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linux-sg2042/drivers/char/rio/riotty.c

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/*
** -----------------------------------------------------------------------------
**
** Perle Specialix driver for Linux
** Ported from existing RIO Driver for SCO sources.
*
* (C) 1990 - 2000 Specialix International Ltd., Byfleet, Surrey, UK.
*
* 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.
**
** Module : riotty.c
** SID : 1.3
** Last Modified : 11/6/98 10:33:47
** Retrieved : 11/6/98 10:33:50
**
** ident @(#)riotty.c 1.3
**
** -----------------------------------------------------------------------------
*/
#ifdef SCCS_LABELS
static char *_riotty_c_sccs_ = "@(#)riotty.c 1.3";
#endif
#define __EXPLICIT_DEF_H__
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/tty.h>
#include <linux/string.h>
#include <asm/io.h>
#include <asm/system.h>
#include <asm/string.h>
#include <asm/semaphore.h>
#include <asm/uaccess.h>
#include <linux/termios.h>
#include <linux/serial.h>
#include <linux/generic_serial.h>
#include "linux_compat.h"
#include "rio_linux.h"
#include "pkt.h"
#include "daemon.h"
#include "rio.h"
#include "riospace.h"
#include "cmdpkt.h"
#include "map.h"
#include "rup.h"
#include "port.h"
#include "riodrvr.h"
#include "rioinfo.h"
#include "func.h"
#include "errors.h"
#include "pci.h"
#include "parmmap.h"
#include "unixrup.h"
#include "board.h"
#include "host.h"
#include "phb.h"
#include "link.h"
#include "cmdblk.h"
#include "route.h"
#include "cirrus.h"
#include "rioioctl.h"
#include "param.h"
static void RIOClearUp(struct Port *PortP);
/* Below belongs in func.h */
int RIOShortCommand(struct rio_info *p, struct Port *PortP, int command, int len, int arg);
extern struct rio_info *p;
int riotopen(struct tty_struct *tty, struct file *filp)
{
unsigned int SysPort;
int repeat_this = 250;
struct Port *PortP; /* pointer to the port structure */
unsigned long flags;
int retval = 0;
func_enter();
/* Make sure driver_data is NULL in case the rio isn't booted jet. Else gs_close
is going to oops.
*/
tty->driver_data = NULL;
SysPort = rio_minor(tty);
if (p->RIOFailed) {
rio_dprintk(RIO_DEBUG_TTY, "System initialisation failed\n");
func_exit();
return -ENXIO;
}
rio_dprintk(RIO_DEBUG_TTY, "port open SysPort %d (mapped:%d)\n", SysPort, p->RIOPortp[SysPort]->Mapped);
/*
** Validate that we have received a legitimate request.
** Currently, just check that we are opening a port on
** a host card that actually exists, and that the port
** has been mapped onto a host.
*/
if (SysPort >= RIO_PORTS) { /* out of range ? */
rio_dprintk(RIO_DEBUG_TTY, "Illegal port number %d\n", SysPort);
func_exit();
return -ENXIO;
}
/*
** Grab pointer to the port stucture
*/
PortP = p->RIOPortp[SysPort]; /* Get control struc */
rio_dprintk(RIO_DEBUG_TTY, "PortP: %p\n", PortP);
if (!PortP->Mapped) { /* we aren't mapped yet! */
/*
** The system doesn't know which RTA this port
** corresponds to.
*/
rio_dprintk(RIO_DEBUG_TTY, "port not mapped into system\n");
func_exit();
return -ENXIO;
}
tty->driver_data = PortP;
PortP->gs.tty = tty;
PortP->gs.count++;
rio_dprintk(RIO_DEBUG_TTY, "%d bytes in tx buffer\n", PortP->gs.xmit_cnt);
retval = gs_init_port(&PortP->gs);
if (retval) {
PortP->gs.count--;
return -ENXIO;
}
/*
** If the host hasn't been booted yet, then
** fail
*/
if ((PortP->HostP->Flags & RUN_STATE) != RC_RUNNING) {
rio_dprintk(RIO_DEBUG_TTY, "Host not running\n");
func_exit();
return -ENXIO;
