pci: Add helper to find a VPD resource data type

[net-next-2.6.git] / include / linux / pci.h

diff --git a/include/linux/pci.h b/include/linux/pci.h
index e2575f86133afb5d9a4c9328c5998ff04ba0b1ec..e30ceea7345b02736d7ae2f9105bb4d62ebeed2f 100644 (file)
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1349,5 +1349,63 @@ static inline bool pci_is_pcie(struct pci_dev *dev)
 
 void pci_request_acs(void);
 
+
+#define PCI_VPD_LRDT                   0x80    /* Large Resource Data Type */
+#define PCI_VPD_LRDT_ID(x)             (x | PCI_VPD_LRDT)
+
+/* Large Resource Data Type Tag Item Names */
+#define PCI_VPD_LTIN_ID_STRING         0x02    /* Identifier String */
+#define PCI_VPD_LTIN_RO_DATA           0x10    /* Read-Only Data */
+#define PCI_VPD_LTIN_RW_DATA           0x11    /* Read-Write Data */
+
+#define PCI_VPD_LRDT_ID_STRING         PCI_VPD_LRDT_ID(PCI_VPD_LTIN_ID_STRING)
+#define PCI_VPD_LRDT_RO_DATA           PCI_VPD_LRDT_ID(PCI_VPD_LTIN_RO_DATA)
+#define PCI_VPD_LRDT_RW_DATA           PCI_VPD_LRDT_ID(PCI_VPD_LTIN_RW_DATA)
+
+/* Small Resource Data Type Tag Item Names */
+#define PCI_VPD_STIN_END               0x78    /* End */
+
+#define PCI_VPD_SRDT_END               PCI_VPD_STIN_END
+
+#define PCI_VPD_SRDT_TIN_MASK          0x78
+#define PCI_VPD_SRDT_LEN_MASK          0x07
+
+#define PCI_VPD_LRDT_TAG_SIZE          3
+#define PCI_VPD_SRDT_TAG_SIZE          1
+
+/**
+ * pci_vpd_lrdt_size - Extracts the Large Resource Data Type length
+ * @lrdt: Pointer to the beginning of the Large Resource Data Type tag
+ *
+ * Returns the extracted Large Resource Data Type length.
+ */
+static inline u16 pci_vpd_lrdt_size(const u8 *lrdt)
+{
+       return (u16)lrdt[1] + ((u16)lrdt[2] << 8);
+}
+
+/**
+ * pci_vpd_srdt_size - Extracts the Small Resource Data Type length
+ * @lrdt: Pointer to the beginning of the Small Resource Data Type tag
+ *
+ * Returns the extracted Small Resource Data Type length.
+ */
+static inline u8 pci_vpd_srdt_size(const u8 *srdt)
+{
+       return (*srdt) & PCI_VPD_SRDT_LEN_MASK;
+}
+
+/**
+ * pci_vpd_find_tag - Locates the Resource Data Type tag provided
+ * @buf: Pointer to buffered vpd data
+ * @off: The offset into the buffer at which to begin the search
+ * @len: The length of the vpd buffer
+ * @rdt: The Resource Data Type to search for
+ *
+ * Returns the index where the Resource Data Type was found or
+ * -ENOENT otherwise.
+ */
+int pci_vpd_find_tag(const u8 *buf, unsigned int off, unsigned int len, u8 rdt);
+
 #endif /* __KERNEL__ */
 #endif /* LINUX_PCI_H */