670 lines
20 KiB
C
670 lines
20 KiB
C
/*
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** -----------------------------------------------------------------------------
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**
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** Perle Specialix driver for Linux
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** Ported from existing RIO Driver for SCO sources.
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*
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* (C) 1990 - 2000 Specialix International Ltd., Byfleet, Surrey, UK.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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**
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** Module : rioparam.c
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** SID : 1.3
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** Last Modified : 11/6/98 10:33:45
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** Retrieved : 11/6/98 10:33:50
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**
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** ident @(#)rioparam.c 1.3
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**
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** -----------------------------------------------------------------------------
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*/
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#ifdef SCCS_LABELS
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static char *_rioparam_c_sccs_ = "@(#)rioparam.c 1.3";
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#endif
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include <linux/tty.h>
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#include <asm/io.h>
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#include <asm/system.h>
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#include <asm/string.h>
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#include <asm/semaphore.h>
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#include <asm/uaccess.h>
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#include <linux/termios.h>
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#include <linux/serial.h>
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#include <linux/generic_serial.h>
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#include "linux_compat.h"
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#include "rio_linux.h"
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#include "pkt.h"
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#include "daemon.h"
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#include "rio.h"
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#include "riospace.h"
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#include "cmdpkt.h"
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#include "map.h"
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#include "rup.h"
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#include "port.h"
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#include "riodrvr.h"
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#include "rioinfo.h"
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#include "func.h"
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#include "errors.h"
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#include "pci.h"
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#include "parmmap.h"
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#include "unixrup.h"
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#include "board.h"
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#include "host.h"
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#include "phb.h"
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#include "link.h"
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#include "cmdblk.h"
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#include "route.h"
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#include "cirrus.h"
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#include "rioioctl.h"
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#include "param.h"
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/*
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** The Scam, based on email from jeremyr@bugs.specialix.co.uk....
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**
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** To send a command on a particular port, you put a packet with the
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** command bit set onto the port. The command bit is in the len field,
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** and gets ORed in with the actual byte count.
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**
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** When you send a packet with the command bit set, then the first
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** data byte ( data[0] ) is interpretted as the command to execute.
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** It also governs what data structure overlay should accompany the packet.
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** Commands are defined in cirrus/cirrus.h
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**
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** If you want the command to pre-emt data already on the queue for the
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** port, set the pre-emptive bit in conjunction with the command bit.
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** It is not defined what will happen if you set the preemptive bit
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** on a packet that is NOT a command.
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**
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** Pre-emptive commands should be queued at the head of the queue using
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** add_start(), whereas normal commands and data are enqueued using
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** add_end().
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**
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** Most commands do not use the remaining bytes in the data array. The
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** exceptions are OPEN MOPEN and CONFIG. (NB. As with the SI CONFIG and
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** OPEN are currently analagous). With these three commands the following
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** 11 data bytes are all used to pass config information such as baud rate etc.
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** The fields are also defined in cirrus.h. Some contain straightforward
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** information such as the transmit XON character. Two contain the transmit and
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** receive baud rates respectively. For most baud rates there is a direct
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** mapping between the rates defined in <sys/termio.h> and the byte in the
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** packet. There are additional (non UNIX-standard) rates defined in
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** /u/dos/rio/cirrus/h/brates.h.
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**
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** The rest of the data fields contain approximations to the Cirrus registers
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** that are used to program number of bits etc. Each registers bit fields is
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** defined in cirrus.h.
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**
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** NB. Only use those bits that are defined as being driver specific
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** or common to the RTA and the driver.
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**
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** All commands going from RTA->Host will be dealt with by the Host code - you
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** will never see them. As with the SI there will be three fields to look out
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** for in each phb (not yet defined - needs defining a.s.a.p).
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**
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** modem_status - current state of handshake pins.
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**
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** port_status - current port status - equivalent to hi_stat for SI, indicates
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** if port is IDLE_OPEN, IDLE_CLOSED etc.
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**
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** break_status - bit X set if break has been received.
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**
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** Happy hacking.
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**
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*/
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/*
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** RIOParam is used to open or configure a port. You pass it a PortP,
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** which will have a tty struct attached to it. You also pass a command,
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** either OPEN or CONFIG. The port's setup is taken from the t_ fields
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** of the tty struct inside the PortP, and the port is either opened
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** or re-configured. You must also tell RIOParam if the device is a modem
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** device or not (i.e. top bit of minor number set or clear - take special
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** care when deciding on this!).
