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[v4] PCI: Store PCIe bus address in struct of_pci_range

Message ID 1437574937-135566-1-git-send-email-gabriele.paoloni@huawei.com (mailing list archive)
State New, archived
Delegated to: Bjorn Helgaas
Headers show

Commit Message

Gabriele Paoloni July 22, 2015, 2:22 p.m. UTC
From: gabriele paoloni <gabriele.paoloni@huawei.com>

    This patch is needed port PCIe designware to new DT parsing API
    As discussed in
    http://lists.infradead.org/pipermail/linux-arm-kernel/2015-January/317743.html
    in designware we have a problem as the PCI addresses in the PCIe controller
    address space are required in order to perform correct HW operation.

    In order to solve this problem commit
    f4c55c5a3 "PCI: designware: Program ATU with untranslated address"
    added code to read the PCIe controller start address directly from the
    DT ranges.

    In the new DT parsing API of_pci_get_host_bridge_resources() hides the
    DT parser from the host controller drivers, so it is not possible
    for drivers to parse values directly from the DT.

    In http://www.spinics.net/lists/linux-pci/msg42540.html we already tried
    to use the new DT parsing API but there is a bug (obviously) in setting
    the <*>_mod_base addresses
    Applying this patch we can easily set "<*>_mod_base = win->__res.start"

    This patch adds a new field in "struct of_pci_range" to store the
    pci bus start address; it fills the field in of_pci_range_parser_one();
    in of_pci_get_host_bridge_resources() it retrieves the resource entry
    after it is created and added to the resource list and uses
    entry->__res.start to store the pci controller address

    the patch is based on 4.2-rc1

    Signed-off-by: Gabriele Paoloni <gabriele.paoloni@huawei.com>
    Acked-by: Liviu Dudau <Liviu.Dudau@arm.com>
---
 drivers/of/address.c       | 2 ++
 drivers/of/of_pci.c        | 4 ++++
 include/linux/of_address.h | 1 +
 3 files changed, 7 insertions(+)

Comments

Gabriele Paoloni July 27, 2015, 10:41 a.m. UTC | #1
Sent "[PATCH v5] PCI: Store PCIe bus address in struct of_pci_range" with Rob Herring ack

> -----Original Message-----

> From: Gabriele Paoloni

> Sent: Wednesday, July 22, 2015 3:22 PM

> To: Gabriele Paoloni; arnd@arndb.de; lorenzo.pieralisi@arm.com;

> Wangzhou (B); bhelgaas@google.com; robh+dt@kernel.org;

> james.morse@arm.com; Liviu.Dudau@arm.com

> Cc: linux-pci@vger.kernel.org; linux-arm-kernel@lists.infradead.org;

> devicetree@vger.kernel.org; Yuanzhichang; Zhudacai; zhangjukuo;

> qiuzhenfa; Liguozhu (Kenneth)

> Subject: [PATCH v4] PCI: Store PCIe bus address in struct of_pci_range

> 

> From: gabriele paoloni <gabriele.paoloni@huawei.com>

> 

>     This patch is needed port PCIe designware to new DT parsing API

>     As discussed in

>     http://lists.infradead.org/pipermail/linux-arm-kernel/2015-

> January/317743.html

>     in designware we have a problem as the PCI addresses in the PCIe

> controller

>     address space are required in order to perform correct HW operation.

> 

>     In order to solve this problem commit

>     f4c55c5a3 "PCI: designware: Program ATU with untranslated address"

>     added code to read the PCIe controller start address directly from

> the

>     DT ranges.

> 

>     In the new DT parsing API of_pci_get_host_bridge_resources() hides

> the

>     DT parser from the host controller drivers, so it is not possible

>     for drivers to parse values directly from the DT.

> 

>     In http://www.spinics.net/lists/linux-pci/msg42540.html we already

> tried

>     to use the new DT parsing API but there is a bug (obviously) in

> setting

>     the <*>_mod_base addresses

>     Applying this patch we can easily set "<*>_mod_base = win-

> >__res.start"

> 

>     This patch adds a new field in "struct of_pci_range" to store the

>     pci bus start address; it fills the field in

> of_pci_range_parser_one();

>     in of_pci_get_host_bridge_resources() it retrieves the resource

> entry

>     after it is created and added to the resource list and uses

>     entry->__res.start to store the pci controller address

> 

>     the patch is based on 4.2-rc1

> 

>     Signed-off-by: Gabriele Paoloni <gabriele.paoloni@huawei.com>

>     Acked-by: Liviu Dudau <Liviu.Dudau@arm.com>

> ---

>  drivers/of/address.c       | 2 ++

>  drivers/of/of_pci.c        | 4 ++++

>  include/linux/of_address.h | 1 +

>  3 files changed, 7 insertions(+)

> 

> diff --git a/drivers/of/address.c b/drivers/of/address.c

> index 8bfda6a..23a5793 100644

> --- a/drivers/of/address.c

> +++ b/drivers/of/address.c

> @@ -253,6 +253,7 @@ struct of_pci_range *of_pci_range_parser_one(struct

> of_pci_range_parser *parser,

>  						struct of_pci_range *range)

