epca.c
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- /*
-
- 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 <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 *)arg2)
- #define getUser(arg1, arg2) get_user(arg1, (unsigned int *)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 MIN(a,b) ((a) < (b) ? (a) : (b))
- #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 pc_refcount, 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 ---------- */
- struct tty_driver pc_driver;
- struct tty_driver pc_callout;
- struct tty_driver pc_info;
- /* The below structures are used to initialize the tty_driver structures. */
- /* -------------------------------------------------------------------------
- Note : MAX_ALLOC is currently limited to 0x100. This restriction is
- placed on us by Linux not Digi.
- ----------------------------------------------------------------------------*/
- static struct tty_struct *pc_table[MAX_ALLOC];
- static struct termios *pc_termios[MAX_ALLOC];
- static struct termios *pc_termios_locked[MAX_ALLOC];
- /* ------------------ 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.
- ----------------------------------------------------------------------- */
-
- #ifdef MODULE
- int init_module(void);
- void cleanup_module(void);
- #endif /* MODULE */
- 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 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 *);
- static int pc_write(struct tty_struct *, int, 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;
- MOD_INC_USE_COUNT;
- if (schedule_task(&ch->tqueue) == 0)
- MOD_DEC_USE_COUNT;
- } /* 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 %sn",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;
- if (tty->driver.subtype == SERIAL_TYPE_INFO)
- {
- return;
- }
- /* ---------------------------------------------------------
- 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;
-
- /* -------------------------------------------------------------
- Save the termios structure, since this port may have
- separate termios for callout and dialin.
- --------------------------------------------------------------- */
- if (ch->asyncflags & ASYNC_NORMAL_ACTIVE)
- ch->normal_termios = *tty->termios;
- if (ch->asyncflags & ASYNC_CALLOUT_ACTIVE)
- ch->callout_termios = *tty->termios;
- 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);
- if (tty->ldisc.flush_buffer)
- tty->ldisc.flush_buffer(tty);
- shutdown(ch);
- tty->closing = 0;
- ch->event = 0;
- ch->tty = NULL;
- if (ch->blocked_open)
- { /* Begin if blocked_open */
- if (ch->close_delay)
- {
- current->state = TASK_INTERRUPTIBLE;
- schedule_timeout(ch->close_delay);
- }
- wake_up_interruptible(&ch->open_wait);
- } /* End if blocked_open */
- ch->asyncflags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_INITIALIZED |
- ASYNC_CALLOUT_ACTIVE | ASYNC_CLOSING);
- wake_up_interruptible(&ch->close_wait);
- MOD_DEC_USE_COUNT;
- 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);
- if (tty->ldisc.flush_buffer)
- tty->ldisc.flush_buffer(tty);
- shutdown(ch);
- if (ch->count)
- MOD_DEC_USE_COUNT;
-
- ch->tty = NULL;
- ch->event = 0;
- ch->count = 0;
- restore_flags(flags);
- ch->asyncflags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_INITIALIZED | ASYNC_CALLOUT_ACTIVE);
- wake_up_interruptible(&ch->open_wait);
- } /* End if ch != NULL */
- } /* End pc_hangup */
- /* ------------------ Begin pc_write ------------------------- */
- static int pc_write(struct tty_struct * tty, int from_user,
- 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.
- ------------------------------------------------------------------- */
- /* Stop users from hurting themselves on control minor */
- if (tty->driver.subtype == SERIAL_TYPE_INFO)
- {
- return (0) ;
- }
- /* ---------------------------------------------------------
- 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;
- if (from_user)
- { /* Begin from_user */
- save_flags(flags);
- cli();
- globalwinon(ch);
- /* -----------------------------------------------------------------
- Anding against size will wrap the pointer back to its beginning
- position if it is necessary. This will only work if size is
- a power of 2 which should always be the case. Size is determined
- by the cards on board FEP/OS.
- -------------------------------------------------------------------- */
- /* head refers to the next empty location in which data may be stored */
- head = bc->tin & (size - 1);
- /* tail refers to the next data byte to be transmitted */
- tail = bc->tout;
- /* Consider changing this to a do statement to make sure */
- if (tail != bc->tout)
- tail = bc->tout;
- /* ------------------------------------------------------------------
- Anding against size will wrap the pointer back to its beginning
- position if it is necessary. This will only work if size is
- a power of 2 which should always be the case. Size is determined
- by the cards on board FEP/OS.
- --------------------------------------------------------------------- */
- tail &= (size - 1);
- /* -----------------------------------------------------------------
- Two situations can affect how space in the transmit buffer
- is calculated. You can have a situation where the transmit
- in pointer (tin) head has wrapped around and actually has a
- lower address than the transmit out pointer (tout) tail; or
- the transmit in pointer (tin) head will not be wrapped around
- yet, and have a higher address than the transmit out pointer
- (tout) tail. Obviously space available in the transmit buffer
- is calculated differently for each case.
- Example 1:
-
- Consider a 10 byte buffer where head is a pointer to the next
- empty location in the buffer and tail is a pointer to the next
- byte to transmit. In this example head will not have wrapped
- around and therefore head > tail.
