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pci: Add standard PCIe ECAM macros

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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>
This commit is contained in:
Pali Rohár 2021-11-03 01:01:05 +01:00 • committed by Tom Rini
parent b814e0007e
commit a4bc38da27
7 changed files with 37 additions and 41 deletions
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26
include/pci.h
View file

@ -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>