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kernel-fxtec-pro1x/drivers/char/rio/rioroute.c
Al Viro d886cb586f [PATCH] trivial annotations in rio 
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2006-05-27 02:26:14 -04:00

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/*
** -----------------------------------------------------------------------------
**
** 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 : rioroute.c
** SID : 1.3
** Last Modified : 11/6/98 10:33:46
** Retrieved : 11/6/98 10:33:50
**
** ident @(#)rioroute.c 1.3
**
** -----------------------------------------------------------------------------
*/
#ifdef SCCS_LABELS
static char *_rioroute_c_sccs_ = "@(#)rioroute.c 1.3";
#endif
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/errno.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 "pkt.h"
#include "daemon.h"
#include "rio.h"
#include "riospace.h"
#include "cmdpkt.h"
#include "map.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 "phb.h"
#include "link.h"
#include "cmdblk.h"
#include "route.h"
#include "cirrus.h"
#include "rioioctl.h"
#include "param.h"
static int RIOCheckIsolated(struct rio_info *, struct Host *, unsigned int);
static int RIOIsolate(struct rio_info *, struct Host *, unsigned int);
static int RIOCheck(struct Host *, unsigned int);
static void RIOConCon(struct rio_info *, struct Host *, unsigned int, unsigned int, unsigned int, unsigned int, int);
/*
** Incoming on the ROUTE_RUP
** I wrote this while I was tired. Forgive me.
*/
int RIORouteRup(struct rio_info *p, unsigned int Rup, struct Host *HostP, struct PKT __iomem * PacketP)
{
struct PktCmd __iomem *PktCmdP = (struct PktCmd __iomem *) PacketP->data;
struct PktCmd_M *PktReplyP;
struct CmdBlk *CmdBlkP;
struct Port *PortP;
struct Map *MapP;
struct Top *TopP;
int ThisLink, ThisLinkMin, ThisLinkMax;
int port;
int Mod, Mod1, Mod2;
unsigned short RtaType;
unsigned int RtaUniq;
unsigned int ThisUnit, ThisUnit2; /* 2 ids to accommodate 16 port RTA */
unsigned int OldUnit, NewUnit, OldLink, NewLink;
char *MyType, *MyName;
int Lies;
unsigned long flags;
/*
** Is this unit telling us it's current link topology?
*/
if (readb(&PktCmdP->Command) == ROUTE_TOPOLOGY) {
MapP = HostP->Mapping;
/*
** The packet can be sent either by the host or by an RTA.
** If it comes from the host, then we need to fill in the
** Topology array in the host structure. If it came in
** from an RTA then we need to fill in the Mapping structure's
** Topology array for the unit.
*/
if (Rup >= (unsigned short) MAX_RUP) {
ThisUnit = HOST_ID;
TopP = HostP->Topology;
MyType = "Host";
MyName = HostP->Name;
ThisLinkMin = ThisLinkMax = Rup - MAX_RUP;
} else {
ThisUnit = Rup + 1;
TopP = HostP->Mapping[Rup].Topology;
MyType = "RTA";
MyName = HostP->Mapping[Rup].Name;
ThisLinkMin = 0;
ThisLinkMax = LINKS_PER_UNIT - 1;
}
/*
** Lies will not be tolerated.
** If any pair of links claim to be connected to the same
** place, then ignore this packet completely.
*/
Lies = 0;
for (ThisLink = ThisLinkMin + 1; ThisLink <= ThisLinkMax; ThisLink++) {
/*
** it won't lie about network interconnect, total disconnects
** and no-IDs. (or at least, it doesn't *matter* if it does)
*/
if (readb(&PktCmdP->RouteTopology[ThisLink].Unit) > (unsigned short) MAX_RUP)
continue;
for (NewLink = ThisLinkMin; NewLink < ThisLink; NewLink++) {
if ((readb(&PktCmdP->RouteTopology[ThisLink].Unit) == readb(&PktCmdP->RouteTopology[NewLink].Unit)) && (readb(&PktCmdP->RouteTopology[ThisLink].Link) == readb(&PktCmdP->RouteTopology[NewLink].Link))) {
Lies++;
}
}
}
if (Lies) {
rio_dprintk(RIO_DEBUG_ROUTE, "LIES! DAMN LIES! %d LIES!\n", Lies);
rio_dprintk(RIO_DEBUG_ROUTE, "%d:%c %d:%c %d:%c %d:%c\n",
readb(&PktCmdP->RouteTopology[0].Unit),
'A' + readb(&PktCmdP->RouteTopology[0].Link),
readb(&PktCmdP->RouteTopology[1].Unit),
'A' + readb(&PktCmdP->RouteTopology[1].Link), readb(&PktCmdP->RouteTopology[2].Unit), 'A' + readb(&PktCmdP->RouteTopology[2].Link), readb(&PktCmdP->RouteTopology[3].Unit), 'A' + readb(&PktCmdP->RouteTopology[3].Link));
return 1;
}
/*
** now, process each link.
*/
for (ThisLink = ThisLinkMin; ThisLink <= ThisLinkMax; ThisLink++) {
/*
** this is what it was connected to
*/
OldUnit = TopP[ThisLink].Unit;
OldLink = TopP[ThisLink].Link;
/*
** this is what it is now connected to
*/
NewUnit = readb(&PktCmdP->RouteTopology[ThisLink].Unit);
NewLink = readb(&PktCmdP->RouteTopology[ThisLink].Link);
