litmus-rt.git - The LITMUS^RT kernel.

diff options

Diffstat (limited to 'arch/s390/mm/fault.c')

-rw-r--r--

1 files changed, 1 insertions, 1 deletions


diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c index 14c241ccdd4d..2456b52ed068 100644 --- a/arch/s390/mm/fault.c +++ b/arch/s390/mm/fault.c
@@ -211,7 +211,7 @@ static int do_out_of_memory(struct pt_regs *regs, unsigned long error_code,
211	struct mm_struct *mm = tsk->mm;	211	struct mm_struct *mm = tsk->mm;
212		212
213	up_read(&mm->mmap_sem);	213	up_read(&mm->mmap_sem);
214	if (is_init(tsk)) {	214	if (is_global_init(tsk)) {
215	yield();	215	yield();
216	down_read(&mm->mmap_sem);	216	down_read(&mm->mmap_sem);
217	return 1;	217	return 1;

/* Copyright (C) 1996 Digi International. For technical support please email digiLinux@dgii.com or call Digi tech support at (612) 912-3456 ** This driver is no longer supported by Digi ** Much of this design and code came from epca.c which was copyright (C) 1994, 1995 Troy De Jongh, and subsquently modified by David Nugent, Christoph Lameter, Mike McLagan. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. --------------------------------------------------------------------------- */ /* See README.epca for change history --DAT*/ #include <linux/config.h> #include <linux/module.h> #include <linux/kernel.h> #include <linux/types.h> #include <linux/init.h> #include <linux/serial.h> #include <linux/delay.h> #include <linux/ctype.h> #include <linux/tty.h> #include <linux/tty_flip.h> #include <linux/slab.h> #include <linux/ioport.h> #include <linux/interrupt.h> #include <asm/uaccess.h> #include <asm/io.h> #include <linux/spinlock.h> #include <linux/pci.h> #include "digiPCI.h" #include "digi1.h" #include "digiFep1.h" #include "epca.h" #include "epcaconfig.h" /* ---------------------- Begin defines ------------------------ */ #define VERSION "1.3.0.1-LK2.6" /* This major needs to be submitted to Linux to join the majors list */ #define DIGIINFOMAJOR 35 /* For Digi specific ioctl */ #define MAXCARDS 7 #define epcaassert(x, msg) if (!(x)) epca_error(__LINE__, msg) #define PFX "epca: " /* ----------------- Begin global definitions ------------------- */ static int nbdevs, num_cards, liloconfig; static int digi_poller_inhibited = 1 ; static int setup_error_code; static int invalid_lilo_config; /* The ISA boards do window flipping into the same spaces so its only sane with a single lock. It's still pretty efficient */ static DEFINE_SPINLOCK(epca_lock); /* ----------------------------------------------------------------------- MAXBOARDS is typically 12, but ISA and EISA cards are restricted to 7 below. --------------------------------------------------------------------------*/ static struct board_info boards[MAXBOARDS]; /* ------------- Begin structures used for driver registeration ---------- */ static struct tty_driver *pc_driver; static struct tty_driver *pc_info; /* ------------------ Begin Digi specific structures -------------------- */ /* ------------------------------------------------------------------------ digi_channels represents an array of structures that keep track of each channel of the Digi product. Information such as transmit and receive pointers, termio data, and signal definitions (DTR, CTS, etc ...) are stored here. This structure is NOT used to overlay the cards physical channel structure. -------------------------------------------------------------------------- */ static struct channel digi_channels[MAX_ALLOC]; /* ------------------------------------------------------------------------ card_ptr is an array used to hold the address of the first channel structure of each card. This array will hold the addresses of various channels located in digi_channels. -------------------------------------------------------------------------- */ static struct channel *card_ptr[MAXCARDS]; static struct timer_list epca_timer; /* ---------------------- Begin function prototypes --------------------- */ /* ---------------------------------------------------------------------- Begin generic memory functions. These functions will be alias (point at) more specific functions dependent on the board being configured. ----------------------------------------------------------------------- */ static void memwinon(struct board_info *b, unsigned int win); static void memwinoff(struct board_info *b, unsigned int win); static void globalwinon(struct channel *ch); static void rxwinon(struct channel *ch); static void txwinon(struct channel *ch); static void memoff(struct channel *ch); static void assertgwinon(struct channel *ch); static void assertmemoff(struct channel *ch); /* ---- Begin more 'specific' memory functions for cx_like products --- */ static void pcxem_memwinon(struct board_info *b, unsigned int win); static void pcxem_memwinoff(struct board_info *b, unsigned int win); static void pcxem_globalwinon(struct channel *ch); static void pcxem_rxwinon(struct channel *ch); static void pcxem_txwinon(struct channel *ch); static void pcxem_memoff(struct channel *ch); /* ------ Begin more 'specific' memory functions for the pcxe ------- */ static void pcxe_memwinon(struct board_info *b, unsigned int win); static void pcxe_memwinoff(struct board_info *b, unsigned int win); static void pcxe_globalwinon(struct channel *ch); static void pcxe_rxwinon(struct channel *ch); static void pcxe_txwinon(struct channel *ch); static 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 void pcxi_memwinon(struct board_info *b, unsigned int win); static void pcxi_memwinoff(struct board_info *b, unsigned int win); static void pcxi_globalwinon(struct channel *ch); static void pcxi_rxwinon(struct channel *ch); static void pcxi_txwinon(struct channel *ch); static void pcxi_memoff(struct channel *ch); /* - Begin 'specific' do nothing memory functions needed for some cards - */ static void dummy_memwinon(struct board_info *b, unsigned int win); static void dummy_memwinoff(struct board_info *b, unsigned int win); static void dummy_globalwinon(struct channel *ch); static void dummy_rxwinon(struct channel *ch); static void dummy_txwinon(struct channel *ch); static void dummy_memoff(struct channel *ch); static void dummy_assertgwinon(struct channel *ch); static void dummy_assertmemoff(struct channel *ch); /* ------------------- Begin declare functions ----------------------- */ static struct channel *verifyChannel(struct tty_struct *); static void pc_sched_event(struct channel *, int); static void epca_error(int, char *); static void pc_close(struct tty_struct *, struct file *); static void shutdown(struct channel *); static void pc_hangup(struct tty_struct *); static void pc_put_char(struct tty_struct *, unsigned char); static int pc_write_room(struct tty_struct *); static int pc_chars_in_buffer(struct