From mboxrd@z Thu Jan 1 00:00:00 1970 From: Liviu.Dudau@arm.com (Liviu Dudau) Date: Tue, 1 Jul 2014 19:43:29 +0100 Subject: [PATCH v8 4/9] pci: OF: Fix the conversion of IO ranges into IO resources. In-Reply-To: <1404240214-9804-1-git-send-email-Liviu.Dudau@arm.com> References: <1404240214-9804-1-git-send-email-Liviu.Dudau@arm.com> Message-ID: <1404240214-9804-5-git-send-email-Liviu.Dudau@arm.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 and make it return an error message. Signed-off-by: Liviu Dudau Tested-by: Tanmay Inamdar --- drivers/of/address.c | 47 ++++++++++++++++++++++++++++++++++++++++++++++ include/linux/of_address.h | 13 ++----------- 2 files changed, 49 insertions(+), 11 deletions(-) diff --git a/drivers/of/address.c b/drivers/of/address.c index 1345733..cbbaed2 100644 --- a/drivers/of/address.c +++ b/drivers/of/address.c @@ -872,3 +872,50 @@ bool of_dma_is_coherent(struct device_node *np) return false; } EXPORT_SYMBOL_GPL(of_dma_is_coherent); + +/* + * 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. + * + * Returns EINVAL if the range cannot be converted to resource. + * + * 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. + */ +int of_pci_range_to_resource(struct of_pci_range *range, + struct device_node *np, struct resource *res) +{ + int err; + res->flags = range->flags; + res->parent = res->child = res->sibling = NULL; + res->name = np->full_name; + + if (res->flags & IORESOURCE_IO) { + unsigned long port = -1; + err = pci_register_io_range(range->cpu_addr, range->size); + if (err) + goto invalid_range; + port = pci_address_to_pio(range->cpu_addr); + if (port == (unsigned long)-1) { + err = -EINVAL; + goto invalid_range; + } + res->start = port; + } else { + res->start = range->cpu_addr; + } + res->end = res->start + range->size - 1; + return 0; + +invalid_range: + res->start = (resource_size_t)OF_BAD_ADDR; + res->end = (resource_size_t)OF_BAD_ADDR; + return err; +} + diff --git a/include/linux/of_address.h b/include/linux/of_address.h index ac4aac4..33c0420 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 int 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); -- 2.0.0