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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 06/40] PCI: keystone: Add start_link/stop_link dw_pcie_ops
Date: Fri, 21 Sep 2018 15:51:21 +0530	[thread overview]
Message-ID: <20180921102155.22839-7-kishon@ti.com> (raw)
In-Reply-To: <20180921102155.22839-1-kishon@ti.com>

Add start_link/stop_link dw_pcie_ops and invoke ks_pcie_start_link
directly from host_init. This will also be required for adding EP
support.

While at that also use BIT() for LTSSM_EN_VAL.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
---
 drivers/pci/controller/dwc/pci-keystone-dw.c |  9 +++-
 drivers/pci/controller/dwc/pci-keystone.c    | 51 +++++++++++---------
 drivers/pci/controller/dwc/pci-keystone.h    |  3 +-
 3 files changed, 38 insertions(+), 25 deletions(-)

diff --git a/drivers/pci/controller/dwc/pci-keystone-dw.c b/drivers/pci/controller/dwc/pci-keystone-dw.c
index 4bd6c6e2b177..ce399232cd99 100644
--- a/drivers/pci/controller/dwc/pci-keystone-dw.c
+++ b/drivers/pci/controller/dwc/pci-keystone-dw.c
@@ -21,7 +21,7 @@
 #include "pci-keystone.h"
 
 /* Application register defines */
-#define LTSSM_EN_VAL		        1
+#define LTSSM_EN_VAL		        BIT(0)
 #define LTSSM_STATE_MASK		0x1f
 #define LTSSM_STATE_L0			0x11
 #define DBI_CS2_EN_VAL			0x20
@@ -418,7 +418,7 @@ int ks_dw_pcie_link_up(struct dw_pcie *pci)
 	return (val & LTSSM_STATE_MASK) == LTSSM_STATE_L0;
 }
 
-void ks_dw_pcie_initiate_link_train(struct keystone_pcie *ks_pcie)
+void ks_dw_pcie_stop_link(struct keystone_pcie *ks_pcie)
 {
 	u32 val;
 
@@ -426,6 +426,11 @@ void ks_dw_pcie_initiate_link_train(struct keystone_pcie *ks_pcie)
 	val = ks_dw_app_readl(ks_pcie, CMD_STATUS);
 	val &= ~LTSSM_EN_VAL;
 	ks_dw_app_writel(ks_pcie, CMD_STATUS, LTSSM_EN_VAL | val);
+}
+
+void ks_dw_pcie_start_link(struct keystone_pcie *ks_pcie)
+{
+	u32 val;
 
 	/* Initiate Link Training */
 	val = ks_dw_app_readl(ks_pcie, CMD_STATUS);
diff --git a/drivers/pci/controller/dwc/pci-keystone.c b/drivers/pci/controller/dwc/pci-keystone.c
index f87ade2de711..24afc691443b 100644
--- a/drivers/pci/controller/dwc/pci-keystone.c
+++ b/drivers/pci/controller/dwc/pci-keystone.c
@@ -40,6 +40,9 @@
 
 #define to_keystone_pcie(x)	dev_get_drvdata((x)->dev)
 
+static int ks_pcie_start_link(struct dw_pcie *pci);
+static void ks_pcie_stop_link(struct dw_pcie *pci);
+
 static void quirk_limit_mrrs(struct pci_dev *dev)
 {
 	struct pci_bus *bus = dev->bus;
@@ -83,26 +86,6 @@ static void quirk_limit_mrrs(struct pci_dev *dev)
 }
 DECLARE_PCI_FIXUP_ENABLE(PCI_ANY_ID, PCI_ANY_ID, quirk_limit_mrrs);
 