tty_struct *); static void pc_flush_buffer(struct tty_struct *); static void pc_flush_chars(struct tty_struct *); static int block_til_ready(struct tty_struct *, struct file *, struct channel *); static int pc_open(struct tty_struct *, struct file *); static void post_fep_init(unsigned int crd); static void epcapoll(unsigned long); static void doevent(int); static void fepcmd(struct channel *, int, int, int, int, int); static unsigned termios2digi_h(struct channel *ch, unsigned); static unsigned termios2digi_i(struct channel *ch, unsigned); static unsigned termios2digi_c(struct channel *ch, unsigned); static void epcaparam(struct tty_struct *, struct channel *); static void receive_data(struct channel *); static int pc_ioctl(struct tty_struct *, struct file *, unsigned int, unsigned long); static int info_ioctl(struct tty_struct *, struct file *, unsigned int, unsigned long); static void pc_set_termios(struct tty_struct *, struct termios *); static void do_softint(void *); static void pc_stop(struct tty_struct *); static void pc_start(struct tty_struct *); static void pc_throttle(struct tty_struct * tty); static void pc_unthrottle(struct tty_struct *tty); static void digi_send_break(struct channel *ch, int msec); static void setup_empty_event(struct tty_struct *tty, struct channel *ch); void epca_setup(char *, int *); static int get_termio(struct tty_struct *, struct termio __user *); static int pc_write(struct tty_struct *, const unsigned char *, int); static int pc_init(void); static int init_PCI(void); /* ------------------------------------------------------------------ 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 void memwinon(struct board_info *b, unsigned int win) { (b->memwinon)(b, win); } static void memwinoff(struct board_info *b, unsigned int win) { (b->memwinoff)(b, win); } static void globalwinon(struct channel *ch) { (ch->board->globalwinon)(ch); } static void rxwinon(struct channel *ch) { (ch->board->rxwinon)(ch); } static void txwinon(struct channel *ch) { (ch->board->txwinon)(ch); } static void memoff(struct channel *ch) { (ch->board->memoff)(ch); } static void assertgwinon(struct channel *ch) { (ch->board->assertgwinon)(ch); } static 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 void pcxem_memwinon(struct board_info *b, unsigned int win) { outb_p(FEPWIN|win, b->port + 1); } static void pcxem_memwinoff(struct board_info *b, unsigned int win) { outb_p(0, b->port + 1); } static void pcxem_globalwinon(struct channel *ch) { outb_p( FEPWIN, (int)ch->board->port + 1); } static void pcxem_rxwinon(struct channel *ch) { outb_p(ch->rxwin, (int)ch->board->port + 1); } static void pcxem_txwinon(struct channel *ch) { outb_p(ch->txwin, (int)ch->board->port + 1); } static void pcxem_memoff(struct channel *ch) { outb_p(0, (int)ch->board->port + 1); } /* ----------------- Begin pcxe memory window stuff ------------------ */ static void pcxe_memwinon(struct board_info *b, unsigned int win) { outb_p(FEPWIN | win, b->port + 1); } static void pcxe_memwinoff(struct board_info *b, unsigned int win) { outb_p(inb(b->port) & ~FEPMEM, b->port + 1); outb_p(0, b->port + 1); } static void pcxe_globalwinon(struct channel *ch) { outb_p( FEPWIN, (int)ch->board->port + 1); } static void pcxe_rxwinon(struct channel *ch) { outb_p(ch->rxwin, (int)ch->board->port + 1); } static void pcxe_txwinon(struct channel *ch) { outb_p(ch->txwin, (int)ch->board->port + 1); } static 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 void pcxi_memwinon(struct board_info *b, unsigned int win) { outb_p(inb(b->port) | FEPMEM, b->port); } static void pcxi_memwinoff(struct board_info *b, unsigned int win) { outb_p(inb(b->port) & ~FEPMEM, b->port); } static void pcxi_globalwinon(struct channel *ch) { outb_p(FEPMEM, ch->board->port); } static void pcxi_rxwinon(struct channel *ch) { outb_p(FEPMEM, ch->board->port); } static void pcxi_txwinon(struct channel *ch) { outb_p(FEPMEM, ch->board->port); } static void pcxi_memoff(struct channel *ch) { outb_p(0, ch->board->port); } static void pcxi_assertgwinon(struct channel *ch) { epcaassert(inb(ch->board->port) & FEPMEM, "Global memory off"); } static void pcxi_assertmemoff(struct channel *ch) { epcaassert(!(inb(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 void dummy_memwinon(struct board_info *b, unsigned int win) { } static void dummy_memwinoff(struct board_info *b, unsigned int win) { } static void dummy_globalwinon(struct channel *ch) { } static void dummy_rxwinon(struct channel *ch) { } static void dummy_txwinon(struct channel *ch) { } static void dummy_memoff(struct channel *ch) { } static void dummy_assertgwinon(struct channel *ch) { } static void dummy_assertmemoff(struct channel *ch) { } /* ----------------- Begin verifyChannel function ----------------------- */ static struct channel *verifyChannel(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) { struct channel *ch = (struct channel *)tty->driver_data; if ((ch >= &digi_channels[0]) && (ch < &digi_channels[nbdevs])) { if (ch->magic == EPCA_MAGIC) return ch; } } return NULL; } /* End verifyChannel */ /* ------------------ Begin pc_sched_event ------------------------- */ static void pc_sched_event(struct channel *ch, int event) { /* ---------------------------------------------------------------------- We call this to schedule interrupt processing on some event. The kernel sees our request and calls the related routine in OUR driver. -------------------------------------------------------------------------*/ ch->event |= 1 << event; schedule_work(&ch->tqueue); } /* End pc_sched_event */ /* ------------------ Begin epca_error ------------------------- */ static void epca_error(int line, char *msg) { printk(KERN_ERR "epca_error (Digi): line = %d %s\n",line,msg); } /* ------------------ Begin pc_close ------------------------- */ static void pc_close(struct tty_struct * tty, struct file * filp) { struct channel *ch; unsigned long flags; /* --------------------------------------------------------- verifyChannel returns the channel from the tty struct if it is valid. This serves as a sanity check. ------------------------------------------------------------- */ if ((ch = verifyChannel(tty)) != NULL) { /* Begin if ch != NULL */ spin_lock_irqsave(&epca_lock, flags); if (tty_hung_up_p(filp)) { spin_unlock_irqrestore(&epca_lock, 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. ---------------------------------------------------------------- */ spin_unlock_irqrestore(&epca_lock, flags); return; } /* End channel is open more than once */ /* Port open only once go ahead with shutdown & reset */ BUG_ON(ch->count < 0); /* --------------------------------------------------------------- Let the rest of the driver know the channel is being closed. This