if (OldUnit != NewUnit || OldLink != NewLink) {
/*
** something has changed!
*/
if (NewUnit > MAX_RUP && NewUnit != ROUTE_DISCONNECT && NewUnit != ROUTE_NO_ID && NewUnit != ROUTE_INTERCONNECT) {
rio_dprintk(RIO_DEBUG_ROUTE, "I have a link from %s %s to unit %d:%d - I don't like it.\n", MyType, MyName, NewUnit, NewLink);
} else {
/*
** put the new values in
*/
TopP[ThisLink].Unit = NewUnit;
TopP[ThisLink].Link = NewLink;
RIOSetChange(p);
if (OldUnit <= MAX_RUP) {
/*
** If something has become bust, then re-enable them messages
*/
if (!p->RIONoMessage)
RIOConCon(p, HostP, ThisUnit, ThisLink, OldUnit, OldLink, DISCONNECT);
}
if ((NewUnit <= MAX_RUP) && !p->RIONoMessage)
RIOConCon(p, HostP, ThisUnit, ThisLink, NewUnit, NewLink, CONNECT);
if (NewUnit == ROUTE_NO_ID)
rio_dprintk(RIO_DEBUG_ROUTE, "%s %s (%c) is connected to an unconfigured unit.\n", MyType, MyName, 'A' + ThisLink);
if (NewUnit == ROUTE_INTERCONNECT) {
if (!p->RIONoMessage)
printk(KERN_DEBUG "rio: %s '%s' (%c) is connected to another network.\n", MyType, MyName, 'A' + ThisLink);
}
/*
** perform an update for 'the other end', so that these messages
** only appears once. Only disconnect the other end if it is pointing
** at us!
*/
if (OldUnit == HOST_ID) {
if (HostP->Topology[OldLink].Unit == ThisUnit && HostP->Topology[OldLink].Link == ThisLink) {
rio_dprintk(RIO_DEBUG_ROUTE, "SETTING HOST (%c) TO DISCONNECTED!\n", OldLink + 'A');
HostP->Topology[OldLink].Unit = ROUTE_DISCONNECT;
HostP->Topology[OldLink].Link = NO_LINK;
} else {
rio_dprintk(RIO_DEBUG_ROUTE, "HOST(%c) WAS NOT CONNECTED TO %s (%c)!\n", OldLink + 'A', HostP->Mapping[ThisUnit - 1].Name, ThisLink + 'A');
}
} else if (OldUnit <= MAX_RUP) {
if (HostP->Mapping[OldUnit - 1].Topology[OldLink].Unit == ThisUnit && HostP->Mapping[OldUnit - 1].Topology[OldLink].Link == ThisLink) {
rio_dprintk(RIO_DEBUG_ROUTE, "SETTING RTA %s (%c) TO DISCONNECTED!\n", HostP->Mapping[OldUnit - 1].Name, OldLink + 'A');
HostP->Mapping[OldUnit - 1].Topology[OldLink].Unit = ROUTE_DISCONNECT;
HostP->Mapping[OldUnit - 1].Topology[OldLink].Link = NO_LINK;
} else {
rio_dprintk(RIO_DEBUG_ROUTE, "RTA %s (%c) WAS NOT CONNECTED TO %s (%c)\n", HostP->Mapping[OldUnit - 1].Name, OldLink + 'A', HostP->Mapping[ThisUnit - 1].Name, ThisLink + 'A');
}
}
if (NewUnit == HOST_ID) {
rio_dprintk(RIO_DEBUG_ROUTE, "MARKING HOST (%c) CONNECTED TO %s (%c)\n", NewLink + 'A', MyName, ThisLink + 'A');
HostP->Topology[NewLink].Unit = ThisUnit;
HostP->Topology[NewLink].Link = ThisLink;
} else if (NewUnit <= MAX_RUP) {
rio_dprintk(RIO_DEBUG_ROUTE, "MARKING RTA %s (%c) CONNECTED TO %s (%c)\n", HostP->Mapping[NewUnit - 1].Name, NewLink + 'A', MyName, ThisLink + 'A');
HostP->Mapping[NewUnit - 1].Topology[NewLink].Unit = ThisUnit;
HostP->Mapping[NewUnit - 1].Topology[NewLink].Link = ThisLink;
}
}
RIOSetChange(p);
RIOCheckIsolated(p, HostP, OldUnit);
}
}
return 1;
}
/*
** The only other command we recognise is a route_request command
*/
if (readb(&PktCmdP->Command) != ROUTE_REQUEST) {
rio_dprintk(RIO_DEBUG_ROUTE, "Unknown command %d received on rup %d host %p ROUTE_RUP\n", readb(&PktCmdP->Command), Rup, HostP);
return 1;
}
RtaUniq = (readb(&PktCmdP->UniqNum[0])) + (readb(&PktCmdP->UniqNum[1]) << 8) + (readb(&PktCmdP->UniqNum[2]) << 16) + (readb(&PktCmdP->UniqNum[3]) << 24);
/*
** Determine if 8 or 16 port RTA
*/
RtaType = GetUnitType(RtaUniq);
rio_dprintk(RIO_DEBUG_ROUTE, "Received a request for an ID for serial number %x\n", RtaUniq);
Mod = readb(&PktCmdP->ModuleTypes);
Mod1 = LONYBLE(Mod);
