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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
25enum 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};
35
36static inline u32 simatic_ipc_get_station_id(u8 *data, int max_len)
37{
38 struct {
39 u8 type; /* type (0xff = binary) */
40 u8 len; /* len of data entry */
41 u8 group;
42 u8 entry;
43 u8 tid;
44 __le32 station_id; /* station id (LE) */
45 } __packed * data_entry = (void *)data + sizeof(struct dmi_header);
46
47 while ((u8 *)data_entry < data + max_len) {
48 if (data_entry->type == SIMATIC_IPC_DMI_TYPE &&
49 data_entry->len == sizeof(*data_entry) &&
50 data_entry->group == SIMATIC_IPC_DMI_GROUP &&
51 data_entry->entry == SIMATIC_IPC_DMI_ENTRY &&
52 data_entry->tid == SIMATIC_IPC_DMI_TID) {
53 return le32_to_cpu(data_entry->station_id);
54 }
55 data_entry = (void *)((u8 *)(data_entry) + data_entry->len);
56 }
57
58 return SIMATIC_IPC_INVALID_STATION_ID;
59}
60
61static inline void
62simatic_ipc_find_dmi_entry_helper(const struct dmi_header *dh, void *_data)
63{
64 u32 *id = _data;
65
66 if (dh->type != SIMATIC_IPC_DMI_ENTRY_OEM)
67 return;
68
69 *id = simatic_ipc_get_station_id((u8 *)dh, dh->length);
70}
71
72#endif /* __PLATFORM_DATA_X86_SIMATIC_IPC_H */