forked from Minki/linux
00406e8772
The following commit prevents the MPC8548E on the XPedite5200 PrPMC
module from enumerating its PCI/PCI-X bus:
powerpc/fsl-pci: use 'Header Type' to identify PCIE mode
The previous patch prevents any Freescale PCI-X bridge from enumerating
the bus, if it is hardware strapped into Agent mode.
In PCI-X, the Host is responsible for driving the PCI-X initialization
pattern to devices on the bus, so that they know whether to operate in
conventional PCI or PCI-X mode as well as what the bus timing will be.
For a PCI-X PrPMC, the pattern is driven by the mezzanine carrier it is
installed onto. Therefore, PrPMCs are PCI-X Agents, but one per system
may still enumerate the bus.
This patch causes the device node of any PCI/PCI-X bridge strapped into
Agent mode to be checked for the fsl,pci-agent-force-enum property. If
the property is present in the node, the bridge will be allowed to
enumerate the bus.
Cc: Minghuan Lian <Minghuan.Lian@freescale.com>
Signed-off-by: Aaron Sierra <asierra@xes-inc.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>
28 lines
811 B
Plaintext
28 lines
811 B
Plaintext
* Bus Enumeration by Freescale PCI-X Agent
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Typically any Freescale PCI-X bridge hardware strapped into Agent mode
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is prevented from enumerating the bus. The PrPMC form-factor requires
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all mezzanines to be PCI-X Agents, but one per system may still
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enumerate the bus.
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The property defined below will allow a PCI-X bridge to be used for bus
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enumeration despite being strapped into Agent mode.
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Required properties:
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- fsl,pci-agent-force-enum : There is no value associated with this
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property. The property itself is treated as a boolean.
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Example:
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/* PCI-X bridge known to be PrPMC Monarch */
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pci0: pci@ef008000 {
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fsl,pci-agent-force-enum;
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#interrupt-cells = <1>;
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#size-cells = <2>;
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#address-cells = <3>;
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compatible = "fsl,mpc8540-pcix", "fsl,mpc8540-pci";
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device_type = "pci";
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...
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...
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};
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