riocmd.c

来自「LINUX 2.6.17.4的源码」· C语言 代码 · 共 944 行 · 第 1/2 页

			PortP->ModemState = ReportedModemStatus;
		} else {
			rio_dprintk(RIO_DEBUG_CMD, "Modem status change from 0x%x to 0x%x\n", PortP->ModemState, ReportedModemStatus);
			PortP->ModemState = ReportedModemStatus;
#ifdef MODEM_SUPPORT
			if (PortP->Mapped) {
				/***********************************************************\
				*************************************************************
				***													   ***
				***		  M O D E M   S T A T E   C H A N G E		  ***
				***													   ***
				*************************************************************
				\***********************************************************/
				/*
				 ** If the device is a modem, then check the modem
				 ** carrier.
				 */
				if (PortP->gs.tty == NULL)
					break;
				if (PortP->gs.tty->termios == NULL)
					break;

				if (!(PortP->gs.tty->termios->c_cflag & CLOCAL) && ((PortP->State & (RIO_MOPEN | RIO_WOPEN)))) {

					rio_dprintk(RIO_DEBUG_CMD, "Is there a Carrier?\n");
					/*
					 ** Is there a carrier?
					 */
					if (PortP->ModemState & MSVR1_CD) {
						/*
						 ** Has carrier just appeared?
						 */
						if (!(PortP->State & RIO_CARR_ON)) {
							rio_dprintk(RIO_DEBUG_CMD, "Carrier just came up.\n");
							PortP->State |= RIO_CARR_ON;
							/*
							 ** wakeup anyone in WOPEN
							 */
							if (PortP->State & (PORT_ISOPEN | RIO_WOPEN))
								wake_up_interruptible(&PortP->gs.open_wait);
						}
					} else {
						/*
						 ** Has carrier just dropped?
						 */
						if (PortP->State & RIO_CARR_ON) {
							if (PortP->State & (PORT_ISOPEN | RIO_WOPEN | RIO_MOPEN))
								tty_hangup(PortP->gs.tty);
							PortP->State &= ~RIO_CARR_ON;
							rio_dprintk(RIO_DEBUG_CMD, "Carrirer just went down\n");
						}
					}
				}
			}
#endif
		}
		break;

	default:
		rio_dprintk(RIO_DEBUG_CMD, "Unknown command %d on CMD_RUP of host %Zd\n", readb(&PktCmdP->Command), HostP - p->RIOHosts);
		break;
	}
	rio_spin_unlock_irqrestore(&PortP->portSem, flags);

	func_exit();

	return 1;
}

/*
** The command mechanism:
**	Each rup has a chain of commands associated with it.
**	This chain is maintained by routines in this file.
**	Periodically we are called and we run a quick check of all the
**	active chains to determine if there is a command to be executed,
**	and if the rup is ready to accept it.
**
*/

/*
** Allocate an empty command block.
*/
struct CmdBlk *RIOGetCmdBlk(void)
{
	struct CmdBlk *CmdBlkP;

	CmdBlkP = (struct CmdBlk *)kmalloc(sizeof(struct CmdBlk), GFP_ATOMIC);
	if (CmdBlkP)
		memset(CmdBlkP, 0, sizeof(struct CmdBlk));
	return CmdBlkP;
}

/*
** Return a block to the head of the free list.
*/
void RIOFreeCmdBlk(struct CmdBlk *CmdBlkP)
{
	kfree(CmdBlkP);
}

/*
** attach a command block to the list of commands to be performed for
** a given rup.
*/
int RIOQueueCmdBlk(struct Host *HostP, uint Rup, struct CmdBlk *CmdBlkP)
{
	struct CmdBlk **Base;
	struct UnixRup *UnixRupP;
	unsigned long flags;

	if (Rup >= (unsigned short) (MAX_RUP + LINKS_PER_UNIT)) {
		rio_dprintk(RIO_DEBUG_CMD, "Illegal rup number %d in RIOQueueCmdBlk\n", Rup);
		RIOFreeCmdBlk(CmdBlkP);
		return RIO_FAIL;
	}

