linux-kernel - [RFC PATCH 20/40] PCI: keystone: Cleanup ks_pcie_link

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Date:   Fri, 21 Sep 2018 15:51:35 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Jingoo Han <jingoohan1@...il.com>,
        Joao Pinto <Joao.Pinto@...opsys.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Rob Herring <robh+dt@...nel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Murali Karicheri <m-karicheri2@...com>,
        Kishon Vijay Abraham I <kishon@...com>,
        <Gustavo.Pimentel@...opsys.com>
CC:     Mark Rutland <mark.rutland@....com>,
        Santosh Shilimkar <ssantosh@...nel.org>,
        Tero Kristo <t-kristo@...com>, Nishanth Menon <nm@...com>,
        <linux-pci@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: [RFC PATCH 20/40] PCI: keystone: Cleanup ks_pcie_link_up()

ks_pcie_link_up() uses registers from the designware core to get the
status of the link. Move the register defines to pcie-designware.h
and cleanup ks_pcie_link_up().

Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
---
 drivers/pci/controller/dwc/pci-keystone.c    | 10 +++-------
 drivers/pci/controller/dwc/pcie-designware.h |  4 ++++
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/pci/controller/dwc/pci-keystone.c b/drivers/pci/controller/dwc/pci-keystone.c
index 728b1e0db314..240c39c58b0f 100644
--- a/drivers/pci/controller/dwc/pci-keystone.c
+++ b/drivers/pci/controller/dwc/pci-keystone.c
@@ -38,8 +38,6 @@
 
 /* Application register defines */
 #define LTSSM_EN_VAL		        BIT(0)
-#define LTSSM_STATE_MASK		0x1f
-#define LTSSM_STATE_L0			0x11
 #define DBI_CS2				BIT(5)
 #define OB_XLAT_EN_VAL		        BIT(1)
 
@@ -87,9 +85,6 @@
 
 #define OB_OFFSET_HI(n)			(0x204 + (8 * (n)))
 
-/* Config space registers */
-#define DEBUG0				0x728
-
 /* PCIE controller device IDs */
 #define PCIE_RC_K2HK		0xb008
 #define PCIE_RC_K2E		0xb009
@@ -308,8 +303,9 @@ static int ks_pcie_link_up(struct dw_pcie *pci)
 {
 	u32 val;
 
-	val = dw_pcie_readl_dbi(pci, DEBUG0);
-	return (val & LTSSM_STATE_MASK) == LTSSM_STATE_L0;
+	val = dw_pcie_readl_dbi(pci, PCIE_PORT_DEBUG0);
+	val &= PORT_LOGIC_LTSSM_STATE_MASK;
+	return (val == PORT_LOGIC_LTSSM_STATE_L0);
 }
 
 static void ks_pcie_quirk(struct pci_dev *dev)
diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index 96126fd8403c..a4d939536faf 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -37,6 +37,10 @@
 #define PORT_LINK_MODE_4_LANES		(0x7 << 16)
 #define PORT_LINK_MODE_8_LANES		(0xf << 16)
 
+#define PCIE_PORT_DEBUG0		0x728
+#define PORT_LOGIC_LTSSM_STATE_MASK	0x1f
+#define PORT_LOGIC_LTSSM_STATE_L0	0x11
+
 #define PCIE_LINK_WIDTH_SPEED_CONTROL	0x80C
 #define PORT_LOGIC_SPEED_CHANGE		(0x1 << 17)
 #define PORT_LOGIC_LINK_WIDTH_MASK	(0x1f << 8)
-- 
2.17.1