[PATCH v5 0/5] Add Keystone PCIe controller driver

[PATCH v5 0/5] Add Keystone PCIe controller driver

[Murali Karicheri]

This patch series add PCIe controller driver for keystone SoCs. This is
based on v4 of the series posted to the mailing list. Keystone PCI controller
is based on version 3.65 of the DW hardware. This driver uses the DW core
functions to implement the PCI controller driver for keystone.

Testing:
=======

Testing of the driver is done on TI's K2HK EVM inserted to a Elma blu!eco
MicroTCA chassis AMC slot with JumpGen SEM-200 AMC SATA Storage and Dual
Ethernet Card Express inserted on another AMC slot. The e1000e driver available
on intel's website is patched to the kernel source tree and build. e1000e.ko
is dynamically loaded and executed ping and iperf tests to test the
functionality.

Thanks to all of you who have contributed by reviewing and offering valuable
comments. If you want me to add your "Reviewed-by", please let me know so that
I can add it to the commit log and re-send. I am still missing some mandatory
acked-by from maintainers (from the designware against 3/5 and DT maintainers
against 4/5). If you can provide them at the earliest, it will be appreciated.

Thanks

Signed-off-by: Murali Karicheri <m-karicheri2@ti.com>

CC: Russell King <linux@arm.linux.org.uk>
CC: Grant Likely <grant.likely@linaro.org>
CC: Rob Herring <robh+dt@kernel.org>
CC: Mohit Kumar <mohit.kumar@st.com>
CC: Jingoo Han <jg1.han@samsung.com>
CC: Bjorn Helgaas <bhelgaas@google.com>
CC: Pratyush Anand <pratyush.anand@st.com>
CC: Richard Zhu <r65037@freescale.com>
CC: Kishon Vijay Abraham I <kishon@ti.com>
CC: Marek Vasut <marex@denx.de>
CC: Arnd Bergmann <arnd@arndb.de>
CC: Pawel Moll <pawel.moll@arm.com>
CC: Mark Rutland <mark.rutland@arm.com>
CC: Ian Campbell <ijc+devicetree@hellion.org.uk>
CC: Kumar Gala <galak@codeaurora.org>
CC: Randy Dunlap <rdunlap@infradead.org>
CC: Grant Likely <grant.likely@linaro.org>

Changelog:

v5
 - Rebased to upstream kernel v3.16-rc5
 - Reworked Patch 3/6 and 4/6 into a single patch based on
   maintainer comment to use a API callback model to support
   the v3.65 h/w.
v4
 - Addressed comments against 5/5.
 - Added a patch 6/6 for Maintainer information
 - Added couple of Acked-By:
 - Rebased to latest Linux 3.16-rc4
v3
 - DW application register handling code is now part of
   Keystone PCI driver. RFC had this code part of Keystone
   PCI driver, then V1 moved this to a separate file to
   re-use on other platforms that uses this version of the
   DW h/w. Then based on comments against v2, this is moved
   back to Keystone driver.
 - Keystone SerDes phy driver is removed from this series so that
   this can be merged independent of that patch
 - added msi_set_irq()/clear_irq() API's to support Keystone

V2
 - Split the designware pcie enhancement patch to multiple
   patches based on functionality added
 - Remove the quirk code and add a patch to fix mps/mrss
   tuning for ARM. Use kernel command line parameter
   pci=pcie_bus_perf to work with Keystone PCI Controller.
   Following patch addressed this.
     [PATCH v1] ARM: pci: add call to pcie_bus_configure_settings()
 - Add documentation for device tree bindings
 - Add separate interrupt controller nodes for MSI and Legacy
   IRQs and use irq map for legacy IRQ
 - Use compatibility to identify v3.65 version of the DW hardware
   and use it to customize the designware common code.
 - Use reg property for configuration space instead of range
 - Other minor updates based on code inspection. 

V1
 - Add an interrupt controller node for Legacy irq chip and use
   interrupt map/map-mask property to map legacy IRQs A/B/C/D
 - Add a Phy driver to replace the original serdes driver
 - Move common application register handling code to a separate
   file to allow re-use across other platforms that use older
   DW PCIe h/w
 - PCI quirk for maximum read request size. Check and override only
   if the maximum is higher than what controller can handle.
 - Converted to a module platform driver.

Murali Karicheri (5):
  PCI: designware: add rd[wr]_other_conf API
  PCI: designware: refactor MSI code to work with v3.65 dw hardware
  PCI: designware: enhance dw_pcie_host_init() to support v3.65 DW
    hardware
  PCI: add PCI controller for keystone PCIe h/w
  PCI: keystone: Update maintainer information

 .../devicetree/bindings/pci/pci-keystone.txt       |   71 +++
 MAINTAINERS                                        |    7 +
 drivers/pci/host/Kconfig                           |    5 +
 drivers/pci/host/Makefile                          |    1 +
 drivers/pci/host/pci-keystone-dw.c                 |  516 ++++++++++++++++++++
 drivers/pci/host/pci-keystone.c                    |  385 +++++++++++++++
 drivers/pci/host/pci-keystone.h                    |   59 +++
 drivers/pci/host/pcie-designware.c                 |  118 +++--
 drivers/pci/host/pcie-designware.h                 |    9 +
 9 files changed, 1134 insertions(+), 37 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/pci/pci-keystone.txt
 create mode 100644 drivers/pci/host/pci-keystone-dw.c
 create mode 100644 drivers/pci/host/pci-keystone.c
 create mode 100644 drivers/pci/host/pci-keystone.h

-- 
1.7.9.5

[PATCH v5 1/5] PCI: designware: add rd[wr]_other_conf API

[Murali Karicheri]

v3.65 version of the designware h/w, requires application space
registers to be configured to access the remote EP config space.
To support this, add rd[wr]_other_conf API in the pcie_host_opts

Signed-off-by: Murali Karicheri <m-karicheri2@ti.com>
Acked-by: Mohit Kumar <mohit.kumar@st.com>
Acked-by: Jingoo Han <jg1.han@samsung.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>

CC: Russell King <linux@arm.linux.org.uk>
CC: Grant Likely <grant.likely@linaro.org>
CC: Rob Herring <robh+dt@kernel.org>
CC: Bjorn Helgaas <bhelgaas@google.com>
CC: Pratyush Anand <pratyush.anand@st.com>
CC: Richard Zhu <r65037@freescale.com>
CC: Kishon Vijay Abraham I <kishon@ti.com>
CC: Marek Vasut <marex@denx.de>
CC: Arnd Bergmann <arnd@arndb.de>
CC: Pawel Moll <pawel.moll@arm.com>
CC: Mark Rutland <mark.rutland@arm.com>
CC: Ian Campbell <ijc+devicetree@hellion.org.uk>
CC: Kumar Gala <galak@codeaurora.org>
CC: Randy Dunlap <rdunlap@infradead.org>
CC: Grant Likely <grant.likely@linaro.org> 
---
 drivers/pci/host/pcie-designware.c |   12 ++++++++++--
 drivers/pci/host/pcie-designware.h |    4 ++++
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c
index 1eaf4df..d8f3af7 100644
--- a/drivers/pci/host/pcie-designware.c
+++ b/drivers/pci/host/pcie-designware.c
@@ -656,7 +656,11 @@ static int dw_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
 	}
 
 	if (bus->number != pp->root_bus_nr)
-		ret = dw_pcie_rd_other_conf(pp, bus, devfn,
+		if (pp->ops->rd_other_conf)
+			ret = pp->ops->rd_other_conf(pp, bus, devfn,
+						where, size, val);
+		else
+			ret = dw_pcie_rd_other_conf(pp, bus, devfn,
 						where, size, val);
 	else
 		ret = dw_pcie_rd_own_conf(pp, where, size, val);
@@ -679,7 +683,11 @@ static int dw_pcie_wr_conf(struct pci_bus *bus, u32 devfn,
 		return PCIBIOS_DEVICE_NOT_FOUND;
 
 	if (bus->number != pp->root_bus_nr)
-		ret = dw_pcie_wr_other_conf(pp, bus, devfn,
+		if (pp->ops->wr_other_conf)
+			ret = pp->ops->wr_other_conf(pp, bus, devfn,
+						where, size, val);
+		else
+			ret = dw_pcie_wr_other_conf(pp, bus, devfn,
 						where, size, val);
 	else
 		ret = dw_pcie_wr_own_conf(pp, where, size, val);
diff --git a/drivers/pci/host/pcie-designware.h b/drivers/pci/host/pcie-designware.h
index 77f592f..8121901 100644
--- a/drivers/pci/host/pcie-designware.h
+++ b/drivers/pci/host/pcie-designware.h
@@ -61,6 +61,10 @@ struct pcie_host_ops {
 			u32 val, void __iomem *dbi_base);
 	int (*rd_own_conf)(struct pcie_port *pp, int where, int size, u32 *val);
 	int (*wr_own_conf)(struct pcie_port *pp, int where, int size, u32 val);
+	int (*rd_other_conf)(struct pcie_port *pp, struct pci_bus *bus,
+			unsigned int devfn, int where, int size, u32 *val);
+	int (*wr_other_conf)(struct pcie_port *pp, struct pci_bus *bus,
+			unsigned int devfn, int where, int size, u32 val);
 	int (*link_up)(struct pcie_port *pp);
 	void (*host_init)(struct pcie_port *pp);
 };
-- 
1.7.9.5

[PATCH v5 2/5] PCI: designware: refactor MSI code to work with v3.65 dw hardware

[Murali Karicheri]

Keystone PCI controller is based on v3.65 version of the DW
PCI h/w that implements MSI controller registers in application
space compared to the newer version. This requires updates to
the DW core API to support the PCI controller driver based on
this old DW hardware. Add msi_irq_set()/clear() API functions to
allow Set/Clear MSI IRQ enable bit in the application register.
Also the old h/w uses MSI_IRQ register in application register
space to raise MSI IRQ to the RC from EP. Current code uses the
standard mechanism as per PCI spec. So add another API get_msi_data()
to get the address of this register so that common code can be
re-used on old h/w.

Signed-off-by: Murali Karicheri <m-karicheri2@ti.com>
Acked-by: Mohit Kumar <mohit.kumar@st.com>
Acked-by: Jingoo Han <jg1.han@samsung.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>

CC: Russell King <linux@arm.linux.org.uk>
CC: Grant Likely <grant.likely@linaro.org>
CC: Rob Herring <robh+dt@kernel.org>
CC: Bjorn Helgaas <bhelgaas@google.com>
CC: Pratyush Anand <pratyush.anand@st.com>
CC: Richard Zhu <r65037@freescale.com>
CC: Kishon Vijay Abraham I <kishon@ti.com>
CC: Marek Vasut <marex@denx.de>
CC: Arnd Bergmann <arnd@arndb.de>
CC: Pawel Moll <pawel.moll@arm.com>
CC: Mark Rutland <mark.rutland@arm.com>
CC: Ian Campbell <ijc+devicetree@hellion.org.uk>
CC: Kumar Gala <galak@codeaurora.org>
CC: Randy Dunlap <rdunlap@infradead.org>
CC: Grant Likely <grant.likely@linaro.org>
---
 drivers/pci/host/pcie-designware.c |   50 ++++++++++++++++++++++++++----------
 drivers/pci/host/pcie-designware.h |    3 +++
 2 files changed, 39 insertions(+), 14 deletions(-)

diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c
index d8f3af7..905941c 100644
--- a/drivers/pci/host/pcie-designware.c
+++ b/drivers/pci/host/pcie-designware.c
@@ -217,27 +217,47 @@ static int find_valid_pos0(struct pcie_port *pp, int msgvec, int pos, int *pos0)
 	return 0;
 }
 
+static void dw_pcie_msi_clear_irq(struct pcie_port *pp, int irq)
+{
+	unsigned int res, bit, val;
+
+	res = (irq / 32) * 12;
+	bit = irq % 32;
+	dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4, &val);
+	val &= ~(1 << bit);
+	dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4, val);
+}
+
 static void clear_irq_range(struct pcie_port *pp, unsigned int irq_base,
 			    unsigned int nvec, unsigned int pos)
 {
-	unsigned int i, res, bit, val;
+	unsigned int i;
 
 	for (i = 0; i < nvec; i++) {
 		irq_set_msi_desc_off(irq_base, i, NULL);
 		clear_bit(pos + i, pp->msi_irq_in_use);
 		/* Disable corresponding interrupt on MSI controller */
-		res = ((pos + i) / 32) * 12;
-		bit = (pos + i) % 32;
-		dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4, &val);
-		val &= ~(1 << bit);
-		dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4, val);
+		if (pp->ops->msi_clear_irq)
+			pp->ops->msi_clear_irq(pp, pos + i);
+		else
+			dw_pcie_msi_clear_irq(pp, pos + i);
 	}
 }
 
+static void dw_pcie_msi_set_irq(struct pcie_port *pp, int irq)
+{
+	unsigned int res, bit, val;
+
+	res = (irq / 32) * 12;
+	bit = irq % 32;
+	dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4, &val);
+	val |= 1 << bit;
+	dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4, val);
+}
+
 static int assign_irq(int no_irqs, struct msi_desc *desc, int *pos)
 {
-	int res, bit, irq, pos0, pos1, i;
-	u32 val;
+	int irq, pos0, pos1, i;
 	struct pcie_port *pp = sys_to_pcie(desc->dev->bus->sysdata);
 
 	if (!pp) {
@@ -281,11 +301,10 @@ static int assign_irq(int no_irqs, struct msi_desc *desc, int *pos)
 		}
 		set_bit(pos0 + i, pp->msi_irq_in_use);
 		/*Enable corresponding interrupt in MSI interrupt controller */
-		res = ((pos0 + i) / 32) * 12;
-		bit = (pos0 + i) % 32;
-		dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4, &val);
-		val |= 1 << bit;
-		dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4, val);
+		if (pp->ops->msi_set_irq)
+			pp->ops->msi_set_irq(pp, pos0 + i);
+		else
+			dw_pcie_msi_set_irq(pp, pos0 + i);
 	}
 
 	*pos = pos0;
@@ -353,7 +372,10 @@ static int dw_msi_setup_irq(struct msi_chip *chip, struct pci_dev *pdev,
 	 */
 	desc->msi_attrib.multiple = msgvec;
 
-	msg.address_lo = virt_to_phys((void *)pp->msi_data);
+	if (pp->ops->get_msi_data)
+		msg.address_lo = pp->ops->get_msi_data(pp);
+	else
+		msg.address_lo = virt_to_phys((void *)pp->msi_data);
 	msg.address_hi = 0x0;
 	msg.data = pos;
 	write_msi_msg(irq, &msg);
diff --git a/drivers/pci/host/pcie-designware.h b/drivers/pci/host/pcie-designware.h
index 8121901..387f69e 100644
--- a/drivers/pci/host/pcie-designware.h
+++ b/drivers/pci/host/pcie-designware.h
@@ -67,6 +67,9 @@ struct pcie_host_ops {
 			unsigned int devfn, int where, int size, u32 val);
 	int (*link_up)(struct pcie_port *pp);
 	void (*host_init)(struct pcie_port *pp);
+	void (*msi_set_irq)(struct pcie_port *pp, int irq);
+	void (*msi_clear_irq)(struct pcie_port *pp, int irq);
+	u32 (*get_msi_data)(struct pcie_port *pp);
 };
 
 int dw_pcie_cfg_read(void __iomem *addr, int where, int size, u32 *val);
-- 
1.7.9.5

[PATCH v5 3/5] PCI: designware: enhance dw_pcie_host_init() to support v3.65 DW hardware

[Murali Karicheri]

keystone PCI controller is based on v3.65 designware hardware. This
version differs from newer versions of the hardware in few functional
areas discussed below that makes it necessary to change dw_pcie_host_init()
to support v3.65 based PCI controller.

