diff mbox

[v7,4/5] PCI: add PCI controller for keystone PCIe h/w

Message ID 1405961925-27248-5-git-send-email-m-karicheri2@ti.com (mailing list archive)
State New, archived
Delegated to: Bjorn Helgaas
Headers show

Commit Message

Murali Karicheri July 21, 2014, 4:58 p.m. UTC
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: 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: Jingoo Han <jg1.han@samsung.com>
CC: Bjorn Helgaas <bhelgaas@google.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       |   68 +++
 drivers/pci/host/Kconfig                           |    5 +
 drivers/pci/host/Makefile                          |    1 +
 drivers/pci/host/pci-keystone-dw.c                 |  521 ++++++++++++++++++++
 drivers/pci/host/pci-keystone.c                    |  386 +++++++++++++++
 drivers/pci/host/pci-keystone.h                    |   58 +++
 6 files changed, 1039 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

Comments

Bjorn Helgaas July 22, 2014, 10:35 p.m. UTC | #1
On Mon, Jul 21, 2014 at 12:58:44PM -0400, 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>
> ...

> +++ b/Documentation/devicetree/bindings/pci/pci-keystone.txt
> ...

> +Note for PCI driver usage
> +=========================
> +Driver requires pci=pcie_bus_perf in the bootargs for proper functioning.

Whoa, why is this?  Special boot args should not be required.

> 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

It'd be nice to have some help text here.  I know, not everybody else does.

> +++ b/drivers/pci/host/pci-keystone-dw.c
> ...
> +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));

Blank line here (before the block comment).

> +	/*
> +	 * 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 __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);

This *looks* like it needs a lock to protect against concurrent
ks_pcie_cfg_setup() users, since it writes a register.

> +
> +	return ret;

Please use the same style as in ks_dw_pcie_wr_other_conf(), i.e., get rid
of "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);
> +}

> +++ b/drivers/pci/host/pci-keystone.c
> ...

> +static struct platform_driver ks_pcie_driver __refdata = {

Why does this need to be __refdata?  There are no other occurrences in
drivers/pci.

> +	.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),
> +	},
> +};

Bjorn
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Murali Karicheri July 22, 2014, 10:52 p.m. UTC | #2
Bjorn,

On 07/22/2014 06:35 PM, Bjorn Helgaas wrote:
> On Mon, Jul 21, 2014 at 12:58:44PM -0400, 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>
>> ...
>
>> +++ b/Documentation/devicetree/bindings/pci/pci-keystone.txt
>> ...
>
>> +Note for PCI driver usage
>> +=========================
>> +Driver requires pci=pcie_bus_perf in the bootargs for proper functioning.
>
> Whoa, why is this?  Special boot args should not be required.

This was discussed initially and I had added following commit to get 
this working instead of a PCI quirk. To get some background please see 
the thread for commit below that you also had signed off as well.

commit 8b5742ad156d30ee38486652cdbd152e2d6ebbcc
Author: Murali Karicheri <m-karicheri2@ti.com>
Date:   Wed May 28 13:14:53 2014 -0400

     ARM/PCI: Call pcie_bus_configure_settings() to set MPS

     Call pcie_bus_configure_settings() on ARM, like for other platforms.
     pcie_bus_configure_settings() makes sure the MPS across the bus is 
uniform
     and provides the ability to tune the MRSS and MPS to higher performance
     values.  This is particularly important for embedded where there is no
     firmware to program these PCIe settings for the OS.

     Signed-off-by: Murali Karicheri <m-karicheri2@ti.com>
     Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
     CC: Russell King <linux@arm.linux.org.uk>
     CC: Arnd Bergmann <arnd@arndb.de>
     CC: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
     CC: Santosh Shilimkar <santosh.shilimkar@ti.com>

This was added as a preparatory patch to support keystone and
avoid a PCI quirk to do the same. Keystone has MRSS limitation
of 256 bytes. So adding a bootargs flag was suggested a better option 
than a PCI quirk.

I will look into the rest of the comments and possibly try to address 
them or discuss.

BTW, please apply patch 1-3 that has already got ack from maintainers
and is indepdent of this patch.

