linux-kernel - [PATCH v8 1/3] PCI: iproc: factor out ep configuration access

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Date:   Thu, 24 Aug 2017 10:34:24 +0530
From:   Oza Pawandeep <oza.oza@...adcom.com>
To:     Bjorn Helgaas <bhelgaas@...gle.com>, <helgaas@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        Jon Mason <jonmason@...adcom.com>,
        bcm-kernel-feedback-list@...adcom.com,
        Oza Pawandeep <oza.oza@...adcom.com>,
        Andy Gospodarek <gospo@...adcom.com>,
        linux-pci@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Oza Pawandeep <oza.pawandeep@...il.com>
Subject: [PATCH v8 1/3] PCI: iproc: factor out ep configuration access

This patch factors out ep configuration access
as a separate function.

Signed-off-by: Oza Pawandeep <oza.oza@...adcom.com>

diff --git a/drivers/pci/host/pcie-iproc.c b/drivers/pci/host/pcie-iproc.c
index c574863..61d9be6 100644
--- a/drivers/pci/host/pcie-iproc.c
+++ b/drivers/pci/host/pcie-iproc.c
@@ -448,6 +448,31 @@ static inline void iproc_pcie_apb_err_disable(struct pci_bus *bus,
 	}
 }
 
+static void __iomem *iproc_pcie_map_ep_cfg_reg(struct iproc_pcie *pcie,
+					       unsigned int busno,
+					       unsigned int slot,
+					       unsigned int fn,
+					       int where)
+{
+	u16 offset;
+	u32 val;
+
+	/* EP device access */
+	val = (busno << CFG_ADDR_BUS_NUM_SHIFT) |
+		(slot << CFG_ADDR_DEV_NUM_SHIFT) |
+		(fn << CFG_ADDR_FUNC_NUM_SHIFT) |
+		(where & CFG_ADDR_REG_NUM_MASK) |
+		(1 & CFG_ADDR_CFG_TYPE_MASK);
+
+	iproc_pcie_write_reg(pcie, IPROC_PCIE_CFG_ADDR, val);
+	offset = iproc_pcie_reg_offset(pcie, IPROC_PCIE_CFG_DATA);
+
+	if (iproc_pcie_reg_is_invalid(offset))
+		return NULL;
+
+	return (pcie->base + offset);
+}
+
 /**
  * Note access to the configuration registers are protected at the higher layer
  * by 'pci_lock' in drivers/pci/access.c
@@ -459,7 +484,6 @@ static void __iomem *iproc_pcie_map_cfg_bus(struct iproc_pcie *pcie,
 {
 	unsigned slot = PCI_SLOT(devfn);
 	unsigned fn = PCI_FUNC(devfn);
-	u32 val;
 	u16 offset;
 
 	/* root complex access */
@@ -484,18 +508,7 @@ static void __iomem *iproc_pcie_map_cfg_bus(struct iproc_pcie *pcie,
 		if (slot > 0)
 			return NULL;
 
-	/* EP device access */
-	val = (busno << CFG_ADDR_BUS_NUM_SHIFT) |
-		(slot << CFG_ADDR_DEV_NUM_SHIFT) |
-		(fn << CFG_ADDR_FUNC_NUM_SHIFT) |
-		(where & CFG_ADDR_REG_NUM_MASK) |
-		(1 & CFG_ADDR_CFG_TYPE_MASK);
-	iproc_pcie_write_reg(pcie, IPROC_PCIE_CFG_ADDR, val);
-	offset = iproc_pcie_reg_offset(pcie, IPROC_PCIE_CFG_DATA);
-	if (iproc_pcie_reg_is_invalid(offset))
-		return NULL;
-	else
-		return (pcie->base + offset);
+	return iproc_pcie_map_ep_cfg_reg(pcie, busno, slot, fn, where);
 }
 
 static void __iomem *iproc_pcie_bus_map_cfg_bus(struct pci_bus *bus,
-- 
1.9.1