blob: 6025e1866c7e5e0afeb74dbd74a979b77795da5d [file] [log] [blame]
/*
Copyright (C) 1996 Digi International.
For technical support please email digiLinux@dgii.com or
call Digi tech support at (612) 912-3456
Much of this design and code came from epca.c which was
copyright (C) 1994, 1995 Troy De Jongh, and subsquently
modified by David Nugent, Christoph Lameter, Mike McLagan.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
--------------------------------------------------------------------------- */
/* See README.epca for change history --DAT*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/serial.h>
#include <linux/delay.h>
#include <linux/ctype.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/slab.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#ifdef CONFIG_PCI
#define ENABLE_PCI
#endif /* CONFIG_PCI */
#define putUser(arg1, arg2) put_user(arg1, (unsigned long __user *)arg2)
#define getUser(arg1, arg2) get_user(arg1, (unsigned __user *)arg2)
#ifdef ENABLE_PCI
#include <linux/pci.h>
#include "digiPCI.h"
#endif /* ENABLE_PCI */
#include "digi1.h"
#include "digiFep1.h"
#include "epca.h"
#include "epcaconfig.h"
#if BITS_PER_LONG != 32
# error FIXME: this driver only works on 32-bit platforms
#endif
/* ---------------------- Begin defines ------------------------ */
#define VERSION "1.3.0.1-LK"
/* This major needs to be submitted to Linux to join the majors list */
#define DIGIINFOMAJOR 35 /* For Digi specific ioctl */
#define MAXCARDS 7
#define epcaassert(x, msg) if (!(x)) epca_error(__LINE__, msg)
#define PFX "epca: "
/* ----------------- Begin global definitions ------------------- */
static char mesg[100];
static int nbdevs, num_cards, liloconfig;
static int digi_poller_inhibited = 1 ;
static int setup_error_code;
static int invalid_lilo_config;
/* -----------------------------------------------------------------------
MAXBOARDS is typically 12, but ISA and EISA cards are restricted to
7 below.
--------------------------------------------------------------------------*/
static struct board_info boards[MAXBOARDS];
/* ------------- Begin structures used for driver registeration ---------- */
static struct tty_driver *pc_driver;
static struct tty_driver *pc_info;
/* ------------------ Begin Digi specific structures -------------------- */
/* ------------------------------------------------------------------------
digi_channels represents an array of structures that keep track of
each channel of the Digi product. Information such as transmit and
receive pointers, termio data, and signal definitions (DTR, CTS, etc ...)
are stored here. This structure is NOT used to overlay the cards
physical channel structure.
-------------------------------------------------------------------------- */
static struct channel digi_channels[MAX_ALLOC];
/* ------------------------------------------------------------------------
card_ptr is an array used to hold the address of the
first channel structure of each card. This array will hold
the addresses of various channels located in digi_channels.
-------------------------------------------------------------------------- */
static struct channel *card_ptr[MAXCARDS];
static struct timer_list epca_timer;
/* ---------------------- Begin function prototypes --------------------- */
/* ----------------------------------------------------------------------
Begin generic memory functions. These functions will be alias
(point at) more specific functions dependent on the board being
configured.
----------------------------------------------------------------------- */
static inline void memwinon(struct board_info *b, unsigned int win);
static inline void memwinoff(struct board_info *b, unsigned int win);
static inline void globalwinon(struct channel *ch);
static inline void rxwinon(struct channel *ch);
static inline void txwinon(struct channel *ch);
static inline void memoff(struct channel *ch);
static inline void assertgwinon(struct channel *ch);
static inline void assertmemoff(struct channel *ch);
/* ---- Begin more 'specific' memory functions for cx_like products --- */
static inline void pcxem_memwinon(struct board_info *b, unsigned int win);
static inline void pcxem_memwinoff(struct board_info *b, unsigned int win);
static inline void pcxem_globalwinon(struct channel *ch);
static inline void pcxem_rxwinon(struct channel *ch);
static inline void pcxem_txwinon(struct channel *ch);
static inline void pcxem_memoff(struct channel *ch);
/* ------ Begin more 'specific' memory functions for the pcxe ------- */
static inline void pcxe_memwinon(struct board_info *b, unsigned int win);
static inline void pcxe_memwinoff(struct board_info *b, unsigned int win);
static inline void pcxe_globalwinon(struct channel *ch);
static inline void pcxe_rxwinon(struct channel *ch);
static inline void pcxe_txwinon(struct channel *ch);
static inline void pcxe_memoff(struct channel *ch);
/* ---- Begin more 'specific' memory functions for the pc64xe and pcxi ---- */
/* Note : pc64xe and pcxi share the same windowing routines */
static inline void pcxi_memwinon(struct board_info *b, unsigned int win);
static inline void pcxi_memwinoff(struct board_info *b, unsigned int win);
static inline void pcxi_globalwinon(struct channel *ch);
static inline void pcxi_rxwinon(struct channel *ch);
static inline void pcxi_txwinon(struct channel *ch);
static inline void pcxi_memoff(struct channel *ch);
/* - Begin 'specific' do nothing memory functions needed for some cards - */
static inline void dummy_memwinon(struct board_info *b, unsigned int win);
static inline void dummy_memwinoff(struct board_info *b, unsigned int win);
static inline void dummy_globalwinon(struct channel *ch);
static inline void dummy_rxwinon(struct channel *ch);
static inline void dummy_txwinon(struct channel *ch);
static inline void dummy_memoff(struct channel *ch);
static inline void dummy_assertgwinon(struct channel *ch);
static inline void dummy_assertmemoff(struct channel *ch);
/* ------------------- Begin declare functions ----------------------- */
static inline struct channel *verifyChannel(register struct tty_struct *);
static inline void pc_sched_event(struct channel *, int);
static void epca_error(int, char *);
static void pc_close(struct tty_struct *, struct file *);
static void shutdown(struct channel *);
static void pc_hangup(struct tty_struct *);
static void pc_put_char(struct tty_struct *, unsigned char);
static int pc_write_room(struct tty_struct *);
static int pc_chars_in_buffer(struct tty_struct *);
static void pc_flush_buffer(struct tty_struct *);
static void pc_flush_chars(struct tty_struct *);
static int block_til_ready(struct tty_struct *, struct file *,
struct channel *);
static int pc_open(struct tty_struct *, struct file *);
static void post_fep_init(unsigned int crd);
static void epcapoll(unsigned long);
static void doevent(int);
static void fepcmd(struct channel *, int, int, int, int, int);
static unsigned termios2digi_h(struct channel *ch, unsigned);
static unsigned termios2digi_i(struct channel *ch, unsigned);
static unsigned termios2digi_c(struct channel *ch, unsigned);
static void epcaparam(struct tty_struct *, struct channel *);
static void receive_data(struct channel *);
static int pc_ioctl(struct tty_struct *, struct file *,
unsigned int, unsigned long);
static int info_ioctl(struct tty_struct *, struct file *,
unsigned int, unsigned long);
static void pc_set_termios(struct tty_struct *, struct termios *);
static void do_softint(void *);
static void pc_stop(struct tty_struct *);
static void pc_start(struct tty_struct *);
static void pc_throttle(struct tty_struct * tty);
static void pc_unthrottle(struct tty_struct *tty);
static void digi_send_break(struct channel *ch, int msec);
static void setup_empty_event(struct tty_struct *tty, struct channel *ch);
void epca_setup(char *, int *);
void console_print(const char *);
static int get_termio(struct tty_struct *, struct termio __user *);
static int pc_write(struct tty_struct *, const unsigned char *, int);
int pc_init(void);
#ifdef ENABLE_PCI
static int init_PCI(void);
#endif /* ENABLE_PCI */
/* ------------------------------------------------------------------
Table of functions for each board to handle memory. Mantaining
parallelism is a *very* good idea here. The idea is for the
runtime code to blindly call these functions, not knowing/caring
about the underlying hardware. This stuff should contain no
conditionals; if more functionality is needed a different entry
should be established. These calls are the interface calls and
are the only functions that should be accessed. Anyone caught
making direct calls deserves what they get.
-------------------------------------------------------------------- */
static inline void memwinon(struct board_info *b, unsigned int win)
{
(b->memwinon)(b, win);
}
static inline void memwinoff(struct board_info *b, unsigned int win)
{
(b->memwinoff)(b, win);
}
static inline void globalwinon(struct channel *ch)
{
(ch->board->globalwinon)(ch);
}
static inline void rxwinon(struct channel *ch)
{
(ch->board->rxwinon)(ch);
}
static inline void txwinon(struct channel *ch)
{
(ch->board->txwinon)(ch);
}
static inline void memoff(struct channel *ch)
{
(ch->board->memoff)(ch);
}
static inline void assertgwinon(struct channel *ch)
{
(ch->board->assertgwinon)(ch);
}
static inline void assertmemoff(struct channel *ch)
{
(ch->board->assertmemoff)(ch);
}
/* ---------------------------------------------------------
PCXEM windowing is the same as that used in the PCXR
and CX series cards.
