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PCI: imx6: Add support for MSI

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

Signed-off-by: Harro Haan <hrhaan@gmail.com>
Signed-off-by: Juergen Beisert <jbe@pengutronix.de>
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Richard Zhu <r65037@freescale.com>
This commit is contained in:
Lucas Stach 2014-03-28 17:52:59 +01:00 committed by Bjorn Helgaas
parent 7f4f16eef5
commit d1dc9749a5
1 changed files with 27 additions and 0 deletions
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27
drivers/pci/host/pci-imx6.c
View file

@ -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;