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From:   Kishon Vijay Abraham I <kishon@ti.com>
To:     Murali Karicheri <m-karicheri2@ti.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
        Gustavo Pimentel <gustavo.pimentel@synopsys.com>,
        Marc Zyngier <marc.zyngier@arm.com>
CC:     Bjorn Helgaas <bhelgaas@google.com>,
        Jingoo Han <jingoohan1@gmail.com>, <linux-pci@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>,
        <linux-kernel@vger.kernel.org>, <kishon@ti.com>
Subject: [PATCH 06/10] PCI: keystone: Cleanup ks_pcie_msi_irq_handler and ks_pcie_legacy_irq_handler
Date:   Wed, 19 Dec 2018 18:12:03 +0530
Message-ID: <20181219124207.13479-7-kishon@ti.com>
In-Reply-To: <20181219124207.13479-1-kishon@ti.com>
References: <20181219124207.13479-1-kishon@ti.com>
MIME-Version: 1.0
Content-Type: text/plain
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Both ks_pcie_msi_irq_handler() and ks_pcie_legacy_irq_handler() invokes
ks_pcie_handle_msi_irq() and ks_pcie_handle_legacy_irq() respectively
for handling the interrupts.

Having two functions for handling the interrupt was used when keystone
PCIe driver was implemented using two files. But with
commit b492aca35c982011500377797d2 ("PCI: keystone: Merge
pci-keystone-dw.c and pci-keystone.c"), which merged the keystone PCIe
driver to use a single file, two functions for handling the
interrupt handler is not required.

Handle both MSI interrupt and legacy interrupt in a single interrupt
handler here.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
---
 drivers/pci/controller/dwc/pci-keystone.c | 92 ++++++++++-------------
 1 file changed, 39 insertions(+), 53 deletions(-)

diff --git a/drivers/pci/controller/dwc/pci-keystone.c b/drivers/pci/controller/dwc/pci-keystone.c
index 8a78307dac99..05b2bd613c68 100644
--- a/drivers/pci/controller/dwc/pci-keystone.c
+++ b/drivers/pci/controller/dwc/pci-keystone.c
@@ -104,13 +104,6 @@ struct keystone_pcie {
 	struct resource		app;
 };
 
-static inline void update_reg_offset_bit_pos(u32 offset, u32 *reg_offset,
-					     u32 *bit_pos)
-{
-	*reg_offset = offset % 8;
-	*bit_pos = offset >> 3;
-}
-
 static phys_addr_t ks_pcie_get_msi_addr(struct pcie_port *pp)
 {
 	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
@@ -130,31 +123,6 @@ static void ks_pcie_app_writel(struct keystone_pcie *ks_pcie, u32 offset,
 	writel(val, ks_pcie->va_app_base + offset);
 }
 
-static void ks_pcie_handle_msi_irq(struct keystone_pcie *ks_pcie, int offset)
-{
-	struct dw_pcie *pci = ks_pcie->pci;
-	struct pcie_port *pp = &pci->pp;
-	struct device *dev = pci->dev;
-	u32 pending, vector;
-	int src, virq;
-
-	pending = ks_pcie_app_readl(ks_pcie, MSI_IRQ_STATUS(offset));
-
-	/*
-	 * MSI0 status bit 0-3 shows vectors 0, 8, 16, 24, MSI1 status bit
-	 * shows 1, 9, 17, 25 and so forth
-	 */
-	for (src = 0; src < 4; src++) {
-		if (BIT(src) & pending) {
-			vector = offset + (src << 3);
-			virq = irq_linear_revmap(pp->irq_domain, vector);
-			dev_dbg(dev, "irq: bit %d, vector %d, virq %d\n",
-				src, vector, virq);
-			generic_handle_irq(virq);
-		}
-	}
-}
-
 static void ks_pcie_msi_irq_ack(int irq, struct pcie_port *pp)
 {
 	u32 reg_offset, bit_pos;
@@ -163,7 +131,9 @@ static void ks_pcie_msi_irq_ack(int irq, struct pcie_port *pp)
 
 	pci = to_dw_pcie_from_pp(pp);
 	ks_pcie = to_keystone_pcie(pci);
-	update_reg_offset_bit_pos(irq, &reg_offset, &bit_pos);
+
+	reg_offset = irq % 8;
+	bit_pos = irq >> 3;
 
 	ks_pcie_app_writel(ks_pcie, MSI_IRQ_STATUS(reg_offset),
 			   BIT(bit_pos));
@@ -176,7 +146,9 @@ static void ks_pcie_msi_set_irq(struct pcie_port *pp, int irq)
 	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
 	struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);
 
