Merge branch 'pci/ecam'

- Unify ECAM constants in native PCI Express drivers (Krzysztof Wilczyński)

- Add thunder-pem constant for custom ".bus_shift" initialiser (Krzysztof
  Wilczyński)

- Convert iproc to use new ECAM constants (Krzysztof Wilczyński)

- Change vmd __iomem pointers from "char *" to "void *" (Krzysztof
  Wilczyński)

- Remove unused xgene .bus_shift initialisers (Krzysztof Wilczyński)

* pci/ecam:
  PCI: xgene: Removed unused ".bus_shift" initialisers from pci-xgene.c
  PCI: vmd: Update type of the __iomem pointers
  PCI: iproc: Convert to use the new ECAM constants
  PCI: thunder-pem: Add constant for custom ".bus_shift" initialiser
  PCI: Unify ECAM constants in native PCI Express drivers

1 files changed, 27 insertions, 0 deletions

diff --git a/include/linux/pci-ecam.h b/include/linux/pci-ecam.h
index 033ce74f02e8..65d3d83015c3 100644
--- a/include/linux/pci-ecam.h
+++ b/include/linux/pci-ecam.h
@@ -10,6 +10,33 @@
 #include <linux/platform_device.h>
 
 /*
+ * Memory address shift values for the byte-level address that
+ * can be used when accessing the PCI Express Configuration Space.
+ */
+
+/*
+ * Enhanced Configuration Access Mechanism (ECAM)
+ *
+ * See PCI Express Base Specification, Revision 5.0, Version 1.0,
+ * Section 7.2.2, Table 7-1, p. 677.
+ */
+#define PCIE_ECAM_BUS_SHIFT	20 /* Bus number */
+#define PCIE_ECAM_DEVFN_SHIFT	12 /* Device and Function number */
+
+#define PCIE_ECAM_BUS_MASK	0xff
+#define PCIE_ECAM_DEVFN_MASK	0xff
+#define PCIE_ECAM_REG_MASK	0xfff /* Limit offset to a maximum of 4K */
+
+#define PCIE_ECAM_BUS(x)	(((x) & PCIE_ECAM_BUS_MASK) << PCIE_ECAM_BUS_SHIFT)
+#define PCIE_ECAM_DEVFN(x)	(((x) & PCIE_ECAM_DEVFN_MASK) << PCIE_ECAM_DEVFN_SHIFT)
+#define PCIE_ECAM_REG(x)	((x) & PCIE_ECAM_REG_MASK)
+
+#define PCIE_ECAM_OFFSET(bus, devfn, where) \
+	(PCIE_ECAM_BUS(bus) | \
+	 PCIE_ECAM_DEVFN(devfn) | \
+	 PCIE_ECAM_REG(where))
+
+/*
  * struct to hold pci ops and bus shift of the config window
  * for a PCI controller.
  */