hello
I have some sunpci card and I want to made a driver for it.
It is a card which includes an x86 processor, RAM, expansion ports, and an onboard graphics controller, allowing complete x86 operating environments on Sun Workstations.
My first goal is to be able to see all devices present on this card and use it under Linux.
My second goal is to use it like we can use it under Solaris.
When plugged, I can see it with prtconf
Node 0xf0092a38
.node: f0092a38
interrupt-map:
00010000.00000000.00000000.00000001.f0064548.00000019.00010000.00000000.00000000.00000002.f0064548.00000002.00010000.00000000.00000000.00000003.f0064548.00000018.00010000.00000000.00000000.00000004.f0064548.00000008.00010800.00000000.00000000.00000001.f0064548.0000000a.00010800.00000000.00000000.00000002.f0064548.0000001b.00010800.00000000.00000000.00000003.f0064548.0000000b.00010800.00000000.00000000.00000004.f0064548.0000001a.00011000.00000000.00000000.00000001.f0064548.00000015.00011000.00000000.00000000.00000002.f0064548.00000005.00011000.00000000.00000000.00000003.f0064548.00000014.00011000.00000000.00000000.00000004.f0064548.00000004
interrupt-map-mask: 00fff800.00000000.00000000.00000007
ranges:
bus-range: 00000001.00000001
compatible: 70636931.3031312c.32342e33.00706369.31303131.2c323400.70636963.6c617373.2c303630.34303000.70636963.6c617373.2c303630.3400
reg: 00002800.00000000.00000000.00000000.00000000
#address-cells: 00000003
#size-cells: 00000002
device_type: 'pci'
name: 'pci'
fast-back-to-back:
devsel-speed: 00000001
class-code: 00060400
latency-timer: 00000040
cache-line-size: 00000010
revision-id: 00000003
device-id: 00000024
vendor-id: 00001011
and lspci
00:05.0 PCI bridge: Digital Equipment Corporation DECchip 21152 (rev 03) (prog-if 00 [Normal decode])
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 64, Cache Line Size: 64 bytes
Region 0: [virtual] Memory at fffffe0100000000 (32-bit, non-prefetchable) [size=1]
Region 1: [virtual] Memory at fffffe0100000000 (32-bit, non-prefetchable) [size=1]
Bus: primary=00, secondary=01, subordinate=01, sec-latency=0
I/O behind bridge: 00001000-00000fff
Memory behind bridge: 04000000-03ffffff
Prefetchable memory behind bridge: fffffffffff00000-00000000000fffff
Secondary status: 66MHz- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort+ <SERR- <PERR-
[virtual] Expansion ROM at fffffe0100000000 [disabled] [size=1]
BridgeCtl: Parity- SERR- NoISA- VGA- MAbort- >Reset- FastB2B-
PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
Capabilities: [dc] Power Management version 1
Flags: PMEClk- DSI- D1- D2- AuxCurrent=220mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
Bridge: PM- B3+
You can see that ranges for I/O, memory and prefetchable memory are unusable.
I think this is because the value "ranges" in OF(open-firmware) is NULL.
And so of_scan_pci_bridge() use pci_cfg_fake_ranges() for getting limits values directly from the sunpci card.
But theses values are 0.
So I have some questions
- Does setting manually IO/mem limits in the card (via a pci_write_config_word(dev, PCI_MEMORY_LIMIT, somevalue); for example) works ? and which values to set ? (base + 0xfff/0xfffff ?)
- How can OpenFirmware could be aware of the IO/memory ranges of the sunpci cards ? perhaps via an OBP command at start ?
Thanks in advance
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