 1. No support for ATU port. So any ATU specific resource handling code
    is to be bypassed for v3.65 h/w.
 2. MSI controller uses Application space to implement MSI and 32 MSI
    interrupts are multiplexed over 8 IRQs to the host. Hence the code
    to process MSI IRQ needs to be different. This patch allows platform
    driver to provide its own irq_domain_ops ptr to irq_domain_add_linear()
    through an API callback from the designware core driver.
 3. MSI interrupt generation requires EP to write to the RC's application
    register. So enhance the driver to allow setup of inbound access to
    MSI irq register as a post scan bus API callback.

Signed-off-by: Murali Karicheri <m-karicheri2@ti.com>

CC: Santosh Shilimkar <santosh.shilimkar@ti.com>
CC: Russell King <linux@arm.linux.org.uk>
CC: Grant Likely <grant.likely@linaro.org>
CC: Rob Herring <robh+dt@kernel.org>
CC: Mohit Kumar <mohit.kumar@st.com>
CC: Jingoo Han <jg1.han@samsung.com>
CC: Bjorn Helgaas <bhelgaas@google.com>
CC: Pratyush Anand <pratyush.anand@st.com>
CC: Richard Zhu <r65037@freescale.com>
CC: Kishon Vijay Abraham I <kishon@ti.com>
CC: Marek Vasut <marex@denx.de>
CC: Arnd Bergmann <arnd@arndb.de>
CC: Pawel Moll <pawel.moll@arm.com>
CC: Mark Rutland <mark.rutland@arm.com>
CC: Ian Campbell <ijc+devicetree@hellion.org.uk>
CC: Kumar Gala <galak@codeaurora.org>
CC: Randy Dunlap <rdunlap@infradead.org>
CC: Grant Likely <grant.likely@linaro.org>
---
 drivers/pci/host/pcie-designware.c |   56 ++++++++++++++++++++++--------------
 drivers/pci/host/pcie-designware.h |    2 ++
 2 files changed, 37 insertions(+), 21 deletions(-)

diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c
index 905941c..e164fde 100644
--- a/drivers/pci/host/pcie-designware.c
+++ b/drivers/pci/host/pcie-designware.c
@@ -418,10 +418,10 @@ static const struct irq_domain_ops msi_domain_ops = {
 int __init dw_pcie_host_init(struct pcie_port *pp)
 {
 	struct device_node *np = pp->dev->of_node;
-	struct of_pci_range range;
 	struct of_pci_range_parser parser;
+	struct of_pci_range range;
+	int i, ret;
 	u32 val;
-	int i;
 
 	if (of_pci_range_parser_init(&parser, np)) {
 		dev_err(pp->dev, "missing ranges property\n");
@@ -467,21 +467,26 @@ int __init dw_pcie_host_init(struct pcie_port *pp)
 		}
 	}
 
-	pp->cfg0_base = pp->cfg.start;
-	pp->cfg1_base = pp->cfg.start + pp->config.cfg0_size;
 	pp->mem_base = pp->mem.start;
 
-	pp->va_cfg0_base = devm_ioremap(pp->dev, pp->cfg0_base,
-					pp->config.cfg0_size);
 	if (!pp->va_cfg0_base) {
-		dev_err(pp->dev, "error with ioremap in function\n");
-		return -ENOMEM;
+		pp->cfg0_base = pp->cfg.start;
+		pp->va_cfg0_base = devm_ioremap(pp->dev, pp->cfg0_base,
+						pp->config.cfg0_size);
+		if (!pp->va_cfg0_base) {
+			dev_err(pp->dev, "error with ioremap in function\n");
+			return -ENOMEM;
+		}
 	}
-	pp->va_cfg1_base = devm_ioremap(pp->dev, pp->cfg1_base,
-					pp->config.cfg1_size);
+
 	if (!pp->va_cfg1_base) {
-		dev_err(pp->dev, "error with ioremap\n");
-		return -ENOMEM;
+		pp->cfg1_base = pp->cfg.start + pp->config.cfg0_size;
+		pp->va_cfg1_base = devm_ioremap(pp->dev, pp->cfg1_base,
+						pp->config.cfg1_size);
+		if (!pp->va_cfg1_base) {
+			dev_err(pp->dev, "error with ioremap\n");
+			return -ENOMEM;
+		}
 	}
 
 	if (of_property_read_u32(np, "num-lanes", &pp->lanes)) {
@@ -490,16 +495,22 @@ int __init dw_pcie_host_init(struct pcie_port *pp)
 	}
 
 	if (IS_ENABLED(CONFIG_PCI_MSI)) {
-		pp->irq_domain = irq_domain_add_linear(pp->dev->of_node,
-					MAX_MSI_IRQS, &msi_domain_ops,
-					&dw_pcie_msi_chip);
-		if (!pp->irq_domain) {
-			dev_err(pp->dev, "irq domain init failed\n");
-			return -ENXIO;
-		}
+		if (!pp->ops->msi_host_init) {
+			pp->irq_domain = irq_domain_add_linear(pp->dev->of_node,
+						MAX_MSI_IRQS, &msi_domain_ops,
+						&dw_pcie_msi_chip);
+			if (!pp->irq_domain) {
+				dev_err(pp->dev, "irq domain init failed\n");
+				return -ENXIO;
+			}
 
-		for (i = 0; i < MAX_MSI_IRQS; i++)
-			irq_create_mapping(pp->irq_domain, i);
+			for (i = 0; i < MAX_MSI_IRQS; i++)
+				irq_create_mapping(pp->irq_domain, i);
+		} else {
+			ret = pp->ops->msi_host_init(pp, &dw_pcie_msi_chip);
+			if (ret < 0)
+				return ret;
+		}
 	}
 
 	if (pp->ops->host_init)
@@ -759,6 +770,9 @@ static struct pci_bus *dw_pcie_scan_bus(int nr, struct pci_sys_data *sys)
 		BUG();
 	}
 
+	if (bus && pp->ops->scan_bus)
+		pp->ops->scan_bus(pp);
+
 	return bus;
 }
 
diff --git a/drivers/pci/host/pcie-designware.h b/drivers/pci/host/pcie-designware.h
index 387f69e..080c649 100644
--- a/drivers/pci/host/pcie-designware.h
+++ b/drivers/pci/host/pcie-designware.h
@@ -70,6 +70,8 @@ struct pcie_host_ops {
 	void (*msi_set_irq)(struct pcie_port *pp, int irq);
 	void (*msi_clear_irq)(struct pcie_port *pp, int irq);
 	u32 (*get_msi_data)(struct pcie_port *pp);
+	void (*scan_bus)(struct pcie_port *pp);
+	int (*msi_host_init)(struct pcie_port *pp, struct msi_chip *chip);
 };
 
 int dw_pcie_cfg_read(void __iomem *addr, int where, int size, u32 *val);
-- 
1.7.9.5

[PATCH v5 4/5] PCI: add PCI controller for keystone PCIe h/w

[Murali Karicheri]

keystone PCIe controller is based on v3.65 version of the
designware h/w. Main differences are
	1. No ATU support
	2. Legacy and MSI irq functions are implemented in
	   application register space
	3. MSI interrupts are multiplexed over 8 IRQ lines to the Host
	   side.
All of the Application register space handing code are organized into
pci-keystone-dw.c and the functions are called from pci-keystone.c
to implement PCI controller driver. Also add necessary DT documentation
for the driver.

Signed-off-by: Murali Karicheri <m-karicheri2@ti.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>

CC: Russell King <linux@arm.linux.org.uk>
CC: Grant Likely <grant.likely@linaro.org>
CC: Rob Herring <robh+dt@kernel.org>
CC: Mohit Kumar <mohit.kumar@st.com>
CC: Jingoo Han <jg1.han@samsung.com>
CC: Bjorn Helgaas <bhelgaas@google.com>
CC: Pratyush Anand <pratyush.anand@st.com>
CC: Richard Zhu <r65037@freescale.com>
CC: Kishon Vijay Abraham I <kishon@ti.com>
CC: Marek Vasut <marex@denx.de>
CC: Arnd Bergmann <arnd@arndb.de>
CC: Pawel Moll <pawel.moll@arm.com>
CC: Mark Rutland <mark.rutland@arm.com>
CC: Ian Campbell <ijc+devicetree@hellion.org.uk>
CC: Kumar Gala <galak@codeaurora.org>
CC: Randy Dunlap <rdunlap@infradead.org>
CC: Grant Likely <grant.likely@linaro.org>
---
 .../devicetree/bindings/pci/pci-keystone.txt       |   71 +++
 drivers/pci/host/Kconfig                           |    5 +
 drivers/pci/host/Makefile                          |    1 +
 drivers/pci/host/pci-keystone-dw.c                 |  516 ++++++++++++++++++++
 drivers/pci/host/pci-keystone.c                    |  385 +++++++++++++++
 drivers/pci/host/pci-keystone.h                    |   59 +++
 6 files changed, 1037 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pci/pci-keystone.txt
 create mode 100644 drivers/pci/host/pci-keystone-dw.c
 create mode 100644 drivers/pci/host/pci-keystone.c
 create mode 100644 drivers/pci/host/pci-keystone.h

diff --git a/Documentation/devicetree/bindings/pci/pci-keystone.txt b/Documentation/devicetree/bindings/pci/pci-keystone.txt
new file mode 100644
index 0000000..9c96164
--- /dev/null
+++ b/Documentation/devicetree/bindings/pci/pci-keystone.txt
@@ -0,0 +1,71 @@
+TI Keystone PCIe interface
+
+Keystone PCI host Controller is based on Designware PCI h/w version 3.65.
+It shares common functions with PCIE Designware core driver and inherit
+common properties defined in
+Documentation/devicetree/bindings/pci/designware-pci.txt
+
+Please refer to Documentation/devicetree/bindings/pci/designware-pci.txt
+for the details of designware DT bindings. Additional properties are
+described here as well propeties that are not applicable.
+
+Required Properties:-
+
+compatibility: "ti,keystone-pcie"
+reg:	index 1 is the base address and length of DW application registers.
+	index 2 is the base address and length of PCI mode configuration
+	register.
+	index 3 is the base address and length of PCI device ID register.
+
+pcie_msi_intc : Interrupt controller device node for MSI irq chip
+	interrupt-cells: should be set to 1
+	interrupt-parent: Parent interrupt controller phandle
+	interrupts: GIC interrupt lines connected to PCI MSI interrupt lines
+
+ Example:
+	pcie_msi_intc: msi-interrupt-controller {
+			interrupt-controller;
+			#interrupt-cells = <1>;
+			interrupt-parent = <&gic>;
+			interrupts = <GIC_SPI 30 IRQ_TYPE_EDGE_RISING>,
+					<GIC_SPI 31 IRQ_TYPE_EDGE_RISING>,
+					<GIC_SPI 32 IRQ_TYPE_EDGE_RISING>,
+					<GIC_SPI 33 IRQ_TYPE_EDGE_RISING>,
+					<GIC_SPI 34 IRQ_TYPE_EDGE_RISING>,
+					<GIC_SPI 35 IRQ_TYPE_EDGE_RISING>,
+					<GIC_SPI 36 IRQ_TYPE_EDGE_RISING>,
+					<GIC_SPI 37 IRQ_TYPE_EDGE_RISING>;
+	};
+
+pcie_intc: Interrupt controller device node for Legacy irq chip
+	interrupt-cells: should be set to 1
+	interrupt-parent: Parent interrupt controller phandle
+	interrupts: GIC interrupt lines connected to PCI Legacy interrupt lines
+
+ Example:
+	pcie_intc: legacy-interrupt-controller {
+		interrupt-controller;
+		#interrupt-cells = <1>;
+		interrupt-parent = <&gic>;
+		interrupts = <GIC_SPI 26 IRQ_TYPE_EDGE_RISING>,
+			<GIC_SPI 27 IRQ_TYPE_EDGE_RISING>,
+			<GIC_SPI 28 IRQ_TYPE_EDGE_RISING>,
+			<GIC_SPI 29 IRQ_TYPE_EDGE_RISING>;
+	};
+
+Optional properties:-
+	phys: phandle to Generic Keystone SerDes phy for PCI
+	phy-names: name of the Generic Keystine SerDes phy for PCI
+	  - If boot loader already does PCI link establishment, then phys and
+	    phy-names shouldn't be present.
+	ti,enable-linktrain - Enable Link training.
+	  - If boot loader already does PCI link establishment, then this
+	    shouldn't be present.
+
+Designware DT Properties not applicable for Keystone PCI
+
+1. pcie_bus clock-names not used. Instead, a phandle to phys is used.
+
+Note for PCI driver usage
+=========================
+Driver requires pci=pcie_bus_perf in the bootargs for proper functioning.
diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig
index 21df477..f8bc475 100644
--- a/drivers/pci/host/Kconfig
+++ b/drivers/pci/host/Kconfig
@@ -46,4 +46,9 @@ config PCI_HOST_GENERIC
 	  Say Y here if you want to support a simple generic PCI host
 	  controller, such as the one emulated by kvmtool.
 
