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, 2018-2023
   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
  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_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
  43 static 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
  68 static inline void
  69 simatic_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 */