/* ** ----------------------------------------------------------------------------- ** ** 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; }