}
/*
** If the RTA has not booted yet and the user has choosen to block
** until the RTA is present then we must spin here waiting for
** the RTA to boot.
*/
/* I find the above code a bit hairy. I find the below code
easier to read and shorter. Now, if it works too that would
be great... -- REW
*/
rio_dprintk(RIO_DEBUG_TTY, "Checking if RTA has booted... \n");
while (!(PortP->HostP->Mapping[PortP->RupNum].Flags & RTA_BOOTED)) {
if (!PortP->WaitUntilBooted) {
rio_dprintk(RIO_DEBUG_TTY, "RTA never booted\n");
func_exit();
return -ENXIO;
}
/* Under Linux you'd normally use a wait instead of this
busy-waiting. I'll stick with the old implementation for
now. --REW
*/
if (RIODelay(PortP, HUNDRED_MS) == RIO_FAIL) {
rio_dprintk(RIO_DEBUG_TTY, "RTA_wait_for_boot: EINTR in delay \n");
func_exit();
return -EINTR;
}
if (repeat_this-- <= 0) {
rio_dprintk(RIO_DEBUG_TTY, "Waiting for RTA to boot timeout\n");
func_exit();
return -EIO;
}
}
rio_dprintk(RIO_DEBUG_TTY, "RTA has been booted\n");
rio_spin_lock_irqsave(&PortP->portSem, flags);
if (p->RIOHalted) {
goto bombout;
}
/*
** If the port is in the final throws of being closed,
** we should wait here (politely), waiting
** for it to finish, so that it doesn't close us!
*/
while ((PortP->State & RIO_CLOSING) && !p->RIOHalted) {
rio_dprintk(RIO_DEBUG_TTY, "Waiting for RIO_CLOSING to go away\n");
if (repeat_this-- <= 0) {
rio_dprintk(RIO_DEBUG_TTY, "Waiting for not idle closed broken by signal\n");
RIOPreemptiveCmd(p, PortP, FCLOSE);
retval = -EINTR;
goto bombout;
}
rio_spin_unlock_irqrestore(&PortP->portSem, flags);
if (RIODelay(PortP, HUNDRED_MS) == RIO_FAIL) {
rio_spin_lock_irqsave(&PortP->portSem, flags);
retval = -EINTR;
goto bombout;
}
rio_spin_lock_irqsave(&PortP->portSem, flags);
}
if (!PortP->Mapped) {
rio_dprintk(RIO_DEBUG_TTY, "Port unmapped while closing!\n");
rio_spin_unlock_irqrestore(&PortP->portSem, flags);
retval = -ENXIO;
func_exit();
return retval;
}
if (p->RIOHalted) {
goto bombout;
}
/*
** 15.10.1998 ARG - ESIL 0761 part fix
** RIO has it's own CTSFLOW and RTSFLOW flags in 'Config' in the port structure,
** we need to make sure that the flags are clear when the port is opened.
*/
/* Uh? Suppose I turn these on and then another process opens
the port again? The flags get cleared! Not good. -- REW */
if (!(PortP->State & (RIO_LOPEN | RIO_MOPEN))) {
PortP->Config &= ~(RIO_CTSFLOW | RIO_RTSFLOW);
}
if (!(PortP->firstOpen)) { /* First time ? */
rio_dprintk(RIO_DEBUG_TTY, "First open for this port\n");
PortP->firstOpen++;
PortP->CookMode = 0; /* XXX RIOCookMode(tp); */
PortP->InUse = NOT_INUSE;
/* Tentative fix for bug PR27. Didn't work. */
/* PortP->gs.xmit_cnt = 0; */
rio_spin_unlock_irqrestore(&PortP->portSem, flags);
/* Someone explain to me why this delay/config is
here. If I read the docs correctly the "open"
command piggybacks the parameters immediately.
-- REW */
RIOParam(PortP, OPEN, 1, OK_TO_SLEEP); /* Open the port */
rio_spin_lock_irqsave(&PortP->portSem, flags);
/*
** wait for the port to be not closed.
*/
while (!(PortP->PortState & PORT_ISOPEN) && !p->RIOHalted) {
rio_dprintk(RIO_DEBUG_TTY, "Waiting for PORT_ISOPEN-currently %x\n", PortP->PortState);
rio_spin_unlock_irqrestore(&PortP->portSem, flags);
if (RIODelay(PortP, HUNDRED_MS) == RIO_FAIL) {
rio_dprintk(RIO_DEBUG_TTY, "Waiting for open to finish broken by signal\n");
RIOPreemptiveCmd(p, PortP, FCLOSE);
func_exit();
return -EINTR;
}
rio_spin_lock_irqsave(&PortP->portSem, flags);
}
if (p->RIOHalted) {
retval = -EIO;
bombout:
/* RIOClearUp( PortP ); */
rio_spin_unlock_irqrestore(&PortP->portSem, flags);
return retval;
}
rio_dprintk(RIO_DEBUG_TTY, "PORT_ISOPEN found\n");
}
rio_dprintk(RIO_DEBUG_TTY, "Modem - test for carrier\n");
