drivers/staging/ath6kl/include/common/htc.h

   1 //------------------------------------------------------------------------------
   2 // <copyright file="htc.h" company="Atheros">
   3 //    Copyright (c) 2004-2010 Atheros Corporation.  All rights reserved.
   4 //
   5 //
   6 // Permission to use, copy, modify, and/or distribute this software for any
   7 // purpose with or without fee is hereby granted, provided that the above
   8 // copyright notice and this permission notice appear in all copies.
   9 //
  10 // THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  11 // WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  12 // MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  13 // ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  14 // WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  15 // ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  16 // OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  17 //
  18 //
  19 //------------------------------------------------------------------------------
  20 //==============================================================================
  21 // Author(s): ="Atheros"
  22 //==============================================================================
  23
  24 #ifndef __HTC_H__
  25 #define __HTC_H__
  26
  27 #ifndef ATH_TARGET
  28 #include "athstartpack.h"
  29 #endif
  30
  31 #define A_OFFSETOF(type,field) (unsigned long)(&(((type *)NULL)->field))
  32
  33 #define ASSEMBLE_UNALIGNED_UINT16(p,highbyte,lowbyte) \
  34         (((u16)(((u8 *)(p))[(highbyte)])) << 8 | (u16)(((u8 *)(p))[(lowbyte)]))
  35
  36 /* alignment independent macros (little-endian) to fetch UINT16s or UINT8s from a
  37  * structure using only the type and field name.
  38  * Use these macros if there is the potential for unaligned buffer accesses. */
  39 #define A_GET_UINT16_FIELD(p,type,field) \
  40     ASSEMBLE_UNALIGNED_UINT16(p,\
  41                               A_OFFSETOF(type,field) + 1, \
  42                               A_OFFSETOF(type,field))
  43
  44 #define A_SET_UINT16_FIELD(p,type,field,value) \
  45 {                                              \
  46     ((u8 *)(p))[A_OFFSETOF(type,field)] = (u8)(value);        \
  47     ((u8 *)(p))[A_OFFSETOF(type,field) + 1] = (u8)((value) >> 8); \
  48 }
  49
  50 #define A_GET_UINT8_FIELD(p,type,field) \
  51             ((u8 *)(p))[A_OFFSETOF(type,field)]
  52
  53 #define A_SET_UINT8_FIELD(p,type,field,value) \
  54     ((u8 *)(p))[A_OFFSETOF(type,field)] = (value)
  55
  56 /****** DANGER DANGER ***************
  57  *
  58  *   The frame header length and message formats defined herein were
  59  *   selected to accommodate optimal alignment for target processing.  This reduces code
  60  *   size and improves performance.
  61  *
  62  *   Any changes to the header length may alter the alignment and cause exceptions
  63  *   on the target. When adding to the message structures insure that fields are
  64  *   properly aligned.
  65  *
  66  */
  67
  68 /* HTC frame header */
  69 typedef PREPACK struct _HTC_FRAME_HDR{
  70         /* do not remove or re-arrange these fields, these are minimally required
  71          * to take advantage of 4-byte lookaheads in some hardware implementations */
  72     u8 EndpointID;
  73     u8 Flags;
  74     u16 PayloadLen;       /* length of data (including trailer) that follows the header */
  75
  76     /***** end of 4-byte lookahead ****/
  77
  78     u8 ControlBytes[2];
  79
  80     /* message payload starts after the header */
  81
  82 } POSTPACK HTC_FRAME_HDR;
  83
  84 /* frame header flags */
  85
  86     /* send direction */
  87 #define HTC_FLAGS_NEED_CREDIT_UPDATE (1 << 0)
  88 #define HTC_FLAGS_SEND_BUNDLE        (1 << 1)  /* start or part of bundle */
  89     /* receive direction */
  90 #define HTC_FLAGS_RECV_UNUSED_0      (1 << 0)  /* bit 0 unused */
  91 #define HTC_FLAGS_RECV_TRAILER       (1 << 1)  /* bit 1 trailer data present */
  92 #define HTC_FLAGS_RECV_UNUSED_2      (1 << 0)  /* bit 2 unused */
  93 #define HTC_FLAGS_RECV_UNUSED_3      (1 << 0)  /* bit 3 unused */
  94 #define HTC_FLAGS_RECV_BUNDLE_CNT_MASK (0xF0)  /* bits 7..4  */
  95 #define HTC_FLAGS_RECV_BUNDLE_CNT_SHIFT 4
  96
  97 #define HTC_HDR_LENGTH  (sizeof(HTC_FRAME_HDR))
  98 #define HTC_MAX_TRAILER_LENGTH   255
  99 #define HTC_MAX_PAYLOAD_LENGTH   (4096 - sizeof(HTC_FRAME_HDR))
 100
 101 /* HTC control message IDs */
 102
 103 #define HTC_MSG_READY_ID                    1
 104 #define HTC_MSG_CONNECT_SERVICE_ID          2
 105 #define HTC_MSG_CONNECT_SERVICE_RESPONSE_ID 3
 106 #define HTC_MSG_SETUP_COMPLETE_ID           4
 107 #define HTC_MSG_SETUP_COMPLETE_EX_ID        5
 108
 109 #define HTC_MAX_CONTROL_MESSAGE_LENGTH  256
 110
