/*******************************************************************************
*
* (c) 1998 by Computone Corporation
*
********************************************************************************
*
*
* PACKAGE: Linux tty Device Driver for IntelliPort II family of multiport
* serial I/O controllers.
*
* DESCRIPTION: Header file for high level library functions
*
*******************************************************************************/
#ifndef I2LIB_H
#define I2LIB_H 1
//------------------------------------------------------------------------------
// I2LIB.H
//
// IntelliPort-II and IntelliPort-IIEX
//
// Defines, structure definitions, and external declarations for i2lib.c
//------------------------------------------------------------------------------
//--------------------------------------
// Mandatory Includes:
//--------------------------------------
#include "ip2types.h"
#include "i2ellis.h"
#include "i2pack.h"
#include "i2cmd.h"
#include <linux/workqueue.h>
//------------------------------------------------------------------------------
// i2ChanStr -- Channel Structure:
// Used to track per-channel information for the library routines using standard
// loadware. Note also, a pointer to an array of these structures is patched
// into the i2eBordStr (see i2ellis.h)
//------------------------------------------------------------------------------
//
// If we make some limits on the maximum block sizes, we can avoid dealing with
// buffer wrap. The wrapping of the buffer is based on where the start of the
// packet is. Then there is always room for the packet contiguously.
//
// Maximum total length of an outgoing data or in-line command block. The limit
// of 36 on data is quite arbitrary and based more on DOS memory limitations
// than the board interface. However, for commands, the maximum packet length is
// MAX_CMD_PACK_SIZE, because the field size for the count is only a few bits
// (see I2PACK.H) in such packets. For data packets, the count field size is not
// the limiting factor. As of this writing, MAX_OBUF_BLOCK < MAX_CMD_PACK_SIZE,
// but be careful if wanting to modify either.
//
#define MAX_OBUF_BLOCK 36
// Another note on maximum block sizes: we are buffering packets here. Data is
// put into the buffer (if there is room) regardless of the credits from the
// board. The board sends new credits whenever it has removed from his buffers a
// number of characters equal to 80% of total buffer size. (Of course, the total
// buffer size is what is reported when the very first set of flow control
// status packets are received from the board. Therefore, to be robust, you must
// always fill the board to at least 80% of the current credit limit, else you
// might not give it enough to trigger a new report. These conditions are
// obtained here so long as the maximum output block size is less than 20% the
// size of the board's output buffers. This is true at present by "coincidence"
// or "infernal knowledge": the board's output buffers are at least 700 bytes
// long (20% = 140 bytes, at least). The 80% figure is "official", so the safest
// strategy might be to trap the first flow control report and guarantee that
// the effective maxObufBlock is the minimum of MAX_OBUF_BLOCK and 20% of first
// reported buffer credit.
//
#define MAX_CBUF_BLOCK 6 // Maximum total length of a bypass command block
#define IBUF_SIZE 512 // character capacity of input buffer per channel
#define OBUF_SIZE 1024// character capacity of output buffer per channel
#define CBUF_SIZE 10 // character capacity of output bypass buffer
typedef struct _i2ChanStr
{
// First, back-pointers so that given a pointer to this structure, you can
// determine the correct board and channel number to reference, (say, when
// issuing commands, etc. (Note, channel number is in infl.hd.i2sChannel.)
int port_index; // Index of port in channel structure array attached
// to board structure.
PTTY pTTY; // Pointer to tty structure for port (OS specific)
USHORT validity; // Indicates whether the given channel has been
// initialized, really exists (or is a missing
// channel, e.g. channel 9 on an 8-port box.)
i2eBordStrPtr pMyBord; // Back-pointer to this channel's board structure
int wopen; // waiting fer carrier
int throttled; // Set if upper layer can take no data
int flags; // Defined in tty.h
PWAITQ open_wait; // Pointer for OS sleep function.
PWAITQ close_wait; // Pointer for OS sleep function.
PWAITQ delta_msr_wait;// Pointer for OS sleep function.