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** RIOParam neither flushes nor waits for drain, and is NOT preemptive.
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**
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** RIOParam assumes it will be called at splrio(), and also assumes
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** that CookMode is set correctly in the port structure.
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**
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** NB. for MPX
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** tty lock must NOT have been previously acquired.
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*/
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int RIOParam(struct Port *PortP, int cmd, int Modem, int SleepFlag)
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{
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struct tty_struct *TtyP;
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int retval;
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struct phb_param __iomem *phb_param_ptr;
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struct PKT __iomem *PacketP;
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int res;
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u8 Cor1 = 0, Cor2 = 0, Cor4 = 0, Cor5 = 0;
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u8 TxXon = 0, TxXoff = 0, RxXon = 0, RxXoff = 0;
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u8 LNext = 0, TxBaud = 0, RxBaud = 0;
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int retries = 0xff;
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unsigned long flags;
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func_enter();
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TtyP = PortP->gs.tty;
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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);
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if (!TtyP) {
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rio_dprintk(RIO_DEBUG_PARAM, "Can't call rioparam with null tty.\n");
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func_exit();
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return RIO_FAIL;
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}
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rio_spin_lock_irqsave(&PortP->portSem, flags);
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if (cmd == OPEN) {
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/*
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** If the port is set to store or lock the parameters, and it is
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** paramed with OPEN, we want to restore the saved port termio, but
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** only if StoredTermio has been saved, i.e. NOT 1st open after reboot.
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*/
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}
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/*
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** wait for space
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*/
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while (!(res = can_add_transmit(&PacketP, PortP)) || (PortP->InUse != NOT_INUSE)) {
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if (retries-- <= 0) {
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break;
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}
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if (PortP->InUse != NOT_INUSE) {
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rio_dprintk(RIO_DEBUG_PARAM, "Port IN_USE for pre-emptive command\n");
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}
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if (!res) {
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rio_dprintk(RIO_DEBUG_PARAM, "Port has no space on transmit queue\n");
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}
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if (SleepFlag != OK_TO_SLEEP) {
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rio_spin_unlock_irqrestore(&PortP->portSem, flags);
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func_exit();
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return RIO_FAIL;
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}
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rio_dprintk(RIO_DEBUG_PARAM, "wait for can_add_transmit\n");
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rio_spin_unlock_irqrestore(&PortP->portSem, flags);
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retval = RIODelay(PortP, HUNDRED_MS);
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rio_spin_lock_irqsave(&PortP->portSem, flags);
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if (retval == RIO_FAIL) {
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rio_dprintk(RIO_DEBUG_PARAM, "wait for can_add_transmit broken by signal\n");
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rio_spin_unlock_irqrestore(&PortP->portSem, flags);
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func_exit();
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return -EINTR;
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}
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if (PortP->State & RIO_DELETED) {
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rio_spin_unlock_irqrestore(&PortP->portSem, flags);
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func_exit();
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return 0;
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}
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}
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if (!res) {
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rio_spin_unlock_irqrestore(&PortP->portSem, flags);
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func_exit();
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return RIO_FAIL;
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}
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rio_dprintk(RIO_DEBUG_PARAM, "can_add_transmit() returns %x\n", res);
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rio_dprintk(RIO_DEBUG_PARAM, "Packet is %p\n", PacketP);
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phb_param_ptr = (struct phb_param __iomem *) PacketP->data;
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switch (TtyP->termios->c_cflag & CSIZE) {
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case CS5:
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{
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rio_dprintk(RIO_DEBUG_PARAM, "5 bit data\n");
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Cor1 |= COR1_5BITS;
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break;
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}
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case CS6:
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{
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rio_dprintk(RIO_DEBUG_PARAM, "6 bit data\n");
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Cor1 |= COR1_6BITS;
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break;
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}
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case CS7:
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{
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rio_dprintk(RIO_DEBUG_PARAM, "7 bit data\n");
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Cor1 |= COR1_7BITS;
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break;
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}
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case CS8:
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{
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rio_dprintk(RIO_DEBUG_PARAM, "8 bit data\n");
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Cor1 |= COR1_8BITS;
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break;
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}
