/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
34typedef struct {
35	u8	type;
36	u8	data0;
37	u8	data1;
38	u8	data2;
39} pmi_message_t;
40
41struct pmi_handler {
42	struct list_head node;
43	u8 type;
44	void (*handle_pmi_message) (pmi_message_t);
45};
46
47int pmi_register_handler(struct pmi_handler *);
48void pmi_unregister_handler(struct pmi_handler *);
49
50int pmi_send_message(pmi_message_t);
51
52#endif /* __KERNEL__ */
53#endif /* _POWERPC_PMI_H */