I've got a design that is 405EXr based so its got 32 bit
address space. We have an FPGA that sits on our pcie bus
and we want it to have 2 BARs with 1G of space and maybe
256MB of space. I cannot figure out what I need to change
in the kernel/dts to make this work.
Right now, if I go over 512MB in the DTS "ranges" parameter
then I'll get an error during kernel boot.
My thought is that the magic happens in the function:
ppc4xx_pciex_port_init_mapping(...)
In there I see it setting up the REGBAH and REGBAL and then
this curious statement:
/* XXX FIXME: Use size from reg property. For now, map * 512M */
dcr_write(port->dcrs, DCRO_PEGPL_CFGMSK, 0xe0000001);
I figure I need to change that or fix it the right way
(though I don't know how to do that). The other thing is my
dts file. It is based on the amcc kilauea and here is the
part that I am unsure of. The PCIe entry falls under the
PLB which could also be a problem but again, I am not sure.
So basically, is there an easy way to change what I've got
to map 1.25 or 2GB of space?
Thanks
Ayman
PCIE0: pciex@0a0000000 {
device_type = "pci";
#interrupt-cells = <1>;
#size-cells = <2>;
#address-cells = <3>;
compatible = "ibm,plb-pciex-405ex", "ibm,plb-pciex";
primary;
port = <0x0>; /* port number */
reg = <0xa0000000 0x20000000 /* Config space access */
0xef000000 0x00001000>; /* Registers */
dcr-reg = <0x040 0x020>;
sdr-base = <0x400>;
/* Outbound ranges, one memory and * one IO,
* later cannot be changed
*/
ranges = <0x02000000 0x00000000 0x80000000 0x90000000
0x00000000 0x08000000
0x01000000 0x00000000 0x00000000 0xe0000000
0x00000000 0x00010000>;
/* Inbound 2GB range starting at 0 * */
dma-ranges = <0x42000000 0x0 0x0 0x0 0x0 0x80000000>;
/* This drives busses 0x00 to 0x3f * */
bus-range = <0x0 0x3f>;
/* Legacy interrupts (note the weird * polarity, the bridge
seems
* to invert PCIe legacy
* interrupts).
* We are de-swizzling here because
* the numbers are actually for
* port of the root complex virtual
* P2P bridge. But I want
* to avoid putting a node for it in
* the tree, so the numbers
* below are basically de-swizzled
* numbers.
* The real slot is on idsel 0, so
* the swizzling is 1:1
*/
interrupt-map-mask = <0x0 0x0 0x0 0x7>;
interrupt-map = < 0x0 0x0 0x0 0x1 &UIC2 0x0 0x4 /* swizzled int
A */
0x0 0x0 0x0 0x2 &UIC2 0x1 0x4
/* swizzled int B */
0x0 0x0 0x0 0x3 &UIC2 0x2 0x4
/* swizzled int C */
0x0 0x0 0x0 0x4 &UIC2 0x3 0x4
/* swizzled int D */>;
};
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