diff options
Diffstat (limited to 'drivers/char/rio/rioparam.c')
| -rw-r--r-- | drivers/char/rio/rioparam.c | 744 |
1 files changed, 744 insertions, 0 deletions
diff --git a/drivers/char/rio/rioparam.c b/drivers/char/rio/rioparam.c new file mode 100644 index 000000000000..f10916326ecc --- /dev/null +++ b/drivers/char/rio/rioparam.c @@ -0,0 +1,744 @@ +/* +** ----------------------------------------------------------------------------- +** +** 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 : rioparam.c +** SID : 1.3 +** Last Modified : 11/6/98 10:33:45 +** Retrieved : 11/6/98 10:33:50 +** +** ident @(#)rioparam.c 1.3 +** +** ----------------------------------------------------------------------------- +*/ + +#ifdef SCCS_LABELS +static char *_rioparam_c_sccs_ = "@(#)rioparam.c 1.3"; +#endif + +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/errno.h> +#include <linux/tty.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 "typdef.h" +#include "pkt.h" +#include "daemon.h" +#include "rio.h" +#include "riospace.h" +#include "top.h" +#include "cmdpkt.h" +#include "map.h" +#include "riotypes.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 "error.h" +#include "phb.h" +#include "link.h" +#include "cmdblk.h" +#include "route.h" +#include "control.h" +#include "cirrus.h" +#include "rioioctl.h" +#include "param.h" +#include "list.h" +#include "sam.h" + + + +/* +** The Scam, based on email from jeremyr@bugs.specialix.co.uk.... +** +** To send a command on a particular port, you put a packet with the +** command bit set onto the port. The command bit is in the len field, +** and gets ORed in with the actual byte count. +** +** When you send a packet with the command bit set, then the first +** data byte ( data[0] ) is interpretted as the command to execute. +** It also governs what data structure overlay should accompany the packet. +** Commands are defined in cirrus/cirrus.h +** +** If you want the command to pre-emt data already on the queue for the +** port, set the pre-emptive bit in conjunction with the command bit. +** It is not defined what will happen if you set the preemptive bit +** on a packet that is NOT a command. +** +** Pre-emptive commands should be queued at the head of the queue using +** add_start(), whereas normal commands and data are enqueued using +** add_end(). +** +** Most commands do not use the remaining bytes in the data array. The +** exceptions are OPEN MOPEN and CONFIG. (NB. As with the SI CONFIG and +** OPEN are currently analagous). With these three commands the following +** 11 data bytes are all used to pass config information such as baud rate etc. +** The fields are also defined in cirrus.h. Some contain straightforward +** information such as the transmit XON character. Two contain the transmit and +** receive baud rates respectively. For most baud rates there is a direct +** mapping between the rates defined in <sys/termio.h> and the byte in the +** packet. There are additional (non UNIX-standard) rates defined in +** /u/dos/rio/cirrus/h/brates.h. +** +** The rest of the data fields contain approximations to the Cirrus registers +** that are used to program number of bits etc. Each registers bit fields is +** defined in cirrus.h. +** +** NB. Only use those bits that are defined as being driver specific +** or common to the RTA and the driver. +** +** All commands going from RTA->Host will be dealt with by the Host code - you +** will never see them. As with the SI there will be three fields to look out +** for in each phb (not yet defined - needs defining a.s.a.p). +** +** modem_status - current state of handshake pins. +** +** port_status - current port status - equivalent to hi_stat for SI, indicates +** if port is IDLE_OPEN, IDLE_CLOSED etc. +** +** break_status - bit X set if break has been received. +** +** Happy hacking. +** +*/ + +/* +** RIOParam is used to open or configure a port. You pass it a PortP, +** which will have a tty struct attached to it. You also pass a command, +** either OPEN or CONFIG. The port's setup is taken from the t_ fields +** of the tty struct inside the PortP, and the port is either opened +** or re-configured. You must also tell RIOParam if the device is a modem +** device or not (i.e. top bit of minor number set or clear - take special +** care when deciding on this!). +** RIOParam neither flushes nor waits for drain, and is NOT preemptive. +** +** RIOParam assumes it will be called at splrio(), and also assumes +** that CookMode is set correctly in the port structure. +** +** NB. for MPX +** tty lock must NOT have been previously acquired. +*/ +int +RIOParam(PortP, cmd, Modem, SleepFlag) +struct Port *PortP; +int cmd; +int Modem; +int SleepFlag; +{ + register struct tty_struct *TtyP; + int retval; + register struct phb_param *phb_param_ptr; + PKT *PacketP; + int res; + uchar Cor1=0, Cor2=0, Cor4=0, Cor5=0; + uchar TxXon=0, TxXoff=0, RxXon=0, RxXoff=0; + uchar LNext=0, TxBaud=0, RxBaud=0; + int retries = 0xff; + unsigned long flags; + + func_enter (); + + TtyP = PortP->gs.tty; + + rio_dprintk (RIO_DEBUG_PARAM, "RIOParam: Port:%d cmd:%d Modem:%d SleepFlag:%d Mapped: %d, tty=%p\n", + PortP->PortNum, cmd, Modem, SleepFlag, PortP->Mapped, TtyP); + + if (!TtyP) { + rio_dprintk (RIO_DEBUG_PARAM, "Can't call rioparam with null tty.\n"); + + func_exit (); + + return RIO_FAIL; + } + rio_spin_lock_irqsave(&PortP->portSem, flags ); + + if (cmd == OPEN) { + /* + ** If the port is set to store or lock the parameters, and it is + ** paramed with OPEN, we want to restore the saved port termio, but + ** only if StoredTermio has been saved, i.e. NOT 1st open after reboot. + */ +#if 0 + if (PortP->FirstOpen) { + PortP->StoredTty.iflag = TtyP->tm.c_iflag; + PortP->StoredTty.oflag = TtyP->tm.c_oflag; + PortP->StoredTty.cflag = TtyP->tm.c_cflag; + PortP->StoredTty.lflag = TtyP->tm.c_lflag; + PortP->StoredTty.line = TtyP->tm.c_line; + for (i = 0; i < NCC + 5; i++) + PortP->StoredTty.cc[i] = TtyP->tm.c_cc[i]; + PortP->FirstOpen = 0; + } + else if (PortP->Store || PortP->Lock) { + rio_dprintk (RIO_DEBUG_PARAM, "OPEN: Restoring stored/locked params\n"); + TtyP->tm.c_iflag = PortP->StoredTty.iflag; + TtyP->tm.c_oflag = PortP->StoredTty.oflag; + TtyP->tm.c_cflag = PortP->StoredTty.cflag; + TtyP->tm.c_lflag = PortP->StoredTty.lflag; + TtyP->tm.c_line = PortP->StoredTty.line; + for (i = 0; i < NCC + 5; i++) + TtyP->tm.c_cc[i] = PortP->StoredTty.cc[i]; + } +#endif + } + + /* + ** wait for space + */ + while ( !