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5. message.c

/* $Id: message.c,v 1.5.8.2 2001/09/23 22:24:59 kai Exp $
 *
 * functions for sending and receiving control messages
 *
 * Copyright (C) 1996  SpellCaster Telecommunications Inc.
 *
 * This software may be used and distributed according to the terms
 * of the GNU General Public License, incorporated herein by reference.
 *
 * For more information, please contact gpl-info@spellcast.com or write:
 *
 *     SpellCaster Telecommunications Inc.
 *     5621 Finch Avenue East, Unit #3
 *     Scarborough, Ontario  Canada
 *     M1B 2T9
 *     +1 (416) 297-8565
 *     +1 (416) 297-6433 Facsimile
 */
#include <linux/sched.h>
#include "includes.h"
#include "hardware.h"
#include "message.h"
#include "card.h"

/*
 * receive a message from the board
 */
int receivemessage(int card, RspMessage *rspmsg)
{
	DualPortMemory *dpm;
	unsigned long flags;

	if (!IS_VALID_CARD(card)) {
		pr_debug("Invalid param: %d is not a valid card id\n", card);
		return -EINVAL;
	}

	pr_debug("%s: Entered receivemessage\n",
		 sc_adapter[card]->devicename);

	/*
	 * See if there are messages waiting
	 */
	if (inb(sc_adapter[card]->ioport[FIFO_STATUS]) & RF_HAS_DATA) {
		/*
		 * Map in the DPM to the base page and copy the message
		 */
		spin_lock_irqsave(&sc_adapter[card]->lock, flags);
		outb((sc_adapter[card]->shmem_magic >> 14) | 0x80,
		     sc_adapter[card]->ioport[sc_adapter[card]->shmem_pgport]);
		dpm = (DualPortMemory *) sc_adapter[card]->rambase;
		memcpy_fromio(rspmsg, &(dpm->rsp_queue[dpm->rsp_tail]),
			      MSG_LEN);
		dpm->rsp_tail = (dpm->rsp_tail + 1) % MAX_MESSAGES;
		inb(sc_adapter[card]->ioport[FIFO_READ]);
		spin_unlock_irqrestore(&sc_adapter[card]->lock, flags);
		/*
		 * Tell the board that the message is received
		 */
		pr_debug("%s: Received Message seq:%d pid:%d time:%d cmd:%d "
			 "cnt:%d (type,class,code):(%d,%d,%d) "
			 "link:%d stat:0x%x\n",
			 sc_adapter[card]->devicename,
			 rspmsg->sequence_no,
			 rspmsg->process_id,
			 rspmsg->time_stamp,
			 rspmsg->cmd_sequence_no,
			 rspmsg->msg_byte_cnt,
			 rspmsg->type,
			 rspmsg->class,
			 rspmsg->code,
			 rspmsg->phy_link_no,
			 rspmsg->rsp_status);

		return 0;
	}
	return -ENOMSG;
}

/*
 * send a message to the board
 */
int sendmessage(int card,
		unsigned int procid,
		unsigned int type,
		unsigned int class,
		unsigned int code,
		unsigned int link,
		unsigned int data_len,
		unsigned int *data)
{
	DualPortMemory *dpm;
	ReqMessage sndmsg;
	unsigned long flags;

	if (!IS_VALID_CARD(card)) {
		pr_debug("Invalid param: %d is not a valid card id\n", card);
		return -EINVAL;
	}