+config PCI_KEYSTONE
+	bool "TI Keystone PCIe controller"
+	depends on ARCH_KEYSTONE
+	select PCIE_DW
+	select PCIEPORTBUS
 endmenu
diff --git a/drivers/pci/host/Makefile b/drivers/pci/host/Makefile
index 611ba4b..d1b6ce1 100644
--- a/drivers/pci/host/Makefile
+++ b/drivers/pci/host/Makefile
@@ -6,3 +6,4 @@ obj-$(CONFIG_PCI_TEGRA) += pci-tegra.o
 obj-$(CONFIG_PCI_RCAR_GEN2) += pci-rcar-gen2.o
 obj-$(CONFIG_PCI_RCAR_GEN2_PCIE) += pcie-rcar.o
 obj-$(CONFIG_PCI_HOST_GENERIC) += pci-host-generic.o
+obj-$(CONFIG_PCI_KEYSTONE) += pci-keystone-dw.o pci-keystone.o
diff --git a/drivers/pci/host/pci-keystone-dw.c b/drivers/pci/host/pci-keystone-dw.c
new file mode 100644
index 0000000..b75582c
--- /dev/null
+++ b/drivers/pci/host/pci-keystone-dw.c
@@ -0,0 +1,516 @@
+/*
+ * Designware application register space functions for Keystone PCI controller
+ *
+ * Copyright (C) 2013-2014 Texas Instruments., Ltd.
+ *		http://www.ti.com
+ *
+ * Author: Murali Karicheri <m-karicheri2@ti.com>
+ *
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/irq.h>
+#include <linux/irqdomain.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_pci.h>
+#include <linux/pci.h>
+#include <linux/platform_device.h>
+
+#include "pcie-designware.h"
+#include "pci-keystone.h"
+
+/* Application register defines */
+#define LTSSM_EN_VAL		        1
+#define LTSSM_STATE_MASK		0x1f
+#define LTSSM_STATE_L0			0x11
+#define DBI_CS2_EN_VAL			0x20
+#define OB_XLAT_EN_VAL		        2
+
+/* Application registers */
+#define CMD_STATUS			0x004
+#define CFG_SETUP			0x008
+#define OB_SIZE				0x030
+#define CFG_PCIM_WIN_SZ_IDX		3
+#define CFG_PCIM_WIN_CNT		32
+#define SPACE0_REMOTE_CFG_OFFSET	0x1000
+#define OB_OFFSET_INDEX(n)		(0x200 + (8 * n))
+#define OB_OFFSET_HI(n)			(0x204 + (8 * n))
+
+/* IRQ register defines */
+#define IRQ_EOI				0x050
+#define IRQ_STATUS			0x184
+#define IRQ_ENABLE_SET			0x188
+#define IRQ_ENABLE_CLR			0x18c
+
+#define MSI_IRQ				0x054
+#define MSI0_IRQ_STATUS			0x104
+#define MSI0_IRQ_ENABLE_SET		0x108
+#define MSI0_IRQ_ENABLE_CLR		0x10c
+#define IRQ_STATUS			0x184
+#define MSI_IRQ_OFFSET			4
+
+/* Config space registers */
+#define DEBUG0				0x728
+
+#define to_keystone_pcie(x)	container_of(x, struct keystone_pcie, pp)
+
+static inline struct pcie_port *sys_to_pcie(struct pci_sys_data *sys)
+{
+	return sys->private_data;
+}
+
+static inline void update_reg_offset_bit_pos(u32 offset, u32 *reg_offset,
+					u32 *bit_pos)
+{
+	*reg_offset = offset % 8;
+	*bit_pos = offset >> 3;
+}
+
+u32 ks_dw_pcie_get_msi_data(struct pcie_port *pp)
+{
+	struct keystone_pcie *ks_pcie = to_keystone_pcie(pp);
+
+	return ks_pcie->app.start + MSI_IRQ;
+}
+
+void ks_dw_pcie_handle_msi_irq(struct keystone_pcie *ks_pcie , int offset)
+{
+	struct pcie_port *pp = &ks_pcie->pp;
+	u32 pending, vector;
+	int src, virq;
+
+	pending = readl(ks_pcie->va_app_base + MSI0_IRQ_STATUS + (offset << 4));
+	/*
+	 * MSI0, Status bit 0-3 shows vectors 0, 8, 16, 24, MSI1 status bit
+	 * shows 1, 9, 17, 25 and so forth
+	 */
+	for (src = 0; src < 4; src++) {
+		if (BIT(src) & pending) {
+			vector = offset + (src << 3);
+			virq = irq_linear_revmap(pp->irq_domain, vector);
+			dev_dbg(pp->dev,
+				"irq: bit %d, vector %d, virq %d\n",
+				 src, vector, virq);
+			generic_handle_irq(virq);
+		}
+	}
+}
+
+static void ks_dw_pcie_msi_irq_ack(struct irq_data *d)
+{
+	u32 offset, reg_offset, bit_pos;
+	struct keystone_pcie *ks_pcie;
+	unsigned int irq = d->irq;
+	struct msi_desc *msi;
+	struct pcie_port *pp;
+
+	msi = irq_get_msi_desc(irq);
+	pp = sys_to_pcie(msi->dev->bus->sysdata);
+	ks_pcie = to_keystone_pcie(pp);
+	offset = irq - irq_linear_revmap(pp->irq_domain, 0);
+	update_reg_offset_bit_pos(offset, &reg_offset, &bit_pos);
+
+	writel(BIT(bit_pos),
+		ks_pcie->va_app_base + MSI0_IRQ_STATUS + (reg_offset << 4));
+	writel(reg_offset + MSI_IRQ_OFFSET, ks_pcie->va_app_base + IRQ_EOI);
+}
+
+void ks_dw_pcie_msi_set_irq(struct pcie_port *pp, int irq)
+{
+	u32 reg_offset, bit_pos;
+	struct keystone_pcie *ks_pcie = to_keystone_pcie(pp);
+
+	update_reg_offset_bit_pos(irq, &reg_offset, &bit_pos);
+	writel(BIT(bit_pos),
+		ks_pcie->va_app_base + MSI0_IRQ_ENABLE_SET + (reg_offset << 4));
+}
+
+void ks_dw_pcie_msi_clear_irq(struct pcie_port *pp, int irq)
+{
+	u32 reg_offset, bit_pos;
+	struct keystone_pcie *ks_pcie = to_keystone_pcie(pp);
+
+	update_reg_offset_bit_pos(irq, &reg_offset, &bit_pos);
+	writel(BIT(bit_pos),
+		ks_pcie->va_app_base + MSI0_IRQ_ENABLE_CLR + (reg_offset << 4));
+}
+
+static void ks_dw_pcie_msi_irq_mask(struct irq_data *d)
+{
+	struct keystone_pcie *ks_pcie;
+	unsigned int irq = d->irq;
+	struct msi_desc *msi;
+	struct pcie_port *pp;
+	u32 offset;
+
+	msi = irq_get_msi_desc(irq);
+	pp = sys_to_pcie(msi->dev->bus->sysdata);
+	ks_pcie = to_keystone_pcie(pp);
+	offset = irq - irq_linear_revmap(pp->irq_domain, 0);
+
+	/* mask the end point if PVM implemented */
+	if (IS_ENABLED(CONFIG_PCI_MSI)) {
+		if (msi->msi_attrib.maskbit)
+			mask_msi_irq(d);
+	}
+
+	ks_dw_pcie_msi_clear_irq(pp, offset);
+}
+
+static void ks_dw_pcie_msi_irq_unmask(struct irq_data *d)
+{
+	struct keystone_pcie *ks_pcie;
+	unsigned int irq = d->irq;
+	struct msi_desc *msi;
+	struct pcie_port *pp;
+	u32 offset;
+
+	msi = irq_get_msi_desc(irq);
+	pp = sys_to_pcie(msi->dev->bus->sysdata);
+	ks_pcie = to_keystone_pcie(pp);
+	offset = irq - irq_linear_revmap(pp->irq_domain, 0);
+
+	/* mask the end point if PVM implemented */
+	if (IS_ENABLED(CONFIG_PCI_MSI)) {
+		if (msi->msi_attrib.maskbit)
+			unmask_msi_irq(d);
+	}
+
+	ks_dw_pcie_msi_set_irq(pp, offset);
+}
+
+static struct irq_chip ks_dw_pcie_msi_irq_chip = {
+	.name = "Keystone-PCIe-MSI-IRQ",
+	.irq_ack = ks_dw_pcie_msi_irq_ack,
+	.irq_mask = ks_dw_pcie_msi_irq_mask,
+	.irq_unmask = ks_dw_pcie_msi_irq_unmask,
+};
+
+static int ks_dw_pcie_msi_map(struct irq_domain *domain, unsigned int irq,
+			irq_hw_number_t hwirq)
+{
+	irq_set_chip_and_handler(irq, &ks_dw_pcie_msi_irq_chip,
+				 handle_level_irq);
+	irq_set_chip_data(irq, domain->host_data);
+	set_irq_flags(irq, IRQF_VALID);
+
+	return 0;
+}
+
+const struct irq_domain_ops ks_dw_pcie_msi_domain_ops = {
+	.map = ks_dw_pcie_msi_map,
+};
+
+int ks_dw_pcie_msi_host_init(struct pcie_port *pp,
+					struct msi_chip *chip)
+{
+	struct keystone_pcie *ks_pcie = to_keystone_pcie(pp);
+	int i;
+
+	pp->irq_domain = irq_domain_add_linear(ks_pcie->msi_intc_np,
+					MAX_MSI_IRQS,
+					&ks_dw_pcie_msi_domain_ops,
+					chip);
+	if (!pp->irq_domain) {
+		dev_err(pp->dev, "irq domain init failed\n");
+		return -ENXIO;
+	}
+
+	for (i = 0; i < MAX_MSI_IRQS; i++)
+		irq_create_mapping(pp->irq_domain, i);
+
+	return 0;
+}
+
+void ks_dw_pcie_enable_legacy_irqs(struct keystone_pcie *ks_pcie)
+{
+	int i;
+
+	for (i = 0; i < MAX_LEGACY_IRQS; i++)
+		writel(0x1, ks_pcie->va_app_base + IRQ_ENABLE_SET + (i << 4));
+}
+
+void ks_dw_pcie_handle_legacy_irq(struct keystone_pcie *ks_pcie, int offset)
+{
+	struct pcie_port *pp = &ks_pcie->pp;
+	u32 pending;
+	int virq;
+
+	pending = readl(ks_pcie->va_app_base + IRQ_STATUS + (offset << 4));
+
+	if (BIT(0) & pending) {
+		virq = irq_linear_revmap(ks_pcie->legacy_irq_domain, offset);
+		dev_dbg(pp->dev,
+			": irq: irq_offset %d, virq %d\n", offset, virq);
+		generic_handle_irq(virq);
+	}
+
+	/* EOI the INTx interrupt */
+	writel(offset, ks_pcie->va_app_base + IRQ_EOI);
+}
+
+static void ks_dw_pcie_ack_legacy_irq(struct irq_data *d)
+{
+}
+
+static void ks_dw_pcie_mask_legacy_irq(struct irq_data *d)
+{
+}
+
+static void ks_dw_pcie_unmask_legacy_irq(struct irq_data *d)
+{
+}
+
+static struct irq_chip ks_dw_pcie_legacy_irq_chip = {
+	.name = "Keystone-PCI-Legacy-IRQ",
+	.irq_ack = ks_dw_pcie_ack_legacy_irq,
+	.irq_mask = ks_dw_pcie_mask_legacy_irq,
+	.irq_unmask = ks_dw_pcie_unmask_legacy_irq,
+};
+
+static int ks_dw_pcie_init_legacy_irq_map(struct irq_domain *d,
+				unsigned int irq, irq_hw_number_t hw_irq)
+{
+	irq_set_chip_and_handler(irq, &ks_dw_pcie_legacy_irq_chip,
+				handle_level_irq);
+	irq_set_chip_data(irq, d->host_data);
+	set_irq_flags(irq, IRQF_VALID);
+
+	return 0;
+}
+
+static const struct irq_domain_ops ks_dw_pcie_legacy_irq_domian_ops = {
+	.map = ks_dw_pcie_init_legacy_irq_map,
+	.xlate = irq_domain_xlate_onetwocell,
+};
+
+/**
+ * ks_dw_pcie_set_dbi_mode() - Set DBI mode to access overlaid BAR mask registers
+ *
+ * Since modification of dbi_cs2 involves different clock domain, read the
+ * status back to ensure the transition is complete.
+ */
+static void ks_dw_pcie_set_dbi_mode(void __iomem *reg_virt)
+{
+	u32 val;
+
+	writel(DBI_CS2_EN_VAL | readl(reg_virt + CMD_STATUS),
+		     reg_virt + CMD_STATUS);
+
+	do {
+		val = readl(reg_virt + CMD_STATUS);
+	} while (!(val & DBI_CS2_EN_VAL));
+}
+
+/**
+ * ks_dw_pcie_clear_dbi_mode() - Disable DBI mode
+ *
+ * Since modification of dbi_cs2 involves different clock domain, read the
+ * status back to ensure the transition is complete.
+ */
+static void ks_dw_pcie_clear_dbi_mode(void __iomem *reg_virt)
+{
+	u32 val;
+
+	writel(~DBI_CS2_EN_VAL & readl(reg_virt + CMD_STATUS),
+		     reg_virt + CMD_STATUS);
+
+	do {
+		val = readl(reg_virt + CMD_STATUS);
+	} while (val & DBI_CS2_EN_VAL);
+}
+
+void ks_dw_pcie_setup_rc_app_regs(struct keystone_pcie *ks_pcie)
+{
+	struct pcie_port *pp = &ks_pcie->pp;
+	u32 start = pp->mem.start, end = pp->mem.end;
+	int i, tr_size;
+
+	/* disable BARS for inbound access */
+	ks_dw_pcie_set_dbi_mode(ks_pcie->va_app_base);
+	writel(0, pp->dbi_base + PCI_BASE_ADDRESS_0);
+	writel(0, pp->dbi_base + PCI_BASE_ADDRESS_1);
+	ks_dw_pcie_clear_dbi_mode(ks_pcie->va_app_base);
+
+	/* Set outbound translation size per window division */
+	writel(CFG_PCIM_WIN_SZ_IDX & 0x7, ks_pcie->va_app_base + OB_SIZE);
+
+	tr_size = (1 << (CFG_PCIM_WIN_SZ_IDX & 0x7)) * SZ_1M;
+
+	/* Using Direct 1:1 mapping of RC <-> PCI memory space */
+	for (i = 0; (i < CFG_PCIM_WIN_CNT) && (start < end); i++) {
+		writel(start | 1, ks_pcie->va_app_base + OB_OFFSET_INDEX(i));
+		writel(0, ks_pcie->va_app_base + OB_OFFSET_HI(i));
+		start += tr_size;
+	}
+
+	/* Enable OB translation */
+	writel(OB_XLAT_EN_VAL | readl(ks_pcie->va_app_base + CMD_STATUS),
+		ks_pcie->va_app_base + CMD_STATUS);
+}
+
+/**
+ * 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 pcie_port *pp = &ks_pcie->pp;
+	u32 regval;
+
+	if (bus == 0)
+		return pp->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);
+
+	writel(regval, ks_pcie->va_app_base + CFG_SETUP);
+	return pp->va_cfg0_base;
+}
+
+int ks_dw_pcie_rd_other_conf(struct pcie_port *pp, struct pci_bus *bus,
+		unsigned int devfn, int where, int size, u32 *val)
+{
+	struct keystone_pcie *ks_pcie = to_keystone_pcie(pp);
+	u8 bus_num = bus->number;
+	void __iomem *addr;
+	int ret;
+
+	addr = ks_pcie_cfg_setup(ks_pcie, bus_num, devfn);
+	ret = dw_pcie_cfg_read(addr + (where & ~0x3), where, size, val);
+
+	return ret;
+}
+
+int ks_dw_pcie_wr_other_conf(struct pcie_port *pp,
+		struct pci_bus *bus, unsigned int devfn, int where,
+		int size, u32 val)
+{
+	struct keystone_pcie *ks_pcie = to_keystone_pcie(pp);
+	u8 bus_num = bus->number;
+	void __iomem *addr;
+
+	addr = ks_pcie_cfg_setup(ks_pcie, bus_num, devfn);
+
+	return dw_pcie_cfg_write(addr + (where & ~0x3), where, size, val);
+}
+
+/**
+ * ks_dw_pcie_v3_65_scan_bus() - keystone scan_bus post initialization
+ *
+ * This sets BAR0 to enable inbound access for MSI_IRQ register
+ */
+void ks_dw_pcie_v3_65_scan_bus(struct pcie_port *pp)
+{
+	struct keystone_pcie *ks_pcie = to_keystone_pcie(pp);
+
+	/* Configure and set up BAR0 */
+	ks_dw_pcie_set_dbi_mode(ks_pcie->va_app_base);
+
+	/* Enable BAR0 */
+	writel(1, pp->dbi_base + PCI_BASE_ADDRESS_0);
+	writel(SZ_4K - 1, pp->dbi_base + PCI_BASE_ADDRESS_0);
+
+	ks_dw_pcie_clear_dbi_mode(ks_pcie->va_app_base);
+
+	 /*
+	  * For BAR0, just setting bus address for inbound writes (MSI) should
+	  * be sufficient. Use physical address to avoid any conflicts.
+	  */
+	writel(ks_pcie->app.start, pp->dbi_base + PCI_BASE_ADDRESS_0);
+}
+
+/**
+ * ks_dw_pcie_link_up() - Check if link up
+ *
+ */
+int ks_dw_pcie_link_up(struct pcie_port *pp)
+{
+	u32 val = readl(pp->dbi_base + DEBUG0);
+
+	return (val & LTSSM_STATE_MASK) == LTSSM_STATE_L0;
+}
+
+void ks_dw_pcie_initiate_link_train(struct keystone_pcie *ks_pcie)
+{
+	u32 val;
+
+	/* Initiate Link Training.  */
+	val = readl(ks_pcie->va_app_base + CMD_STATUS);
+	writel(LTSSM_EN_VAL | val,  ks_pcie->va_app_base + CMD_STATUS);
+}
+
+/**
+ * ks_dw_pcie_host_init() - initialize host for v3_65 dw hardware
+ *
+ * It ioremap the register resources, initialize legacy irq domain
+ * and then call dw_pcie_v3_65_host_init() API to intialize the Keystone
+ * PCI host controller.
+ *
+ */
+int __init ks_dw_pcie_host_init(struct keystone_pcie *ks_pcie,
+				struct device_node *msi_intc_np)
+{
+	struct pcie_port *pp = &ks_pcie->pp;
+	struct platform_device *pdev = to_platform_device(pp->dev);
+	struct resource *res;
+
+	/* index 0 is the config reg. space address */
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	pp->dbi_base = devm_ioremap_resource(pp->dev, res);
+	if (IS_ERR(pp->dbi_base))
+		return PTR_ERR(pp->dbi_base);
+
+	/*
+	 * we set these same and is used in pcie rd/wr_other_conf
+	 * functions
