Commit 5b4deb65 authored by Thomas Petazzoni's avatar Thomas Petazzoni Committed by Jason Cooper
Browse files

PCI: mvebu: add support for MSI 



This commit adds support for Message Signaled Interrupts in the
Marvell PCIe host controller. The work is very simple: it simply gets
a reference to the msi_chip associated to the PCIe controller thanks
to the msi-parent DT property, and stores this reference in the
pci_bus structure. This is enough to let the Linux PCI core use the
functions of msi_chip to setup and teardown MSIs.

Signed-off-by: default avatarThomas Petazzoni <thomas.petazzoni@free-electrons.com>
Reviewed-by: default avatarThierry Reding <thierry.reding@gmail.com>
Acked-by: default avatarBjorn Helgaas <bhelgaas@google.com>
Signed-off-by: default avatarJason Cooper <jason@lakedaemon.net>
parent 31f614ed

Documentation/devicetree/bindings/pci/mvebu-pci.txt

+3 −0
Original line number Diff line number Diff line
@@ -14,6 +14,8 @@ Mandatory properties: 
- ranges: ranges describing the MMIO registers to control the PCIe

  interfaces, and ranges describing the MBus windows needed to access

  the memory and I/O regions of each PCIe interface.

- msi-parent: Link to the hardware entity that serves as the Message

  Signaled Interrupt controller for this PCI controller.



The ranges describing the MMIO registers have the following layout:
@@ -86,6 +88,7 @@ pcie-controller { 
	#size-cells = <2>;



	bus-range = <0x00 0xff>;

	msi-parent = <&mpic>;



	ranges =

	       <0x82000000 0 0x40000 MBUS_ID(0xf0, 0x01) 0x40000 0 0x00002000	/* Port 0.0 registers */

drivers/pci/host/pci-mvebu.c

+26 −0
Original line number Diff line number Diff line
@@ -11,6 +11,7 @@ 
#include <linux/clk.h>

#include <linux/module.h>

#include <linux/mbus.h>

#include <linux/msi.h>

#include <linux/slab.h>

#include <linux/platform_device.h>

#include <linux/of_address.h>
@@ -103,6 +104,7 @@ struct mvebu_pcie_port; 
struct mvebu_pcie {

	struct platform_device *pdev;

	struct mvebu_pcie_port *ports;

	struct msi_chip *msi;

	struct resource io;

	struct resource realio;

	struct resource mem;
@@ -673,6 +675,12 @@ static struct pci_bus *mvebu_pcie_scan_bus(int nr, struct pci_sys_data *sys) 
	return bus;

}



void mvebu_pcie_add_bus(struct pci_bus *bus)

{

	struct mvebu_pcie *pcie = sys_to_pcie(bus->sysdata);

	bus->msi = pcie->msi;

}



resource_size_t mvebu_pcie_align_resource(struct pci_dev *dev,

					  const struct resource *res,

					  resource_size_t start,
@@ -709,6 +717,7 @@ static void __init mvebu_pcie_enable(struct mvebu_pcie *pcie) 
	hw.map_irq        = mvebu_pcie_map_irq;

	hw.ops            = &mvebu_pcie_ops;

	hw.align_resource = mvebu_pcie_align_resource;

	hw.add_bus        = mvebu_pcie_add_bus;



	pci_common_init(&hw);

}
@@ -777,6 +786,21 @@ static int mvebu_get_tgt_attr(struct device_node *np, int devfn, 
	return -ENOENT;

}



static void __init mvebu_pcie_msi_enable(struct mvebu_pcie *pcie)

{

	struct device_node *msi_node;



	msi_node = of_parse_phandle(pcie->pdev->dev.of_node,

				    "msi-parent", 0);

	if (!msi_node)

		return;



	pcie->msi = of_pci_find_msi_chip_by_node(msi_node);



	if (pcie->msi)

		pcie->msi->dev = &pcie->pdev->dev;

}



static int __init mvebu_pcie_probe(struct platform_device *pdev)

{

	struct mvebu_pcie *pcie;
@@ -912,6 +936,8 @@ static int __init mvebu_pcie_probe(struct platform_device *pdev) 
		i++;

	}



	mvebu_pcie_msi_enable(pcie);



	mvebu_pcie_enable(pcie);



	return 0;

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