pci: Add standard PCIe ECAM macros
Lot of PCIe controllers are using ECAM addressing. So add common ECAM
macros into U-Boot's pci.h header file which can be suitable for most
PCI controller drivers.
Replace custom ECAM address macros in every PCI controller driver by new
ECAM macros from U-Boot's pci.h header file.
Similar macros are defined also in Linux kernel. There is a small
difference between Linux and these new U-Boot macros.
U-Boot's PCIE_ECAM_OFFSET() takes device and function numbers in separate
arguments. Linux's PCIE_ECAM_OFFSET() takes device and function numbers
encoded in one argument. The reason is that U-Boot's PCI_DEVFN() macro is
different than Linux's PCI_SLOT() macro. So having device and function
numbers in separate arguments makes code more straightforward.
Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Stefan Roese <sr@denx.de>
diff --git a/include/pci.h b/include/pci.h
index 797f224..6c1094d 100644
--- a/include/pci.h
+++ b/include/pci.h
@@ -522,6 +522,32 @@
#include <pci_ids.h>
+/*
+ * 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_DEV_SHIFT 15 /* Device number */
+#define PCIE_ECAM_FUNC_SHIFT 12 /* Function number */
+
+#define PCIE_ECAM_BUS_MASK 0xff
+#define PCIE_ECAM_DEV_MASK 0x1f
+#define PCIE_ECAM_FUNC_MASK 0x7
+#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_DEV(x) (((x) & PCIE_ECAM_DEV_MASK) << PCIE_ECAM_DEV_SHIFT)
+#define PCIE_ECAM_FUNC(x) (((x) & PCIE_ECAM_FUNC_MASK) << PCIE_ECAM_FUNC_SHIFT)
+#define PCIE_ECAM_REG(x) ((x) & PCIE_ECAM_REG_MASK)
+
+#define PCIE_ECAM_OFFSET(bus, dev, func, where) \
+ (PCIE_ECAM_BUS(bus) | \
+ PCIE_ECAM_DEV(dev) | \
+ PCIE_ECAM_FUNC(func) | \
+ PCIE_ECAM_REG(where))
+
#ifndef __ASSEMBLY__
#include <dm/pci.h>