
117 U_BOOT_DRIVER(reboot_mode_rtc) = {
118 .name = "reboot-mode-rtc",
119 .id = UCLASS_REBOOT_MODE,
120 #if CONFIG_IS_ENABLED(OF_CONTROL)
121 .of_match = reboot_mode_ids,
122 .of_to_plat = reboot_mode_ofdata_to_platdata,
123 #endif
124 .plat_auto = sizeof(struct reboot_mode_rtc_platdata),
125 .ops = &reboot_mode_rtc_ops,
126 };
127