mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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f061c5847b
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
352 lines
12 KiB
C
352 lines
12 KiB
C
/*******************************************************************************
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*
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* (c) 1998 by Computone Corporation
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*
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********************************************************************************
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*
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*
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* PACKAGE: Linux tty Device Driver for IntelliPort II family of multiport
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* serial I/O controllers.
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*
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* DESCRIPTION: Header file for high level library functions
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*
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*******************************************************************************/
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#ifndef I2LIB_H
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#define I2LIB_H 1
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//------------------------------------------------------------------------------
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// I2LIB.H
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//
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// IntelliPort-II and IntelliPort-IIEX
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//
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// Defines, structure definitions, and external declarations for i2lib.c
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//------------------------------------------------------------------------------
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//--------------------------------------
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// Mandatory Includes:
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//--------------------------------------
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#include "ip2types.h"
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#include "i2ellis.h"
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#include "i2pack.h"
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#include "i2cmd.h"
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#include <linux/workqueue.h>
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//------------------------------------------------------------------------------
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// i2ChanStr -- Channel Structure:
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// Used to track per-channel information for the library routines using standard
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// loadware. Note also, a pointer to an array of these structures is patched
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// into the i2eBordStr (see i2ellis.h)
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//------------------------------------------------------------------------------
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//
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// If we make some limits on the maximum block sizes, we can avoid dealing with
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// buffer wrap. The wrapping of the buffer is based on where the start of the
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// packet is. Then there is always room for the packet contiguously.
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//
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// Maximum total length of an outgoing data or in-line command block. The limit
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// of 36 on data is quite arbitrary and based more on DOS memory limitations
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// than the board interface. However, for commands, the maximum packet length is
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// MAX_CMD_PACK_SIZE, because the field size for the count is only a few bits
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// (see I2PACK.H) in such packets. For data packets, the count field size is not
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// the limiting factor. As of this writing, MAX_OBUF_BLOCK < MAX_CMD_PACK_SIZE,
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// but be careful if wanting to modify either.
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//
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#define MAX_OBUF_BLOCK 36
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// Another note on maximum block sizes: we are buffering packets here. Data is
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// put into the buffer (if there is room) regardless of the credits from the
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// board. The board sends new credits whenever it has removed from his buffers a
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// number of characters equal to 80% of total buffer size. (Of course, the total
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// buffer size is what is reported when the very first set of flow control
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// status packets are received from the board. Therefore, to be robust, you must
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// always fill the board to at least 80% of the current credit limit, else you
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// might not give it enough to trigger a new report. These conditions are
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// obtained here so long as the maximum output block size is less than 20% the
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// size of the board's output buffers. This is true at present by "coincidence"
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// or "infernal knowledge": the board's output buffers are at least 700 bytes
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// long (20% = 140 bytes, at least). The 80% figure is "official", so the safest
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// strategy might be to trap the first flow control report and guarantee that
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// the effective maxObufBlock is the minimum of MAX_OBUF_BLOCK and 20% of first
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// reported buffer credit.
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//
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#define MAX_CBUF_BLOCK 6 // Maximum total length of a bypass command block
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#define IBUF_SIZE 512 // character capacity of input buffer per channel
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#define OBUF_SIZE 1024// character capacity of output buffer per channel
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#define CBUF_SIZE 10 // character capacity of output bypass buffer
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typedef struct _i2ChanStr
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{
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// First, back-pointers so that given a pointer to this structure, you can
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// determine the correct board and channel number to reference, (say, when
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// issuing commands, etc. (Note, channel number is in infl.hd.i2sChannel.)
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int port_index; // Index of port in channel structure array attached
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// to board structure.
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PTTY pTTY; // Pointer to tty structure for port (OS specific)
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USHORT validity; // Indicates whether the given channel has been
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// initialized, really exists (or is a missing
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// channel, e.g. channel 9 on an 8-port box.)
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i2eBordStrPtr pMyBord; // Back-pointer to this channel's board structure
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int wopen; // waiting fer carrier
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int throttled; // Set if upper layer can take no data
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int flags; // Defined in tty.h
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PWAITQ open_wait; // Pointer for OS sleep function.
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PWAITQ close_wait; // Pointer for OS sleep function.
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PWAITQ delta_msr_wait;// Pointer for OS sleep function.
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PWAITQ dss_now_wait; // Pointer for OS sleep function.
