deviceio.c

uT Kernel os source code for AT91

	devcb = opncb->devcb;
	execfn = (EXCFN)devcb->ddev.execfn;
	exinf = devcb->ddev.exinf;
#if TA_GP
	gp = devcb->ddev.gp;
#endif

	/* Get request management block */
	reqcb = newReqCB(opncb);
	if ( reqcb == NULL ) {
		ercd = E_LIMIT;
		goto err_ret1;
	}

	/* Set request packet */
	reqcb->req.next   = NULL;
	reqcb->req.exinf  = NULL;
	reqcb->req.devid  = DEVID(devcb, opncb->unitno);
	reqcb->req.cmd    = cmd;
	reqcb->req.abort  = FALSE;
	reqcb->req.start  = start;
	reqcb->req.size   = size;
	reqcb->req.buf    = buf;
	reqcb->req.asize  = 0;
	reqcb->req.error  = 0;

	/* Indicate that it is during processing */
	reqcb->tskid = tk_get_tid_impl();

	UnlockDM();

	/* Device driver call */
	DISABLE_INTERRUPT;
	knl_ctxtsk->sysmode++;
	ENABLE_INTERRUPT;
#if TA_GP
	ercd = CallDeviceDriver(&reqcb->req, tmout, exinf, 0, (FP)execfn, gp);
#else
	ercd = (*execfn)(&reqcb->req, tmout, exinf);
#endif
	DISABLE_INTERRUPT;
	knl_ctxtsk->sysmode--;
	ENABLE_INTERRUPT;

	LockDM();

	/* Indicate that it is not during processing */
	reqcb->tskid = 0;

	/* If there is an abort completion wait task,
	   notify abort completion */
	if ( opncb->abort_tskid > 0 && --opncb->abort_cnt == 0 ) {
		tk_sig_sem_impl(opncb->abort_semid, 1);
	}

	if ( ercd < E_OK ) {
		goto err_ret2;
	}

	UnlockDM();

	return REQID(reqcb);

err_ret2:
	knl_delReqCB(reqcb);
err_ret1:
	UnlockDM();
	DEBUG_PRINT(("knl_request ercd = %d\n", ercd));
	return ercd;
}
#endif /* USE_FUNC_REQUEST */

#ifdef USE_FUNC_TK_REA_DEV
/*
 * Start reading from device
 */
SYSCALL ID tk_rea_dev_impl( ID dd, W start, VP buf, W size, TMO tmout )
{
	ER	ercd;

	ercd = knl_request(dd, start, buf, size, tmout, TDC_READ);

#ifdef DEBUG
	if ( ercd < E_OK ) {
		DEBUG_PRINT(("tk_rea_dev_impl ercd = %d\n", ercd));
	}
#endif
	return ercd;
}
#endif /* USE_FUNC_TK_REA_DEV */

#ifdef USE_FUNC_TK_SREA_DEV
/*
 * Synchronous reading from device
 */
SYSCALL ER tk_srea_dev_impl( ID dd, W start, VP buf, W size, W *asize )
{
	ER	ercd, ioercd;

	ercd = tk_rea_dev_impl(dd, start, buf, size, TMO_FEVR);
	if ( ercd < E_OK ) {
		goto err_ret;
	}

	ercd = tk_wai_dev_impl(dd, ercd, asize, &ioercd, TMO_FEVR);
	if ( ercd < E_OK ) {
		goto err_ret;
	}

	return ioercd;

err_ret:
	DEBUG_PRINT(("tk_srea_dev_impl ercd = %d\n", ercd));
	return ercd;
}
#endif /* USE_FUNC_TK_SREA_DEV */

#ifdef USE_FUNC_TK_WRI_DEV
/*
 * Start writing to device
 */
SYSCALL ID tk_wri_dev_impl( ID dd, W start, VP buf, W size, TMO tmout )
{
	ER	ercd;

	ercd = knl_request(dd, start, buf, size, tmout, TDC_WRITE);

#ifdef DEBUG
	if ( ercd < E_OK ) {
		DEBUG_PRINT(("tk_wri_dev_impl ercd = %d\n", ercd));
	}
#endif
	return ercd;
}
#endif /* USE_FUNC_TK_WRI_DEV */