	UnixRupP = &HostP->UnixRups[Rup];

	rio_spin_lock_irqsave(&UnixRupP->RupLock, flags);

	/*
	 ** If the RUP is currently inactive, then put the request
	 ** straight on the RUP....
	 */
	if ((UnixRupP->CmdsWaitingP == NULL) && (UnixRupP->CmdPendingP == NULL) && (readw(&UnixRupP->RupP->txcontrol) == TX_RUP_INACTIVE) && (CmdBlkP->PreFuncP ? (*CmdBlkP->PreFuncP) (CmdBlkP->PreArg, CmdBlkP)
																	     : 1)) {
		rio_dprintk(RIO_DEBUG_CMD, "RUP inactive-placing command straight on. Cmd byte is 0x%x\n", CmdBlkP->Packet.data[0]);

		/*
		 ** Whammy! blat that pack!
		 */
		HostP->Copy((caddr_t) & CmdBlkP->Packet, RIO_PTR(HostP->Caddr, UnixRupP->RupP->txpkt), sizeof(struct PKT));

		/*
		 ** place command packet on the pending position.
		 */
		UnixRupP->CmdPendingP = CmdBlkP;

		/*
		 ** set the command register
		 */
		writew(TX_PACKET_READY, &UnixRupP->RupP->txcontrol);

		rio_spin_unlock_irqrestore(&UnixRupP->RupLock, flags);

		return 0;
	}
	rio_dprintk(RIO_DEBUG_CMD, "RUP active - en-queing\n");

	if (UnixRupP->CmdsWaitingP != NULL)
		rio_dprintk(RIO_DEBUG_CMD, "Rup active - command waiting\n");
	if (UnixRupP->CmdPendingP != NULL)
		rio_dprintk(RIO_DEBUG_CMD, "Rup active - command pending\n");
	if (readw(&UnixRupP->RupP->txcontrol) != TX_RUP_INACTIVE)
		rio_dprintk(RIO_DEBUG_CMD, "Rup active - command rup not ready\n");

	Base = &UnixRupP->CmdsWaitingP;

	rio_dprintk(RIO_DEBUG_CMD, "First try to queue cmdblk %p at %p\n", CmdBlkP, Base);

	while (*Base) {
		rio_dprintk(RIO_DEBUG_CMD, "Command cmdblk %p here\n", *Base);
		Base = &((*Base)->NextP);
		rio_dprintk(RIO_DEBUG_CMD, "Now try to queue cmd cmdblk %p at %p\n", CmdBlkP, Base);
	}

	rio_dprintk(RIO_DEBUG_CMD, "Will queue cmdblk %p at %p\n", CmdBlkP, Base);

	*Base = CmdBlkP;

	CmdBlkP->NextP = NULL;

	rio_spin_unlock_irqrestore(&UnixRupP->RupLock, flags);

	return 0;
}

/*
** Here we go - if there is an empty rup, fill it!
** must be called at splrio() or higher.
*/
void RIOPollHostCommands(struct rio_info *p, struct Host *HostP)
{
	struct CmdBlk *CmdBlkP;
	struct UnixRup *UnixRupP;
	struct PKT *PacketP;
	unsigned short Rup;
	unsigned long flags;


	Rup = MAX_RUP + LINKS_PER_UNIT;

	do {			/* do this loop for each RUP */
		/*
		 ** locate the rup we are processing & lock it
		 */
		UnixRupP = &HostP->UnixRups[--Rup];

		spin_lock_irqsave(&UnixRupP->RupLock, flags);

		/*
		 ** First check for incoming commands:
		 */
		if (readw(&UnixRupP->RupP->rxcontrol) != RX_RUP_INACTIVE) {
			int FreeMe;