becomes important if an open is attempted before close is finished. ------------------------------------------------------------------ */ ch->asyncflags |= ASYNC_CLOSING; tty->closing = 1; spin_unlock_irqrestore(&epca_lock, flags); if (ch->asyncflags & ASYNC_INITIALIZED) { /* Setup an event to indicate when the transmit buffer empties */ setup_empty_event(tty, ch); tty_wait_until_sent(tty, 3000); /* 30 seconds timeout */ } if (tty->driver->flush_buffer) tty->driver->flush_buffer(tty); tty_ldisc_flush(tty); shutdown(ch); spin_lock_irqsave(&epca_lock, flags); tty->closing = 0; ch->event = 0; ch->tty = NULL; spin_unlock_irqrestore(&epca_lock, flags); if (ch->blocked_open) { /* Begin if blocked_open */ if (ch->close_delay) msleep_interruptible(jiffies_to_msecs(ch->close_delay)); wake_up_interruptible(&ch->open_wait); } /* End if blocked_open */ ch->asyncflags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_INITIALIZED | ASYNC_CLOSING); wake_up_interruptible(&ch->close_wait); } /* End if ch != NULL */ } /* End pc_close */ /* ------------------ Begin shutdown ------------------------- */ static void shutdown(struct channel *ch) { /* Begin shutdown */ unsigned long flags; struct tty_struct *tty; struct board_chan __iomem *bc; if (!(ch->asyncflags & ASYNC_INITIALIZED)) return; spin_lock_irqsave(&epca_lock, flags); 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) writeb(0, &bc->idata); 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; spin_unlock_irqrestore(&epca_lock, 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; if (tty->driver->flush_buffer) tty->driver->flush_buffer(tty); tty_ldisc_flush(tty); shutdown(ch); spin_lock_irqsave(&epca_lock, flags); ch->tty = NULL; ch->event = 0; ch->count = 0; ch->asyncflags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_INITIALIZED); spin_unlock_irqrestore(&epca_lock, flags); wake_up_interruptible(&ch->open_wait); } /* End if ch != NULL */ } /* End pc_hangup */ /* ------------------ Begin pc_write ------------------------- */ static int pc_write(struct tty_struct * tty, const unsigned char *buf, int bytesAvailable) { /* Begin pc_write */ unsigned int head, tail; int dataLen; int size; int amountCopied; struct channel *ch; unsigned long flags; int remain; struct board_chan __iomem *bc; /* ---------------------------------------------------------------- pc_write is primarily called directly by the kernel routine tty_write (Though it can also be called by put_char) found in tty_io.c. pc_write is passed a line discipline buffer where the data to be written out is stored. The line discipline implementation itself is done at the kernel level and is not brought into the driver. ------------------------------------------------------------------- */ /* --------------------------------------------------------- verifyChannel returns the channel from the tty struct if it is valid. This serves as a sanity check. ------------------------------------------------------------- */ if ((ch = verifyChannel(tty)) == NULL) return 0; /* Make a pointer to the channel data structure found on the board. */ bc = ch->brdchan; size = ch->txbufsize; amountCopied = 0; spin_lock_irqsave(&epca_lock, flags); globalwinon(ch); head = readw(&bc->tin) & (size - 1); tail = readw(&bc->tout); if (tail != readw(&bc->tout)) tail = readw(&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; } 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_toio(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); writew(head, &bc->tin); if ((ch->statusflags & LOWWAIT) == 0) { ch->statusflags |= LOWWAIT; writeb(1, &bc->ilow); } memoff(ch); spin_unlock_irqrestore(&epca_lock, flags); return(amountCopied); } /* End pc_write */ /* ------------------ Begin pc_put_char ------------------------- */ static void pc_put_char(struct tty_struct *tty, unsigned char c) { /* Begin pc_put_char */ pc_write(tty, &c, 1); } /* 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; struct board_chan __iomem *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) { spin_lock_irqsave(&epca_lock, flags); globalwinon(ch); bc = ch->brdchan; head = readw(&bc->tin) & (ch->txbufsize - 1); tail = readw(&bc->tout); if (tail != readw(&bc->tout)) tail = readw(&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; writeb(1, &bc->ilow); } memoff(ch); spin_unlock_irqrestore(&epca_lock, 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; struct board_chan __iomem *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); spin_lock_irqsave(&epca_lock, flags); globalwinon(ch); bc = ch->brdchan; tail = readw(&bc->tout); head = readw(&bc->tin); ctail = readw(&ch->mailbox->cout); if (tail == head && readw(&ch->mailbox->cin) == ctail && readb(&bc->tbusy) == 0) chars = 0; else { /* Begin if some space on the card has been used */ head = readw(&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); spin_unlock_irqrestore(&epca_lock, 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; struct board_chan __iomem *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; spin_lock_irqsave(&epca_lock, flags); globalwinon(ch); bc = ch->brdchan; tail = readw(&bc->tout); /* Have FEP move tout pointer; effectively flushing transmit buffer */ fepcmd(ch, STOUT, (unsigned) tail, 0, 0, 0); memoff(ch); spin_unlock_irqrestore(&epca_lock, flags); wake_up_interruptible(&tty->write_wait); tty_wakeup(tty); } /* End pc_flush_buffer */ /* ------------------ Begin pc_flush_chars ---------------------- */ static void pc_flush_chars(struct tty_struct *tty) { /* Begin pc_flush_chars */ struct channel * ch; /* --------------------------------------------------------- verifyChannel returns the channel from the tty struct if it is valid. This serves as a sanity check. ------------------------------------------------------------- */ if ((ch = verifyChannel(tty)) != NULL) { unsigned long flags; spin_lock_irqsave(&epca_lock, flags); /* ---------------------------------------------------------------- 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); spin_unlock_irqrestore(&epca_lock, flags); } } /* End pc_flush_chars */ /* ------------------ Begin block_til_ready ---------------------- */ static int block_til_ready(struct tty_struct *tty, struct file *filp, struct channel *ch) { /* Begin block_til_ready */ DECLARE_WAITQUEUE(wait,current); int retval, do_clocal = 0; unsigned long flags; if (tty_hung_up_p(filp)) { if (ch->asyncflags & ASYNC_HUP_NOTIFY) retval = -EAGAIN; else retval = -ERESTARTSYS; return(retval); } /* ----------------------------------------------------------------- If the device is in the middle of being closed, then block until it's done, and then try again. -------------------------------------------------------------------- */ if (ch->asyncflags & ASYNC_CLOSING) { interruptible_sleep_on(&ch->close_wait); if (ch->asyncflags & ASYNC_HUP_NOTIFY) return -EAGAIN; else return -ERESTARTSYS; } if (filp->f_flags & O_NONBLOCK) { /* ----------------------------------------------------------------- If non-blocking mode is set, then make the check up front and then exit. -------------------------------------------------------------------- */ ch->asyncflags |= ASYNC_NORMAL_ACTIVE; return 0; } if (tty->termios->c_cflag & CLOCAL) do_clocal = 1; /* Block waiting for the carrier detect and the line to become free */ retval = 0; add_wait_queue(&ch->open_wait, &wait); spin_lock_irqsave(&epca_lock, flags); /* We dec count so that pc_close will know when to free things */ if (!tty_hung_up_p(filp)) ch->count--; ch->blocked_open++; while(1) { /* Begin forever while */ set_current_state(TASK_INTERRUPTIBLE); if (tty_hung_up_p(filp) || !