Bjorn,
Keystone PCI h/w doesn't support IO access in the inbound direction
as stated in the hardware spec cut-n-pasted below.
• No support for IO access in inbound direction in RC or EP mode
Way back when the driver was ported, I vaguely recollect I had to
add a dummy IO range to satisfy PCI Driver core. I am assuming the
first entry in the DTS is for this IO port access. Is it true?
arch/arm/boot/dts/k2e.dtsi
ranges = <0x81000000 0 0 0x23260000 0x4000 0x4000
0x82000000 0 0x60000000 0x60000000 0 0x10000000>;
I see following boot log when I boot with 4.4.x kernel
>> keystone-pcie 21021000.pcie: error -22: failed to map resource [io 0x0000-0x400000003fff]
I need to fix the above entry to
- ranges = <0x81000000 0 0 0x23260000 0x4000 0x4000
+ ranges = <0x81000000 0 0 0x23260000 0x0 0x4000
0x82000000 0 0x60000000 0x60000000 0 0x10000000>;
to remove this error message.
However I am wondering if it is mandatory to define this range at all. I tried
to remove the entry and I get following error then
[ 0.448772] pci 0000:00:00.0: BAR 8: assigned [mem 0x60000000-0x600fffff]
[ 0.448783] pci 0000:00:00.0: BAR 9: assigned [mem 0x60100000-0x601fffff pref]
[ 0.448792] pci 0000:00:00.0: BAR 7: no space for [io size 0x1000]
[ 0.448800] pci 0000:00:00.0: BAR 7: failed to assign [io size 0x1000]
[ 0.448813] pci 0000:01:00.0: BAR 6: assigned [mem 0x60100000-0x6010ffff pref]
[ 0.448822] pci 0000:01:00.0: BAR 5: assigned [mem 0x60000000-0x600001ff]
[ 0.448834] pci 0000:01:00.0: BAR 4: no space for [io size 0x0010]
[ 0.448841] pci 0000:01:00.0: BAR 4: failed to assign [io size 0x0010]
[ 0.448848] pci 0000:01:00.0: BAR 0: no space for [io size 0x0008]
[ 0.448855] pci 0000:01:00.0: BAR 0: failed to assign [io size 0x0008]
[ 0.448863] pci 0000:01:00.0: BAR 2: no space for [io size 0x0008]
[ 0.448870] pci 0000:01:00.0: BAR 2: failed to assign [io size 0x0008]
[ 0.448877] pci 0000:01:00.0: BAR 1: no space for [io size 0x0004]
[ 0.448884] pci 0000:01:00.0: BAR 1: failed to assign [io size 0x0004]
[ 0.448891] pci 0000:01:00.0: BAR 3: no space for [io size 0x0004]
[ 0.448898] pci 0000:01:00.0: BAR 3: failed to assign [io size 0x0004]
[ 0.448907] pci 0000:00:00.0: PCI bridge to [bus 01]
The original log is below and even with the error, I am able to have SATA
drive function as expected over this PCIe interface.
[ 0.420648] PCI host bridge /soc/pcie@21020000 ranges:
[ 0.420659] No bus range found for /soc/pcie@21020000, using [bus 00-ff]
[ 0.420679] IO 0x23260000..0x400023263fff -> 0x00000000
[ 0.420685] Requested IO range too big, new size set to 64K
[ 0.420702] MEM 0x60000000..0x6fffffff -> 0x60000000
[ 0.420713] keystone-pcie 21021000.pcie: error -22: failed to map resource [io 0x0000-0x400000003fff]
[ 0.431849] keystone-pcie 21021000.pcie: PCI host bridge to bus 0000:00
[ 0.431861] pci_bus 0000:00: root bus resource [bus 00-ff]
[ 0.431870] pci_bus 0000:00: root bus resource [io 0x0000-0x400000003fff]
[ 0.431879] pci_bus 0000:00: root bus resource [mem 0x60000000-0x6fffffff]
[ 0.431906] pci 0000:00:00.0: [104c:b009] type 01 class 0x060400
[ 0.432173] PCI: bus0: Fast back to back transfers disabled
[ 0.432334] pci 0000:01:00.0: [1b4b:9182] type 00 class 0x010601
[ 0.432382] pci 0000:01:00.0: reg 0x10: [io 0x8000-0x8007]
[ 0.432402] pci 0000:01:00.0: reg 0x14: [io 0x8040-0x8043]
[ 0.432420] pci 0000:01:00.0: reg 0x18: [io 0x8100-0x8107]
[ 0.432439] pci 0000:01:00.0: reg 0x1c: [io 0x8140-0x8143]
[ 0.432457] pci 0000:01:00.0: reg 0x20: [io 0x800000-0x80000f]
[ 0.432476] pci 0000:01:00.0: reg 0x24: [mem 0x00900000-0x009001ff]
[ 0.432495] pci 0000:01:00.0: reg 0x30: [mem 0xd0000000-0xd000ffff pref]
[ 0.432561] pci 0000:01:00.0: PME# supported from D3hot
[ 0.448635] PCI: bus1: Fast back to back transfers disabled
[ 0.448717] pci 0000:00:00.0: BAR 8: assigned [mem 0x60000000-0x600fffff]
[ 0.448729] pci 0000:00:00.0: BAR 9: assigned [mem 0x60100000-0x601fffff pref]
[ 0.448738] pci 0000:00:00.0: BAR 7: assigned [io 0x1000-0x1fff]
[ 0.448751] pci 0000:01:00.0: BAR 6: assigned [mem 0x60100000-0x6010ffff pref]
[ 0.448760] pci 0000:01:00.0: BAR 5: assigned [mem 0x60000000-0x600001ff]
[ 0.448772] pci 0000:01:00.0: BAR 4: assigned [io 0x1000-0x100f]
[ 0.448784] pci 0000:01:00.0: BAR 0: assigned [io 0x1010-0x1017]
[ 0.448796] pci 0000:01:00.0: BAR 2: assigned [io 0x1018-0x101f]
[ 0.448808] pci 0000:01:00.0: BAR 1: assigned [io 0x1020-0x1023]
[ 0.448820] pci 0000:01:00.0: BAR 3: assigned [io 0x1024-0x1027]
[ 0.448833] pci 0000:00:00.0: PCI bridge to [bus 01]
[ 0.448842] pci 0000:00:00.0: bridge window [io 0x1000-0x1fff]
[ 0.448851] pci 0000:00:00.0: bridge window [mem 0x60000000-0x600fffff]
[ 0.448860] pci 0000:00:00.0: bridge window [mem 0x60100000-0x601fffff pref]
[ 0.449077] pcieport 0000:00:00.0: Signaling PME through PCIe PME interrupt
[ 0.449086] pci 0000:01:00.0: Signaling PME through PCIe PME interrupt
[ 0.449095] pcie_pme 0000:00:00.0:pcie01: service driver pcie_pme loaded
[ 0.449240] aer 0000:00:00.0:pcie02: service driver aer loaded
Thanks and regards,
--
Murali Karicheri
Linux Kernel, Keystone
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