[RFC 05/10] PCI: dwc: Add legacy interrupt callback handler

[Gustavo Pimentel]

Adds a legacy interrupt callback handler. Currently Designware IP doesn't
allow triggering the legacy interrupt.

Signed-off-by: Gustavo Pimentel <gustavo.pimen...@synopsys.com>
---
 drivers/pci/dwc/pcie-designware-ep.c   | 10 ++++++++++
 drivers/pci/dwc/pcie-designware-plat.c |  3 +--
 drivers/pci/dwc/pcie-designware.h      |  6 ++++++
 3 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/dwc/pcie-designware-ep.c 
b/drivers/pci/dwc/pcie-designware-ep.c
index e352786..fb55259 100644
--- a/drivers/pci/dwc/pcie-designware-ep.c
+++ b/drivers/pci/dwc/pcie-designware-ep.c
@@ -375,6 +375,16 @@ static const struct pci_epc_ops epc_ops = {
        .stop                   = dw_pcie_ep_stop,
 };
 
+int dw_pcie_ep_raise_legacy_irq(struct dw_pcie_ep *ep, u8 func_no)
+{
+       struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
+       struct device *dev = pci->dev;
+
+       dev_err(dev, "EP cannot trigger legacy IRQs\n");
+
+       return -EINVAL;
+}
+
 int dw_pcie_ep_raise_msi_irq(struct dw_pcie_ep *ep, u8 func_no,
                             u8 interrupt_num)
 {
diff --git a/drivers/pci/dwc/pcie-designware-plat.c 
b/drivers/pci/dwc/pcie-designware-plat.c
index c3a4707..3874b02 100644
--- a/drivers/pci/dwc/pcie-designware-plat.c
+++ b/drivers/pci/dwc/pcie-designware-plat.c
@@ -86,8 +86,7 @@ static int dw_plat_pcie_ep_raise_irq(struct dw_pcie_ep *ep, 
u8 func_no,
 
        switch (type) {
        case PCI_EPC_IRQ_LEGACY:
-               dev_err(pci->dev, "EP cannot trigger legacy IRQs\n");
-               return -EINVAL;
+               return dw_pcie_ep_raise_legacy_irq(ep, func_no);
        case PCI_EPC_IRQ_MSI:
                return dw_pcie_ep_raise_msi_irq(ep, func_no, interrupt_num);
        case PCI_EPC_IRQ_MSIX:
diff --git a/drivers/pci/dwc/pcie-designware.h 
b/drivers/pci/dwc/pcie-designware.h
index 2acf18b0..808b280 100644
--- a/drivers/pci/dwc/pcie-designware.h
+++ b/drivers/pci/dwc/pcie-designware.h
@@ -354,6 +354,7 @@ static inline int dw_pcie_allocate_domains(struct pcie_port 
*pp)
 void dw_pcie_ep_linkup(struct dw_pcie_ep *ep);
 int dw_pcie_ep_init(struct dw_pcie_ep *ep);
 void dw_pcie_ep_exit(struct dw_pcie_ep *ep);
+int dw_pcie_ep_raise_legacy_irq(struct dw_pcie_ep *ep, u8 func_no);
 int dw_pcie_ep_raise_msi_irq(struct dw_pcie_ep *ep, u8 func_no,
                             u8 interrupt_num);
 int dw_pcie_ep_raise_msix_irq(struct dw_pcie_ep *ep, u8 func_no,
@@ -374,6 +375,11 @@ static inline void dw_pcie_ep_exit(struct dw_pcie_ep *ep)
 {
 }
 
+static inline int dw_pcie_ep_raise_legacy_irq(struct dw_pcie_ep *ep, u8 
func_no)
+{
+       return 0;
+}
+
 static inline int dw_pcie_ep_raise_msi_irq(struct dw_pcie_ep *ep, u8 func_no,
                                           u8 interrupt_num)
 {
-- 
2.7.4


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