Interesting tidbit: NetMos 9835 card, IRQ, and ACPI

From: Michael Tokarev
Date: Thu Mar 24 2005 - 14:04:14 EST

Found an interesting issue here.

HP ProLiant ML150 box (dual xeon 2.4GHz) with intel
chipset (lspci output below) and NetMos PCI 9835
Multi-I/O Controller.

Boot with no fancy options on kernel command line.

# cat /sys/bus/pci/devices/0000:01:00.0/irq
11
# modprobe 8250
# setserial /dev/ttyS2 irq 11 port 0xa400 autoconfig

the serial port does not work: close'int the file
after writing something stalls for a while, and nothing
gets written. Ok.

# rmmod 8250
# modprobe parport_pc
ACPI: PCI interrupt 0000:01:00.0[A] -> GSI 18 (level, low) -> IRQ 193
# cat /sys/bus/pci/devices/0000:01:00.0/irq
193
# rmmod parport_pc # as it will conflict with 8250 here
# modprobe 8250
# setserial /dev/ttyS2 irq 193 port 0xa400 autoconfig

now the serial port works.

In other words, one have to load and unload parport_pc to
trigger that IRQ change, after which serial driver works.

When booting with pci=noacpi, the irq here is always 169,
and everything works fine (modulo the parport_pc vs 8250
conflict which is a different story).

Without that parport_pc "ping" hack, the whole stuff looks
like a BIOS problem. But parport_pc behaviour makes it..
more interesting... ;)

Kernel is 2.6.11.

BTW, we have another prob with this very Netmos card and this very
machine: sometimes, the whole machine hangs hard when using serial
driver, so only power button helps. Happens with 2.4.* kernels
(it assigns IRQ18 to the card) and with earlier 2.6.x kernels.
Dunno if the two are related.

/mjt

# lspci
0000:00:00.0 Host bridge: Intel Corp. E7501 Memory Controller Hub (rev 01)
0000:00:02.0 PCI bridge: Intel Corp. E7500/E7501 Hub Interface B PCI-to-PCI Bridge (rev 01)
0000:00:1d.0 USB Controller: Intel Corp. 82801CA/CAM USB (Hub #1) (rev 02)
0000:00:1e.0 PCI bridge: Intel Corp. 82801 PCI Bridge (rev 42)
0000:00:1f.0 ISA bridge: Intel Corp. 82801CA LPC Interface Controller (rev 02)
0000:00:1f.1 IDE interface: Intel Corp. 82801CA Ultra ATA Storage Controller (rev 02)
0000:00:1f.3 SMBus: Intel Corp. 82801CA/CAM SMBus Controller (rev 02)
0000:01:00.0 Serial controller: NetMos Technology PCI 9835 Multi-I/O Controller (rev 01)
0000:01:02.0 VGA compatible controller: ATI Technologies Inc Rage XL (rev 27)
0000:02:1c.0 PIC: Intel Corp. 82870P2 P64H2 I/OxAPIC (rev 04)
0000:02:1d.0 PCI bridge: Intel Corp. 82870P2 P64H2 Hub PCI Bridge (rev 04)
0000:02:1e.0 PIC: Intel Corp. 82870P2 P64H2 I/OxAPIC (rev 04)
0000:02:1f.0 PCI bridge: Intel Corp. 82870P2 P64H2 Hub PCI Bridge (rev 04)
0000:04:01.0 Ethernet controller: Intel Corp. 82545EM Gigabit Ethernet Controller (Copper) (rev 01)
0000:04:04.0 SCSI storage controller: Adaptec AIC-7902 U320 (rev 03)
0000:04:04.1 SCSI storage controller: Adaptec AIC-7902 U320 (rev 03)

# lspci -vv
0000:00:00.0 Host bridge: Intel Corp. E7501 Memory Controller Hub (rev 01)
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B-
Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0
Capabilities: [40] #09 [1105]

0000:00:02.0 PCI bridge: Intel Corp. E7500/E7501 Hub Interface B PCI-to-PCI Bridge (rev 01) (prog-if 00 [Normal decode])
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B-
Status: Cap- 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 64
Bus: primary=00, secondary=02, subordinate=04, sec-latency=0
I/O behind bridge: 0000b000-0000dfff
Memory behind bridge: fe600000-feafffff
Prefetchable memory behind bridge: ff700000-ff9fffff
BridgeCtl: Parity- SERR+ NoISA+ VGA- MAbort- >Reset- FastB2B-

0000:00:1d.0 USB Controller: Intel Corp. 82801CA/CAM USB (Hub #1) (rev 02) (prog-if 00 [UHCI])
Subsystem: Hewlett-Packard Company: Unknown device 2480
Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0
Interrupt: pin A routed to IRQ 153
Region 4: I/O ports at e800 [size=32]