if (RtaType == TYPE_RTA16) {
/*
** Only one ident is set for a 16 port RTA. To make compatible
** with 8 port, set 2nd ident in Mod2 to the same as Mod1.
*/
Mod2 = Mod1;
rio_dprintk(RIO_DEBUG_ROUTE, "Backplane type is %s (all ports)\n", p->RIOModuleTypes[Mod1].Name);
} else {
Mod2 = HINYBLE(Mod);
rio_dprintk(RIO_DEBUG_ROUTE, "Module types are %s (ports 0-3) and %s (ports 4-7)\n", p->RIOModuleTypes[Mod1].Name, p->RIOModuleTypes[Mod2].Name);
}
/*
** try to unhook a command block from the command free list.
*/
if (!(CmdBlkP = RIOGetCmdBlk())) {
rio_dprintk(RIO_DEBUG_ROUTE, "No command blocks to route RTA! come back later.\n");
return 0;
}
/*
** Fill in the default info on the command block
*/
CmdBlkP->Packet.dest_unit = Rup;
CmdBlkP->Packet.dest_port = ROUTE_RUP;
CmdBlkP->Packet.src_unit = HOST_ID;
CmdBlkP->Packet.src_port = ROUTE_RUP;
CmdBlkP->Packet.len = PKT_CMD_BIT | 1;
CmdBlkP->PreFuncP = CmdBlkP->PostFuncP = NULL;
PktReplyP = (struct PktCmd_M *) CmdBlkP->Packet.data;
if (!RIOBootOk(p, HostP, RtaUniq)) {
rio_dprintk(RIO_DEBUG_ROUTE, "RTA %x tried to get an ID, but does not belong - FOAD it!\n", RtaUniq);
PktReplyP->Command = ROUTE_FOAD;
HostP->Copy("RT_FOAD", PktReplyP->CommandText, 7);
RIOQueueCmdBlk(HostP, Rup, CmdBlkP);
return 1;
}
/*
** Check to see if the RTA is configured for this host
*/
for (ThisUnit = 0; ThisUnit < MAX_RUP; ThisUnit++) {
rio_dprintk(RIO_DEBUG_ROUTE, "Entry %d Flags=%s %s UniqueNum=0x%x\n",
ThisUnit, HostP->Mapping[ThisUnit].Flags & SLOT_IN_USE ? "Slot-In-Use" : "Not In Use", HostP->Mapping[ThisUnit].Flags & SLOT_TENTATIVE ? "Slot-Tentative" : "Not Tentative", HostP->Mapping[ThisUnit].RtaUniqueNum);
/*
** We have an entry for it.
*/
if ((HostP->Mapping[ThisUnit].Flags & (SLOT_IN_USE | SLOT_TENTATIVE)) && (HostP->Mapping[ThisUnit].RtaUniqueNum == RtaUniq)) {
if (RtaType == TYPE_RTA16) {
ThisUnit2 = HostP->Mapping[ThisUnit].ID2 - 1;
rio_dprintk(RIO_DEBUG_ROUTE, "Found unit 0x%x at slots %d+%d\n", RtaUniq, ThisUnit, ThisUnit2);
} else
rio_dprintk(RIO_DEBUG_ROUTE, "Found unit 0x%x at slot %d\n", RtaUniq, ThisUnit);
/*
** If we have no knowledge of booting it, then the host has
** been re-booted, and so we must kill the RTA, so that it
** will be booted again (potentially with new bins)
** and it will then re-ask for an ID, which we will service.
*/
if ((HostP->Mapping[ThisUnit].Flags & SLOT_IN_USE) && !(HostP->Mapping[ThisUnit].Flags & RTA_BOOTED)) {
if (!(HostP->Mapping[ThisUnit].Flags & MSG_DONE)) {
if (!p->RIONoMessage)
printk(KERN_DEBUG "rio: RTA '%s' is being updated.\n", HostP->Mapping[ThisUnit].Name);
HostP->Mapping[ThisUnit].Flags |= MSG_DONE;
}
PktReplyP->Command = ROUTE_FOAD;
HostP->Copy("RT_FOAD", PktReplyP->CommandText, 7);
RIOQueueCmdBlk(HostP, Rup, CmdBlkP);
return 1;
