PCI: imx6: Add support for MSI
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>
diff --git a/drivers/pci/host/pci-imx6.c b/drivers/pci/host/pci-imx6.c
index 29e7750..a5645ae 100644
--- a/drivers/pci/host/pci-imx6.c
+++ b/drivers/pci/host/pci-imx6.c
@@ -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 @@
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 @@
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 @@
{
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;