 111 /* base message ID header */
 112 typedef PREPACK struct {
 113     u16 MessageID;
 114 } POSTPACK HTC_UNKNOWN_MSG;
 115
 116 /* HTC ready message
 117  * direction : target-to-host  */
 118 typedef PREPACK struct {
 119     u16 MessageID;    /* ID */
 120     u16 CreditCount;  /* number of credits the target can offer */
 121     u16 CreditSize;   /* size of each credit */
 122     u8 MaxEndpoints; /* maximum number of endpoints the target has resources for */
 123     u8 _Pad1;
 124 } POSTPACK HTC_READY_MSG;
 125
 126     /* extended HTC ready message */
 127 typedef PREPACK struct {
 128     HTC_READY_MSG   Version2_0_Info;   /* legacy version 2.0 information at the front... */
 129     /* extended information */
 130     u8 HTCVersion;
 131     u8 MaxMsgsPerHTCBundle;
 132 } POSTPACK HTC_READY_EX_MSG;
 133
 134 #define HTC_VERSION_2P0  0x00
 135 #define HTC_VERSION_2P1  0x01  /* HTC 2.1 */
 136
 137 #define HTC_SERVICE_META_DATA_MAX_LENGTH 128
 138
 139 /* connect service
 140  * direction : host-to-target */
 141 typedef PREPACK struct {
 142     u16 MessageID;
 143     u16 ServiceID;           /* service ID of the service to connect to */
 144     u16 ConnectionFlags;     /* connection flags */
 145
 146 #define HTC_CONNECT_FLAGS_REDUCE_CREDIT_DRIBBLE (1 << 2)  /* reduce credit dribbling when
 147                                                              the host needs credits */
 148 #define HTC_CONNECT_FLAGS_THRESHOLD_LEVEL_MASK             (0x3)
 149 #define HTC_CONNECT_FLAGS_THRESHOLD_LEVEL_ONE_FOURTH        0x0
 150 #define HTC_CONNECT_FLAGS_THRESHOLD_LEVEL_ONE_HALF          0x1
 151 #define HTC_CONNECT_FLAGS_THRESHOLD_LEVEL_THREE_FOURTHS     0x2
 152 #define HTC_CONNECT_FLAGS_THRESHOLD_LEVEL_UNITY             0x3
 153
 154     u8 ServiceMetaLength;   /* length of meta data that follows */
 155     u8 _Pad1;
 156
 157     /* service-specific meta data starts after the header */
 158
 159 } POSTPACK HTC_CONNECT_SERVICE_MSG;
 160
 161 /* connect response
 162  * direction : target-to-host */
 163 typedef PREPACK struct {
 164     u16 MessageID;
 165     u16 ServiceID;            /* service ID that the connection request was made */
 166     u8 Status;               /* service connection status */
 167     u8 EndpointID;           /* assigned endpoint ID */
 168     u16 MaxMsgSize;           /* maximum expected message size on this endpoint */
 169     u8 ServiceMetaLength;    /* length of meta data that follows */
 170     u8 _Pad1;
 171
 172     /* service-specific meta data starts after the header */
 173
 174 } POSTPACK HTC_CONNECT_SERVICE_RESPONSE_MSG;
 175
 176 typedef PREPACK struct {
 177     u16 MessageID;
 178     /* currently, no other fields */
 179 } POSTPACK HTC_SETUP_COMPLETE_MSG;
 180
 181     /* extended setup completion message */
 182 typedef PREPACK struct {
 183     u16 MessageID;
 184     u32 SetupFlags;
 185     u8 MaxMsgsPerBundledRecv;
 186     u8 Rsvd[3];
 187 } POSTPACK HTC_SETUP_COMPLETE_EX_MSG;
 188
 189 #define HTC_SETUP_COMPLETE_FLAGS_ENABLE_BUNDLE_RECV     (1 << 0)
 190
 191 /* connect response status codes */
 192 #define HTC_SERVICE_SUCCESS      0  /* success */
 193 #define HTC_SERVICE_NOT_FOUND    1  /* service could not be found */
 194 #define HTC_SERVICE_FAILED       2  /* specific service failed the connect */
 195 #define HTC_SERVICE_NO_RESOURCES 3  /* no resources (i.e. no more endpoints) */
 196 #define HTC_SERVICE_NO_MORE_EP   4  /* specific service is not allowing any more
 197                                        endpoints */
 198
 199 /* report record IDs */
 200
 201 #define HTC_RECORD_NULL             0
 202 #define HTC_RECORD_CREDITS          1
 203 #define HTC_RECORD_LOOKAHEAD        2
 204 #define HTC_RECORD_LOOKAHEAD_BUNDLE 3
 205
 206 typedef PREPACK struct {
 207     u8 RecordID;     /* Record ID */
 208     u8 Length;       /* Length of record */
 209 } POSTPACK HTC_RECORD_HDR;
 210
 211 typedef PREPACK struct {
 212     u8 EndpointID;     /* Endpoint that owns these credits */
 213     u8 Credits;        /* credits to report since last report */
 214 } POSTPACK HTC_CREDIT_REPORT;
 215
 216 typedef PREPACK struct {
 217     u8 PreValid;         /* pre valid guard */
 218     u8 LookAhead[4];     /* 4 byte lookahead */
 219     u8 PostValid;        /* post valid guard */
 220
 221    /* NOTE: the LookAhead array is guarded by a PreValid and Post Valid guard bytes.
 222     * The PreValid bytes must equal the inverse of the PostValid byte */
 223
 224 } POSTPACK HTC_LOOKAHEAD_REPORT;
 225
 226 typedef PREPACK struct {
 227     u8 LookAhead[4];     /* 4 byte lookahead */
 228 } POSTPACK HTC_BUNDLED_LOOKAHEAD_REPORT;
 229
 230 #ifndef ATH_TARGET
 231 #include "athendpack.h"
 232 #endif
 233
 234
 235 #endif /* __HTC_H__ */
 236