(res=can_add_transmit(&PacketP,PortP)) || + (PortP->InUse != NOT_INUSE) ) { + if (retries -- <= 0) { + break; + } + if ( PortP->InUse != NOT_INUSE ) { + rio_dprintk (RIO_DEBUG_PARAM, "Port IN_USE for pre-emptive command\n"); + } + + if ( !res ) { + rio_dprintk (RIO_DEBUG_PARAM, "Port has no space on transmit queue\n"); + } + + if ( SleepFlag != OK_TO_SLEEP ) { + rio_spin_unlock_irqrestore( &PortP->portSem, flags); + func_exit(); + + return RIO_FAIL; + } + + rio_dprintk (RIO_DEBUG_PARAM, "wait for can_add_transmit\n"); + rio_spin_unlock_irqrestore( &PortP->portSem, flags); + retval = RIODelay(PortP, HUNDRED_MS); + rio_spin_lock_irqsave( &PortP->portSem, flags); + if (retval == RIO_FAIL) { + rio_dprintk (RIO_DEBUG_PARAM, "wait for can_add_transmit broken by signal\n"); + rio_spin_unlock_irqrestore( &PortP->portSem, flags); + pseterr(EINTR); + func_exit(); + + return RIO_FAIL; + } + if ( PortP->State & RIO_DELETED ) { + rio_spin_unlock_irqrestore( &PortP->portSem, flags); + func_exit (); + + return RIO_SUCCESS; + } + } + + if (!res) { + rio_spin_unlock_irqrestore( &PortP->portSem, flags); + func_exit (); + + return RIO_FAIL; + } + + rio_dprintk (RIO_DEBUG_PARAM, "can_add_transmit() returns %x\n",res); + rio_dprintk (RIO_DEBUG_PARAM, "Packet is 0x%x\n",(int) PacketP); + + phb_param_ptr = (struct phb_param *)PacketP->data; + + +#if 0 + /* + ** COR 1 + */ + if ( TtyP->tm.c_iflag & INPCK ) { + rio_dprintk (RIO_DEBUG_PARAM, "Parity checking on input enabled\n"); + Cor1 |= COR1_INPCK; + } +#endif + + switch ( TtyP->termios->c_cflag & CSIZE ) { + case CS5: + { + rio_dprintk (RIO_DEBUG_PARAM, "5 bit data\n"); + Cor1 |= COR1_5BITS; + break; + } + case CS6: + { + rio_dprintk (RIO_DEBUG_PARAM, "6 bit data\n"); + Cor1 |= COR1_6BITS; + break; + } + case CS7: + { + rio_dprintk (RIO_DEBUG_PARAM, "7 bit data\n"); + Cor1 |= COR1_7BITS; + break; + } + case CS8: + { + rio_dprintk (RIO_DEBUG_PARAM, "8 bit data\n"); + Cor1 |= COR1_8BITS; + break; + } + } + + if ( TtyP->termios->c_cflag & CSTOPB ) { + rio_dprintk (RIO_DEBUG_PARAM, "2 stop bits\n"); + Cor1 |= COR1_2STOP; + } + else { + rio_dprintk (RIO_DEBUG_PARAM, "1 stop bit\n"); + Cor1 |= COR1_1STOP; + } + + if ( TtyP->termios->c_cflag & PARENB ) { + rio_dprintk (RIO_DEBUG_PARAM, "Enable parity\n"); + Cor1 |= COR1_NORMAL; + } + else { + rio_dprintk (RIO_DEBUG_PARAM, "Disable parity\n"); + Cor1 |= COR1_NOP; + } + if ( TtyP->termios->c_cflag & PARODD ) { + rio_dprintk (RIO_DEBUG_PARAM, "Odd parity\n"); + Cor1 |= COR1_ODD; + } + else { + rio_dprintk (RIO_DEBUG_PARAM, "Even parity\n"); + Cor1 |= COR1_EVEN; + } + + /* + ** COR 2 + */ + if ( TtyP->termios->c_iflag & IXON ) { + rio_dprintk (RIO_DEBUG_PARAM, "Enable start/stop output control\n"); + Cor2 |= COR2_IXON; + } + else { + if ( PortP->Config & RIO_IXON ) { + rio_dprintk (RIO_DEBUG_PARAM, "Force enable start/stop output control\n"); + Cor2 |= COR2_IXON; + } + else + rio_dprintk (RIO_DEBUG_PARAM, "IXON has been disabled.