/*
** ACTION
** insert test for carrier here. -- ???
** I already see that test here. What's the deal? -- REW
*/
if ((PortP->gs.tty->termios->c_cflag & CLOCAL) || (PortP->ModemState & MSVR1_CD)) {
rio_dprintk(RIO_DEBUG_TTY, "open(%d) Modem carr on\n", SysPort);
/*
tp->tm.c_state |= CARR_ON;
wakeup((caddr_t) &tp->tm.c_canq);
*/
PortP->State |= RIO_CARR_ON;
wake_up_interruptible(&PortP->gs.open_wait);
} else { /* no carrier - wait for DCD */
/*
while (!(PortP->gs.tty->termios->c_state & CARR_ON) &&
!(filp->f_flags & O_NONBLOCK) && !p->RIOHalted )
*/
while (!(PortP->State & RIO_CARR_ON) && !(filp->f_flags & O_NONBLOCK) && !p->RIOHalted) {
rio_dprintk(RIO_DEBUG_TTY, "open(%d) sleeping for carr on\n", SysPort);
/*
PortP->gs.tty->termios->c_state |= WOPEN;
*/
PortP->State |= RIO_WOPEN;
rio_spin_unlock_irqrestore(&PortP->portSem, flags);
if (RIODelay(PortP, HUNDRED_MS) == RIO_FAIL) {
/*
** ACTION: verify that this is a good thing
** to do here. -- ???
** I think it's OK. -- REW
*/
rio_dprintk(RIO_DEBUG_TTY, "open(%d) sleeping for carr broken by signal\n", SysPort);
RIOPreemptiveCmd(p, PortP, FCLOSE);
/*
tp->tm.c_state &= ~WOPEN;
*/
PortP->State &= ~RIO_WOPEN;
rio_spin_unlock_irqrestore(&PortP->portSem, flags);
func_exit();
return -EINTR;
}
}
PortP->State &= ~RIO_WOPEN;
}
if (p->RIOHalted)
goto bombout;
rio_dprintk(RIO_DEBUG_TTY, "Setting RIO_MOPEN\n");
PortP->State |= RIO_MOPEN;
if (p->RIOHalted)
goto bombout;
rio_dprintk(RIO_DEBUG_TTY, "high level open done\n");
/*
** Count opens for port statistics reporting
*/
if (PortP->statsGather)
PortP->opens++;
rio_spin_unlock_irqrestore(&PortP->portSem, flags);
rio_dprintk(RIO_DEBUG_TTY, "Returning from open\n");
func_exit();
return 0;
}
/*
** RIOClose the port.
** The operating system thinks that this is last close for the device.
** As there are two interfaces to the port (Modem and tty), we need to
** check that both are closed before we close the device.
*/
int riotclose(void *ptr)
{
struct Port *PortP = ptr; /* pointer to the port structure */
int deleted = 0;
int try = -1; /* Disable the timeouts by setting them to -1 */
int repeat_this = -1; /* Congrats to those having 15 years of
uptime! (You get to break the driver.) */
unsigned long end_time;
struct tty_struct *tty;
unsigned long flags;
int rv = 0;
rio_dprintk(RIO_DEBUG_TTY, "port close SysPort %d\n", PortP->PortNum);
/* PortP = p->RIOPortp[SysPort]; */
rio_dprintk(RIO_DEBUG_TTY, "Port is at address %p\n", PortP);
/* tp = PortP->TtyP; *//* Get tty */
tty = PortP->gs.tty;
rio_dprintk(RIO_DEBUG_TTY, "TTY is at address %p\n", tty);
if (PortP->gs.closing_wait)
end_time = jiffies + PortP->gs.closing_wait;
else
end_time = jiffies + MAX_SCHEDULE_TIMEOUT;
rio_spin_lock_irqsave(&PortP->portSem, flags);