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struct timer_list BookmarkTimer; // Used by i2DrainOutput
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wait_queue_head_t pBookmarkWait; // Used by i2DrainOutput
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int BaudBase;
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int BaudDivisor;
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USHORT ClosingDelay;
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USHORT ClosingWaitTime;
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volatile
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flowIn infl; // This structure is initialized as a completely
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// formed flow-control command packet, and as such
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// has the channel number, also the capacity and
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// "as-of" data needed continuously.
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USHORT sinceLastFlow; // Counts the number of characters read from input
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// buffers, since the last time flow control info
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// was sent.
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USHORT whenSendFlow; // Determines when new flow control is to be sent to
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// the board. Note unlike earlier manifestations of
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// the driver, these packets can be sent from
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// in-place.
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USHORT channelNeeds; // Bit map of important things which must be done
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// for this channel. (See bits below )
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volatile
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flowStat outfl; // Same type of structure is used to hold current
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// flow control information used to control our
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// output. "asof" is kept updated as data is sent,
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// and "room" never goes to zero.
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// The incoming ring buffer
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// Unlike the outgoing buffers, this holds raw data, not packets. The two
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// extra bytes are used to hold the byte-padding when there is room for an
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// odd number of bytes before we must wrap.
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//
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UCHAR Ibuf[IBUF_SIZE + 2];
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volatile
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USHORT Ibuf_stuff; // Stuffing index
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volatile
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USHORT Ibuf_strip; // Stripping index
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// The outgoing ring-buffer: Holds Data and command packets. N.B., even
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// though these are in the channel structure, the channel is also written
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// here, the easier to send it to the fifo when ready. HOWEVER, individual
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// packets here are NOT padded to even length: the routines for writing
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// blocks to the fifo will pad to even byte counts.
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//
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UCHAR Obuf[OBUF_SIZE+MAX_OBUF_BLOCK+4];
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volatile
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USHORT Obuf_stuff; // Stuffing index
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volatile
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USHORT Obuf_strip; // Stripping index
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int Obuf_char_count;
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// The outgoing bypass-command buffer. Unlike earlier manifestations, the
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// flow control packets are sent directly from the structures. As above, the
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// channel number is included in the packet, but they are NOT padded to even
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// size.
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//
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UCHAR Cbuf[CBUF_SIZE+MAX_CBUF_BLOCK+2];
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volatile
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USHORT Cbuf_stuff; // Stuffing index
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volatile
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USHORT Cbuf_strip; // Stripping index
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// The temporary buffer for the Linux tty driver PutChar entry.
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//
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UCHAR Pbuf[MAX_OBUF_BLOCK - sizeof (i2DataHeader)];
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volatile
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USHORT Pbuf_stuff; // Stuffing index
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// The state of incoming data-set signals
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//
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USHORT dataSetIn; // Bit-mapped according to below. Also indicates
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// whether a break has been detected since last
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// inquiry.
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// The state of outcoming data-set signals (as far as we can tell!)
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//
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USHORT dataSetOut; // Bit-mapped according to below.
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// Most recent hot-key identifier detected
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//
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USHORT hotKeyIn; // Hot key as sent by the board, HOT_CLEAR indicates
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// no hot key detected since last examined.
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// Counter of outstanding requests for bookmarks
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//
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short bookMarks; // Number of outstanding bookmark requests, (+ive
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// whenever a bookmark request if queued up, -ive
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// whenever a bookmark is received).
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// Misc options
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//
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USHORT channelOptions; // See below
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// To store various incoming special packets
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//
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debugStat channelStatus;
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cntStat channelRcount;
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cntStat channelTcount;
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failStat channelFail;
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// To store the last values for line characteristics we sent to the board.
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//
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int speed;
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int flush_flags;
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void (*trace)(unsigned short,unsigned char,unsigned char,unsigned long,...);
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/*
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* Kernel counters for the 4 input interrupts
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*/
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struct async_icount icount;
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/*
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* Task queues for processing input packets from the board.