+	 */
+	pp->va_cfg0_base = pp->dbi_base + SPACE0_REMOTE_CFG_OFFSET;
+	pp->va_cfg1_base = pp->va_cfg0_base;
+
+	/* index 1 is the application reg. space address */
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	ks_pcie->app = *res;
+	ks_pcie->va_app_base = devm_ioremap_resource(pp->dev, res);
+	if (IS_ERR(ks_pcie->va_app_base))
+		return PTR_ERR(ks_pcie->va_app_base);
+
+	/* create legacy irq domain */
+	ks_pcie->legacy_irq_domain =
+			irq_domain_add_linear(ks_pcie->legacy_intc_np,
+					MAX_LEGACY_IRQS,
+					&ks_dw_pcie_legacy_irq_domian_ops,
+					NULL);
+	if (!ks_pcie->legacy_irq_domain) {
+		dev_err(pp->dev, "Failed to add irq domain for legacy irqs\n");
+		return -EINVAL;
+	}
+
+	return dw_pcie_host_init(pp);
+}
diff --git a/drivers/pci/host/pci-keystone.c b/drivers/pci/host/pci-keystone.c
new file mode 100644
index 0000000..341ced8
--- /dev/null
+++ b/drivers/pci/host/pci-keystone.c
@@ -0,0 +1,385 @@
+/*
+ * PCIe host controller driver for Texas Instruments Keystone SoCs
+ *
+ * Copyright (C) 2013-2014 Texas Instruments., Ltd.
+ *		http://www.ti.com
+ *
+ * Author: Murali Karicheri <m-karicheri2@ti.com>
+ * Implementation based on pci-exynos.c and pcie-designware.c
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/irqchip/chained_irq.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/irqdomain.h>
+#include <linux/module.h>
+#include <linux/msi.h>
+#include <linux/of_irq.h>
+#include <linux/of.h>
+#include <linux/of_pci.h>
+#include <linux/platform_device.h>
+#include <linux/phy/phy.h>
+#include <linux/resource.h>
+#include <linux/signal.h>
+
+#include "pcie-designware.h"
+#include "pci-keystone.h"
+
+#define DRIVER_NAME	"keystone-pcie"
+
+/* driver specific constants */
+#define MAX_MSI_HOST_IRQS		8
+#define MAX_LEGACY_HOST_IRQS		4
+
+/* RC mode settings masks */
+#define PCIE_RC_MODE		BIT(2)
+#define PCIE_MODE_MASK		(BIT(1) | BIT(2))
+
+/* DEV_STAT_CTRL */
+#define PCIE_CAP_BASE		0x70
+
+#define to_keystone_pcie(x)	container_of(x, struct keystone_pcie, pp)
+
+static int ks_pcie_establish_link(struct keystone_pcie *ks_pcie)
+{
+	struct pcie_port *pp = &ks_pcie->pp;
+	int count = 200;
+
+	dw_pcie_setup_rc(pp);
+	if (ks_pcie->link_train)
+		ks_dw_pcie_initiate_link_train(ks_pcie);
+
+	/* check if the link is up or not */
+	while (!dw_pcie_link_up(pp)) {
+		usleep_range(100, 1000);
+		if (--count)
+			continue;
+		dev_err(pp->dev, "phy link never came up\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static void ks_pcie_msi_irq_handler(unsigned int irq, struct irq_desc *desc)
+{
+	struct keystone_pcie *ks_pcie = irq_desc_get_handler_data(desc);
+	u32 offset = irq - ks_pcie->msi_host_irqs[0];
+	struct pcie_port *pp = &ks_pcie->pp;
+	struct irq_chip *chip = irq_desc_get_chip(desc);
+
+	dev_dbg(pp->dev, "ks_pci_msi_irq_handler, irq %d\n", irq);
+
+	/*
+	 * The chained irq handler installation would have replaced normal
+	 * interrupt driver handler so we need to take care of mask/unmask and
+	 * ack operation.
+	 */
+	chained_irq_enter(chip, desc);
+	ks_dw_pcie_handle_msi_irq(ks_pcie, offset);
+	chained_irq_exit(chip, desc);
+}
+
+/**
+ * ks_pcie_legacy_irq_handler() - Handle legacy interrupt
+ * @irq: IRQ line for legacy interrupts
+ * @desc: Pointer to irq descriptor
+ *
+ * Traverse through pending legacy interrupts and invoke handler for each. Also
+ * takes care of interrupt controller level mask/ack operation.
+ */
+static void ks_pcie_legacy_irq_handler(unsigned int irq, struct irq_desc *desc)
+{
+	struct keystone_pcie *ks_pcie = irq_desc_get_handler_data(desc);
+	struct pcie_port *pp = &ks_pcie->pp;
+	u32 irq_offset = irq - ks_pcie->legacy_host_irqs[0];
+	struct irq_chip *chip = irq_desc_get_chip(desc);
+
+	dev_dbg(pp->dev, ": Handling legacy irq %d\n", irq);
+
+	/*
+	 * The chained irq handler installation would have replaced normal
+	 * interrupt driver handler so we need to take care of mask/unmask and
+	 * ack operation.
+	 */
+	chained_irq_enter(chip, desc);
+	ks_dw_pcie_handle_legacy_irq(ks_pcie, irq_offset);
+	chained_irq_exit(chip, desc);
+}
+
+static int ks_pcie_get_irq_controller_info(struct keystone_pcie *ks_pcie,
+					   char *controller, int *num_irqs)
+{
+	int temp, max_host_irqs, legacy = 1, *host_irqs, ret = -EINVAL;
+	struct device *dev = ks_pcie->pp.dev;
+	struct device_node *np_pcie = dev->of_node, **np_temp;
+
+	if (!strcmp(controller, "msi-interrupt-controller"))
+		legacy = 0;
+
+	if (legacy) {
+		np_temp = &ks_pcie->legacy_intc_np;
+		max_host_irqs = MAX_LEGACY_HOST_IRQS;
+		host_irqs = &ks_pcie->legacy_host_irqs[0];
+	} else {
+		np_temp = &ks_pcie->msi_intc_np;
+		max_host_irqs = MAX_MSI_HOST_IRQS;
+		host_irqs =  &ks_pcie->msi_host_irqs[0];
+	}
+
+	/* interrupt controller is in a child node */
+	*np_temp = of_find_node_by_name(np_pcie, controller);
+	if (!(*np_temp)) {
+		dev_err(dev, "Node for %s is absent\n", controller);
+		goto out;
+	}
+	temp = of_irq_count(*np_temp);
+	if (!temp)
+		goto out;
+	if (temp > max_host_irqs)
+		dev_warn(dev, "Too many %s interrupts defined %u\n",
+			(legacy ? "legacy" : "MSI"), temp);
+
+	/*
+	 * support upto max_host_irqs. In dt from index 0 to 3 (legacy) or 0 to
+	 * 7 (MSI)
+	 */
+	for (temp = 0; temp < max_host_irqs; temp++) {
+		host_irqs[temp] = irq_of_parse_and_map(*np_temp, temp);
+		if (host_irqs[temp] < 0)
+			break;
+	}
+	if (temp) {
+		*num_irqs = temp;
+		ret = 0;
+	}
+out:
+	return ret;
+}
+
+static void ks_pcie_setup_interrupts(struct keystone_pcie *ks_pcie)
+{
+	int i;
+
+	/* Legacy IRQ */
+	for (i = 0; i < ks_pcie->num_legacy_host_irqs; i++) {
+		irq_set_handler_data(ks_pcie->legacy_host_irqs[i], ks_pcie);
+		irq_set_chained_handler(ks_pcie->legacy_host_irqs[i],
+					ks_pcie_legacy_irq_handler);
+	}
+	ks_dw_pcie_enable_legacy_irqs(ks_pcie);
+
+	/* MSI IRQ */
+	if (IS_ENABLED(CONFIG_PCI_MSI)) {
+		for (i = 0; i < ks_pcie->num_msi_host_irqs; i++) {
+			irq_set_chained_handler(ks_pcie->msi_host_irqs[i],
+						ks_pcie_msi_irq_handler);
+			irq_set_handler_data(ks_pcie->msi_host_irqs[i],
+					     ks_pcie);
+		}
+	}
+}
+
+/*
+ * When a PCI device does not exist during config cycles, keystone host gets a
+ * bus error instead of returning 0xffffffff. This handler always returns 0
+ * for this kind of faults.
+ */
+static int keystone_pcie_fault(unsigned long addr, unsigned int fsr,
+				struct pt_regs *regs)
+{
+	unsigned long instr = *(unsigned long *) instruction_pointer(regs);
+
+	if ((instr & 0x0e100090) == 0x00100090) {
+		int reg = (instr >> 12) & 15;
+
+		regs->uregs[reg] = -1;
+		regs->ARM_pc += 4;
+	}
+
+	return 0;
+}
+
+static void __init ks_pcie_host_init(struct pcie_port *pp)
+{
+	u32 vendor_device_id, val;
+	struct keystone_pcie *ks_pcie = to_keystone_pcie(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),
+			pp->dbi_base + PCI_IO_BASE);
+
+	/* update the Vendor ID */
+	vendor_device_id = readl(ks_pcie->va_reg_pciid);
+	writew((vendor_device_id >> 16), pp->dbi_base + PCI_DEVICE_ID);
+
+	/* update the DEV_STAT_CTRL to publish right mrrs */
+	val = readl(pp->dbi_base + PCIE_CAP_BASE + PCI_EXP_DEVCTL);
+	val &= ~PCI_EXP_DEVCTL_READRQ;
+	/* set the mrrs to 256 bytes */
+	val |= BIT(12);
+	writel(val, pp->dbi_base + PCIE_CAP_BASE + PCI_EXP_DEVCTL);
+
+	/*
+	 * PCIe access errors that result into OCP errors are caught by ARM as
+	 * "External aborts"
+	 */
+	hook_fault_code(17, keystone_pcie_fault, SIGBUS, 0,
+			"Asynchronous external abort");
+}
+
+static struct pcie_host_ops keystone_pcie_host_ops = {
+	.rd_other_conf = ks_dw_pcie_rd_other_conf,
+	.wr_other_conf = ks_dw_pcie_wr_other_conf,
+	.link_up = ks_dw_pcie_link_up,
+	.host_init = ks_pcie_host_init,
+	.msi_set_irq = ks_dw_pcie_msi_set_irq,
+	.msi_clear_irq = ks_dw_pcie_msi_clear_irq,
+	.get_msi_data = ks_dw_pcie_get_msi_data,
+	.msi_host_init = ks_dw_pcie_msi_host_init,
+	.scan_bus = ks_dw_pcie_v3_65_scan_bus,
+};
+
+static int __init ks_add_pcie_port(struct keystone_pcie *ks_pcie,
+			 struct platform_device *pdev)
+{
+	struct pcie_port *pp = &ks_pcie->pp;
+	int ret;
+
+	ret = ks_pcie_get_irq_controller_info(ks_pcie,
+					"legacy-interrupt-controller",
+					&ks_pcie->num_legacy_host_irqs);
+	if (ret)
+		return ret;
+
+	if (IS_ENABLED(CONFIG_PCI_MSI)) {
+		ret = ks_pcie_get_irq_controller_info(ks_pcie,
+						"msi-interrupt-controller",
+						&ks_pcie->num_msi_host_irqs);
+		if (ret)
+			return ret;
+	}
+
+	pp->root_bus_nr = -1;
+	pp->ops = &keystone_pcie_host_ops;
+	ret = ks_dw_pcie_host_init(ks_pcie, ks_pcie->msi_intc_np);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to initialize host\n");
+		return ret;
+	}
+
+	return ret;
+}
+
+static const struct of_device_id ks_pcie_of_match[] = {
+	{
+		.type = "pci",
+		.compatible = "ti,keystone-pcie",
+	},
+	{ },
+};
+MODULE_DEVICE_TABLE(of, ks_pcie_of_match);
+
+static int __exit ks_pcie_remove(struct platform_device *pdev)
+{
+	struct keystone_pcie *ks_pcie = platform_get_drvdata(pdev);
+
+	clk_disable_unprepare(ks_pcie->clk);
+
+	return 0;
+}
+
+static int __init ks_pcie_probe(struct platform_device *pdev)
+{
+	struct device_node *np = pdev->dev.of_node;
+	struct device *dev = &pdev->dev;
+	struct keystone_pcie *ks_pcie;
+	struct pcie_port *pp;
+	struct resource *res;
+	void __iomem *reg_p;
+	struct phy *phy;
+	int ret = 0;
+	u32 val;
+
+	ks_pcie = devm_kzalloc(&pdev->dev, sizeof(*ks_pcie),
+				GFP_KERNEL);
+	if (!ks_pcie) {
+		dev_err(dev, "no memory for keystone pcie\n");
+		return -ENOMEM;
+	}
+	pp = &ks_pcie->pp;
+
+	/* initialize SerDes Phy if present */
+	phy = devm_phy_get(dev, "pcie-phy");
+	if (!IS_ERR_OR_NULL(phy)) {
+		ret = phy_init(phy);
+		if (ret < 0)
+			return ret;
+	}
+
+	/* index 2 is the devcfg register for RC mode settings */
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
+	reg_p = devm_ioremap_resource(dev, res);
+	if (IS_ERR(reg_p))
+		return PTR_ERR(reg_p);
+
+	/* enable RC mode in devcfg */
+	val = readl(reg_p);
+	val &= ~PCIE_MODE_MASK;
+	val |= PCIE_RC_MODE;
+	writel(val, reg_p);
+
+	/* index 3 is to read PCI DEVICE_ID */
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 3);
+	reg_p = devm_ioremap_resource(dev, res);
+	if (IS_ERR(reg_p))
+		return PTR_ERR(reg_p);
+	ks_pcie->va_reg_pciid = reg_p;
+
+	/* check if we need to enable link training */
+	ks_pcie->link_train =
+		(of_get_property(np, "ti,enable-linktrain", NULL) != NULL);
+
+	pp->dev = dev;
+	platform_set_drvdata(pdev, ks_pcie);
+	ks_pcie->clk = devm_clk_get(dev, "pcie");
+	if (IS_ERR(ks_pcie->clk)) {
+		dev_err(dev, "Failed to get pcie rc clock\n");
+		return PTR_ERR(ks_pcie->clk);
+	}
+	ret = clk_prepare_enable(ks_pcie->clk);
+	if (ret)
+		return ret;
+
+	ret = ks_add_pcie_port(ks_pcie, pdev);
+	if (ret < 0)
+		goto fail_clk;
+
+	return 0;
+fail_clk:
+	clk_disable_unprepare(ks_pcie->clk);
+
+	return ret;
+}
+
+static struct platform_driver ks_pcie_driver __refdata = {
+	.probe  = ks_pcie_probe,
+	.remove = __exit_p(ks_pcie_remove),
+	.driver = {
+		.name	= "keystone-pcie",
+		.owner	= THIS_MODULE,
+		.of_match_table = of_match_ptr(ks_pcie_of_match),
+	},
+};
+
+module_platform_driver(ks_pcie_driver);
+
+MODULE_AUTHOR("Murali Karicheri <m-karicheri2@ti.com>");
+MODULE_DESCRIPTION("Keystone PCIe host controller driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/pci/host/pci-keystone.h b/drivers/pci/host/pci-keystone.h
new file mode 100644
index 0000000..0bedfc5
--- /dev/null
+++ b/drivers/pci/host/pci-keystone.h
@@ -0,0 +1,59 @@
+/*
+ * Keystone PCI Controller's common includes
+ *
+ * Copyright (C) 2013-2014 Texas Instruments., Ltd.
+ *		http://www.ti.com
+ *
+ * Author: Murali Karicheri <m-karicheri2@ti.com>
+ *
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#define MAX_LEGACY_IRQS			4
+#define MAX_MSI_HOST_IRQS		8
+#define MAX_LEGACY_HOST_IRQS		4
+
+struct keystone_pcie {
+	struct	clk		*clk;
+	int			link_train;
+	struct	pcie_port	pp;
+	void __iomem		*va_reg_pciid;
+
+	int			num_legacy_host_irqs;
+	int			legacy_host_irqs[MAX_LEGACY_HOST_IRQS];
+	struct			device_node *legacy_intc_np;
+
+	int			num_msi_host_irqs;
+	int			msi_host_irqs[MAX_MSI_HOST_IRQS];
+	struct			device_node *msi_intc_np;
+	struct irq_domain	*legacy_irq_domain;
+
+	/* Application register space */
+	void __iomem		*va_app_base;
+	struct resource		app;
+};
+
+/* Keystone DW specific MSI controller APIs/definitions */
+void ks_dw_pcie_handle_msi_irq(struct keystone_pcie *ks_pcie, int offset);
+u32 ks_dw_pcie_get_msi_data(struct pcie_port *pp);
+
+/* Keystone specific PCI controller APIs */
+void ks_dw_pcie_enable_legacy_irqs(struct keystone_pcie *ks_pcie);
+void ks_dw_pcie_handle_legacy_irq(struct keystone_pcie *ks_pcie, int offset);
+int  ks_dw_pcie_host_init(struct keystone_pcie *ks_pcie,
+			struct device_node *msi_intc_np);
+int ks_dw_pcie_wr_other_conf(struct pcie_port *pp, struct pci_bus *bus,
+		unsigned int devfn, int where, int size, u32 val);
+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);
+int ks_dw_pcie_link_up(struct pcie_port *pp);
+void ks_dw_pcie_initiate_link_train(struct keystone_pcie *ks_pcie);
+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);
+void ks_dw_pcie_v3_65_scan_bus(struct pcie_port *pp);
+int ks_dw_pcie_msi_host_init(struct pcie_port *pp,
+		struct msi_chip *chip);
-- 
1.7.9.5