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}
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if (TtyP->termios->c_cflag & CSTOPB) {
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rio_dprintk(RIO_DEBUG_PARAM, "2 stop bits\n");
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Cor1 |= COR1_2STOP;
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} else {
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rio_dprintk(RIO_DEBUG_PARAM, "1 stop bit\n");
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Cor1 |= COR1_1STOP;
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}
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if (TtyP->termios->c_cflag & PARENB) {
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rio_dprintk(RIO_DEBUG_PARAM, "Enable parity\n");
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Cor1 |= COR1_NORMAL;
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} else {
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rio_dprintk(RIO_DEBUG_PARAM, "Disable parity\n");
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Cor1 |= COR1_NOP;
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}
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if (TtyP->termios->c_cflag & PARODD) {
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rio_dprintk(RIO_DEBUG_PARAM, "Odd parity\n");
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Cor1 |= COR1_ODD;
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} else {
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rio_dprintk(RIO_DEBUG_PARAM, "Even parity\n");
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Cor1 |= COR1_EVEN;
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}
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/*
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** COR 2
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*/
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if (TtyP->termios->c_iflag & IXON) {
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rio_dprintk(RIO_DEBUG_PARAM, "Enable start/stop output control\n");
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Cor2 |= COR2_IXON;
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} else {
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if (PortP->Config & RIO_IXON) {
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rio_dprintk(RIO_DEBUG_PARAM, "Force enable start/stop output control\n");
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Cor2 |= COR2_IXON;
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} else
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rio_dprintk(RIO_DEBUG_PARAM, "IXON has been disabled.\n");
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}
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if (TtyP->termios->c_iflag & IXANY) {
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if (PortP->Config & RIO_IXANY) {
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rio_dprintk(RIO_DEBUG_PARAM, "Enable any key to restart output\n");
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Cor2 |= COR2_IXANY;
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} else
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rio_dprintk(RIO_DEBUG_PARAM, "IXANY has been disabled due to sanity reasons.\n");
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}
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if (TtyP->termios->c_iflag & IXOFF) {
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rio_dprintk(RIO_DEBUG_PARAM, "Enable start/stop input control 2\n");
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Cor2 |= COR2_IXOFF;
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}
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if (TtyP->termios->c_cflag & HUPCL) {
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rio_dprintk(RIO_DEBUG_PARAM, "Hangup on last close\n");
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Cor2 |= COR2_HUPCL;
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}
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if (C_CRTSCTS(TtyP)) {
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rio_dprintk(RIO_DEBUG_PARAM, "Rx hardware flow control enabled\n");
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Cor2 |= COR2_CTSFLOW;
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Cor2 |= COR2_RTSFLOW;
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} else {
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rio_dprintk(RIO_DEBUG_PARAM, "Rx hardware flow control disabled\n");
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Cor2 &= ~COR2_CTSFLOW;
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Cor2 &= ~COR2_RTSFLOW;
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}
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if (TtyP->termios->c_cflag & CLOCAL) {
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rio_dprintk(RIO_DEBUG_PARAM, "Local line\n");
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} else {
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rio_dprintk(RIO_DEBUG_PARAM, "Possible Modem line\n");
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}
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/*
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** COR 4 (there is no COR 3)
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*/
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if (TtyP->termios->c_iflag & IGNBRK) {
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rio_dprintk(RIO_DEBUG_PARAM, "Ignore break condition\n");
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Cor4 |= COR4_IGNBRK;
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}
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if (!(TtyP->termios->c_iflag & BRKINT)) {
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rio_dprintk(RIO_DEBUG_PARAM, "Break generates NULL condition\n");
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Cor4 |= COR4_NBRKINT;
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} else {
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rio_dprintk(RIO_DEBUG_PARAM, "Interrupt on break condition\n");
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}
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if (TtyP->termios->c_iflag & INLCR) {
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rio_dprintk(RIO_DEBUG_PARAM, "Map newline to carriage return on input\n");
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Cor4 |= COR4_INLCR;
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}
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if (TtyP->termios->c_iflag & IGNCR) {
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rio_dprintk(RIO_DEBUG_PARAM, "Ignore carriage return on input\n");
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Cor4 |= COR4_IGNCR;
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}
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if (TtyP->termios->c_iflag & ICRNL) {
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rio_dprintk(RIO_DEBUG_PARAM, "Map carriage return to newline on input\n");
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Cor4 |= COR4_ICRNL;
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}
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if (TtyP->termios->c_iflag & IGNPAR) {
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rio_dprintk(RIO_DEBUG_PARAM, "Ignore characters with parity errors\n");
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Cor4 |= COR4_IGNPAR;
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}
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if (TtyP->termios->c_iflag & PARMRK) {
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rio_dprintk(RIO_DEBUG_PARAM, "Mark parity errors\n");
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Cor4 |= COR4_PARMRK;
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}
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/*
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** Set the RAISEMOD flag to ensure that the modem lines are raised
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** on reception of a config packet.