------------------------------------------------------------ */
static inline void pcxem_memwinon(struct board_info *b, unsigned int win)
{
outb_p(FEPWIN|win, (int)b->port + 1);
}
static inline void pcxem_memwinoff(struct board_info *b, unsigned int win)
{
outb_p(0, (int)b->port + 1);
}
static inline void pcxem_globalwinon(struct channel *ch)
{
outb_p( FEPWIN, (int)ch->board->port + 1);
}
static inline void pcxem_rxwinon(struct channel *ch)
{
outb_p(ch->rxwin, (int)ch->board->port + 1);
}
static inline void pcxem_txwinon(struct channel *ch)
{
outb_p(ch->txwin, (int)ch->board->port + 1);
}
static inline void pcxem_memoff(struct channel *ch)
{
outb_p(0, (int)ch->board->port + 1);
}
/* ----------------- Begin pcxe memory window stuff ------------------ */
static inline void pcxe_memwinon(struct board_info *b, unsigned int win)
{
outb_p(FEPWIN | win, (int)b->port + 1);
}
static inline void pcxe_memwinoff(struct board_info *b, unsigned int win)
{
outb_p(inb((int)b->port) & ~FEPMEM,
(int)b->port + 1);
outb_p(0, (int)b->port + 1);
}
static inline void pcxe_globalwinon(struct channel *ch)
{
outb_p( FEPWIN, (int)ch->board->port + 1);
}
static inline void pcxe_rxwinon(struct channel *ch)
{
outb_p(ch->rxwin, (int)ch->board->port + 1);
}
static inline void pcxe_txwinon(struct channel *ch)
{
outb_p(ch->txwin, (int)ch->board->port + 1);
}
static inline void pcxe_memoff(struct channel *ch)
{
outb_p(0, (int)ch->board->port);
outb_p(0, (int)ch->board->port + 1);
}
/* ------------- Begin pc64xe and pcxi memory window stuff -------------- */
static inline void pcxi_memwinon(struct board_info *b, unsigned int win)
{
outb_p(inb((int)b->port) | FEPMEM, (int)b->port);
}
static inline void pcxi_memwinoff(struct board_info *b, unsigned int win)
{
outb_p(inb((int)b->port) & ~FEPMEM, (int)b->port);
}
static inline void pcxi_globalwinon(struct channel *ch)
{
outb_p(FEPMEM, (int)ch->board->port);
}
static inline void pcxi_rxwinon(struct channel *ch)
{
outb_p(FEPMEM, (int)ch->board->port);
}
static inline void pcxi_txwinon(struct channel *ch)
{
outb_p(FEPMEM, (int)ch->board->port);
}
static inline void pcxi_memoff(struct channel *ch)
{
outb_p(0, (int)ch->board->port);
}
static inline void pcxi_assertgwinon(struct channel *ch)
{
epcaassert(inb((int)ch->board->port) & FEPMEM, "Global memory off");
}
static inline void pcxi_assertmemoff(struct channel *ch)
{
epcaassert(!(inb((int)ch->board->port) & FEPMEM), "Memory on");
}
/* ----------------------------------------------------------------------
Not all of the cards need specific memory windowing routines. Some
cards (Such as PCI) needs no windowing routines at all. We provide
these do nothing routines so that the same code base can be used.
The driver will ALWAYS call a windowing routine if it thinks it needs
to; regardless of the card. However, dependent on the card the routine
may or may not do anything.
---------------------------------------------------------------------------*/
static inline void dummy_memwinon(struct board_info *b, unsigned int win)
{
}
static inline void dummy_memwinoff(struct board_info *b, unsigned int win)
{
}
static inline void dummy_globalwinon(struct channel *ch)
{
}
static inline void dummy_rxwinon(struct channel *ch)
{
}
static inline void dummy_txwinon(struct channel *ch)
{
}
static inline void dummy_memoff(struct channel *ch)
{
}
static inline void dummy_assertgwinon(struct channel *ch)
{
}
static inline void dummy_assertmemoff(struct channel *ch)
{
}
/* ----------------- Begin verifyChannel function ----------------------- */
static inline struct channel *verifyChannel(register struct tty_struct *tty)
{ /* Begin verifyChannel */
/* --------------------------------------------------------------------
This routine basically provides a sanity check. It insures that
the channel returned is within the proper range of addresses as
well as properly initialized. If some bogus info gets passed in
through tty->driver_data this should catch it.
--------------------------------------------------------------------- */
if (tty)
{ /* Begin if tty */
register struct channel *ch = (struct channel *)tty->driver_data;
if ((ch >= &digi_channels[0]) && (ch < &digi_channels[nbdevs]))
{
if (ch->magic == EPCA_MAGIC)
return ch;
}
} /* End if tty */
/* Else return a NULL for invalid */
return NULL;
} /* End verifyChannel */
/* ------------------ Begin pc_sched_event ------------------------- */
static inline void pc_sched_event(struct channel *ch, int event)
{ /* Begin pc_sched_event */
/* ----------------------------------------------------------------------
We call this to schedule interrupt processing on some event. The
kernel sees our request and calls the related routine in OUR driver.
-------------------------------------------------------------------------*/
ch->event |= 1 << event;
schedule_work(&ch->tqueue);
} /* End pc_sched_event */
/* ------------------ Begin epca_error ------------------------- */
static void epca_error(int line, char *msg)
{ /* Begin epca_error */
printk(KERN_ERR "epca_error (Digi): line = %d %s\n",line,msg);
return;
} /* End epca_error */
/* ------------------ Begin pc_close ------------------------- */
static void pc_close(struct tty_struct * tty, struct file * filp)
{ /* Begin pc_close */
struct channel *ch;
unsigned long flags;
/* ---------------------------------------------------------
verifyChannel returns the channel from the tty struct
if it is valid. This serves as a sanity check.
------------------------------------------------------------- */
if ((ch = verifyChannel(tty)) != NULL)
{ /* Begin if ch != NULL */
save_flags(flags);
cli();
if (tty_hung_up_p(filp))
{
restore_flags(flags);
return;
}
/* Check to see if the channel is open more than once */
if (ch->count-- > 1)
{ /* Begin channel is open more than once */
/* -------------------------------------------------------------
Return without doing anything. Someone might still be using
the channel.
---------------------------------------------------------------- */
restore_flags(flags);
return;
} /* End channel is open more than once */
/* Port open only once go ahead with shutdown & reset */
if (ch->count < 0)
{
ch->count = 0;
}
/* ---------------------------------------------------------------
Let the rest of the driver know the channel is being closed.
This becomes important if an open is attempted before close
is finished.
------------------------------------------------------------------ */
ch->asyncflags |= ASYNC_CLOSING;
tty->closing = 1;
if (ch->asyncflags & ASYNC_INITIALIZED)
{
/* Setup an event to indicate when the transmit buffer empties */
setup_empty_event(tty, ch);
tty_wait_until_sent(tty, 3000); /* 30 seconds timeout */
}
if (tty->driver->flush_buffer)
tty->driver->flush_buffer(tty);
tty_ldisc_flush(tty);
shutdown(ch);
tty->closing = 0;
ch->event = 0;
ch->tty = NULL;
if (ch->blocked_open)
{ /* Begin if blocked_open */
if (ch->close_delay)
{
msleep_interruptible(jiffies_to_msecs(ch->close_delay));
}
wake_up_interruptible(&ch->open_wait);
} /* End if blocked_open */
ch->asyncflags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_INITIALIZED |
ASYNC_CLOSING);
wake_up_interruptible(&ch->close_wait);
restore_flags(flags);
} /* End if ch != NULL */
} /* End pc_close */
/* ------------------ Begin shutdown ------------------------- */
static void shutdown(struct channel *ch)
{ /* Begin shutdown */
unsigned long flags;
struct tty_struct *tty;
volatile struct board_chan *bc;
if (!(ch->asyncflags & ASYNC_INITIALIZED))
return;
save_flags(flags);
cli();
globalwinon(ch);
bc = ch->brdchan;
/* ------------------------------------------------------------------
In order for an event to be generated on the receipt of data the
idata flag must be set. Since we are shutting down, this is not
necessary clear this flag.
--------------------------------------------------------------------- */
if (bc)
bc->idata = 0;
tty = ch->tty;
/* ----------------------------------------------------------------
If we're a modem control device and HUPCL is on, drop RTS & DTR.
------------------------------------------------------------------ */
if (tty->termios->c_cflag & HUPCL)
{
ch->omodem &= ~(ch->m_rts | ch->m_dtr);
fepcmd(ch, SETMODEM, 0, ch->m_dtr | ch->m_rts, 10, 1);
}
memoff(ch);
/* ------------------------------------------------------------------
The channel has officialy been closed. The next time it is opened
it will have to reinitialized. Set a flag to indicate this.
---------------------------------------------------------------------- */
/* Prevent future Digi programmed interrupts from coming active */
ch->asyncflags &= ~ASYNC_INITIALIZED;
restore_flags(flags);
} /* End shutdown */
/* ------------------ Begin pc_hangup ------------------------- */
static void pc_hangup(struct tty_struct *tty)
{ /* Begin pc_hangup */
struct channel *ch;
/* ---------------------------------------------------------
verifyChannel returns the channel from the tty struct
if it is valid. This serves as a sanity check.
------------------------------------------------------------- */
if ((ch = verifyChannel(tty)) != NULL)
{ /* Begin if ch != NULL */
unsigned long flags;
save_flags(flags);
cli();
if (tty->driver->flush_buffer)
tty->driver->flush_buffer(tty);
tty_ldisc_flush(tty);
shutdown(ch);
ch->tty = NULL;
ch->event = 0;
ch->count = 0;
restore_flags(flags);
ch->asyncflags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_INITIALIZED);
wake_up_interruptible(&ch->open_wait);
} /* End if ch != NULL */
} /* End pc_hangup */
/* ------------------ Begin pc_write ------------------------- */
static int pc_write(struct tty_struct * tty,
const unsigned char *buf, int bytesAvailable)
{ /* Begin pc_write */
register unsigned int head, tail;
register int dataLen;
register int size;
register int amountCopied;
struct channel *ch;
unsigned long flags;
int remain;
volatile struct board_chan *bc;
/* ----------------------------------------------------------------
pc_write is primarily called directly by the kernel routine
tty_write (Though it can also be called by put_char) found in
tty_io.c. pc_write is passed a line discipline buffer where
the data to be written out is stored. The line discipline
implementation itself is done at the kernel level and is not
brought into the driver.
------------------------------------------------------------------- */
/* ---------------------------------------------------------
verifyChannel returns the channel from the tty struct
if it is valid. This serves as a sanity check.
------------------------------------------------------------- */
if ((ch = verifyChannel(tty)) == NULL)
return 0;
/* Make a pointer to the channel data structure found on the board. */
bc = ch->brdchan;
size = ch->txbufsize;
amountCopied = 0;
save_flags(flags);
cli();
globalwinon(ch);
head = bc->tin & (size - 1);
tail = bc->tout;
if (tail != bc->tout)
tail = bc->tout;
tail &= (size - 1);
/* If head >= tail, head has not wrapped around. */
if (head >= tail)
{ /* Begin head has not wrapped */
/* ---------------------------------------------------------------
remain (much like dataLen above) represents the total amount of
space available on the card for data. Here dataLen represents
the space existing between the head pointer and the end of
buffer. This is important because a memcpy cannot be told to
automatically wrap around when it hits the buffer end.
