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: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Reviewed-by: Thierry Reding <thierry.reding@gmail.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>
diff --git a/drivers/pci/host/pci-mvebu.c b/drivers/pci/host/pci-mvebu.c
index 729d5a1..32ac564 100644
--- a/drivers/pci/host/pci-mvebu.c
+++ b/drivers/pci/host/pci-mvebu.c
@@ -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 {
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 @@
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 @@
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 @@
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 @@
i++;
}
+ mvebu_pcie_msi_enable(pcie);
+
mvebu_pcie_enable(pcie);
return 0;