rioparam.c

来自「linux2.6.16版本」· C语言 代码 · 共 695 行 · 第 1/2 页

/*
** -----------------------------------------------------------------------------
**
**  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 [e-mail]....
**
** 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.
		 */
	}

	/*
	 ** 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;


	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) {