[PATCH v5 5/5] PCI: keystone: Update maintainer information

[Murali Karicheri]

Update the MAINTAINERS file for the keystone PCIe driver

Signed-off-by: Murali Karicheri <m-karicheri2@ti.com>

CC: Santosh Shilimkar <santosh.shilimkar@ti.com>
CC: Russell King <linux@arm.linux.org.uk>
CC: Grant Likely <grant.likely@linaro.org>
CC: Rob Herring <robh+dt@kernel.org>
CC: Mohit Kumar <mohit.kumar@st.com>
CC: Jingoo Han <jg1.han@samsung.com>
CC: Bjorn Helgaas <bhelgaas@google.com>
CC: Pratyush Anand <pratyush.anand@st.com>
CC: Richard Zhu <r65037@freescale.com>
CC: Kishon Vijay Abraham I <kishon@ti.com>
CC: Marek Vasut <marex@denx.de>
CC: Arnd Bergmann <arnd@arndb.de>
CC: Pawel Moll <pawel.moll@arm.com>
CC: Mark Rutland <mark.rutland@arm.com>
CC: Ian Campbell <ijc+devicetree@hellion.org.uk>
CC: Kumar Gala <galak@codeaurora.org>
CC: Randy Dunlap <rdunlap@infradead.org>
CC: Grant Likely <grant.likely@linaro.org>
---
 MAINTAINERS |    7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index e31c874..8158f82 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -6807,6 +6807,13 @@ L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
 S:	Maintained
 F:	drivers/pci/host/*imx6*
 
+PCI DRIVER FOR keystone
+M:	Murali Karicheri <m-karicheri2@ti.com>
+L:	linux-pci@vger.kernel.org
+L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
+S:	Maintained
+F:	drivers/pci/host/*keystone*
+
 PCI DRIVER FOR MVEBU (Marvell Armada 370 and Armada XP SOC support)
 M:	Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
 M:	Jason Cooper <jason@lakedaemon.net>
-- 
1.7.9.5

Re: [PATCH v5 1/5] PCI: designware: add rd[wr]_other_conf API

[Pratyush Anand]

On Thu, Jul 17, 2014 at 12:38:02AM +0800, Murali Karicheri wrote:
> v3.65 version of the designware h/w, requires application space
> registers to be configured to access the remote EP config space.
> To support this, add rd[wr]_other_conf API in the pcie_host_opts
> 
> Signed-off-by: Murali Karicheri <m-karicheri2@ti.com>
> Acked-by: Mohit Kumar <mohit.kumar@st.com>
> Acked-by: Jingoo Han <jg1.han@samsung.com>
> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
> 

Reviewed-by: Pratyush Anand <pratyush.anand@st.com>

Re: [PATCH v5 2/5] PCI: designware: refactor MSI code to work with v3.65 dw hardware

[Pratyush Anand]

On Thu, Jul 17, 2014 at 12:38:03AM +0800, Murali Karicheri wrote:
> Keystone PCI controller is based on v3.65 version of the DW
> PCI h/w that implements MSI controller registers in application
> space compared to the newer version. This requires updates to
> the DW core API to support the PCI controller driver based on
> this old DW hardware. Add msi_irq_set()/clear() API functions to
> allow Set/Clear MSI IRQ enable bit in the application register.
> Also the old h/w uses MSI_IRQ register in application register
> space to raise MSI IRQ to the RC from EP. Current code uses the
> standard mechanism as per PCI spec. So add another API get_msi_data()
> to get the address of this register so that common code can be
> re-used on old h/w.
> 
> Signed-off-by: Murali Karicheri <m-karicheri2@ti.com>
> Acked-by: Mohit Kumar <mohit.kumar@st.com>
> Acked-by: Jingoo Han <jg1.han@samsung.com>
> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
> 

Reviewed-by: Pratyush Anand <pratyush.anand@st.com>

Re: [PATCH v5 3/5] PCI: designware: enhance dw_pcie_host_init() to support v3.65 DW hardware

[Pratyush Anand]

On Thu, Jul 17, 2014 at 12:38:04AM +0800, Murali Karicheri wrote:
> keystone PCI controller is based on v3.65 designware hardware. This
> version differs from newer versions of the hardware in few functional
> areas discussed below that makes it necessary to change dw_pcie_host_init()
> to support v3.65 based PCI controller.
> 
>  1. No support for ATU port. So any ATU specific resource handling code
>     is to be bypassed for v3.65 h/w.
>  2. MSI controller uses Application space to implement MSI and 32 MSI
>     interrupts are multiplexed over 8 IRQs to the host. Hence the code
>     to process MSI IRQ needs to be different. This patch allows platform
>     driver to provide its own irq_domain_ops ptr to irq_domain_add_linear()
>     through an API callback from the designware core driver.
>  3. MSI interrupt generation requires EP to write to the RC's application
>     register. So enhance the driver to allow setup of inbound access to
>     MSI irq register as a post scan bus API callback.
> 
> Signed-off-by: Murali Karicheri <m-karicheri2@ti.com>

Looks almost ok to me.

Reviewed-by: Pratyush Anand <pratyush.anand@st.com>

>  int __init dw_pcie_host_init(struct pcie_port *pp)
>  {
>  	struct device_node *np = pp->dev->of_node;
> -	struct of_pci_range range;
>  	struct of_pci_range_parser parser;
> +	struct of_pci_range range;

You may avoid moving the above line.

~Pratyush

RE: [PATCH v5 3/5] PCI: designware: enhance dw_pcie_host_init() to support v3.65 DW hardware

[Mohit KUMAR DCG]

> -----Original Message-----
> From: Pratyush ANAND
> Sent: Thursday, July 17, 2014 9:07 AM
> To: Murali Karicheri
> Cc: linux-pci@vger.kernel.org; linux-kernel@vger.kernel.org; linux-arm-
> kernel@lists.infradead.org; Santosh Shilimkar; Russell King; Grant Likely; Rob
> Herring; Mohit KUMAR DCG; Jingoo Han; Bjorn Helgaas; Richard Zhu; Kishon
> Vijay Abraham I; Marek Vasut; Arnd Bergmann; Pawel Moll; Mark Rutland;
> Ian Campbell; Kumar Gala; Randy Dunlap
> Subject: Re: [PATCH v5 3/5] PCI: designware: enhance dw_pcie_host_init()
> to support v3.65 DW hardware
> 
> On Thu, Jul 17, 2014 at 12:38:04AM +0800, Murali Karicheri wrote:
> > keystone PCI controller is based on v3.65 designware hardware. This
> > version differs from newer versions of the hardware in few functional
> > areas discussed below that makes it necessary to change
> > dw_pcie_host_init() to support v3.65 based PCI controller.
> >
> >  1. No support for ATU port. So any ATU specific resource handling code
> >     is to be bypassed for v3.65 h/w.
> >  2. MSI controller uses Application space to implement MSI and 32 MSI
> >     interrupts are multiplexed over 8 IRQs to the host. Hence the code
> >     to process MSI IRQ needs to be different. This patch allows platform
> >     driver to provide its own irq_domain_ops ptr to irq_domain_add_linear()
> >     through an API callback from the designware core driver.
> >  3. MSI interrupt generation requires EP to write to the RC's application
> >     register. So enhance the driver to allow setup of inbound access to
> >     MSI irq register as a post scan bus API callback.
> >
> > Signed-off-by: Murali Karicheri <m-karicheri2@ti.com>
> 
> Looks almost ok to me.
> 
> Reviewed-by: Pratyush Anand <pratyush.anand@st.com>
> 

- Now looks fine to me.

Acked-by: Mohit KUMAR <mohit.kumar@st.com>

Jingoo,
After Murali's patches,  dw code can be used by  older Synopsys controller based driver too.
Pls have a look at the series if you have any further comment.

Thanks
Mohit

> >  int __init dw_pcie_host_init(struct pcie_port *pp)  {
> >  	struct device_node *np = pp->dev->of_node;
> > -	struct of_pci_range range;
> >  	struct of_pci_range_parser parser;
> > +	struct of_pci_range range;
> 
> You may avoid moving the above line.
> 
> ~Pratyush

Re: [PATCH v5 3/5] PCI: designware: enhance dw_pcie_host_init() to support v3.65 DW hardware

[Murali Karicheri]

On 07/16/2014 11:36 PM, Pratyush Anand wrote:
> On Thu, Jul 17, 2014 at 12:38:04AM +0800, Murali Karicheri wrote:
>> keystone PCI controller is based on v3.65 designware hardware. This
>> version differs from newer versions of the hardware in few functional
>> areas discussed below that makes it necessary to change dw_pcie_host_init()
>> to support v3.65 based PCI controller.
>>
>>   1. No support for ATU port. So any ATU specific resource handling code
>>      is to be bypassed for v3.65 h/w.
>>   2. MSI controller uses Application space to implement MSI and 32 MSI
>>      interrupts are multiplexed over 8 IRQs to the host. Hence the code
>>      to process MSI IRQ needs to be different. This patch allows platform
>>      driver to provide its own irq_domain_ops ptr to irq_domain_add_linear()
>>      through an API callback from the designware core driver.
>>   3. MSI interrupt generation requires EP to write to the RC's application
>>      register. So enhance the driver to allow setup of inbound access to
>>      MSI irq register as a post scan bus API callback.
>>
>> Signed-off-by: Murali Karicheri<m-karicheri2@ti.com>
> Looks almost ok to me.
>
> Reviewed-by: Pratyush Anand<pratyush.anand@st.com>
>
>>   int __init dw_pcie_host_init(struct pcie_port *pp)
>>   {
>>   	struct device_node *np = pp->dev->of_node;
>> -	struct of_pci_range range;
>>   	struct of_pci_range_parser parser;
>> +	struct of_pci_range range;
> You may avoid moving the above line.
Thought the variables are to be sorted. I can fix this when I resend it 
today with your reviewed by and Mohit's Ack.

Regards,

Murali
> ~Pratyush

Re: [PATCH v5 3/5] PCI: designware: enhance dw_pcie_host_init() to support v3.65 DW hardware

[Murali Karicheri]

On 07/17/2014 12:18 AM, Mohit KUMAR DCG wrote:
>
>
>> -----Original Message-----
>> From: Pratyush ANAND
>> Sent: Thursday, July 17, 2014 9:07 AM
>> To: Murali Karicheri
>> Cc: linux-pci@vger.kernel.org; linux-kernel@vger.kernel.org; linux-arm-
>> kernel@lists.infradead.org; Santosh Shilimkar; Russell King; Grant Likely; Rob
>> Herring; Mohit KUMAR DCG; Jingoo Han; Bjorn Helgaas; Richard Zhu; Kishon
>> Vijay Abraham I; Marek Vasut; Arnd Bergmann; Pawel Moll; Mark Rutland;
>> Ian Campbell; Kumar Gala; Randy Dunlap
>> Subject: Re: [PATCH v5 3/5] PCI: designware: enhance dw_pcie_host_init()
>> to support v3.65 DW hardware
>>
>> On Thu, Jul 17, 2014 at 12:38:04AM +0800, Murali Karicheri wrote:
>>> keystone PCI controller is based on v3.65 designware hardware. This
>>> version differs from newer versions of the hardware in few functional
>>> areas discussed below that makes it necessary to change
>>> dw_pcie_host_init() to support v3.65 based PCI controller.
>>>
>>>   1. No support for ATU port. So any ATU specific resource handling code
>>>      is to be bypassed for v3.65 h/w.
>>>   2. MSI controller uses Application space to implement MSI and 32 MSI
>>>      interrupts are multiplexed over 8 IRQs to the host. Hence the code
>>>      to process MSI IRQ needs to be different. This patch allows platform
>>>      driver to provide its own irq_domain_ops ptr to irq_domain_add_linear()
>>>      through an API callback from the designware core driver.
>>>   3. MSI interrupt generation requires EP to write to the RC's application
>>>      register. So enhance the driver to allow setup of inbound access to
>>>      MSI irq register as a post scan bus API callback.
>>>
>>> Signed-off-by: Murali Karicheri<m-karicheri2@ti.com>
>>
>> Looks almost ok to me.
>>
>> Reviewed-by: Pratyush Anand<pratyush.anand@st.com>
>>
>
> - Now looks fine to me.
>
> Acked-by: Mohit KUMAR<mohit.kumar@st.com>
>
> Jingoo,
> After Murali's patches,  dw code can be used by  older Synopsys controller based driver too.
> Pls have a look at the series if you have any further comment.
>
> Thanks
> Mohit

Mohit,

Thanks for the review and Ack.

