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From: Kishon Vijay Abraham I <kishon@ti.com>
To: Jingoo Han <jingoohan1@gmail.com>,
	Joao Pinto <Joao.Pinto@synopsys.com>,
	Bjorn Helgaas <bhelgaas@google.com>,
	Rob Herring <robh+dt@kernel.org>,
	Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
	Murali Karicheri <m-karicheri2@ti.com>,
	Kishon Vijay Abraham I <kishon@ti.com>,
	<Gustavo.Pimentel@synopsys.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
	Santosh Shilimkar <ssantosh@kernel.org>,
	Tero Kristo <t-kristo@ti.com>, Nishanth Menon <nm@ti.com>,
	<linux-pci@vger.kernel.org>, <devicetree@vger.kernel.org>,
	<linux-kernel@vger.kernel.org>,
	<linux-arm-kernel@lists.infradead.org>
Subject: [RFC PATCH 17/40] PCI: keystone: Cleanup configuration space access
Date: Fri, 21 Sep 2018 15:51:32 +0530	[thread overview]
Message-ID: <20180921102155.22839-18-kishon@ti.com> (raw)
In-Reply-To: <20180921102155.22839-1-kishon@ti.com>

Cleanup configuration space access by removing ks_pcie_cfg_setup
which has an unncessary check of "if (bus == 0)" which will never be the
case of *_other_conf() and adding macros for configuring the CFG_SETUP
register required for accessing the configuration space of the device.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
---
 drivers/pci/controller/dwc/pci-keystone.c | 70 +++++++----------------
 1 file changed, 20 insertions(+), 50 deletions(-)

diff --git a/drivers/pci/controller/dwc/pci-keystone.c b/drivers/pci/controller/dwc/pci-keystone.c
index f230344e1f4e..3ead1162235f 100644
--- a/drivers/pci/controller/dwc/pci-keystone.c
+++ b/drivers/pci/controller/dwc/pci-keystone.c
@@ -45,7 +45,13 @@
 
 /* Application registers */
 #define CMD_STATUS			0x004
+
 #define CFG_SETUP			0x008
+#define CFG_BUS(x)			(((x) & 0xff) << 16)
+#define CFG_DEVICE(x)			(((x) & 0x1f) << 8)
+#define CFG_FUNC(x)			((x) & 0x7)
+#define CFG_TYPE1			BIT(24)
+
 #define OB_SIZE				0x030
 #define CFG_PCIM_WIN_SZ_IDX		3
 #define CFG_PCIM_WIN_CNT		32
@@ -261,60 +267,21 @@ static void ks_pcie_setup_rc_app_regs(struct keystone_pcie *ks_pcie)
 	ks_pcie_app_writel(ks_pcie, CMD_STATUS, OB_XLAT_EN_VAL | val);
 }
 
-/**
- * ks_pcie_cfg_setup() - Set up configuration space address for a device
- *
- * @ks_pcie: ptr to keystone_pcie structure
- * @bus: Bus number the device is residing on
- * @devfn: device, function number info
- *
- * Forms and returns the address of configuration space mapped in PCIESS
- * address space 0.  Also configures CFG_SETUP for remote configuration space
- * access.
- *
- * The address space has two regions to access configuration - local and remote.
- * We access local region for bus 0 (as RC is attached on bus 0) and remote
- * region for others with TYPE 1 access when bus > 1.  As for device on bus = 1,
- * we will do TYPE 0 access as it will be on our secondary bus (logical).
- * CFG_SETUP is needed only for remote configuration access.
- */
-static void __iomem *ks_pcie_cfg_setup(struct keystone_pcie *ks_pcie, u8 bus,
-				       unsigned int devfn)
-{
-	u8 device = PCI_SLOT(devfn), function = PCI_FUNC(devfn);
-	struct dw_pcie *pci = ks_pcie->pci;
-	struct pcie_port *pp = &pci->pp;
-	u32 regval;
-
-	if (bus == 0)
-		return pci->dbi_base;
-
-	regval = (bus << 16) | (device << 8) | function;
-
-	/*
-	 * Since Bus#1 will be a virtual bus, we need to have TYPE0
-	 * access only.
-	 * TYPE 1
-	 */
-	if (bus != 1)
-		regval |= BIT(24);
-
-	ks_pcie_app_writel(ks_pcie, CFG_SETUP, regval);
-	return pp->va_cfg0_base;
-}
-
 static int ks_pcie_rd_other_conf(struct pcie_port *pp, struct pci_bus *bus,
 				 unsigned int devfn, int where, int size,
 				 u32 *val)
 {
 	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
 	struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);
-	u8 bus_num = bus->number;
-	void __iomem *addr;
+	u32 reg;
 
