linux-kernel - [PATCH v8 13/22] PCI: microchip: Add request_event

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Date:   Wed, 11 Oct 2023 19:05:05 +0800
From:   Minda Chen <minda.chen@...rfivetech.com>
To:     Conor Dooley <conor@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Rob Herring <robh+dt@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        "Daire McNamara" <daire.mcnamara@...rochip.com>,
        Emil Renner Berthing <emil.renner.berthing@...onical.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
CC:     <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-riscv@...ts.infradead.org>, <linux-pci@...r.kernel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Mason Huo <mason.huo@...rfivetech.com>,
        Leyfoon Tan <leyfoon.tan@...rfivetech.com>,
        Kevin Xie <kevin.xie@...rfivetech.com>,
        Minda Chen <minda.chen@...rfivetech.com>
Subject: [PATCH v8 13/22] PCI: microchip: Add request_event_irq() callback function

PolarFire implements specific interrupts besides PLDA local
interrupt and register their interrupt symbol name. (Total 28
interrupts while PLDA contain 13 local interrupts). and
interrupt to event mapping is different.
So add a callback function to support different IRQ register
function.

Signed-off-by: Minda Chen <minda.chen@...rfivetech.com>
---
 .../pci/controller/plda/pcie-microchip-host.c | 25 ++++++++++++++++---
 drivers/pci/controller/plda/pcie-plda.h       |  5 ++++
 2 files changed, 26 insertions(+), 4 deletions(-)

diff --git a/drivers/pci/controller/plda/pcie-microchip-host.c b/drivers/pci/controller/plda/pcie-microchip-host.c
index 1799455989ac..104332603e25 100644
--- a/drivers/pci/controller/plda/pcie-microchip-host.c
+++ b/drivers/pci/controller/plda/pcie-microchip-host.c
@@ -799,6 +799,17 @@ static int mc_pcie_init_clks(struct device *dev)
 	return 0;
 }
 
+static int mc_request_event_irq(struct plda_pcie_rp *plda, int event_irq,
+				int event)
+{
+	return devm_request_irq(plda->dev, event_irq, mc_event_handler,
+				0, event_cause[event].sym, plda);
+}
+
+static const struct plda_event mc_event = {
+	.request_event_irq      = mc_request_event_irq,
+};
+
 static int plda_pcie_init_irq_domains(struct plda_pcie_rp *port)
 {
 	struct device *dev = port->dev;
@@ -898,7 +909,9 @@ static void mc_disable_interrupts(struct mc_pcie *port)
 	writel_relaxed(GENMASK(31, 0), bridge_base_addr + ISTATUS_HOST);
 }
 
-static int plda_init_interrupts(struct platform_device *pdev, struct plda_pcie_rp *port)
+static int plda_init_interrupts(struct platform_device *pdev,
+				struct plda_pcie_rp *port,
+				const struct plda_event *event)
 {
 	struct device *dev = &pdev->dev;
 	int irq;
@@ -922,8 +935,12 @@ static int plda_init_interrupts(struct platform_device *pdev, struct plda_pcie_r
 			return -ENXIO;
 		}
 
-		ret = devm_request_irq(dev, event_irq, mc_event_handler,
-				       0, event_cause[i].sym, port);
+		if (event->request_event_irq)
+			ret = event->request_event_irq(port, event_irq, i);
+		else
+			ret = devm_request_irq(dev, event_irq, plda_event_handler,
+					       0, NULL, port);
+
 		if (ret) {
 			dev_err(dev, "failed to request IRQ %d\n", event_irq);
 			return ret;
@@ -977,7 +994,7 @@ static int mc_platform_init(struct pci_config_window *cfg)
 		return ret;
 
 	/* Address translation is up; safe to enable interrupts */
-	ret = plda_init_interrupts(pdev, &port->plda);
+	ret = plda_init_interrupts(pdev, &port->plda, &mc_event);
 	if (ret)
 		return ret;
 
diff --git a/drivers/pci/controller/plda/pcie-plda.h b/drivers/pci/controller/plda/pcie-plda.h
index b439160448b1..907ad40f3188 100644
--- a/drivers/pci/controller/plda/pcie-plda.h
+++ b/drivers/pci/controller/plda/pcie-plda.h
@@ -121,6 +121,11 @@ struct plda_pcie_rp {
 	int num_events;
 };
 
+struct plda_event {
+	int (*request_event_irq)(struct plda_pcie_rp *pcie,
+				 int event_irq, int event);
+};
+
 irqreturn_t plda_event_handler(int irq, void *dev_id);
 void plda_pcie_setup_window(void __iomem *bridge_base_addr, u32 index,
 			    phys_addr_t axi_addr, phys_addr_t pci_addr,
-- 
2.17.1