}
/*
** Send the ID (entry) to this RTA. The ID number is implicit as
** the offset into the table. It is worth noting at this stage
** that offset zero in the table contains the entries for the
** RTA with ID 1!!!!
*/
PktReplyP->Command = ROUTE_ALLOCATE;
PktReplyP->IDNum = ThisUnit + 1;
if (RtaType == TYPE_RTA16) {
if (HostP->Mapping[ThisUnit].Flags & SLOT_IN_USE)
/*
** Adjust the phb and tx pkt dest_units for 2nd block of 8
** only if the RTA has ports associated (SLOT_IN_USE)
*/
RIOFixPhbs(p, HostP, ThisUnit2);
PktReplyP->IDNum2 = ThisUnit2 + 1;
rio_dprintk(RIO_DEBUG_ROUTE, "RTA '%s' has been allocated IDs %d+%d\n", HostP->Mapping[ThisUnit].Name, PktReplyP->IDNum, PktReplyP->IDNum2);
} else {
PktReplyP->IDNum2 = ROUTE_NO_ID;
rio_dprintk(RIO_DEBUG_ROUTE, "RTA '%s' has been allocated ID %d\n", HostP->Mapping[ThisUnit].Name, PktReplyP->IDNum);
}
HostP->Copy("RT_ALLOCAT", PktReplyP->CommandText, 10);
RIOQueueCmdBlk(HostP, Rup, CmdBlkP);
/*
** If this is a freshly booted RTA, then we need to re-open
** the ports, if any where open, so that data may once more
** flow around the system!
*/
if ((HostP->Mapping[ThisUnit].Flags & RTA_NEWBOOT) && (HostP->Mapping[ThisUnit].SysPort != NO_PORT)) {
/*
** look at the ports associated with this beast and
** see if any where open. If they was, then re-open
** them, using the info from the tty flags.
*/
for (port = 0; port < PORTS_PER_RTA; port++) {
PortP = p->RIOPortp[port + HostP->Mapping[ThisUnit].SysPort];
if (PortP->State & (RIO_MOPEN | RIO_LOPEN)) {
rio_dprintk(RIO_DEBUG_ROUTE, "Re-opened this port\n");
rio_spin_lock_irqsave(&PortP->portSem, flags);
PortP->MagicFlags |= MAGIC_REBOOT;
rio_spin_unlock_irqrestore(&PortP->portSem, flags);
}
}
if (RtaType == TYPE_RTA16) {
for (port = 0; port < PORTS_PER_RTA; port++) {
PortP = p->RIOPortp[port + HostP->Mapping[ThisUnit2].SysPort];
if (PortP->State & (RIO_MOPEN | RIO_LOPEN)) {
rio_dprintk(RIO_DEBUG_ROUTE, "Re-opened this port\n");
rio_spin_lock_irqsave(&PortP->portSem, flags);
PortP->MagicFlags |= MAGIC_REBOOT;
rio_spin_unlock_irqrestore(&PortP->portSem, flags);
}
}
}
}
/*
** keep a copy of the module types!
*/
HostP->UnixRups[ThisUnit].ModTypes = Mod;
if (RtaType == TYPE_RTA16)
HostP->UnixRups[ThisUnit2].ModTypes = Mod;
/*
** If either of the modules on this unit is read-only or write-only
** or none-xprint, then we need to transfer that info over to the
** relevant ports.
*/
if (HostP->Mapping[ThisUnit].SysPort != NO_PORT) {
for (port = 0; port < PORTS_PER_MODULE; port++) {
p->RIOPortp[port + HostP->Mapping[ThisUnit].SysPort]->Config &= ~RIO_NOMASK;
p->RIOPortp[port + HostP->Mapping[ThisUnit].SysPort]->Config |= p->RIOModuleTypes[Mod1].Flags[port];
p->RIOPortp[port + PORTS_PER_MODULE + HostP->Mapping[ThisUnit].SysPort]->Config &= ~RIO_NOMASK;
p->RIOPortp[port + PORTS_PER_MODULE + HostP->Mapping[ThisUnit].SysPort]->Config |= p->RIOModuleTypes[Mod2].Flags[port];
}
if (RtaType == TYPE_RTA16) {
for (port = 0; port < PORTS_PER_MODULE; port++) {
p->RIOPortp[port + HostP->Mapping[ThisUnit2].SysPort]->Config &= ~RIO_NOMASK;
p->RIOPortp[port + HostP->Mapping[ThisUnit2].SysPort]->Config |= p->RIOModuleTypes[Mod1].Flags[port];
p->RIOPortp[port + PORTS_PER_MODULE + HostP->Mapping[ThisUnit2].SysPort]->Config &= ~RIO_NOMASK;
p->RIOPortp[port + PORTS_PER_MODULE + HostP->Mapping[ThisUnit2].SysPort]->Config |= p->RIOModuleTypes[Mod2].Flags[port];
}
}
}
/*
** Job done, get on with the interrupts!
*/
return 1;
}
}
/*
** There is no table entry for this RTA at all.
**
** Lets check to see if we actually booted this unit - if not,
** then we reset it and it will go round the loop of being booted
** we can then worry about trying to fit it into the table.
*/
for (ThisUnit = 0; ThisUnit < HostP->NumExtraBooted; ThisUnit++)
if (HostP->ExtraUnits[ThisUnit] == RtaUniq)
break;