(ch->asyncflags & ASYNC_INITIALIZED)) { if (ch->asyncflags & ASYNC_HUP_NOTIFY) retval = -EAGAIN; else retval = -ERESTARTSYS; break; } if (!(ch->asyncflags & ASYNC_CLOSING) && (do_clocal || (ch->imodem & ch->dcd))) break; if (signal_pending(current)) { retval = -ERESTARTSYS; break; } spin_unlock_irqrestore(&epca_lock, flags); /* --------------------------------------------------------------- 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(); spin_lock_irqsave(&epca_lock, flags); } /* End forever while */ current->state = TASK_RUNNING; remove_wait_queue(&ch->open_wait, &wait); if (!tty_hung_up_p(filp)) ch->count++; ch->blocked_open--; spin_unlock_irqrestore(&epca_lock, flags); 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; struct board_chan __iomem *bc; unsigned int head; line = tty->index; if (line < 0 || line >= nbdevs) return -ENODEV; ch = &digi_channels[line]; boardnum = ch->boardnum; /* Check status of board configured in system. */ /* ----------------------------------------------------------------- I check to see if the epca_setup routine detected an user error. It might be better to put this in pc_init, but for the moment it goes here. ---------------------------------------------------------------------- */ if (invalid_lilo_config) { if (setup_error_code & INVALID_BOARD_TYPE) printk(KERN_ERR "epca: pc_open: Invalid board type specified in kernel options.\n"); if (setup_error_code & INVALID_NUM_PORTS) printk(KERN_ERR "epca: pc_open: Invalid number of ports specified in kernel options.\n"); if (setup_error_code & INVALID_MEM_BASE) printk(KERN_ERR "epca: pc_open: Invalid board memory address specified in kernel options.\n"); if (setup_error_code & INVALID_PORT_BASE) printk(KERN_ERR "epca; pc_open: Invalid board port address specified in kernel options.\n"); if (setup_error_code & INVALID_BOARD_STATUS) printk(KERN_ERR "epca: pc_open: Invalid board status specified in kernel options.\n"); if (setup_error_code & INVALID_ALTPIN) printk(KERN_ERR "epca: pc_open: Invalid board altpin specified in kernel options;\n"); tty->driver_data = NULL; /* Mark this device as 'down' */ return -ENODEV; } if (boardnum >= num_cards || boards[boardnum].status == DISABLED) { tty->driver_data = NULL; /* Mark this device as 'down' */ return(-ENODEV); } if ((bc = ch->brdchan) == 0) { tty->driver_data = NULL; return -ENODEV; } spin_lock_irqsave(&epca_lock, flags); /* ------------------------------------------------------------------ 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. -------------------------------------------------------------------- */ globalwinon(ch); ch->statusflags = 0; /* Save boards current modem status */ ch->imodem = readb(&bc->mstat); /* ---------------------------------------------------------------- Set receive head and tail ptrs to each other. This indicates no data available to read. ----------------------------------------------------------------- */ head = readw(&bc->rin); writew(head, &bc->rout); /* 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); spin_unlock_irqrestore(&epca_lock, 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... --------------------------------------------------------------- */ spin_lock_irqsave(&epca_lock, flags); ch->tty = tty; globalwinon(ch); /* Enable Digi Data events */ writeb(1, &bc->idata); memoff(ch); spin_unlock_irqrestore(&epca_lock, flags); return 0; } /* End pc_open */ static int __init epca_module_init(void) { /* Begin init_module */ return pc_init(); } module_init(epca_module_init); static struct pci_driver epca_driver; static void __exit epca_module_exit(void) { int count, crd; struct board_info *bd; struct channel *ch; del_timer_sync(&epca_timer); if ((tty_unregister_driver(pc_driver)) || (tty_unregister_driver(pc_info))) { printk(KERN_WARNING "epca: cleanup_module failed to un-register tty driver\n"); return; } put_tty_driver(pc_driver); put_tty_driver(pc_info); for (crd = 0; crd < num_cards; crd++) { /* Begin for each card */ bd = &boards[crd]; if (!bd) { /* Begin sanity check */ printk(KERN_ERR "<Error> - Digi : cleanup_module failed\n"); return; } /* End sanity check */ ch = card_ptr[crd]; for (count = 0; count < bd->numports; count++, ch++) { /* Begin for each port */ if (ch) { if (ch->tty) tty_hangup(ch->tty); kfree(ch->tmp_buf); } } /* End for each port */ } /* End for each card */ pci_unregister_driver (&epca_driver); } module_exit(epca_module_exit); static struct tty_operations pc_ops = { .open = pc_open, .close = pc_close, .write = pc_write, .write_room = pc_write_room, .flush_buffer = pc_flush_buffer, .chars_in_buffer = pc_chars_in_buffer, .flush_chars = pc_flush_chars, .put_char = pc_put_char, .ioctl = pc_ioctl, .set_termios = pc_set_termios, .stop = pc_stop, .start = pc_start, .throttle = pc_throttle, .unthrottle = pc_unthrottle, .hangup = pc_hangup, }; static int info_open(struct tty_struct *tty, struct file * filp) { return 0; } static struct tty_operations info_ops = { .open = info_open, .ioctl = info_ioctl, }; /* ------------------ Begin pc_init ---------------------- */ static int __init pc_init(void) { /* Begin pc_init */ int crd; struct board_info *bd; unsigned char board_id = 0; int pci_boards_found, pci_count; pci_count = 0; pc_driver = alloc_tty_driver(MAX_ALLOC); if (!pc_driver) return -ENOMEM; pc_info = alloc_tty_driver(MAX_ALLOC); if (!pc_info) { put_tty_driver(pc_driver); return -ENOMEM; } /* ----------------------------------------------------------------------- If epca_setup has not been ran by LILO set num_cards to defaults; copy board structure defined by digiConfig into drivers board structure. Note : If LILO has ran epca_setup then epca_setup will handle defining num_cards as well as copying the data into the board structure. -------------------------------------------------------------------------- */ if (!liloconfig) { /* Begin driver has been configured via. epcaconfig */ nbdevs = NBDEVS; num_cards = NUMCARDS; memcpy((void *)&boards, (void *)&static_boards, (sizeof(struct board_info) * NUMCARDS)); } /* End driver has been configured via. epcaconfig */ /* ----------------------------------------------------------------- Note : If lilo was used to configure the driver and the ignore epcaconfig option was choosen (digiepca=2) then nbdevs and num_cards will equal 0 at this point. This is okay; PCI cards will still be picked up if detected. --------------------------------------------------------------------- */ /* ----------------------------------------------------------- Set up interrupt, we will worry about memory allocation in post_fep_init. --------------------------------------------------------------- */ printk(KERN_INFO "DIGI epca driver version %s loaded.