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From:   Gustavo Pimentel <gustavo.pimentel@synopsys.com>
To:     bhelgaas@google.com, lorenzo.pieralisi@arm.com,
        Joao.Pinto@synopsys.com, jingoohan1@gmail.com, kishon@ti.com,
        adouglas@cadence.com, jesper.nilsson@axis.com
Cc:     linux-pci@vger.kernel.org, linux-doc@vger.kernel.org,
        linux-kernel@vger.kernel.org, gustavo.pimentel@synopsys.com
Subject: [PATCH 05/10] PCI: dwc: Add legacy interrupt callback handler
Date:   Fri, 27 Apr 2018 17:57:42 +0100
Message-Id: <8d1204f6e1e0d4ceaa4df30415c025feaa72e6ee.1524845816.git.gustavo.pimentel@synopsys.com>
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References: <cover.1524845816.git.gustavo.pimentel@synopsys.com>
In-Reply-To: <cover.1524845816.git.gustavo.pimentel@synopsys.com>
References: <cover.1524845816.git.gustavo.pimentel@synopsys.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Add a legacy interrupt callback handler. Currently DesignWare IP don't
allow triggering the legacy interrupt.

Signed-off-by: Gustavo Pimentel <gustavo.pimentel@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 1ba3a7f..b599169 100644
--- a/drivers/pci/dwc/pcie-designware-ep.c
+++ b/drivers/pci/dwc/pcie-designware-ep.c
@@ -370,6 +370,16 @@ 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 654dcb5..90a8c95 100644
--- a/drivers/pci/dwc/pcie-designware-plat.c
+++ b/drivers/pci/dwc/pcie-designware-plat.c
@@ -84,8 +84,7 @@ 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 a0ab12f..69e6e17 100644
--- a/drivers/pci/dwc/pcie-designware.h
+++ b/drivers/pci/dwc/pcie-designware.h
@@ -350,6 +350,7 @@ 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,
@@ -369,6 +370,11 @@ 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