if (ThisUnit == HostP->NumExtraBooted && ThisUnit != MAX_EXTRA_UNITS) {
/*
** if the unit wasn't in the table, and the table wasn't full, then
** we reset the unit, because we didn't boot it.
** However, if the table is full, it could be that we did boot
** this unit, and so we won't reboot it, because it isn't really
** all that disasterous to keep the old bins in most cases. This
** is a rather tacky feature, but we are on the edge of reallity
** here, because the implication is that someone has connected
** 16+MAX_EXTRA_UNITS onto one host.
*/
static int UnknownMesgDone = 0;
if (!UnknownMesgDone) {
if (!p->RIONoMessage)
printk(KERN_DEBUG "rio: One or more unknown RTAs are being updated.\n");
UnknownMesgDone = 1;
}
PktReplyP->Command = ROUTE_FOAD;
HostP->Copy("RT_FOAD", PktReplyP->CommandText, 7);
} else {
/*
** we did boot it (as an extra), and there may now be a table
** slot free (because of a delete), so we will try to make
** a tentative entry for it, so that the configurator can see it
** and fill in the details for us.
*/
if (RtaType == TYPE_RTA16) {
if (RIOFindFreeID(p, HostP, &ThisUnit, &ThisUnit2) == 0) {
RIODefaultName(p, HostP, ThisUnit);
rio_fill_host_slot(ThisUnit, ThisUnit2, RtaUniq, HostP);
}
} else {
if (RIOFindFreeID(p, HostP, &ThisUnit, NULL) == 0) {
RIODefaultName(p, HostP, ThisUnit);
rio_fill_host_slot(ThisUnit, 0, RtaUniq, HostP);
}
}
PktReplyP->Command = ROUTE_USED;
HostP->Copy("RT_USED", PktReplyP->CommandText, 7);
}
RIOQueueCmdBlk(HostP, Rup, CmdBlkP);
return 1;
}
void RIOFixPhbs(struct rio_info *p, struct Host *HostP, unsigned int unit)
{
unsigned short link, port;
struct Port *PortP;
unsigned long flags;
int PortN = HostP->Mapping[unit].SysPort;
rio_dprintk(RIO_DEBUG_ROUTE, "RIOFixPhbs unit %d sysport %d\n", unit, PortN);
if (PortN != -1) {
unsigned short dest_unit = HostP->Mapping[unit].ID2;
/*
** Get the link number used for the 1st 8 phbs on this unit.
*/
PortP = p->RIOPortp[HostP->Mapping[dest_unit - 1].SysPort];
link = readw(&PortP->PhbP->link);
for (port = 0; port < PORTS_PER_RTA; port++, PortN++) {
unsigned short dest_port = port + 8;
u16 __iomem *TxPktP;
struct PKT __iomem *Pkt;
PortP = p->RIOPortp[PortN];
rio_spin_lock_irqsave(&PortP->portSem, flags);
/*
** If RTA is not powered on, the tx packets will be
** unset, so go no further.
*/
if (PortP->TxStart == 0) {
rio_dprintk(RIO_DEBUG_ROUTE, "Tx pkts not set up yet\n");
rio_spin_unlock_irqrestore(&PortP->portSem, flags);
break;
}
/*
** For the second slot of a 16 port RTA, the driver needs to
** sort out the phb to port mappings. The dest_unit for this
** group of 8 phbs is set to the dest_unit of the accompanying
** 8 port block. The dest_port of the second unit is set to
** be in the range 8-15 (i.e. 8 is added). Thus, for a 16 port
** RTA with IDs 5 and 6, traffic bound for port 6 of unit 6
** (being the second map ID) will be sent to dest_unit 5, port
** 14. When this RTA is deleted, dest_unit for ID 6 will be
** restored, and the dest_port will be reduced by 8.
** Transmit packets also have a destination field which needs
** adjusting in the same manner.
** Note that the unit/port bytes in 'dest' are swapped.
** We also need to adjust the phb and rup link numbers for the
** second block of 8 ttys.
*/
for (TxPktP = PortP->TxStart; TxPktP <= PortP->TxEnd; TxPktP++) {
/*
** *TxPktP is the pointer to the transmit packet on the host
** card. This needs to be translated into a 32 bit pointer
** so it can be accessed from the driver.
*/
Pkt = (struct PKT __iomem *) RIO_PTR(HostP->Caddr, readw(TxPktP));
/*
** If the packet is used, reset it.
*/
Pkt = (struct PKT __iomem *) ((unsigned long) Pkt & ~PKT_IN_USE);
writeb(dest_unit, &Pkt->dest_unit);
writeb(dest_port, &Pkt->dest_port);
}
rio_dprintk(RIO_DEBUG_ROUTE, "phb dest: Old %x:%x New %x:%x\n", readw(&PortP->PhbP->destination) & 0xff, (readw(&PortP->PhbP->destination) >> 8) & 0xff, dest_unit, dest_port);
writew(dest_unit + (dest_port << 8), &PortP->PhbP->destination);
writew(link, &PortP->PhbP->link);
rio_spin_unlock_irqrestore(&PortP->portSem, flags);
}
/*
** Now make sure the range of ports to be serviced includes
** the 2nd 8 on this 16 port RTA.
*/
if (link > 3)
return;
if (((unit * 8) + 7) > readw(&HostP->LinkStrP[link].last_port)) {
rio_dprintk(RIO_DEBUG_ROUTE, "last port on host link %d: %d\n", link, (unit * 8) + 7);
writew((unit * 8) + 7, &HostP->LinkStrP[link].last_port);
