846da3d7df
Marvell MVEBU PCIe driver requires of_pcie_get_devfn(), import it from Linux. Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> Acked-by: Lucas Stach <l.stach@pengutronix.de> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
28 lines
688 B
C
28 lines
688 B
C
#include <common.h>
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#include <errno.h>
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#include <of.h>
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#include <of_pci.h>
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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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reg = of_get_property(np, "reg", &size);
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if (!reg || size < 5 * sizeof(__be32))
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return -EINVAL;
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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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