X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=include%2Fpci.h;h=508f7bca81c00f8625e91c9c4fe02cb1c7754cd3;hb=ffbad25b3221fd1b0cd0aff1128d57fcb279e020;hp=936cfe975cbe706ce679d0decb5e7d6f843cab7d;hpb=da206916a14fc8ab8962763c47673128a29b4b9c;p=oweals%2Fu-boot.git

diff --git a/include/pci.h b/include/pci.h
index 936cfe975c..508f7bca81 100644
--- a/include/pci.h
+++ b/include/pci.h
@@ -405,6 +405,7 @@
 #define  PCI_MSI_FLAGS_QSIZE	0x70	/* Message queue size configured */
 #define  PCI_MSI_FLAGS_QMASK	0x0e	/* Maximum queue size available */
 #define  PCI_MSI_FLAGS_ENABLE	0x01	/* MSI feature enabled */
+#define  PCI_MSI_FLAGS_MASKBIT	0x0100	/* Per-vector masking capable */
 #define PCI_MSI_RFU		3	/* Rest of capability flags */
 #define PCI_MSI_ADDRESS_LO	4	/* Lower 32 bits */
 #define PCI_MSI_ADDRESS_HI	8	/* Upper 32 bits (if PCI_MSI_FLAGS_64BIT set) */
@@ -499,9 +500,20 @@ static inline void pci_set_region(struct pci_region *reg,
 typedef int pci_dev_t;
 
 #define PCI_BUS(d)		(((d) >> 16) & 0xff)
+
+/*
+ * Please note the difference in DEVFN usage in U-Boot vs Linux. U-Boot
+ * uses DEVFN in bits 15-8 but Linux instead expects DEVFN in bits 7-0.
+ * Please see the Linux header include/uapi/linux/pci.h for more details.
+ * This is relevant for the following macros:
+ * PCI_DEV, PCI_FUNC, PCI_DEVFN
+ * The U-Boot macro PCI_DEV is equivalent to the Linux PCI_SLOT version with
+ * the remark from above (input d in bits 15-8 instead of 7-0.
+ */
 #define PCI_DEV(d)		(((d) >> 11) & 0x1f)
 #define PCI_FUNC(d)		(((d) >> 8) & 0x7)
 #define PCI_DEVFN(d, f)		((d) << 11 | (f) << 8)
+
 #define PCI_MASK_BUS(bdf)	((bdf) & 0xffff)
 #define PCI_ADD_BUS(bus, devfn)	(((bus) << 16) | (devfn))
 #define PCI_BDF(b, d, f)	((b) << 16 | PCI_DEVFN(d, f))