}
}
}
/*
** Check to see if the new disconnection has isolated this unit.
** If it has, then invalidate all its link information, and tell
** the world about it. This is done to ensure that the configurator
** only gets up-to-date information about what is going on.
*/
static int RIOCheckIsolated(struct rio_info *p, struct Host *HostP, unsigned int UnitId)
{
unsigned long flags;
rio_spin_lock_irqsave(&HostP->HostLock, flags);
if (RIOCheck(HostP, UnitId)) {
rio_dprintk(RIO_DEBUG_ROUTE, "Unit %d is NOT isolated\n", UnitId);
rio_spin_unlock_irqrestore(&HostP->HostLock, flags);
return (0);
}
RIOIsolate(p, HostP, UnitId);
RIOSetChange(p);
rio_spin_unlock_irqrestore(&HostP->HostLock, flags);
return 1;
}
/*
** Invalidate all the link interconnectivity of this unit, and of
** all the units attached to it. This will mean that the entire
** subnet will re-introduce itself.
*/
static int RIOIsolate(struct rio_info *p, struct Host *HostP, unsigned int UnitId)
{
unsigned int link, unit;
UnitId--; /* this trick relies on the Unit Id being UNSIGNED! */
if (UnitId >= MAX_RUP) /* dontcha just lurv unsigned maths! */
return (0);
if (HostP->Mapping[UnitId].Flags & BEEN_HERE)
return (0);
HostP->Mapping[UnitId].Flags |= BEEN_HERE;
if (p->RIOPrintDisabled == DO_PRINT)
rio_dprintk(RIO_DEBUG_ROUTE, "RIOMesgIsolated %s", HostP->Mapping[UnitId].Name);
for (link = 0; link < LINKS_PER_UNIT; link++) {
unit = HostP->Mapping[UnitId].Topology[link].Unit;
HostP->Mapping[UnitId].Topology[link].Unit = ROUTE_DISCONNECT;
HostP->Mapping[UnitId].Topology[link].Link = NO_LINK;
RIOIsolate(p, HostP, unit);
}
HostP->Mapping[UnitId].Flags &= ~BEEN_HERE;
return 1;
}
static int RIOCheck(struct Host *HostP, unsigned int UnitId)
{
unsigned char link;
/* rio_dprint(RIO_DEBUG_ROUTE, ("Check to see if unit %d has a route to the host\n",UnitId)); */
rio_dprintk(RIO_DEBUG_ROUTE, "RIOCheck : UnitID = %d\n", UnitId);
if (UnitId == HOST_ID) {
/* rio_dprint(RIO_DEBUG_ROUTE, ("Unit %d is NOT isolated - it IS the host!\n", UnitId)); */
return 1;
}
UnitId--;
if (UnitId >= MAX_RUP) {
/* rio_dprint(RIO_DEBUG_ROUTE, ("Unit %d - ignored.\n", UnitId)); */
return 0;
}
for (link = 0; link < LINKS_PER_UNIT; link++) {
if (HostP->Mapping[UnitId].Topology[link].Unit == HOST_ID) {
/* rio_dprint(RIO_DEBUG_ROUTE, ("Unit %d is connected directly to host via link (%c).\n",
UnitId, 'A'+link)); */
return 1;
}
}
if (HostP->Mapping[UnitId].Flags & BEEN_HERE) {
/* rio_dprint(RIO_DEBUG_ROUTE, ("Been to Unit %d before - ignoring\n", UnitId)); */
return 0;
}
HostP->Mapping[UnitId].Flags |= BEEN_HERE;
for (link = 0; link < LINKS_PER_UNIT; link++) {
/* rio_dprint(RIO_DEBUG_ROUTE, ("Unit %d check link (%c)\n", UnitId,'A'+link)); */
if (RIOCheck(HostP, HostP->Mapping[UnitId].Topology[link].Unit)) {
/* rio_dprint(RIO_DEBUG_ROUTE, ("Unit %d is connected to something that knows the host via link (%c)\n", UnitId,link+'A')); */
HostP->Mapping[UnitId].Flags &= ~BEEN_HERE;
return 1;
}
}
HostP->Mapping[UnitId].Flags &= ~BEEN_HERE;
/* rio_dprint(RIO_DEBUG_ROUTE, ("Unit %d DOESNT KNOW THE HOST!\n", UnitId)); */
return 0;
}
/*
** Returns the type of unit (host, 16/8 port RTA)
*/
unsigned int GetUnitType(unsigned int Uniq)
{
switch ((Uniq >> 28) & 0xf) {
case RIO_AT:
case RIO_MCA:
case RIO_EISA:
case RIO_PCI:
rio_dprintk(RIO_DEBUG_ROUTE, "Unit type: Host\n");
return (TYPE_HOST);
case RIO_RTA_16:
rio_dprintk(RIO_DEBUG_ROUTE, "Unit type: 16 port RTA\n");
return (TYPE_RTA16);
case RIO_RTA:
rio_dprintk(RIO_DEBUG_ROUTE, "Unit type: 8 port RTA\n");
return (TYPE_RTA8);
default:
rio_dprintk(RIO_DEBUG_ROUTE, "Unit type: Unrecognised\n");
return (99);
}
}
int RIOSetChange(struct rio_info *p)
{
if (p->RIOQuickCheck != NOT_CHANGED)
return (0);
p->RIOQuickCheck = CHANGED;
if (p->RIOSignalProcess) {
rio_dprintk(RIO_DEBUG_ROUTE, "Send SIG-HUP");
/*
psignal( RIOSignalProcess, SIGHUP );
*/
}
return (0);
}
static void RIOConCon(struct rio_info *p,
struct Host *HostP,
unsigned int FromId,
unsigned int FromLink,
unsigned int ToId,
unsigned int ToLink,
int Change)
{
char *FromName;
char *FromType;
char *ToName;
char *ToType;
unsigned int tp;