Thanks

Murali

>
>> 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
>
> It'd be nice to have some help text here.  I know, not everybody else does.
>
>> +++ b/drivers/pci/host/pci-keystone-dw.c
>> ...
>> +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));
>
> Blank line here (before the block comment).
>
>> +	/*
>> +	 * 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 __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);
>
> This *looks* like it needs a lock to protect against concurrent
> ks_pcie_cfg_setup() users, since it writes a register.
>
>> +
>> +	return ret;
>
> Please use the same style as in ks_dw_pcie_wr_other_conf(), i.e., get rid
> of "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);
>> +}
>
>> +++ b/drivers/pci/host/pci-keystone.c
>> ...
>
>> +static struct platform_driver ks_pcie_driver __refdata = {
>
> Why does this need to be __refdata?  There are no other occurrences in
> drivers/pci.
>
>> +	.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),
>> +	},
>> +};
>
> Bjorn

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Bjorn Helgaas July 22, 2014, 11:52 p.m. UTC | #3
On Tue, Jul 22, 2014 at 06:52:12PM -0400, Murali Karicheri wrote:
> Bjorn,
> 
> On 07/22/2014 06:35 PM, Bjorn Helgaas wrote:
> >On Mon, Jul 21, 2014 at 12:58:44PM -0400, 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>
> >>...
> >
> >>+++ b/Documentation/devicetree/bindings/pci/pci-keystone.txt
> >>...
> >
> >>+Note for PCI driver usage
> >>+=========================
> >>+Driver requires pci=pcie_bus_perf in the bootargs for proper functioning.
> >
> >Whoa, why is this?  Special boot args should not be required.
> 
> This was discussed initially and I had added following commit to get
> this working instead of a PCI quirk. To get some background please
> see the thread for commit below that you also had signed off as
> well.

I applied 8b5742ad156d because it's something all arches should do
(actually, we *should* do it in the PCI core, but nobody's gotten
around to doing that yet).  It has nothing to do with Keystone
support, and it doesn't mean I'm in favor of a boot argument.

I think the discussion you mentioned is [1].  I see hints that there
might be a Keystone hardware defect related to MRSS, but I don't see a
clear description of it.  If you have a hardware erratum document,
those usually contain pretty good descriptions.

If there is a hardware defect, a PCI quirk is a reasonable way to work
around it, since that's the main purpose of quirks.  fixup_mpss_256()
is an example of something that sounds superficially similar.

I don't think there's a way for a device to advertise the maximum MRSS
value it supports.  MRSS only controls the maximum Read Request size
the device can generate, and I wouldn't think there's much to go wrong
there, because the request doesn't contain any data, so MRSS doesn't
affect the packet size of the *request*.

I think it's more likely that a hardware problem would affect the
*response*, where, e.g., a device might advertise (via the Device
Capabilities Max_Payload_Size_Supported field) that it can support an
MPS of 1024, but it can't actually handle a TLP that big.  Software
would have to work around that by artificially limiting the MPS to
something smaller than the MPSS advertised by the device.  This is
what fixup_mpss_256() is doing.

If there is a hardware problem with MRSS specifically, you can
probably still do a quirk, but it might also involve a little work in
the PCI core to add something similar to pcie_mpss to support the
quirk.

Bjorn

[1] http://lkml.kernel.org/r/1400169692-9677-6-git-send-email-m-karicheri2@ti.com