------------------------------------------------------------------ */
dataLen = size - head;
remain = size - (head - tail) - 1;
} /* End head has not wrapped */
else
{ /* Begin head has wrapped around */
remain = tail - head - 1;
dataLen = remain;
} /* End head has wrapped around */
/* -------------------------------------------------------------------
Check the space on the card. If we have more data than
space; reduce the amount of data to fit the space.
---------------------------------------------------------------------- */
bytesAvailable = min(remain, bytesAvailable);
txwinon(ch);
while (bytesAvailable > 0)
{ /* Begin while there is data to copy onto card */
/* -----------------------------------------------------------------
If head is not wrapped, the below will make sure the first
data copy fills to the end of card buffer.
------------------------------------------------------------------- */
dataLen = min(bytesAvailable, dataLen);
memcpy(ch->txptr + head, buf, dataLen);
buf += dataLen;
head += dataLen;
amountCopied += dataLen;
bytesAvailable -= dataLen;
if (head >= size)
{
head = 0;
dataLen = tail;
}
} /* End while there is data to copy onto card */
ch->statusflags |= TXBUSY;
globalwinon(ch);
bc->tin = head;
if ((ch->statusflags & LOWWAIT) == 0)
{
ch->statusflags |= LOWWAIT;
bc->ilow = 1;
}
memoff(ch);
restore_flags(flags);
return(amountCopied);
} /* End pc_write */
/* ------------------ Begin pc_put_char ------------------------- */
static void pc_put_char(struct tty_struct *tty, unsigned char c)
{ /* Begin pc_put_char */
pc_write(tty, &c, 1);
return;
} /* End pc_put_char */
/* ------------------ Begin pc_write_room ------------------------- */
static int pc_write_room(struct tty_struct *tty)
{ /* Begin pc_write_room */
int remain;
struct channel *ch;
unsigned long flags;
unsigned int head, tail;
volatile struct board_chan *bc;
remain = 0;
/* ---------------------------------------------------------
verifyChannel returns the channel from the tty struct
if it is valid. This serves as a sanity check.
------------------------------------------------------------- */
if ((ch = verifyChannel(tty)) != NULL)
{
save_flags(flags);
cli();
globalwinon(ch);
bc = ch->brdchan;
head = bc->tin & (ch->txbufsize - 1);
tail = bc->tout;
if (tail != bc->tout)
tail = bc->tout;
/* Wrap tail if necessary */
tail &= (ch->txbufsize - 1);
if ((remain = tail - head - 1) < 0 )
remain += ch->txbufsize;
if (remain && (ch->statusflags & LOWWAIT) == 0)
{
ch->statusflags |= LOWWAIT;
bc->ilow = 1;
}
memoff(ch);
restore_flags(flags);
}
/* Return how much room is left on card */
return remain;
} /* End pc_write_room */
/* ------------------ Begin pc_chars_in_buffer ---------------------- */
static int pc_chars_in_buffer(struct tty_struct *tty)
{ /* Begin pc_chars_in_buffer */
int chars;
unsigned int ctail, head, tail;
int remain;
unsigned long flags;
struct channel *ch;
volatile struct board_chan *bc;
/* ---------------------------------------------------------
verifyChannel returns the channel from the tty struct
if it is valid. This serves as a sanity check.
------------------------------------------------------------- */
if ((ch = verifyChannel(tty)) == NULL)
return(0);
save_flags(flags);
cli();
globalwinon(ch);
bc = ch->brdchan;
tail = bc->tout;
head = bc->tin;
ctail = ch->mailbox->cout;
if (tail == head && ch->mailbox->cin == ctail && bc->tbusy == 0)
chars = 0;
else
{ /* Begin if some space on the card has been used */
head = bc->tin & (ch->txbufsize - 1);
tail &= (ch->txbufsize - 1);
/* --------------------------------------------------------------
The logic here is basically opposite of the above pc_write_room
here we are finding the amount of bytes in the buffer filled.
Not the amount of bytes empty.
------------------------------------------------------------------- */
if ((remain = tail - head - 1) < 0 )
remain += ch->txbufsize;
chars = (int)(ch->txbufsize - remain);
/* -------------------------------------------------------------
Make it possible to wakeup anything waiting for output
in tty_ioctl.c, etc.
If not already set. Setup an event to indicate when the
transmit buffer empties
----------------------------------------------------------------- */
if (!(ch->statusflags & EMPTYWAIT))
setup_empty_event(tty,ch);
} /* End if some space on the card has been used */
memoff(ch);
restore_flags(flags);
/* Return number of characters residing on card. */
return(chars);
} /* End pc_chars_in_buffer */
/* ------------------ Begin pc_flush_buffer ---------------------- */
static void pc_flush_buffer(struct tty_struct *tty)
{ /* Begin pc_flush_buffer */
unsigned int tail;
unsigned long flags;
struct channel *ch;
volatile struct board_chan *bc;
/* ---------------------------------------------------------
verifyChannel returns the channel from the tty struct
if it is valid. This serves as a sanity check.
------------------------------------------------------------- */
if ((ch = verifyChannel(tty)) == NULL)
return;
save_flags(flags);
cli();
globalwinon(ch);
bc = ch->brdchan;
tail = bc->tout;
/* Have FEP move tout pointer; effectively flushing transmit buffer */
fepcmd(ch, STOUT, (unsigned) tail, 0, 0, 0);
memoff(ch);
restore_flags(flags);
wake_up_interruptible(&tty->write_wait);
tty_wakeup(tty);
} /* End pc_flush_buffer */
/* ------------------ Begin pc_flush_chars ---------------------- */
static void pc_flush_chars(struct tty_struct *tty)
{ /* Begin pc_flush_chars */
struct channel * ch;
/* ---------------------------------------------------------
verifyChannel returns the channel from the tty struct
if it is valid. This serves as a sanity check.
------------------------------------------------------------- */
if ((ch = verifyChannel(tty)) != NULL)
{
unsigned long flags;
save_flags(flags);
cli();
/* ----------------------------------------------------------------
If not already set and the transmitter is busy setup an event
to indicate when the transmit empties.
------------------------------------------------------------------- */
if ((ch->statusflags & TXBUSY) && !(ch->statusflags & EMPTYWAIT))
setup_empty_event(tty,ch);
restore_flags(flags);
}
} /* End pc_flush_chars */
/* ------------------ Begin block_til_ready ---------------------- */
static int block_til_ready(struct tty_struct *tty,
struct file *filp, struct channel *ch)
{ /* Begin block_til_ready */
DECLARE_WAITQUEUE(wait,current);
int retval, do_clocal = 0;
unsigned long flags;
if (tty_hung_up_p(filp))
{
if (ch->asyncflags & ASYNC_HUP_NOTIFY)
retval = -EAGAIN;
else
retval = -ERESTARTSYS;
return(retval);
}
/* -----------------------------------------------------------------
If the device is in the middle of being closed, then block
until it's done, and then try again.
-------------------------------------------------------------------- */
if (ch->asyncflags & ASYNC_CLOSING)
{
interruptible_sleep_on(&ch->close_wait);
if (ch->asyncflags & ASYNC_HUP_NOTIFY)
return -EAGAIN;
else
return -ERESTARTSYS;
}
if (filp->f_flags & O_NONBLOCK)
{
/* -----------------------------------------------------------------
If non-blocking mode is set, then make the check up front
and then exit.
-------------------------------------------------------------------- */
ch->asyncflags |= ASYNC_NORMAL_ACTIVE;
return 0;
}
if (tty->termios->c_cflag & CLOCAL)
do_clocal = 1;
/* Block waiting for the carrier detect and the line to become free */
retval = 0;
add_wait_queue(&ch->open_wait, &wait);
save_flags(flags);
cli();
/* We dec count so that pc_close will know when to free things */
if (!tty_hung_up_p(filp))
ch->count--;
restore_flags(flags);
ch->blocked_open++;
while(1)
{ /* Begin forever while */
set_current_state(TASK_INTERRUPTIBLE);
if (tty_hung_up_p(filp) ||
!(ch->asyncflags & ASYNC_INITIALIZED))
{
if (ch->asyncflags & ASYNC_HUP_NOTIFY)
retval = -EAGAIN;
else
retval = -ERESTARTSYS;
break;
}
if (!(ch->asyncflags & ASYNC_CLOSING) &&
(do_clocal || (ch->imodem & ch->dcd)))
break;
if (signal_pending(current))
{
retval = -ERESTARTSYS;
break;
}
/* ---------------------------------------------------------------
Allow someone else to be scheduled. We will occasionally go
through this loop until one of the above conditions change.
The below schedule call will allow other processes to enter and
prevent this loop from hogging the cpu.
------------------------------------------------------------------ */
schedule();
} /* End forever while */
current->state = TASK_RUNNING;
remove_wait_queue(&ch->open_wait, &wait);
cli();
if (!tty_hung_up_p(filp))
ch->count++;
restore_flags(flags);
ch->blocked_open--;
if (retval)
return retval;
ch->asyncflags |= ASYNC_NORMAL_ACTIVE;
return 0;
} /* End block_til_ready */
/* ------------------ Begin pc_open ---------------------- */
static int pc_open(struct tty_struct *tty, struct file * filp)
{ /* Begin pc_open */
struct channel *ch;
unsigned long flags;
int line, retval, boardnum;
volatile struct board_chan *bc;
volatile unsigned int head;
line = tty->index;
if (line < 0 || line >= nbdevs)
{
printk(KERN_ERR "<Error> - pc_open : line out of range in pc_open\n");
tty->driver_data = NULL;
return(-ENODEV);
}
ch = &digi_channels[line];
boardnum = ch->boardnum;
/* Check status of board configured in system. */
/* -----------------------------------------------------------------
I check to see if the epca_setup routine detected an user error.
It might be better to put this in pc_init, but for the moment it
goes here.