/*
** 15.10.1998 ARG - ESIL 0759
** (Part) fix for port being trashed when opened whilst RTA "disconnected"
**
** What's this doing in here anyway ?
** It was causing the port to be 'unmapped' if opened whilst RTA "disconnected"
**
** 09.12.1998 ARG - ESIL 0776 - part fix
** Okay, We've found out what this was all about now !
** Someone had botched this to use RIOHalted to indicated the number of RTAs
** 'disconnected'. The value in RIOHalted was then being used in the
** 'RIO_QUICK_CHECK' ioctl. A none zero value indicating that a least one RTA
** is 'disconnected'. The change was put in to satisfy a customer's needs.
** Having taken this bit of code out 'RIO_QUICK_CHECK' now no longer works for
** the customer.
**
if (Change == CONNECT) {
if (p->RIOHalted) p->RIOHalted --;
}
else {
p->RIOHalted ++;
}
**
** So - we need to implement it slightly differently - a new member of the
** rio_info struct - RIORtaDisCons (RIO RTA connections) keeps track of RTA
** connections and disconnections.
*/
if (Change == CONNECT) {
if (p->RIORtaDisCons)
p->RIORtaDisCons--;
} else {
p->RIORtaDisCons++;
}
if (p->RIOPrintDisabled == DONT_PRINT)
return;
if (FromId > ToId) {
tp = FromId;
FromId = ToId;
ToId = tp;
tp = FromLink;
FromLink = ToLink;
ToLink = tp;
}
FromName = FromId ? HostP->Mapping[FromId - 1].Name : HostP->Name;
FromType = FromId ? "RTA" : "HOST";
ToName = ToId ? HostP->Mapping[ToId - 1].Name : HostP->Name;
ToType = ToId ? "RTA" : "HOST";
rio_dprintk(RIO_DEBUG_ROUTE, "Link between %s '%s' (%c) and %s '%s' (%c) %s.\n", FromType, FromName, 'A' + FromLink, ToType, ToName, 'A' + ToLink, (Change == CONNECT) ? "established" : "disconnected");
printk(KERN_DEBUG "rio: Link between %s '%s' (%c) and %s '%s' (%c) %s.\n", FromType, FromName, 'A' + FromLink, ToType, ToName, 'A' + ToLink, (Change == CONNECT) ? "established" : "disconnected");
}
/*
** RIORemoveFromSavedTable :
**
** Delete and RTA entry from the saved table given to us
** by the configuration program.
*/
static int RIORemoveFromSavedTable(struct rio_info *p, struct Map *pMap)
{
int entry;
/*
** We loop for all entries even after finding an entry and
** zeroing it because we may have two entries to delete if
** it's a 16 port RTA.
*/
for (entry = 0; entry < TOTAL_MAP_ENTRIES; entry++) {
if (p->RIOSavedTable[entry].RtaUniqueNum == pMap->RtaUniqueNum) {
memset(&p->RIOSavedTable[entry], 0, sizeof(struct Map));
}
}
return 0;
}
/*
** RIOCheckDisconnected :
**
** Scan the unit links to and return zero if the unit is completely
** disconnected.
*/
static int RIOFreeDisconnected(struct rio_info *p, struct Host *HostP, int unit)
{
int link;
rio_dprintk(RIO_DEBUG_ROUTE, "RIOFreeDisconnect unit %d\n", unit);
/*
** If the slot is tentative and does not belong to the
** second half of a 16 port RTA then scan to see if
** is disconnected.
*/
for (link = 0; link < LINKS_PER_UNIT; link++) {
if (HostP->Mapping[unit].Topology[link].Unit != ROUTE_DISCONNECT)
break;
}
/*
** If not all links are disconnected then we can forget about it.
*/
if (link < LINKS_PER_UNIT)
return 1;
#ifdef NEED_TO_FIX_THIS
/* Ok so all the links are disconnected. But we may have only just
** made this slot tentative and not yet received a topology update.
** Lets check how long ago we made it tentative.
*/
rio_dprintk(RIO_DEBUG_ROUTE, "Just about to check LBOLT on entry %d\n", unit);
if (drv_getparm(LBOLT, (ulong_t *) & current_time))
rio_dprintk(RIO_DEBUG_ROUTE, "drv_getparm(LBOLT,....) Failed.\n");
elapse_time = current_time - TentTime[unit];
rio_dprintk(RIO_DEBUG_ROUTE, "elapse %d = current %d - tent %d (%d usec)\n", elapse_time, current_time, TentTime[unit], drv_hztousec(elapse_time));
if (drv_hztousec(elapse_time) < WAIT_TO_FINISH) {
rio_dprintk(RIO_DEBUG_ROUTE, "Skipping slot %d, not timed out yet %d\n", unit, drv_hztousec(elapse_time));
return 1;
