1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * Siemens SIMATIC IPC drivers
4 *
5 * Copyright (c) Siemens AG, 2018-2021
6 *
7 * Authors:
8 * Henning Schild <henning.schild@siemens.com>
9 * Gerd Haeussler <gerd.haeussler.ext@siemens.com>
10 */
11
12 #ifndef __PLATFORM_DATA_X86_SIMATIC_IPC_H
13 #define __PLATFORM_DATA_X86_SIMATIC_IPC_H
14
15 #include <linux/dmi.h>
16 #include <linux/platform_data/x86/simatic-ipc-base.h>
17
18 #define SIMATIC_IPC_DMI_ENTRY_OEM 129
19 /* binary type */
20 #define SIMATIC_IPC_DMI_TYPE 0xff
21 #define SIMATIC_IPC_DMI_GROUP 0x05
22 #define SIMATIC_IPC_DMI_ENTRY 0x02
23 #define SIMATIC_IPC_DMI_TID 0x02
24
25 enum simatic_ipc_station_ids {
26 SIMATIC_IPC_INVALID_STATION_ID = 0,
27 SIMATIC_IPC_IPC227D = 0x00000501,
28 SIMATIC_IPC_IPC427D = 0x00000701,
29 SIMATIC_IPC_IPC227E = 0x00000901,
30 SIMATIC_IPC_IPC277E = 0x00000902,
31 SIMATIC_IPC_IPC427E = 0x00000A01,
32 SIMATIC_IPC_IPC477E = 0x00000A02,
33 SIMATIC_IPC_IPC127E = 0x00000D01,
34 SIMATIC_IPC_IPC227G = 0x00000F01,
35 SIMATIC_IPC_IPC427G = 0x00001001,
36 };
37
simatic_ipc_get_station_id(u8 * data,int max_len)38 static inline u32 simatic_ipc_get_station_id(u8 *data, int max_len)
39 {
40 struct {
41 u8 type; /* type (0xff = binary) */
42 u8 len; /* len of data entry */
43 u8 group;
44 u8 entry;
45 u8 tid;
46 __le32 station_id; /* station id (LE) */
47 } __packed * data_entry = (void *)data + sizeof(struct dmi_header);
48
49 while ((u8 *)data_entry < data + max_len) {
50 if (data_entry->type == SIMATIC_IPC_DMI_TYPE &&
51 data_entry->len == sizeof(*data_entry) &&
52 data_entry->group == SIMATIC_IPC_DMI_GROUP &&
53 data_entry->entry == SIMATIC_IPC_DMI_ENTRY &&
54 data_entry->tid == SIMATIC_IPC_DMI_TID) {
55 return le32_to_cpu(data_entry->station_id);
56 }
57 data_entry = (void *)((u8 *)(data_entry) + data_entry->len);
58 }
59
60 return SIMATIC_IPC_INVALID_STATION_ID;
61 }
62
63 static inline void
simatic_ipc_find_dmi_entry_helper(const struct dmi_header * dh,void * _data)64 simatic_ipc_find_dmi_entry_helper(const struct dmi_header *dh, void *_data)
65 {
66 u32 *id = _data;
67
68 if (dh->type != SIMATIC_IPC_DMI_ENTRY_OEM)
69 return;
70
71 *id = simatic_ipc_get_station_id((u8 *)dh, dh->length);
72 }
73
74 #endif /* __PLATFORM_DATA_X86_SIMATIC_IPC_H */
75