0000:00:1e.0 PCI bridge: Intel Corp. 82801 PCI Bridge (rev 42) (prog-if 00 [Normal decode])
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B-
Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0
Bus: primary=00, secondary=01, subordinate=01, sec-latency=32
I/O behind bridge: 00007000-0000afff
Memory behind bridge: fc500000-fe5fffff
Prefetchable memory behind bridge: ff600000-ff6fffff
BridgeCtl: Parity- SERR+ NoISA- VGA+ MAbort- >Reset- FastB2B-

0000:00:1f.0 ISA bridge: Intel Corp. 82801CA LPC Interface Controller (rev 02)
Control: I/O+ Mem+ BusMaster+ SpecCycle+ MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0

0000:00:1f.1 IDE interface: Intel Corp. 82801CA Ultra ATA Storage Controller (rev 02) (prog-if 8a [Master SecP PriP])
Subsystem: Hewlett-Packard Company: Unknown device 2480
Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0
Interrupt: pin A routed to IRQ 169
Region 0: I/O ports at <unassigned>
Region 1: I/O ports at <unassigned>
Region 2: I/O ports at <unassigned>
Region 3: I/O ports at <unassigned>
Region 4: I/O ports at ffa0 [size=16]
Region 5: Memory at 80000000 (32-bit, non-prefetchable) [disabled] [size=1K]

0000:00:1f.3 SMBus: Intel Corp. 82801CA/CAM SMBus Controller (rev 02)
Subsystem: Hewlett-Packard Company: Unknown device 2480
Control: I/O+ Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Interrupt: pin B routed to IRQ 161
Region 4: I/O ports at 0540 [size=32]

0000:01:00.0 Serial controller: NetMos Technology PCI 9835 Multi-I/O Controller (rev 01) (prog-if 02 [16550])
Subsystem: LSI Logic / Symbios Logic 2S (16C550 UART)
Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B-
Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Interrupt: pin A routed to IRQ 169
Region 0: I/O ports at a400 [size=8]
Region 1: I/O ports at a000 [size=8]
Region 2: I/O ports at 9800 [size=8]
Region 3: I/O ports at 9400 [size=8]
Region 4: I/O ports at 9000 [size=8]
Region 5: I/O ports at 8800 [size=16]

0000:01:02.0 VGA compatible controller: ATI Technologies Inc Rage XL (rev 27) (prog-if 00 [VGA])
Subsystem: Hewlett-Packard Company: Unknown device 8008
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping+ SERR- FastB2B-
Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 64 (2000ns min), Cache Line Size: 0x10 (64 bytes)
Interrupt: pin A routed to IRQ 169
Region 0: Memory at fd000000 (32-bit, non-prefetchable) [size=16M]
Region 1: I/O ports at a800 [size=256]
Region 2: Memory at fe5ff000 (32-bit, non-prefetchable) [size=4K]
Expansion ROM at fe5c0000 [disabled] [size=128K]
Capabilities: [5c] Power Management version 2
Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-

0000:02:1c.0 PIC: Intel Corp. 82870P2 P64H2 I/OxAPIC (rev 04) (prog-if 20 [IO(X)-APIC])
Subsystem: Intel Corp. 82870P2 P64H2 I/OxAPIC
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B-
Status: Cap+ 66MHz+ UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0
Region 0: Memory at feafe000 (32-bit, non-prefetchable) [size=4K]
Capabilities: [50] PCI-X non-bridge device.
Command: DPERE- ERO- RBC=0 OST=0
Status: Bus=2 Dev=28 Func=0 64bit+ 133MHz+ SCD- USC-, DC=simple, DMMRBC=0, DMOST=0, DMCRS=0, RSCEM-

0000:02:1d.0 PCI bridge: Intel Corp. 82870P2 P64H2 Hub PCI Bridge (rev 04) (prog-if 00 [Normal decode])
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B-
Status: Cap+ 66MHz+ UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 64, Cache Line Size: 0x10 (64 bytes)
Bus: primary=02, secondary=04, subordinate=04, sec-latency=64
I/O behind bridge: 0000b000-0000dfff
Memory behind bridge: fe700000-fe9fffff
Prefetchable memory behind bridge: 00000000ff800000-00000000ff800000
BridgeCtl: Parity- SERR+ NoISA+ VGA- MAbort- >Reset- FastB2B-
Capabilities: [50] PCI-X bridge device.
Secondary Status: 64bit+, 133MHz+, SCD-, USC-, SCO-, SRD- Freq=1
Status: Bus=2 Dev=29 Func=0 64bit+ 133MHz+ SCD- USC-, SCO-, SRD-
: Upstream: Capacity=65535, Commitment Limit=65535
: Downstream: Capacity=65535, Commitment Limit=65535