#ifdef USE_FUNC_TK_SWRI_DEV
/*
 * Synchronous writing to device
 */
SYSCALL ER tk_swri_dev_impl( ID dd, W start, VP buf, W size, W *asize )
{
	ER	ercd, ioercd;

	ercd = tk_wri_dev_impl(dd, start, buf, size, TMO_FEVR);
	if ( ercd < E_OK ) {
		goto err_ret;
	}

	ercd = tk_wai_dev_impl(dd, ercd, asize, &ioercd, TMO_FEVR);
	if ( ercd < E_OK ) {
		goto err_ret;
	}

	return ioercd;

err_ret:
	DEBUG_PRINT(("tk_swri_dev_impl ercd = %d\n", ercd));
	return ercd;
}
#endif /* USE_FUNC_TK_SWRI_DEV */

#ifdef USE_FUNC_TK_WAI_DEV
/*
 * Verify validity of request ID
 */
LOCAL ReqCB* knl_check_reqid( ID reqid, OpnCB *opncb )
{
	ReqCB	*reqcb;

	if ( reqid < 1 || reqid > CFN_MAX_REQDEV ) {
		return NULL;
	}
	reqcb = REQCB(reqid);
	if ( reqcb->opncb != opncb ) {
		return NULL;
	}

	return reqcb;
}

/*
 * Request completion wait
 */
SYSCALL ID tk_wai_dev_impl( ID dd, ID reqid, W *asize, ER *ioer, TMO tmout )
{
	WAIFN	waitfn;
	VP	exinf;
#if TA_GP
	VP	gp;
#endif
	OpnCB	*opncb;
	DevCB	*devcb;
	ReqCB	*reqcb;
	T_DEVREQ *devreq;
	INT	reqno, nreq;
	ID	tskid;
	ER	ercd;

	tskid = tk_get_tid_impl();

	LockDM();

	ercd = knl_check_devdesc(dd, 0, &opncb);
	if ( ercd < E_OK ) {
		goto err_ret2;
	}

	devcb = opncb->devcb;
	waitfn = (WAIFN)devcb->ddev.waitfn;
	exinf = devcb->ddev.exinf;
#if TA_GP
	gp = devcb->ddev.gp;
#endif

	if ( reqid == 0 ) {
		/* When waiting for completion of any of requests for 'dd' */
		if ( opncb->nwaireq > 0 || opncb->waitone > 0 ) {
			ercd = E_OBJ;
			goto err_ret2;
		}
		if ( isQueEmpty(&opncb->requestq) ) {
			ercd = E_NOEXS;
			goto err_ret2;
		}

		/* Create wait request list */
		reqcb = (ReqCB*)opncb->requestq.next;
		for ( nreq = 1;; nreq++ ) {
			reqcb->tskid = tskid;
			devreq = &reqcb->req;
			reqcb = (ReqCB*)reqcb->q.next;
			if ( reqcb == (ReqCB*)&opncb->requestq ) {
				break;
			}
			devreq->next = &reqcb->req;
		}
		devreq->next = NULL;
		devreq = &((ReqCB*)opncb->requestq.next)->req;

		opncb->waireqlst = devreq;
		opncb->nwaireq = nreq;
	} else {
		/* Wait for completion of abort request processing */
		reqcb = knl_check_reqid(reqid, opncb);
		if ( reqcb == NULL ) {
			ercd = E_ID;
			goto err_ret2;
		}
		if ( opncb->nwaireq > 0 || reqcb->tskid > 0 ) {
			ercd = E_OBJ;
			goto err_ret2;
		}

		/* Create waiting request list */
		reqcb->tskid = tskid;
		devreq = &reqcb->req;
		devreq->next = NULL;
		nreq = 1;

		opncb->waitone++;
	}

	UnlockDM();

	/* Device driver call */
	DISABLE_INTERRUPT;
	knl_ctxtsk->sysmode++;
	ENABLE_INTERRUPT;
#if TA_GP
	reqno = CallDeviceDriver(devreq, nreq, tmout, exinf, (FP)waitfn, gp);
#else
	reqno = (*waitfn)(devreq, nreq, tmout, exinf);
#endif
	DISABLE_INTERRUPT;
	knl_ctxtsk->sysmode--;
	ENABLE_INTERRUPT;

	if ( reqno <  E_OK ) {
		ercd = reqno;
	}
	if ( reqno >= nreq ) {
		ercd = E_SYS;
	}

	LockDM();

	/* Free wait processing */
	if ( reqid == 0 ) {
		opncb->nwaireq = 0;
	} else {
		opncb->waitone--;
	}