---------------------------------------------------------------------- */
if (invalid_lilo_config)
{
if (setup_error_code & INVALID_BOARD_TYPE)
printk(KERN_ERR "<Error> - pc_open: Invalid board type specified in LILO command\n");
if (setup_error_code & INVALID_NUM_PORTS)
printk(KERN_ERR "<Error> - pc_open: Invalid number of ports specified in LILO command\n");
if (setup_error_code & INVALID_MEM_BASE)
printk(KERN_ERR "<Error> - pc_open: Invalid board memory address specified in LILO command\n");
if (setup_error_code & INVALID_PORT_BASE)
printk(KERN_ERR "<Error> - pc_open: Invalid board port address specified in LILO command\n");
if (setup_error_code & INVALID_BOARD_STATUS)
printk(KERN_ERR "<Error> - pc_open: Invalid board status specified in LILO command\n");
if (setup_error_code & INVALID_ALTPIN)
printk(KERN_ERR "<Error> - pc_open: Invalid board altpin specified in LILO command\n");
tty->driver_data = NULL; /* Mark this device as 'down' */
return(-ENODEV);
}
if ((boardnum >= num_cards) || (boards[boardnum].status == DISABLED))
{
tty->driver_data = NULL; /* Mark this device as 'down' */
return(-ENODEV);
}
if (( bc = ch->brdchan) == 0)
{
tty->driver_data = NULL;
return(-ENODEV);
}
/* ------------------------------------------------------------------
Every time a channel is opened, increment a counter. This is
necessary because we do not wish to flush and shutdown the channel
until the last app holding the channel open, closes it.
--------------------------------------------------------------------- */
ch->count++;
/* ----------------------------------------------------------------
Set a kernel structures pointer to our local channel
structure. This way we can get to it when passed only
a tty struct.
------------------------------------------------------------------ */
tty->driver_data = ch;
/* ----------------------------------------------------------------
If this is the first time the channel has been opened, initialize
the tty->termios struct otherwise let pc_close handle it.
-------------------------------------------------------------------- */
save_flags(flags);
cli();
globalwinon(ch);
ch->statusflags = 0;
/* Save boards current modem status */
ch->imodem = bc->mstat;
/* ----------------------------------------------------------------
Set receive head and tail ptrs to each other. This indicates
no data available to read.
----------------------------------------------------------------- */
head = bc->rin;
bc->rout = head;
/* Set the channels associated tty structure */
ch->tty = tty;
/* -----------------------------------------------------------------
The below routine generally sets up parity, baud, flow control
issues, etc.... It effect both control flags and input flags.
-------------------------------------------------------------------- */
epcaparam(tty,ch);
ch->asyncflags |= ASYNC_INITIALIZED;
memoff(ch);
restore_flags(flags);
retval = block_til_ready(tty, filp, ch);
if (retval)
{
return retval;
}
/* -------------------------------------------------------------
Set this again in case a hangup set it to zero while this
open() was waiting for the line...
--------------------------------------------------------------- */
ch->tty = tty;
save_flags(flags);
cli();
globalwinon(ch);
/* Enable Digi Data events */
bc->idata = 1;
memoff(ch);
restore_flags(flags);
return 0;
} /* End pc_open */
#ifdef MODULE
static int __init epca_module_init(void)
{ /* Begin init_module */
unsigned long flags;
save_flags(flags);
cli();
pc_init();
restore_flags(flags);
return(0);
}
module_init(epca_module_init);
#endif
#ifdef ENABLE_PCI
static struct pci_driver epca_driver;
#endif
#ifdef MODULE
/* -------------------- Begin cleanup_module ---------------------- */
static void __exit epca_module_exit(void)
{
int count, crd;
struct board_info *bd;
struct channel *ch;
unsigned long flags;
del_timer_sync(&epca_timer);
save_flags(flags);
cli();
if ((tty_unregister_driver(pc_driver)) ||
(tty_unregister_driver(pc_info)))
{
printk(KERN_WARNING "<Error> - DIGI : cleanup_module failed to un-register tty driver\n");
restore_flags(flags);
return;
}
put_tty_driver(pc_driver);
put_tty_driver(pc_info);
for (crd = 0; crd < num_cards; crd++)
{ /* Begin for each card */
bd = &boards[crd];
if (!bd)
{ /* Begin sanity check */
printk(KERN_ERR "<Error> - Digi : cleanup_module failed\n");
return;
} /* End sanity check */
ch = card_ptr[crd];
for (count = 0; count < bd->numports; count++, ch++)
{ /* Begin for each port */
if (ch)
{
if (ch->tty)
tty_hangup(ch->tty);
kfree(ch->tmp_buf);
}
} /* End for each port */
} /* End for each card */
#ifdef ENABLE_PCI
pci_unregister_driver (&epca_driver);
#endif
restore_flags(flags);
}
module_exit(epca_module_exit);
#endif /* MODULE */
static struct tty_operations pc_ops = {
.open = pc_open,
.close = pc_close,
.write = pc_write,
.write_room = pc_write_room,
.flush_buffer = pc_flush_buffer,
.chars_in_buffer = pc_chars_in_buffer,
.flush_chars = pc_flush_chars,
.put_char = pc_put_char,
.ioctl = pc_ioctl,
.set_termios = pc_set_termios,
.stop = pc_stop,
.start = pc_start,
.throttle = pc_throttle,
.unthrottle = pc_unthrottle,
.hangup = pc_hangup,
};
static int info_open(struct tty_struct *tty, struct file * filp)
{
return 0;
}
static struct tty_operations info_ops = {
.open = info_open,
.ioctl = info_ioctl,
};
/* ------------------ Begin pc_init ---------------------- */
int __init pc_init(void)
{ /* Begin pc_init */
/* ----------------------------------------------------------------
pc_init is called by the operating system during boot up prior to
any open calls being made. In the older versions of Linux (Prior
to 2.0.0) an entry is made into tty_io.c. A pointer to the last
memory location (from kernel space) used (kmem_start) is passed
to pc_init. It is pc_inits responsibility to modify this value
for any memory that the Digi driver might need and then return
this value to the operating system. For example if the driver
wishes to allocate 1K of kernel memory, pc_init would return
(kmem_start + 1024). This memory (Between kmem_start and kmem_start
+ 1024) would then be available for use exclusively by the driver.
In this case our driver does not allocate any of this kernel
memory.
------------------------------------------------------------------*/
ulong flags;
int crd;
struct board_info *bd;
unsigned char board_id = 0;
#ifdef ENABLE_PCI
int pci_boards_found, pci_count;
pci_count = 0;
#endif /* ENABLE_PCI */
pc_driver = alloc_tty_driver(MAX_ALLOC);
if (!pc_driver)
return -ENOMEM;
pc_info = alloc_tty_driver(MAX_ALLOC);
if (!pc_info) {
put_tty_driver(pc_driver);
return -ENOMEM;
}
/* -----------------------------------------------------------------------
If epca_setup has not been ran by LILO set num_cards to defaults; copy
board structure defined by digiConfig into drivers board structure.
Note : If LILO has ran epca_setup then epca_setup will handle defining
num_cards as well as copying the data into the board structure.
-------------------------------------------------------------------------- */
if (!liloconfig)
{ /* Begin driver has been configured via. epcaconfig */
nbdevs = NBDEVS;
num_cards = NUMCARDS;
memcpy((void *)&boards, (void *)&static_boards,
(sizeof(struct board_info) * NUMCARDS));
} /* End driver has been configured via. epcaconfig */
/* -----------------------------------------------------------------
Note : If lilo was used to configure the driver and the
ignore epcaconfig option was choosen (digiepca=2) then
nbdevs and num_cards will equal 0 at this point. This is
okay; PCI cards will still be picked up if detected.
--------------------------------------------------------------------- */
/* -----------------------------------------------------------
Set up interrupt, we will worry about memory allocation in
post_fep_init.
--------------------------------------------------------------- */
printk(KERN_INFO "DIGI epca driver version %s loaded.\n",VERSION);
#ifdef ENABLE_PCI
/* ------------------------------------------------------------------
NOTE : This code assumes that the number of ports found in
the boards array is correct. This could be wrong if
the card in question is PCI (And therefore has no ports
entry in the boards structure.) The rest of the
information will be valid for PCI because the beginning
of pc_init scans for PCI and determines i/o and base
memory addresses. I am not sure if it is possible to
read the number of ports supported by the card prior to
it being booted (Since that is the state it is in when
pc_init is run). Because it is not possible to query the
number of supported ports until after the card has booted;
we are required to calculate the card_ptrs as the card is
is initialized (Inside post_fep_init). The negative thing
about this approach is that digiDload's call to GET_INFO
will have a bad port value. (Since this is called prior
to post_fep_init.)
--------------------------------------------------------------------- */
pci_boards_found = 0;
if(num_cards < MAXBOARDS)
pci_boards_found += init_PCI();
num_cards += pci_boards_found;
#endif /* ENABLE_PCI */
pc_driver->owner = THIS_MODULE;
pc_driver->name = "ttyD";
pc_driver->devfs_name = "tts/D";
pc_driver->major = DIGI_MAJOR;
pc_driver->minor_start = 0;
pc_driver->type = TTY_DRIVER_TYPE_SERIAL;
pc_driver->subtype = SERIAL_TYPE_NORMAL;
pc_driver->init_termios = tty_std_termios;
pc_driver->init_termios.c_iflag = 0;
pc_driver->init_termios.c_oflag = 0;
pc_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | CLOCAL | HUPCL;
pc_driver->init_termios.c_lflag = 0;
pc_driver->flags = TTY_DRIVER_REAL_RAW;
tty_set_operations(pc_driver, &pc_ops);
pc_info->owner = THIS_MODULE;
pc_info->name = "digi_ctl";
pc_info->major = DIGIINFOMAJOR;
pc_info->minor_start = 0;
pc_info->type = TTY_DRIVER_TYPE_SERIAL;
pc_info->subtype = SERIAL_TYPE_INFO;
pc_info->init_termios = tty_std_termios;
pc_info->init_termios.c_iflag = 0;
pc_info->init_termios.c_oflag = 0;
pc_info->init_termios.c_lflag = 0;
pc_info->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL;
pc_info->flags = TTY_DRIVER_REAL_RAW;
tty_set_operations(pc_info, &info_ops);
save_flags(flags);
cli();
for (crd = 0; crd < num_cards; crd++)
{ /* Begin for each card */
/* ------------------------------------------------------------------
This is where the appropriate memory handlers for the hardware is
set. Everything at runtime blindly jumps through these vectors.
