| Message ID | 1394020137-1830-3-git-send-email-Liviu.Dudau@arm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Wed, 5 Mar 2014 11:48:53 +0000, Liviu Dudau <Liviu.Dudau@arm.com> wrote: > The ranges property for a host bridge controller in DT describes > the mapping between the PCI bus address and the CPU physical address. > The resources framework however expects that the IO resources start > at a pseudo "port" address 0 (zero) and have a maximum size of IO_SPACE_LIMIT. > The conversion from pci ranges to resources failed to take that into account. > > In the process move the function into drivers/of/address.c as it > now depends on pci_address_to_pio() code. > > Signed-off-by: Liviu Dudau <Liviu.Dudau@arm.com> > Tested-by: Tanmay Inamdar <tinamdar@apm.com> I think this is okay, but I'll need an ack from Arnd or Ben. g. > --- > drivers/of/address.c | 34 ++++++++++++++++++++++++++++++++++ > include/linux/of_address.h | 13 ++----------- > 2 files changed, 36 insertions(+), 11 deletions(-) > > diff --git a/drivers/of/address.c b/drivers/of/address.c > index d1bb30f..d595d98 100644 > --- a/drivers/of/address.c > +++ b/drivers/of/address.c > @@ -724,3 +724,37 @@ void __iomem *of_iomap(struct device_node *np, int index) > return ioremap(res.start, resource_size(&res)); > } > EXPORT_SYMBOL(of_iomap); > + > +/** > + * of_pci_range_to_resource - Create a resource from an of_pci_range > + * @range: the PCI range that describes the resource > + * @np: device node where the range belongs to > + * @res: pointer to a valid resource that will be updated to > + * reflect the values contained in the range. > + * Note that if the range is an IO range, the resource will be converted > + * using pci_address_to_pio() which can fail if it is called too early or > + * if the range cannot be matched to any host bridge IO space (our case here). > + * To guard against that we try to register the IO range first. > + * If that fails we know that pci_address_to_pio() will do too. > + */ > +void of_pci_range_to_resource(struct of_pci_range *range, > + struct device_node *np, struct resource *res) > +{ > + res->flags = range->flags; > + if (res->flags & IORESOURCE_IO) { > + unsigned long port = -1; > + if (!pci_register_io_range(range->cpu_addr, range->size)) > + port = pci_address_to_pio(range->cpu_addr); > + if (port == (unsigned long)-1) { > + res->start = (resource_size_t)OF_BAD_ADDR; > + res->end = (resource_size_t)OF_BAD_ADDR; > + return; > + } > + res->start = port; > + } else { > + res->start = range->cpu_addr; > + } > + res->end = res->start + range->size - 1; > + res->parent = res->child = res->sibling = NULL; > + res->name = np->full_name; > +} > diff --git a/include/linux/of_address.h b/include/linux/of_address.h > index 40c418d..3fe500a 100644 > --- a/include/linux/of_address.h > +++ b/include/linux/of_address.h > @@ -23,17 +23,8 @@ struct of_pci_range { > #define for_each_of_pci_range(parser, range) \ > for (; of_pci_range_parser_one(parser, range);) > > -static inline void of_pci_range_to_resource(struct of_pci_range *range, > - struct device_node *np, > - struct resource *res) > -{ > - res->flags = range->flags; > - res->start = range->cpu_addr; > - res->end = range->cpu_addr + range->size - 1; > - res->parent = res->child = res->sibling = NULL; > - res->name = np->full_name; > -} > - > +extern void of_pci_range_to_resource(struct of_pci_range *range, > + struct device_node *np, struct resource *res); > /* Translate a DMA address from device space to CPU space */ > extern u64 of_translate_dma_address(struct device_node *dev, > const __be32 *in_addr); > -- > 1.9.0 > > > _______________________________________________ > linaro-kernel mailing list > linaro-kernel@lists.linaro.org > http://lists.linaro.org/mailman/listinfo/linaro-kernel
On Wednesday 05 March 2014, Liviu Dudau wrote: > + unsigned long port = -1; > + if (!pci_register_io_range(range->cpu_addr, range->size)) > + port = pci_address_to_pio(range->cpu_addr); I don't remember the outcome of my suggestion to just return 'port' from pci_register_io_range(). In my mind that would be much simpler than adding the range in a data structure just so we can look it up in the very next line. Arnd
diff --git a/drivers/of/address.c b/drivers/of/address.c index d1bb30f..d595d98 100644 --- a/drivers/of/address.c +++ b/drivers/of/address.c @@ -724,3 +724,37 @@ void __iomem *of_iomap(struct device_node *np, int index) return ioremap(res.start, resource_size(&res)); } EXPORT_SYMBOL(of_iomap); + +/** + * of_pci_range_to_resource - Create a resource from an of_pci_range + * @range: the PCI range that describes the resource + * @np: device node where the range belongs to + * @res: pointer to a valid resource that will be updated to + * reflect the values contained in the range. + * Note that if the range is an IO range, the resource will be converted + * using pci_address_to_pio() which can fail if it is called too early or + * if the range cannot be matched to any host bridge IO space (our case here). + * To guard against that we try to register the IO range first. + * If that fails we know that pci_address_to_pio() will do too. + */ +void of_pci_range_to_resource(struct of_pci_range *range, + struct device_node *np, struct resource *res) +{ + res->flags = range->flags; + if (res->flags & IORESOURCE_IO) { + unsigned long port = -1; + if (!pci_register_io_range(range->cpu_addr, range->size)) + port = pci_address_to_pio(range->cpu_addr); + if (port == (unsigned long)-1) { + res->start = (resource_size_t)OF_BAD_ADDR; + res->end = (resource_size_t)OF_BAD_ADDR; + return; + } + res->start = port; + } else { + res->start = range->cpu_addr; + } + res->end = res->start + range->size - 1; + res->parent = res->child = res->sibling = NULL; + res->name = np->full_name; +} diff --git a/include/linux/of_address.h b/include/linux/of_address.h index 40c418d..3fe500a 100644 --- a/include/linux/of_address.h +++ b/include/linux/of_address.h @@ -23,17 +23,8 @@ struct of_pci_range { #define for_each_of_pci_range(parser, range) \ for (; of_pci_range_parser_one(parser, range);) -static inline void of_pci_range_to_resource(struct of_pci_range *range, - struct device_node *np, - struct resource *res) -{ - res->flags = range->flags; - res->start = range->cpu_addr; - res->end = range->cpu_addr + range->size - 1; - res->parent = res->child = res->sibling = NULL; - res->name = np->full_name; -} - +extern void of_pci_range_to_resource(struct of_pci_range *range, + struct device_node *np, struct resource *res); /* Translate a DMA address from device space to CPU space */ extern u64 of_translate_dma_address(struct device_node *dev, const __be32 *in_addr);