			PacketP = (struct PKT *) RIO_PTR(HostP->Caddr, readw(&UnixRupP->RupP->rxpkt));

			switch (readb(&PacketP->dest_port)) {
			case BOOT_RUP:
				rio_dprintk(RIO_DEBUG_CMD, "Incoming Boot %s packet '%x'\n", readb(&PacketP->len) & 0x80 ? "Command" : "Data", readb(&PacketP->data[0]));
				rio_spin_unlock_irqrestore(&UnixRupP->RupLock, flags);
				FreeMe = RIOBootRup(p, Rup, HostP, PacketP);
				rio_spin_lock_irqsave(&UnixRupP->RupLock, flags);
				break;

			case COMMAND_RUP:
				/*
				 ** Free the RUP lock as loss of carrier causes a
				 ** ttyflush which will (eventually) call another
				 ** routine that uses the RUP lock.
				 */
				rio_spin_unlock_irqrestore(&UnixRupP->RupLock, flags);
				FreeMe = RIOCommandRup(p, Rup, HostP, PacketP);
				if (PacketP->data[5] == MEMDUMP) {
					rio_dprintk(RIO_DEBUG_CMD, "Memdump from 0x%x complete\n", *(unsigned short *) & (PacketP->data[6]));
					HostP->Copy((caddr_t) & (PacketP->data[8]), (caddr_t) p->RIOMemDump, 32);
				}
				rio_spin_lock_irqsave(&UnixRupP->RupLock, flags);
				break;

			case ROUTE_RUP:
				rio_spin_unlock_irqrestore(&UnixRupP->RupLock, flags);
				FreeMe = RIORouteRup(p, Rup, HostP, PacketP);
				rio_spin_lock_irqsave(&UnixRupP->RupLock, flags);
				break;

			default:
				rio_dprintk(RIO_DEBUG_CMD, "Unknown RUP %d\n", readb(&PacketP->dest_port));
				FreeMe = 1;
				break;
			}

			if (FreeMe) {
				rio_dprintk(RIO_DEBUG_CMD, "Free processed incoming command packet\n");
				put_free_end(HostP, PacketP);

				writew(RX_RUP_INACTIVE, &UnixRupP->RupP->rxcontrol);

				if (readw(&UnixRupP->RupP->handshake) == PHB_HANDSHAKE_SET) {
					rio_dprintk(RIO_DEBUG_CMD, "Handshake rup %d\n", Rup);
					writew(PHB_HANDSHAKE_SET | PHB_HANDSHAKE_RESET, &UnixRupP->RupP->handshake);
				}
			}
		}

		/*
		 ** IF a command was running on the port,
		 ** and it has completed, then tidy it up.
		 */
		if ((CmdBlkP = UnixRupP->CmdPendingP) &&	/* ASSIGN! */
		    (readw(&UnixRupP->RupP->txcontrol) == TX_RUP_INACTIVE)) {
			/*
			 ** we are idle.
			 ** there is a command in pending.
			 ** Therefore, this command has finished.
			 ** So, wakeup whoever is waiting for it (and tell them
			 ** what happened).
			 */
			if (CmdBlkP->Packet.dest_port == BOOT_RUP)
				rio_dprintk(RIO_DEBUG_CMD, "Free Boot %s Command Block '%x'\n", CmdBlkP->Packet.len & 0x80 ? "Command" : "Data", CmdBlkP->Packet.data[0]);

			rio_dprintk(RIO_DEBUG_CMD, "Command %p completed\n", CmdBlkP);

			/*
			 ** Clear the Rup lock to prevent mutual exclusion.
			 */
			if (CmdBlkP->PostFuncP) {
				rio_spin_unlock_irqrestore(&UnixRupP->RupLock, flags);
				(*CmdBlkP->PostFuncP) (CmdBlkP->PostArg, CmdBlkP);
				rio_spin_lock_irqsave(&UnixRupP->RupLock, flags);
			}

			/*
			 ** ....clear the pending flag....
			 */
			UnixRupP->CmdPendingP = NULL;

