Hi,
I am trying to implement a platform driver for msi. Whenever I write
in to the PCIE-IH space, the kernel stops abruptly and the system is
reset.
Below is the part of the code which lead me to the brick wall!
I am getting the PCIEIH base addr from dts .
if (of_address_to_resource(dn, 0,&pcieih_reg)) {
printk(KERN_ERR "%s: Can't get PCIEIH Resource !",
dn->full_name);
return -1;
}
pcieih_base = ioremap(pcieih_reg.start, pcieih_reg.end + 1 -
pcieih_reg.start);
out_be32(pcieih_base + PEIH_TERMADL, PPC4XX_PCIE_MSI_LADDR)
Whenever I try to access the registers in PCIE-IH space the
device gets restarted.
I have one more clarification to be made. The datasheet says that the
PCIE-IH registers are implemented at EF62 0000. But the SDR registers
- PESDRn_PEIHS1 and PESDRn_PEIHS2 reset value is c00100000.
When I read the SDR registers I am getting only 000000 instead of the
specified reset value.
sdrbase = of_get_property(dn, "sdr-base", NULL);
if (sdrbase == NULL) {
printk(KERN_ERR "PCIEIH-msi: missing sdr-base for %s\n",
dn->full_name);
return -1;
}
sdr_base = *sdrbase;
printk("SDR_BASE :%08x \n", sdr_base);
mtdcri(SDR0,sdr_base + PESDRn_PEIHS1, baseaddrhi);
mtdcri(SDR0,sdr_base + PESDRn_PEIHS2, baseaddrlow);
I have tried both with ef62 0000 and c00100000 but both didnt help.
Expecting your guidance to proceed further!
--
With Regards,
Deepak Pandian
"Time is precious,One day we will find that we have less than what we
think" -RandyPausch
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