Mahajan Vivek-B08308 wrote:

quoted

From: Felix Radensky [mailto:felix@embedded-sol.com] 
Sent: Wednesday, December 16, 2009 2:56 PM
To: Mahajan Vivek-B08308
Cc: linuxppc-dev@ozlabs.org; Aggrwal Poonam-B10812; Kumar Gala
Subject: Re: Problem with mini-PCI-E slot on P2020RDB

Hi,
    

quoted

Looks like INTA is not being routed to IRQ0 properly for this PCIe 
ctlr. Try changing the interrupt-map prop for the ctlr at 
      

0xffe0a000 
    

quoted

to the following, temporarily:-

interrupt-map = <
/* IDSEL 0x0 */
0000 0x0 0x0 0x1 &mpic 0x1 0x1
0000 0x0 0x0 0x2 &mpic 0x2 0x1
0000 0x0 0x0 0x3 &mpic 0x3 0x1
0000 0x0 0x0 0x4 &mpic 0x0 0x1
  
      

Thanks for your help. With this change "nobody cared" message 
disappears, but interrupts are not coming at all.

Is it a SoC problem or a board problem ?
    

As per the p2020rm, PCIe legacy INTA is shared with IRQ0 for 
this ctlr, which is the exactly the case with other SoC's 
p2020ds, mpc8536ds, mpc8572ds. To me it seems like a board 
issue and it needs to be followed up.

I plugged in ralink rt2860 pcie wirless card in the mini-pcie 
slot of p2020rdb, which ran fine becaused it used MSI by default.
How hard is it to enable MSI in the atheros wireless driver.

  

I've enabled MSI in ath9k driver, by simply adding pci_enable_msi() and
pci_disable_msi() at relevant places. The MSI interrupt is allocated.

irq: irq 0 on host /soc@ffe00000/msi@41600 mapped to virtual irq 18
phy0: Atheros AR9280 MAC/BB Rev:2 AR5133 RF Rev:d0: mem=0xf2160000, irq=18

cat /proc/interrupts
           CPU0
 18:          0   FSL-MSI   Edge      ath9k

lspci -v shows that MSI was enabled on device

But I don't get any interrupts. I've posted a question to ath9k list, 
maybe folks there
will have some ideas.

Thanks.

Felix.