mpc85xx: Enable unique mode registers and dynamic ODT for DDR3

Added fsl_ddr_get_version() function to for DDR3 to poll DDRC IP version
(major, minor, errata) to determine if unique mode registers are available.
If true, always use unique mode registers. Dynamic ODT is enabled if needed.
The table is documented in doc/README.fsl-ddr. This function may also need
to be extend for future other platforms if such a feature exists.

Enable address parity and RCW by default for RDIMMs.

Change default output driver impedance from 34 ohm to 40ohm. Make it 34ohm for
quad-rank RDIMMs.

Use a formula to calculate rodt_on for timing_cfg_5.

Signed-off-by: York Sun <yorksun@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

1 files changed, 66 insertions, 1 deletions

diff --git a/doc/README.fsl-ddr b/doc/README.fsl-ddr
index 9e3c539..a7ba193 100644
--- a/doc/README.fsl-ddr
+++ b/doc/README.fsl-ddr
@@ -104,4 +104,69 @@ Combination of hwconfig
 Hwconfig can be combined with multiple parameters, for example, on a supported
 platform
 
-hwconfig=fsl_ddr:addr_hash=true,ctlr_intlv=cacheline,bank_intlv=cs0_cs1_cs2_cs3
+hwconfig=fsl_ddr:addr_hash=true,ctlr_intlv=cacheline,bank_intlv=cs0_cs1_cs2_cs3,ecc=on
+
+Table for dynamic ODT for DDR3
+==============================
+For single-slot system with quad-rank DIMM and dual-slot system, dynamic ODT may
+be needed, depending on the configuration. The numbers in the following tables are
+in Ohms.
+
+* denotes dynamic ODT
+
+Two slots system
++-----------------------+----------+---------------+-----------------------------+-----------------------------+
+|     Configuration     |          |DRAM controller|           Slot 1            |            Slot 2           |
++-----------+-----------+----------+-------+-------+--------------+--------------+--------------+--------------+
+|           |           |          |       |       |     Rank 1   |     Rank 2   |   Rank 1     |    Rank 2    |
++  Slot 1   |   Slot 2  |Write/Read| Write | Read  |-------+------+-------+------+-------+------+-------+------+
+|           |           |          |       |       | Write | Read | Write | Read | Write | Read | Write | Read |
++-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
+|           |           |  Slot 1  |  off  | 75    | 120   | off  | off   | off  | off   | off  | 30    | 30   |
+| Dual Rank | Dual Rank |----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
+|           |           |  Slot 2  |  off  | 75    | off   | off  | 30    | 30   | 120   | off  | off   | off  |
++-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
+|           |           |  Slot 1  |  off  | 75    | 120   | off  | off   | off  | 20    | 20   |       |      |
+| Dual Rank |Single Rank|----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
+|           |           |  Slot 2  |  off  | 75    | off   | off  | 20    | 20   | 120  *| off  |       |      |
++-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
+|           |           |  Slot 1  |  off  | 75    | 120  *| off  |       |      | off   | off  | 20    | 20   |
+|Single Rank| Dual Rank |----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
+|           |           |  Slot 2  |  off  | 75    | 20    | 20   |       |      | 120   | off  | off   | off  |
++-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
+|           |           |  Slot 1  |  off  | 75    | 120  *| off  |       |      | 30    | 30   |       |      |
+|Single Rank|Single Rank|----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
+|           |           |  Slot 2  |  off  | 75    | 30    | 30   |       |      | 120  *| off  |       |      |
++-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
+| Dual Rank |   Empty   |  Slot 1  |  off  | 75    | 40    | off  | off   | off  |       |      |       |      |
++-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
+|   Empty   | Dual Rank |  Slot 2  |  off  | 75    |       |      |       |      | 40    | off  | off   | off  |
++-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
+|Single Rank|   Empty   |  Slot 1  |  off  | 75    | 40    | off  |       |      |       |      |       |      |
++-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
+|   Empty   |Single Rank|  Slot 2  |  off  | 75    |       |      |       |      | 40    | off  |       |      |
++-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
+
+Single slot system
++-------------+------------+---------------+-----------------------------+-----------------------------+
+|             |            |DRAM controller|     Rank 1   |    Rank 2    |    Rank 3    |    Rank 4    |
+|Configuration| Write/Read |-------+-------+-------+------+-------+------+-------+------+-------+------+
+|             |            | Write | Read  | Write | Read | Write | Read | Write | Read | Write | Read |
++-------------+------------+-------+-------+-------+------+-------+------+-------+------+-------+------+
+|             |   R1       | off   | 75    | 120  *| off  | off   | off  | 20    | 20   | off   | off  |
+|             |------------+-------+-------+-------+------+-------+------+-------+------+-------+------+
+|             |   R2       | off   | 75    | off   | 20   | 120   | off  | 20    | 20   | off   | off  |
+|  Quad Rank  |------------+-------+-------+-------+------+-------+------+-------+------+-------+------+
+|             |   R3       | off   | 75    | 20    | 20   | off   | off  | 120  *| off  | off   | off  |
+|             |------------+-------+-------+-------+------+-------+------+-------+------+-------+------+
+|             |   R4       | off   | 75    | 20    | 20   | off   | off  | off   | 20   | 120   | off  |
++-------------+------------+-------+-------+-------+------+-------+------+-------+------+-------+------+
+|             |   R1       | off   | 75    | 40    | off  | off   | off  |
+|  Dual Rank  |------------+-------+-------+-------+------+-------+------+
+|             |   R2       | off   | 75    | 40    | off  | off   | off  |
++-------------+------------+-------+-------+-------+------+-------+------+
+| Single Rank |   R1       | off   | 75    | 40    | off  |
++-------------+------------+-------+-------+-------+------+
+
+Reference http://www.xrosstalkmag.com/mag_issues/xrosstalk_oct08_final.pdf
+          http://download.micron.com/pdf/technotes/ddr3/tn4108_ddr3_design_guide.pdf