[PATCH 05/10] dt-bindings: PCI: tegra: Add device tree support for T194

Vidya Sagar
2019-03-26T15:15:20Z

Add support for Tegra194 PCIe controllers. These controllers are based
on Synopsys DesignWare core IP.

Signed-off-by: Vidya Sagar <vidyas@nvidia.com>
---
.../bindings/pci/nvidia,tegra194-pcie.txt | 209 +++++++++++++++++++++
.../devicetree/bindings/phy/phy-tegra194-p2u.txt | 34 ++++
2 files changed, 243 insertions(+)
create mode 100644 Documentation/devicetree/bindings/pci/nvidia,tegra194-pcie.txt
create mode 100644 Documentation/devicetree/bindings/phy/phy-tegra194-p2u.txt

diff --git a/Documentation/devicetree/bindings/pci/nvidia,tegra194-pcie.txt b/Documentation/devicetree/bindings/pci/nvidia,tegra194-pcie.txt
new file mode 100644
index 000000000000..31527283a0cd
--- /dev/null
+++ b/Documentation/devicetree/bindings/pci/nvidia,tegra194-pcie.txt
@@ -0,0 +1,209 @@
+NVIDIA Tegra PCIe controller (Synopsys DesignWare Core based)
+
+This PCIe host controller is based on the Synopsis Designware PCIe IP
+and thus inherits all the common properties defined in designware-pcie.txt.
+
+Required properties:
+- compatible: For Tegra19x, must contain "nvidia,tegra194-pcie".
+- device_type: Must be "pci"
+- reg: A list of physical base address and length for each set of controller
+ registers. Must contain an entry for each entry in the reg-names property.
+- reg-names: Must include the following entries:
+ "appl": Controller's application logic registers
+ "window1": This is the aperture of controller available under 4GB boundary
+ (i.e. within 32-bit space). This aperture is typically used for
+ accessing config space of root port itself and also the connected
+ endpoints (by appropriately programming internal Address
+ Translation Unit's (iATU) out bound region) and also to map
+ prefetchable/non-prefetchable BARs.
+ "config": As per the definition in designware-pcie.txt
+ "atu_dma": iATU and DMA register. This is where the iATU (internal Address
+ Translation Unit) registers of the PCIe core are made available
+ fow SW access.
+ "dbi": The aperture where root port's own configuration registers are
+ available
+ "window2": This is the larger (compared to window1) aperture available above
+ 4GB boundary (i.e. in 64-bit space). This is typically used for
+ mapping prefetchable/non-prefetchable BARs of endpoints
+- interrupts: A list of interrupt outputs of the controller. Must contain an
+ entry for each entry in the interrupt-names property.
+- interrupt-names: Must include the following entries:
+ "intr": The Tegra interrupt that is asserted for controller interrupts
+ "msi": The Tegra interrupt that is asserted when an MSI is received
+- bus-range: Range of bus numbers associated with this controller
+- #address-cells: Address representation for root ports (must be 3)
+ - cell 0 specifies the bus and device numbers of the root port:
+ [23:16]: bus number
+ [15:11]: device number
+ - cell 1 denotes the upper 32 address bits and should be 0
+ - cell 2 contains the lower 32 address bits and is used to translate to the
+ CPU address space
+- #size-cells: Size representation for root ports (must be 2)
+- ranges: Describes the translation of addresses for root ports and standard
+ PCI regions. The entries must be 7 cells each, where the first three cells
+ correspond to the address as described for the #address-cells property
+ above, the fourth and fifth cells are for the physical CPU address to
+ translate to and the sixth and seventh cells are as described for the
+ #size-cells property above.
+ - Entries setup the mapping for the standard I/O, memory and
+ prefetchable PCI regions. The first cell determines the type of region
+ that is setup:
+ - 0x81000000: I/O memory region
+ - 0x82000000: non-prefetchable memory region
+ - 0xc2000000: prefetchable memory region
+ Please refer to the standard PCI bus binding document for a more detailed
+ explanation.
+- #interrupt-cells: Size representation for interrupts (must be 1)
+- interrupt-map-mask and interrupt-map: Standard PCI IRQ mapping properties
+ Please refer to the standard PCI bus binding document for a more detailed
+ explanation.
+- clocks: Must contain an entry for each entry in clock-names.
+ See ../clocks/clock-bindings.txt for details.
+- clock-names: Must include the following entries:
+ - core_clk
+- resets: Must contain an entry for each entry in reset-names.
+ See ../reset/reset.txt for details.