PWAITQ dss_now_wait; // Pointer for OS sleep function.
struct timer_list BookmarkTimer; // Used by i2DrainOutput
wait_queue_head_t pBookmarkWait; // Used by i2DrainOutput
int BaudBase;
int BaudDivisor;
USHORT ClosingDelay;
USHORT ClosingWaitTime;
volatile
flowIn infl; // This structure is initialized as a completely
// formed flow-control command packet, and as such
// has the channel number, also the capacity and
// "as-of" data needed continuously.
USHORT sinceLastFlow; // Counts the number of characters read from input
// buffers, since the last time flow control info
// was sent.
USHORT whenSendFlow; // Determines when new flow control is to be sent to
// the board. Note unlike earlier manifestations of
// the driver, these packets can be sent from
// in-place.
USHORT channelNeeds; // Bit map of important things which must be done
// for this channel. (See bits below )
volatile
flowStat outfl; // Same type of structure is used to hold current
// flow control information used to control our
// output. "asof" is kept updated as data is sent,
// and "room" never goes to zero.
// The incoming ring buffer
// Unlike the outgoing buffers, this holds raw data, not packets. The two
// extra bytes are used to hold the byte-padding when there is room for an
// odd number of bytes before we must wrap.
//
UCHAR Ibuf[IBUF_SIZE + 2];
volatile
USHORT Ibuf_stuff; // Stuffing index
volatile
USHORT Ibuf_strip; // Stripping index
// The outgoing ring-buffer: Holds Data and command packets. N.B., even
// though these are in the channel structure, the channel is also written
// here, the easier to send it to the fifo when ready. HOWEVER, individual
// packets here are NOT padded to even length: the routines for writing
// blocks to the fifo will pad to even byte counts.
//
UCHAR Obuf[OBUF_SIZE+MAX_OBUF_BLOCK+4];
volatile
USHORT Obuf_stuff; // Stuffing index
volatile
USHORT Obuf_strip; // Stripping index
int Obuf_char_count;
// The outgoing bypass-command buffer. Unlike earlier manifestations, the
// flow control packets are sent directly from the structures. As above, the
// channel number is included in the packet, but they are NOT padded to even
// size.
//
UCHAR Cbuf[CBUF_SIZE+MAX_CBUF_BLOCK+2];
volatile
USHORT Cbuf_stuff; // Stuffing index
volatile
USHORT Cbuf_strip; // Stripping index
// The temporary buffer for the Linux tty driver PutChar entry.
//
UCHAR Pbuf[MAX_OBUF_BLOCK - sizeof (i2DataHeader)];
volatile
USHORT Pbuf_stuff; // Stuffing index
// The state of incoming data-set signals
//
USHORT dataSetIn; // Bit-mapped according to below. Also indicates
// whether a break has been detected since last
// inquiry.
// The state of outcoming data-set signals (as far as we can tell!)
//
USHORT dataSetOut; // Bit-mapped according to below.
// Most recent hot-key identifier detected
//
USHORT hotKeyIn; // Hot key as sent by the board, HOT_CLEAR indicates
// no hot key detected since last examined.
// Counter of outstanding requests for bookmarks
//
short bookMarks; // Number of outstanding bookmark requests, (+ive
// whenever a bookmark request if queued up, -ive
// whenever a bookmark is received).
// Misc options
//
USHORT channelOptions; // See below
// To store various incoming special packets
//
debugStat channelStatus;
cntStat channelRcount;
cntStat channelTcount;
failStat channelFail;
// To store the last values for line characteristics we sent to the board.
//
int speed;
int flush_flags;
void (*trace)(unsigned short,unsigned char,unsigned char,unsigned long,...);
/*
* Kernel counters for the 4 input interrupts
*/
struct async_icount icount;
/*
* Task queues for processing input packets from the board.
*/
struct work_struct tqueue_input;
struct work_struct tqueue_status;
struct work_struct tqueue_hangup;
rwlock_t Ibuf_spinlock;
rwlock_t Obuf_spinlock;
rwlock_t Cbuf_spinlock;
rwlock_t Pbuf_spinlock;
} i2ChanStr, *i2ChanStrPtr;
//---------------------------------------------------
// Manifests and bit-maps for elements in i2ChanStr
//---------------------------------------------------
//
// flush flags
//
#define STARTFL_FLAG 1
#define STOPFL_FLAG 2
// validity
//
#define CHANNEL_MAGIC_BITS 0xff00
#define CHANNEL_MAGIC 0x5300 // (validity & CHANNEL_MAGIC_BITS) ==
// CHANNEL_MAGIC --> structure good
#define CHANNEL_SUPPORT 0x0001 // Indicates channel is supported, exists,
// and passed P.O.S.T.
