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authorLiviu Dudau <Liviu.Dudau@arm.com>2014-09-29 15:29:27 +0100
committerBjorn Helgaas <bhelgaas@google.com>2014-09-30 17:08:57 -0600
commit41e5c0f81d3e676d671d96a0a1fafb27abfbd9d7 (patch)
tree674d5c5bc98998014d5b454f059bb052660057d5 /drivers/of
parent670ba0c8883b576d0aec28bd7a838358a4be1406 (diff)
of/pci: Add pci_get_new_domain_nr() and of_get_pci_domain_nr()
Add pci_get_new_domain_nr() to allocate a new domain number and of_get_pci_domain_nr() to retrieve the PCI domain number of a given device from DT. Host bridge drivers or architecture-specific code can choose to implement their PCI domain number policy using these two functions. Using of_get_pci_domain_nr() guarantees a stable PCI domain number on every boot provided that all host bridge controllers are assigned a number in the device tree using "linux,pci-domain" property. Mixing use of pci_get_new_domain_nr() and of_get_pci_domain_nr() is not recommended as it can lead to potentially conflicting domain numbers being assigned to root buses behind different host bridges. Signed-off-by: Liviu Dudau <Liviu.Dudau@arm.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> CC: Arnd Bergmann <arnd@arndb.de> CC: Grant Likely <grant.likely@linaro.org> CC: Rob Herring <robh+dt@kernel.org> CC: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'drivers/of')
-rw-r--r--drivers/of/of_pci.c25
1 files changed, 25 insertions, 0 deletions
diff --git a/drivers/of/of_pci.c b/drivers/of/of_pci.c
index 84819963379..82d172fa145 100644
--- a/drivers/of/of_pci.c
+++ b/drivers/of/of_pci.c
@@ -89,6 +89,31 @@ int of_pci_parse_bus_range(struct device_node *node, struct resource *res)
}
EXPORT_SYMBOL_GPL(of_pci_parse_bus_range);
+/**
+ * This function will try to obtain the host bridge domain number by
+ * finding a property called "linux,pci-domain" of the given device node.
+ *
+ * @node: device tree node with the domain information
+ *
+ * Returns the associated domain number from DT in the range [0-0xffff], or
+ * a negative value if the required property is not found.
+ */
+int of_get_pci_domain_nr(struct device_node *node)
+{
+ const __be32 *value;
+ int len;
+ u16 domain;
+
+ value = of_get_property(node, "linux,pci-domain", &len);
+ if (!value || len < sizeof(*value))
+ return -EINVAL;
+
+ domain = (u16)be32_to_cpup(value);
+
+ return domain;
+}
+EXPORT_SYMBOL_GPL(of_get_pci_domain_nr);
+
#ifdef CONFIG_PCI_MSI
static LIST_HEAD(of_pci_msi_chip_list);