> commit 8b5742ad156d30ee38486652cdbd152e2d6ebbcc
> Author: Murali Karicheri <m-karicheri2@ti.com>
> Date:   Wed May 28 13:14:53 2014 -0400
> 
>     ARM/PCI: Call pcie_bus_configure_settings() to set MPS
> 
>     Call pcie_bus_configure_settings() on ARM, like for other platforms.
>     pcie_bus_configure_settings() makes sure the MPS across the bus
> is uniform
>     and provides the ability to tune the MRSS and MPS to higher performance
>     values.  This is particularly important for embedded where there is no
>     firmware to program these PCIe settings for the OS.
> 
>     Signed-off-by: Murali Karicheri <m-karicheri2@ti.com>
>     Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
>     CC: Russell King <linux@arm.linux.org.uk>
>     CC: Arnd Bergmann <arnd@arndb.de>
>     CC: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
>     CC: Santosh Shilimkar <santosh.shilimkar@ti.com>
> 
> This was added as a preparatory patch to support keystone and
> avoid a PCI quirk to do the same. Keystone has MRSS limitation
> of 256 bytes. So adding a bootargs flag was suggested a better
> option than a PCI quirk.
> 
> I will look into the rest of the comments and possibly try to
> address them or discuss.
> 
> BTW, please apply patch 1-3 that has already got ack from maintainers
> and is indepdent of this patch.
> 
> Thanks
> 
> Murali
> 
> >
> >>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
> >
> >It'd be nice to have some help text here.  I know, not everybody else does.
> >
> >>+++ b/drivers/pci/host/pci-keystone-dw.c
> >>...
> >>+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));
> >
> >Blank line here (before the block comment).
> >
> >>+	/*
> >>+	 * 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 __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);
> >
> >This *looks* like it needs a lock to protect against concurrent
> >ks_pcie_cfg_setup() users, since it writes a register.
> >
> >>+
> >>+	return ret;
> >
> >Please use the same style as in ks_dw_pcie_wr_other_conf(), i.e., get rid
> >of "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);
> >>+}
> >
> >>+++ b/drivers/pci/host/pci-keystone.c
> >>...
> >
> >>+static struct platform_driver ks_pcie_driver __refdata = {
> >
> >Why does this need to be __refdata?  There are no other occurrences in
> >drivers/pci.
> >
> >>+	.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),
> >>+	},
> >>+};
> >
> >Bjorn
> 
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Jason Gunthorpe July 23, 2014, 5:42 p.m. UTC | #4
On Tue, Jul 22, 2014 at 05:52:00PM -0600, Bjorn Helgaas wrote:
> If there is a hardware defect, a PCI quirk is a reasonable way to work
> around it, since that's the main purpose of quirks.  fixup_mpss_256()
> is an example of something that sounds superficially similar.

It was my suggestion to engage the PCI-E tuning code. By my
understanding the HW bug is that read response segmentation at the
host bridge does not work - so all read requests from any downstream
device must have responses that fit within a single packet.

This is completely against how the spec envisions things working,
segmentation is a mandatory function. As you point out there is no
parameter bounding the maximum read request size that a completer will
accept.

So, the only fix is that every downstream device must always have a
MRSS set to less than the MPS of the host bridge.

Which means the tuning code must be involved somehow, as that code
controls the MRSS of unrelated devices...

Regards,
Jason
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Murali Karicheri July 30, 2014, 7:34 p.m. UTC | #5
On 07/23/2014 01:42 PM, Jason Gunthorpe wrote:
> On Tue, Jul 22, 2014 at 05:52:00PM -0600, Bjorn Helgaas wrote:
>> If there is a hardware defect, a PCI quirk is a reasonable way to work
>> around it, since that's the main purpose of quirks.  fixup_mpss_256()
>> is an example of something that sounds superficially similar.
>
> It was my suggestion to engage the PCI-E tuning code. By my
> understanding the HW bug is that read response segmentation at the
> host bridge does not work - so all read requests from any downstream
> device must have responses that fit within a single packet.
>

In the case of Keystone PCI, when I set the MRSS to 256 in the EP, PCI 
controller is able to function properly. Keystone spec says.

• Maximum outbound payload size of 128 bytes
• Maximum inbound payload size of 256 bytes
• Maximum remote read request size of 256 bytes

I am interpreting the "Maximum remote read request size" to indicate it 
can's handle if it exceeds the limit. It has an outbound payload size of 
128 bytes. So in this case a read request would results in 2 completion 
packets. So it seems to be able to segment up to maximum 256 bytes of 
read request. Where do I find the requirement in PCI spec that "read 
response segmentation at the host bridge does not work" ?

> This is completely against how the spec envisions things working,
> segmentation is a mandatory function. As you point out there is no
> parameter bounding the maximum read request size that a completer will
> accept.
>
> So, the only fix is that every downstream device must always have a
> MRSS set to less than the MPS of the host bridge.

Why this can't be the default behavior in the PCI core? Any cons?