\n"); + } + + if (TtyP->termios->c_iflag & IXANY) { + if ( PortP->Config & RIO_IXANY ) { + rio_dprintk (RIO_DEBUG_PARAM, "Enable any key to restart output\n"); + Cor2 |= COR2_IXANY; + } + else + rio_dprintk (RIO_DEBUG_PARAM, "IXANY has been disabled due to sanity reasons.\n"); + } + + if ( TtyP->termios->c_iflag & IXOFF ) { + rio_dprintk (RIO_DEBUG_PARAM, "Enable start/stop input control 2\n"); + Cor2 |= COR2_IXOFF; + } + + if ( TtyP->termios->c_cflag & HUPCL ) { + rio_dprintk (RIO_DEBUG_PARAM, "Hangup on last close\n"); + Cor2 |= COR2_HUPCL; + } + + if ( C_CRTSCTS (TtyP)) { + rio_dprintk (RIO_DEBUG_PARAM, "Rx hardware flow control enabled\n"); + Cor2 |= COR2_CTSFLOW; + Cor2 |= COR2_RTSFLOW; + } else { + rio_dprintk (RIO_DEBUG_PARAM, "Rx hardware flow control disabled\n"); + Cor2 &= ~COR2_CTSFLOW; + Cor2 &= ~COR2_RTSFLOW; + } + + + if ( TtyP->termios->c_cflag & CLOCAL ) { + rio_dprintk (RIO_DEBUG_PARAM, "Local line\n"); + } + else { + rio_dprintk (RIO_DEBUG_PARAM, "Possible Modem line\n"); + } + + /* + ** COR 4 (there is no COR 3) + */ + if ( TtyP->termios->c_iflag & IGNBRK ) { + rio_dprintk (RIO_DEBUG_PARAM, "Ignore break condition\n"); + Cor4 |= COR4_IGNBRK; + } + if ( !(TtyP->termios->c_iflag & BRKINT) ) { + rio_dprintk (RIO_DEBUG_PARAM, "Break generates NULL condition\n"); + Cor4 |= COR4_NBRKINT; + } else { + rio_dprintk (RIO_DEBUG_PARAM, "Interrupt on break condition\n"); + } + + if ( TtyP->termios->c_iflag & INLCR ) { + rio_dprintk (RIO_DEBUG_PARAM, "Map newline to carriage return on input\n"); + Cor4 |= COR4_INLCR; + } + + if ( TtyP->termios->c_iflag & IGNCR ) { + rio_dprintk (RIO_DEBUG_PARAM, "Ignore carriage return on input\n"); + Cor4 |= COR4_IGNCR; + } + + if ( TtyP->termios->c_iflag & ICRNL ) { + rio_dprintk (RIO_DEBUG_PARAM, "Map carriage return to newline on input\n"); + Cor4 |= COR4_ICRNL; + } + if ( TtyP->termios->c_iflag & IGNPAR ) { + rio_dprintk (RIO_DEBUG_PARAM, "Ignore characters with parity errors\n"); + Cor4 |= COR4_IGNPAR; + } + if ( TtyP->termios->c_iflag & PARMRK ) { + rio_dprintk (RIO_DEBUG_PARAM, "Mark parity errors\n"); + Cor4 |= COR4_PARMRK; + } + + /* + ** Set the RAISEMOD flag to ensure that the modem lines are raised + ** on reception of a config packet. + ** The download code handles the zero baud condition. + */ + Cor4 |= COR4_RAISEMOD; + + /* + ** COR 5 + */ + + Cor5 = COR5_CMOE; + + /* + ** Set to monitor tbusy/tstop (or not). + */ + + if (PortP->MonitorTstate) + Cor5 |= COR5_TSTATE_ON; + else + Cor5 |= COR5_TSTATE_OFF; + + /* + ** Could set LNE here if you wanted LNext processing. SVR4 will use it. + */ + if ( TtyP->termios->c_iflag & ISTRIP ) { + rio_dprintk (RIO_DEBUG_PARAM, "Strip input characters\n"); + if (! (PortP->State & RIO_TRIAD_MODE)) { + Cor5 |= COR5_ISTRIP; + } + } + + if ( TtyP->termios->c_oflag & ONLCR ) { + rio_dprintk (RIO_DEBUG_PARAM, "Map newline to carriage-return, newline on output\n"); + if ( PortP->CookMode == COOK_MEDIUM ) + Cor5 |= COR5_ONLCR; + } + if ( TtyP->termios->c_oflag & OCRNL ) { + rio_dprintk (RIO_DEBUG_PARAM, "Map carriage return to newline on output\n"); + if ( PortP->CookMode == COOK_MEDIUM ) + Cor5 |= COR5_OCRNL; + } + if ( ( TtyP->termios->c_oflag & TABDLY) == TAB3 ) { + rio_dprintk (RIO_DEBUG_PARAM, "Tab delay 3 set\n"); + if ( PortP->CookMode == COOK_MEDIUM ) + Cor5 |= COR5_TAB3; + } + + /* + ** Flow control bytes. + */ + TxXon = TtyP->termios->c_cc[VSTART]; + TxXoff = TtyP->termios->c_cc[VSTOP]; + RxXon = TtyP->termios->c_cc[VSTART]; + RxXoff = TtyP->termios->c_cc[VSTOP]; + /* + ** LNEXT byte + */ + LNext = 0; + + /* + ** Baud rate bytes + */ + rio_dprintk (RIO_DEBUG_PARAM, "Mapping of rx/tx baud %x (%x)\n", + TtyP->termios->c_cflag, CBAUD); + + switch (TtyP->termios->c_cflag & CBAUD) { +#define e(b) case B ## b : RxBaud = TxBaud = RIO_B ## b ;break + e(50);e(75);e(110);e(134);e(150);e(200);e(300);e(600);e(1200); + e(1800);e(2400);e(4800);e(9600);e(19200);e(38400);e(57600); + e(115200); /* e(230400);e(460800); e(921600); */ + } + + /* XXX MIssing conversion table. XXX */ + /* (TtyP->termios->c_cflag & V_CBAUD); */ + + rio_dprintk (RIO_DEBUG_PARAM, "tx baud 0x%x, rx baud 0x%x\n", TxBaud, RxBaud); + + + /* + ** Leftovers + */ + if ( TtyP->termios->c_cflag & CREAD ) + rio_dprintk (RIO_DEBUG_PARAM, "Enable receiver\n"); +#ifdef RCV1EN + if ( TtyP->termios->c_cflag & RCV1EN ) + rio_dprintk (RIO_DEBUG_PARAM, "RCV1EN (?)\n"); +#endif +#ifdef XMT1EN + if ( TtyP->termios->c_cflag & XMT1EN ) + rio_dprintk (RIO_DEBUG_PARAM, "XMT1EN (?)\n"); +#endif +#if 0 + if ( TtyP->termios->c_cflag & LOBLK ) + rio_dprintk (RIO_DEBUG_PARAM, "LOBLK - JCL output blocks when not current\n"); +#endif + if ( TtyP->termios->c_lflag & ISIG ) + rio_dprintk (RIO_DEBUG_PARAM, "Input character signal generating enabled\n"); + if ( TtyP->termios->c_lflag & ICANON ) + rio_dprintk (RIO_DEBUG_PARAM, "Canonical input: erase and kill enabled\n"); + if ( TtyP->termios->c_lflag & XCASE ) + rio_dprintk (RIO_DEBUG_PARAM, "Canonical upper/lower presentation\n"); + if ( TtyP->termios->c_lflag & ECHO ) + rio_dprintk (RIO_DEBUG_PARAM, "Enable input echo\n"); + if ( TtyP->termios->c_lflag & ECHOE ) + rio_dprintk (RIO_DEBUG_PARAM, "Enable echo erase\n"); + if ( TtyP->termios->c_lflag & ECHOK ) + rio_dprintk (RIO_DEBUG_PARAM, "Enable echo kill\n"); + if ( TtyP->termios->c_lflag & ECHONL ) + rio_dprintk (RIO_DEBUG_PARAM, "Enable echo newline\n"); + if ( TtyP->termios->c_lflag & NOFLSH ) + rio_dprintk (RIO_DEBUG_PARAM, "Disable flush after interrupt or quit\n"); +#ifdef TOSTOP + if ( TtyP->termios->c_lflag & TOSTOP ) + rio_dprintk (RIO_DEBUG_PARAM, "Send SIGTTOU for background output\n"); +#endif +#ifdef XCLUDE + if ( TtyP->termios->c_lflag & XCLUDE ) + rio_dprintk (RIO_DEBUG_PARAM, "Exclusive use