From: Juergen Beisert <jbe@xxxxxxxxxxxxxx>
This patch adds support for Message Signaled Interrupt in the
imx6q-pcie driver. It is done in a similar way as for the Exynos
PCIe driver (commit f342d940ee0e3a2b5197fd4fbade1cb6bbc960b7),
which is also using the Synopsys designware PCIe IP core.
Signed-off-by: Harro Haan <hrhaan@xxxxxxxxx>
Signed-off-by: Juergen Beisert <jbe@xxxxxxxxxxxxxx>
Signed-off-by: Lucas Stach <l.stach@xxxxxxxxxxxxxx>
---
drivers/pci/host/pci-imx6.c | 29 +++++++++++++++++++++++++++++
1 file changed, 29 insertions(+)
diff --git a/drivers/pci/host/pci-imx6.c b/drivers/pci/host/pci-imx6.c
index ee082509b0ba..8076a79d975f 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"
@@ -329,6 +330,17 @@ static int imx6_pcie_wait_for_link(struct pcie_port *pp)
return 0;
}
+/* legacy IRQD/MSI interrupt */
+static irqreturn_t imx6_pcie_irqd_msi_handler(int irq, void *arg)
+{
+ struct pcie_port *pp = arg;
+
+ if (IS_ENABLED(CONFIG_PCI_MSI))
+ dw_handle_msi_irq(pp);
+
+ return IRQ_HANDLED;
+}
+
static int imx6_pcie_start_link(struct pcie_port *pp)
{
struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
@@ -403,6 +415,9 @@ 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)
@@ -498,6 +513,20 @@ static int imx6_add_pcie_port(struct pcie_port *pp,
return -ENODEV;
}
+ if (IS_ENABLED(CONFIG_PCI_MSI)) {
+ pp->msi_irq = platform_get_irq(pdev, 3);
+ if (!pp->msi_irq) {
+ dev_err(&pdev->dev, "failed to get INTD/MSI\n");
+ return -ENODEV;
+ }
+
+ ret = devm_request_irq(&pdev->dev, pp->msi_irq,
+ imx6_pcie_irqd_msi_handler,
+ IRQF_SHARED, "mx6-pcie-msi", pp);
+ if (ret)
+ dev_err(&pdev->dev, "failed to request INTD/MCI irq\n");
+ }
+
pp->root_bus_nr = -1;
pp->ops = &imx6_pcie_host_ops;
--
1.8.5.3
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