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** The download code handles the zero baud condition.
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*/
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Cor4 |= COR4_RAISEMOD;
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/*
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** COR 5
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*/
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Cor5 = COR5_CMOE;
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/*
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** Set to monitor tbusy/tstop (or not).
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*/
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if (PortP->MonitorTstate)
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Cor5 |= COR5_TSTATE_ON;
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else
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Cor5 |= COR5_TSTATE_OFF;
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/*
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** Could set LNE here if you wanted LNext processing. SVR4 will use it.
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*/
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if (TtyP->termios->c_iflag & ISTRIP) {
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rio_dprintk(RIO_DEBUG_PARAM, "Strip input characters\n");
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if (!(PortP->State & RIO_TRIAD_MODE)) {
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Cor5 |= COR5_ISTRIP;
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}
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}
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if (TtyP->termios->c_oflag & ONLCR) {
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rio_dprintk(RIO_DEBUG_PARAM, "Map newline to carriage-return, newline on output\n");
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if (PortP->CookMode == COOK_MEDIUM)
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Cor5 |= COR5_ONLCR;
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}
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if (TtyP->termios->c_oflag & OCRNL) {
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rio_dprintk(RIO_DEBUG_PARAM, "Map carriage return to newline on output\n");
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if (PortP->CookMode == COOK_MEDIUM)
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Cor5 |= COR5_OCRNL;
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}
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if ((TtyP->termios->c_oflag & TABDLY) == TAB3) {
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rio_dprintk(RIO_DEBUG_PARAM, "Tab delay 3 set\n");
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if (PortP->CookMode == COOK_MEDIUM)
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Cor5 |= COR5_TAB3;
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}
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/*
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** Flow control bytes.
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*/
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TxXon = TtyP->termios->c_cc[VSTART];
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TxXoff = TtyP->termios->c_cc[VSTOP];
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RxXon = TtyP->termios->c_cc[VSTART];
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RxXoff = TtyP->termios->c_cc[VSTOP];
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/*
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** LNEXT byte
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*/
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LNext = 0;
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/*
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** Baud rate bytes
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*/
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rio_dprintk(RIO_DEBUG_PARAM, "Mapping of rx/tx baud %x (%x)\n", TtyP->termios->c_cflag, CBAUD);
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switch (TtyP->termios->c_cflag & CBAUD) {
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#define e(b) case B ## b : RxBaud = TxBaud = RIO_B ## b ;break
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e(50);
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e(75);
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e(110);
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e(134);
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e(150);
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e(200);
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e(300);
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e(600);
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e(1200);
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e(1800);
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e(2400);
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e(4800);
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e(9600);
