drivers/usb/serial/keyspan_usa26msg.h

   1 /*
   2         usa26msg.h
   3
   4         Copyright (C) 1998-2000 InnoSys Incorporated.  All Rights Reserved
   5         This file is available under a BSD-style copyright
   6
   7         Keyspan USB Async Message Formats for the USA28X
   8
   9         Redistribution and use in source and binary forms, with or without
  10         modification, are permitted provided that the following conditions are
  11         met:
  12
  13         1. Redistributions of source code must retain this licence text
  14         without modification, this list of conditions, and the following
  15         disclaimer.  The following copyright notice must appear immediately at
  16         the beginning of all source files:
  17
  18                 Copyright (C) 1998-2000 InnoSys Incorporated.  All Rights Reserved
  19
  20                 This file is available under a BSD-style copyright
  21
  22         2. The name of InnoSys Incorporated may not be used to endorse or promote
  23         products derived from this software without specific prior written
  24         permission.
  25
  26         THIS SOFTWARE IS PROVIDED BY INNOSYS CORP. ``AS IS'' AND ANY EXPRESS OR
  27         IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  28         OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
  29         NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
  30         INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  31         (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  32         SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  33         CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34         LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35         OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36         SUCH DAMAGE.
  37
  38         Third revision: USA28X version (aka USA26)
  39
  40         Buffer formats for RX/TX data messages are not defined by
  41         a structure, but are described here:
  42
  43         USB OUT (host -> USAxx, transmit) messages contain a
  44         REQUEST_ACK indicator (set to 0xff to request an ACK at the
  45         completion of transmit; 0x00 otherwise), followed by data:
  46
  47                 RQSTACK DAT DAT DAT ...
  48
  49         with a total data length of 63.
  50
  51         USB IN (USAxx -> host, receive) messages begin with a status
  52         byte in which the 0x80 bit is either:
  53
  54                 (a)     0x80 bit clear
  55                         indicates that the bytes following it are all data
  56                         bytes:
  57
  58                                 STAT DATA DATA DATA DATA DATA ...
  59
  60                         for a total of up to 63 DATA bytes,
  61
  62         or:
  63
  64                 (b)     0x80 bit set
  65                         indicates that the bytes following alternate data and
  66                         status bytes:
  67
  68                                 STAT DATA STAT DATA STAT DATA STAT DATA ...
  69
  70                         for a total of up to 32 DATA bytes.
  71
  72         The valid bits in the STAT bytes are:
  73
  74                 OVERRUN 0x02
  75                 PARITY  0x04
  76                 FRAMING 0x08
  77                 BREAK   0x10
  78
  79         Notes:
  80
  81         (1) The OVERRUN bit can appear in either (a) or (b) format
  82                 messages, but the but the PARITY/FRAMING/BREAK bits
  83                 only appear in (b) format messages.
  84         (2) For the host to determine the exact point at which the
  85                 overrun occurred (to identify the point in the data
  86                 stream at which the data was lost), it needs to count
  87                 128 characters, starting at the first character of the
  88                 message in which OVERRUN was reported; the lost character(s)
  89                 would have been received between the 128th and 129th
  90                 characters.
  91         (3)     An RX data message in which the first byte has 0x80 clear
  92                 serves as a "break off" indicator.
  93
  94         revision history:
  95
  96         1999feb10       add reportHskiaChanges to allow us to ignore them
  97         1999feb10       add txAckThreshold for fast+loose throughput enhancement
  98         1999mar30       beef up support for RX error reporting
  99         1999apr14       add resetDataToggle to control message
 100         2000jan04       merge with usa17msg.h
 101         2000jun01       add extended BSD-style copyright text
 102         2001jul05       change message format to improve OVERRUN case
 103
 104         Note on shared names:
 105
 106         In the case of fields which have been merged between the USA17
 107         and USA26 definitions, the USA26 definition is the first part
 108         of the name and the USA17 definition is the second part of the
 109         name; both meanings are described below.
 110 */
 111
 112 #ifndef __USA26MSG__
 113 #define __USA26MSG__
 114
 115
 116 struct keyspan_usa26_portControlMessage
 117 {
 118         /*
 119                 there are three types of "commands" sent in the control message:
 120
 121                 1.      configuration changes which must be requested by setting
 122                         the corresponding "set" flag (and should only be requested
 123                         when necessary, to reduce overhead on the USA26):
 124         */
 125         u8      setClocking,    // BOTH: host requests baud rate be set
 126                 baudLo,         // BOTH: host does baud divisor calculation
 127                 baudHi,         // BOTH: baudHi is only used for first port (gives lower rates)
 128                 externalClock_txClocking,
 129                                         // USA26: 0=internal, other=external
 130                                         // USA17: 0=internal, other=external/RI
 131                 rxClocking,             // USA17: 0=internal, 1=external/RI, other=external/DSR
 132
 133
 134                 setLcr,                 // BOTH: host requests lcr be set
 135                 lcr,                    // BOTH: use PARITY, STOPBITS, DATABITS below
 136
 137                 setFlowControl,         // BOTH: host requests flow control be set
 138                 ctsFlowControl,         // BOTH: 1=use CTS flow control, 0=don't
 139                 xonFlowControl,         // BOTH: 1=use XON/XOFF flow control, 0=don't
 140                 xonChar,                // BOTH: specified in current character format
 141                 xoffChar,               // BOTH: specified in current character format
 142
 143                 setTxTriState_setRts,
 144                                         // USA26: host requests TX tri-state be set
 145                                         // USA17: host requests RTS output be set
 146                 txTriState_rts,         // BOTH: 1=active (normal), 0=tristate (off)
 147
 148                 setHskoa_setDtr,
 149                                         // USA26: host requests HSKOA output be set
 150                                         // USA17: host requests DTR output be set
 151                 hskoa_dtr,              // BOTH: 1=on, 0=off
 152
 153                 setPrescaler,           // USA26: host requests prescalar be set (default: 13)
 154                 prescaler;              // BOTH: specified as N/8; values 8-ff are valid
 155                                         // must be set any time internal baud rate is set;
 156                                         // must not be set when external clocking is used
 157                                         // note: in USA17, prescaler is applied whenever
 158                                         // setClocking is requested
 159
 160         /*
 161                 3.      configuration data which is simply used as is (no overhead,
 162                         but must be specified correctly in every host message).