- 0 1 2 3 4 5 6 7 8 9
- tail head
- The above diagram shows that buffer locations 2,3,4,5 and 6 have
- data to be transmitted, while head points at the next empty
- location. To calculate how much space is available first we have
- to determine if the head pointer (tin) has wrapped. To do this
- compare the head pointer to the tail pointer, If head is equal
- or greater than tail; then it has not wrapped; and the space may
- be calculated by subtracting tail from head and then subtracting
- that value from the buffers size. A one is subtracted from the
- new value to indicate how much space is available between the
- head pointer and end of buffer; as well as the space between the
- beginning of the buffer and the tail. If the head is not greater
- or equal to the tail this indicates that the head has wrapped
- around to the beginning of the buffer. To calculate the space
- available in this case simply subtract head from tail. This new
- value minus one represents the space available betwwen the head
- and tail pointers. In this example head (7) is greater than tail (2)
- and therefore has not wrapped around. We find the space by first
- subtracting tail from head (7-2=5). We then subtract this value
- from the buffer size of ten and subtract one (10-5-1=4). The space
- remaining is 4 bytes.
- Example 2:
-
- Consider a 10 byte buffer where head is a pointer to the next
- empty location in the buffer and tail is a pointer to the next
- byte to transmit. In this example head will wrapped around and
- therefore head < tail.
- 0 1 2 3 4 5 6 7 8 9
- head tail
- The above diagram shows that buffer locations 7,8,9,0 and 1 have
- data to be transmitted, while head points at the next empty
- location. To find the space available we compare head to tail. If
- head is not equal to, or greater than tail this indicates that head
- has wrapped around. In this case head (2) is not equal to, or
- greater than tail (7) and therefore has already wrapped around. To
- calculate the available space between the two pointers we subtract
- head from tail (7-2=5). We then subtract one from this new value
- (5-1=4). We have 5 bytes empty remaining in the buffer. Unlike the
- previous example these five bytes are located between the head and
- tail pointers.
- ----------------------------------------------------------------------- */
- dataLen = (head >= tail) ? (size - (head - tail) - 1) : (tail - head - 1);
- /* ----------------------------------------------------------------------
- In this case bytesAvailable has been passed into pc_write and
- represents the amount of data that needs to be written. dataLen
- represents the amount of space available on the card. Whichever
- value is smaller will be the amount actually written.
- bytesAvailable will then take on this newly calculated value.
- ---------------------------------------------------------------------- */
- bytesAvailable = MIN(dataLen, bytesAvailable);
- /* First we read the data in from the file system into a temp buffer */
- memoff(ch);
- restore_flags(flags);
- if (bytesAvailable)
- { /* Begin bytesAvailable */
- /* Can the user buffer be accessed at the moment ? */
- if (verify_area(VERIFY_READ, (char*)buf, bytesAvailable))
- bytesAvailable = 0; /* Can't do; try again later */
- else /* Evidently it can, began transmission */
- { /* Begin if area verified */
- /* ---------------------------------------------------------------
- The below function reads data from user memory. This routine
- can not be used in an interrupt routine. (Because it may
- generate a page fault) It can only be called while we can the
- user context is accessible.
- The prototype is :
- inline void copy_from_user(void * to, const void * from,
- unsigned long count);
- You must include <asm/segment.h>
- I also think (Check hackers guide) that optimization must
- be turned ON. (Which sounds strange to me...)
-
- Remember copy_from_user WILL generate a page fault if the
- user memory being accessed has been swapped out. This can
- cause this routine to temporarily sleep while this page
- fault is occuring.
-
- ----------------------------------------------------------------- */
- if (copy_from_user(ch->tmp_buf, buf,
- bytesAvailable))
- return -EFAULT;
- } /* End if area verified */
- } /* End bytesAvailable */
- /* ------------------------------------------------------------------
- Set buf to this address for the moment. tmp_buf was allocated in
- post_fep_init.
- --------------------------------------------------------------------- */
- buf = ch->tmp_buf;
- } /* End from_user */
- /* All data is now local */
- 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, 0, &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);
- if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) && tty->ldisc.write_wakeup)
- (tty->ldisc.write_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 this is a callout device, then just make sure the normal
- device isn't being used.
- -------------------------------------------------------------------- */
- if (tty->driver.subtype == SERIAL_TYPE_CALLOUT)
- { /* A cud device has been opened */
- if (ch->asyncflags & ASYNC_NORMAL_ACTIVE)
- return -EBUSY;
- if ((ch->asyncflags & ASYNC_CALLOUT_ACTIVE) &&
- (ch->asyncflags & ASYNC_SESSION_LOCKOUT) &&
- (ch->session != current->session))
- return -EBUSY;
- if ((ch->asyncflags & ASYNC_CALLOUT_ACTIVE) &&
- (ch->asyncflags & ASYNC_PGRP_LOCKOUT) &&
- (ch->pgrp != current->pgrp))
- return -EBUSY;
-
- ch->asyncflags |= ASYNC_CALLOUT_ACTIVE;
- return 0;
- } /* End a cud device has been opened */
- if (filp->f_flags & O_NONBLOCK)
- {
- /* -----------------------------------------------------------------
- If non-blocking mode is set, then make the check up front
- and then exit.