	/* If there is an abort completion wait task,
	   notify abort completion */
	if ( opncb->abort_tskid > 0 && --opncb->abort_cnt == 0 ) {
		tk_sig_sem_impl(opncb->abort_semid, 1);
	}

	/* Get processing result */
	while ( devreq != NULL ) {
		reqcb = DEVREQ_REQCB(devreq);
		if ( reqno-- == 0 ) {
			reqid = REQID(reqcb);
			*asize = devreq->asize;
			*ioer  = devreq->error;
		}
		reqcb->tskid = 0;
		devreq = devreq->next;
	}

	if ( ercd < E_OK ) {
		goto err_ret2;
	}

	/* Unregister completed request */
	knl_delReqCB(REQCB(reqid));

	UnlockDM();

	return reqid;

err_ret2:
	UnlockDM();
	DEBUG_PRINT(("tk_wai_dev_impl ercd = %d\n", ercd));
	return ercd;
}
#endif /* USE_FUNC_TK_WAI_DEV */

/* ------------------------------------------------------------------------ */

#ifdef USE_FUNC_DISSUSCNT
/* Suspend disable request count */
EXPORT INT	knl_DisSusCnt = 0;
#endif /* USE_FUNC_DISSUSCNT */

#ifdef USE_FUNC_TK_SUS_DEV
/*
 * Send driver request event to each device
 */
LOCAL ER sendevt_alldevice( INT evttyp, BOOL disk )
{
	EVTFN	eventfn;
	QUEUE	*q;
	DevCB	*devcb;
	BOOL	d;
	ER	ercd = E_OK;

	for ( q = knl_UsedDevCB.next; q != &knl_UsedDevCB; q = q->next ) {
		devcb = (DevCB*)q;

		d = ( (devcb->ddev.devatr & TD_DEVTYPE) == TDK_DISK )?
							TRUE: FALSE;
		if ( disk != d ) {
			continue;
		}

		/* Device driver call */
		eventfn = (EVTFN)devcb->ddev.eventfn;
		DISABLE_INTERRUPT;
		knl_ctxtsk->sysmode++;
		ENABLE_INTERRUPT;
#if TA_GP
		ercd = CallDeviceDriver(evttyp, NULL, devcb->ddev.exinf, 0,
						(FP)eventfn, devcb->ddev.gp);
#else
		ercd = (*eventfn)(evttyp, NULL, devcb->ddev.exinf);
#endif
		DISABLE_INTERRUPT;
		knl_ctxtsk->sysmode--;
		ENABLE_INTERRUPT;
	}

#ifdef DEBUG
	if ( ercd < E_OK ) {
		DEBUG_PRINT(("sendevt_alldevice ercd = %d\n", ercd));
	}
#endif
	return ercd;
}

/*
 * Suspend
 */
LOCAL ER do_suspend( void )
{
	ER	ercd;

	/* Stop accepting device registration/unregistration */
	LockREG();

	/* Suspend processing of device except for disks */
	ercd = sendevt_alldevice(TDV_SUSPEND, FALSE);
#ifdef DEBUG
	if ( ercd < E_OK ) {
		DEBUG_PRINT(("2. do_suspend -> sendevt_alldevice ercd = %d\n", ercd));
	}
#endif

	/* Suspend processing of disk device */
	ercd = sendevt_alldevice(TDV_SUSPEND, TRUE);
#ifdef DEBUG
	if ( ercd < E_OK ) {
		DEBUG_PRINT(("3. do_suspend -> sendevt_alldevice ercd = %d\n", ercd));
	}
#endif

	/* Stop accepting new requests */
	LockDM();

	/*
	 * Insert code to transit to suspend state here
	 */

	/*
	 * Insert code executed on returning from suspend state
	 */


	/* Resume accepting requests */
	UnlockDM();

	/* Resume processing of disk device */
	ercd = sendevt_alldevice(TDV_RESUME, TRUE);
#ifdef DEBUG
	if ( ercd < E_OK ) {
		DEBUG_PRINT(("7. do_suspend -> sendevt_alldevice ercd = %d\n", ercd));
	}
#endif

	/* Resume processing of device except for disks */
	ercd = sendevt_alldevice(TDV_RESUME, FALSE);
#ifdef DEBUG
	if ( ercd < E_OK ) {
		DEBUG_PRINT(("8. do_suspend -> sendevt_alldevice ercd = %d\n", ercd));
	}
#endif