/*
** Setting this flag will make any process trying to open
** this port block until we are complete closing it.
*/
PortP->State |= RIO_CLOSING;
if ((PortP->State & RIO_DELETED)) {
rio_dprintk(RIO_DEBUG_TTY, "Close on deleted RTA\n");
deleted = 1;
}
if (p->RIOHalted) {
RIOClearUp(PortP);
rv = -EIO;
goto close_end;
}
rio_dprintk(RIO_DEBUG_TTY, "Clear bits\n");
/*
** clear the open bits for this device
*/
PortP->State &= ~RIO_MOPEN;
PortP->State &= ~RIO_CARR_ON;
PortP->ModemState &= ~MSVR1_CD;
/*
** If the device was open as both a Modem and a tty line
** then we need to wimp out here, as the port has not really
** been finally closed (gee, whizz!) The test here uses the
** bit for the OTHER mode of operation, to see if THAT is
** still active!
*/
if ((PortP->State & (RIO_LOPEN | RIO_MOPEN))) {
/*
** The port is still open for the other task -
** return, pretending that we are still active.
*/
rio_dprintk(RIO_DEBUG_TTY, "Channel %d still open !\n", PortP->PortNum);
PortP->State &= ~RIO_CLOSING;
if (PortP->firstOpen)
PortP->firstOpen--;
rio_spin_unlock_irqrestore(&PortP->portSem, flags);
return -EIO;
}
rio_dprintk(RIO_DEBUG_TTY, "Closing down - everything must go!\n");
PortP->State &= ~RIO_DYNOROD;
/*
** This is where we wait for the port
** to drain down before closing. Bye-bye....
** (We never meant to do this)
*/
rio_dprintk(RIO_DEBUG_TTY, "Timeout 1 starts\n");
if (!deleted)
while ((PortP->InUse != NOT_INUSE) && !p->RIOHalted && (PortP->TxBufferIn != PortP->TxBufferOut)) {
if (repeat_this-- <= 0) {
rv = -EINTR;
rio_dprintk(RIO_DEBUG_TTY, "Waiting for not idle closed broken by signal\n");
RIOPreemptiveCmd(p, PortP, FCLOSE);
goto close_end;
}
rio_dprintk(RIO_DEBUG_TTY, "Calling timeout to flush in closing\n");
rio_spin_unlock_irqrestore(&PortP->portSem, flags);
if (RIODelay_ni(PortP, HUNDRED_MS * 10) == RIO_FAIL) {
rio_dprintk(RIO_DEBUG_TTY, "RTA EINTR in delay \n");
rv = -EINTR;
rio_spin_lock_irqsave(&PortP->portSem, flags);
goto close_end;
}
rio_spin_lock_irqsave(&PortP->portSem, flags);
}
PortP->TxBufferIn = PortP->TxBufferOut = 0;
repeat_this = 0xff;
PortP->InUse = 0;
if ((PortP->State & (RIO_LOPEN | RIO_MOPEN))) {
/*
** The port has been re-opened for the other task -
** return, pretending that we are still active.
*/
rio_dprintk(RIO_DEBUG_TTY, "Channel %d re-open!\n", PortP->PortNum);
PortP->State &= ~RIO_CLOSING;
rio_spin_unlock_irqrestore(&PortP->portSem, flags);
if (PortP->firstOpen)
PortP->firstOpen--;
return -EIO;
}
if (p->RIOHalted) {
RIOClearUp(PortP);
goto close_end;
}
/* Can't call RIOShortCommand with the port locked. */
rio_spin_unlock_irqrestore(&PortP->portSem, flags);
if (RIOShortCommand(p, PortP, CLOSE, 1, 0) == RIO_FAIL) {
RIOPreemptiveCmd(p, PortP, FCLOSE);
goto close_end;
}
if (!deleted)
while (try && (PortP->PortState & PORT_ISOPEN)) {
try--;
if (time_after(jiffies, end_time)) {
rio_dprintk(RIO_DEBUG_TTY, "Run out of tries - force the bugger shut!\n");
RIOPreemptiveCmd(p, PortP, FCLOSE);
break;
}
rio_dprintk(RIO_DEBUG_TTY, "Close: PortState:ISOPEN is %d\n", PortP->PortState & PORT_ISOPEN);
if (p->RIOHalted) {
RIOClearUp(PortP);
goto close_end;
}
if (RIODelay(PortP, HUNDRED_MS) == RIO_FAIL) {
rio_dprintk(RIO_DEBUG_TTY, "RTA EINTR in delay \n");
RIOPreemptiveCmd(p, PortP, FCLOSE);
break;
}
}
rio_spin_lock_irqsave(&PortP->portSem, flags);
rio_dprintk(RIO_DEBUG_TTY, "Close: try was %d on completion\n", try);
/* RIOPreemptiveCmd(p, PortP, FCLOSE); */
/*
** 15.10.1998 ARG - ESIL 0761 part fix
** RIO has it's own CTSFLOW and RTSFLOW flags in 'Config' in the port structure,** we need to make sure that the flags are clear when the port is opened.