of this line\n"); +#endif + if ( TtyP->termios->c_iflag & IUCLC ) + rio_dprintk (RIO_DEBUG_PARAM, "Map uppercase to lowercase on input\n"); + if ( TtyP->termios->c_oflag & OPOST ) + rio_dprintk (RIO_DEBUG_PARAM, "Enable output post-processing\n"); + if ( TtyP->termios->c_oflag & OLCUC ) + rio_dprintk (RIO_DEBUG_PARAM, "Map lowercase to uppercase on output\n"); + if ( TtyP->termios->c_oflag & ONOCR ) + rio_dprintk (RIO_DEBUG_PARAM, "No carriage return output at column 0\n"); + if ( TtyP->termios->c_oflag & ONLRET ) + rio_dprintk (RIO_DEBUG_PARAM, "Newline performs carriage return function\n"); + if ( TtyP->termios->c_oflag & OFILL ) + rio_dprintk (RIO_DEBUG_PARAM, "Use fill characters for delay\n"); + if ( TtyP->termios->c_oflag & OFDEL ) + rio_dprintk (RIO_DEBUG_PARAM, "Fill character is DEL\n"); + if ( TtyP->termios->c_oflag & NLDLY ) + rio_dprintk (RIO_DEBUG_PARAM, "Newline delay set\n"); + if ( TtyP->termios->c_oflag & CRDLY ) + rio_dprintk (RIO_DEBUG_PARAM, "Carriage return delay set\n"); + if ( TtyP->termios->c_oflag & TABDLY ) + rio_dprintk (RIO_DEBUG_PARAM, "Tab delay set\n"); +#if 0 + if ( TtyP->termios->c_oflag & BSDLY ) + rio_dprintk (RIO_DEBUG_PARAM, "Back-space delay set\n"); + if ( TtyP->termios->c_oflag & VTDLY ) + rio_dprintk (RIO_DEBUG_PARAM, "Vertical tab delay set\n"); + if ( TtyP->termios->c_oflag & FFDLY ) + rio_dprintk (RIO_DEBUG_PARAM, "Form-feed delay set\n"); +#endif + /* + ** These things are kind of useful in a later life! + */ + PortP->Cor2Copy = Cor2; + + if ( PortP->State & RIO_DELETED ) { + rio_spin_unlock_irqrestore( &PortP->portSem, flags); + func_exit (); + + return RIO_FAIL; + } + + /* + ** Actually write the info into the packet to be sent + */ + WBYTE(phb_param_ptr->Cmd, cmd); + WBYTE(phb_param_ptr->Cor1, Cor1); + WBYTE(phb_param_ptr->Cor2, Cor2); + WBYTE(phb_param_ptr->Cor4, Cor4); + WBYTE(phb_param_ptr->Cor5, Cor5); + WBYTE(phb_param_ptr->TxXon, TxXon); + WBYTE(phb_param_ptr->RxXon, RxXon); + WBYTE(phb_param_ptr->TxXoff, TxXoff); + WBYTE(phb_param_ptr->RxXoff, RxXoff); + WBYTE(phb_param_ptr->LNext, LNext); + WBYTE(phb_param_ptr->TxBaud, TxBaud); + WBYTE(phb_param_ptr->RxBaud, RxBaud); + + /* + ** Set the length/command field + */ + WBYTE(PacketP->len , 12 | PKT_CMD_BIT); + + /* + ** The packet is formed - now, whack it off + ** to its final destination: + */ + add_transmit(PortP); + /* + ** Count characters transmitted for port statistics reporting + */ + if (PortP->statsGather) + PortP->txchars += 12; + + rio_spin_unlock_irqrestore( &PortP->portSem, flags); + + rio_dprintk (RIO_DEBUG_PARAM, "add_transmit returned.\n"); + /* + ** job done. + */ + func_exit (); + + return RIO_SUCCESS; +} + + +/* +** We can add another packet to a transmit queue if the packet pointer pointed +** to by the TxAdd pointer has PKT_IN_USE clear in its address. +*/ +int +can_add_transmit(PktP, PortP) +PKT **PktP; +struct Port *PortP; +{ + register PKT *tp; + + *PktP = tp = (PKT *)RIO_PTR(PortP->Caddr,RWORD(*PortP->TxAdd)); + + return !