Murali
>
>>>   int __init dw_pcie_host_init(struct pcie_port *pp)  {
>>>   	struct device_node *np = pp->dev->of_node;
>>> -	struct of_pci_range range;
>>>   	struct of_pci_range_parser parser;
>>> +	struct of_pci_range range;
>>
>> You may avoid moving the above line.
>>
>> ~Pratyush

Re: [PATCH v5 4/5] PCI: add PCI controller for keystone PCIe h/w

[Murali Karicheri]

On 07/16/2014 12:38 PM, Murali Karicheri wrote:
> keystone PCIe controller is based on v3.65 version of the
> designware h/w. Main differences are
> 	1. No ATU support
> 	2. Legacy and MSI irq functions are implemented in
> 	   application register space
> 	3. MSI interrupts are multiplexed over 8 IRQ lines to the Host
> 	   side.
> All of the Application register space handing code are organized into
> pci-keystone-dw.c and the functions are called from pci-keystone.c
> to implement PCI controller driver. Also add necessary DT documentation
> for the driver.
>
> Signed-off-by: Murali Karicheri<m-karicheri2@ti.com>
> Acked-by: Santosh Shilimkar<santosh.shilimkar@ti.com>
>
> CC: Russell King<linux@arm.linux.org.uk>
> CC: Grant Likely<grant.likely@linaro.org>
> CC: Rob Herring<robh+dt@kernel.org>
> CC: Mohit Kumar<mohit.kumar@st.com>
> CC: Jingoo Han<jg1.han@samsung.com>
> CC: Bjorn Helgaas<bhelgaas@google.com>
> CC: Pratyush Anand<pratyush.anand@st.com>
> CC: Richard Zhu<r65037@freescale.com>
> CC: Kishon Vijay Abraham I<kishon@ti.com>
> CC: Marek Vasut<marex@denx.de>
> CC: Arnd Bergmann<arnd@arndb.de>
> CC: Pawel Moll<pawel.moll@arm.com>
> CC: Mark Rutland<mark.rutland@arm.com>
> CC: Ian Campbell<ijc+devicetree@hellion.org.uk>
> CC: Kumar Gala<galak@codeaurora.org>
> CC: Randy Dunlap<rdunlap@infradead.org>
> CC: Grant Likely<grant.likely@linaro.org>
> ---
>   .../devicetree/bindings/pci/pci-keystone.txt       |   71 +++
>   drivers/pci/host/Kconfig                           |    5 +
>   drivers/pci/host/Makefile                          |    1 +
>   drivers/pci/host/pci-keystone-dw.c                 |  516 ++++++++++++++++++++
>   drivers/pci/host/pci-keystone.c                    |  385 +++++++++++++++
>   drivers/pci/host/pci-keystone.h                    |   59 +++
>   6 files changed, 1037 insertions(+)
>   create mode 100644 Documentation/devicetree/bindings/pci/pci-keystone.txt
>   create mode 100644 drivers/pci/host/pci-keystone-dw.c
>   create mode 100644 drivers/pci/host/pci-keystone.c
>   create mode 100644 drivers/pci/host/pci-keystone.h
>
> diff --git a/Documentation/devicetree/bindings/pci/pci-keystone.txt b/Documentation/devicetree/bindings/pci/pci-keystone.txt
> new file mode 100644
> index 0000000..9c96164
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pci/pci-keystone.txt
> @@ -0,0 +1,71 @@
> +TI Keystone PCIe interface
> +
> +Keystone PCI host Controller is based on Designware PCI h/w version 3.65.
> +It shares common functions with PCIE Designware core driver and inherit
> +common properties defined in
> +Documentation/devicetree/bindings/pci/designware-pci.txt
> +
> +Please refer to Documentation/devicetree/bindings/pci/designware-pci.txt
> +for the details of designware DT bindings. Additional properties are
> +described here as well propeties that are not applicable.
> +
> +Required Properties:-
> +
> +compatibility: "ti,keystone-pcie"
> +reg:	index 1 is the base address and length of DW application registers.
> +	index 2 is the base address and length of PCI mode configuration
> +	register.
> +	index 3 is the base address and length of PCI device ID register.
> +
> +pcie_msi_intc : Interrupt controller device node for MSI irq chip
> +	interrupt-cells: should be set to 1
> +	interrupt-parent: Parent interrupt controller phandle
> +	interrupts: GIC interrupt lines connected to PCI MSI interrupt lines
> +
> + Example:
> +	pcie_msi_intc: msi-interrupt-controller {
> +			interrupt-controller;
> +			#interrupt-cells =<1>;
> +			interrupt-parent =<&gic>;
> +			interrupts =<GIC_SPI 30 IRQ_TYPE_EDGE_RISING>,
> +					<GIC_SPI 31 IRQ_TYPE_EDGE_RISING>,
> +					<GIC_SPI 32 IRQ_TYPE_EDGE_RISING>,
> +					<GIC_SPI 33 IRQ_TYPE_EDGE_RISING>,
> +					<GIC_SPI 34 IRQ_TYPE_EDGE_RISING>,
> +					<GIC_SPI 35 IRQ_TYPE_EDGE_RISING>,
> +					<GIC_SPI 36 IRQ_TYPE_EDGE_RISING>,
> +					<GIC_SPI 37 IRQ_TYPE_EDGE_RISING>;
> +	};
> +
> +pcie_intc: Interrupt controller device node for Legacy irq chip
> +	interrupt-cells: should be set to 1
> +	interrupt-parent: Parent interrupt controller phandle
> +	interrupts: GIC interrupt lines connected to PCI Legacy interrupt lines
> +
> + Example:
> +	pcie_intc: legacy-interrupt-controller {
> +		interrupt-controller;
> +		#interrupt-cells =<1>;
> +		interrupt-parent =<&gic>;
> +		interrupts =<GIC_SPI 26 IRQ_TYPE_EDGE_RISING>,
> +			<GIC_SPI 27 IRQ_TYPE_EDGE_RISING>,
> +			<GIC_SPI 28 IRQ_TYPE_EDGE_RISING>,
> +			<GIC_SPI 29 IRQ_TYPE_EDGE_RISING>;
> +	};
> +
> +Optional properties:-
> +	phys: phandle to Generic Keystone SerDes phy for PCI
> +	phy-names: name of the Generic Keystine SerDes phy for PCI
> +	  - If boot loader already does PCI link establishment, then phys and
> +	    phy-names shouldn't be present.
> +	ti,enable-linktrain - Enable Link training.
> +	  - If boot loader already does PCI link establishment, then this
> +	    shouldn't be present.
> +
> +Designware DT Properties not applicable for Keystone PCI
> +
> +1. pcie_bus clock-names not used. Instead, a phandle to phys is used.
> +
> +Note for PCI driver usage
> +=========================
> +Driver requires pci=pcie_bus_perf in the bootargs for proper functioning.
> diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig
> index 21df477..f8bc475 100644
> --- a/drivers/pci/host/Kconfig
> +++ b/drivers/pci/host/Kconfig
> @@ -46,4 +46,9 @@ config PCI_HOST_GENERIC
>   	  Say Y here if you want to support a simple generic PCI host
>   	  controller, such as the one emulated by kvmtool.
>
> +config PCI_KEYSTONE
> +	bool "TI Keystone PCIe controller"
> +	depends on ARCH_KEYSTONE
> +	select PCIE_DW
> +	select PCIEPORTBUS
>   endmenu
> diff --git a/drivers/pci/host/Makefile b/drivers/pci/host/Makefile
> index 611ba4b..d1b6ce1 100644
> --- a/drivers/pci/host/Makefile
> +++ b/drivers/pci/host/Makefile
> @@ -6,3 +6,4 @@ obj-$(CONFIG_PCI_TEGRA) += pci-tegra.o
>   obj-$(CONFIG_PCI_RCAR_GEN2) += pci-rcar-gen2.o
>   obj-$(CONFIG_PCI_RCAR_GEN2_PCIE) += pcie-rcar.o
>   obj-$(CONFIG_PCI_HOST_GENERIC) += pci-host-generic.o
> +obj-$(CONFIG_PCI_KEYSTONE) += pci-keystone-dw.o pci-keystone.o
> diff --git a/drivers/pci/host/pci-keystone-dw.c b/drivers/pci/host/pci-keystone-dw.c
> new file mode 100644
> index 0000000..b75582c
> --- /dev/null
> +++ b/drivers/pci/host/pci-keystone-dw.c
> @@ -0,0 +1,516 @@
> +/*
> + * Designware application register space functions for Keystone PCI controller
> + *
> + * Copyright (C) 2013-2014 Texas Instruments., Ltd.
> + *		http://www.ti.com
> + *
> + * Author: Murali Karicheri<m-karicheri2@ti.com>
> + *
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#include<linux/irq.h>
> +#include<linux/irqdomain.h>
> +#include<linux/module.h>
> +#include<linux/of.h>
> +#include<linux/of_pci.h>
> +#include<linux/pci.h>
> +#include<linux/platform_device.h>
> +
> +#include "pcie-designware.h"
> +#include "pci-keystone.h"
> +
> +/* Application register defines */
> +#define LTSSM_EN_VAL		        1
> +#define LTSSM_STATE_MASK		0x1f
> +#define LTSSM_STATE_L0			0x11
> +#define DBI_CS2_EN_VAL			0x20
> +#define OB_XLAT_EN_VAL		        2
> +
> +/* Application registers */
> +#define CMD_STATUS			0x004
> +#define CFG_SETUP			0x008
> +#define OB_SIZE				0x030
> +#define CFG_PCIM_WIN_SZ_IDX		3
> +#define CFG_PCIM_WIN_CNT		32
> +#define SPACE0_REMOTE_CFG_OFFSET	0x1000
> +#define OB_OFFSET_INDEX(n)		(0x200 + (8 * n))
> +#define OB_OFFSET_HI(n)			(0x204 + (8 * n))
> +
> +/* IRQ register defines */
> +#define IRQ_EOI				0x050
> +#define IRQ_STATUS			0x184
> +#define IRQ_ENABLE_SET			0x188
> +#define IRQ_ENABLE_CLR			0x18c
> +
> +#define MSI_IRQ				0x054
> +#define MSI0_IRQ_STATUS			0x104
> +#define MSI0_IRQ_ENABLE_SET		0x108
> +#define MSI0_IRQ_ENABLE_CLR		0x10c
> +#define IRQ_STATUS			0x184
> +#define MSI_IRQ_OFFSET			4
> +
> +/* Config space registers */
> +#define DEBUG0				0x728
> +
> +#define to_keystone_pcie(x)	container_of(x, struct keystone_pcie, pp)
> +
> +static inline struct pcie_port *sys_to_pcie(struct pci_sys_data *sys)
> +{
> +	return sys->private_data;
> +}
> +
> +static inline void update_reg_offset_bit_pos(u32 offset, u32 *reg_offset,
> +					u32 *bit_pos)
> +{
> +	*reg_offset = offset % 8;
> +	*bit_pos = offset>>  3;
> +}
> +
> +u32 ks_dw_pcie_get_msi_data(struct pcie_port *pp)
> +{
> +	struct keystone_pcie *ks_pcie = to_keystone_pcie(pp);
> +
> +	return ks_pcie->app.start + MSI_IRQ;
> +}
> +
> +void ks_dw_pcie_handle_msi_irq(struct keystone_pcie *ks_pcie , int offset)
> +{
> +	struct pcie_port *pp =&ks_pcie->pp;
> +	u32 pending, vector;
> +	int src, virq;
> +
> +	pending = readl(ks_pcie->va_app_base + MSI0_IRQ_STATUS + (offset<<  4));
> +	/*
> +	 * MSI0, Status bit 0-3 shows vectors 0, 8, 16, 24, MSI1 status bit
> +	 * shows 1, 9, 17, 25 and so forth
> +	 */
> +	for (src = 0; src<  4; src++) {
> +		if (BIT(src)&  pending) {
> +			vector = offset + (src<<  3);
> +			virq = irq_linear_revmap(pp->irq_domain, vector);
> +			dev_dbg(pp->dev,
> +				"irq: bit %d, vector %d, virq %d\n",
> +				 src, vector, virq);
> +			generic_handle_irq(virq);
> +		}
> +	}
> +}
> +
> +static void ks_dw_pcie_msi_irq_ack(struct irq_data *d)
> +{
> +	u32 offset, reg_offset, bit_pos;
> +	struct keystone_pcie *ks_pcie;
> +	unsigned int irq = d->irq;
> +	struct msi_desc *msi;
> +	struct pcie_port *pp;
> +
> +	msi = irq_get_msi_desc(irq);
> +	pp = sys_to_pcie(msi->dev->bus->sysdata);
> +	ks_pcie = to_keystone_pcie(pp);
> +	offset = irq - irq_linear_revmap(pp->irq_domain, 0);
> +	update_reg_offset_bit_pos(offset,&reg_offset,&bit_pos);
> +
> +	writel(BIT(bit_pos),
> +		ks_pcie->va_app_base + MSI0_IRQ_STATUS + (reg_offset<<  4));
> +	writel(reg_offset + MSI_IRQ_OFFSET, ks_pcie->va_app_base + IRQ_EOI);
> +}
> +
> +void ks_dw_pcie_msi_set_irq(struct pcie_port *pp, int irq)
> +{
> +	u32 reg_offset, bit_pos;
> +	struct keystone_pcie *ks_pcie = to_keystone_pcie(pp);
> +
> +	update_reg_offset_bit_pos(irq,&reg_offset,&bit_pos);
> +	writel(BIT(bit_pos),
> +		ks_pcie->va_app_base + MSI0_IRQ_ENABLE_SET + (reg_offset<<  4));
> +}
> +
> +void ks_dw_pcie_msi_clear_irq(struct pcie_port *pp, int irq)
> +{
> +	u32 reg_offset, bit_pos;
> +	struct keystone_pcie *ks_pcie = to_keystone_pcie(pp);
> +
> +	update_reg_offset_bit_pos(irq,&reg_offset,&bit_pos);
> +	writel(BIT(bit_pos),
> +		ks_pcie->va_app_base + MSI0_IRQ_ENABLE_CLR + (reg_offset<<  4));
> +}
> +
> +static void ks_dw_pcie_msi_irq_mask(struct irq_data *d)
> +{
> +	struct keystone_pcie *ks_pcie;
> +	unsigned int irq = d->irq;
> +	struct msi_desc *msi;
> +	struct pcie_port *pp;
> +	u32 offset;
> +
> +	msi = irq_get_msi_desc(irq);
> +	pp = sys_to_pcie(msi->dev->bus->sysdata);
> +	ks_pcie = to_keystone_pcie(pp);
> +	offset = irq - irq_linear_revmap(pp->irq_domain, 0);
> +
> +	/* mask the end point if PVM implemented */
> +	if (IS_ENABLED(CONFIG_PCI_MSI)) {
> +		if (msi->msi_attrib.maskbit)
> +			mask_msi_irq(d);
> +	}
> +
> +	ks_dw_pcie_msi_clear_irq(pp, offset);
> +}
> +
> +static void ks_dw_pcie_msi_irq_unmask(struct irq_data *d)
> +{
> +	struct keystone_pcie *ks_pcie;
> +	unsigned int irq = d->irq;
> +	struct msi_desc *msi;