	/* Resume accepting device registration/unregistration */
	UnlockREG();

	return ercd;
}

/*
 * Suspend processing
 */
SYSCALL INT tk_sus_dev_impl( UINT mode )
{
	ResCB	*rescb;
	BOOL	suspend = FALSE;
	ER	ercd;

	/* Get resource management information */
	rescb = knl_GetResCB();
	if ( rescb == NULL ) {
		ercd = E_CTX;
		goto err_ret1;
	}

	LockDM();

	switch ( mode & 0xf ) {
	  case TD_SUSPEND:	/* Suspend */
		if ( knl_DisSusCnt > 0 && (mode & TD_FORCE) == 0 ) {
			ercd = E_BUSY;
			goto err_ret2;
		}
		suspend = TRUE;
		break;

	  case TD_DISSUS:	/* Disable suspend */
		if ( knl_DisSusCnt >= MAX_DISSUS ) {
			ercd = E_QOVR;
			goto err_ret2;
		}
		knl_DisSusCnt++;
		rescb->dissus++;
		break;
	  case TD_ENASUS:	/* Enable suspend */
		if ( rescb->dissus > 0 ) {
			rescb->dissus--;
			knl_DisSusCnt--;
		}
		break;

	  case TD_CHECK:	/* Get suspend disable request count */
		break;

	  default:
		ercd = E_PAR;
		goto err_ret2;
	}

	UnlockDM();

	if ( suspend ) {
		/* Suspend */
		ercd = do_suspend();
		if ( ercd < E_OK ) {
			goto err_ret1;
		}
	}

	return knl_DisSusCnt;

err_ret2:
	UnlockDM();
err_ret1:
	DEBUG_PRINT(("tk_sus_dev_impl ercd = %d\n", ercd));
	return ercd;
}
#endif /* USE_FUNC_TK_SUS_DEV */

/* ------------------------------------------------------------------------ */

#ifdef USE_FUNC_DEVMGR_STARTUP
/*
 * Device management startup function
 */
EXPORT void knl_devmgr_startup( void )
{
	LockDM();

	/* Initialization of open device management queue */
	QueInit(&(knl_resource_control_block.openq));

	UnlockDM();

	return;
}
#endif /* USE_FUNC_DEVMGR_STARTUP */

#ifdef USE_FUNC_DEVMGR_CLEANUP
/*
 * Device management cleanup function
 */
EXPORT void knl_devmgr_cleanup( void )
{
	OpnCB	*opncb;

	/* Do nothing if it is not used even once */
	if ( knl_resource_control_block.openq.next == NULL ) {
		return;
	}

	LockDM();

	/* Free suspend disable request */
	knl_DisSusCnt -= knl_resource_control_block.dissus;
	knl_resource_control_block.dissus = 0;

	/* Close all open devices */
	while ( !isQueEmpty(&(knl_resource_control_block.openq)) ) {
		opncb = RESQ_OPNCB(knl_resource_control_block.openq.next);

		/* Indicate that it is during close processing */
		opncb->resid = 0;

		UnlockDM();

		/* Device close processing */
		knl_close_device(opncb, 0);

		LockDM();
	}
	UnlockDM();

	return;
}
#endif /* USE_FUNC_DEVMGR_CLEANUP */

#ifdef USE_FUNC_INITDEVIO
/*
 * Initialization sequence of device input/output-related
 */
EXPORT ER knl_initDevIO( void )
{
	INT	i;

	QueInit(&knl_FreeOpnCB);
	for ( i = 0; i < CFN_MAX_OPNDEV; ++i ) {
		knl_OpnCBtbl[i].resid = 0;
		QueInsert(&knl_OpnCBtbl[i].q, &knl_FreeOpnCB);
	}

	QueInit(&knl_FreeReqCB);
	for ( i = 0; i < CFN_MAX_REQDEV; ++i ) {
		knl_ReqCBtbl[i].opncb = NULL;
		QueInsert(&knl_ReqCBtbl[i].q, &knl_FreeReqCB);
	}

	return E_OK;
}
#endif /* USE_FUNC_INITDEVIO */

#ifdef USE_FUNC_FINISHDEVIO
/*
 * Finalization sequence of device input/output-related
 */
EXPORT ER knl_finishDevIO( void )
{
	return E_OK;
}
#endif /* USE_FUNC_FINISHDEVIO */

#endif /* CFN_MAX_REGDEV */