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e(19200);
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e(38400);
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e(57600);
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e(115200); /* e(230400);e(460800); e(921600); */
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}
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rio_dprintk(RIO_DEBUG_PARAM, "tx baud 0x%x, rx baud 0x%x\n", TxBaud, RxBaud);
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/*
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** Leftovers
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*/
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if (TtyP->termios->c_cflag & CREAD)
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rio_dprintk(RIO_DEBUG_PARAM, "Enable receiver\n");
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#ifdef RCV1EN
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if (TtyP->termios->c_cflag & RCV1EN)
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rio_dprintk(RIO_DEBUG_PARAM, "RCV1EN (?)\n");
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#endif
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#ifdef XMT1EN
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if (TtyP->termios->c_cflag & XMT1EN)
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rio_dprintk(RIO_DEBUG_PARAM, "XMT1EN (?)\n");
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#endif
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if (TtyP->termios->c_lflag & ISIG)
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rio_dprintk(RIO_DEBUG_PARAM, "Input character signal generating enabled\n");
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if (TtyP->termios->c_lflag & ICANON)
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rio_dprintk(RIO_DEBUG_PARAM, "Canonical input: erase and kill enabled\n");
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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");
|
|
/*
|
|
** 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
|
|
*/
|
|
writeb(cmd, &phb_param_ptr->Cmd);
|
|
writeb(Cor1, &phb_param_ptr->Cor1);
|
|
writeb(Cor2, &phb_param_ptr->Cor2);
|
|
writeb(Cor4, &phb_param_ptr->Cor4);
|
|
writeb(Cor5, &phb_param_ptr->Cor5);
|
|
writeb(TxXon, &phb_param_ptr->TxXon);
|
|
writeb(RxXon, &phb_param_ptr->RxXon);
|
|
writeb(TxXoff, &phb_param_ptr->TxXoff);
|
|
writeb(RxXoff, &phb_param_ptr->RxXoff);
|
|
writeb(LNext, &phb_param_ptr->LNext);
|
|
writeb(TxBaud, &phb_param_ptr->TxBaud);
|
|
writeb(RxBaud, &phb_param_ptr->RxBaud);
|
|
|
|
/*
|
|
** Set the length/command field
|
|
*/
|
|
writeb(12 | PKT_CMD_BIT, &PacketP->len);
|
|
|
|
/*
|
|
** 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 0;
|
|
}
|
|
|
|
|
|
/*
|
|
** 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(struct PKT __iomem **PktP, struct Port *PortP)
|
|
{
|
|
struct PKT __iomem *tp;
|
|
|
|
*PktP = tp = (struct PKT __iomem *) RIO_PTR(PortP->Caddr, readw(PortP->TxAdd));
|
|
|
|
return !((unsigned long) 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(struct Port *PortP)
|
|
{
|
|
if (readw(PortP->TxAdd) & PKT_IN_USE) {
|
|
rio_dprintk(RIO_DEBUG_PARAM, "add_transmit: Packet has been stolen!");
|
|
}
|
|
writew(readw(PortP->TxAdd) | PKT_IN_USE, PortP->TxAdd);
|
|
PortP->TxAdd = (PortP->TxAdd == PortP->TxEnd) ? PortP->TxStart : PortP->TxAdd + 1;
|
|
writew(RIO_OFF(PortP->Caddr, PortP->TxAdd), &PortP->PhbP->tx_add);
|
|
}
|
|
|
|
/****************************************
|
|
* Put a packet onto the end of the
|
|
* free list
|
|
****************************************/
|
|
void put_free_end(struct Host *HostP, struct PKT __iomem *PktP)
|
|
{
|
|
struct rio_free_list __iomem *tmp_pointer;
|
|
unsigned short 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=%p)\n", PktP);
|
|
|
|
if ((old_end = readw(&HostP->ParmMapP->free_list_end)) != TPNULL) {
|
|
new_end = RIO_OFF(HostP->Caddr, PktP);
|
|
tmp_pointer = (struct rio_free_list __iomem *) RIO_PTR(HostP->Caddr, old_end);
|
|
writew(new_end, &tmp_pointer->next);
|
|
writew(old_end, &((struct rio_free_list __iomem *) PktP)->prev);
|
|
writew(TPNULL, &((struct rio_free_list __iomem *) PktP)->next);
|
|
writew(new_end, &HostP->ParmMapP->free_list_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");
|
|
writew(RIO_OFF(HostP->Caddr, PktP), &HostP->ParmMapP->free_list_end);
|
|
tmp_pointer = (struct rio_free_list __iomem *) PktP;
|
|
writew(TPNULL, &tmp_pointer->prev);
|
|
writew(TPNULL, &tmp_pointer->next);
|
|
}
|
|
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(struct PKT __iomem **PktP, struct Port *PortP)
|
|
{
|
|
if (readw(PortP->RxRemove) & PKT_IN_USE) {
|
|
*PktP = (struct PKT __iomem *) RIO_PTR(PortP->Caddr, readw(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(struct Port *PortP)
|
|
{
|
|
writew(readw(PortP->RxRemove) & ~PKT_IN_USE, PortP->RxRemove);
|
|
PortP->RxRemove = (PortP->RxRemove == PortP->RxEnd) ? PortP->RxStart : PortP->RxRemove + 1;
|
|
writew(RIO_OFF(PortP->Caddr, PortP->RxRemove), &PortP->PhbP->rx_remove);
|
|
}
|