+- reset-names: Must include the following entries:
+ - core_apb_rst
+ - core_rst
+- phys: Must contain a phandle to P2U PHY for each entry in phy-names.
+- phy-names: Must include an entry for each active lane.
+ "pcie-p2u-N": where N ranges from 0 to one less than the total number of lanes
+- Controller dependent register offsets
+ - nvidia,event-cntr-ctrl: EVENT_COUNTER_CONTROL reg offset
+ 0x168 - FPGA
+ 0x1a8 - C1, C2 and C3
+ 0x1c4 - C4
+ 0x1d8 - C0 and C5
+ - nvidia,event-cntr-data: EVENT_COUNTER_DATA reg offset
+ 0x16c - FPGA
+ 0x1ac - C1, C2 and C3
+ 0x1c8 - C4
+ 0x1dc - C0 and C5
+- nvidia,controller-id : Controller specific ID
+ 0x0 - C0
+ 0x1 - C1
+ 0x2 - C2
+ 0x3 - C3
+ 0x4 - C4
+ 0x5 - C5
+- vddio-pex-ctl-supply: Regulator supply for PCIe side band signals
+
+Optional properties:
+- nvidia,max-speed: limits controllers max speed to this value.
+ 1 - Gen-1 (2.5 GT/s)
+ 2 - Gen-2 (5 GT/s)
+ 3 - Gen-3 (8 GT/s)
+ 4 - Gen-4 (16 GT/s)
+- nvidia,init-speed: limits controllers init speed to this value.
+ 1 - Gen-1 (2. 5 GT/s)
+ 2 - Gen-2 (5 GT/s)
+ 3 - Gen-3 (8 GT/s)
+ 4 - Gen-4 (16 GT/s)
+- nvidia,disable-aspm-states : controls advertisement of ASPM states
+ bit-0 to '1' : disables advertisement of ASPM-L0s
+ bit-1 to '1' : disables advertisement of ASPM-L1. This also disables
+ advertisement of ASPM-L1.1 and ASPM-L1.2
+ bit-2 to '1' : disables advertisement of ASPM-L1.1
+ bit-3 to '1' : disables advertisement of ASPM-L1.2
+- nvidia,disable-clock-request : gives a hint to driver that there is no
+ CLKREQ signal routing on board
+- nvidia,update-fc-fixup : needs it to improve perf when a platform is designed
+ in such a way that it satisfies at least one of the following conditions
+ 1. If C0/C4/C5 run at x1/x2 link widths (irrespective of speed and MPS)
+ 2. If C0/C1/C2/C3/C4/C5 operate at their respective max link widths and
+ a) speed is Gen-2 and MPS is 256B
+ b) speed is >= Gen-3 with any MPS
+- nvidia,cdm-check : Enables CDM checking. For more information, refer Synopsis
+ DesignWare Cores PCI Express Controller Databook r4.90a Chapter S.4
+- nvidia,enable-power-down : Enables power down of respective controller and
+ corresponding PLLs if they are not shared by any other entity
+- "nvidia,pex-wake" : Add PEX_WAKE gpio number to provide wake support.
+- "nvidia,plat-gpios" : Add gpio number that needs to be configured before
+ system goes for enumeration. There could be platforms where enabling 3.3V and
+ 12V power supplies are done through GPIOs, in which case, list of all such
+ GPIOs can be specified through this property.