- -------------------------------------------------------------------- */
- if (ch->asyncflags & ASYNC_CALLOUT_ACTIVE)
- return -EBUSY;
- ch->asyncflags |= ASYNC_NORMAL_ACTIVE;
- return 0;
- }
- if (ch->asyncflags & ASYNC_CALLOUT_ACTIVE)
- {
- if (ch->normal_termios.c_cflag & CLOCAL)
- do_clocal = 1;
- }
- else
- {
- 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) &&
- !(ch->asyncflags & ASYNC_CALLOUT_ACTIVE) &&
- (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;
- /* Nothing "real" happens in open of control device */
- if (tty->driver.subtype == SERIAL_TYPE_INFO)
- {
- return (0) ;
- }
- line = MINOR(tty->device) - tty->driver.minor_start;
- if (line < 0 || line >= nbdevs)
- {
- printk(KERN_ERR "<Error> - pc_open : line out of range in pc_openn");
- tty->driver_data = NULL;
- return(-ENODEV);
- }
- MOD_INC_USE_COUNT;
- 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 commandn");
- if (setup_error_code & INVALID_NUM_PORTS)
- printk(KERN_ERR "<Error> - pc_open: Invalid number of ports specified in LILO commandn");
- if (setup_error_code & INVALID_MEM_BASE)
- printk(KERN_ERR "<Error> - pc_open: Invalid board memory address specified in LILO commandn");
- if (setup_error_code & INVALID_PORT_BASE)
- printk(KERN_ERR "<Error> - pc_open: Invalid board port address specified in LILO commandn");
- if (setup_error_code & INVALID_BOARD_STATUS)
- printk(KERN_ERR "<Error> - pc_open: Invalid board status specified in LILO commandn");
- if (setup_error_code & INVALID_ALTPIN)
- printk(KERN_ERR "<Error> - pc_open: Invalid board altpin specified in LILO commandn");
- 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.
- -------------------------------------------------------------------- */
- /* Should this be here except for SPLIT termios ? */
- if (ch->count == 1)
- {
- if (tty->driver.subtype == SERIAL_TYPE_NORMAL)
- *tty->termios = ch->normal_termios;
- else
- *tty->termios = ch->callout_termios;
- }
- ch->session = current->session;
- ch->pgrp = current->pgrp;
- 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
- /* -------------------- Begin init_module ---------------------- */
- int __init init_module()
- { /* Begin init_module */
- unsigned long flags;
- save_flags(flags);
- cli();
- pc_init();
- restore_flags(flags);
- return(0);
- } /* End init_module */
- #endif
- #ifdef ENABLE_PCI
- static struct pci_driver epca_driver;
- #endif
- #ifdef MODULE
- /* -------------------- Begin cleanup_module ---------------------- */
- void cleanup_module()
- { /* Begin cleanup_module */
- 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_callout)) ||
- (tty_unregister_driver(&pc_info)))
- {
- printk(KERN_WARNING "<Error> - DIGI : cleanup_module failed to un-register tty drivern");
- restore_flags(flags);
- return;
- }
- 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 failedn");
- 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);
- } /* End cleanup_module */
- #endif /* MODULE */
- /* ------------------ 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 */
- /* -----------------------------------------------------------------------
- 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 (pci_present())
- {
- if(num_cards < MAXBOARDS)
- pci_boards_found += init_PCI();
- num_cards += pci_boards_found;
- }
- else
- {
- printk(KERN_ERR "<Error> - No PCI BIOS foundn");
- }
- #endif /* ENABLE_PCI */
- memset(&pc_driver, 0, sizeof(struct tty_driver));
- memset(&pc_callout, 0, sizeof(struct tty_driver));
- memset(&pc_info, 0, sizeof(struct tty_driver));
- pc_driver.magic = TTY_DRIVER_MAGIC;
- pc_driver.name = "ttyD";
- pc_driver.major = DIGI_MAJOR;
- pc_driver.minor_start = 0;
- pc_driver.num = MAX_ALLOC;
- 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;
- pc_driver.refcount = &pc_refcount;
- pc_driver.table = pc_table;
-
- /* pc_termios is an array of pointers pointing at termios structs */
- /* The below should get the first pointer */
- pc_driver.termios = pc_termios;
- pc_driver.termios_locked = pc_termios_locked;
- /* ------------------------------------------------------------------
- Setup entry points for the driver. These are primarily called by
- the kernel in tty_io.c and n_tty.c
- --------------------------------------------------------------------- */
- pc_driver.open = pc_open;
- pc_driver.close = pc_close;
- pc_driver.write = pc_write;
- pc_driver.write_room = pc_write_room;
- pc_driver.flush_buffer = pc_flush_buffer;
- pc_driver.chars_in_buffer = pc_chars_in_buffer;
- pc_driver.flush_chars = pc_flush_chars;
- pc_driver.put_char = pc_put_char;
- pc_driver.ioctl = pc_ioctl;
- pc_driver.set_termios = pc_set_termios;
- pc_driver.stop = pc_stop;
- pc_driver.start = pc_start;
- pc_driver.throttle = pc_throttle;
- pc_driver.unthrottle = pc_unthrottle;
- pc_driver.hangup = pc_hangup;
- pc_callout = pc_driver;
- pc_callout.name = "cud";
- pc_callout.major = DIGICU_MAJOR;
- pc_callout.minor_start = 0;
- pc_callout.init_termios.c_cflag = B9600 | CS8 | CREAD | CLOCAL | HUPCL;
- pc_callout.subtype = SERIAL_TYPE_CALLOUT;
- pc_info = pc_driver;
- pc_info.name = "digi_ctl";
- pc_info.major = DIGIINFOMAJOR;
- pc_info.minor_start = 0;
- pc_info.num = 1;
- pc_info.init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL;
- pc_info.subtype = SERIAL_TYPE_INFO;
- 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 its 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 XIn",(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_callout))
- panic("Couldn't register Digi PC/ callout");
- 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)
- request_region((int)bd->port, 4, board_desc[bd->type]);
- 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;
- ch->tqueue.routine = do_softint;
- ch->tqueue.data = 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 = 0;
- 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;
- ch->callout_termios = pc_callout.init_termios;
- ch->normal_termios = pc_driver.init_termios;
- 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%xn",i);
- }
- 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 = %dn",
- 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 = %dn",
- 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;
- if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
- tty->ldisc.write_wakeup)
- (tty->ldisc.write_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;
- if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
- tty->ldisc.write_wakeup)
- (tty->ldisc.write_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 = %xn", __LINE__,
- cmd, head);
- printk(KERN_ERR "line %d: Out of range, cmdMax = %x, cmdStart = %xn", __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) || (tty->driver.subtype == SERIAL_TYPE_CALLOUT))
- { /* 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, handeling of parity errors, and
- break handeling are all set here.