// channelNeeds
//
#define NEED_FLOW 1 // Indicates flow control has been queued
#define NEED_INLINE 2 // Indicates inline commands or data queued
#define NEED_BYPASS 4 // Indicates bypass commands queued
#define NEED_CREDIT 8 // Indicates would be sending except has not sufficient
// credit. The data is still in the channel structure,
// but the channel is not enqueued in the board
// structure again until there is a credit received from
// the board.
// dataSetIn (Also the bits for i2GetStatus return value)
//
#define I2_DCD 1
#define I2_CTS 2
#define I2_DSR 4
#define I2_RI 8
// dataSetOut (Also the bits for i2GetStatus return value)
//
#define I2_DTR 1
#define I2_RTS 2
// i2GetStatus() can optionally clear these bits
//
#define I2_BRK 0x10 // A break was detected
#define I2_PAR 0x20 // A parity error was received
#define I2_FRA 0x40 // A framing error was received
#define I2_OVR 0x80 // An overrun error was received
// i2GetStatus() automatically clears these bits */
//
#define I2_DDCD 0x100 // DCD changed from its former value
#define I2_DCTS 0x200 // CTS changed from its former value
#define I2_DDSR 0x400 // DSR changed from its former value
#define I2_DRI 0x800 // RI changed from its former value
// hotKeyIn
//
#define HOT_CLEAR 0x1322 // Indicates that no hot-key has been detected
// channelOptions
//
#define CO_NBLOCK_WRITE 1 // Writes don't block waiting for buffer. (Default
// is, they do wait.)
// fcmodes
//
#define I2_OUTFLOW_CTS 0x0001
#define I2_INFLOW_RTS 0x0002
#define I2_INFLOW_DSR 0x0004
#define I2_INFLOW_DTR 0x0008
#define I2_OUTFLOW_DSR 0x0010
#define I2_OUTFLOW_DTR 0x0020
#define I2_OUTFLOW_XON 0x0040
#define I2_OUTFLOW_XANY 0x0080
#define I2_INFLOW_XON 0x0100
#define I2_CRTSCTS (I2_OUTFLOW_CTS|I2_INFLOW_RTS)
#define I2_IXANY_MODE (I2_OUTFLOW_XON|I2_OUTFLOW_XANY)
//-------------------------------------------
// Macros used from user level like functions
//-------------------------------------------
// Macros to set and clear channel options
//
#define i2SetOption(pCh, option) pCh->channelOptions |= option
#define i2ClrOption(pCh, option) pCh->channelOptions &= ~option
// Macro to set fatal-error trap
//
#define i2SetFatalTrap(pB, routine) pB->i2eFatalTrap = routine
//--------------------------------------------
// Declarations and prototypes for i2lib.c
//--------------------------------------------
//
static int i2InitChannels(i2eBordStrPtr, int, i2ChanStrPtr);
static int i2QueueCommands(int, i2ChanStrPtr, int, int, cmdSyntaxPtr,...);
static int i2GetStatus(i2ChanStrPtr, int);
static int i2Input(i2ChanStrPtr);
static int i2InputFlush(i2ChanStrPtr);
static int i2Output(i2ChanStrPtr, const char *, int, int);
static int i2OutputFree(i2ChanStrPtr);
static int i2ServiceBoard(i2eBordStrPtr);
static void i2DrainOutput(i2ChanStrPtr, int);
#ifdef IP2DEBUG_TRACE
void ip2trace(unsigned short,unsigned char,unsigned char,unsigned long,...);
#else
#define ip2trace(a,b,c,d...) do {} while (0)
#endif
// Argument to i2QueueCommands
//
#define C_IN_LINE 1
#define C_BYPASS 0
#endif // I2LIB_H