}
#endif
/*
** We have found an usable slot.
** If it is half of a 16 port RTA then delete the other half.
*/
if (HostP->Mapping[unit].ID2 != 0) {
int nOther = (HostP->Mapping[unit].ID2) - 1;
rio_dprintk(RIO_DEBUG_ROUTE, "RioFreedis second slot %d.\n", nOther);
memset(&HostP->Mapping[nOther], 0, sizeof(struct Map));
}
RIORemoveFromSavedTable(p, &HostP->Mapping[unit]);
return 0;
}
/*
** RIOFindFreeID :
**
** This function scans the given host table for either one
** or two free unit ID's.
*/
int RIOFindFreeID(struct rio_info *p, struct Host *HostP, unsigned int * pID1, unsigned int * pID2)
{
int unit, tempID;
/*
** Initialise the ID's to MAX_RUP.
** We do this to make the loop for setting the ID's as simple as
** possible.
*/
*pID1 = MAX_RUP;
if (pID2 != NULL)
*pID2 = MAX_RUP;
/*
** Scan all entries of the host mapping table for free slots.
** We scan for free slots first and then if that is not successful
** we start all over again looking for tentative slots we can re-use.
*/
for (unit = 0; unit < MAX_RUP; unit++) {
rio_dprintk(RIO_DEBUG_ROUTE, "Scanning unit %d\n", unit);
/*
** If the flags are zero then the slot is empty.
*/
if (HostP->Mapping[unit].Flags == 0) {
rio_dprintk(RIO_DEBUG_ROUTE, " This slot is empty.\n");
/*
** If we haven't allocated the first ID then do it now.
*/
if (*pID1 == MAX_RUP) {
rio_dprintk(RIO_DEBUG_ROUTE, "Make tentative entry for first unit %d\n", unit);
*pID1 = unit;
/*
** If the second ID is not needed then we can return
** now.
*/
if (pID2 == NULL)
return 0;
} else {
/*
** Allocate the second slot and return.
*/
rio_dprintk(RIO_DEBUG_ROUTE, "Make tentative entry for second unit %d\n", unit);
*pID2 = unit;
return 0;
}
}
}
/*
** If we manage to come out of the free slot loop then we
** need to start all over again looking for tentative slots
** that we can re-use.
*/
rio_dprintk(RIO_DEBUG_ROUTE, "Starting to scan for tentative slots\n");
for (unit = 0; unit < MAX_RUP; unit++) {
if (((HostP->Mapping[unit].Flags & SLOT_TENTATIVE) || (HostP->Mapping[unit].Flags == 0)) && !(HostP->Mapping[unit].Flags & RTA16_SECOND_SLOT)) {
rio_dprintk(RIO_DEBUG_ROUTE, " Slot %d looks promising.\n", unit);
if (unit == *pID1) {
rio_dprintk(RIO_DEBUG_ROUTE, " No it isn't, its the 1st half\n");
continue;
}
/*
** Slot is Tentative or Empty, but not a tentative second
** slot of a 16 porter.
** Attempt to free up this slot (and its parnter if
** it is a 16 port slot. The second slot will become
** empty after a call to RIOFreeDisconnected so thats why
** we look for empty slots above as well).
*/
if (HostP->Mapping[unit].Flags != 0)
if (RIOFreeDisconnected(p, HostP, unit) != 0)
continue;
/*
** If we haven't allocated the first ID then do it now.
*/
if (*pID1 == MAX_RUP) {
rio_dprintk(RIO_DEBUG_ROUTE, "Grab tentative entry for first unit %d\n", unit);
*pID1 = unit;
/*
** Clear out this slot now that we intend to use it.
*/
memset(&HostP->Mapping[unit], 0, sizeof(struct Map));
/*
** If the second ID is not needed then we can return
** now.
*/
if (pID2 == NULL)
return 0;
} else {
/*
** Allocate the second slot and return.
*/
rio_dprintk(RIO_DEBUG_ROUTE, "Grab tentative/empty entry for second unit %d\n", unit);
*pID2 = unit;
/*
** Clear out this slot now that we intend to use it.
*/
memset(&HostP->Mapping[unit], 0, sizeof(struct Map));
/* At this point under the right(wrong?) conditions
** we may have a first unit ID being higher than the
** second unit ID. This is a bad idea if we are about
** to fill the slots with a 16 port RTA.
** Better check and swap them over.
*/
if (*pID1 > *pID2) {
rio_dprintk(RIO_DEBUG_ROUTE, "Swapping IDS %d %d\n", *pID1, *pID2);
tempID = *pID1;
*pID1 = *pID2;
*pID2 = tempID;
}
return 0;
}
}
}
/*
** If we manage to get to the end of the second loop then we
** can give up and return a failure.
*/
return 1;
}
/*
** The link switch scenario.
**
** Rta Wun (A) is connected to Tuw (A).
** The tables are all up to date, and the system is OK.
**
** If Wun (A) is now moved to Wun (B) before Wun (A) can
** become disconnected, then the follow happens:
**
** Tuw (A) spots the change of unit:link at the other end
** of its link and Tuw sends a topology packet reflecting
** the change: Tuw (A) now disconnected from Wun (A), and
** this is closely followed by a packet indicating that
** Tuw (A) is now connected to Wun (B).
**
** Wun (B) will spot that it has now become connected, and
** Wun will send a topology packet, which indicates that
** both Wun (A) and Wun (B) is connected to Tuw (A).
**
** Eventually Wun (A) realises that it is now disconnected
** and Wun will send out a topology packet indicating that
** Wun (A) is now disconnected.
*/
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