- ------------------------------------------------------------------- */
- /* break handeling, parity handeling, 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; propogate 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; propogate 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 = 0;
- 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 minor = %dn",MINOR(tty->device));
- }
- 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 failedn");
-
- 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 */
- /* --------------------- Begin pc_ioctl ----------------------- */
- 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, error;
- unsigned long flags;
- unsigned int mflag, mstat;
- unsigned char startc, stopc;
- volatile struct board_chan *bc;
- struct channel *ch = (struct channel *) tty->driver_data;
-
- /* The control device has it's own set of commands */
- if (tty->driver.subtype == SERIAL_TYPE_INFO)
- { /* Begin if subtype is the control device */
- switch (cmd)
- { /* Begin switch cmd */
- case DIGI_GETINFO:
- { /* Begin case DIGI_GETINFO */
- struct digi_info di ;
- int brd;
- getUser(brd, (unsigned int *)arg);
- if ((error = verify_area(VERIFY_WRITE, (char*)arg, sizeof(di))))
- {
- printk(KERN_ERR "DIGI_GETINFO : verify area size 0x%x failedn",sizeof(di));
- return(error);
- }
- 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((char *)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) ;
- } /* End if subtype is the control device */
- 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((struct termios *)arg,
- tty->termios, sizeof(struct termios)))
- return -EFAULT;
- return(0);
- case TCGETA:
- return get_termio(tty, (struct termio *)arg);
- 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;
- /* Setup an event to indicate when the transmit buffer empties */
- setup_empty_event(tty,ch);
- tty_wait_until_sent(tty, 0);
- digi_send_break(ch, arg ? arg*(HZ/10) : HZ/4);
- return 0;
- case TIOCGSOFTCAR:
- error = verify_area(VERIFY_WRITE, (void *) arg,sizeof(long));
- if (error)
- return error;
- putUser(C_CLOCAL(tty) ? 1 : 0,
- (unsigned long *) arg);
- return 0;
- case TIOCSSOFTCAR:
- /*RONNIE PUT VERIFY_READ (See above) check here */
- {
- unsigned int value;
- getUser(value, (unsigned int *)arg);
- tty->termios->c_cflag =
- ((tty->termios->c_cflag & ~CLOCAL) |
- (value ? CLOCAL : 0));
- return 0;
- }
- case TIOCMODG:
- case TIOCMGET:
- mflag = 0;
- 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;
- error = verify_area(VERIFY_WRITE, (void *) arg,sizeof(long));
- if (error)
- return error;
- putUser(mflag, (unsigned int *) arg);
- break;
- case TIOCMBIS:
- case TIOCMBIC:
- case TIOCMODS:
- case TIOCMSET:
- getUser(mstat, (unsigned int *)arg);
- mflag = 0;
- if (mstat & TIOCM_DTR)
- mflag |= ch->m_dtr;
- if (mstat & TIOCM_RTS)
- mflag |= ch->m_rts;
- switch (cmd)
- { /* Begin switch cmd */
- case TIOCMODS:
- case TIOCMSET:
- ch->modemfake = ch->m_dtr|ch->m_rts;
- ch->modem = mflag;
- break;
- case TIOCMBIS:
- ch->modemfake |= mflag;
- ch->modem |= mflag;
- break;
- case TIOCMBIC:
- ch->modemfake |= mflag;
- ch->modem &= ~mflag;
- break;
- } /* End switch cmd */
- cli();
- 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);
- break;
- case TIOCSDTR:
- ch->omodem |= ch->m_dtr;
- cli();
- globalwinon(ch);
- fepcmd(ch, SETMODEM, ch->m_dtr, 0, 10, 1);
- memoff(ch);
- restore_flags(flags);
- break;
- case TIOCCDTR:
- ch->omodem &= ~ch->m_dtr;
- cli();
- globalwinon(ch);
- fepcmd(ch, SETMODEM, 0, ch->m_dtr, 10, 1);
- memoff(ch);
- restore_flags(flags);
- break;
- case DIGI_GETA:
- if (copy_to_user((char*)arg, &ch->digiext,
- sizeof(digi_t)))
- return -EFAULT;
- break;
- case DIGI_SETAW:
- case DIGI_SETAF:
- if ((cmd) == (DIGI_SETAW))
- {
- /* Setup an event to indicate when the transmit buffer empties */
- setup_empty_event(tty,ch);
- tty_wait_until_sent(tty, 0);
- }
- else
- {
- if (tty->ldisc.flush_buffer)
- tty->ldisc.flush_buffer(tty);
- }
- /* Fall Thru */
- case DIGI_SETA:
- if (copy_from_user(&ch->digiext, (char*)arg,
- sizeof(digi_t)))
- return -EFAULT;
-
- if (ch->digiext.digi_flags & DIGI_ALTPIN)
- {
- ch->dcd = ch->m_dsr;
- ch->dsr = ch->m_dcd;
- }
- else
- {
- ch->dcd = ch->m_dcd;
- ch->dsr = ch->m_dsr;
- }
-
- cli();
- 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);
- break;
- case DIGI_GETFLOW:
- case DIGI_GETAFLOW:
- cli();
- globalwinon(ch);
- if ((cmd) == (DIGI_GETFLOW))
- {
- dflow.startc = bc->startc;
- dflow.stopc = bc->stopc;
- }
- else
- {
- dflow.startc = bc->startca;