>  {

>  	const int na = 3, ns = 2;

> +	const int p_ns = of_n_size_cells(parser->node);

> 

>  	if (!range)

>  		return NULL;

> @@ -265,6 +266,7 @@ struct of_pci_range *of_pci_range_parser_one(struct

> of_pci_range_parser *parser,

>  	range->pci_addr = of_read_number(parser->range + 1, ns);

>  	range->cpu_addr = of_translate_address(parser->node,

>  				parser->range + na);

> +	range->bus_addr = of_read_number(parser->range + na, p_ns);

>  	range->size = of_read_number(parser->range + parser->pna + na,

> ns);

> 

>  	parser->range += parser->np;

> diff --git a/drivers/of/of_pci.c b/drivers/of/of_pci.c

> index 5751dc5..fe57030 100644

> --- a/drivers/of/of_pci.c

> +++ b/drivers/of/of_pci.c

> @@ -198,6 +198,7 @@ int of_pci_get_host_bridge_resources(struct

> device_node *dev,

> 

>  	pr_debug("Parsing ranges property...\n");

>  	for_each_of_pci_range(&parser, &range) {

> +		struct resource_entry *entry;

>  		/* Read next ranges element */

>  		if ((range.flags & IORESOURCE_TYPE_BITS) == IORESOURCE_IO)

>  			snprintf(range_type, 4, " IO");

> @@ -240,6 +241,9 @@ int of_pci_get_host_bridge_resources(struct

> device_node *dev,

>  		}

> 

>  		pci_add_resource_offset(resources, res,	res->start -

> range.pci_addr);

> +		entry = list_last_entry(resources, struct resource_entry,

> node);

> +		/* we are using __res for storing the PCI controller

> address */

> +		entry->__res.start = range.bus_addr;

>  	}

> 

>  	return 0;

> diff --git a/include/linux/of_address.h b/include/linux/of_address.h

> index d88e81b..865f96e 100644

> --- a/include/linux/of_address.h

> +++ b/include/linux/of_address.h

> @@ -16,6 +16,7 @@ struct of_pci_range {

>  	u32 pci_space;

>  	u64 pci_addr;

>  	u64 cpu_addr;

> +	u64 bus_addr;

>  	u64 size;

>  	u32 flags;

>  };

> --

> 1.9.1
diff mbox

Patch

diff --git a/drivers/of/address.c b/drivers/of/address.c
index 8bfda6a..23a5793 100644
--- a/drivers/of/address.c
+++ b/drivers/of/address.c
@@ -253,6 +253,7 @@  struct of_pci_range *of_pci_range_parser_one(struct of_pci_range_parser *parser,
 						struct of_pci_range *range)
 {
 	const int na = 3, ns = 2;
+	const int p_ns = of_n_size_cells(parser->node);
 
 	if (!range)
 		return NULL;
@@ -265,6 +266,7 @@  struct of_pci_range *of_pci_range_parser_one(struct of_pci_range_parser *parser,
 	range->pci_addr = of_read_number(parser->range + 1, ns);
 	range->cpu_addr = of_translate_address(parser->node,
 				parser->range + na);
+	range->bus_addr = of_read_number(parser->range + na, p_ns);
 	range->size = of_read_number(parser->range + parser->pna + na, ns);
 
 	parser->range += parser->np;
diff --git a/drivers/of/of_pci.c b/drivers/of/of_pci.c
index 5751dc5..fe57030 100644
--- a/drivers/of/of_pci.c
+++ b/drivers/of/of_pci.c
@@ -198,6 +198,7 @@  int of_pci_get_host_bridge_resources(struct device_node *dev,
 
 	pr_debug("Parsing ranges property...\n");
 	for_each_of_pci_range(&parser, &range) {
+		struct resource_entry *entry;
 		/* Read next ranges element */
 		if ((range.flags & IORESOURCE_TYPE_BITS) == IORESOURCE_IO)
 			snprintf(range_type, 4, " IO");
@@ -240,6 +241,9 @@  int of_pci_get_host_bridge_resources(struct device_node *dev,
 		}
 
 		pci_add_resource_offset(resources, res,	res->start - range.pci_addr);
+		entry = list_last_entry(resources, struct resource_entry, node);
+		/* we are using __res for storing the PCI controller address */
+		entry->__res.start = range.bus_addr;
 	}
 
 	return 0;
diff --git a/include/linux/of_address.h b/include/linux/of_address.h
index d88e81b..865f96e 100644
--- a/include/linux/of_address.h
+++ b/include/linux/of_address.h
@@ -16,6 +16,7 @@  struct of_pci_range {
 	u32 pci_space;
 	u64 pci_addr;
 	u64 cpu_addr;
+	u64 bus_addr;
 	u64 size;
 	u32 flags;
 };