arch/powerpc/include/asm/pmi.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 #ifndef _POWERPC_PMI_H
   3 #define _POWERPC_PMI_H
   4
   5 /*
   6  * Definitions for talking with PMI device on PowerPC
   7  *
   8  * PMI (Platform Management Interrupt) is a way to communicate
   9  * with the BMC (Baseboard Management Controller) via interrupts.
  10  * Unlike IPMI it is bidirectional and has a low latency.
  11  *
  12  * (C) Copyright IBM Deutschland Entwicklung GmbH 2005
  13  *
  14  * Author: Christian Krafft <krafft@de.ibm.com>
  15  */
  16
  17 #ifdef __KERNEL__
  18
  19 #define PMI_TYPE_FREQ_CHANGE    0x01
  20 #define PMI_TYPE_POWER_BUTTON   0x02
  21 #define PMI_READ_TYPE           0
  22 #define PMI_READ_DATA0          1
  23 #define PMI_READ_DATA1          2
  24 #define PMI_READ_DATA2          3
  25 #define PMI_WRITE_TYPE          4
  26 #define PMI_WRITE_DATA0         5
  27 #define PMI_WRITE_DATA1         6
  28 #define PMI_WRITE_DATA2         7
  29
  30 #define PMI_ACK                 0x80
  31
  32 #define PMI_TIMEOUT             100
  33
  34 typedef struct {
  35         u8      type;
  36         u8      data0;
  37         u8      data1;
  38         u8      data2;
  39 } pmi_message_t;
  40
  41 struct pmi_handler {
  42         struct list_head node;
  43         u8 type;
  44         void (*handle_pmi_message) (pmi_message_t);
  45 };
  46
  47 int pmi_register_handler(struct pmi_handler *);
  48 void pmi_unregister_handler(struct pmi_handler *);
  49
  50 int pmi_send_message(pmi_message_t);
  51
  52 #endif /* __KERNEL__ */
  53 #endif /* _POWERPC_PMI_H */