- dflow.stopc = bc->stopca;
- }
- memoff(ch);
- restore_flags(flags);
- if (copy_to_user((char*)arg, &dflow, sizeof(dflow)))
- return -EFAULT;
- break;
- case DIGI_SETAFLOW:
- case DIGI_SETFLOW:
- if ((cmd) == (DIGI_SETFLOW))
- {
- startc = ch->startc;
- stopc = ch->stopc;
- }
- else
- {
- startc = ch->startca;
- stopc = ch->stopca;
- }
- if (copy_from_user(&dflow, (char*)arg, sizeof(dflow)))
- return -EFAULT;
- if (dflow.startc != startc || dflow.stopc != stopc)
- { /* Begin if setflow toggled */
- cli();
- globalwinon(ch);
- if ((cmd) == (DIGI_SETFLOW))
- {
- ch->fepstartc = ch->startc = dflow.startc;
- ch->fepstopc = ch->stopc = dflow.stopc;
- fepcmd(ch, SONOFFC, ch->fepstartc, ch->fepstopc, 0, 1);
- }
- else
- {
- ch->fepstartca = ch->startca = dflow.startc;
- ch->fepstopca = ch->stopca = dflow.stopc;
- fepcmd(ch, SAUXONOFFC, ch->fepstartca, ch->fepstopca, 0, 1);
- }
- if (ch->statusflags & TXSTOPPED)
- pc_start(tty);
- memoff(ch);
- restore_flags(flags);
- } /* End if setflow toggled */
- break;
- default:
- return -ENOIOCTLCMD;
- } /* End switch cmd */
- return 0;
- } /* End pc_ioctl */
- /* --------------------- Begin pc_set_termios ----------------------- */
- static void pc_set_termios(struct tty_struct *tty, struct termios *old_termios)
- { /* Begin pc_set_termios */
- 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 channel valid */
- save_flags(flags);
- cli();
- globalwinon(ch);
- epcaparam(tty, ch);
- memoff(ch);
- if ((old_termios->c_cflag & CRTSCTS) &&
- ((tty->termios->c_cflag & CRTSCTS) == 0))
- tty->hw_stopped = 0;
- if (!(old_termios->c_cflag & CLOCAL) &&
- (tty->termios->c_cflag & CLOCAL))
- wake_up_interruptible(&ch->open_wait);
- restore_flags(flags);
- } /* End if channel valid */
- } /* End pc_set_termios */
- /* --------------------- Begin do_softint ----------------------- */
- static void do_softint(void *private_)
- { /* Begin do_softint */
- struct channel *ch = (struct channel *) private_;
-
- /* Called in response to a modem change event */
- if (ch && ch->magic == EPCA_MAGIC)
- { /* Begin EPCA_MAGIC */
- struct tty_struct *tty = ch->tty;
- if (tty && tty->driver_data)
- {
- if (test_and_clear_bit(EPCA_EVENT_HANGUP, &ch->event))
- { /* Begin if clear_bit */
- tty_hangup(tty); /* FIXME: module removal race here - AKPM */
- wake_up_interruptible(&ch->open_wait);
- ch->asyncflags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_CALLOUT_ACTIVE);
- } /* End if clear_bit */
- }
- } /* End EPCA_MAGIC */
- MOD_DEC_USE_COUNT;
- } /* End do_softint */
- /* ------------------------------------------------------------
- pc_stop and pc_start provide software flow control to the
- routine and the pc_ioctl routine.
- ---------------------------------------------------------------- */
- /* --------------------- Begin pc_stop ----------------------- */
- static void pc_stop(struct tty_struct *tty)
- { /* Begin pc_stop */
- 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 valid channel */
- save_flags(flags);
- cli();
- if ((ch->statusflags & TXSTOPPED) == 0)
- { /* Begin if transmit stop requested */
- globalwinon(ch);
- /* STOP transmitting now !! */
- fepcmd(ch, PAUSETX, 0, 0, 0, 0);
- ch->statusflags |= TXSTOPPED;
- memoff(ch);
- } /* End if transmit stop requested */
- restore_flags(flags);
- } /* End if valid channel */
- } /* End pc_stop */
- /* --------------------- Begin pc_start ----------------------- */
- static void pc_start(struct tty_struct *tty)
- { /* Begin pc_start */
- 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 channel valid */
- unsigned long flags;
- save_flags(flags);
- cli();
- /* Just in case output was resumed because of a change in Digi-flow */
- if (ch->statusflags & TXSTOPPED)
- { /* Begin transmit resume requested */
- volatile struct board_chan *bc;
- globalwinon(ch);
- bc = ch->brdchan;
- if (ch->statusflags & LOWWAIT)
- bc->ilow = 1;
- /* Okay, you can start transmitting again... */
- fepcmd(ch, RESUMETX, 0, 0, 0, 0);
- ch->statusflags &= ~TXSTOPPED;
- memoff(ch);
- } /* End transmit resume requested */
- restore_flags(flags);
- } /* End if channel valid */
- } /* End pc_start */
- /* ------------------------------------------------------------------
- The below routines pc_throttle and pc_unthrottle are used
- to slow (And resume) the receipt of data into the kernels
- receive buffers. The exact occurence of this depends on the
- size of the kernels receive buffer and what the 'watermarks'
- are set to for that buffer. See the n_ttys.c file for more
- details.
