Where do I access inbound MSI interrupts to the T1040 processor?

[andrewostler]

The target address for the MSI window is CCSR, but i'm assuming it doesn't write over the config registers at 0xFE000000.  Where does this MSI data get written?

[ufedor]

The MSI data has to be written to the MSIIR register in the PIC.

Please refer to the QorIQ T1040 Reference Manual, 28.12.2.2.2 MSI handling.

[andrewostler]

It looks like this writes a single bit inside of the register you choose to forward it to. Is this correct or does the MSI contain data that can be read somewhere?

[ufedor]

MSI is an interrupt which is signalled by setting specified bit in a specified register - see description of the MSIIRA(B,C) in the QorIQ T1040 Reference Manual.

[andrewostler]

Thank you for your help.  It seems that I'm unable to write to the msi message control register in order to enable MSIs in my 1040 which is set up at the Root.  Any idea why this would be the case?  I am also reading 0s in the MSI message capability id register which it says is supposed to be 0x05.

[ufedor]

Please explain how did you read the registers and provide corresponding logs if you've used U-Boot to do that.

[andrewostler]

I am reading this register by writing to the PEX_CONFIG_ADDR register:   0x80000088.  Then i read the PCIE_CONFIG_DATA register.

[ufedor]

> PEX_CONFIG_ADDR register

> PCIE_CONFIG_DATA register

What are addresses of the registers?

Which RCW you're using?

[andrewostler]

sorry I mistyped that second register, it is the PEX_CONFIG_DATA register.   The ADDR register is: 0xFE250000      DATA is:  0xFE250004.  The offsest of 0x250000 is because we are using the PEX2 controller.  I'm not sure what the RCW is that you are referring to, it you could please explain.

[ufedor]

> I'm not sure what the RCW is that you are referring to, it you could please explain.

Please refer to the QorIQ T1040 Reference Manual, 4.6.5 Reset configuration word (RCW)

[andrewostler]

The RCW status register reads:

0x00:     0x0810000C     0x08000000     0x00000000     0x00000000

0x08:     0x66000002     0x80008002     0x5C027000     0x21002400

0x10:     0x00000000     0x00000000     0x00000000     0x00030810

0x18:     0x00000000     0x8156500F     0x00000000     0x00000000

Is this what you are looking for?

[ufedor]

What is the SD1_REF_CLK1 frequency?

[andrewostler]

I'm not sure where i would find this.

Edit:  in the RCW data it looks like this is set to 125 MHz.

[ufedor]

Which board is used?

[andrewostler]

T1040

[ufedor]

Does your answer mean that the board is a proprietary one?

[andrewostler]

I'm not sure what further detail you are asking about the board.  The T1040 RDB board has it's specs on the NXP website.  Sorry if I'm not understanding your question.

[ufedor]

Excuse me, but your response was "T1040" only - how could I guess that you've meant T1040RDB?

You wrote:

> The ADDR register is: 0xFE250000

Please try 0xFFE250000

[andrewostler]

I apologize for not being specific, i didn't realize there were different versions of that board.

The problem is not with accessing the config registers.  I'm able to access other config registers at 0xFE250000, but this specific one is inaccessible.

[ufedor]

> I am reading this register by writing to the PEX_CONFIG_ADDR register:   0x80000088.

Please note that in the provided RCW the HOST_AGT_PEX field is 000 (All PEXn in RC mode).

Also please refer to the QorIQ T1040 Reference Manual, 28.10 PCI compatible device-specific configuration space, Figure 28-5. PCI Compatible Device-Specific Configuration Space, byte 0x4D "Next Pointer (EP: 0x88/RC: NULL)" - this means that MSI capabilities are specified only for EPs.

[andrewostler]

ok, that's what I needed to know.  I guess I'm just not sure what other things i need to configure on the RC side.  I am setting the IWBAR  and IWBEAR to the same address which our device is sending it's MSIs to.  I also set the PEXMSIIWAR to 0x80E00000.  Is there any additional configuration necessary?