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+/*******************************************************************************
+*
+* (c) 1998 by Computone Corporation
+*
+********************************************************************************
+*
+*
+* PACKAGE: Linux tty Device Driver for IntelliPort II family of multiport
+* serial I/O controllers.
+*
+* DESCRIPTION: Definitions of the packets used to transfer data and commands
+* Host <--> Board. Information provided here is only applicable
+* when the standard loadware is active.
+*
+*******************************************************************************/
+#ifndef I2PACK_H
+#define I2PACK_H 1
+
+//-----------------------------------------------
+// Revision History:
+//
+// 10 October 1991 MAG First draft
+// 24 February 1992 MAG Additions for 1.4.x loadware
+// 11 March 1992 MAG New status packets
+//
+//-----------------------------------------------
+
+//------------------------------------------------------------------------------
+// Packet Formats:
+//
+// Information passes between the host and board through the FIFO in packets.
+// These have headers which indicate the type of packet. Because the fifo data
+// path may be 16-bits wide, the protocol is constrained such that each packet
+// is always padded to an even byte count. (The lower-level interface routines
+// -- i2ellis.c -- are designed to do this).
+//
+// The sender (be it host or board) must place some number of complete packets
+// in the fifo, then place a message in the mailbox that packets are available.
+// Placing such a message interrupts the "receiver" (be it board or host), who
+// reads the mailbox message and determines that there are incoming packets
+// ready. Since there are no partial packets, and the length of a packet is
+// given in the header, the remainder of the packet can be read without checking
+// for FIFO empty condition. The process is repeated, packet by packet, until
+// the incoming FIFO is empty. Then the receiver uses the outbound mailbox to
+// signal the board that it has read the data. Only then can the sender place
+// additional data in the fifo.
+//------------------------------------------------------------------------------
+//
+//------------------------------------------------
+// Definition of Packet Header Area
+//------------------------------------------------
+//
+// Caution: these only define header areas. In actual use the data runs off
+// beyond the end of these structures.
+//
+// Since these structures are based on sequences of bytes which go to the board,
+// there cannot be ANY padding between the elements.
+#pragma pack(1)
+
+//----------------------------
+// DATA PACKETS
+//----------------------------
+
+typedef struct _i2DataHeader
+{
+ unsigned char i2sChannel; /* The channel number: 0-255 */
+
+ // -- Bitfields are allocated LSB first --
+
+ // For incoming data, indicates whether this is an ordinary packet or a
+ // special one (e.g., hot key hit).
+ unsigned i2sId : 2 __attribute__ ((__packed__));
+
+ // For tagging data packets. There are flush commands which flush only data
+ // packets bearing a particular tag. (used in implementing IntelliView and
+ // IntelliPrint). THE TAG VALUE 0xf is RESERVED and must not be used (it has
+ // meaning internally to the loadware).
+ unsigned i2sTag : 4;
+
+ // These two bits determine the type of packet sent/received.
+ unsigned i2sType : 2;
+
+ // The count of data to follow: does not include the possible additional
+ // padding byte. MAXIMUM COUNT: 4094. The top four bits must be 0.
+ unsigned short i2sCount;
+
+} i2DataHeader, *i2DataHeaderPtr;
+
+// Structure is immediately followed by the data, proper.
+
+//----------------------------
+// NON-DATA PACKETS
+//----------------------------
+
+typedef struct _i2CmdHeader
+{
+ unsigned char i2sChannel; // The channel number: 0-255 (Except where noted
+ // - see below
+
+ // Number of bytes of commands, status or whatever to follow
+ unsigned i2sCount : 6;
+
+ // These two bits determine the type of packet sent/received.
+ unsigned i2sType : 2;
+
+} i2CmdHeader, *i2CmdHeaderPtr;
+
+// Structure is immediately followed by the applicable data.
+
+//---------------------------------------
+// Flow Control Packets (Outbound)
+//---------------------------------------
+
+// One type of outbound command packet is so important that the entire structure
+// is explicitly defined here. That is the flow-control packet. This is never
+// sent by user-level code (as would be the commands to raise/lower DTR, for
+// example). These are only sent by the library routines in response to reading
+// incoming data into the buffers.
+//
+// The parameters inside the command block are maintained in place, then the
+// block is sent at the appropriate time.
+
+typedef struct _flowIn
+{
+ i2CmdHeader hd; // Channel #, count, type (see above)
+ unsigned char fcmd; // The flow control command (37)
+ unsigned short asof; // As of byte number "asof" (LSB first!) I have room
+ // for "room" bytes
+ unsigned short room;
+} flowIn, *flowInPtr;
+
+//----------------------------------------
+// (Incoming) Status Packets
+//----------------------------------------
+
+// Incoming packets which are non-data packets are status packets. In this case,
+// the channel number in the header is unimportant. What follows are one or more
+// sub-packets, the first word of which consists of the channel (first or low
+// byte) and the status indicator (second or high byte), followed by possibly
+// more data.
