1 /* SPDX-License-Identifier: BSD-3-Clause */
2 /*
3 	usa67msg.h
4 
5 	Copyright (c) 1998-2007 InnoSys Incorporated.  All Rights Reserved
6 	This file is available under a BSD-style copyright
7 
8 	Keyspan USB Async Firmware to run on Anchor FX1
9 
10 	Redistribution and use in source and binary forms, with or without
11 	modification, are permitted provided that the following conditions are
12 	met:
13 
14 	1. Redistributions of source code must retain this licence text
15    	without modification, this list of conditions, and the following
16    	disclaimer.  The following copyright notice must appear immediately at
17    	the beginning of all source files:
18 
19         	Copyright (c) 1998-2007 InnoSys Incorporated.  All Rights Reserved
20 
21         	This file is available under a BSD-style copyright
22 
23 	2. Redistributions in binary form must reproduce the above copyright
24    	notice, this list of conditions and the following disclaimer in the
25    	documentation and/or other materials provided with the distribution.
26 
27 	3. The name of InnoSys Incorprated may not be used to endorse or promote
28    	products derived from this software without specific prior written
29    	permission.
30 
31 	THIS SOFTWARE IS PROVIDED BY INNOSYS CORP. ``AS IS'' AND ANY EXPRESS OR
32 	IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
33 	OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
34 	NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
35 	INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
36 	(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
37 	SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
38 	CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
39 	LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
40 	OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
41 	SUCH DAMAGE.
42 
43 	Fourth revision: This message format supports the USA28XG
44 
45 	Buffer formats for RX/TX data messages are not defined by
46 	a structure, but are described here:
47 
48 	USB OUT (host -> USAxx, transmit) messages contain a
49 	REQUEST_ACK indicator (set to 0xff to request an ACK at the
50 	completion of transmit; 0x00 otherwise), followed by data:
51 
52 		RQSTACK DAT DAT DAT ...
53 
54 	with a total data length of up to 63.
55 
56 	USB IN (USAxx -> host, receive) messages begin with a status
57 	byte in which the 0x80 bit is either:
58 
59 		(a)	0x80 bit clear
60 			indicates that the bytes following it are all data
61 			bytes:
62 
63 				STAT DATA DATA DATA DATA DATA ...
64 
65 			for a total of up to 63 DATA bytes,
66 
67 	or:
68 
69 		(b)	0x80 bit set
70 			indiates that the bytes following alternate data and
71 			status bytes:
72 
73 				STAT DATA STAT DATA STAT DATA STAT DATA ...
74 
75 			for a total of up to 32 DATA bytes.
76 
77 	The valid bits in the STAT bytes are:
78 
79 		OVERRUN	0x02
80 		PARITY	0x04
81 		FRAMING	0x08
82 		BREAK	0x10
83 
84 	Notes:
85 
86 	(1) The OVERRUN bit can appear in either (a) or (b) format
87 		messages, but the but the PARITY/FRAMING/BREAK bits
88 		only appear in (b) format messages.
89 	(2) For the host to determine the exact point at which the
90 		overrun occurred (to identify the point in the data
91 		stream at which the data was lost), it needs to count
92 		128 characters, starting at the first character of the
93 		message in which OVERRUN was reported; the lost character(s)
94 		would have been received between the 128th and 129th
95 		characters.
96 	(3)	An RX data message in which the first byte has 0x80 clear
97 		serves as a "break off" indicator.
98 
99 	revision history:
100 
101 	1999feb10	add reportHskiaChanges to allow us to ignore them
102 	1999feb10	add txAckThreshold for fast+loose throughput enhancement
103 	1999mar30	beef up support for RX error reporting
104 	1999apr14	add resetDataToggle to control message
105 	2000jan04	merge with usa17msg.h
106 	2000jun01	add extended BSD-style copyright text
107 	2001jul05	change message format to improve OVERRUN case
108 	2002jun05	update copyright date, improve comments
109 	2006feb06	modify for FX1 chip
110 
111 */
112 
113 #ifndef	__USA67MSG__
114 #define	__USA67MSG__
115 
116 
117 // all things called "ControlMessage" are sent on the 'control' endpoint
118 
119 typedef struct keyspan_usa67_portControlMessage
120 {
121 	u8	port;		// 0 or 1 (selects port)
122 	/*
123 		there are three types of "commands" sent in the control message:
124 
125 		1.	configuration changes which must be requested by setting
126 			the corresponding "set" flag (and should only be requested
127 			when necessary, to reduce overhead on the device):
128 	*/
129 	u8	setClocking,	// host requests baud rate be set
130 		baudLo,			// host does baud divisor calculation
131 		baudHi,			// baudHi is only used for first port (gives lower rates)
132 		externalClock_txClocking,
133 						// 0=internal, other=external
134 
135 		setLcr,			// host requests lcr be set
136 		lcr,			// use PARITY, STOPBITS, DATABITS below
137 
138 		setFlowControl,	// host requests flow control be set
139 		ctsFlowControl,	// 1=use CTS flow control, 0=don't
140 		xonFlowControl,	// 1=use XON/XOFF flow control, 0=don't
141 		xonChar,		// specified in current character format
142 		xoffChar,		// specified in current character format
143 
144 		setTxTriState_setRts,
145 						// host requests TX tri-state be set
146 		txTriState_rts,	// 1=active (normal), 0=tristate (off)
147 
148 		setHskoa_setDtr,
149 						// host requests HSKOA output be set
150 		hskoa_dtr,		// 1=on, 0=off
151 
152 		setPrescaler,	// host requests prescalar be set (default: 13)
153 		prescaler;		// specified as N/8; values 8-ff are valid
154 						// must be set any time internal baud rate is set;
155 						// must not be set when external clocking is used
156 
157 	/*
158 		3.	configuration data which is simply used as is (no overhead,
159 			but must be specified correctly in every host message).
