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Date: Fri, 21 Sep 2018 15:51:21 +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 06/40] PCI: keystone: Add start_link/stop_link dw_pcie_ops
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@...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
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