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 */ 54