-static int ks_pcie_establish_link(struct keystone_pcie *ks_pcie)
-{
-	struct dw_pcie *pci = ks_pcie->pci;
-	struct device *dev = pci->dev;
-
-	if (dw_pcie_link_up(pci)) {
-		dev_info(dev, "Link already up\n");
-		return 0;
-	}
-
-	ks_dw_pcie_initiate_link_train(ks_pcie);
-
-	/* check if the link is up or not */
-	if (!dw_pcie_wait_for_link(pci))
-		return 0;
-
-	dev_err(dev, "phy link never came up\n");
-	return -ETIMEDOUT;
-}
-
 static void ks_pcie_msi_irq_handler(struct irq_desc *desc)
 {
 	unsigned int irq = irq_desc_get_irq(desc);
@@ -263,7 +246,6 @@ static int __init ks_pcie_host_init(struct pcie_port *pp)
 
 	dw_pcie_setup_rc(pp);
 
-	ks_pcie_establish_link(ks_pcie);
 	ks_dw_pcie_setup_rc_app_regs(ks_pcie);
 	ks_pcie_setup_interrupts(ks_pcie);
 	writew(PCI_IO_RANGE_TYPE_32 | (PCI_IO_RANGE_TYPE_32 << 8),
@@ -279,7 +261,8 @@ static int __init ks_pcie_host_init(struct pcie_port *pp)
 	hook_fault_code(17, keystone_pcie_fault, SIGBUS, 0,
 			"Asynchronous external abort");
 
-	return 0;
+	ks_pcie_start_link(pci);
+	return dw_pcie_wait_for_link(pci);
 }
 
 static const struct dw_pcie_host_ops keystone_pcie_host_ops = {
@@ -358,7 +341,31 @@ static const struct of_device_id ks_pcie_of_match[] = {
 	{ },
 };
 
+static int ks_pcie_start_link(struct dw_pcie *pci)
+{
+	struct device *dev = pci->dev;
+	struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);
+
+	if (dw_pcie_link_up(pci)) {
+		dev_WARN(dev, "Link already up\n");
+		return 0;
+	}
+
+	ks_dw_pcie_start_link(ks_pcie);
+
+	return 0;
+}
+
+static void ks_pcie_stop_link(struct dw_pcie *pci)
+{
+	struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);
+
+	ks_dw_pcie_stop_link(ks_pcie);
+}
+
 static const struct dw_pcie_ops dw_pcie_ops = {
+	.start_link = ks_pcie_start_link,
+	.stop_link = ks_pcie_stop_link,
 	.link_up = ks_dw_pcie_link_up,
 };
 
diff --git a/drivers/pci/controller/dwc/pci-keystone.h b/drivers/pci/controller/dwc/pci-keystone.h
index 4eacc263f157..a66deab626aa 100644
--- a/drivers/pci/controller/dwc/pci-keystone.h
+++ b/drivers/pci/controller/dwc/pci-keystone.h
@@ -47,7 +47,8 @@ int ks_dw_pcie_wr_other_conf(struct pcie_port *pp, struct pci_bus *bus,
 int ks_dw_pcie_rd_other_conf(struct pcie_port *pp, struct pci_bus *bus,
 		unsigned int devfn, int where, int size, u32 *val);
 void ks_dw_pcie_setup_rc_app_regs(struct keystone_pcie *ks_pcie);
-void ks_dw_pcie_initiate_link_train(struct keystone_pcie *ks_pcie);
+void ks_dw_pcie_start_link(struct keystone_pcie *ks_pcie);
+void ks_dw_pcie_stop_link(struct keystone_pcie *ks_pcie);
 void ks_dw_pcie_msi_irq_ack(int i, struct pcie_port *pp);
 void ks_dw_pcie_msi_set_irq(struct pcie_port *pp, int irq);
 void ks_dw_pcie_msi_clear_irq(struct pcie_port *pp, int irq);
-- 
2.17.1


  parent reply	other threads:[~2018-09-21 10:23 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 ` Kishon Vijay Abraham I [this message]
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 ` [RFC PATCH 17/40] PCI: keystone: Cleanup configuration space access Kishon Vijay Abraham I
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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