((uint)tp & PKT_IN_USE); +} + +/* +** To add a packet to the queue, you set the PKT_IN_USE bit in the address, +** and then move the TxAdd pointer along one position to point to the next +** packet pointer. You must wrap the pointer from the end back to the start. +*/ +void +add_transmit(PortP) +struct Port *PortP; +{ + if (RWORD(*PortP->TxAdd) & PKT_IN_USE) { + rio_dprintk (RIO_DEBUG_PARAM, "add_transmit: Packet has been stolen!"); + } + WWORD( *(ushort *)PortP->TxAdd, RWORD(*PortP->TxAdd) | PKT_IN_USE); + PortP->TxAdd = (PortP->TxAdd == PortP->TxEnd) ? PortP->TxStart : + PortP->TxAdd + 1; + WWORD( PortP->PhbP->tx_add , RIO_OFF(PortP->Caddr,PortP->TxAdd) ); +} + +/**************************************** + * Put a packet onto the end of the + * free list + ****************************************/ +void +put_free_end(HostP, PktP) +struct Host *HostP; +PKT *PktP; +{ + FREE_LIST *tmp_pointer; + ushort old_end, new_end; + unsigned long flags; + + rio_spin_lock_irqsave(&HostP->HostLock, flags); + + /************************************************* + * Put a packet back onto the back of the free list + * + ************************************************/ + + rio_dprintk (RIO_DEBUG_PFE, "put_free_end(PktP=%x)\n",(int)PktP); + + if ((old_end=RWORD(HostP->ParmMapP->free_list_end)) != TPNULL) { + new_end = RIO_OFF(HostP->Caddr,PktP); + tmp_pointer = (FREE_LIST *)RIO_PTR(HostP->Caddr,old_end); + WWORD(tmp_pointer->next , new_end ); + WWORD(((FREE_LIST *)PktP)->prev , old_end); + WWORD(((FREE_LIST *)PktP)->next , TPNULL); + WWORD(HostP->ParmMapP->free_list_end, new_end); + } + else { /* First packet on the free list this should never happen! */ + rio_dprintk (RIO_DEBUG_PFE, "put_free_end(): This should never happen\n"); + WWORD(HostP->ParmMapP->free_list_end , RIO_OFF(HostP->Caddr,PktP)); + tmp_pointer = (FREE_LIST *)PktP; + WWORD(tmp_pointer->prev , TPNULL); + WWORD(tmp_pointer->next , TPNULL); + } + rio_dprintk (RIO_DEBUG_CMD, "Before unlock: %p\n", &HostP->HostLock); + rio_spin_unlock_irqrestore(&HostP->HostLock, flags); +} + +/* +** can_remove_receive(PktP,P) returns non-zero if PKT_IN_USE is set +** for the next packet on the queue. It will also set PktP to point to the +** relevant packet, [having cleared the PKT_IN_USE bit]. If PKT_IN_USE is clear, +** then can_remove_receive() returns 0. +*/ +int +can_remove_receive(PktP, PortP) +PKT **PktP; +struct Port *PortP; +{ + if ( RWORD(*PortP->RxRemove) & PKT_IN_USE) { + *PktP = (PKT *)RIO_PTR(PortP->Caddr, + RWORD(*PortP->RxRemove) & ~PKT_IN_USE); + return 1; + } + return 0; +} + +/* +** To remove a packet from the receive queue you clear its PKT_IN_USE bit, +** and then bump the pointers. Once the pointers get to the end, they must +** be wrapped back to the start. +*/ +void +remove_receive(PortP) +struct Port *PortP; +{ + WWORD( *PortP->RxRemove, RWORD(*PortP->RxRemove) & ~PKT_IN_USE ); + PortP->RxRemove = (PortP->RxRemove == PortP->RxEnd) ? PortP->RxStart : + PortP->RxRemove + 1; + WWORD( PortP->PhbP->rx_remove , RIO_OFF(PortP->Caddr, PortP->RxRemove) ); +} |