MIPS: Netlogic: MSI enable fix for XLS

MSI interrupts do not work on XLS after commit a776c49
( "PCI: msi: Disable msi interrupts when we initialize a pci device" )
because the change disables MSI interrupts on the XLS PCIe bridges
during the PCI enumeration.

Fix this by enabling MSI interrupts on the bridge in the
arch_setup_msi_irq() function. A new function xls_get_pcie_link()
has been introduced to get the PCI device corresponding to the
top level PCIe bridge on which MSI has to be enabled.

Also, update get_irq_vector() to use the new xls_get_pcie_link()
function and PCI_SLOT() macro for determining the IRQ of PCI devices.

Signed-off-by: Ganesan Ramalingam <ganesanr@broadcom.com>
Signed-off-by: Jayachandran C <jayachandranc@netlogicmicro.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/3753/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 50 insertions, 9 deletions

diff --git a/arch/mips/pci/pci-xlr.c b/arch/mips/pci/pci-xlr.c
index 50ff4dc28b4f..172af1cd5867 100644
--- a/arch/mips/pci/pci-xlr.c
+++ b/arch/mips/pci/pci-xlr.c
@@ -41,6 +41,7 @@
 #include <linux/irq.h>
 #include <linux/irqdesc.h>
 #include <linux/console.h>
+#include <linux/pci_regs.h>
 
 #include <asm/io.h>
 
@@ -156,35 +157,55 @@ struct pci_controller nlm_pci_controller = {
         .io_offset      = 0x00000000UL,
 };
 
+/*
+ * The top level PCIe links on the XLS PCIe controller appear as
+ * bridges. Given a device, this function finds which link it is
+ * on.
+ */
+static struct pci_dev *xls_get_pcie_link(const struct pci_dev *dev)
+{
+        struct pci_bus *bus, *p;
+
+        /* Find the bridge on bus 0 */
+        bus = dev->bus;
+        for (p = bus->parent; p && p->number != 0; p = p->parent)
+                bus = p;
+
+        return p ? bus->self : NULL;
+}
+
 static int get_irq_vector(const struct pci_dev *dev)
 {
+        struct pci_dev *lnk;
+
         if (!nlm_chip_is_xls())
-                return  PIC_PCIX_IRQ;   /* for XLR just one IRQ*/
+                return  PIC_PCIX_IRQ;   /* for XLR just one IRQ */
 
         /*
          * For XLS PCIe, there is an IRQ per Link, find out which
          * link the device is on to assign interrupts
-        */
-        if (dev->bus->self == NULL)
+         */
+        lnk = xls_get_pcie_link(dev);
+        if (lnk == NULL)
                 return 0;
 
-        switch  (dev->bus->self->devfn) {
-        case 0x0:
+        switch  (PCI_SLOT(lnk->devfn)) {
+        case 0:
                 return PIC_PCIE_LINK0_IRQ;
-        case 0x8:
+        case 1:
                 return PIC_PCIE_LINK1_IRQ;
-        case 0x10:
+        case 2:
                 if (nlm_chip_is_xls_b())
                         return PIC_PCIE_XLSB0_LINK2_IRQ;
                 else
                         return PIC_PCIE_LINK2_IRQ;
-        case 0x18:
+        case 3:
                 if (nlm_chip_is_xls_b())
                         return PIC_PCIE_XLSB0_LINK3_IRQ;
                 else
                         return PIC_PCIE_LINK3_IRQ;
         }
-        WARN(1, "Unexpected devfn %d\n", dev->bus->self->devfn);
+        WARN(1, "Unexpected devfn %d\n", lnk->devfn);
         return 0;
 }
 
@@ -202,7 +223,27 @@ void arch_teardown_msi_irq(unsigned int irq)
 int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc)
 {
         struct msi_msg msg;
+        struct pci_dev *lnk;
         int irq, ret;
+        u16 val;
+
+        /* MSI not supported on XLR */
+        if (!nlm_chip_is_xls())
+                return 1;
+
+        /*
+         * Enable MSI on the XLS PCIe controller bridge which was disabled
+         * at enumeration, the bridge MSI capability is at 0x50
+         */
+        lnk = xls_get_pcie_link(dev);
+        if (lnk == NULL)
+                return 1;
+
+        pci_read_config_word(lnk, 0x50 + PCI_MSI_FLAGS, &val);
+        if ((val & PCI_MSI_FLAGS_ENABLE) == 0) {
+                val |= PCI_MSI_FLAGS_ENABLE;
+                pci_write_config_word(lnk, 0x50 + PCI_MSI_FLAGS, val);
+        }
 
         irq = get_irq_vector(dev);
         if (irq <= 0)