+- "nvidia,aspm-cmrt" : Common Mode Restore time for proper operation of ASPM to
+ be specified in microseconds
+- "nvidia,aspm-pwr-on-t" : Power On time for proper operation of ASPM to be
+ specified in microseconds
+- "nvidia,aspm-l0s-entrance-latency" : ASPM L0s entrance latency to be specified
+ in microseconds
+
+Examples:
+=========
+
+Tegra194:
+--------
+
+SoC DTSI:
+
+ pcie@14180000 {
+ compatible = "nvidia,tegra194-pcie", "snps,dw-pcie";
+ power-domains = <&bpmp TEGRA194_POWER_DOMAIN_PCIEX8B>;
+ reg = <0x00 0x14180000 0x0 0x00020000 /* appl registers (128K) */
+ 0x00 0x38000000 0x0 0x00040000 /* configuration space (256K) */
+ 0x00 0x38040000 0x0 0x00040000>; /* iATU_DMA reg space (256K) */
+ reg-names = "appl", "config", "atu_dma";
+
+ status = "disabled";
+
+ #address-cells = <3>;
+ #size-cells = <2>;
+ device_type = "pci";
+ num-lanes = <8>;
+ linux,pci-domain = <0>;
+
+ clocks = <&bpmp TEGRA194_CLK_PEX0_CORE_0>;
+ clock-names = "core_clk";
+
+ resets = <&bpmp TEGRA194_RESET_PEX0_CORE_0_APB>,
+ <&bpmp TEGRA194_RESET_PEX0_CORE_0>;
+ reset-names = "core_apb_rst", "core_rst";
+
+ interrupts = <GIC_SPI 72 IRQ_TYPE_LEVEL_HIGH>, /* controller interrupt */
+ <GIC_SPI 73 IRQ_TYPE_LEVEL_HIGH>; /* MSI interrupt */
+ interrupt-names = "intr", "msi";
+
+ #interrupt-cells = <1>;
+ interrupt-map-mask = <0 0 0 0>;
+ interrupt-map = <0 0 0 0 &gic 0 72 0x04>;
+
+ nvidia,bpmp = <&bpmp>;
+
+ nvidia,max-speed = <4>;
+ nvidia,disable-aspm-states = <0xf>;
+ nvidia,controller-id = <&bpmp 0x0>;
+ nvidia,aux-clk-freq = <0x13>;
+ nvidia,preset-init = <0x5>;
+ nvidia,aspm-cmrt = <0x3C>;
+ nvidia,aspm-pwr-on-t = <0x14>;
+ nvidia,aspm-l0s-entrance-latency = <0x3>;
+
+ bus-range = <0x0 0xff>;
+ ranges = <0x81000000 0x0 0x38100000 0x0 0x38100000 0x0 0x00100000 /* downstream I/O (1MB) */
+ 0x82000000 0x0 0x38200000 0x0 0x38200000 0x0 0x01E00000 /* non-prefetchable memory (30MB) */
+ 0xc2000000 0x18 0x00000000 0x18 0x00000000 0x4 0x00000000>; /* prefetchable memory (16GB) */
+
+ nvidia,cfg-link-cap-l1sub = <0x1c4>;
+ nvidia,cap-pl16g-status = <0x174>;
+ nvidia,cap-pl16g-cap-off = <0x188>;
+ nvidia,event-cntr-ctrl = <0x1d8>;
+ nvidia,event-cntr-data = <0x1dc>;
+ nvidia,dl-feature-cap = <0x30c>;
+ };
+
+Board DTS:
+
+ pcie@14180000 {
+ status = "okay";
+
+ vddio-pex-ctl-supply = <&vdd_1v8ao>;
+
+ phys = <&p2u_2>,
+ <&p2u_3>,
+ <&p2u_4>,
+ <&p2u_5>;
+ phy-names = "pcie-p2u-0", "pcie-p2u-1", "pcie-p2u-2",
+ "pcie-p2u-3";
+ };
diff --git a/Documentation/devicetree/bindings/phy/phy-tegra194-p2u.txt b/Documentation/devicetree/bindings/phy/phy-tegra194-p2u.txt
new file mode 100644
index 000000000000..cc0de8e8e8db
--- /dev/null
+++ b/Documentation/devicetree/bindings/phy/phy-tegra194-p2u.txt
@@ -0,0 +1,34 @@
+NVIDIA Tegra194 P2U binding
+
+Tegra194 has two PHY bricks namely HSIO (High Speed IO) and NVHS (NVIDIA High
+Speed) each interfacing with 12 and 8 P2U instances respectively.
+A P2U instance is a glue logic between Synopsys DesignWare Core PCIe IP's PIPE
+interface and PHY of HSIO/NVHS bricks. Each P2U instance represents one PCIe
+lane.
+
+Required properties:
+- compatible: For Tegra19x, must contain "nvidia,tegra194-phy-p2u".
+- reg: Should be the physical address space and length of respective each P2U
+ instance.
+- reg-names: Must include the entry "base".
+
+Required properties for PHY port node:
+- #phy-cells: Defined by generic PHY bindings. Must be 0.
+
+Refer to phy/phy-bindings.txt for the generic PHY binding properties.
+
+Example:
+
+hsio-p2u {
+ compatible = "simple-bus";
+ #address-cells = <2>;
+ #size-cells = <2>;
+ ranges;
+ p2u_0: p2u@03e10000 {
+ compatible = "nvidia,tegra194-phy-p2u";
+ reg = <0x0 0x03e10000 0x0 0x00010000>;
+ reg-names = "base";
+
+ #phy-cells = <0>;
+ };
+}
--
2.7.4