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*/
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struct work_struct tqueue_input;
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struct work_struct tqueue_status;
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struct work_struct tqueue_hangup;
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rwlock_t Ibuf_spinlock;
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rwlock_t Obuf_spinlock;
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rwlock_t Cbuf_spinlock;
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rwlock_t Pbuf_spinlock;
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} i2ChanStr, *i2ChanStrPtr;
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//---------------------------------------------------
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// Manifests and bit-maps for elements in i2ChanStr
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//---------------------------------------------------
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//
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// flush flags
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//
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#define STARTFL_FLAG 1
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#define STOPFL_FLAG 2
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// validity
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//
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#define CHANNEL_MAGIC_BITS 0xff00
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#define CHANNEL_MAGIC 0x5300 // (validity & CHANNEL_MAGIC_BITS) ==
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// CHANNEL_MAGIC --> structure good
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#define CHANNEL_SUPPORT 0x0001 // Indicates channel is supported, exists,
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// and passed P.O.S.T.
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// channelNeeds
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//
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#define NEED_FLOW 1 // Indicates flow control has been queued
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#define NEED_INLINE 2 // Indicates inline commands or data queued
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#define NEED_BYPASS 4 // Indicates bypass commands queued
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#define NEED_CREDIT 8 // Indicates would be sending except has not sufficient
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// credit. The data is still in the channel structure,
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// but the channel is not enqueued in the board
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// structure again until there is a credit received from
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// the board.
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// dataSetIn (Also the bits for i2GetStatus return value)
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//
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#define I2_DCD 1
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#define I2_CTS 2
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#define I2_DSR 4
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#define I2_RI 8
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// dataSetOut (Also the bits for i2GetStatus return value)
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//
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#define I2_DTR 1
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#define I2_RTS 2
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// i2GetStatus() can optionally clear these bits
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//
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#define I2_BRK 0x10 // A break was detected
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#define I2_PAR 0x20 // A parity error was received
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#define I2_FRA 0x40 // A framing error was received
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#define I2_OVR 0x80 // An overrun error was received
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// i2GetStatus() automatically clears these bits */
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//
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#define I2_DDCD 0x100 // DCD changed from its former value
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#define I2_DCTS 0x200 // CTS changed from its former value
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#define I2_DDSR 0x400 // DSR changed from its former value
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#define I2_DRI 0x800 // RI changed from its former value
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// hotKeyIn
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//
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#define HOT_CLEAR 0x1322 // Indicates that no hot-key has been detected
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// channelOptions
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//
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#define CO_NBLOCK_WRITE 1 // Writes don't block waiting for buffer. (Default
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// is, they do wait.)
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// fcmodes
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//
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#define I2_OUTFLOW_CTS 0x0001
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#define I2_INFLOW_RTS 0x0002
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#define I2_INFLOW_DSR 0x0004
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#define I2_INFLOW_DTR 0x0008
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#define I2_OUTFLOW_DSR 0x0010
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#define I2_OUTFLOW_DTR 0x0020
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#define I2_OUTFLOW_XON 0x0040
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#define I2_OUTFLOW_XANY 0x0080
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#define I2_INFLOW_XON 0x0100
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#define I2_CRTSCTS (I2_OUTFLOW_CTS|I2_INFLOW_RTS)
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#define I2_IXANY_MODE (I2_OUTFLOW_XON|I2_OUTFLOW_XANY)
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//-------------------------------------------
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// Macros used from user level like functions
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//-------------------------------------------
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// Macros to set and clear channel options
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//
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#define i2SetOption(pCh, option) pCh->channelOptions |= option
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#define i2ClrOption(pCh, option) pCh->channelOptions &= ~option
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// Macro to set fatal-error trap
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//
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#define i2SetFatalTrap(pB, routine) pB->i2eFatalTrap = routine
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//--------------------------------------------
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// Declarations and prototypes for i2lib.c
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//--------------------------------------------
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//
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static int i2InitChannels(i2eBordStrPtr, int, i2ChanStrPtr);
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static int i2QueueCommands(int, i2ChanStrPtr, int, int, cmdSyntaxPtr,...);
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static int i2GetStatus(i2ChanStrPtr, int);
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static int i2Input(i2ChanStrPtr);
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static int i2InputFlush(i2ChanStrPtr);
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static int i2Output(i2ChanStrPtr, const char *, int);
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static int i2OutputFree(i2ChanStrPtr);
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static int i2ServiceBoard(i2eBordStrPtr);
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static void i2DrainOutput(i2ChanStrPtr, int);
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#ifdef IP2DEBUG_TRACE
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void ip2trace(unsigned short,unsigned char,unsigned char,unsigned long,...);
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#else
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#define ip2trace(a,b,c,d...) do {} while (0)
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#endif
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// Argument to i2QueueCommands
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//
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#define C_IN_LINE 1
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#define C_BYPASS 0
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#endif // I2LIB_H
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