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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)
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.
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_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