include/asm-powerpc/iseries/vio.h

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