xref: /OK3568_Linux_fs/kernel/Documentation/devicetree/bindings/pci/nvidia,tegra194-pcie.txt (revision 4882a59341e53eb6f0b4789bf948001014eff981)

NVIDIA Tegra PCIe controller (Synopsys DesignWare Core based)

This PCIe controller is based on the Synopsis Designware PCIe IP
and thus inherits all the common properties defined in designware-pcie.txt.
Some of the controller instances are dual mode where in they can work either
in root port mode or endpoint mode but one at a time.

Required properties:
- power-domains: A phandle to the node that controls power to the respective
  PCIe controller and a specifier name for the PCIe controller. Following are
  the specifiers for the different PCIe controllers
    TEGRA194_POWER_DOMAIN_PCIEX8B: C0
    TEGRA194_POWER_DOMAIN_PCIEX1A: C1
    TEGRA194_POWER_DOMAIN_PCIEX1A: C2
    TEGRA194_POWER_DOMAIN_PCIEX1A: C3
    TEGRA194_POWER_DOMAIN_PCIEX4A: C4
    TEGRA194_POWER_DOMAIN_PCIEX8A: C5
  these specifiers are defined in
  "include/dt-bindings/power/tegra194-powergate.h" file.
- reg: A list of physical base address and length pairs 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
  "config": As per the definition in designware-pcie.txt
  "atu_dma": iATU and DMA registers. This is where the iATU (internal Address
             Translation Unit) registers of the PCIe core are made available
             for SW access.
  "dbi": The aperture where root port's own configuration registers are
         available
- 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
- 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
- resets: Must contain an entry for each entry in reset-names.
  See ../reset/reset.txt for details.
- reset-names: Must include the following entries:
  - apb
  - core
- phys: Must contain a phandle to P2U PHY for each entry in phy-names.
- phy-names: Must include an entry for each active lane.
  "p2u-N": where N ranges from 0 to one less than the total number of lanes
- nvidia,bpmp: Must contain a pair of phandle to BPMP controller node followed
  by controller-id. Following are the controller ids for each controller.
    0: C0
    1: C1
    2: C2
    3: C3
    4: C4
    5: C5
- vddio-pex-ctl-supply: Regulator supply for PCIe side band signals

RC mode:
- compatible: Tegra19x must contain  "nvidia,tegra194-pcie"
- device_type: Must be "pci" for RC mode
- interrupt-names: Must include the following entries:
  "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.

EP mode:
In Tegra194, Only controllers C0, C4 & C5 support EP mode.
- compatible: Tegra19x must contain "nvidia,tegra194-pcie-ep"
- reg-names: Must include the following entries:
  "addr_space": Used to map remote RC address space
- reset-gpios: Must contain a phandle to a GPIO controller followed by
  GPIO that is being used as PERST input signal. Please refer to pci.txt
  document.

Optional properties:
- pinctrl-names: A list of pinctrl state names.
  It is mandatory for C5 controller and optional for other controllers.
  - "default": Configures PCIe I/O for proper operation.
- pinctrl-0: phandle for the 'default' state of pin configuration.
  It is mandatory for C5 controller and optional for other controllers.
- supports-clkreq: Refer to Documentation/devicetree/bindings/pci/pci.txt
- nvidia,update-fc-fixup: This is a boolean property and needs to be present to
    improve performance when a platform is designed in such a way that it
    satisfies at least one of the following conditions thereby enabling root
    port to exchange optimum number of FC (Flow Control) credits with
    downstream devices
    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,aspm-cmrt-us: Common Mode Restore Time for proper operation of ASPM
   to be specified in microseconds
- nvidia,aspm-pwr-on-t-us: Power On time for proper operation of ASPM to be
   specified in microseconds
- nvidia,aspm-l0s-entrance-latency-us: ASPM L0s entrance latency to be
   specified in microseconds

RC mode:
- vpcie3v3-supply: A phandle to the regulator node that supplies 3.3V to the slot
  if the platform has one such slot. (Ex:- x16 slot owned by C5 controller
  in p2972-0000 platform).
- vpcie12v-supply: A phandle to the regulator node that supplies 12V to the slot
  if the platform has one such slot. (Ex:- x16 slot owned by C5 controller
  in p2972-0000 platform).

