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Commit d1dc9749 authored by Lucas Stach's avatar Lucas Stach Committed by Bjorn Helgaas
Browse files

PCI: imx6: Add support for MSI 



This patch adds support for Message Signaled Interrupts in the imx6-pcie
driver.

Signed-off-by: default avatarHarro Haan <hrhaan@gmail.com>
Signed-off-by: default avatarJuergen Beisert <jbe@pengutronix.de>
Signed-off-by: default avatarLucas Stach <l.stach@pengutronix.de>
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
Acked-by: default avatarRichard Zhu <r65037@freescale.com>
parent 7f4f16ee

drivers/pci/host/pci-imx6.c

+27 −0
Original line number Diff line number Diff line
@@ -25,6 +25,7 @@ 
#include <linux/resource.h>

#include <linux/signal.h>

#include <linux/types.h>

#include <linux/interrupt.h>



#include "pcie-designware.h"
@@ -314,6 +315,13 @@ static int imx6_pcie_wait_for_link(struct pcie_port *pp) 
	return 0;

}



static irqreturn_t imx6_pcie_msi_handler(int irq, void *arg)

{

	struct pcie_port *pp = arg;



	return dw_handle_msi_irq(pp);

}



static int imx6_pcie_start_link(struct pcie_port *pp)

{

	struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
@@ -388,6 +396,9 @@ static void imx6_pcie_host_init(struct pcie_port *pp) 
	dw_pcie_setup_rc(pp);



	imx6_pcie_start_link(pp);



	if (IS_ENABLED(CONFIG_PCI_MSI))

		dw_pcie_msi_init(pp);

}



static void imx6_pcie_reset_phy(struct pcie_port *pp)
@@ -477,6 +488,22 @@ static int __init imx6_add_pcie_port(struct pcie_port *pp, 
{

	int ret;



	if (IS_ENABLED(CONFIG_PCI_MSI)) {

		pp->msi_irq = platform_get_irq_byname(pdev, "msi");

		if (pp->msi_irq <= 0) {

			dev_err(&pdev->dev, "failed to get MSI irq\n");

			return -ENODEV;

		}



		ret = devm_request_irq(&pdev->dev, pp->msi_irq,

		                       imx6_pcie_msi_handler,

		                       IRQF_SHARED, "mx6-pcie-msi", pp);

		if (ret) {

			dev_err(&pdev->dev, "failed to request MSI irq\n");

			return -ENODEV;

		}

	}



	pp->root_bus_nr = -1;

	pp->ops = &imx6_pcie_host_ops;