---------------------------------------------------------------------- */
/* defined in epcaconfig.h */
bd = &boards[crd];
switch (bd->type)
{ /* Begin switch on bd->type {board type} */
case PCXEM:
case EISAXEM:
bd->memwinon = pcxem_memwinon ;
bd->memwinoff = pcxem_memwinoff ;
bd->globalwinon = pcxem_globalwinon ;
bd->txwinon = pcxem_txwinon ;
bd->rxwinon = pcxem_rxwinon ;
bd->memoff = pcxem_memoff ;
bd->assertgwinon = dummy_assertgwinon;
bd->assertmemoff = dummy_assertmemoff;
break;
case PCIXEM:
case PCIXRJ:
case PCIXR:
bd->memwinon = dummy_memwinon;
bd->memwinoff = dummy_memwinoff;
bd->globalwinon = dummy_globalwinon;
bd->txwinon = dummy_txwinon;
bd->rxwinon = dummy_rxwinon;
bd->memoff = dummy_memoff;
bd->assertgwinon = dummy_assertgwinon;
bd->assertmemoff = dummy_assertmemoff;
break;
case PCXE:
case PCXEVE:
bd->memwinon = pcxe_memwinon;
bd->memwinoff = pcxe_memwinoff;
bd->globalwinon = pcxe_globalwinon;
bd->txwinon = pcxe_txwinon;
bd->rxwinon = pcxe_rxwinon;
bd->memoff = pcxe_memoff;
bd->assertgwinon = dummy_assertgwinon;
bd->assertmemoff = dummy_assertmemoff;
break;
case PCXI:
case PC64XE:
bd->memwinon = pcxi_memwinon;
bd->memwinoff = pcxi_memwinoff;
bd->globalwinon = pcxi_globalwinon;
bd->txwinon = pcxi_txwinon;
bd->rxwinon = pcxi_rxwinon;
bd->memoff = pcxi_memoff;
bd->assertgwinon = pcxi_assertgwinon;
bd->assertmemoff = pcxi_assertmemoff;
break;
default:
break;
} /* End switch on bd->type */
/* ---------------------------------------------------------------
Some cards need a memory segment to be defined for use in
transmit and receive windowing operations. These boards
are listed in the below switch. In the case of the XI the
amount of memory on the board is variable so the memory_seg
is also variable. This code determines what they segment
should be.
----------------------------------------------------------------- */
switch (bd->type)
{ /* Begin switch on bd->type {board type} */
case PCXE:
case PCXEVE:
case PC64XE:
bd->memory_seg = 0xf000;
break;
case PCXI:
board_id = inb((int)bd->port);
if ((board_id & 0x1) == 0x1)
{ /* Begin it's an XI card */
/* Is it a 64K board */
if ((board_id & 0x30) == 0)
bd->memory_seg = 0xf000;
/* Is it a 128K board */
if ((board_id & 0x30) == 0x10)
bd->memory_seg = 0xe000;
/* Is is a 256K board */
if ((board_id & 0x30) == 0x20)
bd->memory_seg = 0xc000;
/* Is it a 512K board */
if ((board_id & 0x30) == 0x30)
bd->memory_seg = 0x8000;
} /* End it is an XI card */
else
{
printk(KERN_ERR "<Error> - Board at 0x%x doesn't appear to be an XI\n",(int)bd->port);
}
break;
} /* End switch on bd->type */
} /* End for each card */
if (tty_register_driver(pc_driver))
panic("Couldn't register Digi PC/ driver");
if (tty_register_driver(pc_info))
panic("Couldn't register Digi PC/ info ");
/* -------------------------------------------------------------------
Start up the poller to check for events on all enabled boards
---------------------------------------------------------------------- */
init_timer(&epca_timer);
epca_timer.function = epcapoll;
mod_timer(&epca_timer, jiffies + HZ/25);
restore_flags(flags);
return 0;
} /* End pc_init */
/* ------------------ Begin post_fep_init ---------------------- */
static void post_fep_init(unsigned int crd)
{ /* Begin post_fep_init */
int i;
unchar *memaddr;
volatile struct global_data *gd;
struct board_info *bd;
volatile struct board_chan *bc;
struct channel *ch;
int shrinkmem = 0, lowwater ;
/* -------------------------------------------------------------
This call is made by the user via. the ioctl call DIGI_INIT.
It is responsible for setting up all the card specific stuff.
---------------------------------------------------------------- */
bd = &boards[crd];
/* -----------------------------------------------------------------
If this is a PCI board, get the port info. Remember PCI cards
do not have entries into the epcaconfig.h file, so we can't get
the number of ports from it. Unfortunetly, this means that anyone
doing a DIGI_GETINFO before the board has booted will get an invalid
number of ports returned (It should return 0). Calls to DIGI_GETINFO
after DIGI_INIT has been called will return the proper values.
------------------------------------------------------------------- */
if (bd->type >= PCIXEM) /* If the board in question is PCI */
{ /* Begin get PCI number of ports */
/* --------------------------------------------------------------------
Below we use XEMPORTS as a memory offset regardless of which PCI
card it is. This is because all of the supported PCI cards have
the same memory offset for the channel data. This will have to be
changed if we ever develop a PCI/XE card. NOTE : The FEP manual
states that the port offset is 0xC22 as opposed to 0xC02. This is
only true for PC/XE, and PC/XI cards; not for the XEM, or CX series.
On the PCI cards the number of ports is determined by reading a
ID PROM located in the box attached to the card. The card can then
determine the index the id to determine the number of ports available.
(FYI - The id should be located at 0x1ac (And may use up to 4 bytes
if the box in question is a XEM or CX)).
------------------------------------------------------------------------ */
bd->numports = (unsigned short)*(unsigned char *)bus_to_virt((unsigned long)
(bd->re_map_membase + XEMPORTS));
epcaassert(bd->numports <= 64,"PCI returned a invalid number of ports");
nbdevs += (bd->numports);
} /* End get PCI number of ports */
if (crd != 0)
card_ptr[crd] = card_ptr[crd-1] + boards[crd-1].numports;
else
card_ptr[crd] = &digi_channels[crd]; /* <- For card 0 only */
ch = card_ptr[crd];
epcaassert(ch <= &digi_channels[nbdevs - 1], "ch out of range");
memaddr = (unchar *)bd->re_map_membase;
/*
The below command is necessary because newer kernels (2.1.x and
up) do not have a 1:1 virtual to physical mapping. The below
call adjust for that.
*/
memaddr = (unsigned char *)bus_to_virt((unsigned long)memaddr);
/* -----------------------------------------------------------------
The below assignment will set bc to point at the BEGINING of
the cards channel structures. For 1 card there will be between
8 and 64 of these structures.
-------------------------------------------------------------------- */
bc = (volatile struct board_chan *)((ulong)memaddr + CHANSTRUCT);
/* -------------------------------------------------------------------
The below assignment will set gd to point at the BEGINING of
global memory address 0xc00. The first data in that global
memory actually starts at address 0xc1a. The command in
pointer begins at 0xd10.
---------------------------------------------------------------------- */
gd = (volatile struct global_data *)((ulong)memaddr + GLOBAL);
/* --------------------------------------------------------------------
XEPORTS (address 0xc22) points at the number of channels the
card supports. (For 64XE, XI, XEM, and XR use 0xc02)
----------------------------------------------------------------------- */
if (((bd->type == PCXEVE) | (bd->type == PCXE)) &&
(*(ushort *)((ulong)memaddr + XEPORTS) < 3))
shrinkmem = 1;
if (bd->type < PCIXEM)
if (!request_region((int)bd->port, 4, board_desc[bd->type]))
return;
memwinon(bd, 0);
/* --------------------------------------------------------------------
Remember ch is the main drivers channels structure, while bc is
the cards channel structure.
------------------------------------------------------------------------ */
/* For every port on the card do ..... */
for (i = 0; i < bd->numports; i++, ch++, bc++)
{ /* Begin for each port */
ch->brdchan = bc;
ch->mailbox = gd;
INIT_WORK(&ch->tqueue, do_softint, ch);
ch->board = &boards[crd];
switch (bd->type)
{ /* Begin switch bd->type */
/* ----------------------------------------------------------------
Since some of the boards use different bitmaps for their
control signals we cannot hard code these values and retain
portability. We virtualize this data here.
