linux-kernel - [PATCH 3/3] PCI: mt7621: Use PCI_CONF1_EXT

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Date:   Sat, 24 Sep 2022 11:24:04 +0200
From:   Pali Rohár <pali@...nel.org>
To:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Sergio Paracuellos <sergio.paracuellos@...il.com>,
        Matthias Brugger <matthias.bgg@...il.com>
Cc:     linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org
Subject: [PATCH 3/3] PCI: mt7621: Use PCI_CONF1_EXT_ADDRESS() macro

Simplify pcie-mt7621.c driver code and use new PCI_CONF1_EXT_ADDRESS()
macro for accessing PCIe config space.

Signed-off-by: Pali Rohár <pali@...nel.org>
---
 drivers/pci/controller/pcie-mt7621.c | 17 ++++++-----------
 1 file changed, 6 insertions(+), 11 deletions(-)

diff --git a/drivers/pci/controller/pcie-mt7621.c b/drivers/pci/controller/pcie-mt7621.c
index 33eb37a2225c..4bd1abf26008 100644
--- a/drivers/pci/controller/pcie-mt7621.c
+++ b/drivers/pci/controller/pcie-mt7621.c
@@ -30,6 +30,8 @@
 #include <linux/reset.h>
 #include <linux/sys_soc.h>
 
+#include "../pci.h"
+
 /* MediaTek-specific configuration registers */
 #define PCIE_FTS_NUM			0x70c
 #define PCIE_FTS_NUM_MASK		GENMASK(15, 8)
@@ -120,19 +122,12 @@ static inline void pcie_port_write(struct mt7621_pcie_port *port,
 	writel_relaxed(val, port->base + reg);
 }
 
-static inline u32 mt7621_pcie_get_cfgaddr(unsigned int bus, unsigned int slot,
-					 unsigned int func, unsigned int where)
-{
-	return (((where & 0xf00) >> 8) << 24) | (bus << 16) | (slot << 11) |
-		(func << 8) | (where & 0xfc) | 0x80000000;
-}
-
 static void __iomem *mt7621_pcie_map_bus(struct pci_bus *bus,
 					 unsigned int devfn, int where)
 {
 	struct mt7621_pcie *pcie = bus->sysdata;
-	u32 address = mt7621_pcie_get_cfgaddr(bus->number, PCI_SLOT(devfn),
-					     PCI_FUNC(devfn), where);
+	u32 address = PCI_CONF1_EXT_ADDRESS(bus->number, PCI_SLOT(devfn),
+					    PCI_FUNC(devfn), where);
 
 	writel_relaxed(address, pcie->base + RALINK_PCI_CONFIG_ADDR);
 
@@ -147,7 +142,7 @@ static struct pci_ops mt7621_pcie_ops = {
 
 static u32 read_config(struct mt7621_pcie *pcie, unsigned int dev, u32 reg)
 {
-	u32 address = mt7621_pcie_get_cfgaddr(0, dev, 0, reg);
+	u32 address = PCI_CONF1_EXT_ADDRESS(0, dev, 0, reg);
 
 	pcie_write(pcie, address, RALINK_PCI_CONFIG_ADDR);
 	return pcie_read(pcie, RALINK_PCI_CONFIG_DATA);
@@ -156,7 +151,7 @@ static u32 read_config(struct mt7621_pcie *pcie, unsigned int dev, u32 reg)
 static void write_config(struct mt7621_pcie *pcie, unsigned int dev,
 			 u32 reg, u32 val)
 {
-	u32 address = mt7621_pcie_get_cfgaddr(0, dev, 0, reg);
+	u32 address = PCI_CONF1_EXT_ADDRESS(0, dev, 0, reg);
 
 	pcie_write(pcie, address, RALINK_PCI_CONFIG_ADDR);
 	pcie_write(pcie, val, RALINK_PCI_CONFIG_DATA);
-- 
2.20.1