- ______________________________________________________________________ */
- /* --------------------- Begin throttle ----------------------- */
- static void pc_throttle(struct tty_struct * tty)
- { /* Begin pc_throttle */
- 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 channel valid */
- save_flags(flags);
- cli();
- if ((ch->statusflags & RXSTOPPED) == 0)
- {
- globalwinon(ch);
- fepcmd(ch, PAUSERX, 0, 0, 0, 0);
- ch->statusflags |= RXSTOPPED;
- memoff(ch);
- }
- restore_flags(flags);
- } /* End if channel valid */
- } /* End pc_throttle */
- /* --------------------- Begin unthrottle ----------------------- */
- static void pc_unthrottle(struct tty_struct *tty)
- { /* Begin pc_unthrottle */
- struct channel *ch;
- unsigned long flags;
- 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)
- { /* Begin if channel valid */
- /* Just in case output was resumed because of a change in Digi-flow */
- save_flags(flags);
- cli();
- if (ch->statusflags & RXSTOPPED)
- {
- globalwinon(ch);
- bc = ch->brdchan;
- fepcmd(ch, RESUMERX, 0, 0, 0, 0);
- ch->statusflags &= ~RXSTOPPED;
- memoff(ch);
- }
- restore_flags(flags);
- } /* End if channel valid */
- } /* End pc_unthrottle */
- /* --------------------- Begin digi_send_break ----------------------- */
- void digi_send_break(struct channel *ch, int msec)
- { /* Begin digi_send_break */
- unsigned long flags;
- save_flags(flags);
- cli();
- globalwinon(ch);
- /* --------------------------------------------------------------------
- Maybe I should send an infinite break here, schedule() for
- msec amount of time, and then stop the break. This way,
- the user can't screw up the FEP by causing digi_send_break()
- to be called (i.e. via an ioctl()) more than once in msec amount
- of time. Try this for now...
- ------------------------------------------------------------------------ */
- fepcmd(ch, SENDBREAK, msec, 0, 10, 0);
- memoff(ch);
- restore_flags(flags);
- } /* End digi_send_break */
- /* --------------------- Begin setup_empty_event ----------------------- */
- static void setup_empty_event(struct tty_struct *tty, struct channel *ch)
- { /* Begin setup_empty_event */
- volatile struct board_chan *bc = ch->brdchan;
- unsigned long int flags;
- save_flags(flags);
- cli();
- globalwinon(ch);
- ch->statusflags |= EMPTYWAIT;
-
- /* ------------------------------------------------------------------
- When set the iempty flag request a event to be generated when the
- transmit buffer is empty (If there is no BREAK in progress).
- --------------------------------------------------------------------- */
- bc->iempty = 1;
- memoff(ch);
- restore_flags(flags);
- } /* End setup_empty_event */
- /* --------------------- Begin get_termio ----------------------- */
- static int get_termio(struct tty_struct * tty, struct termio * termio)
- { /* Begin get_termio */
- int error;
- error = verify_area(VERIFY_WRITE, termio, sizeof (struct termio));
- if (error)
- return error;
- kernel_termios_to_user_termio(termio, tty->termios);
- return 0;
- } /* End get_termio */
- /* ---------------------- Begin epca_setup -------------------------- */
- void epca_setup(char *str, int *ints)
- { /* Begin epca_setup */
- struct board_info board;
- int index, loop, last;
- char *temp, *t2;
- unsigned len;
- /* ----------------------------------------------------------------------
- If this routine looks a little strange it is because it is only called
- if a LILO append command is given to boot the kernel with parameters.
- In this way, we can provide the user a method of changing his board
- configuration without rebuilding the kernel.
- ----------------------------------------------------------------------- */
- if (!liloconfig)
- liloconfig = 1;
- memset(&board, 0, sizeof(board));
- /* Assume the data is int first, later we can change it */
- /* I think that array position 0 of ints holds the number of args */
- for (last = 0, index = 1; index <= ints[0]; index++)
- switch(index)
- { /* Begin parse switch */
- case 1:
- board.status = ints[index];
-
- /* ---------------------------------------------------------
- We check for 2 (As opposed to 1; because 2 is a flag
- instructing the driver to ignore epcaconfig.) For this
- reason we check for 2.