------------------------------------------------------------------- */
case EISAXEM:
case PCXEM:
case PCIXEM:
case PCIXRJ:
case PCIXR:
ch->m_rts = 0x02 ;
ch->m_dcd = 0x80 ;
ch->m_dsr = 0x20 ;
ch->m_cts = 0x10 ;
ch->m_ri = 0x40 ;
ch->m_dtr = 0x01 ;
break;
case PCXE:
case PCXEVE:
case PCXI:
case PC64XE:
ch->m_rts = 0x02 ;
ch->m_dcd = 0x08 ;
ch->m_dsr = 0x10 ;
ch->m_cts = 0x20 ;
ch->m_ri = 0x40 ;
ch->m_dtr = 0x80 ;
break;
} /* End switch bd->type */
if (boards[crd].altpin)
{
ch->dsr = ch->m_dcd;
ch->dcd = ch->m_dsr;
ch->digiext.digi_flags |= DIGI_ALTPIN;
}
else
{
ch->dcd = ch->m_dcd;
ch->dsr = ch->m_dsr;
}
ch->boardnum = crd;
ch->channelnum = i;
ch->magic = EPCA_MAGIC;
ch->tty = NULL;
if (shrinkmem)
{
fepcmd(ch, SETBUFFER, 32, 0, 0, 0);
shrinkmem = 0;
}
switch (bd->type)
{ /* Begin switch bd->type */
case PCIXEM:
case PCIXRJ:
case PCIXR:
/* Cover all the 2MEG cards */
ch->txptr = memaddr + (((bc->tseg) << 4) & 0x1fffff);
ch->rxptr = memaddr + (((bc->rseg) << 4) & 0x1fffff);
ch->txwin = FEPWIN | ((bc->tseg) >> 11);
ch->rxwin = FEPWIN | ((bc->rseg) >> 11);
break;
case PCXEM:
case EISAXEM:
/* Cover all the 32K windowed cards */
/* Mask equal to window size - 1 */
ch->txptr = memaddr + (((bc->tseg) << 4) & 0x7fff);
ch->rxptr = memaddr + (((bc->rseg) << 4) & 0x7fff);
ch->txwin = FEPWIN | ((bc->tseg) >> 11);
ch->rxwin = FEPWIN | ((bc->rseg) >> 11);
break;
case PCXEVE:
case PCXE:
ch->txptr = memaddr + (((bc->tseg - bd->memory_seg) << 4) & 0x1fff);
ch->txwin = FEPWIN | ((bc->tseg - bd->memory_seg) >> 9);
ch->rxptr = memaddr + (((bc->rseg - bd->memory_seg) << 4) & 0x1fff);
ch->rxwin = FEPWIN | ((bc->rseg - bd->memory_seg) >>9 );
break;
case PCXI:
case PC64XE:
ch->txptr = memaddr + ((bc->tseg - bd->memory_seg) << 4);
ch->rxptr = memaddr + ((bc->rseg - bd->memory_seg) << 4);
ch->txwin = ch->rxwin = 0;
break;
} /* End switch bd->type */
ch->txbufhead = 0;
ch->txbufsize = bc->tmax + 1;
ch->rxbufhead = 0;
ch->rxbufsize = bc->rmax + 1;
lowwater = ch->txbufsize >= 2000 ? 1024 : (ch->txbufsize / 2);
/* Set transmitter low water mark */
fepcmd(ch, STXLWATER, lowwater, 0, 10, 0);
/* Set receiver low water mark */
fepcmd(ch, SRXLWATER, (ch->rxbufsize / 4), 0, 10, 0);
/* Set receiver high water mark */
fepcmd(ch, SRXHWATER, (3 * ch->rxbufsize / 4), 0, 10, 0);
bc->edelay = 100;
bc->idata = 1;
ch->startc = bc->startc;
ch->stopc = bc->stopc;
ch->startca = bc->startca;
ch->stopca = bc->stopca;
ch->fepcflag = 0;
ch->fepiflag = 0;
ch->fepoflag = 0;
ch->fepstartc = 0;
ch->fepstopc = 0;
ch->fepstartca = 0;
ch->fepstopca = 0;
ch->close_delay = 50;
ch->count = 0;
ch->blocked_open = 0;
init_waitqueue_head(&ch->open_wait);
init_waitqueue_head(&ch->close_wait);
ch->tmp_buf = kmalloc(ch->txbufsize,GFP_KERNEL);
if (!(ch->tmp_buf))
{
printk(KERN_ERR "POST FEP INIT : kmalloc failed for port 0x%x\n",i);
release_region((int)bd->port, 4);
while(i-- > 0)
kfree((ch--)->tmp_buf);
return;
}
else
memset((void *)ch->tmp_buf,0,ch->txbufsize);
} /* End for each port */
printk(KERN_INFO
"Digi PC/Xx Driver V%s: %s I/O = 0x%lx Mem = 0x%lx Ports = %d\n",
VERSION, board_desc[bd->type], (long)bd->port, (long)bd->membase, bd->numports);
sprintf(mesg,
"Digi PC/Xx Driver V%s: %s I/O = 0x%lx Mem = 0x%lx Ports = %d\n",
VERSION, board_desc[bd->type], (long)bd->port, (long)bd->membase, bd->numports);
console_print(mesg);
memwinoff(bd, 0);
} /* End post_fep_init */
/* --------------------- Begin epcapoll ------------------------ */
static void epcapoll(unsigned long ignored)
{ /* Begin epcapoll */
unsigned long flags;
int crd;
volatile unsigned int head, tail;
struct channel *ch;
struct board_info *bd;
/* -------------------------------------------------------------------
This routine is called upon every timer interrupt. Even though
the Digi series cards are capable of generating interrupts this
method of non-looping polling is more efficient. This routine
checks for card generated events (Such as receive data, are transmit
buffer empty) and acts on those events.
----------------------------------------------------------------------- */
save_flags(flags);
cli();
for (crd = 0; crd < num_cards; crd++)
{ /* Begin for each card */
bd = &boards[crd];
ch = card_ptr[crd];
if ((bd->status == DISABLED) || digi_poller_inhibited)
continue; /* Begin loop next interation */
/* -----------------------------------------------------------
assertmemoff is not needed here; indeed it is an empty subroutine.
It is being kept because future boards may need this as well as
some legacy boards.
---------------------------------------------------------------- */
assertmemoff(ch);
globalwinon(ch);
/* ---------------------------------------------------------------
In this case head and tail actually refer to the event queue not
the transmit or receive queue.
------------------------------------------------------------------- */
head = ch->mailbox->ein;
tail = ch->mailbox->eout;
/* If head isn't equal to tail we have an event */
if (head != tail)
doevent(crd);
memoff(ch);
} /* End for each card */
mod_timer(&epca_timer, jiffies + (HZ / 25));
restore_flags(flags);
} /* End epcapoll */
/* --------------------- Begin doevent ------------------------ */
static void doevent(int crd)
{ /* Begin doevent */
volatile unchar *eventbuf;
struct channel *ch, *chan0;
static struct tty_struct *tty;
volatile struct board_info *bd;
volatile struct board_chan *bc;
register volatile unsigned int tail, head;
register int event, channel;
register int mstat, lstat;
/* -------------------------------------------------------------------
This subroutine is called by epcapoll when an event is detected
in the event queue. This routine responds to those events.
--------------------------------------------------------------------- */
bd = &boards[crd];
chan0 = card_ptr[crd];
epcaassert(chan0 <= &digi_channels[nbdevs - 1], "ch out of range");
assertgwinon(chan0);
while ((tail = chan0->mailbox->eout) != (head = chan0->mailbox->ein))
{ /* Begin while something in event queue */
assertgwinon(chan0);
eventbuf = (volatile unchar *)bus_to_virt((ulong)(bd->re_map_membase + tail + ISTART));
/* Get the channel the event occurred on */
channel = eventbuf[0];
/* Get the actual event code that occurred */
event = eventbuf[1];
/* ----------------------------------------------------------------
The two assignments below get the current modem status (mstat)
and the previous modem status (lstat). These are useful becuase
an event could signal a change in modem signals itself.
------------------------------------------------------------------- */
mstat = eventbuf[2];
lstat = eventbuf[3];
ch = chan0 + channel;
if ((unsigned)channel >= bd->numports || !ch)
{
if (channel >= bd->numports)
ch = chan0;
bc = ch->brdchan;
goto next;
}
if ((bc = ch->brdchan) == NULL)
goto next;
if (event & DATA_IND)
{ /* Begin DATA_IND */
receive_data(ch);
assertgwinon(ch);
} /* End DATA_IND */
/* else *//* Fix for DCD transition missed bug */
if (event & MODEMCHG_IND)
{ /* Begin MODEMCHG_IND */
/* A modem signal change has been indicated */
ch->imodem = mstat;
if (ch->asyncflags & ASYNC_CHECK_CD)
{
if (mstat & ch->dcd) /* We are now receiving dcd */
wake_up_interruptible(&ch->open_wait);
else
pc_sched_event(ch, EPCA_EVENT_HANGUP); /* No dcd; hangup */
}
} /* End MODEMCHG_IND */
tty = ch->tty;
if (tty)
{ /* Begin if valid tty */
if (event & BREAK_IND)
{ /* Begin if BREAK_IND */
/* A break has been indicated */
tty->flip.count++;
*tty->flip.flag_buf_ptr++ = TTY_BREAK;
*tty->flip.char_buf_ptr++ = 0;
tty_schedule_flip(tty);
} /* End if BREAK_IND */
else
if (event & LOWTX_IND)
{ /* Begin LOWTX_IND */
if (ch->statusflags & LOWWAIT)
{ /* Begin if LOWWAIT */
ch->statusflags &= ~LOWWAIT;
tty_wakeup(tty);
wake_up_interruptible(&tty->write_wait);
} /* End if LOWWAIT */
} /* End LOWTX_IND */
else
if (event & EMPTYTX_IND)
{ /* Begin EMPTYTX_IND */
/* This event is generated by setup_empty_event */
ch->statusflags &= ~TXBUSY;
if (ch->statusflags & EMPTYWAIT)
{ /* Begin if EMPTYWAIT */
ch->statusflags &= ~EMPTYWAIT;
tty_wakeup(tty);
wake_up_interruptible(&tty->write_wait);
} /* End if EMPTYWAIT */
} /* End EMPTYTX_IND */
} /* End if valid tty */
next:
globalwinon(ch);
if (!bc)
printk(KERN_ERR "<Error> - bc == NULL in doevent!\n");
else
bc->idata = 1;
chan0->mailbox->eout = (tail + 4) & (IMAX - ISTART - 4);
globalwinon(chan0);
} /* End while something in event queue */
} /* End doevent */
/* --------------------- Begin fepcmd ------------------------ */
static void fepcmd(struct channel *ch, int cmd, int word_or_byte,
int byte2, int ncmds, int bytecmd)
{ /* Begin fepcmd */
unchar *memaddr;
unsigned int head, cmdTail, cmdStart, cmdMax;
long count;
int n;
/* This is the routine in which commands may be passed to the card. */
if (ch->board->status == DISABLED)
{
return;
}
assertgwinon(ch);
/* Remember head (As well as max) is just an offset not a base addr */
head = ch->mailbox->cin;
/* cmdStart is a base address */
cmdStart = ch->mailbox->cstart;
/* ------------------------------------------------------------------
We do the addition below because we do not want a max pointer
relative to cmdStart. We want a max pointer that points at the
physical end of the command queue.
-------------------------------------------------------------------- */
cmdMax = (cmdStart + 4 + (ch->mailbox->cmax));
memaddr = ch->board->re_map_membase;
/*
The below command is necessary because newer kernels (2.1.x and
up) do not have a 1:1 virtual to physical mapping. The below
call adjust for that.
