include/linux/platform_data/x86/simatic-ipc.h

   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_IPCBX_39A = 0x00001001,
  36         SIMATIC_IPC_IPCPX_39A = 0x00001002,
  37 };
  38
  39 static inline u32 simatic_ipc_get_station_id(u8 *data, int max_len)
  40 {
  41         struct {
  42                 u8      type;           /* type (0xff = binary) */
  43                 u8      len;            /* len of data entry */
  44                 u8      group;
  45                 u8      entry;
  46                 u8      tid;
  47                 __le32  station_id;     /* station id (LE) */
  48         } __packed * data_entry = (void *)data + sizeof(struct dmi_header);
  49
  50         while ((u8 *)data_entry < data + max_len) {
  51                 if (data_entry->type == SIMATIC_IPC_DMI_TYPE &&
  52                     data_entry->len == sizeof(*data_entry) &&
  53                     data_entry->group == SIMATIC_IPC_DMI_GROUP &&
  54                     data_entry->entry == SIMATIC_IPC_DMI_ENTRY &&
  55                     data_entry->tid == SIMATIC_IPC_DMI_TID) {
  56                         return le32_to_cpu(data_entry->station_id);
  57                 }
  58                 data_entry = (void *)((u8 *)(data_entry) + data_entry->len);
  59         }
  60
  61         return SIMATIC_IPC_INVALID_STATION_ID;
  62 }
  63
  64 static inline void
  65 simatic_ipc_find_dmi_entry_helper(const struct dmi_header *dh, void *_data)
  66 {
  67         u32 *id = _data;
  68
  69         if (dh->type != SIMATIC_IPC_DMI_ENTRY_OEM)
  70                 return;
  71
  72         *id = simatic_ipc_get_station_id((u8 *)dh, dh->length);
  73 }
  74
  75 #endif /* __PLATFORM_DATA_X86_SIMATIC_IPC_H */