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Altera_Forum
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10 years ago

MSI Interrupt not working

Hi, I wrote a PCIe device driver. The driver is installed successfully. Interrupt is set to MSI. After installation, Power Enters D0 state. Interrupt enabled (MSI, MSEnable bit =1). Legacy Interru...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
10 years ago

To enable MSI interrupts, ensure to enable the CRA port.

Software driver at host PC also needs to set the MSI enable bit and Interrupt Disable bit.

1. Set MSI Enable of MSI Control register, this bit is mapped to bit[16] of offset 0x50 in configuration space register.

2. Set Interrupt Disable bit[10] of Command register at configuration space offset register 0x4 to disable legacy interrupt.

3. Set bit[1] (Memory space) and bit[2] (Bus Master) of Command Register at configuration space offset register 0x4 to enable the ability to

generate MSI message.