	/*
	 * Make sure we only send CEPID messages when the engine is up
	 * and CMPID messages when it is down
	 */
	if (sc_adapter[card]->EngineUp && procid == CMPID) {
		pr_debug("%s: Attempt to send CM message with engine up\n",
			 sc_adapter[card]->devicename);
		return -ESRCH;
	}

	if (!sc_adapter[card]->EngineUp && procid == CEPID) {
		pr_debug("%s: Attempt to send CE message with engine down\n",
			 sc_adapter[card]->devicename);
		return -ESRCH;
	}

	memset(&sndmsg, 0, MSG_LEN);
	sndmsg.msg_byte_cnt = 4;
	sndmsg.type = type;
	sndmsg.class = class;
	sndmsg.code = code;
	sndmsg.phy_link_no = link;

	if (data_len > 0) {
		if (data_len > MSG_DATA_LEN)
			data_len = MSG_DATA_LEN;
		memcpy(&(sndmsg.msg_data), data, data_len);
		sndmsg.msg_byte_cnt = data_len + 8;
	}

	sndmsg.process_id = procid;
	sndmsg.sequence_no = sc_adapter[card]->seq_no++ % 256;

	/*
	 * wait for an empty slot in the queue
	 */
	while (!(inb(sc_adapter[card]->ioport[FIFO_STATUS]) & WF_NOT_FULL))
		udelay(1);

	/*
	 * Disable interrupts and map in shared memory
	 */
	spin_lock_irqsave(&sc_adapter[card]->lock, flags);
	outb((sc_adapter[card]->shmem_magic >> 14) | 0x80,
	     sc_adapter[card]->ioport[sc_adapter[card]->shmem_pgport]);
	dpm = (DualPortMemory *) sc_adapter[card]->rambase;	/* Fix me */
	memcpy_toio(&(dpm->req_queue[dpm->req_head]), &sndmsg, MSG_LEN);
	dpm->req_head = (dpm->req_head + 1) % MAX_MESSAGES;
	outb(sndmsg.sequence_no, sc_adapter[card]->ioport[FIFO_WRITE]);
	spin_unlock_irqrestore(&sc_adapter[card]->lock, flags);

	pr_debug("%s: Sent Message seq:%d pid:%d time:%d "
		 "cnt:%d (type,class,code):(%d,%d,%d) "
		 "link:%d\n ",
		 sc_adapter[card]->devicename,
		 sndmsg.sequence_no,
		 sndmsg.process_id,
		 sndmsg.time_stamp,
		 sndmsg.msg_byte_cnt,
		 sndmsg.type,
		 sndmsg.class,
		 sndmsg.code,
		 sndmsg.phy_link_no);

	return 0;
}

int send_and_receive(int card,
		     unsigned int procid,
		     unsigned char type,
		     unsigned char class,
		     unsigned char code,
		     unsigned char link,
		     unsigned char data_len,
		     unsigned char *data,
		     RspMessage *mesgdata,
		     int timeout)
{
	int retval;
	int tries;

	if (!IS_VALID_CARD(card)) {
		pr_debug("Invalid param: %d is not a valid card id\n", card);
		return -EINVAL;
	}

	sc_adapter[card]->want_async_messages = 1;
	retval = sendmessage(card, procid, type, class, code, link,
			     data_len, (unsigned int *) data);

	if (retval) {
		pr_debug("%s: SendMessage failed in SAR\n",
			 sc_adapter[card]->devicename);
		sc_adapter[card]->want_async_messages = 0;
		return -EIO;
	}

	tries = 0;
	/* wait for the response */
	while (tries < timeout) {
		schedule_timeout_interruptible(1);

		pr_debug("SAR waiting..\n");

		/*
		 * See if we got our message back
		 */
		if ((sc_adapter[card]->async_msg.type == type) &&
		    (sc_adapter[card]->async_msg.class == class) &&
		    (sc_adapter[card]->async_msg.code == code) &&
		    (sc_adapter[card]->async_msg.phy_link_no == link)) {

			/*
			 * Got it!
			 */
			pr_debug("%s: Got ASYNC message\n",
				 sc_adapter[card]->devicename);
			memcpy(mesgdata, &(sc_adapter[card]->async_msg),
			       sizeof(RspMessage));
			sc_adapter[card]->want_async_messages = 0;
			return 0;
		}

		tries++;
	}

	pr_debug("%s: SAR message timeout\n", sc_adapter[card]->devicename);
	sc_adapter[card]->want_async_messages = 0;
	return -ETIME;
}