drivers/char/ipmi/ipmi_si_sm.h

   1 /*
   2  * ipmi_si_sm.h
   3  *
   4  * State machine interface for low-level IPMI system management
   5  * interface state machines.  This code is the interface between
   6  * the ipmi_smi code (that handles the policy of a KCS, SMIC, or
   7  * BT interface) and the actual low-level state machine.
   8  *
   9  * Author: MontaVista Software, Inc.
  10  *         Corey Minyard <minyard@mvista.com>
  11  *         source@mvista.com
  12  *
  13  * Copyright 2002 MontaVista Software Inc.
  14  *
  15  *  This program is free software; you can redistribute it and/or modify it
  16  *  under the terms of the GNU General Public License as published by the
  17  *  Free Software Foundation; either version 2 of the License, or (at your
  18  *  option) any later version.
  19  *
  20  *
  21  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  22  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  23  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  24  *  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  25  *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  26  *  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
  27  *  OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  28  *  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
  29  *  TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
  30  *  USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  31  *
  32  *  You should have received a copy of the GNU General Public License along
  33  *  with this program; if not, write to the Free Software Foundation, Inc.,
  34  *  675 Mass Ave, Cambridge, MA 02139, USA.
  35  */
  36
  37 /*
  38  * This is defined by the state machines themselves, it is an opaque
  39  * data type for them to use.
  40  */
  41 struct si_sm_data;
  42
  43 /*
  44  * The structure for doing I/O in the state machine.  The state
  45  * machine doesn't have the actual I/O routines, they are done through
  46  * this interface.
  47  */
  48 struct si_sm_io {
  49         unsigned char (*inputb)(const struct si_sm_io *io, unsigned int offset);
  50         void (*outputb)(const struct si_sm_io *io,
  51                         unsigned int  offset,
  52                         unsigned char b);
  53
  54         /*
  55          * Generic info used by the actual handling routines, the
  56          * state machine shouldn't touch these.
  57          */
  58         void __iomem *addr;
  59         int  regspacing;
  60         int  regsize;
  61         int  regshift;
  62         int addr_type;
  63         long addr_data;
  64 };
  65
  66 /* Results of SMI events. */
  67 enum si_sm_result {
  68         SI_SM_CALL_WITHOUT_DELAY, /* Call the driver again immediately */
  69         SI_SM_CALL_WITH_DELAY,  /* Delay some before calling again. */
  70         SI_SM_CALL_WITH_TICK_DELAY,/* Delay >=1 tick before calling again. */
  71         SI_SM_TRANSACTION_COMPLETE, /* A transaction is finished. */
  72         SI_SM_IDLE,             /* The SM is in idle state. */
  73         SI_SM_HOSED,            /* The hardware violated the state machine. */
  74
  75         /*
  76          * The hardware is asserting attn and the state machine is
  77          * idle.
  78          */
  79         SI_SM_ATTN
  80 };
  81
  82 /* Handlers for the SMI state machine. */
  83 struct si_sm_handlers {
  84         /*
  85          * Put the version number of the state machine here so the
  86          * upper layer can print it.
  87          */
  88         char *version;
  89
  90         /*
  91          * Initialize the data and return the amount of I/O space to
  92          * reserve for the space.
  93          */
  94         unsigned int (*init_data)(struct si_sm_data *smi,
  95                                   struct si_sm_io   *io);
  96
  97         /*
  98          * Start a new transaction in the state machine.  This will
  99          * return -2 if the state machine is not idle, -1 if the size
 100          * is invalid (to large or too small), or 0 if the transaction
 101          * is successfully completed.
 102          */
 103         int (*start_transaction)(struct si_sm_data *smi,
 104                                  unsigned char *data, unsigned int size);
 105
 106         /*
 107          * Return the results after the transaction.  This will return
 108          * -1 if the buffer is too small, zero if no transaction is
 109          * present, or the actual length of the result data.
 110          */
 111         int (*get_result)(struct si_sm_data *smi,
 112                           unsigned char *data, unsigned int length);
 113
 114         /*
 115          * Call this periodically (for a polled interface) or upon
 116          * receiving an interrupt (for a interrupt-driven interface).
 117          * If interrupt driven, you should probably poll this
 118          * periodically when not in idle state.  This should be called
 119          * with the time that passed since the last call, if it is
 120          * significant.  Time is in microseconds.
 121          */
 122         enum si_sm_result (*event)(struct si_sm_data *smi, long time);
 123
 124         /*
 125          * Attempt to detect an SMI.  Returns 0 on success or nonzero
 126          * on failure.
 127          */
 128         int (*detect)(struct si_sm_data *smi);
 129
 130         /* The interface is shutting down, so clean it up. */
 131         void (*cleanup)(struct si_sm_data *smi);
 132
 133         /* Return the size of the SMI structure in bytes. */
 134         int (*size)(void);
 135 };
 136
 137 /* Current state machines that we can use. */
 138 extern const struct si_sm_handlers kcs_smi_handlers;
 139 extern const struct si_sm_handlers smic_smi_handlers;
 140 extern const struct si_sm_handlers bt_smi_handlers;
 141