include/asm-ppc64/iSeries/vio.h

   1 /* -*- linux-c -*-
   2  *  drivers/char/vio.h
   3  *
   4  *  iSeries Virtual I/O Message Path header
   5  *
   6  *  Authors: Dave Boutcher <boutcher@us.ibm.com>
   7  *           Ryan Arnold <ryanarn@us.ibm.com>
   8  *           Colin Devilbiss <devilbis@us.ibm.com>
   9  *
  10  * (C) Copyright 2000 IBM Corporation
  11  *
  12  * This header file is used by the iSeries virtual I/O device
  13  * drivers.  It defines the interfaces to the common functions
  14  * (implemented in drivers/char/viopath.h) as well as defining
  15  * common functions and structures.  Currently (at the time I
  16  * wrote this comment) the iSeries virtual I/O device drivers
  17  * that use this are
  18  *   drivers/block/viodasd.c
  19  *   drivers/char/viocons.c
  20  *   drivers/char/viotape.c
  21  *   drivers/cdrom/viocd.c
  22  *
  23  * The iSeries virtual ethernet support (veth.c) uses a whole
  24  * different set of functions.
  25  *
  26  * This program is free software;  you can redistribute it and/or
  27  * modify it under the terms of the GNU General Public License as
  28  * published by the Free Software Foundation; either version 2 of the
  29  * License, or (at your option) anyu later version.
  30  *
  31  * This program is distributed in the hope that it will be useful, but
  32  * WITHOUT ANY WARRANTY; without even the implied warranty of
  33  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  34  * General Public License for more details.
  35  *
  36  * You should have received a copy of the GNU General Public License
  37  * along with this program; if not, write to the Free Software Foundation,
  38  * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  39  *
  40  */
  41 #ifndef _ISERIES_VIO_H
  42 #define _ISERIES_VIO_H
  43
  44 #include <asm/iSeries/HvTypes.h>
  45 #include <asm/iSeries/HvLpEvent.h>
  46
  47 /*
  48  * iSeries virtual I/O events use the subtype field in
  49  * HvLpEvent to figure out what kind of vio event is coming
  50  * in.  We use a table to route these, and this defines
  51  * the maximum number of distinct subtypes
  52  */
  53 #define VIO_MAX_SUBTYPES 8
  54
  55 /*
  56  * Each subtype can register a handler to process their events.
  57  * The handler must have this interface.
  58  */
  59 typedef void (vio_event_handler_t) (struct HvLpEvent * event);
  60
  61 extern int viopath_open(HvLpIndex remoteLp, int subtype, int numReq);
  62 extern int viopath_close(HvLpIndex remoteLp, int subtype, int numReq);
  63 extern int vio_setHandler(int subtype, vio_event_handler_t * beh);
  64 extern int vio_clearHandler(int subtype);
  65 extern int viopath_isactive(HvLpIndex lp);
  66 extern HvLpInstanceId viopath_sourceinst(HvLpIndex lp);
  67 extern HvLpInstanceId viopath_targetinst(HvLpIndex lp);
  68 extern void vio_set_hostlp(void);
  69 extern void *vio_get_event_buffer(int subtype);
  70 extern void vio_free_event_buffer(int subtype, void *buffer);
  71
  72 extern HvLpIndex viopath_hostLp;
  73 extern HvLpIndex viopath_ourLp;
  74
  75 #define VIOCHAR_MAX_DATA        200
  76
  77 #define VIOMAJOR_SUBTYPE_MASK   0xff00
  78 #define VIOMINOR_SUBTYPE_MASK   0x00ff
  79 #define VIOMAJOR_SUBTYPE_SHIFT  8
  80
  81 #define VIOVERSION              0x0101
  82
  83 /*
  84  * This is the general structure for VIO errors; each module should have
  85  * a table of them, and each table should be terminated by an entry of
  86  * { 0, 0, NULL }.  Then, to find a specific error message, a module
  87  * should pass its local table and the return code.
  88  */
  89 struct vio_error_entry {
  90         u16 rc;
  91         int errno;
  92         const char *msg;
  93 };
  94 extern const struct vio_error_entry *vio_lookup_rc(
  95                 const struct vio_error_entry *local_table, u16 rc);
  96
  97 enum viosubtypes {
  98         viomajorsubtype_monitor = 0x0100,
  99         viomajorsubtype_blockio = 0x0200,
 100         viomajorsubtype_chario = 0x0300,
 101         viomajorsubtype_config = 0x0400,
 102         viomajorsubtype_cdio = 0x0500,
 103         viomajorsubtype_tape = 0x0600,
 104         viomajorsubtype_scsi = 0x0700
 105 };
 106
 107 enum vioconfigsubtype {
 108         vioconfigget = 0x0001,
 109 };
 110
 111 enum viorc {
 112         viorc_good = 0x0000,
 113         viorc_noConnection = 0x0001,
 114         viorc_noReceiver = 0x0002,
 115         viorc_noBufferAvailable = 0x0003,
 116         viorc_invalidMessageType = 0x0004,
 117         viorc_invalidRange = 0x0201,
 118         viorc_invalidToken = 0x0202,
 119         viorc_DMAError = 0x0203,
 120         viorc_useError = 0x0204,
 121         viorc_releaseError = 0x0205,
 122         viorc_invalidDisk = 0x0206,
 123         viorc_openRejected = 0x0301
 124 };
 125
 126 struct device;
 127
 128 extern struct device *iSeries_vio_dev;
 129
 130 #endif /* _ISERIES_VIO_H */