/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Siemens SIMATIC IPC drivers
 *
 * Copyright (c) Siemens AG, 2018-2023
 *
 * Authors:
 *  Henning Schild <henning.schild@siemens.com>
 *  Gerd Haeussler <gerd.haeussler.ext@siemens.com>
 */

#ifndef __PLATFORM_DATA_X86_SIMATIC_IPC_H
#define __PLATFORM_DATA_X86_SIMATIC_IPC_H

#include <linux/dmi.h>
#include <linux/platform_data/x86/simatic-ipc-base.h>

#define SIMATIC_IPC_DMI_ENTRY_OEM       129
/* binary type */
#define SIMATIC_IPC_DMI_TYPE            0xff
#define SIMATIC_IPC_DMI_GROUP           0x05
#define SIMATIC_IPC_DMI_ENTRY           0x02
#define SIMATIC_IPC_DMI_TID             0x02

enum simatic_ipc_station_ids {
        SIMATIC_IPC_INVALID_STATION_ID = 0,
        SIMATIC_IPC_IPC227D = 0x00000501,
        SIMATIC_IPC_IPC427D = 0x00000701,
        SIMATIC_IPC_IPC227E = 0x00000901,
        SIMATIC_IPC_IPC277E = 0x00000902,
        SIMATIC_IPC_IPC427E = 0x00000A01,
        SIMATIC_IPC_IPC477E = 0x00000A02,
        SIMATIC_IPC_IPC127E = 0x00000D01,
        SIMATIC_IPC_IPC227G = 0x00000F01,
        SIMATIC_IPC_IPC277G = 0x00000F02,
        SIMATIC_IPC_IPCBX_39A = 0x00001001,
        SIMATIC_IPC_IPCPX_39A = 0x00001002,
        SIMATIC_IPC_IPCBX_21A = 0x00001101,
        SIMATIC_IPC_IPCBX_56A = 0x00001201,
        SIMATIC_IPC_IPCBX_59A = 0x00001202,
};

static inline u32 simatic_ipc_get_station_id(u8 *data, int max_len)
{
        struct {
                u8      type;           /* type (0xff = binary) */
                u8      len;            /* len of data entry */
                u8      group;
                u8      entry;
                u8      tid;
                __le32  station_id;     /* station id (LE) */
        } __packed * data_entry = (void *)data + sizeof(struct dmi_header);

        while ((u8 *)data_entry < data + max_len) {
                if (data_entry->type == SIMATIC_IPC_DMI_TYPE &&
                    data_entry->len == sizeof(*data_entry) &&
                    data_entry->group == SIMATIC_IPC_DMI_GROUP &&
                    data_entry->entry == SIMATIC_IPC_DMI_ENTRY &&
                    data_entry->tid == SIMATIC_IPC_DMI_TID) {
                        return le32_to_cpu(data_entry->station_id);
                }
                data_entry = (void *)((u8 *)(data_entry) + data_entry->len);
        }

        return SIMATIC_IPC_INVALID_STATION_ID;
}

static inline void
simatic_ipc_find_dmi_entry_helper(const struct dmi_header *dh, void *_data)
{
        u32 *id = _data;

        if (dh->type != SIMATIC_IPC_DMI_ENTRY_OEM)
                return;

        *id = simatic_ipc_get_station_id((u8 *)dh, dh->length);
}

#endif /* __PLATFORM_DATA_X86_SIMATIC_IPC_H */