78 lines
2.4 KiB
Diff
78 lines
2.4 KiB
Diff
From 45ab9702fb47d18dca116b3a0509efa19fbcb27a Mon Sep 17 00:00:00 2001
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From: Thierry Reding <thierry.reding@avionic-design.de>
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Date: Thu, 16 May 2013 17:55:18 +0200
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Subject: [PATCH] of/pci: Add of_pci_get_devfn() function
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commit 45ab9702fb47d18dca116b3a0509efa19fbcb27a upstream.
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This function can be used to parse the device and function number from a
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standard 5-cell PCI resource. PCI_SLOT() and PCI_FUNC() can be used on
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the returned value obtain the device and function numbers respectively.
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Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
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Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
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Signed-off-by: Jason Cooper <jason@lakedaemon.net>
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---
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drivers/of/of_pci.c | 34 +++++++++++++++++++++++++++++-----
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include/linux/of_pci.h | 1 +
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2 files changed, 30 insertions(+), 5 deletions(-)
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--- a/drivers/of/of_pci.c
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+++ b/drivers/of/of_pci.c
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@@ -5,14 +5,15 @@
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#include <asm/prom.h>
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static inline int __of_pci_pci_compare(struct device_node *node,
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- unsigned int devfn)
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+ unsigned int data)
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{
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- unsigned int size;
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- const __be32 *reg = of_get_property(node, "reg", &size);
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+ int devfn;
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- if (!reg || size < 5 * sizeof(__be32))
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+ devfn = of_pci_get_devfn(node);
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+ if (devfn < 0)
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return 0;
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- return ((be32_to_cpup(®[0]) >> 8) & 0xff) == devfn;
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+
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+ return devfn == data;
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}
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struct device_node *of_pci_find_child_device(struct device_node *parent,
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@@ -40,3 +41,26 @@ struct device_node *of_pci_find_child_de
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return NULL;
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}
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EXPORT_SYMBOL_GPL(of_pci_find_child_device);
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+
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+/**
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+ * of_pci_get_devfn() - Get device and function numbers for a device node
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+ * @np: device node
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+ *
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+ * Parses a standard 5-cell PCI resource and returns an 8-bit value that can
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+ * be passed to the PCI_SLOT() and PCI_FUNC() macros to extract the device
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+ * and function numbers respectively. On error a negative error code is
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+ * returned.
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+ */
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+int of_pci_get_devfn(struct device_node *np)
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+{
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+ unsigned int size;
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+ const __be32 *reg;
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+
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+ reg = of_get_property(np, "reg", &size);
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+
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+ if (!reg || size < 5 * sizeof(__be32))
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+ return -EINVAL;
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+
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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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--- a/include/linux/of_pci.h
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+++ b/include/linux/of_pci.h
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@@ -10,5 +10,6 @@ int of_irq_map_pci(const struct pci_dev
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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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#endif
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