-	update_reg_offset_bit_pos(irq, &reg_offset, &bit_pos);
+	reg_offset = irq % 8;
+	bit_pos = irq >> 3;
+
 	ks_pcie_app_writel(ks_pcie, MSI_IRQ_ENABLE_SET(reg_offset),
 			   BIT(bit_pos));
 }
@@ -187,7 +159,9 @@ static void ks_pcie_msi_clear_irq(struct pcie_port *pp, int irq)
 	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
 	struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);
 
-	update_reg_offset_bit_pos(irq, &reg_offset, &bit_pos);
+	reg_offset = irq % 8;
+	bit_pos = irq >> 3;
+
 	ks_pcie_app_writel(ks_pcie, MSI_IRQ_ENABLE_CLR(reg_offset),
 			   BIT(bit_pos));
 }
@@ -197,21 +171,6 @@ static int ks_pcie_msi_host_init(struct pcie_port *pp)
 	return dw_pcie_allocate_domains(pp);
 }
 
-static void ks_pcie_handle_legacy_irq(struct keystone_pcie *ks_pcie,
-				      int offset)
-{
-	struct dw_pcie *pci = ks_pcie->pci;
-	struct device *dev = pci->dev;
-	int virq;
-
-	virq = irq_linear_revmap(ks_pcie->legacy_irq_domain, offset);
-	dev_dbg(dev, ": irq: irq_offset %d, virq %d\n", offset, virq);
-	generic_handle_irq(virq);
-
-	/* EOI the INTx interrupt */
-	ks_pcie_app_writel(ks_pcie, IRQ_EOI, offset);
-}
-
 static void ks_pcie_enable_error_irq(struct keystone_pcie *ks_pcie)
 {
 	ks_pcie_app_writel(ks_pcie, ERR_IRQ_ENABLE_SET, ERR_IRQ_ALL);
@@ -530,8 +489,13 @@ static void ks_pcie_msi_irq_handler(struct irq_desc *desc)
 	struct keystone_pcie *ks_pcie = irq_desc_get_handler_data(desc);
 	u32 offset = irq - ks_pcie->msi_host_irq;
 	struct dw_pcie *pci = ks_pcie->pci;
+	struct pcie_port *pp = &pci->pp;
 	struct device *dev = pci->dev;
 	struct irq_chip *chip = irq_desc_get_chip(desc);
+	u32 vector;
+	u32 virq;
+	u32 reg;
+	u32 pos;
 
 	dev_dbg(dev, "%s, irq %d\n", __func__, irq);
 
@@ -541,7 +505,23 @@ static void ks_pcie_msi_irq_handler(struct irq_desc *desc)
 	 * ack operation.
 	 */
 	chained_irq_enter(chip, desc);
-	ks_pcie_handle_msi_irq(ks_pcie, offset);
+
+	reg = ks_pcie_app_readl(ks_pcie, MSI_IRQ_STATUS(offset));
+	/*
+	 * MSI0 status bit 0-3 shows vectors 0, 8, 16, 24, MSI1 status bit
+	 * shows 1, 9, 17, 25 and so forth
+	 */
+	for (pos = 0; pos < 4; pos++) {
+		if (!(reg & BIT(pos)))
+			continue;
+
+		vector = offset + (pos << 3);
+		virq = irq_linear_revmap(pp->irq_domain, vector);
+		dev_dbg(dev, "irq: bit %d, vector %d, virq %d\n", pos, vector,
+			virq);
+		generic_handle_irq(virq);
+	}
+
 	chained_irq_exit(chip, desc);
 }
 
@@ -561,6 +541,7 @@ static void ks_pcie_legacy_irq_handler(struct irq_desc *desc)
 	struct device *dev = pci->dev;
 	struct irq_chip *chip = irq_desc_get_chip(desc);
 	unsigned int irq_no;
+	u32 virq;
 	u32 reg;
 
 	dev_dbg(dev, ": Handling legacy irq %d\n", irq);
@@ -575,9 +556,14 @@ static void ks_pcie_legacy_irq_handler(struct irq_desc *desc)
 		reg = ks_pcie_app_readl(ks_pcie, IRQ_STATUS(irq_no));
 		if (!(reg & INTx_EN))
 			continue;
-		ks_pcie_handle_legacy_irq(ks_pcie, irq_no);
-	}
 
+		virq = irq_linear_revmap(ks_pcie->legacy_irq_domain, irq_no);
+		dev_dbg(dev, ": irq: irq_offset %d, virq %d\n", irq_no, virq);
+		generic_handle_irq(virq);
+
+		/* EOI the INTx interrupt */
+		ks_pcie_app_writel(ks_pcie, IRQ_EOI, irq_no);
+	}
 	chained_irq_exit(chip, desc);
 }
 
-- 
2.17.1