\n",VERSION); /* ------------------------------------------------------------------ NOTE : This code assumes that the number of ports found in the boards array is correct. This could be wrong if the card in question is PCI (And therefore has no ports entry in the boards structure.) The rest of the information will be valid for PCI because the beginning of pc_init scans for PCI and determines i/o and base memory addresses. I am not sure if it is possible to read the number of ports supported by the card prior to it being booted (Since that is the state it is in when pc_init is run). Because it is not possible to query the number of supported ports until after the card has booted; we are required to calculate the card_ptrs as the card is is initialized (Inside post_fep_init). The negative thing about this approach is that digiDload's call to GET_INFO will have a bad port value. (Since this is called prior to post_fep_init.) --------------------------------------------------------------------- */ pci_boards_found = 0; if(num_cards < MAXBOARDS) pci_boards_found += init_PCI(); num_cards += pci_boards_found; pc_driver->owner = THIS_MODULE; pc_driver->name = "ttyD"; pc_driver->major = DIGI_MAJOR; pc_driver->minor_start = 0; pc_driver->type = TTY_DRIVER_TYPE_SERIAL; pc_driver->subtype = SERIAL_TYPE_NORMAL; pc_driver->init_termios = tty_std_termios; pc_driver->init_termios.c_iflag = 0; pc_driver->init_termios.c_oflag = 0; pc_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | CLOCAL | HUPCL; pc_driver->init_termios.c_lflag = 0; pc_driver->flags = TTY_DRIVER_REAL_RAW; tty_set_operations(pc_driver, &pc_ops); pc_info->owner = THIS_MODULE; pc_info->name = "digi_ctl"; pc_info->major = DIGIINFOMAJOR; pc_info->minor_start = 0; pc_info->type = TTY_DRIVER_TYPE_SERIAL; pc_info->subtype = SERIAL_TYPE_INFO; pc_info->init_termios = tty_std_termios; pc_info->init_termios.c_iflag = 0; pc_info->init_termios.c_oflag = 0; pc_info->init_termios.c_lflag = 0; pc_info->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL; pc_info->flags = TTY_DRIVER_REAL_RAW; tty_set_operations(pc_info, &info_ops); for (crd = 0; crd < num_cards; crd++) { /* Begin for each card */ /* ------------------------------------------------------------------ This is where the appropriate memory handlers for the hardware is set. Everything at runtime blindly jumps through these vectors. ---------------------------------------------------------------------- */ /* defined in epcaconfig.h */ bd = &boards[crd]; switch (bd->type) { /* Begin switch on bd->type {board type} */ case PCXEM: case EISAXEM: bd->memwinon = pcxem_memwinon ; bd->memwinoff = pcxem_memwinoff ; bd->globalwinon = pcxem_globalwinon ; bd->txwinon = pcxem_txwinon ; bd->rxwinon = pcxem_rxwinon ; bd->memoff = pcxem_memoff ; bd->assertgwinon = dummy_assertgwinon; bd->assertmemoff = dummy_assertmemoff; break; case PCIXEM: case PCIXRJ: case PCIXR: bd->memwinon = dummy_memwinon; bd->memwinoff = dummy_memwinoff; bd->globalwinon = dummy_globalwinon; bd->txwinon = dummy_txwinon; bd->rxwinon = dummy_rxwinon; bd->memoff = dummy_memoff; bd->assertgwinon = dummy_assertgwinon; bd->assertmemoff = dummy_assertmemoff; break; case PCXE: case PCXEVE: bd->memwinon = pcxe_memwinon; bd->memwinoff = pcxe_memwinoff; bd->globalwinon = pcxe_globalwinon; bd->txwinon = pcxe_txwinon; bd->rxwinon = pcxe_rxwinon; bd->memoff = pcxe_memoff; bd->assertgwinon = dummy_assertgwinon; bd->assertmemoff = dummy_assertmemoff; break; case PCXI: case PC64XE: bd->memwinon = pcxi_memwinon; bd->memwinoff = pcxi_memwinoff; bd->globalwinon = pcxi_globalwinon; bd->txwinon = pcxi_txwinon; bd->rxwinon = pcxi_rxwinon; bd->memoff = pcxi_memoff; bd->assertgwinon = pcxi_assertgwinon; bd->assertmemoff = pcxi_assertmemoff; break; default: break; } /* End switch on bd->type */ /* --------------------------------------------------------------- Some cards need a memory segment to be defined for use in transmit and receive windowing operations. These boards are listed in the below switch. In the case of the XI the amount of memory on the board is variable so the memory_seg is also variable. This code determines what they segment should be. ----------------------------------------------------------------- */ switch (bd->type) { /* Begin switch on bd->type {board type} */ case PCXE: case PCXEVE: case PC64XE: bd->memory_seg = 0xf000; break; case PCXI: board_id = inb((int)bd->port); if ((board_id & 0x1) == 0x1) { /* Begin it's an XI card */ /* Is it a 64K board */ if ((board_id & 0x30) == 0) bd->memory_seg = 0xf000; /* Is it a 128K board */ if ((board_id & 0x30) == 0x10) bd->memory_seg = 0xe000; /* Is is a 256K board */ if ((board_id & 0x30) == 0x20) bd->memory_seg = 0xc000; /* Is it a 512K board */ if ((board_id & 0x30) == 0x30) bd->memory_seg = 0x8000; } else printk(KERN_ERR "epca: Board at 0x%x doesn't appear to be an XI\n",(int)bd->port); break; } /* End switch on bd->type */ } /* End for each card */ if (tty_register_driver(pc_driver)) panic("Couldn't register Digi PC/ driver"); if (tty_register_driver(pc_info)) panic("Couldn't register Digi PC/ info "); /* ------------------------------------------------------------------- Start up the poller to check for events on all enabled boards ---------------------------------------------------------------------- */ init_timer(&epca_timer); epca_timer.function = epcapoll; mod_timer(&epca_timer, jiffies + HZ/25); return 0; } /* End pc_init */ /* ------------------ Begin post_fep_init ---------------------- */ static void post_fep_init(unsigned int crd) { /* Begin post_fep_init */ int i; void __iomem *memaddr; struct global_data __iomem *gd; struct board_info *bd; struct board_chan __iomem *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) { /* 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)). ------------------------------------------------------------------------ */ /* PCI cards are already remapped at this point ISA are not */ bd->numports = readw(bd->re_map_membase + XEMPORTS); epcaassert(bd->numports <= 64,"PCI returned a invalid number of ports"); nbdevs += (bd->numports); } else { /* Fix up the mappings for ISA/EISA etc */ /* FIXME: 64K - can we be smarter ? */ bd->re_map_membase = ioremap(bd->membase, 0x10000); } 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 = bd->re_map_membase; /* ----------------------------------------------------------------- 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 = 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 = 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) && (readw(memaddr + XEPORTS) < 3)) shrinkmem = 1; if (bd->type < PCIXEM) if (!request_region((int)bd->port, 4, board_desc[bd->type])) return; memwinon(bd, 0); /* -------------------------------------------------------------------- Remember ch is the main drivers channels structure, while bc is the cards channel structure. ------------------------------------------------------------------------ */ /* For every port on the card do ..... */ for (i = 0; i < bd->numports; i++, ch++, bc++) { /* Begin for each port */ unsigned long flags; u16 tseg, rseg; ch->brdchan = bc; ch->mailbox = gd; INIT_WORK(&ch->tqueue, do_softint, ch); ch->board = &boards[crd]; spin_lock_irqsave(&epca_lock, flags); switch (bd->type) { /* ---------------------------------------------------------------- Since some of the boards use different bitmaps for their control signals we cannot hard code these values and retain portability. We virtualize this data here. ------------------------------------------------------------------- */ case EISAXEM: case PCXEM: case PCIXEM: case PCIXRJ: case PCIXR: ch->m_rts = 0x02 ; ch->m_dcd = 0x80 ; ch->m_dsr = 0x20 ; ch->m_cts = 0x10 ; ch->m_ri = 0x40 ; ch->m_dtr = 0x01 ; break; case PCXE: case PCXEVE: case PCXI: case PC64XE: ch->m_rts = 0x02 ; ch->m_dcd = 0x08 ; ch->m_dsr = 0x10 ; ch->m_cts = 0x20 ; ch->m_ri = 0x40 ; ch->m_dtr = 0x80 ; break; } /* End switch bd->type */ if (boards[crd].altpin) { ch->dsr = ch->m_dcd; ch->dcd = ch->m_dsr; ch->digiext.digi_flags |= DIGI_ALTPIN; } else { ch->dcd = ch->m_dcd; ch->dsr = ch->m_dsr; } ch->boardnum = crd; ch->channelnum = i; ch->magic = EPCA_MAGIC; ch->tty = NULL; if (shrinkmem) { fepcmd(ch, SETBUFFER, 32, 0, 0, 0); shrinkmem = 0; } tseg = readw(&bc->tseg); rseg = readw(&bc->rseg); switch (bd->type) { case PCIXEM: case PCIXRJ: case PCIXR: /* Cover all the 2MEG cards */ ch->txptr = memaddr + ((tseg << 4) & 0x1fffff); ch->rxptr = memaddr + ((rseg << 4) & 0x1fffff); ch->txwin = FEPWIN | (tseg >> 11); ch->rxwin = FEPWIN | (rseg >> 11); break; case PCXEM: case EISAXEM: /* Cover all the 32K windowed cards */ /* Mask equal to window size - 1 */ ch->txptr = memaddr + ((tseg << 4) & 0x7fff); ch->rxptr = memaddr + ((rseg << 4) & 0x7fff); ch->txwin = FEPWIN | (tseg >> 11); ch->rxwin = FEPWIN | (rseg >> 11); break; case PCXEVE: case PCXE: ch->txptr = memaddr + (((tseg - bd->memory_seg) << 4) & 0x1fff); ch->txwin = FEPWIN | ((tseg - bd->memory_seg) >> 9); ch->rxptr = memaddr + (((rseg - bd->memory_seg) << 4) & 0x1fff); ch->rxwin = FEPWIN | ((rseg - bd->memory_seg) >>9 ); break; case PCXI: case PC64XE: ch->txptr = memaddr + ((tseg - bd->memory_seg) << 4); ch->rxptr = memaddr + ((rseg - bd->memory_seg) << 4); ch->txwin = ch->rxwin = 0; break; } /* End switch bd->type */ ch->txbufhead = 0; ch->txbufsize = readw(&bc->tmax) + 1; ch->rxbufhead = 0; ch->rxbufsize = readw(&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); writew(100, &bc->edelay); writeb(1, &bc->idata); ch->startc = readb(&bc->startc); ch->stopc = readb(&bc->stopc); ch->startca = readb(&bc->startca); ch->stopca = readb(&bc->stopca); ch->fepcflag = 0; ch->fepiflag = 0; ch->fepoflag = 0; ch->fepstartc = 0; ch->fepstopc = 0; ch->fepstartca = 0; ch->fepstopca = 0; ch->close_delay = 50; ch->count = 0; ch->blocked_open = 0; init_waitqueue_head(&ch->open_wait); init_waitqueue_head(&ch->close_wait); spin_unlock_irqrestore(&epca_lock, flags); ch->tmp_buf = kmalloc(ch->txbufsize,GFP_KERNEL); if (!ch->tmp_buf) { printk(KERN_ERR "POST FEP INIT : kmalloc failed for port 0x%x\n",i); release_region((int)bd->port, 4); while(i-- > 0) kfree((ch--)->tmp_buf); return; } else memset((void *)ch->tmp_buf,0,ch->txbufsize); } /* End for each port */ printk(KERN_INFO "Digi PC/Xx Driver V%s: %s I/O = 0x%lx Mem = 0x%lx Ports = %d\n", VERSION, board_desc[bd->type], (long)bd->port, (long)bd->membase, bd->numports); 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. ----------------------------------------------------------------------- */ 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. ---------------------------------------------------------------- */ spin_lock_irqsave(&epca_lock, flags); assertmemoff(ch); globalwinon(ch); /* --------------------------------------------------------------- In this case head and tail actually refer to the event queue not the transmit or receive queue. ------------------------------------------------------------------- */ head = readw(&ch->mailbox->ein); tail = readw(&ch->mailbox->eout); /* If head isn't equal to tail we have an event */ if (head != tail) doevent(crd); memoff(ch); spin_unlock_irqrestore(&epca_lock, flags); } /* End for each card */ mod_timer(&epca_timer, jiffies + (HZ / 25)); } /* End epcapoll */ /* --------------------- Begin doevent ------------------------ */ static void doevent(int crd) { /* Begin doevent */ void __iomem *eventbuf; struct channel *ch, *chan0; static struct tty_struct *tty; struct board_info *bd; struct board_chan __iomem *bc; unsigned int tail, head; int event, channel; 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 = readw(&chan0->mailbox->eout)) != (head = readw(&chan0->mailbox->ein))) { /* Begin while something in event queue */ assertgwinon(chan0); eventbuf = bd->re_map_membase + tail + ISTART; /* Get the channel the event occurred on */ channel = readb(eventbuf); /* Get the actual event code that occurred */ event = readb(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 = readb(eventbuf + 2); lstat = readb(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_insert_flip_char(tty, 0, TTY_BREAK); tty_schedule_flip(tty); } else if (event & LOWTX_IND) { /* Begin LOWTX_IND */ if (ch->statusflags & LOWWAIT) { /* Begin if LOWWAIT */ ch->statusflags &= ~LOWWAIT; tty_wakeup(tty); wake_up_interruptible(&tty->write_wait); } /* End if LOWWAIT */ } else if (event & EMPTYTX_IND) { /* Begin EMPTYTX_IND */ /* This event is generated by setup_empty_event */ ch->statusflags &= ~TXBUSY; if (ch->statusflags & EMPTYWAIT) { /* Begin if EMPTYWAIT */ ch->statusflags &= ~EMPTYWAIT; tty_wakeup(tty); wake_up_interruptible(&tty->write_wait); } /* End if EMPTYWAIT */ } /* End EMPTYTX_IND */ } /* End if valid tty */ next: globalwinon(ch); BUG_ON(!bc); writew(1, &bc->idata); writew((tail + 