*/
PortP->Config &= ~(RIO_CTSFLOW | RIO_RTSFLOW);
/*
** Count opens for port statistics reporting
*/
if (PortP->statsGather)
PortP->closes++;
close_end:
/* XXX: Why would a "DELETED" flag be reset here? I'd have
thought that a "deleted" flag means that the port was
permanently gone, but here we can make it reappear by it
being in close during the "deletion".
*/
PortP->State &= ~(RIO_CLOSING | RIO_DELETED);
if (PortP->firstOpen)
PortP->firstOpen--;
rio_spin_unlock_irqrestore(&PortP->portSem, flags);
rio_dprintk(RIO_DEBUG_TTY, "Return from close\n");
return rv;
}
static void RIOClearUp(struct Port *PortP)
{
rio_dprintk(RIO_DEBUG_TTY, "RIOHalted set\n");
PortP->Config = 0; /* Direct semaphore */
PortP->PortState = 0;
PortP->firstOpen = 0;
PortP->FlushCmdBodge = 0;
PortP->ModemState = PortP->CookMode = 0;
PortP->Mapped = 0;
PortP->WflushFlag = 0;
PortP->MagicFlags = 0;
PortP->RxDataStart = 0;
PortP->TxBufferIn = 0;
PortP->TxBufferOut = 0;
}
/*
** Put a command onto a port.
** The PortPointer, command, length and arg are passed.
** The len is the length *inclusive* of the command byte,
** and so for a command that takes no data, len==1.
** The arg is a single byte, and is only used if len==2.
** Other values of len aren't allowed, and will cause
** a panic.
*/
int RIOShortCommand(struct rio_info *p, struct Port *PortP, int command, int len, int arg)
{
struct PKT __iomem *PacketP;
int retries = 20; /* at 10 per second -> 2 seconds */
unsigned long flags;
rio_dprintk(RIO_DEBUG_TTY, "entering shortcommand.\n");
if (PortP->State & RIO_DELETED) {
rio_dprintk(RIO_DEBUG_TTY, "Short command to deleted RTA ignored\n");
return RIO_FAIL;
}
rio_spin_lock_irqsave(&PortP->portSem, flags);
/*
** If the port is in use for pre-emptive command, then wait for it to
** be free again.
*/
while ((PortP->InUse != NOT_INUSE) && !p->RIOHalted) {
rio_dprintk(RIO_DEBUG_TTY, "Waiting for not in use (%d)\n", retries);
rio_spin_unlock_irqrestore(&PortP->portSem, flags);
if (retries-- <= 0) {
return RIO_FAIL;
}
if (RIODelay_ni(PortP, HUNDRED_MS) == RIO_FAIL) {
return RIO_FAIL;
}
rio_spin_lock_irqsave(&PortP->portSem, flags);
}
if (PortP->State & RIO_DELETED) {
rio_dprintk(RIO_DEBUG_TTY, "Short command to deleted RTA ignored\n");
rio_spin_unlock_irqrestore(&PortP->portSem, flags);
return RIO_FAIL;
}
while (!can_add_transmit(&PacketP, PortP) && !p->RIOHalted) {
rio_dprintk(RIO_DEBUG_TTY, "Waiting to add short command to queue (%d)\n", retries);
rio_spin_unlock_irqrestore(&PortP->portSem, flags);
if (retries-- <= 0) {
rio_dprintk(RIO_DEBUG_TTY, "out of tries. Failing\n");
return RIO_FAIL;
}
if (RIODelay_ni(PortP, HUNDRED_MS) == RIO_FAIL) {
return RIO_FAIL;
}
rio_spin_lock_irqsave(&PortP->portSem, flags);
}
if (p->RIOHalted) {
rio_spin_unlock_irqrestore(&PortP->portSem, flags);
return RIO_FAIL;
}
/*
** set the command byte and the argument byte
*/
writeb(command, &PacketP->data[0]);
if (len == 2)
writeb(arg, &PacketP->data[1]);
/*
** set the length of the packet and set the command bit.
*/
writeb(PKT_CMD_BIT | len, &PacketP->len);
add_transmit(PortP);
/*
** Count characters transmitted for port statistics reporting
*/
if (PortP->statsGather)
PortP->txchars += len;
rio_spin_unlock_irqrestore(&PortP->portSem, flags);
return p->RIOHalted ? RIO_FAIL : ~RIO_FAIL;
}
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