PCI: dwc: Add support to use non default msi_irq_chip

Platforms using DesignWare IP use dw_pci_msi_bottom_irq_chip for
configuring the MSI controller logic within the DesignWare IP. However
certain platforms like Keystone (K2G) which uses DesignWare IP have
their own MSI controller logic. For handling such platforms,
the irqchip ops use msi_irq_ack(), msi_set_irq(), msi_clear_irq()
callback functions.

Add support to use different msi_irq_chip with default set to
dw_pci_msi_bottom_irq_chip. This is in preparation to get rid of
msi_irq_ack(), msi_set_irq(), msi_clear_irq() and other Keystone
specific dw_pcie_host_ops.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>

diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index 25087d3..e28cb08 100644 (file)
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -245,7 +245,7 @@ static int dw_pcie_irq_domain_alloc(struct irq_domain *domain,
 
        for (i = 0; i < nr_irqs; i++)
                irq_domain_set_info(domain, virq + i, bit + i,
-                                   &dw_pci_msi_bottom_irq_chip,
+                                   pp->msi_irq_chip,
                                    pp, handle_edge_irq,
                                    NULL, NULL);
 
@@ -277,6 +277,9 @@ int dw_pcie_allocate_domains(struct pcie_port *pp)
        struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
        struct fwnode_handle *fwnode = of_node_to_fwnode(pci->dev->of_node);
 
+       if (!pp->msi_irq_chip)
+               pp->msi_irq_chip = &dw_pci_msi_bottom_irq_chip;
+
        pp->irq_domain = irq_domain_create_linear(fwnode, pp->num_vectors,
                                               &dw_pcie_msi_domain_ops, pp);
        if (!pp->irq_domain) {

diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index 377f4c0..6b0cea4 100644 (file)
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -179,6 +179,7 @@ struct pcie_port {
        struct irq_domain       *irq_domain;
        struct irq_domain       *msi_domain;
        dma_addr_t              msi_data;
+       struct irq_chip         *msi_irq_chip;
        u32                     num_vectors;
        u32                     irq_mask[MAX_MSI_CTRLS];
        raw_spinlock_t          lock;