Re: [PATCH 2/2] pci, pcie-thunder-pem: Add PCIe host driver for ThunderX processors.
From: David Daney
Date: Tue Dec 22 2015 - 14:18:16 EST
On 12/22/2015 02:03 AM, Will Deacon wrote:
On Mon, Dec 21, 2015 at 05:53:42PM -0800, David Daney wrote:
From: David Daney <david.daney@xxxxxxxxxx>
Some Cavium ThunderX processors require quirky access methods for the
config space of the PCIe bridge. Add a driver to provide these config
space accessor functions. The pci-host-generic driver code is used to
configure the PCI machinery.
Signed-off-by: David Daney <david.daney@xxxxxxxxxx>
---
.../devicetree/bindings/pci/pcie-thunder-pem.txt | 43 ++++
drivers/pci/host/Kconfig | 6 +
drivers/pci/host/Makefile | 1 +
drivers/pci/host/pcie-thunder-pem.c | 283 +++++++++++++++++++++
4 files changed, 333 insertions(+)
create mode 100644 Documentation/devicetree/bindings/pci/pcie-thunder-pem.txt
create mode 100644 drivers/pci/host/pcie-thunder-pem.c
diff --git a/Documentation/devicetree/bindings/pci/pcie-thunder-pem.txt b/Documentation/devicetree/bindings/pci/pcie-thunder-pem.txt
new file mode 100644
index 0000000..66824d5
--- /dev/null
+++ b/Documentation/devicetree/bindings/pci/pcie-thunder-pem.txt
@@ -0,0 +1,43 @@
+* ThunderX PEM PCIe host controller
+
+Firmware-initialized PCIe host controller found on some Cavium
+ThunderX processors.
+
+The properties and their meanings are identical to those described in
+host-heneric-pci.txt except as listed below.
+
+Properties of the host controller node that differ from
+host-heneric-pci.txt:
Consistently odd typo (s/heneric/generic/)!
I'm not sure how I managed to do that. I will fix these and resend.
+
+- compatible : Must be "cavium,pci-host-thunder-pem"
+
+- reg : Two entries: First the configuration space for down
+ stream devices base address and size, as accessed
+ from the parent bus. Second, the register bank of
+ the PEM device PCIe bridge.
+
+Example:
+
+ pem2 {
+ compatible = "cavium,pci-host-thunder-pem";
+ device_type = "pci";
+ msi-parent = <&its>;
+ msi-map = <0 &its 0x10000 0x10000>;
+ bus-range = <0x8f 0xc7>;
+ #size-cells = <2>;
+ #address-cells = <3>;
+
+ reg = <0x8880 0x8f000000 0x0 0x39000000>, /* Configuration space */
+ <0x87e0 0xc2000000 0x0 0x00010000>; /* PEM space */
+ ranges = <0x01000000 0x00 0x00020000 0x88b0 0x00020000 0x00 0x00010000>, /* I/O */
+ <0x03000000 0x00 0x10000000 0x8890 0x10000000 0x0f 0xf0000000>, /* mem64 */
+ <0x43000000 0x10 0x00000000 0x88a0 0x00000000 0x10 0x00000000>, /* mem64-pref */
+ <0x03000000 0x87e0 0xc2f00000 0x87e0 0xc2000000 0x00 0x00100000>; /* mem64 PEM BAR4 */
+
+ #interrupt-cells = <1>;
+ interrupt-map-mask = <0 0 0 7>;
+ interrupt-map = <0 0 0 1 &gic0 0 0 0 24 4>, /* INTA */
+ <0 0 0 2 &gic0 0 0 0 25 4>, /* INTB */
+ <0 0 0 3 &gic0 0 0 0 26 4>, /* INTC */
+ <0 0 0 4 &gic0 0 0 0 27 4>; /* INTD */
+ };
diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig
index f131ba9..16ed9c3 100644
--- a/drivers/pci/host/Kconfig
+++ b/drivers/pci/host/Kconfig
@@ -172,4 +172,10 @@ config PCI_HISI
help
Say Y here if you want PCIe controller support on HiSilicon HIP05 SoC
+config PCIE_HOST_THUNDER_PEM
+ bool "Cavium Thunder PCIe controller to off-chip devices"
+ depends on PCI_HOST_GENERIC && ARM64
|| COMPILE_TEST ?
(or does the use of writeq get you? If so, maybe COMPILE_TEST && 64BIT)
Yes, we must use writeq in the driver, I will change it to
||(COMPILE_TEST && 64BIT)
Thanks,
David Daney
Will
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/