			/*
			 ** ....and return the command block to the freelist.
			 */
			RIOFreeCmdBlk(CmdBlkP);
		}

		/*
		 ** If there is a command for this rup, and the rup
		 ** is idle, then process the command
		 */
		if ((CmdBlkP = UnixRupP->CmdsWaitingP) &&	/* ASSIGN! */
		    (UnixRupP->CmdPendingP == NULL) && (readw(&UnixRupP->RupP->txcontrol) == TX_RUP_INACTIVE)) {
			/*
			 ** if the pre-function is non-zero, call it.
			 ** If it returns RIO_FAIL then don't
			 ** send this command yet!
			 */
			if (!(CmdBlkP->PreFuncP ? (*CmdBlkP->PreFuncP) (CmdBlkP->PreArg, CmdBlkP) : 1)) {
				rio_dprintk(RIO_DEBUG_CMD, "Not ready to start command %p\n", CmdBlkP);
			} else {
				rio_dprintk(RIO_DEBUG_CMD, "Start new command %p Cmd byte is 0x%x\n", CmdBlkP, CmdBlkP->Packet.data[0]);
				/*
				 ** Whammy! blat that pack!
				 */
				HostP->Copy((caddr_t) & CmdBlkP->Packet, RIO_PTR(HostP->Caddr, UnixRupP->RupP->txpkt), sizeof(struct PKT));

				/*
				 ** remove the command from the rup command queue...
				 */
				UnixRupP->CmdsWaitingP = CmdBlkP->NextP;

				/*
				 ** ...and place it on the pending position.
				 */
				UnixRupP->CmdPendingP = CmdBlkP;

				/*
				 ** set the command register
				 */
				writew(TX_PACKET_READY, &UnixRupP->RupP->txcontrol);

				/*
				 ** the command block will be freed
				 ** when the command has been processed.
				 */
			}
		}
		spin_unlock_irqrestore(&UnixRupP->RupLock, flags);
	} while (Rup);
}

int RIOWFlushMark(unsigned long iPortP, struct CmdBlk *CmdBlkP)
{
	struct Port *PortP = (struct Port *) iPortP;
	unsigned long flags;

	rio_spin_lock_irqsave(&PortP->portSem, flags);
	PortP->WflushFlag++;
	PortP->MagicFlags |= MAGIC_FLUSH;
	rio_spin_unlock_irqrestore(&PortP->portSem, flags);
	return RIOUnUse(iPortP, CmdBlkP);
}

int RIORFlushEnable(unsigned long iPortP, struct CmdBlk *CmdBlkP)
{
	struct Port *PortP = (struct Port *) iPortP;
	struct PKT *PacketP;
	unsigned long flags;

	rio_spin_lock_irqsave(&PortP->portSem, flags);

	while (can_remove_receive(&PacketP, PortP)) {
		remove_receive(PortP);
		put_free_end(PortP->HostP, PacketP);
	}

	if (readw(&PortP->PhbP->handshake) == PHB_HANDSHAKE_SET) {
		/*
		 ** MAGIC! (Basically, handshake the RX buffer, so that
		 ** the RTAs upstream can be re-enabled.)
		 */
		rio_dprintk(RIO_DEBUG_CMD, "Util: Set RX handshake bit\n");
		writew(PHB_HANDSHAKE_SET | PHB_HANDSHAKE_RESET, &PortP->PhbP->handshake);
	}
	rio_spin_unlock_irqrestore(&PortP->portSem, flags);
	return RIOUnUse(iPortP, CmdBlkP);
}

int RIOUnUse(unsigned long iPortP, struct CmdBlk *CmdBlkP)
{
	struct Port *PortP = (struct Port *) iPortP;
	unsigned long flags;

	rio_spin_lock_irqsave(&PortP->portSem, flags);

	rio_dprintk(RIO_DEBUG_CMD, "Decrement in use count for port\n");