EP mode:
- nvidia,refclk-select-gpios: Must contain a phandle to a GPIO controller
  followed by GPIO that is being used to enable REFCLK to controller from host

NOTE:- On Tegra194's P2972-0000 platform, only C5 controller can be enabled to
operate in the endpoint mode because of the way the platform is designed.

Examples:
=========

Tegra194 RC mode:
-----------------

	pcie@14180000 {
		compatible = "nvidia,tegra194-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";

		#address-cells = <3>;
		#size-cells = <2>;
		device_type = "pci";
		num-lanes = <8>;
		linux,pci-domain = <0>;

		pinctrl-names = "default";
		pinctrl-0 = <&pex_rst_c5_out_state>, <&clkreq_c5_bi_dir_state>;

		clocks = <&bpmp TEGRA194_CLK_PEX0_CORE_0>;
		clock-names = "core";

		resets = <&bpmp TEGRA194_RESET_PEX0_CORE_0_APB>,
			 <&bpmp TEGRA194_RESET_PEX0_CORE_0>;
		reset-names = "apb", "core";

		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 GIC_SPI 72 IRQ_TYPE_LEVEL_HIGH>;

		nvidia,bpmp = <&bpmp 0>;

		supports-clkreq;
		nvidia,aspm-cmrt-us = <60>;
		nvidia,aspm-pwr-on-t-us = <20>;
		nvidia,aspm-l0s-entrance-latency-us = <3>;

		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) */

		vddio-pex-ctl-supply = <&vdd_1v8ao>;
		vpcie3v3-supply = <&vdd_3v3_pcie>;
		vpcie12v-supply = <&vdd_12v_pcie>;

		phys = <&p2u_hsio_2>, <&p2u_hsio_3>, <&p2u_hsio_4>,
		       <&p2u_hsio_5>;
		phy-names = "p2u-0", "p2u-1", "p2u-2", "p2u-3";
	};

Tegra194 EP mode:
-----------------

	pcie_ep@141a0000 {
		compatible = "nvidia,tegra194-pcie-ep", "snps,dw-pcie-ep";
		power-domains = <&bpmp TEGRA194_POWER_DOMAIN_PCIEX8A>;
		reg = <0x00 0x141a0000 0x0 0x00020000   /* appl registers (128K)      */
		       0x00 0x3a040000 0x0 0x00040000   /* iATU_DMA reg space (256K)  */
		       0x00 0x3a080000 0x0 0x00040000   /* DBI reg space (256K)       */
		       0x1c 0x00000000 0x4 0x00000000>; /* Address Space (16G)        */
		reg-names = "appl", "atu_dma", "dbi", "addr_space";

		num-lanes = <8>;
		num-ib-windows = <2>;
		num-ob-windows = <8>;

		pinctrl-names = "default";
		pinctrl-0 = <&clkreq_c5_bi_dir_state>;

		clocks = <&bpmp TEGRA194_CLK_PEX1_CORE_5>;
		clock-names = "core";

		resets = <&bpmp TEGRA194_RESET_PEX1_CORE_5_APB>,
			 <&bpmp TEGRA194_RESET_PEX1_CORE_5>;
		reset-names = "apb", "core";

		interrupts = <GIC_SPI 53 IRQ_TYPE_LEVEL_HIGH>;	/* controller interrupt */
		interrupt-names = "intr";

		nvidia,bpmp = <&bpmp 5>;

		nvidia,aspm-cmrt-us = <60>;
		nvidia,aspm-pwr-on-t-us = <20>;
		nvidia,aspm-l0s-entrance-latency-us = <3>;

		vddio-pex-ctl-supply = <&vdd_1v8ao>;

		reset-gpios = <&gpio TEGRA194_MAIN_GPIO(GG, 1) GPIO_ACTIVE_LOW>;

		nvidia,refclk-select-gpios = <&gpio_aon TEGRA194_AON_GPIO(AA, 5)
					      GPIO_ACTIVE_HIGH>;

		phys = <&p2u_nvhs_0>, <&p2u_nvhs_1>, <&p2u_nvhs_2>,
		       <&p2u_nvhs_3>, <&p2u_nvhs_4>, <&p2u_nvhs_5>,
		       <&p2u_nvhs_6>, <&p2u_nvhs_7>;

		phy-names = "p2u-0", "p2u-1", "p2u-2", "p2u-3", "p2u-4",
			    "p2u-5", "p2u-6", "p2u-7";
	};