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/* SPDX-License-Identifier: GPL-2.0+ */
* ipmi_si_sm.h
* State machine interface for low-level IPMI system management
* interface state machines. This code is the interface between
* the ipmi_smi code (that handles the policy of a KCS, SMIC, or
* BT interface) and the actual low-level state machine.
* Author: MontaVista Software, Inc.
* Corey Minyard <>
* Copyright 2002 MontaVista Software Inc.
#include <linux/ipmi.h>
* This is defined by the state machines themselves, it is an opaque
* data type for them to use.
struct si_sm_data;
enum si_type {
* The structure for doing I/O in the state machine. The state
* machine doesn't have the actual I/O routines, they are done through
* this interface.
struct si_sm_io {
unsigned char (*inputb)(const struct si_sm_io *io, unsigned int offset);
void (*outputb)(const struct si_sm_io *io,
unsigned int offset,
unsigned char b);
* Generic info used by the actual handling routines, the
* state machine shouldn't touch these.
void __iomem *addr;
int regspacing;
int regsize;
int regshift;
int addr_type;
long addr_data;
enum ipmi_addr_src addr_source; /* ACPI, PCI, SMBIOS, hardcode, etc. */
void (*addr_source_cleanup)(struct si_sm_io *io);
void *addr_source_data;
union ipmi_smi_info_union addr_info;
int (*io_setup)(struct si_sm_io *info);
void (*io_cleanup)(struct si_sm_io *info);
unsigned int io_size;
int irq;
int (*irq_setup)(struct si_sm_io *io);
void *irq_handler_data;
void (*irq_cleanup)(struct si_sm_io *io);
u8 slave_addr;
enum si_type si_type;
struct device *dev;
/* Results of SMI events. */
enum si_sm_result {
SI_SM_CALL_WITHOUT_DELAY, /* Call the driver again immediately */
SI_SM_CALL_WITH_DELAY, /* Delay some before calling again. */
SI_SM_CALL_WITH_TICK_DELAY,/* Delay >=1 tick before calling again. */
SI_SM_TRANSACTION_COMPLETE, /* A transaction is finished. */
SI_SM_IDLE, /* The SM is in idle state. */
SI_SM_HOSED, /* The hardware violated the state machine. */
* The hardware is asserting attn and the state machine is
* idle.
/* Handlers for the SMI state machine. */
struct si_sm_handlers {
* Put the version number of the state machine here so the
* upper layer can print it.
char *version;
* Initialize the data and return the amount of I/O space to
* reserve for the space.
unsigned int (*init_data)(struct si_sm_data *smi,
struct si_sm_io *io);
* Start a new transaction in the state machine. This will
* return -2 if the state machine is not idle, -1 if the size
* is invalid (to large or too small), or 0 if the transaction
* is successfully completed.
int (*start_transaction)(struct si_sm_data *smi,
unsigned char *data, unsigned int size);
* Return the results after the transaction. This will return
* -1 if the buffer is too small, zero if no transaction is
* present, or the actual length of the result data.
int (*get_result)(struct si_sm_data *smi,
unsigned char *data, unsigned int length);
* Call this periodically (for a polled interface) or upon
* receiving an interrupt (for a interrupt-driven interface).
* If interrupt driven, you should probably poll this
* periodically when not in idle state. This should be called
* with the time that passed since the last call, if it is
* significant. Time is in microseconds.
enum si_sm_result (*event)(struct si_sm_data *smi, long time);
* Attempt to detect an SMI. Returns 0 on success or nonzero
* on failure.
int (*detect)(struct si_sm_data *smi);
/* The interface is shutting down, so clean it up. */
void (*cleanup)(struct si_sm_data *smi);
/* Return the size of the SMI structure in bytes. */
int (*size)(void);
/* Current state machines that we can use. */
extern const struct si_sm_handlers kcs_smi_handlers;
extern const struct si_sm_handlers smic_smi_handlers;
extern const struct si_sm_handlers bt_smi_handlers;