-	addr = ks_pcie_cfg_setup(ks_pcie, bus_num, devfn);
+	reg = CFG_BUS(bus->number) | CFG_DEVICE(PCI_SLOT(devfn)) |
+		CFG_FUNC(PCI_FUNC(devfn));
+	if (bus->parent->number != pp->root_bus_nr)
+		reg |= CFG_TYPE1;
+	ks_pcie_app_writel(ks_pcie, CFG_SETUP, reg);
 
-	return dw_pcie_read(addr + where, size, val);
+	return dw_pcie_read(pp->va_cfg0_base + where, size, val);
 }
 
 static int ks_pcie_wr_other_conf(struct pcie_port *pp, struct pci_bus *bus,
@@ -323,12 +290,15 @@ static int ks_pcie_wr_other_conf(struct pcie_port *pp, struct pci_bus *bus,
 {
 	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
 	struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);
-	u8 bus_num = bus->number;
-	void __iomem *addr;
+	u32 reg;
 
-	addr = ks_pcie_cfg_setup(ks_pcie, bus_num, devfn);
+	reg = CFG_BUS(bus->number) | CFG_DEVICE(PCI_SLOT(devfn)) |
+		CFG_FUNC(PCI_FUNC(devfn));
+	if (bus->parent->number != pp->root_bus_nr)
+		reg |= CFG_TYPE1;
+	ks_pcie_app_writel(ks_pcie, CFG_SETUP, reg);
 
-	return dw_pcie_write(addr + where, size, val);
+	return dw_pcie_write(pp->va_cfg0_base + where, size, val);
 }
 
 /**
-- 
2.17.1


  parent reply	other threads:[~2018-09-21 10:28 UTC|newest]