- ------------------------------------------------------------ */
- if (board.status == 2)
- { /* Begin ignore epcaconfig as well as lilo cmd line */
- nbdevs = 0;
- num_cards = 0;
- return;
- } /* End ignore epcaconfig as well as lilo cmd line */
-
- if (board.status > 2)
- {
- printk(KERN_ERR "<Error> - epca_setup: Invalid board status 0x%xn", board.status);
- invalid_lilo_config = 1;
- setup_error_code |= INVALID_BOARD_STATUS;
- return;
- }
- last = index;
- break;
- case 2:
- board.type = ints[index];
- if (board.type >= PCIXEM)
- {
- printk(KERN_ERR "<Error> - epca_setup: Invalid board type 0x%xn", board.type);
- invalid_lilo_config = 1;
- setup_error_code |= INVALID_BOARD_TYPE;
- return;
- }
- last = index;
- break;
- case 3:
- board.altpin = ints[index];
- if (board.altpin > 1)
- {
- printk(KERN_ERR "<Error> - epca_setup: Invalid board altpin 0x%xn", board.altpin);
- invalid_lilo_config = 1;
- setup_error_code |= INVALID_ALTPIN;
- return;
- }
- last = index;
- break;
- case 4:
- board.numports = ints[index];
- if ((board.numports < 2) || (board.numports > 256))
- {
- printk(KERN_ERR "<Error> - epca_setup: Invalid board numports 0x%xn", board.numports);
- invalid_lilo_config = 1;
- setup_error_code |= INVALID_NUM_PORTS;
- return;
- }
- nbdevs += board.numports;
- last = index;
- break;
- case 5:
- board.port = (unsigned char *)ints[index];
- if (board.port <= 0)
- {
- printk(KERN_ERR "<Error> - epca_setup: Invalid io port 0x%xn", (unsigned int)board.port);
- invalid_lilo_config = 1;
- setup_error_code |= INVALID_PORT_BASE;
- return;
- }
- last = index;
- break;
- case 6:
- board.membase = (unsigned char *)ints[index];
- if (board.membase <= 0)
- {
- printk(KERN_ERR "<Error> - epca_setup: Invalid memory base 0x%xn",(unsigned int)board.membase);
- invalid_lilo_config = 1;
- setup_error_code |= INVALID_MEM_BASE;
- return;
- }
- last = index;
- break;
- default:
- printk(KERN_ERR "<Error> - epca_setup: Too many integer parmsn");
- return;
- } /* End parse switch */
- while (str && *str)
- { /* Begin while there is a string arg */
- /* find the next comma or terminator */
- temp = str;
- /* While string is not null, and a comma hasn't been found */
- while (*temp && (*temp != ','))
- temp++;
- if (!*temp)
- temp = NULL;
- else
- *temp++ = 0;
- /* Set index to the number of args + 1 */
- index = last + 1;
- switch(index)
- {
- case 1:
- len = strlen(str);
- if (strncmp("Disable", str, len) == 0)
- board.status = 0;
- else
- if (strncmp("Enable", str, len) == 0)
- board.status = 1;
- else
- {
- printk(KERN_ERR "<Error> - epca_setup: Invalid status %sn", str);
- invalid_lilo_config = 1;
- setup_error_code |= INVALID_BOARD_STATUS;
- return;
- }
- last = index;
- break;
- case 2:
- for(loop = 0; loop < EPCA_NUM_TYPES; loop++)
- if (strcmp(board_desc[loop], str) == 0)
- break;
- /* ---------------------------------------------------------------
- If the index incremented above refers to a legitamate board
- type set it here.
- ------------------------------------------------------------------*/
- if (index < EPCA_NUM_TYPES)
- board.type = loop;
- else
- {
- printk(KERN_ERR "<Error> - epca_setup: Invalid board type: %sn", str);
- invalid_lilo_config = 1;
- setup_error_code |= INVALID_BOARD_TYPE;
- return;
- }
- last = index;
- break;
- case 3:
- len = strlen(str);
- if (strncmp("Disable", str, len) == 0)
- board.altpin = 0;
- else
- if (strncmp("Enable", str, len) == 0)
- board.altpin = 1;
- else
- {
- printk(KERN_ERR "<Error> - epca_setup: Invalid altpin %sn", str);
- invalid_lilo_config = 1;
- setup_error_code |= INVALID_ALTPIN;
- return;
- }
- last = index;
- break;
- case 4:
- t2 = str;
- while (isdigit(*t2))
- t2++;
- if (*t2)
- {
- printk(KERN_ERR "<Error> - epca_setup: Invalid port count %sn", str);
- invalid_lilo_config = 1;
- setup_error_code |= INVALID_NUM_PORTS;
- return;
- }
- /* ------------------------------------------------------------
- There is not a man page for simple_strtoul but the code can be
- found in vsprintf.c. The first argument is the string to
- translate (To an unsigned long obviously), the second argument
- can be the address of any character variable or a NULL. If a
- variable is given, the end pointer of the string will be stored
- in that variable; if a NULL is given the end pointer will
- not be returned. The last argument is the base to use. If
- a 0 is indicated, the routine will attempt to determine the
- proper base by looking at the values prefix (A '0' for octal,
- a 'x' for hex, etc ... If a value is given it will use that
- value as the base.