4) & (IMAX - ISTART - 4), &chan0->mailbox->eout); 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 __iomem *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 = readw(&ch->mailbox->cin); /* cmdStart is a base address */ cmdStart = readw(&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 + readw(&ch->mailbox->cmax)); memaddr = ch->board->re_map_membase; if (head >= (cmdMax - cmdStart) || (head & 03)) { printk(KERN_ERR "line %d: Out of range, cmd = %x, head = %x\n", __LINE__, cmd, head); printk(KERN_ERR "line %d: Out of range, cmdMax = %x, cmdStart = %x\n", __LINE__, cmdMax, cmdStart); return; } if (bytecmd) { writeb(cmd, memaddr + head + cmdStart + 0); writeb(ch->channelnum, memaddr + head + cmdStart + 1); /* Below word_or_byte is bits to set */ writeb(word_or_byte, memaddr + head + cmdStart + 2); /* Below byte2 is bits to reset */ writeb(byte2, memaddr + head + cmdStart + 3); } else { writeb(cmd, memaddr + head + cmdStart + 0); writeb(ch->channelnum, memaddr + head + cmdStart + 1); writeb(word_or_byte, memaddr + head + cmdStart + 2); } head = (head + 4) & (cmdMax - cmdStart - 4); writew(head, &ch->mailbox->cin); count = FEPTIMEOUT; for (;;) { /* Begin forever loop */ count--; if (count == 0) { printk(KERN_ERR "<Error> - Fep not responding in fepcmd()\n"); return; } head = readw(&ch->mailbox->cin); cmdTail = readw(&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; 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 ----------------------- */ /* Caller must hold the locks */ static void epcaparam(struct tty_struct *tty, struct channel *ch) { /* Begin epcaparam */ unsigned int cmdHead; struct termios *ts; struct board_chan __iomem *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 = readw(&bc->rin); writew(cmdHead, &bc->rout); cmdHead = readw(&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; } 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) ch->asyncflags &= ~ASYNC_CHECK_CD; else ch->asyncflags |= ASYNC_CHECK_CD; mval = ch->m_dtr | ch->m_rts; } /* End CBAUD not detected */ iflag = termios2digi_i(ch, ts->c_iflag); /* Check input mode flags */ if (iflag != ch->fepiflag) { ch->fepiflag = iflag; /* --------------------------------------------------------------- Command sets channels iflag structure on the board. Such things as input soft flow control, handling of parity errors, and break handling are all set here. ------------------------------------------------------------------- */ /* break handling, parity handling, input stripping, flow control chars */ fepcmd(ch, SETIFLAGS, (unsigned int) ch->fepiflag, 0, 0, 0); } /* --------------------------------------------------------------- Set the board mint value for this channel. This will cause hardware events to be generated each time the DCD signal (Described in mint) changes. ------------------------------------------------------------------- */ writeb(ch->dcd, &bc->mint); if ((ts->c_cflag & CLOCAL) || (ch->digiext.digi_flags & DIGI_FORCEDCD)) if (ch->digiext.digi_flags & DIGI_FORCEDCD) writeb(0, &bc->mint); ch->imodem = readb(&bc->mstat); hflow = termios2digi_h(ch, ts->c_cflag); if (hflow != ch->hflow) { ch->hflow = hflow; /* -------------------------------------------------------------- Hard flow control has been selected but the board is not using it. Activate hard flow control now. ----------------------------------------------------------------- */ fepcmd(ch, SETHFLOW, hflow, 0xff, 0, 1); } mval ^= ch->modemfake & (mval ^ ch->modem); if (ch->omodem ^ mval) { ch->omodem = mval; /* -------------------------------------------------------------- The below command sets the DTR and RTS mstat structure. If hard flow control is NOT active these changes will drive the output of the actual DTR and RTS lines. If hard flow control is active, the changes will be saved in the mstat structure and only asserted when hard flow control is turned off. ----------------------------------------------------------------- */ /* First reset DTR & RTS; then set them */ fepcmd(ch, SETMODEM, 0, ((ch->m_dtr)|(ch->m_rts)), 0, 1); fepcmd(ch, SETMODEM, mval, 0, 0, 1); } if (ch->startc != ch->fepstartc || ch->stopc != ch->fepstopc) { ch->fepstartc = ch->startc; ch->fepstopc = ch->stopc; /* ------------------------------------------------------------ The XON / XOFF characters have changed; propagate these changes to the card. --------------------------------------------------------------- */ fepcmd(ch, SONOFFC, ch->fepstartc, ch->fepstopc, 0, 1); } if (ch->startca != ch->fepstartca || ch->stopca != ch->fepstopca) { ch->fepstartca = ch->startca; ch->fepstopca = ch->stopca; /* --------------------------------------------------------------- Similar to the above, this time the auxilarly XON / XOFF characters have changed; propagate these changes to the card. ------------------------------------------------------------------ */ fepcmd(ch, SAUXONOFFC, ch->fepstartca, ch->fepstopca, 0, 1); } } /* End epcaparam */ /* --------------------- Begin receive_data ----------------------- */ /* Caller holds lock */ static void receive_data(struct channel *ch) { /* Begin receive_data */ unchar *rptr; struct termios *ts = NULL; struct tty_struct *tty; struct board_chan __iomem *bc; int dataToRead, wrapgap, bytesAvailable; unsigned int tail, head; unsigned int wrapmask; /* --------------------------------------------------------------- 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; BUG_ON(!bc); 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 = readw(&bc->rin); head &= wrapmask; tail = readw(&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)) { writew(head, &bc->rout); return; } if (tty_buffer_request_room(tty, bytesAvailable + 1) == 0) return; if (readb(&bc->orun)) { writeb(0, &bc->orun); printk(KERN_WARNING "epca; overrun! DigiBoard device %s\n",tty->name); tty_insert_flip_char(tty, 0, TTY_OVERRUN); } rxwinon(ch); 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 ----------------------------------------------------------------- */ dataToRead = tty_prepare_flip_string(tty, &rptr, dataToRead); if (dataToRead == 0) break; /* --------------------------------------------------------------- Move data read from our card into the line disciplines buffer for translation if necessary. ------------------------------------------------------------------ */ memcpy_fromio(rptr, ch->rxptr + tail, dataToRead); tail = (tail + dataToRead) & wrapmask; bytesAvailable -= dataToRead; } /* End while there is data on the card */ globalwinon(ch); writew(tail, &bc->rout); /* Must be called with global data */ tty_schedule_flip(ch->tty); return; } /* End receive_data */ static int info_ioctl(struct tty_struct *tty, struct file * file, unsigned int cmd, unsigned long arg) { switch (cmd) { /* Begin switch cmd */ case