1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Siemens SIMATIC IPC drivers
4 *
5 * Copyright (c) Siemens AG, 2018-2023
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	SIMATIC_IPC_IPC227G = 0x00000F01,
35	SIMATIC_IPC_IPC277G = 0x00000F02,
36	SIMATIC_IPC_IPCBX_39A = 0x00001001,
37	SIMATIC_IPC_IPCPX_39A = 0x00001002,
38	SIMATIC_IPC_IPCBX_21A = 0x00001101,
39	SIMATIC_IPC_IPCBX_56A = 0x00001201,
40	SIMATIC_IPC_IPCBX_59A = 0x00001202,
41};
42
43static inline u32 simatic_ipc_get_station_id(u8 *data, int max_len)
44{
45	struct {
46		u8	type;		/* type (0xff = binary) */
47		u8	len;		/* len of data entry */
48		u8	group;
49		u8	entry;
50		u8	tid;
51		__le32	station_id;	/* station id (LE) */
52	} __packed * data_entry = (void *)data + sizeof(struct dmi_header);
53
54	while ((u8 *)data_entry < data + max_len) {
55		if (data_entry->type == SIMATIC_IPC_DMI_TYPE &&
56		    data_entry->len == sizeof(*data_entry) &&
57		    data_entry->group == SIMATIC_IPC_DMI_GROUP &&
58		    data_entry->entry == SIMATIC_IPC_DMI_ENTRY &&
59		    data_entry->tid == SIMATIC_IPC_DMI_TID) {
60			return le32_to_cpu(data_entry->station_id);
61		}
62		data_entry = (void *)((u8 *)(data_entry) + data_entry->len);
63	}
64
65	return SIMATIC_IPC_INVALID_STATION_ID;
66}
67
68static inline void
69simatic_ipc_find_dmi_entry_helper(const struct dmi_header *dh, void *_data)
70{
71	u32 *id = _data;
72
73	if (dh->type != SIMATIC_IPC_DMI_ENTRY_OEM)
74		return;
75
76	*id = simatic_ipc_get_station_id((u8 *)dh, dh->length);
77}
78
79#endif /* __PLATFORM_DATA_X86_SIMATIC_IPC_H */
80