- ---------------------------------------------------------------- */
- board.numports = simple_strtoul(str, NULL, 0);
- nbdevs += board.numports;
- last = index;
- break;
- case 5:
- t2 = str;
- while (isxdigit(*t2))
- t2++;
- if (*t2)
- {
- printk(KERN_ERR "<Error> - epca_setup: Invalid i/o address %sn", str);
- invalid_lilo_config = 1;
- setup_error_code |= INVALID_PORT_BASE;
- return;
- }
- board.port = (unsigned char *)simple_strtoul(str, NULL, 16);
- last = index;
- break;
- case 6:
- t2 = str;
- while (isxdigit(*t2))
- t2++;
- if (*t2)
- {
- printk(KERN_ERR "<Error> - epca_setup: Invalid memory base %sn",str);
- invalid_lilo_config = 1;
- setup_error_code |= INVALID_MEM_BASE;
- return;
- }
- board.membase = (unsigned char *)simple_strtoul(str, NULL, 16);
- last = index;
- break;
- default:
- printk(KERN_ERR "PC/Xx: Too many string parmsn");
- return;
- }
- str = temp;
- } /* End while there is a string arg */
- if (last < 6)
- {
- printk(KERN_ERR "PC/Xx: Insufficient parms specifiedn");
- return;
- }
-
- /* I should REALLY validate the stuff here */
- /* Copies our local copy of board into boards */
- memcpy((void *)&boards[num_cards],(void *)&board, sizeof(board));
- /* Does this get called once per lilo arg are what ? */
- printk(KERN_INFO "PC/Xx: Added board %i, %s %i ports at 0x%4.4X base 0x%6.6Xn",
- num_cards, board_desc[board.type],
- board.numports, (int)board.port, (unsigned int) board.membase);
- num_cards++;
- } /* End epca_setup */
- #ifdef ENABLE_PCI
- /* ------------------------ Begin init_PCI --------------------------- */
- enum epic_board_types {
- brd_xr = 0,
- brd_xem,
- brd_cx,
- brd_xrj,
- };
- /* indexed directly by epic_board_types enum */
- static struct {
- unsigned char board_type;
- unsigned bar_idx; /* PCI base address region */
- } epca_info_tbl[] = {
- { PCIXR, 0, },
- { PCIXEM, 0, },
- { PCICX, 0, },
- { PCIXRJ, 2, },
- };
- static int __init epca_init_one (struct pci_dev *pdev,
- const struct pci_device_id *ent)
- {
- static int board_num = -1;
- int board_idx, info_idx = ent->driver_data;
- unsigned long addr;
- if (pci_enable_device(pdev))
- return -EIO;
- board_num++;
- board_idx = board_num + num_cards;
- if (board_idx >= MAXBOARDS)
- goto err_out;
-
- addr = pci_resource_start (pdev, epca_info_tbl[info_idx].bar_idx);
- if (!addr) {
- printk (KERN_ERR PFX "PCI region #%d not available (size 0)n",
- epca_info_tbl[info_idx].bar_idx);
- goto err_out;
- }
- boards[board_idx].status = ENABLED;
- boards[board_idx].type = epca_info_tbl[info_idx].board_type;
- boards[board_idx].numports = 0x0;
- boards[board_idx].port =
- (unsigned char *)((char *) addr + PCI_IO_OFFSET);
- boards[board_idx].membase =
- (unsigned char *)((char *) addr);
- if (!request_mem_region (addr + PCI_IO_OFFSET, 0x200000, "epca")) {
- printk (KERN_ERR PFX "resource 0x%x @ 0x%lx unavailablen",
- 0x200000, addr + PCI_IO_OFFSET);
- goto err_out;
- }
- boards[board_idx].re_map_port = ioremap(addr + PCI_IO_OFFSET, 0x200000);
- if (!boards[board_idx].re_map_port) {
- printk (KERN_ERR PFX "cannot map 0x%x @ 0x%lxn",
- 0x200000, addr + PCI_IO_OFFSET);
- goto err_out_free_pciio;
- }
- if (!request_mem_region (addr, 0x200000, "epca")) {
- printk (KERN_ERR PFX "resource 0x%x @ 0x%lx unavailablen",
- 0x200000, addr);
- goto err_out_free_iounmap;
- }
- boards[board_idx].re_map_membase = ioremap(addr, 0x200000);
- if (!boards[board_idx].re_map_membase) {
- printk (KERN_ERR PFX "cannot map 0x%x @ 0x%lxn",
- 0x200000, addr + PCI_IO_OFFSET);
- goto err_out_free_memregion;
- }
- /* --------------------------------------------------------------
- I don't know what the below does, but the hardware guys say
- its required on everything except PLX (In this case XRJ).
- ---------------------------------------------------------------- */
- if (info_idx != brd_xrj) {
- pci_write_config_byte(pdev, 0x40, 0);
- pci_write_config_byte(pdev, 0x46, 0);
- }
-
- return 0;
- err_out_free_memregion:
- release_mem_region (addr, 0x200000);
- err_out_free_iounmap:
- iounmap (boards[board_idx].re_map_port);
- err_out_free_pciio:
- release_mem_region (addr + PCI_IO_OFFSET, 0x200000);
- err_out:
- return -ENODEV;
- }
- static struct pci_device_id epca_pci_tbl[] __initdata = {
- { PCI_VENDOR_DIGI, PCI_DEVICE_XR, PCI_ANY_ID, PCI_ANY_ID, 0, 0, brd_xr },
- { PCI_VENDOR_DIGI, PCI_DEVICE_XEM, PCI_ANY_ID, PCI_ANY_ID, 0, 0, brd_xem },
- { PCI_VENDOR_DIGI, PCI_DEVICE_CX, PCI_ANY_ID, PCI_ANY_ID, 0, 0, brd_cx },
- { PCI_VENDOR_DIGI, PCI_DEVICE_XRJ, PCI_ANY_ID, PCI_ANY_ID, 0, 0, brd_xrj },
- { 0, }
- };
- MODULE_DEVICE_TABLE(pci, epca_pci_tbl);
- int __init init_PCI (void)
- { /* Begin init_PCI */
-
- int pci_count;
-
- memset (&epca_driver, 0, sizeof (epca_driver));
- epca_driver.name = "epca";
- epca_driver.id_table = epca_pci_tbl;
- epca_driver.probe = epca_init_one;
- pci_count = pci_register_driver (&epca_driver);
-
- if (pci_count <= 0) {
- pci_unregister_driver (&epca_driver);
- pci_count = 0;
- }
- return(pci_count);
- } /* End init_PCI */
- #endif /* ENABLE_PCI */
- MODULE_LICENSE("GPL");