	if (PortP->InUse) {
		if (--PortP->InUse != NOT_INUSE) {
			rio_spin_unlock_irqrestore(&PortP->portSem, flags);
			return 0;
		}
	}
	/*
	 ** While PortP->InUse is set (i.e. a preemptive command has been sent to
	 ** the RTA and is awaiting completion), any transmit data is prevented from
	 ** being transferred from the write queue into the transmit packets
	 ** (add_transmit) and no furthur transmit interrupt will be sent for that
	 ** data. The next interrupt will occur up to 500ms later (RIOIntr is called
	 ** twice a second as a saftey measure). This was the case when kermit was
	 ** used to send data into a RIO port. After each packet was sent, TCFLSH
	 ** was called to flush the read queue preemptively. PortP->InUse was
	 ** incremented, thereby blocking the 6 byte acknowledgement packet
	 ** transmitted back. This acknowledgment hung around for 500ms before
	 ** being sent, thus reducing input performance substantially!.
	 ** When PortP->InUse becomes NOT_INUSE, we must ensure that any data
	 ** hanging around in the transmit buffer is sent immediately.
	 */
	writew(1, &PortP->HostP->ParmMapP->tx_intr);
	/* What to do here ..
	   wakeup( (caddr_t)&(PortP->InUse) );
	 */
	rio_spin_unlock_irqrestore(&PortP->portSem, flags);
	return 0;
}

/*
** 
** How to use this file:
** 
** To send a command down a rup, you need to allocate a command block, fill
** in the packet information, fill in the command number, fill in the pre-
** and post- functions and arguments, and then add the command block to the
** queue of command blocks for the port in question. When the port is idle,
** then the pre-function will be called. If this returns RIO_FAIL then the
** command will be re-queued and tried again at a later date (probably in one
** clock tick). If the pre-function returns NOT RIO_FAIL, then the command
** packet will be queued on the RUP, and the txcontrol field set to the
** command number. When the txcontrol field has changed from being the
** command number, then the post-function will be called, with the argument
** specified earlier, a pointer to the command block, and the value of
** txcontrol.
** 
** To allocate a command block, call RIOGetCmdBlk(). This returns a pointer
** to the command block structure allocated, or NULL if there aren't any.
** The block will have been zeroed for you.
** 
** The structure has the following fields:
** 
** struct CmdBlk
** {
**	 struct CmdBlk *NextP;		  ** Pointer to next command block   **
**	 struct PKT	 Packet;		** A packet, to copy to the rup	**
**			int	 (*PreFuncP)();  ** The func to call to check if OK **
**			int	 PreArg;		** The arg for the func			**
**			int	 (*PostFuncP)(); ** The func to call when completed **
**			int	 PostArg;	   ** The arg for the func			**
** };
** 
** You need to fill in ALL fields EXCEPT NextP, which is used to link the
** blocks together either on the free list or on the Rup list.
** 
** Packet is an actual packet structure to be filled in with the packet
** information associated with the command. You need to fill in everything,
** as the command processore doesn't process the command packet in any way.
** 
** The PreFuncP is called before the packet is enqueued on the host rup.
** PreFuncP is called as (*PreFuncP)(PreArg, CmdBlkP);. PreFuncP must
** return !RIO_FAIL to have the packet queued on the rup, and RIO_FAIL
** if the packet is NOT to be queued.
** 
** The PostFuncP is called when the command has completed. It is called
** as (*PostFuncP)(PostArg, CmdBlkP, txcontrol);. PostFuncP is not expected
** to return a value. PostFuncP does NOT need to free the command block,
** as this happens automatically after PostFuncP returns.
** 
** Once the command block has been filled in, it is attached to the correct
** queue by calling RIOQueueCmdBlk( HostP, Rup, CmdBlkP ) where HostP is
** a pointer to the struct Host, Rup is the NUMBER of the rup (NOT a pointer
** to it!), and CmdBlkP is the pointer to the command block allocated using
** RIOGetCmdBlk().
** 
*/