PCI: tegra: Move PCIe driver to drivers/pci/host

Move the PCIe driver from arch/arm/mach-tegra into the drivers/pci/host
directory. The motivation is to collect various host controller drivers
in the same location in order to facilitate refactoring.

The Tegra PCIe driver has been largely rewritten, both in order to turn
it into a proper platform driver and to add MSI (based on code by
Krishna Kishore <kthota@nvidia.com>) as well as device tree support.

Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
[swarren, split DT changes into a separate patch in another branch]
Signed-off-by: Stephen Warren <swarren@nvidia.com>

1 files changed, 161 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/pci/nvidia,tegra20-pcie.txt b/Documentation/devicetree/bindings/pci/nvidia,tegra20-pcie.txt
new file mode 100644
index 00000000000..90c112f671d
--- /dev/null
+++ b/Documentation/devicetree/bindings/pci/nvidia,tegra20-pcie.txt
@@ -0,0 +1,161 @@
+NVIDIA Tegra PCIe controller
+
+Required properties:
+- compatible: "nvidia,tegra20-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:
+  "pads": PADS registers
+  "afi": AFI registers
+  "cs": configuration space region
+- 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
+- pex-clk-supply: Supply voltage for internal reference clock
+- vdd-supply: Power supply for controller (1.05V)
+- 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 6 cells each, where the first three cells
+  correspond to the address as described for the #address-cells property
+  above, the fourth cell is the physical CPU address to translate to and the
+  fifth and six cells are as described for the #size-cells property above.
+  - The first two entries are expected to translate the addresses for the root
+    port registers, which are referenced by the assigned-addresses property of
+    the root port nodes (see below).
+  - The remaining 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.
+- clocks: List of clock inputs of the controller. Must contain an entry for
+  each entry in the clock-names property.
+- clock-names: Must include the following entries:
+  "pex": The Tegra clock of that name
+  "afi": The Tegra clock of that name
+  "pcie_xclk": The Tegra clock of that name
+  "pll_e": The Tegra clock of that name
+
+Root ports are defined as subnodes of the PCIe controller node.
+
+Required properties:
+- device_type: Must be "pci"
+- assigned-addresses: Address and size of the port configuration registers
+- reg: PCI bus address of the root port
+- #address-cells: Must be 3
+- #size-cells: Must be 2
+- ranges: Sub-ranges distributed from the PCIe controller node. An empty
+  property is sufficient.
+- nvidia,num-lanes: Number of lanes to use for this port. Valid combinations
+  are:
+  - Root port 0 uses 4 lanes, root port 1 is unused.
+  - Both root ports use 2 lanes.
+
+Example:
+
+SoC DTSI:
+
+	pcie-controller {
+		compatible = "nvidia,tegra20-pcie";
+		device_type = "pci";
+		reg = <0x80003000 0x00000800   /* PADS registers */
+		       0x80003800 0x00000200   /* AFI registers */
+		       0x90000000 0x10000000>; /* configuration space */
+		reg-names = "pads", "afi", "cs";
+		interrupts = <0 98 0x04   /* controller interrupt */
+		              0 99 0x04>; /* MSI interrupt */
+		interrupt-names = "intr", "msi";
+
+		bus-range = <0x00 0xff>;
+		#address-cells = <3>;
+		#size-cells = <2>;
+
+		ranges = <0x82000000 0 0x80000000 0x80000000 0 0x00001000   /* port 0 registers */
+			  0x82000000 0 0x80001000 0x80001000 0 0x00001000   /* port 1 registers */
+			  0x81000000 0 0          0x82000000 0 0x00010000   /* downstream I/O */
+			  0x82000000 0 0xa0000000 0xa0000000 0 0x10000000   /* non-prefetchable memory */
+			  0xc2000000 0 0xb0000000 0xb0000000 0 0x10000000>; /* prefetchable memory */
+
+		clocks = <&tegra_car 70>, <&tegra_car 72>, <&tegra_car 74>,
+			 <&tegra_car 118>;
+		clock-names = "pex", "afi", "pcie_xclk", "pll_e";
+		status = "disabled";
+
+		pci@1,0 {
+			device_type = "pci";
+			assigned-addresses = <0x82000800 0 0x80000000 0 0x1000>;
+			reg = <0x000800 0 0 0 0>;
+			status = "disabled";
+
+			#address-cells = <3>;
+			#size-cells = <2>;
+
+			ranges;
+
+			nvidia,num-lanes = <2>;
+		};
+
+		pci@2,0 {
+			device_type = "pci";
+			assigned-addresses = <0x82001000 0 0x80001000 0 0x1000>;
+			reg = <0x001000 0 0 0 0>;
+			status = "disabled";
+
+			#address-cells = <3>;
+			#size-cells = <2>;
+
+			ranges;
+
+			nvidia,num-lanes = <2>;
+		};
+	};
+
+
+Board DTS:
+
+	pcie-controller {
+		status = "okay";
+
+		vdd-supply = <&pci_vdd_reg>;
+		pex-clk-supply = <&pci_clk_reg>;
+
+		/* root port 00:01.0 */
+		pci@1,0 {
+			status = "okay";
+
+			/* bridge 01:00.0 (optional) */
+			pci@0,0 {
+				reg = <0x010000 0 0 0 0>;
+
+				#address-cells = <3>;
+				#size-cells = <2>;
+
+				device_type = "pci";
+
+				/* endpoint 02:00.0 */
+				pci@0,0 {
+					reg = <0x020000 0 0 0 0>;
+				};
+			};
+		};
+	};
+
+Note that devices on the PCI bus are dynamically discovered using PCI's bus
+enumeration and therefore don't need corresponding device nodes in DT. However
+if a device on the PCI bus provides a non-probeable bus such as I2C or SPI,
+device nodes need to be added in order to allow the bus' children to be
+instantiated at the proper location in the operating system's device tree (as
+illustrated by the optional nodes in the example above).