*/
memaddr = (unsigned char *)bus_to_virt((unsigned long)memaddr);
if (head >= (cmdMax - cmdStart) || (head & 03))
{
printk(KERN_ERR "line %d: Out of range, cmd = %x, head = %x\n", __LINE__,
cmd, head);
printk(KERN_ERR "line %d: Out of range, cmdMax = %x, cmdStart = %x\n", __LINE__,
cmdMax, cmdStart);
return;
}
if (bytecmd)
{
*(volatile unchar *)(memaddr + head + cmdStart + 0) = (unchar)cmd;
*(volatile unchar *)(memaddr + head + cmdStart + 1) = (unchar)ch->channelnum;
/* Below word_or_byte is bits to set */
*(volatile unchar *)(memaddr + head + cmdStart + 2) = (unchar)word_or_byte;
/* Below byte2 is bits to reset */
*(volatile unchar *)(memaddr + head + cmdStart + 3) = (unchar)byte2;
}
else
{
*(volatile unchar *)(memaddr + head + cmdStart + 0) = (unchar)cmd;
*(volatile unchar *)(memaddr + head + cmdStart + 1) = (unchar)ch->channelnum;
*(volatile ushort*)(memaddr + head + cmdStart + 2) = (ushort)word_or_byte;
}
head = (head + 4) & (cmdMax - cmdStart - 4);
ch->mailbox->cin = head;
count = FEPTIMEOUT;
for (;;)
{ /* Begin forever loop */
count--;
if (count == 0)
{
printk(KERN_ERR "<Error> - Fep not responding in fepcmd()\n");
return;
}
head = ch->mailbox->cin;
cmdTail = ch->mailbox->cout;
n = (head - cmdTail) & (cmdMax - cmdStart - 4);
/* ----------------------------------------------------------
Basically this will break when the FEP acknowledges the
command by incrementing cmdTail (Making it equal to head).
------------------------------------------------------------- */
if (n <= ncmds * (sizeof(short) * 4))
break; /* Well nearly forever :-) */
} /* End forever loop */
} /* End fepcmd */
/* ---------------------------------------------------------------------
Digi products use fields in their channels structures that are very
similar to the c_cflag and c_iflag fields typically found in UNIX
termios structures. The below three routines allow mappings
between these hardware "flags" and their respective Linux flags.
------------------------------------------------------------------------- */
/* --------------------- Begin termios2digi_h -------------------- */
static unsigned termios2digi_h(struct channel *ch, unsigned cflag)
{ /* Begin termios2digi_h */
unsigned res = 0;
if (cflag & CRTSCTS)
{
ch->digiext.digi_flags |= (RTSPACE | CTSPACE);
res |= ((ch->m_cts) | (ch->m_rts));
}
if (ch->digiext.digi_flags & RTSPACE)
res |= ch->m_rts;
if (ch->digiext.digi_flags & DTRPACE)
res |= ch->m_dtr;
if (ch->digiext.digi_flags & CTSPACE)
res |= ch->m_cts;
if (ch->digiext.digi_flags & DSRPACE)
res |= ch->dsr;
if (ch->digiext.digi_flags & DCDPACE)
res |= ch->dcd;
if (res & (ch->m_rts))
ch->digiext.digi_flags |= RTSPACE;
if (res & (ch->m_cts))
ch->digiext.digi_flags |= CTSPACE;
return res;
} /* End termios2digi_h */
/* --------------------- Begin termios2digi_i -------------------- */
static unsigned termios2digi_i(struct channel *ch, unsigned iflag)
{ /* Begin termios2digi_i */
unsigned res = iflag & (IGNBRK | BRKINT | IGNPAR | PARMRK |
INPCK | ISTRIP|IXON|IXANY|IXOFF);
if (ch->digiext.digi_flags & DIGI_AIXON)
res |= IAIXON;
return res;
} /* End termios2digi_i */
/* --------------------- Begin termios2digi_c -------------------- */
static unsigned termios2digi_c(struct channel *ch, unsigned cflag)
{ /* Begin termios2digi_c */
unsigned res = 0;
#ifdef SPEED_HACK
/* CL: HACK to force 115200 at 38400 and 57600 at 19200 Baud */
if ((cflag & CBAUD)== B38400) cflag=cflag - B38400 + B115200;
if ((cflag & CBAUD)== B19200) cflag=cflag - B19200 + B57600;
#endif /* SPEED_HACK */
if (cflag & CBAUDEX)
{ /* Begin detected CBAUDEX */
ch->digiext.digi_flags |= DIGI_FAST;
/* -------------------------------------------------------------
HUPCL bit is used by FEP to indicate fast baud
table is to be used.
----------------------------------------------------------------- */
res |= FEP_HUPCL;
} /* End detected CBAUDEX */
else ch->digiext.digi_flags &= ~DIGI_FAST;
/* -------------------------------------------------------------------
CBAUD has bit position 0x1000 set these days to indicate Linux
baud rate remap. Digi hardware can't handle the bit assignment.
(We use a different bit assignment for high speed.). Clear this
bit out.
---------------------------------------------------------------------- */
res |= cflag & ((CBAUD ^ CBAUDEX) | PARODD | PARENB | CSTOPB | CSIZE);
/* -------------------------------------------------------------
This gets a little confusing. The Digi cards have their own
representation of c_cflags controling baud rate. For the most
part this is identical to the Linux implementation. However;
Digi supports one rate (76800) that Linux doesn't. This means
that the c_cflag entry that would normally mean 76800 for Digi
actually means 115200 under Linux. Without the below mapping,
a stty 115200 would only drive the board at 76800. Since
the rate 230400 is also found after 76800, the same problem afflicts
us when we choose a rate of 230400. Without the below modificiation
stty 230400 would actually give us 115200.
There are two additional differences. The Linux value for CLOCAL
(0x800; 0004000) has no meaning to the Digi hardware. Also in
later releases of Linux; the CBAUD define has CBAUDEX (0x1000;
0010000) ored into it (CBAUD = 0x100f as opposed to 0xf). CBAUDEX
should be checked for a screened out prior to termios2digi_c
returning. Since CLOCAL isn't used by the board this can be
ignored as long as the returned value is used only by Digi hardware.
----------------------------------------------------------------- */
if (cflag & CBAUDEX)
{
/* -------------------------------------------------------------
The below code is trying to guarantee that only baud rates
115200 and 230400 are remapped. We use exclusive or because
the various baud rates share common bit positions and therefore
can't be tested for easily.
----------------------------------------------------------------- */
if ((!((cflag & 0x7) ^ (B115200 & ~CBAUDEX))) ||
(!((cflag & 0x7) ^ (B230400 & ~CBAUDEX))))
{
res += 1;
}
}
return res;
} /* End termios2digi_c */
/* --------------------- Begin epcaparam ----------------------- */
static void epcaparam(struct tty_struct *tty, struct channel *ch)
{ /* Begin epcaparam */
unsigned int cmdHead;
struct termios *ts;
volatile struct board_chan *bc;
unsigned mval, hflow, cflag, iflag;
bc = ch->brdchan;
epcaassert(bc !=0, "bc out of range");
assertgwinon(ch);
ts = tty->termios;
if ((ts->c_cflag & CBAUD) == 0)
{ /* Begin CBAUD detected */
cmdHead = bc->rin;
bc->rout = cmdHead;
cmdHead = bc->tin;
/* Changing baud in mid-stream transmission can be wonderful */
/* ---------------------------------------------------------------
Flush current transmit buffer by setting cmdTail pointer (tout)
to cmdHead pointer (tin). Hopefully the transmit buffer is empty.
----------------------------------------------------------------- */
fepcmd(ch, STOUT, (unsigned) cmdHead, 0, 0, 0);
mval = 0;
} /* End CBAUD detected */
else
{ /* Begin CBAUD not detected */
/* -------------------------------------------------------------------
c_cflags have changed but that change had nothing to do with BAUD.
Propagate the change to the card.
---------------------------------------------------------------------- */
cflag = termios2digi_c(ch, ts->c_cflag);
if (cflag != ch->fepcflag)
{
ch->fepcflag = cflag;
/* Set baud rate, char size, stop bits, parity */
fepcmd(ch, SETCTRLFLAGS, (unsigned) cflag, 0, 0, 0);
}
/* ----------------------------------------------------------------
If the user has not forced CLOCAL and if the device is not a
CALLOUT device (Which is always CLOCAL) we set flags such that
the driver will wait on carrier detect.
------------------------------------------------------------------- */
if (ts->c_cflag & CLOCAL)
{ /* Begin it is a cud device or a ttyD device with CLOCAL on */
ch->asyncflags &= ~ASYNC_CHECK_CD;
} /* End it is a cud device or a ttyD device with CLOCAL on */
else
{ /* Begin it is a ttyD device */
ch->asyncflags |= ASYNC_CHECK_CD;
} /* End it is a ttyD device */
mval = ch->m_dtr | ch->m_rts;
} /* End CBAUD not detected */
iflag = termios2digi_i(ch, ts->c_iflag);
/* Check input mode flags */
if (iflag != ch->fepiflag)
{
ch->fepiflag = iflag;
/* ---------------------------------------------------------------
Command sets channels iflag structure on the board. Such things
as input soft flow control, handling of parity errors, and
break handling are all set here.
------------------------------------------------------------------- */
/* break handling, parity handling, input stripping, flow control chars */
fepcmd(ch, SETIFLAGS, (unsigned int) ch->fepiflag, 0, 0, 0);
}
/* ---------------------------------------------------------------
Set the board mint value for this channel. This will cause hardware
events to be generated each time the DCD signal (Described in mint)
changes.
------------------------------------------------------------------- */
bc->mint = ch->dcd;
if ((ts->c_cflag & CLOCAL) || (ch->digiext.digi_flags & DIGI_FORCEDCD))
if (ch->digiext.digi_flags & DIGI_FORCEDCD)
bc->mint = 0;
ch->imodem = bc->mstat;
hflow = termios2digi_h(ch, ts->c_cflag);
if (hflow != ch->hflow)
{
ch->hflow = hflow;
/* --------------------------------------------------------------
Hard flow control has been selected but the board is not
using it. Activate hard flow control now.
----------------------------------------------------------------- */
fepcmd(ch, SETHFLOW, hflow, 0xff, 0, 1);
}
mval ^= ch->modemfake & (mval ^ ch->modem);
if (ch->omodem ^ mval)
{
ch->omodem = mval;
/* --------------------------------------------------------------
The below command sets the DTR and RTS mstat structure. If
hard flow control is NOT active these changes will drive the
output of the actual DTR and RTS lines. If hard flow control
is active, the changes will be saved in the mstat structure and
only asserted when hard flow control is turned off.