 163         */
 164         u8      forwardingLength,  // BOTH: forward when this number of chars available
 165                 reportHskiaChanges_dsrFlowControl,
 166                                                 // USA26: 1=normal; 0=ignore external clock
 167                                                 // USA17: 1=use DSR flow control, 0=don't
 168                 txAckThreshold, // BOTH: 0=not allowed, 1=normal, 2-255 deliver ACK faster
 169                 loopbackMode;   // BOTH: 0=no loopback, 1=loopback enabled
 170
 171         /*
 172                 4.      commands which are flags only; these are processed in order
 173                         (so that, e.g., if both _txOn and _txOff flags are set, the
 174                         port ends in a TX_OFF state); any non-zero value is respected
 175         */
 176         u8      _txOn,                  // BOTH: enable transmitting (and continue if there's data)
 177                 _txOff,                 // BOTH: stop transmitting
 178                 txFlush,                // BOTH: toss outbound data
 179                 txBreak,                // BOTH: turn on break (cleared by _txOn)
 180                 rxOn,                   // BOTH: turn on receiver
 181                 rxOff,                  // BOTH: turn off receiver
 182                 rxFlush,                // BOTH: toss inbound data
 183                 rxForward,              // BOTH: forward all inbound data, NOW (as if fwdLen==1)
 184                 returnStatus,   // BOTH: return current status (even if it hasn't changed)
 185                 resetDataToggle;// BOTH: reset data toggle state to DATA0
 186
 187 };
 188
 189 // defines for bits in lcr
 190 #define USA_DATABITS_5          0x00
 191 #define USA_DATABITS_6          0x01
 192 #define USA_DATABITS_7          0x02
 193 #define USA_DATABITS_8          0x03
 194 #define STOPBITS_5678_1 0x00    // 1 stop bit for all byte sizes
 195 #define STOPBITS_5_1p5  0x04    // 1.5 stop bits for 5-bit byte
 196 #define STOPBITS_678_2  0x04    // 2 stop bits for 6/7/8-bit byte
 197 #define USA_PARITY_NONE         0x00
 198 #define USA_PARITY_ODD          0x08
 199 #define USA_PARITY_EVEN         0x18
 200 #define PARITY_1                0x28
 201 #define PARITY_0                0x38
 202
 203 // all things called "StatusMessage" are sent on the status endpoint
 204
 205 struct keyspan_usa26_portStatusMessage  // one for each port
 206 {
 207         u8      port,                   // BOTH: 0=first, 1=second, other=see below
 208                 hskia_cts,              // USA26: reports HSKIA pin
 209                                                 // USA17: reports CTS pin
 210                 gpia_dcd,               // USA26: reports GPIA pin
 211                                                 // USA17: reports DCD pin
 212                 dsr,                    // USA17: reports DSR pin
 213                 ri,                             // USA17: reports RI pin
 214                 _txOff,                 // port has been disabled (by host)
 215                 _txXoff,                // port is in XOFF state (either host or RX XOFF)
 216                 rxEnabled,              // as configured by rxOn/rxOff 1=on, 0=off
 217                 controlResponse;// 1=a control message has been processed
 218 };
 219
 220 // bits in RX data message when STAT byte is included
 221 #define RXERROR_OVERRUN 0x02
 222 #define RXERROR_PARITY  0x04
 223 #define RXERROR_FRAMING 0x08
 224 #define RXERROR_BREAK   0x10
 225
 226 struct keyspan_usa26_globalControlMessage
 227 {
 228         u8      sendGlobalStatus,       // 2=request for two status responses
 229                 resetStatusToggle,      // 1=reset global status toggle
 230                 resetStatusCount;       // a cycling value
 231 };
 232
 233 struct keyspan_usa26_globalStatusMessage
 234 {
 235         u8      port,                           // 3
 236                 sendGlobalStatus,       // from request, decremented
 237                 resetStatusCount;       // as in request
 238 };
 239
 240 struct keyspan_usa26_globalDebugMessage
 241 {
 242         u8      port,                           // 2
 243                 a,
 244                 b,
 245                 c,
 246                 d;
 247 };
 248
 249 // ie: the maximum length of an EZUSB endpoint buffer
 250 #define MAX_DATA_LEN                    64
 251
 252 // update status approx. 60 times a second (16.6666 ms)
 253 #define STATUS_UPDATE_INTERVAL  16
 254
 255 // status rationing tuning value (each port gets checked each n ms)
 256 #define STATUS_RATION   10
 257
 258 #endif
 259
 260