powerpc/t4qds: Add T4QDS board

The T4240QDS is a high-performance computing evaluation, development and
test platform supporting the T4240 QorIQ Power Architecture™ processor.

SERDES Connections
  32 lanes grouped into four 8-lane banks
  Two “front side” banks dedicated to Ethernet
  Two “back side” banks dedicated to other protocols
DDR Controllers
  Three independant 64-bit DDR3 controllers
  Supports rates up to 2133 MHz data-rate
  Supports two DDR3/DDR3LP UDIMM/RDIMMs per controller
QIXIS System Logic FPGA

Each DDR controller has two DIMM slots. The first slot of each controller
has up to 4 chip selects to support single-, dual- and quad-rank DIMMs.
The second slot has only 2 chip selects to support single- and dual-rank
DIMMs. At any given time, up to total 4 chip selects can be used.

Detail information can be found in doc/README.t4qds

Signed-off-by: York Sun <yorksun@freescale.com>
Signed-off-by: Andy Fleming <afleming@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Prabhakar Kushwaha <prabhakar@freescale.com>
Signed-off-by: Shengzhou Liu <Shengzhou.Liu@freescale.com>
Signed-off-by: Roy Zang <tie-fei.zang@freescale.com>
Signed-off-by: Andy Fleming <afleming@freescale.com>

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+Overview
+--------
+The T4240QDS is a high-performance computing evaluation, development and test
+platform supporting the T4240 QorIQ™ Power Architecture™ processor. T4240QDS is
+optimized to support the high-bandwidth DDR3 memory ports, as well as the
+highly-configurable SerDes ports. The system is lead-free and RoHS-compliant.
+
+Board Features
+  SERDES Connections
+	32 lanes grouped into four 8-lane banks
+	Two “front side” banks dedicated to Ethernet
+		- High-speed crosspoint switch fabric on selected lanes
+		- Two PCI Express slots with side-band connector supporting
+		- SGMII
+		- XAUI
+		- HiGig
+		- I-pass connectors allow board-to-board and loopback support
+	Two “back side” banks dedicated to other protocols
+		- High-speed crosspoint switch fabric on all lanes
+		- Four PCI Express slots with side-band connector supporting
+		- PCI Express 3.0
+		- SATA 2.0
+		- SRIO 2.0
+		- Supports 4X Aurora debug with two connectors
+  DDR Controllers
+	Three independant 64-bit DDR3 controllers
+	Supports rates of 1866 up to 2133 MHz data-rate
+	Supports two DDR3/DDR3LP UDIMM/RDIMMs per controller
+	DDR power supplies 1.5V to all devices with automatic tracking of VTT.
+	Power software-switchable to 1.35V if software detects all DDR3LP devices.
+	MT9JSF25672AZ-2G1KZESZF has been tested at 1333, 1600, 1867, 2000 and
+	2133MT/s speeds. For 1867MT/s and above, read-to-write turnaround time
+	increases by 1 clock.
+
+  IFC/Local Bus
+	NAND flash: 8-bit, async or sync, up to 2GB.
+	NOR: 16-bit, Address/Data Multiplexed (ADM), up to 128 MB
+	NOR: 8-bit or 16-bit, non-multiplexed, up to 512MB
+		- NOR devices support 16 virtual banks
+	GASIC: Minimal target within Qixis FPGA
+	PromJET rapid memory download support
+	Address demultiplexing handled within FPGA.
+		- Flexible demux allows 8 or 16 bit evaluation.
+	IFC Debug/Development card
+		- Support for 32-bit devices
+  Ethernet
+	Support two on-board RGMII 10/100/1G ethernet ports.
+	SGMII and XAUI support via SERDES block (see above).
+	1588 support via Symmetricom board.
+  QIXIS System Logic FPGA
+	Manages system power and reset sequencing
+	Manages DUT, board, clock, etc. configuration for dynamic shmoo
+	Collects V-I-T data in background for code/power profiling.
+	Supports legacy TMT test features (POSt, IRS, SYSCLK-synchronous assertion)
+	General fault monitoring and logging
+	Runs from ATX “hot” power rails allowing operation while system is off.
+  Clocks
+	System and DDR clock (SYSCLK, “DDRCLK”)
+		- Switch selectable to one of 16 common settings in the interval 33MHz-166MHz.
+		- Software selectable in 1MHz increments from 1-200MHz.
+	SERDES clocks
+		- Provides clocks to all SerDes blocks and slots
+		- 100, 125 and 156.25 MHz
+  Power Supplies
+	Dedicated regulators for VDD
+		- Adjustable from (0.7V to 1.3V at 80A
+		- Regulators can be controlled by VID and/or software
+	Dedicated regulator for GVDD_PL: 1.35/1.5V at 22A
+		- VTT/MVREF automatically track operating voltage
+	Dedicated regulators/filters for AVDD supplies
+	Dedicated regulators for other supplies: OVDD, BVDD, DVDD, LVDD, POVDD, etc.
+  USB
+	Supports two USB 2.0 ports with integrated PHYs
+		- One type A, one type micro-AB with 1.0A power per port.
+  Other IO
+	eSDHC/MMC
+		- SDHC card slot
+	eSPI port
+		- High-speed serial flash
+	Two Serial port
+	Four I2C ports
+
+Memory map
+----------
+The addresses in brackets are physical addresses.
+
+0x0_0000_0000 (0x0_0000_0000) - 0x0_7fff_ffff   2GB DDR (more than 2GB is initialized but not mapped under with TLB)
+0x0_8000_0000 (0xc_0000_0000) - 0x0_dfff_ffff 1.5GB PCIE memory
+0x0_f000_0000 (0xf_0000_0000) - 0x0_f03f_ffff  4MB  DCSR
+0x0_f400_0000 (0xf_f400_0000) - 0x0_f5ff_ffff  32MB BMan
+0x0_f600_0000 (0xf_f600_0000) - 0x0_f7ff_ffff  32MB QMan
+0x0_f800_0000 (0xf_f800_0000) - 0x0_f803_ffff 256KB PCIE IO
+0x0_e000_0000 (0xf_e000_0000) - 0x0_efff_ffff 256MB NOR flash
+0x0_fe00_0000 (0xf_fe00_0000) - 0x0_feff_ffff  16MB CCSR
+0x0_ffdf_0000 (0xf_ffdf_0000) - 0x0_ffdf_03ff   4KB QIXIS
+0x0_ffff_f000 (0x0_7fff_fff0) - 0x0_ffff_ffff   4KB Boot page translation for secondary cores
+
+The physical address of the last (boot page translation) varies with the actual DDR size.