----------------------------------------------------------------- */
/* First reset DTR & RTS; then set them */
fepcmd(ch, SETMODEM, 0, ((ch->m_dtr)|(ch->m_rts)), 0, 1);
fepcmd(ch, SETMODEM, mval, 0, 0, 1);
}
if (ch->startc != ch->fepstartc || ch->stopc != ch->fepstopc)
{
ch->fepstartc = ch->startc;
ch->fepstopc = ch->stopc;
/* ------------------------------------------------------------
The XON / XOFF characters have changed; propagate these
changes to the card.
--------------------------------------------------------------- */
fepcmd(ch, SONOFFC, ch->fepstartc, ch->fepstopc, 0, 1);
}
if (ch->startca != ch->fepstartca || ch->stopca != ch->fepstopca)
{
ch->fepstartca = ch->startca;
ch->fepstopca = ch->stopca;
/* ---------------------------------------------------------------
Similar to the above, this time the auxilarly XON / XOFF
characters have changed; propagate these changes to the card.
------------------------------------------------------------------ */
fepcmd(ch, SAUXONOFFC, ch->fepstartca, ch->fepstopca, 0, 1);
}
} /* End epcaparam */
/* --------------------- Begin receive_data ----------------------- */
static void receive_data(struct channel *ch)
{ /* Begin receive_data */
unchar *rptr;
struct termios *ts = NULL;
struct tty_struct *tty;
volatile struct board_chan *bc;
register int dataToRead, wrapgap, bytesAvailable;
register unsigned int tail, head;
unsigned int wrapmask;
int rc;
/* ---------------------------------------------------------------
This routine is called by doint when a receive data event
has taken place.
------------------------------------------------------------------- */
globalwinon(ch);
if (ch->statusflags & RXSTOPPED)
return;
tty = ch->tty;
if (tty)
ts = tty->termios;
bc = ch->brdchan;
if (!bc)
{
printk(KERN_ERR "<Error> - bc is NULL in receive_data!\n");
return;
}
wrapmask = ch->rxbufsize - 1;
/* ---------------------------------------------------------------------
Get the head and tail pointers to the receiver queue. Wrap the
head pointer if it has reached the end of the buffer.
------------------------------------------------------------------------ */
head = bc->rin;
head &= wrapmask;
tail = bc->rout & wrapmask;
bytesAvailable = (head - tail) & wrapmask;
if (bytesAvailable == 0)
return;
/* ------------------------------------------------------------------
If CREAD bit is off or device not open, set TX tail to head
--------------------------------------------------------------------- */
if (!tty || !ts || !(ts->c_cflag & CREAD))
{
bc->rout = head;
return;
}
if (tty->flip.count == TTY_FLIPBUF_SIZE)
return;
if (bc->orun)
{
bc->orun = 0;
printk(KERN_WARNING "overrun! DigiBoard device %s\n",tty->name);
}
rxwinon(ch);
rptr = tty->flip.char_buf_ptr;
rc = tty->flip.count;
while (bytesAvailable > 0)
{ /* Begin while there is data on the card */
wrapgap = (head >= tail) ? head - tail : ch->rxbufsize - tail;
/* ---------------------------------------------------------------
Even if head has wrapped around only report the amount of
data to be equal to the size - tail. Remember memcpy can't
automaticly wrap around the receive buffer.
----------------------------------------------------------------- */
dataToRead = (wrapgap < bytesAvailable) ? wrapgap : bytesAvailable;
/* --------------------------------------------------------------
Make sure we don't overflow the buffer
----------------------------------------------------------------- */
if ((rc + dataToRead) > TTY_FLIPBUF_SIZE)
dataToRead = TTY_FLIPBUF_SIZE - rc;
if (dataToRead == 0)
break;
/* ---------------------------------------------------------------
Move data read from our card into the line disciplines buffer
for translation if necessary.
------------------------------------------------------------------ */
if ((memcpy(rptr, ch->rxptr + tail, dataToRead)) != rptr)
printk(KERN_ERR "<Error> - receive_data : memcpy failed\n");
rc += dataToRead;
rptr += dataToRead;
tail = (tail + dataToRead) & wrapmask;
bytesAvailable -= dataToRead;
} /* End while there is data on the card */
tty->flip.count = rc;
tty->flip.char_buf_ptr = rptr;
globalwinon(ch);
bc->rout = tail;
/* Must be called with global data */
tty_schedule_flip(ch->tty);
return;
} /* End receive_data */
static int info_ioctl(struct tty_struct *tty, struct file * file,
unsigned int cmd, unsigned long arg)
{
switch (cmd)
{ /* Begin switch cmd */
case DIGI_GETINFO:
{ /* Begin case DIGI_GETINFO */
struct digi_info di ;
int brd;
getUser(brd, (unsigned int __user *)arg);
if ((brd < 0) || (brd >= num_cards) || (num_cards == 0))
return (-ENODEV);
memset(&di, 0, sizeof(di));
di.board = brd ;
di.status = boards[brd].status;
di.type = boards[brd].type ;
di.numports = boards[brd].numports ;
di.port = boards[brd].port ;
di.membase = boards[brd].membase ;
if (copy_to_user((void __user *)arg, &di, sizeof (di)))
return -EFAULT;
break;
} /* End case DIGI_GETINFO */
case DIGI_POLLER:
{ /* Begin case DIGI_POLLER */
int brd = arg & 0xff000000 >> 16 ;
unsigned char state = arg & 0xff ;
if ((brd < 0) || (brd >= num_cards))
{
printk(KERN_ERR "<Error> - DIGI POLLER : brd not valid!\n");
return (-ENODEV);
}
digi_poller_inhibited = state ;
break ;
} /* End case DIGI_POLLER */
case DIGI_INIT:
{ /* Begin case DIGI_INIT */
/* ------------------------------------------------------------
This call is made by the apps to complete the initilization
of the board(s). This routine is responsible for setting
the card to its initial state and setting the drivers control
fields to the sutianle settings for the card in question.
---------------------------------------------------------------- */
int crd ;
for (crd = 0; crd < num_cards; crd++)
post_fep_init (crd);
break ;
} /* End case DIGI_INIT */
default:
return -ENOIOCTLCMD;
} /* End switch cmd */
return (0) ;
}
/* --------------------- Begin pc_ioctl ----------------------- */
static int pc_tiocmget(struct tty_struct *tty, struct file *file)
{
struct channel *ch = (struct channel *) tty->driver_data;
volatile struct board_chan *bc;
unsigned int mstat, mflag = 0;
unsigned long flags;
if (ch)
bc = ch->brdchan;
else
{
printk(KERN_ERR "<Error> - ch is NULL in pc_tiocmget!\n");
return(-EINVAL);
}
save_flags(flags);
cli();
globalwinon(ch);
mstat = bc->mstat;
memoff(ch);
restore_flags(flags);
if (mstat & ch->m_dtr)
mflag |= TIOCM_DTR;
if (mstat & ch->m_rts)
mflag |= TIOCM_RTS;
if (mstat & ch->m_cts)
mflag |= TIOCM_CTS;
if (mstat & ch->dsr)
mflag |= TIOCM_DSR;
if (mstat & ch->m_ri)
mflag |= TIOCM_RI;
if (mstat & ch->dcd)
mflag |= TIOCM_CD;
return mflag;
}
static int pc_tiocmset(struct tty_struct *tty, struct file *file,
unsigned int set, unsigned int clear)
{
struct channel *ch = (struct channel *) tty->driver_data;
unsigned long flags;
if (!ch) {
printk(KERN_ERR "<Error> - ch is NULL in pc_tiocmset!\n");
return(-EINVAL);
}
save_flags(flags);
cli();
/*
* I think this modemfake stuff is broken. It doesn't
* correctly reflect the behaviour desired by the TIOCM*
* ioctls. Therefore this is probably broken.
*/
if (set & TIOCM_RTS) {
ch->modemfake |= ch->m_rts;
ch->modem |= ch->m_rts;
}
if (set & TIOCM_DTR) {
ch->modemfake |= ch->m_dtr;
ch->modem |= ch->m_dtr;
}
if (clear & TIOCM_RTS) {
ch->modemfake |= ch->m_rts;
ch->modem &= ~ch->m_rts;
}
if (clear & TIOCM_DTR) {
ch->modemfake |= ch->m_dtr;
ch->modem &= ~ch->m_dtr;
}
globalwinon(ch);
/* --------------------------------------------------------------
The below routine generally sets up parity, baud, flow control
issues, etc.... It effect both control flags and input flags.
------------------------------------------------------------------ */
epcaparam(tty,ch);
memoff(ch);
restore_flags(flags);
return 0;
}
static int pc_ioctl(struct tty_struct *tty, struct file * file,
unsigned int cmd, unsigned long arg)
{ /* Begin pc_ioctl */
digiflow_t dflow;
int retval;
unsigned long flags;
unsigned int mflag, mstat;
unsigned char startc, stopc;
volatile struct board_chan *bc;
struct channel *ch = (struct channel *) tty->driver_data;
void __user *argp = (void __user *)arg;
if (ch)
bc = ch->brdchan;
else
{
printk(KERN_ERR "<Error> - ch is NULL in pc_ioctl!\n");
return(-EINVAL);
}
save_flags(flags);
/* -------------------------------------------------------------------
For POSIX compliance we need to add more ioctls. See tty_ioctl.c
in /usr/src/linux/drivers/char for a good example. In particular
think about adding TCSETAF, TCSETAW, TCSETA, TCSETSF, TCSETSW, TCSETS.
---------------------------------------------------------------------- */
switch (cmd)
{ /* Begin switch cmd */
case TCGETS:
if (copy_to_user(argp,
tty->termios, sizeof(struct termios)))
return -EFAULT;
return(0);
case TCGETA:
return get_termio(tty, argp);
case TCSBRK: /* SVID version: non-zero arg --> no break */
retval = tty_check_change(tty);
if (retval)
return retval;
/* Setup an event to indicate when the transmit buffer empties */
setup_empty_event(tty,ch);
tty_wait_until_sent(tty, 0);
if (!arg)
digi_send_break(ch, HZ/4); /* 1/4 second */
return 0;
case TCSBRKP: /* support for POSIX tcsendbreak() */
retval = tty_check_change(tty);
if (retval)
return retval;
/*