> +	struct pcie_port *pp;
> +	u32 offset;
> +
> +	msi = irq_get_msi_desc(irq);
> +	pp = sys_to_pcie(msi->dev->bus->sysdata);
> +	ks_pcie = to_keystone_pcie(pp);
> +	offset = irq - irq_linear_revmap(pp->irq_domain, 0);
> +
> +	/* mask the end point if PVM implemented */
> +	if (IS_ENABLED(CONFIG_PCI_MSI)) {
> +		if (msi->msi_attrib.maskbit)
> +			unmask_msi_irq(d);
> +	}
> +
> +	ks_dw_pcie_msi_set_irq(pp, offset);
> +}
> +
> +static struct irq_chip ks_dw_pcie_msi_irq_chip = {
> +	.name = "Keystone-PCIe-MSI-IRQ",
> +	.irq_ack = ks_dw_pcie_msi_irq_ack,
> +	.irq_mask = ks_dw_pcie_msi_irq_mask,
> +	.irq_unmask = ks_dw_pcie_msi_irq_unmask,
> +};
> +
> +static int ks_dw_pcie_msi_map(struct irq_domain *domain, unsigned int irq,
> +			irq_hw_number_t hwirq)
> +{
> +	irq_set_chip_and_handler(irq,&ks_dw_pcie_msi_irq_chip,
> +				 handle_level_irq);
> +	irq_set_chip_data(irq, domain->host_data);
> +	set_irq_flags(irq, IRQF_VALID);
> +
> +	return 0;
> +}
> +
> +const struct irq_domain_ops ks_dw_pcie_msi_domain_ops = {
> +	.map = ks_dw_pcie_msi_map,
> +};
> +
> +int ks_dw_pcie_msi_host_init(struct pcie_port *pp,
> +					struct msi_chip *chip)
> +{
> +	struct keystone_pcie *ks_pcie = to_keystone_pcie(pp);
> +	int i;
> +
> +	pp->irq_domain = irq_domain_add_linear(ks_pcie->msi_intc_np,
> +					MAX_MSI_IRQS,
> +					&ks_dw_pcie_msi_domain_ops,
> +					chip);
> +	if (!pp->irq_domain) {
> +		dev_err(pp->dev, "irq domain init failed\n");
> +		return -ENXIO;
> +	}
> +
> +	for (i = 0; i<  MAX_MSI_IRQS; i++)
> +		irq_create_mapping(pp->irq_domain, i);
> +
> +	return 0;
> +}
> +
> +void ks_dw_pcie_enable_legacy_irqs(struct keystone_pcie *ks_pcie)
> +{
> +	int i;
> +
> +	for (i = 0; i<  MAX_LEGACY_IRQS; i++)
> +		writel(0x1, ks_pcie->va_app_base + IRQ_ENABLE_SET + (i<<  4));
> +}
> +
> +void ks_dw_pcie_handle_legacy_irq(struct keystone_pcie *ks_pcie, int offset)
> +{
> +	struct pcie_port *pp =&ks_pcie->pp;
> +	u32 pending;
> +	int virq;
> +
> +	pending = readl(ks_pcie->va_app_base + IRQ_STATUS + (offset<<  4));
> +
> +	if (BIT(0)&  pending) {
> +		virq = irq_linear_revmap(ks_pcie->legacy_irq_domain, offset);
> +		dev_dbg(pp->dev,
> +			": irq: irq_offset %d, virq %d\n", offset, virq);
> +		generic_handle_irq(virq);
> +	}
> +
> +	/* EOI the INTx interrupt */
> +	writel(offset, ks_pcie->va_app_base + IRQ_EOI);
> +}
> +
> +static void ks_dw_pcie_ack_legacy_irq(struct irq_data *d)
> +{
> +}
> +
> +static void ks_dw_pcie_mask_legacy_irq(struct irq_data *d)
> +{
> +}
> +
> +static void ks_dw_pcie_unmask_legacy_irq(struct irq_data *d)
> +{
> +}
> +
> +static struct irq_chip ks_dw_pcie_legacy_irq_chip = {
> +	.name = "Keystone-PCI-Legacy-IRQ",
> +	.irq_ack = ks_dw_pcie_ack_legacy_irq,
> +	.irq_mask = ks_dw_pcie_mask_legacy_irq,
> +	.irq_unmask = ks_dw_pcie_unmask_legacy_irq,
> +};
> +
> +static int ks_dw_pcie_init_legacy_irq_map(struct irq_domain *d,
> +				unsigned int irq, irq_hw_number_t hw_irq)
> +{
> +	irq_set_chip_and_handler(irq,&ks_dw_pcie_legacy_irq_chip,
> +				handle_level_irq);
> +	irq_set_chip_data(irq, d->host_data);
> +	set_irq_flags(irq, IRQF_VALID);
> +
> +	return 0;
> +}
> +
> +static const struct irq_domain_ops ks_dw_pcie_legacy_irq_domian_ops = {
> +	.map = ks_dw_pcie_init_legacy_irq_map,
> +	.xlate = irq_domain_xlate_onetwocell,
> +};
> +
> +/**
> + * ks_dw_pcie_set_dbi_mode() - Set DBI mode to access overlaid BAR mask registers
> + *
> + * Since modification of dbi_cs2 involves different clock domain, read the
> + * status back to ensure the transition is complete.
> + */
> +static void ks_dw_pcie_set_dbi_mode(void __iomem *reg_virt)
> +{
> +	u32 val;
> +
> +	writel(DBI_CS2_EN_VAL | readl(reg_virt + CMD_STATUS),
> +		     reg_virt + CMD_STATUS);
> +
> +	do {
> +		val = readl(reg_virt + CMD_STATUS);
> +	} while (!(val&  DBI_CS2_EN_VAL));
> +}
> +
> +/**
> + * ks_dw_pcie_clear_dbi_mode() - Disable DBI mode
> + *
> + * Since modification of dbi_cs2 involves different clock domain, read the
> + * status back to ensure the transition is complete.
> + */
> +static void ks_dw_pcie_clear_dbi_mode(void __iomem *reg_virt)
> +{
> +	u32 val;
> +
> +	writel(~DBI_CS2_EN_VAL&  readl(reg_virt + CMD_STATUS),
> +		     reg_virt + CMD_STATUS);
> +
> +	do {
> +		val = readl(reg_virt + CMD_STATUS);
> +	} while (val&  DBI_CS2_EN_VAL);
> +}
> +
> +void ks_dw_pcie_setup_rc_app_regs(struct keystone_pcie *ks_pcie)
> +{
> +	struct pcie_port *pp =&ks_pcie->pp;
> +	u32 start = pp->mem.start, end = pp->mem.end;
> +	int i, tr_size;
> +
> +	/* disable BARS for inbound access */
> +	ks_dw_pcie_set_dbi_mode(ks_pcie->va_app_base);
> +	writel(0, pp->dbi_base + PCI_BASE_ADDRESS_0);
> +	writel(0, pp->dbi_base + PCI_BASE_ADDRESS_1);
> +	ks_dw_pcie_clear_dbi_mode(ks_pcie->va_app_base);
> +
> +	/* Set outbound translation size per window division */
> +	writel(CFG_PCIM_WIN_SZ_IDX&  0x7, ks_pcie->va_app_base + OB_SIZE);
> +
> +	tr_size = (1<<  (CFG_PCIM_WIN_SZ_IDX&  0x7)) * SZ_1M;
> +
> +	/* Using Direct 1:1 mapping of RC<->  PCI memory space */
> +	for (i = 0; (i<  CFG_PCIM_WIN_CNT)&&  (start<  end); i++) {
> +		writel(start | 1, ks_pcie->va_app_base + OB_OFFSET_INDEX(i));
> +		writel(0, ks_pcie->va_app_base + OB_OFFSET_HI(i));
> +		start += tr_size;
> +	}
> +
> +	/* Enable OB translation */
> +	writel(OB_XLAT_EN_VAL | readl(ks_pcie->va_app_base + CMD_STATUS),
> +		ks_pcie->va_app_base + CMD_STATUS);
> +}
> +
> +/**
> + * 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 pcie_port *pp =&ks_pcie->pp;
> +	u32 regval;
> +
> +	if (bus == 0)
> +		return pp->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);
> +
> +	writel(regval, ks_pcie->va_app_base + CFG_SETUP);
> +	return pp->va_cfg0_base;
> +}
> +
> +int ks_dw_pcie_rd_other_conf(struct pcie_port *pp, struct pci_bus *bus,
> +		unsigned int devfn, int where, int size, u32 *val)
> +{
> +	struct keystone_pcie *ks_pcie = to_keystone_pcie(pp);
> +	u8 bus_num = bus->number;
> +	void __iomem *addr;
> +	int ret;
> +
> +	addr = ks_pcie_cfg_setup(ks_pcie, bus_num, devfn);
> +	ret = dw_pcie_cfg_read(addr + (where&  ~0x3), where, size, val);
> +
> +	return ret;
> +}
> +
> +int ks_dw_pcie_wr_other_conf(struct pcie_port *pp,
> +		struct pci_bus *bus, unsigned int devfn, int where,
> +		int size, u32 val)
> +{
> +	struct keystone_pcie *ks_pcie = to_keystone_pcie(pp);
> +	u8 bus_num = bus->number;
> +	void __iomem *addr;
> +
> +	addr = ks_pcie_cfg_setup(ks_pcie, bus_num, devfn);
> +
> +	return dw_pcie_cfg_write(addr + (where&  ~0x3), where, size, val);
> +}
> +
> +/**
> + * ks_dw_pcie_v3_65_scan_bus() - keystone scan_bus post initialization
> + *
> + * This sets BAR0 to enable inbound access for MSI_IRQ register
> + */
> +void ks_dw_pcie_v3_65_scan_bus(struct pcie_port *pp)
> +{
> +	struct keystone_pcie *ks_pcie = to_keystone_pcie(pp);
> +
> +	/* Configure and set up BAR0 */
> +	ks_dw_pcie_set_dbi_mode(ks_pcie->va_app_base);
> +
> +	/* Enable BAR0 */
> +	writel(1, pp->dbi_base + PCI_BASE_ADDRESS_0);
> +	writel(SZ_4K - 1, pp->dbi_base + PCI_BASE_ADDRESS_0);
> +
> +	ks_dw_pcie_clear_dbi_mode(ks_pcie->va_app_base);
> +
> +	 /*
> +	  * For BAR0, just setting bus address for inbound writes (MSI) should
> +	  * be sufficient. Use physical address to avoid any conflicts.
> +	  */
> +	writel(ks_pcie->app.start, pp->dbi_base + PCI_BASE_ADDRESS_0);
> +}
> +
> +/**
> + * ks_dw_pcie_link_up() - Check if link up
> + *
> + */
> +int ks_dw_pcie_link_up(struct pcie_port *pp)
> +{
> +	u32 val = readl(pp->dbi_base + DEBUG0);
> +
> +	return (val&  LTSSM_STATE_MASK) == LTSSM_STATE_L0;
> +}
> +
> +void ks_dw_pcie_initiate_link_train(struct keystone_pcie *ks_pcie)
> +{
> +	u32 val;
> +
> +	/* Initiate Link Training.  */
> +	val = readl(ks_pcie->va_app_base + CMD_STATUS);
> +	writel(LTSSM_EN_VAL | val,  ks_pcie->va_app_base + CMD_STATUS);
> +}
> +
> +/**
> + * ks_dw_pcie_host_init() - initialize host for v3_65 dw hardware
> + *
> + * It ioremap the register resources, initialize legacy irq domain
> + * and then call dw_pcie_v3_65_host_init() API to intialize the Keystone
> + * PCI host controller.
> + *
> + */
> +int __init ks_dw_pcie_host_init(struct keystone_pcie *ks_pcie,
> +				struct device_node *msi_intc_np)
> +{
> +	struct pcie_port *pp =&ks_pcie->pp;
> +	struct platform_device *pdev = to_platform_device(pp->dev);
> +	struct resource *res;
> +
> +	/* index 0 is the config reg. space address */
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	pp->dbi_base = devm_ioremap_resource(pp->dev, res);
> +	if (IS_ERR(pp->dbi_base))
> +		return PTR_ERR(pp->dbi_base);
> +
> +	/*
> +	 * we set these same and is used in pcie rd/wr_other_conf
> +	 * functions
> +	 */
> +	pp->va_cfg0_base = pp->dbi_base + SPACE0_REMOTE_CFG_OFFSET;
> +	pp->va_cfg1_base = pp->va_cfg0_base;
> +
> +	/* index 1 is the application reg. space address */
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
> +	ks_pcie->app = *res;
> +	ks_pcie->va_app_base = devm_ioremap_resource(pp->dev, res);
> +	if (IS_ERR(ks_pcie->va_app_base))
> +		return PTR_ERR(ks_pcie->va_app_base);
> +
> +	/* create legacy irq domain */
> +	ks_pcie->legacy_irq_domain =
> +			irq_domain_add_linear(ks_pcie->legacy_intc_np,
> +					MAX_LEGACY_IRQS,
> +					&ks_dw_pcie_legacy_irq_domian_ops,
> +					NULL);
> +	if (!ks_pcie->legacy_irq_domain) {
> +		dev_err(pp->dev, "Failed to add irq domain for legacy irqs\n");
> +		return -EINVAL;
> +	}
> +
> +	return dw_pcie_host_init(pp);
> +}
> diff --git a/drivers/pci/host/pci-keystone.c b/drivers/pci/host/pci-keystone.c
> new file mode 100644
> index 0000000..341ced8
> --- /dev/null
> +++ b/drivers/pci/host/pci-keystone.c
> @@ -0,0 +1,385 @@
> +/*
> + * PCIe host controller driver for Texas Instruments Keystone SoCs
> + *
> + * Copyright (C) 2013-2014 Texas Instruments., Ltd.
> + *		http://www.ti.com
> + *
> + * Author: Murali Karicheri<m-karicheri2@ti.com>
> + * Implementation based on pci-exynos.c and pcie-designware.c
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#include<linux/irqchip/chained_irq.h>
> +#include<linux/clk.h>
> +#include<linux/delay.h>
> +#include<linux/irqdomain.h>
> +#include<linux/module.h>
> +#include<linux/msi.h>
> +#include<linux/of_irq.h>
> +#include<linux/of.h>
> +#include<linux/of_pci.h>
> +#include<linux/platform_device.h>
> +#include<linux/phy/phy.h>
> +#include<linux/resource.h>
> +#include<linux/signal.h>
> +
> +#include "pcie-designware.h"
> +#include "pci-keystone.h"
> +
> +#define DRIVER_NAME	"keystone-pcie"
> +
> +/* driver specific constants */
> +#define MAX_MSI_HOST_IRQS		8
> +#define MAX_LEGACY_HOST_IRQS		4
> +
> +/* RC mode settings masks */
> +#define PCIE_RC_MODE		BIT(2)
> +#define PCIE_MODE_MASK		(BIT(1) | BIT(2))
> +
> +/* DEV_STAT_CTRL */
> +#define PCIE_CAP_BASE		0x70
> +
> +#define to_keystone_pcie(x)	container_of(x, struct keystone_pcie, pp)
> +
> +static int ks_pcie_establish_link(struct keystone_pcie *ks_pcie)
> +{
> +	struct pcie_port *pp =&ks_pcie->pp;
> +	int count = 200;
> +
> +	dw_pcie_setup_rc(pp);
> +	if (ks_pcie->link_train)
> +		ks_dw_pcie_initiate_link_train(ks_pcie);
> +
> +	/* check if the link is up or not */
> +	while (!dw_pcie_link_up(pp)) {
> +		usleep_range(100, 1000);
> +		if (--count)
> +			continue;
> +		dev_err(pp->dev, "phy link never came up\n");
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +}
> +
> +static void ks_pcie_msi_irq_handler(unsigned int irq, struct irq_desc *desc)
> +{
> +	struct keystone_pcie *ks_pcie = irq_desc_get_handler_data(desc);
> +	u32 offset = irq - ks_pcie->msi_host_irqs[0];