DIGI_GETINFO: { /* Begin case DIGI_GETINFO */ struct digi_info di ; int brd; if(get_user(brd, (unsigned int __user *)arg)) return -EFAULT; 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 ; /* Legacy fixups - just move along nothing to see */ di.port = (unsigned char *)boards[brd].port ; di.membase = (unsigned char *)boards[brd].membase ; if (copy_to_user((void __user *)arg, &di, sizeof (di))) return -EFAULT; break; } /* End case DIGI_GETINFO */ case DIGI_POLLER: { /* Begin case DIGI_POLLER */ int brd = arg & 0xff000000 >> 16 ; unsigned char state = arg & 0xff ; if (brd < 0 || brd >= num_cards) { printk(KERN_ERR "epca: 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 -ENOTTY; } /* End switch cmd */ return (0) ; } /* --------------------- Begin pc_ioctl ----------------------- */ static int pc_tiocmget(struct tty_struct *tty, struct file *file) { struct channel *ch = (struct channel *) tty->driver_data; struct board_chan __iomem *bc; unsigned int mstat, mflag = 0; unsigned long flags; if (ch) bc = ch->brdchan; else return -EINVAL; spin_lock_irqsave(&epca_lock, flags); globalwinon(ch); mstat = readb(&bc->mstat); memoff(ch); spin_unlock_irqrestore(&epca_lock, flags); if (mstat & ch->m_dtr) mflag |= TIOCM_DTR; if (mstat & ch->m_rts) mflag |= TIOCM_RTS; if (mstat & ch->m_cts) mflag |= TIOCM_CTS; if (mstat & ch->dsr) mflag |= TIOCM_DSR; if (mstat & ch->m_ri) mflag |= TIOCM_RI; if (mstat & ch->dcd) mflag |= TIOCM_CD; return mflag; } static int pc_tiocmset(struct tty_struct *tty, struct file *file, unsigned int set, unsigned int clear) { struct channel *ch = (struct channel *) tty->driver_data; unsigned long flags; if (!ch) return -EINVAL; spin_lock_irqsave(&epca_lock, flags); /* * I think this modemfake stuff is broken. It doesn't * correctly reflect the behaviour desired by the TIOCM* * ioctls. Therefore this is probably broken. */ if (set & TIOCM_RTS) { ch->modemfake |= ch->m_rts; ch->modem |= ch->m_rts; } if (set & TIOCM_DTR) { ch->modemfake |= ch->m_dtr; ch->modem |= ch->m_dtr; } if (clear & TIOCM_RTS) { ch->modemfake |= ch->m_rts; ch->modem &= ~ch->m_rts; } if (clear & TIOCM_DTR) { ch->modemfake |= ch->m_dtr; ch->modem &= ~ch->m_dtr; } globalwinon(ch); /* -------------------------------------------------------------- The below routine generally sets up parity, baud, flow control issues, etc.... It effect both control flags and input flags. ------------------------------------------------------------------ */ epcaparam(tty,ch); memoff(ch); spin_unlock_irqrestore(&epca_lock, flags); return 0; } static int pc_ioctl(struct tty_struct *tty, struct file * file, unsigned int cmd, unsigned long arg) { /* Begin pc_ioctl */ digiflow_t dflow; int retval; unsigned long flags; unsigned int mflag, mstat; unsigned char startc, stopc; struct board_chan __iomem *bc; struct channel *ch = (struct channel *) tty->driver_data; void __user *argp = (void __user *)arg; if (ch) bc = ch->brdchan; else return -EINVAL; /* ------------------------------------------------------------------- For POSIX compliance we need to add more ioctls. See tty_ioctl.c in /usr/src/linux/drivers/char for a good example. In particular think about adding TCSETAF, TCSETAW, TCSETA, TCSETSF, TCSETSW, TCSETS. ---------------------------------------------------------------------- */ switch (cmd) { /* Begin switch cmd */ case TCGETS: if (copy_to_user(argp, tty->termios, sizeof(struct termios))) return -EFAULT; return 0; case TCGETA: return get_termio(tty, argp); case TCSBRK: /* SVID version: non-zero arg --> no break */ retval = tty_check_change(tty); if (retval) return retval; /* Setup an event to indicate when the transmit buffer empties */ spin_lock_irqsave(&epca_lock, flags); setup_empty_event(tty,ch); spin_unlock_irqrestore(&epca_lock, flags); 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 */ spin_lock_irqsave(&epca_lock, flags); setup_empty_event(tty,ch); spin_unlock_irqrestore(&epca_lock, flags); tty_wait_until_sent(tty, 0); digi_send_break(ch, arg ? arg*(HZ/10) : HZ/4); return 0; case TIOCGSOFTCAR: if (put_user(C_CLOCAL(tty)?1:0, (unsigned long __user *)arg)) return -EFAULT; return 0; case TIOCSSOFTCAR: { unsigned int value; if (get_user(value, (unsigned __user *)argp)) return -EFAULT; tty->termios->c_cflag = ((tty->termios->c_cflag & ~CLOCAL) | (value ? CLOCAL : 0)); return 0; } case TIOCMODG: mflag = pc_tiocmget(tty, file); if (put_user(mflag, (unsigned long __user *)argp)) return -EFAULT; break; case TIOCMODS: if (get_user(mstat, (unsigned __user *)argp)) return -EFAULT; return pc_tiocmset(tty, file, mstat, ~mstat); case TIOCSDTR: spin_lock_irqsave(&epca_lock, flags); ch->omodem |= ch->m_dtr; globalwinon(ch); fepcmd(ch, SETMODEM, ch->m_dtr, 0, 10, 1); memoff(ch); spin_unlock_irqrestore(&epca_lock, flags); break; case TIOCCDTR: spin_lock_irqsave(&epca_lock, flags); ch->omodem &= ~ch->m_dtr; globalwinon(ch); fepcmd(ch, SETMODEM, 0, ch->m_dtr, 10, 1); memoff(ch); spin_unlock_irqrestore(&epca_lock, flags); break; case DIGI_GETA: if (copy_to_user(argp, &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 */ spin_lock_irqsave(&epca_lock, flags); setup_empty_event(tty,ch); spin_unlock_irqrestore(&epca_lock, flags); tty_wait_until_sent(tty, 0); } else { /* ldisc lock already held in ioctl */ if (tty->ldisc.flush_buffer) tty->ldisc.flush_buffer(tty); } /* Fall Thru */ case DIGI_SETA: if (copy_from_user(&ch->digiext, argp, 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; } spin_lock_irqsave(&epca_lock, flags); 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); spin_unlock_irqrestore(&epca_lock, flags); break; case DIGI_GETFLOW: case DIGI_GETAFLOW: spin_lock_irqsave(&epca_lock, flags); globalwinon(ch); if (cmd == DIGI_GETFLOW) { dflow.startc = readb(&bc->startc); dflow.stopc = readb(&bc->stopc); } else { dflow.startc = readb(&bc->startca); dflow.stopc = readb(&bc->stopca); } memoff(ch); spin_unlock_irqrestore(&epca_lock, flags); if (copy_to_user(argp, &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, argp, sizeof(dflow))) return -EFAULT; if (dflow.startc != startc || dflow.stopc != stopc) { /* Begin if setflow toggled */ spin_lock_irqsave(&epca_lock, flags); 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); spin_unlock_irqrestore(&epca_lock, 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 */ spin_lock_irqsave(&epca_lock, flags); globalwinon(ch); epcaparam(tty, ch); memoff(ch); spin_unlock_irqrestore(&epca_lock, flags); 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); } /* 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; } /* End if clear_bit */ } } /* End EPCA_MAGIC */ } /* 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. ------------------------------------------------------------- */


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