MIPS: Cobalt: Include legacy IDE ports in the PCI I/O window

The Cobalt PCI I/O window starts at 0x1000, excluding the VIA IDE
controller's fixed compatibility-mode ports at 0x170, 0x1f0, 0x376 and
0x3f6. Since pcibios_enable_device() was converted to
pci_enable_resources(), these unclaimed resources cause pata_via to
fail to probe with -EINVAL.

Start the PCI I/O window at zero to cover the southbridge legacy ports,
retaining 0x1000 as the allocation minimum via PCIBIOS_MIN_IO. Register
the PCI controller from plat_mem_setup(), before the VIA reservations
and i8259 initialization, so the legacy resources do not conflict with
the host bridge window and prevent PCI bus scanning.

Keep the VIA resource reservations in plat_mem_setup() after the PCI
controller registration and use insert_resource() to nest them beneath
the PCI window. The i8259 and RTC resources are also claimed beneath it.

Boot-tested on a Qube2 with a MIPS64 kernel. All seven PCI functions
enumerate, both tulip devices bind, and pata_via initializes both ATA
hosts and detects the ST380012A 80 GB disk. All 18 boot checks pass,
including a read-only disk test and Ethernet ping.

Fixes: ae81aad5c2e1 ("MIPS: PCI: Use pci_enable_resources()")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Maciej W. Rozycki <macro@orcam.me.uk>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

0 files changed, 0 insertions, 0 deletions