Murali
>
> Which means the tuning code must be involved somehow, as that code
> controls the MRSS of unrelated devices...
>
> Regards,
> Jason

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Jason Gunthorpe July 30, 2014, 8:05 p.m. UTC | #6
On Wed, Jul 30, 2014 at 03:34:44PM -0400, Murali Karicheri wrote:

> • Maximum remote read request size of 256 bytes

The PCI spec simply does not permit a completer to impose this
limitation.

See spec 2.3.1.1

It is not an option to error a read request because it is too
long. All requests must be completed. All completions must be segmented
according to the RCB and Max_Payload_Size.

> completion packets. So it seems to be able to segment up to maximum
> 256 bytes of read request. Where do I find the requirement in PCI
> spec that "read response segmentation at the host bridge does not
> work" ?

You just said it. Segmenting up to only 256 bytes is not a limitation
the completer can impose. Such a device is non-conformant.

> >So, the only fix is that every downstream device must always have a
> >MRSS set to less than the MPS of the host bridge.
> 
> Why this can't be the default behavior in the PCI core? Any cons?

It increases read request traffic and read response latency on the bus
for large transfers.

The MRSS is intented as a performance tuning knob, it is not something
that ever needs to be set properly for correct bus operation.

Jason
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Murali Karicheri Aug. 6, 2014, 2:38 p.m. UTC | #7
On 07/30/2014 04:05 PM, Jason Gunthorpe wrote:
> On Wed, Jul 30, 2014 at 03:34:44PM -0400, Murali Karicheri wrote:
>
>> • Maximum remote read request size of 256 bytes
>
> The PCI spec simply does not permit a completer to impose this
> limitation.
>
> See spec 2.3.1.1
>
> It is not an option to error a read request because it is too
> long. All requests must be completed. All completions must be segmented
> according to the RCB and Max_Payload_Size.
>
>> completion packets. So it seems to be able to segment up to maximum
>> 256 bytes of read request. Where do I find the requirement in PCI
>> spec that "read response segmentation at the host bridge does not
>> work" ?
>
> You just said it. Segmenting up to only 256 bytes is not a limitation
> the completer can impose. Such a device is non-conformant.
>
>>> So, the only fix is that every downstream device must always have a
>>> MRSS set to less than the MPS of the host bridge.
>>
>> Why this can't be the default behavior in the PCI core? Any cons?
>
> It increases read request traffic and read response latency on the bus
> for large transfers.
>
> The MRSS is intented as a performance tuning knob, it is not something
> that ever needs to be set properly for correct bus operation.
>
> Jason
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Jason, Bjorn,

It appears that Keystone PCI has a hardware limitation that can't
handle read request size of greater than 256 bytes and a quirk is the
way to handle this hardware limitation. I will be sending a patch to
address this

Murali

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diff mbox

Patch

diff --git a/Documentation/devicetree/bindings/pci/pci-keystone.txt b/Documentation/devicetree/bindings/pci/pci-keystone.txt
new file mode 100644
index 0000000..1bd0476
--- /dev/null
+++ b/Documentation/devicetree/bindings/pci/pci-keystone.txt
@@ -0,0 +1,68 @@ 
+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.
+
+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..701acb4
--- /dev/null
+++ b/drivers/pci/host/pci-keystone-dw.c
@@ -0,0 +1,521 @@ 
+/*
+ * 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;
+
+	/* first disable Link training */
+	val = readl(ks_pcie->va_app_base + CMD_STATUS);
+	val &= ~LTSSM_EN_VAL;
+	writel(LTSSM_EN_VAL | val,  ks_pcie->va_app_base + CMD_STATUS);
+
+	/* 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..c1cfaef
--- /dev/null
+++ b/drivers/pci/host/pci-keystone.c
@@ -0,0 +1,386 @@ 
+/*
+ * 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 (dw_pcie_link_up(pp)) {
+		dev_err(pp->dev, "Link already up\n");
+		return 0;
+	}
+
+	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) {
+			ks_dw_pcie_initiate_link_train(ks_pcie);
+			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 *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;
+
+	/* 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);
+
+	/* 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 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;
+
+	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..729ea7d
--- /dev/null
+++ b/drivers/pci/host/pci-keystone.h
@@ -0,0 +1,58 @@ 
+/*
+ * 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;
+	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);