160 	*/
161 	u8	forwardingLength,  // forward when this number of chars available
162 		reportHskiaChanges_dsrFlowControl,
163 						// 1=normal; 0=ignore external clock
164 						// 1=use DSR flow control, 0=don't
165 		txAckThreshold,	// 0=not allowed, 1=normal, 2-255 deliver ACK faster
166 		loopbackMode;	// 0=no loopback, 1=loopback enabled
167 
168 	/*
169 		4.	commands which are flags only; these are processed in order
170 			(so that, e.g., if both _txOn and _txOff flags are set, the
171 			port ends in a TX_OFF state); any non-zero value is respected
172 	*/
173 	u8	_txOn,			// enable transmitting (and continue if there's data)
174 		_txOff,			// stop transmitting
175 		txFlush,		// toss outbound data
176 		txBreak,		// turn on break (cleared by _txOn)
177 		rxOn,			// turn on receiver
178 		rxOff,			// turn off receiver
179 		rxFlush,		// toss inbound data
180 		rxForward,		// forward all inbound data, NOW (as if fwdLen==1)
181 		returnStatus,	// return current status (even if it hasn't changed)
182 		resetDataToggle;// reset data toggle state to DATA0
183 
184 } keyspan_usa67_portControlMessage;
185 
186 // defines for bits in lcr
187 #define	USA_DATABITS_5		0x00
188 #define	USA_DATABITS_6		0x01
189 #define	USA_DATABITS_7		0x02
190 #define	USA_DATABITS_8		0x03
191 #define	STOPBITS_5678_1		0x00	// 1 stop bit for all byte sizes
192 #define	STOPBITS_5_1p5		0x04	// 1.5 stop bits for 5-bit byte
193 #define	STOPBITS_678_2		0x04	// 2 stop bits for 6/7/8-bit byte
194 #define	USA_PARITY_NONE		0x00
195 #define	USA_PARITY_ODD		0x08
196 #define	USA_PARITY_EVEN		0x18
197 #define	PARITY_1			0x28
198 #define	PARITY_0			0x38
199 
200 // all things called "StatusMessage" are sent on the status endpoint
201 
202 typedef struct keyspan_usa67_portStatusMessage	// one for each port
203 {
204 	u8	port,			// 0=first, 1=second, other=see below
205 		hskia_cts,		// reports HSKIA pin
206 		gpia_dcd,		// reports GPIA pin
207 		_txOff,			// port has been disabled (by host)
208 		_txXoff,		// port is in XOFF state (either host or RX XOFF)
209 		txAck,			// indicates a TX message acknowledgement
210 		rxEnabled,		// as configured by rxOn/rxOff 1=on, 0=off
211 		controlResponse;// 1=a control message has been processed
212 } keyspan_usa67_portStatusMessage;
213 
214 // bits in RX data message when STAT byte is included
215 #define	RXERROR_OVERRUN	0x02
216 #define	RXERROR_PARITY	0x04
217 #define	RXERROR_FRAMING	0x08
218 #define	RXERROR_BREAK	0x10
219 
220 typedef struct keyspan_usa67_globalControlMessage
221 {
222 	u8	port,	 			// 3
223 		sendGlobalStatus,	// 2=request for two status responses
224 		resetStatusToggle,	// 1=reset global status toggle
225 		resetStatusCount;	// a cycling value
226 } keyspan_usa67_globalControlMessage;
227 
228 typedef struct keyspan_usa67_globalStatusMessage
229 {
230 	u8	port,				// 3
231 		sendGlobalStatus,	// from request, decremented
232 		resetStatusCount;	// as in request
233 } keyspan_usa67_globalStatusMessage;
234 
235 typedef struct keyspan_usa67_globalDebugMessage
236 {
237 	u8	port,				// 2
238 		a,
239 		b,
240 		c,
241 		d;
242 } keyspan_usa67_globalDebugMessage;
243 
244 // ie: the maximum length of an FX1 endpoint buffer
245 #define	MAX_DATA_LEN			64
246 
247 // update status approx. 60 times a second (16.6666 ms)
248 #define	STATUS_UPDATE_INTERVAL	16
249 
250 // status rationing tuning value (each port gets checked each n ms)
251 #define	STATUS_RATION	10
252 
253 #endif
254 
255 
256