> +	struct pcie_port *pp =&ks_pcie->pp;
> +	struct irq_chip *chip = irq_desc_get_chip(desc);
> +
> +	dev_dbg(pp->dev, "ks_pci_msi_irq_handler, irq %d\n", irq);
> +
> +	/*
> +	 * The chained irq handler installation would have replaced normal
> +	 * interrupt driver handler so we need to take care of mask/unmask and
> +	 * ack operation.
> +	 */
> +	chained_irq_enter(chip, desc);
> +	ks_dw_pcie_handle_msi_irq(ks_pcie, offset);
> +	chained_irq_exit(chip, desc);
> +}
> +
> +/**
> + * ks_pcie_legacy_irq_handler() - Handle legacy interrupt
> + * @irq: IRQ line for legacy interrupts
> + * @desc: Pointer to irq descriptor
> + *
> + * Traverse through pending legacy interrupts and invoke handler for each. Also
> + * takes care of interrupt controller level mask/ack operation.
> + */
> +static void ks_pcie_legacy_irq_handler(unsigned int irq, struct irq_desc *desc)
> +{
> +	struct keystone_pcie *ks_pcie = irq_desc_get_handler_data(desc);
> +	struct pcie_port *pp =&ks_pcie->pp;
> +	u32 irq_offset = irq - ks_pcie->legacy_host_irqs[0];
> +	struct irq_chip *chip = irq_desc_get_chip(desc);
> +
> +	dev_dbg(pp->dev, ": Handling legacy irq %d\n", irq);
> +
> +	/*
> +	 * The chained irq handler installation would have replaced normal
> +	 * interrupt driver handler so we need to take care of mask/unmask and
> +	 * ack operation.
> +	 */
> +	chained_irq_enter(chip, desc);
> +	ks_dw_pcie_handle_legacy_irq(ks_pcie, irq_offset);
> +	chained_irq_exit(chip, desc);
> +}
> +
> +static int ks_pcie_get_irq_controller_info(struct keystone_pcie *ks_pcie,
> +					   char *controller, int *num_irqs)
> +{
> +	int temp, max_host_irqs, legacy = 1, *host_irqs, ret = -EINVAL;
> +	struct device *dev = ks_pcie->pp.dev;
> +	struct device_node *np_pcie = dev->of_node, **np_temp;
> +
> +	if (!strcmp(controller, "msi-interrupt-controller"))
> +		legacy = 0;
> +
> +	if (legacy) {
> +		np_temp =&ks_pcie->legacy_intc_np;
> +		max_host_irqs = MAX_LEGACY_HOST_IRQS;
> +		host_irqs =&ks_pcie->legacy_host_irqs[0];
> +	} else {
> +		np_temp =&ks_pcie->msi_intc_np;
> +		max_host_irqs = MAX_MSI_HOST_IRQS;
> +		host_irqs =&ks_pcie->msi_host_irqs[0];
> +	}
> +
> +	/* interrupt controller is in a child node */
> +	*np_temp = of_find_node_by_name(np_pcie, controller);
> +	if (!(*np_temp)) {
> +		dev_err(dev, "Node for %s is absent\n", controller);
> +		goto out;
> +	}
> +	temp = of_irq_count(*np_temp);
> +	if (!temp)
> +		goto out;
> +	if (temp>  max_host_irqs)
> +		dev_warn(dev, "Too many %s interrupts defined %u\n",
> +			(legacy ? "legacy" : "MSI"), temp);
> +
> +	/*
> +	 * support upto max_host_irqs. In dt from index 0 to 3 (legacy) or 0 to
> +	 * 7 (MSI)
> +	 */
> +	for (temp = 0; temp<  max_host_irqs; temp++) {
> +		host_irqs[temp] = irq_of_parse_and_map(*np_temp, temp);
> +		if (host_irqs[temp]<  0)
> +			break;
> +	}
> +	if (temp) {
> +		*num_irqs = temp;
> +		ret = 0;
> +	}
> +out:
> +	return ret;
> +}
> +
> +static void ks_pcie_setup_interrupts(struct keystone_pcie *ks_pcie)
> +{
> +	int i;
> +
> +	/* Legacy IRQ */
> +	for (i = 0; i<  ks_pcie->num_legacy_host_irqs; i++) {
> +		irq_set_handler_data(ks_pcie->legacy_host_irqs[i], ks_pcie);
> +		irq_set_chained_handler(ks_pcie->legacy_host_irqs[i],
> +					ks_pcie_legacy_irq_handler);
> +	}
> +	ks_dw_pcie_enable_legacy_irqs(ks_pcie);
> +
> +	/* MSI IRQ */
> +	if (IS_ENABLED(CONFIG_PCI_MSI)) {
> +		for (i = 0; i<  ks_pcie->num_msi_host_irqs; i++) {
> +			irq_set_chained_handler(ks_pcie->msi_host_irqs[i],
> +						ks_pcie_msi_irq_handler);
> +			irq_set_handler_data(ks_pcie->msi_host_irqs[i],
> +					     ks_pcie);
> +		}
> +	}
> +}
> +
> +/*
> + * When a PCI device does not exist during config cycles, keystone host gets a
> + * bus error instead of returning 0xffffffff. This handler always returns 0
> + * for this kind of faults.
> + */
> +static int keystone_pcie_fault(unsigned long addr, unsigned int fsr,
> +				struct pt_regs *regs)
> +{
> +	unsigned long instr = *(unsigned long *) instruction_pointer(regs);
> +
> +	if ((instr&  0x0e100090) == 0x00100090) {
> +		int reg = (instr>>  12)&  15;
> +
> +		regs->uregs[reg] = -1;
> +		regs->ARM_pc += 4;
> +	}
> +
> +	return 0;
> +}
> +
> +static void __init ks_pcie_host_init(struct pcie_port *pp)
> +{
> +	u32 vendor_device_id, val;
> +	struct keystone_pcie *ks_pcie = to_keystone_pcie(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),
> +			pp->dbi_base + PCI_IO_BASE);
> +
> +	/* update the Vendor ID */
> +	vendor_device_id = readl(ks_pcie->va_reg_pciid);
> +	writew((vendor_device_id>>  16), pp->dbi_base + PCI_DEVICE_ID);
> +
> +	/* update the DEV_STAT_CTRL to publish right mrrs */
> +	val = readl(pp->dbi_base + PCIE_CAP_BASE + PCI_EXP_DEVCTL);
> +	val&= ~PCI_EXP_DEVCTL_READRQ;
> +	/* set the mrrs to 256 bytes */
> +	val |= BIT(12);
> +	writel(val, pp->dbi_base + PCIE_CAP_BASE + PCI_EXP_DEVCTL);
> +
> +	/*
> +	 * PCIe access errors that result into OCP errors are caught by ARM as
> +	 * "External aborts"
> +	 */
> +	hook_fault_code(17, keystone_pcie_fault, SIGBUS, 0,
> +			"Asynchronous external abort");
> +}
> +
> +static struct pcie_host_ops keystone_pcie_host_ops = {
> +	.rd_other_conf = ks_dw_pcie_rd_other_conf,
> +	.wr_other_conf = ks_dw_pcie_wr_other_conf,
> +	.link_up = ks_dw_pcie_link_up,
> +	.host_init = ks_pcie_host_init,
> +	.msi_set_irq = ks_dw_pcie_msi_set_irq,
> +	.msi_clear_irq = ks_dw_pcie_msi_clear_irq,
> +	.get_msi_data = ks_dw_pcie_get_msi_data,
> +	.msi_host_init = ks_dw_pcie_msi_host_init,
> +	.scan_bus = ks_dw_pcie_v3_65_scan_bus,
> +};
> +
> +static int __init ks_add_pcie_port(struct keystone_pcie *ks_pcie,
> +			 struct platform_device *pdev)
> +{
> +	struct pcie_port *pp =&ks_pcie->pp;
> +	int ret;
> +
> +	ret = ks_pcie_get_irq_controller_info(ks_pcie,
> +					"legacy-interrupt-controller",
> +					&ks_pcie->num_legacy_host_irqs);
> +	if (ret)
> +		return ret;
> +
> +	if (IS_ENABLED(CONFIG_PCI_MSI)) {
> +		ret = ks_pcie_get_irq_controller_info(ks_pcie,
> +						"msi-interrupt-controller",
> +						&ks_pcie->num_msi_host_irqs);
> +		if (ret)
> +			return ret;
> +	}
> +
> +	pp->root_bus_nr = -1;
> +	pp->ops =&keystone_pcie_host_ops;
> +	ret = ks_dw_pcie_host_init(ks_pcie, ks_pcie->msi_intc_np);
> +	if (ret) {
> +		dev_err(&pdev->dev, "failed to initialize host\n");
> +		return ret;
> +	}
> +
> +	return ret;
> +}
> +
> +static const struct of_device_id ks_pcie_of_match[] = {
> +	{
> +		.type = "pci",
> +		.compatible = "ti,keystone-pcie",
> +	},
> +	{ },
> +};
> +MODULE_DEVICE_TABLE(of, ks_pcie_of_match);
> +
> +static int __exit ks_pcie_remove(struct platform_device *pdev)
> +{
> +	struct keystone_pcie *ks_pcie = platform_get_drvdata(pdev);
> +
> +	clk_disable_unprepare(ks_pcie->clk);
> +
> +	return 0;
> +}
> +
> +static int __init ks_pcie_probe(struct platform_device *pdev)
> +{
> +	struct device_node *np = pdev->dev.of_node;
> +	struct device *dev =&pdev->dev;
> +	struct keystone_pcie *ks_pcie;
> +	struct pcie_port *pp;
> +	struct resource *res;
> +	void __iomem *reg_p;
> +	struct phy *phy;
> +	int ret = 0;
> +	u32 val;
> +
> +	ks_pcie = devm_kzalloc(&pdev->dev, sizeof(*ks_pcie),
> +				GFP_KERNEL);
> +	if (!ks_pcie) {
> +		dev_err(dev, "no memory for keystone pcie\n");
> +		return -ENOMEM;
> +	}
> +	pp =&ks_pcie->pp;
> +
> +	/* initialize SerDes Phy if present */
> +	phy = devm_phy_get(dev, "pcie-phy");
> +	if (!IS_ERR_OR_NULL(phy)) {
> +		ret = phy_init(phy);
> +		if (ret<  0)
> +			return ret;
> +	}
> +
> +	/* index 2 is the devcfg register for RC mode settings */
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
> +	reg_p = devm_ioremap_resource(dev, res);
> +	if (IS_ERR(reg_p))
> +		return PTR_ERR(reg_p);
> +
> +	/* enable RC mode in devcfg */
> +	val = readl(reg_p);
> +	val&= ~PCIE_MODE_MASK;
> +	val |= PCIE_RC_MODE;
> +	writel(val, reg_p);
> +
> +	/* index 3 is to read PCI DEVICE_ID */
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 3);
> +	reg_p = devm_ioremap_resource(dev, res);
> +	if (IS_ERR(reg_p))
> +		return PTR_ERR(reg_p);
> +	ks_pcie->va_reg_pciid = reg_p;
> +
> +	/* check if we need to enable link training */
> +	ks_pcie->link_train =
> +		(of_get_property(np, "ti,enable-linktrain", NULL) != NULL);
> +
> +	pp->dev = dev;
> +	platform_set_drvdata(pdev, ks_pcie);
> +	ks_pcie->clk = devm_clk_get(dev, "pcie");
> +	if (IS_ERR(ks_pcie->clk)) {
> +		dev_err(dev, "Failed to get pcie rc clock\n");
> +		return PTR_ERR(ks_pcie->clk);
> +	}
> +	ret = clk_prepare_enable(ks_pcie->clk);
> +	if (ret)
> +		return ret;
> +
> +	ret = ks_add_pcie_port(ks_pcie, pdev);
> +	if (ret<  0)
> +		goto fail_clk;
> +
> +	return 0;
> +fail_clk:
> +	clk_disable_unprepare(ks_pcie->clk);
> +
> +	return ret;
> +}
> +
> +static struct platform_driver ks_pcie_driver __refdata = {
> +	.probe  = ks_pcie_probe,
> +	.remove = __exit_p(ks_pcie_remove),
> +	.driver = {
> +		.name	= "keystone-pcie",
> +		.owner	= THIS_MODULE,
> +		.of_match_table = of_match_ptr(ks_pcie_of_match),
> +	},
> +};
> +
> +module_platform_driver(ks_pcie_driver);
> +
> +MODULE_AUTHOR("Murali Karicheri<m-karicheri2@ti.com>");
> +MODULE_DESCRIPTION("Keystone PCIe host controller driver");
> +MODULE_LICENSE("GPL v2");
> diff --git a/drivers/pci/host/pci-keystone.h b/drivers/pci/host/pci-keystone.h
> new file mode 100644
> index 0000000..0bedfc5
> --- /dev/null
> +++ b/drivers/pci/host/pci-keystone.h
> @@ -0,0 +1,59 @@
> +/*
> + * Keystone PCI Controller's common includes
> + *
> + * Copyright (C) 2013-2014 Texas Instruments., Ltd.
> + *		http://www.ti.com
> + *
> + * Author: Murali Karicheri<m-karicheri2@ti.com>
> + *
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#define MAX_LEGACY_IRQS			4
> +#define MAX_MSI_HOST_IRQS		8
> +#define MAX_LEGACY_HOST_IRQS		4
> +
> +struct keystone_pcie {
> +	struct	clk		*clk;
> +	int			link_train;
> +	struct	pcie_port	pp;
> +	void __iomem		*va_reg_pciid;
> +
> +	int			num_legacy_host_irqs;
> +	int			legacy_host_irqs[MAX_LEGACY_HOST_IRQS];
> +	struct			device_node *legacy_intc_np;
> +
> +	int			num_msi_host_irqs;
> +	int			msi_host_irqs[MAX_MSI_HOST_IRQS];
> +	struct			device_node *msi_intc_np;
> +	struct irq_domain	*legacy_irq_domain;
> +
> +	/* Application register space */
> +	void __iomem		*va_app_base;
> +	struct resource		app;
> +};
> +
> +/* Keystone DW specific MSI controller APIs/definitions */
> +void ks_dw_pcie_handle_msi_irq(struct keystone_pcie *ks_pcie, int offset);
> +u32 ks_dw_pcie_get_msi_data(struct pcie_port *pp);
> +
> +/* Keystone specific PCI controller APIs */
> +void ks_dw_pcie_enable_legacy_irqs(struct keystone_pcie *ks_pcie);
> +void ks_dw_pcie_handle_legacy_irq(struct keystone_pcie *ks_pcie, int offset);
> +int  ks_dw_pcie_host_init(struct keystone_pcie *ks_pcie,
> +			struct device_node *msi_intc_np);
> +int ks_dw_pcie_wr_other_conf(struct pcie_port *pp, struct pci_bus *bus,
> +		unsigned int devfn, int where, int size, u32 val);
> +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);
> +int ks_dw_pcie_link_up(struct pcie_port *pp);
> +void ks_dw_pcie_initiate_link_train(struct keystone_pcie *ks_pcie);
> +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);
> +void ks_dw_pcie_v3_65_scan_bus(struct pcie_port *pp);
> +int ks_dw_pcie_msi_host_init(struct pcie_port *pp,
> +		struct msi_chip *chip);
Rob,

Could you please review the DT documentation of this patch and ack if 
looks good? I have all the Acks needed to merge this series, but DT
maintainers ack is missing

Thanks and regards,

Murali