| Message ID | 1437993919-99241-1-git-send-email-gabriele.paoloni@huawei.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
> -----Original Message----- > From: Gabriele Paoloni > Sent: Monday, July 27, 2015 11:45 AM > 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 v5] 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 Dudai <Liviu.Dudau@arm.com> Fixed Liviu's surname in v6, sorry I messed up amending the commit > Acked-by: Rob Herring <robh@kernel.org> > --- > 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 --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; };