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authorLiviu Dudau <Liviu.Dudau@arm.com>2014-09-29 18:29:25 +0400
committerBjorn Helgaas <bhelgaas@google.com>2014-10-01 03:08:40 +0400
commit0b0b0893d49b34201a6c4416b1a707b580b91e3d (patch)
tree6705257f35735ce6bc8c85a760d49227905d6b13 /drivers/of/address.c
parent83bbde1cc0ec9d156b9271e29ffe0dc89c687feb (diff)
downloadlinux-0b0b0893d49b34201a6c4416b1a707b580b91e3d.tar.xz
of/pci: Fix the conversion of IO ranges into IO resources
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, returning a CPU physical address instead of a port number. Also fix all the drivers that depend on the old behaviour by fetching the CPU physical address based on the port number where it is being needed. Signed-off-by: Liviu Dudau <Liviu.Dudau@arm.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Linus Walleij <linus.walleij@linaro.org> CC: Grant Likely <grant.likely@linaro.org> CC: Rob Herring <robh+dt@kernel.org> CC: Arnd Bergmann <arnd@arndb.de> CC: Thierry Reding <thierry.reding@gmail.com> CC: Simon Horman <horms@verge.net.au> CC: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'drivers/of/address.c')
-rw-r--r--drivers/of/address.c44
1 files changed, 40 insertions, 4 deletions
diff --git a/drivers/of/address.c b/drivers/of/address.c
index 327a57410797..afdb78299f61 100644
--- a/drivers/of/address.c
+++ b/drivers/of/address.c
@@ -295,14 +295,50 @@ struct of_pci_range *of_pci_range_parser_one(struct of_pci_range_parser *parser,
}
EXPORT_SYMBOL_GPL(of_pci_range_parser_one);
-void of_pci_range_to_resource(struct of_pci_range *range,
- struct device_node *np, struct resource *res)
+/*
+ * 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->start = range->cpu_addr;
- res->end = range->cpu_addr + range->size - 1;
res->parent = res->child = res->sibling = NULL;
res->name = np->full_name;
+
+ if (res->flags & IORESOURCE_IO) {
+ unsigned long port;
+ 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;
}
#endif /* CONFIG_PCI */