+
+#define STAT_CTS_UP 0 /* CTS raised (no other bytes) */
+#define STAT_CTS_DN 1 /* CTS dropped (no other bytes) */
+#define STAT_DCD_UP 2 /* DCD raised (no other bytes) */
+#define STAT_DCD_DN 3 /* DCD dropped (no other bytes) */
+#define STAT_DSR_UP 4 /* DSR raised (no other bytes) */
+#define STAT_DSR_DN 5 /* DSR dropped (no other bytes) */
+#define STAT_RI_UP 6 /* RI raised (no other bytes) */
+#define STAT_RI_DN 7 /* RI dropped (no other bytes) */
+#define STAT_BRK_DET 8 /* BRK detect (no other bytes) */
+#define STAT_FLOW 9 /* Flow control(-- more: see below */
+#define STAT_BMARK 10 /* Bookmark (no other bytes)
+ * Bookmark is sent as a response to
+ * a command 60: request for bookmark
+ */
+#define STAT_STATUS 11 /* Special packet: see below */
+#define STAT_TXCNT 12 /* Special packet: see below */
+#define STAT_RXCNT 13 /* Special packet: see below */
+#define STAT_BOXIDS 14 /* Special packet: see below */
+#define STAT_HWFAIL 15 /* Special packet: see below */
+
+#define STAT_MOD_ERROR 0xc0
+#define STAT_MODEM 0xc0/* If status & STAT_MOD_ERROR:
+ * == STAT_MODEM, then this is a modem
+ * status packet, given in response to a
+ * CMD_DSS_NOW command.
+ * The low nibble has each data signal:
+ */
+#define STAT_MOD_DCD 0x8
+#define STAT_MOD_RI 0x4
+#define STAT_MOD_DSR 0x2
+#define STAT_MOD_CTS 0x1
+
+#define STAT_ERROR 0x80/* If status & STAT_MOD_ERROR
+ * == STAT_ERROR, then
+ * sort of error on the channel.
+ * The remaining seven bits indicate
+ * what sort of error it is.
+ */
+/* The low three bits indicate parity, framing, or overrun errors */
+
+#define STAT_E_PARITY 4 /* Parity error */
+#define STAT_E_FRAMING 2 /* Framing error */
+#define STAT_E_OVERRUN 1 /* (uxart) overrun error */
+
+//---------------------------------------
+// STAT_FLOW packets
+//---------------------------------------
+
+typedef struct _flowStat
+{
+ unsigned short asof;
+ unsigned short room;
+}flowStat, *flowStatPtr;
+
+// flowStat packets are received from the board to regulate the flow of outgoing
+// data. A local copy of this structure is also kept to track the amount of
+// credits used and credits remaining. "room" is the amount of space in the
+// board's buffers, "as of" having received a certain byte number. When sending
+// data to the fifo, you must calculate how much buffer space your packet will
+// use. Add this to the current "asof" and subtract it from the current "room".
+//
+// The calculation for the board's buffer is given by CREDIT_USAGE, where size
+// is the un-rounded count of either data characters or command characters.
+// (Which is to say, the count rounded up, plus two).
+
+#define CREDIT_USAGE(size) (((size) + 3) & ~1)
+
+//---------------------------------------
+// STAT_STATUS packets
+//---------------------------------------
+
+typedef struct _debugStat
+{
+ unsigned char d_ccsr;
+ unsigned char d_txinh;
+ unsigned char d_stat1;
+ unsigned char d_stat2;
+} debugStat, *debugStatPtr;
+
+// debugStat packets are sent to the host in response to a CMD_GET_STATUS
+// command. Each byte is bit-mapped as described below:
+
+#define D_CCSR_XON 2 /* Has received XON, ready to transmit */
+#define D_CCSR_XOFF 4 /* Has received XOFF, not transmitting */
+#define D_CCSR_TXENAB 8 /* Transmitter is enabled */
+#define D_CCSR_RXENAB 0x80 /* Receiver is enabled */
+
+#define D_TXINH_BREAK 1 /* We are sending a break */
+#define D_TXINH_EMPTY 2 /* No data to send */
+#define D_TXINH_SUSP 4 /* Output suspended via command 57 */
+#define D_TXINH_CMD 8 /* We are processing an in-line command */
+#define D_TXINH_LCD 0x10 /* LCD diagnostics are running */
+#define D_TXINH_PAUSE 0x20 /* We are processing a PAUSE command */
+#define D_TXINH_DCD 0x40 /* DCD is low, preventing transmission */
+#define D_TXINH_DSR 0x80 /* DSR is low, preventing transmission */
+
+#define D_STAT1_TXEN 1 /* Transmit INTERRUPTS enabled */
+#define D_STAT1_RXEN 2 /* Receiver INTERRUPTS enabled */
+#define D_STAT1_MDEN 4 /* Modem (data set sigs) interrupts enabled */
+#define D_STAT1_RLM 8 /* Remote loopback mode selected */
+#define D_STAT1_LLM 0x10 /* Local internal loopback mode selected */
+#define D_STAT1_CTS 0x20 /* CTS is low, preventing transmission */
+#define D_STAT1_DTR 0x40 /* DTR is low, to stop remote transmission */
+#define D_STAT1_RTS 0x80 /* RTS is low, to stop remote transmission */
+
+#define D_STAT2_TXMT 1 /* Transmit buffers are all empty */
+#define D_STAT2_RXMT 2 /* Receive buffers are all empty */
+#define D_STAT2_RXINH 4 /* Loadware has tried to inhibit remote
+ * transmission: dropped DTR, sent XOFF,
+ * whatever...
