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62 lines
1.9 KiB
62 lines
1.9 KiB
11 years ago
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From 6275a8e0bacac9702350b6a003470a9ce67c9139 Mon Sep 17 00:00:00 2001
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From: Thierry Reding <thierry.reding@avionic-design.de>
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Date: Mon, 11 Feb 2013 09:22:20 +0100
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Subject: [PATCH 03/29] of/pci: Add of_pci_parse_bus_range() function
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This function can be used to parse a bus-range property as specified by
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device nodes representing PCI bridges.
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Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
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---
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drivers/of/of_pci.c | 25 +++++++++++++++++++++++++
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include/linux/of_pci.h | 1 +
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2 files changed, 26 insertions(+)
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diff --git a/drivers/of/of_pci.c b/drivers/of/of_pci.c
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index 4dd7b9b..42c687a 100644
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--- a/drivers/of/of_pci.c
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+++ b/drivers/of/of_pci.c
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@@ -64,3 +64,28 @@ int of_pci_get_devfn(struct device_node *np)
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return (be32_to_cpup(reg) >> 8) & 0xff;
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}
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EXPORT_SYMBOL_GPL(of_pci_get_devfn);
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+
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+/**
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+ * of_pci_parse_bus_range() - parse the bus-range property of a PCI device
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+ * @node: device node
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+ * @res: address to a struct resource to return the bus-range
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+ *
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+ * Returns 0 on success or a negative error-code on failure.
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+ */
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+int of_pci_parse_bus_range(struct device_node *node, struct resource *res)
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+{
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+ const __be32 *values;
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+ int len;
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+
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+ values = of_get_property(node, "bus-range", &len);
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+ if (!values || len < sizeof(*values) * 2)
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+ return -EINVAL;
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+
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+ res->name = node->name;
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+ res->start = be32_to_cpup(values++);
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+ res->end = be32_to_cpup(values);
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+ res->flags = IORESOURCE_BUS;
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+
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+ return 0;
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+}
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+EXPORT_SYMBOL_GPL(of_pci_parse_bus_range);
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diff --git a/include/linux/of_pci.h b/include/linux/of_pci.h
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index 91ec484..7a04826 100644
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--- a/include/linux/of_pci.h
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+++ b/include/linux/of_pci.h
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@@ -11,5 +11,6 @@ struct device_node;
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struct device_node *of_pci_find_child_device(struct device_node *parent,
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unsigned int devfn);
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int of_pci_get_devfn(struct device_node *np);
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+int of_pci_parse_bus_range(struct device_node *node, struct resource *res);
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#endif
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--
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1.8.4.rc1
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