Thread overview: 47+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-09-21 10:21 [RFC PATCH 00/40] Cleanup pci-keystone.c and Add AM654 PCIe Support Kishon Vijay Abraham I
2018-09-21 10:21 ` [RFC PATCH 01/40] PCI: keystone: Use quirk to limit MRRS for K2G Kishon Vijay Abraham I
2018-09-21 10:21 ` [RFC PATCH 02/40] PCI: keystone: Use quirk to set MRRS for PCI host bridge Kishon Vijay Abraham I
2018-09-21 10:21 ` [RFC PATCH 03/40] PCI: keystone: Move dw_pcie_setup_rc out of ks_pcie_establish_link() Kishon Vijay Abraham I
2018-09-21 10:21 ` [RFC PATCH 04/40] PCI: keystone: Do not initiate link training multiple times Kishon Vijay Abraham I
2018-09-21 10:21 ` [RFC PATCH 05/40] PCI: keystone: Remove unused argument from ks_dw_pcie_host_init() Kishon Vijay Abraham I
2018-09-21 10:21 ` [RFC PATCH 06/40] PCI: keystone: Add start_link/stop_link dw_pcie_ops Kishon Vijay Abraham I
2018-09-21 10:21 ` [RFC PATCH 07/40] PCI: keystone: Merge pci-keystone-dw.c and pci-keystone.c Kishon Vijay Abraham I
2018-09-21 10:21 ` [RFC PATCH 08/40] PCI: keystone: Cleanup MSI/legacy interrupt configuration and handling Kishon Vijay Abraham I
2021-07-03 21:01   ` Krzysztof Wilczyński
2021-07-05  8:21     ` Kishon Vijay Abraham I
2021-07-06 20:34       ` Krzysztof Wilczyński
2018-09-21 10:21 ` [RFC PATCH 09/40] PCI: keystone: Remove redundant platform_set_drvdata Kishon Vijay Abraham I
2018-09-21 10:21 ` [RFC PATCH 10/40] PCI: keystone: Use uniform function naming convention Kishon Vijay Abraham I
2018-09-21 10:21 ` [RFC PATCH 11/40] dt-bindings: PCI: keystone: Add bindings to get device control module Kishon Vijay Abraham I
2018-09-21 10:21 ` [RFC PATCH 12/40] PCI: keystone: Use syscon APIs to get device id from " Kishon Vijay Abraham I
2018-09-21 10:21 ` [RFC PATCH 13/40] dt-bindings: PCI: keystone: Add "reg-names" binding information Kishon Vijay Abraham I
     [not found]   ` <5baa1b0e.1c69fb81.4f57b.32f7@mx.google.com>
2018-11-02  7:19     ` Kishon Vijay Abraham I
2018-09-21 10:21 ` [RFC PATCH 14/40] PCI: keystone: Use platform_get_resource_byname to get memory resources Kishon Vijay Abraham I
2018-09-21 10:21 ` [RFC PATCH 15/40] PCI: keystone: Cleanup PHY handling Kishon Vijay Abraham I
2018-09-21 10:21 ` [RFC PATCH 16/40] PCI: keystone: Invoke pm_runtime APIs to enable clock Kishon Vijay Abraham I
2018-09-21 10:21 ` Kishon Vijay Abraham I [this message]
2018-09-21 10:21 ` [RFC PATCH 18/40] PCI: keystone: Get number of OB windows from DT and cleanup MEM space configuration Kishon Vijay Abraham I
2018-09-21 10:21 ` [RFC PATCH 19/40] PCI: keystone: Cleanup set_dbi_mode and get_dbi_mode Kishon Vijay Abraham I
2018-09-21 10:21 ` [RFC PATCH 20/40] PCI: keystone: Cleanup ks_pcie_link_up() Kishon Vijay Abraham I
2018-09-21 10:21 ` [RFC PATCH 21/40] PCI: keystone: Add debug error message for all errors Kishon Vijay Abraham I
2018-09-21 10:21 ` [RFC PATCH 22/40] PCI: keystone: Reorder header file in alphabetical order Kishon Vijay Abraham I
2018-09-21 10:21 ` [RFC PATCH 23/40] PCI: keystone: Cleanup macros defined in pci-keystone.c Kishon Vijay Abraham I
2018-09-21 10:21 ` [RFC PATCH 24/40] PCI: keystone: Move initializations to appropriate places Kishon Vijay Abraham I
2018-09-21 10:21 ` [RFC PATCH 25/40] dt-bindings: PCI: Add dt-binding to configure PCIe mode Kishon Vijay Abraham I
2018-09-21 10:21 ` [RFC PATCH 26/40] PCI: keystone: Explicitly set the " Kishon Vijay Abraham I
2018-09-21 10:21 ` [RFC PATCH 27/40] dt-bindings: PCI: Document "atu" reg-names Kishon Vijay Abraham I
2018-09-21 10:21 ` [RFC PATCH 28/40] PCI: dwc: Fix ATU identification for designware version >= 4.80 Kishon Vijay Abraham I
2018-09-21 10:21 ` [RFC PATCH 29/40] PCI: keystone: Prevent ARM32 specific code to be compiled for ARM64 Kishon Vijay Abraham I
2018-09-21 10:21 ` [RFC PATCH 30/40] dt-bindings: PCI: Add PCI RC dt binding documentation for AM654 Kishon Vijay Abraham I
2018-09-21 10:21 ` [RFC PATCH 31/40] PCI: keystone: Add support for PCIe in AM654x Platforms Kishon Vijay Abraham I
2018-09-21 10:21 ` [RFC PATCH 32/40] phy: core: Invoke pm_runtime_get_*/pm_runtime_put_* before invoking reset callback Kishon Vijay Abraham I
2018-09-21 10:21 ` [RFC PATCH 33/40] dt-bindings: phy: ti: Add dt binding documentation for SERDES in AM654x SoC Kishon Vijay Abraham I
2018-09-21 10:21 ` [RFC PATCH 34/40] phy: ti: Add a new SERDES driver for TI's " Kishon Vijay Abraham I
2018-09-21 10:21 ` [RFC PATCH 35/40] ARM: dts: keystone-k2e: Use the updated binding to describe PCIe in k2e Kishon Vijay Abraham I
2018-09-21 10:21 ` [RFC PATCH 36/40] arm64: dts: k3-am6: Add "socionext,synquacer-pre-its" property to gic_its Kishon Vijay Abraham I
2018-09-21 19:42   ` Nishanth Menon
2018-09-21 10:21 ` [RFC PATCH 37/40] arm64: dts: k3-am6: Add Main System Control Module node Kishon Vijay Abraham I
2018-09-21 10:21 ` [RFC PATCH 38/40] arm64: dts: k3-am6: Add mux-controller dt node required for muxing SERDES Kishon Vijay Abraham I
2018-09-21 10:21 ` [RFC PATCH 39/40] arm64: dts: k3-am6: Add SERDES DT node Kishon Vijay Abraham I
2018-09-21 10:21 ` [RFC PATCH 40/40] arm64: dts: k3-am6: Add Root Complex PCIe dt node Kishon Vijay Abraham I
2018-10-12 13:47 ` [RFC PATCH 00/40] Cleanup pci-keystone.c and Add AM654 PCIe Support Lorenzo Pieralisi

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