+ */
+#define D_STAT2_RXFLO 8 /* Loadware can send no more data to host
+ * until it receives a flow-control packet
+ */
+//-----------------------------------------
+// STAT_TXCNT and STAT_RXCNT packets
+//----------------------------------------
+
+typedef struct _cntStat
+{
+ unsigned short cs_time; // (Assumes host is little-endian!)
+ unsigned short cs_count;
+} cntStat, *cntStatPtr;
+
+// These packets are sent in response to a CMD_GET_RXCNT or a CMD_GET_TXCNT
+// bypass command. cs_time is a running 1 Millisecond counter which acts as a
+// time stamp. cs_count is a running counter of data sent or received from the
+// uxarts. (Not including data added by the chip itself, as with CRLF
+// processing).
+//------------------------------------------
+// STAT_HWFAIL packets
+//------------------------------------------
+
+typedef struct _failStat
+{
+ unsigned char fs_written;
+ unsigned char fs_read;
+ unsigned short fs_address;
+} failStat, *failStatPtr;
+
+// This packet is sent whenever the on-board diagnostic process detects an
+// error. At startup, this process is dormant. The host can wake it up by
+// issuing the bypass command CMD_HW_TEST. The process runs at low priority and
+// performs continuous hardware verification; writing data to certain on-board
+// registers, reading it back, and comparing. If it detects an error, this
+// packet is sent to the host, and the process goes dormant again until the host
+// sends another CMD_HW_TEST. It then continues with the next register to be
+// tested.
+
+//------------------------------------------------------------------------------
+// Macros to deal with the headers more easily! Note that these are defined so
+// they may be used as "left" as well as "right" expressions.
+//------------------------------------------------------------------------------
+
+// Given a pointer to the packet, reference the channel number
+//
+#define CHANNEL_OF(pP) ((i2DataHeaderPtr)(pP))->i2sChannel
+
+// Given a pointer to the packet, reference the Packet type
+//
+#define PTYPE_OF(pP) ((i2DataHeaderPtr)(pP))->i2sType
+
+// The possible types of packets
+//
+#define PTYPE_DATA 0 /* Host <--> Board */
+#define PTYPE_BYPASS 1 /* Host ---> Board */
+#define PTYPE_INLINE 2 /* Host ---> Board */
+#define PTYPE_STATUS 2 /* Host <--- Board */
+
+// Given a pointer to a Data packet, reference the Tag
+//
+#define TAG_OF(pP) ((i2DataHeaderPtr)(pP))->i2sTag
+
+// Given a pointer to a Data packet, reference the data i.d.
+//
+#define ID_OF(pP) ((i2DataHeaderPtr)(pP))->i2sId
+
+// The possible types of ID's
+//
+#define ID_ORDINARY_DATA 0
+#define ID_HOT_KEY 1
+
+// Given a pointer to a Data packet, reference the count
+//
+#define DATA_COUNT_OF(pP) ((i2DataHeaderPtr)(pP))->i2sCount
+
+// Given a pointer to a Data packet, reference the beginning of data
+//
+#define DATA_OF(pP) &((unsigned char *)(pP))[4] // 4 = size of header
+
+// Given a pointer to a Non-Data packet, reference the count
+//
+#define CMD_COUNT_OF(pP) ((i2CmdHeaderPtr)(pP))->i2sCount
+
+#define MAX_CMD_PACK_SIZE 62 // Maximum size of such a count
+
+// Given a pointer to a Non-Data packet, reference the beginning of data
+//
+#define CMD_OF(pP) &((unsigned char *)(pP))[2] // 2 = size of header
+
+//--------------------------------
+// MailBox Bits:
+//--------------------------------
+
+//--------------------------
+// Outgoing (host to board)
+//--------------------------
+//
+#define MB_OUT_STUFFED 0x80 // Host has placed output in fifo
+#define MB_IN_STRIPPED 0x40 // Host has read in all input from fifo
+
+//--------------------------
+// Incoming (board to host)
+//--------------------------
+//
+#define MB_IN_STUFFED 0x80 // Board has placed input in fifo
+#define MB_OUT_STRIPPED 0x40 // Board has read all output from fifo
+#define MB_FATAL_ERROR 0x20 // Board has encountered a fatal error
+
+#pragma pack(4) // Reset padding to command-line default
+
+#endif // I2PACK_H
+