0000:02:1e.0 PIC: Intel Corp. 82870P2 P64H2 I/OxAPIC (rev 04) (prog-if 20 [IO(X)-APIC])
Subsystem: Intel Corp. 82870P2 P64H2 I/OxAPIC
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B-
Status: Cap+ 66MHz+ UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0
Region 0: Memory at feaff000 (32-bit, non-prefetchable) [size=4K]
Capabilities: [50] PCI-X non-bridge device.
Command: DPERE- ERO- RBC=0 OST=0
Status: Bus=2 Dev=30 Func=0 64bit+ 133MHz+ SCD- USC-, DC=simple, DMMRBC=0, DMOST=0, DMCRS=0, RSCEM-

0000:02:1f.0 PCI bridge: Intel Corp. 82870P2 P64H2 Hub PCI Bridge (rev 04) (prog-if 00 [Normal decode])
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B-
Status: Cap+ 66MHz+ UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 64, Cache Line Size: 0x10 (64 bytes)
Bus: primary=02, secondary=03, subordinate=03, sec-latency=64
Memory behind bridge: fe600000-fe6fffff
Prefetchable memory behind bridge: 00000000ff700000-00000000ff700000
BridgeCtl: Parity- SERR+ NoISA+ VGA- MAbort- >Reset- FastB2B-
Capabilities: [50] PCI-X bridge device.
Secondary Status: 64bit+, 133MHz+, SCD-, USC-, SCO-, SRD- Freq=3
Status: Bus=2 Dev=31 Func=0 64bit+ 133MHz+ SCD- USC-, SCO-, SRD-
: Upstream: Capacity=65535, Commitment Limit=65535
: Downstream: Capacity=65535, Commitment Limit=65535

0000:04:01.0 Ethernet controller: Intel Corp. 82545EM Gigabit Ethernet Controller (Copper) (rev 01)
Subsystem: Hewlett-Packard Company: Unknown device 1001
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop- ParErr- Stepping- SERR+ FastB2B-
Status: Cap+ 66MHz+ UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 64 (63750ns min), Cache Line Size: 0x10 (64 bytes)
Interrupt: pin A routed to IRQ 177
Region 0: Memory at fe9a0000 (64-bit, non-prefetchable) [size=128K]
Region 4: I/O ports at c400 [size=64]
Capabilities: [dc] Power Management version 2
Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
Status: D0 PME-Enable- DSel=0 DScale=1 PME-
Capabilities: [e4] PCI-X non-bridge device.
Command: DPERE- ERO+ RBC=0 OST=0
Status: Bus=4 Dev=1 Func=0 64bit+ 133MHz+ SCD- USC-, DC=simple, DMMRBC=2, DMOST=0, DMCRS=1, RSCEM-
Capabilities: [f0] Message Signalled Interrupts: 64bit+ Queue=0/0 Enable-
Address: 0000000000000000 Data: 0000

0000:04:04.0 SCSI storage controller: Adaptec AIC-7902 U320 (rev 03)
Subsystem: Hewlett-Packard Company: Unknown device 103c
Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV+ VGASnoop- ParErr- Stepping- SERR+ FastB2B-
Status: Cap+ 66MHz+ UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 64 (10000ns min, 6250ns max), Cache Line Size: 0x10 (64 bytes)
Interrupt: pin A routed to IRQ 185
Region 0: I/O ports at d000 [size=256]
Region 1: Memory at fe9fc000 (64-bit, non-prefetchable) [disabled] [size=8K]
Region 3: I/O ports at c800 [size=256]
Expansion ROM at fe880000 [disabled] [size=512K]
Capabilities: [dc] Power Management version 2
Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-
Capabilities: [a0] Message Signalled Interrupts: 64bit+ Queue=0/1 Enable-
Address: 0000000000000000 Data: 0000
Capabilities: [94]
0000:04:04.1 SCSI storage controller: Adaptec AIC-7902 U320 (rev 03)
Subsystem: Hewlett-Packard Company: Unknown device 103c
Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV+ VGASnoop- ParErr- Stepping- SERR+ FastB2B-
Status: Cap+ 66MHz+ UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 64 (10000ns min, 6250ns max), Cache Line Size: 0x10 (64 bytes)
Interrupt: pin B routed to IRQ 193
Region 0: I/O ports at d800 [size=256]
Region 1: Memory at fe9fe000 (64-bit, non-prefetchable) [disabled] [size=8K]
Region 3: I/O ports at d400 [size=256]
Expansion ROM at fe900000 [disabled] [size=512K]
Capabilities: [dc] Power Management version 2
Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-
Capabilities: [a0] Message Signalled Interrupts: 64bit+ Queue=0/1 Enable-
Address: 0000000000000000 Data: 0000
Capabilities: [94]
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