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| author | Thomas Petazzoni <thomas.petazzoni@bootlin.com> | 2018-10-18 18:37:16 +0300 |
|---|---|---|
| committer | Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> | 2018-10-18 19:50:19 +0300 |
| commit | 23a5fba4d9411787c8e86ff5808e7d8e41bf3935 (patch) | |
| tree | 2569b40cb46199c00331338936d203dffbfbfbae /drivers/pci/Makefile | |
| parent | 684e07ed39ddd12731eda9933a946c7424e91c14 (diff) | |
| download | linux-23a5fba4d9411787c8e86ff5808e7d8e41bf3935.tar.xz | |
PCI: Introduce PCI bridge emulated config space common logic
Some PCI host controllers do not expose a configuration space for the
root port PCI bridge. Due to this, the Marvell Armada 370/38x/XP PCI
controller driver (pci-mvebu) emulates a root port PCI bridge
configuration space, and uses that to (among other things) dynamically
create the memory windows that correspond to the PCI MEM and I/O
regions.
Since we now need to add a very similar logic for the Marvell Armada
37xx PCI controller driver (pci-aardvark), instead of duplicating the
code, we create in this commit a common logic called pci-bridge-emul.
The idea of this logic is to emulate a root port PCI bridge
configuration space by providing configuration space read/write
operations, and faking behind the scenes the configuration space of a
PCI bridge. A PCI host controller driver simply has to call
pci_bridge_emul_conf_read() and pci_bridge_emul_conf_write() to
read/write the configuration space of the bridge.
By default, the PCI bridge configuration space is simply emulated by a
chunk of memory, but the PCI host controller can override the behavior
of the read and write operations on a per-register basis to do
additional actions if needed. We take care of complying with the
behavior of the PCI configuration space registers in terms of bits
that are read-write, read-only, reserved and write-1-to-clear.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Russell King <rmk+kernel@armlinux.org.uk>
Diffstat (limited to 'drivers/pci/Makefile')
| -rw-r--r-- | drivers/pci/Makefile | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/pci/Makefile b/drivers/pci/Makefile index 1b2cfe51e8d7..3e5caf7347e9 100644 --- a/drivers/pci/Makefile +++ b/drivers/pci/Makefile @@ -19,6 +19,7 @@ obj-$(CONFIG_HOTPLUG_PCI) += hotplug/ obj-$(CONFIG_PCI_MSI) += msi.o obj-$(CONFIG_PCI_ATS) += ats.o obj-$(CONFIG_PCI_IOV) += iov.o +obj-$(CONFIG_PCI_BRIDGE_EMUL) += pci-bridge-emul.o obj-$(CONFIG_ACPI) += pci-acpi.o obj-$(CONFIG_PCI_LABEL) += pci-label.o obj-$(CONFIG_X86_INTEL_MID) += pci-mid.o |