1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (c), Vaisala Oyj
4 */
5
6 #include <common.h>
7 #include <dm.h>
8 #include <dm/device_compat.h>
9 #include <reboot-mode/reboot-mode-rtc.h>
10 #include <reboot-mode/reboot-mode.h>
11 #include <rtc.h>
12
13 DECLARE_GLOBAL_DATA_PTR;
14
reboot_mode_get(struct udevice * dev,u32 * buf)15 static int reboot_mode_get(struct udevice *dev, u32 *buf)
16 {
17 if (!buf)
18 return -EINVAL;
19
20 int ret;
21 u8 *val = (u8 *)buf;
22 struct reboot_mode_rtc_platdata *plat_data;
23
24 plat_data = dev_get_plat(dev);
25 if (!plat_data)
26 return -EINVAL;
27
28 for (int i = 0; i < plat_data->size; i++) {
29 ret = rtc_read8(plat_data->rtc, plat_data->addr + i);
30 if (ret < 0)
31 return ret;
32
33 val[i] = ret;
34 }
35
36 if (plat_data->is_big_endian)
37 *buf = __be32_to_cpu(*buf);
38 else
39 *buf = __le32_to_cpu(*buf);
40
41 return 0;
42 }
43
reboot_mode_set(struct udevice * dev,u32 buf)44 static int reboot_mode_set(struct udevice *dev, u32 buf)
45 {
46 int ret;
47 u8 *val;
48 struct reboot_mode_rtc_platdata *plat_data;
49
50 plat_data = dev_get_plat(dev);
51 if (!plat_data)
52 return -EINVAL;
53
54 if (plat_data->is_big_endian)
55 buf = __cpu_to_be32(buf);
56 else
57 buf = __cpu_to_le32(buf);
58
59 val = (u8 *)&buf;
60
61 for (int i = 0; i < plat_data->size; i++) {
62 ret = rtc_write8(plat_data->rtc, (plat_data->addr + i), val[i]);
63 if (ret < 0)
64 return ret;
65 }
66
67 return 0;
68 }
69
70 #if CONFIG_IS_ENABLED(OF_CONTROL)
reboot_mode_ofdata_to_platdata(struct udevice * dev)71 static int reboot_mode_ofdata_to_platdata(struct udevice *dev)
72 {
73 struct ofnode_phandle_args phandle_args;
74 struct reboot_mode_rtc_platdata *plat_data;
75
76 plat_data = dev_get_plat(dev);
77 if (!plat_data)
78 return -EINVAL;
79
80 if (dev_read_phandle_with_args(dev, "rtc", NULL, 0, 0, &phandle_args)) {
81 dev_err(dev, "RTC device not specified\n");
82 return -ENOENT;
83 }
84
85 if (uclass_get_device_by_ofnode(UCLASS_RTC, phandle_args.node,
86 &plat_data->rtc)) {
87 dev_err(dev, "could not get the RTC device\n");
88 return -ENODEV;
89 }
90
91 plat_data->addr =
92 dev_read_addr_size_index(dev, 0, (fdt_size_t *)&plat_data->size);
93 if (plat_data->addr == FDT_ADDR_T_NONE) {
94 dev_err(dev, "Invalid RTC address\n");
95 return -EINVAL;
96 }
97 if (plat_data->size > sizeof(u32)) {
98 dev_err(dev, "Invalid reg size\n");
99 return -EINVAL;
100 }
101
102 plat_data->is_big_endian = ofnode_read_bool(dev_ofnode(dev), "big-endian");
103
104 return 0;
105 }
106
107 static const struct udevice_id reboot_mode_ids[] = {
108 { .compatible = "reboot-mode-rtc", 0 },
109 {}
110 };
111 #endif
112
113 static const struct reboot_mode_ops reboot_mode_rtc_ops = {
114 .get = reboot_mode_get,
115 .set = reboot_mode_set,
116 };
117
118 U_BOOT_DRIVER(reboot_mode_rtc) = {
119 .name = "reboot-mode-rtc",
120 .id = UCLASS_REBOOT_MODE,
121 #if CONFIG_IS_ENABLED(OF_CONTROL)
122 .of_match = reboot_mode_ids,
123 .of_to_plat = reboot_mode_ofdata_to_platdata,
124 #endif
125 .plat_auto = sizeof(struct reboot_mode_rtc_platdata),
126 .ops = &reboot_mode_rtc_ops,
127 };
128